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[NET]: Prefetch dev->qdisc_lock in dev_queue_xmit()
[net-next-2.6.git] / include / linux / netdevice.h
CommitLineData
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;
115c1d6e 44struct netpoll_info;
1da177e4
LT		 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;
1da177e4
LT		 167 unsigned cpu_collision;
168};
169
170DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
171
172
173/*
174 * We tag multicasts with these structures.
175 */
176
177struct 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
186struct 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) \
5ba0eac6 201 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
1da177e4
LT		 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
225enum 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 */
241struct netdev_boot_setup {
242 char name[IFNAMSIZ];
243 struct ifmap map;
244};
245#define NETDEV_BOOT_SETUP_MAX 8
246
20380731 247extern int __init netdev_boot_setup(char *str);
1da177e4
LT		 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
259struct 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
269 /*
270 * I/O specific fields
271 * FIXME: Merge these and struct ifmap into one
272 */
273 unsigned long mem_end; /* shared mem end */
274 unsigned long mem_start; /* shared mem start */
275 unsigned long base_addr; /* device I/O address */
276 unsigned int irq; /* device IRQ number */
277
278 /*
279 * Some hardware also needs these fields, but they are not
280 * part of the usual set specified in Space.c.
281 */
282
283 unsigned char if_port; /* Selectable AUI, TP,..*/
284 unsigned char dma; /* DMA channel */
285
286 unsigned long state;
287
288 struct net_device *next;
289
290 /* The device initialization function. Called only once. */
291 int (*init)(struct net_device *dev);
292
293 /* ------- Fields preinitialized in Space.c finish here ------- */
294
295 struct net_device *next_sched;
296
297 /* Interface index. Unique device identifier */
298 int ifindex;
299 int iflink;
300
301
302 struct net_device_stats* (*get_stats)(struct net_device *dev);
303 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev);
304
305 /* List of functions to handle Wireless Extensions (instead of ioctl).
306 * See <net/iw_handler.h> for details. Jean II */
307 const struct iw_handler_def * wireless_handlers;
308 /* Instance data managed by the core of Wireless Extensions. */
309 struct iw_public_data * wireless_data;
310
311 struct ethtool_ops *ethtool_ops;
312
313 /*
314 * This marks the end of the "visible" part of the structure. All
315 * fields hereafter are internal to the system, and may change at
316 * will (read: may be cleaned up at will).
317 */
318
319 /* These may be needed for future network-power-down code. */
320 unsigned long trans_start; /* Time (in jiffies) of last Tx */
321 unsigned long last_rx; /* Time of last Rx */
322
323 unsigned short flags; /* interface flags (a la BSD) */
324 unsigned short gflags;
325 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
326 unsigned short padded; /* How much padding added by alloc_netdev() */
327
328 unsigned mtu; /* interface MTU value */
329 unsigned short type; /* interface hardware type */
330 unsigned short hard_header_len; /* hardware hdr length */
331 void *priv; /* pointer to private data */
332
333 struct net_device *master; /* Pointer to master device of a group,
334 * which this device is member of.
335 */
336
337 /* Interface address info. */
338 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
339 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address */
a6f9a705 340 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1da177e4
LT		 341 unsigned char addr_len; /* hardware address length */
342 unsigned short dev_id; /* for shared network cards */
343
344 struct dev_mc_list *mc_list; /* Multicast mac addresses */
345 int mc_count; /* Number of installed mcasts */
346 int promiscuity;
347 int allmulti;
348
349 int watchdog_timeo;
350 struct timer_list watchdog_timer;
351
352 /* Protocol specific pointers */
353
354 void *atalk_ptr; /* AppleTalk link */
355 void *ip_ptr; /* IPv4 specific data */
356 void *dn_ptr; /* DECnet specific data */
357 void *ip6_ptr; /* IPv6 specific data */
358 void *ec_ptr; /* Econet specific data */
359 void *ax25_ptr; /* AX.25 specific data */
360
361 struct list_head poll_list; /* Link to poll list */
362 int quota;
363 int weight;
364
365 struct Qdisc *qdisc;
366 struct Qdisc *qdisc_sleeping;
367 struct Qdisc *qdisc_ingress;
368 struct list_head qdisc_list;
369 unsigned long tx_queue_len; /* Max frames per queue allowed */
370
371 /* ingress path synchronizer */
372 spinlock_t ingress_lock;
373 /* hard_start_xmit synchronizer */
374 spinlock_t xmit_lock;
375 /* cpu id of processor entered to hard_start_xmit or -1,
376 if nobody entered there.
