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 __LINK_STATE_DORMANT, 235 }; 236 237 238 /* 239 * This structure holds at boot time configured netdevice settings. They 240 * are then used in the device probing. 241 */ 242 struct netdev_boot_setup { 243 char name[IFNAMSIZ]; 244 struct ifmap map; 245 }; 246 #define NETDEV_BOOT_SETUP_MAX 8 247 248 extern int __init netdev_boot_setup(char *str); 249 250 /* 251 * The DEVICE structure. 252 * Actually, this whole structure is a big mistake. It mixes I/O 253 * data with strictly "high-level" data, and it has to know about 254 * almost every data structure used in the INET module. 255 * 256 * FIXME: cleanup struct net_device such that network protocol info 257 * moves out. 258 */ 259 260 struct net_device 261 { 262 263 /* 264 * This is the first field of the "visible" part of this structure 265 * (i.e. as seen by users in the "Space.c" file). It is the name 266 * the interface. 267 */ 268 char name[IFNAMSIZ]; 269 /* device name hash chain */ 270 struct hlist_node name_hlist; 271 272 /* 273 * I/O specific fields 274 * FIXME: Merge these and struct ifmap into one 275 */ 276 unsigned long mem_end; /* shared mem end */ 277 unsigned long mem_start; /* shared mem start */ 278 unsigned long base_addr; /* device I/O address */ 279 unsigned int irq; /* device IRQ number */ 280 281 /* 282 * Some hardware also needs these fields, but they are not 283 * part of the usual set specified in Space.c. 284 */ 285 286 unsigned char if_port; /* Selectable AUI, TP,..*/ 287 unsigned char dma; /* DMA channel */ 288 289 unsigned long state; 290 291 struct net_device *next; 292 293 /* The device initialization function. Called only once. */ 294 int (*init)(struct net_device *dev); 295 296 /* ------- Fields preinitialized in Space.c finish here ------- */ 297 298 /* Net device features */ 299 unsigned long features; 300 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 301 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */ 302 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 303 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 304 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 305 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 306 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 307 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 308 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 309 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 310 #define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */ 311 #define NETIF_F_LLTX 4096 /* LockLess TX */ 312 #define NETIF_F_UFO 8192 /* Can offload UDP Large Send*/ 313 314 struct net_device *next_sched; 315 316 /* Interface index. Unique device identifier */ 317 int ifindex; 318 int iflink; 319 320 321 struct net_device_stats* (*get_stats)(struct net_device *dev); 322 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev); 323 324 /* List of functions to handle Wireless Extensions (instead of ioctl). 325 * See <net/iw_handler.h> for details. Jean II */ 326 const struct iw_handler_def * wireless_handlers; 327 /* Instance data managed by the core of Wireless Extensions. */ 328 struct iw_public_data * wireless_data; 329 330 struct ethtool_ops *ethtool_ops; 331 332 /* 333 * This marks the end of the "visible" part of the structure. All 334 * fields hereafter are internal to the system, and may change at 335 * will (read: may be cleaned up at will). 336 */ 337 338 339 unsigned int flags; /* interface flags (a la BSD) */ 340 unsigned short gflags; 341 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 342 unsigned short padded; /* How much padding added by alloc_netdev() */ 343 344 unsigned char operstate; /* RFC2863 operstate */ 345 unsigned char link_mode; /* mapping policy to operstate */ 346 347 unsigned mtu; /* interface MTU value */ 348 unsigned short type; /* interface hardware type */ 349 unsigned short hard_header_len; /* hardware hdr length */ 350 351 struct net_device *master; /* Pointer to master device of a group, 352 * which this device is member of. 353 */ 354 355 /* Interface address info. */ 356 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 357 unsigned char addr_len; /* hardware address length */ 358 unsigned short dev_id; /* for shared network cards */ 359 360 struct dev_mc_list *mc_list; /* Multicast mac addresses */ 361 int mc_count; /* Number