Commit | Line | Data |
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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> |
8f0f2223 DM |
121 | #include <linux/ipv6.h> |
122 | #include <linux/in.h> | |
b6b2fed1 DM |
123 | #include <linux/jhash.h> |
124 | #include <linux/random.h> | |
9cbc1cb8 | 125 | #include <trace/events/napi.h> |
cf66ba58 | 126 | #include <trace/events/net.h> |
07dc22e7 | 127 | #include <trace/events/skb.h> |
5acbbd42 | 128 | #include <linux/pci.h> |
caeda9b9 | 129 | #include <linux/inetdevice.h> |
c445477d | 130 | #include <linux/cpu_rmap.h> |
c5905afb | 131 | #include <linux/static_key.h> |
af12fa6e | 132 | #include <linux/hashtable.h> |
60877a32 | 133 | #include <linux/vmalloc.h> |
529d0489 | 134 | #include <linux/if_macvlan.h> |
1da177e4 | 135 | |
342709ef PE |
136 | #include "net-sysfs.h" |
137 | ||
d565b0a1 HX |
138 | /* Instead of increasing this, you should create a hash table. */ |
139 | #define MAX_GRO_SKBS 8 | |
140 | ||
5d38a079 HX |
141 | /* This should be increased if a protocol with a bigger head is added. */ |
142 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
143 | ||
1da177e4 | 144 | static DEFINE_SPINLOCK(ptype_lock); |
62532da9 | 145 | static DEFINE_SPINLOCK(offload_lock); |
900ff8c6 CW |
146 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
147 | struct list_head ptype_all __read_mostly; /* Taps */ | |
62532da9 | 148 | static struct list_head offload_base __read_mostly; |
1da177e4 | 149 | |
ae78dbfa | 150 | static int netif_rx_internal(struct sk_buff *skb); |
54951194 LP |
151 | static int call_netdevice_notifiers_info(unsigned long val, |
152 | struct net_device *dev, | |
153 | struct netdev_notifier_info *info); | |
ae78dbfa | 154 | |
1da177e4 | 155 | /* |
7562f876 | 156 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
157 | * semaphore. |
158 | * | |
c6d14c84 | 159 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
160 | * |
161 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 162 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
163 | * actual updates. This allows pure readers to access the list even |
164 | * while a writer is preparing to update it. | |
165 | * | |
166 | * To put it another way, dev_base_lock is held for writing only to | |
167 | * protect against pure readers; the rtnl semaphore provides the | |
168 | * protection against other writers. | |
169 | * | |
170 | * See, for example usages, register_netdevice() and | |
171 | * unregister_netdevice(), which must be called with the rtnl | |
172 | * semaphore held. | |
173 | */ | |
1da177e4 | 174 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
175 | EXPORT_SYMBOL(dev_base_lock); |
176 | ||
af12fa6e ET |
177 | /* protects napi_hash addition/deletion and napi_gen_id */ |
178 | static DEFINE_SPINLOCK(napi_hash_lock); | |
179 | ||
180 | static unsigned int napi_gen_id; | |
181 | static DEFINE_HASHTABLE(napi_hash, 8); | |
182 | ||
18afa4b0 | 183 | static seqcount_t devnet_rename_seq; |
c91f6df2 | 184 | |
4e985ada TG |
185 | static inline void dev_base_seq_inc(struct net *net) |
186 | { | |
187 | while (++net->dev_base_seq == 0); | |
188 | } | |
189 | ||
881d966b | 190 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 191 | { |
95c96174 ED |
192 | unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
193 | ||
08e9897d | 194 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
195 | } |
196 | ||
881d966b | 197 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 198 | { |
7c28bd0b | 199 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
200 | } |
201 | ||
e36fa2f7 | 202 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
203 | { |
204 | #ifdef CONFIG_RPS | |
e36fa2f7 | 205 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
206 | #endif |
207 | } | |
208 | ||
e36fa2f7 | 209 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
210 | { |
211 | #ifdef CONFIG_RPS | |
e36fa2f7 | 212 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
213 | #endif |
214 | } | |
215 | ||
ce286d32 | 216 | /* Device list insertion */ |
53759be9 | 217 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 218 | { |
c346dca1 | 219 | struct net *net = dev_net(dev); |
ce286d32 EB |
220 | |
221 | ASSERT_RTNL(); | |
222 | ||
223 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 224 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
72c9528b | 225 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
fb699dfd ED |
226 | hlist_add_head_rcu(&dev->index_hlist, |
227 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 228 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
229 | |
230 | dev_base_seq_inc(net); | |
ce286d32 EB |
231 | } |
232 | ||
fb699dfd ED |
233 | /* Device list removal |
234 | * caller must respect a RCU grace period before freeing/reusing dev | |
235 | */ | |
ce286d32 EB |
236 | static void unlist_netdevice(struct net_device *dev) |
237 | { | |
238 | ASSERT_RTNL(); | |
239 | ||
240 | /* Unlink dev from the device chain */ | |
241 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 242 | list_del_rcu(&dev->dev_list); |
72c9528b | 243 | hlist_del_rcu(&dev->name_hlist); |
fb699dfd | 244 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 245 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
246 | |
247 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
248 | } |
249 | ||
1da177e4 LT |
250 | /* |
251 | * Our notifier list | |
252 | */ | |
253 | ||
f07d5b94 | 254 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
255 | |
256 | /* | |
257 | * Device drivers call our routines to queue packets here. We empty the | |
258 | * queue in the local softnet handler. | |
259 | */ | |
bea3348e | 260 | |
9958da05 | 261 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 262 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 263 | |
cf508b12 | 264 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 265 | /* |
c773e847 | 266 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
267 | * according to dev->type |
268 | */ | |
269 | static const unsigned short netdev_lock_type[] = | |
270 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
271 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
272 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
273 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
274 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
275 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
276 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
277 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
278 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
279 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
280 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
281 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
211ed865 PG |
282 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, |
283 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
284 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
723e98b7 | 285 | |
36cbd3dc | 286 | static const char *const netdev_lock_name[] = |
723e98b7 JP |
287 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
288 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
289 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
290 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
291 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
292 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
293 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
294 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
295 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
296 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
297 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
298 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
211ed865 PG |
299 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", |
300 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
301 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
723e98b7 JP |
302 | |
303 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 304 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
305 | |
306 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
307 | { | |
308 | int i; | |
309 | ||
310 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
311 | if (netdev_lock_type[i] == dev_type) | |
312 | return i; | |
313 | /* the last key is used by default */ | |
314 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
315 | } | |
316 | ||
cf508b12 DM |
317 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
318 | unsigned short dev_type) | |
723e98b7 JP |
319 | { |
320 | int i; | |
321 | ||
322 | i = netdev_lock_pos(dev_type); | |
323 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
324 | netdev_lock_name[i]); | |
325 | } | |
cf508b12 DM |
326 | |
327 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
328 | { | |
329 | int i; | |
330 | ||
331 | i = netdev_lock_pos(dev->type); | |
332 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
333 | &netdev_addr_lock_key[i], | |
334 | netdev_lock_name[i]); | |
335 | } | |
723e98b7 | 336 | #else |
cf508b12 DM |
337 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
338 | unsigned short dev_type) | |
339 | { | |
340 | } | |
341 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
342 | { |
343 | } | |
344 | #endif | |
1da177e4 LT |
345 | |
346 | /******************************************************************************* | |
347 | ||
348 | Protocol management and registration routines | |
349 | ||
350 | *******************************************************************************/ | |
351 | ||
1da177e4 LT |
352 | /* |
353 | * Add a protocol ID to the list. Now that the input handler is | |
354 | * smarter we can dispense with all the messy stuff that used to be | |
355 | * here. | |
356 | * | |
357 | * BEWARE!!! Protocol handlers, mangling input packets, | |
358 | * MUST BE last in hash buckets and checking protocol handlers | |
359 | * MUST start from promiscuous ptype_all chain in net_bh. | |
360 | * It is true now, do not change it. | |
361 | * Explanation follows: if protocol handler, mangling packet, will | |
362 | * be the first on list, it is not able to sense, that packet | |
363 | * is cloned and should be copied-on-write, so that it will | |
364 | * change it and subsequent readers will get broken packet. | |
365 | * --ANK (980803) | |
366 | */ | |
367 | ||
c07b68e8 ED |
368 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
369 | { | |
370 | if (pt->type == htons(ETH_P_ALL)) | |
371 | return &ptype_all; | |
372 | else | |
373 | return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
374 | } | |
375 | ||
1da177e4 LT |
376 | /** |
377 | * dev_add_pack - add packet handler | |
378 | * @pt: packet type declaration | |
379 | * | |
380 | * Add a protocol handler to the networking stack. The passed &packet_type | |
381 | * is linked into kernel lists and may not be freed until it has been | |
382 | * removed from the kernel lists. | |
383 | * | |
4ec93edb | 384 | * This call does not sleep therefore it can not |
1da177e4 LT |
385 | * guarantee all CPU's that are in middle of receiving packets |
386 | * will see the new packet type (until the next received packet). | |
387 | */ | |
388 | ||
389 | void dev_add_pack(struct packet_type *pt) | |
390 | { | |
c07b68e8 | 391 | struct list_head *head = ptype_head(pt); |
1da177e4 | 392 | |
c07b68e8 ED |
393 | spin_lock(&ptype_lock); |
394 | list_add_rcu(&pt->list, head); | |
395 | spin_unlock(&ptype_lock); | |
1da177e4 | 396 | } |
d1b19dff | 397 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 398 | |
1da177e4 LT |
399 | /** |
400 | * __dev_remove_pack - remove packet handler | |
401 | * @pt: packet type declaration | |
402 | * | |
403 | * Remove a protocol handler that was previously added to the kernel | |
404 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
405 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 406 | * returns. |
1da177e4 LT |
407 | * |
408 | * The packet type might still be in use by receivers | |
409 | * and must not be freed until after all the CPU's have gone | |
410 | * through a quiescent state. | |
411 | */ | |
412 | void __dev_remove_pack(struct packet_type *pt) | |
413 | { | |
c07b68e8 | 414 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
415 | struct packet_type *pt1; |
416 | ||
c07b68e8 | 417 | spin_lock(&ptype_lock); |
1da177e4 LT |
418 | |
419 | list_for_each_entry(pt1, head, list) { | |
420 | if (pt == pt1) { | |
421 | list_del_rcu(&pt->list); | |
422 | goto out; | |
423 | } | |
424 | } | |
425 | ||
7b6cd1ce | 426 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 427 | out: |
c07b68e8 | 428 | spin_unlock(&ptype_lock); |
1da177e4 | 429 | } |
d1b19dff ED |
430 | EXPORT_SYMBOL(__dev_remove_pack); |
431 | ||
1da177e4 LT |
432 | /** |
433 | * dev_remove_pack - remove packet handler | |
434 | * @pt: packet type declaration | |
435 | * | |
436 | * Remove a protocol handler that was previously added to the kernel | |
437 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
438 | * from the kernel lists and can be freed or reused once this function | |
439 | * returns. | |
440 | * | |
441 | * This call sleeps to guarantee that no CPU is looking at the packet | |
442 | * type after return. | |
443 | */ | |
444 | void dev_remove_pack(struct packet_type *pt) | |
445 | { | |
446 | __dev_remove_pack(pt); | |
4ec93edb | 447 | |
1da177e4 LT |
448 | synchronize_net(); |
449 | } | |
d1b19dff | 450 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 451 | |
62532da9 VY |
452 | |
453 | /** | |
454 | * dev_add_offload - register offload handlers | |
455 | * @po: protocol offload declaration | |
456 | * | |
457 | * Add protocol offload handlers to the networking stack. The passed | |
458 | * &proto_offload is linked into kernel lists and may not be freed until | |
459 | * it has been removed from the kernel lists. | |
460 | * | |
461 | * This call does not sleep therefore it can not | |
462 | * guarantee all CPU's that are in middle of receiving packets | |
463 | * will see the new offload handlers (until the next received packet). | |
464 | */ | |
465 | void dev_add_offload(struct packet_offload *po) | |
466 | { | |
467 | struct list_head *head = &offload_base; | |
468 | ||
469 | spin_lock(&offload_lock); | |
470 | list_add_rcu(&po->list, head); | |
471 | spin_unlock(&offload_lock); | |
472 | } | |
473 | EXPORT_SYMBOL(dev_add_offload); | |
474 | ||
475 | /** | |
476 | * __dev_remove_offload - remove offload handler | |
477 | * @po: packet offload declaration | |
478 | * | |
479 | * Remove a protocol offload handler that was previously added to the | |
480 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
481 | * is removed from the kernel lists and can be freed or reused once this | |
482 | * function returns. | |
483 | * | |
484 | * The packet type might still be in use by receivers | |
485 | * and must not be freed until after all the CPU's have gone | |
486 | * through a quiescent state. | |
487 | */ | |
1d143d9f | 488 | static void __dev_remove_offload(struct packet_offload *po) |
62532da9 VY |
489 | { |
490 | struct list_head *head = &offload_base; | |
491 | struct packet_offload *po1; | |
492 | ||
c53aa505 | 493 | spin_lock(&offload_lock); |
62532da9 VY |
494 | |
495 | list_for_each_entry(po1, head, list) { | |
496 | if (po == po1) { | |
497 | list_del_rcu(&po->list); | |
498 | goto out; | |
499 | } | |
500 | } | |
501 | ||
502 | pr_warn("dev_remove_offload: %p not found\n", po); | |
503 | out: | |
c53aa505 | 504 | spin_unlock(&offload_lock); |
62532da9 | 505 | } |
62532da9 VY |
506 | |
507 | /** | |
508 | * dev_remove_offload - remove packet offload handler | |
509 | * @po: packet offload declaration | |
510 | * | |
511 | * Remove a packet offload handler that was previously added to the kernel | |
512 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
513 | * removed from the kernel lists and can be freed or reused once this | |
514 | * function returns. | |
515 | * | |
516 | * This call sleeps to guarantee that no CPU is looking at the packet | |
517 | * type after return. | |
518 | */ | |
519 | void dev_remove_offload(struct packet_offload *po) | |
520 | { | |
521 | __dev_remove_offload(po); | |
522 | ||
523 | synchronize_net(); | |
524 | } | |
525 | EXPORT_SYMBOL(dev_remove_offload); | |
526 | ||
1da177e4 LT |
527 | /****************************************************************************** |
528 | ||
529 | Device Boot-time Settings Routines | |
530 | ||
531 | *******************************************************************************/ | |
532 | ||
533 | /* Boot time configuration table */ | |
534 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
535 | ||
536 | /** | |
537 | * netdev_boot_setup_add - add new setup entry | |
538 | * @name: name of the device | |
539 | * @map: configured settings for the device | |
540 | * | |
541 | * Adds new setup entry to the dev_boot_setup list. The function | |
542 | * returns 0 on error and 1 on success. This is a generic routine to | |
543 | * all netdevices. | |
544 | */ | |
545 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
546 | { | |
547 | struct netdev_boot_setup *s; | |
548 | int i; | |
549 | ||
550 | s = dev_boot_setup; | |
551 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
552 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
553 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 554 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
555 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
556 | break; | |
557 | } | |
558 | } | |
559 | ||
560 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
561 | } | |
562 | ||
563 | /** | |
564 | * netdev_boot_setup_check - check boot time settings | |
565 | * @dev: the netdevice | |
566 | * | |
567 | * Check boot time settings for the device. | |
568 | * The found settings are set for the device to be used | |
569 | * later in the device probing. | |
570 | * Returns 0 if no settings found, 1 if they are. | |
571 | */ | |
572 | int netdev_boot_setup_check(struct net_device *dev) | |
573 | { | |
574 | struct netdev_boot_setup *s = dev_boot_setup; | |
575 | int i; | |
576 | ||
577 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
578 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 579 | !strcmp(dev->name, s[i].name)) { |
1da177e4 LT |
580 | dev->irq = s[i].map.irq; |
581 | dev->base_addr = s[i].map.base_addr; | |
582 | dev->mem_start = s[i].map.mem_start; | |
583 | dev->mem_end = s[i].map.mem_end; | |
584 | return 1; | |
585 | } | |
586 | } | |
587 | return 0; | |
588 | } | |
d1b19dff | 589 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
590 | |
591 | ||
592 | /** | |
593 | * netdev_boot_base - get address from boot time settings | |
594 | * @prefix: prefix for network device | |
595 | * @unit: id for network device | |
596 | * | |
597 | * Check boot time settings for the base address of device. | |
598 | * The found settings are set for the device to be used | |
599 | * later in the device probing. | |
600 | * Returns 0 if no settings found. | |
601 | */ | |
602 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
603 | { | |
604 | const struct netdev_boot_setup *s = dev_boot_setup; | |
605 | char name[IFNAMSIZ]; | |
606 | int i; | |
607 | ||
608 | sprintf(name, "%s%d", prefix, unit); | |
609 | ||
610 | /* | |
611 | * If device already registered then return base of 1 | |
612 | * to indicate not to probe for this interface | |
613 | */ | |
881d966b | 614 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
615 | return 1; |
616 | ||
617 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
618 | if (!strcmp(name, s[i].name)) | |
619 | return s[i].map.base_addr; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Saves at boot time configured settings for any netdevice. | |
625 | */ | |
626 | int __init netdev_boot_setup(char *str) | |
627 | { | |
628 | int ints[5]; | |
629 | struct ifmap map; | |
630 | ||
631 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
632 | if (!str || !*str) | |
633 | return 0; | |
634 | ||
635 | /* Save settings */ | |
636 | memset(&map, 0, sizeof(map)); | |
637 | if (ints[0] > 0) | |
638 | map.irq = ints[1]; | |
639 | if (ints[0] > 1) | |
640 | map.base_addr = ints[2]; | |
641 | if (ints[0] > 2) | |
642 | map.mem_start = ints[3]; | |
643 | if (ints[0] > 3) | |
644 | map.mem_end = ints[4]; | |
645 | ||
646 | /* Add new entry to the list */ | |
647 | return netdev_boot_setup_add(str, &map); | |
648 | } | |
649 | ||
650 | __setup("netdev=", netdev_boot_setup); | |
651 | ||
652 | /******************************************************************************* | |
653 | ||
654 | Device Interface Subroutines | |
655 | ||
656 | *******************************************************************************/ | |
657 | ||
658 | /** | |
659 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 660 | * @net: the applicable net namespace |
1da177e4 LT |
661 | * @name: name to find |
662 | * | |
663 | * Find an interface by name. Must be called under RTNL semaphore | |
664 | * or @dev_base_lock. If the name is found a pointer to the device | |
665 | * is returned. If the name is not found then %NULL is returned. The | |
666 | * reference counters are not incremented so the caller must be | |
667 | * careful with locks. | |
668 | */ | |
669 | ||
881d966b | 670 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 671 | { |
0bd8d536 ED |
672 | struct net_device *dev; |
673 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 674 | |
b67bfe0d | 675 | hlist_for_each_entry(dev, head, name_hlist) |
1da177e4 LT |
676 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
677 | return dev; | |
0bd8d536 | 678 | |
1da177e4 LT |
679 | return NULL; |
680 | } | |
d1b19dff | 681 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 682 | |
72c9528b ED |
683 | /** |
684 | * dev_get_by_name_rcu - find a device by its name | |
685 | * @net: the applicable net namespace | |
686 | * @name: name to find | |
687 | * | |
688 | * Find an interface by name. | |
689 | * If the name is found a pointer to the device is returned. | |
690 | * If the name is not found then %NULL is returned. | |
691 | * The reference counters are not incremented so the caller must be | |
692 | * careful with locks. The caller must hold RCU lock. | |
693 | */ | |
694 | ||
695 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
696 | { | |
72c9528b ED |
697 | struct net_device *dev; |
698 | struct hlist_head *head = dev_name_hash(net, name); | |
699 | ||
b67bfe0d | 700 | hlist_for_each_entry_rcu(dev, head, name_hlist) |
72c9528b ED |
701 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
702 | return dev; | |
703 | ||
704 | return NULL; | |
705 | } | |
706 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
707 | ||
1da177e4 LT |
708 | /** |
709 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 710 | * @net: the applicable net namespace |
1da177e4 LT |
711 | * @name: name to find |
712 | * | |
713 | * Find an interface by name. This can be called from any | |
714 | * context and does its own locking. The returned handle has | |
715 | * the usage count incremented and the caller must use dev_put() to | |
716 | * release it when it is no longer needed. %NULL is returned if no | |
717 | * matching device is found. | |
718 | */ | |
719 | ||
881d966b | 720 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
721 | { |
722 | struct net_device *dev; | |
723 | ||
72c9528b ED |
724 | rcu_read_lock(); |
725 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
726 | if (dev) |
727 | dev_hold(dev); | |
72c9528b | 728 | rcu_read_unlock(); |
1da177e4 LT |
729 | return dev; |
730 | } | |
d1b19dff | 731 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
732 | |
733 | /** | |
734 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 735 | * @net: the applicable net namespace |
1da177e4 LT |
736 | * @ifindex: index of device |
737 | * | |
738 | * Search for an interface by index. Returns %NULL if the device | |
739 | * is not found or a pointer to the device. The device has not | |
740 | * had its reference counter increased so the caller must be careful | |
741 | * about locking. The caller must hold either the RTNL semaphore | |
742 | * or @dev_base_lock. | |
743 | */ | |
744 | ||
881d966b | 745 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 746 | { |
0bd8d536 ED |
747 | struct net_device *dev; |
748 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 749 | |
b67bfe0d | 750 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
751 | if (dev->ifindex == ifindex) |
752 | return dev; | |
0bd8d536 | 753 | |
1da177e4 LT |
754 | return NULL; |
755 | } | |
d1b19dff | 756 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 757 | |
fb699dfd ED |
758 | /** |
759 | * dev_get_by_index_rcu - find a device by its ifindex | |
760 | * @net: the applicable net namespace | |
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 RCU lock. | |
767 | */ | |
768 | ||
769 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
770 | { | |
fb699dfd ED |
771 | struct net_device *dev; |
772 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
773 | ||
b67bfe0d | 774 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
775 | if (dev->ifindex == ifindex) |
776 | return dev; | |
777 | ||
778 | return NULL; | |
779 | } | |
780 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
781 | ||
1da177e4 LT |
782 | |
783 | /** | |
784 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 785 | * @net: the applicable net namespace |
1da177e4 LT |
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 returned has | |
790 | * had a reference added and the pointer is safe until the user calls | |
791 | * dev_put to indicate they have finished with it. | |
792 | */ | |
793 | ||
881d966b | 794 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
795 | { |
796 | struct net_device *dev; | |
797 | ||
fb699dfd ED |
798 | rcu_read_lock(); |
799 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
800 | if (dev) |
801 | dev_hold(dev); | |
fb699dfd | 802 | rcu_read_unlock(); |
1da177e4 LT |
803 | return dev; |
804 | } | |
d1b19dff | 805 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 806 | |
5dbe7c17 NS |
807 | /** |
808 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
809 | * @net: network namespace | |
810 | * @name: a pointer to the buffer where the name will be stored. | |
811 | * @ifindex: the ifindex of the interface to get the name from. | |
812 | * | |
813 | * The use of raw_seqcount_begin() and cond_resched() before | |
814 | * retrying is required as we want to give the writers a chance | |
815 | * to complete when CONFIG_PREEMPT is not set. | |
816 | */ | |
817 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
818 | { | |
819 | struct net_device *dev; | |
820 | unsigned int seq; | |
821 | ||
822 | retry: | |
823 | seq = raw_seqcount_begin(&devnet_rename_seq); | |
824 | rcu_read_lock(); | |
825 | dev = dev_get_by_index_rcu(net, ifindex); | |
826 | if (!dev) { | |
827 | rcu_read_unlock(); | |
828 | return -ENODEV; | |
829 | } | |
830 | ||
831 | strcpy(name, dev->name); | |
832 | rcu_read_unlock(); | |
833 | if (read_seqcount_retry(&devnet_rename_seq, seq)) { | |
834 | cond_resched(); | |
835 | goto retry; | |
836 | } | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
1da177e4 | 841 | /** |
941666c2 | 842 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 843 | * @net: the applicable net namespace |
1da177e4 LT |
844 | * @type: media type of device |
845 | * @ha: hardware address | |
846 | * | |
847 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
848 | * is not found or a pointer to the device. |
849 | * The caller must hold RCU or RTNL. | |
941666c2 | 850 | * The returned device has not had its ref count increased |
1da177e4 LT |
851 | * and the caller must therefore be careful about locking |
852 | * | |
1da177e4 LT |
853 | */ |
854 | ||
941666c2 ED |
855 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
856 | const char *ha) | |
1da177e4 LT |
857 | { |
858 | struct net_device *dev; | |
859 | ||
941666c2 | 860 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
861 | if (dev->type == type && |
862 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
863 | return dev; |
864 | ||
865 | return NULL; | |
1da177e4 | 866 | } |
941666c2 | 867 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 868 | |
881d966b | 869 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
870 | { |
871 | struct net_device *dev; | |
872 | ||
4e9cac2b | 873 | ASSERT_RTNL(); |
881d966b | 874 | for_each_netdev(net, dev) |
4e9cac2b | 875 | if (dev->type == type) |
7562f876 PE |
876 | return dev; |
877 | ||
878 | return NULL; | |
4e9cac2b | 879 | } |
4e9cac2b PM |
880 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
881 | ||
881d966b | 882 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 883 | { |
99fe3c39 | 884 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 885 | |
99fe3c39 ED |
886 | rcu_read_lock(); |
887 | for_each_netdev_rcu(net, dev) | |
888 | if (dev->type == type) { | |
889 | dev_hold(dev); | |
890 | ret = dev; | |
891 | break; | |
892 | } | |
893 | rcu_read_unlock(); | |
894 | return ret; | |
1da177e4 | 895 | } |
1da177e4 LT |
896 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
897 | ||
898 | /** | |
bb69ae04 | 899 | * dev_get_by_flags_rcu - find any device with given flags |
c4ea43c5 | 900 | * @net: the applicable net namespace |
1da177e4 LT |
901 | * @if_flags: IFF_* values |
902 | * @mask: bitmask of bits in if_flags to check | |
903 | * | |
904 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 ED |
905 | * is not found or a pointer to the device. Must be called inside |
906 | * rcu_read_lock(), and result refcount is unchanged. | |
1da177e4 LT |
907 | */ |
908 | ||
bb69ae04 | 909 | struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags, |
d1b19dff | 910 | unsigned short mask) |
1da177e4 | 911 | { |
7562f876 | 912 | struct net_device *dev, *ret; |
1da177e4 | 913 | |
7562f876 | 914 | ret = NULL; |
c6d14c84 | 915 | for_each_netdev_rcu(net, dev) { |
1da177e4 | 916 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 917 | ret = dev; |
1da177e4 LT |
918 | break; |
919 | } | |
920 | } | |
7562f876 | 921 | return ret; |
1da177e4 | 922 | } |
bb69ae04 | 923 | EXPORT_SYMBOL(dev_get_by_flags_rcu); |
1da177e4 LT |
924 | |
925 | /** | |
926 | * dev_valid_name - check if name is okay for network device | |
927 | * @name: name string | |
928 | * | |
929 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
930 | * to allow sysfs to work. We also disallow any kind of |
931 | * whitespace. | |
1da177e4 | 932 | */ |
95f050bf | 933 | bool dev_valid_name(const char *name) |
1da177e4 | 934 | { |
c7fa9d18 | 935 | if (*name == '\0') |
95f050bf | 936 | return false; |
b6fe17d6 | 937 | if (strlen(name) >= IFNAMSIZ) |
95f050bf | 938 | return false; |
c7fa9d18 | 939 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 940 | return false; |
c7fa9d18 DM |
941 | |
942 | while (*name) { | |
943 | if (*name == '/' || isspace(*name)) | |
95f050bf | 944 | return false; |
c7fa9d18 DM |
945 | name++; |
946 | } | |
95f050bf | 947 | return true; |
1da177e4 | 948 | } |
d1b19dff | 949 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
950 | |
951 | /** | |
b267b179 EB |
952 | * __dev_alloc_name - allocate a name for a device |
953 | * @net: network namespace to allocate the device name in | |
1da177e4 | 954 | * @name: name format string |
b267b179 | 955 | * @buf: scratch buffer and result name string |
1da177e4 LT |
956 | * |
957 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
958 | * id. It scans list of devices to build up a free map, then chooses |
959 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
960 | * while allocating the name and adding the device in order to avoid | |
961 | * duplicates. | |
962 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
963 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
964 | */ |
965 | ||
b267b179 | 966 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
967 | { |
968 | int i = 0; | |
1da177e4 LT |
969 | const char *p; |
970 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 971 | unsigned long *inuse; |
1da177e4 LT |
972 | struct net_device *d; |
973 | ||
974 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
975 | if (p) { | |
976 | /* | |
977 | * Verify the string as this thing may have come from | |
978 | * the user. There must be either one "%d" and no other "%" | |
979 | * characters. | |
980 | */ | |
981 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
982 | return -EINVAL; | |
983 | ||
984 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 985 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
986 | if (!inuse) |
987 | return -ENOMEM; | |
988 | ||
881d966b | 989 | for_each_netdev(net, d) { |
1da177e4 LT |
990 | if (!sscanf(d->name, name, &i)) |
991 | continue; | |
992 | if (i < 0 || i >= max_netdevices) | |
