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 <net/busy_poll.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/stat.h>
103 #include <net/dst_metadata.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <net/xfrm.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/module.h>
110 #include <linux/netpoll.h>
111 #include <linux/rcupdate.h>
112 #include <linux/delay.h>
113 #include <net/iw_handler.h>
114 #include <asm/current.h>
115 #include <linux/audit.h>
116 #include <linux/dmaengine.h>
117 #include <linux/err.h>
118 #include <linux/ctype.h>
119 #include <linux/if_arp.h>
120 #include <linux/if_vlan.h>
121 #include <linux/ip.h>
123 #include <net/mpls.h>
124 #include <linux/ipv6.h>
125 #include <linux/in.h>
126 #include <linux/jhash.h>
127 #include <linux/random.h>
128 #include <trace/events/napi.h>
129 #include <trace/events/net.h>
130 #include <trace/events/skb.h>
131 #include <linux/pci.h>
132 #include <linux/inetdevice.h>
133 #include <linux/cpu_rmap.h>
134 #include <linux/static_key.h>
135 #include <linux/hashtable.h>
136 #include <linux/vmalloc.h>
137 #include <linux/if_macvlan.h>
138 #include <linux/errqueue.h>
139 #include <linux/hrtimer.h>
140 #include <linux/netfilter_ingress.h>
142 #include "net-sysfs.h"
144 /* Instead of increasing this, you should create a hash table. */
145 #define MAX_GRO_SKBS 8
147 /* This should be increased if a protocol with a bigger head is added. */
148 #define GRO_MAX_HEAD (MAX_HEADER + 128)
150 static DEFINE_SPINLOCK(ptype_lock
);
151 static DEFINE_SPINLOCK(offload_lock
);
152 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
153 struct list_head ptype_all __read_mostly
; /* Taps */
154 static struct list_head offload_base __read_mostly
;
156 static int netif_rx_internal(struct sk_buff
*skb
);
157 static int call_netdevice_notifiers_info(unsigned long val
,
158 struct net_device
*dev
,
159 struct netdev_notifier_info
*info
);
162 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
165 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
167 * Writers must hold the rtnl semaphore while they loop through the
168 * dev_base_head list, and hold dev_base_lock for writing when they do the
169 * actual updates. This allows pure readers to access the list even
170 * while a writer is preparing to update it.
172 * To put it another way, dev_base_lock is held for writing only to
173 * protect against pure readers; the rtnl semaphore provides the
174 * protection against other writers.
176 * See, for example usages, register_netdevice() and
177 * unregister_netdevice(), which must be called with the rtnl
180 DEFINE_RWLOCK(dev_base_lock
);
181 EXPORT_SYMBOL(dev_base_lock
);
183 /* protects napi_hash addition/deletion and napi_gen_id */
184 static DEFINE_SPINLOCK(napi_hash_lock
);
186 static unsigned int napi_gen_id
= NR_CPUS
;
187 static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash
, 8);
189 static seqcount_t devnet_rename_seq
;
191 static inline void dev_base_seq_inc(struct net
*net
)
193 while (++net
->dev_base_seq
== 0);
196 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
198 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
200 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
203 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
205 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
208 static inline void rps_lock(struct softnet_data
*sd
)
211 spin_lock(&sd
->input_pkt_queue
.lock
);
215 static inline void rps_unlock(struct softnet_data
*sd
)
218 spin_unlock(&sd
->input_pkt_queue
.lock
);
222 /* Device list insertion */
223 static void list_netdevice(struct net_device
*dev
)
225 struct net
*net
= dev_net(dev
);
229 write_lock_bh(&dev_base_lock
);
230 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
231 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
232 hlist_add_head_rcu(&dev
->index_hlist
,
233 dev_index_hash(net
, dev
->ifindex
));
234 write_unlock_bh(&dev_base_lock
);
236 dev_base_seq_inc(net
);
239 /* Device list removal
240 * caller must respect a RCU grace period before freeing/reusing dev
242 static void unlist_netdevice(struct net_device
*dev
)
246 /* Unlink dev from the device chain */
247 write_lock_bh(&dev_base_lock
);
248 list_del_rcu(&dev
->dev_list
);
249 hlist_del_rcu(&dev
->name_hlist
);
250 hlist_del_rcu(&dev
->index_hlist
);
251 write_unlock_bh(&dev_base_lock
);
253 dev_base_seq_inc(dev_net(dev
));
260 static RAW_NOTIFIER_HEAD(netdev_chain
);
263 * Device drivers call our routines to queue packets here. We empty the
264 * queue in the local softnet handler.
267 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
268 EXPORT_PER_CPU_SYMBOL(softnet_data
);
270 #ifdef CONFIG_LOCKDEP
272 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
273 * according to dev->type
275 static const unsigned short netdev_lock_type
[] =
276 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
277 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
278 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
279 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
280 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
281 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
282 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
283 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
284 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
285 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
286 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
287 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
288 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
289 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
290 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
292 static const char *const netdev_lock_name
[] =
293 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
294 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
295 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
296 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
297 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
298 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
299 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
300 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
301 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
302 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
303 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
304 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
305 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
306 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
307 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
309 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
310 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
312 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
316 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
317 if (netdev_lock_type
[i
] == dev_type
)
319 /* the last key is used by default */
320 return ARRAY_SIZE(netdev_lock_type
) - 1;
323 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
324 unsigned short dev_type
)
328 i
= netdev_lock_pos(dev_type
);
329 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
330 netdev_lock_name
[i
]);
333 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
337 i
= netdev_lock_pos(dev
->type
);
338 lockdep_set_class_and_name(&dev
->addr_list_lock
,
339 &netdev_addr_lock_key
[i
],
340 netdev_lock_name
[i
]);
343 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
344 unsigned short dev_type
)
347 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
352 /*******************************************************************************
354 Protocol management and registration routines
356 *******************************************************************************/
359 * Add a protocol ID to the list. Now that the input handler is
360 * smarter we can dispense with all the messy stuff that used to be
363 * BEWARE!!! Protocol handlers, mangling input packets,
364 * MUST BE last in hash buckets and checking protocol handlers
365 * MUST start from promiscuous ptype_all chain in net_bh.
366 * It is true now, do not change it.
367 * Explanation follows: if protocol handler, mangling packet, will
368 * be the first on list, it is not able to sense, that packet
369 * is cloned and should be copied-on-write, so that it will
370 * change it and subsequent readers will get broken packet.
374 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
376 if (pt
->type
== htons(ETH_P_ALL
))
377 return pt
->dev
? &pt
->dev
->ptype_all
: &ptype_all
;
379 return pt
->dev
? &pt
->dev
->ptype_specific
:
380 &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
384 * dev_add_pack - add packet handler
385 * @pt: packet type declaration
387 * Add a protocol handler to the networking stack. The passed &packet_type
388 * is linked into kernel lists and may not be freed until it has been
389 * removed from the kernel lists.
391 * This call does not sleep therefore it can not
392 * guarantee all CPU's that are in middle of receiving packets
393 * will see the new packet type (until the next received packet).
396 void dev_add_pack(struct packet_type
*pt
)
398 struct list_head
*head
= ptype_head(pt
);
400 spin_lock(&ptype_lock
);
401 list_add_rcu(&pt
->list
, head
);
402 spin_unlock(&ptype_lock
);
404 EXPORT_SYMBOL(dev_add_pack
);
407 * __dev_remove_pack - remove packet handler
408 * @pt: packet type declaration
410 * Remove a protocol handler that was previously added to the kernel
411 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
412 * from the kernel lists and can be freed or reused once this function
415 * The packet type might still be in use by receivers
416 * and must not be freed until after all the CPU's have gone
417 * through a quiescent state.
419 void __dev_remove_pack(struct packet_type
*pt
)
421 struct list_head
*head
= ptype_head(pt
);
422 struct packet_type
*pt1
;
424 spin_lock(&ptype_lock
);
426 list_for_each_entry(pt1
, head
, list
) {
428 list_del_rcu(&pt
->list
);
433 pr_warn("dev_remove_pack: %p not found\n", pt
);
435 spin_unlock(&ptype_lock
);
437 EXPORT_SYMBOL(__dev_remove_pack
);
440 * dev_remove_pack - remove packet handler
441 * @pt: packet type declaration
443 * Remove a protocol handler that was previously added to the kernel
444 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
445 * from the kernel lists and can be freed or reused once this function
448 * This call sleeps to guarantee that no CPU is looking at the packet
451 void dev_remove_pack(struct packet_type
*pt
)
453 __dev_remove_pack(pt
);
457 EXPORT_SYMBOL(dev_remove_pack
);
461 * dev_add_offload - register offload handlers
462 * @po: protocol offload declaration
464 * Add protocol offload handlers to the networking stack. The passed
465 * &proto_offload is linked into kernel lists and may not be freed until
466 * it has been removed from the kernel lists.
468 * This call does not sleep therefore it can not
469 * guarantee all CPU's that are in middle of receiving packets
470 * will see the new offload handlers (until the next received packet).
472 void dev_add_offload(struct packet_offload
*po
)
474 struct packet_offload
*elem
;
476 spin_lock(&offload_lock
);
477 list_for_each_entry(elem
, &offload_base
, list
) {
478 if (po
->priority
< elem
->priority
)
481 list_add_rcu(&po
->list
, elem
->list
.prev
);
482 spin_unlock(&offload_lock
);
484 EXPORT_SYMBOL(dev_add_offload
);
487 * __dev_remove_offload - remove offload handler
488 * @po: packet offload declaration
490 * Remove a protocol offload handler that was previously added to the
491 * kernel offload handlers by dev_add_offload(). The passed &offload_type
492 * is removed from the kernel lists and can be freed or reused once this
495 * The packet type might still be in use by receivers
496 * and must not be freed until after all the CPU's have gone
497 * through a quiescent state.
499 static void __dev_remove_offload(struct packet_offload
*po
)
501 struct list_head
*head
= &offload_base
;
502 struct packet_offload
*po1
;
504 spin_lock(&offload_lock
);
506 list_for_each_entry(po1
, head
, list
) {
508 list_del_rcu(&po
->list
);
513 pr_warn("dev_remove_offload: %p not found\n", po
);
515 spin_unlock(&offload_lock
);
519 * dev_remove_offload - remove packet offload handler
520 * @po: packet offload declaration
522 * Remove a packet offload handler that was previously added to the kernel
523 * offload handlers by dev_add_offload(). The passed &offload_type is
524 * removed from the kernel lists and can be freed or reused once this
527 * This call sleeps to guarantee that no CPU is looking at the packet
530 void dev_remove_offload(struct packet_offload
*po
)
532 __dev_remove_offload(po
);
536 EXPORT_SYMBOL(dev_remove_offload
);
538 /******************************************************************************
540 Device Boot-time Settings Routines
542 *******************************************************************************/
544 /* Boot time configuration table */
545 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
548 * netdev_boot_setup_add - add new setup entry
549 * @name: name of the device
550 * @map: configured settings for the device
552 * Adds new setup entry to the dev_boot_setup list. The function
553 * returns 0 on error and 1 on success. This is a generic routine to
556 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
558 struct netdev_boot_setup
*s
;
562 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
563 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
564 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
565 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
566 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
571 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
575 * netdev_boot_setup_check - check boot time settings
576 * @dev: the netdevice
578 * Check boot time settings for the device.
579 * The found settings are set for the device to be used
580 * later in the device probing.
581 * Returns 0 if no settings found, 1 if they are.
583 int netdev_boot_setup_check(struct net_device
*dev
)
585 struct netdev_boot_setup
*s
= dev_boot_setup
;
588 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
589 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
590 !strcmp(dev
->name
, s
[i
].name
)) {
591 dev
->irq
= s
[i
].map
.irq
;
592 dev
->base_addr
= s
[i
].map
.base_addr
;
593 dev
->mem_start
= s
[i
].map
.mem_start
;
594 dev
->mem_end
= s
[i
].map
.mem_end
;
600 EXPORT_SYMBOL(netdev_boot_setup_check
);
604 * netdev_boot_base - get address from boot time settings
605 * @prefix: prefix for network device
606 * @unit: id for network device
608 * Check boot time settings for the base address of device.
609 * The found settings are set for the device to be used
610 * later in the device probing.
611 * Returns 0 if no settings found.
613 unsigned long netdev_boot_base(const char *prefix
, int unit
)
615 const struct netdev_boot_setup
*s
= dev_boot_setup
;
619 sprintf(name
, "%s%d", prefix
, unit
);
622 * If device already registered then return base of 1
623 * to indicate not to probe for this interface
625 if (__dev_get_by_name(&init_net
, name
))
628 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
629 if (!strcmp(name
, s
[i
].name
))
630 return s
[i
].map
.base_addr
;
635 * Saves at boot time configured settings for any netdevice.
637 int __init
netdev_boot_setup(char *str
)
642 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
647 memset(&map
, 0, sizeof(map
));
651 map
.base_addr
= ints
[2];
653 map
.mem_start
= ints
[3];
655 map
.mem_end
= ints
[4];
657 /* Add new entry to the list */
658 return netdev_boot_setup_add(str
, &map
);
661 __setup("netdev=", netdev_boot_setup
);
663 /*******************************************************************************
665 Device Interface Subroutines
667 *******************************************************************************/
670 * dev_get_iflink - get 'iflink' value of a interface
671 * @dev: targeted interface
673 * Indicates the ifindex the interface is linked to.
674 * Physical interfaces have the same 'ifindex' and 'iflink' values.
677 int dev_get_iflink(const struct net_device
*dev
)
679 if (dev
->netdev_ops
&& dev
->netdev_ops
->ndo_get_iflink
)
680 return dev
->netdev_ops
->ndo_get_iflink(dev
);
684 EXPORT_SYMBOL(dev_get_iflink
);
687 * dev_fill_metadata_dst - Retrieve tunnel egress information.
688 * @dev: targeted interface
691 * For better visibility of tunnel traffic OVS needs to retrieve
692 * egress tunnel information for a packet. Following API allows
693 * user to get this info.
695 int dev_fill_metadata_dst(struct net_device
*dev
, struct sk_buff
*skb
)
697 struct ip_tunnel_info
*info
;
699 if (!dev
->netdev_ops
|| !dev
->netdev_ops
->ndo_fill_metadata_dst
)
702 info
= skb_tunnel_info_unclone(skb
);
705 if (unlikely(!(info
->mode
& IP_TUNNEL_INFO_TX
)))
708 return dev
->netdev_ops
->ndo_fill_metadata_dst(dev
, skb
);
710 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst
);
713 * __dev_get_by_name - find a device by its name
714 * @net: the applicable net namespace
715 * @name: name to find
717 * Find an interface by name. Must be called under RTNL semaphore
718 * or @dev_base_lock. If the name is found a pointer to the device
719 * is returned. If the name is not found then %NULL is returned. The
720 * reference counters are not incremented so the caller must be
721 * careful with locks.
724 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
726 struct net_device
*dev
;
727 struct hlist_head
*head
= dev_name_hash(net
, name
);
729 hlist_for_each_entry(dev
, head
, name_hlist
)
730 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
735 EXPORT_SYMBOL(__dev_get_by_name
);
738 * dev_get_by_name_rcu - find a device by its name
739 * @net: the applicable net namespace
740 * @name: name to find
742 * Find an interface by name.
743 * If the name is found a pointer to the device is returned.
744 * If the name is not found then %NULL is returned.
745 * The reference counters are not incremented so the caller must be
746 * careful with locks. The caller must hold RCU lock.
749 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
751 struct net_device
*dev
;
752 struct hlist_head
*head
= dev_name_hash(net
, name
);
754 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
755 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
760 EXPORT_SYMBOL(dev_get_by_name_rcu
);
763 * dev_get_by_name - find a device by its name
764 * @net: the applicable net namespace
765 * @name: name to find
767 * Find an interface by name. This can be called from any
768 * context and does its own locking. The returned handle has
769 * the usage count incremented and the caller must use dev_put() to
770 * release it when it is no longer needed. %NULL is returned if no
771 * matching device is found.
774 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
776 struct net_device
*dev
;
779 dev
= dev_get_by_name_rcu(net
, name
);
785 EXPORT_SYMBOL(dev_get_by_name
);
788 * __dev_get_by_index - find a device by its ifindex
789 * @net: the applicable net namespace
790 * @ifindex: index of device
792 * Search for an interface by index. Returns %NULL if the device
793 * is not found or a pointer to the device. The device has not
794 * had its reference counter increased so the caller must be careful
795 * about locking. The caller must hold either the RTNL semaphore
799 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
801 struct net_device
*dev
;
802 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
804 hlist_for_each_entry(dev
, head
, index_hlist
)
805 if (dev
->ifindex
== ifindex
)
810 EXPORT_SYMBOL(__dev_get_by_index
);
813 * dev_get_by_index_rcu - find a device by its ifindex
814 * @net: the applicable net namespace
815 * @ifindex: index of device
817 * Search for an interface by index. Returns %NULL if the device
818 * is not found or a pointer to the device. The device has not
819 * had its reference counter increased so the caller must be careful
820 * about locking. The caller must hold RCU lock.
823 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
825 struct net_device
*dev
;
826 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
828 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
829 if (dev
->ifindex
== ifindex
)
834 EXPORT_SYMBOL(dev_get_by_index_rcu
);
838 * dev_get_by_index - find a device by its ifindex
839 * @net: the applicable net namespace
840 * @ifindex: index of device
842 * Search for an interface by index. Returns NULL if the device
843 * is not found or a pointer to the device. The device returned has
844 * had a reference added and the pointer is safe until the user calls
845 * dev_put to indicate they have finished with it.
848 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
850 struct net_device
*dev
;
853 dev
= dev_get_by_index_rcu(net
, ifindex
);
859 EXPORT_SYMBOL(dev_get_by_index
);
862 * netdev_get_name - get a netdevice name, knowing its ifindex.
863 * @net: network namespace
864 * @name: a pointer to the buffer where the name will be stored.
865 * @ifindex: the ifindex of the interface to get the name from.
867 * The use of raw_seqcount_begin() and cond_resched() before
868 * retrying is required as we want to give the writers a chance
869 * to complete when CONFIG_PREEMPT is not set.
871 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
873 struct net_device
*dev
;
877 seq
= raw_seqcount_begin(&devnet_rename_seq
);
879 dev
= dev_get_by_index_rcu(net
, ifindex
);
885 strcpy(name
, dev
->name
);
887 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
896 * dev_getbyhwaddr_rcu - find a device by its hardware address
897 * @net: the applicable net namespace
898 * @type: media type of device
899 * @ha: hardware address
901 * Search for an interface by MAC address. Returns NULL if the device
902 * is not found or a pointer to the device.
903 * The caller must hold RCU or RTNL.
904 * The returned device has not had its ref count increased
905 * and the caller must therefore be careful about locking
909 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
912 struct net_device
*dev
;
914 for_each_netdev_rcu(net
, dev
)
915 if (dev
->type
== type
&&
916 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
921 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
923 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
925 struct net_device
*dev
;
928 for_each_netdev(net
, dev
)
929 if (dev
->type
== type
)
934 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
936 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
938 struct net_device
*dev
, *ret
= NULL
;
941 for_each_netdev_rcu(net
, dev
)
942 if (dev
->type
== type
) {
950 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
953 * __dev_get_by_flags - find any device with given flags
954 * @net: the applicable net namespace
955 * @if_flags: IFF_* values
956 * @mask: bitmask of bits in if_flags to check
958 * Search for any interface with the given flags. Returns NULL if a device
959 * is not found or a pointer to the device. Must be called inside
960 * rtnl_lock(), and result refcount is unchanged.
963 struct net_device
*__dev_get_by_flags(struct net
*net
, unsigned short if_flags
,
966 struct net_device
*dev
, *ret
;
971 for_each_netdev(net
, dev
) {
972 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
979 EXPORT_SYMBOL(__dev_get_by_flags
);
982 * dev_valid_name - check if name is okay for network device
985 * Network device names need to be valid file names to
986 * to allow sysfs to work. We also disallow any kind of
989 bool dev_valid_name(const char *name
)
993 if (strlen(name
) >= IFNAMSIZ
)
995 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
999 if (*name
== '/' || *name
== ':' || isspace(*name
))
1005 EXPORT_SYMBOL(dev_valid_name
);
1008 * __dev_alloc_name - allocate a name for a device
1009 * @net: network namespace to allocate the device name in
1010 * @name: name format string
1011 * @buf: scratch buffer and result name string
1013 * Passed a format string - eg "lt%d" it will try and find a suitable
1014 * id. It scans list of devices to build up a free map, then chooses
1015 * the first empty slot. The caller must hold the dev_base or rtnl lock
1016 * while allocating the name and adding the device in order to avoid
1018 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1019 * Returns the number of the unit assigned or a negative errno code.
1022 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
1026 const int max_netdevices
= 8*PAGE_SIZE
;
1027 unsigned long *inuse
;
1028 struct net_device
*d
;
1030 p
= strnchr(name
, IFNAMSIZ
-1, '%');
1033 * Verify the string as this thing may have come from
1034 * the user. There must be either one "%d" and no other "%"
1037 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
1040 /* Use one page as a bit array of possible slots */
1041 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
1045 for_each_netdev(net
, d
) {
1046 if (!sscanf(d
->name
, name
, &i
))
1048 if (i
< 0 || i
>= max_netdevices
)
1051 /* avoid cases where sscanf is not exact inverse of printf */
1052 snprintf(buf
, IFNAMSIZ
, name
, i
);
1053 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
1057 i
= find_first_zero_bit(inuse
, max_netdevices
);
1058 free_page((unsigned long) inuse
);
1062 snprintf(buf
, IFNAMSIZ
, name
, i
);
1063 if (!__dev_get_by_name(net
, buf
))
1066 /* It is possible to run out of possible slots
1067 * when the name is long and there isn't enough space left
1068 * for the digits, or if all bits are used.
