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 - 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 * rtnl_lock(), and result refcount is unchanged.
910 struct net_device
*__dev_get_by_flags(struct net
*net
, unsigned short if_flags
,
913 struct net_device
*dev
, *ret
;
918 for_each_netdev(net
, dev
) {
919 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
926 EXPORT_SYMBOL(__dev_get_by_flags
);
929 * dev_valid_name - check if name is okay for network device
932 * Network device names need to be valid file names to
933 * to allow sysfs to work. We also disallow any kind of
936 bool dev_valid_name(const char *name
)
940 if (strlen(name
) >= IFNAMSIZ
)
942 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
946 if (*name
== '/' || isspace(*name
))
952 EXPORT_SYMBOL(dev_valid_name
);
955 * __dev_alloc_name - allocate a name for a device
956 * @net: network namespace to allocate the device name in
957 * @name: name format string
958 * @buf: scratch buffer and result name string
960 * Passed a format string - eg "lt%d" it will try and find a suitable
961 * id. It scans list of devices to build up a free map, then chooses
962 * the first empty slot. The caller must hold the dev_base or rtnl lock
963 * while allocating the name and adding the device in order to avoid
965 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
966 * Returns the number of the unit assigned or a negative errno code.
969 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
973 const int max_netdevices
= 8*PAGE_SIZE
;
974 unsigned long *inuse
;
975 struct net_device
*d
;
977 p
= strnchr(name
, IFNAMSIZ
-1, '%');
980 * Verify the string as this thing may have come from
981 * the user. There must be either one "%d" and no other "%"
984 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
987 /* Use one page as a bit array of possible slots */
988 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
992 for_each_netdev(net
, d
) {
993 if (!sscanf(d
->name
, name
, &i
))
995 if (i
< 0 || i
>= max_netdevices
)
998 /* avoid cases where sscanf is not exact inverse of printf */
999 snprintf(buf
, IFNAMSIZ
, name
, i
);
1000 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
1004 i
= find_first_zero_bit(inuse
, max_netdevices
);
1005 free_page((unsigned long) inuse
);
1009 snprintf(buf
, IFNAMSIZ
, name
, i
);
1010 if (!__dev_get_by_name(net
, buf
))
1013 /* It is possible to run out of possible slots
1014 * when the name is long and there isn't enough space left
1015 * for the digits, or if all bits are used.
1021 * dev_alloc_name - allocate a name for a device
1023 * @name: name format string
1025 * Passed a format string - eg "lt%d" it will try and find a suitable
1026 * id. It scans list of devices to build up a free map, then chooses
1027 * the first empty slot. The caller must hold the dev_base or rtnl lock
1028 * while allocating the name and adding the device in order to avoid
1030 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1031 * Returns the number of the unit assigned or a negative errno code.
1034 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1040 BUG_ON(!dev_net(dev
));
1042 ret
= __dev_alloc_name(net
, name
, buf
);
1044 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1047 EXPORT_SYMBOL(dev_alloc_name
);
1049 static int dev_alloc_name_ns(struct net
*net
,
1050 struct net_device
*dev
,
1056 ret
= __dev_alloc_name(net
, name
, buf
);
1058 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1062 static int dev_get_valid_name(struct net
*net
,
1063 struct net_device
*dev
,
1068 if (!dev_valid_name(name
))
1071 if (strchr(name
, '%'))
1072 return dev_alloc_name_ns(net
, dev
, name
);
1073 else if (__dev_get_by_name(net
, name
))
1075 else if (dev
->name
!= name
)
1076 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1082 * dev_change_name - change name of a device
1084 * @newname: name (or format string) must be at least IFNAMSIZ
1086 * Change name of a device, can pass format strings "eth%d".
1089 int dev_change_name(struct net_device
*dev
, const char *newname
)
1091 unsigned char old_assign_type
;
1092 char oldname
[IFNAMSIZ
];
1098 BUG_ON(!dev_net(dev
));
1101 if (dev
->flags
& IFF_UP
)
1104 write_seqcount_begin(&devnet_rename_seq
);
1106 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1107 write_seqcount_end(&devnet_rename_seq
);
1111 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1113 err
= dev_get_valid_name(net
, dev
, newname
);
1115 write_seqcount_end(&devnet_rename_seq
);
1119 if (oldname
[0] && !strchr(oldname
, '%'))
1120 netdev_info(dev
, "renamed from %s\n", oldname
);
1122 old_assign_type
= dev
->name_assign_type
;
1123 dev
->name_assign_type
= NET_NAME_RENAMED
;
1126 ret
= device_rename(&dev
->dev
, dev
->name
);
1128 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1129 dev
->name_assign_type
= old_assign_type
;
1130 write_seqcount_end(&devnet_rename_seq
);
1134 write_seqcount_end(&devnet_rename_seq
);
1136 netdev_adjacent_rename_links(dev
, oldname
);
1138 write_lock_bh(&dev_base_lock
);
1139 hlist_del_rcu(&dev
->name_hlist
);
1140 write_unlock_bh(&dev_base_lock
);
1144 write_lock_bh(&dev_base_lock
);
1145 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1146 write_unlock_bh(&dev_base_lock
);
1148 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1149 ret
= notifier_to_errno(ret
);
1152 /* err >= 0 after dev_alloc_name() or stores the first errno */
1155 write_seqcount_begin(&devnet_rename_seq
);
1156 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1157 memcpy(oldname
, newname
, IFNAMSIZ
);
1158 dev
->name_assign_type
= old_assign_type
;
1159 old_assign_type
= NET_NAME_RENAMED
;
1162 pr_err("%s: name change rollback failed: %d\n",
1171 * dev_set_alias - change ifalias of a device
1173 * @alias: name up to IFALIASZ
1174 * @len: limit of bytes to copy from info
1176 * Set ifalias for a device,
1178 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1184 if (len
>= IFALIASZ
)
1188 kfree(dev
->ifalias
);
1189 dev
->ifalias
= NULL
;
1193 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1196 dev
->ifalias
= new_ifalias
;
1198 strlcpy(dev
->ifalias
, alias
, len
+1);
1204 * netdev_features_change - device changes features
1205 * @dev: device to cause notification
1207 * Called to indicate a device has changed features.
1209 void netdev_features_change(struct net_device
*dev
)
1211 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1213 EXPORT_SYMBOL(netdev_features_change
);
1216 * netdev_state_change - device changes state
1217 * @dev: device to cause notification
1219 * Called to indicate a device has changed state. This function calls
1220 * the notifier chains for netdev_chain and sends a NEWLINK message
1221 * to the routing socket.
1223 void netdev_state_change(struct net_device
*dev
)
1225 if (dev
->flags
& IFF_UP
) {
1226 struct netdev_notifier_change_info change_info
;
1228 change_info
.flags_changed
= 0;
1229 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
1231 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1234 EXPORT_SYMBOL(netdev_state_change
);
1237 * netdev_notify_peers - notify network peers about existence of @dev
1238 * @dev: network device
1240 * Generate traffic such that interested network peers are aware of
1241 * @dev, such as by generating a gratuitous ARP. This may be used when
1242 * a device wants to inform the rest of the network about some sort of
1243 * reconfiguration such as a failover event or virtual machine
1246 void netdev_notify_peers(struct net_device
*dev
)
1249 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1252 EXPORT_SYMBOL(netdev_notify_peers
);
1254 static int __dev_open(struct net_device
*dev
)
1256 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1261 if (!netif_device_present(dev
))
1264 /* Block netpoll from trying to do any rx path servicing.
1265 * If we don't do this there is a chance ndo_poll_controller
1266 * or ndo_poll may be running while we open the device
1268 netpoll_poll_disable(dev
);
1270 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1271 ret
= notifier_to_errno(ret
);
1275 set_bit(__LINK_STATE_START
, &dev
->state
);
1277 if (ops
->ndo_validate_addr
)
1278 ret
= ops
->ndo_validate_addr(dev
);
1280 if (!ret
&& ops
->ndo_open
)
1281 ret
= ops
->ndo_open(dev
);
1283 netpoll_poll_enable(dev
);
1286 clear_bit(__LINK_STATE_START
, &dev
->state
);
1288 dev
->flags
|= IFF_UP
;
1289 net_dmaengine_get();
1290 dev_set_rx_mode(dev
);
1292 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1299 * dev_open - prepare an interface for use.
1300 * @dev: device to open
1302 * Takes a device from down to up state. The device's private open
1303 * function is invoked and then the multicast lists are loaded. Finally
1304 * the device is moved into the up state and a %NETDEV_UP message is
1305 * sent to the netdev notifier chain.
1307 * Calling this function on an active interface is a nop. On a failure
1308 * a negative errno code is returned.
1310 int dev_open(struct net_device
*dev
)
1314 if (dev
->flags
& IFF_UP
)
1317 ret
= __dev_open(dev
);
1321 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1322 call_netdevice_notifiers(NETDEV_UP
, dev
);
1326 EXPORT_SYMBOL(dev_open
);
1328 static int __dev_close_many(struct list_head
*head
)
1330 struct net_device
*dev
;
1335 list_for_each_entry(dev
, head
, close_list
) {
1336 /* Temporarily disable netpoll until the interface is down */
1337 netpoll_poll_disable(dev
);
1339 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1341 clear_bit(__LINK_STATE_START
, &dev
->state
);
1343 /* Synchronize to scheduled poll. We cannot touch poll list, it
1344 * can be even on different cpu. So just clear netif_running().
1346 * dev->stop() will invoke napi_disable() on all of it's
1347 * napi_struct instances on this device.
1349 smp_mb__after_atomic(); /* Commit netif_running(). */
1352 dev_deactivate_many(head
);
1354 list_for_each_entry(dev
, head
, close_list
) {
1355 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1358 * Call the device specific close. This cannot fail.
1359 * Only if device is UP
1361 * We allow it to be called even after a DETACH hot-plug
1367 dev
->flags
&= ~IFF_UP
;
1368 net_dmaengine_put();
1369 netpoll_poll_enable(dev
);
1375 static int __dev_close(struct net_device
*dev
)
1380 list_add(&dev
->close_list
, &single
);
1381 retval
= __dev_close_many(&single
);
1387 static int dev_close_many(struct list_head
*head
)
1389 struct net_device
*dev
, *tmp
;
1391 /* Remove the devices that don't need to be closed */
1392 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1393 if (!(dev
->flags
& IFF_UP
))
1394 list_del_init(&dev
->close_list
);
1396 __dev_close_many(head
);
1398 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1399 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1400 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1401 list_del_init(&dev
->close_list
);
1408 * dev_close - shutdown an interface.
1409 * @dev: device to shutdown
1411 * This function moves an active device into down state. A
1412 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1413 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1416 int dev_close(struct net_device
*dev
)
1418 if (dev
->flags
& IFF_UP
) {
1421 list_add(&dev
->close_list
, &single
);
1422 dev_close_many(&single
);
1427 EXPORT_SYMBOL(dev_close
);
1431 * dev_disable_lro - disable Large Receive Offload on a device
1434 * Disable Large Receive Offload (LRO) on a net device. Must be
1435 * called under RTNL. This is needed if received packets may be
1436 * forwarded to another interface.
1438 void dev_disable_lro(struct net_device
*dev
)
1441 * If we're trying to disable lro on a vlan device
1442 * use the underlying physical device instead
1444 if (is_vlan_dev(dev
))
1445 dev
= vlan_dev_real_dev(dev
);
1447 /* the same for macvlan devices */
1448 if (netif_is_macvlan(dev
))
1449 dev
= macvlan_dev_real_dev(dev
);
1451 dev
->wanted_features
&= ~NETIF_F_LRO
;
1452 netdev_update_features(dev
);
1454 if (unlikely(dev
->features
& NETIF_F_LRO
))
1455 netdev_WARN(dev
, "failed to disable LRO!\n");
1457 EXPORT_SYMBOL(dev_disable_lro
);
1459 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1460 struct net_device
*dev
)
1462 struct netdev_notifier_info info
;
1464 netdev_notifier_info_init(&info
, dev
);
1465 return nb
->notifier_call(nb
, val
, &info
);
1468 static int dev_boot_phase
= 1;
1471 * register_netdevice_notifier - register a network notifier block
1474 * Register a notifier to be called when network device events occur.
1475 * The notifier passed is linked into the kernel structures and must
1476 * not be reused until it has been unregistered. A negative errno code
1477 * is returned on a failure.
1479 * When registered all registration and up events are replayed
1480 * to the new notifier to allow device to have a race free
1481 * view of the network device list.
1484 int register_netdevice_notifier(struct notifier_block
*nb
)
1486 struct net_device
*dev
;
1487 struct net_device
*last
;
1492 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1498 for_each_netdev(net
, dev
) {
1499 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1500 err
= notifier_to_errno(err
);
1504 if (!(dev
->flags
& IFF_UP
))
1507 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1518 for_each_netdev(net
, dev
) {
1522 if (dev
->flags
& IFF_UP
) {
1523 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1525 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1527 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1532 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1535 EXPORT_SYMBOL(register_netdevice_notifier
);
1538 * unregister_netdevice_notifier - unregister a network notifier block
1541 * Unregister a notifier previously registered by
1542 * register_netdevice_notifier(). The notifier is unlinked into the
1543 * kernel structures and may then be reused. A negative errno code
1544 * is returned on a failure.
1546 * After unregistering unregister and down device events are synthesized
1547 * for all devices on the device list to the removed notifier to remove
1548 * the need for special case cleanup code.
1551 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1553 struct net_device
*dev
;
1558 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1563 for_each_netdev(net
, dev
) {
1564 if (dev
->flags
& IFF_UP
) {
1565 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1567 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1569 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1576 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1579 * call_netdevice_notifiers_info - call all network notifier blocks
1580 * @val: value passed unmodified to notifier function
1581 * @dev: net_device pointer passed unmodified to notifier function
1582 * @info: notifier information data
1584 * Call all network notifier blocks. Parameters and return value
1585 * are as for raw_notifier_call_chain().
1588 static int call_netdevice_notifiers_info(unsigned long val
,
1589 struct net_device
*dev
,
1590 struct netdev_notifier_info
*info
)
1593 netdev_notifier_info_init(info
, dev
);
1594 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1598 * call_netdevice_notifiers - call all network notifier blocks
1599 * @val: value passed unmodified to notifier function
1600 * @dev: net_device pointer passed unmodified to notifier function
1602 * Call all network notifier blocks. Parameters and return value
1603 * are as for raw_notifier_call_chain().
1606 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1608 struct netdev_notifier_info info
;
1610 return call_netdevice_notifiers_info(val
, dev
, &info
);
1612 EXPORT_SYMBOL(call_netdevice_notifiers
);
1614 static struct static_key netstamp_needed __read_mostly
;
1615 #ifdef HAVE_JUMP_LABEL
1616 /* We are not allowed to call static_key_slow_dec() from irq context
1617 * If net_disable_timestamp() is called from irq context, defer the
1618 * static_key_slow_dec() calls.
1620 static atomic_t netstamp_needed_deferred
;
1623 void net_enable_timestamp(void)
1625 #ifdef HAVE_JUMP_LABEL
1626 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1630 static_key_slow_dec(&netstamp_needed
);
1634 static_key_slow_inc(&netstamp_needed
);
1636 EXPORT_SYMBOL(net_enable_timestamp
);
1638 void net_disable_timestamp(void)
1640 #ifdef HAVE_JUMP_LABEL
1641 if (in_interrupt()) {
1642 atomic_inc(&netstamp_needed_deferred
);
1646 static_key_slow_dec(&netstamp_needed
);
1648 EXPORT_SYMBOL(net_disable_timestamp
);
1650 static inline void net_timestamp_set(struct sk_buff
*skb
)
1652 skb
->tstamp
.tv64
= 0;
1653 if (static_key_false(&netstamp_needed
))
1654 __net_timestamp(skb
);
1657 #define net_timestamp_check(COND, SKB) \
1658 if (static_key_false(&netstamp_needed)) { \
1659 if ((COND) && !(SKB)->tstamp.tv64) \
1660 __net_timestamp(SKB); \
1663 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1667 if (!(dev
->flags
& IFF_UP
))
1670 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1671 if (skb
->len
<= len
)
1674 /* if TSO is enabled, we don't care about the length as the packet
1675 * could be forwarded without being segmented before
1677 if (skb_is_gso(skb
))
1682 EXPORT_SYMBOL_GPL(is_skb_forwardable
);
1684 int __dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1686 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1687 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1688 atomic_long_inc(&dev
->rx_dropped
);
1694 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1695 atomic_long_inc(&dev
->rx_dropped
);
1700 skb_scrub_packet(skb
, true);
1701 skb
->protocol
= eth_type_trans(skb
, dev
);
1705 EXPORT_SYMBOL_GPL(__dev_forward_skb
);
1708 * dev_forward_skb - loopback an skb to another netif
1710 * @dev: destination network device
1711 * @skb: buffer to forward
1714 * NET_RX_SUCCESS (no congestion)
1715 * NET_RX_DROP (packet was dropped, but freed)
1717 * dev_forward_skb can be used for injecting an skb from the
1718 * start_xmit function of one device into the receive queue
1719 * of another device.
