Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * NET3 Protocol independent device support routines. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Derived from the non IP parts of dev.c 1.0.19 | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
13 | * | |
14 | * Additional Authors: | |
15 | * Florian la Roche <rzsfl@rz.uni-sb.de> | |
16 | * Alan Cox <gw4pts@gw4pts.ampr.org> | |
17 | * David Hinds <dahinds@users.sourceforge.net> | |
18 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
19 | * Adam Sulmicki <adam@cfar.umd.edu> | |
20 | * Pekka Riikonen <priikone@poesidon.pspt.fi> | |
21 | * | |
22 | * Changes: | |
23 | * D.J. Barrow : Fixed bug where dev->refcnt gets set | |
24 | * to 2 if register_netdev gets called | |
25 | * before net_dev_init & also removed a | |
26 | * few lines of code in the process. | |
27 | * Alan Cox : device private ioctl copies fields back. | |
28 | * Alan Cox : Transmit queue code does relevant | |
29 | * stunts to keep the queue safe. | |
30 | * Alan Cox : Fixed double lock. | |
31 | * Alan Cox : Fixed promisc NULL pointer trap | |
32 | * ???????? : Support the full private ioctl range | |
33 | * Alan Cox : Moved ioctl permission check into | |
34 | * drivers | |
35 | * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI | |
36 | * Alan Cox : 100 backlog just doesn't cut it when | |
37 | * you start doing multicast video 8) | |
38 | * Alan Cox : Rewrote net_bh and list manager. | |
39 | * Alan Cox : Fix ETH_P_ALL echoback lengths. | |
40 | * Alan Cox : Took out transmit every packet pass | |
41 | * Saved a few bytes in the ioctl handler | |
42 | * Alan Cox : Network driver sets packet type before | |
43 | * calling netif_rx. Saves a function | |
44 | * call a packet. | |
45 | * Alan Cox : Hashed net_bh() | |
46 | * Richard Kooijman: Timestamp fixes. | |
47 | * Alan Cox : Wrong field in SIOCGIFDSTADDR | |
48 | * Alan Cox : Device lock protection. | |
49 | * Alan Cox : Fixed nasty side effect of device close | |
50 | * changes. | |
51 | * Rudi Cilibrasi : Pass the right thing to | |
52 | * set_mac_address() | |
53 | * Dave Miller : 32bit quantity for the device lock to | |
54 | * make it work out on a Sparc. | |
55 | * Bjorn Ekwall : Added KERNELD hack. | |
56 | * Alan Cox : Cleaned up the backlog initialise. | |
57 | * Craig Metz : SIOCGIFCONF fix if space for under | |
58 | * 1 device. | |
59 | * Thomas Bogendoerfer : Return ENODEV for dev_open, if there | |
60 | * is no device open function. | |
61 | * Andi Kleen : Fix error reporting for SIOCGIFCONF | |
62 | * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF | |
63 | * Cyrus Durgin : Cleaned for KMOD | |
64 | * Adam Sulmicki : Bug Fix : Network Device Unload | |
65 | * A network device unload needs to purge | |
66 | * the backlog queue. | |
67 | * Paul Rusty Russell : SIOCSIFNAME | |
68 | * Pekka Riikonen : Netdev boot-time settings code | |
69 | * Andrew Morton : Make unregister_netdevice wait | |
70 | * indefinitely on dev->refcnt | |
71 | * J Hadi Salim : - Backlog queue sampling | |
72 | * - netif_rx() feedback | |
73 | */ | |
74 | ||
75 | #include <asm/uaccess.h> | |
1da177e4 | 76 | #include <linux/bitops.h> |
4fc268d2 | 77 | #include <linux/capability.h> |
1da177e4 LT |
78 | #include <linux/cpu.h> |
79 | #include <linux/types.h> | |
80 | #include <linux/kernel.h> | |
08e9897d | 81 | #include <linux/hash.h> |
5a0e3ad6 | 82 | #include <linux/slab.h> |
1da177e4 | 83 | #include <linux/sched.h> |
4a3e2f71 | 84 | #include <linux/mutex.h> |
1da177e4 LT |
85 | #include <linux/string.h> |
86 | #include <linux/mm.h> | |
87 | #include <linux/socket.h> | |
88 | #include <linux/sockios.h> | |
89 | #include <linux/errno.h> | |
90 | #include <linux/interrupt.h> | |
91 | #include <linux/if_ether.h> | |
92 | #include <linux/netdevice.h> | |
93 | #include <linux/etherdevice.h> | |
0187bdfb | 94 | #include <linux/ethtool.h> |
1da177e4 LT |
95 | #include <linux/notifier.h> |
96 | #include <linux/skbuff.h> | |
457c4cbc | 97 | #include <net/net_namespace.h> |
1da177e4 LT |
98 | #include <net/sock.h> |
99 | #include <linux/rtnetlink.h> | |
1da177e4 | 100 | #include <linux/stat.h> |
1da177e4 LT |
101 | #include <net/dst.h> |
102 | #include <net/pkt_sched.h> | |
103 | #include <net/checksum.h> | |
44540960 | 104 | #include <net/xfrm.h> |
1da177e4 LT |
105 | #include <linux/highmem.h> |
106 | #include <linux/init.h> | |
1da177e4 | 107 | #include <linux/module.h> |
1da177e4 LT |
108 | #include <linux/netpoll.h> |
109 | #include <linux/rcupdate.h> | |
110 | #include <linux/delay.h> | |
1da177e4 | 111 | #include <net/iw_handler.h> |
1da177e4 | 112 | #include <asm/current.h> |
5bdb9886 | 113 | #include <linux/audit.h> |
db217334 | 114 | #include <linux/dmaengine.h> |
f6a78bfc | 115 | #include <linux/err.h> |
c7fa9d18 | 116 | #include <linux/ctype.h> |
723e98b7 | 117 | #include <linux/if_arp.h> |
6de329e2 | 118 | #include <linux/if_vlan.h> |
8f0f2223 | 119 | #include <linux/ip.h> |
ad55dcaf | 120 | #include <net/ip.h> |
25cd9ba0 | 121 | #include <net/mpls.h> |
8f0f2223 DM |
122 | #include <linux/ipv6.h> |
123 | #include <linux/in.h> | |
b6b2fed1 DM |
124 | #include <linux/jhash.h> |
125 | #include <linux/random.h> | |
9cbc1cb8 | 126 | #include <trace/events/napi.h> |
cf66ba58 | 127 | #include <trace/events/net.h> |
07dc22e7 | 128 | #include <trace/events/skb.h> |
5acbbd42 | 129 | #include <linux/pci.h> |
caeda9b9 | 130 | #include <linux/inetdevice.h> |
c445477d | 131 | #include <linux/cpu_rmap.h> |
c5905afb | 132 | #include <linux/static_key.h> |
af12fa6e | 133 | #include <linux/hashtable.h> |
60877a32 | 134 | #include <linux/vmalloc.h> |
529d0489 | 135 | #include <linux/if_macvlan.h> |
e7fd2885 | 136 | #include <linux/errqueue.h> |
3b47d303 | 137 | #include <linux/hrtimer.h> |
1da177e4 | 138 | |
342709ef PE |
139 | #include "net-sysfs.h" |
140 | ||
d565b0a1 HX |
141 | /* Instead of increasing this, you should create a hash table. */ |
142 | #define MAX_GRO_SKBS 8 | |
143 | ||
5d38a079 HX |
144 | /* This should be increased if a protocol with a bigger head is added. */ |
145 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
146 | ||
1da177e4 | 147 | static DEFINE_SPINLOCK(ptype_lock); |
62532da9 | 148 | static DEFINE_SPINLOCK(offload_lock); |
900ff8c6 CW |
149 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
150 | struct list_head ptype_all __read_mostly; /* Taps */ | |
62532da9 | 151 | static struct list_head offload_base __read_mostly; |
1da177e4 | 152 | |
ae78dbfa | 153 | static int netif_rx_internal(struct sk_buff *skb); |
54951194 LP |
154 | static int call_netdevice_notifiers_info(unsigned long val, |
155 | struct net_device *dev, | |
156 | struct netdev_notifier_info *info); | |
ae78dbfa | 157 | |
1da177e4 | 158 | /* |
7562f876 | 159 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
160 | * semaphore. |
161 | * | |
c6d14c84 | 162 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
163 | * |
164 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 165 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
166 | * actual updates. This allows pure readers to access the list even |
167 | * while a writer is preparing to update it. | |
168 | * | |
169 | * To put it another way, dev_base_lock is held for writing only to | |
170 | * protect against pure readers; the rtnl semaphore provides the | |
171 | * protection against other writers. | |
172 | * | |
173 | * See, for example usages, register_netdevice() and | |
174 | * unregister_netdevice(), which must be called with the rtnl | |
175 | * semaphore held. | |
176 | */ | |
1da177e4 | 177 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
178 | EXPORT_SYMBOL(dev_base_lock); |
179 | ||
af12fa6e ET |
180 | /* protects napi_hash addition/deletion and napi_gen_id */ |
181 | static DEFINE_SPINLOCK(napi_hash_lock); | |
182 | ||
183 | static unsigned int napi_gen_id; | |
184 | static DEFINE_HASHTABLE(napi_hash, 8); | |
185 | ||
18afa4b0 | 186 | static seqcount_t devnet_rename_seq; |
c91f6df2 | 187 | |
4e985ada TG |
188 | static inline void dev_base_seq_inc(struct net *net) |
189 | { | |
190 | while (++net->dev_base_seq == 0); | |
191 | } | |
192 | ||
881d966b | 193 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 194 | { |
95c96174 ED |
195 | unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
196 | ||
08e9897d | 197 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
198 | } |
199 | ||
881d966b | 200 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 201 | { |
7c28bd0b | 202 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
203 | } |
204 | ||
e36fa2f7 | 205 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
206 | { |
207 | #ifdef CONFIG_RPS | |
e36fa2f7 | 208 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
209 | #endif |
210 | } | |
211 | ||
e36fa2f7 | 212 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
213 | { |
214 | #ifdef CONFIG_RPS | |
e36fa2f7 | 215 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
216 | #endif |
217 | } | |
218 | ||
ce286d32 | 219 | /* Device list insertion */ |
53759be9 | 220 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 221 | { |
c346dca1 | 222 | struct net *net = dev_net(dev); |
ce286d32 EB |
223 | |
224 | ASSERT_RTNL(); | |
225 | ||
226 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 227 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
72c9528b | 228 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
fb699dfd ED |
229 | hlist_add_head_rcu(&dev->index_hlist, |
230 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 231 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
232 | |
233 | dev_base_seq_inc(net); | |
ce286d32 EB |
234 | } |
235 | ||
fb699dfd ED |
236 | /* Device list removal |
237 | * caller must respect a RCU grace period before freeing/reusing dev | |
238 | */ | |
ce286d32 EB |
239 | static void unlist_netdevice(struct net_device *dev) |
240 | { | |
241 | ASSERT_RTNL(); | |
242 | ||
243 | /* Unlink dev from the device chain */ | |
244 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 245 | list_del_rcu(&dev->dev_list); |
72c9528b | 246 | hlist_del_rcu(&dev->name_hlist); |
fb699dfd | 247 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 248 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
249 | |
250 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
251 | } |
252 | ||
1da177e4 LT |
253 | /* |
254 | * Our notifier list | |
255 | */ | |
256 | ||
f07d5b94 | 257 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
258 | |
259 | /* | |
260 | * Device drivers call our routines to queue packets here. We empty the | |
261 | * queue in the local softnet handler. | |
262 | */ | |
bea3348e | 263 | |
9958da05 | 264 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 265 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 266 | |
cf508b12 | 267 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 268 | /* |
c773e847 | 269 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
270 | * according to dev->type |
271 | */ | |
272 | static const unsigned short netdev_lock_type[] = | |
273 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
274 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
275 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
276 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
277 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
278 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
279 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
280 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
281 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
282 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
283 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
284 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
211ed865 PG |
285 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, |
286 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
287 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
723e98b7 | 288 | |
36cbd3dc | 289 | static const char *const netdev_lock_name[] = |
723e98b7 JP |
290 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
291 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
292 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
293 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
294 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
295 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
296 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
297 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
298 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
299 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
300 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
301 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
211ed865 PG |
302 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", |
303 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
304 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
723e98b7 JP |
305 | |
306 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 307 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
308 | |
309 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
310 | { | |
311 | int i; | |
312 | ||
313 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
314 | if (netdev_lock_type[i] == dev_type) | |
315 | return i; | |
316 | /* the last key is used by default */ | |
317 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
318 | } | |
319 | ||
cf508b12 DM |
320 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
321 | unsigned short dev_type) | |
723e98b7 JP |
322 | { |
323 | int i; | |
324 | ||
325 | i = netdev_lock_pos(dev_type); | |
326 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
327 | netdev_lock_name[i]); | |
328 | } | |
cf508b12 DM |
329 | |
330 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
331 | { | |
332 | int i; | |
333 | ||
334 | i = netdev_lock_pos(dev->type); | |
335 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
336 | &netdev_addr_lock_key[i], | |
337 | netdev_lock_name[i]); | |
338 | } | |
723e98b7 | 339 | #else |
cf508b12 DM |
340 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
341 | unsigned short dev_type) | |
342 | { | |
343 | } | |
344 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
345 | { |
346 | } | |
347 | #endif | |
1da177e4 LT |
348 | |
349 | /******************************************************************************* | |
350 | ||
351 | Protocol management and registration routines | |
352 | ||
353 | *******************************************************************************/ | |
354 | ||
1da177e4 LT |
355 | /* |
356 | * Add a protocol ID to the list. Now that the input handler is | |
357 | * smarter we can dispense with all the messy stuff that used to be | |
358 | * here. | |
359 | * | |
360 | * BEWARE!!! Protocol handlers, mangling input packets, | |
361 | * MUST BE last in hash buckets and checking protocol handlers | |
362 | * MUST start from promiscuous ptype_all chain in net_bh. | |
363 | * It is true now, do not change it. | |
364 | * Explanation follows: if protocol handler, mangling packet, will | |
365 | * be the first on list, it is not able to sense, that packet | |
366 | * is cloned and should be copied-on-write, so that it will | |
367 | * change it and subsequent readers will get broken packet. | |
368 | * --ANK (980803) | |
369 | */ | |
370 | ||
c07b68e8 ED |
371 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
372 | { | |
373 | if (pt->type == htons(ETH_P_ALL)) | |
7866a621 | 374 | return pt->dev ? &pt->dev->ptype_all : &ptype_all; |
c07b68e8 | 375 | else |
7866a621 SN |
376 | return pt->dev ? &pt->dev->ptype_specific : |
377 | &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
c07b68e8 ED |
378 | } |
379 | ||
1da177e4 LT |
380 | /** |
381 | * dev_add_pack - add packet handler | |
382 | * @pt: packet type declaration | |
383 | * | |
384 | * Add a protocol handler to the networking stack. The passed &packet_type | |
385 | * is linked into kernel lists and may not be freed until it has been | |
386 | * removed from the kernel lists. | |
387 | * | |
4ec93edb | 388 | * This call does not sleep therefore it can not |
1da177e4 LT |
389 | * guarantee all CPU's that are in middle of receiving packets |
390 | * will see the new packet type (until the next received packet). | |
391 | */ | |
392 | ||
393 | void dev_add_pack(struct packet_type *pt) | |
394 | { | |
c07b68e8 | 395 | struct list_head *head = ptype_head(pt); |
1da177e4 | 396 | |
c07b68e8 ED |
397 | spin_lock(&ptype_lock); |
398 | list_add_rcu(&pt->list, head); | |
399 | spin_unlock(&ptype_lock); | |
1da177e4 | 400 | } |
d1b19dff | 401 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 402 | |
1da177e4 LT |
403 | /** |
404 | * __dev_remove_pack - remove packet handler | |
405 | * @pt: packet type declaration | |
406 | * | |
407 | * Remove a protocol handler that was previously added to the kernel | |
408 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
409 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 410 | * returns. |
1da177e4 LT |
411 | * |
412 | * The packet type might still be in use by receivers | |
413 | * and must not be freed until after all the CPU's have gone | |
414 | * through a quiescent state. | |
415 | */ | |
416 | void __dev_remove_pack(struct packet_type *pt) | |
417 | { | |
c07b68e8 | 418 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
419 | struct packet_type *pt1; |
420 | ||
c07b68e8 | 421 | spin_lock(&ptype_lock); |
1da177e4 LT |
422 | |
423 | list_for_each_entry(pt1, head, list) { | |
424 | if (pt == pt1) { | |
425 | list_del_rcu(&pt->list); | |
426 | goto out; | |
427 | } | |
428 | } | |
429 | ||
7b6cd1ce | 430 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 431 | out: |
c07b68e8 | 432 | spin_unlock(&ptype_lock); |
1da177e4 | 433 | } |
d1b19dff ED |
434 | EXPORT_SYMBOL(__dev_remove_pack); |
435 | ||
1da177e4 LT |
436 | /** |
437 | * dev_remove_pack - remove packet handler | |
438 | * @pt: packet type declaration | |
439 | * | |
440 | * Remove a protocol handler that was previously added to the kernel | |
441 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
442 | * from the kernel lists and can be freed or reused once this function | |
443 | * returns. | |
444 | * | |
445 | * This call sleeps to guarantee that no CPU is looking at the packet | |
446 | * type after return. | |
447 | */ | |
448 | void dev_remove_pack(struct packet_type *pt) | |
449 | { | |
450 | __dev_remove_pack(pt); | |
4ec93edb | 451 | |
1da177e4 LT |
452 | synchronize_net(); |
453 | } | |
d1b19dff | 454 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 455 | |
62532da9 VY |
456 | |
457 | /** | |
458 | * dev_add_offload - register offload handlers | |
459 | * @po: protocol offload declaration | |
460 | * | |
461 | * Add protocol offload handlers to the networking stack. The passed | |
462 | * &proto_offload is linked into kernel lists and may not be freed until | |
463 | * it has been removed from the kernel lists. | |
464 | * | |
465 | * This call does not sleep therefore it can not | |
466 | * guarantee all CPU's that are in middle of receiving packets | |
467 | * will see the new offload handlers (until the next received packet). | |
468 | */ | |
469 | void dev_add_offload(struct packet_offload *po) | |
470 | { | |
471 | struct list_head *head = &offload_base; | |
472 | ||
473 | spin_lock(&offload_lock); | |
474 | list_add_rcu(&po->list, head); | |
475 | spin_unlock(&offload_lock); | |
476 | } | |
477 | EXPORT_SYMBOL(dev_add_offload); | |
478 | ||
479 | /** | |
480 | * __dev_remove_offload - remove offload handler | |
481 | * @po: packet offload declaration | |
482 | * | |
483 | * Remove a protocol offload handler that was previously added to the | |
484 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
485 | * is removed from the kernel lists and can be freed or reused once this | |
486 | * function returns. | |
487 | * | |
488 | * The packet type might still be in use by receivers | |
489 | * and must not be freed until after all the CPU's have gone | |
490 | * through a quiescent state. | |
491 | */ | |
1d143d9f | 492 | static void __dev_remove_offload(struct packet_offload *po) |
62532da9 VY |
493 | { |
494 | struct list_head *head = &offload_base; | |
495 | struct packet_offload *po1; | |
496 | ||
c53aa505 | 497 | spin_lock(&offload_lock); |
62532da9 VY |
498 | |
499 | list_for_each_entry(po1, head, list) { | |
500 | if (po == po1) { | |
501 | list_del_rcu(&po->list); | |
502 | goto out; | |
503 | } | |
504 | } | |
505 | ||
506 | pr_warn("dev_remove_offload: %p not found\n", po); | |
507 | out: | |
c53aa505 | 508 | spin_unlock(&offload_lock); |
62532da9 | 509 | } |
62532da9 VY |
510 | |
511 | /** | |
512 | * dev_remove_offload - remove packet offload handler | |
513 | * @po: packet offload declaration | |
514 | * | |
515 | * Remove a packet offload handler that was previously added to the kernel | |
516 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
517 | * removed from the kernel lists and can be freed or reused once this | |
518 | * function returns. | |
519 | * | |
520 | * This call sleeps to guarantee that no CPU is looking at the packet | |
521 | * type after return. | |
522 | */ | |
523 | void dev_remove_offload(struct packet_offload *po) | |
524 | { | |
525 | __dev_remove_offload(po); | |
526 | ||
527 | synchronize_net(); | |
528 | } | |
529 | EXPORT_SYMBOL(dev_remove_offload); | |
530 | ||
1da177e4 LT |
531 | /****************************************************************************** |
532 | ||
533 | Device Boot-time Settings Routines | |
534 | ||
535 | *******************************************************************************/ | |
536 | ||
537 | /* Boot time configuration table */ | |
538 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
539 | ||
540 | /** | |
541 | * netdev_boot_setup_add - add new setup entry | |
542 | * @name: name of the device | |
543 | * @map: configured settings for the device | |
544 | * | |
545 | * Adds new setup entry to the dev_boot_setup list. The function | |
546 | * returns 0 on error and 1 on success. This is a generic routine to | |
547 | * all netdevices. | |
548 | */ | |
549 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
550 | { | |
551 | struct netdev_boot_setup *s; | |
552 | int i; | |
553 | ||
554 | s = dev_boot_setup; | |
555 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
556 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
557 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 558 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
559 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
560 | break; | |
561 | } | |
562 | } | |
563 | ||
564 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
565 | } | |
566 | ||
567 | /** | |
568 | * netdev_boot_setup_check - check boot time settings | |
569 | * @dev: the netdevice | |
570 | * | |
571 | * Check boot time settings for the device. | |
572 | * The found settings are set for the device to be used | |
573 | * later in the device probing. | |
574 | * Returns 0 if no settings found, 1 if they are. | |
575 | */ | |
576 | int netdev_boot_setup_check(struct net_device *dev) | |
577 | { | |
578 | struct netdev_boot_setup *s = dev_boot_setup; | |
579 | int i; | |
580 | ||
581 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
582 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 583 | !strcmp(dev->name, s[i].name)) { |
1da177e4 LT |
584 | dev->irq = s[i].map.irq; |
585 | dev->base_addr = s[i].map.base_addr; | |
586 | dev->mem_start = s[i].map.mem_start; | |
587 | dev->mem_end = s[i].map.mem_end; | |
588 | return 1; | |
589 | } | |
590 | } | |
591 | return 0; | |
592 | } | |
d1b19dff | 593 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
594 | |
595 | ||
596 | /** | |
597 | * netdev_boot_base - get address from boot time settings | |
598 | * @prefix: prefix for network device | |
599 | * @unit: id for network device | |
600 | * | |
601 | * Check boot time settings for the base address of device. | |
602 | * The found settings are set for the device to be used | |
603 | * later in the device probing. | |
604 | * Returns 0 if no settings found. | |
605 | */ | |
606 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
607 | { | |
608 | const struct netdev_boot_setup *s = dev_boot_setup; | |
609 | char name[IFNAMSIZ]; | |
610 | int i; | |
611 | ||
612 | sprintf(name, "%s%d", prefix, unit); | |
613 | ||
614 | /* | |
615 | * If device already registered then return base of 1 | |
616 | * to indicate not to probe for this interface | |
617 | */ | |
881d966b | 618 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
619 | return 1; |
620 | ||
621 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
622 | if (!strcmp(name, s[i].name)) | |
623 | return s[i].map.base_addr; | |
624 | return 0; | |
625 | } | |
626 | ||
627 | /* | |
628 | * Saves at boot time configured settings for any netdevice. | |
629 | */ | |
630 | int __init netdev_boot_setup(char *str) | |
631 | { | |
632 | int ints[5]; | |
633 | struct ifmap map; | |
634 | ||
635 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
636 | if (!str || !*str) | |
637 | return 0; | |
638 | ||
639 | /* Save settings */ | |
640 | memset(&map, 0, sizeof(map)); | |
641 | if (ints[0] > 0) | |
642 | map.irq = ints[1]; | |
643 | if (ints[0] > 1) | |
644 | map.base_addr = ints[2]; | |
645 | if (ints[0] > 2) | |
646 | map.mem_start = ints[3]; | |
647 | if (ints[0] > 3) | |
648 | map.mem_end = ints[4]; | |
649 | ||
650 | /* Add new entry to the list */ | |
651 | return netdev_boot_setup_add(str, &map); | |
652 | } | |
653 | ||
654 | __setup("netdev=", netdev_boot_setup); | |
655 | ||
656 | /******************************************************************************* | |
657 | ||
658 | Device Interface Subroutines | |
659 | ||
660 | *******************************************************************************/ | |
661 | ||
a54acb3a ND |
662 | /** |
663 | * dev_get_iflink - get 'iflink' value of a interface | |
664 | * @dev: targeted interface | |
665 | * | |
666 | * Indicates the ifindex the interface is linked to. | |
667 | * Physical interfaces have the same 'ifindex' and 'iflink' values. | |
668 | */ | |
669 | ||
670 | int dev_get_iflink(const struct net_device *dev) | |
671 | { | |
672 | if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) | |
673 | return dev->netdev_ops->ndo_get_iflink(dev); | |
674 | ||
e1622baf ND |
675 | /* If dev->rtnl_link_ops is set, it's a virtual interface. */ |
676 | if (dev->rtnl_link_ops) | |
677 | return 0; | |
678 | ||
7a66bbc9 | 679 | return dev->ifindex; |
a54acb3a ND |
680 | } |
681 | EXPORT_SYMBOL(dev_get_iflink); | |
682 | ||
1da177e4 LT |
683 | /** |
684 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 685 | * @net: the applicable net namespace |
1da177e4 LT |
686 | * @name: name to find |
687 | * | |
688 | * Find an interface by name. Must be called under RTNL semaphore | |
689 | * or @dev_base_lock. If the name is found a pointer to the device | |
690 | * is returned. If the name is not found then %NULL is returned. The | |
691 | * reference counters are not incremented so the caller must be | |
692 | * careful with locks. | |
693 | */ | |
694 | ||
881d966b | 695 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 696 | { |
0bd8d536 ED |
697 | struct net_device *dev; |
698 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 699 | |
b67bfe0d | 700 | hlist_for_each_entry(dev, head, name_hlist) |
1da177e4 LT |
701 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
702 | return dev; | |
0bd8d536 | 703 | |
1da177e4 LT |
704 | return NULL; |
705 | } | |
d1b19dff | 706 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 707 | |
72c9528b ED |
708 | /** |
709 | * dev_get_by_name_rcu - find a device by its name | |
710 | * @net: the applicable net namespace | |
711 | * @name: name to find | |
712 | * | |
713 | * Find an interface by name. | |
714 | * If the name is found a pointer to the device is returned. | |
715 | * If the name is not found then %NULL is returned. | |
716 | * The reference counters are not incremented so the caller must be | |
717 | * careful with locks. The caller must hold RCU lock. | |
718 | */ | |
719 | ||
720 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
721 | { | |
72c9528b ED |
722 | struct net_device *dev; |
723 | struct hlist_head *head = dev_name_hash(net, name); | |
724 | ||
b67bfe0d | 725 | hlist_for_each_entry_rcu(dev, head, name_hlist) |
72c9528b ED |
726 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
727 | return dev; | |
728 | ||
729 | return NULL; | |
730 | } | |
731 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
732 | ||
1da177e4 LT |
733 | /** |
734 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 735 | * @net: the applicable net namespace |
1da177e4 LT |
736 | * @name: name to find |
737 | * | |
738 | * Find an interface by name. This can be called from any | |
739 | * context and does its own locking. The returned handle has | |
740 | * the usage count incremented and the caller must use dev_put() to | |
741 | * release it when it is no longer needed. %NULL is returned if no | |
742 | * matching device is found. | |
743 | */ | |
744 | ||
881d966b | 745 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
746 | { |
747 | struct net_device *dev; | |
748 | ||
72c9528b ED |
749 | rcu_read_lock(); |
750 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
751 | if (dev) |
752 | dev_hold(dev); | |
72c9528b | 753 | rcu_read_unlock(); |
1da177e4 LT |
754 | return dev; |
755 | } | |
d1b19dff | 756 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
757 | |
758 | /** | |
759 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 760 | * @net: the applicable net namespace |
1da177e4 LT |
761 | * @ifindex: index of device |
762 | * | |
763 | * Search for an interface by index. Returns %NULL if the device | |
764 | * is not found or a pointer to the device. The device has not | |
765 | * had its reference counter increased so the caller must be careful | |
766 | * about locking. The caller must hold either the RTNL semaphore | |
767 | * or @dev_base_lock. | |
768 | */ | |
769 | ||
881d966b | 770 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 771 | { |
0bd8d536 ED |
772 | struct net_device *dev; |
773 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 774 | |
b67bfe0d | 775 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
776 | if (dev->ifindex == ifindex) |
777 | return dev; | |
0bd8d536 | 778 | |
1da177e4 LT |
779 | return NULL; |
780 | } | |
d1b19dff | 781 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 782 | |
fb699dfd ED |
783 | /** |
784 | * dev_get_by_index_rcu - find a device by its ifindex | |
785 | * @net: the applicable net namespace | |
786 | * @ifindex: index of device | |
787 | * | |
788 | * Search for an interface by index. Returns %NULL if the device | |
789 | * is not found or a pointer to the device. The device has not | |
790 | * had its reference counter increased so the caller must be careful | |
791 | * about locking. The caller must hold RCU lock. | |
792 | */ | |
793 | ||
794 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
795 | { | |
fb699dfd ED |
796 | struct net_device *dev; |
797 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
798 | ||
b67bfe0d | 799 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
800 | if (dev->ifindex == ifindex) |
801 | return dev; | |
802 | ||
803 | return NULL; | |
804 | } | |
805 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
806 | ||
1da177e4 LT |
807 | |
808 | /** | |
809 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 810 | * @net: the applicable net namespace |
1da177e4 LT |
811 | * @ifindex: index of device |
812 | * | |
813 | * Search for an interface by index. Returns NULL if the device | |
814 | * is not found or a pointer to the device. The device returned has | |
815 | * had a reference added and the pointer is safe until the user calls | |
816 | * dev_put to indicate they have finished with it. | |
817 | */ | |
818 | ||
881d966b | 819 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
820 | { |
821 | struct net_device *dev; | |
822 | ||
fb699dfd ED |
823 | rcu_read_lock(); |
824 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
825 | if (dev) |
826 | dev_hold(dev); | |
fb699dfd | 827 | rcu_read_unlock(); |
1da177e4 LT |
828 | return dev; |
829 | } | |
d1b19dff | 830 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 831 | |
5dbe7c17 NS |
832 | /** |
833 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
834 | * @net: network namespace | |
835 | * @name: a pointer to the buffer where the name will be stored. | |
836 | * @ifindex: the ifindex of the interface to get the name from. | |
837 | * | |
838 | * The use of raw_seqcount_begin() and cond_resched() before | |
839 | * retrying is required as we want to give the writers a chance | |
840 | * to complete when CONFIG_PREEMPT is not set. | |
841 | */ | |
842 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
843 | { | |
844 | struct net_device *dev; | |
845 | unsigned int seq; | |
846 | ||
847 | retry: | |
848 | seq = raw_seqcount_begin(&devnet_rename_seq); | |
849 | rcu_read_lock(); | |
850 | dev = dev_get_by_index_rcu(net, ifindex); | |
851 | if (!dev) { | |
852 | rcu_read_unlock(); | |
853 | return -ENODEV; | |
854 | } | |
855 | ||
856 | strcpy(name, dev->name); | |
857 | rcu_read_unlock(); | |
858 | if (read_seqcount_retry(&devnet_rename_seq, seq)) { | |
859 | cond_resched(); | |
860 | goto retry; | |
861 | } | |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
1da177e4 | 866 | /** |
941666c2 | 867 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 868 | * @net: the applicable net namespace |
1da177e4 LT |
869 | * @type: media type of device |
870 | * @ha: hardware address | |
871 | * | |
872 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
873 | * is not found or a pointer to the device. |
874 | * The caller must hold RCU or RTNL. | |
941666c2 | 875 | * The returned device has not had its ref count increased |
1da177e4 LT |
876 | * and the caller must therefore be careful about locking |
877 | * | |
1da177e4 LT |
878 | */ |
879 | ||
941666c2 ED |
880 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
881 | const char *ha) | |
1da177e4 LT |
882 | { |
883 | struct net_device *dev; | |
884 | ||
941666c2 | 885 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
886 | if (dev->type == type && |
887 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
888 | return dev; |
889 | ||
890 | return NULL; | |
1da177e4 | 891 | } |
941666c2 | 892 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 893 | |
881d966b | 894 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
895 | { |
896 | struct net_device *dev; | |
897 | ||
4e9cac2b | 898 | ASSERT_RTNL(); |
881d966b | 899 | for_each_netdev(net, dev) |
4e9cac2b | 900 | if (dev->type == type) |
7562f876 PE |
901 | return dev; |
902 | ||
903 | return NULL; | |
4e9cac2b | 904 | } |
4e9cac2b PM |
905 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
906 | ||