1074 * dev_alloc_name - allocate a name for a device
1076 * @name: name format string
1078 * Passed a format string - eg "lt%d" it will try and find a suitable
1079 * id. It scans list of devices to build up a free map, then chooses
1080 * the first empty slot. The caller must hold the dev_base or rtnl lock
1081 * while allocating the name and adding the device in order to avoid
1083 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1084 * Returns the number of the unit assigned or a negative errno code.
1087 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1093 BUG_ON(!dev_net(dev
));
1095 ret
= __dev_alloc_name(net
, name
, buf
);
1097 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1100 EXPORT_SYMBOL(dev_alloc_name
);
1102 static int dev_alloc_name_ns(struct net
*net
,
1103 struct net_device
*dev
,
1109 ret
= __dev_alloc_name(net
, name
, buf
);
1111 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1115 static int dev_get_valid_name(struct net
*net
,
1116 struct net_device
*dev
,
1121 if (!dev_valid_name(name
))
1124 if (strchr(name
, '%'))
1125 return dev_alloc_name_ns(net
, dev
, name
);
1126 else if (__dev_get_by_name(net
, name
))
1128 else if (dev
->name
!= name
)
1129 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1135 * dev_change_name - change name of a device
1137 * @newname: name (or format string) must be at least IFNAMSIZ
1139 * Change name of a device, can pass format strings "eth%d".
1142 int dev_change_name(struct net_device
*dev
, const char *newname
)
1144 unsigned char old_assign_type
;
1145 char oldname
[IFNAMSIZ
];
1151 BUG_ON(!dev_net(dev
));
1154 if (dev
->flags
& IFF_UP
)
1157 write_seqcount_begin(&devnet_rename_seq
);
1159 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1160 write_seqcount_end(&devnet_rename_seq
);
1164 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1166 err
= dev_get_valid_name(net
, dev
, newname
);
1168 write_seqcount_end(&devnet_rename_seq
);
1172 if (oldname
[0] && !strchr(oldname
, '%'))
1173 netdev_info(dev
, "renamed from %s\n", oldname
);
1175 old_assign_type
= dev
->name_assign_type
;
1176 dev
->name_assign_type
= NET_NAME_RENAMED
;
1179 ret
= device_rename(&dev
->dev
, dev
->name
);
1181 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1182 dev
->name_assign_type
= old_assign_type
;
1183 write_seqcount_end(&devnet_rename_seq
);
1187 write_seqcount_end(&devnet_rename_seq
);
1189 netdev_adjacent_rename_links(dev
, oldname
);
1191 write_lock_bh(&dev_base_lock
);
1192 hlist_del_rcu(&dev
->name_hlist
);
1193 write_unlock_bh(&dev_base_lock
);
1197 write_lock_bh(&dev_base_lock
);
1198 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1199 write_unlock_bh(&dev_base_lock
);
1201 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1202 ret
= notifier_to_errno(ret
);
1205 /* err >= 0 after dev_alloc_name() or stores the first errno */
1208 write_seqcount_begin(&devnet_rename_seq
);
1209 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1210 memcpy(oldname
, newname
, IFNAMSIZ
);
1211 dev
->name_assign_type
= old_assign_type
;
1212 old_assign_type
= NET_NAME_RENAMED
;
1215 pr_err("%s: name change rollback failed: %d\n",
1224 * dev_set_alias - change ifalias of a device
1226 * @alias: name up to IFALIASZ
1227 * @len: limit of bytes to copy from info
1229 * Set ifalias for a device,
1231 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1237 if (len
>= IFALIASZ
)
1241 kfree(dev
->ifalias
);
1242 dev
->ifalias
= NULL
;
1246 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1249 dev
->ifalias
= new_ifalias
;
1251 strlcpy(dev
->ifalias
, alias
, len
+1);
1257 * netdev_features_change - device changes features
1258 * @dev: device to cause notification
1260 * Called to indicate a device has changed features.
1262 void netdev_features_change(struct net_device
*dev
)
1264 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1266 EXPORT_SYMBOL(netdev_features_change
);
1269 * netdev_state_change - device changes state
1270 * @dev: device to cause notification
1272 * Called to indicate a device has changed state. This function calls
1273 * the notifier chains for netdev_chain and sends a NEWLINK message
1274 * to the routing socket.
1276 void netdev_state_change(struct net_device
*dev
)
1278 if (dev
->flags
& IFF_UP
) {
1279 struct netdev_notifier_change_info change_info
;
1281 change_info
.flags_changed
= 0;
1282 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
1284 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1287 EXPORT_SYMBOL(netdev_state_change
);
1290 * netdev_notify_peers - notify network peers about existence of @dev
1291 * @dev: network device
1293 * Generate traffic such that interested network peers are aware of
1294 * @dev, such as by generating a gratuitous ARP. This may be used when
1295 * a device wants to inform the rest of the network about some sort of
1296 * reconfiguration such as a failover event or virtual machine
1299 void netdev_notify_peers(struct net_device
*dev
)
1302 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1305 EXPORT_SYMBOL(netdev_notify_peers
);
1307 static int __dev_open(struct net_device
*dev
)
1309 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1314 if (!netif_device_present(dev
))
1317 /* Block netpoll from trying to do any rx path servicing.
1318 * If we don't do this there is a chance ndo_poll_controller
1319 * or ndo_poll may be running while we open the device
1321 netpoll_poll_disable(dev
);
1323 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1324 ret
= notifier_to_errno(ret
);
1328 set_bit(__LINK_STATE_START
, &dev
->state
);
1330 if (ops
->ndo_validate_addr
)
1331 ret
= ops
->ndo_validate_addr(dev
);
1333 if (!ret
&& ops
->ndo_open
)
1334 ret
= ops
->ndo_open(dev
);
1336 netpoll_poll_enable(dev
);
1339 clear_bit(__LINK_STATE_START
, &dev
->state
);
1341 dev
->flags
|= IFF_UP
;
1342 dev_set_rx_mode(dev
);
1344 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1351 * dev_open - prepare an interface for use.
1352 * @dev: device to open
1354 * Takes a device from down to up state. The device's private open
1355 * function is invoked and then the multicast lists are loaded. Finally
1356 * the device is moved into the up state and a %NETDEV_UP message is
1357 * sent to the netdev notifier chain.
1359 * Calling this function on an active interface is a nop. On a failure
1360 * a negative errno code is returned.
1362 int dev_open(struct net_device
*dev
)
1366 if (dev
->flags
& IFF_UP
)
1369 ret
= __dev_open(dev
);
1373 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1374 call_netdevice_notifiers(NETDEV_UP
, dev
);
1378 EXPORT_SYMBOL(dev_open
);
1380 static int __dev_close_many(struct list_head
*head
)
1382 struct net_device
*dev
;
1387 list_for_each_entry(dev
, head
, close_list
) {
1388 /* Temporarily disable netpoll until the interface is down */
1389 netpoll_poll_disable(dev
);
1391 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1393 clear_bit(__LINK_STATE_START
, &dev
->state
);
1395 /* Synchronize to scheduled poll. We cannot touch poll list, it
1396 * can be even on different cpu. So just clear netif_running().
1398 * dev->stop() will invoke napi_disable() on all of it's
1399 * napi_struct instances on this device.
1401 smp_mb__after_atomic(); /* Commit netif_running(). */
1404 dev_deactivate_many(head
);
1406 list_for_each_entry(dev
, head
, close_list
) {
1407 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1410 * Call the device specific close. This cannot fail.
1411 * Only if device is UP
1413 * We allow it to be called even after a DETACH hot-plug
1419 dev
->flags
&= ~IFF_UP
;
1420 netpoll_poll_enable(dev
);
1426 static int __dev_close(struct net_device
*dev
)
1431 list_add(&dev
->close_list
, &single
);
1432 retval
= __dev_close_many(&single
);
1438 int dev_close_many(struct list_head
*head
, bool unlink
)
1440 struct net_device
*dev
, *tmp
;
1442 /* Remove the devices that don't need to be closed */
1443 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1444 if (!(dev
->flags
& IFF_UP
))
1445 list_del_init(&dev
->close_list
);
1447 __dev_close_many(head
);
1449 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1450 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1451 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1453 list_del_init(&dev
->close_list
);
1458 EXPORT_SYMBOL(dev_close_many
);
1461 * dev_close - shutdown an interface.
1462 * @dev: device to shutdown
1464 * This function moves an active device into down state. A
1465 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1466 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1469 int dev_close(struct net_device
*dev
)
1471 if (dev
->flags
& IFF_UP
) {
1474 list_add(&dev
->close_list
, &single
);
1475 dev_close_many(&single
, true);
1480 EXPORT_SYMBOL(dev_close
);
1484 * dev_disable_lro - disable Large Receive Offload on a device
1487 * Disable Large Receive Offload (LRO) on a net device. Must be
1488 * called under RTNL. This is needed if received packets may be
1489 * forwarded to another interface.
1491 void dev_disable_lro(struct net_device
*dev
)
1493 struct net_device
*lower_dev
;
1494 struct list_head
*iter
;
1496 dev
->wanted_features
&= ~NETIF_F_LRO
;
1497 netdev_update_features(dev
);
1499 if (unlikely(dev
->features
& NETIF_F_LRO
))
1500 netdev_WARN(dev
, "failed to disable LRO!\n");
1502 netdev_for_each_lower_dev(dev
, lower_dev
, iter
)
1503 dev_disable_lro(lower_dev
);
1505 EXPORT_SYMBOL(dev_disable_lro
);
1507 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1508 struct net_device
*dev
)
1510 struct netdev_notifier_info info
;
1512 netdev_notifier_info_init(&info
, dev
);
1513 return nb
->notifier_call(nb
, val
, &info
);
1516 static int dev_boot_phase
= 1;
1519 * register_netdevice_notifier - register a network notifier block
1522 * Register a notifier to be called when network device events occur.
1523 * The notifier passed is linked into the kernel structures and must
1524 * not be reused until it has been unregistered. A negative errno code
1525 * is returned on a failure.
1527 * When registered all registration and up events are replayed
1528 * to the new notifier to allow device to have a race free
1529 * view of the network device list.
1532 int register_netdevice_notifier(struct notifier_block
*nb
)
1534 struct net_device
*dev
;
1535 struct net_device
*last
;
1540 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1546 for_each_netdev(net
, dev
) {
1547 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1548 err
= notifier_to_errno(err
);
1552 if (!(dev
->flags
& IFF_UP
))
1555 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1566 for_each_netdev(net
, dev
) {
1570 if (dev
->flags
& IFF_UP
) {
1571 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1573 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1575 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1580 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1583 EXPORT_SYMBOL(register_netdevice_notifier
);
1586 * unregister_netdevice_notifier - unregister a network notifier block
1589 * Unregister a notifier previously registered by
1590 * register_netdevice_notifier(). The notifier is unlinked into the
1591 * kernel structures and may then be reused. A negative errno code
1592 * is returned on a failure.
1594 * After unregistering unregister and down device events are synthesized
1595 * for all devices on the device list to the removed notifier to remove
1596 * the need for special case cleanup code.
1599 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1601 struct net_device
*dev
;
1606 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1611 for_each_netdev(net
, dev
) {
1612 if (dev
->flags
& IFF_UP
) {
1613 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1615 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1617 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1624 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1627 * call_netdevice_notifiers_info - call all network notifier blocks
1628 * @val: value passed unmodified to notifier function
1629 * @dev: net_device pointer passed unmodified to notifier function
1630 * @info: notifier information data
1632 * Call all network notifier blocks. Parameters and return value
1633 * are as for raw_notifier_call_chain().
1636 static int call_netdevice_notifiers_info(unsigned long val
,
1637 struct net_device
*dev
,
1638 struct netdev_notifier_info
*info
)
1641 netdev_notifier_info_init(info
, dev
);
1642 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1646 * call_netdevice_notifiers - call all network notifier blocks
1647 * @val: value passed unmodified to notifier function
1648 * @dev: net_device pointer passed unmodified to notifier function
1650 * Call all network notifier blocks. Parameters and return value
1651 * are as for raw_notifier_call_chain().
1654 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1656 struct netdev_notifier_info info
;
1658 return call_netdevice_notifiers_info(val
, dev
, &info
);
1660 EXPORT_SYMBOL(call_netdevice_notifiers
);
1662 #ifdef CONFIG_NET_INGRESS
1663 static struct static_key ingress_needed __read_mostly
;
1665 void net_inc_ingress_queue(void)
1667 static_key_slow_inc(&ingress_needed
);
1669 EXPORT_SYMBOL_GPL(net_inc_ingress_queue
);
1671 void net_dec_ingress_queue(void)
1673 static_key_slow_dec(&ingress_needed
);
1675 EXPORT_SYMBOL_GPL(net_dec_ingress_queue
);
1678 static struct static_key netstamp_needed __read_mostly
;
1679 #ifdef HAVE_JUMP_LABEL
1680 /* We are not allowed to call static_key_slow_dec() from irq context
1681 * If net_disable_timestamp() is called from irq context, defer the
1682 * static_key_slow_dec() calls.
1684 static atomic_t netstamp_needed_deferred
;
1687 void net_enable_timestamp(void)
1689 #ifdef HAVE_JUMP_LABEL
1690 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1694 static_key_slow_dec(&netstamp_needed
);
1698 static_key_slow_inc(&netstamp_needed
);
1700 EXPORT_SYMBOL(net_enable_timestamp
);
1702 void net_disable_timestamp(void)
1704 #ifdef HAVE_JUMP_LABEL
1705 if (in_interrupt()) {
1706 atomic_inc(&netstamp_needed_deferred
);
1710 static_key_slow_dec(&netstamp_needed
);
1712 EXPORT_SYMBOL(net_disable_timestamp
);
1714 static inline void net_timestamp_set(struct sk_buff
*skb
)
1716 skb
->tstamp
.tv64
= 0;
1717 if (static_key_false(&netstamp_needed
))
1718 __net_timestamp(skb
);
1721 #define net_timestamp_check(COND, SKB) \
1722 if (static_key_false(&netstamp_needed)) { \
1723 if ((COND) && !(SKB)->tstamp.tv64) \
1724 __net_timestamp(SKB); \
1727 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1731 if (!(dev
->flags
& IFF_UP
))
1734 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1735 if (skb
->len
<= len
)
1738 /* if TSO is enabled, we don't care about the length as the packet
1739 * could be forwarded without being segmented before
1741 if (skb_is_gso(skb
))
1746 EXPORT_SYMBOL_GPL(is_skb_forwardable
);
1748 int __dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1750 if (skb_orphan_frags(skb
, GFP_ATOMIC
) ||
1751 unlikely(!is_skb_forwardable(dev
, skb
))) {
1752 atomic_long_inc(&dev
->rx_dropped
);
1757 skb_scrub_packet(skb
, true);
1759 skb
->protocol
= eth_type_trans(skb
, dev
);
1760 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
1764 EXPORT_SYMBOL_GPL(__dev_forward_skb
);
1767 * dev_forward_skb - loopback an skb to another netif
1769 * @dev: destination network device
1770 * @skb: buffer to forward
1773 * NET_RX_SUCCESS (no congestion)
1774 * NET_RX_DROP (packet was dropped, but freed)
1776 * dev_forward_skb can be used for injecting an skb from the
1777 * start_xmit function of one device into the receive queue
1778 * of another device.
1780 * The receiving device may be in another namespace, so
1781 * we have to clear all information in the skb that could
1782 * impact namespace isolation.
1784 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1786 return __dev_forward_skb(dev
, skb
) ?: netif_rx_internal(skb
);
1788 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1790 static inline int deliver_skb(struct sk_buff
*skb
,
1791 struct packet_type
*pt_prev
,
1792 struct net_device
*orig_dev
)
1794 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1796 atomic_inc(&skb
->users
);
1797 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1800 static inline void deliver_ptype_list_skb(struct sk_buff
*skb
,
1801 struct packet_type
**pt
,
1802 struct net_device
*orig_dev
,
1804 struct list_head
*ptype_list
)
1806 struct packet_type
*ptype
, *pt_prev
= *pt
;
1808 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1809 if (ptype
->type
!= type
)
1812 deliver_skb(skb
, pt_prev
, orig_dev
);
1818 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1820 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1823 if (ptype
->id_match
)
1824 return ptype
->id_match(ptype
, skb
->sk
);
1825 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1832 * Support routine. Sends outgoing frames to any network
1833 * taps currently in use.
1836 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1838 struct packet_type
*ptype
;
1839 struct sk_buff
*skb2
= NULL
;
1840 struct packet_type
*pt_prev
= NULL
;
1841 struct list_head
*ptype_list
= &ptype_all
;
1845 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1846 /* Never send packets back to the socket
1847 * they originated from - MvS (miquels@drinkel.ow.org)
1849 if (skb_loop_sk(ptype
, skb
))
1853 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1858 /* need to clone skb, done only once */
1859 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1863 net_timestamp_set(skb2
);
1865 /* skb->nh should be correctly
1866 * set by sender, so that the second statement is
1867 * just protection against buggy protocols.
1869 skb_reset_mac_header(skb2
);
1871 if (skb_network_header(skb2
) < skb2
->data
||
1872 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1873 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1874 ntohs(skb2
->protocol
),
1876 skb_reset_network_header(skb2
);
1879 skb2
->transport_header
= skb2
->network_header
;
1880 skb2
->pkt_type
= PACKET_OUTGOING
;
1884 if (ptype_list
== &ptype_all
) {
1885 ptype_list
= &dev
->ptype_all
;
1890 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1895 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1896 * @dev: Network device
1897 * @txq: number of queues available
1899 * If real_num_tx_queues is changed the tc mappings may no longer be
1900 * valid. To resolve this verify the tc mapping remains valid and if
1901 * not NULL the mapping. With no priorities mapping to this
1902 * offset/count pair it will no longer be used. In the worst case TC0
1903 * is invalid nothing can be done so disable priority mappings. If is
1904 * expected that drivers will fix this mapping if they can before
1905 * calling netif_set_real_num_tx_queues.
1907 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1910 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1912 /* If TC0 is invalidated disable TC mapping */
1913 if (tc
->offset
+ tc
->count
> txq
) {
1914 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1919 /* Invalidated prio to tc mappings set to TC0 */
1920 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1921 int q
= netdev_get_prio_tc_map(dev
, i
);
1923 tc
= &dev
->tc_to_txq
[q
];
1924 if (tc
->offset
+ tc
->count
> txq
) {
1925 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1927 netdev_set_prio_tc_map(dev
, i
, 0);
1933 static DEFINE_MUTEX(xps_map_mutex
);
1934 #define xmap_dereference(P) \
1935 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1937 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1940 struct xps_map
*map
= NULL
;
1944 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1946 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1947 if (map
->queues
[pos
] == index
) {
1949 map
->queues
[pos
] = map
->queues
[--map
->len
];
1951 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1952 kfree_rcu(map
, rcu
);
1962 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1964 struct xps_dev_maps
*dev_maps
;
1966 bool active
= false;
1968 mutex_lock(&xps_map_mutex
);
1969 dev_maps
= xmap_dereference(dev
->xps_maps
);
1974 for_each_possible_cpu(cpu
) {
1975 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1976 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1979 if (i
== dev
->num_tx_queues
)
1984 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1985 kfree_rcu(dev_maps
, rcu
);
1988 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1989 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1993 mutex_unlock(&xps_map_mutex
);
1996 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1999 struct xps_map
*new_map
;
2000 int alloc_len
= XPS_MIN_MAP_ALLOC
;
2003 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
2004 if (map
->queues
[pos
] != index
)
2009 /* Need to add queue to this CPU's existing map */
2011 if (pos
< map
->alloc_len
)
2014 alloc_len
= map
->alloc_len
* 2;
2017 /* Need to allocate new map to store queue on this CPU's map */
2018 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
2023 for (i
= 0; i
< pos
; i
++)
2024 new_map
->queues
[i
] = map
->queues
[i
];
2025 new_map
->alloc_len
= alloc_len
;
2031 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
2034 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
2035 struct xps_map
*map
, *new_map
;
2036 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
2037 int cpu
, numa_node_id
= -2;
2038 bool active
= false;
2040 mutex_lock(&xps_map_mutex
);
2042 dev_maps
= xmap_dereference(dev
->xps_maps
);
2044 /* allocate memory for queue storage */
2045 for_each_online_cpu(cpu
) {
2046 if (!cpumask_test_cpu(cpu
, mask
))
2050 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
2051 if (!new_dev_maps
) {
2052 mutex_unlock(&xps_map_mutex
);
2056 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2059 map
= expand_xps_map(map
, cpu
, index
);
2063 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2067 goto out_no_new_maps
;
2069 for_each_possible_cpu(cpu
) {
2070 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
2071 /* add queue to CPU maps */
2074 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2075 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
2078 if (pos
== map
->len
)
2079 map
->queues
[map
->len
++] = index
;
2081 if (numa_node_id
== -2)
2082 numa_node_id
= cpu_to_node(cpu
);
2083 else if (numa_node_id
!= cpu_to_node(cpu
))
2086 } else if (dev_maps
) {
2087 /* fill in the new device map from the old device map */
2088 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2089 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2094 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
2096 /* Cleanup old maps */
2098 for_each_possible_cpu(cpu
) {
2099 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2100 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2101 if (map
&& map
!= new_map
)
2102 kfree_rcu(map
, rcu
);
2105 kfree_rcu(dev_maps
, rcu
);
2108 dev_maps
= new_dev_maps
;
2112 /* update Tx queue numa node */
2113 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2114 (numa_node_id
>= 0) ? numa_node_id
:
2120 /* removes queue from unused CPUs */
2121 for_each_possible_cpu(cpu
) {
2122 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2125 if (remove_xps_queue(dev_maps
, cpu
, index
))
2129 /* free map if not active */
2131 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2132 kfree_rcu(dev_maps
, rcu
);
2136 mutex_unlock(&xps_map_mutex
);
2140 /* remove any maps that we added */
2141 for_each_possible_cpu(cpu
) {
2142 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2143 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2145 if (new_map
&& new_map
!= map
)
2149 mutex_unlock(&xps_map_mutex
);
2151 kfree(new_dev_maps
);
2154 EXPORT_SYMBOL(netif_set_xps_queue
);
2158 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2159 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2161 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2165 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2168 if (dev
->reg_state
== NETREG_REGISTERED
||
2169 dev
->reg_state
== NETREG_UNREGISTERING
) {
2172 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2178 netif_setup_tc(dev
, txq
);
2180 if (txq
< dev
->real_num_tx_queues
) {
2181 qdisc_reset_all_tx_gt(dev
, txq
);
2183 netif_reset_xps_queues_gt(dev
, txq
);
2188 dev
->real_num_tx_queues
= txq
;
2191 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2195 * netif_set_real_num_rx_queues - set actual number of RX queues used
2196 * @dev: Network device
2197 * @rxq: Actual number of RX queues
2199 * This must be called either with the rtnl_lock held or before
2200 * registration of the net device. Returns 0 on success, or a
2201 * negative error code. If called before registration, it always
2204 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2208 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2211 if (dev
->reg_state
== NETREG_REGISTERED
) {
2214 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2220 dev
->real_num_rx_queues
= rxq
;
2223 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2227 * netif_get_num_default_rss_queues - default number of RSS queues
2229 * This routine should set an upper limit on the number of RSS queues
2230 * used by default by multiqueue devices.
