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[SCTP]: Cleanup of the sctp state table code.
[mirror_ubuntu-zesty-kernel.git] / include / linux / netdevice.h
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the Interfaces handler.
7 *
8 * Version: @(#)dev.h 1.0.10 08/12/93
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Corey Minyard <wf-rch!minyard@relay.EU.net>
13 * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
14 * Alan Cox, <Alan.Cox@linux.org>
15 * Bjorn Ekwall. <bj0rn@blox.se>
16 * Pekka Riikonen <priikone@poseidon.pspt.fi>
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 *
23 * Moved to /usr/include/linux for NET3
24 */
25 #ifndef _LINUX_NETDEVICE_H
26 #define _LINUX_NETDEVICE_H
27
28 #include <linux/if.h>
29 #include <linux/if_ether.h>
30 #include <linux/if_packet.h>
31
32 #ifdef __KERNEL__
33 #include <asm/atomic.h>
34 #include <asm/cache.h>
35 #include <asm/byteorder.h>
36
37 #include <linux/device.h>
38 #include <linux/percpu.h>
39 #include <linux/dmaengine.h>
40
41 struct vlan_group;
42 struct ethtool_ops;
43 struct netpoll_info;
44 /* source back-compat hooks */
45 #define SET_ETHTOOL_OPS(netdev,ops) \
46 ( (netdev)->ethtool_ops = (ops) )
47
48 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
49 functions are available. */
50 #define HAVE_FREE_NETDEV /* free_netdev() */
51 #define HAVE_NETDEV_PRIV /* netdev_priv() */
52
53 #define NET_XMIT_SUCCESS 0
54 #define NET_XMIT_DROP 1 /* skb dropped */
55 #define NET_XMIT_CN 2 /* congestion notification */
56 #define NET_XMIT_POLICED 3 /* skb is shot by police */
57 #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue;
58 (TC use only - dev_queue_xmit
59 returns this as NET_XMIT_SUCCESS) */
60
61 /* Backlog congestion levels */
62 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
63 #define NET_RX_DROP 1 /* packet dropped */
64 #define NET_RX_CN_LOW 2 /* storm alert, just in case */
65 #define NET_RX_CN_MOD 3 /* Storm on its way! */
66 #define NET_RX_CN_HIGH 4 /* The storm is here */
67 #define NET_RX_BAD 5 /* packet dropped due to kernel error */
68
69 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
70
71 #endif
72
73 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
74
75 /* Driver transmit return codes */
76 #define NETDEV_TX_OK 0 /* driver took care of packet */
77 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
78 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
79
80 /*
81 * Compute the worst case header length according to the protocols
82 * used.
83 */
84
85 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
86 #define LL_MAX_HEADER 32
87 #else
88 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
89 #define LL_MAX_HEADER 96
90 #else
91 #define LL_MAX_HEADER 48
92 #endif
93 #endif
94
95 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
96 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
97 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
98 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
99 #define MAX_HEADER LL_MAX_HEADER
100 #else
101 #define MAX_HEADER (LL_MAX_HEADER + 48)
102 #endif
103
104 /*
105 * Network device statistics. Akin to the 2.0 ether stats but
106 * with byte counters.
