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, <waltje (at) uWalt.NL.Mugnet.ORG> 12 * Corey Minyard <wf-rch!minyard (at) relay.EU.net> 13 * Donald J. Becker, <becker (at) cesdis.gsfc.nasa.gov> 14 * Alan Cox, <Alan.Cox (at) linux.org> 15 * Bjorn Ekwall. <bj0rn (at) blox.se> 16 * Pekka Riikonen <priikone (at) poseidon.pspt.fi> 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_GSO 2048 /* Enable software GSO. */ 312 #define NETIF_F_LLTX 4096 /* LockLess TX */ 313 314 /* Segmentation offload features */ 315 #define NETIF_F_GSO_SHIFT 16 316 #define NETIF_F_GSO_MASK 0xffff0000 317 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 318 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 319 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 320 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 321 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 322 323 /* List of features with software fallbacks. */ 324 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 325 326 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 327 #define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM) 328 329 struct net_device *next_sched; 330 331 /* Interface index. Unique device identifier */ 332 int ifindex; 333 int iflink; 334 335 336 struct net_device_stats* (*get_stats)(struct net_device *dev); 337 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev); 338 339 /* List of functions to handle Wireless Extensions (instead of ioctl). 340 * See <net/iw_handler.h> for details. Jean II */ 341 const struct iw_handler_def * wireless_handlers; 342 /* Instance data managed by the core of Wireless Extensions. */ 343 struct iw_public_data * wireless_data; 344 345 struct ethtool_ops *ethtool_ops; 346 347 /* 348 * This marks the end of the "visible" part of the structure. All 349 * fields hereafter are internal to the system, and may change at 350 * will (read: may be cleaned up at will). 351 */ 352 353 354 unsigned int flags; /* interface flags (a la BSD) */ 355 unsigned short gflags; 356 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 357 unsigned short padded; /* How much padding added by alloc_netdev() */ 358 359 unsigned char operstate; /* RFC2863 operstate */ 360 unsigned char link_mode; /* mapping policy to operstate */ 361 362 unsigned mtu; /* interface MTU value */ 363 unsigned short type; /* interface hardware type */ 364 unsigned short hard_header_len; /* hardware hdr length */ 365 366 struct net_device *master; /* Pointer to master device of a group, 367 * which this device is member of. 368 */ 369 370 /* Interface address info. */ 371 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 372 unsigned char addr_len; /* hardware address length */ 373 unsigned short dev_id; /* for shared network cards */ 374 375 struct dev_mc_list *mc_list; /* Multicast mac addresses */ 376 int mc_count; /* Number of installed mcasts */ 377 int promiscuity; 378 int allmulti; 379 380 381 /* Protocol specific pointers */ 382 383 void *atalk_ptr; /* AppleTalk link */ 384 void *ip_ptr; /* IPv4 specific data */ 385 void *dn_ptr; /* DECnet specific data */ 386 void *ip6_ptr; /* IPv6 specific data */ 387 void *ec_ptr; /* Econet specific data */ 388 void *ax25_ptr; /* AX.25 specific data */ 389 390 /* 391 * Cache line mostly used on receive path (including eth_type_trans()) 392 */ 393 struct list_head poll_list ____cacheline_aligned_in_smp; 394 /* Link to poll list */ 395 396 int (*poll) (struct net_device *dev, int *quota); 397 int quota; 398 int weight; 399 unsigned long last_rx; /* Time of last Rx */ 400 /* Interface address info used in eth_type_trans() */ 401 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 402 because most packets are unicast) */ 403 404 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 405 406 /* 407 * Cache line mostly used on queue transmit path (qdisc) 408 */ 409 /* device queue lock */ 410 spinlock_t queue_lock ____cacheline_aligned_in_smp; 411 struct Qdisc *qdisc; 412 struct Qdisc *qdisc_sleeping; 413 struct list_head qdisc_list; 414 unsigned long tx_queue_len; /* Max frames per queue allowed */ 415 416 /* Partially transmitted GSO packet. */ 417 struct sk_buff *gso_skb; 418 419 /* ingress path synchronizer */ 420 spinlock_t ingress_lock; 421 struct Qdisc *qdisc_ingress; 422 423 /* 424 * One part is mostly used on xmit path (device) 425 */ 426 /* hard_start_xmit synchronizer */ 427 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 428 /* cpu id of processor entered to hard_start_xmit or -1, 429 if nobody entered there. 