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printk removal, receive reordering bugfix
[cor_2_6_31.git] / include / linux / netdevice.h
blobd4a4d986779477b77c4c057a007ec708044ebc61
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 #define NET_RX_CN_LOW 2 /* storm alert, just in case */
76 #define NET_RX_CN_MOD 3 /* Storm on its way! */
77 #define NET_RX_CN_HIGH 4 /* The storm is here */
78 #define NET_RX_BAD 5 /* packet dropped due to kernel error */
79
80 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
81 * indicates that the device will soon be dropping packets, or already drops
82 * some packets of the same priority; prompting us to send less aggressively. */
83 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e))
84 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
85
86 #endif
87
88 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
89
90 /* Driver transmit return codes */
91 #define NETDEV_TX_OK 0 /* driver took care of packet */
92 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
93 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
94
95 #ifdef __KERNEL__
96
97 /*
98 * Compute the worst case header length according to the protocols
99 * used.
100 */
101
102 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
103 # if defined(CONFIG_MAC80211_MESH)
104 # define LL_MAX_HEADER 128
105 # else
106 # define LL_MAX_HEADER 96
107 # endif
108 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
109 # define LL_MAX_HEADER 48
110 #else
111 # define LL_MAX_HEADER 32
112 #endif
113
114 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
115 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
116 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
117 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
118 #define MAX_HEADER LL_MAX_HEADER
119 #else
120 #define MAX_HEADER (LL_MAX_HEADER + 48)
121 #endif
122
123 #endif /* __KERNEL__ */
124
125 /*
126 * Network device statistics. Akin to the 2.0 ether stats but
127 * with byte counters.
128 */
129
130 struct net_device_stats
131 {
132 unsigned long rx_packets; /* total packets received */
133 unsigned long tx_packets; /* total packets transmitted */
134 unsigned long rx_bytes; /* total bytes received */
135 unsigned long tx_bytes; /* total bytes transmitted */
136 unsigned long rx_errors; /* bad packets received */
137 unsigned long tx_errors; /* packet transmit problems */
138 unsigned long rx_dropped; /* no space in linux buffers */
139 unsigned long tx_dropped; /* no space available in linux */
140 unsigned long multicast; /* multicast packets received */
141 unsigned long collisions;
142
143 /* detailed rx_errors: */
144 unsigned long rx_length_errors;
145 unsigned long rx_over_errors; /* receiver ring buff overflow */
146 unsigned long rx_crc_errors; /* recved pkt with crc error */
147 unsigned long rx_frame_errors; /* recv'd frame alignment error */
148 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
149 unsigned long rx_missed_errors; /* receiver missed packet */
150
151 /* detailed tx_errors */
152 unsigned long tx_aborted_errors;
153 unsigned long tx_carrier_errors;
154 unsigned long tx_fifo_errors;
155 unsigned long tx_heartbeat_errors;
156 unsigned long tx_window_errors;
157
158 /* for cslip etc */
159 unsigned long rx_compressed;
160 unsigned long tx_compressed;
161 };
162
163
164 /* Media selection options. */
165 enum {
166 IF_PORT_UNKNOWN = 0,
167 IF_PORT_10BASE2,
168 IF_PORT_10BASET,
169 IF_PORT_AUI,
170 IF_PORT_100BASET,
171 IF_PORT_100BASETX,
172 IF_PORT_100BASEFX
173 };
174
175 #ifdef __KERNEL__
176
177 #include <linux/cache.h>
178 #include <linux/skbuff.h>
179
180 struct neighbour;
181 struct neigh_parms;
182 struct sk_buff;
183
184 struct netif_rx_stats
185 {
186 unsigned total;
187 unsigned dropped;
188 unsigned time_squeeze;
189 unsigned cpu_collision;
190 };
191
192 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
193
194 struct dev_addr_list
195 {
196 struct dev_addr_list *next;
197 u8 da_addr[MAX_ADDR_LEN];
198 u8 da_addrlen;
199 u8 da_synced;
200 int da_users;
201 int da_gusers;
202 };
203
204 /*
205 * We tag multicasts with these structures.
206 */
207
208 #define dev_mc_list dev_addr_list
209 #define dmi_addr da_addr
210 #define dmi_addrlen da_addrlen
211 #define dmi_users da_users
212 #define dmi_gusers da_gusers
213
214 struct netdev_hw_addr {
215 struct list_head list;
216 unsigned char addr[MAX_ADDR_LEN];
217 unsigned char type;
218 #define NETDEV_HW_ADDR_T_LAN 1
219 #define NETDEV_HW_ADDR_T_SAN 2
220 #define NETDEV_HW_ADDR_T_SLAVE 3
221 #define NETDEV_HW_ADDR_T_UNICAST 4
222 int refcount;
223 bool synced;
224 struct rcu_head rcu_head;
225 };
226
227 struct netdev_hw_addr_list {
228 struct list_head list;
229 int count;
230 };
231
232 struct hh_cache
233 {
234 struct hh_cache *hh_next; /* Next entry */
235 atomic_t hh_refcnt; /* number of users */
236 /*
237 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
238 * cache line on SMP.
239 * They are mostly read, but hh_refcnt may be changed quite frequently,
240 * incurring cache line ping pongs.
241 */
242 __be16 hh_type ____cacheline_aligned_in_smp;
243 /* protocol identifier, f.e ETH_P_IP
244 * NOTE: For VLANs, this will be the
245 * encapuslated type. --BLG
246 */
247 u16 hh_len; /* length of header */
248 int (*hh_output)(struct sk_buff *skb);
249 seqlock_t hh_lock;
250
251 /* cached hardware header; allow for machine alignment needs. */
252 #define HH_DATA_MOD 16
253 #define HH_DATA_OFF(__len) \
254 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
255 #define HH_DATA_ALIGN(__len) \
256 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
257 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
258 };
259
260 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
261 * Alternative is:
262 * dev->hard_header_len ? (dev->hard_header_len +
263 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
264 *
265 * We could use other alignment values, but we must maintain the
266 * relationship HH alignment <= LL alignment.
267 *
268 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
269 * may need.
270 */
271 #define LL_RESERVED_SPACE(dev) \
272 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
273 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
274 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
275 #define LL_ALLOCATED_SPACE(dev) \
276 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
277
278 struct header_ops {
279 int (*create) (struct sk_buff *skb, struct net_device *dev,
280 unsigned short type, const void *daddr,
281 const void *saddr, unsigned len);
282 int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
283 int (*rebuild)(struct sk_buff *skb);
284 #define HAVE_HEADER_CACHE
285 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
286 void (*cache_update)(struct hh_cache *hh,
287 const struct net_device *dev,
288 const unsigned char *haddr);
289 };
290
291 /* These flag bits are private to the generic network queueing
292 * layer, they may not be explicitly referenced by any other
293 * code.