881d966b | 907 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 908 | { |
99fe3c39 | 909 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 910 | |
99fe3c39 ED |
911 | rcu_read_lock(); |
912 | for_each_netdev_rcu(net, dev) | |
913 | if (dev->type == type) { | |
914 | dev_hold(dev); | |
915 | ret = dev; | |
916 | break; | |
917 | } | |
918 | rcu_read_unlock(); | |
919 | return ret; | |
1da177e4 | 920 | } |
1da177e4 LT |
921 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
922 | ||
923 | /** | |
6c555490 | 924 | * __dev_get_by_flags - find any device with given flags |
c4ea43c5 | 925 | * @net: the applicable net namespace |
1da177e4 LT |
926 | * @if_flags: IFF_* values |
927 | * @mask: bitmask of bits in if_flags to check | |
928 | * | |
929 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 | 930 | * is not found or a pointer to the device. Must be called inside |
6c555490 | 931 | * rtnl_lock(), and result refcount is unchanged. |
1da177e4 LT |
932 | */ |
933 | ||
6c555490 WC |
934 | struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
935 | unsigned short mask) | |
1da177e4 | 936 | { |
7562f876 | 937 | struct net_device *dev, *ret; |
1da177e4 | 938 | |
6c555490 WC |
939 | ASSERT_RTNL(); |
940 | ||
7562f876 | 941 | ret = NULL; |
6c555490 | 942 | for_each_netdev(net, dev) { |
1da177e4 | 943 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 944 | ret = dev; |
1da177e4 LT |
945 | break; |
946 | } | |
947 | } | |
7562f876 | 948 | return ret; |
1da177e4 | 949 | } |
6c555490 | 950 | EXPORT_SYMBOL(__dev_get_by_flags); |
1da177e4 LT |
951 | |
952 | /** | |
953 | * dev_valid_name - check if name is okay for network device | |
954 | * @name: name string | |
955 | * | |
956 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
957 | * to allow sysfs to work. We also disallow any kind of |
958 | * whitespace. | |
1da177e4 | 959 | */ |
95f050bf | 960 | bool dev_valid_name(const char *name) |
1da177e4 | 961 | { |
c7fa9d18 | 962 | if (*name == '\0') |
95f050bf | 963 | return false; |
b6fe17d6 | 964 | if (strlen(name) >= IFNAMSIZ) |
95f050bf | 965 | return false; |
c7fa9d18 | 966 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 967 | return false; |
c7fa9d18 DM |
968 | |
969 | while (*name) { | |
a4176a93 | 970 | if (*name == '/' || *name == ':' || isspace(*name)) |
95f050bf | 971 | return false; |
c7fa9d18 DM |
972 | name++; |
973 | } | |
95f050bf | 974 | return true; |
1da177e4 | 975 | } |
d1b19dff | 976 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
977 | |
978 | /** | |
b267b179 EB |
979 | * __dev_alloc_name - allocate a name for a device |
980 | * @net: network namespace to allocate the device name in | |
1da177e4 | 981 | * @name: name format string |
b267b179 | 982 | * @buf: scratch buffer and result name string |
1da177e4 LT |
983 | * |
984 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
985 | * id. It scans list of devices to build up a free map, then chooses |
986 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
987 | * while allocating the name and adding the device in order to avoid | |
988 | * duplicates. | |
989 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
990 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
991 | */ |
992 | ||
b267b179 | 993 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
994 | { |
995 | int i = 0; | |
1da177e4 LT |
996 | const char *p; |
997 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 998 | unsigned long *inuse; |
1da177e4 LT |
999 | struct net_device *d; |
1000 | ||
1001 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
1002 | if (p) { | |
1003 | /* | |
1004 | * Verify the string as this thing may have come from | |
1005 | * the user. There must be either one "%d" and no other "%" | |
1006 | * characters. | |
1007 | */ | |
1008 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
1009 | return -EINVAL; | |
1010 | ||
1011 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 1012 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
1013 | if (!inuse) |
1014 | return -ENOMEM; | |
1015 | ||
881d966b | 1016 | for_each_netdev(net, d) { |
1da177e4 LT |
1017 | if (!sscanf(d->name, name, &i)) |
1018 | continue; | |
1019 | if (i < 0 || i >= max_netdevices) | |
1020 | continue; | |
1021 | ||
1022 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 1023 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
1024 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
1025 | set_bit(i, inuse); | |
1026 | } | |
1027 | ||
1028 | i = find_first_zero_bit(inuse, max_netdevices); | |
1029 | free_page((unsigned long) inuse); | |
1030 | } | |
1031 | ||
d9031024 OP |
1032 | if (buf != name) |
1033 | snprintf(buf, IFNAMSIZ, name, i); | |
b267b179 | 1034 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1035 | return i; |
1da177e4 LT |
1036 | |
1037 | /* It is possible to run out of possible slots | |
1038 | * when the name is long and there isn't enough space left | |
1039 | * for the digits, or if all bits are used. | |
1040 | */ | |
1041 | return -ENFILE; | |
1042 | } | |
1043 | ||
b267b179 EB |
1044 | /** |
1045 | * dev_alloc_name - allocate a name for a device | |
1046 | * @dev: device | |
1047 | * @name: name format string | |
1048 | * | |
1049 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1050 | * id. It scans list of devices to build up a free map, then chooses | |
1051 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1052 | * while allocating the name and adding the device in order to avoid | |
1053 | * duplicates. | |
1054 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1055 | * Returns the number of the unit assigned or a negative errno code. | |
1056 | */ | |
1057 | ||
1058 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1059 | { | |
1060 | char buf[IFNAMSIZ]; | |
1061 | struct net *net; | |
1062 | int ret; | |
1063 | ||
c346dca1 YH |
1064 | BUG_ON(!dev_net(dev)); |
1065 | net = dev_net(dev); | |
b267b179 EB |
1066 | ret = __dev_alloc_name(net, name, buf); |
1067 | if (ret >= 0) | |
1068 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1069 | return ret; | |
1070 | } | |
d1b19dff | 1071 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1072 | |
828de4f6 G |
1073 | static int dev_alloc_name_ns(struct net *net, |
1074 | struct net_device *dev, | |
1075 | const char *name) | |
d9031024 | 1076 | { |
828de4f6 G |
1077 | char buf[IFNAMSIZ]; |
1078 | int ret; | |
8ce6cebc | 1079 | |
828de4f6 G |
1080 | ret = __dev_alloc_name(net, name, buf); |
1081 | if (ret >= 0) | |
1082 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1083 | return ret; | |
1084 | } | |
1085 | ||
1086 | static int dev_get_valid_name(struct net *net, | |
1087 | struct net_device *dev, | |
1088 | const char *name) | |
1089 | { | |
1090 | BUG_ON(!net); | |
8ce6cebc | 1091 | |
d9031024 OP |
1092 | if (!dev_valid_name(name)) |
1093 | return -EINVAL; | |
1094 | ||
1c5cae81 | 1095 | if (strchr(name, '%')) |
828de4f6 | 1096 | return dev_alloc_name_ns(net, dev, name); |
d9031024 OP |
1097 | else if (__dev_get_by_name(net, name)) |
1098 | return -EEXIST; | |
8ce6cebc DL |
1099 | else if (dev->name != name) |
1100 | strlcpy(dev->name, name, IFNAMSIZ); | |
d9031024 OP |
1101 | |
1102 | return 0; | |
1103 | } | |
1da177e4 LT |
1104 | |
1105 | /** | |
1106 | * dev_change_name - change name of a device | |
1107 | * @dev: device | |
1108 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1109 | * | |
1110 | * Change name of a device, can pass format strings "eth%d". | |
1111 | * for wildcarding. | |
1112 | */ | |
cf04a4c7 | 1113 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1114 | { |
238fa362 | 1115 | unsigned char old_assign_type; |
fcc5a03a | 1116 | char oldname[IFNAMSIZ]; |
1da177e4 | 1117 | int err = 0; |
fcc5a03a | 1118 | int ret; |
881d966b | 1119 | struct net *net; |
1da177e4 LT |
1120 | |
1121 | ASSERT_RTNL(); | |
c346dca1 | 1122 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1123 | |
c346dca1 | 1124 | net = dev_net(dev); |
1da177e4 LT |
1125 | if (dev->flags & IFF_UP) |
1126 | return -EBUSY; | |
1127 | ||
30e6c9fa | 1128 | write_seqcount_begin(&devnet_rename_seq); |
c91f6df2 BH |
1129 | |
1130 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
30e6c9fa | 1131 | write_seqcount_end(&devnet_rename_seq); |
c8d90dca | 1132 | return 0; |
c91f6df2 | 1133 | } |
c8d90dca | 1134 | |
fcc5a03a HX |
1135 | memcpy(oldname, dev->name, IFNAMSIZ); |
1136 | ||
828de4f6 | 1137 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1138 | if (err < 0) { |
30e6c9fa | 1139 | write_seqcount_end(&devnet_rename_seq); |
d9031024 | 1140 | return err; |
c91f6df2 | 1141 | } |
1da177e4 | 1142 | |
6fe82a39 VF |
1143 | if (oldname[0] && !strchr(oldname, '%')) |
1144 | netdev_info(dev, "renamed from %s\n", oldname); | |
1145 | ||
238fa362 TG |
1146 | old_assign_type = dev->name_assign_type; |
1147 | dev->name_assign_type = NET_NAME_RENAMED; | |
1148 | ||
fcc5a03a | 1149 | rollback: |
a1b3f594 EB |
1150 | ret = device_rename(&dev->dev, dev->name); |
1151 | if (ret) { | |
1152 | memcpy(dev->name, oldname, IFNAMSIZ); | |
238fa362 | 1153 | dev->name_assign_type = old_assign_type; |
30e6c9fa | 1154 | write_seqcount_end(&devnet_rename_seq); |
a1b3f594 | 1155 | return ret; |
dcc99773 | 1156 | } |
7f988eab | 1157 | |
30e6c9fa | 1158 | write_seqcount_end(&devnet_rename_seq); |
c91f6df2 | 1159 | |
5bb025fa VF |
1160 | netdev_adjacent_rename_links(dev, oldname); |
1161 | ||
7f988eab | 1162 | write_lock_bh(&dev_base_lock); |
372b2312 | 1163 | hlist_del_rcu(&dev->name_hlist); |
72c9528b ED |
1164 | write_unlock_bh(&dev_base_lock); |
1165 | ||
1166 | synchronize_rcu(); | |
1167 | ||
1168 | write_lock_bh(&dev_base_lock); | |
1169 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
7f988eab HX |
1170 | write_unlock_bh(&dev_base_lock); |
1171 | ||
056925ab | 1172 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1173 | ret = notifier_to_errno(ret); |
1174 | ||
1175 | if (ret) { | |
91e9c07b ED |
1176 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1177 | if (err >= 0) { | |
fcc5a03a | 1178 | err = ret; |
30e6c9fa | 1179 | write_seqcount_begin(&devnet_rename_seq); |
fcc5a03a | 1180 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1181 | memcpy(oldname, newname, IFNAMSIZ); |
238fa362 TG |
1182 | dev->name_assign_type = old_assign_type; |
1183 | old_assign_type = NET_NAME_RENAMED; | |
fcc5a03a | 1184 | goto rollback; |
91e9c07b | 1185 | } else { |
7b6cd1ce | 1186 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1187 | dev->name, ret); |
fcc5a03a HX |
1188 | } |
1189 | } | |
1da177e4 LT |
1190 | |
1191 | return err; | |
1192 | } | |
1193 | ||
0b815a1a SH |
1194 | /** |
1195 | * dev_set_alias - change ifalias of a device | |
1196 | * @dev: device | |
1197 | * @alias: name up to IFALIASZ | |
f0db275a | 1198 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1199 | * |
1200 | * Set ifalias for a device, | |
1201 | */ | |
1202 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1203 | { | |
7364e445 AK |
1204 | char *new_ifalias; |
1205 | ||
0b815a1a SH |
1206 | ASSERT_RTNL(); |
1207 | ||
1208 | if (len >= IFALIASZ) | |
1209 | return -EINVAL; | |
1210 | ||
96ca4a2c | 1211 | if (!len) { |
388dfc2d SK |
1212 | kfree(dev->ifalias); |
1213 | dev->ifalias = NULL; | |
96ca4a2c OH |
1214 | return 0; |
1215 | } | |
1216 | ||
7364e445 AK |
1217 | new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
1218 | if (!new_ifalias) | |
0b815a1a | 1219 | return -ENOMEM; |
7364e445 | 1220 | dev->ifalias = new_ifalias; |
0b815a1a SH |
1221 | |
1222 | strlcpy(dev->ifalias, alias, len+1); | |
1223 | return len; | |
1224 | } | |
1225 | ||
1226 | ||
d8a33ac4 | 1227 | /** |
3041a069 | 1228 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1229 | * @dev: device to cause notification |
1230 | * | |
1231 | * Called to indicate a device has changed features. | |
1232 | */ | |
1233 | void netdev_features_change(struct net_device *dev) | |
1234 | { | |
056925ab | 1235 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1236 | } |
1237 | EXPORT_SYMBOL(netdev_features_change); | |
1238 | ||
1da177e4 LT |
1239 | /** |
1240 | * netdev_state_change - device changes state | |
1241 | * @dev: device to cause notification | |
1242 | * | |
1243 | * Called to indicate a device has changed state. This function calls | |
1244 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1245 | * to the routing socket. | |
1246 | */ | |
1247 | void netdev_state_change(struct net_device *dev) | |
1248 | { | |
1249 | if (dev->flags & IFF_UP) { | |
54951194 LP |
1250 | struct netdev_notifier_change_info change_info; |
1251 | ||
1252 | change_info.flags_changed = 0; | |
1253 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
1254 | &change_info.info); | |
7f294054 | 1255 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1256 | } |
1257 | } | |
d1b19dff | 1258 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1259 | |
ee89bab1 AW |
1260 | /** |
1261 | * netdev_notify_peers - notify network peers about existence of @dev | |
1262 | * @dev: network device | |
1263 | * | |
1264 | * Generate traffic such that interested network peers are aware of | |
1265 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1266 | * a device wants to inform the rest of the network about some sort of | |
1267 | * reconfiguration such as a failover event or virtual machine | |
1268 | * migration. | |
1269 | */ | |
1270 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1271 | { |
ee89bab1 AW |
1272 | rtnl_lock(); |
1273 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
1274 | rtnl_unlock(); | |
c1da4ac7 | 1275 | } |
ee89bab1 | 1276 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1277 | |
bd380811 | 1278 | static int __dev_open(struct net_device *dev) |
1da177e4 | 1279 | { |
d314774c | 1280 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1281 | int ret; |
1da177e4 | 1282 | |
e46b66bc BH |
1283 | ASSERT_RTNL(); |
1284 | ||
1da177e4 LT |
1285 | if (!netif_device_present(dev)) |
1286 | return -ENODEV; | |
1287 | ||
ca99ca14 NH |
1288 | /* Block netpoll from trying to do any rx path servicing. |
1289 | * If we don't do this there is a chance ndo_poll_controller | |
1290 | * or ndo_poll may be running while we open the device | |
1291 | */ | |
66b5552f | 1292 | netpoll_poll_disable(dev); |
ca99ca14 | 1293 | |
3b8bcfd5 JB |
1294 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
1295 | ret = notifier_to_errno(ret); | |
1296 | if (ret) | |
1297 | return ret; | |
1298 | ||
1da177e4 | 1299 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1300 | |
d314774c SH |
1301 | if (ops->ndo_validate_addr) |
1302 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1303 | |
d314774c SH |
1304 | if (!ret && ops->ndo_open) |
1305 | ret = ops->ndo_open(dev); | |
1da177e4 | 1306 | |
66b5552f | 1307 | netpoll_poll_enable(dev); |
ca99ca14 | 1308 | |
bada339b JG |
1309 | if (ret) |
1310 | clear_bit(__LINK_STATE_START, &dev->state); | |
1311 | else { | |
1da177e4 | 1312 | dev->flags |= IFF_UP; |
4417da66 | 1313 | dev_set_rx_mode(dev); |
1da177e4 | 1314 | dev_activate(dev); |
7bf23575 | 1315 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1316 | } |
bada339b | 1317 | |
1da177e4 LT |
1318 | return ret; |
1319 | } | |
1320 | ||
1321 | /** | |
bd380811 PM |
1322 | * dev_open - prepare an interface for use. |
1323 | * @dev: device to open | |
1da177e4 | 1324 | * |
bd380811 PM |
1325 | * Takes a device from down to up state. The device's private open |
1326 | * function is invoked and then the multicast lists are loaded. Finally | |
1327 | * the device is moved into the up state and a %NETDEV_UP message is | |
1328 | * sent to the netdev notifier chain. | |
1329 | * | |
1330 | * Calling this function on an active interface is a nop. On a failure | |
1331 | * a negative errno code is returned. | |
1da177e4 | 1332 | */ |
bd380811 PM |
1333 | int dev_open(struct net_device *dev) |
1334 | { | |
1335 | int ret; | |
1336 | ||
bd380811 PM |
1337 | if (dev->flags & IFF_UP) |
1338 | return 0; | |
1339 | ||
bd380811 PM |
1340 | ret = __dev_open(dev); |
1341 | if (ret < 0) | |
1342 | return ret; | |
1343 | ||
7f294054 | 1344 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1345 | call_netdevice_notifiers(NETDEV_UP, dev); |
1346 | ||
1347 | return ret; | |
1348 | } | |
1349 | EXPORT_SYMBOL(dev_open); | |
1350 | ||
44345724 | 1351 | static int __dev_close_many(struct list_head *head) |
1da177e4 | 1352 | { |
44345724 | 1353 | struct net_device *dev; |
e46b66bc | 1354 | |
bd380811 | 1355 | ASSERT_RTNL(); |
9d5010db DM |
1356 | might_sleep(); |
1357 | ||
5cde2829 | 1358 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1359 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1360 | netpoll_poll_disable(dev); |
3f4df206 | 1361 | |
44345724 | 1362 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1363 | |
44345724 | 1364 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1365 | |
44345724 OP |
1366 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1367 | * can be even on different cpu. So just clear netif_running(). | |
1368 | * | |
1369 | * dev->stop() will invoke napi_disable() on all of it's | |
1370 | * napi_struct instances on this device. | |
1371 | */ | |
4e857c58 | 1372 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1373 | } |
1da177e4 | 1374 | |
44345724 | 1375 | dev_deactivate_many(head); |
d8b2a4d2 | 1376 | |
5cde2829 | 1377 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1378 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1379 | |
44345724 OP |
1380 | /* |
1381 | * Call the device specific close. This cannot fail. | |
1382 | * Only if device is UP | |
1383 | * | |
1384 | * We allow it to be called even after a DETACH hot-plug | |
1385 | * event. | |
1386 | */ | |
1387 | if (ops->ndo_stop) | |
1388 | ops->ndo_stop(dev); | |
1389 | ||
44345724 | 1390 | dev->flags &= ~IFF_UP; |
66b5552f | 1391 | netpoll_poll_enable(dev); |
44345724 OP |
1392 | } |
1393 | ||
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | static int __dev_close(struct net_device *dev) | |
1398 | { | |
f87e6f47 | 1399 | int retval; |
44345724 OP |
1400 | LIST_HEAD(single); |
1401 | ||
5cde2829 | 1402 | list_add(&dev->close_list, &single); |
f87e6f47 LT |
1403 | retval = __dev_close_many(&single); |
1404 | list_del(&single); | |
ca99ca14 | 1405 | |
f87e6f47 | 1406 | return retval; |
44345724 OP |
1407 | } |
1408 | ||
99c4a26a | 1409 | int dev_close_many(struct list_head *head, bool unlink) |
44345724 OP |
1410 | { |
1411 | struct net_device *dev, *tmp; | |
1da177e4 | 1412 | |
5cde2829 EB |
1413 | /* Remove the devices that don't need to be closed */ |
1414 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1415 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1416 | list_del_init(&dev->close_list); |
44345724 OP |
1417 | |
1418 | __dev_close_many(head); | |
1da177e4 | 1419 | |
5cde2829 | 1420 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1421 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1422 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
99c4a26a DM |
1423 | if (unlink) |
1424 | list_del_init(&dev->close_list); | |
44345724 | 1425 | } |
bd380811 PM |
1426 | |
1427 | return 0; | |
1428 | } | |
99c4a26a | 1429 | EXPORT_SYMBOL(dev_close_many); |
bd380811 PM |
1430 | |
1431 | /** | |
1432 | * dev_close - shutdown an interface. | |
1433 | * @dev: device to shutdown | |
1434 | * | |
1435 | * This function moves an active device into down state. A | |
1436 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1437 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1438 | * chain. | |
1439 | */ | |
1440 | int dev_close(struct net_device *dev) | |
1441 | { | |
e14a5993 ED |
1442 | if (dev->flags & IFF_UP) { |
1443 | LIST_HEAD(single); | |
1da177e4 | 1444 | |
5cde2829 | 1445 | list_add(&dev->close_list, &single); |
99c4a26a | 1446 | dev_close_many(&single, true); |
e14a5993 ED |
1447 | list_del(&single); |
1448 | } | |
da6e378b | 1449 | return 0; |
1da177e4 | 1450 | } |
d1b19dff | 1451 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1452 | |
1453 | ||
0187bdfb BH |
1454 | /** |
1455 | * dev_disable_lro - disable Large Receive Offload on a device | |
1456 | * @dev: device | |
1457 | * | |
1458 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1459 | * called under RTNL. This is needed if received packets may be | |
1460 | * forwarded to another interface. | |
1461 | */ | |
1462 | void dev_disable_lro(struct net_device *dev) | |
1463 | { | |
fbe168ba MK |
1464 | struct net_device *lower_dev; |
1465 | struct list_head *iter; | |
529d0489 | 1466 | |
bc5787c6 MM |
1467 | dev->wanted_features &= ~NETIF_F_LRO; |
1468 | netdev_update_features(dev); | |
27660515 | 1469 | |
22d5969f MM |
1470 | if (unlikely(dev->features & NETIF_F_LRO)) |
1471 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
fbe168ba MK |
1472 | |
1473 | netdev_for_each_lower_dev(dev, lower_dev, iter) | |
1474 | dev_disable_lro(lower_dev); | |
0187bdfb BH |
1475 | } |
1476 | EXPORT_SYMBOL(dev_disable_lro); | |
1477 | ||
351638e7 JP |
1478 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1479 | struct net_device *dev) | |
1480 | { | |
1481 | struct netdev_notifier_info info; | |
1482 | ||
1483 | netdev_notifier_info_init(&info, dev); | |
1484 | return nb->notifier_call(nb, val, &info); | |
1485 | } | |
0187bdfb | 1486 | |
881d966b EB |
1487 | static int dev_boot_phase = 1; |
1488 | ||
1da177e4 LT |
1489 | /** |
1490 | * register_netdevice_notifier - register a network notifier block | |
1491 | * @nb: notifier | |
1492 | * | |
1493 | * Register a notifier to be called when network device events occur. | |
1494 | * The notifier passed is linked into the kernel structures and must | |
1495 | * not be reused until it has been unregistered. A negative errno code | |
1496 | * is returned on a failure. | |
1497 | * | |
1498 | * When registered all registration and up events are replayed | |
4ec93edb | 1499 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
1500 | * view of the network device list. |
1501 | */ | |
1502 | ||
1503 | int register_netdevice_notifier(struct notifier_block *nb) | |
1504 | { | |
1505 | struct net_device *dev; | |
fcc5a03a | 1506 | struct net_device *last; |
881d966b | 1507 | struct net *net; |
1da177e4 LT |
1508 | int err; |
1509 | ||
1510 | rtnl_lock(); | |
f07d5b94 | 1511 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1512 | if (err) |
1513 | goto unlock; | |
881d966b EB |
1514 | if (dev_boot_phase) |
1515 | goto unlock; | |
1516 | for_each_net(net) { | |
1517 | for_each_netdev(net, dev) { | |
351638e7 | 1518 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
881d966b EB |
1519 | err = notifier_to_errno(err); |
1520 | if (err) | |
1521 | goto rollback; | |
1522 | ||
1523 | if (!(dev->flags & IFF_UP)) | |
1524 | continue; | |
1da177e4 | 1525 | |
351638e7 | 1526 | call_netdevice_notifier(nb, NETDEV_UP, dev); |
881d966b | 1527 | } |
1da177e4 | 1528 | } |
fcc5a03a HX |
1529 | |
1530 | unlock: | |
1da177e4 LT |
1531 | rtnl_unlock(); |
1532 | return err; | |
fcc5a03a HX |
1533 | |
1534 | rollback: | |
1535 | last = dev; | |
881d966b EB |
1536 | for_each_net(net) { |
1537 | for_each_netdev(net, dev) { | |
1538 | if (dev == last) | |
8f891489 | 1539 | goto outroll; |
fcc5a03a | 1540 | |
881d966b | 1541 | if (dev->flags & IFF_UP) { |
351638e7 JP |
1542 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1543 | dev); | |
1544 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
881d966b | 1545 | } |
351638e7 | 1546 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
fcc5a03a | 1547 | } |
fcc5a03a | 1548 | } |
c67625a1 | 1549 | |
8f891489 | 1550 | outroll: |
c67625a1 | 1551 | raw_notifier_chain_unregister(&netdev_chain, nb); |
fcc5a03a | 1552 | goto unlock; |
1da177e4 | 1553 | } |
d1b19dff | 1554 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1555 | |
1556 | /** | |
1557 | * unregister_netdevice_notifier - unregister a network notifier block | |
1558 | * @nb: notifier | |
1559 | * | |
1560 | * Unregister a notifier previously registered by | |
1561 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1562 | * kernel structures and may then be reused. A negative errno code | |
1563 | * is returned on a failure. | |
7d3d43da EB |
1564 | * |
1565 | * After unregistering unregister and down device events are synthesized | |
1566 | * for all devices on the device list to the removed notifier to remove | |
1567 | * the need for special case cleanup code. | |
1da177e4 LT |
1568 | */ |
1569 | ||
1570 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1571 | { | |
7d3d43da EB |
1572 | struct net_device *dev; |
1573 | struct net *net; | |
9f514950 HX |
1574 | int err; |
1575 | ||
1576 | rtnl_lock(); | |
f07d5b94 | 1577 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1578 | if (err) |
1579 | goto unlock; | |
1580 | ||
1581 | for_each_net(net) { | |
1582 | for_each_netdev(net, dev) { | |
1583 | if (dev->flags & IFF_UP) { | |
351638e7 JP |
1584 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1585 | dev); | |
1586 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
7d3d43da | 1587 | } |
351638e7 | 1588 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
7d3d43da EB |
1589 | } |
1590 | } | |
1591 | unlock: | |
9f514950 HX |
1592 | rtnl_unlock(); |
1593 | return err; | |
1da177e4 | 1594 | } |
d1b19dff | 1595 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1596 | |
351638e7 JP |
1597 | /** |
1598 | * call_netdevice_notifiers_info - call all network notifier blocks | |
1599 | * @val: value passed unmodified to notifier function | |
1600 | * @dev: net_device pointer passed unmodified to notifier function | |
1601 | * @info: notifier information data | |
1602 | * | |
1603 | * Call all network notifier blocks. Parameters and return value | |
1604 | * are as for raw_notifier_call_chain(). | |
1605 | */ | |
1606 | ||
1d143d9f | 1607 | static int call_netdevice_notifiers_info(unsigned long val, |
1608 | struct net_device *dev, | |
1609 | struct netdev_notifier_info *info) | |
351638e7 JP |
1610 | { |
1611 | ASSERT_RTNL(); | |
1612 | netdev_notifier_info_init(info, dev); | |
1613 | return raw_notifier_call_chain(&netdev_chain, val, info); | |
1614 | } | |
351638e7 | 1615 | |
1da177e4 LT |
1616 | /** |
1617 | * call_netdevice_notifiers - call all network notifier blocks | |
1618 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1619 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1620 | * |
1621 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1622 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1623 | */ |
1624 | ||
ad7379d4 | 1625 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1626 | { |
351638e7 JP |
1627 | struct netdev_notifier_info info; |
1628 | ||
1629 | return call_netdevice_notifiers_info(val, dev, &info); | |
1da177e4 | 1630 | } |
edf947f1 | 1631 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 1632 | |
c5905afb | 1633 | static struct static_key netstamp_needed __read_mostly; |
b90e5794 | 1634 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 1635 | /* We are not allowed to call static_key_slow_dec() from irq context |
b90e5794 | 1636 | * If net_disable_timestamp() is called from irq context, defer the |
c5905afb | 1637 | * static_key_slow_dec() calls. |
b90e5794 ED |
1638 | */ |
1639 | static atomic_t netstamp_needed_deferred; | |
1640 | #endif | |
1da177e4 LT |
1641 | |
1642 | void net_enable_timestamp(void) | |
1643 | { | |
b90e5794 ED |
1644 | #ifdef HAVE_JUMP_LABEL |
1645 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); | |
1646 | ||
1647 | if (deferred) { | |
1648 | while (--deferred) | |
c5905afb | 1649 | static_key_slow_dec(&netstamp_needed); |
b90e5794 ED |
1650 | return; |
1651 | } | |
1652 | #endif | |
c5905afb | 1653 | static_key_slow_inc(&netstamp_needed); |
1da177e4 | 1654 | } |
d1b19dff | 1655 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1656 | |
1657 | void net_disable_timestamp(void) | |
1658 | { | |
b90e5794 ED |
1659 | #ifdef HAVE_JUMP_LABEL |
1660 | if (in_interrupt()) { | |
1661 | atomic_inc(&netstamp_needed_deferred); | |
1662 | return; | |
1663 | } | |
1664 | #endif | |
c5905afb | 1665 | static_key_slow_dec(&netstamp_needed); |
1da177e4 | 1666 | } |
d1b19dff | 1667 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1668 | |
3b098e2d | 1669 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 1670 | { |
588f0330 | 1671 | skb->tstamp.tv64 = 0; |
c5905afb | 1672 | if (static_key_false(&netstamp_needed)) |
a61bbcf2 | 1673 | __net_timestamp(skb); |
1da177e4 LT |
1674 | } |
1675 | ||
588f0330 | 1676 | #define net_timestamp_check(COND, SKB) \ |
c5905afb | 1677 | if (static_key_false(&netstamp_needed)) { \ |
588f0330 ED |
1678 | if ((COND) && !(SKB)->tstamp.tv64) \ |
1679 | __net_timestamp(SKB); \ | |
1680 | } \ | |
3b098e2d | 1681 | |
1ee481fb | 1682 | bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb) |
79b569f0 DL |
1683 | { |
1684 | unsigned int len; | |
1685 | ||
1686 | if (!(dev->flags & IFF_UP)) | |
1687 | return false; | |
1688 | ||
1689 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; | |
1690 | if (skb->len <= len) | |
1691 | return true; | |
1692 | ||
1693 | /* if TSO is enabled, we don't care about the length as the packet | |
1694 | * could be forwarded without being segmented before | |
1695 | */ | |
1696 | if (skb_is_gso(skb)) | |
1697 | return true; | |
1698 | ||
1699 | return false; | |
1700 | } | |
1ee481fb | 1701 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 1702 | |
a0265d28 HX |
1703 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
1704 | { | |
1705 | if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) { | |
1706 | if (skb_copy_ubufs(skb, GFP_ATOMIC)) { | |
1707 | atomic_long_inc(&dev->rx_dropped); | |
1708 | kfree_skb(skb); | |
1709 | return NET_RX_DROP; | |
1710 | } | |
1711 | } | |
1712 | ||
1713 | if (unlikely(!is_skb_forwardable(dev, skb))) { | |
1714 | atomic_long_inc(&dev->rx_dropped); | |
1715 | kfree_skb(skb); | |
1716 | return NET_RX_DROP; | |
1717 | } | |
1718 | ||
1719 | skb_scrub_packet(skb, true); | |
08b4b8ea | 1720 | skb->priority = 0; |
a0265d28 | 1721 | skb->protocol = eth_type_trans(skb, dev); |
2c26d34b | 1722 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
a0265d28 HX |
1723 | |
1724 | return 0; | |
1725 | } | |
1726 | EXPORT_SYMBOL_GPL(__dev_forward_skb); | |
1727 | ||
44540960 AB |
1728 | /** |
1729 | * dev_forward_skb - loopback an skb to another netif | |
1730 | * | |
1731 | * @dev: destination network device | |
1732 | * @skb: buffer to forward | |
1733 | * | |
1734 | * return values: | |
1735 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 1736 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
1737 | * |
1738 | * dev_forward_skb can be used for injecting an skb from the | |
1739 | * start_xmit function of one device into the receive queue | |
1740 | * of another device. | |
1741 | * | |
1742 | * The receiving device may be in another namespace, so | |
1743 | * we have to clear all information in the skb that could | |
1744 | * impact namespace isolation. | |
1745 | */ | |
1746 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
1747 | { | |
a0265d28 | 1748 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
1749 | } |
1750 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
1751 | ||
71d9dec2 CG |
1752 | static inline int deliver_skb(struct sk_buff *skb, |
1753 | struct packet_type *pt_prev, | |
1754 | struct net_device *orig_dev) | |
1755 | { | |
1080e512 MT |
1756 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
1757 | return -ENOMEM; | |
71d9dec2 CG |
1758 | atomic_inc(&skb->users); |
1759 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1760 | } | |
1761 | ||
7866a621 SN |
1762 | static inline void deliver_ptype_list_skb(struct sk_buff *skb, |
1763 | struct packet_type **pt, | |
fbcb2170 JP |
1764 | struct net_device *orig_dev, |
1765 | __be16 type, | |
7866a621 SN |
1766 | struct list_head *ptype_list) |
1767 | { | |
1768 | struct packet_type *ptype, *pt_prev = *pt; | |
1769 | ||
1770 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
1771 | if (ptype->type != type) | |
1772 | continue; | |
1773 | if (pt_prev) | |
fbcb2170 | 1774 | deliver_skb(skb, pt_prev, orig_dev); |
7866a621 SN |
1775 | pt_prev = ptype; |
1776 | } | |
1777 | *pt = pt_prev; | |
1778 | } | |
1779 | ||
c0de08d0 EL |
1780 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
1781 | { | |
a3d744e9 | 1782 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
1783 | return false; |
1784 | ||
1785 | if (ptype->id_match) | |
1786 | return ptype->id_match(ptype, skb->sk); | |
1787 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
1788 | return true; | |
1789 | ||
1790 | return false; | |
1791 | } | |
1792 | ||
1da177e4 LT |
1793 | /* |
1794 | * Support routine. Sends outgoing frames to any network | |
1795 | * taps currently in use. | |
1796 | */ | |
1797 | ||
f6a78bfc | 1798 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1799 | { |
1800 | struct packet_type *ptype; | |
71d9dec2 CG |
1801 | struct sk_buff *skb2 = NULL; |
1802 | struct packet_type *pt_prev = NULL; | |
7866a621 | 1803 | struct list_head *ptype_list = &ptype_all; |
a61bbcf2 | 1804 | |
1da177e4 | 1805 | rcu_read_lock(); |
7866a621 SN |
1806 | again: |
1807 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
1da177e4 LT |
1808 | /* Never send packets back to the socket |
1809 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1810 | */ | |
7866a621 SN |
1811 | if (skb_loop_sk(ptype, skb)) |
1812 | continue; | |
71d9dec2 | 1813 | |
7866a621 SN |
1814 | if (pt_prev) { |
1815 | deliver_skb(skb2, pt_prev, skb->dev); | |
1816 | pt_prev = ptype; | |
1817 | continue; | |
1818 | } | |
1da177e4 | 1819 | |
7866a621 SN |
1820 | /* need to clone skb, done only once */ |
1821 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1822 | if (!skb2) | |
1823 | goto out_unlock; | |
70978182 | 1824 | |
7866a621 | 1825 | net_timestamp_set(skb2); |
1da177e4 | 1826 | |
7866a621 SN |
1827 | /* skb->nh should be correctly |
1828 | * set by sender, so that the second statement is | |
1829 | * just protection against buggy protocols. | |
1830 | */ | |
1831 | skb_reset_mac_header(skb2); | |
1832 | ||
1833 | if (skb_network_header(skb2) < skb2->data || | |
1834 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { | |
1835 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", | |
1836 | ntohs(skb2->protocol), | |
1837 | dev->name); | |
1838 | skb_reset_network_header(skb2); | |
1da177e4 | 1839 | } |
7866a621 SN |
1840 | |
1841 | skb2->transport_header = skb2->network_header; | |
1842 | skb2->pkt_type = PACKET_OUTGOING; | |
1843 | pt_prev = ptype; | |
1844 | } | |
1845 | ||
1846 | if (ptype_list == &ptype_all) { | |
1847 | ptype_list = &dev->ptype_all; | |
1848 | goto again; | |
1da177e4 | 1849 | } |
7866a621 | 1850 | out_unlock: |
71d9dec2 CG |
1851 | if (pt_prev) |
1852 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
1da177e4 LT |
1853 | rcu_read_unlock(); |
1854 | } | |
1855 | ||
2c53040f BH |
1856 | /** |
1857 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
1858 | * @dev: Network device |
1859 | * @txq: number of queues available | |
