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[NETPOLL]: Set poll_owner to -1 before unlocking in netpoll_poll_unlock()
[net-next-2.6.git] / include / linux / netdevice.h
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1da177e4
LT		 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 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 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
41struct divert_blk;
42struct vlan_group;
43struct ethtool_ops;
44struct netpoll;
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
108struct 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. */
143enum {
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
158struct neighbour;
159struct neigh_parms;
160struct sk_buff;
161
162struct netif_rx_stats
163{
164 unsigned total;
165 unsigned dropped;
166 unsigned time_squeeze;
167 unsigned throttled;
168 unsigned fastroute_hit;
169 unsigned fastroute_success;
170 unsigned fastroute_defer;
171 unsigned fastroute_deferred_out;
172 unsigned fastroute_latency_reduction;
173 unsigned cpu_collision;
174};
175
176DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
177
178
179/*
180 * We tag multicasts with these structures.
181 */
182
183struct dev_mc_list
184{
185 struct dev_mc_list *next;
186 __u8 dmi_addr[MAX_ADDR_LEN];
187 unsigned char dmi_addrlen;
188 int dmi_users;
189 int dmi_gusers;
190};
191
192struct hh_cache
193{
194 struct hh_cache *hh_next; /* Next entry */
195 atomic_t hh_refcnt; /* number of users */
196 unsigned short hh_type; /* protocol identifier, f.e ETH_P_IP
197 * NOTE: For VLANs, this will be the
198 * encapuslated type. --BLG
199 */
200 int hh_len; /* length of header */
201 int (*hh_output)(struct sk_buff *skb);
202 rwlock_t hh_lock;
203
204 /* cached hardware header; allow for machine alignment needs. */
205#define HH_DATA_MOD 16
206#define HH_DATA_OFF(__len) \
5ba0eac6 207 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
1da177e4
LT		 208#define HH_DATA_ALIGN(__len) \
209 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
210 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
211};
212
213/* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
214 * Alternative is:
215 * dev->hard_header_len ? (dev->hard_header_len +
216 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
217 *
218 * We could use other alignment values, but we must maintain the
219 * relationship HH alignment <= LL alignment.
220 */
221#define LL_RESERVED_SPACE(dev) \
222 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
223#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
224 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
225
226/* These flag bits are private to the generic network queueing
227 * layer, they may not be explicitly referenced by any other
228 * code.
229 */
230
231enum netdev_state_t
232{
233 __LINK_STATE_XOFF=0,
234 __LINK_STATE_START,
235 __LINK_STATE_PRESENT,
236 __LINK_STATE_SCHED,
237 __LINK_STATE_NOCARRIER,
238 __LINK_STATE_RX_SCHED,
239 __LINK_STATE_LINKWATCH_PENDING
240};
241
242
243/*
244 * This structure holds at boot time configured netdevice settings. They
245 * are then used in the device probing.
246 */
247struct netdev_boot_setup {
248 char name[IFNAMSIZ];
249 struct ifmap map;
250};
251#define NETDEV_BOOT_SETUP_MAX 8
252
253
254/*
255 * The DEVICE structure.
256 * Actually, this whole structure is a big mistake. It mixes I/O
257 * data with strictly "high-level" data, and it has to know about
258 * almost every data structure used in the INET module.
259 *
260 * FIXME: cleanup struct net_device such that network protocol info
261 * moves out.
262 */
263
264struct net_device
265{
266
267 /*
268 * This is the first field of the "visible" part of this structure
269 * (i.e. as seen by users in the "Space.c" file). It is the name
270 * the interface.
271 */
272 char name[IFNAMSIZ];
273
274 /*
275 * I/O specific fields
276 * FIXME: Merge these and struct ifmap into one
277 */
278 unsigned long mem_end; /* shared mem end */
279 unsigned long mem_start; /* shared mem start */
280 unsigned long base_addr; /* device I/O address */
281 unsigned int irq; /* device IRQ number */
282
283 /*
284 * Some hardware also needs these fields, but they are not
285 * part of the usual set specified in Space.c.
