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 extern int __init netdev_boot_setup(char *str); 248 249 /* 250 * The DEVICE structure. 251 * Actually, this whole structure is a big mistake. It mixes I/O 252 * data with strictly "high-level" data, and it has to know about 253 * almost every data structure used in the INET module. 254 * 255 * FIXME: cleanup struct net_device such that network protocol info 256 * moves out. 257 */ 258 259 struct net_device 260 { 261 262 /* 263 * This is the first field of the "visible" part of this structure 264 * (i.e. as seen by users in the "Space.c" file). It is the name 265 * the interface. 266 */ 267 char name[IFNAMSIZ]; 268 /* device name hash chain */ 269 struct hlist_node name_hlist; 270 271 /* 272 * I/O specific fields 273 * FIXME: Merge these and struct ifmap into one 274 */ 275 unsigned long mem_end; /* shared mem end */ 276 unsigned long mem_start; /* shared mem start */ 277 unsigned long base_addr; /* device I/O address */ 278 unsigned int irq; /* device IRQ number */ 279 280 /* 281 * Some hardware also needs these fields, but they are not 282 * part of the usual set specified in Space.c. 283 */ 284 285 unsigned char if_port; /* Selectable AUI, TP,..*/ 286 unsigned char dma; /* DMA channel */ 287 288 unsigned long state; 289 290 struct net_device *next; 291 292 /* The device initialization function. Called only once. */ 293 int (*init)(struct net_device *dev); 294 295 /* ------- Fields preinitialized in Space.c finish here ------- */ 296 297 /* Net device features */ 298 unsigned long features; 299 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 300 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */ 301 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 302 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 303 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 304 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 305 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 306 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 307 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 308 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 309 #define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */ 310 #define NETIF_F_LLTX 4096 /* LockLess TX */ 311 #define NETIF_F_UFO 8192 /* Can offload UDP Large Send*/ 312 313 struct net_device *next_sched; 314 315 /* Interface index. Unique device identifier */ 316 int ifindex; 317 int iflink; 318 319 320 struct net_device_stats* (*get_stats)(struct net_device *dev); 321 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev); 322 323 /* List of functions to handle Wireless Extensions (instead of ioctl). 324 * See <net/iw_handler.h> for details. Jean II */ 325 const struct iw_handler_def * wireless_handlers; 326 /* Instance data managed by the core of Wireless Extensions. */ 327 struct iw_public_data * wireless_data; 328 329 struct ethtool_ops *ethtool_ops; 330 331 /* 332 * This marks the end of the "visible" part of the structure. All 333 * fields hereafter are internal to the system, and may change at 334 * will (read: may be cleaned up at will). 335 */ 336 337 338 unsigned short flags; /* interface flags (a la BSD) */ 339 unsigned short gflags; 340 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 341 unsigned short padded; /* How much padding added by alloc_netdev() */ 342 343 unsigned mtu; /* interface MTU value */ 344 unsigned short type; /* interface hardware type */ 345 unsigned short hard_header_len; /* hardware hdr length */ 346 347 struct net_device *master; /* Pointer to master device of a group, 348 * which this device is member of. 349 */ 350 351 /* Interface address info. */ 352 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 353 unsigned char addr_len; /* hardware address length */ 354 unsigned short dev_id; /* for shared network cards */ 355 356 struct dev_mc_list *mc_list; /* Multicast mac addresses */ 357 int mc_count; /* Number of installed mcasts */ 358 int promiscuity; 359 int allmulti; 360 361 362 /* Protocol specific pointers */ 363 364 void *atalk_ptr; /* AppleTalk link */ 365 void *ip_ptr; /* IPv4 specific data */ 366 void *dn_ptr; /* DECnet specific data */ 367 void *ip6_ptr; /* IPv6 specific data */ 368 void *ec_ptr; /* Econet specific data */ 369 void *ax25_ptr; /* AX.25 specific data */ 370 371 /* 372 * Cache line mostly used on receive path (including eth_type_trans()) 373 */ 374 struct list_head poll_list ____cacheline_aligned_in_smp; 375 /* Link to poll list */ 376 377 int (*poll) (struct net_device *dev, int *quota); 378 int quota; 379 int weight; 380 