1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for the Interfaces handler. 7 * 8 * Version: @(#)dev.h 1.0.10 08/12/93 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <[email protected]> 12 * Corey Minyard <[email protected]> 13 * Donald J. Becker, <[email protected]> 14 * Alan Cox, <[email protected]> 15 * Bjorn Ekwall. <[email protected]> 16 * Pekka Riikonen <[email protected]> 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 * 23 * Moved to /usr/include/linux for NET3 24 */ 25 #ifndef _LINUX_NETDEVICE_H 26 #define _LINUX_NETDEVICE_H 27 28 #include <linux/if.h> 29 #include <linux/if_ether.h> 30 #include <linux/if_packet.h> 31 32 #ifdef __KERNEL__ 33 #include <asm/atomic.h> 34 #include <asm/cache.h> 35 #include <asm/byteorder.h> 36 37 #include <linux/config.h> 38 #include <linux/device.h> 39 #include <linux/percpu.h> 40 41 struct divert_blk; 42 struct vlan_group; 43 struct ethtool_ops; 44 struct netpoll_info; 45 /* source back-compat hooks */ 46 #define SET_ETHTOOL_OPS(netdev,ops) \ 47 ( (netdev)->ethtool_ops = (ops) ) 48 49 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 50 functions are available. */ 51 #define HAVE_FREE_NETDEV /* free_netdev() */ 52 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 53 54 #define NET_XMIT_SUCCESS 0 55 #define NET_XMIT_DROP 1 /* skb dropped */ 56 #define NET_XMIT_CN 2 /* congestion notification */ 57 #define NET_XMIT_POLICED 3 /* skb is shot by police */ 58 #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue; 59 (TC use only - dev_queue_xmit 60 returns this as NET_XMIT_SUCCESS) */ 61 62 /* Backlog congestion levels */ 63 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 64 #define NET_RX_DROP 1 /* packet dropped */ 65 #define NET_RX_CN_LOW 2 /* storm alert, just in case */ 66 #define NET_RX_CN_MOD 3 /* Storm on its way! */ 67 #define NET_RX_CN_HIGH 4 /* The storm is here */ 68 #define NET_RX_BAD 5 /* packet dropped due to kernel error */ 69 70 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 71 72 #endif 73 74 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 75 76 /* Driver transmit return codes */ 77 #define NETDEV_TX_OK 0 /* driver took care of packet */ 78 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ 79 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ 80 81 /* 82 * Compute the worst case header length according to the protocols 83 * used. 84 */ 85 86 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR) 87 #define LL_MAX_HEADER 32 88 #else 89 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 90 #define LL_MAX_HEADER 96 91 #else 92 #define LL_MAX_HEADER 48 93 #endif 94 #endif 95 96 #if !defined(CONFIG_NET_IPIP) && \ 97 !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) 98 #define MAX_HEADER LL_MAX_HEADER 99 #else 100 #define MAX_HEADER (LL_MAX_HEADER + 48) 101 #endif 102 103 /* 104 * Network device statistics. Akin to the 2.0 ether stats but 105 * with byte counters. 106 */ 107 108 struct net_device_stats 109 { 110 unsigned long rx_packets; /* total packets received */ 111 unsigned long tx_packets; /* total packets transmitted */ 112 unsigned long rx_bytes; /* total bytes received */ 113 unsigned long tx_bytes; /* total bytes transmitted */ 114 unsigned long rx_errors; /* bad packets received */ 115 unsigned long tx_errors; /* packet transmit problems */ 116 unsigned long rx_dropped; /* no space in linux buffers */ 117 unsigned long tx_dropped; /* no space available in linux */ 118 unsigned long multicast; /* multicast packets received */ 119 unsigned long collisions; 120 121 /* detailed rx_errors: */ 122 unsigned long rx_length_errors; 123 unsigned long rx_over_errors; /* receiver ring buff overflow */ 124 unsigned long rx_crc_errors; /* recved pkt with crc error */ 125 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 126 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 127 unsigned long rx_missed_errors; /* receiver missed packet */ 128 129 /* detailed tx_errors */ 130 unsigned long tx_aborted_errors; 131 unsigned long tx_carrier_errors; 132 unsigned long tx_fifo_errors; 133 unsigned long tx_heartbeat_errors; 134 unsigned long tx_window_errors; 135 136 /* for cslip etc */ 137 unsigned long rx_compressed; 138 unsigned long tx_compressed; 139 }; 140 141 142 /* Media selection options. */ 143 enum { 144 IF_PORT_UNKNOWN = 0, 145 IF_PORT_10BASE2, 146 IF_PORT_10BASET, 147 IF_PORT_AUI, 148 IF_PORT_100BASET, 149 IF_PORT_100BASETX, 150 IF_PORT_100BASEFX 151 }; 152 153 #ifdef __KERNEL__ 154 155 #include <linux/cache.h> 156 #include <linux/skbuff.h> 157 158 struct neighbour; 159 struct neigh_parms; 160 struct sk_buff; 161 162 struct netif_rx_stats 163 { 164 unsigned total; 165 unsigned dropped; 166 unsigned time_squeeze; 167 unsigned cpu_collision; 168 }; 169 170 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 171 172 173 /* 174 * We tag multicasts with these structures. 