2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/stat.h>
102 #include <net/dst_metadata.h>
103 #include <net/pkt_sched.h>
104 #include <net/checksum.h>
105 #include <net/xfrm.h>
106 #include <linux/highmem.h>
107 #include <linux/init.h>
108 #include <linux/module.h>
109 #include <linux/netpoll.h>
110 #include <linux/rcupdate.h>
111 #include <linux/delay.h>
112 #include <net/iw_handler.h>
113 #include <asm/current.h>
114 #include <linux/audit.h>
115 #include <linux/dmaengine.h>
116 #include <linux/err.h>
117 #include <linux/ctype.h>
118 #include <linux/if_arp.h>
119 #include <linux/if_vlan.h>
120 #include <linux/ip.h>
122 #include <net/mpls.h>
123 #include <linux/ipv6.h>
124 #include <linux/in.h>
125 #include <linux/jhash.h>
126 #include <linux/random.h>
127 #include <trace/events/napi.h>
128 #include <trace/events/net.h>
129 #include <trace/events/skb.h>
130 #include <linux/pci.h>
131 #include <linux/inetdevice.h>
132 #include <linux/cpu_rmap.h>
133 #include <linux/static_key.h>
134 #include <linux/hashtable.h>
135 #include <linux/vmalloc.h>
136 #include <linux/if_macvlan.h>
137 #include <linux/errqueue.h>
138 #include <linux/hrtimer.h>
139 #include <linux/netfilter_ingress.h>
141 #include "net-sysfs.h"
143 /* Instead of increasing this, you should create a hash table. */
144 #define MAX_GRO_SKBS 8
146 /* This should be increased if a protocol with a bigger head is added. */
147 #define GRO_MAX_HEAD (MAX_HEADER + 128)
149 static DEFINE_SPINLOCK(ptype_lock
);
150 static DEFINE_SPINLOCK(offload_lock
);
151 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
152 struct list_head ptype_all __read_mostly
; /* Taps */
153 static struct list_head offload_base __read_mostly
;
155 static int netif_rx_internal(struct sk_buff
*skb
);
156 static int call_netdevice_notifiers_info(unsigned long val
,
157 struct net_device
*dev
,
158 struct netdev_notifier_info
*info
);
161 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
164 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
166 * Writers must hold the rtnl semaphore while they loop through the
167 * dev_base_head list, and hold dev_base_lock for writing when they do the
168 * actual updates. This allows pure readers to access the list even
169 * while a writer is preparing to update it.
171 * To put it another way, dev_base_lock is held for writing only to
172 * protect against pure readers; the rtnl semaphore provides the
173 * protection against other writers.
175 * See, for example usages, register_netdevice() and
176 * unregister_netdevice(), which must be called with the rtnl
179 DEFINE_RWLOCK(dev_base_lock
);
180 EXPORT_SYMBOL(dev_base_lock
);
182 /* protects napi_hash addition/deletion and napi_gen_id */
183 static DEFINE_SPINLOCK(napi_hash_lock
);
185 static unsigned int napi_gen_id
;
186 static DEFINE_HASHTABLE(napi_hash
, 8);
188 static seqcount_t devnet_rename_seq
;
190 static inline void dev_base_seq_inc(struct net
*net
)
192 while (++net
->dev_base_seq
== 0);
195 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
197 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
199 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
202 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
204 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
207 static inline void rps_lock(struct softnet_data
*sd
)
210 spin_lock(&sd
->input_pkt_queue
.lock
);
214 static inline void rps_unlock(struct softnet_data
*sd
)
217 spin_unlock(&sd
->input_pkt_queue
.lock
);
221 /* Device list insertion */
222 static void list_netdevice(struct net_device
*dev
)
224 struct net
*net
= dev_net(dev
);
228 write_lock_bh(&dev_base_lock
);
229 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
230 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
231 hlist_add_head_rcu(&dev
->index_hlist
,
232 dev_index_hash(net
, dev
->ifindex
));
233 write_unlock_bh(&dev_base_lock
);
235 dev_base_seq_inc(net
);
238 /* Device list removal
239 * caller must respect a RCU grace period before freeing/reusing dev
241 static void unlist_netdevice(struct net_device
*dev
)
245 /* Unlink dev from the device chain */
246 write_lock_bh(&dev_base_lock
);
247 list_del_rcu(&dev
->dev_list
);
248 hlist_del_rcu(&dev
->name_hlist
);
249 hlist_del_rcu(&dev
->index_hlist
);
250 write_unlock_bh(&dev_base_lock
);
252 dev_base_seq_inc(dev_net(dev
));
259 static RAW_NOTIFIER_HEAD(netdev_chain
);
262 * Device drivers call our routines to queue packets here. We empty the
263 * queue in the local softnet handler.
266 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
267 EXPORT_PER_CPU_SYMBOL(softnet_data
);
269 #ifdef CONFIG_LOCKDEP
271 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
272 * according to dev->type
274 static const unsigned short netdev_lock_type
[] =
275 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
276 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
277 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
278 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
279 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
280 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
281 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
282 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
283 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
284 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
285 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
286 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
287 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
288 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
289 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
291 static const char *const netdev_lock_name
[] =
292 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
293 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
294 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
295 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
296 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
297 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
298 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
299 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
300 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
301 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
302 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
303 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
304 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
305 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
306 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
308 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
309 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
311 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
315 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
316 if (netdev_lock_type
[i
] == dev_type
)
318 /* the last key is used by default */
319 return ARRAY_SIZE(netdev_lock_type
) - 1;
322 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
323 unsigned short dev_type
)
327 i
= netdev_lock_pos(dev_type
);
328 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
329 netdev_lock_name
[i
]);
332 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
336 i
= netdev_lock_pos(dev
->type
);
337 lockdep_set_class_and_name(&dev
->addr_list_lock
,
338 &netdev_addr_lock_key
[i
],
339 netdev_lock_name
[i
]);
342 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
343 unsigned short dev_type
)
346 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
351 /*******************************************************************************
353 Protocol management and registration routines
355 *******************************************************************************/
358 * Add a protocol ID to the list. Now that the input handler is
359 * smarter we can dispense with all the messy stuff that used to be
362 * BEWARE!!! Protocol handlers, mangling input packets,
363 * MUST BE last in hash buckets and checking protocol handlers
364 * MUST start from promiscuous ptype_all chain in net_bh.
365 * It is true now, do not change it.
366 * Explanation follows: if protocol handler, mangling packet, will
367 * be the first on list, it is not able to sense, that packet
368 * is cloned and should be copied-on-write, so that it will
369 * change it and subsequent readers will get broken packet.
373 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
375 if (pt
->type
== htons(ETH_P_ALL
))
376 return pt
->dev
? &pt
->dev
->ptype_all
: &ptype_all
;
378 return pt
->dev
? &pt
->dev
->ptype_specific
:
379 &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
383 * dev_add_pack - add packet handler
384 * @pt: packet type declaration
386 * Add a protocol handler to the networking stack. The passed &packet_type
387 * is linked into kernel lists and may not be freed until it has been
388 * removed from the kernel lists.
390 * This call does not sleep therefore it can not
391 * guarantee all CPU's that are in middle of receiving packets
392 * will see the new packet type (until the next received packet).
395 void dev_add_pack(struct packet_type
*pt
)
397 struct list_head
*head
= ptype_head(pt
);
399 spin_lock(&ptype_lock
);
400 list_add_rcu(&pt
->list
, head
);
401 spin_unlock(&ptype_lock
);
403 EXPORT_SYMBOL(dev_add_pack
);
406 * __dev_remove_pack - remove packet handler
407 * @pt: packet type declaration
409 * Remove a protocol handler that was previously added to the kernel
410 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
411 * from the kernel lists and can be freed or reused once this function
414 * The packet type might still be in use by receivers
415 * and must not be freed until after all the CPU's have gone
416 * through a quiescent state.
418 void __dev_remove_pack(struct packet_type
*pt
)
420 struct list_head
*head
= ptype_head(pt
);
421 struct packet_type
*pt1
;
423 spin_lock(&ptype_lock
);
425 list_for_each_entry(pt1
, head
, list
) {
427 list_del_rcu(&pt
->list
);
432 pr_warn("dev_remove_pack: %p not found\n", pt
);
434 spin_unlock(&ptype_lock
);
436 EXPORT_SYMBOL(__dev_remove_pack
);
439 * dev_remove_pack - remove packet handler
440 * @pt: packet type declaration
442 * Remove a protocol handler that was previously added to the kernel
443 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
444 * from the kernel lists and can be freed or reused once this function
447 * This call sleeps to guarantee that no CPU is looking at the packet
450 void dev_remove_pack(struct packet_type
*pt
)
452 __dev_remove_pack(pt
);
456 EXPORT_SYMBOL(dev_remove_pack
);
460 * dev_add_offload - register offload handlers
461 * @po: protocol offload declaration
463 * Add protocol offload handlers to the networking stack. The passed
464 * &proto_offload is linked into kernel lists and may not be freed until
465 * it has been removed from the kernel lists.
467 * This call does not sleep therefore it can not
468 * guarantee all CPU's that are in middle of receiving packets
469 * will see the new offload handlers (until the next received packet).
471 void dev_add_offload(struct packet_offload
*po
)
473 struct packet_offload
*elem
;
475 spin_lock(&offload_lock
);
476 list_for_each_entry(elem
, &offload_base
, list
) {
477 if (po
->priority
< elem
->priority
)
480 list_add_rcu(&po
->list
, elem
->list
.prev
);
481 spin_unlock(&offload_lock
);
483 EXPORT_SYMBOL(dev_add_offload
);
486 * __dev_remove_offload - remove offload handler
487 * @po: packet offload declaration
489 * Remove a protocol offload handler that was previously added to the
490 * kernel offload handlers by dev_add_offload(). The passed &offload_type
491 * is removed from the kernel lists and can be freed or reused once this
494 * The packet type might still be in use by receivers
495 * and must not be freed until after all the CPU's have gone
496 * through a quiescent state.
498 static void __dev_remove_offload(struct packet_offload
*po
)
500 struct list_head
*head
= &offload_base
;
501 struct packet_offload
*po1
;
503 spin_lock(&offload_lock
);
505 list_for_each_entry(po1
, head
, list
) {
507 list_del_rcu(&po
->list
);
512 pr_warn("dev_remove_offload: %p not found\n", po
);
514 spin_unlock(&offload_lock
);
518 * dev_remove_offload - remove packet offload handler
519 * @po: packet offload declaration
521 * Remove a packet offload handler that was previously added to the kernel
522 * offload handlers by dev_add_offload(). The passed &offload_type is
523 * removed from the kernel lists and can be freed or reused once this
526 * This call sleeps to guarantee that no CPU is looking at the packet
529 void dev_remove_offload(struct packet_offload
*po
)
531 __dev_remove_offload(po
);
535 EXPORT_SYMBOL(dev_remove_offload
);
537 /******************************************************************************
539 Device Boot-time Settings Routines
541 *******************************************************************************/
543 /* Boot time configuration table */
544 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
547 * netdev_boot_setup_add - add new setup entry
548 * @name: name of the device
549 * @map: configured settings for the device
551 * Adds new setup entry to the dev_boot_setup list. The function
552 * returns 0 on error and 1 on success. This is a generic routine to
555 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
557 struct netdev_boot_setup
*s
;
561 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
562 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
563 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
564 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
565 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
570 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
574 * netdev_boot_setup_check - check boot time settings
575 * @dev: the netdevice
577 * Check boot time settings for the device.
578 * The found settings are set for the device to be used
579 * later in the device probing.
580 * Returns 0 if no settings found, 1 if they are.
582 int netdev_boot_setup_check(struct net_device
*dev
)
584 struct netdev_boot_setup
*s
= dev_boot_setup
;
587 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
588 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
589 !strcmp(dev
->name
, s
[i
].name
)) {
590 dev
->irq
= s
[i
].map
.irq
;
591 dev
->base_addr
= s
[i
].map
.base_addr
;
592 dev
->mem_start
= s
[i
].map
.mem_start
;
593 dev
->mem_end
= s
[i
].map
.mem_end
;
599 EXPORT_SYMBOL(netdev_boot_setup_check
);
603 * netdev_boot_base - get address from boot time settings
604 * @prefix: prefix for network device
605 * @unit: id for network device
607 * Check boot time settings for the base address of device.
608 * The found settings are set for the device to be used
609 * later in the device probing.
610 * Returns 0 if no settings found.
612 unsigned long netdev_boot_base(const char *prefix
, int unit
)
614 const struct netdev_boot_setup
*s
= dev_boot_setup
;
618 sprintf(name
, "%s%d", prefix
, unit
);
621 * If device already registered then return base of 1
622 * to indicate not to probe for this interface
624 if (__dev_get_by_name(&init_net
, name
))
627 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
628 if (!strcmp(name
, s
[i
].name
))
629 return s
[i
].map
.base_addr
;
634 * Saves at boot time configured settings for any netdevice.
636 int __init
netdev_boot_setup(char *str
)
641 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
646 memset(&map
, 0, sizeof(map
));
650 map
.base_addr
= ints
[2];
652 map
.mem_start
= ints
[3];
654 map
.mem_end
= ints
[4];
656 /* Add new entry to the list */
657 return netdev_boot_setup_add(str
, &map
);
660 __setup("netdev=", netdev_boot_setup
);
662 /*******************************************************************************
664 Device Interface Subroutines
666 *******************************************************************************/
669 * dev_get_iflink - get 'iflink' value of a interface
670 * @dev: targeted interface
672 * Indicates the ifindex the interface is linked to.
673 * Physical interfaces have the same 'ifindex' and 'iflink' values.
676 int dev_get_iflink(const struct net_device
*dev
)
678 if (dev
->netdev_ops
&& dev
->netdev_ops
->ndo_get_iflink
)
679 return dev
->netdev_ops
->ndo_get_iflink(dev
);
683 EXPORT_SYMBOL(dev_get_iflink
);
686 * dev_fill_metadata_dst - Retrieve tunnel egress information.
687 * @dev: targeted interface
690 * For better visibility of tunnel traffic OVS needs to retrieve
691 * egress tunnel information for a packet. Following API allows
692 * user to get this info.
694 int dev_fill_metadata_dst(struct net_device
*dev
, struct sk_buff
*skb
)
696 struct ip_tunnel_info
*info
;
698 if (!dev
->netdev_ops
|| !dev
->netdev_ops
->ndo_fill_metadata_dst
)
701 info
= skb_tunnel_info_unclone(skb
);
704 if (unlikely(!(info
->mode
& IP_TUNNEL_INFO_TX
)))
707 return dev
->netdev_ops
->ndo_fill_metadata_dst(dev
, skb
);
709 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst
);
712 * __dev_get_by_name - find a device by its name
713 * @net: the applicable net namespace
714 * @name: name to find
716 * Find an interface by name. Must be called under RTNL semaphore
717 * or @dev_base_lock. If the name is found a pointer to the device
718 * is returned. If the name is not found then %NULL is returned. The
719 * reference counters are not incremented so the caller must be
720 * careful with locks.
723 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
725 struct net_device
*dev
;
726 struct hlist_head
*head
= dev_name_hash(net
, name
);
728 hlist_for_each_entry(dev
, head
, name_hlist
)
729 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
734 EXPORT_SYMBOL(__dev_get_by_name
);
737 * dev_get_by_name_rcu - find a device by its name
738 * @net: the applicable net namespace
739 * @name: name to find
741 * Find an interface by name.
742 * If the name is found a pointer to the device is returned.
743 * If the name is not found then %NULL is returned.
744 * The reference counters are not incremented so the caller must be
745 * careful with locks. The caller must hold RCU lock.
748 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
750 struct net_device
*dev
;
751 struct hlist_head
*head
= dev_name_hash(net
, name
);
753 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
754 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
759 EXPORT_SYMBOL(dev_get_by_name_rcu
);
762 * dev_get_by_name - find a device by its name
763 * @net: the applicable net namespace
764 * @name: name to find
766 * Find an interface by name. This can be called from any
767 * context and does its own locking. The returned handle has
768 * the usage count incremented and the caller must use dev_put() to
769 * release it when it is no longer needed. %NULL is returned if no
770 * matching device is found.
773 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
775 struct net_device
*dev
;
778 dev
= dev_get_by_name_rcu(net
, name
);
784 EXPORT_SYMBOL(dev_get_by_name
);
787 * __dev_get_by_index - find a device by its ifindex
788 * @net: the applicable net namespace
789 * @ifindex: index of device
791 * Search for an interface by index. Returns %NULL if the device
792 * is not found or a pointer to the device. The device has not
793 * had its reference counter increased so the caller must be careful
794 * about locking. The caller must hold either the RTNL semaphore
798 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
800 struct net_device
*dev
;
801 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
803 hlist_for_each_entry(dev
, head
, index_hlist
)
804 if (dev
->ifindex
== ifindex
)
809 EXPORT_SYMBOL(__dev_get_by_index
);
812 * dev_get_by_index_rcu - find a device by its ifindex
813 * @net: the applicable net namespace
814 * @ifindex: index of device
816 * Search for an interface by index. Returns %NULL if the device
817 * is not found or a pointer to the device. The device has not
818 * had its reference counter increased so the caller must be careful
819 * about locking. The caller must hold RCU lock.
822 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
824 struct net_device
*dev
;
825 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
827 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
828 if (dev
->ifindex
== ifindex
)
833 EXPORT_SYMBOL(dev_get_by_index_rcu
);
837 * dev_get_by_index - find a device by its ifindex
838 * @net: the applicable net namespace
839 * @ifindex: index of device
841 * Search for an interface by index. Returns NULL if the device
842 * is not found or a pointer to the device. The device returned has
843 * had a reference added and the pointer is safe until the user calls
844 * dev_put to indicate they have finished with it.
847 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
849 struct net_device
*dev
;
852 dev
= dev_get_by_index_rcu(net
, ifindex
);
858 EXPORT_SYMBOL(dev_get_by_index
);
861 * netdev_get_name - get a netdevice name, knowing its ifindex.
862 * @net: network namespace
863 * @name: a pointer to the buffer where the name will be stored.
864 * @ifindex: the ifindex of the interface to get the name from.
866 * The use of raw_seqcount_begin() and cond_resched() before
867 * retrying is required as we want to give the writers a chance
868 * to complete when CONFIG_PREEMPT is not set.
870 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
872 struct net_device
*dev
;
876 seq
= raw_seqcount_begin(&devnet_rename_seq
);
878 dev
= dev_get_by_index_rcu(net
, ifindex
);
884 strcpy(name
, dev
->name
);
886 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
895 * dev_getbyhwaddr_rcu - find a device by its hardware address
896 * @net: the applicable net namespace
897 * @type: media type of device
898 * @ha: hardware address
900 * Search for an interface by MAC address. Returns NULL if the device
901 * is not found or a pointer to the device.
902 * The caller must hold RCU or RTNL.
903 * The returned device has not had its ref count increased
904 * and the caller must therefore be careful about locking
908 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
911 struct net_device
*dev
;
913 for_each_netdev_rcu(net
, dev
)
914 if (dev
->type
== type
&&
915 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
920 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
922 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
924 struct net_device
*dev
;
927 for_each_netdev(net
, dev
)
928 if (dev
->type
== type
)
933 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
935 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
937 struct net_device
*dev
, *ret
= NULL
;
940 for_each_netdev_rcu(net
, dev
)
941 if (dev
->type
== type
) {
949 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
952 * __dev_get_by_flags - find any device with given flags
953 * @net: the applicable net namespace
954 * @if_flags: IFF_* values
955 * @mask: bitmask of bits in if_flags to check
957 * Search for any interface with the given flags. Returns NULL if a device
958 * is not found or a pointer to the device. Must be called inside
959 * rtnl_lock(), and result refcount is unchanged.
962 struct net_device
*__dev_get_by_flags(struct net
*net
, unsigned short if_flags
,
965 struct net_device
*dev
, *ret
;
970 for_each_netdev(net
, dev
) {
971 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
978 EXPORT_SYMBOL(__dev_get_by_flags
);
981 * dev_valid_name - check if name is okay for network device
984 * Network device names need to be valid file names to
985 * to allow sysfs to work. We also disallow any kind of
988 bool dev_valid_name(const char *name
)
992 if (strlen(name
) >= IFNAMSIZ
)
994 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
998 if (*name
== '/' || *name
== ':' || isspace(*name
))
1004 EXPORT_SYMBOL(dev_valid_name
);
1007 * __dev_alloc_name - allocate a name for a device
1008 * @net: network namespace to allocate the device name in
1009 * @name: name format string
1010 * @buf: scratch buffer and result name string
1012 * Passed a format string - eg "lt%d" it will try and find a suitable
1013 * id. It scans list of devices to build up a free map, then chooses
1014 * the first empty slot. The caller must hold the dev_base or rtnl lock
1015 * while allocating the name and adding the device in order to avoid
1017 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1018 * Returns the number of the unit assigned or a negative errno code.