1721 * The receiving device may be in another namespace, so
1722 * we have to clear all information in the skb that could
1723 * impact namespace isolation.
1725 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1727 return __dev_forward_skb(dev
, skb
) ?: netif_rx_internal(skb
);
1729 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1731 static inline int deliver_skb(struct sk_buff
*skb
,
1732 struct packet_type
*pt_prev
,
1733 struct net_device
*orig_dev
)
1735 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1737 atomic_inc(&skb
->users
);
1738 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1741 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1743 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1746 if (ptype
->id_match
)
1747 return ptype
->id_match(ptype
, skb
->sk
);
1748 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1755 * Support routine. Sends outgoing frames to any network
1756 * taps currently in use.
1759 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1761 struct packet_type
*ptype
;
1762 struct sk_buff
*skb2
= NULL
;
1763 struct packet_type
*pt_prev
= NULL
;
1766 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1767 /* Never send packets back to the socket
1768 * they originated from - MvS (miquels@drinkel.ow.org)
1770 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1771 (!skb_loop_sk(ptype
, skb
))) {
1773 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1778 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1782 net_timestamp_set(skb2
);
1784 /* skb->nh should be correctly
1785 set by sender, so that the second statement is
1786 just protection against buggy protocols.
1788 skb_reset_mac_header(skb2
);
1790 if (skb_network_header(skb2
) < skb2
->data
||
1791 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1792 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1793 ntohs(skb2
->protocol
),
1795 skb_reset_network_header(skb2
);
1798 skb2
->transport_header
= skb2
->network_header
;
1799 skb2
->pkt_type
= PACKET_OUTGOING
;
1804 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1809 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1810 * @dev: Network device
1811 * @txq: number of queues available
1813 * If real_num_tx_queues is changed the tc mappings may no longer be
1814 * valid. To resolve this verify the tc mapping remains valid and if
1815 * not NULL the mapping. With no priorities mapping to this
1816 * offset/count pair it will no longer be used. In the worst case TC0
1817 * is invalid nothing can be done so disable priority mappings. If is
1818 * expected that drivers will fix this mapping if they can before
1819 * calling netif_set_real_num_tx_queues.
1821 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1824 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1826 /* If TC0 is invalidated disable TC mapping */
1827 if (tc
->offset
+ tc
->count
> txq
) {
1828 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1833 /* Invalidated prio to tc mappings set to TC0 */
1834 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1835 int q
= netdev_get_prio_tc_map(dev
, i
);
1837 tc
= &dev
->tc_to_txq
[q
];
1838 if (tc
->offset
+ tc
->count
> txq
) {
1839 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1841 netdev_set_prio_tc_map(dev
, i
, 0);
1847 static DEFINE_MUTEX(xps_map_mutex
);
1848 #define xmap_dereference(P) \
1849 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1851 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1854 struct xps_map
*map
= NULL
;
1858 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1860 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1861 if (map
->queues
[pos
] == index
) {
1863 map
->queues
[pos
] = map
->queues
[--map
->len
];
1865 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1866 kfree_rcu(map
, rcu
);
1876 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1878 struct xps_dev_maps
*dev_maps
;
1880 bool active
= false;
1882 mutex_lock(&xps_map_mutex
);
1883 dev_maps
= xmap_dereference(dev
->xps_maps
);
1888 for_each_possible_cpu(cpu
) {
1889 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1890 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1893 if (i
== dev
->num_tx_queues
)
1898 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1899 kfree_rcu(dev_maps
, rcu
);
1902 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1903 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1907 mutex_unlock(&xps_map_mutex
);
1910 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1913 struct xps_map
*new_map
;
1914 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1917 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1918 if (map
->queues
[pos
] != index
)
1923 /* Need to add queue to this CPU's existing map */
1925 if (pos
< map
->alloc_len
)
1928 alloc_len
= map
->alloc_len
* 2;
1931 /* Need to allocate new map to store queue on this CPU's map */
1932 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1937 for (i
= 0; i
< pos
; i
++)
1938 new_map
->queues
[i
] = map
->queues
[i
];
1939 new_map
->alloc_len
= alloc_len
;
1945 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
1948 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
1949 struct xps_map
*map
, *new_map
;
1950 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
1951 int cpu
, numa_node_id
= -2;
1952 bool active
= false;
1954 mutex_lock(&xps_map_mutex
);
1956 dev_maps
= xmap_dereference(dev
->xps_maps
);
1958 /* allocate memory for queue storage */
1959 for_each_online_cpu(cpu
) {
1960 if (!cpumask_test_cpu(cpu
, mask
))
1964 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
1965 if (!new_dev_maps
) {
1966 mutex_unlock(&xps_map_mutex
);
1970 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1973 map
= expand_xps_map(map
, cpu
, index
);
1977 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1981 goto out_no_new_maps
;
1983 for_each_possible_cpu(cpu
) {
1984 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
1985 /* add queue to CPU maps */
1988 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1989 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
1992 if (pos
== map
->len
)
1993 map
->queues
[map
->len
++] = index
;
1995 if (numa_node_id
== -2)
1996 numa_node_id
= cpu_to_node(cpu
);
1997 else if (numa_node_id
!= cpu_to_node(cpu
))
2000 } else if (dev_maps
) {
2001 /* fill in the new device map from the old device map */
2002 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2003 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2008 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
2010 /* Cleanup old maps */
2012 for_each_possible_cpu(cpu
) {
2013 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2014 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2015 if (map
&& map
!= new_map
)
2016 kfree_rcu(map
, rcu
);
2019 kfree_rcu(dev_maps
, rcu
);
2022 dev_maps
= new_dev_maps
;
2026 /* update Tx queue numa node */
2027 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2028 (numa_node_id
>= 0) ? numa_node_id
:
2034 /* removes queue from unused CPUs */
2035 for_each_possible_cpu(cpu
) {
2036 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2039 if (remove_xps_queue(dev_maps
, cpu
, index
))
2043 /* free map if not active */
2045 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2046 kfree_rcu(dev_maps
, rcu
);
2050 mutex_unlock(&xps_map_mutex
);
2054 /* remove any maps that we added */
2055 for_each_possible_cpu(cpu
) {
2056 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2057 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2059 if (new_map
&& new_map
!= map
)
2063 mutex_unlock(&xps_map_mutex
);
2065 kfree(new_dev_maps
);
2068 EXPORT_SYMBOL(netif_set_xps_queue
);
2072 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2073 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2075 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2079 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2082 if (dev
->reg_state
== NETREG_REGISTERED
||
2083 dev
->reg_state
== NETREG_UNREGISTERING
) {
2086 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2092 netif_setup_tc(dev
, txq
);
2094 if (txq
< dev
->real_num_tx_queues
) {
2095 qdisc_reset_all_tx_gt(dev
, txq
);
2097 netif_reset_xps_queues_gt(dev
, txq
);
2102 dev
->real_num_tx_queues
= txq
;
2105 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2109 * netif_set_real_num_rx_queues - set actual number of RX queues used
2110 * @dev: Network device
2111 * @rxq: Actual number of RX queues
2113 * This must be called either with the rtnl_lock held or before
2114 * registration of the net device. Returns 0 on success, or a
2115 * negative error code. If called before registration, it always
2118 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2122 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2125 if (dev
->reg_state
== NETREG_REGISTERED
) {
2128 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2134 dev
->real_num_rx_queues
= rxq
;
2137 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2141 * netif_get_num_default_rss_queues - default number of RSS queues
2143 * This routine should set an upper limit on the number of RSS queues
2144 * used by default by multiqueue devices.
2146 int netif_get_num_default_rss_queues(void)
2148 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2150 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2152 static inline void __netif_reschedule(struct Qdisc
*q
)
2154 struct softnet_data
*sd
;
2155 unsigned long flags
;
2157 local_irq_save(flags
);
2158 sd
= &__get_cpu_var(softnet_data
);
2159 q
->next_sched
= NULL
;
2160 *sd
->output_queue_tailp
= q
;
2161 sd
->output_queue_tailp
= &q
->next_sched
;
2162 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2163 local_irq_restore(flags
);
2166 void __netif_schedule(struct Qdisc
*q
)
2168 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2169 __netif_reschedule(q
);
2171 EXPORT_SYMBOL(__netif_schedule
);
2173 struct dev_kfree_skb_cb
{
2174 enum skb_free_reason reason
;
2177 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2179 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2182 void netif_schedule_queue(struct netdev_queue
*txq
)
2185 if (!(txq
->state
& QUEUE_STATE_ANY_XOFF
)) {
2186 struct Qdisc
*q
= rcu_dereference(txq
->qdisc
);
2188 __netif_schedule(q
);
2192 EXPORT_SYMBOL(netif_schedule_queue
);
2195 * netif_wake_subqueue - allow sending packets on subqueue
2196 * @dev: network device
2197 * @queue_index: sub queue index
2199 * Resume individual transmit queue of a device with multiple transmit queues.
2201 void netif_wake_subqueue(struct net_device
*dev
, u16 queue_index
)
2203 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
2205 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &txq
->state
)) {
2209 q
= rcu_dereference(txq
->qdisc
);
2210 __netif_schedule(q
);
2214 EXPORT_SYMBOL(netif_wake_subqueue
);
2216 void netif_tx_wake_queue(struct netdev_queue
*dev_queue
)
2218 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &dev_queue
->state
)) {
2222 q
= rcu_dereference(dev_queue
->qdisc
);
2223 __netif_schedule(q
);
2227 EXPORT_SYMBOL(netif_tx_wake_queue
);
2229 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2231 unsigned long flags
;
2233 if (likely(atomic_read(&skb
->users
) == 1)) {
2235 atomic_set(&skb
->users
, 0);
2236 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2239 get_kfree_skb_cb(skb
)->reason
= reason
;
2240 local_irq_save(flags
);
2241 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2242 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2243 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2244 local_irq_restore(flags
);
2246 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2248 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2250 if (in_irq() || irqs_disabled())
2251 __dev_kfree_skb_irq(skb
, reason
);
2255 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2259 * netif_device_detach - mark device as removed
2260 * @dev: network device
2262 * Mark device as removed from system and therefore no longer available.
2264 void netif_device_detach(struct net_device
*dev
)
2266 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2267 netif_running(dev
)) {
2268 netif_tx_stop_all_queues(dev
);
2271 EXPORT_SYMBOL(netif_device_detach
);
2274 * netif_device_attach - mark device as attached
2275 * @dev: network device
2277 * Mark device as attached from system and restart if needed.
2279 void netif_device_attach(struct net_device
*dev
)
2281 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2282 netif_running(dev
)) {
2283 netif_tx_wake_all_queues(dev
);
2284 __netdev_watchdog_up(dev
);
2287 EXPORT_SYMBOL(netif_device_attach
);
2289 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2291 static const netdev_features_t null_features
= 0;
2292 struct net_device
*dev
= skb
->dev
;
2293 const char *driver
= "";
2295 if (!net_ratelimit())
2298 if (dev
&& dev
->dev
.parent
)
2299 driver
= dev_driver_string(dev
->dev
.parent
);
2301 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2302 "gso_type=%d ip_summed=%d\n",
2303 driver
, dev
? &dev
->features
: &null_features
,
2304 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2305 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2306 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2310 * Invalidate hardware checksum when packet is to be mangled, and
2311 * complete checksum manually on outgoing path.
2313 int skb_checksum_help(struct sk_buff
*skb
)
2316 int ret
= 0, offset
;
2318 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2319 goto out_set_summed
;
2321 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2322 skb_warn_bad_offload(skb
);
2326 /* Before computing a checksum, we should make sure no frag could
2327 * be modified by an external entity : checksum could be wrong.
2329 if (skb_has_shared_frag(skb
)) {
2330 ret
= __skb_linearize(skb
);
2335 offset
= skb_checksum_start_offset(skb
);
2336 BUG_ON(offset
>= skb_headlen(skb
));
2337 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2339 offset
+= skb
->csum_offset
;
2340 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2342 if (skb_cloned(skb
) &&
2343 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2344 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2349 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2351 skb
->ip_summed
= CHECKSUM_NONE
;
2355 EXPORT_SYMBOL(skb_checksum_help
);
2357 __be16
skb_network_protocol(struct sk_buff
*skb
, int *depth
)
2359 unsigned int vlan_depth
= skb
->mac_len
;
2360 __be16 type
= skb
->protocol
;
2362 /* Tunnel gso handlers can set protocol to ethernet. */
2363 if (type
== htons(ETH_P_TEB
)) {
2366 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2369 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2370 type
= eth
->h_proto
;
2373 /* if skb->protocol is 802.1Q/AD then the header should already be
2374 * present at mac_len - VLAN_HLEN (if mac_len > 0), or at
2375 * ETH_HLEN otherwise
2377 if (type
== htons(ETH_P_8021Q
) || type
== htons(ETH_P_8021AD
)) {
2379 if (WARN_ON(vlan_depth
< VLAN_HLEN
))
2381 vlan_depth
-= VLAN_HLEN
;
2383 vlan_depth
= ETH_HLEN
;
2386 struct vlan_hdr
*vh
;
2388 if (unlikely(!pskb_may_pull(skb
,
2389 vlan_depth
+ VLAN_HLEN
)))
2392 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
2393 type
= vh
->h_vlan_encapsulated_proto
;
2394 vlan_depth
+= VLAN_HLEN
;
2395 } while (type
== htons(ETH_P_8021Q
) ||
2396 type
== htons(ETH_P_8021AD
));
2399 *depth
= vlan_depth
;
2405 * skb_mac_gso_segment - mac layer segmentation handler.
2406 * @skb: buffer to segment
2407 * @features: features for the output path (see dev->features)
2409 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2410 netdev_features_t features
)
2412 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2413 struct packet_offload
*ptype
;
2414 int vlan_depth
= skb
->mac_len
;
2415 __be16 type
= skb_network_protocol(skb
, &vlan_depth
);
2417 if (unlikely(!type
))
2418 return ERR_PTR(-EINVAL
);
2420 __skb_pull(skb
, vlan_depth
);
2423 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2424 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2425 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2428 err
= ptype
->callbacks
.gso_send_check(skb
);
2429 segs
= ERR_PTR(err
);
2430 if (err
|| skb_gso_ok(skb
, features
))
2432 __skb_push(skb
, (skb
->data
-
2433 skb_network_header(skb
)));
2435 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2441 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2445 EXPORT_SYMBOL(skb_mac_gso_segment
);
2448 /* openvswitch calls this on rx path, so we need a different check.
2450 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2453 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2455 return skb
->ip_summed
== CHECKSUM_NONE
;
2459 * __skb_gso_segment - Perform segmentation on skb.
2460 * @skb: buffer to segment
2461 * @features: features for the output path (see dev->features)
2462 * @tx_path: whether it is called in TX path
2464 * This function segments the given skb and returns a list of segments.
2466 * It may return NULL if the skb requires no segmentation. This is
2467 * only possible when GSO is used for verifying header integrity.
2469 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2470 netdev_features_t features
, bool tx_path
)
2472 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2475 skb_warn_bad_offload(skb
);
2477 err
= skb_cow_head(skb
, 0);
2479 return ERR_PTR(err
);
2482 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2483 SKB_GSO_CB(skb
)->encap_level
= 0;
2485 skb_reset_mac_header(skb
);
2486 skb_reset_mac_len(skb
);
2488 return skb_mac_gso_segment(skb
, features
);
2490 EXPORT_SYMBOL(__skb_gso_segment
);
2492 /* Take action when hardware reception checksum errors are detected. */
2494 void netdev_rx_csum_fault(struct net_device
*dev
)
2496 if (net_ratelimit()) {
2497 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2501 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2504 /* Actually, we should eliminate this check as soon as we know, that:
2505 * 1. IOMMU is present and allows to map all the memory.
2506 * 2. No high memory really exists on this machine.
2509 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2511 #ifdef CONFIG_HIGHMEM
2513 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2514 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2515 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2516 if (PageHighMem(skb_frag_page(frag
)))
2521 if (PCI_DMA_BUS_IS_PHYS
) {
2522 struct device
*pdev
= dev
->dev
.parent
;
2526 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2527 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2528 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2529 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2537 /* If MPLS offload request, verify we are testing hardware MPLS features
2538 * instead of standard features for the netdev.
