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Linux v2.6.15-rc6
[pohmelfs.git] / include / linux / netdevice.h
blob936f8b76114ea95901ccb74190f2ebc96fc2a3a7
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.Cox@linux.org>
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 <asm/atomic.h>
34 #include <asm/cache.h>
35 #include <asm/byteorder.h>
36
37 #include <linux/config.h>
38 #include <linux/device.h>
39 #include <linux/percpu.h>
40
41 struct divert_blk;
42 struct vlan_group;
43 struct ethtool_ops;
44 struct netpoll_info;
45 /* source back-compat hooks */
46 #define SET_ETHTOOL_OPS(netdev,ops) \
47 ( (netdev)->ethtool_ops = (ops) )
48
49 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
50 functions are available. */
51 #define HAVE_FREE_NETDEV /* free_netdev() */
52 #define HAVE_NETDEV_PRIV /* netdev_priv() */
53
54 #define NET_XMIT_SUCCESS 0
55 #define NET_XMIT_DROP 1 /* skb dropped */
56 #define NET_XMIT_CN 2 /* congestion notification */
57 #define NET_XMIT_POLICED 3 /* skb is shot by police */
58 #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue;
59 (TC use only - dev_queue_xmit
60 returns this as NET_XMIT_SUCCESS) */
61
62 /* Backlog congestion levels */
63 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
64 #define NET_RX_DROP 1 /* packet dropped */
65 #define NET_RX_CN_LOW 2 /* storm alert, just in case */
66 #define NET_RX_CN_MOD 3 /* Storm on its way! */
67 #define NET_RX_CN_HIGH 4 /* The storm is here */
68 #define NET_RX_BAD 5 /* packet dropped due to kernel error */
69
70 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
71
72 #endif
73
74 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
75
76 /* Driver transmit return codes */
77 #define NETDEV_TX_OK 0 /* driver took care of packet */
78 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
79 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
80
81 /*
82 * Compute the worst case header length according to the protocols
83 * used.
84 */
85
86 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
87 #define LL_MAX_HEADER 32
88 #else
89 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
90 #define LL_MAX_HEADER 96
91 #else
92 #define LL_MAX_HEADER 48
93 #endif
94 #endif
95
96 #if !defined(CONFIG_NET_IPIP) && \
97 !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE)
98 #define MAX_HEADER LL_MAX_HEADER
99 #else
100 #define MAX_HEADER (LL_MAX_HEADER + 48)
101 #endif
102
103 /*
104 * Network device statistics. Akin to the 2.0 ether stats but
105 * with byte counters.
106 */
107
108 struct net_device_stats
109 {
110 unsigned long rx_packets; /* total packets received */
111 unsigned long tx_packets; /* total packets transmitted */
112 unsigned long rx_bytes; /* total bytes received */
113 unsigned long tx_bytes; /* total bytes transmitted */
114 unsigned long rx_errors; /* bad packets received */
115 unsigned long tx_errors; /* packet transmit problems */
116 unsigned long rx_dropped; /* no space in linux buffers */
117 unsigned long tx_dropped; /* no space available in linux */
118 unsigned long multicast; /* multicast packets received */
119 unsigned long collisions;
120
121 /* detailed rx_errors: */
122 unsigned long rx_length_errors;
123 unsigned long rx_over_errors; /* receiver ring buff overflow */
124 unsigned long rx_crc_errors; /* recved pkt with crc error */
125 unsigned long rx_frame_errors; /* recv'd frame alignment error */
126 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
127 unsigned long rx_missed_errors; /* receiver missed packet */
128
129 /* detailed tx_errors */
130 unsigned long tx_aborted_errors;
131 unsigned long tx_carrier_errors;
132 unsigned long tx_fifo_errors;
133 unsigned long tx_heartbeat_errors;
134 unsigned long tx_window_errors;
135
136 /* for cslip etc */
137 unsigned long rx_compressed;
138 unsigned long tx_compressed;
139 };
140
141
142 /* Media selection options. */
143 enum {
144 IF_PORT_UNKNOWN = 0,
145 IF_PORT_10BASE2,
146 IF_PORT_10BASET,
147 IF_PORT_AUI,
148 IF_PORT_100BASET,
149 IF_PORT_100BASETX,
150 IF_PORT_100BASEFX
151 };
152
153 #ifdef __KERNEL__
154
155 #include <linux/cache.h>
156 #include <linux/skbuff.h>
157
158 struct neighbour;
159 struct neigh_parms;
160 struct sk_buff;
161
162 struct netif_rx_stats
163 {
164 unsigned total;
165 unsigned dropped;
166 unsigned time_squeeze;
167 unsigned cpu_collision;
168 };
169
170 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
171
172
173 /*
174 * We tag multicasts with these structures.
