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Linux v2.6.13-rc3
[pohmelfs.git] / include / linux / netdevice.h
blob3a0ed7f9e8015bb3165fb1e55eaf44493d9521e2
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
248 /*
249 * The DEVICE structure.
250 * Actually, this whole structure is a big mistake. It mixes I/O
251 * data with strictly "high-level" data, and it has to know about
252 * almost every data structure used in the INET module.
253 *
254 * FIXME: cleanup struct net_device such that network protocol info
255 * moves out.
256 */
257
258 struct net_device
259 {
260
261 /*
262 * This is the first field of the "visible" part of this structure
263 * (i.e. as seen by users in the "Space.c" file). It is the name
264 * the interface.
265 */
266 char name[IFNAMSIZ];
267
268 /*
269 * I/O specific fields
270 * FIXME: Merge these and struct ifmap into one
271 */
272 unsigned long mem_end; /* shared mem end */
273 unsigned long mem_start; /* shared mem start */
274 unsigned long base_addr; /* device I/O address */
275 unsigned int irq; /* device IRQ number */
276
277 /*
278 * Some hardware also needs these fields, but they are not
279 * part of the usual set specified in Space.c.
280 */
281
282 unsigned char if_port; /* Selectable AUI, TP,..*/
283 unsigned char dma; /* DMA channel */
284
285 unsigned long state;
286
287 struct net_device *next;
288
289 /* The device initialization function. Called only once. */
290 int (*init)(struct net_device *dev);
291
292 /* ------- Fields preinitialized in Space.c finish here ------- */
293
294 struct net_device *next_sched;
295
296 /* Interface index. Unique device identifier */
297 int ifindex;
298 int iflink;
299
300
301 struct net_device_stats* (*get_stats)(struct net_device *dev);
302 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev);
303
304 /* List of functions to handle Wireless Extensions (instead of ioctl).
305 * See <net/iw_handler.h> for details. Jean II */
306 const struct iw_handler_def * wireless_handlers;
307 /* Instance data managed by the core of Wireless Extensions. */
308 struct iw_public_data * wireless_data;
309
310 struct ethtool_ops *ethtool_ops;
311
312 /*
313 * This marks the end of the "visible" part of the structure. All
314 * fields hereafter are internal to the system, and may change at
315 * will (read: may be cleaned up at will).
316 */
317
318 /* These may be needed for future network-power-down code. */
319 unsigned long trans_start; /* Time (in jiffies) of last Tx */
320 unsigned long last_rx; /* Time of last Rx */
321
322 unsigned short flags; /* interface flags (a la BSD) */
323 unsigned short gflags;
324 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
325 unsigned short padded; /* How much padding added by alloc_netdev() */
326
327 unsigned mtu; /* interface MTU value */
328 unsigned short type; /* interface hardware type */
329 unsigned short hard_header_len; /* hardware hdr length */
330 void *priv; /* pointer to private data */
331
332 struct net_device *master; /* Pointer to master device of a group,
333 * which this device is member of.
334 */
335
336 /* Interface address info. */
337 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
338 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address */
339 unsigned char addr_len; /* hardware address length */
340 unsigned short dev_id; /* for shared network cards */
341
342 struct dev_mc_list *mc_list; /* Multicast mac addresses */
343 int mc_count; /* Number of installed mcasts */
344 int promiscuity;
345 int allmulti;
346
347 int watchdog_timeo;
348 struct timer_list watchdog_timer;
349
350 /* Protocol specific pointers */
351
352 void *atalk_ptr; /* AppleTalk link */
353 void *ip_ptr; /* IPv4 specific data */
354 void *dn_ptr; /* DECnet specific data */
355 void *ip6_ptr; /* IPv6 specific data */
356 void *ec_ptr; /* Econet specific data */
357 void *ax25_ptr; /* AX.25 specific data */
358
359 struct list_head poll_list; /* Link to poll list */
360 int quota;
361 int weight;
362
363 struct Qdisc *qdisc;
364 struct Qdisc *qdisc_sleeping;
365 struct Qdisc *qdisc_ingress;
366 struct list_head qdisc_list;
367 unsigned long tx_queue_len; /* Max frames per queue allowed */
368
369 /* ingress path synchronizer */
370 spinlock_t ingress_lock;
371 /* hard_start_xmit synchronizer */
372 spinlock_t xmit_lock;
373 /* cpu id of processor entered to hard_start_xmit or -1,
374 if nobody entered there.
