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[mirror_ubuntu-artful-kernel.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
1da177e4
LT		 37#include <linux/device.h>
38#include <linux/percpu.h>
db217334 39#include <linux/dmaengine.h>
1da177e4
LT		 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,
b00055aa
SR		 233 __LINK_STATE_LINKWATCH_PENDING,
234 __LINK_STATE_DORMANT,
48d83325 235 __LINK_STATE_QDISC_RUNNING,
1da177e4
LT		 236};
237
238
239/*
240 * This structure holds at boot time configured netdevice settings. They
241 * are then used in the device probing.
242 */
243struct netdev_boot_setup {
244 char name[IFNAMSIZ];
245 struct ifmap map;
246};
247#define NETDEV_BOOT_SETUP_MAX 8
248
20380731 249extern int __init netdev_boot_setup(char *str);
1da177e4
LT		 250
251/*
252 * The DEVICE structure.
253 * Actually, this whole structure is a big mistake. It mixes I/O
254 * data with strictly "high-level" data, and it has to know about
255 * almost every data structure used in the INET module.
256 *
257 * FIXME: cleanup struct net_device such that network protocol info
258 * moves out.
259 */
260
261struct net_device
262{
263
264 /*
265 * This is the first field of the "visible" part of this structure
266 * (i.e. as seen by users in the "Space.c" file). It is the name
267 * the interface.
268 */
269 char name[IFNAMSIZ];
9356b8fc
ED		 270 /* device name hash chain */
271 struct hlist_node name_hlist;
1da177e4
LT		 272
273 /*
274 * I/O specific fields
275 * FIXME: Merge these and struct ifmap into one
276 */
277 unsigned long mem_end; /* shared mem end */
278 unsigned long mem_start; /* shared mem start */
279 unsigned long base_addr; /* device I/O address */
280 unsigned int irq; /* device IRQ number */
281
282 /*
283 * Some hardware also needs these fields, but they are not
284 * part of the usual set specified in Space.c.
285 */
286
287 unsigned char if_port; /* Selectable AUI, TP,..*/
288 unsigned char dma; /* DMA channel */
289
290 unsigned long state;
291
292 struct net_device *next;
293
294 /* The device initialization function. Called only once. */
295 int (*init)(struct net_device *dev);
296
297 /* ------- Fields preinitialized in Space.c finish here ------- */
298
9356b8fc
ED		 299 /* Net device features */
300 unsigned long features;
301#define NETIF_F_SG 1 /* Scatter/gather IO. */
302#define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
303#define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
304#define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
305#define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
306#define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
307#define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
308#define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
309#define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
310#define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
37c3185a 311#define NETIF_F_GSO 2048 /* Enable software GSO. */
9356b8fc 312#define NETIF_F_LLTX 4096 /* LockLess TX */
7967168c
HX		 313
314 /* Segmentation offload features */
315#define NETIF_F_GSO_SHIFT 16
316#define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
317#define NETIF_F_UFO (SKB_GSO_UDPV4 << NETIF_F_GSO_SHIFT)
576a30eb 318#define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
9356b8fc 319
8648b305
HX		 320#define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
321#define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
322
1da177e4
LT		 323 struct net_device *next_sched;
324
325 /* Interface index. Unique device identifier */
326 int ifindex;
327 int iflink;
328
329
330 struct net_device_stats* (*get_stats)(struct net_device *dev);
331 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev);
332
333 /* List of functions to handle Wireless Extensions (instead of ioctl).
334 * See <net/iw_handler.h> for details. Jean II */
335 const struct iw_handler_def * wireless_handlers;
336 /* Instance data managed by the core of Wireless Extensions. */
337 struct iw_public_data * wireless_data;
338
339 struct ethtool_ops *ethtool_ops;
340
341 /*
342 * This marks the end of the "visible" part of the structure. All
343 * fields hereafter are internal to the system, and may change at
344 * will (read: may be cleaned up at will).
