2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/stat.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <net/xfrm.h>
105 #include <linux/highmem.h>
106 #include <linux/init.h>
107 #include <linux/module.h>
108 #include <linux/netpoll.h>
109 #include <linux/rcupdate.h>
110 #include <linux/delay.h>
111 #include <net/iw_handler.h>
112 #include <asm/current.h>
113 #include <linux/audit.h>
114 #include <linux/dmaengine.h>
115 #include <linux/err.h>
116 #include <linux/ctype.h>
117 #include <linux/if_arp.h>
118 #include <linux/if_vlan.h>
119 #include <linux/ip.h>
121 #include <net/mpls.h>
122 #include <linux/ipv6.h>
123 #include <linux/in.h>
124 #include <linux/jhash.h>
125 #include <linux/random.h>
126 #include <trace/events/napi.h>
127 #include <trace/events/net.h>
128 #include <trace/events/skb.h>
129 #include <linux/pci.h>
130 #include <linux/inetdevice.h>
131 #include <linux/cpu_rmap.h>
132 #include <linux/static_key.h>
133 #include <linux/hashtable.h>
134 #include <linux/vmalloc.h>
135 #include <linux/if_macvlan.h>
136 #include <linux/errqueue.h>
137 #include <linux/hrtimer.h>
138 #include <linux/netfilter_ingress.h>
140 #include "net-sysfs.h"
142 /* Instead of increasing this, you should create a hash table. */
143 #define MAX_GRO_SKBS 8
145 /* This should be increased if a protocol with a bigger head is added. */
146 #define GRO_MAX_HEAD (MAX_HEADER + 128)
148 static DEFINE_SPINLOCK(ptype_lock
);
149 static DEFINE_SPINLOCK(offload_lock
);
150 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
151 struct list_head ptype_all __read_mostly
; /* Taps */
152 static struct list_head offload_base __read_mostly
;
154 static int netif_rx_internal(struct sk_buff
*skb
);
155 static int call_netdevice_notifiers_info(unsigned long val
,
156 struct net_device
*dev
,
157 struct netdev_notifier_info
*info
);
160 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
163 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
165 * Writers must hold the rtnl semaphore while they loop through the
166 * dev_base_head list, and hold dev_base_lock for writing when they do the
167 * actual updates. This allows pure readers to access the list even
168 * while a writer is preparing to update it.
170 * To put it another way, dev_base_lock is held for writing only to
171 * protect against pure readers; the rtnl semaphore provides the
172 * protection against other writers.
174 * See, for example usages, register_netdevice() and
175 * unregister_netdevice(), which must be called with the rtnl
178 DEFINE_RWLOCK(dev_base_lock
);
179 EXPORT_SYMBOL(dev_base_lock
);
181 /* protects napi_hash addition/deletion and napi_gen_id */
182 static DEFINE_SPINLOCK(napi_hash_lock
);
184 static unsigned int napi_gen_id
;
185 static DEFINE_HASHTABLE(napi_hash
, 8);
187 static seqcount_t devnet_rename_seq
;
189 static inline void dev_base_seq_inc(struct net
*net
)
191 while (++net
->dev_base_seq
== 0);
194 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
196 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
198 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
201 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
203 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
206 static inline void rps_lock(struct softnet_data
*sd
)
209 spin_lock(&sd
->input_pkt_queue
.lock
);
213 static inline void rps_unlock(struct softnet_data
*sd
)
216 spin_unlock(&sd
->input_pkt_queue
.lock
);
220 /* Device list insertion */
221 static void list_netdevice(struct net_device
*dev
)
223 struct net
*net
= dev_net(dev
);
227 write_lock_bh(&dev_base_lock
);
228 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
229 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
230 hlist_add_head_rcu(&dev
->index_hlist
,
231 dev_index_hash(net
, dev
->ifindex
));
232 write_unlock_bh(&dev_base_lock
);
234 dev_base_seq_inc(net
);
237 /* Device list removal
238 * caller must respect a RCU grace period before freeing/reusing dev
240 static void unlist_netdevice(struct net_device
*dev
)
244 /* Unlink dev from the device chain */
245 write_lock_bh(&dev_base_lock
);
246 list_del_rcu(&dev
->dev_list
);
247 hlist_del_rcu(&dev
->name_hlist
);
248 hlist_del_rcu(&dev
->index_hlist
);
249 write_unlock_bh(&dev_base_lock
);
251 dev_base_seq_inc(dev_net(dev
));
258 static RAW_NOTIFIER_HEAD(netdev_chain
);
261 * Device drivers call our routines to queue packets here. We empty the
262 * queue in the local softnet handler.
265 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
266 EXPORT_PER_CPU_SYMBOL(softnet_data
);
268 #ifdef CONFIG_LOCKDEP
270 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
271 * according to dev->type
273 static const unsigned short netdev_lock_type
[] =
274 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
275 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
276 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
277 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
278 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
279 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
280 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
281 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
282 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
283 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
284 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
285 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
286 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
287 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
288 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
290 static const char *const netdev_lock_name
[] =
291 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
292 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
293 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
294 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
295 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
296 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
297 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
298 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
299 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
300 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
301 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
302 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
303 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
304 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
305 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
307 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
308 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
310 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
314 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
315 if (netdev_lock_type
[i
] == dev_type
)
317 /* the last key is used by default */
318 return ARRAY_SIZE(netdev_lock_type
) - 1;
321 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
322 unsigned short dev_type
)
326 i
= netdev_lock_pos(dev_type
);
327 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
328 netdev_lock_name
[i
]);
331 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
335 i
= netdev_lock_pos(dev
->type
);
336 lockdep_set_class_and_name(&dev
->addr_list_lock
,
337 &netdev_addr_lock_key
[i
],
338 netdev_lock_name
[i
]);
341 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
342 unsigned short dev_type
)
345 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
350 /*******************************************************************************
352 Protocol management and registration routines
354 *******************************************************************************/
357 * Add a protocol ID to the list. Now that the input handler is
358 * smarter we can dispense with all the messy stuff that used to be
361 * BEWARE!!! Protocol handlers, mangling input packets,
362 * MUST BE last in hash buckets and checking protocol handlers
363 * MUST start from promiscuous ptype_all chain in net_bh.
364 * It is true now, do not change it.
365 * Explanation follows: if protocol handler, mangling packet, will
366 * be the first on list, it is not able to sense, that packet
367 * is cloned and should be copied-on-write, so that it will
368 * change it and subsequent readers will get broken packet.
372 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
374 if (pt
->type
== htons(ETH_P_ALL
))
375 return pt
->dev
? &pt
->dev
->ptype_all
: &ptype_all
;
377 return pt
->dev
? &pt
->dev
->ptype_specific
:
378 &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
382 * dev_add_pack - add packet handler
383 * @pt: packet type declaration
385 * Add a protocol handler to the networking stack. The passed &packet_type
386 * is linked into kernel lists and may not be freed until it has been
387 * removed from the kernel lists.
389 * This call does not sleep therefore it can not
390 * guarantee all CPU's that are in middle of receiving packets
391 * will see the new packet type (until the next received packet).
394 void dev_add_pack(struct packet_type
*pt
)
396 struct list_head
*head
= ptype_head(pt
);
398 spin_lock(&ptype_lock
);
399 list_add_rcu(&pt
->list
, head
);
400 spin_unlock(&ptype_lock
);
402 EXPORT_SYMBOL(dev_add_pack
);
405 * __dev_remove_pack - remove packet handler
406 * @pt: packet type declaration
408 * Remove a protocol handler that was previously added to the kernel
409 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
410 * from the kernel lists and can be freed or reused once this function
413 * The packet type might still be in use by receivers
414 * and must not be freed until after all the CPU's have gone
415 * through a quiescent state.
417 void __dev_remove_pack(struct packet_type
*pt
)
419 struct list_head
*head
= ptype_head(pt
);
420 struct packet_type
*pt1
;
422 spin_lock(&ptype_lock
);
424 list_for_each_entry(pt1
, head
, list
) {
426 list_del_rcu(&pt
->list
);
431 pr_warn("dev_remove_pack: %p not found\n", pt
);
433 spin_unlock(&ptype_lock
);
435 EXPORT_SYMBOL(__dev_remove_pack
);
438 * dev_remove_pack - remove packet handler
439 * @pt: packet type declaration
441 * Remove a protocol handler that was previously added to the kernel
442 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
443 * from the kernel lists and can be freed or reused once this function
446 * This call sleeps to guarantee that no CPU is looking at the packet
449 void dev_remove_pack(struct packet_type
*pt
)
451 __dev_remove_pack(pt
);
455 EXPORT_SYMBOL(dev_remove_pack
);
459 * dev_add_offload - register offload handlers
460 * @po: protocol offload declaration
462 * Add protocol offload handlers to the networking stack. The passed
463 * &proto_offload is linked into kernel lists and may not be freed until
464 * it has been removed from the kernel lists.
466 * This call does not sleep therefore it can not
467 * guarantee all CPU's that are in middle of receiving packets
468 * will see the new offload handlers (until the next received packet).
470 void dev_add_offload(struct packet_offload
*po
)
472 struct packet_offload
*elem
;
474 spin_lock(&offload_lock
);
475 list_for_each_entry(elem
, &offload_base
, list
) {
476 if (po
->priority
< elem
->priority
)
479 list_add_rcu(&po
->list
, elem
->list
.prev
);
480 spin_unlock(&offload_lock
);
482 EXPORT_SYMBOL(dev_add_offload
);
485 * __dev_remove_offload - remove offload handler
486 * @po: packet offload declaration
488 * Remove a protocol offload handler that was previously added to the
489 * kernel offload handlers by dev_add_offload(). The passed &offload_type
490 * is removed from the kernel lists and can be freed or reused once this
493 * The packet type might still be in use by receivers
494 * and must not be freed until after all the CPU's have gone
495 * through a quiescent state.
497 static void __dev_remove_offload(struct packet_offload
*po
)
499 struct list_head
*head
= &offload_base
;
500 struct packet_offload
*po1
;
502 spin_lock(&offload_lock
);
504 list_for_each_entry(po1
, head
, list
) {
506 list_del_rcu(&po
->list
);
511 pr_warn("dev_remove_offload: %p not found\n", po
);
513 spin_unlock(&offload_lock
);
517 * dev_remove_offload - remove packet offload handler
518 * @po: packet offload declaration
520 * Remove a packet offload handler that was previously added to the kernel
521 * offload handlers by dev_add_offload(). The passed &offload_type is
522 * removed from the kernel lists and can be freed or reused once this
525 * This call sleeps to guarantee that no CPU is looking at the packet
528 void dev_remove_offload(struct packet_offload
*po
)
530 __dev_remove_offload(po
);
534 EXPORT_SYMBOL(dev_remove_offload
);
536 /******************************************************************************
538 Device Boot-time Settings Routines
540 *******************************************************************************/
542 /* Boot time configuration table */
543 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
546 * netdev_boot_setup_add - add new setup entry
547 * @name: name of the device
548 * @map: configured settings for the device
550 * Adds new setup entry to the dev_boot_setup list. The function
551 * returns 0 on error and 1 on success. This is a generic routine to
554 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
556 struct netdev_boot_setup
*s
;
560 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
561 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
562 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
563 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
564 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
569 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
573 * netdev_boot_setup_check - check boot time settings
574 * @dev: the netdevice
576 * Check boot time settings for the device.
577 * The found settings are set for the device to be used
578 * later in the device probing.
579 * Returns 0 if no settings found, 1 if they are.
581 int netdev_boot_setup_check(struct net_device
*dev
)
583 struct netdev_boot_setup
*s
= dev_boot_setup
;
586 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
587 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
588 !strcmp(dev
->name
, s
[i
].name
)) {
589 dev
->irq
= s
[i
].map
.irq
;
590 dev
->base_addr
= s
[i
].map
.base_addr
;
591 dev
->mem_start
= s
[i
].map
.mem_start
;
592 dev
->mem_end
= s
[i
].map
.mem_end
;
598 EXPORT_SYMBOL(netdev_boot_setup_check
);
602 * netdev_boot_base - get address from boot time settings
603 * @prefix: prefix for network device
604 * @unit: id for network device
606 * Check boot time settings for the base address of device.
607 * The found settings are set for the device to be used
608 * later in the device probing.
609 * Returns 0 if no settings found.
611 unsigned long netdev_boot_base(const char *prefix
, int unit
)
613 const struct netdev_boot_setup
*s
= dev_boot_setup
;
617 sprintf(name
, "%s%d", prefix
, unit
);
620 * If device already registered then return base of 1
621 * to indicate not to probe for this interface
623 if (__dev_get_by_name(&init_net
, name
))
626 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
627 if (!strcmp(name
, s
[i
].name
))
628 return s
[i
].map
.base_addr
;
633 * Saves at boot time configured settings for any netdevice.
635 int __init
netdev_boot_setup(char *str
)
640 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
645 memset(&map
, 0, sizeof(map
));
649 map
.base_addr
= ints
[2];
651 map
.mem_start
= ints
[3];
653 map
.mem_end
= ints
[4];
655 /* Add new entry to the list */
656 return netdev_boot_setup_add(str
, &map
);
659 __setup("netdev=", netdev_boot_setup
);
661 /*******************************************************************************
663 Device Interface Subroutines
665 *******************************************************************************/
668 * dev_get_iflink - get 'iflink' value of a interface
669 * @dev: targeted interface
671 * Indicates the ifindex the interface is linked to.
672 * Physical interfaces have the same 'ifindex' and 'iflink' values.
675 int dev_get_iflink(const struct net_device
*dev
)
677 if (dev
->netdev_ops
&& dev
->netdev_ops
->ndo_get_iflink
)
678 return dev
->netdev_ops
->ndo_get_iflink(dev
);
682 EXPORT_SYMBOL(dev_get_iflink
);
685 * __dev_get_by_name - find a device by its name
686 * @net: the applicable net namespace
687 * @name: name to find
689 * Find an interface by name. Must be called under RTNL semaphore
690 * or @dev_base_lock. If the name is found a pointer to the device
691 * is returned. If the name is not found then %NULL is returned. The
692 * reference counters are not incremented so the caller must be
693 * careful with locks.
696 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
698 struct net_device
*dev
;
699 struct hlist_head
*head
= dev_name_hash(net
, name
);
701 hlist_for_each_entry(dev
, head
, name_hlist
)
702 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
707 EXPORT_SYMBOL(__dev_get_by_name
);
710 * dev_get_by_name_rcu - find a device by its name
711 * @net: the applicable net namespace
712 * @name: name to find
714 * Find an interface by name.
715 * If the name is found a pointer to the device is returned.
716 * If the name is not found then %NULL is returned.
717 * The reference counters are not incremented so the caller must be
718 * careful with locks. The caller must hold RCU lock.
721 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
723 struct net_device
*dev
;
724 struct hlist_head
*head
= dev_name_hash(net
, name
);
726 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
727 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
732 EXPORT_SYMBOL(dev_get_by_name_rcu
);
735 * dev_get_by_name - find a device by its name
736 * @net: the applicable net namespace
737 * @name: name to find
739 * Find an interface by name. This can be called from any
740 * context and does its own locking. The returned handle has
741 * the usage count incremented and the caller must use dev_put() to
742 * release it when it is no longer needed. %NULL is returned if no
743 * matching device is found.
746 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
748 struct net_device
*dev
;
751 dev
= dev_get_by_name_rcu(net
, name
);
757 EXPORT_SYMBOL(dev_get_by_name
);
760 * __dev_get_by_index - find a device by its ifindex
761 * @net: the applicable net namespace
762 * @ifindex: index of device
764 * Search for an interface by index. Returns %NULL if the device
765 * is not found or a pointer to the device. The device has not
766 * had its reference counter increased so the caller must be careful
767 * about locking. The caller must hold either the RTNL semaphore
771 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
773 struct net_device
*dev
;
774 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
776 hlist_for_each_entry(dev
, head
, index_hlist
)
777 if (dev
->ifindex
== ifindex
)
782 EXPORT_SYMBOL(__dev_get_by_index
);
785 * dev_get_by_index_rcu - find a device by its ifindex
786 * @net: the applicable net namespace
787 * @ifindex: index of device
789 * Search for an interface by index. Returns %NULL if the device
790 * is not found or a pointer to the device. The device has not
791 * had its reference counter increased so the caller must be careful
792 * about locking. The caller must hold RCU lock.
795 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
797 struct net_device
*dev
;
798 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
800 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
801 if (dev
->ifindex
== ifindex
)
806 EXPORT_SYMBOL(dev_get_by_index_rcu
);
810 * dev_get_by_index - find a device by its ifindex
811 * @net: the applicable net namespace
812 * @ifindex: index of device
814 * Search for an interface by index. Returns NULL if the device
815 * is not found or a pointer to the device. The device returned has
816 * had a reference added and the pointer is safe until the user calls
817 * dev_put to indicate they have finished with it.
820 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
822 struct net_device
*dev
;
825 dev
= dev_get_by_index_rcu(net
, ifindex
);
831 EXPORT_SYMBOL(dev_get_by_index
);
834 * netdev_get_name - get a netdevice name, knowing its ifindex.
835 * @net: network namespace
836 * @name: a pointer to the buffer where the name will be stored.
837 * @ifindex: the ifindex of the interface to get the name from.
839 * The use of raw_seqcount_begin() and cond_resched() before
840 * retrying is required as we want to give the writers a chance
841 * to complete when CONFIG_PREEMPT is not set.
843 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
845 struct net_device
*dev
;
849 seq
= raw_seqcount_begin(&devnet_rename_seq
);
851 dev
= dev_get_by_index_rcu(net
, ifindex
);
857 strcpy(name
, dev
->name
);
859 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
868 * dev_getbyhwaddr_rcu - find a device by its hardware address
869 * @net: the applicable net namespace
870 * @type: media type of device
871 * @ha: hardware address
873 * Search for an interface by MAC address. Returns NULL if the device
874 * is not found or a pointer to the device.
875 * The caller must hold RCU or RTNL.
876 * The returned device has not had its ref count increased
877 * and the caller must therefore be careful about locking
881 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
884 struct net_device
*dev
;
886 for_each_netdev_rcu(net
, dev
)
887 if (dev
->type
== type
&&
888 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
893 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
895 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
897 struct net_device
*dev
;
900 for_each_netdev(net
, dev
)
901 if (dev
->type
== type
)
906 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
908 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
910 struct net_device
*dev
, *ret
= NULL
;
913 for_each_netdev_rcu(net
, dev
)
914 if (dev
->type
== type
) {
922 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
925 * __dev_get_by_flags - find any device with given flags
926 * @net: the applicable net namespace
927 * @if_flags: IFF_* values
928 * @mask: bitmask of bits in if_flags to check
930 * Search for any interface with the given flags. Returns NULL if a device
931 * is not found or a pointer to the device. Must be called inside
932 * rtnl_lock(), and result refcount is unchanged.
935 struct net_device
*__dev_get_by_flags(struct net
*net
, unsigned short if_flags
,
938 struct net_device
*dev
, *ret
;
943 for_each_netdev(net
, dev
) {
944 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
951 EXPORT_SYMBOL(__dev_get_by_flags
);
954 * dev_valid_name - check if name is okay for network device
957 * Network device names need to be valid file names to
958 * to allow sysfs to work. We also disallow any kind of
961 bool dev_valid_name(const char *name
)
965 if (strlen(name
) >= IFNAMSIZ
)
967 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
971 if (*name
== '/' || *name
== ':' || isspace(*name
))
977 EXPORT_SYMBOL(dev_valid_name
);
980 * __dev_alloc_name - allocate a name for a device
981 * @net: network namespace to allocate the device name in
982 * @name: name format string
983 * @buf: scratch buffer and result name string
985 * Passed a format string - eg "lt%d" it will try and find a suitable
986 * id. It scans list of devices to build up a free map, then chooses
987 * the first empty slot. The caller must hold the dev_base or rtnl lock
988 * while allocating the name and adding the device in order to avoid
990 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
991 * Returns the number of the unit assigned or a negative errno code.
994 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
998 const int max_netdevices
= 8*PAGE_SIZE
;
999 unsigned long *inuse
;
1000 struct net_device
*d
;
1002 p
= strnchr(name
, IFNAMSIZ
-1, '%');
1005 * Verify the string as this thing may have come from
1006 * the user. There must be either one "%d" and no other "%"
1009 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
1012 /* Use one page as a bit array of possible slots */
1013 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
1017 for_each_netdev(net
, d
) {
1018 if (!sscanf(d
->name
, name
, &i
))
1020 if (i
< 0 || i
>= max_netdevices
)
1023 /* avoid cases where sscanf is not exact inverse of printf */
1024 snprintf(buf
, IFNAMSIZ
, name
, i
);
1025 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
1029 i
= find_first_zero_bit(inuse
, max_netdevices
);
1030 free_page((unsigned long) inuse
);
1034 snprintf(buf
, IFNAMSIZ
, name
, i
);
1035 if (!__dev_get_by_name(net
, buf
))
1038 /* It is possible to run out of possible slots
1039 * when the name is long and there isn't enough space left
1040 * for the digits, or if all bits are used.