993 | continue; | |
994 | ||
995 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 996 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
997 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
998 | set_bit(i, inuse); | |
999 | } | |
1000 | ||
1001 | i = find_first_zero_bit(inuse, max_netdevices); | |
1002 | free_page((unsigned long) inuse); | |
1003 | } | |
1004 | ||
d9031024 OP |
1005 | if (buf != name) |
1006 | snprintf(buf, IFNAMSIZ, name, i); | |
b267b179 | 1007 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1008 | return i; |
1da177e4 LT |
1009 | |
1010 | /* It is possible to run out of possible slots | |
1011 | * when the name is long and there isn't enough space left | |
1012 | * for the digits, or if all bits are used. | |
1013 | */ | |
1014 | return -ENFILE; | |
1015 | } | |
1016 | ||
b267b179 EB |
1017 | /** |
1018 | * dev_alloc_name - allocate a name for a device | |
1019 | * @dev: device | |
1020 | * @name: name format string | |
1021 | * | |
1022 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1023 | * id. It scans list of devices to build up a free map, then chooses | |
1024 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1025 | * while allocating the name and adding the device in order to avoid | |
1026 | * duplicates. | |
1027 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1028 | * Returns the number of the unit assigned or a negative errno code. | |
1029 | */ | |
1030 | ||
1031 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1032 | { | |
1033 | char buf[IFNAMSIZ]; | |
1034 | struct net *net; | |
1035 | int ret; | |
1036 | ||
c346dca1 YH |
1037 | BUG_ON(!dev_net(dev)); |
1038 | net = dev_net(dev); | |
b267b179 EB |
1039 | ret = __dev_alloc_name(net, name, buf); |
1040 | if (ret >= 0) | |
1041 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1042 | return ret; | |
1043 | } | |
d1b19dff | 1044 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1045 | |
828de4f6 G |
1046 | static int dev_alloc_name_ns(struct net *net, |
1047 | struct net_device *dev, | |
1048 | const char *name) | |
d9031024 | 1049 | { |
828de4f6 G |
1050 | char buf[IFNAMSIZ]; |
1051 | int ret; | |
8ce6cebc | 1052 | |
828de4f6 G |
1053 | ret = __dev_alloc_name(net, name, buf); |
1054 | if (ret >= 0) | |
1055 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | static int dev_get_valid_name(struct net *net, | |
1060 | struct net_device *dev, | |
1061 | const char *name) | |
1062 | { | |
1063 | BUG_ON(!net); | |
8ce6cebc | 1064 | |
d9031024 OP |
1065 | if (!dev_valid_name(name)) |
1066 | return -EINVAL; | |
1067 | ||
1c5cae81 | 1068 | if (strchr(name, '%')) |
828de4f6 | 1069 | return dev_alloc_name_ns(net, dev, name); |
d9031024 OP |
1070 | else if (__dev_get_by_name(net, name)) |
1071 | return -EEXIST; | |
8ce6cebc DL |
1072 | else if (dev->name != name) |
1073 | strlcpy(dev->name, name, IFNAMSIZ); | |
d9031024 OP |
1074 | |
1075 | return 0; | |
1076 | } | |
1da177e4 LT |
1077 | |
1078 | /** | |
1079 | * dev_change_name - change name of a device | |
1080 | * @dev: device | |
1081 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1082 | * | |
1083 | * Change name of a device, can pass format strings "eth%d". | |
1084 | * for wildcarding. | |
1085 | */ | |
cf04a4c7 | 1086 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1087 | { |
fcc5a03a | 1088 | char oldname[IFNAMSIZ]; |
1da177e4 | 1089 | int err = 0; |
fcc5a03a | 1090 | int ret; |
881d966b | 1091 | struct net *net; |
1da177e4 LT |
1092 | |
1093 | ASSERT_RTNL(); | |
c346dca1 | 1094 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1095 | |
c346dca1 | 1096 | net = dev_net(dev); |
1da177e4 LT |
1097 | if (dev->flags & IFF_UP) |
1098 | return -EBUSY; | |
1099 | ||
30e6c9fa | 1100 | write_seqcount_begin(&devnet_rename_seq); |
c91f6df2 BH |
1101 | |
1102 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
30e6c9fa | 1103 | write_seqcount_end(&devnet_rename_seq); |
c8d90dca | 1104 | return 0; |
c91f6df2 | 1105 | } |
c8d90dca | 1106 | |
fcc5a03a HX |
1107 | memcpy(oldname, dev->name, IFNAMSIZ); |
1108 | ||
828de4f6 | 1109 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1110 | if (err < 0) { |
30e6c9fa | 1111 | write_seqcount_end(&devnet_rename_seq); |
d9031024 | 1112 | return err; |
c91f6df2 | 1113 | } |
1da177e4 | 1114 | |
fcc5a03a | 1115 | rollback: |
a1b3f594 EB |
1116 | ret = device_rename(&dev->dev, dev->name); |
1117 | if (ret) { | |
1118 | memcpy(dev->name, oldname, IFNAMSIZ); | |
30e6c9fa | 1119 | write_seqcount_end(&devnet_rename_seq); |
a1b3f594 | 1120 | return ret; |
dcc99773 | 1121 | } |
7f988eab | 1122 | |
30e6c9fa | 1123 | write_seqcount_end(&devnet_rename_seq); |
c91f6df2 | 1124 | |
5bb025fa VF |
1125 | netdev_adjacent_rename_links(dev, oldname); |
1126 | ||
7f988eab | 1127 | write_lock_bh(&dev_base_lock); |
372b2312 | 1128 | hlist_del_rcu(&dev->name_hlist); |
72c9528b ED |
1129 | write_unlock_bh(&dev_base_lock); |
1130 | ||
1131 | synchronize_rcu(); | |
1132 | ||
1133 | write_lock_bh(&dev_base_lock); | |
1134 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
7f988eab HX |
1135 | write_unlock_bh(&dev_base_lock); |
1136 | ||
056925ab | 1137 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1138 | ret = notifier_to_errno(ret); |
1139 | ||
1140 | if (ret) { | |
91e9c07b ED |
1141 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1142 | if (err >= 0) { | |
fcc5a03a | 1143 | err = ret; |
30e6c9fa | 1144 | write_seqcount_begin(&devnet_rename_seq); |
fcc5a03a | 1145 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1146 | memcpy(oldname, newname, IFNAMSIZ); |
fcc5a03a | 1147 | goto rollback; |
91e9c07b | 1148 | } else { |
7b6cd1ce | 1149 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1150 | dev->name, ret); |
fcc5a03a HX |
1151 | } |
1152 | } | |
1da177e4 LT |
1153 | |
1154 | return err; | |
1155 | } | |
1156 | ||
0b815a1a SH |
1157 | /** |
1158 | * dev_set_alias - change ifalias of a device | |
1159 | * @dev: device | |
1160 | * @alias: name up to IFALIASZ | |
f0db275a | 1161 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1162 | * |
1163 | * Set ifalias for a device, | |
1164 | */ | |
1165 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1166 | { | |
7364e445 AK |
1167 | char *new_ifalias; |
1168 | ||
0b815a1a SH |
1169 | ASSERT_RTNL(); |
1170 | ||
1171 | if (len >= IFALIASZ) | |
1172 | return -EINVAL; | |
1173 | ||
96ca4a2c | 1174 | if (!len) { |
388dfc2d SK |
1175 | kfree(dev->ifalias); |
1176 | dev->ifalias = NULL; | |
96ca4a2c OH |
1177 | return 0; |
1178 | } | |
1179 | ||
7364e445 AK |
1180 | new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
1181 | if (!new_ifalias) | |
0b815a1a | 1182 | return -ENOMEM; |
7364e445 | 1183 | dev->ifalias = new_ifalias; |
0b815a1a SH |
1184 | |
1185 | strlcpy(dev->ifalias, alias, len+1); | |
1186 | return len; | |
1187 | } | |
1188 | ||
1189 | ||
d8a33ac4 | 1190 | /** |
3041a069 | 1191 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1192 | * @dev: device to cause notification |
1193 | * | |
1194 | * Called to indicate a device has changed features. | |
1195 | */ | |
1196 | void netdev_features_change(struct net_device *dev) | |
1197 | { | |
056925ab | 1198 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1199 | } |
1200 | EXPORT_SYMBOL(netdev_features_change); | |
1201 | ||
1da177e4 LT |
1202 | /** |
1203 | * netdev_state_change - device changes state | |
1204 | * @dev: device to cause notification | |
1205 | * | |
1206 | * Called to indicate a device has changed state. This function calls | |
1207 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1208 | * to the routing socket. | |
1209 | */ | |
1210 | void netdev_state_change(struct net_device *dev) | |
1211 | { | |
1212 | if (dev->flags & IFF_UP) { | |
54951194 LP |
1213 | struct netdev_notifier_change_info change_info; |
1214 | ||
1215 | change_info.flags_changed = 0; | |
1216 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
1217 | &change_info.info); | |
7f294054 | 1218 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1219 | } |
1220 | } | |
d1b19dff | 1221 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1222 | |
ee89bab1 AW |
1223 | /** |
1224 | * netdev_notify_peers - notify network peers about existence of @dev | |
1225 | * @dev: network device | |
1226 | * | |
1227 | * Generate traffic such that interested network peers are aware of | |
1228 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1229 | * a device wants to inform the rest of the network about some sort of | |
1230 | * reconfiguration such as a failover event or virtual machine | |
1231 | * migration. | |
1232 | */ | |
1233 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1234 | { |
ee89bab1 AW |
1235 | rtnl_lock(); |
1236 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
1237 | rtnl_unlock(); | |
c1da4ac7 | 1238 | } |
ee89bab1 | 1239 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1240 | |
bd380811 | 1241 | static int __dev_open(struct net_device *dev) |
1da177e4 | 1242 | { |
d314774c | 1243 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1244 | int ret; |
1da177e4 | 1245 | |
e46b66bc BH |
1246 | ASSERT_RTNL(); |
1247 | ||
1da177e4 LT |
1248 | if (!netif_device_present(dev)) |
1249 | return -ENODEV; | |
1250 | ||
ca99ca14 NH |
1251 | /* Block netpoll from trying to do any rx path servicing. |
1252 | * If we don't do this there is a chance ndo_poll_controller | |
1253 | * or ndo_poll may be running while we open the device | |
1254 | */ | |
66b5552f | 1255 | netpoll_poll_disable(dev); |
ca99ca14 | 1256 | |
3b8bcfd5 JB |
1257 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
1258 | ret = notifier_to_errno(ret); | |
1259 | if (ret) | |
1260 | return ret; | |
1261 | ||
1da177e4 | 1262 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1263 | |
d314774c SH |
1264 | if (ops->ndo_validate_addr) |
1265 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1266 | |
d314774c SH |
1267 | if (!ret && ops->ndo_open) |
1268 | ret = ops->ndo_open(dev); | |
1da177e4 | 1269 | |
66b5552f | 1270 | netpoll_poll_enable(dev); |
ca99ca14 | 1271 | |
bada339b JG |
1272 | if (ret) |
1273 | clear_bit(__LINK_STATE_START, &dev->state); | |
1274 | else { | |
1da177e4 | 1275 | dev->flags |= IFF_UP; |
b4bd07c2 | 1276 | net_dmaengine_get(); |
4417da66 | 1277 | dev_set_rx_mode(dev); |
1da177e4 | 1278 | dev_activate(dev); |
7bf23575 | 1279 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1280 | } |
bada339b | 1281 | |
1da177e4 LT |
1282 | return ret; |
1283 | } | |
1284 | ||
1285 | /** | |
bd380811 PM |
1286 | * dev_open - prepare an interface for use. |
1287 | * @dev: device to open | |
1da177e4 | 1288 | * |
bd380811 PM |
1289 | * Takes a device from down to up state. The device's private open |
1290 | * function is invoked and then the multicast lists are loaded. Finally | |
1291 | * the device is moved into the up state and a %NETDEV_UP message is | |
1292 | * sent to the netdev notifier chain. | |
1293 | * | |
1294 | * Calling this function on an active interface is a nop. On a failure | |
1295 | * a negative errno code is returned. | |
1da177e4 | 1296 | */ |
bd380811 PM |
1297 | int dev_open(struct net_device *dev) |
1298 | { | |
1299 | int ret; | |
1300 | ||
bd380811 PM |
1301 | if (dev->flags & IFF_UP) |
1302 | return 0; | |
1303 | ||
bd380811 PM |
1304 | ret = __dev_open(dev); |
1305 | if (ret < 0) | |
1306 | return ret; | |
1307 | ||
7f294054 | 1308 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1309 | call_netdevice_notifiers(NETDEV_UP, dev); |
1310 | ||
1311 | return ret; | |
1312 | } | |
1313 | EXPORT_SYMBOL(dev_open); | |
1314 | ||
44345724 | 1315 | static int __dev_close_many(struct list_head *head) |
1da177e4 | 1316 | { |
44345724 | 1317 | struct net_device *dev; |
e46b66bc | 1318 | |
bd380811 | 1319 | ASSERT_RTNL(); |
9d5010db DM |
1320 | might_sleep(); |
1321 | ||
5cde2829 | 1322 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1323 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1324 | netpoll_poll_disable(dev); |
3f4df206 | 1325 | |
44345724 | 1326 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1327 | |
44345724 | 1328 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1329 | |
44345724 OP |
1330 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1331 | * can be even on different cpu. So just clear netif_running(). | |
1332 | * | |
1333 | * dev->stop() will invoke napi_disable() on all of it's | |
1334 | * napi_struct instances on this device. | |
1335 | */ | |
4e857c58 | 1336 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1337 | } |
1da177e4 | 1338 | |
44345724 | 1339 | dev_deactivate_many(head); |
d8b2a4d2 | 1340 | |
5cde2829 | 1341 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1342 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1343 | |
44345724 OP |
1344 | /* |
1345 | * Call the device specific close. This cannot fail. | |
1346 | * Only if device is UP | |
1347 | * | |
1348 | * We allow it to be called even after a DETACH hot-plug | |
1349 | * event. | |
1350 | */ | |
1351 | if (ops->ndo_stop) | |
1352 | ops->ndo_stop(dev); | |
1353 | ||
44345724 | 1354 | dev->flags &= ~IFF_UP; |
44345724 | 1355 | net_dmaengine_put(); |
66b5552f | 1356 | netpoll_poll_enable(dev); |
44345724 OP |
1357 | } |
1358 | ||
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | static int __dev_close(struct net_device *dev) | |
1363 | { | |
f87e6f47 | 1364 | int retval; |
44345724 OP |
1365 | LIST_HEAD(single); |
1366 | ||
5cde2829 | 1367 | list_add(&dev->close_list, &single); |
f87e6f47 LT |
1368 | retval = __dev_close_many(&single); |
1369 | list_del(&single); | |
ca99ca14 | 1370 | |
f87e6f47 | 1371 | return retval; |
44345724 OP |
1372 | } |
1373 | ||
3fbd8758 | 1374 | static int dev_close_many(struct list_head *head) |
44345724 OP |
1375 | { |
1376 | struct net_device *dev, *tmp; | |
1da177e4 | 1377 | |
5cde2829 EB |
1378 | /* Remove the devices that don't need to be closed */ |
1379 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1380 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1381 | list_del_init(&dev->close_list); |
44345724 OP |
1382 | |
1383 | __dev_close_many(head); | |
1da177e4 | 1384 | |
5cde2829 | 1385 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1386 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1387 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
5cde2829 | 1388 | list_del_init(&dev->close_list); |
44345724 | 1389 | } |
bd380811 PM |
1390 | |
1391 | return 0; | |
1392 | } | |
1393 | ||
1394 | /** | |
1395 | * dev_close - shutdown an interface. | |
1396 | * @dev: device to shutdown | |
1397 | * | |
1398 | * This function moves an active device into down state. A | |
1399 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1400 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1401 | * chain. | |
1402 | */ | |
1403 | int dev_close(struct net_device *dev) | |
1404 | { | |
e14a5993 ED |
1405 | if (dev->flags & IFF_UP) { |
1406 | LIST_HEAD(single); | |
1da177e4 | 1407 | |
5cde2829 | 1408 | list_add(&dev->close_list, &single); |
e14a5993 ED |
1409 | dev_close_many(&single); |
1410 | list_del(&single); | |
1411 | } | |
da6e378b | 1412 | return 0; |
1da177e4 | 1413 | } |
d1b19dff | 1414 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1415 | |
1416 | ||
0187bdfb BH |
1417 | /** |
1418 | * dev_disable_lro - disable Large Receive Offload on a device | |
1419 | * @dev: device | |
1420 | * | |
1421 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1422 | * called under RTNL. This is needed if received packets may be | |
1423 | * forwarded to another interface. | |
1424 | */ | |
1425 | void dev_disable_lro(struct net_device *dev) | |
1426 | { | |
f11970e3 NH |
1427 | /* |
1428 | * If we're trying to disable lro on a vlan device | |
1429 | * use the underlying physical device instead | |
1430 | */ | |
1431 | if (is_vlan_dev(dev)) | |
1432 | dev = vlan_dev_real_dev(dev); | |
1433 | ||
529d0489 MK |
1434 | /* the same for macvlan devices */ |
1435 | if (netif_is_macvlan(dev)) | |
1436 | dev = macvlan_dev_real_dev(dev); | |
1437 | ||
bc5787c6 MM |
1438 | dev->wanted_features &= ~NETIF_F_LRO; |
1439 | netdev_update_features(dev); | |
27660515 | 1440 | |
22d5969f MM |
1441 | if (unlikely(dev->features & NETIF_F_LRO)) |
1442 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
0187bdfb BH |
1443 | } |
1444 | EXPORT_SYMBOL(dev_disable_lro); | |
1445 | ||
351638e7 JP |
1446 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1447 | struct net_device *dev) | |
1448 | { | |
1449 | struct netdev_notifier_info info; | |
1450 | ||
1451 | netdev_notifier_info_init(&info, dev); | |
1452 | return nb->notifier_call(nb, val, &info); | |
1453 | } | |
0187bdfb | 1454 | |
881d966b EB |
1455 | static int dev_boot_phase = 1; |
1456 | ||
1da177e4 LT |
1457 | /** |
1458 | * register_netdevice_notifier - register a network notifier block | |
1459 | * @nb: notifier | |
1460 | * | |
1461 | * Register a notifier to be called when network device events occur. | |
1462 | * The notifier passed is linked into the kernel structures and must | |
1463 | * not be reused until it has been unregistered. A negative errno code | |
1464 | * is returned on a failure. | |
1465 | * | |
1466 | * When registered all registration and up events are replayed | |
4ec93edb | 1467 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
1468 | * view of the network device list. |
1469 | */ | |
1470 | ||
1471 | int register_netdevice_notifier(struct notifier_block *nb) | |
1472 | { | |
1473 | struct net_device *dev; | |
fcc5a03a | 1474 | struct net_device *last; |
881d966b | 1475 | struct net *net; |
1da177e4 LT |
1476 | int err; |
1477 | ||
1478 | rtnl_lock(); | |
f07d5b94 | 1479 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1480 | if (err) |
1481 | goto unlock; | |
881d966b EB |
1482 | if (dev_boot_phase) |
1483 | goto unlock; | |
1484 | for_each_net(net) { | |
1485 | for_each_netdev(net, dev) { | |
351638e7 | 1486 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
881d966b EB |
1487 | err = notifier_to_errno(err); |
1488 | if (err) | |
1489 | goto rollback; | |
1490 | ||
1491 | if (!(dev->flags & IFF_UP)) | |
1492 | continue; | |
1da177e4 | 1493 | |
351638e7 | 1494 | call_netdevice_notifier(nb, NETDEV_UP, dev); |
881d966b | 1495 | } |
1da177e4 | 1496 | } |
fcc5a03a HX |
1497 | |
1498 | unlock: | |
1da177e4 LT |
1499 | rtnl_unlock(); |
1500 | return err; | |
fcc5a03a HX |
1501 | |
1502 | rollback: | |
1503 | last = dev; | |
881d966b EB |
1504 | for_each_net(net) { |
1505 | for_each_netdev(net, dev) { | |
1506 | if (dev == last) | |
8f891489 | 1507 | goto outroll; |
fcc5a03a | 1508 | |
881d966b | 1509 | if (dev->flags & IFF_UP) { |
351638e7 JP |
1510 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1511 | dev); | |
1512 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
881d966b | 1513 | } |
351638e7 | 1514 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
fcc5a03a | 1515 | } |
fcc5a03a | 1516 | } |
c67625a1 | 1517 | |
8f891489 | 1518 | outroll: |
c67625a1 | 1519 | raw_notifier_chain_unregister(&netdev_chain, nb); |
fcc5a03a | 1520 | goto unlock; |
1da177e4 | 1521 | } |
d1b19dff | 1522 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1523 | |
1524 | /** | |
1525 | * unregister_netdevice_notifier - unregister a network notifier block | |
1526 | * @nb: notifier | |
1527 | * | |
1528 | * Unregister a notifier previously registered by | |
1529 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1530 | * kernel structures and may then be reused. A negative errno code | |
1531 | * is returned on a failure. | |
7d3d43da EB |
1532 | * |
1533 | * After unregistering unregister and down device events are synthesized | |
1534 | * for all devices on the device list to the removed notifier to remove | |
1535 | * the need for special case cleanup code. | |
1da177e4 LT |
1536 | */ |
1537 | ||
1538 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1539 | { | |
7d3d43da EB |
1540 | struct net_device *dev; |
1541 | struct net *net; | |
9f514950 HX |
1542 | int err; |
1543 | ||
1544 | rtnl_lock(); | |
f07d5b94 | 1545 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1546 | if (err) |
1547 | goto unlock; | |
1548 | ||
1549 | for_each_net(net) { | |
1550 | for_each_netdev(net, dev) { | |
1551 | if (dev->flags & IFF_UP) { | |
351638e7 JP |
1552 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1553 | dev); | |
1554 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
7d3d43da | 1555 | } |
351638e7 | 1556 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
7d3d43da EB |
1557 | } |
1558 | } | |
1559 | unlock: | |
9f514950 HX |
1560 | rtnl_unlock(); |
1561 | return err; | |
1da177e4 | 1562 | } |
d1b19dff | 1563 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1564 | |
351638e7 JP |
1565 | /** |
1566 | * call_netdevice_notifiers_info - call all network notifier blocks | |
1567 | * @val: value passed unmodified to notifier function | |
1568 | * @dev: net_device pointer passed unmodified to notifier function | |
1569 | * @info: notifier information data | |
1570 | * | |
1571 | * Call all network notifier blocks. Parameters and return value | |
1572 | * are as for raw_notifier_call_chain(). | |
1573 | */ | |
1574 | ||
1d143d9f | 1575 | static int call_netdevice_notifiers_info(unsigned long val, |
1576 | struct net_device *dev, | |
1577 | struct netdev_notifier_info *info) | |
351638e7 JP |
1578 | { |
1579 | ASSERT_RTNL(); | |
1580 | netdev_notifier_info_init(info, dev); | |
1581 | return raw_notifier_call_chain(&netdev_chain, val, info); | |
1582 | } | |
351638e7 | 1583 | |
1da177e4 LT |
1584 | /** |
1585 | * call_netdevice_notifiers - call all network notifier blocks | |
1586 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1587 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1588 | * |
1589 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1590 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1591 | */ |
1592 | ||
ad7379d4 | 1593 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1594 | { |
351638e7 JP |
1595 | struct netdev_notifier_info info; |
1596 | ||
1597 | return call_netdevice_notifiers_info(val, dev, &info); | |
1da177e4 | 1598 | } |
edf947f1 | 1599 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 1600 | |
c5905afb | 1601 | static struct static_key netstamp_needed __read_mostly; |
b90e5794 | 1602 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 1603 | /* We are not allowed to call static_key_slow_dec() from irq context |
b90e5794 | 1604 | * If net_disable_timestamp() is called from irq context, defer the |
c5905afb | 1605 | * static_key_slow_dec() calls. |
b90e5794 ED |
1606 | */ |
1607 | static atomic_t netstamp_needed_deferred; | |
1608 | #endif | |
1da177e4 LT |
1609 | |
1610 | void net_enable_timestamp(void) | |
1611 | { | |
b90e5794 ED |
1612 | #ifdef HAVE_JUMP_LABEL |
1613 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); | |
1614 | ||
1615 | if (deferred) { | |
1616 | while (--deferred) | |
c5905afb | 1617 | static_key_slow_dec(&netstamp_needed); |
b90e5794 ED |
1618 | return; |
1619 | } | |
1620 | #endif | |
c5905afb | 1621 | static_key_slow_inc(&netstamp_needed); |
1da177e4 | 1622 | } |
d1b19dff | 1623 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1624 | |
1625 | void net_disable_timestamp(void) | |
1626 | { | |
b90e5794 ED |
1627 | #ifdef HAVE_JUMP_LABEL |
1628 | if (in_interrupt()) { | |
1629 | atomic_inc(&netstamp_needed_deferred); | |
1630 | return; | |
1631 | } | |
1632 | #endif | |
c5905afb | 1633 | static_key_slow_dec(&netstamp_needed); |
1da177e4 | 1634 | } |
d1b19dff | 1635 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1636 | |
3b098e2d | 1637 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 1638 | { |
588f0330 | 1639 | skb->tstamp.tv64 = 0; |
c5905afb | 1640 | if (static_key_false(&netstamp_needed)) |
a61bbcf2 | 1641 | __net_timestamp(skb); |
1da177e4 LT |
1642 | } |
1643 | ||
588f0330 | 1644 | #define net_timestamp_check(COND, SKB) \ |
c5905afb | 1645 | if (static_key_false(&netstamp_needed)) { \ |
588f0330 ED |
1646 | if ((COND) && !(SKB)->tstamp.tv64) \ |
1647 | __net_timestamp(SKB); \ | |
1648 | } \ | |
3b098e2d | 1649 | |
1ee481fb | 1650 | bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb) |
79b569f0 DL |
1651 | { |
1652 | unsigned int len; | |
1653 | ||
1654 | if (!(dev->flags & IFF_UP)) | |
1655 | return false; | |
1656 | ||
1657 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; | |
1658 | if (skb->len <= len) | |
1659 | return true; | |
1660 | ||
1661 | /* if TSO is enabled, we don't care about the length as the packet | |
1662 | * could be forwarded without being segmented before | |
1663 | */ | |
1664 | if (skb_is_gso(skb)) | |
1665 | return true; | |
1666 | ||
1667 | return false; | |
1668 | } | |
1ee481fb | 1669 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 1670 | |
a0265d28 HX |
1671 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
1672 | { | |
1673 | if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) { | |
1674 | if (skb_copy_ubufs(skb, GFP_ATOMIC)) { | |
1675 | atomic_long_inc(&dev->rx_dropped); | |
1676 | kfree_skb(skb); | |
1677 | return NET_RX_DROP; | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | if (unlikely(!is_skb_forwardable(dev, skb))) { | |
1682 | atomic_long_inc(&dev->rx_dropped); | |
1683 | kfree_skb(skb); | |
1684 | return NET_RX_DROP; | |
1685 | } | |
1686 | ||
1687 | skb_scrub_packet(skb, true); | |
1688 | skb->protocol = eth_type_trans(skb, dev); | |
1689 | ||
1690 | return 0; | |
1691 | } | |
1692 | EXPORT_SYMBOL_GPL(__dev_forward_skb); | |
1693 | ||
44540960 AB |
1694 | /** |
1695 | * dev_forward_skb - loopback an skb to another netif | |
1696 | * | |
1697 | * @dev: destination network device | |
1698 | * @skb: buffer to forward | |
1699 | * | |
1700 | * return values: | |
1701 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 1702 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
1703 | * |
1704 | * dev_forward_skb can be used for injecting an skb from the | |
1705 | * start_xmit function of one device into the receive queue | |
1706 | * of another device. | |
1707 | * | |
1708 | * The receiving device may be in another namespace, so | |
1709 | * we have to clear all information in the skb that could | |
1710 | * impact namespace isolation. | |
1711 | */ | |
1712 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
1713 | { | |
a0265d28 | 1714 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
1715 | } |
1716 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
1717 | ||
71d9dec2 CG |
1718 | static inline int deliver_skb(struct sk_buff *skb, |
1719 | struct packet_type *pt_prev, | |
1720 | struct net_device *orig_dev) | |
1721 | { | |
1080e512 MT |
1722 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
1723 | return -ENOMEM; | |
71d9dec2 CG |
1724 | atomic_inc(&skb->users); |
1725 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1726 | } | |
1727 | ||
c0de08d0 EL |
1728 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
1729 | { | |
a3d744e9 | 1730 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
1731 | return false; |
1732 | ||
1733 | if (ptype->id_match) | |
1734 | return ptype->id_match(ptype, skb->sk); | |
1735 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
1736 | return true; | |
1737 | ||
1738 | return false; | |
1739 | } | |
1740 | ||
1da177e4 LT |
1741 | /* |
1742 | * Support routine. Sends outgoing frames to any network | |
1743 | * taps currently in use. | |
1744 | */ | |
1745 | ||
f6a78bfc | 1746 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1747 | { |
1748 | struct packet_type *ptype; | |
71d9dec2 CG |
1749 | struct sk_buff *skb2 = NULL; |
1750 | struct packet_type *pt_prev = NULL; | |
a61bbcf2 | 1751 | |
1da177e4 LT |
1752 | rcu_read_lock(); |
1753 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1754 | /* Never send packets back to the socket | |
1755 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1756 | */ | |
1757 | if ((ptype->dev == dev || !ptype->dev) && | |
c0de08d0 | 1758 | (!skb_loop_sk(ptype, skb))) { |
71d9dec2 CG |
1759 | if (pt_prev) { |
1760 | deliver_skb(skb2, pt_prev, skb->dev); | |
1761 | pt_prev = ptype; | |
1762 | continue; | |
1763 | } | |
1764 | ||
1765 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1da177e4 LT |
1766 | if (!skb2) |
1767 | break; | |
1768 | ||
70978182 ED |
1769 | net_timestamp_set(skb2); |
1770 | ||
1da177e4 LT |
1771 | /* skb->nh should be correctly |
1772 | set by sender, so that the second statement is | |
1773 | just protection against buggy protocols. | |
1774 | */ | |
459a98ed | 1775 | skb_reset_mac_header(skb2); |
1da177e4 | 1776 | |
d56f90a7 | 1777 | if (skb_network_header(skb2) < skb2->data || |
ced14f68 | 1778 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { |
e87cc472 JP |
1779 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", |
1780 | ntohs(skb2->protocol), | |
1781 | dev->name); | |
c1d2bbe1 | 1782 | skb_reset_network_header(skb2); |
1da177e4 LT |
1783 | } |
1784 | ||
b0e380b1 | 1785 | skb2->transport_header = skb2->network_header; |
1da177e4 | 1786 | skb2->pkt_type = PACKET_OUTGOING; |
71d9dec2 | 1787 | pt_prev = ptype; |
1da177e4 LT |
1788 | } |
1789 | } | |
71d9dec2 CG |
1790 | if (pt_prev) |
1791 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
1da177e4 LT |
1792 | rcu_read_unlock(); |
1793 | } | |
1794 | ||
2c53040f BH |
1795 | /** |
1796 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
1797 | * @dev: Network device |
1798 | * @txq: number of queues available | |
1799 | * | |
1800 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
1801 | * valid. To resolve this verify the tc mapping remains valid and if | |
1802 | * not NULL the mapping. With no priorities mapping to this | |
1803 | * offset/count pair it will no longer be used. In the worst case TC0 | |
1804 | * is invalid nothing can be done so disable priority mappings. If is | |
1805 | * expected that drivers will fix this mapping if they can before | |
1806 | * calling netif_set_real_num_tx_queues. | |
1807 | */ | |
bb134d22 | 1808 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
1809 | { |
1810 | int i; | |
1811 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
1812 | ||
1813 | /* If TC0 is invalidated disable TC mapping */ | |
1814 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 1815 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
1816 | dev->num_tc = 0; |
1817 | return; | |
1818 | } | |
1819 | ||
1820 | /* Invalidated prio to tc mappings set to TC0 */ | |
1821 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
1822 | int q = netdev_get_prio_tc_map(dev, i); | |
1823 | ||
1824 | tc = &dev->tc_to_txq[q]; | |
1825 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
1826 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
1827 | i, q); | |
4f57c087 JF |
1828 | netdev_set_prio_tc_map(dev, i, 0); |
1829 | } | |
1830 | } | |
1831 | } | |
1832 | ||
537c00de AD |
1833 | #ifdef CONFIG_XPS |
1834 | static DEFINE_MUTEX(xps_map_mutex); | |
1835 | #define xmap_dereference(P) \ | |
1836 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
1837 | ||
10cdc3f3 AD |
1838 | static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps, |
1839 | int cpu, u16 index) | |
537c00de | 1840 | { |
10cdc3f3 AD |
1841 | struct xps_map *map = NULL; |
1842 | int pos; | |
537c00de | 1843 | |
10cdc3f3 AD |
1844 | if (dev_maps) |
1845 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
537c00de | 1846 | |
10cdc3f3 AD |
1847 | for (pos = 0; map && pos < map->len; pos++) { |
1848 | if (map->queues[pos] == index) { | |
537c00de AD |
1849 | if (map->len > 1) { |
1850 | map->queues[pos] = map->queues[--map->len]; | |
1851 | } else { | |
10cdc3f3 | 1852 | RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL); |
537c00de AD |
1853 | kfree_rcu(map, rcu); |
1854 | map = NULL; | |
1855 | } | |
10cdc3f3 | 1856 | break; |
537c00de | 1857 | } |
537c00de AD |
1858 | } |
1859 | ||
10cdc3f3 AD |
1860 | return map; |
1861 | } | |
1862 | ||
024e9679 | 1863 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
10cdc3f3 AD |
1864 | { |
1865 | struct xps_dev_maps *dev_maps; | |
024e9679 | 1866 | int cpu, i; |
10cdc3f3 AD |
1867 | bool active = false; |
1868 | ||
1869 | mutex_lock(&xps_map_mutex); | |
1870 | dev_maps = xmap_dereference(dev->xps_maps); | |
1871 | ||
1872 | if (!dev_maps) | |
1873 | goto out_no_maps; | |
1874 | ||
1875 | for_each_possible_cpu(cpu) { | |
024e9679 AD |
1876 | for (i = index; i < dev->num_tx_queues; i++) { |
1877 | if (!remove_xps_queue(dev_maps, cpu, i)) | |
1878 | break; | |
1879 | } | |
1880 | if (i == dev->num_tx_queues) | |
10cdc3f3 AD |
1881 | active = true; |
1882 | } | |
1883 | ||
1884 | if (!active) { | |
537c00de AD |
1885 | RCU_INIT_POINTER(dev->xps_maps, NULL); |
1886 | kfree_rcu(dev_maps, rcu); | |
1887 | } | |
1888 | ||
024e9679 AD |
1889 | for (i = index; i < dev->num_tx_queues; i++) |
1890 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i), | |