345 */
346
1da177e4 347
b00055aa 348 unsigned int flags; /* interface flags (a la BSD) */
1da177e4
LT		 349 unsigned short gflags;
350 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
351 unsigned short padded; /* How much padding added by alloc_netdev() */
352
b00055aa
SR		 353 unsigned char operstate; /* RFC2863 operstate */
354 unsigned char link_mode; /* mapping policy to operstate */
355
1da177e4
LT		 356 unsigned mtu; /* interface MTU value */
357 unsigned short type; /* interface hardware type */
358 unsigned short hard_header_len; /* hardware hdr length */
1da177e4
LT		 359
360 struct net_device *master; /* Pointer to master device of a group,
361 * which this device is member of.
362 */
363
364 /* Interface address info. */
a6f9a705 365 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1da177e4
LT		 366 unsigned char addr_len; /* hardware address length */
367 unsigned short dev_id; /* for shared network cards */
368
369 struct dev_mc_list *mc_list; /* Multicast mac addresses */
370 int mc_count; /* Number of installed mcasts */
371 int promiscuity;
372 int allmulti;
373
1da177e4
LT		 374
375 /* Protocol specific pointers */
376
377 void *atalk_ptr; /* AppleTalk link */
378 void *ip_ptr; /* IPv4 specific data */
379 void *dn_ptr; /* DECnet specific data */
380 void *ip6_ptr; /* IPv6 specific data */
381 void *ec_ptr; /* Econet specific data */
382 void *ax25_ptr; /* AX.25 specific data */
383
9356b8fc
ED		 384/*
385 * Cache line mostly used on receive path (including eth_type_trans())
386 */
387 struct list_head poll_list ____cacheline_aligned_in_smp;
388 /* Link to poll list */
389
390 int (*poll) (struct net_device *dev, int *quota);
1da177e4
LT		 391 int quota;
392 int weight;
9356b8fc
ED		 393 unsigned long last_rx; /* Time of last Rx */
394 /* Interface address info used in eth_type_trans() */
395 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
396 because most packets are unicast) */
397
398 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
1da177e4 399
9356b8fc
ED		 400/*
401 * Cache line mostly used on queue transmit path (qdisc)
402 */
403 /* device queue lock */
404 spinlock_t queue_lock ____cacheline_aligned_in_smp;
1da177e4
LT		 405 struct Qdisc *qdisc;
406 struct Qdisc *qdisc_sleeping;
1da177e4
LT		 407 struct list_head qdisc_list;
408 unsigned long tx_queue_len; /* Max frames per queue allowed */
409
f6a78bfc
HX		 410 /* Partially transmitted GSO packet. */
411 struct sk_buff *gso_skb;
412
1da177e4
LT		 413 /* ingress path synchronizer */
414 spinlock_t ingress_lock;
9356b8fc
ED		 415 struct Qdisc *qdisc_ingress;
416
417/*
418 * One part is mostly used on xmit path (device)
419 */
1da177e4 420 /* hard_start_xmit synchronizer */
932ff279 421 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
1da177e4
LT		 422 /* cpu id of processor entered to hard_start_xmit or -1,
423 if nobody entered there.
