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_UDP << 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_TCP_ECN << NETIF_F_GSO_SHIFT)
321 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
322
323 /* List of features with software fallbacks. */
324 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
325
326 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
327 #define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
328
329 struct net_device *next_sched;
330
331 /* Interface index. Unique device identifier */
332 int ifindex;
333 int iflink;
334
335
336 struct net_device_stats* (*get_stats)(struct net_device *dev);
337 struct iw_statistics* (*get_wireless_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 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 #ifdef CONFIG_NET_DIVERT
520 /* this will get initialized at each interface type init routine */
521 struct divert_blk *divert;
522 #endif /* CONFIG_NET_DIVERT */
523
524 /* class/net/name entry */
525 struct class_device class_dev;
526 /* space for optional statistics and wireless sysfs groups */
527 struct attribute_group *sysfs_groups[3];
528 };
529
530 #define NETDEV_ALIGN 32
531 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
532
netdev_priv(struct net_device * dev)533 static inline void *netdev_priv(struct net_device *dev)
534 {
535 return (char *)dev + ((sizeof(struct net_device)
536 + NETDEV_ALIGN_CONST)
537 & ~NETDEV_ALIGN_CONST);
538 }
539
540 #define SET_MODULE_OWNER(dev) do { } while (0)
541 /* Set the sysfs physical device reference for the network logical device
542 * if set prior to registration will cause a symlink during initialization.
543 */
544 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev))
545
546 struct packet_type {
547 __be16 type; /* This is really htons(ether_type). */
548 struct net_device *dev; /* NULL is wildcarded here */
549 int (*func) (struct sk_buff *,
550 struct net_device *,
551 struct packet_type *,
552 struct net_device *);
553 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
554 int features);
555 int (*gso_send_check)(struct sk_buff *skb);
556 void *af_packet_priv;
557 struct list_head list;
558 };
559
560 #include <linux/interrupt.h>
561 #include <linux/notifier.h>
562
563 extern struct net_device loopback_dev; /* The loopback */
564 extern struct net_device *dev_base; /* All devices */
565 extern rwlock_t dev_base_lock; /* Device list lock */
566
567 extern int netdev_boot_setup_check(struct net_device *dev);
568 extern unsigned long netdev_boot_base(const char *prefix, int unit);
569 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr);
570 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
571 extern void dev_add_pack(struct packet_type *pt);
572 extern void dev_remove_pack(struct packet_type *pt);
573 extern void __dev_remove_pack(struct packet_type *pt);
574
575 extern struct net_device *dev_get_by_flags(unsigned short flags,
576 unsigned short mask);
577 extern struct net_device *dev_get_by_name(const char *name);
578 extern struct net_device *__dev_get_by_name(const char *name);
579 extern int dev_alloc_name(struct net_device *dev, const char *name);
580 extern int dev_open(struct net_device *dev);
581 extern int dev_close(struct net_device *dev);
582 extern int dev_queue_xmit(struct sk_buff *skb);
583 extern int register_netdevice(struct net_device *dev);
584 extern int unregister_netdevice(struct net_device *dev);
585 extern void free_netdev(struct net_device *dev);
586 extern void synchronize_net(void);
587 extern int register_netdevice_notifier(struct notifier_block *nb);
588 extern int unregister_netdevice_notifier(struct notifier_block *nb);
589 extern int call_netdevice_notifiers(unsigned long val, void *v);
590 extern struct net_device *dev_get_by_index(int ifindex);
591 extern struct net_device *__dev_get_by_index(int ifindex);
592 extern int dev_restart(struct net_device *dev);
593 #ifdef CONFIG_NETPOLL_TRAP
594 extern int netpoll_trap(void);
595 #endif
596
597 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
598 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
unregister_gifconf(unsigned int family)599 static inline int unregister_gifconf(unsigned int family)
600 {
601 return register_gifconf(family, NULL);
602 }
603
604 /*
605 * Incoming packets are placed on per-cpu queues so that
606 * no locking is needed.
