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 <net/mpls.h>
122 #include <linux/ipv6.h>
123 #include <linux/in.h>
124 #include <linux/jhash.h>
125 #include <linux/random.h>
126 #include <trace/events/napi.h>
127 #include <trace/events/net.h>
128 #include <trace/events/skb.h>
129 #include <linux/pci.h>
130 #include <linux/inetdevice.h>
131 #include <linux/cpu_rmap.h>
132 #include <linux/static_key.h>
133 #include <linux/hashtable.h>
134 #include <linux/vmalloc.h>
135 #include <linux/if_macvlan.h>
136 #include <linux/errqueue.h>
137 #include <linux/hrtimer.h>
139 #include "net-sysfs.h"
141 /* Instead of increasing this, you should create a hash table. */
142 #define MAX_GRO_SKBS 8
144 /* This should be increased if a protocol with a bigger head is added. */
145 #define GRO_MAX_HEAD (MAX_HEADER + 128)
147 static DEFINE_SPINLOCK(ptype_lock
);
148 static DEFINE_SPINLOCK(offload_lock
);
149 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
150 struct list_head ptype_all __read_mostly
; /* Taps */
151 static struct list_head offload_base __read_mostly
;
153 static int netif_rx_internal(struct sk_buff
*skb
);
154 static int call_netdevice_notifiers_info(unsigned long val
,
155 struct net_device
*dev
,
156 struct netdev_notifier_info
*info
);
159 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
162 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
164 * Writers must hold the rtnl semaphore while they loop through the
165 * dev_base_head list, and hold dev_base_lock for writing when they do the
166 * actual updates. This allows pure readers to access the list even
167 * while a writer is preparing to update it.
169 * To put it another way, dev_base_lock is held for writing only to
170 * protect against pure readers; the rtnl semaphore provides the
171 * protection against other writers.
173 * See, for example usages, register_netdevice() and
174 * unregister_netdevice(), which must be called with the rtnl
177 DEFINE_RWLOCK(dev_base_lock
);
178 EXPORT_SYMBOL(dev_base_lock
);
180 /* protects napi_hash addition/deletion and napi_gen_id */
181 static DEFINE_SPINLOCK(napi_hash_lock
);
183 static unsigned int napi_gen_id
;
184 static DEFINE_HASHTABLE(napi_hash
, 8);
186 static seqcount_t devnet_rename_seq
;
188 static inline void dev_base_seq_inc(struct net
*net
)
190 while (++net
->dev_base_seq
== 0);
193 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
195 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
197 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
200 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
202 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
205 static inline void rps_lock(struct softnet_data
*sd
)
208 spin_lock(&sd
->input_pkt_queue
.lock
);
212 static inline void rps_unlock(struct softnet_data
*sd
)
215 spin_unlock(&sd
->input_pkt_queue
.lock
);
219 /* Device list insertion */
220 static void list_netdevice(struct net_device
*dev
)
222 struct net
*net
= dev_net(dev
);
226 write_lock_bh(&dev_base_lock
);
227 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
228 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
229 hlist_add_head_rcu(&dev
->index_hlist
,
230 dev_index_hash(net
, dev
->ifindex
));
231 write_unlock_bh(&dev_base_lock
);
233 dev_base_seq_inc(net
);
236 /* Device list removal
237 * caller must respect a RCU grace period before freeing/reusing dev
239 static void unlist_netdevice(struct net_device
*dev
)
243 /* Unlink dev from the device chain */
244 write_lock_bh(&dev_base_lock
);
245 list_del_rcu(&dev
->dev_list
);
246 hlist_del_rcu(&dev
->name_hlist
);
247 hlist_del_rcu(&dev
->index_hlist
);
248 write_unlock_bh(&dev_base_lock
);
250 dev_base_seq_inc(dev_net(dev
));
257 static RAW_NOTIFIER_HEAD(netdev_chain
);
260 * Device drivers call our routines to queue packets here. We empty the
261 * queue in the local softnet handler.
264 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
265 EXPORT_PER_CPU_SYMBOL(softnet_data
);
267 #ifdef CONFIG_LOCKDEP
269 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
270 * according to dev->type
272 static const unsigned short netdev_lock_type
[] =
273 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
274 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
275 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
276 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
277 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
278 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
279 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
280 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
281 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
282 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
283 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
284 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
285 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
286 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
287 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
289 static const char *const netdev_lock_name
[] =
290 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
291 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
292 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
293 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
294 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
295 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
296 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
297 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
298 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
299 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
300 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
301 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
302 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
303 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
304 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
306 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
307 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
309 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
313 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
314 if (netdev_lock_type
[i
] == dev_type
)
316 /* the last key is used by default */
317 return ARRAY_SIZE(netdev_lock_type
) - 1;
320 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
321 unsigned short dev_type
)
325 i
= netdev_lock_pos(dev_type
);
326 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
327 netdev_lock_name
[i
]);
330 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
334 i
= netdev_lock_pos(dev
->type
);
335 lockdep_set_class_and_name(&dev
->addr_list_lock
,
336 &netdev_addr_lock_key
[i
],
337 netdev_lock_name
[i
]);
340 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
341 unsigned short dev_type
)
344 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
349 /*******************************************************************************
351 Protocol management and registration routines
353 *******************************************************************************/
356 * Add a protocol ID to the list. Now that the input handler is
357 * smarter we can dispense with all the messy stuff that used to be
360 * BEWARE!!! Protocol handlers, mangling input packets,
361 * MUST BE last in hash buckets and checking protocol handlers
362 * MUST start from promiscuous ptype_all chain in net_bh.
363 * It is true now, do not change it.
364 * Explanation follows: if protocol handler, mangling packet, will
365 * be the first on list, it is not able to sense, that packet
366 * is cloned and should be copied-on-write, so that it will
367 * change it and subsequent readers will get broken packet.
371 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
373 if (pt
->type
== htons(ETH_P_ALL
))
374 return pt
->dev
? &pt
->dev
->ptype_all
: &ptype_all
;
376 return pt
->dev
? &pt
->dev
->ptype_specific
:
377 &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
381 * dev_add_pack - add packet handler
382 * @pt: packet type declaration
384 * Add a protocol handler to the networking stack. The passed &packet_type
385 * is linked into kernel lists and may not be freed until it has been
386 * removed from the kernel lists.
388 * This call does not sleep therefore it can not
389 * guarantee all CPU's that are in middle of receiving packets
390 * will see the new packet type (until the next received packet).
393 void dev_add_pack(struct packet_type
*pt
)
395 struct list_head
*head
= ptype_head(pt
);
397 spin_lock(&ptype_lock
);
398 list_add_rcu(&pt
->list
, head
);
399 spin_unlock(&ptype_lock
);
401 EXPORT_SYMBOL(dev_add_pack
);
404 * __dev_remove_pack - remove packet handler
405 * @pt: packet type declaration
407 * Remove a protocol handler that was previously added to the kernel
408 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
409 * from the kernel lists and can be freed or reused once this function
412 * The packet type might still be in use by receivers
413 * and must not be freed until after all the CPU's have gone
414 * through a quiescent state.
416 void __dev_remove_pack(struct packet_type
*pt
)
418 struct list_head
*head
= ptype_head(pt
);
419 struct packet_type
*pt1
;
421 spin_lock(&ptype_lock
);
423 list_for_each_entry(pt1
, head
, list
) {
425 list_del_rcu(&pt
->list
);
430 pr_warn("dev_remove_pack: %p not found\n", pt
);
432 spin_unlock(&ptype_lock
);
434 EXPORT_SYMBOL(__dev_remove_pack
);
437 * dev_remove_pack - remove packet handler
438 * @pt: packet type declaration
440 * Remove a protocol handler that was previously added to the kernel
441 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
442 * from the kernel lists and can be freed or reused once this function
445 * This call sleeps to guarantee that no CPU is looking at the packet
448 void dev_remove_pack(struct packet_type
*pt
)
450 __dev_remove_pack(pt
);
454 EXPORT_SYMBOL(dev_remove_pack
);
458 * dev_add_offload - register offload handlers
459 * @po: protocol offload declaration
461 * Add protocol offload handlers to the networking stack. The passed
462 * &proto_offload is linked into kernel lists and may not be freed until
463 * it has been removed from the kernel lists.
465 * This call does not sleep therefore it can not
466 * guarantee all CPU's that are in middle of receiving packets
467 * will see the new offload handlers (until the next received packet).
469 void dev_add_offload(struct packet_offload
*po
)
471 struct list_head
*head
= &offload_base
;
473 spin_lock(&offload_lock
);
474 list_add_rcu(&po
->list
, head
);
475 spin_unlock(&offload_lock
);
477 EXPORT_SYMBOL(dev_add_offload
);
480 * __dev_remove_offload - remove offload handler
481 * @po: packet offload declaration
483 * Remove a protocol offload handler that was previously added to the
484 * kernel offload handlers by dev_add_offload(). The passed &offload_type
485 * is removed from the kernel lists and can be freed or reused once this
488 * The packet type might still be in use by receivers
489 * and must not be freed until after all the CPU's have gone
490 * through a quiescent state.
492 static void __dev_remove_offload(struct packet_offload
*po
)
494 struct list_head
*head
= &offload_base
;
495 struct packet_offload
*po1
;
497 spin_lock(&offload_lock
);
499 list_for_each_entry(po1
, head
, list
) {
501 list_del_rcu(&po
->list
);
506 pr_warn("dev_remove_offload: %p not found\n", po
);
508 spin_unlock(&offload_lock
);
512 * dev_remove_offload - remove packet offload handler
513 * @po: packet offload declaration
515 * Remove a packet offload handler that was previously added to the kernel
516 * offload handlers by dev_add_offload(). The passed &offload_type is
517 * removed from the kernel lists and can be freed or reused once this
520 * This call sleeps to guarantee that no CPU is looking at the packet
523 void dev_remove_offload(struct packet_offload
*po
)
525 __dev_remove_offload(po
);
529 EXPORT_SYMBOL(dev_remove_offload
);
531 /******************************************************************************
533 Device Boot-time Settings Routines
535 *******************************************************************************/
537 /* Boot time configuration table */
538 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
541 * netdev_boot_setup_add - add new setup entry
542 * @name: name of the device
543 * @map: configured settings for the device
545 * Adds new setup entry to the dev_boot_setup list. The function
546 * returns 0 on error and 1 on success. This is a generic routine to
549 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
551 struct netdev_boot_setup
*s
;
555 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
556 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
557 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
558 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
559 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
564 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
568 * netdev_boot_setup_check - check boot time settings
569 * @dev: the netdevice
571 * Check boot time settings for the device.
572 * The found settings are set for the device to be used
573 * later in the device probing.
574 * Returns 0 if no settings found, 1 if they are.
576 int netdev_boot_setup_check(struct net_device
*dev
)
578 struct netdev_boot_setup
*s
= dev_boot_setup
;
581 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
582 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
583 !strcmp(dev
->name
, s
[i
].name
)) {
584 dev
->irq
= s
[i
].map
.irq
;
585 dev
->base_addr
= s
[i
].map
.base_addr
;
586 dev
->mem_start
= s
[i
].map
.mem_start
;
587 dev
->mem_end
= s
[i
].map
.mem_end
;
593 EXPORT_SYMBOL(netdev_boot_setup_check
);
597 * netdev_boot_base - get address from boot time settings
598 * @prefix: prefix for network device
599 * @unit: id for network device
601 * Check boot time settings for the base address of device.
602 * The found settings are set for the device to be used
603 * later in the device probing.
604 * Returns 0 if no settings found.
606 unsigned long netdev_boot_base(const char *prefix
, int unit
)
608 const struct netdev_boot_setup
*s
= dev_boot_setup
;
612 sprintf(name
, "%s%d", prefix
, unit
);
615 * If device already registered then return base of 1
616 * to indicate not to probe for this interface
618 if (__dev_get_by_name(&init_net
, name
))
621 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
622 if (!strcmp(name
, s
[i
].name
))
623 return s
[i
].map
.base_addr
;
628 * Saves at boot time configured settings for any netdevice.
630 int __init
netdev_boot_setup(char *str
)
635 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
640 memset(&map
, 0, sizeof(map
));
644 map
.base_addr
= ints
[2];
646 map
.mem_start
= ints
[3];
648 map
.mem_end
= ints
[4];
650 /* Add new entry to the list */
651 return netdev_boot_setup_add(str
, &map
);
654 __setup("netdev=", netdev_boot_setup
);
656 /*******************************************************************************
658 Device Interface Subroutines
660 *******************************************************************************/
663 * dev_get_iflink - get 'iflink' value of a interface
664 * @dev: targeted interface
666 * Indicates the ifindex the interface is linked to.
667 * Physical interfaces have the same 'ifindex' and 'iflink' values.
670 int dev_get_iflink(const struct net_device
*dev
)
672 if (dev
->netdev_ops
&& dev
->netdev_ops
->ndo_get_iflink
)
673 return dev
->netdev_ops
->ndo_get_iflink(dev
);
675 /* If dev->rtnl_link_ops is set, it's a virtual interface. */
676 if (dev
->rtnl_link_ops
)
681 EXPORT_SYMBOL(dev_get_iflink
);
684 * __dev_get_by_name - find a device by its name
685 * @net: the applicable net namespace
686 * @name: name to find
688 * Find an interface by name. Must be called under RTNL semaphore
689 * or @dev_base_lock. If the name is found a pointer to the device
690 * is returned. If the name is not found then %NULL is returned. The
691 * reference counters are not incremented so the caller must be
692 * careful with locks.
695 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
697 struct net_device
*dev
;
698 struct hlist_head
*head
= dev_name_hash(net
, name
);
700 hlist_for_each_entry(dev
, head
, name_hlist
)
701 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
706 EXPORT_SYMBOL(__dev_get_by_name
);
709 * dev_get_by_name_rcu - find a device by its name
710 * @net: the applicable net namespace
711 * @name: name to find
713 * Find an interface by name.
714 * If the name is found a pointer to the device is returned.
715 * If the name is not found then %NULL is returned.
716 * The reference counters are not incremented so the caller must be
717 * careful with locks. The caller must hold RCU lock.
720 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
722 struct net_device
*dev
;
723 struct hlist_head
*head
= dev_name_hash(net
, name
);
725 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
726 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
731 EXPORT_SYMBOL(dev_get_by_name_rcu
);
734 * dev_get_by_name - find a device by its name
735 * @net: the applicable net namespace
736 * @name: name to find
738 * Find an interface by name. This can be called from any
739 * context and does its own locking. The returned handle has
740 * the usage count incremented and the caller must use dev_put() to
741 * release it when it is no longer needed. %NULL is returned if no
742 * matching device is found.
745 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
747 struct net_device
*dev
;
750 dev
= dev_get_by_name_rcu(net
, name
);
756 EXPORT_SYMBOL(dev_get_by_name
);
759 * __dev_get_by_index - find a device by its ifindex
760 * @net: the applicable net namespace
761 * @ifindex: index of device
763 * Search for an interface by index. Returns %NULL if the device
764 * is not found or a pointer to the device. The device has not
765 * had its reference counter increased so the caller must be careful
766 * about locking. The caller must hold either the RTNL semaphore
770 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
772 struct net_device
*dev
;
773 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
775 hlist_for_each_entry(dev
, head
, index_hlist
)
776 if (dev
->ifindex
== ifindex
)
781 EXPORT_SYMBOL(__dev_get_by_index
);
784 * dev_get_by_index_rcu - find a device by its ifindex
785 * @net: the applicable net namespace
786 * @ifindex: index of device
788 * Search for an interface by index. Returns %NULL if the device
789 * is not found or a pointer to the device. The device has not
790 * had its reference counter increased so the caller must be careful
791 * about locking. The caller must hold RCU lock.
794 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
796 struct net_device
*dev
;
797 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
799 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
800 if (dev
->ifindex
== ifindex
)
805 EXPORT_SYMBOL(dev_get_by_index_rcu
);
809 * dev_get_by_index - find a device by its ifindex
810 * @net: the applicable net namespace
811 * @ifindex: index of device
813 * Search for an interface by index. Returns NULL if the device
814 * is not found or a pointer to the device. The device returned has
815 * had a reference added and the pointer is safe until the user calls
816 * dev_put to indicate they have finished with it.
819 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
821 struct net_device
*dev
;
824 dev
= dev_get_by_index_rcu(net
, ifindex
);
830 EXPORT_SYMBOL(dev_get_by_index
);
833 * netdev_get_name - get a netdevice name, knowing its ifindex.
834 * @net: network namespace
835 * @name: a pointer to the buffer where the name will be stored.
836 * @ifindex: the ifindex of the interface to get the name from.
838 * The use of raw_seqcount_begin() and cond_resched() before
839 * retrying is required as we want to give the writers a chance
840 * to complete when CONFIG_PREEMPT is not set.
842 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
844 struct net_device
*dev
;
848 seq
= raw_seqcount_begin(&devnet_rename_seq
);
850 dev
= dev_get_by_index_rcu(net
, ifindex
);
856 strcpy(name
, dev
->name
);
858 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
867 * dev_getbyhwaddr_rcu - find a device by its hardware address
868 * @net: the applicable net namespace
869 * @type: media type of device
870 * @ha: hardware address
872 * Search for an interface by MAC address. Returns NULL if the device
873 * is not found or a pointer to the device.
874 * The caller must hold RCU or RTNL.
875 * The returned device has not had its ref count increased
876 * and the caller must therefore be careful about locking
880 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
883 struct net_device
*dev
;
885 for_each_netdev_rcu(net
, dev
)
886 if (dev
->type
== type
&&
887 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
892 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
894 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
896 struct net_device
*dev
;
899 for_each_netdev(net
, dev
)
900 if (dev
->type
== type
)
905 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
907 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
909 struct net_device
*dev
, *ret
= NULL
;
912 for_each_netdev_rcu(net
, dev
)
913 if (dev
->type
== type
) {
921 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
924 * __dev_get_by_flags - find any device with given flags
925 * @net: the applicable net namespace
926 * @if_flags: IFF_* values
927 * @mask: bitmask of bits in if_flags to check
929 * Search for any interface with the given flags. Returns NULL if a device
930 * is not found or a pointer to the device. Must be called inside
931 * rtnl_lock(), and result refcount is unchanged.
934 struct net_device
*__dev_get_by_flags(struct net
*net
, unsigned short if_flags
,
937 struct net_device
*dev
, *ret
;
942 for_each_netdev(net
, dev
) {
943 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
950 EXPORT_SYMBOL(__dev_get_by_flags
);
953 * dev_valid_name - check if name is okay for network device
956 * Network device names need to be valid file names to
957 * to allow sysfs to work. We also disallow any kind of
960 bool dev_valid_name(const char *name
)
964 if (strlen(name
) >= IFNAMSIZ
)
966 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
970 if (*name
== '/' || *name
== ':' || isspace(*name
))
976 EXPORT_SYMBOL(dev_valid_name
);
979 * __dev_alloc_name - allocate a name for a device
980 * @net: network namespace to allocate the device name in
981 * @name: name format string
982 * @buf: scratch buffer and result name string
984 * Passed a format string - eg "lt%d" it will try and find a suitable
985 * id. It scans list of devices to build up a free map, then chooses
986 * the first empty slot. The caller must hold the dev_base or rtnl lock
987 * while allocating the name and adding the device in order to avoid
989 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
990 * Returns the number of the unit assigned or a negative errno code.
993 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
997 const int max_netdevices
= 8*PAGE_SIZE
;
998 unsigned long *inuse
;
999 struct net_device
*d
;
1001 p
= strnchr(name
, IFNAMSIZ
-1, '%');
1004 * Verify the string as this thing may have come from
1005 * the user. There must be either one "%d" and no other "%"
1008 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
1011 /* Use one page as a bit array of possible slots */
1012 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
1016 for_each_netdev(net
, d
) {
1017 if (!sscanf(d
->name
, name
, &i
))
1019 if (i
< 0 || i
>= max_netdevices
)
1022 /* avoid cases where sscanf is not exact inverse of printf */
1023 snprintf(buf
, IFNAMSIZ
, name
, i
);
1024 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
1028 i
= find_first_zero_bit(inuse
, max_netdevices
);
1029 free_page((unsigned long) inuse
);
1033 snprintf(buf
, IFNAMSIZ
, name
, i
);
1034 if (!__dev_get_by_name(net
, buf
))
1037 /* It is possible to run out of possible slots
1038 * when the name is long and there isn't enough space left
1039 * for the digits, or if all bits are used.