294 */
295
296 enum netdev_state_t
297 {
298 __LINK_STATE_START,
299 __LINK_STATE_PRESENT,
300 __LINK_STATE_NOCARRIER,
301 __LINK_STATE_LINKWATCH_PENDING,
302 __LINK_STATE_DORMANT,
303 };
304
305
306 /*
307 * This structure holds at boot time configured netdevice settings. They
308 * are then used in the device probing.
309 */
310 struct netdev_boot_setup {
311 char name[IFNAMSIZ];
312 struct ifmap map;
313 };
314 #define NETDEV_BOOT_SETUP_MAX 8
315
316 extern int __init netdev_boot_setup(char *str);
317
318 /*
319 * Structure for NAPI scheduling similar to tasklet but with weighting
320 */
321 struct napi_struct {
322 /* The poll_list must only be managed by the entity which
323 * changes the state of the NAPI_STATE_SCHED bit. This means
324 * whoever atomically sets that bit can add this napi_struct
325 * to the per-cpu poll_list, and whoever clears that bit
326 * can remove from the list right before clearing the bit.
327 */
328 struct list_head poll_list;
329
330 unsigned long state;
331 int weight;
332 int (*poll)(struct napi_struct *, int);
333 #ifdef CONFIG_NETPOLL
334 spinlock_t poll_lock;
335 int poll_owner;
336 #endif
337
338 unsigned int gro_count;
339
340 struct net_device *dev;
341 struct list_head dev_list;
342 struct sk_buff *gro_list;
343 struct sk_buff *skb;
344 };
345
346 enum
347 {
348 NAPI_STATE_SCHED, /* Poll is scheduled */
349 NAPI_STATE_DISABLE, /* Disable pending */
350 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */
351 };
352
353 enum {
354 GRO_MERGED,
355 GRO_MERGED_FREE,
356 GRO_HELD,
357 GRO_NORMAL,
358 GRO_DROP,
359 };
360
361 extern void __napi_schedule(struct napi_struct *n);
362
363 static inline int napi_disable_pending(struct napi_struct *n)
364 {
365 return test_bit(NAPI_STATE_DISABLE, &n->state);
366 }
367
368 /**
369 * napi_schedule_prep - check if napi can be scheduled
370 * @n: napi context
371 *
372 * Test if NAPI routine is already running, and if not mark
373 * it as running. This is used as a condition variable
374 * insure only one NAPI poll instance runs. We also make
375 * sure there is no pending NAPI disable.
376 */
377 static inline int napi_schedule_prep(struct napi_struct *n)
378 {
379 return !napi_disable_pending(n) &&
380 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
381 }
382
383 /**
384 * napi_schedule - schedule NAPI poll
385 * @n: napi context
386 *
387 * Schedule NAPI poll routine to be called if it is not already
388 * running.
389 */
390 static inline void napi_schedule(struct napi_struct *n)
391 {
392 if (napi_schedule_prep(n))
393 __napi_schedule(n);
394 }
395
396 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
397 static inline int napi_reschedule(struct napi_struct *napi)
398 {
399 if (napi_schedule_prep(napi)) {
400 __napi_schedule(napi);
401 return 1;
402 }
403 return 0;
404 }
405
406 /**
407 * napi_complete - NAPI processing complete
408 * @n: napi context
409 *
410 * Mark NAPI processing as complete.
411 */
412 extern void __napi_complete(struct napi_struct *n);
413 extern void napi_complete(struct napi_struct *n);
414
415 /**
416 * napi_disable - prevent NAPI from scheduling
417 * @n: napi context
418 *
419 * Stop NAPI from being scheduled on this context.
420 * Waits till any outstanding processing completes.
421 */
422 static inline void napi_disable(struct napi_struct *n)
423 {
424 set_bit(NAPI_STATE_DISABLE, &n->state);
425 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
426 msleep(1);
427 clear_bit(NAPI_STATE_DISABLE, &n->state);
428 }
429
430 /**
431 * napi_enable - enable NAPI scheduling
432 * @n: napi context
433 *
434 * Resume NAPI from being scheduled on this context.
435 * Must be paired with napi_disable.
436 */
437 static inline void napi_enable(struct napi_struct *n)
438 {
439 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
440 smp_mb__before_clear_bit();
441 clear_bit(NAPI_STATE_SCHED, &n->state);
442 }
443
444 #ifdef CONFIG_SMP
445 /**
446 * napi_synchronize - wait until NAPI is not running
447 * @n: napi context
448 *
449 * Wait until NAPI is done being scheduled on this context.
450 * Waits till any outstanding processing completes but
451 * does not disable future activations.
452 */
453 static inline void napi_synchronize(const struct napi_struct *n)
454 {
455 while (test_bit(NAPI_STATE_SCHED, &n->state))
456 msleep(1);
457 }
458 #else
459 # define napi_synchronize(n) barrier()
460 #endif
461
462 enum netdev_queue_state_t
463 {
464 __QUEUE_STATE_XOFF,
465 __QUEUE_STATE_FROZEN,
466 };
467
468 struct netdev_queue {
469 /*
470 * read mostly part
471 */
472 struct net_device *dev;
473 struct Qdisc *qdisc;
474 unsigned long state;
475 struct Qdisc *qdisc_sleeping;
476 /*
477 * write mostly part
478 */
479 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
480 int xmit_lock_owner;
481 /*
482 * please use this field instead of dev->trans_start
483 */
484 unsigned long trans_start;
485 unsigned long tx_bytes;
486 unsigned long tx_packets;
487 unsigned long tx_dropped;
488 } ____cacheline_aligned_in_smp;
489
490
491 /*
492 * This structure defines the management hooks for network devices.
493 * The following hooks can be defined; unless noted otherwise, they are
494 * optional and can be filled with a null pointer.
495 *
496 * int (*ndo_init)(struct net_device *dev);
497 * This function is called once when network device is registered.
498 * The network device can use this to any late stage initializaton
499 * or semantic validattion. It can fail with an error code which will
500 * be propogated back to register_netdev
501 *
502 * void (*ndo_uninit)(struct net_device *dev);
503 * This function is called when device is unregistered or when registration
504 * fails. It is not called if init fails.
505 *
506 * int (*ndo_open)(struct net_device *dev);
507 * This function is called when network device transistions to the up
508 * state.
509 *
510 * int (*ndo_stop)(struct net_device *dev);
511 * This function is called when network device transistions to the down
512 * state.
513 *
514 * int (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev);
515 * Called when a packet needs to be transmitted.
516 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY, or NETDEV_TX_LOCKED,
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* (*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 int (*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_ddp_setup)(struct net_device *dev,
631 u16 xid,
632 struct scatterlist *sgl,
633 unsigned int sgc);
634 int (*ndo_fcoe_ddp_done)(struct net_device *dev,
635 u16 xid);
636 #endif
637 };
638
639 /*
640 * The DEVICE structure.
641 * Actually, this whole structure is a big mistake. It mixes I/O
642 * data with strictly "high-level" data, and it has to know about
643 * almost every data structure used in the INET module.
644 *
645 * FIXME: cleanup struct net_device such that network protocol info
646 * moves out.
