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Merge branch 'docs-next' of git://git.lwn.net/linux-2.6
[linux-2.6/next.git] / include / linux / netdevice.h
blob812a5f3c2abe90da914e7c998b7b7d8e509b0e38
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the Interfaces handler.
7 *
8 * Version: @(#)dev.h 1.0.10 08/12/93
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Corey Minyard <wf-rch!minyard@relay.EU.net>
13 * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
14 * Alan Cox, <alan@lxorguk.ukuu.org.uk>
15 * Bjorn Ekwall. <bj0rn@blox.se>
16 * Pekka Riikonen <priikone@poseidon.pspt.fi>
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 *
23 * Moved to /usr/include/linux for NET3
24 */
25 #ifndef _LINUX_NETDEVICE_H
26 #define _LINUX_NETDEVICE_H
27
28 #include <linux/if.h>
29 #include <linux/if_ether.h>
30 #include <linux/if_packet.h>
31
32 #ifdef __KERNEL__
33 #include <linux/timer.h>
34 #include <linux/delay.h>
35 #include <linux/mm.h>
36 #include <asm/atomic.h>
37 #include <asm/cache.h>
38 #include <asm/byteorder.h>
39
40 #include <linux/device.h>
41 #include <linux/percpu.h>
42 #include <linux/rculist.h>
43 #include <linux/dmaengine.h>
44 #include <linux/workqueue.h>
45
46 #include <linux/ethtool.h>
47 #include <net/net_namespace.h>
48 #include <net/dsa.h>
49 #ifdef CONFIG_DCB
50 #include <net/dcbnl.h>
51 #endif
52
53 struct vlan_group;
54 struct netpoll_info;
55 /* 802.11 specific */
56 struct wireless_dev;
57 /* source back-compat hooks */
58 #define SET_ETHTOOL_OPS(netdev,ops) \
59 ( (netdev)->ethtool_ops = (ops) )
60
61 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
62 functions are available. */
63 #define HAVE_FREE_NETDEV /* free_netdev() */
64 #define HAVE_NETDEV_PRIV /* netdev_priv() */
65
66 #define NET_XMIT_SUCCESS 0
67 #define NET_XMIT_DROP 1 /* skb dropped */
68 #define NET_XMIT_CN 2 /* congestion notification */
69 #define NET_XMIT_POLICED 3 /* skb is shot by police */
70 #define NET_XMIT_MASK 0xFFFF /* qdisc flags in net/sch_generic.h */
71
72 /* Backlog congestion levels */
73 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
74 #define NET_RX_DROP 1 /* packet dropped */
75
76 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
77 * indicates that the device will soon be dropping packets, or already drops
78 * some packets of the same priority; prompting us to send less aggressively. */
79 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e))
80 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
81
82 /* Driver transmit return codes */
83 enum netdev_tx {
84 NETDEV_TX_OK = 0, /* driver took care of packet */
85 NETDEV_TX_BUSY, /* driver tx path was busy*/
86 NETDEV_TX_LOCKED = -1, /* driver tx lock was already taken */
87 };
88 typedef enum netdev_tx netdev_tx_t;
89
90 #endif
91
92 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
93
94 #ifdef __KERNEL__
95 /*
96 * Compute the worst case header length according to the protocols
97 * used.
98 */
99
100 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
101 # if defined(CONFIG_MAC80211_MESH)
102 # define LL_MAX_HEADER 128
103 # else
104 # define LL_MAX_HEADER 96
105 # endif
106 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
107 # define LL_MAX_HEADER 48
108 #else
109 # define LL_MAX_HEADER 32
110 #endif
111
112 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
113 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
114 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
115 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
116 #define MAX_HEADER LL_MAX_HEADER
117 #else
118 #define MAX_HEADER (LL_MAX_HEADER + 48)
119 #endif
120
121 #endif /* __KERNEL__ */
122
123 /*
124 * Network device statistics. Akin to the 2.0 ether stats but
125 * with byte counters.
126 */
127
128 struct net_device_stats
129 {
130 unsigned long rx_packets; /* total packets received */
131 unsigned long tx_packets; /* total packets transmitted */
132 unsigned long rx_bytes; /* total bytes received */
133 unsigned long tx_bytes; /* total bytes transmitted */
134 unsigned long rx_errors; /* bad packets received */
135 unsigned long tx_errors; /* packet transmit problems */
136 unsigned long rx_dropped; /* no space in linux buffers */
137 unsigned long tx_dropped; /* no space available in linux */
138 unsigned long multicast; /* multicast packets received */
139 unsigned long collisions;
140
141 /* detailed rx_errors: */
142 unsigned long rx_length_errors;
143 unsigned long rx_over_errors; /* receiver ring buff overflow */
144 unsigned long rx_crc_errors; /* recved pkt with crc error */
145 unsigned long rx_frame_errors; /* recv'd frame alignment error */
146 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
147 unsigned long rx_missed_errors; /* receiver missed packet */
148
149 /* detailed tx_errors */
150 unsigned long tx_aborted_errors;
151 unsigned long tx_carrier_errors;
152 unsigned long tx_fifo_errors;
153 unsigned long tx_heartbeat_errors;
154 unsigned long tx_window_errors;
155
156 /* for cslip etc */
157 unsigned long rx_compressed;
158 unsigned long tx_compressed;
159 };
160
161
162 /* Media selection options. */
163 enum {
164 IF_PORT_UNKNOWN = 0,
165 IF_PORT_10BASE2,
166 IF_PORT_10BASET,
167 IF_PORT_AUI,
168 IF_PORT_100BASET,
169 IF_PORT_100BASETX,
170 IF_PORT_100BASEFX
171 };
172
173 #ifdef __KERNEL__
174
175 #include <linux/cache.h>
176 #include <linux/skbuff.h>
177
178 struct neighbour;
179 struct neigh_parms;
180 struct sk_buff;
181
182 struct netif_rx_stats
183 {
184 unsigned total;
185 unsigned dropped;
186 unsigned time_squeeze;
187 unsigned cpu_collision;
188 };
189
190 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
191
192 struct dev_addr_list
193 {
194 struct dev_addr_list *next;
195 u8 da_addr[MAX_ADDR_LEN];
196 u8 da_addrlen;
197 u8 da_synced;
198 int da_users;
199 int da_gusers;
200 };
201
202 /*
203 * We tag multicasts with these structures.
204 */
205
206 #define dev_mc_list dev_addr_list
207 #define dmi_addr da_addr
208 #define dmi_addrlen da_addrlen
209 #define dmi_users da_users
210 #define dmi_gusers da_gusers
211
212 struct netdev_hw_addr {
213 struct list_head list;
214 unsigned char addr[MAX_ADDR_LEN];
215 unsigned char type;
216 #define NETDEV_HW_ADDR_T_LAN 1
217 #define NETDEV_HW_ADDR_T_SAN 2
218 #define NETDEV_HW_ADDR_T_SLAVE 3
219 #define NETDEV_HW_ADDR_T_UNICAST 4
220 int refcount;
221 bool synced;
222 struct rcu_head rcu_head;
223 };
224
225 struct netdev_hw_addr_list {
226 struct list_head list;
227 int count;
228 };
229
230 struct hh_cache
231 {
232 struct hh_cache *hh_next; /* Next entry */
233 atomic_t hh_refcnt; /* number of users */
234 /*
235 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
236 * cache line on SMP.
237 * They are mostly read, but hh_refcnt may be changed quite frequently,
238 * incurring cache line ping pongs.
