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 <linux/ipv6.h>
122 #include <linux/in.h>
123 #include <linux/jhash.h>
124 #include <linux/random.h>
125 #include <trace/events/napi.h>
126 #include <trace/events/net.h>
127 #include <trace/events/skb.h>
128 #include <linux/pci.h>
129 #include <linux/inetdevice.h>
130 #include <linux/cpu_rmap.h>
131 #include <linux/static_key.h>
132 #include <linux/hashtable.h>
133 #include <linux/vmalloc.h>
134 #include <linux/if_macvlan.h>
135 #include <linux/errqueue.h>
137 #include "net-sysfs.h"
139 /* Instead of increasing this, you should create a hash table. */
140 #define MAX_GRO_SKBS 8
142 /* This should be increased if a protocol with a bigger head is added. */
143 #define GRO_MAX_HEAD (MAX_HEADER + 128)
145 static DEFINE_SPINLOCK(ptype_lock
);
146 static DEFINE_SPINLOCK(offload_lock
);
147 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
148 struct list_head ptype_all __read_mostly
; /* Taps */
149 static struct list_head offload_base __read_mostly
;
151 static int netif_rx_internal(struct sk_buff
*skb
);
152 static int call_netdevice_notifiers_info(unsigned long val
,
153 struct net_device
*dev
,
154 struct netdev_notifier_info
*info
);
157 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
160 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
162 * Writers must hold the rtnl semaphore while they loop through the
163 * dev_base_head list, and hold dev_base_lock for writing when they do the
164 * actual updates. This allows pure readers to access the list even
165 * while a writer is preparing to update it.
167 * To put it another way, dev_base_lock is held for writing only to
168 * protect against pure readers; the rtnl semaphore provides the
169 * protection against other writers.
171 * See, for example usages, register_netdevice() and
172 * unregister_netdevice(), which must be called with the rtnl
175 DEFINE_RWLOCK(dev_base_lock
);
176 EXPORT_SYMBOL(dev_base_lock
);
178 /* protects napi_hash addition/deletion and napi_gen_id */
179 static DEFINE_SPINLOCK(napi_hash_lock
);
181 static unsigned int napi_gen_id
;
182 static DEFINE_HASHTABLE(napi_hash
, 8);
184 static seqcount_t devnet_rename_seq
;
186 static inline void dev_base_seq_inc(struct net
*net
)
188 while (++net
->dev_base_seq
== 0);
191 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
193 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
195 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
198 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
200 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
203 static inline void rps_lock(struct softnet_data
*sd
)
206 spin_lock(&sd
->input_pkt_queue
.lock
);
210 static inline void rps_unlock(struct softnet_data
*sd
)
213 spin_unlock(&sd
->input_pkt_queue
.lock
);
217 /* Device list insertion */
218 static void list_netdevice(struct net_device
*dev
)
220 struct net
*net
= dev_net(dev
);
224 write_lock_bh(&dev_base_lock
);
225 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
226 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
227 hlist_add_head_rcu(&dev
->index_hlist
,
228 dev_index_hash(net
, dev
->ifindex
));
229 write_unlock_bh(&dev_base_lock
);
231 dev_base_seq_inc(net
);
234 /* Device list removal
235 * caller must respect a RCU grace period before freeing/reusing dev
237 static void unlist_netdevice(struct net_device
*dev
)
241 /* Unlink dev from the device chain */
242 write_lock_bh(&dev_base_lock
);
243 list_del_rcu(&dev
->dev_list
);
244 hlist_del_rcu(&dev
->name_hlist
);
245 hlist_del_rcu(&dev
->index_hlist
);
246 write_unlock_bh(&dev_base_lock
);
248 dev_base_seq_inc(dev_net(dev
));
255 static RAW_NOTIFIER_HEAD(netdev_chain
);
258 * Device drivers call our routines to queue packets here. We empty the
259 * queue in the local softnet handler.
262 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
263 EXPORT_PER_CPU_SYMBOL(softnet_data
);
265 #ifdef CONFIG_LOCKDEP
267 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
268 * according to dev->type
270 static const unsigned short netdev_lock_type
[] =
271 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
272 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
273 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
274 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
275 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
276 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
277 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
278 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
279 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
280 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
281 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
282 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
283 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
284 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
285 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
287 static const char *const netdev_lock_name
[] =
288 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
289 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
290 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
291 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
292 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
293 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
294 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
295 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
296 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
297 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
298 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
299 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
300 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
301 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
302 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
304 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
305 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
307 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
311 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
312 if (netdev_lock_type
[i
] == dev_type
)
314 /* the last key is used by default */
315 return ARRAY_SIZE(netdev_lock_type
) - 1;
318 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
319 unsigned short dev_type
)
323 i
= netdev_lock_pos(dev_type
);
324 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
325 netdev_lock_name
[i
]);
328 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
332 i
= netdev_lock_pos(dev
->type
);
333 lockdep_set_class_and_name(&dev
->addr_list_lock
,
334 &netdev_addr_lock_key
[i
],
335 netdev_lock_name
[i
]);
338 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
339 unsigned short dev_type
)
342 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
347 /*******************************************************************************
349 Protocol management and registration routines
351 *******************************************************************************/
354 * Add a protocol ID to the list. Now that the input handler is
355 * smarter we can dispense with all the messy stuff that used to be
358 * BEWARE!!! Protocol handlers, mangling input packets,
359 * MUST BE last in hash buckets and checking protocol handlers
360 * MUST start from promiscuous ptype_all chain in net_bh.
361 * It is true now, do not change it.
362 * Explanation follows: if protocol handler, mangling packet, will
363 * be the first on list, it is not able to sense, that packet
364 * is cloned and should be copied-on-write, so that it will
365 * change it and subsequent readers will get broken packet.
369 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
371 if (pt
->type
== htons(ETH_P_ALL
))
374 return &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
378 * dev_add_pack - add packet handler
379 * @pt: packet type declaration
381 * Add a protocol handler to the networking stack. The passed &packet_type
382 * is linked into kernel lists and may not be freed until it has been
383 * removed from the kernel lists.
385 * This call does not sleep therefore it can not
386 * guarantee all CPU's that are in middle of receiving packets
387 * will see the new packet type (until the next received packet).
390 void dev_add_pack(struct packet_type
*pt
)
392 struct list_head
*head
= ptype_head(pt
);
394 spin_lock(&ptype_lock
);
395 list_add_rcu(&pt
->list
, head
);
396 spin_unlock(&ptype_lock
);
398 EXPORT_SYMBOL(dev_add_pack
);
401 * __dev_remove_pack - remove packet handler
402 * @pt: packet type declaration
404 * Remove a protocol handler that was previously added to the kernel
405 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
406 * from the kernel lists and can be freed or reused once this function
409 * The packet type might still be in use by receivers
410 * and must not be freed until after all the CPU's have gone
411 * through a quiescent state.
413 void __dev_remove_pack(struct packet_type
*pt
)
415 struct list_head
*head
= ptype_head(pt
);
416 struct packet_type
*pt1
;
418 spin_lock(&ptype_lock
);
420 list_for_each_entry(pt1
, head
, list
) {
422 list_del_rcu(&pt
->list
);
427 pr_warn("dev_remove_pack: %p not found\n", pt
);
429 spin_unlock(&ptype_lock
);
431 EXPORT_SYMBOL(__dev_remove_pack
);
434 * dev_remove_pack - remove packet handler
435 * @pt: packet type declaration
437 * Remove a protocol handler that was previously added to the kernel
438 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
439 * from the kernel lists and can be freed or reused once this function
442 * This call sleeps to guarantee that no CPU is looking at the packet
445 void dev_remove_pack(struct packet_type
*pt
)
447 __dev_remove_pack(pt
);
451 EXPORT_SYMBOL(dev_remove_pack
);
455 * dev_add_offload - register offload handlers
456 * @po: protocol offload declaration
458 * Add protocol offload handlers to the networking stack. The passed
459 * &proto_offload is linked into kernel lists and may not be freed until
460 * it has been removed from the kernel lists.
462 * This call does not sleep therefore it can not
463 * guarantee all CPU's that are in middle of receiving packets
464 * will see the new offload handlers (until the next received packet).
466 void dev_add_offload(struct packet_offload
*po
)
468 struct list_head
*head
= &offload_base
;
470 spin_lock(&offload_lock
);
471 list_add_rcu(&po
->list
, head
);
472 spin_unlock(&offload_lock
);
474 EXPORT_SYMBOL(dev_add_offload
);
477 * __dev_remove_offload - remove offload handler
478 * @po: packet offload declaration
480 * Remove a protocol offload handler that was previously added to the
481 * kernel offload handlers by dev_add_offload(). The passed &offload_type
482 * is removed from the kernel lists and can be freed or reused once this
485 * The packet type might still be in use by receivers
486 * and must not be freed until after all the CPU's have gone
487 * through a quiescent state.
489 static void __dev_remove_offload(struct packet_offload
*po
)
491 struct list_head
*head
= &offload_base
;
492 struct packet_offload
*po1
;
494 spin_lock(&offload_lock
);
496 list_for_each_entry(po1
, head
, list
) {
498 list_del_rcu(&po
->list
);
503 pr_warn("dev_remove_offload: %p not found\n", po
);
505 spin_unlock(&offload_lock
);
509 * dev_remove_offload - remove packet offload handler
510 * @po: packet offload declaration
512 * Remove a packet offload handler that was previously added to the kernel
513 * offload handlers by dev_add_offload(). The passed &offload_type is
514 * removed from the kernel lists and can be freed or reused once this
517 * This call sleeps to guarantee that no CPU is looking at the packet
520 void dev_remove_offload(struct packet_offload
*po
)
522 __dev_remove_offload(po
);
526 EXPORT_SYMBOL(dev_remove_offload
);
528 /******************************************************************************
530 Device Boot-time Settings Routines
532 *******************************************************************************/
534 /* Boot time configuration table */
535 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
538 * netdev_boot_setup_add - add new setup entry
539 * @name: name of the device
540 * @map: configured settings for the device
542 * Adds new setup entry to the dev_boot_setup list. The function
543 * returns 0 on error and 1 on success. This is a generic routine to
546 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
548 struct netdev_boot_setup
*s
;
552 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
553 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
554 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
555 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
556 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
561 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
565 * netdev_boot_setup_check - check boot time settings
566 * @dev: the netdevice
568 * Check boot time settings for the device.
569 * The found settings are set for the device to be used
570 * later in the device probing.
571 * Returns 0 if no settings found, 1 if they are.
573 int netdev_boot_setup_check(struct net_device
*dev
)
575 struct netdev_boot_setup
*s
= dev_boot_setup
;
578 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
579 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
580 !strcmp(dev
->name
, s
[i
].name
)) {
581 dev
->irq
= s
[i
].map
.irq
;
582 dev
->base_addr
= s
[i
].map
.base_addr
;
583 dev
->mem_start
= s
[i
].map
.mem_start
;
584 dev
->mem_end
= s
[i
].map
.mem_end
;
590 EXPORT_SYMBOL(netdev_boot_setup_check
);
594 * netdev_boot_base - get address from boot time settings
595 * @prefix: prefix for network device
596 * @unit: id for network device
598 * Check boot time settings for the base address of device.
599 * The found settings are set for the device to be used
600 * later in the device probing.
601 * Returns 0 if no settings found.
603 unsigned long netdev_boot_base(const char *prefix
, int unit
)
605 const struct netdev_boot_setup
*s
= dev_boot_setup
;
609 sprintf(name
, "%s%d", prefix
, unit
);
612 * If device already registered then return base of 1
613 * to indicate not to probe for this interface
615 if (__dev_get_by_name(&init_net
, name
))
618 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
619 if (!strcmp(name
, s
[i
].name
))
620 return s
[i
].map
.base_addr
;
625 * Saves at boot time configured settings for any netdevice.
627 int __init
netdev_boot_setup(char *str
)
632 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
637 memset(&map
, 0, sizeof(map
));
641 map
.base_addr
= ints
[2];
643 map
.mem_start
= ints
[3];
645 map
.mem_end
= ints
[4];
647 /* Add new entry to the list */
648 return netdev_boot_setup_add(str
, &map
);
651 __setup("netdev=", netdev_boot_setup
);
653 /*******************************************************************************
655 Device Interface Subroutines
657 *******************************************************************************/
660 * __dev_get_by_name - find a device by its name
661 * @net: the applicable net namespace
662 * @name: name to find
664 * Find an interface by name. Must be called under RTNL semaphore
665 * or @dev_base_lock. If the name is found a pointer to the device
666 * is returned. If the name is not found then %NULL is returned. The
667 * reference counters are not incremented so the caller must be
668 * careful with locks.
671 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
673 struct net_device
*dev
;
674 struct hlist_head
*head
= dev_name_hash(net
, name
);
676 hlist_for_each_entry(dev
, head
, name_hlist
)
677 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
682 EXPORT_SYMBOL(__dev_get_by_name
);
685 * dev_get_by_name_rcu - find a device by its name
686 * @net: the applicable net namespace
687 * @name: name to find
689 * Find an interface by name.
690 * If the name is found a pointer to the device is returned.
691 * If the name is not found then %NULL is returned.
692 * The reference counters are not incremented so the caller must be
693 * careful with locks. The caller must hold RCU lock.
696 struct net_device
*dev_get_by_name_rcu(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_rcu(dev
, head
, name_hlist
)
702 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
707 EXPORT_SYMBOL(dev_get_by_name_rcu
);
710 * dev_get_by_name - find a device by its name
711 * @net: the applicable net namespace
712 * @name: name to find
714 * Find an interface by name. This can be called from any
715 * context and does its own locking. The returned handle has
716 * the usage count incremented and the caller must use dev_put() to
717 * release it when it is no longer needed. %NULL is returned if no
718 * matching device is found.
721 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
723 struct net_device
*dev
;
726 dev
= dev_get_by_name_rcu(net
, name
);
732 EXPORT_SYMBOL(dev_get_by_name
);
735 * __dev_get_by_index - find a device by its ifindex
736 * @net: the applicable net namespace
737 * @ifindex: index of device
739 * Search for an interface by index. Returns %NULL if the device
740 * is not found or a pointer to the device. The device has not
741 * had its reference counter increased so the caller must be careful
742 * about locking. The caller must hold either the RTNL semaphore
746 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
748 struct net_device
*dev
;
749 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
751 hlist_for_each_entry(dev
, head
, index_hlist
)
752 if (dev
->ifindex
== ifindex
)
757 EXPORT_SYMBOL(__dev_get_by_index
);
760 * dev_get_by_index_rcu - 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 RCU lock.
770 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
772 struct net_device
*dev
;
773 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
775 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
776 if (dev
->ifindex
== ifindex
)
781 EXPORT_SYMBOL(dev_get_by_index_rcu
);
785 * dev_get_by_index - 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 returned has
791 * had a reference added and the pointer is safe until the user calls
792 * dev_put to indicate they have finished with it.
795 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
797 struct net_device
*dev
;
800 dev
= dev_get_by_index_rcu(net
, ifindex
);
806 EXPORT_SYMBOL(dev_get_by_index
);
809 * netdev_get_name - get a netdevice name, knowing its ifindex.
810 * @net: network namespace
811 * @name: a pointer to the buffer where the name will be stored.
812 * @ifindex: the ifindex of the interface to get the name from.
814 * The use of raw_seqcount_begin() and cond_resched() before
815 * retrying is required as we want to give the writers a chance
816 * to complete when CONFIG_PREEMPT is not set.
818 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
820 struct net_device
*dev
;
824 seq
= raw_seqcount_begin(&devnet_rename_seq
);
826 dev
= dev_get_by_index_rcu(net
, ifindex
);
832 strcpy(name
, dev
->name
);
834 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
843 * dev_getbyhwaddr_rcu - find a device by its hardware address
844 * @net: the applicable net namespace
845 * @type: media type of device
846 * @ha: hardware address
848 * Search for an interface by MAC address. Returns NULL if the device
849 * is not found or a pointer to the device.
850 * The caller must hold RCU or RTNL.
851 * The returned device has not had its ref count increased
852 * and the caller must therefore be careful about locking
856 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
859 struct net_device
*dev
;
861 for_each_netdev_rcu(net
, dev
)
862 if (dev
->type
== type
&&
863 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
868 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
870 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
872 struct net_device
*dev
;
875 for_each_netdev(net
, dev
)
876 if (dev
->type
== type
)
881 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
883 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
885 struct net_device
*dev
, *ret
= NULL
;
888 for_each_netdev_rcu(net
, dev
)
889 if (dev
->type
== type
) {
897 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
900 * dev_get_by_flags_rcu - find any device with given flags
901 * @net: the applicable net namespace
902 * @if_flags: IFF_* values
903 * @mask: bitmask of bits in if_flags to check
905 * Search for any interface with the given flags. Returns NULL if a device
906 * is not found or a pointer to the device. Must be called inside
907 * rcu_read_lock(), and result refcount is unchanged.
910 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
913 struct net_device
*dev
, *ret
;
916 for_each_netdev_rcu(net
, dev
) {
917 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
924 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
927 * dev_valid_name - check if name is okay for network device
930 * Network device names need to be valid file names to
931 * to allow sysfs to work. We also disallow any kind of
934 bool dev_valid_name(const char *name
)
938 if (strlen(name
) >= IFNAMSIZ
)
940 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
944 if (*name
== '/' || isspace(*name
))
950 EXPORT_SYMBOL(dev_valid_name
);
953 * __dev_alloc_name - allocate a name for a device
954 * @net: network namespace to allocate the device name in
955 * @name: name format string
956 * @buf: scratch buffer and result name string
958 * Passed a format string - eg "lt%d" it will try and find a suitable
959 * id. It scans list of devices to build up a free map, then chooses
960 * the first empty slot. The caller must hold the dev_base or rtnl lock
961 * while allocating the name and adding the device in order to avoid
963 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
964 * Returns the number of the unit assigned or a negative errno code.
967 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
971 const int max_netdevices
= 8*PAGE_SIZE
;
972 unsigned long *inuse
;
973 struct net_device
*d
;
975 p
= strnchr(name
, IFNAMSIZ
-1, '%');
978 * Verify the string as this thing may have come from
979 * the user. There must be either one "%d" and no other "%"
982 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
985 /* Use one page as a bit array of possible slots */
986 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
990 for_each_netdev(net
, d
) {
991 if (!sscanf(d
->name
, name
, &i
))
993 if (i
< 0 || i
>= max_netdevices
)
996 /* avoid cases where sscanf is not exact inverse of printf */
997 snprintf(buf
, IFNAMSIZ
, name
, i
);
998 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
1002 i
= find_first_zero_bit(inuse
, max_netdevices
);
1003 free_page((unsigned long) inuse
);
1007 snprintf(buf
, IFNAMSIZ
, name
, i
);
1008 if (!__dev_get_by_name(net
, buf
))
1011 /* It is possible to run out of possible slots
1012 * when the name is long and there isn't enough space left
1013 * for the digits, or if all bits are used.