647 */
648
649 struct net_device
650 {
651
652 /*
653 * This is the first field of the "visible" part of this structure
654 * (i.e. as seen by users in the "Space.c" file). It is the name
655 * the interface.
656 */
657 char name[IFNAMSIZ];
658 /* device name hash chain */
659 struct hlist_node name_hlist;
660 /* snmp alias */
661 char *ifalias;
662
663 /*
664 * I/O specific fields
665 * FIXME: Merge these and struct ifmap into one
666 */
667 unsigned long mem_end; /* shared mem end */
668 unsigned long mem_start; /* shared mem start */
669 unsigned long base_addr; /* device I/O address */
670 unsigned int irq; /* device IRQ number */
671
672 /*
673 * Some hardware also needs these fields, but they are not
674 * part of the usual set specified in Space.c.
675 */
676
677 unsigned char if_port; /* Selectable AUI, TP,..*/
678 unsigned char dma; /* DMA channel */
679
680 unsigned long state;
681
682 struct list_head dev_list;
683 struct list_head napi_list;
684
685 /* Net device features */
686 unsigned long features;
687 #define NETIF_F_SG 1 /* Scatter/gather IO. */
688 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
689 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
690 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
691 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
692 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
693 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
694 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
695 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
696 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
697 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
698 #define NETIF_F_GSO 2048 /* Enable software GSO. */
699 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */
700 /* do not use LLTX in new drivers */
701 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
702 #define NETIF_F_GRO 16384 /* Generic receive offload */
703 #define NETIF_F_LRO 32768 /* large receive offload */
704
705 /* the GSO_MASK reserves bits 16 through 23 */
706 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */
707 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */
708
709 /* Segmentation offload features */
710 #define NETIF_F_GSO_SHIFT 16
711 #define NETIF_F_GSO_MASK 0x00ff0000
712 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
713 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
714 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
715 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
716 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
717 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
718
719 /* List of features with software fallbacks. */
720 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
721
722
723 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
724 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
725 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
726 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
727
728 /*
729 * If one device supports one of these features, then enable them
730 * for all in netdev_increment_features.
731 */
732 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
733 NETIF_F_SG | NETIF_F_HIGHDMA | \
734 NETIF_F_FRAGLIST)
735
736 /* Interface index. Unique device identifier */
737 int ifindex;
738 int iflink;
739
740 struct net_device_stats stats;
741
742 #ifdef CONFIG_WIRELESS_EXT
743 /* List of functions to handle Wireless Extensions (instead of ioctl).
744 * See <net/iw_handler.h> for details. Jean II */
745 const struct iw_handler_def * wireless_handlers;
746 /* Instance data managed by the core of Wireless Extensions. */
747 struct iw_public_data * wireless_data;
748 #endif
749 /* Management operations */
750 const struct net_device_ops *netdev_ops;
751 const struct ethtool_ops *ethtool_ops;
752
753 /* Hardware header description */
754 const struct header_ops *header_ops;
755
756 unsigned int flags; /* interface flags (a la BSD) */
757 unsigned short gflags;
758 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
759 unsigned short padded; /* How much padding added by alloc_netdev() */
760
761 unsigned char operstate; /* RFC2863 operstate */
762 unsigned char link_mode; /* mapping policy to operstate */
763
764 unsigned mtu; /* interface MTU value */
765 unsigned short type; /* interface hardware type */
766 unsigned short hard_header_len; /* hardware hdr length */
767
768 /* extra head- and tailroom the hardware may need, but not in all cases
769 * can this be guaranteed, especially tailroom. Some cases also use
770 * LL_MAX_HEADER instead to allocate the skb.
771 */
772 unsigned short needed_headroom;
773 unsigned short needed_tailroom;
774
775 struct net_device *master; /* Pointer to master device of a group,
776 * which this device is member of.
777 */
778
779 /* Interface address info. */
780 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
781 unsigned char addr_len; /* hardware address length */
782 unsigned short dev_id; /* for shared network cards */
783
784 struct netdev_hw_addr_list uc; /* Secondary unicast
785 mac addresses */
786 int uc_promisc;
787 spinlock_t addr_list_lock;
788 struct dev_addr_list *mc_list; /* Multicast mac addresses */
789 int mc_count; /* Number of installed mcasts */
790 unsigned int promiscuity;
791 unsigned int allmulti;
792
793
794 /* Protocol specific pointers */
795
796 #ifdef CONFIG_NET_DSA
797 void *dsa_ptr; /* dsa specific data */
798 #endif
799 void *atalk_ptr; /* AppleTalk link */
800 void *ip_ptr; /* IPv4 specific data */
801 void *dn_ptr; /* DECnet specific data */
802 void *ip6_ptr; /* IPv6 specific data */
803 void *ec_ptr; /* Econet specific data */
804 void *ax25_ptr; /* AX.25 specific data */
805 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
806 assign before registering */
807
808 /*
809 * Cache line mostly used on receive path (including eth_type_trans())
810 */
811 unsigned long last_rx; /* Time of last Rx */
812 /* Interface address info used in eth_type_trans() */
813 unsigned char *dev_addr; /* hw address, (before bcast
814 because most packets are
815 unicast) */
816
817 struct netdev_hw_addr_list dev_addrs; /* list of device
818 hw addresses */
819
820 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
821
822 struct netdev_queue rx_queue;
823
824 struct netdev_queue *_tx ____cacheline_aligned_in_smp;
825
826 /* Number of TX queues allocated at alloc_netdev_mq() time */
827 unsigned int num_tx_queues;
828
829 /* Number of TX queues currently active in device */
830 unsigned int real_num_tx_queues;
831
832 unsigned long tx_queue_len; /* Max frames per queue allowed */
833 spinlock_t tx_global_lock;
834 /*
835 * One part is mostly used on xmit path (device)
836 */
837 /* These may be needed for future network-power-down code. */
838
839 /*
840 * trans_start here is expensive for high speed devices on SMP,
841 * please use netdev_queue->trans_start instead.