unsigned long last_rx; /* Time of last Rx */ 381 /* Interface address info used in eth_type_trans() */ 382 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 383 because most packets are unicast) */ 384 385 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 386 387 /* 388 * Cache line mostly used on queue transmit path (qdisc) 389 */ 390 /* device queue lock */ 391 spinlock_t queue_lock ____cacheline_aligned_in_smp; 392 struct Qdisc *qdisc; 393 struct Qdisc *qdisc_sleeping; 394 struct list_head qdisc_list; 395 unsigned long tx_queue_len; /* Max frames per queue allowed */ 396 397 /* ingress path synchronizer */ 398 spinlock_t ingress_lock; 399 struct Qdisc *qdisc_ingress; 400 401 /* 402 * One part is mostly used on xmit path (device) 403 */ 404 /* hard_start_xmit synchronizer */ 405 spinlock_t xmit_lock ____cacheline_aligned_in_smp; 406 /* cpu id of processor entered to hard_start_xmit or -1, 407 if nobody entered there. 408 */ 409 int xmit_lock_owner; 410 void *priv; /* pointer to private data */ 411 int (*hard_start_xmit) (struct sk_buff *skb, 412 struct net_device *dev); 413 /* These may be needed for future network-power-down code. */ 414 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 415 416 int watchdog_timeo; /* used by dev_watchdog() */ 417 struct timer_list watchdog_timer; 418 419 /* 420 * refcnt is a very hot point, so align it on SMP 421 */ 422 /* Number of references to this device */ 423 atomic_t refcnt ____cacheline_aligned_in_smp; 424 425 /* delayed register/unregister */ 426 struct list_head todo_list; 427 /* device index hash chain */ 428 struct hlist_node index_hlist; 429 430 /* register/unregister state machine */ 431 enum { NETREG_UNINITIALIZED=0, 432 NETREG_REGISTERING, /* called register_netdevice */ 433 NETREG_REGISTERED, /* completed register todo */ 434 NETREG_UNREGISTERING, /* called unregister_netdevice */ 435 NETREG_UNREGISTERED, /* completed unregister todo */ 436 NETREG_RELEASED, /* called free_netdev */ 437 } reg_state; 438 439 /* Called after device is detached from network. */ 440 void (*uninit)(struct net_device *dev); 441 /* Called after last user reference disappears. */ 442 void (*destructor)(struct net_device *dev); 443 444 /* Pointers to interface service routines. */ 445 int (*open)(struct net_device *dev); 446 int (*stop)(struct net_device *dev); 447 #define HAVE_NETDEV_POLL 448 int (*hard_header) (struct sk_buff *skb, 449 struct net_device *dev, 450 unsigned short type, 451 void *daddr, 452 void *saddr, 453 unsigned len); 454 int (*rebuild_header)(struct sk_buff *skb); 455 #define HAVE_MULTICAST 456 void (*set_multicast_list)(struct net_device *dev); 457 #define HAVE_SET_MAC_ADDR 458 int (*set_mac_address)(struct net_device *dev, 459 void *addr); 460 #define HAVE_PRIVATE_IOCTL 461 int (*do_ioctl)(struct net_device *dev, 462 struct ifreq *ifr, int cmd); 463 #define HAVE_SET_CONFIG 464 int (*set_config)(struct net_device *dev, 465 struct ifmap *map); 466 #define HAVE_HEADER_CACHE 467 int (*hard_header_cache)(struct neighbour *neigh, 468 struct hh_cache *hh); 469 void (*header_cache_update)(struct hh_cache *hh, 470 struct net_device *dev, 471 unsigned char * haddr); 472 #define HAVE_CHANGE_MTU 473 int (*change_mtu)(struct net_device *dev, int new_mtu); 474 475 #define HAVE_TX_TIMEOUT 476 void (*tx_timeout) (struct net_device *dev); 477 478 void (*vlan_rx_register)(struct net_device *dev, 479 struct vlan_group *grp); 480 void (*vlan_rx_add_vid)(struct net_device *dev, 481 unsigned short vid); 482 void (*vlan_rx_kill_vid)(struct net_device *dev, 483 unsigned short vid); 484 485 int (*hard_header_parse)(struct sk_buff *skb, 486 unsigned char *haddr); 487 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 488 #ifdef CONFIG_NETPOLL 489 struct netpoll_info *npinfo; 490 #endif 491 #ifdef CONFIG_NET_POLL_CONTROLLER 492 void (*poll_controller)(struct net_device *dev); 493 #endif 494 495 /* bridge stuff */ 496 struct net_bridge_port *br_port; 497 498 #ifdef CONFIG_NET_DIVERT 499 /* this will get initialized at each interface type init routine */ 500 struct divert_blk *divert; 501 #endif /* CONFIG_NET_DIVERT */ 502 503 /* class/net/name entry */ 504 struct class_device class_dev; 505 }; 506 507 #define NETDEV_ALIGN 32 508 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 509 510 static inline void *netdev_priv(struct net_device *dev) 511 { 512 return (char *)dev + ((sizeof(struct net_device) 513 + NETDEV_ALIGN_CONST) 514 & ~NETDEV_ALIGN_CONST); 515 } 516 517 #define SET_MODULE_OWNER(dev) do { } while (0) 518 /* Set the sysfs physical device reference for the network logical device 519 * if set prior to registration will cause a symlink during initialization. 