2540 #ifdef CONFIG_NET_MPLS_GSO
2541 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2542 netdev_features_t features
,
2545 if (type
== htons(ETH_P_MPLS_UC
) || type
== htons(ETH_P_MPLS_MC
))
2546 features
&= skb
->dev
->mpls_features
;
2551 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2552 netdev_features_t features
,
2559 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2560 netdev_features_t features
)
2565 type
= skb_network_protocol(skb
, &tmp
);
2566 features
= net_mpls_features(skb
, features
, type
);
2568 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2569 !can_checksum_protocol(features
, type
)) {
2570 features
&= ~NETIF_F_ALL_CSUM
;
2571 } else if (illegal_highdma(skb
->dev
, skb
)) {
2572 features
&= ~NETIF_F_SG
;
2578 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2580 __be16 protocol
= skb
->protocol
;
2581 netdev_features_t features
= skb
->dev
->features
;
2583 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2584 features
&= ~NETIF_F_GSO_MASK
;
2586 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
)) {
2587 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2588 protocol
= veh
->h_vlan_encapsulated_proto
;
2589 } else if (!vlan_tx_tag_present(skb
)) {
2590 return harmonize_features(skb
, features
);
2593 features
= netdev_intersect_features(features
,
2594 skb
->dev
->vlan_features
|
2595 NETIF_F_HW_VLAN_CTAG_TX
|
2596 NETIF_F_HW_VLAN_STAG_TX
);
2598 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
))
2599 features
= netdev_intersect_features(features
,
2604 NETIF_F_HW_VLAN_CTAG_TX
|
2605 NETIF_F_HW_VLAN_STAG_TX
);
2607 return harmonize_features(skb
, features
);
2609 EXPORT_SYMBOL(netif_skb_features
);
2611 static int xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
2612 struct netdev_queue
*txq
, bool more
)
2617 if (!list_empty(&ptype_all
))
2618 dev_queue_xmit_nit(skb
, dev
);
2621 trace_net_dev_start_xmit(skb
, dev
);
2622 rc
= netdev_start_xmit(skb
, dev
, txq
, more
);
2623 trace_net_dev_xmit(skb
, rc
, dev
, len
);
2628 struct sk_buff
*dev_hard_start_xmit(struct sk_buff
*first
, struct net_device
*dev
,
2629 struct netdev_queue
*txq
, int *ret
)
2631 struct sk_buff
*skb
= first
;
2632 int rc
= NETDEV_TX_OK
;
2635 struct sk_buff
*next
= skb
->next
;
2638 rc
= xmit_one(skb
, dev
, txq
, next
!= NULL
);
2639 if (unlikely(!dev_xmit_complete(rc
))) {
2645 if (netif_xmit_stopped(txq
) && skb
) {
2646 rc
= NETDEV_TX_BUSY
;
2656 struct sk_buff
*validate_xmit_vlan(struct sk_buff
*skb
, netdev_features_t features
)
2658 if (vlan_tx_tag_present(skb
) &&
2659 !vlan_hw_offload_capable(features
, skb
->vlan_proto
)) {
2660 skb
= __vlan_put_tag(skb
, skb
->vlan_proto
,
2661 vlan_tx_tag_get(skb
));
2668 struct sk_buff
*validate_xmit_skb(struct sk_buff
*skb
, struct net_device
*dev
)
2670 netdev_features_t features
;
2675 /* If device doesn't need skb->dst, release it right now while
2676 * its hot in this cpu cache
2678 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2681 features
= netif_skb_features(skb
);
2682 skb
= validate_xmit_vlan(skb
, features
);
2686 /* If encapsulation offload request, verify we are testing
2687 * hardware encapsulation features instead of standard
2688 * features for the netdev
2690 if (skb
->encapsulation
)
2691 features
&= dev
->hw_enc_features
;
2693 if (netif_needs_gso(skb
, features
)) {
2694 struct sk_buff
*segs
;
2696 segs
= skb_gso_segment(skb
, features
);
2702 if (skb_needs_linearize(skb
, features
) &&
2703 __skb_linearize(skb
))
2706 /* If packet is not checksummed and device does not
2707 * support checksumming for this protocol, complete
2708 * checksumming here.
2710 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2711 if (skb
->encapsulation
)
2712 skb_set_inner_transport_header(skb
,
2713 skb_checksum_start_offset(skb
));
2715 skb_set_transport_header(skb
,
2716 skb_checksum_start_offset(skb
));
2717 if (!(features
& NETIF_F_ALL_CSUM
) &&
2718 skb_checksum_help(skb
))
2731 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2733 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2735 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2737 /* To get more precise estimation of bytes sent on wire,
2738 * we add to pkt_len the headers size of all segments
2740 if (shinfo
->gso_size
) {
2741 unsigned int hdr_len
;
2742 u16 gso_segs
= shinfo
->gso_segs
;
2744 /* mac layer + network layer */
2745 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2747 /* + transport layer */
2748 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2749 hdr_len
+= tcp_hdrlen(skb
);
2751 hdr_len
+= sizeof(struct udphdr
);
2753 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2754 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2757 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2761 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2762 struct net_device
*dev
,
2763 struct netdev_queue
*txq
)
2765 spinlock_t
*root_lock
= qdisc_lock(q
);
2769 qdisc_pkt_len_init(skb
);
2770 qdisc_calculate_pkt_len(skb
, q
);
2772 * Heuristic to force contended enqueues to serialize on a
2773 * separate lock before trying to get qdisc main lock.
2774 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2775 * often and dequeue packets faster.
2777 contended
= qdisc_is_running(q
);
2778 if (unlikely(contended
))
2779 spin_lock(&q
->busylock
);
2781 spin_lock(root_lock
);
2782 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2785 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2786 qdisc_run_begin(q
)) {
2788 * This is a work-conserving queue; there are no old skbs
2789 * waiting to be sent out; and the qdisc is not running -
2790 * xmit the skb directly.
2792 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2795 qdisc_bstats_update(q
, skb
);
2797 skb
= validate_xmit_skb(skb
, dev
);
2798 if (skb
&& sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2799 if (unlikely(contended
)) {
2800 spin_unlock(&q
->busylock
);
2807 rc
= NET_XMIT_SUCCESS
;
2810 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2811 if (qdisc_run_begin(q
)) {
2812 if (unlikely(contended
)) {
2813 spin_unlock(&q
->busylock
);
2819 spin_unlock(root_lock
);
2820 if (unlikely(contended
))
2821 spin_unlock(&q
->busylock
);
2825 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2826 static void skb_update_prio(struct sk_buff
*skb
)
2828 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2830 if (!skb
->priority
&& skb
->sk
&& map
) {
2831 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2833 if (prioidx
< map
->priomap_len
)
2834 skb
->priority
= map
->priomap
[prioidx
];
2838 #define skb_update_prio(skb)
2841 static DEFINE_PER_CPU(int, xmit_recursion
);
2842 #define RECURSION_LIMIT 10
2845 * dev_loopback_xmit - loop back @skb
2846 * @skb: buffer to transmit
2848 int dev_loopback_xmit(struct sk_buff
*skb
)
2850 skb_reset_mac_header(skb
);
2851 __skb_pull(skb
, skb_network_offset(skb
));
2852 skb
->pkt_type
= PACKET_LOOPBACK
;
2853 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2854 WARN_ON(!skb_dst(skb
));
2859 EXPORT_SYMBOL(dev_loopback_xmit
);
2862 * __dev_queue_xmit - transmit a buffer
2863 * @skb: buffer to transmit
2864 * @accel_priv: private data used for L2 forwarding offload
2866 * Queue a buffer for transmission to a network device. The caller must
2867 * have set the device and priority and built the buffer before calling
2868 * this function. The function can be called from an interrupt.
2870 * A negative errno code is returned on a failure. A success does not
2871 * guarantee the frame will be transmitted as it may be dropped due
2872 * to congestion or traffic shaping.
2874 * -----------------------------------------------------------------------------------
2875 * I notice this method can also return errors from the queue disciplines,
2876 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2879 * Regardless of the return value, the skb is consumed, so it is currently
2880 * difficult to retry a send to this method. (You can bump the ref count
2881 * before sending to hold a reference for retry if you are careful.)
2883 * When calling this method, interrupts MUST be enabled. This is because
2884 * the BH enable code must have IRQs enabled so that it will not deadlock.
2887 static int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
2889 struct net_device
*dev
= skb
->dev
;
2890 struct netdev_queue
*txq
;
2894 skb_reset_mac_header(skb
);
2896 if (unlikely(skb_shinfo(skb
)->tx_flags
& SKBTX_SCHED_TSTAMP
))
2897 __skb_tstamp_tx(skb
, NULL
, skb
->sk
, SCM_TSTAMP_SCHED
);
2899 /* Disable soft irqs for various locks below. Also
2900 * stops preemption for RCU.
2904 skb_update_prio(skb
);
2906 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
2907 q
= rcu_dereference_bh(txq
->qdisc
);
2909 #ifdef CONFIG_NET_CLS_ACT
2910 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2912 trace_net_dev_queue(skb
);
2914 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2918 /* The device has no queue. Common case for software devices:
2919 loopback, all the sorts of tunnels...
2921 Really, it is unlikely that netif_tx_lock protection is necessary
2922 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2924 However, it is possible, that they rely on protection
2927 Check this and shot the lock. It is not prone from deadlocks.
2928 Either shot noqueue qdisc, it is even simpler 8)
2930 if (dev
->flags
& IFF_UP
) {
2931 int cpu
= smp_processor_id(); /* ok because BHs are off */
2933 if (txq
->xmit_lock_owner
!= cpu
) {
2935 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2936 goto recursion_alert
;
2938 skb
= validate_xmit_skb(skb
, dev
);
2942 HARD_TX_LOCK(dev
, txq
, cpu
);
2944 if (!netif_xmit_stopped(txq
)) {
2945 __this_cpu_inc(xmit_recursion
);
2946 skb
= dev_hard_start_xmit(skb
, dev
, txq
, &rc
);
2947 __this_cpu_dec(xmit_recursion
);
2948 if (dev_xmit_complete(rc
)) {
2949 HARD_TX_UNLOCK(dev
, txq
);
2953 HARD_TX_UNLOCK(dev
, txq
);
2954 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2957 /* Recursion is detected! It is possible,
2961 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2968 rcu_read_unlock_bh();
2970 atomic_long_inc(&dev
->tx_dropped
);
2971 kfree_skb_list(skb
);
2974 rcu_read_unlock_bh();
2978 int dev_queue_xmit(struct sk_buff
*skb
)
2980 return __dev_queue_xmit(skb
, NULL
);
2982 EXPORT_SYMBOL(dev_queue_xmit
);
2984 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
2986 return __dev_queue_xmit(skb
, accel_priv
);
2988 EXPORT_SYMBOL(dev_queue_xmit_accel
);
2991 /*=======================================================================
2993 =======================================================================*/
2995 int netdev_max_backlog __read_mostly
= 1000;
2996 EXPORT_SYMBOL(netdev_max_backlog
);
2998 int netdev_tstamp_prequeue __read_mostly
= 1;
2999 int netdev_budget __read_mostly
= 300;
3000 int weight_p __read_mostly
= 64; /* old backlog weight */
3002 /* Called with irq disabled */
3003 static inline void ____napi_schedule(struct softnet_data
*sd
,
3004 struct napi_struct
*napi
)
3006 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
3007 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3012 /* One global table that all flow-based protocols share. */
3013 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
3014 EXPORT_SYMBOL(rps_sock_flow_table
);
3016 struct static_key rps_needed __read_mostly
;
3018 static struct rps_dev_flow
*
3019 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3020 struct rps_dev_flow
*rflow
, u16 next_cpu
)
3022 if (next_cpu
!= RPS_NO_CPU
) {
3023 #ifdef CONFIG_RFS_ACCEL
3024 struct netdev_rx_queue
*rxqueue
;
3025 struct rps_dev_flow_table
*flow_table
;
3026 struct rps_dev_flow
*old_rflow
;
3031 /* Should we steer this flow to a different hardware queue? */
3032 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
3033 !(dev
->features
& NETIF_F_NTUPLE
))
3035 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
3036 if (rxq_index
== skb_get_rx_queue(skb
))
3039 rxqueue
= dev
->_rx
+ rxq_index
;
3040 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3043 flow_id
= skb_get_hash(skb
) & flow_table
->mask
;
3044 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
3045 rxq_index
, flow_id
);
3049 rflow
= &flow_table
->flows
[flow_id
];
3051 if (old_rflow
->filter
== rflow
->filter
)
3052 old_rflow
->filter
= RPS_NO_FILTER
;
3056 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
3059 rflow
->cpu
= next_cpu
;
3064 * get_rps_cpu is called from netif_receive_skb and returns the target
3065 * CPU from the RPS map of the receiving queue for a given skb.
3066 * rcu_read_lock must be held on entry.
3068 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3069 struct rps_dev_flow
**rflowp
)
3071 struct netdev_rx_queue
*rxqueue
;
3072 struct rps_map
*map
;
3073 struct rps_dev_flow_table
*flow_table
;
3074 struct rps_sock_flow_table
*sock_flow_table
;
3079 if (skb_rx_queue_recorded(skb
)) {
3080 u16 index
= skb_get_rx_queue(skb
);
3081 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
3082 WARN_ONCE(dev
->real_num_rx_queues
> 1,
3083 "%s received packet on queue %u, but number "
3084 "of RX queues is %u\n",
3085 dev
->name
, index
, dev
->real_num_rx_queues
);
3088 rxqueue
= dev
->_rx
+ index
;
3092 map
= rcu_dereference(rxqueue
->rps_map
);
3094 if (map
->len
== 1 &&
3095 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
3096 tcpu
= map
->cpus
[0];
3097 if (cpu_online(tcpu
))
3101 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
3105 skb_reset_network_header(skb
);
3106 hash
= skb_get_hash(skb
);
3110 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3111 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3112 if (flow_table
&& sock_flow_table
) {
3114 struct rps_dev_flow
*rflow
;
3116 rflow
= &flow_table
->flows
[hash
& flow_table
->mask
];
3119 next_cpu
= sock_flow_table
->ents
[hash
& sock_flow_table
->mask
];
3122 * If the desired CPU (where last recvmsg was done) is
3123 * different from current CPU (one in the rx-queue flow
3124 * table entry), switch if one of the following holds:
3125 * - Current CPU is unset (equal to RPS_NO_CPU).
3126 * - Current CPU is offline.
3127 * - The current CPU's queue tail has advanced beyond the
3128 * last packet that was enqueued using this table entry.
3129 * This guarantees that all previous packets for the flow
3130 * have been dequeued, thus preserving in order delivery.
3132 if (unlikely(tcpu
!= next_cpu
) &&
3133 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
3134 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3135 rflow
->last_qtail
)) >= 0)) {
3137 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3140 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
3148 tcpu
= map
->cpus
[reciprocal_scale(hash
, map
->len
)];
3149 if (cpu_online(tcpu
)) {
3159 #ifdef CONFIG_RFS_ACCEL
3162 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3163 * @dev: Device on which the filter was set
3164 * @rxq_index: RX queue index
3165 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3166 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3168 * Drivers that implement ndo_rx_flow_steer() should periodically call
3169 * this function for each installed filter and remove the filters for
3170 * which it returns %true.
3172 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3173 u32 flow_id
, u16 filter_id
)
3175 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3176 struct rps_dev_flow_table
*flow_table
;
3177 struct rps_dev_flow
*rflow
;
3182 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3183 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3184 rflow
= &flow_table
->flows
[flow_id
];
3185 cpu
= ACCESS_ONCE(rflow
->cpu
);
3186 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
3187 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3188 rflow
->last_qtail
) <
3189 (int)(10 * flow_table
->mask
)))
3195 EXPORT_SYMBOL(rps_may_expire_flow
);
3197 #endif /* CONFIG_RFS_ACCEL */
3199 /* Called from hardirq (IPI) context */
3200 static void rps_trigger_softirq(void *data
)
3202 struct softnet_data
*sd
= data
;
3204 ____napi_schedule(sd
, &sd
->backlog
);
3208 #endif /* CONFIG_RPS */
3211 * Check if this softnet_data structure is another cpu one
3212 * If yes, queue it to our IPI list and return 1
3215 static int rps_ipi_queued(struct softnet_data
*sd
)
3218 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
3221 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3222 mysd
->rps_ipi_list
= sd
;
3224 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3227 #endif /* CONFIG_RPS */
3231 #ifdef CONFIG_NET_FLOW_LIMIT
3232 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3235 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3237 #ifdef CONFIG_NET_FLOW_LIMIT
3238 struct sd_flow_limit
*fl
;
3239 struct softnet_data
*sd
;
3240 unsigned int old_flow
, new_flow
;
3242 if (qlen
< (netdev_max_backlog
>> 1))
3245 sd
= &__get_cpu_var(softnet_data
);
3248 fl
= rcu_dereference(sd
->flow_limit
);
3250 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3251 old_flow
= fl
->history
[fl
->history_head
];
3252 fl
->history
[fl
->history_head
] = new_flow
;
3255 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3257 if (likely(fl
->buckets
[old_flow
]))
3258 fl
->buckets
[old_flow
]--;
3260 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3272 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3273 * queue (may be a remote CPU queue).