175 */
176
177 struct dev_mc_list
178 {
179 struct dev_mc_list *next;
180 __u8 dmi_addr[MAX_ADDR_LEN];
181 unsigned char dmi_addrlen;
182 int dmi_users;
183 int dmi_gusers;
184 };
185
186 struct hh_cache
187 {
188 struct hh_cache *hh_next; /* Next entry */
189 atomic_t hh_refcnt; /* number of users */
190 unsigned short hh_type; /* protocol identifier, f.e ETH_P_IP
191 * NOTE: For VLANs, this will be the
192 * encapuslated type. --BLG
193 */
194 int hh_len; /* length of header */
195 int (*hh_output)(struct sk_buff *skb);
196 rwlock_t hh_lock;
197
198 /* cached hardware header; allow for machine alignment needs. */
199 #define HH_DATA_MOD 16
200 #define HH_DATA_OFF(__len) \
201 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
202 #define HH_DATA_ALIGN(__len) \
203 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
204 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
205 };
206
207 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
208 * Alternative is:
209 * dev->hard_header_len ? (dev->hard_header_len +
210 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
211 *
212 * We could use other alignment values, but we must maintain the
213 * relationship HH alignment <= LL alignment.
214 */
215 #define LL_RESERVED_SPACE(dev) \
216 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
217 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
218 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
219
220 /* These flag bits are private to the generic network queueing
221 * layer, they may not be explicitly referenced by any other
222 * code.
223 */
224
225 enum netdev_state_t
226 {
227 __LINK_STATE_XOFF=0,
228 __LINK_STATE_START,
229 __LINK_STATE_PRESENT,
230 __LINK_STATE_SCHED,
231 __LINK_STATE_NOCARRIER,
232 __LINK_STATE_RX_SCHED,
233 __LINK_STATE_LINKWATCH_PENDING
234 };
235
236
237 /*
238 * This structure holds at boot time configured netdevice settings. They
239 * are then used in the device probing.
240 */
241 struct netdev_boot_setup {
242 char name[IFNAMSIZ];
243 struct ifmap map;
244 };
245 #define NETDEV_BOOT_SETUP_MAX 8
246
247 extern int __init netdev_boot_setup(char *str);
248
249 /*
250 * The DEVICE structure.
251 * Actually, this whole structure is a big mistake. It mixes I/O
252 * data with strictly "high-level" data, and it has to know about
253 * almost every data structure used in the INET module.
254 *
255 * FIXME: cleanup struct net_device such that network protocol info
256 * moves out.
257 */
258
259 struct net_device
260 {
261
262 /*
263 * This is the first field of the "visible" part of this structure
264 * (i.e. as seen by users in the "Space.c" file). It is the name
265 * the interface.
266 */
267 char name[IFNAMSIZ];
268 /* device name hash chain */
269 struct hlist_node name_hlist;
270
271 /*
272 * I/O specific fields
273 * FIXME: Merge these and struct ifmap into one
274 */
275 unsigned long mem_end; /* shared mem end */
276 unsigned long mem_start; /* shared mem start */
277 unsigned long base_addr; /* device I/O address */
278 unsigned int irq; /* device IRQ number */
279
280 /*
281 * Some hardware also needs these fields, but they are not
282 * part of the usual set specified in Space.c.