842 */
843 unsigned long trans_start; /* Time (in jiffies) of last Tx */
844
845 int watchdog_timeo; /* used by dev_watchdog() */
846 struct timer_list watchdog_timer;
847
848 /* Number of references to this device */
849 atomic_t refcnt ____cacheline_aligned_in_smp;
850
851 /* delayed register/unregister */
852 struct list_head todo_list;
853 /* device index hash chain */
854 struct hlist_node index_hlist;
855
856 struct net_device *link_watch_next;
857
858 /* register/unregister state machine */
859 enum { NETREG_UNINITIALIZED=0,
860 NETREG_REGISTERED, /* completed register_netdevice */
861 NETREG_UNREGISTERING, /* called unregister_netdevice */
862 NETREG_UNREGISTERED, /* completed unregister todo */
863 NETREG_RELEASED, /* called free_netdev */
864 NETREG_DUMMY, /* dummy device for NAPI poll */
865 } reg_state;
866
867 /* Called from unregister, can be used to call free_netdev */
868 void (*destructor)(struct net_device *dev);
869
870 #ifdef CONFIG_NETPOLL
871 struct netpoll_info *npinfo;
872 #endif
873
874 #ifdef CONFIG_NET_NS
875 /* Network namespace this network device is inside */
876 struct net *nd_net;
877 #endif
878
879 /* mid-layer private */
880 void *ml_priv;
881
882 /* bridge stuff */
883 struct net_bridge_port *br_port;
884 /* macvlan */
885 struct macvlan_port *macvlan_port;
886 /* GARP */
887 struct garp_port *garp_port;
888
889 /* class/net/name entry */
890 struct device dev;
891 /* space for optional statistics and wireless sysfs groups */
892 struct attribute_group *sysfs_groups[3];
893
894 /* rtnetlink link ops */
895 const struct rtnl_link_ops *rtnl_link_ops;
896
897 /* VLAN feature mask */
898 unsigned long vlan_features;
899
900 /* for setting kernel sock attribute on TCP connection setup */
901 #define GSO_MAX_SIZE 65536
902 unsigned int gso_max_size;
903
904 #ifdef CONFIG_DCB
905 /* Data Center Bridging netlink ops */
906 struct dcbnl_rtnl_ops *dcbnl_ops;
907 #endif
908
909 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
910 /* max exchange id for FCoE LRO by ddp */
911 unsigned int fcoe_ddp_xid;
912 #endif
913 };
914 #define to_net_dev(d) container_of(d, struct net_device, dev)
915
916 #define NETDEV_ALIGN 32
917
918 static inline
919 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
920 unsigned int index)
921 {
922 return &dev->_tx[index];
923 }
924
925 static inline void netdev_for_each_tx_queue(struct net_device *dev,
926 void (*f)(struct net_device *,
927 struct netdev_queue *,
928 void *),
929 void *arg)
930 {
931 unsigned int i;
932
933 for (i = 0; i < dev->num_tx_queues; i++)
934 f(dev, &dev->_tx[i], arg);
935 }
936
937 /*
938 * Net namespace inlines
939 */
940 static inline
941 struct net *dev_net(const struct net_device *dev)
942 {
943 #ifdef CONFIG_NET_NS
944 return dev->nd_net;
945 #else
946 return &init_net;
947 #endif
948 }
949
950 static inline
951 void dev_net_set(struct net_device *dev, struct net *net)
952 {
953 #ifdef CONFIG_NET_NS
954 release_net(dev->nd_net);
955 dev->nd_net = hold_net(net);
956 #endif
957 }
958
959 static inline bool netdev_uses_dsa_tags(struct net_device *dev)
960 {
961 #ifdef CONFIG_NET_DSA_TAG_DSA
962 if (dev->dsa_ptr != NULL)
963 return dsa_uses_dsa_tags(dev->dsa_ptr);
964 #endif
965
966 return 0;
967 }
968
969 static inline bool netdev_uses_trailer_tags(struct net_device *dev)
970 {
971 #ifdef CONFIG_NET_DSA_TAG_TRAILER
972 if (dev->dsa_ptr != NULL)
973 return dsa_uses_trailer_tags(dev->dsa_ptr);
974 #endif
975
976 return 0;
977 }
978
979 /**
980 * netdev_priv - access network device private data
981 * @dev: network device
982 *
983 * Get network device private data
984 */
985 static inline void *netdev_priv(const struct net_device *dev)
986 {
987 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
988 }
989
990 /* Set the sysfs physical device reference for the network logical device
991 * if set prior to registration will cause a symlink during initialization.
992 */
993 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
994
995 /**
996 * netif_napi_add - initialize a napi context
997 * @dev: network device
998 * @napi: napi context
999 * @poll: polling function
1000 * @weight: default weight
1001 *
1002 * netif_napi_add() must be used to initialize a napi context prior to calling
1003 * *any* of the other napi related functions.
1004 */
1005 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1006 int (*poll)(struct napi_struct *, int), int weight);
1007
1008 /**
1009 * netif_napi_del - remove a napi context
1010 * @napi: napi context
1011 *
1012 * netif_napi_del() removes a napi context from the network device napi list
1013 */
1014 void netif_napi_del(struct napi_struct *napi);
1015
1016 struct napi_gro_cb {
1017 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1018 void *frag0;
1019
1020 /* Length of frag0. */
1021 unsigned int frag0_len;
1022
1023 /* This indicates where we are processing relative to skb->data. */
1024 int data_offset;
1025
1026 /* This is non-zero if the packet may be of the same flow. */
1027 int same_flow;
1028
1029 /* This is non-zero if the packet cannot be merged with the new skb. */
1030 int flush;
1031
1032 /* Number of segments aggregated. */
1033 int count;
1034
1035 /* Free the skb? */
1036 int free;
1037 };
1038
1039 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1040
1041 struct packet_type {
1042 __be16 type; /* This is really htons(ether_type). */
1043 struct net_device *dev; /* NULL is wildcarded here */
1044 int (*func) (struct sk_buff *,
1045 struct net_device *,
1046 struct packet_type *,
1047 struct net_device *);
1048 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
1049 int features);
1050 int (*gso_send_check)(struct sk_buff *skb);
1051 struct sk_buff **(*gro_receive)(struct sk_buff **head,
1052 struct sk_buff *skb);
1053 int (*gro_complete)(struct sk_buff *skb);
1054 void *af_packet_priv;
1055 struct list_head list;
1056 };
1057
1058 #include <linux/interrupt.h>
1059 #include <linux/notifier.h>
1060
1061 extern rwlock_t dev_base_lock; /* Device list lock */
1062
1063
1064 #define for_each_netdev(net, d) \
1065 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1066 #define for_each_netdev_safe(net, d, n) \
1067 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1068 #define for_each_netdev_continue(net, d) \
1069 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1070 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
1071
1072 static inline struct net_device *next_net_device(struct net_device *dev)
1073 {
1074 struct list_head *lh;
1075 struct net *net;
1076
1077 net = dev_net(dev);
1078 lh = dev->dev_list.next;
1079 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1080 }
1081
1082 static inline struct net_device *first_net_device(struct net *net)
1083 {
1084 return list_empty(&net->dev_base_head) ? NULL :
1085 net_device_entry(net->dev_base_head.next);
1086 }
1087
1088 extern int netdev_boot_setup_check(struct net_device *dev);
1089 extern unsigned long netdev_boot_base(const char *prefix, int unit);
1090 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
1091 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1092 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1093 extern void dev_add_pack(struct packet_type *pt);
1094 extern void dev_remove_pack(struct packet_type *pt);
1095 extern void __dev_remove_pack(struct packet_type *pt);
1096
1097 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags,
1098 unsigned short mask);
1099 extern struct net_device *dev_get_by_name(struct net *net, const char *name);
1100 extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
1101 extern int dev_alloc_name(struct net_device *dev, const char *name);