1021 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
1025 const int max_netdevices
= 8*PAGE_SIZE
;
1026 unsigned long *inuse
;
1027 struct net_device
*d
;
1029 p
= strnchr(name
, IFNAMSIZ
-1, '%');
1032 * Verify the string as this thing may have come from
1033 * the user. There must be either one "%d" and no other "%"
1036 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
1039 /* Use one page as a bit array of possible slots */
1040 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
1044 for_each_netdev(net
, d
) {
1045 if (!sscanf(d
->name
, name
, &i
))
1047 if (i
< 0 || i
>= max_netdevices
)
1050 /* avoid cases where sscanf is not exact inverse of printf */
1051 snprintf(buf
, IFNAMSIZ
, name
, i
);
1052 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
1056 i
= find_first_zero_bit(inuse
, max_netdevices
);
1057 free_page((unsigned long) inuse
);
1061 snprintf(buf
, IFNAMSIZ
, name
, i
);
1062 if (!__dev_get_by_name(net
, buf
))
1065 /* It is possible to run out of possible slots
1066 * when the name is long and there isn't enough space left
1067 * for the digits, or if all bits are used.
1073 * dev_alloc_name - allocate a name for a device
1075 * @name: name format string
1077 * Passed a format string - eg "lt%d" it will try and find a suitable
1078 * id. It scans list of devices to build up a free map, then chooses
1079 * the first empty slot. The caller must hold the dev_base or rtnl lock
1080 * while allocating the name and adding the device in order to avoid
1082 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1083 * Returns the number of the unit assigned or a negative errno code.
1086 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1092 BUG_ON(!dev_net(dev
));
1094 ret
= __dev_alloc_name(net
, name
, buf
);
1096 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1099 EXPORT_SYMBOL(dev_alloc_name
);
1101 static int dev_alloc_name_ns(struct net
*net
,
1102 struct net_device
*dev
,
1108 ret
= __dev_alloc_name(net
, name
, buf
);
1110 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1114 static int dev_get_valid_name(struct net
*net
,
1115 struct net_device
*dev
,
1120 if (!dev_valid_name(name
))
1123 if (strchr(name
, '%'))
1124 return dev_alloc_name_ns(net
, dev
, name
);
1125 else if (__dev_get_by_name(net
, name
))
1127 else if (dev
->name
!= name
)
1128 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1134 * dev_change_name - change name of a device
1136 * @newname: name (or format string) must be at least IFNAMSIZ
1138 * Change name of a device, can pass format strings "eth%d".
1141 int dev_change_name(struct net_device
*dev
, const char *newname
)
1143 unsigned char old_assign_type
;
1144 char oldname
[IFNAMSIZ
];
1150 BUG_ON(!dev_net(dev
));
1153 if (dev
->flags
& IFF_UP
)
1156 write_seqcount_begin(&devnet_rename_seq
);
1158 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1159 write_seqcount_end(&devnet_rename_seq
);
1163 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1165 err
= dev_get_valid_name(net
, dev
, newname
);
1167 write_seqcount_end(&devnet_rename_seq
);
1171 if (oldname
[0] && !strchr(oldname
, '%'))
1172 netdev_info(dev
, "renamed from %s\n", oldname
);
1174 old_assign_type
= dev
->name_assign_type
;
1175 dev
->name_assign_type
= NET_NAME_RENAMED
;
1178 ret
= device_rename(&dev
->dev
, dev
->name
);
1180 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1181 dev
->name_assign_type
= old_assign_type
;
1182 write_seqcount_end(&devnet_rename_seq
);
1186 write_seqcount_end(&devnet_rename_seq
);
1188 netdev_adjacent_rename_links(dev
, oldname
);
1190 write_lock_bh(&dev_base_lock
);
1191 hlist_del_rcu(&dev
->name_hlist
);
1192 write_unlock_bh(&dev_base_lock
);
1196 write_lock_bh(&dev_base_lock
);
1197 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1198 write_unlock_bh(&dev_base_lock
);
1200 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1201 ret
= notifier_to_errno(ret
);
1204 /* err >= 0 after dev_alloc_name() or stores the first errno */
1207 write_seqcount_begin(&devnet_rename_seq
);
1208 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1209 memcpy(oldname
, newname
, IFNAMSIZ
);
1210 dev
->name_assign_type
= old_assign_type
;
1211 old_assign_type
= NET_NAME_RENAMED
;
1214 pr_err("%s: name change rollback failed: %d\n",
1223 * dev_set_alias - change ifalias of a device
1225 * @alias: name up to IFALIASZ
1226 * @len: limit of bytes to copy from info
1228 * Set ifalias for a device,
1230 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1236 if (len
>= IFALIASZ
)
1240 kfree(dev
->ifalias
);
1241 dev
->ifalias
= NULL
;
1245 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1248 dev
->ifalias
= new_ifalias
;
1250 strlcpy(dev
->ifalias
, alias
, len
+1);
1256 * netdev_features_change - device changes features
1257 * @dev: device to cause notification
1259 * Called to indicate a device has changed features.
1261 void netdev_features_change(struct net_device
*dev
)
1263 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1265 EXPORT_SYMBOL(netdev_features_change
);
1268 * netdev_state_change - device changes state
1269 * @dev: device to cause notification
1271 * Called to indicate a device has changed state. This function calls
1272 * the notifier chains for netdev_chain and sends a NEWLINK message
1273 * to the routing socket.
1275 void netdev_state_change(struct net_device
*dev
)
1277 if (dev
->flags
& IFF_UP
) {
1278 struct netdev_notifier_change_info change_info
;
1280 change_info
.flags_changed
= 0;
1281 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
1283 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1286 EXPORT_SYMBOL(netdev_state_change
);
1289 * netdev_notify_peers - notify network peers about existence of @dev
1290 * @dev: network device
1292 * Generate traffic such that interested network peers are aware of
1293 * @dev, such as by generating a gratuitous ARP. This may be used when
1294 * a device wants to inform the rest of the network about some sort of
1295 * reconfiguration such as a failover event or virtual machine
1298 void netdev_notify_peers(struct net_device
*dev
)
1301 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1304 EXPORT_SYMBOL(netdev_notify_peers
);
1306 static int __dev_open(struct net_device
*dev
)
1308 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1313 if (!netif_device_present(dev
))
1316 /* Block netpoll from trying to do any rx path servicing.
1317 * If we don't do this there is a chance ndo_poll_controller
1318 * or ndo_poll may be running while we open the device
1320 netpoll_poll_disable(dev
);
1322 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1323 ret
= notifier_to_errno(ret
);
1327 set_bit(__LINK_STATE_START
, &dev
->state
);
1329 if (ops
->ndo_validate_addr
)
1330 ret
= ops
->ndo_validate_addr(dev
);
1332 if (!ret
&& ops
->ndo_open
)
1333 ret
= ops
->ndo_open(dev
);
1335 netpoll_poll_enable(dev
);
1338 clear_bit(__LINK_STATE_START
, &dev
->state
);
1340 dev
->flags
|= IFF_UP
;
1341 dev_set_rx_mode(dev
);
1343 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1350 * dev_open - prepare an interface for use.
1351 * @dev: device to open
1353 * Takes a device from down to up state. The device's private open
1354 * function is invoked and then the multicast lists are loaded. Finally
1355 * the device is moved into the up state and a %NETDEV_UP message is
1356 * sent to the netdev notifier chain.
1358 * Calling this function on an active interface is a nop. On a failure
1359 * a negative errno code is returned.
1361 int dev_open(struct net_device
*dev
)
1365 if (dev
->flags
& IFF_UP
)
1368 ret
= __dev_open(dev
);
1372 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1373 call_netdevice_notifiers(NETDEV_UP
, dev
);
1377 EXPORT_SYMBOL(dev_open
);
1379 static int __dev_close_many(struct list_head
*head
)
1381 struct net_device
*dev
;
1386 list_for_each_entry(dev
, head
, close_list
) {
1387 /* Temporarily disable netpoll until the interface is down */
1388 netpoll_poll_disable(dev
);
1390 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1392 clear_bit(__LINK_STATE_START
, &dev
->state
);
1394 /* Synchronize to scheduled poll. We cannot touch poll list, it
1395 * can be even on different cpu. So just clear netif_running().
1397 * dev->stop() will invoke napi_disable() on all of it's
1398 * napi_struct instances on this device.
1400 smp_mb__after_atomic(); /* Commit netif_running(). */
1403 dev_deactivate_many(head
);
1405 list_for_each_entry(dev
, head
, close_list
) {
1406 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1409 * Call the device specific close. This cannot fail.
1410 * Only if device is UP
1412 * We allow it to be called even after a DETACH hot-plug
1418 dev
->flags
&= ~IFF_UP
;
1419 netpoll_poll_enable(dev
);
1425 static int __dev_close(struct net_device
*dev
)
1430 list_add(&dev
->close_list
, &single
);
1431 retval
= __dev_close_many(&single
);
1437 int dev_close_many(struct list_head
*head
, bool unlink
)
1439 struct net_device
*dev
, *tmp
;
1441 /* Remove the devices that don't need to be closed */
1442 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1443 if (!(dev
->flags
& IFF_UP
))
1444 list_del_init(&dev
->close_list
);
1446 __dev_close_many(head
);
1448 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1449 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1450 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1452 list_del_init(&dev
->close_list
);
1457 EXPORT_SYMBOL(dev_close_many
);
1460 * dev_close - shutdown an interface.
1461 * @dev: device to shutdown
1463 * This function moves an active device into down state. A
1464 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1465 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1468 int dev_close(struct net_device
*dev
)
1470 if (dev
->flags
& IFF_UP
) {
1473 list_add(&dev
->close_list
, &single
);
1474 dev_close_many(&single
, true);
1479 EXPORT_SYMBOL(dev_close
);
1483 * dev_disable_lro - disable Large Receive Offload on a device
1486 * Disable Large Receive Offload (LRO) on a net device. Must be
1487 * called under RTNL. This is needed if received packets may be
1488 * forwarded to another interface.
1490 void dev_disable_lro(struct net_device
*dev
)
1492 struct net_device
*lower_dev
;
1493 struct list_head
*iter
;
1495 dev
->wanted_features
&= ~NETIF_F_LRO
;
1496 netdev_update_features(dev
);
1498 if (unlikely(dev
->features
& NETIF_F_LRO
))
1499 netdev_WARN(dev
, "failed to disable LRO!\n");
1501 netdev_for_each_lower_dev(dev
, lower_dev
, iter
)
1502 dev_disable_lro(lower_dev
);
1504 EXPORT_SYMBOL(dev_disable_lro
);
1506 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1507 struct net_device
*dev
)
1509 struct netdev_notifier_info info
;
1511 netdev_notifier_info_init(&info
, dev
);
1512 return nb
->notifier_call(nb
, val
, &info
);
1515 static int dev_boot_phase
= 1;
1518 * register_netdevice_notifier - register a network notifier block
1521 * Register a notifier to be called when network device events occur.
1522 * The notifier passed is linked into the kernel structures and must
1523 * not be reused until it has been unregistered. A negative errno code
1524 * is returned on a failure.
1526 * When registered all registration and up events are replayed
1527 * to the new notifier to allow device to have a race free
1528 * view of the network device list.
1531 int register_netdevice_notifier(struct notifier_block
*nb
)
1533 struct net_device
*dev
;
1534 struct net_device
*last
;
1539 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1545 for_each_netdev(net
, dev
) {
1546 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1547 err
= notifier_to_errno(err
);
1551 if (!(dev
->flags
& IFF_UP
))
1554 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1565 for_each_netdev(net
, dev
) {
1569 if (dev
->flags
& IFF_UP
) {
1570 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1572 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1574 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1579 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1582 EXPORT_SYMBOL(register_netdevice_notifier
);
1585 * unregister_netdevice_notifier - unregister a network notifier block
1588 * Unregister a notifier previously registered by
1589 * register_netdevice_notifier(). The notifier is unlinked into the
1590 * kernel structures and may then be reused. A negative errno code
1591 * is returned on a failure.
1593 * After unregistering unregister and down device events are synthesized
1594 * for all devices on the device list to the removed notifier to remove
1595 * the need for special case cleanup code.
1598 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1600 struct net_device
*dev
;
1605 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1610 for_each_netdev(net
, dev
) {
1611 if (dev
->flags
& IFF_UP
) {
1612 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1614 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1616 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1623 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1626 * call_netdevice_notifiers_info - call all network notifier blocks
1627 * @val: value passed unmodified to notifier function
1628 * @dev: net_device pointer passed unmodified to notifier function
1629 * @info: notifier information data
1631 * Call all network notifier blocks. Parameters and return value
1632 * are as for raw_notifier_call_chain().
1635 static int call_netdevice_notifiers_info(unsigned long val
,
1636 struct net_device
*dev
,
1637 struct netdev_notifier_info
*info
)
1640 netdev_notifier_info_init(info
, dev
);
1641 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1645 * call_netdevice_notifiers - call all network notifier blocks
1646 * @val: value passed unmodified to notifier function
1647 * @dev: net_device pointer passed unmodified to notifier function
1649 * Call all network notifier blocks. Parameters and return value
1650 * are as for raw_notifier_call_chain().
1653 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1655 struct netdev_notifier_info info
;
1657 return call_netdevice_notifiers_info(val
, dev
, &info
);
1659 EXPORT_SYMBOL(call_netdevice_notifiers
);
1661 #ifdef CONFIG_NET_INGRESS
1662 static struct static_key ingress_needed __read_mostly
;
1664 void net_inc_ingress_queue(void)
1666 static_key_slow_inc(&ingress_needed
);
1668 EXPORT_SYMBOL_GPL(net_inc_ingress_queue
);
1670 void net_dec_ingress_queue(void)
1672 static_key_slow_dec(&ingress_needed
);
1674 EXPORT_SYMBOL_GPL(net_dec_ingress_queue
);
1677 static struct static_key netstamp_needed __read_mostly
;
1678 #ifdef HAVE_JUMP_LABEL
1679 /* We are not allowed to call static_key_slow_dec() from irq context
1680 * If net_disable_timestamp() is called from irq context, defer the
1681 * static_key_slow_dec() calls.
1683 static atomic_t netstamp_needed_deferred
;
1686 void net_enable_timestamp(void)
1688 #ifdef HAVE_JUMP_LABEL
1689 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1693 static_key_slow_dec(&netstamp_needed
);
1697 static_key_slow_inc(&netstamp_needed
);
1699 EXPORT_SYMBOL(net_enable_timestamp
);
1701 void net_disable_timestamp(void)
1703 #ifdef HAVE_JUMP_LABEL
1704 if (in_interrupt()) {
1705 atomic_inc(&netstamp_needed_deferred
);
1709 static_key_slow_dec(&netstamp_needed
);
1711 EXPORT_SYMBOL(net_disable_timestamp
);
1713 static inline void net_timestamp_set(struct sk_buff
*skb
)
1715 skb
->tstamp
.tv64
= 0;
1716 if (static_key_false(&netstamp_needed
))
1717 __net_timestamp(skb
);
1720 #define net_timestamp_check(COND, SKB) \
1721 if (static_key_false(&netstamp_needed)) { \
1722 if ((COND) && !(SKB)->tstamp.tv64) \
1723 __net_timestamp(SKB); \
1726 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1730 if (!(dev
->flags
& IFF_UP
))
1733 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1734 if (skb
->len
<= len
)
1737 /* if TSO is enabled, we don't care about the length as the packet
1738 * could be forwarded without being segmented before
1740 if (skb_is_gso(skb
))
1745 EXPORT_SYMBOL_GPL(is_skb_forwardable
);
1747 int __dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1749 if (skb_orphan_frags(skb
, GFP_ATOMIC
) ||
1750 unlikely(!is_skb_forwardable(dev
, skb
))) {
1751 atomic_long_inc(&dev
->rx_dropped
);
1756 skb_scrub_packet(skb
, true);
1758 skb
->protocol
= eth_type_trans(skb
, dev
);
1759 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
1763 EXPORT_SYMBOL_GPL(__dev_forward_skb
);
1766 * dev_forward_skb - loopback an skb to another netif
1768 * @dev: destination network device
1769 * @skb: buffer to forward
1772 * NET_RX_SUCCESS (no congestion)
1773 * NET_RX_DROP (packet was dropped, but freed)
1775 * dev_forward_skb can be used for injecting an skb from the
1776 * start_xmit function of one device into the receive queue
1777 * of another device.
1779 * The receiving device may be in another namespace, so
1780 * we have to clear all information in the skb that could
1781 * impact namespace isolation.
1783 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1785 return __dev_forward_skb(dev
, skb
) ?: netif_rx_internal(skb
);
1787 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1789 static inline int deliver_skb(struct sk_buff
*skb
,
1790 struct packet_type
*pt_prev
,
1791 struct net_device
*orig_dev
)
1793 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1795 atomic_inc(&skb
->users
);
1796 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1799 static inline void deliver_ptype_list_skb(struct sk_buff
*skb
,
1800 struct packet_type
**pt
,
1801 struct net_device
*orig_dev
,
1803 struct list_head
*ptype_list
)
1805 struct packet_type
*ptype
, *pt_prev
= *pt
;
1807 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1808 if (ptype
->type
!= type
)
1811 deliver_skb(skb
, pt_prev
, orig_dev
);
1817 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1819 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1822 if (ptype
->id_match
)
1823 return ptype
->id_match(ptype
, skb
->sk
);
1824 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1831 * Support routine. Sends outgoing frames to any network
1832 * taps currently in use.
1835 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1837 struct packet_type
*ptype
;
1838 struct sk_buff
*skb2
= NULL
;
1839 struct packet_type
*pt_prev
= NULL
;
1840 struct list_head
*ptype_list
= &ptype_all
;
1844 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1845 /* Never send packets back to the socket
1846 * they originated from - MvS (miquels@drinkel.ow.org)
1848 if (skb_loop_sk(ptype
, skb
))
1852 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1857 /* need to clone skb, done only once */
1858 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1862 net_timestamp_set(skb2
);
1864 /* skb->nh should be correctly
1865 * set by sender, so that the second statement is
1866 * just protection against buggy protocols.
1868 skb_reset_mac_header(skb2
);
1870 if (skb_network_header(skb2
) < skb2
->data
||
1871 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1872 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1873 ntohs(skb2
->protocol
),
1875 skb_reset_network_header(skb2
);
1878 skb2
->transport_header
= skb2
->network_header
;
1879 skb2
->pkt_type
= PACKET_OUTGOING
;
1883 if (ptype_list
== &ptype_all
) {
1884 ptype_list
= &dev
->ptype_all
;
1889 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1894 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1895 * @dev: Network device
1896 * @txq: number of queues available
1898 * If real_num_tx_queues is changed the tc mappings may no longer be
1899 * valid. To resolve this verify the tc mapping remains valid and if
1900 * not NULL the mapping. With no priorities mapping to this
1901 * offset/count pair it will no longer be used. In the worst case TC0
1902 * is invalid nothing can be done so disable priority mappings. If is
1903 * expected that drivers will fix this mapping if they can before
1904 * calling netif_set_real_num_tx_queues.
