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 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
);
501 EXPORT_SYMBOL(__dev_remove_offload
);
504 * dev_remove_offload - remove packet offload handler
505 * @po: packet offload declaration
507 * Remove a packet offload handler that was previously added to the kernel
508 * offload handlers by dev_add_offload(). The passed &offload_type is
509 * removed from the kernel lists and can be freed or reused once this
512 * This call sleeps to guarantee that no CPU is looking at the packet
515 void dev_remove_offload(struct packet_offload
*po
)
517 __dev_remove_offload(po
);
521 EXPORT_SYMBOL(dev_remove_offload
);
523 /******************************************************************************
525 Device Boot-time Settings Routines
527 *******************************************************************************/
529 /* Boot time configuration table */
530 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
533 * netdev_boot_setup_add - add new setup entry
534 * @name: name of the device
535 * @map: configured settings for the device
537 * Adds new setup entry to the dev_boot_setup list. The function
538 * returns 0 on error and 1 on success. This is a generic routine to
541 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
543 struct netdev_boot_setup
*s
;
547 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
548 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
549 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
550 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
551 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
556 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
560 * netdev_boot_setup_check - check boot time settings
561 * @dev: the netdevice
563 * Check boot time settings for the device.
564 * The found settings are set for the device to be used
565 * later in the device probing.
566 * Returns 0 if no settings found, 1 if they are.
568 int netdev_boot_setup_check(struct net_device
*dev
)
570 struct netdev_boot_setup
*s
= dev_boot_setup
;
573 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
574 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
575 !strcmp(dev
->name
, s
[i
].name
)) {
576 dev
->irq
= s
[i
].map
.irq
;
577 dev
->base_addr
= s
[i
].map
.base_addr
;
578 dev
->mem_start
= s
[i
].map
.mem_start
;
579 dev
->mem_end
= s
[i
].map
.mem_end
;
585 EXPORT_SYMBOL(netdev_boot_setup_check
);
589 * netdev_boot_base - get address from boot time settings
590 * @prefix: prefix for network device
591 * @unit: id for network device
593 * Check boot time settings for the base address of device.
594 * The found settings are set for the device to be used
595 * later in the device probing.
596 * Returns 0 if no settings found.
598 unsigned long netdev_boot_base(const char *prefix
, int unit
)
600 const struct netdev_boot_setup
*s
= dev_boot_setup
;
604 sprintf(name
, "%s%d", prefix
, unit
);
607 * If device already registered then return base of 1
608 * to indicate not to probe for this interface
610 if (__dev_get_by_name(&init_net
, name
))
613 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
614 if (!strcmp(name
, s
[i
].name
))
615 return s
[i
].map
.base_addr
;
620 * Saves at boot time configured settings for any netdevice.
622 int __init
netdev_boot_setup(char *str
)
627 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
632 memset(&map
, 0, sizeof(map
));
636 map
.base_addr
= ints
[2];
638 map
.mem_start
= ints
[3];
640 map
.mem_end
= ints
[4];
642 /* Add new entry to the list */
643 return netdev_boot_setup_add(str
, &map
);
646 __setup("netdev=", netdev_boot_setup
);
648 /*******************************************************************************
650 Device Interface Subroutines
652 *******************************************************************************/
655 * __dev_get_by_name - find a device by its name
656 * @net: the applicable net namespace
657 * @name: name to find
659 * Find an interface by name. Must be called under RTNL semaphore
660 * or @dev_base_lock. If the name is found a pointer to the device
661 * is returned. If the name is not found then %NULL is returned. The
662 * reference counters are not incremented so the caller must be
663 * careful with locks.
666 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
668 struct net_device
*dev
;
669 struct hlist_head
*head
= dev_name_hash(net
, name
);
671 hlist_for_each_entry(dev
, head
, name_hlist
)
672 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
677 EXPORT_SYMBOL(__dev_get_by_name
);
680 * dev_get_by_name_rcu - find a device by its name
681 * @net: the applicable net namespace
682 * @name: name to find
684 * Find an interface by name.
685 * If the name is found a pointer to the device is returned.
686 * If the name is not found then %NULL is returned.
687 * The reference counters are not incremented so the caller must be
688 * careful with locks. The caller must hold RCU lock.
691 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
693 struct net_device
*dev
;
694 struct hlist_head
*head
= dev_name_hash(net
, name
);
696 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
697 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
702 EXPORT_SYMBOL(dev_get_by_name_rcu
);
705 * dev_get_by_name - find a device by its name
706 * @net: the applicable net namespace
707 * @name: name to find
709 * Find an interface by name. This can be called from any
710 * context and does its own locking. The returned handle has
711 * the usage count incremented and the caller must use dev_put() to
712 * release it when it is no longer needed. %NULL is returned if no
713 * matching device is found.
716 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
718 struct net_device
*dev
;
721 dev
= dev_get_by_name_rcu(net
, name
);
727 EXPORT_SYMBOL(dev_get_by_name
);
730 * __dev_get_by_index - find a device by its ifindex
731 * @net: the applicable net namespace
732 * @ifindex: index of device
734 * Search for an interface by index. Returns %NULL if the device
735 * is not found or a pointer to the device. The device has not
736 * had its reference counter increased so the caller must be careful
737 * about locking. The caller must hold either the RTNL semaphore
741 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
743 struct net_device
*dev
;
744 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
746 hlist_for_each_entry(dev
, head
, index_hlist
)
747 if (dev
->ifindex
== ifindex
)
752 EXPORT_SYMBOL(__dev_get_by_index
);
755 * dev_get_by_index_rcu - find a device by its ifindex
756 * @net: the applicable net namespace
757 * @ifindex: index of device
759 * Search for an interface by index. Returns %NULL if the device
760 * is not found or a pointer to the device. The device has not
761 * had its reference counter increased so the caller must be careful
762 * about locking. The caller must hold RCU lock.
765 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
767 struct net_device
*dev
;
768 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
770 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
771 if (dev
->ifindex
== ifindex
)
776 EXPORT_SYMBOL(dev_get_by_index_rcu
);
780 * dev_get_by_index - find a device by its ifindex
781 * @net: the applicable net namespace
782 * @ifindex: index of device
784 * Search for an interface by index. Returns NULL if the device
785 * is not found or a pointer to the device. The device returned has
786 * had a reference added and the pointer is safe until the user calls
787 * dev_put to indicate they have finished with it.
790 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
792 struct net_device
*dev
;
795 dev
= dev_get_by_index_rcu(net
, ifindex
);
801 EXPORT_SYMBOL(dev_get_by_index
);
804 * netdev_get_name - get a netdevice name, knowing its ifindex.
805 * @net: network namespace
806 * @name: a pointer to the buffer where the name will be stored.
807 * @ifindex: the ifindex of the interface to get the name from.
809 * The use of raw_seqcount_begin() and cond_resched() before
810 * retrying is required as we want to give the writers a chance
811 * to complete when CONFIG_PREEMPT is not set.
813 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
815 struct net_device
*dev
;
819 seq
= raw_seqcount_begin(&devnet_rename_seq
);
821 dev
= dev_get_by_index_rcu(net
, ifindex
);
827 strcpy(name
, dev
->name
);
829 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
838 * dev_getbyhwaddr_rcu - find a device by its hardware address
839 * @net: the applicable net namespace
840 * @type: media type of device
841 * @ha: hardware address
843 * Search for an interface by MAC address. Returns NULL if the device
844 * is not found or a pointer to the device.
845 * The caller must hold RCU or RTNL.
846 * The returned device has not had its ref count increased
847 * and the caller must therefore be careful about locking
851 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
854 struct net_device
*dev
;
856 for_each_netdev_rcu(net
, dev
)
857 if (dev
->type
== type
&&
858 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
863 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
865 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
867 struct net_device
*dev
;
870 for_each_netdev(net
, dev
)
871 if (dev
->type
== type
)
876 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
878 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
880 struct net_device
*dev
, *ret
= NULL
;
883 for_each_netdev_rcu(net
, dev
)
884 if (dev
->type
== type
) {
892 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
895 * dev_get_by_flags_rcu - find any device with given flags
896 * @net: the applicable net namespace
897 * @if_flags: IFF_* values
898 * @mask: bitmask of bits in if_flags to check
900 * Search for any interface with the given flags. Returns NULL if a device
901 * is not found or a pointer to the device. Must be called inside
902 * rcu_read_lock(), and result refcount is unchanged.
905 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
908 struct net_device
*dev
, *ret
;
911 for_each_netdev_rcu(net
, dev
) {
912 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
919 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
922 * dev_valid_name - check if name is okay for network device
925 * Network device names need to be valid file names to
926 * to allow sysfs to work. We also disallow any kind of
929 bool dev_valid_name(const char *name
)
933 if (strlen(name
) >= IFNAMSIZ
)
935 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
939 if (*name
== '/' || isspace(*name
))
945 EXPORT_SYMBOL(dev_valid_name
);
948 * __dev_alloc_name - allocate a name for a device
949 * @net: network namespace to allocate the device name in
950 * @name: name format string
951 * @buf: scratch buffer and result name string
953 * Passed a format string - eg "lt%d" it will try and find a suitable
954 * id. It scans list of devices to build up a free map, then chooses
955 * the first empty slot. The caller must hold the dev_base or rtnl lock
956 * while allocating the name and adding the device in order to avoid
958 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
959 * Returns the number of the unit assigned or a negative errno code.
962 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
966 const int max_netdevices
= 8*PAGE_SIZE
;
967 unsigned long *inuse
;
968 struct net_device
*d
;
970 p
= strnchr(name
, IFNAMSIZ
-1, '%');
973 * Verify the string as this thing may have come from
974 * the user. There must be either one "%d" and no other "%"
977 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
980 /* Use one page as a bit array of possible slots */
981 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
985 for_each_netdev(net
, d
) {
986 if (!sscanf(d
->name
, name
, &i
))
988 if (i
< 0 || i
>= max_netdevices
)
991 /* avoid cases where sscanf is not exact inverse of printf */
992 snprintf(buf
, IFNAMSIZ
, name
, i
);
993 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
997 i
= find_first_zero_bit(inuse
, max_netdevices
);
998 free_page((unsigned long) inuse
);
1002 snprintf(buf
, IFNAMSIZ
, name
, i
);
1003 if (!__dev_get_by_name(net
, buf
))
1006 /* It is possible to run out of possible slots
1007 * when the name is long and there isn't enough space left
1008 * for the digits, or if all bits are used.
1014 * dev_alloc_name - allocate a name for a device
1016 * @name: name format string
1018 * Passed a format string - eg "lt%d" it will try and find a suitable
1019 * id. It scans list of devices to build up a free map, then chooses
1020 * the first empty slot. The caller must hold the dev_base or rtnl lock
1021 * while allocating the name and adding the device in order to avoid
1023 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1024 * Returns the number of the unit assigned or a negative errno code.
1027 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1033 BUG_ON(!dev_net(dev
));
1035 ret
= __dev_alloc_name(net
, name
, buf
);
1037 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1040 EXPORT_SYMBOL(dev_alloc_name
);
1042 static int dev_alloc_name_ns(struct net
*net
,
1043 struct net_device
*dev
,
1049 ret
= __dev_alloc_name(net
, name
, buf
);
1051 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1055 static int dev_get_valid_name(struct net
*net
,
1056 struct net_device
*dev
,
1061 if (!dev_valid_name(name
))
1064 if (strchr(name
, '%'))
1065 return dev_alloc_name_ns(net
, dev
, name
);
1066 else if (__dev_get_by_name(net
, name
))
1068 else if (dev
->name
!= name
)
1069 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1075 * dev_change_name - change name of a device
1077 * @newname: name (or format string) must be at least IFNAMSIZ
1079 * Change name of a device, can pass format strings "eth%d".
1082 int dev_change_name(struct net_device
*dev
, const char *newname
)
1084 char oldname
[IFNAMSIZ
];
1090 BUG_ON(!dev_net(dev
));
1093 if (dev
->flags
& IFF_UP
)
1096 write_seqcount_begin(&devnet_rename_seq
);
1098 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1099 write_seqcount_end(&devnet_rename_seq
);
1103 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1105 err
= dev_get_valid_name(net
, dev
, newname
);
1107 write_seqcount_end(&devnet_rename_seq
);
1112 ret
= device_rename(&dev
->dev
, dev
->name
);
1114 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1115 write_seqcount_end(&devnet_rename_seq
);
1119 write_seqcount_end(&devnet_rename_seq
);
1121 write_lock_bh(&dev_base_lock
);
1122 hlist_del_rcu(&dev
->name_hlist
);
1123 write_unlock_bh(&dev_base_lock
);
1127 write_lock_bh(&dev_base_lock
);
1128 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1129 write_unlock_bh(&dev_base_lock
);
1131 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1132 ret
= notifier_to_errno(ret
);
1135 /* err >= 0 after dev_alloc_name() or stores the first errno */
1138 write_seqcount_begin(&devnet_rename_seq
);
1139 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1142 pr_err("%s: name change rollback failed: %d\n",
1151 * dev_set_alias - change ifalias of a device
1153 * @alias: name up to IFALIASZ
1154 * @len: limit of bytes to copy from info
1156 * Set ifalias for a device,
1158 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1164 if (len
>= IFALIASZ
)
1168 kfree(dev
->ifalias
);
1169 dev
->ifalias
= NULL
;
1173 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1176 dev
->ifalias
= new_ifalias
;
1178 strlcpy(dev
->ifalias
, alias
, len
+1);
1184 * netdev_features_change - device changes features
1185 * @dev: device to cause notification
1187 * Called to indicate a device has changed features.
1189 void netdev_features_change(struct net_device
*dev
)
1191 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1193 EXPORT_SYMBOL(netdev_features_change
);
1196 * netdev_state_change - device changes state
1197 * @dev: device to cause notification
1199 * Called to indicate a device has changed state. This function calls
1200 * the notifier chains for netdev_chain and sends a NEWLINK message
1201 * to the routing socket.
