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/device.h> 38 #include <linux/percpu.h> 39 #include <linux/dmaengine.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 __LINK_STATE_QDISC_RUNNING, 236 }; 237 238 239 /* 240 * This structure holds at boot time configured netdevice settings. They 241 * are then used in the device probing. 242 */ 243 struct netdev_boot_setup { 244 char name[IFNAMSIZ]; 245 struct ifmap map; 246 }; 247 #define NETDEV_BOOT_SETUP_MAX 8 248 249 extern int __init netdev_boot_setup(char *str); 250 251 /* 252 * The DEVICE structure. 253 * Actually, this whole structure is a big mistake. It mixes I/O 254 * data with strictly "high-level" data, and it has to know about 255 * almost every data structure used in the INET module. 256 * 257 * FIXME: cleanup struct net_device such that network protocol info 258 * moves out. 259 */ 260 261 struct net_device 262 { 263 264 /* 265 * This is the first field of the "visible" part of this structure 266 * (i.e. as seen by users in the "Space.c" file). It is the name 267 * the interface. 268 */ 269 char name[IFNAMSIZ]; 270 /* device name hash chain */ 271 struct hlist_node name_hlist; 272 273 /* 274 * I/O specific fields 275 * FIXME: Merge these and struct ifmap into one 276 */ 277 unsigned long mem_end; /* shared mem end */ 278 unsigned long mem_start; /* shared mem start */ 279 unsigned long base_addr; /* device I/O address */ 280 unsigned int irq; /* device IRQ number */ 281 282 /* 283 * Some hardware also needs these fields, but they are not 284 * part of the usual set specified in Space.c. 285 */ 286 287 unsigned char if_port; /* Selectable AUI, TP,..*/ 288 unsigned char dma; /* DMA channel */ 289 290 unsigned long state; 291 292 struct net_device *next; 293 294 /* The device initialization function. Called only once. */ 295 int (*init)(struct net_device *dev); 296 297 /* ------- Fields preinitialized in Space.c finish here ------- */ 298 299 /* Net device features */ 300 unsigned long features; 301 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 302 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */ 303 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 304 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 305 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 306 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 307 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 308 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 309 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 310 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 311 #define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */ 312 #define NETIF_F_LLTX 4096 /* LockLess TX */ 313 #define NETIF_F_UFO 8192 /* Can offload UDP Large Send*/ 314 315 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 316 #define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM) 317 318 struct net_device *next_sched; 319 320 /* Interface index. Unique device identifier */ 321 int ifindex; 322 int iflink; 323 324 325 struct net_device_stats* (*get_stats)(struct net_device *dev); 326 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev); 327 328 /* List of functions to handle Wireless Extensions (instead of ioctl). 329 * See <net/iw_handler.h> for details. Jean II */ 330 const struct iw_handler_def * wireless_handlers; 331 /* Instance data managed by the core of Wireless Extensions. */ 332 struct iw_public_data * wireless_data; 333 334 struct ethtool_ops *ethtool_ops; 335 336 /* 337 * This marks the end of the "visible" part of the structure. All 338 * fields hereafter are internal to the system, and may change at 339 * will (read: may be cleaned up at will). 340 */ 341 342 343 unsigned int flags; /* interface flags (a la BSD) */ 344 unsigned short gflags; 345 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 346 unsigned short padded; /* How much padding added by alloc_netdev() */ 347 348 unsigned char operstate; /* RFC2863 operstate */ 349 unsigned char link_mode; /* mapping policy to operstate */ 350 351 unsigned mtu; /* interface MTU value */ 352 unsigned short type; /* interface hardware type */ 353 unsigned short hard_header_len; /* hardware hdr length */ 354 355 struct net_device *master; /* Pointer to master device of a group, 356 * which this device is member of. 357 */ 358 359 /* Interface address info. */ 360 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 361 unsigned char addr_len; /* hardware address length */ 362 unsigned short dev_id; /* for shared network cards */ 363 364 struct dev_mc_list *mc_list; /* Multicast mac addresses */ 365 int mc_count; /* Number of installed mcasts */ 366 int promiscuity; 367 int allmulti; 368 369 370 /* Protocol specific pointers */ 371 372 void *atalk_ptr; /* AppleTalk link */ 373 void *ip_ptr; /* IPv4 specific data */ 374 void *dn_ptr; /* DECnet specific data */ 375 void *ip6_ptr; /* IPv6 specific data */ 376 void *ec_ptr; /* Econet specific data */ 377 void *ax25_ptr; /* AX.25 specific data */ 378 379 /* 380 * Cache line mostly used on receive path (including eth_type_trans()) 381 */ 382 struct list_head poll_list ____cacheline_aligned_in_smp; 383 /* Link to poll list */ 384 385 int (*poll) (struct net_device *dev, int *quota); 386 int quota; 387 int weight; 388 unsigned long last_rx; /* Time of last Rx */ 389 /* Interface address info used in eth_type_trans() */ 390 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 391 because most packets are unicast) */ 392 393 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 394 395 /* 396 * Cache line mostly used on queue transmit path (qdisc) 397 */ 398 /* device queue lock */ 399 spinlock_t queue_lock ____cacheline_aligned_in_smp; 400 struct Qdisc *qdisc; 401 struct Qdisc *qdisc_sleeping; 402 struct list_head qdisc_list; 403 unsigned long tx_queue_len; /* Max frames per queue allowed */ 404 405 /* ingress path synchronizer */ 406 spinlock_t ingress_lock; 407 struct Qdisc *qdisc_ingress; 408 409 /* 410 * One part is mostly used on xmit path (device) 411 */ 412 /* hard_start_xmit synchronizer */ 413 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 414 /* cpu id of processor entered to hard_start_xmit or -1, 415 if nobody entered there. 416 */ 417 int xmit_lock_owner; 418 void *priv; /* pointer to private data */ 419 int (*hard_start_xmit) (struct sk_buff *skb, 420 struct net_device *dev); 421 /* These may be needed for future network-power-down code. */ 422 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 423 424 int watchdog_timeo; /* used by dev_watchdog() */ 425 struct timer_list watchdog_timer; 426 427 /* 428 * refcnt is a very hot point, so align it on SMP 429 */ 430 /* Number of references to this device */ 431 atomic_t refcnt ____cacheline_aligned_in_smp; 432 433 /* delayed register/unregister */ 434 struct list_head todo_list; 435 /* device index hash chain */ 436 struct hlist_node index_hlist; 437 438 /* register/unregister state machine */ 439 enum { NETREG_UNINITIALIZED=0, 440 NETREG_REGISTERED, /* completed register_netdevice */ 441 NETREG_UNREGISTERING, /* called unregister_netdevice */ 442 NETREG_UNREGISTERED, /* completed unregister todo */ 443 NETREG_RELEASED, /* called free_netdev */ 444 } reg_state; 445 446 /* Called after device is detached from network. */ 447 void (*uninit)(struct net_device *dev); 448 /* Called after last user reference disappears. */ 449 void (*destructor)(struct net_device *dev); 450 451 /* Pointers to interface service routines. */ 452 int (*open)(struct net_device *dev); 453 int (*stop)(struct net_device *dev); 454 #define HAVE_NETDEV_POLL 455 int (*hard_header) (struct sk_buff *skb, 456 struct net_device *dev, 457 unsigned short type, 458 void *daddr, 459 void *saddr, 460 unsigned len); 461 int (*rebuild_header)(struct sk_buff *skb); 462 #define HAVE_MULTICAST 463 void (*set_multicast_list)(struct net_device *dev); 464 #define HAVE_SET_MAC_ADDR 465 int (*set_mac_address)(struct net_device *dev, 466 void *addr); 467 #define HAVE_PRIVATE_IOCTL 468 int (*do_ioctl)(struct net_device *dev, 469 struct ifreq *ifr, int cmd); 470 #define HAVE_SET_CONFIG 471 int (*set_config)(struct net_device *dev, 472 struct ifmap *map); 473 #define HAVE_HEADER_CACHE 474 int (*hard_header_cache)(struct neighbour *neigh, 475 struct hh_cache *hh); 476 void (*header_cache_update)(struct hh_cache *hh, 477 struct net_device *dev, 478 unsigned char * haddr); 479 #define HAVE_CHANGE_MTU 480 int (*change_mtu)(struct net_device *dev, int new_mtu); 481 482 #define HAVE_TX_TIMEOUT 483 void (*tx_timeout) (struct net_device *dev); 484 485 void (*vlan_rx_register)(struct net_device *dev, 486 struct vlan_group *grp); 487 void (*vlan_rx_add_vid)(struct net_device *dev, 488 unsigned short vid); 489 void (*vlan_rx_kill_vid)(struct net_device *dev, 490 unsigned short vid); 491 492 int (*hard_header_parse)(struct sk_buff *skb, 493 unsigned char *haddr); 494 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 