375 */
376 int xmit_lock_owner;
377 /* device queue lock */
378 spinlock_t queue_lock;
379 /* Number of references to this device */
380 atomic_t refcnt;
381 /* delayed register/unregister */
382 struct list_head todo_list;
383 /* device name hash chain */
384 struct hlist_node name_hlist;
385 /* device index hash chain */
386 struct hlist_node index_hlist;
387
388 /* register/unregister state machine */
389 enum { NETREG_UNINITIALIZED=0,
390 NETREG_REGISTERING, /* called register_netdevice */
391 NETREG_REGISTERED, /* completed register todo */
392 NETREG_UNREGISTERING, /* called unregister_netdevice */
393 NETREG_UNREGISTERED, /* completed unregister todo */
394 NETREG_RELEASED, /* called free_netdev */
395 } reg_state;
396
397 /* Net device features */
398 unsigned long features;
399 #define NETIF_F_SG 1 /* Scatter/gather IO. */
400 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
401 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
402 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
403 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
404 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
405 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
406 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
407 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
408 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
409 #define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */
410 #define NETIF_F_LLTX 4096 /* LockLess TX */
411
412 /* Called after device is detached from network. */
413 void (*uninit)(struct net_device *dev);
414 /* Called after last user reference disappears. */
415 void (*destructor)(struct net_device *dev);
416
417 /* Pointers to interface service routines. */
418 int (*open)(struct net_device *dev);
419 int (*stop)(struct net_device *dev);
420 int (*hard_start_xmit) (struct sk_buff *skb,
421 struct net_device *dev);
422 #define HAVE_NETDEV_POLL
423 int (*poll) (struct net_device *dev, int *quota);
424 int (*hard_header) (struct sk_buff *skb,
425 struct net_device *dev,
426 unsigned short type,
427 void *daddr,
428 void *saddr,
429 unsigned len);
430 int (*rebuild_header)(struct sk_buff *skb);
431 #define HAVE_MULTICAST
432 void (*set_multicast_list)(struct net_device *dev);
433 #define HAVE_SET_MAC_ADDR
434 int (*set_mac_address)(struct net_device *dev,
435 void *addr);
436 #define HAVE_PRIVATE_IOCTL
437 int (*do_ioctl)(struct net_device *dev,
438 struct ifreq *ifr, int cmd);
439 #define HAVE_SET_CONFIG
440 int (*set_config)(struct net_device *dev,
441 struct ifmap *map);
442 #define HAVE_HEADER_CACHE
443 int (*hard_header_cache)(struct neighbour *neigh,
444 struct hh_cache *hh);
445 void (*header_cache_update)(struct hh_cache *hh,
446 struct net_device *dev,
447 unsigned char * haddr);
448 #define HAVE_CHANGE_MTU
449 int (*change_mtu)(struct net_device *dev, int new_mtu);
450
451 #define HAVE_TX_TIMEOUT
452 void (*tx_timeout) (struct net_device *dev);
453
454 void (*vlan_rx_register)(struct net_device *dev,
455 struct vlan_group *grp);
456 void (*vlan_rx_add_vid)(struct net_device *dev,
457 unsigned short vid);
458 void (*vlan_rx_kill_vid)(struct net_device *dev,
459 unsigned short vid);
460
461 int (*hard_header_parse)(struct sk_buff *skb,
462 unsigned char *haddr);
463 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
464 #ifdef CONFIG_NETPOLL
465 struct netpoll_info *npinfo;
466 #endif
467 #ifdef CONFIG_NET_POLL_CONTROLLER
468 void (*poll_controller)(struct net_device *dev);
469 #endif
470
471 /* bridge stuff */
472 struct net_bridge_port *br_port;
473
474 #ifdef CONFIG_NET_DIVERT
475 /* this will get initialized at each interface type init routine */
476 struct divert_blk *divert;
477 #endif /* CONFIG_NET_DIVERT */
478
479 /* class/net/name entry */
480 struct class_device class_dev;
481 };
482
483 #define NETDEV_ALIGN 32
484 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
485
486 static inline void *netdev_priv(struct net_device *dev)
487 {
488 return (char *)dev + ((sizeof(struct net_device)
489 + NETDEV_ALIGN_CONST)
490 & ~NETDEV_ALIGN_CONST);
491 }
492
493 #define SET_MODULE_OWNER(dev) do { } while (0)
494 /* Set the sysfs physical device reference for the network logical device
495 * if set prior to registration will cause a symlink during initialization.
