2 * NET3 Protocol independent device support routines.
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.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
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>
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
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
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
51 * Rudi Cilibrasi : Pass the right thing to
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
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
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
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.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>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/stat.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <net/xfrm.h>
105 #include <linux/highmem.h>
106 #include <linux/init.h>
107 #include <linux/module.h>
108 #include <linux/netpoll.h>
109 #include <linux/rcupdate.h>
110 #include <linux/delay.h>
111 #include <net/iw_handler.h>
112 #include <asm/current.h>
113 #include <linux/audit.h>
114 #include <linux/dmaengine.h>
115 #include <linux/err.h>
116 #include <linux/ctype.h>
117 #include <linux/if_arp.h>
118 #include <linux/if_vlan.h>
119 #include <linux/ip.h>
121 #include <linux/ipv6.h>
122 #include <linux/in.h>
123 #include <linux/jhash.h>
124 #include <linux/random.h>
125 #include <trace/events/napi.h>
126 #include <trace/events/net.h>
127 #include <trace/events/skb.h>
128 #include <linux/pci.h>
129 #include <linux/inetdevice.h>
130 #include <linux/cpu_rmap.h>
131 #include <linux/static_key.h>
132 #include <linux/hashtable.h>
133 #include <linux/vmalloc.h>
134 #include <linux/if_macvlan.h>
136 #include "net-sysfs.h"
138 /* Instead of increasing this, you should create a hash table. */
139 #define MAX_GRO_SKBS 8
141 /* This should be increased if a protocol with a bigger head is added. */
142 #define GRO_MAX_HEAD (MAX_HEADER + 128)
144 static DEFINE_SPINLOCK(ptype_lock
);
145 static DEFINE_SPINLOCK(offload_lock
);
146 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
147 struct list_head ptype_all __read_mostly
; /* Taps */
148 static struct list_head offload_base __read_mostly
;
151 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
154 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
156 * Writers must hold the rtnl semaphore while they loop through the
157 * dev_base_head list, and hold dev_base_lock for writing when they do the
158 * actual updates. This allows pure readers to access the list even
159 * while a writer is preparing to update it.
161 * To put it another way, dev_base_lock is held for writing only to
162 * protect against pure readers; the rtnl semaphore provides the
163 * protection against other writers.
165 * See, for example usages, register_netdevice() and
166 * unregister_netdevice(), which must be called with the rtnl
169 DEFINE_RWLOCK(dev_base_lock
);
170 EXPORT_SYMBOL(dev_base_lock
);
172 /* protects napi_hash addition/deletion and napi_gen_id */
173 static DEFINE_SPINLOCK(napi_hash_lock
);
175 static unsigned int napi_gen_id
;
176 static DEFINE_HASHTABLE(napi_hash
, 8);
178 static seqcount_t devnet_rename_seq
;
180 static inline void dev_base_seq_inc(struct net
*net
)
182 while (++net
->dev_base_seq
== 0);
185 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
187 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
189 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
192 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
194 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
197 static inline void rps_lock(struct softnet_data
*sd
)
200 spin_lock(&sd
->input_pkt_queue
.lock
);
204 static inline void rps_unlock(struct softnet_data
*sd
)
207 spin_unlock(&sd
->input_pkt_queue
.lock
);
211 /* Device list insertion */
212 static void list_netdevice(struct net_device
*dev
)
214 struct net
*net
= dev_net(dev
);
218 write_lock_bh(&dev_base_lock
);
219 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
220 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
221 hlist_add_head_rcu(&dev
->index_hlist
,
222 dev_index_hash(net
, dev
->ifindex
));
223 write_unlock_bh(&dev_base_lock
);
225 dev_base_seq_inc(net
);
228 /* Device list removal
229 * caller must respect a RCU grace period before freeing/reusing dev
231 static void unlist_netdevice(struct net_device
*dev
)
235 /* Unlink dev from the device chain */
236 write_lock_bh(&dev_base_lock
);
237 list_del_rcu(&dev
->dev_list
);
238 hlist_del_rcu(&dev
->name_hlist
);
239 hlist_del_rcu(&dev
->index_hlist
);
240 write_unlock_bh(&dev_base_lock
);
242 dev_base_seq_inc(dev_net(dev
));
249 static RAW_NOTIFIER_HEAD(netdev_chain
);
252 * Device drivers call our routines to queue packets here. We empty the
253 * queue in the local softnet handler.
256 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
257 EXPORT_PER_CPU_SYMBOL(softnet_data
);
259 #ifdef CONFIG_LOCKDEP
261 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
262 * according to dev->type
264 static const unsigned short netdev_lock_type
[] =
265 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
266 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
267 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
268 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
269 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
270 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
271 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
272 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
273 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
274 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
275 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
276 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
277 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
278 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
279 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
281 static const char *const netdev_lock_name
[] =
282 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
283 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
284 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
285 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
286 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
287 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
288 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
289 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
290 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
291 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
292 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
293 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
294 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
295 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
296 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
298 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
299 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
301 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
305 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
306 if (netdev_lock_type
[i
] == dev_type
)
308 /* the last key is used by default */
309 return ARRAY_SIZE(netdev_lock_type
) - 1;
312 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
313 unsigned short dev_type
)
317 i
= netdev_lock_pos(dev_type
);
318 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
319 netdev_lock_name
[i
]);
322 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
326 i
= netdev_lock_pos(dev
->type
);
327 lockdep_set_class_and_name(&dev
->addr_list_lock
,
328 &netdev_addr_lock_key
[i
],
329 netdev_lock_name
[i
]);
332 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
333 unsigned short dev_type
)
336 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
341 /*******************************************************************************
343 Protocol management and registration routines
345 *******************************************************************************/
348 * Add a protocol ID to the list. Now that the input handler is
349 * smarter we can dispense with all the messy stuff that used to be
352 * BEWARE!!! Protocol handlers, mangling input packets,
353 * MUST BE last in hash buckets and checking protocol handlers
354 * MUST start from promiscuous ptype_all chain in net_bh.
355 * It is true now, do not change it.
356 * Explanation follows: if protocol handler, mangling packet, will
357 * be the first on list, it is not able to sense, that packet
358 * is cloned and should be copied-on-write, so that it will
359 * change it and subsequent readers will get broken packet.
363 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
365 if (pt
->type
== htons(ETH_P_ALL
))
368 return &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
372 * dev_add_pack - add packet handler
373 * @pt: packet type declaration
375 * Add a protocol handler to the networking stack. The passed &packet_type
376 * is linked into kernel lists and may not be freed until it has been
377 * removed from the kernel lists.
379 * This call does not sleep therefore it can not
380 * guarantee all CPU's that are in middle of receiving packets
381 * will see the new packet type (until the next received packet).
384 void dev_add_pack(struct packet_type
*pt
)
386 struct list_head
*head
= ptype_head(pt
);
388 spin_lock(&ptype_lock
);
389 list_add_rcu(&pt
->list
, head
);
390 spin_unlock(&ptype_lock
);
392 EXPORT_SYMBOL(dev_add_pack
);
395 * __dev_remove_pack - remove packet handler
396 * @pt: packet type declaration
398 * Remove a protocol handler that was previously added to the kernel
399 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
400 * from the kernel lists and can be freed or reused once this function
403 * The packet type might still be in use by receivers
404 * and must not be freed until after all the CPU's have gone
405 * through a quiescent state.
407 void __dev_remove_pack(struct packet_type
*pt
)
409 struct list_head
*head
= ptype_head(pt
);
410 struct packet_type
*pt1
;
412 spin_lock(&ptype_lock
);
414 list_for_each_entry(pt1
, head
, list
) {
416 list_del_rcu(&pt
->list
);
421 pr_warn("dev_remove_pack: %p not found\n", pt
);
423 spin_unlock(&ptype_lock
);
425 EXPORT_SYMBOL(__dev_remove_pack
);
428 * dev_remove_pack - remove packet handler
429 * @pt: packet type declaration
431 * Remove a protocol handler that was previously added to the kernel
432 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
433 * from the kernel lists and can be freed or reused once this function
436 * This call sleeps to guarantee that no CPU is looking at the packet
439 void dev_remove_pack(struct packet_type
*pt
)
441 __dev_remove_pack(pt
);
445 EXPORT_SYMBOL(dev_remove_pack
);
449 * dev_add_offload - register offload handlers
450 * @po: protocol offload declaration
452 * Add protocol offload handlers to the networking stack. The passed
453 * &proto_offload is linked into kernel lists and may not be freed until
454 * it has been removed from the kernel lists.
456 * This call does not sleep therefore it can not
457 * guarantee all CPU's that are in middle of receiving packets
458 * will see the new offload handlers (until the next received packet).
460 void dev_add_offload(struct packet_offload
*po
)
462 struct list_head
*head
= &offload_base
;
464 spin_lock(&offload_lock
);
465 list_add_rcu(&po
->list
, head
);
466 spin_unlock(&offload_lock
);
468 EXPORT_SYMBOL(dev_add_offload
);
471 * __dev_remove_offload - remove offload handler
472 * @po: packet offload declaration
474 * Remove a protocol offload handler that was previously added to the
475 * kernel offload handlers by dev_add_offload(). The passed &offload_type
476 * is removed from the kernel lists and can be freed or reused once this
479 * The packet type might still be in use by receivers
480 * and must not be freed until after all the CPU's have gone
481 * through a quiescent state.
483 static void __dev_remove_offload(struct packet_offload
*po
)
485 struct list_head
*head
= &offload_base
;
486 struct packet_offload
*po1
;
488 spin_lock(&offload_lock
);
490 list_for_each_entry(po1
, head
, list
) {
492 list_del_rcu(&po
->list
);
497 pr_warn("dev_remove_offload: %p not found\n", po
);
499 spin_unlock(&offload_lock
);
503 * dev_remove_offload - remove packet offload handler
504 * @po: packet offload declaration
506 * Remove a packet offload handler that was previously added to the kernel
507 * offload handlers by dev_add_offload(). The passed &offload_type is
508 * removed from the kernel lists and can be freed or reused once this
511 * This call sleeps to guarantee that no CPU is looking at the packet
514 void dev_remove_offload(struct packet_offload
*po
)
516 __dev_remove_offload(po
);
520 EXPORT_SYMBOL(dev_remove_offload
);
522 /******************************************************************************
524 Device Boot-time Settings Routines
526 *******************************************************************************/
528 /* Boot time configuration table */
529 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
532 * netdev_boot_setup_add - add new setup entry
533 * @name: name of the device
534 * @map: configured settings for the device
536 * Adds new setup entry to the dev_boot_setup list. The function
537 * returns 0 on error and 1 on success. This is a generic routine to
540 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
542 struct netdev_boot_setup
*s
;
546 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
547 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
548 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
549 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
550 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
555 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
559 * netdev_boot_setup_check - check boot time settings
560 * @dev: the netdevice
562 * Check boot time settings for the device.
563 * The found settings are set for the device to be used
564 * later in the device probing.
565 * Returns 0 if no settings found, 1 if they are.
567 int netdev_boot_setup_check(struct net_device
*dev
)
569 struct netdev_boot_setup
*s
= dev_boot_setup
;
572 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
573 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
574 !strcmp(dev
->name
, s
[i
].name
)) {
575 dev
->irq
= s
[i
].map
.irq
;
576 dev
->base_addr
= s
[i
].map
.base_addr
;
577 dev
->mem_start
= s
[i
].map
.mem_start
;
578 dev
->mem_end
= s
[i
].map
.mem_end
;
584 EXPORT_SYMBOL(netdev_boot_setup_check
);
588 * netdev_boot_base - get address from boot time settings
589 * @prefix: prefix for network device
590 * @unit: id for network device
592 * Check boot time settings for the base address of device.
593 * The found settings are set for the device to be used
594 * later in the device probing.
595 * Returns 0 if no settings found.
597 unsigned long netdev_boot_base(const char *prefix
, int unit
)
599 const struct netdev_boot_setup
*s
= dev_boot_setup
;
603 sprintf(name
, "%s%d", prefix
, unit
);
606 * If device already registered then return base of 1
607 * to indicate not to probe for this interface
609 if (__dev_get_by_name(&init_net
, name
))
612 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
613 if (!strcmp(name
, s
[i
].name
))
614 return s
[i
].map
.base_addr
;
619 * Saves at boot time configured settings for any netdevice.
621 int __init
netdev_boot_setup(char *str
)
626 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
631 memset(&map
, 0, sizeof(map
));
635 map
.base_addr
= ints
[2];
637 map
.mem_start
= ints
[3];
639 map
.mem_end
= ints
[4];
641 /* Add new entry to the list */
642 return netdev_boot_setup_add(str
, &map
);
645 __setup("netdev=", netdev_boot_setup
);
647 /*******************************************************************************
649 Device Interface Subroutines
651 *******************************************************************************/
654 * __dev_get_by_name - find a device by its name
655 * @net: the applicable net namespace
656 * @name: name to find
658 * Find an interface by name. Must be called under RTNL semaphore
659 * or @dev_base_lock. If the name is found a pointer to the device
660 * is returned. If the name is not found then %NULL is returned. The
661 * reference counters are not incremented so the caller must be
662 * careful with locks.
665 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
667 struct net_device
*dev
;
668 struct hlist_head
*head
= dev_name_hash(net
, name
);
670 hlist_for_each_entry(dev
, head
, name_hlist
)
671 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
676 EXPORT_SYMBOL(__dev_get_by_name
);
679 * dev_get_by_name_rcu - find a device by its name
680 * @net: the applicable net namespace
681 * @name: name to find
683 * Find an interface by name.
684 * If the name is found a pointer to the device is returned.
685 * If the name is not found then %NULL is returned.
686 * The reference counters are not incremented so the caller must be
687 * careful with locks. The caller must hold RCU lock.
690 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
692 struct net_device
*dev
;
693 struct hlist_head
*head
= dev_name_hash(net
, name
);
695 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
696 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
701 EXPORT_SYMBOL(dev_get_by_name_rcu
);
704 * dev_get_by_name - find a device by its name
705 * @net: the applicable net namespace
706 * @name: name to find
708 * Find an interface by name. This can be called from any
709 * context and does its own locking. The returned handle has
710 * the usage count incremented and the caller must use dev_put() to
711 * release it when it is no longer needed. %NULL is returned if no
712 * matching device is found.
715 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
717 struct net_device
*dev
;
720 dev
= dev_get_by_name_rcu(net
, name
);
726 EXPORT_SYMBOL(dev_get_by_name
);
729 * __dev_get_by_index - find a device by its ifindex
730 * @net: the applicable net namespace
731 * @ifindex: index of device
733 * Search for an interface by index. Returns %NULL if the device
734 * is not found or a pointer to the device. The device has not
735 * had its reference counter increased so the caller must be careful
736 * about locking. The caller must hold either the RTNL semaphore
740 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
742 struct net_device
*dev
;
743 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
745 hlist_for_each_entry(dev
, head
, index_hlist
)
746 if (dev
->ifindex
== ifindex
)
751 EXPORT_SYMBOL(__dev_get_by_index
);
754 * dev_get_by_index_rcu - find a device by its ifindex
755 * @net: the applicable net namespace
756 * @ifindex: index of device
758 * Search for an interface by index. Returns %NULL if the device
759 * is not found or a pointer to the device. The device has not
760 * had its reference counter increased so the caller must be careful
761 * about locking. The caller must hold RCU lock.
764 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
766 struct net_device
*dev
;
767 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
769 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
770 if (dev
->ifindex
== ifindex
)
775 EXPORT_SYMBOL(dev_get_by_index_rcu
);
779 * dev_get_by_index - find a device by its ifindex
780 * @net: the applicable net namespace
781 * @ifindex: index of device
783 * Search for an interface by index. Returns NULL if the device
784 * is not found or a pointer to the device. The device returned has
785 * had a reference added and the pointer is safe until the user calls
786 * dev_put to indicate they have finished with it.
789 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
791 struct net_device
*dev
;
794 dev
= dev_get_by_index_rcu(net
, ifindex
);
800 EXPORT_SYMBOL(dev_get_by_index
);
803 * netdev_get_name - get a netdevice name, knowing its ifindex.
804 * @net: network namespace
805 * @name: a pointer to the buffer where the name will be stored.
806 * @ifindex: the ifindex of the interface to get the name from.
808 * The use of raw_seqcount_begin() and cond_resched() before
809 * retrying is required as we want to give the writers a chance
810 * to complete when CONFIG_PREEMPT is not set.
812 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
814 struct net_device
*dev
;
818 seq
= raw_seqcount_begin(&devnet_rename_seq
);
820 dev
= dev_get_by_index_rcu(net
, ifindex
);
826 strcpy(name
, dev
->name
);
828 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
837 * dev_getbyhwaddr_rcu - find a device by its hardware address
838 * @net: the applicable net namespace
839 * @type: media type of device
840 * @ha: hardware address
842 * Search for an interface by MAC address. Returns NULL if the device
843 * is not found or a pointer to the device.
844 * The caller must hold RCU or RTNL.
845 * The returned device has not had its ref count increased
846 * and the caller must therefore be careful about locking
850 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
853 struct net_device
*dev
;
855 for_each_netdev_rcu(net
, dev
)
856 if (dev
->type
== type
&&
857 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
862 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
864 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
866 struct net_device
*dev
;
869 for_each_netdev(net
, dev
)
870 if (dev
->type
== type
)
875 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
877 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
879 struct net_device
*dev
, *ret
= NULL
;
882 for_each_netdev_rcu(net
, dev
)
883 if (dev
->type
== type
) {
891 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
894 * dev_get_by_flags_rcu - find any device with given flags
895 * @net: the applicable net namespace
896 * @if_flags: IFF_* values
897 * @mask: bitmask of bits in if_flags to check
899 * Search for any interface with the given flags. Returns NULL if a device
900 * is not found or a pointer to the device. Must be called inside
901 * rcu_read_lock(), and result refcount is unchanged.