430 */ 431 int xmit_lock_owner; 432 void *priv; /* pointer to private data */ 433 int (*hard_start_xmit) (struct sk_buff *skb, 434 struct net_device *dev); 435 /* These may be needed for future network-power-down code. */ 436 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 437 438 int watchdog_timeo; /* used by dev_watchdog() */ 439 struct timer_list watchdog_timer; 440 441 /* 442 * refcnt is a very hot point, so align it on SMP 443 */ 444 /* Number of references to this device */ 445 atomic_t refcnt ____cacheline_aligned_in_smp; 446 447 /* delayed register/unregister */ 448 struct list_head todo_list; 449 /* device index hash chain */ 450 struct hlist_node index_hlist; 451 452 /* register/unregister state machine */ 453 enum { NETREG_UNINITIALIZED=0, 454 NETREG_REGISTERED, /* completed register_netdevice */ 455 NETREG_UNREGISTERING, /* called unregister_netdevice */ 456 NETREG_UNREGISTERED, /* completed unregister todo */ 457 NETREG_RELEASED, /* called free_netdev */ 458 } reg_state; 459 460 /* Called after device is detached from network. */ 461 void (*uninit)(struct net_device *dev); 462 /* Called after last user reference disappears. */ 463 void (*destructor)(struct net_device *dev); 464 465 /* Pointers to interface service routines. */ 466 int (*open)(struct net_device *dev); 467 int (*stop)(struct net_device *dev); 468 #define HAVE_NETDEV_POLL 469 int (*hard_header) (struct sk_buff *skb, 470 struct net_device *dev, 471 unsigned short type, 472 void *daddr, 473 void *saddr, 474 unsigned len); 475 int (*rebuild_header)(struct sk_buff *skb); 476 #define HAVE_MULTICAST 477 void (*set_multicast_list)(struct net_device *dev); 478 #define HAVE_SET_MAC_ADDR 479 int (*set_mac_address)(struct net_device *dev, 480 void *addr); 481 #define HAVE_PRIVATE_IOCTL 482 int (*do_ioctl)(struct net_device *dev, 483 struct ifreq *ifr, int cmd); 484 #define HAVE_SET_CONFIG 485 int (*set_config)(struct net_device *dev, 486 struct ifmap *map); 487 #define HAVE_HEADER_CACHE 488 int (*hard_header_cache)(struct neighbour *neigh, 489 struct hh_cache *hh); 490 void (*header_cache_update)(struct hh_cache *hh, 491 struct net_device *dev, 492 unsigned char * haddr); 493 #define HAVE_CHANGE_MTU 494 int (*change_mtu)(struct net_device *dev, int new_mtu); 495 496 #define HAVE_TX_TIMEOUT 497 void (*tx_timeout) (struct net_device *dev); 498 499 void (*vlan_rx_register)(struct net_device *dev, 500 struct vlan_group *grp); 501 void (*vlan_rx_add_vid)(struct net_device *dev, 502 unsigned short vid); 503 void (*vlan_rx_kill_vid)(struct net_device *dev, 504 unsigned short vid); 505 506 int (*hard_header_parse)(struct sk_buff *skb, 507 unsigned char *haddr); 508 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 509 #ifdef CONFIG_NETPOLL 510 struct netpoll_info *npinfo; 511 #endif 512 #ifdef CONFIG_NET_POLL_CONTROLLER 513 void (*poll_controller)(struct net_device *dev); 514 #endif 515 516 /* bridge stuff */ 517 struct net_bridge_port *br_port; 518 519 #ifdef CONFIG_NET_DIVERT 520 /* this will get initialized at each interface type init routine */ 521 struct divert_blk *divert; 522 #endif /* CONFIG_NET_DIVERT */ 523 524 /* class/net/name entry */ 525 struct class_device class_dev; 526 /* space for optional statistics and wireless sysfs groups */ 527 struct attribute_group *sysfs_groups[3]; 528 }; 529 530 #define NETDEV_ALIGN 32 531 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 532 533 static inline void *netdev_priv(struct net_device *dev) 534 { 535 return (char *)dev + ((sizeof(struct net_device) 536 + NETDEV_ALIGN_CONST) 537 & ~NETDEV_ALIGN_CONST); 538 } 539 540 #define SET_MODULE_OWNER(dev) do { } while (0) 541 /* Set the sysfs physical device reference for the network logical device 542 * if set prior to registration will cause a symlink during initialization. 