1906 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1909 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1911 /* If TC0 is invalidated disable TC mapping */
1912 if (tc
->offset
+ tc
->count
> txq
) {
1913 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1918 /* Invalidated prio to tc mappings set to TC0 */
1919 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1920 int q
= netdev_get_prio_tc_map(dev
, i
);
1922 tc
= &dev
->tc_to_txq
[q
];
1923 if (tc
->offset
+ tc
->count
> txq
) {
1924 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1926 netdev_set_prio_tc_map(dev
, i
, 0);
1932 static DEFINE_MUTEX(xps_map_mutex
);
1933 #define xmap_dereference(P) \
1934 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1936 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1939 struct xps_map
*map
= NULL
;
1943 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1945 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1946 if (map
->queues
[pos
] == index
) {
1948 map
->queues
[pos
] = map
->queues
[--map
->len
];
1950 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1951 kfree_rcu(map
, rcu
);
1961 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1963 struct xps_dev_maps
*dev_maps
;
1965 bool active
= false;
1967 mutex_lock(&xps_map_mutex
);
1968 dev_maps
= xmap_dereference(dev
->xps_maps
);
1973 for_each_possible_cpu(cpu
) {
1974 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1975 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1978 if (i
== dev
->num_tx_queues
)
1983 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1984 kfree_rcu(dev_maps
, rcu
);
1987 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1988 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1992 mutex_unlock(&xps_map_mutex
);
1995 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1998 struct xps_map
*new_map
;
1999 int alloc_len
= XPS_MIN_MAP_ALLOC
;
2002 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
2003 if (map
->queues
[pos
] != index
)
2008 /* Need to add queue to this CPU's existing map */
2010 if (pos
< map
->alloc_len
)
2013 alloc_len
= map
->alloc_len
* 2;
2016 /* Need to allocate new map to store queue on this CPU's map */
2017 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
2022 for (i
= 0; i
< pos
; i
++)
2023 new_map
->queues
[i
] = map
->queues
[i
];
2024 new_map
->alloc_len
= alloc_len
;
2030 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
2033 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
2034 struct xps_map
*map
, *new_map
;
2035 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
2036 int cpu
, numa_node_id
= -2;
2037 bool active
= false;
2039 mutex_lock(&xps_map_mutex
);
2041 dev_maps
= xmap_dereference(dev
->xps_maps
);
2043 /* allocate memory for queue storage */
2044 for_each_online_cpu(cpu
) {
2045 if (!cpumask_test_cpu(cpu
, mask
))
2049 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
2050 if (!new_dev_maps
) {
2051 mutex_unlock(&xps_map_mutex
);
2055 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2058 map
= expand_xps_map(map
, cpu
, index
);
2062 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2066 goto out_no_new_maps
;
2068 for_each_possible_cpu(cpu
) {
2069 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
2070 /* add queue to CPU maps */
2073 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2074 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
2077 if (pos
== map
->len
)
2078 map
->queues
[map
->len
++] = index
;
2080 if (numa_node_id
== -2)
2081 numa_node_id
= cpu_to_node(cpu
);
2082 else if (numa_node_id
!= cpu_to_node(cpu
))
2085 } else if (dev_maps
) {
2086 /* fill in the new device map from the old device map */
2087 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2088 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2093 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
2095 /* Cleanup old maps */
2097 for_each_possible_cpu(cpu
) {
2098 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2099 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2100 if (map
&& map
!= new_map
)
2101 kfree_rcu(map
, rcu
);
2104 kfree_rcu(dev_maps
, rcu
);
2107 dev_maps
= new_dev_maps
;
2111 /* update Tx queue numa node */
2112 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2113 (numa_node_id
>= 0) ? numa_node_id
:
2119 /* removes queue from unused CPUs */
2120 for_each_possible_cpu(cpu
) {
2121 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2124 if (remove_xps_queue(dev_maps
, cpu
, index
))
2128 /* free map if not active */
2130 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2131 kfree_rcu(dev_maps
, rcu
);
2135 mutex_unlock(&xps_map_mutex
);
2139 /* remove any maps that we added */
2140 for_each_possible_cpu(cpu
) {
2141 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2142 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2144 if (new_map
&& new_map
!= map
)
2148 mutex_unlock(&xps_map_mutex
);
2150 kfree(new_dev_maps
);
2153 EXPORT_SYMBOL(netif_set_xps_queue
);
2157 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2158 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2160 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2164 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2167 if (dev
->reg_state
== NETREG_REGISTERED
||
2168 dev
->reg_state
== NETREG_UNREGISTERING
) {
2171 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2177 netif_setup_tc(dev
, txq
);
2179 if (txq
< dev
->real_num_tx_queues
) {
2180 qdisc_reset_all_tx_gt(dev
, txq
);
2182 netif_reset_xps_queues_gt(dev
, txq
);
2187 dev
->real_num_tx_queues
= txq
;
2190 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2194 * netif_set_real_num_rx_queues - set actual number of RX queues used
2195 * @dev: Network device
2196 * @rxq: Actual number of RX queues
2198 * This must be called either with the rtnl_lock held or before
2199 * registration of the net device. Returns 0 on success, or a
2200 * negative error code. If called before registration, it always
2203 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2207 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2210 if (dev
->reg_state
== NETREG_REGISTERED
) {
2213 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2219 dev
->real_num_rx_queues
= rxq
;
2222 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2226 * netif_get_num_default_rss_queues - default number of RSS queues
2228 * This routine should set an upper limit on the number of RSS queues
2229 * used by default by multiqueue devices.
2231 int netif_get_num_default_rss_queues(void)
2233 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2235 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2237 static inline void __netif_reschedule(struct Qdisc
*q
)
2239 struct softnet_data
*sd
;
2240 unsigned long flags
;
2242 local_irq_save(flags
);
2243 sd
= this_cpu_ptr(&softnet_data
);
2244 q
->next_sched
= NULL
;
2245 *sd
->output_queue_tailp
= q
;
2246 sd
->output_queue_tailp
= &q
->next_sched
;
2247 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2248 local_irq_restore(flags
);
2251 void __netif_schedule(struct Qdisc
*q
)
2253 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2254 __netif_reschedule(q
);
2256 EXPORT_SYMBOL(__netif_schedule
);
2258 struct dev_kfree_skb_cb
{
2259 enum skb_free_reason reason
;
2262 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2264 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2267 void netif_schedule_queue(struct netdev_queue
*txq
)
2270 if (!(txq
->state
& QUEUE_STATE_ANY_XOFF
)) {
2271 struct Qdisc
*q
= rcu_dereference(txq
->qdisc
);
2273 __netif_schedule(q
);
2277 EXPORT_SYMBOL(netif_schedule_queue
);
2280 * netif_wake_subqueue - allow sending packets on subqueue
2281 * @dev: network device
2282 * @queue_index: sub queue index
2284 * Resume individual transmit queue of a device with multiple transmit queues.
2286 void netif_wake_subqueue(struct net_device
*dev
, u16 queue_index
)
2288 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
2290 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &txq
->state
)) {
2294 q
= rcu_dereference(txq
->qdisc
);
2295 __netif_schedule(q
);
2299 EXPORT_SYMBOL(netif_wake_subqueue
);
2301 void netif_tx_wake_queue(struct netdev_queue
*dev_queue
)
2303 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &dev_queue
->state
)) {
2307 q
= rcu_dereference(dev_queue
->qdisc
);
2308 __netif_schedule(q
);
2312 EXPORT_SYMBOL(netif_tx_wake_queue
);
2314 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2316 unsigned long flags
;
2318 if (likely(atomic_read(&skb
->users
) == 1)) {
2320 atomic_set(&skb
->users
, 0);
2321 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2324 get_kfree_skb_cb(skb
)->reason
= reason
;
2325 local_irq_save(flags
);
2326 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2327 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2328 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2329 local_irq_restore(flags
);
2331 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2333 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2335 if (in_irq() || irqs_disabled())
2336 __dev_kfree_skb_irq(skb
, reason
);
2340 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2344 * netif_device_detach - mark device as removed
2345 * @dev: network device
2347 * Mark device as removed from system and therefore no longer available.
2349 void netif_device_detach(struct net_device
*dev
)
2351 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2352 netif_running(dev
)) {
2353 netif_tx_stop_all_queues(dev
);
2356 EXPORT_SYMBOL(netif_device_detach
);
2359 * netif_device_attach - mark device as attached
2360 * @dev: network device
2362 * Mark device as attached from system and restart if needed.
2364 void netif_device_attach(struct net_device
*dev
)
2366 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2367 netif_running(dev
)) {
2368 netif_tx_wake_all_queues(dev
);
2369 __netdev_watchdog_up(dev
);
2372 EXPORT_SYMBOL(netif_device_attach
);
2375 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2376 * to be used as a distribution range.
2378 u16
__skb_tx_hash(const struct net_device
*dev
, struct sk_buff
*skb
,
2379 unsigned int num_tx_queues
)
2383 u16 qcount
= num_tx_queues
;
2385 if (skb_rx_queue_recorded(skb
)) {
2386 hash
= skb_get_rx_queue(skb
);
2387 while (unlikely(hash
>= num_tx_queues
))
2388 hash
-= num_tx_queues
;
2393 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2394 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2395 qcount
= dev
->tc_to_txq
[tc
].count
;
2398 return (u16
) reciprocal_scale(skb_get_hash(skb
), qcount
) + qoffset
;
2400 EXPORT_SYMBOL(__skb_tx_hash
);
2402 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2404 static const netdev_features_t null_features
= 0;
2405 struct net_device
*dev
= skb
->dev
;
2406 const char *driver
= "";
2408 if (!net_ratelimit())
2411 if (dev
&& dev
->dev
.parent
)
2412 driver
= dev_driver_string(dev
->dev
.parent
);
2414 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2415 "gso_type=%d ip_summed=%d\n",
2416 driver
, dev
? &dev
->features
: &null_features
,
2417 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2418 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2419 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2423 * Invalidate hardware checksum when packet is to be mangled, and
2424 * complete checksum manually on outgoing path.
2426 int skb_checksum_help(struct sk_buff
*skb
)
2429 int ret
= 0, offset
;
2431 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2432 goto out_set_summed
;
2434 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2435 skb_warn_bad_offload(skb
);
2439 /* Before computing a checksum, we should make sure no frag could
2440 * be modified by an external entity : checksum could be wrong.
2442 if (skb_has_shared_frag(skb
)) {
2443 ret
= __skb_linearize(skb
);
2448 offset
= skb_checksum_start_offset(skb
);
2449 BUG_ON(offset
>= skb_headlen(skb
));
2450 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2452 offset
+= skb
->csum_offset
;
2453 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2455 if (skb_cloned(skb
) &&
2456 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2457 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2462 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2464 skb
->ip_summed
= CHECKSUM_NONE
;
2468 EXPORT_SYMBOL(skb_checksum_help
);
2470 __be16
skb_network_protocol(struct sk_buff
*skb
, int *depth
)
2472 __be16 type
= skb
->protocol
;
2474 /* Tunnel gso handlers can set protocol to ethernet. */
2475 if (type
== htons(ETH_P_TEB
)) {
2478 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2481 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2482 type
= eth
->h_proto
;
2485 return __vlan_get_protocol(skb
, type
, depth
);
2489 * skb_mac_gso_segment - mac layer segmentation handler.
2490 * @skb: buffer to segment
2491 * @features: features for the output path (see dev->features)
2493 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2494 netdev_features_t features
)
2496 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2497 struct packet_offload
*ptype
;
2498 int vlan_depth
= skb
->mac_len
;
2499 __be16 type
= skb_network_protocol(skb
, &vlan_depth
);
2501 if (unlikely(!type
))
2502 return ERR_PTR(-EINVAL
);
2504 __skb_pull(skb
, vlan_depth
);
2507 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2508 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2509 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2515 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2519 EXPORT_SYMBOL(skb_mac_gso_segment
);
2522 /* openvswitch calls this on rx path, so we need a different check.
2524 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2527 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2529 return skb
->ip_summed
== CHECKSUM_NONE
;
2533 * __skb_gso_segment - Perform segmentation on skb.
2534 * @skb: buffer to segment
2535 * @features: features for the output path (see dev->features)
2536 * @tx_path: whether it is called in TX path
2538 * This function segments the given skb and returns a list of segments.
2540 * It may return NULL if the skb requires no segmentation. This is
2541 * only possible when GSO is used for verifying header integrity.
2543 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2544 netdev_features_t features
, bool tx_path
)
2546 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2549 skb_warn_bad_offload(skb
);
2551 err
= skb_cow_head(skb
, 0);
2553 return ERR_PTR(err
);
2556 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2557 SKB_GSO_CB(skb
)->encap_level
= 0;
2559 skb_reset_mac_header(skb
);
2560 skb_reset_mac_len(skb
);
2562 return skb_mac_gso_segment(skb
, features
);
2564 EXPORT_SYMBOL(__skb_gso_segment
);
2566 /* Take action when hardware reception checksum errors are detected. */
2568 void netdev_rx_csum_fault(struct net_device
*dev
)
2570 if (net_ratelimit()) {
2571 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2575 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2578 /* Actually, we should eliminate this check as soon as we know, that:
2579 * 1. IOMMU is present and allows to map all the memory.
2580 * 2. No high memory really exists on this machine.
2583 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2585 #ifdef CONFIG_HIGHMEM
2587 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2588 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2589 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2590 if (PageHighMem(skb_frag_page(frag
)))
2595 if (PCI_DMA_BUS_IS_PHYS
) {
2596 struct device
*pdev
= dev
->dev
.parent
;
2600 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2601 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2602 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2603 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2611 /* If MPLS offload request, verify we are testing hardware MPLS features
2612 * instead of standard features for the netdev.
2614 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2615 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2616 netdev_features_t features
,
2619 if (eth_p_mpls(type
))
2620 features
&= skb
->dev
->mpls_features
;
2625 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2626 netdev_features_t features
,
2633 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2634 netdev_features_t features
)
2639 type
= skb_network_protocol(skb
, &tmp
);
2640 features
= net_mpls_features(skb
, features
, type
);
2642 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2643 !can_checksum_protocol(features
, type
)) {
2644 features
&= ~NETIF_F_ALL_CSUM
;
2645 } else if (illegal_highdma(skb
->dev
, skb
)) {
2646 features
&= ~NETIF_F_SG
;
2652 netdev_features_t
passthru_features_check(struct sk_buff
*skb
,
2653 struct net_device
*dev
,
2654 netdev_features_t features
)
2658 EXPORT_SYMBOL(passthru_features_check
);
2660 static netdev_features_t
dflt_features_check(const struct sk_buff
*skb
,
2661 struct net_device
*dev
,
2662 netdev_features_t features
)
2664 return vlan_features_check(skb
, features
);
2667 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2669 struct net_device
*dev
= skb
->dev
;
2670 netdev_features_t features
= dev
->features
;
2671 u16 gso_segs
= skb_shinfo(skb
)->gso_segs
;
2673 if (gso_segs
> dev
->gso_max_segs
|| gso_segs
< dev
->gso_min_segs
)
2674 features
&= ~NETIF_F_GSO_MASK
;
2676 /* If encapsulation offload request, verify we are testing
2677 * hardware encapsulation features instead of standard
2678 * features for the netdev
2680 if (skb
->encapsulation
)
2681 features
&= dev
->hw_enc_features
;
2683 if (skb_vlan_tagged(skb
))
2684 features
= netdev_intersect_features(features
,
2685 dev
->vlan_features
|
2686 NETIF_F_HW_VLAN_CTAG_TX
|
2687 NETIF_F_HW_VLAN_STAG_TX
);
2689 if (dev
->netdev_ops
->ndo_features_check
)
2690 features
&= dev
->netdev_ops
->ndo_features_check(skb
, dev
,
2693 features
&= dflt_features_check(skb
, dev
, features
);
2695 return harmonize_features(skb
, features
);
2697 EXPORT_SYMBOL(netif_skb_features
);
2699 static int xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
2700 struct netdev_queue
*txq
, bool more
)
2705 if (!list_empty(&ptype_all
) || !list_empty(&dev
->ptype_all
))
2706 dev_queue_xmit_nit(skb
, dev
);
2709 trace_net_dev_start_xmit(skb
, dev
);
2710 rc
= netdev_start_xmit(skb
, dev
, txq
, more
);
2711 trace_net_dev_xmit(skb
, rc
, dev
, len
);
2716 struct sk_buff
*dev_hard_start_xmit(struct sk_buff
*first
, struct net_device
*dev
,
2717 struct netdev_queue
*txq
, int *ret
)
2719 struct sk_buff
*skb
= first
;
2720 int rc
= NETDEV_TX_OK
;
2723 struct sk_buff
*next
= skb
->next
;
2726 rc
= xmit_one(skb
, dev
, txq
, next
!= NULL
);
2727 if (unlikely(!dev_xmit_complete(rc
))) {
2733 if (netif_xmit_stopped(txq
) && skb
) {
2734 rc
= NETDEV_TX_BUSY
;
2744 static struct sk_buff
*validate_xmit_vlan(struct sk_buff
*skb
,
2745 netdev_features_t features
)
2747 if (skb_vlan_tag_present(skb
) &&
2748 !vlan_hw_offload_capable(features
, skb
->vlan_proto
))
2749 skb
= __vlan_hwaccel_push_inside(skb
);
2753 static struct sk_buff
*validate_xmit_skb(struct sk_buff
*skb
, struct net_device
*dev
)
2755 netdev_features_t features
;
2760 features
= netif_skb_features(skb
);
2761 skb
= validate_xmit_vlan(skb
, features
);
2765 if (netif_needs_gso(skb
, features
)) {
2766 struct sk_buff
*segs
;
2768 segs
= skb_gso_segment(skb
, features
);
2776 if (skb_needs_linearize(skb
, features
) &&
2777 __skb_linearize(skb
))
2780 /* If packet is not checksummed and device does not
2781 * support checksumming for this protocol, complete
2782 * checksumming here.
2784 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2785 if (skb
->encapsulation
)
2786 skb_set_inner_transport_header(skb
,
2787 skb_checksum_start_offset(skb
));
2789 skb_set_transport_header(skb
,
2790 skb_checksum_start_offset(skb
));
2791 if (!(features
& NETIF_F_ALL_CSUM
) &&
2792 skb_checksum_help(skb
))
2805 struct sk_buff
*validate_xmit_skb_list(struct sk_buff
*skb
, struct net_device
*dev
)
2807 struct sk_buff
*next
, *head
= NULL
, *tail
;
2809 for (; skb
!= NULL
; skb
= next
) {
2813 /* in case skb wont be segmented, point to itself */
2816 skb
= validate_xmit_skb(skb
, dev
);
2824 /* If skb was segmented, skb->prev points to
2825 * the last segment. If not, it still contains skb.
2832 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2834 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2836 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2838 /* To get more precise estimation of bytes sent on wire,
2839 * we add to pkt_len the headers size of all segments
2841 if (shinfo
->gso_size
) {
2842 unsigned int hdr_len
;
2843 u16 gso_segs
= shinfo
->gso_segs
;
2845 /* mac layer + network layer */
2846 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2848 /* + transport layer */
2849 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2850 hdr_len
+= tcp_hdrlen(skb
);
2852 hdr_len
+= sizeof(struct udphdr
);
2854 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2855 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2858 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2862 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2863 struct net_device
*dev
,
2864 struct netdev_queue
*txq
)
2866 spinlock_t
*root_lock
= qdisc_lock(q
);
2870 qdisc_pkt_len_init(skb
);
2871 qdisc_calculate_pkt_len(skb
, q
);
2873 * Heuristic to force contended enqueues to serialize on a
2874 * separate lock before trying to get qdisc main lock.
2875 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2876 * often and dequeue packets faster.
2878 contended
= qdisc_is_running(q
);
2879 if (unlikely(contended
))
2880 spin_lock(&q
->busylock
);
2882 spin_lock(root_lock
);
2883 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2886 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2887 qdisc_run_begin(q
)) {
2889 * This is a work-conserving queue; there are no old skbs
2890 * waiting to be sent out; and the qdisc is not running -
2891 * xmit the skb directly.
2894 qdisc_bstats_update(q
, skb
);
2896 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
, true)) {
2897 if (unlikely(contended
)) {
2898 spin_unlock(&q
->busylock
);
2905 rc
= NET_XMIT_SUCCESS
;
2907 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2908 if (qdisc_run_begin(q
)) {
2909 if (unlikely(contended
)) {
2910 spin_unlock(&q
->busylock
);
2916 spin_unlock(root_lock
);
2917 if (unlikely(contended
))
2918 spin_unlock(&q
->busylock
);
2922 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2923 static void skb_update_prio(struct sk_buff
*skb
)
2925 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2927 if (!skb
->priority
&& skb
->sk
&& map
) {
2928 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2930 if (prioidx
< map
->priomap_len
)
2931 skb
->priority
= map
->priomap
[prioidx
];
2935 #define skb_update_prio(skb)
2938 DEFINE_PER_CPU(int, xmit_recursion
);
2939 EXPORT_SYMBOL(xmit_recursion
);
2941 #define RECURSION_LIMIT 10
2944 * dev_loopback_xmit - loop back @skb
2945 * @skb: buffer to transmit
2947 int dev_loopback_xmit(struct sock
*sk
, struct sk_buff
*skb
)
2949 skb_reset_mac_header(skb
);
2950 __skb_pull(skb
, skb_network_offset(skb
));
2951 skb
->pkt_type
= PACKET_LOOPBACK
;
2952 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2953 WARN_ON(!skb_dst(skb
));
2958 EXPORT_SYMBOL(dev_loopback_xmit
);
2960 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
2963 struct xps_dev_maps
*dev_maps
;
2964 struct xps_map
*map
;
2965 int queue_index
= -1;
2968 dev_maps
= rcu_dereference(dev
->xps_maps
);
2970 map
= rcu_dereference(
2971 dev_maps
->cpu_map
[skb
->sender_cpu
- 1]);
2974 queue_index
= map
->queues
[0];
2976 queue_index
= map
->queues
[reciprocal_scale(skb_get_hash(skb
),
2978 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
2990 static u16
__netdev_pick_tx(struct net_device
*dev
, struct sk_buff
*skb
)
2992 struct sock
*sk
= skb
->sk
;
2993 int queue_index
= sk_tx_queue_get(sk
);
2995 if (queue_index
< 0 || skb
->ooo_okay
||
2996 queue_index
>= dev
->real_num_tx_queues
) {
2997 int new_index
= get_xps_queue(dev
, skb
);
2999 new_index
= skb_tx_hash(dev
, skb
);
3001 if (queue_index
!= new_index
&& sk
&&
3002 rcu_access_pointer(sk
->sk_dst_cache
))
3003 sk_tx_queue_set(sk
, new_index
);
3005 queue_index
= new_index
;
3011 struct netdev_queue
*netdev_pick_tx(struct net_device
*dev
,
3012 struct sk_buff
*skb
,
3015 int queue_index
= 0;
3018 if (skb
->sender_cpu
== 0)
3019 skb
->sender_cpu
= raw_smp_processor_id() + 1;
3022 if (dev
->real_num_tx_queues
!= 1) {
3023 const struct net_device_ops
*ops
= dev
->netdev_ops
;
3024 if (ops
->ndo_select_queue
)
3025 queue_index
= ops
->ndo_select_queue(dev
, skb
, accel_priv
,
3028 queue_index
= __netdev_pick_tx(dev
, skb
);
3031 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
3034 skb_set_queue_mapping(skb
, queue_index
);
3035 return netdev_get_tx_queue(dev
, queue_index
);
3039 * __dev_queue_xmit - transmit a buffer
3040 * @skb: buffer to transmit
3041 * @accel_priv: private data used for L2 forwarding offload
3043 * Queue a buffer for transmission to a network device. The caller must
3044 * have set the device and priority and built the buffer before calling
3045 * this function. The function can be called from an interrupt.