904 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
907 struct net_device
*dev
, *ret
;
910 for_each_netdev_rcu(net
, dev
) {
911 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
918 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
921 * dev_valid_name - check if name is okay for network device
924 * Network device names need to be valid file names to
925 * to allow sysfs to work. We also disallow any kind of
928 bool dev_valid_name(const char *name
)
932 if (strlen(name
) >= IFNAMSIZ
)
934 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
938 if (*name
== '/' || isspace(*name
))
944 EXPORT_SYMBOL(dev_valid_name
);
947 * __dev_alloc_name - allocate a name for a device
948 * @net: network namespace to allocate the device name in
949 * @name: name format string
950 * @buf: scratch buffer and result name string
952 * Passed a format string - eg "lt%d" it will try and find a suitable
953 * id. It scans list of devices to build up a free map, then chooses
954 * the first empty slot. The caller must hold the dev_base or rtnl lock
955 * while allocating the name and adding the device in order to avoid
957 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
958 * Returns the number of the unit assigned or a negative errno code.
961 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
965 const int max_netdevices
= 8*PAGE_SIZE
;
966 unsigned long *inuse
;
967 struct net_device
*d
;
969 p
= strnchr(name
, IFNAMSIZ
-1, '%');
972 * Verify the string as this thing may have come from
973 * the user. There must be either one "%d" and no other "%"
976 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
979 /* Use one page as a bit array of possible slots */
980 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
984 for_each_netdev(net
, d
) {
985 if (!sscanf(d
->name
, name
, &i
))
987 if (i
< 0 || i
>= max_netdevices
)
990 /* avoid cases where sscanf is not exact inverse of printf */
991 snprintf(buf
, IFNAMSIZ
, name
, i
);
992 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
996 i
= find_first_zero_bit(inuse
, max_netdevices
);
997 free_page((unsigned long) inuse
);
1001 snprintf(buf
, IFNAMSIZ
, name
, i
);
1002 if (!__dev_get_by_name(net
, buf
))
1005 /* It is possible to run out of possible slots
1006 * when the name is long and there isn't enough space left
1007 * for the digits, or if all bits are used.
1013 * dev_alloc_name - allocate a name for a device
1015 * @name: name format string
1017 * Passed a format string - eg "lt%d" it will try and find a suitable
1018 * id. It scans list of devices to build up a free map, then chooses
1019 * the first empty slot. The caller must hold the dev_base or rtnl lock
1020 * while allocating the name and adding the device in order to avoid
1022 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1023 * Returns the number of the unit assigned or a negative errno code.
1026 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1032 BUG_ON(!dev_net(dev
));
1034 ret
= __dev_alloc_name(net
, name
, buf
);
1036 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1039 EXPORT_SYMBOL(dev_alloc_name
);
1041 static int dev_alloc_name_ns(struct net
*net
,
1042 struct net_device
*dev
,
1048 ret
= __dev_alloc_name(net
, name
, buf
);
1050 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1054 static int dev_get_valid_name(struct net
*net
,
1055 struct net_device
*dev
,
1060 if (!dev_valid_name(name
))
1063 if (strchr(name
, '%'))
1064 return dev_alloc_name_ns(net
, dev
, name
);
1065 else if (__dev_get_by_name(net
, name
))
1067 else if (dev
->name
!= name
)
1068 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1074 * dev_change_name - change name of a device
1076 * @newname: name (or format string) must be at least IFNAMSIZ
1078 * Change name of a device, can pass format strings "eth%d".
1081 int dev_change_name(struct net_device
*dev
, const char *newname
)
1083 char oldname
[IFNAMSIZ
];
1089 BUG_ON(!dev_net(dev
));
1092 if (dev
->flags
& IFF_UP
)
1095 write_seqcount_begin(&devnet_rename_seq
);
1097 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1098 write_seqcount_end(&devnet_rename_seq
);
1102 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1104 err
= dev_get_valid_name(net
, dev
, newname
);
1106 write_seqcount_end(&devnet_rename_seq
);
1111 ret
= device_rename(&dev
->dev
, dev
->name
);
1113 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1114 write_seqcount_end(&devnet_rename_seq
);
1118 write_seqcount_end(&devnet_rename_seq
);
1120 write_lock_bh(&dev_base_lock
);
1121 hlist_del_rcu(&dev
->name_hlist
);
1122 write_unlock_bh(&dev_base_lock
);
1126 write_lock_bh(&dev_base_lock
);
1127 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1128 write_unlock_bh(&dev_base_lock
);
1130 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1131 ret
= notifier_to_errno(ret
);
1134 /* err >= 0 after dev_alloc_name() or stores the first errno */
1137 write_seqcount_begin(&devnet_rename_seq
);
1138 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1141 pr_err("%s: name change rollback failed: %d\n",
1150 * dev_set_alias - change ifalias of a device
1152 * @alias: name up to IFALIASZ
1153 * @len: limit of bytes to copy from info
1155 * Set ifalias for a device,
1157 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1163 if (len
>= IFALIASZ
)
1167 kfree(dev
->ifalias
);
1168 dev
->ifalias
= NULL
;
1172 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1175 dev
->ifalias
= new_ifalias
;
1177 strlcpy(dev
->ifalias
, alias
, len
+1);
1183 * netdev_features_change - device changes features
1184 * @dev: device to cause notification
1186 * Called to indicate a device has changed features.
1188 void netdev_features_change(struct net_device
*dev
)
1190 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1192 EXPORT_SYMBOL(netdev_features_change
);
1195 * netdev_state_change - device changes state
1196 * @dev: device to cause notification
1198 * Called to indicate a device has changed state. This function calls
1199 * the notifier chains for netdev_chain and sends a NEWLINK message
1200 * to the routing socket.
1202 void netdev_state_change(struct net_device
*dev
)
1204 if (dev
->flags
& IFF_UP
) {
1205 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1206 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1209 EXPORT_SYMBOL(netdev_state_change
);
1212 * netdev_notify_peers - notify network peers about existence of @dev
1213 * @dev: network device
1215 * Generate traffic such that interested network peers are aware of
1216 * @dev, such as by generating a gratuitous ARP. This may be used when
1217 * a device wants to inform the rest of the network about some sort of
1218 * reconfiguration such as a failover event or virtual machine
1221 void netdev_notify_peers(struct net_device
*dev
)
1224 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1227 EXPORT_SYMBOL(netdev_notify_peers
);
1229 static int __dev_open(struct net_device
*dev
)
1231 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1236 if (!netif_device_present(dev
))
1239 /* Block netpoll from trying to do any rx path servicing.
1240 * If we don't do this there is a chance ndo_poll_controller
1241 * or ndo_poll may be running while we open the device
1243 netpoll_rx_disable(dev
);
1245 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1246 ret
= notifier_to_errno(ret
);
1250 set_bit(__LINK_STATE_START
, &dev
->state
);
1252 if (ops
->ndo_validate_addr
)
1253 ret
= ops
->ndo_validate_addr(dev
);
1255 if (!ret
&& ops
->ndo_open
)
1256 ret
= ops
->ndo_open(dev
);
1258 netpoll_rx_enable(dev
);
1261 clear_bit(__LINK_STATE_START
, &dev
->state
);
1263 dev
->flags
|= IFF_UP
;
1264 net_dmaengine_get();
1265 dev_set_rx_mode(dev
);
1267 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1274 * dev_open - prepare an interface for use.
1275 * @dev: device to open
1277 * Takes a device from down to up state. The device's private open
1278 * function is invoked and then the multicast lists are loaded. Finally
1279 * the device is moved into the up state and a %NETDEV_UP message is
1280 * sent to the netdev notifier chain.
1282 * Calling this function on an active interface is a nop. On a failure
1283 * a negative errno code is returned.
1285 int dev_open(struct net_device
*dev
)
1289 if (dev
->flags
& IFF_UP
)
1292 ret
= __dev_open(dev
);
1296 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1297 call_netdevice_notifiers(NETDEV_UP
, dev
);
1301 EXPORT_SYMBOL(dev_open
);
1303 static int __dev_close_many(struct list_head
*head
)
1305 struct net_device
*dev
;
1310 list_for_each_entry(dev
, head
, close_list
) {
1311 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1313 clear_bit(__LINK_STATE_START
, &dev
->state
);
1315 /* Synchronize to scheduled poll. We cannot touch poll list, it
1316 * can be even on different cpu. So just clear netif_running().
1318 * dev->stop() will invoke napi_disable() on all of it's
1319 * napi_struct instances on this device.
1321 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1324 dev_deactivate_many(head
);
1326 list_for_each_entry(dev
, head
, close_list
) {
1327 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1330 * Call the device specific close. This cannot fail.
1331 * Only if device is UP
1333 * We allow it to be called even after a DETACH hot-plug
1339 dev
->flags
&= ~IFF_UP
;
1340 net_dmaengine_put();
1346 static int __dev_close(struct net_device
*dev
)
1351 /* Temporarily disable netpoll until the interface is down */
1352 netpoll_rx_disable(dev
);
1354 list_add(&dev
->close_list
, &single
);
1355 retval
= __dev_close_many(&single
);
1358 netpoll_rx_enable(dev
);
1362 static int dev_close_many(struct list_head
*head
)
1364 struct net_device
*dev
, *tmp
;
1366 /* Remove the devices that don't need to be closed */
1367 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1368 if (!(dev
->flags
& IFF_UP
))
1369 list_del_init(&dev
->close_list
);
1371 __dev_close_many(head
);
1373 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1374 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1375 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1376 list_del_init(&dev
->close_list
);
1383 * dev_close - shutdown an interface.
1384 * @dev: device to shutdown
1386 * This function moves an active device into down state. A
1387 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1388 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1391 int dev_close(struct net_device
*dev
)
1393 if (dev
->flags
& IFF_UP
) {
1396 /* Block netpoll rx while the interface is going down */
1397 netpoll_rx_disable(dev
);
1399 list_add(&dev
->close_list
, &single
);
1400 dev_close_many(&single
);
1403 netpoll_rx_enable(dev
);
1407 EXPORT_SYMBOL(dev_close
);
1411 * dev_disable_lro - disable Large Receive Offload on a device
1414 * Disable Large Receive Offload (LRO) on a net device. Must be
1415 * called under RTNL. This is needed if received packets may be
1416 * forwarded to another interface.
1418 void dev_disable_lro(struct net_device
*dev
)
1421 * If we're trying to disable lro on a vlan device
1422 * use the underlying physical device instead
1424 if (is_vlan_dev(dev
))
1425 dev
= vlan_dev_real_dev(dev
);
1427 /* the same for macvlan devices */
1428 if (netif_is_macvlan(dev
))
1429 dev
= macvlan_dev_real_dev(dev
);
1431 dev
->wanted_features
&= ~NETIF_F_LRO
;
1432 netdev_update_features(dev
);
1434 if (unlikely(dev
->features
& NETIF_F_LRO
))
1435 netdev_WARN(dev
, "failed to disable LRO!\n");
1437 EXPORT_SYMBOL(dev_disable_lro
);
1439 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1440 struct net_device
*dev
)
1442 struct netdev_notifier_info info
;
1444 netdev_notifier_info_init(&info
, dev
);
1445 return nb
->notifier_call(nb
, val
, &info
);
1448 static int dev_boot_phase
= 1;
1451 * register_netdevice_notifier - register a network notifier block
1454 * Register a notifier to be called when network device events occur.
1455 * The notifier passed is linked into the kernel structures and must
1456 * not be reused until it has been unregistered. A negative errno code
1457 * is returned on a failure.
1459 * When registered all registration and up events are replayed
1460 * to the new notifier to allow device to have a race free
1461 * view of the network device list.
1464 int register_netdevice_notifier(struct notifier_block
*nb
)
1466 struct net_device
*dev
;
1467 struct net_device
*last
;
1472 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1478 for_each_netdev(net
, dev
) {
1479 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1480 err
= notifier_to_errno(err
);
1484 if (!(dev
->flags
& IFF_UP
))
1487 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1498 for_each_netdev(net
, dev
) {
1502 if (dev
->flags
& IFF_UP
) {
1503 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1505 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1507 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1512 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1515 EXPORT_SYMBOL(register_netdevice_notifier
);
1518 * unregister_netdevice_notifier - unregister a network notifier block
1521 * Unregister a notifier previously registered by
1522 * register_netdevice_notifier(). The notifier is unlinked into the
1523 * kernel structures and may then be reused. A negative errno code
1524 * is returned on a failure.
1526 * After unregistering unregister and down device events are synthesized
1527 * for all devices on the device list to the removed notifier to remove
1528 * the need for special case cleanup code.
1531 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1533 struct net_device
*dev
;
1538 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1543 for_each_netdev(net
, dev
) {
1544 if (dev
->flags
& IFF_UP
) {
1545 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1547 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1549 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1556 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1559 * call_netdevice_notifiers_info - call all network notifier blocks
1560 * @val: value passed unmodified to notifier function
1561 * @dev: net_device pointer passed unmodified to notifier function
1562 * @info: notifier information data
1564 * Call all network notifier blocks. Parameters and return value
1565 * are as for raw_notifier_call_chain().
1568 static int call_netdevice_notifiers_info(unsigned long val
,
1569 struct net_device
*dev
,
1570 struct netdev_notifier_info
*info
)
1573 netdev_notifier_info_init(info
, dev
);
1574 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1578 * call_netdevice_notifiers - call all network notifier blocks
1579 * @val: value passed unmodified to notifier function
1580 * @dev: net_device pointer passed unmodified to notifier function
1582 * Call all network notifier blocks. Parameters and return value
1583 * are as for raw_notifier_call_chain().
1586 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1588 struct netdev_notifier_info info
;
1590 return call_netdevice_notifiers_info(val
, dev
, &info
);
1592 EXPORT_SYMBOL(call_netdevice_notifiers
);
1594 static struct static_key netstamp_needed __read_mostly
;
1595 #ifdef HAVE_JUMP_LABEL
1596 /* We are not allowed to call static_key_slow_dec() from irq context
1597 * If net_disable_timestamp() is called from irq context, defer the
1598 * static_key_slow_dec() calls.
1600 static atomic_t netstamp_needed_deferred
;
1603 void net_enable_timestamp(void)
1605 #ifdef HAVE_JUMP_LABEL
1606 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1610 static_key_slow_dec(&netstamp_needed
);
1614 static_key_slow_inc(&netstamp_needed
);
1616 EXPORT_SYMBOL(net_enable_timestamp
);
1618 void net_disable_timestamp(void)
1620 #ifdef HAVE_JUMP_LABEL
1621 if (in_interrupt()) {
1622 atomic_inc(&netstamp_needed_deferred
);
1626 static_key_slow_dec(&netstamp_needed
);
1628 EXPORT_SYMBOL(net_disable_timestamp
);
1630 static inline void net_timestamp_set(struct sk_buff
*skb
)
1632 skb
->tstamp
.tv64
= 0;
1633 if (static_key_false(&netstamp_needed
))
1634 __net_timestamp(skb
);
1637 #define net_timestamp_check(COND, SKB) \
1638 if (static_key_false(&netstamp_needed)) { \
1639 if ((COND) && !(SKB)->tstamp.tv64) \
1640 __net_timestamp(SKB); \
1643 static inline bool is_skb_forwardable(struct net_device *dev,
1644 struct sk_buff
*skb
)
1648 if (!(dev
->flags
& IFF_UP
))
1651 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1652 if (skb
->len
<= len
)
1655 /* if TSO is enabled, we don't care about the length as the packet
1656 * could be forwarded without being segmented before
1658 if (skb_is_gso(skb
))
1665 * dev_forward_skb - loopback an skb to another netif
1667 * @dev: destination network device
1668 * @skb: buffer to forward
1671 * NET_RX_SUCCESS (no congestion)
1672 * NET_RX_DROP (packet was dropped, but freed)
1674 * dev_forward_skb can be used for injecting an skb from the
1675 * start_xmit function of one device into the receive queue
1676 * of another device.
1678 * The receiving device may be in another namespace, so
1679 * we have to clear all information in the skb that could
1680 * impact namespace isolation.
1682 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1684 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1685 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1686 atomic_long_inc(&dev
->rx_dropped
);
1692 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1693 atomic_long_inc(&dev
->rx_dropped
);
1698 skb_scrub_packet(skb
, true);
1699 skb
->protocol
= eth_type_trans(skb
, dev
);
1701 return netif_rx(skb
);
1703 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1705 static inline int deliver_skb(struct sk_buff
*skb
,
1706 struct packet_type
*pt_prev
,
1707 struct net_device
*orig_dev
)
1709 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1711 atomic_inc(&skb
->users
);
1712 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1715 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1717 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1720 if (ptype
->id_match
)
1721 return ptype
->id_match(ptype
, skb
->sk
);
1722 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1729 * Support routine. Sends outgoing frames to any network
1730 * taps currently in use.
1733 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1735 struct packet_type
*ptype
;
1736 struct sk_buff
*skb2
= NULL
;
1737 struct packet_type
*pt_prev
= NULL
;
1740 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1741 /* Never send packets back to the socket
1742 * they originated from - MvS (miquels@drinkel.ow.org)
1744 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1745 (!skb_loop_sk(ptype
, skb
))) {
1747 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1752 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1756 net_timestamp_set(skb2
);
1758 /* skb->nh should be correctly
1759 set by sender, so that the second statement is
1760 just protection against buggy protocols.
1762 skb_reset_mac_header(skb2
);
1764 if (skb_network_header(skb2
) < skb2
->data
||
1765 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1766 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1767 ntohs(skb2
->protocol
),
1769 skb_reset_network_header(skb2
);
1772 skb2
->transport_header
= skb2
->network_header
;
1773 skb2
->pkt_type
= PACKET_OUTGOING
;
1778 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1783 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1784 * @dev: Network device
1785 * @txq: number of queues available
1787 * If real_num_tx_queues is changed the tc mappings may no longer be
1788 * valid. To resolve this verify the tc mapping remains valid and if
1789 * not NULL the mapping. With no priorities mapping to this
1790 * offset/count pair it will no longer be used. In the worst case TC0
1791 * is invalid nothing can be done so disable priority mappings. If is
1792 * expected that drivers will fix this mapping if they can before
1793 * calling netif_set_real_num_tx_queues.