3275 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3276 unsigned int *qtail
)
3278 struct softnet_data
*sd
;
3279 unsigned long flags
;
3282 sd
= &per_cpu(softnet_data
, cpu
);
3284 local_irq_save(flags
);
3287 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3288 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3289 if (skb_queue_len(&sd
->input_pkt_queue
)) {
3291 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3292 input_queue_tail_incr_save(sd
, qtail
);
3294 local_irq_restore(flags
);
3295 return NET_RX_SUCCESS
;
3298 /* Schedule NAPI for backlog device
3299 * We can use non atomic operation since we own the queue lock
3301 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3302 if (!rps_ipi_queued(sd
))
3303 ____napi_schedule(sd
, &sd
->backlog
);
3311 local_irq_restore(flags
);
3313 atomic_long_inc(&skb
->dev
->rx_dropped
);
3318 static int netif_rx_internal(struct sk_buff
*skb
)
3322 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3324 trace_netif_rx(skb
);
3326 if (static_key_false(&rps_needed
)) {
3327 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3333 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3335 cpu
= smp_processor_id();
3337 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3345 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3352 * netif_rx - post buffer to the network code
3353 * @skb: buffer to post
3355 * This function receives a packet from a device driver and queues it for
3356 * the upper (protocol) levels to process. It always succeeds. The buffer
3357 * may be dropped during processing for congestion control or by the
3361 * NET_RX_SUCCESS (no congestion)
3362 * NET_RX_DROP (packet was dropped)
3366 int netif_rx(struct sk_buff
*skb
)
3368 trace_netif_rx_entry(skb
);
3370 return netif_rx_internal(skb
);
3372 EXPORT_SYMBOL(netif_rx
);
3374 int netif_rx_ni(struct sk_buff
*skb
)
3378 trace_netif_rx_ni_entry(skb
);
3381 err
= netif_rx_internal(skb
);
3382 if (local_softirq_pending())
3388 EXPORT_SYMBOL(netif_rx_ni
);
3390 static void net_tx_action(struct softirq_action
*h
)
3392 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3394 if (sd
->completion_queue
) {
3395 struct sk_buff
*clist
;
3397 local_irq_disable();
3398 clist
= sd
->completion_queue
;
3399 sd
->completion_queue
= NULL
;
3403 struct sk_buff
*skb
= clist
;
3404 clist
= clist
->next
;
3406 WARN_ON(atomic_read(&skb
->users
));
3407 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
3408 trace_consume_skb(skb
);
3410 trace_kfree_skb(skb
, net_tx_action
);
3415 if (sd
->output_queue
) {
3418 local_irq_disable();
3419 head
= sd
->output_queue
;
3420 sd
->output_queue
= NULL
;
3421 sd
->output_queue_tailp
= &sd
->output_queue
;
3425 struct Qdisc
*q
= head
;
3426 spinlock_t
*root_lock
;
3428 head
= head
->next_sched
;
3430 root_lock
= qdisc_lock(q
);
3431 if (spin_trylock(root_lock
)) {
3432 smp_mb__before_atomic();
3433 clear_bit(__QDISC_STATE_SCHED
,
3436 spin_unlock(root_lock
);
3438 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3440 __netif_reschedule(q
);
3442 smp_mb__before_atomic();
3443 clear_bit(__QDISC_STATE_SCHED
,
3451 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3452 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3453 /* This hook is defined here for ATM LANE */
3454 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3455 unsigned char *addr
) __read_mostly
;
3456 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3459 #ifdef CONFIG_NET_CLS_ACT
3460 /* TODO: Maybe we should just force sch_ingress to be compiled in
3461 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3462 * a compare and 2 stores extra right now if we dont have it on
3463 * but have CONFIG_NET_CLS_ACT
3464 * NOTE: This doesn't stop any functionality; if you dont have
3465 * the ingress scheduler, you just can't add policies on ingress.
3468 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3470 struct net_device
*dev
= skb
->dev
;
3471 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3472 int result
= TC_ACT_OK
;
3475 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3476 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3477 skb
->skb_iif
, dev
->ifindex
);
3481 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3482 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3484 q
= rcu_dereference(rxq
->qdisc
);
3485 if (q
!= &noop_qdisc
) {
3486 spin_lock(qdisc_lock(q
));
3487 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3488 result
= qdisc_enqueue_root(skb
, q
);
3489 spin_unlock(qdisc_lock(q
));
3495 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3496 struct packet_type
**pt_prev
,
3497 int *ret
, struct net_device
*orig_dev
)
3499 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3501 if (!rxq
|| rcu_access_pointer(rxq
->qdisc
) == &noop_qdisc
)
3505 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3509 switch (ing_filter(skb
, rxq
)) {
3523 * netdev_rx_handler_register - register receive handler
3524 * @dev: device to register a handler for
3525 * @rx_handler: receive handler to register
3526 * @rx_handler_data: data pointer that is used by rx handler
3528 * Register a receive handler for a device. This handler will then be
3529 * called from __netif_receive_skb. A negative errno code is returned
3532 * The caller must hold the rtnl_mutex.
3534 * For a general description of rx_handler, see enum rx_handler_result.
3536 int netdev_rx_handler_register(struct net_device
*dev
,
3537 rx_handler_func_t
*rx_handler
,
3538 void *rx_handler_data
)
3542 if (dev
->rx_handler
)
3545 /* Note: rx_handler_data must be set before rx_handler */
3546 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3547 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3551 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3554 * netdev_rx_handler_unregister - unregister receive handler
3555 * @dev: device to unregister a handler from
3557 * Unregister a receive handler from a device.
3559 * The caller must hold the rtnl_mutex.
3561 void netdev_rx_handler_unregister(struct net_device
*dev
)
3565 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3566 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3567 * section has a guarantee to see a non NULL rx_handler_data
3571 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3573 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3576 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3577 * the special handling of PFMEMALLOC skbs.
3579 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3581 switch (skb
->protocol
) {
3582 case htons(ETH_P_ARP
):
3583 case htons(ETH_P_IP
):
3584 case htons(ETH_P_IPV6
):
3585 case htons(ETH_P_8021Q
):
3586 case htons(ETH_P_8021AD
):
3593 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3595 struct packet_type
*ptype
, *pt_prev
;
3596 rx_handler_func_t
*rx_handler
;
3597 struct net_device
*orig_dev
;
3598 struct net_device
*null_or_dev
;
3599 bool deliver_exact
= false;
3600 int ret
= NET_RX_DROP
;
3603 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3605 trace_netif_receive_skb(skb
);
3607 orig_dev
= skb
->dev
;
3609 skb_reset_network_header(skb
);
3610 if (!skb_transport_header_was_set(skb
))
3611 skb_reset_transport_header(skb
);
3612 skb_reset_mac_len(skb
);
3619 skb
->skb_iif
= skb
->dev
->ifindex
;
3621 __this_cpu_inc(softnet_data
.processed
);
3623 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
3624 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
3625 skb
= skb_vlan_untag(skb
);
3630 #ifdef CONFIG_NET_CLS_ACT
3631 if (skb
->tc_verd
& TC_NCLS
) {
3632 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3640 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3641 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3643 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3649 #ifdef CONFIG_NET_CLS_ACT
3650 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3656 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3659 if (vlan_tx_tag_present(skb
)) {
3661 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3664 if (vlan_do_receive(&skb
))
3666 else if (unlikely(!skb
))
3670 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3673 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3676 switch (rx_handler(&skb
)) {
3677 case RX_HANDLER_CONSUMED
:
3678 ret
= NET_RX_SUCCESS
;
3680 case RX_HANDLER_ANOTHER
:
3682 case RX_HANDLER_EXACT
:
3683 deliver_exact
= true;
3684 case RX_HANDLER_PASS
:
3691 if (unlikely(vlan_tx_tag_present(skb
))) {
3692 if (vlan_tx_tag_get_id(skb
))
3693 skb
->pkt_type
= PACKET_OTHERHOST
;
3694 /* Note: we might in the future use prio bits
3695 * and set skb->priority like in vlan_do_receive()
3696 * For the time being, just ignore Priority Code Point
3701 /* deliver only exact match when indicated */
3702 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3704 type
= skb
->protocol
;
3705 list_for_each_entry_rcu(ptype
,
3706 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3707 if (ptype
->type
== type
&&
3708 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3709 ptype
->dev
== orig_dev
)) {
3711 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3717 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3720 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3723 atomic_long_inc(&skb
->dev
->rx_dropped
);
3725 /* Jamal, now you will not able to escape explaining
3726 * me how you were going to use this. :-)
3736 static int __netif_receive_skb(struct sk_buff
*skb
)
3740 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3741 unsigned long pflags
= current
->flags
;
3744 * PFMEMALLOC skbs are special, they should
3745 * - be delivered to SOCK_MEMALLOC sockets only
3746 * - stay away from userspace
3747 * - have bounded memory usage
3749 * Use PF_MEMALLOC as this saves us from propagating the allocation
3750 * context down to all allocation sites.
3752 current
->flags
|= PF_MEMALLOC
;
3753 ret
= __netif_receive_skb_core(skb
, true);
3754 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3756 ret
= __netif_receive_skb_core(skb
, false);
3761 static int netif_receive_skb_internal(struct sk_buff
*skb
)
3763 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3765 if (skb_defer_rx_timestamp(skb
))
3766 return NET_RX_SUCCESS
;
3769 if (static_key_false(&rps_needed
)) {
3770 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3775 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3778 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3785 return __netif_receive_skb(skb
);
3789 * netif_receive_skb - process receive buffer from network
3790 * @skb: buffer to process
3792 * netif_receive_skb() is the main receive data processing function.
3793 * It always succeeds. The buffer may be dropped during processing
3794 * for congestion control or by the protocol layers.
3796 * This function may only be called from softirq context and interrupts
3797 * should be enabled.
3799 * Return values (usually ignored):
3800 * NET_RX_SUCCESS: no congestion
3801 * NET_RX_DROP: packet was dropped
3803 int netif_receive_skb(struct sk_buff
*skb
)
3805 trace_netif_receive_skb_entry(skb
);
3807 return netif_receive_skb_internal(skb
);
3809 EXPORT_SYMBOL(netif_receive_skb
);
3811 /* Network device is going away, flush any packets still pending
3812 * Called with irqs disabled.
3814 static void flush_backlog(void *arg
)
3816 struct net_device
*dev
= arg
;
3817 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3818 struct sk_buff
*skb
, *tmp
;
3821 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3822 if (skb
->dev
== dev
) {
3823 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3825 input_queue_head_incr(sd
);
3830 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3831 if (skb
->dev
== dev
) {
3832 __skb_unlink(skb
, &sd
->process_queue
);
3834 input_queue_head_incr(sd
);
3839 static int napi_gro_complete(struct sk_buff
*skb
)
3841 struct packet_offload
*ptype
;
3842 __be16 type
= skb
->protocol
;
3843 struct list_head
*head
= &offload_base
;
3846 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
3848 if (NAPI_GRO_CB(skb
)->count
== 1) {
3849 skb_shinfo(skb
)->gso_size
= 0;
3854 list_for_each_entry_rcu(ptype
, head
, list
) {
3855 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
3858 err
= ptype
->callbacks
.gro_complete(skb
, 0);
3864 WARN_ON(&ptype
->list
== head
);
3866 return NET_RX_SUCCESS
;
3870 return netif_receive_skb_internal(skb
);
3873 /* napi->gro_list contains packets ordered by age.
3874 * youngest packets at the head of it.
3875 * Complete skbs in reverse order to reduce latencies.
3877 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
3879 struct sk_buff
*skb
, *prev
= NULL
;
3881 /* scan list and build reverse chain */
3882 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
3887 for (skb
= prev
; skb
; skb
= prev
) {
3890 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
3894 napi_gro_complete(skb
);
3898 napi
->gro_list
= NULL
;
3900 EXPORT_SYMBOL(napi_gro_flush
);
3902 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
3905 unsigned int maclen
= skb
->dev
->hard_header_len
;
3906 u32 hash
= skb_get_hash_raw(skb
);
3908 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3909 unsigned long diffs
;
3911 NAPI_GRO_CB(p
)->flush
= 0;
3913 if (hash
!= skb_get_hash_raw(p
)) {
3914 NAPI_GRO_CB(p
)->same_flow
= 0;
3918 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3919 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3920 if (maclen
== ETH_HLEN
)
3921 diffs
|= compare_ether_header(skb_mac_header(p
),
3922 skb_mac_header(skb
));
3924 diffs
= memcmp(skb_mac_header(p
),
3925 skb_mac_header(skb
),
3927 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3931 static void skb_gro_reset_offset(struct sk_buff
*skb
)
3933 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3934 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
3936 NAPI_GRO_CB(skb
)->data_offset
= 0;
3937 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3938 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3940 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
3942 !PageHighMem(skb_frag_page(frag0
))) {
3943 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
3944 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
3948 static void gro_pull_from_frag0(struct sk_buff
*skb
, int grow
)
3950 struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3952 BUG_ON(skb
->end
- skb
->tail
< grow
);
3954 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3956 skb
->data_len
-= grow
;
3959 pinfo
->frags
[0].page_offset
+= grow
;
3960 skb_frag_size_sub(&pinfo
->frags
[0], grow
);
3962 if (unlikely(!skb_frag_size(&pinfo
->frags
[0]))) {
3963 skb_frag_unref(skb
, 0);
3964 memmove(pinfo
->frags
, pinfo
->frags
+ 1,
3965 --pinfo
->nr_frags
* sizeof(pinfo
->frags
[0]));
3969 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3971 struct sk_buff
**pp
= NULL
;
3972 struct packet_offload
*ptype
;
3973 __be16 type
= skb
->protocol
;
3974 struct list_head
*head
= &offload_base
;
3976 enum gro_result ret
;
3979 if (!(skb
->dev
->features
& NETIF_F_GRO
))
3982 if (skb_is_gso(skb
) || skb_has_frag_list(skb
) || skb
->csum_bad
)
3985 gro_list_prepare(napi
, skb
);
3988 list_for_each_entry_rcu(ptype
, head
, list
) {
3989 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
3992 skb_set_network_header(skb
, skb_gro_offset(skb
));
3993 skb_reset_mac_len(skb
);
3994 NAPI_GRO_CB(skb
)->same_flow
= 0;
3995 NAPI_GRO_CB(skb
)->flush
= 0;
3996 NAPI_GRO_CB(skb
)->free
= 0;
3997 NAPI_GRO_CB(skb
)->udp_mark
= 0;
3999 /* Setup for GRO checksum validation */
4000 switch (skb
->ip_summed
) {
4001 case CHECKSUM_COMPLETE
:
4002 NAPI_GRO_CB(skb
)->csum
= skb
->csum
;
4003 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4004 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4006 case CHECKSUM_UNNECESSARY
:
4007 NAPI_GRO_CB(skb
)->csum_cnt
= skb
->csum_level
+ 1;
4008 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4011 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4012 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4015 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
4020 if (&ptype
->list
== head
)
4023 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
4024 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
4027 struct sk_buff
*nskb
= *pp
;
4031 napi_gro_complete(nskb
);
4038 if (NAPI_GRO_CB(skb
)->flush
)
4041 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
4042 struct sk_buff
*nskb
= napi
->gro_list
;
4044 /* locate the end of the list to select the 'oldest' flow */
4045 while (nskb
->next
) {
4051 napi_gro_complete(nskb
);
4055 NAPI_GRO_CB(skb
)->count
= 1;
4056 NAPI_GRO_CB(skb
)->age
= jiffies
;
4057 NAPI_GRO_CB(skb
)->last
= skb
;
4058 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
4059 skb
->next
= napi
->gro_list
;
4060 napi
->gro_list
= skb
;
4064 grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
4066 gro_pull_from_frag0(skb
, grow
);
4075 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
4077 struct list_head
*offload_head
= &offload_base
;
4078 struct packet_offload
*ptype
;
4080 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4081 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4087 EXPORT_SYMBOL(gro_find_receive_by_type
);
4089 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
4091 struct list_head
*offload_head
= &offload_base
;
4092 struct packet_offload
*ptype
;
4094 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4095 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4101 EXPORT_SYMBOL(gro_find_complete_by_type
);
4103 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
4107 if (netif_receive_skb_internal(skb
))
4115 case GRO_MERGED_FREE
:
4116 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
4117 kmem_cache_free(skbuff_head_cache
, skb
);
4130 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4132 trace_napi_gro_receive_entry(skb
);
4134 skb_gro_reset_offset(skb
);
4136 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4138 EXPORT_SYMBOL(napi_gro_receive
);
4140 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4142 __skb_pull(skb
, skb_headlen(skb
));
4143 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4144 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
4146 skb
->dev
= napi
->dev
;
4148 skb
->encapsulation
= 0;
4149 skb_shinfo(skb
)->gso_type
= 0;
4150 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
4155 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
4157 struct sk_buff
*skb
= napi
->skb
;
4160 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
4165 EXPORT_SYMBOL(napi_get_frags
);
4167 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
4168 struct sk_buff
*skb
,
4174 __skb_push(skb
, ETH_HLEN
);
4175 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4176 if (ret
== GRO_NORMAL
&& netif_receive_skb_internal(skb
))
4181 case GRO_MERGED_FREE
:
4182 napi_reuse_skb(napi
, skb
);
4192 /* Upper GRO stack assumes network header starts at gro_offset=0
4193 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4194 * We copy ethernet header into skb->data to have a common layout.
4196 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4198 struct sk_buff
*skb
= napi
->skb
;
4199 const struct ethhdr
*eth
;
4200 unsigned int hlen
= sizeof(*eth
);
4204 skb_reset_mac_header(skb
);
4205 skb_gro_reset_offset(skb
);
4207 eth
= skb_gro_header_fast(skb
, 0);
4208 if (unlikely(skb_gro_header_hard(skb
, hlen
))) {
4209 eth
= skb_gro_header_slow(skb
, hlen
, 0);
4210 if (unlikely(!eth
)) {
4211 napi_reuse_skb(napi
, skb
);
4215 gro_pull_from_frag0(skb
, hlen
);
4216 NAPI_GRO_CB(skb
)->frag0
+= hlen
;
4217 NAPI_GRO_CB(skb
)->frag0_len
-= hlen
;
4219 __skb_pull(skb
, hlen
);
4222 * This works because the only protocols we care about don't require
4224 * We'll fix it up properly in napi_frags_finish()
4226 skb
->protocol
= eth
->h_proto
;
4231 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4233 struct sk_buff
*skb
= napi_frags_skb(napi
);
4238 trace_napi_gro_frags_entry(skb
);
4240 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4242 EXPORT_SYMBOL(napi_gro_frags
);
4244 /* Compute the checksum from gro_offset and return the folded value
4245 * after adding in any pseudo checksum.