1860 | * | |
1861 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
1862 | * valid. To resolve this verify the tc mapping remains valid and if | |
1863 | * not NULL the mapping. With no priorities mapping to this | |
1864 | * offset/count pair it will no longer be used. In the worst case TC0 | |
1865 | * is invalid nothing can be done so disable priority mappings. If is | |
1866 | * expected that drivers will fix this mapping if they can before | |
1867 | * calling netif_set_real_num_tx_queues. | |
1868 | */ | |
bb134d22 | 1869 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
1870 | { |
1871 | int i; | |
1872 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
1873 | ||
1874 | /* If TC0 is invalidated disable TC mapping */ | |
1875 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 1876 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
1877 | dev->num_tc = 0; |
1878 | return; | |
1879 | } | |
1880 | ||
1881 | /* Invalidated prio to tc mappings set to TC0 */ | |
1882 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
1883 | int q = netdev_get_prio_tc_map(dev, i); | |
1884 | ||
1885 | tc = &dev->tc_to_txq[q]; | |
1886 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
1887 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
1888 | i, q); | |
4f57c087 JF |
1889 | netdev_set_prio_tc_map(dev, i, 0); |
1890 | } | |
1891 | } | |
1892 | } | |
1893 | ||
537c00de AD |
1894 | #ifdef CONFIG_XPS |
1895 | static DEFINE_MUTEX(xps_map_mutex); | |
1896 | #define xmap_dereference(P) \ | |
1897 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
1898 | ||
10cdc3f3 AD |
1899 | static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps, |
1900 | int cpu, u16 index) | |
537c00de | 1901 | { |
10cdc3f3 AD |
1902 | struct xps_map *map = NULL; |
1903 | int pos; | |
537c00de | 1904 | |
10cdc3f3 AD |
1905 | if (dev_maps) |
1906 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
537c00de | 1907 | |
10cdc3f3 AD |
1908 | for (pos = 0; map && pos < map->len; pos++) { |
1909 | if (map->queues[pos] == index) { | |
537c00de AD |
1910 | if (map->len > 1) { |
1911 | map->queues[pos] = map->queues[--map->len]; | |
1912 | } else { | |
10cdc3f3 | 1913 | RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL); |
537c00de AD |
1914 | kfree_rcu(map, rcu); |
1915 | map = NULL; | |
1916 | } | |
10cdc3f3 | 1917 | break; |
537c00de | 1918 | } |
537c00de AD |
1919 | } |
1920 | ||
10cdc3f3 AD |
1921 | return map; |
1922 | } | |
1923 | ||
024e9679 | 1924 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
10cdc3f3 AD |
1925 | { |
1926 | struct xps_dev_maps *dev_maps; | |
024e9679 | 1927 | int cpu, i; |
10cdc3f3 AD |
1928 | bool active = false; |
1929 | ||
1930 | mutex_lock(&xps_map_mutex); | |
1931 | dev_maps = xmap_dereference(dev->xps_maps); | |
1932 | ||
1933 | if (!dev_maps) | |
1934 | goto out_no_maps; | |
1935 | ||
1936 | for_each_possible_cpu(cpu) { | |
024e9679 AD |
1937 | for (i = index; i < dev->num_tx_queues; i++) { |
1938 | if (!remove_xps_queue(dev_maps, cpu, i)) | |
1939 | break; | |
1940 | } | |
1941 | if (i == dev->num_tx_queues) | |
10cdc3f3 AD |
1942 | active = true; |
1943 | } | |
1944 | ||
1945 | if (!active) { | |
537c00de AD |
1946 | RCU_INIT_POINTER(dev->xps_maps, NULL); |
1947 | kfree_rcu(dev_maps, rcu); | |
1948 | } | |
1949 | ||
024e9679 AD |
1950 | for (i = index; i < dev->num_tx_queues; i++) |
1951 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i), | |
1952 | NUMA_NO_NODE); | |
1953 | ||
537c00de AD |
1954 | out_no_maps: |
1955 | mutex_unlock(&xps_map_mutex); | |
1956 | } | |
1957 | ||
01c5f864 AD |
1958 | static struct xps_map *expand_xps_map(struct xps_map *map, |
1959 | int cpu, u16 index) | |
1960 | { | |
1961 | struct xps_map *new_map; | |
1962 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
1963 | int i, pos; | |
1964 | ||
1965 | for (pos = 0; map && pos < map->len; pos++) { | |
1966 | if (map->queues[pos] != index) | |
1967 | continue; | |
1968 | return map; | |
1969 | } | |
1970 | ||
1971 | /* Need to add queue to this CPU's existing map */ | |
1972 | if (map) { | |
1973 | if (pos < map->alloc_len) | |
1974 | return map; | |
1975 | ||
1976 | alloc_len = map->alloc_len * 2; | |
1977 | } | |
1978 | ||
1979 | /* Need to allocate new map to store queue on this CPU's map */ | |
1980 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
1981 | cpu_to_node(cpu)); | |
1982 | if (!new_map) | |
1983 | return NULL; | |
1984 | ||
1985 | for (i = 0; i < pos; i++) | |
1986 | new_map->queues[i] = map->queues[i]; | |
1987 | new_map->alloc_len = alloc_len; | |
1988 | new_map->len = pos; | |
1989 | ||
1990 | return new_map; | |
1991 | } | |
1992 | ||
3573540c MT |
1993 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, |
1994 | u16 index) | |
537c00de | 1995 | { |
01c5f864 | 1996 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
537c00de | 1997 | struct xps_map *map, *new_map; |
537c00de | 1998 | int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES); |
01c5f864 AD |
1999 | int cpu, numa_node_id = -2; |
2000 | bool active = false; | |
537c00de AD |
2001 | |
2002 | mutex_lock(&xps_map_mutex); | |
2003 | ||
2004 | dev_maps = xmap_dereference(dev->xps_maps); | |
2005 | ||
01c5f864 AD |
2006 | /* allocate memory for queue storage */ |
2007 | for_each_online_cpu(cpu) { | |
2008 | if (!cpumask_test_cpu(cpu, mask)) | |
2009 | continue; | |
2010 | ||
2011 | if (!new_dev_maps) | |
2012 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); | |
2bb60cb9 AD |
2013 | if (!new_dev_maps) { |
2014 | mutex_unlock(&xps_map_mutex); | |
01c5f864 | 2015 | return -ENOMEM; |
2bb60cb9 | 2016 | } |
01c5f864 AD |
2017 | |
2018 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : | |
2019 | NULL; | |
2020 | ||
2021 | map = expand_xps_map(map, cpu, index); | |
2022 | if (!map) | |
2023 | goto error; | |
2024 | ||
2025 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); | |
2026 | } | |
2027 | ||
2028 | if (!new_dev_maps) | |
2029 | goto out_no_new_maps; | |
2030 | ||
537c00de | 2031 | for_each_possible_cpu(cpu) { |
01c5f864 AD |
2032 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) { |
2033 | /* add queue to CPU maps */ | |
2034 | int pos = 0; | |
2035 | ||
2036 | map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
2037 | while ((pos < map->len) && (map->queues[pos] != index)) | |
2038 | pos++; | |
2039 | ||
2040 | if (pos == map->len) | |
2041 | map->queues[map->len++] = index; | |
537c00de | 2042 | #ifdef CONFIG_NUMA |
537c00de AD |
2043 | if (numa_node_id == -2) |
2044 | numa_node_id = cpu_to_node(cpu); | |
2045 | else if (numa_node_id != cpu_to_node(cpu)) | |
2046 | numa_node_id = -1; | |
537c00de | 2047 | #endif |
01c5f864 AD |
2048 | } else if (dev_maps) { |
2049 | /* fill in the new device map from the old device map */ | |
2050 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
2051 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); | |
537c00de | 2052 | } |
01c5f864 | 2053 | |
537c00de AD |
2054 | } |
2055 | ||
01c5f864 AD |
2056 | rcu_assign_pointer(dev->xps_maps, new_dev_maps); |
2057 | ||
537c00de | 2058 | /* Cleanup old maps */ |
01c5f864 AD |
2059 | if (dev_maps) { |
2060 | for_each_possible_cpu(cpu) { | |
2061 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
2062 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
2063 | if (map && map != new_map) | |
2064 | kfree_rcu(map, rcu); | |
2065 | } | |
537c00de | 2066 | |
01c5f864 | 2067 | kfree_rcu(dev_maps, rcu); |
537c00de AD |
2068 | } |
2069 | ||
01c5f864 AD |
2070 | dev_maps = new_dev_maps; |
2071 | active = true; | |
537c00de | 2072 | |
01c5f864 AD |
2073 | out_no_new_maps: |
2074 | /* update Tx queue numa node */ | |
537c00de AD |
2075 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), |
2076 | (numa_node_id >= 0) ? numa_node_id : | |
2077 | NUMA_NO_NODE); | |
2078 | ||
01c5f864 AD |
2079 | if (!dev_maps) |
2080 | goto out_no_maps; | |
2081 | ||
2082 | /* removes queue from unused CPUs */ | |
2083 | for_each_possible_cpu(cpu) { | |
2084 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) | |
2085 | continue; | |
2086 | ||
2087 | if (remove_xps_queue(dev_maps, cpu, index)) | |
2088 | active = true; | |
2089 | } | |
2090 | ||
2091 | /* free map if not active */ | |
2092 | if (!active) { | |
2093 | RCU_INIT_POINTER(dev->xps_maps, NULL); | |
2094 | kfree_rcu(dev_maps, rcu); | |
2095 | } | |
2096 | ||
2097 | out_no_maps: | |
537c00de AD |
2098 | mutex_unlock(&xps_map_mutex); |
2099 | ||
2100 | return 0; | |
2101 | error: | |
01c5f864 AD |
2102 | /* remove any maps that we added */ |
2103 | for_each_possible_cpu(cpu) { | |
2104 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
2105 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : | |
2106 | NULL; | |
2107 | if (new_map && new_map != map) | |
2108 | kfree(new_map); | |
2109 | } | |
2110 | ||
537c00de AD |
2111 | mutex_unlock(&xps_map_mutex); |
2112 | ||
537c00de AD |
2113 | kfree(new_dev_maps); |
2114 | return -ENOMEM; | |
2115 | } | |
2116 | EXPORT_SYMBOL(netif_set_xps_queue); | |
2117 | ||
2118 | #endif | |
f0796d5c JF |
2119 | /* |
2120 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
2121 | * greater then real_num_tx_queues stale skbs on the qdisc must be flushed. | |
2122 | */ | |
e6484930 | 2123 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2124 | { |
1d24eb48 TH |
2125 | int rc; |
2126 | ||
e6484930 TH |
2127 | if (txq < 1 || txq > dev->num_tx_queues) |
2128 | return -EINVAL; | |
f0796d5c | 2129 | |
5c56580b BH |
2130 | if (dev->reg_state == NETREG_REGISTERED || |
2131 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2132 | ASSERT_RTNL(); |
2133 | ||
1d24eb48 TH |
2134 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2135 | txq); | |
bf264145 TH |
2136 | if (rc) |
2137 | return rc; | |
2138 | ||
4f57c087 JF |
2139 | if (dev->num_tc) |
2140 | netif_setup_tc(dev, txq); | |
2141 | ||
024e9679 | 2142 | if (txq < dev->real_num_tx_queues) { |
e6484930 | 2143 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2144 | #ifdef CONFIG_XPS |
2145 | netif_reset_xps_queues_gt(dev, txq); | |
2146 | #endif | |
2147 | } | |
f0796d5c | 2148 | } |
e6484930 TH |
2149 | |
2150 | dev->real_num_tx_queues = txq; | |
2151 | return 0; | |
f0796d5c JF |
2152 | } |
2153 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2154 | |
a953be53 | 2155 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
2156 | /** |
2157 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2158 | * @dev: Network device | |
2159 | * @rxq: Actual number of RX queues | |
2160 | * | |
2161 | * This must be called either with the rtnl_lock held or before | |
2162 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2163 | * negative error code. If called before registration, it always |
2164 | * succeeds. | |
62fe0b40 BH |
2165 | */ |
2166 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2167 | { | |
2168 | int rc; | |
2169 | ||
bd25fa7b TH |
2170 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2171 | return -EINVAL; | |
2172 | ||
62fe0b40 BH |
2173 | if (dev->reg_state == NETREG_REGISTERED) { |
2174 | ASSERT_RTNL(); | |
2175 | ||
62fe0b40 BH |
2176 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2177 | rxq); | |
2178 | if (rc) | |
2179 | return rc; | |
62fe0b40 BH |
2180 | } |
2181 | ||
2182 | dev->real_num_rx_queues = rxq; | |
2183 | return 0; | |
2184 | } | |
2185 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2186 | #endif | |
2187 | ||
2c53040f BH |
2188 | /** |
2189 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
2190 | * |
2191 | * This routine should set an upper limit on the number of RSS queues | |
2192 | * used by default by multiqueue devices. | |
2193 | */ | |
a55b138b | 2194 | int netif_get_num_default_rss_queues(void) |
16917b87 YM |
2195 | { |
2196 | return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
2197 | } | |
2198 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
2199 | ||
def82a1d | 2200 | static inline void __netif_reschedule(struct Qdisc *q) |
56079431 | 2201 | { |
def82a1d JP |
2202 | struct softnet_data *sd; |
2203 | unsigned long flags; | |
56079431 | 2204 | |
def82a1d | 2205 | local_irq_save(flags); |
903ceff7 | 2206 | sd = this_cpu_ptr(&softnet_data); |
a9cbd588 CG |
2207 | q->next_sched = NULL; |
2208 | *sd->output_queue_tailp = q; | |
2209 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
2210 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
2211 | local_irq_restore(flags); | |
2212 | } | |
2213 | ||
2214 | void __netif_schedule(struct Qdisc *q) | |
2215 | { | |
2216 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
2217 | __netif_reschedule(q); | |
56079431 DV |
2218 | } |
2219 | EXPORT_SYMBOL(__netif_schedule); | |
2220 | ||
e6247027 ED |
2221 | struct dev_kfree_skb_cb { |
2222 | enum skb_free_reason reason; | |
2223 | }; | |
2224 | ||
2225 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 2226 | { |
e6247027 ED |
2227 | return (struct dev_kfree_skb_cb *)skb->cb; |
2228 | } | |
2229 | ||
46e5da40 JF |
2230 | void netif_schedule_queue(struct netdev_queue *txq) |
2231 | { | |
2232 | rcu_read_lock(); | |
2233 | if (!(txq->state & QUEUE_STATE_ANY_XOFF)) { | |
2234 | struct Qdisc *q = rcu_dereference(txq->qdisc); | |
2235 | ||
2236 | __netif_schedule(q); | |
2237 | } | |
2238 | rcu_read_unlock(); | |
2239 | } | |
2240 | EXPORT_SYMBOL(netif_schedule_queue); | |
2241 | ||
2242 | /** | |
2243 | * netif_wake_subqueue - allow sending packets on subqueue | |
2244 | * @dev: network device | |
2245 | * @queue_index: sub queue index | |
2246 | * | |
2247 | * Resume individual transmit queue of a device with multiple transmit queues. | |
2248 | */ | |
2249 | void netif_wake_subqueue(struct net_device *dev, u16 queue_index) | |
2250 | { | |
2251 | struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); | |
2252 | ||
2253 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state)) { | |
2254 | struct Qdisc *q; | |
2255 | ||
2256 | rcu_read_lock(); | |
2257 | q = rcu_dereference(txq->qdisc); | |
2258 | __netif_schedule(q); | |
2259 | rcu_read_unlock(); | |
2260 | } | |
2261 | } | |
2262 | EXPORT_SYMBOL(netif_wake_subqueue); | |
2263 | ||
2264 | void netif_tx_wake_queue(struct netdev_queue *dev_queue) | |
2265 | { | |
2266 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { | |
2267 | struct Qdisc *q; | |
2268 | ||
2269 | rcu_read_lock(); | |
2270 | q = rcu_dereference(dev_queue->qdisc); | |
2271 | __netif_schedule(q); | |
2272 | rcu_read_unlock(); | |
2273 | } | |
2274 | } | |
2275 | EXPORT_SYMBOL(netif_tx_wake_queue); | |
2276 | ||
e6247027 | 2277 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 | 2278 | { |
e6247027 | 2279 | unsigned long flags; |
56079431 | 2280 | |
e6247027 ED |
2281 | if (likely(atomic_read(&skb->users) == 1)) { |
2282 | smp_rmb(); | |
2283 | atomic_set(&skb->users, 0); | |
2284 | } else if (likely(!atomic_dec_and_test(&skb->users))) { | |
2285 | return; | |
bea3348e | 2286 | } |
e6247027 ED |
2287 | get_kfree_skb_cb(skb)->reason = reason; |
2288 | local_irq_save(flags); | |
2289 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
2290 | __this_cpu_write(softnet_data.completion_queue, skb); | |
2291 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
2292 | local_irq_restore(flags); | |
56079431 | 2293 | } |
e6247027 | 2294 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 2295 | |
e6247027 | 2296 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
2297 | { |
2298 | if (in_irq() || irqs_disabled()) | |
e6247027 | 2299 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
2300 | else |
2301 | dev_kfree_skb(skb); | |
2302 | } | |
e6247027 | 2303 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
2304 | |
2305 | ||
bea3348e SH |
2306 | /** |
2307 | * netif_device_detach - mark device as removed | |
2308 | * @dev: network device | |
2309 | * | |
2310 | * Mark device as removed from system and therefore no longer available. | |
2311 | */ | |
56079431 DV |
2312 | void netif_device_detach(struct net_device *dev) |
2313 | { | |
2314 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2315 | netif_running(dev)) { | |
d543103a | 2316 | netif_tx_stop_all_queues(dev); |
56079431 DV |
2317 | } |
2318 | } | |
2319 | EXPORT_SYMBOL(netif_device_detach); | |
2320 | ||
bea3348e SH |
2321 | /** |
2322 | * netif_device_attach - mark device as attached | |
2323 | * @dev: network device | |
2324 | * | |
2325 | * Mark device as attached from system and restart if needed. | |
2326 | */ | |
56079431 DV |
2327 | void netif_device_attach(struct net_device *dev) |
2328 | { | |
2329 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2330 | netif_running(dev)) { | |
d543103a | 2331 | netif_tx_wake_all_queues(dev); |
4ec93edb | 2332 | __netdev_watchdog_up(dev); |
56079431 DV |
2333 | } |
2334 | } | |
2335 | EXPORT_SYMBOL(netif_device_attach); | |
2336 | ||
36c92474 BH |
2337 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
2338 | { | |
65e9d2fa | 2339 | static const netdev_features_t null_features = 0; |
36c92474 BH |
2340 | struct net_device *dev = skb->dev; |
2341 | const char *driver = ""; | |
2342 | ||
c846ad9b BG |
2343 | if (!net_ratelimit()) |
2344 | return; | |
2345 | ||
36c92474 BH |
2346 | if (dev && dev->dev.parent) |
2347 | driver = dev_driver_string(dev->dev.parent); | |
2348 | ||
2349 | WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d " | |
2350 | "gso_type=%d ip_summed=%d\n", | |
65e9d2fa MM |
2351 | driver, dev ? &dev->features : &null_features, |
2352 | skb->sk ? &skb->sk->sk_route_caps : &null_features, | |
36c92474 BH |
2353 | skb->len, skb->data_len, skb_shinfo(skb)->gso_size, |
2354 | skb_shinfo(skb)->gso_type, skb->ip_summed); | |
2355 | } | |
2356 | ||
1da177e4 LT |
2357 | /* |
2358 | * Invalidate hardware checksum when packet is to be mangled, and | |
2359 | * complete checksum manually on outgoing path. | |
2360 | */ | |
84fa7933 | 2361 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 2362 | { |
d3bc23e7 | 2363 | __wsum csum; |
663ead3b | 2364 | int ret = 0, offset; |
1da177e4 | 2365 | |
84fa7933 | 2366 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
2367 | goto out_set_summed; |
2368 | ||
2369 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
36c92474 BH |
2370 | skb_warn_bad_offload(skb); |
2371 | return -EINVAL; | |
1da177e4 LT |
2372 | } |
2373 | ||
cef401de ED |
2374 | /* Before computing a checksum, we should make sure no frag could |
2375 | * be modified by an external entity : checksum could be wrong. | |
2376 | */ | |
2377 | if (skb_has_shared_frag(skb)) { | |
2378 | ret = __skb_linearize(skb); | |
2379 | if (ret) | |
2380 | goto out; | |
2381 | } | |
2382 | ||
55508d60 | 2383 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
2384 | BUG_ON(offset >= skb_headlen(skb)); |
2385 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
2386 | ||
2387 | offset += skb->csum_offset; | |
2388 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
2389 | ||
2390 | if (skb_cloned(skb) && | |
2391 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
2392 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
2393 | if (ret) | |
2394 | goto out; | |
2395 | } | |
2396 | ||
a030847e | 2397 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
a430a43d | 2398 | out_set_summed: |
1da177e4 | 2399 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 2400 | out: |
1da177e4 LT |
2401 | return ret; |
2402 | } | |
d1b19dff | 2403 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 2404 | |
53d6471c | 2405 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 2406 | { |
252e3346 | 2407 | __be16 type = skb->protocol; |
f6a78bfc | 2408 | |
19acc327 PS |
2409 | /* Tunnel gso handlers can set protocol to ethernet. */ |
2410 | if (type == htons(ETH_P_TEB)) { | |
2411 | struct ethhdr *eth; | |
2412 | ||
2413 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
2414 | return 0; | |
2415 | ||
2416 | eth = (struct ethhdr *)skb_mac_header(skb); | |
2417 | type = eth->h_proto; | |
2418 | } | |
2419 | ||
d4bcef3f | 2420 | return __vlan_get_protocol(skb, type, depth); |
ec5f0615 PS |
2421 | } |
2422 | ||
2423 | /** | |
2424 | * skb_mac_gso_segment - mac layer segmentation handler. | |
2425 | * @skb: buffer to segment | |
2426 | * @features: features for the output path (see dev->features) | |
2427 | */ | |
2428 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
2429 | netdev_features_t features) | |
2430 | { | |
2431 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
2432 | struct packet_offload *ptype; | |
53d6471c VY |
2433 | int vlan_depth = skb->mac_len; |
2434 | __be16 type = skb_network_protocol(skb, &vlan_depth); | |
ec5f0615 PS |
2435 | |
2436 | if (unlikely(!type)) | |
2437 | return ERR_PTR(-EINVAL); | |
2438 | ||
53d6471c | 2439 | __skb_pull(skb, vlan_depth); |
f6a78bfc HX |
2440 | |
2441 | rcu_read_lock(); | |
22061d80 | 2442 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 2443 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
f191a1d1 | 2444 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
2445 | break; |
2446 | } | |
2447 | } | |
2448 | rcu_read_unlock(); | |
2449 | ||
98e399f8 | 2450 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 2451 | |
f6a78bfc HX |
2452 | return segs; |
2453 | } | |
05e8ef4a PS |
2454 | EXPORT_SYMBOL(skb_mac_gso_segment); |
2455 | ||
2456 | ||
2457 | /* openvswitch calls this on rx path, so we need a different check. | |
2458 | */ | |
2459 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
2460 | { | |
2461 | if (tx_path) | |
2462 | return skb->ip_summed != CHECKSUM_PARTIAL; | |
2463 | else | |
2464 | return skb->ip_summed == CHECKSUM_NONE; | |
2465 | } | |
2466 | ||
2467 | /** | |
2468 | * __skb_gso_segment - Perform segmentation on skb. | |
2469 | * @skb: buffer to segment | |
2470 | * @features: features for the output path (see dev->features) | |
2471 | * @tx_path: whether it is called in TX path | |
2472 | * | |
2473 | * This function segments the given skb and returns a list of segments. | |
2474 | * | |
2475 | * It may return NULL if the skb requires no segmentation. This is | |
2476 | * only possible when GSO is used for verifying header integrity. | |
2477 | */ | |
2478 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
2479 | netdev_features_t features, bool tx_path) | |
2480 | { | |
2481 | if (unlikely(skb_needs_check(skb, tx_path))) { | |
2482 | int err; | |
2483 | ||
2484 | skb_warn_bad_offload(skb); | |
2485 | ||
a40e0a66 | 2486 | err = skb_cow_head(skb, 0); |
2487 | if (err < 0) | |
05e8ef4a PS |
2488 | return ERR_PTR(err); |
2489 | } | |
2490 | ||
68c33163 | 2491 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
2492 | SKB_GSO_CB(skb)->encap_level = 0; |
2493 | ||
05e8ef4a PS |
2494 | skb_reset_mac_header(skb); |
2495 | skb_reset_mac_len(skb); | |
2496 | ||
2497 | return skb_mac_gso_segment(skb, features); | |
2498 | } | |
12b0004d | 2499 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 2500 | |
fb286bb2 HX |
2501 | /* Take action when hardware reception checksum errors are detected. */ |
2502 | #ifdef CONFIG_BUG | |
2503 | void netdev_rx_csum_fault(struct net_device *dev) | |
2504 | { | |
2505 | if (net_ratelimit()) { | |
7b6cd1ce | 2506 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
2507 | dump_stack(); |
2508 | } | |
2509 | } | |
2510 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
2511 | #endif | |
2512 | ||
1da177e4 LT |
2513 | /* Actually, we should eliminate this check as soon as we know, that: |
2514 | * 1. IOMMU is present and allows to map all the memory. | |
2515 | * 2. No high memory really exists on this machine. | |
2516 | */ | |
2517 | ||
c1e756bf | 2518 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 2519 | { |
3d3a8533 | 2520 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 2521 | int i; |
5acbbd42 | 2522 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
2523 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
2524 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
2525 | if (PageHighMem(skb_frag_page(frag))) | |
5acbbd42 | 2526 | return 1; |
ea2ab693 | 2527 | } |
5acbbd42 | 2528 | } |
1da177e4 | 2529 | |
5acbbd42 FT |
2530 | if (PCI_DMA_BUS_IS_PHYS) { |
2531 | struct device *pdev = dev->dev.parent; | |
1da177e4 | 2532 | |
9092c658 ED |
2533 | if (!pdev) |
2534 | return 0; | |
5acbbd42 | 2535 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
ea2ab693 IC |
2536 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
2537 | dma_addr_t addr = page_to_phys(skb_frag_page(frag)); | |
5acbbd42 FT |
2538 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
2539 | return 1; | |
2540 | } | |
2541 | } | |
3d3a8533 | 2542 | #endif |
1da177e4 LT |
2543 | return 0; |
2544 | } | |
1da177e4 | 2545 | |
3b392ddb SH |
2546 | /* If MPLS offload request, verify we are testing hardware MPLS features |
2547 | * instead of standard features for the netdev. | |
2548 | */ | |
d0edc7bf | 2549 | #if IS_ENABLED(CONFIG_NET_MPLS_GSO) |
3b392ddb SH |
2550 | static netdev_features_t net_mpls_features(struct sk_buff *skb, |
2551 | netdev_features_t features, | |
2552 | __be16 type) | |
2553 | { | |
25cd9ba0 | 2554 | if (eth_p_mpls(type)) |
3b392ddb SH |
2555 | features &= skb->dev->mpls_features; |
2556 | ||
2557 | return features; | |
2558 | } | |
2559 | #else | |
2560 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
2561 | netdev_features_t features, | |
2562 | __be16 type) | |
2563 | { | |
2564 | return features; | |
2565 | } | |
2566 | #endif | |
2567 | ||
c8f44aff | 2568 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 2569 | netdev_features_t features) |
f01a5236 | 2570 | { |
53d6471c | 2571 | int tmp; |
3b392ddb SH |
2572 | __be16 type; |
2573 | ||
2574 | type = skb_network_protocol(skb, &tmp); | |
2575 | features = net_mpls_features(skb, features, type); | |
53d6471c | 2576 | |
c0d680e5 | 2577 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 2578 | !can_checksum_protocol(features, type)) { |
f01a5236 | 2579 | features &= ~NETIF_F_ALL_CSUM; |
c1e756bf | 2580 | } else if (illegal_highdma(skb->dev, skb)) { |
f01a5236 JG |
2581 | features &= ~NETIF_F_SG; |
2582 | } | |
2583 | ||
2584 | return features; | |
2585 | } | |
2586 | ||
e38f3025 TM |
2587 | netdev_features_t passthru_features_check(struct sk_buff *skb, |
2588 | struct net_device *dev, | |
2589 | netdev_features_t features) | |
2590 | { | |
2591 | return features; | |
2592 | } | |
2593 | EXPORT_SYMBOL(passthru_features_check); | |
2594 | ||
8cb65d00 TM |
2595 | static netdev_features_t dflt_features_check(const struct sk_buff *skb, |
2596 | struct net_device *dev, | |
2597 | netdev_features_t features) | |
2598 | { | |
2599 | return vlan_features_check(skb, features); | |
2600 | } | |
2601 | ||
c1e756bf | 2602 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 | 2603 | { |
5f35227e | 2604 | struct net_device *dev = skb->dev; |
fcbeb976 ED |
2605 | netdev_features_t features = dev->features; |
2606 | u16 gso_segs = skb_shinfo(skb)->gso_segs; | |
58e998c6 | 2607 | |
fcbeb976 | 2608 | if (gso_segs > dev->gso_max_segs || gso_segs < dev->gso_min_segs) |
30b678d8 BH |
2609 | features &= ~NETIF_F_GSO_MASK; |
2610 | ||
5f35227e JG |
2611 | /* If encapsulation offload request, verify we are testing |
2612 | * hardware encapsulation features instead of standard | |
2613 | * features for the netdev | |
2614 | */ | |
2615 | if (skb->encapsulation) | |
2616 | features &= dev->hw_enc_features; | |
2617 | ||
f5a7fb88 TM |
2618 | if (skb_vlan_tagged(skb)) |
2619 | features = netdev_intersect_features(features, | |
2620 | dev->vlan_features | | |
2621 | NETIF_F_HW_VLAN_CTAG_TX | | |
2622 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 2623 | |
5f35227e JG |
2624 | if (dev->netdev_ops->ndo_features_check) |
2625 | features &= dev->netdev_ops->ndo_features_check(skb, dev, | |
2626 | features); | |
8cb65d00 TM |
2627 | else |
2628 | features &= dflt_features_check(skb, dev, features); | |
5f35227e | 2629 | |
c1e756bf | 2630 | return harmonize_features(skb, features); |
58e998c6 | 2631 | } |
c1e756bf | 2632 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 2633 | |
2ea25513 | 2634 | static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
95f6b3dd | 2635 | struct netdev_queue *txq, bool more) |
f6a78bfc | 2636 | { |
2ea25513 DM |
2637 | unsigned int len; |
2638 | int rc; | |
00829823 | 2639 | |
7866a621 | 2640 | if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all)) |
2ea25513 | 2641 | dev_queue_xmit_nit(skb, dev); |
fc741216 | 2642 | |
2ea25513 DM |
2643 | len = skb->len; |
2644 | trace_net_dev_start_xmit(skb, dev); | |
95f6b3dd | 2645 | rc = netdev_start_xmit(skb, dev, txq, more); |
2ea25513 | 2646 | trace_net_dev_xmit(skb, rc, dev, len); |
adf30907 | 2647 | |
2ea25513 DM |
2648 | return rc; |
2649 | } | |
7b9c6090 | 2650 | |
8dcda22a DM |
2651 | struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
2652 | struct netdev_queue *txq, int *ret) | |
7f2e870f DM |
2653 | { |
2654 | struct sk_buff *skb = first; | |
2655 | int rc = NETDEV_TX_OK; | |
7b9c6090 | 2656 | |
7f2e870f DM |
2657 | while (skb) { |
2658 | struct sk_buff *next = skb->next; | |
fc70fb64 | 2659 | |
7f2e870f | 2660 | skb->next = NULL; |
95f6b3dd | 2661 | rc = xmit_one(skb, dev, txq, next != NULL); |
7f2e870f DM |
2662 | if (unlikely(!dev_xmit_complete(rc))) { |
2663 | skb->next = next; | |
2664 | goto out; | |
2665 | } | |
6afff0ca | 2666 | |
7f2e870f DM |
2667 | skb = next; |
2668 | if (netif_xmit_stopped(txq) && skb) { | |
2669 | rc = NETDEV_TX_BUSY; | |
2670 | break; | |
9ccb8975 | 2671 | } |
7f2e870f | 2672 | } |
9ccb8975 | 2673 | |
7f2e870f DM |
2674 | out: |
2675 | *ret = rc; | |
2676 | return skb; | |
2677 | } | |
b40863c6 | 2678 | |
1ff0dc94 ED |
2679 | static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
2680 | netdev_features_t features) | |
f6a78bfc | 2681 | { |
df8a39de | 2682 | if (skb_vlan_tag_present(skb) && |
5968250c JP |
2683 | !vlan_hw_offload_capable(features, skb->vlan_proto)) |
2684 | skb = __vlan_hwaccel_push_inside(skb); | |
eae3f88e DM |
2685 | return skb; |
2686 | } | |
f6a78bfc | 2687 | |
55a93b3e | 2688 | static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev) |
eae3f88e DM |
2689 | { |
2690 | netdev_features_t features; | |
f6a78bfc | 2691 | |
eae3f88e DM |
2692 | if (skb->next) |
2693 | return skb; | |
068a2de5 | 2694 | |
eae3f88e DM |
2695 | features = netif_skb_features(skb); |
2696 | skb = validate_xmit_vlan(skb, features); | |
2697 | if (unlikely(!skb)) | |
2698 | goto out_null; | |
7b9c6090 | 2699 | |
04ffcb25 | 2700 | if (netif_needs_gso(dev, skb, features)) { |
ce93718f DM |
2701 | struct sk_buff *segs; |
2702 | ||
2703 | segs = skb_gso_segment(skb, features); | |
cecda693 | 2704 | if (IS_ERR(segs)) { |
af6dabc9 | 2705 | goto out_kfree_skb; |
cecda693 JW |
2706 | } else if (segs) { |
2707 | consume_skb(skb); | |
2708 | skb = segs; | |
f6a78bfc | 2709 | } |
eae3f88e DM |
2710 | } else { |
2711 | if (skb_needs_linearize(skb, features) && | |
2712 | __skb_linearize(skb)) | |
2713 | goto out_kfree_skb; | |
4ec93edb | 2714 | |
eae3f88e DM |
2715 | /* If packet is not checksummed and device does not |
2716 | * support checksumming for this protocol, complete | |
2717 | * checksumming here. | |
2718 | */ | |
2719 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
2720 | if (skb->encapsulation) | |
2721 | skb_set_inner_transport_header(skb, | |
2722 | skb_checksum_start_offset(skb)); | |
2723 | else | |
2724 | skb_set_transport_header(skb, | |
2725 | skb_checksum_start_offset(skb)); | |
2726 | if (!(features & NETIF_F_ALL_CSUM) && | |
2727 | skb_checksum_help(skb)) | |
2728 | goto out_kfree_skb; | |
7b9c6090 | 2729 | } |
0c772159 | 2730 | } |
7b9c6090 | 2731 | |
eae3f88e | 2732 | return skb; |
fc70fb64 | 2733 | |
f6a78bfc HX |
2734 | out_kfree_skb: |
2735 | kfree_skb(skb); | |
eae3f88e DM |
2736 | out_null: |
2737 | return NULL; | |
2738 | } | |
6afff0ca | 2739 | |
55a93b3e ED |
2740 | struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev) |
2741 | { | |
2742 | struct sk_buff *next, *head = NULL, *tail; | |
2743 | ||
bec3cfdc | 2744 | for (; skb != NULL; skb = next) { |
55a93b3e ED |
2745 | next = skb->next; |
2746 | skb->next = NULL; | |
bec3cfdc ED |
2747 | |
2748 | /* in case skb wont be segmented, point to itself */ | |
2749 | skb->prev = skb; | |
2750 | ||
55a93b3e | 2751 | skb = validate_xmit_skb(skb, dev); |
bec3cfdc ED |
2752 | if (!skb) |
2753 | continue; | |
55a93b3e | 2754 | |
bec3cfdc ED |
2755 | if (!head) |
2756 | head = skb; | |
2757 | else | |
2758 | tail->next = skb; | |
2759 | /* If skb was segmented, skb->prev points to | |
2760 | * the last segment. If not, it still contains skb. | |
2761 | */ | |
2762 | tail = skb->prev; | |
55a93b3e ED |
2763 | } |
2764 | return head; | |
f6a78bfc HX |
2765 | } |
2766 | ||
1def9238 ED |
2767 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
2768 | { | |
2769 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
2770 | ||
2771 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
2772 | ||
2773 | /* To get more precise estimation of bytes sent on wire, | |
2774 | * we add to pkt_len the headers size of all segments | |
2775 | */ | |
2776 | if (shinfo->gso_size) { | |
757b8b1d | 2777 | unsigned int hdr_len; |
15e5a030 | 2778 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 2779 | |
757b8b1d ED |
2780 | /* mac layer + network layer */ |
2781 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
2782 | ||
2783 | /* + transport layer */ | |
1def9238 ED |
2784 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) |
2785 | hdr_len += tcp_hdrlen(skb); | |
2786 | else | |
2787 | hdr_len += sizeof(struct udphdr); | |
15e5a030 JW |
2788 | |
2789 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
2790 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
2791 | shinfo->gso_size); | |
2792 | ||
2793 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
2794 | } |
2795 | } | |
2796 | ||
bbd8a0d3 KK |
2797 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
2798 | struct net_device *dev, | |
2799 | struct netdev_queue *txq) | |
2800 | { | |
2801 | spinlock_t *root_lock = qdisc_lock(q); | |
a2da570d | 2802 | bool contended; |
bbd8a0d3 KK |
2803 | int rc; |
2804 | ||
1def9238 | 2805 | qdisc_pkt_len_init(skb); |
a2da570d | 2806 | qdisc_calculate_pkt_len(skb, q); |
79640a4c ED |
2807 | /* |
2808 | * Heuristic to force contended enqueues to serialize on a | |
2809 | * separate lock before trying to get qdisc main lock. | |
9bf2b8c2 YX |
2810 | * This permits __QDISC___STATE_RUNNING owner to get the lock more |
2811 | * often and dequeue packets faster. | |
79640a4c | 2812 | */ |
a2da570d | 2813 | contended = qdisc_is_running(q); |
79640a4c ED |
2814 | if (unlikely(contended)) |
2815 | spin_lock(&q->busylock); | |
2816 | ||
bbd8a0d3 KK |
2817 | spin_lock(root_lock); |
2818 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
2819 | kfree_skb(skb); | |
2820 | rc = NET_XMIT_DROP; | |
2821 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 2822 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
2823 | /* |
2824 | * This is a work-conserving queue; there are no old skbs | |