1045 * dev_alloc_name - allocate a name for a device
1047 * @name: name format string
1049 * Passed a format string - eg "lt%d" it will try and find a suitable
1050 * id. It scans list of devices to build up a free map, then chooses
1051 * the first empty slot. The caller must hold the dev_base or rtnl lock
1052 * while allocating the name and adding the device in order to avoid
1054 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1055 * Returns the number of the unit assigned or a negative errno code.
1058 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1064 BUG_ON(!dev_net(dev
));
1066 ret
= __dev_alloc_name(net
, name
, buf
);
1068 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1071 EXPORT_SYMBOL(dev_alloc_name
);
1073 static int dev_alloc_name_ns(struct net
*net
,
1074 struct net_device
*dev
,
1080 ret
= __dev_alloc_name(net
, name
, buf
);
1082 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1086 static int dev_get_valid_name(struct net
*net
,
1087 struct net_device
*dev
,
1092 if (!dev_valid_name(name
))
1095 if (strchr(name
, '%'))
1096 return dev_alloc_name_ns(net
, dev
, name
);
1097 else if (__dev_get_by_name(net
, name
))
1099 else if (dev
->name
!= name
)
1100 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1106 * dev_change_name - change name of a device
1108 * @newname: name (or format string) must be at least IFNAMSIZ
1110 * Change name of a device, can pass format strings "eth%d".
1113 int dev_change_name(struct net_device
*dev
, const char *newname
)
1115 unsigned char old_assign_type
;
1116 char oldname
[IFNAMSIZ
];
1122 BUG_ON(!dev_net(dev
));
1125 if (dev
->flags
& IFF_UP
)
1128 write_seqcount_begin(&devnet_rename_seq
);
1130 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1131 write_seqcount_end(&devnet_rename_seq
);
1135 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1137 err
= dev_get_valid_name(net
, dev
, newname
);
1139 write_seqcount_end(&devnet_rename_seq
);
1143 if (oldname
[0] && !strchr(oldname
, '%'))
1144 netdev_info(dev
, "renamed from %s\n", oldname
);
1146 old_assign_type
= dev
->name_assign_type
;
1147 dev
->name_assign_type
= NET_NAME_RENAMED
;
1150 ret
= device_rename(&dev
->dev
, dev
->name
);
1152 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1153 dev
->name_assign_type
= old_assign_type
;
1154 write_seqcount_end(&devnet_rename_seq
);
1158 write_seqcount_end(&devnet_rename_seq
);
1160 netdev_adjacent_rename_links(dev
, oldname
);
1162 write_lock_bh(&dev_base_lock
);
1163 hlist_del_rcu(&dev
->name_hlist
);
1164 write_unlock_bh(&dev_base_lock
);
1168 write_lock_bh(&dev_base_lock
);
1169 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1170 write_unlock_bh(&dev_base_lock
);
1172 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1173 ret
= notifier_to_errno(ret
);
1176 /* err >= 0 after dev_alloc_name() or stores the first errno */
1179 write_seqcount_begin(&devnet_rename_seq
);
1180 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1181 memcpy(oldname
, newname
, IFNAMSIZ
);
1182 dev
->name_assign_type
= old_assign_type
;
1183 old_assign_type
= NET_NAME_RENAMED
;
1186 pr_err("%s: name change rollback failed: %d\n",
1195 * dev_set_alias - change ifalias of a device
1197 * @alias: name up to IFALIASZ
1198 * @len: limit of bytes to copy from info
1200 * Set ifalias for a device,
1202 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1208 if (len
>= IFALIASZ
)
1212 kfree(dev
->ifalias
);
1213 dev
->ifalias
= NULL
;
1217 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1220 dev
->ifalias
= new_ifalias
;
1222 strlcpy(dev
->ifalias
, alias
, len
+1);
1228 * netdev_features_change - device changes features
1229 * @dev: device to cause notification
1231 * Called to indicate a device has changed features.
1233 void netdev_features_change(struct net_device
*dev
)
1235 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1237 EXPORT_SYMBOL(netdev_features_change
);
1240 * netdev_state_change - device changes state
1241 * @dev: device to cause notification
1243 * Called to indicate a device has changed state. This function calls
1244 * the notifier chains for netdev_chain and sends a NEWLINK message
1245 * to the routing socket.
1247 void netdev_state_change(struct net_device
*dev
)
1249 if (dev
->flags
& IFF_UP
) {
1250 struct netdev_notifier_change_info change_info
;
1252 change_info
.flags_changed
= 0;
1253 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
1255 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1258 EXPORT_SYMBOL(netdev_state_change
);
1261 * netdev_notify_peers - notify network peers about existence of @dev
1262 * @dev: network device
1264 * Generate traffic such that interested network peers are aware of
1265 * @dev, such as by generating a gratuitous ARP. This may be used when
1266 * a device wants to inform the rest of the network about some sort of
1267 * reconfiguration such as a failover event or virtual machine
1270 void netdev_notify_peers(struct net_device
*dev
)
1273 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1276 EXPORT_SYMBOL(netdev_notify_peers
);
1278 static int __dev_open(struct net_device
*dev
)
1280 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1285 if (!netif_device_present(dev
))
1288 /* Block netpoll from trying to do any rx path servicing.
1289 * If we don't do this there is a chance ndo_poll_controller
1290 * or ndo_poll may be running while we open the device
1292 netpoll_poll_disable(dev
);
1294 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1295 ret
= notifier_to_errno(ret
);
1299 set_bit(__LINK_STATE_START
, &dev
->state
);
1301 if (ops
->ndo_validate_addr
)
1302 ret
= ops
->ndo_validate_addr(dev
);
1304 if (!ret
&& ops
->ndo_open
)
1305 ret
= ops
->ndo_open(dev
);
1307 netpoll_poll_enable(dev
);
1310 clear_bit(__LINK_STATE_START
, &dev
->state
);
1312 dev
->flags
|= IFF_UP
;
1313 dev_set_rx_mode(dev
);
1315 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1322 * dev_open - prepare an interface for use.
1323 * @dev: device to open
1325 * Takes a device from down to up state. The device's private open
1326 * function is invoked and then the multicast lists are loaded. Finally
1327 * the device is moved into the up state and a %NETDEV_UP message is
1328 * sent to the netdev notifier chain.
1330 * Calling this function on an active interface is a nop. On a failure
1331 * a negative errno code is returned.
1333 int dev_open(struct net_device
*dev
)
1337 if (dev
->flags
& IFF_UP
)
1340 ret
= __dev_open(dev
);
1344 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1345 call_netdevice_notifiers(NETDEV_UP
, dev
);
1349 EXPORT_SYMBOL(dev_open
);
1351 static int __dev_close_many(struct list_head
*head
)
1353 struct net_device
*dev
;
1358 list_for_each_entry(dev
, head
, close_list
) {
1359 /* Temporarily disable netpoll until the interface is down */
1360 netpoll_poll_disable(dev
);
1362 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1364 clear_bit(__LINK_STATE_START
, &dev
->state
);
1366 /* Synchronize to scheduled poll. We cannot touch poll list, it
1367 * can be even on different cpu. So just clear netif_running().
1369 * dev->stop() will invoke napi_disable() on all of it's
1370 * napi_struct instances on this device.
1372 smp_mb__after_atomic(); /* Commit netif_running(). */
1375 dev_deactivate_many(head
);
1377 list_for_each_entry(dev
, head
, close_list
) {
1378 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1381 * Call the device specific close. This cannot fail.
1382 * Only if device is UP
1384 * We allow it to be called even after a DETACH hot-plug
1390 dev
->flags
&= ~IFF_UP
;
1391 netpoll_poll_enable(dev
);
1397 static int __dev_close(struct net_device
*dev
)
1402 list_add(&dev
->close_list
, &single
);
1403 retval
= __dev_close_many(&single
);
1409 int dev_close_many(struct list_head
*head
, bool unlink
)
1411 struct net_device
*dev
, *tmp
;
1413 /* Remove the devices that don't need to be closed */
1414 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1415 if (!(dev
->flags
& IFF_UP
))
1416 list_del_init(&dev
->close_list
);
1418 __dev_close_many(head
);
1420 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1421 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1422 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1424 list_del_init(&dev
->close_list
);
1429 EXPORT_SYMBOL(dev_close_many
);
1432 * dev_close - shutdown an interface.
1433 * @dev: device to shutdown
1435 * This function moves an active device into down state. A
1436 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1437 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1440 int dev_close(struct net_device
*dev
)
1442 if (dev
->flags
& IFF_UP
) {
1445 list_add(&dev
->close_list
, &single
);
1446 dev_close_many(&single
, true);
1451 EXPORT_SYMBOL(dev_close
);
1455 * dev_disable_lro - disable Large Receive Offload on a device
1458 * Disable Large Receive Offload (LRO) on a net device. Must be
1459 * called under RTNL. This is needed if received packets may be
1460 * forwarded to another interface.
1462 void dev_disable_lro(struct net_device
*dev
)
1464 struct net_device
*lower_dev
;
1465 struct list_head
*iter
;
1467 dev
->wanted_features
&= ~NETIF_F_LRO
;
1468 netdev_update_features(dev
);
1470 if (unlikely(dev
->features
& NETIF_F_LRO
))
1471 netdev_WARN(dev
, "failed to disable LRO!\n");
1473 netdev_for_each_lower_dev(dev
, lower_dev
, iter
)
1474 dev_disable_lro(lower_dev
);
1476 EXPORT_SYMBOL(dev_disable_lro
);
1478 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1479 struct net_device
*dev
)
1481 struct netdev_notifier_info info
;
1483 netdev_notifier_info_init(&info
, dev
);
1484 return nb
->notifier_call(nb
, val
, &info
);
1487 static int dev_boot_phase
= 1;
1490 * register_netdevice_notifier - register a network notifier block
1493 * Register a notifier to be called when network device events occur.
1494 * The notifier passed is linked into the kernel structures and must
1495 * not be reused until it has been unregistered. A negative errno code
1496 * is returned on a failure.
1498 * When registered all registration and up events are replayed
1499 * to the new notifier to allow device to have a race free
1500 * view of the network device list.
1503 int register_netdevice_notifier(struct notifier_block
*nb
)
1505 struct net_device
*dev
;
1506 struct net_device
*last
;
1511 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1517 for_each_netdev(net
, dev
) {
1518 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1519 err
= notifier_to_errno(err
);
1523 if (!(dev
->flags
& IFF_UP
))
1526 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1537 for_each_netdev(net
, dev
) {
1541 if (dev
->flags
& IFF_UP
) {
1542 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1544 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1546 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1551 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1554 EXPORT_SYMBOL(register_netdevice_notifier
);
1557 * unregister_netdevice_notifier - unregister a network notifier block
1560 * Unregister a notifier previously registered by
1561 * register_netdevice_notifier(). The notifier is unlinked into the
1562 * kernel structures and may then be reused. A negative errno code
1563 * is returned on a failure.
1565 * After unregistering unregister and down device events are synthesized
1566 * for all devices on the device list to the removed notifier to remove
1567 * the need for special case cleanup code.
1570 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1572 struct net_device
*dev
;
1577 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1582 for_each_netdev(net
, dev
) {
1583 if (dev
->flags
& IFF_UP
) {
1584 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1586 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1588 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1595 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1598 * call_netdevice_notifiers_info - call all network notifier blocks
1599 * @val: value passed unmodified to notifier function
1600 * @dev: net_device pointer passed unmodified to notifier function
1601 * @info: notifier information data
1603 * Call all network notifier blocks. Parameters and return value
1604 * are as for raw_notifier_call_chain().
1607 static int call_netdevice_notifiers_info(unsigned long val
,
1608 struct net_device
*dev
,
1609 struct netdev_notifier_info
*info
)
1612 netdev_notifier_info_init(info
, dev
);
1613 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1617 * call_netdevice_notifiers - call all network notifier blocks
1618 * @val: value passed unmodified to notifier function
1619 * @dev: net_device pointer passed unmodified to notifier function
1621 * Call all network notifier blocks. Parameters and return value
1622 * are as for raw_notifier_call_chain().
1625 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1627 struct netdev_notifier_info info
;
1629 return call_netdevice_notifiers_info(val
, dev
, &info
);
1631 EXPORT_SYMBOL(call_netdevice_notifiers
);
1633 static struct static_key netstamp_needed __read_mostly
;
1634 #ifdef HAVE_JUMP_LABEL
1635 /* We are not allowed to call static_key_slow_dec() from irq context
1636 * If net_disable_timestamp() is called from irq context, defer the
1637 * static_key_slow_dec() calls.
1639 static atomic_t netstamp_needed_deferred
;
1642 void net_enable_timestamp(void)
1644 #ifdef HAVE_JUMP_LABEL
1645 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1649 static_key_slow_dec(&netstamp_needed
);
1653 static_key_slow_inc(&netstamp_needed
);
1655 EXPORT_SYMBOL(net_enable_timestamp
);
1657 void net_disable_timestamp(void)
1659 #ifdef HAVE_JUMP_LABEL
1660 if (in_interrupt()) {
1661 atomic_inc(&netstamp_needed_deferred
);
1665 static_key_slow_dec(&netstamp_needed
);
1667 EXPORT_SYMBOL(net_disable_timestamp
);
1669 static inline void net_timestamp_set(struct sk_buff
*skb
)
1671 skb
->tstamp
.tv64
= 0;
1672 if (static_key_false(&netstamp_needed
))
1673 __net_timestamp(skb
);
1676 #define net_timestamp_check(COND, SKB) \
1677 if (static_key_false(&netstamp_needed)) { \
1678 if ((COND) && !(SKB)->tstamp.tv64) \
1679 __net_timestamp(SKB); \
1682 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1686 if (!(dev
->flags
& IFF_UP
))
1689 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1690 if (skb
->len
<= len
)
1693 /* if TSO is enabled, we don't care about the length as the packet
1694 * could be forwarded without being segmented before
1696 if (skb_is_gso(skb
))
1701 EXPORT_SYMBOL_GPL(is_skb_forwardable
);
1703 int __dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1705 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1706 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1707 atomic_long_inc(&dev
->rx_dropped
);
1713 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1714 atomic_long_inc(&dev
->rx_dropped
);
1719 skb_scrub_packet(skb
, true);
1721 skb
->protocol
= eth_type_trans(skb
, dev
);
1722 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
1726 EXPORT_SYMBOL_GPL(__dev_forward_skb
);
1729 * dev_forward_skb - loopback an skb to another netif
1731 * @dev: destination network device
1732 * @skb: buffer to forward
1735 * NET_RX_SUCCESS (no congestion)
1736 * NET_RX_DROP (packet was dropped, but freed)
1738 * dev_forward_skb can be used for injecting an skb from the
1739 * start_xmit function of one device into the receive queue
1740 * of another device.
1742 * The receiving device may be in another namespace, so
1743 * we have to clear all information in the skb that could
1744 * impact namespace isolation.
1746 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1748 return __dev_forward_skb(dev
, skb
) ?: netif_rx_internal(skb
);
1750 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1752 static inline int deliver_skb(struct sk_buff
*skb
,
1753 struct packet_type
*pt_prev
,
1754 struct net_device
*orig_dev
)
1756 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1758 atomic_inc(&skb
->users
);
1759 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1762 static inline void deliver_ptype_list_skb(struct sk_buff
*skb
,
1763 struct packet_type
**pt
,
1764 struct net_device
*orig_dev
,
1766 struct list_head
*ptype_list
)
1768 struct packet_type
*ptype
, *pt_prev
= *pt
;
1770 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1771 if (ptype
->type
!= type
)
1774 deliver_skb(skb
, pt_prev
, orig_dev
);
1780 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1782 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1785 if (ptype
->id_match
)
1786 return ptype
->id_match(ptype
, skb
->sk
);
1787 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1794 * Support routine. Sends outgoing frames to any network
1795 * taps currently in use.
1798 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1800 struct packet_type
*ptype
;
1801 struct sk_buff
*skb2
= NULL
;
1802 struct packet_type
*pt_prev
= NULL
;
1803 struct list_head
*ptype_list
= &ptype_all
;
1807 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1808 /* Never send packets back to the socket
1809 * they originated from - MvS (miquels@drinkel.ow.org)
1811 if (skb_loop_sk(ptype
, skb
))
1815 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1820 /* need to clone skb, done only once */
1821 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1825 net_timestamp_set(skb2
);
1827 /* skb->nh should be correctly
1828 * set by sender, so that the second statement is
1829 * just protection against buggy protocols.
1831 skb_reset_mac_header(skb2
);
1833 if (skb_network_header(skb2
) < skb2
->data
||
1834 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1835 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1836 ntohs(skb2
->protocol
),
1838 skb_reset_network_header(skb2
);
1841 skb2
->transport_header
= skb2
->network_header
;
1842 skb2
->pkt_type
= PACKET_OUTGOING
;
1846 if (ptype_list
== &ptype_all
) {
1847 ptype_list
= &dev
->ptype_all
;
1852 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1857 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1858 * @dev: Network device
1859 * @txq: number of queues available
1861 * If real_num_tx_queues is changed the tc mappings may no longer be
1862 * valid. To resolve this verify the tc mapping remains valid and if
1863 * not NULL the mapping. With no priorities mapping to this
1864 * offset/count pair it will no longer be used. In the worst case TC0
1865 * is invalid nothing can be done so disable priority mappings. If is
1866 * expected that drivers will fix this mapping if they can before
1867 * calling netif_set_real_num_tx_queues.