of installed mcasts */ 362 int promiscuity; 363 int allmulti; 364 365 366 /* Protocol specific pointers */ 367 368 void *atalk_ptr; /* AppleTalk link */ 369 void *ip_ptr; /* IPv4 specific data */ 370 void *dn_ptr; /* DECnet specific data */ 371 void *ip6_ptr; /* IPv6 specific data */ 372 void *ec_ptr; /* Econet specific data */ 373 void *ax25_ptr; /* AX.25 specific data */ 374 375 /* 376 * Cache line mostly used on receive path (including eth_type_trans()) 377 */ 378 struct list_head poll_list ____cacheline_aligned_in_smp; 379 /* Link to poll list */ 380 381 int (*poll) (struct net_device *dev, int *quota); 382 int quota; 383 int weight; 384 unsigned long last_rx; /* Time of last Rx */ 385 /* Interface address info used in eth_type_trans() */ 386 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 387 because most packets are unicast) */ 388 389 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 390 391 /* 392 * Cache line mostly used on queue transmit path (qdisc) 393 */ 394 /* device queue lock */ 395 spinlock_t queue_lock ____cacheline_aligned_in_smp; 396 struct Qdisc *qdisc; 397 struct Qdisc *qdisc_sleeping; 398 struct list_head qdisc_list; 399 unsigned long tx_queue_len; /* Max frames per queue allowed */ 400 401 /* ingress path synchronizer */ 402 spinlock_t ingress_lock; 403 struct Qdisc *qdisc_ingress; 404 405 /* 406 * One part is mostly used on xmit path (device) 407 */ 408 /* hard_start_xmit synchronizer */ 409 spinlock_t xmit_lock ____cacheline_aligned_in_smp; 410 /* cpu id of processor entered to hard_start_xmit or -1, 411 if nobody entered there. 412 */ 413 int xmit_lock_owner; 414 void *priv; /* pointer to private data */ 415 int (*hard_start_xmit) (struct sk_buff *skb, 416 struct net_device *dev); 417 /* These may be needed for future network-power-down code. */ 418 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 419 420 int watchdog_timeo; /* used by dev_watchdog() */ 421 struct timer_list watchdog_timer; 422 423 /* 424 * refcnt is a very hot point, so align it on SMP 425 */ 426 /* Number of references to this device */ 427 atomic_t refcnt ____cacheline_aligned_in_smp; 428 429 /* delayed register/unregister */ 430 struct list_head todo_list; 431 /* device index hash chain */ 432 struct hlist_node index_hlist; 433 434 /* register/unregister state machine */ 435 enum { NETREG_UNINITIALIZED=0, 436 NETREG_REGISTERED, /* completed register_netdevice */ 437 NETREG_UNREGISTERING, /* called unregister_netdevice */ 438 NETREG_UNREGISTERED, /* completed unregister todo */ 439 NETREG_RELEASED, /* called free_netdev */ 440 } reg_state; 441 442 /* Called after device is detached from network. */ 443 void (*uninit)(struct net_device *dev); 444 /* Called after last user reference disappears. */ 445 void (*destructor)(struct net_device *dev); 446 447 /* Pointers to interface service routines. */ 448 int (*open)(struct net_device *dev); 449 int (*stop)(struct net_device *dev); 450 #define HAVE_NETDEV_POLL 451 int (*hard_header) (struct sk_buff *skb, 452 struct net_device *dev, 453 unsigned short type, 454 void *daddr, 455 void *saddr, 456 unsigned len); 457 int (*rebuild_header)(struct sk_buff *skb); 458 #define HAVE_MULTICAST 459 void (*set_multicast_list)(struct net_device *dev); 460 #define HAVE_SET_MAC_ADDR 461 int (*set_mac_address)(struct net_device *dev, 462 void *addr); 463 #define HAVE_PRIVATE_IOCTL 464 int (*do_ioctl)(struct net_device *dev, 465 struct ifreq *ifr, int cmd); 466 #define HAVE_SET_CONFIG 467 int (*set_config)(struct net_device *dev, 468 struct ifmap *map); 469 #define HAVE_HEADER_CACHE 470 int (*hard_header_cache)(struct neighbour *neigh, 471 struct hh_cache *hh); 472 void (*header_cache_update)(struct hh_cache *hh, 473 struct net_device *dev, 474 unsigned char * haddr); 475 #define HAVE_CHANGE_MTU 476 int (*change_mtu)(struct net_device *dev, int new_mtu); 477 478 #define HAVE_TX_TIMEOUT 479 void (*tx_timeout) (struct net_device *dev); 480 481 void (*vlan_rx_register)(struct net_device *dev, 482 struct vlan_group *grp); 483 void (*vlan_rx_add_vid)(struct net_device *dev, 484 unsigned short vid); 485 void (*vlan_rx_kill_vid)(struct net_device *dev, 486 unsigned short vid); 487 488 int (*hard_header_parse)(struct sk_buff *skb, 489 unsigned char *haddr); 490 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 491 #ifdef CONFIG_NETPOLL 492 