107 */
108
109 struct net_device_stats
110 {
111 unsigned long rx_packets; /* total packets received */
112 unsigned long tx_packets; /* total packets transmitted */
113 unsigned long rx_bytes; /* total bytes received */
114 unsigned long tx_bytes; /* total bytes transmitted */
115 unsigned long rx_errors; /* bad packets received */
116 unsigned long tx_errors; /* packet transmit problems */
117 unsigned long rx_dropped; /* no space in linux buffers */
118 unsigned long tx_dropped; /* no space available in linux */
119 unsigned long multicast; /* multicast packets received */
120 unsigned long collisions;
121
122 /* detailed rx_errors: */
123 unsigned long rx_length_errors;
124 unsigned long rx_over_errors; /* receiver ring buff overflow */
125 unsigned long rx_crc_errors; /* recved pkt with crc error */
126 unsigned long rx_frame_errors; /* recv'd frame alignment error */
127 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
128 unsigned long rx_missed_errors; /* receiver missed packet */
129
130 /* detailed tx_errors */
131 unsigned long tx_aborted_errors;
132 unsigned long tx_carrier_errors;
133 unsigned long tx_fifo_errors;
134 unsigned long tx_heartbeat_errors;
135 unsigned long tx_window_errors;
136
137 /* for cslip etc */
138 unsigned long rx_compressed;
139 unsigned long tx_compressed;
140 };
141
142
143 /* Media selection options. */
144 enum {
145 IF_PORT_UNKNOWN = 0,
146 IF_PORT_10BASE2,
147 IF_PORT_10BASET,
148 IF_PORT_AUI,
149 IF_PORT_100BASET,
150 IF_PORT_100BASETX,
151 IF_PORT_100BASEFX
152 };
153
154 #ifdef __KERNEL__
155
156 #include <linux/cache.h>
157 #include <linux/skbuff.h>
158
159 struct neighbour;
160 struct neigh_parms;
161 struct sk_buff;
162
163 struct netif_rx_stats
164 {
165 unsigned total;
166 unsigned dropped;
167 unsigned time_squeeze;
168 unsigned cpu_collision;
169 };
170
171 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
172
173
174 /*
175 * We tag multicasts with these structures.
176 */
177
178 struct dev_mc_list
179 {
180 struct dev_mc_list *next;
181 __u8 dmi_addr[MAX_ADDR_LEN];
182 unsigned char dmi_addrlen;
183 int dmi_users;
184 int dmi_gusers;
185 };
186
187 struct hh_cache
188 {
189 struct hh_cache *hh_next; /* Next entry */
190 atomic_t hh_refcnt; /* number of users */
191 __be16 hh_type; /* protocol identifier, f.e ETH_P_IP
192 * NOTE: For VLANs, this will be the
193 * encapuslated type. --BLG
194 */
195 int hh_len; /* length of header */
196 int (*hh_output)(struct sk_buff *skb);
197 rwlock_t hh_lock;
198
199 /* cached hardware header; allow for machine alignment needs. */
200 #define HH_DATA_MOD 16
201 #define HH_DATA_OFF(__len) \
202 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
203 #define HH_DATA_ALIGN(__len) \
204 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
205 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
206 };
207
208 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
209 * Alternative is:
210 * dev->hard_header_len ? (dev->hard_header_len +
211 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
212 *
213 * We could use other alignment values, but we must maintain the
214 * relationship HH alignment <= LL alignment.
215 */
216 #define LL_RESERVED_SPACE(dev) \
217 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
218 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
219 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
220
221 /* These flag bits are private to the generic network queueing
222 * layer, they may not be explicitly referenced by any other
223 * code.
224 */
225
226 enum netdev_state_t
227 {
228 __LINK_STATE_XOFF=0,
229 __LINK_STATE_START,
230 __LINK_STATE_PRESENT,
231 __LINK_STATE_SCHED,
232 __LINK_STATE_NOCARRIER,
233 __LINK_STATE_RX_SCHED,
234 __LINK_STATE_LINKWATCH_PENDING,
235 __LINK_STATE_DORMANT,
236 __LINK_STATE_QDISC_RUNNING,
237 };
238
239
240 /*
241 * This structure holds at boot time configured netdevice settings. They
242 * are then used in the device probing.
243 */
244 struct netdev_boot_setup {
245 char name[IFNAMSIZ];
246 struct ifmap map;
247 };
248 #define NETDEV_BOOT_SETUP_MAX 8
249
250 extern int __init netdev_boot_setup(char *str);
251
252 /*
253 * The DEVICE structure.
254 * Actually, this whole structure is a big mistake. It mixes I/O
255 * data with strictly "high-level" data, and it has to know about
256 * almost every data structure used in the INET module.
257 *
258 * FIXME: cleanup struct net_device such that network protocol info
259 * moves out.
260 */
261
262 struct net_device
263 {
264
265 /*
266 * This is the first field of the "visible" part of this structure
267 * (i.e. as seen by users in the "Space.c" file). It is the name
268 * the interface.
