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 <linux/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/sched/mm.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <linux/bpf.h>
99 #include <linux/bpf_trace.h>
100 #include <net/net_namespace.h>
101 #include <net/sock.h>
102 #include <net/busy_poll.h>
103 #include <linux/rtnetlink.h>
104 #include <linux/stat.h>
106 #include <net/dst_metadata.h>
107 #include <net/pkt_sched.h>
108 #include <net/pkt_cls.h>
109 #include <net/checksum.h>
110 #include <net/xfrm.h>
111 #include <linux/highmem.h>
112 #include <linux/init.h>
113 #include <linux/module.h>
114 #include <linux/netpoll.h>
115 #include <linux/rcupdate.h>
116 #include <linux/delay.h>
117 #include <net/iw_handler.h>
118 #include <asm/current.h>
119 #include <linux/audit.h>
120 #include <linux/dmaengine.h>
121 #include <linux/err.h>
122 #include <linux/ctype.h>
123 #include <linux/if_arp.h>
124 #include <linux/if_vlan.h>
125 #include <linux/ip.h>
127 #include <net/mpls.h>
128 #include <linux/ipv6.h>
129 #include <linux/in.h>
130 #include <linux/jhash.h>
131 #include <linux/random.h>
132 #include <trace/events/napi.h>
133 #include <trace/events/net.h>
134 #include <trace/events/skb.h>
135 #include <linux/pci.h>
136 #include <linux/inetdevice.h>
137 #include <linux/cpu_rmap.h>
138 #include <linux/static_key.h>
139 #include <linux/hashtable.h>
140 #include <linux/vmalloc.h>
141 #include <linux/if_macvlan.h>
142 #include <linux/errqueue.h>
143 #include <linux/hrtimer.h>
144 #include <linux/netfilter_ingress.h>
145 #include <linux/crash_dump.h>
146 #include <linux/sctp.h>
147 #include <net/udp_tunnel.h>
148 #include <linux/net_namespace.h>
150 #include "net-sysfs.h"
152 /* Instead of increasing this, you should create a hash table. */
153 #define MAX_GRO_SKBS 8
155 /* This should be increased if a protocol with a bigger head is added. */
156 #define GRO_MAX_HEAD (MAX_HEADER + 128)
158 static DEFINE_SPINLOCK(ptype_lock
);
159 static DEFINE_SPINLOCK(offload_lock
);
160 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
161 struct list_head ptype_all __read_mostly
; /* Taps */
162 static struct list_head offload_base __read_mostly
;
164 static int netif_rx_internal(struct sk_buff
*skb
);
165 static int call_netdevice_notifiers_info(unsigned long val
,
166 struct netdev_notifier_info
*info
);
167 static struct napi_struct
*napi_by_id(unsigned int napi_id
);
170 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
173 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
175 * Writers must hold the rtnl semaphore while they loop through the
176 * dev_base_head list, and hold dev_base_lock for writing when they do the
177 * actual updates. This allows pure readers to access the list even
178 * while a writer is preparing to update it.
180 * To put it another way, dev_base_lock is held for writing only to
181 * protect against pure readers; the rtnl semaphore provides the
182 * protection against other writers.
184 * See, for example usages, register_netdevice() and
185 * unregister_netdevice(), which must be called with the rtnl
188 DEFINE_RWLOCK(dev_base_lock
);
189 EXPORT_SYMBOL(dev_base_lock
);
191 static DEFINE_MUTEX(ifalias_mutex
);
193 /* protects napi_hash addition/deletion and napi_gen_id */
194 static DEFINE_SPINLOCK(napi_hash_lock
);
196 static unsigned int napi_gen_id
= NR_CPUS
;
197 static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash
, 8);
199 static seqcount_t devnet_rename_seq
;
201 static inline void dev_base_seq_inc(struct net
*net
)
203 while (++net
->dev_base_seq
== 0)
207 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
209 unsigned int hash
= full_name_hash(net
, name
, strnlen(name
, IFNAMSIZ
));
211 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
214 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
216 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
219 static inline void rps_lock(struct softnet_data
*sd
)
222 spin_lock(&sd
->input_pkt_queue
.lock
);
226 static inline void rps_unlock(struct softnet_data
*sd
)
229 spin_unlock(&sd
->input_pkt_queue
.lock
);
233 /* Device list insertion */
234 static void list_netdevice(struct net_device
*dev
)
236 struct net
*net
= dev_net(dev
);
240 write_lock_bh(&dev_base_lock
);
241 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
242 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
243 hlist_add_head_rcu(&dev
->index_hlist
,
244 dev_index_hash(net
, dev
->ifindex
));
245 write_unlock_bh(&dev_base_lock
);
247 dev_base_seq_inc(net
);
250 /* Device list removal
251 * caller must respect a RCU grace period before freeing/reusing dev
253 static void unlist_netdevice(struct net_device
*dev
)
257 /* Unlink dev from the device chain */
258 write_lock_bh(&dev_base_lock
);
259 list_del_rcu(&dev
->dev_list
);
260 hlist_del_rcu(&dev
->name_hlist
);
261 hlist_del_rcu(&dev
->index_hlist
);
262 write_unlock_bh(&dev_base_lock
);
264 dev_base_seq_inc(dev_net(dev
));
271 static RAW_NOTIFIER_HEAD(netdev_chain
);
274 * Device drivers call our routines to queue packets here. We empty the
275 * queue in the local softnet handler.
278 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
279 EXPORT_PER_CPU_SYMBOL(softnet_data
);
281 #ifdef CONFIG_LOCKDEP
283 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
284 * according to dev->type
286 static const unsigned short netdev_lock_type
[] = {
287 ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
288 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
289 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
290 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
291 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
292 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
293 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
294 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
295 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
296 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
297 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
298 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
299 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
300 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
301 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
303 static const char *const netdev_lock_name
[] = {
304 "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
305 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
306 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
307 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
308 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
309 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
310 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
311 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
312 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
313 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
314 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
315 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
316 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
317 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
318 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
320 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
321 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
323 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
327 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
328 if (netdev_lock_type
[i
] == dev_type
)
330 /* the last key is used by default */
331 return ARRAY_SIZE(netdev_lock_type
) - 1;
334 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
335 unsigned short dev_type
)
339 i
= netdev_lock_pos(dev_type
);
340 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
341 netdev_lock_name
[i
]);
344 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
348 i
= netdev_lock_pos(dev
->type
);
349 lockdep_set_class_and_name(&dev
->addr_list_lock
,
350 &netdev_addr_lock_key
[i
],
351 netdev_lock_name
[i
]);
354 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
355 unsigned short dev_type
)
358 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
363 /*******************************************************************************
365 * Protocol management and registration routines
367 *******************************************************************************/
371 * Add a protocol ID to the list. Now that the input handler is
372 * smarter we can dispense with all the messy stuff that used to be
375 * BEWARE!!! Protocol handlers, mangling input packets,
376 * MUST BE last in hash buckets and checking protocol handlers
377 * MUST start from promiscuous ptype_all chain in net_bh.
378 * It is true now, do not change it.
379 * Explanation follows: if protocol handler, mangling packet, will
380 * be the first on list, it is not able to sense, that packet
381 * is cloned and should be copied-on-write, so that it will
382 * change it and subsequent readers will get broken packet.
386 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
388 if (pt
->type
== htons(ETH_P_ALL
))
389 return pt
->dev
? &pt
->dev
->ptype_all
: &ptype_all
;
391 return pt
->dev
? &pt
->dev
->ptype_specific
:
392 &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
396 * dev_add_pack - add packet handler
397 * @pt: packet type declaration
399 * Add a protocol handler to the networking stack. The passed &packet_type
400 * is linked into kernel lists and may not be freed until it has been
401 * removed from the kernel lists.
403 * This call does not sleep therefore it can not
404 * guarantee all CPU's that are in middle of receiving packets
405 * will see the new packet type (until the next received packet).
408 void dev_add_pack(struct packet_type
*pt
)
410 struct list_head
*head
= ptype_head(pt
);
412 spin_lock(&ptype_lock
);
413 list_add_rcu(&pt
->list
, head
);
414 spin_unlock(&ptype_lock
);
416 EXPORT_SYMBOL(dev_add_pack
);
419 * __dev_remove_pack - remove packet handler
420 * @pt: packet type declaration
422 * Remove a protocol handler that was previously added to the kernel
423 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
424 * from the kernel lists and can be freed or reused once this function
427 * The packet type might still be in use by receivers
428 * and must not be freed until after all the CPU's have gone
429 * through a quiescent state.
431 void __dev_remove_pack(struct packet_type
*pt
)
433 struct list_head
*head
= ptype_head(pt
);
434 struct packet_type
*pt1
;
436 spin_lock(&ptype_lock
);
438 list_for_each_entry(pt1
, head
, list
) {
440 list_del_rcu(&pt
->list
);
445 pr_warn("dev_remove_pack: %p not found\n", pt
);
447 spin_unlock(&ptype_lock
);
449 EXPORT_SYMBOL(__dev_remove_pack
);
452 * dev_remove_pack - remove packet handler
453 * @pt: packet type declaration
455 * Remove a protocol handler that was previously added to the kernel
456 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
457 * from the kernel lists and can be freed or reused once this function
460 * This call sleeps to guarantee that no CPU is looking at the packet
463 void dev_remove_pack(struct packet_type
*pt
)
465 __dev_remove_pack(pt
);
469 EXPORT_SYMBOL(dev_remove_pack
);
473 * dev_add_offload - register offload handlers
474 * @po: protocol offload declaration
476 * Add protocol offload handlers to the networking stack. The passed
477 * &proto_offload is linked into kernel lists and may not be freed until
478 * it has been removed from the kernel lists.
480 * This call does not sleep therefore it can not
481 * guarantee all CPU's that are in middle of receiving packets
482 * will see the new offload handlers (until the next received packet).
484 void dev_add_offload(struct packet_offload
*po
)
486 struct packet_offload
*elem
;
488 spin_lock(&offload_lock
);
489 list_for_each_entry(elem
, &offload_base
, list
) {
490 if (po
->priority
< elem
->priority
)
493 list_add_rcu(&po
->list
, elem
->list
.prev
);
494 spin_unlock(&offload_lock
);
496 EXPORT_SYMBOL(dev_add_offload
);
499 * __dev_remove_offload - remove offload handler
500 * @po: packet offload declaration
502 * Remove a protocol offload handler that was previously added to the
503 * kernel offload handlers by dev_add_offload(). The passed &offload_type
504 * is removed from the kernel lists and can be freed or reused once this
507 * The packet type might still be in use by receivers
508 * and must not be freed until after all the CPU's have gone
509 * through a quiescent state.
511 static void __dev_remove_offload(struct packet_offload
*po
)
513 struct list_head
*head
= &offload_base
;
514 struct packet_offload
*po1
;
516 spin_lock(&offload_lock
);
518 list_for_each_entry(po1
, head
, list
) {
520 list_del_rcu(&po
->list
);
525 pr_warn("dev_remove_offload: %p not found\n", po
);
527 spin_unlock(&offload_lock
);
531 * dev_remove_offload - remove packet offload handler
532 * @po: packet offload declaration
534 * Remove a packet offload handler that was previously added to the kernel
535 * offload handlers by dev_add_offload(). The passed &offload_type is
536 * removed from the kernel lists and can be freed or reused once this
539 * This call sleeps to guarantee that no CPU is looking at the packet
542 void dev_remove_offload(struct packet_offload
*po
)
544 __dev_remove_offload(po
);
548 EXPORT_SYMBOL(dev_remove_offload
);
550 /******************************************************************************
552 * Device Boot-time Settings Routines
554 ******************************************************************************/
556 /* Boot time configuration table */
557 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
560 * netdev_boot_setup_add - add new setup entry
561 * @name: name of the device
562 * @map: configured settings for the device
564 * Adds new setup entry to the dev_boot_setup list. The function
565 * returns 0 on error and 1 on success. This is a generic routine to
568 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
570 struct netdev_boot_setup
*s
;
574 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
575 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
576 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
577 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
578 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
583 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
587 * netdev_boot_setup_check - check boot time settings
588 * @dev: the netdevice
590 * Check boot time settings for the device.
591 * The found settings are set for the device to be used
592 * later in the device probing.
593 * Returns 0 if no settings found, 1 if they are.
595 int netdev_boot_setup_check(struct net_device
*dev
)
597 struct netdev_boot_setup
*s
= dev_boot_setup
;
600 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
601 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
602 !strcmp(dev
->name
, s
[i
].name
)) {
603 dev
->irq
= s
[i
].map
.irq
;
604 dev
->base_addr
= s
[i
].map
.base_addr
;
605 dev
->mem_start
= s
[i
].map
.mem_start
;
606 dev
->mem_end
= s
[i
].map
.mem_end
;
612 EXPORT_SYMBOL(netdev_boot_setup_check
);
616 * netdev_boot_base - get address from boot time settings
617 * @prefix: prefix for network device
618 * @unit: id for network device
620 * Check boot time settings for the base address of device.
621 * The found settings are set for the device to be used
622 * later in the device probing.
623 * Returns 0 if no settings found.
625 unsigned long netdev_boot_base(const char *prefix
, int unit
)
627 const struct netdev_boot_setup
*s
= dev_boot_setup
;
631 sprintf(name
, "%s%d", prefix
, unit
);
634 * If device already registered then return base of 1
635 * to indicate not to probe for this interface
637 if (__dev_get_by_name(&init_net
, name
))
640 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
641 if (!strcmp(name
, s
[i
].name
))
642 return s
[i
].map
.base_addr
;
647 * Saves at boot time configured settings for any netdevice.
649 int __init
netdev_boot_setup(char *str
)
654 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
659 memset(&map
, 0, sizeof(map
));
663 map
.base_addr
= ints
[2];
665 map
.mem_start
= ints
[3];
667 map
.mem_end
= ints
[4];
669 /* Add new entry to the list */
670 return netdev_boot_setup_add(str
, &map
);
673 __setup("netdev=", netdev_boot_setup
);
675 /*******************************************************************************
677 * Device Interface Subroutines
679 *******************************************************************************/
682 * dev_get_iflink - get 'iflink' value of a interface
683 * @dev: targeted interface
685 * Indicates the ifindex the interface is linked to.
686 * Physical interfaces have the same 'ifindex' and 'iflink' values.
689 int dev_get_iflink(const struct net_device
*dev
)
691 if (dev
->netdev_ops
&& dev
->netdev_ops
->ndo_get_iflink
)
692 return dev
->netdev_ops
->ndo_get_iflink(dev
);
696 EXPORT_SYMBOL(dev_get_iflink
);
699 * dev_fill_metadata_dst - Retrieve tunnel egress information.
700 * @dev: targeted interface
703 * For better visibility of tunnel traffic OVS needs to retrieve
704 * egress tunnel information for a packet. Following API allows
705 * user to get this info.
707 int dev_fill_metadata_dst(struct net_device
*dev
, struct sk_buff
*skb
)
709 struct ip_tunnel_info
*info
;
711 if (!dev
->netdev_ops
|| !dev
->netdev_ops
->ndo_fill_metadata_dst
)
714 info
= skb_tunnel_info_unclone(skb
);
717 if (unlikely(!(info
->mode
& IP_TUNNEL_INFO_TX
)))
720 return dev
->netdev_ops
->ndo_fill_metadata_dst(dev
, skb
);
722 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst
);
725 * __dev_get_by_name - find a device by its name
726 * @net: the applicable net namespace
727 * @name: name to find
729 * Find an interface by name. Must be called under RTNL semaphore
730 * or @dev_base_lock. If the name is found a pointer to the device
731 * is returned. If the name is not found then %NULL is returned. The
732 * reference counters are not incremented so the caller must be
733 * careful with locks.
736 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
738 struct net_device
*dev
;
739 struct hlist_head
*head
= dev_name_hash(net
, name
);
741 hlist_for_each_entry(dev
, head
, name_hlist
)
742 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
747 EXPORT_SYMBOL(__dev_get_by_name
);
750 * dev_get_by_name_rcu - find a device by its name
751 * @net: the applicable net namespace
752 * @name: name to find
754 * Find an interface by name.
755 * If the name is found a pointer to the device is returned.
756 * If the name is not found then %NULL is returned.
757 * The reference counters are not incremented so the caller must be
758 * careful with locks. The caller must hold RCU lock.
761 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
763 struct net_device
*dev
;
764 struct hlist_head
*head
= dev_name_hash(net
, name
);
766 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
767 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
772 EXPORT_SYMBOL(dev_get_by_name_rcu
);
775 * dev_get_by_name - find a device by its name
776 * @net: the applicable net namespace
777 * @name: name to find
779 * Find an interface by name. This can be called from any
780 * context and does its own locking. The returned handle has
781 * the usage count incremented and the caller must use dev_put() to
782 * release it when it is no longer needed. %NULL is returned if no
783 * matching device is found.
786 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
788 struct net_device
*dev
;
791 dev
= dev_get_by_name_rcu(net
, name
);
797 EXPORT_SYMBOL(dev_get_by_name
);
800 * __dev_get_by_index - find a device by its ifindex
801 * @net: the applicable net namespace
802 * @ifindex: index of device
804 * Search for an interface by index. Returns %NULL if the device
805 * is not found or a pointer to the device. The device has not
806 * had its reference counter increased so the caller must be careful
807 * about locking. The caller must hold either the RTNL semaphore
811 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
813 struct net_device
*dev
;
814 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
816 hlist_for_each_entry(dev
, head
, index_hlist
)
817 if (dev
->ifindex
== ifindex
)
822 EXPORT_SYMBOL(__dev_get_by_index
);
825 * dev_get_by_index_rcu - find a device by its ifindex
826 * @net: the applicable net namespace
827 * @ifindex: index of device
829 * Search for an interface by index. Returns %NULL if the device
830 * is not found or a pointer to the device. The device has not
831 * had its reference counter increased so the caller must be careful
832 * about locking. The caller must hold RCU lock.
835 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
837 struct net_device
*dev
;
838 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
840 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
841 if (dev
->ifindex
== ifindex
)
846 EXPORT_SYMBOL(dev_get_by_index_rcu
);
850 * dev_get_by_index - find a device by its ifindex
851 * @net: the applicable net namespace
852 * @ifindex: index of device
854 * Search for an interface by index. Returns NULL if the device
855 * is not found or a pointer to the device. The device returned has
856 * had a reference added and the pointer is safe until the user calls
857 * dev_put to indicate they have finished with it.
860 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
862 struct net_device
*dev
;
865 dev
= dev_get_by_index_rcu(net
, ifindex
);
871 EXPORT_SYMBOL(dev_get_by_index
);
874 * dev_get_by_napi_id - find a device by napi_id
875 * @napi_id: ID of the NAPI struct
877 * Search for an interface by NAPI ID. Returns %NULL if the device
878 * is not found or a pointer to the device. The device has not had
879 * its reference counter increased so the caller must be careful
880 * about locking. The caller must hold RCU lock.
883 struct net_device
*dev_get_by_napi_id(unsigned int napi_id
)
885 struct napi_struct
*napi
;
887 WARN_ON_ONCE(!rcu_read_lock_held());
889 if (napi_id
< MIN_NAPI_ID
)
892 napi
= napi_by_id(napi_id
);
894 return napi
? napi
->dev
: NULL
;
896 EXPORT_SYMBOL(dev_get_by_napi_id
);
899 * netdev_get_name - get a netdevice name, knowing its ifindex.
900 * @net: network namespace
901 * @name: a pointer to the buffer where the name will be stored.
902 * @ifindex: the ifindex of the interface to get the name from.
904 * The use of raw_seqcount_begin() and cond_resched() before
905 * retrying is required as we want to give the writers a chance
906 * to complete when CONFIG_PREEMPT is not set.
908 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
910 struct net_device
*dev
;
914 seq
= raw_seqcount_begin(&devnet_rename_seq
);
916 dev
= dev_get_by_index_rcu(net
, ifindex
);
922 strcpy(name
, dev
->name
);
924 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
933 * dev_getbyhwaddr_rcu - find a device by its hardware address
934 * @net: the applicable net namespace
935 * @type: media type of device
936 * @ha: hardware address
938 * Search for an interface by MAC address. Returns NULL if the device
939 * is not found or a pointer to the device.
940 * The caller must hold RCU or RTNL.
941 * The returned device has not had its ref count increased
942 * and the caller must therefore be careful about locking
946 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
949 struct net_device
*dev
;
951 for_each_netdev_rcu(net
, dev
)
952 if (dev
->type
== type
&&
953 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
958 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
960 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
962 struct net_device
*dev
;
965 for_each_netdev(net
, dev
)
966 if (dev
->type
== type
)
971 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
973 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
975 struct net_device
*dev
, *ret
= NULL
;
978 for_each_netdev_rcu(net
, dev
)
979 if (dev
->type
== type
) {
987 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
990 * __dev_get_by_flags - find any device with given flags
991 * @net: the applicable net namespace
992 * @if_flags: IFF_* values
993 * @mask: bitmask of bits in if_flags to check
995 * Search for any interface with the given flags. Returns NULL if a device
996 * is not found or a pointer to the device. Must be called inside
997 * rtnl_lock(), and result refcount is unchanged.
1000 struct net_device
*__dev_get_by_flags(struct net
*net
, unsigned short if_flags
,
1001 unsigned short mask
)
1003 struct net_device
*dev
, *ret
;
1008 for_each_netdev(net
, dev
) {
1009 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
1016 EXPORT_SYMBOL(__dev_get_by_flags
);
1019 * dev_valid_name - check if name is okay for network device
1020 * @name: name string
1022 * Network device names need to be valid file names to
1023 * to allow sysfs to work. We also disallow any kind of
1026 bool dev_valid_name(const char *name
)
1030 if (strlen(name
) >= IFNAMSIZ
)
1032 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
1036 if (*name
== '/' || *name
== ':' || isspace(*name
))
1042 EXPORT_SYMBOL(dev_valid_name
);
1045 * __dev_alloc_name - allocate a name for a device
1046 * @net: network namespace to allocate the device name in
1047 * @name: name format string
1048 * @buf: scratch buffer and result name string
1050 * Passed a format string - eg "lt%d" it will try and find a suitable
1051 * id. It scans list of devices to build up a free map, then chooses
1052 * the first empty slot. The caller must hold the dev_base or rtnl lock
1053 * while allocating the name and adding the device in order to avoid
1055 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1056 * Returns the number of the unit assigned or a negative errno code.
1059 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
1063 const int max_netdevices
= 8*PAGE_SIZE
;
1064 unsigned long *inuse
;
1065 struct net_device
*d
;
1067 if (!dev_valid_name(name
))
1070 p
= strchr(name
, '%');
1073 * Verify the string as this thing may have come from
1074 * the user. There must be either one "%d" and no other "%"
1077 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
1080 /* Use one page as a bit array of possible slots */
1081 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
1085 for_each_netdev(net
, d
) {
1086 if (!sscanf(d
->name
, name
, &i
))
1088 if (i
< 0 || i
>= max_netdevices
)
1091 /* avoid cases where sscanf is not exact inverse of printf */
1092 snprintf(buf
, IFNAMSIZ
, name
, i
);
1093 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
1097 i
= find_first_zero_bit(inuse
, max_netdevices
);
1098 free_page((unsigned long) inuse
);
1101 snprintf(buf
, IFNAMSIZ
, name
, i
);
1102 if (!__dev_get_by_name(net
, buf
))
1105 /* It is possible to run out of possible slots
1106 * when the name is long and there isn't enough space left
1107 * for the digits, or if all bits are used.
1109 return p
? -ENFILE
: -EEXIST
;
1112 static int dev_alloc_name_ns(struct net
*net
,
1113 struct net_device
*dev
,
1120 ret
= __dev_alloc_name(net
, name
, buf
);
1122 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1127 * dev_alloc_name - allocate a name for a device
1129 * @name: name format string
1131 * Passed a format string - eg "lt%d" it will try and find a suitable
1132 * id. It scans list of devices to build up a free map, then chooses
1133 * the first empty slot. The caller must hold the dev_base or rtnl lock
1134 * while allocating the name and adding the device in order to avoid
1136 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1137 * Returns the number of the unit assigned or a negative errno code.
1140 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1142 return dev_alloc_name_ns(dev_net(dev
), dev
, name
);
1144 EXPORT_SYMBOL(dev_alloc_name
);
1146 int dev_get_valid_name(struct net
*net
, struct net_device
*dev
,
1149 return dev_alloc_name_ns(net
, dev
, name
);
1151 EXPORT_SYMBOL(dev_get_valid_name
);
1154 * dev_change_name - change name of a device
1156 * @newname: name (or format string) must be at least IFNAMSIZ
1158 * Change name of a device, can pass format strings "eth%d".
1161 int dev_change_name(struct net_device
*dev
, const char *newname
)
1163 unsigned char old_assign_type
;
1164 char oldname
[IFNAMSIZ
];
1170 BUG_ON(!dev_net(dev
));
1173 if (dev
->flags
& IFF_UP
)
1176 write_seqcount_begin(&devnet_rename_seq
);
1178 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1179 write_seqcount_end(&devnet_rename_seq
);
1183 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1185 err
= dev_get_valid_name(net
, dev
, newname
);
1187 write_seqcount_end(&devnet_rename_seq
);
1191 if (oldname
[0] && !strchr(oldname
, '%'))
1192 netdev_info(dev
, "renamed from %s\n", oldname
);
1194 old_assign_type
= dev
->name_assign_type
;
1195 dev
->name_assign_type
= NET_NAME_RENAMED
;
1198 ret
= device_rename(&dev
->dev
, dev
->name
);
1200 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1201 dev
->name_assign_type
= old_assign_type
;
1202 write_seqcount_end(&devnet_rename_seq
);
1206 write_seqcount_end(&devnet_rename_seq
);
1208 netdev_adjacent_rename_links(dev
, oldname
);
1210 write_lock_bh(&dev_base_lock
);
1211 hlist_del_rcu(&dev
->name_hlist
);
1212 write_unlock_bh(&dev_base_lock
);
1216 write_lock_bh(&dev_base_lock
);
1217 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1218 write_unlock_bh(&dev_base_lock
);
1220 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1221 ret
= notifier_to_errno(ret
);
1224 /* err >= 0 after dev_alloc_name() or stores the first errno */
1227 write_seqcount_begin(&devnet_rename_seq
);
1228 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1229 memcpy(oldname
, newname
, IFNAMSIZ
);
1230 dev
->name_assign_type
= old_assign_type
;
1231 old_assign_type
= NET_NAME_RENAMED
;
1234 pr_err("%s: name change rollback failed: %d\n",
1243 * dev_set_alias - change ifalias of a device
1245 * @alias: name up to IFALIASZ
1246 * @len: limit of bytes to copy from info
1248 * Set ifalias for a device,
1250 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1252 struct dev_ifalias
*new_alias
= NULL
;
1254 if (len
>= IFALIASZ
)
1258 new_alias
= kmalloc(sizeof(*new_alias
) + len
+ 1, GFP_KERNEL
);
1262 memcpy(new_alias
->ifalias
, alias
, len
);
1263 new_alias
->ifalias
[len
] = 0;
1266 mutex_lock(&ifalias_mutex
);
1267 rcu_swap_protected(dev
->ifalias
, new_alias
,
1268 mutex_is_locked(&ifalias_mutex
));
1269 mutex_unlock(&ifalias_mutex
);
1272 kfree_rcu(new_alias
, rcuhead
);
1278 * dev_get_alias - get ifalias of a device
1280 * @name: buffer to store name of ifalias
1281 * @len: size of buffer
1283 * get ifalias for a device. Caller must make sure dev cannot go
1284 * away, e.g. rcu read lock or own a reference count to device.