1869 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1872 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1874 /* If TC0 is invalidated disable TC mapping */
1875 if (tc
->offset
+ tc
->count
> txq
) {
1876 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1881 /* Invalidated prio to tc mappings set to TC0 */
1882 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1883 int q
= netdev_get_prio_tc_map(dev
, i
);
1885 tc
= &dev
->tc_to_txq
[q
];
1886 if (tc
->offset
+ tc
->count
> txq
) {
1887 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1889 netdev_set_prio_tc_map(dev
, i
, 0);
1895 static DEFINE_MUTEX(xps_map_mutex
);
1896 #define xmap_dereference(P) \
1897 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1899 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1902 struct xps_map
*map
= NULL
;
1906 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1908 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1909 if (map
->queues
[pos
] == index
) {
1911 map
->queues
[pos
] = map
->queues
[--map
->len
];
1913 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1914 kfree_rcu(map
, rcu
);
1924 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1926 struct xps_dev_maps
*dev_maps
;
1928 bool active
= false;
1930 mutex_lock(&xps_map_mutex
);
1931 dev_maps
= xmap_dereference(dev
->xps_maps
);
1936 for_each_possible_cpu(cpu
) {
1937 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1938 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1941 if (i
== dev
->num_tx_queues
)
1946 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1947 kfree_rcu(dev_maps
, rcu
);
1950 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1951 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1955 mutex_unlock(&xps_map_mutex
);
1958 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1961 struct xps_map
*new_map
;
1962 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1965 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1966 if (map
->queues
[pos
] != index
)
1971 /* Need to add queue to this CPU's existing map */
1973 if (pos
< map
->alloc_len
)
1976 alloc_len
= map
->alloc_len
* 2;
1979 /* Need to allocate new map to store queue on this CPU's map */
1980 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1985 for (i
= 0; i
< pos
; i
++)
1986 new_map
->queues
[i
] = map
->queues
[i
];
1987 new_map
->alloc_len
= alloc_len
;
1993 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
1996 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
1997 struct xps_map
*map
, *new_map
;
1998 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
1999 int cpu
, numa_node_id
= -2;
2000 bool active
= false;
2002 mutex_lock(&xps_map_mutex
);
2004 dev_maps
= xmap_dereference(dev
->xps_maps
);
2006 /* allocate memory for queue storage */
2007 for_each_online_cpu(cpu
) {
2008 if (!cpumask_test_cpu(cpu
, mask
))
2012 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
2013 if (!new_dev_maps
) {
2014 mutex_unlock(&xps_map_mutex
);
2018 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2021 map
= expand_xps_map(map
, cpu
, index
);
2025 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2029 goto out_no_new_maps
;
2031 for_each_possible_cpu(cpu
) {
2032 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
2033 /* add queue to CPU maps */
2036 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2037 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
2040 if (pos
== map
->len
)
2041 map
->queues
[map
->len
++] = index
;
2043 if (numa_node_id
== -2)
2044 numa_node_id
= cpu_to_node(cpu
);
2045 else if (numa_node_id
!= cpu_to_node(cpu
))
2048 } else if (dev_maps
) {
2049 /* fill in the new device map from the old device map */
2050 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2051 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2056 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
2058 /* Cleanup old maps */
2060 for_each_possible_cpu(cpu
) {
2061 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2062 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2063 if (map
&& map
!= new_map
)
2064 kfree_rcu(map
, rcu
);
2067 kfree_rcu(dev_maps
, rcu
);
2070 dev_maps
= new_dev_maps
;
2074 /* update Tx queue numa node */
2075 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2076 (numa_node_id
>= 0) ? numa_node_id
:
2082 /* removes queue from unused CPUs */
2083 for_each_possible_cpu(cpu
) {
2084 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2087 if (remove_xps_queue(dev_maps
, cpu
, index
))
2091 /* free map if not active */
2093 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2094 kfree_rcu(dev_maps
, rcu
);
2098 mutex_unlock(&xps_map_mutex
);
2102 /* remove any maps that we added */
2103 for_each_possible_cpu(cpu
) {
2104 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2105 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2107 if (new_map
&& new_map
!= map
)
2111 mutex_unlock(&xps_map_mutex
);
2113 kfree(new_dev_maps
);
2116 EXPORT_SYMBOL(netif_set_xps_queue
);
2120 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2121 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2123 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2127 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2130 if (dev
->reg_state
== NETREG_REGISTERED
||
2131 dev
->reg_state
== NETREG_UNREGISTERING
) {
2134 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2140 netif_setup_tc(dev
, txq
);
2142 if (txq
< dev
->real_num_tx_queues
) {
2143 qdisc_reset_all_tx_gt(dev
, txq
);
2145 netif_reset_xps_queues_gt(dev
, txq
);
2150 dev
->real_num_tx_queues
= txq
;
2153 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2157 * netif_set_real_num_rx_queues - set actual number of RX queues used
2158 * @dev: Network device
2159 * @rxq: Actual number of RX queues
2161 * This must be called either with the rtnl_lock held or before
2162 * registration of the net device. Returns 0 on success, or a
2163 * negative error code. If called before registration, it always
2166 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2170 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2173 if (dev
->reg_state
== NETREG_REGISTERED
) {
2176 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2182 dev
->real_num_rx_queues
= rxq
;
2185 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2189 * netif_get_num_default_rss_queues - default number of RSS queues
2191 * This routine should set an upper limit on the number of RSS queues
2192 * used by default by multiqueue devices.
2194 int netif_get_num_default_rss_queues(void)
2196 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2198 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2200 static inline void __netif_reschedule(struct Qdisc
*q
)
2202 struct softnet_data
*sd
;
2203 unsigned long flags
;
2205 local_irq_save(flags
);
2206 sd
= this_cpu_ptr(&softnet_data
);
2207 q
->next_sched
= NULL
;
2208 *sd
->output_queue_tailp
= q
;
2209 sd
->output_queue_tailp
= &q
->next_sched
;
2210 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2211 local_irq_restore(flags
);
2214 void __netif_schedule(struct Qdisc
*q
)
2216 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2217 __netif_reschedule(q
);
2219 EXPORT_SYMBOL(__netif_schedule
);
2221 struct dev_kfree_skb_cb
{
2222 enum skb_free_reason reason
;
2225 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2227 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2230 void netif_schedule_queue(struct netdev_queue
*txq
)
2233 if (!(txq
->state
& QUEUE_STATE_ANY_XOFF
)) {
2234 struct Qdisc
*q
= rcu_dereference(txq
->qdisc
);
2236 __netif_schedule(q
);
2240 EXPORT_SYMBOL(netif_schedule_queue
);
2243 * netif_wake_subqueue - allow sending packets on subqueue
2244 * @dev: network device
2245 * @queue_index: sub queue index
2247 * Resume individual transmit queue of a device with multiple transmit queues.
2249 void netif_wake_subqueue(struct net_device
*dev
, u16 queue_index
)
2251 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
2253 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &txq
->state
)) {
2257 q
= rcu_dereference(txq
->qdisc
);
2258 __netif_schedule(q
);
2262 EXPORT_SYMBOL(netif_wake_subqueue
);
2264 void netif_tx_wake_queue(struct netdev_queue
*dev_queue
)
2266 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &dev_queue
->state
)) {
2270 q
= rcu_dereference(dev_queue
->qdisc
);
2271 __netif_schedule(q
);
2275 EXPORT_SYMBOL(netif_tx_wake_queue
);
2277 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2279 unsigned long flags
;
2281 if (likely(atomic_read(&skb
->users
) == 1)) {
2283 atomic_set(&skb
->users
, 0);
2284 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2287 get_kfree_skb_cb(skb
)->reason
= reason
;
2288 local_irq_save(flags
);
2289 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2290 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2291 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2292 local_irq_restore(flags
);
2294 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2296 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2298 if (in_irq() || irqs_disabled())
2299 __dev_kfree_skb_irq(skb
, reason
);
2303 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2307 * netif_device_detach - mark device as removed
2308 * @dev: network device
2310 * Mark device as removed from system and therefore no longer available.
2312 void netif_device_detach(struct net_device
*dev
)
2314 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2315 netif_running(dev
)) {
2316 netif_tx_stop_all_queues(dev
);
2319 EXPORT_SYMBOL(netif_device_detach
);
2322 * netif_device_attach - mark device as attached
2323 * @dev: network device
2325 * Mark device as attached from system and restart if needed.
2327 void netif_device_attach(struct net_device
*dev
)
2329 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2330 netif_running(dev
)) {
2331 netif_tx_wake_all_queues(dev
);
2332 __netdev_watchdog_up(dev
);
2335 EXPORT_SYMBOL(netif_device_attach
);
2337 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2339 static const netdev_features_t null_features
= 0;
2340 struct net_device
*dev
= skb
->dev
;
2341 const char *driver
= "";
2343 if (!net_ratelimit())
2346 if (dev
&& dev
->dev
.parent
)
2347 driver
= dev_driver_string(dev
->dev
.parent
);
2349 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2350 "gso_type=%d ip_summed=%d\n",
2351 driver
, dev
? &dev
->features
: &null_features
,
2352 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2353 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2354 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2358 * Invalidate hardware checksum when packet is to be mangled, and
2359 * complete checksum manually on outgoing path.
2361 int skb_checksum_help(struct sk_buff
*skb
)
2364 int ret
= 0, offset
;
2366 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2367 goto out_set_summed
;
2369 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2370 skb_warn_bad_offload(skb
);
2374 /* Before computing a checksum, we should make sure no frag could
2375 * be modified by an external entity : checksum could be wrong.
2377 if (skb_has_shared_frag(skb
)) {
2378 ret
= __skb_linearize(skb
);
2383 offset
= skb_checksum_start_offset(skb
);
2384 BUG_ON(offset
>= skb_headlen(skb
));
2385 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2387 offset
+= skb
->csum_offset
;
2388 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2390 if (skb_cloned(skb
) &&
2391 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2392 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2397 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2399 skb
->ip_summed
= CHECKSUM_NONE
;
2403 EXPORT_SYMBOL(skb_checksum_help
);
2405 __be16
skb_network_protocol(struct sk_buff
*skb
, int *depth
)
2407 __be16 type
= skb
->protocol
;
2409 /* Tunnel gso handlers can set protocol to ethernet. */
2410 if (type
== htons(ETH_P_TEB
)) {
2413 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2416 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2417 type
= eth
->h_proto
;
2420 return __vlan_get_protocol(skb
, type
, depth
);
2424 * skb_mac_gso_segment - mac layer segmentation handler.
2425 * @skb: buffer to segment
2426 * @features: features for the output path (see dev->features)
2428 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2429 netdev_features_t features
)
2431 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2432 struct packet_offload
*ptype
;
2433 int vlan_depth
= skb
->mac_len
;
2434 __be16 type
= skb_network_protocol(skb
, &vlan_depth
);
2436 if (unlikely(!type
))
2437 return ERR_PTR(-EINVAL
);
2439 __skb_pull(skb
, vlan_depth
);
2442 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2443 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2444 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2450 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2454 EXPORT_SYMBOL(skb_mac_gso_segment
);
2457 /* openvswitch calls this on rx path, so we need a different check.
2459 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2462 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2464 return skb
->ip_summed
== CHECKSUM_NONE
;
2468 * __skb_gso_segment - Perform segmentation on skb.
2469 * @skb: buffer to segment
2470 * @features: features for the output path (see dev->features)
2471 * @tx_path: whether it is called in TX path
2473 * This function segments the given skb and returns a list of segments.
2475 * It may return NULL if the skb requires no segmentation. This is
2476 * only possible when GSO is used for verifying header integrity.
2478 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2479 netdev_features_t features
, bool tx_path
)
2481 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2484 skb_warn_bad_offload(skb
);
2486 err
= skb_cow_head(skb
, 0);
2488 return ERR_PTR(err
);
2491 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2492 SKB_GSO_CB(skb
)->encap_level
= 0;
2494 skb_reset_mac_header(skb
);
2495 skb_reset_mac_len(skb
);
2497 return skb_mac_gso_segment(skb
, features
);
2499 EXPORT_SYMBOL(__skb_gso_segment
);
2501 /* Take action when hardware reception checksum errors are detected. */
2503 void netdev_rx_csum_fault(struct net_device
*dev
)
2505 if (net_ratelimit()) {
2506 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2510 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2513 /* Actually, we should eliminate this check as soon as we know, that:
2514 * 1. IOMMU is present and allows to map all the memory.
2515 * 2. No high memory really exists on this machine.
2518 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2520 #ifdef CONFIG_HIGHMEM
2522 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2523 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2524 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2525 if (PageHighMem(skb_frag_page(frag
)))
2530 if (PCI_DMA_BUS_IS_PHYS
) {
2531 struct device
*pdev
= dev
->dev
.parent
;
2535 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2536 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2537 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2538 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2546 /* If MPLS offload request, verify we are testing hardware MPLS features
2547 * instead of standard features for the netdev.
2549 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2550 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2551 netdev_features_t features
,
2554 if (eth_p_mpls(type
))
2555 features
&= skb
->dev
->mpls_features
;
2560 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2561 netdev_features_t features
,
2568 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2569 netdev_features_t features
)
2574 type
= skb_network_protocol(skb
, &tmp
);
2575 features
= net_mpls_features(skb
, features
, type
);
2577 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2578 !can_checksum_protocol(features
, type
)) {
2579 features
&= ~NETIF_F_ALL_CSUM
;
2580 } else if (illegal_highdma(skb
->dev
, skb
)) {
2581 features
&= ~NETIF_F_SG
;
2587 netdev_features_t
passthru_features_check(struct sk_buff
*skb
,
2588 struct net_device
*dev
,
2589 netdev_features_t features
)
2593 EXPORT_SYMBOL(passthru_features_check
);
2595 static netdev_features_t
dflt_features_check(const struct sk_buff
*skb
,
2596 struct net_device
*dev
,
2597 netdev_features_t features
)
2599 return vlan_features_check(skb
, features
);
2602 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2604 struct net_device
*dev
= skb
->dev
;
2605 netdev_features_t features
= dev
->features
;
2606 u16 gso_segs
= skb_shinfo(skb
)->gso_segs
;
2608 if (gso_segs
> dev
->gso_max_segs
|| gso_segs
< dev
->gso_min_segs
)
2609 features
&= ~NETIF_F_GSO_MASK
;
2611 /* If encapsulation offload request, verify we are testing
2612 * hardware encapsulation features instead of standard
2613 * features for the netdev
2615 if (skb
->encapsulation
)
2616 features
&= dev
->hw_enc_features
;
2618 if (skb_vlan_tagged(skb
))
2619 features
= netdev_intersect_features(features
,
2620 dev
->vlan_features
|
2621 NETIF_F_HW_VLAN_CTAG_TX
|
2622 NETIF_F_HW_VLAN_STAG_TX
);
2624 if (dev
->netdev_ops
->ndo_features_check
)
2625 features
&= dev
->netdev_ops
->ndo_features_check(skb
, dev
,
2628 features
&= dflt_features_check(skb
, dev
, features
);
2630 return harmonize_features(skb
, features
);
2632 EXPORT_SYMBOL(netif_skb_features
);
2634 static int xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
2635 struct netdev_queue
*txq
, bool more
)
2640 if (!list_empty(&ptype_all
) || !list_empty(&dev
->ptype_all
))
2641 dev_queue_xmit_nit(skb
, dev
);
2644 trace_net_dev_start_xmit(skb
, dev
);
2645 rc
= netdev_start_xmit(skb
, dev
, txq
, more
);
2646 trace_net_dev_xmit(skb
, rc
, dev
, len
);
2651 struct sk_buff
*dev_hard_start_xmit(struct sk_buff
*first
, struct net_device
*dev
,
2652 struct netdev_queue
*txq
, int *ret
)
2654 struct sk_buff
*skb
= first
;
2655 int rc
= NETDEV_TX_OK
;
2658 struct sk_buff
*next
= skb
->next
;
2661 rc
= xmit_one(skb
, dev
, txq
, next
!= NULL
);
2662 if (unlikely(!dev_xmit_complete(rc
))) {
2668 if (netif_xmit_stopped(txq
) && skb
) {
2669 rc
= NETDEV_TX_BUSY
;
2679 static struct sk_buff
*validate_xmit_vlan(struct sk_buff
*skb
,
2680 netdev_features_t features
)
2682 if (skb_vlan_tag_present(skb
) &&
2683 !vlan_hw_offload_capable(features
, skb
->vlan_proto
))
2684 skb
= __vlan_hwaccel_push_inside(skb
);
2688 static struct sk_buff
*validate_xmit_skb(struct sk_buff
*skb
, struct net_device
*dev
)
2690 netdev_features_t features
;
2695 features
= netif_skb_features(skb
);
2696 skb
= validate_xmit_vlan(skb
, features
);
2700 if (netif_needs_gso(dev
, skb
, features
)) {
2701 struct sk_buff
*segs
;
2703 segs
= skb_gso_segment(skb
, features
);
2711 if (skb_needs_linearize(skb
, features
) &&
2712 __skb_linearize(skb
))
2715 /* If packet is not checksummed and device does not
2716 * support checksumming for this protocol, complete
2717 * checksumming here.
2719 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2720 if (skb
->encapsulation
)
2721 skb_set_inner_transport_header(skb
,
2722 skb_checksum_start_offset(skb
));
2724 skb_set_transport_header(skb
,
2725 skb_checksum_start_offset(skb
));
2726 if (!(features
& NETIF_F_ALL_CSUM
) &&
2727 skb_checksum_help(skb
))
2740 struct sk_buff
*validate_xmit_skb_list(struct sk_buff
*skb
, struct net_device
*dev
)
2742 struct sk_buff
*next
, *head
= NULL
, *tail
;
2744 for (; skb
!= NULL
; skb
= next
) {
2748 /* in case skb wont be segmented, point to itself */
2751 skb
= validate_xmit_skb(skb
, dev
);
2759 /* If skb was segmented, skb->prev points to
2760 * the last segment. If not, it still contains skb.
2767 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2769 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2771 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2773 /* To get more precise estimation of bytes sent on wire,
2774 * we add to pkt_len the headers size of all segments
2776 if (shinfo
->gso_size
) {
2777 unsigned int hdr_len
;
2778 u16 gso_segs
= shinfo
->gso_segs
;
2780 /* mac layer + network layer */
2781 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2783 /* + transport layer */
2784 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2785 hdr_len
+= tcp_hdrlen(skb
);
2787 hdr_len
+= sizeof(struct udphdr
);
2789 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2790 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2793 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2797 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2798 struct net_device
*dev
,
2799 struct netdev_queue
*txq
)
2801 spinlock_t
*root_lock
= qdisc_lock(q
);
2805 qdisc_pkt_len_init(skb
);
2806 qdisc_calculate_pkt_len(skb
, q
);
2808 * Heuristic to force contended enqueues to serialize on a
2809 * separate lock before trying to get qdisc main lock.
2810 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2811 * often and dequeue packets faster.
2813 contended
= qdisc_is_running(q
);
2814 if (unlikely(contended
))
2815 spin_lock(&q
->busylock
);
2817 spin_lock(root_lock
);
2818 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2821 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2822 qdisc_run_begin(q
)) {
2824 * This is a work-conserving queue; there are no old skbs
2825 * waiting to be sent out; and the qdisc is not running -
2826 * xmit the skb directly.
2829 qdisc_bstats_update(q
, skb
);
2831 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
, true)) {
2832 if (unlikely(contended
)) {
2833 spin_unlock(&q
->busylock
);
2840 rc
= NET_XMIT_SUCCESS
;
2842 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2843 if (qdisc_run_begin(q
)) {
2844 if (unlikely(contended
)) {
2845 spin_unlock(&q
->busylock
);
2851 spin_unlock(root_lock
);
2852 if (unlikely(contended
))
2853 spin_unlock(&q
->busylock
);
2857 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2858 static void skb_update_prio(struct sk_buff
*skb
)
2860 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2862 if (!skb
->priority
&& skb
->sk
&& map
) {
2863 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2865 if (prioidx
< map
->priomap_len
)
2866 skb
->priority
= map
->priomap
[prioidx
];
2870 #define skb_update_prio(skb)
2873 static DEFINE_PER_CPU(int, xmit_recursion
);
2874 #define RECURSION_LIMIT 10
2877 * dev_loopback_xmit - loop back @skb
2878 * @skb: buffer to transmit
2880 int dev_loopback_xmit(struct sk_buff
*skb
)
2882 skb_reset_mac_header(skb
);
2883 __skb_pull(skb
, skb_network_offset(skb
));
2884 skb
->pkt_type
= PACKET_LOOPBACK
;
2885 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2886 WARN_ON(!skb_dst(skb
));
2891 EXPORT_SYMBOL(dev_loopback_xmit
);
2894 * __dev_queue_xmit - transmit a buffer
2895 * @skb: buffer to transmit
2896 * @accel_priv: private data used for L2 forwarding offload
2898 * Queue a buffer for transmission to a network device. The caller must
2899 * have set the device and priority and built the buffer before calling
2900 * this function. The function can be called from an interrupt.
2902 * A negative errno code is returned on a failure. A success does not
2903 * guarantee the frame will be transmitted as it may be dropped due
2904 * to congestion or traffic shaping.
2906 * -----------------------------------------------------------------------------------
2907 * I notice this method can also return errors from the queue disciplines,
2908 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2911 * Regardless of the return value, the skb is consumed, so it is currently
2912 * difficult to retry a send to this method. (You can bump the ref count
2913 * before sending to hold a reference for retry if you are careful.)
2915 * When calling this method, interrupts MUST be enabled. This is because
2916 * the BH enable code must have IRQs enabled so that it will not deadlock.
2919 static int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
2921 struct net_device
*dev
= skb
->dev
;
2922 struct netdev_queue
*txq
;
2926 skb_reset_mac_header(skb
);
2928 if (unlikely(skb_shinfo(skb
)->tx_flags
& SKBTX_SCHED_TSTAMP
))
2929 __skb_tstamp_tx(skb
, NULL
, skb
->sk
, SCM_TSTAMP_SCHED
);
2931 /* Disable soft irqs for various locks below. Also
2932 * stops preemption for RCU.