520 */ 521 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev)) 522 523 struct packet_type { 524 __be16 type; /* This is really htons(ether_type). */ 525 struct net_device *dev; /* NULL is wildcarded here */ 526 int (*func) (struct sk_buff *, 527 struct net_device *, 528 struct packet_type *, 529 struct net_device *); 530 void *af_packet_priv; 531 struct list_head list; 532 }; 533 534 #include <linux/interrupt.h> 535 #include <linux/notifier.h> 536 537 extern struct net_device loopback_dev; /* The loopback */ 538 extern struct net_device *dev_base; /* All devices */ 539 extern rwlock_t dev_base_lock; /* Device list lock */ 540 541 extern int netdev_boot_setup_check(struct net_device *dev); 542 extern unsigned long netdev_boot_base(const char *prefix, int unit); 543 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 544 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 545 extern void dev_add_pack(struct packet_type *pt); 546 extern void dev_remove_pack(struct packet_type *pt); 547 extern void __dev_remove_pack(struct packet_type *pt); 548 549 extern struct net_device *dev_get_by_flags(unsigned short flags, 550 unsigned short mask); 551 extern struct net_device *dev_get_by_name(const char *name); 552 extern struct net_device *__dev_get_by_name(const char *name); 553 extern int dev_alloc_name(struct net_device *dev, const char *name); 554 extern int dev_open(struct net_device *dev); 555 extern int dev_close(struct net_device *dev); 556 extern int dev_queue_xmit(struct sk_buff *skb); 557 extern int register_netdevice(struct net_device *dev); 558 extern int unregister_netdevice(struct net_device *dev); 559 extern void free_netdev(struct net_device *dev); 560 extern void synchronize_net(void); 561 extern int register_netdevice_notifier(struct notifier_block *nb); 562 extern int unregister_netdevice_notifier(struct notifier_block *nb); 563 extern int call_netdevice_notifiers(unsigned long val, void *v); 564 extern struct net_device *dev_get_by_index(int ifindex); 565 extern struct net_device *__dev_get_by_index(int ifindex); 566 extern int dev_restart(struct net_device *dev); 567 #ifdef CONFIG_NETPOLL_TRAP 568 extern int netpoll_trap(void); 569 #endif 570 571 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 572 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 573 static inline int unregister_gifconf(unsigned int family) 574 { 575 return register_gifconf(family, NULL); 576 } 577 578 /* 579 * Incoming packets are placed on per-cpu queues so that 580 * no locking is needed. 581 */ 582 583 struct softnet_data 584 { 585 struct net_device *output_queue; 586 struct sk_buff_head input_pkt_queue; 587 struct list_head poll_list; 588 struct sk_buff *completion_queue; 589 590 struct net_device backlog_dev; /* Sorry. 8) */ 591 }; 592 593 DECLARE_PER_CPU(struct softnet_data,softnet_data); 594 595 #define HAVE_NETIF_QUEUE 596 597 static inline void __netif_schedule(struct net_device *dev) 598 { 599 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) { 600 unsigned long flags; 601 struct softnet_data *sd; 602 603 local_irq_save(flags); 604 sd = &__get_cpu_var(softnet_data); 605 dev->next_sched = sd->output_queue; 606 sd->output_queue = dev; 607 raise_softirq_irqoff(NET_TX_SOFTIRQ); 608 local_irq_restore(flags); 609 } 610 } 611 612 static inline void netif_schedule(struct net_device *dev) 613 { 614 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 615 __netif_schedule(dev); 616 } 617 618 static inline void netif_start_queue(struct net_device *dev) 619 { 620 clear_bit(__LINK_STATE_XOFF, &dev->state); 621 } 622 623 static inline void netif_wake_queue(struct net_device *dev) 624 { 625 #ifdef CONFIG_NETPOLL_TRAP 626 if (netpoll_trap()) 627 return; 628 #endif 629 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 630 __netif_schedule(dev); 631 } 632 633 static inline void netif_stop_queue(struct net_device *dev) 634 { 635 #ifdef CONFIG_NETPOLL_TRAP 636 if (netpoll_trap()) 637 return; 638 #endif 639 set_bit(__LINK_STATE_XOFF, &dev->state); 640 } 641 642 static inline int netif_queue_stopped(const struct net_device *dev) 643 { 644 return test_bit(__LINK_STATE_XOFF, &dev->state); 645 } 646 647 static inline int netif_running(const struct net_device *dev) 648 { 649 return test_bit(__LINK_STATE_START, &dev->state); 650 } 651 652 653 /* Use this variant when it is known for sure that it 654 * is executing from interrupt context. 