1286 int dev_get_alias(const struct net_device
*dev
, char *name
, size_t len
)
1288 const struct dev_ifalias
*alias
;
1292 alias
= rcu_dereference(dev
->ifalias
);
1294 ret
= snprintf(name
, len
, "%s", alias
->ifalias
);
1301 * netdev_features_change - device changes features
1302 * @dev: device to cause notification
1304 * Called to indicate a device has changed features.
1306 void netdev_features_change(struct net_device
*dev
)
1308 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1310 EXPORT_SYMBOL(netdev_features_change
);
1313 * netdev_state_change - device changes state
1314 * @dev: device to cause notification
1316 * Called to indicate a device has changed state. This function calls
1317 * the notifier chains for netdev_chain and sends a NEWLINK message
1318 * to the routing socket.
1320 void netdev_state_change(struct net_device
*dev
)
1322 if (dev
->flags
& IFF_UP
) {
1323 struct netdev_notifier_change_info change_info
= {
1327 call_netdevice_notifiers_info(NETDEV_CHANGE
,
1329 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1332 EXPORT_SYMBOL(netdev_state_change
);
1335 * netdev_notify_peers - notify network peers about existence of @dev
1336 * @dev: network device
1338 * Generate traffic such that interested network peers are aware of
1339 * @dev, such as by generating a gratuitous ARP. This may be used when
1340 * a device wants to inform the rest of the network about some sort of
1341 * reconfiguration such as a failover event or virtual machine
1344 void netdev_notify_peers(struct net_device
*dev
)
1347 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1348 call_netdevice_notifiers(NETDEV_RESEND_IGMP
, dev
);
1351 EXPORT_SYMBOL(netdev_notify_peers
);
1353 static int __dev_open(struct net_device
*dev
)
1355 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1360 if (!netif_device_present(dev
))
1363 /* Block netpoll from trying to do any rx path servicing.
1364 * If we don't do this there is a chance ndo_poll_controller
1365 * or ndo_poll may be running while we open the device
1367 netpoll_poll_disable(dev
);
1369 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1370 ret
= notifier_to_errno(ret
);
1374 set_bit(__LINK_STATE_START
, &dev
->state
);
1376 if (ops
->ndo_validate_addr
)
1377 ret
= ops
->ndo_validate_addr(dev
);
1379 if (!ret
&& ops
->ndo_open
)
1380 ret
= ops
->ndo_open(dev
);
1382 netpoll_poll_enable(dev
);
1385 clear_bit(__LINK_STATE_START
, &dev
->state
);
1387 dev
->flags
|= IFF_UP
;
1388 dev_set_rx_mode(dev
);
1390 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1397 * dev_open - prepare an interface for use.
1398 * @dev: device to open
1400 * Takes a device from down to up state. The device's private open
1401 * function is invoked and then the multicast lists are loaded. Finally
1402 * the device is moved into the up state and a %NETDEV_UP message is
1403 * sent to the netdev notifier chain.
1405 * Calling this function on an active interface is a nop. On a failure
1406 * a negative errno code is returned.
1408 int dev_open(struct net_device
*dev
)
1412 if (dev
->flags
& IFF_UP
)
1415 ret
= __dev_open(dev
);
1419 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1420 call_netdevice_notifiers(NETDEV_UP
, dev
);
1424 EXPORT_SYMBOL(dev_open
);
1426 static void __dev_close_many(struct list_head
*head
)
1428 struct net_device
*dev
;
1433 list_for_each_entry(dev
, head
, close_list
) {
1434 /* Temporarily disable netpoll until the interface is down */
1435 netpoll_poll_disable(dev
);
1437 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1439 clear_bit(__LINK_STATE_START
, &dev
->state
);
1441 /* Synchronize to scheduled poll. We cannot touch poll list, it
1442 * can be even on different cpu. So just clear netif_running().
1444 * dev->stop() will invoke napi_disable() on all of it's
1445 * napi_struct instances on this device.
1447 smp_mb__after_atomic(); /* Commit netif_running(). */
1450 dev_deactivate_many(head
);
1452 list_for_each_entry(dev
, head
, close_list
) {
1453 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1456 * Call the device specific close. This cannot fail.
1457 * Only if device is UP
1459 * We allow it to be called even after a DETACH hot-plug
1465 dev
->flags
&= ~IFF_UP
;
1466 netpoll_poll_enable(dev
);
1470 static void __dev_close(struct net_device
*dev
)
1474 list_add(&dev
->close_list
, &single
);
1475 __dev_close_many(&single
);
1479 void dev_close_many(struct list_head
*head
, bool unlink
)
1481 struct net_device
*dev
, *tmp
;
1483 /* Remove the devices that don't need to be closed */
1484 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1485 if (!(dev
->flags
& IFF_UP
))
1486 list_del_init(&dev
->close_list
);
1488 __dev_close_many(head
);
1490 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1491 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1492 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1494 list_del_init(&dev
->close_list
);
1497 EXPORT_SYMBOL(dev_close_many
);
1500 * dev_close - shutdown an interface.
1501 * @dev: device to shutdown
1503 * This function moves an active device into down state. A
1504 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1505 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1508 void dev_close(struct net_device
*dev
)
1510 if (dev
->flags
& IFF_UP
) {
1513 list_add(&dev
->close_list
, &single
);
1514 dev_close_many(&single
, true);
1518 EXPORT_SYMBOL(dev_close
);
1522 * dev_disable_lro - disable Large Receive Offload on a device
1525 * Disable Large Receive Offload (LRO) on a net device. Must be
1526 * called under RTNL. This is needed if received packets may be
1527 * forwarded to another interface.
1529 void dev_disable_lro(struct net_device
*dev
)
1531 struct net_device
*lower_dev
;
1532 struct list_head
*iter
;
1534 dev
->wanted_features
&= ~NETIF_F_LRO
;
1535 netdev_update_features(dev
);
1537 if (unlikely(dev
->features
& NETIF_F_LRO
))
1538 netdev_WARN(dev
, "failed to disable LRO!\n");
1540 netdev_for_each_lower_dev(dev
, lower_dev
, iter
)
1541 dev_disable_lro(lower_dev
);
1543 EXPORT_SYMBOL(dev_disable_lro
);
1545 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1546 struct net_device
*dev
)
1548 struct netdev_notifier_info info
= {
1552 return nb
->notifier_call(nb
, val
, &info
);
1555 static int dev_boot_phase
= 1;
1558 * register_netdevice_notifier - register a network notifier block
1561 * Register a notifier to be called when network device events occur.
1562 * The notifier passed is linked into the kernel structures and must
1563 * not be reused until it has been unregistered. A negative errno code
1564 * is returned on a failure.
1566 * When registered all registration and up events are replayed
1567 * to the new notifier to allow device to have a race free
1568 * view of the network device list.
1571 int register_netdevice_notifier(struct notifier_block
*nb
)
1573 struct net_device
*dev
;
1574 struct net_device
*last
;
1579 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1585 for_each_netdev(net
, dev
) {
1586 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1587 err
= notifier_to_errno(err
);
1591 if (!(dev
->flags
& IFF_UP
))
1594 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1605 for_each_netdev(net
, dev
) {
1609 if (dev
->flags
& IFF_UP
) {
1610 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1612 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1614 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1619 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1622 EXPORT_SYMBOL(register_netdevice_notifier
);
1625 * unregister_netdevice_notifier - unregister a network notifier block
1628 * Unregister a notifier previously registered by
1629 * register_netdevice_notifier(). The notifier is unlinked into the
1630 * kernel structures and may then be reused. A negative errno code
1631 * is returned on a failure.
1633 * After unregistering unregister and down device events are synthesized
1634 * for all devices on the device list to the removed notifier to remove
1635 * the need for special case cleanup code.
1638 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1640 struct net_device
*dev
;
1645 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1650 for_each_netdev(net
, dev
) {
1651 if (dev
->flags
& IFF_UP
) {
1652 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1654 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1656 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1663 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1666 * call_netdevice_notifiers_info - call all network notifier blocks
1667 * @val: value passed unmodified to notifier function
1668 * @dev: net_device pointer passed unmodified to notifier function
1669 * @info: notifier information data
1671 * Call all network notifier blocks. Parameters and return value
1672 * are as for raw_notifier_call_chain().
1675 static int call_netdevice_notifiers_info(unsigned long val
,
1676 struct netdev_notifier_info
*info
)
1679 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1683 * call_netdevice_notifiers - call all network notifier blocks
1684 * @val: value passed unmodified to notifier function
1685 * @dev: net_device pointer passed unmodified to notifier function
1687 * Call all network notifier blocks. Parameters and return value
1688 * are as for raw_notifier_call_chain().
1691 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1693 struct netdev_notifier_info info
= {
1697 return call_netdevice_notifiers_info(val
, &info
);
1699 EXPORT_SYMBOL(call_netdevice_notifiers
);
1701 #ifdef CONFIG_NET_INGRESS
1702 static struct static_key ingress_needed __read_mostly
;
1704 void net_inc_ingress_queue(void)
1706 static_key_slow_inc(&ingress_needed
);
1708 EXPORT_SYMBOL_GPL(net_inc_ingress_queue
);
1710 void net_dec_ingress_queue(void)
1712 static_key_slow_dec(&ingress_needed
);
1714 EXPORT_SYMBOL_GPL(net_dec_ingress_queue
);
1717 #ifdef CONFIG_NET_EGRESS
1718 static struct static_key egress_needed __read_mostly
;
1720 void net_inc_egress_queue(void)
1722 static_key_slow_inc(&egress_needed
);
1724 EXPORT_SYMBOL_GPL(net_inc_egress_queue
);
1726 void net_dec_egress_queue(void)
1728 static_key_slow_dec(&egress_needed
);
1730 EXPORT_SYMBOL_GPL(net_dec_egress_queue
);
1733 static struct static_key netstamp_needed __read_mostly
;
1734 #ifdef HAVE_JUMP_LABEL
1735 static atomic_t netstamp_needed_deferred
;
1736 static atomic_t netstamp_wanted
;
1737 static void netstamp_clear(struct work_struct
*work
)
1739 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1742 wanted
= atomic_add_return(deferred
, &netstamp_wanted
);
1744 static_key_enable(&netstamp_needed
);
1746 static_key_disable(&netstamp_needed
);
1748 static DECLARE_WORK(netstamp_work
, netstamp_clear
);
1751 void net_enable_timestamp(void)
1753 #ifdef HAVE_JUMP_LABEL
1757 wanted
= atomic_read(&netstamp_wanted
);
1760 if (atomic_cmpxchg(&netstamp_wanted
, wanted
, wanted
+ 1) == wanted
)
1763 atomic_inc(&netstamp_needed_deferred
);
1764 schedule_work(&netstamp_work
);
1766 static_key_slow_inc(&netstamp_needed
);
1769 EXPORT_SYMBOL(net_enable_timestamp
);
1771 void net_disable_timestamp(void)
1773 #ifdef HAVE_JUMP_LABEL
1777 wanted
= atomic_read(&netstamp_wanted
);
1780 if (atomic_cmpxchg(&netstamp_wanted
, wanted
, wanted
- 1) == wanted
)
1783 atomic_dec(&netstamp_needed_deferred
);
1784 schedule_work(&netstamp_work
);
1786 static_key_slow_dec(&netstamp_needed
);
1789 EXPORT_SYMBOL(net_disable_timestamp
);
1791 static inline void net_timestamp_set(struct sk_buff
*skb
)
1794 if (static_key_false(&netstamp_needed
))
1795 __net_timestamp(skb
);
1798 #define net_timestamp_check(COND, SKB) \
1799 if (static_key_false(&netstamp_needed)) { \
1800 if ((COND) && !(SKB)->tstamp) \
1801 __net_timestamp(SKB); \
1804 bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb)
1808 if (!(dev
->flags
& IFF_UP
))
1811 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1812 if (skb
->len
<= len
)
1815 /* if TSO is enabled, we don't care about the length as the packet
1816 * could be forwarded without being segmented before
1818 if (skb_is_gso(skb
))
1823 EXPORT_SYMBOL_GPL(is_skb_forwardable
);
1825 int __dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1827 int ret
= ____dev_forward_skb(dev
, skb
);
1830 skb
->protocol
= eth_type_trans(skb
, dev
);
1831 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
1836 EXPORT_SYMBOL_GPL(__dev_forward_skb
);
1839 * dev_forward_skb - loopback an skb to another netif
1841 * @dev: destination network device
1842 * @skb: buffer to forward
1845 * NET_RX_SUCCESS (no congestion)
1846 * NET_RX_DROP (packet was dropped, but freed)
1848 * dev_forward_skb can be used for injecting an skb from the
1849 * start_xmit function of one device into the receive queue
1850 * of another device.
1852 * The receiving device may be in another namespace, so
1853 * we have to clear all information in the skb that could
1854 * impact namespace isolation.
1856 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1858 return __dev_forward_skb(dev
, skb
) ?: netif_rx_internal(skb
);
1860 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1862 static inline int deliver_skb(struct sk_buff
*skb
,
1863 struct packet_type
*pt_prev
,
1864 struct net_device
*orig_dev
)
1866 if (unlikely(skb_orphan_frags_rx(skb
, GFP_ATOMIC
)))
1868 refcount_inc(&skb
->users
);
1869 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1872 static inline void deliver_ptype_list_skb(struct sk_buff
*skb
,
1873 struct packet_type
**pt
,
1874 struct net_device
*orig_dev
,
1876 struct list_head
*ptype_list
)
1878 struct packet_type
*ptype
, *pt_prev
= *pt
;
1880 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1881 if (ptype
->type
!= type
)
1884 deliver_skb(skb
, pt_prev
, orig_dev
);
1890 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1892 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1895 if (ptype
->id_match
)
1896 return ptype
->id_match(ptype
, skb
->sk
);
1897 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1904 * Support routine. Sends outgoing frames to any network
1905 * taps currently in use.
1908 void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1910 struct packet_type
*ptype
;
1911 struct sk_buff
*skb2
= NULL
;
1912 struct packet_type
*pt_prev
= NULL
;
1913 struct list_head
*ptype_list
= &ptype_all
;
1917 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1918 /* Never send packets back to the socket
1919 * they originated from - MvS (miquels@drinkel.ow.org)
1921 if (skb_loop_sk(ptype
, skb
))
1925 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1930 /* need to clone skb, done only once */
1931 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1935 net_timestamp_set(skb2
);
1937 /* skb->nh should be correctly
1938 * set by sender, so that the second statement is
1939 * just protection against buggy protocols.
1941 skb_reset_mac_header(skb2
);
1943 if (skb_network_header(skb2
) < skb2
->data
||
1944 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1945 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1946 ntohs(skb2
->protocol
),
1948 skb_reset_network_header(skb2
);
1951 skb2
->transport_header
= skb2
->network_header
;
1952 skb2
->pkt_type
= PACKET_OUTGOING
;
1956 if (ptype_list
== &ptype_all
) {
1957 ptype_list
= &dev
->ptype_all
;
1962 if (!skb_orphan_frags_rx(skb2
, GFP_ATOMIC
))
1963 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1969 EXPORT_SYMBOL_GPL(dev_queue_xmit_nit
);
1972 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1973 * @dev: Network device
1974 * @txq: number of queues available
1976 * If real_num_tx_queues is changed the tc mappings may no longer be
1977 * valid. To resolve this verify the tc mapping remains valid and if
1978 * not NULL the mapping. With no priorities mapping to this
1979 * offset/count pair it will no longer be used. In the worst case TC0
1980 * is invalid nothing can be done so disable priority mappings. If is
1981 * expected that drivers will fix this mapping if they can before
1982 * calling netif_set_real_num_tx_queues.
1984 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1987 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1989 /* If TC0 is invalidated disable TC mapping */
1990 if (tc
->offset
+ tc
->count
> txq
) {
1991 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1996 /* Invalidated prio to tc mappings set to TC0 */
1997 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1998 int q
= netdev_get_prio_tc_map(dev
, i
);
2000 tc
= &dev
->tc_to_txq
[q
];
2001 if (tc
->offset
+ tc
->count
> txq
) {
2002 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
2004 netdev_set_prio_tc_map(dev
, i
, 0);
2009 int netdev_txq_to_tc(struct net_device
*dev
, unsigned int txq
)
2012 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
2015 for (i
= 0; i
< TC_MAX_QUEUE
; i
++, tc
++) {
2016 if ((txq
- tc
->offset
) < tc
->count
)
2025 EXPORT_SYMBOL(netdev_txq_to_tc
);
2028 static DEFINE_MUTEX(xps_map_mutex
);
2029 #define xmap_dereference(P) \
2030 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
2032 static bool remove_xps_queue(struct xps_dev_maps
*dev_maps
,
2035 struct xps_map
*map
= NULL
;
2039 map
= xmap_dereference(dev_maps
->cpu_map
[tci
]);
2043 for (pos
= map
->len
; pos
--;) {
2044 if (map
->queues
[pos
] != index
)
2048 map
->queues
[pos
] = map
->queues
[--map
->len
];
2052 RCU_INIT_POINTER(dev_maps
->cpu_map
[tci
], NULL
);
2053 kfree_rcu(map
, rcu
);
2060 static bool remove_xps_queue_cpu(struct net_device
*dev
,
2061 struct xps_dev_maps
*dev_maps
,
2062 int cpu
, u16 offset
, u16 count
)
2064 int num_tc
= dev
->num_tc
? : 1;
2065 bool active
= false;
2068 for (tci
= cpu
* num_tc
; num_tc
--; tci
++) {
2071 for (i
= count
, j
= offset
; i
--; j
++) {
2072 if (!remove_xps_queue(dev_maps
, cpu
, j
))
2082 static void netif_reset_xps_queues(struct net_device
*dev
, u16 offset
,
2085 struct xps_dev_maps
*dev_maps
;
2087 bool active
= false;
2089 mutex_lock(&xps_map_mutex
);
2090 dev_maps
= xmap_dereference(dev
->xps_maps
);
2095 for_each_possible_cpu(cpu
)
2096 active
|= remove_xps_queue_cpu(dev
, dev_maps
, cpu
,
2100 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2101 kfree_rcu(dev_maps
, rcu
);
2104 for (i
= offset
+ (count
- 1); count
--; i
--)
2105 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
2109 mutex_unlock(&xps_map_mutex
);
2112 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
2114 netif_reset_xps_queues(dev
, index
, dev
->num_tx_queues
- index
);
2117 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
2120 struct xps_map
*new_map
;
2121 int alloc_len
= XPS_MIN_MAP_ALLOC
;
2124 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
2125 if (map
->queues
[pos
] != index
)
2130 /* Need to add queue to this CPU's existing map */
2132 if (pos
< map
->alloc_len
)
2135 alloc_len
= map
->alloc_len
* 2;
2138 /* Need to allocate new map to store queue on this CPU's map */
2139 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
2144 for (i
= 0; i
< pos
; i
++)
2145 new_map
->queues
[i
] = map
->queues
[i
];
2146 new_map
->alloc_len
= alloc_len
;
2152 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
2155 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
2156 int i
, cpu
, tci
, numa_node_id
= -2;
2157 int maps_sz
, num_tc
= 1, tc
= 0;
2158 struct xps_map
*map
, *new_map
;
2159 bool active
= false;
2162 num_tc
= dev
->num_tc
;
2163 tc
= netdev_txq_to_tc(dev
, index
);
2168 maps_sz
= XPS_DEV_MAPS_SIZE(num_tc
);
2169 if (maps_sz
< L1_CACHE_BYTES
)
2170 maps_sz
= L1_CACHE_BYTES
;
2172 mutex_lock(&xps_map_mutex
);
2174 dev_maps
= xmap_dereference(dev
->xps_maps
);
2176 /* allocate memory for queue storage */
2177 for_each_cpu_and(cpu
, cpu_online_mask
, mask
) {
2179 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
2180 if (!new_dev_maps
) {
2181 mutex_unlock(&xps_map_mutex
);
2185 tci
= cpu
* num_tc
+ tc
;
2186 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[tci
]) :
2189 map
= expand_xps_map(map
, cpu
, index
);
2193 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[tci
], map
);
2197 goto out_no_new_maps
;
2199 for_each_possible_cpu(cpu
) {
2200 /* copy maps belonging to foreign traffic classes */
2201 for (i
= tc
, tci
= cpu
* num_tc
; dev_maps
&& i
--; tci
++) {
2202 /* fill in the new device map from the old device map */
2203 map
= xmap_dereference(dev_maps
->cpu_map
[tci
]);
2204 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[tci
], map
);
2207 /* We need to explicitly update tci as prevous loop
2208 * could break out early if dev_maps is NULL.
2210 tci
= cpu
* num_tc
+ tc
;
2212 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
2213 /* add queue to CPU maps */
2216 map
= xmap_dereference(new_dev_maps
->cpu_map
[tci
]);
2217 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
2220 if (pos
== map
->len
)
2221 map
->queues
[map
->len
++] = index
;
2223 if (numa_node_id
== -2)
2224 numa_node_id
= cpu_to_node(cpu
);
2225 else if (numa_node_id
!= cpu_to_node(cpu
))
2228 } else if (dev_maps
) {
2229 /* fill in the new device map from the old device map */
2230 map
= xmap_dereference(dev_maps
->cpu_map
[tci
]);
2231 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[tci
], map
);
2234 /* copy maps belonging to foreign traffic classes */
2235 for (i
= num_tc
- tc
, tci
++; dev_maps
&& --i
; tci
++) {
2236 /* fill in the new device map from the old device map */
2237 map
= xmap_dereference(dev_maps
->cpu_map
[tci
]);
2238 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[tci
], map
);
2242 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
2244 /* Cleanup old maps */
2246 goto out_no_old_maps
;
2248 for_each_possible_cpu(cpu
) {
2249 for (i
= num_tc
, tci
= cpu
* num_tc
; i
--; tci
++) {
2250 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[tci
]);
2251 map
= xmap_dereference(dev_maps
->cpu_map
[tci
]);
2252 if (map
&& map
!= new_map
)
2253 kfree_rcu(map
, rcu
);
2257 kfree_rcu(dev_maps
, rcu
);
2260 dev_maps
= new_dev_maps
;
2264 /* update Tx queue numa node */
2265 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2266 (numa_node_id
>= 0) ? numa_node_id
:
2272 /* removes queue from unused CPUs */
2273 for_each_possible_cpu(cpu
) {
2274 for (i
= tc
, tci
= cpu
* num_tc
; i
--; tci
++)
2275 active
|= remove_xps_queue(dev_maps
, tci
, index
);
2276 if (!cpumask_test_cpu(cpu
, mask
) || !cpu_online(cpu
))
2277 active
|= remove_xps_queue(dev_maps
, tci
, index
);
2278 for (i
= num_tc
- tc
, tci
++; --i
; tci
++)
2279 active
|= remove_xps_queue(dev_maps
, tci
, index
);
2282 /* free map if not active */
2284 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2285 kfree_rcu(dev_maps
, rcu
);
2289 mutex_unlock(&xps_map_mutex
);
2293 /* remove any maps that we added */
2294 for_each_possible_cpu(cpu
) {
2295 for (i
= num_tc
, tci
= cpu
* num_tc
; i
--; tci
++) {
2296 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[tci
]);
2298 xmap_dereference(dev_maps
->cpu_map
[tci
]) :
2300 if (new_map
&& new_map
!= map
)
2305 mutex_unlock(&xps_map_mutex
);
2307 kfree(new_dev_maps
);
2310 EXPORT_SYMBOL(netif_set_xps_queue
);
2313 void netdev_reset_tc(struct net_device
*dev
)
2316 netif_reset_xps_queues_gt(dev
, 0);
2319 memset(dev
->tc_to_txq
, 0, sizeof(dev
->tc_to_txq
));
2320 memset(dev
->prio_tc_map
, 0, sizeof(dev
->prio_tc_map
));
2322 EXPORT_SYMBOL(netdev_reset_tc
);
2324 int netdev_set_tc_queue(struct net_device
*dev
, u8 tc
, u16 count
, u16 offset
)
2326 if (tc
>= dev
->num_tc
)
2330 netif_reset_xps_queues(dev
, offset
, count
);
2332 dev
->tc_to_txq
[tc
].count
= count
;
2333 dev
->tc_to_txq
[tc
].offset
= offset
;
2336 EXPORT_SYMBOL(netdev_set_tc_queue
);
2338 int netdev_set_num_tc(struct net_device
*dev
, u8 num_tc
)
2340 if (num_tc
> TC_MAX_QUEUE
)
2344 netif_reset_xps_queues_gt(dev
, 0);
2346 dev
->num_tc
= num_tc
;
2349 EXPORT_SYMBOL(netdev_set_num_tc
);
2352 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2353 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2355 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2359 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2362 if (dev
->reg_state
== NETREG_REGISTERED
||
2363 dev
->reg_state
== NETREG_UNREGISTERING
) {
2366 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2372 netif_setup_tc(dev
, txq
);
2374 if (txq
< dev
->real_num_tx_queues
) {
2375 qdisc_reset_all_tx_gt(dev
, txq
);
2377 netif_reset_xps_queues_gt(dev
, txq
);
2382 dev
->real_num_tx_queues
= txq
;
2385 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2389 * netif_set_real_num_rx_queues - set actual number of RX queues used
2390 * @dev: Network device
2391 * @rxq: Actual number of RX queues
2393 * This must be called either with the rtnl_lock held or before
2394 * registration of the net device. Returns 0 on success, or a
2395 * negative error code. If called before registration, it always
2398 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2402 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2405 if (dev
->reg_state
== NETREG_REGISTERED
) {
2408 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2414 dev
->real_num_rx_queues
= rxq
;
2417 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2421 * netif_get_num_default_rss_queues - default number of RSS queues
2423 * This routine should set an upper limit on the number of RSS queues
2424 * used by default by multiqueue devices.
