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[NET]: Generalise TSO-specific bits from skb_setup_caps
[mirror_ubuntu-artful-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 divert_blk;
42 struct vlan_group;
43 struct ethtool_ops;
44 struct netpoll_info;
45 /* source back-compat hooks */
46 #define SET_ETHTOOL_OPS(netdev,ops) \
47 ( (netdev)->ethtool_ops = (ops) )
48
49 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
50 functions are available. */
51 #define HAVE_FREE_NETDEV /* free_netdev() */
52 #define HAVE_NETDEV_PRIV /* netdev_priv() */
53
54 #define NET_XMIT_SUCCESS 0
55 #define NET_XMIT_DROP 1 /* skb dropped */
56 #define NET_XMIT_CN 2 /* congestion notification */
57 #define NET_XMIT_POLICED 3 /* skb is shot by police */
58 #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue;
59 (TC use only - dev_queue_xmit
60 returns this as NET_XMIT_SUCCESS) */
61
62 /* Backlog congestion levels */
63 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
64 #define NET_RX_DROP 1 /* packet dropped */
65 #define NET_RX_CN_LOW 2 /* storm alert, just in case */
66 #define NET_RX_CN_MOD 3 /* Storm on its way! */
67 #define NET_RX_CN_HIGH 4 /* The storm is here */
68 #define NET_RX_BAD 5 /* packet dropped due to kernel error */
69
70 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
71
72 #endif
73
74 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
75
76 /* Driver transmit return codes */
77 #define NETDEV_TX_OK 0 /* driver took care of packet */
78 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
79 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
80
81 /*
82 * Compute the worst case header length according to the protocols
83 * used.
84 */
85
86 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
87 #define LL_MAX_HEADER 32
88 #else
89 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
90 #define LL_MAX_HEADER 96
91 #else
92 #define LL_MAX_HEADER 48
93 #endif
94 #endif
95
96 #if !defined(CONFIG_NET_IPIP) && \
97 !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE)
98 #define MAX_HEADER LL_MAX_HEADER
99 #else
100 #define MAX_HEADER (LL_MAX_HEADER + 48)
101 #endif
102
103 /*
104 * Network device statistics. Akin to the 2.0 ether stats but
105 * with byte counters.
106 */
107
108 struct net_device_stats
109 {
110 unsigned long rx_packets; /* total packets received */
111 unsigned long tx_packets; /* total packets transmitted */
112 unsigned long rx_bytes; /* total bytes received */
113 unsigned long tx_bytes; /* total bytes transmitted */
114 unsigned long rx_errors; /* bad packets received */
115 unsigned long tx_errors; /* packet transmit problems */
116 unsigned long rx_dropped; /* no space in linux buffers */
117 unsigned long tx_dropped; /* no space available in linux */
118 unsigned long multicast; /* multicast packets received */
119 unsigned long collisions;
120
121 /* detailed rx_errors: */
122 unsigned long rx_length_errors;
123 unsigned long rx_over_errors; /* receiver ring buff overflow */
124 unsigned long rx_crc_errors; /* recved pkt with crc error */
125 unsigned long rx_frame_errors; /* recv'd frame alignment error */
126 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
127 unsigned long rx_missed_errors; /* receiver missed packet */
128
129 /* detailed tx_errors */
130 unsigned long tx_aborted_errors;
131 unsigned long tx_carrier_errors;
132 unsigned long tx_fifo_errors;
133 unsigned long tx_heartbeat_errors;
134 unsigned long tx_window_errors;
135
136 /* for cslip etc */
137 unsigned long rx_compressed;
138 unsigned long tx_compressed;
139 };
140
141
142 /* Media selection options. */
143 enum {
144 IF_PORT_UNKNOWN = 0,
145 IF_PORT_10BASE2,
146 IF_PORT_10BASET,
147 IF_PORT_AUI,
148 IF_PORT_100BASET,
149 IF_PORT_100BASETX,
150 IF_PORT_100BASEFX
151 };
152
153 #ifdef __KERNEL__
154
155 #include <linux/cache.h>
156 #include <linux/skbuff.h>
157
158 struct neighbour;
159 struct neigh_parms;
160 struct sk_buff;
161
162 struct netif_rx_stats
163 {
164 unsigned total;
165 unsigned dropped;
166 unsigned time_squeeze;
167 unsigned cpu_collision;
168 };
169
170 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
171
172
173 /*
174 * We tag multicasts with these structures.