2825 | * waiting to be sent out; and the qdisc is not running - | |
2826 | * xmit the skb directly. | |
2827 | */ | |
bfe0d029 | 2828 | |
bfe0d029 ED |
2829 | qdisc_bstats_update(q, skb); |
2830 | ||
55a93b3e | 2831 | if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
79640a4c ED |
2832 | if (unlikely(contended)) { |
2833 | spin_unlock(&q->busylock); | |
2834 | contended = false; | |
2835 | } | |
bbd8a0d3 | 2836 | __qdisc_run(q); |
79640a4c | 2837 | } else |
bc135b23 | 2838 | qdisc_run_end(q); |
bbd8a0d3 KK |
2839 | |
2840 | rc = NET_XMIT_SUCCESS; | |
2841 | } else { | |
a2da570d | 2842 | rc = q->enqueue(skb, q) & NET_XMIT_MASK; |
79640a4c ED |
2843 | if (qdisc_run_begin(q)) { |
2844 | if (unlikely(contended)) { | |
2845 | spin_unlock(&q->busylock); | |
2846 | contended = false; | |
2847 | } | |
2848 | __qdisc_run(q); | |
2849 | } | |
bbd8a0d3 KK |
2850 | } |
2851 | spin_unlock(root_lock); | |
79640a4c ED |
2852 | if (unlikely(contended)) |
2853 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
2854 | return rc; |
2855 | } | |
2856 | ||
86f8515f | 2857 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
2858 | static void skb_update_prio(struct sk_buff *skb) |
2859 | { | |
6977a79d | 2860 | struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap); |
5bc1421e | 2861 | |
91c68ce2 ED |
2862 | if (!skb->priority && skb->sk && map) { |
2863 | unsigned int prioidx = skb->sk->sk_cgrp_prioidx; | |
2864 | ||
2865 | if (prioidx < map->priomap_len) | |
2866 | skb->priority = map->priomap[prioidx]; | |
2867 | } | |
5bc1421e NH |
2868 | } |
2869 | #else | |
2870 | #define skb_update_prio(skb) | |
2871 | #endif | |
2872 | ||
f60e5990 | 2873 | DEFINE_PER_CPU(int, xmit_recursion); |
2874 | EXPORT_SYMBOL(xmit_recursion); | |
2875 | ||
11a766ce | 2876 | #define RECURSION_LIMIT 10 |
745e20f1 | 2877 | |
95603e22 MM |
2878 | /** |
2879 | * dev_loopback_xmit - loop back @skb | |
2880 | * @skb: buffer to transmit | |
2881 | */ | |
7026b1dd | 2882 | int dev_loopback_xmit(struct sock *sk, struct sk_buff *skb) |
95603e22 MM |
2883 | { |
2884 | skb_reset_mac_header(skb); | |
2885 | __skb_pull(skb, skb_network_offset(skb)); | |
2886 | skb->pkt_type = PACKET_LOOPBACK; | |
2887 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2888 | WARN_ON(!skb_dst(skb)); | |
2889 | skb_dst_force(skb); | |
2890 | netif_rx_ni(skb); | |
2891 | return 0; | |
2892 | } | |
2893 | EXPORT_SYMBOL(dev_loopback_xmit); | |
2894 | ||
d29f749e | 2895 | /** |
9d08dd3d | 2896 | * __dev_queue_xmit - transmit a buffer |
d29f749e | 2897 | * @skb: buffer to transmit |
9d08dd3d | 2898 | * @accel_priv: private data used for L2 forwarding offload |
d29f749e DJ |
2899 | * |
2900 | * Queue a buffer for transmission to a network device. The caller must | |
2901 | * have set the device and priority and built the buffer before calling | |
2902 | * this function. The function can be called from an interrupt. | |
2903 | * | |
2904 | * A negative errno code is returned on a failure. A success does not | |
2905 | * guarantee the frame will be transmitted as it may be dropped due | |
2906 | * to congestion or traffic shaping. | |
2907 | * | |
2908 | * ----------------------------------------------------------------------------------- | |
2909 | * I notice this method can also return errors from the queue disciplines, | |
2910 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
2911 | * be positive. | |
2912 | * | |
2913 | * Regardless of the return value, the skb is consumed, so it is currently | |
2914 | * difficult to retry a send to this method. (You can bump the ref count | |
2915 | * before sending to hold a reference for retry if you are careful.) | |
2916 | * | |
2917 | * When calling this method, interrupts MUST be enabled. This is because | |
2918 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
2919 | * --BLG | |
2920 | */ | |
0a59f3a9 | 2921 | static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) |
1da177e4 LT |
2922 | { |
2923 | struct net_device *dev = skb->dev; | |
dc2b4847 | 2924 | struct netdev_queue *txq; |
1da177e4 LT |
2925 | struct Qdisc *q; |
2926 | int rc = -ENOMEM; | |
2927 | ||
6d1ccff6 ED |
2928 | skb_reset_mac_header(skb); |
2929 | ||
e7fd2885 WB |
2930 | if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
2931 | __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); | |
2932 | ||
4ec93edb YH |
2933 | /* Disable soft irqs for various locks below. Also |
2934 | * stops preemption for RCU. | |
1da177e4 | 2935 | */ |
4ec93edb | 2936 | rcu_read_lock_bh(); |
1da177e4 | 2937 | |
5bc1421e NH |
2938 | skb_update_prio(skb); |
2939 | ||
02875878 ED |
2940 | /* If device/qdisc don't need skb->dst, release it right now while |
2941 | * its hot in this cpu cache. | |
2942 | */ | |
2943 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
2944 | skb_dst_drop(skb); | |
2945 | else | |
2946 | skb_dst_force(skb); | |
2947 | ||
f663dd9a | 2948 | txq = netdev_pick_tx(dev, skb, accel_priv); |
a898def2 | 2949 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 2950 | |
1da177e4 | 2951 | #ifdef CONFIG_NET_CLS_ACT |
d1b19dff | 2952 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
1da177e4 | 2953 | #endif |
cf66ba58 | 2954 | trace_net_dev_queue(skb); |
1da177e4 | 2955 | if (q->enqueue) { |
bbd8a0d3 | 2956 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 2957 | goto out; |
1da177e4 LT |
2958 | } |
2959 | ||
2960 | /* The device has no queue. Common case for software devices: | |
2961 | loopback, all the sorts of tunnels... | |
2962 | ||
932ff279 HX |
2963 | Really, it is unlikely that netif_tx_lock protection is necessary |
2964 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
2965 | counters.) |
2966 | However, it is possible, that they rely on protection | |
2967 | made by us here. | |
2968 | ||
2969 | Check this and shot the lock. It is not prone from deadlocks. | |
2970 | Either shot noqueue qdisc, it is even simpler 8) | |
2971 | */ | |
2972 | if (dev->flags & IFF_UP) { | |
2973 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
2974 | ||
c773e847 | 2975 | if (txq->xmit_lock_owner != cpu) { |
1da177e4 | 2976 | |
745e20f1 ED |
2977 | if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT) |
2978 | goto recursion_alert; | |
2979 | ||
1f59533f JDB |
2980 | skb = validate_xmit_skb(skb, dev); |
2981 | if (!skb) | |
2982 | goto drop; | |
2983 | ||
c773e847 | 2984 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 2985 | |
73466498 | 2986 | if (!netif_xmit_stopped(txq)) { |
745e20f1 | 2987 | __this_cpu_inc(xmit_recursion); |
ce93718f | 2988 | skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
745e20f1 | 2989 | __this_cpu_dec(xmit_recursion); |
572a9d7b | 2990 | if (dev_xmit_complete(rc)) { |
c773e847 | 2991 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
2992 | goto out; |
2993 | } | |
2994 | } | |
c773e847 | 2995 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
2996 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
2997 | dev->name); | |
1da177e4 LT |
2998 | } else { |
2999 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
3000 | * unfortunately |
3001 | */ | |
3002 | recursion_alert: | |
e87cc472 JP |
3003 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
3004 | dev->name); | |
1da177e4 LT |
3005 | } |
3006 | } | |
3007 | ||
3008 | rc = -ENETDOWN; | |
1f59533f | 3009 | drop: |
d4828d85 | 3010 | rcu_read_unlock_bh(); |
1da177e4 | 3011 | |
015f0688 | 3012 | atomic_long_inc(&dev->tx_dropped); |
1f59533f | 3013 | kfree_skb_list(skb); |
1da177e4 LT |
3014 | return rc; |
3015 | out: | |
d4828d85 | 3016 | rcu_read_unlock_bh(); |
1da177e4 LT |
3017 | return rc; |
3018 | } | |
f663dd9a | 3019 | |
7026b1dd | 3020 | int dev_queue_xmit_sk(struct sock *sk, struct sk_buff *skb) |
f663dd9a JW |
3021 | { |
3022 | return __dev_queue_xmit(skb, NULL); | |
3023 | } | |
7026b1dd | 3024 | EXPORT_SYMBOL(dev_queue_xmit_sk); |
1da177e4 | 3025 | |
f663dd9a JW |
3026 | int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv) |
3027 | { | |
3028 | return __dev_queue_xmit(skb, accel_priv); | |
3029 | } | |
3030 | EXPORT_SYMBOL(dev_queue_xmit_accel); | |
3031 | ||
1da177e4 LT |
3032 | |
3033 | /*======================================================================= | |
3034 | Receiver routines | |
3035 | =======================================================================*/ | |
3036 | ||
6b2bedc3 | 3037 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
3038 | EXPORT_SYMBOL(netdev_max_backlog); |
3039 | ||
3b098e2d | 3040 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 SH |
3041 | int netdev_budget __read_mostly = 300; |
3042 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 | 3043 | |
eecfd7c4 ED |
3044 | /* Called with irq disabled */ |
3045 | static inline void ____napi_schedule(struct softnet_data *sd, | |
3046 | struct napi_struct *napi) | |
3047 | { | |
3048 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
3049 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3050 | } | |
3051 | ||
bfb564e7 KK |
3052 | #ifdef CONFIG_RPS |
3053 | ||
3054 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 3055 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 | 3056 | EXPORT_SYMBOL(rps_sock_flow_table); |
567e4b79 ED |
3057 | u32 rps_cpu_mask __read_mostly; |
3058 | EXPORT_SYMBOL(rps_cpu_mask); | |
bfb564e7 | 3059 | |
c5905afb | 3060 | struct static_key rps_needed __read_mostly; |
adc9300e | 3061 | |
c445477d BH |
3062 | static struct rps_dev_flow * |
3063 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3064 | struct rps_dev_flow *rflow, u16 next_cpu) | |
3065 | { | |
09994d1b | 3066 | if (next_cpu != RPS_NO_CPU) { |
c445477d BH |
3067 | #ifdef CONFIG_RFS_ACCEL |
3068 | struct netdev_rx_queue *rxqueue; | |
3069 | struct rps_dev_flow_table *flow_table; | |
3070 | struct rps_dev_flow *old_rflow; | |
3071 | u32 flow_id; | |
3072 | u16 rxq_index; | |
3073 | int rc; | |
3074 | ||
3075 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
3076 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
3077 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
3078 | goto out; |
3079 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
3080 | if (rxq_index == skb_get_rx_queue(skb)) | |
3081 | goto out; | |
3082 | ||
3083 | rxqueue = dev->_rx + rxq_index; | |
3084 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3085 | if (!flow_table) | |
3086 | goto out; | |
61b905da | 3087 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
3088 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
3089 | rxq_index, flow_id); | |
3090 | if (rc < 0) | |
3091 | goto out; | |
3092 | old_rflow = rflow; | |
3093 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
3094 | rflow->filter = rc; |
3095 | if (old_rflow->filter == rflow->filter) | |
3096 | old_rflow->filter = RPS_NO_FILTER; | |
3097 | out: | |
3098 | #endif | |
3099 | rflow->last_qtail = | |
09994d1b | 3100 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
3101 | } |
3102 | ||
09994d1b | 3103 | rflow->cpu = next_cpu; |
c445477d BH |
3104 | return rflow; |
3105 | } | |
3106 | ||
bfb564e7 KK |
3107 | /* |
3108 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
3109 | * CPU from the RPS map of the receiving queue for a given skb. | |
3110 | * rcu_read_lock must be held on entry. | |
3111 | */ | |
3112 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3113 | struct rps_dev_flow **rflowp) | |
3114 | { | |
567e4b79 ED |
3115 | const struct rps_sock_flow_table *sock_flow_table; |
3116 | struct netdev_rx_queue *rxqueue = dev->_rx; | |
bfb564e7 | 3117 | struct rps_dev_flow_table *flow_table; |
567e4b79 | 3118 | struct rps_map *map; |
bfb564e7 | 3119 | int cpu = -1; |
567e4b79 | 3120 | u32 tcpu; |
61b905da | 3121 | u32 hash; |
bfb564e7 KK |
3122 | |
3123 | if (skb_rx_queue_recorded(skb)) { | |
3124 | u16 index = skb_get_rx_queue(skb); | |
567e4b79 | 3125 | |
62fe0b40 BH |
3126 | if (unlikely(index >= dev->real_num_rx_queues)) { |
3127 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
3128 | "%s received packet on queue %u, but number " | |
3129 | "of RX queues is %u\n", | |
3130 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
3131 | goto done; |
3132 | } | |
567e4b79 ED |
3133 | rxqueue += index; |
3134 | } | |
bfb564e7 | 3135 | |
567e4b79 ED |
3136 | /* Avoid computing hash if RFS/RPS is not active for this rxqueue */ |
3137 | ||
3138 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
6e3f7faf | 3139 | map = rcu_dereference(rxqueue->rps_map); |
567e4b79 | 3140 | if (!flow_table && !map) |
bfb564e7 KK |
3141 | goto done; |
3142 | ||
2d47b459 | 3143 | skb_reset_network_header(skb); |
61b905da TH |
3144 | hash = skb_get_hash(skb); |
3145 | if (!hash) | |
bfb564e7 KK |
3146 | goto done; |
3147 | ||
fec5e652 TH |
3148 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
3149 | if (flow_table && sock_flow_table) { | |
fec5e652 | 3150 | struct rps_dev_flow *rflow; |
567e4b79 ED |
3151 | u32 next_cpu; |
3152 | u32 ident; | |
3153 | ||
3154 | /* First check into global flow table if there is a match */ | |
3155 | ident = sock_flow_table->ents[hash & sock_flow_table->mask]; | |
3156 | if ((ident ^ hash) & ~rps_cpu_mask) | |
3157 | goto try_rps; | |
fec5e652 | 3158 | |
567e4b79 ED |
3159 | next_cpu = ident & rps_cpu_mask; |
3160 | ||
3161 | /* OK, now we know there is a match, | |
3162 | * we can look at the local (per receive queue) flow table | |
3163 | */ | |
61b905da | 3164 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
3165 | tcpu = rflow->cpu; |
3166 | ||
fec5e652 TH |
3167 | /* |
3168 | * If the desired CPU (where last recvmsg was done) is | |
3169 | * different from current CPU (one in the rx-queue flow | |
3170 | * table entry), switch if one of the following holds: | |
3171 | * - Current CPU is unset (equal to RPS_NO_CPU). | |
3172 | * - Current CPU is offline. | |
3173 | * - The current CPU's queue tail has advanced beyond the | |
3174 | * last packet that was enqueued using this table entry. | |
3175 | * This guarantees that all previous packets for the flow | |
3176 | * have been dequeued, thus preserving in order delivery. | |
3177 | */ | |
3178 | if (unlikely(tcpu != next_cpu) && | |
3179 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || | |
3180 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - | |
baefa31d TH |
3181 | rflow->last_qtail)) >= 0)) { |
3182 | tcpu = next_cpu; | |
c445477d | 3183 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 3184 | } |
c445477d | 3185 | |
fec5e652 TH |
3186 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
3187 | *rflowp = rflow; | |
3188 | cpu = tcpu; | |
3189 | goto done; | |
3190 | } | |
3191 | } | |
3192 | ||
567e4b79 ED |
3193 | try_rps: |
3194 | ||
0a9627f2 | 3195 | if (map) { |
8fc54f68 | 3196 | tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
0a9627f2 TH |
3197 | if (cpu_online(tcpu)) { |
3198 | cpu = tcpu; | |
3199 | goto done; | |
3200 | } | |
3201 | } | |
3202 | ||
3203 | done: | |
0a9627f2 TH |
3204 | return cpu; |
3205 | } | |
3206 | ||
c445477d BH |
3207 | #ifdef CONFIG_RFS_ACCEL |
3208 | ||
3209 | /** | |
3210 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
3211 | * @dev: Device on which the filter was set | |
3212 | * @rxq_index: RX queue index | |
3213 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
3214 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
3215 | * | |
3216 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
3217 | * this function for each installed filter and remove the filters for | |
3218 | * which it returns %true. | |
3219 | */ | |
3220 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
3221 | u32 flow_id, u16 filter_id) | |
3222 | { | |
3223 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
3224 | struct rps_dev_flow_table *flow_table; | |
3225 | struct rps_dev_flow *rflow; | |
3226 | bool expire = true; | |
3227 | int cpu; | |
3228 | ||
3229 | rcu_read_lock(); | |
3230 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3231 | if (flow_table && flow_id <= flow_table->mask) { | |
3232 | rflow = &flow_table->flows[flow_id]; | |
3233 | cpu = ACCESS_ONCE(rflow->cpu); | |
3234 | if (rflow->filter == filter_id && cpu != RPS_NO_CPU && | |
3235 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - | |
3236 | rflow->last_qtail) < | |
3237 | (int)(10 * flow_table->mask))) | |
3238 | expire = false; | |
3239 | } | |
3240 | rcu_read_unlock(); | |
3241 | return expire; | |
3242 | } | |
3243 | EXPORT_SYMBOL(rps_may_expire_flow); | |
3244 | ||
3245 | #endif /* CONFIG_RFS_ACCEL */ | |
3246 | ||
0a9627f2 | 3247 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 3248 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 3249 | { |
e36fa2f7 ED |
3250 | struct softnet_data *sd = data; |
3251 | ||
eecfd7c4 | 3252 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 3253 | sd->received_rps++; |
0a9627f2 | 3254 | } |
e36fa2f7 | 3255 | |
fec5e652 | 3256 | #endif /* CONFIG_RPS */ |
0a9627f2 | 3257 | |
e36fa2f7 ED |
3258 | /* |
3259 | * Check if this softnet_data structure is another cpu one | |
3260 | * If yes, queue it to our IPI list and return 1 | |
3261 | * If no, return 0 | |
3262 | */ | |
3263 | static int rps_ipi_queued(struct softnet_data *sd) | |
3264 | { | |
3265 | #ifdef CONFIG_RPS | |
903ceff7 | 3266 | struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
e36fa2f7 ED |
3267 | |
3268 | if (sd != mysd) { | |
3269 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
3270 | mysd->rps_ipi_list = sd; | |
3271 | ||
3272 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3273 | return 1; | |
3274 | } | |
3275 | #endif /* CONFIG_RPS */ | |
3276 | return 0; | |
3277 | } | |
3278 | ||
99bbc707 WB |
3279 | #ifdef CONFIG_NET_FLOW_LIMIT |
3280 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
3281 | #endif | |
3282 | ||
3283 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
3284 | { | |
3285 | #ifdef CONFIG_NET_FLOW_LIMIT | |
3286 | struct sd_flow_limit *fl; | |
3287 | struct softnet_data *sd; | |
3288 | unsigned int old_flow, new_flow; | |
3289 | ||
3290 | if (qlen < (netdev_max_backlog >> 1)) | |
3291 | return false; | |
3292 | ||
903ceff7 | 3293 | sd = this_cpu_ptr(&softnet_data); |
99bbc707 WB |
3294 | |
3295 | rcu_read_lock(); | |
3296 | fl = rcu_dereference(sd->flow_limit); | |
3297 | if (fl) { | |
3958afa1 | 3298 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
3299 | old_flow = fl->history[fl->history_head]; |
3300 | fl->history[fl->history_head] = new_flow; | |
3301 | ||
3302 | fl->history_head++; | |
3303 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
3304 | ||
3305 | if (likely(fl->buckets[old_flow])) | |
3306 | fl->buckets[old_flow]--; | |
3307 | ||
3308 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
3309 | fl->count++; | |
3310 | rcu_read_unlock(); | |
3311 | return true; | |
3312 | } | |
3313 | } | |
3314 | rcu_read_unlock(); | |
3315 | #endif | |
3316 | return false; | |
3317 | } | |
3318 | ||
0a9627f2 TH |
3319 | /* |
3320 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
3321 | * queue (may be a remote CPU queue). | |
3322 | */ | |
fec5e652 TH |
3323 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
3324 | unsigned int *qtail) | |
0a9627f2 | 3325 | { |
e36fa2f7 | 3326 | struct softnet_data *sd; |
0a9627f2 | 3327 | unsigned long flags; |
99bbc707 | 3328 | unsigned int qlen; |
0a9627f2 | 3329 | |
e36fa2f7 | 3330 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
3331 | |
3332 | local_irq_save(flags); | |
0a9627f2 | 3333 | |
e36fa2f7 | 3334 | rps_lock(sd); |
99bbc707 WB |
3335 | qlen = skb_queue_len(&sd->input_pkt_queue); |
3336 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
e008f3f0 | 3337 | if (qlen) { |
0a9627f2 | 3338 | enqueue: |
e36fa2f7 | 3339 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 3340 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 3341 | rps_unlock(sd); |
152102c7 | 3342 | local_irq_restore(flags); |
0a9627f2 TH |
3343 | return NET_RX_SUCCESS; |
3344 | } | |
3345 | ||
ebda37c2 ED |
3346 | /* Schedule NAPI for backlog device |
3347 | * We can use non atomic operation since we own the queue lock | |
3348 | */ | |
3349 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 3350 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 3351 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
3352 | } |
3353 | goto enqueue; | |
3354 | } | |
3355 | ||
dee42870 | 3356 | sd->dropped++; |
e36fa2f7 | 3357 | rps_unlock(sd); |
0a9627f2 | 3358 | |
0a9627f2 TH |
3359 | local_irq_restore(flags); |
3360 | ||
caf586e5 | 3361 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
3362 | kfree_skb(skb); |
3363 | return NET_RX_DROP; | |
3364 | } | |
1da177e4 | 3365 | |
ae78dbfa | 3366 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 3367 | { |
b0e28f1e | 3368 | int ret; |
1da177e4 | 3369 | |
588f0330 | 3370 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 3371 | |
cf66ba58 | 3372 | trace_netif_rx(skb); |
df334545 | 3373 | #ifdef CONFIG_RPS |
c5905afb | 3374 | if (static_key_false(&rps_needed)) { |
fec5e652 | 3375 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
3376 | int cpu; |
3377 | ||
cece1945 | 3378 | preempt_disable(); |
b0e28f1e | 3379 | rcu_read_lock(); |
fec5e652 TH |
3380 | |
3381 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
3382 | if (cpu < 0) |
3383 | cpu = smp_processor_id(); | |
fec5e652 TH |
3384 | |
3385 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3386 | ||
b0e28f1e | 3387 | rcu_read_unlock(); |
cece1945 | 3388 | preempt_enable(); |
adc9300e ED |
3389 | } else |
3390 | #endif | |
fec5e652 TH |
3391 | { |
3392 | unsigned int qtail; | |
3393 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); | |
3394 | put_cpu(); | |
3395 | } | |
b0e28f1e | 3396 | return ret; |
1da177e4 | 3397 | } |
ae78dbfa BH |
3398 | |
3399 | /** | |
3400 | * netif_rx - post buffer to the network code | |
3401 | * @skb: buffer to post | |
3402 | * | |
3403 | * This function receives a packet from a device driver and queues it for | |
3404 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
3405 | * may be dropped during processing for congestion control or by the | |
3406 | * protocol layers. | |
3407 | * | |
3408 | * return values: | |
3409 | * NET_RX_SUCCESS (no congestion) | |
3410 | * NET_RX_DROP (packet was dropped) | |
3411 | * | |
3412 | */ | |
3413 | ||
3414 | int netif_rx(struct sk_buff *skb) | |
3415 | { | |
3416 | trace_netif_rx_entry(skb); | |
3417 | ||
3418 | return netif_rx_internal(skb); | |
3419 | } | |
d1b19dff | 3420 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
3421 | |
3422 | int netif_rx_ni(struct sk_buff *skb) | |
3423 | { | |
3424 | int err; | |
3425 | ||
ae78dbfa BH |
3426 | trace_netif_rx_ni_entry(skb); |
3427 | ||
1da177e4 | 3428 | preempt_disable(); |
ae78dbfa | 3429 | err = netif_rx_internal(skb); |
1da177e4 LT |
3430 | if (local_softirq_pending()) |
3431 | do_softirq(); | |
3432 | preempt_enable(); | |
3433 | ||
3434 | return err; | |
3435 | } | |
1da177e4 LT |
3436 | EXPORT_SYMBOL(netif_rx_ni); |
3437 | ||
1da177e4 LT |
3438 | static void net_tx_action(struct softirq_action *h) |
3439 | { | |
903ceff7 | 3440 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
1da177e4 LT |
3441 | |
3442 | if (sd->completion_queue) { | |
3443 | struct sk_buff *clist; | |
3444 | ||
3445 | local_irq_disable(); | |
3446 | clist = sd->completion_queue; | |
3447 | sd->completion_queue = NULL; | |
3448 | local_irq_enable(); | |
3449 | ||
3450 | while (clist) { | |
3451 | struct sk_buff *skb = clist; | |
3452 | clist = clist->next; | |
3453 | ||
547b792c | 3454 | WARN_ON(atomic_read(&skb->users)); |
e6247027 ED |
3455 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
3456 | trace_consume_skb(skb); | |
3457 | else | |
3458 | trace_kfree_skb(skb, net_tx_action); | |
1da177e4 LT |
3459 | __kfree_skb(skb); |
3460 | } | |
3461 | } | |
3462 | ||
3463 | if (sd->output_queue) { | |
37437bb2 | 3464 | struct Qdisc *head; |
1da177e4 LT |
3465 | |
3466 | local_irq_disable(); | |
3467 | head = sd->output_queue; | |
3468 | sd->output_queue = NULL; | |
a9cbd588 | 3469 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
3470 | local_irq_enable(); |
3471 | ||
3472 | while (head) { | |
37437bb2 DM |
3473 | struct Qdisc *q = head; |
3474 | spinlock_t *root_lock; | |
3475 | ||
1da177e4 LT |
3476 | head = head->next_sched; |
3477 | ||
5fb66229 | 3478 | root_lock = qdisc_lock(q); |
37437bb2 | 3479 | if (spin_trylock(root_lock)) { |
4e857c58 | 3480 | smp_mb__before_atomic(); |
def82a1d JP |
3481 | clear_bit(__QDISC_STATE_SCHED, |
3482 | &q->state); | |
37437bb2 DM |
3483 | qdisc_run(q); |
3484 | spin_unlock(root_lock); | |
1da177e4 | 3485 | } else { |
195648bb | 3486 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
e8a83e10 | 3487 | &q->state)) { |
195648bb | 3488 | __netif_reschedule(q); |
e8a83e10 | 3489 | } else { |
4e857c58 | 3490 | smp_mb__before_atomic(); |
e8a83e10 JP |
3491 | clear_bit(__QDISC_STATE_SCHED, |
3492 | &q->state); | |
3493 | } | |
1da177e4 LT |
3494 | } |
3495 | } | |
3496 | } | |
3497 | } | |
3498 | ||
ab95bfe0 JP |
3499 | #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \ |
3500 | (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)) | |
da678292 MM |
3501 | /* This hook is defined here for ATM LANE */ |
3502 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
3503 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 3504 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 3505 | #endif |
1da177e4 | 3506 | |
1da177e4 LT |
3507 | #ifdef CONFIG_NET_CLS_ACT |
3508 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
3509 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
3510 | * a compare and 2 stores extra right now if we dont have it on | |
3511 | * but have CONFIG_NET_CLS_ACT | |
25985edc LDM |
3512 | * NOTE: This doesn't stop any functionality; if you dont have |
3513 | * the ingress scheduler, you just can't add policies on ingress. | |
1da177e4 LT |
3514 | * |
3515 | */ | |
24824a09 | 3516 | static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq) |
1da177e4 | 3517 | { |
1da177e4 | 3518 | struct net_device *dev = skb->dev; |
f697c3e8 | 3519 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
555353cf DM |
3520 | int result = TC_ACT_OK; |
3521 | struct Qdisc *q; | |
4ec93edb | 3522 | |
de384830 | 3523 | if (unlikely(MAX_RED_LOOP < ttl++)) { |
e87cc472 JP |
3524 | net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n", |
3525 | skb->skb_iif, dev->ifindex); | |
f697c3e8 HX |
3526 | return TC_ACT_SHOT; |
3527 | } | |
1da177e4 | 3528 | |
f697c3e8 HX |
3529 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
3530 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); | |
1da177e4 | 3531 | |
46e5da40 | 3532 | q = rcu_dereference(rxq->qdisc); |
8d50b53d | 3533 | if (q != &noop_qdisc) { |
83874000 | 3534 | spin_lock(qdisc_lock(q)); |
a9312ae8 DM |
3535 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
3536 | result = qdisc_enqueue_root(skb, q); | |
83874000 DM |
3537 | spin_unlock(qdisc_lock(q)); |
3538 | } | |
f697c3e8 HX |
3539 | |
3540 | return result; | |
3541 | } | |
86e65da9 | 3542 | |
f697c3e8 HX |
3543 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
3544 | struct packet_type **pt_prev, | |
3545 | int *ret, struct net_device *orig_dev) | |
3546 | { | |
24824a09 ED |
3547 | struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue); |
3548 | ||
46e5da40 | 3549 | if (!rxq || rcu_access_pointer(rxq->qdisc) == &noop_qdisc) |
f697c3e8 | 3550 | goto out; |
1da177e4 | 3551 | |
f697c3e8 HX |
3552 | if (*pt_prev) { |
3553 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
3554 | *pt_prev = NULL; | |
1da177e4 LT |
3555 | } |
3556 | ||
24824a09 | 3557 | switch (ing_filter(skb, rxq)) { |
f697c3e8 HX |
3558 | case TC_ACT_SHOT: |
3559 | case TC_ACT_STOLEN: | |
3560 | kfree_skb(skb); | |
3561 | return NULL; | |
3562 | } | |
3563 | ||
3564 | out: | |
3565 | skb->tc_verd = 0; | |
3566 | return skb; | |
1da177e4 LT |
3567 | } |
3568 | #endif | |
3569 | ||
ab95bfe0 JP |
3570 | /** |
3571 | * netdev_rx_handler_register - register receive handler | |
3572 | * @dev: device to register a handler for | |
3573 | * @rx_handler: receive handler to register | |
93e2c32b | 3574 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 3575 | * |
e227867f | 3576 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
3577 | * called from __netif_receive_skb. A negative errno code is returned |
3578 | * on a failure. | |
3579 | * | |
3580 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
3581 | * |
3582 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
3583 | */ |
3584 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
3585 | rx_handler_func_t *rx_handler, |
3586 | void *rx_handler_data) | |
ab95bfe0 JP |
3587 | { |
3588 | ASSERT_RTNL(); | |
3589 | ||
3590 | if (dev->rx_handler) | |
3591 | return -EBUSY; | |
3592 | ||
00cfec37 | 3593 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 3594 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
3595 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
3596 | ||
3597 | return 0; | |
3598 | } | |
3599 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
3600 | ||
3601 | /** | |
3602 | * netdev_rx_handler_unregister - unregister receive handler | |
3603 | * @dev: device to unregister a handler from | |
3604 | * | |
166ec369 | 3605 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
3606 | * |
3607 | * The caller must hold the rtnl_mutex. | |
3608 | */ | |
3609 | void netdev_rx_handler_unregister(struct net_device *dev) | |
3610 | { | |
3611 | ||
3612 | ASSERT_RTNL(); | |
a9b3cd7f | 3613 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
3614 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
3615 | * section has a guarantee to see a non NULL rx_handler_data | |
3616 | * as well. | |
3617 | */ | |
3618 | synchronize_net(); | |
a9b3cd7f | 3619 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
3620 | } |
3621 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
3622 | ||
b4b9e355 MG |
3623 | /* |
3624 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
3625 | * the special handling of PFMEMALLOC skbs. | |
3626 | */ | |
3627 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
3628 | { | |
3629 | switch (skb->protocol) { | |
2b8837ae JP |
3630 | case htons(ETH_P_ARP): |
3631 | case htons(ETH_P_IP): | |
3632 | case htons(ETH_P_IPV6): | |
3633 | case htons(ETH_P_8021Q): | |
3634 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
3635 | return true; |
3636 | default: | |
3637 | return false; | |
3638 | } | |
3639 | } | |
3640 | ||
9754e293 | 3641 | static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc) |
1da177e4 LT |
3642 | { |
3643 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 3644 | rx_handler_func_t *rx_handler; |
f2ccd8fa | 3645 | struct net_device *orig_dev; |
8a4eb573 | 3646 | bool deliver_exact = false; |
1da177e4 | 3647 | int ret = NET_RX_DROP; |
252e3346 | 3648 | __be16 type; |
1da177e4 | 3649 | |
588f0330 | 3650 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 3651 | |
cf66ba58 | 3652 | trace_netif_receive_skb(skb); |
9b22ea56 | 3653 | |
cc9bd5ce | 3654 | orig_dev = skb->dev; |
8f903c70 | 3655 | |
c1d2bbe1 | 3656 | skb_reset_network_header(skb); |
fda55eca ED |
3657 | if (!skb_transport_header_was_set(skb)) |
3658 | skb_reset_transport_header(skb); | |
0b5c9db1 | 3659 | skb_reset_mac_len(skb); |
1da177e4 LT |
3660 | |
3661 | pt_prev = NULL; | |
3662 | ||
3663 | rcu_read_lock(); | |
3664 | ||
63d8ea7f | 3665 | another_round: |
b6858177 | 3666 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
3667 | |
3668 | __this_cpu_inc(softnet_data.processed); | |
3669 | ||
8ad227ff PM |
3670 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
3671 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
0d5501c1 | 3672 | skb = skb_vlan_untag(skb); |
bcc6d479 | 3673 | if (unlikely(!skb)) |
b4b9e355 | 3674 | goto unlock; |
bcc6d479 JP |
3675 | } |
3676 | ||
1da177e4 LT |
3677 | #ifdef CONFIG_NET_CLS_ACT |
3678 | if (skb->tc_verd & TC_NCLS) { | |
3679 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
3680 | goto ncls; | |
3681 | } | |
3682 | #endif | |
3683 | ||
9754e293 | 3684 | if (pfmemalloc) |
b4b9e355 MG |
3685 | goto skip_taps; |
3686 | ||
1da177e4 | 3687 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
7866a621 SN |
3688 | if (pt_prev) |
3689 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3690 | pt_prev = ptype; | |
3691 | } | |
3692 | ||
3693 | list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { | |
3694 | if (pt_prev) | |
3695 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3696 | pt_prev = ptype; | |
1da177e4 LT |
3697 | } |
3698 | ||
b4b9e355 | 3699 | skip_taps: |
1da177e4 | 3700 | #ifdef CONFIG_NET_CLS_ACT |
f697c3e8 HX |
3701 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
3702 | if (!skb) | |
b4b9e355 | 3703 | goto unlock; |
1da177e4 LT |
3704 | ncls: |
3705 | #endif | |
3706 | ||
9754e293 | 3707 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
3708 | goto drop; |
3709 | ||
df8a39de | 3710 | if (skb_vlan_tag_present(skb)) { |
2425717b JF |
3711 | if (pt_prev) { |
3712 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3713 | pt_prev = NULL; | |
3714 | } | |
48cc32d3 | 3715 | if (vlan_do_receive(&skb)) |
2425717b JF |
3716 | goto another_round; |
3717 | else if (unlikely(!skb)) | |
b4b9e355 | 3718 | goto unlock; |
2425717b JF |
3719 | } |
3720 | ||
48cc32d3 | 3721 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
3722 | if (rx_handler) { |
3723 | if (pt_prev) { | |
3724 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3725 | pt_prev = NULL; | |
3726 | } | |
8a4eb573 JP |
3727 | switch (rx_handler(&skb)) { |
3728 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 3729 | ret = NET_RX_SUCCESS; |
b4b9e355 | 3730 | goto unlock; |
8a4eb573 | 3731 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 3732 | goto another_round; |
8a4eb573 JP |
3733 | case RX_HANDLER_EXACT: |
3734 | deliver_exact = true; | |
3735 | case RX_HANDLER_PASS: | |
3736 | break; | |
3737 | default: | |
3738 | BUG(); | |
3739 | } | |
ab95bfe0 | 3740 | } |
1da177e4 | 3741 | |
df8a39de JP |
3742 | if (unlikely(skb_vlan_tag_present(skb))) { |
3743 | if (skb_vlan_tag_get_id(skb)) | |
d4b812de ED |
3744 | skb->pkt_type = PACKET_OTHERHOST; |
3745 | /* Note: we might in the future use prio bits | |
3746 | * and set skb->priority like in vlan_do_receive() | |
3747 | * For the time being, just ignore Priority Code Point | |
3748 | */ | |
3749 | skb->vlan_tci = 0; | |
3750 | } | |
48cc32d3 | 3751 | |
7866a621 SN |
3752 | type = skb->protocol; |
3753 | ||
63d8ea7f | 3754 | /* deliver only exact match when indicated */ |
7866a621 SN |
3755 | if (likely(!deliver_exact)) { |
3756 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
3757 | &ptype_base[ntohs(type) & | |
3758 | PTYPE_HASH_MASK]); | |
3759 | } | |
1f3c8804 | 3760 | |
7866a621 SN |
3761 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
3762 | &orig_dev->ptype_specific); | |
3763 | ||
3764 | if (unlikely(skb->dev != orig_dev)) { | |
3765 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
3766 | &skb->dev->ptype_specific); | |
1da177e4 LT |