269 */
270 char name[IFNAMSIZ];
271 /* device name hash chain */
272 struct hlist_node name_hlist;
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 /* Net device features */
301 unsigned long features;
302 #define NETIF_F_SG 1 /* Scatter/gather IO. */
303 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
304 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
305 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
306 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
307 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
308 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
309 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
310 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
311 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
312 #define NETIF_F_GSO 2048 /* Enable software GSO. */
313 #define NETIF_F_LLTX 4096 /* LockLess TX */
314
315 /* Segmentation offload features */
316 #define NETIF_F_GSO_SHIFT 16
317 #define NETIF_F_GSO_MASK 0xffff0000
318 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
319 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
320 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
321 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
322 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
323
324 /* List of features with software fallbacks. */
325 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
326
327 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
328 #define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
329
330 struct net_device *next_sched;
331
332 /* Interface index. Unique device identifier */
333 int ifindex;
334 int iflink;
335
336
337 struct net_device_stats* (*get_stats)(struct net_device *dev);
338
339 /* List of functions to handle Wireless Extensions (instead of ioctl).
340 * See <net/iw_handler.h> for details. Jean II */
341 const struct iw_handler_def * wireless_handlers;
342 /* Instance data managed by the core of Wireless Extensions. */
343 struct iw_public_data * wireless_data;
344
345 const struct ethtool_ops *ethtool_ops;
346
347 /*
348 * This marks the end of the "visible" part of the structure. All
349 * fields hereafter are internal to the system, and may change at
350 * will (read: may be cleaned up at will).
351 */
352
353
354 unsigned int flags; /* interface flags (a la BSD) */
355 unsigned short gflags;
356 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
357 unsigned short padded; /* How much padding added by alloc_netdev() */
358
359 unsigned char operstate; /* RFC2863 operstate */
360 unsigned char link_mode; /* mapping policy to operstate */
361
362 unsigned mtu; /* interface MTU value */
363 unsigned short type; /* interface hardware type */
364 unsigned short hard_header_len; /* hardware hdr length */
365
366 struct net_device *master; /* Pointer to master device of a group,
367 * which this device is member of.
368 */
369
370 /* Interface address info. */
371 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
372 unsigned char addr_len; /* hardware address length */
373 unsigned short dev_id; /* for shared network cards */
374
375 struct dev_mc_list *mc_list; /* Multicast mac addresses */
376 int mc_count; /* Number of installed mcasts */
377 int promiscuity;
378 int allmulti;
379
380
381 /* Protocol specific pointers */
382
383 void *atalk_ptr; /* AppleTalk link */
384 void *ip_ptr; /* IPv4 specific data */
385 void *dn_ptr; /* DECnet specific data */
386 void *ip6_ptr; /* IPv6 specific data */
387 void *ec_ptr; /* Econet specific data */
388 void *ax25_ptr; /* AX.25 specific data */
389
390 /*
391 * Cache line mostly used on receive path (including eth_type_trans())
392 */
393 struct list_head poll_list ____cacheline_aligned_in_smp;
394 /* Link to poll list */
395
396 int (*poll) (struct net_device *dev, int *quota);
397 int quota;
398 int weight;
399 unsigned long last_rx; /* Time of last Rx */
400 /* Interface address info used in eth_type_trans() */
401 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
402 because most packets are unicast) */
403
404 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
405
406 /*
407 * Cache line mostly used on queue transmit path (qdisc)
408 */
409 /* device queue lock */
410 spinlock_t queue_lock ____cacheline_aligned_in_smp;
411 struct Qdisc *qdisc;
412 struct Qdisc *qdisc_sleeping;
413 struct list_head qdisc_list;
414 unsigned long tx_queue_len; /* Max frames per queue allowed */
415
416 /* Partially transmitted GSO packet. */
417 struct sk_buff *gso_skb;
418
419 /* ingress path synchronizer */
420 spinlock_t ingress_lock;
421 struct Qdisc *qdisc_ingress;
422
423 /*
424 * One part is mostly used on xmit path (device)
425 */
426 /* hard_start_xmit synchronizer */
427 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
428 /* cpu id of processor entered to hard_start_xmit or -1,
429 if nobody entered there.