1795 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1798 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1800 /* If TC0 is invalidated disable TC mapping */
1801 if (tc
->offset
+ tc
->count
> txq
) {
1802 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1807 /* Invalidated prio to tc mappings set to TC0 */
1808 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1809 int q
= netdev_get_prio_tc_map(dev
, i
);
1811 tc
= &dev
->tc_to_txq
[q
];
1812 if (tc
->offset
+ tc
->count
> txq
) {
1813 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1815 netdev_set_prio_tc_map(dev
, i
, 0);
1821 static DEFINE_MUTEX(xps_map_mutex
);
1822 #define xmap_dereference(P) \
1823 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1825 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1828 struct xps_map
*map
= NULL
;
1832 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1834 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1835 if (map
->queues
[pos
] == index
) {
1837 map
->queues
[pos
] = map
->queues
[--map
->len
];
1839 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1840 kfree_rcu(map
, rcu
);
1850 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1852 struct xps_dev_maps
*dev_maps
;
1854 bool active
= false;
1856 mutex_lock(&xps_map_mutex
);
1857 dev_maps
= xmap_dereference(dev
->xps_maps
);
1862 for_each_possible_cpu(cpu
) {
1863 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1864 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1867 if (i
== dev
->num_tx_queues
)
1872 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1873 kfree_rcu(dev_maps
, rcu
);
1876 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1877 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1881 mutex_unlock(&xps_map_mutex
);
1884 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1887 struct xps_map
*new_map
;
1888 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1891 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1892 if (map
->queues
[pos
] != index
)
1897 /* Need to add queue to this CPU's existing map */
1899 if (pos
< map
->alloc_len
)
1902 alloc_len
= map
->alloc_len
* 2;
1905 /* Need to allocate new map to store queue on this CPU's map */
1906 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1911 for (i
= 0; i
< pos
; i
++)
1912 new_map
->queues
[i
] = map
->queues
[i
];
1913 new_map
->alloc_len
= alloc_len
;
1919 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
1922 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
1923 struct xps_map
*map
, *new_map
;
1924 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
1925 int cpu
, numa_node_id
= -2;
1926 bool active
= false;
1928 mutex_lock(&xps_map_mutex
);
1930 dev_maps
= xmap_dereference(dev
->xps_maps
);
1932 /* allocate memory for queue storage */
1933 for_each_online_cpu(cpu
) {
1934 if (!cpumask_test_cpu(cpu
, mask
))
1938 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
1939 if (!new_dev_maps
) {
1940 mutex_unlock(&xps_map_mutex
);
1944 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1947 map
= expand_xps_map(map
, cpu
, index
);
1951 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1955 goto out_no_new_maps
;
1957 for_each_possible_cpu(cpu
) {
1958 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
1959 /* add queue to CPU maps */
1962 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1963 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
1966 if (pos
== map
->len
)
1967 map
->queues
[map
->len
++] = index
;
1969 if (numa_node_id
== -2)
1970 numa_node_id
= cpu_to_node(cpu
);
1971 else if (numa_node_id
!= cpu_to_node(cpu
))
1974 } else if (dev_maps
) {
1975 /* fill in the new device map from the old device map */
1976 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1977 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1982 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
1984 /* Cleanup old maps */
1986 for_each_possible_cpu(cpu
) {
1987 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1988 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1989 if (map
&& map
!= new_map
)
1990 kfree_rcu(map
, rcu
);
1993 kfree_rcu(dev_maps
, rcu
);
1996 dev_maps
= new_dev_maps
;
2000 /* update Tx queue numa node */
2001 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2002 (numa_node_id
>= 0) ? numa_node_id
:
2008 /* removes queue from unused CPUs */
2009 for_each_possible_cpu(cpu
) {
2010 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2013 if (remove_xps_queue(dev_maps
, cpu
, index
))
2017 /* free map if not active */
2019 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2020 kfree_rcu(dev_maps
, rcu
);
2024 mutex_unlock(&xps_map_mutex
);
2028 /* remove any maps that we added */
2029 for_each_possible_cpu(cpu
) {
2030 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2031 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2033 if (new_map
&& new_map
!= map
)
2037 mutex_unlock(&xps_map_mutex
);
2039 kfree(new_dev_maps
);
2042 EXPORT_SYMBOL(netif_set_xps_queue
);
2046 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2047 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2049 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2053 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2056 if (dev
->reg_state
== NETREG_REGISTERED
||
2057 dev
->reg_state
== NETREG_UNREGISTERING
) {
2060 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2066 netif_setup_tc(dev
, txq
);
2068 if (txq
< dev
->real_num_tx_queues
) {
2069 qdisc_reset_all_tx_gt(dev
, txq
);
2071 netif_reset_xps_queues_gt(dev
, txq
);
2076 dev
->real_num_tx_queues
= txq
;
2079 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2083 * netif_set_real_num_rx_queues - set actual number of RX queues used
2084 * @dev: Network device
2085 * @rxq: Actual number of RX queues
2087 * This must be called either with the rtnl_lock held or before
2088 * registration of the net device. Returns 0 on success, or a
2089 * negative error code. If called before registration, it always
2092 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2096 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2099 if (dev
->reg_state
== NETREG_REGISTERED
) {
2102 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2108 dev
->real_num_rx_queues
= rxq
;
2111 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2115 * netif_get_num_default_rss_queues - default number of RSS queues
2117 * This routine should set an upper limit on the number of RSS queues
2118 * used by default by multiqueue devices.
2120 int netif_get_num_default_rss_queues(void)
2122 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2124 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2126 static inline void __netif_reschedule(struct Qdisc
*q
)
2128 struct softnet_data
*sd
;
2129 unsigned long flags
;
2131 local_irq_save(flags
);
2132 sd
= &__get_cpu_var(softnet_data
);
2133 q
->next_sched
= NULL
;
2134 *sd
->output_queue_tailp
= q
;
2135 sd
->output_queue_tailp
= &q
->next_sched
;
2136 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2137 local_irq_restore(flags
);
2140 void __netif_schedule(struct Qdisc
*q
)
2142 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2143 __netif_reschedule(q
);
2145 EXPORT_SYMBOL(__netif_schedule
);
2147 struct dev_kfree_skb_cb
{
2148 enum skb_free_reason reason
;
2151 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2153 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2156 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2158 unsigned long flags
;
2160 if (likely(atomic_read(&skb
->users
) == 1)) {
2162 atomic_set(&skb
->users
, 0);
2163 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2166 get_kfree_skb_cb(skb
)->reason
= reason
;
2167 local_irq_save(flags
);
2168 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2169 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2170 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2171 local_irq_restore(flags
);
2173 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2175 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2177 if (in_irq() || irqs_disabled())
2178 __dev_kfree_skb_irq(skb
, reason
);
2182 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2186 * netif_device_detach - mark device as removed
2187 * @dev: network device
2189 * Mark device as removed from system and therefore no longer available.
2191 void netif_device_detach(struct net_device
*dev
)
2193 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2194 netif_running(dev
)) {
2195 netif_tx_stop_all_queues(dev
);
2198 EXPORT_SYMBOL(netif_device_detach
);
2201 * netif_device_attach - mark device as attached
2202 * @dev: network device
2204 * Mark device as attached from system and restart if needed.
2206 void netif_device_attach(struct net_device
*dev
)
2208 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2209 netif_running(dev
)) {
2210 netif_tx_wake_all_queues(dev
);
2211 __netdev_watchdog_up(dev
);
2214 EXPORT_SYMBOL(netif_device_attach
);
2216 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2218 static const netdev_features_t null_features
= 0;
2219 struct net_device
*dev
= skb
->dev
;
2220 const char *driver
= "";
2222 if (!net_ratelimit())
2225 if (dev
&& dev
->dev
.parent
)
2226 driver
= dev_driver_string(dev
->dev
.parent
);
2228 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2229 "gso_type=%d ip_summed=%d\n",
2230 driver
, dev
? &dev
->features
: &null_features
,
2231 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2232 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2233 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2237 * Invalidate hardware checksum when packet is to be mangled, and
2238 * complete checksum manually on outgoing path.
2240 int skb_checksum_help(struct sk_buff
*skb
)
2243 int ret
= 0, offset
;
2245 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2246 goto out_set_summed
;
2248 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2249 skb_warn_bad_offload(skb
);
2253 /* Before computing a checksum, we should make sure no frag could
2254 * be modified by an external entity : checksum could be wrong.
2256 if (skb_has_shared_frag(skb
)) {
2257 ret
= __skb_linearize(skb
);
2262 offset
= skb_checksum_start_offset(skb
);
2263 BUG_ON(offset
>= skb_headlen(skb
));
2264 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2266 offset
+= skb
->csum_offset
;
2267 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2269 if (skb_cloned(skb
) &&
2270 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2271 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2276 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2278 skb
->ip_summed
= CHECKSUM_NONE
;
2282 EXPORT_SYMBOL(skb_checksum_help
);
2284 __be16
skb_network_protocol(struct sk_buff
*skb
)
2286 __be16 type
= skb
->protocol
;
2287 int vlan_depth
= ETH_HLEN
;
2289 /* Tunnel gso handlers can set protocol to ethernet. */
2290 if (type
== htons(ETH_P_TEB
)) {
2293 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2296 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2297 type
= eth
->h_proto
;
2300 while (type
== htons(ETH_P_8021Q
) || type
== htons(ETH_P_8021AD
)) {
2301 struct vlan_hdr
*vh
;
2303 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
2306 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
2307 type
= vh
->h_vlan_encapsulated_proto
;
2308 vlan_depth
+= VLAN_HLEN
;
2315 * skb_mac_gso_segment - mac layer segmentation handler.
2316 * @skb: buffer to segment
2317 * @features: features for the output path (see dev->features)
2319 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2320 netdev_features_t features
)
2322 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2323 struct packet_offload
*ptype
;
2324 __be16 type
= skb_network_protocol(skb
);
2326 if (unlikely(!type
))
2327 return ERR_PTR(-EINVAL
);
2329 __skb_pull(skb
, skb
->mac_len
);
2332 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2333 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2334 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2337 err
= ptype
->callbacks
.gso_send_check(skb
);
2338 segs
= ERR_PTR(err
);
2339 if (err
|| skb_gso_ok(skb
, features
))
2341 __skb_push(skb
, (skb
->data
-
2342 skb_network_header(skb
)));
2344 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2350 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2354 EXPORT_SYMBOL(skb_mac_gso_segment
);
2357 /* openvswitch calls this on rx path, so we need a different check.
2359 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2362 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2364 return skb
->ip_summed
== CHECKSUM_NONE
;
2368 * __skb_gso_segment - Perform segmentation on skb.
2369 * @skb: buffer to segment
2370 * @features: features for the output path (see dev->features)
2371 * @tx_path: whether it is called in TX path
2373 * This function segments the given skb and returns a list of segments.
2375 * It may return NULL if the skb requires no segmentation. This is
2376 * only possible when GSO is used for verifying header integrity.
2378 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2379 netdev_features_t features
, bool tx_path
)
2381 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2384 skb_warn_bad_offload(skb
);
2386 if (skb_header_cloned(skb
) &&
2387 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
2388 return ERR_PTR(err
);
2391 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2392 SKB_GSO_CB(skb
)->encap_level
= 0;
2394 skb_reset_mac_header(skb
);
2395 skb_reset_mac_len(skb
);
2397 return skb_mac_gso_segment(skb
, features
);
2399 EXPORT_SYMBOL(__skb_gso_segment
);
2401 /* Take action when hardware reception checksum errors are detected. */
2403 void netdev_rx_csum_fault(struct net_device
*dev
)
2405 if (net_ratelimit()) {
2406 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2410 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2413 /* Actually, we should eliminate this check as soon as we know, that:
2414 * 1. IOMMU is present and allows to map all the memory.
2415 * 2. No high memory really exists on this machine.
2418 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2420 #ifdef CONFIG_HIGHMEM
2422 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2423 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2424 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2425 if (PageHighMem(skb_frag_page(frag
)))
2430 if (PCI_DMA_BUS_IS_PHYS
) {
2431 struct device
*pdev
= dev
->dev
.parent
;
2435 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2436 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2437 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2438 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2447 void (*destructor
)(struct sk_buff
*skb
);
2450 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2452 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2454 struct dev_gso_cb
*cb
;
2456 kfree_skb_list(skb
->next
);
2459 cb
= DEV_GSO_CB(skb
);
2461 cb
->destructor(skb
);
2465 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2466 * @skb: buffer to segment
2467 * @features: device features as applicable to this skb
2469 * This function segments the given skb and stores the list of segments
2472 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2474 struct sk_buff
*segs
;
2476 segs
= skb_gso_segment(skb
, features
);
2478 /* Verifying header integrity only. */
2483 return PTR_ERR(segs
);
2486 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2487 skb
->destructor
= dev_gso_skb_destructor
;
2492 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2493 netdev_features_t features
)
2495 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2496 !can_checksum_protocol(features
, skb_network_protocol(skb
))) {
2497 features
&= ~NETIF_F_ALL_CSUM
;
2498 } else if (illegal_highdma(skb
->dev
, skb
)) {
2499 features
&= ~NETIF_F_SG
;
2505 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2507 __be16 protocol
= skb
->protocol
;
2508 netdev_features_t features
= skb
->dev
->features
;
2510 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2511 features
&= ~NETIF_F_GSO_MASK
;
2513 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
)) {
2514 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2515 protocol
= veh
->h_vlan_encapsulated_proto
;
2516 } else if (!vlan_tx_tag_present(skb
)) {
2517 return harmonize_features(skb
, features
);
2520 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_CTAG_TX
|
2521 NETIF_F_HW_VLAN_STAG_TX
);
2523 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
))
2524 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2525 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_CTAG_TX
|
2526 NETIF_F_HW_VLAN_STAG_TX
;
2528 return harmonize_features(skb
, features
);
2530 EXPORT_SYMBOL(netif_skb_features
);
2532 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2533 struct netdev_queue
*txq
)
2535 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2536 int rc
= NETDEV_TX_OK
;
2537 unsigned int skb_len
;
2539 if (likely(!skb
->next
)) {
2540 netdev_features_t features
;
2543 * If device doesn't need skb->dst, release it right now while
2544 * its hot in this cpu cache
2546 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2549 features
= netif_skb_features(skb
);
2551 if (vlan_tx_tag_present(skb
) &&
2552 !vlan_hw_offload_capable(features
, skb
->vlan_proto
)) {
2553 skb
= __vlan_put_tag(skb
, skb
->vlan_proto
,
2554 vlan_tx_tag_get(skb
));
2561 /* If encapsulation offload request, verify we are testing
2562 * hardware encapsulation features instead of standard
2563 * features for the netdev
2565 if (skb
->encapsulation
)
2566 features
&= dev
->hw_enc_features
;
2568 if (netif_needs_gso(skb
, features
)) {
2569 if (unlikely(dev_gso_segment(skb
, features
)))
2574 if (skb_needs_linearize(skb
, features
) &&
2575 __skb_linearize(skb
))
2578 /* If packet is not checksummed and device does not
2579 * support checksumming for this protocol, complete
2580 * checksumming here.
2582 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2583 if (skb
->encapsulation
)
2584 skb_set_inner_transport_header(skb
,
2585 skb_checksum_start_offset(skb
));
2587 skb_set_transport_header(skb
,
2588 skb_checksum_start_offset(skb
));
2589 if (!(features
& NETIF_F_ALL_CSUM
) &&
2590 skb_checksum_help(skb
))
2595 if (!list_empty(&ptype_all
))
2596 dev_queue_xmit_nit(skb
, dev
);
2599 trace_net_dev_start_xmit(skb
, dev
);
2600 rc
= ops
->ndo_start_xmit(skb
, dev
);
2601 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2602 if (rc
== NETDEV_TX_OK
)
2603 txq_trans_update(txq
);
2609 struct sk_buff
*nskb
= skb
->next
;
2611 skb
->next
= nskb
->next
;
2614 if (!list_empty(&ptype_all
))
2615 dev_queue_xmit_nit(nskb
, dev
);
2617 skb_len
= nskb
->len
;
2618 trace_net_dev_start_xmit(nskb
, dev
);
2619 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2620 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2621 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2622 if (rc
& ~NETDEV_TX_MASK
)
2623 goto out_kfree_gso_skb
;
2624 nskb
->next
= skb
->next
;
2628 txq_trans_update(txq
);
2629 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2630 return NETDEV_TX_BUSY
;
2631 } while (skb
->next
);
2634 if (likely(skb
->next
== NULL
)) {
2635 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2644 EXPORT_SYMBOL_GPL(dev_hard_start_xmit
);
2646 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2648 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2650 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2652 /* To get more precise estimation of bytes sent on wire,
2653 * we add to pkt_len the headers size of all segments
2655 if (shinfo
->gso_size
) {
2656 unsigned int hdr_len
;
2657 u16 gso_segs
= shinfo
->gso_segs
;
2659 /* mac layer + network layer */
2660 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2662 /* + transport layer */
2663 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2664 hdr_len
+= tcp_hdrlen(skb
);
2666 hdr_len
+= sizeof(struct udphdr
);
2668 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2669 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2672 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2676 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2677 struct net_device
*dev
,
2678 struct netdev_queue
*txq
)
2680 spinlock_t
*root_lock
= qdisc_lock(q
);
2684 qdisc_pkt_len_init(skb
);
2685 qdisc_calculate_pkt_len(skb
, q
);
2687 * Heuristic to force contended enqueues to serialize on a
2688 * separate lock before trying to get qdisc main lock.