1891 | NUMA_NO_NODE); | |
1892 | ||
537c00de AD |
1893 | out_no_maps: |
1894 | mutex_unlock(&xps_map_mutex); | |
1895 | } | |
1896 | ||
01c5f864 AD |
1897 | static struct xps_map *expand_xps_map(struct xps_map *map, |
1898 | int cpu, u16 index) | |
1899 | { | |
1900 | struct xps_map *new_map; | |
1901 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
1902 | int i, pos; | |
1903 | ||
1904 | for (pos = 0; map && pos < map->len; pos++) { | |
1905 | if (map->queues[pos] != index) | |
1906 | continue; | |
1907 | return map; | |
1908 | } | |
1909 | ||
1910 | /* Need to add queue to this CPU's existing map */ | |
1911 | if (map) { | |
1912 | if (pos < map->alloc_len) | |
1913 | return map; | |
1914 | ||
1915 | alloc_len = map->alloc_len * 2; | |
1916 | } | |
1917 | ||
1918 | /* Need to allocate new map to store queue on this CPU's map */ | |
1919 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
1920 | cpu_to_node(cpu)); | |
1921 | if (!new_map) | |
1922 | return NULL; | |
1923 | ||
1924 | for (i = 0; i < pos; i++) | |
1925 | new_map->queues[i] = map->queues[i]; | |
1926 | new_map->alloc_len = alloc_len; | |
1927 | new_map->len = pos; | |
1928 | ||
1929 | return new_map; | |
1930 | } | |
1931 | ||
3573540c MT |
1932 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, |
1933 | u16 index) | |
537c00de | 1934 | { |
01c5f864 | 1935 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
537c00de | 1936 | struct xps_map *map, *new_map; |
537c00de | 1937 | int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES); |
01c5f864 AD |
1938 | int cpu, numa_node_id = -2; |
1939 | bool active = false; | |
537c00de AD |
1940 | |
1941 | mutex_lock(&xps_map_mutex); | |
1942 | ||
1943 | dev_maps = xmap_dereference(dev->xps_maps); | |
1944 | ||
01c5f864 AD |
1945 | /* allocate memory for queue storage */ |
1946 | for_each_online_cpu(cpu) { | |
1947 | if (!cpumask_test_cpu(cpu, mask)) | |
1948 | continue; | |
1949 | ||
1950 | if (!new_dev_maps) | |
1951 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); | |
2bb60cb9 AD |
1952 | if (!new_dev_maps) { |
1953 | mutex_unlock(&xps_map_mutex); | |
01c5f864 | 1954 | return -ENOMEM; |
2bb60cb9 | 1955 | } |
01c5f864 AD |
1956 | |
1957 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : | |
1958 | NULL; | |
1959 | ||
1960 | map = expand_xps_map(map, cpu, index); | |
1961 | if (!map) | |
1962 | goto error; | |
1963 | ||
1964 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); | |
1965 | } | |
1966 | ||
1967 | if (!new_dev_maps) | |
1968 | goto out_no_new_maps; | |
1969 | ||
537c00de | 1970 | for_each_possible_cpu(cpu) { |
01c5f864 AD |
1971 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) { |
1972 | /* add queue to CPU maps */ | |
1973 | int pos = 0; | |
1974 | ||
1975 | map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
1976 | while ((pos < map->len) && (map->queues[pos] != index)) | |
1977 | pos++; | |
1978 | ||
1979 | if (pos == map->len) | |
1980 | map->queues[map->len++] = index; | |
537c00de | 1981 | #ifdef CONFIG_NUMA |
537c00de AD |
1982 | if (numa_node_id == -2) |
1983 | numa_node_id = cpu_to_node(cpu); | |
1984 | else if (numa_node_id != cpu_to_node(cpu)) | |
1985 | numa_node_id = -1; | |
537c00de | 1986 | #endif |
01c5f864 AD |
1987 | } else if (dev_maps) { |
1988 | /* fill in the new device map from the old device map */ | |
1989 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
1990 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); | |
537c00de | 1991 | } |
01c5f864 | 1992 | |
537c00de AD |
1993 | } |
1994 | ||
01c5f864 AD |
1995 | rcu_assign_pointer(dev->xps_maps, new_dev_maps); |
1996 | ||
537c00de | 1997 | /* Cleanup old maps */ |
01c5f864 AD |
1998 | if (dev_maps) { |
1999 | for_each_possible_cpu(cpu) { | |
2000 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
2001 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
2002 | if (map && map != new_map) | |
2003 | kfree_rcu(map, rcu); | |
2004 | } | |
537c00de | 2005 | |
01c5f864 | 2006 | kfree_rcu(dev_maps, rcu); |
537c00de AD |
2007 | } |
2008 | ||
01c5f864 AD |
2009 | dev_maps = new_dev_maps; |
2010 | active = true; | |
537c00de | 2011 | |
01c5f864 AD |
2012 | out_no_new_maps: |
2013 | /* update Tx queue numa node */ | |
537c00de AD |
2014 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), |
2015 | (numa_node_id >= 0) ? numa_node_id : | |
2016 | NUMA_NO_NODE); | |
2017 | ||
01c5f864 AD |
2018 | if (!dev_maps) |
2019 | goto out_no_maps; | |
2020 | ||
2021 | /* removes queue from unused CPUs */ | |
2022 | for_each_possible_cpu(cpu) { | |
2023 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) | |
2024 | continue; | |
2025 | ||
2026 | if (remove_xps_queue(dev_maps, cpu, index)) | |
2027 | active = true; | |
2028 | } | |
2029 | ||
2030 | /* free map if not active */ | |
2031 | if (!active) { | |
2032 | RCU_INIT_POINTER(dev->xps_maps, NULL); | |
2033 | kfree_rcu(dev_maps, rcu); | |
2034 | } | |
2035 | ||
2036 | out_no_maps: | |
537c00de AD |
2037 | mutex_unlock(&xps_map_mutex); |
2038 | ||
2039 | return 0; | |
2040 | error: | |
01c5f864 AD |
2041 | /* remove any maps that we added */ |
2042 | for_each_possible_cpu(cpu) { | |
2043 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
2044 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : | |
2045 | NULL; | |
2046 | if (new_map && new_map != map) | |
2047 | kfree(new_map); | |
2048 | } | |
2049 | ||
537c00de AD |
2050 | mutex_unlock(&xps_map_mutex); |
2051 | ||
537c00de AD |
2052 | kfree(new_dev_maps); |
2053 | return -ENOMEM; | |
2054 | } | |
2055 | EXPORT_SYMBOL(netif_set_xps_queue); | |
2056 | ||
2057 | #endif | |
f0796d5c JF |
2058 | /* |
2059 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
2060 | * greater then real_num_tx_queues stale skbs on the qdisc must be flushed. | |
2061 | */ | |
e6484930 | 2062 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2063 | { |
1d24eb48 TH |
2064 | int rc; |
2065 | ||
e6484930 TH |
2066 | if (txq < 1 || txq > dev->num_tx_queues) |
2067 | return -EINVAL; | |
f0796d5c | 2068 | |
5c56580b BH |
2069 | if (dev->reg_state == NETREG_REGISTERED || |
2070 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2071 | ASSERT_RTNL(); |
2072 | ||
1d24eb48 TH |
2073 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2074 | txq); | |
bf264145 TH |
2075 | if (rc) |
2076 | return rc; | |
2077 | ||
4f57c087 JF |
2078 | if (dev->num_tc) |
2079 | netif_setup_tc(dev, txq); | |
2080 | ||
024e9679 | 2081 | if (txq < dev->real_num_tx_queues) { |
e6484930 | 2082 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2083 | #ifdef CONFIG_XPS |
2084 | netif_reset_xps_queues_gt(dev, txq); | |
2085 | #endif | |
2086 | } | |
f0796d5c | 2087 | } |
e6484930 TH |
2088 | |
2089 | dev->real_num_tx_queues = txq; | |
2090 | return 0; | |
f0796d5c JF |
2091 | } |
2092 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2093 | |
a953be53 | 2094 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
2095 | /** |
2096 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2097 | * @dev: Network device | |
2098 | * @rxq: Actual number of RX queues | |
2099 | * | |
2100 | * This must be called either with the rtnl_lock held or before | |
2101 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2102 | * negative error code. If called before registration, it always |
2103 | * succeeds. | |
62fe0b40 BH |
2104 | */ |
2105 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2106 | { | |
2107 | int rc; | |
2108 | ||
bd25fa7b TH |
2109 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2110 | return -EINVAL; | |
2111 | ||
62fe0b40 BH |
2112 | if (dev->reg_state == NETREG_REGISTERED) { |
2113 | ASSERT_RTNL(); | |
2114 | ||
62fe0b40 BH |
2115 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2116 | rxq); | |
2117 | if (rc) | |
2118 | return rc; | |
62fe0b40 BH |
2119 | } |
2120 | ||
2121 | dev->real_num_rx_queues = rxq; | |
2122 | return 0; | |
2123 | } | |
2124 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2125 | #endif | |
2126 | ||
2c53040f BH |
2127 | /** |
2128 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
2129 | * |
2130 | * This routine should set an upper limit on the number of RSS queues | |
2131 | * used by default by multiqueue devices. | |
2132 | */ | |
a55b138b | 2133 | int netif_get_num_default_rss_queues(void) |
16917b87 YM |
2134 | { |
2135 | return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
2136 | } | |
2137 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
2138 | ||
def82a1d | 2139 | static inline void __netif_reschedule(struct Qdisc *q) |
56079431 | 2140 | { |
def82a1d JP |
2141 | struct softnet_data *sd; |
2142 | unsigned long flags; | |
56079431 | 2143 | |
def82a1d JP |
2144 | local_irq_save(flags); |
2145 | sd = &__get_cpu_var(softnet_data); | |
a9cbd588 CG |
2146 | q->next_sched = NULL; |
2147 | *sd->output_queue_tailp = q; | |
2148 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
2149 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
2150 | local_irq_restore(flags); | |
2151 | } | |
2152 | ||
2153 | void __netif_schedule(struct Qdisc *q) | |
2154 | { | |
2155 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
2156 | __netif_reschedule(q); | |
56079431 DV |
2157 | } |
2158 | EXPORT_SYMBOL(__netif_schedule); | |
2159 | ||
e6247027 ED |
2160 | struct dev_kfree_skb_cb { |
2161 | enum skb_free_reason reason; | |
2162 | }; | |
2163 | ||
2164 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 2165 | { |
e6247027 ED |
2166 | return (struct dev_kfree_skb_cb *)skb->cb; |
2167 | } | |
2168 | ||
2169 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) | |
56079431 | 2170 | { |
e6247027 | 2171 | unsigned long flags; |
56079431 | 2172 | |
e6247027 ED |
2173 | if (likely(atomic_read(&skb->users) == 1)) { |
2174 | smp_rmb(); | |
2175 | atomic_set(&skb->users, 0); | |
2176 | } else if (likely(!atomic_dec_and_test(&skb->users))) { | |
2177 | return; | |
bea3348e | 2178 | } |
e6247027 ED |
2179 | get_kfree_skb_cb(skb)->reason = reason; |
2180 | local_irq_save(flags); | |
2181 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
2182 | __this_cpu_write(softnet_data.completion_queue, skb); | |
2183 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
2184 | local_irq_restore(flags); | |
56079431 | 2185 | } |
e6247027 | 2186 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 2187 | |
e6247027 | 2188 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
2189 | { |
2190 | if (in_irq() || irqs_disabled()) | |
e6247027 | 2191 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
2192 | else |
2193 | dev_kfree_skb(skb); | |
2194 | } | |
e6247027 | 2195 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
2196 | |
2197 | ||
bea3348e SH |
2198 | /** |
2199 | * netif_device_detach - mark device as removed | |
2200 | * @dev: network device | |
2201 | * | |
2202 | * Mark device as removed from system and therefore no longer available. | |
2203 | */ | |
56079431 DV |
2204 | void netif_device_detach(struct net_device *dev) |
2205 | { | |
2206 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2207 | netif_running(dev)) { | |
d543103a | 2208 | netif_tx_stop_all_queues(dev); |
56079431 DV |
2209 | } |
2210 | } | |
2211 | EXPORT_SYMBOL(netif_device_detach); | |
2212 | ||
bea3348e SH |
2213 | /** |
2214 | * netif_device_attach - mark device as attached | |
2215 | * @dev: network device | |
2216 | * | |
2217 | * Mark device as attached from system and restart if needed. | |
2218 | */ | |
56079431 DV |
2219 | void netif_device_attach(struct net_device *dev) |
2220 | { | |
2221 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2222 | netif_running(dev)) { | |
d543103a | 2223 | netif_tx_wake_all_queues(dev); |
4ec93edb | 2224 | __netdev_watchdog_up(dev); |
56079431 DV |
2225 | } |
2226 | } | |
2227 | EXPORT_SYMBOL(netif_device_attach); | |
2228 | ||
36c92474 BH |
2229 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
2230 | { | |
65e9d2fa | 2231 | static const netdev_features_t null_features = 0; |
36c92474 BH |
2232 | struct net_device *dev = skb->dev; |
2233 | const char *driver = ""; | |
2234 | ||
c846ad9b BG |
2235 | if (!net_ratelimit()) |
2236 | return; | |
2237 | ||
36c92474 BH |
2238 | if (dev && dev->dev.parent) |
2239 | driver = dev_driver_string(dev->dev.parent); | |
2240 | ||
2241 | WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d " | |
2242 | "gso_type=%d ip_summed=%d\n", | |
65e9d2fa MM |
2243 | driver, dev ? &dev->features : &null_features, |
2244 | skb->sk ? &skb->sk->sk_route_caps : &null_features, | |
36c92474 BH |
2245 | skb->len, skb->data_len, skb_shinfo(skb)->gso_size, |
2246 | skb_shinfo(skb)->gso_type, skb->ip_summed); | |
2247 | } | |
2248 | ||
1da177e4 LT |
2249 | /* |
2250 | * Invalidate hardware checksum when packet is to be mangled, and | |
2251 | * complete checksum manually on outgoing path. | |
2252 | */ | |
84fa7933 | 2253 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 2254 | { |
d3bc23e7 | 2255 | __wsum csum; |
663ead3b | 2256 | int ret = 0, offset; |
1da177e4 | 2257 | |
84fa7933 | 2258 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
2259 | goto out_set_summed; |
2260 | ||
2261 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
36c92474 BH |
2262 | skb_warn_bad_offload(skb); |
2263 | return -EINVAL; | |
1da177e4 LT |
2264 | } |
2265 | ||
cef401de ED |
2266 | /* Before computing a checksum, we should make sure no frag could |
2267 | * be modified by an external entity : checksum could be wrong. | |
2268 | */ | |
2269 | if (skb_has_shared_frag(skb)) { | |
2270 | ret = __skb_linearize(skb); | |
2271 | if (ret) | |
2272 | goto out; | |
2273 | } | |
2274 | ||
55508d60 | 2275 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
2276 | BUG_ON(offset >= skb_headlen(skb)); |
2277 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
2278 | ||
2279 | offset += skb->csum_offset; | |
2280 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
2281 | ||
2282 | if (skb_cloned(skb) && | |
2283 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
2284 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
2285 | if (ret) | |
2286 | goto out; | |
2287 | } | |
2288 | ||
a030847e | 2289 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
a430a43d | 2290 | out_set_summed: |
1da177e4 | 2291 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 2292 | out: |
1da177e4 LT |
2293 | return ret; |
2294 | } | |
d1b19dff | 2295 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 2296 | |
53d6471c | 2297 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 2298 | { |
4b9b1cdf | 2299 | unsigned int vlan_depth = skb->mac_len; |
252e3346 | 2300 | __be16 type = skb->protocol; |
f6a78bfc | 2301 | |
19acc327 PS |
2302 | /* Tunnel gso handlers can set protocol to ethernet. */ |
2303 | if (type == htons(ETH_P_TEB)) { | |
2304 | struct ethhdr *eth; | |
2305 | ||
2306 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
2307 | return 0; | |
2308 | ||
2309 | eth = (struct ethhdr *)skb_mac_header(skb); | |
2310 | type = eth->h_proto; | |
2311 | } | |
2312 | ||
4b9b1cdf NA |
2313 | /* if skb->protocol is 802.1Q/AD then the header should already be |
2314 | * present at mac_len - VLAN_HLEN (if mac_len > 0), or at | |
2315 | * ETH_HLEN otherwise | |
2316 | */ | |
2317 | if (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) { | |
2318 | if (vlan_depth) { | |
2319 | if (unlikely(WARN_ON(vlan_depth < VLAN_HLEN))) | |
2320 | return 0; | |
2321 | vlan_depth -= VLAN_HLEN; | |
2322 | } else { | |
2323 | vlan_depth = ETH_HLEN; | |
2324 | } | |
2325 | do { | |
2326 | struct vlan_hdr *vh; | |
2327 | ||
2328 | if (unlikely(!pskb_may_pull(skb, | |
2329 | vlan_depth + VLAN_HLEN))) | |
2330 | return 0; | |
2331 | ||
2332 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); | |
2333 | type = vh->h_vlan_encapsulated_proto; | |
2334 | vlan_depth += VLAN_HLEN; | |
2335 | } while (type == htons(ETH_P_8021Q) || | |
2336 | type == htons(ETH_P_8021AD)); | |
7b9c6090 JG |
2337 | } |
2338 | ||
53d6471c VY |
2339 | *depth = vlan_depth; |
2340 | ||
ec5f0615 PS |
2341 | return type; |
2342 | } | |
2343 | ||
2344 | /** | |
2345 | * skb_mac_gso_segment - mac layer segmentation handler. | |
2346 | * @skb: buffer to segment | |
2347 | * @features: features for the output path (see dev->features) | |
2348 | */ | |
2349 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
2350 | netdev_features_t features) | |
2351 | { | |
2352 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
2353 | struct packet_offload *ptype; | |
53d6471c VY |
2354 | int vlan_depth = skb->mac_len; |
2355 | __be16 type = skb_network_protocol(skb, &vlan_depth); | |
ec5f0615 PS |
2356 | |
2357 | if (unlikely(!type)) | |
2358 | return ERR_PTR(-EINVAL); | |
2359 | ||
53d6471c | 2360 | __skb_pull(skb, vlan_depth); |
f6a78bfc HX |
2361 | |
2362 | rcu_read_lock(); | |
22061d80 | 2363 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 2364 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
84fa7933 | 2365 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
05e8ef4a PS |
2366 | int err; |
2367 | ||
f191a1d1 | 2368 | err = ptype->callbacks.gso_send_check(skb); |
a430a43d HX |
2369 | segs = ERR_PTR(err); |
2370 | if (err || skb_gso_ok(skb, features)) | |
2371 | break; | |
d56f90a7 ACM |
2372 | __skb_push(skb, (skb->data - |
2373 | skb_network_header(skb))); | |
a430a43d | 2374 | } |
f191a1d1 | 2375 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
2376 | break; |
2377 | } | |
2378 | } | |
2379 | rcu_read_unlock(); | |
2380 | ||
98e399f8 | 2381 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 2382 | |
f6a78bfc HX |
2383 | return segs; |
2384 | } | |
05e8ef4a PS |
2385 | EXPORT_SYMBOL(skb_mac_gso_segment); |
2386 | ||
2387 | ||
2388 | /* openvswitch calls this on rx path, so we need a different check. | |
2389 | */ | |
2390 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
2391 | { | |
2392 | if (tx_path) | |
2393 | return skb->ip_summed != CHECKSUM_PARTIAL; | |
2394 | else | |
2395 | return skb->ip_summed == CHECKSUM_NONE; | |
2396 | } | |
2397 | ||
2398 | /** | |
2399 | * __skb_gso_segment - Perform segmentation on skb. | |
2400 | * @skb: buffer to segment | |
2401 | * @features: features for the output path (see dev->features) | |
2402 | * @tx_path: whether it is called in TX path | |
2403 | * | |
2404 | * This function segments the given skb and returns a list of segments. | |
2405 | * | |
2406 | * It may return NULL if the skb requires no segmentation. This is | |
2407 | * only possible when GSO is used for verifying header integrity. | |
2408 | */ | |
2409 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
2410 | netdev_features_t features, bool tx_path) | |
2411 | { | |
2412 | if (unlikely(skb_needs_check(skb, tx_path))) { | |
2413 | int err; | |
2414 | ||
2415 | skb_warn_bad_offload(skb); | |
2416 | ||
2417 | if (skb_header_cloned(skb) && | |
2418 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
2419 | return ERR_PTR(err); | |
2420 | } | |
2421 | ||
68c33163 | 2422 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
2423 | SKB_GSO_CB(skb)->encap_level = 0; |
2424 | ||
05e8ef4a PS |
2425 | skb_reset_mac_header(skb); |
2426 | skb_reset_mac_len(skb); | |
2427 | ||
2428 | return skb_mac_gso_segment(skb, features); | |
2429 | } | |
12b0004d | 2430 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 2431 | |
fb286bb2 HX |
2432 | /* Take action when hardware reception checksum errors are detected. */ |
2433 | #ifdef CONFIG_BUG | |
2434 | void netdev_rx_csum_fault(struct net_device *dev) | |
2435 | { | |
2436 | if (net_ratelimit()) { | |
7b6cd1ce | 2437 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
2438 | dump_stack(); |
2439 | } | |
2440 | } | |
2441 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
2442 | #endif | |
2443 | ||
1da177e4 LT |
2444 | /* Actually, we should eliminate this check as soon as we know, that: |
2445 | * 1. IOMMU is present and allows to map all the memory. | |
2446 | * 2. No high memory really exists on this machine. | |
2447 | */ | |
2448 | ||
c1e756bf | 2449 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 2450 | { |
3d3a8533 | 2451 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 2452 | int i; |
5acbbd42 | 2453 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
2454 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
2455 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
2456 | if (PageHighMem(skb_frag_page(frag))) | |
5acbbd42 | 2457 | return 1; |
ea2ab693 | 2458 | } |
5acbbd42 | 2459 | } |
1da177e4 | 2460 | |
5acbbd42 FT |
2461 | if (PCI_DMA_BUS_IS_PHYS) { |
2462 | struct device *pdev = dev->dev.parent; | |
1da177e4 | 2463 | |
9092c658 ED |
2464 | if (!pdev) |
2465 | return 0; | |
5acbbd42 | 2466 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
ea2ab693 IC |
2467 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
2468 | dma_addr_t addr = page_to_phys(skb_frag_page(frag)); | |
5acbbd42 FT |
2469 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
2470 | return 1; | |
2471 | } | |
2472 | } | |
3d3a8533 | 2473 | #endif |
1da177e4 LT |
2474 | return 0; |
2475 | } | |
1da177e4 | 2476 | |
f6a78bfc HX |
2477 | struct dev_gso_cb { |
2478 | void (*destructor)(struct sk_buff *skb); | |
2479 | }; | |
2480 | ||
2481 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) | |
2482 | ||
2483 | static void dev_gso_skb_destructor(struct sk_buff *skb) | |
2484 | { | |
2485 | struct dev_gso_cb *cb; | |
2486 | ||
289dccbe ED |
2487 | kfree_skb_list(skb->next); |
2488 | skb->next = NULL; | |
f6a78bfc HX |
2489 | |
2490 | cb = DEV_GSO_CB(skb); | |
2491 | if (cb->destructor) | |
2492 | cb->destructor(skb); | |
2493 | } | |
2494 | ||
2495 | /** | |
2496 | * dev_gso_segment - Perform emulated hardware segmentation on skb. | |
2497 | * @skb: buffer to segment | |
91ecb63c | 2498 | * @features: device features as applicable to this skb |
f6a78bfc HX |
2499 | * |
2500 | * This function segments the given skb and stores the list of segments | |
2501 | * in skb->next. | |
2502 | */ | |
c8f44aff | 2503 | static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features) |
f6a78bfc | 2504 | { |
f6a78bfc | 2505 | struct sk_buff *segs; |
576a30eb HX |
2506 | |
2507 | segs = skb_gso_segment(skb, features); | |
2508 | ||
2509 | /* Verifying header integrity only. */ | |
2510 | if (!segs) | |
2511 | return 0; | |
f6a78bfc | 2512 | |
801678c5 | 2513 | if (IS_ERR(segs)) |
f6a78bfc HX |
2514 | return PTR_ERR(segs); |
2515 | ||
2516 | skb->next = segs; | |
2517 | DEV_GSO_CB(skb)->destructor = skb->destructor; | |
2518 | skb->destructor = dev_gso_skb_destructor; | |
2519 | ||
2520 | return 0; | |
2521 | } | |
2522 | ||
3b392ddb SH |
2523 | /* If MPLS offload request, verify we are testing hardware MPLS features |
2524 | * instead of standard features for the netdev. | |
2525 | */ | |
2526 | #ifdef CONFIG_NET_MPLS_GSO | |
2527 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
2528 | netdev_features_t features, | |
2529 | __be16 type) | |
2530 | { | |
2531 | if (type == htons(ETH_P_MPLS_UC) || type == htons(ETH_P_MPLS_MC)) | |
2532 | features &= skb->dev->mpls_features; | |
2533 | ||
2534 | return features; | |
2535 | } | |
2536 | #else | |
2537 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
2538 | netdev_features_t features, | |
2539 | __be16 type) | |
2540 | { | |
2541 | return features; | |
2542 | } | |
2543 | #endif | |
2544 | ||
c8f44aff | 2545 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 2546 | netdev_features_t features) |
f01a5236 | 2547 | { |
53d6471c | 2548 | int tmp; |
3b392ddb SH |
2549 | __be16 type; |
2550 | ||
2551 | type = skb_network_protocol(skb, &tmp); | |
2552 | features = net_mpls_features(skb, features, type); | |
53d6471c | 2553 | |
c0d680e5 | 2554 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 2555 | !can_checksum_protocol(features, type)) { |
f01a5236 | 2556 | features &= ~NETIF_F_ALL_CSUM; |
c1e756bf | 2557 | } else if (illegal_highdma(skb->dev, skb)) { |
f01a5236 JG |
2558 | features &= ~NETIF_F_SG; |
2559 | } | |
2560 | ||
2561 | return features; | |
2562 | } | |
2563 | ||
c1e756bf | 2564 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 JG |
2565 | { |
2566 | __be16 protocol = skb->protocol; | |
c1e756bf | 2567 | netdev_features_t features = skb->dev->features; |
58e998c6 | 2568 | |
c1e756bf | 2569 | if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs) |
30b678d8 BH |
2570 | features &= ~NETIF_F_GSO_MASK; |
2571 | ||
8ad227ff | 2572 | if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) { |
58e998c6 JG |
2573 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
2574 | protocol = veh->h_vlan_encapsulated_proto; | |
f01a5236 | 2575 | } else if (!vlan_tx_tag_present(skb)) { |
c1e756bf | 2576 | return harmonize_features(skb, features); |
f01a5236 | 2577 | } |
58e998c6 | 2578 | |
c1e756bf | 2579 | features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX | |
8ad227ff | 2580 | NETIF_F_HW_VLAN_STAG_TX); |
f01a5236 | 2581 | |
cdbaa0bb | 2582 | if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) |
f01a5236 | 2583 | features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | |
8ad227ff PM |
2584 | NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX | |
2585 | NETIF_F_HW_VLAN_STAG_TX; | |
cdbaa0bb | 2586 | |
c1e756bf | 2587 | return harmonize_features(skb, features); |
58e998c6 | 2588 | } |
c1e756bf | 2589 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 2590 | |
fd2ea0a7 | 2591 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
f663dd9a | 2592 | struct netdev_queue *txq) |
f6a78bfc | 2593 | { |
00829823 | 2594 | const struct net_device_ops *ops = dev->netdev_ops; |
572a9d7b | 2595 | int rc = NETDEV_TX_OK; |
ec764bf0 | 2596 | unsigned int skb_len; |
00829823 | 2597 | |
f6a78bfc | 2598 | if (likely(!skb->next)) { |
c8f44aff | 2599 | netdev_features_t features; |
fc741216 | 2600 | |
93f154b5 | 2601 | /* |
25985edc | 2602 | * If device doesn't need skb->dst, release it right now while |
93f154b5 ED |
2603 | * its hot in this cpu cache |
2604 | */ | |
adf30907 ED |
2605 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
2606 | skb_dst_drop(skb); | |
2607 | ||
fc741216 JG |
2608 | features = netif_skb_features(skb); |
2609 | ||
7b9c6090 | 2610 | if (vlan_tx_tag_present(skb) && |
86a9bad3 PM |
2611 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { |
2612 | skb = __vlan_put_tag(skb, skb->vlan_proto, | |
2613 | vlan_tx_tag_get(skb)); | |
7b9c6090 JG |
2614 | if (unlikely(!skb)) |
2615 | goto out; | |
2616 | ||
2617 | skb->vlan_tci = 0; | |
2618 | } | |
2619 | ||
fc70fb64 AD |
2620 | /* If encapsulation offload request, verify we are testing |
2621 | * hardware encapsulation features instead of standard | |
2622 | * features for the netdev | |
2623 | */ | |
2624 | if (skb->encapsulation) | |
2625 | features &= dev->hw_enc_features; | |
2626 | ||
fc741216 | 2627 | if (netif_needs_gso(skb, features)) { |
91ecb63c | 2628 | if (unlikely(dev_gso_segment(skb, features))) |
9ccb8975 DM |
2629 | goto out_kfree_skb; |
2630 | if (skb->next) | |
2631 | goto gso; | |
6afff0ca | 2632 | } else { |
02932ce9 | 2633 | if (skb_needs_linearize(skb, features) && |
6afff0ca JF |
2634 | __skb_linearize(skb)) |
2635 | goto out_kfree_skb; | |
2636 | ||
2637 | /* If packet is not checksummed and device does not | |
2638 | * support checksumming for this protocol, complete | |
2639 | * checksumming here. | |
2640 | */ | |
2641 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
fc70fb64 AD |
2642 | if (skb->encapsulation) |
2643 | skb_set_inner_transport_header(skb, | |
2644 | skb_checksum_start_offset(skb)); | |
2645 | else | |
2646 | skb_set_transport_header(skb, | |
2647 | skb_checksum_start_offset(skb)); | |
03634668 | 2648 | if (!(features & NETIF_F_ALL_CSUM) && |
6afff0ca JF |
2649 | skb_checksum_help(skb)) |
2650 | goto out_kfree_skb; | |
2651 | } | |
9ccb8975 DM |
2652 | } |
2653 | ||
b40863c6 ED |
2654 | if (!list_empty(&ptype_all)) |
2655 | dev_queue_xmit_nit(skb, dev); | |
2656 | ||
ec764bf0 | 2657 | skb_len = skb->len; |
d87d04a7 | 2658 | trace_net_dev_start_xmit(skb, dev); |
20567661 | 2659 | rc = ops->ndo_start_xmit(skb, dev); |
ec764bf0 | 2660 | trace_net_dev_xmit(skb, rc, dev, skb_len); |
f663dd9a | 2661 | if (rc == NETDEV_TX_OK) |
08baf561 | 2662 | txq_trans_update(txq); |
ac45f602 | 2663 | return rc; |
f6a78bfc HX |
2664 | } |
2665 | ||
576a30eb | 2666 | gso: |
f6a78bfc HX |
2667 | do { |
2668 | struct sk_buff *nskb = skb->next; | |
f6a78bfc HX |
2669 | |
2670 | skb->next = nskb->next; | |
2671 | nskb->next = NULL; | |
068a2de5 | 2672 | |
b40863c6 ED |
2673 | if (!list_empty(&ptype_all)) |
2674 | dev_queue_xmit_nit(nskb, dev); | |
2675 | ||
ec764bf0 | 2676 | skb_len = nskb->len; |
d87d04a7 | 2677 | trace_net_dev_start_xmit(nskb, dev); |
f663dd9a | 2678 | rc = ops->ndo_start_xmit(nskb, dev); |
ec764bf0 | 2679 | trace_net_dev_xmit(nskb, rc, dev, skb_len); |
ec634fe3 | 2680 | if (unlikely(rc != NETDEV_TX_OK)) { |
572a9d7b PM |
2681 | if (rc & ~NETDEV_TX_MASK) |
2682 | goto out_kfree_gso_skb; | |
f54d9e8d | 2683 | nskb->next = skb->next; |
f6a78bfc HX |
2684 | skb->next = nskb; |
2685 | return rc; | |
2686 | } | |
08baf561 | 2687 | txq_trans_update(txq); |
73466498 | 2688 | if (unlikely(netif_xmit_stopped(txq) && skb->next)) |
f54d9e8d | 2689 | return NETDEV_TX_BUSY; |
f6a78bfc | 2690 | } while (skb->next); |
4ec93edb | 2691 | |
572a9d7b | 2692 | out_kfree_gso_skb: |
0c772159 | 2693 | if (likely(skb->next == NULL)) { |
572a9d7b | 2694 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
0c772159 SS |
2695 | consume_skb(skb); |
2696 | return rc; | |
2697 | } | |
f6a78bfc HX |
2698 | out_kfree_skb: |
2699 | kfree_skb(skb); | |
7b9c6090 | 2700 | out: |
572a9d7b | 2701 | return rc; |
f6a78bfc | 2702 | } |
a6cc0cfa | 2703 | EXPORT_SYMBOL_GPL(dev_hard_start_xmit); |
f6a78bfc | 2704 | |
1def9238 ED |
2705 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
2706 | { | |
2707 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
2708 | ||
2709 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
2710 | ||
2711 | /* To get more precise estimation of bytes sent on wire, | |
2712 | * we add to pkt_len the headers size of all segments | |
2713 | */ | |
2714 | if (shinfo->gso_size) { | |
757b8b1d | 2715 | unsigned int hdr_len; |
15e5a030 | 2716 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 2717 | |
757b8b1d ED |
2718 | /* mac layer + network layer */ |
2719 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
2720 | ||
2721 | /* + transport layer */ | |
1def9238 ED |
2722 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) |
2723 | hdr_len += tcp_hdrlen(skb); | |
2724 | else | |
2725 | hdr_len += sizeof(struct udphdr); | |
15e5a030 JW |
2726 | |
2727 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
2728 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
2729 | shinfo->gso_size); | |
2730 | ||
2731 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
2732 | } |
2733 | } | |
2734 | ||
bbd8a0d3 KK |
2735 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
2736 | struct net_device *dev, | |
2737 | struct netdev_queue *txq) | |
2738 | { | |
2739 | spinlock_t *root_lock = qdisc_lock(q); | |
a2da570d | 2740 | bool contended; |
bbd8a0d3 KK |
2741 | int rc; |
2742 | ||
1def9238 | 2743 | qdisc_pkt_len_init(skb); |
a2da570d | 2744 | qdisc_calculate_pkt_len(skb, q); |
79640a4c ED |
2745 | /* |
2746 | * Heuristic to force contended enqueues to serialize on a | |
2747 | * separate lock before trying to get qdisc main lock. | |
2748 | * This permits __QDISC_STATE_RUNNING owner to get the lock more often | |
2749 | * and dequeue packets faster. | |
2750 | */ | |
a2da570d | 2751 | contended = qdisc_is_running(q); |
79640a4c ED |
2752 | if (unlikely(contended)) |
2753 | spin_lock(&q->busylock); | |
2754 | ||
bbd8a0d3 KK |
2755 | spin_lock(root_lock); |
2756 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
2757 | kfree_skb(skb); | |
2758 | rc = NET_XMIT_DROP; | |
2759 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 2760 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
2761 | /* |
2762 | * This is a work-conserving queue; there are no old skbs | |
2763 | * waiting to be sent out; and the qdisc is not running - | |
2764 | * xmit the skb directly. | |
2765 | */ | |
7fee226a ED |
2766 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE)) |
2767 | skb_dst_force(skb); | |
bfe0d029 | 2768 | |
bfe0d029 ED |
2769 | qdisc_bstats_update(q, skb); |
2770 | ||
79640a4c ED |
2771 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) { |
2772 | if (unlikely(contended)) { | |
2773 | spin_unlock(&q->busylock); | |
2774 | contended = false; | |
2775 | } | |
bbd8a0d3 | 2776 | __qdisc_run(q); |
79640a4c | 2777 | } else |
bc135b23 | 2778 | qdisc_run_end(q); |
bbd8a0d3 KK |
2779 | |
2780 | rc = NET_XMIT_SUCCESS; | |
2781 | } else { | |
7fee226a | 2782 | skb_dst_force(skb); |
a2da570d | 2783 | rc = q->enqueue(skb, q) & NET_XMIT_MASK; |
79640a4c ED |
2784 | if (qdisc_run_begin(q)) { |