286 */
287
288 unsigned char if_port; /* Selectable AUI, TP,..*/
289 unsigned char dma; /* DMA channel */
290
291 unsigned long state;
292
293 struct net_device *next;
294
295 /* The device initialization function. Called only once. */
296 int (*init)(struct net_device *dev);
297
298 /* ------- Fields preinitialized in Space.c finish here ------- */
299
300 struct net_device *next_sched;
301
302 /* Interface index. Unique device identifier */
303 int ifindex;
304 int iflink;
305
306
307 struct net_device_stats* (*get_stats)(struct net_device *dev);
308 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev);
309
310 /* List of functions to handle Wireless Extensions (instead of ioctl).
311 * See <net/iw_handler.h> for details. Jean II */
312 const struct iw_handler_def * wireless_handlers;
313 /* Instance data managed by the core of Wireless Extensions. */
314 struct iw_public_data * wireless_data;
315
316 struct ethtool_ops *ethtool_ops;
317
318 /*
319 * This marks the end of the "visible" part of the structure. All
320 * fields hereafter are internal to the system, and may change at
321 * will (read: may be cleaned up at will).
322 */
323
324 /* These may be needed for future network-power-down code. */
325 unsigned long trans_start; /* Time (in jiffies) of last Tx */
326 unsigned long last_rx; /* Time of last Rx */
327
328 unsigned short flags; /* interface flags (a la BSD) */
329 unsigned short gflags;
330 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
331 unsigned short padded; /* How much padding added by alloc_netdev() */
332
333 unsigned mtu; /* interface MTU value */
334 unsigned short type; /* interface hardware type */
335 unsigned short hard_header_len; /* hardware hdr length */
336 void *priv; /* pointer to private data */
337
338 struct net_device *master; /* Pointer to master device of a group,
339 * which this device is member of.
340 */
341
342 /* Interface address info. */
343 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
344 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address */
345 unsigned char addr_len; /* hardware address length */
346 unsigned short dev_id; /* for shared network cards */
347
348 struct dev_mc_list *mc_list; /* Multicast mac addresses */
349 int mc_count; /* Number of installed mcasts */
350 int promiscuity;
351 int allmulti;
352
353 int watchdog_timeo;
354 struct timer_list watchdog_timer;
355
356 /* Protocol specific pointers */
357
358 void *atalk_ptr; /* AppleTalk link */
359 void *ip_ptr; /* IPv4 specific data */
360 void *dn_ptr; /* DECnet specific data */
361 void *ip6_ptr; /* IPv6 specific data */
362 void *ec_ptr; /* Econet specific data */
363 void *ax25_ptr; /* AX.25 specific data */
364
365 struct list_head poll_list; /* Link to poll list */
366 int quota;
367 int weight;
368
369 struct Qdisc *qdisc;
370 struct Qdisc *qdisc_sleeping;
371 struct Qdisc *qdisc_ingress;
372 struct list_head qdisc_list;
373 unsigned long tx_queue_len; /* Max frames per queue allowed */
374
375 /* ingress path synchronizer */
376 spinlock_t ingress_lock;
377 /* hard_start_xmit synchronizer */
378 spinlock_t xmit_lock;
379 /* cpu id of processor entered to hard_start_xmit or -1,
380 if nobody entered there.