2689 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2690 * and dequeue packets faster.
2692 contended
= qdisc_is_running(q
);
2693 if (unlikely(contended
))
2694 spin_lock(&q
->busylock
);
2696 spin_lock(root_lock
);
2697 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2700 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2701 qdisc_run_begin(q
)) {
2703 * This is a work-conserving queue; there are no old skbs
2704 * waiting to be sent out; and the qdisc is not running -
2705 * xmit the skb directly.
2707 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2710 qdisc_bstats_update(q
, skb
);
2712 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2713 if (unlikely(contended
)) {
2714 spin_unlock(&q
->busylock
);
2721 rc
= NET_XMIT_SUCCESS
;
2724 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2725 if (qdisc_run_begin(q
)) {
2726 if (unlikely(contended
)) {
2727 spin_unlock(&q
->busylock
);
2733 spin_unlock(root_lock
);
2734 if (unlikely(contended
))
2735 spin_unlock(&q
->busylock
);
2739 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2740 static void skb_update_prio(struct sk_buff
*skb
)
2742 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2744 if (!skb
->priority
&& skb
->sk
&& map
) {
2745 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2747 if (prioidx
< map
->priomap_len
)
2748 skb
->priority
= map
->priomap
[prioidx
];
2752 #define skb_update_prio(skb)
2755 static DEFINE_PER_CPU(int, xmit_recursion
);
2756 #define RECURSION_LIMIT 10
2759 * dev_loopback_xmit - loop back @skb
2760 * @skb: buffer to transmit
2762 int dev_loopback_xmit(struct sk_buff
*skb
)
2764 skb_reset_mac_header(skb
);
2765 __skb_pull(skb
, skb_network_offset(skb
));
2766 skb
->pkt_type
= PACKET_LOOPBACK
;
2767 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2768 WARN_ON(!skb_dst(skb
));
2773 EXPORT_SYMBOL(dev_loopback_xmit
);
2776 * dev_queue_xmit - transmit a buffer
2777 * @skb: buffer to transmit
2779 * Queue a buffer for transmission to a network device. The caller must
2780 * have set the device and priority and built the buffer before calling
2781 * this function. The function can be called from an interrupt.
2783 * A negative errno code is returned on a failure. A success does not
2784 * guarantee the frame will be transmitted as it may be dropped due
2785 * to congestion or traffic shaping.
2787 * -----------------------------------------------------------------------------------
2788 * I notice this method can also return errors from the queue disciplines,
2789 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2792 * Regardless of the return value, the skb is consumed, so it is currently
2793 * difficult to retry a send to this method. (You can bump the ref count
2794 * before sending to hold a reference for retry if you are careful.)
2796 * When calling this method, interrupts MUST be enabled. This is because
2797 * the BH enable code must have IRQs enabled so that it will not deadlock.
2800 int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
2802 struct net_device
*dev
= skb
->dev
;
2803 struct netdev_queue
*txq
;
2807 skb_reset_mac_header(skb
);
2809 /* Disable soft irqs for various locks below. Also
2810 * stops preemption for RCU.
2814 skb_update_prio(skb
);
2816 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
2817 q
= rcu_dereference_bh(txq
->qdisc
);
2819 #ifdef CONFIG_NET_CLS_ACT
2820 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2822 trace_net_dev_queue(skb
);
2824 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2828 /* The device has no queue. Common case for software devices:
2829 loopback, all the sorts of tunnels...
2831 Really, it is unlikely that netif_tx_lock protection is necessary
2832 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2834 However, it is possible, that they rely on protection
2837 Check this and shot the lock. It is not prone from deadlocks.
2838 Either shot noqueue qdisc, it is even simpler 8)
2840 if (dev
->flags
& IFF_UP
) {
2841 int cpu
= smp_processor_id(); /* ok because BHs are off */
2843 if (txq
->xmit_lock_owner
!= cpu
) {
2845 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2846 goto recursion_alert
;
2848 HARD_TX_LOCK(dev
, txq
, cpu
);
2850 if (!netif_xmit_stopped(txq
)) {
2851 __this_cpu_inc(xmit_recursion
);
2852 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2853 __this_cpu_dec(xmit_recursion
);
2854 if (dev_xmit_complete(rc
)) {
2855 HARD_TX_UNLOCK(dev
, txq
);
2859 HARD_TX_UNLOCK(dev
, txq
);
2860 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2863 /* Recursion is detected! It is possible,
2867 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2873 rcu_read_unlock_bh();
2878 rcu_read_unlock_bh();
2882 int dev_queue_xmit(struct sk_buff
*skb
)
2884 return __dev_queue_xmit(skb
, NULL
);
2886 EXPORT_SYMBOL(dev_queue_xmit
);
2888 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
2890 return __dev_queue_xmit(skb
, accel_priv
);
2892 EXPORT_SYMBOL(dev_queue_xmit_accel
);
2895 /*=======================================================================
2897 =======================================================================*/
2899 int netdev_max_backlog __read_mostly
= 1000;
2900 EXPORT_SYMBOL(netdev_max_backlog
);
2902 int netdev_tstamp_prequeue __read_mostly
= 1;
2903 int netdev_budget __read_mostly
= 300;
2904 int weight_p __read_mostly
= 64; /* old backlog weight */
2906 /* Called with irq disabled */
2907 static inline void ____napi_schedule(struct softnet_data
*sd
,
2908 struct napi_struct
*napi
)
2910 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2911 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2916 /* One global table that all flow-based protocols share. */
2917 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2918 EXPORT_SYMBOL(rps_sock_flow_table
);
2920 struct static_key rps_needed __read_mostly
;
2922 static struct rps_dev_flow
*
2923 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2924 struct rps_dev_flow
*rflow
, u16 next_cpu
)
2926 if (next_cpu
!= RPS_NO_CPU
) {
2927 #ifdef CONFIG_RFS_ACCEL
2928 struct netdev_rx_queue
*rxqueue
;
2929 struct rps_dev_flow_table
*flow_table
;
2930 struct rps_dev_flow
*old_rflow
;
2935 /* Should we steer this flow to a different hardware queue? */
2936 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
2937 !(dev
->features
& NETIF_F_NTUPLE
))
2939 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
2940 if (rxq_index
== skb_get_rx_queue(skb
))
2943 rxqueue
= dev
->_rx
+ rxq_index
;
2944 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2947 flow_id
= skb
->rxhash
& flow_table
->mask
;
2948 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
2949 rxq_index
, flow_id
);
2953 rflow
= &flow_table
->flows
[flow_id
];
2955 if (old_rflow
->filter
== rflow
->filter
)
2956 old_rflow
->filter
= RPS_NO_FILTER
;
2960 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
2963 rflow
->cpu
= next_cpu
;
2968 * get_rps_cpu is called from netif_receive_skb and returns the target
2969 * CPU from the RPS map of the receiving queue for a given skb.
2970 * rcu_read_lock must be held on entry.
2972 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2973 struct rps_dev_flow
**rflowp
)
2975 struct netdev_rx_queue
*rxqueue
;
2976 struct rps_map
*map
;
2977 struct rps_dev_flow_table
*flow_table
;
2978 struct rps_sock_flow_table
*sock_flow_table
;
2982 if (skb_rx_queue_recorded(skb
)) {
2983 u16 index
= skb_get_rx_queue(skb
);
2984 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
2985 WARN_ONCE(dev
->real_num_rx_queues
> 1,
2986 "%s received packet on queue %u, but number "
2987 "of RX queues is %u\n",
2988 dev
->name
, index
, dev
->real_num_rx_queues
);
2991 rxqueue
= dev
->_rx
+ index
;
2995 map
= rcu_dereference(rxqueue
->rps_map
);
2997 if (map
->len
== 1 &&
2998 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2999 tcpu
= map
->cpus
[0];
3000 if (cpu_online(tcpu
))
3004 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
3008 skb_reset_network_header(skb
);
3009 if (!skb_get_hash(skb
))
3012 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3013 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3014 if (flow_table
&& sock_flow_table
) {
3016 struct rps_dev_flow
*rflow
;
3018 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
3021 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
3022 sock_flow_table
->mask
];
3025 * If the desired CPU (where last recvmsg was done) is
3026 * different from current CPU (one in the rx-queue flow
3027 * table entry), switch if one of the following holds:
3028 * - Current CPU is unset (equal to RPS_NO_CPU).
3029 * - Current CPU is offline.
3030 * - The current CPU's queue tail has advanced beyond the
3031 * last packet that was enqueued using this table entry.
3032 * This guarantees that all previous packets for the flow
3033 * have been dequeued, thus preserving in order delivery.
3035 if (unlikely(tcpu
!= next_cpu
) &&
3036 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
3037 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3038 rflow
->last_qtail
)) >= 0)) {
3040 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3043 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
3051 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
3053 if (cpu_online(tcpu
)) {
3063 #ifdef CONFIG_RFS_ACCEL
3066 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3067 * @dev: Device on which the filter was set
3068 * @rxq_index: RX queue index
3069 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3070 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3072 * Drivers that implement ndo_rx_flow_steer() should periodically call
3073 * this function for each installed filter and remove the filters for
3074 * which it returns %true.
3076 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3077 u32 flow_id
, u16 filter_id
)
3079 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3080 struct rps_dev_flow_table
*flow_table
;
3081 struct rps_dev_flow
*rflow
;
3086 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3087 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3088 rflow
= &flow_table
->flows
[flow_id
];
3089 cpu
= ACCESS_ONCE(rflow
->cpu
);
3090 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
3091 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3092 rflow
->last_qtail
) <
3093 (int)(10 * flow_table
->mask
)))
3099 EXPORT_SYMBOL(rps_may_expire_flow
);
3101 #endif /* CONFIG_RFS_ACCEL */
3103 /* Called from hardirq (IPI) context */
3104 static void rps_trigger_softirq(void *data
)
3106 struct softnet_data
*sd
= data
;
3108 ____napi_schedule(sd
, &sd
->backlog
);
3112 #endif /* CONFIG_RPS */
3115 * Check if this softnet_data structure is another cpu one
3116 * If yes, queue it to our IPI list and return 1
3119 static int rps_ipi_queued(struct softnet_data
*sd
)
3122 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
3125 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3126 mysd
->rps_ipi_list
= sd
;
3128 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3131 #endif /* CONFIG_RPS */
3135 #ifdef CONFIG_NET_FLOW_LIMIT
3136 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3139 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3141 #ifdef CONFIG_NET_FLOW_LIMIT
3142 struct sd_flow_limit
*fl
;
3143 struct softnet_data
*sd
;
3144 unsigned int old_flow
, new_flow
;
3146 if (qlen
< (netdev_max_backlog
>> 1))
3149 sd
= &__get_cpu_var(softnet_data
);
3152 fl
= rcu_dereference(sd
->flow_limit
);
3154 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3155 old_flow
= fl
->history
[fl
->history_head
];
3156 fl
->history
[fl
->history_head
] = new_flow
;
3159 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3161 if (likely(fl
->buckets
[old_flow
]))
3162 fl
->buckets
[old_flow
]--;
3164 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3176 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3177 * queue (may be a remote CPU queue).
3179 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3180 unsigned int *qtail
)
3182 struct softnet_data
*sd
;
3183 unsigned long flags
;
3186 sd
= &per_cpu(softnet_data
, cpu
);
3188 local_irq_save(flags
);
3191 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3192 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3193 if (skb_queue_len(&sd
->input_pkt_queue
)) {
3195 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3196 input_queue_tail_incr_save(sd
, qtail
);
3198 local_irq_restore(flags
);
3199 return NET_RX_SUCCESS
;
3202 /* Schedule NAPI for backlog device
3203 * We can use non atomic operation since we own the queue lock
3205 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3206 if (!rps_ipi_queued(sd
))
3207 ____napi_schedule(sd
, &sd
->backlog
);
3215 local_irq_restore(flags
);
3217 atomic_long_inc(&skb
->dev
->rx_dropped
);
3223 * netif_rx - post buffer to the network code
3224 * @skb: buffer to post
3226 * This function receives a packet from a device driver and queues it for
3227 * the upper (protocol) levels to process. It always succeeds. The buffer
3228 * may be dropped during processing for congestion control or by the
3232 * NET_RX_SUCCESS (no congestion)
3233 * NET_RX_DROP (packet was dropped)
3237 int netif_rx(struct sk_buff
*skb
)
3241 /* if netpoll wants it, pretend we never saw it */
3242 if (netpoll_rx(skb
))
3245 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3247 trace_netif_rx(skb
);
3249 if (static_key_false(&rps_needed
)) {
3250 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3256 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3258 cpu
= smp_processor_id();
3260 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3268 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3273 EXPORT_SYMBOL(netif_rx
);
3275 int netif_rx_ni(struct sk_buff
*skb
)
3280 err
= netif_rx(skb
);
3281 if (local_softirq_pending())
3287 EXPORT_SYMBOL(netif_rx_ni
);
3289 static void net_tx_action(struct softirq_action
*h
)
3291 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3293 if (sd
->completion_queue
) {
3294 struct sk_buff
*clist
;
3296 local_irq_disable();
3297 clist
= sd
->completion_queue
;
3298 sd
->completion_queue
= NULL
;
3302 struct sk_buff
*skb
= clist
;
3303 clist
= clist
->next
;
3305 WARN_ON(atomic_read(&skb
->users
));
3306 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
3307 trace_consume_skb(skb
);
3309 trace_kfree_skb(skb
, net_tx_action
);
3314 if (sd
->output_queue
) {
3317 local_irq_disable();
3318 head
= sd
->output_queue
;
3319 sd
->output_queue
= NULL
;
3320 sd
->output_queue_tailp
= &sd
->output_queue
;
3324 struct Qdisc
*q
= head
;
3325 spinlock_t
*root_lock
;
3327 head
= head
->next_sched
;
3329 root_lock
= qdisc_lock(q
);
3330 if (spin_trylock(root_lock
)) {
3331 smp_mb__before_clear_bit();
3332 clear_bit(__QDISC_STATE_SCHED
,
3335 spin_unlock(root_lock
);
3337 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3339 __netif_reschedule(q
);
3341 smp_mb__before_clear_bit();
3342 clear_bit(__QDISC_STATE_SCHED
,
3350 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3351 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3352 /* This hook is defined here for ATM LANE */
3353 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3354 unsigned char *addr
) __read_mostly
;
3355 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3358 #ifdef CONFIG_NET_CLS_ACT
3359 /* TODO: Maybe we should just force sch_ingress to be compiled in
3360 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3361 * a compare and 2 stores extra right now if we dont have it on
3362 * but have CONFIG_NET_CLS_ACT
3363 * NOTE: This doesn't stop any functionality; if you dont have
3364 * the ingress scheduler, you just can't add policies on ingress.
3367 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3369 struct net_device
*dev
= skb
->dev
;
3370 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3371 int result
= TC_ACT_OK
;
3374 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3375 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3376 skb
->skb_iif
, dev
->ifindex
);
3380 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3381 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3384 if (q
!= &noop_qdisc
) {
3385 spin_lock(qdisc_lock(q
));
3386 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3387 result
= qdisc_enqueue_root(skb
, q
);
3388 spin_unlock(qdisc_lock(q
));
3394 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3395 struct packet_type
**pt_prev
,
3396 int *ret
, struct net_device
*orig_dev
)
3398 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3400 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3404 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3408 switch (ing_filter(skb
, rxq
)) {
3422 * netdev_rx_handler_register - register receive handler
3423 * @dev: device to register a handler for
3424 * @rx_handler: receive handler to register
3425 * @rx_handler_data: data pointer that is used by rx handler
3427 * Register a receive hander for a device. This handler will then be
3428 * called from __netif_receive_skb. A negative errno code is returned
3431 * The caller must hold the rtnl_mutex.
3433 * For a general description of rx_handler, see enum rx_handler_result.
3435 int netdev_rx_handler_register(struct net_device
*dev
,
3436 rx_handler_func_t
*rx_handler
,
3437 void *rx_handler_data
)
3441 if (dev
->rx_handler
)
3444 /* Note: rx_handler_data must be set before rx_handler */
3445 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3446 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3450 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3453 * netdev_rx_handler_unregister - unregister receive handler
3454 * @dev: device to unregister a handler from
3456 * Unregister a receive handler from a device.
3458 * The caller must hold the rtnl_mutex.
3460 void netdev_rx_handler_unregister(struct net_device
*dev
)
3464 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3465 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3466 * section has a guarantee to see a non NULL rx_handler_data
3470 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3472 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3475 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3476 * the special handling of PFMEMALLOC skbs.