430 */
431 int xmit_lock_owner;
432 void *priv; /* pointer to private data */
433 int (*hard_start_xmit) (struct sk_buff *skb,
434 struct net_device *dev);
435 /* These may be needed for future network-power-down code. */
436 unsigned long trans_start; /* Time (in jiffies) of last Tx */
437
438 int watchdog_timeo; /* used by dev_watchdog() */
439 struct timer_list watchdog_timer;
440
441 /*
442 * refcnt is a very hot point, so align it on SMP
443 */
444 /* Number of references to this device */
445 atomic_t refcnt ____cacheline_aligned_in_smp;
446
447 /* delayed register/unregister */
448 struct list_head todo_list;
449 /* device index hash chain */
450 struct hlist_node index_hlist;
451
452 /* register/unregister state machine */
453 enum { NETREG_UNINITIALIZED=0,
454 NETREG_REGISTERED, /* completed register_netdevice */
455 NETREG_UNREGISTERING, /* called unregister_netdevice */
456 NETREG_UNREGISTERED, /* completed unregister todo */
457 NETREG_RELEASED, /* called free_netdev */
458 } reg_state;
459
460 /* Called after device is detached from network. */
461 void (*uninit)(struct net_device *dev);
462 /* Called after last user reference disappears. */
463 void (*destructor)(struct net_device *dev);
464
465 /* Pointers to interface service routines. */
466 int (*open)(struct net_device *dev);
467 int (*stop)(struct net_device *dev);
468 #define HAVE_NETDEV_POLL
469 int (*hard_header) (struct sk_buff *skb,
470 struct net_device *dev,
471 unsigned short type,
472 void *daddr,
473 void *saddr,
474 unsigned len);
475 int (*rebuild_header)(struct sk_buff *skb);
476 #define HAVE_MULTICAST
477 void (*set_multicast_list)(struct net_device *dev);
478 #define HAVE_SET_MAC_ADDR
479 int (*set_mac_address)(struct net_device *dev,
480 void *addr);
481 #define HAVE_PRIVATE_IOCTL
482 int (*do_ioctl)(struct net_device *dev,
483 struct ifreq *ifr, int cmd);
484 #define HAVE_SET_CONFIG
485 int (*set_config)(struct net_device *dev,
486 struct ifmap *map);
487 #define HAVE_HEADER_CACHE
488 int (*hard_header_cache)(struct neighbour *neigh,
489 struct hh_cache *hh);
490 void (*header_cache_update)(struct hh_cache *hh,
491 struct net_device *dev,
492 unsigned char * haddr);
493 #define HAVE_CHANGE_MTU
494 int (*change_mtu)(struct net_device *dev, int new_mtu);
495
496 #define HAVE_TX_TIMEOUT
497 void (*tx_timeout) (struct net_device *dev);
498
499 void (*vlan_rx_register)(struct net_device *dev,
500 struct vlan_group *grp);
501 void (*vlan_rx_add_vid)(struct net_device *dev,
502 unsigned short vid);
503 void (*vlan_rx_kill_vid)(struct net_device *dev,
504 unsigned short vid);
505
506 int (*hard_header_parse)(struct sk_buff *skb,
507 unsigned char *haddr);
508 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
509 #ifdef CONFIG_NETPOLL
510 struct netpoll_info *npinfo;
511 #endif
512 #ifdef CONFIG_NET_POLL_CONTROLLER
513 void (*poll_controller)(struct net_device *dev);
514 #endif
515
516 /* bridge stuff */
517 struct net_bridge_port *br_port;
518
519 /* class/net/name entry */
520 struct class_device class_dev;
521 /* space for optional statistics and wireless sysfs groups */
522 struct attribute_group *sysfs_groups[3];
523 };
524
525 #define NETDEV_ALIGN 32
526 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
527
528 static inline void *netdev_priv(struct net_device *dev)
529 {
530 return (char *)dev + ((sizeof(struct net_device)
531 + NETDEV_ALIGN_CONST)
532 & ~NETDEV_ALIGN_CONST);
533 }
534
535 #define SET_MODULE_OWNER(dev) do { } while (0)
536 /* Set the sysfs physical device reference for the network logical device
537 * if set prior to registration will cause a symlink during initialization.