1203 void netdev_state_change(struct net_device
*dev
)
1205 if (dev
->flags
& IFF_UP
) {
1206 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1207 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1210 EXPORT_SYMBOL(netdev_state_change
);
1213 * netdev_notify_peers - notify network peers about existence of @dev
1214 * @dev: network device
1216 * Generate traffic such that interested network peers are aware of
1217 * @dev, such as by generating a gratuitous ARP. This may be used when
1218 * a device wants to inform the rest of the network about some sort of
1219 * reconfiguration such as a failover event or virtual machine
1222 void netdev_notify_peers(struct net_device
*dev
)
1225 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1228 EXPORT_SYMBOL(netdev_notify_peers
);
1230 static int __dev_open(struct net_device
*dev
)
1232 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1237 if (!netif_device_present(dev
))
1240 /* Block netpoll from trying to do any rx path servicing.
1241 * If we don't do this there is a chance ndo_poll_controller
1242 * or ndo_poll may be running while we open the device
1244 netpoll_rx_disable(dev
);
1246 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1247 ret
= notifier_to_errno(ret
);
1251 set_bit(__LINK_STATE_START
, &dev
->state
);
1253 if (ops
->ndo_validate_addr
)
1254 ret
= ops
->ndo_validate_addr(dev
);
1256 if (!ret
&& ops
->ndo_open
)
1257 ret
= ops
->ndo_open(dev
);
1259 netpoll_rx_enable(dev
);
1262 clear_bit(__LINK_STATE_START
, &dev
->state
);
1264 dev
->flags
|= IFF_UP
;
1265 net_dmaengine_get();
1266 dev_set_rx_mode(dev
);
1268 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1275 * dev_open - prepare an interface for use.
1276 * @dev: device to open
1278 * Takes a device from down to up state. The device's private open
1279 * function is invoked and then the multicast lists are loaded. Finally
1280 * the device is moved into the up state and a %NETDEV_UP message is
1281 * sent to the netdev notifier chain.
1283 * Calling this function on an active interface is a nop. On a failure
1284 * a negative errno code is returned.
1286 int dev_open(struct net_device
*dev
)
1290 if (dev
->flags
& IFF_UP
)
1293 ret
= __dev_open(dev
);
1297 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1298 call_netdevice_notifiers(NETDEV_UP
, dev
);
1302 EXPORT_SYMBOL(dev_open
);
1304 static int __dev_close_many(struct list_head
*head
)
1306 struct net_device
*dev
;
1311 list_for_each_entry(dev
, head
, close_list
) {
1312 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1314 clear_bit(__LINK_STATE_START
, &dev
->state
);
1316 /* Synchronize to scheduled poll. We cannot touch poll list, it
1317 * can be even on different cpu. So just clear netif_running().
1319 * dev->stop() will invoke napi_disable() on all of it's
1320 * napi_struct instances on this device.
1322 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1325 dev_deactivate_many(head
);
1327 list_for_each_entry(dev
, head
, close_list
) {
1328 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1331 * Call the device specific close. This cannot fail.
1332 * Only if device is UP
1334 * We allow it to be called even after a DETACH hot-plug
1340 dev
->flags
&= ~IFF_UP
;
1341 net_dmaengine_put();
1347 static int __dev_close(struct net_device
*dev
)
1352 /* Temporarily disable netpoll until the interface is down */
1353 netpoll_rx_disable(dev
);
1355 list_add(&dev
->close_list
, &single
);
1356 retval
= __dev_close_many(&single
);
1359 netpoll_rx_enable(dev
);
1363 static int dev_close_many(struct list_head
*head
)
1365 struct net_device
*dev
, *tmp
;
1367 /* Remove the devices that don't need to be closed */
1368 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1369 if (!(dev
->flags
& IFF_UP
))
1370 list_del_init(&dev
->close_list
);
1372 __dev_close_many(head
);
1374 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1375 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1376 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1377 list_del_init(&dev
->close_list
);
1384 * dev_close - shutdown an interface.
1385 * @dev: device to shutdown
1387 * This function moves an active device into down state. A
1388 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1389 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1392 int dev_close(struct net_device
*dev
)
1394 if (dev
->flags
& IFF_UP
) {
1397 /* Block netpoll rx while the interface is going down */
1398 netpoll_rx_disable(dev
);
1400 list_add(&dev
->close_list
, &single
);
1401 dev_close_many(&single
);
1404 netpoll_rx_enable(dev
);
1408 EXPORT_SYMBOL(dev_close
);
1412 * dev_disable_lro - disable Large Receive Offload on a device
1415 * Disable Large Receive Offload (LRO) on a net device. Must be
1416 * called under RTNL. This is needed if received packets may be
1417 * forwarded to another interface.
1419 void dev_disable_lro(struct net_device
*dev
)
1422 * If we're trying to disable lro on a vlan device
1423 * use the underlying physical device instead
1425 if (is_vlan_dev(dev
))
1426 dev
= vlan_dev_real_dev(dev
);
1428 /* the same for macvlan devices */
1429 if (netif_is_macvlan(dev
))
1430 dev
= macvlan_dev_real_dev(dev
);
1432 dev
->wanted_features
&= ~NETIF_F_LRO
;
1433 netdev_update_features(dev
);
1435 if (unlikely(dev
->features
& NETIF_F_LRO
))
1436 netdev_WARN(dev
, "failed to disable LRO!\n");
1438 EXPORT_SYMBOL(dev_disable_lro
);
1440 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1441 struct net_device
*dev
)
1443 struct netdev_notifier_info info
;
1445 netdev_notifier_info_init(&info
, dev
);
1446 return nb
->notifier_call(nb
, val
, &info
);
1449 static int dev_boot_phase
= 1;
1452 * register_netdevice_notifier - register a network notifier block
1455 * Register a notifier to be called when network device events occur.
1456 * The notifier passed is linked into the kernel structures and must
1457 * not be reused until it has been unregistered. A negative errno code
1458 * is returned on a failure.
1460 * When registered all registration and up events are replayed
1461 * to the new notifier to allow device to have a race free
1462 * view of the network device list.
1465 int register_netdevice_notifier(struct notifier_block
*nb
)
1467 struct net_device
*dev
;
1468 struct net_device
*last
;
1473 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1479 for_each_netdev(net
, dev
) {
1480 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1481 err
= notifier_to_errno(err
);
1485 if (!(dev
->flags
& IFF_UP
))
1488 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1499 for_each_netdev(net
, dev
) {
1503 if (dev
->flags
& IFF_UP
) {
1504 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1506 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1508 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1513 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1516 EXPORT_SYMBOL(register_netdevice_notifier
);
1519 * unregister_netdevice_notifier - unregister a network notifier block
1522 * Unregister a notifier previously registered by
1523 * register_netdevice_notifier(). The notifier is unlinked into the
1524 * kernel structures and may then be reused. A negative errno code
1525 * is returned on a failure.
1527 * After unregistering unregister and down device events are synthesized
1528 * for all devices on the device list to the removed notifier to remove
1529 * the need for special case cleanup code.
1532 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1534 struct net_device
*dev
;
1539 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1544 for_each_netdev(net
, dev
) {
1545 if (dev
->flags
& IFF_UP
) {
1546 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1548 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1550 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1557 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1560 * call_netdevice_notifiers_info - call all network notifier blocks
1561 * @val: value passed unmodified to notifier function
1562 * @dev: net_device pointer passed unmodified to notifier function
1563 * @info: notifier information data
1565 * Call all network notifier blocks. Parameters and return value
1566 * are as for raw_notifier_call_chain().
1569 int call_netdevice_notifiers_info(unsigned long val
, 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
);
1576 EXPORT_SYMBOL(call_netdevice_notifiers_info
);
1579 * call_netdevice_notifiers - call all network notifier blocks
1580 * @val: value passed unmodified to notifier function
1581 * @dev: net_device pointer passed unmodified to notifier function
1583 * Call all network notifier blocks. Parameters and return value
1584 * are as for raw_notifier_call_chain().
1587 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1589 struct netdev_notifier_info info
;
1591 return call_netdevice_notifiers_info(val
, dev
, &info
);
1593 EXPORT_SYMBOL(call_netdevice_notifiers
);
1595 static struct static_key netstamp_needed __read_mostly
;
1596 #ifdef HAVE_JUMP_LABEL
1597 /* We are not allowed to call static_key_slow_dec() from irq context
1598 * If net_disable_timestamp() is called from irq context, defer the
1599 * static_key_slow_dec() calls.
1601 static atomic_t netstamp_needed_deferred
;
1604 void net_enable_timestamp(void)
1606 #ifdef HAVE_JUMP_LABEL
1607 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1611 static_key_slow_dec(&netstamp_needed
);
1615 static_key_slow_inc(&netstamp_needed
);
1617 EXPORT_SYMBOL(net_enable_timestamp
);
1619 void net_disable_timestamp(void)
1621 #ifdef HAVE_JUMP_LABEL
1622 if (in_interrupt()) {
1623 atomic_inc(&netstamp_needed_deferred
);
1627 static_key_slow_dec(&netstamp_needed
);
1629 EXPORT_SYMBOL(net_disable_timestamp
);
1631 static inline void net_timestamp_set(struct sk_buff
*skb
)
1633 skb
->tstamp
.tv64
= 0;
1634 if (static_key_false(&netstamp_needed
))
1635 __net_timestamp(skb
);
1638 #define net_timestamp_check(COND, SKB) \
1639 if (static_key_false(&netstamp_needed)) { \
1640 if ((COND) && !(SKB)->tstamp.tv64) \
1641 __net_timestamp(SKB); \
1644 static inline bool is_skb_forwardable(struct net_device *dev,
1645 struct sk_buff
*skb
)
1649 if (!(dev
->flags
& IFF_UP
))
1652 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1653 if (skb
->len
<= len
)
1656 /* if TSO is enabled, we don't care about the length as the packet
1657 * could be forwarded without being segmented before
1659 if (skb_is_gso(skb
))
1666 * dev_forward_skb - loopback an skb to another netif
1668 * @dev: destination network device
1669 * @skb: buffer to forward
1672 * NET_RX_SUCCESS (no congestion)
1673 * NET_RX_DROP (packet was dropped, but freed)
1675 * dev_forward_skb can be used for injecting an skb from the
1676 * start_xmit function of one device into the receive queue
1677 * of another device.
1679 * The receiving device may be in another namespace, so
1680 * we have to clear all information in the skb that could
1681 * impact namespace isolation.
1683 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1685 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1686 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1687 atomic_long_inc(&dev
->rx_dropped
);
1693 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1694 atomic_long_inc(&dev
->rx_dropped
);
1699 skb_scrub_packet(skb
, true);
1700 skb
->protocol
= eth_type_trans(skb
, dev
);
1702 return netif_rx(skb
);
1704 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1706 static inline int deliver_skb(struct sk_buff
*skb
,
1707 struct packet_type
*pt_prev
,
1708 struct net_device
*orig_dev
)
1710 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1712 atomic_inc(&skb
->users
);
1713 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1716 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1718 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1721 if (ptype
->id_match
)
1722 return ptype
->id_match(ptype
, skb
->sk
);
1723 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1730 * Support routine. Sends outgoing frames to any network
1731 * taps currently in use.
1734 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1736 struct packet_type
*ptype
;
1737 struct sk_buff
*skb2
= NULL
;
1738 struct packet_type
*pt_prev
= NULL
;
1741 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1742 /* Never send packets back to the socket
1743 * they originated from - MvS (miquels@drinkel.ow.org)
1745 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1746 (!skb_loop_sk(ptype
, skb
))) {
1748 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1753 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1757 net_timestamp_set(skb2
);
1759 /* skb->nh should be correctly
1760 set by sender, so that the second statement is
1761 just protection against buggy protocols.
1763 skb_reset_mac_header(skb2
);
1765 if (skb_network_header(skb2
) < skb2
->data
||
1766 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1767 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1768 ntohs(skb2
->protocol
),
1770 skb_reset_network_header(skb2
);
1773 skb2
->transport_header
= skb2
->network_header
;
1774 skb2
->pkt_type
= PACKET_OUTGOING
;
1779 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1784 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1785 * @dev: Network device
1786 * @txq: number of queues available
1788 * If real_num_tx_queues is changed the tc mappings may no longer be
1789 * valid. To resolve this verify the tc mapping remains valid and if
1790 * not NULL the mapping. With no priorities mapping to this
1791 * offset/count pair it will no longer be used. In the worst case TC0
1792 * is invalid nothing can be done so disable priority mappings. If is
1793 * expected that drivers will fix this mapping if they can before
1794 * calling netif_set_real_num_tx_queues.
