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 <linux/timer.h> 34 #include <asm/atomic.h> 35 #include <asm/cache.h> 36 #include <asm/byteorder.h> 37 38 #include <linux/device.h> 39 #include <linux/percpu.h> 40 #include <linux/dmaengine.h> 41 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 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 71 * indicates that the device will soon be dropping packets, or already drops 72 * some packets of the same priority; prompting us to send less aggressively. */ 73 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e)) 74 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 75 76 #endif 77 78 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 79 80 /* Driver transmit return codes */ 81 #define NETDEV_TX_OK 0 /* driver took care of packet */ 82 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ 83 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ 84 85 /* 86 * Compute the worst case header length according to the protocols 87 * used. 88 */ 89 90 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR) 91 #define LL_MAX_HEADER 32 92 #else 93 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 94 #define LL_MAX_HEADER 96 95 #else 96 #define LL_MAX_HEADER 48 97 #endif 98 #endif 99 100 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 101 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 102 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 103 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 104 #define MAX_HEADER LL_MAX_HEADER 105 #else 106 #define MAX_HEADER (LL_MAX_HEADER + 48) 107 #endif 108 109 /* 110 * Network device statistics. Akin to the 2.0 ether stats but 111 * with byte counters. 112 */ 113 114 struct net_device_stats 115 { 116 unsigned long rx_packets; /* total packets received */ 117 unsigned long tx_packets; /* total packets transmitted */ 118 unsigned long rx_bytes; /* total bytes received */ 119 unsigned long tx_bytes; /* total bytes transmitted */ 120 unsigned long rx_errors; /* bad packets received */ 121 unsigned long tx_errors; /* packet transmit problems */ 122 unsigned long rx_dropped; /* no space in linux buffers */ 123 unsigned long tx_dropped; /* no space available in linux */ 124 unsigned long multicast; /* multicast packets received */ 125 unsigned long collisions; 126 127 /* detailed rx_errors: */ 128 unsigned long rx_length_errors; 129 unsigned long rx_over_errors; /* receiver ring buff overflow */ 130 unsigned long rx_crc_errors; /* recved pkt with crc error */ 131 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 132 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 133 unsigned long rx_missed_errors; /* receiver missed packet */ 134 135 /* detailed tx_errors */ 136 unsigned long tx_aborted_errors; 137 unsigned long tx_carrier_errors; 138 unsigned long tx_fifo_errors; 139 unsigned long tx_heartbeat_errors; 140 unsigned long tx_window_errors; 141 142 /* for cslip etc */ 143 unsigned long rx_compressed; 144 unsigned long tx_compressed; 145 }; 146 147 148 /* Media selection options. */ 149 enum { 150 IF_PORT_UNKNOWN = 0, 151 IF_PORT_10BASE2, 152 IF_PORT_10BASET, 153 IF_PORT_AUI, 154 IF_PORT_100BASET, 155 IF_PORT_100BASETX, 156 IF_PORT_100BASEFX 157 }; 158 159 #ifdef __KERNEL__ 160 161 #include <linux/cache.h> 162 #include <linux/skbuff.h> 163 164 struct neighbour; 165 struct neigh_parms; 166 struct sk_buff; 167 168 struct netif_rx_stats 169 { 170 unsigned total; 171 unsigned dropped; 172 unsigned time_squeeze; 173 unsigned cpu_collision; 174 }; 175 176 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 177 178 179 /* 180 * We tag multicasts with these structures. 181 */ 182 183 struct dev_mc_list 184 { 185 struct dev_mc_list *next; 186 __u8 dmi_addr[MAX_ADDR_LEN]; 187 unsigned char dmi_addrlen; 188 int dmi_users; 189 int dmi_gusers; 190 }; 191 192 struct hh_cache 193 { 194 struct hh_cache *hh_next; /* Next entry */ 195 atomic_t hh_refcnt; /* number of users */ 196 /* 197 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 198 * cache line on SMP. 199 * They are mostly read, but hh_refcnt may be changed quite frequently, 200 * incurring cache line ping pongs. 