struct netpoll_info *npinfo; 493 #endif 494 #ifdef CONFIG_NET_POLL_CONTROLLER 495 void (*poll_controller)(struct net_device *dev); 496 #endif 497 498 /* bridge stuff */ 499 struct net_bridge_port *br_port; 500 501 #ifdef CONFIG_NET_DIVERT 502 /* this will get initialized at each interface type init routine */ 503 struct divert_blk *divert; 504 #endif /* CONFIG_NET_DIVERT */ 505 506 /* class/net/name entry */ 507 struct class_device class_dev; 508 /* space for optional statistics and wireless sysfs groups */ 509 struct attribute_group *sysfs_groups[3]; 510 }; 511 512 #define NETDEV_ALIGN 32 513 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 514 515 static inline void *netdev_priv(struct net_device *dev) 516 { 517 return (char *)dev + ((sizeof(struct net_device) 518 + NETDEV_ALIGN_CONST) 519 & ~NETDEV_ALIGN_CONST); 520 } 521 522 #define SET_MODULE_OWNER(dev) do { } while (0) 523 /* Set the sysfs physical device reference for the network logical device 524 * if set prior to registration will cause a symlink during initialization. 525 */ 526 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev)) 527 528 struct packet_type { 529 __be16 type; /* This is really htons(ether_type). */ 530 struct net_device *dev; /* NULL is wildcarded here */ 531 int (*func) (struct sk_buff *, 532 struct net_device *, 533 struct packet_type *, 534 struct net_device *); 535 void *af_packet_priv; 536 struct list_head list; 537 }; 538 539 #include <linux/interrupt.h> 540 #include <linux/notifier.h> 541 542 extern struct net_device loopback_dev; /* The loopback */ 543 extern struct net_device *dev_base; /* All devices */ 544 extern rwlock_t dev_base_lock; /* Device list lock */ 545 546 extern int netdev_boot_setup_check(struct net_device *dev); 547 extern unsigned long netdev_boot_base(const char *prefix, int unit); 548 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 549 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 550 extern void dev_add_pack(struct packet_type *pt); 551 extern void dev_remove_pack(struct packet_type *pt); 552 extern void __dev_remove_pack(struct packet_type *pt); 553 554 extern struct net_device *dev_get_by_flags(unsigned short flags, 555 unsigned short mask); 556 extern struct net_device *dev_get_by_name(const char *name); 557 extern struct net_device *__dev_get_by_name(const char *name); 558 extern int dev_alloc_name(struct net_device *dev, const char *name); 559 extern int dev_open(struct net_device *dev); 560 extern int dev_close(struct net_device *dev); 561 extern int dev_queue_xmit(struct sk_buff *skb); 562 extern int register_netdevice(struct net_device *dev); 563 extern int unregister_netdevice(struct net_device *dev); 564 extern void free_netdev(struct net_device *dev); 565 extern void synchronize_net(void); 566 extern int register_netdevice_notifier(struct notifier_block *nb); 567 extern int unregister_netdevice_notifier(struct notifier_block *nb); 568 extern int call_netdevice_notifiers(unsigned long val, void *v); 569 extern struct net_device *dev_get_by_index(int ifindex); 570 extern struct net_device *__dev_get_by_index(int ifindex); 571 extern int dev_restart(struct net_device *dev); 572 #ifdef CONFIG_NETPOLL_TRAP 573 extern int netpoll_trap(void); 574 #endif 575 576 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 577 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 578 static inline int unregister_gifconf(unsigned int family) 579 { 580 return register_gifconf(family, NULL); 581 } 582 583 /* 584 * Incoming packets are placed on per-cpu queues so that 585 * no locking is needed. 586 */ 587 588 struct softnet_data 589 { 590 struct net_device *output_queue; 591 struct sk_buff_head input_pkt_queue; 592 struct list_head poll_list; 593 struct sk_buff *completion_queue; 594 595 struct net_device backlog_dev; /* Sorry. 