607 */
608
609 struct softnet_data
610 {
611 struct net_device *output_queue;
612 struct sk_buff_head input_pkt_queue;
613 struct list_head poll_list;
614 struct sk_buff *completion_queue;
615
616 struct net_device backlog_dev; /* Sorry. 8) */
617 #ifdef CONFIG_NET_DMA
618 struct dma_chan *net_dma;
619 #endif
620 };
621
622 DECLARE_PER_CPU(struct softnet_data,softnet_data);
623
624 #define HAVE_NETIF_QUEUE
625
626 extern void __netif_schedule(struct net_device *dev);
627
netif_schedule(struct net_device * dev)628 static inline void netif_schedule(struct net_device *dev)
629 {
630 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
631 __netif_schedule(dev);
632 }
633
netif_start_queue(struct net_device * dev)634 static inline void netif_start_queue(struct net_device *dev)
635 {
636 clear_bit(__LINK_STATE_XOFF, &dev->state);
637 }
638
netif_wake_queue(struct net_device * dev)639 static inline void netif_wake_queue(struct net_device *dev)
640 {
641 #ifdef CONFIG_NETPOLL_TRAP
642 if (netpoll_trap())
643 return;
644 #endif
645 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
646 __netif_schedule(dev);
647 }
648
netif_stop_queue(struct net_device * dev)649 static inline void netif_stop_queue(struct net_device *dev)
650 {
651 #ifdef CONFIG_NETPOLL_TRAP
652 if (netpoll_trap())
653 return;
654 #endif
655 set_bit(__LINK_STATE_XOFF, &dev->state);
656 }
657
netif_queue_stopped(const struct net_device * dev)658 static inline int netif_queue_stopped(const struct net_device *dev)
659 {
660 return test_bit(__LINK_STATE_XOFF, &dev->state);
661 }
662
netif_running(const struct net_device * dev)663 static inline int netif_running(const struct net_device *dev)
664 {
665 return test_bit(__LINK_STATE_START, &dev->state);
666 }
667
668
669 /* Use this variant when it is known for sure that it
670 * is executing from interrupt context.
671 */
dev_kfree_skb_irq(struct sk_buff * skb)672 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
673 {
674 if (atomic_dec_and_test(&skb->users)) {
675 struct softnet_data *sd;
676 unsigned long flags;
677
678 local_irq_save(flags);
679 sd = &__get_cpu_var(softnet_data);
680 skb->next = sd->completion_queue;
681 sd->completion_queue = skb;
682 raise_softirq_irqoff(NET_TX_SOFTIRQ);
683 local_irq_restore(flags);
684 }
685 }
686
687 /* Use this variant in places where it could be invoked
688 * either from interrupt or non-interrupt context.
689 */
690 extern void dev_kfree_skb_any(struct sk_buff *skb);
691
692 #define HAVE_NETIF_RX 1
693 extern int netif_rx(struct sk_buff *skb);
694 extern int netif_rx_ni(struct sk_buff *skb);
695 #define HAVE_NETIF_RECEIVE_SKB 1
696 extern int netif_receive_skb(struct sk_buff *skb);
697 extern int dev_valid_name(const char *name);
698 extern int dev_ioctl(unsigned int cmd, void __user *);
699 extern int dev_ethtool(struct ifreq *);
700 extern unsigned dev_get_flags(const struct net_device *);
701 extern int dev_change_flags(struct net_device *, unsigned);
702 extern int dev_change_name(struct net_device *, char *);
703 extern int dev_set_mtu(struct net_device *, int);
704 extern int dev_set_mac_address(struct net_device *,
705 struct sockaddr *);
706 extern int dev_hard_start_xmit(struct sk_buff *skb,
707 struct net_device *dev);
708
709 extern void dev_init(void);
710
711 extern int netdev_budget;
712
713 /* Called by rtnetlink.c:rtnl_unlock() */
714 extern void netdev_run_todo(void);
715
dev_put(struct net_device * dev)716 static inline void dev_put(struct net_device *dev)
717 {
718 atomic_dec(&dev->refcnt);
719 }
720
dev_hold(struct net_device * dev)721 static inline void dev_hold(struct net_device *dev)
722 {
723 atomic_inc(&dev->refcnt);
724 }
725
726 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
727 * and _off may be called from IRQ context, but it is caller
728 * who is responsible for serialization of these calls.
729 *
730 * The name carrier is inappropriate, these functions should really be
731 * called netif_lowerlayer_*() because they represent the state of any
732 * kind of lower layer not just hardware media.