3047 * A negative errno code is returned on a failure. A success does not
3048 * guarantee the frame will be transmitted as it may be dropped due
3049 * to congestion or traffic shaping.
3051 * -----------------------------------------------------------------------------------
3052 * I notice this method can also return errors from the queue disciplines,
3053 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3056 * Regardless of the return value, the skb is consumed, so it is currently
3057 * difficult to retry a send to this method. (You can bump the ref count
3058 * before sending to hold a reference for retry if you are careful.)
3060 * When calling this method, interrupts MUST be enabled. This is because
3061 * the BH enable code must have IRQs enabled so that it will not deadlock.
3064 static int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
3066 struct net_device
*dev
= skb
->dev
;
3067 struct netdev_queue
*txq
;
3071 skb_reset_mac_header(skb
);
3073 if (unlikely(skb_shinfo(skb
)->tx_flags
& SKBTX_SCHED_TSTAMP
))
3074 __skb_tstamp_tx(skb
, NULL
, skb
->sk
, SCM_TSTAMP_SCHED
);
3076 /* Disable soft irqs for various locks below. Also
3077 * stops preemption for RCU.
3081 skb_update_prio(skb
);
3083 /* If device/qdisc don't need skb->dst, release it right now while
3084 * its hot in this cpu cache.
3086 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
3091 #ifdef CONFIG_NET_SWITCHDEV
3092 /* Don't forward if offload device already forwarded */
3093 if (skb
->offload_fwd_mark
&&
3094 skb
->offload_fwd_mark
== dev
->offload_fwd_mark
) {
3096 rc
= NET_XMIT_SUCCESS
;
3101 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
3102 q
= rcu_dereference_bh(txq
->qdisc
);
3104 #ifdef CONFIG_NET_CLS_ACT
3105 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
3107 trace_net_dev_queue(skb
);
3109 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
3113 /* The device has no queue. Common case for software devices:
3114 loopback, all the sorts of tunnels...
3116 Really, it is unlikely that netif_tx_lock protection is necessary
3117 here. (f.e. loopback and IP tunnels are clean ignoring statistics
3119 However, it is possible, that they rely on protection
3122 Check this and shot the lock. It is not prone from deadlocks.
3123 Either shot noqueue qdisc, it is even simpler 8)
3125 if (dev
->flags
& IFF_UP
) {
3126 int cpu
= smp_processor_id(); /* ok because BHs are off */
3128 if (txq
->xmit_lock_owner
!= cpu
) {
3130 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
3131 goto recursion_alert
;
3133 skb
= validate_xmit_skb(skb
, dev
);
3137 HARD_TX_LOCK(dev
, txq
, cpu
);
3139 if (!netif_xmit_stopped(txq
)) {
3140 __this_cpu_inc(xmit_recursion
);
3141 skb
= dev_hard_start_xmit(skb
, dev
, txq
, &rc
);
3142 __this_cpu_dec(xmit_recursion
);
3143 if (dev_xmit_complete(rc
)) {
3144 HARD_TX_UNLOCK(dev
, txq
);
3148 HARD_TX_UNLOCK(dev
, txq
);
3149 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3152 /* Recursion is detected! It is possible,
3156 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3163 rcu_read_unlock_bh();
3165 atomic_long_inc(&dev
->tx_dropped
);
3166 kfree_skb_list(skb
);
3169 rcu_read_unlock_bh();
3173 int dev_queue_xmit_sk(struct sock
*sk
, struct sk_buff
*skb
)
3175 return __dev_queue_xmit(skb
, NULL
);
3177 EXPORT_SYMBOL(dev_queue_xmit_sk
);
3179 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
3181 return __dev_queue_xmit(skb
, accel_priv
);
3183 EXPORT_SYMBOL(dev_queue_xmit_accel
);
3186 /*=======================================================================
3188 =======================================================================*/
3190 int netdev_max_backlog __read_mostly
= 1000;
3191 EXPORT_SYMBOL(netdev_max_backlog
);
3193 int netdev_tstamp_prequeue __read_mostly
= 1;
3194 int netdev_budget __read_mostly
= 300;
3195 int weight_p __read_mostly
= 64; /* old backlog weight */
3197 /* Called with irq disabled */
3198 static inline void ____napi_schedule(struct softnet_data
*sd
,
3199 struct napi_struct
*napi
)
3201 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
3202 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3207 /* One global table that all flow-based protocols share. */
3208 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
3209 EXPORT_SYMBOL(rps_sock_flow_table
);
3210 u32 rps_cpu_mask __read_mostly
;
3211 EXPORT_SYMBOL(rps_cpu_mask
);
3213 struct static_key rps_needed __read_mostly
;
3215 static struct rps_dev_flow
*
3216 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3217 struct rps_dev_flow
*rflow
, u16 next_cpu
)
3219 if (next_cpu
< nr_cpu_ids
) {
3220 #ifdef CONFIG_RFS_ACCEL
3221 struct netdev_rx_queue
*rxqueue
;
3222 struct rps_dev_flow_table
*flow_table
;
3223 struct rps_dev_flow
*old_rflow
;
3228 /* Should we steer this flow to a different hardware queue? */
3229 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
3230 !(dev
->features
& NETIF_F_NTUPLE
))
3232 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
3233 if (rxq_index
== skb_get_rx_queue(skb
))
3236 rxqueue
= dev
->_rx
+ rxq_index
;
3237 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3240 flow_id
= skb_get_hash(skb
) & flow_table
->mask
;
3241 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
3242 rxq_index
, flow_id
);
3246 rflow
= &flow_table
->flows
[flow_id
];
3248 if (old_rflow
->filter
== rflow
->filter
)
3249 old_rflow
->filter
= RPS_NO_FILTER
;
3253 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
3256 rflow
->cpu
= next_cpu
;
3261 * get_rps_cpu is called from netif_receive_skb and returns the target
3262 * CPU from the RPS map of the receiving queue for a given skb.
3263 * rcu_read_lock must be held on entry.
3265 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3266 struct rps_dev_flow
**rflowp
)
3268 const struct rps_sock_flow_table
*sock_flow_table
;
3269 struct netdev_rx_queue
*rxqueue
= dev
->_rx
;
3270 struct rps_dev_flow_table
*flow_table
;
3271 struct rps_map
*map
;
3276 if (skb_rx_queue_recorded(skb
)) {
3277 u16 index
= skb_get_rx_queue(skb
);
3279 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
3280 WARN_ONCE(dev
->real_num_rx_queues
> 1,
3281 "%s received packet on queue %u, but number "
3282 "of RX queues is %u\n",
3283 dev
->name
, index
, dev
->real_num_rx_queues
);
3289 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3291 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3292 map
= rcu_dereference(rxqueue
->rps_map
);
3293 if (!flow_table
&& !map
)
3296 skb_reset_network_header(skb
);
3297 hash
= skb_get_hash(skb
);
3301 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3302 if (flow_table
&& sock_flow_table
) {
3303 struct rps_dev_flow
*rflow
;
3307 /* First check into global flow table if there is a match */
3308 ident
= sock_flow_table
->ents
[hash
& sock_flow_table
->mask
];
3309 if ((ident
^ hash
) & ~rps_cpu_mask
)
3312 next_cpu
= ident
& rps_cpu_mask
;
3314 /* OK, now we know there is a match,
3315 * we can look at the local (per receive queue) flow table
3317 rflow
= &flow_table
->flows
[hash
& flow_table
->mask
];
3321 * If the desired CPU (where last recvmsg was done) is
3322 * different from current CPU (one in the rx-queue flow
3323 * table entry), switch if one of the following holds:
3324 * - Current CPU is unset (>= nr_cpu_ids).
3325 * - Current CPU is offline.
3326 * - The current CPU's queue tail has advanced beyond the
3327 * last packet that was enqueued using this table entry.
3328 * This guarantees that all previous packets for the flow
3329 * have been dequeued, thus preserving in order delivery.
3331 if (unlikely(tcpu
!= next_cpu
) &&
3332 (tcpu
>= nr_cpu_ids
|| !cpu_online(tcpu
) ||
3333 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3334 rflow
->last_qtail
)) >= 0)) {
3336 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3339 if (tcpu
< nr_cpu_ids
&& cpu_online(tcpu
)) {
3349 tcpu
= map
->cpus
[reciprocal_scale(hash
, map
->len
)];
3350 if (cpu_online(tcpu
)) {
3360 #ifdef CONFIG_RFS_ACCEL
3363 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3364 * @dev: Device on which the filter was set
3365 * @rxq_index: RX queue index
3366 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3367 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3369 * Drivers that implement ndo_rx_flow_steer() should periodically call
3370 * this function for each installed filter and remove the filters for
3371 * which it returns %true.
3373 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3374 u32 flow_id
, u16 filter_id
)
3376 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3377 struct rps_dev_flow_table
*flow_table
;
3378 struct rps_dev_flow
*rflow
;
3383 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3384 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3385 rflow
= &flow_table
->flows
[flow_id
];
3386 cpu
= ACCESS_ONCE(rflow
->cpu
);
3387 if (rflow
->filter
== filter_id
&& cpu
< nr_cpu_ids
&&
3388 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3389 rflow
->last_qtail
) <
3390 (int)(10 * flow_table
->mask
)))
3396 EXPORT_SYMBOL(rps_may_expire_flow
);
3398 #endif /* CONFIG_RFS_ACCEL */
3400 /* Called from hardirq (IPI) context */
3401 static void rps_trigger_softirq(void *data
)
3403 struct softnet_data
*sd
= data
;
3405 ____napi_schedule(sd
, &sd
->backlog
);
3409 #endif /* CONFIG_RPS */
3412 * Check if this softnet_data structure is another cpu one
3413 * If yes, queue it to our IPI list and return 1
3416 static int rps_ipi_queued(struct softnet_data
*sd
)
3419 struct softnet_data
*mysd
= this_cpu_ptr(&softnet_data
);
3422 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3423 mysd
->rps_ipi_list
= sd
;
3425 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3428 #endif /* CONFIG_RPS */
3432 #ifdef CONFIG_NET_FLOW_LIMIT
3433 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3436 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3438 #ifdef CONFIG_NET_FLOW_LIMIT
3439 struct sd_flow_limit
*fl
;
3440 struct softnet_data
*sd
;
3441 unsigned int old_flow
, new_flow
;
3443 if (qlen
< (netdev_max_backlog
>> 1))
3446 sd
= this_cpu_ptr(&softnet_data
);
3449 fl
= rcu_dereference(sd
->flow_limit
);
3451 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3452 old_flow
= fl
->history
[fl
->history_head
];
3453 fl
->history
[fl
->history_head
] = new_flow
;
3456 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3458 if (likely(fl
->buckets
[old_flow
]))
3459 fl
->buckets
[old_flow
]--;
3461 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3473 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3474 * queue (may be a remote CPU queue).
3476 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3477 unsigned int *qtail
)
3479 struct softnet_data
*sd
;
3480 unsigned long flags
;
3483 sd
= &per_cpu(softnet_data
, cpu
);
3485 local_irq_save(flags
);
3488 if (!netif_running(skb
->dev
))
3490 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3491 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3494 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3495 input_queue_tail_incr_save(sd
, qtail
);
3497 local_irq_restore(flags
);
3498 return NET_RX_SUCCESS
;
3501 /* Schedule NAPI for backlog device
3502 * We can use non atomic operation since we own the queue lock
3504 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3505 if (!rps_ipi_queued(sd
))
3506 ____napi_schedule(sd
, &sd
->backlog
);
3515 local_irq_restore(flags
);
3517 atomic_long_inc(&skb
->dev
->rx_dropped
);
3522 static int netif_rx_internal(struct sk_buff
*skb
)
3526 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3528 trace_netif_rx(skb
);
3530 if (static_key_false(&rps_needed
)) {
3531 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3537 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3539 cpu
= smp_processor_id();
3541 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3549 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3556 * netif_rx - post buffer to the network code
3557 * @skb: buffer to post
3559 * This function receives a packet from a device driver and queues it for
3560 * the upper (protocol) levels to process. It always succeeds. The buffer
3561 * may be dropped during processing for congestion control or by the
3565 * NET_RX_SUCCESS (no congestion)
3566 * NET_RX_DROP (packet was dropped)
3570 int netif_rx(struct sk_buff
*skb
)
3572 trace_netif_rx_entry(skb
);
3574 return netif_rx_internal(skb
);
3576 EXPORT_SYMBOL(netif_rx
);
3578 int netif_rx_ni(struct sk_buff
*skb
)
3582 trace_netif_rx_ni_entry(skb
);
3585 err
= netif_rx_internal(skb
);
3586 if (local_softirq_pending())
3592 EXPORT_SYMBOL(netif_rx_ni
);
3594 static void net_tx_action(struct softirq_action
*h
)
3596 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
3598 if (sd
->completion_queue
) {
3599 struct sk_buff
*clist
;
3601 local_irq_disable();
3602 clist
= sd
->completion_queue
;
3603 sd
->completion_queue
= NULL
;
3607 struct sk_buff
*skb
= clist
;
3608 clist
= clist
->next
;
3610 WARN_ON(atomic_read(&skb
->users
));
3611 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
3612 trace_consume_skb(skb
);
3614 trace_kfree_skb(skb
, net_tx_action
);
3619 if (sd
->output_queue
) {
3622 local_irq_disable();
3623 head
= sd
->output_queue
;
3624 sd
->output_queue
= NULL
;
3625 sd
->output_queue_tailp
= &sd
->output_queue
;
3629 struct Qdisc
*q
= head
;
3630 spinlock_t
*root_lock
;
3632 head
= head
->next_sched
;
3634 root_lock
= qdisc_lock(q
);
3635 if (spin_trylock(root_lock
)) {
3636 smp_mb__before_atomic();
3637 clear_bit(__QDISC_STATE_SCHED
,
3640 spin_unlock(root_lock
);
3642 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3644 __netif_reschedule(q
);
3646 smp_mb__before_atomic();
3647 clear_bit(__QDISC_STATE_SCHED
,
3655 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3656 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3657 /* This hook is defined here for ATM LANE */
3658 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3659 unsigned char *addr
) __read_mostly
;
3660 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3663 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3664 struct packet_type
**pt_prev
,
3665 int *ret
, struct net_device
*orig_dev
)
3667 #ifdef CONFIG_NET_CLS_ACT
3668 struct tcf_proto
*cl
= rcu_dereference_bh(skb
->dev
->ingress_cl_list
);
3669 struct tcf_result cl_res
;
3671 /* If there's at least one ingress present somewhere (so
3672 * we get here via enabled static key), remaining devices
3673 * that are not configured with an ingress qdisc will bail
3679 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3683 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
3684 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3685 qdisc_bstats_cpu_update(cl
->q
, skb
);
3687 switch (tc_classify(skb
, cl
, &cl_res
, false)) {
3689 case TC_ACT_RECLASSIFY
:
3690 skb
->tc_index
= TC_H_MIN(cl_res
.classid
);
3693 qdisc_qstats_cpu_drop(cl
->q
);
3701 #endif /* CONFIG_NET_CLS_ACT */
3706 * netdev_rx_handler_register - register receive handler
3707 * @dev: device to register a handler for
3708 * @rx_handler: receive handler to register
3709 * @rx_handler_data: data pointer that is used by rx handler
3711 * Register a receive handler for a device. This handler will then be
3712 * called from __netif_receive_skb. A negative errno code is returned
3715 * The caller must hold the rtnl_mutex.
3717 * For a general description of rx_handler, see enum rx_handler_result.
3719 int netdev_rx_handler_register(struct net_device
*dev
,
3720 rx_handler_func_t
*rx_handler
,
3721 void *rx_handler_data
)
3725 if (dev
->rx_handler
)
3728 /* Note: rx_handler_data must be set before rx_handler */
3729 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3730 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3734 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3737 * netdev_rx_handler_unregister - unregister receive handler
3738 * @dev: device to unregister a handler from
3740 * Unregister a receive handler from a device.
3742 * The caller must hold the rtnl_mutex.
3744 void netdev_rx_handler_unregister(struct net_device
*dev
)
3748 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3749 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3750 * section has a guarantee to see a non NULL rx_handler_data
3754 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3756 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3759 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3760 * the special handling of PFMEMALLOC skbs.
3762 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3764 switch (skb
->protocol
) {
3765 case htons(ETH_P_ARP
):
3766 case htons(ETH_P_IP
):
3767 case htons(ETH_P_IPV6
):
3768 case htons(ETH_P_8021Q
):
3769 case htons(ETH_P_8021AD
):
3776 static inline int nf_ingress(struct sk_buff
*skb
, struct packet_type
**pt_prev
,
3777 int *ret
, struct net_device
*orig_dev
)
3779 #ifdef CONFIG_NETFILTER_INGRESS
3780 if (nf_hook_ingress_active(skb
)) {
3782 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3786 return nf_hook_ingress(skb
);
3788 #endif /* CONFIG_NETFILTER_INGRESS */
3792 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3794 struct packet_type
*ptype
, *pt_prev
;
3795 rx_handler_func_t
*rx_handler
;
3796 struct net_device
*orig_dev
;
3797 bool deliver_exact
= false;
3798 int ret
= NET_RX_DROP
;
3801 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3803 trace_netif_receive_skb(skb
);
3805 orig_dev
= skb
->dev
;
3807 skb_reset_network_header(skb
);
3808 if (!skb_transport_header_was_set(skb
))
3809 skb_reset_transport_header(skb
);
3810 skb_reset_mac_len(skb
);
3815 skb
->skb_iif
= skb
->dev
->ifindex
;
3817 __this_cpu_inc(softnet_data
.processed
);
3819 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
3820 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
3821 skb
= skb_vlan_untag(skb
);
3826 #ifdef CONFIG_NET_CLS_ACT
3827 if (skb
->tc_verd
& TC_NCLS
) {
3828 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3836 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3838 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3842 list_for_each_entry_rcu(ptype
, &skb
->dev
->ptype_all
, list
) {
3844 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3849 #ifdef CONFIG_NET_INGRESS
3850 if (static_key_false(&ingress_needed
)) {
3851 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3855 if (nf_ingress(skb
, &pt_prev
, &ret
, orig_dev
) < 0)
3859 #ifdef CONFIG_NET_CLS_ACT
3863 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3866 if (skb_vlan_tag_present(skb
)) {
3868 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3871 if (vlan_do_receive(&skb
))
3873 else if (unlikely(!skb
))
3877 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3880 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3883 switch (rx_handler(&skb
)) {
3884 case RX_HANDLER_CONSUMED
:
3885 ret
= NET_RX_SUCCESS
;
3887 case RX_HANDLER_ANOTHER
:
3889 case RX_HANDLER_EXACT
:
3890 deliver_exact
= true;
3891 case RX_HANDLER_PASS
:
3898 if (unlikely(skb_vlan_tag_present(skb
))) {
3899 if (skb_vlan_tag_get_id(skb
))
3900 skb
->pkt_type
= PACKET_OTHERHOST
;
3901 /* Note: we might in the future use prio bits
3902 * and set skb->priority like in vlan_do_receive()
3903 * For the time being, just ignore Priority Code Point
3908 type
= skb
->protocol
;
3910 /* deliver only exact match when indicated */
3911 if (likely(!deliver_exact
)) {
3912 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3913 &ptype_base
[ntohs(type
) &
3917 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3918 &orig_dev
->ptype_specific
);
3920 if (unlikely(skb
->dev
!= orig_dev
)) {
3921 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3922 &skb
->dev
->ptype_specific
);
3926 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3929 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3932 atomic_long_inc(&skb
->dev
->rx_dropped
);
3934 /* Jamal, now you will not able to escape explaining
3935 * me how you were going to use this. :-)
3944 static int __netif_receive_skb(struct sk_buff
*skb
)
3948 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3949 unsigned long pflags
= current
->flags
;
3952 * PFMEMALLOC skbs are special, they should
3953 * - be delivered to SOCK_MEMALLOC sockets only
3954 * - stay away from userspace
3955 * - have bounded memory usage
3957 * Use PF_MEMALLOC as this saves us from propagating the allocation
3958 * context down to all allocation sites.