2426 int netif_get_num_default_rss_queues(void)
2428 return is_kdump_kernel() ?
2429 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2431 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2433 static void __netif_reschedule(struct Qdisc
*q
)
2435 struct softnet_data
*sd
;
2436 unsigned long flags
;
2438 local_irq_save(flags
);
2439 sd
= this_cpu_ptr(&softnet_data
);
2440 q
->next_sched
= NULL
;
2441 *sd
->output_queue_tailp
= q
;
2442 sd
->output_queue_tailp
= &q
->next_sched
;
2443 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2444 local_irq_restore(flags
);
2447 void __netif_schedule(struct Qdisc
*q
)
2449 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2450 __netif_reschedule(q
);
2452 EXPORT_SYMBOL(__netif_schedule
);
2454 struct dev_kfree_skb_cb
{
2455 enum skb_free_reason reason
;
2458 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2460 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2463 void netif_schedule_queue(struct netdev_queue
*txq
)
2466 if (!(txq
->state
& QUEUE_STATE_ANY_XOFF
)) {
2467 struct Qdisc
*q
= rcu_dereference(txq
->qdisc
);
2469 __netif_schedule(q
);
2473 EXPORT_SYMBOL(netif_schedule_queue
);
2475 void netif_tx_wake_queue(struct netdev_queue
*dev_queue
)
2477 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &dev_queue
->state
)) {
2481 q
= rcu_dereference(dev_queue
->qdisc
);
2482 __netif_schedule(q
);
2486 EXPORT_SYMBOL(netif_tx_wake_queue
);
2488 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2490 unsigned long flags
;
2495 if (likely(refcount_read(&skb
->users
) == 1)) {
2497 refcount_set(&skb
->users
, 0);
2498 } else if (likely(!refcount_dec_and_test(&skb
->users
))) {
2501 get_kfree_skb_cb(skb
)->reason
= reason
;
2502 local_irq_save(flags
);
2503 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2504 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2505 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2506 local_irq_restore(flags
);
2508 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2510 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2512 if (in_irq() || irqs_disabled())
2513 __dev_kfree_skb_irq(skb
, reason
);
2517 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2521 * netif_device_detach - mark device as removed
2522 * @dev: network device
2524 * Mark device as removed from system and therefore no longer available.
2526 void netif_device_detach(struct net_device
*dev
)
2528 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2529 netif_running(dev
)) {
2530 netif_tx_stop_all_queues(dev
);
2533 EXPORT_SYMBOL(netif_device_detach
);
2536 * netif_device_attach - mark device as attached
2537 * @dev: network device
2539 * Mark device as attached from system and restart if needed.
2541 void netif_device_attach(struct net_device
*dev
)
2543 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2544 netif_running(dev
)) {
2545 netif_tx_wake_all_queues(dev
);
2546 __netdev_watchdog_up(dev
);
2549 EXPORT_SYMBOL(netif_device_attach
);
2552 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2553 * to be used as a distribution range.
2555 u16
__skb_tx_hash(const struct net_device
*dev
, struct sk_buff
*skb
,
2556 unsigned int num_tx_queues
)
2560 u16 qcount
= num_tx_queues
;
2562 if (skb_rx_queue_recorded(skb
)) {
2563 hash
= skb_get_rx_queue(skb
);
2564 while (unlikely(hash
>= num_tx_queues
))
2565 hash
-= num_tx_queues
;
2570 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2572 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2573 qcount
= dev
->tc_to_txq
[tc
].count
;
2576 return (u16
) reciprocal_scale(skb_get_hash(skb
), qcount
) + qoffset
;
2578 EXPORT_SYMBOL(__skb_tx_hash
);
2580 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2582 static const netdev_features_t null_features
;
2583 struct net_device
*dev
= skb
->dev
;
2584 const char *name
= "";
2586 if (!net_ratelimit())
2590 if (dev
->dev
.parent
)
2591 name
= dev_driver_string(dev
->dev
.parent
);
2593 name
= netdev_name(dev
);
2595 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2596 "gso_type=%d ip_summed=%d\n",
2597 name
, dev
? &dev
->features
: &null_features
,
2598 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2599 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2600 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2604 * Invalidate hardware checksum when packet is to be mangled, and
2605 * complete checksum manually on outgoing path.
2607 int skb_checksum_help(struct sk_buff
*skb
)
2610 int ret
= 0, offset
;
2612 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2613 goto out_set_summed
;
2615 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2616 skb_warn_bad_offload(skb
);
2620 /* Before computing a checksum, we should make sure no frag could
2621 * be modified by an external entity : checksum could be wrong.
2623 if (skb_has_shared_frag(skb
)) {
2624 ret
= __skb_linearize(skb
);
2629 offset
= skb_checksum_start_offset(skb
);
2630 BUG_ON(offset
>= skb_headlen(skb
));
2631 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2633 offset
+= skb
->csum_offset
;
2634 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2636 if (skb_cloned(skb
) &&
2637 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2638 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2643 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
) ?: CSUM_MANGLED_0
;
2645 skb
->ip_summed
= CHECKSUM_NONE
;
2649 EXPORT_SYMBOL(skb_checksum_help
);
2651 int skb_crc32c_csum_help(struct sk_buff
*skb
)
2654 int ret
= 0, offset
, start
;
2656 if (skb
->ip_summed
!= CHECKSUM_PARTIAL
)
2659 if (unlikely(skb_is_gso(skb
)))
2662 /* Before computing a checksum, we should make sure no frag could
2663 * be modified by an external entity : checksum could be wrong.
2665 if (unlikely(skb_has_shared_frag(skb
))) {
2666 ret
= __skb_linearize(skb
);
2670 start
= skb_checksum_start_offset(skb
);
2671 offset
= start
+ offsetof(struct sctphdr
, checksum
);
2672 if (WARN_ON_ONCE(offset
>= skb_headlen(skb
))) {
2676 if (skb_cloned(skb
) &&
2677 !skb_clone_writable(skb
, offset
+ sizeof(__le32
))) {
2678 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2682 crc32c_csum
= cpu_to_le32(~__skb_checksum(skb
, start
,
2683 skb
->len
- start
, ~(__u32
)0,
2685 *(__le32
*)(skb
->data
+ offset
) = crc32c_csum
;
2686 skb
->ip_summed
= CHECKSUM_NONE
;
2687 skb
->csum_not_inet
= 0;
2692 __be16
skb_network_protocol(struct sk_buff
*skb
, int *depth
)
2694 __be16 type
= skb
->protocol
;
2696 /* Tunnel gso handlers can set protocol to ethernet. */
2697 if (type
== htons(ETH_P_TEB
)) {
2700 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2703 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2704 type
= eth
->h_proto
;
2707 return __vlan_get_protocol(skb
, type
, depth
);
2711 * skb_mac_gso_segment - mac layer segmentation handler.
2712 * @skb: buffer to segment
2713 * @features: features for the output path (see dev->features)
2715 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2716 netdev_features_t features
)
2718 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2719 struct packet_offload
*ptype
;
2720 int vlan_depth
= skb
->mac_len
;
2721 __be16 type
= skb_network_protocol(skb
, &vlan_depth
);
2723 if (unlikely(!type
))
2724 return ERR_PTR(-EINVAL
);
2726 __skb_pull(skb
, vlan_depth
);
2729 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2730 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2731 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2737 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2741 EXPORT_SYMBOL(skb_mac_gso_segment
);
2744 /* openvswitch calls this on rx path, so we need a different check.
2746 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2749 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2751 return skb
->ip_summed
== CHECKSUM_NONE
;
2755 * __skb_gso_segment - Perform segmentation on skb.
2756 * @skb: buffer to segment
2757 * @features: features for the output path (see dev->features)
2758 * @tx_path: whether it is called in TX path
2760 * This function segments the given skb and returns a list of segments.
2762 * It may return NULL if the skb requires no segmentation. This is
2763 * only possible when GSO is used for verifying header integrity.
2765 * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb.
2767 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2768 netdev_features_t features
, bool tx_path
)
2770 struct sk_buff
*segs
;
2772 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2775 /* We're going to init ->check field in TCP or UDP header */
2776 err
= skb_cow_head(skb
, 0);
2778 return ERR_PTR(err
);
2781 /* Only report GSO partial support if it will enable us to
2782 * support segmentation on this frame without needing additional
2785 if (features
& NETIF_F_GSO_PARTIAL
) {
2786 netdev_features_t partial_features
= NETIF_F_GSO_ROBUST
;
2787 struct net_device
*dev
= skb
->dev
;
2789 partial_features
|= dev
->features
& dev
->gso_partial_features
;
2790 if (!skb_gso_ok(skb
, features
| partial_features
))
2791 features
&= ~NETIF_F_GSO_PARTIAL
;
2794 BUILD_BUG_ON(SKB_SGO_CB_OFFSET
+
2795 sizeof(*SKB_GSO_CB(skb
)) > sizeof(skb
->cb
));
2797 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2798 SKB_GSO_CB(skb
)->encap_level
= 0;
2800 skb_reset_mac_header(skb
);
2801 skb_reset_mac_len(skb
);
2803 segs
= skb_mac_gso_segment(skb
, features
);
2805 if (unlikely(skb_needs_check(skb
, tx_path
)))
2806 skb_warn_bad_offload(skb
);
2810 EXPORT_SYMBOL(__skb_gso_segment
);
2812 /* Take action when hardware reception checksum errors are detected. */
2814 void netdev_rx_csum_fault(struct net_device
*dev
)
2816 if (net_ratelimit()) {
2817 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2821 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2824 /* Actually, we should eliminate this check as soon as we know, that:
2825 * 1. IOMMU is present and allows to map all the memory.
2826 * 2. No high memory really exists on this machine.
2829 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2831 #ifdef CONFIG_HIGHMEM
2834 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2835 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2836 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2838 if (PageHighMem(skb_frag_page(frag
)))
2843 if (PCI_DMA_BUS_IS_PHYS
) {
2844 struct device
*pdev
= dev
->dev
.parent
;
2848 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2849 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2850 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2852 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2860 /* If MPLS offload request, verify we are testing hardware MPLS features
2861 * instead of standard features for the netdev.
2863 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2864 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2865 netdev_features_t features
,
2868 if (eth_p_mpls(type
))
2869 features
&= skb
->dev
->mpls_features
;
2874 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2875 netdev_features_t features
,
2882 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2883 netdev_features_t features
)
2888 type
= skb_network_protocol(skb
, &tmp
);
2889 features
= net_mpls_features(skb
, features
, type
);
2891 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2892 !can_checksum_protocol(features
, type
)) {
2893 features
&= ~(NETIF_F_CSUM_MASK
| NETIF_F_GSO_MASK
);
2895 if (illegal_highdma(skb
->dev
, skb
))
2896 features
&= ~NETIF_F_SG
;
2901 netdev_features_t
passthru_features_check(struct sk_buff
*skb
,
2902 struct net_device
*dev
,
2903 netdev_features_t features
)
2907 EXPORT_SYMBOL(passthru_features_check
);
2909 static netdev_features_t
dflt_features_check(const struct sk_buff
*skb
,
2910 struct net_device
*dev
,
2911 netdev_features_t features
)
2913 return vlan_features_check(skb
, features
);
2916 static netdev_features_t
gso_features_check(const struct sk_buff
*skb
,
2917 struct net_device
*dev
,
2918 netdev_features_t features
)
2920 u16 gso_segs
= skb_shinfo(skb
)->gso_segs
;
2922 if (gso_segs
> dev
->gso_max_segs
)
2923 return features
& ~NETIF_F_GSO_MASK
;
2925 /* Support for GSO partial features requires software
2926 * intervention before we can actually process the packets
2927 * so we need to strip support for any partial features now
2928 * and we can pull them back in after we have partially
2929 * segmented the frame.
2931 if (!(skb_shinfo(skb
)->gso_type
& SKB_GSO_PARTIAL
))
2932 features
&= ~dev
->gso_partial_features
;
2934 /* Make sure to clear the IPv4 ID mangling feature if the
2935 * IPv4 header has the potential to be fragmented.
2937 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
) {
2938 struct iphdr
*iph
= skb
->encapsulation
?
2939 inner_ip_hdr(skb
) : ip_hdr(skb
);
2941 if (!(iph
->frag_off
& htons(IP_DF
)))
2942 features
&= ~NETIF_F_TSO_MANGLEID
;
2948 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2950 struct net_device
*dev
= skb
->dev
;
2951 netdev_features_t features
= dev
->features
;
2953 if (skb_is_gso(skb
))
2954 features
= gso_features_check(skb
, dev
, features
);
2956 /* If encapsulation offload request, verify we are testing
2957 * hardware encapsulation features instead of standard
2958 * features for the netdev
2960 if (skb
->encapsulation
)
2961 features
&= dev
->hw_enc_features
;
2963 if (skb_vlan_tagged(skb
))
2964 features
= netdev_intersect_features(features
,
2965 dev
->vlan_features
|
2966 NETIF_F_HW_VLAN_CTAG_TX
|
2967 NETIF_F_HW_VLAN_STAG_TX
);
2969 if (dev
->netdev_ops
->ndo_features_check
)
2970 features
&= dev
->netdev_ops
->ndo_features_check(skb
, dev
,
2973 features
&= dflt_features_check(skb
, dev
, features
);
2975 return harmonize_features(skb
, features
);
2977 EXPORT_SYMBOL(netif_skb_features
);
2979 static int xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
2980 struct netdev_queue
*txq
, bool more
)
2985 if (!list_empty(&ptype_all
) || !list_empty(&dev
->ptype_all
))
2986 dev_queue_xmit_nit(skb
, dev
);
2989 trace_net_dev_start_xmit(skb
, dev
);
2990 rc
= netdev_start_xmit(skb
, dev
, txq
, more
);
2991 trace_net_dev_xmit(skb
, rc
, dev
, len
);
2996 struct sk_buff
*dev_hard_start_xmit(struct sk_buff
*first
, struct net_device
*dev
,
2997 struct netdev_queue
*txq
, int *ret
)
2999 struct sk_buff
*skb
= first
;
3000 int rc
= NETDEV_TX_OK
;
3003 struct sk_buff
*next
= skb
->next
;
3006 rc
= xmit_one(skb
, dev
, txq
, next
!= NULL
);
3007 if (unlikely(!dev_xmit_complete(rc
))) {
3013 if (netif_xmit_stopped(txq
) && skb
) {
3014 rc
= NETDEV_TX_BUSY
;
3024 static struct sk_buff
*validate_xmit_vlan(struct sk_buff
*skb
,
3025 netdev_features_t features
)
3027 if (skb_vlan_tag_present(skb
) &&
3028 !vlan_hw_offload_capable(features
, skb
->vlan_proto
))
3029 skb
= __vlan_hwaccel_push_inside(skb
);
3033 int skb_csum_hwoffload_help(struct sk_buff
*skb
,
3034 const netdev_features_t features
)
3036 if (unlikely(skb
->csum_not_inet
))
3037 return !!(features
& NETIF_F_SCTP_CRC
) ? 0 :
3038 skb_crc32c_csum_help(skb
);
3040 return !!(features
& NETIF_F_CSUM_MASK
) ? 0 : skb_checksum_help(skb
);
3042 EXPORT_SYMBOL(skb_csum_hwoffload_help
);
3044 static struct sk_buff
*validate_xmit_skb(struct sk_buff
*skb
, struct net_device
*dev
)
3046 netdev_features_t features
;
3048 features
= netif_skb_features(skb
);
3049 skb
= validate_xmit_vlan(skb
, features
);
3053 if (netif_needs_gso(skb
, features
)) {
3054 struct sk_buff
*segs
;
3056 segs
= skb_gso_segment(skb
, features
);
3064 if (skb_needs_linearize(skb
, features
) &&
3065 __skb_linearize(skb
))
3068 if (validate_xmit_xfrm(skb
, features
))
3071 /* If packet is not checksummed and device does not
3072 * support checksumming for this protocol, complete
3073 * checksumming here.
3075 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
3076 if (skb
->encapsulation
)
3077 skb_set_inner_transport_header(skb
,
3078 skb_checksum_start_offset(skb
));
3080 skb_set_transport_header(skb
,
3081 skb_checksum_start_offset(skb
));
3082 if (skb_csum_hwoffload_help(skb
, features
))
3092 atomic_long_inc(&dev
->tx_dropped
);
3096 struct sk_buff
*validate_xmit_skb_list(struct sk_buff
*skb
, struct net_device
*dev
)
3098 struct sk_buff
*next
, *head
= NULL
, *tail
;
3100 for (; skb
!= NULL
; skb
= next
) {
3104 /* in case skb wont be segmented, point to itself */
3107 skb
= validate_xmit_skb(skb
, dev
);
3115 /* If skb was segmented, skb->prev points to
3116 * the last segment. If not, it still contains skb.
3122 EXPORT_SYMBOL_GPL(validate_xmit_skb_list
);
3124 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
3126 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3128 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
3130 /* To get more precise estimation of bytes sent on wire,
3131 * we add to pkt_len the headers size of all segments
3133 if (shinfo
->gso_size
) {
3134 unsigned int hdr_len
;
3135 u16 gso_segs
= shinfo
->gso_segs
;
3137 /* mac layer + network layer */
3138 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
3140 /* + transport layer */
3141 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
3142 hdr_len
+= tcp_hdrlen(skb
);
3144 hdr_len
+= sizeof(struct udphdr
);
3146 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
3147 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
3150 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
3154 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
3155 struct net_device
*dev
,
3156 struct netdev_queue
*txq
)
3158 spinlock_t
*root_lock
= qdisc_lock(q
);
3159 struct sk_buff
*to_free
= NULL
;
3163 qdisc_calculate_pkt_len(skb
, q
);
3165 * Heuristic to force contended enqueues to serialize on a
3166 * separate lock before trying to get qdisc main lock.
3167 * This permits qdisc->running owner to get the lock more
3168 * often and dequeue packets faster.
3170 contended
= qdisc_is_running(q
);
3171 if (unlikely(contended
))
3172 spin_lock(&q
->busylock
);
3174 spin_lock(root_lock
);
3175 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
3176 __qdisc_drop(skb
, &to_free
);
3178 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
3179 qdisc_run_begin(q
)) {
3181 * This is a work-conserving queue; there are no old skbs
3182 * waiting to be sent out; and the qdisc is not running -
3183 * xmit the skb directly.
3186 qdisc_bstats_update(q
, skb
);
3188 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
, true)) {
3189 if (unlikely(contended
)) {
3190 spin_unlock(&q
->busylock
);
3197 rc
= NET_XMIT_SUCCESS
;
3199 rc
= q
->enqueue(skb
, q
, &to_free
) & NET_XMIT_MASK
;
3200 if (qdisc_run_begin(q
)) {
3201 if (unlikely(contended
)) {
3202 spin_unlock(&q
->busylock
);
3208 spin_unlock(root_lock
);
3209 if (unlikely(to_free
))
3210 kfree_skb_list(to_free
);
3211 if (unlikely(contended
))
3212 spin_unlock(&q
->busylock
);
3216 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
3217 static void skb_update_prio(struct sk_buff
*skb
)
3219 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
3221 if (!skb
->priority
&& skb
->sk
&& map
) {
3222 unsigned int prioidx
=
3223 sock_cgroup_prioidx(&skb
->sk
->sk_cgrp_data
);
3225 if (prioidx
< map
->priomap_len
)
3226 skb
->priority
= map
->priomap
[prioidx
];
3230 #define skb_update_prio(skb)
3233 DEFINE_PER_CPU(int, xmit_recursion
);
3234 EXPORT_SYMBOL(xmit_recursion
);
3237 * dev_loopback_xmit - loop back @skb
3238 * @net: network namespace this loopback is happening in
3239 * @sk: sk needed to be a netfilter okfn
3240 * @skb: buffer to transmit
3242 int dev_loopback_xmit(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
3244 skb_reset_mac_header(skb
);
3245 __skb_pull(skb
, skb_network_offset(skb
));
3246 skb
->pkt_type
= PACKET_LOOPBACK
;
3247 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
3248 WARN_ON(!skb_dst(skb
));
3253 EXPORT_SYMBOL(dev_loopback_xmit
);
3255 #ifdef CONFIG_NET_EGRESS
3256 static struct sk_buff
*
3257 sch_handle_egress(struct sk_buff
*skb
, int *ret
, struct net_device
*dev
)
3259 struct mini_Qdisc
*miniq
= rcu_dereference_bh(dev
->miniq_egress
);
3260 struct tcf_result cl_res
;
3265 /* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */
3266 mini_qdisc_bstats_cpu_update(miniq
, skb
);
3268 switch (tcf_classify(skb
, miniq
->filter_list
, &cl_res
, false)) {
3270 case TC_ACT_RECLASSIFY
:
3271 skb
->tc_index
= TC_H_MIN(cl_res
.classid
);
3274 mini_qdisc_qstats_cpu_drop(miniq
);
3275 *ret
= NET_XMIT_DROP
;
3281 *ret
= NET_XMIT_SUCCESS
;
3284 case TC_ACT_REDIRECT
:
3285 /* No need to push/pop skb's mac_header here on egress! */
3286 skb_do_redirect(skb
);
3287 *ret
= NET_XMIT_SUCCESS
;
3295 #endif /* CONFIG_NET_EGRESS */
3297 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
3300 struct xps_dev_maps
*dev_maps
;
3301 struct xps_map
*map
;
3302 int queue_index
= -1;
3305 dev_maps
= rcu_dereference(dev
->xps_maps
);
3307 unsigned int tci
= skb
->sender_cpu
- 1;
3311 tci
+= netdev_get_prio_tc_map(dev
, skb
->priority
);
3314 map
= rcu_dereference(dev_maps
->cpu_map
[tci
]);
3317 queue_index
= map
->queues
[0];
3319 queue_index
= map
->queues
[reciprocal_scale(skb_get_hash(skb
),
3321 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
3333 static u16
__netdev_pick_tx(struct net_device
*dev
, struct sk_buff
*skb
)
3335 struct sock
*sk
= skb
->sk
;
3336 int queue_index
= sk_tx_queue_get(sk
);
3338 if (queue_index
< 0 || skb
->ooo_okay
||
3339 queue_index
>= dev
->real_num_tx_queues
) {
3340 int new_index
= get_xps_queue(dev
, skb
);
3343 new_index
= skb_tx_hash(dev
, skb
);
3345 if (queue_index
!= new_index
&& sk
&&
3347 rcu_access_pointer(sk
->sk_dst_cache
))
3348 sk_tx_queue_set(sk
, new_index
);
3350 queue_index
= new_index
;
3356 struct netdev_queue
*netdev_pick_tx(struct net_device
*dev
,
3357 struct sk_buff
*skb
,
3360 int queue_index
= 0;
3363 u32 sender_cpu
= skb
->sender_cpu
- 1;
3365 if (sender_cpu
>= (u32
)NR_CPUS
)
3366 skb
->sender_cpu
= raw_smp_processor_id() + 1;
3369 if (dev
->real_num_tx_queues
!= 1) {
3370 const struct net_device_ops
*ops
= dev
->netdev_ops
;
3372 if (ops
->ndo_select_queue
)
3373 queue_index
= ops
->ndo_select_queue(dev
, skb
, accel_priv
,
3376 queue_index
= __netdev_pick_tx(dev
, skb
);
3379 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
3382 skb_set_queue_mapping(skb
, queue_index
);
3383 return netdev_get_tx_queue(dev
, queue_index
);
3387 * __dev_queue_xmit - transmit a buffer
3388 * @skb: buffer to transmit
3389 * @accel_priv: private data used for L2 forwarding offload
3391 * Queue a buffer for transmission to a network device. The caller must
3392 * have set the device and priority and built the buffer before calling
3393 * this function. The function can be called from an interrupt.
3395 * A negative errno code is returned on a failure. A success does not
3396 * guarantee the frame will be transmitted as it may be dropped due
3397 * to congestion or traffic shaping.
3399 * -----------------------------------------------------------------------------------
3400 * I notice this method can also return errors from the queue disciplines,
3401 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3404 * Regardless of the return value, the skb is consumed, so it is currently
3405 * difficult to retry a send to this method. (You can bump the ref count
3406 * before sending to hold a reference for retry if you are careful.)
3408 * When calling this method, interrupts MUST be enabled. This is because
3409 * the BH enable code must have IRQs enabled so that it will not deadlock.
3412 static int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
3414 struct net_device
*dev
= skb
->dev
;
3415 struct netdev_queue
*txq
;
3419 skb_reset_mac_header(skb
);
3421 if (unlikely(skb_shinfo(skb
)->tx_flags
& SKBTX_SCHED_TSTAMP
))
3422 __skb_tstamp_tx(skb
, NULL
, skb
->sk
, SCM_TSTAMP_SCHED
);
3424 /* Disable soft irqs for various locks below. Also
3425 * stops preemption for RCU.
3429 skb_update_prio(skb
);
3431 qdisc_pkt_len_init(skb
);
3432 #ifdef CONFIG_NET_CLS_ACT
3433 skb
->tc_at_ingress
= 0;
3434 # ifdef CONFIG_NET_EGRESS
3435 if (static_key_false(&egress_needed
)) {
3436 skb
= sch_handle_egress(skb
, &rc
, dev
);
3442 /* If device/qdisc don't need skb->dst, release it right now while
3443 * its hot in this cpu cache.
3445 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
3450 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
3451 q
= rcu_dereference_bh(txq
->qdisc
);
3453 trace_net_dev_queue(skb
);
3455 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
3459 /* The device has no queue. Common case for software devices:
3460 * loopback, all the sorts of tunnels...
3462 * Really, it is unlikely that netif_tx_lock protection is necessary
3463 * here. (f.e. loopback and IP tunnels are clean ignoring statistics
3465 * However, it is possible, that they rely on protection
3468 * Check this and shot the lock. It is not prone from deadlocks.