1046 * dev_alloc_name - allocate a name for a device
1048 * @name: name format string
1050 * Passed a format string - eg "lt%d" it will try and find a suitable
1051 * id. It scans list of devices to build up a free map, then chooses
1052 * the first empty slot. The caller must hold the dev_base or rtnl lock
1053 * while allocating the name and adding the device in order to avoid
1055 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1056 * Returns the number of the unit assigned or a negative errno code.
1059 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1065 BUG_ON(!dev_net(dev
));
1067 ret
= __dev_alloc_name(net
, name
, buf
);
1069 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1072 EXPORT_SYMBOL(dev_alloc_name
);
1074 static int dev_alloc_name_ns(struct net
*net
,
1075 struct net_device
*dev
,
1081 ret
= __dev_alloc_name(net
, name
, buf
);
1083 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1087 static int dev_get_valid_name(struct net
*net
,
1088 struct net_device
*dev
,
1093 if (!dev_valid_name(name
))
1096 if (strchr(name
, '%'))
1097 return dev_alloc_name_ns(net
, dev
, name
);
1098 else if (__dev_get_by_name(net
, name
))
1100 else if (dev
->name
!= name
)
1101 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1107 * dev_change_name - change name of a device
1109 * @newname: name (or format string) must be at least IFNAMSIZ
1111 * Change name of a device, can pass format strings "eth%d".
1114 int dev_change_name(struct net_device
*dev
, const char *newname
)
1116 unsigned char old_assign_type
;
1117 char oldname
[IFNAMSIZ
];
1123 BUG_ON(!dev_net(dev
));
1126 if (dev
->flags
& IFF_UP
)
1129 write_seqcount_begin(&devnet_rename_seq
);
1131 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1132 write_seqcount_end(&devnet_rename_seq
);
1136 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1138 err
= dev_get_valid_name(net
, dev
, newname
);
1140 write_seqcount_end(&devnet_rename_seq
);
1144 if (oldname
[0] && !strchr(oldname
, '%'))
1145 netdev_info(dev
, "renamed from %s\n", oldname
);
1147 old_assign_type
= dev
->name_assign_type
;
1148 dev
->name_assign_type
= NET_NAME_RENAMED
;
1151 ret
= device_rename(&dev
->dev
, dev
->name
);
1153 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1154 dev
->name_assign_type
= old_assign_type
;
1155 write_seqcount_end(&devnet_rename_seq
);
1159 write_seqcount_end(&devnet_rename_seq
);
1161 netdev_adjacent_rename_links(dev
, oldname
);
1163 write_lock_bh(&dev_base_lock
);
1164 hlist_del_rcu(&dev
->name_hlist
);
1165 write_unlock_bh(&dev_base_lock
);
1169 write_lock_bh(&dev_base_lock
);
1170 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1171 write_unlock_bh(&dev_base_lock
);
1173 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1174 ret
= notifier_to_errno(ret
);
1177 /* err >= 0 after dev_alloc_name() or stores the first errno */
1180 write_seqcount_begin(&devnet_rename_seq
);
1181 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1182 memcpy(oldname
, newname
, IFNAMSIZ
);
1183 dev
->name_assign_type
= old_assign_type
;
1184 old_assign_type
= NET_NAME_RENAMED
;
1187 pr_err("%s: name change rollback failed: %d\n",
1196 * dev_set_alias - change ifalias of a device
1198 * @alias: name up to IFALIASZ
1199 * @len: limit of bytes to copy from info
1201 * Set ifalias for a device,
1203 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1209 if (len
>= IFALIASZ
)
1213 kfree(dev
->ifalias
);
1214 dev
->ifalias
= NULL
;
1218 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1221 dev
->ifalias
= new_ifalias
;
1223 strlcpy(dev
->ifalias
, alias
, len
+1);
1229 * netdev_features_change - device changes features
1230 * @dev: device to cause notification
1232 * Called to indicate a device has changed features.
1234 void netdev_features_change(struct net_device
*dev
)
1236 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1238 EXPORT_SYMBOL(netdev_features_change
);
1241 * netdev_state_change - device changes state
1242 * @dev: device to cause notification
1244 * Called to indicate a device has changed state. This function calls
1245 * the notifier chains for netdev_chain and sends a NEWLINK message
1246 * to the routing socket.
1248 void netdev_state_change(struct net_device
*dev
)
1250 if (dev
->flags
& IFF_UP
) {
1251 struct netdev_notifier_change_info change_info
;
1253 change_info
.flags_changed
= 0;
1254 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
1256 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1259 EXPORT_SYMBOL(netdev_state_change
);
1262 * netdev_notify_peers - notify network peers about existence of @dev
1263 * @dev: network device
1265 * Generate traffic such that interested network peers are aware of
1266 * @dev, such as by generating a gratuitous ARP. This may be used when
1267 * a device wants to inform the rest of the network about some sort of
1268 * reconfiguration such as a failover event or virtual machine
1271 void netdev_notify_peers(struct net_device
*dev
)
1274 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1277 EXPORT_SYMBOL(netdev_notify_peers
);
1279 static int __dev_open(struct net_device
*dev
)
1281 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1286 if (!netif_device_present(dev
))
1289 /* Block netpoll from trying to do any rx path servicing.
1290 * If we don't do this there is a chance ndo_poll_controller
1291 * or ndo_poll may be running while we open the device
1293 netpoll_poll_disable(dev
);
1295 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1296 ret
= notifier_to_errno(ret
);
1300 set_bit(__LINK_STATE_START
, &dev
->state
);
1302 if (ops
->ndo_validate_addr
)
1303 ret
= ops
->ndo_validate_addr(dev
);
1305 if (!ret
&& ops
->ndo_open
)
1306 ret
= ops
->ndo_open(dev
);
1308 netpoll_poll_enable(dev
);
1311 clear_bit(__LINK_STATE_START
, &dev
->state
);
1313 dev
->flags
|= IFF_UP
;
1314 dev_set_rx_mode(dev
);
1316 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1323 * dev_open - prepare an interface for use.
1324 * @dev: device to open
1326 * Takes a device from down to up state. The device's private open
1327 * function is invoked and then the multicast lists are loaded. Finally
1328 * the device is moved into the up state and a %NETDEV_UP message is
1329 * sent to the netdev notifier chain.
1331 * Calling this function on an active interface is a nop. On a failure
1332 * a negative errno code is returned.
1334 int dev_open(struct net_device
*dev
)
1338 if (dev
->flags
& IFF_UP
)
1341 ret
= __dev_open(dev
);
1345 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1346 call_netdevice_notifiers(NETDEV_UP
, dev
);
1350 EXPORT_SYMBOL(dev_open
);
1352 static int __dev_close_many(struct list_head
*head
)
1354 struct net_device
*dev
;
1359 list_for_each_entry(dev
, head
, close_list
) {
1360 /* Temporarily disable netpoll until the interface is down */
1361 netpoll_poll_disable(dev
);
1363 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1365 clear_bit(__LINK_STATE_START
, &dev
->state
);
1367 /* Synchronize to scheduled poll. We cannot touch poll list, it
1368 * can be even on different cpu. So just clear netif_running().
1370 * dev->stop() will invoke napi_disable() on all of it's
1371 * napi_struct instances on this device.
1373 smp_mb__after_atomic(); /* Commit netif_running(). */
1376 dev_deactivate_many(head
);
1378 list_for_each_entry(dev
, head
, close_list
) {
1379 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1382 * Call the device specific close. This cannot fail.
1383 * Only if device is UP
1385 * We allow it to be called even after a DETACH hot-plug
1391 dev
->flags
&= ~IFF_UP
;
1392 netpoll_poll_enable(dev
);
1398 static int __dev_close(struct net_device
*dev
)
1403 list_add(&dev
->close_list
, &single
);
1404 retval
= __dev_close_many(&single
);
1410 int dev_close_many(struct list_head
*head
, bool unlink
)
1412 struct net_device
*dev
, *tmp
;
1414 /* Remove the devices that don't need to be closed */
1415 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1416 if (!(dev
->flags
& IFF_UP
))
1417 list_del_init(&dev
->close_list
);
1419 __dev_close_many(head
);
1421 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1422 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1423 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1425 list_del_init(&dev
->close_list
);
1430 EXPORT_SYMBOL(dev_close_many
);
1433 * dev_close - shutdown an interface.
1434 * @dev: device to shutdown
1436 * This function moves an active device into down state. A
1437 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1438 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1441 int dev_close(struct net_device
*dev
)
1443 if (dev
->flags
& IFF_UP
) {
1446 list_add(&dev
->close_list
, &single
);
1447 dev_close_many(&single
, true);
1452 EXPORT_SYMBOL(dev_close
);
1456 * dev_disable_lro - disable Large Receive Offload on a device
1459 * Disable Large Receive Offload (LRO) on a net device. Must be
1460 * called under RTNL. This is needed if received packets may be
1461 * forwarded to another interface.
1463 void dev_disable_lro(struct net_device
*dev
)
1465 struct net_device
*lower_dev
;
1466 struct list_head
*iter
;
1468 dev
->wanted_features
&= ~NETIF_F_LRO
;
1469 netdev_update_features(dev
);
1471 if (unlikely(dev
->features
& NETIF_F_LRO
))
1472 netdev_WARN(dev
, "failed to disable LRO!\n");
1474 netdev_for_each_lower_dev(dev
, lower_dev
, iter
)
1475 dev_disable_lro(lower_dev
);
1477 EXPORT_SYMBOL(dev_disable_lro
);
1479 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1480 struct net_device
*dev
)
1482 struct netdev_notifier_info info
;
1484 netdev_notifier_info_init(&info
, dev
);
1485 return nb
->notifier_call(nb
, val
, &info
);
1488 static int dev_boot_phase
= 1;
1491 * register_netdevice_notifier - register a network notifier block
1494 * Register a notifier to be called when network device events occur.
1495 * The notifier passed is linked into the kernel structures and must
1496 * not be reused until it has been unregistered. A negative errno code
1497 * is returned on a failure.
1499 * When registered all registration and up events are replayed
1500 * to the new notifier to allow device to have a race free
1501 * view of the network device list.
1504 int register_netdevice_notifier(struct notifier_block
*nb
)
1506 struct net_device
*dev
;
1507 struct net_device
*last
;
1512 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1518 for_each_netdev(net
, dev
) {
1519 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1520 err
= notifier_to_errno(err
);
1524 if (!(dev
->flags
& IFF_UP
))
1527 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1538 for_each_netdev(net
, dev
) {
1542 if (dev
->flags
& IFF_UP
) {
1543 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1545 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1547 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1552 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1555 EXPORT_SYMBOL(register_netdevice_notifier
);
1558 * unregister_netdevice_notifier - unregister a network notifier block
1561 * Unregister a notifier previously registered by
1562 * register_netdevice_notifier(). The notifier is unlinked into the
1563 * kernel structures and may then be reused. A negative errno code
1564 * is returned on a failure.
1566 * After unregistering unregister and down device events are synthesized
1567 * for all devices on the device list to the removed notifier to remove
1568 * the need for special case cleanup code.
1571 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1573 struct net_device
*dev
;
1578 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1583 for_each_netdev(net
, dev
) {
1584 if (dev
->flags
& IFF_UP
) {
1585 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1587 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1589 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1596 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1599 * call_netdevice_notifiers_info - call all network notifier blocks
1600 * @val: value passed unmodified to notifier function
1601 * @dev: net_device pointer passed unmodified to notifier function
1602 * @info: notifier information data
1604 * Call all network notifier blocks. Parameters and return value
1605 * are as for raw_notifier_call_chain().
1608 static int call_netdevice_notifiers_info(unsigned long val
,
1609 struct net_device
*dev
,
1610 struct netdev_notifier_info
*info
)
1613 netdev_notifier_info_init(info
, dev
);
1614 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1618 * call_netdevice_notifiers - call all network notifier blocks
1619 * @val: value passed unmodified to notifier function
1620 * @dev: net_device pointer passed unmodified to notifier function
1622 * Call all network notifier blocks. Parameters and return value
1623 * are as for raw_notifier_call_chain().
1626 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1628 struct netdev_notifier_info info
;
1630 return call_netdevice_notifiers_info(val
, dev
, &info
);
1632 EXPORT_SYMBOL(call_netdevice_notifiers
);
1634 #ifdef CONFIG_NET_INGRESS
1635 static struct static_key ingress_needed __read_mostly
;
1637 void net_inc_ingress_queue(void)
1639 static_key_slow_inc(&ingress_needed
);
1641 EXPORT_SYMBOL_GPL(net_inc_ingress_queue
);
1643 void net_dec_ingress_queue(void)
1645 static_key_slow_dec(&ingress_needed
);
1647 EXPORT_SYMBOL_GPL(net_dec_ingress_queue
);
1650 static struct static_key netstamp_needed __read_mostly
;
1651 #ifdef HAVE_JUMP_LABEL
1652 /* We are not allowed to call static_key_slow_dec() from irq context
1653 * If net_disable_timestamp() is called from irq context, defer the
1654 * static_key_slow_dec() calls.
1656 static atomic_t netstamp_needed_deferred
;
1659 void net_enable_timestamp(void)
1661 #ifdef HAVE_JUMP_LABEL
1662 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1666 static_key_slow_dec(&netstamp_needed
);
1670 static_key_slow_inc(&netstamp_needed
);
1672 EXPORT_SYMBOL(net_enable_timestamp
);
1674 void net_disable_timestamp(void)
1676 #ifdef HAVE_JUMP_LABEL
1677 if (in_interrupt()) {
1678 atomic_inc(&netstamp_needed_deferred
);
1682 static_key_slow_dec(&netstamp_needed
);
1684 EXPORT_SYMBOL(net_disable_timestamp
);
1686 static inline void net_timestamp_set(struct sk_buff
*skb
)
1688 skb
->tstamp
.tv64
= 0;
1689 if (static_key_false(&netstamp_needed
))
1690 __net_timestamp(skb
);
1693 #define net_timestamp_check(COND, SKB) \
1694 if (static_key_false(&netstamp_needed)) { \
1695 if ((COND) && !(SKB)->tstamp.tv64) \
1696 __net_timestamp(SKB); \
1699 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1703 if (!(dev
->flags
& IFF_UP
))
1706 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1707 if (skb
->len
<= len
)
1710 /* if TSO is enabled, we don't care about the length as the packet
1711 * could be forwarded without being segmented before
1713 if (skb_is_gso(skb
))
1718 EXPORT_SYMBOL_GPL(is_skb_forwardable
);
1720 int __dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1722 if (skb_orphan_frags(skb
, GFP_ATOMIC
) ||
1723 unlikely(!is_skb_forwardable(dev
, skb
))) {
1724 atomic_long_inc(&dev
->rx_dropped
);
1729 skb_scrub_packet(skb
, true);
1731 skb
->protocol
= eth_type_trans(skb
, dev
);
1732 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
1736 EXPORT_SYMBOL_GPL(__dev_forward_skb
);
1739 * dev_forward_skb - loopback an skb to another netif
1741 * @dev: destination network device
1742 * @skb: buffer to forward
1745 * NET_RX_SUCCESS (no congestion)
1746 * NET_RX_DROP (packet was dropped, but freed)
1748 * dev_forward_skb can be used for injecting an skb from the
1749 * start_xmit function of one device into the receive queue
1750 * of another device.
1752 * The receiving device may be in another namespace, so
1753 * we have to clear all information in the skb that could
1754 * impact namespace isolation.
1756 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1758 return __dev_forward_skb(dev
, skb
) ?: netif_rx_internal(skb
);
1760 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1762 static inline int deliver_skb(struct sk_buff
*skb
,
1763 struct packet_type
*pt_prev
,
1764 struct net_device
*orig_dev
)
1766 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1768 atomic_inc(&skb
->users
);
1769 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1772 static inline void deliver_ptype_list_skb(struct sk_buff
*skb
,
1773 struct packet_type
**pt
,
1774 struct net_device
*orig_dev
,
1776 struct list_head
*ptype_list
)
1778 struct packet_type
*ptype
, *pt_prev
= *pt
;
1780 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1781 if (ptype
->type
!= type
)
1784 deliver_skb(skb
, pt_prev
, orig_dev
);
1790 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1792 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1795 if (ptype
->id_match
)
1796 return ptype
->id_match(ptype
, skb
->sk
);
1797 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1804 * Support routine. Sends outgoing frames to any network
1805 * taps currently in use.
1808 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1810 struct packet_type
*ptype
;
1811 struct sk_buff
*skb2
= NULL
;
1812 struct packet_type
*pt_prev
= NULL
;
1813 struct list_head
*ptype_list
= &ptype_all
;
1817 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1818 /* Never send packets back to the socket
1819 * they originated from - MvS (miquels@drinkel.ow.org)
1821 if (skb_loop_sk(ptype
, skb
))
1825 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1830 /* need to clone skb, done only once */
1831 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1835 net_timestamp_set(skb2
);
1837 /* skb->nh should be correctly
1838 * set by sender, so that the second statement is
1839 * just protection against buggy protocols.
1841 skb_reset_mac_header(skb2
);
1843 if (skb_network_header(skb2
) < skb2
->data
||
1844 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1845 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1846 ntohs(skb2
->protocol
),
1848 skb_reset_network_header(skb2
);
1851 skb2
->transport_header
= skb2
->network_header
;
1852 skb2
->pkt_type
= PACKET_OUTGOING
;
1856 if (ptype_list
== &ptype_all
) {
1857 ptype_list
= &dev
->ptype_all
;
1862 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1867 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1868 * @dev: Network device
1869 * @txq: number of queues available
1871 * If real_num_tx_queues is changed the tc mappings may no longer be
1872 * valid. To resolve this verify the tc mapping remains valid and if
1873 * not NULL the mapping. With no priorities mapping to this
1874 * offset/count pair it will no longer be used. In the worst case TC0
1875 * is invalid nothing can be done so disable priority mappings. If is
1876 * expected that drivers will fix this mapping if they can before
1877 * calling netif_set_real_num_tx_queues.
1879 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1882 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1884 /* If TC0 is invalidated disable TC mapping */
1885 if (tc
->offset
+ tc
->count
> txq
) {
1886 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1891 /* Invalidated prio to tc mappings set to TC0 */
1892 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1893 int q
= netdev_get_prio_tc_map(dev
, i
);
1895 tc
= &dev
->tc_to_txq
[q
];
1896 if (tc
->offset
+ tc
->count
> txq
) {
1897 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1899 netdev_set_prio_tc_map(dev
, i
, 0);
1905 static DEFINE_MUTEX(xps_map_mutex
);
1906 #define xmap_dereference(P) \
1907 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1909 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1912 struct xps_map
*map
= NULL
;
1916 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1918 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1919 if (map
->queues
[pos
] == index
) {
1921 map
->queues
[pos
] = map
->queues
[--map
->len
];
1923 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1924 kfree_rcu(map
, rcu
);
1934 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1936 struct xps_dev_maps
*dev_maps
;
1938 bool active
= false;
1940 mutex_lock(&xps_map_mutex
);
1941 dev_maps
= xmap_dereference(dev
->xps_maps
);
1946 for_each_possible_cpu(cpu
) {
1947 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1948 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1951 if (i
== dev
->num_tx_queues
)
1956 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1957 kfree_rcu(dev_maps
, rcu
);
1960 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1961 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1965 mutex_unlock(&xps_map_mutex
);
1968 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1971 struct xps_map
*new_map
;
1972 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1975 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1976 if (map
->queues
[pos
] != index
)
1981 /* Need to add queue to this CPU's existing map */
1983 if (pos
< map
->alloc_len
)
1986 alloc_len
= map
->alloc_len
* 2;
1989 /* Need to allocate new map to store queue on this CPU's map */
1990 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1995 for (i
= 0; i
< pos
; i
++)
1996 new_map
->queues
[i
] = map
->queues
[i
];
1997 new_map
->alloc_len
= alloc_len
;
2003 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
2006 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
2007 struct xps_map
*map
, *new_map
;
2008 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
2009 int cpu
, numa_node_id
= -2;
2010 bool active
= false;
2012 mutex_lock(&xps_map_mutex
);
2014 dev_maps
= xmap_dereference(dev
->xps_maps
);
2016 /* allocate memory for queue storage */
2017 for_each_online_cpu(cpu
) {
2018 if (!cpumask_test_cpu(cpu
, mask
))
2022 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
2023 if (!new_dev_maps
) {
2024 mutex_unlock(&xps_map_mutex
);
2028 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2031 map
= expand_xps_map(map
, cpu
, index
);
2035 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2039 goto out_no_new_maps
;
2041 for_each_possible_cpu(cpu
) {
2042 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
2043 /* add queue to CPU maps */
2046 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2047 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
2050 if (pos
== map
->len
)
2051 map
->queues
[map
->len
++] = index
;
2053 if (numa_node_id
== -2)
2054 numa_node_id
= cpu_to_node(cpu
);
2055 else if (numa_node_id
!= cpu_to_node(cpu
))
2058 } else if (dev_maps
) {
2059 /* fill in the new device map from the old device map */
2060 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2061 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2066 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
2068 /* Cleanup old maps */
2070 for_each_possible_cpu(cpu
) {
2071 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2072 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2073 if (map
&& map
!= new_map
)
2074 kfree_rcu(map
, rcu
);
2077 kfree_rcu(dev_maps
, rcu
);
2080 dev_maps
= new_dev_maps
;
2084 /* update Tx queue numa node */
2085 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2086 (numa_node_id
>= 0) ? numa_node_id
:
2092 /* removes queue from unused CPUs */
2093 for_each_possible_cpu(cpu
) {
2094 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2097 if (remove_xps_queue(dev_maps
, cpu
, index
))
2101 /* free map if not active */
2103 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2104 kfree_rcu(dev_maps
, rcu
);
2108 mutex_unlock(&xps_map_mutex
);
2112 /* remove any maps that we added */
2113 for_each_possible_cpu(cpu
) {
2114 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2115 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2117 if (new_map
&& new_map
!= map
)
2121 mutex_unlock(&xps_map_mutex
);
2123 kfree(new_dev_maps
);
2126 EXPORT_SYMBOL(netif_set_xps_queue
);
2130 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2131 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2133 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2137 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2140 if (dev
->reg_state
== NETREG_REGISTERED
||
2141 dev
->reg_state
== NETREG_UNREGISTERING
) {
2144 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2150 netif_setup_tc(dev
, txq
);
2152 if (txq
< dev
->real_num_tx_queues
) {
2153 qdisc_reset_all_tx_gt(dev
, txq
);
2155 netif_reset_xps_queues_gt(dev
, txq
);
2160 dev
->real_num_tx_queues
= txq
;
2163 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2167 * netif_set_real_num_rx_queues - set actual number of RX queues used
2168 * @dev: Network device
2169 * @rxq: Actual number of RX queues
2171 * This must be called either with the rtnl_lock held or before
2172 * registration of the net device. Returns 0 on success, or a
2173 * negative error code. If called before registration, it always
2176 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2180 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2183 if (dev
->reg_state
== NETREG_REGISTERED
) {
2186 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2192 dev
->real_num_rx_queues
= rxq
;
2195 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2199 * netif_get_num_default_rss_queues - default number of RSS queues
2201 * This routine should set an upper limit on the number of RSS queues
2202 * used by default by multiqueue devices.