424 */
425 int xmit_lock_owner;
9356b8fc
ED		 426 void *priv; /* pointer to private data */
427 int (*hard_start_xmit) (struct sk_buff *skb,
428 struct net_device *dev);
429 /* These may be needed for future network-power-down code. */
430 unsigned long trans_start; /* Time (in jiffies) of last Tx */
431
432 int watchdog_timeo; /* used by dev_watchdog() */
433 struct timer_list watchdog_timer;
434
435/*
436 * refcnt is a very hot point, so align it on SMP
437 */
1da177e4 438 /* Number of references to this device */
9356b8fc
ED		 439 atomic_t refcnt ____cacheline_aligned_in_smp;
440
1da177e4
LT		 441 /* delayed register/unregister */
442 struct list_head todo_list;
1da177e4
LT		 443 /* device index hash chain */
444 struct hlist_node index_hlist;
445
446 /* register/unregister state machine */
447 enum { NETREG_UNINITIALIZED=0,
b17a7c17 448 NETREG_REGISTERED, /* completed register_netdevice */
1da177e4
LT		 449 NETREG_UNREGISTERING, /* called unregister_netdevice */
450 NETREG_UNREGISTERED, /* completed unregister todo */
451 NETREG_RELEASED, /* called free_netdev */
452 } reg_state;
453
1da177e4
LT		 454 /* Called after device is detached from network. */
455 void (*uninit)(struct net_device *dev);
456 /* Called after last user reference disappears. */
457 void (*destructor)(struct net_device *dev);
458
459 /* Pointers to interface service routines. */
460 int (*open)(struct net_device *dev);
461 int (*stop)(struct net_device *dev);
1da177e4 462#define HAVE_NETDEV_POLL
1da177e4
LT		 463 int (*hard_header) (struct sk_buff *skb,
464 struct net_device *dev,
465 unsigned short type,
466 void *daddr,
467 void *saddr,
468 unsigned len);
469 int (*rebuild_header)(struct sk_buff *skb);
470#define HAVE_MULTICAST
471 void (*set_multicast_list)(struct net_device *dev);
472#define HAVE_SET_MAC_ADDR
473 int (*set_mac_address)(struct net_device *dev,
474 void *addr);
475#define HAVE_PRIVATE_IOCTL
476 int (*do_ioctl)(struct net_device *dev,
477 struct ifreq *ifr, int cmd);
478#define HAVE_SET_CONFIG
479 int (*set_config)(struct net_device *dev,
480 struct ifmap *map);
481#define HAVE_HEADER_CACHE
482 int (*hard_header_cache)(struct neighbour *neigh,
483 struct hh_cache *hh);
484 void (*header_cache_update)(struct hh_cache *hh,
485 struct net_device *dev,
486 unsigned char * haddr);
487#define HAVE_CHANGE_MTU
488 int (*change_mtu)(struct net_device *dev, int new_mtu);
489
490#define HAVE_TX_TIMEOUT
491 void (*tx_timeout) (struct net_device *dev);
492
493 void (*vlan_rx_register)(struct net_device *dev,
494 struct vlan_group *grp);
495 void (*vlan_rx_add_vid)(struct net_device *dev,
496 unsigned short vid);
497 void (*vlan_rx_kill_vid)(struct net_device *dev,
498 unsigned short vid);
499
500 int (*hard_header_parse)(struct sk_buff *skb,
501 unsigned char *haddr);
502 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
503#ifdef CONFIG_NETPOLL
115c1d6e 504 struct netpoll_info *npinfo;
1da177e4
LT		 505#endif
506#ifdef CONFIG_NET_POLL_CONTROLLER
507 void (*poll_controller)(struct net_device *dev);
508#endif
509
510 /* bridge stuff */
511 struct net_bridge_port *br_port;
512
513#ifdef CONFIG_NET_DIVERT
514 /* this will get initialized at each interface type init routine */
515 struct divert_blk *divert;
516#endif /* CONFIG_NET_DIVERT */
517
518 /* class/net/name entry */
519 struct class_device class_dev;
fe9925b5
SH		 520 /* space for optional statistics and wireless sysfs groups */
521 struct attribute_group *sysfs_groups[3];
1da177e4
LT		 522};
523
524#define NETDEV_ALIGN 32
525#define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
526
527static inline void *netdev_priv(struct net_device *dev)
528{
529 return (char *)dev + ((sizeof(struct net_device)
530 + NETDEV_ALIGN_CONST)
531 & ~NETDEV_ALIGN_CONST);
532}
533
534#define SET_MODULE_OWNER(dev) do { } while (0)
535/* Set the sysfs physical device reference for the network logical device
536 * if set prior to registration will cause a symlink during initialization.