1796 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1799 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1801 /* If TC0 is invalidated disable TC mapping */
1802 if (tc
->offset
+ tc
->count
> txq
) {
1803 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1808 /* Invalidated prio to tc mappings set to TC0 */
1809 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1810 int q
= netdev_get_prio_tc_map(dev
, i
);
1812 tc
= &dev
->tc_to_txq
[q
];
1813 if (tc
->offset
+ tc
->count
> txq
) {
1814 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1816 netdev_set_prio_tc_map(dev
, i
, 0);
1822 static DEFINE_MUTEX(xps_map_mutex
);
1823 #define xmap_dereference(P) \
1824 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1826 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1829 struct xps_map
*map
= NULL
;
1833 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1835 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1836 if (map
->queues
[pos
] == index
) {
1838 map
->queues
[pos
] = map
->queues
[--map
->len
];
1840 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1841 kfree_rcu(map
, rcu
);
1851 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1853 struct xps_dev_maps
*dev_maps
;
1855 bool active
= false;
1857 mutex_lock(&xps_map_mutex
);
1858 dev_maps
= xmap_dereference(dev
->xps_maps
);
1863 for_each_possible_cpu(cpu
) {
1864 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1865 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1868 if (i
== dev
->num_tx_queues
)
1873 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1874 kfree_rcu(dev_maps
, rcu
);
1877 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1878 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1882 mutex_unlock(&xps_map_mutex
);
1885 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1888 struct xps_map
*new_map
;
1889 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1892 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1893 if (map
->queues
[pos
] != index
)
1898 /* Need to add queue to this CPU's existing map */
1900 if (pos
< map
->alloc_len
)
1903 alloc_len
= map
->alloc_len
* 2;
1906 /* Need to allocate new map to store queue on this CPU's map */
1907 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1912 for (i
= 0; i
< pos
; i
++)
1913 new_map
->queues
[i
] = map
->queues
[i
];
1914 new_map
->alloc_len
= alloc_len
;
1920 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
1923 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
1924 struct xps_map
*map
, *new_map
;
1925 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
1926 int cpu
, numa_node_id
= -2;
1927 bool active
= false;
1929 mutex_lock(&xps_map_mutex
);
1931 dev_maps
= xmap_dereference(dev
->xps_maps
);
1933 /* allocate memory for queue storage */
1934 for_each_online_cpu(cpu
) {
1935 if (!cpumask_test_cpu(cpu
, mask
))
1939 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
1940 if (!new_dev_maps
) {
1941 mutex_unlock(&xps_map_mutex
);
1945 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1948 map
= expand_xps_map(map
, cpu
, index
);
1952 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1956 goto out_no_new_maps
;
1958 for_each_possible_cpu(cpu
) {
1959 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
1960 /* add queue to CPU maps */
1963 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1964 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
1967 if (pos
== map
->len
)
1968 map
->queues
[map
->len
++] = index
;
1970 if (numa_node_id
== -2)
1971 numa_node_id
= cpu_to_node(cpu
);
1972 else if (numa_node_id
!= cpu_to_node(cpu
))
1975 } else if (dev_maps
) {
1976 /* fill in the new device map from the old device map */
1977 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1978 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1983 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
1985 /* Cleanup old maps */
1987 for_each_possible_cpu(cpu
) {
1988 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1989 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1990 if (map
&& map
!= new_map
)
1991 kfree_rcu(map
, rcu
);
1994 kfree_rcu(dev_maps
, rcu
);
1997 dev_maps
= new_dev_maps
;
2001 /* update Tx queue numa node */
2002 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2003 (numa_node_id
>= 0) ? numa_node_id
:
2009 /* removes queue from unused CPUs */
2010 for_each_possible_cpu(cpu
) {
2011 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2014 if (remove_xps_queue(dev_maps
, cpu
, index
))
2018 /* free map if not active */
2020 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2021 kfree_rcu(dev_maps
, rcu
);
2025 mutex_unlock(&xps_map_mutex
);
2029 /* remove any maps that we added */
2030 for_each_possible_cpu(cpu
) {
2031 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2032 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2034 if (new_map
&& new_map
!= map
)
2038 mutex_unlock(&xps_map_mutex
);
2040 kfree(new_dev_maps
);
2043 EXPORT_SYMBOL(netif_set_xps_queue
);
2047 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2048 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2050 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2054 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2057 if (dev
->reg_state
== NETREG_REGISTERED
||
2058 dev
->reg_state
== NETREG_UNREGISTERING
) {
2061 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2067 netif_setup_tc(dev
, txq
);
2069 if (txq
< dev
->real_num_tx_queues
) {
2070 qdisc_reset_all_tx_gt(dev
, txq
);
2072 netif_reset_xps_queues_gt(dev
, txq
);
2077 dev
->real_num_tx_queues
= txq
;
2080 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2084 * netif_set_real_num_rx_queues - set actual number of RX queues used
2085 * @dev: Network device
2086 * @rxq: Actual number of RX queues
2088 * This must be called either with the rtnl_lock held or before
2089 * registration of the net device. Returns 0 on success, or a
2090 * negative error code. If called before registration, it always
2093 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2097 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2100 if (dev
->reg_state
== NETREG_REGISTERED
) {
2103 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2109 dev
->real_num_rx_queues
= rxq
;
2112 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2116 * netif_get_num_default_rss_queues - default number of RSS queues
2118 * This routine should set an upper limit on the number of RSS queues
2119 * used by default by multiqueue devices.
2121 int netif_get_num_default_rss_queues(void)
2123 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2125 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2127 static inline void __netif_reschedule(struct Qdisc
*q
)
2129 struct softnet_data
*sd
;
2130 unsigned long flags
;
2132 local_irq_save(flags
);
2133 sd
= &__get_cpu_var(softnet_data
);
2134 q
->next_sched
= NULL
;
2135 *sd
->output_queue_tailp
= q
;
2136 sd
->output_queue_tailp
= &q
->next_sched
;
2137 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2138 local_irq_restore(flags
);
2141 void __netif_schedule(struct Qdisc
*q
)
2143 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2144 __netif_reschedule(q
);
2146 EXPORT_SYMBOL(__netif_schedule
);
2148 struct dev_kfree_skb_cb
{
2149 enum skb_free_reason reason
;
2152 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2154 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2157 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2159 unsigned long flags
;
2161 if (likely(atomic_read(&skb
->users
) == 1)) {
2163 atomic_set(&skb
->users
, 0);
2164 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2167 get_kfree_skb_cb(skb
)->reason
= reason
;
2168 local_irq_save(flags
);
2169 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2170 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2171 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2172 local_irq_restore(flags
);
2174 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2176 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2178 if (in_irq() || irqs_disabled())
2179 __dev_kfree_skb_irq(skb
, reason
);
2183 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2187 * netif_device_detach - mark device as removed
2188 * @dev: network device
2190 * Mark device as removed from system and therefore no longer available.
2192 void netif_device_detach(struct net_device
*dev
)
2194 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2195 netif_running(dev
)) {
2196 netif_tx_stop_all_queues(dev
);
2199 EXPORT_SYMBOL(netif_device_detach
);
2202 * netif_device_attach - mark device as attached
2203 * @dev: network device
2205 * Mark device as attached from system and restart if needed.
2207 void netif_device_attach(struct net_device
*dev
)
2209 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2210 netif_running(dev
)) {
2211 netif_tx_wake_all_queues(dev
);
2212 __netdev_watchdog_up(dev
);
2215 EXPORT_SYMBOL(netif_device_attach
);
2217 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2219 static const netdev_features_t null_features
= 0;
2220 struct net_device
*dev
= skb
->dev
;
2221 const char *driver
= "";
2223 if (!net_ratelimit())
2226 if (dev
&& dev
->dev
.parent
)
2227 driver
= dev_driver_string(dev
->dev
.parent
);
2229 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2230 "gso_type=%d ip_summed=%d\n",
2231 driver
, dev
? &dev
->features
: &null_features
,
2232 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2233 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2234 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2238 * Invalidate hardware checksum when packet is to be mangled, and
2239 * complete checksum manually on outgoing path.
2241 int skb_checksum_help(struct sk_buff
*skb
)
2244 int ret
= 0, offset
;
2246 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2247 goto out_set_summed
;
2249 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2250 skb_warn_bad_offload(skb
);
2254 /* Before computing a checksum, we should make sure no frag could
2255 * be modified by an external entity : checksum could be wrong.
2257 if (skb_has_shared_frag(skb
)) {
2258 ret
= __skb_linearize(skb
);
2263 offset
= skb_checksum_start_offset(skb
);
2264 BUG_ON(offset
>= skb_headlen(skb
));
2265 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2267 offset
+= skb
->csum_offset
;
2268 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2270 if (skb_cloned(skb
) &&
2271 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2272 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2277 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2279 skb
->ip_summed
= CHECKSUM_NONE
;
2283 EXPORT_SYMBOL(skb_checksum_help
);
2285 __be16
skb_network_protocol(struct sk_buff
*skb
)
2287 __be16 type
= skb
->protocol
;
2288 int vlan_depth
= ETH_HLEN
;
2290 /* Tunnel gso handlers can set protocol to ethernet. */
2291 if (type
== htons(ETH_P_TEB
)) {
2294 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2297 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2298 type
= eth
->h_proto
;
2301 while (type
== htons(ETH_P_8021Q
) || type
== htons(ETH_P_8021AD
)) {
2302 struct vlan_hdr
*vh
;
2304 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
2307 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
2308 type
= vh
->h_vlan_encapsulated_proto
;
2309 vlan_depth
+= VLAN_HLEN
;
2316 * skb_mac_gso_segment - mac layer segmentation handler.
2317 * @skb: buffer to segment
2318 * @features: features for the output path (see dev->features)
2320 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2321 netdev_features_t features
)
2323 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2324 struct packet_offload
*ptype
;
2325 __be16 type
= skb_network_protocol(skb
);
2327 if (unlikely(!type
))
2328 return ERR_PTR(-EINVAL
);
2330 __skb_pull(skb
, skb
->mac_len
);
2333 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2334 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2335 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2338 err
= ptype
->callbacks
.gso_send_check(skb
);
2339 segs
= ERR_PTR(err
);
2340 if (err
|| skb_gso_ok(skb
, features
))
2342 __skb_push(skb
, (skb
->data
-
2343 skb_network_header(skb
)));
2345 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2351 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2355 EXPORT_SYMBOL(skb_mac_gso_segment
);
2358 /* openvswitch calls this on rx path, so we need a different check.
2360 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2363 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2365 return skb
->ip_summed
== CHECKSUM_NONE
;
2369 * __skb_gso_segment - Perform segmentation on skb.
2370 * @skb: buffer to segment
2371 * @features: features for the output path (see dev->features)
2372 * @tx_path: whether it is called in TX path
2374 * This function segments the given skb and returns a list of segments.
2376 * It may return NULL if the skb requires no segmentation. This is
2377 * only possible when GSO is used for verifying header integrity.
2379 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2380 netdev_features_t features
, bool tx_path
)
2382 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2385 skb_warn_bad_offload(skb
);
2387 if (skb_header_cloned(skb
) &&
2388 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
2389 return ERR_PTR(err
);
2392 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2393 SKB_GSO_CB(skb
)->encap_level
= 0;
2395 skb_reset_mac_header(skb
);
2396 skb_reset_mac_len(skb
);
2398 return skb_mac_gso_segment(skb
, features
);
2400 EXPORT_SYMBOL(__skb_gso_segment
);
2402 /* Take action when hardware reception checksum errors are detected. */
2404 void netdev_rx_csum_fault(struct net_device
*dev
)
2406 if (net_ratelimit()) {
2407 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2411 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2414 /* Actually, we should eliminate this check as soon as we know, that:
2415 * 1. IOMMU is present and allows to map all the memory.
2416 * 2. No high memory really exists on this machine.
2419 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2421 #ifdef CONFIG_HIGHMEM
2423 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2424 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2425 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2426 if (PageHighMem(skb_frag_page(frag
)))
2431 if (PCI_DMA_BUS_IS_PHYS
) {
2432 struct device
*pdev
= dev
->dev
.parent
;
2436 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2437 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2438 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2439 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2448 void (*destructor
)(struct sk_buff
*skb
);
2451 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2453 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2455 struct dev_gso_cb
*cb
;
2458 struct sk_buff
*nskb
= skb
->next
;
2460 skb
->next
= nskb
->next
;
2463 } while (skb
->next
);
2465 cb
= DEV_GSO_CB(skb
);
2467 cb
->destructor(skb
);
2471 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2472 * @skb: buffer to segment
2473 * @features: device features as applicable to this skb
2475 * This function segments the given skb and stores the list of segments
2478 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2480 struct sk_buff
*segs
;
2482 segs
= skb_gso_segment(skb
, features
);
2484 /* Verifying header integrity only. */
2489 return PTR_ERR(segs
);
2492 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2493 skb
->destructor
= dev_gso_skb_destructor
;
2498 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2499 netdev_features_t features
)
2501 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2502 !can_checksum_protocol(features
, skb_network_protocol(skb
))) {
2503 features
&= ~NETIF_F_ALL_CSUM
;
2504 } else if (illegal_highdma(skb
->dev
, skb
)) {
2505 features
&= ~NETIF_F_SG
;
2511 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2513 __be16 protocol
= skb
->protocol
;
2514 netdev_features_t features
= skb
->dev
->features
;
2516 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2517 features
&= ~NETIF_F_GSO_MASK
;
2519 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
)) {
2520 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2521 protocol
= veh
->h_vlan_encapsulated_proto
;
2522 } else if (!vlan_tx_tag_present(skb
)) {
2523 return harmonize_features(skb
, features
);
2526 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_CTAG_TX
|
2527 NETIF_F_HW_VLAN_STAG_TX
);
2529 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
))
2530 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2531 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_CTAG_TX
|
2532 NETIF_F_HW_VLAN_STAG_TX
;
2534 return harmonize_features(skb
, features
);
2536 EXPORT_SYMBOL(netif_skb_features
);
2538 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2539 struct netdev_queue
*txq
, void *accel_priv
)
2541 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2542 int rc
= NETDEV_TX_OK
;
2543 unsigned int skb_len
;
2545 if (likely(!skb
->next
)) {
2546 netdev_features_t features
;
2549 * If device doesn't need skb->dst, release it right now while
2550 * its hot in this cpu cache
2552 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2555 features
= netif_skb_features(skb
);
2557 if (vlan_tx_tag_present(skb
) &&
2558 !vlan_hw_offload_capable(features
, skb
->vlan_proto
)) {
2559 skb
= __vlan_put_tag(skb
, skb
->vlan_proto
,
2560 vlan_tx_tag_get(skb
));
2567 /* If encapsulation offload request, verify we are testing
2568 * hardware encapsulation features instead of standard
2569 * features for the netdev
2571 if (skb
->encapsulation
)
2572 features
&= dev
->hw_enc_features
;
2574 if (netif_needs_gso(skb
, features
)) {
2575 if (unlikely(dev_gso_segment(skb
, features
)))
2580 if (skb_needs_linearize(skb
, features
) &&
2581 __skb_linearize(skb
))
2584 /* If packet is not checksummed and device does not
2585 * support checksumming for this protocol, complete
2586 * checksumming here.