377 */
378 int xmit_lock_owner;
379 /* device queue lock */
380 spinlock_t queue_lock;
381 /* Number of references to this device */
382 atomic_t refcnt;
383 /* delayed register/unregister */
384 struct list_head todo_list;
385 /* device name hash chain */
386 struct hlist_node name_hlist;
387 /* device index hash chain */
388 struct hlist_node index_hlist;
389
390 /* register/unregister state machine */
391 enum { NETREG_UNINITIALIZED=0,
392 NETREG_REGISTERING, /* called register_netdevice */
393 NETREG_REGISTERED, /* completed register todo */
394 NETREG_UNREGISTERING, /* called unregister_netdevice */
395 NETREG_UNREGISTERED, /* completed unregister todo */
396 NETREG_RELEASED, /* called free_netdev */
397 } reg_state;
398
399 /* Net device features */
81e81575 400 unsigned long features;
1da177e4
LT		 401#define NETIF_F_SG 1 /* Scatter/gather IO. */
402#define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
403#define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
404#define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
405#define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
406#define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
407#define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
408#define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
409#define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
410#define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
411#define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */
412#define NETIF_F_LLTX 4096 /* LockLess TX */
413
414 /* Called after device is detached from network. */
415 void (*uninit)(struct net_device *dev);
416 /* Called after last user reference disappears. */
417 void (*destructor)(struct net_device *dev);
418
419 /* Pointers to interface service routines. */
420 int (*open)(struct net_device *dev);
421 int (*stop)(struct net_device *dev);
422 int (*hard_start_xmit) (struct sk_buff *skb,
423 struct net_device *dev);
424#define HAVE_NETDEV_POLL
425 int (*poll) (struct net_device *dev, int *quota);
426 int (*hard_header) (struct sk_buff *skb,
427 struct net_device *dev,
428 unsigned short type,
429 void *daddr,
430 void *saddr,
431 unsigned len);
432 int (*rebuild_header)(struct sk_buff *skb);
433#define HAVE_MULTICAST
434 void (*set_multicast_list)(struct net_device *dev);
435#define HAVE_SET_MAC_ADDR
436 int (*set_mac_address)(struct net_device *dev,
437 void *addr);
438#define HAVE_PRIVATE_IOCTL
439 int (*do_ioctl)(struct net_device *dev,
440 struct ifreq *ifr, int cmd);
441#define HAVE_SET_CONFIG
442 int (*set_config)(struct net_device *dev,
443 struct ifmap *map);
444#define HAVE_HEADER_CACHE
445 int (*hard_header_cache)(struct neighbour *neigh,
446 struct hh_cache *hh);
447 void (*header_cache_update)(struct hh_cache *hh,
448 struct net_device *dev,
449 unsigned char * haddr);
450#define HAVE_CHANGE_MTU
451 int (*change_mtu)(struct net_device *dev, int new_mtu);
452
453#define HAVE_TX_TIMEOUT
454 void (*tx_timeout) (struct net_device *dev);
455
456 void (*vlan_rx_register)(struct net_device *dev,
457 struct vlan_group *grp);
458 void (*vlan_rx_add_vid)(struct net_device *dev,
459 unsigned short vid);
460 void (*vlan_rx_kill_vid)(struct net_device *dev,
461 unsigned short vid);
462
463 int (*hard_header_parse)(struct sk_buff *skb,
464 unsigned char *haddr);
465 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
466#ifdef CONFIG_NETPOLL
115c1d6e 467 struct netpoll_info *npinfo;
1da177e4
LT		 468#endif
469#ifdef CONFIG_NET_POLL_CONTROLLER
470 void (*poll_controller)(struct net_device *dev);
471#endif
472
473 /* bridge stuff */
474 struct net_bridge_port *br_port;
475
476#ifdef CONFIG_NET_DIVERT
477 /* this will get initialized at each interface type init routine */
478 struct divert_blk *divert;
479#endif /* CONFIG_NET_DIVERT */
480
481 /* class/net/name entry */
482 struct class_device class_dev;
483};
484
485#define NETDEV_ALIGN 32
486#define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
487
488static inline void *netdev_priv(struct net_device *dev)
489{
490 return (char *)dev + ((sizeof(struct net_device)
491 + NETDEV_ALIGN_CONST)
492 & ~NETDEV_ALIGN_CONST);
493}
494
495#define SET_MODULE_OWNER(dev) do { } while (0)
496/* Set the sysfs physical device reference for the network logical device
497 * if set prior to registration will cause a symlink during initialization.