537 */
538#define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev))
539
540struct packet_type {
f2ccd8fa
DM		 541 __be16 type; /* This is really htons(ether_type). */
542 struct net_device *dev; /* NULL is wildcarded here */
543 int (*func) (struct sk_buff *,
544 struct net_device *,
545 struct packet_type *,
546 struct net_device *);
576a30eb
HX		 547 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
548 int features);
1da177e4
LT		 549 void *af_packet_priv;
550 struct list_head list;
551};
552
553#include <linux/interrupt.h>
554#include <linux/notifier.h>
555
556extern struct net_device loopback_dev; /* The loopback */
557extern struct net_device *dev_base; /* All devices */
558extern rwlock_t dev_base_lock; /* Device list lock */
559
560extern int netdev_boot_setup_check(struct net_device *dev);
561extern unsigned long netdev_boot_base(const char *prefix, int unit);
562extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr);
563extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
564extern void dev_add_pack(struct packet_type *pt);
565extern void dev_remove_pack(struct packet_type *pt);
566extern void __dev_remove_pack(struct packet_type *pt);
567
568extern struct net_device *dev_get_by_flags(unsigned short flags,
569 unsigned short mask);
570extern struct net_device *dev_get_by_name(const char *name);
571extern struct net_device *__dev_get_by_name(const char *name);
572extern int dev_alloc_name(struct net_device *dev, const char *name);
573extern int dev_open(struct net_device *dev);
574extern int dev_close(struct net_device *dev);
575extern int dev_queue_xmit(struct sk_buff *skb);
576extern int register_netdevice(struct net_device *dev);
577extern int unregister_netdevice(struct net_device *dev);
578extern void free_netdev(struct net_device *dev);
579extern void synchronize_net(void);
580extern int register_netdevice_notifier(struct notifier_block *nb);
581extern int unregister_netdevice_notifier(struct notifier_block *nb);
582extern int call_netdevice_notifiers(unsigned long val, void *v);
583extern struct net_device *dev_get_by_index(int ifindex);
584extern struct net_device *__dev_get_by_index(int ifindex);
585extern int dev_restart(struct net_device *dev);
586#ifdef CONFIG_NETPOLL_TRAP
587extern int netpoll_trap(void);
588#endif
589
590typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
591extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
592static inline int unregister_gifconf(unsigned int family)
593{
594 return register_gifconf(family, NULL);
595}
596
597/*
598 * Incoming packets are placed on per-cpu queues so that
599 * no locking is needed.
600 */
601
602struct softnet_data
603{
31aa02c5 604 struct net_device *output_queue;
1da177e4
LT		 605 struct sk_buff_head input_pkt_queue;
606 struct list_head poll_list;
1da177e4
LT		 607 struct sk_buff *completion_queue;
608
609 struct net_device backlog_dev; /* Sorry. 8) */
db217334
CL		 610#ifdef CONFIG_NET_DMA
611 struct dma_chan *net_dma;
612#endif
1da177e4
LT		 613};
614
615DECLARE_PER_CPU(struct softnet_data,softnet_data);
616
617#define HAVE_NETIF_QUEUE
618
56079431 619extern void __netif_schedule(struct net_device *dev);
1da177e4
LT		 620
621static inline void netif_schedule(struct net_device *dev)
622{
623 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
624 __netif_schedule(dev);
625}
626
627static inline void netif_start_queue(struct net_device *dev)
628{
629 clear_bit(__LINK_STATE_XOFF, &dev->state);
630}
631
632static inline void netif_wake_queue(struct net_device *dev)
633{
634#ifdef CONFIG_NETPOLL_TRAP
635 if (netpoll_trap())
636 return;
637#endif
638 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
639 __netif_schedule(dev);
640}
641
642static inline void netif_stop_queue(struct net_device *dev)
643{
644#ifdef CONFIG_NETPOLL_TRAP
645 if (netpoll_trap())
646 return;
647#endif
648 set_bit(__LINK_STATE_XOFF, &dev->state);
649}
650
651static inline int netif_queue_stopped(const struct net_device *dev)
652{
653 return test_bit(__LINK_STATE_XOFF, &dev->state);
654}
655
656static inline int netif_running(const struct net_device *dev)
657{
658 return test_bit(__LINK_STATE_START, &dev->state);
659}
660
661
662/* Use this variant when it is known for sure that it
663 * is executing from interrupt context.