2204 int netif_get_num_default_rss_queues(void)
2206 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2208 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2210 static inline void __netif_reschedule(struct Qdisc
*q
)
2212 struct softnet_data
*sd
;
2213 unsigned long flags
;
2215 local_irq_save(flags
);
2216 sd
= this_cpu_ptr(&softnet_data
);
2217 q
->next_sched
= NULL
;
2218 *sd
->output_queue_tailp
= q
;
2219 sd
->output_queue_tailp
= &q
->next_sched
;
2220 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2221 local_irq_restore(flags
);
2224 void __netif_schedule(struct Qdisc
*q
)
2226 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2227 __netif_reschedule(q
);
2229 EXPORT_SYMBOL(__netif_schedule
);
2231 struct dev_kfree_skb_cb
{
2232 enum skb_free_reason reason
;
2235 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2237 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2240 void netif_schedule_queue(struct netdev_queue
*txq
)
2243 if (!(txq
->state
& QUEUE_STATE_ANY_XOFF
)) {
2244 struct Qdisc
*q
= rcu_dereference(txq
->qdisc
);
2246 __netif_schedule(q
);
2250 EXPORT_SYMBOL(netif_schedule_queue
);
2253 * netif_wake_subqueue - allow sending packets on subqueue
2254 * @dev: network device
2255 * @queue_index: sub queue index
2257 * Resume individual transmit queue of a device with multiple transmit queues.
2259 void netif_wake_subqueue(struct net_device
*dev
, u16 queue_index
)
2261 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
2263 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &txq
->state
)) {
2267 q
= rcu_dereference(txq
->qdisc
);
2268 __netif_schedule(q
);
2272 EXPORT_SYMBOL(netif_wake_subqueue
);
2274 void netif_tx_wake_queue(struct netdev_queue
*dev_queue
)
2276 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &dev_queue
->state
)) {
2280 q
= rcu_dereference(dev_queue
->qdisc
);
2281 __netif_schedule(q
);
2285 EXPORT_SYMBOL(netif_tx_wake_queue
);
2287 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2289 unsigned long flags
;
2291 if (likely(atomic_read(&skb
->users
) == 1)) {
2293 atomic_set(&skb
->users
, 0);
2294 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2297 get_kfree_skb_cb(skb
)->reason
= reason
;
2298 local_irq_save(flags
);
2299 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2300 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2301 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2302 local_irq_restore(flags
);
2304 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2306 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2308 if (in_irq() || irqs_disabled())
2309 __dev_kfree_skb_irq(skb
, reason
);
2313 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2317 * netif_device_detach - mark device as removed
2318 * @dev: network device
2320 * Mark device as removed from system and therefore no longer available.
2322 void netif_device_detach(struct net_device
*dev
)
2324 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2325 netif_running(dev
)) {
2326 netif_tx_stop_all_queues(dev
);
2329 EXPORT_SYMBOL(netif_device_detach
);
2332 * netif_device_attach - mark device as attached
2333 * @dev: network device
2335 * Mark device as attached from system and restart if needed.
2337 void netif_device_attach(struct net_device
*dev
)
2339 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2340 netif_running(dev
)) {
2341 netif_tx_wake_all_queues(dev
);
2342 __netdev_watchdog_up(dev
);
2345 EXPORT_SYMBOL(netif_device_attach
);
2348 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2349 * to be used as a distribution range.
2351 u16
__skb_tx_hash(const struct net_device
*dev
, struct sk_buff
*skb
,
2352 unsigned int num_tx_queues
)
2356 u16 qcount
= num_tx_queues
;
2358 if (skb_rx_queue_recorded(skb
)) {
2359 hash
= skb_get_rx_queue(skb
);
2360 while (unlikely(hash
>= num_tx_queues
))
2361 hash
-= num_tx_queues
;
2366 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2367 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2368 qcount
= dev
->tc_to_txq
[tc
].count
;
2371 return (u16
) reciprocal_scale(skb_get_hash(skb
), qcount
) + qoffset
;
2373 EXPORT_SYMBOL(__skb_tx_hash
);
2375 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2377 static const netdev_features_t null_features
= 0;
2378 struct net_device
*dev
= skb
->dev
;
2379 const char *driver
= "";
2381 if (!net_ratelimit())
2384 if (dev
&& dev
->dev
.parent
)
2385 driver
= dev_driver_string(dev
->dev
.parent
);
2387 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2388 "gso_type=%d ip_summed=%d\n",
2389 driver
, dev
? &dev
->features
: &null_features
,
2390 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2391 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2392 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2396 * Invalidate hardware checksum when packet is to be mangled, and
2397 * complete checksum manually on outgoing path.
2399 int skb_checksum_help(struct sk_buff
*skb
)
2402 int ret
= 0, offset
;
2404 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2405 goto out_set_summed
;
2407 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2408 skb_warn_bad_offload(skb
);
2412 /* Before computing a checksum, we should make sure no frag could
2413 * be modified by an external entity : checksum could be wrong.
2415 if (skb_has_shared_frag(skb
)) {
2416 ret
= __skb_linearize(skb
);
2421 offset
= skb_checksum_start_offset(skb
);
2422 BUG_ON(offset
>= skb_headlen(skb
));
2423 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2425 offset
+= skb
->csum_offset
;
2426 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2428 if (skb_cloned(skb
) &&
2429 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2430 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2435 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2437 skb
->ip_summed
= CHECKSUM_NONE
;
2441 EXPORT_SYMBOL(skb_checksum_help
);
2443 __be16
skb_network_protocol(struct sk_buff
*skb
, int *depth
)
2445 __be16 type
= skb
->protocol
;
2447 /* Tunnel gso handlers can set protocol to ethernet. */
2448 if (type
== htons(ETH_P_TEB
)) {
2451 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2454 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2455 type
= eth
->h_proto
;
2458 return __vlan_get_protocol(skb
, type
, depth
);
2462 * skb_mac_gso_segment - mac layer segmentation handler.
2463 * @skb: buffer to segment
2464 * @features: features for the output path (see dev->features)
2466 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2467 netdev_features_t features
)
2469 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2470 struct packet_offload
*ptype
;
2471 int vlan_depth
= skb
->mac_len
;
2472 __be16 type
= skb_network_protocol(skb
, &vlan_depth
);
2474 if (unlikely(!type
))
2475 return ERR_PTR(-EINVAL
);
2477 __skb_pull(skb
, vlan_depth
);
2480 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2481 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2482 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2488 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2492 EXPORT_SYMBOL(skb_mac_gso_segment
);
2495 /* openvswitch calls this on rx path, so we need a different check.
2497 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2500 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2502 return skb
->ip_summed
== CHECKSUM_NONE
;
2506 * __skb_gso_segment - Perform segmentation on skb.
2507 * @skb: buffer to segment
2508 * @features: features for the output path (see dev->features)
2509 * @tx_path: whether it is called in TX path
2511 * This function segments the given skb and returns a list of segments.
2513 * It may return NULL if the skb requires no segmentation. This is
2514 * only possible when GSO is used for verifying header integrity.
2516 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2517 netdev_features_t features
, bool tx_path
)
2519 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2522 skb_warn_bad_offload(skb
);
2524 err
= skb_cow_head(skb
, 0);
2526 return ERR_PTR(err
);
2529 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2530 SKB_GSO_CB(skb
)->encap_level
= 0;
2532 skb_reset_mac_header(skb
);
2533 skb_reset_mac_len(skb
);
2535 return skb_mac_gso_segment(skb
, features
);
2537 EXPORT_SYMBOL(__skb_gso_segment
);
2539 /* Take action when hardware reception checksum errors are detected. */
2541 void netdev_rx_csum_fault(struct net_device
*dev
)
2543 if (net_ratelimit()) {
2544 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2548 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2551 /* Actually, we should eliminate this check as soon as we know, that:
2552 * 1. IOMMU is present and allows to map all the memory.
2553 * 2. No high memory really exists on this machine.
2556 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2558 #ifdef CONFIG_HIGHMEM
2560 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2561 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2562 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2563 if (PageHighMem(skb_frag_page(frag
)))
2568 if (PCI_DMA_BUS_IS_PHYS
) {
2569 struct device
*pdev
= dev
->dev
.parent
;
2573 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2574 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2575 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2576 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2584 /* If MPLS offload request, verify we are testing hardware MPLS features
2585 * instead of standard features for the netdev.
2587 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2588 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2589 netdev_features_t features
,
2592 if (eth_p_mpls(type
))
2593 features
&= skb
->dev
->mpls_features
;
2598 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2599 netdev_features_t features
,
2606 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2607 netdev_features_t features
)
2612 type
= skb_network_protocol(skb
, &tmp
);
2613 features
= net_mpls_features(skb
, features
, type
);
2615 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2616 !can_checksum_protocol(features
, type
)) {
2617 features
&= ~NETIF_F_ALL_CSUM
;
2618 } else if (illegal_highdma(skb
->dev
, skb
)) {
2619 features
&= ~NETIF_F_SG
;
2625 netdev_features_t
passthru_features_check(struct sk_buff
*skb
,
2626 struct net_device
*dev
,
2627 netdev_features_t features
)
2631 EXPORT_SYMBOL(passthru_features_check
);
2633 static netdev_features_t
dflt_features_check(const struct sk_buff
*skb
,
2634 struct net_device
*dev
,
2635 netdev_features_t features
)
2637 return vlan_features_check(skb
, features
);
2640 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2642 struct net_device
*dev
= skb
->dev
;
2643 netdev_features_t features
= dev
->features
;
2644 u16 gso_segs
= skb_shinfo(skb
)->gso_segs
;
2646 if (gso_segs
> dev
->gso_max_segs
|| gso_segs
< dev
->gso_min_segs
)
2647 features
&= ~NETIF_F_GSO_MASK
;
2649 /* If encapsulation offload request, verify we are testing
2650 * hardware encapsulation features instead of standard
2651 * features for the netdev
2653 if (skb
->encapsulation
)
2654 features
&= dev
->hw_enc_features
;
2656 if (skb_vlan_tagged(skb
))
2657 features
= netdev_intersect_features(features
,
2658 dev
->vlan_features
|
2659 NETIF_F_HW_VLAN_CTAG_TX
|
2660 NETIF_F_HW_VLAN_STAG_TX
);
2662 if (dev
->netdev_ops
->ndo_features_check
)
2663 features
&= dev
->netdev_ops
->ndo_features_check(skb
, dev
,
2666 features
&= dflt_features_check(skb
, dev
, features
);
2668 return harmonize_features(skb
, features
);
2670 EXPORT_SYMBOL(netif_skb_features
);
2672 static int xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
2673 struct netdev_queue
*txq
, bool more
)
2678 if (!list_empty(&ptype_all
) || !list_empty(&dev
->ptype_all
))
2679 dev_queue_xmit_nit(skb
, dev
);
2682 trace_net_dev_start_xmit(skb
, dev
);
2683 rc
= netdev_start_xmit(skb
, dev
, txq
, more
);
2684 trace_net_dev_xmit(skb
, rc
, dev
, len
);
2689 struct sk_buff
*dev_hard_start_xmit(struct sk_buff
*first
, struct net_device
*dev
,
2690 struct netdev_queue
*txq
, int *ret
)
2692 struct sk_buff
*skb
= first
;
2693 int rc
= NETDEV_TX_OK
;
2696 struct sk_buff
*next
= skb
->next
;
2699 rc
= xmit_one(skb
, dev
, txq
, next
!= NULL
);
2700 if (unlikely(!dev_xmit_complete(rc
))) {
2706 if (netif_xmit_stopped(txq
) && skb
) {
2707 rc
= NETDEV_TX_BUSY
;
2717 static struct sk_buff
*validate_xmit_vlan(struct sk_buff
*skb
,
2718 netdev_features_t features
)
2720 if (skb_vlan_tag_present(skb
) &&
2721 !vlan_hw_offload_capable(features
, skb
->vlan_proto
))
2722 skb
= __vlan_hwaccel_push_inside(skb
);
2726 static struct sk_buff
*validate_xmit_skb(struct sk_buff
*skb
, struct net_device
*dev
)
2728 netdev_features_t features
;
2733 features
= netif_skb_features(skb
);
2734 skb
= validate_xmit_vlan(skb
, features
);
2738 if (netif_needs_gso(skb
, features
)) {
2739 struct sk_buff
*segs
;
2741 segs
= skb_gso_segment(skb
, features
);
2749 if (skb_needs_linearize(skb
, features
) &&
2750 __skb_linearize(skb
))
2753 /* If packet is not checksummed and device does not
2754 * support checksumming for this protocol, complete
2755 * checksumming here.
2757 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2758 if (skb
->encapsulation
)
2759 skb_set_inner_transport_header(skb
,
2760 skb_checksum_start_offset(skb
));
2762 skb_set_transport_header(skb
,
2763 skb_checksum_start_offset(skb
));
2764 if (!(features
& NETIF_F_ALL_CSUM
) &&
2765 skb_checksum_help(skb
))
2778 struct sk_buff
*validate_xmit_skb_list(struct sk_buff
*skb
, struct net_device
*dev
)
2780 struct sk_buff
*next
, *head
= NULL
, *tail
;
2782 for (; skb
!= NULL
; skb
= next
) {
2786 /* in case skb wont be segmented, point to itself */
2789 skb
= validate_xmit_skb(skb
, dev
);
2797 /* If skb was segmented, skb->prev points to
2798 * the last segment. If not, it still contains skb.
2805 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2807 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2809 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2811 /* To get more precise estimation of bytes sent on wire,
2812 * we add to pkt_len the headers size of all segments
2814 if (shinfo
->gso_size
) {
2815 unsigned int hdr_len
;
2816 u16 gso_segs
= shinfo
->gso_segs
;
2818 /* mac layer + network layer */
2819 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2821 /* + transport layer */
2822 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2823 hdr_len
+= tcp_hdrlen(skb
);
2825 hdr_len
+= sizeof(struct udphdr
);
2827 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2828 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2831 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2835 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2836 struct net_device
*dev
,
2837 struct netdev_queue
*txq
)
2839 spinlock_t
*root_lock
= qdisc_lock(q
);
2843 qdisc_pkt_len_init(skb
);
2844 qdisc_calculate_pkt_len(skb
, q
);
2846 * Heuristic to force contended enqueues to serialize on a
2847 * separate lock before trying to get qdisc main lock.
2848 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2849 * often and dequeue packets faster.
2851 contended
= qdisc_is_running(q
);
2852 if (unlikely(contended
))
2853 spin_lock(&q
->busylock
);
2855 spin_lock(root_lock
);
2856 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2859 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2860 qdisc_run_begin(q
)) {
2862 * This is a work-conserving queue; there are no old skbs
2863 * waiting to be sent out; and the qdisc is not running -
2864 * xmit the skb directly.
2867 qdisc_bstats_update(q
, skb
);
2869 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
, true)) {
2870 if (unlikely(contended
)) {
2871 spin_unlock(&q
->busylock
);
2878 rc
= NET_XMIT_SUCCESS
;
2880 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2881 if (qdisc_run_begin(q
)) {
2882 if (unlikely(contended
)) {
2883 spin_unlock(&q
->busylock
);
2889 spin_unlock(root_lock
);
2890 if (unlikely(contended
))
2891 spin_unlock(&q
->busylock
);
2895 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2896 static void skb_update_prio(struct sk_buff
*skb
)
2898 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2900 if (!skb
->priority
&& skb
->sk
&& map
) {
2901 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2903 if (prioidx
< map
->priomap_len
)
2904 skb
->priority
= map
->priomap
[prioidx
];
2908 #define skb_update_prio(skb)
2911 DEFINE_PER_CPU(int, xmit_recursion
);
2912 EXPORT_SYMBOL(xmit_recursion
);
2914 #define RECURSION_LIMIT 10
2917 * dev_loopback_xmit - loop back @skb
2918 * @net: network namespace this loopback is happening in
2919 * @sk: sk needed to be a netfilter okfn
2920 * @skb: buffer to transmit
2922 int dev_loopback_xmit(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
2924 skb_reset_mac_header(skb
);
2925 __skb_pull(skb
, skb_network_offset(skb
));
2926 skb
->pkt_type
= PACKET_LOOPBACK
;
2927 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2928 WARN_ON(!skb_dst(skb
));
2933 EXPORT_SYMBOL(dev_loopback_xmit
);
2935 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
2938 struct xps_dev_maps
*dev_maps
;
2939 struct xps_map
*map
;
2940 int queue_index
= -1;
2943 dev_maps
= rcu_dereference(dev
->xps_maps
);
2945 map
= rcu_dereference(
2946 dev_maps
->cpu_map
[skb
->sender_cpu
- 1]);
2949 queue_index
= map
->queues
[0];
2951 queue_index
= map
->queues
[reciprocal_scale(skb_get_hash(skb
),
2953 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
2965 static u16
__netdev_pick_tx(struct net_device
*dev
, struct sk_buff
*skb
)
2967 struct sock
*sk
= skb
->sk
;
2968 int queue_index
= sk_tx_queue_get(sk
);
2970 if (queue_index
< 0 || skb
->ooo_okay
||
2971 queue_index
>= dev
->real_num_tx_queues
) {
2972 int new_index
= get_xps_queue(dev
, skb
);
2974 new_index
= skb_tx_hash(dev
, skb
);
2976 if (queue_index
!= new_index
&& sk
&&
2978 rcu_access_pointer(sk
->sk_dst_cache
))
2979 sk_tx_queue_set(sk
, new_index
);
2981 queue_index
= new_index
;
2987 struct netdev_queue
*netdev_pick_tx(struct net_device
*dev
,
2988 struct sk_buff
*skb
,
2991 int queue_index
= 0;
2994 if (skb
->sender_cpu
== 0)
2995 skb
->sender_cpu
= raw_smp_processor_id() + 1;
2998 if (dev
->real_num_tx_queues
!= 1) {
2999 const struct net_device_ops
*ops
= dev
->netdev_ops
;
3000 if (ops
->ndo_select_queue
)
3001 queue_index
= ops
->ndo_select_queue(dev
, skb
, accel_priv
,
3004 queue_index
= __netdev_pick_tx(dev
, skb
);
3007 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
3010 skb_set_queue_mapping(skb
, queue_index
);
3011 return netdev_get_tx_queue(dev
, queue_index
);
3015 * __dev_queue_xmit - transmit a buffer
3016 * @skb: buffer to transmit
3017 * @accel_priv: private data used for L2 forwarding offload
3019 * Queue a buffer for transmission to a network device. The caller must
3020 * have set the device and priority and built the buffer before calling
3021 * this function. The function can be called from an interrupt.