543 */ 544 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev)) 545 546 struct packet_type { 547 __be16 type; /* This is really htons(ether_type). */ 548 struct net_device *dev; /* NULL is wildcarded here */ 549 int (*func) (struct sk_buff *, 550 struct net_device *, 551 struct packet_type *, 552 struct net_device *); 553 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 554 int features); 555 int (*gso_send_check)(struct sk_buff *skb); 556 void *af_packet_priv; 557 struct list_head list; 558 }; 559 560 #include <linux/interrupt.h> 561 #include <linux/notifier.h> 562 563 extern struct net_device loopback_dev; /* The loopback */ 564 extern struct net_device *dev_base; /* All devices */ 565 extern rwlock_t dev_base_lock; /* Device list lock */ 566 567 extern int netdev_boot_setup_check(struct net_device *dev); 568 extern unsigned long netdev_boot_base(const char *prefix, int unit); 569 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 570 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 571 extern void dev_add_pack(struct packet_type *pt); 572 extern void dev_remove_pack(struct packet_type *pt); 573 extern void __dev_remove_pack(struct packet_type *pt); 574 575 extern struct net_device *dev_get_by_flags(unsigned short flags, 576 unsigned short mask); 577 extern struct net_device *dev_get_by_name(const char *name); 578 extern struct net_device *__dev_get_by_name(const char *name); 579 extern int dev_alloc_name(struct net_device *dev, const char *name); 580 extern int dev_open(struct net_device *dev); 581 extern int dev_close(struct net_device *dev); 582 extern int dev_queue_xmit(struct sk_buff *skb); 583 extern int register_netdevice(struct net_device *dev); 584 extern int unregister_netdevice(struct net_device *dev); 585 extern void free_netdev(struct net_device *dev); 586 extern void synchronize_net(void); 587 extern int register_netdevice_notifier(struct notifier_block *nb); 588 extern int unregister_netdevice_notifier(struct notifier_block *nb); 589 extern int call_netdevice_notifiers(unsigned long val, void *v); 590 extern struct net_device *dev_get_by_index(int ifindex); 591 extern struct net_device *__dev_get_by_index(int ifindex); 592 extern int dev_restart(struct net_device *dev); 593 #ifdef CONFIG_NETPOLL_TRAP 594 extern int netpoll_trap(void); 595 #endif 596 597 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 598 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 599 static inline int unregister_gifconf(unsigned int family) 600 { 601 return register_gifconf(family, NULL); 602 } 603 604 /* 605 * Incoming packets are placed on per-cpu queues so that 606 * no locking is needed. 607 */ 608 609 struct softnet_data 610 { 611 struct net_device *output_queue; 612 struct sk_buff_head input_pkt_queue; 613 struct list_head poll_list; 614 struct sk_buff *completion_queue; 615 616 struct net_device backlog_dev; /* Sorry. 8) */ 617 #ifdef CONFIG_NET_DMA 618 struct dma_chan *net_dma; 619 #endif 620 }; 621 622 DECLARE_PER_CPU(struct softnet_data,softnet_data); 623 624 #define HAVE_NETIF_QUEUE 625 626 extern void __netif_schedule(struct net_device *dev); 627 628 static inline void netif_schedule(struct net_device *dev) 629 { 630 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 631 __netif_schedule(dev); 632 } 633 634 static inline void netif_start_queue(struct net_device *dev) 635 { 636 clear_bit(__LINK_STATE_XOFF, &dev->state); 637 } 638 639 static inline void netif_wake_queue(struct net_device *dev) 640 { 641 #ifdef CONFIG_NETPOLL_TRAP 642 if (netpoll_trap()) 643 return; 644 #endif 645 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 646 __netif_schedule(dev); 647 } 648 649 static inline void netif_stop_queue(struct net_device *dev) 650 { 651 #ifdef CONFIG_NETPOLL_TRAP 652 if (netpoll_trap()) 653 return; 654 #endif 655 set_bit(__LINK_STATE_XOFF, &dev->state); 656 } 657 658 static inline int netif_queue_stopped(const struct net_device *dev) 659 { 660 return test_bit(__LINK_STATE_XOFF, &dev->state); 661 } 662 663 static inline int netif_running(const struct net_device *dev) 664 { 665 return test_bit(__LINK_STATE_START, &dev->state); 666 } 667 668 669 /* Use this variant when it is known for sure that it 670 * is executing from interrupt context. 