2588 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2589 if (skb
->encapsulation
)
2590 skb_set_inner_transport_header(skb
,
2591 skb_checksum_start_offset(skb
));
2593 skb_set_transport_header(skb
,
2594 skb_checksum_start_offset(skb
));
2595 if (!(features
& NETIF_F_ALL_CSUM
) &&
2596 skb_checksum_help(skb
))
2601 if (!list_empty(&ptype_all
))
2602 dev_queue_xmit_nit(skb
, dev
);
2606 rc
= ops
->ndo_dfwd_start_xmit(skb
, dev
, accel_priv
);
2608 rc
= ops
->ndo_start_xmit(skb
, dev
);
2610 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2611 if (rc
== NETDEV_TX_OK
&& txq
)
2612 txq_trans_update(txq
);
2618 struct sk_buff
*nskb
= skb
->next
;
2620 skb
->next
= nskb
->next
;
2623 if (!list_empty(&ptype_all
))
2624 dev_queue_xmit_nit(nskb
, dev
);
2626 skb_len
= nskb
->len
;
2628 rc
= ops
->ndo_dfwd_start_xmit(nskb
, dev
, accel_priv
);
2630 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2631 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2632 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2633 if (rc
& ~NETDEV_TX_MASK
)
2634 goto out_kfree_gso_skb
;
2635 nskb
->next
= skb
->next
;
2639 txq_trans_update(txq
);
2640 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2641 return NETDEV_TX_BUSY
;
2642 } while (skb
->next
);
2645 if (likely(skb
->next
== NULL
)) {
2646 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2655 EXPORT_SYMBOL_GPL(dev_hard_start_xmit
);
2657 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2659 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2661 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2663 /* To get more precise estimation of bytes sent on wire,
2664 * we add to pkt_len the headers size of all segments
2666 if (shinfo
->gso_size
) {
2667 unsigned int hdr_len
;
2668 u16 gso_segs
= shinfo
->gso_segs
;
2670 /* mac layer + network layer */
2671 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2673 /* + transport layer */
2674 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2675 hdr_len
+= tcp_hdrlen(skb
);
2677 hdr_len
+= sizeof(struct udphdr
);
2679 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2680 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2683 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2687 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2688 struct net_device
*dev
,
2689 struct netdev_queue
*txq
)
2691 spinlock_t
*root_lock
= qdisc_lock(q
);
2695 qdisc_pkt_len_init(skb
);
2696 qdisc_calculate_pkt_len(skb
, q
);
2698 * Heuristic to force contended enqueues to serialize on a
2699 * separate lock before trying to get qdisc main lock.
2700 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2701 * and dequeue packets faster.
2703 contended
= qdisc_is_running(q
);
2704 if (unlikely(contended
))
2705 spin_lock(&q
->busylock
);
2707 spin_lock(root_lock
);
2708 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2711 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2712 qdisc_run_begin(q
)) {
2714 * This is a work-conserving queue; there are no old skbs
2715 * waiting to be sent out; and the qdisc is not running -
2716 * xmit the skb directly.
2718 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2721 qdisc_bstats_update(q
, skb
);
2723 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2724 if (unlikely(contended
)) {
2725 spin_unlock(&q
->busylock
);
2732 rc
= NET_XMIT_SUCCESS
;
2735 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2736 if (qdisc_run_begin(q
)) {
2737 if (unlikely(contended
)) {
2738 spin_unlock(&q
->busylock
);
2744 spin_unlock(root_lock
);
2745 if (unlikely(contended
))
2746 spin_unlock(&q
->busylock
);
2750 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2751 static void skb_update_prio(struct sk_buff
*skb
)
2753 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2755 if (!skb
->priority
&& skb
->sk
&& map
) {
2756 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2758 if (prioidx
< map
->priomap_len
)
2759 skb
->priority
= map
->priomap
[prioidx
];
2763 #define skb_update_prio(skb)
2766 static DEFINE_PER_CPU(int, xmit_recursion
);
2767 #define RECURSION_LIMIT 10
2770 * dev_loopback_xmit - loop back @skb
2771 * @skb: buffer to transmit
2773 int dev_loopback_xmit(struct sk_buff
*skb
)
2775 skb_reset_mac_header(skb
);
2776 __skb_pull(skb
, skb_network_offset(skb
));
2777 skb
->pkt_type
= PACKET_LOOPBACK
;
2778 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2779 WARN_ON(!skb_dst(skb
));
2784 EXPORT_SYMBOL(dev_loopback_xmit
);
2787 * dev_queue_xmit - transmit a buffer
2788 * @skb: buffer to transmit
2790 * Queue a buffer for transmission to a network device. The caller must
2791 * have set the device and priority and built the buffer before calling
2792 * this function. The function can be called from an interrupt.
2794 * A negative errno code is returned on a failure. A success does not
2795 * guarantee the frame will be transmitted as it may be dropped due
2796 * to congestion or traffic shaping.
2798 * -----------------------------------------------------------------------------------
2799 * I notice this method can also return errors from the queue disciplines,
2800 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2803 * Regardless of the return value, the skb is consumed, so it is currently
2804 * difficult to retry a send to this method. (You can bump the ref count
2805 * before sending to hold a reference for retry if you are careful.)
2807 * When calling this method, interrupts MUST be enabled. This is because
2808 * the BH enable code must have IRQs enabled so that it will not deadlock.
2811 int dev_queue_xmit(struct sk_buff
*skb
)
2813 struct net_device
*dev
= skb
->dev
;
2814 struct netdev_queue
*txq
;
2818 skb_reset_mac_header(skb
);
2820 /* Disable soft irqs for various locks below. Also
2821 * stops preemption for RCU.
2825 skb_update_prio(skb
);
2827 txq
= netdev_pick_tx(dev
, skb
);
2828 q
= rcu_dereference_bh(txq
->qdisc
);
2830 #ifdef CONFIG_NET_CLS_ACT
2831 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2833 trace_net_dev_queue(skb
);
2835 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2839 /* The device has no queue. Common case for software devices:
2840 loopback, all the sorts of tunnels...
2842 Really, it is unlikely that netif_tx_lock protection is necessary
2843 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2845 However, it is possible, that they rely on protection
2848 Check this and shot the lock. It is not prone from deadlocks.
2849 Either shot noqueue qdisc, it is even simpler 8)
2851 if (dev
->flags
& IFF_UP
) {
2852 int cpu
= smp_processor_id(); /* ok because BHs are off */
2854 if (txq
->xmit_lock_owner
!= cpu
) {
2856 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2857 goto recursion_alert
;
2859 HARD_TX_LOCK(dev
, txq
, cpu
);
2861 if (!netif_xmit_stopped(txq
)) {
2862 __this_cpu_inc(xmit_recursion
);
2863 rc
= dev_hard_start_xmit(skb
, dev
, txq
, NULL
);
2864 __this_cpu_dec(xmit_recursion
);
2865 if (dev_xmit_complete(rc
)) {
2866 HARD_TX_UNLOCK(dev
, txq
);
2870 HARD_TX_UNLOCK(dev
, txq
);
2871 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2874 /* Recursion is detected! It is possible,
2878 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2884 rcu_read_unlock_bh();
2889 rcu_read_unlock_bh();
2892 EXPORT_SYMBOL(dev_queue_xmit
);
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_rxhash(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_rxhash(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
);
3857 list_for_each_entry_rcu(ptype
, head
, list
) {
3858 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
3861 skb_set_network_header(skb
, skb_gro_offset(skb
));
3862 skb_reset_mac_len(skb
);
3863 NAPI_GRO_CB(skb
)->same_flow
= 0;
3864 NAPI_GRO_CB(skb
)->flush
= 0;
3865 NAPI_GRO_CB(skb
)->free
= 0;
3867 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
3872 if (&ptype
->list
== head
)
3875 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3876 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3879 struct sk_buff
*nskb
= *pp
;
3883 napi_gro_complete(nskb
);
3890 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3894 NAPI_GRO_CB(skb
)->count
= 1;
3895 NAPI_GRO_CB(skb
)->age
= jiffies
;
3896 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3897 skb
->next
= napi
->gro_list
;
3898 napi
->gro_list
= skb
;
3902 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3903 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3905 BUG_ON(skb
->end
- skb
->tail
< grow
);
3907 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3910 skb
->data_len
-= grow
;
3912 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3913 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3915 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3916 skb_frag_unref(skb
, 0);
3917 memmove(skb_shinfo(skb
)->frags
,
3918 skb_shinfo(skb
)->frags
+ 1,
3919 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3932 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3936 if (netif_receive_skb(skb
))
3944 case GRO_MERGED_FREE
:
3945 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3946 kmem_cache_free(skbuff_head_cache
, skb
);
3959 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3961 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
3963 EXPORT_SYMBOL(napi_gro_receive
);
3965 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3967 __skb_pull(skb
, skb_headlen(skb
));
3968 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3969 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
3971 skb
->dev
= napi
->dev
;
3977 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3979 struct sk_buff
*skb
= napi
->skb
;
3982 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3987 EXPORT_SYMBOL(napi_get_frags
);
3989 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3994 if (netif_receive_skb(skb
))
3999 case GRO_MERGED_FREE
:
4000 napi_reuse_skb(napi
, skb
);
4011 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4013 struct sk_buff
*skb
= napi
->skb
;
4017 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
)))) {
4018 napi_reuse_skb(napi
, skb
);
4021 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4026 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4028 struct sk_buff
*skb
= napi_frags_skb(napi
);
4033 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4035 EXPORT_SYMBOL(napi_gro_frags
);
4038 * net_rps_action sends any pending IPI's for rps.
4039 * Note: called with local irq disabled, but exits with local irq enabled.
4041 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4044 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4047 sd
->rps_ipi_list
= NULL
;
4051 /* Send pending IPI's to kick RPS processing on remote cpus. */
4053 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4055 if (cpu_online(remsd
->cpu
))
4056 __smp_call_function_single(remsd
->cpu
,
4065 static int process_backlog(struct napi_struct
*napi
, int quota
)
4068 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4071 /* Check if we have pending ipi, its better to send them now,
4072 * not waiting net_rx_action() end.
4074 if (sd
->rps_ipi_list
) {
4075 local_irq_disable();
4076 net_rps_action_and_irq_enable(sd
);
4079 napi
->weight
= weight_p
;
4080 local_irq_disable();
4081 while (work
< quota
) {
4082 struct sk_buff
*skb
;
4085 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4087 __netif_receive_skb(skb
);
4088 local_irq_disable();
4089 input_queue_head_incr(sd
);
4090 if (++work
>= quota
) {
4097 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
4099 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4100 &sd
->process_queue
);
4102 if (qlen
< quota
- work
) {
4104 * Inline a custom version of __napi_complete().
4105 * only current cpu owns and manipulates this napi,
4106 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
4107 * we can use a plain write instead of clear_bit(),
4108 * and we dont need an smp_mb() memory barrier.
4110 list_del(&napi
->poll_list
);
4113 quota
= work
+ qlen
;
4123 * __napi_schedule - schedule for receive
4124 * @n: entry to schedule
4126 * The entry's receive function will be scheduled to run
4128 void __napi_schedule(struct napi_struct
*n
)
4130 unsigned long flags
;
4132 local_irq_save(flags
);
4133 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
4134 local_irq_restore(flags
);
4136 EXPORT_SYMBOL(__napi_schedule
);
4138 void __napi_complete(struct napi_struct
*n
)
4140 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4141 BUG_ON(n
->gro_list
);
4143 list_del(&n
->poll_list
);
4144 smp_mb__before_clear_bit();
4145 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4147 EXPORT_SYMBOL(__napi_complete
);
4149 void napi_complete(struct napi_struct
*n
)
4151 unsigned long flags
;
4154 * don't let napi dequeue from the cpu poll list
4155 * just in case its running on a different cpu
4157 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4160 napi_gro_flush(n
, false);
4161 local_irq_save(flags
);
4163 local_irq_restore(flags
);
4165 EXPORT_SYMBOL(napi_complete
);
4167 /* must be called under rcu_read_lock(), as we dont take a reference */
4168 struct napi_struct
*napi_by_id(unsigned int napi_id
)
4170 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4171 struct napi_struct
*napi
;
4173 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4174 if (napi
->napi_id
== napi_id
)
4179 EXPORT_SYMBOL_GPL(napi_by_id
);
4181 void napi_hash_add(struct napi_struct
*napi
)
4183 if (!test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
4185 spin_lock(&napi_hash_lock
);
4187 /* 0 is not a valid id, we also skip an id that is taken
4188 * we expect both events to be extremely rare
4191 while (!napi
->napi_id
) {
4192 napi
->napi_id
= ++napi_gen_id
;
4193 if (napi_by_id(napi
->napi_id
))
4197 hlist_add_head_rcu(&napi
->napi_hash_node
,
4198 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
4200 spin_unlock(&napi_hash_lock
);
4203 EXPORT_SYMBOL_GPL(napi_hash_add
);
4205 /* Warning : caller is responsible to make sure rcu grace period
4206 * is respected before freeing memory containing @napi
4208 void napi_hash_del(struct napi_struct
*napi
)
4210 spin_lock(&napi_hash_lock
);
4212 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
))
4213 hlist_del_rcu(&napi
->napi_hash_node
);
4215 spin_unlock(&napi_hash_lock
);
4217 EXPORT_SYMBOL_GPL(napi_hash_del
);
4219 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4220 int (*poll
)(struct napi_struct
*, int), int weight
)
4222 INIT_LIST_HEAD(&napi
->poll_list
);
4223 napi
->gro_count
= 0;
4224 napi
->gro_list
= NULL
;
4227 if (weight
> NAPI_POLL_WEIGHT
)
4228 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4230 napi
->weight
= weight
;
4231 list_add(&napi
->dev_list
, &dev
->napi_list
);
4233 #ifdef CONFIG_NETPOLL
4234 spin_lock_init(&napi
->poll_lock
);
4235 napi
->poll_owner
= -1;
4237 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4239 EXPORT_SYMBOL(netif_napi_add
);
4241 void netif_napi_del(struct napi_struct
*napi
)
4243 struct sk_buff
*skb
, *next
;
4245 list_del_init(&napi
->dev_list
);
4246 napi_free_frags(napi
);
4248 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
4254 napi
->gro_list
= NULL
;
4255 napi
->gro_count
= 0;
4257 EXPORT_SYMBOL(netif_napi_del
);
4259 static void net_rx_action(struct softirq_action
*h
)
4261 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
4262 unsigned long time_limit
= jiffies
+ 2;
4263 int budget
= netdev_budget
;
4266 local_irq_disable();
4268 while (!list_empty(&sd
->poll_list
)) {
4269 struct napi_struct
*n
;
4272 /* If softirq window is exhuasted then punt.
4273 * Allow this to run for 2 jiffies since which will allow
4274 * an average latency of 1.5/HZ.
4276 if (unlikely(budget
<= 0 || time_after_eq(jiffies
, time_limit
)))
4281 /* Even though interrupts have been re-enabled, this
4282 * access is safe because interrupts can only add new
4283 * entries to the tail of this list, and only ->poll()
4284 * calls can remove this head entry from the list.
4286 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
4288 have
= netpoll_poll_lock(n
);
4292 /* This NAPI_STATE_SCHED test is for avoiding a race
4293 * with netpoll's poll_napi(). Only the entity which
4294 * obtains the lock and sees NAPI_STATE_SCHED set will
4295 * actually make the ->poll() call. Therefore we avoid
4296 * accidentally calling ->poll() when NAPI is not scheduled.