201 */ 202 __be16 hh_type ____cacheline_aligned_in_smp; 203 /* protocol identifier, f.e ETH_P_IP 204 * NOTE: For VLANs, this will be the 205 * encapuslated type. --BLG 206 */ 207 u16 hh_len; /* length of header */ 208 int (*hh_output)(struct sk_buff *skb); 209 seqlock_t hh_lock; 210 211 /* cached hardware header; allow for machine alignment needs. */ 212 #define HH_DATA_MOD 16 213 #define HH_DATA_OFF(__len) \ 214 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 215 #define HH_DATA_ALIGN(__len) \ 216 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 217 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 218 }; 219 220 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 221 * Alternative is: 222 * dev->hard_header_len ? (dev->hard_header_len + 223 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 224 * 225 * We could use other alignment values, but we must maintain the 226 * relationship HH alignment <= LL alignment. 227 */ 228 #define LL_RESERVED_SPACE(dev) \ 229 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 230 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 231 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 232 233 /* These flag bits are private to the generic network queueing 234 * layer, they may not be explicitly referenced by any other 235 * code. 236 */ 237 238 enum netdev_state_t 239 { 240 __LINK_STATE_XOFF=0, 241 __LINK_STATE_START, 242 __LINK_STATE_PRESENT, 243 __LINK_STATE_SCHED, 244 __LINK_STATE_NOCARRIER, 245 __LINK_STATE_RX_SCHED, 246 __LINK_STATE_LINKWATCH_PENDING, 247 __LINK_STATE_DORMANT, 248 __LINK_STATE_QDISC_RUNNING, 249 }; 250 251 252 /* 253 * This structure holds at boot time configured netdevice settings. They 254 * are then used in the device probing. 255 */ 256 struct netdev_boot_setup { 257 char name[IFNAMSIZ]; 258 struct ifmap map; 259 }; 260 #define NETDEV_BOOT_SETUP_MAX 8 261 262 extern int __init netdev_boot_setup(char *str); 263 264 /* 265 * The DEVICE structure. 266 * Actually, this whole structure is a big mistake. It mixes I/O 267 * data with strictly "high-level" data, and it has to know about 268 * almost every data structure used in the INET module. 269 * 270 * FIXME: cleanup struct net_device such that network protocol info 271 * moves out. 272 */ 273 274 struct net_device 275 { 276 277 /* 278 * This is the first field of the "visible" part of this structure 279 * (i.e. as seen by users in the "Space.c" file). It is the name 280 * the interface. 281 */ 282 char name[IFNAMSIZ]; 283 /* device name hash chain */ 284 struct hlist_node name_hlist; 285 286 /* 287 * I/O specific fields 288 * FIXME: Merge these and struct ifmap into one 289 */ 290 unsigned long mem_end; /* shared mem end */ 291 unsigned long mem_start; /* shared mem start */ 292 unsigned long base_addr; /* device I/O address */ 293 unsigned int irq; /* device IRQ number */ 294 295 /* 296 * Some hardware also needs these fields, but they are not 297 * part of the usual set specified in Space.c. 298 */ 299 300 unsigned char if_port; /* Selectable AUI, TP,..*/ 301 unsigned char dma; /* DMA channel */ 302 303 unsigned long state; 304 305 struct net_device *next; 306 307 /* The device initialization function. Called only once. */ 308 int (*init)(struct net_device *dev); 309 310 /* ------- Fields preinitialized in Space.c finish here ------- */ 311 312 /* Net device features */ 313 unsigned long features; 314 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 315 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */ 316 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 317 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 318 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 319 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 320 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 321 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 322 