655 */ 656 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 657 { 658 if (atomic_dec_and_test(&skb->users)) { 659 struct softnet_data *sd; 660 unsigned long flags; 661 662 local_irq_save(flags); 663 sd = &__get_cpu_var(softnet_data); 664 skb->next = sd->completion_queue; 665 sd->completion_queue = skb; 666 raise_softirq_irqoff(NET_TX_SOFTIRQ); 667 local_irq_restore(flags); 668 } 669 } 670 671 /* Use this variant in places where it could be invoked 672 * either from interrupt or non-interrupt context. 673 */ 674 static inline void dev_kfree_skb_any(struct sk_buff *skb) 675 { 676 if (in_irq() || irqs_disabled()) 677 dev_kfree_skb_irq(skb); 678 else 679 dev_kfree_skb(skb); 680 } 681 682 #define HAVE_NETIF_RX 1 683 extern int netif_rx(struct sk_buff *skb); 684 extern int netif_rx_ni(struct sk_buff *skb); 685 #define HAVE_NETIF_RECEIVE_SKB 1 686 extern int netif_receive_skb(struct sk_buff *skb); 687 extern int dev_ioctl(unsigned int cmd, void __user *); 688 extern int dev_ethtool(struct ifreq *); 689 extern unsigned dev_get_flags(const struct net_device *); 690 extern int dev_change_flags(struct net_device *, unsigned); 691 extern int dev_change_name(struct net_device *, char *); 692 extern int dev_set_mtu(struct net_device *, int); 693 extern int dev_set_mac_address(struct net_device *, 694 struct sockaddr *); 695 extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 696 697 extern void dev_init(void); 698 699 extern int netdev_nit; 700 extern int netdev_budget; 701 702 /* Called by rtnetlink.c:rtnl_unlock() */ 703 extern void netdev_run_todo(void); 704 705 static inline void dev_put(struct net_device *dev) 706 { 707 atomic_dec(&dev->refcnt); 708 } 709 710 #define __dev_put(dev) atomic_dec(&(dev)->refcnt) 711 #define dev_hold(dev) atomic_inc(&(dev)->refcnt) 712 713 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 714 * and _off may be called from IRQ context, but it is caller 715 * who is responsible for serialization of these calls. 716 */ 717 718 extern void linkwatch_fire_event(struct net_device *dev); 719 720 static inline int netif_carrier_ok(const struct net_device *dev) 721 { 722 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 723 } 724 725 extern void __netdev_watchdog_up(struct net_device *dev); 726 727 extern void netif_carrier_on(struct net_device *dev); 728 729 extern void netif_carrier_off(struct net_device *dev); 730 731 /* Hot-plugging. */ 732 static inline int netif_device_present(struct net_device *dev) 733 { 734 return test_bit(__LINK_STATE_PRESENT, &dev->state); 735 } 736 737 static inline void netif_device_detach(struct net_device *dev) 738 { 739 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && 740 netif_running(dev)) { 741 netif_stop_queue(dev); 742 } 743 } 744 745 static inline void netif_device_attach(struct net_device *dev) 746 { 747 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && 748 netif_running(dev)) { 749 netif_wake_queue(dev); 750 __netdev_watchdog_up(dev); 751 } 752 } 753 754 /* 755 * Network interface message level settings 756 */ 757 #define HAVE_NETIF_MSG 1 758 759 enum { 760 NETIF_MSG_DRV = 0x0001, 761 NETIF_MSG_PROBE = 0x0002, 762 NETIF_MSG_LINK = 0x0004, 763 NETIF_MSG_TIMER = 0x0008, 764 NETIF_MSG_IFDOWN = 0x0010, 765 NETIF_MSG_IFUP = 0x0020, 766 NETIF_MSG_RX_ERR = 0x0040, 767 NETIF_MSG_TX_ERR = 0x0080, 768 NETIF_MSG_TX_QUEUED = 0x0100, 769 NETIF_MSG_INTR = 0x0200, 770 NETIF_MSG_TX_DONE = 0x0400, 771 NETIF_MSG_RX_STATUS = 0x0800, 772 NETIF_MSG_PKTDATA = 0x1000, 773 NETIF_MSG_HW = 0x2000, 774 NETIF_MSG_WOL = 0x4000, 775 }; 776 777 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 778 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 779 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 780 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 781 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 782 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 783 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 784 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 785 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 786 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 787 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 788 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 789 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 790 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 791 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 792 793 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 794 { 795 /* use default */ 796 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 797 return default_msg_enable_bits; 798 if (debug_value == 0) /* no output */ 799 return 0; 800 /* set low N bits */ 801 return (1 << debug_value) - 1; 802 } 803 804 /* Schedule rx intr now? */ 805 806 static inline int netif_rx_schedule_prep(struct net_device *dev) 807 { 808 return netif_running(dev) && 809 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state); 810 } 811 812 /* Add interface to tail of rx poll list. This assumes that _prep has 813 * already been called and returned 1. 