2936 skb_update_prio(skb
);
2938 /* If device/qdisc don't need skb->dst, release it right now while
2939 * its hot in this cpu cache.
2941 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2946 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
2947 q
= rcu_dereference_bh(txq
->qdisc
);
2949 #ifdef CONFIG_NET_CLS_ACT
2950 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2952 trace_net_dev_queue(skb
);
2954 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2958 /* The device has no queue. Common case for software devices:
2959 loopback, all the sorts of tunnels...
2961 Really, it is unlikely that netif_tx_lock protection is necessary
2962 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2964 However, it is possible, that they rely on protection
2967 Check this and shot the lock. It is not prone from deadlocks.
2968 Either shot noqueue qdisc, it is even simpler 8)
2970 if (dev
->flags
& IFF_UP
) {
2971 int cpu
= smp_processor_id(); /* ok because BHs are off */
2973 if (txq
->xmit_lock_owner
!= cpu
) {
2975 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2976 goto recursion_alert
;
2978 skb
= validate_xmit_skb(skb
, dev
);
2982 HARD_TX_LOCK(dev
, txq
, cpu
);
2984 if (!netif_xmit_stopped(txq
)) {
2985 __this_cpu_inc(xmit_recursion
);
2986 skb
= dev_hard_start_xmit(skb
, dev
, txq
, &rc
);
2987 __this_cpu_dec(xmit_recursion
);
2988 if (dev_xmit_complete(rc
)) {
2989 HARD_TX_UNLOCK(dev
, txq
);
2993 HARD_TX_UNLOCK(dev
, txq
);
2994 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2997 /* Recursion is detected! It is possible,
3001 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3008 rcu_read_unlock_bh();
3010 atomic_long_inc(&dev
->tx_dropped
);
3011 kfree_skb_list(skb
);
3014 rcu_read_unlock_bh();
3018 int dev_queue_xmit(struct sk_buff
*skb
)
3020 return __dev_queue_xmit(skb
, NULL
);
3022 EXPORT_SYMBOL(dev_queue_xmit
);
3024 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
3026 return __dev_queue_xmit(skb
, accel_priv
);
3028 EXPORT_SYMBOL(dev_queue_xmit_accel
);
3031 /*=======================================================================
3033 =======================================================================*/
3035 int netdev_max_backlog __read_mostly
= 1000;
3036 EXPORT_SYMBOL(netdev_max_backlog
);
3038 int netdev_tstamp_prequeue __read_mostly
= 1;
3039 int netdev_budget __read_mostly
= 300;
3040 int weight_p __read_mostly
= 64; /* old backlog weight */
3042 /* Called with irq disabled */
3043 static inline void ____napi_schedule(struct softnet_data
*sd
,
3044 struct napi_struct
*napi
)
3046 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
3047 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3052 /* One global table that all flow-based protocols share. */
3053 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
3054 EXPORT_SYMBOL(rps_sock_flow_table
);
3055 u32 rps_cpu_mask __read_mostly
;
3056 EXPORT_SYMBOL(rps_cpu_mask
);
3058 struct static_key rps_needed __read_mostly
;
3060 static struct rps_dev_flow
*
3061 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3062 struct rps_dev_flow
*rflow
, u16 next_cpu
)
3064 if (next_cpu
!= RPS_NO_CPU
) {
3065 #ifdef CONFIG_RFS_ACCEL
3066 struct netdev_rx_queue
*rxqueue
;
3067 struct rps_dev_flow_table
*flow_table
;
3068 struct rps_dev_flow
*old_rflow
;
3073 /* Should we steer this flow to a different hardware queue? */
3074 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
3075 !(dev
->features
& NETIF_F_NTUPLE
))
3077 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
3078 if (rxq_index
== skb_get_rx_queue(skb
))
3081 rxqueue
= dev
->_rx
+ rxq_index
;
3082 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3085 flow_id
= skb_get_hash(skb
) & flow_table
->mask
;
3086 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
3087 rxq_index
, flow_id
);
3091 rflow
= &flow_table
->flows
[flow_id
];
3093 if (old_rflow
->filter
== rflow
->filter
)
3094 old_rflow
->filter
= RPS_NO_FILTER
;
3098 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
3101 rflow
->cpu
= next_cpu
;
3106 * get_rps_cpu is called from netif_receive_skb and returns the target
3107 * CPU from the RPS map of the receiving queue for a given skb.
3108 * rcu_read_lock must be held on entry.
3110 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3111 struct rps_dev_flow
**rflowp
)
3113 const struct rps_sock_flow_table
*sock_flow_table
;
3114 struct netdev_rx_queue
*rxqueue
= dev
->_rx
;
3115 struct rps_dev_flow_table
*flow_table
;
3116 struct rps_map
*map
;
3121 if (skb_rx_queue_recorded(skb
)) {
3122 u16 index
= skb_get_rx_queue(skb
);
3124 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
3125 WARN_ONCE(dev
->real_num_rx_queues
> 1,
3126 "%s received packet on queue %u, but number "
3127 "of RX queues is %u\n",
3128 dev
->name
, index
, dev
->real_num_rx_queues
);
3134 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3136 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3137 map
= rcu_dereference(rxqueue
->rps_map
);
3138 if (!flow_table
&& !map
)
3141 skb_reset_network_header(skb
);
3142 hash
= skb_get_hash(skb
);
3146 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3147 if (flow_table
&& sock_flow_table
) {
3148 struct rps_dev_flow
*rflow
;
3152 /* First check into global flow table if there is a match */
3153 ident
= sock_flow_table
->ents
[hash
& sock_flow_table
->mask
];
3154 if ((ident
^ hash
) & ~rps_cpu_mask
)
3157 next_cpu
= ident
& rps_cpu_mask
;
3159 /* OK, now we know there is a match,
3160 * we can look at the local (per receive queue) flow table
3162 rflow
= &flow_table
->flows
[hash
& flow_table
->mask
];
3166 * If the desired CPU (where last recvmsg was done) is
3167 * different from current CPU (one in the rx-queue flow
3168 * table entry), switch if one of the following holds:
3169 * - Current CPU is unset (equal to RPS_NO_CPU).
3170 * - Current CPU is offline.
3171 * - The current CPU's queue tail has advanced beyond the
3172 * last packet that was enqueued using this table entry.
3173 * This guarantees that all previous packets for the flow
3174 * have been dequeued, thus preserving in order delivery.
3176 if (unlikely(tcpu
!= next_cpu
) &&
3177 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
3178 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3179 rflow
->last_qtail
)) >= 0)) {
3181 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3184 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
3194 tcpu
= map
->cpus
[reciprocal_scale(hash
, map
->len
)];
3195 if (cpu_online(tcpu
)) {
3205 #ifdef CONFIG_RFS_ACCEL
3208 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3209 * @dev: Device on which the filter was set
3210 * @rxq_index: RX queue index
3211 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3212 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3214 * Drivers that implement ndo_rx_flow_steer() should periodically call
3215 * this function for each installed filter and remove the filters for
3216 * which it returns %true.
3218 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3219 u32 flow_id
, u16 filter_id
)
3221 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3222 struct rps_dev_flow_table
*flow_table
;
3223 struct rps_dev_flow
*rflow
;
3228 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3229 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3230 rflow
= &flow_table
->flows
[flow_id
];
3231 cpu
= ACCESS_ONCE(rflow
->cpu
);
3232 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
3233 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3234 rflow
->last_qtail
) <
3235 (int)(10 * flow_table
->mask
)))
3241 EXPORT_SYMBOL(rps_may_expire_flow
);
3243 #endif /* CONFIG_RFS_ACCEL */
3245 /* Called from hardirq (IPI) context */
3246 static void rps_trigger_softirq(void *data
)
3248 struct softnet_data
*sd
= data
;
3250 ____napi_schedule(sd
, &sd
->backlog
);
3254 #endif /* CONFIG_RPS */
3257 * Check if this softnet_data structure is another cpu one
3258 * If yes, queue it to our IPI list and return 1
3261 static int rps_ipi_queued(struct softnet_data
*sd
)
3264 struct softnet_data
*mysd
= this_cpu_ptr(&softnet_data
);
3267 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3268 mysd
->rps_ipi_list
= sd
;
3270 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3273 #endif /* CONFIG_RPS */
3277 #ifdef CONFIG_NET_FLOW_LIMIT
3278 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3281 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3283 #ifdef CONFIG_NET_FLOW_LIMIT
3284 struct sd_flow_limit
*fl
;
3285 struct softnet_data
*sd
;
3286 unsigned int old_flow
, new_flow
;
3288 if (qlen
< (netdev_max_backlog
>> 1))
3291 sd
= this_cpu_ptr(&softnet_data
);
3294 fl
= rcu_dereference(sd
->flow_limit
);
3296 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3297 old_flow
= fl
->history
[fl
->history_head
];
3298 fl
->history
[fl
->history_head
] = new_flow
;
3301 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3303 if (likely(fl
->buckets
[old_flow
]))
3304 fl
->buckets
[old_flow
]--;
3306 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3318 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3319 * queue (may be a remote CPU queue).
3321 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3322 unsigned int *qtail
)
3324 struct softnet_data
*sd
;
3325 unsigned long flags
;
3328 sd
= &per_cpu(softnet_data
, cpu
);
3330 local_irq_save(flags
);
3333 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3334 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3337 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3338 input_queue_tail_incr_save(sd
, qtail
);
3340 local_irq_restore(flags
);
3341 return NET_RX_SUCCESS
;
3344 /* Schedule NAPI for backlog device
3345 * We can use non atomic operation since we own the queue lock
3347 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3348 if (!rps_ipi_queued(sd
))
3349 ____napi_schedule(sd
, &sd
->backlog
);
3357 local_irq_restore(flags
);
3359 atomic_long_inc(&skb
->dev
->rx_dropped
);
3364 static int netif_rx_internal(struct sk_buff
*skb
)
3368 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3370 trace_netif_rx(skb
);
3372 if (static_key_false(&rps_needed
)) {
3373 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3379 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3381 cpu
= smp_processor_id();
3383 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3391 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3398 * netif_rx - post buffer to the network code
3399 * @skb: buffer to post
3401 * This function receives a packet from a device driver and queues it for
3402 * the upper (protocol) levels to process. It always succeeds. The buffer
3403 * may be dropped during processing for congestion control or by the
3407 * NET_RX_SUCCESS (no congestion)
3408 * NET_RX_DROP (packet was dropped)
3412 int netif_rx(struct sk_buff
*skb
)
3414 trace_netif_rx_entry(skb
);
3416 return netif_rx_internal(skb
);
3418 EXPORT_SYMBOL(netif_rx
);
3420 int netif_rx_ni(struct sk_buff
*skb
)
3424 trace_netif_rx_ni_entry(skb
);
3427 err
= netif_rx_internal(skb
);
3428 if (local_softirq_pending())
3434 EXPORT_SYMBOL(netif_rx_ni
);
3436 static void net_tx_action(struct softirq_action
*h
)
3438 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
3440 if (sd
->completion_queue
) {
3441 struct sk_buff
*clist
;
3443 local_irq_disable();
3444 clist
= sd
->completion_queue
;
3445 sd
->completion_queue
= NULL
;
3449 struct sk_buff
*skb
= clist
;
3450 clist
= clist
->next
;
3452 WARN_ON(atomic_read(&skb
->users
));
3453 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
3454 trace_consume_skb(skb
);
3456 trace_kfree_skb(skb
, net_tx_action
);
3461 if (sd
->output_queue
) {
3464 local_irq_disable();
3465 head
= sd
->output_queue
;
3466 sd
->output_queue
= NULL
;
3467 sd
->output_queue_tailp
= &sd
->output_queue
;
3471 struct Qdisc
*q
= head
;
3472 spinlock_t
*root_lock
;
3474 head
= head
->next_sched
;
3476 root_lock
= qdisc_lock(q
);
3477 if (spin_trylock(root_lock
)) {
3478 smp_mb__before_atomic();
3479 clear_bit(__QDISC_STATE_SCHED
,
3482 spin_unlock(root_lock
);
3484 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3486 __netif_reschedule(q
);
3488 smp_mb__before_atomic();
3489 clear_bit(__QDISC_STATE_SCHED
,
3497 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3498 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3499 /* This hook is defined here for ATM LANE */
3500 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3501 unsigned char *addr
) __read_mostly
;
3502 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3505 #ifdef CONFIG_NET_CLS_ACT
3506 /* TODO: Maybe we should just force sch_ingress to be compiled in
3507 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3508 * a compare and 2 stores extra right now if we dont have it on
3509 * but have CONFIG_NET_CLS_ACT
3510 * NOTE: This doesn't stop any functionality; if you dont have
3511 * the ingress scheduler, you just can't add policies on ingress.
3514 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3516 struct net_device
*dev
= skb
->dev
;
3517 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3518 int result
= TC_ACT_OK
;
3521 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3522 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3523 skb
->skb_iif
, dev
->ifindex
);
3527 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3528 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3530 q
= rcu_dereference(rxq
->qdisc
);
3531 if (q
!= &noop_qdisc
) {
3532 spin_lock(qdisc_lock(q
));
3533 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3534 result
= qdisc_enqueue_root(skb
, q
);
3535 spin_unlock(qdisc_lock(q
));
3541 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3542 struct packet_type
**pt_prev
,
3543 int *ret
, struct net_device
*orig_dev
)
3545 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3547 if (!rxq
|| rcu_access_pointer(rxq
->qdisc
) == &noop_qdisc
)
3551 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3555 switch (ing_filter(skb
, rxq
)) {
3569 * netdev_rx_handler_register - register receive handler
3570 * @dev: device to register a handler for
3571 * @rx_handler: receive handler to register
3572 * @rx_handler_data: data pointer that is used by rx handler
3574 * Register a receive handler for a device. This handler will then be
3575 * called from __netif_receive_skb. A negative errno code is returned
3578 * The caller must hold the rtnl_mutex.
3580 * For a general description of rx_handler, see enum rx_handler_result.
3582 int netdev_rx_handler_register(struct net_device
*dev
,
3583 rx_handler_func_t
*rx_handler
,
3584 void *rx_handler_data
)
3588 if (dev
->rx_handler
)
3591 /* Note: rx_handler_data must be set before rx_handler */
3592 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3593 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3597 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3600 * netdev_rx_handler_unregister - unregister receive handler
3601 * @dev: device to unregister a handler from
3603 * Unregister a receive handler from a device.
3605 * The caller must hold the rtnl_mutex.
3607 void netdev_rx_handler_unregister(struct net_device
*dev
)
3611 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3612 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3613 * section has a guarantee to see a non NULL rx_handler_data
3617 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3619 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3622 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3623 * the special handling of PFMEMALLOC skbs.
3625 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3627 switch (skb
->protocol
) {
3628 case htons(ETH_P_ARP
):
3629 case htons(ETH_P_IP
):
3630 case htons(ETH_P_IPV6
):
3631 case htons(ETH_P_8021Q
):
3632 case htons(ETH_P_8021AD
):
3639 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3641 struct packet_type
*ptype
, *pt_prev
;
3642 rx_handler_func_t
*rx_handler
;
3643 struct net_device
*orig_dev
;
3644 bool deliver_exact
= false;
3645 int ret
= NET_RX_DROP
;
3648 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3650 trace_netif_receive_skb(skb
);
3652 orig_dev
= skb
->dev
;
3654 skb_reset_network_header(skb
);
3655 if (!skb_transport_header_was_set(skb
))
3656 skb_reset_transport_header(skb
);
3657 skb_reset_mac_len(skb
);
3664 skb
->skb_iif
= skb
->dev
->ifindex
;
3666 __this_cpu_inc(softnet_data
.processed
);
3668 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
3669 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
3670 skb
= skb_vlan_untag(skb
);
3675 #ifdef CONFIG_NET_CLS_ACT
3676 if (skb
->tc_verd
& TC_NCLS
) {
3677 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3685 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3687 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3691 list_for_each_entry_rcu(ptype
, &skb
->dev
->ptype_all
, list
) {
3693 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3698 #ifdef CONFIG_NET_CLS_ACT
3699 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3705 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3708 if (skb_vlan_tag_present(skb
)) {
3710 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3713 if (vlan_do_receive(&skb
))
3715 else if (unlikely(!skb
))
3719 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3722 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3725 switch (rx_handler(&skb
)) {
3726 case RX_HANDLER_CONSUMED
:
3727 ret
= NET_RX_SUCCESS
;
3729 case RX_HANDLER_ANOTHER
:
3731 case RX_HANDLER_EXACT
:
3732 deliver_exact
= true;
3733 case RX_HANDLER_PASS
:
3740 if (unlikely(skb_vlan_tag_present(skb
))) {
3741 if (skb_vlan_tag_get_id(skb
))
3742 skb
->pkt_type
= PACKET_OTHERHOST
;
3743 /* Note: we might in the future use prio bits
3744 * and set skb->priority like in vlan_do_receive()
3745 * For the time being, just ignore Priority Code Point
3750 type
= skb
->protocol
;
3752 /* deliver only exact match when indicated */
3753 if (likely(!deliver_exact
)) {
3754 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3755 &ptype_base
[ntohs(type
) &
3759 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3760 &orig_dev
->ptype_specific
);
3762 if (unlikely(skb
->dev
!= orig_dev
)) {
3763 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3764 &skb
->dev
->ptype_specific
);
3768 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3771 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3774 atomic_long_inc(&skb
->dev
->rx_dropped
);
3776 /* Jamal, now you will not able to escape explaining
3777 * me how you were going to use this. :-)
3787 static int __netif_receive_skb(struct sk_buff
*skb
)
3791 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3792 unsigned long pflags
= current
->flags
;
3795 * PFMEMALLOC skbs are special, they should
3796 * - be delivered to SOCK_MEMALLOC sockets only
3797 * - stay away from userspace
3798 * - have bounded memory usage
3800 * Use PF_MEMALLOC as this saves us from propagating the allocation
3801 * context down to all allocation sites.
3803 current
->flags
|= PF_MEMALLOC
;
3804 ret
= __netif_receive_skb_core(skb
, true);
3805 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3807 ret
= __netif_receive_skb_core(skb
, false);
3812 static int netif_receive_skb_internal(struct sk_buff
*skb
)
3814 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3816 if (skb_defer_rx_timestamp(skb
))
3817 return NET_RX_SUCCESS
;
3820 if (static_key_false(&rps_needed
)) {
3821 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3826 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3829 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3836 return __netif_receive_skb(skb
);
3840 * netif_receive_skb - process receive buffer from network
3841 * @skb: buffer to process
3843 * netif_receive_skb() is the main receive data processing function.
3844 * It always succeeds. The buffer may be dropped during processing
3845 * for congestion control or by the protocol layers.
3847 * This function may only be called from softirq context and interrupts
3848 * should be enabled.
3850 * Return values (usually ignored):
3851 * NET_RX_SUCCESS: no congestion
3852 * NET_RX_DROP: packet was dropped
3854 int netif_receive_skb(struct sk_buff
*skb
)
3856 trace_netif_receive_skb_entry(skb
);
3858 return netif_receive_skb_internal(skb
);
3860 EXPORT_SYMBOL(netif_receive_skb
);
3862 /* Network device is going away, flush any packets still pending
3863 * Called with irqs disabled.
3865 static void flush_backlog(void *arg
)
3867 struct net_device
*dev
= arg
;
3868 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
3869 struct sk_buff
*skb
, *tmp
;
3872 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3873 if (skb
->dev
== dev
) {
3874 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3876 input_queue_head_incr(sd
);
3881 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3882 if (skb
->dev
== dev
) {
3883 __skb_unlink(skb
, &sd
->process_queue
);
3885 input_queue_head_incr(sd
);
3890 static int napi_gro_complete(struct sk_buff
*skb
)
3892 struct packet_offload
*ptype
;
3893 __be16 type
= skb
->protocol
;
3894 struct list_head
*head
= &offload_base
;
3897 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
3899 if (NAPI_GRO_CB(skb
)->count
== 1) {
3900 skb_shinfo(skb
)->gso_size
= 0;
3905 list_for_each_entry_rcu(ptype
, head
, list
) {
3906 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
3909 err
= ptype
->callbacks
.gro_complete(skb
, 0);
3915 WARN_ON(&ptype
->list
== head
);
3917 return NET_RX_SUCCESS
;
3921 return netif_receive_skb_internal(skb
);
3924 /* napi->gro_list contains packets ordered by age.