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 323 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 324 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 325 #define NETIF_F_LLTX 4096 /* LockLess TX */ 326 327 /* Segmentation offload features */ 328 #define NETIF_F_GSO_SHIFT 16 329 #define NETIF_F_GSO_MASK 0xffff0000 330 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 331 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 332 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 333 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 334 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 335 336 /* List of features with software fallbacks. */ 337 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 338 339 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 340 #define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM) 341 342 struct net_device *next_sched; 343 344 /* Interface index. Unique device identifier */ 345 int ifindex; 346 int iflink; 347 348 349 struct net_device_stats* (*get_stats)(struct net_device *dev); 350 351 /* List of functions to handle Wireless Extensions (instead of ioctl). 352 * See <net/iw_handler.h> for details. Jean II */ 353 const struct iw_handler_def * wireless_handlers; 354 /* Instance data managed by the core of Wireless Extensions. */ 355 struct iw_public_data * wireless_data; 356 357 const struct ethtool_ops *ethtool_ops; 358 359 /* 360 * This marks the end of the "visible" part of the structure. All 361 * fields hereafter are internal to the system, and may change at 362 * will (read: may be cleaned up at will). 363 */ 364 365 366 unsigned int flags; /* interface flags (a la BSD) */ 367 unsigned short gflags; 368 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 369 unsigned short padded; /* How much padding added by alloc_netdev() */ 370 371 unsigned char operstate; /* RFC2863 operstate */ 372 unsigned char link_mode; /* mapping policy to operstate */ 373 374 unsigned mtu; /* interface MTU value */ 375 unsigned short type; /* interface hardware type */ 376 unsigned short hard_header_len; /* hardware hdr length */ 377 378 struct net_device *master; /* Pointer to master device of a group, 379 * which this device is member of. 380 */ 381 382 /* Interface address info. */ 383 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 384 unsigned char addr_len; /* hardware address length */ 385 unsigned short dev_id; /* for shared network cards */ 386 387 struct dev_mc_list *mc_list; /* Multicast mac addresses */ 388 int mc_count; /* Number of installed mcasts */ 389 int promiscuity; 390 int allmulti; 391 392 393 /* Protocol specific pointers */ 394 395 void *atalk_ptr; /* AppleTalk link */ 396 void *ip_ptr; /* IPv4 specific data */ 397 void *dn_ptr; /* DECnet specific data */ 398 void *ip6_ptr; /* IPv6 specific data */ 399 void *ec_ptr; /* Econet specific data */ 400 void *ax25_ptr; /* AX.25 specific data */ 401 402 /* 403 * Cache line mostly used on receive path (including eth_type_trans()) 404 */ 405 struct list_head poll_list ____cacheline_aligned_in_smp; 406 /* Link to poll list */ 407 408 int (*poll) (struct net_device *dev, int *quota); 409 int quota; 410 int weight; 411 unsigned long last_rx; /* Time of last Rx */ 412 /* Interface address info used in eth_type_trans() */ 413 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 414 because most packets are unicast) */ 415 416 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 417 418 /* 419 * Cache line mostly used on queue transmit path (qdisc) 420 */ 421 /* device queue lock */ 422 spinlock_t queue_lock ____cacheline_aligned_in_smp; 423 struct Qdisc *qdisc; 424 struct Qdisc *qdisc_sleeping; 425 struct list_head qdisc_list; 426 unsigned long tx_queue_len; /* Max frames per queue allowed */ 427 428 /* Partially transmitted GSO packet. */ 429 struct sk_buff *gso_skb; 430 431 /* ingress path synchronizer */ 432 spinlock_t ingress_lock; 433 struct Qdisc *qdisc_ingress; 434 435 /* 436 * One part is mostly used on xmit path (device) 437 */ 438 /* hard_start_xmit synchronizer */ 439 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 440 /* cpu id of processor entered to hard_start_xmit or -1, 441 if nobody entered there. 