671 */ 672 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 673 { 674 if (atomic_dec_and_test(&skb->users)) { 675 struct softnet_data *sd; 676 unsigned long flags; 677 678 local_irq_save(flags); 679 sd = &__get_cpu_var(softnet_data); 680 skb->next = sd->completion_queue; 681 sd->completion_queue = skb; 682 raise_softirq_irqoff(NET_TX_SOFTIRQ); 683 local_irq_restore(flags); 684 } 685 } 686 687 /* Use this variant in places where it could be invoked 688 * either from interrupt or non-interrupt context. 689 */ 690 extern void dev_kfree_skb_any(struct sk_buff *skb); 691 692 #define HAVE_NETIF_RX 1 693 extern int netif_rx(struct sk_buff *skb); 694 extern int netif_rx_ni(struct sk_buff *skb); 695 #define HAVE_NETIF_RECEIVE_SKB 1 696 extern int netif_receive_skb(struct sk_buff *skb); 697 extern int dev_valid_name(const char *name); 698 extern int dev_ioctl(unsigned int cmd, void __user *); 699 extern int dev_ethtool(struct ifreq *); 700 extern unsigned dev_get_flags(const struct net_device *); 701 extern int dev_change_flags(struct net_device *, unsigned); 702 extern int dev_change_name(struct net_device *, char *); 703 extern int dev_set_mtu(struct net_device *, int); 704 extern int dev_set_mac_address(struct net_device *, 705 struct sockaddr *); 706 extern int dev_hard_start_xmit(struct sk_buff *skb, 707 struct net_device *dev); 708 709 extern void dev_init(void); 710 711 extern int netdev_budget; 712 713 /* Called by rtnetlink.c:rtnl_unlock() */ 714 extern void netdev_run_todo(void); 715 716 static inline void dev_put(struct net_device *dev) 717 { 718 atomic_dec(&dev->refcnt); 719 } 720 721 static inline void dev_hold(struct net_device *dev) 722 { 723 atomic_inc(&dev->refcnt); 724 } 725 726 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 727 * and _off may be called from IRQ context, but it is caller 728 * who is responsible for serialization of these calls. 729 * 730 * The name carrier is inappropriate, these functions should really be 731 * called netif_lowerlayer_*() because they represent the state of any 732 * kind of lower layer not just hardware media. 733 */ 734 735 extern void linkwatch_fire_event(struct net_device *dev); 736 737 static inline int netif_carrier_ok(const struct net_device *dev) 738 { 739 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 740 } 741 742 extern void __netdev_watchdog_up(struct net_device *dev); 743 744 extern void netif_carrier_on(struct net_device *dev); 745 746 extern void netif_carrier_off(struct net_device *dev); 747 748 static inline void netif_dormant_on(struct net_device *dev) 749 { 750 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 751 linkwatch_fire_event(dev); 752 } 753 754 static inline void netif_dormant_off(struct net_device *dev) 755 { 756 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 757 linkwatch_fire_event(dev); 758 } 759 760 static inline int netif_dormant(const struct net_device *dev) 761 { 762 return test_bit(__LINK_STATE_DORMANT, &dev->state); 763 } 764 765 766 static inline int netif_oper_up(const struct net_device *dev) { 767 return (dev->operstate == IF_OPER_UP || 768 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 769 } 770 771 /* Hot-plugging. */ 772 static inline int netif_device_present(struct net_device *dev) 773 { 774 return test_bit(__LINK_STATE_PRESENT, &dev->state); 775 } 776 777 extern void netif_device_detach(struct net_device *dev); 778 779 extern void netif_device_attach(struct net_device *dev); 780 781 /* 782 * Network interface message level settings 783 */ 784 #define HAVE_NETIF_MSG 1 785 786 enum { 787 NETIF_MSG_DRV = 0x0001, 788 NETIF_MSG_PROBE = 0x0002, 789 NETIF_MSG_LINK = 0x0004, 790 NETIF_MSG_TIMER = 0x0008, 791 NETIF_MSG_IFDOWN = 0x0010, 792 NETIF_MSG_IFUP = 0x0020, 793 