4247 __sum16
__skb_gro_checksum_complete(struct sk_buff
*skb
)
4252 wsum
= skb_checksum(skb
, skb_gro_offset(skb
), skb_gro_len(skb
), 0);
4254 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4255 sum
= csum_fold(csum_add(NAPI_GRO_CB(skb
)->csum
, wsum
));
4257 if (unlikely(skb
->ip_summed
== CHECKSUM_COMPLETE
) &&
4258 !skb
->csum_complete_sw
)
4259 netdev_rx_csum_fault(skb
->dev
);
4262 NAPI_GRO_CB(skb
)->csum
= wsum
;
4263 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4267 EXPORT_SYMBOL(__skb_gro_checksum_complete
);
4270 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4271 * Note: called with local irq disabled, but exits with local irq enabled.
4273 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4276 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4279 sd
->rps_ipi_list
= NULL
;
4283 /* Send pending IPI's to kick RPS processing on remote cpus. */
4285 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4287 if (cpu_online(remsd
->cpu
))
4288 smp_call_function_single_async(remsd
->cpu
,
4297 static int process_backlog(struct napi_struct
*napi
, int quota
)
4300 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4303 /* Check if we have pending ipi, its better to send them now,
4304 * not waiting net_rx_action() end.
4306 if (sd
->rps_ipi_list
) {
4307 local_irq_disable();
4308 net_rps_action_and_irq_enable(sd
);
4311 napi
->weight
= weight_p
;
4312 local_irq_disable();
4314 struct sk_buff
*skb
;
4316 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4318 __netif_receive_skb(skb
);
4319 local_irq_disable();
4320 input_queue_head_incr(sd
);
4321 if (++work
>= quota
) {
4328 if (skb_queue_empty(&sd
->input_pkt_queue
)) {
4330 * Inline a custom version of __napi_complete().
4331 * only current cpu owns and manipulates this napi,
4332 * and NAPI_STATE_SCHED is the only possible flag set
4334 * We can use a plain write instead of clear_bit(),
4335 * and we dont need an smp_mb() memory barrier.
4337 list_del(&napi
->poll_list
);
4344 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4345 &sd
->process_queue
);
4354 * __napi_schedule - schedule for receive
4355 * @n: entry to schedule
4357 * The entry's receive function will be scheduled to run
4359 void __napi_schedule(struct napi_struct
*n
)
4361 unsigned long flags
;
4363 local_irq_save(flags
);
4364 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
4365 local_irq_restore(flags
);
4367 EXPORT_SYMBOL(__napi_schedule
);
4369 void __napi_complete(struct napi_struct
*n
)
4371 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4372 BUG_ON(n
->gro_list
);
4374 list_del(&n
->poll_list
);
4375 smp_mb__before_atomic();
4376 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4378 EXPORT_SYMBOL(__napi_complete
);
4380 void napi_complete(struct napi_struct
*n
)
4382 unsigned long flags
;
4385 * don't let napi dequeue from the cpu poll list
4386 * just in case its running on a different cpu
4388 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4391 napi_gro_flush(n
, false);
4392 local_irq_save(flags
);
4394 local_irq_restore(flags
);
4396 EXPORT_SYMBOL(napi_complete
);
4398 /* must be called under rcu_read_lock(), as we dont take a reference */
4399 struct napi_struct
*napi_by_id(unsigned int napi_id
)
4401 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4402 struct napi_struct
*napi
;
4404 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4405 if (napi
->napi_id
== napi_id
)
4410 EXPORT_SYMBOL_GPL(napi_by_id
);
4412 void napi_hash_add(struct napi_struct
*napi
)
4414 if (!test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
4416 spin_lock(&napi_hash_lock
);
4418 /* 0 is not a valid id, we also skip an id that is taken
4419 * we expect both events to be extremely rare
4422 while (!napi
->napi_id
) {
4423 napi
->napi_id
= ++napi_gen_id
;
4424 if (napi_by_id(napi
->napi_id
))
4428 hlist_add_head_rcu(&napi
->napi_hash_node
,
4429 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
4431 spin_unlock(&napi_hash_lock
);
4434 EXPORT_SYMBOL_GPL(napi_hash_add
);
4436 /* Warning : caller is responsible to make sure rcu grace period
4437 * is respected before freeing memory containing @napi
4439 void napi_hash_del(struct napi_struct
*napi
)
4441 spin_lock(&napi_hash_lock
);
4443 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
))
4444 hlist_del_rcu(&napi
->napi_hash_node
);
4446 spin_unlock(&napi_hash_lock
);
4448 EXPORT_SYMBOL_GPL(napi_hash_del
);
4450 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4451 int (*poll
)(struct napi_struct
*, int), int weight
)
4453 INIT_LIST_HEAD(&napi
->poll_list
);
4454 napi
->gro_count
= 0;
4455 napi
->gro_list
= NULL
;
4458 if (weight
> NAPI_POLL_WEIGHT
)
4459 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4461 napi
->weight
= weight
;
4462 list_add(&napi
->dev_list
, &dev
->napi_list
);
4464 #ifdef CONFIG_NETPOLL
4465 spin_lock_init(&napi
->poll_lock
);
4466 napi
->poll_owner
= -1;
4468 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4470 EXPORT_SYMBOL(netif_napi_add
);
4472 void netif_napi_del(struct napi_struct
*napi
)
4474 list_del_init(&napi
->dev_list
);
4475 napi_free_frags(napi
);
4477 kfree_skb_list(napi
->gro_list
);
4478 napi
->gro_list
= NULL
;
4479 napi
->gro_count
= 0;
4481 EXPORT_SYMBOL(netif_napi_del
);
4483 static void net_rx_action(struct softirq_action
*h
)
4485 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
4486 unsigned long time_limit
= jiffies
+ 2;
4487 int budget
= netdev_budget
;
4490 local_irq_disable();
4492 while (!list_empty(&sd
->poll_list
)) {
4493 struct napi_struct
*n
;
4496 /* If softirq window is exhuasted then punt.
4497 * Allow this to run for 2 jiffies since which will allow
4498 * an average latency of 1.5/HZ.
4500 if (unlikely(budget
<= 0 || time_after_eq(jiffies
, time_limit
)))
4505 /* Even though interrupts have been re-enabled, this
4506 * access is safe because interrupts can only add new
4507 * entries to the tail of this list, and only ->poll()
4508 * calls can remove this head entry from the list.
4510 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
4512 have
= netpoll_poll_lock(n
);
4516 /* This NAPI_STATE_SCHED test is for avoiding a race
4517 * with netpoll's poll_napi(). Only the entity which
4518 * obtains the lock and sees NAPI_STATE_SCHED set will
4519 * actually make the ->poll() call. Therefore we avoid
4520 * accidentally calling ->poll() when NAPI is not scheduled.
4523 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4524 work
= n
->poll(n
, weight
);
4528 WARN_ON_ONCE(work
> weight
);
4532 local_irq_disable();
4534 /* Drivers must not modify the NAPI state if they
4535 * consume the entire weight. In such cases this code
4536 * still "owns" the NAPI instance and therefore can
4537 * move the instance around on the list at-will.
4539 if (unlikely(work
== weight
)) {
4540 if (unlikely(napi_disable_pending(n
))) {
4543 local_irq_disable();
4546 /* flush too old packets
4547 * If HZ < 1000, flush all packets.
4550 napi_gro_flush(n
, HZ
>= 1000);
4551 local_irq_disable();
4553 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
4557 netpoll_poll_unlock(have
);
4560 net_rps_action_and_irq_enable(sd
);
4562 #ifdef CONFIG_NET_DMA
4564 * There may not be any more sk_buffs coming right now, so push
4565 * any pending DMA copies to hardware
4567 dma_issue_pending_all();
4574 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4578 struct netdev_adjacent
{
4579 struct net_device
*dev
;
4581 /* upper master flag, there can only be one master device per list */
4584 /* counter for the number of times this device was added to us */
4587 /* private field for the users */
4590 struct list_head list
;
4591 struct rcu_head rcu
;
4594 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*dev
,
4595 struct net_device
*adj_dev
,
4596 struct list_head
*adj_list
)
4598 struct netdev_adjacent
*adj
;
4600 list_for_each_entry(adj
, adj_list
, list
) {
4601 if (adj
->dev
== adj_dev
)
4608 * netdev_has_upper_dev - Check if device is linked to an upper device
4610 * @upper_dev: upper device to check
4612 * Find out if a device is linked to specified upper device and return true
4613 * in case it is. Note that this checks only immediate upper device,
4614 * not through a complete stack of devices. The caller must hold the RTNL lock.
4616 bool netdev_has_upper_dev(struct net_device
*dev
,
4617 struct net_device
*upper_dev
)
4621 return __netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
);
4623 EXPORT_SYMBOL(netdev_has_upper_dev
);
4626 * netdev_has_any_upper_dev - Check if device is linked to some device
4629 * Find out if a device is linked to an upper device and return true in case
4630 * it is. The caller must hold the RTNL lock.
4632 static bool netdev_has_any_upper_dev(struct net_device
*dev
)
4636 return !list_empty(&dev
->all_adj_list
.upper
);
4640 * netdev_master_upper_dev_get - Get master upper device
4643 * Find a master upper device and return pointer to it or NULL in case
4644 * it's not there. The caller must hold the RTNL lock.
4646 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4648 struct netdev_adjacent
*upper
;
4652 if (list_empty(&dev
->adj_list
.upper
))
4655 upper
= list_first_entry(&dev
->adj_list
.upper
,
4656 struct netdev_adjacent
, list
);
4657 if (likely(upper
->master
))
4661 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4663 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
4665 struct netdev_adjacent
*adj
;
4667 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
4669 return adj
->private;
4671 EXPORT_SYMBOL(netdev_adjacent_get_private
);
4674 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
4676 * @iter: list_head ** of the current position
4678 * Gets the next device from the dev's upper list, starting from iter
4679 * position. The caller must hold RCU read lock.
4681 struct net_device
*netdev_upper_get_next_dev_rcu(struct net_device
*dev
,
4682 struct list_head
**iter
)
4684 struct netdev_adjacent
*upper
;
4686 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4688 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4690 if (&upper
->list
== &dev
->adj_list
.upper
)
4693 *iter
= &upper
->list
;
4697 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu
);
4700 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4702 * @iter: list_head ** of the current position
4704 * Gets the next device from the dev's upper list, starting from iter
4705 * position. The caller must hold RCU read lock.
4707 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
4708 struct list_head
**iter
)
4710 struct netdev_adjacent
*upper
;
4712 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4714 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4716 if (&upper
->list
== &dev
->all_adj_list
.upper
)
4719 *iter
= &upper
->list
;
4723 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
4726 * netdev_lower_get_next_private - Get the next ->private from the
4727 * lower neighbour list
4729 * @iter: list_head ** of the current position
4731 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4732 * list, starting from iter position. The caller must hold either hold the
4733 * RTNL lock or its own locking that guarantees that the neighbour lower
4734 * list will remain unchainged.
4736 void *netdev_lower_get_next_private(struct net_device
*dev
,
4737 struct list_head
**iter
)
4739 struct netdev_adjacent
*lower
;
4741 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
4743 if (&lower
->list
== &dev
->adj_list
.lower
)
4746 *iter
= lower
->list
.next
;
4748 return lower
->private;
4750 EXPORT_SYMBOL(netdev_lower_get_next_private
);
4753 * netdev_lower_get_next_private_rcu - Get the next ->private from the
4754 * lower neighbour list, RCU
4757 * @iter: list_head ** of the current position
4759 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4760 * list, starting from iter position. The caller must hold RCU read lock.
4762 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
4763 struct list_head
**iter
)
4765 struct netdev_adjacent
*lower
;
4767 WARN_ON_ONCE(!rcu_read_lock_held());
4769 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
4771 if (&lower
->list
== &dev
->adj_list
.lower
)
4774 *iter
= &lower
->list
;
4776 return lower
->private;
4778 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
4781 * netdev_lower_get_next - Get the next device from the lower neighbour
4784 * @iter: list_head ** of the current position
4786 * Gets the next netdev_adjacent from the dev's lower neighbour
4787 * list, starting from iter position. The caller must hold RTNL lock or
4788 * its own locking that guarantees that the neighbour lower
4789 * list will remain unchainged.
4791 void *netdev_lower_get_next(struct net_device
*dev
, struct list_head
**iter
)
4793 struct netdev_adjacent
*lower
;
4795 lower
= list_entry((*iter
)->next
, struct netdev_adjacent
, list
);
4797 if (&lower
->list
== &dev
->adj_list
.lower
)
4800 *iter
= &lower
->list
;
4804 EXPORT_SYMBOL(netdev_lower_get_next
);
4807 * netdev_lower_get_first_private_rcu - Get the first ->private from the
4808 * lower neighbour list, RCU
4812 * Gets the first netdev_adjacent->private from the dev's lower neighbour
4813 * list. The caller must hold RCU read lock.
4815 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
4817 struct netdev_adjacent
*lower
;
4819 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
4820 struct netdev_adjacent
, list
);
4822 return lower
->private;
4825 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
4828 * netdev_master_upper_dev_get_rcu - Get master upper device
4831 * Find a master upper device and return pointer to it or NULL in case
4832 * it's not there. The caller must hold the RCU read lock.
4834 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
4836 struct netdev_adjacent
*upper
;
4838 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
4839 struct netdev_adjacent
, list
);
4840 if (upper
&& likely(upper
->master
))
4844 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
4846 static int netdev_adjacent_sysfs_add(struct net_device
*dev
,
4847 struct net_device
*adj_dev
,
4848 struct list_head
*dev_list
)
4850 char linkname
[IFNAMSIZ
+7];
4851 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
4852 "upper_%s" : "lower_%s", adj_dev
->name
);
4853 return sysfs_create_link(&(dev
->dev
.kobj
), &(adj_dev
->dev
.kobj
),
4856 static void netdev_adjacent_sysfs_del(struct net_device
*dev
,
4858 struct list_head
*dev_list
)
4860 char linkname
[IFNAMSIZ
+7];
4861 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
4862 "upper_%s" : "lower_%s", name
);
4863 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
4866 #define netdev_adjacent_is_neigh_list(dev, dev_list) \
4867 (dev_list == &dev->adj_list.upper || \
4868 dev_list == &dev->adj_list.lower)
4870 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
4871 struct net_device
*adj_dev
,
4872 struct list_head
*dev_list
,
4873 void *private, bool master
)
4875 struct netdev_adjacent
*adj
;
4878 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
4885 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
4890 adj
->master
= master
;
4892 adj
->private = private;
4895 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
4896 adj_dev
->name
, dev
->name
, adj_dev
->name
);
4898 if (netdev_adjacent_is_neigh_list(dev
, dev_list
)) {
4899 ret
= netdev_adjacent_sysfs_add(dev
, adj_dev
, dev_list
);
4904 /* Ensure that master link is always the first item in list. */
4906 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
4907 &(adj_dev
->dev
.kobj
), "master");
4909 goto remove_symlinks
;
4911 list_add_rcu(&adj
->list
, dev_list
);
4913 list_add_tail_rcu(&adj
->list
, dev_list
);
4919 if (netdev_adjacent_is_neigh_list(dev
, dev_list
))
4920 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
4928 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
4929 struct net_device
*adj_dev
,
4930 struct list_head
*dev_list
)
4932 struct netdev_adjacent
*adj
;
4934 adj
= __netdev_find_adj(dev
, adj_dev
, dev_list
);
4937 pr_err("tried to remove device %s from %s\n",
4938 dev
->name
, adj_dev
->name
);
4942 if (adj
->ref_nr
> 1) {
4943 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
4950 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
4952 if (netdev_adjacent_is_neigh_list(dev
, dev_list
) &&
4953 net_eq(dev_net(dev
),dev_net(adj_dev
)))
4954 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
4956 list_del_rcu(&adj
->list
);
4957 pr_debug("dev_put for %s, because link removed from %s to %s\n",
4958 adj_dev
->name
, dev
->name
, adj_dev
->name
);
4960 kfree_rcu(adj
, rcu
);
4963 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
4964 struct net_device
*upper_dev
,
4965 struct list_head
*up_list
,
4966 struct list_head
*down_list
,
4967 void *private, bool master
)
4971 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
4976 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
4979 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
4986 static int __netdev_adjacent_dev_link(struct net_device
*dev
,
4987 struct net_device
*upper_dev
)
4989 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
4990 &dev
->all_adj_list
.upper
,
4991 &upper_dev
->all_adj_list
.lower
,
4995 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
4996 struct net_device
*upper_dev
,
4997 struct list_head
*up_list
,
4998 struct list_head
*down_list
)
5000 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5001 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
5004 static void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
5005 struct net_device
*upper_dev
)
5007 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5008 &dev
->all_adj_list
.upper
,
5009 &upper_dev
->all_adj_list
.lower
);
5012 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
5013 struct net_device
*upper_dev
,
5014 void *private, bool master
)
5016 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
5021 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5022 &dev
->adj_list
.upper
,
5023 &upper_dev
->adj_list
.lower
,
5026 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5033 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
5034 struct net_device
*upper_dev
)
5036 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5037 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5038 &dev
->adj_list
.upper
,
5039 &upper_dev
->adj_list
.lower
);
5042 static int __netdev_upper_dev_link(struct net_device
*dev
,
5043 struct net_device
*upper_dev
, bool master
,
5046 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
5051 if (dev
== upper_dev
)
5054 /* To prevent loops, check if dev is not upper device to upper_dev. */
5055 if (__netdev_find_adj(upper_dev
, dev
, &upper_dev
->all_adj_list
.upper
))
5058 if (__netdev_find_adj(dev
, upper_dev
, &dev
->all_adj_list
.upper
))
5061 if (master
&& netdev_master_upper_dev_get(dev
))
5064 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, private,
5069 /* Now that we linked these devs, make all the upper_dev's
5070 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5071 * versa, and don't forget the devices itself. All of these
5072 * links are non-neighbours.