3960 current
->flags
|= PF_MEMALLOC
;
3961 ret
= __netif_receive_skb_core(skb
, true);
3962 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3964 ret
= __netif_receive_skb_core(skb
, false);
3969 static int netif_receive_skb_internal(struct sk_buff
*skb
)
3973 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3975 if (skb_defer_rx_timestamp(skb
))
3976 return NET_RX_SUCCESS
;
3981 if (static_key_false(&rps_needed
)) {
3982 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3983 int cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3986 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3992 ret
= __netif_receive_skb(skb
);
3998 * netif_receive_skb - process receive buffer from network
3999 * @skb: buffer to process
4001 * netif_receive_skb() is the main receive data processing function.
4002 * It always succeeds. The buffer may be dropped during processing
4003 * for congestion control or by the protocol layers.
4005 * This function may only be called from softirq context and interrupts
4006 * should be enabled.
4008 * Return values (usually ignored):
4009 * NET_RX_SUCCESS: no congestion
4010 * NET_RX_DROP: packet was dropped
4012 int netif_receive_skb_sk(struct sock
*sk
, struct sk_buff
*skb
)
4014 trace_netif_receive_skb_entry(skb
);
4016 return netif_receive_skb_internal(skb
);
4018 EXPORT_SYMBOL(netif_receive_skb_sk
);
4020 /* Network device is going away, flush any packets still pending
4021 * Called with irqs disabled.
4023 static void flush_backlog(void *arg
)
4025 struct net_device
*dev
= arg
;
4026 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4027 struct sk_buff
*skb
, *tmp
;
4030 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
4031 if (skb
->dev
== dev
) {
4032 __skb_unlink(skb
, &sd
->input_pkt_queue
);
4034 input_queue_head_incr(sd
);
4039 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
4040 if (skb
->dev
== dev
) {
4041 __skb_unlink(skb
, &sd
->process_queue
);
4043 input_queue_head_incr(sd
);
4048 static int napi_gro_complete(struct sk_buff
*skb
)
4050 struct packet_offload
*ptype
;
4051 __be16 type
= skb
->protocol
;
4052 struct list_head
*head
= &offload_base
;
4055 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
4057 if (NAPI_GRO_CB(skb
)->count
== 1) {
4058 skb_shinfo(skb
)->gso_size
= 0;
4063 list_for_each_entry_rcu(ptype
, head
, list
) {
4064 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4067 err
= ptype
->callbacks
.gro_complete(skb
, 0);
4073 WARN_ON(&ptype
->list
== head
);
4075 return NET_RX_SUCCESS
;
4079 return netif_receive_skb_internal(skb
);
4082 /* napi->gro_list contains packets ordered by age.
4083 * youngest packets at the head of it.
4084 * Complete skbs in reverse order to reduce latencies.
4086 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
4088 struct sk_buff
*skb
, *prev
= NULL
;
4090 /* scan list and build reverse chain */
4091 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
4096 for (skb
= prev
; skb
; skb
= prev
) {
4099 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
4103 napi_gro_complete(skb
);
4107 napi
->gro_list
= NULL
;
4109 EXPORT_SYMBOL(napi_gro_flush
);
4111 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
4114 unsigned int maclen
= skb
->dev
->hard_header_len
;
4115 u32 hash
= skb_get_hash_raw(skb
);
4117 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
4118 unsigned long diffs
;
4120 NAPI_GRO_CB(p
)->flush
= 0;
4122 if (hash
!= skb_get_hash_raw(p
)) {
4123 NAPI_GRO_CB(p
)->same_flow
= 0;
4127 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
4128 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
4129 if (maclen
== ETH_HLEN
)
4130 diffs
|= compare_ether_header(skb_mac_header(p
),
4131 skb_mac_header(skb
));
4133 diffs
= memcmp(skb_mac_header(p
),
4134 skb_mac_header(skb
),
4136 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
4140 static void skb_gro_reset_offset(struct sk_buff
*skb
)
4142 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4143 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
4145 NAPI_GRO_CB(skb
)->data_offset
= 0;
4146 NAPI_GRO_CB(skb
)->frag0
= NULL
;
4147 NAPI_GRO_CB(skb
)->frag0_len
= 0;
4149 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
4151 !PageHighMem(skb_frag_page(frag0
))) {
4152 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
4153 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
4157 static void gro_pull_from_frag0(struct sk_buff
*skb
, int grow
)
4159 struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4161 BUG_ON(skb
->end
- skb
->tail
< grow
);
4163 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
4165 skb
->data_len
-= grow
;
4168 pinfo
->frags
[0].page_offset
+= grow
;
4169 skb_frag_size_sub(&pinfo
->frags
[0], grow
);
4171 if (unlikely(!skb_frag_size(&pinfo
->frags
[0]))) {
4172 skb_frag_unref(skb
, 0);
4173 memmove(pinfo
->frags
, pinfo
->frags
+ 1,
4174 --pinfo
->nr_frags
* sizeof(pinfo
->frags
[0]));
4178 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4180 struct sk_buff
**pp
= NULL
;
4181 struct packet_offload
*ptype
;
4182 __be16 type
= skb
->protocol
;
4183 struct list_head
*head
= &offload_base
;
4185 enum gro_result ret
;
4188 if (!(skb
->dev
->features
& NETIF_F_GRO
))
4191 if (skb_is_gso(skb
) || skb_has_frag_list(skb
) || skb
->csum_bad
)
4194 gro_list_prepare(napi
, skb
);
4197 list_for_each_entry_rcu(ptype
, head
, list
) {
4198 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4201 skb_set_network_header(skb
, skb_gro_offset(skb
));
4202 skb_reset_mac_len(skb
);
4203 NAPI_GRO_CB(skb
)->same_flow
= 0;
4204 NAPI_GRO_CB(skb
)->flush
= 0;
4205 NAPI_GRO_CB(skb
)->free
= 0;
4206 NAPI_GRO_CB(skb
)->udp_mark
= 0;
4207 NAPI_GRO_CB(skb
)->gro_remcsum_start
= 0;
4209 /* Setup for GRO checksum validation */
4210 switch (skb
->ip_summed
) {
4211 case CHECKSUM_COMPLETE
:
4212 NAPI_GRO_CB(skb
)->csum
= skb
->csum
;
4213 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4214 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4216 case CHECKSUM_UNNECESSARY
:
4217 NAPI_GRO_CB(skb
)->csum_cnt
= skb
->csum_level
+ 1;
4218 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4221 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4222 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4225 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
4230 if (&ptype
->list
== head
)
4233 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
4234 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
4237 struct sk_buff
*nskb
= *pp
;
4241 napi_gro_complete(nskb
);
4248 if (NAPI_GRO_CB(skb
)->flush
)
4251 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
4252 struct sk_buff
*nskb
= napi
->gro_list
;
4254 /* locate the end of the list to select the 'oldest' flow */
4255 while (nskb
->next
) {
4261 napi_gro_complete(nskb
);
4265 NAPI_GRO_CB(skb
)->count
= 1;
4266 NAPI_GRO_CB(skb
)->age
= jiffies
;
4267 NAPI_GRO_CB(skb
)->last
= skb
;
4268 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
4269 skb
->next
= napi
->gro_list
;
4270 napi
->gro_list
= skb
;
4274 grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
4276 gro_pull_from_frag0(skb
, grow
);
4285 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
4287 struct list_head
*offload_head
= &offload_base
;
4288 struct packet_offload
*ptype
;
4290 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4291 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4297 EXPORT_SYMBOL(gro_find_receive_by_type
);
4299 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
4301 struct list_head
*offload_head
= &offload_base
;
4302 struct packet_offload
*ptype
;
4304 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4305 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4311 EXPORT_SYMBOL(gro_find_complete_by_type
);
4313 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
4317 if (netif_receive_skb_internal(skb
))
4325 case GRO_MERGED_FREE
:
4326 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
4327 kmem_cache_free(skbuff_head_cache
, skb
);
4340 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4342 trace_napi_gro_receive_entry(skb
);
4344 skb_gro_reset_offset(skb
);
4346 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4348 EXPORT_SYMBOL(napi_gro_receive
);
4350 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4352 if (unlikely(skb
->pfmemalloc
)) {
4356 __skb_pull(skb
, skb_headlen(skb
));
4357 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4358 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
4360 skb
->dev
= napi
->dev
;
4362 skb
->encapsulation
= 0;
4363 skb_shinfo(skb
)->gso_type
= 0;
4364 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
4369 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
4371 struct sk_buff
*skb
= napi
->skb
;
4374 skb
= napi_alloc_skb(napi
, GRO_MAX_HEAD
);
4379 EXPORT_SYMBOL(napi_get_frags
);
4381 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
4382 struct sk_buff
*skb
,
4388 __skb_push(skb
, ETH_HLEN
);
4389 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4390 if (ret
== GRO_NORMAL
&& netif_receive_skb_internal(skb
))
4395 case GRO_MERGED_FREE
:
4396 napi_reuse_skb(napi
, skb
);
4406 /* Upper GRO stack assumes network header starts at gro_offset=0
4407 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4408 * We copy ethernet header into skb->data to have a common layout.
4410 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4412 struct sk_buff
*skb
= napi
->skb
;
4413 const struct ethhdr
*eth
;
4414 unsigned int hlen
= sizeof(*eth
);
4418 skb_reset_mac_header(skb
);
4419 skb_gro_reset_offset(skb
);
4421 eth
= skb_gro_header_fast(skb
, 0);
4422 if (unlikely(skb_gro_header_hard(skb
, hlen
))) {
4423 eth
= skb_gro_header_slow(skb
, hlen
, 0);
4424 if (unlikely(!eth
)) {
4425 napi_reuse_skb(napi
, skb
);
4429 gro_pull_from_frag0(skb
, hlen
);
4430 NAPI_GRO_CB(skb
)->frag0
+= hlen
;
4431 NAPI_GRO_CB(skb
)->frag0_len
-= hlen
;
4433 __skb_pull(skb
, hlen
);
4436 * This works because the only protocols we care about don't require
4438 * We'll fix it up properly in napi_frags_finish()
4440 skb
->protocol
= eth
->h_proto
;
4445 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4447 struct sk_buff
*skb
= napi_frags_skb(napi
);
4452 trace_napi_gro_frags_entry(skb
);
4454 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4456 EXPORT_SYMBOL(napi_gro_frags
);
4458 /* Compute the checksum from gro_offset and return the folded value
4459 * after adding in any pseudo checksum.
4461 __sum16
__skb_gro_checksum_complete(struct sk_buff
*skb
)
4466 wsum
= skb_checksum(skb
, skb_gro_offset(skb
), skb_gro_len(skb
), 0);
4468 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4469 sum
= csum_fold(csum_add(NAPI_GRO_CB(skb
)->csum
, wsum
));
4471 if (unlikely(skb
->ip_summed
== CHECKSUM_COMPLETE
) &&
4472 !skb
->csum_complete_sw
)
4473 netdev_rx_csum_fault(skb
->dev
);
4476 NAPI_GRO_CB(skb
)->csum
= wsum
;
4477 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4481 EXPORT_SYMBOL(__skb_gro_checksum_complete
);
4484 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4485 * Note: called with local irq disabled, but exits with local irq enabled.
4487 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4490 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4493 sd
->rps_ipi_list
= NULL
;
4497 /* Send pending IPI's to kick RPS processing on remote cpus. */
4499 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4501 if (cpu_online(remsd
->cpu
))
4502 smp_call_function_single_async(remsd
->cpu
,
4511 static bool sd_has_rps_ipi_waiting(struct softnet_data
*sd
)
4514 return sd
->rps_ipi_list
!= NULL
;
4520 static int process_backlog(struct napi_struct
*napi
, int quota
)
4523 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4525 /* Check if we have pending ipi, its better to send them now,
4526 * not waiting net_rx_action() end.
4528 if (sd_has_rps_ipi_waiting(sd
)) {
4529 local_irq_disable();
4530 net_rps_action_and_irq_enable(sd
);
4533 napi
->weight
= weight_p
;
4534 local_irq_disable();
4536 struct sk_buff
*skb
;
4538 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4541 __netif_receive_skb(skb
);
4543 local_irq_disable();
4544 input_queue_head_incr(sd
);
4545 if (++work
>= quota
) {
4552 if (skb_queue_empty(&sd
->input_pkt_queue
)) {
4554 * Inline a custom version of __napi_complete().
4555 * only current cpu owns and manipulates this napi,
4556 * and NAPI_STATE_SCHED is the only possible flag set
4558 * We can use a plain write instead of clear_bit(),
4559 * and we dont need an smp_mb() memory barrier.
4567 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4568 &sd
->process_queue
);
4577 * __napi_schedule - schedule for receive
4578 * @n: entry to schedule
4580 * The entry's receive function will be scheduled to run.
4581 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4583 void __napi_schedule(struct napi_struct
*n
)
4585 unsigned long flags
;
4587 local_irq_save(flags
);
4588 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4589 local_irq_restore(flags
);
4591 EXPORT_SYMBOL(__napi_schedule
);
4594 * __napi_schedule_irqoff - schedule for receive
4595 * @n: entry to schedule
4597 * Variant of __napi_schedule() assuming hard irqs are masked
4599 void __napi_schedule_irqoff(struct napi_struct
*n
)
4601 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4603 EXPORT_SYMBOL(__napi_schedule_irqoff
);
4605 void __napi_complete(struct napi_struct
*n
)
4607 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4609 list_del_init(&n
->poll_list
);
4610 smp_mb__before_atomic();
4611 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4613 EXPORT_SYMBOL(__napi_complete
);
4615 void napi_complete_done(struct napi_struct
*n
, int work_done
)
4617 unsigned long flags
;
4620 * don't let napi dequeue from the cpu poll list
4621 * just in case its running on a different cpu
4623 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4627 unsigned long timeout
= 0;
4630 timeout
= n
->dev
->gro_flush_timeout
;
4633 hrtimer_start(&n
->timer
, ns_to_ktime(timeout
),
4634 HRTIMER_MODE_REL_PINNED
);
4636 napi_gro_flush(n
, false);
4638 if (likely(list_empty(&n
->poll_list
))) {
4639 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED
, &n
->state
));
4641 /* If n->poll_list is not empty, we need to mask irqs */
4642 local_irq_save(flags
);
4644 local_irq_restore(flags
);
4647 EXPORT_SYMBOL(napi_complete_done
);
4649 /* must be called under rcu_read_lock(), as we dont take a reference */
4650 struct napi_struct
*napi_by_id(unsigned int napi_id
)
4652 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4653 struct napi_struct
*napi
;
4655 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4656 if (napi
->napi_id
== napi_id
)
4661 EXPORT_SYMBOL_GPL(napi_by_id
);
4663 void napi_hash_add(struct napi_struct
*napi
)
4665 if (!test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
4667 spin_lock(&napi_hash_lock
);
4669 /* 0 is not a valid id, we also skip an id that is taken
4670 * we expect both events to be extremely rare
4673 while (!napi
->napi_id
) {
4674 napi
->napi_id
= ++napi_gen_id
;
4675 if (napi_by_id(napi
->napi_id
))
4679 hlist_add_head_rcu(&napi
->napi_hash_node
,
4680 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
4682 spin_unlock(&napi_hash_lock
);
4685 EXPORT_SYMBOL_GPL(napi_hash_add
);
4687 /* Warning : caller is responsible to make sure rcu grace period
4688 * is respected before freeing memory containing @napi
4690 void napi_hash_del(struct napi_struct
*napi
)
4692 spin_lock(&napi_hash_lock
);
4694 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
))
4695 hlist_del_rcu(&napi
->napi_hash_node
);
4697 spin_unlock(&napi_hash_lock
);
4699 EXPORT_SYMBOL_GPL(napi_hash_del
);
4701 static enum hrtimer_restart
napi_watchdog(struct hrtimer
*timer
)
4703 struct napi_struct
*napi
;
4705 napi
= container_of(timer
, struct napi_struct
, timer
);
4707 napi_schedule(napi
);
4709 return HRTIMER_NORESTART
;
4712 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4713 int (*poll
)(struct napi_struct
*, int), int weight
)
4715 INIT_LIST_HEAD(&napi
->poll_list
);
4716 hrtimer_init(&napi
->timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_REL_PINNED
);
4717 napi
->timer
.function
= napi_watchdog
;
4718 napi
->gro_count
= 0;
4719 napi
->gro_list
= NULL
;
4722 if (weight
> NAPI_POLL_WEIGHT
)
4723 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4725 napi
->weight
= weight
;
4726 list_add(&napi
->dev_list
, &dev
->napi_list
);
4728 #ifdef CONFIG_NETPOLL
4729 spin_lock_init(&napi
->poll_lock
);
4730 napi
->poll_owner
= -1;
4732 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4734 EXPORT_SYMBOL(netif_napi_add
);
4736 void napi_disable(struct napi_struct
*n
)
4739 set_bit(NAPI_STATE_DISABLE
, &n
->state
);
4741 while (test_and_set_bit(NAPI_STATE_SCHED
, &n
->state
))
4743 while (test_and_set_bit(NAPI_STATE_NPSVC
, &n
->state
))
4746 hrtimer_cancel(&n
->timer
);
4748 clear_bit(NAPI_STATE_DISABLE
, &n
->state
);
4750 EXPORT_SYMBOL(napi_disable
);
4752 void netif_napi_del(struct napi_struct
*napi
)
4754 list_del_init(&napi
->dev_list
);
4755 napi_free_frags(napi
);
4757 kfree_skb_list(napi
->gro_list
);
4758 napi
->gro_list
= NULL
;
4759 napi
->gro_count
= 0;
4761 EXPORT_SYMBOL(netif_napi_del
);
4763 static int napi_poll(struct napi_struct
*n
, struct list_head
*repoll
)
4768 list_del_init(&n
->poll_list
);
4770 have
= netpoll_poll_lock(n
);
4774 /* This NAPI_STATE_SCHED test is for avoiding a race
4775 * with netpoll's poll_napi(). Only the entity which
4776 * obtains the lock and sees NAPI_STATE_SCHED set will
4777 * actually make the ->poll() call. Therefore we avoid
4778 * accidentally calling ->poll() when NAPI is not scheduled.
4781 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4782 work
= n
->poll(n
, weight
);
4786 WARN_ON_ONCE(work
> weight
);
4788 if (likely(work
< weight
))
4791 /* Drivers must not modify the NAPI state if they
4792 * consume the entire weight. In such cases this code
4793 * still "owns" the NAPI instance and therefore can
4794 * move the instance around on the list at-will.
4796 if (unlikely(napi_disable_pending(n
))) {
4802 /* flush too old packets
4803 * If HZ < 1000, flush all packets.
4805 napi_gro_flush(n
, HZ
>= 1000);
4808 /* Some drivers may have called napi_schedule
4809 * prior to exhausting their budget.
4811 if (unlikely(!list_empty(&n
->poll_list
))) {
4812 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
4813 n
->dev
? n
->dev
->name
: "backlog");
4817 list_add_tail(&n
->poll_list
, repoll
);
4820 netpoll_poll_unlock(have
);
4825 static void net_rx_action(struct softirq_action
*h
)
4827 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4828 unsigned long time_limit
= jiffies
+ 2;
4829 int budget
= netdev_budget
;
4833 local_irq_disable();
4834 list_splice_init(&sd
->poll_list
, &list
);
4838 struct napi_struct
*n
;
4840 if (list_empty(&list
)) {
4841 if (!sd_has_rps_ipi_waiting(sd
) && list_empty(&repoll
))
4846 n
= list_first_entry(&list
, struct napi_struct
, poll_list
);
4847 budget
-= napi_poll(n
, &repoll
);
4849 /* If softirq window is exhausted then punt.
4850 * Allow this to run for 2 jiffies since which will allow
4851 * an average latency of 1.5/HZ.
4853 if (unlikely(budget
<= 0 ||
4854 time_after_eq(jiffies
, time_limit
))) {
4860 local_irq_disable();
4862 list_splice_tail_init(&sd
->poll_list
, &list
);
4863 list_splice_tail(&repoll
, &list
);
4864 list_splice(&list
, &sd
->poll_list
);
4865 if (!list_empty(&sd
->poll_list
))
4866 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4868 net_rps_action_and_irq_enable(sd
);
4871 struct netdev_adjacent
{
4872 struct net_device
*dev
;
4874 /* upper master flag, there can only be one master device per list */
4877 /* counter for the number of times this device was added to us */
4880 /* private field for the users */
4883 struct list_head list
;
4884 struct rcu_head rcu
;
4887 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*dev
,
4888 struct net_device
*adj_dev
,
4889 struct list_head
*adj_list
)
4891 struct netdev_adjacent
*adj
;
4893 list_for_each_entry(adj
, adj_list
, list
) {
4894 if (adj
->dev
== adj_dev
)
4901 * netdev_has_upper_dev - Check if device is linked to an upper device
4903 * @upper_dev: upper device to check
4905 * Find out if a device is linked to specified upper device and return true
4906 * in case it is. Note that this checks only immediate upper device,
4907 * not through a complete stack of devices. The caller must hold the RTNL lock.