283 */
284
285 unsigned char if_port; /* Selectable AUI, TP,..*/
286 unsigned char dma; /* DMA channel */
287
288 unsigned long state;
289
290 struct net_device *next;
291
292 /* The device initialization function. Called only once. */
293 int (*init)(struct net_device *dev);
294
295 /* ------- Fields preinitialized in Space.c finish here ------- */
296
297 /* Net device features */
298 unsigned long features;
299 #define NETIF_F_SG 1 /* Scatter/gather IO. */
300 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
301 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
302 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
303 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
304 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
305 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
306 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
307 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
308 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
309 #define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */
310 #define NETIF_F_LLTX 4096 /* LockLess TX */
311 #define NETIF_F_UFO 8192 /* Can offload UDP Large Send*/
312
313 struct net_device *next_sched;
314
315 /* Interface index. Unique device identifier */
316 int ifindex;
317 int iflink;
318
319
320 struct net_device_stats* (*get_stats)(struct net_device *dev);
321 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev);
322
323 /* List of functions to handle Wireless Extensions (instead of ioctl).
324 * See <net/iw_handler.h> for details. Jean II */
325 const struct iw_handler_def * wireless_handlers;
326 /* Instance data managed by the core of Wireless Extensions. */
327 struct iw_public_data * wireless_data;
328
329 struct ethtool_ops *ethtool_ops;
330
331 /*
332 * This marks the end of the "visible" part of the structure. All
333 * fields hereafter are internal to the system, and may change at
334 * will (read: may be cleaned up at will).
335 */
336
337
338 unsigned short flags; /* interface flags (a la BSD) */
339 unsigned short gflags;
340 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
341 unsigned short padded; /* How much padding added by alloc_netdev() */
342
343 unsigned mtu; /* interface MTU value */
344 unsigned short type; /* interface hardware type */
345 unsigned short hard_header_len; /* hardware hdr length */
346
347 struct net_device *master; /* Pointer to master device of a group,
348 * which this device is member of.
349 */
350
351 /* Interface address info. */
352 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
353 unsigned char addr_len; /* hardware address length */
354 unsigned short dev_id; /* for shared network cards */
355
356 struct dev_mc_list *mc_list; /* Multicast mac addresses */
357 int mc_count; /* Number of installed mcasts */
358 int promiscuity;
359 int allmulti;
360
361
362 /* Protocol specific pointers */
363
364 void *atalk_ptr; /* AppleTalk link */
365 void *ip_ptr; /* IPv4 specific data */
366 void *dn_ptr; /* DECnet specific data */
367 void *ip6_ptr; /* IPv6 specific data */
368 void *ec_ptr; /* Econet specific data */
369 void *ax25_ptr; /* AX.25 specific data */
370
371 /*
372 * Cache line mostly used on receive path (including eth_type_trans())
373 */
374 struct list_head poll_list ____cacheline_aligned_in_smp;
375 /* Link to poll list */
376
377 int (*poll) (struct net_device *dev, int *quota);
378 int quota;
379 int weight;
380 unsigned long last_rx; /* Time of last Rx */
381 /* Interface address info used in eth_type_trans() */
382 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
383 because most packets are unicast) */
384
385 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
386
387 /*
388 * Cache line mostly used on queue transmit path (qdisc)
389 */
390 /* device queue lock */
391 spinlock_t queue_lock ____cacheline_aligned_in_smp;
392 struct Qdisc *qdisc;
393 struct Qdisc *qdisc_sleeping;
394 struct list_head qdisc_list;
395 unsigned long tx_queue_len; /* Max frames per queue allowed */
396
397 /* ingress path synchronizer */
398 spinlock_t ingress_lock;
399 struct Qdisc *qdisc_ingress;
400
401 /*
402 * One part is mostly used on xmit path (device)
403 */
404 /* hard_start_xmit synchronizer */
405 spinlock_t xmit_lock ____cacheline_aligned_in_smp;
406 /* cpu id of processor entered to hard_start_xmit or -1,
407 if nobody entered there.