538 */
539 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev))
540
541 struct packet_type {
542 __be16 type; /* This is really htons(ether_type). */
543 struct net_device *dev; /* NULL is wildcarded here */
544 int (*func) (struct sk_buff *,
545 struct net_device *,
546 struct packet_type *,
547 struct net_device *);
548 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
549 int features);
550 int (*gso_send_check)(struct sk_buff *skb);
551 void *af_packet_priv;
552 struct list_head list;
553 };
554
555 #include <linux/interrupt.h>
556 #include <linux/notifier.h>
557
558 extern struct net_device loopback_dev; /* The loopback */
559 extern struct net_device *dev_base; /* All devices */
560 extern rwlock_t dev_base_lock; /* Device list lock */
561
562 extern int netdev_boot_setup_check(struct net_device *dev);
563 extern unsigned long netdev_boot_base(const char *prefix, int unit);
564 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr);
565 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
566 extern void dev_add_pack(struct packet_type *pt);
567 extern void dev_remove_pack(struct packet_type *pt);
568 extern void __dev_remove_pack(struct packet_type *pt);
569
570 extern struct net_device *dev_get_by_flags(unsigned short flags,
571 unsigned short mask);
572 extern struct net_device *dev_get_by_name(const char *name);
573 extern struct net_device *__dev_get_by_name(const char *name);
574 extern int dev_alloc_name(struct net_device *dev, const char *name);
575 extern int dev_open(struct net_device *dev);
576 extern int dev_close(struct net_device *dev);
577 extern int dev_queue_xmit(struct sk_buff *skb);
578 extern int register_netdevice(struct net_device *dev);
579 extern int unregister_netdevice(struct net_device *dev);
580 extern void free_netdev(struct net_device *dev);
581 extern void synchronize_net(void);
582 extern int register_netdevice_notifier(struct notifier_block *nb);
583 extern int unregister_netdevice_notifier(struct notifier_block *nb);
584 extern int call_netdevice_notifiers(unsigned long val, void *v);
585 extern struct net_device *dev_get_by_index(int ifindex);
586 extern struct net_device *__dev_get_by_index(int ifindex);
587 extern int dev_restart(struct net_device *dev);
588 #ifdef CONFIG_NETPOLL_TRAP
589 extern int netpoll_trap(void);
590 #endif
591
592 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
593 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
594 static inline int unregister_gifconf(unsigned int family)
595 {
596 return register_gifconf(family, NULL);
597 }
598
599 /*
600 * Incoming packets are placed on per-cpu queues so that
601 * no locking is needed.
602 */
603
604 struct softnet_data
605 {
606 struct net_device *output_queue;
607 struct sk_buff_head input_pkt_queue;
608 struct list_head poll_list;
609 struct sk_buff *completion_queue;
610
611 struct net_device backlog_dev; /* Sorry. 8) */
612 #ifdef CONFIG_NET_DMA
613 struct dma_chan *net_dma;
614 #endif
615 };
616
617 DECLARE_PER_CPU(struct softnet_data,softnet_data);
618
619 #define HAVE_NETIF_QUEUE
620
621 extern void __netif_schedule(struct net_device *dev);
622
623 static inline void netif_schedule(struct net_device *dev)
624 {
625 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
626 __netif_schedule(dev);
627 }
628
629 static inline void netif_start_queue(struct net_device *dev)
630 {
631 clear_bit(__LINK_STATE_XOFF, &dev->state);
632 }
633
634 static inline void netif_wake_queue(struct net_device *dev)
635 {
636 #ifdef CONFIG_NETPOLL_TRAP
637 if (netpoll_trap())
638 return;
639 #endif
640 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
641 __netif_schedule(dev);
642 }
643
644 static inline void netif_stop_queue(struct net_device *dev)
645 {
646 #ifdef CONFIG_NETPOLL_TRAP
647 if (netpoll_trap())
648 return;
649 #endif
650 set_bit(__LINK_STATE_XOFF, &dev->state);
651 }
652
653 static inline int netif_queue_stopped(const struct net_device *dev)
654 {
655 return test_bit(__LINK_STATE_XOFF, &dev->state);
656 }
657
658 static inline int netif_running(const struct net_device *dev)
659 {
660 return test_bit(__LINK_STATE_START, &dev->state);
661 }
662
663
664 /* Use this variant when it is known for sure that it
665 * is executing from interrupt context.