381 */
382 int xmit_lock_owner;
383 /* device queue lock */
384 spinlock_t queue_lock;
385 /* Number of references to this device */
386 atomic_t refcnt;
387 /* delayed register/unregister */
388 struct list_head todo_list;
389 /* device name hash chain */
390 struct hlist_node name_hlist;
391 /* device index hash chain */
392 struct hlist_node index_hlist;
393
394 /* register/unregister state machine */
395 enum { NETREG_UNINITIALIZED=0,
396 NETREG_REGISTERING, /* called register_netdevice */
397 NETREG_REGISTERED, /* completed register todo */
398 NETREG_UNREGISTERING, /* called unregister_netdevice */
399 NETREG_UNREGISTERED, /* completed unregister todo */
400 NETREG_RELEASED, /* called free_netdev */
401 } reg_state;
402
403 /* Net device features */
81e81575 404 unsigned long features;
1da177e4
LT		 405#define NETIF_F_SG 1 /* Scatter/gather IO. */
406#define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
407#define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
408#define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
409#define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
410#define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
411#define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
412#define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
413#define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
414#define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
415#define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */
416#define NETIF_F_LLTX 4096 /* LockLess TX */
417
418 /* Called after device is detached from network. */
419 void (*uninit)(struct net_device *dev);
420 /* Called after last user reference disappears. */
421 void (*destructor)(struct net_device *dev);
422
423 /* Pointers to interface service routines. */
424 int (*open)(struct net_device *dev);
425 int (*stop)(struct net_device *dev);
426 int (*hard_start_xmit) (struct sk_buff *skb,
427 struct net_device *dev);
428#define HAVE_NETDEV_POLL
429 int (*poll) (struct net_device *dev, int *quota);
430 int (*hard_header) (struct sk_buff *skb,
431 struct net_device *dev,
432 unsigned short type,
433 void *daddr,
434 void *saddr,
435 unsigned len);
436 int (*rebuild_header)(struct sk_buff *skb);
437#define HAVE_MULTICAST
438 void (*set_multicast_list)(struct net_device *dev);
439#define HAVE_SET_MAC_ADDR
440 int (*set_mac_address)(struct net_device *dev,
441 void *addr);
442#define HAVE_PRIVATE_IOCTL
443 int (*do_ioctl)(struct net_device *dev,
444 struct ifreq *ifr, int cmd);
445#define HAVE_SET_CONFIG
446 int (*set_config)(struct net_device *dev,
447 struct ifmap *map);
448#define HAVE_HEADER_CACHE
449 int (*hard_header_cache)(struct neighbour *neigh,
450 struct hh_cache *hh);
451 void (*header_cache_update)(struct hh_cache *hh,
452 struct net_device *dev,
453 unsigned char * haddr);
454#define HAVE_CHANGE_MTU
455 int (*change_mtu)(struct net_device *dev, int new_mtu);
456
457#define HAVE_TX_TIMEOUT
458 void (*tx_timeout) (struct net_device *dev);
459
460 void (*vlan_rx_register)(struct net_device *dev,
461 struct vlan_group *grp);
462 void (*vlan_rx_add_vid)(struct net_device *dev,
463 unsigned short vid);
464 void (*vlan_rx_kill_vid)(struct net_device *dev,
465 unsigned short vid);
466
467 int (*hard_header_parse)(struct sk_buff *skb,
468 unsigned char *haddr);
469 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
470#ifdef CONFIG_NETPOLL
471 struct netpoll *np;
472#endif
473#ifdef CONFIG_NET_POLL_CONTROLLER
474 void (*poll_controller)(struct net_device *dev);
475#endif
476
477 /* bridge stuff */
478 struct net_bridge_port *br_port;
479
480#ifdef CONFIG_NET_DIVERT
481 /* this will get initialized at each interface type init routine */
482 struct divert_blk *divert;
483#endif /* CONFIG_NET_DIVERT */
484
485 /* class/net/name entry */
486 struct class_device class_dev;
487};
488
489#define NETDEV_ALIGN 32
490#define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
491
492static inline void *netdev_priv(struct net_device *dev)
493{
494 return (char *)dev + ((sizeof(struct net_device)
495 + NETDEV_ALIGN_CONST)
496 & ~NETDEV_ALIGN_CONST);
497}
498
499#define SET_MODULE_OWNER(dev) do { } while (0)
500/* Set the sysfs physical device reference for the network logical device
501 * if set prior to registration will cause a symlink during initialization.