733 */
734
735 extern void linkwatch_fire_event(struct net_device *dev);
736
netif_carrier_ok(const struct net_device * dev)737 static inline int netif_carrier_ok(const struct net_device *dev)
738 {
739 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
740 }
741
742 extern void __netdev_watchdog_up(struct net_device *dev);
743
744 extern void netif_carrier_on(struct net_device *dev);
745
746 extern void netif_carrier_off(struct net_device *dev);
747
netif_dormant_on(struct net_device * dev)748 static inline void netif_dormant_on(struct net_device *dev)
749 {
750 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
751 linkwatch_fire_event(dev);
752 }
753
netif_dormant_off(struct net_device * dev)754 static inline void netif_dormant_off(struct net_device *dev)
755 {
756 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
757 linkwatch_fire_event(dev);
758 }
759
netif_dormant(const struct net_device * dev)760 static inline int netif_dormant(const struct net_device *dev)
761 {
762 return test_bit(__LINK_STATE_DORMANT, &dev->state);
763 }
764
765
netif_oper_up(const struct net_device * dev)766 static inline int netif_oper_up(const struct net_device *dev) {
767 return (dev->operstate == IF_OPER_UP ||
768 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
769 }
770
771 /* Hot-plugging. */
netif_device_present(struct net_device * dev)772 static inline int netif_device_present(struct net_device *dev)
773 {
774 return test_bit(__LINK_STATE_PRESENT, &dev->state);
775 }
776
777 extern void netif_device_detach(struct net_device *dev);
778
779 extern void netif_device_attach(struct net_device *dev);
780
781 /*
782 * Network interface message level settings
783 */
784 #define HAVE_NETIF_MSG 1
785
786 enum {
787 NETIF_MSG_DRV = 0x0001,
788 NETIF_MSG_PROBE = 0x0002,
789 NETIF_MSG_LINK = 0x0004,
790 NETIF_MSG_TIMER = 0x0008,
791 NETIF_MSG_IFDOWN = 0x0010,
792 NETIF_MSG_IFUP = 0x0020,
793 NETIF_MSG_RX_ERR = 0x0040,
794 NETIF_MSG_TX_ERR = 0x0080,
795 NETIF_MSG_TX_QUEUED = 0x0100,
796 NETIF_MSG_INTR = 0x0200,
797 NETIF_MSG_TX_DONE = 0x0400,
798 NETIF_MSG_RX_STATUS = 0x0800,
799 NETIF_MSG_PKTDATA = 0x1000,
800 NETIF_MSG_HW = 0x2000,
801 NETIF_MSG_WOL = 0x4000,
802 };
803
804 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
805 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
806 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
807 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
808 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
809 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
810 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
811 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
812 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
813 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
814 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
815 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
816 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
817 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
818 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
819
netif_msg_init(int debug_value,int default_msg_enable_bits)820 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
821 {
822 /* use default */
823 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
824 return default_msg_enable_bits;
825 if (debug_value == 0) /* no output */
826 return 0;
827 /* set low N bits */
828 return (1 << debug_value) - 1;
829 }
830
831 /* Test if receive needs to be scheduled */
__netif_rx_schedule_prep(struct net_device * dev)832 static inline int __netif_rx_schedule_prep(struct net_device *dev)
833 {
834 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
835 }
836
837 /* Test if receive needs to be scheduled but only if up */
netif_rx_schedule_prep(struct net_device * dev)838 static inline int netif_rx_schedule_prep(struct net_device *dev)
839 {
840 return netif_running(dev) && __netif_rx_schedule_prep(dev);
841 }
842
843 /* Add interface to tail of rx poll list. This assumes that _prep has
844 * already been called and returned 1.
845 */
846
847 extern void __netif_rx_schedule(struct net_device *dev);
848
849 /* Try to reschedule poll. Called by irq handler. */
850
netif_rx_schedule(struct net_device * dev)851 static inline void netif_rx_schedule(struct net_device *dev)
852 {
853 if (netif_rx_schedule_prep(dev))
854 __netif_rx_schedule(dev);
855 }
856
857 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
858 * Do not inline this?
859 */
netif_rx_reschedule(struct net_device * dev,int undo)860 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
861 {
862 if (netif_rx_schedule_prep(dev)) {
863 unsigned long flags;
864
865 dev->quota += undo;
866
867 local_irq_save(flags);
868 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
869 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
870 local_irq_restore(flags);
871 return 1;
872 }
873 return 0;
874 }
875
876 /* Remove interface from poll list: it must be in the poll list
877 * on current cpu. This primitive is called by dev->poll(), when
878 * it completes the work. The device cannot be out of poll list at this
879 * moment, it is BUG().