666 */
667 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
668 {
669 if (atomic_dec_and_test(&skb->users)) {
670 struct softnet_data *sd;
671 unsigned long flags;
672
673 local_irq_save(flags);
674 sd = &__get_cpu_var(softnet_data);
675 skb->next = sd->completion_queue;
676 sd->completion_queue = skb;
677 raise_softirq_irqoff(NET_TX_SOFTIRQ);
678 local_irq_restore(flags);
679 }
680 }
681
682 /* Use this variant in places where it could be invoked
683 * either from interrupt or non-interrupt context.
684 */
685 extern void dev_kfree_skb_any(struct sk_buff *skb);
686
687 #define HAVE_NETIF_RX 1
688 extern int netif_rx(struct sk_buff *skb);
689 extern int netif_rx_ni(struct sk_buff *skb);
690 #define HAVE_NETIF_RECEIVE_SKB 1
691 extern int netif_receive_skb(struct sk_buff *skb);
692 extern int dev_valid_name(const char *name);
693 extern int dev_ioctl(unsigned int cmd, void __user *);
694 extern int dev_ethtool(struct ifreq *);
695 extern unsigned dev_get_flags(const struct net_device *);
696 extern int dev_change_flags(struct net_device *, unsigned);
697 extern int dev_change_name(struct net_device *, char *);
698 extern int dev_set_mtu(struct net_device *, int);
699 extern int dev_set_mac_address(struct net_device *,
700 struct sockaddr *);
701 extern int dev_hard_start_xmit(struct sk_buff *skb,
702 struct net_device *dev);
703
704 extern void dev_init(void);
705
706 extern int netdev_budget;
707
708 /* Called by rtnetlink.c:rtnl_unlock() */
709 extern void netdev_run_todo(void);
710
711 static inline void dev_put(struct net_device *dev)
712 {
713 atomic_dec(&dev->refcnt);
714 }
715
716 static inline void dev_hold(struct net_device *dev)
717 {
718 atomic_inc(&dev->refcnt);
719 }
720
721 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
722 * and _off may be called from IRQ context, but it is caller
723 * who is responsible for serialization of these calls.
724 *
725 * The name carrier is inappropriate, these functions should really be
726 * called netif_lowerlayer_*() because they represent the state of any
727 * kind of lower layer not just hardware media.