4299 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4300 work
= n
->poll(n
, weight
);
4304 WARN_ON_ONCE(work
> weight
);
4308 local_irq_disable();
4310 /* Drivers must not modify the NAPI state if they
4311 * consume the entire weight. In such cases this code
4312 * still "owns" the NAPI instance and therefore can
4313 * move the instance around on the list at-will.
4315 if (unlikely(work
== weight
)) {
4316 if (unlikely(napi_disable_pending(n
))) {
4319 local_irq_disable();
4322 /* flush too old packets
4323 * If HZ < 1000, flush all packets.
4326 napi_gro_flush(n
, HZ
>= 1000);
4327 local_irq_disable();
4329 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
4333 netpoll_poll_unlock(have
);
4336 net_rps_action_and_irq_enable(sd
);
4338 #ifdef CONFIG_NET_DMA
4340 * There may not be any more sk_buffs coming right now, so push
4341 * any pending DMA copies to hardware
4343 dma_issue_pending_all();
4350 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4354 struct netdev_adjacent
{
4355 struct net_device
*dev
;
4357 /* upper master flag, there can only be one master device per list */
4360 /* counter for the number of times this device was added to us */
4363 /* private field for the users */
4366 struct list_head list
;
4367 struct rcu_head rcu
;
4370 static struct netdev_adjacent
*__netdev_find_adj_rcu(struct net_device
*dev
,
4371 struct net_device
*adj_dev
,
4372 struct list_head
*adj_list
)
4374 struct netdev_adjacent
*adj
;
4376 list_for_each_entry_rcu(adj
, adj_list
, list
) {
4377 if (adj
->dev
== adj_dev
)
4383 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*dev
,
4384 struct net_device
*adj_dev
,
4385 struct list_head
*adj_list
)
4387 struct netdev_adjacent
*adj
;
4389 list_for_each_entry(adj
, adj_list
, list
) {
4390 if (adj
->dev
== adj_dev
)
4397 * netdev_has_upper_dev - Check if device is linked to an upper device
4399 * @upper_dev: upper device to check
4401 * Find out if a device is linked to specified upper device and return true
4402 * in case it is. Note that this checks only immediate upper device,
4403 * not through a complete stack of devices. The caller must hold the RTNL lock.
4405 bool netdev_has_upper_dev(struct net_device
*dev
,
4406 struct net_device
*upper_dev
)
4410 return __netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
);
4412 EXPORT_SYMBOL(netdev_has_upper_dev
);
4415 * netdev_has_any_upper_dev - Check if device is linked to some device
4418 * Find out if a device is linked to an upper device and return true in case
4419 * it is. The caller must hold the RTNL lock.
4421 bool netdev_has_any_upper_dev(struct net_device
*dev
)
4425 return !list_empty(&dev
->all_adj_list
.upper
);
4427 EXPORT_SYMBOL(netdev_has_any_upper_dev
);
4430 * netdev_master_upper_dev_get - Get master upper device
4433 * Find a master upper device and return pointer to it or NULL in case
4434 * it's not there. The caller must hold the RTNL lock.
4436 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4438 struct netdev_adjacent
*upper
;
4442 if (list_empty(&dev
->adj_list
.upper
))
4445 upper
= list_first_entry(&dev
->adj_list
.upper
,
4446 struct netdev_adjacent
, list
);
4447 if (likely(upper
->master
))
4451 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4453 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
4455 struct netdev_adjacent
*adj
;
4457 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
4459 return adj
->private;
4461 EXPORT_SYMBOL(netdev_adjacent_get_private
);
4464 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4466 * @iter: list_head ** of the current position
4468 * Gets the next device from the dev's upper list, starting from iter
4469 * position. The caller must hold RCU read lock.
4471 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
4472 struct list_head
**iter
)
4474 struct netdev_adjacent
*upper
;
4476 WARN_ON_ONCE(!rcu_read_lock_held());
4478 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4480 if (&upper
->list
== &dev
->all_adj_list
.upper
)
4483 *iter
= &upper
->list
;
4487 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
4490 * netdev_lower_get_next_private - Get the next ->private from the
4491 * lower neighbour list
4493 * @iter: list_head ** of the current position
4495 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4496 * list, starting from iter position. The caller must hold either hold the
4497 * RTNL lock or its own locking that guarantees that the neighbour lower
4498 * list will remain unchainged.
4500 void *netdev_lower_get_next_private(struct net_device
*dev
,
4501 struct list_head
**iter
)
4503 struct netdev_adjacent
*lower
;
4505 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
4507 if (&lower
->list
== &dev
->adj_list
.lower
)
4511 *iter
= lower
->list
.next
;
4513 return lower
->private;
4515 EXPORT_SYMBOL(netdev_lower_get_next_private
);
4518 * netdev_lower_get_next_private_rcu - Get the next ->private from the
4519 * lower neighbour list, RCU
4522 * @iter: list_head ** of the current position
4524 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4525 * list, starting from iter position. The caller must hold RCU read lock.
4527 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
4528 struct list_head
**iter
)
4530 struct netdev_adjacent
*lower
;
4532 WARN_ON_ONCE(!rcu_read_lock_held());
4534 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4536 if (&lower
->list
== &dev
->adj_list
.lower
)
4540 *iter
= &lower
->list
;
4542 return lower
->private;
4544 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
4547 * netdev_master_upper_dev_get_rcu - Get master upper device
4550 * Find a master upper device and return pointer to it or NULL in case
4551 * it's not there. The caller must hold the RCU read lock.
4553 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
4555 struct netdev_adjacent
*upper
;
4557 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
4558 struct netdev_adjacent
, list
);
4559 if (upper
&& likely(upper
->master
))
4563 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
4565 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
4566 struct net_device
*adj_dev
,
4567 struct list_head
*dev_list
,
4568 void *private, bool master
)
4570 struct netdev_adjacent
*adj
;
4571 char linkname
[IFNAMSIZ
+7];
4574 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
4581 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
4586 adj
->master
= master
;
4588 adj
->private = private;
4591 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
4592 adj_dev
->name
, dev
->name
, adj_dev
->name
);
4594 if (dev_list
== &dev
->adj_list
.lower
) {
4595 sprintf(linkname
, "lower_%s", adj_dev
->name
);
4596 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
4597 &(adj_dev
->dev
.kobj
), linkname
);
4600 } else if (dev_list
== &dev
->adj_list
.upper
) {
4601 sprintf(linkname
, "upper_%s", adj_dev
->name
);
4602 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
4603 &(adj_dev
->dev
.kobj
), linkname
);
4608 /* Ensure that master link is always the first item in list. */
4610 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
4611 &(adj_dev
->dev
.kobj
), "master");
4613 goto remove_symlinks
;
4615 list_add_rcu(&adj
->list
, dev_list
);
4617 list_add_tail_rcu(&adj
->list
, dev_list
);
4623 if (dev_list
== &dev
->adj_list
.lower
) {
4624 sprintf(linkname
, "lower_%s", adj_dev
->name
);
4625 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4626 } else if (dev_list
== &dev
->adj_list
.upper
) {
4627 sprintf(linkname
, "upper_%s", adj_dev
->name
);
4628 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4638 void __netdev_adjacent_dev_remove(struct net_device
*dev
,
4639 struct net_device
*adj_dev
,
4640 struct list_head
*dev_list
)
4642 struct netdev_adjacent
*adj
;
4643 char linkname
[IFNAMSIZ
+7];
4645 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
4648 pr_err("tried to remove device %s from %s\n",
4649 dev
->name
, adj_dev
->name
);
4653 if (adj
->ref_nr
> 1) {
4654 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
4661 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
4663 if (dev_list
== &dev
->adj_list
.lower
) {
4664 sprintf(linkname
, "lower_%s", adj_dev
->name
);
4665 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4666 } else if (dev_list
== &dev
->adj_list
.upper
) {
4667 sprintf(linkname
, "upper_%s", adj_dev
->name
);
4668 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4671 list_del_rcu(&adj
->list
);
4672 pr_debug("dev_put for %s, because link removed from %s to %s\n",
4673 adj_dev
->name
, dev
->name
, adj_dev
->name
);
4675 kfree_rcu(adj
, rcu
);
4678 int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
4679 struct net_device
*upper_dev
,
4680 struct list_head
*up_list
,
4681 struct list_head
*down_list
,
4682 void *private, bool master
)
4686 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
4691 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
4694 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
4701 int __netdev_adjacent_dev_link(struct net_device
*dev
,
4702 struct net_device
*upper_dev
)
4704 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
4705 &dev
->all_adj_list
.upper
,
4706 &upper_dev
->all_adj_list
.lower
,
4710 void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
4711 struct net_device
*upper_dev
,
4712 struct list_head
*up_list
,
4713 struct list_head
*down_list
)
4715 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
4716 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
4719 void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
4720 struct net_device
*upper_dev
)
4722 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
4723 &dev
->all_adj_list
.upper
,
4724 &upper_dev
->all_adj_list
.lower
);
4727 int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
4728 struct net_device
*upper_dev
,
4729 void *private, bool master
)
4731 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
4736 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
4737 &dev
->adj_list
.upper
,
4738 &upper_dev
->adj_list
.lower
,
4741 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
4748 void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
4749 struct net_device
*upper_dev
)
4751 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
4752 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
4753 &dev
->adj_list
.upper
,
4754 &upper_dev
->adj_list
.lower
);
4757 static int __netdev_upper_dev_link(struct net_device
*dev
,
4758 struct net_device
*upper_dev
, bool master
,
4761 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
4766 if (dev
== upper_dev
)
4769 /* To prevent loops, check if dev is not upper device to upper_dev. */
4770 if (__netdev_find_adj(upper_dev
, dev
, &upper_dev
->all_adj_list
.upper
))
4773 if (__netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
))
4776 if (master
&& netdev_master_upper_dev_get(dev
))
4779 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, private,
4784 /* Now that we linked these devs, make all the upper_dev's
4785 * all_adj_list.upper visible to every dev's all_adj_list.lower an
4786 * versa, and don't forget the devices itself. All of these
4787 * links are non-neighbours.
4789 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
4790 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
4791 pr_debug("Interlinking %s with %s, non-neighbour\n",
4792 i
->dev
->name
, j
->dev
->name
);
4793 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
4799 /* add dev to every upper_dev's upper device */
4800 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
4801 pr_debug("linking %s's upper device %s with %s\n",
4802 upper_dev
->name
, i
->dev
->name
, dev
->name
);
4803 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
4805 goto rollback_upper_mesh
;
4808 /* add upper_dev to every dev's lower device */
4809 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
4810 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
4811 i
->dev
->name
, upper_dev
->name
);
4812 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
4814 goto rollback_lower_mesh
;
4817 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
4820 rollback_lower_mesh
:
4822 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
4825 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
4830 rollback_upper_mesh
:
4832 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
4835 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
4843 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
4844 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
4845 if (i
== to_i
&& j
== to_j
)
4847 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
4853 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
4859 * netdev_upper_dev_link - Add a link to the upper device
4861 * @upper_dev: new upper device
4863 * Adds a link to device which is upper to this one. The caller must hold
4864 * the RTNL lock. On a failure a negative errno code is returned.
4865 * On success the reference counts are adjusted and the function
4868 int netdev_upper_dev_link(struct net_device
*dev
,
4869 struct net_device
*upper_dev
)
4871 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
);
4873 EXPORT_SYMBOL(netdev_upper_dev_link
);
4876 * netdev_master_upper_dev_link - Add a master link to the upper device
4878 * @upper_dev: new upper device
4880 * Adds a link to device which is upper to this one. In this case, only
4881 * one master upper device can be linked, although other non-master devices
4882 * might be linked as well. The caller must hold the RTNL lock.
4883 * On a failure a negative errno code is returned. On success the reference
4884 * counts are adjusted and the function returns zero.
4886 int netdev_master_upper_dev_link(struct net_device
*dev
,
4887 struct net_device
*upper_dev
)
4889 return __netdev_upper_dev_link(dev
, upper_dev
, true, NULL
);
4891 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
4893 int netdev_master_upper_dev_link_private(struct net_device
*dev
,
4894 struct net_device
*upper_dev
,
4897 return __netdev_upper_dev_link(dev
, upper_dev
, true, private);
4899 EXPORT_SYMBOL(netdev_master_upper_dev_link_private
);
4902 * netdev_upper_dev_unlink - Removes a link to upper device
4904 * @upper_dev: new upper device
4906 * Removes a link to device which is upper to this one. The caller must hold
4909 void netdev_upper_dev_unlink(struct net_device
*dev
,
4910 struct net_device
*upper_dev
)
4912 struct netdev_adjacent
*i
, *j
;
4915 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
4917 /* Here is the tricky part. We must remove all dev's lower
4918 * devices from all upper_dev's upper devices and vice
4919 * versa, to maintain the graph relationship.
4921 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
4922 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
4923 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
4925 /* remove also the devices itself from lower/upper device
4928 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
4929 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
4931 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
4932 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
4934 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
4936 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
4938 void *netdev_lower_dev_get_private_rcu(struct net_device
*dev
,
4939 struct net_device
*lower_dev
)
4941 struct netdev_adjacent
*lower
;
4945 lower
= __netdev_find_adj_rcu(dev
, lower_dev
, &dev
->adj_list
.lower
);
4949 return lower
->private;
4951 EXPORT_SYMBOL(netdev_lower_dev_get_private_rcu
);
4953 void *netdev_lower_dev_get_private(struct net_device
*dev
,
4954 struct net_device
*lower_dev
)
4956 struct netdev_adjacent
*lower
;
4960 lower
= __netdev_find_adj(dev
, lower_dev
, &dev
->adj_list
.lower
);
4964 return lower
->private;
4966 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
4968 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4970 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4972 if (ops
->ndo_change_rx_flags
)
4973 ops
->ndo_change_rx_flags(dev
, flags
);
4976 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
4978 unsigned int old_flags
= dev
->flags
;
4984 dev
->flags
|= IFF_PROMISC
;
4985 dev
->promiscuity
+= inc
;
4986 if (dev
->promiscuity
== 0) {
4989 * If inc causes overflow, untouch promisc and return error.