5074 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5075 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5076 pr_debug("Interlinking %s with %s, non-neighbour\n",
5077 i
->dev
->name
, j
->dev
->name
);
5078 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
5084 /* add dev to every upper_dev's upper device */
5085 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5086 pr_debug("linking %s's upper device %s with %s\n",
5087 upper_dev
->name
, i
->dev
->name
, dev
->name
);
5088 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
5090 goto rollback_upper_mesh
;
5093 /* add upper_dev to every dev's lower device */
5094 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5095 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
5096 i
->dev
->name
, upper_dev
->name
);
5097 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
5099 goto rollback_lower_mesh
;
5102 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
5105 rollback_lower_mesh
:
5107 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5110 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5115 rollback_upper_mesh
:
5117 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5120 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5128 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5129 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5130 if (i
== to_i
&& j
== to_j
)
5132 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5138 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5144 * netdev_upper_dev_link - Add a link to the upper device
5146 * @upper_dev: new upper device
5148 * Adds a link to device which is upper to this one. The caller must hold
5149 * the RTNL lock. On a failure a negative errno code is returned.
5150 * On success the reference counts are adjusted and the function
5153 int netdev_upper_dev_link(struct net_device
*dev
,
5154 struct net_device
*upper_dev
)
5156 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
);
5158 EXPORT_SYMBOL(netdev_upper_dev_link
);
5161 * netdev_master_upper_dev_link - Add a master link to the upper device
5163 * @upper_dev: new upper device
5165 * Adds a link to device which is upper to this one. In this case, only
5166 * one master upper device can be linked, although other non-master devices
5167 * might be linked as well. The caller must hold the RTNL lock.
5168 * On a failure a negative errno code is returned. On success the reference
5169 * counts are adjusted and the function returns zero.
5171 int netdev_master_upper_dev_link(struct net_device
*dev
,
5172 struct net_device
*upper_dev
)
5174 return __netdev_upper_dev_link(dev
, upper_dev
, true, NULL
);
5176 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
5178 int netdev_master_upper_dev_link_private(struct net_device
*dev
,
5179 struct net_device
*upper_dev
,
5182 return __netdev_upper_dev_link(dev
, upper_dev
, true, private);
5184 EXPORT_SYMBOL(netdev_master_upper_dev_link_private
);
5187 * netdev_upper_dev_unlink - Removes a link to upper device
5189 * @upper_dev: new upper device
5191 * Removes a link to device which is upper to this one. The caller must hold
5194 void netdev_upper_dev_unlink(struct net_device
*dev
,
5195 struct net_device
*upper_dev
)
5197 struct netdev_adjacent
*i
, *j
;
5200 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5202 /* Here is the tricky part. We must remove all dev's lower
5203 * devices from all upper_dev's upper devices and vice
5204 * versa, to maintain the graph relationship.
5206 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5207 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
5208 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5210 /* remove also the devices itself from lower/upper device
5213 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5214 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5216 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
5217 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5219 call_netdevice_notifiers(NETDEV_CHANGEUPPER
, dev
);
5221 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
5223 void netdev_adjacent_add_links(struct net_device
*dev
)
5225 struct netdev_adjacent
*iter
;
5227 struct net
*net
= dev_net(dev
);
5229 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5230 if (!net_eq(net
,dev_net(iter
->dev
)))
5232 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5233 &iter
->dev
->adj_list
.lower
);
5234 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5235 &dev
->adj_list
.upper
);
5238 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5239 if (!net_eq(net
,dev_net(iter
->dev
)))
5241 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5242 &iter
->dev
->adj_list
.upper
);
5243 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5244 &dev
->adj_list
.lower
);
5248 void netdev_adjacent_del_links(struct net_device
*dev
)
5250 struct netdev_adjacent
*iter
;
5252 struct net
*net
= dev_net(dev
);
5254 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5255 if (!net_eq(net
,dev_net(iter
->dev
)))
5257 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5258 &iter
->dev
->adj_list
.lower
);
5259 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5260 &dev
->adj_list
.upper
);
5263 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5264 if (!net_eq(net
,dev_net(iter
->dev
)))
5266 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5267 &iter
->dev
->adj_list
.upper
);
5268 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5269 &dev
->adj_list
.lower
);
5273 void netdev_adjacent_rename_links(struct net_device
*dev
, char *oldname
)
5275 struct netdev_adjacent
*iter
;
5277 struct net
*net
= dev_net(dev
);
5279 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5280 if (!net_eq(net
,dev_net(iter
->dev
)))
5282 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5283 &iter
->dev
->adj_list
.lower
);
5284 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5285 &iter
->dev
->adj_list
.lower
);
5288 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5289 if (!net_eq(net
,dev_net(iter
->dev
)))
5291 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5292 &iter
->dev
->adj_list
.upper
);
5293 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5294 &iter
->dev
->adj_list
.upper
);
5298 void *netdev_lower_dev_get_private(struct net_device
*dev
,
5299 struct net_device
*lower_dev
)
5301 struct netdev_adjacent
*lower
;
5305 lower
= __netdev_find_adj(dev
, lower_dev
, &dev
->adj_list
.lower
);
5309 return lower
->private;
5311 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
5314 int dev_get_nest_level(struct net_device
*dev
,
5315 bool (*type_check
)(struct net_device
*dev
))
5317 struct net_device
*lower
= NULL
;
5318 struct list_head
*iter
;
5324 netdev_for_each_lower_dev(dev
, lower
, iter
) {
5325 nest
= dev_get_nest_level(lower
, type_check
);
5326 if (max_nest
< nest
)
5330 if (type_check(dev
))
5335 EXPORT_SYMBOL(dev_get_nest_level
);
5337 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
5339 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5341 if (ops
->ndo_change_rx_flags
)
5342 ops
->ndo_change_rx_flags(dev
, flags
);
5345 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
5347 unsigned int old_flags
= dev
->flags
;
5353 dev
->flags
|= IFF_PROMISC
;
5354 dev
->promiscuity
+= inc
;
5355 if (dev
->promiscuity
== 0) {
5358 * If inc causes overflow, untouch promisc and return error.
5361 dev
->flags
&= ~IFF_PROMISC
;
5363 dev
->promiscuity
-= inc
;
5364 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5369 if (dev
->flags
!= old_flags
) {
5370 pr_info("device %s %s promiscuous mode\n",
5372 dev
->flags
& IFF_PROMISC
? "entered" : "left");
5373 if (audit_enabled
) {
5374 current_uid_gid(&uid
, &gid
);
5375 audit_log(current
->audit_context
, GFP_ATOMIC
,
5376 AUDIT_ANOM_PROMISCUOUS
,
5377 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5378 dev
->name
, (dev
->flags
& IFF_PROMISC
),
5379 (old_flags
& IFF_PROMISC
),
5380 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
5381 from_kuid(&init_user_ns
, uid
),
5382 from_kgid(&init_user_ns
, gid
),
5383 audit_get_sessionid(current
));
5386 dev_change_rx_flags(dev
, IFF_PROMISC
);
5389 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
5394 * dev_set_promiscuity - update promiscuity count on a device
5398 * Add or remove promiscuity from a device. While the count in the device
5399 * remains above zero the interface remains promiscuous. Once it hits zero
5400 * the device reverts back to normal filtering operation. A negative inc
5401 * value is used to drop promiscuity on the device.
5402 * Return 0 if successful or a negative errno code on error.
5404 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
5406 unsigned int old_flags
= dev
->flags
;
5409 err
= __dev_set_promiscuity(dev
, inc
, true);
5412 if (dev
->flags
!= old_flags
)
5413 dev_set_rx_mode(dev
);
5416 EXPORT_SYMBOL(dev_set_promiscuity
);
5418 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
5420 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5424 dev
->flags
|= IFF_ALLMULTI
;
5425 dev
->allmulti
+= inc
;
5426 if (dev
->allmulti
== 0) {
5429 * If inc causes overflow, untouch allmulti and return error.
5432 dev
->flags
&= ~IFF_ALLMULTI
;
5434 dev
->allmulti
-= inc
;
5435 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5440 if (dev
->flags
^ old_flags
) {
5441 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
5442 dev_set_rx_mode(dev
);
5444 __dev_notify_flags(dev
, old_flags
,
5445 dev
->gflags
^ old_gflags
);
5451 * dev_set_allmulti - update allmulti count on a device
5455 * Add or remove reception of all multicast frames to a device. While the
5456 * count in the device remains above zero the interface remains listening
5457 * to all interfaces. Once it hits zero the device reverts back to normal
5458 * filtering operation. A negative @inc value is used to drop the counter
5459 * when releasing a resource needing all multicasts.
5460 * Return 0 if successful or a negative errno code on error.
5463 int dev_set_allmulti(struct net_device
*dev
, int inc
)
5465 return __dev_set_allmulti(dev
, inc
, true);
5467 EXPORT_SYMBOL(dev_set_allmulti
);
5470 * Upload unicast and multicast address lists to device and
5471 * configure RX filtering. When the device doesn't support unicast
5472 * filtering it is put in promiscuous mode while unicast addresses
5475 void __dev_set_rx_mode(struct net_device
*dev
)
5477 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5479 /* dev_open will call this function so the list will stay sane. */
5480 if (!(dev
->flags
&IFF_UP
))
5483 if (!netif_device_present(dev
))
5486 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
5487 /* Unicast addresses changes may only happen under the rtnl,
5488 * therefore calling __dev_set_promiscuity here is safe.
5490 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
5491 __dev_set_promiscuity(dev
, 1, false);
5492 dev
->uc_promisc
= true;
5493 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
5494 __dev_set_promiscuity(dev
, -1, false);
5495 dev
->uc_promisc
= false;
5499 if (ops
->ndo_set_rx_mode
)
5500 ops
->ndo_set_rx_mode(dev
);
5503 void dev_set_rx_mode(struct net_device
*dev
)
5505 netif_addr_lock_bh(dev
);
5506 __dev_set_rx_mode(dev
);
5507 netif_addr_unlock_bh(dev
);
5511 * dev_get_flags - get flags reported to userspace
5514 * Get the combination of flag bits exported through APIs to userspace.
5516 unsigned int dev_get_flags(const struct net_device
*dev
)
5520 flags
= (dev
->flags
& ~(IFF_PROMISC
|
5525 (dev
->gflags
& (IFF_PROMISC
|
5528 if (netif_running(dev
)) {
5529 if (netif_oper_up(dev
))
5530 flags
|= IFF_RUNNING
;
5531 if (netif_carrier_ok(dev
))
5532 flags
|= IFF_LOWER_UP
;
5533 if (netif_dormant(dev
))
5534 flags
|= IFF_DORMANT
;
5539 EXPORT_SYMBOL(dev_get_flags
);
5541 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5543 unsigned int old_flags
= dev
->flags
;
5549 * Set the flags on our device.
5552 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
5553 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
5555 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
5559 * Load in the correct multicast list now the flags have changed.
5562 if ((old_flags
^ flags
) & IFF_MULTICAST
)
5563 dev_change_rx_flags(dev
, IFF_MULTICAST
);
5565 dev_set_rx_mode(dev
);
5568 * Have we downed the interface. We handle IFF_UP ourselves
5569 * according to user attempts to set it, rather than blindly
5574 if ((old_flags
^ flags
) & IFF_UP
)
5575 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
5577 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
5578 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
5579 unsigned int old_flags
= dev
->flags
;
5581 dev
->gflags
^= IFF_PROMISC
;
5583 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
5584 if (dev
->flags
!= old_flags
)
5585 dev_set_rx_mode(dev
);
5588 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5589 is important. Some (broken) drivers set IFF_PROMISC, when
5590 IFF_ALLMULTI is requested not asking us and not reporting.
5592 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
5593 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
5595 dev
->gflags
^= IFF_ALLMULTI
;
5596 __dev_set_allmulti(dev
, inc
, false);
5602 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
5603 unsigned int gchanges
)
5605 unsigned int changes
= dev
->flags
^ old_flags
;
5608 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
5610 if (changes
& IFF_UP
) {
5611 if (dev
->flags
& IFF_UP
)
5612 call_netdevice_notifiers(NETDEV_UP
, dev
);
5614 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
5617 if (dev
->flags
& IFF_UP
&&
5618 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
5619 struct netdev_notifier_change_info change_info
;
5621 change_info
.flags_changed
= changes
;
5622 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
5628 * dev_change_flags - change device settings
5630 * @flags: device state flags
5632 * Change settings on device based state flags. The flags are
5633 * in the userspace exported format.
5635 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
5638 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
5640 ret
= __dev_change_flags(dev
, flags
);
5644 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
5645 __dev_notify_flags(dev
, old_flags
, changes
);
5648 EXPORT_SYMBOL(dev_change_flags
);
5650 static int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5652 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5654 if (ops
->ndo_change_mtu
)
5655 return ops
->ndo_change_mtu(dev
, new_mtu
);
5662 * dev_set_mtu - Change maximum transfer unit
5664 * @new_mtu: new transfer unit
5666 * Change the maximum transfer size of the network device.
5668 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
5672 if (new_mtu
== dev
->mtu
)
5675 /* MTU must be positive. */
5679 if (!netif_device_present(dev
))
5682 err
= call_netdevice_notifiers(NETDEV_PRECHANGEMTU
, dev
);
5683 err
= notifier_to_errno(err
);
5687 orig_mtu
= dev
->mtu
;
5688 err
= __dev_set_mtu(dev
, new_mtu
);
5691 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5692 err
= notifier_to_errno(err
);
5694 /* setting mtu back and notifying everyone again,
5695 * so that they have a chance to revert changes.
5697 __dev_set_mtu(dev
, orig_mtu
);
5698 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
5703 EXPORT_SYMBOL(dev_set_mtu
);
5706 * dev_set_group - Change group this device belongs to
5708 * @new_group: group this device should belong to
5710 void dev_set_group(struct net_device
*dev
, int new_group
)
5712 dev
->group
= new_group
;
5714 EXPORT_SYMBOL(dev_set_group
);
5717 * dev_set_mac_address - Change Media Access Control Address
5721 * Change the hardware (MAC) address of the device
5723 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
5725 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5728 if (!ops
->ndo_set_mac_address
)
5730 if (sa
->sa_family
!= dev
->type
)
5732 if (!netif_device_present(dev
))
5734 err
= ops
->ndo_set_mac_address(dev
, sa
);
5737 dev
->addr_assign_type
= NET_ADDR_SET
;
5738 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
5739 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5742 EXPORT_SYMBOL(dev_set_mac_address
);
5745 * dev_change_carrier - Change device carrier
5747 * @new_carrier: new value
5749 * Change device carrier
5751 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
5753 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5755 if (!ops
->ndo_change_carrier
)
5757 if (!netif_device_present(dev
))
5759 return ops
->ndo_change_carrier(dev
, new_carrier
);
5761 EXPORT_SYMBOL(dev_change_carrier
);
5764 * dev_get_phys_port_id - Get device physical port ID
5768 * Get device physical port ID
5770 int dev_get_phys_port_id(struct net_device
*dev
,
5771 struct netdev_phys_port_id
*ppid
)
5773 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5775 if (!ops
->ndo_get_phys_port_id
)
5777 return ops
->ndo_get_phys_port_id(dev
, ppid
);
5779 EXPORT_SYMBOL(dev_get_phys_port_id
);
5782 * dev_new_index - allocate an ifindex
5783 * @net: the applicable net namespace
5785 * Returns a suitable unique value for a new device interface
5786 * number. The caller must hold the rtnl semaphore or the
5787 * dev_base_lock to be sure it remains unique.