175 */
176
177 struct dev_mc_list
178 {
179 struct dev_mc_list *next;
180 __u8 dmi_addr[MAX_ADDR_LEN];
181 unsigned char dmi_addrlen;
182 int dmi_users;
183 int dmi_gusers;
184 };
185
186 struct hh_cache
187 {
188 struct hh_cache *hh_next; /* Next entry */
189 atomic_t hh_refcnt; /* number of users */
190 unsigned short hh_type; /* protocol identifier, f.e ETH_P_IP
191 * NOTE: For VLANs, this will be the
192 * encapuslated type. --BLG
193 */
194 int hh_len; /* length of header */
195 int (*hh_output)(struct sk_buff *skb);
196 rwlock_t hh_lock;
197
198 /* cached hardware header; allow for machine alignment needs. */
199 #define HH_DATA_MOD 16
200 #define HH_DATA_OFF(__len) \
201 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
202 #define HH_DATA_ALIGN(__len) \
203 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
204 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
205 };
206
207 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
208 * Alternative is:
209 * dev->hard_header_len ? (dev->hard_header_len +
210 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
211 *
212 * We could use other alignment values, but we must maintain the
213 * relationship HH alignment <= LL alignment.
214 */
215 #define LL_RESERVED_SPACE(dev) \
216 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
217 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
218 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
219
220 /* These flag bits are private to the generic network queueing
221 * layer, they may not be explicitly referenced by any other
222 * code.
223 */
224
225 enum netdev_state_t
226 {
227 __LINK_STATE_XOFF=0,
228 __LINK_STATE_START,
229 __LINK_STATE_PRESENT,
230 __LINK_STATE_SCHED,
231 __LINK_STATE_NOCARRIER,
232 __LINK_STATE_RX_SCHED,
233 __LINK_STATE_LINKWATCH_PENDING,
234 __LINK_STATE_DORMANT,
235 __LINK_STATE_QDISC_RUNNING,
236 };
237
238
239 /*
240 * This structure holds at boot time configured netdevice settings. They
241 * are then used in the device probing.
242 */
243 struct netdev_boot_setup {
244 char name[IFNAMSIZ];
245 struct ifmap map;
246 };
247 #define NETDEV_BOOT_SETUP_MAX 8
248
249 extern int __init netdev_boot_setup(char *str);
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
261 struct 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];
270 /* device name hash chain */
271 struct hlist_node name_hlist;
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
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 */
311 #define NETIF_F_GSO 2048 /* Enable software GSO. */
312 #define NETIF_F_LLTX 4096 /* LockLess TX */
313
314 /* Segmentation offload features */
315 #define NETIF_F_GSO_SHIFT 16
316 #define NETIF_F_GSO_MASK 0xffff0000
317 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
318 #define NETIF_F_UFO (SKB_GSO_UDPV4 << NETIF_F_GSO_SHIFT)
319 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
320 #define NETIF_F_TSO_ECN (SKB_GSO_TCPV4_ECN << NETIF_F_GSO_SHIFT)
321
322 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
323 #define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
324
325 struct net_device *next_sched;
326
327 /* Interface index. Unique device identifier */
328 int ifindex;
329 int iflink;
330
331
332 struct net_device_stats* (*get_stats)(struct net_device *dev);
333 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev);
334
335 /* List of functions to handle Wireless Extensions (instead of ioctl).
336 * See <net/iw_handler.h> for details. Jean II */
337 const struct iw_handler_def * wireless_handlers;
338 /* Instance data managed by the core of Wireless Extensions. */
339 struct iw_public_data * wireless_data;
340
341 struct ethtool_ops *ethtool_ops;
342
343 /*
344 * This marks the end of the "visible" part of the structure. All
345 * fields hereafter are internal to the system, and may change at
346 * will (read: may be cleaned up at will).