1102 extern int dev_open(struct net_device *dev);
1103 extern int dev_close(struct net_device *dev);
1104 extern void dev_disable_lro(struct net_device *dev);
1105 extern int dev_queue_xmit(struct sk_buff *skb);
1106 extern int register_netdevice(struct net_device *dev);
1107 extern void unregister_netdevice(struct net_device *dev);
1108 extern void free_netdev(struct net_device *dev);
1109 extern void synchronize_net(void);
1110 extern int register_netdevice_notifier(struct notifier_block *nb);
1111 extern int unregister_netdevice_notifier(struct notifier_block *nb);
1112 extern int init_dummy_netdev(struct net_device *dev);
1113 extern void netdev_resync_ops(struct net_device *dev);
1114
1115 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1116 extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
1117 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
1118 extern int dev_restart(struct net_device *dev);
1119 #ifdef CONFIG_NETPOLL_TRAP
1120 extern int netpoll_trap(void);
1121 #endif
1122 extern int skb_gro_receive(struct sk_buff **head,
1123 struct sk_buff *skb);
1124 extern void skb_gro_reset_offset(struct sk_buff *skb);
1125
1126 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1127 {
1128 return NAPI_GRO_CB(skb)->data_offset;
1129 }
1130
1131 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1132 {
1133 return skb->len - NAPI_GRO_CB(skb)->data_offset;
1134 }
1135
1136 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1137 {
1138 NAPI_GRO_CB(skb)->data_offset += len;
1139 }
1140
1141 static inline void *skb_gro_header_fast(struct sk_buff *skb,
1142 unsigned int offset)
1143 {
1144 return NAPI_GRO_CB(skb)->frag0 + offset;
1145 }
1146
1147 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1148 {
1149 return NAPI_GRO_CB(skb)->frag0_len < hlen;
1150 }
1151
1152 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1153 unsigned int offset)
1154 {
1155 NAPI_GRO_CB(skb)->frag0 = NULL;
1156 NAPI_GRO_CB(skb)->frag0_len = 0;
1157 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1158 }
1159
1160 static inline void *skb_gro_mac_header(struct sk_buff *skb)
1161 {
1162 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1163 }
1164
1165 static inline void *skb_gro_network_header(struct sk_buff *skb)
1166 {
1167 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1168 skb_network_offset(skb);
1169 }
1170
1171 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1172 unsigned short type,
1173 const void *daddr, const void *saddr,
1174 unsigned len)
1175 {
1176 if (!dev->header_ops || !dev->header_ops->create)
1177 return 0;
1178
1179 return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1180 }
1181
1182 static inline int dev_parse_header(const struct sk_buff *skb,
1183 unsigned char *haddr)
1184 {
1185 const struct net_device *dev = skb->dev;
1186
1187 if (!dev->header_ops || !dev->header_ops->parse)
1188 return 0;
1189 return dev->header_ops->parse(skb, haddr);
1190 }
1191
1192 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1193 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1194 static inline int unregister_gifconf(unsigned int family)
1195 {
1196 return register_gifconf(family, NULL);
1197 }
1198
1199 /*
1200 * Incoming packets are placed on per-cpu queues so that
1201 * no locking is needed.
1202 */
1203 struct softnet_data
1204 {
1205 struct Qdisc *output_queue;
1206 struct sk_buff_head input_pkt_queue;
1207 struct list_head poll_list;
1208 struct sk_buff *completion_queue;
1209
1210 struct napi_struct backlog;
1211 };
1212
1213 DECLARE_PER_CPU(struct softnet_data,softnet_data);
1214
1215 #define HAVE_NETIF_QUEUE
1216
1217 extern void __netif_schedule(struct Qdisc *q);
1218
1219 static inline void netif_schedule_queue(struct netdev_queue *txq)
1220 {
1221 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1222 __netif_schedule(txq->qdisc);
1223 }
1224
1225 static inline void netif_tx_schedule_all(struct net_device *dev)
1226 {
1227 unsigned int i;
1228
1229 for (i = 0; i < dev->num_tx_queues; i++)
1230 netif_schedule_queue(netdev_get_tx_queue(dev, i));
1231 }
1232
1233 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1234 {
1235 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1236 }
1237
1238 /**
1239 * netif_start_queue - allow transmit
1240 * @dev: network device
1241 *
1242 * Allow upper layers to call the device hard_start_xmit routine.
1243 */
1244 static inline void netif_start_queue(struct net_device *dev)
1245 {
1246 netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1247 }
1248
1249 static inline void netif_tx_start_all_queues(struct net_device *dev)
1250 {
1251 unsigned int i;
1252
1253 for (i = 0; i < dev->num_tx_queues; i++) {
1254 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1255 netif_tx_start_queue(txq);
1256 }
1257 }
1258
1259 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1260 {
1261 #ifdef CONFIG_NETPOLL_TRAP
1262 if (netpoll_trap()) {
1263 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1264 return;
1265 }
1266 #endif
1267 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1268 __netif_schedule(dev_queue->qdisc);
1269 }
1270
1271 /**
1272 * netif_wake_queue - restart transmit
1273 * @dev: network device
1274 *
1275 * Allow upper layers to call the device hard_start_xmit routine.
1276 * Used for flow control when transmit resources are available.
1277 */
1278 static inline void netif_wake_queue(struct net_device *dev)
1279 {
1280 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1281 }
1282
1283 static inline void netif_tx_wake_all_queues(struct net_device *dev)
1284 {
1285 unsigned int i;
1286
1287 for (i = 0; i < dev->num_tx_queues; i++) {
1288 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1289 netif_tx_wake_queue(txq);
1290 }
1291 }
1292
1293 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1294 {
1295 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1296 }
1297
1298 /**
1299 * netif_stop_queue - stop transmitted packets
1300 * @dev: network device
1301 *
1302 * Stop upper layers calling the device hard_start_xmit routine.
1303 * Used for flow control when transmit resources are unavailable.
1304 */
1305 static inline void netif_stop_queue(struct net_device *dev)
1306 {
1307 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1308 }
1309
1310 static inline void netif_tx_stop_all_queues(struct net_device *dev)
1311 {
1312 unsigned int i;
1313
1314 for (i = 0; i < dev->num_tx_queues; i++) {
1315 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1316 netif_tx_stop_queue(txq);
1317 }
1318 }
1319
1320 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1321 {
1322 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1323 }
1324
1325 /**
1326 * netif_queue_stopped - test if transmit queue is flowblocked
1327 * @dev: network device
1328 *
1329 * Test if transmit queue on device is currently unable to send.
1330 */
1331 static inline int netif_queue_stopped(const struct net_device *dev)
1332 {
1333 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1334 }
1335
1336 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
1337 {
1338 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
1339 }
1340
1341 /**
1342 * netif_running - test if up
1343 * @dev: network device
1344 *
1345 * Test if the device has been brought up.
1346 */
1347 static inline int netif_running(const struct net_device *dev)
1348 {
1349 return test_bit(__LINK_STATE_START, &dev->state);
1350 }
1351
1352 /*
1353 * Routines to manage the subqueues on a device. We only need start
1354 * stop, and a check if it's stopped. All other device management is
1355 * done at the overall netdevice level.