495 #ifdef CONFIG_NETPOLL 496 struct netpoll_info *npinfo; 497 #endif 498 #ifdef CONFIG_NET_POLL_CONTROLLER 499 void (*poll_controller)(struct net_device *dev); 500 #endif 501 502 /* bridge stuff */ 503 struct net_bridge_port *br_port; 504 505 #ifdef CONFIG_NET_DIVERT 506 /* this will get initialized at each interface type init routine */ 507 struct divert_blk *divert; 508 #endif /* CONFIG_NET_DIVERT */ 509 510 /* class/net/name entry */ 511 struct class_device class_dev; 512 /* space for optional statistics and wireless sysfs groups */ 513 struct attribute_group *sysfs_groups[3]; 514 }; 515 516 #define NETDEV_ALIGN 32 517 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 518 519 static inline void *netdev_priv(struct net_device *dev) 520 { 521 return (char *)dev + ((sizeof(struct net_device) 522 + NETDEV_ALIGN_CONST) 523 & ~NETDEV_ALIGN_CONST); 524 } 525 526 #define SET_MODULE_OWNER(dev) do { } while (0) 527 /* Set the sysfs physical device reference for the network logical device 528 * if set prior to registration will cause a symlink during initialization. 529 */ 530 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev)) 531 532 struct packet_type { 533 __be16 type; /* This is really htons(ether_type). */ 534 struct net_device *dev; /* NULL is wildcarded here */ 535 int (*func) (struct sk_buff *, 536 struct net_device *, 537 struct packet_type *, 538 struct net_device *); 539 void *af_packet_priv; 540 struct list_head list; 541 }; 542 543 #include <linux/interrupt.h> 544 #include <linux/notifier.h> 545 546 extern struct net_device loopback_dev; /* The loopback */ 547 extern struct net_device *dev_base; /* All devices */ 548 extern rwlock_t dev_base_lock; /* Device list lock */ 549 550 extern int netdev_boot_setup_check(struct net_device *dev); 551 extern unsigned long netdev_boot_base(const char *prefix, int unit); 552 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 553 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 554 extern void dev_add_pack(struct packet_type *pt); 555 extern void dev_remove_pack(struct packet_type *pt); 556 extern void __dev_remove_pack(struct packet_type *pt); 557 558 extern struct net_device *dev_get_by_flags(unsigned short flags, 559 unsigned short mask); 560 extern struct net_device *dev_get_by_name(const char *name); 561 extern struct net_device *__dev_get_by_name(const char *name); 562 extern int dev_alloc_name(struct net_device *dev, const char *name); 563 extern int dev_open(struct net_device *dev); 564 extern int dev_close(struct net_device *dev); 565 extern int dev_queue_xmit(struct sk_buff *skb); 566 extern int register_netdevice(struct net_device *dev); 567 extern int unregister_netdevice(struct net_device *dev); 568 extern void free_netdev(struct net_device *dev); 569 extern void synchronize_net(void); 570 extern int register_netdevice_notifier(struct notifier_block *nb); 571 extern int unregister_netdevice_notifier(struct notifier_block *nb); 572 extern int call_netdevice_notifiers(unsigned long val, void *v); 573 extern struct net_device *dev_get_by_index(int ifindex); 574 extern struct net_device *__dev_get_by_index(int ifindex); 575 extern int dev_restart(struct net_device *dev); 576 #ifdef CONFIG_NETPOLL_TRAP 577 extern int netpoll_trap(void); 578 #endif 579 580 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 581 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 582 static inline int unregister_gifconf(unsigned int family) 583 { 584 return register_gifconf(family, NULL); 585 } 586 587 /* 588 * Incoming packets are placed on per-cpu queues so that 589 * no locking is needed. 590 */ 591 592 struct softnet_data 593 { 594 struct net_device *output_queue; 595 struct sk_buff_head input_pkt_queue; 596 struct list_head poll_list; 597 struct sk_buff *completion_queue; 598 599 struct net_device backlog_dev; /* Sorry. 