3478 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3480 switch (skb
->protocol
) {
3481 case __constant_htons(ETH_P_ARP
):
3482 case __constant_htons(ETH_P_IP
):
3483 case __constant_htons(ETH_P_IPV6
):
3484 case __constant_htons(ETH_P_8021Q
):
3485 case __constant_htons(ETH_P_8021AD
):
3492 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3494 struct packet_type
*ptype
, *pt_prev
;
3495 rx_handler_func_t
*rx_handler
;
3496 struct net_device
*orig_dev
;
3497 struct net_device
*null_or_dev
;
3498 bool deliver_exact
= false;
3499 int ret
= NET_RX_DROP
;
3502 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3504 trace_netif_receive_skb(skb
);
3506 /* if we've gotten here through NAPI, check netpoll */
3507 if (netpoll_receive_skb(skb
))
3510 orig_dev
= skb
->dev
;
3512 skb_reset_network_header(skb
);
3513 if (!skb_transport_header_was_set(skb
))
3514 skb_reset_transport_header(skb
);
3515 skb_reset_mac_len(skb
);
3522 skb
->skb_iif
= skb
->dev
->ifindex
;
3524 __this_cpu_inc(softnet_data
.processed
);
3526 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
3527 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
3528 skb
= vlan_untag(skb
);
3533 #ifdef CONFIG_NET_CLS_ACT
3534 if (skb
->tc_verd
& TC_NCLS
) {
3535 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3543 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3544 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3546 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3552 #ifdef CONFIG_NET_CLS_ACT
3553 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3559 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3562 if (vlan_tx_tag_present(skb
)) {
3564 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3567 if (vlan_do_receive(&skb
))
3569 else if (unlikely(!skb
))
3573 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3576 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3579 switch (rx_handler(&skb
)) {
3580 case RX_HANDLER_CONSUMED
:
3581 ret
= NET_RX_SUCCESS
;
3583 case RX_HANDLER_ANOTHER
:
3585 case RX_HANDLER_EXACT
:
3586 deliver_exact
= true;
3587 case RX_HANDLER_PASS
:
3594 if (unlikely(vlan_tx_tag_present(skb
))) {
3595 if (vlan_tx_tag_get_id(skb
))
3596 skb
->pkt_type
= PACKET_OTHERHOST
;
3597 /* Note: we might in the future use prio bits
3598 * and set skb->priority like in vlan_do_receive()
3599 * For the time being, just ignore Priority Code Point
3604 /* deliver only exact match when indicated */
3605 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3607 type
= skb
->protocol
;
3608 list_for_each_entry_rcu(ptype
,
3609 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3610 if (ptype
->type
== type
&&
3611 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3612 ptype
->dev
== orig_dev
)) {
3614 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3620 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3623 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3626 atomic_long_inc(&skb
->dev
->rx_dropped
);
3628 /* Jamal, now you will not able to escape explaining
3629 * me how you were going to use this. :-)
3640 static int __netif_receive_skb(struct sk_buff
*skb
)
3644 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3645 unsigned long pflags
= current
->flags
;
3648 * PFMEMALLOC skbs are special, they should
3649 * - be delivered to SOCK_MEMALLOC sockets only
3650 * - stay away from userspace
3651 * - have bounded memory usage
3653 * Use PF_MEMALLOC as this saves us from propagating the allocation
3654 * context down to all allocation sites.
3656 current
->flags
|= PF_MEMALLOC
;
3657 ret
= __netif_receive_skb_core(skb
, true);
3658 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3660 ret
= __netif_receive_skb_core(skb
, false);
3666 * netif_receive_skb - process receive buffer from network
3667 * @skb: buffer to process
3669 * netif_receive_skb() is the main receive data processing function.
3670 * It always succeeds. The buffer may be dropped during processing
3671 * for congestion control or by the protocol layers.
3673 * This function may only be called from softirq context and interrupts
3674 * should be enabled.
3676 * Return values (usually ignored):
3677 * NET_RX_SUCCESS: no congestion
3678 * NET_RX_DROP: packet was dropped
3680 int netif_receive_skb(struct sk_buff
*skb
)
3682 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3684 if (skb_defer_rx_timestamp(skb
))
3685 return NET_RX_SUCCESS
;
3688 if (static_key_false(&rps_needed
)) {
3689 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3694 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3697 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3704 return __netif_receive_skb(skb
);
3706 EXPORT_SYMBOL(netif_receive_skb
);
3708 /* Network device is going away, flush any packets still pending
3709 * Called with irqs disabled.
3711 static void flush_backlog(void *arg
)
3713 struct net_device
*dev
= arg
;
3714 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3715 struct sk_buff
*skb
, *tmp
;
3718 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3719 if (skb
->dev
== dev
) {
3720 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3722 input_queue_head_incr(sd
);
3727 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3728 if (skb
->dev
== dev
) {
3729 __skb_unlink(skb
, &sd
->process_queue
);
3731 input_queue_head_incr(sd
);
3736 static int napi_gro_complete(struct sk_buff
*skb
)
3738 struct packet_offload
*ptype
;
3739 __be16 type
= skb
->protocol
;
3740 struct list_head
*head
= &offload_base
;
3743 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
3745 if (NAPI_GRO_CB(skb
)->count
== 1) {
3746 skb_shinfo(skb
)->gso_size
= 0;
3751 list_for_each_entry_rcu(ptype
, head
, list
) {
3752 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
3755 err
= ptype
->callbacks
.gro_complete(skb
, 0);
3761 WARN_ON(&ptype
->list
== head
);
3763 return NET_RX_SUCCESS
;
3767 return netif_receive_skb(skb
);
3770 /* napi->gro_list contains packets ordered by age.
3771 * youngest packets at the head of it.
3772 * Complete skbs in reverse order to reduce latencies.
3774 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
3776 struct sk_buff
*skb
, *prev
= NULL
;
3778 /* scan list and build reverse chain */
3779 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
3784 for (skb
= prev
; skb
; skb
= prev
) {
3787 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
3791 napi_gro_complete(skb
);
3795 napi
->gro_list
= NULL
;
3797 EXPORT_SYMBOL(napi_gro_flush
);
3799 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
3802 unsigned int maclen
= skb
->dev
->hard_header_len
;
3804 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3805 unsigned long diffs
;
3807 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3808 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3809 if (maclen
== ETH_HLEN
)
3810 diffs
|= compare_ether_header(skb_mac_header(p
),
3811 skb_gro_mac_header(skb
));
3813 diffs
= memcmp(skb_mac_header(p
),
3814 skb_gro_mac_header(skb
),
3816 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3817 NAPI_GRO_CB(p
)->flush
= 0;
3821 static void skb_gro_reset_offset(struct sk_buff
*skb
)
3823 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3824 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
3826 NAPI_GRO_CB(skb
)->data_offset
= 0;
3827 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3828 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3830 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
3832 !PageHighMem(skb_frag_page(frag0
))) {
3833 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
3834 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
3838 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3840 struct sk_buff
**pp
= NULL
;
3841 struct packet_offload
*ptype
;
3842 __be16 type
= skb
->protocol
;
3843 struct list_head
*head
= &offload_base
;
3845 enum gro_result ret
;
3847 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3850 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3853 skb_gro_reset_offset(skb
);
3854 gro_list_prepare(napi
, skb
);
3855 NAPI_GRO_CB(skb
)->csum
= skb
->csum
; /* Needed for CHECKSUM_COMPLETE */
3858 list_for_each_entry_rcu(ptype
, head
, list
) {
3859 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
3862 skb_set_network_header(skb
, skb_gro_offset(skb
));
3863 skb_reset_mac_len(skb
);
3864 NAPI_GRO_CB(skb
)->same_flow
= 0;
3865 NAPI_GRO_CB(skb
)->flush
= 0;
3866 NAPI_GRO_CB(skb
)->free
= 0;
3868 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
3873 if (&ptype
->list
== head
)
3876 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3877 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3880 struct sk_buff
*nskb
= *pp
;
3884 napi_gro_complete(nskb
);
3891 if (NAPI_GRO_CB(skb
)->flush
)
3894 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
3895 struct sk_buff
*nskb
= napi
->gro_list
;
3897 /* locate the end of the list to select the 'oldest' flow */
3898 while (nskb
->next
) {
3904 napi_gro_complete(nskb
);
3908 NAPI_GRO_CB(skb
)->count
= 1;
3909 NAPI_GRO_CB(skb
)->age
= jiffies
;
3910 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3911 skb
->next
= napi
->gro_list
;
3912 napi
->gro_list
= skb
;
3916 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3917 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3919 BUG_ON(skb
->end
- skb
->tail
< grow
);
3921 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3924 skb
->data_len
-= grow
;
3926 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3927 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3929 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3930 skb_frag_unref(skb
, 0);
3931 memmove(skb_shinfo(skb
)->frags
,
3932 skb_shinfo(skb
)->frags
+ 1,
3933 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3945 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
3947 struct list_head
*offload_head
= &offload_base
;
3948 struct packet_offload
*ptype
;
3950 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
3951 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
3958 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
3960 struct list_head
*offload_head
= &offload_base
;
3961 struct packet_offload
*ptype
;
3963 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
3964 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
3971 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3975 if (netif_receive_skb(skb
))
3983 case GRO_MERGED_FREE
:
3984 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3985 kmem_cache_free(skbuff_head_cache
, skb
);
3998 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4000 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4002 EXPORT_SYMBOL(napi_gro_receive
);
4004 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4006 __skb_pull(skb
, skb_headlen(skb
));
4007 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4008 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
4010 skb
->dev
= napi
->dev
;
4016 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
4018 struct sk_buff
*skb
= napi
->skb
;
4021 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
4026 EXPORT_SYMBOL(napi_get_frags
);
4028 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
4033 if (netif_receive_skb(skb
))
4038 case GRO_MERGED_FREE
:
4039 napi_reuse_skb(napi
, skb
);
4050 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4052 struct sk_buff
*skb
= napi
->skb
;
4056 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
)))) {
4057 napi_reuse_skb(napi
, skb
);
4060 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4065 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4067 struct sk_buff
*skb
= napi_frags_skb(napi
);
4072 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4074 EXPORT_SYMBOL(napi_gro_frags
);
4077 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4078 * Note: called with local irq disabled, but exits with local irq enabled.
4080 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4083 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4086 sd
->rps_ipi_list
= NULL
;
4090 /* Send pending IPI's to kick RPS processing on remote cpus. */
4092 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4094 if (cpu_online(remsd
->cpu
))
4095 __smp_call_function_single(remsd
->cpu
,
4104 static int process_backlog(struct napi_struct
*napi
, int quota
)
4107 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4110 /* Check if we have pending ipi, its better to send them now,
4111 * not waiting net_rx_action() end.
4113 if (sd
->rps_ipi_list
) {
4114 local_irq_disable();
4115 net_rps_action_and_irq_enable(sd
);
4118 napi
->weight
= weight_p
;
4119 local_irq_disable();
4120 while (work
< quota
) {
4121 struct sk_buff
*skb
;
4124 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4126 __netif_receive_skb(skb
);
4127 local_irq_disable();
4128 input_queue_head_incr(sd
);
4129 if (++work
>= quota
) {
4136 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
4138 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4139 &sd
->process_queue
);
4141 if (qlen
< quota
- work
) {
4143 * Inline a custom version of __napi_complete().
4144 * only current cpu owns and manipulates this napi,
4145 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
4146 * we can use a plain write instead of clear_bit(),
4147 * and we dont need an smp_mb() memory barrier.
4149 list_del(&napi
->poll_list
);
4152 quota
= work
+ qlen
;
4162 * __napi_schedule - schedule for receive
4163 * @n: entry to schedule
4165 * The entry's receive function will be scheduled to run
4167 void __napi_schedule(struct napi_struct
*n
)
4169 unsigned long flags
;
4171 local_irq_save(flags
);
4172 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
4173 local_irq_restore(flags
);
4175 EXPORT_SYMBOL(__napi_schedule
);
4177 void __napi_complete(struct napi_struct
*n
)
4179 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4180 BUG_ON(n
->gro_list
);
4182 list_del(&n
->poll_list
);
4183 smp_mb__before_clear_bit();
4184 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4186 EXPORT_SYMBOL(__napi_complete
);
4188 void napi_complete(struct napi_struct
*n
)
4190 unsigned long flags
;
4193 * don't let napi dequeue from the cpu poll list
4194 * just in case its running on a different cpu
4196 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4199 napi_gro_flush(n
, false);
4200 local_irq_save(flags
);
4202 local_irq_restore(flags
);
4204 EXPORT_SYMBOL(napi_complete
);
4206 /* must be called under rcu_read_lock(), as we dont take a reference */
4207 struct napi_struct
*napi_by_id(unsigned int napi_id
)
4209 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4210 struct napi_struct
*napi
;
4212 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4213 if (napi
->napi_id
== napi_id
)
4218 EXPORT_SYMBOL_GPL(napi_by_id
);
4220 void napi_hash_add(struct napi_struct
*napi
)
4222 if (!test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
4224 spin_lock(&napi_hash_lock
);
4226 /* 0 is not a valid id, we also skip an id that is taken
4227 * we expect both events to be extremely rare
4230 while (!napi
->napi_id
) {
4231 napi
->napi_id
= ++napi_gen_id
;
4232 if (napi_by_id(napi
->napi_id
))
4236 hlist_add_head_rcu(&napi
->napi_hash_node
,
4237 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
4239 spin_unlock(&napi_hash_lock
);
4242 EXPORT_SYMBOL_GPL(napi_hash_add
);
4244 /* Warning : caller is responsible to make sure rcu grace period
4245 * is respected before freeing memory containing @napi
4247 void napi_hash_del(struct napi_struct
*napi
)
4249 spin_lock(&napi_hash_lock
);
4251 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
))
4252 hlist_del_rcu(&napi
->napi_hash_node
);
4254 spin_unlock(&napi_hash_lock
);
4256 EXPORT_SYMBOL_GPL(napi_hash_del
);
4258 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4259 int (*poll
)(struct napi_struct
*, int), int weight
)
4261 INIT_LIST_HEAD(&napi
->poll_list
);
4262 napi
->gro_count
= 0;
4263 napi
->gro_list
= NULL
;
4266 if (weight
> NAPI_POLL_WEIGHT
)
4267 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4269 napi
->weight
= weight
;
4270 list_add(&napi
->dev_list
, &dev
->napi_list
);
4272 #ifdef CONFIG_NETPOLL
4273 spin_lock_init(&napi
->poll_lock
);
4274 napi
->poll_owner
= -1;
4276 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4278 EXPORT_SYMBOL(netif_napi_add
);
4280 void netif_napi_del(struct napi_struct
*napi
)
4282 list_del_init(&napi
->dev_list
);
4283 napi_free_frags(napi
);
4285 kfree_skb_list(napi
->gro_list
);
4286 napi
->gro_list
= NULL
;
4287 napi
->gro_count
= 0;
4289 EXPORT_SYMBOL(netif_napi_del
);
4291 static void net_rx_action(struct softirq_action
*h
)
4293 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
4294 unsigned long time_limit
= jiffies
+ 2;
4295 int budget
= netdev_budget
;
4298 local_irq_disable();
4300 while (!list_empty(&sd
->poll_list
)) {
4301 struct napi_struct
*n
;
4304 /* If softirq window is exhuasted then punt.
4305 * Allow this to run for 2 jiffies since which will allow
4306 * an average latency of 1.5/HZ.
4308 if (unlikely(budget
<= 0 || time_after_eq(jiffies
, time_limit
)))
4313 /* Even though interrupts have been re-enabled, this
4314 * access is safe because interrupts can only add new
4315 * entries to the tail of this list, and only ->poll()
4316 * calls can remove this head entry from the list.
4318 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
4320 have
= netpoll_poll_lock(n
);
4324 /* This NAPI_STATE_SCHED test is for avoiding a race
4325 * with netpoll's poll_napi(). Only the entity which
4326 * obtains the lock and sees NAPI_STATE_SCHED set will
4327 * actually make the ->poll() call. Therefore we avoid
4328 * accidentally calling ->poll() when NAPI is not scheduled.
4331 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4332 work
= n
->poll(n
, weight
);
4336 WARN_ON_ONCE(work
> weight
);
4340 local_irq_disable();
4342 /* Drivers must not modify the NAPI state if they
4343 * consume the entire weight. In such cases this code
4344 * still "owns" the NAPI instance and therefore can
4345 * move the instance around on the list at-will.
4347 if (unlikely(work
== weight
)) {
4348 if (unlikely(napi_disable_pending(n
))) {
4351 local_irq_disable();
4354 /* flush too old packets
4355 * If HZ < 1000, flush all packets.
4358 napi_gro_flush(n
, HZ
>= 1000);
4359 local_irq_disable();
4361 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
4365 netpoll_poll_unlock(have
);
4368 net_rps_action_and_irq_enable(sd
);
4370 #ifdef CONFIG_NET_DMA
4372 * There may not be any more sk_buffs coming right now, so push
4373 * any pending DMA copies to hardware
4375 dma_issue_pending_all();
4382 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4386 struct netdev_adjacent
{
4387 struct net_device
*dev
;
4389 /* upper master flag, there can only be one master device per list */
4392 /* counter for the number of times this device was added to us */
4395 /* private field for the users */
4398 struct list_head list
;
4399 struct rcu_head rcu
;
4402 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*dev
,
4403 struct net_device
*adj_dev
,
4404 struct list_head
*adj_list
)
4406 struct netdev_adjacent
*adj
;
4408 list_for_each_entry(adj
, adj_list
, list
) {
4409 if (adj
->dev
== adj_dev
)
4416 * netdev_has_upper_dev - Check if device is linked to an upper device
4418 * @upper_dev: upper device to check
4420 * Find out if a device is linked to specified upper device and return true
4421 * in case it is. Note that this checks only immediate upper device,
4422 * not through a complete stack of devices. The caller must hold the RTNL lock.
4424 bool netdev_has_upper_dev(struct net_device
*dev
,
4425 struct net_device
*upper_dev
)
4429 return __netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
);
4431 EXPORT_SYMBOL(netdev_has_upper_dev
);
4434 * netdev_has_any_upper_dev - Check if device is linked to some device
4437 * Find out if a device is linked to an upper device and return true in case
4438 * it is. The caller must hold the RTNL lock.
4440 static bool netdev_has_any_upper_dev(struct net_device
*dev
)
4444 return !list_empty(&dev
->all_adj_list
.upper
);
4448 * netdev_master_upper_dev_get - Get master upper device
4451 * Find a master upper device and return pointer to it or NULL in case
4452 * it's not there. The caller must hold the RTNL lock.
4454 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4456 struct netdev_adjacent
*upper
;
4460 if (list_empty(&dev
->adj_list
.upper
))
4463 upper
= list_first_entry(&dev
->adj_list
.upper
,
4464 struct netdev_adjacent
, list
);
4465 if (likely(upper
->master
))
4469 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4471 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
4473 struct netdev_adjacent
*adj
;
4475 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
4477 return adj
->private;
4479 EXPORT_SYMBOL(netdev_adjacent_get_private
);
4482 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4484 * @iter: list_head ** of the current position
4486 * Gets the next device from the dev's upper list, starting from iter
4487 * position. The caller must hold RCU read lock.