239 */
240 __be16 hh_type ____cacheline_aligned_in_smp;
241 /* protocol identifier, f.e ETH_P_IP
242 * NOTE: For VLANs, this will be the
243 * encapuslated type. --BLG
244 */
245 u16 hh_len; /* length of header */
246 int (*hh_output)(struct sk_buff *skb);
247 seqlock_t hh_lock;
248
249 /* cached hardware header; allow for machine alignment needs. */
250 #define HH_DATA_MOD 16
251 #define HH_DATA_OFF(__len) \
252 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
253 #define HH_DATA_ALIGN(__len) \
254 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
255 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
256 };
257
258 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
259 * Alternative is:
260 * dev->hard_header_len ? (dev->hard_header_len +
261 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
262 *
263 * We could use other alignment values, but we must maintain the
264 * relationship HH alignment <= LL alignment.
265 *
266 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
267 * may need.
268 */
269 #define LL_RESERVED_SPACE(dev) \
270 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
271 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
272 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
273 #define LL_ALLOCATED_SPACE(dev) \
274 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
275
276 struct header_ops {
277 int (*create) (struct sk_buff *skb, struct net_device *dev,
278 unsigned short type, const void *daddr,
279 const void *saddr, unsigned len);
280 int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
281 int (*rebuild)(struct sk_buff *skb);
282 #define HAVE_HEADER_CACHE
283 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
284 void (*cache_update)(struct hh_cache *hh,
285 const struct net_device *dev,
286 const unsigned char *haddr);
287 };
288
289 /* These flag bits are private to the generic network queueing
290 * layer, they may not be explicitly referenced by any other
291 * code.
292 */
293
294 enum netdev_state_t
295 {
296 __LINK_STATE_START,
297 __LINK_STATE_PRESENT,
298 __LINK_STATE_NOCARRIER,
299 __LINK_STATE_LINKWATCH_PENDING,
300 __LINK_STATE_DORMANT,
301 };
302
303
304 /*
305 * This structure holds at boot time configured netdevice settings. They
306 * are then used in the device probing.
307 */
308 struct netdev_boot_setup {
309 char name[IFNAMSIZ];
310 struct ifmap map;
311 };
312 #define NETDEV_BOOT_SETUP_MAX 8
313
314 extern int __init netdev_boot_setup(char *str);
315
316 /*
317 * Structure for NAPI scheduling similar to tasklet but with weighting
318 */
319 struct napi_struct {
320 /* The poll_list must only be managed by the entity which
321 * changes the state of the NAPI_STATE_SCHED bit. This means
322 * whoever atomically sets that bit can add this napi_struct
323 * to the per-cpu poll_list, and whoever clears that bit
324 * can remove from the list right before clearing the bit.
325 */
326 struct list_head poll_list;
327
328 unsigned long state;
329 int weight;
330 int (*poll)(struct napi_struct *, int);
331 #ifdef CONFIG_NETPOLL
332 spinlock_t poll_lock;
333 int poll_owner;
334 #endif
335
336 unsigned int gro_count;
337
338 struct net_device *dev;
339 struct list_head dev_list;
340 struct sk_buff *gro_list;
341 struct sk_buff *skb;
342 };
343
344 enum
345 {
346 NAPI_STATE_SCHED, /* Poll is scheduled */
347 NAPI_STATE_DISABLE, /* Disable pending */
348 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */
349 };
350
351 enum {
352 GRO_MERGED,
353 GRO_MERGED_FREE,
354 GRO_HELD,
355 GRO_NORMAL,
356 GRO_DROP,
357 };
358
359 extern void __napi_schedule(struct napi_struct *n);
360
361 static inline int napi_disable_pending(struct napi_struct *n)
362 {
363 return test_bit(NAPI_STATE_DISABLE, &n->state);
364 }
365
366 /**
367 * napi_schedule_prep - check if napi can be scheduled
368 * @n: napi context
369 *
370 * Test if NAPI routine is already running, and if not mark
371 * it as running. This is used as a condition variable
372 * insure only one NAPI poll instance runs. We also make
373 * sure there is no pending NAPI disable.
374 */
375 static inline int napi_schedule_prep(struct napi_struct *n)
376 {
377 return !napi_disable_pending(n) &&
378 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
379 }
380
381 /**
382 * napi_schedule - schedule NAPI poll
383 * @n: napi context
384 *
385 * Schedule NAPI poll routine to be called if it is not already
386 * running.
387 */
388 static inline void napi_schedule(struct napi_struct *n)
389 {
390 if (napi_schedule_prep(n))
391 __napi_schedule(n);
392 }
393
394 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
395 static inline int napi_reschedule(struct napi_struct *napi)
396 {
397 if (napi_schedule_prep(napi)) {
398 __napi_schedule(napi);
399 return 1;
400 }
401 return 0;
402 }
403
404 /**
405 * napi_complete - NAPI processing complete
406 * @n: napi context
407 *
408 * Mark NAPI processing as complete.
409 */
410 extern void __napi_complete(struct napi_struct *n);
411 extern void napi_complete(struct napi_struct *n);
412
413 /**
414 * napi_disable - prevent NAPI from scheduling
415 * @n: napi context
416 *
417 * Stop NAPI from being scheduled on this context.
418 * Waits till any outstanding processing completes.
419 */
420 static inline void napi_disable(struct napi_struct *n)
421 {
422 set_bit(NAPI_STATE_DISABLE, &n->state);
423 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
424 msleep(1);
425 clear_bit(NAPI_STATE_DISABLE, &n->state);
426 }
427
428 /**
429 * napi_enable - enable NAPI scheduling
430 * @n: napi context
431 *
432 * Resume NAPI from being scheduled on this context.
433 * Must be paired with napi_disable.
434 */
435 static inline void napi_enable(struct napi_struct *n)
436 {
437 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
438 smp_mb__before_clear_bit();
439 clear_bit(NAPI_STATE_SCHED, &n->state);
440 }
441
442 #ifdef CONFIG_SMP
443 /**
444 * napi_synchronize - wait until NAPI is not running
445 * @n: napi context
446 *
447 * Wait until NAPI is done being scheduled on this context.
448 * Waits till any outstanding processing completes but
449 * does not disable future activations.
450 */
451 static inline void napi_synchronize(const struct napi_struct *n)
452 {
453 while (test_bit(NAPI_STATE_SCHED, &n->state))
454 msleep(1);
455 }
456 #else
457 # define napi_synchronize(n) barrier()
458 #endif
459
460 enum netdev_queue_state_t
461 {
462 __QUEUE_STATE_XOFF,
463 __QUEUE_STATE_FROZEN,
464 };
465
466 struct netdev_queue {
467 /*
468 * read mostly part
469 */
470 struct net_device *dev;
471 struct Qdisc *qdisc;
472 unsigned long state;
473 struct Qdisc *qdisc_sleeping;
474 /*
475 * write mostly part
476 */
477 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
478 int xmit_lock_owner;
479 /*
480 * please use this field instead of dev->trans_start
481 */
482 unsigned long trans_start;
483 unsigned long tx_bytes;
484 unsigned long tx_packets;
485 unsigned long tx_dropped;
486 } ____cacheline_aligned_in_smp;
487
488
489 /*
490 * This structure defines the management hooks for network devices.
491 * The following hooks can be defined; unless noted otherwise, they are
492 * optional and can be filled with a null pointer.
493 *
494 * int (*ndo_init)(struct net_device *dev);
495 * This function is called once when network device is registered.
496 * The network device can use this to any late stage initializaton
497 * or semantic validattion. It can fail with an error code which will
498 * be propogated back to register_netdev
499 *
500 * void (*ndo_uninit)(struct net_device *dev);
501 * This function is called when device is unregistered or when registration
502 * fails. It is not called if init fails.
503 *
504 * int (*ndo_open)(struct net_device *dev);
505 * This function is called when network device transistions to the up
506 * state.
507 *
508 * int (*ndo_stop)(struct net_device *dev);
509 * This function is called when network device transistions to the down
510 * state.
511 *
512 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
513 * struct net_device *dev);
514 * Called when a packet needs to be transmitted.
515 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
516 * (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
517 * Required can not be NULL.