NETIF_MSG_RX_ERR = 0x0040, 794 NETIF_MSG_TX_ERR = 0x0080, 795 NETIF_MSG_TX_QUEUED = 0x0100, 796 NETIF_MSG_INTR = 0x0200, 797 NETIF_MSG_TX_DONE = 0x0400, 798 NETIF_MSG_RX_STATUS = 0x0800, 799 NETIF_MSG_PKTDATA = 0x1000, 800 NETIF_MSG_HW = 0x2000, 801 NETIF_MSG_WOL = 0x4000, 802 }; 803 804 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 805 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 806 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 807 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 808 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 809 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 810 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 811 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 812 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 813 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 814 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 815 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 816 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 817 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 818 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 819 820 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 821 { 822 /* use default */ 823 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 824 return default_msg_enable_bits; 825 if (debug_value == 0) /* no output */ 826 return 0; 827 /* set low N bits */ 828 return (1 << debug_value) - 1; 829 } 830 831 /* Test if receive needs to be scheduled */ 832 static inline int __netif_rx_schedule_prep(struct net_device *dev) 833 { 834 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state); 835 } 836 837 /* Test if receive needs to be scheduled but only if up */ 838 static inline int netif_rx_schedule_prep(struct net_device *dev) 839 { 840 return netif_running(dev) && __netif_rx_schedule_prep(dev); 841 } 842 843 /* Add interface to tail of rx poll list. This assumes that _prep has 844 * already been called and returned 1. 845 */ 846 847 extern void __netif_rx_schedule(struct net_device *dev); 848 849 /* Try to reschedule poll. Called by irq handler. */ 850 851 static inline void netif_rx_schedule(struct net_device *dev) 852 { 853 if (netif_rx_schedule_prep(dev)) 854 __netif_rx_schedule(dev); 855 } 856 857 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 858 * Do not inline this? 859 */ 860 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 861 { 862 if (netif_rx_schedule_prep(dev)) { 863 unsigned long flags; 864 865 dev->quota += undo; 866 867 local_irq_save(flags); 868 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 869 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 870 local_irq_restore(flags); 871 return 1; 872 } 873 return 0; 874 } 875 876 /* Remove interface from poll list: it must be in the poll list 877 * on current cpu. This primitive is called by dev->poll(), when 878 * it completes the work. The device cannot be out of poll list at this 879 * moment, it is BUG(). 880 */ 881 static inline void netif_rx_complete(struct net_device *dev) 882 { 883 unsigned long flags; 884 885 local_irq_save(flags); 886 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 887 list_del(&dev->poll_list); 888 smp_mb__before_clear_bit(); 889 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 890 local_irq_restore(flags); 891 } 892 893 static inline void netif_poll_disable(struct net_device *dev) 894 { 895 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) 896 /* No hurry. */ 897 schedule_timeout_interruptible(1); 898 } 899 900 static inline void netif_poll_enable(struct net_device *dev) 901 { 902 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 903 } 904 905 /* same as netif_rx_complete, except that local_irq_save(flags) 906 * has already been issued 907 */ 908 static inline void __netif_rx_complete(struct net_device *dev) 909 { 910 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 911 list_del(&dev->poll_list); 912 smp_mb__before_clear_bit(); 913 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 914 } 915 916 static inline void netif_tx_lock(struct