2232 int netif_get_num_default_rss_queues(void)
2234 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2236 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2238 static inline void __netif_reschedule(struct Qdisc
*q
)
2240 struct softnet_data
*sd
;
2241 unsigned long flags
;
2243 local_irq_save(flags
);
2244 sd
= this_cpu_ptr(&softnet_data
);
2245 q
->next_sched
= NULL
;
2246 *sd
->output_queue_tailp
= q
;
2247 sd
->output_queue_tailp
= &q
->next_sched
;
2248 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2249 local_irq_restore(flags
);
2252 void __netif_schedule(struct Qdisc
*q
)
2254 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2255 __netif_reschedule(q
);
2257 EXPORT_SYMBOL(__netif_schedule
);
2259 struct dev_kfree_skb_cb
{
2260 enum skb_free_reason reason
;
2263 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2265 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2268 void netif_schedule_queue(struct netdev_queue
*txq
)
2271 if (!(txq
->state
& QUEUE_STATE_ANY_XOFF
)) {
2272 struct Qdisc
*q
= rcu_dereference(txq
->qdisc
);
2274 __netif_schedule(q
);
2278 EXPORT_SYMBOL(netif_schedule_queue
);
2281 * netif_wake_subqueue - allow sending packets on subqueue
2282 * @dev: network device
2283 * @queue_index: sub queue index
2285 * Resume individual transmit queue of a device with multiple transmit queues.
2287 void netif_wake_subqueue(struct net_device
*dev
, u16 queue_index
)
2289 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
2291 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &txq
->state
)) {
2295 q
= rcu_dereference(txq
->qdisc
);
2296 __netif_schedule(q
);
2300 EXPORT_SYMBOL(netif_wake_subqueue
);
2302 void netif_tx_wake_queue(struct netdev_queue
*dev_queue
)
2304 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &dev_queue
->state
)) {
2308 q
= rcu_dereference(dev_queue
->qdisc
);
2309 __netif_schedule(q
);
2313 EXPORT_SYMBOL(netif_tx_wake_queue
);
2315 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2317 unsigned long flags
;
2319 if (likely(atomic_read(&skb
->users
) == 1)) {
2321 atomic_set(&skb
->users
, 0);
2322 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2325 get_kfree_skb_cb(skb
)->reason
= reason
;
2326 local_irq_save(flags
);
2327 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2328 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2329 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2330 local_irq_restore(flags
);
2332 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2334 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2336 if (in_irq() || irqs_disabled())
2337 __dev_kfree_skb_irq(skb
, reason
);
2341 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2345 * netif_device_detach - mark device as removed
2346 * @dev: network device
2348 * Mark device as removed from system and therefore no longer available.
2350 void netif_device_detach(struct net_device
*dev
)
2352 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2353 netif_running(dev
)) {
2354 netif_tx_stop_all_queues(dev
);
2357 EXPORT_SYMBOL(netif_device_detach
);
2360 * netif_device_attach - mark device as attached
2361 * @dev: network device
2363 * Mark device as attached from system and restart if needed.
2365 void netif_device_attach(struct net_device
*dev
)
2367 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2368 netif_running(dev
)) {
2369 netif_tx_wake_all_queues(dev
);
2370 __netdev_watchdog_up(dev
);
2373 EXPORT_SYMBOL(netif_device_attach
);
2376 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2377 * to be used as a distribution range.
2379 u16
__skb_tx_hash(const struct net_device
*dev
, struct sk_buff
*skb
,
2380 unsigned int num_tx_queues
)
2384 u16 qcount
= num_tx_queues
;
2386 if (skb_rx_queue_recorded(skb
)) {
2387 hash
= skb_get_rx_queue(skb
);
2388 while (unlikely(hash
>= num_tx_queues
))
2389 hash
-= num_tx_queues
;
2394 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2395 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2396 qcount
= dev
->tc_to_txq
[tc
].count
;
2399 return (u16
) reciprocal_scale(skb_get_hash(skb
), qcount
) + qoffset
;
2401 EXPORT_SYMBOL(__skb_tx_hash
);
2403 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2405 static const netdev_features_t null_features
= 0;
2406 struct net_device
*dev
= skb
->dev
;
2407 const char *name
= "";
2409 if (!net_ratelimit())
2413 if (dev
->dev
.parent
)
2414 name
= dev_driver_string(dev
->dev
.parent
);
2416 name
= netdev_name(dev
);
2418 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2419 "gso_type=%d ip_summed=%d\n",
2420 name
, dev
? &dev
->features
: &null_features
,
2421 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2422 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2423 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2427 * Invalidate hardware checksum when packet is to be mangled, and
2428 * complete checksum manually on outgoing path.
2430 int skb_checksum_help(struct sk_buff
*skb
)
2433 int ret
= 0, offset
;
2435 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2436 goto out_set_summed
;
2438 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2439 skb_warn_bad_offload(skb
);
2443 /* Before computing a checksum, we should make sure no frag could
2444 * be modified by an external entity : checksum could be wrong.
2446 if (skb_has_shared_frag(skb
)) {
2447 ret
= __skb_linearize(skb
);
2452 offset
= skb_checksum_start_offset(skb
);
2453 BUG_ON(offset
>= skb_headlen(skb
));
2454 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2456 offset
+= skb
->csum_offset
;
2457 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2459 if (skb_cloned(skb
) &&
2460 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2461 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2466 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2468 skb
->ip_summed
= CHECKSUM_NONE
;
2472 EXPORT_SYMBOL(skb_checksum_help
);
2474 __be16
skb_network_protocol(struct sk_buff
*skb
, int *depth
)
2476 __be16 type
= skb
->protocol
;
2478 /* Tunnel gso handlers can set protocol to ethernet. */
2479 if (type
== htons(ETH_P_TEB
)) {
2482 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2485 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2486 type
= eth
->h_proto
;
2489 return __vlan_get_protocol(skb
, type
, depth
);
2493 * skb_mac_gso_segment - mac layer segmentation handler.
2494 * @skb: buffer to segment
2495 * @features: features for the output path (see dev->features)
2497 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2498 netdev_features_t features
)
2500 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2501 struct packet_offload
*ptype
;
2502 int vlan_depth
= skb
->mac_len
;
2503 __be16 type
= skb_network_protocol(skb
, &vlan_depth
);
2505 if (unlikely(!type
))
2506 return ERR_PTR(-EINVAL
);
2508 __skb_pull(skb
, vlan_depth
);
2511 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2512 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2513 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2519 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2523 EXPORT_SYMBOL(skb_mac_gso_segment
);
2526 /* openvswitch calls this on rx path, so we need a different check.
2528 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2531 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2533 return skb
->ip_summed
== CHECKSUM_NONE
;
2537 * __skb_gso_segment - Perform segmentation on skb.
2538 * @skb: buffer to segment
2539 * @features: features for the output path (see dev->features)
2540 * @tx_path: whether it is called in TX path
2542 * This function segments the given skb and returns a list of segments.
2544 * It may return NULL if the skb requires no segmentation. This is
2545 * only possible when GSO is used for verifying header integrity.
2547 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2548 netdev_features_t features
, bool tx_path
)
2550 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2553 skb_warn_bad_offload(skb
);
2555 err
= skb_cow_head(skb
, 0);
2557 return ERR_PTR(err
);
2560 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2561 SKB_GSO_CB(skb
)->encap_level
= 0;
2563 skb_reset_mac_header(skb
);
2564 skb_reset_mac_len(skb
);
2566 return skb_mac_gso_segment(skb
, features
);
2568 EXPORT_SYMBOL(__skb_gso_segment
);
2570 /* Take action when hardware reception checksum errors are detected. */
2572 void netdev_rx_csum_fault(struct net_device
*dev
)
2574 if (net_ratelimit()) {
2575 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2579 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2582 /* Actually, we should eliminate this check as soon as we know, that:
2583 * 1. IOMMU is present and allows to map all the memory.
2584 * 2. No high memory really exists on this machine.
2587 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2589 #ifdef CONFIG_HIGHMEM
2591 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2592 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2593 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2594 if (PageHighMem(skb_frag_page(frag
)))
2599 if (PCI_DMA_BUS_IS_PHYS
) {
2600 struct device
*pdev
= dev
->dev
.parent
;
2604 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2605 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2606 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2607 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2615 /* If MPLS offload request, verify we are testing hardware MPLS features
2616 * instead of standard features for the netdev.
2618 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2619 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2620 netdev_features_t features
,
2623 if (eth_p_mpls(type
))
2624 features
&= skb
->dev
->mpls_features
;
2629 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2630 netdev_features_t features
,
2637 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2638 netdev_features_t features
)
2643 type
= skb_network_protocol(skb
, &tmp
);
2644 features
= net_mpls_features(skb
, features
, type
);
2646 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2647 !can_checksum_protocol(features
, type
)) {
2648 features
&= ~NETIF_F_ALL_CSUM
;
2649 } else if (illegal_highdma(skb
->dev
, skb
)) {
2650 features
&= ~NETIF_F_SG
;
2656 netdev_features_t
passthru_features_check(struct sk_buff
*skb
,
2657 struct net_device
*dev
,
2658 netdev_features_t features
)
2662 EXPORT_SYMBOL(passthru_features_check
);
2664 static netdev_features_t
dflt_features_check(const struct sk_buff
*skb
,
2665 struct net_device
*dev
,
2666 netdev_features_t features
)
2668 return vlan_features_check(skb
, features
);
2671 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2673 struct net_device
*dev
= skb
->dev
;
2674 netdev_features_t features
= dev
->features
;
2675 u16 gso_segs
= skb_shinfo(skb
)->gso_segs
;
2677 if (gso_segs
> dev
->gso_max_segs
|| gso_segs
< dev
->gso_min_segs
)
2678 features
&= ~NETIF_F_GSO_MASK
;
2680 /* If encapsulation offload request, verify we are testing
2681 * hardware encapsulation features instead of standard
2682 * features for the netdev
2684 if (skb
->encapsulation
)
2685 features
&= dev
->hw_enc_features
;
2687 if (skb_vlan_tagged(skb
))
2688 features
= netdev_intersect_features(features
,
2689 dev
->vlan_features
|
2690 NETIF_F_HW_VLAN_CTAG_TX
|
2691 NETIF_F_HW_VLAN_STAG_TX
);
2693 if (dev
->netdev_ops
->ndo_features_check
)
2694 features
&= dev
->netdev_ops
->ndo_features_check(skb
, dev
,
2697 features
&= dflt_features_check(skb
, dev
, features
);
2699 return harmonize_features(skb
, features
);
2701 EXPORT_SYMBOL(netif_skb_features
);
2703 static int xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
2704 struct netdev_queue
*txq
, bool more
)
2709 if (!list_empty(&ptype_all
) || !list_empty(&dev
->ptype_all
))
2710 dev_queue_xmit_nit(skb
, dev
);
2713 trace_net_dev_start_xmit(skb
, dev
);
2714 rc
= netdev_start_xmit(skb
, dev
, txq
, more
);
2715 trace_net_dev_xmit(skb
, rc
, dev
, len
);
2720 struct sk_buff
*dev_hard_start_xmit(struct sk_buff
*first
, struct net_device
*dev
,
2721 struct netdev_queue
*txq
, int *ret
)
2723 struct sk_buff
*skb
= first
;
2724 int rc
= NETDEV_TX_OK
;
2727 struct sk_buff
*next
= skb
->next
;
2730 rc
= xmit_one(skb
, dev
, txq
, next
!= NULL
);
2731 if (unlikely(!dev_xmit_complete(rc
))) {
2737 if (netif_xmit_stopped(txq
) && skb
) {
2738 rc
= NETDEV_TX_BUSY
;
2748 static struct sk_buff
*validate_xmit_vlan(struct sk_buff
*skb
,
2749 netdev_features_t features
)
2751 if (skb_vlan_tag_present(skb
) &&
2752 !vlan_hw_offload_capable(features
, skb
->vlan_proto
))
2753 skb
= __vlan_hwaccel_push_inside(skb
);
2757 static struct sk_buff
*validate_xmit_skb(struct sk_buff
*skb
, struct net_device
*dev
)
2759 netdev_features_t features
;
2764 features
= netif_skb_features(skb
);
2765 skb
= validate_xmit_vlan(skb
, features
);
2769 if (netif_needs_gso(skb
, features
)) {
2770 struct sk_buff
*segs
;
2772 segs
= skb_gso_segment(skb
, features
);
2780 if (skb_needs_linearize(skb
, features
) &&
2781 __skb_linearize(skb
))
2784 /* If packet is not checksummed and device does not
2785 * support checksumming for this protocol, complete
2786 * checksumming here.
2788 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2789 if (skb
->encapsulation
)
2790 skb_set_inner_transport_header(skb
,
2791 skb_checksum_start_offset(skb
));
2793 skb_set_transport_header(skb
,
2794 skb_checksum_start_offset(skb
));
2795 if (!(features
& NETIF_F_ALL_CSUM
) &&
2796 skb_checksum_help(skb
))
2809 struct sk_buff
*validate_xmit_skb_list(struct sk_buff
*skb
, struct net_device
*dev
)
2811 struct sk_buff
*next
, *head
= NULL
, *tail
;
2813 for (; skb
!= NULL
; skb
= next
) {
2817 /* in case skb wont be segmented, point to itself */
2820 skb
= validate_xmit_skb(skb
, dev
);
2828 /* If skb was segmented, skb->prev points to
2829 * the last segment. If not, it still contains skb.
2836 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2838 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2840 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2842 /* To get more precise estimation of bytes sent on wire,
2843 * we add to pkt_len the headers size of all segments
2845 if (shinfo
->gso_size
) {
2846 unsigned int hdr_len
;
2847 u16 gso_segs
= shinfo
->gso_segs
;
2849 /* mac layer + network layer */
2850 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2852 /* + transport layer */
2853 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2854 hdr_len
+= tcp_hdrlen(skb
);
2856 hdr_len
+= sizeof(struct udphdr
);
2858 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2859 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2862 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2866 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2867 struct net_device
*dev
,
2868 struct netdev_queue
*txq
)
2870 spinlock_t
*root_lock
= qdisc_lock(q
);
2874 qdisc_pkt_len_init(skb
);
2875 qdisc_calculate_pkt_len(skb
, q
);
2877 * Heuristic to force contended enqueues to serialize on a
2878 * separate lock before trying to get qdisc main lock.
2879 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2880 * often and dequeue packets faster.
2882 contended
= qdisc_is_running(q
);
2883 if (unlikely(contended
))
2884 spin_lock(&q
->busylock
);
2886 spin_lock(root_lock
);
2887 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2890 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2891 qdisc_run_begin(q
)) {
2893 * This is a work-conserving queue; there are no old skbs
2894 * waiting to be sent out; and the qdisc is not running -
2895 * xmit the skb directly.
2898 qdisc_bstats_update(q
, skb
);
2900 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
, true)) {
2901 if (unlikely(contended
)) {
2902 spin_unlock(&q
->busylock
);
2909 rc
= NET_XMIT_SUCCESS
;
2911 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2912 if (qdisc_run_begin(q
)) {
2913 if (unlikely(contended
)) {
2914 spin_unlock(&q
->busylock
);
2920 spin_unlock(root_lock
);
2921 if (unlikely(contended
))
2922 spin_unlock(&q
->busylock
);
2926 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2927 static void skb_update_prio(struct sk_buff
*skb
)
2929 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2931 if (!skb
->priority
&& skb
->sk
&& map
) {
2932 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2934 if (prioidx
< map
->priomap_len
)
2935 skb
->priority
= map
->priomap
[prioidx
];
2939 #define skb_update_prio(skb)
2942 DEFINE_PER_CPU(int, xmit_recursion
);
2943 EXPORT_SYMBOL(xmit_recursion
);
2945 #define RECURSION_LIMIT 10
2948 * dev_loopback_xmit - loop back @skb
2949 * @net: network namespace this loopback is happening in
2950 * @sk: sk needed to be a netfilter okfn
2951 * @skb: buffer to transmit
2953 int dev_loopback_xmit(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
2955 skb_reset_mac_header(skb
);
2956 __skb_pull(skb
, skb_network_offset(skb
));
2957 skb
->pkt_type
= PACKET_LOOPBACK
;
2958 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2959 WARN_ON(!skb_dst(skb
));
2964 EXPORT_SYMBOL(dev_loopback_xmit
);
2966 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
2969 struct xps_dev_maps
*dev_maps
;
2970 struct xps_map
*map
;
2971 int queue_index
= -1;
2974 dev_maps
= rcu_dereference(dev
->xps_maps
);
2976 map
= rcu_dereference(
2977 dev_maps
->cpu_map
[skb
->sender_cpu
- 1]);
2980 queue_index
= map
->queues
[0];
2982 queue_index
= map
->queues
[reciprocal_scale(skb_get_hash(skb
),
2984 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
2996 static u16
__netdev_pick_tx(struct net_device
*dev
, struct sk_buff
*skb
)
2998 struct sock
*sk
= skb
->sk
;
2999 int queue_index
= sk_tx_queue_get(sk
);
3001 if (queue_index
< 0 || skb
->ooo_okay
||
3002 queue_index
>= dev
->real_num_tx_queues
) {
3003 int new_index
= get_xps_queue(dev
, skb
);
3005 new_index
= skb_tx_hash(dev
, skb
);
3007 if (queue_index
!= new_index
&& sk
&&
3009 rcu_access_pointer(sk
->sk_dst_cache
))
3010 sk_tx_queue_set(sk
, new_index
);
3012 queue_index
= new_index
;
3018 struct netdev_queue
*netdev_pick_tx(struct net_device
*dev
,
3019 struct sk_buff
*skb
,
3022 int queue_index
= 0;
3025 u32 sender_cpu
= skb
->sender_cpu
- 1;
3027 if (sender_cpu
>= (u32
)NR_CPUS
)
3028 skb
->sender_cpu
= raw_smp_processor_id() + 1;
3031 if (dev
->real_num_tx_queues
!= 1) {
3032 const struct net_device_ops
*ops
= dev
->netdev_ops
;
3033 if (ops
->ndo_select_queue
)
3034 queue_index
= ops
->ndo_select_queue(dev
, skb
, accel_priv
,
3037 queue_index
= __netdev_pick_tx(dev
, skb
);
3040 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
3043 skb_set_queue_mapping(skb
, queue_index
);
3044 return netdev_get_tx_queue(dev
, queue_index
);
3048 * __dev_queue_xmit - transmit a buffer
3049 * @skb: buffer to transmit
3050 * @accel_priv: private data used for L2 forwarding offload
3052 * Queue a buffer for transmission to a network device. The caller must
3053 * have set the device and priority and built the buffer before calling
3054 * this function. The function can be called from an interrupt.
3056 * A negative errno code is returned on a failure. A success does not
3057 * guarantee the frame will be transmitted as it may be dropped due
3058 * to congestion or traffic shaping.
3060 * -----------------------------------------------------------------------------------
3061 * I notice this method can also return errors from the queue disciplines,
3062 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3065 * Regardless of the return value, the skb is consumed, so it is currently
3066 * difficult to retry a send to this method. (You can bump the ref count
3067 * before sending to hold a reference for retry if you are careful.)
3069 * When calling this method, interrupts MUST be enabled. This is because
3070 * the BH enable code must have IRQs enabled so that it will not deadlock.
3073 static int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
3075 struct net_device
*dev
= skb
->dev
;
3076 struct netdev_queue
*txq
;
3080 skb_reset_mac_header(skb
);
3082 if (unlikely(skb_shinfo(skb
)->tx_flags
& SKBTX_SCHED_TSTAMP
))
3083 __skb_tstamp_tx(skb
, NULL
, skb
->sk
, SCM_TSTAMP_SCHED
);
3085 /* Disable soft irqs for various locks below. Also
3086 * stops preemption for RCU.