8) */ 596 }; 597 598 DECLARE_PER_CPU(struct softnet_data,softnet_data); 599 600 #define HAVE_NETIF_QUEUE 601 602 extern void __netif_schedule(struct net_device *dev); 603 604 static inline void netif_schedule(struct net_device *dev) 605 { 606 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 607 __netif_schedule(dev); 608 } 609 610 static inline void netif_start_queue(struct net_device *dev) 611 { 612 clear_bit(__LINK_STATE_XOFF, &dev->state); 613 } 614 615 static inline void netif_wake_queue(struct net_device *dev) 616 { 617 #ifdef CONFIG_NETPOLL_TRAP 618 if (netpoll_trap()) 619 return; 620 #endif 621 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 622 __netif_schedule(dev); 623 } 624 625 static inline void netif_stop_queue(struct net_device *dev) 626 { 627 #ifdef CONFIG_NETPOLL_TRAP 628 if (netpoll_trap()) 629 return; 630 #endif 631 set_bit(__LINK_STATE_XOFF, &dev->state); 632 } 633 634 static inline int netif_queue_stopped(const struct net_device *dev) 635 { 636 return test_bit(__LINK_STATE_XOFF, &dev->state); 637 } 638 639 static inline int netif_running(const struct net_device *dev) 640 { 641 return test_bit(__LINK_STATE_START, &dev->state); 642 } 643 644 645 /* Use this variant when it is known for sure that it 646 * is executing from interrupt context. 647 */ 648 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 649 { 650 if (atomic_dec_and_test(&skb->users)) { 651 struct softnet_data *sd; 652 unsigned long flags; 653 654 local_irq_save(flags); 655 sd = &__get_cpu_var(softnet_data); 656 skb->next = sd->completion_queue; 657 sd->completion_queue = skb; 658 raise_softirq_irqoff(NET_TX_SOFTIRQ); 659 local_irq_restore(flags); 660 } 661 } 662 663 /* Use this variant in places where it could be invoked 664 * either from interrupt or non-interrupt context. 665 */ 666 extern void dev_kfree_skb_any(struct sk_buff *skb); 667 668 #define HAVE_NETIF_RX 1 669 extern int netif_rx(struct sk_buff *skb); 670 extern int netif_rx_ni(struct sk_buff *skb); 671 #define HAVE_NETIF_RECEIVE_SKB 1 672 extern int netif_receive_skb(struct sk_buff *skb); 673 extern int dev_valid_name(const char *name); 674 extern int dev_ioctl(unsigned int cmd, void __user *); 675 extern int dev_ethtool(struct ifreq *); 676 extern unsigned dev_get_flags(const struct net_device *); 677 extern int dev_change_flags(struct net_device *, unsigned); 678 extern int dev_change_name(struct net_device *, char *); 679 extern int dev_set_mtu(struct net_device *, int); 680 extern int dev_set_mac_address(struct net_device *, 681 struct sockaddr *); 682 extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 683 684 extern void dev_init(void); 685 686 extern int netdev_nit; 687 extern int netdev_budget; 688 689 /* Called by rtnetlink.c:rtnl_unlock() */ 690 extern void netdev_run_todo(void); 691 692 static inline void dev_put(struct net_device *dev) 693 { 694 atomic_dec(&dev->refcnt); 695 } 696 697 static inline void dev_hold(struct net_device *dev) 698 { 699 atomic_inc(&dev->refcnt); 700 } 701 702 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 703 * and _off may be called from IRQ context, but it is caller 704 * who is responsible for serialization of these calls. 705 * 706 * The name carrier is inappropriate, these functions should really be 707 * called netif_lowerlayer_*() because they represent the state of any 708 * kind of lower layer not just hardware media. 709 */ 710 711 extern void linkwatch_fire_event(struct net_device *dev); 712 713 static inline int netif_carrier_ok(const struct net_device *dev) 714 { 715 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 716 } 717 718 extern void __netdev_watchdog_up(struct net_device *dev); 719 720 extern void netif_carrier_on(struct net_device *dev); 721 722 extern void netif_carrier_off(struct net_device *dev); 723 724 static inline void netif_dormant_on(struct net_device *dev) 725 { 726 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 727 linkwatch_fire_event(dev); 728 } 729 730 static inline void netif_dormant_off(struct net_device *dev) 731 { 732 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 733 linkwatch_fire_event(dev); 734 } 735 736 static inline int netif_dormant(const struct net_device *dev) 737 { 738 return test_bit(__LINK_STATE_DORMANT, &dev->state); 739 } 740 741 742 static inline int netif_oper_up(const struct net_device *dev) { 743 return (dev->operstate == IF_OPER_UP || 744 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 745 } 746 747 /* Hot-plugging. */ 748 static inline int netif_device_present(struct net_device *dev) 749 { 750 return test_bit(__LINK_STATE_PRESENT, &dev->state); 751 } 752 753 extern void netif_device_detach(struct net_device *dev); 754 755 extern void netif_device_attach(struct net_device *dev); 756 757 /* 758 * Network interface message level settings 759 */ 760 #define HAVE_NETIF_MSG 1 761 762 enum { 763 NETIF_MSG_DRV = 0x0001, 764 