3469 *Either shot noqueue qdisc, it is even simpler 8)
3471 if (dev
->flags
& IFF_UP
) {
3472 int cpu
= smp_processor_id(); /* ok because BHs are off */
3474 if (txq
->xmit_lock_owner
!= cpu
) {
3475 if (unlikely(__this_cpu_read(xmit_recursion
) >
3476 XMIT_RECURSION_LIMIT
))
3477 goto recursion_alert
;
3479 skb
= validate_xmit_skb(skb
, dev
);
3483 HARD_TX_LOCK(dev
, txq
, cpu
);
3485 if (!netif_xmit_stopped(txq
)) {
3486 __this_cpu_inc(xmit_recursion
);
3487 skb
= dev_hard_start_xmit(skb
, dev
, txq
, &rc
);
3488 __this_cpu_dec(xmit_recursion
);
3489 if (dev_xmit_complete(rc
)) {
3490 HARD_TX_UNLOCK(dev
, txq
);
3494 HARD_TX_UNLOCK(dev
, txq
);
3495 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3498 /* Recursion is detected! It is possible,
3502 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3508 rcu_read_unlock_bh();
3510 atomic_long_inc(&dev
->tx_dropped
);
3511 kfree_skb_list(skb
);
3514 rcu_read_unlock_bh();
3518 int dev_queue_xmit(struct sk_buff
*skb
)
3520 return __dev_queue_xmit(skb
, NULL
);
3522 EXPORT_SYMBOL(dev_queue_xmit
);
3524 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
3526 return __dev_queue_xmit(skb
, accel_priv
);
3528 EXPORT_SYMBOL(dev_queue_xmit_accel
);
3531 /*************************************************************************
3533 *************************************************************************/
3535 int netdev_max_backlog __read_mostly
= 1000;
3536 EXPORT_SYMBOL(netdev_max_backlog
);
3538 int netdev_tstamp_prequeue __read_mostly
= 1;
3539 int netdev_budget __read_mostly
= 300;
3540 unsigned int __read_mostly netdev_budget_usecs
= 2000;
3541 int weight_p __read_mostly
= 64; /* old backlog weight */
3542 int dev_weight_rx_bias __read_mostly
= 1; /* bias for backlog weight */
3543 int dev_weight_tx_bias __read_mostly
= 1; /* bias for output_queue quota */
3544 int dev_rx_weight __read_mostly
= 64;
3545 int dev_tx_weight __read_mostly
= 64;
3547 /* Called with irq disabled */
3548 static inline void ____napi_schedule(struct softnet_data
*sd
,
3549 struct napi_struct
*napi
)
3551 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
3552 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3557 /* One global table that all flow-based protocols share. */
3558 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
3559 EXPORT_SYMBOL(rps_sock_flow_table
);
3560 u32 rps_cpu_mask __read_mostly
;
3561 EXPORT_SYMBOL(rps_cpu_mask
);
3563 struct static_key rps_needed __read_mostly
;
3564 EXPORT_SYMBOL(rps_needed
);
3565 struct static_key rfs_needed __read_mostly
;
3566 EXPORT_SYMBOL(rfs_needed
);
3568 static struct rps_dev_flow
*
3569 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3570 struct rps_dev_flow
*rflow
, u16 next_cpu
)
3572 if (next_cpu
< nr_cpu_ids
) {
3573 #ifdef CONFIG_RFS_ACCEL
3574 struct netdev_rx_queue
*rxqueue
;
3575 struct rps_dev_flow_table
*flow_table
;
3576 struct rps_dev_flow
*old_rflow
;
3581 /* Should we steer this flow to a different hardware queue? */
3582 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
3583 !(dev
->features
& NETIF_F_NTUPLE
))
3585 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
3586 if (rxq_index
== skb_get_rx_queue(skb
))
3589 rxqueue
= dev
->_rx
+ rxq_index
;
3590 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3593 flow_id
= skb_get_hash(skb
) & flow_table
->mask
;
3594 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
3595 rxq_index
, flow_id
);
3599 rflow
= &flow_table
->flows
[flow_id
];
3601 if (old_rflow
->filter
== rflow
->filter
)
3602 old_rflow
->filter
= RPS_NO_FILTER
;
3606 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
3609 rflow
->cpu
= next_cpu
;
3614 * get_rps_cpu is called from netif_receive_skb and returns the target
3615 * CPU from the RPS map of the receiving queue for a given skb.
3616 * rcu_read_lock must be held on entry.
3618 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3619 struct rps_dev_flow
**rflowp
)
3621 const struct rps_sock_flow_table
*sock_flow_table
;
3622 struct netdev_rx_queue
*rxqueue
= dev
->_rx
;
3623 struct rps_dev_flow_table
*flow_table
;
3624 struct rps_map
*map
;
3629 if (skb_rx_queue_recorded(skb
)) {
3630 u16 index
= skb_get_rx_queue(skb
);
3632 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
3633 WARN_ONCE(dev
->real_num_rx_queues
> 1,
3634 "%s received packet on queue %u, but number "
3635 "of RX queues is %u\n",
3636 dev
->name
, index
, dev
->real_num_rx_queues
);
3642 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3644 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3645 map
= rcu_dereference(rxqueue
->rps_map
);
3646 if (!flow_table
&& !map
)
3649 skb_reset_network_header(skb
);
3650 hash
= skb_get_hash(skb
);
3654 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3655 if (flow_table
&& sock_flow_table
) {
3656 struct rps_dev_flow
*rflow
;
3660 /* First check into global flow table if there is a match */
3661 ident
= sock_flow_table
->ents
[hash
& sock_flow_table
->mask
];
3662 if ((ident
^ hash
) & ~rps_cpu_mask
)
3665 next_cpu
= ident
& rps_cpu_mask
;
3667 /* OK, now we know there is a match,
3668 * we can look at the local (per receive queue) flow table
3670 rflow
= &flow_table
->flows
[hash
& flow_table
->mask
];
3674 * If the desired CPU (where last recvmsg was done) is
3675 * different from current CPU (one in the rx-queue flow
3676 * table entry), switch if one of the following holds:
3677 * - Current CPU is unset (>= nr_cpu_ids).
3678 * - Current CPU is offline.
3679 * - The current CPU's queue tail has advanced beyond the
3680 * last packet that was enqueued using this table entry.
3681 * This guarantees that all previous packets for the flow
3682 * have been dequeued, thus preserving in order delivery.
3684 if (unlikely(tcpu
!= next_cpu
) &&
3685 (tcpu
>= nr_cpu_ids
|| !cpu_online(tcpu
) ||
3686 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3687 rflow
->last_qtail
)) >= 0)) {
3689 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3692 if (tcpu
< nr_cpu_ids
&& cpu_online(tcpu
)) {
3702 tcpu
= map
->cpus
[reciprocal_scale(hash
, map
->len
)];
3703 if (cpu_online(tcpu
)) {
3713 #ifdef CONFIG_RFS_ACCEL
3716 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3717 * @dev: Device on which the filter was set
3718 * @rxq_index: RX queue index
3719 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3720 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3722 * Drivers that implement ndo_rx_flow_steer() should periodically call
3723 * this function for each installed filter and remove the filters for
3724 * which it returns %true.
3726 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3727 u32 flow_id
, u16 filter_id
)
3729 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3730 struct rps_dev_flow_table
*flow_table
;
3731 struct rps_dev_flow
*rflow
;
3736 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3737 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3738 rflow
= &flow_table
->flows
[flow_id
];
3739 cpu
= ACCESS_ONCE(rflow
->cpu
);
3740 if (rflow
->filter
== filter_id
&& cpu
< nr_cpu_ids
&&
3741 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3742 rflow
->last_qtail
) <
3743 (int)(10 * flow_table
->mask
)))
3749 EXPORT_SYMBOL(rps_may_expire_flow
);
3751 #endif /* CONFIG_RFS_ACCEL */
3753 /* Called from hardirq (IPI) context */
3754 static void rps_trigger_softirq(void *data
)
3756 struct softnet_data
*sd
= data
;
3758 ____napi_schedule(sd
, &sd
->backlog
);
3762 #endif /* CONFIG_RPS */
3765 * Check if this softnet_data structure is another cpu one
3766 * If yes, queue it to our IPI list and return 1
3769 static int rps_ipi_queued(struct softnet_data
*sd
)
3772 struct softnet_data
*mysd
= this_cpu_ptr(&softnet_data
);
3775 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3776 mysd
->rps_ipi_list
= sd
;
3778 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3781 #endif /* CONFIG_RPS */
3785 #ifdef CONFIG_NET_FLOW_LIMIT
3786 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3789 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3791 #ifdef CONFIG_NET_FLOW_LIMIT
3792 struct sd_flow_limit
*fl
;
3793 struct softnet_data
*sd
;
3794 unsigned int old_flow
, new_flow
;
3796 if (qlen
< (netdev_max_backlog
>> 1))
3799 sd
= this_cpu_ptr(&softnet_data
);
3802 fl
= rcu_dereference(sd
->flow_limit
);
3804 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3805 old_flow
= fl
->history
[fl
->history_head
];
3806 fl
->history
[fl
->history_head
] = new_flow
;
3809 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3811 if (likely(fl
->buckets
[old_flow
]))
3812 fl
->buckets
[old_flow
]--;
3814 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3826 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3827 * queue (may be a remote CPU queue).
3829 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3830 unsigned int *qtail
)
3832 struct softnet_data
*sd
;
3833 unsigned long flags
;
3836 sd
= &per_cpu(softnet_data
, cpu
);
3838 local_irq_save(flags
);
3841 if (!netif_running(skb
->dev
))
3843 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3844 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3847 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3848 input_queue_tail_incr_save(sd
, qtail
);
3850 local_irq_restore(flags
);
3851 return NET_RX_SUCCESS
;
3854 /* Schedule NAPI for backlog device
3855 * We can use non atomic operation since we own the queue lock
3857 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3858 if (!rps_ipi_queued(sd
))
3859 ____napi_schedule(sd
, &sd
->backlog
);
3868 local_irq_restore(flags
);
3870 atomic_long_inc(&skb
->dev
->rx_dropped
);
3875 static u32
netif_receive_generic_xdp(struct sk_buff
*skb
,
3876 struct bpf_prog
*xdp_prog
)
3878 u32 metalen
, act
= XDP_DROP
;
3879 struct xdp_buff xdp
;
3884 /* Reinjected packets coming from act_mirred or similar should
3885 * not get XDP generic processing.
3887 if (skb_cloned(skb
))
3890 /* XDP packets must be linear and must have sufficient headroom
3891 * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also
3892 * native XDP provides, thus we need to do it here as well.
3894 if (skb_is_nonlinear(skb
) ||
3895 skb_headroom(skb
) < XDP_PACKET_HEADROOM
) {
3896 int hroom
= XDP_PACKET_HEADROOM
- skb_headroom(skb
);
3897 int troom
= skb
->tail
+ skb
->data_len
- skb
->end
;
3899 /* In case we have to go down the path and also linearize,
3900 * then lets do the pskb_expand_head() work just once here.
3902 if (pskb_expand_head(skb
,
3903 hroom
> 0 ? ALIGN(hroom
, NET_SKB_PAD
) : 0,
3904 troom
> 0 ? troom
+ 128 : 0, GFP_ATOMIC
))
3906 if (troom
> 0 && __skb_linearize(skb
))
3910 /* The XDP program wants to see the packet starting at the MAC
3913 mac_len
= skb
->data
- skb_mac_header(skb
);
3914 hlen
= skb_headlen(skb
) + mac_len
;
3915 xdp
.data
= skb
->data
- mac_len
;
3916 xdp
.data_meta
= xdp
.data
;
3917 xdp
.data_end
= xdp
.data
+ hlen
;
3918 xdp
.data_hard_start
= skb
->data
- skb_headroom(skb
);
3919 orig_data
= xdp
.data
;
3921 act
= bpf_prog_run_xdp(xdp_prog
, &xdp
);
3923 off
= xdp
.data
- orig_data
;
3925 __skb_pull(skb
, off
);
3927 __skb_push(skb
, -off
);
3928 skb
->mac_header
+= off
;
3933 __skb_push(skb
, mac_len
);
3936 metalen
= xdp
.data
- xdp
.data_meta
;
3938 skb_metadata_set(skb
, metalen
);
3941 bpf_warn_invalid_xdp_action(act
);
3944 trace_xdp_exception(skb
->dev
, xdp_prog
, act
);
3955 /* When doing generic XDP we have to bypass the qdisc layer and the
3956 * network taps in order to match in-driver-XDP behavior.
3958 void generic_xdp_tx(struct sk_buff
*skb
, struct bpf_prog
*xdp_prog
)
3960 struct net_device
*dev
= skb
->dev
;
3961 struct netdev_queue
*txq
;
3962 bool free_skb
= true;
3965 txq
= netdev_pick_tx(dev
, skb
, NULL
);
3966 cpu
= smp_processor_id();
3967 HARD_TX_LOCK(dev
, txq
, cpu
);
3968 if (!netif_xmit_stopped(txq
)) {
3969 rc
= netdev_start_xmit(skb
, dev
, txq
, 0);
3970 if (dev_xmit_complete(rc
))
3973 HARD_TX_UNLOCK(dev
, txq
);
3975 trace_xdp_exception(dev
, xdp_prog
, XDP_TX
);
3979 EXPORT_SYMBOL_GPL(generic_xdp_tx
);
3981 static struct static_key generic_xdp_needed __read_mostly
;
3983 int do_xdp_generic(struct bpf_prog
*xdp_prog
, struct sk_buff
*skb
)
3986 u32 act
= netif_receive_generic_xdp(skb
, xdp_prog
);
3989 if (act
!= XDP_PASS
) {
3992 err
= xdp_do_generic_redirect(skb
->dev
, skb
,
3996 /* fallthru to submit skb */
3998 generic_xdp_tx(skb
, xdp_prog
);
4009 EXPORT_SYMBOL_GPL(do_xdp_generic
);
4011 static int netif_rx_internal(struct sk_buff
*skb
)
4015 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
4017 trace_netif_rx(skb
);
4019 if (static_key_false(&generic_xdp_needed
)) {
4024 ret
= do_xdp_generic(rcu_dereference(skb
->dev
->xdp_prog
), skb
);
4028 /* Consider XDP consuming the packet a success from
4029 * the netdev point of view we do not want to count
4032 if (ret
!= XDP_PASS
)
4033 return NET_RX_SUCCESS
;
4037 if (static_key_false(&rps_needed
)) {
4038 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
4044 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
4046 cpu
= smp_processor_id();
4048 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
4057 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
4064 * netif_rx - post buffer to the network code
4065 * @skb: buffer to post
4067 * This function receives a packet from a device driver and queues it for
4068 * the upper (protocol) levels to process. It always succeeds. The buffer
4069 * may be dropped during processing for congestion control or by the
4073 * NET_RX_SUCCESS (no congestion)
4074 * NET_RX_DROP (packet was dropped)
4078 int netif_rx(struct sk_buff
*skb
)
4080 trace_netif_rx_entry(skb
);
4082 return netif_rx_internal(skb
);
4084 EXPORT_SYMBOL(netif_rx
);
4086 int netif_rx_ni(struct sk_buff
*skb
)
4090 trace_netif_rx_ni_entry(skb
);
4093 err
= netif_rx_internal(skb
);
4094 if (local_softirq_pending())
4100 EXPORT_SYMBOL(netif_rx_ni
);
4102 static __latent_entropy
void net_tx_action(struct softirq_action
*h
)
4104 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4106 if (sd
->completion_queue
) {
4107 struct sk_buff
*clist
;
4109 local_irq_disable();
4110 clist
= sd
->completion_queue
;
4111 sd
->completion_queue
= NULL
;
4115 struct sk_buff
*skb
= clist
;
4117 clist
= clist
->next
;
4119 WARN_ON(refcount_read(&skb
->users
));
4120 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
4121 trace_consume_skb(skb
);
4123 trace_kfree_skb(skb
, net_tx_action
);
4125 if (skb
->fclone
!= SKB_FCLONE_UNAVAILABLE
)
4128 __kfree_skb_defer(skb
);
4131 __kfree_skb_flush();
4134 if (sd
->output_queue
) {
4137 local_irq_disable();
4138 head
= sd
->output_queue
;
4139 sd
->output_queue
= NULL
;
4140 sd
->output_queue_tailp
= &sd
->output_queue
;
4144 struct Qdisc
*q
= head
;
4145 spinlock_t
*root_lock
;
4147 head
= head
->next_sched
;
4149 root_lock
= qdisc_lock(q
);
4150 spin_lock(root_lock
);
4151 /* We need to make sure head->next_sched is read
4152 * before clearing __QDISC_STATE_SCHED
4154 smp_mb__before_atomic();
4155 clear_bit(__QDISC_STATE_SCHED
, &q
->state
);
4157 spin_unlock(root_lock
);
4162 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE)
4163 /* This hook is defined here for ATM LANE */
4164 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
4165 unsigned char *addr
) __read_mostly
;
4166 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
4169 static inline struct sk_buff
*
4170 sch_handle_ingress(struct sk_buff
*skb
, struct packet_type
**pt_prev
, int *ret
,
4171 struct net_device
*orig_dev
)
4173 #ifdef CONFIG_NET_CLS_ACT
4174 struct mini_Qdisc
*miniq
= rcu_dereference_bh(skb
->dev
->miniq_ingress
);
4175 struct tcf_result cl_res
;
4177 /* If there's at least one ingress present somewhere (so
4178 * we get here via enabled static key), remaining devices
4179 * that are not configured with an ingress qdisc will bail
4186 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
4190 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
4191 skb
->tc_at_ingress
= 1;
4192 mini_qdisc_bstats_cpu_update(miniq
, skb
);
4194 switch (tcf_classify(skb
, miniq
->filter_list
, &cl_res
, false)) {
4196 case TC_ACT_RECLASSIFY
:
4197 skb
->tc_index
= TC_H_MIN(cl_res
.classid
);
4200 mini_qdisc_qstats_cpu_drop(miniq
);
4208 case TC_ACT_REDIRECT
:
4209 /* skb_mac_header check was done by cls/act_bpf, so
4210 * we can safely push the L2 header back before
4211 * redirecting to another netdev
4213 __skb_push(skb
, skb
->mac_len
);
4214 skb_do_redirect(skb
);
4219 #endif /* CONFIG_NET_CLS_ACT */
4224 * netdev_is_rx_handler_busy - check if receive handler is registered
4225 * @dev: device to check
4227 * Check if a receive handler is already registered for a given device.
4228 * Return true if there one.
4230 * The caller must hold the rtnl_mutex.
4232 bool netdev_is_rx_handler_busy(struct net_device
*dev
)
4235 return dev
&& rtnl_dereference(dev
->rx_handler
);
4237 EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy
);
4240 * netdev_rx_handler_register - register receive handler
4241 * @dev: device to register a handler for
4242 * @rx_handler: receive handler to register
4243 * @rx_handler_data: data pointer that is used by rx handler
4245 * Register a receive handler for a device. This handler will then be
4246 * called from __netif_receive_skb. A negative errno code is returned
4249 * The caller must hold the rtnl_mutex.
4251 * For a general description of rx_handler, see enum rx_handler_result.
4253 int netdev_rx_handler_register(struct net_device
*dev
,
4254 rx_handler_func_t
*rx_handler
,
4255 void *rx_handler_data
)
4257 if (netdev_is_rx_handler_busy(dev
))
4260 /* Note: rx_handler_data must be set before rx_handler */
4261 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
4262 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
4266 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
4269 * netdev_rx_handler_unregister - unregister receive handler
4270 * @dev: device to unregister a handler from
4272 * Unregister a receive handler from a device.
4274 * The caller must hold the rtnl_mutex.
4276 void netdev_rx_handler_unregister(struct net_device
*dev
)
4280 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
4281 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
4282 * section has a guarantee to see a non NULL rx_handler_data
4286 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
4288 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
4291 * Limit the use of PFMEMALLOC reserves to those protocols that implement
4292 * the special handling of PFMEMALLOC skbs.
4294 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
4296 switch (skb
->protocol
) {
4297 case htons(ETH_P_ARP
):
4298 case htons(ETH_P_IP
):
4299 case htons(ETH_P_IPV6
):
4300 case htons(ETH_P_8021Q
):
4301 case htons(ETH_P_8021AD
):
4308 static inline int nf_ingress(struct sk_buff
*skb
, struct packet_type
**pt_prev
,
4309 int *ret
, struct net_device
*orig_dev
)
4311 #ifdef CONFIG_NETFILTER_INGRESS
4312 if (nf_hook_ingress_active(skb
)) {
4316 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
4321 ingress_retval
= nf_hook_ingress(skb
);
4323 return ingress_retval
;
4325 #endif /* CONFIG_NETFILTER_INGRESS */
4329 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
4331 struct packet_type
*ptype
, *pt_prev
;
4332 rx_handler_func_t
*rx_handler
;
4333 struct net_device
*orig_dev
;
4334 bool deliver_exact
= false;
4335 int ret
= NET_RX_DROP
;
4338 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
4340 trace_netif_receive_skb(skb
);
4342 orig_dev
= skb
->dev
;
4344 skb_reset_network_header(skb
);
4345 if (!skb_transport_header_was_set(skb
))
4346 skb_reset_transport_header(skb
);
4347 skb_reset_mac_len(skb
);
4352 skb
->skb_iif
= skb
->dev
->ifindex
;
4354 __this_cpu_inc(softnet_data
.processed
);
4356 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
4357 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
4358 skb
= skb_vlan_untag(skb
);
4363 if (skb_skip_tc_classify(skb
))
4369 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
4371 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
4375 list_for_each_entry_rcu(ptype
, &skb
->dev
->ptype_all
, list
) {
4377 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
4382 #ifdef CONFIG_NET_INGRESS
4383 if (static_key_false(&ingress_needed
)) {
4384 skb
= sch_handle_ingress(skb
, &pt_prev
, &ret
, orig_dev
);
4388 if (nf_ingress(skb
, &pt_prev
, &ret
, orig_dev
) < 0)
4394 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
4397 if (skb_vlan_tag_present(skb
)) {
4399 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
4402 if (vlan_do_receive(&skb
))
4404 else if (unlikely(!skb
))
4408 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
4411 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
4414 switch (rx_handler(&skb
)) {
4415 case RX_HANDLER_CONSUMED
:
4416 ret
= NET_RX_SUCCESS
;
4418 case RX_HANDLER_ANOTHER
:
4420 case RX_HANDLER_EXACT
:
4421 deliver_exact
= true;
4422 case RX_HANDLER_PASS
:
4429 if (unlikely(skb_vlan_tag_present(skb
))) {
4430 if (skb_vlan_tag_get_id(skb
))
4431 skb
->pkt_type
= PACKET_OTHERHOST
;
4432 /* Note: we might in the future use prio bits
4433 * and set skb->priority like in vlan_do_receive()
4434 * For the time being, just ignore Priority Code Point
4439 type
= skb
->protocol
;
4441 /* deliver only exact match when indicated */
4442 if (likely(!deliver_exact
)) {
4443 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
4444 &ptype_base
[ntohs(type
) &
4448 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
4449 &orig_dev
->ptype_specific
);
4451 if (unlikely(skb
->dev
!= orig_dev
)) {
4452 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
4453 &skb
->dev
->ptype_specific
);
4457 if (unlikely(skb_orphan_frags_rx(skb
, GFP_ATOMIC
)))
4460 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
4464 atomic_long_inc(&skb
->dev
->rx_dropped
);
4466 atomic_long_inc(&skb
->dev
->rx_nohandler
);
4468 /* Jamal, now you will not able to escape explaining
4469 * me how you were going to use this. :-)
4479 * netif_receive_skb_core - special purpose version of netif_receive_skb
4480 * @skb: buffer to process
4482 * More direct receive version of netif_receive_skb(). It should
4483 * only be used by callers that have a need to skip RPS and Generic XDP.
4484 * Caller must also take care of handling if (page_is_)pfmemalloc.
4486 * This function may only be called from softirq context and interrupts
4487 * should be enabled.
4489 * Return values (usually ignored):
4490 * NET_RX_SUCCESS: no congestion
4491 * NET_RX_DROP: packet was dropped
4493 int netif_receive_skb_core(struct sk_buff
*skb
)
4498 ret
= __netif_receive_skb_core(skb
, false);
4503 EXPORT_SYMBOL(netif_receive_skb_core
);
4505 static int __netif_receive_skb(struct sk_buff
*skb
)
4509 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
4510 unsigned int noreclaim_flag
;
4513 * PFMEMALLOC skbs are special, they should
4514 * - be delivered to SOCK_MEMALLOC sockets only
4515 * - stay away from userspace
4516 * - have bounded memory usage
4518 * Use PF_MEMALLOC as this saves us from propagating the allocation
4519 * context down to all allocation sites.
4521 noreclaim_flag
= memalloc_noreclaim_save();
4522 ret
= __netif_receive_skb_core(skb
, true);
4523 memalloc_noreclaim_restore(noreclaim_flag
);
4525 ret
= __netif_receive_skb_core(skb
, false);
4530 static int generic_xdp_install(struct net_device
*dev
, struct netdev_bpf
*xdp
)
4532 struct bpf_prog
*old
= rtnl_dereference(dev
->xdp_prog
);
4533 struct bpf_prog
*new = xdp
->prog
;
4536 switch (xdp
->command
) {
4537 case XDP_SETUP_PROG
:
4538 rcu_assign_pointer(dev
->xdp_prog
, new);
4543 static_key_slow_dec(&generic_xdp_needed
);
4544 } else if (new && !old
) {
4545 static_key_slow_inc(&generic_xdp_needed
);
4546 dev_disable_lro(dev
);
4550 case XDP_QUERY_PROG
:
4551 xdp
->prog_attached
= !!old
;
4552 xdp
->prog_id
= old
? old
->aux
->id
: 0;
4563 static int netif_receive_skb_internal(struct sk_buff
*skb
)
4567 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
4569 if (skb_defer_rx_timestamp(skb
))
4570 return NET_RX_SUCCESS
;
4572 if (static_key_false(&generic_xdp_needed
)) {
4577 ret
= do_xdp_generic(rcu_dereference(skb
->dev
->xdp_prog
), skb
);
4581 if (ret
!= XDP_PASS
)
4587 if (static_key_false(&rps_needed
)) {
4588 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
4589 int cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
4592 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
4598 ret
= __netif_receive_skb(skb
);
4604 * netif_receive_skb - process receive buffer from network
4605 * @skb: buffer to process
4607 * netif_receive_skb() is the main receive data processing function.