3090 skb_update_prio(skb
);
3092 /* If device/qdisc don't need skb->dst, release it right now while
3093 * its hot in this cpu cache.
3095 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
3100 #ifdef CONFIG_NET_SWITCHDEV
3101 /* Don't forward if offload device already forwarded */
3102 if (skb
->offload_fwd_mark
&&
3103 skb
->offload_fwd_mark
== dev
->offload_fwd_mark
) {
3105 rc
= NET_XMIT_SUCCESS
;
3110 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
3111 q
= rcu_dereference_bh(txq
->qdisc
);
3113 #ifdef CONFIG_NET_CLS_ACT
3114 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
3116 trace_net_dev_queue(skb
);
3118 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
3122 /* The device has no queue. Common case for software devices:
3123 loopback, all the sorts of tunnels...
3125 Really, it is unlikely that netif_tx_lock protection is necessary
3126 here. (f.e. loopback and IP tunnels are clean ignoring statistics
3128 However, it is possible, that they rely on protection
3131 Check this and shot the lock. It is not prone from deadlocks.
3132 Either shot noqueue qdisc, it is even simpler 8)
3134 if (dev
->flags
& IFF_UP
) {
3135 int cpu
= smp_processor_id(); /* ok because BHs are off */
3137 if (txq
->xmit_lock_owner
!= cpu
) {
3139 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
3140 goto recursion_alert
;
3142 skb
= validate_xmit_skb(skb
, dev
);
3146 HARD_TX_LOCK(dev
, txq
, cpu
);
3148 if (!netif_xmit_stopped(txq
)) {
3149 __this_cpu_inc(xmit_recursion
);
3150 skb
= dev_hard_start_xmit(skb
, dev
, txq
, &rc
);
3151 __this_cpu_dec(xmit_recursion
);
3152 if (dev_xmit_complete(rc
)) {
3153 HARD_TX_UNLOCK(dev
, txq
);
3157 HARD_TX_UNLOCK(dev
, txq
);
3158 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3161 /* Recursion is detected! It is possible,
3165 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3172 rcu_read_unlock_bh();
3174 atomic_long_inc(&dev
->tx_dropped
);
3175 kfree_skb_list(skb
);
3178 rcu_read_unlock_bh();
3182 int dev_queue_xmit(struct sk_buff
*skb
)
3184 return __dev_queue_xmit(skb
, NULL
);
3186 EXPORT_SYMBOL(dev_queue_xmit
);
3188 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
3190 return __dev_queue_xmit(skb
, accel_priv
);
3192 EXPORT_SYMBOL(dev_queue_xmit_accel
);
3195 /*=======================================================================
3197 =======================================================================*/
3199 int netdev_max_backlog __read_mostly
= 1000;
3200 EXPORT_SYMBOL(netdev_max_backlog
);
3202 int netdev_tstamp_prequeue __read_mostly
= 1;
3203 int netdev_budget __read_mostly
= 300;
3204 int weight_p __read_mostly
= 64; /* old backlog weight */
3206 /* Called with irq disabled */
3207 static inline void ____napi_schedule(struct softnet_data
*sd
,
3208 struct napi_struct
*napi
)
3210 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
3211 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3216 /* One global table that all flow-based protocols share. */
3217 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
3218 EXPORT_SYMBOL(rps_sock_flow_table
);
3219 u32 rps_cpu_mask __read_mostly
;
3220 EXPORT_SYMBOL(rps_cpu_mask
);
3222 struct static_key rps_needed __read_mostly
;
3224 static struct rps_dev_flow
*
3225 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3226 struct rps_dev_flow
*rflow
, u16 next_cpu
)
3228 if (next_cpu
< nr_cpu_ids
) {
3229 #ifdef CONFIG_RFS_ACCEL
3230 struct netdev_rx_queue
*rxqueue
;
3231 struct rps_dev_flow_table
*flow_table
;
3232 struct rps_dev_flow
*old_rflow
;
3237 /* Should we steer this flow to a different hardware queue? */
3238 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
3239 !(dev
->features
& NETIF_F_NTUPLE
))
3241 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
3242 if (rxq_index
== skb_get_rx_queue(skb
))
3245 rxqueue
= dev
->_rx
+ rxq_index
;
3246 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3249 flow_id
= skb_get_hash(skb
) & flow_table
->mask
;
3250 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
3251 rxq_index
, flow_id
);
3255 rflow
= &flow_table
->flows
[flow_id
];
3257 if (old_rflow
->filter
== rflow
->filter
)
3258 old_rflow
->filter
= RPS_NO_FILTER
;
3262 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
3265 rflow
->cpu
= next_cpu
;
3270 * get_rps_cpu is called from netif_receive_skb and returns the target
3271 * CPU from the RPS map of the receiving queue for a given skb.
3272 * rcu_read_lock must be held on entry.
3274 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3275 struct rps_dev_flow
**rflowp
)
3277 const struct rps_sock_flow_table
*sock_flow_table
;
3278 struct netdev_rx_queue
*rxqueue
= dev
->_rx
;
3279 struct rps_dev_flow_table
*flow_table
;
3280 struct rps_map
*map
;
3285 if (skb_rx_queue_recorded(skb
)) {
3286 u16 index
= skb_get_rx_queue(skb
);
3288 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
3289 WARN_ONCE(dev
->real_num_rx_queues
> 1,
3290 "%s received packet on queue %u, but number "
3291 "of RX queues is %u\n",
3292 dev
->name
, index
, dev
->real_num_rx_queues
);
3298 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3300 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3301 map
= rcu_dereference(rxqueue
->rps_map
);
3302 if (!flow_table
&& !map
)
3305 skb_reset_network_header(skb
);
3306 hash
= skb_get_hash(skb
);
3310 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3311 if (flow_table
&& sock_flow_table
) {
3312 struct rps_dev_flow
*rflow
;
3316 /* First check into global flow table if there is a match */
3317 ident
= sock_flow_table
->ents
[hash
& sock_flow_table
->mask
];
3318 if ((ident
^ hash
) & ~rps_cpu_mask
)
3321 next_cpu
= ident
& rps_cpu_mask
;
3323 /* OK, now we know there is a match,
3324 * we can look at the local (per receive queue) flow table
3326 rflow
= &flow_table
->flows
[hash
& flow_table
->mask
];
3330 * If the desired CPU (where last recvmsg was done) is
3331 * different from current CPU (one in the rx-queue flow
3332 * table entry), switch if one of the following holds:
3333 * - Current CPU is unset (>= nr_cpu_ids).
3334 * - Current CPU is offline.
3335 * - The current CPU's queue tail has advanced beyond the
3336 * last packet that was enqueued using this table entry.
3337 * This guarantees that all previous packets for the flow
3338 * have been dequeued, thus preserving in order delivery.
3340 if (unlikely(tcpu
!= next_cpu
) &&
3341 (tcpu
>= nr_cpu_ids
|| !cpu_online(tcpu
) ||
3342 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3343 rflow
->last_qtail
)) >= 0)) {
3345 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3348 if (tcpu
< nr_cpu_ids
&& cpu_online(tcpu
)) {
3358 tcpu
= map
->cpus
[reciprocal_scale(hash
, map
->len
)];
3359 if (cpu_online(tcpu
)) {
3369 #ifdef CONFIG_RFS_ACCEL
3372 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3373 * @dev: Device on which the filter was set
3374 * @rxq_index: RX queue index
3375 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3376 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3378 * Drivers that implement ndo_rx_flow_steer() should periodically call
3379 * this function for each installed filter and remove the filters for
3380 * which it returns %true.
3382 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3383 u32 flow_id
, u16 filter_id
)
3385 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3386 struct rps_dev_flow_table
*flow_table
;
3387 struct rps_dev_flow
*rflow
;
3392 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3393 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3394 rflow
= &flow_table
->flows
[flow_id
];
3395 cpu
= ACCESS_ONCE(rflow
->cpu
);
3396 if (rflow
->filter
== filter_id
&& cpu
< nr_cpu_ids
&&
3397 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3398 rflow
->last_qtail
) <
3399 (int)(10 * flow_table
->mask
)))
3405 EXPORT_SYMBOL(rps_may_expire_flow
);
3407 #endif /* CONFIG_RFS_ACCEL */
3409 /* Called from hardirq (IPI) context */
3410 static void rps_trigger_softirq(void *data
)
3412 struct softnet_data
*sd
= data
;
3414 ____napi_schedule(sd
, &sd
->backlog
);
3418 #endif /* CONFIG_RPS */
3421 * Check if this softnet_data structure is another cpu one
3422 * If yes, queue it to our IPI list and return 1
3425 static int rps_ipi_queued(struct softnet_data
*sd
)
3428 struct softnet_data
*mysd
= this_cpu_ptr(&softnet_data
);
3431 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3432 mysd
->rps_ipi_list
= sd
;
3434 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3437 #endif /* CONFIG_RPS */
3441 #ifdef CONFIG_NET_FLOW_LIMIT
3442 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3445 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3447 #ifdef CONFIG_NET_FLOW_LIMIT
3448 struct sd_flow_limit
*fl
;
3449 struct softnet_data
*sd
;
3450 unsigned int old_flow
, new_flow
;
3452 if (qlen
< (netdev_max_backlog
>> 1))
3455 sd
= this_cpu_ptr(&softnet_data
);
3458 fl
= rcu_dereference(sd
->flow_limit
);
3460 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3461 old_flow
= fl
->history
[fl
->history_head
];
3462 fl
->history
[fl
->history_head
] = new_flow
;
3465 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3467 if (likely(fl
->buckets
[old_flow
]))
3468 fl
->buckets
[old_flow
]--;
3470 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3482 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3483 * queue (may be a remote CPU queue).
3485 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3486 unsigned int *qtail
)
3488 struct softnet_data
*sd
;
3489 unsigned long flags
;
3492 sd
= &per_cpu(softnet_data
, cpu
);
3494 local_irq_save(flags
);
3497 if (!netif_running(skb
->dev
))
3499 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3500 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3503 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3504 input_queue_tail_incr_save(sd
, qtail
);
3506 local_irq_restore(flags
);
3507 return NET_RX_SUCCESS
;
3510 /* Schedule NAPI for backlog device
3511 * We can use non atomic operation since we own the queue lock
3513 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3514 if (!rps_ipi_queued(sd
))
3515 ____napi_schedule(sd
, &sd
->backlog
);
3524 local_irq_restore(flags
);
3526 atomic_long_inc(&skb
->dev
->rx_dropped
);
3531 static int netif_rx_internal(struct sk_buff
*skb
)
3535 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3537 trace_netif_rx(skb
);
3539 if (static_key_false(&rps_needed
)) {
3540 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3546 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3548 cpu
= smp_processor_id();
3550 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3558 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3565 * netif_rx - post buffer to the network code
3566 * @skb: buffer to post
3568 * This function receives a packet from a device driver and queues it for
3569 * the upper (protocol) levels to process. It always succeeds. The buffer
3570 * may be dropped during processing for congestion control or by the
3574 * NET_RX_SUCCESS (no congestion)
3575 * NET_RX_DROP (packet was dropped)
3579 int netif_rx(struct sk_buff
*skb
)
3581 trace_netif_rx_entry(skb
);
3583 return netif_rx_internal(skb
);
3585 EXPORT_SYMBOL(netif_rx
);
3587 int netif_rx_ni(struct sk_buff
*skb
)
3591 trace_netif_rx_ni_entry(skb
);
3594 err
= netif_rx_internal(skb
);
3595 if (local_softirq_pending())
3601 EXPORT_SYMBOL(netif_rx_ni
);
3603 static void net_tx_action(struct softirq_action
*h
)
3605 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
3607 if (sd
->completion_queue
) {
3608 struct sk_buff
*clist
;
3610 local_irq_disable();
3611 clist
= sd
->completion_queue
;
3612 sd
->completion_queue
= NULL
;
3616 struct sk_buff
*skb
= clist
;
3617 clist
= clist
->next
;
3619 WARN_ON(atomic_read(&skb
->users
));
3620 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
3621 trace_consume_skb(skb
);
3623 trace_kfree_skb(skb
, net_tx_action
);
3628 if (sd
->output_queue
) {
3631 local_irq_disable();
3632 head
= sd
->output_queue
;
3633 sd
->output_queue
= NULL
;
3634 sd
->output_queue_tailp
= &sd
->output_queue
;
3638 struct Qdisc
*q
= head
;
3639 spinlock_t
*root_lock
;
3641 head
= head
->next_sched
;
3643 root_lock
= qdisc_lock(q
);
3644 if (spin_trylock(root_lock
)) {
3645 smp_mb__before_atomic();
3646 clear_bit(__QDISC_STATE_SCHED
,
3649 spin_unlock(root_lock
);
3651 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3653 __netif_reschedule(q
);
3655 smp_mb__before_atomic();
3656 clear_bit(__QDISC_STATE_SCHED
,
3664 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3665 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3666 /* This hook is defined here for ATM LANE */
3667 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3668 unsigned char *addr
) __read_mostly
;
3669 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3672 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3673 struct packet_type
**pt_prev
,
3674 int *ret
, struct net_device
*orig_dev
)
3676 #ifdef CONFIG_NET_CLS_ACT
3677 struct tcf_proto
*cl
= rcu_dereference_bh(skb
->dev
->ingress_cl_list
);
3678 struct tcf_result cl_res
;
3680 /* If there's at least one ingress present somewhere (so
3681 * we get here via enabled static key), remaining devices
3682 * that are not configured with an ingress qdisc will bail
3688 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3692 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
3693 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3694 qdisc_bstats_cpu_update(cl
->q
, skb
);
3696 switch (tc_classify(skb
, cl
, &cl_res
, false)) {
3698 case TC_ACT_RECLASSIFY
:
3699 skb
->tc_index
= TC_H_MIN(cl_res
.classid
);
3702 qdisc_qstats_cpu_drop(cl
->q
);
3707 case TC_ACT_REDIRECT
:
3708 /* skb_mac_header check was done by cls/act_bpf, so
3709 * we can safely push the L2 header back before
3710 * redirecting to another netdev
3712 __skb_push(skb
, skb
->mac_len
);
3713 skb_do_redirect(skb
);
3718 #endif /* CONFIG_NET_CLS_ACT */
3723 * netdev_rx_handler_register - register receive handler
3724 * @dev: device to register a handler for
3725 * @rx_handler: receive handler to register
3726 * @rx_handler_data: data pointer that is used by rx handler
3728 * Register a receive handler for a device. This handler will then be
3729 * called from __netif_receive_skb. A negative errno code is returned
3732 * The caller must hold the rtnl_mutex.
3734 * For a general description of rx_handler, see enum rx_handler_result.
3736 int netdev_rx_handler_register(struct net_device
*dev
,
3737 rx_handler_func_t
*rx_handler
,
3738 void *rx_handler_data
)
3742 if (dev
->rx_handler
)
3745 /* Note: rx_handler_data must be set before rx_handler */
3746 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3747 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3751 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3754 * netdev_rx_handler_unregister - unregister receive handler
3755 * @dev: device to unregister a handler from
3757 * Unregister a receive handler from a device.
3759 * The caller must hold the rtnl_mutex.
3761 void netdev_rx_handler_unregister(struct net_device
*dev
)
3765 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3766 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3767 * section has a guarantee to see a non NULL rx_handler_data
3771 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3773 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3776 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3777 * the special handling of PFMEMALLOC skbs.
3779 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3781 switch (skb
->protocol
) {
3782 case htons(ETH_P_ARP
):
3783 case htons(ETH_P_IP
):
3784 case htons(ETH_P_IPV6
):
3785 case htons(ETH_P_8021Q
):
3786 case htons(ETH_P_8021AD
):
3793 static inline int nf_ingress(struct sk_buff
*skb
, struct packet_type
**pt_prev
,
3794 int *ret
, struct net_device
*orig_dev
)
3796 #ifdef CONFIG_NETFILTER_INGRESS
3797 if (nf_hook_ingress_active(skb
)) {
3799 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3803 return nf_hook_ingress(skb
);
3805 #endif /* CONFIG_NETFILTER_INGRESS */
3809 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3811 struct packet_type
*ptype
, *pt_prev
;
3812 rx_handler_func_t
*rx_handler
;
3813 struct net_device
*orig_dev
;
3814 bool deliver_exact
= false;
3815 int ret
= NET_RX_DROP
;
3818 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3820 trace_netif_receive_skb(skb
);
3822 orig_dev
= skb
->dev
;
3824 skb_reset_network_header(skb
);
3825 if (!skb_transport_header_was_set(skb
))
3826 skb_reset_transport_header(skb
);
3827 skb_reset_mac_len(skb
);
3832 skb
->skb_iif
= skb
->dev
->ifindex
;
3834 __this_cpu_inc(softnet_data
.processed
);
3836 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
3837 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
3838 skb
= skb_vlan_untag(skb
);
3843 #ifdef CONFIG_NET_CLS_ACT
3844 if (skb
->tc_verd
& TC_NCLS
) {
3845 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3853 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3855 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3859 list_for_each_entry_rcu(ptype
, &skb
->dev
->ptype_all
, list
) {
3861 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3866 #ifdef CONFIG_NET_INGRESS
3867 if (static_key_false(&ingress_needed
)) {
3868 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3872 if (nf_ingress(skb
, &pt_prev
, &ret
, orig_dev
) < 0)
3876 #ifdef CONFIG_NET_CLS_ACT
3880 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3883 if (skb_vlan_tag_present(skb
)) {
3885 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3888 if (vlan_do_receive(&skb
))
3890 else if (unlikely(!skb
))
3894 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3897 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3900 switch (rx_handler(&skb
)) {
3901 case RX_HANDLER_CONSUMED
:
3902 ret
= NET_RX_SUCCESS
;
3904 case RX_HANDLER_ANOTHER
:
3906 case RX_HANDLER_EXACT
:
3907 deliver_exact
= true;
3908 case RX_HANDLER_PASS
:
3915 if (unlikely(skb_vlan_tag_present(skb
))) {
3916 if (skb_vlan_tag_get_id(skb
))
3917 skb
->pkt_type
= PACKET_OTHERHOST
;
3918 /* Note: we might in the future use prio bits
3919 * and set skb->priority like in vlan_do_receive()
3920 * For the time being, just ignore Priority Code Point
3925 type
= skb
->protocol
;
3927 /* deliver only exact match when indicated */
3928 if (likely(!deliver_exact
)) {
3929 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3930 &ptype_base
[ntohs(type
) &
3934 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3935 &orig_dev
->ptype_specific
);
3937 if (unlikely(skb
->dev
!= orig_dev
)) {
3938 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3939 &skb
->dev
->ptype_specific
);
3943 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3946 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3949 atomic_long_inc(&skb
->dev
->rx_dropped
);
3951 /* Jamal, now you will not able to escape explaining
3952 * me how you were going to use this. :-)
3961 static int __netif_receive_skb(struct sk_buff
*skb
)
3965 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3966 unsigned long pflags
= current
->flags
;
3969 * PFMEMALLOC skbs are special, they should
3970 * - be delivered to SOCK_MEMALLOC sockets only
3971 * - stay away from userspace
3972 * - have bounded memory usage
3974 * Use PF_MEMALLOC as this saves us from propagating the allocation
3975 * context down to all allocation sites.
3977 current
->flags
|= PF_MEMALLOC
;
3978 ret
= __netif_receive_skb_core(skb
, true);
3979 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3981 ret
= __netif_receive_skb_core(skb
, false);
3986 static int netif_receive_skb_internal(struct sk_buff
*skb
)
3990 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3992 if (skb_defer_rx_timestamp(skb
))
3993 return NET_RX_SUCCESS
;
3998 if (static_key_false(&rps_needed
)) {
3999 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
4000 int cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
4003 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
4009 ret
= __netif_receive_skb(skb
);
4015 * netif_receive_skb - process receive buffer from network
4016 * @skb: buffer to process
4018 * netif_receive_skb() is the main receive data processing function.
4019 * It always succeeds. The buffer may be dropped during processing
4020 * for congestion control or by the protocol layers.
4022 * This function may only be called from softirq context and interrupts
4023 * should be enabled.
4025 * Return values (usually ignored):
4026 * NET_RX_SUCCESS: no congestion
4027 * NET_RX_DROP: packet was dropped
4029 int netif_receive_skb(struct sk_buff
*skb
)
4031 trace_netif_receive_skb_entry(skb
);
4033 return netif_receive_skb_internal(skb
);
4035 EXPORT_SYMBOL(netif_receive_skb
);
4037 /* Network device is going away, flush any packets still pending
4038 * Called with irqs disabled.
4040 static void flush_backlog(void *arg
)
4042 struct net_device
*dev
= arg
;
4043 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4044 struct sk_buff
*skb
, *tmp
;
4047 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
4048 if (skb
->dev
== dev
) {
4049 __skb_unlink(skb
, &sd
->input_pkt_queue
);
4051 input_queue_head_incr(sd
);
4056 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
4057 if (skb
->dev
== dev
) {
4058 __skb_unlink(skb
, &sd
->process_queue
);
4060 input_queue_head_incr(sd
);
4065 static int napi_gro_complete(struct sk_buff
*skb
)
4067 struct packet_offload
*ptype
;
4068 __be16 type
= skb
->protocol
;
4069 struct list_head
*head
= &offload_base
;
4072 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
4074 if (NAPI_GRO_CB(skb
)->count
== 1) {
4075 skb_shinfo(skb
)->gso_size
= 0;
4080 list_for_each_entry_rcu(ptype
, head
, list
) {
4081 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4084 err
= ptype
->callbacks
.gro_complete(skb
, 0);
4090 WARN_ON(&ptype
->list
== head
);
4092 return NET_RX_SUCCESS
;
4096 return netif_receive_skb_internal(skb
);
4099 /* napi->gro_list contains packets ordered by age.