1019 * dev_alloc_name - allocate a name for a device
1021 * @name: name format string
1023 * Passed a format string - eg "lt%d" it will try and find a suitable
1024 * id. It scans list of devices to build up a free map, then chooses
1025 * the first empty slot. The caller must hold the dev_base or rtnl lock
1026 * while allocating the name and adding the device in order to avoid
1028 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1029 * Returns the number of the unit assigned or a negative errno code.
1032 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1038 BUG_ON(!dev_net(dev
));
1040 ret
= __dev_alloc_name(net
, name
, buf
);
1042 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1045 EXPORT_SYMBOL(dev_alloc_name
);
1047 static int dev_alloc_name_ns(struct net
*net
,
1048 struct net_device
*dev
,
1054 ret
= __dev_alloc_name(net
, name
, buf
);
1056 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1060 static int dev_get_valid_name(struct net
*net
,
1061 struct net_device
*dev
,
1066 if (!dev_valid_name(name
))
1069 if (strchr(name
, '%'))
1070 return dev_alloc_name_ns(net
, dev
, name
);
1071 else if (__dev_get_by_name(net
, name
))
1073 else if (dev
->name
!= name
)
1074 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1080 * dev_change_name - change name of a device
1082 * @newname: name (or format string) must be at least IFNAMSIZ
1084 * Change name of a device, can pass format strings "eth%d".
1087 int dev_change_name(struct net_device
*dev
, const char *newname
)
1089 unsigned char old_assign_type
;
1090 char oldname
[IFNAMSIZ
];
1096 BUG_ON(!dev_net(dev
));
1099 if (dev
->flags
& IFF_UP
)
1102 write_seqcount_begin(&devnet_rename_seq
);
1104 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1105 write_seqcount_end(&devnet_rename_seq
);
1109 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1111 err
= dev_get_valid_name(net
, dev
, newname
);
1113 write_seqcount_end(&devnet_rename_seq
);
1117 if (oldname
[0] && !strchr(oldname
, '%'))
1118 netdev_info(dev
, "renamed from %s\n", oldname
);
1120 old_assign_type
= dev
->name_assign_type
;
1121 dev
->name_assign_type
= NET_NAME_RENAMED
;
1124 ret
= device_rename(&dev
->dev
, dev
->name
);
1126 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1127 dev
->name_assign_type
= old_assign_type
;
1128 write_seqcount_end(&devnet_rename_seq
);
1132 write_seqcount_end(&devnet_rename_seq
);
1134 netdev_adjacent_rename_links(dev
, oldname
);
1136 write_lock_bh(&dev_base_lock
);
1137 hlist_del_rcu(&dev
->name_hlist
);
1138 write_unlock_bh(&dev_base_lock
);
1142 write_lock_bh(&dev_base_lock
);
1143 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1144 write_unlock_bh(&dev_base_lock
);
1146 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1147 ret
= notifier_to_errno(ret
);
1150 /* err >= 0 after dev_alloc_name() or stores the first errno */
1153 write_seqcount_begin(&devnet_rename_seq
);
1154 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1155 memcpy(oldname
, newname
, IFNAMSIZ
);
1156 dev
->name_assign_type
= old_assign_type
;
1157 old_assign_type
= NET_NAME_RENAMED
;
1160 pr_err("%s: name change rollback failed: %d\n",
1169 * dev_set_alias - change ifalias of a device
1171 * @alias: name up to IFALIASZ
1172 * @len: limit of bytes to copy from info
1174 * Set ifalias for a device,
1176 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1182 if (len
>= IFALIASZ
)
1186 kfree(dev
->ifalias
);
1187 dev
->ifalias
= NULL
;
1191 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1194 dev
->ifalias
= new_ifalias
;
1196 strlcpy(dev
->ifalias
, alias
, len
+1);
1202 * netdev_features_change - device changes features
1203 * @dev: device to cause notification
1205 * Called to indicate a device has changed features.
1207 void netdev_features_change(struct net_device
*dev
)
1209 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1211 EXPORT_SYMBOL(netdev_features_change
);
1214 * netdev_state_change - device changes state
1215 * @dev: device to cause notification
1217 * Called to indicate a device has changed state. This function calls
1218 * the notifier chains for netdev_chain and sends a NEWLINK message
1219 * to the routing socket.
1221 void netdev_state_change(struct net_device
*dev
)
1223 if (dev
->flags
& IFF_UP
) {
1224 struct netdev_notifier_change_info change_info
;
1226 change_info
.flags_changed
= 0;
1227 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
1229 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1232 EXPORT_SYMBOL(netdev_state_change
);
1235 * netdev_notify_peers - notify network peers about existence of @dev
1236 * @dev: network device
1238 * Generate traffic such that interested network peers are aware of
1239 * @dev, such as by generating a gratuitous ARP. This may be used when
1240 * a device wants to inform the rest of the network about some sort of
1241 * reconfiguration such as a failover event or virtual machine
1244 void netdev_notify_peers(struct net_device
*dev
)
1247 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1250 EXPORT_SYMBOL(netdev_notify_peers
);
1252 static int __dev_open(struct net_device
*dev
)
1254 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1259 if (!netif_device_present(dev
))
1262 /* Block netpoll from trying to do any rx path servicing.
1263 * If we don't do this there is a chance ndo_poll_controller
1264 * or ndo_poll may be running while we open the device
1266 netpoll_poll_disable(dev
);
1268 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1269 ret
= notifier_to_errno(ret
);
1273 set_bit(__LINK_STATE_START
, &dev
->state
);
1275 if (ops
->ndo_validate_addr
)
1276 ret
= ops
->ndo_validate_addr(dev
);
1278 if (!ret
&& ops
->ndo_open
)
1279 ret
= ops
->ndo_open(dev
);
1281 netpoll_poll_enable(dev
);
1284 clear_bit(__LINK_STATE_START
, &dev
->state
);
1286 dev
->flags
|= IFF_UP
;
1287 net_dmaengine_get();
1288 dev_set_rx_mode(dev
);
1290 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1297 * dev_open - prepare an interface for use.
1298 * @dev: device to open
1300 * Takes a device from down to up state. The device's private open
1301 * function is invoked and then the multicast lists are loaded. Finally
1302 * the device is moved into the up state and a %NETDEV_UP message is
1303 * sent to the netdev notifier chain.
1305 * Calling this function on an active interface is a nop. On a failure
1306 * a negative errno code is returned.
1308 int dev_open(struct net_device
*dev
)
1312 if (dev
->flags
& IFF_UP
)
1315 ret
= __dev_open(dev
);
1319 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1320 call_netdevice_notifiers(NETDEV_UP
, dev
);
1324 EXPORT_SYMBOL(dev_open
);
1326 static int __dev_close_many(struct list_head
*head
)
1328 struct net_device
*dev
;
1333 list_for_each_entry(dev
, head
, close_list
) {
1334 /* Temporarily disable netpoll until the interface is down */
1335 netpoll_poll_disable(dev
);
1337 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1339 clear_bit(__LINK_STATE_START
, &dev
->state
);
1341 /* Synchronize to scheduled poll. We cannot touch poll list, it
1342 * can be even on different cpu. So just clear netif_running().
1344 * dev->stop() will invoke napi_disable() on all of it's
1345 * napi_struct instances on this device.
1347 smp_mb__after_atomic(); /* Commit netif_running(). */
1350 dev_deactivate_many(head
);
1352 list_for_each_entry(dev
, head
, close_list
) {
1353 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1356 * Call the device specific close. This cannot fail.
1357 * Only if device is UP
1359 * We allow it to be called even after a DETACH hot-plug
1365 dev
->flags
&= ~IFF_UP
;
1366 net_dmaengine_put();
1367 netpoll_poll_enable(dev
);
1373 static int __dev_close(struct net_device
*dev
)
1378 list_add(&dev
->close_list
, &single
);
1379 retval
= __dev_close_many(&single
);
1385 static int dev_close_many(struct list_head
*head
)
1387 struct net_device
*dev
, *tmp
;
1389 /* Remove the devices that don't need to be closed */
1390 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1391 if (!(dev
->flags
& IFF_UP
))
1392 list_del_init(&dev
->close_list
);
1394 __dev_close_many(head
);
1396 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1397 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1398 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1399 list_del_init(&dev
->close_list
);
1406 * dev_close - shutdown an interface.
1407 * @dev: device to shutdown
1409 * This function moves an active device into down state. A
1410 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1411 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1414 int dev_close(struct net_device
*dev
)
1416 if (dev
->flags
& IFF_UP
) {
1419 list_add(&dev
->close_list
, &single
);
1420 dev_close_many(&single
);
1425 EXPORT_SYMBOL(dev_close
);
1429 * dev_disable_lro - disable Large Receive Offload on a device
1432 * Disable Large Receive Offload (LRO) on a net device. Must be
1433 * called under RTNL. This is needed if received packets may be
1434 * forwarded to another interface.
1436 void dev_disable_lro(struct net_device
*dev
)
1439 * If we're trying to disable lro on a vlan device
1440 * use the underlying physical device instead
1442 if (is_vlan_dev(dev
))
1443 dev
= vlan_dev_real_dev(dev
);
1445 /* the same for macvlan devices */
1446 if (netif_is_macvlan(dev
))
1447 dev
= macvlan_dev_real_dev(dev
);
1449 dev
->wanted_features
&= ~NETIF_F_LRO
;
1450 netdev_update_features(dev
);
1452 if (unlikely(dev
->features
& NETIF_F_LRO
))
1453 netdev_WARN(dev
, "failed to disable LRO!\n");
1455 EXPORT_SYMBOL(dev_disable_lro
);
1457 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1458 struct net_device
*dev
)
1460 struct netdev_notifier_info info
;
1462 netdev_notifier_info_init(&info
, dev
);
1463 return nb
->notifier_call(nb
, val
, &info
);
1466 static int dev_boot_phase
= 1;
1469 * register_netdevice_notifier - register a network notifier block
1472 * Register a notifier to be called when network device events occur.
1473 * The notifier passed is linked into the kernel structures and must
1474 * not be reused until it has been unregistered. A negative errno code
1475 * is returned on a failure.
1477 * When registered all registration and up events are replayed
1478 * to the new notifier to allow device to have a race free
1479 * view of the network device list.
1482 int register_netdevice_notifier(struct notifier_block
*nb
)
1484 struct net_device
*dev
;
1485 struct net_device
*last
;
1490 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1496 for_each_netdev(net
, dev
) {
1497 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1498 err
= notifier_to_errno(err
);
1502 if (!(dev
->flags
& IFF_UP
))
1505 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1516 for_each_netdev(net
, dev
) {
1520 if (dev
->flags
& IFF_UP
) {
1521 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1523 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1525 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1530 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1533 EXPORT_SYMBOL(register_netdevice_notifier
);
1536 * unregister_netdevice_notifier - unregister a network notifier block
1539 * Unregister a notifier previously registered by
1540 * register_netdevice_notifier(). The notifier is unlinked into the
1541 * kernel structures and may then be reused. A negative errno code
1542 * is returned on a failure.
1544 * After unregistering unregister and down device events are synthesized
1545 * for all devices on the device list to the removed notifier to remove
1546 * the need for special case cleanup code.
1549 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1551 struct net_device
*dev
;
1556 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1561 for_each_netdev(net
, dev
) {
1562 if (dev
->flags
& IFF_UP
) {
1563 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1565 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1567 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1574 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1577 * call_netdevice_notifiers_info - call all network notifier blocks
1578 * @val: value passed unmodified to notifier function
1579 * @dev: net_device pointer passed unmodified to notifier function
1580 * @info: notifier information data
1582 * Call all network notifier blocks. Parameters and return value
1583 * are as for raw_notifier_call_chain().
1586 static int call_netdevice_notifiers_info(unsigned long val
,
1587 struct net_device
*dev
,
1588 struct netdev_notifier_info
*info
)
1591 netdev_notifier_info_init(info
, dev
);
1592 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1596 * call_netdevice_notifiers - call all network notifier blocks
1597 * @val: value passed unmodified to notifier function
1598 * @dev: net_device pointer passed unmodified to notifier function
1600 * Call all network notifier blocks. Parameters and return value
1601 * are as for raw_notifier_call_chain().
1604 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1606 struct netdev_notifier_info info
;
1608 return call_netdevice_notifiers_info(val
, dev
, &info
);
1610 EXPORT_SYMBOL(call_netdevice_notifiers
);
1612 static struct static_key netstamp_needed __read_mostly
;
1613 #ifdef HAVE_JUMP_LABEL
1614 /* We are not allowed to call static_key_slow_dec() from irq context
1615 * If net_disable_timestamp() is called from irq context, defer the
1616 * static_key_slow_dec() calls.
1618 static atomic_t netstamp_needed_deferred
;
1621 void net_enable_timestamp(void)
1623 #ifdef HAVE_JUMP_LABEL
1624 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1628 static_key_slow_dec(&netstamp_needed
);
1632 static_key_slow_inc(&netstamp_needed
);
1634 EXPORT_SYMBOL(net_enable_timestamp
);
1636 void net_disable_timestamp(void)
1638 #ifdef HAVE_JUMP_LABEL
1639 if (in_interrupt()) {
1640 atomic_inc(&netstamp_needed_deferred
);
1644 static_key_slow_dec(&netstamp_needed
);
1646 EXPORT_SYMBOL(net_disable_timestamp
);
1648 static inline void net_timestamp_set(struct sk_buff
*skb
)
1650 skb
->tstamp
.tv64
= 0;
1651 if (static_key_false(&netstamp_needed
))
1652 __net_timestamp(skb
);
1655 #define net_timestamp_check(COND, SKB) \
1656 if (static_key_false(&netstamp_needed)) { \
1657 if ((COND) && !(SKB)->tstamp.tv64) \
1658 __net_timestamp(SKB); \
1661 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1665 if (!(dev
->flags
& IFF_UP
))
1668 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1669 if (skb
->len
<= len
)
1672 /* if TSO is enabled, we don't care about the length as the packet
1673 * could be forwarded without being segmented before
1675 if (skb_is_gso(skb
))
1680 EXPORT_SYMBOL_GPL(is_skb_forwardable
);
1682 int __dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1684 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1685 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1686 atomic_long_inc(&dev
->rx_dropped
);
1692 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1693 atomic_long_inc(&dev
->rx_dropped
);
1698 skb_scrub_packet(skb
, true);
1699 skb
->protocol
= eth_type_trans(skb
, dev
);
1703 EXPORT_SYMBOL_GPL(__dev_forward_skb
);
1706 * dev_forward_skb - loopback an skb to another netif
1708 * @dev: destination network device
1709 * @skb: buffer to forward
1712 * NET_RX_SUCCESS (no congestion)
1713 * NET_RX_DROP (packet was dropped, but freed)
1715 * dev_forward_skb can be used for injecting an skb from the
1716 * start_xmit function of one device into the receive queue
1717 * of another device.
1719 * The receiving device may be in another namespace, so
1720 * we have to clear all information in the skb that could
1721 * impact namespace isolation.
1723 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1725 return __dev_forward_skb(dev
, skb
) ?: netif_rx_internal(skb
);
1727 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1729 static inline int deliver_skb(struct sk_buff
*skb
,
1730 struct packet_type
*pt_prev
,
1731 struct net_device
*orig_dev
)
1733 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1735 atomic_inc(&skb
->users
);
1736 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1739 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1741 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1744 if (ptype
->id_match
)
1745 return ptype
->id_match(ptype
, skb
->sk
);
1746 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1753 * Support routine. Sends outgoing frames to any network
1754 * taps currently in use.
1757 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1759 struct packet_type
*ptype
;
1760 struct sk_buff
*skb2
= NULL
;
1761 struct packet_type
*pt_prev
= NULL
;
1764 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1765 /* Never send packets back to the socket
1766 * they originated from - MvS (miquels@drinkel.ow.org)
1768 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1769 (!skb_loop_sk(ptype
, skb
))) {
1771 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1776 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1780 net_timestamp_set(skb2
);
1782 /* skb->nh should be correctly
1783 set by sender, so that the second statement is
1784 just protection against buggy protocols.
1786 skb_reset_mac_header(skb2
);
1788 if (skb_network_header(skb2
) < skb2
->data
||
1789 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1790 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1791 ntohs(skb2
->protocol
),
1793 skb_reset_network_header(skb2
);
1796 skb2
->transport_header
= skb2
->network_header
;
1797 skb2
->pkt_type
= PACKET_OUTGOING
;
1802 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1807 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1808 * @dev: Network device
1809 * @txq: number of queues available
1811 * If real_num_tx_queues is changed the tc mappings may no longer be
1812 * valid. To resolve this verify the tc mapping remains valid and if
1813 * not NULL the mapping. With no priorities mapping to this
1814 * offset/count pair it will no longer be used. In the worst case TC0
1815 * is invalid nothing can be done so disable priority mappings. If is
1816 * expected that drivers will fix this mapping if they can before
1817 * calling netif_set_real_num_tx_queues.