728 */
729
730 extern void linkwatch_fire_event(struct net_device *dev);
731
732 static inline int netif_carrier_ok(const struct net_device *dev)
733 {
734 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
735 }
736
737 extern void __netdev_watchdog_up(struct net_device *dev);
738
739 extern void netif_carrier_on(struct net_device *dev);
740
741 extern void netif_carrier_off(struct net_device *dev);
742
743 static inline void netif_dormant_on(struct net_device *dev)
744 {
745 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
746 linkwatch_fire_event(dev);
747 }
748
749 static inline void netif_dormant_off(struct net_device *dev)
750 {
751 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
752 linkwatch_fire_event(dev);
753 }
754
755 static inline int netif_dormant(const struct net_device *dev)
756 {
757 return test_bit(__LINK_STATE_DORMANT, &dev->state);
758 }
759
760
761 static inline int netif_oper_up(const struct net_device *dev) {
762 return (dev->operstate == IF_OPER_UP ||
763 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
764 }
765
766 /* Hot-plugging. */
767 static inline int netif_device_present(struct net_device *dev)
768 {
769 return test_bit(__LINK_STATE_PRESENT, &dev->state);
770 }
771
772 extern void netif_device_detach(struct net_device *dev);
773
774 extern void netif_device_attach(struct net_device *dev);
775
776 /*
777 * Network interface message level settings
778 */
779 #define HAVE_NETIF_MSG 1
780
781 enum {
782 NETIF_MSG_DRV = 0x0001,
783 NETIF_MSG_PROBE = 0x0002,
784 NETIF_MSG_LINK = 0x0004,
785 NETIF_MSG_TIMER = 0x0008,
786 NETIF_MSG_IFDOWN = 0x0010,
787 NETIF_MSG_IFUP = 0x0020,
788 NETIF_MSG_RX_ERR = 0x0040,
789 NETIF_MSG_TX_ERR = 0x0080,
790 NETIF_MSG_TX_QUEUED = 0x0100,
791 NETIF_MSG_INTR = 0x0200,
792 NETIF_MSG_TX_DONE = 0x0400,
793 NETIF_MSG_RX_STATUS = 0x0800,
794 NETIF_MSG_PKTDATA = 0x1000,
795 NETIF_MSG_HW = 0x2000,
796 NETIF_MSG_WOL = 0x4000,
797 };
798
799 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
800 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
801 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
802 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
803 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
804 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
805 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
806 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
807 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
808 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
809 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
810 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
811 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
812 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
813 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
814
815 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
816 {
817 /* use default */
818 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
819 return default_msg_enable_bits;
820 if (debug_value == 0) /* no output */
821 return 0;
822 /* set low N bits */
823 return (1 << debug_value) - 1;
824 }
825
826 /* Test if receive needs to be scheduled */
827 static inline int __netif_rx_schedule_prep(struct net_device *dev)
828 {
829 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
830 }
831
832 /* Test if receive needs to be scheduled but only if up */
833 static inline int netif_rx_schedule_prep(struct net_device *dev)
834 {
835 return netif_running(dev) && __netif_rx_schedule_prep(dev);
836 }
837
838 /* Add interface to tail of rx poll list. This assumes that _prep has
839 * already been called and returned 1.
840 */
841
842 extern void __netif_rx_schedule(struct net_device *dev);
843
844 /* Try to reschedule poll. Called by irq handler. */
845
846 static inline void netif_rx_schedule(struct net_device *dev)
847 {
848 if (netif_rx_schedule_prep(dev))
849 __netif_rx_schedule(dev);
850 }
851
852 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
853 * Do not inline this?
854 */
855 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
856 {
857 if (netif_rx_schedule_prep(dev)) {
858 unsigned long flags;
859
860 dev->quota += undo;
861
862 local_irq_save(flags);
863 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
864 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
865 local_irq_restore(flags);
866 return 1;
867 }
868 return 0;
869 }
870
871 /* Remove interface from poll list: it must be in the poll list
872 * on current cpu. This primitive is called by dev->poll(), when
873 * it completes the work. The device cannot be out of poll list at this
874 * moment, it is BUG().