4608 * It always succeeds. The buffer may be dropped during processing
4609 * for congestion control or by the protocol layers.
4611 * This function may only be called from softirq context and interrupts
4612 * should be enabled.
4614 * Return values (usually ignored):
4615 * NET_RX_SUCCESS: no congestion
4616 * NET_RX_DROP: packet was dropped
4618 int netif_receive_skb(struct sk_buff
*skb
)
4620 trace_netif_receive_skb_entry(skb
);
4622 return netif_receive_skb_internal(skb
);
4624 EXPORT_SYMBOL(netif_receive_skb
);
4626 DEFINE_PER_CPU(struct work_struct
, flush_works
);
4628 /* Network device is going away, flush any packets still pending */
4629 static void flush_backlog(struct work_struct
*work
)
4631 struct sk_buff
*skb
, *tmp
;
4632 struct softnet_data
*sd
;
4635 sd
= this_cpu_ptr(&softnet_data
);
4637 local_irq_disable();
4639 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
4640 if (skb
->dev
->reg_state
== NETREG_UNREGISTERING
) {
4641 __skb_unlink(skb
, &sd
->input_pkt_queue
);
4643 input_queue_head_incr(sd
);
4649 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
4650 if (skb
->dev
->reg_state
== NETREG_UNREGISTERING
) {
4651 __skb_unlink(skb
, &sd
->process_queue
);
4653 input_queue_head_incr(sd
);
4659 static void flush_all_backlogs(void)
4665 for_each_online_cpu(cpu
)
4666 queue_work_on(cpu
, system_highpri_wq
,
4667 per_cpu_ptr(&flush_works
, cpu
));
4669 for_each_online_cpu(cpu
)
4670 flush_work(per_cpu_ptr(&flush_works
, cpu
));
4675 static int napi_gro_complete(struct sk_buff
*skb
)
4677 struct packet_offload
*ptype
;
4678 __be16 type
= skb
->protocol
;
4679 struct list_head
*head
= &offload_base
;
4682 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
4684 if (NAPI_GRO_CB(skb
)->count
== 1) {
4685 skb_shinfo(skb
)->gso_size
= 0;
4690 list_for_each_entry_rcu(ptype
, head
, list
) {
4691 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4694 err
= ptype
->callbacks
.gro_complete(skb
, 0);
4700 WARN_ON(&ptype
->list
== head
);
4702 return NET_RX_SUCCESS
;
4706 return netif_receive_skb_internal(skb
);
4709 /* napi->gro_list contains packets ordered by age.
4710 * youngest packets at the head of it.
4711 * Complete skbs in reverse order to reduce latencies.
4713 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
4715 struct sk_buff
*skb
, *prev
= NULL
;
4717 /* scan list and build reverse chain */
4718 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
4723 for (skb
= prev
; skb
; skb
= prev
) {
4726 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
4730 napi_gro_complete(skb
);
4734 napi
->gro_list
= NULL
;
4736 EXPORT_SYMBOL(napi_gro_flush
);
4738 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
4741 unsigned int maclen
= skb
->dev
->hard_header_len
;
4742 u32 hash
= skb_get_hash_raw(skb
);
4744 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
4745 unsigned long diffs
;
4747 NAPI_GRO_CB(p
)->flush
= 0;
4749 if (hash
!= skb_get_hash_raw(p
)) {
4750 NAPI_GRO_CB(p
)->same_flow
= 0;
4754 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
4755 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
4756 diffs
|= skb_metadata_dst_cmp(p
, skb
);
4757 diffs
|= skb_metadata_differs(p
, skb
);
4758 if (maclen
== ETH_HLEN
)
4759 diffs
|= compare_ether_header(skb_mac_header(p
),
4760 skb_mac_header(skb
));
4762 diffs
= memcmp(skb_mac_header(p
),
4763 skb_mac_header(skb
),
4765 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
4769 static void skb_gro_reset_offset(struct sk_buff
*skb
)
4771 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4772 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
4774 NAPI_GRO_CB(skb
)->data_offset
= 0;
4775 NAPI_GRO_CB(skb
)->frag0
= NULL
;
4776 NAPI_GRO_CB(skb
)->frag0_len
= 0;
4778 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
4780 !PageHighMem(skb_frag_page(frag0
))) {
4781 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
4782 NAPI_GRO_CB(skb
)->frag0_len
= min_t(unsigned int,
4783 skb_frag_size(frag0
),
4784 skb
->end
- skb
->tail
);
4788 static void gro_pull_from_frag0(struct sk_buff
*skb
, int grow
)
4790 struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4792 BUG_ON(skb
->end
- skb
->tail
< grow
);
4794 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
4796 skb
->data_len
-= grow
;
4799 pinfo
->frags
[0].page_offset
+= grow
;
4800 skb_frag_size_sub(&pinfo
->frags
[0], grow
);
4802 if (unlikely(!skb_frag_size(&pinfo
->frags
[0]))) {
4803 skb_frag_unref(skb
, 0);
4804 memmove(pinfo
->frags
, pinfo
->frags
+ 1,
4805 --pinfo
->nr_frags
* sizeof(pinfo
->frags
[0]));
4809 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4811 struct sk_buff
**pp
= NULL
;
4812 struct packet_offload
*ptype
;
4813 __be16 type
= skb
->protocol
;
4814 struct list_head
*head
= &offload_base
;
4816 enum gro_result ret
;
4819 if (netif_elide_gro(skb
->dev
))
4822 gro_list_prepare(napi
, skb
);
4825 list_for_each_entry_rcu(ptype
, head
, list
) {
4826 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4829 skb_set_network_header(skb
, skb_gro_offset(skb
));
4830 skb_reset_mac_len(skb
);
4831 NAPI_GRO_CB(skb
)->same_flow
= 0;
4832 NAPI_GRO_CB(skb
)->flush
= skb_is_gso(skb
) || skb_has_frag_list(skb
);
4833 NAPI_GRO_CB(skb
)->free
= 0;
4834 NAPI_GRO_CB(skb
)->encap_mark
= 0;
4835 NAPI_GRO_CB(skb
)->recursion_counter
= 0;
4836 NAPI_GRO_CB(skb
)->is_fou
= 0;
4837 NAPI_GRO_CB(skb
)->is_atomic
= 1;
4838 NAPI_GRO_CB(skb
)->gro_remcsum_start
= 0;
4840 /* Setup for GRO checksum validation */
4841 switch (skb
->ip_summed
) {
4842 case CHECKSUM_COMPLETE
:
4843 NAPI_GRO_CB(skb
)->csum
= skb
->csum
;
4844 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4845 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4847 case CHECKSUM_UNNECESSARY
:
4848 NAPI_GRO_CB(skb
)->csum_cnt
= skb
->csum_level
+ 1;
4849 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4852 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4853 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4856 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
4861 if (&ptype
->list
== head
)
4864 if (IS_ERR(pp
) && PTR_ERR(pp
) == -EINPROGRESS
) {
4869 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
4870 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
4873 struct sk_buff
*nskb
= *pp
;
4877 napi_gro_complete(nskb
);
4884 if (NAPI_GRO_CB(skb
)->flush
)
4887 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
4888 struct sk_buff
*nskb
= napi
->gro_list
;
4890 /* locate the end of the list to select the 'oldest' flow */
4891 while (nskb
->next
) {
4897 napi_gro_complete(nskb
);
4901 NAPI_GRO_CB(skb
)->count
= 1;
4902 NAPI_GRO_CB(skb
)->age
= jiffies
;
4903 NAPI_GRO_CB(skb
)->last
= skb
;
4904 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
4905 skb
->next
= napi
->gro_list
;
4906 napi
->gro_list
= skb
;
4910 grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
4912 gro_pull_from_frag0(skb
, grow
);
4921 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
4923 struct list_head
*offload_head
= &offload_base
;
4924 struct packet_offload
*ptype
;
4926 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4927 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4933 EXPORT_SYMBOL(gro_find_receive_by_type
);
4935 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
4937 struct list_head
*offload_head
= &offload_base
;
4938 struct packet_offload
*ptype
;
4940 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4941 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4947 EXPORT_SYMBOL(gro_find_complete_by_type
);
4949 static void napi_skb_free_stolen_head(struct sk_buff
*skb
)
4953 kmem_cache_free(skbuff_head_cache
, skb
);
4956 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
4960 if (netif_receive_skb_internal(skb
))
4968 case GRO_MERGED_FREE
:
4969 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
4970 napi_skb_free_stolen_head(skb
);
4984 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4986 skb_mark_napi_id(skb
, napi
);
4987 trace_napi_gro_receive_entry(skb
);
4989 skb_gro_reset_offset(skb
);
4991 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4993 EXPORT_SYMBOL(napi_gro_receive
);
4995 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4997 if (unlikely(skb
->pfmemalloc
)) {
5001 __skb_pull(skb
, skb_headlen(skb
));
5002 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
5003 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
5005 skb
->dev
= napi
->dev
;
5007 skb
->encapsulation
= 0;
5008 skb_shinfo(skb
)->gso_type
= 0;
5009 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
5015 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
5017 struct sk_buff
*skb
= napi
->skb
;
5020 skb
= napi_alloc_skb(napi
, GRO_MAX_HEAD
);
5023 skb_mark_napi_id(skb
, napi
);
5028 EXPORT_SYMBOL(napi_get_frags
);
5030 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
5031 struct sk_buff
*skb
,
5037 __skb_push(skb
, ETH_HLEN
);
5038 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
5039 if (ret
== GRO_NORMAL
&& netif_receive_skb_internal(skb
))
5044 napi_reuse_skb(napi
, skb
);
5047 case GRO_MERGED_FREE
:
5048 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
5049 napi_skb_free_stolen_head(skb
);
5051 napi_reuse_skb(napi
, skb
);
5062 /* Upper GRO stack assumes network header starts at gro_offset=0
5063 * Drivers could call both napi_gro_frags() and napi_gro_receive()
5064 * We copy ethernet header into skb->data to have a common layout.
5066 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
5068 struct sk_buff
*skb
= napi
->skb
;
5069 const struct ethhdr
*eth
;
5070 unsigned int hlen
= sizeof(*eth
);
5074 skb_reset_mac_header(skb
);
5075 skb_gro_reset_offset(skb
);
5077 eth
= skb_gro_header_fast(skb
, 0);
5078 if (unlikely(skb_gro_header_hard(skb
, hlen
))) {
5079 eth
= skb_gro_header_slow(skb
, hlen
, 0);
5080 if (unlikely(!eth
)) {
5081 net_warn_ratelimited("%s: dropping impossible skb from %s\n",
5082 __func__
, napi
->dev
->name
);
5083 napi_reuse_skb(napi
, skb
);
5087 gro_pull_from_frag0(skb
, hlen
);
5088 NAPI_GRO_CB(skb
)->frag0
+= hlen
;
5089 NAPI_GRO_CB(skb
)->frag0_len
-= hlen
;
5091 __skb_pull(skb
, hlen
);
5094 * This works because the only protocols we care about don't require
5096 * We'll fix it up properly in napi_frags_finish()
5098 skb
->protocol
= eth
->h_proto
;
5103 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
5105 struct sk_buff
*skb
= napi_frags_skb(napi
);
5110 trace_napi_gro_frags_entry(skb
);
5112 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
5114 EXPORT_SYMBOL(napi_gro_frags
);
5116 /* Compute the checksum from gro_offset and return the folded value
5117 * after adding in any pseudo checksum.
5119 __sum16
__skb_gro_checksum_complete(struct sk_buff
*skb
)
5124 wsum
= skb_checksum(skb
, skb_gro_offset(skb
), skb_gro_len(skb
), 0);
5126 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
5127 sum
= csum_fold(csum_add(NAPI_GRO_CB(skb
)->csum
, wsum
));
5129 if (unlikely(skb
->ip_summed
== CHECKSUM_COMPLETE
) &&
5130 !skb
->csum_complete_sw
)
5131 netdev_rx_csum_fault(skb
->dev
);
5134 NAPI_GRO_CB(skb
)->csum
= wsum
;
5135 NAPI_GRO_CB(skb
)->csum_valid
= 1;
5139 EXPORT_SYMBOL(__skb_gro_checksum_complete
);
5141 static void net_rps_send_ipi(struct softnet_data
*remsd
)
5145 struct softnet_data
*next
= remsd
->rps_ipi_next
;
5147 if (cpu_online(remsd
->cpu
))
5148 smp_call_function_single_async(remsd
->cpu
, &remsd
->csd
);
5155 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
5156 * Note: called with local irq disabled, but exits with local irq enabled.
5158 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
5161 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
5164 sd
->rps_ipi_list
= NULL
;
5168 /* Send pending IPI's to kick RPS processing on remote cpus. */
5169 net_rps_send_ipi(remsd
);
5175 static bool sd_has_rps_ipi_waiting(struct softnet_data
*sd
)
5178 return sd
->rps_ipi_list
!= NULL
;
5184 static int process_backlog(struct napi_struct
*napi
, int quota
)
5186 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
5190 /* Check if we have pending ipi, its better to send them now,
5191 * not waiting net_rx_action() end.
5193 if (sd_has_rps_ipi_waiting(sd
)) {
5194 local_irq_disable();
5195 net_rps_action_and_irq_enable(sd
);
5198 napi
->weight
= dev_rx_weight
;
5200 struct sk_buff
*skb
;
5202 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
5204 __netif_receive_skb(skb
);
5206 input_queue_head_incr(sd
);
5207 if (++work
>= quota
)
5212 local_irq_disable();
5214 if (skb_queue_empty(&sd
->input_pkt_queue
)) {
5216 * Inline a custom version of __napi_complete().
5217 * only current cpu owns and manipulates this napi,
5218 * and NAPI_STATE_SCHED is the only possible flag set
5220 * We can use a plain write instead of clear_bit(),
5221 * and we dont need an smp_mb() memory barrier.
5226 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
5227 &sd
->process_queue
);
5237 * __napi_schedule - schedule for receive
5238 * @n: entry to schedule
5240 * The entry's receive function will be scheduled to run.
5241 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
5243 void __napi_schedule(struct napi_struct
*n
)
5245 unsigned long flags
;
5247 local_irq_save(flags
);
5248 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
5249 local_irq_restore(flags
);
5251 EXPORT_SYMBOL(__napi_schedule
);
5254 * napi_schedule_prep - check if napi can be scheduled
5257 * Test if NAPI routine is already running, and if not mark
5258 * it as running. This is used as a condition variable
5259 * insure only one NAPI poll instance runs. We also make
5260 * sure there is no pending NAPI disable.
5262 bool napi_schedule_prep(struct napi_struct
*n
)
5264 unsigned long val
, new;
5267 val
= READ_ONCE(n
->state
);
5268 if (unlikely(val
& NAPIF_STATE_DISABLE
))
5270 new = val
| NAPIF_STATE_SCHED
;
5272 /* Sets STATE_MISSED bit if STATE_SCHED was already set
5273 * This was suggested by Alexander Duyck, as compiler
5274 * emits better code than :
5275 * if (val & NAPIF_STATE_SCHED)
5276 * new |= NAPIF_STATE_MISSED;
5278 new |= (val
& NAPIF_STATE_SCHED
) / NAPIF_STATE_SCHED
*
5280 } while (cmpxchg(&n
->state
, val
, new) != val
);
5282 return !(val
& NAPIF_STATE_SCHED
);
5284 EXPORT_SYMBOL(napi_schedule_prep
);
5287 * __napi_schedule_irqoff - schedule for receive
5288 * @n: entry to schedule
5290 * Variant of __napi_schedule() assuming hard irqs are masked
5292 void __napi_schedule_irqoff(struct napi_struct
*n
)
5294 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
5296 EXPORT_SYMBOL(__napi_schedule_irqoff
);
5298 bool napi_complete_done(struct napi_struct
*n
, int work_done
)
5300 unsigned long flags
, val
, new;
5303 * 1) Don't let napi dequeue from the cpu poll list
5304 * just in case its running on a different cpu.
5305 * 2) If we are busy polling, do nothing here, we have
5306 * the guarantee we will be called later.
5308 if (unlikely(n
->state
& (NAPIF_STATE_NPSVC
|
5309 NAPIF_STATE_IN_BUSY_POLL
)))
5313 unsigned long timeout
= 0;
5316 timeout
= n
->dev
->gro_flush_timeout
;
5319 hrtimer_start(&n
->timer
, ns_to_ktime(timeout
),
5320 HRTIMER_MODE_REL_PINNED
);
5322 napi_gro_flush(n
, false);
5324 if (unlikely(!list_empty(&n
->poll_list
))) {
5325 /* If n->poll_list is not empty, we need to mask irqs */
5326 local_irq_save(flags
);
5327 list_del_init(&n
->poll_list
);
5328 local_irq_restore(flags
);
5332 val
= READ_ONCE(n
->state
);
5334 WARN_ON_ONCE(!(val
& NAPIF_STATE_SCHED
));
5336 new = val
& ~(NAPIF_STATE_MISSED
| NAPIF_STATE_SCHED
);
5338 /* If STATE_MISSED was set, leave STATE_SCHED set,
5339 * because we will call napi->poll() one more time.
5340 * This C code was suggested by Alexander Duyck to help gcc.
5342 new |= (val
& NAPIF_STATE_MISSED
) / NAPIF_STATE_MISSED
*
5344 } while (cmpxchg(&n
->state
, val
, new) != val
);
5346 if (unlikely(val
& NAPIF_STATE_MISSED
)) {
5353 EXPORT_SYMBOL(napi_complete_done
);
5355 /* must be called under rcu_read_lock(), as we dont take a reference */
5356 static struct napi_struct
*napi_by_id(unsigned int napi_id
)
5358 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
5359 struct napi_struct
*napi
;
5361 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
5362 if (napi
->napi_id
== napi_id
)
5368 #if defined(CONFIG_NET_RX_BUSY_POLL)
5370 #define BUSY_POLL_BUDGET 8
5372 static void busy_poll_stop(struct napi_struct
*napi
, void *have_poll_lock
)
5376 /* Busy polling means there is a high chance device driver hard irq
5377 * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was
5378 * set in napi_schedule_prep().
5379 * Since we are about to call napi->poll() once more, we can safely
5380 * clear NAPI_STATE_MISSED.
5382 * Note: x86 could use a single "lock and ..." instruction
5383 * to perform these two clear_bit()
5385 clear_bit(NAPI_STATE_MISSED
, &napi
->state
);
5386 clear_bit(NAPI_STATE_IN_BUSY_POLL
, &napi
->state
);
5390 /* All we really want here is to re-enable device interrupts.
5391 * Ideally, a new ndo_busy_poll_stop() could avoid another round.
5393 rc
= napi
->poll(napi
, BUSY_POLL_BUDGET
);
5394 trace_napi_poll(napi
, rc
, BUSY_POLL_BUDGET
);
5395 netpoll_poll_unlock(have_poll_lock
);
5396 if (rc
== BUSY_POLL_BUDGET
)
5397 __napi_schedule(napi
);
5401 void napi_busy_loop(unsigned int napi_id
,
5402 bool (*loop_end
)(void *, unsigned long),
5405 unsigned long start_time
= loop_end
? busy_loop_current_time() : 0;
5406 int (*napi_poll
)(struct napi_struct
*napi
, int budget
);
5407 void *have_poll_lock
= NULL
;
5408 struct napi_struct
*napi
;
5415 napi
= napi_by_id(napi_id
);
5425 unsigned long val
= READ_ONCE(napi
->state
);
5427 /* If multiple threads are competing for this napi,
5428 * we avoid dirtying napi->state as much as we can.
5430 if (val
& (NAPIF_STATE_DISABLE
| NAPIF_STATE_SCHED
|
5431 NAPIF_STATE_IN_BUSY_POLL
))
5433 if (cmpxchg(&napi
->state
, val
,
5434 val
| NAPIF_STATE_IN_BUSY_POLL
|
5435 NAPIF_STATE_SCHED
) != val
)
5437 have_poll_lock
= netpoll_poll_lock(napi
);
5438 napi_poll
= napi
->poll
;
5440 work
= napi_poll(napi
, BUSY_POLL_BUDGET
);
5441 trace_napi_poll(napi
, work
, BUSY_POLL_BUDGET
);
5444 __NET_ADD_STATS(dev_net(napi
->dev
),
5445 LINUX_MIB_BUSYPOLLRXPACKETS
, work
);
5448 if (!loop_end
|| loop_end(loop_end_arg
, start_time
))
5451 if (unlikely(need_resched())) {
5453 busy_poll_stop(napi
, have_poll_lock
);
5457 if (loop_end(loop_end_arg
, start_time
))
5464 busy_poll_stop(napi
, have_poll_lock
);
5469 EXPORT_SYMBOL(napi_busy_loop
);
5471 #endif /* CONFIG_NET_RX_BUSY_POLL */
5473 static void napi_hash_add(struct napi_struct
*napi
)
5475 if (test_bit(NAPI_STATE_NO_BUSY_POLL
, &napi
->state
) ||
5476 test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
))
5479 spin_lock(&napi_hash_lock
);
5481 /* 0..NR_CPUS range is reserved for sender_cpu use */
5483 if (unlikely(++napi_gen_id
< MIN_NAPI_ID
))
5484 napi_gen_id
= MIN_NAPI_ID
;
5485 } while (napi_by_id(napi_gen_id
));
5486 napi
->napi_id
= napi_gen_id
;
5488 hlist_add_head_rcu(&napi
->napi_hash_node
,
5489 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
5491 spin_unlock(&napi_hash_lock
);
5494 /* Warning : caller is responsible to make sure rcu grace period
5495 * is respected before freeing memory containing @napi
5497 bool napi_hash_del(struct napi_struct
*napi
)
5499 bool rcu_sync_needed
= false;
5501 spin_lock(&napi_hash_lock
);
5503 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
5504 rcu_sync_needed
= true;
5505 hlist_del_rcu(&napi
->napi_hash_node
);
5507 spin_unlock(&napi_hash_lock
);
5508 return rcu_sync_needed
;
5510 EXPORT_SYMBOL_GPL(napi_hash_del
);
5512 static enum hrtimer_restart
napi_watchdog(struct hrtimer
*timer
)
5514 struct napi_struct
*napi
;
5516 napi
= container_of(timer
, struct napi_struct
, timer
);
5518 /* Note : we use a relaxed variant of napi_schedule_prep() not setting
5519 * NAPI_STATE_MISSED, since we do not react to a device IRQ.
5521 if (napi
->gro_list
&& !napi_disable_pending(napi
) &&
5522 !test_and_set_bit(NAPI_STATE_SCHED
, &napi
->state
))
5523 __napi_schedule_irqoff(napi
);
5525 return HRTIMER_NORESTART
;
5528 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
5529 int (*poll
)(struct napi_struct
*, int), int weight
)
5531 INIT_LIST_HEAD(&napi
->poll_list
);
5532 hrtimer_init(&napi
->timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_REL_PINNED
);
5533 napi
->timer
.function
= napi_watchdog
;
5534 napi
->gro_count
= 0;
5535 napi
->gro_list
= NULL
;
5538 if (weight
> NAPI_POLL_WEIGHT
)
5539 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
5541 napi
->weight
= weight
;
5542 list_add(&napi
->dev_list
, &dev
->napi_list
);
5544 #ifdef CONFIG_NETPOLL
5545 napi
->poll_owner
= -1;
5547 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
5548 napi_hash_add(napi
);
5550 EXPORT_SYMBOL(netif_napi_add
);
5552 void napi_disable(struct napi_struct
*n
)
5555 set_bit(NAPI_STATE_DISABLE
, &n
->state
);
5557 while (test_and_set_bit(NAPI_STATE_SCHED
, &n
->state
))
5559 while (test_and_set_bit(NAPI_STATE_NPSVC
, &n
->state
))
5562 hrtimer_cancel(&n
->timer
);
5564 clear_bit(NAPI_STATE_DISABLE
, &n
->state
);
5566 EXPORT_SYMBOL(napi_disable
);
5568 /* Must be called in process context */
5569 void netif_napi_del(struct napi_struct
*napi
)
5572 if (napi_hash_del(napi
))
5574 list_del_init(&napi
->dev_list
);
5575 napi_free_frags(napi
);
5577 kfree_skb_list(napi
->gro_list
);
5578 napi
->gro_list
= NULL
;
5579 napi
->gro_count
= 0;
5581 EXPORT_SYMBOL(netif_napi_del
);
5583 static int napi_poll(struct napi_struct
*n
, struct list_head
*repoll
)
5588 list_del_init(&n
->poll_list
);
5590 have
= netpoll_poll_lock(n
);
5594 /* This NAPI_STATE_SCHED test is for avoiding a race
5595 * with netpoll's poll_napi(). Only the entity which
5596 * obtains the lock and sees NAPI_STATE_SCHED set will
5597 * actually make the ->poll() call. Therefore we avoid
5598 * accidentally calling ->poll() when NAPI is not scheduled.
5601 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
5602 work
= n
->poll(n
, weight
);
5603 trace_napi_poll(n
, work
, weight
);
5606 WARN_ON_ONCE(work
> weight
);
5608 if (likely(work
< weight
))
5611 /* Drivers must not modify the NAPI state if they
5612 * consume the entire weight. In such cases this code
5613 * still "owns" the NAPI instance and therefore can
5614 * move the instance around on the list at-will.
5616 if (unlikely(napi_disable_pending(n
))) {
5622 /* flush too old packets
5623 * If HZ < 1000, flush all packets.
5625 napi_gro_flush(n
, HZ
>= 1000);
5628 /* Some drivers may have called napi_schedule
5629 * prior to exhausting their budget.
5631 if (unlikely(!list_empty(&n
->poll_list
))) {
5632 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
5633 n
->dev
? n
->dev
->name
: "backlog");
5637 list_add_tail(&n
->poll_list
, repoll
);
5640 netpoll_poll_unlock(have
);
5645 static __latent_entropy
void net_rx_action(struct softirq_action
*h
)
5647 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
5648 unsigned long time_limit
= jiffies
+
5649 usecs_to_jiffies(netdev_budget_usecs
);
5650 int budget
= netdev_budget
;
5654 local_irq_disable();
5655 list_splice_init(&sd
->poll_list
, &list
);
5659 struct napi_struct
*n
;
5661 if (list_empty(&list
)) {
5662 if (!sd_has_rps_ipi_waiting(sd
) && list_empty(&repoll
))
5667 n
= list_first_entry(&list
, struct napi_struct
, poll_list
);
5668 budget
-= napi_poll(n
, &repoll
);
5670 /* If softirq window is exhausted then punt.