net_device *dev) 917 { 918 spin_lock(&dev->_xmit_lock); 919 dev->xmit_lock_owner = smp_processor_id(); 920 } 921 922 static inline void netif_tx_lock_bh(struct net_device *dev) 923 { 924 spin_lock_bh(&dev->_xmit_lock); 925 dev->xmit_lock_owner = smp_processor_id(); 926 } 927 928 static inline int netif_tx_trylock(struct net_device *dev) 929 { 930 int ok = spin_trylock(&dev->_xmit_lock); 931 if (likely(ok)) 932 dev->xmit_lock_owner = smp_processor_id(); 933 return ok; 934 } 935 936 static inline void netif_tx_unlock(struct net_device *dev) 937 { 938 dev->xmit_lock_owner = -1; 939 spin_unlock(&dev->_xmit_lock); 940 } 941 942 static inline void netif_tx_unlock_bh(struct net_device *dev) 943 { 944 dev->xmit_lock_owner = -1; 945 spin_unlock_bh(&dev->_xmit_lock); 946 } 947 948 static inline void netif_tx_disable(struct net_device *dev) 949 { 950 netif_tx_lock_bh(dev); 951 netif_stop_queue(dev); 952 netif_tx_unlock_bh(dev); 953 } 954 955 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 956 957 extern void ether_setup(struct net_device *dev); 958 959 /* Support for loadable net-drivers */ 960 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name, 961 void (*setup)(struct net_device *)); 962 extern int register_netdev(struct net_device *dev); 963 extern void unregister_netdev(struct net_device *dev); 964 /* Functions used for multicast support */ 965 extern void dev_mc_upload(struct net_device *dev); 966 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 967 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 968 extern void dev_mc_discard(struct net_device *dev); 969 extern void dev_set_promiscuity(struct net_device *dev, int inc); 970 extern void dev_set_allmulti(struct net_device *dev, int inc); 971 extern void netdev_state_change(struct net_device *dev); 972 extern void netdev_features_change(struct net_device *dev); 973 /* Load a device via the kmod */ 974 extern void dev_load(const char *name); 975 extern void dev_mcast_init(void); 976 extern int netdev_max_backlog; 977 extern int weight_p; 978 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 979 extern int skb_checksum_help(struct sk_buff *skb, int inward); 980 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 981 #ifdef CONFIG_BUG 982 extern void netdev_rx_csum_fault(struct net_device *dev); 983 #else 984 static inline void netdev_rx_csum_fault(struct net_device *dev) 985 { 986 } 987 #endif 988 /* rx skb timestamps */ 989 extern void net_enable_timestamp(void); 990 extern void net_disable_timestamp(void); 991 992 #ifdef CONFIG_PROC_FS 993 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 994 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 995 extern void dev_seq_stop(struct seq_file *seq, void *v); 996 #endif 997 998 extern void linkwatch_run_queue(void); 999 1000 static inline int net_gso_ok(int features, int gso_type) 1001 { 1002 int feature = gso_type << NETIF_F_GSO_SHIFT; 1003 return (features & feature) == feature; 1004 } 1005 1006 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1007 { 1008 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1009 } 1010 1011 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1012 { 1013 return skb_is_gso(skb) && 1014 (!skb_gso_ok(skb, dev->features) || 1015 unlikely(skb->ip_summed != CHECKSUM_HW)); 1016 } 1017 1018 /* On bonding slaves other than the currently active slave, suppress 1019 * duplicates except for 802.3ad ETH_P_SLOW and alb non-mcast/bcast. 1020 */ 1021 static inline int skb_bond_should_drop(struct sk_buff *skb) 1022 { 1023 struct net_device *dev = skb->dev; 1024 struct net_device *master = dev->master; 1025 1026 if (master && 1027 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1028 if (master->priv_flags & IFF_MASTER_ALB) { 1029 if (skb->pkt_type != PACKET_BROADCAST && 1030 skb->pkt_type != PACKET_MULTICAST) 1031 return 0; 1032 } 1033 if (master->priv_flags & IFF_MASTER_8023AD && 1034 skb->protocol == __constant_htons(ETH_P_SLOW)) 1035 return 0; 1036 1037 return 1; 1038 } 1039 return 0; 1040 } 1041 1042 #endif /* __KERNEL__ */ 1043 1044 #endif /* _LINUX_DEV_H */ 1045