2785 | if (unlikely(contended)) { | |
2786 | spin_unlock(&q->busylock); | |
2787 | contended = false; | |
2788 | } | |
2789 | __qdisc_run(q); | |
2790 | } | |
bbd8a0d3 KK |
2791 | } |
2792 | spin_unlock(root_lock); | |
79640a4c ED |
2793 | if (unlikely(contended)) |
2794 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
2795 | return rc; |
2796 | } | |
2797 | ||
86f8515f | 2798 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
2799 | static void skb_update_prio(struct sk_buff *skb) |
2800 | { | |
6977a79d | 2801 | struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap); |
5bc1421e | 2802 | |
91c68ce2 ED |
2803 | if (!skb->priority && skb->sk && map) { |
2804 | unsigned int prioidx = skb->sk->sk_cgrp_prioidx; | |
2805 | ||
2806 | if (prioidx < map->priomap_len) | |
2807 | skb->priority = map->priomap[prioidx]; | |
2808 | } | |
5bc1421e NH |
2809 | } |
2810 | #else | |
2811 | #define skb_update_prio(skb) | |
2812 | #endif | |
2813 | ||
745e20f1 | 2814 | static DEFINE_PER_CPU(int, xmit_recursion); |
11a766ce | 2815 | #define RECURSION_LIMIT 10 |
745e20f1 | 2816 | |
95603e22 MM |
2817 | /** |
2818 | * dev_loopback_xmit - loop back @skb | |
2819 | * @skb: buffer to transmit | |
2820 | */ | |
2821 | int dev_loopback_xmit(struct sk_buff *skb) | |
2822 | { | |
2823 | skb_reset_mac_header(skb); | |
2824 | __skb_pull(skb, skb_network_offset(skb)); | |
2825 | skb->pkt_type = PACKET_LOOPBACK; | |
2826 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2827 | WARN_ON(!skb_dst(skb)); | |
2828 | skb_dst_force(skb); | |
2829 | netif_rx_ni(skb); | |
2830 | return 0; | |
2831 | } | |
2832 | EXPORT_SYMBOL(dev_loopback_xmit); | |
2833 | ||
d29f749e | 2834 | /** |
9d08dd3d | 2835 | * __dev_queue_xmit - transmit a buffer |
d29f749e | 2836 | * @skb: buffer to transmit |
9d08dd3d | 2837 | * @accel_priv: private data used for L2 forwarding offload |
d29f749e DJ |
2838 | * |
2839 | * Queue a buffer for transmission to a network device. The caller must | |
2840 | * have set the device and priority and built the buffer before calling | |
2841 | * this function. The function can be called from an interrupt. | |
2842 | * | |
2843 | * A negative errno code is returned on a failure. A success does not | |
2844 | * guarantee the frame will be transmitted as it may be dropped due | |
2845 | * to congestion or traffic shaping. | |
2846 | * | |
2847 | * ----------------------------------------------------------------------------------- | |
2848 | * I notice this method can also return errors from the queue disciplines, | |
2849 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
2850 | * be positive. | |
2851 | * | |
2852 | * Regardless of the return value, the skb is consumed, so it is currently | |
2853 | * difficult to retry a send to this method. (You can bump the ref count | |
2854 | * before sending to hold a reference for retry if you are careful.) | |
2855 | * | |
2856 | * When calling this method, interrupts MUST be enabled. This is because | |
2857 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
2858 | * --BLG | |
2859 | */ | |
0a59f3a9 | 2860 | static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) |
1da177e4 LT |
2861 | { |
2862 | struct net_device *dev = skb->dev; | |
dc2b4847 | 2863 | struct netdev_queue *txq; |
1da177e4 LT |
2864 | struct Qdisc *q; |
2865 | int rc = -ENOMEM; | |
2866 | ||
6d1ccff6 ED |
2867 | skb_reset_mac_header(skb); |
2868 | ||
4ec93edb YH |
2869 | /* Disable soft irqs for various locks below. Also |
2870 | * stops preemption for RCU. | |
1da177e4 | 2871 | */ |
4ec93edb | 2872 | rcu_read_lock_bh(); |
1da177e4 | 2873 | |
5bc1421e NH |
2874 | skb_update_prio(skb); |
2875 | ||
f663dd9a | 2876 | txq = netdev_pick_tx(dev, skb, accel_priv); |
a898def2 | 2877 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 2878 | |
1da177e4 | 2879 | #ifdef CONFIG_NET_CLS_ACT |
d1b19dff | 2880 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
1da177e4 | 2881 | #endif |
cf66ba58 | 2882 | trace_net_dev_queue(skb); |
1da177e4 | 2883 | if (q->enqueue) { |
bbd8a0d3 | 2884 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 2885 | goto out; |
1da177e4 LT |
2886 | } |
2887 | ||
2888 | /* The device has no queue. Common case for software devices: | |
2889 | loopback, all the sorts of tunnels... | |
2890 | ||
932ff279 HX |
2891 | Really, it is unlikely that netif_tx_lock protection is necessary |
2892 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
2893 | counters.) |
2894 | However, it is possible, that they rely on protection | |
2895 | made by us here. | |
2896 | ||
2897 | Check this and shot the lock. It is not prone from deadlocks. | |
2898 | Either shot noqueue qdisc, it is even simpler 8) | |
2899 | */ | |
2900 | if (dev->flags & IFF_UP) { | |
2901 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
2902 | ||
c773e847 | 2903 | if (txq->xmit_lock_owner != cpu) { |
1da177e4 | 2904 | |
745e20f1 ED |
2905 | if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT) |
2906 | goto recursion_alert; | |
2907 | ||
c773e847 | 2908 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 2909 | |
73466498 | 2910 | if (!netif_xmit_stopped(txq)) { |
745e20f1 | 2911 | __this_cpu_inc(xmit_recursion); |
f663dd9a | 2912 | rc = dev_hard_start_xmit(skb, dev, txq); |
745e20f1 | 2913 | __this_cpu_dec(xmit_recursion); |
572a9d7b | 2914 | if (dev_xmit_complete(rc)) { |
c773e847 | 2915 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
2916 | goto out; |
2917 | } | |
2918 | } | |
c773e847 | 2919 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
2920 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
2921 | dev->name); | |
1da177e4 LT |
2922 | } else { |
2923 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
2924 | * unfortunately |
2925 | */ | |
2926 | recursion_alert: | |
e87cc472 JP |
2927 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
2928 | dev->name); | |
1da177e4 LT |
2929 | } |
2930 | } | |
2931 | ||
2932 | rc = -ENETDOWN; | |
d4828d85 | 2933 | rcu_read_unlock_bh(); |
1da177e4 | 2934 | |
015f0688 | 2935 | atomic_long_inc(&dev->tx_dropped); |
1da177e4 LT |
2936 | kfree_skb(skb); |
2937 | return rc; | |
2938 | out: | |
d4828d85 | 2939 | rcu_read_unlock_bh(); |
1da177e4 LT |
2940 | return rc; |
2941 | } | |
f663dd9a JW |
2942 | |
2943 | int dev_queue_xmit(struct sk_buff *skb) | |
2944 | { | |
2945 | return __dev_queue_xmit(skb, NULL); | |
2946 | } | |
d1b19dff | 2947 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 | 2948 | |
f663dd9a JW |
2949 | int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv) |
2950 | { | |
2951 | return __dev_queue_xmit(skb, accel_priv); | |
2952 | } | |
2953 | EXPORT_SYMBOL(dev_queue_xmit_accel); | |
2954 | ||
1da177e4 LT |
2955 | |
2956 | /*======================================================================= | |
2957 | Receiver routines | |
2958 | =======================================================================*/ | |
2959 | ||
6b2bedc3 | 2960 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
2961 | EXPORT_SYMBOL(netdev_max_backlog); |
2962 | ||
3b098e2d | 2963 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 SH |
2964 | int netdev_budget __read_mostly = 300; |
2965 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 | 2966 | |
eecfd7c4 ED |
2967 | /* Called with irq disabled */ |
2968 | static inline void ____napi_schedule(struct softnet_data *sd, | |
2969 | struct napi_struct *napi) | |
2970 | { | |
2971 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
2972 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2973 | } | |
2974 | ||
bfb564e7 KK |
2975 | #ifdef CONFIG_RPS |
2976 | ||
2977 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 2978 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 KK |
2979 | EXPORT_SYMBOL(rps_sock_flow_table); |
2980 | ||
c5905afb | 2981 | struct static_key rps_needed __read_mostly; |
adc9300e | 2982 | |
c445477d BH |
2983 | static struct rps_dev_flow * |
2984 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
2985 | struct rps_dev_flow *rflow, u16 next_cpu) | |
2986 | { | |
09994d1b | 2987 | if (next_cpu != RPS_NO_CPU) { |
c445477d BH |
2988 | #ifdef CONFIG_RFS_ACCEL |
2989 | struct netdev_rx_queue *rxqueue; | |
2990 | struct rps_dev_flow_table *flow_table; | |
2991 | struct rps_dev_flow *old_rflow; | |
2992 | u32 flow_id; | |
2993 | u16 rxq_index; | |
2994 | int rc; | |
2995 | ||
2996 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
2997 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
2998 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
2999 | goto out; |
3000 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
3001 | if (rxq_index == skb_get_rx_queue(skb)) | |
3002 | goto out; | |
3003 | ||
3004 | rxqueue = dev->_rx + rxq_index; | |
3005 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3006 | if (!flow_table) | |
3007 | goto out; | |
61b905da | 3008 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
3009 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
3010 | rxq_index, flow_id); | |
3011 | if (rc < 0) | |
3012 | goto out; | |
3013 | old_rflow = rflow; | |
3014 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
3015 | rflow->filter = rc; |
3016 | if (old_rflow->filter == rflow->filter) | |
3017 | old_rflow->filter = RPS_NO_FILTER; | |
3018 | out: | |
3019 | #endif | |
3020 | rflow->last_qtail = | |
09994d1b | 3021 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
3022 | } |
3023 | ||
09994d1b | 3024 | rflow->cpu = next_cpu; |
c445477d BH |
3025 | return rflow; |
3026 | } | |
3027 | ||
bfb564e7 KK |
3028 | /* |
3029 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
3030 | * CPU from the RPS map of the receiving queue for a given skb. | |
3031 | * rcu_read_lock must be held on entry. | |
3032 | */ | |
3033 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3034 | struct rps_dev_flow **rflowp) | |
3035 | { | |
3036 | struct netdev_rx_queue *rxqueue; | |
6e3f7faf | 3037 | struct rps_map *map; |
bfb564e7 KK |
3038 | struct rps_dev_flow_table *flow_table; |
3039 | struct rps_sock_flow_table *sock_flow_table; | |
3040 | int cpu = -1; | |
3041 | u16 tcpu; | |
61b905da | 3042 | u32 hash; |
bfb564e7 KK |
3043 | |
3044 | if (skb_rx_queue_recorded(skb)) { | |
3045 | u16 index = skb_get_rx_queue(skb); | |
62fe0b40 BH |
3046 | if (unlikely(index >= dev->real_num_rx_queues)) { |
3047 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
3048 | "%s received packet on queue %u, but number " | |
3049 | "of RX queues is %u\n", | |
3050 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
3051 | goto done; |
3052 | } | |
3053 | rxqueue = dev->_rx + index; | |
3054 | } else | |
3055 | rxqueue = dev->_rx; | |
3056 | ||
6e3f7faf ED |
3057 | map = rcu_dereference(rxqueue->rps_map); |
3058 | if (map) { | |
85875236 | 3059 | if (map->len == 1 && |
33d480ce | 3060 | !rcu_access_pointer(rxqueue->rps_flow_table)) { |
6febfca9 CG |
3061 | tcpu = map->cpus[0]; |
3062 | if (cpu_online(tcpu)) | |
3063 | cpu = tcpu; | |
3064 | goto done; | |
3065 | } | |
33d480ce | 3066 | } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) { |
bfb564e7 | 3067 | goto done; |
6febfca9 | 3068 | } |
bfb564e7 | 3069 | |
2d47b459 | 3070 | skb_reset_network_header(skb); |
61b905da TH |
3071 | hash = skb_get_hash(skb); |
3072 | if (!hash) | |
bfb564e7 KK |
3073 | goto done; |
3074 | ||
fec5e652 TH |
3075 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
3076 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
3077 | if (flow_table && sock_flow_table) { | |
3078 | u16 next_cpu; | |
3079 | struct rps_dev_flow *rflow; | |
3080 | ||
61b905da | 3081 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
3082 | tcpu = rflow->cpu; |
3083 | ||
61b905da | 3084 | next_cpu = sock_flow_table->ents[hash & sock_flow_table->mask]; |
fec5e652 TH |
3085 | |
3086 | /* | |
3087 | * If the desired CPU (where last recvmsg was done) is | |
3088 | * different from current CPU (one in the rx-queue flow | |
3089 | * table entry), switch if one of the following holds: | |
3090 | * - Current CPU is unset (equal to RPS_NO_CPU). | |
3091 | * - Current CPU is offline. | |
3092 | * - The current CPU's queue tail has advanced beyond the | |
3093 | * last packet that was enqueued using this table entry. | |
3094 | * This guarantees that all previous packets for the flow | |
3095 | * have been dequeued, thus preserving in order delivery. | |
3096 | */ | |
3097 | if (unlikely(tcpu != next_cpu) && | |
3098 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || | |
3099 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - | |
baefa31d TH |
3100 | rflow->last_qtail)) >= 0)) { |
3101 | tcpu = next_cpu; | |
c445477d | 3102 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 3103 | } |
c445477d | 3104 | |
fec5e652 TH |
3105 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
3106 | *rflowp = rflow; | |
3107 | cpu = tcpu; | |
3108 | goto done; | |
3109 | } | |
3110 | } | |
3111 | ||
0a9627f2 | 3112 | if (map) { |
61b905da | 3113 | tcpu = map->cpus[((u64) hash * map->len) >> 32]; |
0a9627f2 TH |
3114 | |
3115 | if (cpu_online(tcpu)) { | |
3116 | cpu = tcpu; | |
3117 | goto done; | |
3118 | } | |
3119 | } | |
3120 | ||
3121 | done: | |
0a9627f2 TH |
3122 | return cpu; |
3123 | } | |
3124 | ||
c445477d BH |
3125 | #ifdef CONFIG_RFS_ACCEL |
3126 | ||
3127 | /** | |
3128 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
3129 | * @dev: Device on which the filter was set | |
3130 | * @rxq_index: RX queue index | |
3131 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
3132 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
3133 | * | |
3134 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
3135 | * this function for each installed filter and remove the filters for | |
3136 | * which it returns %true. | |
3137 | */ | |
3138 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
3139 | u32 flow_id, u16 filter_id) | |
3140 | { | |
3141 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
3142 | struct rps_dev_flow_table *flow_table; | |
3143 | struct rps_dev_flow *rflow; | |
3144 | bool expire = true; | |
3145 | int cpu; | |
3146 | ||
3147 | rcu_read_lock(); | |
3148 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3149 | if (flow_table && flow_id <= flow_table->mask) { | |
3150 | rflow = &flow_table->flows[flow_id]; | |
3151 | cpu = ACCESS_ONCE(rflow->cpu); | |
3152 | if (rflow->filter == filter_id && cpu != RPS_NO_CPU && | |
3153 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - | |
3154 | rflow->last_qtail) < | |
3155 | (int)(10 * flow_table->mask))) | |
3156 | expire = false; | |
3157 | } | |
3158 | rcu_read_unlock(); | |
3159 | return expire; | |
3160 | } | |
3161 | EXPORT_SYMBOL(rps_may_expire_flow); | |
3162 | ||
3163 | #endif /* CONFIG_RFS_ACCEL */ | |
3164 | ||
0a9627f2 | 3165 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 3166 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 3167 | { |
e36fa2f7 ED |
3168 | struct softnet_data *sd = data; |
3169 | ||
eecfd7c4 | 3170 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 3171 | sd->received_rps++; |
0a9627f2 | 3172 | } |
e36fa2f7 | 3173 | |
fec5e652 | 3174 | #endif /* CONFIG_RPS */ |
0a9627f2 | 3175 | |
e36fa2f7 ED |
3176 | /* |
3177 | * Check if this softnet_data structure is another cpu one | |
3178 | * If yes, queue it to our IPI list and return 1 | |
3179 | * If no, return 0 | |
3180 | */ | |
3181 | static int rps_ipi_queued(struct softnet_data *sd) | |
3182 | { | |
3183 | #ifdef CONFIG_RPS | |
3184 | struct softnet_data *mysd = &__get_cpu_var(softnet_data); | |
3185 | ||
3186 | if (sd != mysd) { | |
3187 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
3188 | mysd->rps_ipi_list = sd; | |
3189 | ||
3190 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3191 | return 1; | |
3192 | } | |
3193 | #endif /* CONFIG_RPS */ | |
3194 | return 0; | |
3195 | } | |
3196 | ||
99bbc707 WB |
3197 | #ifdef CONFIG_NET_FLOW_LIMIT |
3198 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
3199 | #endif | |
3200 | ||
3201 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
3202 | { | |
3203 | #ifdef CONFIG_NET_FLOW_LIMIT | |
3204 | struct sd_flow_limit *fl; | |
3205 | struct softnet_data *sd; | |
3206 | unsigned int old_flow, new_flow; | |
3207 | ||
3208 | if (qlen < (netdev_max_backlog >> 1)) | |
3209 | return false; | |
3210 | ||
3211 | sd = &__get_cpu_var(softnet_data); | |
3212 | ||
3213 | rcu_read_lock(); | |
3214 | fl = rcu_dereference(sd->flow_limit); | |
3215 | if (fl) { | |
3958afa1 | 3216 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
3217 | old_flow = fl->history[fl->history_head]; |
3218 | fl->history[fl->history_head] = new_flow; | |
3219 | ||
3220 | fl->history_head++; | |
3221 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
3222 | ||
3223 | if (likely(fl->buckets[old_flow])) | |
3224 | fl->buckets[old_flow]--; | |
3225 | ||
3226 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
3227 | fl->count++; | |
3228 | rcu_read_unlock(); | |
3229 | return true; | |
3230 | } | |
3231 | } | |
3232 | rcu_read_unlock(); | |
3233 | #endif | |
3234 | return false; | |
3235 | } | |
3236 | ||
0a9627f2 TH |
3237 | /* |
3238 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
3239 | * queue (may be a remote CPU queue). | |
3240 | */ | |
fec5e652 TH |
3241 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
3242 | unsigned int *qtail) | |
0a9627f2 | 3243 | { |
e36fa2f7 | 3244 | struct softnet_data *sd; |
0a9627f2 | 3245 | unsigned long flags; |
99bbc707 | 3246 | unsigned int qlen; |
0a9627f2 | 3247 | |
e36fa2f7 | 3248 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
3249 | |
3250 | local_irq_save(flags); | |
0a9627f2 | 3251 | |
e36fa2f7 | 3252 | rps_lock(sd); |
99bbc707 WB |
3253 | qlen = skb_queue_len(&sd->input_pkt_queue); |
3254 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
6e7676c1 | 3255 | if (skb_queue_len(&sd->input_pkt_queue)) { |
0a9627f2 | 3256 | enqueue: |
e36fa2f7 | 3257 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 3258 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 3259 | rps_unlock(sd); |
152102c7 | 3260 | local_irq_restore(flags); |
0a9627f2 TH |
3261 | return NET_RX_SUCCESS; |
3262 | } | |
3263 | ||
ebda37c2 ED |
3264 | /* Schedule NAPI for backlog device |
3265 | * We can use non atomic operation since we own the queue lock | |
3266 | */ | |
3267 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 3268 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 3269 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
3270 | } |
3271 | goto enqueue; | |
3272 | } | |
3273 | ||
dee42870 | 3274 | sd->dropped++; |
e36fa2f7 | 3275 | rps_unlock(sd); |
0a9627f2 | 3276 | |
0a9627f2 TH |
3277 | local_irq_restore(flags); |
3278 | ||
caf586e5 | 3279 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
3280 | kfree_skb(skb); |
3281 | return NET_RX_DROP; | |
3282 | } | |
1da177e4 | 3283 | |
ae78dbfa | 3284 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 3285 | { |
b0e28f1e | 3286 | int ret; |
1da177e4 | 3287 | |
588f0330 | 3288 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 3289 | |
cf66ba58 | 3290 | trace_netif_rx(skb); |
df334545 | 3291 | #ifdef CONFIG_RPS |
c5905afb | 3292 | if (static_key_false(&rps_needed)) { |
fec5e652 | 3293 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
3294 | int cpu; |
3295 | ||
cece1945 | 3296 | preempt_disable(); |
b0e28f1e | 3297 | rcu_read_lock(); |
fec5e652 TH |
3298 | |
3299 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
3300 | if (cpu < 0) |
3301 | cpu = smp_processor_id(); | |
fec5e652 TH |
3302 | |
3303 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3304 | ||
b0e28f1e | 3305 | rcu_read_unlock(); |
cece1945 | 3306 | preempt_enable(); |
adc9300e ED |
3307 | } else |
3308 | #endif | |
fec5e652 TH |
3309 | { |
3310 | unsigned int qtail; | |
3311 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); | |
3312 | put_cpu(); | |
3313 | } | |
b0e28f1e | 3314 | return ret; |
1da177e4 | 3315 | } |
ae78dbfa BH |
3316 | |
3317 | /** | |
3318 | * netif_rx - post buffer to the network code | |
3319 | * @skb: buffer to post | |
3320 | * | |
3321 | * This function receives a packet from a device driver and queues it for | |
3322 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
3323 | * may be dropped during processing for congestion control or by the | |
3324 | * protocol layers. | |
3325 | * | |
3326 | * return values: | |
3327 | * NET_RX_SUCCESS (no congestion) | |
3328 | * NET_RX_DROP (packet was dropped) | |
3329 | * | |
3330 | */ | |
3331 | ||
3332 | int netif_rx(struct sk_buff *skb) | |
3333 | { | |
3334 | trace_netif_rx_entry(skb); | |
3335 | ||
3336 | return netif_rx_internal(skb); | |
3337 | } | |
d1b19dff | 3338 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
3339 | |
3340 | int netif_rx_ni(struct sk_buff *skb) | |
3341 | { | |
3342 | int err; | |
3343 | ||
ae78dbfa BH |
3344 | trace_netif_rx_ni_entry(skb); |
3345 | ||
1da177e4 | 3346 | preempt_disable(); |
ae78dbfa | 3347 | err = netif_rx_internal(skb); |
1da177e4 LT |
3348 | if (local_softirq_pending()) |
3349 | do_softirq(); | |
3350 | preempt_enable(); | |
3351 | ||
3352 | return err; | |
3353 | } | |
1da177e4 LT |
3354 | EXPORT_SYMBOL(netif_rx_ni); |
3355 | ||
1da177e4 LT |
3356 | static void net_tx_action(struct softirq_action *h) |
3357 | { | |
3358 | struct softnet_data *sd = &__get_cpu_var(softnet_data); | |
3359 | ||
3360 | if (sd->completion_queue) { | |
3361 | struct sk_buff *clist; | |
3362 | ||
3363 | local_irq_disable(); | |
3364 | clist = sd->completion_queue; | |
3365 | sd->completion_queue = NULL; | |
3366 | local_irq_enable(); | |
3367 | ||
3368 | while (clist) { | |
3369 | struct sk_buff *skb = clist; | |
3370 | clist = clist->next; | |
3371 | ||
547b792c | 3372 | WARN_ON(atomic_read(&skb->users)); |
e6247027 ED |
3373 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
3374 | trace_consume_skb(skb); | |
3375 | else | |
3376 | trace_kfree_skb(skb, net_tx_action); | |
1da177e4 LT |
3377 | __kfree_skb(skb); |
3378 | } | |
3379 | } | |
3380 | ||
3381 | if (sd->output_queue) { | |
37437bb2 | 3382 | struct Qdisc *head; |
1da177e4 LT |
3383 | |
3384 | local_irq_disable(); | |
3385 | head = sd->output_queue; | |
3386 | sd->output_queue = NULL; | |
a9cbd588 | 3387 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
3388 | local_irq_enable(); |
3389 | ||
3390 | while (head) { | |
37437bb2 DM |
3391 | struct Qdisc *q = head; |
3392 | spinlock_t *root_lock; | |
3393 | ||
1da177e4 LT |
3394 | head = head->next_sched; |
3395 | ||
5fb66229 | 3396 | root_lock = qdisc_lock(q); |
37437bb2 | 3397 | if (spin_trylock(root_lock)) { |
4e857c58 | 3398 | smp_mb__before_atomic(); |
def82a1d JP |
3399 | clear_bit(__QDISC_STATE_SCHED, |
3400 | &q->state); | |
37437bb2 DM |
3401 | qdisc_run(q); |
3402 | spin_unlock(root_lock); | |
1da177e4 | 3403 | } else { |
195648bb | 3404 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
e8a83e10 | 3405 | &q->state)) { |
195648bb | 3406 | __netif_reschedule(q); |
e8a83e10 | 3407 | } else { |
4e857c58 | 3408 | smp_mb__before_atomic(); |
e8a83e10 JP |
3409 | clear_bit(__QDISC_STATE_SCHED, |
3410 | &q->state); | |
3411 | } | |
1da177e4 LT |
3412 | } |
3413 | } | |
3414 | } | |
3415 | } | |
3416 | ||
ab95bfe0 JP |
3417 | #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \ |
3418 | (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)) | |
da678292 MM |
3419 | /* This hook is defined here for ATM LANE */ |
3420 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
3421 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 3422 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 3423 | #endif |
1da177e4 | 3424 | |
1da177e4 LT |
3425 | #ifdef CONFIG_NET_CLS_ACT |
3426 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
3427 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
3428 | * a compare and 2 stores extra right now if we dont have it on | |
3429 | * but have CONFIG_NET_CLS_ACT | |
25985edc LDM |
3430 | * NOTE: This doesn't stop any functionality; if you dont have |
3431 | * the ingress scheduler, you just can't add policies on ingress. | |
1da177e4 LT |
3432 | * |
3433 | */ | |
24824a09 | 3434 | static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq) |
1da177e4 | 3435 | { |
1da177e4 | 3436 | struct net_device *dev = skb->dev; |
f697c3e8 | 3437 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
555353cf DM |
3438 | int result = TC_ACT_OK; |
3439 | struct Qdisc *q; | |
4ec93edb | 3440 | |
de384830 | 3441 | if (unlikely(MAX_RED_LOOP < ttl++)) { |
e87cc472 JP |
3442 | net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n", |
3443 | skb->skb_iif, dev->ifindex); | |
f697c3e8 HX |
3444 | return TC_ACT_SHOT; |
3445 | } | |
1da177e4 | 3446 | |
f697c3e8 HX |
3447 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
3448 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); | |
1da177e4 | 3449 | |
83874000 | 3450 | q = rxq->qdisc; |
8d50b53d | 3451 | if (q != &noop_qdisc) { |
83874000 | 3452 | spin_lock(qdisc_lock(q)); |
a9312ae8 DM |
3453 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
3454 | result = qdisc_enqueue_root(skb, q); | |
83874000 DM |
3455 | spin_unlock(qdisc_lock(q)); |
3456 | } | |
f697c3e8 HX |
3457 | |
3458 | return result; | |
3459 | } | |
86e65da9 | 3460 | |
f697c3e8 HX |
3461 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
3462 | struct packet_type **pt_prev, | |
3463 | int *ret, struct net_device *orig_dev) | |
3464 | { | |
24824a09 ED |
3465 | struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue); |
3466 | ||
3467 | if (!rxq || rxq->qdisc == &noop_qdisc) | |
f697c3e8 | 3468 | goto out; |
1da177e4 | 3469 | |
f697c3e8 HX |
3470 | if (*pt_prev) { |
3471 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
3472 | *pt_prev = NULL; | |
1da177e4 LT |
3473 | } |
3474 | ||
24824a09 | 3475 | switch (ing_filter(skb, rxq)) { |
f697c3e8 HX |
3476 | case TC_ACT_SHOT: |
3477 | case TC_ACT_STOLEN: | |
3478 | kfree_skb(skb); | |
3479 | return NULL; | |
3480 | } | |
3481 | ||
3482 | out: | |
3483 | skb->tc_verd = 0; | |
3484 | return skb; | |
1da177e4 LT |
3485 | } |
3486 | #endif | |
3487 | ||
ab95bfe0 JP |
3488 | /** |
3489 | * netdev_rx_handler_register - register receive handler | |
3490 | * @dev: device to register a handler for | |
3491 | * @rx_handler: receive handler to register | |
93e2c32b | 3492 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 3493 | * |
e227867f | 3494 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
3495 | * called from __netif_receive_skb. A negative errno code is returned |
3496 | * on a failure. | |
3497 | * | |
3498 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
3499 | * |
3500 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
3501 | */ |
3502 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
3503 | rx_handler_func_t *rx_handler, |
3504 | void *rx_handler_data) | |
ab95bfe0 JP |
3505 | { |
3506 | ASSERT_RTNL(); | |
3507 | ||
3508 | if (dev->rx_handler) | |
3509 | return -EBUSY; | |
3510 | ||
00cfec37 | 3511 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 3512 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
3513 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
3514 | ||
3515 | return 0; | |
3516 | } | |
3517 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
3518 | ||
3519 | /** | |
3520 | * netdev_rx_handler_unregister - unregister receive handler | |
3521 | * @dev: device to unregister a handler from | |
3522 | * | |
166ec369 | 3523 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
3524 | * |
3525 | * The caller must hold the rtnl_mutex. | |
3526 | */ | |
3527 | void netdev_rx_handler_unregister(struct net_device *dev) | |
3528 | { | |
3529 | ||
3530 | ASSERT_RTNL(); | |
a9b3cd7f | 3531 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
3532 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
3533 | * section has a guarantee to see a non NULL rx_handler_data | |
3534 | * as well. | |
3535 | */ | |
3536 | synchronize_net(); | |
a9b3cd7f | 3537 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
3538 | } |
3539 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
3540 | ||
b4b9e355 MG |
3541 | /* |
3542 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
3543 | * the special handling of PFMEMALLOC skbs. | |
3544 | */ | |
3545 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
3546 | { | |
3547 | switch (skb->protocol) { | |
2b8837ae JP |
3548 | case htons(ETH_P_ARP): |
3549 | case htons(ETH_P_IP): | |
3550 | case htons(ETH_P_IPV6): | |
3551 | case htons(ETH_P_8021Q): | |
3552 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
3553 | return true; |
3554 | default: | |
3555 | return false; | |
3556 | } | |
3557 | } | |
3558 | ||
9754e293 | 3559 | static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc) |
1da177e4 LT |
3560 | { |
3561 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 3562 | rx_handler_func_t *rx_handler; |
f2ccd8fa | 3563 | struct net_device *orig_dev; |
63d8ea7f | 3564 | struct net_device *null_or_dev; |
8a4eb573 | 3565 | bool deliver_exact = false; |
1da177e4 | 3566 | int ret = NET_RX_DROP; |
252e3346 | 3567 | __be16 type; |
1da177e4 | 3568 | |
588f0330 | 3569 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 3570 | |
cf66ba58 | 3571 | trace_netif_receive_skb(skb); |
9b22ea56 | 3572 | |
cc9bd5ce | 3573 | orig_dev = skb->dev; |
8f903c70 | 3574 | |
c1d2bbe1 | 3575 | skb_reset_network_header(skb); |
fda55eca ED |
3576 | if (!skb_transport_header_was_set(skb)) |
3577 | skb_reset_transport_header(skb); | |
0b5c9db1 | 3578 | skb_reset_mac_len(skb); |
1da177e4 LT |
3579 | |
3580 | pt_prev = NULL; | |
3581 | ||
3582 | rcu_read_lock(); | |
3583 | ||
63d8ea7f | 3584 | another_round: |
b6858177 | 3585 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
3586 | |
3587 | __this_cpu_inc(softnet_data.processed); | |
3588 | ||
8ad227ff PM |
3589 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
3590 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
bcc6d479 JP |
3591 | skb = vlan_untag(skb); |
3592 | if (unlikely(!skb)) | |
b4b9e355 | 3593 | goto unlock; |
bcc6d479 JP |
3594 | } |
3595 | ||
1da177e4 LT |
3596 | #ifdef CONFIG_NET_CLS_ACT |
3597 | if (skb->tc_verd & TC_NCLS) { | |
3598 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
3599 | goto ncls; | |
3600 | } | |
3601 | #endif | |
3602 | ||
9754e293 | 3603 | if (pfmemalloc) |
b4b9e355 MG |
3604 | goto skip_taps; |
3605 | ||
1da177e4 | 3606 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
63d8ea7f | 3607 | if (!ptype->dev || ptype->dev == skb->dev) { |
4ec93edb | 3608 | if (pt_prev) |
f2ccd8fa | 3609 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
3610 | pt_prev = ptype; |
3611 | } | |
3612 | } | |
3613 | ||
b4b9e355 | 3614 | skip_taps: |
1da177e4 | 3615 | #ifdef CONFIG_NET_CLS_ACT |
f697c3e8 HX |
3616 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
3617 | if (!skb) | |
b4b9e355 | 3618 | goto unlock; |
1da177e4 LT |
3619 | ncls: |
3620 | #endif | |
3621 | ||
9754e293 | 3622 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
3623 | goto drop; |
3624 | ||
2425717b JF |
3625 | if (vlan_tx_tag_present(skb)) { |
3626 | if (pt_prev) { | |
3627 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3628 | pt_prev = NULL; | |
3629 | } | |
48cc32d3 | 3630 | if (vlan_do_receive(&skb)) |
2425717b JF |
3631 | goto another_round; |
3632 | else if (unlikely(!skb)) | |
b4b9e355 | 3633 | goto unlock; |
2425717b JF |
3634 | } |
3635 | ||
48cc32d3 | 3636 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
3637 | if (rx_handler) { |
3638 | if (pt_prev) { | |
3639 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3640 | pt_prev = NULL; | |
3641 | } | |
8a4eb573 JP |
3642 | switch (rx_handler(&skb)) { |
3643 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 3644 | ret = NET_RX_SUCCESS; |
b4b9e355 | 3645 | goto unlock; |
8a4eb573 | 3646 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 3647 | goto another_round; |
8a4eb573 JP |
3648 | case RX_HANDLER_EXACT: |
3649 | deliver_exact = true; | |
3650 | case RX_HANDLER_PASS: | |
3651 | break; | |
3652 | default: | |
3653 | BUG(); | |
3654 | } | |
ab95bfe0 | 3655 | } |
1da177e4 | 3656 | |
d4b812de ED |
3657 | if (unlikely(vlan_tx_tag_present(skb))) { |
3658 | if (vlan_tx_tag_get_id(skb)) | |
3659 | skb->pkt_type = PACKET_OTHERHOST; | |
3660 | /* Note: we might in the future use prio bits | |
3661 | * and set skb->priority like in vlan_do_receive() | |
3662 | * For the time being, just ignore Priority Code Point | |
3663 | */ | |
3664 | skb->vlan_tci = 0; | |
3665 | } | |
48cc32d3 | 3666 | |
63d8ea7f | 3667 | /* deliver only exact match when indicated */ |
8a4eb573 | 3668 | null_or_dev = deliver_exact ? skb->dev : NULL; |
1f3c8804 | 3669 | |
1da177e4 | 3670 | type = skb->protocol; |
82d8a867 PE |
3671 | list_for_each_entry_rcu(ptype, |
3672 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
63d8ea7f | 3673 | if (ptype->type == type && |