5671 * Allow this to run for 2 jiffies since which will allow
5672 * an average latency of 1.5/HZ.
5674 if (unlikely(budget
<= 0 ||
5675 time_after_eq(jiffies
, time_limit
))) {
5681 local_irq_disable();
5683 list_splice_tail_init(&sd
->poll_list
, &list
);
5684 list_splice_tail(&repoll
, &list
);
5685 list_splice(&list
, &sd
->poll_list
);
5686 if (!list_empty(&sd
->poll_list
))
5687 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
5689 net_rps_action_and_irq_enable(sd
);
5691 __kfree_skb_flush();
5694 struct netdev_adjacent
{
5695 struct net_device
*dev
;
5697 /* upper master flag, there can only be one master device per list */
5700 /* counter for the number of times this device was added to us */
5703 /* private field for the users */
5706 struct list_head list
;
5707 struct rcu_head rcu
;
5710 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*adj_dev
,
5711 struct list_head
*adj_list
)
5713 struct netdev_adjacent
*adj
;
5715 list_for_each_entry(adj
, adj_list
, list
) {
5716 if (adj
->dev
== adj_dev
)
5722 static int __netdev_has_upper_dev(struct net_device
*upper_dev
, void *data
)
5724 struct net_device
*dev
= data
;
5726 return upper_dev
== dev
;
5730 * netdev_has_upper_dev - Check if device is linked to an upper device
5732 * @upper_dev: upper device to check
5734 * Find out if a device is linked to specified upper device and return true
5735 * in case it is. Note that this checks only immediate upper device,
5736 * not through a complete stack of devices. The caller must hold the RTNL lock.
5738 bool netdev_has_upper_dev(struct net_device
*dev
,
5739 struct net_device
*upper_dev
)
5743 return netdev_walk_all_upper_dev_rcu(dev
, __netdev_has_upper_dev
,
5746 EXPORT_SYMBOL(netdev_has_upper_dev
);
5749 * netdev_has_upper_dev_all - Check if device is linked to an upper device
5751 * @upper_dev: upper device to check
5753 * Find out if a device is linked to specified upper device and return true
5754 * in case it is. Note that this checks the entire upper device chain.
5755 * The caller must hold rcu lock.
5758 bool netdev_has_upper_dev_all_rcu(struct net_device
*dev
,
5759 struct net_device
*upper_dev
)
5761 return !!netdev_walk_all_upper_dev_rcu(dev
, __netdev_has_upper_dev
,
5764 EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu
);
5767 * netdev_has_any_upper_dev - Check if device is linked to some device
5770 * Find out if a device is linked to an upper device and return true in case
5771 * it is. The caller must hold the RTNL lock.
5773 bool netdev_has_any_upper_dev(struct net_device
*dev
)
5777 return !list_empty(&dev
->adj_list
.upper
);
5779 EXPORT_SYMBOL(netdev_has_any_upper_dev
);
5782 * netdev_master_upper_dev_get - Get master upper device
5785 * Find a master upper device and return pointer to it or NULL in case
5786 * it's not there. The caller must hold the RTNL lock.
5788 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
5790 struct netdev_adjacent
*upper
;
5794 if (list_empty(&dev
->adj_list
.upper
))
5797 upper
= list_first_entry(&dev
->adj_list
.upper
,
5798 struct netdev_adjacent
, list
);
5799 if (likely(upper
->master
))
5803 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
5806 * netdev_has_any_lower_dev - Check if device is linked to some device
5809 * Find out if a device is linked to a lower device and return true in case
5810 * it is. The caller must hold the RTNL lock.
5812 static bool netdev_has_any_lower_dev(struct net_device
*dev
)
5816 return !list_empty(&dev
->adj_list
.lower
);
5819 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
5821 struct netdev_adjacent
*adj
;
5823 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
5825 return adj
->private;
5827 EXPORT_SYMBOL(netdev_adjacent_get_private
);
5830 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
5832 * @iter: list_head ** of the current position
5834 * Gets the next device from the dev's upper list, starting from iter
5835 * position. The caller must hold RCU read lock.
5837 struct net_device
*netdev_upper_get_next_dev_rcu(struct net_device
*dev
,
5838 struct list_head
**iter
)
5840 struct netdev_adjacent
*upper
;
5842 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5844 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5846 if (&upper
->list
== &dev
->adj_list
.upper
)
5849 *iter
= &upper
->list
;
5853 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu
);
5855 static struct net_device
*netdev_next_upper_dev_rcu(struct net_device
*dev
,
5856 struct list_head
**iter
)
5858 struct netdev_adjacent
*upper
;
5860 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5862 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5864 if (&upper
->list
== &dev
->adj_list
.upper
)
5867 *iter
= &upper
->list
;
5872 int netdev_walk_all_upper_dev_rcu(struct net_device
*dev
,
5873 int (*fn
)(struct net_device
*dev
,
5877 struct net_device
*udev
;
5878 struct list_head
*iter
;
5881 for (iter
= &dev
->adj_list
.upper
,
5882 udev
= netdev_next_upper_dev_rcu(dev
, &iter
);
5884 udev
= netdev_next_upper_dev_rcu(dev
, &iter
)) {
5885 /* first is the upper device itself */
5886 ret
= fn(udev
, data
);
5890 /* then look at all of its upper devices */
5891 ret
= netdev_walk_all_upper_dev_rcu(udev
, fn
, data
);
5898 EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu
);
5901 * netdev_lower_get_next_private - Get the next ->private from the
5902 * lower neighbour list
5904 * @iter: list_head ** of the current position
5906 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5907 * list, starting from iter position. The caller must hold either hold the
5908 * RTNL lock or its own locking that guarantees that the neighbour lower
5909 * list will remain unchanged.
5911 void *netdev_lower_get_next_private(struct net_device
*dev
,
5912 struct list_head
**iter
)
5914 struct netdev_adjacent
*lower
;
5916 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
5918 if (&lower
->list
== &dev
->adj_list
.lower
)
5921 *iter
= lower
->list
.next
;
5923 return lower
->private;
5925 EXPORT_SYMBOL(netdev_lower_get_next_private
);
5928 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5929 * lower neighbour list, RCU
5932 * @iter: list_head ** of the current position
5934 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5935 * list, starting from iter position. The caller must hold RCU read lock.
5937 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
5938 struct list_head
**iter
)
5940 struct netdev_adjacent
*lower
;
5942 WARN_ON_ONCE(!rcu_read_lock_held());
5944 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5946 if (&lower
->list
== &dev
->adj_list
.lower
)
5949 *iter
= &lower
->list
;
5951 return lower
->private;
5953 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
5956 * netdev_lower_get_next - Get the next device from the lower neighbour
5959 * @iter: list_head ** of the current position
5961 * Gets the next netdev_adjacent from the dev's lower neighbour
5962 * list, starting from iter position. The caller must hold RTNL lock or
5963 * its own locking that guarantees that the neighbour lower
5964 * list will remain unchanged.
5966 void *netdev_lower_get_next(struct net_device
*dev
, struct list_head
**iter
)
5968 struct netdev_adjacent
*lower
;
5970 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
5972 if (&lower
->list
== &dev
->adj_list
.lower
)
5975 *iter
= lower
->list
.next
;
5979 EXPORT_SYMBOL(netdev_lower_get_next
);
5981 static struct net_device
*netdev_next_lower_dev(struct net_device
*dev
,
5982 struct list_head
**iter
)
5984 struct netdev_adjacent
*lower
;
5986 lower
= list_entry((*iter
)->next
, struct netdev_adjacent
, list
);
5988 if (&lower
->list
== &dev
->adj_list
.lower
)
5991 *iter
= &lower
->list
;
5996 int netdev_walk_all_lower_dev(struct net_device
*dev
,
5997 int (*fn
)(struct net_device
*dev
,
6001 struct net_device
*ldev
;
6002 struct list_head
*iter
;
6005 for (iter
= &dev
->adj_list
.lower
,
6006 ldev
= netdev_next_lower_dev(dev
, &iter
);
6008 ldev
= netdev_next_lower_dev(dev
, &iter
)) {
6009 /* first is the lower device itself */
6010 ret
= fn(ldev
, data
);
6014 /* then look at all of its lower devices */
6015 ret
= netdev_walk_all_lower_dev(ldev
, fn
, data
);
6022 EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev
);
6024 static struct net_device
*netdev_next_lower_dev_rcu(struct net_device
*dev
,
6025 struct list_head
**iter
)
6027 struct netdev_adjacent
*lower
;
6029 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
6030 if (&lower
->list
== &dev
->adj_list
.lower
)
6033 *iter
= &lower
->list
;
6038 int netdev_walk_all_lower_dev_rcu(struct net_device
*dev
,
6039 int (*fn
)(struct net_device
*dev
,
6043 struct net_device
*ldev
;
6044 struct list_head
*iter
;
6047 for (iter
= &dev
->adj_list
.lower
,
6048 ldev
= netdev_next_lower_dev_rcu(dev
, &iter
);
6050 ldev
= netdev_next_lower_dev_rcu(dev
, &iter
)) {
6051 /* first is the lower device itself */
6052 ret
= fn(ldev
, data
);
6056 /* then look at all of its lower devices */
6057 ret
= netdev_walk_all_lower_dev_rcu(ldev
, fn
, data
);
6064 EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu
);
6067 * netdev_lower_get_first_private_rcu - Get the first ->private from the
6068 * lower neighbour list, RCU
6072 * Gets the first netdev_adjacent->private from the dev's lower neighbour
6073 * list. The caller must hold RCU read lock.
6075 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
6077 struct netdev_adjacent
*lower
;
6079 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
6080 struct netdev_adjacent
, list
);
6082 return lower
->private;
6085 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
6088 * netdev_master_upper_dev_get_rcu - Get master upper device
6091 * Find a master upper device and return pointer to it or NULL in case
6092 * it's not there. The caller must hold the RCU read lock.
6094 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
6096 struct netdev_adjacent
*upper
;
6098 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
6099 struct netdev_adjacent
, list
);
6100 if (upper
&& likely(upper
->master
))
6104 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
6106 static int netdev_adjacent_sysfs_add(struct net_device
*dev
,
6107 struct net_device
*adj_dev
,
6108 struct list_head
*dev_list
)
6110 char linkname
[IFNAMSIZ
+7];
6112 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
6113 "upper_%s" : "lower_%s", adj_dev
->name
);
6114 return sysfs_create_link(&(dev
->dev
.kobj
), &(adj_dev
->dev
.kobj
),
6117 static void netdev_adjacent_sysfs_del(struct net_device
*dev
,
6119 struct list_head
*dev_list
)
6121 char linkname
[IFNAMSIZ
+7];
6123 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
6124 "upper_%s" : "lower_%s", name
);
6125 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
6128 static inline bool netdev_adjacent_is_neigh_list(struct net_device
*dev
,
6129 struct net_device
*adj_dev
,
6130 struct list_head
*dev_list
)
6132 return (dev_list
== &dev
->adj_list
.upper
||
6133 dev_list
== &dev
->adj_list
.lower
) &&
6134 net_eq(dev_net(dev
), dev_net(adj_dev
));
6137 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
6138 struct net_device
*adj_dev
,
6139 struct list_head
*dev_list
,
6140 void *private, bool master
)
6142 struct netdev_adjacent
*adj
;
6145 adj
= __netdev_find_adj(adj_dev
, dev_list
);
6149 pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n",
6150 dev
->name
, adj_dev
->name
, adj
->ref_nr
);
6155 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
6160 adj
->master
= master
;
6162 adj
->private = private;
6165 pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n",
6166 dev
->name
, adj_dev
->name
, adj
->ref_nr
, adj_dev
->name
);
6168 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
)) {
6169 ret
= netdev_adjacent_sysfs_add(dev
, adj_dev
, dev_list
);
6174 /* Ensure that master link is always the first item in list. */
6176 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
6177 &(adj_dev
->dev
.kobj
), "master");
6179 goto remove_symlinks
;
6181 list_add_rcu(&adj
->list
, dev_list
);
6183 list_add_tail_rcu(&adj
->list
, dev_list
);
6189 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
6190 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
6198 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
6199 struct net_device
*adj_dev
,
6201 struct list_head
*dev_list
)
6203 struct netdev_adjacent
*adj
;
6205 pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n",
6206 dev
->name
, adj_dev
->name
, ref_nr
);
6208 adj
= __netdev_find_adj(adj_dev
, dev_list
);
6211 pr_err("Adjacency does not exist for device %s from %s\n",
6212 dev
->name
, adj_dev
->name
);
6217 if (adj
->ref_nr
> ref_nr
) {
6218 pr_debug("adjacency: %s to %s ref_nr - %d = %d\n",
6219 dev
->name
, adj_dev
->name
, ref_nr
,
6220 adj
->ref_nr
- ref_nr
);
6221 adj
->ref_nr
-= ref_nr
;
6226 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
6228 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
6229 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
6231 list_del_rcu(&adj
->list
);
6232 pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n",
6233 adj_dev
->name
, dev
->name
, adj_dev
->name
);
6235 kfree_rcu(adj
, rcu
);
6238 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
6239 struct net_device
*upper_dev
,
6240 struct list_head
*up_list
,
6241 struct list_head
*down_list
,
6242 void *private, bool master
)
6246 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
,
6251 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
,
6254 __netdev_adjacent_dev_remove(dev
, upper_dev
, 1, up_list
);
6261 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
6262 struct net_device
*upper_dev
,
6264 struct list_head
*up_list
,
6265 struct list_head
*down_list
)
6267 __netdev_adjacent_dev_remove(dev
, upper_dev
, ref_nr
, up_list
);
6268 __netdev_adjacent_dev_remove(upper_dev
, dev
, ref_nr
, down_list
);
6271 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
6272 struct net_device
*upper_dev
,
6273 void *private, bool master
)
6275 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
6276 &dev
->adj_list
.upper
,
6277 &upper_dev
->adj_list
.lower
,
6281 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
6282 struct net_device
*upper_dev
)
6284 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
, 1,
6285 &dev
->adj_list
.upper
,
6286 &upper_dev
->adj_list
.lower
);
6289 static int __netdev_upper_dev_link(struct net_device
*dev
,
6290 struct net_device
*upper_dev
, bool master
,
6291 void *upper_priv
, void *upper_info
,
6292 struct netlink_ext_ack
*extack
)
6294 struct netdev_notifier_changeupper_info changeupper_info
= {
6299 .upper_dev
= upper_dev
,
6302 .upper_info
= upper_info
,
6308 if (dev
== upper_dev
)
6311 /* To prevent loops, check if dev is not upper device to upper_dev. */
6312 if (netdev_has_upper_dev(upper_dev
, dev
))
6315 if (netdev_has_upper_dev(dev
, upper_dev
))
6318 if (master
&& netdev_master_upper_dev_get(dev
))
6321 ret
= call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER
,
6322 &changeupper_info
.info
);
6323 ret
= notifier_to_errno(ret
);
6327 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, upper_priv
,
6332 ret
= call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
,
6333 &changeupper_info
.info
);
6334 ret
= notifier_to_errno(ret
);
6341 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
6347 * netdev_upper_dev_link - Add a link to the upper device
6349 * @upper_dev: new upper device
6351 * Adds a link to device which is upper to this one. The caller must hold
6352 * the RTNL lock. On a failure a negative errno code is returned.
6353 * On success the reference counts are adjusted and the function
6356 int netdev_upper_dev_link(struct net_device
*dev
,
6357 struct net_device
*upper_dev
,
6358 struct netlink_ext_ack
*extack
)
6360 return __netdev_upper_dev_link(dev
, upper_dev
, false,
6361 NULL
, NULL
, extack
);
6363 EXPORT_SYMBOL(netdev_upper_dev_link
);
6366 * netdev_master_upper_dev_link - Add a master link to the upper device
6368 * @upper_dev: new upper device
6369 * @upper_priv: upper device private
6370 * @upper_info: upper info to be passed down via notifier
6372 * Adds a link to device which is upper to this one. In this case, only
6373 * one master upper device can be linked, although other non-master devices
6374 * might be linked as well. The caller must hold the RTNL lock.
6375 * On a failure a negative errno code is returned. On success the reference
6376 * counts are adjusted and the function returns zero.
6378 int netdev_master_upper_dev_link(struct net_device
*dev
,
6379 struct net_device
*upper_dev
,
6380 void *upper_priv
, void *upper_info
,
6381 struct netlink_ext_ack
*extack
)
6383 return __netdev_upper_dev_link(dev
, upper_dev
, true,
6384 upper_priv
, upper_info
, extack
);
6386 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
6389 * netdev_upper_dev_unlink - Removes a link to upper device
6391 * @upper_dev: new upper device
6393 * Removes a link to device which is upper to this one. The caller must hold
6396 void netdev_upper_dev_unlink(struct net_device
*dev
,
6397 struct net_device
*upper_dev
)
6399 struct netdev_notifier_changeupper_info changeupper_info
= {
6403 .upper_dev
= upper_dev
,
6409 changeupper_info
.master
= netdev_master_upper_dev_get(dev
) == upper_dev
;
6411 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER
,
6412 &changeupper_info
.info
);
6414 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
6416 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
,
6417 &changeupper_info
.info
);
6419 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
6422 * netdev_bonding_info_change - Dispatch event about slave change
6424 * @bonding_info: info to dispatch
6426 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
6427 * The caller must hold the RTNL lock.
6429 void netdev_bonding_info_change(struct net_device
*dev
,
6430 struct netdev_bonding_info
*bonding_info
)
6432 struct netdev_notifier_bonding_info info
= {
6436 memcpy(&info
.bonding_info
, bonding_info
,
6437 sizeof(struct netdev_bonding_info
));
6438 call_netdevice_notifiers_info(NETDEV_BONDING_INFO
,
6441 EXPORT_SYMBOL(netdev_bonding_info_change
);
6443 static void netdev_adjacent_add_links(struct net_device
*dev
)
6445 struct netdev_adjacent
*iter
;
6447 struct net
*net
= dev_net(dev
);
6449 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
6450 if (!net_eq(net
, dev_net(iter
->dev
)))
6452 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
6453 &iter
->dev
->adj_list
.lower
);
6454 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
6455 &dev
->adj_list
.upper
);
6458 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
6459 if (!net_eq(net
, dev_net(iter
->dev
)))
6461 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
6462 &iter
->dev
->adj_list
.upper
);
6463 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
6464 &dev
->adj_list
.lower
);
6468 static void netdev_adjacent_del_links(struct net_device
*dev
)
6470 struct netdev_adjacent
*iter
;
6472 struct net
*net
= dev_net(dev
);
6474 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
6475 if (!net_eq(net
, dev_net(iter
->dev
)))
6477 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
6478 &iter
->dev
->adj_list
.lower
);
6479 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
6480 &dev
->adj_list
.upper
);
6483 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
6484 if (!net_eq(net
, dev_net(iter
->dev
)))
6486 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
6487 &iter
->dev
->adj_list
.upper
);
6488 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
6489 &dev
->adj_list
.lower
);
6493 void netdev_adjacent_rename_links(struct net_device
*dev
, char *oldname
)
6495 struct netdev_adjacent
*iter
;
6497 struct net
*net
= dev_net(dev
);
6499 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
6500 if (!net_eq(net
, dev_net(iter
->dev
)))
6502 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
6503 &iter
->dev
->adj_list
.lower
);
6504 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
6505 &iter
->dev
->adj_list
.lower
);
6508 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
6509 if (!net_eq(net
, dev_net(iter
->dev
)))
6511 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
6512 &iter
->dev
->adj_list
.upper
);
6513 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
6514 &iter
->dev
->adj_list
.upper
);
6518 void *netdev_lower_dev_get_private(struct net_device
*dev
,
6519 struct net_device
*lower_dev
)
6521 struct netdev_adjacent
*lower
;
6525 lower
= __netdev_find_adj(lower_dev
, &dev
->adj_list
.lower
);
6529 return lower
->private;
6531 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
6534 int dev_get_nest_level(struct net_device
*dev
)
6536 struct net_device
*lower
= NULL
;
6537 struct list_head
*iter
;
6543 netdev_for_each_lower_dev(dev
, lower
, iter
) {
6544 nest
= dev_get_nest_level(lower
);
6545 if (max_nest
< nest
)
6549 return max_nest
+ 1;
6551 EXPORT_SYMBOL(dev_get_nest_level
);
6554 * netdev_lower_change - Dispatch event about lower device state change
6555 * @lower_dev: device
6556 * @lower_state_info: state to dispatch
6558 * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
6559 * The caller must hold the RTNL lock.
6561 void netdev_lower_state_changed(struct net_device
*lower_dev
,
6562 void *lower_state_info
)
6564 struct netdev_notifier_changelowerstate_info changelowerstate_info
= {
6565 .info
.dev
= lower_dev
,
6569 changelowerstate_info
.lower_state_info
= lower_state_info
;
6570 call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE
,
6571 &changelowerstate_info
.info
);
6573 EXPORT_SYMBOL(netdev_lower_state_changed
);
6575 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
6577 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6579 if (ops
->ndo_change_rx_flags
)
6580 ops
->ndo_change_rx_flags(dev
, flags
);
6583 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
6585 unsigned int old_flags
= dev
->flags
;
6591 dev
->flags
|= IFF_PROMISC
;
6592 dev
->promiscuity
+= inc
;
6593 if (dev
->promiscuity
== 0) {
6596 * If inc causes overflow, untouch promisc and return error.
6599 dev
->flags
&= ~IFF_PROMISC
;
6601 dev
->promiscuity
-= inc
;
6602 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
6607 if (dev
->flags
!= old_flags
) {
6608 pr_info("device %s %s promiscuous mode\n",
6610 dev
->flags
& IFF_PROMISC
? "entered" : "left");
6611 if (audit_enabled
) {
6612 current_uid_gid(&uid
, &gid
);
6613 audit_log(current
->audit_context
, GFP_ATOMIC
,
6614 AUDIT_ANOM_PROMISCUOUS
,
6615 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
6616 dev
->name
, (dev
->flags
& IFF_PROMISC
),
6617 (old_flags
& IFF_PROMISC
),
6618 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
6619 from_kuid(&init_user_ns
, uid
),
6620 from_kgid(&init_user_ns
, gid
),
6621 audit_get_sessionid(current
));
6624 dev_change_rx_flags(dev
, IFF_PROMISC
);
6627 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
6632 * dev_set_promiscuity - update promiscuity count on a device
6636 * Add or remove promiscuity from a device. While the count in the device
6637 * remains above zero the interface remains promiscuous. Once it hits zero
6638 * the device reverts back to normal filtering operation. A negative inc
6639 * value is used to drop promiscuity on the device.
6640 * Return 0 if successful or a negative errno code on error.
6642 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
6644 unsigned int old_flags
= dev
->flags
;
6647 err
= __dev_set_promiscuity(dev
, inc
, true);
6650 if (dev
->flags
!= old_flags
)
6651 dev_set_rx_mode(dev
);
6654 EXPORT_SYMBOL(dev_set_promiscuity
);
6656 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
6658 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
6662 dev
->flags
|= IFF_ALLMULTI
;
6663 dev
->allmulti
+= inc
;
6664 if (dev
->allmulti
== 0) {
6667 * If inc causes overflow, untouch allmulti and return error.
6670 dev
->flags
&= ~IFF_ALLMULTI
;
6672 dev
->allmulti
-= inc
;
6673 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
6678 if (dev
->flags
^ old_flags
) {
6679 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
6680 dev_set_rx_mode(dev
);
6682 __dev_notify_flags(dev
, old_flags
,
6683 dev
->gflags
^ old_gflags
);
6689 * dev_set_allmulti - update allmulti count on a device
6693 * Add or remove reception of all multicast frames to a device. While the
6694 * count in the device remains above zero the interface remains listening
6695 * to all interfaces. Once it hits zero the device reverts back to normal
6696 * filtering operation. A negative @inc value is used to drop the counter
6697 * when releasing a resource needing all multicasts.
6698 * Return 0 if successful or a negative errno code on error.
6701 int dev_set_allmulti(struct net_device
*dev
, int inc
)
6703 return __dev_set_allmulti(dev
, inc
, true);
6705 EXPORT_SYMBOL(dev_set_allmulti
);
6708 * Upload unicast and multicast address lists to device and
6709 * configure RX filtering. When the device doesn't support unicast
6710 * filtering it is put in promiscuous mode while unicast addresses
6713 void __dev_set_rx_mode(struct net_device
*dev
)
6715 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6717 /* dev_open will call this function so the list will stay sane. */
6718 if (!(dev
->flags
&IFF_UP
))
6721 if (!netif_device_present(dev
))
6724 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
6725 /* Unicast addresses changes may only happen under the rtnl,
6726 * therefore calling __dev_set_promiscuity here is safe.
6728 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
6729 __dev_set_promiscuity(dev
, 1, false);
6730 dev
->uc_promisc
= true;
6731 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
6732 __dev_set_promiscuity(dev
, -1, false);
6733 dev
->uc_promisc
= false;
6737 if (ops
->ndo_set_rx_mode
)
6738 ops
->ndo_set_rx_mode(dev
);
6741 void dev_set_rx_mode(struct net_device
*dev
)
6743 netif_addr_lock_bh(dev
);
6744 __dev_set_rx_mode(dev
);
6745 netif_addr_unlock_bh(dev
);
6749 * dev_get_flags - get flags reported to userspace
6752 * Get the combination of flag bits exported through APIs to userspace.
6754 unsigned int dev_get_flags(const struct net_device
*dev
)
6758 flags
= (dev
->flags
& ~(IFF_PROMISC
|
6763 (dev
->gflags
& (IFF_PROMISC
|
6766 if (netif_running(dev
)) {
6767 if (netif_oper_up(dev
))
6768 flags
|= IFF_RUNNING
;
6769 if (netif_carrier_ok(dev
))
6770 flags
|= IFF_LOWER_UP
;
6771 if (netif_dormant(dev
))
6772 flags
|= IFF_DORMANT
;
6777 EXPORT_SYMBOL(dev_get_flags
);
6779 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
6781 unsigned int old_flags
= dev
->flags
;
6787 * Set the flags on our device.