3023 * A negative errno code is returned on a failure. A success does not
3024 * guarantee the frame will be transmitted as it may be dropped due
3025 * to congestion or traffic shaping.
3027 * -----------------------------------------------------------------------------------
3028 * I notice this method can also return errors from the queue disciplines,
3029 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3032 * Regardless of the return value, the skb is consumed, so it is currently
3033 * difficult to retry a send to this method. (You can bump the ref count
3034 * before sending to hold a reference for retry if you are careful.)
3036 * When calling this method, interrupts MUST be enabled. This is because
3037 * the BH enable code must have IRQs enabled so that it will not deadlock.
3040 static int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
3042 struct net_device
*dev
= skb
->dev
;
3043 struct netdev_queue
*txq
;
3047 skb_reset_mac_header(skb
);
3049 if (unlikely(skb_shinfo(skb
)->tx_flags
& SKBTX_SCHED_TSTAMP
))
3050 __skb_tstamp_tx(skb
, NULL
, skb
->sk
, SCM_TSTAMP_SCHED
);
3052 /* Disable soft irqs for various locks below. Also
3053 * stops preemption for RCU.
3057 skb_update_prio(skb
);
3059 /* If device/qdisc don't need skb->dst, release it right now while
3060 * its hot in this cpu cache.
3062 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
3067 #ifdef CONFIG_NET_SWITCHDEV
3068 /* Don't forward if offload device already forwarded */
3069 if (skb
->offload_fwd_mark
&&
3070 skb
->offload_fwd_mark
== dev
->offload_fwd_mark
) {
3072 rc
= NET_XMIT_SUCCESS
;
3077 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
3078 q
= rcu_dereference_bh(txq
->qdisc
);
3080 #ifdef CONFIG_NET_CLS_ACT
3081 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
3083 trace_net_dev_queue(skb
);
3085 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
3089 /* The device has no queue. Common case for software devices:
3090 loopback, all the sorts of tunnels...
3092 Really, it is unlikely that netif_tx_lock protection is necessary
3093 here. (f.e. loopback and IP tunnels are clean ignoring statistics
3095 However, it is possible, that they rely on protection
3098 Check this and shot the lock. It is not prone from deadlocks.
3099 Either shot noqueue qdisc, it is even simpler 8)
3101 if (dev
->flags
& IFF_UP
) {
3102 int cpu
= smp_processor_id(); /* ok because BHs are off */
3104 if (txq
->xmit_lock_owner
!= cpu
) {
3106 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
3107 goto recursion_alert
;
3109 skb
= validate_xmit_skb(skb
, dev
);
3113 HARD_TX_LOCK(dev
, txq
, cpu
);
3115 if (!netif_xmit_stopped(txq
)) {
3116 __this_cpu_inc(xmit_recursion
);
3117 skb
= dev_hard_start_xmit(skb
, dev
, txq
, &rc
);
3118 __this_cpu_dec(xmit_recursion
);
3119 if (dev_xmit_complete(rc
)) {
3120 HARD_TX_UNLOCK(dev
, txq
);
3124 HARD_TX_UNLOCK(dev
, txq
);
3125 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3128 /* Recursion is detected! It is possible,
3132 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3139 rcu_read_unlock_bh();
3141 atomic_long_inc(&dev
->tx_dropped
);
3142 kfree_skb_list(skb
);
3145 rcu_read_unlock_bh();
3149 int dev_queue_xmit(struct sk_buff
*skb
)
3151 return __dev_queue_xmit(skb
, NULL
);
3153 EXPORT_SYMBOL(dev_queue_xmit
);
3155 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
3157 return __dev_queue_xmit(skb
, accel_priv
);
3159 EXPORT_SYMBOL(dev_queue_xmit_accel
);
3162 /*=======================================================================
3164 =======================================================================*/
3166 int netdev_max_backlog __read_mostly
= 1000;
3167 EXPORT_SYMBOL(netdev_max_backlog
);
3169 int netdev_tstamp_prequeue __read_mostly
= 1;
3170 int netdev_budget __read_mostly
= 300;
3171 int weight_p __read_mostly
= 64; /* old backlog weight */
3173 /* Called with irq disabled */
3174 static inline void ____napi_schedule(struct softnet_data
*sd
,
3175 struct napi_struct
*napi
)
3177 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
3178 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3183 /* One global table that all flow-based protocols share. */
3184 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
3185 EXPORT_SYMBOL(rps_sock_flow_table
);
3186 u32 rps_cpu_mask __read_mostly
;
3187 EXPORT_SYMBOL(rps_cpu_mask
);
3189 struct static_key rps_needed __read_mostly
;
3191 static struct rps_dev_flow
*
3192 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3193 struct rps_dev_flow
*rflow
, u16 next_cpu
)
3195 if (next_cpu
< nr_cpu_ids
) {
3196 #ifdef CONFIG_RFS_ACCEL
3197 struct netdev_rx_queue
*rxqueue
;
3198 struct rps_dev_flow_table
*flow_table
;
3199 struct rps_dev_flow
*old_rflow
;
3204 /* Should we steer this flow to a different hardware queue? */
3205 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
3206 !(dev
->features
& NETIF_F_NTUPLE
))
3208 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
3209 if (rxq_index
== skb_get_rx_queue(skb
))
3212 rxqueue
= dev
->_rx
+ rxq_index
;
3213 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3216 flow_id
= skb_get_hash(skb
) & flow_table
->mask
;
3217 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
3218 rxq_index
, flow_id
);
3222 rflow
= &flow_table
->flows
[flow_id
];
3224 if (old_rflow
->filter
== rflow
->filter
)
3225 old_rflow
->filter
= RPS_NO_FILTER
;
3229 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
3232 rflow
->cpu
= next_cpu
;
3237 * get_rps_cpu is called from netif_receive_skb and returns the target
3238 * CPU from the RPS map of the receiving queue for a given skb.
3239 * rcu_read_lock must be held on entry.
3241 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3242 struct rps_dev_flow
**rflowp
)
3244 const struct rps_sock_flow_table
*sock_flow_table
;
3245 struct netdev_rx_queue
*rxqueue
= dev
->_rx
;
3246 struct rps_dev_flow_table
*flow_table
;
3247 struct rps_map
*map
;
3252 if (skb_rx_queue_recorded(skb
)) {
3253 u16 index
= skb_get_rx_queue(skb
);
3255 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
3256 WARN_ONCE(dev
->real_num_rx_queues
> 1,
3257 "%s received packet on queue %u, but number "
3258 "of RX queues is %u\n",
3259 dev
->name
, index
, dev
->real_num_rx_queues
);
3265 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3267 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3268 map
= rcu_dereference(rxqueue
->rps_map
);
3269 if (!flow_table
&& !map
)
3272 skb_reset_network_header(skb
);
3273 hash
= skb_get_hash(skb
);
3277 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3278 if (flow_table
&& sock_flow_table
) {
3279 struct rps_dev_flow
*rflow
;
3283 /* First check into global flow table if there is a match */
3284 ident
= sock_flow_table
->ents
[hash
& sock_flow_table
->mask
];
3285 if ((ident
^ hash
) & ~rps_cpu_mask
)
3288 next_cpu
= ident
& rps_cpu_mask
;
3290 /* OK, now we know there is a match,
3291 * we can look at the local (per receive queue) flow table
3293 rflow
= &flow_table
->flows
[hash
& flow_table
->mask
];
3297 * If the desired CPU (where last recvmsg was done) is
3298 * different from current CPU (one in the rx-queue flow
3299 * table entry), switch if one of the following holds:
3300 * - Current CPU is unset (>= nr_cpu_ids).
3301 * - Current CPU is offline.
3302 * - The current CPU's queue tail has advanced beyond the
3303 * last packet that was enqueued using this table entry.
3304 * This guarantees that all previous packets for the flow
3305 * have been dequeued, thus preserving in order delivery.
3307 if (unlikely(tcpu
!= next_cpu
) &&
3308 (tcpu
>= nr_cpu_ids
|| !cpu_online(tcpu
) ||
3309 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3310 rflow
->last_qtail
)) >= 0)) {
3312 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3315 if (tcpu
< nr_cpu_ids
&& cpu_online(tcpu
)) {
3325 tcpu
= map
->cpus
[reciprocal_scale(hash
, map
->len
)];
3326 if (cpu_online(tcpu
)) {
3336 #ifdef CONFIG_RFS_ACCEL
3339 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3340 * @dev: Device on which the filter was set
3341 * @rxq_index: RX queue index
3342 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3343 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3345 * Drivers that implement ndo_rx_flow_steer() should periodically call
3346 * this function for each installed filter and remove the filters for
3347 * which it returns %true.
3349 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3350 u32 flow_id
, u16 filter_id
)
3352 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3353 struct rps_dev_flow_table
*flow_table
;
3354 struct rps_dev_flow
*rflow
;
3359 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3360 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3361 rflow
= &flow_table
->flows
[flow_id
];
3362 cpu
= ACCESS_ONCE(rflow
->cpu
);
3363 if (rflow
->filter
== filter_id
&& cpu
< nr_cpu_ids
&&
3364 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3365 rflow
->last_qtail
) <
3366 (int)(10 * flow_table
->mask
)))
3372 EXPORT_SYMBOL(rps_may_expire_flow
);
3374 #endif /* CONFIG_RFS_ACCEL */
3376 /* Called from hardirq (IPI) context */
3377 static void rps_trigger_softirq(void *data
)
3379 struct softnet_data
*sd
= data
;
3381 ____napi_schedule(sd
, &sd
->backlog
);
3385 #endif /* CONFIG_RPS */
3388 * Check if this softnet_data structure is another cpu one
3389 * If yes, queue it to our IPI list and return 1
3392 static int rps_ipi_queued(struct softnet_data
*sd
)
3395 struct softnet_data
*mysd
= this_cpu_ptr(&softnet_data
);
3398 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3399 mysd
->rps_ipi_list
= sd
;
3401 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3404 #endif /* CONFIG_RPS */
3408 #ifdef CONFIG_NET_FLOW_LIMIT
3409 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3412 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3414 #ifdef CONFIG_NET_FLOW_LIMIT
3415 struct sd_flow_limit
*fl
;
3416 struct softnet_data
*sd
;
3417 unsigned int old_flow
, new_flow
;
3419 if (qlen
< (netdev_max_backlog
>> 1))
3422 sd
= this_cpu_ptr(&softnet_data
);
3425 fl
= rcu_dereference(sd
->flow_limit
);
3427 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3428 old_flow
= fl
->history
[fl
->history_head
];
3429 fl
->history
[fl
->history_head
] = new_flow
;
3432 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3434 if (likely(fl
->buckets
[old_flow
]))
3435 fl
->buckets
[old_flow
]--;
3437 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3449 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3450 * queue (may be a remote CPU queue).
3452 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3453 unsigned int *qtail
)
3455 struct softnet_data
*sd
;
3456 unsigned long flags
;
3459 sd
= &per_cpu(softnet_data
, cpu
);
3461 local_irq_save(flags
);
3464 if (!netif_running(skb
->dev
))
3466 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3467 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3470 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3471 input_queue_tail_incr_save(sd
, qtail
);
3473 local_irq_restore(flags
);
3474 return NET_RX_SUCCESS
;
3477 /* Schedule NAPI for backlog device
3478 * We can use non atomic operation since we own the queue lock
3480 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3481 if (!rps_ipi_queued(sd
))
3482 ____napi_schedule(sd
, &sd
->backlog
);
3491 local_irq_restore(flags
);
3493 atomic_long_inc(&skb
->dev
->rx_dropped
);
3498 static int netif_rx_internal(struct sk_buff
*skb
)
3502 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3504 trace_netif_rx(skb
);
3506 if (static_key_false(&rps_needed
)) {
3507 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3513 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3515 cpu
= smp_processor_id();
3517 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3525 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3532 * netif_rx - post buffer to the network code
3533 * @skb: buffer to post
3535 * This function receives a packet from a device driver and queues it for
3536 * the upper (protocol) levels to process. It always succeeds. The buffer
3537 * may be dropped during processing for congestion control or by the
3541 * NET_RX_SUCCESS (no congestion)
3542 * NET_RX_DROP (packet was dropped)
3546 int netif_rx(struct sk_buff
*skb
)
3548 trace_netif_rx_entry(skb
);
3550 return netif_rx_internal(skb
);
3552 EXPORT_SYMBOL(netif_rx
);
3554 int netif_rx_ni(struct sk_buff
*skb
)
3558 trace_netif_rx_ni_entry(skb
);
3561 err
= netif_rx_internal(skb
);
3562 if (local_softirq_pending())
3568 EXPORT_SYMBOL(netif_rx_ni
);
3570 static void net_tx_action(struct softirq_action
*h
)
3572 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
3574 if (sd
->completion_queue
) {
3575 struct sk_buff
*clist
;
3577 local_irq_disable();
3578 clist
= sd
->completion_queue
;
3579 sd
->completion_queue
= NULL
;
3583 struct sk_buff
*skb
= clist
;
3584 clist
= clist
->next
;
3586 WARN_ON(atomic_read(&skb
->users
));
3587 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
3588 trace_consume_skb(skb
);
3590 trace_kfree_skb(skb
, net_tx_action
);
3595 if (sd
->output_queue
) {
3598 local_irq_disable();
3599 head
= sd
->output_queue
;
3600 sd
->output_queue
= NULL
;
3601 sd
->output_queue_tailp
= &sd
->output_queue
;
3605 struct Qdisc
*q
= head
;
3606 spinlock_t
*root_lock
;
3608 head
= head
->next_sched
;
3610 root_lock
= qdisc_lock(q
);
3611 if (spin_trylock(root_lock
)) {
3612 smp_mb__before_atomic();
3613 clear_bit(__QDISC_STATE_SCHED
,
3616 spin_unlock(root_lock
);
3618 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3620 __netif_reschedule(q
);
3622 smp_mb__before_atomic();
3623 clear_bit(__QDISC_STATE_SCHED
,
3631 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3632 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3633 /* This hook is defined here for ATM LANE */
3634 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3635 unsigned char *addr
) __read_mostly
;
3636 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3639 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3640 struct packet_type
**pt_prev
,
3641 int *ret
, struct net_device
*orig_dev
)
3643 #ifdef CONFIG_NET_CLS_ACT
3644 struct tcf_proto
*cl
= rcu_dereference_bh(skb
->dev
->ingress_cl_list
);
3645 struct tcf_result cl_res
;
3647 /* If there's at least one ingress present somewhere (so
3648 * we get here via enabled static key), remaining devices
3649 * that are not configured with an ingress qdisc will bail
3655 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3659 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
3660 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3661 qdisc_bstats_cpu_update(cl
->q
, skb
);
3663 switch (tc_classify(skb
, cl
, &cl_res
, false)) {
3665 case TC_ACT_RECLASSIFY
:
3666 skb
->tc_index
= TC_H_MIN(cl_res
.classid
);
3669 qdisc_qstats_cpu_drop(cl
->q
);
3674 case TC_ACT_REDIRECT
:
3675 /* skb_mac_header check was done by cls/act_bpf, so
3676 * we can safely push the L2 header back before
3677 * redirecting to another netdev
3679 __skb_push(skb
, skb
->mac_len
);
3680 skb_do_redirect(skb
);
3685 #endif /* CONFIG_NET_CLS_ACT */
3690 * netdev_rx_handler_register - register receive handler
3691 * @dev: device to register a handler for
3692 * @rx_handler: receive handler to register
3693 * @rx_handler_data: data pointer that is used by rx handler
3695 * Register a receive handler for a device. This handler will then be
3696 * called from __netif_receive_skb. A negative errno code is returned
3699 * The caller must hold the rtnl_mutex.
3701 * For a general description of rx_handler, see enum rx_handler_result.
3703 int netdev_rx_handler_register(struct net_device
*dev
,
3704 rx_handler_func_t
*rx_handler
,
3705 void *rx_handler_data
)
3709 if (dev
->rx_handler
)
3712 /* Note: rx_handler_data must be set before rx_handler */
3713 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3714 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3718 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3721 * netdev_rx_handler_unregister - unregister receive handler
3722 * @dev: device to unregister a handler from
3724 * Unregister a receive handler from a device.
3726 * The caller must hold the rtnl_mutex.
3728 void netdev_rx_handler_unregister(struct net_device
*dev
)
3732 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3733 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3734 * section has a guarantee to see a non NULL rx_handler_data
3738 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3740 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3743 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3744 * the special handling of PFMEMALLOC skbs.
3746 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3748 switch (skb
->protocol
) {
3749 case htons(ETH_P_ARP
):
3750 case htons(ETH_P_IP
):
3751 case htons(ETH_P_IPV6
):
3752 case htons(ETH_P_8021Q
):
3753 case htons(ETH_P_8021AD
):
3760 static inline int nf_ingress(struct sk_buff
*skb
, struct packet_type
**pt_prev
,
3761 int *ret
, struct net_device
*orig_dev
)
3763 #ifdef CONFIG_NETFILTER_INGRESS
3764 if (nf_hook_ingress_active(skb
)) {
3766 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3770 return nf_hook_ingress(skb
);
3772 #endif /* CONFIG_NETFILTER_INGRESS */
3776 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3778 struct packet_type
*ptype
, *pt_prev
;
3779 rx_handler_func_t
*rx_handler
;
3780 struct net_device
*orig_dev
;
3781 bool deliver_exact
= false;
3782 int ret
= NET_RX_DROP
;
3785 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3787 trace_netif_receive_skb(skb
);
3789 orig_dev
= skb
->dev
;
3791 skb_reset_network_header(skb
);
3792 if (!skb_transport_header_was_set(skb
))
3793 skb_reset_transport_header(skb
);
3794 skb_reset_mac_len(skb
);
3799 skb
->skb_iif
= skb
->dev
->ifindex
;
3801 __this_cpu_inc(softnet_data
.processed
);
3803 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
3804 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
3805 skb
= skb_vlan_untag(skb
);
3810 #ifdef CONFIG_NET_CLS_ACT
3811 if (skb
->tc_verd
& TC_NCLS
) {
3812 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3820 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3822 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3826 list_for_each_entry_rcu(ptype
, &skb
->dev
->ptype_all
, list
) {
3828 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3833 #ifdef CONFIG_NET_INGRESS
3834 if (static_key_false(&ingress_needed
)) {
3835 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3839 if (nf_ingress(skb
, &pt_prev
, &ret
, orig_dev
) < 0)
3843 #ifdef CONFIG_NET_CLS_ACT
3847 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3850 if (skb_vlan_tag_present(skb
)) {
3852 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3855 if (vlan_do_receive(&skb
))
3857 else if (unlikely(!skb
))
3861 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3864 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3867 switch (rx_handler(&skb
)) {
3868 case RX_HANDLER_CONSUMED
:
3869 ret
= NET_RX_SUCCESS
;
3871 case RX_HANDLER_ANOTHER
:
3873 case RX_HANDLER_EXACT
:
3874 deliver_exact
= true;
3875 case RX_HANDLER_PASS
:
3882 if (unlikely(skb_vlan_tag_present(skb
))) {
3883 if (skb_vlan_tag_get_id(skb
))
3884 skb
->pkt_type
= PACKET_OTHERHOST
;
3885 /* Note: we might in the future use prio bits
3886 * and set skb->priority like in vlan_do_receive()
3887 * For the time being, just ignore Priority Code Point
3892 type
= skb
->protocol
;
3894 /* deliver only exact match when indicated */
3895 if (likely(!deliver_exact
)) {
3896 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3897 &ptype_base
[ntohs(type
) &
3901 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3902 &orig_dev
->ptype_specific
);
3904 if (unlikely(skb
->dev
!= orig_dev
)) {
3905 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
3906 &skb
->dev
->ptype_specific
);
3910 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3913 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3916 atomic_long_inc(&skb
->dev
->rx_dropped
);
3918 /* Jamal, now you will not able to escape explaining
3919 * me how you were going to use this. :-)
3928 static int __netif_receive_skb(struct sk_buff
*skb
)
3932 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3933 unsigned long pflags
= current
->flags
;
3936 * PFMEMALLOC skbs are special, they should
3937 * - be delivered to SOCK_MEMALLOC sockets only
3938 * - stay away from userspace
3939 * - have bounded memory usage
3941 * Use PF_MEMALLOC as this saves us from propagating the allocation
3942 * context down to all allocation sites.
3944 current
->flags
|= PF_MEMALLOC
;
3945 ret
= __netif_receive_skb_core(skb
, true);
3946 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3948 ret
= __netif_receive_skb_core(skb
, false);
3953 static int netif_receive_skb_internal(struct sk_buff
*skb
)
3957 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3959 if (skb_defer_rx_timestamp(skb
))
3960 return NET_RX_SUCCESS
;
3965 if (static_key_false(&rps_needed
)) {
3966 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3967 int cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3970 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3976 ret
= __netif_receive_skb(skb
);
3982 * netif_receive_skb - process receive buffer from network
3983 * @skb: buffer to process
3985 * netif_receive_skb() is the main receive data processing function.