3767 | } |
3768 | ||
3769 | if (pt_prev) { | |
1080e512 | 3770 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
0e698bf6 | 3771 | goto drop; |
1080e512 MT |
3772 | else |
3773 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1da177e4 | 3774 | } else { |
b4b9e355 | 3775 | drop: |
caf586e5 | 3776 | atomic_long_inc(&skb->dev->rx_dropped); |
1da177e4 LT |
3777 | kfree_skb(skb); |
3778 | /* Jamal, now you will not able to escape explaining | |
3779 | * me how you were going to use this. :-) | |
3780 | */ | |
3781 | ret = NET_RX_DROP; | |
3782 | } | |
3783 | ||
b4b9e355 | 3784 | unlock: |
1da177e4 | 3785 | rcu_read_unlock(); |
9754e293 DM |
3786 | return ret; |
3787 | } | |
3788 | ||
3789 | static int __netif_receive_skb(struct sk_buff *skb) | |
3790 | { | |
3791 | int ret; | |
3792 | ||
3793 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
3794 | unsigned long pflags = current->flags; | |
3795 | ||
3796 | /* | |
3797 | * PFMEMALLOC skbs are special, they should | |
3798 | * - be delivered to SOCK_MEMALLOC sockets only | |
3799 | * - stay away from userspace | |
3800 | * - have bounded memory usage | |
3801 | * | |
3802 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
3803 | * context down to all allocation sites. | |
3804 | */ | |
3805 | current->flags |= PF_MEMALLOC; | |
3806 | ret = __netif_receive_skb_core(skb, true); | |
3807 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
3808 | } else | |
3809 | ret = __netif_receive_skb_core(skb, false); | |
3810 | ||
1da177e4 LT |
3811 | return ret; |
3812 | } | |
0a9627f2 | 3813 | |
ae78dbfa | 3814 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 3815 | { |
588f0330 | 3816 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 3817 | |
c1f19b51 RC |
3818 | if (skb_defer_rx_timestamp(skb)) |
3819 | return NET_RX_SUCCESS; | |
3820 | ||
df334545 | 3821 | #ifdef CONFIG_RPS |
c5905afb | 3822 | if (static_key_false(&rps_needed)) { |
3b098e2d ED |
3823 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
3824 | int cpu, ret; | |
fec5e652 | 3825 | |
3b098e2d ED |
3826 | rcu_read_lock(); |
3827 | ||
3828 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
0a9627f2 | 3829 | |
3b098e2d ED |
3830 | if (cpu >= 0) { |
3831 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3832 | rcu_read_unlock(); | |
adc9300e | 3833 | return ret; |
3b098e2d | 3834 | } |
adc9300e | 3835 | rcu_read_unlock(); |
fec5e652 | 3836 | } |
1e94d72f | 3837 | #endif |
adc9300e | 3838 | return __netif_receive_skb(skb); |
0a9627f2 | 3839 | } |
ae78dbfa BH |
3840 | |
3841 | /** | |
3842 | * netif_receive_skb - process receive buffer from network | |
3843 | * @skb: buffer to process | |
3844 | * | |
3845 | * netif_receive_skb() is the main receive data processing function. | |
3846 | * It always succeeds. The buffer may be dropped during processing | |
3847 | * for congestion control or by the protocol layers. | |
3848 | * | |
3849 | * This function may only be called from softirq context and interrupts | |
3850 | * should be enabled. | |
3851 | * | |
3852 | * Return values (usually ignored): | |
3853 | * NET_RX_SUCCESS: no congestion | |
3854 | * NET_RX_DROP: packet was dropped | |
3855 | */ | |
7026b1dd | 3856 | int netif_receive_skb_sk(struct sock *sk, struct sk_buff *skb) |
ae78dbfa BH |
3857 | { |
3858 | trace_netif_receive_skb_entry(skb); | |
3859 | ||
3860 | return netif_receive_skb_internal(skb); | |
3861 | } | |
7026b1dd | 3862 | EXPORT_SYMBOL(netif_receive_skb_sk); |
1da177e4 | 3863 | |
88751275 ED |
3864 | /* Network device is going away, flush any packets still pending |
3865 | * Called with irqs disabled. | |
3866 | */ | |
152102c7 | 3867 | static void flush_backlog(void *arg) |
6e583ce5 | 3868 | { |
152102c7 | 3869 | struct net_device *dev = arg; |
903ceff7 | 3870 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
6e583ce5 SH |
3871 | struct sk_buff *skb, *tmp; |
3872 | ||
e36fa2f7 | 3873 | rps_lock(sd); |
6e7676c1 | 3874 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
6e583ce5 | 3875 | if (skb->dev == dev) { |
e36fa2f7 | 3876 | __skb_unlink(skb, &sd->input_pkt_queue); |
6e583ce5 | 3877 | kfree_skb(skb); |
76cc8b13 | 3878 | input_queue_head_incr(sd); |
6e583ce5 | 3879 | } |
6e7676c1 | 3880 | } |
e36fa2f7 | 3881 | rps_unlock(sd); |
6e7676c1 CG |
3882 | |
3883 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
3884 | if (skb->dev == dev) { | |
3885 | __skb_unlink(skb, &sd->process_queue); | |
3886 | kfree_skb(skb); | |
76cc8b13 | 3887 | input_queue_head_incr(sd); |
6e7676c1 CG |
3888 | } |
3889 | } | |
6e583ce5 SH |
3890 | } |
3891 | ||
d565b0a1 HX |
3892 | static int napi_gro_complete(struct sk_buff *skb) |
3893 | { | |
22061d80 | 3894 | struct packet_offload *ptype; |
d565b0a1 | 3895 | __be16 type = skb->protocol; |
22061d80 | 3896 | struct list_head *head = &offload_base; |
d565b0a1 HX |
3897 | int err = -ENOENT; |
3898 | ||
c3c7c254 ED |
3899 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
3900 | ||
fc59f9a3 HX |
3901 | if (NAPI_GRO_CB(skb)->count == 1) { |
3902 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 3903 | goto out; |
fc59f9a3 | 3904 | } |
d565b0a1 HX |
3905 | |
3906 | rcu_read_lock(); | |
3907 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 3908 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
3909 | continue; |
3910 | ||
299603e8 | 3911 | err = ptype->callbacks.gro_complete(skb, 0); |
d565b0a1 HX |
3912 | break; |
3913 | } | |
3914 | rcu_read_unlock(); | |
3915 | ||
3916 | if (err) { | |
3917 | WARN_ON(&ptype->list == head); | |
3918 | kfree_skb(skb); | |
3919 | return NET_RX_SUCCESS; | |
3920 | } | |
3921 | ||
3922 | out: | |
ae78dbfa | 3923 | return netif_receive_skb_internal(skb); |
d565b0a1 HX |
3924 | } |
3925 | ||
2e71a6f8 ED |
3926 | /* napi->gro_list contains packets ordered by age. |
3927 | * youngest packets at the head of it. | |
3928 | * Complete skbs in reverse order to reduce latencies. | |
3929 | */ | |
3930 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
d565b0a1 | 3931 | { |
2e71a6f8 | 3932 | struct sk_buff *skb, *prev = NULL; |
d565b0a1 | 3933 | |
2e71a6f8 ED |
3934 | /* scan list and build reverse chain */ |
3935 | for (skb = napi->gro_list; skb != NULL; skb = skb->next) { | |
3936 | skb->prev = prev; | |
3937 | prev = skb; | |
3938 | } | |
3939 | ||
3940 | for (skb = prev; skb; skb = prev) { | |
d565b0a1 | 3941 | skb->next = NULL; |
2e71a6f8 ED |
3942 | |
3943 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) | |
3944 | return; | |
3945 | ||
3946 | prev = skb->prev; | |
d565b0a1 | 3947 | napi_gro_complete(skb); |
2e71a6f8 | 3948 | napi->gro_count--; |
d565b0a1 HX |
3949 | } |
3950 | ||
3951 | napi->gro_list = NULL; | |
3952 | } | |
86cac58b | 3953 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 3954 | |
89c5fa33 ED |
3955 | static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb) |
3956 | { | |
3957 | struct sk_buff *p; | |
3958 | unsigned int maclen = skb->dev->hard_header_len; | |
0b4cec8c | 3959 | u32 hash = skb_get_hash_raw(skb); |
89c5fa33 ED |
3960 | |
3961 | for (p = napi->gro_list; p; p = p->next) { | |
3962 | unsigned long diffs; | |
3963 | ||
0b4cec8c TH |
3964 | NAPI_GRO_CB(p)->flush = 0; |
3965 | ||
3966 | if (hash != skb_get_hash_raw(p)) { | |
3967 | NAPI_GRO_CB(p)->same_flow = 0; | |
3968 | continue; | |
3969 | } | |
3970 | ||
89c5fa33 ED |
3971 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
3972 | diffs |= p->vlan_tci ^ skb->vlan_tci; | |
3973 | if (maclen == ETH_HLEN) | |
3974 | diffs |= compare_ether_header(skb_mac_header(p), | |
a50e233c | 3975 | skb_mac_header(skb)); |
89c5fa33 ED |
3976 | else if (!diffs) |
3977 | diffs = memcmp(skb_mac_header(p), | |
a50e233c | 3978 | skb_mac_header(skb), |
89c5fa33 ED |
3979 | maclen); |
3980 | NAPI_GRO_CB(p)->same_flow = !diffs; | |
89c5fa33 ED |
3981 | } |
3982 | } | |
3983 | ||
299603e8 JC |
3984 | static void skb_gro_reset_offset(struct sk_buff *skb) |
3985 | { | |
3986 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
3987 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
3988 | ||
3989 | NAPI_GRO_CB(skb)->data_offset = 0; | |
3990 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
3991 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
3992 | ||
3993 | if (skb_mac_header(skb) == skb_tail_pointer(skb) && | |
3994 | pinfo->nr_frags && | |
3995 | !PageHighMem(skb_frag_page(frag0))) { | |
3996 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); | |
3997 | NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0); | |
89c5fa33 ED |
3998 | } |
3999 | } | |
4000 | ||
a50e233c ED |
4001 | static void gro_pull_from_frag0(struct sk_buff *skb, int grow) |
4002 | { | |
4003 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
4004 | ||
4005 | BUG_ON(skb->end - skb->tail < grow); | |
4006 | ||
4007 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
4008 | ||
4009 | skb->data_len -= grow; | |
4010 | skb->tail += grow; | |
4011 | ||
4012 | pinfo->frags[0].page_offset += grow; | |
4013 | skb_frag_size_sub(&pinfo->frags[0], grow); | |
4014 | ||
4015 | if (unlikely(!skb_frag_size(&pinfo->frags[0]))) { | |
4016 | skb_frag_unref(skb, 0); | |
4017 | memmove(pinfo->frags, pinfo->frags + 1, | |
4018 | --pinfo->nr_frags * sizeof(pinfo->frags[0])); | |
4019 | } | |
4020 | } | |
4021 | ||
bb728820 | 4022 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 HX |
4023 | { |
4024 | struct sk_buff **pp = NULL; | |
22061d80 | 4025 | struct packet_offload *ptype; |
d565b0a1 | 4026 | __be16 type = skb->protocol; |
22061d80 | 4027 | struct list_head *head = &offload_base; |
0da2afd5 | 4028 | int same_flow; |
5b252f0c | 4029 | enum gro_result ret; |
a50e233c | 4030 | int grow; |
d565b0a1 | 4031 | |
9c62a68d | 4032 | if (!(skb->dev->features & NETIF_F_GRO)) |
d565b0a1 HX |
4033 | goto normal; |
4034 | ||
5a212329 | 4035 | if (skb_is_gso(skb) || skb_has_frag_list(skb) || skb->csum_bad) |
f17f5c91 HX |
4036 | goto normal; |
4037 | ||
89c5fa33 ED |
4038 | gro_list_prepare(napi, skb); |
4039 | ||
d565b0a1 HX |
4040 | rcu_read_lock(); |
4041 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 4042 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
4043 | continue; |
4044 | ||
86911732 | 4045 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 4046 | skb_reset_mac_len(skb); |
d565b0a1 HX |
4047 | NAPI_GRO_CB(skb)->same_flow = 0; |
4048 | NAPI_GRO_CB(skb)->flush = 0; | |
5d38a079 | 4049 | NAPI_GRO_CB(skb)->free = 0; |
b582ef09 | 4050 | NAPI_GRO_CB(skb)->udp_mark = 0; |
15e2396d | 4051 | NAPI_GRO_CB(skb)->gro_remcsum_start = 0; |
d565b0a1 | 4052 | |
662880f4 TH |
4053 | /* Setup for GRO checksum validation */ |
4054 | switch (skb->ip_summed) { | |
4055 | case CHECKSUM_COMPLETE: | |
4056 | NAPI_GRO_CB(skb)->csum = skb->csum; | |
4057 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
4058 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
4059 | break; | |
4060 | case CHECKSUM_UNNECESSARY: | |
4061 | NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1; | |
4062 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
4063 | break; | |
4064 | default: | |
4065 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
4066 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
4067 | } | |
d565b0a1 | 4068 | |
f191a1d1 | 4069 | pp = ptype->callbacks.gro_receive(&napi->gro_list, skb); |
d565b0a1 HX |
4070 | break; |
4071 | } | |
4072 | rcu_read_unlock(); | |
4073 | ||
4074 | if (&ptype->list == head) | |
4075 | goto normal; | |
4076 | ||
0da2afd5 | 4077 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 4078 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 4079 | |
d565b0a1 HX |
4080 | if (pp) { |
4081 | struct sk_buff *nskb = *pp; | |
4082 | ||
4083 | *pp = nskb->next; | |
4084 | nskb->next = NULL; | |
4085 | napi_gro_complete(nskb); | |
4ae5544f | 4086 | napi->gro_count--; |
d565b0a1 HX |
4087 | } |
4088 | ||
0da2afd5 | 4089 | if (same_flow) |
d565b0a1 HX |
4090 | goto ok; |
4091 | ||
600adc18 | 4092 | if (NAPI_GRO_CB(skb)->flush) |
d565b0a1 | 4093 | goto normal; |
d565b0a1 | 4094 | |
600adc18 ED |
4095 | if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) { |
4096 | struct sk_buff *nskb = napi->gro_list; | |
4097 | ||
4098 | /* locate the end of the list to select the 'oldest' flow */ | |
4099 | while (nskb->next) { | |
4100 | pp = &nskb->next; | |
4101 | nskb = *pp; | |
4102 | } | |
4103 | *pp = NULL; | |
4104 | nskb->next = NULL; | |
4105 | napi_gro_complete(nskb); | |
4106 | } else { | |
4107 | napi->gro_count++; | |
4108 | } | |
d565b0a1 | 4109 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 4110 | NAPI_GRO_CB(skb)->age = jiffies; |
29e98242 | 4111 | NAPI_GRO_CB(skb)->last = skb; |
86911732 | 4112 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
d565b0a1 HX |
4113 | skb->next = napi->gro_list; |
4114 | napi->gro_list = skb; | |
5d0d9be8 | 4115 | ret = GRO_HELD; |
d565b0a1 | 4116 | |
ad0f9904 | 4117 | pull: |
a50e233c ED |
4118 | grow = skb_gro_offset(skb) - skb_headlen(skb); |
4119 | if (grow > 0) | |
4120 | gro_pull_from_frag0(skb, grow); | |
d565b0a1 | 4121 | ok: |
5d0d9be8 | 4122 | return ret; |
d565b0a1 HX |
4123 | |
4124 | normal: | |
ad0f9904 HX |
4125 | ret = GRO_NORMAL; |
4126 | goto pull; | |
5d38a079 | 4127 | } |
96e93eab | 4128 | |
bf5a755f JC |
4129 | struct packet_offload *gro_find_receive_by_type(__be16 type) |
4130 | { | |
4131 | struct list_head *offload_head = &offload_base; | |
4132 | struct packet_offload *ptype; | |
4133 | ||
4134 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
4135 | if (ptype->type != type || !ptype->callbacks.gro_receive) | |
4136 | continue; | |
4137 | return ptype; | |
4138 | } | |
4139 | return NULL; | |
4140 | } | |
e27a2f83 | 4141 | EXPORT_SYMBOL(gro_find_receive_by_type); |
bf5a755f JC |
4142 | |
4143 | struct packet_offload *gro_find_complete_by_type(__be16 type) | |
4144 | { | |
4145 | struct list_head *offload_head = &offload_base; | |
4146 | struct packet_offload *ptype; | |
4147 | ||
4148 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
4149 | if (ptype->type != type || !ptype->callbacks.gro_complete) | |
4150 | continue; | |
4151 | return ptype; | |
4152 | } | |
4153 | return NULL; | |
4154 | } | |
e27a2f83 | 4155 | EXPORT_SYMBOL(gro_find_complete_by_type); |
5d38a079 | 4156 | |
bb728820 | 4157 | static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
5d38a079 | 4158 | { |
5d0d9be8 HX |
4159 | switch (ret) { |
4160 | case GRO_NORMAL: | |
ae78dbfa | 4161 | if (netif_receive_skb_internal(skb)) |
c7c4b3b6 BH |
4162 | ret = GRO_DROP; |
4163 | break; | |
5d38a079 | 4164 | |
5d0d9be8 | 4165 | case GRO_DROP: |
5d38a079 HX |
4166 | kfree_skb(skb); |
4167 | break; | |
5b252f0c | 4168 | |
daa86548 | 4169 | case GRO_MERGED_FREE: |
d7e8883c ED |
4170 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
4171 | kmem_cache_free(skbuff_head_cache, skb); | |
4172 | else | |
4173 | __kfree_skb(skb); | |
daa86548 ED |
4174 | break; |
4175 | ||
5b252f0c BH |
4176 | case GRO_HELD: |
4177 | case GRO_MERGED: | |
4178 | break; | |
5d38a079 HX |
4179 | } |
4180 | ||
c7c4b3b6 | 4181 | return ret; |
5d0d9be8 | 4182 | } |
5d0d9be8 | 4183 | |
c7c4b3b6 | 4184 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 4185 | { |
ae78dbfa | 4186 | trace_napi_gro_receive_entry(skb); |
86911732 | 4187 | |
a50e233c ED |
4188 | skb_gro_reset_offset(skb); |
4189 | ||
89c5fa33 | 4190 | return napi_skb_finish(dev_gro_receive(napi, skb), skb); |
d565b0a1 HX |
4191 | } |
4192 | EXPORT_SYMBOL(napi_gro_receive); | |
4193 | ||
d0c2b0d2 | 4194 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 4195 | { |
93a35f59 ED |
4196 | if (unlikely(skb->pfmemalloc)) { |
4197 | consume_skb(skb); | |
4198 | return; | |
4199 | } | |
96e93eab | 4200 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
4201 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
4202 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
3701e513 | 4203 | skb->vlan_tci = 0; |
66c46d74 | 4204 | skb->dev = napi->dev; |
6d152e23 | 4205 | skb->skb_iif = 0; |
c3caf119 JC |
4206 | skb->encapsulation = 0; |
4207 | skb_shinfo(skb)->gso_type = 0; | |
e33d0ba8 | 4208 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
96e93eab HX |
4209 | |
4210 | napi->skb = skb; | |
4211 | } | |
96e93eab | 4212 | |
76620aaf | 4213 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 4214 | { |
5d38a079 | 4215 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
4216 | |
4217 | if (!skb) { | |
fd11a83d | 4218 | skb = napi_alloc_skb(napi, GRO_MAX_HEAD); |
84b9cd63 | 4219 | napi->skb = skb; |
80595d59 | 4220 | } |
96e93eab HX |
4221 | return skb; |
4222 | } | |
76620aaf | 4223 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 4224 | |
a50e233c ED |
4225 | static gro_result_t napi_frags_finish(struct napi_struct *napi, |
4226 | struct sk_buff *skb, | |
4227 | gro_result_t ret) | |
96e93eab | 4228 | { |
5d0d9be8 HX |
4229 | switch (ret) { |
4230 | case GRO_NORMAL: | |
a50e233c ED |
4231 | case GRO_HELD: |
4232 | __skb_push(skb, ETH_HLEN); | |
4233 | skb->protocol = eth_type_trans(skb, skb->dev); | |
4234 | if (ret == GRO_NORMAL && netif_receive_skb_internal(skb)) | |
c7c4b3b6 | 4235 | ret = GRO_DROP; |
86911732 | 4236 | break; |
5d38a079 | 4237 | |
5d0d9be8 | 4238 | case GRO_DROP: |
5d0d9be8 HX |
4239 | case GRO_MERGED_FREE: |
4240 | napi_reuse_skb(napi, skb); | |
4241 | break; | |
5b252f0c BH |
4242 | |
4243 | case GRO_MERGED: | |
4244 | break; | |
5d0d9be8 | 4245 | } |
5d38a079 | 4246 | |
c7c4b3b6 | 4247 | return ret; |
5d38a079 | 4248 | } |
5d0d9be8 | 4249 | |
a50e233c ED |
4250 | /* Upper GRO stack assumes network header starts at gro_offset=0 |
4251 | * Drivers could call both napi_gro_frags() and napi_gro_receive() | |
4252 | * We copy ethernet header into skb->data to have a common layout. | |
4253 | */ | |
4adb9c4a | 4254 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
4255 | { |
4256 | struct sk_buff *skb = napi->skb; | |
a50e233c ED |
4257 | const struct ethhdr *eth; |
4258 | unsigned int hlen = sizeof(*eth); | |
76620aaf HX |
4259 | |
4260 | napi->skb = NULL; | |
4261 | ||
a50e233c ED |
4262 | skb_reset_mac_header(skb); |
4263 | skb_gro_reset_offset(skb); | |
4264 | ||
4265 | eth = skb_gro_header_fast(skb, 0); | |
4266 | if (unlikely(skb_gro_header_hard(skb, hlen))) { | |
4267 | eth = skb_gro_header_slow(skb, hlen, 0); | |
4268 | if (unlikely(!eth)) { | |
4269 | napi_reuse_skb(napi, skb); | |
4270 | return NULL; | |
4271 | } | |
4272 | } else { | |
4273 | gro_pull_from_frag0(skb, hlen); | |
4274 | NAPI_GRO_CB(skb)->frag0 += hlen; | |
4275 | NAPI_GRO_CB(skb)->frag0_len -= hlen; | |
76620aaf | 4276 | } |
a50e233c ED |
4277 | __skb_pull(skb, hlen); |
4278 | ||
4279 | /* | |
4280 | * This works because the only protocols we care about don't require | |
4281 | * special handling. | |
4282 | * We'll fix it up properly in napi_frags_finish() | |
4283 | */ | |
4284 | skb->protocol = eth->h_proto; | |
76620aaf | 4285 | |
76620aaf HX |
4286 | return skb; |
4287 | } | |
76620aaf | 4288 | |
c7c4b3b6 | 4289 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 4290 | { |
76620aaf | 4291 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
4292 | |
4293 | if (!skb) | |
c7c4b3b6 | 4294 | return GRO_DROP; |
5d0d9be8 | 4295 | |
ae78dbfa BH |
4296 | trace_napi_gro_frags_entry(skb); |
4297 | ||
89c5fa33 | 4298 | return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
5d0d9be8 | 4299 | } |
5d38a079 HX |
4300 | EXPORT_SYMBOL(napi_gro_frags); |
4301 | ||
573e8fca TH |
4302 | /* Compute the checksum from gro_offset and return the folded value |
4303 | * after adding in any pseudo checksum. | |
4304 | */ | |
4305 | __sum16 __skb_gro_checksum_complete(struct sk_buff *skb) | |
4306 | { | |
4307 | __wsum wsum; | |
4308 | __sum16 sum; | |
4309 | ||
4310 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0); | |
4311 | ||
4312 | /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */ | |
4313 | sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum)); | |
4314 | if (likely(!sum)) { | |
4315 | if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && | |
4316 | !skb->csum_complete_sw) | |
4317 | netdev_rx_csum_fault(skb->dev); | |
4318 | } | |
4319 | ||
4320 | NAPI_GRO_CB(skb)->csum = wsum; | |
4321 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
4322 | ||
4323 | return sum; | |
4324 | } | |
4325 | EXPORT_SYMBOL(__skb_gro_checksum_complete); | |
4326 | ||
e326bed2 | 4327 | /* |
855abcf0 | 4328 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
4329 | * Note: called with local irq disabled, but exits with local irq enabled. |
4330 | */ | |
4331 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
4332 | { | |
4333 | #ifdef CONFIG_RPS | |
4334 | struct softnet_data *remsd = sd->rps_ipi_list; | |
4335 | ||
4336 | if (remsd) { | |
4337 | sd->rps_ipi_list = NULL; | |
4338 | ||
4339 | local_irq_enable(); | |
4340 | ||
4341 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
4342 | while (remsd) { | |
4343 | struct softnet_data *next = remsd->rps_ipi_next; | |
4344 | ||
4345 | if (cpu_online(remsd->cpu)) | |
c46fff2a | 4346 | smp_call_function_single_async(remsd->cpu, |
fce8ad15 | 4347 | &remsd->csd); |
e326bed2 ED |
4348 | remsd = next; |
4349 | } | |
4350 | } else | |
4351 | #endif | |
4352 | local_irq_enable(); | |
4353 | } | |
4354 | ||
d75b1ade ED |
4355 | static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
4356 | { | |
4357 | #ifdef CONFIG_RPS | |
4358 | return sd->rps_ipi_list != NULL; | |
4359 | #else | |
4360 | return false; | |
4361 | #endif | |
4362 | } | |
4363 | ||
bea3348e | 4364 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 LT |
4365 | { |
4366 | int work = 0; | |
eecfd7c4 | 4367 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
1da177e4 | 4368 | |
e326bed2 ED |
4369 | /* Check if we have pending ipi, its better to send them now, |
4370 | * not waiting net_rx_action() end. | |
4371 | */ | |
d75b1ade | 4372 | if (sd_has_rps_ipi_waiting(sd)) { |
e326bed2 ED |
4373 | local_irq_disable(); |
4374 | net_rps_action_and_irq_enable(sd); | |
4375 | } | |
d75b1ade | 4376 | |
bea3348e | 4377 | napi->weight = weight_p; |
6e7676c1 | 4378 | local_irq_disable(); |
11ef7a89 | 4379 | while (1) { |
1da177e4 | 4380 | struct sk_buff *skb; |
6e7676c1 CG |
4381 | |
4382 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
4383 | local_irq_enable(); | |
4384 | __netif_receive_skb(skb); | |
6e7676c1 | 4385 | local_irq_disable(); |
76cc8b13 TH |
4386 | input_queue_head_incr(sd); |
4387 | if (++work >= quota) { | |
4388 | local_irq_enable(); | |
4389 | return work; | |
4390 | } | |
6e7676c1 | 4391 | } |
1da177e4 | 4392 | |
e36fa2f7 | 4393 | rps_lock(sd); |
11ef7a89 | 4394 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
4395 | /* |
4396 | * Inline a custom version of __napi_complete(). | |
4397 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
4398 | * and NAPI_STATE_SCHED is the only possible flag set |
4399 | * on backlog. | |
4400 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
4401 | * and we dont need an smp_mb() memory barrier. |
4402 | */ | |
eecfd7c4 | 4403 | napi->state = 0; |
11ef7a89 | 4404 | rps_unlock(sd); |
eecfd7c4 | 4405 | |
11ef7a89 | 4406 | break; |
bea3348e | 4407 | } |
11ef7a89 TH |
4408 | |
4409 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
4410 | &sd->process_queue); | |
e36fa2f7 | 4411 | rps_unlock(sd); |
6e7676c1 CG |
4412 | } |
4413 | local_irq_enable(); | |
1da177e4 | 4414 | |
bea3348e SH |
4415 | return work; |
4416 | } | |
1da177e4 | 4417 | |
bea3348e SH |
4418 | /** |
4419 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 4420 | * @n: entry to schedule |
bea3348e | 4421 | * |
bc9ad166 ED |
4422 | * The entry's receive function will be scheduled to run. |
4423 | * Consider using __napi_schedule_irqoff() if hard irqs are masked. | |
bea3348e | 4424 | */ |
b5606c2d | 4425 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
4426 | { |
4427 | unsigned long flags; | |
1da177e4 | 4428 | |
bea3348e | 4429 | local_irq_save(flags); |
903ceff7 | 4430 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); |
bea3348e | 4431 | local_irq_restore(flags); |
1da177e4 | 4432 | } |
bea3348e SH |
4433 | EXPORT_SYMBOL(__napi_schedule); |
4434 | ||
bc9ad166 ED |
4435 | /** |
4436 | * __napi_schedule_irqoff - schedule for receive | |
4437 | * @n: entry to schedule | |
4438 | * | |
4439 | * Variant of __napi_schedule() assuming hard irqs are masked | |
4440 | */ | |
4441 | void __napi_schedule_irqoff(struct napi_struct *n) | |
4442 | { | |
4443 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); | |
4444 | } | |
4445 | EXPORT_SYMBOL(__napi_schedule_irqoff); | |
4446 | ||
d565b0a1 HX |
4447 | void __napi_complete(struct napi_struct *n) |
4448 | { | |
4449 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); | |
d565b0a1 | 4450 | |
d75b1ade | 4451 | list_del_init(&n->poll_list); |
4e857c58 | 4452 | smp_mb__before_atomic(); |
d565b0a1 HX |
4453 | clear_bit(NAPI_STATE_SCHED, &n->state); |
4454 | } | |
4455 | EXPORT_SYMBOL(__napi_complete); | |
4456 | ||
3b47d303 | 4457 | void napi_complete_done(struct napi_struct *n, int work_done) |
d565b0a1 HX |
4458 | { |
4459 | unsigned long flags; | |
4460 | ||
4461 | /* | |
4462 | * don't let napi dequeue from the cpu poll list | |
4463 | * just in case its running on a different cpu | |
4464 | */ | |
4465 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) | |
4466 | return; | |
4467 | ||
3b47d303 ED |
4468 | if (n->gro_list) { |
4469 | unsigned long timeout = 0; | |
d75b1ade | 4470 | |
3b47d303 ED |
4471 | if (work_done) |
4472 | timeout = n->dev->gro_flush_timeout; | |
4473 | ||
4474 | if (timeout) | |
4475 | hrtimer_start(&n->timer, ns_to_ktime(timeout), | |
4476 | HRTIMER_MODE_REL_PINNED); | |
4477 | else | |
4478 | napi_gro_flush(n, false); | |
4479 | } | |
d75b1ade ED |
4480 | if (likely(list_empty(&n->poll_list))) { |
4481 | WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED, &n->state)); | |
4482 | } else { | |
4483 | /* If n->poll_list is not empty, we need to mask irqs */ | |
4484 | local_irq_save(flags); | |
4485 | __napi_complete(n); | |
4486 | local_irq_restore(flags); | |
4487 | } | |
d565b0a1 | 4488 | } |
3b47d303 | 4489 | EXPORT_SYMBOL(napi_complete_done); |
d565b0a1 | 4490 | |
af12fa6e ET |
4491 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
4492 | struct napi_struct *napi_by_id(unsigned int napi_id) | |
4493 | { | |
4494 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
4495 | struct napi_struct *napi; | |
4496 | ||
4497 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
4498 | if (napi->napi_id == napi_id) | |
4499 | return napi; | |
4500 | ||
4501 | return NULL; | |
4502 | } | |
4503 | EXPORT_SYMBOL_GPL(napi_by_id); | |
4504 | ||
4505 | void napi_hash_add(struct napi_struct *napi) | |
4506 | { | |
4507 | if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) { | |
4508 | ||
4509 | spin_lock(&napi_hash_lock); | |
4510 | ||
4511 | /* 0 is not a valid id, we also skip an id that is taken | |
4512 | * we expect both events to be extremely rare | |
4513 | */ | |
4514 | napi->napi_id = 0; | |
4515 | while (!napi->napi_id) { | |
4516 | napi->napi_id = ++napi_gen_id; | |
4517 | if (napi_by_id(napi->napi_id)) | |
4518 | napi->napi_id = 0; | |
4519 | } | |
4520 | ||
4521 | hlist_add_head_rcu(&napi->napi_hash_node, | |
4522 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
4523 | ||
4524 | spin_unlock(&napi_hash_lock); | |
4525 | } | |
4526 | } | |
4527 | EXPORT_SYMBOL_GPL(napi_hash_add); | |
4528 | ||
4529 | /* Warning : caller is responsible to make sure rcu grace period | |
4530 | * is respected before freeing memory containing @napi | |
4531 | */ | |
4532 | void napi_hash_del(struct napi_struct *napi) | |
4533 | { | |
4534 | spin_lock(&napi_hash_lock); | |
4535 | ||
4536 | if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) | |
4537 | hlist_del_rcu(&napi->napi_hash_node); | |
4538 | ||
4539 | spin_unlock(&napi_hash_lock); | |
4540 | } | |
4541 | EXPORT_SYMBOL_GPL(napi_hash_del); | |
4542 | ||
3b47d303 ED |
4543 | static enum hrtimer_restart napi_watchdog(struct hrtimer *timer) |
4544 | { | |
4545 | struct napi_struct *napi; | |
4546 | ||
4547 | napi = container_of(timer, struct napi_struct, timer); | |
4548 | if (napi->gro_list) | |
4549 | napi_schedule(napi); | |
4550 | ||
4551 | return HRTIMER_NORESTART; | |
4552 | } | |
4553 | ||
d565b0a1 HX |
4554 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
4555 | int (*poll)(struct napi_struct *, int), int weight) | |
4556 | { | |
4557 | INIT_LIST_HEAD(&napi->poll_list); | |
3b47d303 ED |
4558 | hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); |
4559 | napi->timer.function = napi_watchdog; | |
4ae5544f | 4560 | napi->gro_count = 0; |
d565b0a1 | 4561 | napi->gro_list = NULL; |
5d38a079 | 4562 | napi->skb = NULL; |
d565b0a1 | 4563 | napi->poll = poll; |
82dc3c63 ED |
4564 | if (weight > NAPI_POLL_WEIGHT) |
4565 | pr_err_once("netif_napi_add() called with weight %d on device %s\n", | |
4566 | weight, dev->name); | |
d565b0a1 HX |
4567 | napi->weight = weight; |
4568 | list_add(&napi->dev_list, &dev->napi_list); | |
d565b0a1 | 4569 | napi->dev = dev; |
5d38a079 | 4570 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
4571 | spin_lock_init(&napi->poll_lock); |
4572 | napi->poll_owner = -1; | |
4573 | #endif | |
4574 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
4575 | } | |
4576 | EXPORT_SYMBOL(netif_napi_add); | |
4577 | ||
3b47d303 ED |
4578 | void napi_disable(struct napi_struct *n) |
4579 | { | |
4580 | might_sleep(); | |
4581 | set_bit(NAPI_STATE_DISABLE, &n->state); | |
4582 | ||
4583 | while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) | |
4584 | msleep(1); | |
4585 | ||
4586 | hrtimer_cancel(&n->timer); | |
4587 | ||
4588 | clear_bit(NAPI_STATE_DISABLE, &n->state); | |
4589 | } | |
4590 | EXPORT_SYMBOL(napi_disable); | |
4591 | ||
d565b0a1 HX |
4592 | void netif_napi_del(struct napi_struct *napi) |
4593 | { | |
d7b06636 | 4594 | list_del_init(&napi->dev_list); |
76620aaf | 4595 | napi_free_frags(napi); |
d565b0a1 | 4596 | |
289dccbe | 4597 | kfree_skb_list(napi->gro_list); |
d565b0a1 | 4598 | napi->gro_list = NULL; |
4ae5544f | 4599 | napi->gro_count = 0; |
d565b0a1 HX |
4600 | } |
4601 | EXPORT_SYMBOL(netif_napi_del); | |
4602 | ||
726ce70e HX |
4603 | static int napi_poll(struct napi_struct *n, struct list_head *repoll) |
4604 | { | |
4605 | void *have; | |
4606 | int work, weight; | |
4607 | ||
4608 | list_del_init(&n->poll_list); | |
4609 | ||
4610 | have = netpoll_poll_lock(n); | |
4611 | ||
4612 | weight = n->weight; | |
4613 | ||
4614 | /* This NAPI_STATE_SCHED test is for avoiding a race | |
4615 | * with netpoll's poll_napi(). Only the entity which | |
4616 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
4617 | * actually make the ->poll() call. Therefore we avoid | |
4618 | * accidentally calling ->poll() when NAPI is not scheduled. | |
4619 | */ | |
4620 | work = 0; | |
4621 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { | |
4622 | work = n->poll(n, weight); | |
4623 | trace_napi_poll(n); | |
4624 | } | |
4625 | ||
4626 | WARN_ON_ONCE(work > weight); | |
4627 | ||
4628 | if (likely(work < weight)) | |
4629 | goto out_unlock; | |
4630 | ||
4631 | /* Drivers must not modify the NAPI state if they | |
4632 | * consume the entire weight. In such cases this code | |
4633 | * still "owns" the NAPI instance and therefore can | |
4634 | * move the instance around on the list at-will. | |
4635 | */ | |
4636 | if (unlikely(napi_disable_pending(n))) { | |
4637 | napi_complete(n); | |
4638 | goto out_unlock; | |
4639 | } | |
4640 | ||
4641 | if (n->gro_list) { | |
4642 | /* flush too old packets | |
4643 | * If HZ < 1000, flush all packets. | |
4644 | */ | |
4645 | napi_gro_flush(n, HZ >= 1000); | |
4646 | } | |
4647 | ||
001ce546 HX |
4648 | /* Some drivers may have called napi_schedule |
4649 | * prior to exhausting their budget. | |
4650 | */ | |
4651 | if (unlikely(!list_empty(&n->poll_list))) { | |
4652 | pr_warn_once("%s: Budget exhausted after napi rescheduled\n", | |
4653 | n->dev ? n->dev->name : "backlog"); | |
4654 | goto out_unlock; | |
4655 | } | |
4656 | ||
726ce70e HX |
4657 | list_add_tail(&n->poll_list, repoll); |
4658 | ||
4659 | out_unlock: | |
4660 | netpoll_poll_unlock(have); | |
4661 | ||
4662 | return work; | |
4663 | } | |
4664 | ||
1da177e4 LT |
4665 | static void net_rx_action(struct softirq_action *h) |
4666 | { | |
903ceff7 | 4667 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
24f8b238 | 4668 | unsigned long time_limit = jiffies + 2; |
51b0bded | 4669 | int budget = netdev_budget; |
d75b1ade ED |
4670 | LIST_HEAD(list); |
4671 | LIST_HEAD(repoll); | |
53fb95d3 | 4672 | |
1da177e4 | 4673 | local_irq_disable(); |
d75b1ade ED |
4674 | list_splice_init(&sd->poll_list, &list); |
4675 | local_irq_enable(); | |
1da177e4 | 4676 | |
ceb8d5bf | 4677 | for (;;) { |
bea3348e | 4678 | struct napi_struct *n; |
1da177e4 | 4679 | |
ceb8d5bf HX |
4680 | if (list_empty(&list)) { |
4681 | if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll)) | |
4682 | return; | |
4683 | break; | |
4684 | } | |
4685 | ||
6bd373eb HX |
4686 | n = list_first_entry(&list, struct napi_struct, poll_list); |
4687 | budget -= napi_poll(n, &repoll); | |
4688 | ||
d75b1ade | 4689 | /* If softirq window is exhausted then punt. |
24f8b238 SH |
4690 | * Allow this to run for 2 jiffies since which will allow |
4691 | * an average latency of 1.5/HZ. | |
bea3348e | 4692 | */ |
ceb8d5bf HX |
4693 | if (unlikely(budget <= 0 || |
4694 | time_after_eq(jiffies, time_limit))) { | |
4695 | sd->time_squeeze++; | |
4696 | break; | |
4697 | } | |
1da177e4 | 4698 | } |
d75b1ade | 4699 | |
d75b1ade ED |
4700 | local_irq_disable(); |
4701 | ||
4702 | list_splice_tail_init(&sd->poll_list, &list); | |
4703 | list_splice_tail(&repoll, &list); | |
4704 | list_splice(&list, &sd->poll_list); | |
4705 | if (!list_empty(&sd->poll_list)) | |
4706 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
4707 | ||
e326bed2 | 4708 | net_rps_action_and_irq_enable(sd); |
1da177e4 LT |
4709 | } |
4710 | ||
aa9d8560 | 4711 | struct netdev_adjacent { |
9ff162a8 | 4712 | struct net_device *dev; |
5d261913 VF |
4713 | |
4714 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 4715 | bool master; |
5d261913 | 4716 | |
5d261913 VF |
4717 | /* counter for the number of times this device was added to us */ |
4718 | u16 ref_nr; | |
4719 | ||
402dae96 VF |
4720 | /* private field for the users */ |
4721 | void *private; | |
4722 | ||
9ff162a8 JP |
4723 | struct list_head list; |
4724 | struct rcu_head rcu; | |
9ff162a8 JP |
4725 | }; |
4726 | ||
5d261913 VF |
4727 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev, |
4728 | struct net_device *adj_dev, | |
2f268f12 | 4729 | struct list_head *adj_list) |
9ff162a8 | 4730 | { |
5d261913 | 4731 | struct netdev_adjacent *adj; |
5d261913 | 4732 | |
2f268f12 | 4733 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
4734 | if (adj->dev == adj_dev) |
4735 | return adj; | |
9ff162a8 JP |
4736 | } |
4737 | return NULL; | |
4738 | } | |
4739 | ||
4740 | /** | |
4741 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