518 *
519 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
520 * Called to decide which queue to when device supports multiple
521 * transmit queues.
522 *
523 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
524 * This function is called to allow device receiver to make
525 * changes to configuration when multicast or promiscious is enabled.
526 *
527 * void (*ndo_set_rx_mode)(struct net_device *dev);
528 * This function is called device changes address list filtering.
529 *
530 * void (*ndo_set_multicast_list)(struct net_device *dev);
531 * This function is called when the multicast address list changes.
532 *
533 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
534 * This function is called when the Media Access Control address
535 * needs to be changed. If this interface is not defined, the
536 * mac address can not be changed.
537 *
538 * int (*ndo_validate_addr)(struct net_device *dev);
539 * Test if Media Access Control address is valid for the device.
540 *
541 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
542 * Called when a user request an ioctl which can't be handled by
543 * the generic interface code. If not defined ioctl's return
544 * not supported error code.
545 *
546 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
547 * Used to set network devices bus interface parameters. This interface
548 * is retained for legacy reason, new devices should use the bus
549 * interface (PCI) for low level management.
550 *
551 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
552 * Called when a user wants to change the Maximum Transfer Unit
553 * of a device. If not defined, any request to change MTU will
554 * will return an error.
555 *
556 * void (*ndo_tx_timeout)(struct net_device *dev);
557 * Callback uses when the transmitter has not made any progress
558 * for dev->watchdog ticks.
559 *
560 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
561 * Called when a user wants to get the network device usage
562 * statistics. If not defined, the counters in dev->stats will
563 * be used.
564 *
565 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
566 * If device support VLAN receive accleration
567 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
568 * when vlan groups for the device changes. Note: grp is NULL
569 * if no vlan's groups are being used.
570 *
571 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
572 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
573 * this function is called when a VLAN id is registered.
574 *
575 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
576 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
577 * this function is called when a VLAN id is unregistered.
578 *
579 * void (*ndo_poll_controller)(struct net_device *dev);
580 */
581 #define HAVE_NET_DEVICE_OPS
582 struct net_device_ops {
583 int (*ndo_init)(struct net_device *dev);
584 void (*ndo_uninit)(struct net_device *dev);
585 int (*ndo_open)(struct net_device *dev);
586 int (*ndo_stop)(struct net_device *dev);
587 netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb,
588 struct net_device *dev);
589 u16 (*ndo_select_queue)(struct net_device *dev,
590 struct sk_buff *skb);
591 #define HAVE_CHANGE_RX_FLAGS
592 void (*ndo_change_rx_flags)(struct net_device *dev,
593 int flags);
594 #define HAVE_SET_RX_MODE
595 void (*ndo_set_rx_mode)(struct net_device *dev);
596 #define HAVE_MULTICAST
597 void (*ndo_set_multicast_list)(struct net_device *dev);
598 #define HAVE_SET_MAC_ADDR
599 int (*ndo_set_mac_address)(struct net_device *dev,
600 void *addr);
601 #define HAVE_VALIDATE_ADDR
602 int (*ndo_validate_addr)(struct net_device *dev);
603 #define HAVE_PRIVATE_IOCTL
604 int (*ndo_do_ioctl)(struct net_device *dev,
605 struct ifreq *ifr, int cmd);
606 #define HAVE_SET_CONFIG
607 int (*ndo_set_config)(struct net_device *dev,
608 struct ifmap *map);
609 #define HAVE_CHANGE_MTU
610 int (*ndo_change_mtu)(struct net_device *dev,
611 int new_mtu);
612 int (*ndo_neigh_setup)(struct net_device *dev,
613 struct neigh_parms *);
614 #define HAVE_TX_TIMEOUT
615 void (*ndo_tx_timeout) (struct net_device *dev);
616
617 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
618
619 void (*ndo_vlan_rx_register)(struct net_device *dev,
620 struct vlan_group *grp);
621 void (*ndo_vlan_rx_add_vid)(struct net_device *dev,
622 unsigned short vid);
623 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
624 unsigned short vid);
625 #ifdef CONFIG_NET_POLL_CONTROLLER
626 #define HAVE_NETDEV_POLL
627 void (*ndo_poll_controller)(struct net_device *dev);
628 #endif
629 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
630 int (*ndo_fcoe_enable)(struct net_device *dev);
631 int (*ndo_fcoe_disable)(struct net_device *dev);
632 int (*ndo_fcoe_ddp_setup)(struct net_device *dev,
633 u16 xid,
634 struct scatterlist *sgl,
635 unsigned int sgc);
636 int (*ndo_fcoe_ddp_done)(struct net_device *dev,
637 u16 xid);
638 #endif
639 };
640
641 /*
642 * The DEVICE structure.
643 * Actually, this whole structure is a big mistake. It mixes I/O
644 * data with strictly "high-level" data, and it has to know about
645 * almost every data structure used in the INET module.
646 *
647 * FIXME: cleanup struct net_device such that network protocol info
648 * moves out.
649 */
650
651 struct net_device
652 {
653
654 /*
655 * This is the first field of the "visible" part of this structure
656 * (i.e. as seen by users in the "Space.c" file). It is the name
657 * the interface.
658 */
659 char name[IFNAMSIZ];
660 /* device name hash chain */
661 struct hlist_node name_hlist;
662 /* snmp alias */
663 char *ifalias;
664
665 /*
666 * I/O specific fields
667 * FIXME: Merge these and struct ifmap into one
668 */
669 unsigned long mem_end; /* shared mem end */
670 unsigned long mem_start; /* shared mem start */
671 unsigned long base_addr; /* device I/O address */
672 unsigned int irq; /* device IRQ number */
673
674 /*
675 * Some hardware also needs these fields, but they are not
676 * part of the usual set specified in Space.c.
677 */
678
679 unsigned char if_port; /* Selectable AUI, TP,..*/
680 unsigned char dma; /* DMA channel */
681
682 unsigned long state;
683
684 struct list_head dev_list;
685 struct list_head napi_list;
686
687 /* Net device features */
688 unsigned long features;
689 #define NETIF_F_SG 1 /* Scatter/gather IO. */
690 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
691 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
692 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
693 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
694 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
695 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
696 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
697 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
698 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
699 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
700 #define NETIF_F_GSO 2048 /* Enable software GSO. */
701 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */
702 /* do not use LLTX in new drivers */
703 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
704 #define NETIF_F_GRO 16384 /* Generic receive offload */
705 #define NETIF_F_LRO 32768 /* large receive offload */
706
707 /* the GSO_MASK reserves bits 16 through 23 */
708 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */
709 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */
710 #define NETIF_F_FCOE_MTU (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
711
712 /* Segmentation offload features */
713 #define NETIF_F_GSO_SHIFT 16
714 #define NETIF_F_GSO_MASK 0x00ff0000
715 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
716 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
717 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
718 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
719 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
720 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
721
722 /* List of features with software fallbacks. */
723 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
724
725
726 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
727 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
728 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
729 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
730
731 /*
732 * If one device supports one of these features, then enable them
733 * for all in netdev_increment_features.
734 */
735 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
736 NETIF_F_SG | NETIF_F_HIGHDMA | \
737 NETIF_F_FRAGLIST)
738
739 /* Interface index. Unique device identifier */
740 int ifindex;
741 int iflink;
742
743 struct net_device_stats stats;
744
745 #ifdef CONFIG_WIRELESS_EXT
746 /* List of functions to handle Wireless Extensions (instead of ioctl).