4489 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
4490 struct list_head
**iter
)
4492 struct netdev_adjacent
*upper
;
4494 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4496 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4498 if (&upper
->list
== &dev
->all_adj_list
.upper
)
4501 *iter
= &upper
->list
;
4505 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
4508 * netdev_lower_get_next_private - Get the next ->private from the
4509 * lower neighbour list
4511 * @iter: list_head ** of the current position
4513 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4514 * list, starting from iter position. The caller must hold either hold the
4515 * RTNL lock or its own locking that guarantees that the neighbour lower
4516 * list will remain unchainged.
4518 void *netdev_lower_get_next_private(struct net_device
*dev
,
4519 struct list_head
**iter
)
4521 struct netdev_adjacent
*lower
;
4523 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
4525 if (&lower
->list
== &dev
->adj_list
.lower
)
4529 *iter
= lower
->list
.next
;
4531 return lower
->private;
4533 EXPORT_SYMBOL(netdev_lower_get_next_private
);
4536 * netdev_lower_get_next_private_rcu - Get the next ->private from the
4537 * lower neighbour list, RCU
4540 * @iter: list_head ** of the current position
4542 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4543 * list, starting from iter position. The caller must hold RCU read lock.
4545 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
4546 struct list_head
**iter
)
4548 struct netdev_adjacent
*lower
;
4550 WARN_ON_ONCE(!rcu_read_lock_held());
4552 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4554 if (&lower
->list
== &dev
->adj_list
.lower
)
4558 *iter
= &lower
->list
;
4560 return lower
->private;
4562 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
4565 * netdev_lower_get_first_private_rcu - Get the first ->private from the
4566 * lower neighbour list, RCU
4570 * Gets the first netdev_adjacent->private from the dev's lower neighbour
4571 * list. The caller must hold RCU read lock.
4573 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
4575 struct netdev_adjacent
*lower
;
4577 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
4578 struct netdev_adjacent
, list
);
4580 return lower
->private;
4583 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
4586 * netdev_master_upper_dev_get_rcu - Get master upper device
4589 * Find a master upper device and return pointer to it or NULL in case
4590 * it's not there. The caller must hold the RCU read lock.
4592 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
4594 struct netdev_adjacent
*upper
;
4596 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
4597 struct netdev_adjacent
, list
);
4598 if (upper
&& likely(upper
->master
))
4602 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
4604 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
4605 struct net_device
*adj_dev
,
4606 struct list_head
*dev_list
,
4607 void *private, bool master
)
4609 struct netdev_adjacent
*adj
;
4610 char linkname
[IFNAMSIZ
+7];
4613 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
4620 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
4625 adj
->master
= master
;
4627 adj
->private = private;
4630 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
4631 adj_dev
->name
, dev
->name
, adj_dev
->name
);
4633 if (dev_list
== &dev
->adj_list
.lower
) {
4634 sprintf(linkname
, "lower_%s", adj_dev
->name
);
4635 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
4636 &(adj_dev
->dev
.kobj
), linkname
);
4639 } else if (dev_list
== &dev
->adj_list
.upper
) {
4640 sprintf(linkname
, "upper_%s", adj_dev
->name
);
4641 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
4642 &(adj_dev
->dev
.kobj
), linkname
);
4647 /* Ensure that master link is always the first item in list. */
4649 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
4650 &(adj_dev
->dev
.kobj
), "master");
4652 goto remove_symlinks
;
4654 list_add_rcu(&adj
->list
, dev_list
);
4656 list_add_tail_rcu(&adj
->list
, dev_list
);
4662 if (dev_list
== &dev
->adj_list
.lower
) {
4663 sprintf(linkname
, "lower_%s", adj_dev
->name
);
4664 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4665 } else if (dev_list
== &dev
->adj_list
.upper
) {
4666 sprintf(linkname
, "upper_%s", adj_dev
->name
);
4667 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4677 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
4678 struct net_device
*adj_dev
,
4679 struct list_head
*dev_list
)
4681 struct netdev_adjacent
*adj
;
4682 char linkname
[IFNAMSIZ
+7];
4684 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
4687 pr_err("tried to remove device %s from %s\n",
4688 dev
->name
, adj_dev
->name
);
4692 if (adj
->ref_nr
> 1) {
4693 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
4700 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
4702 if (dev_list
== &dev
->adj_list
.lower
) {
4703 sprintf(linkname
, "lower_%s", adj_dev
->name
);
4704 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4705 } else if (dev_list
== &dev
->adj_list
.upper
) {
4706 sprintf(linkname
, "upper_%s", adj_dev
->name
);
4707 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4710 list_del_rcu(&adj
->list
);
4711 pr_debug("dev_put for %s, because link removed from %s to %s\n",
4712 adj_dev
->name
, dev
->name
, adj_dev
->name
);
4714 kfree_rcu(adj
, rcu
);
4717 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
4718 struct net_device
*upper_dev
,
4719 struct list_head
*up_list
,
4720 struct list_head
*down_list
,
4721 void *private, bool master
)
4725 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
4730 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
4733 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
4740 static int __netdev_adjacent_dev_link(struct net_device
*dev
,
4741 struct net_device
*upper_dev
)
4743 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
4744 &dev
->all_adj_list
.upper
,
4745 &upper_dev
->all_adj_list
.lower
,
4749 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
4750 struct net_device
*upper_dev
,
4751 struct list_head
*up_list
,
4752 struct list_head
*down_list
)
4754 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
4755 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
4758 static void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
4759 struct net_device
*upper_dev
)
4761 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
4762 &dev
->all_adj_list
.upper
,
4763 &upper_dev
->all_adj_list
.lower
);
4766 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
4767 struct net_device
*upper_dev
,
4768 void *private, bool master
)
4770 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
4775 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
4776 &dev
->adj_list
.upper
,
4777 &upper_dev
->adj_list
.lower
,
4780 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
4787 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
4788 struct net_device
*upper_dev
)
4790 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
4791 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
4792 &dev
->adj_list
.upper
,
4793 &upper_dev
->adj_list
.lower
);
4796 static int __netdev_upper_dev_link(struct net_device
*dev
,
4797 struct net_device
*upper_dev
, bool master
,
4800 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
4805 if (dev
== upper_dev
)
4808 /* To prevent loops, check if dev is not upper device to upper_dev. */
4809 if (__netdev_find_adj(upper_dev
, dev
, &upper_dev
->all_adj_list
.upper
))
4812 if (__netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
))
4815 if (master
&& netdev_master_upper_dev_get(dev
))
4818 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, private,
4823 /* Now that we linked these devs, make all the upper_dev's
4824 * all_adj_list.upper visible to every dev's all_adj_list.lower an
4825 * versa, and don't forget the devices itself. All of these
4826 * links are non-neighbours.
4828 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
4829 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
4830 pr_debug("Interlinking %s with %s, non-neighbour\n",
4831 i
->dev
->name
, j
->dev
->name
);
4832 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
4838 /* add dev to every upper_dev's upper device */
4839 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
4840 pr_debug("linking %s's upper device %s with %s\n",
4841 upper_dev
->name
, i
->dev
->name
, dev
->name
);
4842 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
4844 goto rollback_upper_mesh
;
4847 /* add upper_dev to every dev's lower device */
4848 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
4849 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
4850 i
->dev
->name
, upper_dev
->name
);
4851 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
4853 goto rollback_lower_mesh
;
4856 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
4859 rollback_lower_mesh
:
4861 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
4864 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
4869 rollback_upper_mesh
:
4871 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
4874 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
4882 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
4883 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
4884 if (i
== to_i
&& j
== to_j
)
4886 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
4892 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
4898 * netdev_upper_dev_link - Add a link to the upper device
4900 * @upper_dev: new upper device
4902 * Adds a link to device which is upper to this one. The caller must hold
4903 * the RTNL lock. On a failure a negative errno code is returned.
4904 * On success the reference counts are adjusted and the function
4907 int netdev_upper_dev_link(struct net_device
*dev
,
4908 struct net_device
*upper_dev
)
4910 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
);
4912 EXPORT_SYMBOL(netdev_upper_dev_link
);
4915 * netdev_master_upper_dev_link - Add a master link to the upper device
4917 * @upper_dev: new upper device
4919 * Adds a link to device which is upper to this one. In this case, only
4920 * one master upper device can be linked, although other non-master devices
4921 * might be linked as well. The caller must hold the RTNL lock.
4922 * On a failure a negative errno code is returned. On success the reference
4923 * counts are adjusted and the function returns zero.
4925 int netdev_master_upper_dev_link(struct net_device
*dev
,
4926 struct net_device
*upper_dev
)
4928 return __netdev_upper_dev_link(dev
, upper_dev
, true, NULL
);
4930 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
4932 int netdev_master_upper_dev_link_private(struct net_device
*dev
,
4933 struct net_device
*upper_dev
,
4936 return __netdev_upper_dev_link(dev
, upper_dev
, true, private);
4938 EXPORT_SYMBOL(netdev_master_upper_dev_link_private
);
4941 * netdev_upper_dev_unlink - Removes a link to upper device
4943 * @upper_dev: new upper device
4945 * Removes a link to device which is upper to this one. The caller must hold
4948 void netdev_upper_dev_unlink(struct net_device
*dev
,
4949 struct net_device
*upper_dev
)
4951 struct netdev_adjacent
*i
, *j
;
4954 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
4956 /* Here is the tricky part. We must remove all dev's lower
4957 * devices from all upper_dev's upper devices and vice
4958 * versa, to maintain the graph relationship.
4960 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
4961 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
4962 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
4964 /* remove also the devices itself from lower/upper device
4967 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
4968 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
4970 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
4971 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
4973 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
4975 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
4977 void *netdev_lower_dev_get_private(struct net_device
*dev
,
4978 struct net_device
*lower_dev
)
4980 struct netdev_adjacent
*lower
;
4984 lower
= __netdev_find_adj(dev
, lower_dev
, &dev
->adj_list
.lower
);
4988 return lower
->private;
4990 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
4992 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4994 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4996 if (ops
->ndo_change_rx_flags
)
4997 ops
->ndo_change_rx_flags(dev
, flags
);
5000 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
5002 unsigned int old_flags
= dev
->flags
;
5008 dev
->flags
|= IFF_PROMISC
;
5009 dev
->promiscuity
+= inc
;
5010 if (dev
->promiscuity
== 0) {
5013 * If inc causes overflow, untouch promisc and return error.
5016 dev
->flags
&= ~IFF_PROMISC
;
5018 dev
->promiscuity
-= inc
;
5019 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5024 if (dev
->flags
!= old_flags
) {
5025 pr_info("device %s %s promiscuous mode\n",
5027 dev
->flags
& IFF_PROMISC
? "entered" : "left");
5028 if (audit_enabled
) {
5029 current_uid_gid(&uid
, &gid
);
5030 audit_log(current
->audit_context
, GFP_ATOMIC
,
5031 AUDIT_ANOM_PROMISCUOUS
,
5032 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5033 dev
->name
, (dev
->flags
& IFF_PROMISC
),
5034 (old_flags
& IFF_PROMISC
),
5035 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
5036 from_kuid(&init_user_ns
, uid
),
5037 from_kgid(&init_user_ns
, gid
),
5038 audit_get_sessionid(current
));
5041 dev_change_rx_flags(dev
, IFF_PROMISC
);
5044 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
5049 * dev_set_promiscuity - update promiscuity count on a device
5053 * Add or remove promiscuity from a device. While the count in the device
5054 * remains above zero the interface remains promiscuous. Once it hits zero
5055 * the device reverts back to normal filtering operation. A negative inc
5056 * value is used to drop promiscuity on the device.
5057 * Return 0 if successful or a negative errno code on error.
5059 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
5061 unsigned int old_flags
= dev
->flags
;
5064 err
= __dev_set_promiscuity(dev
, inc
, true);
5067 if (dev
->flags
!= old_flags
)
5068 dev_set_rx_mode(dev
);
5071 EXPORT_SYMBOL(dev_set_promiscuity
);
5073 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
5075 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5079 dev
->flags
|= IFF_ALLMULTI
;
5080 dev
->allmulti
+= inc
;
5081 if (dev
->allmulti
== 0) {
5084 * If inc causes overflow, untouch allmulti and return error.
5087 dev
->flags
&= ~IFF_ALLMULTI
;
5089 dev
->allmulti
-= inc
;
5090 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5095 if (dev
->flags
^ old_flags
) {
5096 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
5097 dev_set_rx_mode(dev
);
5099 __dev_notify_flags(dev
, old_flags
,
5100 dev
->gflags
^ old_gflags
);
5106 * dev_set_allmulti - update allmulti count on a device
5110 * Add or remove reception of all multicast frames to a device. While the
5111 * count in the device remains above zero the interface remains listening
5112 * to all interfaces. Once it hits zero the device reverts back to normal
5113 * filtering operation. A negative @inc value is used to drop the counter
5114 * when releasing a resource needing all multicasts.
5115 * Return 0 if successful or a negative errno code on error.
5118 int dev_set_allmulti(struct net_device
*dev
, int inc
)
5120 return __dev_set_allmulti(dev
, inc
, true);
5122 EXPORT_SYMBOL(dev_set_allmulti
);
5125 * Upload unicast and multicast address lists to device and
5126 * configure RX filtering. When the device doesn't support unicast
5127 * filtering it is put in promiscuous mode while unicast addresses
5130 void __dev_set_rx_mode(struct net_device
*dev
)
5132 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5134 /* dev_open will call this function so the list will stay sane. */
5135 if (!(dev
->flags
&IFF_UP
))
5138 if (!netif_device_present(dev
))
5141 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
5142 /* Unicast addresses changes may only happen under the rtnl,
5143 * therefore calling __dev_set_promiscuity here is safe.
5145 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
5146 __dev_set_promiscuity(dev
, 1, false);
5147 dev
->uc_promisc
= true;
5148 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
5149 __dev_set_promiscuity(dev
, -1, false);
5150 dev
->uc_promisc
= false;
5154 if (ops
->ndo_set_rx_mode
)
5155 ops
->ndo_set_rx_mode(dev
);
5158 void dev_set_rx_mode(struct net_device
*dev
)
5160 netif_addr_lock_bh(dev
);
5161 __dev_set_rx_mode(dev
);
5162 netif_addr_unlock_bh(dev
);
5166 * dev_get_flags - get flags reported to userspace
5169 * Get the combination of flag bits exported through APIs to userspace.
5171 unsigned int dev_get_flags(const struct net_device
*dev
)
5175 flags
= (dev
->flags
& ~(IFF_PROMISC
|
5180 (dev
->gflags
& (IFF_PROMISC
|
5183 if (netif_running(dev
)) {
5184 if (netif_oper_up(dev
))
5185 flags
|= IFF_RUNNING
;
5186 if (netif_carrier_ok(dev
))
5187 flags
|= IFF_LOWER_UP
;
5188 if (netif_dormant(dev
))
5189 flags
|= IFF_DORMANT
;
5194 EXPORT_SYMBOL(dev_get_flags
);
5196 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5198 unsigned int old_flags
= dev
->flags
;
5204 * Set the flags on our device.
5207 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
5208 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
5210 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
5214 * Load in the correct multicast list now the flags have changed.
5217 if ((old_flags
^ flags
) & IFF_MULTICAST
)
5218 dev_change_rx_flags(dev
, IFF_MULTICAST
);
5220 dev_set_rx_mode(dev
);
5223 * Have we downed the interface. We handle IFF_UP ourselves
5224 * according to user attempts to set it, rather than blindly
5229 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
5230 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
5233 dev_set_rx_mode(dev
);
5236 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
5237 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
5238 unsigned int old_flags
= dev
->flags
;
5240 dev
->gflags
^= IFF_PROMISC
;
5242 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
5243 if (dev
->flags
!= old_flags
)
5244 dev_set_rx_mode(dev
);
5247 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5248 is important. Some (broken) drivers set IFF_PROMISC, when
5249 IFF_ALLMULTI is requested not asking us and not reporting.
5251 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
5252 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
5254 dev
->gflags
^= IFF_ALLMULTI
;
5255 __dev_set_allmulti(dev
, inc
, false);
5261 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
5262 unsigned int gchanges
)
5264 unsigned int changes
= dev
->flags
^ old_flags
;
5267 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
5269 if (changes
& IFF_UP
) {
5270 if (dev
->flags
& IFF_UP
)
5271 call_netdevice_notifiers(NETDEV_UP
, dev
);
5273 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
5276 if (dev
->flags
& IFF_UP
&&
5277 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
5278 struct netdev_notifier_change_info change_info
;
5280 change_info
.flags_changed
= changes
;
5281 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
5287 * dev_change_flags - change device settings
5289 * @flags: device state flags
5291 * Change settings on device based state flags. The flags are
5292 * in the userspace exported format.
5294 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5297 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5299 ret
= __dev_change_flags(dev
, flags
);
5303 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
5304 __dev_notify_flags(dev
, old_flags
, changes
);
5307 EXPORT_SYMBOL(dev_change_flags
);
5309 static int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5311 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5313 if (ops
->ndo_change_mtu
)
5314 return ops
->ndo_change_mtu(dev
, new_mtu
);
5321 * dev_set_mtu - Change maximum transfer unit
5323 * @new_mtu: new transfer unit
5325 * Change the maximum transfer size of the network device.
5327 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5331 if (new_mtu
== dev
->mtu
)
5334 /* MTU must be positive. */
5338 if (!netif_device_present(dev
))
5341 orig_mtu
= dev
->mtu
;
5342 err
= __dev_set_mtu(dev
, new_mtu
);
5345 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5346 err
= notifier_to_errno(err
);
5348 /* setting mtu back and notifying everyone again,
5349 * so that they have a chance to revert changes.