4742 | * @dev: device | |
4743 | * @upper_dev: upper device to check | |
4744 | * | |
4745 | * Find out if a device is linked to specified upper device and return true | |
4746 | * in case it is. Note that this checks only immediate upper device, | |
4747 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
4748 | */ | |
4749 | bool netdev_has_upper_dev(struct net_device *dev, | |
4750 | struct net_device *upper_dev) | |
4751 | { | |
4752 | ASSERT_RTNL(); | |
4753 | ||
2f268f12 | 4754 | return __netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper); |
9ff162a8 JP |
4755 | } |
4756 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
4757 | ||
4758 | /** | |
4759 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
4760 | * @dev: device | |
4761 | * | |
4762 | * Find out if a device is linked to an upper device and return true in case | |
4763 | * it is. The caller must hold the RTNL lock. | |
4764 | */ | |
1d143d9f | 4765 | static bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
4766 | { |
4767 | ASSERT_RTNL(); | |
4768 | ||
2f268f12 | 4769 | return !list_empty(&dev->all_adj_list.upper); |
9ff162a8 | 4770 | } |
9ff162a8 JP |
4771 | |
4772 | /** | |
4773 | * netdev_master_upper_dev_get - Get master upper device | |
4774 | * @dev: device | |
4775 | * | |
4776 | * Find a master upper device and return pointer to it or NULL in case | |
4777 | * it's not there. The caller must hold the RTNL lock. | |
4778 | */ | |
4779 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
4780 | { | |
aa9d8560 | 4781 | struct netdev_adjacent *upper; |
9ff162a8 JP |
4782 | |
4783 | ASSERT_RTNL(); | |
4784 | ||
2f268f12 | 4785 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
4786 | return NULL; |
4787 | ||
2f268f12 | 4788 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 4789 | struct netdev_adjacent, list); |
9ff162a8 JP |
4790 | if (likely(upper->master)) |
4791 | return upper->dev; | |
4792 | return NULL; | |
4793 | } | |
4794 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
4795 | ||
b6ccba4c VF |
4796 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
4797 | { | |
4798 | struct netdev_adjacent *adj; | |
4799 | ||
4800 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
4801 | ||
4802 | return adj->private; | |
4803 | } | |
4804 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
4805 | ||
44a40855 VY |
4806 | /** |
4807 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
4808 | * @dev: device | |
4809 | * @iter: list_head ** of the current position | |
4810 | * | |
4811 | * Gets the next device from the dev's upper list, starting from iter | |
4812 | * position. The caller must hold RCU read lock. | |
4813 | */ | |
4814 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
4815 | struct list_head **iter) | |
4816 | { | |
4817 | struct netdev_adjacent *upper; | |
4818 | ||
4819 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
4820 | ||
4821 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4822 | ||
4823 | if (&upper->list == &dev->adj_list.upper) | |
4824 | return NULL; | |
4825 | ||
4826 | *iter = &upper->list; | |
4827 | ||
4828 | return upper->dev; | |
4829 | } | |
4830 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
4831 | ||
31088a11 VF |
4832 | /** |
4833 | * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list | |
48311f46 VF |
4834 | * @dev: device |
4835 | * @iter: list_head ** of the current position | |
4836 | * | |
4837 | * Gets the next device from the dev's upper list, starting from iter | |
4838 | * position. The caller must hold RCU read lock. | |
4839 | */ | |
2f268f12 VF |
4840 | struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, |
4841 | struct list_head **iter) | |
48311f46 VF |
4842 | { |
4843 | struct netdev_adjacent *upper; | |
4844 | ||
85328240 | 4845 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
48311f46 VF |
4846 | |
4847 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4848 | ||
2f268f12 | 4849 | if (&upper->list == &dev->all_adj_list.upper) |
48311f46 VF |
4850 | return NULL; |
4851 | ||
4852 | *iter = &upper->list; | |
4853 | ||
4854 | return upper->dev; | |
4855 | } | |
2f268f12 | 4856 | EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu); |
48311f46 | 4857 | |
31088a11 VF |
4858 | /** |
4859 | * netdev_lower_get_next_private - Get the next ->private from the | |
4860 | * lower neighbour list | |
4861 | * @dev: device | |
4862 | * @iter: list_head ** of the current position | |
4863 | * | |
4864 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
4865 | * list, starting from iter position. The caller must hold either hold the | |
4866 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
4867 | * list will remain unchainged. | |
4868 | */ | |
4869 | void *netdev_lower_get_next_private(struct net_device *dev, | |
4870 | struct list_head **iter) | |
4871 | { | |
4872 | struct netdev_adjacent *lower; | |
4873 | ||
4874 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
4875 | ||
4876 | if (&lower->list == &dev->adj_list.lower) | |
4877 | return NULL; | |
4878 | ||
6859e7df | 4879 | *iter = lower->list.next; |
31088a11 VF |
4880 | |
4881 | return lower->private; | |
4882 | } | |
4883 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
4884 | ||
4885 | /** | |
4886 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
4887 | * lower neighbour list, RCU | |
4888 | * variant | |
4889 | * @dev: device | |
4890 | * @iter: list_head ** of the current position | |
4891 | * | |
4892 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
4893 | * list, starting from iter position. The caller must hold RCU read lock. | |
4894 | */ | |
4895 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
4896 | struct list_head **iter) | |
4897 | { | |
4898 | struct netdev_adjacent *lower; | |
4899 | ||
4900 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
4901 | ||
4902 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4903 | ||
4904 | if (&lower->list == &dev->adj_list.lower) | |
4905 | return NULL; | |
4906 | ||
6859e7df | 4907 | *iter = &lower->list; |
31088a11 VF |
4908 | |
4909 | return lower->private; | |
4910 | } | |
4911 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
4912 | ||
4085ebe8 VY |
4913 | /** |
4914 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
4915 | * list | |
4916 | * @dev: device | |
4917 | * @iter: list_head ** of the current position | |
4918 | * | |
4919 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
4920 | * list, starting from iter position. The caller must hold RTNL lock or | |
4921 | * its own locking that guarantees that the neighbour lower | |
4922 | * list will remain unchainged. | |
4923 | */ | |
4924 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
4925 | { | |
4926 | struct netdev_adjacent *lower; | |
4927 | ||
4928 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); | |
4929 | ||
4930 | if (&lower->list == &dev->adj_list.lower) | |
4931 | return NULL; | |
4932 | ||
4933 | *iter = &lower->list; | |
4934 | ||
4935 | return lower->dev; | |
4936 | } | |
4937 | EXPORT_SYMBOL(netdev_lower_get_next); | |
4938 | ||
e001bfad | 4939 | /** |
4940 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
4941 | * lower neighbour list, RCU | |
4942 | * variant | |
4943 | * @dev: device | |
4944 | * | |
4945 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
4946 | * list. The caller must hold RCU read lock. | |
4947 | */ | |
4948 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
4949 | { | |
4950 | struct netdev_adjacent *lower; | |
4951 | ||
4952 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
4953 | struct netdev_adjacent, list); | |
4954 | if (lower) | |
4955 | return lower->private; | |
4956 | return NULL; | |
4957 | } | |
4958 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
4959 | ||
9ff162a8 JP |
4960 | /** |
4961 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
4962 | * @dev: device | |
4963 | * | |
4964 | * Find a master upper device and return pointer to it or NULL in case | |
4965 | * it's not there. The caller must hold the RCU read lock. | |
4966 | */ | |
4967 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
4968 | { | |
aa9d8560 | 4969 | struct netdev_adjacent *upper; |
9ff162a8 | 4970 | |
2f268f12 | 4971 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 4972 | struct netdev_adjacent, list); |
9ff162a8 JP |
4973 | if (upper && likely(upper->master)) |
4974 | return upper->dev; | |
4975 | return NULL; | |
4976 | } | |
4977 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
4978 | ||
0a59f3a9 | 4979 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
4980 | struct net_device *adj_dev, |
4981 | struct list_head *dev_list) | |
4982 | { | |
4983 | char linkname[IFNAMSIZ+7]; | |
4984 | sprintf(linkname, dev_list == &dev->adj_list.upper ? | |
4985 | "upper_%s" : "lower_%s", adj_dev->name); | |
4986 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
4987 | linkname); | |
4988 | } | |
0a59f3a9 | 4989 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
4990 | char *name, |
4991 | struct list_head *dev_list) | |
4992 | { | |
4993 | char linkname[IFNAMSIZ+7]; | |
4994 | sprintf(linkname, dev_list == &dev->adj_list.upper ? | |
4995 | "upper_%s" : "lower_%s", name); | |
4996 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
4997 | } | |
4998 | ||
7ce64c79 AF |
4999 | static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
5000 | struct net_device *adj_dev, | |
5001 | struct list_head *dev_list) | |
5002 | { | |
5003 | return (dev_list == &dev->adj_list.upper || | |
5004 | dev_list == &dev->adj_list.lower) && | |
5005 | net_eq(dev_net(dev), dev_net(adj_dev)); | |
5006 | } | |
3ee32707 | 5007 | |
5d261913 VF |
5008 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
5009 | struct net_device *adj_dev, | |
7863c054 | 5010 | struct list_head *dev_list, |
402dae96 | 5011 | void *private, bool master) |
5d261913 VF |
5012 | { |
5013 | struct netdev_adjacent *adj; | |
842d67a7 | 5014 | int ret; |
5d261913 | 5015 | |
7863c054 | 5016 | adj = __netdev_find_adj(dev, adj_dev, dev_list); |
5d261913 VF |
5017 | |
5018 | if (adj) { | |
5d261913 VF |
5019 | adj->ref_nr++; |
5020 | return 0; | |
5021 | } | |
5022 | ||
5023 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
5024 | if (!adj) | |
5025 | return -ENOMEM; | |
5026 | ||
5027 | adj->dev = adj_dev; | |
5028 | adj->master = master; | |
5d261913 | 5029 | adj->ref_nr = 1; |
402dae96 | 5030 | adj->private = private; |
5d261913 | 5031 | dev_hold(adj_dev); |
2f268f12 VF |
5032 | |
5033 | pr_debug("dev_hold for %s, because of link added from %s to %s\n", | |
5034 | adj_dev->name, dev->name, adj_dev->name); | |
5d261913 | 5035 | |
7ce64c79 | 5036 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
3ee32707 | 5037 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
5831d66e VF |
5038 | if (ret) |
5039 | goto free_adj; | |
5040 | } | |
5041 | ||
7863c054 | 5042 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
5043 | if (master) { |
5044 | ret = sysfs_create_link(&(dev->dev.kobj), | |
5045 | &(adj_dev->dev.kobj), "master"); | |
5046 | if (ret) | |
5831d66e | 5047 | goto remove_symlinks; |
842d67a7 | 5048 | |
7863c054 | 5049 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 5050 | } else { |
7863c054 | 5051 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 5052 | } |
5d261913 VF |
5053 | |
5054 | return 0; | |
842d67a7 | 5055 | |
5831d66e | 5056 | remove_symlinks: |
7ce64c79 | 5057 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 5058 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
842d67a7 VF |
5059 | free_adj: |
5060 | kfree(adj); | |
974daef7 | 5061 | dev_put(adj_dev); |
842d67a7 VF |
5062 | |
5063 | return ret; | |
5d261913 VF |
5064 | } |
5065 | ||
1d143d9f | 5066 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
5067 | struct net_device *adj_dev, | |
5068 | struct list_head *dev_list) | |
5d261913 VF |
5069 | { |
5070 | struct netdev_adjacent *adj; | |
5071 | ||
7863c054 | 5072 | adj = __netdev_find_adj(dev, adj_dev, dev_list); |
5d261913 | 5073 | |
2f268f12 VF |
5074 | if (!adj) { |
5075 | pr_err("tried to remove device %s from %s\n", | |
5076 | dev->name, adj_dev->name); | |
5d261913 | 5077 | BUG(); |
2f268f12 | 5078 | } |
5d261913 VF |
5079 | |
5080 | if (adj->ref_nr > 1) { | |
2f268f12 VF |
5081 | pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name, |
5082 | adj->ref_nr-1); | |
5d261913 VF |
5083 | adj->ref_nr--; |
5084 | return; | |
5085 | } | |
5086 | ||
842d67a7 VF |
5087 | if (adj->master) |
5088 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
5089 | ||
7ce64c79 | 5090 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 5091 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
5831d66e | 5092 | |
5d261913 | 5093 | list_del_rcu(&adj->list); |
2f268f12 VF |
5094 | pr_debug("dev_put for %s, because link removed from %s to %s\n", |
5095 | adj_dev->name, dev->name, adj_dev->name); | |
5d261913 VF |
5096 | dev_put(adj_dev); |
5097 | kfree_rcu(adj, rcu); | |
5098 | } | |
5099 | ||
1d143d9f | 5100 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
5101 | struct net_device *upper_dev, | |
5102 | struct list_head *up_list, | |
5103 | struct list_head *down_list, | |
5104 | void *private, bool master) | |
5d261913 VF |
5105 | { |
5106 | int ret; | |
5107 | ||
402dae96 VF |
5108 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private, |
5109 | master); | |
5d261913 VF |
5110 | if (ret) |
5111 | return ret; | |
5112 | ||
402dae96 VF |
5113 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private, |
5114 | false); | |
5d261913 | 5115 | if (ret) { |
2f268f12 | 5116 | __netdev_adjacent_dev_remove(dev, upper_dev, up_list); |
5d261913 VF |
5117 | return ret; |
5118 | } | |
5119 | ||
5120 | return 0; | |
5121 | } | |
5122 | ||
1d143d9f | 5123 | static int __netdev_adjacent_dev_link(struct net_device *dev, |
5124 | struct net_device *upper_dev) | |
5d261913 | 5125 | { |
2f268f12 VF |
5126 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
5127 | &dev->all_adj_list.upper, | |
5128 | &upper_dev->all_adj_list.lower, | |
402dae96 | 5129 | NULL, false); |
5d261913 VF |
5130 | } |
5131 | ||
1d143d9f | 5132 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
5133 | struct net_device *upper_dev, | |
5134 | struct list_head *up_list, | |
5135 | struct list_head *down_list) | |
5d261913 | 5136 | { |
2f268f12 VF |
5137 | __netdev_adjacent_dev_remove(dev, upper_dev, up_list); |
5138 | __netdev_adjacent_dev_remove(upper_dev, dev, down_list); | |
5d261913 VF |
5139 | } |
5140 | ||
1d143d9f | 5141 | static void __netdev_adjacent_dev_unlink(struct net_device *dev, |
5142 | struct net_device *upper_dev) | |
5d261913 | 5143 | { |
2f268f12 VF |
5144 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, |
5145 | &dev->all_adj_list.upper, | |
5146 | &upper_dev->all_adj_list.lower); | |
5147 | } | |
5148 | ||
1d143d9f | 5149 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
5150 | struct net_device *upper_dev, | |
5151 | void *private, bool master) | |
2f268f12 VF |
5152 | { |
5153 | int ret = __netdev_adjacent_dev_link(dev, upper_dev); | |
5154 | ||
5155 | if (ret) | |
5156 | return ret; | |
5157 | ||
5158 | ret = __netdev_adjacent_dev_link_lists(dev, upper_dev, | |
5159 | &dev->adj_list.upper, | |
5160 | &upper_dev->adj_list.lower, | |
402dae96 | 5161 | private, master); |
2f268f12 VF |
5162 | if (ret) { |
5163 | __netdev_adjacent_dev_unlink(dev, upper_dev); | |
5164 | return ret; | |
5165 | } | |
5166 | ||
5167 | return 0; | |
5d261913 VF |
5168 | } |
5169 | ||
1d143d9f | 5170 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
5171 | struct net_device *upper_dev) | |
2f268f12 VF |
5172 | { |
5173 | __netdev_adjacent_dev_unlink(dev, upper_dev); | |
5174 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, | |
5175 | &dev->adj_list.upper, | |
5176 | &upper_dev->adj_list.lower); | |
5177 | } | |
5d261913 | 5178 | |
9ff162a8 | 5179 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 VF |
5180 | struct net_device *upper_dev, bool master, |
5181 | void *private) | |
9ff162a8 | 5182 | { |
5d261913 VF |
5183 | struct netdev_adjacent *i, *j, *to_i, *to_j; |
5184 | int ret = 0; | |
9ff162a8 JP |
5185 | |
5186 | ASSERT_RTNL(); | |
5187 | ||
5188 | if (dev == upper_dev) | |
5189 | return -EBUSY; | |
5190 | ||
5191 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
2f268f12 | 5192 | if (__netdev_find_adj(upper_dev, dev, &upper_dev->all_adj_list.upper)) |
9ff162a8 JP |
5193 | return -EBUSY; |
5194 | ||
2f268f12 | 5195 | if (__netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper)) |
9ff162a8 JP |
5196 | return -EEXIST; |
5197 | ||
5198 | if (master && netdev_master_upper_dev_get(dev)) | |
5199 | return -EBUSY; | |
5200 | ||
402dae96 VF |
5201 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private, |
5202 | master); | |
5d261913 VF |
5203 | if (ret) |
5204 | return ret; | |
9ff162a8 | 5205 | |
5d261913 | 5206 | /* Now that we linked these devs, make all the upper_dev's |
2f268f12 | 5207 | * all_adj_list.upper visible to every dev's all_adj_list.lower an |
5d261913 VF |
5208 | * versa, and don't forget the devices itself. All of these |
5209 | * links are non-neighbours. | |
5210 | */ | |
2f268f12 VF |
5211 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5212 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { | |
5213 | pr_debug("Interlinking %s with %s, non-neighbour\n", | |
5214 | i->dev->name, j->dev->name); | |
5d261913 VF |
5215 | ret = __netdev_adjacent_dev_link(i->dev, j->dev); |
5216 | if (ret) | |
5217 | goto rollback_mesh; | |
5218 | } | |
5219 | } | |
5220 | ||
5221 | /* add dev to every upper_dev's upper device */ | |
2f268f12 VF |
5222 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { |
5223 | pr_debug("linking %s's upper device %s with %s\n", | |
5224 | upper_dev->name, i->dev->name, dev->name); | |
5d261913 VF |
5225 | ret = __netdev_adjacent_dev_link(dev, i->dev); |
5226 | if (ret) | |
5227 | goto rollback_upper_mesh; | |
5228 | } | |
5229 | ||
5230 | /* add upper_dev to every dev's lower device */ | |
2f268f12 VF |
5231 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5232 | pr_debug("linking %s's lower device %s with %s\n", dev->name, | |
5233 | i->dev->name, upper_dev->name); | |
5d261913 VF |
5234 | ret = __netdev_adjacent_dev_link(i->dev, upper_dev); |
5235 | if (ret) | |
5236 | goto rollback_lower_mesh; | |
5237 | } | |
9ff162a8 | 5238 | |
42e52bf9 | 5239 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
9ff162a8 | 5240 | return 0; |
5d261913 VF |
5241 | |
5242 | rollback_lower_mesh: | |
5243 | to_i = i; | |
2f268f12 | 5244 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5d261913 VF |
5245 | if (i == to_i) |
5246 | break; | |
5247 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); | |
5248 | } | |
5249 | ||
5250 | i = NULL; | |
5251 | ||
5252 | rollback_upper_mesh: | |
5253 | to_i = i; | |
2f268f12 | 5254 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { |
5d261913 VF |
5255 | if (i == to_i) |
5256 | break; | |
5257 | __netdev_adjacent_dev_unlink(dev, i->dev); | |
5258 | } | |
5259 | ||
5260 | i = j = NULL; | |
5261 | ||
5262 | rollback_mesh: | |
5263 | to_i = i; | |
5264 | to_j = j; | |
2f268f12 VF |
5265 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5266 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { | |
5d261913 VF |
5267 | if (i == to_i && j == to_j) |
5268 | break; | |
5269 | __netdev_adjacent_dev_unlink(i->dev, j->dev); | |
5270 | } | |
5271 | if (i == to_i) | |
5272 | break; | |
5273 | } | |
5274 | ||
2f268f12 | 5275 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
5276 | |
5277 | return ret; | |
9ff162a8 JP |
5278 | } |
5279 | ||
5280 | /** | |
5281 | * netdev_upper_dev_link - Add a link to the upper device | |
5282 | * @dev: device | |
5283 | * @upper_dev: new upper device | |
5284 | * | |
5285 | * Adds a link to device which is upper to this one. The caller must hold | |
5286 | * the RTNL lock. On a failure a negative errno code is returned. | |
5287 | * On success the reference counts are adjusted and the function | |
5288 | * returns zero. | |
5289 | */ | |
5290 | int netdev_upper_dev_link(struct net_device *dev, | |
5291 | struct net_device *upper_dev) | |
5292 | { | |
402dae96 | 5293 | return __netdev_upper_dev_link(dev, upper_dev, false, NULL); |
9ff162a8 JP |
5294 | } |
5295 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
5296 | ||
5297 | /** | |
5298 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
5299 | * @dev: device | |
5300 | * @upper_dev: new upper device | |
5301 | * | |
5302 | * Adds a link to device which is upper to this one. In this case, only | |
5303 | * one master upper device can be linked, although other non-master devices | |
5304 | * might be linked as well. The caller must hold the RTNL lock. | |
5305 | * On a failure a negative errno code is returned. On success the reference | |
5306 | * counts are adjusted and the function returns zero. | |
5307 | */ | |
5308 | int netdev_master_upper_dev_link(struct net_device *dev, | |
5309 | struct net_device *upper_dev) | |
5310 | { | |
402dae96 | 5311 | return __netdev_upper_dev_link(dev, upper_dev, true, NULL); |
9ff162a8 JP |
5312 | } |
5313 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
5314 | ||
402dae96 VF |
5315 | int netdev_master_upper_dev_link_private(struct net_device *dev, |
5316 | struct net_device *upper_dev, | |
5317 | void *private) | |
5318 | { | |
5319 | return __netdev_upper_dev_link(dev, upper_dev, true, private); | |
5320 | } | |
5321 | EXPORT_SYMBOL(netdev_master_upper_dev_link_private); | |
5322 | ||
9ff162a8 JP |
5323 | /** |
5324 | * netdev_upper_dev_unlink - Removes a link to upper device | |
5325 | * @dev: device | |
5326 | * @upper_dev: new upper device | |
5327 | * | |
5328 | * Removes a link to device which is upper to this one. The caller must hold | |
5329 | * the RTNL lock. | |
5330 | */ | |
5331 | void netdev_upper_dev_unlink(struct net_device *dev, | |
5332 | struct net_device *upper_dev) | |
5333 | { | |
5d261913 | 5334 | struct netdev_adjacent *i, *j; |
9ff162a8 JP |
5335 | ASSERT_RTNL(); |
5336 | ||
2f268f12 | 5337 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
5338 | |
5339 | /* Here is the tricky part. We must remove all dev's lower | |
5340 | * devices from all upper_dev's upper devices and vice | |
5341 | * versa, to maintain the graph relationship. | |
5342 | */ | |
2f268f12 VF |
5343 | list_for_each_entry(i, &dev->all_adj_list.lower, list) |
5344 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) | |
5d261913 VF |
5345 | __netdev_adjacent_dev_unlink(i->dev, j->dev); |
5346 | ||
5347 | /* remove also the devices itself from lower/upper device | |
5348 | * list | |
5349 | */ | |
2f268f12 | 5350 | list_for_each_entry(i, &dev->all_adj_list.lower, list) |
5d261913 VF |
5351 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); |
5352 | ||
2f268f12 | 5353 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) |
5d261913 VF |
5354 | __netdev_adjacent_dev_unlink(dev, i->dev); |
5355 | ||
42e52bf9 | 5356 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
9ff162a8 JP |
5357 | } |
5358 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
5359 | ||
61bd3857 MS |
5360 | /** |
5361 | * netdev_bonding_info_change - Dispatch event about slave change | |
5362 | * @dev: device | |
4a26e453 | 5363 | * @bonding_info: info to dispatch |
61bd3857 MS |
5364 | * |
5365 | * Send NETDEV_BONDING_INFO to netdev notifiers with info. | |
5366 | * The caller must hold the RTNL lock. | |
5367 | */ | |
5368 | void netdev_bonding_info_change(struct net_device *dev, | |
5369 | struct netdev_bonding_info *bonding_info) | |
5370 | { | |
5371 | struct netdev_notifier_bonding_info info; | |
5372 | ||
5373 | memcpy(&info.bonding_info, bonding_info, | |
5374 | sizeof(struct netdev_bonding_info)); | |
5375 | call_netdevice_notifiers_info(NETDEV_BONDING_INFO, dev, | |
5376 | &info.info); | |
5377 | } | |
5378 | EXPORT_SYMBOL(netdev_bonding_info_change); | |
5379 | ||
2ce1ee17 | 5380 | static void netdev_adjacent_add_links(struct net_device *dev) |
4c75431a AF |
5381 | { |
5382 | struct netdev_adjacent *iter; | |
5383 | ||
5384 | struct net *net = dev_net(dev); | |
5385 | ||
5386 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
5387 | if (!net_eq(net,dev_net(iter->dev))) | |
5388 | continue; | |
5389 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5390 | &iter->dev->adj_list.lower); | |
5391 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
5392 | &dev->adj_list.upper); | |
5393 | } | |
5394 | ||
5395 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
5396 | if (!net_eq(net,dev_net(iter->dev))) | |
5397 | continue; | |
5398 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5399 | &iter->dev->adj_list.upper); | |
5400 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
5401 | &dev->adj_list.lower); | |
5402 | } | |
5403 | } | |
5404 | ||
2ce1ee17 | 5405 | static void netdev_adjacent_del_links(struct net_device *dev) |
4c75431a AF |
5406 | { |
5407 | struct netdev_adjacent *iter; | |
5408 | ||
5409 | struct net *net = dev_net(dev); | |
5410 | ||
5411 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
5412 | if (!net_eq(net,dev_net(iter->dev))) | |
5413 | continue; | |
5414 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
5415 | &iter->dev->adj_list.lower); | |
5416 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
5417 | &dev->adj_list.upper); | |
5418 | } | |
5419 | ||
5420 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
5421 | if (!net_eq(net,dev_net(iter->dev))) | |
5422 | continue; | |
5423 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
5424 | &iter->dev->adj_list.upper); | |
5425 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
5426 | &dev->adj_list.lower); | |
5427 | } | |
5428 | } | |
5429 | ||
5bb025fa | 5430 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 5431 | { |
5bb025fa | 5432 | struct netdev_adjacent *iter; |
402dae96 | 5433 | |
4c75431a AF |
5434 | struct net *net = dev_net(dev); |
5435 | ||
5bb025fa | 5436 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
4c75431a AF |
5437 | if (!net_eq(net,dev_net(iter->dev))) |
5438 | continue; | |
5bb025fa VF |
5439 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
5440 | &iter->dev->adj_list.lower); | |
5441 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5442 | &iter->dev->adj_list.lower); | |
5443 | } | |
402dae96 | 5444 | |
5bb025fa | 5445 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
4c75431a AF |
5446 | if (!net_eq(net,dev_net(iter->dev))) |
5447 | continue; | |
5bb025fa VF |
5448 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
5449 | &iter->dev->adj_list.upper); | |
5450 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5451 | &iter->dev->adj_list.upper); | |
5452 | } | |
402dae96 | 5453 | } |
402dae96 VF |
5454 | |
5455 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
5456 | struct net_device *lower_dev) | |
5457 | { | |
5458 | struct netdev_adjacent *lower; | |
5459 | ||
5460 | if (!lower_dev) | |
5461 | return NULL; | |
5462 | lower = __netdev_find_adj(dev, lower_dev, &dev->adj_list.lower); | |
5463 | if (!lower) | |
5464 | return NULL; | |
5465 | ||
5466 | return lower->private; | |
5467 | } | |
5468 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
5469 | ||
4085ebe8 VY |
5470 | |
5471 | int dev_get_nest_level(struct net_device *dev, | |
5472 | bool (*type_check)(struct net_device *dev)) | |
5473 | { | |
5474 | struct net_device *lower = NULL; | |
5475 | struct list_head *iter; | |
5476 | int max_nest = -1; | |
5477 | int nest; | |
5478 | ||
5479 | ASSERT_RTNL(); | |
5480 | ||
5481 | netdev_for_each_lower_dev(dev, lower, iter) { | |
5482 | nest = dev_get_nest_level(lower, type_check); | |
5483 | if (max_nest < nest) | |
5484 | max_nest = nest; | |
5485 | } | |
5486 | ||
5487 | if (type_check(dev)) | |
5488 | max_nest++; | |
5489 | ||
5490 | return max_nest; | |
5491 | } | |
5492 | EXPORT_SYMBOL(dev_get_nest_level); | |
5493 | ||
b6c40d68 PM |
5494 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
5495 | { | |
d314774c SH |
5496 | const struct net_device_ops *ops = dev->netdev_ops; |
5497 | ||
d2615bf4 | 5498 | if (ops->ndo_change_rx_flags) |
d314774c | 5499 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
5500 | } |
5501 | ||
991fb3f7 | 5502 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 5503 | { |
b536db93 | 5504 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
5505 | kuid_t uid; |
5506 | kgid_t gid; | |
1da177e4 | 5507 | |
24023451 PM |
5508 | ASSERT_RTNL(); |
5509 | ||
dad9b335 WC |
5510 | dev->flags |= IFF_PROMISC; |
5511 | dev->promiscuity += inc; | |
5512 | if (dev->promiscuity == 0) { | |
5513 | /* | |
5514 | * Avoid overflow. | |
5515 | * If inc causes overflow, untouch promisc and return error. | |
5516 | */ | |
5517 | if (inc < 0) | |
5518 | dev->flags &= ~IFF_PROMISC; | |
5519 | else { | |
5520 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
5521 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
5522 | dev->name); | |
dad9b335 WC |
5523 | return -EOVERFLOW; |
5524 | } | |
5525 | } | |
52609c0b | 5526 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
5527 | pr_info("device %s %s promiscuous mode\n", |
5528 | dev->name, | |
5529 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
5530 | if (audit_enabled) { |
5531 | current_uid_gid(&uid, &gid); | |
7759db82 KHK |
5532 | audit_log(current->audit_context, GFP_ATOMIC, |
5533 | AUDIT_ANOM_PROMISCUOUS, | |
5534 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
5535 | dev->name, (dev->flags & IFF_PROMISC), | |
5536 | (old_flags & IFF_PROMISC), | |
e1760bd5 | 5537 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
d04a48b0 EB |
5538 | from_kuid(&init_user_ns, uid), |
5539 | from_kgid(&init_user_ns, gid), | |
7759db82 | 5540 | audit_get_sessionid(current)); |
8192b0c4 | 5541 | } |
24023451 | 5542 | |
b6c40d68 | 5543 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 5544 | } |
991fb3f7 ND |
5545 | if (notify) |
5546 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 5547 | return 0; |
1da177e4 LT |
5548 | } |
5549 | ||
4417da66 PM |
5550 | /** |
5551 | * dev_set_promiscuity - update promiscuity count on a device | |
5552 | * @dev: device | |
5553 | * @inc: modifier | |
5554 | * | |
5555 | * Add or remove promiscuity from a device. While the count in the device | |
5556 | * remains above zero the interface remains promiscuous. Once it hits zero | |
5557 | * the device reverts back to normal filtering operation. A negative inc | |
5558 | * value is used to drop promiscuity on the device. | |
dad9b335 | 5559 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 5560 | */ |
dad9b335 | 5561 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 5562 | { |
b536db93 | 5563 | unsigned int old_flags = dev->flags; |
dad9b335 | 5564 | int err; |
4417da66 | 5565 | |
991fb3f7 | 5566 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 5567 | if (err < 0) |
dad9b335 | 5568 | return err; |
4417da66 PM |
5569 | if (dev->flags != old_flags) |
5570 | dev_set_rx_mode(dev); | |
dad9b335 | 5571 | return err; |
4417da66 | 5572 | } |
d1b19dff | 5573 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 5574 | |
991fb3f7 | 5575 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 5576 | { |
991fb3f7 | 5577 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 5578 | |
24023451 PM |
5579 | ASSERT_RTNL(); |
5580 | ||
1da177e4 | 5581 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
5582 | dev->allmulti += inc; |
5583 | if (dev->allmulti == 0) { | |
5584 | /* | |
5585 | * Avoid overflow. | |
5586 | * If inc causes overflow, untouch allmulti and return error. | |
5587 | */ | |
5588 | if (inc < 0) | |
5589 | dev->flags &= ~IFF_ALLMULTI; | |
5590 | else { | |
5591 | dev->allmulti -= inc; | |
7b6cd1ce JP |
5592 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
5593 | dev->name); | |
dad9b335 WC |
5594 | return -EOVERFLOW; |
5595 | } | |
5596 | } | |
24023451 | 5597 | if (dev->flags ^ old_flags) { |
b6c40d68 | 5598 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 5599 | dev_set_rx_mode(dev); |
991fb3f7 ND |
5600 | if (notify) |
5601 | __dev_notify_flags(dev, old_flags, | |
5602 | dev->gflags ^ old_gflags); | |
24023451 | 5603 | } |
dad9b335 | 5604 | return 0; |
4417da66 | 5605 | } |
991fb3f7 ND |
5606 | |
5607 | /** | |
5608 | * dev_set_allmulti - update allmulti count on a device | |
5609 | * @dev: device | |
5610 | * @inc: modifier | |
5611 | * | |
5612 | * Add or remove reception of all multicast frames to a device. While the | |
5613 | * count in the device remains above zero the interface remains listening | |
5614 | * to all interfaces. Once it hits zero the device reverts back to normal | |
5615 | * filtering operation. A negative @inc value is used to drop the counter | |
5616 | * when releasing a resource needing all multicasts. | |
5617 | * Return 0 if successful or a negative errno code on error. | |
5618 | */ | |
5619 | ||
5620 | int dev_set_allmulti(struct net_device *dev, int inc) | |
5621 | { | |
5622 | return __dev_set_allmulti(dev, inc, true); | |
5623 | } | |
d1b19dff | 5624 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
5625 | |
5626 | /* | |
5627 | * Upload unicast and multicast address lists to device and | |
5628 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 5629 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
5630 | * are present. |
5631 | */ | |
5632 | void __dev_set_rx_mode(struct net_device *dev) | |
5633 | { | |
d314774c SH |
5634 | const struct net_device_ops *ops = dev->netdev_ops; |
5635 | ||
4417da66 PM |
5636 | /* dev_open will call this function so the list will stay sane. */ |
5637 | if (!(dev->flags&IFF_UP)) | |
5638 | return; | |
5639 | ||
5640 | if (!netif_device_present(dev)) | |
40b77c94 | 5641 | return; |
4417da66 | 5642 | |
01789349 | 5643 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
5644 | /* Unicast addresses changes may only happen under the rtnl, |
5645 | * therefore calling __dev_set_promiscuity here is safe. | |
5646 | */ | |
32e7bfc4 | 5647 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 5648 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 5649 | dev->uc_promisc = true; |
32e7bfc4 | 5650 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 5651 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 5652 | dev->uc_promisc = false; |
4417da66 | 5653 | } |
4417da66 | 5654 | } |
01789349 JP |
5655 | |
5656 | if (ops->ndo_set_rx_mode) | |
5657 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
5658 | } |
5659 | ||
5660 | void dev_set_rx_mode(struct net_device *dev) | |
5661 | { | |
b9e40857 | 5662 | netif_addr_lock_bh(dev); |
4417da66 | 5663 | __dev_set_rx_mode(dev); |
b9e40857 | 5664 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
5665 | } |
5666 | ||
f0db275a SH |
5667 | /** |
5668 | * dev_get_flags - get flags reported to userspace | |
5669 | * @dev: device | |
5670 | * | |
5671 | * Get the combination of flag bits exported through APIs to userspace. | |
5672 | */ | |