1819 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1822 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1824 /* If TC0 is invalidated disable TC mapping */
1825 if (tc
->offset
+ tc
->count
> txq
) {
1826 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1831 /* Invalidated prio to tc mappings set to TC0 */
1832 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1833 int q
= netdev_get_prio_tc_map(dev
, i
);
1835 tc
= &dev
->tc_to_txq
[q
];
1836 if (tc
->offset
+ tc
->count
> txq
) {
1837 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1839 netdev_set_prio_tc_map(dev
, i
, 0);
1845 static DEFINE_MUTEX(xps_map_mutex
);
1846 #define xmap_dereference(P) \
1847 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1849 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1852 struct xps_map
*map
= NULL
;
1856 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1858 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1859 if (map
->queues
[pos
] == index
) {
1861 map
->queues
[pos
] = map
->queues
[--map
->len
];
1863 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1864 kfree_rcu(map
, rcu
);
1874 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1876 struct xps_dev_maps
*dev_maps
;
1878 bool active
= false;
1880 mutex_lock(&xps_map_mutex
);
1881 dev_maps
= xmap_dereference(dev
->xps_maps
);
1886 for_each_possible_cpu(cpu
) {
1887 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1888 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1891 if (i
== dev
->num_tx_queues
)
1896 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1897 kfree_rcu(dev_maps
, rcu
);
1900 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1901 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1905 mutex_unlock(&xps_map_mutex
);
1908 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1911 struct xps_map
*new_map
;
1912 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1915 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1916 if (map
->queues
[pos
] != index
)
1921 /* Need to add queue to this CPU's existing map */
1923 if (pos
< map
->alloc_len
)
1926 alloc_len
= map
->alloc_len
* 2;
1929 /* Need to allocate new map to store queue on this CPU's map */
1930 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1935 for (i
= 0; i
< pos
; i
++)
1936 new_map
->queues
[i
] = map
->queues
[i
];
1937 new_map
->alloc_len
= alloc_len
;
1943 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
1946 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
1947 struct xps_map
*map
, *new_map
;
1948 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
1949 int cpu
, numa_node_id
= -2;
1950 bool active
= false;
1952 mutex_lock(&xps_map_mutex
);
1954 dev_maps
= xmap_dereference(dev
->xps_maps
);
1956 /* allocate memory for queue storage */
1957 for_each_online_cpu(cpu
) {
1958 if (!cpumask_test_cpu(cpu
, mask
))
1962 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
1963 if (!new_dev_maps
) {
1964 mutex_unlock(&xps_map_mutex
);
1968 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1971 map
= expand_xps_map(map
, cpu
, index
);
1975 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1979 goto out_no_new_maps
;
1981 for_each_possible_cpu(cpu
) {
1982 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
1983 /* add queue to CPU maps */
1986 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1987 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
1990 if (pos
== map
->len
)
1991 map
->queues
[map
->len
++] = index
;
1993 if (numa_node_id
== -2)
1994 numa_node_id
= cpu_to_node(cpu
);
1995 else if (numa_node_id
!= cpu_to_node(cpu
))
1998 } else if (dev_maps
) {
1999 /* fill in the new device map from the old device map */
2000 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2001 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2006 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
2008 /* Cleanup old maps */
2010 for_each_possible_cpu(cpu
) {
2011 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2012 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2013 if (map
&& map
!= new_map
)
2014 kfree_rcu(map
, rcu
);
2017 kfree_rcu(dev_maps
, rcu
);
2020 dev_maps
= new_dev_maps
;
2024 /* update Tx queue numa node */
2025 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2026 (numa_node_id
>= 0) ? numa_node_id
:
2032 /* removes queue from unused CPUs */
2033 for_each_possible_cpu(cpu
) {
2034 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2037 if (remove_xps_queue(dev_maps
, cpu
, index
))
2041 /* free map if not active */
2043 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2044 kfree_rcu(dev_maps
, rcu
);
2048 mutex_unlock(&xps_map_mutex
);
2052 /* remove any maps that we added */
2053 for_each_possible_cpu(cpu
) {
2054 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2055 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2057 if (new_map
&& new_map
!= map
)
2061 mutex_unlock(&xps_map_mutex
);
2063 kfree(new_dev_maps
);
2066 EXPORT_SYMBOL(netif_set_xps_queue
);
2070 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2071 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2073 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2077 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2080 if (dev
->reg_state
== NETREG_REGISTERED
||
2081 dev
->reg_state
== NETREG_UNREGISTERING
) {
2084 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2090 netif_setup_tc(dev
, txq
);
2092 if (txq
< dev
->real_num_tx_queues
) {
2093 qdisc_reset_all_tx_gt(dev
, txq
);
2095 netif_reset_xps_queues_gt(dev
, txq
);
2100 dev
->real_num_tx_queues
= txq
;
2103 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2107 * netif_set_real_num_rx_queues - set actual number of RX queues used
2108 * @dev: Network device
2109 * @rxq: Actual number of RX queues
2111 * This must be called either with the rtnl_lock held or before
2112 * registration of the net device. Returns 0 on success, or a
2113 * negative error code. If called before registration, it always
2116 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2120 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2123 if (dev
->reg_state
== NETREG_REGISTERED
) {
2126 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2132 dev
->real_num_rx_queues
= rxq
;
2135 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2139 * netif_get_num_default_rss_queues - default number of RSS queues
2141 * This routine should set an upper limit on the number of RSS queues
2142 * used by default by multiqueue devices.
2144 int netif_get_num_default_rss_queues(void)
2146 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2148 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2150 static inline void __netif_reschedule(struct Qdisc
*q
)
2152 struct softnet_data
*sd
;
2153 unsigned long flags
;
2155 local_irq_save(flags
);
2156 sd
= &__get_cpu_var(softnet_data
);
2157 q
->next_sched
= NULL
;
2158 *sd
->output_queue_tailp
= q
;
2159 sd
->output_queue_tailp
= &q
->next_sched
;
2160 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2161 local_irq_restore(flags
);
2164 void __netif_schedule(struct Qdisc
*q
)
2166 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2167 __netif_reschedule(q
);
2169 EXPORT_SYMBOL(__netif_schedule
);
2171 struct dev_kfree_skb_cb
{
2172 enum skb_free_reason reason
;
2175 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2177 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2180 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2182 unsigned long flags
;
2184 if (likely(atomic_read(&skb
->users
) == 1)) {
2186 atomic_set(&skb
->users
, 0);
2187 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2190 get_kfree_skb_cb(skb
)->reason
= reason
;
2191 local_irq_save(flags
);
2192 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2193 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2194 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2195 local_irq_restore(flags
);
2197 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2199 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2201 if (in_irq() || irqs_disabled())
2202 __dev_kfree_skb_irq(skb
, reason
);
2206 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2210 * netif_device_detach - mark device as removed
2211 * @dev: network device
2213 * Mark device as removed from system and therefore no longer available.
2215 void netif_device_detach(struct net_device
*dev
)
2217 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2218 netif_running(dev
)) {
2219 netif_tx_stop_all_queues(dev
);
2222 EXPORT_SYMBOL(netif_device_detach
);
2225 * netif_device_attach - mark device as attached
2226 * @dev: network device
2228 * Mark device as attached from system and restart if needed.
2230 void netif_device_attach(struct net_device
*dev
)
2232 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2233 netif_running(dev
)) {
2234 netif_tx_wake_all_queues(dev
);
2235 __netdev_watchdog_up(dev
);
2238 EXPORT_SYMBOL(netif_device_attach
);
2240 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2242 static const netdev_features_t null_features
= 0;
2243 struct net_device
*dev
= skb
->dev
;
2244 const char *driver
= "";
2246 if (!net_ratelimit())
2249 if (dev
&& dev
->dev
.parent
)
2250 driver
= dev_driver_string(dev
->dev
.parent
);
2252 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2253 "gso_type=%d ip_summed=%d\n",
2254 driver
, dev
? &dev
->features
: &null_features
,
2255 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2256 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2257 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2261 * Invalidate hardware checksum when packet is to be mangled, and
2262 * complete checksum manually on outgoing path.
2264 int skb_checksum_help(struct sk_buff
*skb
)
2267 int ret
= 0, offset
;
2269 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2270 goto out_set_summed
;
2272 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2273 skb_warn_bad_offload(skb
);
2277 /* Before computing a checksum, we should make sure no frag could
2278 * be modified by an external entity : checksum could be wrong.
2280 if (skb_has_shared_frag(skb
)) {
2281 ret
= __skb_linearize(skb
);
2286 offset
= skb_checksum_start_offset(skb
);
2287 BUG_ON(offset
>= skb_headlen(skb
));
2288 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2290 offset
+= skb
->csum_offset
;
2291 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2293 if (skb_cloned(skb
) &&
2294 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2295 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2300 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2302 skb
->ip_summed
= CHECKSUM_NONE
;
2306 EXPORT_SYMBOL(skb_checksum_help
);
2308 __be16
skb_network_protocol(struct sk_buff
*skb
, int *depth
)
2310 unsigned int vlan_depth
= skb
->mac_len
;
2311 __be16 type
= skb
->protocol
;
2313 /* Tunnel gso handlers can set protocol to ethernet. */
2314 if (type
== htons(ETH_P_TEB
)) {
2317 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2320 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2321 type
= eth
->h_proto
;
2324 /* if skb->protocol is 802.1Q/AD then the header should already be
2325 * present at mac_len - VLAN_HLEN (if mac_len > 0), or at
2326 * ETH_HLEN otherwise
2328 if (type
== htons(ETH_P_8021Q
) || type
== htons(ETH_P_8021AD
)) {
2330 if (WARN_ON(vlan_depth
< VLAN_HLEN
))
2332 vlan_depth
-= VLAN_HLEN
;
2334 vlan_depth
= ETH_HLEN
;
2337 struct vlan_hdr
*vh
;
2339 if (unlikely(!pskb_may_pull(skb
,
2340 vlan_depth
+ VLAN_HLEN
)))
2343 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
2344 type
= vh
->h_vlan_encapsulated_proto
;
2345 vlan_depth
+= VLAN_HLEN
;
2346 } while (type
== htons(ETH_P_8021Q
) ||
2347 type
== htons(ETH_P_8021AD
));
2350 *depth
= vlan_depth
;
2356 * skb_mac_gso_segment - mac layer segmentation handler.
2357 * @skb: buffer to segment
2358 * @features: features for the output path (see dev->features)
2360 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2361 netdev_features_t features
)
2363 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2364 struct packet_offload
*ptype
;
2365 int vlan_depth
= skb
->mac_len
;
2366 __be16 type
= skb_network_protocol(skb
, &vlan_depth
);
2368 if (unlikely(!type
))
2369 return ERR_PTR(-EINVAL
);
2371 __skb_pull(skb
, vlan_depth
);
2374 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2375 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2376 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2379 err
= ptype
->callbacks
.gso_send_check(skb
);
2380 segs
= ERR_PTR(err
);
2381 if (err
|| skb_gso_ok(skb
, features
))
2383 __skb_push(skb
, (skb
->data
-
2384 skb_network_header(skb
)));
2386 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2392 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2396 EXPORT_SYMBOL(skb_mac_gso_segment
);
2399 /* openvswitch calls this on rx path, so we need a different check.
2401 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2404 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2406 return skb
->ip_summed
== CHECKSUM_NONE
;
2410 * __skb_gso_segment - Perform segmentation on skb.
2411 * @skb: buffer to segment
2412 * @features: features for the output path (see dev->features)
2413 * @tx_path: whether it is called in TX path
2415 * This function segments the given skb and returns a list of segments.
2417 * It may return NULL if the skb requires no segmentation. This is
2418 * only possible when GSO is used for verifying header integrity.
2420 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2421 netdev_features_t features
, bool tx_path
)
2423 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2426 skb_warn_bad_offload(skb
);
2428 err
= skb_cow_head(skb
, 0);
2430 return ERR_PTR(err
);
2433 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2434 SKB_GSO_CB(skb
)->encap_level
= 0;
2436 skb_reset_mac_header(skb
);
2437 skb_reset_mac_len(skb
);
2439 return skb_mac_gso_segment(skb
, features
);
2441 EXPORT_SYMBOL(__skb_gso_segment
);
2443 /* Take action when hardware reception checksum errors are detected. */
2445 void netdev_rx_csum_fault(struct net_device
*dev
)
2447 if (net_ratelimit()) {
2448 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2452 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2455 /* Actually, we should eliminate this check as soon as we know, that:
2456 * 1. IOMMU is present and allows to map all the memory.
2457 * 2. No high memory really exists on this machine.
2460 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2462 #ifdef CONFIG_HIGHMEM
2464 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2465 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2466 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2467 if (PageHighMem(skb_frag_page(frag
)))
2472 if (PCI_DMA_BUS_IS_PHYS
) {
2473 struct device
*pdev
= dev
->dev
.parent
;
2477 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2478 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2479 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2480 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2489 void (*destructor
)(struct sk_buff
*skb
);
2492 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2494 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2496 struct dev_gso_cb
*cb
;
2498 kfree_skb_list(skb
->next
);
2501 cb
= DEV_GSO_CB(skb
);
2503 cb
->destructor(skb
);
2507 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2508 * @skb: buffer to segment
2509 * @features: device features as applicable to this skb
2511 * This function segments the given skb and stores the list of segments
2514 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2516 struct sk_buff
*segs
;
2518 segs
= skb_gso_segment(skb
, features
);
2520 /* Verifying header integrity only. */
2525 return PTR_ERR(segs
);
2528 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2529 skb
->destructor
= dev_gso_skb_destructor
;
2534 /* If MPLS offload request, verify we are testing hardware MPLS features
2535 * instead of standard features for the netdev.
2537 #ifdef CONFIG_NET_MPLS_GSO
2538 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2539 netdev_features_t features
,
2542 if (type
== htons(ETH_P_MPLS_UC
) || type
== htons(ETH_P_MPLS_MC
))
2543 features
&= skb
->dev
->mpls_features
;
2548 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2549 netdev_features_t features
,
2556 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2557 netdev_features_t features
)
2562 type
= skb_network_protocol(skb
, &tmp
);
2563 features
= net_mpls_features(skb
, features
, type
);
2565 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2566 !can_checksum_protocol(features
, type
)) {
2567 features
&= ~NETIF_F_ALL_CSUM
;
2568 } else if (illegal_highdma(skb
->dev
, skb
)) {
2569 features
&= ~NETIF_F_SG
;
2575 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2577 __be16 protocol
= skb
->protocol
;
2578 netdev_features_t features
= skb
->dev
->features
;
2580 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2581 features
&= ~NETIF_F_GSO_MASK
;
2583 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
)) {
2584 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2585 protocol
= veh
->h_vlan_encapsulated_proto
;
2586 } else if (!vlan_tx_tag_present(skb
)) {
2587 return harmonize_features(skb
, features
);
2590 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_CTAG_TX
|
2591 NETIF_F_HW_VLAN_STAG_TX
);
2593 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
))
2594 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2595 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_CTAG_TX
|
2596 NETIF_F_HW_VLAN_STAG_TX
;
2598 return harmonize_features(skb
, features
);
2600 EXPORT_SYMBOL(netif_skb_features
);
2602 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2603 struct netdev_queue
*txq
)
2605 int rc
= NETDEV_TX_OK
;
2606 unsigned int skb_len
;
2608 if (likely(!skb
->next
)) {
2609 netdev_features_t features
;
2612 * If device doesn't need skb->dst, release it right now while
2613 * its hot in this cpu cache
2615 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2618 features
= netif_skb_features(skb
);
2620 if (vlan_tx_tag_present(skb
) &&
2621 !vlan_hw_offload_capable(features
, skb
->vlan_proto
)) {
2622 skb
= __vlan_put_tag(skb
, skb
->vlan_proto
,
2623 vlan_tx_tag_get(skb
));
2630 /* If encapsulation offload request, verify we are testing
2631 * hardware encapsulation features instead of standard
2632 * features for the netdev
2634 if (skb
->encapsulation
)
2635 features
&= dev
->hw_enc_features
;
2637 if (netif_needs_gso(skb
, features
)) {
2638 if (unlikely(dev_gso_segment(skb
, features
)))
2643 if (skb_needs_linearize(skb
, features
) &&
2644 __skb_linearize(skb
))
2647 /* If packet is not checksummed and device does not
2648 * support checksumming for this protocol, complete
2649 * checksumming here.
2651 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2652 if (skb
->encapsulation
)
2653 skb_set_inner_transport_header(skb
,
2654 skb_checksum_start_offset(skb
));
2656 skb_set_transport_header(skb
,
2657 skb_checksum_start_offset(skb
));
2658 if (!(features
& NETIF_F_ALL_CSUM
) &&
2659 skb_checksum_help(skb
))
2664 if (!list_empty(&ptype_all
))
2665 dev_queue_xmit_nit(skb
, dev
);
2668 trace_net_dev_start_xmit(skb
, dev
);
2669 rc
= netdev_start_xmit(skb
, dev
);
2670 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2671 if (rc
== NETDEV_TX_OK
)
2672 txq_trans_update(txq
);
2678 struct sk_buff
*nskb
= skb
->next
;
2680 skb
->next
= nskb
->next
;
2683 if (!list_empty(&ptype_all
))
2684 dev_queue_xmit_nit(nskb
, dev
);
2686 skb_len
= nskb
->len
;
2687 trace_net_dev_start_xmit(nskb
, dev
);
2688 rc
= netdev_start_xmit(nskb
, dev
);
2689 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2690 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2691 if (rc
& ~NETDEV_TX_MASK
)
2692 goto out_kfree_gso_skb
;
2693 nskb
->next
= skb
->next
;
2697 txq_trans_update(txq
);
2698 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2699 return NETDEV_TX_BUSY
;
2700 } while (skb
->next
);
2703 if (likely(skb
->next
== NULL
)) {
2704 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2713 EXPORT_SYMBOL_GPL(dev_hard_start_xmit
);
2715 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2717 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2719 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2721 /* To get more precise estimation of bytes sent on wire,
2722 * we add to pkt_len the headers size of all segments
2724 if (shinfo
->gso_size
) {
2725 unsigned int hdr_len
;
2726 u16 gso_segs
= shinfo
->gso_segs
;
2728 /* mac layer + network layer */
2729 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2731 /* + transport layer */
2732 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2733 hdr_len
+= tcp_hdrlen(skb
);
2735 hdr_len
+= sizeof(struct udphdr
);
2737 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2738 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2741 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2745 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2746 struct net_device
*dev
,
2747 struct netdev_queue
*txq
)
2749 spinlock_t
*root_lock
= qdisc_lock(q
);
2753 qdisc_pkt_len_init(skb
);
2754 qdisc_calculate_pkt_len(skb
, q
);
2756 * Heuristic to force contended enqueues to serialize on a
2757 * separate lock before trying to get qdisc main lock.
2758 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2759 * often and dequeue packets faster.
2761 contended
= qdisc_is_running(q
);
2762 if (unlikely(contended
))
2763 spin_lock(&q
->busylock
);
2765 spin_lock(root_lock
);
2766 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2769 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2770 qdisc_run_begin(q
)) {
2772 * This is a work-conserving queue; there are no old skbs
2773 * waiting to be sent out; and the qdisc is not running -
2774 * xmit the skb directly.
2776 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2779 qdisc_bstats_update(q
, skb
);
2781 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2782 if (unlikely(contended
)) {
2783 spin_unlock(&q
->busylock
);
2790 rc
= NET_XMIT_SUCCESS
;
2793 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2794 if (qdisc_run_begin(q
)) {
2795 if (unlikely(contended
)) {
2796 spin_unlock(&q
->busylock
);
2802 spin_unlock(root_lock
);
2803 if (unlikely(contended
))
2804 spin_unlock(&q
->busylock
);
2808 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2809 static void skb_update_prio(struct sk_buff
*skb
)
2811 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2813 if (!skb
->priority
&& skb
->sk
&& map
) {
2814 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2816 if (prioidx
< map
->priomap_len
)
2817 skb
->priority
= map
->priomap
[prioidx
];
2821 #define skb_update_prio(skb)
2824 static DEFINE_PER_CPU(int, xmit_recursion
);
2825 #define RECURSION_LIMIT 10
2828 * dev_loopback_xmit - loop back @skb
2829 * @skb: buffer to transmit
2831 int dev_loopback_xmit(struct sk_buff
*skb
)
2833 skb_reset_mac_header(skb
);
2834 __skb_pull(skb
, skb_network_offset(skb
));
2835 skb
->pkt_type
= PACKET_LOOPBACK
;
2836 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2837 WARN_ON(!skb_dst(skb
));
2842 EXPORT_SYMBOL(dev_loopback_xmit
);
2845 * __dev_queue_xmit - transmit a buffer
2846 * @skb: buffer to transmit
2847 * @accel_priv: private data used for L2 forwarding offload
2849 * Queue a buffer for transmission to a network device. The caller must
2850 * have set the device and priority and built the buffer before calling
2851 * this function. The function can be called from an interrupt.