814 */ 815 816 static inline void __netif_rx_schedule(struct net_device *dev) 817 { 818 unsigned long flags; 819 820 local_irq_save(flags); 821 dev_hold(dev); 822 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 823 if (dev->quota < 0) 824 dev->quota += dev->weight; 825 else 826 dev->quota = dev->weight; 827 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 828 local_irq_restore(flags); 829 } 830 831 /* Try to reschedule poll. Called by irq handler. */ 832 833 static inline void netif_rx_schedule(struct net_device *dev) 834 { 835 if (netif_rx_schedule_prep(dev)) 836 __netif_rx_schedule(dev); 837 } 838 839 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 840 * Do not inline this? 841 */ 842 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 843 { 844 if (netif_rx_schedule_prep(dev)) { 845 unsigned long flags; 846 847 dev->quota += undo; 848 849 local_irq_save(flags); 850 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 851 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 852 local_irq_restore(flags); 853 return 1; 854 } 855 return 0; 856 } 857 858 /* Remove interface from poll list: it must be in the poll list 859 * on current cpu. This primitive is called by dev->poll(), when 860 * it completes the work. The device cannot be out of poll list at this 861 * moment, it is BUG(). 862 */ 863 static inline void netif_rx_complete(struct net_device *dev) 864 { 865 unsigned long flags; 866 867 local_irq_save(flags); 868 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 869 list_del(&dev->poll_list); 870 smp_mb__before_clear_bit(); 871 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 872 local_irq_restore(flags); 873 } 874 875 static inline void netif_poll_disable(struct net_device *dev) 876 { 877 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) 878 /* No hurry. */ 879 schedule_timeout_interruptible(1); 880 } 881 882 static inline void netif_poll_enable(struct net_device *dev) 883 { 884 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 885 } 886 887 /* same as netif_rx_complete, except that local_irq_save(flags) 888 * has already been issued 889 */ 890 static inline void __netif_rx_complete(struct net_device *dev) 891 { 892 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 893 list_del(&dev->poll_list); 894 smp_mb__before_clear_bit(); 895 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 896 } 897 898 static inline void netif_tx_disable(struct net_device *dev) 899 { 900 spin_lock_bh(&dev->xmit_lock); 901 netif_stop_queue(dev); 902 spin_unlock_bh(&dev->xmit_lock); 903 } 904 905 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 906 907 extern void ether_setup(struct net_device *dev); 908 909 /* Support for loadable net-drivers */ 910 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name, 911 void (*setup)(struct net_device *)); 912 extern int register_netdev(struct net_device *dev); 913 extern void unregister_netdev(struct net_device *dev); 914 /* Functions used for multicast support */ 915 extern void dev_mc_upload(struct net_device *dev); 916 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 917 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 918 extern void dev_mc_discard(struct net_device *dev); 919 extern void dev_set_promiscuity(struct net_device *dev, int inc); 920 extern void dev_set_allmulti(struct net_device *dev, int inc); 921 extern void netdev_state_change(struct net_device *dev); 922 extern void netdev_features_change(struct net_device *dev); 923 /* Load a device via the kmod */ 924 extern void dev_load(const char *name); 925 extern void dev_mcast_init(void); 926 extern int netdev_max_backlog; 927 extern int weight_p; 928 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 929 extern int skb_checksum_help(struct sk_buff *skb, int inward); 930 /* rx skb timestamps */ 931 extern void net_enable_timestamp(void); 932 extern void net_disable_timestamp(void); 933 934 #ifdef CONFIG_PROC_FS 935 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 936 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 937 extern void dev_seq_stop(struct seq_file *seq, void *v); 938 #endif 939 940 extern void linkwatch_run_queue(void); 941 942 #endif /* __KERNEL__ */ 943 944 #endif /* _LINUX_DEV_H */ 945