e3f48d37 JP |
3674 | (ptype->dev == null_or_dev || ptype->dev == skb->dev || |
3675 | ptype->dev == orig_dev)) { | |
4ec93edb | 3676 | if (pt_prev) |
f2ccd8fa | 3677 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
3678 | pt_prev = ptype; |
3679 | } | |
3680 | } | |
3681 | ||
3682 | if (pt_prev) { | |
1080e512 | 3683 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
0e698bf6 | 3684 | goto drop; |
1080e512 MT |
3685 | else |
3686 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1da177e4 | 3687 | } else { |
b4b9e355 | 3688 | drop: |
caf586e5 | 3689 | atomic_long_inc(&skb->dev->rx_dropped); |
1da177e4 LT |
3690 | kfree_skb(skb); |
3691 | /* Jamal, now you will not able to escape explaining | |
3692 | * me how you were going to use this. :-) | |
3693 | */ | |
3694 | ret = NET_RX_DROP; | |
3695 | } | |
3696 | ||
b4b9e355 | 3697 | unlock: |
1da177e4 | 3698 | rcu_read_unlock(); |
9754e293 DM |
3699 | return ret; |
3700 | } | |
3701 | ||
3702 | static int __netif_receive_skb(struct sk_buff *skb) | |
3703 | { | |
3704 | int ret; | |
3705 | ||
3706 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
3707 | unsigned long pflags = current->flags; | |
3708 | ||
3709 | /* | |
3710 | * PFMEMALLOC skbs are special, they should | |
3711 | * - be delivered to SOCK_MEMALLOC sockets only | |
3712 | * - stay away from userspace | |
3713 | * - have bounded memory usage | |
3714 | * | |
3715 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
3716 | * context down to all allocation sites. | |
3717 | */ | |
3718 | current->flags |= PF_MEMALLOC; | |
3719 | ret = __netif_receive_skb_core(skb, true); | |
3720 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
3721 | } else | |
3722 | ret = __netif_receive_skb_core(skb, false); | |
3723 | ||
1da177e4 LT |
3724 | return ret; |
3725 | } | |
0a9627f2 | 3726 | |
ae78dbfa | 3727 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 3728 | { |
588f0330 | 3729 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 3730 | |
c1f19b51 RC |
3731 | if (skb_defer_rx_timestamp(skb)) |
3732 | return NET_RX_SUCCESS; | |
3733 | ||
df334545 | 3734 | #ifdef CONFIG_RPS |
c5905afb | 3735 | if (static_key_false(&rps_needed)) { |
3b098e2d ED |
3736 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
3737 | int cpu, ret; | |
fec5e652 | 3738 | |
3b098e2d ED |
3739 | rcu_read_lock(); |
3740 | ||
3741 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
0a9627f2 | 3742 | |
3b098e2d ED |
3743 | if (cpu >= 0) { |
3744 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3745 | rcu_read_unlock(); | |
adc9300e | 3746 | return ret; |
3b098e2d | 3747 | } |
adc9300e | 3748 | rcu_read_unlock(); |
fec5e652 | 3749 | } |
1e94d72f | 3750 | #endif |
adc9300e | 3751 | return __netif_receive_skb(skb); |
0a9627f2 | 3752 | } |
ae78dbfa BH |
3753 | |
3754 | /** | |
3755 | * netif_receive_skb - process receive buffer from network | |
3756 | * @skb: buffer to process | |
3757 | * | |
3758 | * netif_receive_skb() is the main receive data processing function. | |
3759 | * It always succeeds. The buffer may be dropped during processing | |
3760 | * for congestion control or by the protocol layers. | |
3761 | * | |
3762 | * This function may only be called from softirq context and interrupts | |
3763 | * should be enabled. | |
3764 | * | |
3765 | * Return values (usually ignored): | |
3766 | * NET_RX_SUCCESS: no congestion | |
3767 | * NET_RX_DROP: packet was dropped | |
3768 | */ | |
3769 | int netif_receive_skb(struct sk_buff *skb) | |
3770 | { | |
3771 | trace_netif_receive_skb_entry(skb); | |
3772 | ||
3773 | return netif_receive_skb_internal(skb); | |
3774 | } | |
d1b19dff | 3775 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 3776 | |
88751275 ED |
3777 | /* Network device is going away, flush any packets still pending |
3778 | * Called with irqs disabled. | |
3779 | */ | |
152102c7 | 3780 | static void flush_backlog(void *arg) |
6e583ce5 | 3781 | { |
152102c7 | 3782 | struct net_device *dev = arg; |
e36fa2f7 | 3783 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
6e583ce5 SH |
3784 | struct sk_buff *skb, *tmp; |
3785 | ||
e36fa2f7 | 3786 | rps_lock(sd); |
6e7676c1 | 3787 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
6e583ce5 | 3788 | if (skb->dev == dev) { |
e36fa2f7 | 3789 | __skb_unlink(skb, &sd->input_pkt_queue); |
6e583ce5 | 3790 | kfree_skb(skb); |
76cc8b13 | 3791 | input_queue_head_incr(sd); |
6e583ce5 | 3792 | } |
6e7676c1 | 3793 | } |
e36fa2f7 | 3794 | rps_unlock(sd); |
6e7676c1 CG |
3795 | |
3796 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
3797 | if (skb->dev == dev) { | |
3798 | __skb_unlink(skb, &sd->process_queue); | |
3799 | kfree_skb(skb); | |
76cc8b13 | 3800 | input_queue_head_incr(sd); |
6e7676c1 CG |
3801 | } |
3802 | } | |
6e583ce5 SH |
3803 | } |
3804 | ||
d565b0a1 HX |
3805 | static int napi_gro_complete(struct sk_buff *skb) |
3806 | { | |
22061d80 | 3807 | struct packet_offload *ptype; |
d565b0a1 | 3808 | __be16 type = skb->protocol; |
22061d80 | 3809 | struct list_head *head = &offload_base; |
d565b0a1 HX |
3810 | int err = -ENOENT; |
3811 | ||
c3c7c254 ED |
3812 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
3813 | ||
fc59f9a3 HX |
3814 | if (NAPI_GRO_CB(skb)->count == 1) { |
3815 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 3816 | goto out; |
fc59f9a3 | 3817 | } |
d565b0a1 HX |
3818 | |
3819 | rcu_read_lock(); | |
3820 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 3821 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
3822 | continue; |
3823 | ||
299603e8 | 3824 | err = ptype->callbacks.gro_complete(skb, 0); |
d565b0a1 HX |
3825 | break; |
3826 | } | |
3827 | rcu_read_unlock(); | |
3828 | ||
3829 | if (err) { | |
3830 | WARN_ON(&ptype->list == head); | |
3831 | kfree_skb(skb); | |
3832 | return NET_RX_SUCCESS; | |
3833 | } | |
3834 | ||
3835 | out: | |
ae78dbfa | 3836 | return netif_receive_skb_internal(skb); |
d565b0a1 HX |
3837 | } |
3838 | ||
2e71a6f8 ED |
3839 | /* napi->gro_list contains packets ordered by age. |
3840 | * youngest packets at the head of it. | |
3841 | * Complete skbs in reverse order to reduce latencies. | |
3842 | */ | |
3843 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
d565b0a1 | 3844 | { |
2e71a6f8 | 3845 | struct sk_buff *skb, *prev = NULL; |
d565b0a1 | 3846 | |
2e71a6f8 ED |
3847 | /* scan list and build reverse chain */ |
3848 | for (skb = napi->gro_list; skb != NULL; skb = skb->next) { | |
3849 | skb->prev = prev; | |
3850 | prev = skb; | |
3851 | } | |
3852 | ||
3853 | for (skb = prev; skb; skb = prev) { | |
d565b0a1 | 3854 | skb->next = NULL; |
2e71a6f8 ED |
3855 | |
3856 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) | |
3857 | return; | |
3858 | ||
3859 | prev = skb->prev; | |
d565b0a1 | 3860 | napi_gro_complete(skb); |
2e71a6f8 | 3861 | napi->gro_count--; |
d565b0a1 HX |
3862 | } |
3863 | ||
3864 | napi->gro_list = NULL; | |
3865 | } | |
86cac58b | 3866 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 3867 | |
89c5fa33 ED |
3868 | static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb) |
3869 | { | |
3870 | struct sk_buff *p; | |
3871 | unsigned int maclen = skb->dev->hard_header_len; | |
0b4cec8c | 3872 | u32 hash = skb_get_hash_raw(skb); |
89c5fa33 ED |
3873 | |
3874 | for (p = napi->gro_list; p; p = p->next) { | |
3875 | unsigned long diffs; | |
3876 | ||
0b4cec8c TH |
3877 | NAPI_GRO_CB(p)->flush = 0; |
3878 | ||
3879 | if (hash != skb_get_hash_raw(p)) { | |
3880 | NAPI_GRO_CB(p)->same_flow = 0; | |
3881 | continue; | |
3882 | } | |
3883 | ||
89c5fa33 ED |
3884 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
3885 | diffs |= p->vlan_tci ^ skb->vlan_tci; | |
3886 | if (maclen == ETH_HLEN) | |
3887 | diffs |= compare_ether_header(skb_mac_header(p), | |
a50e233c | 3888 | skb_mac_header(skb)); |
89c5fa33 ED |
3889 | else if (!diffs) |
3890 | diffs = memcmp(skb_mac_header(p), | |
a50e233c | 3891 | skb_mac_header(skb), |
89c5fa33 ED |
3892 | maclen); |
3893 | NAPI_GRO_CB(p)->same_flow = !diffs; | |
89c5fa33 ED |
3894 | } |
3895 | } | |
3896 | ||
299603e8 JC |
3897 | static void skb_gro_reset_offset(struct sk_buff *skb) |
3898 | { | |
3899 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
3900 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
3901 | ||
3902 | NAPI_GRO_CB(skb)->data_offset = 0; | |
3903 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
3904 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
3905 | ||
3906 | if (skb_mac_header(skb) == skb_tail_pointer(skb) && | |
3907 | pinfo->nr_frags && | |
3908 | !PageHighMem(skb_frag_page(frag0))) { | |
3909 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); | |
3910 | NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0); | |
89c5fa33 ED |
3911 | } |
3912 | } | |
3913 | ||
a50e233c ED |
3914 | static void gro_pull_from_frag0(struct sk_buff *skb, int grow) |
3915 | { | |
3916 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
3917 | ||
3918 | BUG_ON(skb->end - skb->tail < grow); | |
3919 | ||
3920 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
3921 | ||
3922 | skb->data_len -= grow; | |
3923 | skb->tail += grow; | |
3924 | ||
3925 | pinfo->frags[0].page_offset += grow; | |
3926 | skb_frag_size_sub(&pinfo->frags[0], grow); | |
3927 | ||
3928 | if (unlikely(!skb_frag_size(&pinfo->frags[0]))) { | |
3929 | skb_frag_unref(skb, 0); | |
3930 | memmove(pinfo->frags, pinfo->frags + 1, | |
3931 | --pinfo->nr_frags * sizeof(pinfo->frags[0])); | |
3932 | } | |
3933 | } | |
3934 | ||
bb728820 | 3935 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 HX |
3936 | { |
3937 | struct sk_buff **pp = NULL; | |
22061d80 | 3938 | struct packet_offload *ptype; |
d565b0a1 | 3939 | __be16 type = skb->protocol; |
22061d80 | 3940 | struct list_head *head = &offload_base; |
0da2afd5 | 3941 | int same_flow; |
5b252f0c | 3942 | enum gro_result ret; |
a50e233c | 3943 | int grow; |
d565b0a1 | 3944 | |
9c62a68d | 3945 | if (!(skb->dev->features & NETIF_F_GRO)) |
d565b0a1 HX |
3946 | goto normal; |
3947 | ||
21dc3301 | 3948 | if (skb_is_gso(skb) || skb_has_frag_list(skb)) |
f17f5c91 HX |
3949 | goto normal; |
3950 | ||
89c5fa33 | 3951 | gro_list_prepare(napi, skb); |
bf5a755f | 3952 | NAPI_GRO_CB(skb)->csum = skb->csum; /* Needed for CHECKSUM_COMPLETE */ |
89c5fa33 | 3953 | |
d565b0a1 HX |
3954 | rcu_read_lock(); |
3955 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 3956 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
3957 | continue; |
3958 | ||
86911732 | 3959 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 3960 | skb_reset_mac_len(skb); |
d565b0a1 HX |
3961 | NAPI_GRO_CB(skb)->same_flow = 0; |
3962 | NAPI_GRO_CB(skb)->flush = 0; | |
5d38a079 | 3963 | NAPI_GRO_CB(skb)->free = 0; |
b582ef09 | 3964 | NAPI_GRO_CB(skb)->udp_mark = 0; |
d565b0a1 | 3965 | |
f191a1d1 | 3966 | pp = ptype->callbacks.gro_receive(&napi->gro_list, skb); |
d565b0a1 HX |
3967 | break; |
3968 | } | |
3969 | rcu_read_unlock(); | |
3970 | ||
3971 | if (&ptype->list == head) | |
3972 | goto normal; | |
3973 | ||
0da2afd5 | 3974 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 3975 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 3976 | |
d565b0a1 HX |
3977 | if (pp) { |
3978 | struct sk_buff *nskb = *pp; | |
3979 | ||
3980 | *pp = nskb->next; | |
3981 | nskb->next = NULL; | |
3982 | napi_gro_complete(nskb); | |
4ae5544f | 3983 | napi->gro_count--; |
d565b0a1 HX |
3984 | } |
3985 | ||
0da2afd5 | 3986 | if (same_flow) |
d565b0a1 HX |
3987 | goto ok; |
3988 | ||
600adc18 | 3989 | if (NAPI_GRO_CB(skb)->flush) |
d565b0a1 | 3990 | goto normal; |
d565b0a1 | 3991 | |
600adc18 ED |
3992 | if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) { |
3993 | struct sk_buff *nskb = napi->gro_list; | |
3994 | ||
3995 | /* locate the end of the list to select the 'oldest' flow */ | |
3996 | while (nskb->next) { | |
3997 | pp = &nskb->next; | |
3998 | nskb = *pp; | |
3999 | } | |
4000 | *pp = NULL; | |
4001 | nskb->next = NULL; | |
4002 | napi_gro_complete(nskb); | |
4003 | } else { | |
4004 | napi->gro_count++; | |
4005 | } | |
d565b0a1 | 4006 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 4007 | NAPI_GRO_CB(skb)->age = jiffies; |
29e98242 | 4008 | NAPI_GRO_CB(skb)->last = skb; |
86911732 | 4009 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
d565b0a1 HX |
4010 | skb->next = napi->gro_list; |
4011 | napi->gro_list = skb; | |
5d0d9be8 | 4012 | ret = GRO_HELD; |
d565b0a1 | 4013 | |
ad0f9904 | 4014 | pull: |
a50e233c ED |
4015 | grow = skb_gro_offset(skb) - skb_headlen(skb); |
4016 | if (grow > 0) | |
4017 | gro_pull_from_frag0(skb, grow); | |
d565b0a1 | 4018 | ok: |
5d0d9be8 | 4019 | return ret; |
d565b0a1 HX |
4020 | |
4021 | normal: | |
ad0f9904 HX |
4022 | ret = GRO_NORMAL; |
4023 | goto pull; | |
5d38a079 | 4024 | } |
96e93eab | 4025 | |
bf5a755f JC |
4026 | struct packet_offload *gro_find_receive_by_type(__be16 type) |
4027 | { | |
4028 | struct list_head *offload_head = &offload_base; | |
4029 | struct packet_offload *ptype; | |
4030 | ||
4031 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
4032 | if (ptype->type != type || !ptype->callbacks.gro_receive) | |
4033 | continue; | |
4034 | return ptype; | |
4035 | } | |
4036 | return NULL; | |
4037 | } | |
e27a2f83 | 4038 | EXPORT_SYMBOL(gro_find_receive_by_type); |
bf5a755f JC |
4039 | |
4040 | struct packet_offload *gro_find_complete_by_type(__be16 type) | |
4041 | { | |
4042 | struct list_head *offload_head = &offload_base; | |
4043 | struct packet_offload *ptype; | |
4044 | ||
4045 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
4046 | if (ptype->type != type || !ptype->callbacks.gro_complete) | |
4047 | continue; | |
4048 | return ptype; | |
4049 | } | |
4050 | return NULL; | |
4051 | } | |
e27a2f83 | 4052 | EXPORT_SYMBOL(gro_find_complete_by_type); |
5d38a079 | 4053 | |
bb728820 | 4054 | static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
5d38a079 | 4055 | { |
5d0d9be8 HX |
4056 | switch (ret) { |
4057 | case GRO_NORMAL: | |
ae78dbfa | 4058 | if (netif_receive_skb_internal(skb)) |
c7c4b3b6 BH |
4059 | ret = GRO_DROP; |
4060 | break; | |
5d38a079 | 4061 | |
5d0d9be8 | 4062 | case GRO_DROP: |
5d38a079 HX |
4063 | kfree_skb(skb); |
4064 | break; | |
5b252f0c | 4065 | |
daa86548 | 4066 | case GRO_MERGED_FREE: |
d7e8883c ED |
4067 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
4068 | kmem_cache_free(skbuff_head_cache, skb); | |
4069 | else | |
4070 | __kfree_skb(skb); | |
daa86548 ED |
4071 | break; |
4072 | ||
5b252f0c BH |
4073 | case GRO_HELD: |
4074 | case GRO_MERGED: | |
4075 | break; | |
5d38a079 HX |
4076 | } |
4077 | ||
c7c4b3b6 | 4078 | return ret; |
5d0d9be8 | 4079 | } |
5d0d9be8 | 4080 | |
c7c4b3b6 | 4081 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 4082 | { |
ae78dbfa | 4083 | trace_napi_gro_receive_entry(skb); |
86911732 | 4084 | |
a50e233c ED |
4085 | skb_gro_reset_offset(skb); |
4086 | ||
89c5fa33 | 4087 | return napi_skb_finish(dev_gro_receive(napi, skb), skb); |
d565b0a1 HX |
4088 | } |
4089 | EXPORT_SYMBOL(napi_gro_receive); | |
4090 | ||
d0c2b0d2 | 4091 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 4092 | { |
96e93eab | 4093 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
4094 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
4095 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
3701e513 | 4096 | skb->vlan_tci = 0; |
66c46d74 | 4097 | skb->dev = napi->dev; |
6d152e23 | 4098 | skb->skb_iif = 0; |
c3caf119 JC |
4099 | skb->encapsulation = 0; |
4100 | skb_shinfo(skb)->gso_type = 0; | |
e33d0ba8 | 4101 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
96e93eab HX |
4102 | |
4103 | napi->skb = skb; | |
4104 | } | |
96e93eab | 4105 | |
76620aaf | 4106 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 4107 | { |
5d38a079 | 4108 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
4109 | |
4110 | if (!skb) { | |
89d71a66 | 4111 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
84b9cd63 | 4112 | napi->skb = skb; |
80595d59 | 4113 | } |
96e93eab HX |
4114 | return skb; |
4115 | } | |
76620aaf | 4116 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 4117 | |
a50e233c ED |
4118 | static gro_result_t napi_frags_finish(struct napi_struct *napi, |
4119 | struct sk_buff *skb, | |
4120 | gro_result_t ret) | |
96e93eab | 4121 | { |
5d0d9be8 HX |
4122 | switch (ret) { |
4123 | case GRO_NORMAL: | |
a50e233c ED |
4124 | case GRO_HELD: |
4125 | __skb_push(skb, ETH_HLEN); | |
4126 | skb->protocol = eth_type_trans(skb, skb->dev); | |
4127 | if (ret == GRO_NORMAL && netif_receive_skb_internal(skb)) | |
c7c4b3b6 | 4128 | ret = GRO_DROP; |
86911732 | 4129 | break; |
5d38a079 | 4130 | |
5d0d9be8 | 4131 | case GRO_DROP: |
5d0d9be8 HX |
4132 | case GRO_MERGED_FREE: |
4133 | napi_reuse_skb(napi, skb); | |
4134 | break; | |
5b252f0c BH |
4135 | |
4136 | case GRO_MERGED: | |
4137 | break; | |
5d0d9be8 | 4138 | } |
5d38a079 | 4139 | |
c7c4b3b6 | 4140 | return ret; |
5d38a079 | 4141 | } |
5d0d9be8 | 4142 | |
a50e233c ED |
4143 | /* Upper GRO stack assumes network header starts at gro_offset=0 |
4144 | * Drivers could call both napi_gro_frags() and napi_gro_receive() | |
4145 | * We copy ethernet header into skb->data to have a common layout. | |
4146 | */ | |
4adb9c4a | 4147 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
4148 | { |
4149 | struct sk_buff *skb = napi->skb; | |
a50e233c ED |
4150 | const struct ethhdr *eth; |
4151 | unsigned int hlen = sizeof(*eth); | |
76620aaf HX |
4152 | |
4153 | napi->skb = NULL; | |
4154 | ||
a50e233c ED |
4155 | skb_reset_mac_header(skb); |
4156 | skb_gro_reset_offset(skb); | |
4157 | ||
4158 | eth = skb_gro_header_fast(skb, 0); | |
4159 | if (unlikely(skb_gro_header_hard(skb, hlen))) { | |
4160 | eth = skb_gro_header_slow(skb, hlen, 0); | |
4161 | if (unlikely(!eth)) { | |
4162 | napi_reuse_skb(napi, skb); | |
4163 | return NULL; | |
4164 | } | |
4165 | } else { | |
4166 | gro_pull_from_frag0(skb, hlen); | |
4167 | NAPI_GRO_CB(skb)->frag0 += hlen; | |
4168 | NAPI_GRO_CB(skb)->frag0_len -= hlen; | |
76620aaf | 4169 | } |
a50e233c ED |
4170 | __skb_pull(skb, hlen); |
4171 | ||
4172 | /* | |
4173 | * This works because the only protocols we care about don't require | |
4174 | * special handling. | |
4175 | * We'll fix it up properly in napi_frags_finish() | |
4176 | */ | |
4177 | skb->protocol = eth->h_proto; | |
76620aaf | 4178 | |
76620aaf HX |
4179 | return skb; |
4180 | } | |
76620aaf | 4181 | |
c7c4b3b6 | 4182 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 4183 | { |
76620aaf | 4184 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
4185 | |
4186 | if (!skb) | |
c7c4b3b6 | 4187 | return GRO_DROP; |
5d0d9be8 | 4188 | |
ae78dbfa BH |
4189 | trace_napi_gro_frags_entry(skb); |
4190 | ||
89c5fa33 | 4191 | return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
5d0d9be8 | 4192 | } |
5d38a079 HX |
4193 | EXPORT_SYMBOL(napi_gro_frags); |
4194 | ||
e326bed2 | 4195 | /* |
855abcf0 | 4196 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
4197 | * Note: called with local irq disabled, but exits with local irq enabled. |
4198 | */ | |
4199 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
4200 | { | |
4201 | #ifdef CONFIG_RPS | |
4202 | struct softnet_data *remsd = sd->rps_ipi_list; | |
4203 | ||
4204 | if (remsd) { | |
4205 | sd->rps_ipi_list = NULL; | |
4206 | ||
4207 | local_irq_enable(); | |
4208 | ||
4209 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
4210 | while (remsd) { | |
4211 | struct softnet_data *next = remsd->rps_ipi_next; | |
4212 | ||
4213 | if (cpu_online(remsd->cpu)) | |
c46fff2a | 4214 | smp_call_function_single_async(remsd->cpu, |
fce8ad15 | 4215 | &remsd->csd); |
e326bed2 ED |
4216 | remsd = next; |
4217 | } | |
4218 | } else | |
4219 | #endif | |
4220 | local_irq_enable(); | |
4221 | } | |
4222 | ||
bea3348e | 4223 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 LT |
4224 | { |
4225 | int work = 0; | |
eecfd7c4 | 4226 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
1da177e4 | 4227 | |
e326bed2 ED |
4228 | #ifdef CONFIG_RPS |
4229 | /* Check if we have pending ipi, its better to send them now, | |
4230 | * not waiting net_rx_action() end. | |
4231 | */ | |
4232 | if (sd->rps_ipi_list) { | |
4233 | local_irq_disable(); | |
4234 | net_rps_action_and_irq_enable(sd); | |
4235 | } | |
4236 | #endif | |
bea3348e | 4237 | napi->weight = weight_p; |
6e7676c1 | 4238 | local_irq_disable(); |
11ef7a89 | 4239 | while (1) { |
1da177e4 | 4240 | struct sk_buff *skb; |
6e7676c1 CG |
4241 | |
4242 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
4243 | local_irq_enable(); | |
4244 | __netif_receive_skb(skb); | |
6e7676c1 | 4245 | local_irq_disable(); |
76cc8b13 TH |
4246 | input_queue_head_incr(sd); |
4247 | if (++work >= quota) { | |
4248 | local_irq_enable(); | |
4249 | return work; | |
4250 | } | |
6e7676c1 | 4251 | } |
1da177e4 | 4252 | |
e36fa2f7 | 4253 | rps_lock(sd); |
11ef7a89 | 4254 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
4255 | /* |
4256 | * Inline a custom version of __napi_complete(). | |
4257 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
4258 | * and NAPI_STATE_SCHED is the only possible flag set |
4259 | * on backlog. | |
4260 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
4261 | * and we dont need an smp_mb() memory barrier. |
4262 | */ | |
4263 | list_del(&napi->poll_list); | |
4264 | napi->state = 0; | |
11ef7a89 | 4265 | rps_unlock(sd); |
eecfd7c4 | 4266 | |
11ef7a89 | 4267 | break; |
bea3348e | 4268 | } |
11ef7a89 TH |
4269 | |
4270 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
4271 | &sd->process_queue); | |
e36fa2f7 | 4272 | rps_unlock(sd); |
6e7676c1 CG |
4273 | } |
4274 | local_irq_enable(); | |
1da177e4 | 4275 | |
bea3348e SH |
4276 | return work; |
4277 | } | |
1da177e4 | 4278 | |
bea3348e SH |
4279 | /** |
4280 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 4281 | * @n: entry to schedule |
bea3348e SH |
4282 | * |
4283 | * The entry's receive function will be scheduled to run | |
4284 | */ | |
b5606c2d | 4285 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
4286 | { |
4287 | unsigned long flags; | |
1da177e4 | 4288 | |
bea3348e | 4289 | local_irq_save(flags); |
eecfd7c4 | 4290 | ____napi_schedule(&__get_cpu_var(softnet_data), n); |
bea3348e | 4291 | local_irq_restore(flags); |
1da177e4 | 4292 | } |
bea3348e SH |
4293 | EXPORT_SYMBOL(__napi_schedule); |
4294 | ||
d565b0a1 HX |
4295 | void __napi_complete(struct napi_struct *n) |
4296 | { | |
4297 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); | |
4298 | BUG_ON(n->gro_list); | |
4299 | ||
4300 | list_del(&n->poll_list); | |
4e857c58 | 4301 | smp_mb__before_atomic(); |
d565b0a1 HX |
4302 | clear_bit(NAPI_STATE_SCHED, &n->state); |
4303 | } | |
4304 | EXPORT_SYMBOL(__napi_complete); | |
4305 | ||
4306 | void napi_complete(struct napi_struct *n) | |
4307 | { | |
4308 | unsigned long flags; | |
4309 | ||
4310 | /* | |
4311 | * don't let napi dequeue from the cpu poll list | |
4312 | * just in case its running on a different cpu | |
4313 | */ | |
4314 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) | |
4315 | return; | |
4316 | ||
2e71a6f8 | 4317 | napi_gro_flush(n, false); |
d565b0a1 HX |
4318 | local_irq_save(flags); |
4319 | __napi_complete(n); | |
4320 | local_irq_restore(flags); | |
4321 | } | |
4322 | EXPORT_SYMBOL(napi_complete); | |
4323 | ||
af12fa6e ET |
4324 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
4325 | struct napi_struct *napi_by_id(unsigned int napi_id) | |
4326 | { | |
4327 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
4328 | struct napi_struct *napi; | |
4329 | ||
4330 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
4331 | if (napi->napi_id == napi_id) | |
4332 | return napi; | |
4333 | ||
4334 | return NULL; | |
4335 | } | |
4336 | EXPORT_SYMBOL_GPL(napi_by_id); | |
4337 | ||
4338 | void napi_hash_add(struct napi_struct *napi) | |
4339 | { | |
4340 | if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) { | |
4341 | ||
4342 | spin_lock(&napi_hash_lock); | |
4343 | ||
4344 | /* 0 is not a valid id, we also skip an id that is taken | |
4345 | * we expect both events to be extremely rare | |
4346 | */ | |
4347 | napi->napi_id = 0; | |
4348 | while (!napi->napi_id) { | |
4349 | napi->napi_id = ++napi_gen_id; | |
4350 | if (napi_by_id(napi->napi_id)) | |
4351 | napi->napi_id = 0; | |
4352 | } | |
4353 | ||
4354 | hlist_add_head_rcu(&napi->napi_hash_node, | |
4355 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
4356 | ||
4357 | spin_unlock(&napi_hash_lock); | |
4358 | } | |
4359 | } | |
4360 | EXPORT_SYMBOL_GPL(napi_hash_add); | |
4361 | ||
4362 | /* Warning : caller is responsible to make sure rcu grace period | |
4363 | * is respected before freeing memory containing @napi | |
4364 | */ | |
4365 | void napi_hash_del(struct napi_struct *napi) | |
4366 | { | |
4367 | spin_lock(&napi_hash_lock); | |
4368 | ||
4369 | if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) | |
4370 | hlist_del_rcu(&napi->napi_hash_node); | |
4371 | ||
4372 | spin_unlock(&napi_hash_lock); | |
4373 | } | |
4374 | EXPORT_SYMBOL_GPL(napi_hash_del); | |
4375 | ||
d565b0a1 HX |
4376 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
4377 | int (*poll)(struct napi_struct *, int), int weight) | |
4378 | { | |
4379 | INIT_LIST_HEAD(&napi->poll_list); | |
4ae5544f | 4380 | napi->gro_count = 0; |
d565b0a1 | 4381 | napi->gro_list = NULL; |
5d38a079 | 4382 | napi->skb = NULL; |
d565b0a1 | 4383 | napi->poll = poll; |
82dc3c63 ED |
4384 | if (weight > NAPI_POLL_WEIGHT) |
4385 | pr_err_once("netif_napi_add() called with weight %d on device %s\n", | |
4386 | weight, dev->name); | |
d565b0a1 HX |
4387 | napi->weight = weight; |
4388 | list_add(&napi->dev_list, &dev->napi_list); | |
d565b0a1 | 4389 | napi->dev = dev; |
5d38a079 | 4390 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
4391 | spin_lock_init(&napi->poll_lock); |
4392 | napi->poll_owner = -1; | |
4393 | #endif | |
4394 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
4395 | } | |
4396 | EXPORT_SYMBOL(netif_napi_add); | |
4397 | ||
4398 | void netif_napi_del(struct napi_struct *napi) | |
4399 | { | |
d7b06636 | 4400 | list_del_init(&napi->dev_list); |
76620aaf | 4401 | napi_free_frags(napi); |
d565b0a1 | 4402 | |
289dccbe | 4403 | kfree_skb_list(napi->gro_list); |
d565b0a1 | 4404 | napi->gro_list = NULL; |
4ae5544f | 4405 | napi->gro_count = 0; |
d565b0a1 HX |
4406 | } |
4407 | EXPORT_SYMBOL(netif_napi_del); | |
4408 | ||
1da177e4 LT |
4409 | static void net_rx_action(struct softirq_action *h) |
4410 | { | |
e326bed2 | 4411 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
24f8b238 | 4412 | unsigned long time_limit = jiffies + 2; |
51b0bded | 4413 | int budget = netdev_budget; |
53fb95d3 MM |
4414 | void *have; |
4415 | ||
1da177e4 LT |
4416 | local_irq_disable(); |
4417 | ||
e326bed2 | 4418 | while (!list_empty(&sd->poll_list)) { |
bea3348e SH |
4419 | struct napi_struct *n; |
4420 | int work, weight; | |
1da177e4 | 4421 | |
bea3348e | 4422 | /* If softirq window is exhuasted then punt. |
24f8b238 SH |
4423 | * Allow this to run for 2 jiffies since which will allow |
4424 | * an average latency of 1.5/HZ. | |
bea3348e | 4425 | */ |
d1f41b67 | 4426 | if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit))) |
1da177e4 LT |
4427 | goto softnet_break; |
4428 | ||
4429 | local_irq_enable(); | |
4430 | ||
bea3348e SH |
4431 | /* Even though interrupts have been re-enabled, this |
4432 | * access is safe because interrupts can only add new | |
4433 | * entries to the tail of this list, and only ->poll() | |
4434 | * calls can remove this head entry from the list. | |
4435 | */ | |
e326bed2 | 4436 | n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list); |
1da177e4 | 4437 | |
bea3348e SH |
4438 | have = netpoll_poll_lock(n); |
4439 | ||
4440 | weight = n->weight; | |
4441 | ||
0a7606c1 DM |
4442 | /* This NAPI_STATE_SCHED test is for avoiding a race |
4443 | * with netpoll's poll_napi(). Only the entity which | |
4444 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
4445 | * actually make the ->poll() call. Therefore we avoid | |
25985edc | 4446 | * accidentally calling ->poll() when NAPI is not scheduled. |
0a7606c1 DM |
4447 | */ |
4448 | work = 0; | |
4ea7e386 | 4449 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
0a7606c1 | 4450 | work = n->poll(n, weight); |
4ea7e386 NH |
4451 | trace_napi_poll(n); |
4452 | } | |
bea3348e SH |
4453 | |
4454 | WARN_ON_ONCE(work > weight); | |
4455 | ||
4456 | budget -= work; | |
4457 | ||
4458 | local_irq_disable(); | |
4459 | ||
4460 | /* Drivers must not modify the NAPI state if they | |
4461 | * consume the entire weight. In such cases this code | |
4462 | * still "owns" the NAPI instance and therefore can | |
4463 | * move the instance around on the list at-will. | |
4464 | */ | |
fed17f30 | 4465 | if (unlikely(work == weight)) { |
ff780cd8 HX |
4466 | if (unlikely(napi_disable_pending(n))) { |
4467 | local_irq_enable(); | |
4468 | napi_complete(n); | |
4469 | local_irq_disable(); | |
2e71a6f8 ED |
4470 | } else { |
4471 | if (n->gro_list) { | |
4472 | /* flush too old packets | |
4473 | * If HZ < 1000, flush all packets. | |
4474 | */ | |
4475 | local_irq_enable(); | |
4476 | napi_gro_flush(n, HZ >= 1000); | |
4477 | local_irq_disable(); | |
4478 | } | |
e326bed2 | 4479 | list_move_tail(&n->poll_list, &sd->poll_list); |
2e71a6f8 | 4480 | } |
fed17f30 | 4481 | } |
bea3348e SH |
4482 | |
4483 | netpoll_poll_unlock(have); | |
1da177e4 LT |
4484 | } |
4485 | out: | |
e326bed2 | 4486 | net_rps_action_and_irq_enable(sd); |
0a9627f2 | 4487 | |
db217334 CL |
4488 | #ifdef CONFIG_NET_DMA |
4489 | /* | |
4490 | * There may not be any more sk_buffs coming right now, so push | |
4491 | * any pending DMA copies to hardware | |
4492 | */ | |
2ba05622 | 4493 | dma_issue_pending_all(); |
db217334 | 4494 | #endif |
bea3348e | 4495 | |
1da177e4 LT |
4496 | return; |
4497 | ||
4498 | softnet_break: | |
dee42870 | 4499 | sd->time_squeeze++; |
1da177e4 LT |
4500 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
4501 | goto out; | |
4502 | } | |
4503 | ||
aa9d8560 | 4504 | struct netdev_adjacent { |
9ff162a8 | 4505 | struct net_device *dev; |
5d261913 VF |
4506 | |
4507 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 4508 | bool master; |
5d261913 | 4509 | |
5d261913 VF |
4510 | /* counter for the number of times this device was added to us */ |
4511 | u16 ref_nr; | |
4512 | ||
402dae96 VF |
4513 | /* private field for the users */ |
4514 | void *private; | |
4515 | ||
9ff162a8 JP |
4516 | struct list_head list; |
4517 | struct rcu_head rcu; | |
9ff162a8 JP |
4518 | }; |
4519 | ||
5d261913 VF |
4520 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev, |
4521 | struct net_device *adj_dev, | |
2f268f12 | 4522 | struct list_head *adj_list) |
9ff162a8 | 4523 | { |
5d261913 | 4524 | struct netdev_adjacent *adj; |
5d261913 | 4525 | |
2f268f12 | 4526 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
4527 | if (adj->dev == adj_dev) |
4528 | return adj; | |
9ff162a8 JP |
4529 | } |
4530 | return NULL; | |
4531 | } | |
4532 | ||
4533 | /** | |
4534 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
4535 | * @dev: device | |
4536 | * @upper_dev: upper device to check | |
4537 | * | |
4538 | * Find out if a device is linked to specified upper device and return true | |
4539 | * in case it is. Note that this checks only immediate upper device, | |
4540 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
4541 | */ | |
4542 | bool netdev_has_upper_dev(struct net_device *dev, | |
4543 | struct net_device *upper_dev) | |
4544 | { | |
4545 | ASSERT_RTNL(); | |
4546 | ||
2f268f12 | 4547 | return __netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper); |
9ff162a8 JP |
4548 | } |
4549 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
4550 | ||
4551 | /** | |
4552 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
4553 | * @dev: device | |
4554 | * | |
4555 | * Find out if a device is linked to an upper device and return true in case | |
4556 | * it is. The caller must hold the RTNL lock. | |
4557 | */ | |
1d143d9f | 4558 | static bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
4559 | { |
4560 | ASSERT_RTNL(); | |
4561 | ||
2f268f12 | 4562 | return !list_empty(&dev->all_adj_list.upper); |
9ff162a8 | 4563 | } |
9ff162a8 JP |
4564 | |
4565 | /** | |
4566 | * netdev_master_upper_dev_get - Get master upper device | |
4567 | * @dev: device | |
4568 | * | |
4569 | * Find a master upper device and return pointer to it or NULL in case | |
4570 | * it's not there. The caller must hold the RTNL lock. | |
4571 | */ | |
4572 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
4573 | { | |
aa9d8560 | 4574 | struct netdev_adjacent *upper; |
9ff162a8 JP |
4575 | |
4576 | ASSERT_RTNL(); | |
4577 | ||
2f268f12 | 4578 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
4579 | return NULL; |
4580 | ||