347 */
348
349
350 unsigned int flags; /* interface flags (a la BSD) */
351 unsigned short gflags;
352 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
353 unsigned short padded; /* How much padding added by alloc_netdev() */
354
355 unsigned char operstate; /* RFC2863 operstate */
356 unsigned char link_mode; /* mapping policy to operstate */
357
358 unsigned mtu; /* interface MTU value */
359 unsigned short type; /* interface hardware type */
360 unsigned short hard_header_len; /* hardware hdr length */
361
362 struct net_device *master; /* Pointer to master device of a group,
363 * which this device is member of.
364 */
365
366 /* Interface address info. */
367 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
368 unsigned char addr_len; /* hardware address length */
369 unsigned short dev_id; /* for shared network cards */
370
371 struct dev_mc_list *mc_list; /* Multicast mac addresses */
372 int mc_count; /* Number of installed mcasts */
373 int promiscuity;
374 int allmulti;
375
376
377 /* Protocol specific pointers */
378
379 void *atalk_ptr; /* AppleTalk link */
380 void *ip_ptr; /* IPv4 specific data */
381 void *dn_ptr; /* DECnet specific data */
382 void *ip6_ptr; /* IPv6 specific data */
383 void *ec_ptr; /* Econet specific data */
384 void *ax25_ptr; /* AX.25 specific data */
385
386 /*
387 * Cache line mostly used on receive path (including eth_type_trans())
388 */
389 struct list_head poll_list ____cacheline_aligned_in_smp;
390 /* Link to poll list */
391
392 int (*poll) (struct net_device *dev, int *quota);
393 int quota;
394 int weight;
395 unsigned long last_rx; /* Time of last Rx */
396 /* Interface address info used in eth_type_trans() */
397 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
398 because most packets are unicast) */
399
400 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
401
402 /*
403 * Cache line mostly used on queue transmit path (qdisc)
404 */
405 /* device queue lock */
406 spinlock_t queue_lock ____cacheline_aligned_in_smp;
407 struct Qdisc *qdisc;
408 struct Qdisc *qdisc_sleeping;
409 struct list_head qdisc_list;
410 unsigned long tx_queue_len; /* Max frames per queue allowed */
411
412 /* Partially transmitted GSO packet. */
413 struct sk_buff *gso_skb;
414
415 /* ingress path synchronizer */
416 spinlock_t ingress_lock;
417 struct Qdisc *qdisc_ingress;
418
419 /*
420 * One part is mostly used on xmit path (device)
421 */
422 /* hard_start_xmit synchronizer */
423 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
424 /* cpu id of processor entered to hard_start_xmit or -1,
425 if nobody entered there.