3986 * It always succeeds. The buffer may be dropped during processing
3987 * for congestion control or by the protocol layers.
3989 * This function may only be called from softirq context and interrupts
3990 * should be enabled.
3992 * Return values (usually ignored):
3993 * NET_RX_SUCCESS: no congestion
3994 * NET_RX_DROP: packet was dropped
3996 int netif_receive_skb(struct sk_buff
*skb
)
3998 trace_netif_receive_skb_entry(skb
);
4000 return netif_receive_skb_internal(skb
);
4002 EXPORT_SYMBOL(netif_receive_skb
);
4004 /* Network device is going away, flush any packets still pending
4005 * Called with irqs disabled.
4007 static void flush_backlog(void *arg
)
4009 struct net_device
*dev
= arg
;
4010 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4011 struct sk_buff
*skb
, *tmp
;
4014 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
4015 if (skb
->dev
== dev
) {
4016 __skb_unlink(skb
, &sd
->input_pkt_queue
);
4018 input_queue_head_incr(sd
);
4023 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
4024 if (skb
->dev
== dev
) {
4025 __skb_unlink(skb
, &sd
->process_queue
);
4027 input_queue_head_incr(sd
);
4032 static int napi_gro_complete(struct sk_buff
*skb
)
4034 struct packet_offload
*ptype
;
4035 __be16 type
= skb
->protocol
;
4036 struct list_head
*head
= &offload_base
;
4039 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
4041 if (NAPI_GRO_CB(skb
)->count
== 1) {
4042 skb_shinfo(skb
)->gso_size
= 0;
4047 list_for_each_entry_rcu(ptype
, head
, list
) {
4048 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4051 err
= ptype
->callbacks
.gro_complete(skb
, 0);
4057 WARN_ON(&ptype
->list
== head
);
4059 return NET_RX_SUCCESS
;
4063 return netif_receive_skb_internal(skb
);
4066 /* napi->gro_list contains packets ordered by age.
4067 * youngest packets at the head of it.
4068 * Complete skbs in reverse order to reduce latencies.
4070 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
4072 struct sk_buff
*skb
, *prev
= NULL
;
4074 /* scan list and build reverse chain */
4075 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
4080 for (skb
= prev
; skb
; skb
= prev
) {
4083 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
4087 napi_gro_complete(skb
);
4091 napi
->gro_list
= NULL
;
4093 EXPORT_SYMBOL(napi_gro_flush
);
4095 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
4098 unsigned int maclen
= skb
->dev
->hard_header_len
;
4099 u32 hash
= skb_get_hash_raw(skb
);
4101 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
4102 unsigned long diffs
;
4104 NAPI_GRO_CB(p
)->flush
= 0;
4106 if (hash
!= skb_get_hash_raw(p
)) {
4107 NAPI_GRO_CB(p
)->same_flow
= 0;
4111 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
4112 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
4113 if (maclen
== ETH_HLEN
)
4114 diffs
|= compare_ether_header(skb_mac_header(p
),
4115 skb_mac_header(skb
));
4117 diffs
= memcmp(skb_mac_header(p
),
4118 skb_mac_header(skb
),
4120 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
4124 static void skb_gro_reset_offset(struct sk_buff
*skb
)
4126 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4127 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
4129 NAPI_GRO_CB(skb
)->data_offset
= 0;
4130 NAPI_GRO_CB(skb
)->frag0
= NULL
;
4131 NAPI_GRO_CB(skb
)->frag0_len
= 0;
4133 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
4135 !PageHighMem(skb_frag_page(frag0
))) {
4136 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
4137 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
4141 static void gro_pull_from_frag0(struct sk_buff
*skb
, int grow
)
4143 struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4145 BUG_ON(skb
->end
- skb
->tail
< grow
);
4147 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
4149 skb
->data_len
-= grow
;
4152 pinfo
->frags
[0].page_offset
+= grow
;
4153 skb_frag_size_sub(&pinfo
->frags
[0], grow
);
4155 if (unlikely(!skb_frag_size(&pinfo
->frags
[0]))) {
4156 skb_frag_unref(skb
, 0);
4157 memmove(pinfo
->frags
, pinfo
->frags
+ 1,
4158 --pinfo
->nr_frags
* sizeof(pinfo
->frags
[0]));
4162 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4164 struct sk_buff
**pp
= NULL
;
4165 struct packet_offload
*ptype
;
4166 __be16 type
= skb
->protocol
;
4167 struct list_head
*head
= &offload_base
;
4169 enum gro_result ret
;
4172 if (!(skb
->dev
->features
& NETIF_F_GRO
))
4175 if (skb_is_gso(skb
) || skb_has_frag_list(skb
) || skb
->csum_bad
)
4178 gro_list_prepare(napi
, skb
);
4181 list_for_each_entry_rcu(ptype
, head
, list
) {
4182 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4185 skb_set_network_header(skb
, skb_gro_offset(skb
));
4186 skb_reset_mac_len(skb
);
4187 NAPI_GRO_CB(skb
)->same_flow
= 0;
4188 NAPI_GRO_CB(skb
)->flush
= 0;
4189 NAPI_GRO_CB(skb
)->free
= 0;
4190 NAPI_GRO_CB(skb
)->udp_mark
= 0;
4191 NAPI_GRO_CB(skb
)->gro_remcsum_start
= 0;
4193 /* Setup for GRO checksum validation */
4194 switch (skb
->ip_summed
) {
4195 case CHECKSUM_COMPLETE
:
4196 NAPI_GRO_CB(skb
)->csum
= skb
->csum
;
4197 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4198 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4200 case CHECKSUM_UNNECESSARY
:
4201 NAPI_GRO_CB(skb
)->csum_cnt
= skb
->csum_level
+ 1;
4202 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4205 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4206 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4209 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
4214 if (&ptype
->list
== head
)
4217 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
4218 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
4221 struct sk_buff
*nskb
= *pp
;
4225 napi_gro_complete(nskb
);
4232 if (NAPI_GRO_CB(skb
)->flush
)
4235 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
4236 struct sk_buff
*nskb
= napi
->gro_list
;
4238 /* locate the end of the list to select the 'oldest' flow */
4239 while (nskb
->next
) {
4245 napi_gro_complete(nskb
);
4249 NAPI_GRO_CB(skb
)->count
= 1;
4250 NAPI_GRO_CB(skb
)->age
= jiffies
;
4251 NAPI_GRO_CB(skb
)->last
= skb
;
4252 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
4253 skb
->next
= napi
->gro_list
;
4254 napi
->gro_list
= skb
;
4258 grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
4260 gro_pull_from_frag0(skb
, grow
);
4269 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
4271 struct list_head
*offload_head
= &offload_base
;
4272 struct packet_offload
*ptype
;
4274 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4275 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4281 EXPORT_SYMBOL(gro_find_receive_by_type
);
4283 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
4285 struct list_head
*offload_head
= &offload_base
;
4286 struct packet_offload
*ptype
;
4288 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4289 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4295 EXPORT_SYMBOL(gro_find_complete_by_type
);
4297 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
4301 if (netif_receive_skb_internal(skb
))
4309 case GRO_MERGED_FREE
:
4310 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
4311 kmem_cache_free(skbuff_head_cache
, skb
);
4324 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4326 trace_napi_gro_receive_entry(skb
);
4328 skb_gro_reset_offset(skb
);
4330 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4332 EXPORT_SYMBOL(napi_gro_receive
);
4334 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4336 if (unlikely(skb
->pfmemalloc
)) {
4340 __skb_pull(skb
, skb_headlen(skb
));
4341 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4342 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
4344 skb
->dev
= napi
->dev
;
4346 skb
->encapsulation
= 0;
4347 skb_shinfo(skb
)->gso_type
= 0;
4348 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
4353 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
4355 struct sk_buff
*skb
= napi
->skb
;
4358 skb
= napi_alloc_skb(napi
, GRO_MAX_HEAD
);
4363 EXPORT_SYMBOL(napi_get_frags
);
4365 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
4366 struct sk_buff
*skb
,
4372 __skb_push(skb
, ETH_HLEN
);
4373 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4374 if (ret
== GRO_NORMAL
&& netif_receive_skb_internal(skb
))
4379 case GRO_MERGED_FREE
:
4380 napi_reuse_skb(napi
, skb
);
4390 /* Upper GRO stack assumes network header starts at gro_offset=0
4391 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4392 * We copy ethernet header into skb->data to have a common layout.
4394 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4396 struct sk_buff
*skb
= napi
->skb
;
4397 const struct ethhdr
*eth
;
4398 unsigned int hlen
= sizeof(*eth
);
4402 skb_reset_mac_header(skb
);
4403 skb_gro_reset_offset(skb
);
4405 eth
= skb_gro_header_fast(skb
, 0);
4406 if (unlikely(skb_gro_header_hard(skb
, hlen
))) {
4407 eth
= skb_gro_header_slow(skb
, hlen
, 0);
4408 if (unlikely(!eth
)) {
4409 napi_reuse_skb(napi
, skb
);
4413 gro_pull_from_frag0(skb
, hlen
);
4414 NAPI_GRO_CB(skb
)->frag0
+= hlen
;
4415 NAPI_GRO_CB(skb
)->frag0_len
-= hlen
;
4417 __skb_pull(skb
, hlen
);
4420 * This works because the only protocols we care about don't require
4422 * We'll fix it up properly in napi_frags_finish()
4424 skb
->protocol
= eth
->h_proto
;
4429 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4431 struct sk_buff
*skb
= napi_frags_skb(napi
);
4436 trace_napi_gro_frags_entry(skb
);
4438 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4440 EXPORT_SYMBOL(napi_gro_frags
);
4442 /* Compute the checksum from gro_offset and return the folded value
4443 * after adding in any pseudo checksum.
4445 __sum16
__skb_gro_checksum_complete(struct sk_buff
*skb
)
4450 wsum
= skb_checksum(skb
, skb_gro_offset(skb
), skb_gro_len(skb
), 0);
4452 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4453 sum
= csum_fold(csum_add(NAPI_GRO_CB(skb
)->csum
, wsum
));
4455 if (unlikely(skb
->ip_summed
== CHECKSUM_COMPLETE
) &&
4456 !skb
->csum_complete_sw
)
4457 netdev_rx_csum_fault(skb
->dev
);
4460 NAPI_GRO_CB(skb
)->csum
= wsum
;
4461 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4465 EXPORT_SYMBOL(__skb_gro_checksum_complete
);
4468 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4469 * Note: called with local irq disabled, but exits with local irq enabled.
4471 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4474 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4477 sd
->rps_ipi_list
= NULL
;
4481 /* Send pending IPI's to kick RPS processing on remote cpus. */
4483 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4485 if (cpu_online(remsd
->cpu
))
4486 smp_call_function_single_async(remsd
->cpu
,
4495 static bool sd_has_rps_ipi_waiting(struct softnet_data
*sd
)
4498 return sd
->rps_ipi_list
!= NULL
;
4504 static int process_backlog(struct napi_struct
*napi
, int quota
)
4507 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4509 /* Check if we have pending ipi, its better to send them now,
4510 * not waiting net_rx_action() end.
4512 if (sd_has_rps_ipi_waiting(sd
)) {
4513 local_irq_disable();
4514 net_rps_action_and_irq_enable(sd
);
4517 napi
->weight
= weight_p
;
4518 local_irq_disable();
4520 struct sk_buff
*skb
;
4522 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4525 __netif_receive_skb(skb
);
4527 local_irq_disable();
4528 input_queue_head_incr(sd
);
4529 if (++work
>= quota
) {
4536 if (skb_queue_empty(&sd
->input_pkt_queue
)) {
4538 * Inline a custom version of __napi_complete().
4539 * only current cpu owns and manipulates this napi,
4540 * and NAPI_STATE_SCHED is the only possible flag set
4542 * We can use a plain write instead of clear_bit(),
4543 * and we dont need an smp_mb() memory barrier.
4551 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4552 &sd
->process_queue
);
4561 * __napi_schedule - schedule for receive
4562 * @n: entry to schedule
4564 * The entry's receive function will be scheduled to run.
4565 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4567 void __napi_schedule(struct napi_struct
*n
)
4569 unsigned long flags
;
4571 local_irq_save(flags
);
4572 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4573 local_irq_restore(flags
);
4575 EXPORT_SYMBOL(__napi_schedule
);
4578 * __napi_schedule_irqoff - schedule for receive
4579 * @n: entry to schedule
4581 * Variant of __napi_schedule() assuming hard irqs are masked
4583 void __napi_schedule_irqoff(struct napi_struct
*n
)
4585 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4587 EXPORT_SYMBOL(__napi_schedule_irqoff
);
4589 void __napi_complete(struct napi_struct
*n
)
4591 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4593 list_del_init(&n
->poll_list
);
4594 smp_mb__before_atomic();
4595 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4597 EXPORT_SYMBOL(__napi_complete
);
4599 void napi_complete_done(struct napi_struct
*n
, int work_done
)
4601 unsigned long flags
;
4604 * don't let napi dequeue from the cpu poll list
4605 * just in case its running on a different cpu
4607 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4611 unsigned long timeout
= 0;
4614 timeout
= n
->dev
->gro_flush_timeout
;
4617 hrtimer_start(&n
->timer
, ns_to_ktime(timeout
),
4618 HRTIMER_MODE_REL_PINNED
);
4620 napi_gro_flush(n
, false);
4622 if (likely(list_empty(&n
->poll_list
))) {
4623 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED
, &n
->state
));
4625 /* If n->poll_list is not empty, we need to mask irqs */
4626 local_irq_save(flags
);
4628 local_irq_restore(flags
);
4631 EXPORT_SYMBOL(napi_complete_done
);
4633 /* must be called under rcu_read_lock(), as we dont take a reference */
4634 struct napi_struct
*napi_by_id(unsigned int napi_id
)
4636 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4637 struct napi_struct
*napi
;
4639 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4640 if (napi
->napi_id
== napi_id
)
4645 EXPORT_SYMBOL_GPL(napi_by_id
);
4647 void napi_hash_add(struct napi_struct
*napi
)
4649 if (!test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
4651 spin_lock(&napi_hash_lock
);
4653 /* 0 is not a valid id, we also skip an id that is taken
4654 * we expect both events to be extremely rare
4657 while (!napi
->napi_id
) {
4658 napi
->napi_id
= ++napi_gen_id
;
4659 if (napi_by_id(napi
->napi_id
))
4663 hlist_add_head_rcu(&napi
->napi_hash_node
,
4664 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
4666 spin_unlock(&napi_hash_lock
);
4669 EXPORT_SYMBOL_GPL(napi_hash_add
);
4671 /* Warning : caller is responsible to make sure rcu grace period
4672 * is respected before freeing memory containing @napi
4674 void napi_hash_del(struct napi_struct
*napi
)
4676 spin_lock(&napi_hash_lock
);
4678 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
))
4679 hlist_del_rcu(&napi
->napi_hash_node
);
4681 spin_unlock(&napi_hash_lock
);
4683 EXPORT_SYMBOL_GPL(napi_hash_del
);
4685 static enum hrtimer_restart
napi_watchdog(struct hrtimer
*timer
)
4687 struct napi_struct
*napi
;
4689 napi
= container_of(timer
, struct napi_struct
, timer
);
4691 napi_schedule(napi
);
4693 return HRTIMER_NORESTART
;
4696 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4697 int (*poll
)(struct napi_struct
*, int), int weight
)
4699 INIT_LIST_HEAD(&napi
->poll_list
);
4700 hrtimer_init(&napi
->timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_REL_PINNED
);
4701 napi
->timer
.function
= napi_watchdog
;
4702 napi
->gro_count
= 0;
4703 napi
->gro_list
= NULL
;
4706 if (weight
> NAPI_POLL_WEIGHT
)
4707 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4709 napi
->weight
= weight
;
4710 list_add(&napi
->dev_list
, &dev
->napi_list
);
4712 #ifdef CONFIG_NETPOLL
4713 spin_lock_init(&napi
->poll_lock
);
4714 napi
->poll_owner
= -1;
4716 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4718 EXPORT_SYMBOL(netif_napi_add
);
4720 void napi_disable(struct napi_struct
*n
)
4723 set_bit(NAPI_STATE_DISABLE
, &n
->state
);
4725 while (test_and_set_bit(NAPI_STATE_SCHED
, &n
->state
))
4727 while (test_and_set_bit(NAPI_STATE_NPSVC
, &n
->state
))
4730 hrtimer_cancel(&n
->timer
);
4732 clear_bit(NAPI_STATE_DISABLE
, &n
->state
);
4734 EXPORT_SYMBOL(napi_disable
);
4736 void netif_napi_del(struct napi_struct
*napi
)
4738 list_del_init(&napi
->dev_list
);
4739 napi_free_frags(napi
);
4741 kfree_skb_list(napi
->gro_list
);
4742 napi
->gro_list
= NULL
;
4743 napi
->gro_count
= 0;
4745 EXPORT_SYMBOL(netif_napi_del
);
4747 static int napi_poll(struct napi_struct
*n
, struct list_head
*repoll
)
4752 list_del_init(&n
->poll_list
);
4754 have
= netpoll_poll_lock(n
);
4758 /* This NAPI_STATE_SCHED test is for avoiding a race
4759 * with netpoll's poll_napi(). Only the entity which
4760 * obtains the lock and sees NAPI_STATE_SCHED set will
4761 * actually make the ->poll() call. Therefore we avoid
4762 * accidentally calling ->poll() when NAPI is not scheduled.
4765 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4766 work
= n
->poll(n
, weight
);
4770 WARN_ON_ONCE(work
> weight
);
4772 if (likely(work
< weight
))
4775 /* Drivers must not modify the NAPI state if they
4776 * consume the entire weight. In such cases this code
4777 * still "owns" the NAPI instance and therefore can
4778 * move the instance around on the list at-will.
4780 if (unlikely(napi_disable_pending(n
))) {
4786 /* flush too old packets
4787 * If HZ < 1000, flush all packets.
4789 napi_gro_flush(n
, HZ
>= 1000);
4792 /* Some drivers may have called napi_schedule
4793 * prior to exhausting their budget.
4795 if (unlikely(!list_empty(&n
->poll_list
))) {
4796 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
4797 n
->dev
? n
->dev
->name
: "backlog");
4801 list_add_tail(&n
->poll_list
, repoll
);
4804 netpoll_poll_unlock(have
);
4809 static void net_rx_action(struct softirq_action
*h
)
4811 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4812 unsigned long time_limit
= jiffies
+ 2;
4813 int budget
= netdev_budget
;
4817 local_irq_disable();
4818 list_splice_init(&sd
->poll_list
, &list
);
4822 struct napi_struct
*n
;
4824 if (list_empty(&list
)) {
4825 if (!sd_has_rps_ipi_waiting(sd
) && list_empty(&repoll
))
4830 n
= list_first_entry(&list
, struct napi_struct
, poll_list
);
4831 budget
-= napi_poll(n
, &repoll
);
4833 /* If softirq window is exhausted then punt.
4834 * Allow this to run for 2 jiffies since which will allow
4835 * an average latency of 1.5/HZ.
4837 if (unlikely(budget
<= 0 ||
4838 time_after_eq(jiffies
, time_limit
))) {
4844 local_irq_disable();
4846 list_splice_tail_init(&sd
->poll_list
, &list
);
4847 list_splice_tail(&repoll
, &list
);
4848 list_splice(&list
, &sd
->poll_list
);
4849 if (!list_empty(&sd
->poll_list
))
4850 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4852 net_rps_action_and_irq_enable(sd
);
4855 struct netdev_adjacent
{
4856 struct net_device
*dev
;
4858 /* upper master flag, there can only be one master device per list */
4861 /* counter for the number of times this device was added to us */
4864 /* private field for the users */
4867 struct list_head list
;
4868 struct rcu_head rcu
;
4871 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*adj_dev
,
4872 struct list_head
*adj_list
)
4874 struct netdev_adjacent
*adj
;
4876 list_for_each_entry(adj
, adj_list
, list
) {
4877 if (adj
->dev
== adj_dev
)
4884 * netdev_has_upper_dev - Check if device is linked to an upper device
4886 * @upper_dev: upper device to check
4888 * Find out if a device is linked to specified upper device and return true
4889 * in case it is. Note that this checks only immediate upper device,
4890 * not through a complete stack of devices. The caller must hold the RTNL lock.
4892 bool netdev_has_upper_dev(struct net_device
*dev
,
4893 struct net_device
*upper_dev
)
4897 return __netdev_find_adj(upper_dev
, &dev
->all_adj_list
.upper
);
4899 EXPORT_SYMBOL(netdev_has_upper_dev
);
4902 * netdev_has_any_upper_dev - Check if device is linked to some device
4905 * Find out if a device is linked to an upper device and return true in case
4906 * it is. The caller must hold the RTNL lock.