8) */ 600 #ifdef CONFIG_NET_DMA 601 struct dma_chan *net_dma; 602 #endif 603 }; 604 605 DECLARE_PER_CPU(struct softnet_data,softnet_data); 606 607 #define HAVE_NETIF_QUEUE 608 609 extern void __netif_schedule(struct net_device *dev); 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 extern void dev_kfree_skb_any(struct sk_buff *skb); 674 675 #define HAVE_NETIF_RX 1 676 extern int netif_rx(struct sk_buff *skb); 677 extern int netif_rx_ni(struct sk_buff *skb); 678 #define HAVE_NETIF_RECEIVE_SKB 1 679 extern int netif_receive_skb(struct sk_buff *skb); 680 extern int dev_valid_name(const char *name); 681 extern int dev_ioctl(unsigned int cmd, void __user *); 682 extern int dev_ethtool(struct ifreq *); 683 extern unsigned dev_get_flags(const struct net_device *); 684 extern int dev_change_flags(struct net_device *, unsigned); 685 extern int dev_change_name(struct net_device *, char *); 686 extern int dev_set_mtu(struct net_device *, int); 687 extern int dev_set_mac_address(struct net_device *, 688 struct sockaddr *); 689 extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 690 691 extern void dev_init(void); 692 693 extern int netdev_nit; 694 extern int netdev_budget; 695 696 /* Called by rtnetlink.c:rtnl_unlock() */ 697 extern void netdev_run_todo(void); 698 699 static inline void dev_put(struct net_device *dev) 700 { 701 atomic_dec(&dev->refcnt); 702 } 703 704 static inline void dev_hold(struct net_device *dev) 705 { 706 atomic_inc(&dev->refcnt); 707 } 708 709 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 710 * and _off may be called from IRQ context, but it is caller 711 * who is responsible for serialization of these calls. 712 * 713 * The name carrier is inappropriate, these functions should really be 714 * called netif_lowerlayer_*() because they represent the state of any 715 * kind of lower layer not just hardware media. 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 static inline void netif_dormant_on(struct net_device *dev) 732 { 733 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 734 linkwatch_fire_event(dev); 735 } 736 737 static inline void netif_dormant_off(struct net_device *dev) 738 { 739 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 740 linkwatch_fire_event(dev); 741 } 742 743 static inline int netif_dormant(const struct net_device *dev) 744 { 745 return test_bit(__LINK_STATE_DORMANT, &dev->state); 746 } 747 748 749 static inline int netif_oper_up(const struct net_device *dev) { 750 return (dev->operstate == IF_OPER_UP || 751 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 752 } 753 754 /* Hot-plugging. */ 755 static inline int netif_device_present(struct net_device *dev) 756 { 757 return test_bit(__LINK_STATE_PRESENT, &dev->state); 758 } 759 760 extern void netif_device_detach(struct net_device *dev); 761 762 extern void netif_device_attach(struct net_device *dev); 763 764 /* 765 * Network interface message level settings 766 */ 767 #define HAVE_NETIF_MSG 1 768 769 enum { 770 NETIF_MSG_DRV = 0x0001, 771 NETIF_MSG_PROBE = 0x0002, 772 NETIF_MSG_LINK = 0x0004, 773 NETIF_MSG_TIMER = 0x0008, 774 NETIF_MSG_IFDOWN = 0x0010, 775 NETIF_MSG_IFUP = 0x0020, 776 NETIF_MSG_RX_ERR = 0x0040, 777 NETIF_MSG_TX_ERR = 0x0080, 778 NETIF_MSG_TX_QUEUED = 0x0100, 779 NETIF_MSG_INTR = 0x0200, 780 NETIF_MSG_TX_DONE = 0x0400, 781 NETIF_MSG_RX_STATUS = 0x0800, 782 NETIF_MSG_PKTDATA = 0x1000, 783 NETIF_MSG_HW = 0x2000, 784 NETIF_MSG_WOL = 0x4000, 785 }; 786 787 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 788 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 789 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 790 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 791 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 792 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 793 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 794 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 795 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 796 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 797 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 798 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 799 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 800 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 801 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 802 803 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 804 { 805 /* use default */ 806 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 807 return default_msg_enable_bits; 808 if (debug_value == 0) /* no output */ 809 return 0; 810 /* set low N bits */ 811 return (1 << debug_value) - 1; 812 } 813 814 /* Test if receive needs to be scheduled */ 815 static inline int __netif_rx_schedule_prep(struct net_device *dev) 816 { 817 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state); 818 } 819 820 /* Test if receive needs to be scheduled but only if up */ 821 static inline int netif_rx_schedule_prep(struct net_device *dev) 822 { 823 return netif_running(dev) && __netif_rx_schedule_prep(dev); 824 } 825 826 /* Add interface to tail of rx poll list. This assumes that _prep has 827 * already been called and returned 1. 