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, <[email protected]> 12 * Corey Minyard <[email protected]> 13 * Donald J. Becker, <[email protected]> 14 * Alan Cox, <[email protected]> 15 * Bjorn Ekwall. <[email protected]> 16 * Pekka Riikonen <[email protected]> 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 * 23 * Moved to /usr/include/linux for NET3 24 */ 25 #ifndef _LINUX_NETDEVICE_H 26 #define _LINUX_NETDEVICE_H 27 28 #include <linux/if.h> 29 #include <linux/if_ether.h> 30 #include <linux/if_packet.h> 31 32 #ifdef __KERNEL__ 33 #include <asm/atomic.h> 34 #include <asm/cache.h> 35 #include <asm/byteorder.h> 36 37 #include <linux/config.h> 38 #include <linux/device.h> 39 #include <linux/percpu.h> 40 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 throttled; 168 unsigned fastroute_hit; 169 unsigned fastroute_success; 170 unsigned fastroute_defer; 171 unsigned fastroute_deferred_out; 172 unsigned fastroute_latency_reduction; 173 unsigned cpu_collision; 174 }; 175 176 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 177 178 179 /* 180 * We tag multicasts with these structures. 181 */ 182 183 struct dev_mc_list 184 { 185 struct dev_mc_list *next; 186 __u8 dmi_addr[MAX_ADDR_LEN]; 187 unsigned char dmi_addrlen; 188 int dmi_users; 189 int dmi_gusers; 190 }; 191 192 struct hh_cache 193 { 194 struct hh_cache *hh_next; /* Next entry */ 195 atomic_t hh_refcnt; /* number of users */ 196 unsigned short hh_type; /* protocol identifier, f.e ETH_P_IP 197 * NOTE: For VLANs, this will be the 198 * encapuslated type. --BLG 199 */ 200 int hh_len; /* length of header */ 201 int (*hh_output)(struct sk_buff *skb); 202 rwlock_t hh_lock; 203 204 /* cached hardware header; allow for machine alignment needs. */ 205 #define HH_DATA_MOD 16 206 #define HH_DATA_OFF(__len) \ 207 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 208 #define HH_DATA_ALIGN(__len) \ 209 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 210 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 211 }; 212 213 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 214 * Alternative is: 215 * dev->hard_header_len ? (dev->hard_header_len + 216 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 217 * 218 * We could use other alignment values, but we must maintain the 219 * relationship HH alignment <= LL alignment. 220 */ 221 #define LL_RESERVED_SPACE(dev) \ 222 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 223 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 224 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 225 226 /* These flag bits are private to the generic network queueing 227 * layer, they may not be explicitly referenced by any other 228 * code. 229 */ 230 231 enum netdev_state_t 232 { 233 __LINK_STATE_XOFF=0, 234 __LINK_STATE_START, 235 __LINK_STATE_PRESENT, 236 __LINK_STATE_SCHED, 237 __LINK_STATE_NOCARRIER, 238 __LINK_STATE_RX_SCHED, 239 __LINK_STATE_LINKWATCH_PENDING 240 }; 241 242 243 /* 244 * This structure holds at boot time configured netdevice settings. They 245 * are then used in the device probing. 246 */ 247 struct netdev_boot_setup { 248 char name[IFNAMSIZ]; 249 struct ifmap map; 250 }; 251 #define NETDEV_BOOT_SETUP_MAX 8 252 253 254 /* 255 * The DEVICE structure. 256 * Actually, this whole structure is a big mistake. It mixes I/O 257 * data with strictly "high-level" data, and it has to know about 258 * almost every data structure used in the INET module. 259 * 260 * FIXME: cleanup struct net_device such that network protocol info 261 * moves out. 262 */ 263 264 struct net_device 265 { 266 267 /* 268 * This is the first field of the "visible" part of this structure 269 * (i.e. as seen by users in the "Space.c" file). It is the name 270 * the interface. 271 */ 272 char name[IFNAMSIZ]; 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 struct net_device *next_sched; 301 302 /* Interface index. Unique device identifier */ 303 int ifindex; 304 int iflink; 305 306 307 struct net_device_stats* (*get_stats)(struct net_device *dev); 308 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev); 309 310 /* List of functions to handle Wireless Extensions (instead of ioctl). 