5789 static int dev_new_index(struct net
*net
)
5791 int ifindex
= net
->ifindex
;
5795 if (!__dev_get_by_index(net
, ifindex
))
5796 return net
->ifindex
= ifindex
;
5800 /* Delayed registration/unregisteration */
5801 static LIST_HEAD(net_todo_list
);
5802 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
5804 static void net_set_todo(struct net_device
*dev
)
5806 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5807 dev_net(dev
)->dev_unreg_count
++;
5810 static void rollback_registered_many(struct list_head
*head
)
5812 struct net_device
*dev
, *tmp
;
5813 LIST_HEAD(close_head
);
5815 BUG_ON(dev_boot_phase
);
5818 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5819 /* Some devices call without registering
5820 * for initialization unwind. Remove those
5821 * devices and proceed with the remaining.
5823 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5824 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5828 list_del(&dev
->unreg_list
);
5831 dev
->dismantle
= true;
5832 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
5835 /* If device is running, close it first. */
5836 list_for_each_entry(dev
, head
, unreg_list
)
5837 list_add_tail(&dev
->close_list
, &close_head
);
5838 dev_close_many(&close_head
);
5840 list_for_each_entry(dev
, head
, unreg_list
) {
5841 /* And unlink it from device chain. */
5842 unlist_netdevice(dev
);
5844 dev
->reg_state
= NETREG_UNREGISTERING
;
5849 list_for_each_entry(dev
, head
, unreg_list
) {
5850 /* Shutdown queueing discipline. */
5854 /* Notify protocols, that we are about to destroy
5855 this device. They should clean all the things.
5857 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5860 * Flush the unicast and multicast chains
5865 if (dev
->netdev_ops
->ndo_uninit
)
5866 dev
->netdev_ops
->ndo_uninit(dev
);
5868 if (!dev
->rtnl_link_ops
||
5869 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5870 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
5872 /* Notifier chain MUST detach us all upper devices. */
5873 WARN_ON(netdev_has_any_upper_dev(dev
));
5875 /* Remove entries from kobject tree */
5876 netdev_unregister_kobject(dev
);
5878 /* Remove XPS queueing entries */
5879 netif_reset_xps_queues_gt(dev
, 0);
5885 list_for_each_entry(dev
, head
, unreg_list
)
5889 static void rollback_registered(struct net_device
*dev
)
5893 list_add(&dev
->unreg_list
, &single
);
5894 rollback_registered_many(&single
);
5898 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5899 netdev_features_t features
)
5901 /* Fix illegal checksum combinations */
5902 if ((features
& NETIF_F_HW_CSUM
) &&
5903 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5904 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5905 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5908 /* TSO requires that SG is present as well. */
5909 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5910 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5911 features
&= ~NETIF_F_ALL_TSO
;
5914 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
5915 !(features
& NETIF_F_IP_CSUM
)) {
5916 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
5917 features
&= ~NETIF_F_TSO
;
5918 features
&= ~NETIF_F_TSO_ECN
;
5921 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
5922 !(features
& NETIF_F_IPV6_CSUM
)) {
5923 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
5924 features
&= ~NETIF_F_TSO6
;
5927 /* TSO ECN requires that TSO is present as well. */
5928 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5929 features
&= ~NETIF_F_TSO_ECN
;
5931 /* Software GSO depends on SG. */
5932 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5933 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5934 features
&= ~NETIF_F_GSO
;
5937 /* UFO needs SG and checksumming */
5938 if (features
& NETIF_F_UFO
) {
5939 /* maybe split UFO into V4 and V6? */
5940 if (!((features
& NETIF_F_GEN_CSUM
) ||
5941 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5942 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5944 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5945 features
&= ~NETIF_F_UFO
;
5948 if (!(features
& NETIF_F_SG
)) {
5950 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5951 features
&= ~NETIF_F_UFO
;
5955 #ifdef CONFIG_NET_RX_BUSY_POLL
5956 if (dev
->netdev_ops
->ndo_busy_poll
)
5957 features
|= NETIF_F_BUSY_POLL
;
5960 features
&= ~NETIF_F_BUSY_POLL
;
5965 int __netdev_update_features(struct net_device
*dev
)
5967 netdev_features_t features
;
5972 features
= netdev_get_wanted_features(dev
);
5974 if (dev
->netdev_ops
->ndo_fix_features
)
5975 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5977 /* driver might be less strict about feature dependencies */
5978 features
= netdev_fix_features(dev
, features
);
5980 if (dev
->features
== features
)
5983 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5984 &dev
->features
, &features
);
5986 if (dev
->netdev_ops
->ndo_set_features
)
5987 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5989 if (unlikely(err
< 0)) {
5991 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5992 err
, &features
, &dev
->features
);
5997 dev
->features
= features
;
6003 * netdev_update_features - recalculate device features
6004 * @dev: the device to check
6006 * Recalculate dev->features set and send notifications if it
6007 * has changed. Should be called after driver or hardware dependent
6008 * conditions might have changed that influence the features.
6010 void netdev_update_features(struct net_device
*dev
)
6012 if (__netdev_update_features(dev
))
6013 netdev_features_change(dev
);
6015 EXPORT_SYMBOL(netdev_update_features
);
6018 * netdev_change_features - recalculate device features
6019 * @dev: the device to check
6021 * Recalculate dev->features set and send notifications even
6022 * if they have not changed. Should be called instead of
6023 * netdev_update_features() if also dev->vlan_features might
6024 * have changed to allow the changes to be propagated to stacked
6027 void netdev_change_features(struct net_device
*dev
)
6029 __netdev_update_features(dev
);
6030 netdev_features_change(dev
);
6032 EXPORT_SYMBOL(netdev_change_features
);
6035 * netif_stacked_transfer_operstate - transfer operstate
6036 * @rootdev: the root or lower level device to transfer state from
6037 * @dev: the device to transfer operstate to
6039 * Transfer operational state from root to device. This is normally
6040 * called when a stacking relationship exists between the root
6041 * device and the device(a leaf device).
6043 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
6044 struct net_device
*dev
)
6046 if (rootdev
->operstate
== IF_OPER_DORMANT
)
6047 netif_dormant_on(dev
);
6049 netif_dormant_off(dev
);
6051 if (netif_carrier_ok(rootdev
)) {
6052 if (!netif_carrier_ok(dev
))
6053 netif_carrier_on(dev
);
6055 if (netif_carrier_ok(dev
))
6056 netif_carrier_off(dev
);
6059 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
6062 static int netif_alloc_rx_queues(struct net_device
*dev
)
6064 unsigned int i
, count
= dev
->num_rx_queues
;
6065 struct netdev_rx_queue
*rx
;
6069 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
6075 for (i
= 0; i
< count
; i
++)
6081 static void netdev_init_one_queue(struct net_device
*dev
,
6082 struct netdev_queue
*queue
, void *_unused
)
6084 /* Initialize queue lock */
6085 spin_lock_init(&queue
->_xmit_lock
);
6086 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
6087 queue
->xmit_lock_owner
= -1;
6088 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
6091 dql_init(&queue
->dql
, HZ
);
6095 static void netif_free_tx_queues(struct net_device
*dev
)
6100 static int netif_alloc_netdev_queues(struct net_device
*dev
)
6102 unsigned int count
= dev
->num_tx_queues
;
6103 struct netdev_queue
*tx
;
6104 size_t sz
= count
* sizeof(*tx
);
6106 BUG_ON(count
< 1 || count
> 0xffff);
6108 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6116 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
6117 spin_lock_init(&dev
->tx_global_lock
);
6123 * register_netdevice - register a network device
6124 * @dev: device to register
6126 * Take a completed network device structure and add it to the kernel
6127 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6128 * chain. 0 is returned on success. A negative errno code is returned
6129 * on a failure to set up the device, or if the name is a duplicate.
6131 * Callers must hold the rtnl semaphore. You may want
6132 * register_netdev() instead of this.
6135 * The locking appears insufficient to guarantee two parallel registers
6136 * will not get the same name.
6139 int register_netdevice(struct net_device
*dev
)
6142 struct net
*net
= dev_net(dev
);
6144 BUG_ON(dev_boot_phase
);
6149 /* When net_device's are persistent, this will be fatal. */
6150 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
6153 spin_lock_init(&dev
->addr_list_lock
);
6154 netdev_set_addr_lockdep_class(dev
);
6158 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
6162 /* Init, if this function is available */
6163 if (dev
->netdev_ops
->ndo_init
) {
6164 ret
= dev
->netdev_ops
->ndo_init(dev
);
6172 if (((dev
->hw_features
| dev
->features
) &
6173 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
6174 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
6175 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
6176 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
6183 dev
->ifindex
= dev_new_index(net
);
6184 else if (__dev_get_by_index(net
, dev
->ifindex
))
6187 if (dev
->iflink
== -1)
6188 dev
->iflink
= dev
->ifindex
;
6190 /* Transfer changeable features to wanted_features and enable
6191 * software offloads (GSO and GRO).
6193 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
6194 dev
->features
|= NETIF_F_SOFT_FEATURES
;
6195 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
6197 if (!(dev
->flags
& IFF_LOOPBACK
)) {
6198 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
6201 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6203 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
6205 /* Make NETIF_F_SG inheritable to tunnel devices.
6207 dev
->hw_enc_features
|= NETIF_F_SG
;
6209 /* Make NETIF_F_SG inheritable to MPLS.
6211 dev
->mpls_features
|= NETIF_F_SG
;
6213 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
6214 ret
= notifier_to_errno(ret
);
6218 ret
= netdev_register_kobject(dev
);
6221 dev
->reg_state
= NETREG_REGISTERED
;
6223 __netdev_update_features(dev
);
6226 * Default initial state at registry is that the
6227 * device is present.
6230 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6232 linkwatch_init_dev(dev
);
6234 dev_init_scheduler(dev
);
6236 list_netdevice(dev
);
6237 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6239 /* If the device has permanent device address, driver should
6240 * set dev_addr and also addr_assign_type should be set to
6241 * NET_ADDR_PERM (default value).
6243 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
6244 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
6246 /* Notify protocols, that a new device appeared. */
6247 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6248 ret
= notifier_to_errno(ret
);
6250 rollback_registered(dev
);
6251 dev
->reg_state
= NETREG_UNREGISTERED
;
6254 * Prevent userspace races by waiting until the network
6255 * device is fully setup before sending notifications.
6257 if (!dev
->rtnl_link_ops
||
6258 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6259 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6265 if (dev
->netdev_ops
->ndo_uninit
)
6266 dev
->netdev_ops
->ndo_uninit(dev
);
6269 EXPORT_SYMBOL(register_netdevice
);
6272 * init_dummy_netdev - init a dummy network device for NAPI
6273 * @dev: device to init
6275 * This takes a network device structure and initialize the minimum
6276 * amount of fields so it can be used to schedule NAPI polls without
6277 * registering a full blown interface. This is to be used by drivers
6278 * that need to tie several hardware interfaces to a single NAPI
6279 * poll scheduler due to HW limitations.
6281 int init_dummy_netdev(struct net_device
*dev
)
6283 /* Clear everything. Note we don't initialize spinlocks
6284 * are they aren't supposed to be taken by any of the
6285 * NAPI code and this dummy netdev is supposed to be
6286 * only ever used for NAPI polls
6288 memset(dev
, 0, sizeof(struct net_device
));
6290 /* make sure we BUG if trying to hit standard
6291 * register/unregister code path
6293 dev
->reg_state
= NETREG_DUMMY
;
6295 /* NAPI wants this */
6296 INIT_LIST_HEAD(&dev
->napi_list
);
6298 /* a dummy interface is started by default */
6299 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
6300 set_bit(__LINK_STATE_START
, &dev
->state
);
6302 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6303 * because users of this 'device' dont need to change
6309 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
6313 * register_netdev - register a network device
6314 * @dev: device to register
6316 * Take a completed network device structure and add it to the kernel
6317 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6318 * chain. 0 is returned on success. A negative errno code is returned
6319 * on a failure to set up the device, or if the name is a duplicate.
6321 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6322 * and expands the device name if you passed a format string to
6325 int register_netdev(struct net_device
*dev
)
6330 err
= register_netdevice(dev
);
6334 EXPORT_SYMBOL(register_netdev
);
6336 int netdev_refcnt_read(const struct net_device
*dev
)
6340 for_each_possible_cpu(i
)
6341 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
6344 EXPORT_SYMBOL(netdev_refcnt_read
);
6347 * netdev_wait_allrefs - wait until all references are gone.
6348 * @dev: target net_device
6350 * This is called when unregistering network devices.
6352 * Any protocol or device that holds a reference should register
6353 * for netdevice notification, and cleanup and put back the
6354 * reference if they receive an UNREGISTER event.
6355 * We can get stuck here if buggy protocols don't correctly
6358 static void netdev_wait_allrefs(struct net_device
*dev
)
6360 unsigned long rebroadcast_time
, warning_time
;
6363 linkwatch_forget_dev(dev
);
6365 rebroadcast_time
= warning_time
= jiffies
;
6366 refcnt
= netdev_refcnt_read(dev
);
6368 while (refcnt
!= 0) {
6369 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
6372 /* Rebroadcast unregister notification */
6373 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6379 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6380 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
6382 /* We must not have linkwatch events
6383 * pending on unregister. If this
6384 * happens, we simply run the queue
6385 * unscheduled, resulting in a noop
6388 linkwatch_run_queue();
6393 rebroadcast_time
= jiffies
;
6398 refcnt
= netdev_refcnt_read(dev
);
6400 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
6401 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6403 warning_time
= jiffies
;
6412 * register_netdevice(x1);
6413 * register_netdevice(x2);
6415 * unregister_netdevice(y1);
6416 * unregister_netdevice(y2);
6422 * We are invoked by rtnl_unlock().
6423 * This allows us to deal with problems:
6424 * 1) We can delete sysfs objects which invoke hotplug
6425 * without deadlocking with linkwatch via keventd.
6426 * 2) Since we run with the RTNL semaphore not held, we can sleep
6427 * safely in order to wait for the netdev refcnt to drop to zero.
6429 * We must not return until all unregister events added during
6430 * the interval the lock was held have been completed.
6432 void netdev_run_todo(void)
6434 struct list_head list
;
6436 /* Snapshot list, allow later requests */
6437 list_replace_init(&net_todo_list
, &list
);
6442 /* Wait for rcu callbacks to finish before next phase */
6443 if (!list_empty(&list
))
6446 while (!list_empty(&list
)) {
6447 struct net_device
*dev
6448 = list_first_entry(&list
, struct net_device
, todo_list
);
6449 list_del(&dev
->todo_list
);
6452 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6455 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
6456 pr_err("network todo '%s' but state %d\n",
6457 dev
->name
, dev
->reg_state
);
6462 dev
->reg_state
= NETREG_UNREGISTERED
;
6464 on_each_cpu(flush_backlog
, dev
, 1);
6466 netdev_wait_allrefs(dev
);
6469 BUG_ON(netdev_refcnt_read(dev
));
6470 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
6471 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
6472 WARN_ON(dev
->dn_ptr
);
6474 if (dev
->destructor
)
6475 dev
->destructor(dev
);
6477 /* Report a network device has been unregistered */
6479 dev_net(dev
)->dev_unreg_count
--;
6481 wake_up(&netdev_unregistering_wq
);
6483 /* Free network device */
6484 kobject_put(&dev
->dev
.kobj
);
6488 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6489 * fields in the same order, with only the type differing.
6491 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
6492 const struct net_device_stats
*netdev_stats
)
6494 #if BITS_PER_LONG == 64
6495 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
6496 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
6498 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
6499 const unsigned long *src
= (const unsigned long *)netdev_stats
;
6500 u64
*dst
= (u64
*)stats64
;
6502 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
6503 sizeof(*stats64
) / sizeof(u64
));
6504 for (i
= 0; i
< n
; i
++)
6508 EXPORT_SYMBOL(netdev_stats_to_stats64
);
6511 * dev_get_stats - get network device statistics
6512 * @dev: device to get statistics from
6513 * @storage: place to store stats
6515 * Get network statistics from device. Return @storage.
6516 * The device driver may provide its own method by setting
6517 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6518 * otherwise the internal statistics structure is used.
6520 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
6521 struct rtnl_link_stats64
*storage
)
6523 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6525 if (ops
->ndo_get_stats64
) {
6526 memset(storage
, 0, sizeof(*storage
));
6527 ops
->ndo_get_stats64(dev
, storage
);
6528 } else if (ops
->ndo_get_stats
) {
6529 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
6531 netdev_stats_to_stats64(storage
, &dev
->stats
);
6533 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
6534 storage
->tx_dropped
+= atomic_long_read(&dev
->tx_dropped
);
6537 EXPORT_SYMBOL(dev_get_stats
);
6539 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
6541 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
6543 #ifdef CONFIG_NET_CLS_ACT
6546 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
6549 netdev_init_one_queue(dev
, queue
, NULL
);
6550 queue
->qdisc
= &noop_qdisc
;
6551 queue
->qdisc_sleeping
= &noop_qdisc
;
6552 rcu_assign_pointer(dev
->ingress_queue
, queue
);
6557 static const struct ethtool_ops default_ethtool_ops
;
6559 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
6560 const struct ethtool_ops
*ops
)
6562 if (dev
->ethtool_ops
== &default_ethtool_ops
)
6563 dev
->ethtool_ops
= ops
;
6565 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
6567 void netdev_freemem(struct net_device
*dev
)
6569 char *addr
= (char *)dev
- dev
->padded
;
6575 * alloc_netdev_mqs - allocate network device
6576 * @sizeof_priv: size of private data to allocate space for
6577 * @name: device name format string
6578 * @name_assign_type: origin of device name
6579 * @setup: callback to initialize device
6580 * @txqs: the number of TX subqueues to allocate
6581 * @rxqs: the number of RX subqueues to allocate
6583 * Allocates a struct net_device with private data area for driver use
6584 * and performs basic initialization. Also allocates subqueue structs
6585 * for each queue on the device.