2853 * A negative errno code is returned on a failure. A success does not
2854 * guarantee the frame will be transmitted as it may be dropped due
2855 * to congestion or traffic shaping.
2857 * -----------------------------------------------------------------------------------
2858 * I notice this method can also return errors from the queue disciplines,
2859 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2862 * Regardless of the return value, the skb is consumed, so it is currently
2863 * difficult to retry a send to this method. (You can bump the ref count
2864 * before sending to hold a reference for retry if you are careful.)
2866 * When calling this method, interrupts MUST be enabled. This is because
2867 * the BH enable code must have IRQs enabled so that it will not deadlock.
2870 static int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
2872 struct net_device
*dev
= skb
->dev
;
2873 struct netdev_queue
*txq
;
2877 skb_reset_mac_header(skb
);
2879 if (unlikely(skb_shinfo(skb
)->tx_flags
& SKBTX_SCHED_TSTAMP
))
2880 __skb_tstamp_tx(skb
, NULL
, skb
->sk
, SCM_TSTAMP_SCHED
);
2882 /* Disable soft irqs for various locks below. Also
2883 * stops preemption for RCU.
2887 skb_update_prio(skb
);
2889 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
2890 q
= rcu_dereference_bh(txq
->qdisc
);
2892 #ifdef CONFIG_NET_CLS_ACT
2893 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2895 trace_net_dev_queue(skb
);
2897 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2901 /* The device has no queue. Common case for software devices:
2902 loopback, all the sorts of tunnels...
2904 Really, it is unlikely that netif_tx_lock protection is necessary
2905 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2907 However, it is possible, that they rely on protection
2910 Check this and shot the lock. It is not prone from deadlocks.
2911 Either shot noqueue qdisc, it is even simpler 8)
2913 if (dev
->flags
& IFF_UP
) {
2914 int cpu
= smp_processor_id(); /* ok because BHs are off */
2916 if (txq
->xmit_lock_owner
!= cpu
) {
2918 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2919 goto recursion_alert
;
2921 HARD_TX_LOCK(dev
, txq
, cpu
);
2923 if (!netif_xmit_stopped(txq
)) {
2924 __this_cpu_inc(xmit_recursion
);
2925 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2926 __this_cpu_dec(xmit_recursion
);
2927 if (dev_xmit_complete(rc
)) {
2928 HARD_TX_UNLOCK(dev
, txq
);
2932 HARD_TX_UNLOCK(dev
, txq
);
2933 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2936 /* Recursion is detected! It is possible,
2940 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2946 rcu_read_unlock_bh();
2948 atomic_long_inc(&dev
->tx_dropped
);
2952 rcu_read_unlock_bh();
2956 int dev_queue_xmit(struct sk_buff
*skb
)
2958 return __dev_queue_xmit(skb
, NULL
);
2960 EXPORT_SYMBOL(dev_queue_xmit
);
2962 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
2964 return __dev_queue_xmit(skb
, accel_priv
);
2966 EXPORT_SYMBOL(dev_queue_xmit_accel
);
2969 /*=======================================================================
2971 =======================================================================*/
2973 int netdev_max_backlog __read_mostly
= 1000;
2974 EXPORT_SYMBOL(netdev_max_backlog
);
2976 int netdev_tstamp_prequeue __read_mostly
= 1;
2977 int netdev_budget __read_mostly
= 300;
2978 int weight_p __read_mostly
= 64; /* old backlog weight */
2980 /* Called with irq disabled */
2981 static inline void ____napi_schedule(struct softnet_data
*sd
,
2982 struct napi_struct
*napi
)
2984 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2985 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2990 /* One global table that all flow-based protocols share. */
2991 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2992 EXPORT_SYMBOL(rps_sock_flow_table
);
2994 struct static_key rps_needed __read_mostly
;
2996 static struct rps_dev_flow
*
2997 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2998 struct rps_dev_flow
*rflow
, u16 next_cpu
)
3000 if (next_cpu
!= RPS_NO_CPU
) {
3001 #ifdef CONFIG_RFS_ACCEL
3002 struct netdev_rx_queue
*rxqueue
;
3003 struct rps_dev_flow_table
*flow_table
;
3004 struct rps_dev_flow
*old_rflow
;
3009 /* Should we steer this flow to a different hardware queue? */
3010 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
3011 !(dev
->features
& NETIF_F_NTUPLE
))
3013 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
3014 if (rxq_index
== skb_get_rx_queue(skb
))
3017 rxqueue
= dev
->_rx
+ rxq_index
;
3018 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3021 flow_id
= skb_get_hash(skb
) & flow_table
->mask
;
3022 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
3023 rxq_index
, flow_id
);
3027 rflow
= &flow_table
->flows
[flow_id
];
3029 if (old_rflow
->filter
== rflow
->filter
)
3030 old_rflow
->filter
= RPS_NO_FILTER
;
3034 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
3037 rflow
->cpu
= next_cpu
;
3042 * get_rps_cpu is called from netif_receive_skb and returns the target
3043 * CPU from the RPS map of the receiving queue for a given skb.
3044 * rcu_read_lock must be held on entry.
3046 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3047 struct rps_dev_flow
**rflowp
)
3049 struct netdev_rx_queue
*rxqueue
;
3050 struct rps_map
*map
;
3051 struct rps_dev_flow_table
*flow_table
;
3052 struct rps_sock_flow_table
*sock_flow_table
;
3057 if (skb_rx_queue_recorded(skb
)) {
3058 u16 index
= skb_get_rx_queue(skb
);
3059 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
3060 WARN_ONCE(dev
->real_num_rx_queues
> 1,
3061 "%s received packet on queue %u, but number "
3062 "of RX queues is %u\n",
3063 dev
->name
, index
, dev
->real_num_rx_queues
);
3066 rxqueue
= dev
->_rx
+ index
;
3070 map
= rcu_dereference(rxqueue
->rps_map
);
3072 if (map
->len
== 1 &&
3073 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
3074 tcpu
= map
->cpus
[0];
3075 if (cpu_online(tcpu
))
3079 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
3083 skb_reset_network_header(skb
);
3084 hash
= skb_get_hash(skb
);
3088 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3089 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3090 if (flow_table
&& sock_flow_table
) {
3092 struct rps_dev_flow
*rflow
;
3094 rflow
= &flow_table
->flows
[hash
& flow_table
->mask
];
3097 next_cpu
= sock_flow_table
->ents
[hash
& sock_flow_table
->mask
];
3100 * If the desired CPU (where last recvmsg was done) is
3101 * different from current CPU (one in the rx-queue flow
3102 * table entry), switch if one of the following holds:
3103 * - Current CPU is unset (equal to RPS_NO_CPU).
3104 * - Current CPU is offline.
3105 * - The current CPU's queue tail has advanced beyond the
3106 * last packet that was enqueued using this table entry.
3107 * This guarantees that all previous packets for the flow
3108 * have been dequeued, thus preserving in order delivery.
3110 if (unlikely(tcpu
!= next_cpu
) &&
3111 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
3112 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3113 rflow
->last_qtail
)) >= 0)) {
3115 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3118 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
3126 tcpu
= map
->cpus
[reciprocal_scale(hash
, map
->len
)];
3127 if (cpu_online(tcpu
)) {
3137 #ifdef CONFIG_RFS_ACCEL
3140 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3141 * @dev: Device on which the filter was set
3142 * @rxq_index: RX queue index
3143 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3144 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3146 * Drivers that implement ndo_rx_flow_steer() should periodically call
3147 * this function for each installed filter and remove the filters for
3148 * which it returns %true.
3150 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3151 u32 flow_id
, u16 filter_id
)
3153 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3154 struct rps_dev_flow_table
*flow_table
;
3155 struct rps_dev_flow
*rflow
;
3160 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3161 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3162 rflow
= &flow_table
->flows
[flow_id
];
3163 cpu
= ACCESS_ONCE(rflow
->cpu
);
3164 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
3165 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3166 rflow
->last_qtail
) <
3167 (int)(10 * flow_table
->mask
)))
3173 EXPORT_SYMBOL(rps_may_expire_flow
);
3175 #endif /* CONFIG_RFS_ACCEL */
3177 /* Called from hardirq (IPI) context */
3178 static void rps_trigger_softirq(void *data
)
3180 struct softnet_data
*sd
= data
;
3182 ____napi_schedule(sd
, &sd
->backlog
);
3186 #endif /* CONFIG_RPS */
3189 * Check if this softnet_data structure is another cpu one
3190 * If yes, queue it to our IPI list and return 1
3193 static int rps_ipi_queued(struct softnet_data
*sd
)
3196 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
3199 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3200 mysd
->rps_ipi_list
= sd
;
3202 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3205 #endif /* CONFIG_RPS */
3209 #ifdef CONFIG_NET_FLOW_LIMIT
3210 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3213 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3215 #ifdef CONFIG_NET_FLOW_LIMIT
3216 struct sd_flow_limit
*fl
;
3217 struct softnet_data
*sd
;
3218 unsigned int old_flow
, new_flow
;
3220 if (qlen
< (netdev_max_backlog
>> 1))
3223 sd
= &__get_cpu_var(softnet_data
);
3226 fl
= rcu_dereference(sd
->flow_limit
);
3228 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3229 old_flow
= fl
->history
[fl
->history_head
];
3230 fl
->history
[fl
->history_head
] = new_flow
;
3233 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3235 if (likely(fl
->buckets
[old_flow
]))
3236 fl
->buckets
[old_flow
]--;
3238 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3250 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3251 * queue (may be a remote CPU queue).
3253 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3254 unsigned int *qtail
)
3256 struct softnet_data
*sd
;
3257 unsigned long flags
;
3260 sd
= &per_cpu(softnet_data
, cpu
);
3262 local_irq_save(flags
);
3265 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3266 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3267 if (skb_queue_len(&sd
->input_pkt_queue
)) {
3269 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3270 input_queue_tail_incr_save(sd
, qtail
);
3272 local_irq_restore(flags
);
3273 return NET_RX_SUCCESS
;
3276 /* Schedule NAPI for backlog device
3277 * We can use non atomic operation since we own the queue lock
3279 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3280 if (!rps_ipi_queued(sd
))
3281 ____napi_schedule(sd
, &sd
->backlog
);
3289 local_irq_restore(flags
);
3291 atomic_long_inc(&skb
->dev
->rx_dropped
);
3296 static int netif_rx_internal(struct sk_buff
*skb
)
3300 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3302 trace_netif_rx(skb
);
3304 if (static_key_false(&rps_needed
)) {
3305 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3311 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3313 cpu
= smp_processor_id();
3315 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3323 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3330 * netif_rx - post buffer to the network code
3331 * @skb: buffer to post
3333 * This function receives a packet from a device driver and queues it for
3334 * the upper (protocol) levels to process. It always succeeds. The buffer
3335 * may be dropped during processing for congestion control or by the
3339 * NET_RX_SUCCESS (no congestion)
3340 * NET_RX_DROP (packet was dropped)
3344 int netif_rx(struct sk_buff
*skb
)
3346 trace_netif_rx_entry(skb
);
3348 return netif_rx_internal(skb
);
3350 EXPORT_SYMBOL(netif_rx
);
3352 int netif_rx_ni(struct sk_buff
*skb
)
3356 trace_netif_rx_ni_entry(skb
);
3359 err
= netif_rx_internal(skb
);
3360 if (local_softirq_pending())
3366 EXPORT_SYMBOL(netif_rx_ni
);
3368 static void net_tx_action(struct softirq_action
*h
)
3370 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3372 if (sd
->completion_queue
) {
3373 struct sk_buff
*clist
;
3375 local_irq_disable();
3376 clist
= sd
->completion_queue
;
3377 sd
->completion_queue
= NULL
;
3381 struct sk_buff
*skb
= clist
;
3382 clist
= clist
->next
;
3384 WARN_ON(atomic_read(&skb
->users
));
3385 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
3386 trace_consume_skb(skb
);
3388 trace_kfree_skb(skb
, net_tx_action
);
3393 if (sd
->output_queue
) {
3396 local_irq_disable();
3397 head
= sd
->output_queue
;
3398 sd
->output_queue
= NULL
;
3399 sd
->output_queue_tailp
= &sd
->output_queue
;
3403 struct Qdisc
*q
= head
;
3404 spinlock_t
*root_lock
;
3406 head
= head
->next_sched
;
3408 root_lock
= qdisc_lock(q
);
3409 if (spin_trylock(root_lock
)) {
3410 smp_mb__before_atomic();
3411 clear_bit(__QDISC_STATE_SCHED
,
3414 spin_unlock(root_lock
);
3416 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3418 __netif_reschedule(q
);
3420 smp_mb__before_atomic();
3421 clear_bit(__QDISC_STATE_SCHED
,
3429 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3430 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3431 /* This hook is defined here for ATM LANE */
3432 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3433 unsigned char *addr
) __read_mostly
;
3434 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3437 #ifdef CONFIG_NET_CLS_ACT
3438 /* TODO: Maybe we should just force sch_ingress to be compiled in
3439 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3440 * a compare and 2 stores extra right now if we dont have it on
3441 * but have CONFIG_NET_CLS_ACT
3442 * NOTE: This doesn't stop any functionality; if you dont have
3443 * the ingress scheduler, you just can't add policies on ingress.
3446 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3448 struct net_device
*dev
= skb
->dev
;
3449 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3450 int result
= TC_ACT_OK
;
3453 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3454 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3455 skb
->skb_iif
, dev
->ifindex
);
3459 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3460 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3463 if (q
!= &noop_qdisc
) {
3464 spin_lock(qdisc_lock(q
));
3465 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3466 result
= qdisc_enqueue_root(skb
, q
);
3467 spin_unlock(qdisc_lock(q
));
3473 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3474 struct packet_type
**pt_prev
,
3475 int *ret
, struct net_device
*orig_dev
)
3477 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3479 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3483 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3487 switch (ing_filter(skb
, rxq
)) {
3501 * netdev_rx_handler_register - register receive handler
3502 * @dev: device to register a handler for
3503 * @rx_handler: receive handler to register
3504 * @rx_handler_data: data pointer that is used by rx handler
3506 * Register a receive handler for a device. This handler will then be
3507 * called from __netif_receive_skb. A negative errno code is returned
3510 * The caller must hold the rtnl_mutex.
3512 * For a general description of rx_handler, see enum rx_handler_result.
3514 int netdev_rx_handler_register(struct net_device
*dev
,
3515 rx_handler_func_t
*rx_handler
,
3516 void *rx_handler_data
)
3520 if (dev
->rx_handler
)
3523 /* Note: rx_handler_data must be set before rx_handler */
3524 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3525 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3529 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3532 * netdev_rx_handler_unregister - unregister receive handler
3533 * @dev: device to unregister a handler from
3535 * Unregister a receive handler from a device.
3537 * The caller must hold the rtnl_mutex.
3539 void netdev_rx_handler_unregister(struct net_device
*dev
)
3543 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3544 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3545 * section has a guarantee to see a non NULL rx_handler_data
3549 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3551 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3554 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3555 * the special handling of PFMEMALLOC skbs.
3557 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3559 switch (skb
->protocol
) {
3560 case htons(ETH_P_ARP
):
3561 case htons(ETH_P_IP
):
3562 case htons(ETH_P_IPV6
):
3563 case htons(ETH_P_8021Q
):
3564 case htons(ETH_P_8021AD
):
3571 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3573 struct packet_type
*ptype
, *pt_prev
;
3574 rx_handler_func_t
*rx_handler
;
3575 struct net_device
*orig_dev
;
3576 struct net_device
*null_or_dev
;
3577 bool deliver_exact
= false;
3578 int ret
= NET_RX_DROP
;
3581 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3583 trace_netif_receive_skb(skb
);
3585 orig_dev
= skb
->dev
;
3587 skb_reset_network_header(skb
);
3588 if (!skb_transport_header_was_set(skb
))
3589 skb_reset_transport_header(skb
);
3590 skb_reset_mac_len(skb
);
3597 skb
->skb_iif
= skb
->dev
->ifindex
;
3599 __this_cpu_inc(softnet_data
.processed
);
3601 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
3602 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
3603 skb
= skb_vlan_untag(skb
);
3608 #ifdef CONFIG_NET_CLS_ACT
3609 if (skb
->tc_verd
& TC_NCLS
) {
3610 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3618 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3619 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3621 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3627 #ifdef CONFIG_NET_CLS_ACT
3628 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3634 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3637 if (vlan_tx_tag_present(skb
)) {
3639 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3642 if (vlan_do_receive(&skb
))
3644 else if (unlikely(!skb
))
3648 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3651 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3654 switch (rx_handler(&skb
)) {
3655 case RX_HANDLER_CONSUMED
:
3656 ret
= NET_RX_SUCCESS
;
3658 case RX_HANDLER_ANOTHER
:
3660 case RX_HANDLER_EXACT
:
3661 deliver_exact
= true;
3662 case RX_HANDLER_PASS
:
3669 if (unlikely(vlan_tx_tag_present(skb
))) {
3670 if (vlan_tx_tag_get_id(skb
))
3671 skb
->pkt_type
= PACKET_OTHERHOST
;
3672 /* Note: we might in the future use prio bits
3673 * and set skb->priority like in vlan_do_receive()
3674 * For the time being, just ignore Priority Code Point
3679 /* deliver only exact match when indicated */
3680 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3682 type
= skb
->protocol
;
3683 list_for_each_entry_rcu(ptype
,
3684 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3685 if (ptype
->type
== type
&&
3686 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3687 ptype
->dev
== orig_dev
)) {
3689 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3695 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3698 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3701 atomic_long_inc(&skb
->dev
->rx_dropped
);
3703 /* Jamal, now you will not able to escape explaining
3704 * me how you were going to use this. :-)
3714 static int __netif_receive_skb(struct sk_buff
*skb
)
3718 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3719 unsigned long pflags
= current
->flags
;
3722 * PFMEMALLOC skbs are special, they should
3723 * - be delivered to SOCK_MEMALLOC sockets only
3724 * - stay away from userspace
3725 * - have bounded memory usage
3727 * Use PF_MEMALLOC as this saves us from propagating the allocation
3728 * context down to all allocation sites.
3730 current
->flags
|= PF_MEMALLOC
;
3731 ret
= __netif_receive_skb_core(skb
, true);
3732 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3734 ret
= __netif_receive_skb_core(skb
, false);
3739 static int netif_receive_skb_internal(struct sk_buff
*skb
)
3741 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3743 if (skb_defer_rx_timestamp(skb
))
3744 return NET_RX_SUCCESS
;
3747 if (static_key_false(&rps_needed
)) {
3748 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3753 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3756 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3763 return __netif_receive_skb(skb
);
3767 * netif_receive_skb - process receive buffer from network
3768 * @skb: buffer to process
3770 * netif_receive_skb() is the main receive data processing function.