311 * See <net/iw_handler.h> for details. Jean II */ 312 const struct iw_handler_def * wireless_handlers; 313 /* Instance data managed by the core of Wireless Extensions. */ 314 struct iw_public_data * wireless_data; 315 316 struct ethtool_ops *ethtool_ops; 317 318 /* 319 * This marks the end of the "visible" part of the structure. All 320 * fields hereafter are internal to the system, and may change at 321 * will (read: may be cleaned up at will). 322 */ 323 324 /* These may be needed for future network-power-down code. */ 325 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 326 unsigned long last_rx; /* Time of last Rx */ 327 328 unsigned short flags; /* interface flags (a la BSD) */ 329 unsigned short gflags; 330 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 331 unsigned short padded; /* How much padding added by alloc_netdev() */ 332 333 unsigned mtu; /* interface MTU value */ 334 unsigned short type; /* interface hardware type */ 335 unsigned short hard_header_len; /* hardware hdr length */ 336 void *priv; /* pointer to private data */ 337 338 struct net_device *master; /* Pointer to master device of a group, 339 * which this device is member of. 340 */ 341 342 /* Interface address info. */ 343 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 344 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address */ 345 unsigned char addr_len; /* hardware address length */ 346 unsigned short dev_id; /* for shared network cards */ 347 348 struct dev_mc_list *mc_list; /* Multicast mac addresses */ 349 int mc_count; /* Number of installed mcasts */ 350 int promiscuity; 351 int allmulti; 352 353 int watchdog_timeo; 354 struct timer_list watchdog_timer; 355 356 /* Protocol specific pointers */ 357 358 void *atalk_ptr; /* AppleTalk link */ 359 void *ip_ptr; /* IPv4 specific data */ 360 void *dn_ptr; /* DECnet specific data */ 361 void *ip6_ptr; /* IPv6 specific data */ 362 void *ec_ptr; /* Econet specific data */ 363 void *ax25_ptr; /* AX.25 specific data */ 364 365 struct list_head poll_list; /* Link to poll list */ 366 int quota; 367 int weight; 368 369 struct Qdisc *qdisc; 370 struct Qdisc *qdisc_sleeping; 371 struct Qdisc *qdisc_ingress; 372 struct list_head qdisc_list; 373 unsigned long tx_queue_len; /* Max frames per queue allowed */ 374 375 /* ingress path synchronizer */ 376 spinlock_t ingress_lock; 377 /* hard_start_xmit synchronizer */ 378 spinlock_t xmit_lock; 379 /* cpu id of processor entered to hard_start_xmit or -1, 380 if nobody entered there. 381 */ 382 int xmit_lock_owner; 383 /* device queue lock */ 384 spinlock_t queue_lock; 385 /* Number of references to this device */ 386 atomic_t refcnt; 387 /* delayed register/unregister */ 388 struct list_head todo_list; 389 /* device name hash chain */ 390 struct hlist_node name_hlist; 391 /* device index hash chain */ 392 struct hlist_node index_hlist; 393 394 /* register/unregister state machine */ 395 enum { NETREG_UNINITIALIZED=0, 396 NETREG_REGISTERING, /* called register_netdevice */ 397 NETREG_REGISTERED, /* completed register todo */ 398 NETREG_UNREGISTERING, /* called unregister_netdevice */ 399 NETREG_UNREGISTERED, /* completed unregister todo */ 400 NETREG_RELEASED, /* called free_netdev */ 401 } reg_state; 402 403 /* Net device features */ 404 unsigned long features; 405 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 406 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */ 407 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 408 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 409 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 410 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 411 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 412 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 413 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 414 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 415 #define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */ 416 #define NETIF_F_LLTX 4096 /* LockLess TX */ 417 418 /* Called after device is detached