3925 * youngest packets at the head of it.
3926 * Complete skbs in reverse order to reduce latencies.
3928 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
3930 struct sk_buff
*skb
, *prev
= NULL
;
3932 /* scan list and build reverse chain */
3933 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
3938 for (skb
= prev
; skb
; skb
= prev
) {
3941 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
3945 napi_gro_complete(skb
);
3949 napi
->gro_list
= NULL
;
3951 EXPORT_SYMBOL(napi_gro_flush
);
3953 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
3956 unsigned int maclen
= skb
->dev
->hard_header_len
;
3957 u32 hash
= skb_get_hash_raw(skb
);
3959 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3960 unsigned long diffs
;
3962 NAPI_GRO_CB(p
)->flush
= 0;
3964 if (hash
!= skb_get_hash_raw(p
)) {
3965 NAPI_GRO_CB(p
)->same_flow
= 0;
3969 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3970 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3971 if (maclen
== ETH_HLEN
)
3972 diffs
|= compare_ether_header(skb_mac_header(p
),
3973 skb_mac_header(skb
));
3975 diffs
= memcmp(skb_mac_header(p
),
3976 skb_mac_header(skb
),
3978 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3982 static void skb_gro_reset_offset(struct sk_buff
*skb
)
3984 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3985 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
3987 NAPI_GRO_CB(skb
)->data_offset
= 0;
3988 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3989 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3991 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
3993 !PageHighMem(skb_frag_page(frag0
))) {
3994 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
3995 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
3999 static void gro_pull_from_frag0(struct sk_buff
*skb
, int grow
)
4001 struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4003 BUG_ON(skb
->end
- skb
->tail
< grow
);
4005 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
4007 skb
->data_len
-= grow
;
4010 pinfo
->frags
[0].page_offset
+= grow
;
4011 skb_frag_size_sub(&pinfo
->frags
[0], grow
);
4013 if (unlikely(!skb_frag_size(&pinfo
->frags
[0]))) {
4014 skb_frag_unref(skb
, 0);
4015 memmove(pinfo
->frags
, pinfo
->frags
+ 1,
4016 --pinfo
->nr_frags
* sizeof(pinfo
->frags
[0]));
4020 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4022 struct sk_buff
**pp
= NULL
;
4023 struct packet_offload
*ptype
;
4024 __be16 type
= skb
->protocol
;
4025 struct list_head
*head
= &offload_base
;
4027 enum gro_result ret
;
4030 if (!(skb
->dev
->features
& NETIF_F_GRO
))
4033 if (skb_is_gso(skb
) || skb_has_frag_list(skb
) || skb
->csum_bad
)
4036 gro_list_prepare(napi
, skb
);
4039 list_for_each_entry_rcu(ptype
, head
, list
) {
4040 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4043 skb_set_network_header(skb
, skb_gro_offset(skb
));
4044 skb_reset_mac_len(skb
);
4045 NAPI_GRO_CB(skb
)->same_flow
= 0;
4046 NAPI_GRO_CB(skb
)->flush
= 0;
4047 NAPI_GRO_CB(skb
)->free
= 0;
4048 NAPI_GRO_CB(skb
)->udp_mark
= 0;
4049 NAPI_GRO_CB(skb
)->gro_remcsum_start
= 0;
4051 /* Setup for GRO checksum validation */
4052 switch (skb
->ip_summed
) {
4053 case CHECKSUM_COMPLETE
:
4054 NAPI_GRO_CB(skb
)->csum
= skb
->csum
;
4055 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4056 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4058 case CHECKSUM_UNNECESSARY
:
4059 NAPI_GRO_CB(skb
)->csum_cnt
= skb
->csum_level
+ 1;
4060 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4063 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4064 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4067 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
4072 if (&ptype
->list
== head
)
4075 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
4076 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
4079 struct sk_buff
*nskb
= *pp
;
4083 napi_gro_complete(nskb
);
4090 if (NAPI_GRO_CB(skb
)->flush
)
4093 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
4094 struct sk_buff
*nskb
= napi
->gro_list
;
4096 /* locate the end of the list to select the 'oldest' flow */
4097 while (nskb
->next
) {
4103 napi_gro_complete(nskb
);
4107 NAPI_GRO_CB(skb
)->count
= 1;
4108 NAPI_GRO_CB(skb
)->age
= jiffies
;
4109 NAPI_GRO_CB(skb
)->last
= skb
;
4110 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
4111 skb
->next
= napi
->gro_list
;
4112 napi
->gro_list
= skb
;
4116 grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
4118 gro_pull_from_frag0(skb
, grow
);
4127 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
4129 struct list_head
*offload_head
= &offload_base
;
4130 struct packet_offload
*ptype
;
4132 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4133 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4139 EXPORT_SYMBOL(gro_find_receive_by_type
);
4141 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
4143 struct list_head
*offload_head
= &offload_base
;
4144 struct packet_offload
*ptype
;
4146 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4147 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4153 EXPORT_SYMBOL(gro_find_complete_by_type
);
4155 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
4159 if (netif_receive_skb_internal(skb
))
4167 case GRO_MERGED_FREE
:
4168 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
4169 kmem_cache_free(skbuff_head_cache
, skb
);
4182 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4184 trace_napi_gro_receive_entry(skb
);
4186 skb_gro_reset_offset(skb
);
4188 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4190 EXPORT_SYMBOL(napi_gro_receive
);
4192 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4194 if (unlikely(skb
->pfmemalloc
)) {
4198 __skb_pull(skb
, skb_headlen(skb
));
4199 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4200 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
4202 skb
->dev
= napi
->dev
;
4204 skb
->encapsulation
= 0;
4205 skb_shinfo(skb
)->gso_type
= 0;
4206 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
4211 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
4213 struct sk_buff
*skb
= napi
->skb
;
4216 skb
= napi_alloc_skb(napi
, GRO_MAX_HEAD
);
4221 EXPORT_SYMBOL(napi_get_frags
);
4223 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
4224 struct sk_buff
*skb
,
4230 __skb_push(skb
, ETH_HLEN
);
4231 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4232 if (ret
== GRO_NORMAL
&& netif_receive_skb_internal(skb
))
4237 case GRO_MERGED_FREE
:
4238 napi_reuse_skb(napi
, skb
);
4248 /* Upper GRO stack assumes network header starts at gro_offset=0
4249 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4250 * We copy ethernet header into skb->data to have a common layout.
4252 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4254 struct sk_buff
*skb
= napi
->skb
;
4255 const struct ethhdr
*eth
;
4256 unsigned int hlen
= sizeof(*eth
);
4260 skb_reset_mac_header(skb
);
4261 skb_gro_reset_offset(skb
);
4263 eth
= skb_gro_header_fast(skb
, 0);
4264 if (unlikely(skb_gro_header_hard(skb
, hlen
))) {
4265 eth
= skb_gro_header_slow(skb
, hlen
, 0);
4266 if (unlikely(!eth
)) {
4267 napi_reuse_skb(napi
, skb
);
4271 gro_pull_from_frag0(skb
, hlen
);
4272 NAPI_GRO_CB(skb
)->frag0
+= hlen
;
4273 NAPI_GRO_CB(skb
)->frag0_len
-= hlen
;
4275 __skb_pull(skb
, hlen
);
4278 * This works because the only protocols we care about don't require
4280 * We'll fix it up properly in napi_frags_finish()
4282 skb
->protocol
= eth
->h_proto
;
4287 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4289 struct sk_buff
*skb
= napi_frags_skb(napi
);
4294 trace_napi_gro_frags_entry(skb
);
4296 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4298 EXPORT_SYMBOL(napi_gro_frags
);
4300 /* Compute the checksum from gro_offset and return the folded value
4301 * after adding in any pseudo checksum.
4303 __sum16
__skb_gro_checksum_complete(struct sk_buff
*skb
)
4308 wsum
= skb_checksum(skb
, skb_gro_offset(skb
), skb_gro_len(skb
), 0);
4310 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4311 sum
= csum_fold(csum_add(NAPI_GRO_CB(skb
)->csum
, wsum
));
4313 if (unlikely(skb
->ip_summed
== CHECKSUM_COMPLETE
) &&
4314 !skb
->csum_complete_sw
)
4315 netdev_rx_csum_fault(skb
->dev
);
4318 NAPI_GRO_CB(skb
)->csum
= wsum
;
4319 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4323 EXPORT_SYMBOL(__skb_gro_checksum_complete
);
4326 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4327 * Note: called with local irq disabled, but exits with local irq enabled.
4329 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4332 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4335 sd
->rps_ipi_list
= NULL
;
4339 /* Send pending IPI's to kick RPS processing on remote cpus. */
4341 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4343 if (cpu_online(remsd
->cpu
))
4344 smp_call_function_single_async(remsd
->cpu
,
4353 static bool sd_has_rps_ipi_waiting(struct softnet_data
*sd
)
4356 return sd
->rps_ipi_list
!= NULL
;
4362 static int process_backlog(struct napi_struct
*napi
, int quota
)
4365 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4367 /* Check if we have pending ipi, its better to send them now,
4368 * not waiting net_rx_action() end.
4370 if (sd_has_rps_ipi_waiting(sd
)) {
4371 local_irq_disable();
4372 net_rps_action_and_irq_enable(sd
);
4375 napi
->weight
= weight_p
;
4376 local_irq_disable();
4378 struct sk_buff
*skb
;
4380 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4382 __netif_receive_skb(skb
);
4383 local_irq_disable();
4384 input_queue_head_incr(sd
);
4385 if (++work
>= quota
) {
4392 if (skb_queue_empty(&sd
->input_pkt_queue
)) {
4394 * Inline a custom version of __napi_complete().
4395 * only current cpu owns and manipulates this napi,
4396 * and NAPI_STATE_SCHED is the only possible flag set
4398 * We can use a plain write instead of clear_bit(),
4399 * and we dont need an smp_mb() memory barrier.
4407 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4408 &sd
->process_queue
);
4417 * __napi_schedule - schedule for receive
4418 * @n: entry to schedule
4420 * The entry's receive function will be scheduled to run.
4421 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4423 void __napi_schedule(struct napi_struct
*n
)
4425 unsigned long flags
;
4427 local_irq_save(flags
);
4428 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4429 local_irq_restore(flags
);
4431 EXPORT_SYMBOL(__napi_schedule
);
4434 * __napi_schedule_irqoff - schedule for receive
4435 * @n: entry to schedule
4437 * Variant of __napi_schedule() assuming hard irqs are masked
4439 void __napi_schedule_irqoff(struct napi_struct
*n
)
4441 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4443 EXPORT_SYMBOL(__napi_schedule_irqoff
);
4445 void __napi_complete(struct napi_struct
*n
)
4447 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4449 list_del_init(&n
->poll_list
);
4450 smp_mb__before_atomic();
4451 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4453 EXPORT_SYMBOL(__napi_complete
);
4455 void napi_complete_done(struct napi_struct
*n
, int work_done
)
4457 unsigned long flags
;
4460 * don't let napi dequeue from the cpu poll list
4461 * just in case its running on a different cpu
4463 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4467 unsigned long timeout
= 0;
4470 timeout
= n
->dev
->gro_flush_timeout
;
4473 hrtimer_start(&n
->timer
, ns_to_ktime(timeout
),
4474 HRTIMER_MODE_REL_PINNED
);
4476 napi_gro_flush(n
, false);
4478 if (likely(list_empty(&n
->poll_list
))) {
4479 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED
, &n
->state
));
4481 /* If n->poll_list is not empty, we need to mask irqs */
4482 local_irq_save(flags
);
4484 local_irq_restore(flags
);
4487 EXPORT_SYMBOL(napi_complete_done
);
4489 /* must be called under rcu_read_lock(), as we dont take a reference */
4490 struct napi_struct
*napi_by_id(unsigned int napi_id
)
4492 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4493 struct napi_struct
*napi
;
4495 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4496 if (napi
->napi_id
== napi_id
)
4501 EXPORT_SYMBOL_GPL(napi_by_id
);
4503 void napi_hash_add(struct napi_struct
*napi
)
4505 if (!test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
4507 spin_lock(&napi_hash_lock
);
4509 /* 0 is not a valid id, we also skip an id that is taken
4510 * we expect both events to be extremely rare
4513 while (!napi
->napi_id
) {
4514 napi
->napi_id
= ++napi_gen_id
;
4515 if (napi_by_id(napi
->napi_id
))
4519 hlist_add_head_rcu(&napi
->napi_hash_node
,
4520 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
4522 spin_unlock(&napi_hash_lock
);
4525 EXPORT_SYMBOL_GPL(napi_hash_add
);
4527 /* Warning : caller is responsible to make sure rcu grace period
4528 * is respected before freeing memory containing @napi
4530 void napi_hash_del(struct napi_struct
*napi
)
4532 spin_lock(&napi_hash_lock
);
4534 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
))
4535 hlist_del_rcu(&napi
->napi_hash_node
);
4537 spin_unlock(&napi_hash_lock
);
4539 EXPORT_SYMBOL_GPL(napi_hash_del
);
4541 static enum hrtimer_restart
napi_watchdog(struct hrtimer
*timer
)
4543 struct napi_struct
*napi
;
4545 napi
= container_of(timer
, struct napi_struct
, timer
);
4547 napi_schedule(napi
);
4549 return HRTIMER_NORESTART
;
4552 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4553 int (*poll
)(struct napi_struct
*, int), int weight
)
4555 INIT_LIST_HEAD(&napi
->poll_list
);
4556 hrtimer_init(&napi
->timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_REL_PINNED
);
4557 napi
->timer
.function
= napi_watchdog
;
4558 napi
->gro_count
= 0;
4559 napi
->gro_list
= NULL
;
4562 if (weight
> NAPI_POLL_WEIGHT
)
4563 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4565 napi
->weight
= weight
;
4566 list_add(&napi
->dev_list
, &dev
->napi_list
);
4568 #ifdef CONFIG_NETPOLL
4569 spin_lock_init(&napi
->poll_lock
);
4570 napi
->poll_owner
= -1;
4572 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4574 EXPORT_SYMBOL(netif_napi_add
);
4576 void napi_disable(struct napi_struct
*n
)
4579 set_bit(NAPI_STATE_DISABLE
, &n
->state
);
4581 while (test_and_set_bit(NAPI_STATE_SCHED
, &n
->state
))
4584 hrtimer_cancel(&n
->timer
);
4586 clear_bit(NAPI_STATE_DISABLE
, &n
->state
);
4588 EXPORT_SYMBOL(napi_disable
);
4590 void netif_napi_del(struct napi_struct
*napi
)
4592 list_del_init(&napi
->dev_list
);
4593 napi_free_frags(napi
);
4595 kfree_skb_list(napi
->gro_list
);
4596 napi
->gro_list
= NULL
;
4597 napi
->gro_count
= 0;
4599 EXPORT_SYMBOL(netif_napi_del
);
4601 static int napi_poll(struct napi_struct
*n
, struct list_head
*repoll
)
4606 list_del_init(&n
->poll_list
);
4608 have
= netpoll_poll_lock(n
);
4612 /* This NAPI_STATE_SCHED test is for avoiding a race
4613 * with netpoll's poll_napi(). Only the entity which
4614 * obtains the lock and sees NAPI_STATE_SCHED set will
4615 * actually make the ->poll() call. Therefore we avoid
4616 * accidentally calling ->poll() when NAPI is not scheduled.
4619 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4620 work
= n
->poll(n
, weight
);
4624 WARN_ON_ONCE(work
> weight
);
4626 if (likely(work
< weight
))
4629 /* Drivers must not modify the NAPI state if they
4630 * consume the entire weight. In such cases this code
4631 * still "owns" the NAPI instance and therefore can
4632 * move the instance around on the list at-will.
4634 if (unlikely(napi_disable_pending(n
))) {
4640 /* flush too old packets
4641 * If HZ < 1000, flush all packets.
4643 napi_gro_flush(n
, HZ
>= 1000);
4646 /* Some drivers may have called napi_schedule
4647 * prior to exhausting their budget.
4649 if (unlikely(!list_empty(&n
->poll_list
))) {
4650 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
4651 n
->dev
? n
->dev
->name
: "backlog");
4655 list_add_tail(&n
->poll_list
, repoll
);
4658 netpoll_poll_unlock(have
);
4663 static void net_rx_action(struct softirq_action
*h
)
4665 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4666 unsigned long time_limit
= jiffies
+ 2;
4667 int budget
= netdev_budget
;
4671 local_irq_disable();
4672 list_splice_init(&sd
->poll_list
, &list
);
4676 struct napi_struct
*n
;
4678 if (list_empty(&list
)) {
4679 if (!sd_has_rps_ipi_waiting(sd
) && list_empty(&repoll
))
4684 n
= list_first_entry(&list
, struct napi_struct
, poll_list
);
4685 budget
-= napi_poll(n
, &repoll
);
4687 /* If softirq window is exhausted then punt.
4688 * Allow this to run for 2 jiffies since which will allow
4689 * an average latency of 1.5/HZ.
4691 if (unlikely(budget
<= 0 ||
4692 time_after_eq(jiffies
, time_limit
))) {
4698 local_irq_disable();
4700 list_splice_tail_init(&sd
->poll_list
, &list
);
4701 list_splice_tail(&repoll
, &list
);
4702 list_splice(&list
, &sd
->poll_list
);
4703 if (!list_empty(&sd
->poll_list
))
4704 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4706 net_rps_action_and_irq_enable(sd
);
4709 struct netdev_adjacent
{
4710 struct net_device
*dev
;
4712 /* upper master flag, there can only be one master device per list */
4715 /* counter for the number of times this device was added to us */
4718 /* private field for the users */
4721 struct list_head list
;
4722 struct rcu_head rcu
;
4725 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*dev
,
4726 struct net_device
*adj_dev
,
4727 struct list_head
*adj_list
)
4729 struct netdev_adjacent
*adj
;
4731 list_for_each_entry(adj
, adj_list
, list
) {
4732 if (adj
->dev
== adj_dev
)
4739 * netdev_has_upper_dev - Check if device is linked to an upper device
4741 * @upper_dev: upper device to check
4743 * Find out if a device is linked to specified upper device and return true
4744 * in case it is. Note that this checks only immediate upper device,
4745 * not through a complete stack of devices. The caller must hold the RTNL lock.
4747 bool netdev_has_upper_dev(struct net_device
*dev
,
4748 struct net_device
*upper_dev
)
4752 return __netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
);
4754 EXPORT_SYMBOL(netdev_has_upper_dev
);
4757 * netdev_has_any_upper_dev - Check if device is linked to some device
4760 * Find out if a device is linked to an upper device and return true in case
4761 * it is. The caller must hold the RTNL lock.
4763 static bool netdev_has_any_upper_dev(struct net_device
*dev
)
4767 return !list_empty(&dev
->all_adj_list
.upper
);
4771 * netdev_master_upper_dev_get - Get master upper device
4774 * Find a master upper device and return pointer to it or NULL in case
4775 * it's not there. The caller must hold the RTNL lock.
4777 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4779 struct netdev_adjacent
*upper
;
4783 if (list_empty(&dev
->adj_list
.upper
))
4786 upper
= list_first_entry(&dev
->adj_list
.upper
,
4787 struct netdev_adjacent
, list
);
4788 if (likely(upper
->master
))
4792 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4794 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
4796 struct netdev_adjacent
*adj
;
4798 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
4800 return adj
->private;
4802 EXPORT_SYMBOL(netdev_adjacent_get_private
);
4805 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
4807 * @iter: list_head ** of the current position
4809 * Gets the next device from the dev's upper list, starting from iter
4810 * position. The caller must hold RCU read lock.