875 */
876 static inline void netif_rx_complete(struct net_device *dev)
877 {
878 unsigned long flags;
879
880 local_irq_save(flags);
881 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
882 list_del(&dev->poll_list);
883 smp_mb__before_clear_bit();
884 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
885 local_irq_restore(flags);
886 }
887
888 static inline void netif_poll_disable(struct net_device *dev)
889 {
890 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state))
891 /* No hurry. */
892 schedule_timeout_interruptible(1);
893 }
894
895 static inline void netif_poll_enable(struct net_device *dev)
896 {
897 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
898 }
899
900 /* same as netif_rx_complete, except that local_irq_save(flags)
901 * has already been issued
902 */
903 static inline void __netif_rx_complete(struct net_device *dev)
904 {
905 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
906 list_del(&dev->poll_list);
907 smp_mb__before_clear_bit();
908 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
909 }
910
911 static inline void netif_tx_lock(struct net_device *dev)
912 {
913 spin_lock(&dev->_xmit_lock);
914 dev->xmit_lock_owner = smp_processor_id();
915 }
916
917 static inline void netif_tx_lock_bh(struct net_device *dev)
918 {
919 spin_lock_bh(&dev->_xmit_lock);
920 dev->xmit_lock_owner = smp_processor_id();
921 }
922
923 static inline int netif_tx_trylock(struct net_device *dev)
924 {
925 int ok = spin_trylock(&dev->_xmit_lock);
926 if (likely(ok))
927 dev->xmit_lock_owner = smp_processor_id();
928 return ok;
929 }
930
931 static inline void netif_tx_unlock(struct net_device *dev)
932 {
933 dev->xmit_lock_owner = -1;
934 spin_unlock(&dev->_xmit_lock);
935 }
936
937 static inline void netif_tx_unlock_bh(struct net_device *dev)
938 {
939 dev->xmit_lock_owner = -1;
940 spin_unlock_bh(&dev->_xmit_lock);
941 }
942
943 static inline void netif_tx_disable(struct net_device *dev)
944 {
945 netif_tx_lock_bh(dev);
946 netif_stop_queue(dev);
947 netif_tx_unlock_bh(dev);
948 }
949
950 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
951
952 extern void ether_setup(struct net_device *dev);
953
954 /* Support for loadable net-drivers */
955 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
956 void (*setup)(struct net_device *));
957 extern int register_netdev(struct net_device *dev);
958 extern void unregister_netdev(struct net_device *dev);
959 /* Functions used for multicast support */
960 extern void dev_mc_upload(struct net_device *dev);
961 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
962 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
963 extern void dev_mc_discard(struct net_device *dev);
964 extern void dev_set_promiscuity(struct net_device *dev, int inc);
965 extern void dev_set_allmulti(struct net_device *dev, int inc);
966 extern void netdev_state_change(struct net_device *dev);
967 extern void netdev_features_change(struct net_device *dev);
968 /* Load a device via the kmod */
969 extern void dev_load(const char *name);
970 extern void dev_mcast_init(void);
971 extern int netdev_max_backlog;
972 extern int weight_p;
973 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
974 extern int skb_checksum_help(struct sk_buff *skb);
975 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
976 #ifdef CONFIG_BUG
977 extern void netdev_rx_csum_fault(struct net_device *dev);
978 #else
979 static inline void netdev_rx_csum_fault(struct net_device *dev)
980 {
981 }
982 #endif
983 /* rx skb timestamps */
984 extern void net_enable_timestamp(void);
985 extern void net_disable_timestamp(void);
986
987 #ifdef CONFIG_PROC_FS
988 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
989 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
990 extern void dev_seq_stop(struct seq_file *seq, void *v);
991 #endif
992
993 extern void linkwatch_run_queue(void);
994
995 static inline int net_gso_ok(int features, int gso_type)
996 {
997 int feature = gso_type << NETIF_F_GSO_SHIFT;
998 return (features & feature) == feature;
999 }
1000
1001 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1002 {
1003 return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1004 }
1005
1006 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1007 {
1008 return skb_is_gso(skb) &&
1009 (!skb_gso_ok(skb, dev->features) ||
1010 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1011 }
1012
1013 /* On bonding slaves other than the currently active slave, suppress
1014 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1015 * ARP on active-backup slaves with arp_validate enabled.
1016 */
1017 static inline int skb_bond_should_drop(struct sk_buff *skb)
1018 {
1019 struct net_device *dev = skb->dev;
1020 struct net_device *master = dev->master;
1021
1022 if (master &&
1023 (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
1024 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1025 skb->protocol == __constant_htons(ETH_P_ARP))
1026 return 0;
1027
1028 if (master->priv_flags & IFF_MASTER_ALB) {
1029 if (skb->pkt_type != PACKET_BROADCAST &&
1030 skb->pkt_type != PACKET_MULTICAST)
1031 return 0;
1032 }
1033 if (master->priv_flags & IFF_MASTER_8023AD &&
1034 skb->protocol == __constant_htons(ETH_P_SLOW))
1035 return 0;
1036
1037 return 1;
1038 }
1039 return 0;
1040 }
1041
1042 #endif /* __KERNEL__ */
1043
1044 #endif /* _LINUX_DEV_H */
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