442 */ 443 int xmit_lock_owner; 444 void *priv; /* pointer to private data */ 445 int (*hard_start_xmit) (struct sk_buff *skb, 446 struct net_device *dev); 447 /* These may be needed for future network-power-down code. */ 448 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 449 450 int watchdog_timeo; /* used by dev_watchdog() */ 451 struct timer_list watchdog_timer; 452 453 /* 454 * refcnt is a very hot point, so align it on SMP 455 */ 456 /* Number of references to this device */ 457 atomic_t refcnt ____cacheline_aligned_in_smp; 458 459 /* delayed register/unregister */ 460 struct list_head todo_list; 461 /* device index hash chain */ 462 struct hlist_node index_hlist; 463 464 /* register/unregister state machine */ 465 enum { NETREG_UNINITIALIZED=0, 466 NETREG_REGISTERED, /* completed register_netdevice */ 467 NETREG_UNREGISTERING, /* called unregister_netdevice */ 468 NETREG_UNREGISTERED, /* completed unregister todo */ 469 NETREG_RELEASED, /* called free_netdev */ 470 } reg_state; 471 472 /* Called after device is detached from network. */ 473 void (*uninit)(struct net_device *dev); 474 /* Called after last user reference disappears. */ 475 void (*destructor)(struct net_device *dev); 476 477 /* Pointers to interface service routines. */ 478 int (*open)(struct net_device *dev); 479 int (*stop)(struct net_device *dev); 480 #define HAVE_NETDEV_POLL 481 int (*hard_header) (struct sk_buff *skb, 482 struct net_device *dev, 483 unsigned short type, 484 void *daddr, 485 void *saddr, 486 unsigned len); 487 int (*rebuild_header)(struct sk_buff *skb); 488 #define HAVE_MULTICAST 489 void (*set_multicast_list)(struct net_device *dev); 490 #define HAVE_SET_MAC_ADDR 491 int (*set_mac_address)(struct net_device *dev, 492 void *addr); 493 #define HAVE_PRIVATE_IOCTL 494 int (*do_ioctl)(struct net_device *dev, 495 struct ifreq *ifr, int cmd); 496 #define HAVE_SET_CONFIG 497 int (*set_config)(struct net_device *dev, 498 struct ifmap *map); 499 #define HAVE_HEADER_CACHE 500 int (*hard_header_cache)(struct neighbour *neigh, 501 struct hh_cache *hh); 502 void (*header_cache_update)(struct hh_cache *hh, 503 struct net_device *dev, 504 unsigned char * haddr); 505 #define HAVE_CHANGE_MTU 506 int (*change_mtu)(struct net_device *dev, int new_mtu); 507 508 #define HAVE_TX_TIMEOUT 509 void (*tx_timeout) (struct net_device *dev); 510 511 void (*vlan_rx_register)(struct net_device *dev, 512 struct vlan_group *grp); 513 void (*vlan_rx_add_vid)(struct net_device *dev, 514 unsigned short vid); 515 void (*vlan_rx_kill_vid)(struct net_device *dev, 516 unsigned short vid); 517 518 int (*hard_header_parse)(struct sk_buff *skb, 519 unsigned char *haddr); 520 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 521 #ifdef CONFIG_NETPOLL 522 struct netpoll_info *npinfo; 523 #endif 524 #ifdef CONFIG_NET_POLL_CONTROLLER 525 void (*poll_controller)(struct net_device *dev); 526 #endif 527 528 /* bridge stuff */ 529 struct net_bridge_port *br_port; 530 531 /* class/net/name entry */ 532 struct class_device class_dev; 533 /* space for optional statistics and wireless sysfs groups */ 534 struct attribute_group *sysfs_groups[3]; 535 }; 536 537 #define NETDEV_ALIGN 32 538 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 539 540 static inline void *netdev_priv(struct net_device *dev) 541 { 542 return (char *)dev + ((sizeof(struct net_device) 543 + NETDEV_ALIGN_CONST) 544 & ~NETDEV_ALIGN_CONST); 545 } 546 547 #define SET_MODULE_OWNER(dev) do { } while (0) 548 /* Set the sysfs physical device reference for the network logical device 549 * if set prior to registration will cause a symlink during initialization. 