2f268f12 | 4581 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 4582 | struct netdev_adjacent, list); |
9ff162a8 JP |
4583 | if (likely(upper->master)) |
4584 | return upper->dev; | |
4585 | return NULL; | |
4586 | } | |
4587 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
4588 | ||
b6ccba4c VF |
4589 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
4590 | { | |
4591 | struct netdev_adjacent *adj; | |
4592 | ||
4593 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
4594 | ||
4595 | return adj->private; | |
4596 | } | |
4597 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
4598 | ||
44a40855 VY |
4599 | /** |
4600 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
4601 | * @dev: device | |
4602 | * @iter: list_head ** of the current position | |
4603 | * | |
4604 | * Gets the next device from the dev's upper list, starting from iter | |
4605 | * position. The caller must hold RCU read lock. | |
4606 | */ | |
4607 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
4608 | struct list_head **iter) | |
4609 | { | |
4610 | struct netdev_adjacent *upper; | |
4611 | ||
4612 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
4613 | ||
4614 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4615 | ||
4616 | if (&upper->list == &dev->adj_list.upper) | |
4617 | return NULL; | |
4618 | ||
4619 | *iter = &upper->list; | |
4620 | ||
4621 | return upper->dev; | |
4622 | } | |
4623 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
4624 | ||
31088a11 VF |
4625 | /** |
4626 | * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list | |
48311f46 VF |
4627 | * @dev: device |
4628 | * @iter: list_head ** of the current position | |
4629 | * | |
4630 | * Gets the next device from the dev's upper list, starting from iter | |
4631 | * position. The caller must hold RCU read lock. | |
4632 | */ | |
2f268f12 VF |
4633 | struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, |
4634 | struct list_head **iter) | |
48311f46 VF |
4635 | { |
4636 | struct netdev_adjacent *upper; | |
4637 | ||
85328240 | 4638 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
48311f46 VF |
4639 | |
4640 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4641 | ||
2f268f12 | 4642 | if (&upper->list == &dev->all_adj_list.upper) |
48311f46 VF |
4643 | return NULL; |
4644 | ||
4645 | *iter = &upper->list; | |
4646 | ||
4647 | return upper->dev; | |
4648 | } | |
2f268f12 | 4649 | EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu); |
48311f46 | 4650 | |
31088a11 VF |
4651 | /** |
4652 | * netdev_lower_get_next_private - Get the next ->private from the | |
4653 | * lower neighbour list | |
4654 | * @dev: device | |
4655 | * @iter: list_head ** of the current position | |
4656 | * | |
4657 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
4658 | * list, starting from iter position. The caller must hold either hold the | |
4659 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
4660 | * list will remain unchainged. | |
4661 | */ | |
4662 | void *netdev_lower_get_next_private(struct net_device *dev, | |
4663 | struct list_head **iter) | |
4664 | { | |
4665 | struct netdev_adjacent *lower; | |
4666 | ||
4667 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
4668 | ||
4669 | if (&lower->list == &dev->adj_list.lower) | |
4670 | return NULL; | |
4671 | ||
6859e7df | 4672 | *iter = lower->list.next; |
31088a11 VF |
4673 | |
4674 | return lower->private; | |
4675 | } | |
4676 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
4677 | ||
4678 | /** | |
4679 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
4680 | * lower neighbour list, RCU | |
4681 | * variant | |
4682 | * @dev: device | |
4683 | * @iter: list_head ** of the current position | |
4684 | * | |
4685 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
4686 | * list, starting from iter position. The caller must hold RCU read lock. | |
4687 | */ | |
4688 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
4689 | struct list_head **iter) | |
4690 | { | |
4691 | struct netdev_adjacent *lower; | |
4692 | ||
4693 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
4694 | ||
4695 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4696 | ||
4697 | if (&lower->list == &dev->adj_list.lower) | |
4698 | return NULL; | |
4699 | ||
6859e7df | 4700 | *iter = &lower->list; |
31088a11 VF |
4701 | |
4702 | return lower->private; | |
4703 | } | |
4704 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
4705 | ||
4085ebe8 VY |
4706 | /** |
4707 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
4708 | * list | |
4709 | * @dev: device | |
4710 | * @iter: list_head ** of the current position | |
4711 | * | |
4712 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
4713 | * list, starting from iter position. The caller must hold RTNL lock or | |
4714 | * its own locking that guarantees that the neighbour lower | |
4715 | * list will remain unchainged. | |
4716 | */ | |
4717 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
4718 | { | |
4719 | struct netdev_adjacent *lower; | |
4720 | ||
4721 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); | |
4722 | ||
4723 | if (&lower->list == &dev->adj_list.lower) | |
4724 | return NULL; | |
4725 | ||
4726 | *iter = &lower->list; | |
4727 | ||
4728 | return lower->dev; | |
4729 | } | |
4730 | EXPORT_SYMBOL(netdev_lower_get_next); | |
4731 | ||
e001bfad | 4732 | /** |
4733 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
4734 | * lower neighbour list, RCU | |
4735 | * variant | |
4736 | * @dev: device | |
4737 | * | |
4738 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
4739 | * list. The caller must hold RCU read lock. | |
4740 | */ | |
4741 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
4742 | { | |
4743 | struct netdev_adjacent *lower; | |
4744 | ||
4745 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
4746 | struct netdev_adjacent, list); | |
4747 | if (lower) | |
4748 | return lower->private; | |
4749 | return NULL; | |
4750 | } | |
4751 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
4752 | ||
9ff162a8 JP |
4753 | /** |
4754 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
4755 | * @dev: device | |
4756 | * | |
4757 | * Find a master upper device and return pointer to it or NULL in case | |
4758 | * it's not there. The caller must hold the RCU read lock. | |
4759 | */ | |
4760 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
4761 | { | |
aa9d8560 | 4762 | struct netdev_adjacent *upper; |
9ff162a8 | 4763 | |
2f268f12 | 4764 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 4765 | struct netdev_adjacent, list); |
9ff162a8 JP |
4766 | if (upper && likely(upper->master)) |
4767 | return upper->dev; | |
4768 | return NULL; | |
4769 | } | |
4770 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
4771 | ||
0a59f3a9 | 4772 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
4773 | struct net_device *adj_dev, |
4774 | struct list_head *dev_list) | |
4775 | { | |
4776 | char linkname[IFNAMSIZ+7]; | |
4777 | sprintf(linkname, dev_list == &dev->adj_list.upper ? | |
4778 | "upper_%s" : "lower_%s", adj_dev->name); | |
4779 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
4780 | linkname); | |
4781 | } | |
0a59f3a9 | 4782 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
4783 | char *name, |
4784 | struct list_head *dev_list) | |
4785 | { | |
4786 | char linkname[IFNAMSIZ+7]; | |
4787 | sprintf(linkname, dev_list == &dev->adj_list.upper ? | |
4788 | "upper_%s" : "lower_%s", name); | |
4789 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
4790 | } | |
4791 | ||
4792 | #define netdev_adjacent_is_neigh_list(dev, dev_list) \ | |
4793 | (dev_list == &dev->adj_list.upper || \ | |
4794 | dev_list == &dev->adj_list.lower) | |
4795 | ||
5d261913 VF |
4796 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
4797 | struct net_device *adj_dev, | |
7863c054 | 4798 | struct list_head *dev_list, |
402dae96 | 4799 | void *private, bool master) |
5d261913 VF |
4800 | { |
4801 | struct netdev_adjacent *adj; | |
842d67a7 | 4802 | int ret; |
5d261913 | 4803 | |
7863c054 | 4804 | adj = __netdev_find_adj(dev, adj_dev, dev_list); |
5d261913 VF |
4805 | |
4806 | if (adj) { | |
5d261913 VF |
4807 | adj->ref_nr++; |
4808 | return 0; | |
4809 | } | |
4810 | ||
4811 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
4812 | if (!adj) | |
4813 | return -ENOMEM; | |
4814 | ||
4815 | adj->dev = adj_dev; | |
4816 | adj->master = master; | |
5d261913 | 4817 | adj->ref_nr = 1; |
402dae96 | 4818 | adj->private = private; |
5d261913 | 4819 | dev_hold(adj_dev); |
2f268f12 VF |
4820 | |
4821 | pr_debug("dev_hold for %s, because of link added from %s to %s\n", | |
4822 | adj_dev->name, dev->name, adj_dev->name); | |
5d261913 | 4823 | |
3ee32707 VF |
4824 | if (netdev_adjacent_is_neigh_list(dev, dev_list)) { |
4825 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); | |
5831d66e VF |
4826 | if (ret) |
4827 | goto free_adj; | |
4828 | } | |
4829 | ||
7863c054 | 4830 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
4831 | if (master) { |
4832 | ret = sysfs_create_link(&(dev->dev.kobj), | |
4833 | &(adj_dev->dev.kobj), "master"); | |
4834 | if (ret) | |
5831d66e | 4835 | goto remove_symlinks; |
842d67a7 | 4836 | |
7863c054 | 4837 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 4838 | } else { |
7863c054 | 4839 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 4840 | } |
5d261913 VF |
4841 | |
4842 | return 0; | |
842d67a7 | 4843 | |
5831d66e | 4844 | remove_symlinks: |
3ee32707 VF |
4845 | if (netdev_adjacent_is_neigh_list(dev, dev_list)) |
4846 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); | |
842d67a7 VF |
4847 | free_adj: |
4848 | kfree(adj); | |
974daef7 | 4849 | dev_put(adj_dev); |
842d67a7 VF |
4850 | |
4851 | return ret; | |
5d261913 VF |
4852 | } |
4853 | ||
1d143d9f | 4854 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
4855 | struct net_device *adj_dev, | |
4856 | struct list_head *dev_list) | |
5d261913 VF |
4857 | { |
4858 | struct netdev_adjacent *adj; | |
4859 | ||
7863c054 | 4860 | adj = __netdev_find_adj(dev, adj_dev, dev_list); |
5d261913 | 4861 | |
2f268f12 VF |
4862 | if (!adj) { |
4863 | pr_err("tried to remove device %s from %s\n", | |
4864 | dev->name, adj_dev->name); | |
5d261913 | 4865 | BUG(); |
2f268f12 | 4866 | } |
5d261913 VF |
4867 | |
4868 | if (adj->ref_nr > 1) { | |
2f268f12 VF |
4869 | pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name, |
4870 | adj->ref_nr-1); | |
5d261913 VF |
4871 | adj->ref_nr--; |
4872 | return; | |
4873 | } | |
4874 | ||
842d67a7 VF |
4875 | if (adj->master) |
4876 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
4877 | ||
3ee32707 VF |
4878 | if (netdev_adjacent_is_neigh_list(dev, dev_list)) |
4879 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); | |
5831d66e | 4880 | |
5d261913 | 4881 | list_del_rcu(&adj->list); |
2f268f12 VF |
4882 | pr_debug("dev_put for %s, because link removed from %s to %s\n", |
4883 | adj_dev->name, dev->name, adj_dev->name); | |
5d261913 VF |
4884 | dev_put(adj_dev); |
4885 | kfree_rcu(adj, rcu); | |
4886 | } | |
4887 | ||
1d143d9f | 4888 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
4889 | struct net_device *upper_dev, | |
4890 | struct list_head *up_list, | |
4891 | struct list_head *down_list, | |
4892 | void *private, bool master) | |
5d261913 VF |
4893 | { |
4894 | int ret; | |
4895 | ||
402dae96 VF |
4896 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private, |
4897 | master); | |
5d261913 VF |
4898 | if (ret) |
4899 | return ret; | |
4900 | ||
402dae96 VF |
4901 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private, |
4902 | false); | |
5d261913 | 4903 | if (ret) { |
2f268f12 | 4904 | __netdev_adjacent_dev_remove(dev, upper_dev, up_list); |
5d261913 VF |
4905 | return ret; |
4906 | } | |
4907 | ||
4908 | return 0; | |
4909 | } | |
4910 | ||
1d143d9f | 4911 | static int __netdev_adjacent_dev_link(struct net_device *dev, |
4912 | struct net_device *upper_dev) | |
5d261913 | 4913 | { |
2f268f12 VF |
4914 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
4915 | &dev->all_adj_list.upper, | |
4916 | &upper_dev->all_adj_list.lower, | |
402dae96 | 4917 | NULL, false); |
5d261913 VF |
4918 | } |
4919 | ||
1d143d9f | 4920 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
4921 | struct net_device *upper_dev, | |
4922 | struct list_head *up_list, | |
4923 | struct list_head *down_list) | |
5d261913 | 4924 | { |
2f268f12 VF |
4925 | __netdev_adjacent_dev_remove(dev, upper_dev, up_list); |
4926 | __netdev_adjacent_dev_remove(upper_dev, dev, down_list); | |
5d261913 VF |
4927 | } |
4928 | ||
1d143d9f | 4929 | static void __netdev_adjacent_dev_unlink(struct net_device *dev, |
4930 | struct net_device *upper_dev) | |
5d261913 | 4931 | { |
2f268f12 VF |
4932 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, |
4933 | &dev->all_adj_list.upper, | |
4934 | &upper_dev->all_adj_list.lower); | |
4935 | } | |
4936 | ||
1d143d9f | 4937 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
4938 | struct net_device *upper_dev, | |
4939 | void *private, bool master) | |
2f268f12 VF |
4940 | { |
4941 | int ret = __netdev_adjacent_dev_link(dev, upper_dev); | |
4942 | ||
4943 | if (ret) | |
4944 | return ret; | |
4945 | ||
4946 | ret = __netdev_adjacent_dev_link_lists(dev, upper_dev, | |
4947 | &dev->adj_list.upper, | |
4948 | &upper_dev->adj_list.lower, | |
402dae96 | 4949 | private, master); |
2f268f12 VF |
4950 | if (ret) { |
4951 | __netdev_adjacent_dev_unlink(dev, upper_dev); | |
4952 | return ret; | |
4953 | } | |
4954 | ||
4955 | return 0; | |
5d261913 VF |
4956 | } |
4957 | ||
1d143d9f | 4958 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
4959 | struct net_device *upper_dev) | |
2f268f12 VF |
4960 | { |
4961 | __netdev_adjacent_dev_unlink(dev, upper_dev); | |
4962 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, | |
4963 | &dev->adj_list.upper, | |
4964 | &upper_dev->adj_list.lower); | |
4965 | } | |
5d261913 | 4966 | |
9ff162a8 | 4967 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 VF |
4968 | struct net_device *upper_dev, bool master, |
4969 | void *private) | |
9ff162a8 | 4970 | { |
5d261913 VF |
4971 | struct netdev_adjacent *i, *j, *to_i, *to_j; |
4972 | int ret = 0; | |
9ff162a8 JP |
4973 | |
4974 | ASSERT_RTNL(); | |
4975 | ||
4976 | if (dev == upper_dev) | |
4977 | return -EBUSY; | |
4978 | ||
4979 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
2f268f12 | 4980 | if (__netdev_find_adj(upper_dev, dev, &upper_dev->all_adj_list.upper)) |
9ff162a8 JP |
4981 | return -EBUSY; |
4982 | ||
2f268f12 | 4983 | if (__netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper)) |
9ff162a8 JP |
4984 | return -EEXIST; |
4985 | ||
4986 | if (master && netdev_master_upper_dev_get(dev)) | |
4987 | return -EBUSY; | |
4988 | ||
402dae96 VF |
4989 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private, |
4990 | master); | |
5d261913 VF |
4991 | if (ret) |
4992 | return ret; | |
9ff162a8 | 4993 | |
5d261913 | 4994 | /* Now that we linked these devs, make all the upper_dev's |
2f268f12 | 4995 | * all_adj_list.upper visible to every dev's all_adj_list.lower an |
5d261913 VF |
4996 | * versa, and don't forget the devices itself. All of these |
4997 | * links are non-neighbours. | |
4998 | */ | |
2f268f12 VF |
4999 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5000 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { | |
5001 | pr_debug("Interlinking %s with %s, non-neighbour\n", | |
5002 | i->dev->name, j->dev->name); | |
5d261913 VF |
5003 | ret = __netdev_adjacent_dev_link(i->dev, j->dev); |
5004 | if (ret) | |
5005 | goto rollback_mesh; | |
5006 | } | |
5007 | } | |
5008 | ||
5009 | /* add dev to every upper_dev's upper device */ | |
2f268f12 VF |
5010 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { |
5011 | pr_debug("linking %s's upper device %s with %s\n", | |
5012 | upper_dev->name, i->dev->name, dev->name); | |
5d261913 VF |
5013 | ret = __netdev_adjacent_dev_link(dev, i->dev); |
5014 | if (ret) | |
5015 | goto rollback_upper_mesh; | |
5016 | } | |
5017 | ||
5018 | /* add upper_dev to every dev's lower device */ | |
2f268f12 VF |
5019 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5020 | pr_debug("linking %s's lower device %s with %s\n", dev->name, | |
5021 | i->dev->name, upper_dev->name); | |
5d261913 VF |
5022 | ret = __netdev_adjacent_dev_link(i->dev, upper_dev); |
5023 | if (ret) | |
5024 | goto rollback_lower_mesh; | |
5025 | } | |
9ff162a8 | 5026 | |
42e52bf9 | 5027 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
9ff162a8 | 5028 | return 0; |
5d261913 VF |
5029 | |
5030 | rollback_lower_mesh: | |
5031 | to_i = i; | |
2f268f12 | 5032 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5d261913 VF |
5033 | if (i == to_i) |
5034 | break; | |
5035 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); | |
5036 | } | |
5037 | ||
5038 | i = NULL; | |
5039 | ||
5040 | rollback_upper_mesh: | |
5041 | to_i = i; | |
2f268f12 | 5042 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { |
5d261913 VF |
5043 | if (i == to_i) |
5044 | break; | |
5045 | __netdev_adjacent_dev_unlink(dev, i->dev); | |
5046 | } | |
5047 | ||
5048 | i = j = NULL; | |
5049 | ||
5050 | rollback_mesh: | |
5051 | to_i = i; | |
5052 | to_j = j; | |
2f268f12 VF |
5053 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5054 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { | |
5d261913 VF |
5055 | if (i == to_i && j == to_j) |
5056 | break; | |
5057 | __netdev_adjacent_dev_unlink(i->dev, j->dev); | |
5058 | } | |
5059 | if (i == to_i) | |
5060 | break; | |
5061 | } | |
5062 | ||
2f268f12 | 5063 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
5064 | |
5065 | return ret; | |
9ff162a8 JP |
5066 | } |
5067 | ||
5068 | /** | |
5069 | * netdev_upper_dev_link - Add a link to the upper device | |
5070 | * @dev: device | |
5071 | * @upper_dev: new upper device | |
5072 | * | |
5073 | * Adds a link to device which is upper to this one. The caller must hold | |
5074 | * the RTNL lock. On a failure a negative errno code is returned. | |
5075 | * On success the reference counts are adjusted and the function | |
5076 | * returns zero. | |
5077 | */ | |
5078 | int netdev_upper_dev_link(struct net_device *dev, | |
5079 | struct net_device *upper_dev) | |
5080 | { | |
402dae96 | 5081 | return __netdev_upper_dev_link(dev, upper_dev, false, NULL); |
9ff162a8 JP |
5082 | } |
5083 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
5084 | ||
5085 | /** | |
5086 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
5087 | * @dev: device | |
5088 | * @upper_dev: new upper device | |
5089 | * | |
5090 | * Adds a link to device which is upper to this one. In this case, only | |
5091 | * one master upper device can be linked, although other non-master devices | |
5092 | * might be linked as well. The caller must hold the RTNL lock. | |
5093 | * On a failure a negative errno code is returned. On success the reference | |
5094 | * counts are adjusted and the function returns zero. | |
5095 | */ | |
5096 | int netdev_master_upper_dev_link(struct net_device *dev, | |
5097 | struct net_device *upper_dev) | |
5098 | { | |
402dae96 | 5099 | return __netdev_upper_dev_link(dev, upper_dev, true, NULL); |
9ff162a8 JP |
5100 | } |
5101 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
5102 | ||
402dae96 VF |
5103 | int netdev_master_upper_dev_link_private(struct net_device *dev, |
5104 | struct net_device *upper_dev, | |
5105 | void *private) | |
5106 | { | |
5107 | return __netdev_upper_dev_link(dev, upper_dev, true, private); | |
5108 | } | |
5109 | EXPORT_SYMBOL(netdev_master_upper_dev_link_private); | |
5110 | ||
9ff162a8 JP |
5111 | /** |
5112 | * netdev_upper_dev_unlink - Removes a link to upper device | |
5113 | * @dev: device | |
5114 | * @upper_dev: new upper device | |
5115 | * | |
5116 | * Removes a link to device which is upper to this one. The caller must hold | |
5117 | * the RTNL lock. | |
5118 | */ | |
5119 | void netdev_upper_dev_unlink(struct net_device *dev, | |
5120 | struct net_device *upper_dev) | |
5121 | { | |
5d261913 | 5122 | struct netdev_adjacent *i, *j; |
9ff162a8 JP |
5123 | ASSERT_RTNL(); |
5124 | ||
2f268f12 | 5125 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
5126 | |
5127 | /* Here is the tricky part. We must remove all dev's lower | |
5128 | * devices from all upper_dev's upper devices and vice | |
5129 | * versa, to maintain the graph relationship. | |
5130 | */ | |
2f268f12 VF |
5131 | list_for_each_entry(i, &dev->all_adj_list.lower, list) |
5132 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) | |
5d261913 VF |
5133 | __netdev_adjacent_dev_unlink(i->dev, j->dev); |
5134 | ||
5135 | /* remove also the devices itself from lower/upper device | |
5136 | * list | |
5137 | */ | |
2f268f12 | 5138 | list_for_each_entry(i, &dev->all_adj_list.lower, list) |
5d261913 VF |
5139 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); |
5140 | ||
2f268f12 | 5141 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) |
5d261913 VF |
5142 | __netdev_adjacent_dev_unlink(dev, i->dev); |
5143 | ||
42e52bf9 | 5144 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
9ff162a8 JP |
5145 | } |
5146 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
5147 | ||
5bb025fa | 5148 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 5149 | { |
5bb025fa | 5150 | struct netdev_adjacent *iter; |
402dae96 | 5151 | |
5bb025fa VF |
5152 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
5153 | netdev_adjacent_sysfs_del(iter->dev, oldname, | |
5154 | &iter->dev->adj_list.lower); | |
5155 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5156 | &iter->dev->adj_list.lower); | |
5157 | } | |
402dae96 | 5158 | |
5bb025fa VF |
5159 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
5160 | netdev_adjacent_sysfs_del(iter->dev, oldname, | |
5161 | &iter->dev->adj_list.upper); | |
5162 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5163 | &iter->dev->adj_list.upper); | |
5164 | } | |
402dae96 | 5165 | } |
402dae96 VF |
5166 | |
5167 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
5168 | struct net_device *lower_dev) | |
5169 | { | |
5170 | struct netdev_adjacent *lower; | |
5171 | ||
5172 | if (!lower_dev) | |
5173 | return NULL; | |
5174 | lower = __netdev_find_adj(dev, lower_dev, &dev->adj_list.lower); | |
5175 | if (!lower) | |
5176 | return NULL; | |
5177 | ||
5178 | return lower->private; | |
5179 | } | |
5180 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
5181 | ||
4085ebe8 VY |
5182 | |
5183 | int dev_get_nest_level(struct net_device *dev, | |
5184 | bool (*type_check)(struct net_device *dev)) | |
5185 | { | |
5186 | struct net_device *lower = NULL; | |
5187 | struct list_head *iter; | |
5188 | int max_nest = -1; | |
5189 | int nest; | |
5190 | ||
5191 | ASSERT_RTNL(); | |
5192 | ||
5193 | netdev_for_each_lower_dev(dev, lower, iter) { | |
5194 | nest = dev_get_nest_level(lower, type_check); | |
5195 | if (max_nest < nest) | |
5196 | max_nest = nest; | |
5197 | } | |
5198 | ||
5199 | if (type_check(dev)) | |
5200 | max_nest++; | |
5201 | ||
5202 | return max_nest; | |
5203 | } | |
5204 | EXPORT_SYMBOL(dev_get_nest_level); | |
5205 | ||
b6c40d68 PM |
5206 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
5207 | { | |
d314774c SH |
5208 | const struct net_device_ops *ops = dev->netdev_ops; |
5209 | ||
d2615bf4 | 5210 | if (ops->ndo_change_rx_flags) |
d314774c | 5211 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
5212 | } |
5213 | ||
991fb3f7 | 5214 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 5215 | { |
b536db93 | 5216 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
5217 | kuid_t uid; |
5218 | kgid_t gid; | |
1da177e4 | 5219 | |
24023451 PM |
5220 | ASSERT_RTNL(); |
5221 | ||
dad9b335 WC |
5222 | dev->flags |= IFF_PROMISC; |
5223 | dev->promiscuity += inc; | |
5224 | if (dev->promiscuity == 0) { | |
5225 | /* | |
5226 | * Avoid overflow. | |
5227 | * If inc causes overflow, untouch promisc and return error. | |
5228 | */ | |
5229 | if (inc < 0) | |
5230 | dev->flags &= ~IFF_PROMISC; | |
5231 | else { | |
5232 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
5233 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
5234 | dev->name); | |
dad9b335 WC |
5235 | return -EOVERFLOW; |
5236 | } | |
5237 | } | |
52609c0b | 5238 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
5239 | pr_info("device %s %s promiscuous mode\n", |
5240 | dev->name, | |
5241 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
5242 | if (audit_enabled) { |
5243 | current_uid_gid(&uid, &gid); | |
7759db82 KHK |
5244 | audit_log(current->audit_context, GFP_ATOMIC, |
5245 | AUDIT_ANOM_PROMISCUOUS, | |
5246 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
5247 | dev->name, (dev->flags & IFF_PROMISC), | |
5248 | (old_flags & IFF_PROMISC), | |
e1760bd5 | 5249 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
d04a48b0 EB |
5250 | from_kuid(&init_user_ns, uid), |
5251 | from_kgid(&init_user_ns, gid), | |
7759db82 | 5252 | audit_get_sessionid(current)); |
8192b0c4 | 5253 | } |
24023451 | 5254 | |
b6c40d68 | 5255 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 5256 | } |
991fb3f7 ND |
5257 | if (notify) |
5258 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 5259 | return 0; |
1da177e4 LT |
5260 | } |
5261 | ||
4417da66 PM |
5262 | /** |
5263 | * dev_set_promiscuity - update promiscuity count on a device | |
5264 | * @dev: device | |
5265 | * @inc: modifier | |
5266 | * | |
5267 | * Add or remove promiscuity from a device. While the count in the device | |
5268 | * remains above zero the interface remains promiscuous. Once it hits zero | |
5269 | * the device reverts back to normal filtering operation. A negative inc | |
5270 | * value is used to drop promiscuity on the device. | |
dad9b335 | 5271 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 5272 | */ |
dad9b335 | 5273 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 5274 | { |
b536db93 | 5275 | unsigned int old_flags = dev->flags; |
dad9b335 | 5276 | int err; |
4417da66 | 5277 | |
991fb3f7 | 5278 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 5279 | if (err < 0) |
dad9b335 | 5280 | return err; |
4417da66 PM |
5281 | if (dev->flags != old_flags) |
5282 | dev_set_rx_mode(dev); | |
dad9b335 | 5283 | return err; |
4417da66 | 5284 | } |
d1b19dff | 5285 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 5286 | |
991fb3f7 | 5287 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 5288 | { |
991fb3f7 | 5289 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 5290 | |
24023451 PM |
5291 | ASSERT_RTNL(); |
5292 | ||
1da177e4 | 5293 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
5294 | dev->allmulti += inc; |
5295 | if (dev->allmulti == 0) { | |
5296 | /* | |
5297 | * Avoid overflow. | |
5298 | * If inc causes overflow, untouch allmulti and return error. | |
5299 | */ | |
5300 | if (inc < 0) | |
5301 | dev->flags &= ~IFF_ALLMULTI; | |
5302 | else { | |
5303 | dev->allmulti -= inc; | |
7b6cd1ce JP |
5304 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
5305 | dev->name); | |
dad9b335 WC |
5306 | return -EOVERFLOW; |
5307 | } | |
5308 | } | |
24023451 | 5309 | if (dev->flags ^ old_flags) { |
b6c40d68 | 5310 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 5311 | dev_set_rx_mode(dev); |
991fb3f7 ND |
5312 | if (notify) |
5313 | __dev_notify_flags(dev, old_flags, | |
5314 | dev->gflags ^ old_gflags); | |
24023451 | 5315 | } |
dad9b335 | 5316 | return 0; |
4417da66 | 5317 | } |
991fb3f7 ND |
5318 | |
5319 | /** | |
5320 | * dev_set_allmulti - update allmulti count on a device | |
5321 | * @dev: device | |
5322 | * @inc: modifier | |
5323 | * | |
5324 | * Add or remove reception of all multicast frames to a device. While the | |
5325 | * count in the device remains above zero the interface remains listening | |
5326 | * to all interfaces. Once it hits zero the device reverts back to normal | |
5327 | * filtering operation. A negative @inc value is used to drop the counter | |
5328 | * when releasing a resource needing all multicasts. | |
5329 | * Return 0 if successful or a negative errno code on error. | |
5330 | */ | |
5331 | ||
5332 | int dev_set_allmulti(struct net_device *dev, int inc) | |
5333 | { | |
5334 | return __dev_set_allmulti(dev, inc, true); | |
5335 | } | |
d1b19dff | 5336 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
5337 | |
5338 | /* | |
5339 | * Upload unicast and multicast address lists to device and | |
5340 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 5341 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
5342 | * are present. |
5343 | */ | |
5344 | void __dev_set_rx_mode(struct net_device *dev) | |
5345 | { | |
d314774c SH |
5346 | const struct net_device_ops *ops = dev->netdev_ops; |
5347 | ||
4417da66 PM |
5348 | /* dev_open will call this function so the list will stay sane. */ |
5349 | if (!(dev->flags&IFF_UP)) | |
5350 | return; | |
5351 | ||
5352 | if (!netif_device_present(dev)) | |
40b77c94 | 5353 | return; |
4417da66 | 5354 | |
01789349 | 5355 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
5356 | /* Unicast addresses changes may only happen under the rtnl, |
5357 | * therefore calling __dev_set_promiscuity here is safe. | |
5358 | */ | |
32e7bfc4 | 5359 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 5360 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 5361 | dev->uc_promisc = true; |
32e7bfc4 | 5362 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 5363 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 5364 | dev->uc_promisc = false; |
4417da66 | 5365 | } |
4417da66 | 5366 | } |
01789349 JP |
5367 | |
5368 | if (ops->ndo_set_rx_mode) | |
5369 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
5370 | } |
5371 | ||
5372 | void dev_set_rx_mode(struct net_device *dev) | |
5373 | { | |
b9e40857 | 5374 | netif_addr_lock_bh(dev); |
4417da66 | 5375 | __dev_set_rx_mode(dev); |
b9e40857 | 5376 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
5377 | } |
5378 | ||
f0db275a SH |
5379 | /** |
5380 | * dev_get_flags - get flags reported to userspace | |
5381 | * @dev: device | |
5382 | * | |
5383 | * Get the combination of flag bits exported through APIs to userspace. | |
5384 | */ | |
95c96174 | 5385 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 5386 | { |
95c96174 | 5387 | unsigned int flags; |
1da177e4 LT |
5388 | |
5389 | flags = (dev->flags & ~(IFF_PROMISC | | |
5390 | IFF_ALLMULTI | | |
b00055aa SR |
5391 | IFF_RUNNING | |
5392 | IFF_LOWER_UP | | |
5393 | IFF_DORMANT)) | | |
1da177e4 LT |
5394 | (dev->gflags & (IFF_PROMISC | |
5395 | IFF_ALLMULTI)); | |
5396 | ||
b00055aa SR |
5397 | if (netif_running(dev)) { |
5398 | if (netif_oper_up(dev)) | |
5399 | flags |= IFF_RUNNING; | |
5400 | if (netif_carrier_ok(dev)) | |
5401 | flags |= IFF_LOWER_UP; | |
5402 | if (netif_dormant(dev)) | |
5403 | flags |= IFF_DORMANT; | |
5404 | } | |
1da177e4 LT |
5405 | |
5406 | return flags; | |
5407 | } | |
d1b19dff | 5408 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 5409 | |
bd380811 | 5410 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
1da177e4 | 5411 | { |
b536db93 | 5412 | unsigned int old_flags = dev->flags; |
bd380811 | 5413 | int ret; |
1da177e4 | 5414 | |
24023451 PM |
5415 | ASSERT_RTNL(); |
5416 | ||
1da177e4 LT |
5417 | /* |
5418 | * Set the flags on our device. | |
5419 | */ | |
5420 | ||
5421 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
5422 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
5423 | IFF_AUTOMEDIA)) | | |
5424 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
5425 | IFF_ALLMULTI)); | |
5426 | ||
5427 | /* | |
5428 | * Load in the correct multicast list now the flags have changed. | |
5429 | */ | |
5430 | ||
b6c40d68 PM |
5431 | if ((old_flags ^ flags) & IFF_MULTICAST) |
5432 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 5433 | |
4417da66 | 5434 | dev_set_rx_mode(dev); |
1da177e4 LT |
5435 | |
5436 | /* | |
5437 | * Have we downed the interface. We handle IFF_UP ourselves | |
5438 | * according to user attempts to set it, rather than blindly | |
5439 | * setting it. | |
5440 | */ | |
5441 | ||
5442 | ret = 0; | |
5443 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ | |
bd380811 | 5444 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
1da177e4 LT |
5445 | |
5446 | if (!ret) | |
4417da66 | 5447 | dev_set_rx_mode(dev); |
1da177e4 LT |
5448 | } |
5449 | ||
1da177e4 | 5450 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 5451 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 5452 | unsigned int old_flags = dev->flags; |
d1b19dff | 5453 | |
1da177e4 | 5454 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
5455 | |
5456 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
5457 | if (dev->flags != old_flags) | |
5458 | dev_set_rx_mode(dev); | |
1da177e4 LT |
5459 | } |
5460 | ||
5461 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