4100 * youngest packets at the head of it.
4101 * Complete skbs in reverse order to reduce latencies.
4103 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
4105 struct sk_buff
*skb
, *prev
= NULL
;
4107 /* scan list and build reverse chain */
4108 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
4113 for (skb
= prev
; skb
; skb
= prev
) {
4116 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
4120 napi_gro_complete(skb
);
4124 napi
->gro_list
= NULL
;
4126 EXPORT_SYMBOL(napi_gro_flush
);
4128 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
4131 unsigned int maclen
= skb
->dev
->hard_header_len
;
4132 u32 hash
= skb_get_hash_raw(skb
);
4134 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
4135 unsigned long diffs
;
4137 NAPI_GRO_CB(p
)->flush
= 0;
4139 if (hash
!= skb_get_hash_raw(p
)) {
4140 NAPI_GRO_CB(p
)->same_flow
= 0;
4144 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
4145 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
4146 if (maclen
== ETH_HLEN
)
4147 diffs
|= compare_ether_header(skb_mac_header(p
),
4148 skb_mac_header(skb
));
4150 diffs
= memcmp(skb_mac_header(p
),
4151 skb_mac_header(skb
),
4153 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
4157 static void skb_gro_reset_offset(struct sk_buff
*skb
)
4159 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4160 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
4162 NAPI_GRO_CB(skb
)->data_offset
= 0;
4163 NAPI_GRO_CB(skb
)->frag0
= NULL
;
4164 NAPI_GRO_CB(skb
)->frag0_len
= 0;
4166 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
4168 !PageHighMem(skb_frag_page(frag0
))) {
4169 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
4170 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
4174 static void gro_pull_from_frag0(struct sk_buff
*skb
, int grow
)
4176 struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4178 BUG_ON(skb
->end
- skb
->tail
< grow
);
4180 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
4182 skb
->data_len
-= grow
;
4185 pinfo
->frags
[0].page_offset
+= grow
;
4186 skb_frag_size_sub(&pinfo
->frags
[0], grow
);
4188 if (unlikely(!skb_frag_size(&pinfo
->frags
[0]))) {
4189 skb_frag_unref(skb
, 0);
4190 memmove(pinfo
->frags
, pinfo
->frags
+ 1,
4191 --pinfo
->nr_frags
* sizeof(pinfo
->frags
[0]));
4195 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4197 struct sk_buff
**pp
= NULL
;
4198 struct packet_offload
*ptype
;
4199 __be16 type
= skb
->protocol
;
4200 struct list_head
*head
= &offload_base
;
4202 enum gro_result ret
;
4205 if (!(skb
->dev
->features
& NETIF_F_GRO
))
4208 if (skb_is_gso(skb
) || skb_has_frag_list(skb
) || skb
->csum_bad
)
4211 gro_list_prepare(napi
, skb
);
4214 list_for_each_entry_rcu(ptype
, head
, list
) {
4215 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4218 skb_set_network_header(skb
, skb_gro_offset(skb
));
4219 skb_reset_mac_len(skb
);
4220 NAPI_GRO_CB(skb
)->same_flow
= 0;
4221 NAPI_GRO_CB(skb
)->flush
= 0;
4222 NAPI_GRO_CB(skb
)->free
= 0;
4223 NAPI_GRO_CB(skb
)->udp_mark
= 0;
4224 NAPI_GRO_CB(skb
)->gro_remcsum_start
= 0;
4226 /* Setup for GRO checksum validation */
4227 switch (skb
->ip_summed
) {
4228 case CHECKSUM_COMPLETE
:
4229 NAPI_GRO_CB(skb
)->csum
= skb
->csum
;
4230 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4231 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4233 case CHECKSUM_UNNECESSARY
:
4234 NAPI_GRO_CB(skb
)->csum_cnt
= skb
->csum_level
+ 1;
4235 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4238 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4239 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4242 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
4247 if (&ptype
->list
== head
)
4250 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
4251 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
4254 struct sk_buff
*nskb
= *pp
;
4258 napi_gro_complete(nskb
);
4265 if (NAPI_GRO_CB(skb
)->flush
)
4268 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
4269 struct sk_buff
*nskb
= napi
->gro_list
;
4271 /* locate the end of the list to select the 'oldest' flow */
4272 while (nskb
->next
) {
4278 napi_gro_complete(nskb
);
4282 NAPI_GRO_CB(skb
)->count
= 1;
4283 NAPI_GRO_CB(skb
)->age
= jiffies
;
4284 NAPI_GRO_CB(skb
)->last
= skb
;
4285 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
4286 skb
->next
= napi
->gro_list
;
4287 napi
->gro_list
= skb
;
4291 grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
4293 gro_pull_from_frag0(skb
, grow
);
4302 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
4304 struct list_head
*offload_head
= &offload_base
;
4305 struct packet_offload
*ptype
;
4307 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4308 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4314 EXPORT_SYMBOL(gro_find_receive_by_type
);
4316 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
4318 struct list_head
*offload_head
= &offload_base
;
4319 struct packet_offload
*ptype
;
4321 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4322 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4328 EXPORT_SYMBOL(gro_find_complete_by_type
);
4330 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
4334 if (netif_receive_skb_internal(skb
))
4342 case GRO_MERGED_FREE
:
4343 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
4344 kmem_cache_free(skbuff_head_cache
, skb
);
4357 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4359 skb_mark_napi_id(skb
, napi
);
4360 trace_napi_gro_receive_entry(skb
);
4362 skb_gro_reset_offset(skb
);
4364 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4366 EXPORT_SYMBOL(napi_gro_receive
);
4368 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4370 if (unlikely(skb
->pfmemalloc
)) {
4374 __skb_pull(skb
, skb_headlen(skb
));
4375 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4376 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
4378 skb
->dev
= napi
->dev
;
4380 skb
->encapsulation
= 0;
4381 skb_shinfo(skb
)->gso_type
= 0;
4382 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
4387 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
4389 struct sk_buff
*skb
= napi
->skb
;
4392 skb
= napi_alloc_skb(napi
, GRO_MAX_HEAD
);
4394 skb_mark_napi_id(skb
, napi
);
4398 EXPORT_SYMBOL(napi_get_frags
);
4400 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
4401 struct sk_buff
*skb
,
4407 __skb_push(skb
, ETH_HLEN
);
4408 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4409 if (ret
== GRO_NORMAL
&& netif_receive_skb_internal(skb
))
4414 case GRO_MERGED_FREE
:
4415 napi_reuse_skb(napi
, skb
);
4425 /* Upper GRO stack assumes network header starts at gro_offset=0
4426 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4427 * We copy ethernet header into skb->data to have a common layout.
4429 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4431 struct sk_buff
*skb
= napi
->skb
;
4432 const struct ethhdr
*eth
;
4433 unsigned int hlen
= sizeof(*eth
);
4437 skb_reset_mac_header(skb
);
4438 skb_gro_reset_offset(skb
);
4440 eth
= skb_gro_header_fast(skb
, 0);
4441 if (unlikely(skb_gro_header_hard(skb
, hlen
))) {
4442 eth
= skb_gro_header_slow(skb
, hlen
, 0);
4443 if (unlikely(!eth
)) {
4444 napi_reuse_skb(napi
, skb
);
4448 gro_pull_from_frag0(skb
, hlen
);
4449 NAPI_GRO_CB(skb
)->frag0
+= hlen
;
4450 NAPI_GRO_CB(skb
)->frag0_len
-= hlen
;
4452 __skb_pull(skb
, hlen
);
4455 * This works because the only protocols we care about don't require
4457 * We'll fix it up properly in napi_frags_finish()
4459 skb
->protocol
= eth
->h_proto
;
4464 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4466 struct sk_buff
*skb
= napi_frags_skb(napi
);
4471 trace_napi_gro_frags_entry(skb
);
4473 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4475 EXPORT_SYMBOL(napi_gro_frags
);
4477 /* Compute the checksum from gro_offset and return the folded value
4478 * after adding in any pseudo checksum.
4480 __sum16
__skb_gro_checksum_complete(struct sk_buff
*skb
)
4485 wsum
= skb_checksum(skb
, skb_gro_offset(skb
), skb_gro_len(skb
), 0);
4487 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4488 sum
= csum_fold(csum_add(NAPI_GRO_CB(skb
)->csum
, wsum
));
4490 if (unlikely(skb
->ip_summed
== CHECKSUM_COMPLETE
) &&
4491 !skb
->csum_complete_sw
)
4492 netdev_rx_csum_fault(skb
->dev
);
4495 NAPI_GRO_CB(skb
)->csum
= wsum
;
4496 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4500 EXPORT_SYMBOL(__skb_gro_checksum_complete
);
4503 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4504 * Note: called with local irq disabled, but exits with local irq enabled.
4506 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4509 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4512 sd
->rps_ipi_list
= NULL
;
4516 /* Send pending IPI's to kick RPS processing on remote cpus. */
4518 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4520 if (cpu_online(remsd
->cpu
))
4521 smp_call_function_single_async(remsd
->cpu
,
4530 static bool sd_has_rps_ipi_waiting(struct softnet_data
*sd
)
4533 return sd
->rps_ipi_list
!= NULL
;
4539 static int process_backlog(struct napi_struct
*napi
, int quota
)
4542 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4544 /* Check if we have pending ipi, its better to send them now,
4545 * not waiting net_rx_action() end.
4547 if (sd_has_rps_ipi_waiting(sd
)) {
4548 local_irq_disable();
4549 net_rps_action_and_irq_enable(sd
);
4552 napi
->weight
= weight_p
;
4553 local_irq_disable();
4555 struct sk_buff
*skb
;
4557 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4560 __netif_receive_skb(skb
);
4562 local_irq_disable();
4563 input_queue_head_incr(sd
);
4564 if (++work
>= quota
) {
4571 if (skb_queue_empty(&sd
->input_pkt_queue
)) {
4573 * Inline a custom version of __napi_complete().
4574 * only current cpu owns and manipulates this napi,
4575 * and NAPI_STATE_SCHED is the only possible flag set
4577 * We can use a plain write instead of clear_bit(),
4578 * and we dont need an smp_mb() memory barrier.
4586 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4587 &sd
->process_queue
);
4596 * __napi_schedule - schedule for receive
4597 * @n: entry to schedule
4599 * The entry's receive function will be scheduled to run.
4600 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4602 void __napi_schedule(struct napi_struct
*n
)
4604 unsigned long flags
;
4606 local_irq_save(flags
);
4607 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4608 local_irq_restore(flags
);
4610 EXPORT_SYMBOL(__napi_schedule
);
4613 * __napi_schedule_irqoff - schedule for receive
4614 * @n: entry to schedule
4616 * Variant of __napi_schedule() assuming hard irqs are masked
4618 void __napi_schedule_irqoff(struct napi_struct
*n
)
4620 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4622 EXPORT_SYMBOL(__napi_schedule_irqoff
);
4624 void __napi_complete(struct napi_struct
*n
)
4626 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4628 list_del_init(&n
->poll_list
);
4629 smp_mb__before_atomic();
4630 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4632 EXPORT_SYMBOL(__napi_complete
);
4634 void napi_complete_done(struct napi_struct
*n
, int work_done
)
4636 unsigned long flags
;
4639 * don't let napi dequeue from the cpu poll list
4640 * just in case its running on a different cpu
4642 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4646 unsigned long timeout
= 0;
4649 timeout
= n
->dev
->gro_flush_timeout
;
4652 hrtimer_start(&n
->timer
, ns_to_ktime(timeout
),
4653 HRTIMER_MODE_REL_PINNED
);
4655 napi_gro_flush(n
, false);
4657 if (likely(list_empty(&n
->poll_list
))) {
4658 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED
, &n
->state
));
4660 /* If n->poll_list is not empty, we need to mask irqs */
4661 local_irq_save(flags
);
4663 local_irq_restore(flags
);
4666 EXPORT_SYMBOL(napi_complete_done
);
4668 /* must be called under rcu_read_lock(), as we dont take a reference */
4669 static struct napi_struct
*napi_by_id(unsigned int napi_id
)
4671 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4672 struct napi_struct
*napi
;
4674 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4675 if (napi
->napi_id
== napi_id
)
4681 #if defined(CONFIG_NET_RX_BUSY_POLL)
4682 #define BUSY_POLL_BUDGET 8
4683 bool sk_busy_loop(struct sock
*sk
, int nonblock
)
4685 unsigned long end_time
= !nonblock
? sk_busy_loop_end_time(sk
) : 0;
4686 int (*busy_poll
)(struct napi_struct
*dev
);
4687 struct napi_struct
*napi
;
4692 napi
= napi_by_id(sk
->sk_napi_id
);
4696 /* Note: ndo_busy_poll method is optional in linux-4.5 */
4697 busy_poll
= napi
->dev
->netdev_ops
->ndo_busy_poll
;
4703 rc
= busy_poll(napi
);
4704 } else if (napi_schedule_prep(napi
)) {
4705 void *have
= netpoll_poll_lock(napi
);
4707 if (test_bit(NAPI_STATE_SCHED
, &napi
->state
)) {
4708 rc
= napi
->poll(napi
, BUSY_POLL_BUDGET
);
4709 trace_napi_poll(napi
);
4710 if (rc
== BUSY_POLL_BUDGET
) {
4711 napi_complete_done(napi
, rc
);
4712 napi_schedule(napi
);
4715 netpoll_poll_unlock(have
);
4718 NET_ADD_STATS_BH(sock_net(sk
),
4719 LINUX_MIB_BUSYPOLLRXPACKETS
, rc
);
4722 if (rc
== LL_FLUSH_FAILED
)
4723 break; /* permanent failure */
4726 } while (!nonblock
&& skb_queue_empty(&sk
->sk_receive_queue
) &&
4727 !need_resched() && !busy_loop_timeout(end_time
));
4729 rc
= !skb_queue_empty(&sk
->sk_receive_queue
);
4734 EXPORT_SYMBOL(sk_busy_loop
);
4736 #endif /* CONFIG_NET_RX_BUSY_POLL */
4738 void napi_hash_add(struct napi_struct
*napi
)
4740 if (test_bit(NAPI_STATE_NO_BUSY_POLL
, &napi
->state
) ||
4741 test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
))
4744 spin_lock(&napi_hash_lock
);
4746 /* 0..NR_CPUS+1 range is reserved for sender_cpu use */
4748 if (unlikely(++napi_gen_id
< NR_CPUS
+ 1))
4749 napi_gen_id
= NR_CPUS
+ 1;
4750 } while (napi_by_id(napi_gen_id
));
4751 napi
->napi_id
= napi_gen_id
;
4753 hlist_add_head_rcu(&napi
->napi_hash_node
,
4754 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
4756 spin_unlock(&napi_hash_lock
);
4758 EXPORT_SYMBOL_GPL(napi_hash_add
);
4760 /* Warning : caller is responsible to make sure rcu grace period
4761 * is respected before freeing memory containing @napi
4763 bool napi_hash_del(struct napi_struct
*napi
)
4765 bool rcu_sync_needed
= false;
4767 spin_lock(&napi_hash_lock
);
4769 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
4770 rcu_sync_needed
= true;
4771 hlist_del_rcu(&napi
->napi_hash_node
);
4773 spin_unlock(&napi_hash_lock
);
4774 return rcu_sync_needed
;
4776 EXPORT_SYMBOL_GPL(napi_hash_del
);
4778 static enum hrtimer_restart
napi_watchdog(struct hrtimer
*timer
)
4780 struct napi_struct
*napi
;
4782 napi
= container_of(timer
, struct napi_struct
, timer
);
4784 napi_schedule(napi
);
4786 return HRTIMER_NORESTART
;
4789 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4790 int (*poll
)(struct napi_struct
*, int), int weight
)
4792 INIT_LIST_HEAD(&napi
->poll_list
);
4793 hrtimer_init(&napi
->timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_REL_PINNED
);
4794 napi
->timer
.function
= napi_watchdog
;
4795 napi
->gro_count
= 0;
4796 napi
->gro_list
= NULL
;
4799 if (weight
> NAPI_POLL_WEIGHT
)
4800 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4802 napi
->weight
= weight
;
4803 list_add(&napi
->dev_list
, &dev
->napi_list
);
4805 #ifdef CONFIG_NETPOLL
4806 spin_lock_init(&napi
->poll_lock
);
4807 napi
->poll_owner
= -1;
4809 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4810 napi_hash_add(napi
);
4812 EXPORT_SYMBOL(netif_napi_add
);
4814 void napi_disable(struct napi_struct
*n
)
4817 set_bit(NAPI_STATE_DISABLE
, &n
->state
);
4819 while (test_and_set_bit(NAPI_STATE_SCHED
, &n
->state
))
4821 while (test_and_set_bit(NAPI_STATE_NPSVC
, &n
->state
))
4824 hrtimer_cancel(&n
->timer
);
4826 clear_bit(NAPI_STATE_DISABLE
, &n
->state
);
4828 EXPORT_SYMBOL(napi_disable
);
4830 /* Must be called in process context */
4831 void netif_napi_del(struct napi_struct
*napi
)
4834 if (napi_hash_del(napi
))
4836 list_del_init(&napi
->dev_list
);
4837 napi_free_frags(napi
);
4839 kfree_skb_list(napi
->gro_list
);
4840 napi
->gro_list
= NULL
;
4841 napi
->gro_count
= 0;
4843 EXPORT_SYMBOL(netif_napi_del
);
4845 static int napi_poll(struct napi_struct
*n
, struct list_head
*repoll
)
4850 list_del_init(&n
->poll_list
);
4852 have
= netpoll_poll_lock(n
);
4856 /* This NAPI_STATE_SCHED test is for avoiding a race
4857 * with netpoll's poll_napi(). Only the entity which
4858 * obtains the lock and sees NAPI_STATE_SCHED set will
4859 * actually make the ->poll() call. Therefore we avoid
4860 * accidentally calling ->poll() when NAPI is not scheduled.
4863 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4864 work
= n
->poll(n
, weight
);
4868 WARN_ON_ONCE(work
> weight
);
4870 if (likely(work
< weight
))
4873 /* Drivers must not modify the NAPI state if they
4874 * consume the entire weight. In such cases this code
4875 * still "owns" the NAPI instance and therefore can
4876 * move the instance around on the list at-will.
4878 if (unlikely(napi_disable_pending(n
))) {
4884 /* flush too old packets
4885 * If HZ < 1000, flush all packets.
4887 napi_gro_flush(n
, HZ
>= 1000);
4890 /* Some drivers may have called napi_schedule
4891 * prior to exhausting their budget.
4893 if (unlikely(!list_empty(&n
->poll_list
))) {
4894 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
4895 n
->dev
? n
->dev
->name
: "backlog");
4899 list_add_tail(&n
->poll_list
, repoll
);
4902 netpoll_poll_unlock(have
);
4907 static void net_rx_action(struct softirq_action
*h
)
4909 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4910 unsigned long time_limit
= jiffies
+ 2;
4911 int budget
= netdev_budget
;
4915 local_irq_disable();
4916 list_splice_init(&sd
->poll_list
, &list
);
4920 struct napi_struct
*n
;
4922 if (list_empty(&list
)) {
4923 if (!sd_has_rps_ipi_waiting(sd
) && list_empty(&repoll
))
4928 n
= list_first_entry(&list
, struct napi_struct
, poll_list
);
4929 budget
-= napi_poll(n
, &repoll
);
4931 /* If softirq window is exhausted then punt.
4932 * Allow this to run for 2 jiffies since which will allow
4933 * an average latency of 1.5/HZ.
4935 if (unlikely(budget
<= 0 ||
4936 time_after_eq(jiffies
, time_limit
))) {
4942 local_irq_disable();
4944 list_splice_tail_init(&sd
->poll_list
, &list
);
4945 list_splice_tail(&repoll
, &list
);
4946 list_splice(&list
, &sd
->poll_list
);
4947 if (!list_empty(&sd
->poll_list
))
4948 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4950 net_rps_action_and_irq_enable(sd
);
4953 struct netdev_adjacent
{
4954 struct net_device
*dev
;
4956 /* upper master flag, there can only be one master device per list */
4959 /* counter for the number of times this device was added to us */
4962 /* private field for the users */
4965 struct list_head list
;
4966 struct rcu_head rcu
;
4969 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*adj_dev
,
4970 struct list_head
*adj_list
)
4972 struct netdev_adjacent
*adj
;
4974 list_for_each_entry(adj
, adj_list
, list
) {
4975 if (adj
->dev
== adj_dev
)
4982 * netdev_has_upper_dev - Check if device is linked to an upper device
4984 * @upper_dev: upper device to check
4986 * Find out if a device is linked to specified upper device and return true
4987 * in case it is. Note that this checks only immediate upper device,
4988 * not through a complete stack of devices. The caller must hold the RTNL lock.
4990 bool netdev_has_upper_dev(struct net_device
*dev
,
4991 struct net_device
*upper_dev
)
4995 return __netdev_find_adj(upper_dev
, &dev
->all_adj_list
.upper
);
4997 EXPORT_SYMBOL(netdev_has_upper_dev
);
5000 * netdev_has_any_upper_dev - Check if device is linked to some device
5003 * Find out if a device is linked to an upper device and return true in case
5004 * it is. The caller must hold the RTNL lock.
5006 static bool netdev_has_any_upper_dev(struct net_device
*dev
)
5010 return !list_empty(&dev
->all_adj_list
.upper
);
5014 * netdev_master_upper_dev_get - Get master upper device
5017 * Find a master upper device and return pointer to it or NULL in case
5018 * it's not there. The caller must hold the RTNL lock.