550 */ 551 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev)) 552 553 struct packet_type { 554 __be16 type; /* This is really htons(ether_type). */ 555 struct net_device *dev; /* NULL is wildcarded here */ 556 int (*func) (struct sk_buff *, 557 struct net_device *, 558 struct packet_type *, 559 struct net_device *); 560 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 561 int features); 562 int (*gso_send_check)(struct sk_buff *skb); 563 void *af_packet_priv; 564 struct list_head list; 565 }; 566 567 #include <linux/interrupt.h> 568 #include <linux/notifier.h> 569 570 extern struct net_device loopback_dev; /* The loopback */ 571 extern struct net_device *dev_base; /* All devices */ 572 extern rwlock_t dev_base_lock; /* Device list lock */ 573 574 extern int netdev_boot_setup_check(struct net_device *dev); 575 extern unsigned long netdev_boot_base(const char *prefix, int unit); 576 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 577 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 578 extern void dev_add_pack(struct packet_type *pt); 579 extern void dev_remove_pack(struct packet_type *pt); 580 extern void __dev_remove_pack(struct packet_type *pt); 581 582 extern struct net_device *dev_get_by_flags(unsigned short flags, 583 unsigned short mask); 584 extern struct net_device *dev_get_by_name(const char *name); 585 extern struct net_device *__dev_get_by_name(const char *name); 586 extern int dev_alloc_name(struct net_device *dev, const char *name); 587 extern int dev_open(struct net_device *dev); 588 extern int dev_close(struct net_device *dev); 589 extern int dev_queue_xmit(struct sk_buff *skb); 590 extern int register_netdevice(struct net_device *dev); 591 extern int unregister_netdevice(struct net_device *dev); 592 extern void free_netdev(struct net_device *dev); 593 extern void synchronize_net(void); 594 extern int register_netdevice_notifier(struct notifier_block *nb); 595 extern int unregister_netdevice_notifier(struct notifier_block *nb); 596 extern int call_netdevice_notifiers(unsigned long val, void *v); 597 extern struct net_device *dev_get_by_index(int ifindex); 598 extern struct net_device *__dev_get_by_index(int ifindex); 599 extern int dev_restart(struct net_device *dev); 600 #ifdef CONFIG_NETPOLL_TRAP 601 extern int netpoll_trap(void); 602 #endif 603 604 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 605 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 606 static inline int unregister_gifconf(unsigned int family) 607 { 608 return register_gifconf(family, NULL); 609 } 610 611 /* 612 * Incoming packets are placed on per-cpu queues so that 613 * no locking is needed. 614 */ 615 616 struct softnet_data 617 { 618 struct net_device *output_queue; 619 struct sk_buff_head input_pkt_queue; 620 struct list_head poll_list; 621 struct sk_buff *completion_queue; 622 623 struct net_device backlog_dev; /* Sorry. 8) */ 624 #ifdef CONFIG_NET_DMA 625 struct dma_chan *net_dma; 626 #endif 627 }; 628 629 DECLARE_PER_CPU(struct softnet_data,softnet_data); 630 631 #define HAVE_NETIF_QUEUE 632 633 extern void __netif_schedule(struct net_device *dev); 634 635 static inline void netif_schedule(struct net_device *dev) 636 { 637 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 638 __netif_schedule(dev); 639 } 640 641 static inline void netif_start_queue(struct net_device *dev) 642 { 643 clear_bit(__LINK_STATE_XOFF, &dev->state); 644 } 645 646 static inline void netif_wake_queue(struct net_device *dev) 647 { 648 #ifdef CONFIG_NETPOLL_TRAP 649 if (netpoll_trap()) 650 return; 651 #endif 652 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 653 __netif_schedule(dev); 654 } 655 656 static inline void netif_stop_queue(struct net_device *dev) 657 { 658 #ifdef CONFIG_NETPOLL_TRAP 659 if (netpoll_trap()) 660 return; 661 #endif 662 set_bit(__LINK_STATE_XOFF, &dev->state); 663 } 664 665 static inline int netif_queue_stopped(const struct net_device *dev) 666 { 667 return test_bit(__LINK_STATE_XOFF, &dev->state); 668 } 669 670 static inline int netif_running(const struct net_device *dev) 671 { 672 return test_bit(__LINK_STATE_START, &dev->state); 673 } 674 675 676 /* Use this variant when it is known for sure that it 677 * is executing from interrupt context. 