408 */
409 int xmit_lock_owner;
410 void *priv; /* pointer to private data */
411 int (*hard_start_xmit) (struct sk_buff *skb,
412 struct net_device *dev);
413 /* These may be needed for future network-power-down code. */
414 unsigned long trans_start; /* Time (in jiffies) of last Tx */
415
416 int watchdog_timeo; /* used by dev_watchdog() */
417 struct timer_list watchdog_timer;
418
419 /*
420 * refcnt is a very hot point, so align it on SMP
421 */
422 /* Number of references to this device */
423 atomic_t refcnt ____cacheline_aligned_in_smp;
424
425 /* delayed register/unregister */
426 struct list_head todo_list;
427 /* device index hash chain */
428 struct hlist_node index_hlist;
429
430 /* register/unregister state machine */
431 enum { NETREG_UNINITIALIZED=0,
432 NETREG_REGISTERING, /* called register_netdevice */
433 NETREG_REGISTERED, /* completed register todo */
434 NETREG_UNREGISTERING, /* called unregister_netdevice */
435 NETREG_UNREGISTERED, /* completed unregister todo */
436 NETREG_RELEASED, /* called free_netdev */
437 } reg_state;
438
439 /* Called after device is detached from network. */
440 void (*uninit)(struct net_device *dev);
441 /* Called after last user reference disappears. */
442 void (*destructor)(struct net_device *dev);
443
444 /* Pointers to interface service routines. */
445 int (*open)(struct net_device *dev);
446 int (*stop)(struct net_device *dev);
447 #define HAVE_NETDEV_POLL
448 int (*hard_header) (struct sk_buff *skb,
449 struct net_device *dev,
450 unsigned short type,
451 void *daddr,
452 void *saddr,
453 unsigned len);
454 int (*rebuild_header)(struct sk_buff *skb);
455 #define HAVE_MULTICAST
456 void (*set_multicast_list)(struct net_device *dev);
457 #define HAVE_SET_MAC_ADDR
458 int (*set_mac_address)(struct net_device *dev,
459 void *addr);
460 #define HAVE_PRIVATE_IOCTL
461 int (*do_ioctl)(struct net_device *dev,
462 struct ifreq *ifr, int cmd);
463 #define HAVE_SET_CONFIG
464 int (*set_config)(struct net_device *dev,
465 struct ifmap *map);
466 #define HAVE_HEADER_CACHE
467 int (*hard_header_cache)(struct neighbour *neigh,
468 struct hh_cache *hh);
469 void (*header_cache_update)(struct hh_cache *hh,
470 struct net_device *dev,
471 unsigned char * haddr);
472 #define HAVE_CHANGE_MTU
473 int (*change_mtu)(struct net_device *dev, int new_mtu);
474
475 #define HAVE_TX_TIMEOUT
476 void (*tx_timeout) (struct net_device *dev);
477
478 void (*vlan_rx_register)(struct net_device *dev,
479 struct vlan_group *grp);
480 void (*vlan_rx_add_vid)(struct net_device *dev,
481 unsigned short vid);
482 void (*vlan_rx_kill_vid)(struct net_device *dev,
483 unsigned short vid);
484
485 int (*hard_header_parse)(struct sk_buff *skb,
486 unsigned char *haddr);
487 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
488 #ifdef CONFIG_NETPOLL
489 struct netpoll_info *npinfo;
490 #endif
491 #ifdef CONFIG_NET_POLL_CONTROLLER
492 void (*poll_controller)(struct net_device *dev);
493 #endif
494
495 /* bridge stuff */
496 struct net_bridge_port *br_port;
497
498 #ifdef CONFIG_NET_DIVERT
499 /* this will get initialized at each interface type init routine */
500 struct divert_blk *divert;
501 #endif /* CONFIG_NET_DIVERT */
502
503 /* class/net/name entry */
504 struct class_device class_dev;
505 };
506
507 #define NETDEV_ALIGN 32
508 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
509
510 static inline void *netdev_priv(struct net_device *dev)
511 {
512 return (char *)dev + ((sizeof(struct net_device)
513 + NETDEV_ALIGN_CONST)
514 & ~NETDEV_ALIGN_CONST);
515 }
516
517 #define SET_MODULE_OWNER(dev) do { } while (0)
518 /* Set the sysfs physical device reference for the network logical device
519 * if set prior to registration will cause a symlink during initialization.