498 */
499#define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev))
500
501struct packet_type {
f2ccd8fa
DM		 502 __be16 type; /* This is really htons(ether_type). */
503 struct net_device *dev; /* NULL is wildcarded here */
504 int (*func) (struct sk_buff *,
505 struct net_device *,
506 struct packet_type *,
507 struct net_device *);
1da177e4
LT		 508 void *af_packet_priv;
509 struct list_head list;
510};
511
512#include <linux/interrupt.h>
513#include <linux/notifier.h>
514
515extern struct net_device loopback_dev; /* The loopback */
516extern struct net_device *dev_base; /* All devices */
517extern rwlock_t dev_base_lock; /* Device list lock */
518
519extern int netdev_boot_setup_check(struct net_device *dev);
520extern unsigned long netdev_boot_base(const char *prefix, int unit);
521extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr);
522extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
523extern void dev_add_pack(struct packet_type *pt);
524extern void dev_remove_pack(struct packet_type *pt);
525extern void __dev_remove_pack(struct packet_type *pt);
526
527extern struct net_device *dev_get_by_flags(unsigned short flags,
528 unsigned short mask);
529extern struct net_device *dev_get_by_name(const char *name);
530extern struct net_device *__dev_get_by_name(const char *name);
531extern int dev_alloc_name(struct net_device *dev, const char *name);
532extern int dev_open(struct net_device *dev);
533extern int dev_close(struct net_device *dev);
534extern int dev_queue_xmit(struct sk_buff *skb);
535extern int register_netdevice(struct net_device *dev);
536extern int unregister_netdevice(struct net_device *dev);
537extern void free_netdev(struct net_device *dev);
538extern void synchronize_net(void);
539extern int register_netdevice_notifier(struct notifier_block *nb);
540extern int unregister_netdevice_notifier(struct notifier_block *nb);
541extern int call_netdevice_notifiers(unsigned long val, void *v);
542extern struct net_device *dev_get_by_index(int ifindex);
543extern struct net_device *__dev_get_by_index(int ifindex);
544extern int dev_restart(struct net_device *dev);
545#ifdef CONFIG_NETPOLL_TRAP
546extern int netpoll_trap(void);
547#endif
548
549typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
550extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
551static inline int unregister_gifconf(unsigned int family)
552{
553 return register_gifconf(family, NULL);
554}
555
556/*
557 * Incoming packets are placed on per-cpu queues so that
558 * no locking is needed.
559 */
560
561struct softnet_data
562{
31aa02c5 563 struct net_device *output_queue;
1da177e4
LT		 564 struct sk_buff_head input_pkt_queue;
565 struct list_head poll_list;
1da177e4
LT		 566 struct sk_buff *completion_queue;
567
568 struct net_device backlog_dev; /* Sorry. 8) */
569};
570
571DECLARE_PER_CPU(struct softnet_data,softnet_data);
572
573#define HAVE_NETIF_QUEUE
574
575static inline void __netif_schedule(struct net_device *dev)
576{
577 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
578 unsigned long flags;
579 struct softnet_data *sd;
580
581 local_irq_save(flags);
582 sd = &__get_cpu_var(softnet_data);
583 dev->next_sched = sd->output_queue;
584 sd->output_queue = dev;
585 raise_softirq_irqoff(NET_TX_SOFTIRQ);
586 local_irq_restore(flags);
587 }
588}
589
590static inline void netif_schedule(struct net_device *dev)
591{
592 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
593 __netif_schedule(dev);
594}
595
596static inline void netif_start_queue(struct net_device *dev)
597{
598 clear_bit(__LINK_STATE_XOFF, &dev->state);
599}
600
601static inline void netif_wake_queue(struct net_device *dev)
602{
603#ifdef CONFIG_NETPOLL_TRAP
604 if (netpoll_trap())
605 return;
606#endif
607 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
608 __netif_schedule(dev);
609}
610
611static inline void netif_stop_queue(struct net_device *dev)
612{
613#ifdef CONFIG_NETPOLL_TRAP
614 if (netpoll_trap())
615 return;
616#endif
617 set_bit(__LINK_STATE_XOFF, &dev->state);
618}
619
620static inline int netif_queue_stopped(const struct net_device *dev)
621{
622 return test_bit(__LINK_STATE_XOFF, &dev->state);
623}
624
625static inline int netif_running(const struct net_device *dev)
626{
627 return test_bit(__LINK_STATE_START, &dev->state);
628}
629
630
631/* Use this variant when it is known for sure that it
632 * is executing from interrupt context.