from network. */ 419 void (*uninit)(struct net_device *dev); 420 /* Called after last user reference disappears. */ 421 void (*destructor)(struct net_device *dev); 422 423 /* Pointers to interface service routines. */ 424 int (*open)(struct net_device *dev); 425 int (*stop)(struct net_device *dev); 426 int (*hard_start_xmit) (struct sk_buff *skb, 427 struct net_device *dev); 428 #define HAVE_NETDEV_POLL 429 int (*poll) (struct net_device *dev, int *quota); 430 int (*hard_header) (struct sk_buff *skb, 431 struct net_device *dev, 432 unsigned short type, 433 void *daddr, 434 void *saddr, 435 unsigned len); 436 int (*rebuild_header)(struct sk_buff *skb); 437 #define HAVE_MULTICAST 438 void (*set_multicast_list)(struct net_device *dev); 439 #define HAVE_SET_MAC_ADDR 440 int (*set_mac_address)(struct net_device *dev, 441 void *addr); 442 #define HAVE_PRIVATE_IOCTL 443 int (*do_ioctl)(struct net_device *dev, 444 struct ifreq *ifr, int cmd); 445 #define HAVE_SET_CONFIG 446 int (*set_config)(struct net_device *dev, 447 struct ifmap *map); 448 #define HAVE_HEADER_CACHE 449 int (*hard_header_cache)(struct neighbour *neigh, 450 struct hh_cache *hh); 451 void (*header_cache_update)(struct hh_cache *hh, 452 struct net_device *dev, 453 unsigned char * haddr); 454 #define HAVE_CHANGE_MTU 455 int (*change_mtu)(struct net_device *dev, int new_mtu); 456 457 #define HAVE_TX_TIMEOUT 458 void (*tx_timeout) (struct net_device *dev); 459 460 void (*vlan_rx_register)(struct net_device *dev, 461 struct vlan_group *grp); 462 void (*vlan_rx_add_vid)(struct net_device *dev, 463 unsigned short vid); 464 void (*vlan_rx_kill_vid)(struct net_device *dev, 465 unsigned short vid); 466 467 int (*hard_header_parse)(struct sk_buff *skb, 468 unsigned char *haddr); 469 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 470 #ifdef CONFIG_NETPOLL 471 struct netpoll_info *npinfo; 472 #endif 473 #ifdef CONFIG_NET_POLL_CONTROLLER 474 void (*poll_controller)(struct net_device *dev); 475 #endif 476 477 /* bridge stuff */ 478 struct net_bridge_port *br_port; 479 480 #ifdef CONFIG_NET_DIVERT 481 /* this will get initialized at each interface type init routine */ 482 struct divert_blk *divert; 483 #endif /* CONFIG_NET_DIVERT */ 484 485 /* class/net/name entry */ 486 struct class_device class_dev; 487 }; 488 489 #define NETDEV_ALIGN 32 490 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 491 492 static inline void *netdev_priv(struct net_device *dev) 493 { 494 return (char *)dev + ((sizeof(struct net_device) 495 + NETDEV_ALIGN_CONST) 496 & ~NETDEV_ALIGN_CONST); 497 } 498 499 #define SET_MODULE_OWNER(dev) do { } while (0) 500 /* Set the sysfs physical device reference for the network logical device 501 * if set prior to registration will cause a symlink during initialization. 502 */ 503 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev)) 504 505 struct packet_type { 506 __be16 type; /* This is really htons(ether_type). */ 507 struct net_device *dev; /* NULL is wildcarded here */ 508 int (*func) (struct sk_buff *, struct net_device *, 509 struct packet_type *); 510 void *af_packet_priv; 511 struct list_head list; 512 }; 513 514 #include <linux/interrupt.h> 515 #include <linux/notifier.h> 516 517 extern struct net_device loopback_dev; /* The loopback */ 518 extern struct net_device *dev_base; /* All devices */ 519 extern rwlock_t dev_base_lock; /* Device list lock */ 520 521 extern int netdev_boot_setup_check(struct net_device *dev); 522 extern unsigned long netdev_boot_base(const char *prefix, int unit); 523 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 524 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 525 extern void dev_add_pack(struct packet_type *pt); 526 extern void dev_remove_pack(struct packet_type *pt); 527 extern void __dev_remove_pack(struct packet_type *pt); 528 529 extern struct net_device *dev_get_by_flags(unsigned short flags, 530 unsigned short mask); 531 extern struct net_device *dev_get_by_name(const char *name); 532 extern struct net_device *__dev_get_by_name(const char *name); 533 extern int dev_alloc_name(struct net_device *dev, const char *name); 534 extern int dev_open(struct net_device *dev); 535 extern int dev_close(struct net_device *dev); 536 extern int dev_queue_xmit(struct sk_buff *skb); 537 extern int register_netdevice(struct net_device *dev); 538 extern int unregister_netdevice(struct net_device *dev); 539 extern void free_netdev(struct net_device *dev); 540 extern void synchronize_net(void); 541 extern int register_netdevice_notifier(struct notifier_block *nb); 542 extern int unregister_netdevice_notifier(struct notifier_block *nb); 543 extern int call_netdevice_notifiers(unsigned long val, void *v); 544 extern struct net_device *dev_get_by_index(int ifindex); 545 extern struct net_device *__dev_get_by_index(int ifindex); 546 extern int dev_restart(struct net_device *dev); 547 #ifdef CONFIG_NETPOLL_TRAP 548 extern int netpoll_trap(void); 549 #endif 550 551 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 552 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 553 static inline int unregister_gifconf(unsigned int family) 554 { 555 return register_gifconf(family, NULL); 556 } 557 558 /* 559 * Incoming packets are placed on per-cpu queues so that 560 * no locking is needed. 561 */ 562 563 struct softnet_data 564 { 565 int throttle; 566 int cng_level; 567 int avg_blog; 568 struct sk_buff_head input_pkt_queue; 569 struct list_head poll_list; 570 struct net_device *output_queue; 571 struct sk_buff *completion_queue; 572 573 struct net_device backlog_dev; /* Sorry. 8) */ 574 }; 575 576 DECLARE_PER_CPU(struct softnet_data,softnet_data); 577 578 #define HAVE_NETIF_QUEUE 579 580 static inline void __netif_schedule(struct net_device *dev) 581 { 582 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) { 583 unsigned long flags; 584 struct softnet_data *sd; 585 586 local_irq_save(flags); 587 sd = &__get_cpu_var(softnet_data); 588 dev->next_sched = sd->output_queue; 589 sd->output_queue = dev; 590 raise_softirq_irqoff(NET_TX_SOFTIRQ); 591 local_irq_restore(flags); 592 } 593 } 594 595 static inline void netif_schedule(struct net_device *dev) 596 { 597 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 598 __netif_schedule(dev); 599 } 600 601 static inline void netif_start_queue(struct net_device *dev) 602 { 603 clear_bit(__LINK_STATE_XOFF, &dev->state); 604 } 605 606 static inline void netif_wake_queue(struct net_device *dev) 607 { 608 #ifdef CONFIG_NETPOLL_TRAP 609 if (netpoll_trap()) 610 return; 611 #endif 612 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 613 __netif_schedule(dev); 614 } 615 616 static inline void netif_stop_queue(struct net_device *dev) 617 { 618 #ifdef CONFIG_NETPOLL_TRAP 619 if (netpoll_trap()) 620 return; 621 #endif 622 set_bit(__LINK_STATE_XOFF, &dev->state); 623 } 624 625 static inline int netif_queue_stopped(const struct net_device *dev) 626 { 627 return test_bit(__LINK_STATE_XOFF, &dev->state); 628 } 629 630 static inline int netif_running(const struct net_device *dev) 631 { 632 return test_bit(__LINK_STATE_START, &dev->state); 633 } 634 635 636 /* Use this variant when it is known for sure that it 637 * is executing from interrupt context. 638 */ 639 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 640 { 641 if (atomic_dec_and_test(&skb->users)) { 642 struct softnet_data *sd; 643 unsigned long flags; 644 645 local_irq_save(flags); 646 sd = &__get_cpu_var(softnet_data); 647 skb->next = sd->completion_queue; 648 sd->completion_queue = skb; 649 raise_softirq_irqoff(NET_TX_SOFTIRQ); 650 local_irq_restore(flags); 651 } 652 } 653 654 /* Use this variant in places where it could be invoked 655 * either from interrupt or non-interrupt context. 