502 */
503#define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev))
504
505struct packet_type {
205902ec 506 __be16 type; /* This is really htons(ether_type). */
1da177e4
LT		 507 struct net_device *dev; /* NULL is wildcarded here */
508 int (*func) (struct sk_buff *, struct net_device *,
509 struct packet_type *);
510 void *af_packet_priv;
511 struct list_head list;
512};
513
514#include <linux/interrupt.h>
515#include <linux/notifier.h>
516
517extern struct net_device loopback_dev; /* The loopback */
518extern struct net_device *dev_base; /* All devices */
519extern rwlock_t dev_base_lock; /* Device list lock */
520
521extern int netdev_boot_setup_check(struct net_device *dev);
522extern unsigned long netdev_boot_base(const char *prefix, int unit);
523extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr);
524extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
525extern void dev_add_pack(struct packet_type *pt);
526extern void dev_remove_pack(struct packet_type *pt);
527extern void __dev_remove_pack(struct packet_type *pt);
528
529extern struct net_device *dev_get_by_flags(unsigned short flags,
530 unsigned short mask);
531extern struct net_device *dev_get_by_name(const char *name);
532extern struct net_device *__dev_get_by_name(const char *name);
533extern int dev_alloc_name(struct net_device *dev, const char *name);
534extern int dev_open(struct net_device *dev);
535extern int dev_close(struct net_device *dev);
536extern int dev_queue_xmit(struct sk_buff *skb);
537extern int register_netdevice(struct net_device *dev);
538extern int unregister_netdevice(struct net_device *dev);
539extern void free_netdev(struct net_device *dev);
540extern void synchronize_net(void);
541extern int register_netdevice_notifier(struct notifier_block *nb);
542extern int unregister_netdevice_notifier(struct notifier_block *nb);
543extern int call_netdevice_notifiers(unsigned long val, void *v);
544extern struct net_device *dev_get_by_index(int ifindex);
545extern struct net_device *__dev_get_by_index(int ifindex);
546extern int dev_restart(struct net_device *dev);
547#ifdef CONFIG_NETPOLL_TRAP
548extern int netpoll_trap(void);
549#endif
550
551typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
552extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
553static inline int unregister_gifconf(unsigned int family)
554{
555 return register_gifconf(family, NULL);
556}
557
558/*
559 * Incoming packets are placed on per-cpu queues so that
560 * no locking is needed.
561 */
562
563struct softnet_data
564{
565 int throttle;
566 int cng_level;
567 int avg_blog;
568 struct sk_buff_head input_pkt_queue;
569 struct list_head poll_list;
570 struct net_device *output_queue;
571 struct sk_buff *completion_queue;
572
573 struct net_device backlog_dev; /* Sorry. 8) */
574};
575
576DECLARE_PER_CPU(struct softnet_data,softnet_data);
577
578#define HAVE_NETIF_QUEUE
579
580static inline void __netif_schedule(struct net_device *dev)
581{
582 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
583 unsigned long flags;
584 struct softnet_data *sd;
585
586 local_irq_save(flags);
587 sd = &__get_cpu_var(softnet_data);
588 dev->next_sched = sd->output_queue;
589 sd->output_queue = dev;
590 raise_softirq_irqoff(NET_TX_SOFTIRQ);
591 local_irq_restore(flags);
592 }
593}
594
595static inline void netif_schedule(struct net_device *dev)
596{
597 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
598 __netif_schedule(dev);
599}
600
601static inline void netif_start_queue(struct net_device *dev)
602{
603 clear_bit(__LINK_STATE_XOFF, &dev->state);
604}
605
606static inline void netif_wake_queue(struct net_device *dev)
607{
608#ifdef CONFIG_NETPOLL_TRAP
609 if (netpoll_trap())
610 return;
611#endif
612 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
613 __netif_schedule(dev);
614}
615
616static inline void netif_stop_queue(struct net_device *dev)
617{
618#ifdef CONFIG_NETPOLL_TRAP
619 if (netpoll_trap())
620 return;
621#endif
622 set_bit(__LINK_STATE_XOFF, &dev->state);
623}
624
625static inline int netif_queue_stopped(const struct net_device *dev)
626{
627 return test_bit(__LINK_STATE_XOFF, &dev->state);
628}
629
630static inline int netif_running(const struct net_device *dev)
631{
632 return test_bit(__LINK_STATE_START, &dev->state);
633}
634
635
636/* Use this variant when it is known for sure that it
637 * is executing from interrupt context.
638 */
639static inline void dev_kfree_skb_irq(struct sk_buff *skb)
640{
641 if (atomic_dec_and_test(&skb->users)) {
642 struct softnet_data *sd;
643 unsigned long flags;
644
645 local_irq_save(flags);
646 sd = &__get_cpu_var(softnet_data);
647 skb->next = sd->completion_queue;
648 sd->completion_queue = skb;
649 raise_softirq_irqoff(NET_TX_SOFTIRQ);
650 local_irq_restore(flags);
651 }
652}
653
654/* Use this variant in places where it could be invoked
655 * either from interrupt or non-interrupt context.