5462 | is important. Some (broken) drivers set IFF_PROMISC, when | |
5463 | IFF_ALLMULTI is requested not asking us and not reporting. | |
5464 | */ | |
5465 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
5466 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
5467 | ||
1da177e4 | 5468 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 5469 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
5470 | } |
5471 | ||
bd380811 PM |
5472 | return ret; |
5473 | } | |
5474 | ||
a528c219 ND |
5475 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
5476 | unsigned int gchanges) | |
bd380811 PM |
5477 | { |
5478 | unsigned int changes = dev->flags ^ old_flags; | |
5479 | ||
a528c219 | 5480 | if (gchanges) |
7f294054 | 5481 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 5482 | |
bd380811 PM |
5483 | if (changes & IFF_UP) { |
5484 | if (dev->flags & IFF_UP) | |
5485 | call_netdevice_notifiers(NETDEV_UP, dev); | |
5486 | else | |
5487 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
5488 | } | |
5489 | ||
5490 | if (dev->flags & IFF_UP && | |
be9efd36 JP |
5491 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
5492 | struct netdev_notifier_change_info change_info; | |
5493 | ||
5494 | change_info.flags_changed = changes; | |
5495 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
5496 | &change_info.info); | |
5497 | } | |
bd380811 PM |
5498 | } |
5499 | ||
5500 | /** | |
5501 | * dev_change_flags - change device settings | |
5502 | * @dev: device | |
5503 | * @flags: device state flags | |
5504 | * | |
5505 | * Change settings on device based state flags. The flags are | |
5506 | * in the userspace exported format. | |
5507 | */ | |
b536db93 | 5508 | int dev_change_flags(struct net_device *dev, unsigned int flags) |
bd380811 | 5509 | { |
b536db93 | 5510 | int ret; |
991fb3f7 | 5511 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 PM |
5512 | |
5513 | ret = __dev_change_flags(dev, flags); | |
5514 | if (ret < 0) | |
5515 | return ret; | |
5516 | ||
991fb3f7 | 5517 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 5518 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
5519 | return ret; |
5520 | } | |
d1b19dff | 5521 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 5522 | |
2315dc91 VF |
5523 | static int __dev_set_mtu(struct net_device *dev, int new_mtu) |
5524 | { | |
5525 | const struct net_device_ops *ops = dev->netdev_ops; | |
5526 | ||
5527 | if (ops->ndo_change_mtu) | |
5528 | return ops->ndo_change_mtu(dev, new_mtu); | |
5529 | ||
5530 | dev->mtu = new_mtu; | |
5531 | return 0; | |
5532 | } | |
5533 | ||
f0db275a SH |
5534 | /** |
5535 | * dev_set_mtu - Change maximum transfer unit | |
5536 | * @dev: device | |
5537 | * @new_mtu: new transfer unit | |
5538 | * | |
5539 | * Change the maximum transfer size of the network device. | |
5540 | */ | |
1da177e4 LT |
5541 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
5542 | { | |
2315dc91 | 5543 | int err, orig_mtu; |
1da177e4 LT |
5544 | |
5545 | if (new_mtu == dev->mtu) | |
5546 | return 0; | |
5547 | ||
5548 | /* MTU must be positive. */ | |
5549 | if (new_mtu < 0) | |
5550 | return -EINVAL; | |
5551 | ||
5552 | if (!netif_device_present(dev)) | |
5553 | return -ENODEV; | |
5554 | ||
1d486bfb VF |
5555 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
5556 | err = notifier_to_errno(err); | |
5557 | if (err) | |
5558 | return err; | |
d314774c | 5559 | |
2315dc91 VF |
5560 | orig_mtu = dev->mtu; |
5561 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 5562 | |
2315dc91 VF |
5563 | if (!err) { |
5564 | err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
5565 | err = notifier_to_errno(err); | |
5566 | if (err) { | |
5567 | /* setting mtu back and notifying everyone again, | |
5568 | * so that they have a chance to revert changes. | |
5569 | */ | |
5570 | __dev_set_mtu(dev, orig_mtu); | |
5571 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
5572 | } | |
5573 | } | |
1da177e4 LT |
5574 | return err; |
5575 | } | |
d1b19dff | 5576 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 5577 | |
cbda10fa VD |
5578 | /** |
5579 | * dev_set_group - Change group this device belongs to | |
5580 | * @dev: device | |
5581 | * @new_group: group this device should belong to | |
5582 | */ | |
5583 | void dev_set_group(struct net_device *dev, int new_group) | |
5584 | { | |
5585 | dev->group = new_group; | |
5586 | } | |
5587 | EXPORT_SYMBOL(dev_set_group); | |
5588 | ||
f0db275a SH |
5589 | /** |
5590 | * dev_set_mac_address - Change Media Access Control Address | |
5591 | * @dev: device | |
5592 | * @sa: new address | |
5593 | * | |
5594 | * Change the hardware (MAC) address of the device | |
5595 | */ | |
1da177e4 LT |
5596 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
5597 | { | |
d314774c | 5598 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
5599 | int err; |
5600 | ||
d314774c | 5601 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
5602 | return -EOPNOTSUPP; |
5603 | if (sa->sa_family != dev->type) | |
5604 | return -EINVAL; | |
5605 | if (!netif_device_present(dev)) | |
5606 | return -ENODEV; | |
d314774c | 5607 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
5608 | if (err) |
5609 | return err; | |
fbdeca2d | 5610 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 5611 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 5612 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 5613 | return 0; |
1da177e4 | 5614 | } |
d1b19dff | 5615 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 5616 | |
4bf84c35 JP |
5617 | /** |
5618 | * dev_change_carrier - Change device carrier | |
5619 | * @dev: device | |
691b3b7e | 5620 | * @new_carrier: new value |
4bf84c35 JP |
5621 | * |
5622 | * Change device carrier | |
5623 | */ | |
5624 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
5625 | { | |
5626 | const struct net_device_ops *ops = dev->netdev_ops; | |
5627 | ||
5628 | if (!ops->ndo_change_carrier) | |
5629 | return -EOPNOTSUPP; | |
5630 | if (!netif_device_present(dev)) | |
5631 | return -ENODEV; | |
5632 | return ops->ndo_change_carrier(dev, new_carrier); | |
5633 | } | |
5634 | EXPORT_SYMBOL(dev_change_carrier); | |
5635 | ||
66b52b0d JP |
5636 | /** |
5637 | * dev_get_phys_port_id - Get device physical port ID | |
5638 | * @dev: device | |
5639 | * @ppid: port ID | |
5640 | * | |
5641 | * Get device physical port ID | |
5642 | */ | |
5643 | int dev_get_phys_port_id(struct net_device *dev, | |
5644 | struct netdev_phys_port_id *ppid) | |
5645 | { | |
5646 | const struct net_device_ops *ops = dev->netdev_ops; | |
5647 | ||
5648 | if (!ops->ndo_get_phys_port_id) | |
5649 | return -EOPNOTSUPP; | |
5650 | return ops->ndo_get_phys_port_id(dev, ppid); | |
5651 | } | |
5652 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
5653 | ||
1da177e4 LT |
5654 | /** |
5655 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 5656 | * @net: the applicable net namespace |
1da177e4 LT |
5657 | * |
5658 | * Returns a suitable unique value for a new device interface | |
5659 | * number. The caller must hold the rtnl semaphore or the | |
5660 | * dev_base_lock to be sure it remains unique. | |
5661 | */ | |
881d966b | 5662 | static int dev_new_index(struct net *net) |
1da177e4 | 5663 | { |
aa79e66e | 5664 | int ifindex = net->ifindex; |
1da177e4 LT |
5665 | for (;;) { |
5666 | if (++ifindex <= 0) | |
5667 | ifindex = 1; | |
881d966b | 5668 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 5669 | return net->ifindex = ifindex; |
1da177e4 LT |
5670 | } |
5671 | } | |
5672 | ||
1da177e4 | 5673 | /* Delayed registration/unregisteration */ |
3b5b34fd | 5674 | static LIST_HEAD(net_todo_list); |
200b916f | 5675 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 5676 | |
6f05f629 | 5677 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 5678 | { |
1da177e4 | 5679 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 5680 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
5681 | } |
5682 | ||
9b5e383c | 5683 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 5684 | { |
e93737b0 | 5685 | struct net_device *dev, *tmp; |
5cde2829 | 5686 | LIST_HEAD(close_head); |
9b5e383c | 5687 | |
93ee31f1 DL |
5688 | BUG_ON(dev_boot_phase); |
5689 | ASSERT_RTNL(); | |
5690 | ||
e93737b0 | 5691 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 5692 | /* Some devices call without registering |
e93737b0 KK |
5693 | * for initialization unwind. Remove those |
5694 | * devices and proceed with the remaining. | |
9b5e383c ED |
5695 | */ |
5696 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
7b6cd1ce JP |
5697 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
5698 | dev->name, dev); | |
93ee31f1 | 5699 | |
9b5e383c | 5700 | WARN_ON(1); |
e93737b0 KK |
5701 | list_del(&dev->unreg_list); |
5702 | continue; | |
9b5e383c | 5703 | } |
449f4544 | 5704 | dev->dismantle = true; |
9b5e383c | 5705 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 5706 | } |
93ee31f1 | 5707 | |
44345724 | 5708 | /* If device is running, close it first. */ |
5cde2829 EB |
5709 | list_for_each_entry(dev, head, unreg_list) |
5710 | list_add_tail(&dev->close_list, &close_head); | |
5711 | dev_close_many(&close_head); | |
93ee31f1 | 5712 | |
44345724 | 5713 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
5714 | /* And unlink it from device chain. */ |
5715 | unlist_netdevice(dev); | |
93ee31f1 | 5716 | |
9b5e383c ED |
5717 | dev->reg_state = NETREG_UNREGISTERING; |
5718 | } | |
93ee31f1 DL |
5719 | |
5720 | synchronize_net(); | |
5721 | ||
9b5e383c ED |
5722 | list_for_each_entry(dev, head, unreg_list) { |
5723 | /* Shutdown queueing discipline. */ | |
5724 | dev_shutdown(dev); | |
93ee31f1 DL |
5725 | |
5726 | ||
9b5e383c ED |
5727 | /* Notify protocols, that we are about to destroy |
5728 | this device. They should clean all the things. | |
5729 | */ | |
5730 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
93ee31f1 | 5731 | |
9b5e383c ED |
5732 | /* |
5733 | * Flush the unicast and multicast chains | |
5734 | */ | |
a748ee24 | 5735 | dev_uc_flush(dev); |
22bedad3 | 5736 | dev_mc_flush(dev); |
93ee31f1 | 5737 | |
9b5e383c ED |
5738 | if (dev->netdev_ops->ndo_uninit) |
5739 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 5740 | |
56bfa7ee RP |
5741 | if (!dev->rtnl_link_ops || |
5742 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
5743 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); | |
5744 | ||
9ff162a8 JP |
5745 | /* Notifier chain MUST detach us all upper devices. */ |
5746 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
93ee31f1 | 5747 | |
9b5e383c ED |
5748 | /* Remove entries from kobject tree */ |
5749 | netdev_unregister_kobject(dev); | |
024e9679 AD |
5750 | #ifdef CONFIG_XPS |
5751 | /* Remove XPS queueing entries */ | |
5752 | netif_reset_xps_queues_gt(dev, 0); | |
5753 | #endif | |
9b5e383c | 5754 | } |
93ee31f1 | 5755 | |
850a545b | 5756 | synchronize_net(); |
395264d5 | 5757 | |
a5ee1551 | 5758 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
5759 | dev_put(dev); |
5760 | } | |
5761 | ||
5762 | static void rollback_registered(struct net_device *dev) | |
5763 | { | |
5764 | LIST_HEAD(single); | |
5765 | ||
5766 | list_add(&dev->unreg_list, &single); | |
5767 | rollback_registered_many(&single); | |
ceaaec98 | 5768 | list_del(&single); |
93ee31f1 DL |
5769 | } |
5770 | ||
c8f44aff MM |
5771 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
5772 | netdev_features_t features) | |
b63365a2 | 5773 | { |
57422dc5 MM |
5774 | /* Fix illegal checksum combinations */ |
5775 | if ((features & NETIF_F_HW_CSUM) && | |
5776 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 5777 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
5778 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
5779 | } | |
5780 | ||
b63365a2 | 5781 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 5782 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 5783 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 5784 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
5785 | } |
5786 | ||
ec5f0615 PS |
5787 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
5788 | !(features & NETIF_F_IP_CSUM)) { | |
5789 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
5790 | features &= ~NETIF_F_TSO; | |
5791 | features &= ~NETIF_F_TSO_ECN; | |
5792 | } | |
5793 | ||
5794 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
5795 | !(features & NETIF_F_IPV6_CSUM)) { | |
5796 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
5797 | features &= ~NETIF_F_TSO6; | |
5798 | } | |
5799 | ||
31d8b9e0 BH |
5800 | /* TSO ECN requires that TSO is present as well. */ |
5801 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
5802 | features &= ~NETIF_F_TSO_ECN; | |
5803 | ||
212b573f MM |
5804 | /* Software GSO depends on SG. */ |
5805 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 5806 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
5807 | features &= ~NETIF_F_GSO; |
5808 | } | |
5809 | ||
acd1130e | 5810 | /* UFO needs SG and checksumming */ |
b63365a2 | 5811 | if (features & NETIF_F_UFO) { |
79032644 MM |
5812 | /* maybe split UFO into V4 and V6? */ |
5813 | if (!((features & NETIF_F_GEN_CSUM) || | |
5814 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) | |
5815 | == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 5816 | netdev_dbg(dev, |
acd1130e | 5817 | "Dropping NETIF_F_UFO since no checksum offload features.\n"); |
b63365a2 HX |
5818 | features &= ~NETIF_F_UFO; |
5819 | } | |
5820 | ||
5821 | if (!(features & NETIF_F_SG)) { | |
6f404e44 | 5822 | netdev_dbg(dev, |
acd1130e | 5823 | "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n"); |
b63365a2 HX |
5824 | features &= ~NETIF_F_UFO; |
5825 | } | |
5826 | } | |
5827 | ||
d0290214 JP |
5828 | #ifdef CONFIG_NET_RX_BUSY_POLL |
5829 | if (dev->netdev_ops->ndo_busy_poll) | |
5830 | features |= NETIF_F_BUSY_POLL; | |
5831 | else | |
5832 | #endif | |
5833 | features &= ~NETIF_F_BUSY_POLL; | |
5834 | ||
b63365a2 HX |
5835 | return features; |
5836 | } | |
b63365a2 | 5837 | |
6cb6a27c | 5838 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 5839 | { |
c8f44aff | 5840 | netdev_features_t features; |
5455c699 MM |
5841 | int err = 0; |
5842 | ||
87267485 MM |
5843 | ASSERT_RTNL(); |
5844 | ||
5455c699 MM |
5845 | features = netdev_get_wanted_features(dev); |
5846 | ||
5847 | if (dev->netdev_ops->ndo_fix_features) | |
5848 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
5849 | ||
5850 | /* driver might be less strict about feature dependencies */ | |
5851 | features = netdev_fix_features(dev, features); | |
5852 | ||
5853 | if (dev->features == features) | |
6cb6a27c | 5854 | return 0; |
5455c699 | 5855 | |
c8f44aff MM |
5856 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
5857 | &dev->features, &features); | |
5455c699 MM |
5858 | |
5859 | if (dev->netdev_ops->ndo_set_features) | |
5860 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
5861 | ||
6cb6a27c | 5862 | if (unlikely(err < 0)) { |
5455c699 | 5863 | netdev_err(dev, |
c8f44aff MM |
5864 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
5865 | err, &features, &dev->features); | |
6cb6a27c MM |
5866 | return -1; |
5867 | } | |
5868 | ||
5869 | if (!err) | |
5870 | dev->features = features; | |
5871 | ||
5872 | return 1; | |
5873 | } | |
5874 | ||
afe12cc8 MM |
5875 | /** |
5876 | * netdev_update_features - recalculate device features | |
5877 | * @dev: the device to check | |
5878 | * | |
5879 | * Recalculate dev->features set and send notifications if it | |
5880 | * has changed. Should be called after driver or hardware dependent | |
5881 | * conditions might have changed that influence the features. | |
5882 | */ | |
6cb6a27c MM |
5883 | void netdev_update_features(struct net_device *dev) |
5884 | { | |
5885 | if (__netdev_update_features(dev)) | |
5886 | netdev_features_change(dev); | |
5455c699 MM |
5887 | } |
5888 | EXPORT_SYMBOL(netdev_update_features); | |
5889 | ||
afe12cc8 MM |
5890 | /** |
5891 | * netdev_change_features - recalculate device features | |
5892 | * @dev: the device to check | |
5893 | * | |
5894 | * Recalculate dev->features set and send notifications even | |
5895 | * if they have not changed. Should be called instead of | |
5896 | * netdev_update_features() if also dev->vlan_features might | |
5897 | * have changed to allow the changes to be propagated to stacked | |
5898 | * VLAN devices. | |
5899 | */ | |
5900 | void netdev_change_features(struct net_device *dev) | |
5901 | { | |
5902 | __netdev_update_features(dev); | |
5903 | netdev_features_change(dev); | |
5904 | } | |
5905 | EXPORT_SYMBOL(netdev_change_features); | |
5906 | ||
fc4a7489 PM |
5907 | /** |
5908 | * netif_stacked_transfer_operstate - transfer operstate | |
5909 | * @rootdev: the root or lower level device to transfer state from | |
5910 | * @dev: the device to transfer operstate to | |
5911 | * | |
5912 | * Transfer operational state from root to device. This is normally | |
5913 | * called when a stacking relationship exists between the root | |
5914 | * device and the device(a leaf device). | |
5915 | */ | |
5916 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
5917 | struct net_device *dev) | |
5918 | { | |
5919 | if (rootdev->operstate == IF_OPER_DORMANT) | |
5920 | netif_dormant_on(dev); | |
5921 | else | |
5922 | netif_dormant_off(dev); | |
5923 | ||
5924 | if (netif_carrier_ok(rootdev)) { | |
5925 | if (!netif_carrier_ok(dev)) | |
5926 | netif_carrier_on(dev); | |
5927 | } else { | |
5928 | if (netif_carrier_ok(dev)) | |
5929 | netif_carrier_off(dev); | |
5930 | } | |
5931 | } | |
5932 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
5933 | ||
a953be53 | 5934 | #ifdef CONFIG_SYSFS |
1b4bf461 ED |
5935 | static int netif_alloc_rx_queues(struct net_device *dev) |
5936 | { | |
1b4bf461 | 5937 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 5938 | struct netdev_rx_queue *rx; |
1b4bf461 | 5939 | |
bd25fa7b | 5940 | BUG_ON(count < 1); |
1b4bf461 | 5941 | |
bd25fa7b | 5942 | rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL); |
62b5942a | 5943 | if (!rx) |
bd25fa7b | 5944 | return -ENOMEM; |
62b5942a | 5945 | |
bd25fa7b TH |
5946 | dev->_rx = rx; |
5947 | ||
bd25fa7b | 5948 | for (i = 0; i < count; i++) |
fe822240 | 5949 | rx[i].dev = dev; |
1b4bf461 ED |
5950 | return 0; |
5951 | } | |
bf264145 | 5952 | #endif |
1b4bf461 | 5953 | |
aa942104 CG |
5954 | static void netdev_init_one_queue(struct net_device *dev, |
5955 | struct netdev_queue *queue, void *_unused) | |
5956 | { | |
5957 | /* Initialize queue lock */ | |
5958 | spin_lock_init(&queue->_xmit_lock); | |
5959 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); | |
5960 | queue->xmit_lock_owner = -1; | |
b236da69 | 5961 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 5962 | queue->dev = dev; |
114cf580 TH |
5963 | #ifdef CONFIG_BQL |
5964 | dql_init(&queue->dql, HZ); | |
5965 | #endif | |
aa942104 CG |
5966 | } |
5967 | ||
60877a32 ED |
5968 | static void netif_free_tx_queues(struct net_device *dev) |
5969 | { | |
4cb28970 | 5970 | kvfree(dev->_tx); |
60877a32 ED |
5971 | } |
5972 | ||
e6484930 TH |
5973 | static int netif_alloc_netdev_queues(struct net_device *dev) |
5974 | { | |
5975 | unsigned int count = dev->num_tx_queues; | |
5976 | struct netdev_queue *tx; | |
60877a32 | 5977 | size_t sz = count * sizeof(*tx); |
e6484930 | 5978 | |
60877a32 | 5979 | BUG_ON(count < 1 || count > 0xffff); |
62b5942a | 5980 | |
60877a32 ED |
5981 | tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
5982 | if (!tx) { | |
5983 | tx = vzalloc(sz); | |
5984 | if (!tx) | |
5985 | return -ENOMEM; | |
5986 | } | |
e6484930 | 5987 | dev->_tx = tx; |
1d24eb48 | 5988 | |
e6484930 TH |
5989 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
5990 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
5991 | |
5992 | return 0; | |
e6484930 TH |
5993 | } |
5994 | ||
1da177e4 LT |
5995 | /** |
5996 | * register_netdevice - register a network device | |
5997 | * @dev: device to register | |
5998 | * | |
5999 | * Take a completed network device structure and add it to the kernel | |
6000 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
6001 | * chain. 0 is returned on success. A negative errno code is returned | |
6002 | * on a failure to set up the device, or if the name is a duplicate. | |
6003 | * | |
6004 | * Callers must hold the rtnl semaphore. You may want | |
6005 | * register_netdev() instead of this. | |
6006 | * | |
6007 | * BUGS: | |
6008 | * The locking appears insufficient to guarantee two parallel registers | |
6009 | * will not get the same name. | |
6010 | */ | |
6011 | ||
6012 | int register_netdevice(struct net_device *dev) | |
6013 | { | |
1da177e4 | 6014 | int ret; |
d314774c | 6015 | struct net *net = dev_net(dev); |
1da177e4 LT |
6016 | |
6017 | BUG_ON(dev_boot_phase); | |
6018 | ASSERT_RTNL(); | |
6019 | ||
b17a7c17 SH |
6020 | might_sleep(); |
6021 | ||
1da177e4 LT |
6022 | /* When net_device's are persistent, this will be fatal. */ |
6023 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 6024 | BUG_ON(!net); |
1da177e4 | 6025 | |
f1f28aa3 | 6026 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 6027 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 6028 | |
1da177e4 LT |
6029 | dev->iflink = -1; |
6030 | ||
828de4f6 | 6031 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
6032 | if (ret < 0) |
6033 | goto out; | |
6034 | ||
1da177e4 | 6035 | /* Init, if this function is available */ |
d314774c SH |
6036 | if (dev->netdev_ops->ndo_init) { |
6037 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
6038 | if (ret) { |
6039 | if (ret > 0) | |
6040 | ret = -EIO; | |
90833aa4 | 6041 | goto out; |
1da177e4 LT |
6042 | } |
6043 | } | |
4ec93edb | 6044 | |
f646968f PM |
6045 | if (((dev->hw_features | dev->features) & |
6046 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
6047 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
6048 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
6049 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
6050 | ret = -EINVAL; | |
6051 | goto err_uninit; | |
6052 | } | |
6053 | ||
9c7dafbf PE |
6054 | ret = -EBUSY; |
6055 | if (!dev->ifindex) | |
6056 | dev->ifindex = dev_new_index(net); | |
6057 | else if (__dev_get_by_index(net, dev->ifindex)) | |
6058 | goto err_uninit; | |
6059 | ||
1da177e4 LT |
6060 | if (dev->iflink == -1) |
6061 | dev->iflink = dev->ifindex; | |
6062 | ||
5455c699 MM |
6063 | /* Transfer changeable features to wanted_features and enable |
6064 | * software offloads (GSO and GRO). | |
6065 | */ | |
6066 | dev->hw_features |= NETIF_F_SOFT_FEATURES; | |
14d1232f MM |
6067 | dev->features |= NETIF_F_SOFT_FEATURES; |
6068 | dev->wanted_features = dev->features & dev->hw_features; | |
1da177e4 | 6069 | |
34324dc2 MM |
6070 | if (!(dev->flags & IFF_LOOPBACK)) { |
6071 | dev->hw_features |= NETIF_F_NOCACHE_COPY; | |
c6e1a0d1 TH |
6072 | } |
6073 | ||
1180e7d6 | 6074 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 6075 | */ |
1180e7d6 | 6076 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 6077 | |
ee579677 PS |
6078 | /* Make NETIF_F_SG inheritable to tunnel devices. |
6079 | */ | |
6080 | dev->hw_enc_features |= NETIF_F_SG; | |
6081 | ||
0d89d203 SH |
6082 | /* Make NETIF_F_SG inheritable to MPLS. |
6083 | */ | |
6084 | dev->mpls_features |= NETIF_F_SG; | |
6085 | ||
7ffbe3fd JB |
6086 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
6087 | ret = notifier_to_errno(ret); | |
6088 | if (ret) | |
6089 | goto err_uninit; | |
6090 | ||
8b41d188 | 6091 | ret = netdev_register_kobject(dev); |
b17a7c17 | 6092 | if (ret) |
7ce1b0ed | 6093 | goto err_uninit; |
b17a7c17 SH |
6094 | dev->reg_state = NETREG_REGISTERED; |
6095 | ||
6cb6a27c | 6096 | __netdev_update_features(dev); |
8e9b59b2 | 6097 | |
1da177e4 LT |
6098 | /* |
6099 | * Default initial state at registry is that the | |
6100 | * device is present. | |
6101 | */ | |
6102 | ||
6103 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
6104 | ||
8f4cccbb BH |
6105 | linkwatch_init_dev(dev); |
6106 | ||
1da177e4 | 6107 | dev_init_scheduler(dev); |
1da177e4 | 6108 | dev_hold(dev); |
ce286d32 | 6109 | list_netdevice(dev); |
7bf23575 | 6110 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 6111 | |
948b337e JP |
6112 | /* If the device has permanent device address, driver should |
6113 | * set dev_addr and also addr_assign_type should be set to | |
6114 | * NET_ADDR_PERM (default value). | |
6115 | */ | |
6116 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
6117 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
6118 | ||
1da177e4 | 6119 | /* Notify protocols, that a new device appeared. */ |
056925ab | 6120 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 6121 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
6122 | if (ret) { |
6123 | rollback_registered(dev); | |
6124 | dev->reg_state = NETREG_UNREGISTERED; | |
6125 | } | |
d90a909e EB |
6126 | /* |
6127 | * Prevent userspace races by waiting until the network | |
6128 | * device is fully setup before sending notifications. | |
6129 | */ | |
a2835763 PM |
6130 | if (!dev->rtnl_link_ops || |
6131 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 6132 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
6133 | |
6134 | out: | |
6135 | return ret; | |
7ce1b0ed HX |
6136 | |
6137 | err_uninit: | |
d314774c SH |
6138 | if (dev->netdev_ops->ndo_uninit) |
6139 | dev->netdev_ops->ndo_uninit(dev); | |
7ce1b0ed | 6140 | goto out; |
1da177e4 | 6141 | } |
d1b19dff | 6142 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 6143 | |
937f1ba5 BH |
6144 | /** |
6145 | * init_dummy_netdev - init a dummy network device for NAPI | |
6146 | * @dev: device to init | |
6147 | * | |
6148 | * This takes a network device structure and initialize the minimum | |
6149 | * amount of fields so it can be used to schedule NAPI polls without | |
6150 | * registering a full blown interface. This is to be used by drivers | |
6151 | * that need to tie several hardware interfaces to a single NAPI | |
6152 | * poll scheduler due to HW limitations. | |
6153 | */ | |
6154 | int init_dummy_netdev(struct net_device *dev) | |
6155 | { | |
6156 | /* Clear everything. Note we don't initialize spinlocks | |
6157 | * are they aren't supposed to be taken by any of the | |
6158 | * NAPI code and this dummy netdev is supposed to be | |
6159 | * only ever used for NAPI polls | |
6160 | */ | |
6161 | memset(dev, 0, sizeof(struct net_device)); | |
6162 | ||
6163 | /* make sure we BUG if trying to hit standard | |
6164 | * register/unregister code path | |
6165 | */ | |
6166 | dev->reg_state = NETREG_DUMMY; | |
6167 | ||
937f1ba5 BH |
6168 | /* NAPI wants this */ |
6169 | INIT_LIST_HEAD(&dev->napi_list); | |
6170 | ||
6171 | /* a dummy interface is started by default */ | |
6172 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
6173 | set_bit(__LINK_STATE_START, &dev->state); | |
6174 | ||
29b4433d ED |
6175 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
6176 | * because users of this 'device' dont need to change | |
6177 | * its refcount. | |
6178 | */ | |
6179 | ||
937f1ba5 BH |
6180 | return 0; |
6181 | } | |
6182 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
6183 | ||
6184 | ||
1da177e4 LT |
6185 | /** |
6186 | * register_netdev - register a network device | |
6187 | * @dev: device to register | |
6188 | * | |
6189 | * Take a completed network device structure and add it to the kernel | |
6190 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
6191 | * chain. 0 is returned on success. A negative errno code is returned | |
6192 | * on a failure to set up the device, or if the name is a duplicate. | |
6193 | * | |
38b4da38 | 6194 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
6195 | * and expands the device name if you passed a format string to |
6196 | * alloc_netdev. | |
6197 | */ | |
6198 | int register_netdev(struct net_device *dev) | |
6199 | { | |
6200 | int err; | |
6201 | ||
6202 | rtnl_lock(); | |
1da177e4 | 6203 | err = register_netdevice(dev); |
1da177e4 LT |
6204 | rtnl_unlock(); |
6205 | return err; | |
6206 | } | |
6207 | EXPORT_SYMBOL(register_netdev); | |
6208 | ||
29b4433d ED |
6209 | int netdev_refcnt_read(const struct net_device *dev) |
6210 | { | |
6211 | int i, refcnt = 0; | |
6212 | ||
6213 | for_each_possible_cpu(i) | |
6214 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
6215 | return refcnt; | |
6216 | } | |
6217 | EXPORT_SYMBOL(netdev_refcnt_read); | |
6218 | ||
2c53040f | 6219 | /** |
1da177e4 | 6220 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 6221 | * @dev: target net_device |
1da177e4 LT |
6222 | * |
6223 | * This is called when unregistering network devices. | |
6224 | * | |
6225 | * Any protocol or device that holds a reference should register | |
6226 | * for netdevice notification, and cleanup and put back the | |
6227 | * reference if they receive an UNREGISTER event. | |
6228 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 6229 | * call dev_put. |
1da177e4 LT |
6230 | */ |
6231 | static void netdev_wait_allrefs(struct net_device *dev) | |
6232 | { | |
6233 | unsigned long rebroadcast_time, warning_time; | |
29b4433d | 6234 | int refcnt; |
1da177e4 | 6235 | |
e014debe ED |
6236 | linkwatch_forget_dev(dev); |
6237 | ||
1da177e4 | 6238 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
6239 | refcnt = netdev_refcnt_read(dev); |
6240 | ||
6241 | while (refcnt != 0) { | |
1da177e4 | 6242 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 6243 | rtnl_lock(); |
1da177e4 LT |
6244 | |
6245 | /* Rebroadcast unregister notification */ | |
056925ab | 6246 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 6247 | |
748e2d93 | 6248 | __rtnl_unlock(); |
0115e8e3 | 6249 | rcu_barrier(); |
748e2d93 ED |
6250 | rtnl_lock(); |
6251 | ||
0115e8e3 | 6252 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
1da177e4 LT |
6253 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
6254 | &dev->state)) { | |
6255 | /* We must not have linkwatch events | |
6256 | * pending on unregister. If this | |
6257 | * happens, we simply run the queue | |
6258 | * unscheduled, resulting in a noop | |
6259 | * for this device. | |
6260 | */ | |
6261 | linkwatch_run_queue(); | |
6262 | } | |
6263 | ||
6756ae4b | 6264 | __rtnl_unlock(); |
1da177e4 LT |
6265 | |
6266 | rebroadcast_time = jiffies; | |
6267 | } | |
6268 | ||
6269 | msleep(250); | |
6270 | ||
29b4433d ED |
6271 | refcnt = netdev_refcnt_read(dev); |
6272 | ||
1da177e4 | 6273 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
7b6cd1ce JP |
6274 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
6275 | dev->name, refcnt); | |
1da177e4 LT |
6276 | warning_time = jiffies; |
6277 | } | |
6278 | } | |
6279 | } | |
6280 | ||
6281 | /* The sequence is: | |
6282 | * | |
6283 | * rtnl_lock(); | |
6284 | * ... | |
6285 | * register_netdevice(x1); | |
6286 | * register_netdevice(x2); | |
6287 | * ... | |
6288 | * unregister_netdevice(y1); | |
6289 | * unregister_netdevice(y2); | |
6290 | * ... | |
6291 | * rtnl_unlock(); | |
6292 | * free_netdev(y1); | |
6293 | * free_netdev(y2); | |
6294 | * | |
58ec3b4d | 6295 | * We are invoked by rtnl_unlock(). |
1da177e4 | 6296 | * This allows us to deal with problems: |
b17a7c17 | 6297 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
6298 | * without deadlocking with linkwatch via keventd. |
6299 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
6300 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
6301 | * |
6302 | * We must not return until all unregister events added during | |
6303 | * the interval the lock was held have been completed. | |
1da177e4 | 6304 | */ |
1da177e4 LT |
6305 | void netdev_run_todo(void) |
6306 | { | |
626ab0e6 | 6307 | struct list_head list; |
1da177e4 | 6308 | |
1da177e4 | 6309 | /* Snapshot list, allow later requests */ |
626ab0e6 | 6310 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
6311 | |
6312 | __rtnl_unlock(); | |
626ab0e6 | 6313 | |
0115e8e3 ED |
6314 | |
6315 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
6316 | if (!list_empty(&list)) |
6317 | rcu_barrier(); | |
6318 | ||
1da177e4 LT |
6319 | while (!list_empty(&list)) { |
6320 | struct net_device *dev | |
e5e26d75 | 6321 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
6322 | list_del(&dev->todo_list); |
6323 | ||
748e2d93 | 6324 | rtnl_lock(); |
0115e8e3 | 6325 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
748e2d93 | 6326 | __rtnl_unlock(); |
0115e8e3 | 6327 | |
b17a7c17 | 6328 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 6329 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
6330 | dev->name, dev->reg_state); |
6331 | dump_stack(); | |
6332 | continue; | |
6333 | } | |
1da177e4 | 6334 | |
b17a7c17 | 6335 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 6336 | |
152102c7 | 6337 | on_each_cpu(flush_backlog, dev, 1); |
6e583ce5 | 6338 | |
b17a7c17 | 6339 | netdev_wait_allrefs(dev); |