496 */
497 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev))
498
499 struct packet_type {
500 __be16 type; /* This is really htons(ether_type). */
501 struct net_device *dev; /* NULL is wildcarded here */
502 int (*func) (struct sk_buff *, struct net_device *,
503 struct packet_type *);
504 void *af_packet_priv;
505 struct list_head list;
506 };
507
508 #include <linux/interrupt.h>
509 #include <linux/notifier.h>
510
511 extern struct net_device loopback_dev; /* The loopback */
512 extern struct net_device *dev_base; /* All devices */
513 extern rwlock_t dev_base_lock; /* Device list lock */
514
515 extern int netdev_boot_setup_check(struct net_device *dev);
516 extern unsigned long netdev_boot_base(const char *prefix, int unit);
517 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr);
518 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
519 extern void dev_add_pack(struct packet_type *pt);
520 extern void dev_remove_pack(struct packet_type *pt);
521 extern void __dev_remove_pack(struct packet_type *pt);
522
523 extern struct net_device *dev_get_by_flags(unsigned short flags,
524 unsigned short mask);
525 extern struct net_device *dev_get_by_name(const char *name);
526 extern struct net_device *__dev_get_by_name(const char *name);
527 extern int dev_alloc_name(struct net_device *dev, const char *name);
528 extern int dev_open(struct net_device *dev);
529 extern int dev_close(struct net_device *dev);
530 extern int dev_queue_xmit(struct sk_buff *skb);
531 extern int register_netdevice(struct net_device *dev);
532 extern int unregister_netdevice(struct net_device *dev);
533 extern void free_netdev(struct net_device *dev);
534 extern void synchronize_net(void);
535 extern int register_netdevice_notifier(struct notifier_block *nb);
536 extern int unregister_netdevice_notifier(struct notifier_block *nb);
537 extern int call_netdevice_notifiers(unsigned long val, void *v);
538 extern struct net_device *dev_get_by_index(int ifindex);
539 extern struct net_device *__dev_get_by_index(int ifindex);
540 extern int dev_restart(struct net_device *dev);
541 #ifdef CONFIG_NETPOLL_TRAP
542 extern int netpoll_trap(void);
543 #endif
544
545 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
546 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
547 static inline int unregister_gifconf(unsigned int family)
548 {
549 return register_gifconf(family, NULL);
550 }
551
552 /*
553 * Incoming packets are placed on per-cpu queues so that
554 * no locking is needed.
555 */
556
557 struct softnet_data
558 {
559 struct net_device *output_queue;
560 struct sk_buff_head input_pkt_queue;
561 struct list_head poll_list;
562 struct sk_buff *completion_queue;
563
564 struct net_device backlog_dev; /* Sorry. 8) */
565 };
566
567 DECLARE_PER_CPU(struct softnet_data,softnet_data);
568
569 #define HAVE_NETIF_QUEUE
570
571 static inline void __netif_schedule(struct net_device *dev)
572 {
573 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
574 unsigned long flags;
575 struct softnet_data *sd;
576
577 local_irq_save(flags);
578 sd = &__get_cpu_var(softnet_data);
579 dev->next_sched = sd->output_queue;
580 sd->output_queue = dev;
581 raise_softirq_irqoff(NET_TX_SOFTIRQ);
582 local_irq_restore(flags);
583 }
584 }
585
586 static inline void netif_schedule(struct net_device *dev)
587 {
588 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
589 __netif_schedule(dev);
590 }
591
592 static inline void netif_start_queue(struct net_device *dev)
593 {
594 clear_bit(__LINK_STATE_XOFF, &dev->state);
595 }
596
597 static inline void netif_wake_queue(struct net_device *dev)
598 {
599 #ifdef CONFIG_NETPOLL_TRAP
600 if (netpoll_trap())
601 return;
602 #endif
603 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
604 __netif_schedule(dev);
605 }
606
607 static inline void netif_stop_queue(struct net_device *dev)
608 {
609 #ifdef CONFIG_NETPOLL_TRAP
610 if (netpoll_trap())
611 return;
612 #endif
613 set_bit(__LINK_STATE_XOFF, &dev->state);
614 }
615
616 static inline int netif_queue_stopped(const struct net_device *dev)
617 {
618 return test_bit(__LINK_STATE_XOFF, &dev->state);
619 }
620
621 static inline int netif_running(const struct net_device *dev)
622 {
623 return test_bit(__LINK_STATE_START, &dev->state);
624 }
625
626
627 /* Use this variant when it is known for sure that it
628 * is executing from interrupt context.