4908 static bool netdev_has_any_upper_dev(struct net_device
*dev
)
4912 return !list_empty(&dev
->all_adj_list
.upper
);
4916 * netdev_master_upper_dev_get - Get master upper device
4919 * Find a master upper device and return pointer to it or NULL in case
4920 * it's not there. The caller must hold the RTNL lock.
4922 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4924 struct netdev_adjacent
*upper
;
4928 if (list_empty(&dev
->adj_list
.upper
))
4931 upper
= list_first_entry(&dev
->adj_list
.upper
,
4932 struct netdev_adjacent
, list
);
4933 if (likely(upper
->master
))
4937 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4939 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
4941 struct netdev_adjacent
*adj
;
4943 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
4945 return adj
->private;
4947 EXPORT_SYMBOL(netdev_adjacent_get_private
);
4950 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
4952 * @iter: list_head ** of the current position
4954 * Gets the next device from the dev's upper list, starting from iter
4955 * position. The caller must hold RCU read lock.
4957 struct net_device
*netdev_upper_get_next_dev_rcu(struct net_device
*dev
,
4958 struct list_head
**iter
)
4960 struct netdev_adjacent
*upper
;
4962 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4964 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4966 if (&upper
->list
== &dev
->adj_list
.upper
)
4969 *iter
= &upper
->list
;
4973 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu
);
4976 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4978 * @iter: list_head ** of the current position
4980 * Gets the next device from the dev's upper list, starting from iter
4981 * position. The caller must hold RCU read lock.
4983 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
4984 struct list_head
**iter
)
4986 struct netdev_adjacent
*upper
;
4988 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4990 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4992 if (&upper
->list
== &dev
->all_adj_list
.upper
)
4995 *iter
= &upper
->list
;
4999 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
5002 * netdev_lower_get_next_private - Get the next ->private from the
5003 * lower neighbour list
5005 * @iter: list_head ** of the current position
5007 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5008 * list, starting from iter position. The caller must hold either hold the
5009 * RTNL lock or its own locking that guarantees that the neighbour lower
5010 * list will remain unchanged.
5012 void *netdev_lower_get_next_private(struct net_device
*dev
,
5013 struct list_head
**iter
)
5015 struct netdev_adjacent
*lower
;
5017 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
5019 if (&lower
->list
== &dev
->adj_list
.lower
)
5022 *iter
= lower
->list
.next
;
5024 return lower
->private;
5026 EXPORT_SYMBOL(netdev_lower_get_next_private
);
5029 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5030 * lower neighbour list, RCU
5033 * @iter: list_head ** of the current position
5035 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5036 * list, starting from iter position. The caller must hold RCU read lock.
5038 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
5039 struct list_head
**iter
)
5041 struct netdev_adjacent
*lower
;
5043 WARN_ON_ONCE(!rcu_read_lock_held());
5045 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5047 if (&lower
->list
== &dev
->adj_list
.lower
)
5050 *iter
= &lower
->list
;
5052 return lower
->private;
5054 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
5057 * netdev_lower_get_next - Get the next device from the lower neighbour
5060 * @iter: list_head ** of the current position
5062 * Gets the next netdev_adjacent from the dev's lower neighbour
5063 * list, starting from iter position. The caller must hold RTNL lock or
5064 * its own locking that guarantees that the neighbour lower
5065 * list will remain unchanged.
5067 void *netdev_lower_get_next(struct net_device
*dev
, struct list_head
**iter
)
5069 struct netdev_adjacent
*lower
;
5071 lower
= list_entry((*iter
)->next
, struct netdev_adjacent
, list
);
5073 if (&lower
->list
== &dev
->adj_list
.lower
)
5076 *iter
= &lower
->list
;
5080 EXPORT_SYMBOL(netdev_lower_get_next
);
5083 * netdev_lower_get_first_private_rcu - Get the first ->private from the
5084 * lower neighbour list, RCU
5088 * Gets the first netdev_adjacent->private from the dev's lower neighbour
5089 * list. The caller must hold RCU read lock.
5091 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
5093 struct netdev_adjacent
*lower
;
5095 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
5096 struct netdev_adjacent
, list
);
5098 return lower
->private;
5101 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
5104 * netdev_master_upper_dev_get_rcu - Get master upper device
5107 * Find a master upper device and return pointer to it or NULL in case
5108 * it's not there. The caller must hold the RCU read lock.
5110 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
5112 struct netdev_adjacent
*upper
;
5114 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
5115 struct netdev_adjacent
, list
);
5116 if (upper
&& likely(upper
->master
))
5120 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
5122 static int netdev_adjacent_sysfs_add(struct net_device
*dev
,
5123 struct net_device
*adj_dev
,
5124 struct list_head
*dev_list
)
5126 char linkname
[IFNAMSIZ
+7];
5127 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
5128 "upper_%s" : "lower_%s", adj_dev
->name
);
5129 return sysfs_create_link(&(dev
->dev
.kobj
), &(adj_dev
->dev
.kobj
),
5132 static void netdev_adjacent_sysfs_del(struct net_device
*dev
,
5134 struct list_head
*dev_list
)
5136 char linkname
[IFNAMSIZ
+7];
5137 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
5138 "upper_%s" : "lower_%s", name
);
5139 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
5142 static inline bool netdev_adjacent_is_neigh_list(struct net_device
*dev
,
5143 struct net_device
*adj_dev
,
5144 struct list_head
*dev_list
)
5146 return (dev_list
== &dev
->adj_list
.upper
||
5147 dev_list
== &dev
->adj_list
.lower
) &&
5148 net_eq(dev_net(dev
), dev_net(adj_dev
));
5151 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
5152 struct net_device
*adj_dev
,
5153 struct list_head
*dev_list
,
5154 void *private, bool master
)
5156 struct netdev_adjacent
*adj
;
5159 adj
= __netdev_find_adj(adj_dev
, dev_list
);
5166 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
5171 adj
->master
= master
;
5173 adj
->private = private;
5176 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5177 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5179 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
)) {
5180 ret
= netdev_adjacent_sysfs_add(dev
, adj_dev
, dev_list
);
5185 /* Ensure that master link is always the first item in list. */
5187 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
5188 &(adj_dev
->dev
.kobj
), "master");
5190 goto remove_symlinks
;
5192 list_add_rcu(&adj
->list
, dev_list
);
5194 list_add_tail_rcu(&adj
->list
, dev_list
);
5200 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5201 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5209 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
5210 struct net_device
*adj_dev
,
5211 struct list_head
*dev_list
)
5213 struct netdev_adjacent
*adj
;
5215 adj
= __netdev_find_adj(adj_dev
, dev_list
);
5218 pr_err("tried to remove device %s from %s\n",
5219 dev
->name
, adj_dev
->name
);
5223 if (adj
->ref_nr
> 1) {
5224 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
5231 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
5233 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5234 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5236 list_del_rcu(&adj
->list
);
5237 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5238 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5240 kfree_rcu(adj
, rcu
);
5243 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
5244 struct net_device
*upper_dev
,
5245 struct list_head
*up_list
,
5246 struct list_head
*down_list
,
5247 void *private, bool master
)
5251 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
5256 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
5259 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5266 static int __netdev_adjacent_dev_link(struct net_device
*dev
,
5267 struct net_device
*upper_dev
)
5269 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5270 &dev
->all_adj_list
.upper
,
5271 &upper_dev
->all_adj_list
.lower
,
5275 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
5276 struct net_device
*upper_dev
,
5277 struct list_head
*up_list
,
5278 struct list_head
*down_list
)
5280 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5281 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
5284 static void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
5285 struct net_device
*upper_dev
)
5287 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5288 &dev
->all_adj_list
.upper
,
5289 &upper_dev
->all_adj_list
.lower
);
5292 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
5293 struct net_device
*upper_dev
,
5294 void *private, bool master
)
5296 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
5301 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5302 &dev
->adj_list
.upper
,
5303 &upper_dev
->adj_list
.lower
,
5306 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5313 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
5314 struct net_device
*upper_dev
)
5316 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5317 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5318 &dev
->adj_list
.upper
,
5319 &upper_dev
->adj_list
.lower
);
5322 static int __netdev_upper_dev_link(struct net_device
*dev
,
5323 struct net_device
*upper_dev
, bool master
,
5326 struct netdev_notifier_changeupper_info changeupper_info
;
5327 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
5332 if (dev
== upper_dev
)
5335 /* To prevent loops, check if dev is not upper device to upper_dev. */
5336 if (__netdev_find_adj(dev
, &upper_dev
->all_adj_list
.upper
))
5339 if (__netdev_find_adj(upper_dev
, &dev
->adj_list
.upper
))
5342 if (master
&& netdev_master_upper_dev_get(dev
))
5345 changeupper_info
.upper_dev
= upper_dev
;
5346 changeupper_info
.master
= master
;
5347 changeupper_info
.linking
= true;
5349 ret
= call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER
, dev
,
5350 &changeupper_info
.info
);
5351 ret
= notifier_to_errno(ret
);
5355 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, private,
5360 /* Now that we linked these devs, make all the upper_dev's
5361 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5362 * versa, and don't forget the devices itself. All of these
5363 * links are non-neighbours.
5365 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5366 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5367 pr_debug("Interlinking %s with %s, non-neighbour\n",
5368 i
->dev
->name
, j
->dev
->name
);
5369 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
5375 /* add dev to every upper_dev's upper device */
5376 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5377 pr_debug("linking %s's upper device %s with %s\n",
5378 upper_dev
->name
, i
->dev
->name
, dev
->name
);
5379 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
5381 goto rollback_upper_mesh
;
5384 /* add upper_dev to every dev's lower device */
5385 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5386 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
5387 i
->dev
->name
, upper_dev
->name
);
5388 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
5390 goto rollback_lower_mesh
;
5393 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
, dev
,
5394 &changeupper_info
.info
);
5397 rollback_lower_mesh
:
5399 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5402 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5407 rollback_upper_mesh
:
5409 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5412 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5420 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5421 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5422 if (i
== to_i
&& j
== to_j
)
5424 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5430 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5436 * netdev_upper_dev_link - Add a link to the upper device
5438 * @upper_dev: new upper device
5440 * Adds a link to device which is upper to this one. The caller must hold
5441 * the RTNL lock. On a failure a negative errno code is returned.
5442 * On success the reference counts are adjusted and the function
5445 int netdev_upper_dev_link(struct net_device
*dev
,
5446 struct net_device
*upper_dev
)
5448 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
);
5450 EXPORT_SYMBOL(netdev_upper_dev_link
);
5453 * netdev_master_upper_dev_link - Add a master link to the upper device
5455 * @upper_dev: new upper device
5457 * Adds a link to device which is upper to this one. In this case, only
5458 * one master upper device can be linked, although other non-master devices
5459 * might be linked as well. The caller must hold the RTNL lock.
5460 * On a failure a negative errno code is returned. On success the reference
5461 * counts are adjusted and the function returns zero.
5463 int netdev_master_upper_dev_link(struct net_device
*dev
,
5464 struct net_device
*upper_dev
)
5466 return __netdev_upper_dev_link(dev
, upper_dev
, true, NULL
);
5468 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
5470 int netdev_master_upper_dev_link_private(struct net_device
*dev
,
5471 struct net_device
*upper_dev
,
5474 return __netdev_upper_dev_link(dev
, upper_dev
, true, private);
5476 EXPORT_SYMBOL(netdev_master_upper_dev_link_private
);
5479 * netdev_upper_dev_unlink - Removes a link to upper device
5481 * @upper_dev: new upper device
5483 * Removes a link to device which is upper to this one. The caller must hold
5486 void netdev_upper_dev_unlink(struct net_device
*dev
,
5487 struct net_device
*upper_dev
)
5489 struct netdev_notifier_changeupper_info changeupper_info
;
5490 struct netdev_adjacent
*i
, *j
;
5493 changeupper_info
.upper_dev
= upper_dev
;
5494 changeupper_info
.master
= netdev_master_upper_dev_get(dev
) == upper_dev
;
5495 changeupper_info
.linking
= false;
5497 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER
, dev
,
5498 &changeupper_info
.info
);
5500 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5502 /* Here is the tricky part. We must remove all dev's lower
5503 * devices from all upper_dev's upper devices and vice
5504 * versa, to maintain the graph relationship.
5506 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5507 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
5508 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5510 /* remove also the devices itself from lower/upper device
5513 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5514 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5516 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
5517 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5519 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
, dev
,
5520 &changeupper_info
.info
);
5522 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
5525 * netdev_bonding_info_change - Dispatch event about slave change
5527 * @bonding_info: info to dispatch
5529 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5530 * The caller must hold the RTNL lock.
5532 void netdev_bonding_info_change(struct net_device
*dev
,
5533 struct netdev_bonding_info
*bonding_info
)
5535 struct netdev_notifier_bonding_info info
;
5537 memcpy(&info
.bonding_info
, bonding_info
,
5538 sizeof(struct netdev_bonding_info
));
5539 call_netdevice_notifiers_info(NETDEV_BONDING_INFO
, dev
,
5542 EXPORT_SYMBOL(netdev_bonding_info_change
);
5544 static void netdev_adjacent_add_links(struct net_device
*dev
)
5546 struct netdev_adjacent
*iter
;
5548 struct net
*net
= dev_net(dev
);
5550 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5551 if (!net_eq(net
,dev_net(iter
->dev
)))
5553 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5554 &iter
->dev
->adj_list
.lower
);
5555 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5556 &dev
->adj_list
.upper
);
5559 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5560 if (!net_eq(net
,dev_net(iter
->dev
)))
5562 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5563 &iter
->dev
->adj_list
.upper
);
5564 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5565 &dev
->adj_list
.lower
);
5569 static void netdev_adjacent_del_links(struct net_device
*dev
)
5571 struct netdev_adjacent
*iter
;
5573 struct net
*net
= dev_net(dev
);
5575 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5576 if (!net_eq(net
,dev_net(iter
->dev
)))
5578 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5579 &iter
->dev
->adj_list
.lower
);
5580 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5581 &dev
->adj_list
.upper
);
5584 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5585 if (!net_eq(net
,dev_net(iter
->dev
)))
5587 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5588 &iter
->dev
->adj_list
.upper
);
5589 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5590 &dev
->adj_list
.lower
);
5594 void netdev_adjacent_rename_links(struct net_device
*dev
, char *oldname
)
5596 struct netdev_adjacent
*iter
;
5598 struct net
*net
= dev_net(dev
);
5600 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5601 if (!net_eq(net
,dev_net(iter
->dev
)))
5603 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5604 &iter
->dev
->adj_list
.lower
);
5605 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5606 &iter
->dev
->adj_list
.lower
);
5609 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5610 if (!net_eq(net
,dev_net(iter
->dev
)))
5612 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5613 &iter
->dev
->adj_list
.upper
);
5614 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5615 &iter
->dev
->adj_list
.upper
);
5619 void *netdev_lower_dev_get_private(struct net_device
*dev
,
5620 struct net_device
*lower_dev
)
5622 struct netdev_adjacent
*lower
;
5626 lower
= __netdev_find_adj(lower_dev
, &dev
->adj_list
.lower
);
5630 return lower
->private;
5632 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
5635 int dev_get_nest_level(struct net_device
*dev
,
5636 bool (*type_check
)(struct net_device
*dev
))
5638 struct net_device
*lower
= NULL
;
5639 struct list_head
*iter
;
5645 netdev_for_each_lower_dev(dev
, lower
, iter
) {
5646 nest
= dev_get_nest_level(lower
, type_check
);
5647 if (max_nest
< nest
)
5651 if (type_check(dev
))
5656 EXPORT_SYMBOL(dev_get_nest_level
);
5658 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
5660 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5662 if (ops
->ndo_change_rx_flags
)
5663 ops
->ndo_change_rx_flags(dev
, flags
);
5666 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
5668 unsigned int old_flags
= dev
->flags
;
5674 dev
->flags
|= IFF_PROMISC
;
5675 dev
->promiscuity
+= inc
;
5676 if (dev
->promiscuity
== 0) {
5679 * If inc causes overflow, untouch promisc and return error.
5682 dev
->flags
&= ~IFF_PROMISC
;
5684 dev
->promiscuity
-= inc
;
5685 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5690 if (dev
->flags
!= old_flags
) {
5691 pr_info("device %s %s promiscuous mode\n",
5693 dev
->flags
& IFF_PROMISC
? "entered" : "left");
5694 if (audit_enabled
) {
5695 current_uid_gid(&uid
, &gid
);
5696 audit_log(current
->audit_context
, GFP_ATOMIC
,
5697 AUDIT_ANOM_PROMISCUOUS
,
5698 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5699 dev
->name
, (dev
->flags
& IFF_PROMISC
),
5700 (old_flags
& IFF_PROMISC
),
5701 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
5702 from_kuid(&init_user_ns
, uid
),
5703 from_kgid(&init_user_ns
, gid
),
5704 audit_get_sessionid(current
));
5707 dev_change_rx_flags(dev
, IFF_PROMISC
);
5710 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
5715 * dev_set_promiscuity - update promiscuity count on a device
5719 * Add or remove promiscuity from a device. While the count in the device
5720 * remains above zero the interface remains promiscuous. Once it hits zero
5721 * the device reverts back to normal filtering operation. A negative inc
5722 * value is used to drop promiscuity on the device.
5723 * Return 0 if successful or a negative errno code on error.
5725 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
5727 unsigned int old_flags
= dev
->flags
;
5730 err
= __dev_set_promiscuity(dev
, inc
, true);
5733 if (dev
->flags
!= old_flags
)
5734 dev_set_rx_mode(dev
);
5737 EXPORT_SYMBOL(dev_set_promiscuity
);
5739 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
5741 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5745 dev
->flags
|= IFF_ALLMULTI
;
5746 dev
->allmulti
+= inc
;
5747 if (dev
->allmulti
== 0) {
5750 * If inc causes overflow, untouch allmulti and return error.
5753 dev
->flags
&= ~IFF_ALLMULTI
;
5755 dev
->allmulti
-= inc
;
5756 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5761 if (dev
->flags
^ old_flags
) {
5762 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
5763 dev_set_rx_mode(dev
);
5765 __dev_notify_flags(dev
, old_flags
,
5766 dev
->gflags
^ old_gflags
);
5772 * dev_set_allmulti - update allmulti count on a device
5776 * Add or remove reception of all multicast frames to a device. While the
5777 * count in the device remains above zero the interface remains listening
5778 * to all interfaces. Once it hits zero the device reverts back to normal
5779 * filtering operation. A negative @inc value is used to drop the counter
5780 * when releasing a resource needing all multicasts.
5781 * Return 0 if successful or a negative errno code on error.
5784 int dev_set_allmulti(struct net_device
*dev
, int inc
)
5786 return __dev_set_allmulti(dev
, inc
, true);
5788 EXPORT_SYMBOL(dev_set_allmulti
);
5791 * Upload unicast and multicast address lists to device and
5792 * configure RX filtering. When the device doesn't support unicast
5793 * filtering it is put in promiscuous mode while unicast addresses
5796 void __dev_set_rx_mode(struct net_device
*dev
)
5798 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5800 /* dev_open will call this function so the list will stay sane. */
5801 if (!(dev
->flags
&IFF_UP
))
5804 if (!netif_device_present(dev
))
5807 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
5808 /* Unicast addresses changes may only happen under the rtnl,
5809 * therefore calling __dev_set_promiscuity here is safe.
5811 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
5812 __dev_set_promiscuity(dev
, 1, false);
5813 dev
->uc_promisc
= true;
5814 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
5815 __dev_set_promiscuity(dev
, -1, false);
5816 dev
->uc_promisc
= false;
5820 if (ops
->ndo_set_rx_mode
)
5821 ops
->ndo_set_rx_mode(dev
);
5824 void dev_set_rx_mode(struct net_device
*dev
)
5826 netif_addr_lock_bh(dev
);
5827 __dev_set_rx_mode(dev
);
5828 netif_addr_unlock_bh(dev
);
5832 * dev_get_flags - get flags reported to userspace
5835 * Get the combination of flag bits exported through APIs to userspace.
5837 unsigned int dev_get_flags(const struct net_device
*dev
)
5841 flags
= (dev
->flags
& ~(IFF_PROMISC
|
5846 (dev
->gflags
& (IFF_PROMISC
|
5849 if (netif_running(dev
)) {
5850 if (netif_oper_up(dev
))
5851 flags
|= IFF_RUNNING
;
5852 if (netif_carrier_ok(dev
))
5853 flags
|= IFF_LOWER_UP
;
5854 if (netif_dormant(dev
))
5855 flags
|= IFF_DORMANT
;
5860 EXPORT_SYMBOL(dev_get_flags
);
5862 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5864 unsigned int old_flags
= dev
->flags
;
5870 * Set the flags on our device.
5873 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
5874 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
5876 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
5880 * Load in the correct multicast list now the flags have changed.