678 */ 679 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 680 { 681 if (atomic_dec_and_test(&skb->users)) { 682 struct softnet_data *sd; 683 unsigned long flags; 684 685 local_irq_save(flags); 686 sd = &__get_cpu_var(softnet_data); 687 skb->next = sd->completion_queue; 688 sd->completion_queue = skb; 689 raise_softirq_irqoff(NET_TX_SOFTIRQ); 690 local_irq_restore(flags); 691 } 692 } 693 694 /* Use this variant in places where it could be invoked 695 * either from interrupt or non-interrupt context. 696 */ 697 extern void dev_kfree_skb_any(struct sk_buff *skb); 698 699 #define HAVE_NETIF_RX 1 700 extern int netif_rx(struct sk_buff *skb); 701 extern int netif_rx_ni(struct sk_buff *skb); 702 #define HAVE_NETIF_RECEIVE_SKB 1 703 extern int netif_receive_skb(struct sk_buff *skb); 704 extern int dev_valid_name(const char *name); 705 extern int dev_ioctl(unsigned int cmd, void __user *); 706 extern int dev_ethtool(struct ifreq *); 707 extern unsigned dev_get_flags(const struct net_device *); 708 extern int dev_change_flags(struct net_device *, unsigned); 709 extern int dev_change_name(struct net_device *, char *); 710 extern int dev_set_mtu(struct net_device *, int); 711 extern int dev_set_mac_address(struct net_device *, 712 struct sockaddr *); 713 extern int dev_hard_start_xmit(struct sk_buff *skb, 714 struct net_device *dev); 715 716 extern void dev_init(void); 717 718 extern int netdev_budget; 719 720 /* Called by rtnetlink.c:rtnl_unlock() */ 721 extern void netdev_run_todo(void); 722 723 static inline void dev_put(struct net_device *dev) 724 { 725 atomic_dec(&dev->refcnt); 726 } 727 728 static inline void dev_hold(struct net_device *dev) 729 { 730 atomic_inc(&dev->refcnt); 731 } 732 733 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 734 * and _off may be called from IRQ context, but it is caller 735 * who is responsible for serialization of these calls. 736 * 737 * The name carrier is inappropriate, these functions should really be 738 * called netif_lowerlayer_*() because they represent the state of any 739 * kind of lower layer not just hardware media. 740 */ 741 742 extern void linkwatch_fire_event(struct net_device *dev); 743 744 static inline int netif_carrier_ok(const struct net_device *dev) 745 { 746 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 747 } 748 749 extern void __netdev_watchdog_up(struct net_device *dev); 750 751 extern void netif_carrier_on(struct net_device *dev); 752 753 extern void netif_carrier_off(struct net_device *dev); 754 755 static inline void netif_dormant_on(struct net_device *dev) 756 { 757 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 758 linkwatch_fire_event(dev); 759 } 760 761 static inline void netif_dormant_off(struct net_device *dev) 762 { 763 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 764 linkwatch_fire_event(dev); 765 } 766 767 static inline int netif_dormant(const struct net_device *dev) 768 { 769 return test_bit(__LINK_STATE_DORMANT, &dev->state); 770 } 771 772 773 static inline int netif_oper_up(const struct net_device *dev) { 774 return (dev->operstate == IF_OPER_UP || 775 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 776 } 777 778 /* Hot-plugging. */ 779 static inline int netif_device_present(struct net_device *dev) 780 { 781 return test_bit(__LINK_STATE_PRESENT, &dev->state); 782 } 783 784 extern void netif_device_detach(struct net_device *dev); 785 786 extern void netif_device_attach(struct net_device *dev); 787 788 /* 789 * Network interface message level settings 790 */ 791 #define HAVE_NETIF_MSG 1 792 793 enum { 794 NETIF_MSG_DRV = 0x0001, 795 NETIF_MSG_PROBE = 0x0002, 796 NETIF_MSG_LINK = 0x0004, 797 NETIF_MSG_TIMER = 0x0008, 798 NETIF_MSG_IFDOWN = 0x0010, 799 NETIF_MSG_IFUP = 0x0020, 800 NETIF_MSG_RX_ERR = 0x0040, 801 NETIF_MSG_TX_ERR = 0x0080, 802 NETIF_MSG_TX_QUEUED = 0x0100, 803 NETIF_MSG_INTR = 0x0200, 804 NETIF_MSG_TX_DONE = 0x0400, 805 NETIF_MSG_RX_STATUS = 0x0800, 806 