747 * See <net/iw_handler.h> for details. Jean II */
748 const struct iw_handler_def * wireless_handlers;
749 /* Instance data managed by the core of Wireless Extensions. */
750 struct iw_public_data * wireless_data;
751 #endif
752 /* Management operations */
753 const struct net_device_ops *netdev_ops;
754 const struct ethtool_ops *ethtool_ops;
755
756 /* Hardware header description */
757 const struct header_ops *header_ops;
758
759 unsigned int flags; /* interface flags (a la BSD) */
760 unsigned short gflags;
761 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
762 unsigned short padded; /* How much padding added by alloc_netdev() */
763
764 unsigned char operstate; /* RFC2863 operstate */
765 unsigned char link_mode; /* mapping policy to operstate */
766
767 unsigned mtu; /* interface MTU value */
768 unsigned short type; /* interface hardware type */
769 unsigned short hard_header_len; /* hardware hdr length */
770
771 /* extra head- and tailroom the hardware may need, but not in all cases
772 * can this be guaranteed, especially tailroom. Some cases also use
773 * LL_MAX_HEADER instead to allocate the skb.
774 */
775 unsigned short needed_headroom;
776 unsigned short needed_tailroom;
777
778 struct net_device *master; /* Pointer to master device of a group,
779 * which this device is member of.
780 */
781
782 /* Interface address info. */
783 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
784 unsigned char addr_len; /* hardware address length */
785 unsigned short dev_id; /* for shared network cards */
786
787 struct netdev_hw_addr_list uc; /* Secondary unicast
788 mac addresses */
789 int uc_promisc;
790 spinlock_t addr_list_lock;
791 struct dev_addr_list *mc_list; /* Multicast mac addresses */
792 int mc_count; /* Number of installed mcasts */
793 unsigned int promiscuity;
794 unsigned int allmulti;
795
796
797 /* Protocol specific pointers */
798
799 #ifdef CONFIG_NET_DSA
800 void *dsa_ptr; /* dsa specific data */
801 #endif
802 void *atalk_ptr; /* AppleTalk link */
803 void *ip_ptr; /* IPv4 specific data */
804 void *dn_ptr; /* DECnet specific data */
805 void *ip6_ptr; /* IPv6 specific data */
806 void *ec_ptr; /* Econet specific data */
807 void *ax25_ptr; /* AX.25 specific data */
808 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
809 assign before registering */
810
811 /*
812 * Cache line mostly used on receive path (including eth_type_trans())
813 */
814 unsigned long last_rx; /* Time of last Rx */
815 /* Interface address info used in eth_type_trans() */
816 unsigned char *dev_addr; /* hw address, (before bcast
817 because most packets are
818 unicast) */
819
820 struct netdev_hw_addr_list dev_addrs; /* list of device
821 hw addresses */
822
823 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
824
825 struct netdev_queue rx_queue;
826
827 struct netdev_queue *_tx ____cacheline_aligned_in_smp;
828
829 /* Number of TX queues allocated at alloc_netdev_mq() time */
830 unsigned int num_tx_queues;
831
832 /* Number of TX queues currently active in device */
833 unsigned int real_num_tx_queues;
834
835 /* root qdisc from userspace point of view */
836 struct Qdisc *qdisc;
837
838 unsigned long tx_queue_len; /* Max frames per queue allowed */
839 spinlock_t tx_global_lock;
840 /*
841 * One part is mostly used on xmit path (device)
842 */
843 /* These may be needed for future network-power-down code. */
844
845 /*
846 * trans_start here is expensive for high speed devices on SMP,
847 * please use netdev_queue->trans_start instead.
848 */
849 unsigned long trans_start; /* Time (in jiffies) of last Tx */
850
851 int watchdog_timeo; /* used by dev_watchdog() */
852 struct timer_list watchdog_timer;
853
854 /* Number of references to this device */
855 atomic_t refcnt ____cacheline_aligned_in_smp;
856
857 /* delayed register/unregister */
858 struct list_head todo_list;
859 /* device index hash chain */
860 struct hlist_node index_hlist;
861
862 struct net_device *link_watch_next;
863
864 /* register/unregister state machine */
865 enum { NETREG_UNINITIALIZED=0,
866 NETREG_REGISTERED, /* completed register_netdevice */
867 NETREG_UNREGISTERING, /* called unregister_netdevice */
868 NETREG_UNREGISTERED, /* completed unregister todo */
869 NETREG_RELEASED, /* called free_netdev */
870 NETREG_DUMMY, /* dummy device for NAPI poll */
871 } reg_state;
872
873 /* Called from unregister, can be used to call free_netdev */
874 void (*destructor)(struct net_device *dev);
875
876 #ifdef CONFIG_NETPOLL
877 struct netpoll_info *npinfo;
878 #endif
879
880 #ifdef CONFIG_NET_NS
881 /* Network namespace this network device is inside */
882 struct net *nd_net;
883 #endif
884
885 /* mid-layer private */
886 void *ml_priv;
887
888 /* bridge stuff */
889 struct net_bridge_port *br_port;
890 /* macvlan */
891 struct macvlan_port *macvlan_port;
892 /* GARP */
893 struct garp_port *garp_port;
894
895 /* class/net/name entry */
896 struct device dev;
897 /* space for optional statistics and wireless sysfs groups */
898 const struct attribute_group *sysfs_groups[3];
899
900 /* rtnetlink link ops */
901 const struct rtnl_link_ops *rtnl_link_ops;
902
903 /* VLAN feature mask */
904 unsigned long vlan_features;
905
906 /* for setting kernel sock attribute on TCP connection setup */
907 #define GSO_MAX_SIZE 65536
908 unsigned int gso_max_size;
909
910 #ifdef CONFIG_DCB
911 /* Data Center Bridging netlink ops */
912 struct dcbnl_rtnl_ops *dcbnl_ops;
913 #endif
914
915 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
916 /* max exchange id for FCoE LRO by ddp */
917 unsigned int fcoe_ddp_xid;
918 #endif
919 };
920 #define to_net_dev(d) container_of(d, struct net_device, dev)
921
922 #define NETDEV_ALIGN 32
923
924 static inline
925 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
926 unsigned int index)
927 {
928 return &dev->_tx[index];
929 }
930
931 static inline void netdev_for_each_tx_queue(struct net_device *dev,
932 void (*f)(struct net_device *,
933 struct netdev_queue *,
934 void *),
935 void *arg)
936 {
937 unsigned int i;
938
939 for (i = 0; i < dev->num_tx_queues; i++)
940 f(dev, &dev->_tx[i], arg);
941 }
942
943 /*
944 * Net namespace inlines
945 */
946 static inline
947 struct net *dev_net(const struct net_device *dev)
948 {
949 #ifdef CONFIG_NET_NS
950 return dev->nd_net;
951 #else
952 return &init_net;
953 #endif
954 }
955
956 static inline
957 void dev_net_set(struct net_device *dev, struct net *net)
958 {
959 #ifdef CONFIG_NET_NS
960 release_net(dev->nd_net);
961 dev->nd_net = hold_net(net);
962 #endif
963 }
964
965 static inline bool netdev_uses_dsa_tags(struct net_device *dev)
966 {
967 #ifdef CONFIG_NET_DSA_TAG_DSA
968 if (dev->dsa_ptr != NULL)
969 return dsa_uses_dsa_tags(dev->dsa_ptr);
970 #endif
971
972 return 0;
973 }
974
975 static inline bool netdev_uses_trailer_tags(struct net_device *dev)
976 {
977 #ifdef CONFIG_NET_DSA_TAG_TRAILER
978 if (dev->dsa_ptr != NULL)
979 return dsa_uses_trailer_tags(dev->dsa_ptr);
980 #endif
981
982 return 0;
983 }
984
985 /**
986 * netdev_priv - access network device private data
987 * @dev: network device
988 *
989 * Get network device private data
990 */
991 static inline void *netdev_priv(const struct net_device *dev)
992 {
993 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
994 }
995
996 /* Set the sysfs physical device reference for the network logical device
997 * if set prior to registration will cause a symlink during initialization.