5883 if ((old_flags
^ flags
) & IFF_MULTICAST
)
5884 dev_change_rx_flags(dev
, IFF_MULTICAST
);
5886 dev_set_rx_mode(dev
);
5889 * Have we downed the interface. We handle IFF_UP ourselves
5890 * according to user attempts to set it, rather than blindly
5895 if ((old_flags
^ flags
) & IFF_UP
)
5896 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
5898 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
5899 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
5900 unsigned int old_flags
= dev
->flags
;
5902 dev
->gflags
^= IFF_PROMISC
;
5904 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
5905 if (dev
->flags
!= old_flags
)
5906 dev_set_rx_mode(dev
);
5909 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5910 is important. Some (broken) drivers set IFF_PROMISC, when
5911 IFF_ALLMULTI is requested not asking us and not reporting.
5913 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
5914 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
5916 dev
->gflags
^= IFF_ALLMULTI
;
5917 __dev_set_allmulti(dev
, inc
, false);
5923 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
5924 unsigned int gchanges
)
5926 unsigned int changes
= dev
->flags
^ old_flags
;
5929 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
5931 if (changes
& IFF_UP
) {
5932 if (dev
->flags
& IFF_UP
)
5933 call_netdevice_notifiers(NETDEV_UP
, dev
);
5935 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
5938 if (dev
->flags
& IFF_UP
&&
5939 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
5940 struct netdev_notifier_change_info change_info
;
5942 change_info
.flags_changed
= changes
;
5943 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
5949 * dev_change_flags - change device settings
5951 * @flags: device state flags
5953 * Change settings on device based state flags. The flags are
5954 * in the userspace exported format.
5956 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5959 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5961 ret
= __dev_change_flags(dev
, flags
);
5965 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
5966 __dev_notify_flags(dev
, old_flags
, changes
);
5969 EXPORT_SYMBOL(dev_change_flags
);
5971 static int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5973 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5975 if (ops
->ndo_change_mtu
)
5976 return ops
->ndo_change_mtu(dev
, new_mtu
);
5983 * dev_set_mtu - Change maximum transfer unit
5985 * @new_mtu: new transfer unit
5987 * Change the maximum transfer size of the network device.
5989 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5993 if (new_mtu
== dev
->mtu
)
5996 /* MTU must be positive. */
6000 if (!netif_device_present(dev
))
6003 err
= call_netdevice_notifiers(NETDEV_PRECHANGEMTU
, dev
);
6004 err
= notifier_to_errno(err
);
6008 orig_mtu
= dev
->mtu
;
6009 err
= __dev_set_mtu(dev
, new_mtu
);
6012 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6013 err
= notifier_to_errno(err
);
6015 /* setting mtu back and notifying everyone again,
6016 * so that they have a chance to revert changes.
6018 __dev_set_mtu(dev
, orig_mtu
);
6019 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6024 EXPORT_SYMBOL(dev_set_mtu
);
6027 * dev_set_group - Change group this device belongs to
6029 * @new_group: group this device should belong to
6031 void dev_set_group(struct net_device
*dev
, int new_group
)
6033 dev
->group
= new_group
;
6035 EXPORT_SYMBOL(dev_set_group
);
6038 * dev_set_mac_address - Change Media Access Control Address
6042 * Change the hardware (MAC) address of the device
6044 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
6046 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6049 if (!ops
->ndo_set_mac_address
)
6051 if (sa
->sa_family
!= dev
->type
)
6053 if (!netif_device_present(dev
))
6055 err
= ops
->ndo_set_mac_address(dev
, sa
);
6058 dev
->addr_assign_type
= NET_ADDR_SET
;
6059 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
6060 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6063 EXPORT_SYMBOL(dev_set_mac_address
);
6066 * dev_change_carrier - Change device carrier
6068 * @new_carrier: new value
6070 * Change device carrier
6072 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
6074 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6076 if (!ops
->ndo_change_carrier
)
6078 if (!netif_device_present(dev
))
6080 return ops
->ndo_change_carrier(dev
, new_carrier
);
6082 EXPORT_SYMBOL(dev_change_carrier
);
6085 * dev_get_phys_port_id - Get device physical port ID
6089 * Get device physical port ID
6091 int dev_get_phys_port_id(struct net_device
*dev
,
6092 struct netdev_phys_item_id
*ppid
)
6094 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6096 if (!ops
->ndo_get_phys_port_id
)
6098 return ops
->ndo_get_phys_port_id(dev
, ppid
);
6100 EXPORT_SYMBOL(dev_get_phys_port_id
);
6103 * dev_get_phys_port_name - Get device physical port name
6107 * Get device physical port name
6109 int dev_get_phys_port_name(struct net_device
*dev
,
6110 char *name
, size_t len
)
6112 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6114 if (!ops
->ndo_get_phys_port_name
)
6116 return ops
->ndo_get_phys_port_name(dev
, name
, len
);
6118 EXPORT_SYMBOL(dev_get_phys_port_name
);
6121 * dev_change_proto_down - update protocol port state information
6123 * @proto_down: new value
6125 * This info can be used by switch drivers to set the phys state of the
6128 int dev_change_proto_down(struct net_device
*dev
, bool proto_down
)
6130 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6132 if (!ops
->ndo_change_proto_down
)
6134 if (!netif_device_present(dev
))
6136 return ops
->ndo_change_proto_down(dev
, proto_down
);
6138 EXPORT_SYMBOL(dev_change_proto_down
);
6141 * dev_new_index - allocate an ifindex
6142 * @net: the applicable net namespace
6144 * Returns a suitable unique value for a new device interface
6145 * number. The caller must hold the rtnl semaphore or the
6146 * dev_base_lock to be sure it remains unique.
6148 static int dev_new_index(struct net
*net
)
6150 int ifindex
= net
->ifindex
;
6154 if (!__dev_get_by_index(net
, ifindex
))
6155 return net
->ifindex
= ifindex
;
6159 /* Delayed registration/unregisteration */
6160 static LIST_HEAD(net_todo_list
);
6161 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
6163 static void net_set_todo(struct net_device
*dev
)
6165 list_add_tail(&dev
->todo_list
, &net_todo_list
);
6166 dev_net(dev
)->dev_unreg_count
++;
6169 static void rollback_registered_many(struct list_head
*head
)
6171 struct net_device
*dev
, *tmp
;
6172 LIST_HEAD(close_head
);
6174 BUG_ON(dev_boot_phase
);
6177 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
6178 /* Some devices call without registering
6179 * for initialization unwind. Remove those
6180 * devices and proceed with the remaining.
6182 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6183 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6187 list_del(&dev
->unreg_list
);
6190 dev
->dismantle
= true;
6191 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
6194 /* If device is running, close it first. */
6195 list_for_each_entry(dev
, head
, unreg_list
)
6196 list_add_tail(&dev
->close_list
, &close_head
);
6197 dev_close_many(&close_head
, true);
6199 list_for_each_entry(dev
, head
, unreg_list
) {
6200 /* And unlink it from device chain. */
6201 unlist_netdevice(dev
);
6203 dev
->reg_state
= NETREG_UNREGISTERING
;
6204 on_each_cpu(flush_backlog
, dev
, 1);
6209 list_for_each_entry(dev
, head
, unreg_list
) {
6210 struct sk_buff
*skb
= NULL
;
6212 /* Shutdown queueing discipline. */
6216 /* Notify protocols, that we are about to destroy
6217 this device. They should clean all the things.
6219 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6221 if (!dev
->rtnl_link_ops
||
6222 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6223 skb
= rtmsg_ifinfo_build_skb(RTM_DELLINK
, dev
, ~0U,
6227 * Flush the unicast and multicast chains
6232 if (dev
->netdev_ops
->ndo_uninit
)
6233 dev
->netdev_ops
->ndo_uninit(dev
);
6236 rtmsg_ifinfo_send(skb
, dev
, GFP_KERNEL
);
6238 /* Notifier chain MUST detach us all upper devices. */
6239 WARN_ON(netdev_has_any_upper_dev(dev
));
6241 /* Remove entries from kobject tree */
6242 netdev_unregister_kobject(dev
);
6244 /* Remove XPS queueing entries */
6245 netif_reset_xps_queues_gt(dev
, 0);
6251 list_for_each_entry(dev
, head
, unreg_list
)
6255 static void rollback_registered(struct net_device
*dev
)
6259 list_add(&dev
->unreg_list
, &single
);
6260 rollback_registered_many(&single
);
6264 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
6265 netdev_features_t features
)
6267 /* Fix illegal checksum combinations */
6268 if ((features
& NETIF_F_HW_CSUM
) &&
6269 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6270 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
6271 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
6274 /* TSO requires that SG is present as well. */
6275 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
6276 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
6277 features
&= ~NETIF_F_ALL_TSO
;
6280 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
6281 !(features
& NETIF_F_IP_CSUM
)) {
6282 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
6283 features
&= ~NETIF_F_TSO
;
6284 features
&= ~NETIF_F_TSO_ECN
;
6287 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
6288 !(features
& NETIF_F_IPV6_CSUM
)) {
6289 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
6290 features
&= ~NETIF_F_TSO6
;
6293 /* TSO ECN requires that TSO is present as well. */
6294 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
6295 features
&= ~NETIF_F_TSO_ECN
;
6297 /* Software GSO depends on SG. */
6298 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
6299 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
6300 features
&= ~NETIF_F_GSO
;
6303 /* UFO needs SG and checksumming */
6304 if (features
& NETIF_F_UFO
) {
6305 /* maybe split UFO into V4 and V6? */
6306 if (!((features
& NETIF_F_GEN_CSUM
) ||
6307 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
6308 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6310 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6311 features
&= ~NETIF_F_UFO
;
6314 if (!(features
& NETIF_F_SG
)) {
6316 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6317 features
&= ~NETIF_F_UFO
;
6321 #ifdef CONFIG_NET_RX_BUSY_POLL
6322 if (dev
->netdev_ops
->ndo_busy_poll
)
6323 features
|= NETIF_F_BUSY_POLL
;
6326 features
&= ~NETIF_F_BUSY_POLL
;
6331 int __netdev_update_features(struct net_device
*dev
)
6333 netdev_features_t features
;
6338 features
= netdev_get_wanted_features(dev
);
6340 if (dev
->netdev_ops
->ndo_fix_features
)
6341 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
6343 /* driver might be less strict about feature dependencies */
6344 features
= netdev_fix_features(dev
, features
);
6346 if (dev
->features
== features
)
6349 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
6350 &dev
->features
, &features
);
6352 if (dev
->netdev_ops
->ndo_set_features
)
6353 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
6355 if (unlikely(err
< 0)) {
6357 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6358 err
, &features
, &dev
->features
);
6363 dev
->features
= features
;
6369 * netdev_update_features - recalculate device features
6370 * @dev: the device to check
6372 * Recalculate dev->features set and send notifications if it
6373 * has changed. Should be called after driver or hardware dependent
6374 * conditions might have changed that influence the features.
6376 void netdev_update_features(struct net_device
*dev
)
6378 if (__netdev_update_features(dev
))
6379 netdev_features_change(dev
);
6381 EXPORT_SYMBOL(netdev_update_features
);
6384 * netdev_change_features - recalculate device features
6385 * @dev: the device to check
6387 * Recalculate dev->features set and send notifications even
6388 * if they have not changed. Should be called instead of
6389 * netdev_update_features() if also dev->vlan_features might
6390 * have changed to allow the changes to be propagated to stacked
6393 void netdev_change_features(struct net_device
*dev
)
6395 __netdev_update_features(dev
);
6396 netdev_features_change(dev
);
6398 EXPORT_SYMBOL(netdev_change_features
);
6401 * netif_stacked_transfer_operstate - transfer operstate
6402 * @rootdev: the root or lower level device to transfer state from
6403 * @dev: the device to transfer operstate to
6405 * Transfer operational state from root to device. This is normally
6406 * called when a stacking relationship exists between the root
6407 * device and the device(a leaf device).
6409 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
6410 struct net_device
*dev
)
6412 if (rootdev
->operstate
== IF_OPER_DORMANT
)
6413 netif_dormant_on(dev
);
6415 netif_dormant_off(dev
);
6417 if (netif_carrier_ok(rootdev
)) {
6418 if (!netif_carrier_ok(dev
))
6419 netif_carrier_on(dev
);
6421 if (netif_carrier_ok(dev
))
6422 netif_carrier_off(dev
);
6425 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
6428 static int netif_alloc_rx_queues(struct net_device
*dev
)
6430 unsigned int i
, count
= dev
->num_rx_queues
;
6431 struct netdev_rx_queue
*rx
;
6432 size_t sz
= count
* sizeof(*rx
);
6436 rx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6444 for (i
= 0; i
< count
; i
++)
6450 static void netdev_init_one_queue(struct net_device
*dev
,
6451 struct netdev_queue
*queue
, void *_unused
)
6453 /* Initialize queue lock */
6454 spin_lock_init(&queue
->_xmit_lock
);
6455 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
6456 queue
->xmit_lock_owner
= -1;
6457 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
6460 dql_init(&queue
->dql
, HZ
);
6464 static void netif_free_tx_queues(struct net_device
*dev
)
6469 static int netif_alloc_netdev_queues(struct net_device
*dev
)
6471 unsigned int count
= dev
->num_tx_queues
;
6472 struct netdev_queue
*tx
;
6473 size_t sz
= count
* sizeof(*tx
);
6475 if (count
< 1 || count
> 0xffff)
6478 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6486 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
6487 spin_lock_init(&dev
->tx_global_lock
);
6492 void netif_tx_stop_all_queues(struct net_device
*dev
)
6496 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
6497 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
6498 netif_tx_stop_queue(txq
);
6501 EXPORT_SYMBOL(netif_tx_stop_all_queues
);
6504 * register_netdevice - register a network device
6505 * @dev: device to register
6507 * Take a completed network device structure and add it to the kernel
6508 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6509 * chain. 0 is returned on success. A negative errno code is returned
6510 * on a failure to set up the device, or if the name is a duplicate.
6512 * Callers must hold the rtnl semaphore. You may want
6513 * register_netdev() instead of this.
6516 * The locking appears insufficient to guarantee two parallel registers
6517 * will not get the same name.
6520 int register_netdevice(struct net_device
*dev
)
6523 struct net
*net
= dev_net(dev
);
6525 BUG_ON(dev_boot_phase
);
6530 /* When net_device's are persistent, this will be fatal. */
6531 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
6534 spin_lock_init(&dev
->addr_list_lock
);
6535 netdev_set_addr_lockdep_class(dev
);
6537 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
6541 /* Init, if this function is available */
6542 if (dev
->netdev_ops
->ndo_init
) {
6543 ret
= dev
->netdev_ops
->ndo_init(dev
);
6551 if (((dev
->hw_features
| dev
->features
) &
6552 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
6553 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
6554 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
6555 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
6562 dev
->ifindex
= dev_new_index(net
);
6563 else if (__dev_get_by_index(net
, dev
->ifindex
))
6566 /* Transfer changeable features to wanted_features and enable
6567 * software offloads (GSO and GRO).
6569 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
6570 dev
->features
|= NETIF_F_SOFT_FEATURES
;
6571 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
6573 if (!(dev
->flags
& IFF_LOOPBACK
)) {
6574 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
6577 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6579 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
6581 /* Make NETIF_F_SG inheritable to tunnel devices.
6583 dev
->hw_enc_features
|= NETIF_F_SG
;
6585 /* Make NETIF_F_SG inheritable to MPLS.
6587 dev
->mpls_features
|= NETIF_F_SG
;
6589 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
6590 ret
= notifier_to_errno(ret
);
6594 ret
= netdev_register_kobject(dev
);
6597 dev
->reg_state
= NETREG_REGISTERED
;
6599 __netdev_update_features(dev
);
6602 * Default initial state at registry is that the
6603 * device is present.
6606 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6608 linkwatch_init_dev(dev
);
6610 dev_init_scheduler(dev
);
6612 list_netdevice(dev
);
6613 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6615 /* If the device has permanent device address, driver should
6616 * set dev_addr and also addr_assign_type should be set to
6617 * NET_ADDR_PERM (default value).
6619 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
6620 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
6622 /* Notify protocols, that a new device appeared. */
6623 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6624 ret
= notifier_to_errno(ret
);
6626 rollback_registered(dev
);
6627 dev
->reg_state
= NETREG_UNREGISTERED
;
6630 * Prevent userspace races by waiting until the network
6631 * device is fully setup before sending notifications.
6633 if (!dev
->rtnl_link_ops
||
6634 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6635 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6641 if (dev
->netdev_ops
->ndo_uninit
)
6642 dev
->netdev_ops
->ndo_uninit(dev
);
6645 EXPORT_SYMBOL(register_netdevice
);
6648 * init_dummy_netdev - init a dummy network device for NAPI
6649 * @dev: device to init
6651 * This takes a network device structure and initialize the minimum
6652 * amount of fields so it can be used to schedule NAPI polls without
6653 * registering a full blown interface. This is to be used by drivers
6654 * that need to tie several hardware interfaces to a single NAPI
6655 * poll scheduler due to HW limitations.
6657 int init_dummy_netdev(struct net_device
*dev
)
6659 /* Clear everything. Note we don't initialize spinlocks
6660 * are they aren't supposed to be taken by any of the
6661 * NAPI code and this dummy netdev is supposed to be
6662 * only ever used for NAPI polls
6664 memset(dev
, 0, sizeof(struct net_device
));
6666 /* make sure we BUG if trying to hit standard
6667 * register/unregister code path
6669 dev
->reg_state
= NETREG_DUMMY
;
6671 /* NAPI wants this */
6672 INIT_LIST_HEAD(&dev
->napi_list
);
6674 /* a dummy interface is started by default */
6675 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6676 set_bit(__LINK_STATE_START
, &dev
->state
);
6678 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6679 * because users of this 'device' dont need to change
6685 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
6689 * register_netdev - register a network device
6690 * @dev: device to register
6692 * Take a completed network device structure and add it to the kernel
6693 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6694 * chain. 0 is returned on success. A negative errno code is returned
6695 * on a failure to set up the device, or if the name is a duplicate.
6697 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6698 * and expands the device name if you passed a format string to
6701 int register_netdev(struct net_device
*dev
)
6706 err
= register_netdevice(dev
);
6710 EXPORT_SYMBOL(register_netdev
);
6712 int netdev_refcnt_read(const struct net_device
*dev
)
6716 for_each_possible_cpu(i
)
6717 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
6720 EXPORT_SYMBOL(netdev_refcnt_read
);
6723 * netdev_wait_allrefs - wait until all references are gone.
6724 * @dev: target net_device
6726 * This is called when unregistering network devices.
6728 * Any protocol or device that holds a reference should register
6729 * for netdevice notification, and cleanup and put back the
6730 * reference if they receive an UNREGISTER event.
6731 * We can get stuck here if buggy protocols don't correctly
6734 static void netdev_wait_allrefs(struct net_device
*dev
)
6736 unsigned long rebroadcast_time
, warning_time
;
6739 linkwatch_forget_dev(dev
);
6741 rebroadcast_time
= warning_time
= jiffies
;
6742 refcnt
= netdev_refcnt_read(dev
);
6744 while (refcnt
!= 0) {
6745 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
6748 /* Rebroadcast unregister notification */
6749 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6755 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6756 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
6758 /* We must not have linkwatch events
6759 * pending on unregister. If this
6760 * happens, we simply run the queue
6761 * unscheduled, resulting in a noop
6764 linkwatch_run_queue();
6769 rebroadcast_time
= jiffies
;
6774 refcnt
= netdev_refcnt_read(dev
);
6776 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
6777 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6779 warning_time
= jiffies
;
6788 * register_netdevice(x1);
6789 * register_netdevice(x2);
6791 * unregister_netdevice(y1);
6792 * unregister_netdevice(y2);
6798 * We are invoked by rtnl_unlock().
6799 * This allows us to deal with problems:
6800 * 1) We can delete sysfs objects which invoke hotplug
6801 * without deadlocking with linkwatch via keventd.
6802 * 2) Since we run with the RTNL semaphore not held, we can sleep
6803 * safely in order to wait for the netdev refcnt to drop to zero.
6805 * We must not return until all unregister events added during
6806 * the interval the lock was held have been completed.
6808 void netdev_run_todo(void)
6810 struct list_head list
;
6812 /* Snapshot list, allow later requests */
6813 list_replace_init(&net_todo_list
, &list
);
6818 /* Wait for rcu callbacks to finish before next phase */
6819 if (!list_empty(&list
))
6822 while (!list_empty(&list
)) {
6823 struct net_device
*dev
6824 = list_first_entry(&list
, struct net_device
, todo_list
);
6825 list_del(&dev
->todo_list
);
6828 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6831 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
6832 pr_err("network todo '%s' but state %d\n",
6833 dev
->name
, dev
->reg_state
);
6838 dev
->reg_state
= NETREG_UNREGISTERED
;
6840 netdev_wait_allrefs(dev
);
6843 BUG_ON(netdev_refcnt_read(dev
));
6844 BUG_ON(!list_empty(&dev
->ptype_all
));
6845 BUG_ON(!list_empty(&dev
->ptype_specific
));
6846 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
6847 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
6848 WARN_ON(dev
->dn_ptr
);
6850 if (dev
->destructor
)
6851 dev
->destructor(dev
);
6853 /* Report a network device has been unregistered */
6855 dev_net(dev
)->dev_unreg_count
--;
6857 wake_up(&netdev_unregistering_wq
);
6859 /* Free network device */
6860 kobject_put(&dev
->dev
.kobj
);
6864 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6865 * fields in the same order, with only the type differing.