664 */
665static inline void dev_kfree_skb_irq(struct sk_buff *skb)
666{
667 if (atomic_dec_and_test(&skb->users)) {
668 struct softnet_data *sd;
669 unsigned long flags;
670
671 local_irq_save(flags);
672 sd = &__get_cpu_var(softnet_data);
673 skb->next = sd->completion_queue;
674 sd->completion_queue = skb;
675 raise_softirq_irqoff(NET_TX_SOFTIRQ);
676 local_irq_restore(flags);
677 }
678}
679
680/* Use this variant in places where it could be invoked
681 * either from interrupt or non-interrupt context.
682 */
56079431 683extern void dev_kfree_skb_any(struct sk_buff *skb);
1da177e4
LT		 684
685#define HAVE_NETIF_RX 1
686extern int netif_rx(struct sk_buff *skb);
687extern int netif_rx_ni(struct sk_buff *skb);
688#define HAVE_NETIF_RECEIVE_SKB 1
689extern int netif_receive_skb(struct sk_buff *skb);
c2373ee9 690extern int dev_valid_name(const char *name);
1da177e4
LT		 691extern int dev_ioctl(unsigned int cmd, void __user *);
692extern int dev_ethtool(struct ifreq *);
693extern unsigned dev_get_flags(const struct net_device *);
694extern int dev_change_flags(struct net_device *, unsigned);
695extern int dev_change_name(struct net_device *, char *);
696extern int dev_set_mtu(struct net_device *, int);
697extern int dev_set_mac_address(struct net_device *,
698 struct sockaddr *);
f6a78bfc
HX		 699extern int dev_hard_start_xmit(struct sk_buff *skb,
700 struct net_device *dev);
1da177e4
LT		 701
702extern void dev_init(void);
703
20380731 704extern int netdev_budget;
1da177e4
LT		 705
706/* Called by rtnetlink.c:rtnl_unlock() */
707extern void netdev_run_todo(void);
708
709static inline void dev_put(struct net_device *dev)
710{
711 atomic_dec(&dev->refcnt);
712}
713
15333061
SH		 714static inline void dev_hold(struct net_device *dev)
715{
716 atomic_inc(&dev->refcnt);
717}
1da177e4
LT		 718
719/* Carrier loss detection, dial on demand. The functions netif_carrier_on
720 * and _off may be called from IRQ context, but it is caller
721 * who is responsible for serialization of these calls.
b00055aa
SR		 722 *
723 * The name carrier is inappropriate, these functions should really be
724 * called netif_lowerlayer_*() because they represent the state of any
725 * kind of lower layer not just hardware media.
1da177e4
LT		 726 */
727
728extern void linkwatch_fire_event(struct net_device *dev);
729
730static inline int netif_carrier_ok(const struct net_device *dev)
731{
732 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
733}
734
735extern void __netdev_watchdog_up(struct net_device *dev);
736
0a242efc 737extern void netif_carrier_on(struct net_device *dev);
1da177e4 738
0a242efc 739extern void netif_carrier_off(struct net_device *dev);
1da177e4 740
b00055aa
SR		 741static inline void netif_dormant_on(struct net_device *dev)
742{
743 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
744 linkwatch_fire_event(dev);
745}
746
747static inline void netif_dormant_off(struct net_device *dev)
748{
749 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
750 linkwatch_fire_event(dev);
751}
752
753static inline int netif_dormant(const struct net_device *dev)
754{
755 return test_bit(__LINK_STATE_DORMANT, &dev->state);
756}
757
758
759static inline int netif_oper_up(const struct net_device *dev) {
760 return (dev->operstate == IF_OPER_UP ||
761 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
762}
763
1da177e4
LT		 764/* Hot-plugging. */
765static inline int netif_device_present(struct net_device *dev)
766{
767 return test_bit(__LINK_STATE_PRESENT, &dev->state);
768}
769
56079431 770extern void netif_device_detach(struct net_device *dev);
1da177e4 771
