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