5351 __dev_set_mtu(dev
, orig_mtu
);
5352 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5357 EXPORT_SYMBOL(dev_set_mtu
);
5360 * dev_set_group - Change group this device belongs to
5362 * @new_group: group this device should belong to
5364 void dev_set_group(struct net_device
*dev
, int new_group
)
5366 dev
->group
= new_group
;
5368 EXPORT_SYMBOL(dev_set_group
);
5371 * dev_set_mac_address - Change Media Access Control Address
5375 * Change the hardware (MAC) address of the device
5377 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
5379 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5382 if (!ops
->ndo_set_mac_address
)
5384 if (sa
->sa_family
!= dev
->type
)
5386 if (!netif_device_present(dev
))
5388 err
= ops
->ndo_set_mac_address(dev
, sa
);
5391 dev
->addr_assign_type
= NET_ADDR_SET
;
5392 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
5393 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5396 EXPORT_SYMBOL(dev_set_mac_address
);
5399 * dev_change_carrier - Change device carrier
5401 * @new_carrier: new value
5403 * Change device carrier
5405 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
5407 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5409 if (!ops
->ndo_change_carrier
)
5411 if (!netif_device_present(dev
))
5413 return ops
->ndo_change_carrier(dev
, new_carrier
);
5415 EXPORT_SYMBOL(dev_change_carrier
);
5418 * dev_get_phys_port_id - Get device physical port ID
5422 * Get device physical port ID
5424 int dev_get_phys_port_id(struct net_device
*dev
,
5425 struct netdev_phys_port_id
*ppid
)
5427 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5429 if (!ops
->ndo_get_phys_port_id
)
5431 return ops
->ndo_get_phys_port_id(dev
, ppid
);
5433 EXPORT_SYMBOL(dev_get_phys_port_id
);
5436 * dev_new_index - allocate an ifindex
5437 * @net: the applicable net namespace
5439 * Returns a suitable unique value for a new device interface
5440 * number. The caller must hold the rtnl semaphore or the
5441 * dev_base_lock to be sure it remains unique.
5443 static int dev_new_index(struct net
*net
)
5445 int ifindex
= net
->ifindex
;
5449 if (!__dev_get_by_index(net
, ifindex
))
5450 return net
->ifindex
= ifindex
;
5454 /* Delayed registration/unregisteration */
5455 static LIST_HEAD(net_todo_list
);
5456 static DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
5458 static void net_set_todo(struct net_device
*dev
)
5460 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5461 dev_net(dev
)->dev_unreg_count
++;
5464 static void rollback_registered_many(struct list_head
*head
)
5466 struct net_device
*dev
, *tmp
;
5467 LIST_HEAD(close_head
);
5469 BUG_ON(dev_boot_phase
);
5472 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5473 /* Some devices call without registering
5474 * for initialization unwind. Remove those
5475 * devices and proceed with the remaining.
5477 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5478 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5482 list_del(&dev
->unreg_list
);
5485 dev
->dismantle
= true;
5486 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
5489 /* If device is running, close it first. */
5490 list_for_each_entry(dev
, head
, unreg_list
)
5491 list_add_tail(&dev
->close_list
, &close_head
);
5492 dev_close_many(&close_head
);
5494 list_for_each_entry(dev
, head
, unreg_list
) {
5495 /* And unlink it from device chain. */
5496 unlist_netdevice(dev
);
5498 dev
->reg_state
= NETREG_UNREGISTERING
;
5503 list_for_each_entry(dev
, head
, unreg_list
) {
5504 /* Shutdown queueing discipline. */
5508 /* Notify protocols, that we are about to destroy
5509 this device. They should clean all the things.
5511 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5513 if (!dev
->rtnl_link_ops
||
5514 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5515 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
5518 * Flush the unicast and multicast chains
5523 if (dev
->netdev_ops
->ndo_uninit
)
5524 dev
->netdev_ops
->ndo_uninit(dev
);
5526 /* Notifier chain MUST detach us all upper devices. */
5527 WARN_ON(netdev_has_any_upper_dev(dev
));
5529 /* Remove entries from kobject tree */
5530 netdev_unregister_kobject(dev
);
5532 /* Remove XPS queueing entries */
5533 netif_reset_xps_queues_gt(dev
, 0);
5539 list_for_each_entry(dev
, head
, unreg_list
)
5543 static void rollback_registered(struct net_device
*dev
)
5547 list_add(&dev
->unreg_list
, &single
);
5548 rollback_registered_many(&single
);
5552 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5553 netdev_features_t features
)
5555 /* Fix illegal checksum combinations */
5556 if ((features
& NETIF_F_HW_CSUM
) &&
5557 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5558 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5559 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5562 /* TSO requires that SG is present as well. */
5563 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5564 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5565 features
&= ~NETIF_F_ALL_TSO
;
5568 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
5569 !(features
& NETIF_F_IP_CSUM
)) {
5570 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
5571 features
&= ~NETIF_F_TSO
;
5572 features
&= ~NETIF_F_TSO_ECN
;
5575 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
5576 !(features
& NETIF_F_IPV6_CSUM
)) {
5577 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
5578 features
&= ~NETIF_F_TSO6
;
5581 /* TSO ECN requires that TSO is present as well. */
5582 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5583 features
&= ~NETIF_F_TSO_ECN
;
5585 /* Software GSO depends on SG. */
5586 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5587 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5588 features
&= ~NETIF_F_GSO
;
5591 /* UFO needs SG and checksumming */
5592 if (features
& NETIF_F_UFO
) {
5593 /* maybe split UFO into V4 and V6? */
5594 if (!((features
& NETIF_F_GEN_CSUM
) ||
5595 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5596 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5598 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5599 features
&= ~NETIF_F_UFO
;
5602 if (!(features
& NETIF_F_SG
)) {
5604 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5605 features
&= ~NETIF_F_UFO
;
5612 int __netdev_update_features(struct net_device
*dev
)
5614 netdev_features_t features
;
5619 features
= netdev_get_wanted_features(dev
);
5621 if (dev
->netdev_ops
->ndo_fix_features
)
5622 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5624 /* driver might be less strict about feature dependencies */
5625 features
= netdev_fix_features(dev
, features
);
5627 if (dev
->features
== features
)
5630 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5631 &dev
->features
, &features
);
5633 if (dev
->netdev_ops
->ndo_set_features
)
5634 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5636 if (unlikely(err
< 0)) {
5638 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5639 err
, &features
, &dev
->features
);
5644 dev
->features
= features
;
5650 * netdev_update_features - recalculate device features
5651 * @dev: the device to check
5653 * Recalculate dev->features set and send notifications if it
5654 * has changed. Should be called after driver or hardware dependent
5655 * conditions might have changed that influence the features.
5657 void netdev_update_features(struct net_device
*dev
)
5659 if (__netdev_update_features(dev
))
5660 netdev_features_change(dev
);
5662 EXPORT_SYMBOL(netdev_update_features
);
5665 * netdev_change_features - recalculate device features
5666 * @dev: the device to check
5668 * Recalculate dev->features set and send notifications even
5669 * if they have not changed. Should be called instead of
5670 * netdev_update_features() if also dev->vlan_features might
5671 * have changed to allow the changes to be propagated to stacked
5674 void netdev_change_features(struct net_device
*dev
)
5676 __netdev_update_features(dev
);
5677 netdev_features_change(dev
);
5679 EXPORT_SYMBOL(netdev_change_features
);
5682 * netif_stacked_transfer_operstate - transfer operstate
5683 * @rootdev: the root or lower level device to transfer state from
5684 * @dev: the device to transfer operstate to
5686 * Transfer operational state from root to device. This is normally
5687 * called when a stacking relationship exists between the root
5688 * device and the device(a leaf device).
5690 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5691 struct net_device
*dev
)
5693 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5694 netif_dormant_on(dev
);
5696 netif_dormant_off(dev
);
5698 if (netif_carrier_ok(rootdev
)) {
5699 if (!netif_carrier_ok(dev
))
5700 netif_carrier_on(dev
);
5702 if (netif_carrier_ok(dev
))
5703 netif_carrier_off(dev
);
5706 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5709 static int netif_alloc_rx_queues(struct net_device
*dev
)
5711 unsigned int i
, count
= dev
->num_rx_queues
;
5712 struct netdev_rx_queue
*rx
;
5716 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5722 for (i
= 0; i
< count
; i
++)
5728 static void netdev_init_one_queue(struct net_device
*dev
,
5729 struct netdev_queue
*queue
, void *_unused
)
5731 /* Initialize queue lock */
5732 spin_lock_init(&queue
->_xmit_lock
);
5733 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5734 queue
->xmit_lock_owner
= -1;
5735 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5738 dql_init(&queue
->dql
, HZ
);
5742 static void netif_free_tx_queues(struct net_device
*dev
)
5744 if (is_vmalloc_addr(dev
->_tx
))
5750 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5752 unsigned int count
= dev
->num_tx_queues
;
5753 struct netdev_queue
*tx
;
5754 size_t sz
= count
* sizeof(*tx
);
5756 BUG_ON(count
< 1 || count
> 0xffff);
5758 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
5766 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5767 spin_lock_init(&dev
->tx_global_lock
);
5773 * register_netdevice - register a network device
5774 * @dev: device to register
5776 * Take a completed network device structure and add it to the kernel
5777 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5778 * chain. 0 is returned on success. A negative errno code is returned
5779 * on a failure to set up the device, or if the name is a duplicate.
5781 * Callers must hold the rtnl semaphore. You may want
5782 * register_netdev() instead of this.
5785 * The locking appears insufficient to guarantee two parallel registers
5786 * will not get the same name.
5789 int register_netdevice(struct net_device
*dev
)
5792 struct net
*net
= dev_net(dev
);
5794 BUG_ON(dev_boot_phase
);
5799 /* When net_device's are persistent, this will be fatal. */
5800 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5803 spin_lock_init(&dev
->addr_list_lock
);
5804 netdev_set_addr_lockdep_class(dev
);
5808 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
5812 /* Init, if this function is available */
5813 if (dev
->netdev_ops
->ndo_init
) {
5814 ret
= dev
->netdev_ops
->ndo_init(dev
);
5822 if (((dev
->hw_features
| dev
->features
) &
5823 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
5824 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
5825 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
5826 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
5833 dev
->ifindex
= dev_new_index(net
);
5834 else if (__dev_get_by_index(net
, dev
->ifindex
))
5837 if (dev
->iflink
== -1)
5838 dev
->iflink
= dev
->ifindex
;
5840 /* Transfer changeable features to wanted_features and enable
5841 * software offloads (GSO and GRO).
5843 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
5844 dev
->features
|= NETIF_F_SOFT_FEATURES
;
5845 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
5847 if (!(dev
->flags
& IFF_LOOPBACK
)) {
5848 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
5851 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5853 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
5855 /* Make NETIF_F_SG inheritable to tunnel devices.
5857 dev
->hw_enc_features
|= NETIF_F_SG
;
5859 /* Make NETIF_F_SG inheritable to MPLS.
5861 dev
->mpls_features
|= NETIF_F_SG
;
5863 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5864 ret
= notifier_to_errno(ret
);
5868 ret
= netdev_register_kobject(dev
);
5871 dev
->reg_state
= NETREG_REGISTERED
;
5873 __netdev_update_features(dev
);
5876 * Default initial state at registry is that the
5877 * device is present.
5880 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5882 linkwatch_init_dev(dev
);
5884 dev_init_scheduler(dev
);
5886 list_netdevice(dev
);
5887 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5889 /* If the device has permanent device address, driver should
5890 * set dev_addr and also addr_assign_type should be set to
5891 * NET_ADDR_PERM (default value).
5893 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
5894 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
5896 /* Notify protocols, that a new device appeared. */
5897 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5898 ret
= notifier_to_errno(ret
);
5900 rollback_registered(dev
);
5901 dev
->reg_state
= NETREG_UNREGISTERED
;
5904 * Prevent userspace races by waiting until the network
5905 * device is fully setup before sending notifications.
5907 if (!dev
->rtnl_link_ops
||
5908 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5909 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
5915 if (dev
->netdev_ops
->ndo_uninit
)
5916 dev
->netdev_ops
->ndo_uninit(dev
);
5919 EXPORT_SYMBOL(register_netdevice
);
5922 * init_dummy_netdev - init a dummy network device for NAPI
5923 * @dev: device to init
5925 * This takes a network device structure and initialize the minimum
5926 * amount of fields so it can be used to schedule NAPI polls without
5927 * registering a full blown interface. This is to be used by drivers
5928 * that need to tie several hardware interfaces to a single NAPI
5929 * poll scheduler due to HW limitations.
5931 int init_dummy_netdev(struct net_device
*dev
)
5933 /* Clear everything. Note we don't initialize spinlocks
5934 * are they aren't supposed to be taken by any of the
5935 * NAPI code and this dummy netdev is supposed to be
5936 * only ever used for NAPI polls
5938 memset(dev
, 0, sizeof(struct net_device
));
5940 /* make sure we BUG if trying to hit standard
5941 * register/unregister code path
5943 dev
->reg_state
= NETREG_DUMMY
;
5945 /* NAPI wants this */
5946 INIT_LIST_HEAD(&dev
->napi_list
);
5948 /* a dummy interface is started by default */
5949 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5950 set_bit(__LINK_STATE_START
, &dev
->state
);
5952 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5953 * because users of this 'device' dont need to change
5959 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5963 * register_netdev - register a network device
5964 * @dev: device to register
5966 * Take a completed network device structure and add it to the kernel
5967 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5968 * chain. 0 is returned on success. A negative errno code is returned
5969 * on a failure to set up the device, or if the name is a duplicate.
5971 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5972 * and expands the device name if you passed a format string to
5975 int register_netdev(struct net_device
*dev
)
5980 err
= register_netdevice(dev
);
5984 EXPORT_SYMBOL(register_netdev
);
5986 int netdev_refcnt_read(const struct net_device
*dev
)
5990 for_each_possible_cpu(i
)
5991 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
5994 EXPORT_SYMBOL(netdev_refcnt_read
);
5997 * netdev_wait_allrefs - wait until all references are gone.
5998 * @dev: target net_device
6000 * This is called when unregistering network devices.
6002 * Any protocol or device that holds a reference should register
6003 * for netdevice notification, and cleanup and put back the
6004 * reference if they receive an UNREGISTER event.
6005 * We can get stuck here if buggy protocols don't correctly
6008 static void netdev_wait_allrefs(struct net_device
*dev
)
6010 unsigned long rebroadcast_time
, warning_time
;
6013 linkwatch_forget_dev(dev
);
6015 rebroadcast_time
= warning_time
= jiffies
;
6016 refcnt
= netdev_refcnt_read(dev
);
6018 while (refcnt
!= 0) {
6019 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
6022 /* Rebroadcast unregister notification */
6023 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6029 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6030 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
6032 /* We must not have linkwatch events
6033 * pending on unregister. If this
6034 * happens, we simply run the queue
6035 * unscheduled, resulting in a noop
6038 linkwatch_run_queue();
6043 rebroadcast_time
= jiffies
;
6048 refcnt
= netdev_refcnt_read(dev
);
6050 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
6051 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6053 warning_time
= jiffies
;
6062 * register_netdevice(x1);
6063 * register_netdevice(x2);
6065 * unregister_netdevice(y1);
6066 * unregister_netdevice(y2);
6072 * We are invoked by rtnl_unlock().
6073 * This allows us to deal with problems:
6074 * 1) We can delete sysfs objects which invoke hotplug
6075 * without deadlocking with linkwatch via keventd.
6076 * 2) Since we run with the RTNL semaphore not held, we can sleep
6077 * safely in order to wait for the netdev refcnt to drop to zero.
6079 * We must not return until all unregister events added during
6080 * the interval the lock was held have been completed.
6082 void netdev_run_todo(void)
6084 struct list_head list
;
6086 /* Snapshot list, allow later requests */
6087 list_replace_init(&net_todo_list
, &list
);
6092 /* Wait for rcu callbacks to finish before next phase */
6093 if (!list_empty(&list
))
6096 while (!list_empty(&list
)) {
6097 struct net_device
*dev
6098 = list_first_entry(&list
, struct net_device
, todo_list
);
6099 list_del(&dev
->todo_list
);
6102 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6105 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
6106 pr_err("network todo '%s' but state %d\n",
6107 dev
->name
, dev
->reg_state
);
6112 dev
->reg_state
= NETREG_UNREGISTERED
;
6114 on_each_cpu(flush_backlog
, dev
, 1);
6116 netdev_wait_allrefs(dev
);
6119 BUG_ON(netdev_refcnt_read(dev
));
6120 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
6121 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
6122 WARN_ON(dev
->dn_ptr
);
6124 if (dev
->destructor
)
6125 dev
->destructor(dev
);
6127 /* Report a network device has been unregistered */
6129 dev_net(dev
)->dev_unreg_count
--;
6131 wake_up(&netdev_unregistering_wq
);
6133 /* Free network device */
6134 kobject_put(&dev
->dev
.kobj
);
6138 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6139 * fields in the same order, with only the type differing.
6141 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
6142 const struct net_device_stats
*netdev_stats
)
6144 #if BITS_PER_LONG == 64
6145 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
6146 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
6148 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
6149 const unsigned long *src
= (const unsigned long *)netdev_stats
;
6150 u64
*dst
= (u64
*)stats64
;
6152 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
6153 sizeof(*stats64
) / sizeof(u64
));
6154 for (i
= 0; i
< n
; i
++)
6158 EXPORT_SYMBOL(netdev_stats_to_stats64
);
6161 * dev_get_stats - get network device statistics
6162 * @dev: device to get statistics from
6163 * @storage: place to store stats
6165 * Get network statistics from device. Return @storage.
6166 * The device driver may provide its own method by setting
6167 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6168 * otherwise the internal statistics structure is used.