4909 bool netdev_has_upper_dev(struct net_device
*dev
,
4910 struct net_device
*upper_dev
)
4914 return __netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
);
4916 EXPORT_SYMBOL(netdev_has_upper_dev
);
4919 * netdev_has_any_upper_dev - Check if device is linked to some device
4922 * Find out if a device is linked to an upper device and return true in case
4923 * it is. The caller must hold the RTNL lock.
4925 static bool netdev_has_any_upper_dev(struct net_device
*dev
)
4929 return !list_empty(&dev
->all_adj_list
.upper
);
4933 * netdev_master_upper_dev_get - Get master upper device
4936 * Find a master upper device and return pointer to it or NULL in case
4937 * it's not there. The caller must hold the RTNL lock.
4939 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4941 struct netdev_adjacent
*upper
;
4945 if (list_empty(&dev
->adj_list
.upper
))
4948 upper
= list_first_entry(&dev
->adj_list
.upper
,
4949 struct netdev_adjacent
, list
);
4950 if (likely(upper
->master
))
4954 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4956 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
4958 struct netdev_adjacent
*adj
;
4960 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
4962 return adj
->private;
4964 EXPORT_SYMBOL(netdev_adjacent_get_private
);
4967 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
4969 * @iter: list_head ** of the current position
4971 * Gets the next device from the dev's upper list, starting from iter
4972 * position. The caller must hold RCU read lock.
4974 struct net_device
*netdev_upper_get_next_dev_rcu(struct net_device
*dev
,
4975 struct list_head
**iter
)
4977 struct netdev_adjacent
*upper
;
4979 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4981 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4983 if (&upper
->list
== &dev
->adj_list
.upper
)
4986 *iter
= &upper
->list
;
4990 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu
);
4993 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4995 * @iter: list_head ** of the current position
4997 * Gets the next device from the dev's upper list, starting from iter
4998 * position. The caller must hold RCU read lock.
5000 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
5001 struct list_head
**iter
)
5003 struct netdev_adjacent
*upper
;
5005 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5007 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5009 if (&upper
->list
== &dev
->all_adj_list
.upper
)
5012 *iter
= &upper
->list
;
5016 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
5019 * netdev_lower_get_next_private - Get the next ->private from the
5020 * lower neighbour list
5022 * @iter: list_head ** of the current position
5024 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5025 * list, starting from iter position. The caller must hold either hold the
5026 * RTNL lock or its own locking that guarantees that the neighbour lower
5027 * list will remain unchanged.
5029 void *netdev_lower_get_next_private(struct net_device
*dev
,
5030 struct list_head
**iter
)
5032 struct netdev_adjacent
*lower
;
5034 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
5036 if (&lower
->list
== &dev
->adj_list
.lower
)
5039 *iter
= lower
->list
.next
;
5041 return lower
->private;
5043 EXPORT_SYMBOL(netdev_lower_get_next_private
);
5046 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5047 * lower neighbour list, RCU
5050 * @iter: list_head ** of the current position
5052 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5053 * list, starting from iter position. The caller must hold RCU read lock.
5055 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
5056 struct list_head
**iter
)
5058 struct netdev_adjacent
*lower
;
5060 WARN_ON_ONCE(!rcu_read_lock_held());
5062 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5064 if (&lower
->list
== &dev
->adj_list
.lower
)
5067 *iter
= &lower
->list
;
5069 return lower
->private;
5071 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
5074 * netdev_lower_get_next - Get the next device from the lower neighbour
5077 * @iter: list_head ** of the current position
5079 * Gets the next netdev_adjacent from the dev's lower neighbour
5080 * list, starting from iter position. The caller must hold RTNL lock or
5081 * its own locking that guarantees that the neighbour lower
5082 * list will remain unchanged.
5084 void *netdev_lower_get_next(struct net_device
*dev
, struct list_head
**iter
)
5086 struct netdev_adjacent
*lower
;
5088 lower
= list_entry((*iter
)->next
, struct netdev_adjacent
, list
);
5090 if (&lower
->list
== &dev
->adj_list
.lower
)
5093 *iter
= &lower
->list
;
5097 EXPORT_SYMBOL(netdev_lower_get_next
);
5100 * netdev_lower_get_first_private_rcu - Get the first ->private from the
5101 * lower neighbour list, RCU
5105 * Gets the first netdev_adjacent->private from the dev's lower neighbour
5106 * list. The caller must hold RCU read lock.
5108 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
5110 struct netdev_adjacent
*lower
;
5112 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
5113 struct netdev_adjacent
, list
);
5115 return lower
->private;
5118 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
5121 * netdev_master_upper_dev_get_rcu - Get master upper device
5124 * Find a master upper device and return pointer to it or NULL in case
5125 * it's not there. The caller must hold the RCU read lock.
5127 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
5129 struct netdev_adjacent
*upper
;
5131 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
5132 struct netdev_adjacent
, list
);
5133 if (upper
&& likely(upper
->master
))
5137 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
5139 static int netdev_adjacent_sysfs_add(struct net_device
*dev
,
5140 struct net_device
*adj_dev
,
5141 struct list_head
*dev_list
)
5143 char linkname
[IFNAMSIZ
+7];
5144 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
5145 "upper_%s" : "lower_%s", adj_dev
->name
);
5146 return sysfs_create_link(&(dev
->dev
.kobj
), &(adj_dev
->dev
.kobj
),
5149 static void netdev_adjacent_sysfs_del(struct net_device
*dev
,
5151 struct list_head
*dev_list
)
5153 char linkname
[IFNAMSIZ
+7];
5154 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
5155 "upper_%s" : "lower_%s", name
);
5156 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
5159 static inline bool netdev_adjacent_is_neigh_list(struct net_device
*dev
,
5160 struct net_device
*adj_dev
,
5161 struct list_head
*dev_list
)
5163 return (dev_list
== &dev
->adj_list
.upper
||
5164 dev_list
== &dev
->adj_list
.lower
) &&
5165 net_eq(dev_net(dev
), dev_net(adj_dev
));
5168 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
5169 struct net_device
*adj_dev
,
5170 struct list_head
*dev_list
,
5171 void *private, bool master
)
5173 struct netdev_adjacent
*adj
;
5176 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
5183 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
5188 adj
->master
= master
;
5190 adj
->private = private;
5193 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5194 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5196 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
)) {
5197 ret
= netdev_adjacent_sysfs_add(dev
, adj_dev
, dev_list
);
5202 /* Ensure that master link is always the first item in list. */
5204 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
5205 &(adj_dev
->dev
.kobj
), "master");
5207 goto remove_symlinks
;
5209 list_add_rcu(&adj
->list
, dev_list
);
5211 list_add_tail_rcu(&adj
->list
, dev_list
);
5217 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5218 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5226 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
5227 struct net_device
*adj_dev
,
5228 struct list_head
*dev_list
)
5230 struct netdev_adjacent
*adj
;
5232 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
5235 pr_err("tried to remove device %s from %s\n",
5236 dev
->name
, adj_dev
->name
);
5240 if (adj
->ref_nr
> 1) {
5241 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
5248 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
5250 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5251 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5253 list_del_rcu(&adj
->list
);
5254 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5255 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5257 kfree_rcu(adj
, rcu
);
5260 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
5261 struct net_device
*upper_dev
,
5262 struct list_head
*up_list
,
5263 struct list_head
*down_list
,
5264 void *private, bool master
)
5268 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
5273 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
5276 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5283 static int __netdev_adjacent_dev_link(struct net_device
*dev
,
5284 struct net_device
*upper_dev
)
5286 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5287 &dev
->all_adj_list
.upper
,
5288 &upper_dev
->all_adj_list
.lower
,
5292 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
5293 struct net_device
*upper_dev
,
5294 struct list_head
*up_list
,
5295 struct list_head
*down_list
)
5297 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5298 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
5301 static void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
5302 struct net_device
*upper_dev
)
5304 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5305 &dev
->all_adj_list
.upper
,
5306 &upper_dev
->all_adj_list
.lower
);
5309 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
5310 struct net_device
*upper_dev
,
5311 void *private, bool master
)
5313 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
5318 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5319 &dev
->adj_list
.upper
,
5320 &upper_dev
->adj_list
.lower
,
5323 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5330 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
5331 struct net_device
*upper_dev
)
5333 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5334 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5335 &dev
->adj_list
.upper
,
5336 &upper_dev
->adj_list
.lower
);
5339 static int __netdev_upper_dev_link(struct net_device
*dev
,
5340 struct net_device
*upper_dev
, bool master
,
5343 struct netdev_notifier_changeupper_info changeupper_info
;
5344 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
5349 if (dev
== upper_dev
)
5352 /* To prevent loops, check if dev is not upper device to upper_dev. */
5353 if (__netdev_find_adj(upper_dev
, dev
, &upper_dev
->all_adj_list
.upper
))
5356 if (__netdev_find_adj(dev
, upper_dev
, &dev
->adj_list
.upper
))
5359 if (master
&& netdev_master_upper_dev_get(dev
))
5362 changeupper_info
.upper_dev
= upper_dev
;
5363 changeupper_info
.master
= master
;
5364 changeupper_info
.linking
= true;
5366 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, private,
5371 /* Now that we linked these devs, make all the upper_dev's
5372 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5373 * versa, and don't forget the devices itself. All of these
5374 * links are non-neighbours.
5376 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5377 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5378 pr_debug("Interlinking %s with %s, non-neighbour\n",
5379 i
->dev
->name
, j
->dev
->name
);
5380 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
5386 /* add dev to every upper_dev's upper device */
5387 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5388 pr_debug("linking %s's upper device %s with %s\n",
5389 upper_dev
->name
, i
->dev
->name
, dev
->name
);
5390 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
5392 goto rollback_upper_mesh
;
5395 /* add upper_dev to every dev's lower device */
5396 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5397 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
5398 i
->dev
->name
, upper_dev
->name
);
5399 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
5401 goto rollback_lower_mesh
;
5404 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
, dev
,
5405 &changeupper_info
.info
);
5408 rollback_lower_mesh
:
5410 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5413 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5418 rollback_upper_mesh
:
5420 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5423 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5431 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5432 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5433 if (i
== to_i
&& j
== to_j
)
5435 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5441 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5447 * netdev_upper_dev_link - Add a link to the upper device
5449 * @upper_dev: new upper device
5451 * Adds a link to device which is upper to this one. The caller must hold
5452 * the RTNL lock. On a failure a negative errno code is returned.
5453 * On success the reference counts are adjusted and the function
5456 int netdev_upper_dev_link(struct net_device
*dev
,
5457 struct net_device
*upper_dev
)
5459 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
);
5461 EXPORT_SYMBOL(netdev_upper_dev_link
);
5464 * netdev_master_upper_dev_link - Add a master link to the upper device
5466 * @upper_dev: new upper device
5468 * Adds a link to device which is upper to this one. In this case, only
5469 * one master upper device can be linked, although other non-master devices
5470 * might be linked as well. The caller must hold the RTNL lock.
5471 * On a failure a negative errno code is returned. On success the reference
5472 * counts are adjusted and the function returns zero.
5474 int netdev_master_upper_dev_link(struct net_device
*dev
,
5475 struct net_device
*upper_dev
)
5477 return __netdev_upper_dev_link(dev
, upper_dev
, true, NULL
);
5479 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
5481 int netdev_master_upper_dev_link_private(struct net_device
*dev
,
5482 struct net_device
*upper_dev
,
5485 return __netdev_upper_dev_link(dev
, upper_dev
, true, private);
5487 EXPORT_SYMBOL(netdev_master_upper_dev_link_private
);
5490 * netdev_upper_dev_unlink - Removes a link to upper device
5492 * @upper_dev: new upper device
5494 * Removes a link to device which is upper to this one. The caller must hold
5497 void netdev_upper_dev_unlink(struct net_device
*dev
,
5498 struct net_device
*upper_dev
)
5500 struct netdev_notifier_changeupper_info changeupper_info
;
5501 struct netdev_adjacent
*i
, *j
;
5504 changeupper_info
.upper_dev
= upper_dev
;
5505 changeupper_info
.master
= netdev_master_upper_dev_get(dev
) == upper_dev
;
5506 changeupper_info
.linking
= false;
5508 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5510 /* Here is the tricky part. We must remove all dev's lower
5511 * devices from all upper_dev's upper devices and vice
5512 * versa, to maintain the graph relationship.
5514 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5515 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
5516 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5518 /* remove also the devices itself from lower/upper device
5521 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5522 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5524 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
5525 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5527 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
, dev
,
5528 &changeupper_info
.info
);
5530 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
5533 * netdev_bonding_info_change - Dispatch event about slave change
5535 * @bonding_info: info to dispatch
5537 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5538 * The caller must hold the RTNL lock.
5540 void netdev_bonding_info_change(struct net_device
*dev
,
5541 struct netdev_bonding_info
*bonding_info
)
5543 struct netdev_notifier_bonding_info info
;
5545 memcpy(&info
.bonding_info
, bonding_info
,
5546 sizeof(struct netdev_bonding_info
));
5547 call_netdevice_notifiers_info(NETDEV_BONDING_INFO
, dev
,
5550 EXPORT_SYMBOL(netdev_bonding_info_change
);
5552 static void netdev_adjacent_add_links(struct net_device
*dev
)
5554 struct netdev_adjacent
*iter
;
5556 struct net
*net
= dev_net(dev
);
5558 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5559 if (!net_eq(net
,dev_net(iter
->dev
)))
5561 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5562 &iter
->dev
->adj_list
.lower
);
5563 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5564 &dev
->adj_list
.upper
);
5567 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5568 if (!net_eq(net
,dev_net(iter
->dev
)))
5570 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5571 &iter
->dev
->adj_list
.upper
);
5572 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5573 &dev
->adj_list
.lower
);
5577 static void netdev_adjacent_del_links(struct net_device
*dev
)
5579 struct netdev_adjacent
*iter
;
5581 struct net
*net
= dev_net(dev
);
5583 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5584 if (!net_eq(net
,dev_net(iter
->dev
)))
5586 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5587 &iter
->dev
->adj_list
.lower
);
5588 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5589 &dev
->adj_list
.upper
);
5592 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5593 if (!net_eq(net
,dev_net(iter
->dev
)))
5595 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5596 &iter
->dev
->adj_list
.upper
);
5597 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5598 &dev
->adj_list
.lower
);
5602 void netdev_adjacent_rename_links(struct net_device
*dev
, char *oldname
)
5604 struct netdev_adjacent
*iter
;
5606 struct net
*net
= dev_net(dev
);
5608 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5609 if (!net_eq(net
,dev_net(iter
->dev
)))
5611 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5612 &iter
->dev
->adj_list
.lower
);
5613 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5614 &iter
->dev
->adj_list
.lower
);
5617 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5618 if (!net_eq(net
,dev_net(iter
->dev
)))
5620 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5621 &iter
->dev
->adj_list
.upper
);
5622 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5623 &iter
->dev
->adj_list
.upper
);
5627 void *netdev_lower_dev_get_private(struct net_device
*dev
,
5628 struct net_device
*lower_dev
)
5630 struct netdev_adjacent
*lower
;
5634 lower
= __netdev_find_adj(dev
, lower_dev
, &dev
->adj_list
.lower
);
5638 return lower
->private;
5640 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
5643 int dev_get_nest_level(struct net_device
*dev
,
5644 bool (*type_check
)(struct net_device
*dev
))
5646 struct net_device
*lower
= NULL
;
5647 struct list_head
*iter
;
5653 netdev_for_each_lower_dev(dev
, lower
, iter
) {
5654 nest
= dev_get_nest_level(lower
, type_check
);
5655 if (max_nest
< nest
)
5659 if (type_check(dev
))
5664 EXPORT_SYMBOL(dev_get_nest_level
);
5666 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
5668 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5670 if (ops
->ndo_change_rx_flags
)
5671 ops
->ndo_change_rx_flags(dev
, flags
);
5674 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
5676 unsigned int old_flags
= dev
->flags
;
5682 dev
->flags
|= IFF_PROMISC
;
5683 dev
->promiscuity
+= inc
;
5684 if (dev
->promiscuity
== 0) {
5687 * If inc causes overflow, untouch promisc and return error.
5690 dev
->flags
&= ~IFF_PROMISC
;
5692 dev
->promiscuity
-= inc
;
5693 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5698 if (dev
->flags
!= old_flags
) {
5699 pr_info("device %s %s promiscuous mode\n",
5701 dev
->flags
& IFF_PROMISC
? "entered" : "left");
5702 if (audit_enabled
) {
5703 current_uid_gid(&uid
, &gid
);
5704 audit_log(current
->audit_context
, GFP_ATOMIC
,
5705 AUDIT_ANOM_PROMISCUOUS
,
5706 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5707 dev
->name
, (dev
->flags
& IFF_PROMISC
),
5708 (old_flags
& IFF_PROMISC
),
5709 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
5710 from_kuid(&init_user_ns
, uid
),
5711 from_kgid(&init_user_ns
, gid
),
5712 audit_get_sessionid(current
));
5715 dev_change_rx_flags(dev
, IFF_PROMISC
);
5718 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
5723 * dev_set_promiscuity - update promiscuity count on a device
5727 * Add or remove promiscuity from a device. While the count in the device
5728 * remains above zero the interface remains promiscuous. Once it hits zero
5729 * the device reverts back to normal filtering operation. A negative inc
5730 * value is used to drop promiscuity on the device.
5731 * Return 0 if successful or a negative errno code on error.
5733 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
5735 unsigned int old_flags
= dev
->flags
;
5738 err
= __dev_set_promiscuity(dev
, inc
, true);
5741 if (dev
->flags
!= old_flags
)
5742 dev_set_rx_mode(dev
);
5745 EXPORT_SYMBOL(dev_set_promiscuity
);
5747 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
5749 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5753 dev
->flags
|= IFF_ALLMULTI
;
5754 dev
->allmulti
+= inc
;
5755 if (dev
->allmulti
== 0) {
5758 * If inc causes overflow, untouch allmulti and return error.
5761 dev
->flags
&= ~IFF_ALLMULTI
;
5763 dev
->allmulti
-= inc
;
5764 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5769 if (dev
->flags
^ old_flags
) {
5770 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
5771 dev_set_rx_mode(dev
);
5773 __dev_notify_flags(dev
, old_flags
,
5774 dev
->gflags
^ old_gflags
);
5780 * dev_set_allmulti - update allmulti count on a device
5784 * Add or remove reception of all multicast frames to a device. While the
5785 * count in the device remains above zero the interface remains listening
5786 * to all interfaces. Once it hits zero the device reverts back to normal
5787 * filtering operation. A negative @inc value is used to drop the counter
5788 * when releasing a resource needing all multicasts.
5789 * Return 0 if successful or a negative errno code on error.
5792 int dev_set_allmulti(struct net_device
*dev
, int inc
)
5794 return __dev_set_allmulti(dev
, inc
, true);
5796 EXPORT_SYMBOL(dev_set_allmulti
);
5799 * Upload unicast and multicast address lists to device and
5800 * configure RX filtering. When the device doesn't support unicast
5801 * filtering it is put in promiscuous mode while unicast addresses
5804 void __dev_set_rx_mode(struct net_device
*dev
)
5806 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5808 /* dev_open will call this function so the list will stay sane. */
5809 if (!(dev
->flags
&IFF_UP
))
5812 if (!netif_device_present(dev
))
5815 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
5816 /* Unicast addresses changes may only happen under the rtnl,
5817 * therefore calling __dev_set_promiscuity here is safe.
5819 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
5820 __dev_set_promiscuity(dev
, 1, false);
5821 dev
->uc_promisc
= true;
5822 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
5823 __dev_set_promiscuity(dev
, -1, false);
5824 dev
->uc_promisc
= false;
5828 if (ops
->ndo_set_rx_mode
)
5829 ops
->ndo_set_rx_mode(dev
);
5832 void dev_set_rx_mode(struct net_device
*dev
)
5834 netif_addr_lock_bh(dev
);
5835 __dev_set_rx_mode(dev
);
5836 netif_addr_unlock_bh(dev
);
5840 * dev_get_flags - get flags reported to userspace
5843 * Get the combination of flag bits exported through APIs to userspace.
5845 unsigned int dev_get_flags(const struct net_device
*dev
)
5849 flags
= (dev
->flags
& ~(IFF_PROMISC
|
5854 (dev
->gflags
& (IFF_PROMISC
|
5857 if (netif_running(dev
)) {
5858 if (netif_oper_up(dev
))
5859 flags
|= IFF_RUNNING
;
5860 if (netif_carrier_ok(dev
))
5861 flags
|= IFF_LOWER_UP
;
5862 if (netif_dormant(dev
))
5863 flags
|= IFF_DORMANT
;
5868 EXPORT_SYMBOL(dev_get_flags
);
5870 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5872 unsigned int old_flags
= dev
->flags
;
5878 * Set the flags on our device.