6587 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
6588 unsigned char name_assign_type
,
6589 void (*setup
)(struct net_device
*),
6590 unsigned int txqs
, unsigned int rxqs
)
6592 struct net_device
*dev
;
6594 struct net_device
*p
;
6596 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
6599 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6605 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6610 alloc_size
= sizeof(struct net_device
);
6612 /* ensure 32-byte alignment of private area */
6613 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
6614 alloc_size
+= sizeof_priv
;
6616 /* ensure 32-byte alignment of whole construct */
6617 alloc_size
+= NETDEV_ALIGN
- 1;
6619 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6621 p
= vzalloc(alloc_size
);
6625 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
6626 dev
->padded
= (char *)dev
- (char *)p
;
6628 dev
->pcpu_refcnt
= alloc_percpu(int);
6629 if (!dev
->pcpu_refcnt
)
6632 if (dev_addr_init(dev
))
6638 dev_net_set(dev
, &init_net
);
6640 dev
->gso_max_size
= GSO_MAX_SIZE
;
6641 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6643 INIT_LIST_HEAD(&dev
->napi_list
);
6644 INIT_LIST_HEAD(&dev
->unreg_list
);
6645 INIT_LIST_HEAD(&dev
->close_list
);
6646 INIT_LIST_HEAD(&dev
->link_watch_list
);
6647 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
6648 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
6649 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
6650 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
6651 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
6654 dev
->num_tx_queues
= txqs
;
6655 dev
->real_num_tx_queues
= txqs
;
6656 if (netif_alloc_netdev_queues(dev
))
6660 dev
->num_rx_queues
= rxqs
;
6661 dev
->real_num_rx_queues
= rxqs
;
6662 if (netif_alloc_rx_queues(dev
))
6666 strcpy(dev
->name
, name
);
6667 dev
->name_assign_type
= name_assign_type
;
6668 dev
->group
= INIT_NETDEV_GROUP
;
6669 if (!dev
->ethtool_ops
)
6670 dev
->ethtool_ops
= &default_ethtool_ops
;
6678 free_percpu(dev
->pcpu_refcnt
);
6680 netdev_freemem(dev
);
6683 EXPORT_SYMBOL(alloc_netdev_mqs
);
6686 * free_netdev - free network device
6689 * This function does the last stage of destroying an allocated device
6690 * interface. The reference to the device object is released.
6691 * If this is the last reference then it will be freed.
6693 void free_netdev(struct net_device
*dev
)
6695 struct napi_struct
*p
, *n
;
6697 release_net(dev_net(dev
));
6699 netif_free_tx_queues(dev
);
6704 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6706 /* Flush device addresses */
6707 dev_addr_flush(dev
);
6709 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6712 free_percpu(dev
->pcpu_refcnt
);
6713 dev
->pcpu_refcnt
= NULL
;
6715 /* Compatibility with error handling in drivers */
6716 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6717 netdev_freemem(dev
);
6721 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6722 dev
->reg_state
= NETREG_RELEASED
;
6724 /* will free via device release */
6725 put_device(&dev
->dev
);
6727 EXPORT_SYMBOL(free_netdev
);
6730 * synchronize_net - Synchronize with packet receive processing
6732 * Wait for packets currently being received to be done.
6733 * Does not block later packets from starting.
6735 void synchronize_net(void)
6738 if (rtnl_is_locked())
6739 synchronize_rcu_expedited();
6743 EXPORT_SYMBOL(synchronize_net
);
6746 * unregister_netdevice_queue - remove device from the kernel
6750 * This function shuts down a device interface and removes it
6751 * from the kernel tables.
6752 * If head not NULL, device is queued to be unregistered later.
6754 * Callers must hold the rtnl semaphore. You may want
6755 * unregister_netdev() instead of this.
6758 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6763 list_move_tail(&dev
->unreg_list
, head
);
6765 rollback_registered(dev
);
6766 /* Finish processing unregister after unlock */
6770 EXPORT_SYMBOL(unregister_netdevice_queue
);
6773 * unregister_netdevice_many - unregister many devices
6774 * @head: list of devices
6776 * Note: As most callers use a stack allocated list_head,
6777 * we force a list_del() to make sure stack wont be corrupted later.
6779 void unregister_netdevice_many(struct list_head
*head
)
6781 struct net_device
*dev
;
6783 if (!list_empty(head
)) {
6784 rollback_registered_many(head
);
6785 list_for_each_entry(dev
, head
, unreg_list
)
6790 EXPORT_SYMBOL(unregister_netdevice_many
);
6793 * unregister_netdev - remove device from the kernel
6796 * This function shuts down a device interface and removes it
6797 * from the kernel tables.
6799 * This is just a wrapper for unregister_netdevice that takes
6800 * the rtnl semaphore. In general you want to use this and not
6801 * unregister_netdevice.
6803 void unregister_netdev(struct net_device
*dev
)
6806 unregister_netdevice(dev
);
6809 EXPORT_SYMBOL(unregister_netdev
);
6812 * dev_change_net_namespace - move device to different nethost namespace
6814 * @net: network namespace
6815 * @pat: If not NULL name pattern to try if the current device name
6816 * is already taken in the destination network namespace.
6818 * This function shuts down a device interface and moves it
6819 * to a new network namespace. On success 0 is returned, on
6820 * a failure a netagive errno code is returned.
6822 * Callers must hold the rtnl semaphore.
6825 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
6831 /* Don't allow namespace local devices to be moved. */
6833 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6836 /* Ensure the device has been registrered */
6837 if (dev
->reg_state
!= NETREG_REGISTERED
)
6840 /* Get out if there is nothing todo */
6842 if (net_eq(dev_net(dev
), net
))
6845 /* Pick the destination device name, and ensure
6846 * we can use it in the destination network namespace.
6849 if (__dev_get_by_name(net
, dev
->name
)) {
6850 /* We get here if we can't use the current device name */
6853 if (dev_get_valid_name(net
, dev
, pat
) < 0)
6858 * And now a mini version of register_netdevice unregister_netdevice.
6861 /* If device is running close it first. */
6864 /* And unlink it from device chain */
6866 unlist_netdevice(dev
);
6870 /* Shutdown queueing discipline. */
6873 /* Notify protocols, that we are about to destroy
6874 this device. They should clean all the things.
6876 Note that dev->reg_state stays at NETREG_REGISTERED.
6877 This is wanted because this way 8021q and macvlan know
6878 the device is just moving and can keep their slaves up.
6880 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6882 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6883 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
6886 * Flush the unicast and multicast chains
6891 /* Send a netdev-removed uevent to the old namespace */
6892 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
6893 netdev_adjacent_del_links(dev
);
6895 /* Actually switch the network namespace */
6896 dev_net_set(dev
, net
);
6898 /* If there is an ifindex conflict assign a new one */
6899 if (__dev_get_by_index(net
, dev
->ifindex
)) {
6900 int iflink
= (dev
->iflink
== dev
->ifindex
);
6901 dev
->ifindex
= dev_new_index(net
);
6903 dev
->iflink
= dev
->ifindex
;
6906 /* Send a netdev-add uevent to the new namespace */
6907 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
6908 netdev_adjacent_add_links(dev
);
6910 /* Fixup kobjects */
6911 err
= device_rename(&dev
->dev
, dev
->name
);
6914 /* Add the device back in the hashes */
6915 list_netdevice(dev
);
6917 /* Notify protocols, that a new device appeared. */
6918 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6921 * Prevent userspace races by waiting until the network
6922 * device is fully setup before sending notifications.
6924 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
6931 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6933 static int dev_cpu_callback(struct notifier_block
*nfb
,
6934 unsigned long action
,
6937 struct sk_buff
**list_skb
;
6938 struct sk_buff
*skb
;
6939 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6940 struct softnet_data
*sd
, *oldsd
;
6942 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6945 local_irq_disable();
6946 cpu
= smp_processor_id();
6947 sd
= &per_cpu(softnet_data
, cpu
);
6948 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6950 /* Find end of our completion_queue. */
6951 list_skb
= &sd
->completion_queue
;
6953 list_skb
= &(*list_skb
)->next
;
6954 /* Append completion queue from offline CPU. */
6955 *list_skb
= oldsd
->completion_queue
;
6956 oldsd
->completion_queue
= NULL
;
6958 /* Append output queue from offline CPU. */
6959 if (oldsd
->output_queue
) {
6960 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6961 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6962 oldsd
->output_queue
= NULL
;
6963 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6965 /* Append NAPI poll list from offline CPU. */
6966 if (!list_empty(&oldsd
->poll_list
)) {
6967 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6968 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6971 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6974 /* Process offline CPU's input_pkt_queue */
6975 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6976 netif_rx_internal(skb
);
6977 input_queue_head_incr(oldsd
);
6979 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6980 netif_rx_internal(skb
);
6981 input_queue_head_incr(oldsd
);
6989 * netdev_increment_features - increment feature set by one
6990 * @all: current feature set
6991 * @one: new feature set
6992 * @mask: mask feature set
6994 * Computes a new feature set after adding a device with feature set
6995 * @one to the master device with current feature set @all. Will not
6996 * enable anything that is off in @mask. Returns the new feature set.
6998 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6999 netdev_features_t one
, netdev_features_t mask
)
7001 if (mask
& NETIF_F_GEN_CSUM
)
7002 mask
|= NETIF_F_ALL_CSUM
;
7003 mask
|= NETIF_F_VLAN_CHALLENGED
;
7005 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
7006 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
7008 /* If one device supports hw checksumming, set for all. */
7009 if (all
& NETIF_F_GEN_CSUM
)
7010 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
7014 EXPORT_SYMBOL(netdev_increment_features
);
7016 static struct hlist_head
* __net_init
netdev_create_hash(void)
7019 struct hlist_head
*hash
;
7021 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
7023 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
7024 INIT_HLIST_HEAD(&hash
[i
]);
7029 /* Initialize per network namespace state */
7030 static int __net_init
netdev_init(struct net
*net
)
7032 if (net
!= &init_net
)
7033 INIT_LIST_HEAD(&net
->dev_base_head
);
7035 net
->dev_name_head
= netdev_create_hash();
7036 if (net
->dev_name_head
== NULL
)
7039 net
->dev_index_head
= netdev_create_hash();
7040 if (net
->dev_index_head
== NULL
)
7046 kfree(net
->dev_name_head
);
7052 * netdev_drivername - network driver for the device
7053 * @dev: network device
7055 * Determine network driver for device.
7057 const char *netdev_drivername(const struct net_device
*dev
)
7059 const struct device_driver
*driver
;
7060 const struct device
*parent
;
7061 const char *empty
= "";
7063 parent
= dev
->dev
.parent
;
7067 driver
= parent
->driver
;
7068 if (driver
&& driver
->name
)
7069 return driver
->name
;
7073 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
7074 struct va_format
*vaf
)
7078 if (dev
&& dev
->dev
.parent
) {
7079 r
= dev_printk_emit(level
[1] - '0',
7082 dev_driver_string(dev
->dev
.parent
),
7083 dev_name(dev
->dev
.parent
),
7084 netdev_name(dev
), netdev_reg_state(dev
),
7087 r
= printk("%s%s%s: %pV", level
, netdev_name(dev
),
7088 netdev_reg_state(dev
), vaf
);
7090 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
7096 int netdev_printk(const char *level
, const struct net_device
*dev
,
7097 const char *format
, ...)
7099 struct va_format vaf
;
7103 va_start(args
, format
);
7108 r
= __netdev_printk(level
, dev
, &vaf
);
7114 EXPORT_SYMBOL(netdev_printk
);
7116 #define define_netdev_printk_level(func, level) \
7117 int func(const struct net_device *dev, const char *fmt, ...) \
7120 struct va_format vaf; \
7123 va_start(args, fmt); \
7128 r = __netdev_printk(level, dev, &vaf); \
7134 EXPORT_SYMBOL(func);
7136 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
7137 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
7138 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
7139 define_netdev_printk_level(netdev_err
, KERN_ERR
);
7140 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
7141 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
7142 define_netdev_printk_level(netdev_info
, KERN_INFO
);
7144 static void __net_exit
netdev_exit(struct net
*net
)
7146 kfree(net
->dev_name_head
);
7147 kfree(net
->dev_index_head
);
7150 static struct pernet_operations __net_initdata netdev_net_ops
= {
7151 .init
= netdev_init
,
7152 .exit
= netdev_exit
,
7155 static void __net_exit
default_device_exit(struct net
*net
)
7157 struct net_device
*dev
, *aux
;
7159 * Push all migratable network devices back to the
7160 * initial network namespace
7163 for_each_netdev_safe(net
, dev
, aux
) {
7165 char fb_name
[IFNAMSIZ
];
7167 /* Ignore unmoveable devices (i.e. loopback) */
7168 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7171 /* Leave virtual devices for the generic cleanup */
7172 if (dev
->rtnl_link_ops
)
7175 /* Push remaining network devices to init_net */
7176 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
7177 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
7179 pr_emerg("%s: failed to move %s to init_net: %d\n",
7180 __func__
, dev
->name
, err
);
7187 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
7189 /* Return with the rtnl_lock held when there are no network
7190 * devices unregistering in any network namespace in net_list.
7197 prepare_to_wait(&netdev_unregistering_wq
, &wait
,
7198 TASK_UNINTERRUPTIBLE
);
7199 unregistering
= false;
7201 list_for_each_entry(net
, net_list
, exit_list
) {
7202 if (net
->dev_unreg_count
> 0) {
7203 unregistering
= true;
7212 finish_wait(&netdev_unregistering_wq
, &wait
);
7215 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
7217 /* At exit all network devices most be removed from a network
7218 * namespace. Do this in the reverse order of registration.
7219 * Do this across as many network namespaces as possible to
7220 * improve batching efficiency.
7222 struct net_device
*dev
;
7224 LIST_HEAD(dev_kill_list
);
7226 /* To prevent network device cleanup code from dereferencing
7227 * loopback devices or network devices that have been freed
7228 * wait here for all pending unregistrations to complete,
7229 * before unregistring the loopback device and allowing the
7230 * network namespace be freed.
7232 * The netdev todo list containing all network devices
7233 * unregistrations that happen in default_device_exit_batch
7234 * will run in the rtnl_unlock() at the end of
7235 * default_device_exit_batch.
7237 rtnl_lock_unregistering(net_list
);
7238 list_for_each_entry(net
, net_list
, exit_list
) {
7239 for_each_netdev_reverse(net
, dev
) {
7240 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
)
7241 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
7243 unregister_netdevice_queue(dev
, &dev_kill_list
);
7246 unregister_netdevice_many(&dev_kill_list
);
7250 static struct pernet_operations __net_initdata default_device_ops
= {
7251 .exit
= default_device_exit
,
7252 .exit_batch
= default_device_exit_batch
,
7256 * Initialize the DEV module. At boot time this walks the device list and
7257 * unhooks any devices that fail to initialise (normally hardware not
7258 * present) and leaves us with a valid list of present and active devices.
7263 * This is called single threaded during boot, so no need
7264 * to take the rtnl semaphore.
7266 static int __init
net_dev_init(void)
7268 int i
, rc
= -ENOMEM
;
7270 BUG_ON(!dev_boot_phase
);
7272 if (dev_proc_init())
7275 if (netdev_kobject_init())
7278 INIT_LIST_HEAD(&ptype_all
);
7279 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
7280 INIT_LIST_HEAD(&ptype_base
[i
]);
7282 INIT_LIST_HEAD(&offload_base
);
7284 if (register_pernet_subsys(&netdev_net_ops
))
7288 * Initialise the packet receive queues.
7291 for_each_possible_cpu(i
) {
7292 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
7294 skb_queue_head_init(&sd
->input_pkt_queue
);
7295 skb_queue_head_init(&sd
->process_queue
);
7296 INIT_LIST_HEAD(&sd
->poll_list
);
7297 sd
->output_queue_tailp
= &sd
->output_queue
;
7299 sd
->csd
.func
= rps_trigger_softirq
;
7304 sd
->backlog
.poll
= process_backlog
;
7305 sd
->backlog
.weight
= weight_p
;
7310 /* The loopback device is special if any other network devices
7311 * is present in a network namespace the loopback device must
7312 * be present. Since we now dynamically allocate and free the
7313 * loopback device ensure this invariant is maintained by
7314 * keeping the loopback device as the first device on the
7315 * list of network devices. Ensuring the loopback devices
7316 * is the first device that appears and the last network device
7319 if (register_pernet_device(&loopback_net_ops
))
7322 if (register_pernet_device(&default_device_ops
))
7325 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
7326 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
7328 hotcpu_notifier(dev_cpu_callback
, 0);
7335 subsys_initcall(net_dev_init
);