4812 struct net_device
*netdev_upper_get_next_dev_rcu(struct net_device
*dev
,
4813 struct list_head
**iter
)
4815 struct netdev_adjacent
*upper
;
4817 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4819 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4821 if (&upper
->list
== &dev
->adj_list
.upper
)
4824 *iter
= &upper
->list
;
4828 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu
);
4831 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4833 * @iter: list_head ** of the current position
4835 * Gets the next device from the dev's upper list, starting from iter
4836 * position. The caller must hold RCU read lock.
4838 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
4839 struct list_head
**iter
)
4841 struct netdev_adjacent
*upper
;
4843 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4845 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4847 if (&upper
->list
== &dev
->all_adj_list
.upper
)
4850 *iter
= &upper
->list
;
4854 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
4857 * netdev_lower_get_next_private - Get the next ->private from the
4858 * lower neighbour list
4860 * @iter: list_head ** of the current position
4862 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4863 * list, starting from iter position. The caller must hold either hold the
4864 * RTNL lock or its own locking that guarantees that the neighbour lower
4865 * list will remain unchainged.
4867 void *netdev_lower_get_next_private(struct net_device
*dev
,
4868 struct list_head
**iter
)
4870 struct netdev_adjacent
*lower
;
4872 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
4874 if (&lower
->list
== &dev
->adj_list
.lower
)
4877 *iter
= lower
->list
.next
;
4879 return lower
->private;
4881 EXPORT_SYMBOL(netdev_lower_get_next_private
);
4884 * netdev_lower_get_next_private_rcu - Get the next ->private from the
4885 * lower neighbour list, RCU
4888 * @iter: list_head ** of the current position
4890 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4891 * list, starting from iter position. The caller must hold RCU read lock.
4893 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
4894 struct list_head
**iter
)
4896 struct netdev_adjacent
*lower
;
4898 WARN_ON_ONCE(!rcu_read_lock_held());
4900 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4902 if (&lower
->list
== &dev
->adj_list
.lower
)
4905 *iter
= &lower
->list
;
4907 return lower
->private;
4909 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
4912 * netdev_lower_get_next - Get the next device from the lower neighbour
4915 * @iter: list_head ** of the current position
4917 * Gets the next netdev_adjacent from the dev's lower neighbour
4918 * list, starting from iter position. The caller must hold RTNL lock or
4919 * its own locking that guarantees that the neighbour lower
4920 * list will remain unchainged.
4922 void *netdev_lower_get_next(struct net_device
*dev
, struct list_head
**iter
)
4924 struct netdev_adjacent
*lower
;
4926 lower
= list_entry((*iter
)->next
, struct netdev_adjacent
, list
);
4928 if (&lower
->list
== &dev
->adj_list
.lower
)
4931 *iter
= &lower
->list
;
4935 EXPORT_SYMBOL(netdev_lower_get_next
);
4938 * netdev_lower_get_first_private_rcu - Get the first ->private from the
4939 * lower neighbour list, RCU
4943 * Gets the first netdev_adjacent->private from the dev's lower neighbour
4944 * list. The caller must hold RCU read lock.
4946 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
4948 struct netdev_adjacent
*lower
;
4950 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
4951 struct netdev_adjacent
, list
);
4953 return lower
->private;
4956 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
4959 * netdev_master_upper_dev_get_rcu - Get master upper device
4962 * Find a master upper device and return pointer to it or NULL in case
4963 * it's not there. The caller must hold the RCU read lock.
4965 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
4967 struct netdev_adjacent
*upper
;
4969 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
4970 struct netdev_adjacent
, list
);
4971 if (upper
&& likely(upper
->master
))
4975 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
4977 static int netdev_adjacent_sysfs_add(struct net_device
*dev
,
4978 struct net_device
*adj_dev
,
4979 struct list_head
*dev_list
)
4981 char linkname
[IFNAMSIZ
+7];
4982 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
4983 "upper_%s" : "lower_%s", adj_dev
->name
);
4984 return sysfs_create_link(&(dev
->dev
.kobj
), &(adj_dev
->dev
.kobj
),
4987 static void netdev_adjacent_sysfs_del(struct net_device
*dev
,
4989 struct list_head
*dev_list
)
4991 char linkname
[IFNAMSIZ
+7];
4992 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
4993 "upper_%s" : "lower_%s", name
);
4994 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4997 static inline bool netdev_adjacent_is_neigh_list(struct net_device
*dev
,
4998 struct net_device
*adj_dev
,
4999 struct list_head
*dev_list
)
5001 return (dev_list
== &dev
->adj_list
.upper
||
5002 dev_list
== &dev
->adj_list
.lower
) &&
5003 net_eq(dev_net(dev
), dev_net(adj_dev
));
5006 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
5007 struct net_device
*adj_dev
,
5008 struct list_head
*dev_list
,
5009 void *private, bool master
)
5011 struct netdev_adjacent
*adj
;
5014 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
5021 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
5026 adj
->master
= master
;
5028 adj
->private = private;
5031 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5032 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5034 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
)) {
5035 ret
= netdev_adjacent_sysfs_add(dev
, adj_dev
, dev_list
);
5040 /* Ensure that master link is always the first item in list. */
5042 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
5043 &(adj_dev
->dev
.kobj
), "master");
5045 goto remove_symlinks
;
5047 list_add_rcu(&adj
->list
, dev_list
);
5049 list_add_tail_rcu(&adj
->list
, dev_list
);
5055 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5056 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5064 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
5065 struct net_device
*adj_dev
,
5066 struct list_head
*dev_list
)
5068 struct netdev_adjacent
*adj
;
5070 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
5073 pr_err("tried to remove device %s from %s\n",
5074 dev
->name
, adj_dev
->name
);
5078 if (adj
->ref_nr
> 1) {
5079 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
5086 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
5088 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5089 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5091 list_del_rcu(&adj
->list
);
5092 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5093 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5095 kfree_rcu(adj
, rcu
);
5098 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
5099 struct net_device
*upper_dev
,
5100 struct list_head
*up_list
,
5101 struct list_head
*down_list
,
5102 void *private, bool master
)
5106 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
5111 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
5114 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5121 static int __netdev_adjacent_dev_link(struct net_device
*dev
,
5122 struct net_device
*upper_dev
)
5124 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5125 &dev
->all_adj_list
.upper
,
5126 &upper_dev
->all_adj_list
.lower
,
5130 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
5131 struct net_device
*upper_dev
,
5132 struct list_head
*up_list
,
5133 struct list_head
*down_list
)
5135 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5136 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
5139 static void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
5140 struct net_device
*upper_dev
)
5142 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5143 &dev
->all_adj_list
.upper
,
5144 &upper_dev
->all_adj_list
.lower
);
5147 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
5148 struct net_device
*upper_dev
,
5149 void *private, bool master
)
5151 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
5156 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5157 &dev
->adj_list
.upper
,
5158 &upper_dev
->adj_list
.lower
,
5161 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5168 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
5169 struct net_device
*upper_dev
)
5171 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5172 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5173 &dev
->adj_list
.upper
,
5174 &upper_dev
->adj_list
.lower
);
5177 static int __netdev_upper_dev_link(struct net_device
*dev
,
5178 struct net_device
*upper_dev
, bool master
,
5181 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
5186 if (dev
== upper_dev
)
5189 /* To prevent loops, check if dev is not upper device to upper_dev. */
5190 if (__netdev_find_adj(upper_dev
, dev
, &upper_dev
->all_adj_list
.upper
))
5193 if (__netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
))
5196 if (master
&& netdev_master_upper_dev_get(dev
))
5199 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, private,
5204 /* Now that we linked these devs, make all the upper_dev's
5205 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5206 * versa, and don't forget the devices itself. All of these
5207 * links are non-neighbours.
5209 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5210 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5211 pr_debug("Interlinking %s with %s, non-neighbour\n",
5212 i
->dev
->name
, j
->dev
->name
);
5213 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
5219 /* add dev to every upper_dev's upper device */
5220 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5221 pr_debug("linking %s's upper device %s with %s\n",
5222 upper_dev
->name
, i
->dev
->name
, dev
->name
);
5223 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
5225 goto rollback_upper_mesh
;
5228 /* add upper_dev to every dev's lower device */
5229 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5230 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
5231 i
->dev
->name
, upper_dev
->name
);
5232 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
5234 goto rollback_lower_mesh
;
5237 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
5240 rollback_lower_mesh
:
5242 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5245 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5250 rollback_upper_mesh
:
5252 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5255 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5263 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5264 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5265 if (i
== to_i
&& j
== to_j
)
5267 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5273 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5279 * netdev_upper_dev_link - Add a link to the upper device
5281 * @upper_dev: new upper device
5283 * Adds a link to device which is upper to this one. The caller must hold
5284 * the RTNL lock. On a failure a negative errno code is returned.
5285 * On success the reference counts are adjusted and the function
5288 int netdev_upper_dev_link(struct net_device
*dev
,
5289 struct net_device
*upper_dev
)
5291 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
);
5293 EXPORT_SYMBOL(netdev_upper_dev_link
);
5296 * netdev_master_upper_dev_link - Add a master link to the upper device
5298 * @upper_dev: new upper device
5300 * Adds a link to device which is upper to this one. In this case, only
5301 * one master upper device can be linked, although other non-master devices
5302 * might be linked as well. The caller must hold the RTNL lock.
5303 * On a failure a negative errno code is returned. On success the reference
5304 * counts are adjusted and the function returns zero.
5306 int netdev_master_upper_dev_link(struct net_device
*dev
,
5307 struct net_device
*upper_dev
)
5309 return __netdev_upper_dev_link(dev
, upper_dev
, true, NULL
);
5311 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
5313 int netdev_master_upper_dev_link_private(struct net_device
*dev
,
5314 struct net_device
*upper_dev
,
5317 return __netdev_upper_dev_link(dev
, upper_dev
, true, private);
5319 EXPORT_SYMBOL(netdev_master_upper_dev_link_private
);
5322 * netdev_upper_dev_unlink - Removes a link to upper device
5324 * @upper_dev: new upper device
5326 * Removes a link to device which is upper to this one. The caller must hold
5329 void netdev_upper_dev_unlink(struct net_device
*dev
,
5330 struct net_device
*upper_dev
)
5332 struct netdev_adjacent
*i
, *j
;
5335 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5337 /* Here is the tricky part. We must remove all dev's lower
5338 * devices from all upper_dev's upper devices and vice
5339 * versa, to maintain the graph relationship.
5341 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5342 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
5343 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5345 /* remove also the devices itself from lower/upper device
5348 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5349 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5351 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
5352 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5354 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
5356 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
5359 * netdev_bonding_info_change - Dispatch event about slave change
5361 * @bonding_info: info to dispatch
5363 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5364 * The caller must hold the RTNL lock.
5366 void netdev_bonding_info_change(struct net_device
*dev
,
5367 struct netdev_bonding_info
*bonding_info
)
5369 struct netdev_notifier_bonding_info info
;
5371 memcpy(&info
.bonding_info
, bonding_info
,
5372 sizeof(struct netdev_bonding_info
));
5373 call_netdevice_notifiers_info(NETDEV_BONDING_INFO
, dev
,
5376 EXPORT_SYMBOL(netdev_bonding_info_change
);
5378 static void netdev_adjacent_add_links(struct net_device
*dev
)
5380 struct netdev_adjacent
*iter
;
5382 struct net
*net
= dev_net(dev
);
5384 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5385 if (!net_eq(net
,dev_net(iter
->dev
)))
5387 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5388 &iter
->dev
->adj_list
.lower
);
5389 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5390 &dev
->adj_list
.upper
);
5393 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5394 if (!net_eq(net
,dev_net(iter
->dev
)))
5396 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5397 &iter
->dev
->adj_list
.upper
);
5398 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5399 &dev
->adj_list
.lower
);
5403 static void netdev_adjacent_del_links(struct net_device
*dev
)
5405 struct netdev_adjacent
*iter
;
5407 struct net
*net
= dev_net(dev
);
5409 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5410 if (!net_eq(net
,dev_net(iter
->dev
)))
5412 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5413 &iter
->dev
->adj_list
.lower
);
5414 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5415 &dev
->adj_list
.upper
);
5418 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5419 if (!net_eq(net
,dev_net(iter
->dev
)))
5421 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5422 &iter
->dev
->adj_list
.upper
);
5423 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5424 &dev
->adj_list
.lower
);
5428 void netdev_adjacent_rename_links(struct net_device
*dev
, char *oldname
)
5430 struct netdev_adjacent
*iter
;
5432 struct net
*net
= dev_net(dev
);
5434 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5435 if (!net_eq(net
,dev_net(iter
->dev
)))
5437 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5438 &iter
->dev
->adj_list
.lower
);
5439 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5440 &iter
->dev
->adj_list
.lower
);
5443 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5444 if (!net_eq(net
,dev_net(iter
->dev
)))
5446 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5447 &iter
->dev
->adj_list
.upper
);
5448 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5449 &iter
->dev
->adj_list
.upper
);
5453 void *netdev_lower_dev_get_private(struct net_device
*dev
,
5454 struct net_device
*lower_dev
)
5456 struct netdev_adjacent
*lower
;
5460 lower
= __netdev_find_adj(dev
, lower_dev
, &dev
->adj_list
.lower
);
5464 return lower
->private;
5466 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
5469 int dev_get_nest_level(struct net_device
*dev
,
5470 bool (*type_check
)(struct net_device
*dev
))
5472 struct net_device
*lower
= NULL
;
5473 struct list_head
*iter
;
5479 netdev_for_each_lower_dev(dev
, lower
, iter
) {
5480 nest
= dev_get_nest_level(lower
, type_check
);
5481 if (max_nest
< nest
)
5485 if (type_check(dev
))
5490 EXPORT_SYMBOL(dev_get_nest_level
);
5492 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
5494 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5496 if (ops
->ndo_change_rx_flags
)
5497 ops
->ndo_change_rx_flags(dev
, flags
);
5500 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
5502 unsigned int old_flags
= dev
->flags
;
5508 dev
->flags
|= IFF_PROMISC
;
5509 dev
->promiscuity
+= inc
;
5510 if (dev
->promiscuity
== 0) {
5513 * If inc causes overflow, untouch promisc and return error.
5516 dev
->flags
&= ~IFF_PROMISC
;
5518 dev
->promiscuity
-= inc
;
5519 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5524 if (dev
->flags
!= old_flags
) {
5525 pr_info("device %s %s promiscuous mode\n",
5527 dev
->flags
& IFF_PROMISC
? "entered" : "left");
5528 if (audit_enabled
) {
5529 current_uid_gid(&uid
, &gid
);
5530 audit_log(current
->audit_context
, GFP_ATOMIC
,
5531 AUDIT_ANOM_PROMISCUOUS
,
5532 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5533 dev
->name
, (dev
->flags
& IFF_PROMISC
),
5534 (old_flags
& IFF_PROMISC
),
5535 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
5536 from_kuid(&init_user_ns
, uid
),
5537 from_kgid(&init_user_ns
, gid
),
5538 audit_get_sessionid(current
));
5541 dev_change_rx_flags(dev
, IFF_PROMISC
);
5544 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
5549 * dev_set_promiscuity - update promiscuity count on a device
5553 * Add or remove promiscuity from a device. While the count in the device
5554 * remains above zero the interface remains promiscuous. Once it hits zero
5555 * the device reverts back to normal filtering operation. A negative inc
5556 * value is used to drop promiscuity on the device.
5557 * Return 0 if successful or a negative errno code on error.
5559 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
5561 unsigned int old_flags
= dev
->flags
;
5564 err
= __dev_set_promiscuity(dev
, inc
, true);
5567 if (dev
->flags
!= old_flags
)
5568 dev_set_rx_mode(dev
);
5571 EXPORT_SYMBOL(dev_set_promiscuity
);
5573 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
5575 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5579 dev
->flags
|= IFF_ALLMULTI
;
5580 dev
->allmulti
+= inc
;
5581 if (dev
->allmulti
== 0) {
5584 * If inc causes overflow, untouch allmulti and return error.
5587 dev
->flags
&= ~IFF_ALLMULTI
;
5589 dev
->allmulti
-= inc
;
5590 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5595 if (dev
->flags
^ old_flags
) {
5596 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
5597 dev_set_rx_mode(dev
);
5599 __dev_notify_flags(dev
, old_flags
,
5600 dev
->gflags
^ old_gflags
);
5606 * dev_set_allmulti - update allmulti count on a device
5610 * Add or remove reception of all multicast frames to a device. While the
5611 * count in the device remains above zero the interface remains listening
5612 * to all interfaces. Once it hits zero the device reverts back to normal
5613 * filtering operation. A negative @inc value is used to drop the counter
5614 * when releasing a resource needing all multicasts.
5615 * Return 0 if successful or a negative errno code on error.
5618 int dev_set_allmulti(struct net_device
*dev
, int inc
)
5620 return __dev_set_allmulti(dev
, inc
, true);
5622 EXPORT_SYMBOL(dev_set_allmulti
);
5625 * Upload unicast and multicast address lists to device and
5626 * configure RX filtering. When the device doesn't support unicast
5627 * filtering it is put in promiscuous mode while unicast addresses
5630 void __dev_set_rx_mode(struct net_device
*dev
)
5632 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5634 /* dev_open will call this function so the list will stay sane. */
5635 if (!(dev
->flags
&IFF_UP
))
5638 if (!netif_device_present(dev
))
5641 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
5642 /* Unicast addresses changes may only happen under the rtnl,
5643 * therefore calling __dev_set_promiscuity here is safe.
5645 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
5646 __dev_set_promiscuity(dev
, 1, false);
5647 dev
->uc_promisc
= true;
5648 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
5649 __dev_set_promiscuity(dev
, -1, false);
5650 dev
->uc_promisc
= false;
5654 if (ops
->ndo_set_rx_mode
)
5655 ops
->ndo_set_rx_mode(dev
);
5658 void dev_set_rx_mode(struct net_device
*dev
)
5660 netif_addr_lock_bh(dev
);
5661 __dev_set_rx_mode(dev
);
5662 netif_addr_unlock_bh(dev
);
5666 * dev_get_flags - get flags reported to userspace
5669 * Get the combination of flag bits exported through APIs to userspace.
5671 unsigned int dev_get_flags(const struct net_device
*dev
)
5675 flags
= (dev
->flags
& ~(IFF_PROMISC
|
5680 (dev
->gflags
& (IFF_PROMISC
|
5683 if (netif_running(dev
)) {
5684 if (netif_oper_up(dev
))
5685 flags
|= IFF_RUNNING
;
5686 if (netif_carrier_ok(dev
))
5687 flags
|= IFF_LOWER_UP
;
5688 if (netif_dormant(dev
))
5689 flags
|= IFF_DORMANT
;
5694 EXPORT_SYMBOL(dev_get_flags
);
5696 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5698 unsigned int old_flags
= dev
->flags
;
5704 * Set the flags on our device.
5707 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
5708 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
5710 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
5714 * Load in the correct multicast list now the flags have changed.
5717 if ((old_flags
^ flags
) & IFF_MULTICAST
)
5718 dev_change_rx_flags(dev
, IFF_MULTICAST
);
5720 dev_set_rx_mode(dev
);
5723 * Have we downed the interface. We handle IFF_UP ourselves
5724 * according to user attempts to set it, rather than blindly
5729 if ((old_flags
^ flags
) & IFF_UP
)
5730 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
5732 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
5733 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
5734 unsigned int old_flags
= dev
->flags
;
5736 dev
->gflags
^= IFF_PROMISC
;
5738 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
5739 if (dev
->flags
!= old_flags
)
5740 dev_set_rx_mode(dev
);
5743 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5744 is important. Some (broken) drivers set IFF_PROMISC, when
5745 IFF_ALLMULTI is requested not asking us and not reporting.
5747 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
5748 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
5750 dev
->gflags
^= IFF_ALLMULTI
;
5751 __dev_set_allmulti(dev
, inc
, false);
5757 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
5758 unsigned int gchanges
)
5760 unsigned int changes
= dev
->flags
^ old_flags
;
5763 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
5765 if (changes
& IFF_UP
) {
5766 if (dev
->flags
& IFF_UP
)
5767 call_netdevice_notifiers(NETDEV_UP
, dev
);
5769 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
5772 if (dev
->flags
& IFF_UP
&&
5773 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
5774 struct netdev_notifier_change_info change_info
;
5776 change_info
.flags_changed
= changes
;
5777 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
5783 * dev_change_flags - change device settings
5785 * @flags: device state flags
5787 * Change settings on device based state flags. The flags are
5788 * in the userspace exported format.