828 */ 829 830 extern void __netif_rx_schedule(struct net_device *dev); 831 832 /* Try to reschedule poll. Called by irq handler. */ 833 834 static inline void netif_rx_schedule(struct net_device *dev) 835 { 836 if (netif_rx_schedule_prep(dev)) 837 __netif_rx_schedule(dev); 838 } 839 840 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 841 * Do not inline this? 842 */ 843 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 844 { 845 if (netif_rx_schedule_prep(dev)) { 846 unsigned long flags; 847 848 dev->quota += undo; 849 850 local_irq_save(flags); 851 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 852 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 853 local_irq_restore(flags); 854 return 1; 855 } 856 return 0; 857 } 858 859 /* Remove interface from poll list: it must be in the poll list 860 * on current cpu. This primitive is called by dev->poll(), when 861 * it completes the work. The device cannot be out of poll list at this 862 * moment, it is BUG(). 863 */ 864 static inline void netif_rx_complete(struct net_device *dev) 865 { 866 unsigned long flags; 867 868 local_irq_save(flags); 869 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 870 list_del(&dev->poll_list); 871 smp_mb__before_clear_bit(); 872 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 873 local_irq_restore(flags); 874 } 875 876 static inline void netif_poll_disable(struct net_device *dev) 877 { 878 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) 879 /* No hurry. */ 880 schedule_timeout_interruptible(1); 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_lock(struct net_device *dev) 900 { 901 spin_lock(&dev->_xmit_lock); 902 dev->xmit_lock_owner = smp_processor_id(); 903 } 904 905 static inline void netif_tx_lock_bh(struct net_device *dev) 906 { 907 spin_lock_bh(&dev->_xmit_lock); 908 dev->xmit_lock_owner = smp_processor_id(); 909 } 910 911 static inline int netif_tx_trylock(struct net_device *dev) 912 { 913 int err = spin_trylock(&dev->_xmit_lock); 914 if (!err) 915 dev->xmit_lock_owner = smp_processor_id(); 916 return err; 917 } 918 919 static inline void netif_tx_unlock(struct net_device *dev) 920 { 921 dev->xmit_lock_owner = -1; 922 spin_unlock(&dev->_xmit_lock); 923 } 924 925 static inline void netif_tx_unlock_bh(struct net_device *dev) 926 { 927 dev->xmit_lock_owner = -1; 928 spin_unlock_bh(&dev->_xmit_lock); 929 } 930 931 static inline void netif_tx_disable(struct net_device *dev) 932 { 933 netif_tx_lock_bh(dev); 934 netif_stop_queue(dev); 935 netif_tx_unlock_bh(dev); 936 } 937 938 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 939 940 extern void ether_setup(struct net_device *dev); 941 942 /* Support for loadable net-drivers */ 943 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name, 944 void (*setup)(struct net_device *)); 945 extern int register_netdev(struct net_device *dev); 946 extern void unregister_netdev(struct net_device *dev); 947 /* Functions used for multicast support */ 948 extern void dev_mc_upload(struct net_device *dev); 949 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 950 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 951 extern void dev_mc_discard(struct net_device *dev); 952 extern void dev_set_promiscuity(struct net_device *dev, int inc); 953 extern void dev_set_allmulti(struct net_device *dev, int inc); 954 extern void netdev_state_change(struct net_device *dev); 955 extern void netdev_features_change(struct net_device *dev); 956 /* Load a device via the kmod */ 957 extern void dev_load(const char *name); 958 extern void dev_mcast_init(void); 959 extern int netdev_max_backlog; 960 extern int weight_p; 961 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 962 extern int skb_checksum_help(struct sk_buff *skb, int inward); 963 #ifdef CONFIG_BUG 964 extern void netdev_rx_csum_fault(struct net_device *dev); 965 #else 966 static inline void netdev_rx_csum_fault(struct net_device *dev) 967 { 968 } 969 #endif 970 /* rx skb timestamps */ 971 extern void net_enable_timestamp(void); 972 extern void net_disable_timestamp(void); 973 974 #ifdef CONFIG_PROC_FS 975 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 976 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 977 extern void dev_seq_stop(struct seq_file *seq, void *v); 978 #endif 979 980 extern void linkwatch_run_queue(void); 981 982 #endif /* __KERNEL__ */ 983 984 #endif /* _LINUX_DEV_H */ 985