3771 * It always succeeds. The buffer may be dropped during processing
3772 * for congestion control or by the protocol layers.
3774 * This function may only be called from softirq context and interrupts
3775 * should be enabled.
3777 * Return values (usually ignored):
3778 * NET_RX_SUCCESS: no congestion
3779 * NET_RX_DROP: packet was dropped
3781 int netif_receive_skb(struct sk_buff
*skb
)
3783 trace_netif_receive_skb_entry(skb
);
3785 return netif_receive_skb_internal(skb
);
3787 EXPORT_SYMBOL(netif_receive_skb
);
3789 /* Network device is going away, flush any packets still pending
3790 * Called with irqs disabled.
3792 static void flush_backlog(void *arg
)
3794 struct net_device
*dev
= arg
;
3795 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3796 struct sk_buff
*skb
, *tmp
;
3799 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3800 if (skb
->dev
== dev
) {
3801 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3803 input_queue_head_incr(sd
);
3808 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3809 if (skb
->dev
== dev
) {
3810 __skb_unlink(skb
, &sd
->process_queue
);
3812 input_queue_head_incr(sd
);
3817 static int napi_gro_complete(struct sk_buff
*skb
)
3819 struct packet_offload
*ptype
;
3820 __be16 type
= skb
->protocol
;
3821 struct list_head
*head
= &offload_base
;
3824 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
3826 if (NAPI_GRO_CB(skb
)->count
== 1) {
3827 skb_shinfo(skb
)->gso_size
= 0;
3832 list_for_each_entry_rcu(ptype
, head
, list
) {
3833 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
3836 err
= ptype
->callbacks
.gro_complete(skb
, 0);
3842 WARN_ON(&ptype
->list
== head
);
3844 return NET_RX_SUCCESS
;
3848 return netif_receive_skb_internal(skb
);
3851 /* napi->gro_list contains packets ordered by age.
3852 * youngest packets at the head of it.
3853 * Complete skbs in reverse order to reduce latencies.
3855 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
3857 struct sk_buff
*skb
, *prev
= NULL
;
3859 /* scan list and build reverse chain */
3860 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
3865 for (skb
= prev
; skb
; skb
= prev
) {
3868 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
3872 napi_gro_complete(skb
);
3876 napi
->gro_list
= NULL
;
3878 EXPORT_SYMBOL(napi_gro_flush
);
3880 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
3883 unsigned int maclen
= skb
->dev
->hard_header_len
;
3884 u32 hash
= skb_get_hash_raw(skb
);
3886 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3887 unsigned long diffs
;
3889 NAPI_GRO_CB(p
)->flush
= 0;
3891 if (hash
!= skb_get_hash_raw(p
)) {
3892 NAPI_GRO_CB(p
)->same_flow
= 0;
3896 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3897 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3898 if (maclen
== ETH_HLEN
)
3899 diffs
|= compare_ether_header(skb_mac_header(p
),
3900 skb_mac_header(skb
));
3902 diffs
= memcmp(skb_mac_header(p
),
3903 skb_mac_header(skb
),
3905 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3909 static void skb_gro_reset_offset(struct sk_buff
*skb
)
3911 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3912 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
3914 NAPI_GRO_CB(skb
)->data_offset
= 0;
3915 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3916 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3918 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
3920 !PageHighMem(skb_frag_page(frag0
))) {
3921 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
3922 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
3926 static void gro_pull_from_frag0(struct sk_buff
*skb
, int grow
)
3928 struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3930 BUG_ON(skb
->end
- skb
->tail
< grow
);
3932 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3934 skb
->data_len
-= grow
;
3937 pinfo
->frags
[0].page_offset
+= grow
;
3938 skb_frag_size_sub(&pinfo
->frags
[0], grow
);
3940 if (unlikely(!skb_frag_size(&pinfo
->frags
[0]))) {
3941 skb_frag_unref(skb
, 0);
3942 memmove(pinfo
->frags
, pinfo
->frags
+ 1,
3943 --pinfo
->nr_frags
* sizeof(pinfo
->frags
[0]));
3947 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3949 struct sk_buff
**pp
= NULL
;
3950 struct packet_offload
*ptype
;
3951 __be16 type
= skb
->protocol
;
3952 struct list_head
*head
= &offload_base
;
3954 enum gro_result ret
;
3957 if (!(skb
->dev
->features
& NETIF_F_GRO
))
3960 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3963 gro_list_prepare(napi
, skb
);
3965 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
3966 NAPI_GRO_CB(skb
)->csum
= skb
->csum
;
3967 NAPI_GRO_CB(skb
)->csum_valid
= 1;
3969 NAPI_GRO_CB(skb
)->csum_valid
= 0;
3973 list_for_each_entry_rcu(ptype
, head
, list
) {
3974 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
3977 skb_set_network_header(skb
, skb_gro_offset(skb
));
3978 skb_reset_mac_len(skb
);
3979 NAPI_GRO_CB(skb
)->same_flow
= 0;
3980 NAPI_GRO_CB(skb
)->flush
= 0;
3981 NAPI_GRO_CB(skb
)->free
= 0;
3982 NAPI_GRO_CB(skb
)->udp_mark
= 0;
3983 NAPI_GRO_CB(skb
)->encapsulation
= 0;
3985 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
3990 if (&ptype
->list
== head
)
3993 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3994 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3997 struct sk_buff
*nskb
= *pp
;
4001 napi_gro_complete(nskb
);
4008 if (NAPI_GRO_CB(skb
)->flush
)
4011 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
4012 struct sk_buff
*nskb
= napi
->gro_list
;
4014 /* locate the end of the list to select the 'oldest' flow */
4015 while (nskb
->next
) {
4021 napi_gro_complete(nskb
);
4025 NAPI_GRO_CB(skb
)->count
= 1;
4026 NAPI_GRO_CB(skb
)->age
= jiffies
;
4027 NAPI_GRO_CB(skb
)->last
= skb
;
4028 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
4029 skb
->next
= napi
->gro_list
;
4030 napi
->gro_list
= skb
;
4034 grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
4036 gro_pull_from_frag0(skb
, grow
);
4045 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
4047 struct list_head
*offload_head
= &offload_base
;
4048 struct packet_offload
*ptype
;
4050 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4051 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4057 EXPORT_SYMBOL(gro_find_receive_by_type
);
4059 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
4061 struct list_head
*offload_head
= &offload_base
;
4062 struct packet_offload
*ptype
;
4064 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4065 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4071 EXPORT_SYMBOL(gro_find_complete_by_type
);
4073 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
4077 if (netif_receive_skb_internal(skb
))
4085 case GRO_MERGED_FREE
:
4086 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
4087 kmem_cache_free(skbuff_head_cache
, skb
);
4100 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4102 trace_napi_gro_receive_entry(skb
);
4104 skb_gro_reset_offset(skb
);
4106 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4108 EXPORT_SYMBOL(napi_gro_receive
);
4110 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4112 __skb_pull(skb
, skb_headlen(skb
));
4113 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4114 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
4116 skb
->dev
= napi
->dev
;
4118 skb
->encapsulation
= 0;
4119 skb_shinfo(skb
)->gso_type
= 0;
4120 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
4125 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
4127 struct sk_buff
*skb
= napi
->skb
;
4130 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
4135 EXPORT_SYMBOL(napi_get_frags
);
4137 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
4138 struct sk_buff
*skb
,
4144 __skb_push(skb
, ETH_HLEN
);
4145 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4146 if (ret
== GRO_NORMAL
&& netif_receive_skb_internal(skb
))
4151 case GRO_MERGED_FREE
:
4152 napi_reuse_skb(napi
, skb
);
4162 /* Upper GRO stack assumes network header starts at gro_offset=0
4163 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4164 * We copy ethernet header into skb->data to have a common layout.
4166 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4168 struct sk_buff
*skb
= napi
->skb
;
4169 const struct ethhdr
*eth
;
4170 unsigned int hlen
= sizeof(*eth
);
4174 skb_reset_mac_header(skb
);
4175 skb_gro_reset_offset(skb
);
4177 eth
= skb_gro_header_fast(skb
, 0);
4178 if (unlikely(skb_gro_header_hard(skb
, hlen
))) {
4179 eth
= skb_gro_header_slow(skb
, hlen
, 0);
4180 if (unlikely(!eth
)) {
4181 napi_reuse_skb(napi
, skb
);
4185 gro_pull_from_frag0(skb
, hlen
);
4186 NAPI_GRO_CB(skb
)->frag0
+= hlen
;
4187 NAPI_GRO_CB(skb
)->frag0_len
-= hlen
;
4189 __skb_pull(skb
, hlen
);
4192 * This works because the only protocols we care about don't require
4194 * We'll fix it up properly in napi_frags_finish()
4196 skb
->protocol
= eth
->h_proto
;
4201 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4203 struct sk_buff
*skb
= napi_frags_skb(napi
);
4208 trace_napi_gro_frags_entry(skb
);
4210 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4212 EXPORT_SYMBOL(napi_gro_frags
);
4214 /* Compute the checksum from gro_offset and return the folded value
4215 * after adding in any pseudo checksum.
4217 __sum16
__skb_gro_checksum_complete(struct sk_buff
*skb
)
4222 wsum
= skb_checksum(skb
, skb_gro_offset(skb
), skb_gro_len(skb
), 0);
4224 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4225 sum
= csum_fold(csum_add(NAPI_GRO_CB(skb
)->csum
, wsum
));
4227 if (unlikely(skb
->ip_summed
== CHECKSUM_COMPLETE
) &&
4228 !skb
->csum_complete_sw
)
4229 netdev_rx_csum_fault(skb
->dev
);
4232 NAPI_GRO_CB(skb
)->csum
= wsum
;
4233 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4237 EXPORT_SYMBOL(__skb_gro_checksum_complete
);
4240 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4241 * Note: called with local irq disabled, but exits with local irq enabled.
4243 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4246 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4249 sd
->rps_ipi_list
= NULL
;
4253 /* Send pending IPI's to kick RPS processing on remote cpus. */
4255 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4257 if (cpu_online(remsd
->cpu
))
4258 smp_call_function_single_async(remsd
->cpu
,
4267 static int process_backlog(struct napi_struct
*napi
, int quota
)
4270 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4273 /* Check if we have pending ipi, its better to send them now,
4274 * not waiting net_rx_action() end.
4276 if (sd
->rps_ipi_list
) {
4277 local_irq_disable();
4278 net_rps_action_and_irq_enable(sd
);
4281 napi
->weight
= weight_p
;
4282 local_irq_disable();
4284 struct sk_buff
*skb
;
4286 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4288 __netif_receive_skb(skb
);
4289 local_irq_disable();
4290 input_queue_head_incr(sd
);
4291 if (++work
>= quota
) {
4298 if (skb_queue_empty(&sd
->input_pkt_queue
)) {
4300 * Inline a custom version of __napi_complete().
4301 * only current cpu owns and manipulates this napi,
4302 * and NAPI_STATE_SCHED is the only possible flag set
4304 * We can use a plain write instead of clear_bit(),
4305 * and we dont need an smp_mb() memory barrier.
4307 list_del(&napi
->poll_list
);
4314 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4315 &sd
->process_queue
);
4324 * __napi_schedule - schedule for receive
4325 * @n: entry to schedule
4327 * The entry's receive function will be scheduled to run
4329 void __napi_schedule(struct napi_struct
*n
)
4331 unsigned long flags
;
4333 local_irq_save(flags
);
4334 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
4335 local_irq_restore(flags
);
4337 EXPORT_SYMBOL(__napi_schedule
);
4339 void __napi_complete(struct napi_struct
*n
)
4341 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4342 BUG_ON(n
->gro_list
);
4344 list_del(&n
->poll_list
);
4345 smp_mb__before_atomic();
4346 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4348 EXPORT_SYMBOL(__napi_complete
);
4350 void napi_complete(struct napi_struct
*n
)
4352 unsigned long flags
;
4355 * don't let napi dequeue from the cpu poll list
4356 * just in case its running on a different cpu
4358 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4361 napi_gro_flush(n
, false);
4362 local_irq_save(flags
);
4364 local_irq_restore(flags
);
4366 EXPORT_SYMBOL(napi_complete
);
4368 /* must be called under rcu_read_lock(), as we dont take a reference */
4369 struct napi_struct
*napi_by_id(unsigned int napi_id
)
4371 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4372 struct napi_struct
*napi
;
4374 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4375 if (napi
->napi_id
== napi_id
)
4380 EXPORT_SYMBOL_GPL(napi_by_id
);
4382 void napi_hash_add(struct napi_struct
*napi
)
4384 if (!test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
4386 spin_lock(&napi_hash_lock
);
4388 /* 0 is not a valid id, we also skip an id that is taken
4389 * we expect both events to be extremely rare
4392 while (!napi
->napi_id
) {
4393 napi
->napi_id
= ++napi_gen_id
;
4394 if (napi_by_id(napi
->napi_id
))
4398 hlist_add_head_rcu(&napi
->napi_hash_node
,
4399 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
4401 spin_unlock(&napi_hash_lock
);
4404 EXPORT_SYMBOL_GPL(napi_hash_add
);
4406 /* Warning : caller is responsible to make sure rcu grace period
4407 * is respected before freeing memory containing @napi
4409 void napi_hash_del(struct napi_struct
*napi
)
4411 spin_lock(&napi_hash_lock
);
4413 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
))
4414 hlist_del_rcu(&napi
->napi_hash_node
);
4416 spin_unlock(&napi_hash_lock
);
4418 EXPORT_SYMBOL_GPL(napi_hash_del
);
4420 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4421 int (*poll
)(struct napi_struct
*, int), int weight
)
4423 INIT_LIST_HEAD(&napi
->poll_list
);
4424 napi
->gro_count
= 0;
4425 napi
->gro_list
= NULL
;
4428 if (weight
> NAPI_POLL_WEIGHT
)
4429 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4431 napi
->weight
= weight
;
4432 list_add(&napi
->dev_list
, &dev
->napi_list
);
4434 #ifdef CONFIG_NETPOLL
4435 spin_lock_init(&napi
->poll_lock
);
4436 napi
->poll_owner
= -1;
4438 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4440 EXPORT_SYMBOL(netif_napi_add
);
4442 void netif_napi_del(struct napi_struct
*napi
)
4444 list_del_init(&napi
->dev_list
);
4445 napi_free_frags(napi
);
4447 kfree_skb_list(napi
->gro_list
);
4448 napi
->gro_list
= NULL
;
4449 napi
->gro_count
= 0;
4451 EXPORT_SYMBOL(netif_napi_del
);
4453 static void net_rx_action(struct softirq_action
*h
)
4455 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
4456 unsigned long time_limit
= jiffies
+ 2;
4457 int budget
= netdev_budget
;
4460 local_irq_disable();
4462 while (!list_empty(&sd
->poll_list
)) {
4463 struct napi_struct
*n
;
4466 /* If softirq window is exhuasted then punt.
4467 * Allow this to run for 2 jiffies since which will allow
4468 * an average latency of 1.5/HZ.
4470 if (unlikely(budget
<= 0 || time_after_eq(jiffies
, time_limit
)))
4475 /* Even though interrupts have been re-enabled, this
4476 * access is safe because interrupts can only add new
4477 * entries to the tail of this list, and only ->poll()
4478 * calls can remove this head entry from the list.
4480 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
4482 have
= netpoll_poll_lock(n
);
4486 /* This NAPI_STATE_SCHED test is for avoiding a race
4487 * with netpoll's poll_napi(). Only the entity which
4488 * obtains the lock and sees NAPI_STATE_SCHED set will
4489 * actually make the ->poll() call. Therefore we avoid
4490 * accidentally calling ->poll() when NAPI is not scheduled.
4493 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4494 work
= n
->poll(n
, weight
);
4498 WARN_ON_ONCE(work
> weight
);
4502 local_irq_disable();
4504 /* Drivers must not modify the NAPI state if they
4505 * consume the entire weight. In such cases this code
4506 * still "owns" the NAPI instance and therefore can
4507 * move the instance around on the list at-will.
4509 if (unlikely(work
== weight
)) {
4510 if (unlikely(napi_disable_pending(n
))) {
4513 local_irq_disable();
4516 /* flush too old packets
4517 * If HZ < 1000, flush all packets.
4520 napi_gro_flush(n
, HZ
>= 1000);
4521 local_irq_disable();
4523 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
4527 netpoll_poll_unlock(have
);
4530 net_rps_action_and_irq_enable(sd
);
4532 #ifdef CONFIG_NET_DMA
4534 * There may not be any more sk_buffs coming right now, so push
4535 * any pending DMA copies to hardware
4537 dma_issue_pending_all();
4544 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4548 struct netdev_adjacent
{
4549 struct net_device
*dev
;
4551 /* upper master flag, there can only be one master device per list */
4554 /* counter for the number of times this device was added to us */
4557 /* private field for the users */
4560 struct list_head list
;
4561 struct rcu_head rcu
;
4564 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*dev
,
4565 struct net_device
*adj_dev
,
4566 struct list_head
*adj_list
)
4568 struct netdev_adjacent
*adj
;
4570 list_for_each_entry(adj
, adj_list
, list
) {
4571 if (adj
->dev
== adj_dev
)
4578 * netdev_has_upper_dev - Check if device is linked to an upper device
4580 * @upper_dev: upper device to check
4582 * Find out if a device is linked to specified upper device and return true
4583 * in case it is. Note that this checks only immediate upper device,
4584 * not through a complete stack of devices. The caller must hold the RTNL lock.
4586 bool netdev_has_upper_dev(struct net_device
*dev
,
4587 struct net_device
*upper_dev
)
4591 return __netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
);
4593 EXPORT_SYMBOL(netdev_has_upper_dev
);
4596 * netdev_has_any_upper_dev - Check if device is linked to some device
4599 * Find out if a device is linked to an upper device and return true in case
4600 * it is. The caller must hold the RTNL lock.
4602 static bool netdev_has_any_upper_dev(struct net_device
*dev
)
4606 return !list_empty(&dev
->all_adj_list
.upper
);
4610 * netdev_master_upper_dev_get - Get master upper device
4613 * Find a master upper device and return pointer to it or NULL in case
4614 * it's not there. The caller must hold the RTNL lock.
4616 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4618 struct netdev_adjacent
*upper
;
4622 if (list_empty(&dev
->adj_list
.upper
))
4625 upper
= list_first_entry(&dev
->adj_list
.upper
,
4626 struct netdev_adjacent
, list
);
4627 if (likely(upper
->master
))
4631 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4633 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
4635 struct netdev_adjacent
*adj
;
4637 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
4639 return adj
->private;
4641 EXPORT_SYMBOL(netdev_adjacent_get_private
);
4644 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
4646 * @iter: list_head ** of the current position
4648 * Gets the next device from the dev's upper list, starting from iter
4649 * position. The caller must hold RCU read lock.