633 */
634static inline void dev_kfree_skb_irq(struct sk_buff *skb)
635{
636 if (atomic_dec_and_test(&skb->users)) {
637 struct softnet_data *sd;
638 unsigned long flags;
639
640 local_irq_save(flags);
641 sd = &__get_cpu_var(softnet_data);
642 skb->next = sd->completion_queue;
643 sd->completion_queue = skb;
644 raise_softirq_irqoff(NET_TX_SOFTIRQ);
645 local_irq_restore(flags);
646 }
647}
648
649/* Use this variant in places where it could be invoked
650 * either from interrupt or non-interrupt context.
651 */
652static inline void dev_kfree_skb_any(struct sk_buff *skb)
653{
654 if (in_irq() || irqs_disabled())
655 dev_kfree_skb_irq(skb);
656 else
657 dev_kfree_skb(skb);
658}
659
660#define HAVE_NETIF_RX 1
661extern int netif_rx(struct sk_buff *skb);
662extern int netif_rx_ni(struct sk_buff *skb);
663#define HAVE_NETIF_RECEIVE_SKB 1
664extern int netif_receive_skb(struct sk_buff *skb);
665extern int dev_ioctl(unsigned int cmd, void __user *);
666extern int dev_ethtool(struct ifreq *);
667extern unsigned dev_get_flags(const struct net_device *);
668extern int dev_change_flags(struct net_device *, unsigned);
669extern int dev_change_name(struct net_device *, char *);
670extern int dev_set_mtu(struct net_device *, int);
671extern int dev_set_mac_address(struct net_device *,
672 struct sockaddr *);
673extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
674
675extern void dev_init(void);
676
677extern int netdev_nit;
20380731 678extern int netdev_budget;
1da177e4
LT		 679
680/* Called by rtnetlink.c:rtnl_unlock() */
681extern void netdev_run_todo(void);
682
683static inline void dev_put(struct net_device *dev)
684{
685 atomic_dec(&dev->refcnt);
686}
687
688#define __dev_put(dev) atomic_dec(&(dev)->refcnt)
689#define dev_hold(dev) atomic_inc(&(dev)->refcnt)
690
691/* Carrier loss detection, dial on demand. The functions netif_carrier_on
692 * and _off may be called from IRQ context, but it is caller
693 * who is responsible for serialization of these calls.
694 */
695
696extern void linkwatch_fire_event(struct net_device *dev);
697
698static inline int netif_carrier_ok(const struct net_device *dev)
699{
700 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
701}
702
703extern void __netdev_watchdog_up(struct net_device *dev);
704
0a242efc 705extern void netif_carrier_on(struct net_device *dev);
1da177e4 706
0a242efc 707extern void netif_carrier_off(struct net_device *dev);
1da177e4
LT		 708
709/* Hot-plugging. */
710static inline int netif_device_present(struct net_device *dev)
711{
712 return test_bit(__LINK_STATE_PRESENT, &dev->state);
713}
714
715static inline void netif_device_detach(struct net_device *dev)
716{
717 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
718 netif_running(dev)) {
719 netif_stop_queue(dev);
720 }
721}
722
723static inline void netif_device_attach(struct net_device *dev)
724{
725 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
726 netif_running(dev)) {
727 netif_wake_queue(dev);
728 __netdev_watchdog_up(dev);
729 }
730}
731
732/*
733 * Network interface message level settings
734 */
735#define HAVE_NETIF_MSG 1
736
737enum {
738 NETIF_MSG_DRV = 0x0001,
739 NETIF_MSG_PROBE = 0x0002,
740 NETIF_MSG_LINK = 0x0004,
741 NETIF_MSG_TIMER = 0x0008,
742 NETIF_MSG_IFDOWN = 0x0010,
743 NETIF_MSG_IFUP = 0x0020,
744 NETIF_MSG_RX_ERR = 0x0040,
745 NETIF_MSG_TX_ERR = 0x0080,
746 NETIF_MSG_TX_QUEUED = 0x0100,
747 NETIF_MSG_INTR = 0x0200,
748 NETIF_MSG_TX_DONE = 0x0400,
749 NETIF_MSG_RX_STATUS = 0x0800,
750 NETIF_MSG_PKTDATA = 0x1000,
751 NETIF_MSG_HW = 0x2000,
752 NETIF_MSG_WOL = 0x4000,
753};
754
755#define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
756#define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
757#define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
758#define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
759#define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
760#define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
761#define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
762#define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
763#define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
764#define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
765#define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
766#define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
767#define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
768#define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
769#define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
770
771static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
772{
773 /* use default */
774 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
775 return default_msg_enable_bits;
776 if (debug_value == 0) /* no output */
777 return 0;
778 /* set low N bits */
779 return (1 << debug_value) - 1;
780}
781
782/* Schedule rx intr now? */
783
784static inline int netif_rx_schedule_prep(struct net_device *dev)
785{
786 return netif_running(dev) &&
787 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
788}
789
790/* Add interface to tail of rx poll list. This assumes that _prep has
791 * already been called and returned 1.