6867 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
6868 const struct net_device_stats
*netdev_stats
)
6870 #if BITS_PER_LONG == 64
6871 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
6872 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
6874 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
6875 const unsigned long *src
= (const unsigned long *)netdev_stats
;
6876 u64
*dst
= (u64
*)stats64
;
6878 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
6879 sizeof(*stats64
) / sizeof(u64
));
6880 for (i
= 0; i
< n
; i
++)
6884 EXPORT_SYMBOL(netdev_stats_to_stats64
);
6887 * dev_get_stats - get network device statistics
6888 * @dev: device to get statistics from
6889 * @storage: place to store stats
6891 * Get network statistics from device. Return @storage.
6892 * The device driver may provide its own method by setting
6893 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6894 * otherwise the internal statistics structure is used.
6896 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
6897 struct rtnl_link_stats64
*storage
)
6899 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6901 if (ops
->ndo_get_stats64
) {
6902 memset(storage
, 0, sizeof(*storage
));
6903 ops
->ndo_get_stats64(dev
, storage
);
6904 } else if (ops
->ndo_get_stats
) {
6905 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
6907 netdev_stats_to_stats64(storage
, &dev
->stats
);
6909 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
6910 storage
->tx_dropped
+= atomic_long_read(&dev
->tx_dropped
);
6913 EXPORT_SYMBOL(dev_get_stats
);
6915 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
6917 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
6919 #ifdef CONFIG_NET_CLS_ACT
6922 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
6925 netdev_init_one_queue(dev
, queue
, NULL
);
6926 RCU_INIT_POINTER(queue
->qdisc
, &noop_qdisc
);
6927 queue
->qdisc_sleeping
= &noop_qdisc
;
6928 rcu_assign_pointer(dev
->ingress_queue
, queue
);
6933 static const struct ethtool_ops default_ethtool_ops
;
6935 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
6936 const struct ethtool_ops
*ops
)
6938 if (dev
->ethtool_ops
== &default_ethtool_ops
)
6939 dev
->ethtool_ops
= ops
;
6941 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
6943 void netdev_freemem(struct net_device
*dev
)
6945 char *addr
= (char *)dev
- dev
->padded
;
6951 * alloc_netdev_mqs - allocate network device
6952 * @sizeof_priv: size of private data to allocate space for
6953 * @name: device name format string
6954 * @name_assign_type: origin of device name
6955 * @setup: callback to initialize device
6956 * @txqs: the number of TX subqueues to allocate
6957 * @rxqs: the number of RX subqueues to allocate
6959 * Allocates a struct net_device with private data area for driver use
6960 * and performs basic initialization. Also allocates subqueue structs
6961 * for each queue on the device.
6963 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
6964 unsigned char name_assign_type
,
6965 void (*setup
)(struct net_device
*),
6966 unsigned int txqs
, unsigned int rxqs
)
6968 struct net_device
*dev
;
6970 struct net_device
*p
;
6972 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
6975 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6981 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6986 alloc_size
= sizeof(struct net_device
);
6988 /* ensure 32-byte alignment of private area */
6989 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
6990 alloc_size
+= sizeof_priv
;
6992 /* ensure 32-byte alignment of whole construct */
6993 alloc_size
+= NETDEV_ALIGN
- 1;
6995 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6997 p
= vzalloc(alloc_size
);
7001 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
7002 dev
->padded
= (char *)dev
- (char *)p
;
7004 dev
->pcpu_refcnt
= alloc_percpu(int);
7005 if (!dev
->pcpu_refcnt
)
7008 if (dev_addr_init(dev
))
7014 dev_net_set(dev
, &init_net
);
7016 dev
->gso_max_size
= GSO_MAX_SIZE
;
7017 dev
->gso_max_segs
= GSO_MAX_SEGS
;
7018 dev
->gso_min_segs
= 0;
7020 INIT_LIST_HEAD(&dev
->napi_list
);
7021 INIT_LIST_HEAD(&dev
->unreg_list
);
7022 INIT_LIST_HEAD(&dev
->close_list
);
7023 INIT_LIST_HEAD(&dev
->link_watch_list
);
7024 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
7025 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
7026 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
7027 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
7028 INIT_LIST_HEAD(&dev
->ptype_all
);
7029 INIT_LIST_HEAD(&dev
->ptype_specific
);
7030 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
| IFF_XMIT_DST_RELEASE_PERM
;
7033 if (!dev
->tx_queue_len
)
7034 dev
->priv_flags
|= IFF_NO_QUEUE
;
7036 dev
->num_tx_queues
= txqs
;
7037 dev
->real_num_tx_queues
= txqs
;
7038 if (netif_alloc_netdev_queues(dev
))
7042 dev
->num_rx_queues
= rxqs
;
7043 dev
->real_num_rx_queues
= rxqs
;
7044 if (netif_alloc_rx_queues(dev
))
7048 strcpy(dev
->name
, name
);
7049 dev
->name_assign_type
= name_assign_type
;
7050 dev
->group
= INIT_NETDEV_GROUP
;
7051 if (!dev
->ethtool_ops
)
7052 dev
->ethtool_ops
= &default_ethtool_ops
;
7054 nf_hook_ingress_init(dev
);
7063 free_percpu(dev
->pcpu_refcnt
);
7065 netdev_freemem(dev
);
7068 EXPORT_SYMBOL(alloc_netdev_mqs
);
7071 * free_netdev - free network device
7074 * This function does the last stage of destroying an allocated device
7075 * interface. The reference to the device object is released.
7076 * If this is the last reference then it will be freed.
7078 void free_netdev(struct net_device
*dev
)
7080 struct napi_struct
*p
, *n
;
7082 netif_free_tx_queues(dev
);
7087 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
7089 /* Flush device addresses */
7090 dev_addr_flush(dev
);
7092 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
7095 free_percpu(dev
->pcpu_refcnt
);
7096 dev
->pcpu_refcnt
= NULL
;
7098 /* Compatibility with error handling in drivers */
7099 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
7100 netdev_freemem(dev
);
7104 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
7105 dev
->reg_state
= NETREG_RELEASED
;
7107 /* will free via device release */
7108 put_device(&dev
->dev
);
7110 EXPORT_SYMBOL(free_netdev
);
7113 * synchronize_net - Synchronize with packet receive processing
7115 * Wait for packets currently being received to be done.
7116 * Does not block later packets from starting.
7118 void synchronize_net(void)
7121 if (rtnl_is_locked())
7122 synchronize_rcu_expedited();
7126 EXPORT_SYMBOL(synchronize_net
);
7129 * unregister_netdevice_queue - remove device from the kernel
7133 * This function shuts down a device interface and removes it
7134 * from the kernel tables.
7135 * If head not NULL, device is queued to be unregistered later.
7137 * Callers must hold the rtnl semaphore. You may want
7138 * unregister_netdev() instead of this.
7141 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
7146 list_move_tail(&dev
->unreg_list
, head
);
7148 rollback_registered(dev
);
7149 /* Finish processing unregister after unlock */
7153 EXPORT_SYMBOL(unregister_netdevice_queue
);
7156 * unregister_netdevice_many - unregister many devices
7157 * @head: list of devices
7159 * Note: As most callers use a stack allocated list_head,
7160 * we force a list_del() to make sure stack wont be corrupted later.
7162 void unregister_netdevice_many(struct list_head
*head
)
7164 struct net_device
*dev
;
7166 if (!list_empty(head
)) {
7167 rollback_registered_many(head
);
7168 list_for_each_entry(dev
, head
, unreg_list
)
7173 EXPORT_SYMBOL(unregister_netdevice_many
);
7176 * unregister_netdev - remove device from the kernel
7179 * This function shuts down a device interface and removes it
7180 * from the kernel tables.
7182 * This is just a wrapper for unregister_netdevice that takes
7183 * the rtnl semaphore. In general you want to use this and not
7184 * unregister_netdevice.
7186 void unregister_netdev(struct net_device
*dev
)
7189 unregister_netdevice(dev
);
7192 EXPORT_SYMBOL(unregister_netdev
);
7195 * dev_change_net_namespace - move device to different nethost namespace
7197 * @net: network namespace
7198 * @pat: If not NULL name pattern to try if the current device name
7199 * is already taken in the destination network namespace.
7201 * This function shuts down a device interface and moves it
7202 * to a new network namespace. On success 0 is returned, on
7203 * a failure a netagive errno code is returned.
7205 * Callers must hold the rtnl semaphore.
7208 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
7214 /* Don't allow namespace local devices to be moved. */
7216 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7219 /* Ensure the device has been registrered */
7220 if (dev
->reg_state
!= NETREG_REGISTERED
)
7223 /* Get out if there is nothing todo */
7225 if (net_eq(dev_net(dev
), net
))
7228 /* Pick the destination device name, and ensure
7229 * we can use it in the destination network namespace.
7232 if (__dev_get_by_name(net
, dev
->name
)) {
7233 /* We get here if we can't use the current device name */
7236 if (dev_get_valid_name(net
, dev
, pat
) < 0)
7241 * And now a mini version of register_netdevice unregister_netdevice.
7244 /* If device is running close it first. */
7247 /* And unlink it from device chain */
7249 unlist_netdevice(dev
);
7253 /* Shutdown queueing discipline. */
7256 /* Notify protocols, that we are about to destroy
7257 this device. They should clean all the things.
7259 Note that dev->reg_state stays at NETREG_REGISTERED.
7260 This is wanted because this way 8021q and macvlan know
7261 the device is just moving and can keep their slaves up.
7263 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
7265 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7266 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
7269 * Flush the unicast and multicast chains
7274 /* Send a netdev-removed uevent to the old namespace */
7275 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
7276 netdev_adjacent_del_links(dev
);
7278 /* Actually switch the network namespace */
7279 dev_net_set(dev
, net
);
7281 /* If there is an ifindex conflict assign a new one */
7282 if (__dev_get_by_index(net
, dev
->ifindex
))
7283 dev
->ifindex
= dev_new_index(net
);
7285 /* Send a netdev-add uevent to the new namespace */
7286 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
7287 netdev_adjacent_add_links(dev
);
7289 /* Fixup kobjects */
7290 err
= device_rename(&dev
->dev
, dev
->name
);
7293 /* Add the device back in the hashes */
7294 list_netdevice(dev
);
7296 /* Notify protocols, that a new device appeared. */
7297 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
7300 * Prevent userspace races by waiting until the network
7301 * device is fully setup before sending notifications.
7303 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
7310 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
7312 static int dev_cpu_callback(struct notifier_block
*nfb
,
7313 unsigned long action
,
7316 struct sk_buff
**list_skb
;
7317 struct sk_buff
*skb
;
7318 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
7319 struct softnet_data
*sd
, *oldsd
;
7321 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
7324 local_irq_disable();
7325 cpu
= smp_processor_id();
7326 sd
= &per_cpu(softnet_data
, cpu
);
7327 oldsd
= &per_cpu(softnet_data
, oldcpu
);
7329 /* Find end of our completion_queue. */
7330 list_skb
= &sd
->completion_queue
;
7332 list_skb
= &(*list_skb
)->next
;
7333 /* Append completion queue from offline CPU. */
7334 *list_skb
= oldsd
->completion_queue
;
7335 oldsd
->completion_queue
= NULL
;
7337 /* Append output queue from offline CPU. */
7338 if (oldsd
->output_queue
) {
7339 *sd
->output_queue_tailp
= oldsd
->output_queue
;
7340 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
7341 oldsd
->output_queue
= NULL
;
7342 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
7344 /* Append NAPI poll list from offline CPU, with one exception :
7345 * process_backlog() must be called by cpu owning percpu backlog.
7346 * We properly handle process_queue & input_pkt_queue later.
7348 while (!list_empty(&oldsd
->poll_list
)) {
7349 struct napi_struct
*napi
= list_first_entry(&oldsd
->poll_list
,
7353 list_del_init(&napi
->poll_list
);
7354 if (napi
->poll
== process_backlog
)
7357 ____napi_schedule(sd
, napi
);
7360 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
7363 /* Process offline CPU's input_pkt_queue */
7364 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
7366 input_queue_head_incr(oldsd
);
7368 while ((skb
= skb_dequeue(&oldsd
->input_pkt_queue
))) {
7370 input_queue_head_incr(oldsd
);
7378 * netdev_increment_features - increment feature set by one
7379 * @all: current feature set
7380 * @one: new feature set
7381 * @mask: mask feature set
7383 * Computes a new feature set after adding a device with feature set
7384 * @one to the master device with current feature set @all. Will not
7385 * enable anything that is off in @mask. Returns the new feature set.
7387 netdev_features_t
netdev_increment_features(netdev_features_t all
,
7388 netdev_features_t one
, netdev_features_t mask
)
7390 if (mask
& NETIF_F_GEN_CSUM
)
7391 mask
|= NETIF_F_ALL_CSUM
;
7392 mask
|= NETIF_F_VLAN_CHALLENGED
;
7394 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
7395 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
7397 /* If one device supports hw checksumming, set for all. */
7398 if (all
& NETIF_F_GEN_CSUM
)
7399 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
7403 EXPORT_SYMBOL(netdev_increment_features
);
7405 static struct hlist_head
* __net_init
netdev_create_hash(void)
7408 struct hlist_head
*hash
;
7410 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
7412 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
7413 INIT_HLIST_HEAD(&hash
[i
]);
7418 /* Initialize per network namespace state */
7419 static int __net_init
netdev_init(struct net
*net
)
7421 if (net
!= &init_net
)
7422 INIT_LIST_HEAD(&net
->dev_base_head
);
7424 net
->dev_name_head
= netdev_create_hash();
7425 if (net
->dev_name_head
== NULL
)
7428 net
->dev_index_head
= netdev_create_hash();
7429 if (net
->dev_index_head
== NULL
)
7435 kfree(net
->dev_name_head
);
7441 * netdev_drivername - network driver for the device
7442 * @dev: network device
7444 * Determine network driver for device.
7446 const char *netdev_drivername(const struct net_device
*dev
)
7448 const struct device_driver
*driver
;
7449 const struct device
*parent
;
7450 const char *empty
= "";
7452 parent
= dev
->dev
.parent
;
7456 driver
= parent
->driver
;
7457 if (driver
&& driver
->name
)
7458 return driver
->name
;
7462 static void __netdev_printk(const char *level
, const struct net_device
*dev
,
7463 struct va_format
*vaf
)
7465 if (dev
&& dev
->dev
.parent
) {
7466 dev_printk_emit(level
[1] - '0',
7469 dev_driver_string(dev
->dev
.parent
),
7470 dev_name(dev
->dev
.parent
),
7471 netdev_name(dev
), netdev_reg_state(dev
),
7474 printk("%s%s%s: %pV",
7475 level
, netdev_name(dev
), netdev_reg_state(dev
), vaf
);
7477 printk("%s(NULL net_device): %pV", level
, vaf
);
7481 void netdev_printk(const char *level
, const struct net_device
*dev
,
7482 const char *format
, ...)
7484 struct va_format vaf
;
7487 va_start(args
, format
);
7492 __netdev_printk(level
, dev
, &vaf
);
7496 EXPORT_SYMBOL(netdev_printk
);
7498 #define define_netdev_printk_level(func, level) \
7499 void func(const struct net_device *dev, const char *fmt, ...) \
7501 struct va_format vaf; \
7504 va_start(args, fmt); \
7509 __netdev_printk(level, dev, &vaf); \
7513 EXPORT_SYMBOL(func);
7515 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
7516 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
7517 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
7518 define_netdev_printk_level(netdev_err
, KERN_ERR
);
7519 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
7520 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
7521 define_netdev_printk_level(netdev_info
, KERN_INFO
);
7523 static void __net_exit
netdev_exit(struct net
*net
)
7525 kfree(net
->dev_name_head
);
7526 kfree(net
->dev_index_head
);
7529 static struct pernet_operations __net_initdata netdev_net_ops
= {
7530 .init
= netdev_init
,
7531 .exit
= netdev_exit
,
7534 static void __net_exit
default_device_exit(struct net
*net
)
7536 struct net_device
*dev
, *aux
;
7538 * Push all migratable network devices back to the
7539 * initial network namespace
7542 for_each_netdev_safe(net
, dev
, aux
) {
7544 char fb_name
[IFNAMSIZ
];
7546 /* Ignore unmoveable devices (i.e. loopback) */
7547 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7550 /* Leave virtual devices for the generic cleanup */
7551 if (dev
->rtnl_link_ops
)
7554 /* Push remaining network devices to init_net */
7555 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
7556 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
7558 pr_emerg("%s: failed to move %s to init_net: %d\n",
7559 __func__
, dev
->name
, err
);
7566 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
7568 /* Return with the rtnl_lock held when there are no network
7569 * devices unregistering in any network namespace in net_list.
7573 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
7575 add_wait_queue(&netdev_unregistering_wq
, &wait
);
7577 unregistering
= false;
7579 list_for_each_entry(net
, net_list
, exit_list
) {
7580 if (net
->dev_unreg_count
> 0) {
7581 unregistering
= true;
7589 wait_woken(&wait
, TASK_UNINTERRUPTIBLE
, MAX_SCHEDULE_TIMEOUT
);
7591 remove_wait_queue(&netdev_unregistering_wq
, &wait
);
7594 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
7596 /* At exit all network devices most be removed from a network
7597 * namespace. Do this in the reverse order of registration.
7598 * Do this across as many network namespaces as possible to
7599 * improve batching efficiency.
7601 struct net_device
*dev
;
7603 LIST_HEAD(dev_kill_list
);
7605 /* To prevent network device cleanup code from dereferencing
7606 * loopback devices or network devices that have been freed
7607 * wait here for all pending unregistrations to complete,
7608 * before unregistring the loopback device and allowing the
7609 * network namespace be freed.
7611 * The netdev todo list containing all network devices
7612 * unregistrations that happen in default_device_exit_batch
7613 * will run in the rtnl_unlock() at the end of
7614 * default_device_exit_batch.
7616 rtnl_lock_unregistering(net_list
);
7617 list_for_each_entry(net
, net_list
, exit_list
) {
7618 for_each_netdev_reverse(net
, dev
) {
7619 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
)
7620 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
7622 unregister_netdevice_queue(dev
, &dev_kill_list
);
7625 unregister_netdevice_many(&dev_kill_list
);
7629 static struct pernet_operations __net_initdata default_device_ops
= {
7630 .exit
= default_device_exit
,
7631 .exit_batch
= default_device_exit_batch
,
7635 * Initialize the DEV module. At boot time this walks the device list and
7636 * unhooks any devices that fail to initialise (normally hardware not
7637 * present) and leaves us with a valid list of present and active devices.
7642 * This is called single threaded during boot, so no need
7643 * to take the rtnl semaphore.
7645 static int __init
net_dev_init(void)
7647 int i
, rc
= -ENOMEM
;
7649 BUG_ON(!dev_boot_phase
);
7651 if (dev_proc_init())
7654 if (netdev_kobject_init())
7657 INIT_LIST_HEAD(&ptype_all
);
7658 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
7659 INIT_LIST_HEAD(&ptype_base
[i
]);
7661 INIT_LIST_HEAD(&offload_base
);
7663 if (register_pernet_subsys(&netdev_net_ops
))
7667 * Initialise the packet receive queues.
7670 for_each_possible_cpu(i
) {
7671 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
7673 skb_queue_head_init(&sd
->input_pkt_queue
);
7674 skb_queue_head_init(&sd
->process_queue
);
7675 INIT_LIST_HEAD(&sd
->poll_list
);
7676 sd
->output_queue_tailp
= &sd
->output_queue
;
7678 sd
->csd
.func
= rps_trigger_softirq
;
7683 sd
->backlog
.poll
= process_backlog
;
7684 sd
->backlog
.weight
= weight_p
;
7689 /* The loopback device is special if any other network devices
7690 * is present in a network namespace the loopback device must
7691 * be present. Since we now dynamically allocate and free the
7692 * loopback device ensure this invariant is maintained by
7693 * keeping the loopback device as the first device on the
7694 * list of network devices. Ensuring the loopback devices
7695 * is the first device that appears and the last network device
7698 if (register_pernet_device(&loopback_net_ops
))
7701 if (register_pernet_device(&default_device_ops
))
7704 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
7705 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
7707 hotcpu_notifier(dev_cpu_callback
, 0);
7714 subsys_initcall(net_dev_init
);