1356 * Also test the device if we're multiqueue.
1357 */
1358
1359 /**
1360 * netif_start_subqueue - allow sending packets on subqueue
1361 * @dev: network device
1362 * @queue_index: sub queue index
1363 *
1364 * Start individual transmit queue of a device with multiple transmit queues.
1365 */
1366 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1367 {
1368 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1369 clear_bit(__QUEUE_STATE_XOFF, &txq->state);
1370 }
1371
1372 /**
1373 * netif_stop_subqueue - stop sending packets on subqueue
1374 * @dev: network device
1375 * @queue_index: sub queue index
1376 *
1377 * Stop individual transmit queue of a device with multiple transmit queues.
1378 */
1379 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1380 {
1381 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1382 #ifdef CONFIG_NETPOLL_TRAP
1383 if (netpoll_trap())
1384 return;
1385 #endif
1386 set_bit(__QUEUE_STATE_XOFF, &txq->state);
1387 }
1388
1389 /**
1390 * netif_subqueue_stopped - test status of subqueue
1391 * @dev: network device
1392 * @queue_index: sub queue index
1393 *
1394 * Check individual transmit queue of a device with multiple transmit queues.
1395 */
1396 static inline int __netif_subqueue_stopped(const struct net_device *dev,
1397 u16 queue_index)
1398 {
1399 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1400 return test_bit(__QUEUE_STATE_XOFF, &txq->state);
1401 }
1402
1403 static inline int netif_subqueue_stopped(const struct net_device *dev,
1404 struct sk_buff *skb)
1405 {
1406 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1407 }
1408
1409 /**
1410 * netif_wake_subqueue - allow sending packets on subqueue
1411 * @dev: network device
1412 * @queue_index: sub queue index
1413 *
1414 * Resume individual transmit queue of a device with multiple transmit queues.
1415 */
1416 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1417 {
1418 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1419 #ifdef CONFIG_NETPOLL_TRAP
1420 if (netpoll_trap())
1421 return;
1422 #endif
1423 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1424 __netif_schedule(txq->qdisc);
1425 }
1426
1427 /**
1428 * netif_is_multiqueue - test if device has multiple transmit queues
1429 * @dev: network device
1430 *
1431 * Check if device has multiple transmit queues
1432 */
1433 static inline int netif_is_multiqueue(const struct net_device *dev)
1434 {
1435 return (dev->num_tx_queues > 1);
1436 }
1437
1438 /* Use this variant when it is known for sure that it
1439 * is executing from hardware interrupt context or with hardware interrupts
1440 * disabled.
1441 */
1442 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1443
1444 /* Use this variant in places where it could be invoked
1445 * from either hardware interrupt or other context, with hardware interrupts
1446 * either disabled or enabled.
1447 */
1448 extern void dev_kfree_skb_any(struct sk_buff *skb);
1449
1450 #define HAVE_NETIF_RX 1
1451 extern int netif_rx(struct sk_buff *skb);
1452 extern int netif_rx_ni(struct sk_buff *skb);
1453 #define HAVE_NETIF_RECEIVE_SKB 1
1454 extern int netif_receive_skb(struct sk_buff *skb);
1455 extern void napi_gro_flush(struct napi_struct *napi);
1456 extern int dev_gro_receive(struct napi_struct *napi,
1457 struct sk_buff *skb);
1458 extern int napi_skb_finish(int ret, struct sk_buff *skb);
1459 extern int napi_gro_receive(struct napi_struct *napi,
1460 struct sk_buff *skb);
1461 extern void napi_reuse_skb(struct napi_struct *napi,
1462 struct sk_buff *skb);
1463 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
1464 extern int napi_frags_finish(struct napi_struct *napi,
1465 struct sk_buff *skb, int ret);
1466 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
1467 extern int napi_gro_frags(struct napi_struct *napi);
1468
1469 static inline void napi_free_frags(struct napi_struct *napi)
1470 {
1471 kfree_skb(napi->skb);
1472 napi->skb = NULL;
1473 }
1474
1475 extern void netif_nit_deliver(struct sk_buff *skb);
1476 extern int dev_valid_name(const char *name);
1477 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1478 extern int dev_ethtool(struct net *net, struct ifreq *);
1479 extern unsigned dev_get_flags(const struct net_device *);
1480 extern int dev_change_flags(struct net_device *, unsigned);
1481 extern int dev_change_name(struct net_device *, const char *);
1482 extern int dev_set_alias(struct net_device *, const char *, size_t);
1483 extern int dev_change_net_namespace(struct net_device *,
1484 struct net *, const char *);
1485 extern int dev_set_mtu(struct net_device *, int);
1486 extern int dev_set_mac_address(struct net_device *,
1487 struct sockaddr *);
1488 extern int dev_hard_start_xmit(struct sk_buff *skb,
1489 struct net_device *dev,
1490 struct netdev_queue *txq);
1491
1492 extern int netdev_budget;
1493
1494 /* Called by rtnetlink.c:rtnl_unlock() */
1495 extern void netdev_run_todo(void);
1496
1497 /**
1498 * dev_put - release reference to device
1499 * @dev: network device
1500 *
1501 * Release reference to device to allow it to be freed.
1502 */
1503 static inline void dev_put(struct net_device *dev)
1504 {
1505 atomic_dec(&dev->refcnt);
1506 }
1507
1508 /**
1509 * dev_hold - get reference to device
1510 * @dev: network device
1511 *
1512 * Hold reference to device to keep it from being freed.
1513 */
1514 static inline void dev_hold(struct net_device *dev)
1515 {
1516 atomic_inc(&dev->refcnt);
1517 }
1518
1519 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1520 * and _off may be called from IRQ context, but it is caller
1521 * who is responsible for serialization of these calls.
1522 *
1523 * The name carrier is inappropriate, these functions should really be
1524 * called netif_lowerlayer_*() because they represent the state of any
1525 * kind of lower layer not just hardware media.
1526 */
1527
1528 extern void linkwatch_fire_event(struct net_device *dev);
1529
1530 /**
1531 * netif_carrier_ok - test if carrier present
1532 * @dev: network device
1533 *
1534 * Check if carrier is present on device
1535 */
1536 static inline int netif_carrier_ok(const struct net_device *dev)
1537 {
1538 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1539 }
1540
1541 extern unsigned long dev_trans_start(struct net_device *dev);
1542
1543 extern void __netdev_watchdog_up(struct net_device *dev);
1544
1545 extern void netif_carrier_on(struct net_device *dev);
1546
1547 extern void netif_carrier_off(struct net_device *dev);
1548
1549 /**
1550 * netif_dormant_on - mark device as dormant.
1551 * @dev: network device
1552 *
1553 * Mark device as dormant (as per RFC2863).
1554 *
1555 * The dormant state indicates that the relevant interface is not
1556 * actually in a condition to pass packets (i.e., it is not 'up') but is
1557 * in a "pending" state, waiting for some external event. For "on-
1558 * demand" interfaces, this new state identifies the situation where the
1559 * interface is waiting for events to place it in the up state.