5020 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
5022 struct netdev_adjacent
*upper
;
5026 if (list_empty(&dev
->adj_list
.upper
))
5029 upper
= list_first_entry(&dev
->adj_list
.upper
,
5030 struct netdev_adjacent
, list
);
5031 if (likely(upper
->master
))
5035 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
5037 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
5039 struct netdev_adjacent
*adj
;
5041 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
5043 return adj
->private;
5045 EXPORT_SYMBOL(netdev_adjacent_get_private
);
5048 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
5050 * @iter: list_head ** of the current position
5052 * Gets the next device from the dev's upper list, starting from iter
5053 * position. The caller must hold RCU read lock.
5055 struct net_device
*netdev_upper_get_next_dev_rcu(struct net_device
*dev
,
5056 struct list_head
**iter
)
5058 struct netdev_adjacent
*upper
;
5060 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5062 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5064 if (&upper
->list
== &dev
->adj_list
.upper
)
5067 *iter
= &upper
->list
;
5071 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu
);
5074 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
5076 * @iter: list_head ** of the current position
5078 * Gets the next device from the dev's upper list, starting from iter
5079 * position. The caller must hold RCU read lock.
5081 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
5082 struct list_head
**iter
)
5084 struct netdev_adjacent
*upper
;
5086 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5088 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5090 if (&upper
->list
== &dev
->all_adj_list
.upper
)
5093 *iter
= &upper
->list
;
5097 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
5100 * netdev_lower_get_next_private - Get the next ->private from the
5101 * lower neighbour list
5103 * @iter: list_head ** of the current position
5105 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5106 * list, starting from iter position. The caller must hold either hold the
5107 * RTNL lock or its own locking that guarantees that the neighbour lower
5108 * list will remain unchanged.
5110 void *netdev_lower_get_next_private(struct net_device
*dev
,
5111 struct list_head
**iter
)
5113 struct netdev_adjacent
*lower
;
5115 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
5117 if (&lower
->list
== &dev
->adj_list
.lower
)
5120 *iter
= lower
->list
.next
;
5122 return lower
->private;
5124 EXPORT_SYMBOL(netdev_lower_get_next_private
);
5127 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5128 * lower neighbour list, RCU
5131 * @iter: list_head ** of the current position
5133 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5134 * list, starting from iter position. The caller must hold RCU read lock.
5136 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
5137 struct list_head
**iter
)
5139 struct netdev_adjacent
*lower
;
5141 WARN_ON_ONCE(!rcu_read_lock_held());
5143 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5145 if (&lower
->list
== &dev
->adj_list
.lower
)
5148 *iter
= &lower
->list
;
5150 return lower
->private;
5152 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
5155 * netdev_lower_get_next - Get the next device from the lower neighbour
5158 * @iter: list_head ** of the current position
5160 * Gets the next netdev_adjacent from the dev's lower neighbour
5161 * list, starting from iter position. The caller must hold RTNL lock or
5162 * its own locking that guarantees that the neighbour lower
5163 * list will remain unchanged.
5165 void *netdev_lower_get_next(struct net_device
*dev
, struct list_head
**iter
)
5167 struct netdev_adjacent
*lower
;
5169 lower
= list_entry((*iter
)->next
, struct netdev_adjacent
, list
);
5171 if (&lower
->list
== &dev
->adj_list
.lower
)
5174 *iter
= &lower
->list
;
5178 EXPORT_SYMBOL(netdev_lower_get_next
);
5181 * netdev_lower_get_first_private_rcu - Get the first ->private from the
5182 * lower neighbour list, RCU
5186 * Gets the first netdev_adjacent->private from the dev's lower neighbour
5187 * list. The caller must hold RCU read lock.
5189 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
5191 struct netdev_adjacent
*lower
;
5193 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
5194 struct netdev_adjacent
, list
);
5196 return lower
->private;
5199 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
5202 * netdev_master_upper_dev_get_rcu - Get master upper device
5205 * Find a master upper device and return pointer to it or NULL in case
5206 * it's not there. The caller must hold the RCU read lock.
5208 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
5210 struct netdev_adjacent
*upper
;
5212 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
5213 struct netdev_adjacent
, list
);
5214 if (upper
&& likely(upper
->master
))
5218 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
5220 static int netdev_adjacent_sysfs_add(struct net_device
*dev
,
5221 struct net_device
*adj_dev
,
5222 struct list_head
*dev_list
)
5224 char linkname
[IFNAMSIZ
+7];
5225 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
5226 "upper_%s" : "lower_%s", adj_dev
->name
);
5227 return sysfs_create_link(&(dev
->dev
.kobj
), &(adj_dev
->dev
.kobj
),
5230 static void netdev_adjacent_sysfs_del(struct net_device
*dev
,
5232 struct list_head
*dev_list
)
5234 char linkname
[IFNAMSIZ
+7];
5235 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
5236 "upper_%s" : "lower_%s", name
);
5237 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
5240 static inline bool netdev_adjacent_is_neigh_list(struct net_device
*dev
,
5241 struct net_device
*adj_dev
,
5242 struct list_head
*dev_list
)
5244 return (dev_list
== &dev
->adj_list
.upper
||
5245 dev_list
== &dev
->adj_list
.lower
) &&
5246 net_eq(dev_net(dev
), dev_net(adj_dev
));
5249 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
5250 struct net_device
*adj_dev
,
5251 struct list_head
*dev_list
,
5252 void *private, bool master
)
5254 struct netdev_adjacent
*adj
;
5257 adj
= __netdev_find_adj(adj_dev
, dev_list
);
5264 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
5269 adj
->master
= master
;
5271 adj
->private = private;
5274 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5275 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5277 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
)) {
5278 ret
= netdev_adjacent_sysfs_add(dev
, adj_dev
, dev_list
);
5283 /* Ensure that master link is always the first item in list. */
5285 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
5286 &(adj_dev
->dev
.kobj
), "master");
5288 goto remove_symlinks
;
5290 list_add_rcu(&adj
->list
, dev_list
);
5292 list_add_tail_rcu(&adj
->list
, dev_list
);
5298 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5299 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5307 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
5308 struct net_device
*adj_dev
,
5309 struct list_head
*dev_list
)
5311 struct netdev_adjacent
*adj
;
5313 adj
= __netdev_find_adj(adj_dev
, dev_list
);
5316 pr_err("tried to remove device %s from %s\n",
5317 dev
->name
, adj_dev
->name
);
5321 if (adj
->ref_nr
> 1) {
5322 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
5329 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
5331 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5332 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5334 list_del_rcu(&adj
->list
);
5335 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5336 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5338 kfree_rcu(adj
, rcu
);
5341 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
5342 struct net_device
*upper_dev
,
5343 struct list_head
*up_list
,
5344 struct list_head
*down_list
,
5345 void *private, bool master
)
5349 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
5354 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
5357 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5364 static int __netdev_adjacent_dev_link(struct net_device
*dev
,
5365 struct net_device
*upper_dev
)
5367 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5368 &dev
->all_adj_list
.upper
,
5369 &upper_dev
->all_adj_list
.lower
,
5373 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
5374 struct net_device
*upper_dev
,
5375 struct list_head
*up_list
,
5376 struct list_head
*down_list
)
5378 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5379 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
5382 static void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
5383 struct net_device
*upper_dev
)
5385 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5386 &dev
->all_adj_list
.upper
,
5387 &upper_dev
->all_adj_list
.lower
);
5390 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
5391 struct net_device
*upper_dev
,
5392 void *private, bool master
)
5394 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
5399 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5400 &dev
->adj_list
.upper
,
5401 &upper_dev
->adj_list
.lower
,
5404 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5411 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
5412 struct net_device
*upper_dev
)
5414 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5415 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5416 &dev
->adj_list
.upper
,
5417 &upper_dev
->adj_list
.lower
);
5420 static int __netdev_upper_dev_link(struct net_device
*dev
,
5421 struct net_device
*upper_dev
, bool master
,
5424 struct netdev_notifier_changeupper_info changeupper_info
;
5425 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
5430 if (dev
== upper_dev
)
5433 /* To prevent loops, check if dev is not upper device to upper_dev. */
5434 if (__netdev_find_adj(dev
, &upper_dev
->all_adj_list
.upper
))
5437 if (__netdev_find_adj(upper_dev
, &dev
->adj_list
.upper
))
5440 if (master
&& netdev_master_upper_dev_get(dev
))
5443 changeupper_info
.upper_dev
= upper_dev
;
5444 changeupper_info
.master
= master
;
5445 changeupper_info
.linking
= true;
5447 ret
= call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER
, dev
,
5448 &changeupper_info
.info
);
5449 ret
= notifier_to_errno(ret
);
5453 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, private,
5458 /* Now that we linked these devs, make all the upper_dev's
5459 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5460 * versa, and don't forget the devices itself. All of these
5461 * links are non-neighbours.
5463 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5464 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5465 pr_debug("Interlinking %s with %s, non-neighbour\n",
5466 i
->dev
->name
, j
->dev
->name
);
5467 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
5473 /* add dev to every upper_dev's upper device */
5474 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5475 pr_debug("linking %s's upper device %s with %s\n",
5476 upper_dev
->name
, i
->dev
->name
, dev
->name
);
5477 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
5479 goto rollback_upper_mesh
;
5482 /* add upper_dev to every dev's lower device */
5483 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5484 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
5485 i
->dev
->name
, upper_dev
->name
);
5486 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
5488 goto rollback_lower_mesh
;
5491 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
, dev
,
5492 &changeupper_info
.info
);
5495 rollback_lower_mesh
:
5497 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5500 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5505 rollback_upper_mesh
:
5507 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5510 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5518 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5519 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5520 if (i
== to_i
&& j
== to_j
)
5522 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5528 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5534 * netdev_upper_dev_link - Add a link to the upper device
5536 * @upper_dev: new upper device
5538 * Adds a link to device which is upper to this one. The caller must hold
5539 * the RTNL lock. On a failure a negative errno code is returned.
5540 * On success the reference counts are adjusted and the function
5543 int netdev_upper_dev_link(struct net_device
*dev
,
5544 struct net_device
*upper_dev
)
5546 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
);
5548 EXPORT_SYMBOL(netdev_upper_dev_link
);
5551 * netdev_master_upper_dev_link - Add a master link to the upper device
5553 * @upper_dev: new upper device
5555 * Adds a link to device which is upper to this one. In this case, only
5556 * one master upper device can be linked, although other non-master devices
5557 * might be linked as well. The caller must hold the RTNL lock.
5558 * On a failure a negative errno code is returned. On success the reference
5559 * counts are adjusted and the function returns zero.
5561 int netdev_master_upper_dev_link(struct net_device
*dev
,
5562 struct net_device
*upper_dev
)
5564 return __netdev_upper_dev_link(dev
, upper_dev
, true, NULL
);
5566 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
5568 int netdev_master_upper_dev_link_private(struct net_device
*dev
,
5569 struct net_device
*upper_dev
,
5572 return __netdev_upper_dev_link(dev
, upper_dev
, true, private);
5574 EXPORT_SYMBOL(netdev_master_upper_dev_link_private
);
5577 * netdev_upper_dev_unlink - Removes a link to upper device
5579 * @upper_dev: new upper device
5581 * Removes a link to device which is upper to this one. The caller must hold
5584 void netdev_upper_dev_unlink(struct net_device
*dev
,
5585 struct net_device
*upper_dev
)
5587 struct netdev_notifier_changeupper_info changeupper_info
;
5588 struct netdev_adjacent
*i
, *j
;
5591 changeupper_info
.upper_dev
= upper_dev
;
5592 changeupper_info
.master
= netdev_master_upper_dev_get(dev
) == upper_dev
;
5593 changeupper_info
.linking
= false;
5595 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER
, dev
,
5596 &changeupper_info
.info
);
5598 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5600 /* Here is the tricky part. We must remove all dev's lower
5601 * devices from all upper_dev's upper devices and vice
5602 * versa, to maintain the graph relationship.
5604 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5605 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
5606 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5608 /* remove also the devices itself from lower/upper device
5611 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5612 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5614 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
5615 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5617 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
, dev
,
5618 &changeupper_info
.info
);
5620 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
5623 * netdev_bonding_info_change - Dispatch event about slave change
5625 * @bonding_info: info to dispatch
5627 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5628 * The caller must hold the RTNL lock.
5630 void netdev_bonding_info_change(struct net_device
*dev
,
5631 struct netdev_bonding_info
*bonding_info
)
5633 struct netdev_notifier_bonding_info info
;
5635 memcpy(&info
.bonding_info
, bonding_info
,
5636 sizeof(struct netdev_bonding_info
));
5637 call_netdevice_notifiers_info(NETDEV_BONDING_INFO
, dev
,
5640 EXPORT_SYMBOL(netdev_bonding_info_change
);
5642 static void netdev_adjacent_add_links(struct net_device
*dev
)
5644 struct netdev_adjacent
*iter
;
5646 struct net
*net
= dev_net(dev
);
5648 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5649 if (!net_eq(net
,dev_net(iter
->dev
)))
5651 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5652 &iter
->dev
->adj_list
.lower
);
5653 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5654 &dev
->adj_list
.upper
);
5657 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5658 if (!net_eq(net
,dev_net(iter
->dev
)))
5660 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5661 &iter
->dev
->adj_list
.upper
);
5662 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5663 &dev
->adj_list
.lower
);
5667 static void netdev_adjacent_del_links(struct net_device
*dev
)
5669 struct netdev_adjacent
*iter
;
5671 struct net
*net
= dev_net(dev
);
5673 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5674 if (!net_eq(net
,dev_net(iter
->dev
)))
5676 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5677 &iter
->dev
->adj_list
.lower
);
5678 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5679 &dev
->adj_list
.upper
);
5682 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5683 if (!net_eq(net
,dev_net(iter
->dev
)))
5685 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5686 &iter
->dev
->adj_list
.upper
);
5687 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5688 &dev
->adj_list
.lower
);
5692 void netdev_adjacent_rename_links(struct net_device
*dev
, char *oldname
)
5694 struct netdev_adjacent
*iter
;
5696 struct net
*net
= dev_net(dev
);
5698 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5699 if (!net_eq(net
,dev_net(iter
->dev
)))
5701 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5702 &iter
->dev
->adj_list
.lower
);
5703 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5704 &iter
->dev
->adj_list
.lower
);
5707 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5708 if (!net_eq(net
,dev_net(iter
->dev
)))
5710 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5711 &iter
->dev
->adj_list
.upper
);
5712 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5713 &iter
->dev
->adj_list
.upper
);
5717 void *netdev_lower_dev_get_private(struct net_device
*dev
,
5718 struct net_device
*lower_dev
)
5720 struct netdev_adjacent
*lower
;
5724 lower
= __netdev_find_adj(lower_dev
, &dev
->adj_list
.lower
);
5728 return lower
->private;
5730 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
5733 int dev_get_nest_level(struct net_device
*dev
,
5734 bool (*type_check
)(struct net_device
*dev
))
5736 struct net_device
*lower
= NULL
;
5737 struct list_head
*iter
;
5743 netdev_for_each_lower_dev(dev
, lower
, iter
) {
5744 nest
= dev_get_nest_level(lower
, type_check
);
5745 if (max_nest
< nest
)
5749 if (type_check(dev
))
5754 EXPORT_SYMBOL(dev_get_nest_level
);
5756 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
5758 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5760 if (ops
->ndo_change_rx_flags
)
5761 ops
->ndo_change_rx_flags(dev
, flags
);
5764 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
5766 unsigned int old_flags
= dev
->flags
;
5772 dev
->flags
|= IFF_PROMISC
;
5773 dev
->promiscuity
+= inc
;
5774 if (dev
->promiscuity
== 0) {
5777 * If inc causes overflow, untouch promisc and return error.
5780 dev
->flags
&= ~IFF_PROMISC
;
5782 dev
->promiscuity
-= inc
;
5783 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5788 if (dev
->flags
!= old_flags
) {
5789 pr_info("device %s %s promiscuous mode\n",
5791 dev
->flags
& IFF_PROMISC
? "entered" : "left");
5792 if (audit_enabled
) {
5793 current_uid_gid(&uid
, &gid
);
5794 audit_log(current
->audit_context
, GFP_ATOMIC
,
5795 AUDIT_ANOM_PROMISCUOUS
,
5796 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5797 dev
->name
, (dev
->flags
& IFF_PROMISC
),
5798 (old_flags
& IFF_PROMISC
),
5799 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
5800 from_kuid(&init_user_ns
, uid
),
5801 from_kgid(&init_user_ns
, gid
),
5802 audit_get_sessionid(current
));
5805 dev_change_rx_flags(dev
, IFF_PROMISC
);
5808 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
5813 * dev_set_promiscuity - update promiscuity count on a device
5817 * Add or remove promiscuity from a device. While the count in the device
5818 * remains above zero the interface remains promiscuous. Once it hits zero
5819 * the device reverts back to normal filtering operation. A negative inc
5820 * value is used to drop promiscuity on the device.
5821 * Return 0 if successful or a negative errno code on error.
5823 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
5825 unsigned int old_flags
= dev
->flags
;
5828 err
= __dev_set_promiscuity(dev
, inc
, true);
5831 if (dev
->flags
!= old_flags
)
5832 dev_set_rx_mode(dev
);
5835 EXPORT_SYMBOL(dev_set_promiscuity
);
5837 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
5839 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5843 dev
->flags
|= IFF_ALLMULTI
;
5844 dev
->allmulti
+= inc
;
5845 if (dev
->allmulti
== 0) {
5848 * If inc causes overflow, untouch allmulti and return error.
5851 dev
->flags
&= ~IFF_ALLMULTI
;
5853 dev
->allmulti
-= inc
;
5854 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5859 if (dev
->flags
^ old_flags
) {
5860 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
5861 dev_set_rx_mode(dev
);
5863 __dev_notify_flags(dev
, old_flags
,
5864 dev
->gflags
^ old_gflags
);
5870 * dev_set_allmulti - update allmulti count on a device
5874 * Add or remove reception of all multicast frames to a device. While the
5875 * count in the device remains above zero the interface remains listening
5876 * to all interfaces. Once it hits zero the device reverts back to normal
5877 * filtering operation. A negative @inc value is used to drop the counter
5878 * when releasing a resource needing all multicasts.
5879 * Return 0 if successful or a negative errno code on error.
5882 int dev_set_allmulti(struct net_device
*dev
, int inc
)
5884 return __dev_set_allmulti(dev
, inc
, true);
5886 EXPORT_SYMBOL(dev_set_allmulti
);
5889 * Upload unicast and multicast address lists to device and
5890 * configure RX filtering. When the device doesn't support unicast
5891 * filtering it is put in promiscuous mode while unicast addresses
5894 void __dev_set_rx_mode(struct net_device
*dev
)
5896 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5898 /* dev_open will call this function so the list will stay sane. */
5899 if (!(dev
->flags
&IFF_UP
))
5902 if (!netif_device_present(dev
))
5905 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
5906 /* Unicast addresses changes may only happen under the rtnl,
5907 * therefore calling __dev_set_promiscuity here is safe.
5909 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
5910 __dev_set_promiscuity(dev
, 1, false);
5911 dev
->uc_promisc
= true;
5912 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
5913 __dev_set_promiscuity(dev
, -1, false);
5914 dev
->uc_promisc
= false;
5918 if (ops
->ndo_set_rx_mode
)
5919 ops
->ndo_set_rx_mode(dev
);
5922 void dev_set_rx_mode(struct net_device
*dev
)
5924 netif_addr_lock_bh(dev
);
5925 __dev_set_rx_mode(dev
);
5926 netif_addr_unlock_bh(dev
);
5930 * dev_get_flags - get flags reported to userspace
5933 * Get the combination of flag bits exported through APIs to userspace.
5935 unsigned int dev_get_flags(const struct net_device
*dev
)
5939 flags
= (dev
->flags
& ~(IFF_PROMISC
|
5944 (dev
->gflags
& (IFF_PROMISC
|
5947 if (netif_running(dev
)) {
5948 if (netif_oper_up(dev
))
5949 flags
|= IFF_RUNNING
;
5950 if (netif_carrier_ok(dev
))
5951 flags
|= IFF_LOWER_UP
;
5952 if (netif_dormant(dev
))
5953 flags
|= IFF_DORMANT
;
5958 EXPORT_SYMBOL(dev_get_flags
);
5960 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5962 unsigned int old_flags
= dev
->flags
;
5968 * Set the flags on our device.
5971 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
5972 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
5974 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
5978 * Load in the correct multicast list now the flags have changed.
5981 if ((old_flags
^ flags
) & IFF_MULTICAST
)
5982 dev_change_rx_flags(dev
, IFF_MULTICAST
);
5984 dev_set_rx_mode(dev
);
5987 * Have we downed the interface. We handle IFF_UP ourselves
5988 * according to user attempts to set it, rather than blindly
5993 if ((old_flags
^ flags
) & IFF_UP
)
5994 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
5996 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
5997 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
5998 unsigned int old_flags
= dev
->flags
;
6000 dev
->gflags
^= IFF_PROMISC
;
6002 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
6003 if (dev
->flags
!= old_flags
)
6004 dev_set_rx_mode(dev
);
6007 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
6008 is important. Some (broken) drivers set IFF_PROMISC, when
6009 IFF_ALLMULTI is requested not asking us and not reporting.
6011 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
6012 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
6014 dev
->gflags
^= IFF_ALLMULTI
;
6015 __dev_set_allmulti(dev
, inc
, false);
6021 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
6022 unsigned int gchanges
)
6024 unsigned int changes
= dev
->flags
^ old_flags
;
6027 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
6029 if (changes
& IFF_UP
) {
6030 if (dev
->flags
& IFF_UP
)
6031 call_netdevice_notifiers(NETDEV_UP
, dev
);
6033 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
6036 if (dev
->flags
& IFF_UP
&&
6037 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
6038 struct netdev_notifier_change_info change_info
;
6040 change_info
.flags_changed
= changes
;
6041 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
6047 * dev_change_flags - change device settings
6049 * @flags: device state flags
6051 * Change settings on device based state flags. The flags are
6052 * in the userspace exported format.