629 */
630 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
631 {
632 if (atomic_dec_and_test(&skb->users)) {
633 struct softnet_data *sd;
634 unsigned long flags;
635
636 local_irq_save(flags);
637 sd = &__get_cpu_var(softnet_data);
638 skb->next = sd->completion_queue;
639 sd->completion_queue = skb;
640 raise_softirq_irqoff(NET_TX_SOFTIRQ);
641 local_irq_restore(flags);
642 }
643 }
644
645 /* Use this variant in places where it could be invoked
646 * either from interrupt or non-interrupt context.
647 */
648 static inline void dev_kfree_skb_any(struct sk_buff *skb)
649 {
650 if (in_irq() || irqs_disabled())
651 dev_kfree_skb_irq(skb);
652 else
653 dev_kfree_skb(skb);
654 }
655
656 #define HAVE_NETIF_RX 1
657 extern int netif_rx(struct sk_buff *skb);
658 extern int netif_rx_ni(struct sk_buff *skb);
659 #define HAVE_NETIF_RECEIVE_SKB 1
660 extern int netif_receive_skb(struct sk_buff *skb);
661 extern int dev_ioctl(unsigned int cmd, void __user *);
662 extern int dev_ethtool(struct ifreq *);
663 extern unsigned dev_get_flags(const struct net_device *);
664 extern int dev_change_flags(struct net_device *, unsigned);
665 extern int dev_change_name(struct net_device *, char *);
666 extern int dev_set_mtu(struct net_device *, int);
667 extern int dev_set_mac_address(struct net_device *,
668 struct sockaddr *);
669 extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
670
671 extern void dev_init(void);
672
673 extern int netdev_nit;
674
675 /* Called by rtnetlink.c:rtnl_unlock() */
676 extern void netdev_run_todo(void);
677
678 static inline void dev_put(struct net_device *dev)
679 {
680 atomic_dec(&dev->refcnt);
681 }
682
683 #define __dev_put(dev) atomic_dec(&(dev)->refcnt)
684 #define dev_hold(dev) atomic_inc(&(dev)->refcnt)
685
686 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
687 * and _off may be called from IRQ context, but it is caller
688 * who is responsible for serialization of these calls.
689 */
690
691 extern void linkwatch_fire_event(struct net_device *dev);
692
693 static inline int netif_carrier_ok(const struct net_device *dev)
694 {
695 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
696 }
697
698 extern void __netdev_watchdog_up(struct net_device *dev);
699
700 static inline void netif_carrier_on(struct net_device *dev)
701 {
702 if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state))
703 linkwatch_fire_event(dev);
704 if (netif_running(dev))
705 __netdev_watchdog_up(dev);
706 }
707
708 static inline void netif_carrier_off(struct net_device *dev)
709 {
710 if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state))
711 linkwatch_fire_event(dev);
712 }
713
714 /* Hot-plugging. */
715 static inline int netif_device_present(struct net_device *dev)
716 {
717 return test_bit(__LINK_STATE_PRESENT, &dev->state);
718 }
719
720 static inline void netif_device_detach(struct net_device *dev)
721 {
722 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
723 netif_running(dev)) {
724 netif_stop_queue(dev);
725 }
726 }
727
728 static inline void netif_device_attach(struct net_device *dev)
729 {
730 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
731 netif_running(dev)) {
732 netif_wake_queue(dev);
733 __netdev_watchdog_up(dev);
734 }
735 }
736
737 /*
738 * Network interface message level settings
739 */
740 #define HAVE_NETIF_MSG 1
741
742 enum {
743 NETIF_MSG_DRV = 0x0001,
744 NETIF_MSG_PROBE = 0x0002,
745 NETIF_MSG_LINK = 0x0004,
746 NETIF_MSG_TIMER = 0x0008,
747 NETIF_MSG_IFDOWN = 0x0010,
748 NETIF_MSG_IFUP = 0x0020,
749 NETIF_MSG_RX_ERR = 0x0040,
750 NETIF_MSG_TX_ERR = 0x0080,
751 NETIF_MSG_TX_QUEUED = 0x0100,
752 NETIF_MSG_INTR = 0x0200,
753 NETIF_MSG_TX_DONE = 0x0400,
754 NETIF_MSG_RX_STATUS = 0x0800,
755 NETIF_MSG_PKTDATA = 0x1000,
756 NETIF_MSG_HW = 0x2000,
757 NETIF_MSG_WOL = 0x4000,
758 };
759
760 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
761 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
762 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
763 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
764 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
765 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
766 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
767 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
768 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
769 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
770 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
771 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
772 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
773 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
774 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
775
776 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
777 {
778 /* use default */
779 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
780 return default_msg_enable_bits;
781 if (debug_value == 0) /* no output */
782 return 0;
783 /* set low N bits */
784 return (1 << debug_value) - 1;
785 }
786
787 /* Schedule rx intr now? */
788
789 static inline int netif_rx_schedule_prep(struct net_device *dev)
790 {
791 return netif_running(dev) &&
792 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
793 }
794
795 /* Add interface to tail of rx poll list. This assumes that _prep has
796 * already been called and returned 1.