56079431 772extern void netif_device_attach(struct net_device *dev);
1da177e4
LT		 773
774/*
775 * Network interface message level settings
776 */
777#define HAVE_NETIF_MSG 1
778
779enum {
780 NETIF_MSG_DRV = 0x0001,
781 NETIF_MSG_PROBE = 0x0002,
782 NETIF_MSG_LINK = 0x0004,
783 NETIF_MSG_TIMER = 0x0008,
784 NETIF_MSG_IFDOWN = 0x0010,
785 NETIF_MSG_IFUP = 0x0020,
786 NETIF_MSG_RX_ERR = 0x0040,
787 NETIF_MSG_TX_ERR = 0x0080,
788 NETIF_MSG_TX_QUEUED = 0x0100,
789 NETIF_MSG_INTR = 0x0200,
790 NETIF_MSG_TX_DONE = 0x0400,
791 NETIF_MSG_RX_STATUS = 0x0800,
792 NETIF_MSG_PKTDATA = 0x1000,
793 NETIF_MSG_HW = 0x2000,
794 NETIF_MSG_WOL = 0x4000,
795};
796
797#define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
798#define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
799#define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
800#define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
801#define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
802#define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
803#define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
804#define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
805#define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
806#define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
807#define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
808#define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
809#define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
810#define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
811#define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
812
813static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
814{
815 /* use default */
816 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
817 return default_msg_enable_bits;
818 if (debug_value == 0) /* no output */
819 return 0;
820 /* set low N bits */
821 return (1 << debug_value) - 1;
822}
823
0a122576
SH		 824/* Test if receive needs to be scheduled */
825static inline int __netif_rx_schedule_prep(struct net_device *dev)
793b883e
SH		 826{
827 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
828}
1da177e4 829
0a122576 830/* Test if receive needs to be scheduled but only if up */
1da177e4
LT		 831static inline int netif_rx_schedule_prep(struct net_device *dev)
832{
0a122576 833 return netif_running(dev) && __netif_rx_schedule_prep(dev);
1da177e4
LT		 834}
835
836/* Add interface to tail of rx poll list. This assumes that _prep has
837 * already been called and returned 1.
838 */
839
56079431 840extern void __netif_rx_schedule(struct net_device *dev);
1da177e4
LT		 841
842/* Try to reschedule poll. Called by irq handler. */
843
844static inline void netif_rx_schedule(struct net_device *dev)
845{
846 if (netif_rx_schedule_prep(dev))
847 __netif_rx_schedule(dev);
848}
849
d3240312
SH		 850/* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
851 * Do not inline this?
852 */
1da177e4
LT		 853static inline int netif_rx_reschedule(struct net_device *dev, int undo)
854{
855 if (netif_rx_schedule_prep(dev)) {
856 unsigned long flags;
d3240312
SH		 857
858 dev->quota += undo;
859
1da177e4 860 local_irq_save(flags);
d3240312
SH		 861 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
862 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1da177e4
LT		 863 local_irq_restore(flags);
864 return 1;
865 }
866 return 0;
867}
868
869/* Remove interface from poll list: it must be in the poll list
870 * on current cpu. This primitive is called by dev->poll(), when
871 * it completes the work. The device cannot be out of poll list at this
872 * moment, it is BUG().