656 */
657static inline void dev_kfree_skb_any(struct sk_buff *skb)
658{
659 if (in_irq() || irqs_disabled())
660 dev_kfree_skb_irq(skb);
661 else
662 dev_kfree_skb(skb);
663}
664
665#define HAVE_NETIF_RX 1
666extern int netif_rx(struct sk_buff *skb);
667extern int netif_rx_ni(struct sk_buff *skb);
668#define HAVE_NETIF_RECEIVE_SKB 1
669extern int netif_receive_skb(struct sk_buff *skb);
670extern int dev_ioctl(unsigned int cmd, void __user *);
671extern int dev_ethtool(struct ifreq *);
672extern unsigned dev_get_flags(const struct net_device *);
673extern int dev_change_flags(struct net_device *, unsigned);
674extern int dev_change_name(struct net_device *, char *);
675extern int dev_set_mtu(struct net_device *, int);
676extern int dev_set_mac_address(struct net_device *,
677 struct sockaddr *);
678extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
679
680extern void dev_init(void);
681
682extern int netdev_nit;
683
684/* Called by rtnetlink.c:rtnl_unlock() */
685extern void netdev_run_todo(void);
686
687static inline void dev_put(struct net_device *dev)
688{
689 atomic_dec(&dev->refcnt);
690}
691
692#define __dev_put(dev) atomic_dec(&(dev)->refcnt)
693#define dev_hold(dev) atomic_inc(&(dev)->refcnt)
694
695/* Carrier loss detection, dial on demand. The functions netif_carrier_on
696 * and _off may be called from IRQ context, but it is caller
697 * who is responsible for serialization of these calls.
698 */
699
700extern void linkwatch_fire_event(struct net_device *dev);
701
702static inline int netif_carrier_ok(const struct net_device *dev)
703{
704 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
705}
706
707extern void __netdev_watchdog_up(struct net_device *dev);
708
709static inline void netif_carrier_on(struct net_device *dev)
710{
711 if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state))
712 linkwatch_fire_event(dev);
713 if (netif_running(dev))
714 __netdev_watchdog_up(dev);
715}
716
717static inline void netif_carrier_off(struct net_device *dev)
718{
719 if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state))
720 linkwatch_fire_event(dev);
721}
722
723/* Hot-plugging. */
724static inline int netif_device_present(struct net_device *dev)
725{
726 return test_bit(__LINK_STATE_PRESENT, &dev->state);
727}
728
729static inline void netif_device_detach(struct net_device *dev)
730{
731 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
732 netif_running(dev)) {
733 netif_stop_queue(dev);
734 }
735}
736
737static inline void netif_device_attach(struct net_device *dev)
738{
739 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
740 netif_running(dev)) {
741 netif_wake_queue(dev);
742 __netdev_watchdog_up(dev);
743 }
744}
745
746/*
747 * Network interface message level settings
748 */
749#define HAVE_NETIF_MSG 1
750
751enum {
752 NETIF_MSG_DRV = 0x0001,
753 NETIF_MSG_PROBE = 0x0002,
754 NETIF_MSG_LINK = 0x0004,
755 NETIF_MSG_TIMER = 0x0008,
756 NETIF_MSG_IFDOWN = 0x0010,
757 NETIF_MSG_IFUP = 0x0020,
758 NETIF_MSG_RX_ERR = 0x0040,
759 NETIF_MSG_TX_ERR = 0x0080,
760 NETIF_MSG_TX_QUEUED = 0x0100,
761 NETIF_MSG_INTR = 0x0200,
762 NETIF_MSG_TX_DONE = 0x0400,
763 NETIF_MSG_RX_STATUS = 0x0800,
764 NETIF_MSG_PKTDATA = 0x1000,
765 NETIF_MSG_HW = 0x2000,
766 NETIF_MSG_WOL = 0x4000,
767};
768
769#define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
770#define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
771#define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
772#define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
773#define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
774#define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
775#define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
776#define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
777#define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
778#define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
779#define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
780#define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
781#define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
782#define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
783#define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
784
785static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
786{
787 /* use default */
788 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
789 return default_msg_enable_bits;
790 if (debug_value == 0) /* no output */
791 return 0;
792 /* set low N bits */
793 return (1 << debug_value) - 1;
794}
795
796/* Schedule rx intr now? */
797
798static inline int netif_rx_schedule_prep(struct net_device *dev)
799{
800 return netif_running(dev) &&
801 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
802}
803
804/* Add interface to tail of rx poll list. This assumes that _prep has
805 * already been called and returned 1.