4992 dev
->flags
&= ~IFF_PROMISC
;
4994 dev
->promiscuity
-= inc
;
4995 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5000 if (dev
->flags
!= old_flags
) {
5001 pr_info("device %s %s promiscuous mode\n",
5003 dev
->flags
& IFF_PROMISC
? "entered" : "left");
5004 if (audit_enabled
) {
5005 current_uid_gid(&uid
, &gid
);
5006 audit_log(current
->audit_context
, GFP_ATOMIC
,
5007 AUDIT_ANOM_PROMISCUOUS
,
5008 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5009 dev
->name
, (dev
->flags
& IFF_PROMISC
),
5010 (old_flags
& IFF_PROMISC
),
5011 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
5012 from_kuid(&init_user_ns
, uid
),
5013 from_kgid(&init_user_ns
, gid
),
5014 audit_get_sessionid(current
));
5017 dev_change_rx_flags(dev
, IFF_PROMISC
);
5020 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
5025 * dev_set_promiscuity - update promiscuity count on a device
5029 * Add or remove promiscuity from a device. While the count in the device
5030 * remains above zero the interface remains promiscuous. Once it hits zero
5031 * the device reverts back to normal filtering operation. A negative inc
5032 * value is used to drop promiscuity on the device.
5033 * Return 0 if successful or a negative errno code on error.
5035 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
5037 unsigned int old_flags
= dev
->flags
;
5040 err
= __dev_set_promiscuity(dev
, inc
, true);
5043 if (dev
->flags
!= old_flags
)
5044 dev_set_rx_mode(dev
);
5047 EXPORT_SYMBOL(dev_set_promiscuity
);
5049 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
5051 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5055 dev
->flags
|= IFF_ALLMULTI
;
5056 dev
->allmulti
+= inc
;
5057 if (dev
->allmulti
== 0) {
5060 * If inc causes overflow, untouch allmulti and return error.
5063 dev
->flags
&= ~IFF_ALLMULTI
;
5065 dev
->allmulti
-= inc
;
5066 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5071 if (dev
->flags
^ old_flags
) {
5072 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
5073 dev_set_rx_mode(dev
);
5075 __dev_notify_flags(dev
, old_flags
,
5076 dev
->gflags
^ old_gflags
);
5082 * dev_set_allmulti - update allmulti count on a device
5086 * Add or remove reception of all multicast frames to a device. While the
5087 * count in the device remains above zero the interface remains listening
5088 * to all interfaces. Once it hits zero the device reverts back to normal
5089 * filtering operation. A negative @inc value is used to drop the counter
5090 * when releasing a resource needing all multicasts.
5091 * Return 0 if successful or a negative errno code on error.
5094 int dev_set_allmulti(struct net_device
*dev
, int inc
)
5096 return __dev_set_allmulti(dev
, inc
, true);
5098 EXPORT_SYMBOL(dev_set_allmulti
);
5101 * Upload unicast and multicast address lists to device and
5102 * configure RX filtering. When the device doesn't support unicast
5103 * filtering it is put in promiscuous mode while unicast addresses
5106 void __dev_set_rx_mode(struct net_device
*dev
)
5108 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5110 /* dev_open will call this function so the list will stay sane. */
5111 if (!(dev
->flags
&IFF_UP
))
5114 if (!netif_device_present(dev
))
5117 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
5118 /* Unicast addresses changes may only happen under the rtnl,
5119 * therefore calling __dev_set_promiscuity here is safe.
5121 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
5122 __dev_set_promiscuity(dev
, 1, false);
5123 dev
->uc_promisc
= true;
5124 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
5125 __dev_set_promiscuity(dev
, -1, false);
5126 dev
->uc_promisc
= false;
5130 if (ops
->ndo_set_rx_mode
)
5131 ops
->ndo_set_rx_mode(dev
);
5134 void dev_set_rx_mode(struct net_device
*dev
)
5136 netif_addr_lock_bh(dev
);
5137 __dev_set_rx_mode(dev
);
5138 netif_addr_unlock_bh(dev
);
5142 * dev_get_flags - get flags reported to userspace
5145 * Get the combination of flag bits exported through APIs to userspace.
5147 unsigned int dev_get_flags(const struct net_device
*dev
)
5151 flags
= (dev
->flags
& ~(IFF_PROMISC
|
5156 (dev
->gflags
& (IFF_PROMISC
|
5159 if (netif_running(dev
)) {
5160 if (netif_oper_up(dev
))
5161 flags
|= IFF_RUNNING
;
5162 if (netif_carrier_ok(dev
))
5163 flags
|= IFF_LOWER_UP
;
5164 if (netif_dormant(dev
))
5165 flags
|= IFF_DORMANT
;
5170 EXPORT_SYMBOL(dev_get_flags
);
5172 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5174 unsigned int old_flags
= dev
->flags
;
5180 * Set the flags on our device.
5183 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
5184 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
5186 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
5190 * Load in the correct multicast list now the flags have changed.
5193 if ((old_flags
^ flags
) & IFF_MULTICAST
)
5194 dev_change_rx_flags(dev
, IFF_MULTICAST
);
5196 dev_set_rx_mode(dev
);
5199 * Have we downed the interface. We handle IFF_UP ourselves
5200 * according to user attempts to set it, rather than blindly
5205 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
5206 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
5209 dev_set_rx_mode(dev
);
5212 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
5213 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
5214 unsigned int old_flags
= dev
->flags
;
5216 dev
->gflags
^= IFF_PROMISC
;
5218 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
5219 if (dev
->flags
!= old_flags
)
5220 dev_set_rx_mode(dev
);
5223 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5224 is important. Some (broken) drivers set IFF_PROMISC, when
5225 IFF_ALLMULTI is requested not asking us and not reporting.
5227 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
5228 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
5230 dev
->gflags
^= IFF_ALLMULTI
;
5231 __dev_set_allmulti(dev
, inc
, false);
5237 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
5238 unsigned int gchanges
)
5240 unsigned int changes
= dev
->flags
^ old_flags
;
5243 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
5245 if (changes
& IFF_UP
) {
5246 if (dev
->flags
& IFF_UP
)
5247 call_netdevice_notifiers(NETDEV_UP
, dev
);
5249 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
5252 if (dev
->flags
& IFF_UP
&&
5253 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
5254 struct netdev_notifier_change_info change_info
;
5256 change_info
.flags_changed
= changes
;
5257 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
5263 * dev_change_flags - change device settings
5265 * @flags: device state flags
5267 * Change settings on device based state flags. The flags are
5268 * in the userspace exported format.
5270 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5273 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5275 ret
= __dev_change_flags(dev
, flags
);
5279 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
5280 __dev_notify_flags(dev
, old_flags
, changes
);
5283 EXPORT_SYMBOL(dev_change_flags
);
5286 * dev_set_mtu - Change maximum transfer unit
5288 * @new_mtu: new transfer unit
5290 * Change the maximum transfer size of the network device.
5292 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5294 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5297 if (new_mtu
== dev
->mtu
)
5300 /* MTU must be positive. */
5304 if (!netif_device_present(dev
))
5308 if (ops
->ndo_change_mtu
)
5309 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
5314 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5317 EXPORT_SYMBOL(dev_set_mtu
);
5320 * dev_set_group - Change group this device belongs to
5322 * @new_group: group this device should belong to
5324 void dev_set_group(struct net_device
*dev
, int new_group
)
5326 dev
->group
= new_group
;
5328 EXPORT_SYMBOL(dev_set_group
);
5331 * dev_set_mac_address - Change Media Access Control Address
5335 * Change the hardware (MAC) address of the device
5337 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
5339 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5342 if (!ops
->ndo_set_mac_address
)
5344 if (sa
->sa_family
!= dev
->type
)
5346 if (!netif_device_present(dev
))
5348 err
= ops
->ndo_set_mac_address(dev
, sa
);
5351 dev
->addr_assign_type
= NET_ADDR_SET
;
5352 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
5353 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5356 EXPORT_SYMBOL(dev_set_mac_address
);
5359 * dev_change_carrier - Change device carrier
5361 * @new_carrier: new value
5363 * Change device carrier
5365 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
5367 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5369 if (!ops
->ndo_change_carrier
)
5371 if (!netif_device_present(dev
))
5373 return ops
->ndo_change_carrier(dev
, new_carrier
);
5375 EXPORT_SYMBOL(dev_change_carrier
);
5378 * dev_get_phys_port_id - Get device physical port ID
5382 * Get device physical port ID
5384 int dev_get_phys_port_id(struct net_device
*dev
,
5385 struct netdev_phys_port_id
*ppid
)
5387 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5389 if (!ops
->ndo_get_phys_port_id
)
5391 return ops
->ndo_get_phys_port_id(dev
, ppid
);
5393 EXPORT_SYMBOL(dev_get_phys_port_id
);
5396 * dev_new_index - allocate an ifindex
5397 * @net: the applicable net namespace
5399 * Returns a suitable unique value for a new device interface
5400 * number. The caller must hold the rtnl semaphore or the
5401 * dev_base_lock to be sure it remains unique.
5403 static int dev_new_index(struct net
*net
)
5405 int ifindex
= net
->ifindex
;
5409 if (!__dev_get_by_index(net
, ifindex
))
5410 return net
->ifindex
= ifindex
;
5414 /* Delayed registration/unregisteration */
5415 static LIST_HEAD(net_todo_list
);
5416 static DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
5418 static void net_set_todo(struct net_device
*dev
)
5420 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5421 dev_net(dev
)->dev_unreg_count
++;
5424 static void rollback_registered_many(struct list_head
*head
)
5426 struct net_device
*dev
, *tmp
;
5427 LIST_HEAD(close_head
);
5429 BUG_ON(dev_boot_phase
);
5432 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5433 /* Some devices call without registering
5434 * for initialization unwind. Remove those
5435 * devices and proceed with the remaining.
5437 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5438 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5442 list_del(&dev
->unreg_list
);
5445 dev
->dismantle
= true;
5446 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
5449 /* If device is running, close it first. */
5450 list_for_each_entry(dev
, head
, unreg_list
)
5451 list_add_tail(&dev
->close_list
, &close_head
);
5452 dev_close_many(&close_head
);
5454 list_for_each_entry(dev
, head
, unreg_list
) {
5455 /* And unlink it from device chain. */
5456 unlist_netdevice(dev
);
5458 dev
->reg_state
= NETREG_UNREGISTERING
;
5463 list_for_each_entry(dev
, head
, unreg_list
) {
5464 /* Shutdown queueing discipline. */
5468 /* Notify protocols, that we are about to destroy
5469 this device. They should clean all the things.
5471 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5473 if (!dev
->rtnl_link_ops
||
5474 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5475 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
5478 * Flush the unicast and multicast chains
5483 if (dev
->netdev_ops
->ndo_uninit
)
5484 dev
->netdev_ops
->ndo_uninit(dev
);
5486 /* Notifier chain MUST detach us all upper devices. */
5487 WARN_ON(netdev_has_any_upper_dev(dev
));
5489 /* Remove entries from kobject tree */
5490 netdev_unregister_kobject(dev
);
5492 /* Remove XPS queueing entries */
5493 netif_reset_xps_queues_gt(dev
, 0);
5499 list_for_each_entry(dev
, head
, unreg_list
)
5503 static void rollback_registered(struct net_device
*dev
)
5507 list_add(&dev
->unreg_list
, &single
);
5508 rollback_registered_many(&single
);
5512 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5513 netdev_features_t features
)
5515 /* Fix illegal checksum combinations */
5516 if ((features
& NETIF_F_HW_CSUM
) &&
5517 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5518 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5519 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5522 /* TSO requires that SG is present as well. */
5523 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5524 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5525 features
&= ~NETIF_F_ALL_TSO
;
5528 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
5529 !(features
& NETIF_F_IP_CSUM
)) {
5530 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
5531 features
&= ~NETIF_F_TSO
;
5532 features
&= ~NETIF_F_TSO_ECN
;
5535 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
5536 !(features
& NETIF_F_IPV6_CSUM
)) {
5537 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
5538 features
&= ~NETIF_F_TSO6
;
5541 /* TSO ECN requires that TSO is present as well. */
5542 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5543 features
&= ~NETIF_F_TSO_ECN
;
5545 /* Software GSO depends on SG. */
5546 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5547 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5548 features
&= ~NETIF_F_GSO
;
5551 /* UFO needs SG and checksumming */
5552 if (features
& NETIF_F_UFO
) {
5553 /* maybe split UFO into V4 and V6? */
5554 if (!((features
& NETIF_F_GEN_CSUM
) ||
5555 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5556 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5558 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5559 features
&= ~NETIF_F_UFO
;
5562 if (!(features
& NETIF_F_SG
)) {
5564 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5565 features
&= ~NETIF_F_UFO
;
5572 int __netdev_update_features(struct net_device
*dev
)
5574 netdev_features_t features
;
5579 features
= netdev_get_wanted_features(dev
);
5581 if (dev
->netdev_ops
->ndo_fix_features
)
5582 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5584 /* driver might be less strict about feature dependencies */
5585 features
= netdev_fix_features(dev
, features
);
5587 if (dev
->features
== features
)
5590 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5591 &dev
->features
, &features
);
5593 if (dev
->netdev_ops
->ndo_set_features
)
5594 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5596 if (unlikely(err
< 0)) {
5598 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5599 err
, &features
, &dev
->features
);
5604 dev
->features
= features
;
5610 * netdev_update_features - recalculate device features
5611 * @dev: the device to check
5613 * Recalculate dev->features set and send notifications if it
5614 * has changed. Should be called after driver or hardware dependent
5615 * conditions might have changed that influence the features.
5617 void netdev_update_features(struct net_device
*dev
)
5619 if (__netdev_update_features(dev
))
5620 netdev_features_change(dev
);
5622 EXPORT_SYMBOL(netdev_update_features
);
5625 * netdev_change_features - recalculate device features
5626 * @dev: the device to check
5628 * Recalculate dev->features set and send notifications even
5629 * if they have not changed. Should be called instead of
5630 * netdev_update_features() if also dev->vlan_features might
5631 * have changed to allow the changes to be propagated to stacked
5634 void netdev_change_features(struct net_device
*dev
)
5636 __netdev_update_features(dev
);
5637 netdev_features_change(dev
);
5639 EXPORT_SYMBOL(netdev_change_features
);
5642 * netif_stacked_transfer_operstate - transfer operstate
5643 * @rootdev: the root or lower level device to transfer state from
5644 * @dev: the device to transfer operstate to
5646 * Transfer operational state from root to device. This is normally
5647 * called when a stacking relationship exists between the root
5648 * device and the device(a leaf device).