656 */ 657 static inline void dev_kfree_skb_any(struct sk_buff *skb) 658 { 659 if (in_irq() || irqs_disabled()) 660 dev_kfree_skb_irq(skb); 661 else 662 dev_kfree_skb(skb); 663 } 664 665 #define HAVE_NETIF_RX 1 666 extern int netif_rx(struct sk_buff *skb); 667 extern int netif_rx_ni(struct sk_buff *skb); 668 #define HAVE_NETIF_RECEIVE_SKB 1 669 extern int netif_receive_skb(struct sk_buff *skb); 670 extern int dev_ioctl(unsigned int cmd, void __user *); 671 extern int dev_ethtool(struct ifreq *); 672 extern unsigned dev_get_flags(const struct net_device *); 673 extern int dev_change_flags(struct net_device *, unsigned); 674 extern int dev_change_name(struct net_device *, char *); 675 extern int dev_set_mtu(struct net_device *, int); 676 extern int dev_set_mac_address(struct net_device *, 677 struct sockaddr *); 678 extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 679 680 extern void dev_init(void); 681 682 extern int netdev_nit; 683 684 /* Called by rtnetlink.c:rtnl_unlock() */ 685 extern void netdev_run_todo(void); 686 687 static inline void dev_put(struct net_device *dev) 688 { 689 atomic_dec(&dev->refcnt); 690 } 691 692 #define __dev_put(dev) atomic_dec(&(dev)->refcnt) 693 #define dev_hold(dev) atomic_inc(&(dev)->refcnt) 694 695 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 696 * and _off may be called from IRQ context, but it is caller 697 * who is responsible for serialization of these calls. 698 */ 699 700 extern void linkwatch_fire_event(struct net_device *dev); 701 702 static inline int netif_carrier_ok(const struct net_device *dev) 703 { 704 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 705 } 706 707 extern void __netdev_watchdog_up(struct net_device *dev); 708 709 static inline void netif_carrier_on(struct net_device *dev) 710 { 711 if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) 712 linkwatch_fire_event(dev); 713 if (netif_running(dev)) 714 __netdev_watchdog_up(dev); 715 } 716 717 static inline void netif_carrier_off(struct net_device *dev) 718 { 719 if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) 720 linkwatch_fire_event(dev); 721 } 722 723 /* Hot-plugging. */ 724 static inline int netif_device_present(struct net_device *dev) 725 { 726 return test_bit(__LINK_STATE_PRESENT, &dev->state); 727 } 728 729 static inline void netif_device_detach(struct net_device *dev) 730 { 731 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && 732 netif_running(dev)) { 733 netif_stop_queue(dev); 734 } 735 } 736 737 static inline void netif_device_attach(struct net_device *dev) 738 { 739 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && 740 netif_running(dev)) { 741 netif_wake_queue(dev); 742 __netdev_watchdog_up(dev); 743 } 744 } 745 746 /* 747 * Network interface message level settings 748 */ 749 #define HAVE_NETIF_MSG 1 750 751 enum { 752 NETIF_MSG_DRV = 0x0001, 753 NETIF_MSG_PROBE = 0x0002, 754 NETIF_MSG_LINK = 0x0004, 755 NETIF_MSG_TIMER = 0x0008, 756 NETIF_MSG_IFDOWN = 0x0010, 757 NETIF_MSG_IFUP = 0x0020, 758 NETIF_MSG_RX_ERR = 0x0040, 759 NETIF_MSG_TX_ERR = 0x0080, 760 NETIF_MSG_TX_QUEUED = 0x0100, 761 NETIF_MSG_INTR = 0x0200, 762 NETIF_MSG_TX_DONE = 0x0400, 763 NETIF_MSG_RX_STATUS = 0x0800, 764 NETIF_MSG_PKTDATA = 0x1000, 765 NETIF_MSG_HW = 0x2000, 766 NETIF_MSG_WOL = 0x4000, 767 }; 768 769 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 770 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 771 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 772 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 773 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 774 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 775 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 776 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 777 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 778 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 779 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 780 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 781 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 782 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 783 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 784 785 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 786 { 787 /* use default */ 788 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 789 return default_msg_enable_bits; 790 if (debug_value == 0) /* no output */ 791 return 0; 792 /* set low N bits */ 793 return (1 << debug_value) - 1; 794 } 795 796 /* Schedule rx intr now? */ 797 798 static inline int netif_rx_schedule_prep(struct net_device *dev) 799 { 800 return netif_running(dev) && 801 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state); 802 } 803 804 /* Add interface to tail of rx poll list. This assumes that _prep has 805 * already been called and returned 1. 