873 */
874static inline void netif_rx_complete(struct net_device *dev)
875{
876 unsigned long flags;
877
878 local_irq_save(flags);
879 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
880 list_del(&dev->poll_list);
881 smp_mb__before_clear_bit();
882 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
883 local_irq_restore(flags);
884}
885
886static inline void netif_poll_disable(struct net_device *dev)
887{
3173c890 888 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state))
1da177e4 889 /* No hurry. */
3173c890 890 schedule_timeout_interruptible(1);
1da177e4
LT		 891}
892
893static inline void netif_poll_enable(struct net_device *dev)
894{
895 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
896}
897
898/* same as netif_rx_complete, except that local_irq_save(flags)
899 * has already been issued
900 */
901static inline void __netif_rx_complete(struct net_device *dev)
902{
903 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
904 list_del(&dev->poll_list);
905 smp_mb__before_clear_bit();
906 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
907}
908
932ff279
HX		 909static inline void netif_tx_lock(struct net_device *dev)
910{
911 spin_lock(&dev->_xmit_lock);
912 dev->xmit_lock_owner = smp_processor_id();
913}
914
915static inline void netif_tx_lock_bh(struct net_device *dev)
916{
917 spin_lock_bh(&dev->_xmit_lock);
918 dev->xmit_lock_owner = smp_processor_id();
919}
920
921static inline int netif_tx_trylock(struct net_device *dev)
922{
923 int err = spin_trylock(&dev->_xmit_lock);
924 if (!err)
925 dev->xmit_lock_owner = smp_processor_id();
926 return err;
927}
928
929static inline void netif_tx_unlock(struct net_device *dev)
930{
931 dev->xmit_lock_owner = -1;
932 spin_unlock(&dev->_xmit_lock);
933}
934
935static inline void netif_tx_unlock_bh(struct net_device *dev)
936{
937 dev->xmit_lock_owner = -1;
938 spin_unlock_bh(&dev->_xmit_lock);
939}
940
1da177e4
LT		 941static inline void netif_tx_disable(struct net_device *dev)
942{
932ff279 943 netif_tx_lock_bh(dev);
1da177e4 944 netif_stop_queue(dev);
932ff279 945 netif_tx_unlock_bh(dev);
1da177e4
LT		 946}
947
948/* These functions live elsewhere (drivers/net/net_init.c, but related) */
949
950extern void ether_setup(struct net_device *dev);
951
952/* Support for loadable net-drivers */
953extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
954 void (*setup)(struct net_device *));
955extern int register_netdev(struct net_device *dev);
956extern void unregister_netdev(struct net_device *dev);
957/* Functions used for multicast support */
958extern void dev_mc_upload(struct net_device *dev);
959extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
960extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
961extern void dev_mc_discard(struct net_device *dev);
962extern void dev_set_promiscuity(struct net_device *dev, int inc);
963extern void dev_set_allmulti(struct net_device *dev, int inc);
964extern void netdev_state_change(struct net_device *dev);
d8a33ac4 965extern void netdev_features_change(struct net_device *dev);
1da177e4
LT		 966/* Load a device via the kmod */
967extern void dev_load(const char *name);
968extern void dev_mcast_init(void);
969extern int netdev_max_backlog;
970extern int weight_p;
971extern int netdev_set_master(struct net_device *dev, struct net_device *master);
972extern int skb_checksum_help(struct sk_buff *skb, int inward);
576a30eb 973extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
fb286bb2
HX		 974#ifdef CONFIG_BUG
975extern void netdev_rx_csum_fault(struct net_device *dev);
976#else
977static inline void netdev_rx_csum_fault(struct net_device *dev)
978{
979}
980#endif
1da177e4
LT		 981/* rx skb timestamps */
982extern void net_enable_timestamp(void);
983extern void net_disable_timestamp(void);
984
20380731
ACM		 985#ifdef CONFIG_PROC_FS
986extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
987extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
988extern void dev_seq_stop(struct seq_file *seq, void *v);
989#endif
990
991extern void linkwatch_run_queue(void);
992
576a30eb
HX		 993static inline int skb_gso_ok(struct sk_buff *skb, int features)
994{
995 int feature = skb_shinfo(skb)->gso_size ?
996 skb_shinfo(skb)->gso_type << NETIF_F_GSO_SHIFT : 0;
997 return (features & feature) != feature;
998}
999
7967168c
HX		 1000static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1001{
576a30eb 1002 return skb_gso_ok(skb, dev->features);
7967168c
HX		 1003}
1004
1da177e4
LT		 1005#endif /* __KERNEL__ */
1006
1007#endif /* _LINUX_DEV_H */
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