5650 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5651 struct net_device
*dev
)
5653 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5654 netif_dormant_on(dev
);
5656 netif_dormant_off(dev
);
5658 if (netif_carrier_ok(rootdev
)) {
5659 if (!netif_carrier_ok(dev
))
5660 netif_carrier_on(dev
);
5662 if (netif_carrier_ok(dev
))
5663 netif_carrier_off(dev
);
5666 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5669 static int netif_alloc_rx_queues(struct net_device
*dev
)
5671 unsigned int i
, count
= dev
->num_rx_queues
;
5672 struct netdev_rx_queue
*rx
;
5676 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5682 for (i
= 0; i
< count
; i
++)
5688 static void netdev_init_one_queue(struct net_device
*dev
,
5689 struct netdev_queue
*queue
, void *_unused
)
5691 /* Initialize queue lock */
5692 spin_lock_init(&queue
->_xmit_lock
);
5693 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5694 queue
->xmit_lock_owner
= -1;
5695 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5698 dql_init(&queue
->dql
, HZ
);
5702 static void netif_free_tx_queues(struct net_device
*dev
)
5704 if (is_vmalloc_addr(dev
->_tx
))
5710 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5712 unsigned int count
= dev
->num_tx_queues
;
5713 struct netdev_queue
*tx
;
5714 size_t sz
= count
* sizeof(*tx
);
5716 BUG_ON(count
< 1 || count
> 0xffff);
5718 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
5726 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5727 spin_lock_init(&dev
->tx_global_lock
);
5733 * register_netdevice - register a network device
5734 * @dev: device to register
5736 * Take a completed network device structure and add it to the kernel
5737 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5738 * chain. 0 is returned on success. A negative errno code is returned
5739 * on a failure to set up the device, or if the name is a duplicate.
5741 * Callers must hold the rtnl semaphore. You may want
5742 * register_netdev() instead of this.
5745 * The locking appears insufficient to guarantee two parallel registers
5746 * will not get the same name.
5749 int register_netdevice(struct net_device
*dev
)
5752 struct net
*net
= dev_net(dev
);
5754 BUG_ON(dev_boot_phase
);
5759 /* When net_device's are persistent, this will be fatal. */
5760 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5763 spin_lock_init(&dev
->addr_list_lock
);
5764 netdev_set_addr_lockdep_class(dev
);
5768 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
5772 /* Init, if this function is available */
5773 if (dev
->netdev_ops
->ndo_init
) {
5774 ret
= dev
->netdev_ops
->ndo_init(dev
);
5782 if (((dev
->hw_features
| dev
->features
) &
5783 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
5784 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
5785 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
5786 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
5793 dev
->ifindex
= dev_new_index(net
);
5794 else if (__dev_get_by_index(net
, dev
->ifindex
))
5797 if (dev
->iflink
== -1)
5798 dev
->iflink
= dev
->ifindex
;
5800 /* Transfer changeable features to wanted_features and enable
5801 * software offloads (GSO and GRO).
5803 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
5804 dev
->features
|= NETIF_F_SOFT_FEATURES
;
5805 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
5807 /* Turn on no cache copy if HW is doing checksum */
5808 if (!(dev
->flags
& IFF_LOOPBACK
)) {
5809 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
5810 if (dev
->features
& NETIF_F_ALL_CSUM
) {
5811 dev
->wanted_features
|= NETIF_F_NOCACHE_COPY
;
5812 dev
->features
|= NETIF_F_NOCACHE_COPY
;
5816 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5818 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
5820 /* Make NETIF_F_SG inheritable to tunnel devices.
5822 dev
->hw_enc_features
|= NETIF_F_SG
;
5824 /* Make NETIF_F_SG inheritable to MPLS.
5826 dev
->mpls_features
|= NETIF_F_SG
;
5828 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5829 ret
= notifier_to_errno(ret
);
5833 ret
= netdev_register_kobject(dev
);
5836 dev
->reg_state
= NETREG_REGISTERED
;
5838 __netdev_update_features(dev
);
5841 * Default initial state at registry is that the
5842 * device is present.
5845 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5847 linkwatch_init_dev(dev
);
5849 dev_init_scheduler(dev
);
5851 list_netdevice(dev
);
5852 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5854 /* If the device has permanent device address, driver should
5855 * set dev_addr and also addr_assign_type should be set to
5856 * NET_ADDR_PERM (default value).
5858 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
5859 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
5861 /* Notify protocols, that a new device appeared. */
5862 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5863 ret
= notifier_to_errno(ret
);
5865 rollback_registered(dev
);
5866 dev
->reg_state
= NETREG_UNREGISTERED
;
5869 * Prevent userspace races by waiting until the network
5870 * device is fully setup before sending notifications.
5872 if (!dev
->rtnl_link_ops
||
5873 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5874 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
5880 if (dev
->netdev_ops
->ndo_uninit
)
5881 dev
->netdev_ops
->ndo_uninit(dev
);
5884 EXPORT_SYMBOL(register_netdevice
);
5887 * init_dummy_netdev - init a dummy network device for NAPI
5888 * @dev: device to init
5890 * This takes a network device structure and initialize the minimum
5891 * amount of fields so it can be used to schedule NAPI polls without
5892 * registering a full blown interface. This is to be used by drivers
5893 * that need to tie several hardware interfaces to a single NAPI
5894 * poll scheduler due to HW limitations.
5896 int init_dummy_netdev(struct net_device
*dev
)
5898 /* Clear everything. Note we don't initialize spinlocks
5899 * are they aren't supposed to be taken by any of the
5900 * NAPI code and this dummy netdev is supposed to be
5901 * only ever used for NAPI polls
5903 memset(dev
, 0, sizeof(struct net_device
));
5905 /* make sure we BUG if trying to hit standard
5906 * register/unregister code path
5908 dev
->reg_state
= NETREG_DUMMY
;
5910 /* NAPI wants this */
5911 INIT_LIST_HEAD(&dev
->napi_list
);
5913 /* a dummy interface is started by default */
5914 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5915 set_bit(__LINK_STATE_START
, &dev
->state
);
5917 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5918 * because users of this 'device' dont need to change
5924 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5928 * register_netdev - register a network device
5929 * @dev: device to register
5931 * Take a completed network device structure and add it to the kernel
5932 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5933 * chain. 0 is returned on success. A negative errno code is returned
5934 * on a failure to set up the device, or if the name is a duplicate.
5936 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5937 * and expands the device name if you passed a format string to
5940 int register_netdev(struct net_device
*dev
)
5945 err
= register_netdevice(dev
);
5949 EXPORT_SYMBOL(register_netdev
);
5951 int netdev_refcnt_read(const struct net_device
*dev
)
5955 for_each_possible_cpu(i
)
5956 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
5959 EXPORT_SYMBOL(netdev_refcnt_read
);
5962 * netdev_wait_allrefs - wait until all references are gone.
5963 * @dev: target net_device
5965 * This is called when unregistering network devices.
5967 * Any protocol or device that holds a reference should register
5968 * for netdevice notification, and cleanup and put back the
5969 * reference if they receive an UNREGISTER event.
5970 * We can get stuck here if buggy protocols don't correctly
5973 static void netdev_wait_allrefs(struct net_device
*dev
)
5975 unsigned long rebroadcast_time
, warning_time
;
5978 linkwatch_forget_dev(dev
);
5980 rebroadcast_time
= warning_time
= jiffies
;
5981 refcnt
= netdev_refcnt_read(dev
);
5983 while (refcnt
!= 0) {
5984 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5987 /* Rebroadcast unregister notification */
5988 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5994 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5995 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5997 /* We must not have linkwatch events
5998 * pending on unregister. If this
5999 * happens, we simply run the queue
6000 * unscheduled, resulting in a noop
6003 linkwatch_run_queue();
6008 rebroadcast_time
= jiffies
;
6013 refcnt
= netdev_refcnt_read(dev
);
6015 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
6016 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6018 warning_time
= jiffies
;
6027 * register_netdevice(x1);
6028 * register_netdevice(x2);
6030 * unregister_netdevice(y1);
6031 * unregister_netdevice(y2);
6037 * We are invoked by rtnl_unlock().
6038 * This allows us to deal with problems:
6039 * 1) We can delete sysfs objects which invoke hotplug
6040 * without deadlocking with linkwatch via keventd.
6041 * 2) Since we run with the RTNL semaphore not held, we can sleep
6042 * safely in order to wait for the netdev refcnt to drop to zero.
6044 * We must not return until all unregister events added during
6045 * the interval the lock was held have been completed.
6047 void netdev_run_todo(void)
6049 struct list_head list
;
6051 /* Snapshot list, allow later requests */
6052 list_replace_init(&net_todo_list
, &list
);
6057 /* Wait for rcu callbacks to finish before next phase */
6058 if (!list_empty(&list
))
6061 while (!list_empty(&list
)) {
6062 struct net_device
*dev
6063 = list_first_entry(&list
, struct net_device
, todo_list
);
6064 list_del(&dev
->todo_list
);
6067 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6070 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
6071 pr_err("network todo '%s' but state %d\n",
6072 dev
->name
, dev
->reg_state
);
6077 dev
->reg_state
= NETREG_UNREGISTERED
;
6079 on_each_cpu(flush_backlog
, dev
, 1);
6081 netdev_wait_allrefs(dev
);
6084 BUG_ON(netdev_refcnt_read(dev
));
6085 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
6086 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
6087 WARN_ON(dev
->dn_ptr
);
6089 if (dev
->destructor
)
6090 dev
->destructor(dev
);
6092 /* Report a network device has been unregistered */
6094 dev_net(dev
)->dev_unreg_count
--;
6096 wake_up(&netdev_unregistering_wq
);
6098 /* Free network device */
6099 kobject_put(&dev
->dev
.kobj
);
6103 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6104 * fields in the same order, with only the type differing.
6106 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
6107 const struct net_device_stats
*netdev_stats
)
6109 #if BITS_PER_LONG == 64
6110 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
6111 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
6113 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
6114 const unsigned long *src
= (const unsigned long *)netdev_stats
;
6115 u64
*dst
= (u64
*)stats64
;
6117 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
6118 sizeof(*stats64
) / sizeof(u64
));
6119 for (i
= 0; i
< n
; i
++)
6123 EXPORT_SYMBOL(netdev_stats_to_stats64
);
6126 * dev_get_stats - get network device statistics
6127 * @dev: device to get statistics from
6128 * @storage: place to store stats
6130 * Get network statistics from device. Return @storage.
6131 * The device driver may provide its own method by setting
6132 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6133 * otherwise the internal statistics structure is used.
6135 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
6136 struct rtnl_link_stats64
*storage
)
6138 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6140 if (ops
->ndo_get_stats64
) {
6141 memset(storage
, 0, sizeof(*storage
));
6142 ops
->ndo_get_stats64(dev
, storage
);
6143 } else if (ops
->ndo_get_stats
) {
6144 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
6146 netdev_stats_to_stats64(storage
, &dev
->stats
);
6148 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
6151 EXPORT_SYMBOL(dev_get_stats
);
6153 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
6155 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
6157 #ifdef CONFIG_NET_CLS_ACT
6160 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
6163 netdev_init_one_queue(dev
, queue
, NULL
);
6164 queue
->qdisc
= &noop_qdisc
;
6165 queue
->qdisc_sleeping
= &noop_qdisc
;
6166 rcu_assign_pointer(dev
->ingress_queue
, queue
);
6171 static const struct ethtool_ops default_ethtool_ops
;
6173 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
6174 const struct ethtool_ops
*ops
)
6176 if (dev
->ethtool_ops
== &default_ethtool_ops
)
6177 dev
->ethtool_ops
= ops
;
6179 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
6181 void netdev_freemem(struct net_device
*dev
)
6183 char *addr
= (char *)dev
- dev
->padded
;
6185 if (is_vmalloc_addr(addr
))
6192 * alloc_netdev_mqs - allocate network device
6193 * @sizeof_priv: size of private data to allocate space for
6194 * @name: device name format string
6195 * @setup: callback to initialize device
6196 * @txqs: the number of TX subqueues to allocate
6197 * @rxqs: the number of RX subqueues to allocate
6199 * Allocates a struct net_device with private data area for driver use
6200 * and performs basic initialization. Also allocates subquue structs
6201 * for each queue on the device.
6203 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
6204 void (*setup
)(struct net_device
*),
6205 unsigned int txqs
, unsigned int rxqs
)
6207 struct net_device
*dev
;
6209 struct net_device
*p
;
6211 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
6214 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6220 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6225 alloc_size
= sizeof(struct net_device
);
6227 /* ensure 32-byte alignment of private area */
6228 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
6229 alloc_size
+= sizeof_priv
;
6231 /* ensure 32-byte alignment of whole construct */
6232 alloc_size
+= NETDEV_ALIGN
- 1;
6234 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6236 p
= vzalloc(alloc_size
);
6240 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
6241 dev
->padded
= (char *)dev
- (char *)p
;
6243 dev
->pcpu_refcnt
= alloc_percpu(int);
6244 if (!dev
->pcpu_refcnt
)
6247 if (dev_addr_init(dev
))
6253 dev_net_set(dev
, &init_net
);
6255 dev
->gso_max_size
= GSO_MAX_SIZE
;
6256 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6258 INIT_LIST_HEAD(&dev
->napi_list
);
6259 INIT_LIST_HEAD(&dev
->unreg_list
);
6260 INIT_LIST_HEAD(&dev
->close_list
);
6261 INIT_LIST_HEAD(&dev
->link_watch_list
);
6262 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
6263 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
6264 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
6265 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
6266 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
6269 dev
->num_tx_queues
= txqs
;
6270 dev
->real_num_tx_queues
= txqs
;
6271 if (netif_alloc_netdev_queues(dev
))
6275 dev
->num_rx_queues
= rxqs
;
6276 dev
->real_num_rx_queues
= rxqs
;
6277 if (netif_alloc_rx_queues(dev
))
6281 strcpy(dev
->name
, name
);
6282 dev
->group
= INIT_NETDEV_GROUP
;
6283 if (!dev
->ethtool_ops
)
6284 dev
->ethtool_ops
= &default_ethtool_ops
;
6292 free_percpu(dev
->pcpu_refcnt
);
6293 netif_free_tx_queues(dev
);
6299 netdev_freemem(dev
);
6302 EXPORT_SYMBOL(alloc_netdev_mqs
);
6305 * free_netdev - free network device
6308 * This function does the last stage of destroying an allocated device
6309 * interface. The reference to the device object is released.