998 */
999 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
1000
1001 /* Set the sysfs device type for the network logical device to allow
1002 * fin grained indentification of different network device types. For
1003 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1004 */
1005 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype))
1006
1007 /**
1008 * netif_napi_add - initialize a napi context
1009 * @dev: network device
1010 * @napi: napi context
1011 * @poll: polling function
1012 * @weight: default weight
1013 *
1014 * netif_napi_add() must be used to initialize a napi context prior to calling
1015 * *any* of the other napi related functions.
1016 */
1017 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1018 int (*poll)(struct napi_struct *, int), int weight);
1019
1020 /**
1021 * netif_napi_del - remove a napi context
1022 * @napi: napi context
1023 *
1024 * netif_napi_del() removes a napi context from the network device napi list
1025 */
1026 void netif_napi_del(struct napi_struct *napi);
1027
1028 struct napi_gro_cb {
1029 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1030 void *frag0;
1031
1032 /* Length of frag0. */
1033 unsigned int frag0_len;
1034
1035 /* This indicates where we are processing relative to skb->data. */
1036 int data_offset;
1037
1038 /* This is non-zero if the packet may be of the same flow. */
1039 int same_flow;
1040
1041 /* This is non-zero if the packet cannot be merged with the new skb. */
1042 int flush;
1043
1044 /* Number of segments aggregated. */
1045 int count;
1046
1047 /* Free the skb? */
1048 int free;
1049 };
1050
1051 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1052
1053 struct packet_type {
1054 __be16 type; /* This is really htons(ether_type). */
1055 struct net_device *dev; /* NULL is wildcarded here */
1056 int (*func) (struct sk_buff *,
1057 struct net_device *,
1058 struct packet_type *,
1059 struct net_device *);
1060 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
1061 int features);
1062 int (*gso_send_check)(struct sk_buff *skb);
1063 struct sk_buff **(*gro_receive)(struct sk_buff **head,
1064 struct sk_buff *skb);
1065 int (*gro_complete)(struct sk_buff *skb);
1066 void *af_packet_priv;
1067 struct list_head list;
1068 };
1069
1070 #include <linux/interrupt.h>
1071 #include <linux/notifier.h>
1072
1073 extern rwlock_t dev_base_lock; /* Device list lock */
1074
1075
1076 #define for_each_netdev(net, d) \
1077 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1078 #define for_each_netdev_safe(net, d, n) \
1079 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1080 #define for_each_netdev_continue(net, d) \
1081 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1082 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
1083
1084 static inline struct net_device *next_net_device(struct net_device *dev)
1085 {
1086 struct list_head *lh;
1087 struct net *net;
1088
1089 net = dev_net(dev);
1090 lh = dev->dev_list.next;
1091 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1092 }
1093
1094 static inline struct net_device *first_net_device(struct net *net)
1095 {
1096 return list_empty(&net->dev_base_head) ? NULL :
1097 net_device_entry(net->dev_base_head.next);
1098 }
1099
1100 extern int netdev_boot_setup_check(struct net_device *dev);
1101 extern unsigned long netdev_boot_base(const char *prefix, int unit);
1102 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
1103 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1104 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1105 extern void dev_add_pack(struct packet_type *pt);
1106 extern void dev_remove_pack(struct packet_type *pt);
1107 extern void __dev_remove_pack(struct packet_type *pt);
1108
1109 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags,
1110 unsigned short mask);
1111 extern struct net_device *dev_get_by_name(struct net *net, const char *name);
1112 extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
1113 extern int dev_alloc_name(struct net_device *dev, const char *name);
1114 extern int dev_open(struct net_device *dev);
1115 extern int dev_close(struct net_device *dev);
1116 extern void dev_disable_lro(struct net_device *dev);
1117 extern int dev_queue_xmit(struct sk_buff *skb);
1118 extern int register_netdevice(struct net_device *dev);
1119 extern void unregister_netdevice(struct net_device *dev);
1120 extern void free_netdev(struct net_device *dev);
1121 extern void synchronize_net(void);
1122 extern int register_netdevice_notifier(struct notifier_block *nb);
1123 extern int unregister_netdevice_notifier(struct notifier_block *nb);
1124 extern int init_dummy_netdev(struct net_device *dev);
1125 extern void netdev_resync_ops(struct net_device *dev);
1126
1127 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1128 extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
1129 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
1130 extern int dev_restart(struct net_device *dev);
1131 #ifdef CONFIG_NETPOLL_TRAP
1132 extern int netpoll_trap(void);
1133 #endif
1134 extern int skb_gro_receive(struct sk_buff **head,
1135 struct sk_buff *skb);
1136 extern void skb_gro_reset_offset(struct sk_buff *skb);
1137
1138 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1139 {
1140 return NAPI_GRO_CB(skb)->data_offset;
1141 }
1142
1143 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1144 {
1145 return skb->len - NAPI_GRO_CB(skb)->data_offset;
1146 }
1147
1148 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1149 {
1150 NAPI_GRO_CB(skb)->data_offset += len;
1151 }
1152
1153 static inline void *skb_gro_header_fast(struct sk_buff *skb,
1154 unsigned int offset)
1155 {
1156 return NAPI_GRO_CB(skb)->frag0 + offset;
1157 }
1158
1159 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1160 {
1161 return NAPI_GRO_CB(skb)->frag0_len < hlen;
1162 }
1163
1164 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1165 unsigned int offset)
1166 {
1167 NAPI_GRO_CB(skb)->frag0 = NULL;
1168 NAPI_GRO_CB(skb)->frag0_len = 0;
1169 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1170 }
1171
1172 static inline void *skb_gro_mac_header(struct sk_buff *skb)
1173 {
1174 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1175 }
1176
1177 static inline void *skb_gro_network_header(struct sk_buff *skb)
1178 {
1179 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1180 skb_network_offset(skb);
1181 }
1182
1183 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1184 unsigned short type,
1185 const void *daddr, const void *saddr,
1186 unsigned len)
1187 {
1188 if (!dev->header_ops || !dev->header_ops->create)
1189 return 0;
1190
1191 return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1192 }
1193
1194 static inline int dev_parse_header(const struct sk_buff *skb,
1195 unsigned char *haddr)
1196 {
1197 const struct net_device *dev = skb->dev;
1198
1199 if (!dev->header_ops || !dev->header_ops->parse)
1200 return 0;
1201 return dev->header_ops->parse(skb, haddr);
1202 }
1203
1204 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1205 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1206 static inline int unregister_gifconf(unsigned int family)
1207 {
1208 return register_gifconf(family, NULL);
1209 }
1210
1211 /*
1212 * Incoming packets are placed on per-cpu queues so that
1213 * no locking is needed.
1214 */
1215 struct softnet_data
1216 {
1217 struct Qdisc *output_queue;
1218 struct sk_buff_head input_pkt_queue;
1219 struct list_head poll_list;
1220 struct sk_buff *completion_queue;
1221
1222 struct napi_struct backlog;
1223 };
1224
1225 DECLARE_PER_CPU(struct softnet_data,softnet_data);
1226
1227 #define HAVE_NETIF_QUEUE
1228
1229 extern void __netif_schedule(struct Qdisc *q);
1230
1231 static inline void netif_schedule_queue(struct netdev_queue *txq)
1232 {
1233 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1234 __netif_schedule(txq->qdisc);
1235 }
1236
1237 static inline void netif_tx_schedule_all(struct net_device *dev)
1238 {
1239 unsigned int i;
1240
1241 for (i = 0; i < dev->num_tx_queues; i++)
1242 netif_schedule_queue(netdev_get_tx_queue(dev, i));
1243 }
1244
1245 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1246 {
1247 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1248 }
1249
1250 /**
1251 * netif_start_queue - allow transmit
1252 * @dev: network device
1253 *
1254 * Allow upper layers to call the device hard_start_xmit routine.