1560 *
1561 */
1562 static inline void netif_dormant_on(struct net_device *dev)
1563 {
1564 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1565 linkwatch_fire_event(dev);
1566 }
1567
1568 /**
1569 * netif_dormant_off - set device as not dormant.
1570 * @dev: network device
1571 *
1572 * Device is not in dormant state.
1573 */
1574 static inline void netif_dormant_off(struct net_device *dev)
1575 {
1576 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1577 linkwatch_fire_event(dev);
1578 }
1579
1580 /**
1581 * netif_dormant - test if carrier present
1582 * @dev: network device
1583 *
1584 * Check if carrier is present on device
1585 */
1586 static inline int netif_dormant(const struct net_device *dev)
1587 {
1588 return test_bit(__LINK_STATE_DORMANT, &dev->state);
1589 }
1590
1591
1592 /**
1593 * netif_oper_up - test if device is operational
1594 * @dev: network device
1595 *
1596 * Check if carrier is operational
1597 */
1598 static inline int netif_oper_up(const struct net_device *dev) {
1599 return (dev->operstate == IF_OPER_UP ||
1600 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1601 }
1602
1603 /**
1604 * netif_device_present - is device available or removed
1605 * @dev: network device
1606 *
1607 * Check if device has not been removed from system.
1608 */
1609 static inline int netif_device_present(struct net_device *dev)
1610 {
1611 return test_bit(__LINK_STATE_PRESENT, &dev->state);
1612 }
1613
1614 extern void netif_device_detach(struct net_device *dev);
1615
1616 extern void netif_device_attach(struct net_device *dev);
1617
1618 /*
1619 * Network interface message level settings
1620 */
1621 #define HAVE_NETIF_MSG 1
1622
1623 enum {
1624 NETIF_MSG_DRV = 0x0001,
1625 NETIF_MSG_PROBE = 0x0002,
1626 NETIF_MSG_LINK = 0x0004,
1627 NETIF_MSG_TIMER = 0x0008,
1628 NETIF_MSG_IFDOWN = 0x0010,
1629 NETIF_MSG_IFUP = 0x0020,
1630 NETIF_MSG_RX_ERR = 0x0040,
1631 NETIF_MSG_TX_ERR = 0x0080,
1632 NETIF_MSG_TX_QUEUED = 0x0100,
1633 NETIF_MSG_INTR = 0x0200,
1634 NETIF_MSG_TX_DONE = 0x0400,
1635 NETIF_MSG_RX_STATUS = 0x0800,
1636 NETIF_MSG_PKTDATA = 0x1000,
1637 NETIF_MSG_HW = 0x2000,
1638 NETIF_MSG_WOL = 0x4000,
1639 };
1640
1641 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
1642 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
1643 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
1644 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
1645 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
1646 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
1647 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
1648 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
1649 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1650 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
1651 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
1652 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1653 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
1654 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
1655 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
1656
1657 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1658 {
1659 /* use default */
1660 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1661 return default_msg_enable_bits;
1662 if (debug_value == 0) /* no output */
1663 return 0;
1664 /* set low N bits */
1665 return (1 << debug_value) - 1;
1666 }
1667
1668 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
1669 {
1670 spin_lock(&txq->_xmit_lock);
1671 txq->xmit_lock_owner = cpu;
1672 }
1673
1674 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
1675 {
1676 spin_lock_bh(&txq->_xmit_lock);
1677 txq->xmit_lock_owner = smp_processor_id();
1678 }
1679
1680 static inline int __netif_tx_trylock(struct netdev_queue *txq)
1681 {
1682 int ok = spin_trylock(&txq->_xmit_lock);
1683 if (likely(ok))
1684 txq->xmit_lock_owner = smp_processor_id();
1685 return ok;
1686 }
1687
1688 static inline void __netif_tx_unlock(struct netdev_queue *txq)
1689 {
1690 txq->xmit_lock_owner = -1;
1691 spin_unlock(&txq->_xmit_lock);
1692 }
1693
1694 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
1695 {
1696 txq->xmit_lock_owner = -1;
1697 spin_unlock_bh(&txq->_xmit_lock);
1698 }
1699
1700 static inline void txq_trans_update(struct netdev_queue *txq)
1701 {
1702 if (txq->xmit_lock_owner != -1)
1703 txq->trans_start = jiffies;
1704 }
1705
1706 /**
1707 * netif_tx_lock - grab network device transmit lock
1708 * @dev: network device
1709 *
1710 * Get network device transmit lock
1711 */
1712 static inline void netif_tx_lock(struct net_device *dev)
1713 {
1714 unsigned int i;
1715 int cpu;
1716
1717 spin_lock(&dev->tx_global_lock);
1718 cpu = smp_processor_id();
1719 for (i = 0; i < dev->num_tx_queues; i++) {
1720 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1721
1722 /* We are the only thread of execution doing a
1723 * freeze, but we have to grab the _xmit_lock in
1724 * order to synchronize with threads which are in
1725 * the ->hard_start_xmit() handler and already
1726 * checked the frozen bit.
1727 */
1728 __netif_tx_lock(txq, cpu);
1729 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
1730 __netif_tx_unlock(txq);
1731 }
1732 }
1733
1734 static inline void netif_tx_lock_bh(struct net_device *dev)
1735 {
1736 local_bh_disable();
1737 netif_tx_lock(dev);
1738 }
1739
1740 static inline void netif_tx_unlock(struct net_device *dev)
1741 {
1742 unsigned int i;
1743
1744 for (i = 0; i < dev->num_tx_queues; i++) {
1745 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1746
1747 /* No need to grab the _xmit_lock here. If the
1748 * queue is not stopped for another reason, we
1749 * force a schedule.
1750 */
1751 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
1752 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1753 __netif_schedule(txq->qdisc);
1754 }
1755 spin_unlock(&dev->tx_global_lock);
1756 }
1757
1758 static inline void netif_tx_unlock_bh(struct net_device *dev)
1759 {
1760 netif_tx_unlock(dev);
1761 local_bh_enable();
1762 }
1763
1764 #define HARD_TX_LOCK(dev, txq, cpu) { \
1765 if ((dev->features & NETIF_F_LLTX) == 0) { \
1766 __netif_tx_lock(txq, cpu); \
1767 } \
1768 }
1769
1770 #define HARD_TX_UNLOCK(dev, txq) { \
1771 if ((dev->features & NETIF_F_LLTX) == 0) { \
1772 __netif_tx_unlock(txq); \
1773 } \
1774 }
1775
1776 static inline void netif_tx_disable(struct net_device *dev)
1777 {
1778 unsigned int i;
1779 int cpu;
1780
1781 local_bh_disable();
1782 cpu = smp_processor_id();
1783 for (i = 0; i < dev->num_tx_queues; i++) {
1784 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1785
1786 __netif_tx_lock(txq, cpu);
1787 netif_tx_stop_queue(txq);
1788 __netif_tx_unlock(txq);
1789 }
1790 local_bh_enable();
1791 }
1792
1793 static inline void netif_addr_lock(struct net_device *dev)
1794 {
1795 spin_lock(&dev->addr_list_lock);
1796 }
1797
1798 static inline void netif_addr_lock_bh(struct net_device *dev)
1799 {
1800 spin_lock_bh(&dev->addr_list_lock);
1801 }
1802
1803 static inline void netif_addr_unlock(struct net_device *dev)
1804 {
1805 spin_unlock(&dev->addr_list_lock);
1806 }
1807
1808 static inline void netif_addr_unlock_bh(struct net_device *dev)
1809 {
1810 spin_unlock_bh(&dev->addr_list_lock);
1811 }
1812
1813 /*
1814 * dev_addrs walker. Should be used only for read access. Call with
1815 * rcu_read_lock held.