797 */
798
799 static inline void __netif_rx_schedule(struct net_device *dev)
800 {
801 unsigned long flags;
802
803 local_irq_save(flags);
804 dev_hold(dev);
805 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
806 if (dev->quota < 0)
807 dev->quota += dev->weight;
808 else
809 dev->quota = dev->weight;
810 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
811 local_irq_restore(flags);
812 }
813
814 /* Try to reschedule poll. Called by irq handler. */
815
816 static inline void netif_rx_schedule(struct net_device *dev)
817 {
818 if (netif_rx_schedule_prep(dev))
819 __netif_rx_schedule(dev);
820 }
821
822 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
823 * Do not inline this?
824 */
825 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
826 {
827 if (netif_rx_schedule_prep(dev)) {
828 unsigned long flags;
829
830 dev->quota += undo;
831
832 local_irq_save(flags);
833 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
834 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
835 local_irq_restore(flags);
836 return 1;
837 }
838 return 0;
839 }
840
841 /* Remove interface from poll list: it must be in the poll list
842 * on current cpu. This primitive is called by dev->poll(), when
843 * it completes the work. The device cannot be out of poll list at this
844 * moment, it is BUG().
845 */
846 static inline void netif_rx_complete(struct net_device *dev)
847 {
848 unsigned long flags;
849
850 local_irq_save(flags);
851 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
852 list_del(&dev->poll_list);
853 smp_mb__before_clear_bit();
854 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
855 local_irq_restore(flags);
856 }
857
858 static inline void netif_poll_disable(struct net_device *dev)
859 {
860 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
861 /* No hurry. */
862 current->state = TASK_INTERRUPTIBLE;
863 schedule_timeout(1);
864 }
865 }
866
867 static inline void netif_poll_enable(struct net_device *dev)
868 {
869 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
870 }
871
872 /* same as netif_rx_complete, except that local_irq_save(flags)
873 * has already been issued
874 */
875 static inline void __netif_rx_complete(struct net_device *dev)
876 {
877 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
878 list_del(&dev->poll_list);
879 smp_mb__before_clear_bit();
880 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
881 }
882
883 static inline void netif_tx_disable(struct net_device *dev)
884 {
885 spin_lock_bh(&dev->xmit_lock);
886 netif_stop_queue(dev);
887 spin_unlock_bh(&dev->xmit_lock);
888 }
889
890 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
891
892 extern void ether_setup(struct net_device *dev);
893
894 /* Support for loadable net-drivers */
895 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
896 void (*setup)(struct net_device *));
897 extern int register_netdev(struct net_device *dev);
898 extern void unregister_netdev(struct net_device *dev);
899 /* Functions used for multicast support */
900 extern void dev_mc_upload(struct net_device *dev);
901 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
902 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
903 extern void dev_mc_discard(struct net_device *dev);
904 extern void dev_set_promiscuity(struct net_device *dev, int inc);
905 extern void dev_set_allmulti(struct net_device *dev, int inc);
906 extern void netdev_state_change(struct net_device *dev);
907 extern void netdev_features_change(struct net_device *dev);
908 /* Load a device via the kmod */
909 extern void dev_load(const char *name);
910 extern void dev_mcast_init(void);
911 extern int netdev_max_backlog;
912 extern int weight_p;
913 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
914 extern int skb_checksum_help(struct sk_buff *skb, int inward);
915 /* rx skb timestamps */
916 extern void net_enable_timestamp(void);
917 extern void net_disable_timestamp(void);
918
919 #endif /* __KERNEL__ */
920
921 #endif /* _LINUX_DEV_H */