NETIF_MSG_PROBE = 0x0002, 765 NETIF_MSG_LINK = 0x0004, 766 NETIF_MSG_TIMER = 0x0008, 767 NETIF_MSG_IFDOWN = 0x0010, 768 NETIF_MSG_IFUP = 0x0020, 769 NETIF_MSG_RX_ERR = 0x0040, 770 NETIF_MSG_TX_ERR = 0x0080, 771 NETIF_MSG_TX_QUEUED = 0x0100, 772 NETIF_MSG_INTR = 0x0200, 773 NETIF_MSG_TX_DONE = 0x0400, 774 NETIF_MSG_RX_STATUS = 0x0800, 775 NETIF_MSG_PKTDATA = 0x1000, 776 NETIF_MSG_HW = 0x2000, 777 NETIF_MSG_WOL = 0x4000, 778 }; 779 780 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 781 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 782 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 783 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 784 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 785 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 786 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 787 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 788 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 789 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 790 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 791 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 792 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 793 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 794 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 795 796 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 797 { 798 /* use default */ 799 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 800 return default_msg_enable_bits; 801 if (debug_value == 0) /* no output */ 802 return 0; 803 /* set low N bits */ 804 return (1 << debug_value) - 1; 805 } 806 807 /* Test if receive needs to be scheduled */ 808 static inline int __netif_rx_schedule_prep(struct net_device *dev) 809 { 810 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state); 811 } 812 813 /* Test if receive needs to be scheduled but only if up */ 814 static inline int netif_rx_schedule_prep(struct net_device *dev) 815 { 816 return netif_running(dev) && __netif_rx_schedule_prep(dev); 817 } 818 819 /* Add interface to tail of rx poll list. This assumes that _prep has 820 * already been called and returned 1. 821 */ 822 823 extern void __netif_rx_schedule(struct net_device *dev); 824 825 /* Try to reschedule poll. Called by irq handler. */ 826 827 static inline void netif_rx_schedule(struct net_device *dev) 828 { 829 if (netif_rx_schedule_prep(dev)) 830 __netif_rx_schedule(dev); 831 } 832 833 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 834 * Do not inline this? 835 */ 836 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 837 { 838 if (netif_rx_schedule_prep(dev)) { 839 unsigned long flags; 840 841 dev->quota += undo; 842 843 local_irq_save(flags); 844 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 845 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 846 local_irq_restore(flags); 847 return 1; 848 } 849 return 0; 850 } 851 852 /* Remove interface from poll list: it must be in the poll list 853 * on current cpu. This primitive is called by dev->poll(), when 854 * it completes the work. The device cannot be out of poll list at this 855 * moment, it is BUG(). 856 */ 857 static inline void netif_rx_complete(struct net_device *dev) 858 { 859 unsigned long flags; 860 861 local_irq_save(flags); 862 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 863 list_del(&dev->poll_list); 864 smp_mb__before_clear_bit(); 865 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 866 local_irq_restore(flags); 867 } 868 869 static inline void netif_poll_disable(struct net_device *dev) 870 { 871 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) 872 /* No hurry. */ 873 schedule_timeout_interruptible(1); 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 #ifdef CONFIG_BUG 925 extern void netdev_rx_csum_fault(struct net_device *dev); 926 #else 927 static inline void netdev_rx_csum_fault(struct net_device *dev) 928 { 929 } 930 #endif 931 /* rx skb timestamps */ 932 extern void net_enable_timestamp(void); 933 extern void net_disable_timestamp(void); 934 935 #ifdef CONFIG_PROC_FS 936 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 937 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 938 extern void dev_seq_stop(struct seq_file *seq, void *v); 939 #endif 940 941 extern void linkwatch_run_queue(void); 942 943 #endif /* __KERNEL__ */ 944 945 #endif /* _LINUX_DEV_H */ 946