5881 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
5882 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
5884 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
5888 * Load in the correct multicast list now the flags have changed.
5891 if ((old_flags
^ flags
) & IFF_MULTICAST
)
5892 dev_change_rx_flags(dev
, IFF_MULTICAST
);
5894 dev_set_rx_mode(dev
);
5897 * Have we downed the interface. We handle IFF_UP ourselves
5898 * according to user attempts to set it, rather than blindly
5903 if ((old_flags
^ flags
) & IFF_UP
)
5904 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
5906 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
5907 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
5908 unsigned int old_flags
= dev
->flags
;
5910 dev
->gflags
^= IFF_PROMISC
;
5912 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
5913 if (dev
->flags
!= old_flags
)
5914 dev_set_rx_mode(dev
);
5917 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5918 is important. Some (broken) drivers set IFF_PROMISC, when
5919 IFF_ALLMULTI is requested not asking us and not reporting.
5921 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
5922 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
5924 dev
->gflags
^= IFF_ALLMULTI
;
5925 __dev_set_allmulti(dev
, inc
, false);
5931 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
5932 unsigned int gchanges
)
5934 unsigned int changes
= dev
->flags
^ old_flags
;
5937 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
5939 if (changes
& IFF_UP
) {
5940 if (dev
->flags
& IFF_UP
)
5941 call_netdevice_notifiers(NETDEV_UP
, dev
);
5943 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
5946 if (dev
->flags
& IFF_UP
&&
5947 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
5948 struct netdev_notifier_change_info change_info
;
5950 change_info
.flags_changed
= changes
;
5951 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
5957 * dev_change_flags - change device settings
5959 * @flags: device state flags
5961 * Change settings on device based state flags. The flags are
5962 * in the userspace exported format.
5964 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5967 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5969 ret
= __dev_change_flags(dev
, flags
);
5973 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
5974 __dev_notify_flags(dev
, old_flags
, changes
);
5977 EXPORT_SYMBOL(dev_change_flags
);
5979 static int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5981 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5983 if (ops
->ndo_change_mtu
)
5984 return ops
->ndo_change_mtu(dev
, new_mtu
);
5991 * dev_set_mtu - Change maximum transfer unit
5993 * @new_mtu: new transfer unit
5995 * Change the maximum transfer size of the network device.
5997 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
6001 if (new_mtu
== dev
->mtu
)
6004 /* MTU must be positive. */
6008 if (!netif_device_present(dev
))
6011 err
= call_netdevice_notifiers(NETDEV_PRECHANGEMTU
, dev
);
6012 err
= notifier_to_errno(err
);
6016 orig_mtu
= dev
->mtu
;
6017 err
= __dev_set_mtu(dev
, new_mtu
);
6020 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6021 err
= notifier_to_errno(err
);
6023 /* setting mtu back and notifying everyone again,
6024 * so that they have a chance to revert changes.
6026 __dev_set_mtu(dev
, orig_mtu
);
6027 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6032 EXPORT_SYMBOL(dev_set_mtu
);
6035 * dev_set_group - Change group this device belongs to
6037 * @new_group: group this device should belong to
6039 void dev_set_group(struct net_device
*dev
, int new_group
)
6041 dev
->group
= new_group
;
6043 EXPORT_SYMBOL(dev_set_group
);
6046 * dev_set_mac_address - Change Media Access Control Address
6050 * Change the hardware (MAC) address of the device
6052 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
6054 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6057 if (!ops
->ndo_set_mac_address
)
6059 if (sa
->sa_family
!= dev
->type
)
6061 if (!netif_device_present(dev
))
6063 err
= ops
->ndo_set_mac_address(dev
, sa
);
6066 dev
->addr_assign_type
= NET_ADDR_SET
;
6067 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
6068 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6071 EXPORT_SYMBOL(dev_set_mac_address
);
6074 * dev_change_carrier - Change device carrier
6076 * @new_carrier: new value
6078 * Change device carrier
6080 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
6082 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6084 if (!ops
->ndo_change_carrier
)
6086 if (!netif_device_present(dev
))
6088 return ops
->ndo_change_carrier(dev
, new_carrier
);
6090 EXPORT_SYMBOL(dev_change_carrier
);
6093 * dev_get_phys_port_id - Get device physical port ID
6097 * Get device physical port ID
6099 int dev_get_phys_port_id(struct net_device
*dev
,
6100 struct netdev_phys_item_id
*ppid
)
6102 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6104 if (!ops
->ndo_get_phys_port_id
)
6106 return ops
->ndo_get_phys_port_id(dev
, ppid
);
6108 EXPORT_SYMBOL(dev_get_phys_port_id
);
6111 * dev_get_phys_port_name - Get device physical port name
6115 * Get device physical port name
6117 int dev_get_phys_port_name(struct net_device
*dev
,
6118 char *name
, size_t len
)
6120 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6122 if (!ops
->ndo_get_phys_port_name
)
6124 return ops
->ndo_get_phys_port_name(dev
, name
, len
);
6126 EXPORT_SYMBOL(dev_get_phys_port_name
);
6129 * dev_change_proto_down - update protocol port state information
6131 * @proto_down: new value
6133 * This info can be used by switch drivers to set the phys state of the
6136 int dev_change_proto_down(struct net_device
*dev
, bool proto_down
)
6138 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6140 if (!ops
->ndo_change_proto_down
)
6142 if (!netif_device_present(dev
))
6144 return ops
->ndo_change_proto_down(dev
, proto_down
);
6146 EXPORT_SYMBOL(dev_change_proto_down
);
6149 * dev_new_index - allocate an ifindex
6150 * @net: the applicable net namespace
6152 * Returns a suitable unique value for a new device interface
6153 * number. The caller must hold the rtnl semaphore or the
6154 * dev_base_lock to be sure it remains unique.
6156 static int dev_new_index(struct net
*net
)
6158 int ifindex
= net
->ifindex
;
6162 if (!__dev_get_by_index(net
, ifindex
))
6163 return net
->ifindex
= ifindex
;
6167 /* Delayed registration/unregisteration */
6168 static LIST_HEAD(net_todo_list
);
6169 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
6171 static void net_set_todo(struct net_device
*dev
)
6173 list_add_tail(&dev
->todo_list
, &net_todo_list
);
6174 dev_net(dev
)->dev_unreg_count
++;
6177 static void rollback_registered_many(struct list_head
*head
)
6179 struct net_device
*dev
, *tmp
;
6180 LIST_HEAD(close_head
);
6182 BUG_ON(dev_boot_phase
);
6185 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
6186 /* Some devices call without registering
6187 * for initialization unwind. Remove those
6188 * devices and proceed with the remaining.
6190 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6191 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6195 list_del(&dev
->unreg_list
);
6198 dev
->dismantle
= true;
6199 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
6202 /* If device is running, close it first. */
6203 list_for_each_entry(dev
, head
, unreg_list
)
6204 list_add_tail(&dev
->close_list
, &close_head
);
6205 dev_close_many(&close_head
, true);
6207 list_for_each_entry(dev
, head
, unreg_list
) {
6208 /* And unlink it from device chain. */
6209 unlist_netdevice(dev
);
6211 dev
->reg_state
= NETREG_UNREGISTERING
;
6212 on_each_cpu(flush_backlog
, dev
, 1);
6217 list_for_each_entry(dev
, head
, unreg_list
) {
6218 struct sk_buff
*skb
= NULL
;
6220 /* Shutdown queueing discipline. */
6224 /* Notify protocols, that we are about to destroy
6225 this device. They should clean all the things.
6227 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6229 if (!dev
->rtnl_link_ops
||
6230 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6231 skb
= rtmsg_ifinfo_build_skb(RTM_DELLINK
, dev
, ~0U,
6235 * Flush the unicast and multicast chains
6240 if (dev
->netdev_ops
->ndo_uninit
)
6241 dev
->netdev_ops
->ndo_uninit(dev
);
6244 rtmsg_ifinfo_send(skb
, dev
, GFP_KERNEL
);
6246 /* Notifier chain MUST detach us all upper devices. */
6247 WARN_ON(netdev_has_any_upper_dev(dev
));
6249 /* Remove entries from kobject tree */
6250 netdev_unregister_kobject(dev
);
6252 /* Remove XPS queueing entries */
6253 netif_reset_xps_queues_gt(dev
, 0);
6259 list_for_each_entry(dev
, head
, unreg_list
)
6263 static void rollback_registered(struct net_device
*dev
)
6267 list_add(&dev
->unreg_list
, &single
);
6268 rollback_registered_many(&single
);
6272 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
6273 netdev_features_t features
)
6275 /* Fix illegal checksum combinations */
6276 if ((features
& NETIF_F_HW_CSUM
) &&
6277 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6278 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
6279 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
6282 /* TSO requires that SG is present as well. */
6283 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
6284 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
6285 features
&= ~NETIF_F_ALL_TSO
;
6288 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
6289 !(features
& NETIF_F_IP_CSUM
)) {
6290 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
6291 features
&= ~NETIF_F_TSO
;
6292 features
&= ~NETIF_F_TSO_ECN
;
6295 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
6296 !(features
& NETIF_F_IPV6_CSUM
)) {
6297 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
6298 features
&= ~NETIF_F_TSO6
;
6301 /* TSO ECN requires that TSO is present as well. */
6302 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
6303 features
&= ~NETIF_F_TSO_ECN
;
6305 /* Software GSO depends on SG. */
6306 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
6307 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
6308 features
&= ~NETIF_F_GSO
;
6311 /* UFO needs SG and checksumming */
6312 if (features
& NETIF_F_UFO
) {
6313 /* maybe split UFO into V4 and V6? */
6314 if (!((features
& NETIF_F_GEN_CSUM
) ||
6315 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
6316 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6318 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6319 features
&= ~NETIF_F_UFO
;
6322 if (!(features
& NETIF_F_SG
)) {
6324 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6325 features
&= ~NETIF_F_UFO
;
6329 #ifdef CONFIG_NET_RX_BUSY_POLL
6330 if (dev
->netdev_ops
->ndo_busy_poll
)
6331 features
|= NETIF_F_BUSY_POLL
;
6334 features
&= ~NETIF_F_BUSY_POLL
;
6339 int __netdev_update_features(struct net_device
*dev
)
6341 netdev_features_t features
;
6346 features
= netdev_get_wanted_features(dev
);
6348 if (dev
->netdev_ops
->ndo_fix_features
)
6349 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
6351 /* driver might be less strict about feature dependencies */
6352 features
= netdev_fix_features(dev
, features
);
6354 if (dev
->features
== features
)
6357 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
6358 &dev
->features
, &features
);
6360 if (dev
->netdev_ops
->ndo_set_features
)
6361 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
6363 if (unlikely(err
< 0)) {
6365 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6366 err
, &features
, &dev
->features
);
6371 dev
->features
= features
;
6377 * netdev_update_features - recalculate device features
6378 * @dev: the device to check
6380 * Recalculate dev->features set and send notifications if it
6381 * has changed. Should be called after driver or hardware dependent
6382 * conditions might have changed that influence the features.
6384 void netdev_update_features(struct net_device
*dev
)
6386 if (__netdev_update_features(dev
))
6387 netdev_features_change(dev
);
6389 EXPORT_SYMBOL(netdev_update_features
);
6392 * netdev_change_features - recalculate device features
6393 * @dev: the device to check
6395 * Recalculate dev->features set and send notifications even
6396 * if they have not changed. Should be called instead of
6397 * netdev_update_features() if also dev->vlan_features might
6398 * have changed to allow the changes to be propagated to stacked
6401 void netdev_change_features(struct net_device
*dev
)
6403 __netdev_update_features(dev
);
6404 netdev_features_change(dev
);
6406 EXPORT_SYMBOL(netdev_change_features
);
6409 * netif_stacked_transfer_operstate - transfer operstate
6410 * @rootdev: the root or lower level device to transfer state from
6411 * @dev: the device to transfer operstate to
6413 * Transfer operational state from root to device. This is normally
6414 * called when a stacking relationship exists between the root
6415 * device and the device(a leaf device).
6417 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
6418 struct net_device
*dev
)
6420 if (rootdev
->operstate
== IF_OPER_DORMANT
)
6421 netif_dormant_on(dev
);
6423 netif_dormant_off(dev
);
6425 if (netif_carrier_ok(rootdev
)) {
6426 if (!netif_carrier_ok(dev
))
6427 netif_carrier_on(dev
);
6429 if (netif_carrier_ok(dev
))
6430 netif_carrier_off(dev
);
6433 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
6436 static int netif_alloc_rx_queues(struct net_device
*dev
)
6438 unsigned int i
, count
= dev
->num_rx_queues
;
6439 struct netdev_rx_queue
*rx
;
6440 size_t sz
= count
* sizeof(*rx
);
6444 rx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6452 for (i
= 0; i
< count
; i
++)
6458 static void netdev_init_one_queue(struct net_device
*dev
,
6459 struct netdev_queue
*queue
, void *_unused
)
6461 /* Initialize queue lock */
6462 spin_lock_init(&queue
->_xmit_lock
);
6463 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
6464 queue
->xmit_lock_owner
= -1;
6465 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
6468 dql_init(&queue
->dql
, HZ
);
6472 static void netif_free_tx_queues(struct net_device
*dev
)
6477 static int netif_alloc_netdev_queues(struct net_device
*dev
)
6479 unsigned int count
= dev
->num_tx_queues
;
6480 struct netdev_queue
*tx
;
6481 size_t sz
= count
* sizeof(*tx
);
6483 if (count
< 1 || count
> 0xffff)
6486 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6494 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
6495 spin_lock_init(&dev
->tx_global_lock
);
6500 void netif_tx_stop_all_queues(struct net_device
*dev
)
6504 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
6505 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
6506 netif_tx_stop_queue(txq
);
6509 EXPORT_SYMBOL(netif_tx_stop_all_queues
);
6512 * register_netdevice - register a network device
6513 * @dev: device to register
6515 * Take a completed network device structure and add it to the kernel
6516 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6517 * chain. 0 is returned on success. A negative errno code is returned
6518 * on a failure to set up the device, or if the name is a duplicate.
6520 * Callers must hold the rtnl semaphore. You may want
6521 * register_netdev() instead of this.
6524 * The locking appears insufficient to guarantee two parallel registers
6525 * will not get the same name.
6528 int register_netdevice(struct net_device
*dev
)
6531 struct net
*net
= dev_net(dev
);
6533 BUG_ON(dev_boot_phase
);
6538 /* When net_device's are persistent, this will be fatal. */
6539 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
6542 spin_lock_init(&dev
->addr_list_lock
);
6543 netdev_set_addr_lockdep_class(dev
);
6545 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
6549 /* Init, if this function is available */
6550 if (dev
->netdev_ops
->ndo_init
) {
6551 ret
= dev
->netdev_ops
->ndo_init(dev
);
6559 if (((dev
->hw_features
| dev
->features
) &
6560 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
6561 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
6562 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
6563 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
6570 dev
->ifindex
= dev_new_index(net
);
6571 else if (__dev_get_by_index(net
, dev
->ifindex
))
6574 /* Transfer changeable features to wanted_features and enable
6575 * software offloads (GSO and GRO).
6577 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
6578 dev
->features
|= NETIF_F_SOFT_FEATURES
;
6579 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
6581 if (!(dev
->flags
& IFF_LOOPBACK
)) {
6582 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
6585 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6587 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
6589 /* Make NETIF_F_SG inheritable to tunnel devices.
6591 dev
->hw_enc_features
|= NETIF_F_SG
;
6593 /* Make NETIF_F_SG inheritable to MPLS.
6595 dev
->mpls_features
|= NETIF_F_SG
;
6597 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
6598 ret
= notifier_to_errno(ret
);
6602 ret
= netdev_register_kobject(dev
);
6605 dev
->reg_state
= NETREG_REGISTERED
;
6607 __netdev_update_features(dev
);
6610 * Default initial state at registry is that the
6611 * device is present.
6614 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6616 linkwatch_init_dev(dev
);
6618 dev_init_scheduler(dev
);
6620 list_netdevice(dev
);
6621 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6623 /* If the device has permanent device address, driver should
6624 * set dev_addr and also addr_assign_type should be set to
6625 * NET_ADDR_PERM (default value).
6627 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
6628 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
6630 /* Notify protocols, that a new device appeared. */
6631 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6632 ret
= notifier_to_errno(ret
);
6634 rollback_registered(dev
);
6635 dev
->reg_state
= NETREG_UNREGISTERED
;
6638 * Prevent userspace races by waiting until the network
6639 * device is fully setup before sending notifications.
6641 if (!dev
->rtnl_link_ops
||
6642 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6643 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6649 if (dev
->netdev_ops
->ndo_uninit
)
6650 dev
->netdev_ops
->ndo_uninit(dev
);
6653 EXPORT_SYMBOL(register_netdevice
);
6656 * init_dummy_netdev - init a dummy network device for NAPI
6657 * @dev: device to init
6659 * This takes a network device structure and initialize the minimum
6660 * amount of fields so it can be used to schedule NAPI polls without
6661 * registering a full blown interface. This is to be used by drivers
6662 * that need to tie several hardware interfaces to a single NAPI
6663 * poll scheduler due to HW limitations.
6665 int init_dummy_netdev(struct net_device
*dev
)
6667 /* Clear everything. Note we don't initialize spinlocks
6668 * are they aren't supposed to be taken by any of the
6669 * NAPI code and this dummy netdev is supposed to be
6670 * only ever used for NAPI polls
6672 memset(dev
, 0, sizeof(struct net_device
));
6674 /* make sure we BUG if trying to hit standard
6675 * register/unregister code path
6677 dev
->reg_state
= NETREG_DUMMY
;
6679 /* NAPI wants this */
6680 INIT_LIST_HEAD(&dev
->napi_list
);
6682 /* a dummy interface is started by default */
6683 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6684 set_bit(__LINK_STATE_START
, &dev
->state
);
6686 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6687 * because users of this 'device' dont need to change
6693 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
6697 * register_netdev - register a network device
6698 * @dev: device to register
6700 * Take a completed network device structure and add it to the kernel
6701 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6702 * chain. 0 is returned on success. A negative errno code is returned
6703 * on a failure to set up the device, or if the name is a duplicate.
6705 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6706 * and expands the device name if you passed a format string to
6709 int register_netdev(struct net_device
*dev
)
6714 err
= register_netdevice(dev
);
6718 EXPORT_SYMBOL(register_netdev
);
6720 int netdev_refcnt_read(const struct net_device
*dev
)
6724 for_each_possible_cpu(i
)
6725 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
6728 EXPORT_SYMBOL(netdev_refcnt_read
);
6731 * netdev_wait_allrefs - wait until all references are gone.
6732 * @dev: target net_device
6734 * This is called when unregistering network devices.
6736 * Any protocol or device that holds a reference should register
6737 * for netdevice notification, and cleanup and put back the
6738 * reference if they receive an UNREGISTER event.
6739 * We can get stuck here if buggy protocols don't correctly
6742 static void netdev_wait_allrefs(struct net_device
*dev
)
6744 unsigned long rebroadcast_time
, warning_time
;
6747 linkwatch_forget_dev(dev
);
6749 rebroadcast_time
= warning_time
= jiffies
;
6750 refcnt
= netdev_refcnt_read(dev
);
6752 while (refcnt
!= 0) {
6753 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
6756 /* Rebroadcast unregister notification */
6757 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6763 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6764 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
6766 /* We must not have linkwatch events
6767 * pending on unregister. If this
6768 * happens, we simply run the queue
6769 * unscheduled, resulting in a noop
6772 linkwatch_run_queue();
6777 rebroadcast_time
= jiffies
;
6782 refcnt
= netdev_refcnt_read(dev
);
6784 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
6785 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6787 warning_time
= jiffies
;
6796 * register_netdevice(x1);
6797 * register_netdevice(x2);
6799 * unregister_netdevice(y1);
6800 * unregister_netdevice(y2);
6806 * We are invoked by rtnl_unlock().
6807 * This allows us to deal with problems:
6808 * 1) We can delete sysfs objects which invoke hotplug
6809 * without deadlocking with linkwatch via keventd.
6810 * 2) Since we run with the RTNL semaphore not held, we can sleep
6811 * safely in order to wait for the netdev refcnt to drop to zero.
6813 * We must not return until all unregister events added during
6814 * the interval the lock was held have been completed.
6816 void netdev_run_todo(void)
6818 struct list_head list
;
6820 /* Snapshot list, allow later requests */
6821 list_replace_init(&net_todo_list
, &list
);
6826 /* Wait for rcu callbacks to finish before next phase */
6827 if (!list_empty(&list
))
6830 while (!list_empty(&list
)) {
6831 struct net_device
*dev
6832 = list_first_entry(&list
, struct net_device
, todo_list
);
6833 list_del(&dev
->todo_list
);
6836 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6839 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
6840 pr_err("network todo '%s' but state %d\n",
6841 dev
->name
, dev
->reg_state
);
6846 dev
->reg_state
= NETREG_UNREGISTERED
;
6848 netdev_wait_allrefs(dev
);
6851 BUG_ON(netdev_refcnt_read(dev
));
6852 BUG_ON(!list_empty(&dev
->ptype_all
));
6853 BUG_ON(!list_empty(&dev
->ptype_specific
));
6854 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
6855 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
6856 WARN_ON(dev
->dn_ptr
);
6858 if (dev
->destructor
)
6859 dev
->destructor(dev
);
6861 /* Report a network device has been unregistered */
6863 dev_net(dev
)->dev_unreg_count
--;
6865 wake_up(&netdev_unregistering_wq
);
6867 /* Free network device */
6868 kobject_put(&dev
->dev
.kobj
);
6872 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6873 * fields in the same order, with only the type differing.