NETIF_MSG_PKTDATA = 0x1000, 807 NETIF_MSG_HW = 0x2000, 808 NETIF_MSG_WOL = 0x4000, 809 }; 810 811 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 812 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 813 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 814 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 815 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 816 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 817 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 818 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 819 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 820 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 821 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 822 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 823 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 824 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 825 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 826 827 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 828 { 829 /* use default */ 830 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 831 return default_msg_enable_bits; 832 if (debug_value == 0) /* no output */ 833 return 0; 834 /* set low N bits */ 835 return (1 << debug_value) - 1; 836 } 837 838 /* Test if receive needs to be scheduled */ 839 static inline int __netif_rx_schedule_prep(struct net_device *dev) 840 { 841 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state); 842 } 843 844 /* Test if receive needs to be scheduled but only if up */ 845 static inline int netif_rx_schedule_prep(struct net_device *dev) 846 { 847 return netif_running(dev) && __netif_rx_schedule_prep(dev); 848 } 849 850 /* Add interface to tail of rx poll list. This assumes that _prep has 851 * already been called and returned 1. 852 */ 853 854 extern void __netif_rx_schedule(struct net_device *dev); 855 856 /* Try to reschedule poll. Called by irq handler. */ 857 858 static inline void netif_rx_schedule(struct net_device *dev) 859 { 860 if (netif_rx_schedule_prep(dev)) 861 __netif_rx_schedule(dev); 862 } 863 864 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 865 * Do not inline this? 866 */ 867 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 868 { 869 if (netif_rx_schedule_prep(dev)) { 870 unsigned long flags; 871 872 dev->quota += undo; 873 874 local_irq_save(flags); 875 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 876 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 877 local_irq_restore(flags); 878 return 1; 879 } 880 return 0; 881 } 882 883 /* Remove interface from poll list: it must be in the poll list 884 * on current cpu. This primitive is called by dev->poll(), when 885 * it completes the work. The device cannot be out of poll list at this 886 * moment, it is BUG(). 887 */ 888 static inline void netif_rx_complete(struct net_device *dev) 889 { 890 unsigned long flags; 891 892 local_irq_save(flags); 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 local_irq_restore(flags); 898 } 899 900 static inline void netif_poll_disable(struct net_device *dev) 901 { 902 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) 903 /* No hurry. */ 904 schedule_timeout_interruptible(1); 905 } 906 907 static inline void netif_poll_enable(struct net_device *dev) 908 { 909 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 910 } 911 912 /* same as netif_rx_complete, except that local_irq_save(flags) 913 * has already been issued 914 */ 915 static inline void __netif_rx_complete(struct net_device *dev) 916 { 917 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 918 list_del(&dev->poll_list); 919 smp_mb__before_clear_bit(); 920 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 921 } 922 923 static inline void netif_tx_lock(struct net_device *dev) 924 { 925 spin_lock(&dev->_xmit_lock); 926 dev->xmit_lock_owner = smp_processor_id(); 927 } 928 929 static inline void netif_tx_lock_bh(struct net_device *dev) 930 { 931 spin_lock_bh(&dev->_xmit_lock); 932 dev->xmit_lock_owner = smp_processor_id(); 