6170 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
6171 struct rtnl_link_stats64
*storage
)
6173 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6175 if (ops
->ndo_get_stats64
) {
6176 memset(storage
, 0, sizeof(*storage
));
6177 ops
->ndo_get_stats64(dev
, storage
);
6178 } else if (ops
->ndo_get_stats
) {
6179 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
6181 netdev_stats_to_stats64(storage
, &dev
->stats
);
6183 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
6186 EXPORT_SYMBOL(dev_get_stats
);
6188 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
6190 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
6192 #ifdef CONFIG_NET_CLS_ACT
6195 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
6198 netdev_init_one_queue(dev
, queue
, NULL
);
6199 queue
->qdisc
= &noop_qdisc
;
6200 queue
->qdisc_sleeping
= &noop_qdisc
;
6201 rcu_assign_pointer(dev
->ingress_queue
, queue
);
6206 static const struct ethtool_ops default_ethtool_ops
;
6208 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
6209 const struct ethtool_ops
*ops
)
6211 if (dev
->ethtool_ops
== &default_ethtool_ops
)
6212 dev
->ethtool_ops
= ops
;
6214 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
6216 void netdev_freemem(struct net_device
*dev
)
6218 char *addr
= (char *)dev
- dev
->padded
;
6220 if (is_vmalloc_addr(addr
))
6227 * alloc_netdev_mqs - allocate network device
6228 * @sizeof_priv: size of private data to allocate space for
6229 * @name: device name format string
6230 * @setup: callback to initialize device
6231 * @txqs: the number of TX subqueues to allocate
6232 * @rxqs: the number of RX subqueues to allocate
6234 * Allocates a struct net_device with private data area for driver use
6235 * and performs basic initialization. Also allocates subquue structs
6236 * for each queue on the device.
6238 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
6239 void (*setup
)(struct net_device
*),
6240 unsigned int txqs
, unsigned int rxqs
)
6242 struct net_device
*dev
;
6244 struct net_device
*p
;
6246 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
6249 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6255 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6260 alloc_size
= sizeof(struct net_device
);
6262 /* ensure 32-byte alignment of private area */
6263 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
6264 alloc_size
+= sizeof_priv
;
6266 /* ensure 32-byte alignment of whole construct */
6267 alloc_size
+= NETDEV_ALIGN
- 1;
6269 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6271 p
= vzalloc(alloc_size
);
6275 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
6276 dev
->padded
= (char *)dev
- (char *)p
;
6278 dev
->pcpu_refcnt
= alloc_percpu(int);
6279 if (!dev
->pcpu_refcnt
)
6282 if (dev_addr_init(dev
))
6288 dev_net_set(dev
, &init_net
);
6290 dev
->gso_max_size
= GSO_MAX_SIZE
;
6291 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6293 INIT_LIST_HEAD(&dev
->napi_list
);
6294 INIT_LIST_HEAD(&dev
->unreg_list
);
6295 INIT_LIST_HEAD(&dev
->close_list
);
6296 INIT_LIST_HEAD(&dev
->link_watch_list
);
6297 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
6298 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
6299 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
6300 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
6301 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
6304 dev
->num_tx_queues
= txqs
;
6305 dev
->real_num_tx_queues
= txqs
;
6306 if (netif_alloc_netdev_queues(dev
))
6310 dev
->num_rx_queues
= rxqs
;
6311 dev
->real_num_rx_queues
= rxqs
;
6312 if (netif_alloc_rx_queues(dev
))
6316 strcpy(dev
->name
, name
);
6317 dev
->group
= INIT_NETDEV_GROUP
;
6318 if (!dev
->ethtool_ops
)
6319 dev
->ethtool_ops
= &default_ethtool_ops
;
6327 free_percpu(dev
->pcpu_refcnt
);
6328 netif_free_tx_queues(dev
);
6334 netdev_freemem(dev
);
6337 EXPORT_SYMBOL(alloc_netdev_mqs
);
6340 * free_netdev - free network device
6343 * This function does the last stage of destroying an allocated device
6344 * interface. The reference to the device object is released.
6345 * If this is the last reference then it will be freed.
6347 void free_netdev(struct net_device
*dev
)
6349 struct napi_struct
*p
, *n
;
6351 release_net(dev_net(dev
));
6353 netif_free_tx_queues(dev
);
6358 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6360 /* Flush device addresses */
6361 dev_addr_flush(dev
);
6363 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6366 free_percpu(dev
->pcpu_refcnt
);
6367 dev
->pcpu_refcnt
= NULL
;
6369 /* Compatibility with error handling in drivers */
6370 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6371 netdev_freemem(dev
);
6375 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6376 dev
->reg_state
= NETREG_RELEASED
;
6378 /* will free via device release */
6379 put_device(&dev
->dev
);
6381 EXPORT_SYMBOL(free_netdev
);
6384 * synchronize_net - Synchronize with packet receive processing
6386 * Wait for packets currently being received to be done.
6387 * Does not block later packets from starting.
6389 void synchronize_net(void)
6392 if (rtnl_is_locked())
6393 synchronize_rcu_expedited();
6397 EXPORT_SYMBOL(synchronize_net
);
6400 * unregister_netdevice_queue - remove device from the kernel
6404 * This function shuts down a device interface and removes it
6405 * from the kernel tables.
6406 * If head not NULL, device is queued to be unregistered later.
6408 * Callers must hold the rtnl semaphore. You may want
6409 * unregister_netdev() instead of this.
6412 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6417 list_move_tail(&dev
->unreg_list
, head
);
6419 rollback_registered(dev
);
6420 /* Finish processing unregister after unlock */
6424 EXPORT_SYMBOL(unregister_netdevice_queue
);
6427 * unregister_netdevice_many - unregister many devices
6428 * @head: list of devices
6430 void unregister_netdevice_many(struct list_head
*head
)
6432 struct net_device
*dev
;
6434 if (!list_empty(head
)) {
6435 rollback_registered_many(head
);
6436 list_for_each_entry(dev
, head
, unreg_list
)
6440 EXPORT_SYMBOL(unregister_netdevice_many
);
6443 * unregister_netdev - remove device from the kernel
6446 * This function shuts down a device interface and removes it
6447 * from the kernel tables.
6449 * This is just a wrapper for unregister_netdevice that takes
6450 * the rtnl semaphore. In general you want to use this and not
6451 * unregister_netdevice.
6453 void unregister_netdev(struct net_device
*dev
)
6456 unregister_netdevice(dev
);
6459 EXPORT_SYMBOL(unregister_netdev
);
6462 * dev_change_net_namespace - move device to different nethost namespace
6464 * @net: network namespace
6465 * @pat: If not NULL name pattern to try if the current device name
6466 * is already taken in the destination network namespace.
6468 * This function shuts down a device interface and moves it
6469 * to a new network namespace. On success 0 is returned, on
6470 * a failure a netagive errno code is returned.
6472 * Callers must hold the rtnl semaphore.
6475 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
6481 /* Don't allow namespace local devices to be moved. */
6483 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6486 /* Ensure the device has been registrered */
6487 if (dev
->reg_state
!= NETREG_REGISTERED
)
6490 /* Get out if there is nothing todo */
6492 if (net_eq(dev_net(dev
), net
))
6495 /* Pick the destination device name, and ensure
6496 * we can use it in the destination network namespace.
6499 if (__dev_get_by_name(net
, dev
->name
)) {
6500 /* We get here if we can't use the current device name */
6503 if (dev_get_valid_name(net
, dev
, pat
) < 0)
6508 * And now a mini version of register_netdevice unregister_netdevice.
6511 /* If device is running close it first. */
6514 /* And unlink it from device chain */
6516 unlist_netdevice(dev
);
6520 /* Shutdown queueing discipline. */
6523 /* Notify protocols, that we are about to destroy
6524 this device. They should clean all the things.
6526 Note that dev->reg_state stays at NETREG_REGISTERED.
6527 This is wanted because this way 8021q and macvlan know
6528 the device is just moving and can keep their slaves up.
6530 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6532 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6533 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
6536 * Flush the unicast and multicast chains
6541 /* Send a netdev-removed uevent to the old namespace */
6542 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
6544 /* Actually switch the network namespace */
6545 dev_net_set(dev
, net
);
6547 /* If there is an ifindex conflict assign a new one */
6548 if (__dev_get_by_index(net
, dev
->ifindex
)) {
6549 int iflink
= (dev
->iflink
== dev
->ifindex
);
6550 dev
->ifindex
= dev_new_index(net
);
6552 dev
->iflink
= dev
->ifindex
;
6555 /* Send a netdev-add uevent to the new namespace */
6556 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
6558 /* Fixup kobjects */
6559 err
= device_rename(&dev
->dev
, dev
->name
);
6562 /* Add the device back in the hashes */
6563 list_netdevice(dev
);
6565 /* Notify protocols, that a new device appeared. */
6566 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6569 * Prevent userspace races by waiting until the network
6570 * device is fully setup before sending notifications.
6572 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6579 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6581 static int dev_cpu_callback(struct notifier_block
*nfb
,
6582 unsigned long action
,
6585 struct sk_buff
**list_skb
;
6586 struct sk_buff
*skb
;
6587 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6588 struct softnet_data
*sd
, *oldsd
;
6590 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6593 local_irq_disable();
6594 cpu
= smp_processor_id();
6595 sd
= &per_cpu(softnet_data
, cpu
);
6596 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6598 /* Find end of our completion_queue. */
6599 list_skb
= &sd
->completion_queue
;
6601 list_skb
= &(*list_skb
)->next
;
6602 /* Append completion queue from offline CPU. */
6603 *list_skb
= oldsd
->completion_queue
;
6604 oldsd
->completion_queue
= NULL
;
6606 /* Append output queue from offline CPU. */
6607 if (oldsd
->output_queue
) {
6608 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6609 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6610 oldsd
->output_queue
= NULL
;
6611 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6613 /* Append NAPI poll list from offline CPU. */
6614 if (!list_empty(&oldsd
->poll_list
)) {
6615 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6616 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6619 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6622 /* Process offline CPU's input_pkt_queue */
6623 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6625 input_queue_head_incr(oldsd
);
6627 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6629 input_queue_head_incr(oldsd
);
6637 * netdev_increment_features - increment feature set by one
6638 * @all: current feature set
6639 * @one: new feature set
6640 * @mask: mask feature set
6642 * Computes a new feature set after adding a device with feature set
6643 * @one to the master device with current feature set @all. Will not
6644 * enable anything that is off in @mask. Returns the new feature set.
6646 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6647 netdev_features_t one
, netdev_features_t mask
)
6649 if (mask
& NETIF_F_GEN_CSUM
)
6650 mask
|= NETIF_F_ALL_CSUM
;
6651 mask
|= NETIF_F_VLAN_CHALLENGED
;
6653 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
6654 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
6656 /* If one device supports hw checksumming, set for all. */
6657 if (all
& NETIF_F_GEN_CSUM
)
6658 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6662 EXPORT_SYMBOL(netdev_increment_features
);
6664 static struct hlist_head
* __net_init
netdev_create_hash(void)
6667 struct hlist_head
*hash
;
6669 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6671 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6672 INIT_HLIST_HEAD(&hash
[i
]);
6677 /* Initialize per network namespace state */
6678 static int __net_init
netdev_init(struct net
*net
)
6680 if (net
!= &init_net
)
6681 INIT_LIST_HEAD(&net
->dev_base_head
);
6683 net
->dev_name_head
= netdev_create_hash();
6684 if (net
->dev_name_head
== NULL
)
6687 net
->dev_index_head
= netdev_create_hash();
6688 if (net
->dev_index_head
== NULL
)
6694 kfree(net
->dev_name_head
);
6700 * netdev_drivername - network driver for the device
6701 * @dev: network device
6703 * Determine network driver for device.
6705 const char *netdev_drivername(const struct net_device
*dev
)
6707 const struct device_driver
*driver
;
6708 const struct device
*parent
;
6709 const char *empty
= "";
6711 parent
= dev
->dev
.parent
;
6715 driver
= parent
->driver
;
6716 if (driver
&& driver
->name
)
6717 return driver
->name
;
6721 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
6722 struct va_format
*vaf
)
6726 if (dev
&& dev
->dev
.parent
) {
6727 r
= dev_printk_emit(level
[1] - '0',
6730 dev_driver_string(dev
->dev
.parent
),
6731 dev_name(dev
->dev
.parent
),
6732 netdev_name(dev
), vaf
);
6734 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6736 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6742 int netdev_printk(const char *level
, const struct net_device
*dev
,
6743 const char *format
, ...)
6745 struct va_format vaf
;
6749 va_start(args
, format
);
6754 r
= __netdev_printk(level
, dev
, &vaf
);
6760 EXPORT_SYMBOL(netdev_printk
);
6762 #define define_netdev_printk_level(func, level) \
6763 int func(const struct net_device *dev, const char *fmt, ...) \
6766 struct va_format vaf; \
6769 va_start(args, fmt); \
6774 r = __netdev_printk(level, dev, &vaf); \
6780 EXPORT_SYMBOL(func);
6782 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6783 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6784 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6785 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6786 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6787 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6788 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6790 static void __net_exit
netdev_exit(struct net
*net
)
6792 kfree(net
->dev_name_head
);
6793 kfree(net
->dev_index_head
);
6796 static struct pernet_operations __net_initdata netdev_net_ops
= {
6797 .init
= netdev_init
,
6798 .exit
= netdev_exit
,
6801 static void __net_exit
default_device_exit(struct net
*net
)
6803 struct net_device
*dev
, *aux
;
6805 * Push all migratable network devices back to the
6806 * initial network namespace
6809 for_each_netdev_safe(net
, dev
, aux
) {
6811 char fb_name
[IFNAMSIZ
];
6813 /* Ignore unmoveable devices (i.e. loopback) */
6814 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6817 /* Leave virtual devices for the generic cleanup */
6818 if (dev
->rtnl_link_ops
)
6821 /* Push remaining network devices to init_net */
6822 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6823 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6825 pr_emerg("%s: failed to move %s to init_net: %d\n",
6826 __func__
, dev
->name
, err
);
6833 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
6835 /* Return with the rtnl_lock held when there are no network
6836 * devices unregistering in any network namespace in net_list.
6843 prepare_to_wait(&netdev_unregistering_wq
, &wait
,
6844 TASK_UNINTERRUPTIBLE
);
6845 unregistering
= false;
6847 list_for_each_entry(net
, net_list
, exit_list
) {
6848 if (net
->dev_unreg_count
> 0) {
6849 unregistering
= true;
6858 finish_wait(&netdev_unregistering_wq
, &wait
);
6861 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6863 /* At exit all network devices most be removed from a network
6864 * namespace. Do this in the reverse order of registration.
6865 * Do this across as many network namespaces as possible to
6866 * improve batching efficiency.
6868 struct net_device
*dev
;
6870 LIST_HEAD(dev_kill_list
);
6872 /* To prevent network device cleanup code from dereferencing
6873 * loopback devices or network devices that have been freed
6874 * wait here for all pending unregistrations to complete,
6875 * before unregistring the loopback device and allowing the
6876 * network namespace be freed.
6878 * The netdev todo list containing all network devices
6879 * unregistrations that happen in default_device_exit_batch
6880 * will run in the rtnl_unlock() at the end of
6881 * default_device_exit_batch.
6883 rtnl_lock_unregistering(net_list
);
6884 list_for_each_entry(net
, net_list
, exit_list
) {
6885 for_each_netdev_reverse(net
, dev
) {
6886 if (dev
->rtnl_link_ops
)
6887 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6889 unregister_netdevice_queue(dev
, &dev_kill_list
);
6892 unregister_netdevice_many(&dev_kill_list
);
6893 list_del(&dev_kill_list
);
6897 static struct pernet_operations __net_initdata default_device_ops
= {
6898 .exit
= default_device_exit
,
6899 .exit_batch
= default_device_exit_batch
,
6903 * Initialize the DEV module. At boot time this walks the device list and
6904 * unhooks any devices that fail to initialise (normally hardware not
6905 * present) and leaves us with a valid list of present and active devices.
6910 * This is called single threaded during boot, so no need
6911 * to take the rtnl semaphore.
6913 static int __init
net_dev_init(void)
6915 int i
, rc
= -ENOMEM
;
6917 BUG_ON(!dev_boot_phase
);
6919 if (dev_proc_init())
6922 if (netdev_kobject_init())
6925 INIT_LIST_HEAD(&ptype_all
);
6926 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6927 INIT_LIST_HEAD(&ptype_base
[i
]);
6929 INIT_LIST_HEAD(&offload_base
);
6931 if (register_pernet_subsys(&netdev_net_ops
))
6935 * Initialise the packet receive queues.
6938 for_each_possible_cpu(i
) {
6939 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6941 memset(sd
, 0, sizeof(*sd
));
6942 skb_queue_head_init(&sd
->input_pkt_queue
);
6943 skb_queue_head_init(&sd
->process_queue
);
6944 sd
->completion_queue
= NULL
;
6945 INIT_LIST_HEAD(&sd
->poll_list
);
6946 sd
->output_queue
= NULL
;
6947 sd
->output_queue_tailp
= &sd
->output_queue
;
6949 sd
->csd
.func
= rps_trigger_softirq
;
6955 sd
->backlog
.poll
= process_backlog
;
6956 sd
->backlog
.weight
= weight_p
;
6957 sd
->backlog
.gro_list
= NULL
;
6958 sd
->backlog
.gro_count
= 0;
6960 #ifdef CONFIG_NET_FLOW_LIMIT
6961 sd
->flow_limit
= NULL
;
6967 /* The loopback device is special if any other network devices
6968 * is present in a network namespace the loopback device must
6969 * be present. Since we now dynamically allocate and free the
6970 * loopback device ensure this invariant is maintained by
6971 * keeping the loopback device as the first device on the
6972 * list of network devices. Ensuring the loopback devices
6973 * is the first device that appears and the last network device
6976 if (register_pernet_device(&loopback_net_ops
))
6979 if (register_pernet_device(&default_device_ops
))
6982 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6983 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6985 hotcpu_notifier(dev_cpu_callback
, 0);
6992 subsys_initcall(net_dev_init
);