5790 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5793 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5795 ret
= __dev_change_flags(dev
, flags
);
5799 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
5800 __dev_notify_flags(dev
, old_flags
, changes
);
5803 EXPORT_SYMBOL(dev_change_flags
);
5805 static int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5807 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5809 if (ops
->ndo_change_mtu
)
5810 return ops
->ndo_change_mtu(dev
, new_mtu
);
5817 * dev_set_mtu - Change maximum transfer unit
5819 * @new_mtu: new transfer unit
5821 * Change the maximum transfer size of the network device.
5823 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5827 if (new_mtu
== dev
->mtu
)
5830 /* MTU must be positive. */
5834 if (!netif_device_present(dev
))
5837 err
= call_netdevice_notifiers(NETDEV_PRECHANGEMTU
, dev
);
5838 err
= notifier_to_errno(err
);
5842 orig_mtu
= dev
->mtu
;
5843 err
= __dev_set_mtu(dev
, new_mtu
);
5846 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5847 err
= notifier_to_errno(err
);
5849 /* setting mtu back and notifying everyone again,
5850 * so that they have a chance to revert changes.
5852 __dev_set_mtu(dev
, orig_mtu
);
5853 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5858 EXPORT_SYMBOL(dev_set_mtu
);
5861 * dev_set_group - Change group this device belongs to
5863 * @new_group: group this device should belong to
5865 void dev_set_group(struct net_device
*dev
, int new_group
)
5867 dev
->group
= new_group
;
5869 EXPORT_SYMBOL(dev_set_group
);
5872 * dev_set_mac_address - Change Media Access Control Address
5876 * Change the hardware (MAC) address of the device
5878 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
5880 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5883 if (!ops
->ndo_set_mac_address
)
5885 if (sa
->sa_family
!= dev
->type
)
5887 if (!netif_device_present(dev
))
5889 err
= ops
->ndo_set_mac_address(dev
, sa
);
5892 dev
->addr_assign_type
= NET_ADDR_SET
;
5893 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
5894 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5897 EXPORT_SYMBOL(dev_set_mac_address
);
5900 * dev_change_carrier - Change device carrier
5902 * @new_carrier: new value
5904 * Change device carrier
5906 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
5908 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5910 if (!ops
->ndo_change_carrier
)
5912 if (!netif_device_present(dev
))
5914 return ops
->ndo_change_carrier(dev
, new_carrier
);
5916 EXPORT_SYMBOL(dev_change_carrier
);
5919 * dev_get_phys_port_id - Get device physical port ID
5923 * Get device physical port ID
5925 int dev_get_phys_port_id(struct net_device
*dev
,
5926 struct netdev_phys_item_id
*ppid
)
5928 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5930 if (!ops
->ndo_get_phys_port_id
)
5932 return ops
->ndo_get_phys_port_id(dev
, ppid
);
5934 EXPORT_SYMBOL(dev_get_phys_port_id
);
5937 * dev_get_phys_port_name - Get device physical port name
5941 * Get device physical port name
5943 int dev_get_phys_port_name(struct net_device
*dev
,
5944 char *name
, size_t len
)
5946 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5948 if (!ops
->ndo_get_phys_port_name
)
5950 return ops
->ndo_get_phys_port_name(dev
, name
, len
);
5952 EXPORT_SYMBOL(dev_get_phys_port_name
);
5955 * dev_new_index - allocate an ifindex
5956 * @net: the applicable net namespace
5958 * Returns a suitable unique value for a new device interface
5959 * number. The caller must hold the rtnl semaphore or the
5960 * dev_base_lock to be sure it remains unique.
5962 static int dev_new_index(struct net
*net
)
5964 int ifindex
= net
->ifindex
;
5968 if (!__dev_get_by_index(net
, ifindex
))
5969 return net
->ifindex
= ifindex
;
5973 /* Delayed registration/unregisteration */
5974 static LIST_HEAD(net_todo_list
);
5975 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
5977 static void net_set_todo(struct net_device
*dev
)
5979 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5980 dev_net(dev
)->dev_unreg_count
++;
5983 static void rollback_registered_many(struct list_head
*head
)
5985 struct net_device
*dev
, *tmp
;
5986 LIST_HEAD(close_head
);
5988 BUG_ON(dev_boot_phase
);
5991 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5992 /* Some devices call without registering
5993 * for initialization unwind. Remove those
5994 * devices and proceed with the remaining.
5996 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5997 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6001 list_del(&dev
->unreg_list
);
6004 dev
->dismantle
= true;
6005 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
6008 /* If device is running, close it first. */
6009 list_for_each_entry(dev
, head
, unreg_list
)
6010 list_add_tail(&dev
->close_list
, &close_head
);
6011 dev_close_many(&close_head
, true);
6013 list_for_each_entry(dev
, head
, unreg_list
) {
6014 /* And unlink it from device chain. */
6015 unlist_netdevice(dev
);
6017 dev
->reg_state
= NETREG_UNREGISTERING
;
6022 list_for_each_entry(dev
, head
, unreg_list
) {
6023 struct sk_buff
*skb
= NULL
;
6025 /* Shutdown queueing discipline. */
6029 /* Notify protocols, that we are about to destroy
6030 this device. They should clean all the things.
6032 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6034 if (!dev
->rtnl_link_ops
||
6035 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6036 skb
= rtmsg_ifinfo_build_skb(RTM_DELLINK
, dev
, ~0U,
6040 * Flush the unicast and multicast chains
6045 if (dev
->netdev_ops
->ndo_uninit
)
6046 dev
->netdev_ops
->ndo_uninit(dev
);
6049 rtmsg_ifinfo_send(skb
, dev
, GFP_KERNEL
);
6051 /* Notifier chain MUST detach us all upper devices. */
6052 WARN_ON(netdev_has_any_upper_dev(dev
));
6054 /* Remove entries from kobject tree */
6055 netdev_unregister_kobject(dev
);
6057 /* Remove XPS queueing entries */
6058 netif_reset_xps_queues_gt(dev
, 0);
6064 list_for_each_entry(dev
, head
, unreg_list
)
6068 static void rollback_registered(struct net_device
*dev
)
6072 list_add(&dev
->unreg_list
, &single
);
6073 rollback_registered_many(&single
);
6077 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
6078 netdev_features_t features
)
6080 /* Fix illegal checksum combinations */
6081 if ((features
& NETIF_F_HW_CSUM
) &&
6082 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6083 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
6084 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
6087 /* TSO requires that SG is present as well. */
6088 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
6089 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
6090 features
&= ~NETIF_F_ALL_TSO
;
6093 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
6094 !(features
& NETIF_F_IP_CSUM
)) {
6095 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
6096 features
&= ~NETIF_F_TSO
;
6097 features
&= ~NETIF_F_TSO_ECN
;
6100 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
6101 !(features
& NETIF_F_IPV6_CSUM
)) {
6102 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
6103 features
&= ~NETIF_F_TSO6
;
6106 /* TSO ECN requires that TSO is present as well. */
6107 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
6108 features
&= ~NETIF_F_TSO_ECN
;
6110 /* Software GSO depends on SG. */
6111 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
6112 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
6113 features
&= ~NETIF_F_GSO
;
6116 /* UFO needs SG and checksumming */
6117 if (features
& NETIF_F_UFO
) {
6118 /* maybe split UFO into V4 and V6? */
6119 if (!((features
& NETIF_F_GEN_CSUM
) ||
6120 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
6121 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6123 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6124 features
&= ~NETIF_F_UFO
;
6127 if (!(features
& NETIF_F_SG
)) {
6129 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6130 features
&= ~NETIF_F_UFO
;
6134 #ifdef CONFIG_NET_RX_BUSY_POLL
6135 if (dev
->netdev_ops
->ndo_busy_poll
)
6136 features
|= NETIF_F_BUSY_POLL
;
6139 features
&= ~NETIF_F_BUSY_POLL
;
6144 int __netdev_update_features(struct net_device
*dev
)
6146 netdev_features_t features
;
6151 features
= netdev_get_wanted_features(dev
);
6153 if (dev
->netdev_ops
->ndo_fix_features
)
6154 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
6156 /* driver might be less strict about feature dependencies */
6157 features
= netdev_fix_features(dev
, features
);
6159 if (dev
->features
== features
)
6162 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
6163 &dev
->features
, &features
);
6165 if (dev
->netdev_ops
->ndo_set_features
)
6166 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
6168 if (unlikely(err
< 0)) {
6170 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6171 err
, &features
, &dev
->features
);
6176 dev
->features
= features
;
6182 * netdev_update_features - recalculate device features
6183 * @dev: the device to check
6185 * Recalculate dev->features set and send notifications if it
6186 * has changed. Should be called after driver or hardware dependent
6187 * conditions might have changed that influence the features.
6189 void netdev_update_features(struct net_device
*dev
)
6191 if (__netdev_update_features(dev
))
6192 netdev_features_change(dev
);
6194 EXPORT_SYMBOL(netdev_update_features
);
6197 * netdev_change_features - recalculate device features
6198 * @dev: the device to check
6200 * Recalculate dev->features set and send notifications even
6201 * if they have not changed. Should be called instead of
6202 * netdev_update_features() if also dev->vlan_features might
6203 * have changed to allow the changes to be propagated to stacked
6206 void netdev_change_features(struct net_device
*dev
)
6208 __netdev_update_features(dev
);
6209 netdev_features_change(dev
);
6211 EXPORT_SYMBOL(netdev_change_features
);
6214 * netif_stacked_transfer_operstate - transfer operstate
6215 * @rootdev: the root or lower level device to transfer state from
6216 * @dev: the device to transfer operstate to
6218 * Transfer operational state from root to device. This is normally
6219 * called when a stacking relationship exists between the root
6220 * device and the device(a leaf device).
6222 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
6223 struct net_device
*dev
)
6225 if (rootdev
->operstate
== IF_OPER_DORMANT
)
6226 netif_dormant_on(dev
);
6228 netif_dormant_off(dev
);
6230 if (netif_carrier_ok(rootdev
)) {
6231 if (!netif_carrier_ok(dev
))
6232 netif_carrier_on(dev
);
6234 if (netif_carrier_ok(dev
))
6235 netif_carrier_off(dev
);
6238 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
6241 static int netif_alloc_rx_queues(struct net_device
*dev
)
6243 unsigned int i
, count
= dev
->num_rx_queues
;
6244 struct netdev_rx_queue
*rx
;
6245 size_t sz
= count
* sizeof(*rx
);
6249 rx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6257 for (i
= 0; i
< count
; i
++)
6263 static void netdev_init_one_queue(struct net_device
*dev
,
6264 struct netdev_queue
*queue
, void *_unused
)
6266 /* Initialize queue lock */
6267 spin_lock_init(&queue
->_xmit_lock
);
6268 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
6269 queue
->xmit_lock_owner
= -1;
6270 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
6273 dql_init(&queue
->dql
, HZ
);
6277 static void netif_free_tx_queues(struct net_device
*dev
)
6282 static int netif_alloc_netdev_queues(struct net_device
*dev
)
6284 unsigned int count
= dev
->num_tx_queues
;
6285 struct netdev_queue
*tx
;
6286 size_t sz
= count
* sizeof(*tx
);
6288 BUG_ON(count
< 1 || count
> 0xffff);
6290 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6298 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
6299 spin_lock_init(&dev
->tx_global_lock
);
6305 * register_netdevice - register a network device
6306 * @dev: device to register
6308 * Take a completed network device structure and add it to the kernel
6309 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6310 * chain. 0 is returned on success. A negative errno code is returned
6311 * on a failure to set up the device, or if the name is a duplicate.
6313 * Callers must hold the rtnl semaphore. You may want
6314 * register_netdev() instead of this.
6317 * The locking appears insufficient to guarantee two parallel registers
6318 * will not get the same name.
6321 int register_netdevice(struct net_device
*dev
)
6324 struct net
*net
= dev_net(dev
);
6326 BUG_ON(dev_boot_phase
);
6331 /* When net_device's are persistent, this will be fatal. */
6332 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
6335 spin_lock_init(&dev
->addr_list_lock
);
6336 netdev_set_addr_lockdep_class(dev
);
6338 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
6342 /* Init, if this function is available */
6343 if (dev
->netdev_ops
->ndo_init
) {
6344 ret
= dev
->netdev_ops
->ndo_init(dev
);
6352 if (((dev
->hw_features
| dev
->features
) &
6353 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
6354 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
6355 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
6356 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
6363 dev
->ifindex
= dev_new_index(net
);
6364 else if (__dev_get_by_index(net
, dev
->ifindex
))
6367 /* Transfer changeable features to wanted_features and enable
6368 * software offloads (GSO and GRO).
6370 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
6371 dev
->features
|= NETIF_F_SOFT_FEATURES
;
6372 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
6374 if (!(dev
->flags
& IFF_LOOPBACK
)) {
6375 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
6378 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6380 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
6382 /* Make NETIF_F_SG inheritable to tunnel devices.
6384 dev
->hw_enc_features
|= NETIF_F_SG
;
6386 /* Make NETIF_F_SG inheritable to MPLS.
6388 dev
->mpls_features
|= NETIF_F_SG
;
6390 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
6391 ret
= notifier_to_errno(ret
);
6395 ret
= netdev_register_kobject(dev
);
6398 dev
->reg_state
= NETREG_REGISTERED
;
6400 __netdev_update_features(dev
);
6403 * Default initial state at registry is that the
6404 * device is present.
6407 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6409 linkwatch_init_dev(dev
);
6411 dev_init_scheduler(dev
);
6413 list_netdevice(dev
);
6414 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6416 /* If the device has permanent device address, driver should
6417 * set dev_addr and also addr_assign_type should be set to
6418 * NET_ADDR_PERM (default value).
6420 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
6421 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
6423 /* Notify protocols, that a new device appeared. */
6424 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6425 ret
= notifier_to_errno(ret
);
6427 rollback_registered(dev
);
6428 dev
->reg_state
= NETREG_UNREGISTERED
;
6431 * Prevent userspace races by waiting until the network
6432 * device is fully setup before sending notifications.
6434 if (!dev
->rtnl_link_ops
||
6435 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6436 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6442 if (dev
->netdev_ops
->ndo_uninit
)
6443 dev
->netdev_ops
->ndo_uninit(dev
);
6446 EXPORT_SYMBOL(register_netdevice
);
6449 * init_dummy_netdev - init a dummy network device for NAPI
6450 * @dev: device to init
6452 * This takes a network device structure and initialize the minimum
6453 * amount of fields so it can be used to schedule NAPI polls without
6454 * registering a full blown interface. This is to be used by drivers
6455 * that need to tie several hardware interfaces to a single NAPI
6456 * poll scheduler due to HW limitations.
6458 int init_dummy_netdev(struct net_device
*dev
)
6460 /* Clear everything. Note we don't initialize spinlocks
6461 * are they aren't supposed to be taken by any of the
6462 * NAPI code and this dummy netdev is supposed to be
6463 * only ever used for NAPI polls
6465 memset(dev
, 0, sizeof(struct net_device
));
6467 /* make sure we BUG if trying to hit standard
6468 * register/unregister code path
6470 dev
->reg_state
= NETREG_DUMMY
;
6472 /* NAPI wants this */
6473 INIT_LIST_HEAD(&dev
->napi_list
);
6475 /* a dummy interface is started by default */
6476 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6477 set_bit(__LINK_STATE_START
, &dev
->state
);
6479 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6480 * because users of this 'device' dont need to change
6486 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
6490 * register_netdev - register a network device
6491 * @dev: device to register
6493 * Take a completed network device structure and add it to the kernel
6494 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6495 * chain. 0 is returned on success. A negative errno code is returned
6496 * on a failure to set up the device, or if the name is a duplicate.
6498 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6499 * and expands the device name if you passed a format string to
6502 int register_netdev(struct net_device
*dev
)
6507 err
= register_netdevice(dev
);
6511 EXPORT_SYMBOL(register_netdev
);
6513 int netdev_refcnt_read(const struct net_device
*dev
)
6517 for_each_possible_cpu(i
)
6518 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
6521 EXPORT_SYMBOL(netdev_refcnt_read
);
6524 * netdev_wait_allrefs - wait until all references are gone.
6525 * @dev: target net_device
6527 * This is called when unregistering network devices.
6529 * Any protocol or device that holds a reference should register
6530 * for netdevice notification, and cleanup and put back the
6531 * reference if they receive an UNREGISTER event.
6532 * We can get stuck here if buggy protocols don't correctly
6535 static void netdev_wait_allrefs(struct net_device
*dev
)
6537 unsigned long rebroadcast_time
, warning_time
;
6540 linkwatch_forget_dev(dev
);
6542 rebroadcast_time
= warning_time
= jiffies
;
6543 refcnt
= netdev_refcnt_read(dev
);
6545 while (refcnt
!= 0) {
6546 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
6549 /* Rebroadcast unregister notification */
6550 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6556 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6557 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
6559 /* We must not have linkwatch events
6560 * pending on unregister. If this
6561 * happens, we simply run the queue
6562 * unscheduled, resulting in a noop
6565 linkwatch_run_queue();
6570 rebroadcast_time
= jiffies
;
6575 refcnt
= netdev_refcnt_read(dev
);
6577 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
6578 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6580 warning_time
= jiffies
;
6589 * register_netdevice(x1);
6590 * register_netdevice(x2);
6592 * unregister_netdevice(y1);
6593 * unregister_netdevice(y2);
6599 * We are invoked by rtnl_unlock().
6600 * This allows us to deal with problems:
6601 * 1) We can delete sysfs objects which invoke hotplug
6602 * without deadlocking with linkwatch via keventd.
6603 * 2) Since we run with the RTNL semaphore not held, we can sleep
6604 * safely in order to wait for the netdev refcnt to drop to zero.
6606 * We must not return until all unregister events added during
6607 * the interval the lock was held have been completed.
6609 void netdev_run_todo(void)
6611 struct list_head list
;
6613 /* Snapshot list, allow later requests */
6614 list_replace_init(&net_todo_list
, &list
);
6619 /* Wait for rcu callbacks to finish before next phase */
6620 if (!list_empty(&list
))
6623 while (!list_empty(&list
)) {
6624 struct net_device
*dev
6625 = list_first_entry(&list
, struct net_device
, todo_list
);
6626 list_del(&dev
->todo_list
);
6629 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6632 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
6633 pr_err("network todo '%s' but state %d\n",
6634 dev
->name
, dev
->reg_state
);
6639 dev
->reg_state
= NETREG_UNREGISTERED
;
6641 on_each_cpu(flush_backlog
, dev
, 1);
6643 netdev_wait_allrefs(dev
);
6646 BUG_ON(netdev_refcnt_read(dev
));
6647 BUG_ON(!list_empty(&dev
->ptype_all
));
6648 BUG_ON(!list_empty(&dev
->ptype_specific
));
6649 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
6650 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
6651 WARN_ON(dev
->dn_ptr
);
6653 if (dev
->destructor
)
6654 dev
->destructor(dev
);
6656 /* Report a network device has been unregistered */
6658 dev_net(dev
)->dev_unreg_count
--;
6660 wake_up(&netdev_unregistering_wq
);
6662 /* Free network device */
6663 kobject_put(&dev
->dev
.kobj
);
6667 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6668 * fields in the same order, with only the type differing.