1255 */
1256 static inline void netif_start_queue(struct net_device *dev)
1257 {
1258 netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1259 }
1260
1261 static inline void netif_tx_start_all_queues(struct net_device *dev)
1262 {
1263 unsigned int i;
1264
1265 for (i = 0; i < dev->num_tx_queues; i++) {
1266 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1267 netif_tx_start_queue(txq);
1268 }
1269 }
1270
1271 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1272 {
1273 #ifdef CONFIG_NETPOLL_TRAP
1274 if (netpoll_trap()) {
1275 netif_tx_start_queue(dev_queue);
1276 return;
1277 }
1278 #endif
1279 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1280 __netif_schedule(dev_queue->qdisc);
1281 }
1282
1283 /**
1284 * netif_wake_queue - restart transmit
1285 * @dev: network device
1286 *
1287 * Allow upper layers to call the device hard_start_xmit routine.
1288 * Used for flow control when transmit resources are available.
1289 */
1290 static inline void netif_wake_queue(struct net_device *dev)
1291 {
1292 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1293 }
1294
1295 static inline void netif_tx_wake_all_queues(struct net_device *dev)
1296 {
1297 unsigned int i;
1298
1299 for (i = 0; i < dev->num_tx_queues; i++) {
1300 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1301 netif_tx_wake_queue(txq);
1302 }
1303 }
1304
1305 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1306 {
1307 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1308 }
1309
1310 /**
1311 * netif_stop_queue - stop transmitted packets
1312 * @dev: network device
1313 *
1314 * Stop upper layers calling the device hard_start_xmit routine.
1315 * Used for flow control when transmit resources are unavailable.
1316 */
1317 static inline void netif_stop_queue(struct net_device *dev)
1318 {
1319 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1320 }
1321
1322 static inline void netif_tx_stop_all_queues(struct net_device *dev)
1323 {
1324 unsigned int i;
1325
1326 for (i = 0; i < dev->num_tx_queues; i++) {
1327 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1328 netif_tx_stop_queue(txq);
1329 }
1330 }
1331
1332 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1333 {
1334 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1335 }
1336
1337 /**
1338 * netif_queue_stopped - test if transmit queue is flowblocked
1339 * @dev: network device
1340 *
1341 * Test if transmit queue on device is currently unable to send.
1342 */
1343 static inline int netif_queue_stopped(const struct net_device *dev)
1344 {
1345 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1346 }
1347
1348 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
1349 {
1350 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
1351 }
1352
1353 /**
1354 * netif_running - test if up
1355 * @dev: network device
1356 *
1357 * Test if the device has been brought up.
1358 */
1359 static inline int netif_running(const struct net_device *dev)
1360 {
1361 return test_bit(__LINK_STATE_START, &dev->state);
1362 }
1363
1364 /*
1365 * Routines to manage the subqueues on a device. We only need start
1366 * stop, and a check if it's stopped. All other device management is
1367 * done at the overall netdevice level.
1368 * Also test the device if we're multiqueue.
1369 */
1370
1371 /**
1372 * netif_start_subqueue - allow sending packets on subqueue
1373 * @dev: network device
1374 * @queue_index: sub queue index
1375 *
1376 * Start individual transmit queue of a device with multiple transmit queues.
1377 */
1378 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1379 {
1380 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1381
1382 netif_tx_start_queue(txq);
1383 }
1384
1385 /**
1386 * netif_stop_subqueue - stop sending packets on subqueue
1387 * @dev: network device
1388 * @queue_index: sub queue index
1389 *
1390 * Stop individual transmit queue of a device with multiple transmit queues.
1391 */
1392 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1393 {
1394 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1395 #ifdef CONFIG_NETPOLL_TRAP
1396 if (netpoll_trap())
1397 return;
1398 #endif
1399 netif_tx_stop_queue(txq);
1400 }
1401
1402 /**
1403 * netif_subqueue_stopped - test status of subqueue
1404 * @dev: network device
1405 * @queue_index: sub queue index
1406 *
1407 * Check individual transmit queue of a device with multiple transmit queues.
1408 */
1409 static inline int __netif_subqueue_stopped(const struct net_device *dev,
1410 u16 queue_index)
1411 {
1412 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1413
1414 return netif_tx_queue_stopped(txq);
1415 }
1416
1417 static inline int netif_subqueue_stopped(const struct net_device *dev,
1418 struct sk_buff *skb)
1419 {
1420 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1421 }
1422
1423 /**
1424 * netif_wake_subqueue - allow sending packets on subqueue
1425 * @dev: network device
1426 * @queue_index: sub queue index
1427 *
1428 * Resume individual transmit queue of a device with multiple transmit queues.
1429 */
1430 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1431 {
1432 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1433 #ifdef CONFIG_NETPOLL_TRAP
1434 if (netpoll_trap())
1435 return;
1436 #endif
1437 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1438 __netif_schedule(txq->qdisc);
1439 }
1440
1441 /**
1442 * netif_is_multiqueue - test if device has multiple transmit queues
1443 * @dev: network device
1444 *
1445 * Check if device has multiple transmit queues
1446 */
1447 static inline int netif_is_multiqueue(const struct net_device *dev)
1448 {
1449 return (dev->num_tx_queues > 1);
1450 }
1451
1452 /* Use this variant when it is known for sure that it
1453 * is executing from hardware interrupt context or with hardware interrupts
1454 * disabled.
1455 */
1456 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1457
1458 /* Use this variant in places where it could be invoked
1459 * from either hardware interrupt or other context, with hardware interrupts
1460 * either disabled or enabled.
1461 */
1462 extern void dev_kfree_skb_any(struct sk_buff *skb);
1463
1464 #define HAVE_NETIF_RX 1
1465 extern int netif_rx(struct sk_buff *skb);
1466 extern int netif_rx_ni(struct sk_buff *skb);
1467 #define HAVE_NETIF_RECEIVE_SKB 1
1468 extern int netif_receive_skb(struct sk_buff *skb);
1469 extern void napi_gro_flush(struct napi_struct *napi);
1470 extern int dev_gro_receive(struct napi_struct *napi,
1471 struct sk_buff *skb);
1472 extern int napi_skb_finish(int ret, struct sk_buff *skb);
1473 extern int napi_gro_receive(struct napi_struct *napi,
1474 struct sk_buff *skb);
1475 extern void napi_reuse_skb(struct napi_struct *napi,
1476 struct sk_buff *skb);
1477 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
1478 extern int napi_frags_finish(struct napi_struct *napi,
1479 struct sk_buff *skb, int ret);
1480 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
1481 extern int napi_gro_frags(struct napi_struct *napi);
1482
1483 static inline void napi_free_frags(struct napi_struct *napi)
1484 {
1485 kfree_skb(napi->skb);
1486 napi->skb = NULL;
1487 }
1488
1489 extern void netif_nit_deliver(struct sk_buff *skb);
1490 extern int dev_valid_name(const char *name);
1491 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1492 extern int dev_ethtool(struct net *net, struct ifreq *);
1493 extern unsigned dev_get_flags(const struct net_device *);
1494 extern int dev_change_flags(struct net_device *, unsigned);
1495 extern int dev_change_name(struct net_device *, const char *);
1496 extern int dev_set_alias(struct net_device *, const char *, size_t);
1497 extern int dev_change_net_namespace(struct net_device *,
1498 struct net *, const char *);
1499 extern int dev_set_mtu(struct net_device *, int);
1500 extern int dev_set_mac_address(struct net_device *,
1501 struct sockaddr *);
1502 extern int dev_hard_start_xmit(struct sk_buff *skb,
1503 struct net_device *dev,
1504 struct netdev_queue *txq);
1505
1506 extern int netdev_budget;
1507
1508 /* Called by rtnetlink.c:rtnl_unlock() */
1509 extern void netdev_run_todo(void);
1510
1511 /**
1512 * dev_put - release reference to device
1513 * @dev: network device
1514 *
1515 * Release reference to device to allow it to be freed.