4651 struct net_device
*netdev_upper_get_next_dev_rcu(struct net_device
*dev
,
4652 struct list_head
**iter
)
4654 struct netdev_adjacent
*upper
;
4656 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4658 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4660 if (&upper
->list
== &dev
->adj_list
.upper
)
4663 *iter
= &upper
->list
;
4667 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu
);
4670 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4672 * @iter: list_head ** of the current position
4674 * Gets the next device from the dev's upper list, starting from iter
4675 * position. The caller must hold RCU read lock.
4677 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
4678 struct list_head
**iter
)
4680 struct netdev_adjacent
*upper
;
4682 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4684 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4686 if (&upper
->list
== &dev
->all_adj_list
.upper
)
4689 *iter
= &upper
->list
;
4693 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
4696 * netdev_lower_get_next_private - Get the next ->private from the
4697 * lower neighbour list
4699 * @iter: list_head ** of the current position
4701 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4702 * list, starting from iter position. The caller must hold either hold the
4703 * RTNL lock or its own locking that guarantees that the neighbour lower
4704 * list will remain unchainged.
4706 void *netdev_lower_get_next_private(struct net_device
*dev
,
4707 struct list_head
**iter
)
4709 struct netdev_adjacent
*lower
;
4711 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
4713 if (&lower
->list
== &dev
->adj_list
.lower
)
4716 *iter
= lower
->list
.next
;
4718 return lower
->private;
4720 EXPORT_SYMBOL(netdev_lower_get_next_private
);
4723 * netdev_lower_get_next_private_rcu - Get the next ->private from the
4724 * lower neighbour list, RCU
4727 * @iter: list_head ** of the current position
4729 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4730 * list, starting from iter position. The caller must hold RCU read lock.
4732 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
4733 struct list_head
**iter
)
4735 struct netdev_adjacent
*lower
;
4737 WARN_ON_ONCE(!rcu_read_lock_held());
4739 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4741 if (&lower
->list
== &dev
->adj_list
.lower
)
4744 *iter
= &lower
->list
;
4746 return lower
->private;
4748 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
4751 * netdev_lower_get_next - Get the next device from the lower neighbour
4754 * @iter: list_head ** of the current position
4756 * Gets the next netdev_adjacent from the dev's lower neighbour
4757 * list, starting from iter position. The caller must hold RTNL lock or
4758 * its own locking that guarantees that the neighbour lower
4759 * list will remain unchainged.
4761 void *netdev_lower_get_next(struct net_device
*dev
, struct list_head
**iter
)
4763 struct netdev_adjacent
*lower
;
4765 lower
= list_entry((*iter
)->next
, struct netdev_adjacent
, list
);
4767 if (&lower
->list
== &dev
->adj_list
.lower
)
4770 *iter
= &lower
->list
;
4774 EXPORT_SYMBOL(netdev_lower_get_next
);
4777 * netdev_lower_get_first_private_rcu - Get the first ->private from the
4778 * lower neighbour list, RCU
4782 * Gets the first netdev_adjacent->private from the dev's lower neighbour
4783 * list. The caller must hold RCU read lock.
4785 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
4787 struct netdev_adjacent
*lower
;
4789 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
4790 struct netdev_adjacent
, list
);
4792 return lower
->private;
4795 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
4798 * netdev_master_upper_dev_get_rcu - Get master upper device
4801 * Find a master upper device and return pointer to it or NULL in case
4802 * it's not there. The caller must hold the RCU read lock.
4804 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
4806 struct netdev_adjacent
*upper
;
4808 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
4809 struct netdev_adjacent
, list
);
4810 if (upper
&& likely(upper
->master
))
4814 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
4816 static int netdev_adjacent_sysfs_add(struct net_device
*dev
,
4817 struct net_device
*adj_dev
,
4818 struct list_head
*dev_list
)
4820 char linkname
[IFNAMSIZ
+7];
4821 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
4822 "upper_%s" : "lower_%s", adj_dev
->name
);
4823 return sysfs_create_link(&(dev
->dev
.kobj
), &(adj_dev
->dev
.kobj
),
4826 static void netdev_adjacent_sysfs_del(struct net_device
*dev
,
4828 struct list_head
*dev_list
)
4830 char linkname
[IFNAMSIZ
+7];
4831 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
4832 "upper_%s" : "lower_%s", name
);
4833 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4836 #define netdev_adjacent_is_neigh_list(dev, dev_list) \
4837 (dev_list == &dev->adj_list.upper || \
4838 dev_list == &dev->adj_list.lower)
4840 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
4841 struct net_device
*adj_dev
,
4842 struct list_head
*dev_list
,
4843 void *private, bool master
)
4845 struct netdev_adjacent
*adj
;
4848 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
4855 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
4860 adj
->master
= master
;
4862 adj
->private = private;
4865 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
4866 adj_dev
->name
, dev
->name
, adj_dev
->name
);
4868 if (netdev_adjacent_is_neigh_list(dev
, dev_list
)) {
4869 ret
= netdev_adjacent_sysfs_add(dev
, adj_dev
, dev_list
);
4874 /* Ensure that master link is always the first item in list. */
4876 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
4877 &(adj_dev
->dev
.kobj
), "master");
4879 goto remove_symlinks
;
4881 list_add_rcu(&adj
->list
, dev_list
);
4883 list_add_tail_rcu(&adj
->list
, dev_list
);
4889 if (netdev_adjacent_is_neigh_list(dev
, dev_list
))
4890 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
4898 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
4899 struct net_device
*adj_dev
,
4900 struct list_head
*dev_list
)
4902 struct netdev_adjacent
*adj
;
4904 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
4907 pr_err("tried to remove device %s from %s\n",
4908 dev
->name
, adj_dev
->name
);
4912 if (adj
->ref_nr
> 1) {
4913 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
4920 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
4922 if (netdev_adjacent_is_neigh_list(dev
, dev_list
))
4923 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
4925 list_del_rcu(&adj
->list
);
4926 pr_debug("dev_put for %s, because link removed from %s to %s\n",
4927 adj_dev
->name
, dev
->name
, adj_dev
->name
);
4929 kfree_rcu(adj
, rcu
);
4932 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
4933 struct net_device
*upper_dev
,
4934 struct list_head
*up_list
,
4935 struct list_head
*down_list
,
4936 void *private, bool master
)
4940 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
4945 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
4948 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
4955 static int __netdev_adjacent_dev_link(struct net_device
*dev
,
4956 struct net_device
*upper_dev
)
4958 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
4959 &dev
->all_adj_list
.upper
,
4960 &upper_dev
->all_adj_list
.lower
,
4964 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
4965 struct net_device
*upper_dev
,
4966 struct list_head
*up_list
,
4967 struct list_head
*down_list
)
4969 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
4970 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
4973 static void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
4974 struct net_device
*upper_dev
)
4976 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
4977 &dev
->all_adj_list
.upper
,
4978 &upper_dev
->all_adj_list
.lower
);
4981 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
4982 struct net_device
*upper_dev
,
4983 void *private, bool master
)
4985 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
4990 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
4991 &dev
->adj_list
.upper
,
4992 &upper_dev
->adj_list
.lower
,
4995 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5002 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
5003 struct net_device
*upper_dev
)
5005 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5006 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5007 &dev
->adj_list
.upper
,
5008 &upper_dev
->adj_list
.lower
);
5011 static int __netdev_upper_dev_link(struct net_device
*dev
,
5012 struct net_device
*upper_dev
, bool master
,
5015 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
5020 if (dev
== upper_dev
)
5023 /* To prevent loops, check if dev is not upper device to upper_dev. */
5024 if (__netdev_find_adj(upper_dev
, dev
, &upper_dev
->all_adj_list
.upper
))
5027 if (__netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
))
5030 if (master
&& netdev_master_upper_dev_get(dev
))
5033 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, private,
5038 /* Now that we linked these devs, make all the upper_dev's
5039 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5040 * versa, and don't forget the devices itself. All of these
5041 * links are non-neighbours.
5043 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5044 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5045 pr_debug("Interlinking %s with %s, non-neighbour\n",
5046 i
->dev
->name
, j
->dev
->name
);
5047 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
5053 /* add dev to every upper_dev's upper device */
5054 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5055 pr_debug("linking %s's upper device %s with %s\n",
5056 upper_dev
->name
, i
->dev
->name
, dev
->name
);
5057 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
5059 goto rollback_upper_mesh
;
5062 /* add upper_dev to every dev's lower device */
5063 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5064 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
5065 i
->dev
->name
, upper_dev
->name
);
5066 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
5068 goto rollback_lower_mesh
;
5071 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
5074 rollback_lower_mesh
:
5076 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5079 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5084 rollback_upper_mesh
:
5086 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5089 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5097 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5098 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5099 if (i
== to_i
&& j
== to_j
)
5101 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5107 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5113 * netdev_upper_dev_link - Add a link to the upper device
5115 * @upper_dev: new upper device
5117 * Adds a link to device which is upper to this one. The caller must hold
5118 * the RTNL lock. On a failure a negative errno code is returned.
5119 * On success the reference counts are adjusted and the function
5122 int netdev_upper_dev_link(struct net_device
*dev
,
5123 struct net_device
*upper_dev
)
5125 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
);
5127 EXPORT_SYMBOL(netdev_upper_dev_link
);
5130 * netdev_master_upper_dev_link - Add a master link to the upper device
5132 * @upper_dev: new upper device
5134 * Adds a link to device which is upper to this one. In this case, only
5135 * one master upper device can be linked, although other non-master devices
5136 * might be linked as well. The caller must hold the RTNL lock.
5137 * On a failure a negative errno code is returned. On success the reference
5138 * counts are adjusted and the function returns zero.
5140 int netdev_master_upper_dev_link(struct net_device
*dev
,
5141 struct net_device
*upper_dev
)
5143 return __netdev_upper_dev_link(dev
, upper_dev
, true, NULL
);
5145 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
5147 int netdev_master_upper_dev_link_private(struct net_device
*dev
,
5148 struct net_device
*upper_dev
,
5151 return __netdev_upper_dev_link(dev
, upper_dev
, true, private);
5153 EXPORT_SYMBOL(netdev_master_upper_dev_link_private
);
5156 * netdev_upper_dev_unlink - Removes a link to upper device
5158 * @upper_dev: new upper device
5160 * Removes a link to device which is upper to this one. The caller must hold
5163 void netdev_upper_dev_unlink(struct net_device
*dev
,
5164 struct net_device
*upper_dev
)
5166 struct netdev_adjacent
*i
, *j
;
5169 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5171 /* Here is the tricky part. We must remove all dev's lower
5172 * devices from all upper_dev's upper devices and vice
5173 * versa, to maintain the graph relationship.
5175 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5176 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
5177 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5179 /* remove also the devices itself from lower/upper device
5182 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5183 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5185 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
5186 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5188 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
5190 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
5192 void netdev_adjacent_rename_links(struct net_device
*dev
, char *oldname
)
5194 struct netdev_adjacent
*iter
;
5196 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5197 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5198 &iter
->dev
->adj_list
.lower
);
5199 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5200 &iter
->dev
->adj_list
.lower
);
5203 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5204 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5205 &iter
->dev
->adj_list
.upper
);
5206 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5207 &iter
->dev
->adj_list
.upper
);
5211 void *netdev_lower_dev_get_private(struct net_device
*dev
,
5212 struct net_device
*lower_dev
)
5214 struct netdev_adjacent
*lower
;
5218 lower
= __netdev_find_adj(dev
, lower_dev
, &dev
->adj_list
.lower
);
5222 return lower
->private;
5224 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
5227 int dev_get_nest_level(struct net_device
*dev
,
5228 bool (*type_check
)(struct net_device
*dev
))
5230 struct net_device
*lower
= NULL
;
5231 struct list_head
*iter
;
5237 netdev_for_each_lower_dev(dev
, lower
, iter
) {
5238 nest
= dev_get_nest_level(lower
, type_check
);
5239 if (max_nest
< nest
)
5243 if (type_check(dev
))
5248 EXPORT_SYMBOL(dev_get_nest_level
);
5250 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
5252 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5254 if (ops
->ndo_change_rx_flags
)
5255 ops
->ndo_change_rx_flags(dev
, flags
);
5258 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
5260 unsigned int old_flags
= dev
->flags
;
5266 dev
->flags
|= IFF_PROMISC
;
5267 dev
->promiscuity
+= inc
;
5268 if (dev
->promiscuity
== 0) {
5271 * If inc causes overflow, untouch promisc and return error.
5274 dev
->flags
&= ~IFF_PROMISC
;
5276 dev
->promiscuity
-= inc
;
5277 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5282 if (dev
->flags
!= old_flags
) {
5283 pr_info("device %s %s promiscuous mode\n",
5285 dev
->flags
& IFF_PROMISC
? "entered" : "left");
5286 if (audit_enabled
) {
5287 current_uid_gid(&uid
, &gid
);
5288 audit_log(current
->audit_context
, GFP_ATOMIC
,
5289 AUDIT_ANOM_PROMISCUOUS
,
5290 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5291 dev
->name
, (dev
->flags
& IFF_PROMISC
),
5292 (old_flags
& IFF_PROMISC
),
5293 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
5294 from_kuid(&init_user_ns
, uid
),
5295 from_kgid(&init_user_ns
, gid
),
5296 audit_get_sessionid(current
));
5299 dev_change_rx_flags(dev
, IFF_PROMISC
);
5302 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
5307 * dev_set_promiscuity - update promiscuity count on a device
5311 * Add or remove promiscuity from a device. While the count in the device
5312 * remains above zero the interface remains promiscuous. Once it hits zero
5313 * the device reverts back to normal filtering operation. A negative inc
5314 * value is used to drop promiscuity on the device.
5315 * Return 0 if successful or a negative errno code on error.
5317 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
5319 unsigned int old_flags
= dev
->flags
;
5322 err
= __dev_set_promiscuity(dev
, inc
, true);
5325 if (dev
->flags
!= old_flags
)
5326 dev_set_rx_mode(dev
);
5329 EXPORT_SYMBOL(dev_set_promiscuity
);
5331 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
5333 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5337 dev
->flags
|= IFF_ALLMULTI
;
5338 dev
->allmulti
+= inc
;
5339 if (dev
->allmulti
== 0) {
5342 * If inc causes overflow, untouch allmulti and return error.
5345 dev
->flags
&= ~IFF_ALLMULTI
;
5347 dev
->allmulti
-= inc
;
5348 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5353 if (dev
->flags
^ old_flags
) {
5354 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
5355 dev_set_rx_mode(dev
);
5357 __dev_notify_flags(dev
, old_flags
,
5358 dev
->gflags
^ old_gflags
);
5364 * dev_set_allmulti - update allmulti count on a device
5368 * Add or remove reception of all multicast frames to a device. While the
5369 * count in the device remains above zero the interface remains listening
5370 * to all interfaces. Once it hits zero the device reverts back to normal
5371 * filtering operation. A negative @inc value is used to drop the counter
5372 * when releasing a resource needing all multicasts.
5373 * Return 0 if successful or a negative errno code on error.
5376 int dev_set_allmulti(struct net_device
*dev
, int inc
)
5378 return __dev_set_allmulti(dev
, inc
, true);
5380 EXPORT_SYMBOL(dev_set_allmulti
);
5383 * Upload unicast and multicast address lists to device and
5384 * configure RX filtering. When the device doesn't support unicast
5385 * filtering it is put in promiscuous mode while unicast addresses
5388 void __dev_set_rx_mode(struct net_device
*dev
)
5390 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5392 /* dev_open will call this function so the list will stay sane. */
5393 if (!(dev
->flags
&IFF_UP
))
5396 if (!netif_device_present(dev
))
5399 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
5400 /* Unicast addresses changes may only happen under the rtnl,
5401 * therefore calling __dev_set_promiscuity here is safe.
5403 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
5404 __dev_set_promiscuity(dev
, 1, false);
5405 dev
->uc_promisc
= true;
5406 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
5407 __dev_set_promiscuity(dev
, -1, false);
5408 dev
->uc_promisc
= false;
5412 if (ops
->ndo_set_rx_mode
)
5413 ops
->ndo_set_rx_mode(dev
);
5416 void dev_set_rx_mode(struct net_device
*dev
)
5418 netif_addr_lock_bh(dev
);
5419 __dev_set_rx_mode(dev
);
5420 netif_addr_unlock_bh(dev
);
5424 * dev_get_flags - get flags reported to userspace
5427 * Get the combination of flag bits exported through APIs to userspace.
5429 unsigned int dev_get_flags(const struct net_device
*dev
)
5433 flags
= (dev
->flags
& ~(IFF_PROMISC
|
5438 (dev
->gflags
& (IFF_PROMISC
|
5441 if (netif_running(dev
)) {
5442 if (netif_oper_up(dev
))
5443 flags
|= IFF_RUNNING
;
5444 if (netif_carrier_ok(dev
))
5445 flags
|= IFF_LOWER_UP
;
5446 if (netif_dormant(dev
))
5447 flags
|= IFF_DORMANT
;
5452 EXPORT_SYMBOL(dev_get_flags
);
5454 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5456 unsigned int old_flags
= dev
->flags
;
5462 * Set the flags on our device.
5465 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
5466 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
5468 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
5472 * Load in the correct multicast list now the flags have changed.
5475 if ((old_flags
^ flags
) & IFF_MULTICAST
)
5476 dev_change_rx_flags(dev
, IFF_MULTICAST
);
5478 dev_set_rx_mode(dev
);
5481 * Have we downed the interface. We handle IFF_UP ourselves
5482 * according to user attempts to set it, rather than blindly
5487 if ((old_flags
^ flags
) & IFF_UP
)
5488 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
5490 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
5491 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
5492 unsigned int old_flags
= dev
->flags
;
5494 dev
->gflags
^= IFF_PROMISC
;
5496 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
5497 if (dev
->flags
!= old_flags
)
5498 dev_set_rx_mode(dev
);
5501 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5502 is important. Some (broken) drivers set IFF_PROMISC, when
5503 IFF_ALLMULTI is requested not asking us and not reporting.
5505 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
5506 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
5508 dev
->gflags
^= IFF_ALLMULTI
;
5509 __dev_set_allmulti(dev
, inc
, false);
5515 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
5516 unsigned int gchanges
)
5518 unsigned int changes
= dev
->flags
^ old_flags
;
5521 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
5523 if (changes
& IFF_UP
) {
5524 if (dev
->flags
& IFF_UP
)
5525 call_netdevice_notifiers(NETDEV_UP
, dev
);
5527 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
5530 if (dev
->flags
& IFF_UP
&&
5531 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
5532 struct netdev_notifier_change_info change_info
;
5534 change_info
.flags_changed
= changes
;
5535 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
5541 * dev_change_flags - change device settings
5543 * @flags: device state flags
5545 * Change settings on device based state flags. The flags are
5546 * in the userspace exported format.