6670 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
6671 const struct net_device_stats
*netdev_stats
)
6673 #if BITS_PER_LONG == 64
6674 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
6675 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
6677 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
6678 const unsigned long *src
= (const unsigned long *)netdev_stats
;
6679 u64
*dst
= (u64
*)stats64
;
6681 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
6682 sizeof(*stats64
) / sizeof(u64
));
6683 for (i
= 0; i
< n
; i
++)
6687 EXPORT_SYMBOL(netdev_stats_to_stats64
);
6690 * dev_get_stats - get network device statistics
6691 * @dev: device to get statistics from
6692 * @storage: place to store stats
6694 * Get network statistics from device. Return @storage.
6695 * The device driver may provide its own method by setting
6696 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6697 * otherwise the internal statistics structure is used.
6699 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
6700 struct rtnl_link_stats64
*storage
)
6702 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6704 if (ops
->ndo_get_stats64
) {
6705 memset(storage
, 0, sizeof(*storage
));
6706 ops
->ndo_get_stats64(dev
, storage
);
6707 } else if (ops
->ndo_get_stats
) {
6708 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
6710 netdev_stats_to_stats64(storage
, &dev
->stats
);
6712 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
6713 storage
->tx_dropped
+= atomic_long_read(&dev
->tx_dropped
);
6716 EXPORT_SYMBOL(dev_get_stats
);
6718 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
6720 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
6722 #ifdef CONFIG_NET_CLS_ACT
6725 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
6728 netdev_init_one_queue(dev
, queue
, NULL
);
6729 RCU_INIT_POINTER(queue
->qdisc
, &noop_qdisc
);
6730 queue
->qdisc_sleeping
= &noop_qdisc
;
6731 rcu_assign_pointer(dev
->ingress_queue
, queue
);
6736 static const struct ethtool_ops default_ethtool_ops
;
6738 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
6739 const struct ethtool_ops
*ops
)
6741 if (dev
->ethtool_ops
== &default_ethtool_ops
)
6742 dev
->ethtool_ops
= ops
;
6744 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
6746 void netdev_freemem(struct net_device
*dev
)
6748 char *addr
= (char *)dev
- dev
->padded
;
6754 * alloc_netdev_mqs - allocate network device
6755 * @sizeof_priv: size of private data to allocate space for
6756 * @name: device name format string
6757 * @name_assign_type: origin of device name
6758 * @setup: callback to initialize device
6759 * @txqs: the number of TX subqueues to allocate
6760 * @rxqs: the number of RX subqueues to allocate
6762 * Allocates a struct net_device with private data area for driver use
6763 * and performs basic initialization. Also allocates subqueue structs
6764 * for each queue on the device.
6766 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
6767 unsigned char name_assign_type
,
6768 void (*setup
)(struct net_device
*),
6769 unsigned int txqs
, unsigned int rxqs
)
6771 struct net_device
*dev
;
6773 struct net_device
*p
;
6775 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
6778 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6784 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6789 alloc_size
= sizeof(struct net_device
);
6791 /* ensure 32-byte alignment of private area */
6792 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
6793 alloc_size
+= sizeof_priv
;
6795 /* ensure 32-byte alignment of whole construct */
6796 alloc_size
+= NETDEV_ALIGN
- 1;
6798 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6800 p
= vzalloc(alloc_size
);
6804 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
6805 dev
->padded
= (char *)dev
- (char *)p
;
6807 dev
->pcpu_refcnt
= alloc_percpu(int);
6808 if (!dev
->pcpu_refcnt
)
6811 if (dev_addr_init(dev
))
6817 dev_net_set(dev
, &init_net
);
6819 dev
->gso_max_size
= GSO_MAX_SIZE
;
6820 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6821 dev
->gso_min_segs
= 0;
6823 INIT_LIST_HEAD(&dev
->napi_list
);
6824 INIT_LIST_HEAD(&dev
->unreg_list
);
6825 INIT_LIST_HEAD(&dev
->close_list
);
6826 INIT_LIST_HEAD(&dev
->link_watch_list
);
6827 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
6828 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
6829 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
6830 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
6831 INIT_LIST_HEAD(&dev
->ptype_all
);
6832 INIT_LIST_HEAD(&dev
->ptype_specific
);
6833 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
| IFF_XMIT_DST_RELEASE_PERM
;
6836 dev
->num_tx_queues
= txqs
;
6837 dev
->real_num_tx_queues
= txqs
;
6838 if (netif_alloc_netdev_queues(dev
))
6842 dev
->num_rx_queues
= rxqs
;
6843 dev
->real_num_rx_queues
= rxqs
;
6844 if (netif_alloc_rx_queues(dev
))
6848 strcpy(dev
->name
, name
);
6849 dev
->name_assign_type
= name_assign_type
;
6850 dev
->group
= INIT_NETDEV_GROUP
;
6851 if (!dev
->ethtool_ops
)
6852 dev
->ethtool_ops
= &default_ethtool_ops
;
6860 free_percpu(dev
->pcpu_refcnt
);
6862 netdev_freemem(dev
);
6865 EXPORT_SYMBOL(alloc_netdev_mqs
);
6868 * free_netdev - free network device
6871 * This function does the last stage of destroying an allocated device
6872 * interface. The reference to the device object is released.
6873 * If this is the last reference then it will be freed.
6875 void free_netdev(struct net_device
*dev
)
6877 struct napi_struct
*p
, *n
;
6879 netif_free_tx_queues(dev
);
6884 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6886 /* Flush device addresses */
6887 dev_addr_flush(dev
);
6889 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6892 free_percpu(dev
->pcpu_refcnt
);
6893 dev
->pcpu_refcnt
= NULL
;
6895 /* Compatibility with error handling in drivers */
6896 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6897 netdev_freemem(dev
);
6901 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6902 dev
->reg_state
= NETREG_RELEASED
;
6904 /* will free via device release */
6905 put_device(&dev
->dev
);
6907 EXPORT_SYMBOL(free_netdev
);
6910 * synchronize_net - Synchronize with packet receive processing
6912 * Wait for packets currently being received to be done.
6913 * Does not block later packets from starting.
6915 void synchronize_net(void)
6918 if (rtnl_is_locked())
6919 synchronize_rcu_expedited();
6923 EXPORT_SYMBOL(synchronize_net
);
6926 * unregister_netdevice_queue - remove device from the kernel
6930 * This function shuts down a device interface and removes it
6931 * from the kernel tables.
6932 * If head not NULL, device is queued to be unregistered later.
6934 * Callers must hold the rtnl semaphore. You may want
6935 * unregister_netdev() instead of this.
6938 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6943 list_move_tail(&dev
->unreg_list
, head
);
6945 rollback_registered(dev
);
6946 /* Finish processing unregister after unlock */
6950 EXPORT_SYMBOL(unregister_netdevice_queue
);
6953 * unregister_netdevice_many - unregister many devices
6954 * @head: list of devices
6956 * Note: As most callers use a stack allocated list_head,
6957 * we force a list_del() to make sure stack wont be corrupted later.
6959 void unregister_netdevice_many(struct list_head
*head
)
6961 struct net_device
*dev
;
6963 if (!list_empty(head
)) {
6964 rollback_registered_many(head
);
6965 list_for_each_entry(dev
, head
, unreg_list
)
6970 EXPORT_SYMBOL(unregister_netdevice_many
);
6973 * unregister_netdev - remove device from the kernel
6976 * This function shuts down a device interface and removes it
6977 * from the kernel tables.
6979 * This is just a wrapper for unregister_netdevice that takes
6980 * the rtnl semaphore. In general you want to use this and not
6981 * unregister_netdevice.
6983 void unregister_netdev(struct net_device
*dev
)
6986 unregister_netdevice(dev
);
6989 EXPORT_SYMBOL(unregister_netdev
);
6992 * dev_change_net_namespace - move device to different nethost namespace
6994 * @net: network namespace
6995 * @pat: If not NULL name pattern to try if the current device name
6996 * is already taken in the destination network namespace.
6998 * This function shuts down a device interface and moves it
6999 * to a new network namespace. On success 0 is returned, on
7000 * a failure a netagive errno code is returned.
7002 * Callers must hold the rtnl semaphore.
7005 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
7011 /* Don't allow namespace local devices to be moved. */
7013 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7016 /* Ensure the device has been registrered */
7017 if (dev
->reg_state
!= NETREG_REGISTERED
)
7020 /* Get out if there is nothing todo */
7022 if (net_eq(dev_net(dev
), net
))
7025 /* Pick the destination device name, and ensure
7026 * we can use it in the destination network namespace.
7029 if (__dev_get_by_name(net
, dev
->name
)) {
7030 /* We get here if we can't use the current device name */
7033 if (dev_get_valid_name(net
, dev
, pat
) < 0)
7038 * And now a mini version of register_netdevice unregister_netdevice.
7041 /* If device is running close it first. */
7044 /* And unlink it from device chain */
7046 unlist_netdevice(dev
);
7050 /* Shutdown queueing discipline. */
7053 /* Notify protocols, that we are about to destroy
7054 this device. They should clean all the things.
7056 Note that dev->reg_state stays at NETREG_REGISTERED.
7057 This is wanted because this way 8021q and macvlan know
7058 the device is just moving and can keep their slaves up.
7060 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
7062 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7063 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
7066 * Flush the unicast and multicast chains
7071 /* Send a netdev-removed uevent to the old namespace */
7072 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
7073 netdev_adjacent_del_links(dev
);
7075 /* Actually switch the network namespace */
7076 dev_net_set(dev
, net
);
7078 /* If there is an ifindex conflict assign a new one */
7079 if (__dev_get_by_index(net
, dev
->ifindex
))
7080 dev
->ifindex
= dev_new_index(net
);
7082 /* Send a netdev-add uevent to the new namespace */
7083 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
7084 netdev_adjacent_add_links(dev
);
7086 /* Fixup kobjects */
7087 err
= device_rename(&dev
->dev
, dev
->name
);
7090 /* Add the device back in the hashes */
7091 list_netdevice(dev
);
7093 /* Notify protocols, that a new device appeared. */
7094 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
7097 * Prevent userspace races by waiting until the network
7098 * device is fully setup before sending notifications.
7100 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
7107 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
7109 static int dev_cpu_callback(struct notifier_block
*nfb
,
7110 unsigned long action
,
7113 struct sk_buff
**list_skb
;
7114 struct sk_buff
*skb
;
7115 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
7116 struct softnet_data
*sd
, *oldsd
;
7118 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
7121 local_irq_disable();
7122 cpu
= smp_processor_id();
7123 sd
= &per_cpu(softnet_data
, cpu
);
7124 oldsd
= &per_cpu(softnet_data
, oldcpu
);
7126 /* Find end of our completion_queue. */
7127 list_skb
= &sd
->completion_queue
;
7129 list_skb
= &(*list_skb
)->next
;
7130 /* Append completion queue from offline CPU. */
7131 *list_skb
= oldsd
->completion_queue
;
7132 oldsd
->completion_queue
= NULL
;
7134 /* Append output queue from offline CPU. */
7135 if (oldsd
->output_queue
) {
7136 *sd
->output_queue_tailp
= oldsd
->output_queue
;
7137 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
7138 oldsd
->output_queue
= NULL
;
7139 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
7141 /* Append NAPI poll list from offline CPU, with one exception :
7142 * process_backlog() must be called by cpu owning percpu backlog.
7143 * We properly handle process_queue & input_pkt_queue later.
7145 while (!list_empty(&oldsd
->poll_list
)) {
7146 struct napi_struct
*napi
= list_first_entry(&oldsd
->poll_list
,
7150 list_del_init(&napi
->poll_list
);
7151 if (napi
->poll
== process_backlog
)
7154 ____napi_schedule(sd
, napi
);
7157 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
7160 /* Process offline CPU's input_pkt_queue */
7161 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
7163 input_queue_head_incr(oldsd
);
7165 while ((skb
= skb_dequeue(&oldsd
->input_pkt_queue
))) {
7167 input_queue_head_incr(oldsd
);
7175 * netdev_increment_features - increment feature set by one
7176 * @all: current feature set
7177 * @one: new feature set
7178 * @mask: mask feature set
7180 * Computes a new feature set after adding a device with feature set
7181 * @one to the master device with current feature set @all. Will not
7182 * enable anything that is off in @mask. Returns the new feature set.
7184 netdev_features_t
netdev_increment_features(netdev_features_t all
,
7185 netdev_features_t one
, netdev_features_t mask
)
7187 if (mask
& NETIF_F_GEN_CSUM
)
7188 mask
|= NETIF_F_ALL_CSUM
;
7189 mask
|= NETIF_F_VLAN_CHALLENGED
;
7191 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
7192 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
7194 /* If one device supports hw checksumming, set for all. */
7195 if (all
& NETIF_F_GEN_CSUM
)
7196 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
7200 EXPORT_SYMBOL(netdev_increment_features
);
7202 static struct hlist_head
* __net_init
netdev_create_hash(void)
7205 struct hlist_head
*hash
;
7207 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
7209 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
7210 INIT_HLIST_HEAD(&hash
[i
]);
7215 /* Initialize per network namespace state */
7216 static int __net_init
netdev_init(struct net
*net
)
7218 if (net
!= &init_net
)
7219 INIT_LIST_HEAD(&net
->dev_base_head
);
7221 net
->dev_name_head
= netdev_create_hash();
7222 if (net
->dev_name_head
== NULL
)
7225 net
->dev_index_head
= netdev_create_hash();
7226 if (net
->dev_index_head
== NULL
)
7232 kfree(net
->dev_name_head
);
7238 * netdev_drivername - network driver for the device
7239 * @dev: network device
7241 * Determine network driver for device.
7243 const char *netdev_drivername(const struct net_device
*dev
)
7245 const struct device_driver
*driver
;
7246 const struct device
*parent
;
7247 const char *empty
= "";
7249 parent
= dev
->dev
.parent
;
7253 driver
= parent
->driver
;
7254 if (driver
&& driver
->name
)
7255 return driver
->name
;
7259 static void __netdev_printk(const char *level
, const struct net_device
*dev
,
7260 struct va_format
*vaf
)
7262 if (dev
&& dev
->dev
.parent
) {
7263 dev_printk_emit(level
[1] - '0',
7266 dev_driver_string(dev
->dev
.parent
),
7267 dev_name(dev
->dev
.parent
),
7268 netdev_name(dev
), netdev_reg_state(dev
),
7271 printk("%s%s%s: %pV",
7272 level
, netdev_name(dev
), netdev_reg_state(dev
), vaf
);
7274 printk("%s(NULL net_device): %pV", level
, vaf
);
7278 void netdev_printk(const char *level
, const struct net_device
*dev
,
7279 const char *format
, ...)
7281 struct va_format vaf
;
7284 va_start(args
, format
);
7289 __netdev_printk(level
, dev
, &vaf
);
7293 EXPORT_SYMBOL(netdev_printk
);
7295 #define define_netdev_printk_level(func, level) \
7296 void func(const struct net_device *dev, const char *fmt, ...) \
7298 struct va_format vaf; \
7301 va_start(args, fmt); \
7306 __netdev_printk(level, dev, &vaf); \
7310 EXPORT_SYMBOL(func);
7312 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
7313 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
7314 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
7315 define_netdev_printk_level(netdev_err
, KERN_ERR
);
7316 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
7317 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
7318 define_netdev_printk_level(netdev_info
, KERN_INFO
);
7320 static void __net_exit
netdev_exit(struct net
*net
)
7322 kfree(net
->dev_name_head
);
7323 kfree(net
->dev_index_head
);
7326 static struct pernet_operations __net_initdata netdev_net_ops
= {
7327 .init
= netdev_init
,
7328 .exit
= netdev_exit
,
7331 static void __net_exit
default_device_exit(struct net
*net
)
7333 struct net_device
*dev
, *aux
;
7335 * Push all migratable network devices back to the
7336 * initial network namespace
7339 for_each_netdev_safe(net
, dev
, aux
) {
7341 char fb_name
[IFNAMSIZ
];
7343 /* Ignore unmoveable devices (i.e. loopback) */
7344 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7347 /* Leave virtual devices for the generic cleanup */
7348 if (dev
->rtnl_link_ops
)
7351 /* Push remaining network devices to init_net */
7352 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
7353 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
7355 pr_emerg("%s: failed to move %s to init_net: %d\n",
7356 __func__
, dev
->name
, err
);
7363 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
7365 /* Return with the rtnl_lock held when there are no network
7366 * devices unregistering in any network namespace in net_list.
7370 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
7372 add_wait_queue(&netdev_unregistering_wq
, &wait
);
7374 unregistering
= false;
7376 list_for_each_entry(net
, net_list
, exit_list
) {
7377 if (net
->dev_unreg_count
> 0) {
7378 unregistering
= true;
7386 wait_woken(&wait
, TASK_UNINTERRUPTIBLE
, MAX_SCHEDULE_TIMEOUT
);
7388 remove_wait_queue(&netdev_unregistering_wq
, &wait
);
7391 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
7393 /* At exit all network devices most be removed from a network
7394 * namespace. Do this in the reverse order of registration.
7395 * Do this across as many network namespaces as possible to
7396 * improve batching efficiency.
7398 struct net_device
*dev
;
7400 LIST_HEAD(dev_kill_list
);
7402 /* To prevent network device cleanup code from dereferencing
7403 * loopback devices or network devices that have been freed
7404 * wait here for all pending unregistrations to complete,
7405 * before unregistring the loopback device and allowing the
7406 * network namespace be freed.
7408 * The netdev todo list containing all network devices
7409 * unregistrations that happen in default_device_exit_batch
7410 * will run in the rtnl_unlock() at the end of
7411 * default_device_exit_batch.
7413 rtnl_lock_unregistering(net_list
);
7414 list_for_each_entry(net
, net_list
, exit_list
) {
7415 for_each_netdev_reverse(net
, dev
) {
7416 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
)
7417 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
7419 unregister_netdevice_queue(dev
, &dev_kill_list
);
7422 unregister_netdevice_many(&dev_kill_list
);
7426 static struct pernet_operations __net_initdata default_device_ops
= {
7427 .exit
= default_device_exit
,
7428 .exit_batch
= default_device_exit_batch
,
7432 * Initialize the DEV module. At boot time this walks the device list and
7433 * unhooks any devices that fail to initialise (normally hardware not
7434 * present) and leaves us with a valid list of present and active devices.
7439 * This is called single threaded during boot, so no need
7440 * to take the rtnl semaphore.
7442 static int __init
net_dev_init(void)
7444 int i
, rc
= -ENOMEM
;
7446 BUG_ON(!dev_boot_phase
);
7448 if (dev_proc_init())
7451 if (netdev_kobject_init())
7454 INIT_LIST_HEAD(&ptype_all
);
7455 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
7456 INIT_LIST_HEAD(&ptype_base
[i
]);
7458 INIT_LIST_HEAD(&offload_base
);
7460 if (register_pernet_subsys(&netdev_net_ops
))
7464 * Initialise the packet receive queues.
7467 for_each_possible_cpu(i
) {
7468 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
7470 skb_queue_head_init(&sd
->input_pkt_queue
);
7471 skb_queue_head_init(&sd
->process_queue
);
7472 INIT_LIST_HEAD(&sd
->poll_list
);
7473 sd
->output_queue_tailp
= &sd
->output_queue
;
7475 sd
->csd
.func
= rps_trigger_softirq
;
7480 sd
->backlog
.poll
= process_backlog
;
7481 sd
->backlog
.weight
= weight_p
;
7486 /* The loopback device is special if any other network devices
7487 * is present in a network namespace the loopback device must
7488 * be present. Since we now dynamically allocate and free the
7489 * loopback device ensure this invariant is maintained by
7490 * keeping the loopback device as the first device on the
7491 * list of network devices. Ensuring the loopback devices
7492 * is the first device that appears and the last network device
7495 if (register_pernet_device(&loopback_net_ops
))
7498 if (register_pernet_device(&default_device_ops
))
7501 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
7502 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
7504 hotcpu_notifier(dev_cpu_callback
, 0);
7511 subsys_initcall(net_dev_init
);