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