792 */
793
794static inline void __netif_rx_schedule(struct net_device *dev)
795{
796 unsigned long flags;
797
798 local_irq_save(flags);
799 dev_hold(dev);
800 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
801 if (dev->quota < 0)
802 dev->quota += dev->weight;
803 else
804 dev->quota = dev->weight;
805 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
806 local_irq_restore(flags);
807}
808
809/* Try to reschedule poll. Called by irq handler. */
810
811static inline void netif_rx_schedule(struct net_device *dev)
812{
813 if (netif_rx_schedule_prep(dev))
814 __netif_rx_schedule(dev);
815}
816
817/* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
818 * Do not inline this?
819 */
820static inline int netif_rx_reschedule(struct net_device *dev, int undo)
821{
822 if (netif_rx_schedule_prep(dev)) {
823 unsigned long flags;
824
825 dev->quota += undo;
826
827 local_irq_save(flags);
828 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
829 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
830 local_irq_restore(flags);
831 return 1;
832 }
833 return 0;
834}
835
836/* Remove interface from poll list: it must be in the poll list
837 * on current cpu. This primitive is called by dev->poll(), when
838 * it completes the work. The device cannot be out of poll list at this
839 * moment, it is BUG().
840 */
841static inline void netif_rx_complete(struct net_device *dev)
842{
843 unsigned long flags;
844
845 local_irq_save(flags);
846 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
847 list_del(&dev->poll_list);
848 smp_mb__before_clear_bit();
849 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
850 local_irq_restore(flags);
851}
852
853static inline void netif_poll_disable(struct net_device *dev)
854{
855 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
856 /* No hurry. */
857 current->state = TASK_INTERRUPTIBLE;
858 schedule_timeout(1);
859 }
860}
861
862static inline void netif_poll_enable(struct net_device *dev)
863{
864 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
865}
866
867/* same as netif_rx_complete, except that local_irq_save(flags)
868 * has already been issued
869 */
870static inline void __netif_rx_complete(struct net_device *dev)
871{
872 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
873 list_del(&dev->poll_list);
874 smp_mb__before_clear_bit();
875 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
876}
877
878static inline void netif_tx_disable(struct net_device *dev)
879{
880 spin_lock_bh(&dev->xmit_lock);
881 netif_stop_queue(dev);
882 spin_unlock_bh(&dev->xmit_lock);
883}
884
885/* These functions live elsewhere (drivers/net/net_init.c, but related) */
886
887extern void ether_setup(struct net_device *dev);
888
889/* Support for loadable net-drivers */
890extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
891 void (*setup)(struct net_device *));
892extern int register_netdev(struct net_device *dev);
893extern void unregister_netdev(struct net_device *dev);
894/* Functions used for multicast support */
895extern void dev_mc_upload(struct net_device *dev);
896extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
897extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
898extern void dev_mc_discard(struct net_device *dev);
899extern void dev_set_promiscuity(struct net_device *dev, int inc);
900extern void dev_set_allmulti(struct net_device *dev, int inc);
901extern void netdev_state_change(struct net_device *dev);
d8a33ac4 902extern void netdev_features_change(struct net_device *dev);
1da177e4
LT		 903/* Load a device via the kmod */
904extern void dev_load(const char *name);
905extern void dev_mcast_init(void);
906extern int netdev_max_backlog;
907extern int weight_p;
908extern int netdev_set_master(struct net_device *dev, struct net_device *master);
909extern int skb_checksum_help(struct sk_buff *skb, int inward);
910/* rx skb timestamps */
911extern void net_enable_timestamp(void);
912extern void net_disable_timestamp(void);
913
20380731
ACM		 914#ifdef CONFIG_PROC_FS
915extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
916extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
917extern void dev_seq_stop(struct seq_file *seq, void *v);
918#endif
919
920extern void linkwatch_run_queue(void);
921
1da177e4
LT		 922#endif /* __KERNEL__ */
923
924#endif /* _LINUX_DEV_H */
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