1816 */
1817 #define for_each_dev_addr(dev, ha) \
1818 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
1819
1820 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1821
1822 extern void ether_setup(struct net_device *dev);
1823
1824 /* Support for loadable net-drivers */
1825 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1826 void (*setup)(struct net_device *),
1827 unsigned int queue_count);
1828 #define alloc_netdev(sizeof_priv, name, setup) \
1829 alloc_netdev_mq(sizeof_priv, name, setup, 1)
1830 extern int register_netdev(struct net_device *dev);
1831 extern void unregister_netdev(struct net_device *dev);
1832
1833 /* Functions used for device addresses handling */
1834 extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
1835 unsigned char addr_type);
1836 extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
1837 unsigned char addr_type);
1838 extern int dev_addr_add_multiple(struct net_device *to_dev,
1839 struct net_device *from_dev,
1840 unsigned char addr_type);
1841 extern int dev_addr_del_multiple(struct net_device *to_dev,
1842 struct net_device *from_dev,
1843 unsigned char addr_type);
1844
1845 /* Functions used for secondary unicast and multicast support */
1846 extern void dev_set_rx_mode(struct net_device *dev);
1847 extern void __dev_set_rx_mode(struct net_device *dev);
1848 extern int dev_unicast_delete(struct net_device *dev, void *addr);
1849 extern int dev_unicast_add(struct net_device *dev, void *addr);
1850 extern int dev_unicast_sync(struct net_device *to, struct net_device *from);
1851 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from);
1852 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1853 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1854 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
1855 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
1856 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1857 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1858 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1859 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1860 extern int dev_set_promiscuity(struct net_device *dev, int inc);
1861 extern int dev_set_allmulti(struct net_device *dev, int inc);
1862 extern void netdev_state_change(struct net_device *dev);
1863 extern void netdev_bonding_change(struct net_device *dev);
1864 extern void netdev_features_change(struct net_device *dev);
1865 /* Load a device via the kmod */
1866 extern void dev_load(struct net *net, const char *name);
1867 extern void dev_mcast_init(void);
1868 extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
1869
1870 extern int netdev_max_backlog;
1871 extern int weight_p;
1872 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
1873 extern int skb_checksum_help(struct sk_buff *skb);
1874 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1875 #ifdef CONFIG_BUG
1876 extern void netdev_rx_csum_fault(struct net_device *dev);
1877 #else
1878 static inline void netdev_rx_csum_fault(struct net_device *dev)
1879 {
1880 }
1881 #endif
1882 /* rx skb timestamps */
1883 extern void net_enable_timestamp(void);
1884 extern void net_disable_timestamp(void);
1885
1886 #ifdef CONFIG_PROC_FS
1887 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1888 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1889 extern void dev_seq_stop(struct seq_file *seq, void *v);
1890 #endif
1891
1892 extern int netdev_class_create_file(struct class_attribute *class_attr);
1893 extern void netdev_class_remove_file(struct class_attribute *class_attr);
1894
1895 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
1896
1897 extern void linkwatch_run_queue(void);
1898
1899 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
1900 unsigned long mask);
1901 unsigned long netdev_fix_features(unsigned long features, const char *name);
1902
1903 static inline int net_gso_ok(int features, int gso_type)
1904 {
1905 int feature = gso_type << NETIF_F_GSO_SHIFT;
1906 return (features & feature) == feature;
1907 }
1908
1909 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1910 {
1911 return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
1912 (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
1913 }
1914
1915 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1916 {
1917 return skb_is_gso(skb) &&
1918 (!skb_gso_ok(skb, dev->features) ||
1919 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1920 }
1921
1922 static inline void netif_set_gso_max_size(struct net_device *dev,
1923 unsigned int size)
1924 {
1925 dev->gso_max_size = size;
1926 }
1927
1928 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
1929 struct net_device *master)
1930 {
1931 if (skb->pkt_type == PACKET_HOST) {
1932 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
1933
1934 memcpy(dest, master->dev_addr, ETH_ALEN);
1935 }
1936 }
1937
1938 /* On bonding slaves other than the currently active slave, suppress
1939 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1940 * ARP on active-backup slaves with arp_validate enabled.
1941 */
1942 static inline int skb_bond_should_drop(struct sk_buff *skb)
1943 {
1944 struct net_device *dev = skb->dev;
1945 struct net_device *master = dev->master;
1946
1947 if (master) {
1948 if (master->priv_flags & IFF_MASTER_ARPMON)
1949 dev->last_rx = jiffies;
1950
1951 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
1952 /* Do address unmangle. The local destination address
1953 * will be always the one master has. Provides the right
1954 * functionality in a bridge.
1955 */
1956 skb_bond_set_mac_by_master(skb, master);
1957 }
1958
1959 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
1960 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1961 skb->protocol == __cpu_to_be16(ETH_P_ARP))
1962 return 0;
1963
1964 if (master->priv_flags & IFF_MASTER_ALB) {
1965 if (skb->pkt_type != PACKET_BROADCAST &&
1966 skb->pkt_type != PACKET_MULTICAST)
1967 return 0;
1968 }
1969 if (master->priv_flags & IFF_MASTER_8023AD &&
1970 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
1971 return 0;
1972
1973 return 1;
1974 }
1975 }
1976 return 0;
1977 }
1978
1979 extern struct pernet_operations __net_initdata loopback_net_ops;
1980
1981 static inline int dev_ethtool_get_settings(struct net_device *dev,
1982 struct ethtool_cmd *cmd)
1983 {
1984 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
1985 return -EOPNOTSUPP;
1986 return dev->ethtool_ops->get_settings(dev, cmd);
1987 }
1988
1989 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
1990 {
1991 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
1992 return 0;
1993 return dev->ethtool_ops->get_rx_csum(dev);
1994 }
1995
1996 static inline u32 dev_ethtool_get_flags(struct net_device *dev)
1997 {
1998 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
1999 return 0;
2000 return dev->ethtool_ops->get_flags(dev);
2001 }
2002 #endif /* __KERNEL__ */
2003
2004 #endif /* _LINUX_NETDEVICE_H */
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