5548 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5551 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5553 ret
= __dev_change_flags(dev
, flags
);
5557 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
5558 __dev_notify_flags(dev
, old_flags
, changes
);
5561 EXPORT_SYMBOL(dev_change_flags
);
5563 static int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5565 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5567 if (ops
->ndo_change_mtu
)
5568 return ops
->ndo_change_mtu(dev
, new_mtu
);
5575 * dev_set_mtu - Change maximum transfer unit
5577 * @new_mtu: new transfer unit
5579 * Change the maximum transfer size of the network device.
5581 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5585 if (new_mtu
== dev
->mtu
)
5588 /* MTU must be positive. */
5592 if (!netif_device_present(dev
))
5595 err
= call_netdevice_notifiers(NETDEV_PRECHANGEMTU
, dev
);
5596 err
= notifier_to_errno(err
);
5600 orig_mtu
= dev
->mtu
;
5601 err
= __dev_set_mtu(dev
, new_mtu
);
5604 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5605 err
= notifier_to_errno(err
);
5607 /* setting mtu back and notifying everyone again,
5608 * so that they have a chance to revert changes.
5610 __dev_set_mtu(dev
, orig_mtu
);
5611 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5616 EXPORT_SYMBOL(dev_set_mtu
);
5619 * dev_set_group - Change group this device belongs to
5621 * @new_group: group this device should belong to
5623 void dev_set_group(struct net_device
*dev
, int new_group
)
5625 dev
->group
= new_group
;
5627 EXPORT_SYMBOL(dev_set_group
);
5630 * dev_set_mac_address - Change Media Access Control Address
5634 * Change the hardware (MAC) address of the device
5636 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
5638 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5641 if (!ops
->ndo_set_mac_address
)
5643 if (sa
->sa_family
!= dev
->type
)
5645 if (!netif_device_present(dev
))
5647 err
= ops
->ndo_set_mac_address(dev
, sa
);
5650 dev
->addr_assign_type
= NET_ADDR_SET
;
5651 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
5652 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5655 EXPORT_SYMBOL(dev_set_mac_address
);
5658 * dev_change_carrier - Change device carrier
5660 * @new_carrier: new value
5662 * Change device carrier
5664 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
5666 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5668 if (!ops
->ndo_change_carrier
)
5670 if (!netif_device_present(dev
))
5672 return ops
->ndo_change_carrier(dev
, new_carrier
);
5674 EXPORT_SYMBOL(dev_change_carrier
);
5677 * dev_get_phys_port_id - Get device physical port ID
5681 * Get device physical port ID
5683 int dev_get_phys_port_id(struct net_device
*dev
,
5684 struct netdev_phys_port_id
*ppid
)
5686 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5688 if (!ops
->ndo_get_phys_port_id
)
5690 return ops
->ndo_get_phys_port_id(dev
, ppid
);
5692 EXPORT_SYMBOL(dev_get_phys_port_id
);
5695 * dev_new_index - allocate an ifindex
5696 * @net: the applicable net namespace
5698 * Returns a suitable unique value for a new device interface
5699 * number. The caller must hold the rtnl semaphore or the
5700 * dev_base_lock to be sure it remains unique.
5702 static int dev_new_index(struct net
*net
)
5704 int ifindex
= net
->ifindex
;
5708 if (!__dev_get_by_index(net
, ifindex
))
5709 return net
->ifindex
= ifindex
;
5713 /* Delayed registration/unregisteration */
5714 static LIST_HEAD(net_todo_list
);
5715 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
5717 static void net_set_todo(struct net_device
*dev
)
5719 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5720 dev_net(dev
)->dev_unreg_count
++;
5723 static void rollback_registered_many(struct list_head
*head
)
5725 struct net_device
*dev
, *tmp
;
5726 LIST_HEAD(close_head
);
5728 BUG_ON(dev_boot_phase
);
5731 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5732 /* Some devices call without registering
5733 * for initialization unwind. Remove those
5734 * devices and proceed with the remaining.
5736 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5737 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5741 list_del(&dev
->unreg_list
);
5744 dev
->dismantle
= true;
5745 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
5748 /* If device is running, close it first. */
5749 list_for_each_entry(dev
, head
, unreg_list
)
5750 list_add_tail(&dev
->close_list
, &close_head
);
5751 dev_close_many(&close_head
);
5753 list_for_each_entry(dev
, head
, unreg_list
) {
5754 /* And unlink it from device chain. */
5755 unlist_netdevice(dev
);
5757 dev
->reg_state
= NETREG_UNREGISTERING
;
5762 list_for_each_entry(dev
, head
, unreg_list
) {
5763 /* Shutdown queueing discipline. */
5767 /* Notify protocols, that we are about to destroy
5768 this device. They should clean all the things.
5770 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5773 * Flush the unicast and multicast chains
5778 if (dev
->netdev_ops
->ndo_uninit
)
5779 dev
->netdev_ops
->ndo_uninit(dev
);
5781 if (!dev
->rtnl_link_ops
||
5782 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5783 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
5785 /* Notifier chain MUST detach us all upper devices. */
5786 WARN_ON(netdev_has_any_upper_dev(dev
));
5788 /* Remove entries from kobject tree */
5789 netdev_unregister_kobject(dev
);
5791 /* Remove XPS queueing entries */
5792 netif_reset_xps_queues_gt(dev
, 0);
5798 list_for_each_entry(dev
, head
, unreg_list
)
5802 static void rollback_registered(struct net_device
*dev
)
5806 list_add(&dev
->unreg_list
, &single
);
5807 rollback_registered_many(&single
);
5811 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5812 netdev_features_t features
)
5814 /* Fix illegal checksum combinations */
5815 if ((features
& NETIF_F_HW_CSUM
) &&
5816 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5817 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5818 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5821 /* TSO requires that SG is present as well. */
5822 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5823 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5824 features
&= ~NETIF_F_ALL_TSO
;
5827 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
5828 !(features
& NETIF_F_IP_CSUM
)) {
5829 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
5830 features
&= ~NETIF_F_TSO
;
5831 features
&= ~NETIF_F_TSO_ECN
;
5834 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
5835 !(features
& NETIF_F_IPV6_CSUM
)) {
5836 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
5837 features
&= ~NETIF_F_TSO6
;
5840 /* TSO ECN requires that TSO is present as well. */
5841 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5842 features
&= ~NETIF_F_TSO_ECN
;
5844 /* Software GSO depends on SG. */
5845 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5846 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5847 features
&= ~NETIF_F_GSO
;
5850 /* UFO needs SG and checksumming */
5851 if (features
& NETIF_F_UFO
) {
5852 /* maybe split UFO into V4 and V6? */
5853 if (!((features
& NETIF_F_GEN_CSUM
) ||
5854 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5855 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5857 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5858 features
&= ~NETIF_F_UFO
;
5861 if (!(features
& NETIF_F_SG
)) {
5863 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5864 features
&= ~NETIF_F_UFO
;
5868 #ifdef CONFIG_NET_RX_BUSY_POLL
5869 if (dev
->netdev_ops
->ndo_busy_poll
)
5870 features
|= NETIF_F_BUSY_POLL
;
5873 features
&= ~NETIF_F_BUSY_POLL
;
5878 int __netdev_update_features(struct net_device
*dev
)
5880 netdev_features_t features
;
5885 features
= netdev_get_wanted_features(dev
);
5887 if (dev
->netdev_ops
->ndo_fix_features
)
5888 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5890 /* driver might be less strict about feature dependencies */
5891 features
= netdev_fix_features(dev
, features
);
5893 if (dev
->features
== features
)
5896 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5897 &dev
->features
, &features
);
5899 if (dev
->netdev_ops
->ndo_set_features
)
5900 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5902 if (unlikely(err
< 0)) {
5904 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5905 err
, &features
, &dev
->features
);
5910 dev
->features
= features
;
5916 * netdev_update_features - recalculate device features
5917 * @dev: the device to check
5919 * Recalculate dev->features set and send notifications if it
5920 * has changed. Should be called after driver or hardware dependent
5921 * conditions might have changed that influence the features.
5923 void netdev_update_features(struct net_device
*dev
)
5925 if (__netdev_update_features(dev
))
5926 netdev_features_change(dev
);
5928 EXPORT_SYMBOL(netdev_update_features
);
5931 * netdev_change_features - recalculate device features
5932 * @dev: the device to check
5934 * Recalculate dev->features set and send notifications even
5935 * if they have not changed. Should be called instead of
5936 * netdev_update_features() if also dev->vlan_features might
5937 * have changed to allow the changes to be propagated to stacked
5940 void netdev_change_features(struct net_device
*dev
)
5942 __netdev_update_features(dev
);
5943 netdev_features_change(dev
);
5945 EXPORT_SYMBOL(netdev_change_features
);
5948 * netif_stacked_transfer_operstate - transfer operstate
5949 * @rootdev: the root or lower level device to transfer state from
5950 * @dev: the device to transfer operstate to
5952 * Transfer operational state from root to device. This is normally
5953 * called when a stacking relationship exists between the root
5954 * device and the device(a leaf device).
5956 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5957 struct net_device
*dev
)
5959 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5960 netif_dormant_on(dev
);
5962 netif_dormant_off(dev
);
5964 if (netif_carrier_ok(rootdev
)) {
5965 if (!netif_carrier_ok(dev
))
5966 netif_carrier_on(dev
);
5968 if (netif_carrier_ok(dev
))
5969 netif_carrier_off(dev
);
5972 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5975 static int netif_alloc_rx_queues(struct net_device
*dev
)
5977 unsigned int i
, count
= dev
->num_rx_queues
;
5978 struct netdev_rx_queue
*rx
;
5982 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5988 for (i
= 0; i
< count
; i
++)
5994 static void netdev_init_one_queue(struct net_device
*dev
,
5995 struct netdev_queue
*queue
, void *_unused
)
5997 /* Initialize queue lock */
5998 spin_lock_init(&queue
->_xmit_lock
);
5999 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
6000 queue
->xmit_lock_owner
= -1;
6001 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
6004 dql_init(&queue
->dql
, HZ
);
6008 static void netif_free_tx_queues(struct net_device
*dev
)
6013 static int netif_alloc_netdev_queues(struct net_device
*dev
)
6015 unsigned int count
= dev
->num_tx_queues
;
6016 struct netdev_queue
*tx
;
6017 size_t sz
= count
* sizeof(*tx
);
6019 BUG_ON(count
< 1 || count
> 0xffff);
6021 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6029 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
6030 spin_lock_init(&dev
->tx_global_lock
);
6036 * register_netdevice - register a network device
6037 * @dev: device to register
6039 * Take a completed network device structure and add it to the kernel
6040 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6041 * chain. 0 is returned on success. A negative errno code is returned
6042 * on a failure to set up the device, or if the name is a duplicate.
6044 * Callers must hold the rtnl semaphore. You may want
6045 * register_netdev() instead of this.
6048 * The locking appears insufficient to guarantee two parallel registers
6049 * will not get the same name.
6052 int register_netdevice(struct net_device
*dev
)
6055 struct net
*net
= dev_net(dev
);
6057 BUG_ON(dev_boot_phase
);
6062 /* When net_device's are persistent, this will be fatal. */
6063 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
6066 spin_lock_init(&dev
->addr_list_lock
);
6067 netdev_set_addr_lockdep_class(dev
);
6071 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
6075 /* Init, if this function is available */
6076 if (dev
->netdev_ops
->ndo_init
) {
6077 ret
= dev
->netdev_ops
->ndo_init(dev
);
6085 if (((dev
->hw_features
| dev
->features
) &
6086 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
6087 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
6088 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
6089 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
6096 dev
->ifindex
= dev_new_index(net
);
6097 else if (__dev_get_by_index(net
, dev
->ifindex
))
6100 if (dev
->iflink
== -1)
6101 dev
->iflink
= dev
->ifindex
;
6103 /* Transfer changeable features to wanted_features and enable
6104 * software offloads (GSO and GRO).
6106 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
6107 dev
->features
|= NETIF_F_SOFT_FEATURES
;
6108 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
6110 if (!(dev
->flags
& IFF_LOOPBACK
)) {
6111 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
6114 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6116 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
6118 /* Make NETIF_F_SG inheritable to tunnel devices.
6120 dev
->hw_enc_features
|= NETIF_F_SG
;
6122 /* Make NETIF_F_SG inheritable to MPLS.
6124 dev
->mpls_features
|= NETIF_F_SG
;
6126 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
6127 ret
= notifier_to_errno(ret
);
6131 ret
= netdev_register_kobject(dev
);
6134 dev
->reg_state
= NETREG_REGISTERED
;
6136 __netdev_update_features(dev
);
6139 * Default initial state at registry is that the
6140 * device is present.
6143 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6145 linkwatch_init_dev(dev
);
6147 dev_init_scheduler(dev
);
6149 list_netdevice(dev
);
6150 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6152 /* If the device has permanent device address, driver should
6153 * set dev_addr and also addr_assign_type should be set to
6154 * NET_ADDR_PERM (default value).
6156 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
6157 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
6159 /* Notify protocols, that a new device appeared. */
6160 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6161 ret
= notifier_to_errno(ret
);
6163 rollback_registered(dev
);
6164 dev
->reg_state
= NETREG_UNREGISTERED
;
6167 * Prevent userspace races by waiting until the network
6168 * device is fully setup before sending notifications.
6170 if (!dev
->rtnl_link_ops
||
6171 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6172 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6178 if (dev
->netdev_ops
->ndo_uninit
)
6179 dev
->netdev_ops
->ndo_uninit(dev
);
6182 EXPORT_SYMBOL(register_netdevice
);
6185 * init_dummy_netdev - init a dummy network device for NAPI
6186 * @dev: device to init
6188 * This takes a network device structure and initialize the minimum
6189 * amount of fields so it can be used to schedule NAPI polls without
6190 * registering a full blown interface. This is to be used by drivers
6191 * that need to tie several hardware interfaces to a single NAPI
6192 * poll scheduler due to HW limitations.
6194 int init_dummy_netdev(struct net_device
*dev
)
6196 /* Clear everything. Note we don't initialize spinlocks
6197 * are they aren't supposed to be taken by any of the
6198 * NAPI code and this dummy netdev is supposed to be
6199 * only ever used for NAPI polls
6201 memset(dev
, 0, sizeof(struct net_device
));
6203 /* make sure we BUG if trying to hit standard
6204 * register/unregister code path
6206 dev
->reg_state
= NETREG_DUMMY
;
6208 /* NAPI wants this */
6209 INIT_LIST_HEAD(&dev
->napi_list
);
6211 /* a dummy interface is started by default */
6212 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6213 set_bit(__LINK_STATE_START
, &dev
->state
);
6215 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6216 * because users of this 'device' dont need to change
6222 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
6226 * register_netdev - register a network device
6227 * @dev: device to register
6229 * Take a completed network device structure and add it to the kernel
6230 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6231 * chain. 0 is returned on success. A negative errno code is returned
6232 * on a failure to set up the device, or if the name is a duplicate.
6234 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6235 * and expands the device name if you passed a format string to
6238 int register_netdev(struct net_device
*dev
)
6243 err
= register_netdevice(dev
);
6247 EXPORT_SYMBOL(register_netdev
);
6249 int netdev_refcnt_read(const struct net_device
*dev
)
6253 for_each_possible_cpu(i
)
6254 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
6257 EXPORT_SYMBOL(netdev_refcnt_read
);
6260 * netdev_wait_allrefs - wait until all references are gone.
6261 * @dev: target net_device
6263 * This is called when unregistering network devices.
6265 * Any protocol or device that holds a reference should register
6266 * for netdevice notification, and cleanup and put back the
6267 * reference if they receive an UNREGISTER event.
6268 * We can get stuck here if buggy protocols don't correctly
6271 static void netdev_wait_allrefs(struct net_device
*dev
)
6273 unsigned long rebroadcast_time
, warning_time
;
6276 linkwatch_forget_dev(dev
);
6278 rebroadcast_time
= warning_time
= jiffies
;
6279 refcnt
= netdev_refcnt_read(dev
);
6281 while (refcnt
!= 0) {
6282 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
6285 /* Rebroadcast unregister notification */
6286 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6292 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6293 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
6295 /* We must not have linkwatch events
6296 * pending on unregister. If this
6297 * happens, we simply run the queue
6298 * unscheduled, resulting in a noop
6301 linkwatch_run_queue();
6306 rebroadcast_time
= jiffies
;
6311 refcnt
= netdev_refcnt_read(dev
);
6313 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
6314 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6316 warning_time
= jiffies
;
6325 * register_netdevice(x1);
6326 * register_netdevice(x2);
6328 * unregister_netdevice(y1);
6329 * unregister_netdevice(y2);
6335 * We are invoked by rtnl_unlock().
6336 * This allows us to deal with problems:
6337 * 1) We can delete sysfs objects which invoke hotplug
6338 * without deadlocking with linkwatch via keventd.
6339 * 2) Since we run with the RTNL semaphore not held, we can sleep
6340 * safely in order to wait for the netdev refcnt to drop to zero.
6342 * We must not return until all unregister events added during
6343 * the interval the lock was held have been completed.
6345 void netdev_run_todo(void)
6347 struct list_head list
;
6349 /* Snapshot list, allow later requests */
6350 list_replace_init(&net_todo_list
, &list
);
6355 /* Wait for rcu callbacks to finish before next phase */
6356 if (!list_empty(&list
))
6359 while (!list_empty(&list
)) {
6360 struct net_device
*dev
6361 = list_first_entry(&list
, struct net_device
, todo_list
);
6362 list_del(&dev
->todo_list
);
6365 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6368 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
6369 pr_err("network todo '%s' but state %d\n",
6370 dev
->name
, dev
->reg_state
);
6375 dev
->reg_state
= NETREG_UNREGISTERED
;
6377 on_each_cpu(flush_backlog
, dev
, 1);
6379 netdev_wait_allrefs(dev
);
6382 BUG_ON(netdev_refcnt_read(dev
));
6383 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
6384 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
6385 WARN_ON(dev
->dn_ptr
);
6387 if (dev
->destructor
)
6388 dev
->destructor(dev
);
6390 /* Report a network device has been unregistered */
6392 dev_net(dev
)->dev_unreg_count
--;
6394 wake_up(&netdev_unregistering_wq
);
6396 /* Free network device */
6397 kobject_put(&dev
->dev
.kobj
);
6401 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6402 * fields in the same order, with only the type differing.