6054 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
6057 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
6059 ret
= __dev_change_flags(dev
, flags
);
6063 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
6064 __dev_notify_flags(dev
, old_flags
, changes
);
6067 EXPORT_SYMBOL(dev_change_flags
);
6069 static int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
6071 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6073 if (ops
->ndo_change_mtu
)
6074 return ops
->ndo_change_mtu(dev
, new_mtu
);
6081 * dev_set_mtu - Change maximum transfer unit
6083 * @new_mtu: new transfer unit
6085 * Change the maximum transfer size of the network device.
6087 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
6091 if (new_mtu
== dev
->mtu
)
6094 /* MTU must be positive. */
6098 if (!netif_device_present(dev
))
6101 err
= call_netdevice_notifiers(NETDEV_PRECHANGEMTU
, dev
);
6102 err
= notifier_to_errno(err
);
6106 orig_mtu
= dev
->mtu
;
6107 err
= __dev_set_mtu(dev
, new_mtu
);
6110 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6111 err
= notifier_to_errno(err
);
6113 /* setting mtu back and notifying everyone again,
6114 * so that they have a chance to revert changes.
6116 __dev_set_mtu(dev
, orig_mtu
);
6117 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6122 EXPORT_SYMBOL(dev_set_mtu
);
6125 * dev_set_group - Change group this device belongs to
6127 * @new_group: group this device should belong to
6129 void dev_set_group(struct net_device
*dev
, int new_group
)
6131 dev
->group
= new_group
;
6133 EXPORT_SYMBOL(dev_set_group
);
6136 * dev_set_mac_address - Change Media Access Control Address
6140 * Change the hardware (MAC) address of the device
6142 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
6144 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6147 if (!ops
->ndo_set_mac_address
)
6149 if (sa
->sa_family
!= dev
->type
)
6151 if (!netif_device_present(dev
))
6153 err
= ops
->ndo_set_mac_address(dev
, sa
);
6156 dev
->addr_assign_type
= NET_ADDR_SET
;
6157 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
6158 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6161 EXPORT_SYMBOL(dev_set_mac_address
);
6164 * dev_change_carrier - Change device carrier
6166 * @new_carrier: new value
6168 * Change device carrier
6170 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
6172 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6174 if (!ops
->ndo_change_carrier
)
6176 if (!netif_device_present(dev
))
6178 return ops
->ndo_change_carrier(dev
, new_carrier
);
6180 EXPORT_SYMBOL(dev_change_carrier
);
6183 * dev_get_phys_port_id - Get device physical port ID
6187 * Get device physical port ID
6189 int dev_get_phys_port_id(struct net_device
*dev
,
6190 struct netdev_phys_item_id
*ppid
)
6192 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6194 if (!ops
->ndo_get_phys_port_id
)
6196 return ops
->ndo_get_phys_port_id(dev
, ppid
);
6198 EXPORT_SYMBOL(dev_get_phys_port_id
);
6201 * dev_get_phys_port_name - Get device physical port name
6205 * Get device physical port name
6207 int dev_get_phys_port_name(struct net_device
*dev
,
6208 char *name
, size_t len
)
6210 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6212 if (!ops
->ndo_get_phys_port_name
)
6214 return ops
->ndo_get_phys_port_name(dev
, name
, len
);
6216 EXPORT_SYMBOL(dev_get_phys_port_name
);
6219 * dev_change_proto_down - update protocol port state information
6221 * @proto_down: new value
6223 * This info can be used by switch drivers to set the phys state of the
6226 int dev_change_proto_down(struct net_device
*dev
, bool proto_down
)
6228 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6230 if (!ops
->ndo_change_proto_down
)
6232 if (!netif_device_present(dev
))
6234 return ops
->ndo_change_proto_down(dev
, proto_down
);
6236 EXPORT_SYMBOL(dev_change_proto_down
);
6239 * dev_new_index - allocate an ifindex
6240 * @net: the applicable net namespace
6242 * Returns a suitable unique value for a new device interface
6243 * number. The caller must hold the rtnl semaphore or the
6244 * dev_base_lock to be sure it remains unique.
6246 static int dev_new_index(struct net
*net
)
6248 int ifindex
= net
->ifindex
;
6252 if (!__dev_get_by_index(net
, ifindex
))
6253 return net
->ifindex
= ifindex
;
6257 /* Delayed registration/unregisteration */
6258 static LIST_HEAD(net_todo_list
);
6259 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
6261 static void net_set_todo(struct net_device
*dev
)
6263 list_add_tail(&dev
->todo_list
, &net_todo_list
);
6264 dev_net(dev
)->dev_unreg_count
++;
6267 static void rollback_registered_many(struct list_head
*head
)
6269 struct net_device
*dev
, *tmp
;
6270 LIST_HEAD(close_head
);
6272 BUG_ON(dev_boot_phase
);
6275 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
6276 /* Some devices call without registering
6277 * for initialization unwind. Remove those
6278 * devices and proceed with the remaining.
6280 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6281 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6285 list_del(&dev
->unreg_list
);
6288 dev
->dismantle
= true;
6289 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
6292 /* If device is running, close it first. */
6293 list_for_each_entry(dev
, head
, unreg_list
)
6294 list_add_tail(&dev
->close_list
, &close_head
);
6295 dev_close_many(&close_head
, true);
6297 list_for_each_entry(dev
, head
, unreg_list
) {
6298 /* And unlink it from device chain. */
6299 unlist_netdevice(dev
);
6301 dev
->reg_state
= NETREG_UNREGISTERING
;
6302 on_each_cpu(flush_backlog
, dev
, 1);
6307 list_for_each_entry(dev
, head
, unreg_list
) {
6308 struct sk_buff
*skb
= NULL
;
6310 /* Shutdown queueing discipline. */
6314 /* Notify protocols, that we are about to destroy
6315 this device. They should clean all the things.
6317 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6319 if (!dev
->rtnl_link_ops
||
6320 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6321 skb
= rtmsg_ifinfo_build_skb(RTM_DELLINK
, dev
, ~0U,
6325 * Flush the unicast and multicast chains
6330 if (dev
->netdev_ops
->ndo_uninit
)
6331 dev
->netdev_ops
->ndo_uninit(dev
);
6334 rtmsg_ifinfo_send(skb
, dev
, GFP_KERNEL
);
6336 /* Notifier chain MUST detach us all upper devices. */
6337 WARN_ON(netdev_has_any_upper_dev(dev
));
6339 /* Remove entries from kobject tree */
6340 netdev_unregister_kobject(dev
);
6342 /* Remove XPS queueing entries */
6343 netif_reset_xps_queues_gt(dev
, 0);
6349 list_for_each_entry(dev
, head
, unreg_list
)
6353 static void rollback_registered(struct net_device
*dev
)
6357 list_add(&dev
->unreg_list
, &single
);
6358 rollback_registered_many(&single
);
6362 static netdev_features_t
netdev_sync_upper_features(struct net_device
*lower
,
6363 struct net_device
*upper
, netdev_features_t features
)
6365 netdev_features_t upper_disables
= NETIF_F_UPPER_DISABLES
;
6366 netdev_features_t feature
;
6369 for_each_netdev_feature(&upper_disables
, feature_bit
) {
6370 feature
= __NETIF_F_BIT(feature_bit
);
6371 if (!(upper
->wanted_features
& feature
)
6372 && (features
& feature
)) {
6373 netdev_dbg(lower
, "Dropping feature %pNF, upper dev %s has it off.\n",
6374 &feature
, upper
->name
);
6375 features
&= ~feature
;
6382 static void netdev_sync_lower_features(struct net_device
*upper
,
6383 struct net_device
*lower
, netdev_features_t features
)
6385 netdev_features_t upper_disables
= NETIF_F_UPPER_DISABLES
;
6386 netdev_features_t feature
;
6389 for_each_netdev_feature(&upper_disables
, feature_bit
) {
6390 feature
= __NETIF_F_BIT(feature_bit
);
6391 if (!(features
& feature
) && (lower
->features
& feature
)) {
6392 netdev_dbg(upper
, "Disabling feature %pNF on lower dev %s.\n",
6393 &feature
, lower
->name
);
6394 lower
->wanted_features
&= ~feature
;
6395 netdev_update_features(lower
);
6397 if (unlikely(lower
->features
& feature
))
6398 netdev_WARN(upper
, "failed to disable %pNF on %s!\n",
6399 &feature
, lower
->name
);
6404 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
6405 netdev_features_t features
)
6407 /* Fix illegal checksum combinations */
6408 if ((features
& NETIF_F_HW_CSUM
) &&
6409 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6410 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
6411 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
6414 /* TSO requires that SG is present as well. */
6415 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
6416 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
6417 features
&= ~NETIF_F_ALL_TSO
;
6420 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
6421 !(features
& NETIF_F_IP_CSUM
)) {
6422 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
6423 features
&= ~NETIF_F_TSO
;
6424 features
&= ~NETIF_F_TSO_ECN
;
6427 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
6428 !(features
& NETIF_F_IPV6_CSUM
)) {
6429 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
6430 features
&= ~NETIF_F_TSO6
;
6433 /* TSO ECN requires that TSO is present as well. */
6434 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
6435 features
&= ~NETIF_F_TSO_ECN
;
6437 /* Software GSO depends on SG. */
6438 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
6439 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
6440 features
&= ~NETIF_F_GSO
;
6443 /* UFO needs SG and checksumming */
6444 if (features
& NETIF_F_UFO
) {
6445 /* maybe split UFO into V4 and V6? */
6446 if (!((features
& NETIF_F_GEN_CSUM
) ||
6447 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
6448 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6450 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6451 features
&= ~NETIF_F_UFO
;
6454 if (!(features
& NETIF_F_SG
)) {
6456 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6457 features
&= ~NETIF_F_UFO
;
6461 #ifdef CONFIG_NET_RX_BUSY_POLL
6462 if (dev
->netdev_ops
->ndo_busy_poll
)
6463 features
|= NETIF_F_BUSY_POLL
;
6466 features
&= ~NETIF_F_BUSY_POLL
;
6471 int __netdev_update_features(struct net_device
*dev
)
6473 struct net_device
*upper
, *lower
;
6474 netdev_features_t features
;
6475 struct list_head
*iter
;
6480 features
= netdev_get_wanted_features(dev
);
6482 if (dev
->netdev_ops
->ndo_fix_features
)
6483 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
6485 /* driver might be less strict about feature dependencies */
6486 features
= netdev_fix_features(dev
, features
);
6488 /* some features can't be enabled if they're off an an upper device */
6489 netdev_for_each_upper_dev_rcu(dev
, upper
, iter
)
6490 features
= netdev_sync_upper_features(dev
, upper
, features
);
6492 if (dev
->features
== features
)
6495 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
6496 &dev
->features
, &features
);
6498 if (dev
->netdev_ops
->ndo_set_features
)
6499 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
6503 if (unlikely(err
< 0)) {
6505 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6506 err
, &features
, &dev
->features
);
6507 /* return non-0 since some features might have changed and
6508 * it's better to fire a spurious notification than miss it
6514 /* some features must be disabled on lower devices when disabled
6515 * on an upper device (think: bonding master or bridge)
6517 netdev_for_each_lower_dev(dev
, lower
, iter
)
6518 netdev_sync_lower_features(dev
, lower
, features
);
6521 dev
->features
= features
;
6523 return err
< 0 ? 0 : 1;
6527 * netdev_update_features - recalculate device features
6528 * @dev: the device to check
6530 * Recalculate dev->features set and send notifications if it
6531 * has changed. Should be called after driver or hardware dependent
6532 * conditions might have changed that influence the features.
6534 void netdev_update_features(struct net_device
*dev
)
6536 if (__netdev_update_features(dev
))
6537 netdev_features_change(dev
);
6539 EXPORT_SYMBOL(netdev_update_features
);
6542 * netdev_change_features - recalculate device features
6543 * @dev: the device to check
6545 * Recalculate dev->features set and send notifications even
6546 * if they have not changed. Should be called instead of
6547 * netdev_update_features() if also dev->vlan_features might
6548 * have changed to allow the changes to be propagated to stacked
6551 void netdev_change_features(struct net_device
*dev
)
6553 __netdev_update_features(dev
);
6554 netdev_features_change(dev
);
6556 EXPORT_SYMBOL(netdev_change_features
);
6559 * netif_stacked_transfer_operstate - transfer operstate
6560 * @rootdev: the root or lower level device to transfer state from
6561 * @dev: the device to transfer operstate to
6563 * Transfer operational state from root to device. This is normally
6564 * called when a stacking relationship exists between the root
6565 * device and the device(a leaf device).
6567 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
6568 struct net_device
*dev
)
6570 if (rootdev
->operstate
== IF_OPER_DORMANT
)
6571 netif_dormant_on(dev
);
6573 netif_dormant_off(dev
);
6575 if (netif_carrier_ok(rootdev
)) {
6576 if (!netif_carrier_ok(dev
))
6577 netif_carrier_on(dev
);
6579 if (netif_carrier_ok(dev
))
6580 netif_carrier_off(dev
);
6583 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
6586 static int netif_alloc_rx_queues(struct net_device
*dev
)
6588 unsigned int i
, count
= dev
->num_rx_queues
;
6589 struct netdev_rx_queue
*rx
;
6590 size_t sz
= count
* sizeof(*rx
);
6594 rx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6602 for (i
= 0; i
< count
; i
++)
6608 static void netdev_init_one_queue(struct net_device
*dev
,
6609 struct netdev_queue
*queue
, void *_unused
)
6611 /* Initialize queue lock */
6612 spin_lock_init(&queue
->_xmit_lock
);
6613 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
6614 queue
->xmit_lock_owner
= -1;
6615 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
6618 dql_init(&queue
->dql
, HZ
);
6622 static void netif_free_tx_queues(struct net_device
*dev
)
6627 static int netif_alloc_netdev_queues(struct net_device
*dev
)
6629 unsigned int count
= dev
->num_tx_queues
;
6630 struct netdev_queue
*tx
;
6631 size_t sz
= count
* sizeof(*tx
);
6633 if (count
< 1 || count
> 0xffff)
6636 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6644 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
6645 spin_lock_init(&dev
->tx_global_lock
);
6650 void netif_tx_stop_all_queues(struct net_device
*dev
)
6654 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
6655 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
6656 netif_tx_stop_queue(txq
);
6659 EXPORT_SYMBOL(netif_tx_stop_all_queues
);
6662 * register_netdevice - register a network device
6663 * @dev: device to register
6665 * Take a completed network device structure and add it to the kernel
6666 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6667 * chain. 0 is returned on success. A negative errno code is returned
6668 * on a failure to set up the device, or if the name is a duplicate.
6670 * Callers must hold the rtnl semaphore. You may want
6671 * register_netdev() instead of this.
6674 * The locking appears insufficient to guarantee two parallel registers
6675 * will not get the same name.
6678 int register_netdevice(struct net_device
*dev
)
6681 struct net
*net
= dev_net(dev
);
6683 BUG_ON(dev_boot_phase
);
6688 /* When net_device's are persistent, this will be fatal. */
6689 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
6692 spin_lock_init(&dev
->addr_list_lock
);
6693 netdev_set_addr_lockdep_class(dev
);
6695 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
6699 /* Init, if this function is available */
6700 if (dev
->netdev_ops
->ndo_init
) {
6701 ret
= dev
->netdev_ops
->ndo_init(dev
);
6709 if (((dev
->hw_features
| dev
->features
) &
6710 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
6711 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
6712 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
6713 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
6720 dev
->ifindex
= dev_new_index(net
);
6721 else if (__dev_get_by_index(net
, dev
->ifindex
))
6724 /* Transfer changeable features to wanted_features and enable
6725 * software offloads (GSO and GRO).
6727 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
6728 dev
->features
|= NETIF_F_SOFT_FEATURES
;
6729 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
6731 if (!(dev
->flags
& IFF_LOOPBACK
)) {
6732 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
6735 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6737 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
6739 /* Make NETIF_F_SG inheritable to tunnel devices.
6741 dev
->hw_enc_features
|= NETIF_F_SG
;
6743 /* Make NETIF_F_SG inheritable to MPLS.
6745 dev
->mpls_features
|= NETIF_F_SG
;
6747 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
6748 ret
= notifier_to_errno(ret
);
6752 ret
= netdev_register_kobject(dev
);
6755 dev
->reg_state
= NETREG_REGISTERED
;
6757 __netdev_update_features(dev
);
6760 * Default initial state at registry is that the
6761 * device is present.
6764 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6766 linkwatch_init_dev(dev
);
6768 dev_init_scheduler(dev
);
6770 list_netdevice(dev
);
6771 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6773 /* If the device has permanent device address, driver should
6774 * set dev_addr and also addr_assign_type should be set to
6775 * NET_ADDR_PERM (default value).
6777 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
6778 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
6780 /* Notify protocols, that a new device appeared. */
6781 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6782 ret
= notifier_to_errno(ret
);
6784 rollback_registered(dev
);
6785 dev
->reg_state
= NETREG_UNREGISTERED
;
6788 * Prevent userspace races by waiting until the network
6789 * device is fully setup before sending notifications.
6791 if (!dev
->rtnl_link_ops
||
6792 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6793 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6799 if (dev
->netdev_ops
->ndo_uninit
)
6800 dev
->netdev_ops
->ndo_uninit(dev
);
6803 EXPORT_SYMBOL(register_netdevice
);
6806 * init_dummy_netdev - init a dummy network device for NAPI
6807 * @dev: device to init
6809 * This takes a network device structure and initialize the minimum
6810 * amount of fields so it can be used to schedule NAPI polls without
6811 * registering a full blown interface. This is to be used by drivers
6812 * that need to tie several hardware interfaces to a single NAPI
6813 * poll scheduler due to HW limitations.
6815 int init_dummy_netdev(struct net_device
*dev
)
6817 /* Clear everything. Note we don't initialize spinlocks
6818 * are they aren't supposed to be taken by any of the
6819 * NAPI code and this dummy netdev is supposed to be
6820 * only ever used for NAPI polls
6822 memset(dev
, 0, sizeof(struct net_device
));
6824 /* make sure we BUG if trying to hit standard
6825 * register/unregister code path
6827 dev
->reg_state
= NETREG_DUMMY
;
6829 /* NAPI wants this */
6830 INIT_LIST_HEAD(&dev
->napi_list
);
6832 /* a dummy interface is started by default */
6833 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6834 set_bit(__LINK_STATE_START
, &dev
->state
);
6836 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6837 * because users of this 'device' dont need to change
6843 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
6847 * register_netdev - register a network device
6848 * @dev: device to register
6850 * Take a completed network device structure and add it to the kernel
6851 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6852 * chain. 0 is returned on success. A negative errno code is returned
6853 * on a failure to set up the device, or if the name is a duplicate.
6855 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6856 * and expands the device name if you passed a format string to
6859 int register_netdev(struct net_device
*dev
)
6864 err
= register_netdevice(dev
);
6868 EXPORT_SYMBOL(register_netdev
);
6870 int netdev_refcnt_read(const struct net_device
*dev
)
6874 for_each_possible_cpu(i
)
6875 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
6878 EXPORT_SYMBOL(netdev_refcnt_read
);
6881 * netdev_wait_allrefs - wait until all references are gone.
6882 * @dev: target net_device
6884 * This is called when unregistering network devices.
6886 * Any protocol or device that holds a reference should register
6887 * for netdevice notification, and cleanup and put back the
6888 * reference if they receive an UNREGISTER event.
6889 * We can get stuck here if buggy protocols don't correctly
6892 static void netdev_wait_allrefs(struct net_device
*dev
)
6894 unsigned long rebroadcast_time
, warning_time
;
6897 linkwatch_forget_dev(dev
);
6899 rebroadcast_time
= warning_time
= jiffies
;
6900 refcnt
= netdev_refcnt_read(dev
);
6902 while (refcnt
!= 0) {
6903 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
6906 /* Rebroadcast unregister notification */
6907 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6913 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6914 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
6916 /* We must not have linkwatch events
6917 * pending on unregister. If this
6918 * happens, we simply run the queue
6919 * unscheduled, resulting in a noop
6922 linkwatch_run_queue();
6927 rebroadcast_time
= jiffies
;
6932 refcnt
= netdev_refcnt_read(dev
);
6934 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
6935 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6937 warning_time
= jiffies
;
6946 * register_netdevice(x1);
6947 * register_netdevice(x2);
6949 * unregister_netdevice(y1);
6950 * unregister_netdevice(y2);
6956 * We are invoked by rtnl_unlock().
6957 * This allows us to deal with problems:
6958 * 1) We can delete sysfs objects which invoke hotplug
6959 * without deadlocking with linkwatch via keventd.
6960 * 2) Since we run with the RTNL semaphore not held, we can sleep
6961 * safely in order to wait for the netdev refcnt to drop to zero.
6963 * We must not return until all unregister events added during
6964 * the interval the lock was held have been completed.