6790 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
6791 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
6793 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
6797 * Load in the correct multicast list now the flags have changed.
6800 if ((old_flags
^ flags
) & IFF_MULTICAST
)
6801 dev_change_rx_flags(dev
, IFF_MULTICAST
);
6803 dev_set_rx_mode(dev
);
6806 * Have we downed the interface. We handle IFF_UP ourselves
6807 * according to user attempts to set it, rather than blindly
6812 if ((old_flags
^ flags
) & IFF_UP
) {
6813 if (old_flags
& IFF_UP
)
6816 ret
= __dev_open(dev
);
6819 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
6820 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
6821 unsigned int old_flags
= dev
->flags
;
6823 dev
->gflags
^= IFF_PROMISC
;
6825 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
6826 if (dev
->flags
!= old_flags
)
6827 dev_set_rx_mode(dev
);
6830 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
6831 * is important. Some (broken) drivers set IFF_PROMISC, when
6832 * IFF_ALLMULTI is requested not asking us and not reporting.
6834 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
6835 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
6837 dev
->gflags
^= IFF_ALLMULTI
;
6838 __dev_set_allmulti(dev
, inc
, false);
6844 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
6845 unsigned int gchanges
)
6847 unsigned int changes
= dev
->flags
^ old_flags
;
6850 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
6852 if (changes
& IFF_UP
) {
6853 if (dev
->flags
& IFF_UP
)
6854 call_netdevice_notifiers(NETDEV_UP
, dev
);
6856 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
6859 if (dev
->flags
& IFF_UP
&&
6860 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
6861 struct netdev_notifier_change_info change_info
= {
6865 .flags_changed
= changes
,
6868 call_netdevice_notifiers_info(NETDEV_CHANGE
, &change_info
.info
);
6873 * dev_change_flags - change device settings
6875 * @flags: device state flags
6877 * Change settings on device based state flags. The flags are
6878 * in the userspace exported format.
6880 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
6883 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
6885 ret
= __dev_change_flags(dev
, flags
);
6889 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
6890 __dev_notify_flags(dev
, old_flags
, changes
);
6893 EXPORT_SYMBOL(dev_change_flags
);
6895 int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
6897 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6899 if (ops
->ndo_change_mtu
)
6900 return ops
->ndo_change_mtu(dev
, new_mtu
);
6905 EXPORT_SYMBOL(__dev_set_mtu
);
6908 * dev_set_mtu - Change maximum transfer unit
6910 * @new_mtu: new transfer unit
6912 * Change the maximum transfer size of the network device.
6914 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
6918 if (new_mtu
== dev
->mtu
)
6921 /* MTU must be positive, and in range */
6922 if (new_mtu
< 0 || new_mtu
< dev
->min_mtu
) {
6923 net_err_ratelimited("%s: Invalid MTU %d requested, hw min %d\n",
6924 dev
->name
, new_mtu
, dev
->min_mtu
);
6928 if (dev
->max_mtu
> 0 && new_mtu
> dev
->max_mtu
) {
6929 net_err_ratelimited("%s: Invalid MTU %d requested, hw max %d\n",
6930 dev
->name
, new_mtu
, dev
->max_mtu
);
6934 if (!netif_device_present(dev
))
6937 err
= call_netdevice_notifiers(NETDEV_PRECHANGEMTU
, dev
);
6938 err
= notifier_to_errno(err
);
6942 orig_mtu
= dev
->mtu
;
6943 err
= __dev_set_mtu(dev
, new_mtu
);
6946 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6947 err
= notifier_to_errno(err
);
6949 /* setting mtu back and notifying everyone again,
6950 * so that they have a chance to revert changes.
6952 __dev_set_mtu(dev
, orig_mtu
);
6953 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6958 EXPORT_SYMBOL(dev_set_mtu
);
6961 * dev_set_group - Change group this device belongs to
6963 * @new_group: group this device should belong to
6965 void dev_set_group(struct net_device
*dev
, int new_group
)
6967 dev
->group
= new_group
;
6969 EXPORT_SYMBOL(dev_set_group
);
6972 * dev_set_mac_address - Change Media Access Control Address
6976 * Change the hardware (MAC) address of the device
6978 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
6980 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6983 if (!ops
->ndo_set_mac_address
)
6985 if (sa
->sa_family
!= dev
->type
)
6987 if (!netif_device_present(dev
))
6989 err
= ops
->ndo_set_mac_address(dev
, sa
);
6992 dev
->addr_assign_type
= NET_ADDR_SET
;
6993 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
6994 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6997 EXPORT_SYMBOL(dev_set_mac_address
);
7000 * dev_change_carrier - Change device carrier
7002 * @new_carrier: new value
7004 * Change device carrier
7006 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
7008 const struct net_device_ops
*ops
= dev
->netdev_ops
;
7010 if (!ops
->ndo_change_carrier
)
7012 if (!netif_device_present(dev
))
7014 return ops
->ndo_change_carrier(dev
, new_carrier
);
7016 EXPORT_SYMBOL(dev_change_carrier
);
7019 * dev_get_phys_port_id - Get device physical port ID
7023 * Get device physical port ID
7025 int dev_get_phys_port_id(struct net_device
*dev
,
7026 struct netdev_phys_item_id
*ppid
)
7028 const struct net_device_ops
*ops
= dev
->netdev_ops
;
7030 if (!ops
->ndo_get_phys_port_id
)
7032 return ops
->ndo_get_phys_port_id(dev
, ppid
);
7034 EXPORT_SYMBOL(dev_get_phys_port_id
);
7037 * dev_get_phys_port_name - Get device physical port name
7040 * @len: limit of bytes to copy to name
7042 * Get device physical port name
7044 int dev_get_phys_port_name(struct net_device
*dev
,
7045 char *name
, size_t len
)
7047 const struct net_device_ops
*ops
= dev
->netdev_ops
;
7049 if (!ops
->ndo_get_phys_port_name
)
7051 return ops
->ndo_get_phys_port_name(dev
, name
, len
);
7053 EXPORT_SYMBOL(dev_get_phys_port_name
);
7056 * dev_change_proto_down - update protocol port state information
7058 * @proto_down: new value
7060 * This info can be used by switch drivers to set the phys state of the
7063 int dev_change_proto_down(struct net_device
*dev
, bool proto_down
)
7065 const struct net_device_ops
*ops
= dev
->netdev_ops
;
7067 if (!ops
->ndo_change_proto_down
)
7069 if (!netif_device_present(dev
))
7071 return ops
->ndo_change_proto_down(dev
, proto_down
);
7073 EXPORT_SYMBOL(dev_change_proto_down
);
7075 u8
__dev_xdp_attached(struct net_device
*dev
, bpf_op_t bpf_op
, u32
*prog_id
)
7077 struct netdev_bpf xdp
;
7079 memset(&xdp
, 0, sizeof(xdp
));
7080 xdp
.command
= XDP_QUERY_PROG
;
7082 /* Query must always succeed. */
7083 WARN_ON(bpf_op(dev
, &xdp
) < 0);
7085 *prog_id
= xdp
.prog_id
;
7087 return xdp
.prog_attached
;
7090 static int dev_xdp_install(struct net_device
*dev
, bpf_op_t bpf_op
,
7091 struct netlink_ext_ack
*extack
, u32 flags
,
7092 struct bpf_prog
*prog
)
7094 struct netdev_bpf xdp
;
7096 memset(&xdp
, 0, sizeof(xdp
));
7097 if (flags
& XDP_FLAGS_HW_MODE
)
7098 xdp
.command
= XDP_SETUP_PROG_HW
;
7100 xdp
.command
= XDP_SETUP_PROG
;
7101 xdp
.extack
= extack
;
7105 return bpf_op(dev
, &xdp
);
7109 * dev_change_xdp_fd - set or clear a bpf program for a device rx path
7111 * @extack: netlink extended ack
7112 * @fd: new program fd or negative value to clear
7113 * @flags: xdp-related flags
7115 * Set or clear a bpf program for a device
7117 int dev_change_xdp_fd(struct net_device
*dev
, struct netlink_ext_ack
*extack
,
7120 const struct net_device_ops
*ops
= dev
->netdev_ops
;
7121 struct bpf_prog
*prog
= NULL
;
7122 bpf_op_t bpf_op
, bpf_chk
;
7127 bpf_op
= bpf_chk
= ops
->ndo_bpf
;
7128 if (!bpf_op
&& (flags
& (XDP_FLAGS_DRV_MODE
| XDP_FLAGS_HW_MODE
)))
7130 if (!bpf_op
|| (flags
& XDP_FLAGS_SKB_MODE
))
7131 bpf_op
= generic_xdp_install
;
7132 if (bpf_op
== bpf_chk
)
7133 bpf_chk
= generic_xdp_install
;
7136 if (bpf_chk
&& __dev_xdp_attached(dev
, bpf_chk
, NULL
))
7138 if ((flags
& XDP_FLAGS_UPDATE_IF_NOEXIST
) &&
7139 __dev_xdp_attached(dev
, bpf_op
, NULL
))
7142 if (bpf_op
== ops
->ndo_bpf
)
7143 prog
= bpf_prog_get_type_dev(fd
, BPF_PROG_TYPE_XDP
,
7146 prog
= bpf_prog_get_type(fd
, BPF_PROG_TYPE_XDP
);
7148 return PTR_ERR(prog
);
7151 err
= dev_xdp_install(dev
, bpf_op
, extack
, flags
, prog
);
7152 if (err
< 0 && prog
)
7159 * dev_new_index - allocate an ifindex
7160 * @net: the applicable net namespace
7162 * Returns a suitable unique value for a new device interface
7163 * number. The caller must hold the rtnl semaphore or the
7164 * dev_base_lock to be sure it remains unique.
7166 static int dev_new_index(struct net
*net
)
7168 int ifindex
= net
->ifindex
;
7173 if (!__dev_get_by_index(net
, ifindex
))
7174 return net
->ifindex
= ifindex
;
7178 /* Delayed registration/unregisteration */
7179 static LIST_HEAD(net_todo_list
);
7180 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
7182 static void net_set_todo(struct net_device
*dev
)
7184 list_add_tail(&dev
->todo_list
, &net_todo_list
);
7185 dev_net(dev
)->dev_unreg_count
++;
7188 static void rollback_registered_many(struct list_head
*head
)
7190 struct net_device
*dev
, *tmp
;
7191 LIST_HEAD(close_head
);
7193 BUG_ON(dev_boot_phase
);
7196 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
7197 /* Some devices call without registering
7198 * for initialization unwind. Remove those
7199 * devices and proceed with the remaining.
7201 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
7202 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
7206 list_del(&dev
->unreg_list
);
7209 dev
->dismantle
= true;
7210 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
7213 /* If device is running, close it first. */
7214 list_for_each_entry(dev
, head
, unreg_list
)
7215 list_add_tail(&dev
->close_list
, &close_head
);
7216 dev_close_many(&close_head
, true);
7218 list_for_each_entry(dev
, head
, unreg_list
) {
7219 /* And unlink it from device chain. */
7220 unlist_netdevice(dev
);
7222 dev
->reg_state
= NETREG_UNREGISTERING
;
7224 flush_all_backlogs();
7228 list_for_each_entry(dev
, head
, unreg_list
) {
7229 struct sk_buff
*skb
= NULL
;
7231 /* Shutdown queueing discipline. */
7235 /* Notify protocols, that we are about to destroy
7236 * this device. They should clean all the things.
7238 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
7240 if (!dev
->rtnl_link_ops
||
7241 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
7242 skb
= rtmsg_ifinfo_build_skb(RTM_DELLINK
, dev
, ~0U, 0,
7246 * Flush the unicast and multicast chains
7251 if (dev
->netdev_ops
->ndo_uninit
)
7252 dev
->netdev_ops
->ndo_uninit(dev
);
7255 rtmsg_ifinfo_send(skb
, dev
, GFP_KERNEL
);
7257 /* Notifier chain MUST detach us all upper devices. */
7258 WARN_ON(netdev_has_any_upper_dev(dev
));
7259 WARN_ON(netdev_has_any_lower_dev(dev
));
7261 /* Remove entries from kobject tree */
7262 netdev_unregister_kobject(dev
);
7264 /* Remove XPS queueing entries */
7265 netif_reset_xps_queues_gt(dev
, 0);
7271 list_for_each_entry(dev
, head
, unreg_list
)
7275 static void rollback_registered(struct net_device
*dev
)
7279 list_add(&dev
->unreg_list
, &single
);
7280 rollback_registered_many(&single
);
7284 static netdev_features_t
netdev_sync_upper_features(struct net_device
*lower
,
7285 struct net_device
*upper
, netdev_features_t features
)
7287 netdev_features_t upper_disables
= NETIF_F_UPPER_DISABLES
;
7288 netdev_features_t feature
;
7291 for_each_netdev_feature(&upper_disables
, feature_bit
) {
7292 feature
= __NETIF_F_BIT(feature_bit
);
7293 if (!(upper
->wanted_features
& feature
)
7294 && (features
& feature
)) {
7295 netdev_dbg(lower
, "Dropping feature %pNF, upper dev %s has it off.\n",
7296 &feature
, upper
->name
);
7297 features
&= ~feature
;
7304 static void netdev_sync_lower_features(struct net_device
*upper
,
7305 struct net_device
*lower
, netdev_features_t features
)
7307 netdev_features_t upper_disables
= NETIF_F_UPPER_DISABLES
;
7308 netdev_features_t feature
;
7311 for_each_netdev_feature(&upper_disables
, feature_bit
) {
7312 feature
= __NETIF_F_BIT(feature_bit
);
7313 if (!(features
& feature
) && (lower
->features
& feature
)) {
7314 netdev_dbg(upper
, "Disabling feature %pNF on lower dev %s.\n",
7315 &feature
, lower
->name
);
7316 lower
->wanted_features
&= ~feature
;
7317 netdev_update_features(lower
);
7319 if (unlikely(lower
->features
& feature
))
7320 netdev_WARN(upper
, "failed to disable %pNF on %s!\n",
7321 &feature
, lower
->name
);
7326 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
7327 netdev_features_t features
)
7329 /* Fix illegal checksum combinations */
7330 if ((features
& NETIF_F_HW_CSUM
) &&
7331 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
7332 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
7333 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
7336 /* TSO requires that SG is present as well. */
7337 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
7338 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
7339 features
&= ~NETIF_F_ALL_TSO
;
7342 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
7343 !(features
& NETIF_F_IP_CSUM
)) {
7344 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
7345 features
&= ~NETIF_F_TSO
;
7346 features
&= ~NETIF_F_TSO_ECN
;
7349 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
7350 !(features
& NETIF_F_IPV6_CSUM
)) {
7351 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
7352 features
&= ~NETIF_F_TSO6
;
7355 /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */
7356 if ((features
& NETIF_F_TSO_MANGLEID
) && !(features
& NETIF_F_TSO
))
7357 features
&= ~NETIF_F_TSO_MANGLEID
;
7359 /* TSO ECN requires that TSO is present as well. */
7360 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
7361 features
&= ~NETIF_F_TSO_ECN
;
7363 /* Software GSO depends on SG. */
7364 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
7365 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
7366 features
&= ~NETIF_F_GSO
;
7369 /* GSO partial features require GSO partial be set */
7370 if ((features
& dev
->gso_partial_features
) &&
7371 !(features
& NETIF_F_GSO_PARTIAL
)) {
7373 "Dropping partially supported GSO features since no GSO partial.\n");
7374 features
&= ~dev
->gso_partial_features
;
7380 int __netdev_update_features(struct net_device
*dev
)
7382 struct net_device
*upper
, *lower
;
7383 netdev_features_t features
;
7384 struct list_head
*iter
;
7389 features
= netdev_get_wanted_features(dev
);
7391 if (dev
->netdev_ops
->ndo_fix_features
)
7392 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
7394 /* driver might be less strict about feature dependencies */
7395 features
= netdev_fix_features(dev
, features
);
7397 /* some features can't be enabled if they're off an an upper device */
7398 netdev_for_each_upper_dev_rcu(dev
, upper
, iter
)
7399 features
= netdev_sync_upper_features(dev
, upper
, features
);
7401 if (dev
->features
== features
)
7404 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
7405 &dev
->features
, &features
);
7407 if (dev
->netdev_ops
->ndo_set_features
)
7408 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
7412 if (unlikely(err
< 0)) {
7414 "set_features() failed (%d); wanted %pNF, left %pNF\n",
7415 err
, &features
, &dev
->features
);
7416 /* return non-0 since some features might have changed and
7417 * it's better to fire a spurious notification than miss it
7423 /* some features must be disabled on lower devices when disabled
7424 * on an upper device (think: bonding master or bridge)
7426 netdev_for_each_lower_dev(dev
, lower
, iter
)
7427 netdev_sync_lower_features(dev
, lower
, features
);
7430 netdev_features_t diff
= features
^ dev
->features
;
7432 if (diff
& NETIF_F_RX_UDP_TUNNEL_PORT
) {
7433 /* udp_tunnel_{get,drop}_rx_info both need
7434 * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the
7435 * device, or they won't do anything.
7436 * Thus we need to update dev->features
7437 * *before* calling udp_tunnel_get_rx_info,
7438 * but *after* calling udp_tunnel_drop_rx_info.
7440 if (features
& NETIF_F_RX_UDP_TUNNEL_PORT
) {
7441 dev
->features
= features
;
7442 udp_tunnel_get_rx_info(dev
);
7444 udp_tunnel_drop_rx_info(dev
);
7448 dev
->features
= features
;
7451 return err
< 0 ? 0 : 1;
7455 * netdev_update_features - recalculate device features
7456 * @dev: the device to check
7458 * Recalculate dev->features set and send notifications if it
7459 * has changed. Should be called after driver or hardware dependent
7460 * conditions might have changed that influence the features.
7462 void netdev_update_features(struct net_device
*dev
)
7464 if (__netdev_update_features(dev
))
7465 netdev_features_change(dev
);
7467 EXPORT_SYMBOL(netdev_update_features
);
7470 * netdev_change_features - recalculate device features
7471 * @dev: the device to check
7473 * Recalculate dev->features set and send notifications even
7474 * if they have not changed. Should be called instead of
7475 * netdev_update_features() if also dev->vlan_features might
7476 * have changed to allow the changes to be propagated to stacked
7479 void netdev_change_features(struct net_device
*dev
)
7481 __netdev_update_features(dev
);
7482 netdev_features_change(dev
);
7484 EXPORT_SYMBOL(netdev_change_features
);
7487 * netif_stacked_transfer_operstate - transfer operstate
7488 * @rootdev: the root or lower level device to transfer state from
7489 * @dev: the device to transfer operstate to
7491 * Transfer operational state from root to device. This is normally
7492 * called when a stacking relationship exists between the root
7493 * device and the device(a leaf device).
7495 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
7496 struct net_device
*dev
)
7498 if (rootdev
->operstate
== IF_OPER_DORMANT
)
7499 netif_dormant_on(dev
);
7501 netif_dormant_off(dev
);
7503 if (netif_carrier_ok(rootdev
))
7504 netif_carrier_on(dev
);
7506 netif_carrier_off(dev
);
7508 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
7511 static int netif_alloc_rx_queues(struct net_device
*dev
)
7513 unsigned int i
, count
= dev
->num_rx_queues
;
7514 struct netdev_rx_queue
*rx
;
7515 size_t sz
= count
* sizeof(*rx
);
7519 rx
= kvzalloc(sz
, GFP_KERNEL
| __GFP_RETRY_MAYFAIL
);
7525 for (i
= 0; i
< count
; i
++)
7531 static void netdev_init_one_queue(struct net_device
*dev
,
7532 struct netdev_queue
*queue
, void *_unused
)
7534 /* Initialize queue lock */
7535 spin_lock_init(&queue
->_xmit_lock
);
7536 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
7537 queue
->xmit_lock_owner
= -1;
7538 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
7541 dql_init(&queue
->dql
, HZ
);
7545 static void netif_free_tx_queues(struct net_device
*dev
)
7550 static int netif_alloc_netdev_queues(struct net_device
*dev
)
7552 unsigned int count
= dev
->num_tx_queues
;
7553 struct netdev_queue
*tx
;
7554 size_t sz
= count
* sizeof(*tx
);
7556 if (count
< 1 || count
> 0xffff)
7559 tx
= kvzalloc(sz
, GFP_KERNEL
| __GFP_RETRY_MAYFAIL
);
7565 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
7566 spin_lock_init(&dev
->tx_global_lock
);
7571 void netif_tx_stop_all_queues(struct net_device
*dev
)
7575 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
7576 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
7578 netif_tx_stop_queue(txq
);
7581 EXPORT_SYMBOL(netif_tx_stop_all_queues
);
7584 * register_netdevice - register a network device
7585 * @dev: device to register
7587 * Take a completed network device structure and add it to the kernel
7588 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
7589 * chain. 0 is returned on success. A negative errno code is returned
7590 * on a failure to set up the device, or if the name is a duplicate.
7592 * Callers must hold the rtnl semaphore. You may want
7593 * register_netdev() instead of this.
7596 * The locking appears insufficient to guarantee two parallel registers
7597 * will not get the same name.
7600 int register_netdevice(struct net_device
*dev
)
7603 struct net
*net
= dev_net(dev
);
7605 BUG_ON(dev_boot_phase
);
7610 /* When net_device's are persistent, this will be fatal. */
7611 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
7614 spin_lock_init(&dev
->addr_list_lock
);
7615 netdev_set_addr_lockdep_class(dev
);
7617 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
7621 /* Init, if this function is available */
7622 if (dev
->netdev_ops
->ndo_init
) {
7623 ret
= dev
->netdev_ops
->ndo_init(dev
);
7631 if (((dev
->hw_features
| dev
->features
) &
7632 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
7633 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
7634 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
7635 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
7642 dev
->ifindex
= dev_new_index(net
);
7643 else if (__dev_get_by_index(net
, dev
->ifindex
))
7646 /* Transfer changeable features to wanted_features and enable
7647 * software offloads (GSO and GRO).
7649 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
7650 dev
->features
|= NETIF_F_SOFT_FEATURES
;
7652 if (dev
->netdev_ops
->ndo_udp_tunnel_add
) {
7653 dev
->features
|= NETIF_F_RX_UDP_TUNNEL_PORT
;
7654 dev
->hw_features
|= NETIF_F_RX_UDP_TUNNEL_PORT
;
7657 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
7659 if (!(dev
->flags
& IFF_LOOPBACK
))
7660 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
7662 /* If IPv4 TCP segmentation offload is supported we should also
7663 * allow the device to enable segmenting the frame with the option
7664 * of ignoring a static IP ID value. This doesn't enable the
7665 * feature itself but allows the user to enable it later.
7667 if (dev
->hw_features
& NETIF_F_TSO
)
7668 dev
->hw_features
|= NETIF_F_TSO_MANGLEID
;
7669 if (dev
->vlan_features
& NETIF_F_TSO
)
7670 dev
->vlan_features
|= NETIF_F_TSO_MANGLEID
;
7671 if (dev
->mpls_features
& NETIF_F_TSO
)
7672 dev
->mpls_features
|= NETIF_F_TSO_MANGLEID
;
7673 if (dev
->hw_enc_features
& NETIF_F_TSO
)
7674 dev
->hw_enc_features
|= NETIF_F_TSO_MANGLEID
;
7676 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
7678 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
7680 /* Make NETIF_F_SG inheritable to tunnel devices.
7682 dev
->hw_enc_features
|= NETIF_F_SG
| NETIF_F_GSO_PARTIAL
;
7684 /* Make NETIF_F_SG inheritable to MPLS.
7686 dev
->mpls_features
|= NETIF_F_SG
;
7688 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
7689 ret
= notifier_to_errno(ret
);
7693 ret
= netdev_register_kobject(dev
);
7696 dev
->reg_state
= NETREG_REGISTERED
;
7698 __netdev_update_features(dev
);
7701 * Default initial state at registry is that the
7702 * device is present.
7705 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
7707 linkwatch_init_dev(dev
);
7709 dev_init_scheduler(dev
);
7711 list_netdevice(dev
);
7712 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
7714 /* If the device has permanent device address, driver should
7715 * set dev_addr and also addr_assign_type should be set to
7716 * NET_ADDR_PERM (default value).
7718 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
7719 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
7721 /* Notify protocols, that a new device appeared. */
7722 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
7723 ret
= notifier_to_errno(ret
);
7725 rollback_registered(dev
);
7726 dev
->reg_state
= NETREG_UNREGISTERED
;
7729 * Prevent userspace races by waiting until the network
7730 * device is fully setup before sending notifications.
7732 if (!dev
->rtnl_link_ops
||
7733 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
7734 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
7740 if (dev
->netdev_ops
->ndo_uninit
)
7741 dev
->netdev_ops
->ndo_uninit(dev
);
7742 if (dev
->priv_destructor
)
7743 dev
->priv_destructor(dev
);
7746 EXPORT_SYMBOL(register_netdevice
);
7749 * init_dummy_netdev - init a dummy network device for NAPI
7750 * @dev: device to init
7752 * This takes a network device structure and initialize the minimum
7753 * amount of fields so it can be used to schedule NAPI polls without
7754 * registering a full blown interface. This is to be used by drivers
7755 * that need to tie several hardware interfaces to a single NAPI
7756 * poll scheduler due to HW limitations.
7758 int init_dummy_netdev(struct net_device
*dev
)
7760 /* Clear everything. Note we don't initialize spinlocks
7761 * are they aren't supposed to be taken by any of the
7762 * NAPI code and this dummy netdev is supposed to be
7763 * only ever used for NAPI polls
7765 memset(dev
, 0, sizeof(struct net_device
));
7767 /* make sure we BUG if trying to hit standard
7768 * register/unregister code path
7770 dev
->reg_state
= NETREG_DUMMY
;
7772 /* NAPI wants this */
7773 INIT_LIST_HEAD(&dev
->napi_list
);
7775 /* a dummy interface is started by default */
7776 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
7777 set_bit(__LINK_STATE_START
, &dev
->state
);
7779 /* Note : We dont allocate pcpu_refcnt for dummy devices,
7780 * because users of this 'device' dont need to change
7786 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
7790 * register_netdev - register a network device
7791 * @dev: device to register
7793 * Take a completed network device structure and add it to the kernel
7794 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
7795 * chain. 0 is returned on success. A negative errno code is returned
7796 * on a failure to set up the device, or if the name is a duplicate.