520 */
521 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev))
522
523 struct packet_type {
524 __be16 type; /* This is really htons(ether_type). */
525 struct net_device *dev; /* NULL is wildcarded here */
526 int (*func) (struct sk_buff *,
527 struct net_device *,
528 struct packet_type *,
529 struct net_device *);
530 void *af_packet_priv;
531 struct list_head list;
532 };
533
534 #include <linux/interrupt.h>
535 #include <linux/notifier.h>
536
537 extern struct net_device loopback_dev; /* The loopback */
538 extern struct net_device *dev_base; /* All devices */
539 extern rwlock_t dev_base_lock; /* Device list lock */
540
541 extern int netdev_boot_setup_check(struct net_device *dev);
542 extern unsigned long netdev_boot_base(const char *prefix, int unit);
543 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr);
544 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
545 extern void dev_add_pack(struct packet_type *pt);
546 extern void dev_remove_pack(struct packet_type *pt);
547 extern void __dev_remove_pack(struct packet_type *pt);
548
549 extern struct net_device *dev_get_by_flags(unsigned short flags,
550 unsigned short mask);
551 extern struct net_device *dev_get_by_name(const char *name);
552 extern struct net_device *__dev_get_by_name(const char *name);
553 extern int dev_alloc_name(struct net_device *dev, const char *name);
554 extern int dev_open(struct net_device *dev);
555 extern int dev_close(struct net_device *dev);
556 extern int dev_queue_xmit(struct sk_buff *skb);
557 extern int register_netdevice(struct net_device *dev);
558 extern int unregister_netdevice(struct net_device *dev);
559 extern void free_netdev(struct net_device *dev);
560 extern void synchronize_net(void);
561 extern int register_netdevice_notifier(struct notifier_block *nb);
562 extern int unregister_netdevice_notifier(struct notifier_block *nb);
563 extern int call_netdevice_notifiers(unsigned long val, void *v);
564 extern struct net_device *dev_get_by_index(int ifindex);
565 extern struct net_device *__dev_get_by_index(int ifindex);
566 extern int dev_restart(struct net_device *dev);
567 #ifdef CONFIG_NETPOLL_TRAP
568 extern int netpoll_trap(void);
569 #endif
570
571 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
572 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
573 static inline int unregister_gifconf(unsigned int family)
574 {
575 return register_gifconf(family, NULL);
576 }
577
578 /*
579 * Incoming packets are placed on per-cpu queues so that
580 * no locking is needed.
581 */
582
583 struct softnet_data
584 {
585 struct net_device *output_queue;
586 struct sk_buff_head input_pkt_queue;
587 struct list_head poll_list;
588 struct sk_buff *completion_queue;
589
590 struct net_device backlog_dev; /* Sorry. 8) */
591 };
592
593 DECLARE_PER_CPU(struct softnet_data,softnet_data);
594
595 #define HAVE_NETIF_QUEUE
596
597 static inline void __netif_schedule(struct net_device *dev)
598 {
599 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
600 unsigned long flags;
601 struct softnet_data *sd;
602
603 local_irq_save(flags);
604 sd = &__get_cpu_var(softnet_data);
605 dev->next_sched = sd->output_queue;
606 sd->output_queue = dev;
607 raise_softirq_irqoff(NET_TX_SOFTIRQ);
608 local_irq_restore(flags);
609 }
610 }
611
612 static inline void netif_schedule(struct net_device *dev)
613 {
614 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
615 __netif_schedule(dev);
616 }
617
618 static inline void netif_start_queue(struct net_device *dev)
619 {
620 clear_bit(__LINK_STATE_XOFF, &dev->state);
621 }
622
623 static inline void netif_wake_queue(struct net_device *dev)
624 {
625 #ifdef CONFIG_NETPOLL_TRAP
626 if (netpoll_trap())
627 return;
628 #endif
629 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
630 __netif_schedule(dev);
631 }
632
633 static inline void netif_stop_queue(struct net_device *dev)
634 {
635 #ifdef CONFIG_NETPOLL_TRAP
636 if (netpoll_trap())
637 return;
638 #endif
639 set_bit(__LINK_STATE_XOFF, &dev->state);
640 }
641
642 static inline int netif_queue_stopped(const struct net_device *dev)
643 {
644 return test_bit(__LINK_STATE_XOFF, &dev->state);
645 }
646
647 static inline int netif_running(const struct net_device *dev)
648 {
649 return test_bit(__LINK_STATE_START, &dev->state);
650 }
651
652
653 /* Use this variant when it is known for sure that it
654 * is executing from interrupt context.
655 */
656 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
657 {
658 if (atomic_dec_and_test(&skb->users)) {
659 struct softnet_data *sd;
660 unsigned long flags;
661
662 local_irq_save(flags);
663 sd = &__get_cpu_var(softnet_data);
664 skb->next = sd->completion_queue;
665 sd->completion_queue = skb;
666 raise_softirq_irqoff(NET_TX_SOFTIRQ);
667 local_irq_restore(flags);
668 }
669 }
670
671 /* Use this variant in places where it could be invoked
672 * either from interrupt or non-interrupt context.