6966 void netdev_run_todo(void)
6968 struct list_head list
;
6970 /* Snapshot list, allow later requests */
6971 list_replace_init(&net_todo_list
, &list
);
6976 /* Wait for rcu callbacks to finish before next phase */
6977 if (!list_empty(&list
))
6980 while (!list_empty(&list
)) {
6981 struct net_device
*dev
6982 = list_first_entry(&list
, struct net_device
, todo_list
);
6983 list_del(&dev
->todo_list
);
6986 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6989 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
6990 pr_err("network todo '%s' but state %d\n",
6991 dev
->name
, dev
->reg_state
);
6996 dev
->reg_state
= NETREG_UNREGISTERED
;
6998 netdev_wait_allrefs(dev
);
7001 BUG_ON(netdev_refcnt_read(dev
));
7002 BUG_ON(!list_empty(&dev
->ptype_all
));
7003 BUG_ON(!list_empty(&dev
->ptype_specific
));
7004 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
7005 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
7006 WARN_ON(dev
->dn_ptr
);
7008 if (dev
->destructor
)
7009 dev
->destructor(dev
);
7011 /* Report a network device has been unregistered */
7013 dev_net(dev
)->dev_unreg_count
--;
7015 wake_up(&netdev_unregistering_wq
);
7017 /* Free network device */
7018 kobject_put(&dev
->dev
.kobj
);
7022 /* Convert net_device_stats to rtnl_link_stats64. They have the same
7023 * fields in the same order, with only the type differing.
7025 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
7026 const struct net_device_stats
*netdev_stats
)
7028 #if BITS_PER_LONG == 64
7029 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
7030 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
7032 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
7033 const unsigned long *src
= (const unsigned long *)netdev_stats
;
7034 u64
*dst
= (u64
*)stats64
;
7036 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
7037 sizeof(*stats64
) / sizeof(u64
));
7038 for (i
= 0; i
< n
; i
++)
7042 EXPORT_SYMBOL(netdev_stats_to_stats64
);
7045 * dev_get_stats - get network device statistics
7046 * @dev: device to get statistics from
7047 * @storage: place to store stats
7049 * Get network statistics from device. Return @storage.
7050 * The device driver may provide its own method by setting
7051 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
7052 * otherwise the internal statistics structure is used.
7054 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
7055 struct rtnl_link_stats64
*storage
)
7057 const struct net_device_ops
*ops
= dev
->netdev_ops
;
7059 if (ops
->ndo_get_stats64
) {
7060 memset(storage
, 0, sizeof(*storage
));
7061 ops
->ndo_get_stats64(dev
, storage
);
7062 } else if (ops
->ndo_get_stats
) {
7063 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
7065 netdev_stats_to_stats64(storage
, &dev
->stats
);
7067 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
7068 storage
->tx_dropped
+= atomic_long_read(&dev
->tx_dropped
);
7071 EXPORT_SYMBOL(dev_get_stats
);
7073 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
7075 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
7077 #ifdef CONFIG_NET_CLS_ACT
7080 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
7083 netdev_init_one_queue(dev
, queue
, NULL
);
7084 RCU_INIT_POINTER(queue
->qdisc
, &noop_qdisc
);
7085 queue
->qdisc_sleeping
= &noop_qdisc
;
7086 rcu_assign_pointer(dev
->ingress_queue
, queue
);
7091 static const struct ethtool_ops default_ethtool_ops
;
7093 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
7094 const struct ethtool_ops
*ops
)
7096 if (dev
->ethtool_ops
== &default_ethtool_ops
)
7097 dev
->ethtool_ops
= ops
;
7099 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
7101 void netdev_freemem(struct net_device
*dev
)
7103 char *addr
= (char *)dev
- dev
->padded
;
7109 * alloc_netdev_mqs - allocate network device
7110 * @sizeof_priv: size of private data to allocate space for
7111 * @name: device name format string
7112 * @name_assign_type: origin of device name
7113 * @setup: callback to initialize device
7114 * @txqs: the number of TX subqueues to allocate
7115 * @rxqs: the number of RX subqueues to allocate
7117 * Allocates a struct net_device with private data area for driver use
7118 * and performs basic initialization. Also allocates subqueue structs
7119 * for each queue on the device.
7121 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
7122 unsigned char name_assign_type
,
7123 void (*setup
)(struct net_device
*),
7124 unsigned int txqs
, unsigned int rxqs
)
7126 struct net_device
*dev
;
7128 struct net_device
*p
;
7130 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
7133 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
7139 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
7144 alloc_size
= sizeof(struct net_device
);
7146 /* ensure 32-byte alignment of private area */
7147 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
7148 alloc_size
+= sizeof_priv
;
7150 /* ensure 32-byte alignment of whole construct */
7151 alloc_size
+= NETDEV_ALIGN
- 1;
7153 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
7155 p
= vzalloc(alloc_size
);
7159 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
7160 dev
->padded
= (char *)dev
- (char *)p
;
7162 dev
->pcpu_refcnt
= alloc_percpu(int);
7163 if (!dev
->pcpu_refcnt
)
7166 if (dev_addr_init(dev
))
7172 dev_net_set(dev
, &init_net
);
7174 dev
->gso_max_size
= GSO_MAX_SIZE
;
7175 dev
->gso_max_segs
= GSO_MAX_SEGS
;
7176 dev
->gso_min_segs
= 0;
7178 INIT_LIST_HEAD(&dev
->napi_list
);
7179 INIT_LIST_HEAD(&dev
->unreg_list
);
7180 INIT_LIST_HEAD(&dev
->close_list
);
7181 INIT_LIST_HEAD(&dev
->link_watch_list
);
7182 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
7183 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
7184 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
7185 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
7186 INIT_LIST_HEAD(&dev
->ptype_all
);
7187 INIT_LIST_HEAD(&dev
->ptype_specific
);
7188 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
| IFF_XMIT_DST_RELEASE_PERM
;
7191 if (!dev
->tx_queue_len
)
7192 dev
->priv_flags
|= IFF_NO_QUEUE
;
7194 dev
->num_tx_queues
= txqs
;
7195 dev
->real_num_tx_queues
= txqs
;
7196 if (netif_alloc_netdev_queues(dev
))
7200 dev
->num_rx_queues
= rxqs
;
7201 dev
->real_num_rx_queues
= rxqs
;
7202 if (netif_alloc_rx_queues(dev
))
7206 strcpy(dev
->name
, name
);
7207 dev
->name_assign_type
= name_assign_type
;
7208 dev
->group
= INIT_NETDEV_GROUP
;
7209 if (!dev
->ethtool_ops
)
7210 dev
->ethtool_ops
= &default_ethtool_ops
;
7212 nf_hook_ingress_init(dev
);
7221 free_percpu(dev
->pcpu_refcnt
);
7223 netdev_freemem(dev
);
7226 EXPORT_SYMBOL(alloc_netdev_mqs
);
7229 * free_netdev - free network device
7232 * This function does the last stage of destroying an allocated device
7233 * interface. The reference to the device object is released.
7234 * If this is the last reference then it will be freed.
7235 * Must be called in process context.
7237 void free_netdev(struct net_device
*dev
)
7239 struct napi_struct
*p
, *n
;
7242 netif_free_tx_queues(dev
);
7247 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
7249 /* Flush device addresses */
7250 dev_addr_flush(dev
);
7252 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
7255 free_percpu(dev
->pcpu_refcnt
);
7256 dev
->pcpu_refcnt
= NULL
;
7258 /* Compatibility with error handling in drivers */
7259 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
7260 netdev_freemem(dev
);
7264 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
7265 dev
->reg_state
= NETREG_RELEASED
;
7267 /* will free via device release */
7268 put_device(&dev
->dev
);
7270 EXPORT_SYMBOL(free_netdev
);
7273 * synchronize_net - Synchronize with packet receive processing
7275 * Wait for packets currently being received to be done.
7276 * Does not block later packets from starting.
7278 void synchronize_net(void)
7281 if (rtnl_is_locked())
7282 synchronize_rcu_expedited();
7286 EXPORT_SYMBOL(synchronize_net
);
7289 * unregister_netdevice_queue - remove device from the kernel
7293 * This function shuts down a device interface and removes it
7294 * from the kernel tables.
7295 * If head not NULL, device is queued to be unregistered later.
7297 * Callers must hold the rtnl semaphore. You may want
7298 * unregister_netdev() instead of this.
7301 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
7306 list_move_tail(&dev
->unreg_list
, head
);
7308 rollback_registered(dev
);
7309 /* Finish processing unregister after unlock */
7313 EXPORT_SYMBOL(unregister_netdevice_queue
);
7316 * unregister_netdevice_many - unregister many devices
7317 * @head: list of devices
7319 * Note: As most callers use a stack allocated list_head,
7320 * we force a list_del() to make sure stack wont be corrupted later.
7322 void unregister_netdevice_many(struct list_head
*head
)
7324 struct net_device
*dev
;
7326 if (!list_empty(head
)) {
7327 rollback_registered_many(head
);
7328 list_for_each_entry(dev
, head
, unreg_list
)
7333 EXPORT_SYMBOL(unregister_netdevice_many
);
7336 * unregister_netdev - remove device from the kernel
7339 * This function shuts down a device interface and removes it
7340 * from the kernel tables.
7342 * This is just a wrapper for unregister_netdevice that takes
7343 * the rtnl semaphore. In general you want to use this and not
7344 * unregister_netdevice.
7346 void unregister_netdev(struct net_device
*dev
)
7349 unregister_netdevice(dev
);
7352 EXPORT_SYMBOL(unregister_netdev
);
7355 * dev_change_net_namespace - move device to different nethost namespace
7357 * @net: network namespace
7358 * @pat: If not NULL name pattern to try if the current device name
7359 * is already taken in the destination network namespace.
7361 * This function shuts down a device interface and moves it
7362 * to a new network namespace. On success 0 is returned, on
7363 * a failure a netagive errno code is returned.
7365 * Callers must hold the rtnl semaphore.
7368 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
7374 /* Don't allow namespace local devices to be moved. */
7376 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7379 /* Ensure the device has been registrered */
7380 if (dev
->reg_state
!= NETREG_REGISTERED
)
7383 /* Get out if there is nothing todo */
7385 if (net_eq(dev_net(dev
), net
))
7388 /* Pick the destination device name, and ensure
7389 * we can use it in the destination network namespace.
7392 if (__dev_get_by_name(net
, dev
->name
)) {
7393 /* We get here if we can't use the current device name */
7396 if (dev_get_valid_name(net
, dev
, pat
) < 0)
7401 * And now a mini version of register_netdevice unregister_netdevice.
7404 /* If device is running close it first. */
7407 /* And unlink it from device chain */
7409 unlist_netdevice(dev
);
7413 /* Shutdown queueing discipline. */
7416 /* Notify protocols, that we are about to destroy
7417 this device. They should clean all the things.
7419 Note that dev->reg_state stays at NETREG_REGISTERED.
7420 This is wanted because this way 8021q and macvlan know
7421 the device is just moving and can keep their slaves up.
7423 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
7425 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7426 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
7429 * Flush the unicast and multicast chains
7434 /* Send a netdev-removed uevent to the old namespace */
7435 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
7436 netdev_adjacent_del_links(dev
);
7438 /* Actually switch the network namespace */
7439 dev_net_set(dev
, net
);
7441 /* If there is an ifindex conflict assign a new one */
7442 if (__dev_get_by_index(net
, dev
->ifindex
))
7443 dev
->ifindex
= dev_new_index(net
);
7445 /* Send a netdev-add uevent to the new namespace */
7446 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
7447 netdev_adjacent_add_links(dev
);
7449 /* Fixup kobjects */
7450 err
= device_rename(&dev
->dev
, dev
->name
);
7453 /* Add the device back in the hashes */
7454 list_netdevice(dev
);
7456 /* Notify protocols, that a new device appeared. */
7457 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
7460 * Prevent userspace races by waiting until the network
7461 * device is fully setup before sending notifications.
7463 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
7470 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
7472 static int dev_cpu_callback(struct notifier_block
*nfb
,
7473 unsigned long action
,
7476 struct sk_buff
**list_skb
;
7477 struct sk_buff
*skb
;
7478 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
7479 struct softnet_data
*sd
, *oldsd
;
7481 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
7484 local_irq_disable();
7485 cpu
= smp_processor_id();
7486 sd
= &per_cpu(softnet_data
, cpu
);
7487 oldsd
= &per_cpu(softnet_data
, oldcpu
);
7489 /* Find end of our completion_queue. */
7490 list_skb
= &sd
->completion_queue
;
7492 list_skb
= &(*list_skb
)->next
;
7493 /* Append completion queue from offline CPU. */
7494 *list_skb
= oldsd
->completion_queue
;
7495 oldsd
->completion_queue
= NULL
;
7497 /* Append output queue from offline CPU. */
7498 if (oldsd
->output_queue
) {
7499 *sd
->output_queue_tailp
= oldsd
->output_queue
;
7500 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
7501 oldsd
->output_queue
= NULL
;
7502 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
7504 /* Append NAPI poll list from offline CPU, with one exception :
7505 * process_backlog() must be called by cpu owning percpu backlog.
7506 * We properly handle process_queue & input_pkt_queue later.
7508 while (!list_empty(&oldsd
->poll_list
)) {
7509 struct napi_struct
*napi
= list_first_entry(&oldsd
->poll_list
,
7513 list_del_init(&napi
->poll_list
);
7514 if (napi
->poll
== process_backlog
)
7517 ____napi_schedule(sd
, napi
);
7520 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
7523 /* Process offline CPU's input_pkt_queue */
7524 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
7526 input_queue_head_incr(oldsd
);
7528 while ((skb
= skb_dequeue(&oldsd
->input_pkt_queue
))) {
7530 input_queue_head_incr(oldsd
);
7538 * netdev_increment_features - increment feature set by one
7539 * @all: current feature set
7540 * @one: new feature set
7541 * @mask: mask feature set
7543 * Computes a new feature set after adding a device with feature set
7544 * @one to the master device with current feature set @all. Will not
7545 * enable anything that is off in @mask. Returns the new feature set.
7547 netdev_features_t
netdev_increment_features(netdev_features_t all
,
7548 netdev_features_t one
, netdev_features_t mask
)
7550 if (mask
& NETIF_F_GEN_CSUM
)
7551 mask
|= NETIF_F_ALL_CSUM
;
7552 mask
|= NETIF_F_VLAN_CHALLENGED
;
7554 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
7555 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
7557 /* If one device supports hw checksumming, set for all. */
7558 if (all
& NETIF_F_GEN_CSUM
)
7559 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
7563 EXPORT_SYMBOL(netdev_increment_features
);
7565 static struct hlist_head
* __net_init
netdev_create_hash(void)
7568 struct hlist_head
*hash
;
7570 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
7572 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
7573 INIT_HLIST_HEAD(&hash
[i
]);
7578 /* Initialize per network namespace state */
7579 static int __net_init
netdev_init(struct net
*net
)
7581 if (net
!= &init_net
)
7582 INIT_LIST_HEAD(&net
->dev_base_head
);
7584 net
->dev_name_head
= netdev_create_hash();
7585 if (net
->dev_name_head
== NULL
)
7588 net
->dev_index_head
= netdev_create_hash();
7589 if (net
->dev_index_head
== NULL
)
7595 kfree(net
->dev_name_head
);
7601 * netdev_drivername - network driver for the device
7602 * @dev: network device
7604 * Determine network driver for device.
7606 const char *netdev_drivername(const struct net_device
*dev
)
7608 const struct device_driver
*driver
;
7609 const struct device
*parent
;
7610 const char *empty
= "";
7612 parent
= dev
->dev
.parent
;
7616 driver
= parent
->driver
;
7617 if (driver
&& driver
->name
)
7618 return driver
->name
;
7622 static void __netdev_printk(const char *level
, const struct net_device
*dev
,
7623 struct va_format
*vaf
)
7625 if (dev
&& dev
->dev
.parent
) {
7626 dev_printk_emit(level
[1] - '0',
7629 dev_driver_string(dev
->dev
.parent
),
7630 dev_name(dev
->dev
.parent
),
7631 netdev_name(dev
), netdev_reg_state(dev
),
7634 printk("%s%s%s: %pV",
7635 level
, netdev_name(dev
), netdev_reg_state(dev
), vaf
);
7637 printk("%s(NULL net_device): %pV", level
, vaf
);
7641 void netdev_printk(const char *level
, const struct net_device
*dev
,
7642 const char *format
, ...)
7644 struct va_format vaf
;
7647 va_start(args
, format
);
7652 __netdev_printk(level
, dev
, &vaf
);
7656 EXPORT_SYMBOL(netdev_printk
);
7658 #define define_netdev_printk_level(func, level) \
7659 void func(const struct net_device *dev, const char *fmt, ...) \
7661 struct va_format vaf; \
7664 va_start(args, fmt); \
7669 __netdev_printk(level, dev, &vaf); \
7673 EXPORT_SYMBOL(func);
7675 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
7676 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
7677 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
7678 define_netdev_printk_level(netdev_err
, KERN_ERR
);
7679 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
7680 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
7681 define_netdev_printk_level(netdev_info
, KERN_INFO
);
7683 static void __net_exit
netdev_exit(struct net
*net
)
7685 kfree(net
->dev_name_head
);
7686 kfree(net
->dev_index_head
);
7689 static struct pernet_operations __net_initdata netdev_net_ops
= {
7690 .init
= netdev_init
,
7691 .exit
= netdev_exit
,
7694 static void __net_exit
default_device_exit(struct net
*net
)
7696 struct net_device
*dev
, *aux
;
7698 * Push all migratable network devices back to the
7699 * initial network namespace
7702 for_each_netdev_safe(net
, dev
, aux
) {
7704 char fb_name
[IFNAMSIZ
];
7706 /* Ignore unmoveable devices (i.e. loopback) */
7707 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7710 /* Leave virtual devices for the generic cleanup */
7711 if (dev
->rtnl_link_ops
)
7714 /* Push remaining network devices to init_net */
7715 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
7716 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
7718 pr_emerg("%s: failed to move %s to init_net: %d\n",
7719 __func__
, dev
->name
, err
);
7726 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
7728 /* Return with the rtnl_lock held when there are no network
7729 * devices unregistering in any network namespace in net_list.
7733 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
7735 add_wait_queue(&netdev_unregistering_wq
, &wait
);
7737 unregistering
= false;
7739 list_for_each_entry(net
, net_list
, exit_list
) {
7740 if (net
->dev_unreg_count
> 0) {
7741 unregistering
= true;
7749 wait_woken(&wait
, TASK_UNINTERRUPTIBLE
, MAX_SCHEDULE_TIMEOUT
);
7751 remove_wait_queue(&netdev_unregistering_wq
, &wait
);
7754 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
7756 /* At exit all network devices most be removed from a network
7757 * namespace. Do this in the reverse order of registration.
7758 * Do this across as many network namespaces as possible to
7759 * improve batching efficiency.
7761 struct net_device
*dev
;
7763 LIST_HEAD(dev_kill_list
);
7765 /* To prevent network device cleanup code from dereferencing
7766 * loopback devices or network devices that have been freed
7767 * wait here for all pending unregistrations to complete,
7768 * before unregistring the loopback device and allowing the
7769 * network namespace be freed.
7771 * The netdev todo list containing all network devices
7772 * unregistrations that happen in default_device_exit_batch
7773 * will run in the rtnl_unlock() at the end of
7774 * default_device_exit_batch.
7776 rtnl_lock_unregistering(net_list
);
7777 list_for_each_entry(net
, net_list
, exit_list
) {
7778 for_each_netdev_reverse(net
, dev
) {
7779 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
)
7780 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
7782 unregister_netdevice_queue(dev
, &dev_kill_list
);
7785 unregister_netdevice_many(&dev_kill_list
);
7789 static struct pernet_operations __net_initdata default_device_ops
= {
7790 .exit
= default_device_exit
,
7791 .exit_batch
= default_device_exit_batch
,
7795 * Initialize the DEV module. At boot time this walks the device list and
7796 * unhooks any devices that fail to initialise (normally hardware not
7797 * present) and leaves us with a valid list of present and active devices.
7802 * This is called single threaded during boot, so no need
7803 * to take the rtnl semaphore.
7805 static int __init
net_dev_init(void)
7807 int i
, rc
= -ENOMEM
;
7809 BUG_ON(!dev_boot_phase
);
7811 if (dev_proc_init())
7814 if (netdev_kobject_init())
7817 INIT_LIST_HEAD(&ptype_all
);
7818 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
7819 INIT_LIST_HEAD(&ptype_base
[i
]);
7821 INIT_LIST_HEAD(&offload_base
);
7823 if (register_pernet_subsys(&netdev_net_ops
))
7827 * Initialise the packet receive queues.
7830 for_each_possible_cpu(i
) {
7831 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
7833 skb_queue_head_init(&sd
->input_pkt_queue
);
7834 skb_queue_head_init(&sd
->process_queue
);
7835 INIT_LIST_HEAD(&sd
->poll_list
);
7836 sd
->output_queue_tailp
= &sd
->output_queue
;
7838 sd
->csd
.func
= rps_trigger_softirq
;
7843 sd
->backlog
.poll
= process_backlog
;
7844 sd
->backlog
.weight
= weight_p
;
7849 /* The loopback device is special if any other network devices
7850 * is present in a network namespace the loopback device must
7851 * be present. Since we now dynamically allocate and free the
7852 * loopback device ensure this invariant is maintained by
7853 * keeping the loopback device as the first device on the
7854 * list of network devices. Ensuring the loopback devices
7855 * is the first device that appears and the last network device
7858 if (register_pernet_device(&loopback_net_ops
))
7861 if (register_pernet_device(&default_device_ops
))
7864 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
7865 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
7867 hotcpu_notifier(dev_cpu_callback
, 0);
7874 subsys_initcall(net_dev_init
);