6310 * If this is the last reference then it will be freed.
6312 void free_netdev(struct net_device
*dev
)
6314 struct napi_struct
*p
, *n
;
6316 release_net(dev_net(dev
));
6318 netif_free_tx_queues(dev
);
6323 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6325 /* Flush device addresses */
6326 dev_addr_flush(dev
);
6328 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6331 free_percpu(dev
->pcpu_refcnt
);
6332 dev
->pcpu_refcnt
= NULL
;
6334 /* Compatibility with error handling in drivers */
6335 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6336 netdev_freemem(dev
);
6340 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6341 dev
->reg_state
= NETREG_RELEASED
;
6343 /* will free via device release */
6344 put_device(&dev
->dev
);
6346 EXPORT_SYMBOL(free_netdev
);
6349 * synchronize_net - Synchronize with packet receive processing
6351 * Wait for packets currently being received to be done.
6352 * Does not block later packets from starting.
6354 void synchronize_net(void)
6357 if (rtnl_is_locked())
6358 synchronize_rcu_expedited();
6362 EXPORT_SYMBOL(synchronize_net
);
6365 * unregister_netdevice_queue - remove device from the kernel
6369 * This function shuts down a device interface and removes it
6370 * from the kernel tables.
6371 * If head not NULL, device is queued to be unregistered later.
6373 * Callers must hold the rtnl semaphore. You may want
6374 * unregister_netdev() instead of this.
6377 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6382 list_move_tail(&dev
->unreg_list
, head
);
6384 rollback_registered(dev
);
6385 /* Finish processing unregister after unlock */
6389 EXPORT_SYMBOL(unregister_netdevice_queue
);
6392 * unregister_netdevice_many - unregister many devices
6393 * @head: list of devices
6395 void unregister_netdevice_many(struct list_head
*head
)
6397 struct net_device
*dev
;
6399 if (!list_empty(head
)) {
6400 rollback_registered_many(head
);
6401 list_for_each_entry(dev
, head
, unreg_list
)
6405 EXPORT_SYMBOL(unregister_netdevice_many
);
6408 * unregister_netdev - remove device from the kernel
6411 * This function shuts down a device interface and removes it
6412 * from the kernel tables.
6414 * This is just a wrapper for unregister_netdevice that takes
6415 * the rtnl semaphore. In general you want to use this and not
6416 * unregister_netdevice.
6418 void unregister_netdev(struct net_device
*dev
)
6421 unregister_netdevice(dev
);
6424 EXPORT_SYMBOL(unregister_netdev
);
6427 * dev_change_net_namespace - move device to different nethost namespace
6429 * @net: network namespace
6430 * @pat: If not NULL name pattern to try if the current device name
6431 * is already taken in the destination network namespace.
6433 * This function shuts down a device interface and moves it
6434 * to a new network namespace. On success 0 is returned, on
6435 * a failure a netagive errno code is returned.
6437 * Callers must hold the rtnl semaphore.
6440 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
6446 /* Don't allow namespace local devices to be moved. */
6448 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6451 /* Ensure the device has been registrered */
6452 if (dev
->reg_state
!= NETREG_REGISTERED
)
6455 /* Get out if there is nothing todo */
6457 if (net_eq(dev_net(dev
), net
))
6460 /* Pick the destination device name, and ensure
6461 * we can use it in the destination network namespace.
6464 if (__dev_get_by_name(net
, dev
->name
)) {
6465 /* We get here if we can't use the current device name */
6468 if (dev_get_valid_name(net
, dev
, pat
) < 0)
6473 * And now a mini version of register_netdevice unregister_netdevice.
6476 /* If device is running close it first. */
6479 /* And unlink it from device chain */
6481 unlist_netdevice(dev
);
6485 /* Shutdown queueing discipline. */
6488 /* Notify protocols, that we are about to destroy
6489 this device. They should clean all the things.
6491 Note that dev->reg_state stays at NETREG_REGISTERED.
6492 This is wanted because this way 8021q and macvlan know
6493 the device is just moving and can keep their slaves up.
6495 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6497 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6498 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
6501 * Flush the unicast and multicast chains
6506 /* Send a netdev-removed uevent to the old namespace */
6507 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
6509 /* Actually switch the network namespace */
6510 dev_net_set(dev
, net
);
6512 /* If there is an ifindex conflict assign a new one */
6513 if (__dev_get_by_index(net
, dev
->ifindex
)) {
6514 int iflink
= (dev
->iflink
== dev
->ifindex
);
6515 dev
->ifindex
= dev_new_index(net
);
6517 dev
->iflink
= dev
->ifindex
;
6520 /* Send a netdev-add uevent to the new namespace */
6521 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
6523 /* Fixup kobjects */
6524 err
= device_rename(&dev
->dev
, dev
->name
);
6527 /* Add the device back in the hashes */
6528 list_netdevice(dev
);
6530 /* Notify protocols, that a new device appeared. */
6531 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6534 * Prevent userspace races by waiting until the network
6535 * device is fully setup before sending notifications.
6537 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6544 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6546 static int dev_cpu_callback(struct notifier_block
*nfb
,
6547 unsigned long action
,
6550 struct sk_buff
**list_skb
;
6551 struct sk_buff
*skb
;
6552 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6553 struct softnet_data
*sd
, *oldsd
;
6555 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6558 local_irq_disable();
6559 cpu
= smp_processor_id();
6560 sd
= &per_cpu(softnet_data
, cpu
);
6561 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6563 /* Find end of our completion_queue. */
6564 list_skb
= &sd
->completion_queue
;
6566 list_skb
= &(*list_skb
)->next
;
6567 /* Append completion queue from offline CPU. */
6568 *list_skb
= oldsd
->completion_queue
;
6569 oldsd
->completion_queue
= NULL
;
6571 /* Append output queue from offline CPU. */
6572 if (oldsd
->output_queue
) {
6573 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6574 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6575 oldsd
->output_queue
= NULL
;
6576 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6578 /* Append NAPI poll list from offline CPU. */
6579 if (!list_empty(&oldsd
->poll_list
)) {
6580 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6581 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6584 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6587 /* Process offline CPU's input_pkt_queue */
6588 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6590 input_queue_head_incr(oldsd
);
6592 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6594 input_queue_head_incr(oldsd
);
6602 * netdev_increment_features - increment feature set by one
6603 * @all: current feature set
6604 * @one: new feature set
6605 * @mask: mask feature set
6607 * Computes a new feature set after adding a device with feature set
6608 * @one to the master device with current feature set @all. Will not
6609 * enable anything that is off in @mask. Returns the new feature set.
6611 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6612 netdev_features_t one
, netdev_features_t mask
)
6614 if (mask
& NETIF_F_GEN_CSUM
)
6615 mask
|= NETIF_F_ALL_CSUM
;
6616 mask
|= NETIF_F_VLAN_CHALLENGED
;
6618 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
6619 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
6621 /* If one device supports hw checksumming, set for all. */
6622 if (all
& NETIF_F_GEN_CSUM
)
6623 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6627 EXPORT_SYMBOL(netdev_increment_features
);
6629 static struct hlist_head
* __net_init
netdev_create_hash(void)
6632 struct hlist_head
*hash
;
6634 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6636 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6637 INIT_HLIST_HEAD(&hash
[i
]);
6642 /* Initialize per network namespace state */
6643 static int __net_init
netdev_init(struct net
*net
)
6645 if (net
!= &init_net
)
6646 INIT_LIST_HEAD(&net
->dev_base_head
);
6648 net
->dev_name_head
= netdev_create_hash();
6649 if (net
->dev_name_head
== NULL
)
6652 net
->dev_index_head
= netdev_create_hash();
6653 if (net
->dev_index_head
== NULL
)
6659 kfree(net
->dev_name_head
);
6665 * netdev_drivername - network driver for the device
6666 * @dev: network device
6668 * Determine network driver for device.
6670 const char *netdev_drivername(const struct net_device
*dev
)
6672 const struct device_driver
*driver
;
6673 const struct device
*parent
;
6674 const char *empty
= "";
6676 parent
= dev
->dev
.parent
;
6680 driver
= parent
->driver
;
6681 if (driver
&& driver
->name
)
6682 return driver
->name
;
6686 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
6687 struct va_format
*vaf
)
6691 if (dev
&& dev
->dev
.parent
) {
6692 r
= dev_printk_emit(level
[1] - '0',
6695 dev_driver_string(dev
->dev
.parent
),
6696 dev_name(dev
->dev
.parent
),
6697 netdev_name(dev
), vaf
);
6699 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6701 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6707 int netdev_printk(const char *level
, const struct net_device
*dev
,
6708 const char *format
, ...)
6710 struct va_format vaf
;
6714 va_start(args
, format
);
6719 r
= __netdev_printk(level
, dev
, &vaf
);
6725 EXPORT_SYMBOL(netdev_printk
);
6727 #define define_netdev_printk_level(func, level) \
6728 int func(const struct net_device *dev, const char *fmt, ...) \
6731 struct va_format vaf; \
6734 va_start(args, fmt); \
6739 r = __netdev_printk(level, dev, &vaf); \
6745 EXPORT_SYMBOL(func);
6747 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6748 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6749 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6750 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6751 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6752 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6753 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6755 static void __net_exit
netdev_exit(struct net
*net
)
6757 kfree(net
->dev_name_head
);
6758 kfree(net
->dev_index_head
);
6761 static struct pernet_operations __net_initdata netdev_net_ops
= {
6762 .init
= netdev_init
,
6763 .exit
= netdev_exit
,
6766 static void __net_exit
default_device_exit(struct net
*net
)
6768 struct net_device
*dev
, *aux
;
6770 * Push all migratable network devices back to the
6771 * initial network namespace
6774 for_each_netdev_safe(net
, dev
, aux
) {
6776 char fb_name
[IFNAMSIZ
];
6778 /* Ignore unmoveable devices (i.e. loopback) */
6779 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6782 /* Leave virtual devices for the generic cleanup */
6783 if (dev
->rtnl_link_ops
)
6786 /* Push remaining network devices to init_net */
6787 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6788 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6790 pr_emerg("%s: failed to move %s to init_net: %d\n",
6791 __func__
, dev
->name
, err
);
6798 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
6800 /* Return with the rtnl_lock held when there are no network
6801 * devices unregistering in any network namespace in net_list.
6808 prepare_to_wait(&netdev_unregistering_wq
, &wait
,
6809 TASK_UNINTERRUPTIBLE
);
6810 unregistering
= false;
6812 list_for_each_entry(net
, net_list
, exit_list
) {
6813 if (net
->dev_unreg_count
> 0) {
6814 unregistering
= true;
6823 finish_wait(&netdev_unregistering_wq
, &wait
);
6826 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6828 /* At exit all network devices most be removed from a network
6829 * namespace. Do this in the reverse order of registration.
6830 * Do this across as many network namespaces as possible to
6831 * improve batching efficiency.
6833 struct net_device
*dev
;
6835 LIST_HEAD(dev_kill_list
);
6837 /* To prevent network device cleanup code from dereferencing
6838 * loopback devices or network devices that have been freed
6839 * wait here for all pending unregistrations to complete,
6840 * before unregistring the loopback device and allowing the
6841 * network namespace be freed.
6843 * The netdev todo list containing all network devices
6844 * unregistrations that happen in default_device_exit_batch
6845 * will run in the rtnl_unlock() at the end of
6846 * default_device_exit_batch.
6848 rtnl_lock_unregistering(net_list
);
6849 list_for_each_entry(net
, net_list
, exit_list
) {
6850 for_each_netdev_reverse(net
, dev
) {
6851 if (dev
->rtnl_link_ops
)
6852 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6854 unregister_netdevice_queue(dev
, &dev_kill_list
);
6857 unregister_netdevice_many(&dev_kill_list
);
6858 list_del(&dev_kill_list
);
6862 static struct pernet_operations __net_initdata default_device_ops
= {
6863 .exit
= default_device_exit
,
6864 .exit_batch
= default_device_exit_batch
,
6868 * Initialize the DEV module. At boot time this walks the device list and
6869 * unhooks any devices that fail to initialise (normally hardware not
6870 * present) and leaves us with a valid list of present and active devices.
6875 * This is called single threaded during boot, so no need
6876 * to take the rtnl semaphore.
6878 static int __init
net_dev_init(void)
6880 int i
, rc
= -ENOMEM
;
6882 BUG_ON(!dev_boot_phase
);
6884 if (dev_proc_init())
6887 if (netdev_kobject_init())
6890 INIT_LIST_HEAD(&ptype_all
);
6891 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6892 INIT_LIST_HEAD(&ptype_base
[i
]);
6894 INIT_LIST_HEAD(&offload_base
);
6896 if (register_pernet_subsys(&netdev_net_ops
))
6900 * Initialise the packet receive queues.
6903 for_each_possible_cpu(i
) {
6904 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6906 memset(sd
, 0, sizeof(*sd
));
6907 skb_queue_head_init(&sd
->input_pkt_queue
);
6908 skb_queue_head_init(&sd
->process_queue
);
6909 sd
->completion_queue
= NULL
;
6910 INIT_LIST_HEAD(&sd
->poll_list
);
6911 sd
->output_queue
= NULL
;
6912 sd
->output_queue_tailp
= &sd
->output_queue
;
6914 sd
->csd
.func
= rps_trigger_softirq
;
6920 sd
->backlog
.poll
= process_backlog
;
6921 sd
->backlog
.weight
= weight_p
;
6922 sd
->backlog
.gro_list
= NULL
;
6923 sd
->backlog
.gro_count
= 0;
6925 #ifdef CONFIG_NET_FLOW_LIMIT
6926 sd
->flow_limit
= NULL
;
6932 /* The loopback device is special if any other network devices
6933 * is present in a network namespace the loopback device must
6934 * be present. Since we now dynamically allocate and free the
6935 * loopback device ensure this invariant is maintained by
6936 * keeping the loopback device as the first device on the
6937 * list of network devices. Ensuring the loopback devices
6938 * is the first device that appears and the last network device
6941 if (register_pernet_device(&loopback_net_ops
))
6944 if (register_pernet_device(&default_device_ops
))
6947 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6948 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6950 hotcpu_notifier(dev_cpu_callback
, 0);
6957 subsys_initcall(net_dev_init
);