673 */
674 static inline void dev_kfree_skb_any(struct sk_buff *skb)
675 {
676 if (in_irq() || irqs_disabled())
677 dev_kfree_skb_irq(skb);
678 else
679 dev_kfree_skb(skb);
680 }
681
682 #define HAVE_NETIF_RX 1
683 extern int netif_rx(struct sk_buff *skb);
684 extern int netif_rx_ni(struct sk_buff *skb);
685 #define HAVE_NETIF_RECEIVE_SKB 1
686 extern int netif_receive_skb(struct sk_buff *skb);
687 extern int dev_ioctl(unsigned int cmd, void __user *);
688 extern int dev_ethtool(struct ifreq *);
689 extern unsigned dev_get_flags(const struct net_device *);
690 extern int dev_change_flags(struct net_device *, unsigned);
691 extern int dev_change_name(struct net_device *, char *);
692 extern int dev_set_mtu(struct net_device *, int);
693 extern int dev_set_mac_address(struct net_device *,
694 struct sockaddr *);
695 extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
696
697 extern void dev_init(void);
698
699 extern int netdev_nit;
700 extern int netdev_budget;
701
702 /* Called by rtnetlink.c:rtnl_unlock() */
703 extern void netdev_run_todo(void);
704
705 static inline void dev_put(struct net_device *dev)
706 {
707 atomic_dec(&dev->refcnt);
708 }
709
710 #define __dev_put(dev) atomic_dec(&(dev)->refcnt)
711 #define dev_hold(dev) atomic_inc(&(dev)->refcnt)
712
713 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
714 * and _off may be called from IRQ context, but it is caller
715 * who is responsible for serialization of these calls.
716 */
717
718 extern void linkwatch_fire_event(struct net_device *dev);
719
720 static inline int netif_carrier_ok(const struct net_device *dev)
721 {
722 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
723 }
724
725 extern void __netdev_watchdog_up(struct net_device *dev);
726
727 extern void netif_carrier_on(struct net_device *dev);
728
729 extern void netif_carrier_off(struct net_device *dev);
730
731 /* Hot-plugging. */
732 static inline int netif_device_present(struct net_device *dev)
733 {
734 return test_bit(__LINK_STATE_PRESENT, &dev->state);
735 }
736
737 static inline void netif_device_detach(struct net_device *dev)
738 {
739 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
740 netif_running(dev)) {
741 netif_stop_queue(dev);
742 }
743 }
744
745 static inline void netif_device_attach(struct net_device *dev)
746 {
747 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
748 netif_running(dev)) {
749 netif_wake_queue(dev);
750 __netdev_watchdog_up(dev);
751 }
752 }
753
754 /*
755 * Network interface message level settings
756 */
757 #define HAVE_NETIF_MSG 1
758
759 enum {
760 NETIF_MSG_DRV = 0x0001,
761 NETIF_MSG_PROBE = 0x0002,
762 NETIF_MSG_LINK = 0x0004,
763 NETIF_MSG_TIMER = 0x0008,
764 NETIF_MSG_IFDOWN = 0x0010,
765 NETIF_MSG_IFUP = 0x0020,
766 NETIF_MSG_RX_ERR = 0x0040,
767 NETIF_MSG_TX_ERR = 0x0080,
768 NETIF_MSG_TX_QUEUED = 0x0100,
769 NETIF_MSG_INTR = 0x0200,
770 NETIF_MSG_TX_DONE = 0x0400,
771 NETIF_MSG_RX_STATUS = 0x0800,
772 NETIF_MSG_PKTDATA = 0x1000,
773 NETIF_MSG_HW = 0x2000,
774 NETIF_MSG_WOL = 0x4000,
775 };
776
777 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
778 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
779 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
780 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
781 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
782 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
783 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
784 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
785 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
786 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
787 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
788 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
789 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
790 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
791 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
792
793 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
794 {
795 /* use default */
796 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
797 return default_msg_enable_bits;
798 if (debug_value == 0) /* no output */
799 return 0;
800 /* set low N bits */
801 return (1 << debug_value) - 1;
802 }
803
804 /* Schedule rx intr now? */
805
806 static inline int netif_rx_schedule_prep(struct net_device *dev)
807 {
808 return netif_running(dev) &&
809 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
810 }
811
812 /* Add interface to tail of rx poll list. This assumes that _prep has
813 * already been called and returned 1.