7798 * This is a wrapper around register_netdevice that takes the rtnl semaphore
7799 * and expands the device name if you passed a format string to
7802 int register_netdev(struct net_device
*dev
)
7807 err
= register_netdevice(dev
);
7811 EXPORT_SYMBOL(register_netdev
);
7813 int netdev_refcnt_read(const struct net_device
*dev
)
7817 for_each_possible_cpu(i
)
7818 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
7821 EXPORT_SYMBOL(netdev_refcnt_read
);
7824 * netdev_wait_allrefs - wait until all references are gone.
7825 * @dev: target net_device
7827 * This is called when unregistering network devices.
7829 * Any protocol or device that holds a reference should register
7830 * for netdevice notification, and cleanup and put back the
7831 * reference if they receive an UNREGISTER event.
7832 * We can get stuck here if buggy protocols don't correctly
7835 static void netdev_wait_allrefs(struct net_device
*dev
)
7837 unsigned long rebroadcast_time
, warning_time
;
7840 linkwatch_forget_dev(dev
);
7842 rebroadcast_time
= warning_time
= jiffies
;
7843 refcnt
= netdev_refcnt_read(dev
);
7845 while (refcnt
!= 0) {
7846 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
7849 /* Rebroadcast unregister notification */
7850 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
7856 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7857 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
7859 /* We must not have linkwatch events
7860 * pending on unregister. If this
7861 * happens, we simply run the queue
7862 * unscheduled, resulting in a noop
7865 linkwatch_run_queue();
7870 rebroadcast_time
= jiffies
;
7875 refcnt
= netdev_refcnt_read(dev
);
7877 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
7878 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
7880 warning_time
= jiffies
;
7889 * register_netdevice(x1);
7890 * register_netdevice(x2);
7892 * unregister_netdevice(y1);
7893 * unregister_netdevice(y2);
7899 * We are invoked by rtnl_unlock().
7900 * This allows us to deal with problems:
7901 * 1) We can delete sysfs objects which invoke hotplug
7902 * without deadlocking with linkwatch via keventd.
7903 * 2) Since we run with the RTNL semaphore not held, we can sleep
7904 * safely in order to wait for the netdev refcnt to drop to zero.
7906 * We must not return until all unregister events added during
7907 * the interval the lock was held have been completed.
7909 void netdev_run_todo(void)
7911 struct list_head list
;
7913 /* Snapshot list, allow later requests */
7914 list_replace_init(&net_todo_list
, &list
);
7919 /* Wait for rcu callbacks to finish before next phase */
7920 if (!list_empty(&list
))
7923 while (!list_empty(&list
)) {
7924 struct net_device
*dev
7925 = list_first_entry(&list
, struct net_device
, todo_list
);
7926 list_del(&dev
->todo_list
);
7929 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7932 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
7933 pr_err("network todo '%s' but state %d\n",
7934 dev
->name
, dev
->reg_state
);
7939 dev
->reg_state
= NETREG_UNREGISTERED
;
7941 netdev_wait_allrefs(dev
);
7944 BUG_ON(netdev_refcnt_read(dev
));
7945 BUG_ON(!list_empty(&dev
->ptype_all
));
7946 BUG_ON(!list_empty(&dev
->ptype_specific
));
7947 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
7948 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
7949 WARN_ON(dev
->dn_ptr
);
7951 if (dev
->priv_destructor
)
7952 dev
->priv_destructor(dev
);
7953 if (dev
->needs_free_netdev
)
7956 /* Report a network device has been unregistered */
7958 dev_net(dev
)->dev_unreg_count
--;
7960 wake_up(&netdev_unregistering_wq
);
7962 /* Free network device */
7963 kobject_put(&dev
->dev
.kobj
);
7967 /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has
7968 * all the same fields in the same order as net_device_stats, with only
7969 * the type differing, but rtnl_link_stats64 may have additional fields
7970 * at the end for newer counters.
7972 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
7973 const struct net_device_stats
*netdev_stats
)
7975 #if BITS_PER_LONG == 64
7976 BUILD_BUG_ON(sizeof(*stats64
) < sizeof(*netdev_stats
));
7977 memcpy(stats64
, netdev_stats
, sizeof(*netdev_stats
));
7978 /* zero out counters that only exist in rtnl_link_stats64 */
7979 memset((char *)stats64
+ sizeof(*netdev_stats
), 0,
7980 sizeof(*stats64
) - sizeof(*netdev_stats
));
7982 size_t i
, n
= sizeof(*netdev_stats
) / sizeof(unsigned long);
7983 const unsigned long *src
= (const unsigned long *)netdev_stats
;
7984 u64
*dst
= (u64
*)stats64
;
7986 BUILD_BUG_ON(n
> sizeof(*stats64
) / sizeof(u64
));
7987 for (i
= 0; i
< n
; i
++)
7989 /* zero out counters that only exist in rtnl_link_stats64 */
7990 memset((char *)stats64
+ n
* sizeof(u64
), 0,
7991 sizeof(*stats64
) - n
* sizeof(u64
));
7994 EXPORT_SYMBOL(netdev_stats_to_stats64
);
7997 * dev_get_stats - get network device statistics
7998 * @dev: device to get statistics from
7999 * @storage: place to store stats
8001 * Get network statistics from device. Return @storage.
8002 * The device driver may provide its own method by setting
8003 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
8004 * otherwise the internal statistics structure is used.
8006 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
8007 struct rtnl_link_stats64
*storage
)
8009 const struct net_device_ops
*ops
= dev
->netdev_ops
;
8011 if (ops
->ndo_get_stats64
) {
8012 memset(storage
, 0, sizeof(*storage
));
8013 ops
->ndo_get_stats64(dev
, storage
);
8014 } else if (ops
->ndo_get_stats
) {
8015 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
8017 netdev_stats_to_stats64(storage
, &dev
->stats
);
8019 storage
->rx_dropped
+= (unsigned long)atomic_long_read(&dev
->rx_dropped
);
8020 storage
->tx_dropped
+= (unsigned long)atomic_long_read(&dev
->tx_dropped
);
8021 storage
->rx_nohandler
+= (unsigned long)atomic_long_read(&dev
->rx_nohandler
);
8024 EXPORT_SYMBOL(dev_get_stats
);
8026 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
8028 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
8030 #ifdef CONFIG_NET_CLS_ACT
8033 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
8036 netdev_init_one_queue(dev
, queue
, NULL
);
8037 RCU_INIT_POINTER(queue
->qdisc
, &noop_qdisc
);
8038 queue
->qdisc_sleeping
= &noop_qdisc
;
8039 rcu_assign_pointer(dev
->ingress_queue
, queue
);
8044 static const struct ethtool_ops default_ethtool_ops
;
8046 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
8047 const struct ethtool_ops
*ops
)
8049 if (dev
->ethtool_ops
== &default_ethtool_ops
)
8050 dev
->ethtool_ops
= ops
;
8052 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
8054 void netdev_freemem(struct net_device
*dev
)
8056 char *addr
= (char *)dev
- dev
->padded
;
8062 * alloc_netdev_mqs - allocate network device
8063 * @sizeof_priv: size of private data to allocate space for
8064 * @name: device name format string
8065 * @name_assign_type: origin of device name
8066 * @setup: callback to initialize device
8067 * @txqs: the number of TX subqueues to allocate
8068 * @rxqs: the number of RX subqueues to allocate
8070 * Allocates a struct net_device with private data area for driver use
8071 * and performs basic initialization. Also allocates subqueue structs
8072 * for each queue on the device.
8074 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
8075 unsigned char name_assign_type
,
8076 void (*setup
)(struct net_device
*),
8077 unsigned int txqs
, unsigned int rxqs
)
8079 struct net_device
*dev
;
8080 unsigned int alloc_size
;
8081 struct net_device
*p
;
8083 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
8086 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
8092 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
8097 alloc_size
= sizeof(struct net_device
);
8099 /* ensure 32-byte alignment of private area */
8100 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
8101 alloc_size
+= sizeof_priv
;
8103 /* ensure 32-byte alignment of whole construct */
8104 alloc_size
+= NETDEV_ALIGN
- 1;
8106 p
= kvzalloc(alloc_size
, GFP_KERNEL
| __GFP_RETRY_MAYFAIL
);
8110 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
8111 dev
->padded
= (char *)dev
- (char *)p
;
8113 dev
->pcpu_refcnt
= alloc_percpu(int);
8114 if (!dev
->pcpu_refcnt
)
8117 if (dev_addr_init(dev
))
8123 dev_net_set(dev
, &init_net
);
8125 dev
->gso_max_size
= GSO_MAX_SIZE
;
8126 dev
->gso_max_segs
= GSO_MAX_SEGS
;
8128 INIT_LIST_HEAD(&dev
->napi_list
);
8129 INIT_LIST_HEAD(&dev
->unreg_list
);
8130 INIT_LIST_HEAD(&dev
->close_list
);
8131 INIT_LIST_HEAD(&dev
->link_watch_list
);
8132 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
8133 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
8134 INIT_LIST_HEAD(&dev
->ptype_all
);
8135 INIT_LIST_HEAD(&dev
->ptype_specific
);
8136 #ifdef CONFIG_NET_SCHED
8137 hash_init(dev
->qdisc_hash
);
8139 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
| IFF_XMIT_DST_RELEASE_PERM
;
8142 if (!dev
->tx_queue_len
) {
8143 dev
->priv_flags
|= IFF_NO_QUEUE
;
8144 dev
->tx_queue_len
= DEFAULT_TX_QUEUE_LEN
;
8147 dev
->num_tx_queues
= txqs
;
8148 dev
->real_num_tx_queues
= txqs
;
8149 if (netif_alloc_netdev_queues(dev
))
8153 dev
->num_rx_queues
= rxqs
;
8154 dev
->real_num_rx_queues
= rxqs
;
8155 if (netif_alloc_rx_queues(dev
))
8159 strcpy(dev
->name
, name
);
8160 dev
->name_assign_type
= name_assign_type
;
8161 dev
->group
= INIT_NETDEV_GROUP
;
8162 if (!dev
->ethtool_ops
)
8163 dev
->ethtool_ops
= &default_ethtool_ops
;
8165 nf_hook_ingress_init(dev
);
8174 free_percpu(dev
->pcpu_refcnt
);
8176 netdev_freemem(dev
);
8179 EXPORT_SYMBOL(alloc_netdev_mqs
);
8182 * free_netdev - free network device
8185 * This function does the last stage of destroying an allocated device
8186 * interface. The reference to the device object is released. If this
8187 * is the last reference then it will be freed.Must be called in process
8190 void free_netdev(struct net_device
*dev
)
8192 struct napi_struct
*p
, *n
;
8193 struct bpf_prog
*prog
;
8196 netif_free_tx_queues(dev
);
8201 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
8203 /* Flush device addresses */
8204 dev_addr_flush(dev
);
8206 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
8209 free_percpu(dev
->pcpu_refcnt
);
8210 dev
->pcpu_refcnt
= NULL
;
8212 prog
= rcu_dereference_protected(dev
->xdp_prog
, 1);
8215 static_key_slow_dec(&generic_xdp_needed
);
8218 /* Compatibility with error handling in drivers */
8219 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
8220 netdev_freemem(dev
);
8224 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
8225 dev
->reg_state
= NETREG_RELEASED
;
8227 /* will free via device release */
8228 put_device(&dev
->dev
);
8230 EXPORT_SYMBOL(free_netdev
);
8233 * synchronize_net - Synchronize with packet receive processing
8235 * Wait for packets currently being received to be done.
8236 * Does not block later packets from starting.
8238 void synchronize_net(void)
8241 if (rtnl_is_locked())
8242 synchronize_rcu_expedited();
8246 EXPORT_SYMBOL(synchronize_net
);
8249 * unregister_netdevice_queue - remove device from the kernel
8253 * This function shuts down a device interface and removes it
8254 * from the kernel tables.
8255 * If head not NULL, device is queued to be unregistered later.
8257 * Callers must hold the rtnl semaphore. You may want
8258 * unregister_netdev() instead of this.
8261 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
8266 list_move_tail(&dev
->unreg_list
, head
);
8268 rollback_registered(dev
);
8269 /* Finish processing unregister after unlock */
8273 EXPORT_SYMBOL(unregister_netdevice_queue
);
8276 * unregister_netdevice_many - unregister many devices
8277 * @head: list of devices
8279 * Note: As most callers use a stack allocated list_head,
8280 * we force a list_del() to make sure stack wont be corrupted later.
8282 void unregister_netdevice_many(struct list_head
*head
)
8284 struct net_device
*dev
;
8286 if (!list_empty(head
)) {
8287 rollback_registered_many(head
);
8288 list_for_each_entry(dev
, head
, unreg_list
)
8293 EXPORT_SYMBOL(unregister_netdevice_many
);
8296 * unregister_netdev - remove device from the kernel
8299 * This function shuts down a device interface and removes it
8300 * from the kernel tables.
8302 * This is just a wrapper for unregister_netdevice that takes
8303 * the rtnl semaphore. In general you want to use this and not
8304 * unregister_netdevice.
8306 void unregister_netdev(struct net_device
*dev
)
8309 unregister_netdevice(dev
);
8312 EXPORT_SYMBOL(unregister_netdev
);
8315 * dev_change_net_namespace - move device to different nethost namespace
8317 * @net: network namespace
8318 * @pat: If not NULL name pattern to try if the current device name
8319 * is already taken in the destination network namespace.
8321 * This function shuts down a device interface and moves it
8322 * to a new network namespace. On success 0 is returned, on
8323 * a failure a netagive errno code is returned.
8325 * Callers must hold the rtnl semaphore.
8328 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
8334 /* Don't allow namespace local devices to be moved. */
8336 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
8339 /* Ensure the device has been registrered */
8340 if (dev
->reg_state
!= NETREG_REGISTERED
)
8343 /* Get out if there is nothing todo */
8345 if (net_eq(dev_net(dev
), net
))
8348 /* Pick the destination device name, and ensure
8349 * we can use it in the destination network namespace.
8352 if (__dev_get_by_name(net
, dev
->name
)) {
8353 /* We get here if we can't use the current device name */
8356 if (dev_get_valid_name(net
, dev
, pat
) < 0)
8361 * And now a mini version of register_netdevice unregister_netdevice.
8364 /* If device is running close it first. */
8367 /* And unlink it from device chain */
8369 unlist_netdevice(dev
);
8373 /* Shutdown queueing discipline. */
8376 /* Notify protocols, that we are about to destroy
8377 * this device. They should clean all the things.
8379 * Note that dev->reg_state stays at NETREG_REGISTERED.
8380 * This is wanted because this way 8021q and macvlan know
8381 * the device is just moving and can keep their slaves up.
8383 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
8385 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
8386 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->get_link_net
)
8387 new_nsid
= peernet2id_alloc(dev_net(dev
), net
);
8389 new_nsid
= peernet2id(dev_net(dev
), net
);
8390 rtmsg_ifinfo_newnet(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
, &new_nsid
);
8393 * Flush the unicast and multicast chains
8398 /* Send a netdev-removed uevent to the old namespace */
8399 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
8400 netdev_adjacent_del_links(dev
);
8402 /* Actually switch the network namespace */
8403 dev_net_set(dev
, net
);
8405 /* If there is an ifindex conflict assign a new one */
8406 if (__dev_get_by_index(net
, dev
->ifindex
))
8407 dev
->ifindex
= dev_new_index(net
);
8409 /* Send a netdev-add uevent to the new namespace */
8410 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
8411 netdev_adjacent_add_links(dev
);
8413 /* Fixup kobjects */
8414 err
= device_rename(&dev
->dev
, dev
->name
);
8417 /* Add the device back in the hashes */
8418 list_netdevice(dev
);
8420 /* Notify protocols, that a new device appeared. */
8421 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
8424 * Prevent userspace races by waiting until the network
8425 * device is fully setup before sending notifications.
8427 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
8434 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
8436 static int dev_cpu_dead(unsigned int oldcpu
)
8438 struct sk_buff
**list_skb
;
8439 struct sk_buff
*skb
;
8441 struct softnet_data
*sd
, *oldsd
, *remsd
= NULL
;
8443 local_irq_disable();
8444 cpu
= smp_processor_id();
8445 sd
= &per_cpu(softnet_data
, cpu
);
8446 oldsd
= &per_cpu(softnet_data
, oldcpu
);
8448 /* Find end of our completion_queue. */
8449 list_skb
= &sd
->completion_queue
;
8451 list_skb
= &(*list_skb
)->next
;
8452 /* Append completion queue from offline CPU. */
8453 *list_skb
= oldsd
->completion_queue
;
8454 oldsd
->completion_queue
= NULL
;
8456 /* Append output queue from offline CPU. */
8457 if (oldsd
->output_queue
) {
8458 *sd
->output_queue_tailp
= oldsd
->output_queue
;
8459 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
8460 oldsd
->output_queue
= NULL
;
8461 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
8463 /* Append NAPI poll list from offline CPU, with one exception :
8464 * process_backlog() must be called by cpu owning percpu backlog.
8465 * We properly handle process_queue & input_pkt_queue later.
8467 while (!list_empty(&oldsd
->poll_list
)) {
8468 struct napi_struct
*napi
= list_first_entry(&oldsd
->poll_list
,
8472 list_del_init(&napi
->poll_list
);
8473 if (napi
->poll
== process_backlog
)
8476 ____napi_schedule(sd
, napi
);
8479 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
8483 remsd
= oldsd
->rps_ipi_list
;
8484 oldsd
->rps_ipi_list
= NULL
;
8486 /* send out pending IPI's on offline CPU */
8487 net_rps_send_ipi(remsd
);
8489 /* Process offline CPU's input_pkt_queue */
8490 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
8492 input_queue_head_incr(oldsd
);
8494 while ((skb
= skb_dequeue(&oldsd
->input_pkt_queue
))) {
8496 input_queue_head_incr(oldsd
);
8503 * netdev_increment_features - increment feature set by one
8504 * @all: current feature set
8505 * @one: new feature set
8506 * @mask: mask feature set
8508 * Computes a new feature set after adding a device with feature set
8509 * @one to the master device with current feature set @all. Will not
8510 * enable anything that is off in @mask. Returns the new feature set.
8512 netdev_features_t
netdev_increment_features(netdev_features_t all
,
8513 netdev_features_t one
, netdev_features_t mask
)
8515 if (mask
& NETIF_F_HW_CSUM
)
8516 mask
|= NETIF_F_CSUM_MASK
;
8517 mask
|= NETIF_F_VLAN_CHALLENGED
;
8519 all
|= one
& (NETIF_F_ONE_FOR_ALL
| NETIF_F_CSUM_MASK
) & mask
;
8520 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
8522 /* If one device supports hw checksumming, set for all. */
8523 if (all
& NETIF_F_HW_CSUM
)
8524 all
&= ~(NETIF_F_CSUM_MASK
& ~NETIF_F_HW_CSUM
);
8528 EXPORT_SYMBOL(netdev_increment_features
);
8530 static struct hlist_head
* __net_init
netdev_create_hash(void)
8533 struct hlist_head
*hash
;
8535 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
8537 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
8538 INIT_HLIST_HEAD(&hash
[i
]);
8543 /* Initialize per network namespace state */
8544 static int __net_init
netdev_init(struct net
*net
)
8546 if (net
!= &init_net
)
8547 INIT_LIST_HEAD(&net
->dev_base_head
);
8549 net
->dev_name_head
= netdev_create_hash();
8550 if (net
->dev_name_head
== NULL
)
8553 net
->dev_index_head
= netdev_create_hash();
8554 if (net
->dev_index_head
== NULL
)
8560 kfree(net
->dev_name_head
);
8566 * netdev_drivername - network driver for the device
8567 * @dev: network device
8569 * Determine network driver for device.
8571 const char *netdev_drivername(const struct net_device
*dev
)
8573 const struct device_driver
*driver
;
8574 const struct device
*parent
;
8575 const char *empty
= "";
8577 parent
= dev
->dev
.parent
;
8581 driver
= parent
->driver
;
8582 if (driver
&& driver
->name
)
8583 return driver
->name
;
8587 static void __netdev_printk(const char *level
, const struct net_device
*dev
,
8588 struct va_format
*vaf
)
8590 if (dev
&& dev
->dev
.parent
) {
8591 dev_printk_emit(level
[1] - '0',
8594 dev_driver_string(dev
->dev
.parent
),
8595 dev_name(dev
->dev
.parent
),
8596 netdev_name(dev
), netdev_reg_state(dev
),
8599 printk("%s%s%s: %pV",
8600 level
, netdev_name(dev
), netdev_reg_state(dev
), vaf
);
8602 printk("%s(NULL net_device): %pV", level
, vaf
);
8606 void netdev_printk(const char *level
, const struct net_device
*dev
,
8607 const char *format
, ...)
8609 struct va_format vaf
;
8612 va_start(args
, format
);
8617 __netdev_printk(level
, dev
, &vaf
);
8621 EXPORT_SYMBOL(netdev_printk
);
8623 #define define_netdev_printk_level(func, level) \
8624 void func(const struct net_device *dev, const char *fmt, ...) \
8626 struct va_format vaf; \
8629 va_start(args, fmt); \
8634 __netdev_printk(level, dev, &vaf); \
8638 EXPORT_SYMBOL(func);
8640 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
8641 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
8642 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
8643 define_netdev_printk_level(netdev_err
, KERN_ERR
);
8644 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
8645 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
8646 define_netdev_printk_level(netdev_info
, KERN_INFO
);
8648 static void __net_exit
netdev_exit(struct net
*net
)
8650 kfree(net
->dev_name_head
);
8651 kfree(net
->dev_index_head
);
8652 if (net
!= &init_net
)
8653 WARN_ON_ONCE(!list_empty(&net
->dev_base_head
));
8656 static struct pernet_operations __net_initdata netdev_net_ops
= {
8657 .init
= netdev_init
,
8658 .exit
= netdev_exit
,
8661 static void __net_exit
default_device_exit(struct net
*net
)
8663 struct net_device
*dev
, *aux
;
8665 * Push all migratable network devices back to the
8666 * initial network namespace
8669 for_each_netdev_safe(net
, dev
, aux
) {
8671 char fb_name
[IFNAMSIZ
];
8673 /* Ignore unmoveable devices (i.e. loopback) */
8674 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
8677 /* Leave virtual devices for the generic cleanup */
8678 if (dev
->rtnl_link_ops
)
8681 /* Push remaining network devices to init_net */
8682 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
8683 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
8685 pr_emerg("%s: failed to move %s to init_net: %d\n",
8686 __func__
, dev
->name
, err
);
8693 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
8695 /* Return with the rtnl_lock held when there are no network
8696 * devices unregistering in any network namespace in net_list.
8700 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
8702 add_wait_queue(&netdev_unregistering_wq
, &wait
);
8704 unregistering
= false;
8706 list_for_each_entry(net
, net_list
, exit_list
) {
8707 if (net
->dev_unreg_count
> 0) {
8708 unregistering
= true;
8716 wait_woken(&wait
, TASK_UNINTERRUPTIBLE
, MAX_SCHEDULE_TIMEOUT
);
8718 remove_wait_queue(&netdev_unregistering_wq
, &wait
);
8721 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
8723 /* At exit all network devices most be removed from a network
8724 * namespace. Do this in the reverse order of registration.
8725 * Do this across as many network namespaces as possible to
8726 * improve batching efficiency.
8728 struct net_device
*dev
;
8730 LIST_HEAD(dev_kill_list
);
8732 /* To prevent network device cleanup code from dereferencing
8733 * loopback devices or network devices that have been freed
8734 * wait here for all pending unregistrations to complete,
8735 * before unregistring the loopback device and allowing the
8736 * network namespace be freed.
8738 * The netdev todo list containing all network devices
8739 * unregistrations that happen in default_device_exit_batch
8740 * will run in the rtnl_unlock() at the end of
8741 * default_device_exit_batch.
8743 rtnl_lock_unregistering(net_list
);
8744 list_for_each_entry(net
, net_list
, exit_list
) {
8745 for_each_netdev_reverse(net
, dev
) {
8746 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
)
8747 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
8749 unregister_netdevice_queue(dev
, &dev_kill_list
);
8752 unregister_netdevice_many(&dev_kill_list
);
8756 static struct pernet_operations __net_initdata default_device_ops
= {
8757 .exit
= default_device_exit
,
8758 .exit_batch
= default_device_exit_batch
,
8762 * Initialize the DEV module. At boot time this walks the device list and
8763 * unhooks any devices that fail to initialise (normally hardware not
8764 * present) and leaves us with a valid list of present and active devices.
8769 * This is called single threaded during boot, so no need
8770 * to take the rtnl semaphore.
8772 static int __init
net_dev_init(void)
8774 int i
, rc
= -ENOMEM
;
8776 BUG_ON(!dev_boot_phase
);
8778 if (dev_proc_init())
8781 if (netdev_kobject_init())
8784 INIT_LIST_HEAD(&ptype_all
);
8785 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
8786 INIT_LIST_HEAD(&ptype_base
[i
]);
8788 INIT_LIST_HEAD(&offload_base
);
8790 if (register_pernet_subsys(&netdev_net_ops
))
8794 * Initialise the packet receive queues.
8797 for_each_possible_cpu(i
) {
8798 struct work_struct
*flush
= per_cpu_ptr(&flush_works
, i
);
8799 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
8801 INIT_WORK(flush
, flush_backlog
);
8803 skb_queue_head_init(&sd
->input_pkt_queue
);
8804 skb_queue_head_init(&sd
->process_queue
);
8805 INIT_LIST_HEAD(&sd
->poll_list
);
8806 sd
->output_queue_tailp
= &sd
->output_queue
;
8808 sd
->csd
.func
= rps_trigger_softirq
;
8813 sd
->backlog
.poll
= process_backlog
;
8814 sd
->backlog
.weight
= weight_p
;
8819 /* The loopback device is special if any other network devices
8820 * is present in a network namespace the loopback device must
8821 * be present. Since we now dynamically allocate and free the
8822 * loopback device ensure this invariant is maintained by
8823 * keeping the loopback device as the first device on the
8824 * list of network devices. Ensuring the loopback devices
8825 * is the first device that appears and the last network device
8828 if (register_pernet_device(&loopback_net_ops
))
8831 if (register_pernet_device(&default_device_ops
))
8834 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
8835 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
8837 rc
= cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD
, "net/dev:dead",
8838 NULL
, dev_cpu_dead
);
8845 subsys_initcall(net_dev_init
);