1da177e4 | 6340 | |
b17a7c17 | 6341 | /* paranoia */ |
29b4433d | 6342 | BUG_ON(netdev_refcnt_read(dev)); |
33d480ce ED |
6343 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
6344 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
547b792c | 6345 | WARN_ON(dev->dn_ptr); |
1da177e4 | 6346 | |
b17a7c17 SH |
6347 | if (dev->destructor) |
6348 | dev->destructor(dev); | |
9093bbb2 | 6349 | |
50624c93 EB |
6350 | /* Report a network device has been unregistered */ |
6351 | rtnl_lock(); | |
6352 | dev_net(dev)->dev_unreg_count--; | |
6353 | __rtnl_unlock(); | |
6354 | wake_up(&netdev_unregistering_wq); | |
6355 | ||
9093bbb2 SH |
6356 | /* Free network device */ |
6357 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 6358 | } |
1da177e4 LT |
6359 | } |
6360 | ||
3cfde79c BH |
6361 | /* Convert net_device_stats to rtnl_link_stats64. They have the same |
6362 | * fields in the same order, with only the type differing. | |
6363 | */ | |
77a1abf5 ED |
6364 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
6365 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
6366 | { |
6367 | #if BITS_PER_LONG == 64 | |
77a1abf5 ED |
6368 | BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats)); |
6369 | memcpy(stats64, netdev_stats, sizeof(*stats64)); | |
3cfde79c BH |
6370 | #else |
6371 | size_t i, n = sizeof(*stats64) / sizeof(u64); | |
6372 | const unsigned long *src = (const unsigned long *)netdev_stats; | |
6373 | u64 *dst = (u64 *)stats64; | |
6374 | ||
6375 | BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) != | |
6376 | sizeof(*stats64) / sizeof(u64)); | |
6377 | for (i = 0; i < n; i++) | |
6378 | dst[i] = src[i]; | |
6379 | #endif | |
6380 | } | |
77a1abf5 | 6381 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 6382 | |
eeda3fd6 SH |
6383 | /** |
6384 | * dev_get_stats - get network device statistics | |
6385 | * @dev: device to get statistics from | |
28172739 | 6386 | * @storage: place to store stats |
eeda3fd6 | 6387 | * |
d7753516 BH |
6388 | * Get network statistics from device. Return @storage. |
6389 | * The device driver may provide its own method by setting | |
6390 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
6391 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 6392 | */ |
d7753516 BH |
6393 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
6394 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 6395 | { |
eeda3fd6 SH |
6396 | const struct net_device_ops *ops = dev->netdev_ops; |
6397 | ||
28172739 ED |
6398 | if (ops->ndo_get_stats64) { |
6399 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
6400 | ops->ndo_get_stats64(dev, storage); |
6401 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 6402 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
6403 | } else { |
6404 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 6405 | } |
caf586e5 | 6406 | storage->rx_dropped += atomic_long_read(&dev->rx_dropped); |
015f0688 | 6407 | storage->tx_dropped += atomic_long_read(&dev->tx_dropped); |
28172739 | 6408 | return storage; |
c45d286e | 6409 | } |
eeda3fd6 | 6410 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 6411 | |
24824a09 | 6412 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 6413 | { |
24824a09 | 6414 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 6415 | |
24824a09 ED |
6416 | #ifdef CONFIG_NET_CLS_ACT |
6417 | if (queue) | |
6418 | return queue; | |
6419 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
6420 | if (!queue) | |
6421 | return NULL; | |
6422 | netdev_init_one_queue(dev, queue, NULL); | |
24824a09 ED |
6423 | queue->qdisc = &noop_qdisc; |
6424 | queue->qdisc_sleeping = &noop_qdisc; | |
6425 | rcu_assign_pointer(dev->ingress_queue, queue); | |
6426 | #endif | |
6427 | return queue; | |
bb949fbd DM |
6428 | } |
6429 | ||
2c60db03 ED |
6430 | static const struct ethtool_ops default_ethtool_ops; |
6431 | ||
d07d7507 SG |
6432 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
6433 | const struct ethtool_ops *ops) | |
6434 | { | |
6435 | if (dev->ethtool_ops == &default_ethtool_ops) | |
6436 | dev->ethtool_ops = ops; | |
6437 | } | |
6438 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
6439 | ||
74d332c1 ED |
6440 | void netdev_freemem(struct net_device *dev) |
6441 | { | |
6442 | char *addr = (char *)dev - dev->padded; | |
6443 | ||
4cb28970 | 6444 | kvfree(addr); |
74d332c1 ED |
6445 | } |
6446 | ||
1da177e4 | 6447 | /** |
36909ea4 | 6448 | * alloc_netdev_mqs - allocate network device |
1da177e4 LT |
6449 | * @sizeof_priv: size of private data to allocate space for |
6450 | * @name: device name format string | |
6451 | * @setup: callback to initialize device | |
36909ea4 TH |
6452 | * @txqs: the number of TX subqueues to allocate |
6453 | * @rxqs: the number of RX subqueues to allocate | |
1da177e4 LT |
6454 | * |
6455 | * Allocates a struct net_device with private data area for driver use | |
90e51adf | 6456 | * and performs basic initialization. Also allocates subqueue structs |
36909ea4 | 6457 | * for each queue on the device. |
1da177e4 | 6458 | */ |
36909ea4 TH |
6459 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
6460 | void (*setup)(struct net_device *), | |
6461 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 6462 | { |
1da177e4 | 6463 | struct net_device *dev; |
7943986c | 6464 | size_t alloc_size; |
1ce8e7b5 | 6465 | struct net_device *p; |
1da177e4 | 6466 | |
b6fe17d6 SH |
6467 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
6468 | ||
36909ea4 | 6469 | if (txqs < 1) { |
7b6cd1ce | 6470 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
6471 | return NULL; |
6472 | } | |
6473 | ||
a953be53 | 6474 | #ifdef CONFIG_SYSFS |
36909ea4 | 6475 | if (rxqs < 1) { |
7b6cd1ce | 6476 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
6477 | return NULL; |
6478 | } | |
6479 | #endif | |
6480 | ||
fd2ea0a7 | 6481 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
6482 | if (sizeof_priv) { |
6483 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 6484 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
6485 | alloc_size += sizeof_priv; |
6486 | } | |
6487 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 6488 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 6489 | |
74d332c1 ED |
6490 | p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
6491 | if (!p) | |
6492 | p = vzalloc(alloc_size); | |
62b5942a | 6493 | if (!p) |
1da177e4 | 6494 | return NULL; |
1da177e4 | 6495 | |
1ce8e7b5 | 6496 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 6497 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 6498 | |
29b4433d ED |
6499 | dev->pcpu_refcnt = alloc_percpu(int); |
6500 | if (!dev->pcpu_refcnt) | |
74d332c1 | 6501 | goto free_dev; |
ab9c73cc | 6502 | |
ab9c73cc | 6503 | if (dev_addr_init(dev)) |
29b4433d | 6504 | goto free_pcpu; |
ab9c73cc | 6505 | |
22bedad3 | 6506 | dev_mc_init(dev); |
a748ee24 | 6507 | dev_uc_init(dev); |
ccffad25 | 6508 | |
c346dca1 | 6509 | dev_net_set(dev, &init_net); |
1da177e4 | 6510 | |
8d3bdbd5 | 6511 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 6512 | dev->gso_max_segs = GSO_MAX_SEGS; |
8d3bdbd5 | 6513 | |
8d3bdbd5 DM |
6514 | INIT_LIST_HEAD(&dev->napi_list); |
6515 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 6516 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 6517 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
6518 | INIT_LIST_HEAD(&dev->adj_list.upper); |
6519 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
6520 | INIT_LIST_HEAD(&dev->all_adj_list.upper); | |
6521 | INIT_LIST_HEAD(&dev->all_adj_list.lower); | |
8d3bdbd5 DM |
6522 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
6523 | setup(dev); | |
6524 | ||
36909ea4 TH |
6525 | dev->num_tx_queues = txqs; |
6526 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 6527 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 6528 | goto free_all; |
e8a0464c | 6529 | |
a953be53 | 6530 | #ifdef CONFIG_SYSFS |
36909ea4 TH |
6531 | dev->num_rx_queues = rxqs; |
6532 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 6533 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 6534 | goto free_all; |
df334545 | 6535 | #endif |
0a9627f2 | 6536 | |
1da177e4 | 6537 | strcpy(dev->name, name); |
cbda10fa | 6538 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
6539 | if (!dev->ethtool_ops) |
6540 | dev->ethtool_ops = &default_ethtool_ops; | |
1da177e4 | 6541 | return dev; |
ab9c73cc | 6542 | |
8d3bdbd5 DM |
6543 | free_all: |
6544 | free_netdev(dev); | |
6545 | return NULL; | |
6546 | ||
29b4433d ED |
6547 | free_pcpu: |
6548 | free_percpu(dev->pcpu_refcnt); | |
74d332c1 ED |
6549 | free_dev: |
6550 | netdev_freemem(dev); | |
ab9c73cc | 6551 | return NULL; |
1da177e4 | 6552 | } |
36909ea4 | 6553 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
6554 | |
6555 | /** | |
6556 | * free_netdev - free network device | |
6557 | * @dev: device | |
6558 | * | |
4ec93edb YH |
6559 | * This function does the last stage of destroying an allocated device |
6560 | * interface. The reference to the device object is released. | |
1da177e4 LT |
6561 | * If this is the last reference then it will be freed. |
6562 | */ | |
6563 | void free_netdev(struct net_device *dev) | |
6564 | { | |
d565b0a1 HX |
6565 | struct napi_struct *p, *n; |
6566 | ||
f3005d7f DL |
6567 | release_net(dev_net(dev)); |
6568 | ||
60877a32 | 6569 | netif_free_tx_queues(dev); |
a953be53 | 6570 | #ifdef CONFIG_SYSFS |
fe822240 TH |
6571 | kfree(dev->_rx); |
6572 | #endif | |
e8a0464c | 6573 | |
33d480ce | 6574 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 6575 | |
f001fde5 JP |
6576 | /* Flush device addresses */ |
6577 | dev_addr_flush(dev); | |
6578 | ||
d565b0a1 HX |
6579 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
6580 | netif_napi_del(p); | |
6581 | ||
29b4433d ED |
6582 | free_percpu(dev->pcpu_refcnt); |
6583 | dev->pcpu_refcnt = NULL; | |
6584 | ||
3041a069 | 6585 | /* Compatibility with error handling in drivers */ |
1da177e4 | 6586 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 6587 | netdev_freemem(dev); |
1da177e4 LT |
6588 | return; |
6589 | } | |
6590 | ||
6591 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
6592 | dev->reg_state = NETREG_RELEASED; | |
6593 | ||
43cb76d9 GKH |
6594 | /* will free via device release */ |
6595 | put_device(&dev->dev); | |
1da177e4 | 6596 | } |
d1b19dff | 6597 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 6598 | |
f0db275a SH |
6599 | /** |
6600 | * synchronize_net - Synchronize with packet receive processing | |
6601 | * | |
6602 | * Wait for packets currently being received to be done. | |
6603 | * Does not block later packets from starting. | |
6604 | */ | |
4ec93edb | 6605 | void synchronize_net(void) |
1da177e4 LT |
6606 | { |
6607 | might_sleep(); | |
be3fc413 ED |
6608 | if (rtnl_is_locked()) |
6609 | synchronize_rcu_expedited(); | |
6610 | else | |
6611 | synchronize_rcu(); | |
1da177e4 | 6612 | } |
d1b19dff | 6613 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
6614 | |
6615 | /** | |
44a0873d | 6616 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 6617 | * @dev: device |
44a0873d | 6618 | * @head: list |
6ebfbc06 | 6619 | * |
1da177e4 | 6620 | * This function shuts down a device interface and removes it |
d59b54b1 | 6621 | * from the kernel tables. |
44a0873d | 6622 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
6623 | * |
6624 | * Callers must hold the rtnl semaphore. You may want | |
6625 | * unregister_netdev() instead of this. | |
6626 | */ | |
6627 | ||
44a0873d | 6628 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 6629 | { |
a6620712 HX |
6630 | ASSERT_RTNL(); |
6631 | ||
44a0873d | 6632 | if (head) { |
9fdce099 | 6633 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
6634 | } else { |
6635 | rollback_registered(dev); | |
6636 | /* Finish processing unregister after unlock */ | |
6637 | net_set_todo(dev); | |
6638 | } | |
1da177e4 | 6639 | } |
44a0873d | 6640 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 6641 | |
9b5e383c ED |
6642 | /** |
6643 | * unregister_netdevice_many - unregister many devices | |
6644 | * @head: list of devices | |
87757a91 ED |
6645 | * |
6646 | * Note: As most callers use a stack allocated list_head, | |
6647 | * we force a list_del() to make sure stack wont be corrupted later. | |
9b5e383c ED |
6648 | */ |
6649 | void unregister_netdevice_many(struct list_head *head) | |
6650 | { | |
6651 | struct net_device *dev; | |
6652 | ||
6653 | if (!list_empty(head)) { | |
6654 | rollback_registered_many(head); | |
6655 | list_for_each_entry(dev, head, unreg_list) | |
6656 | net_set_todo(dev); | |
87757a91 | 6657 | list_del(head); |
9b5e383c ED |
6658 | } |
6659 | } | |
63c8099d | 6660 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 6661 | |
1da177e4 LT |
6662 | /** |
6663 | * unregister_netdev - remove device from the kernel | |
6664 | * @dev: device | |
6665 | * | |
6666 | * This function shuts down a device interface and removes it | |
d59b54b1 | 6667 | * from the kernel tables. |
1da177e4 LT |
6668 | * |
6669 | * This is just a wrapper for unregister_netdevice that takes | |
6670 | * the rtnl semaphore. In general you want to use this and not | |
6671 | * unregister_netdevice. | |
6672 | */ | |
6673 | void unregister_netdev(struct net_device *dev) | |
6674 | { | |
6675 | rtnl_lock(); | |
6676 | unregister_netdevice(dev); | |
6677 | rtnl_unlock(); | |
6678 | } | |
1da177e4 LT |
6679 | EXPORT_SYMBOL(unregister_netdev); |
6680 | ||
ce286d32 EB |
6681 | /** |
6682 | * dev_change_net_namespace - move device to different nethost namespace | |
6683 | * @dev: device | |
6684 | * @net: network namespace | |
6685 | * @pat: If not NULL name pattern to try if the current device name | |
6686 | * is already taken in the destination network namespace. | |
6687 | * | |
6688 | * This function shuts down a device interface and moves it | |
6689 | * to a new network namespace. On success 0 is returned, on | |
6690 | * a failure a netagive errno code is returned. | |
6691 | * | |
6692 | * Callers must hold the rtnl semaphore. | |
6693 | */ | |
6694 | ||
6695 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
6696 | { | |
ce286d32 EB |
6697 | int err; |
6698 | ||
6699 | ASSERT_RTNL(); | |
6700 | ||
6701 | /* Don't allow namespace local devices to be moved. */ | |
6702 | err = -EINVAL; | |
6703 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
6704 | goto out; | |
6705 | ||
6706 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
6707 | if (dev->reg_state != NETREG_REGISTERED) |
6708 | goto out; | |
6709 | ||
6710 | /* Get out if there is nothing todo */ | |
6711 | err = 0; | |
878628fb | 6712 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
6713 | goto out; |
6714 | ||
6715 | /* Pick the destination device name, and ensure | |
6716 | * we can use it in the destination network namespace. | |
6717 | */ | |
6718 | err = -EEXIST; | |
d9031024 | 6719 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
6720 | /* We get here if we can't use the current device name */ |
6721 | if (!pat) | |
6722 | goto out; | |
828de4f6 | 6723 | if (dev_get_valid_name(net, dev, pat) < 0) |
ce286d32 EB |
6724 | goto out; |
6725 | } | |
6726 | ||
6727 | /* | |
6728 | * And now a mini version of register_netdevice unregister_netdevice. | |
6729 | */ | |
6730 | ||
6731 | /* If device is running close it first. */ | |
9b772652 | 6732 | dev_close(dev); |
ce286d32 EB |
6733 | |
6734 | /* And unlink it from device chain */ | |
6735 | err = -ENODEV; | |
6736 | unlist_netdevice(dev); | |
6737 | ||
6738 | synchronize_net(); | |
6739 | ||
6740 | /* Shutdown queueing discipline. */ | |
6741 | dev_shutdown(dev); | |
6742 | ||
6743 | /* Notify protocols, that we are about to destroy | |
6744 | this device. They should clean all the things. | |
3b27e105 DL |
6745 | |
6746 | Note that dev->reg_state stays at NETREG_REGISTERED. | |
6747 | This is wanted because this way 8021q and macvlan know | |
6748 | the device is just moving and can keep their slaves up. | |
ce286d32 EB |
6749 | */ |
6750 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
6549dd43 G |
6751 | rcu_barrier(); |
6752 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); | |
7f294054 | 6753 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); |
ce286d32 EB |
6754 | |
6755 | /* | |
6756 | * Flush the unicast and multicast chains | |
6757 | */ | |
a748ee24 | 6758 | dev_uc_flush(dev); |
22bedad3 | 6759 | dev_mc_flush(dev); |
ce286d32 | 6760 | |
4e66ae2e SH |
6761 | /* Send a netdev-removed uevent to the old namespace */ |
6762 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
6763 | ||
ce286d32 | 6764 | /* Actually switch the network namespace */ |
c346dca1 | 6765 | dev_net_set(dev, net); |
ce286d32 | 6766 | |
ce286d32 EB |
6767 | /* If there is an ifindex conflict assign a new one */ |
6768 | if (__dev_get_by_index(net, dev->ifindex)) { | |
6769 | int iflink = (dev->iflink == dev->ifindex); | |
6770 | dev->ifindex = dev_new_index(net); | |
6771 | if (iflink) | |
6772 | dev->iflink = dev->ifindex; | |
6773 | } | |
6774 | ||
4e66ae2e SH |
6775 | /* Send a netdev-add uevent to the new namespace */ |
6776 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
6777 | ||
8b41d188 | 6778 | /* Fixup kobjects */ |
a1b3f594 | 6779 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 6780 | WARN_ON(err); |
ce286d32 EB |
6781 | |
6782 | /* Add the device back in the hashes */ | |
6783 | list_netdevice(dev); | |
6784 | ||
6785 | /* Notify protocols, that a new device appeared. */ | |
6786 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
6787 | ||
d90a909e EB |
6788 | /* |
6789 | * Prevent userspace races by waiting until the network | |
6790 | * device is fully setup before sending notifications. | |
6791 | */ | |
7f294054 | 6792 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 6793 | |
ce286d32 EB |
6794 | synchronize_net(); |
6795 | err = 0; | |
6796 | out: | |
6797 | return err; | |
6798 | } | |
463d0183 | 6799 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 6800 | |
1da177e4 LT |
6801 | static int dev_cpu_callback(struct notifier_block *nfb, |
6802 | unsigned long action, | |
6803 | void *ocpu) | |
6804 | { | |
6805 | struct sk_buff **list_skb; | |
1da177e4 LT |
6806 | struct sk_buff *skb; |
6807 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
6808 | struct softnet_data *sd, *oldsd; | |
6809 | ||
8bb78442 | 6810 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
6811 | return NOTIFY_OK; |
6812 | ||
6813 | local_irq_disable(); | |
6814 | cpu = smp_processor_id(); | |
6815 | sd = &per_cpu(softnet_data, cpu); | |
6816 | oldsd = &per_cpu(softnet_data, oldcpu); | |
6817 | ||
6818 | /* Find end of our completion_queue. */ | |
6819 | list_skb = &sd->completion_queue; | |
6820 | while (*list_skb) | |
6821 | list_skb = &(*list_skb)->next; | |
6822 | /* Append completion queue from offline CPU. */ | |
6823 | *list_skb = oldsd->completion_queue; | |
6824 | oldsd->completion_queue = NULL; | |
6825 | ||
1da177e4 | 6826 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
6827 | if (oldsd->output_queue) { |
6828 | *sd->output_queue_tailp = oldsd->output_queue; | |
6829 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
6830 | oldsd->output_queue = NULL; | |
6831 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
6832 | } | |
264524d5 HC |
6833 | /* Append NAPI poll list from offline CPU. */ |
6834 | if (!list_empty(&oldsd->poll_list)) { | |
6835 | list_splice_init(&oldsd->poll_list, &sd->poll_list); | |
6836 | raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
6837 | } | |
1da177e4 LT |
6838 | |
6839 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
6840 | local_irq_enable(); | |
6841 | ||
6842 | /* Process offline CPU's input_pkt_queue */ | |
76cc8b13 | 6843 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
ae78dbfa | 6844 | netif_rx_internal(skb); |
76cc8b13 | 6845 | input_queue_head_incr(oldsd); |
fec5e652 | 6846 | } |
76cc8b13 | 6847 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { |
ae78dbfa | 6848 | netif_rx_internal(skb); |
76cc8b13 TH |
6849 | input_queue_head_incr(oldsd); |
6850 | } | |
1da177e4 LT |
6851 | |
6852 | return NOTIFY_OK; | |
6853 | } | |
1da177e4 LT |
6854 | |
6855 | ||
7f353bf2 | 6856 | /** |
b63365a2 HX |
6857 | * netdev_increment_features - increment feature set by one |
6858 | * @all: current feature set | |
6859 | * @one: new feature set | |
6860 | * @mask: mask feature set | |
7f353bf2 HX |
6861 | * |
6862 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
6863 | * @one to the master device with current feature set @all. Will not |
6864 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 6865 | */ |
c8f44aff MM |
6866 | netdev_features_t netdev_increment_features(netdev_features_t all, |
6867 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 6868 | { |
1742f183 MM |
6869 | if (mask & NETIF_F_GEN_CSUM) |
6870 | mask |= NETIF_F_ALL_CSUM; | |
6871 | mask |= NETIF_F_VLAN_CHALLENGED; | |
7f353bf2 | 6872 | |
1742f183 MM |
6873 | all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask; |
6874 | all &= one | ~NETIF_F_ALL_FOR_ALL; | |
c6e1a0d1 | 6875 | |
1742f183 MM |
6876 | /* If one device supports hw checksumming, set for all. */ |
6877 | if (all & NETIF_F_GEN_CSUM) | |
6878 | all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM); | |
7f353bf2 HX |
6879 | |
6880 | return all; | |
6881 | } | |
b63365a2 | 6882 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 6883 | |
430f03cd | 6884 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
6885 | { |
6886 | int i; | |
6887 | struct hlist_head *hash; | |
6888 | ||
6889 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); | |
6890 | if (hash != NULL) | |
6891 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
6892 | INIT_HLIST_HEAD(&hash[i]); | |
6893 | ||
6894 | return hash; | |
6895 | } | |
6896 | ||
881d966b | 6897 | /* Initialize per network namespace state */ |
4665079c | 6898 | static int __net_init netdev_init(struct net *net) |
881d966b | 6899 | { |
734b6541 RM |
6900 | if (net != &init_net) |
6901 | INIT_LIST_HEAD(&net->dev_base_head); | |
881d966b | 6902 | |
30d97d35 PE |
6903 | net->dev_name_head = netdev_create_hash(); |
6904 | if (net->dev_name_head == NULL) | |
6905 | goto err_name; | |
881d966b | 6906 | |
30d97d35 PE |
6907 | net->dev_index_head = netdev_create_hash(); |
6908 | if (net->dev_index_head == NULL) | |
6909 | goto err_idx; | |
881d966b EB |
6910 | |
6911 | return 0; | |
30d97d35 PE |
6912 | |
6913 | err_idx: | |
6914 | kfree(net->dev_name_head); | |
6915 | err_name: | |
6916 | return -ENOMEM; | |
881d966b EB |
6917 | } |
6918 | ||
f0db275a SH |
6919 | /** |
6920 | * netdev_drivername - network driver for the device | |
6921 | * @dev: network device | |
f0db275a SH |
6922 | * |
6923 | * Determine network driver for device. | |
6924 | */ | |
3019de12 | 6925 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 6926 | { |
cf04a4c7 SH |
6927 | const struct device_driver *driver; |
6928 | const struct device *parent; | |
3019de12 | 6929 | const char *empty = ""; |
6579e57b AV |
6930 | |
6931 | parent = dev->dev.parent; | |
6579e57b | 6932 | if (!parent) |
3019de12 | 6933 | return empty; |
6579e57b AV |
6934 | |
6935 | driver = parent->driver; | |
6936 | if (driver && driver->name) | |
3019de12 DM |
6937 | return driver->name; |
6938 | return empty; | |
6579e57b AV |
6939 | } |
6940 | ||
b004ff49 | 6941 | static int __netdev_printk(const char *level, const struct net_device *dev, |
256df2f3 JP |
6942 | struct va_format *vaf) |
6943 | { | |
6944 | int r; | |
6945 | ||
b004ff49 | 6946 | if (dev && dev->dev.parent) { |
666f355f JP |
6947 | r = dev_printk_emit(level[1] - '0', |
6948 | dev->dev.parent, | |
6949 | "%s %s %s: %pV", | |
6950 | dev_driver_string(dev->dev.parent), | |
6951 | dev_name(dev->dev.parent), | |
6952 | netdev_name(dev), vaf); | |
b004ff49 | 6953 | } else if (dev) { |
256df2f3 | 6954 | r = printk("%s%s: %pV", level, netdev_name(dev), vaf); |
b004ff49 | 6955 | } else { |
256df2f3 | 6956 | r = printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 6957 | } |
256df2f3 JP |
6958 | |
6959 | return r; | |
6960 | } | |
6961 | ||
6962 | int netdev_printk(const char *level, const struct net_device *dev, | |
6963 | const char *format, ...) | |
6964 | { | |
6965 | struct va_format vaf; | |
6966 | va_list args; | |
6967 | int r; | |
6968 | ||
6969 | va_start(args, format); | |
6970 | ||
6971 | vaf.fmt = format; | |
6972 | vaf.va = &args; | |
6973 | ||
6974 | r = __netdev_printk(level, dev, &vaf); | |
b004ff49 | 6975 | |
256df2f3 JP |
6976 | va_end(args); |
6977 | ||
6978 | return r; | |
6979 | } | |
6980 | EXPORT_SYMBOL(netdev_printk); | |
6981 | ||
6982 | #define define_netdev_printk_level(func, level) \ | |
6983 | int func(const struct net_device *dev, const char *fmt, ...) \ | |
6984 | { \ | |
6985 | int r; \ | |
6986 | struct va_format vaf; \ | |
6987 | va_list args; \ | |
6988 | \ | |
6989 | va_start(args, fmt); \ | |
6990 | \ | |
6991 | vaf.fmt = fmt; \ | |
6992 | vaf.va = &args; \ | |
6993 | \ | |
6994 | r = __netdev_printk(level, dev, &vaf); \ | |
b004ff49 | 6995 | \ |
256df2f3 JP |
6996 | va_end(args); \ |
6997 | \ | |
6998 | return r; \ | |
6999 | } \ | |
7000 | EXPORT_SYMBOL(func); | |
7001 | ||
7002 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
7003 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
7004 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
7005 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
7006 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
7007 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
7008 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
7009 | ||
4665079c | 7010 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
7011 | { |
7012 | kfree(net->dev_name_head); | |
7013 | kfree(net->dev_index_head); | |
7014 | } | |
7015 | ||
022cbae6 | 7016 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
7017 | .init = netdev_init, |
7018 | .exit = netdev_exit, | |
7019 | }; | |
7020 | ||
4665079c | 7021 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 7022 | { |
e008b5fc | 7023 | struct net_device *dev, *aux; |
ce286d32 | 7024 | /* |
e008b5fc | 7025 | * Push all migratable network devices back to the |
ce286d32 EB |
7026 | * initial network namespace |
7027 | */ | |
7028 | rtnl_lock(); | |
e008b5fc | 7029 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 7030 | int err; |
aca51397 | 7031 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
7032 | |
7033 | /* Ignore unmoveable devices (i.e. loopback) */ | |
7034 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
7035 | continue; | |
7036 | ||
e008b5fc EB |
7037 | /* Leave virtual devices for the generic cleanup */ |
7038 | if (dev->rtnl_link_ops) | |
7039 | continue; | |
d0c082ce | 7040 | |
25985edc | 7041 | /* Push remaining network devices to init_net */ |
aca51397 PE |
7042 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
7043 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 7044 | if (err) { |
7b6cd1ce JP |
7045 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
7046 | __func__, dev->name, err); | |
aca51397 | 7047 | BUG(); |
ce286d32 EB |
7048 | } |
7049 | } | |
7050 | rtnl_unlock(); | |
7051 | } | |
7052 | ||
50624c93 EB |
7053 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
7054 | { | |
7055 | /* Return with the rtnl_lock held when there are no network | |
7056 | * devices unregistering in any network namespace in net_list. | |
7057 | */ | |
7058 | struct net *net; | |
7059 | bool unregistering; | |
7060 | DEFINE_WAIT(wait); | |
7061 | ||
7062 | for (;;) { | |
7063 | prepare_to_wait(&netdev_unregistering_wq, &wait, | |
7064 | TASK_UNINTERRUPTIBLE); | |
7065 | unregistering = false; | |
7066 | rtnl_lock(); | |
7067 | list_for_each_entry(net, net_list, exit_list) { | |
7068 | if (net->dev_unreg_count > 0) { | |
7069 | unregistering = true; | |
7070 | break; | |
7071 | } | |
7072 | } | |
7073 | if (!unregistering) | |
7074 | break; | |
7075 | __rtnl_unlock(); | |
7076 | schedule(); | |
7077 | } | |
7078 | finish_wait(&netdev_unregistering_wq, &wait); | |
7079 | } | |
7080 | ||
04dc7f6b EB |
7081 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
7082 | { | |
7083 | /* At exit all network devices most be removed from a network | |
b595076a | 7084 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
7085 | * Do this across as many network namespaces as possible to |
7086 | * improve batching efficiency. | |
7087 | */ | |
7088 | struct net_device *dev; | |
7089 | struct net *net; | |
7090 | LIST_HEAD(dev_kill_list); | |
7091 | ||
50624c93 EB |
7092 | /* To prevent network device cleanup code from dereferencing |
7093 | * loopback devices or network devices that have been freed | |
7094 | * wait here for all pending unregistrations to complete, | |
7095 | * before unregistring the loopback device and allowing the | |
7096 | * network namespace be freed. | |
7097 | * | |
7098 | * The netdev todo list containing all network devices | |
7099 | * unregistrations that happen in default_device_exit_batch | |
7100 | * will run in the rtnl_unlock() at the end of | |
7101 | * default_device_exit_batch. | |
7102 | */ | |
7103 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
7104 | list_for_each_entry(net, net_list, exit_list) { |
7105 | for_each_netdev_reverse(net, dev) { | |
7106 | if (dev->rtnl_link_ops) | |
7107 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); | |
7108 | else | |
7109 | unregister_netdevice_queue(dev, &dev_kill_list); | |
7110 | } | |
7111 | } | |
7112 | unregister_netdevice_many(&dev_kill_list); | |
7113 | rtnl_unlock(); | |
7114 | } | |
7115 | ||
022cbae6 | 7116 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 7117 | .exit = default_device_exit, |
04dc7f6b | 7118 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
7119 | }; |
7120 | ||
1da177e4 LT |
7121 | /* |
7122 | * Initialize the DEV module. At boot time this walks the device list and | |
7123 | * unhooks any devices that fail to initialise (normally hardware not | |
7124 | * present) and leaves us with a valid list of present and active devices. | |
7125 | * | |
7126 | */ | |
7127 | ||
7128 | /* | |
7129 | * This is called single threaded during boot, so no need | |
7130 | * to take the rtnl semaphore. | |
7131 | */ | |
7132 | static int __init net_dev_init(void) | |
7133 | { | |
7134 | int i, rc = -ENOMEM; | |
7135 | ||
7136 | BUG_ON(!dev_boot_phase); | |
7137 | ||
1da177e4 LT |
7138 | if (dev_proc_init()) |
7139 | goto out; | |
7140 | ||
8b41d188 | 7141 | if (netdev_kobject_init()) |
1da177e4 LT |
7142 | goto out; |
7143 | ||
7144 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 7145 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
7146 | INIT_LIST_HEAD(&ptype_base[i]); |
7147 | ||
62532da9 VY |
7148 | INIT_LIST_HEAD(&offload_base); |
7149 | ||
881d966b EB |
7150 | if (register_pernet_subsys(&netdev_net_ops)) |
7151 | goto out; | |
1da177e4 LT |
7152 | |
7153 | /* | |
7154 | * Initialise the packet receive queues. | |
7155 | */ | |
7156 | ||
6f912042 | 7157 | for_each_possible_cpu(i) { |
e36fa2f7 | 7158 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 7159 | |
e36fa2f7 | 7160 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 7161 | skb_queue_head_init(&sd->process_queue); |
e36fa2f7 | 7162 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 7163 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 7164 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
7165 | sd->csd.func = rps_trigger_softirq; |
7166 | sd->csd.info = sd; | |
e36fa2f7 | 7167 | sd->cpu = i; |
1e94d72f | 7168 | #endif |
0a9627f2 | 7169 | |
e36fa2f7 ED |
7170 | sd->backlog.poll = process_backlog; |
7171 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
7172 | } |
7173 | ||
1da177e4 LT |
7174 | dev_boot_phase = 0; |
7175 | ||
505d4f73 EB |
7176 | /* The loopback device is special if any other network devices |
7177 | * is present in a network namespace the loopback device must | |
7178 | * be present. Since we now dynamically allocate and free the | |
7179 | * loopback device ensure this invariant is maintained by | |
7180 | * keeping the loopback device as the first device on the | |
7181 | * list of network devices. Ensuring the loopback devices | |
7182 | * is the first device that appears and the last network device | |
7183 | * that disappears. | |
7184 | */ | |
7185 | if (register_pernet_device(&loopback_net_ops)) | |
7186 | goto out; | |
7187 | ||
7188 | if (register_pernet_device(&default_device_ops)) | |
7189 | goto out; | |
7190 | ||
962cf36c CM |
7191 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
7192 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 LT |
7193 | |
7194 | hotcpu_notifier(dev_cpu_callback, 0); | |
7195 | dst_init(); | |
1da177e4 LT |
7196 | rc = 0; |
7197 | out: | |
7198 | return rc; | |
7199 | } | |
7200 | ||
7201 | subsys_initcall(net_dev_init); |