95c96174 | 5673 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 5674 | { |
95c96174 | 5675 | unsigned int flags; |
1da177e4 LT |
5676 | |
5677 | flags = (dev->flags & ~(IFF_PROMISC | | |
5678 | IFF_ALLMULTI | | |
b00055aa SR |
5679 | IFF_RUNNING | |
5680 | IFF_LOWER_UP | | |
5681 | IFF_DORMANT)) | | |
1da177e4 LT |
5682 | (dev->gflags & (IFF_PROMISC | |
5683 | IFF_ALLMULTI)); | |
5684 | ||
b00055aa SR |
5685 | if (netif_running(dev)) { |
5686 | if (netif_oper_up(dev)) | |
5687 | flags |= IFF_RUNNING; | |
5688 | if (netif_carrier_ok(dev)) | |
5689 | flags |= IFF_LOWER_UP; | |
5690 | if (netif_dormant(dev)) | |
5691 | flags |= IFF_DORMANT; | |
5692 | } | |
1da177e4 LT |
5693 | |
5694 | return flags; | |
5695 | } | |
d1b19dff | 5696 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 5697 | |
bd380811 | 5698 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
1da177e4 | 5699 | { |
b536db93 | 5700 | unsigned int old_flags = dev->flags; |
bd380811 | 5701 | int ret; |
1da177e4 | 5702 | |
24023451 PM |
5703 | ASSERT_RTNL(); |
5704 | ||
1da177e4 LT |
5705 | /* |
5706 | * Set the flags on our device. | |
5707 | */ | |
5708 | ||
5709 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
5710 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
5711 | IFF_AUTOMEDIA)) | | |
5712 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
5713 | IFF_ALLMULTI)); | |
5714 | ||
5715 | /* | |
5716 | * Load in the correct multicast list now the flags have changed. | |
5717 | */ | |
5718 | ||
b6c40d68 PM |
5719 | if ((old_flags ^ flags) & IFF_MULTICAST) |
5720 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 5721 | |
4417da66 | 5722 | dev_set_rx_mode(dev); |
1da177e4 LT |
5723 | |
5724 | /* | |
5725 | * Have we downed the interface. We handle IFF_UP ourselves | |
5726 | * according to user attempts to set it, rather than blindly | |
5727 | * setting it. | |
5728 | */ | |
5729 | ||
5730 | ret = 0; | |
d215d10f | 5731 | if ((old_flags ^ flags) & IFF_UP) |
bd380811 | 5732 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
1da177e4 | 5733 | |
1da177e4 | 5734 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 5735 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 5736 | unsigned int old_flags = dev->flags; |
d1b19dff | 5737 | |
1da177e4 | 5738 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
5739 | |
5740 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
5741 | if (dev->flags != old_flags) | |
5742 | dev_set_rx_mode(dev); | |
1da177e4 LT |
5743 | } |
5744 | ||
5745 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
5746 | is important. Some (broken) drivers set IFF_PROMISC, when | |
5747 | IFF_ALLMULTI is requested not asking us and not reporting. | |
5748 | */ | |
5749 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
5750 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
5751 | ||
1da177e4 | 5752 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 5753 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
5754 | } |
5755 | ||
bd380811 PM |
5756 | return ret; |
5757 | } | |
5758 | ||
a528c219 ND |
5759 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
5760 | unsigned int gchanges) | |
bd380811 PM |
5761 | { |
5762 | unsigned int changes = dev->flags ^ old_flags; | |
5763 | ||
a528c219 | 5764 | if (gchanges) |
7f294054 | 5765 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 5766 | |
bd380811 PM |
5767 | if (changes & IFF_UP) { |
5768 | if (dev->flags & IFF_UP) | |
5769 | call_netdevice_notifiers(NETDEV_UP, dev); | |
5770 | else | |
5771 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
5772 | } | |
5773 | ||
5774 | if (dev->flags & IFF_UP && | |
be9efd36 JP |
5775 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
5776 | struct netdev_notifier_change_info change_info; | |
5777 | ||
5778 | change_info.flags_changed = changes; | |
5779 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
5780 | &change_info.info); | |
5781 | } | |
bd380811 PM |
5782 | } |
5783 | ||
5784 | /** | |
5785 | * dev_change_flags - change device settings | |
5786 | * @dev: device | |
5787 | * @flags: device state flags | |
5788 | * | |
5789 | * Change settings on device based state flags. The flags are | |
5790 | * in the userspace exported format. | |
5791 | */ | |
b536db93 | 5792 | int dev_change_flags(struct net_device *dev, unsigned int flags) |
bd380811 | 5793 | { |
b536db93 | 5794 | int ret; |
991fb3f7 | 5795 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 PM |
5796 | |
5797 | ret = __dev_change_flags(dev, flags); | |
5798 | if (ret < 0) | |
5799 | return ret; | |
5800 | ||
991fb3f7 | 5801 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 5802 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
5803 | return ret; |
5804 | } | |
d1b19dff | 5805 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 5806 | |
2315dc91 VF |
5807 | static int __dev_set_mtu(struct net_device *dev, int new_mtu) |
5808 | { | |
5809 | const struct net_device_ops *ops = dev->netdev_ops; | |
5810 | ||
5811 | if (ops->ndo_change_mtu) | |
5812 | return ops->ndo_change_mtu(dev, new_mtu); | |
5813 | ||
5814 | dev->mtu = new_mtu; | |
5815 | return 0; | |
5816 | } | |
5817 | ||
f0db275a SH |
5818 | /** |
5819 | * dev_set_mtu - Change maximum transfer unit | |
5820 | * @dev: device | |
5821 | * @new_mtu: new transfer unit | |
5822 | * | |
5823 | * Change the maximum transfer size of the network device. | |
5824 | */ | |
1da177e4 LT |
5825 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
5826 | { | |
2315dc91 | 5827 | int err, orig_mtu; |
1da177e4 LT |
5828 | |
5829 | if (new_mtu == dev->mtu) | |
5830 | return 0; | |
5831 | ||
5832 | /* MTU must be positive. */ | |
5833 | if (new_mtu < 0) | |
5834 | return -EINVAL; | |
5835 | ||
5836 | if (!netif_device_present(dev)) | |
5837 | return -ENODEV; | |
5838 | ||
1d486bfb VF |
5839 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
5840 | err = notifier_to_errno(err); | |
5841 | if (err) | |
5842 | return err; | |
d314774c | 5843 | |
2315dc91 VF |
5844 | orig_mtu = dev->mtu; |
5845 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 5846 | |
2315dc91 VF |
5847 | if (!err) { |
5848 | err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
5849 | err = notifier_to_errno(err); | |
5850 | if (err) { | |
5851 | /* setting mtu back and notifying everyone again, | |
5852 | * so that they have a chance to revert changes. | |
5853 | */ | |
5854 | __dev_set_mtu(dev, orig_mtu); | |
5855 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
5856 | } | |
5857 | } | |
1da177e4 LT |
5858 | return err; |
5859 | } | |
d1b19dff | 5860 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 5861 | |
cbda10fa VD |
5862 | /** |
5863 | * dev_set_group - Change group this device belongs to | |
5864 | * @dev: device | |
5865 | * @new_group: group this device should belong to | |
5866 | */ | |
5867 | void dev_set_group(struct net_device *dev, int new_group) | |
5868 | { | |
5869 | dev->group = new_group; | |
5870 | } | |
5871 | EXPORT_SYMBOL(dev_set_group); | |
5872 | ||
f0db275a SH |
5873 | /** |
5874 | * dev_set_mac_address - Change Media Access Control Address | |
5875 | * @dev: device | |
5876 | * @sa: new address | |
5877 | * | |
5878 | * Change the hardware (MAC) address of the device | |
5879 | */ | |
1da177e4 LT |
5880 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
5881 | { | |
d314774c | 5882 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
5883 | int err; |
5884 | ||
d314774c | 5885 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
5886 | return -EOPNOTSUPP; |
5887 | if (sa->sa_family != dev->type) | |
5888 | return -EINVAL; | |
5889 | if (!netif_device_present(dev)) | |
5890 | return -ENODEV; | |
d314774c | 5891 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
5892 | if (err) |
5893 | return err; | |
fbdeca2d | 5894 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 5895 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 5896 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 5897 | return 0; |
1da177e4 | 5898 | } |
d1b19dff | 5899 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 5900 | |
4bf84c35 JP |
5901 | /** |
5902 | * dev_change_carrier - Change device carrier | |
5903 | * @dev: device | |
691b3b7e | 5904 | * @new_carrier: new value |
4bf84c35 JP |
5905 | * |
5906 | * Change device carrier | |
5907 | */ | |
5908 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
5909 | { | |
5910 | const struct net_device_ops *ops = dev->netdev_ops; | |
5911 | ||
5912 | if (!ops->ndo_change_carrier) | |
5913 | return -EOPNOTSUPP; | |
5914 | if (!netif_device_present(dev)) | |
5915 | return -ENODEV; | |
5916 | return ops->ndo_change_carrier(dev, new_carrier); | |
5917 | } | |
5918 | EXPORT_SYMBOL(dev_change_carrier); | |
5919 | ||
66b52b0d JP |
5920 | /** |
5921 | * dev_get_phys_port_id - Get device physical port ID | |
5922 | * @dev: device | |
5923 | * @ppid: port ID | |
5924 | * | |
5925 | * Get device physical port ID | |
5926 | */ | |
5927 | int dev_get_phys_port_id(struct net_device *dev, | |
02637fce | 5928 | struct netdev_phys_item_id *ppid) |
66b52b0d JP |
5929 | { |
5930 | const struct net_device_ops *ops = dev->netdev_ops; | |
5931 | ||
5932 | if (!ops->ndo_get_phys_port_id) | |
5933 | return -EOPNOTSUPP; | |
5934 | return ops->ndo_get_phys_port_id(dev, ppid); | |
5935 | } | |
5936 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
5937 | ||
db24a904 DA |
5938 | /** |
5939 | * dev_get_phys_port_name - Get device physical port name | |
5940 | * @dev: device | |
5941 | * @name: port name | |
5942 | * | |
5943 | * Get device physical port name | |
5944 | */ | |
5945 | int dev_get_phys_port_name(struct net_device *dev, | |
5946 | char *name, size_t len) | |
5947 | { | |
5948 | const struct net_device_ops *ops = dev->netdev_ops; | |
5949 | ||
5950 | if (!ops->ndo_get_phys_port_name) | |
5951 | return -EOPNOTSUPP; | |
5952 | return ops->ndo_get_phys_port_name(dev, name, len); | |
5953 | } | |
5954 | EXPORT_SYMBOL(dev_get_phys_port_name); | |
5955 | ||
1da177e4 LT |
5956 | /** |
5957 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 5958 | * @net: the applicable net namespace |
1da177e4 LT |
5959 | * |
5960 | * Returns a suitable unique value for a new device interface | |
5961 | * number. The caller must hold the rtnl semaphore or the | |
5962 | * dev_base_lock to be sure it remains unique. | |
5963 | */ | |
881d966b | 5964 | static int dev_new_index(struct net *net) |
1da177e4 | 5965 | { |
aa79e66e | 5966 | int ifindex = net->ifindex; |
1da177e4 LT |
5967 | for (;;) { |
5968 | if (++ifindex <= 0) | |
5969 | ifindex = 1; | |
881d966b | 5970 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 5971 | return net->ifindex = ifindex; |
1da177e4 LT |
5972 | } |
5973 | } | |
5974 | ||
1da177e4 | 5975 | /* Delayed registration/unregisteration */ |
3b5b34fd | 5976 | static LIST_HEAD(net_todo_list); |
200b916f | 5977 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 5978 | |
6f05f629 | 5979 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 5980 | { |
1da177e4 | 5981 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 5982 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
5983 | } |
5984 | ||
9b5e383c | 5985 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 5986 | { |
e93737b0 | 5987 | struct net_device *dev, *tmp; |
5cde2829 | 5988 | LIST_HEAD(close_head); |
9b5e383c | 5989 | |
93ee31f1 DL |
5990 | BUG_ON(dev_boot_phase); |
5991 | ASSERT_RTNL(); | |
5992 | ||
e93737b0 | 5993 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 5994 | /* Some devices call without registering |
e93737b0 KK |
5995 | * for initialization unwind. Remove those |
5996 | * devices and proceed with the remaining. | |
9b5e383c ED |
5997 | */ |
5998 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
7b6cd1ce JP |
5999 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
6000 | dev->name, dev); | |
93ee31f1 | 6001 | |
9b5e383c | 6002 | WARN_ON(1); |
e93737b0 KK |
6003 | list_del(&dev->unreg_list); |
6004 | continue; | |
9b5e383c | 6005 | } |
449f4544 | 6006 | dev->dismantle = true; |
9b5e383c | 6007 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 6008 | } |
93ee31f1 | 6009 | |
44345724 | 6010 | /* If device is running, close it first. */ |
5cde2829 EB |
6011 | list_for_each_entry(dev, head, unreg_list) |
6012 | list_add_tail(&dev->close_list, &close_head); | |
99c4a26a | 6013 | dev_close_many(&close_head, true); |
93ee31f1 | 6014 | |
44345724 | 6015 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
6016 | /* And unlink it from device chain. */ |
6017 | unlist_netdevice(dev); | |
93ee31f1 | 6018 | |
9b5e383c ED |
6019 | dev->reg_state = NETREG_UNREGISTERING; |
6020 | } | |
93ee31f1 DL |
6021 | |
6022 | synchronize_net(); | |
6023 | ||
9b5e383c | 6024 | list_for_each_entry(dev, head, unreg_list) { |
395eea6c MB |
6025 | struct sk_buff *skb = NULL; |
6026 | ||
9b5e383c ED |
6027 | /* Shutdown queueing discipline. */ |
6028 | dev_shutdown(dev); | |
93ee31f1 DL |
6029 | |
6030 | ||
9b5e383c ED |
6031 | /* Notify protocols, that we are about to destroy |
6032 | this device. They should clean all the things. | |
6033 | */ | |
6034 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
93ee31f1 | 6035 | |
395eea6c MB |
6036 | if (!dev->rtnl_link_ops || |
6037 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
6038 | skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, | |
6039 | GFP_KERNEL); | |
6040 | ||
9b5e383c ED |
6041 | /* |
6042 | * Flush the unicast and multicast chains | |
6043 | */ | |
a748ee24 | 6044 | dev_uc_flush(dev); |
22bedad3 | 6045 | dev_mc_flush(dev); |
93ee31f1 | 6046 | |
9b5e383c ED |
6047 | if (dev->netdev_ops->ndo_uninit) |
6048 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 6049 | |
395eea6c MB |
6050 | if (skb) |
6051 | rtmsg_ifinfo_send(skb, dev, GFP_KERNEL); | |
56bfa7ee | 6052 | |
9ff162a8 JP |
6053 | /* Notifier chain MUST detach us all upper devices. */ |
6054 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
93ee31f1 | 6055 | |
9b5e383c ED |
6056 | /* Remove entries from kobject tree */ |
6057 | netdev_unregister_kobject(dev); | |
024e9679 AD |
6058 | #ifdef CONFIG_XPS |
6059 | /* Remove XPS queueing entries */ | |
6060 | netif_reset_xps_queues_gt(dev, 0); | |
6061 | #endif | |
9b5e383c | 6062 | } |
93ee31f1 | 6063 | |
850a545b | 6064 | synchronize_net(); |
395264d5 | 6065 | |
a5ee1551 | 6066 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
6067 | dev_put(dev); |
6068 | } | |
6069 | ||
6070 | static void rollback_registered(struct net_device *dev) | |
6071 | { | |
6072 | LIST_HEAD(single); | |
6073 | ||
6074 | list_add(&dev->unreg_list, &single); | |
6075 | rollback_registered_many(&single); | |
ceaaec98 | 6076 | list_del(&single); |
93ee31f1 DL |
6077 | } |
6078 | ||
c8f44aff MM |
6079 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
6080 | netdev_features_t features) | |
b63365a2 | 6081 | { |
57422dc5 MM |
6082 | /* Fix illegal checksum combinations */ |
6083 | if ((features & NETIF_F_HW_CSUM) && | |
6084 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 6085 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
6086 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
6087 | } | |
6088 | ||
b63365a2 | 6089 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 6090 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 6091 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 6092 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
6093 | } |
6094 | ||
ec5f0615 PS |
6095 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
6096 | !(features & NETIF_F_IP_CSUM)) { | |
6097 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
6098 | features &= ~NETIF_F_TSO; | |
6099 | features &= ~NETIF_F_TSO_ECN; | |
6100 | } | |
6101 | ||
6102 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
6103 | !(features & NETIF_F_IPV6_CSUM)) { | |
6104 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
6105 | features &= ~NETIF_F_TSO6; | |
6106 | } | |
6107 | ||
31d8b9e0 BH |
6108 | /* TSO ECN requires that TSO is present as well. */ |
6109 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
6110 | features &= ~NETIF_F_TSO_ECN; | |
6111 | ||
212b573f MM |
6112 | /* Software GSO depends on SG. */ |
6113 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 6114 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
6115 | features &= ~NETIF_F_GSO; |
6116 | } | |
6117 | ||
acd1130e | 6118 | /* UFO needs SG and checksumming */ |
b63365a2 | 6119 | if (features & NETIF_F_UFO) { |
79032644 MM |
6120 | /* maybe split UFO into V4 and V6? */ |
6121 | if (!((features & NETIF_F_GEN_CSUM) || | |
6122 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) | |
6123 | == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 6124 | netdev_dbg(dev, |
acd1130e | 6125 | "Dropping NETIF_F_UFO since no checksum offload features.\n"); |
b63365a2 HX |
6126 | features &= ~NETIF_F_UFO; |
6127 | } | |
6128 | ||
6129 | if (!(features & NETIF_F_SG)) { | |
6f404e44 | 6130 | netdev_dbg(dev, |
acd1130e | 6131 | "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n"); |
b63365a2 HX |
6132 | features &= ~NETIF_F_UFO; |
6133 | } | |
6134 | } | |
6135 | ||
d0290214 JP |
6136 | #ifdef CONFIG_NET_RX_BUSY_POLL |
6137 | if (dev->netdev_ops->ndo_busy_poll) | |
6138 | features |= NETIF_F_BUSY_POLL; | |
6139 | else | |
6140 | #endif | |
6141 | features &= ~NETIF_F_BUSY_POLL; | |
6142 | ||
b63365a2 HX |
6143 | return features; |
6144 | } | |
b63365a2 | 6145 | |
6cb6a27c | 6146 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 6147 | { |
c8f44aff | 6148 | netdev_features_t features; |
5455c699 MM |
6149 | int err = 0; |
6150 | ||
87267485 MM |
6151 | ASSERT_RTNL(); |
6152 | ||
5455c699 MM |
6153 | features = netdev_get_wanted_features(dev); |
6154 | ||
6155 | if (dev->netdev_ops->ndo_fix_features) | |
6156 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
6157 | ||
6158 | /* driver might be less strict about feature dependencies */ | |
6159 | features = netdev_fix_features(dev, features); | |
6160 | ||
6161 | if (dev->features == features) | |
6cb6a27c | 6162 | return 0; |
5455c699 | 6163 | |
c8f44aff MM |
6164 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
6165 | &dev->features, &features); | |
5455c699 MM |
6166 | |
6167 | if (dev->netdev_ops->ndo_set_features) | |
6168 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
6169 | ||
6cb6a27c | 6170 | if (unlikely(err < 0)) { |
5455c699 | 6171 | netdev_err(dev, |
c8f44aff MM |
6172 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
6173 | err, &features, &dev->features); | |
6cb6a27c MM |
6174 | return -1; |
6175 | } | |
6176 | ||
6177 | if (!err) | |
6178 | dev->features = features; | |
6179 | ||
6180 | return 1; | |
6181 | } | |
6182 | ||
afe12cc8 MM |
6183 | /** |
6184 | * netdev_update_features - recalculate device features | |
6185 | * @dev: the device to check | |
6186 | * | |
6187 | * Recalculate dev->features set and send notifications if it | |
6188 | * has changed. Should be called after driver or hardware dependent | |
6189 | * conditions might have changed that influence the features. | |
6190 | */ | |
6cb6a27c MM |
6191 | void netdev_update_features(struct net_device *dev) |
6192 | { | |
6193 | if (__netdev_update_features(dev)) | |
6194 | netdev_features_change(dev); | |
5455c699 MM |
6195 | } |
6196 | EXPORT_SYMBOL(netdev_update_features); | |
6197 | ||
afe12cc8 MM |
6198 | /** |
6199 | * netdev_change_features - recalculate device features | |
6200 | * @dev: the device to check | |
6201 | * | |
6202 | * Recalculate dev->features set and send notifications even | |
6203 | * if they have not changed. Should be called instead of | |
6204 | * netdev_update_features() if also dev->vlan_features might | |
6205 | * have changed to allow the changes to be propagated to stacked | |
6206 | * VLAN devices. | |
6207 | */ | |
6208 | void netdev_change_features(struct net_device *dev) | |
6209 | { | |
6210 | __netdev_update_features(dev); | |
6211 | netdev_features_change(dev); | |
6212 | } | |
6213 | EXPORT_SYMBOL(netdev_change_features); | |
6214 | ||
fc4a7489 PM |
6215 | /** |
6216 | * netif_stacked_transfer_operstate - transfer operstate | |
6217 | * @rootdev: the root or lower level device to transfer state from | |
6218 | * @dev: the device to transfer operstate to | |
6219 | * | |
6220 | * Transfer operational state from root to device. This is normally | |
6221 | * called when a stacking relationship exists between the root | |
6222 | * device and the device(a leaf device). | |
6223 | */ | |
6224 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
6225 | struct net_device *dev) | |
6226 | { | |
6227 | if (rootdev->operstate == IF_OPER_DORMANT) | |
6228 | netif_dormant_on(dev); | |
6229 | else | |
6230 | netif_dormant_off(dev); | |
6231 | ||
6232 | if (netif_carrier_ok(rootdev)) { | |
6233 | if (!netif_carrier_ok(dev)) | |
6234 | netif_carrier_on(dev); | |
6235 | } else { | |
6236 | if (netif_carrier_ok(dev)) | |
6237 | netif_carrier_off(dev); | |
6238 | } | |
6239 | } | |
6240 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
6241 | ||
a953be53 | 6242 | #ifdef CONFIG_SYSFS |
1b4bf461 ED |
6243 | static int netif_alloc_rx_queues(struct net_device *dev) |
6244 | { | |
1b4bf461 | 6245 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 6246 | struct netdev_rx_queue *rx; |
10595902 | 6247 | size_t sz = count * sizeof(*rx); |
1b4bf461 | 6248 | |
bd25fa7b | 6249 | BUG_ON(count < 1); |
1b4bf461 | 6250 | |
10595902 PG |
6251 | rx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
6252 | if (!rx) { | |
6253 | rx = vzalloc(sz); | |
6254 | if (!rx) | |
6255 | return -ENOMEM; | |
6256 | } | |
bd25fa7b TH |
6257 | dev->_rx = rx; |
6258 | ||
bd25fa7b | 6259 | for (i = 0; i < count; i++) |
fe822240 | 6260 | rx[i].dev = dev; |
1b4bf461 ED |
6261 | return 0; |
6262 | } | |
bf264145 | 6263 | #endif |
1b4bf461 | 6264 | |
aa942104 CG |
6265 | static void netdev_init_one_queue(struct net_device *dev, |
6266 | struct netdev_queue *queue, void *_unused) | |
6267 | { | |
6268 | /* Initialize queue lock */ | |
6269 | spin_lock_init(&queue->_xmit_lock); | |
6270 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); | |
6271 | queue->xmit_lock_owner = -1; | |
b236da69 | 6272 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 6273 | queue->dev = dev; |
114cf580 TH |
6274 | #ifdef CONFIG_BQL |
6275 | dql_init(&queue->dql, HZ); | |
6276 | #endif | |
aa942104 CG |
6277 | } |
6278 | ||
60877a32 ED |
6279 | static void netif_free_tx_queues(struct net_device *dev) |
6280 | { | |
4cb28970 | 6281 | kvfree(dev->_tx); |
60877a32 ED |
6282 | } |
6283 | ||
e6484930 TH |
6284 | static int netif_alloc_netdev_queues(struct net_device *dev) |
6285 | { | |
6286 | unsigned int count = dev->num_tx_queues; | |
6287 | struct netdev_queue *tx; | |
60877a32 | 6288 | size_t sz = count * sizeof(*tx); |
e6484930 | 6289 | |
60877a32 | 6290 | BUG_ON(count < 1 || count > 0xffff); |
62b5942a | 6291 | |
60877a32 ED |
6292 | tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
6293 | if (!tx) { | |
6294 | tx = vzalloc(sz); | |
6295 | if (!tx) | |
6296 | return -ENOMEM; | |
6297 | } | |
e6484930 | 6298 | dev->_tx = tx; |
1d24eb48 | 6299 | |
e6484930 TH |
6300 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
6301 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
6302 | |
6303 | return 0; | |
e6484930 TH |
6304 | } |
6305 | ||
1da177e4 LT |
6306 | /** |
6307 | * register_netdevice - register a network device | |
6308 | * @dev: device to register | |
6309 | * | |
6310 | * Take a completed network device structure and add it to the kernel | |
6311 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
6312 | * chain. 0 is returned on success. A negative errno code is returned | |
6313 | * on a failure to set up the device, or if the name is a duplicate. | |
6314 | * | |
6315 | * Callers must hold the rtnl semaphore. You may want | |
6316 | * register_netdev() instead of this. | |
6317 | * | |
6318 | * BUGS: | |
6319 | * The locking appears insufficient to guarantee two parallel registers | |
6320 | * will not get the same name. | |
6321 | */ | |
6322 | ||
6323 | int register_netdevice(struct net_device *dev) | |
6324 | { | |
1da177e4 | 6325 | int ret; |
d314774c | 6326 | struct net *net = dev_net(dev); |
1da177e4 LT |
6327 | |
6328 | BUG_ON(dev_boot_phase); | |
6329 | ASSERT_RTNL(); | |
6330 | ||
b17a7c17 SH |
6331 | might_sleep(); |
6332 | ||
1da177e4 LT |
6333 | /* When net_device's are persistent, this will be fatal. */ |
6334 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 6335 | BUG_ON(!net); |
1da177e4 | 6336 | |
f1f28aa3 | 6337 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 6338 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 6339 | |
828de4f6 | 6340 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
6341 | if (ret < 0) |
6342 | goto out; | |
6343 | ||
1da177e4 | 6344 | /* Init, if this function is available */ |
d314774c SH |
6345 | if (dev->netdev_ops->ndo_init) { |
6346 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
6347 | if (ret) { |
6348 | if (ret > 0) | |
6349 | ret = -EIO; | |
90833aa4 | 6350 | goto out; |
1da177e4 LT |
6351 | } |
6352 | } | |
4ec93edb | 6353 | |
f646968f PM |
6354 | if (((dev->hw_features | dev->features) & |
6355 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
6356 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
6357 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
6358 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
6359 | ret = -EINVAL; | |
6360 | goto err_uninit; | |
6361 | } | |
6362 | ||
9c7dafbf PE |
6363 | ret = -EBUSY; |
6364 | if (!dev->ifindex) | |
6365 | dev->ifindex = dev_new_index(net); | |
6366 | else if (__dev_get_by_index(net, dev->ifindex)) | |
6367 | goto err_uninit; | |
6368 | ||
5455c699 MM |
6369 | /* Transfer changeable features to wanted_features and enable |
6370 | * software offloads (GSO and GRO). | |
6371 | */ | |
6372 | dev->hw_features |= NETIF_F_SOFT_FEATURES; | |
14d1232f MM |
6373 | dev->features |= NETIF_F_SOFT_FEATURES; |
6374 | dev->wanted_features = dev->features & dev->hw_features; | |
1da177e4 | 6375 | |
34324dc2 MM |
6376 | if (!(dev->flags & IFF_LOOPBACK)) { |
6377 | dev->hw_features |= NETIF_F_NOCACHE_COPY; | |
c6e1a0d1 TH |
6378 | } |
6379 | ||
1180e7d6 | 6380 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 6381 | */ |
1180e7d6 | 6382 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 6383 | |
ee579677 PS |
6384 | /* Make NETIF_F_SG inheritable to tunnel devices. |
6385 | */ | |
6386 | dev->hw_enc_features |= NETIF_F_SG; | |
6387 | ||
0d89d203 SH |
6388 | /* Make NETIF_F_SG inheritable to MPLS. |
6389 | */ | |
6390 | dev->mpls_features |= NETIF_F_SG; | |
6391 | ||
7ffbe3fd JB |
6392 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
6393 | ret = notifier_to_errno(ret); | |
6394 | if (ret) | |
6395 | goto err_uninit; | |
6396 | ||
8b41d188 | 6397 | ret = netdev_register_kobject(dev); |
b17a7c17 | 6398 | if (ret) |
7ce1b0ed | 6399 | goto err_uninit; |
b17a7c17 SH |
6400 | dev->reg_state = NETREG_REGISTERED; |
6401 | ||
6cb6a27c | 6402 | __netdev_update_features(dev); |
8e9b59b2 | 6403 | |
1da177e4 LT |
6404 | /* |
6405 | * Default initial state at registry is that the | |
6406 | * device is present. | |
6407 | */ | |
6408 | ||
6409 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
6410 | ||
8f4cccbb BH |
6411 | linkwatch_init_dev(dev); |
6412 | ||
1da177e4 | 6413 | dev_init_scheduler(dev); |
1da177e4 | 6414 | dev_hold(dev); |
ce286d32 | 6415 | list_netdevice(dev); |
7bf23575 | 6416 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 6417 | |
948b337e JP |
6418 | /* If the device has permanent device address, driver should |
6419 | * set dev_addr and also addr_assign_type should be set to | |
6420 | * NET_ADDR_PERM (default value). | |
6421 | */ | |
6422 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
6423 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
6424 | ||
1da177e4 | 6425 | /* Notify protocols, that a new device appeared. */ |
056925ab | 6426 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 6427 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
6428 | if (ret) { |
6429 | rollback_registered(dev); | |
6430 | dev->reg_state = NETREG_UNREGISTERED; | |
6431 | } | |
d90a909e EB |
6432 | /* |
6433 | * Prevent userspace races by waiting until the network | |
6434 | * device is fully setup before sending notifications. | |
6435 | */ | |
a2835763 PM |
6436 | if (!dev->rtnl_link_ops || |
6437 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 6438 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
6439 | |
6440 | out: | |
6441 | return ret; | |
7ce1b0ed HX |
6442 | |
6443 | err_uninit: | |
d314774c SH |
6444 | if (dev->netdev_ops->ndo_uninit) |
6445 | dev->netdev_ops->ndo_uninit(dev); | |
7ce1b0ed | 6446 | goto out; |
1da177e4 | 6447 | } |
d1b19dff | 6448 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 6449 | |
937f1ba5 BH |
6450 | /** |
6451 | * init_dummy_netdev - init a dummy network device for NAPI | |
6452 | * @dev: device to init | |
6453 | * | |
6454 | * This takes a network device structure and initialize the minimum | |
6455 | * amount of fields so it can be used to schedule NAPI polls without | |
6456 | * registering a full blown interface. This is to be used by drivers | |
6457 | * that need to tie several hardware interfaces to a single NAPI | |
6458 | * poll scheduler due to HW limitations. | |
6459 | */ | |
6460 | int init_dummy_netdev(struct net_device *dev) | |
6461 | { | |
6462 | /* Clear everything. Note we don't initialize spinlocks | |
6463 | * are they aren't supposed to be taken by any of the | |
6464 | * NAPI code and this dummy netdev is supposed to be | |
6465 | * only ever used for NAPI polls | |
6466 | */ | |
6467 | memset(dev, 0, sizeof(struct net_device)); | |
6468 | ||
6469 | /* make sure we BUG if trying to hit standard | |
6470 | * register/unregister code path | |
6471 | */ | |
6472 | dev->reg_state = NETREG_DUMMY; | |
6473 | ||
937f1ba5 BH |
6474 | /* NAPI wants this */ |
6475 | INIT_LIST_HEAD(&dev->napi_list); | |
6476 | ||
6477 | /* a dummy interface is started by default */ | |
6478 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
6479 | set_bit(__LINK_STATE_START, &dev->state); | |
6480 | ||
29b4433d ED |
6481 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
6482 | * because users of this 'device' dont need to change | |
6483 | * its refcount. | |
6484 | */ | |
6485 | ||
937f1ba5 BH |
6486 | return 0; |
6487 | } | |
6488 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
6489 | ||
6490 | ||
1da177e4 LT |
6491 | /** |
6492 | * register_netdev - register a network device | |
6493 | * @dev: device to register | |
6494 | * | |
6495 | * Take a completed network device structure and add it to the kernel | |
6496 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
6497 | * chain. 0 is returned on success. A negative errno code is returned | |
6498 | * on a failure to set up the device, or if the name is a duplicate. | |
6499 | * | |
38b4da38 | 6500 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
6501 | * and expands the device name if you passed a format string to |
6502 | * alloc_netdev. | |
6503 | */ | |
6504 | int register_netdev(struct net_device *dev) | |
6505 | { | |
6506 | int err; | |
6507 | ||
6508 | rtnl_lock(); | |
1da177e4 | 6509 | err = register_netdevice(dev); |
1da177e4 LT |
6510 | rtnl_unlock(); |
6511 | return err; | |
6512 | } | |
6513 | EXPORT_SYMBOL(register_netdev); | |
6514 | ||
29b4433d ED |
6515 | int netdev_refcnt_read(const struct net_device *dev) |
6516 | { | |
6517 | int i, refcnt = 0; | |
6518 | ||
6519 | for_each_possible_cpu(i) | |
6520 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
6521 | return refcnt; | |
6522 | } | |
6523 | EXPORT_SYMBOL(netdev_refcnt_read); | |
6524 | ||
2c53040f | 6525 | /** |
1da177e4 | 6526 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 6527 | * @dev: target net_device |
1da177e4 LT |
6528 | * |
6529 | * This is called when unregistering network devices. | |
6530 | * | |
6531 | * Any protocol or device that holds a reference should register | |
6532 | * for netdevice notification, and cleanup and put back the | |
6533 | * reference if they receive an UNREGISTER event. | |
6534 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 6535 | * call dev_put. |
1da177e4 LT |
6536 | */ |
6537 | static void netdev_wait_allrefs(struct net_device *dev) | |
6538 | { | |
6539 | unsigned long rebroadcast_time, warning_time; | |
29b4433d | 6540 | int refcnt; |
1da177e4 | 6541 | |
e014debe ED |
6542 | linkwatch_forget_dev(dev); |
6543 | ||
1da177e4 | 6544 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
6545 | refcnt = netdev_refcnt_read(dev); |
6546 | ||
6547 | while (refcnt != 0) { | |
1da177e4 | 6548 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 6549 | rtnl_lock(); |
1da177e4 LT |
6550 | |
6551 | /* Rebroadcast unregister notification */ | |
056925ab | 6552 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 6553 | |
748e2d93 | 6554 | __rtnl_unlock(); |
0115e8e3 | 6555 | rcu_barrier(); |
748e2d93 ED |
6556 | rtnl_lock(); |
6557 | ||
0115e8e3 | 6558 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
1da177e4 LT |
6559 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
6560 | &dev->state)) { | |
6561 | /* We must not have linkwatch events | |
6562 | * pending on unregister. If this | |
6563 | * happens, we simply run the queue | |
6564 | * unscheduled, resulting in a noop | |
6565 | * for this device. | |
6566 | */ | |
6567 | linkwatch_run_queue(); | |
6568 | } | |
6569 | ||
6756ae4b | 6570 | __rtnl_unlock(); |
1da177e4 LT |
6571 | |
6572 | rebroadcast_time = jiffies; | |
6573 | } | |
6574 | ||
6575 | msleep(250); | |
6576 | ||
29b4433d ED |
6577 | refcnt = netdev_refcnt_read(dev); |
6578 | ||
1da177e4 | 6579 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
7b6cd1ce JP |
6580 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
6581 | dev->name, refcnt); | |
1da177e4 LT |
6582 | warning_time = jiffies; |
6583 | } | |
6584 | } | |
6585 | } | |
6586 | ||
6587 | /* The sequence is: | |
6588 | * | |
6589 | * rtnl_lock(); | |
6590 | * ... | |
6591 | * register_netdevice(x1); | |
6592 | * register_netdevice(x2); | |
6593 | * ... | |
6594 | * unregister_netdevice(y1); | |
6595 | * unregister_netdevice(y2); | |
6596 | * ... | |
6597 | * rtnl_unlock(); | |
6598 | * free_netdev(y1); | |
6599 | * free_netdev(y2); | |
6600 | * | |
58ec3b4d | 6601 | * We are invoked by rtnl_unlock(). |
1da177e4 | 6602 | * This allows us to deal with problems: |
b17a7c17 | 6603 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
6604 | * without deadlocking with linkwatch via keventd. |
6605 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
6606 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
6607 | * |
6608 | * We must not return until all unregister events added during | |
6609 | * the interval the lock was held have been completed. | |
1da177e4 | 6610 | */ |
1da177e4 LT |
6611 | void netdev_run_todo(void) |
6612 | { | |
626ab0e6 | 6613 | struct list_head list; |
