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