814 */
815
816 static inline void __netif_rx_schedule(struct net_device *dev)
817 {
818 unsigned long flags;
819
820 local_irq_save(flags);
821 dev_hold(dev);
822 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
823 if (dev->quota < 0)
824 dev->quota += dev->weight;
825 else
826 dev->quota = dev->weight;
827 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
828 local_irq_restore(flags);
829 }
830
831 /* Try to reschedule poll. Called by irq handler. */
832
833 static inline void netif_rx_schedule(struct net_device *dev)
834 {
835 if (netif_rx_schedule_prep(dev))
836 __netif_rx_schedule(dev);
837 }
838
839 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
840 * Do not inline this?
841 */
842 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
843 {
844 if (netif_rx_schedule_prep(dev)) {
845 unsigned long flags;
846
847 dev->quota += undo;
848
849 local_irq_save(flags);
850 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
851 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
852 local_irq_restore(flags);
853 return 1;
854 }
855 return 0;
856 }
857
858 /* Remove interface from poll list: it must be in the poll list
859 * on current cpu. This primitive is called by dev->poll(), when
860 * it completes the work. The device cannot be out of poll list at this
861 * moment, it is BUG().
862 */
863 static inline void netif_rx_complete(struct net_device *dev)
864 {
865 unsigned long flags;
866
867 local_irq_save(flags);
868 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
869 list_del(&dev->poll_list);
870 smp_mb__before_clear_bit();
871 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
872 local_irq_restore(flags);
873 }
874
875 static inline void netif_poll_disable(struct net_device *dev)
876 {
877 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state))
878 /* No hurry. */
879 schedule_timeout_interruptible(1);
880 }
881
882 static inline void netif_poll_enable(struct net_device *dev)
883 {
884 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
885 }
886
887 /* same as netif_rx_complete, except that local_irq_save(flags)
888 * has already been issued
889 */
890 static inline void __netif_rx_complete(struct net_device *dev)
891 {
892 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
893 list_del(&dev->poll_list);
894 smp_mb__before_clear_bit();
895 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
896 }
897
898 static inline void netif_tx_disable(struct net_device *dev)
899 {
900 spin_lock_bh(&dev->xmit_lock);
901 netif_stop_queue(dev);
902 spin_unlock_bh(&dev->xmit_lock);
903 }
904
905 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
906
907 extern void ether_setup(struct net_device *dev);
908
909 /* Support for loadable net-drivers */
910 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
911 void (*setup)(struct net_device *));
912 extern int register_netdev(struct net_device *dev);
913 extern void unregister_netdev(struct net_device *dev);
914 /* Functions used for multicast support */
915 extern void dev_mc_upload(struct net_device *dev);
916 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
917 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
918 extern void dev_mc_discard(struct net_device *dev);
919 extern void dev_set_promiscuity(struct net_device *dev, int inc);
920 extern void dev_set_allmulti(struct net_device *dev, int inc);
921 extern void netdev_state_change(struct net_device *dev);
922 extern void netdev_features_change(struct net_device *dev);
923 /* Load a device via the kmod */
924 extern void dev_load(const char *name);
925 extern void dev_mcast_init(void);
926 extern int netdev_max_backlog;
927 extern int weight_p;
928 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
929 extern int skb_checksum_help(struct sk_buff *skb, int inward);
930 #ifdef CONFIG_BUG
931 extern void netdev_rx_csum_fault(struct net_device *dev);
932 #else
933 static inline void netdev_rx_csum_fault(struct net_device *dev)
934 {
935 }
936 #endif
937 /* rx skb timestamps */
938 extern void net_enable_timestamp(void);
939 extern void net_disable_timestamp(void);
940
941 #ifdef CONFIG_PROC_FS
942 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
943 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
944 extern void dev_seq_stop(struct seq_file *seq, void *v);
945 #endif
946
947 extern void linkwatch_run_queue(void);
948
949 #endif /* __KERNEL__ */
950
951 #endif /* _LINUX_DEV_H */