6875 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
6876 const struct net_device_stats
*netdev_stats
)
6878 #if BITS_PER_LONG == 64
6879 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
6880 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
6882 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
6883 const unsigned long *src
= (const unsigned long *)netdev_stats
;
6884 u64
*dst
= (u64
*)stats64
;
6886 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
6887 sizeof(*stats64
) / sizeof(u64
));
6888 for (i
= 0; i
< n
; i
++)
6892 EXPORT_SYMBOL(netdev_stats_to_stats64
);
6895 * dev_get_stats - get network device statistics
6896 * @dev: device to get statistics from
6897 * @storage: place to store stats
6899 * Get network statistics from device. Return @storage.
6900 * The device driver may provide its own method by setting
6901 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6902 * otherwise the internal statistics structure is used.
6904 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
6905 struct rtnl_link_stats64
*storage
)
6907 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6909 if (ops
->ndo_get_stats64
) {
6910 memset(storage
, 0, sizeof(*storage
));
6911 ops
->ndo_get_stats64(dev
, storage
);
6912 } else if (ops
->ndo_get_stats
) {
6913 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
6915 netdev_stats_to_stats64(storage
, &dev
->stats
);
6917 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
6918 storage
->tx_dropped
+= atomic_long_read(&dev
->tx_dropped
);
6921 EXPORT_SYMBOL(dev_get_stats
);
6923 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
6925 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
6927 #ifdef CONFIG_NET_CLS_ACT
6930 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
6933 netdev_init_one_queue(dev
, queue
, NULL
);
6934 RCU_INIT_POINTER(queue
->qdisc
, &noop_qdisc
);
6935 queue
->qdisc_sleeping
= &noop_qdisc
;
6936 rcu_assign_pointer(dev
->ingress_queue
, queue
);
6941 static const struct ethtool_ops default_ethtool_ops
;
6943 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
6944 const struct ethtool_ops
*ops
)
6946 if (dev
->ethtool_ops
== &default_ethtool_ops
)
6947 dev
->ethtool_ops
= ops
;
6949 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
6951 void netdev_freemem(struct net_device
*dev
)
6953 char *addr
= (char *)dev
- dev
->padded
;
6959 * alloc_netdev_mqs - allocate network device
6960 * @sizeof_priv: size of private data to allocate space for
6961 * @name: device name format string
6962 * @name_assign_type: origin of device name
6963 * @setup: callback to initialize device
6964 * @txqs: the number of TX subqueues to allocate
6965 * @rxqs: the number of RX subqueues to allocate
6967 * Allocates a struct net_device with private data area for driver use
6968 * and performs basic initialization. Also allocates subqueue structs
6969 * for each queue on the device.
6971 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
6972 unsigned char name_assign_type
,
6973 void (*setup
)(struct net_device
*),
6974 unsigned int txqs
, unsigned int rxqs
)
6976 struct net_device
*dev
;
6978 struct net_device
*p
;
6980 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
6983 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6989 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6994 alloc_size
= sizeof(struct net_device
);
6996 /* ensure 32-byte alignment of private area */
6997 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
6998 alloc_size
+= sizeof_priv
;
7000 /* ensure 32-byte alignment of whole construct */
7001 alloc_size
+= NETDEV_ALIGN
- 1;
7003 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
7005 p
= vzalloc(alloc_size
);
7009 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
7010 dev
->padded
= (char *)dev
- (char *)p
;
7012 dev
->pcpu_refcnt
= alloc_percpu(int);
7013 if (!dev
->pcpu_refcnt
)
7016 if (dev_addr_init(dev
))
7022 dev_net_set(dev
, &init_net
);
7024 dev
->gso_max_size
= GSO_MAX_SIZE
;
7025 dev
->gso_max_segs
= GSO_MAX_SEGS
;
7026 dev
->gso_min_segs
= 0;
7028 INIT_LIST_HEAD(&dev
->napi_list
);
7029 INIT_LIST_HEAD(&dev
->unreg_list
);
7030 INIT_LIST_HEAD(&dev
->close_list
);
7031 INIT_LIST_HEAD(&dev
->link_watch_list
);
7032 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
7033 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
7034 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
7035 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
7036 INIT_LIST_HEAD(&dev
->ptype_all
);
7037 INIT_LIST_HEAD(&dev
->ptype_specific
);
7038 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
| IFF_XMIT_DST_RELEASE_PERM
;
7041 if (!dev
->tx_queue_len
)
7042 dev
->priv_flags
|= IFF_NO_QUEUE
;
7044 dev
->num_tx_queues
= txqs
;
7045 dev
->real_num_tx_queues
= txqs
;
7046 if (netif_alloc_netdev_queues(dev
))
7050 dev
->num_rx_queues
= rxqs
;
7051 dev
->real_num_rx_queues
= rxqs
;
7052 if (netif_alloc_rx_queues(dev
))
7056 strcpy(dev
->name
, name
);
7057 dev
->name_assign_type
= name_assign_type
;
7058 dev
->group
= INIT_NETDEV_GROUP
;
7059 if (!dev
->ethtool_ops
)
7060 dev
->ethtool_ops
= &default_ethtool_ops
;
7062 nf_hook_ingress_init(dev
);
7071 free_percpu(dev
->pcpu_refcnt
);
7073 netdev_freemem(dev
);
7076 EXPORT_SYMBOL(alloc_netdev_mqs
);
7079 * free_netdev - free network device
7082 * This function does the last stage of destroying an allocated device
7083 * interface. The reference to the device object is released.
7084 * If this is the last reference then it will be freed.
7086 void free_netdev(struct net_device
*dev
)
7088 struct napi_struct
*p
, *n
;
7090 netif_free_tx_queues(dev
);
7095 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
7097 /* Flush device addresses */
7098 dev_addr_flush(dev
);
7100 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
7103 free_percpu(dev
->pcpu_refcnt
);
7104 dev
->pcpu_refcnt
= NULL
;
7106 /* Compatibility with error handling in drivers */
7107 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
7108 netdev_freemem(dev
);
7112 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
7113 dev
->reg_state
= NETREG_RELEASED
;
7115 /* will free via device release */
7116 put_device(&dev
->dev
);
7118 EXPORT_SYMBOL(free_netdev
);
7121 * synchronize_net - Synchronize with packet receive processing
7123 * Wait for packets currently being received to be done.
7124 * Does not block later packets from starting.
7126 void synchronize_net(void)
7129 if (rtnl_is_locked())
7130 synchronize_rcu_expedited();
7134 EXPORT_SYMBOL(synchronize_net
);
7137 * unregister_netdevice_queue - remove device from the kernel
7141 * This function shuts down a device interface and removes it
7142 * from the kernel tables.
7143 * If head not NULL, device is queued to be unregistered later.
7145 * Callers must hold the rtnl semaphore. You may want
7146 * unregister_netdev() instead of this.
7149 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
7154 list_move_tail(&dev
->unreg_list
, head
);
7156 rollback_registered(dev
);
7157 /* Finish processing unregister after unlock */
7161 EXPORT_SYMBOL(unregister_netdevice_queue
);
7164 * unregister_netdevice_many - unregister many devices
7165 * @head: list of devices
7167 * Note: As most callers use a stack allocated list_head,
7168 * we force a list_del() to make sure stack wont be corrupted later.
7170 void unregister_netdevice_many(struct list_head
*head
)
7172 struct net_device
*dev
;
7174 if (!list_empty(head
)) {
7175 rollback_registered_many(head
);
7176 list_for_each_entry(dev
, head
, unreg_list
)
7181 EXPORT_SYMBOL(unregister_netdevice_many
);
7184 * unregister_netdev - remove device from the kernel
7187 * This function shuts down a device interface and removes it
7188 * from the kernel tables.
7190 * This is just a wrapper for unregister_netdevice that takes
7191 * the rtnl semaphore. In general you want to use this and not
7192 * unregister_netdevice.
7194 void unregister_netdev(struct net_device
*dev
)
7197 unregister_netdevice(dev
);
7200 EXPORT_SYMBOL(unregister_netdev
);
7203 * dev_change_net_namespace - move device to different nethost namespace
7205 * @net: network namespace
7206 * @pat: If not NULL name pattern to try if the current device name
7207 * is already taken in the destination network namespace.
7209 * This function shuts down a device interface and moves it
7210 * to a new network namespace. On success 0 is returned, on
7211 * a failure a netagive errno code is returned.
7213 * Callers must hold the rtnl semaphore.
7216 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
7222 /* Don't allow namespace local devices to be moved. */
7224 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7227 /* Ensure the device has been registrered */
7228 if (dev
->reg_state
!= NETREG_REGISTERED
)
7231 /* Get out if there is nothing todo */
7233 if (net_eq(dev_net(dev
), net
))
7236 /* Pick the destination device name, and ensure
7237 * we can use it in the destination network namespace.
7240 if (__dev_get_by_name(net
, dev
->name
)) {
7241 /* We get here if we can't use the current device name */
7244 if (dev_get_valid_name(net
, dev
, pat
) < 0)
7249 * And now a mini version of register_netdevice unregister_netdevice.
7252 /* If device is running close it first. */
7255 /* And unlink it from device chain */
7257 unlist_netdevice(dev
);
7261 /* Shutdown queueing discipline. */
7264 /* Notify protocols, that we are about to destroy
7265 this device. They should clean all the things.
7267 Note that dev->reg_state stays at NETREG_REGISTERED.
7268 This is wanted because this way 8021q and macvlan know
7269 the device is just moving and can keep their slaves up.
7271 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
7273 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7274 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
7277 * Flush the unicast and multicast chains
7282 /* Send a netdev-removed uevent to the old namespace */
7283 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
7284 netdev_adjacent_del_links(dev
);
7286 /* Actually switch the network namespace */
7287 dev_net_set(dev
, net
);
7289 /* If there is an ifindex conflict assign a new one */
7290 if (__dev_get_by_index(net
, dev
->ifindex
))
7291 dev
->ifindex
= dev_new_index(net
);
7293 /* Send a netdev-add uevent to the new namespace */
7294 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
7295 netdev_adjacent_add_links(dev
);
7297 /* Fixup kobjects */
7298 err
= device_rename(&dev
->dev
, dev
->name
);
7301 /* Add the device back in the hashes */
7302 list_netdevice(dev
);
7304 /* Notify protocols, that a new device appeared. */
7305 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
7308 * Prevent userspace races by waiting until the network
7309 * device is fully setup before sending notifications.
7311 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
7318 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
7320 static int dev_cpu_callback(struct notifier_block
*nfb
,
7321 unsigned long action
,
7324 struct sk_buff
**list_skb
;
7325 struct sk_buff
*skb
;
7326 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
7327 struct softnet_data
*sd
, *oldsd
;
7329 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
7332 local_irq_disable();
7333 cpu
= smp_processor_id();
7334 sd
= &per_cpu(softnet_data
, cpu
);
7335 oldsd
= &per_cpu(softnet_data
, oldcpu
);
7337 /* Find end of our completion_queue. */
7338 list_skb
= &sd
->completion_queue
;
7340 list_skb
= &(*list_skb
)->next
;
7341 /* Append completion queue from offline CPU. */
7342 *list_skb
= oldsd
->completion_queue
;
7343 oldsd
->completion_queue
= NULL
;
7345 /* Append output queue from offline CPU. */
7346 if (oldsd
->output_queue
) {
7347 *sd
->output_queue_tailp
= oldsd
->output_queue
;
7348 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
7349 oldsd
->output_queue
= NULL
;
7350 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
7352 /* Append NAPI poll list from offline CPU, with one exception :
7353 * process_backlog() must be called by cpu owning percpu backlog.
7354 * We properly handle process_queue & input_pkt_queue later.
7356 while (!list_empty(&oldsd
->poll_list
)) {
7357 struct napi_struct
*napi
= list_first_entry(&oldsd
->poll_list
,
7361 list_del_init(&napi
->poll_list
);
7362 if (napi
->poll
== process_backlog
)
7365 ____napi_schedule(sd
, napi
);
7368 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
7371 /* Process offline CPU's input_pkt_queue */
7372 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
7374 input_queue_head_incr(oldsd
);
7376 while ((skb
= skb_dequeue(&oldsd
->input_pkt_queue
))) {
7378 input_queue_head_incr(oldsd
);
7386 * netdev_increment_features - increment feature set by one
7387 * @all: current feature set
7388 * @one: new feature set
7389 * @mask: mask feature set
7391 * Computes a new feature set after adding a device with feature set
7392 * @one to the master device with current feature set @all. Will not
7393 * enable anything that is off in @mask. Returns the new feature set.
7395 netdev_features_t
netdev_increment_features(netdev_features_t all
,
7396 netdev_features_t one
, netdev_features_t mask
)
7398 if (mask
& NETIF_F_GEN_CSUM
)
7399 mask
|= NETIF_F_ALL_CSUM
;
7400 mask
|= NETIF_F_VLAN_CHALLENGED
;
7402 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
7403 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
7405 /* If one device supports hw checksumming, set for all. */
7406 if (all
& NETIF_F_GEN_CSUM
)
7407 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
7411 EXPORT_SYMBOL(netdev_increment_features
);
7413 static struct hlist_head
* __net_init
netdev_create_hash(void)
7416 struct hlist_head
*hash
;
7418 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
7420 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
7421 INIT_HLIST_HEAD(&hash
[i
]);
7426 /* Initialize per network namespace state */
7427 static int __net_init
netdev_init(struct net
*net
)
7429 if (net
!= &init_net
)
7430 INIT_LIST_HEAD(&net
->dev_base_head
);
7432 net
->dev_name_head
= netdev_create_hash();
7433 if (net
->dev_name_head
== NULL
)
7436 net
->dev_index_head
= netdev_create_hash();
7437 if (net
->dev_index_head
== NULL
)
7443 kfree(net
->dev_name_head
);
7449 * netdev_drivername - network driver for the device
7450 * @dev: network device
7452 * Determine network driver for device.
7454 const char *netdev_drivername(const struct net_device
*dev
)
7456 const struct device_driver
*driver
;
7457 const struct device
*parent
;
7458 const char *empty
= "";
7460 parent
= dev
->dev
.parent
;
7464 driver
= parent
->driver
;
7465 if (driver
&& driver
->name
)
7466 return driver
->name
;
7470 static void __netdev_printk(const char *level
, const struct net_device
*dev
,
7471 struct va_format
*vaf
)
7473 if (dev
&& dev
->dev
.parent
) {
7474 dev_printk_emit(level
[1] - '0',
7477 dev_driver_string(dev
->dev
.parent
),
7478 dev_name(dev
->dev
.parent
),
7479 netdev_name(dev
), netdev_reg_state(dev
),
7482 printk("%s%s%s: %pV",
7483 level
, netdev_name(dev
), netdev_reg_state(dev
), vaf
);
7485 printk("%s(NULL net_device): %pV", level
, vaf
);
7489 void netdev_printk(const char *level
, const struct net_device
*dev
,
7490 const char *format
, ...)
7492 struct va_format vaf
;
7495 va_start(args
, format
);
7500 __netdev_printk(level
, dev
, &vaf
);
7504 EXPORT_SYMBOL(netdev_printk
);
7506 #define define_netdev_printk_level(func, level) \
7507 void func(const struct net_device *dev, const char *fmt, ...) \
7509 struct va_format vaf; \
7512 va_start(args, fmt); \
7517 __netdev_printk(level, dev, &vaf); \
7521 EXPORT_SYMBOL(func);
7523 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
7524 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
7525 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
7526 define_netdev_printk_level(netdev_err
, KERN_ERR
);
7527 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
7528 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
7529 define_netdev_printk_level(netdev_info
, KERN_INFO
);
7531 static void __net_exit
netdev_exit(struct net
*net
)
7533 kfree(net
->dev_name_head
);
7534 kfree(net
->dev_index_head
);
7537 static struct pernet_operations __net_initdata netdev_net_ops
= {
7538 .init
= netdev_init
,
7539 .exit
= netdev_exit
,
7542 static void __net_exit
default_device_exit(struct net
*net
)
7544 struct net_device
*dev
, *aux
;
7546 * Push all migratable network devices back to the
7547 * initial network namespace
7550 for_each_netdev_safe(net
, dev
, aux
) {
7552 char fb_name
[IFNAMSIZ
];
7554 /* Ignore unmoveable devices (i.e. loopback) */
7555 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7558 /* Leave virtual devices for the generic cleanup */
7559 if (dev
->rtnl_link_ops
)
7562 /* Push remaining network devices to init_net */
7563 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
7564 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
7566 pr_emerg("%s: failed to move %s to init_net: %d\n",
7567 __func__
, dev
->name
, err
);
7574 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
7576 /* Return with the rtnl_lock held when there are no network
7577 * devices unregistering in any network namespace in net_list.
7581 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
7583 add_wait_queue(&netdev_unregistering_wq
, &wait
);
7585 unregistering
= false;
7587 list_for_each_entry(net
, net_list
, exit_list
) {
7588 if (net
->dev_unreg_count
> 0) {
7589 unregistering
= true;
7597 wait_woken(&wait
, TASK_UNINTERRUPTIBLE
, MAX_SCHEDULE_TIMEOUT
);
7599 remove_wait_queue(&netdev_unregistering_wq
, &wait
);
7602 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
7604 /* At exit all network devices most be removed from a network
7605 * namespace. Do this in the reverse order of registration.
7606 * Do this across as many network namespaces as possible to
7607 * improve batching efficiency.
7609 struct net_device
*dev
;
7611 LIST_HEAD(dev_kill_list
);
7613 /* To prevent network device cleanup code from dereferencing
7614 * loopback devices or network devices that have been freed
7615 * wait here for all pending unregistrations to complete,
7616 * before unregistring the loopback device and allowing the
7617 * network namespace be freed.
7619 * The netdev todo list containing all network devices
7620 * unregistrations that happen in default_device_exit_batch
7621 * will run in the rtnl_unlock() at the end of
7622 * default_device_exit_batch.
7624 rtnl_lock_unregistering(net_list
);
7625 list_for_each_entry(net
, net_list
, exit_list
) {
7626 for_each_netdev_reverse(net
, dev
) {
7627 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
)
7628 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
7630 unregister_netdevice_queue(dev
, &dev_kill_list
);
7633 unregister_netdevice_many(&dev_kill_list
);
7637 static struct pernet_operations __net_initdata default_device_ops
= {
7638 .exit
= default_device_exit
,
7639 .exit_batch
= default_device_exit_batch
,
7643 * Initialize the DEV module. At boot time this walks the device list and
7644 * unhooks any devices that fail to initialise (normally hardware not
7645 * present) and leaves us with a valid list of present and active devices.
7650 * This is called single threaded during boot, so no need
7651 * to take the rtnl semaphore.
7653 static int __init
net_dev_init(void)
7655 int i
, rc
= -ENOMEM
;
7657 BUG_ON(!dev_boot_phase
);
7659 if (dev_proc_init())
7662 if (netdev_kobject_init())
7665 INIT_LIST_HEAD(&ptype_all
);
7666 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
7667 INIT_LIST_HEAD(&ptype_base
[i
]);
7669 INIT_LIST_HEAD(&offload_base
);
7671 if (register_pernet_subsys(&netdev_net_ops
))
7675 * Initialise the packet receive queues.
7678 for_each_possible_cpu(i
) {
7679 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
7681 skb_queue_head_init(&sd
->input_pkt_queue
);
7682 skb_queue_head_init(&sd
->process_queue
);
7683 INIT_LIST_HEAD(&sd
->poll_list
);
7684 sd
->output_queue_tailp
= &sd
->output_queue
;
7686 sd
->csd
.func
= rps_trigger_softirq
;
7691 sd
->backlog
.poll
= process_backlog
;
7692 sd
->backlog
.weight
= weight_p
;
7697 /* The loopback device is special if any other network devices
7698 * is present in a network namespace the loopback device must
7699 * be present. Since we now dynamically allocate and free the
7700 * loopback device ensure this invariant is maintained by
7701 * keeping the loopback device as the first device on the
7702 * list of network devices. Ensuring the loopback devices
7703 * is the first device that appears and the last network device
7706 if (register_pernet_device(&loopback_net_ops
))
7709 if (register_pernet_device(&default_device_ops
))
7712 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
7713 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
7715 hotcpu_notifier(dev_cpu_callback
, 0);
7722 subsys_initcall(net_dev_init
);