1516 */
1517 static inline void dev_put(struct net_device *dev)
1518 {
1519 atomic_dec(&dev->refcnt);
1520 }
1521
1522 /**
1523 * dev_hold - get reference to device
1524 * @dev: network device
1525 *
1526 * Hold reference to device to keep it from being freed.
1527 */
1528 static inline void dev_hold(struct net_device *dev)
1529 {
1530 atomic_inc(&dev->refcnt);
1531 }
1532
1533 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1534 * and _off may be called from IRQ context, but it is caller
1535 * who is responsible for serialization of these calls.
1536 *
1537 * The name carrier is inappropriate, these functions should really be
1538 * called netif_lowerlayer_*() because they represent the state of any
1539 * kind of lower layer not just hardware media.
1540 */
1541
1542 extern void linkwatch_fire_event(struct net_device *dev);
1543
1544 /**
1545 * netif_carrier_ok - test if carrier present
1546 * @dev: network device
1547 *
1548 * Check if carrier is present on device
1549 */
1550 static inline int netif_carrier_ok(const struct net_device *dev)
1551 {
1552 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1553 }
1554
1555 extern unsigned long dev_trans_start(struct net_device *dev);
1556
1557 extern void __netdev_watchdog_up(struct net_device *dev);
1558
1559 extern void netif_carrier_on(struct net_device *dev);
1560
1561 extern void netif_carrier_off(struct net_device *dev);
1562
1563 /**
1564 * netif_dormant_on - mark device as dormant.
1565 * @dev: network device
1566 *
1567 * Mark device as dormant (as per RFC2863).
1568 *
1569 * The dormant state indicates that the relevant interface is not
1570 * actually in a condition to pass packets (i.e., it is not 'up') but is
1571 * in a "pending" state, waiting for some external event. For "on-
1572 * demand" interfaces, this new state identifies the situation where the
1573 * interface is waiting for events to place it in the up state.
1574 *
1575 */
1576 static inline void netif_dormant_on(struct net_device *dev)
1577 {
1578 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1579 linkwatch_fire_event(dev);
1580 }
1581
1582 /**
1583 * netif_dormant_off - set device as not dormant.
1584 * @dev: network device
1585 *
1586 * Device is not in dormant state.
1587 */
1588 static inline void netif_dormant_off(struct net_device *dev)
1589 {
1590 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1591 linkwatch_fire_event(dev);
1592 }
1593
1594 /**
1595 * netif_dormant - test if carrier present
1596 * @dev: network device
1597 *
1598 * Check if carrier is present on device
1599 */
1600 static inline int netif_dormant(const struct net_device *dev)
1601 {
1602 return test_bit(__LINK_STATE_DORMANT, &dev->state);
1603 }
1604
1605
1606 /**
1607 * netif_oper_up - test if device is operational
1608 * @dev: network device
1609 *
1610 * Check if carrier is operational
1611 */
1612 static inline int netif_oper_up(const struct net_device *dev) {
1613 return (dev->operstate == IF_OPER_UP ||
1614 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1615 }
1616
1617 /**
1618 * netif_device_present - is device available or removed
1619 * @dev: network device
1620 *
1621 * Check if device has not been removed from system.
1622 */
1623 static inline int netif_device_present(struct net_device *dev)
1624 {
1625 return test_bit(__LINK_STATE_PRESENT, &dev->state);
1626 }
1627
1628 extern void netif_device_detach(struct net_device *dev);
1629
1630 extern void netif_device_attach(struct net_device *dev);
1631
1632 /*
1633 * Network interface message level settings
1634 */
1635 #define HAVE_NETIF_MSG 1
1636
1637 enum {
1638 NETIF_MSG_DRV = 0x0001,
1639 NETIF_MSG_PROBE = 0x0002,
1640 NETIF_MSG_LINK = 0x0004,
1641 NETIF_MSG_TIMER = 0x0008,
1642 NETIF_MSG_IFDOWN = 0x0010,
1643 NETIF_MSG_IFUP = 0x0020,
1644 NETIF_MSG_RX_ERR = 0x0040,
1645 NETIF_MSG_TX_ERR = 0x0080,
1646 NETIF_MSG_TX_QUEUED = 0x0100,
1647 NETIF_MSG_INTR = 0x0200,
1648 NETIF_MSG_TX_DONE = 0x0400,
1649 NETIF_MSG_RX_STATUS = 0x0800,
1650 NETIF_MSG_PKTDATA = 0x1000,
1651 NETIF_MSG_HW = 0x2000,
1652 NETIF_MSG_WOL = 0x4000,
1653 };
1654
1655 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
1656 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
1657 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
1658 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
1659 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
1660 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
1661 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
1662 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
1663 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1664 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
1665 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
1666 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1667 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
1668 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
1669 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
1670
1671 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1672 {
1673 /* use default */
1674 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1675 return default_msg_enable_bits;
1676 if (debug_value == 0) /* no output */
1677 return 0;
1678 /* set low N bits */
1679 return (1 << debug_value) - 1;
1680 }
1681
1682 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
1683 {
1684 spin_lock(&txq->_xmit_lock);
1685 txq->xmit_lock_owner = cpu;
1686 }
1687
1688 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
1689 {
1690 spin_lock_bh(&txq->_xmit_lock);
1691 txq->xmit_lock_owner = smp_processor_id();
1692 }
1693
1694 static inline int __netif_tx_trylock(struct netdev_queue *txq)
1695 {
1696 int ok = spin_trylock(&txq->_xmit_lock);
1697 if (likely(ok))
1698 txq->xmit_lock_owner = smp_processor_id();
1699 return ok;
1700 }
1701
1702 static inline void __netif_tx_unlock(struct netdev_queue *txq)
1703 {
1704 txq->xmit_lock_owner = -1;
1705 spin_unlock(&txq->_xmit_lock);
1706 }
1707
1708 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
1709 {
1710 txq->xmit_lock_owner = -1;
1711 spin_unlock_bh(&txq->_xmit_lock);
1712 }
1713
1714 static inline void txq_trans_update(struct netdev_queue *txq)
1715 {
1716 if (txq->xmit_lock_owner != -1)
1717 txq->trans_start = jiffies;
1718 }
1719
1720 /**
1721 * netif_tx_lock - grab network device transmit lock
1722 * @dev: network device
1723 *
1724 * Get network device transmit lock
1725 */
1726 static inline void netif_tx_lock(struct net_device *dev)
1727 {
1728 unsigned int i;
1729 int cpu;
1730
1731 spin_lock(&dev->tx_global_lock);
1732 cpu = smp_processor_id();
1733 for (i = 0; i < dev->num_tx_queues; i++) {
1734 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1735
1736 /* We are the only thread of execution doing a
1737 * freeze, but we have to grab the _xmit_lock in
1738 * order to synchronize with threads which are in
1739 * the ->hard_start_xmit() handler and already
1740 * checked the frozen bit.
1741 */
1742 __netif_tx_lock(txq, cpu);
1743 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
1744 __netif_tx_unlock(txq);
1745 }
1746 }
1747
1748 static inline void netif_tx_lock_bh(struct net_device *dev)
1749 {
1750 local_bh_disable();
1751 netif_tx_lock(dev);
1752 }
1753
1754 static inline void netif_tx_unlock(struct net_device *dev)
1755 {
1756 unsigned int i;
1757
1758 for (i = 0; i < dev->num_tx_queues; i++) {
1759 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1760
1761 /* No need to grab the _xmit_lock here. If the
1762 * queue is not stopped for another reason, we
1763 * force a schedule.