1da177e4 | 6614 | |
1da177e4 | 6615 | /* Snapshot list, allow later requests */ |
626ab0e6 | 6616 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
6617 | |
6618 | __rtnl_unlock(); | |
626ab0e6 | 6619 | |
0115e8e3 ED |
6620 | |
6621 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
6622 | if (!list_empty(&list)) |
6623 | rcu_barrier(); | |
6624 | ||
1da177e4 LT |
6625 | while (!list_empty(&list)) { |
6626 | struct net_device *dev | |
e5e26d75 | 6627 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
6628 | list_del(&dev->todo_list); |
6629 | ||
748e2d93 | 6630 | rtnl_lock(); |
0115e8e3 | 6631 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
748e2d93 | 6632 | __rtnl_unlock(); |
0115e8e3 | 6633 | |
b17a7c17 | 6634 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 6635 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
6636 | dev->name, dev->reg_state); |
6637 | dump_stack(); | |
6638 | continue; | |
6639 | } | |
1da177e4 | 6640 | |
b17a7c17 | 6641 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 6642 | |
152102c7 | 6643 | on_each_cpu(flush_backlog, dev, 1); |
6e583ce5 | 6644 | |
b17a7c17 | 6645 | netdev_wait_allrefs(dev); |
1da177e4 | 6646 | |
b17a7c17 | 6647 | /* paranoia */ |
29b4433d | 6648 | BUG_ON(netdev_refcnt_read(dev)); |
7866a621 SN |
6649 | BUG_ON(!list_empty(&dev->ptype_all)); |
6650 | BUG_ON(!list_empty(&dev->ptype_specific)); | |
33d480ce ED |
6651 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
6652 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
547b792c | 6653 | WARN_ON(dev->dn_ptr); |
1da177e4 | 6654 | |
b17a7c17 SH |
6655 | if (dev->destructor) |
6656 | dev->destructor(dev); | |
9093bbb2 | 6657 | |
50624c93 EB |
6658 | /* Report a network device has been unregistered */ |
6659 | rtnl_lock(); | |
6660 | dev_net(dev)->dev_unreg_count--; | |
6661 | __rtnl_unlock(); | |
6662 | wake_up(&netdev_unregistering_wq); | |
6663 | ||
9093bbb2 SH |
6664 | /* Free network device */ |
6665 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 6666 | } |
1da177e4 LT |
6667 | } |
6668 | ||
3cfde79c BH |
6669 | /* Convert net_device_stats to rtnl_link_stats64. They have the same |
6670 | * fields in the same order, with only the type differing. | |
6671 | */ | |
77a1abf5 ED |
6672 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
6673 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
6674 | { |
6675 | #if BITS_PER_LONG == 64 | |
77a1abf5 ED |
6676 | BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats)); |
6677 | memcpy(stats64, netdev_stats, sizeof(*stats64)); | |
3cfde79c BH |
6678 | #else |
6679 | size_t i, n = sizeof(*stats64) / sizeof(u64); | |
6680 | const unsigned long *src = (const unsigned long *)netdev_stats; | |
6681 | u64 *dst = (u64 *)stats64; | |
6682 | ||
6683 | BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) != | |
6684 | sizeof(*stats64) / sizeof(u64)); | |
6685 | for (i = 0; i < n; i++) | |
6686 | dst[i] = src[i]; | |
6687 | #endif | |
6688 | } | |
77a1abf5 | 6689 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 6690 | |
eeda3fd6 SH |
6691 | /** |
6692 | * dev_get_stats - get network device statistics | |
6693 | * @dev: device to get statistics from | |
28172739 | 6694 | * @storage: place to store stats |
eeda3fd6 | 6695 | * |
d7753516 BH |
6696 | * Get network statistics from device. Return @storage. |
6697 | * The device driver may provide its own method by setting | |
6698 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
6699 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 6700 | */ |
d7753516 BH |
6701 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
6702 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 6703 | { |
eeda3fd6 SH |
6704 | const struct net_device_ops *ops = dev->netdev_ops; |
6705 | ||
28172739 ED |
6706 | if (ops->ndo_get_stats64) { |
6707 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
6708 | ops->ndo_get_stats64(dev, storage); |
6709 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 6710 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
6711 | } else { |
6712 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 6713 | } |
caf586e5 | 6714 | storage->rx_dropped += atomic_long_read(&dev->rx_dropped); |
015f0688 | 6715 | storage->tx_dropped += atomic_long_read(&dev->tx_dropped); |
28172739 | 6716 | return storage; |
c45d286e | 6717 | } |
eeda3fd6 | 6718 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 6719 | |
24824a09 | 6720 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 6721 | { |
24824a09 | 6722 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 6723 | |
24824a09 ED |
6724 | #ifdef CONFIG_NET_CLS_ACT |
6725 | if (queue) | |
6726 | return queue; | |
6727 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
6728 | if (!queue) | |
6729 | return NULL; | |
6730 | netdev_init_one_queue(dev, queue, NULL); | |
2ce1ee17 | 6731 | RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); |
24824a09 ED |
6732 | queue->qdisc_sleeping = &noop_qdisc; |
6733 | rcu_assign_pointer(dev->ingress_queue, queue); | |
6734 | #endif | |
6735 | return queue; | |
bb949fbd DM |
6736 | } |
6737 | ||
2c60db03 ED |
6738 | static const struct ethtool_ops default_ethtool_ops; |
6739 | ||
d07d7507 SG |
6740 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
6741 | const struct ethtool_ops *ops) | |
6742 | { | |
6743 | if (dev->ethtool_ops == &default_ethtool_ops) | |
6744 | dev->ethtool_ops = ops; | |
6745 | } | |
6746 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
6747 | ||
74d332c1 ED |
6748 | void netdev_freemem(struct net_device *dev) |
6749 | { | |
6750 | char *addr = (char *)dev - dev->padded; | |
6751 | ||
4cb28970 | 6752 | kvfree(addr); |
74d332c1 ED |
6753 | } |
6754 | ||
1da177e4 | 6755 | /** |
36909ea4 | 6756 | * alloc_netdev_mqs - allocate network device |
c835a677 TG |
6757 | * @sizeof_priv: size of private data to allocate space for |
6758 | * @name: device name format string | |
6759 | * @name_assign_type: origin of device name | |
6760 | * @setup: callback to initialize device | |
6761 | * @txqs: the number of TX subqueues to allocate | |
6762 | * @rxqs: the number of RX subqueues to allocate | |
1da177e4 LT |
6763 | * |
6764 | * Allocates a struct net_device with private data area for driver use | |
90e51adf | 6765 | * and performs basic initialization. Also allocates subqueue structs |
36909ea4 | 6766 | * for each queue on the device. |
1da177e4 | 6767 | */ |
36909ea4 | 6768 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
c835a677 | 6769 | unsigned char name_assign_type, |
36909ea4 TH |
6770 | void (*setup)(struct net_device *), |
6771 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 6772 | { |
1da177e4 | 6773 | struct net_device *dev; |
7943986c | 6774 | size_t alloc_size; |
1ce8e7b5 | 6775 | struct net_device *p; |
1da177e4 | 6776 | |
b6fe17d6 SH |
6777 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
6778 | ||
36909ea4 | 6779 | if (txqs < 1) { |
7b6cd1ce | 6780 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
6781 | return NULL; |
6782 | } | |
6783 | ||
a953be53 | 6784 | #ifdef CONFIG_SYSFS |
36909ea4 | 6785 | if (rxqs < 1) { |
7b6cd1ce | 6786 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
6787 | return NULL; |
6788 | } | |
6789 | #endif | |
6790 | ||
fd2ea0a7 | 6791 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
6792 | if (sizeof_priv) { |
6793 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 6794 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
6795 | alloc_size += sizeof_priv; |
6796 | } | |
6797 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 6798 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 6799 | |
74d332c1 ED |
6800 | p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
6801 | if (!p) | |
6802 | p = vzalloc(alloc_size); | |
62b5942a | 6803 | if (!p) |
1da177e4 | 6804 | return NULL; |
1da177e4 | 6805 | |
1ce8e7b5 | 6806 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 6807 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 6808 | |
29b4433d ED |
6809 | dev->pcpu_refcnt = alloc_percpu(int); |
6810 | if (!dev->pcpu_refcnt) | |
74d332c1 | 6811 | goto free_dev; |
ab9c73cc | 6812 | |
ab9c73cc | 6813 | if (dev_addr_init(dev)) |
29b4433d | 6814 | goto free_pcpu; |
ab9c73cc | 6815 | |
22bedad3 | 6816 | dev_mc_init(dev); |
a748ee24 | 6817 | dev_uc_init(dev); |
ccffad25 | 6818 | |
c346dca1 | 6819 | dev_net_set(dev, &init_net); |
1da177e4 | 6820 | |
8d3bdbd5 | 6821 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 6822 | dev->gso_max_segs = GSO_MAX_SEGS; |
fcbeb976 | 6823 | dev->gso_min_segs = 0; |
8d3bdbd5 | 6824 | |
8d3bdbd5 DM |
6825 | INIT_LIST_HEAD(&dev->napi_list); |
6826 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 6827 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 6828 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
6829 | INIT_LIST_HEAD(&dev->adj_list.upper); |
6830 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
6831 | INIT_LIST_HEAD(&dev->all_adj_list.upper); | |
6832 | INIT_LIST_HEAD(&dev->all_adj_list.lower); | |
7866a621 SN |
6833 | INIT_LIST_HEAD(&dev->ptype_all); |
6834 | INIT_LIST_HEAD(&dev->ptype_specific); | |
02875878 | 6835 | dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
8d3bdbd5 DM |
6836 | setup(dev); |
6837 | ||
36909ea4 TH |
6838 | dev->num_tx_queues = txqs; |
6839 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 6840 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 6841 | goto free_all; |
e8a0464c | 6842 | |
a953be53 | 6843 | #ifdef CONFIG_SYSFS |
36909ea4 TH |
6844 | dev->num_rx_queues = rxqs; |
6845 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 6846 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 6847 | goto free_all; |
df334545 | 6848 | #endif |
0a9627f2 | 6849 | |
1da177e4 | 6850 | strcpy(dev->name, name); |
c835a677 | 6851 | dev->name_assign_type = name_assign_type; |
cbda10fa | 6852 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
6853 | if (!dev->ethtool_ops) |
6854 | dev->ethtool_ops = &default_ethtool_ops; | |
1da177e4 | 6855 | return dev; |
ab9c73cc | 6856 | |
8d3bdbd5 DM |
6857 | free_all: |
6858 | free_netdev(dev); | |
6859 | return NULL; | |
6860 | ||
29b4433d ED |
6861 | free_pcpu: |
6862 | free_percpu(dev->pcpu_refcnt); | |
74d332c1 ED |
6863 | free_dev: |
6864 | netdev_freemem(dev); | |
ab9c73cc | 6865 | return NULL; |
1da177e4 | 6866 | } |
36909ea4 | 6867 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
6868 | |
6869 | /** | |
6870 | * free_netdev - free network device | |
6871 | * @dev: device | |
6872 | * | |
4ec93edb YH |
6873 | * This function does the last stage of destroying an allocated device |
6874 | * interface. The reference to the device object is released. | |
1da177e4 LT |
6875 | * If this is the last reference then it will be freed. |
6876 | */ | |
6877 | void free_netdev(struct net_device *dev) | |
6878 | { | |
d565b0a1 HX |
6879 | struct napi_struct *p, *n; |
6880 | ||
60877a32 | 6881 | netif_free_tx_queues(dev); |
a953be53 | 6882 | #ifdef CONFIG_SYSFS |
10595902 | 6883 | kvfree(dev->_rx); |
fe822240 | 6884 | #endif |
e8a0464c | 6885 | |
33d480ce | 6886 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 6887 | |
f001fde5 JP |
6888 | /* Flush device addresses */ |
6889 | dev_addr_flush(dev); | |
6890 | ||
d565b0a1 HX |
6891 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
6892 | netif_napi_del(p); | |
6893 | ||
29b4433d ED |
6894 | free_percpu(dev->pcpu_refcnt); |
6895 | dev->pcpu_refcnt = NULL; | |
6896 | ||
3041a069 | 6897 | /* Compatibility with error handling in drivers */ |
1da177e4 | 6898 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 6899 | netdev_freemem(dev); |
1da177e4 LT |
6900 | return; |
6901 | } | |
6902 | ||
6903 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
6904 | dev->reg_state = NETREG_RELEASED; | |
6905 | ||
43cb76d9 GKH |
6906 | /* will free via device release */ |
6907 | put_device(&dev->dev); | |
1da177e4 | 6908 | } |
d1b19dff | 6909 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 6910 | |
f0db275a SH |
6911 | /** |
6912 | * synchronize_net - Synchronize with packet receive processing | |
6913 | * | |
6914 | * Wait for packets currently being received to be done. | |
6915 | * Does not block later packets from starting. | |
6916 | */ | |
4ec93edb | 6917 | void synchronize_net(void) |
1da177e4 LT |
6918 | { |
6919 | might_sleep(); | |
be3fc413 ED |
6920 | if (rtnl_is_locked()) |
6921 | synchronize_rcu_expedited(); | |
6922 | else | |
6923 | synchronize_rcu(); | |
1da177e4 | 6924 | } |
d1b19dff | 6925 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
6926 | |
6927 | /** | |
44a0873d | 6928 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 6929 | * @dev: device |
44a0873d | 6930 | * @head: list |
6ebfbc06 | 6931 | * |
1da177e4 | 6932 | * This function shuts down a device interface and removes it |
d59b54b1 | 6933 | * from the kernel tables. |
44a0873d | 6934 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
6935 | * |
6936 | * Callers must hold the rtnl semaphore. You may want | |
6937 | * unregister_netdev() instead of this. | |
6938 | */ | |
6939 | ||
44a0873d | 6940 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 6941 | { |
a6620712 HX |
6942 | ASSERT_RTNL(); |
6943 | ||
44a0873d | 6944 | if (head) { |
9fdce099 | 6945 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
6946 | } else { |
6947 | rollback_registered(dev); | |
6948 | /* Finish processing unregister after unlock */ | |
6949 | net_set_todo(dev); | |
6950 | } | |
1da177e4 | 6951 | } |
44a0873d | 6952 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 6953 | |
9b5e383c ED |
6954 | /** |
6955 | * unregister_netdevice_many - unregister many devices | |
6956 | * @head: list of devices | |
87757a91 ED |
6957 | * |
6958 | * Note: As most callers use a stack allocated list_head, | |
6959 | * we force a list_del() to make sure stack wont be corrupted later. | |
9b5e383c ED |
6960 | */ |
6961 | void unregister_netdevice_many(struct list_head *head) | |
6962 | { | |
6963 | struct net_device *dev; | |
6964 | ||
6965 | if (!list_empty(head)) { | |
6966 | rollback_registered_many(head); | |
6967 | list_for_each_entry(dev, head, unreg_list) | |
6968 | net_set_todo(dev); | |
87757a91 | 6969 | list_del(head); |
9b5e383c ED |
6970 | } |
6971 | } | |
63c8099d | 6972 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 6973 | |
1da177e4 LT |
6974 | /** |
6975 | * unregister_netdev - remove device from the kernel | |
6976 | * @dev: device | |
6977 | * | |
6978 | * This function shuts down a device interface and removes it | |
d59b54b1 | 6979 | * from the kernel tables. |
1da177e4 LT |
6980 | * |
6981 | * This is just a wrapper for unregister_netdevice that takes | |
6982 | * the rtnl semaphore. In general you want to use this and not | |
6983 | * unregister_netdevice. | |
6984 | */ | |
6985 | void unregister_netdev(struct net_device *dev) | |
6986 | { | |
6987 | rtnl_lock(); | |
6988 | unregister_netdevice(dev); | |
6989 | rtnl_unlock(); | |
6990 | } | |
1da177e4 LT |
6991 | EXPORT_SYMBOL(unregister_netdev); |
6992 | ||
ce286d32 EB |
6993 | /** |
6994 | * dev_change_net_namespace - move device to different nethost namespace | |
6995 | * @dev: device | |
6996 | * @net: network namespace | |
6997 | * @pat: If not NULL name pattern to try if the current device name | |
6998 | * is already taken in the destination network namespace. | |
6999 | * | |
7000 | * This function shuts down a device interface and moves it | |
7001 | * to a new network namespace. On success 0 is returned, on | |
7002 | * a failure a netagive errno code is returned. | |
7003 | * | |
7004 | * Callers must hold the rtnl semaphore. | |
7005 | */ | |
7006 | ||
7007 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
7008 | { | |
ce286d32 EB |
7009 | int err; |
7010 | ||
7011 | ASSERT_RTNL(); | |
7012 | ||
7013 | /* Don't allow namespace local devices to be moved. */ | |
7014 | err = -EINVAL; | |
7015 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
7016 | goto out; | |
7017 | ||
7018 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
7019 | if (dev->reg_state != NETREG_REGISTERED) |
7020 | goto out; | |
7021 | ||
7022 | /* Get out if there is nothing todo */ | |
7023 | err = 0; | |
878628fb | 7024 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
7025 | goto out; |
7026 | ||
7027 | /* Pick the destination device name, and ensure | |
7028 | * we can use it in the destination network namespace. | |
7029 | */ | |
7030 | err = -EEXIST; | |
d9031024 | 7031 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
7032 | /* We get here if we can't use the current device name */ |
7033 | if (!pat) | |
7034 | goto out; | |
828de4f6 | 7035 | if (dev_get_valid_name(net, dev, pat) < 0) |
ce286d32 EB |
7036 | goto out; |
7037 | } | |
7038 | ||
7039 | /* | |
7040 | * And now a mini version of register_netdevice unregister_netdevice. | |
7041 | */ | |
7042 | ||
7043 | /* If device is running close it first. */ | |
9b772652 | 7044 | dev_close(dev); |
ce286d32 EB |
7045 | |
7046 | /* And unlink it from device chain */ | |
7047 | err = -ENODEV; | |
7048 | unlist_netdevice(dev); | |
7049 | ||
7050 | synchronize_net(); | |
7051 | ||
7052 | /* Shutdown queueing discipline. */ | |
7053 | dev_shutdown(dev); | |
7054 | ||
7055 | /* Notify protocols, that we are about to destroy | |
7056 | this device. They should clean all the things. | |
3b27e105 DL |
7057 | |
7058 | Note that dev->reg_state stays at NETREG_REGISTERED. | |
7059 | This is wanted because this way 8021q and macvlan know | |
7060 | the device is just moving and can keep their slaves up. | |
ce286d32 EB |
7061 | */ |
7062 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
6549dd43 G |
7063 | rcu_barrier(); |
7064 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); | |
7f294054 | 7065 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); |
ce286d32 EB |
7066 | |
7067 | /* | |
7068 | * Flush the unicast and multicast chains | |
7069 | */ | |
a748ee24 | 7070 | dev_uc_flush(dev); |
22bedad3 | 7071 | dev_mc_flush(dev); |
ce286d32 | 7072 | |
4e66ae2e SH |
7073 | /* Send a netdev-removed uevent to the old namespace */ |
7074 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
4c75431a | 7075 | netdev_adjacent_del_links(dev); |
4e66ae2e | 7076 | |
ce286d32 | 7077 | /* Actually switch the network namespace */ |
c346dca1 | 7078 | dev_net_set(dev, net); |
ce286d32 | 7079 | |
ce286d32 | 7080 | /* If there is an ifindex conflict assign a new one */ |
7a66bbc9 | 7081 | if (__dev_get_by_index(net, dev->ifindex)) |
ce286d32 | 7082 | dev->ifindex = dev_new_index(net); |
ce286d32 | 7083 | |
4e66ae2e SH |
7084 | /* Send a netdev-add uevent to the new namespace */ |
7085 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
4c75431a | 7086 | netdev_adjacent_add_links(dev); |
4e66ae2e | 7087 | |
8b41d188 | 7088 | /* Fixup kobjects */ |
a1b3f594 | 7089 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 7090 | WARN_ON(err); |
ce286d32 EB |
7091 | |
7092 | /* Add the device back in the hashes */ | |
7093 | list_netdevice(dev); | |
7094 | ||
7095 | /* Notify protocols, that a new device appeared. */ | |
7096 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
7097 | ||
d90a909e EB |
7098 | /* |
7099 | * Prevent userspace races by waiting until the network | |
7100 | * device is fully setup before sending notifications. | |
7101 | */ | |
7f294054 | 7102 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 7103 | |
ce286d32 EB |
7104 | synchronize_net(); |
7105 | err = 0; | |
7106 | out: | |
7107 | return err; | |
7108 | } | |
463d0183 | 7109 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 7110 | |
1da177e4 LT |
7111 | static int dev_cpu_callback(struct notifier_block *nfb, |
7112 | unsigned long action, | |
7113 | void *ocpu) | |
7114 | { | |
7115 | struct sk_buff **list_skb; | |
1da177e4 LT |
7116 | struct sk_buff *skb; |
7117 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
7118 | struct softnet_data *sd, *oldsd; | |
7119 | ||
8bb78442 | 7120 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
7121 | return NOTIFY_OK; |
7122 | ||
7123 | local_irq_disable(); | |
7124 | cpu = smp_processor_id(); | |
7125 | sd = &per_cpu(softnet_data, cpu); | |
7126 | oldsd = &per_cpu(softnet_data, oldcpu); | |
7127 | ||
7128 | /* Find end of our completion_queue. */ | |
7129 | list_skb = &sd->completion_queue; | |
7130 | while (*list_skb) | |
7131 | list_skb = &(*list_skb)->next; | |
7132 | /* Append completion queue from offline CPU. */ | |
7133 | *list_skb = oldsd->completion_queue; | |
7134 | oldsd->completion_queue = NULL; | |
7135 | ||
1da177e4 | 7136 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
7137 | if (oldsd->output_queue) { |
7138 | *sd->output_queue_tailp = oldsd->output_queue; | |
7139 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
7140 | oldsd->output_queue = NULL; | |
7141 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
7142 | } | |
ac64da0b ED |
7143 | /* Append NAPI poll list from offline CPU, with one exception : |
7144 | * process_backlog() must be called by cpu owning percpu backlog. | |
7145 | * We properly handle process_queue & input_pkt_queue later. | |
7146 | */ | |
7147 | while (!list_empty(&oldsd->poll_list)) { | |
7148 | struct napi_struct *napi = list_first_entry(&oldsd->poll_list, | |
7149 | struct napi_struct, | |
7150 | poll_list); | |
7151 | ||
7152 | list_del_init(&napi->poll_list); | |
7153 | if (napi->poll == process_backlog) | |
7154 | napi->state = 0; | |
7155 | else | |
7156 | ____napi_schedule(sd, napi); | |
264524d5 | 7157 | } |
1da177e4 LT |
7158 | |
7159 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
7160 | local_irq_enable(); | |
7161 | ||
7162 | /* Process offline CPU's input_pkt_queue */ | |
76cc8b13 | 7163 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
91e83133 | 7164 | netif_rx_ni(skb); |
76cc8b13 | 7165 | input_queue_head_incr(oldsd); |
fec5e652 | 7166 | } |
ac64da0b | 7167 | while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { |
91e83133 | 7168 | netif_rx_ni(skb); |
76cc8b13 TH |
7169 | input_queue_head_incr(oldsd); |
7170 | } | |
1da177e4 LT |
7171 | |
7172 | return NOTIFY_OK; | |
7173 | } | |
1da177e4 LT |
7174 | |
7175 | ||
7f353bf2 | 7176 | /** |
b63365a2 HX |
7177 | * netdev_increment_features - increment feature set by one |
7178 | * @all: current feature set | |
7179 | * @one: new feature set | |
7180 | * @mask: mask feature set | |
7f353bf2 HX |
7181 | * |
7182 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
7183 | * @one to the master device with current feature set @all. Will not |
7184 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 7185 | */ |
c8f44aff MM |
7186 | netdev_features_t netdev_increment_features(netdev_features_t all, |
7187 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 7188 | { |
1742f183 MM |
7189 | if (mask & NETIF_F_GEN_CSUM) |
7190 | mask |= NETIF_F_ALL_CSUM; | |
7191 | mask |= NETIF_F_VLAN_CHALLENGED; | |
7f353bf2 | 7192 | |
1742f183 MM |
7193 | all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask; |
7194 | all &= one | ~NETIF_F_ALL_FOR_ALL; | |
c6e1a0d1 | 7195 | |
1742f183 MM |
7196 | /* If one device supports hw checksumming, set for all. */ |
7197 | if (all & NETIF_F_GEN_CSUM) | |
7198 | all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM); | |
7f353bf2 HX |
7199 | |
7200 | return all; | |
7201 | } | |
b63365a2 | 7202 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 7203 | |
430f03cd | 7204 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
7205 | { |
7206 | int i; | |
7207 | struct hlist_head *hash; | |
7208 | ||
7209 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); | |
7210 | if (hash != NULL) | |
7211 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
7212 | INIT_HLIST_HEAD(&hash[i]); | |
7213 | ||
7214 | return hash; | |
7215 | } | |
7216 | ||
881d966b | 7217 | /* Initialize per network namespace state */ |
4665079c | 7218 | static int __net_init netdev_init(struct net *net) |
881d966b | 7219 | { |
734b6541 RM |
7220 | if (net != &init_net) |
7221 | INIT_LIST_HEAD(&net->dev_base_head); | |
881d966b | 7222 | |
30d97d35 PE |
7223 | net->dev_name_head = netdev_create_hash(); |
7224 | if (net->dev_name_head == NULL) | |
7225 | goto err_name; | |
881d966b | 7226 | |
30d97d35 PE |
7227 | net->dev_index_head = netdev_create_hash(); |
7228 | if (net->dev_index_head == NULL) | |
7229 | goto err_idx; | |
881d966b EB |
7230 | |
7231 | return 0; | |
30d97d35 PE |
7232 | |
7233 | err_idx: | |
7234 | kfree(net->dev_name_head); | |
7235 | err_name: | |
7236 | return -ENOMEM; | |
881d966b EB |
7237 | } |
7238 | ||
f0db275a SH |
7239 | /** |
7240 | * netdev_drivername - network driver for the device | |
7241 | * @dev: network device | |
f0db275a SH |
7242 | * |
7243 | * Determine network driver for device. | |
7244 | */ | |
3019de12 | 7245 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 7246 | { |
cf04a4c7 SH |
7247 | const struct device_driver *driver; |
7248 | const struct device *parent; | |
3019de12 | 7249 | const char *empty = ""; |
6579e57b AV |
7250 | |
7251 | parent = dev->dev.parent; | |
6579e57b | 7252 | if (!parent) |
3019de12 | 7253 | return empty; |
6579e57b AV |
7254 | |
7255 | driver = parent->driver; | |
7256 | if (driver && driver->name) | |
3019de12 DM |
7257 | return driver->name; |
7258 | return empty; | |
6579e57b AV |
7259 | } |
7260 | ||
6ea754eb JP |
7261 | static void __netdev_printk(const char *level, const struct net_device *dev, |
7262 | struct va_format *vaf) | |
256df2f3 | 7263 | { |
b004ff49 | 7264 | if (dev && dev->dev.parent) { |
6ea754eb JP |
7265 | dev_printk_emit(level[1] - '0', |
7266 | dev->dev.parent, | |
7267 | "%s %s %s%s: %pV", | |
7268 | dev_driver_string(dev->dev.parent), | |
7269 | dev_name(dev->dev.parent), | |
7270 | netdev_name(dev), netdev_reg_state(dev), | |
7271 | vaf); | |
b004ff49 | 7272 | } else if (dev) { |
6ea754eb JP |
7273 | printk("%s%s%s: %pV", |
7274 | level, netdev_name(dev), netdev_reg_state(dev), vaf); | |
b004ff49 | 7275 | } else { |
6ea754eb | 7276 | printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 7277 | } |
256df2f3 JP |
7278 | } |
7279 | ||
6ea754eb JP |
7280 | void netdev_printk(const char *level, const struct net_device *dev, |
7281 | const char *format, ...) | |
256df2f3 JP |
7282 | { |
7283 | struct va_format vaf; | |
7284 | va_list args; | |
256df2f3 JP |
7285 | |
7286 | va_start(args, format); | |
7287 | ||
7288 | vaf.fmt = format; | |
7289 | vaf.va = &args; | |
7290 | ||
6ea754eb | 7291 | __netdev_printk(level, dev, &vaf); |
b004ff49 | 7292 | |
256df2f3 | 7293 | va_end(args); |
256df2f3 JP |
7294 | } |
7295 | EXPORT_SYMBOL(netdev_printk); | |
7296 | ||
7297 | #define define_netdev_printk_level(func, level) \ | |
6ea754eb | 7298 | void func(const struct net_device *dev, const char *fmt, ...) \ |
256df2f3 | 7299 | { \ |
256df2f3 JP |
7300 | struct va_format vaf; \ |
7301 | va_list args; \ | |
7302 | \ | |
7303 | va_start(args, fmt); \ | |
7304 | \ | |
7305 | vaf.fmt = fmt; \ | |
7306 | vaf.va = &args; \ | |
7307 | \ | |
6ea754eb | 7308 | __netdev_printk(level, dev, &vaf); \ |
b004ff49 | 7309 | \ |
256df2f3 | 7310 | va_end(args); \ |
256df2f3 JP |
7311 | } \ |
7312 | EXPORT_SYMBOL(func); | |
7313 | ||
7314 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
7315 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
7316 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
7317 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
7318 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
7319 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
7320 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
7321 | ||
4665079c | 7322 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
7323 | { |
7324 | kfree(net->dev_name_head); | |
7325 | kfree(net->dev_index_head); | |
7326 | } | |
7327 | ||
022cbae6 | 7328 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
7329 | .init = netdev_init, |
7330 | .exit = netdev_exit, | |
7331 | }; | |
7332 | ||
4665079c | 7333 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 7334 | { |
e008b5fc | 7335 | struct net_device *dev, *aux; |
ce286d32 | 7336 | /* |
e008b5fc | 7337 | * Push all migratable network devices back to the |
ce286d32 EB |
7338 | * initial network namespace |
7339 | */ | |
7340 | rtnl_lock(); | |
e008b5fc | 7341 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 7342 | int err; |
aca51397 | 7343 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
7344 | |
7345 | /* Ignore unmoveable devices (i.e. loopback) */ | |
7346 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
7347 | continue; | |
7348 | ||
e008b5fc EB |
7349 | /* Leave virtual devices for the generic cleanup */ |
7350 | if (dev->rtnl_link_ops) | |
7351 | continue; | |
d0c082ce | 7352 | |
25985edc | 7353 | /* Push remaining network devices to init_net */ |
aca51397 PE |
7354 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
7355 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 7356 | if (err) { |
7b6cd1ce JP |
7357 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
7358 | __func__, dev->name, err); | |
aca51397 | 7359 | BUG(); |
ce286d32 EB |
7360 | } |
7361 | } | |
7362 | rtnl_unlock(); | |
7363 | } | |
7364 | ||
50624c93 EB |
7365 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
7366 | { | |
7367 | /* Return with the rtnl_lock held when there are no network | |
7368 | * devices unregistering in any network namespace in net_list. | |
7369 | */ | |
7370 | struct net *net; | |
7371 | bool unregistering; | |
ff960a73 | 7372 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
50624c93 | 7373 | |
ff960a73 | 7374 | add_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 | 7375 | for (;;) { |
50624c93 EB |
7376 | unregistering = false; |
7377 | rtnl_lock(); | |
7378 | list_for_each_entry(net, net_list, exit_list) { | |
7379 | if (net->dev_unreg_count > 0) { | |
7380 | unregistering = true; | |
7381 | break; | |
7382 | } | |
7383 | } | |
7384 | if (!unregistering) | |
7385 | break; | |
7386 | __rtnl_unlock(); | |
ff960a73 PZ |
7387 | |
7388 | wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
50624c93 | 7389 | } |
ff960a73 | 7390 | remove_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 EB |
7391 | } |
7392 | ||
04dc7f6b EB |
7393 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
7394 | { | |
7395 | /* At exit all network devices most be removed from a network | |
b595076a | 7396 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
7397 | * Do this across as many network namespaces as possible to |
7398 | * improve batching efficiency. | |
7399 | */ | |
7400 | struct net_device *dev; | |
7401 | struct net *net; | |
7402 | LIST_HEAD(dev_kill_list); | |
7403 | ||
50624c93 EB |
7404 | /* To prevent network device cleanup code from dereferencing |
7405 | * loopback devices or network devices that have been freed | |
7406 | * wait here for all pending unregistrations to complete, | |
7407 | * before unregistring the loopback device and allowing the | |
7408 | * network namespace be freed. | |
7409 | * | |
7410 | * The netdev todo list containing all network devices | |
7411 | * unregistrations that happen in default_device_exit_batch | |
7412 | * will run in the rtnl_unlock() at the end of | |
7413 | * default_device_exit_batch. | |
7414 | */ | |
7415 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
7416 | list_for_each_entry(net, net_list, exit_list) { |
7417 | for_each_netdev_reverse(net, dev) { | |
b0ab2fab | 7418 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
04dc7f6b EB |
7419 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
7420 | else | |
7421 | unregister_netdevice_queue(dev, &dev_kill_list); | |
7422 | } | |
7423 | } | |
7424 | unregister_netdevice_many(&dev_kill_list); | |
7425 | rtnl_unlock(); | |
7426 | } | |
7427 | ||
022cbae6 | 7428 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 7429 | .exit = default_device_exit, |
04dc7f6b | 7430 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
7431 | }; |
7432 | ||
1da177e4 LT |
7433 | /* |
7434 | * Initialize the DEV module. At boot time this walks the device list and | |
7435 | * unhooks any devices that fail to initialise (normally hardware not | |
7436 | * present) and leaves us with a valid list of present and active devices. | |
7437 | * | |
7438 | */ | |
7439 | ||
7440 | /* | |
7441 | * This is called single threaded during boot, so no need | |
7442 | * to take the rtnl semaphore. | |
7443 | */ | |
7444 | static int __init net_dev_init(void) | |
7445 | { | |
7446 | int i, rc = -ENOMEM; | |
7447 | ||
7448 | BUG_ON(!dev_boot_phase); | |
7449 | ||
1da177e4 LT |
7450 | if (dev_proc_init()) |
7451 | goto out; | |
7452 | ||
8b41d188 | 7453 | if (netdev_kobject_init()) |
1da177e4 LT |
7454 | goto out; |
7455 | ||
7456 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 7457 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
7458 | INIT_LIST_HEAD(&ptype_base[i]); |
7459 | ||
62532da9 VY |
7460 | INIT_LIST_HEAD(&offload_base); |
7461 | ||
881d966b EB |
7462 | if (register_pernet_subsys(&netdev_net_ops)) |
7463 | goto out; | |
1da177e4 LT |
7464 | |
7465 | /* | |
7466 | * Initialise the packet receive queues. | |
7467 | */ | |
7468 | ||
6f912042 | 7469 | for_each_possible_cpu(i) { |
e36fa2f7 | 7470 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 7471 | |
e36fa2f7 | 7472 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 7473 | skb_queue_head_init(&sd->process_queue); |
e36fa2f7 | 7474 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 7475 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 7476 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
7477 | sd->csd.func = rps_trigger_softirq; |
7478 | sd->csd.info = sd; | |
e36fa2f7 | 7479 | sd->cpu = i; |
1e94d72f | 7480 | #endif |
0a9627f2 | 7481 | |
e36fa2f7 ED |
7482 | sd->backlog.poll = process_backlog; |
7483 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
7484 | } |
7485 | ||
1da177e4 LT |
7486 | dev_boot_phase = 0; |
7487 | ||
505d4f73 EB |
7488 | /* The loopback device is special if any other network devices |
7489 | * is present in a network namespace the loopback device must | |
7490 | * be present. Since we now dynamically allocate and free the | |
7491 | * loopback device ensure this invariant is maintained by | |
7492 | * keeping the loopback device as the first device on the | |
7493 | * list of network devices. Ensuring the loopback devices | |
7494 | * is the first device that appears and the last network device | |
7495 | * that disappears. | |
7496 | */ | |
7497 | if (register_pernet_device(&loopback_net_ops)) | |
7498 | goto out; | |
7499 | ||
7500 | if (register_pernet_device(&default_device_ops)) | |
7501 | goto out; | |
7502 | ||
962cf36c CM |
7503 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
7504 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 LT |
7505 | |
7506 | hotcpu_notifier(dev_cpu_callback, 0); | |
7507 | dst_init(); | |
1da177e4 LT |
7508 | rc = 0; |
7509 | out: | |
7510 | return rc; | |
7511 | } | |
7512 | ||
7513 | subsys_initcall(net_dev_init); |