880 */
netif_rx_complete(struct net_device * dev)881 static inline void netif_rx_complete(struct net_device *dev)
882 {
883 unsigned long flags;
884
885 local_irq_save(flags);
886 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
887 list_del(&dev->poll_list);
888 smp_mb__before_clear_bit();
889 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
890 local_irq_restore(flags);
891 }
892
netif_poll_disable(struct net_device * dev)893 static inline void netif_poll_disable(struct net_device *dev)
894 {
895 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state))
896 /* No hurry. */
897 schedule_timeout_interruptible(1);
898 }
899
netif_poll_enable(struct net_device * dev)900 static inline void netif_poll_enable(struct net_device *dev)
901 {
902 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
903 }
904
905 /* same as netif_rx_complete, except that local_irq_save(flags)
906 * has already been issued
907 */
__netif_rx_complete(struct net_device * dev)908 static inline void __netif_rx_complete(struct net_device *dev)
909 {
910 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
911 list_del(&dev->poll_list);
912 smp_mb__before_clear_bit();
913 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
914 }
915
netif_tx_lock(struct net_device * dev)916 static inline void netif_tx_lock(struct net_device *dev)
917 {
918 spin_lock(&dev->_xmit_lock);
919 dev->xmit_lock_owner = smp_processor_id();
920 }
921
netif_tx_lock_bh(struct net_device * dev)922 static inline void netif_tx_lock_bh(struct net_device *dev)
923 {
924 spin_lock_bh(&dev->_xmit_lock);
925 dev->xmit_lock_owner = smp_processor_id();
926 }
927
netif_tx_trylock(struct net_device * dev)928 static inline int netif_tx_trylock(struct net_device *dev)
929 {
930 int ok = spin_trylock(&dev->_xmit_lock);
931 if (likely(ok))
932 dev->xmit_lock_owner = smp_processor_id();
933 return ok;
934 }
935
netif_tx_unlock(struct net_device * dev)936 static inline void netif_tx_unlock(struct net_device *dev)
937 {
938 dev->xmit_lock_owner = -1;
939 spin_unlock(&dev->_xmit_lock);
940 }
941
netif_tx_unlock_bh(struct net_device * dev)942 static inline void netif_tx_unlock_bh(struct net_device *dev)
943 {
944 dev->xmit_lock_owner = -1;
945 spin_unlock_bh(&dev->_xmit_lock);
946 }
947
netif_tx_disable(struct net_device * dev)948 static inline void netif_tx_disable(struct net_device *dev)
949 {
950 netif_tx_lock_bh(dev);
951 netif_stop_queue(dev);
952 netif_tx_unlock_bh(dev);
953 }
954
955 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
956
957 extern void ether_setup(struct net_device *dev);
958
959 /* Support for loadable net-drivers */
960 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
961 void (*setup)(struct net_device *));
962 extern int register_netdev(struct net_device *dev);
963 extern void unregister_netdev(struct net_device *dev);
964 /* Functions used for multicast support */
965 extern void dev_mc_upload(struct net_device *dev);
966 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
967 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
968 extern void dev_mc_discard(struct net_device *dev);
969 extern void dev_set_promiscuity(struct net_device *dev, int inc);
970 extern void dev_set_allmulti(struct net_device *dev, int inc);
971 extern void netdev_state_change(struct net_device *dev);
972 extern void netdev_features_change(struct net_device *dev);
973 /* Load a device via the kmod */
974 extern void dev_load(const char *name);
975 extern void dev_mcast_init(void);
976 extern int netdev_max_backlog;
977 extern int weight_p;
978 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
979 extern int skb_checksum_help(struct sk_buff *skb, int inward);
980 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
981 #ifdef CONFIG_BUG
982 extern void netdev_rx_csum_fault(struct net_device *dev);
983 #else
netdev_rx_csum_fault(struct net_device * dev)984 static inline void netdev_rx_csum_fault(struct net_device *dev)
985 {
986 }
987 #endif
988 /* rx skb timestamps */
989 extern void net_enable_timestamp(void);
990 extern void net_disable_timestamp(void);
991
992 #ifdef CONFIG_PROC_FS
993 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
994 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
995 extern void dev_seq_stop(struct seq_file *seq, void *v);
996 #endif
997
998 extern void linkwatch_run_queue(void);
999
net_gso_ok(int features,int gso_type)1000 static inline int net_gso_ok(int features, int gso_type)
1001 {
1002 int feature = gso_type << NETIF_F_GSO_SHIFT;
1003 return (features & feature) == feature;
1004 }
1005
skb_gso_ok(struct sk_buff * skb,int features)1006 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1007 {
1008 return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1009 }
1010
netif_needs_gso(struct net_device * dev,struct sk_buff * skb)1011 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1012 {
1013 return skb_is_gso(skb) &&
1014 (!skb_gso_ok(skb, dev->features) ||
1015 unlikely(skb->ip_summed != CHECKSUM_HW));
1016 }
1017
1018 /* On bonding slaves other than the currently active slave, suppress
1019 * duplicates except for 802.3ad ETH_P_SLOW and alb non-mcast/bcast.
1020 */
skb_bond_should_drop(struct sk_buff * skb)1021 static inline int skb_bond_should_drop(struct sk_buff *skb)
1022 {
1023 struct net_device *dev = skb->dev;
1024 struct net_device *master = dev->master;
1025
1026 if (master &&
1027 (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
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 */
1045