1764 */
1765 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
1766 netif_schedule_queue(txq);
1767 }
1768 spin_unlock(&dev->tx_global_lock);
1769 }
1770
1771 static inline void netif_tx_unlock_bh(struct net_device *dev)
1772 {
1773 netif_tx_unlock(dev);
1774 local_bh_enable();
1775 }
1776
1777 #define HARD_TX_LOCK(dev, txq, cpu) { \
1778 if ((dev->features & NETIF_F_LLTX) == 0) { \
1779 __netif_tx_lock(txq, cpu); \
1780 } \
1781 }
1782
1783 #define HARD_TX_UNLOCK(dev, txq) { \
1784 if ((dev->features & NETIF_F_LLTX) == 0) { \
1785 __netif_tx_unlock(txq); \
1786 } \
1787 }
1788
1789 static inline void netif_tx_disable(struct net_device *dev)
1790 {
1791 unsigned int i;
1792 int cpu;
1793
1794 local_bh_disable();
1795 cpu = smp_processor_id();
1796 for (i = 0; i < dev->num_tx_queues; i++) {
1797 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1798
1799 __netif_tx_lock(txq, cpu);
1800 netif_tx_stop_queue(txq);
1801 __netif_tx_unlock(txq);
1802 }
1803 local_bh_enable();
1804 }
1805
1806 static inline void netif_addr_lock(struct net_device *dev)
1807 {
1808 spin_lock(&dev->addr_list_lock);
1809 }
1810
1811 static inline void netif_addr_lock_bh(struct net_device *dev)
1812 {
1813 spin_lock_bh(&dev->addr_list_lock);
1814 }
1815
1816 static inline void netif_addr_unlock(struct net_device *dev)
1817 {
1818 spin_unlock(&dev->addr_list_lock);
1819 }
1820
1821 static inline void netif_addr_unlock_bh(struct net_device *dev)
1822 {
1823 spin_unlock_bh(&dev->addr_list_lock);
1824 }
1825
1826 /*
1827 * dev_addrs walker. Should be used only for read access. Call with
1828 * rcu_read_lock held.
1829 */
1830 #define for_each_dev_addr(dev, ha) \
1831 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
1832
1833 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1834
1835 extern void ether_setup(struct net_device *dev);
1836
1837 /* Support for loadable net-drivers */
1838 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1839 void (*setup)(struct net_device *),
1840 unsigned int queue_count);
1841 #define alloc_netdev(sizeof_priv, name, setup) \
1842 alloc_netdev_mq(sizeof_priv, name, setup, 1)
1843 extern int register_netdev(struct net_device *dev);
1844 extern void unregister_netdev(struct net_device *dev);
1845
1846 /* Functions used for device addresses handling */
1847 extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
1848 unsigned char addr_type);
1849 extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
1850 unsigned char addr_type);
1851 extern int dev_addr_add_multiple(struct net_device *to_dev,
1852 struct net_device *from_dev,
1853 unsigned char addr_type);
1854 extern int dev_addr_del_multiple(struct net_device *to_dev,
1855 struct net_device *from_dev,
1856 unsigned char addr_type);
1857
1858 /* Functions used for secondary unicast and multicast support */
1859 extern void dev_set_rx_mode(struct net_device *dev);
1860 extern void __dev_set_rx_mode(struct net_device *dev);
1861 extern int dev_unicast_delete(struct net_device *dev, void *addr);
1862 extern int dev_unicast_add(struct net_device *dev, void *addr);
1863 extern int dev_unicast_sync(struct net_device *to, struct net_device *from);
1864 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from);
1865 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1866 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1867 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
1868 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
1869 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1870 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1871 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1872 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1873 extern int dev_set_promiscuity(struct net_device *dev, int inc);
1874 extern int dev_set_allmulti(struct net_device *dev, int inc);
1875 extern void netdev_state_change(struct net_device *dev);
1876 extern void netdev_bonding_change(struct net_device *dev,
1877 unsigned long event);
1878 extern void netdev_features_change(struct net_device *dev);
1879 /* Load a device via the kmod */
1880 extern void dev_load(struct net *net, const char *name);
1881 extern void dev_mcast_init(void);
1882 extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
1883
1884 extern int netdev_max_backlog;
1885 extern int weight_p;
1886 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
1887 extern int skb_checksum_help(struct sk_buff *skb);
1888 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1889 #ifdef CONFIG_BUG
1890 extern void netdev_rx_csum_fault(struct net_device *dev);
1891 #else
1892 static inline void netdev_rx_csum_fault(struct net_device *dev)
1893 {
1894 }
1895 #endif
1896 /* rx skb timestamps */
1897 extern void net_enable_timestamp(void);
1898 extern void net_disable_timestamp(void);
1899
1900 #ifdef CONFIG_PROC_FS
1901 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1902 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1903 extern void dev_seq_stop(struct seq_file *seq, void *v);
1904 #endif
1905
1906 extern int netdev_class_create_file(struct class_attribute *class_attr);
1907 extern void netdev_class_remove_file(struct class_attribute *class_attr);
1908
1909 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
1910
1911 extern void linkwatch_run_queue(void);
1912
1913 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
1914 unsigned long mask);
1915 unsigned long netdev_fix_features(unsigned long features, const char *name);
1916
1917 static inline int net_gso_ok(int features, int gso_type)
1918 {
1919 int feature = gso_type << NETIF_F_GSO_SHIFT;
1920 return (features & feature) == feature;
1921 }
1922
1923 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1924 {
1925 return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
1926 (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
1927 }
1928
1929 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1930 {
1931 return skb_is_gso(skb) &&
1932 (!skb_gso_ok(skb, dev->features) ||
1933 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1934 }
1935
1936 static inline void netif_set_gso_max_size(struct net_device *dev,
1937 unsigned int size)
1938 {
1939 dev->gso_max_size = size;
1940 }
1941
1942 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
1943 struct net_device *master)
1944 {
1945 if (skb->pkt_type == PACKET_HOST) {
1946 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
1947
1948 memcpy(dest, master->dev_addr, ETH_ALEN);
1949 }
1950 }
1951
1952 /* On bonding slaves other than the currently active slave, suppress
1953 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1954 * ARP on active-backup slaves with arp_validate enabled.
1955 */
1956 static inline int skb_bond_should_drop(struct sk_buff *skb)
1957 {
1958 struct net_device *dev = skb->dev;
1959 struct net_device *master = dev->master;
1960
1961 if (master) {
1962 if (master->priv_flags & IFF_MASTER_ARPMON)
1963 dev->last_rx = jiffies;
1964
1965 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
1966 /* Do address unmangle. The local destination address
1967 * will be always the one master has. Provides the right
1968 * functionality in a bridge.
1969 */
1970 skb_bond_set_mac_by_master(skb, master);
1971 }
1972
1973 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
1974 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1975 skb->protocol == __cpu_to_be16(ETH_P_ARP))
1976 return 0;
1977
1978 if (master->priv_flags & IFF_MASTER_ALB) {
1979 if (skb->pkt_type != PACKET_BROADCAST &&
1980 skb->pkt_type != PACKET_MULTICAST)
1981 return 0;
1982 }
1983 if (master->priv_flags & IFF_MASTER_8023AD &&
1984 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
1985 return 0;
1986
1987 return 1;
1988 }
1989 }
1990 return 0;
1991 }
1992
1993 extern struct pernet_operations __net_initdata loopback_net_ops;
1994
1995 static inline int dev_ethtool_get_settings(struct net_device *dev,
1996 struct ethtool_cmd *cmd)
1997 {
1998 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
1999 return -EOPNOTSUPP;
2000 return dev->ethtool_ops->get_settings(dev, cmd);
2001 }
2002
2003 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
2004 {
2005 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
2006 return 0;
2007 return dev->ethtool_ops->get_rx_csum(dev);
2008 }
2009
2010 static inline u32 dev_ethtool_get_flags(struct net_device *dev)
2011 {
2012 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
2013 return 0;
2014 return dev->ethtool_ops->get_flags(dev);
2015 }
2016 #endif /* __KERNEL__ */
2017
2018 #endif /* _LINUX_NETDEVICE_H */
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