806 */ 807 808 static inline void __netif_rx_schedule(struct net_device *dev) 809 { 810 unsigned long flags; 811 812 local_irq_save(flags); 813 dev_hold(dev); 814 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 815 if (dev->quota < 0) 816 dev->quota += dev->weight; 817 else 818 dev->quota = dev->weight; 819 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 820 local_irq_restore(flags); 821 } 822 823 /* Try to reschedule poll. Called by irq handler. */ 824 825 static inline void netif_rx_schedule(struct net_device *dev) 826 { 827 if (netif_rx_schedule_prep(dev)) 828 __netif_rx_schedule(dev); 829 } 830 831 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 832 * Do not inline this? 833 */ 834 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 835 { 836 if (netif_rx_schedule_prep(dev)) { 837 unsigned long flags; 838 839 dev->quota += undo; 840 841 local_irq_save(flags); 842 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 843 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 844 local_irq_restore(flags); 845 return 1; 846 } 847 return 0; 848 } 849 850 /* Remove interface from poll list: it must be in the poll list 851 * on current cpu. This primitive is called by dev->poll(), when 852 * it completes the work. The device cannot be out of poll list at this 853 * moment, it is BUG(). 854 */ 855 static inline void netif_rx_complete(struct net_device *dev) 856 { 857 unsigned long flags; 858 859 local_irq_save(flags); 860 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 861 list_del(&dev->poll_list); 862 smp_mb__before_clear_bit(); 863 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 864 local_irq_restore(flags); 865 } 866 867 static inline void netif_poll_disable(struct net_device *dev) 868 { 869 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) { 870 /* No hurry. */ 871 current->state = TASK_INTERRUPTIBLE; 872 schedule_timeout(1); 873 } 874 } 875 876 static inline void netif_poll_enable(struct net_device *dev) 877 { 878 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 879 } 880 881 /* same as netif_rx_complete, except that local_irq_save(flags) 882 * has already been issued 883 */ 884 static inline void __netif_rx_complete(struct net_device *dev) 885 { 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 } 891 892 static inline void netif_tx_disable(struct net_device *dev) 893 { 894 spin_lock_bh(&dev->xmit_lock); 895 netif_stop_queue(dev); 896 spin_unlock_bh(&dev->xmit_lock); 897 } 898 899 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 900 901 extern void ether_setup(struct net_device *dev); 902 903 /* Support for loadable net-drivers */ 904 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name, 905 void (*setup)(struct net_device *)); 906 extern int register_netdev(struct net_device *dev); 907 extern void unregister_netdev(struct net_device *dev); 908 /* Functions used for multicast support */ 909 extern void dev_mc_upload(struct net_device *dev); 910 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 911 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 912 extern void dev_mc_discard(struct net_device *dev); 913 extern void dev_set_promiscuity(struct net_device *dev, int inc); 914 extern void dev_set_allmulti(struct net_device *dev, int inc); 915 extern void netdev_state_change(struct net_device *dev); 916 extern void netdev_features_change(struct net_device *dev); 917 /* Load a device via the kmod */ 918 extern void dev_load(const char *name); 919 extern void dev_mcast_init(void); 920 extern int netdev_max_backlog; 921 extern int weight_p; 922 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 923 extern int skb_checksum_help(struct sk_buff *skb, int inward); 924 /* rx skb timestamps */ 925 extern void net_enable_timestamp(void); 926 extern void net_disable_timestamp(void); 927 928 #endif /* __KERNEL__ */ 929 930 #endif /* _LINUX_DEV_H */ 931