806 */
807
808static inline void __netif_rx_schedule(struct net_device *dev)
809{
810 unsigned long flags;
811
812 local_irq_save(flags);
813 dev_hold(dev);
814 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
815 if (dev->quota < 0)
816 dev->quota += dev->weight;
817 else
818 dev->quota = dev->weight;
819 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
820 local_irq_restore(flags);
821}
822
823/* Try to reschedule poll. Called by irq handler. */
824
825static inline void netif_rx_schedule(struct net_device *dev)
826{
827 if (netif_rx_schedule_prep(dev))
828 __netif_rx_schedule(dev);
829}
830
831/* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
832 * Do not inline this?
833 */
834static inline int netif_rx_reschedule(struct net_device *dev, int undo)
835{
836 if (netif_rx_schedule_prep(dev)) {
837 unsigned long flags;
838
839 dev->quota += undo;
840
841 local_irq_save(flags);
842 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
843 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
844 local_irq_restore(flags);
845 return 1;
846 }
847 return 0;
848}
849
850/* Remove interface from poll list: it must be in the poll list
851 * on current cpu. This primitive is called by dev->poll(), when
852 * it completes the work. The device cannot be out of poll list at this
853 * moment, it is BUG().
854 */
855static inline void netif_rx_complete(struct net_device *dev)
856{
857 unsigned long flags;
858
859 local_irq_save(flags);
860 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
861 list_del(&dev->poll_list);
862 smp_mb__before_clear_bit();
863 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
864 local_irq_restore(flags);
865}
866
867static inline void netif_poll_disable(struct net_device *dev)
868{
869 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
870 /* No hurry. */
871 current->state = TASK_INTERRUPTIBLE;
872 schedule_timeout(1);
873 }
874}
875
876static inline void netif_poll_enable(struct net_device *dev)
877{
878 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
879}
880
881/* same as netif_rx_complete, except that local_irq_save(flags)
882 * has already been issued
883 */
884static inline void __netif_rx_complete(struct net_device *dev)
885{
886 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
887 list_del(&dev->poll_list);
888 smp_mb__before_clear_bit();
889 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
890}
891
892static inline void netif_tx_disable(struct net_device *dev)
893{
894 spin_lock_bh(&dev->xmit_lock);
895 netif_stop_queue(dev);
896 spin_unlock_bh(&dev->xmit_lock);
897}
898
899/* These functions live elsewhere (drivers/net/net_init.c, but related) */
900
901extern void ether_setup(struct net_device *dev);
902
903/* Support for loadable net-drivers */
904extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
905 void (*setup)(struct net_device *));
906extern int register_netdev(struct net_device *dev);
907extern void unregister_netdev(struct net_device *dev);
908/* Functions used for multicast support */
909extern void dev_mc_upload(struct net_device *dev);
910extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
911extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
912extern void dev_mc_discard(struct net_device *dev);
913extern void dev_set_promiscuity(struct net_device *dev, int inc);
914extern void dev_set_allmulti(struct net_device *dev, int inc);
915extern void netdev_state_change(struct net_device *dev);
d8a33ac4 916extern void netdev_features_change(struct net_device *dev);
1da177e4
LT		 917/* Load a device via the kmod */
918extern void dev_load(const char *name);
919extern void dev_mcast_init(void);
920extern int netdev_max_backlog;
921extern int weight_p;
922extern int netdev_set_master(struct net_device *dev, struct net_device *master);
923extern int skb_checksum_help(struct sk_buff *skb, int inward);
924/* rx skb timestamps */
925extern void net_enable_timestamp(void);
926extern void net_disable_timestamp(void);
927
928#ifdef CONFIG_SYSCTL
929extern char *net_sysctl_strdup(const char *s);
930#endif
931
932#endif /* __KERNEL__ */
933
934#endif /* _LINUX_DEV_H */
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