933 } 934 935 static inline int netif_tx_trylock(struct net_device *dev) 936 { 937 int ok = spin_trylock(&dev->_xmit_lock); 938 if (likely(ok)) 939 dev->xmit_lock_owner = smp_processor_id(); 940 return ok; 941 } 942 943 static inline void netif_tx_unlock(struct net_device *dev) 944 { 945 dev->xmit_lock_owner = -1; 946 spin_unlock(&dev->_xmit_lock); 947 } 948 949 static inline void netif_tx_unlock_bh(struct net_device *dev) 950 { 951 dev->xmit_lock_owner = -1; 952 spin_unlock_bh(&dev->_xmit_lock); 953 } 954 955 static inline void netif_tx_disable(struct net_device *dev) 956 { 957 netif_tx_lock_bh(dev); 958 netif_stop_queue(dev); 959 netif_tx_unlock_bh(dev); 960 } 961 962 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 963 964 extern void ether_setup(struct net_device *dev); 965 966 /* Support for loadable net-drivers */ 967 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name, 968 void (*setup)(struct net_device *)); 969 extern int register_netdev(struct net_device *dev); 970 extern void unregister_netdev(struct net_device *dev); 971 /* Functions used for multicast support */ 972 extern void dev_mc_upload(struct net_device *dev); 973 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 974 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 975 extern void dev_mc_discard(struct net_device *dev); 976 extern void dev_set_promiscuity(struct net_device *dev, int inc); 977 extern void dev_set_allmulti(struct net_device *dev, int inc); 978 extern void netdev_state_change(struct net_device *dev); 979 extern void netdev_features_change(struct net_device *dev); 980 /* Load a device via the kmod */ 981 extern void dev_load(const char *name); 982 extern void dev_mcast_init(void); 983 extern int netdev_max_backlog; 984 extern int weight_p; 985 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 986 extern int skb_checksum_help(struct sk_buff *skb); 987 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 988 #ifdef CONFIG_BUG 989 extern void netdev_rx_csum_fault(struct net_device *dev); 990 #else 991 static inline void netdev_rx_csum_fault(struct net_device *dev) 992 { 993 } 994 #endif 995 /* rx skb timestamps */ 996 extern void net_enable_timestamp(void); 997 extern void net_disable_timestamp(void); 998 999 #ifdef CONFIG_PROC_FS 1000 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1001 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1002 extern void dev_seq_stop(struct seq_file *seq, void *v); 1003 #endif 1004 1005 extern void linkwatch_run_queue(void); 1006 1007 static inline int net_gso_ok(int features, int gso_type) 1008 { 1009 int feature = gso_type << NETIF_F_GSO_SHIFT; 1010 return (features & feature) == feature; 1011 } 1012 1013 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1014 { 1015 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1016 } 1017 1018 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1019 { 1020 return skb_is_gso(skb) && 1021 (!skb_gso_ok(skb, dev->features) || 1022 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1023 } 1024 1025 /* On bonding slaves other than the currently active slave, suppress 1026 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1027 * ARP on active-backup slaves with arp_validate enabled. 1028 */ 1029 static inline int skb_bond_should_drop(struct sk_buff *skb) 1030 { 1031 struct net_device *dev = skb->dev; 1032 struct net_device *master = dev->master; 1033 1034 if (master && 1035 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1036 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1037 skb->protocol == __constant_htons(ETH_P_ARP)) 1038 return 0; 1039 1040 if (master->priv_flags & IFF_MASTER_ALB) { 1041 if (skb->pkt_type != PACKET_BROADCAST && 1042 skb->pkt_type != PACKET_MULTICAST) 1043 return 0; 1044 } 1045 if (master->priv_flags & IFF_MASTER_8023AD && 1046 skb->protocol == __constant_htons(ETH_P_SLOW)) 1047 return 0; 1048 1049 return 1; 1050 } 1051 return 0; 1052 } 1053 1054 #endif /* __KERNEL__ */ 1055 1056 #endif /* _LINUX_DEV_H */ 1057