426 */
427 int xmit_lock_owner;
428 void *priv; /* pointer to private data */
429 int (*hard_start_xmit) (struct sk_buff *skb,
430 struct net_device *dev);
431 /* These may be needed for future network-power-down code. */
432 unsigned long trans_start; /* Time (in jiffies) of last Tx */
433
434 int watchdog_timeo; /* used by dev_watchdog() */
435 struct timer_list watchdog_timer;
436
437 /*
438 * refcnt is a very hot point, so align it on SMP
439 */
440 /* Number of references to this device */
441 atomic_t refcnt ____cacheline_aligned_in_smp;
442
443 /* delayed register/unregister */
444 struct list_head todo_list;
445 /* device index hash chain */
446 struct hlist_node index_hlist;
447
448 /* register/unregister state machine */
449 enum { NETREG_UNINITIALIZED=0,
450 NETREG_REGISTERED, /* completed register_netdevice */
451 NETREG_UNREGISTERING, /* called unregister_netdevice */
452 NETREG_UNREGISTERED, /* completed unregister todo */
453 NETREG_RELEASED, /* called free_netdev */
454 } reg_state;
455
456 /* Called after device is detached from network. */
457 void (*uninit)(struct net_device *dev);
458 /* Called after last user reference disappears. */
459 void (*destructor)(struct net_device *dev);
460
461 /* Pointers to interface service routines. */
462 int (*open)(struct net_device *dev);
463 int (*stop)(struct net_device *dev);
464 #define HAVE_NETDEV_POLL
465 int (*hard_header) (struct sk_buff *skb,
466 struct net_device *dev,
467 unsigned short type,
468 void *daddr,
469 void *saddr,
470 unsigned len);
471 int (*rebuild_header)(struct sk_buff *skb);
472 #define HAVE_MULTICAST
473 void (*set_multicast_list)(struct net_device *dev);
474 #define HAVE_SET_MAC_ADDR
475 int (*set_mac_address)(struct net_device *dev,
476 void *addr);
477 #define HAVE_PRIVATE_IOCTL
478 int (*do_ioctl)(struct net_device *dev,
479 struct ifreq *ifr, int cmd);
480 #define HAVE_SET_CONFIG
481 int (*set_config)(struct net_device *dev,
482 struct ifmap *map);
483 #define HAVE_HEADER_CACHE
484 int (*hard_header_cache)(struct neighbour *neigh,
485 struct hh_cache *hh);
486 void (*header_cache_update)(struct hh_cache *hh,
487 struct net_device *dev,
488 unsigned char * haddr);
489 #define HAVE_CHANGE_MTU
490 int (*change_mtu)(struct net_device *dev, int new_mtu);
491
492 #define HAVE_TX_TIMEOUT
493 void (*tx_timeout) (struct net_device *dev);
494
495 void (*vlan_rx_register)(struct net_device *dev,
496 struct vlan_group *grp);
497 void (*vlan_rx_add_vid)(struct net_device *dev,
498 unsigned short vid);
499 void (*vlan_rx_kill_vid)(struct net_device *dev,
500 unsigned short vid);
501
502 int (*hard_header_parse)(struct sk_buff *skb,
503 unsigned char *haddr);
504 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
505 #ifdef CONFIG_NETPOLL
506 struct netpoll_info *npinfo;
507 #endif
508 #ifdef CONFIG_NET_POLL_CONTROLLER
509 void (*poll_controller)(struct net_device *dev);
510 #endif
511
512 /* bridge stuff */
513 struct net_bridge_port *br_port;
514
515 #ifdef CONFIG_NET_DIVERT
516 /* this will get initialized at each interface type init routine */
517 struct divert_blk *divert;
518 #endif /* CONFIG_NET_DIVERT */
519
520 /* class/net/name entry */
521 struct class_device class_dev;
522 /* space for optional statistics and wireless sysfs groups */
523 struct attribute_group *sysfs_groups[3];
524 };
525
526 #define NETDEV_ALIGN 32
527 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
528
529 static inline void *netdev_priv(struct net_device *dev)
530 {
531 return (char *)dev + ((sizeof(struct net_device)
532 + NETDEV_ALIGN_CONST)
533 & ~NETDEV_ALIGN_CONST);
534 }
535
536 #define SET_MODULE_OWNER(dev) do { } while (0)
537 /* Set the sysfs physical device reference for the network logical device
538 * if set prior to registration will cause a symlink during initialization.
539 */
540 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev))
541
542 struct packet_type {
543 __be16 type; /* This is really htons(ether_type). */
544 struct net_device *dev; /* NULL is wildcarded here */
545 int (*func) (struct sk_buff *,
546 struct net_device *,
547 struct packet_type *,
548 struct net_device *);
549 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
550 int features);
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 err = spin_trylock(&dev->_xmit_lock);
926 if (!err)
927 dev->xmit_lock_owner = smp_processor_id();
928 return err;
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, int inward);
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_size ?
1004 skb_shinfo(skb)->gso_type : 0);
1005 }
1006
1007 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1008 {
1009 return !skb_gso_ok(skb, dev->features);
1010 }
1011
1012 #endif /* __KERNEL__ */
1013
1014 #endif /* _LINUX_DEV_H */
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