6404 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
6405 const struct net_device_stats
*netdev_stats
)
6407 #if BITS_PER_LONG == 64
6408 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
6409 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
6411 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
6412 const unsigned long *src
= (const unsigned long *)netdev_stats
;
6413 u64
*dst
= (u64
*)stats64
;
6415 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
6416 sizeof(*stats64
) / sizeof(u64
));
6417 for (i
= 0; i
< n
; i
++)
6421 EXPORT_SYMBOL(netdev_stats_to_stats64
);
6424 * dev_get_stats - get network device statistics
6425 * @dev: device to get statistics from
6426 * @storage: place to store stats
6428 * Get network statistics from device. Return @storage.
6429 * The device driver may provide its own method by setting
6430 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6431 * otherwise the internal statistics structure is used.
6433 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
6434 struct rtnl_link_stats64
*storage
)
6436 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6438 if (ops
->ndo_get_stats64
) {
6439 memset(storage
, 0, sizeof(*storage
));
6440 ops
->ndo_get_stats64(dev
, storage
);
6441 } else if (ops
->ndo_get_stats
) {
6442 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
6444 netdev_stats_to_stats64(storage
, &dev
->stats
);
6446 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
6447 storage
->tx_dropped
+= atomic_long_read(&dev
->tx_dropped
);
6450 EXPORT_SYMBOL(dev_get_stats
);
6452 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
6454 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
6456 #ifdef CONFIG_NET_CLS_ACT
6459 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
6462 netdev_init_one_queue(dev
, queue
, NULL
);
6463 queue
->qdisc
= &noop_qdisc
;
6464 queue
->qdisc_sleeping
= &noop_qdisc
;
6465 rcu_assign_pointer(dev
->ingress_queue
, queue
);
6470 static const struct ethtool_ops default_ethtool_ops
;
6472 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
6473 const struct ethtool_ops
*ops
)
6475 if (dev
->ethtool_ops
== &default_ethtool_ops
)
6476 dev
->ethtool_ops
= ops
;
6478 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
6480 void netdev_freemem(struct net_device
*dev
)
6482 char *addr
= (char *)dev
- dev
->padded
;
6488 * alloc_netdev_mqs - allocate network device
6489 * @sizeof_priv: size of private data to allocate space for
6490 * @name: device name format string
6491 * @name_assign_type: origin of device name
6492 * @setup: callback to initialize device
6493 * @txqs: the number of TX subqueues to allocate
6494 * @rxqs: the number of RX subqueues to allocate
6496 * Allocates a struct net_device with private data area for driver use
6497 * and performs basic initialization. Also allocates subqueue structs
6498 * for each queue on the device.
6500 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
6501 unsigned char name_assign_type
,
6502 void (*setup
)(struct net_device
*),
6503 unsigned int txqs
, unsigned int rxqs
)
6505 struct net_device
*dev
;
6507 struct net_device
*p
;
6509 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
6512 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6518 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6523 alloc_size
= sizeof(struct net_device
);
6525 /* ensure 32-byte alignment of private area */
6526 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
6527 alloc_size
+= sizeof_priv
;
6529 /* ensure 32-byte alignment of whole construct */
6530 alloc_size
+= NETDEV_ALIGN
- 1;
6532 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6534 p
= vzalloc(alloc_size
);
6538 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
6539 dev
->padded
= (char *)dev
- (char *)p
;
6541 dev
->pcpu_refcnt
= alloc_percpu(int);
6542 if (!dev
->pcpu_refcnt
)
6545 if (dev_addr_init(dev
))
6551 dev_net_set(dev
, &init_net
);
6553 dev
->gso_max_size
= GSO_MAX_SIZE
;
6554 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6556 INIT_LIST_HEAD(&dev
->napi_list
);
6557 INIT_LIST_HEAD(&dev
->unreg_list
);
6558 INIT_LIST_HEAD(&dev
->close_list
);
6559 INIT_LIST_HEAD(&dev
->link_watch_list
);
6560 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
6561 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
6562 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
6563 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
6564 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
6567 dev
->num_tx_queues
= txqs
;
6568 dev
->real_num_tx_queues
= txqs
;
6569 if (netif_alloc_netdev_queues(dev
))
6573 dev
->num_rx_queues
= rxqs
;
6574 dev
->real_num_rx_queues
= rxqs
;
6575 if (netif_alloc_rx_queues(dev
))
6579 strcpy(dev
->name
, name
);
6580 dev
->name_assign_type
= name_assign_type
;
6581 dev
->group
= INIT_NETDEV_GROUP
;
6582 if (!dev
->ethtool_ops
)
6583 dev
->ethtool_ops
= &default_ethtool_ops
;
6591 free_percpu(dev
->pcpu_refcnt
);
6593 netdev_freemem(dev
);
6596 EXPORT_SYMBOL(alloc_netdev_mqs
);
6599 * free_netdev - free network device
6602 * This function does the last stage of destroying an allocated device
6603 * interface. The reference to the device object is released.
6604 * If this is the last reference then it will be freed.
6606 void free_netdev(struct net_device
*dev
)
6608 struct napi_struct
*p
, *n
;
6610 release_net(dev_net(dev
));
6612 netif_free_tx_queues(dev
);
6617 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6619 /* Flush device addresses */
6620 dev_addr_flush(dev
);
6622 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6625 free_percpu(dev
->pcpu_refcnt
);
6626 dev
->pcpu_refcnt
= NULL
;
6628 /* Compatibility with error handling in drivers */
6629 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6630 netdev_freemem(dev
);
6634 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6635 dev
->reg_state
= NETREG_RELEASED
;
6637 /* will free via device release */
6638 put_device(&dev
->dev
);
6640 EXPORT_SYMBOL(free_netdev
);
6643 * synchronize_net - Synchronize with packet receive processing
6645 * Wait for packets currently being received to be done.
6646 * Does not block later packets from starting.
6648 void synchronize_net(void)
6651 if (rtnl_is_locked())
6652 synchronize_rcu_expedited();
6656 EXPORT_SYMBOL(synchronize_net
);
6659 * unregister_netdevice_queue - remove device from the kernel
6663 * This function shuts down a device interface and removes it
6664 * from the kernel tables.
6665 * If head not NULL, device is queued to be unregistered later.
6667 * Callers must hold the rtnl semaphore. You may want
6668 * unregister_netdev() instead of this.
6671 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6676 list_move_tail(&dev
->unreg_list
, head
);
6678 rollback_registered(dev
);
6679 /* Finish processing unregister after unlock */
6683 EXPORT_SYMBOL(unregister_netdevice_queue
);
6686 * unregister_netdevice_many - unregister many devices
6687 * @head: list of devices
6689 * Note: As most callers use a stack allocated list_head,
6690 * we force a list_del() to make sure stack wont be corrupted later.
6692 void unregister_netdevice_many(struct list_head
*head
)
6694 struct net_device
*dev
;
6696 if (!list_empty(head
)) {
6697 rollback_registered_many(head
);
6698 list_for_each_entry(dev
, head
, unreg_list
)
6703 EXPORT_SYMBOL(unregister_netdevice_many
);
6706 * unregister_netdev - remove device from the kernel
6709 * This function shuts down a device interface and removes it
6710 * from the kernel tables.
6712 * This is just a wrapper for unregister_netdevice that takes
6713 * the rtnl semaphore. In general you want to use this and not
6714 * unregister_netdevice.
6716 void unregister_netdev(struct net_device
*dev
)
6719 unregister_netdevice(dev
);
6722 EXPORT_SYMBOL(unregister_netdev
);
6725 * dev_change_net_namespace - move device to different nethost namespace
6727 * @net: network namespace
6728 * @pat: If not NULL name pattern to try if the current device name
6729 * is already taken in the destination network namespace.
6731 * This function shuts down a device interface and moves it
6732 * to a new network namespace. On success 0 is returned, on
6733 * a failure a netagive errno code is returned.
6735 * Callers must hold the rtnl semaphore.
6738 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
6744 /* Don't allow namespace local devices to be moved. */
6746 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6749 /* Ensure the device has been registrered */
6750 if (dev
->reg_state
!= NETREG_REGISTERED
)
6753 /* Get out if there is nothing todo */
6755 if (net_eq(dev_net(dev
), net
))
6758 /* Pick the destination device name, and ensure
6759 * we can use it in the destination network namespace.
6762 if (__dev_get_by_name(net
, dev
->name
)) {
6763 /* We get here if we can't use the current device name */
6766 if (dev_get_valid_name(net
, dev
, pat
) < 0)
6771 * And now a mini version of register_netdevice unregister_netdevice.
6774 /* If device is running close it first. */
6777 /* And unlink it from device chain */
6779 unlist_netdevice(dev
);
6783 /* Shutdown queueing discipline. */
6786 /* Notify protocols, that we are about to destroy
6787 this device. They should clean all the things.
6789 Note that dev->reg_state stays at NETREG_REGISTERED.
6790 This is wanted because this way 8021q and macvlan know
6791 the device is just moving and can keep their slaves up.
6793 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6795 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6796 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
6799 * Flush the unicast and multicast chains
6804 /* Send a netdev-removed uevent to the old namespace */
6805 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
6807 /* Actually switch the network namespace */
6808 dev_net_set(dev
, net
);
6810 /* If there is an ifindex conflict assign a new one */
6811 if (__dev_get_by_index(net
, dev
->ifindex
)) {
6812 int iflink
= (dev
->iflink
== dev
->ifindex
);
6813 dev
->ifindex
= dev_new_index(net
);
6815 dev
->iflink
= dev
->ifindex
;
6818 /* Send a netdev-add uevent to the new namespace */
6819 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
6821 /* Fixup kobjects */
6822 err
= device_rename(&dev
->dev
, dev
->name
);
6825 /* Add the device back in the hashes */
6826 list_netdevice(dev
);
6828 /* Notify protocols, that a new device appeared. */
6829 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6832 * Prevent userspace races by waiting until the network
6833 * device is fully setup before sending notifications.
6835 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6842 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6844 static int dev_cpu_callback(struct notifier_block
*nfb
,
6845 unsigned long action
,
6848 struct sk_buff
**list_skb
;
6849 struct sk_buff
*skb
;
6850 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6851 struct softnet_data
*sd
, *oldsd
;
6853 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6856 local_irq_disable();
6857 cpu
= smp_processor_id();
6858 sd
= &per_cpu(softnet_data
, cpu
);
6859 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6861 /* Find end of our completion_queue. */
6862 list_skb
= &sd
->completion_queue
;
6864 list_skb
= &(*list_skb
)->next
;
6865 /* Append completion queue from offline CPU. */
6866 *list_skb
= oldsd
->completion_queue
;
6867 oldsd
->completion_queue
= NULL
;
6869 /* Append output queue from offline CPU. */
6870 if (oldsd
->output_queue
) {
6871 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6872 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6873 oldsd
->output_queue
= NULL
;
6874 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6876 /* Append NAPI poll list from offline CPU. */
6877 if (!list_empty(&oldsd
->poll_list
)) {
6878 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6879 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6882 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6885 /* Process offline CPU's input_pkt_queue */
6886 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6887 netif_rx_internal(skb
);
6888 input_queue_head_incr(oldsd
);
6890 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6891 netif_rx_internal(skb
);
6892 input_queue_head_incr(oldsd
);
6900 * netdev_increment_features - increment feature set by one
6901 * @all: current feature set
6902 * @one: new feature set
6903 * @mask: mask feature set
6905 * Computes a new feature set after adding a device with feature set
6906 * @one to the master device with current feature set @all. Will not
6907 * enable anything that is off in @mask. Returns the new feature set.
6909 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6910 netdev_features_t one
, netdev_features_t mask
)
6912 if (mask
& NETIF_F_GEN_CSUM
)
6913 mask
|= NETIF_F_ALL_CSUM
;
6914 mask
|= NETIF_F_VLAN_CHALLENGED
;
6916 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
6917 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
6919 /* If one device supports hw checksumming, set for all. */
6920 if (all
& NETIF_F_GEN_CSUM
)
6921 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6925 EXPORT_SYMBOL(netdev_increment_features
);
6927 static struct hlist_head
* __net_init
netdev_create_hash(void)
6930 struct hlist_head
*hash
;
6932 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6934 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6935 INIT_HLIST_HEAD(&hash
[i
]);
6940 /* Initialize per network namespace state */
6941 static int __net_init
netdev_init(struct net
*net
)
6943 if (net
!= &init_net
)
6944 INIT_LIST_HEAD(&net
->dev_base_head
);
6946 net
->dev_name_head
= netdev_create_hash();
6947 if (net
->dev_name_head
== NULL
)
6950 net
->dev_index_head
= netdev_create_hash();
6951 if (net
->dev_index_head
== NULL
)
6957 kfree(net
->dev_name_head
);
6963 * netdev_drivername - network driver for the device
6964 * @dev: network device
6966 * Determine network driver for device.
6968 const char *netdev_drivername(const struct net_device
*dev
)
6970 const struct device_driver
*driver
;
6971 const struct device
*parent
;
6972 const char *empty
= "";
6974 parent
= dev
->dev
.parent
;
6978 driver
= parent
->driver
;
6979 if (driver
&& driver
->name
)
6980 return driver
->name
;
6984 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
6985 struct va_format
*vaf
)
6989 if (dev
&& dev
->dev
.parent
) {
6990 r
= dev_printk_emit(level
[1] - '0',
6993 dev_driver_string(dev
->dev
.parent
),
6994 dev_name(dev
->dev
.parent
),
6995 netdev_name(dev
), netdev_reg_state(dev
),
6998 r
= printk("%s%s%s: %pV", level
, netdev_name(dev
),
6999 netdev_reg_state(dev
), vaf
);
7001 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
7007 int netdev_printk(const char *level
, const struct net_device
*dev
,
7008 const char *format
, ...)
7010 struct va_format vaf
;
7014 va_start(args
, format
);
7019 r
= __netdev_printk(level
, dev
, &vaf
);
7025 EXPORT_SYMBOL(netdev_printk
);
7027 #define define_netdev_printk_level(func, level) \
7028 int func(const struct net_device *dev, const char *fmt, ...) \
7031 struct va_format vaf; \
7034 va_start(args, fmt); \
7039 r = __netdev_printk(level, dev, &vaf); \
7045 EXPORT_SYMBOL(func);
7047 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
7048 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
7049 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
7050 define_netdev_printk_level(netdev_err
, KERN_ERR
);
7051 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
7052 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
7053 define_netdev_printk_level(netdev_info
, KERN_INFO
);
7055 static void __net_exit
netdev_exit(struct net
*net
)
7057 kfree(net
->dev_name_head
);
7058 kfree(net
->dev_index_head
);
7061 static struct pernet_operations __net_initdata netdev_net_ops
= {
7062 .init
= netdev_init
,
7063 .exit
= netdev_exit
,
7066 static void __net_exit
default_device_exit(struct net
*net
)
7068 struct net_device
*dev
, *aux
;
7070 * Push all migratable network devices back to the
7071 * initial network namespace
7074 for_each_netdev_safe(net
, dev
, aux
) {
7076 char fb_name
[IFNAMSIZ
];
7078 /* Ignore unmoveable devices (i.e. loopback) */
7079 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7082 /* Leave virtual devices for the generic cleanup */
7083 if (dev
->rtnl_link_ops
)
7086 /* Push remaining network devices to init_net */
7087 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
7088 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
7090 pr_emerg("%s: failed to move %s to init_net: %d\n",
7091 __func__
, dev
->name
, err
);
7098 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
7100 /* Return with the rtnl_lock held when there are no network
7101 * devices unregistering in any network namespace in net_list.
7108 prepare_to_wait(&netdev_unregistering_wq
, &wait
,
7109 TASK_UNINTERRUPTIBLE
);
7110 unregistering
= false;
7112 list_for_each_entry(net
, net_list
, exit_list
) {
7113 if (net
->dev_unreg_count
> 0) {
7114 unregistering
= true;
7123 finish_wait(&netdev_unregistering_wq
, &wait
);
7126 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
7128 /* At exit all network devices most be removed from a network
7129 * namespace. Do this in the reverse order of registration.
7130 * Do this across as many network namespaces as possible to
7131 * improve batching efficiency.
7133 struct net_device
*dev
;
7135 LIST_HEAD(dev_kill_list
);
7137 /* To prevent network device cleanup code from dereferencing
7138 * loopback devices or network devices that have been freed
7139 * wait here for all pending unregistrations to complete,
7140 * before unregistring the loopback device and allowing the
7141 * network namespace be freed.
7143 * The netdev todo list containing all network devices
7144 * unregistrations that happen in default_device_exit_batch
7145 * will run in the rtnl_unlock() at the end of
7146 * default_device_exit_batch.
7148 rtnl_lock_unregistering(net_list
);
7149 list_for_each_entry(net
, net_list
, exit_list
) {
7150 for_each_netdev_reverse(net
, dev
) {
7151 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
)
7152 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
7154 unregister_netdevice_queue(dev
, &dev_kill_list
);
7157 unregister_netdevice_many(&dev_kill_list
);
7161 static struct pernet_operations __net_initdata default_device_ops
= {
7162 .exit
= default_device_exit
,
7163 .exit_batch
= default_device_exit_batch
,
7167 * Initialize the DEV module. At boot time this walks the device list and
7168 * unhooks any devices that fail to initialise (normally hardware not
7169 * present) and leaves us with a valid list of present and active devices.
7174 * This is called single threaded during boot, so no need
7175 * to take the rtnl semaphore.
7177 static int __init
net_dev_init(void)
7179 int i
, rc
= -ENOMEM
;
7181 BUG_ON(!dev_boot_phase
);
7183 if (dev_proc_init())
7186 if (netdev_kobject_init())
7189 INIT_LIST_HEAD(&ptype_all
);
7190 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
7191 INIT_LIST_HEAD(&ptype_base
[i
]);
7193 INIT_LIST_HEAD(&offload_base
);
7195 if (register_pernet_subsys(&netdev_net_ops
))
7199 * Initialise the packet receive queues.
7202 for_each_possible_cpu(i
) {
7203 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
7205 skb_queue_head_init(&sd
->input_pkt_queue
);
7206 skb_queue_head_init(&sd
->process_queue
);
7207 INIT_LIST_HEAD(&sd
->poll_list
);
7208 sd
->output_queue_tailp
= &sd
->output_queue
;
7210 sd
->csd
.func
= rps_trigger_softirq
;
7215 sd
->backlog
.poll
= process_backlog
;
7216 sd
->backlog
.weight
= weight_p
;
7221 /* The loopback device is special if any other network devices
7222 * is present in a network namespace the loopback device must
7223 * be present. Since we now dynamically allocate and free the
7224 * loopback device ensure this invariant is maintained by
7225 * keeping the loopback device as the first device on the
7226 * list of network devices. Ensuring the loopback devices
7227 * is the first device that appears and the last network device
7230 if (register_pernet_device(&loopback_net_ops
))
7233 if (register_pernet_device(&default_device_ops
))
7236 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
7237 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
7239 hotcpu_notifier(dev_cpu_callback
, 0);
7246 subsys_initcall(net_dev_init
);