175 */ 176 177 struct dev_mc_list 178 { 179 struct dev_mc_list *next; 180 __u8 dmi_addr[MAX_ADDR_LEN]; 181 unsigned char dmi_addrlen; 182 int dmi_users; 183 int dmi_gusers; 184 }; 185 186 struct hh_cache 187 { 188 struct hh_cache *hh_next; /* Next entry */ 189 atomic_t hh_refcnt; /* number of users */ 190 unsigned short hh_type; /* protocol identifier, f.e ETH_P_IP 191 * NOTE: For VLANs, this will be the 192 * encapuslated type. --BLG 193 */ 194 int hh_len; /* length of header */ 195 int (*hh_output)(struct sk_buff *skb); 196 rwlock_t hh_lock; 197 198 /* cached hardware header; allow for machine alignment needs. */ 199 #define HH_DATA_MOD 16 200 #define HH_DATA_OFF(__len) \ 201 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 202 #define HH_DATA_ALIGN(__len) \ 203 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 204 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 205 }; 206 207 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 208 * Alternative is: 209 * dev->hard_header_len ? (dev->hard_header_len + 210 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 211 * 212 * We could use other alignment values, but we must maintain the 213 * relationship HH alignment <= LL alignment. 214 */ 215 #define LL_RESERVED_SPACE(dev) \ 216 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 217 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 218 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 219 220 /* These flag bits are private to the generic network queueing 221 * layer, they may not be explicitly referenced by any other 222 * code. 223 */ 224 225 enum netdev_state_t 226 { 227 __LINK_STATE_XOFF=0, 228 __LINK_STATE_START, 229 __LINK_STATE_PRESENT, 230 __LINK_STATE_SCHED, 231 __LINK_STATE_NOCARRIER, 232 __LINK_STATE_RX_SCHED, 233 __LINK_STATE_LINKWATCH_PENDING, 234 __LINK_STATE_DORMANT, 235 }; 236 237 238 /* 239 * This structure holds at boot time configured netdevice settings. They 240 * are then used in the device probing. 241 */ 242 struct netdev_boot_setup { 243 char name[IFNAMSIZ]; 244 struct ifmap map; 245 }; 246 #define NETDEV_BOOT_SETUP_MAX 8 247 248 extern int __init netdev_boot_setup(char *str); 249 250 /* 251 * The DEVICE structure. 252 * Actually, this whole structure is a big mistake. It mixes I/O 253 * data with strictly "high-level" data, and it has to know about 254 * almost every data structure used in the INET module. 255 * 256 * FIXME: cleanup struct net_device such that network protocol info 257 * moves out. 258 */ 259 260 struct net_device 261 { 262 263 /* 264 * This is the first field of the "visible" part of this structure 265 * (i.e. as seen by users in the "Space.c" file). It is the name 266 * the interface. 267 */ 268 char name[IFNAMSIZ]; 269 /* device name hash chain */ 270 struct hlist_node name_hlist; 271 272 /* 273 * I/O specific fields 274 * FIXME: Merge these and struct ifmap into one 275 */ 276 unsigned long mem_end; /* shared mem end */ 277 unsigned long mem_start; /* shared mem start */ 278 unsigned long base_addr; /* device I/O address */ 279 unsigned int irq; /* device IRQ number */ 280 281 /* 282 * Some hardware also needs these fields, but they are not 283 * part of the usual set specified in Space.c. 284 */ 285 286 unsigned char if_port; /* Selectable AUI, TP,..*/ 287 unsigned char dma; /* DMA channel */ 288 289 unsigned long state; 290 291 struct net_device *next; 292 293 /* The device initialization function. Called only once. */ 294 int (*init)(struct net_device *dev); 295 296 /* ------- Fields preinitialized in Space.c finish here ------- */ 297 298 /* Net device features */ 299 unsigned long features; 300 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 301 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */ 302 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 303 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 304 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 305 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 306 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 307 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 308 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 309 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 310 #define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */ 311 #define NETIF_F_LLTX 4096 /* LockLess TX */ 312 #define NETIF_F_UFO 8192 /* Can offload UDP Large Send*/ 313 314 struct net_device *next_sched; 315 316 /* Interface index. Unique device identifier */ 317 int ifindex; 318 int iflink; 319 320 321 struct net_device_stats* (*get_stats)(struct net_device *dev); 322 struct iw_statistics* (*get_wireless_stats)(struct net_device *dev); 323 324 /* List of functions to handle Wireless Extensions (instead of ioctl). 325 * See <net/iw_handler.h> for details. Jean II */ 326 const struct iw_handler_def * wireless_handlers; 327 /* Instance data managed by the core of Wireless Extensions. */ 328 struct iw_public_data * wireless_data; 329 330 struct ethtool_ops *ethtool_ops; 331 332 /* 333 * This marks the end of the "visible" part of the structure. All 334 * fields hereafter are internal to the system, and may change at 335 * will (read: may be cleaned up at will). 336 */ 337 338 339 unsigned int flags; /* interface flags (a la BSD) */ 340 unsigned short gflags; 341 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 342 unsigned short padded; /* How much padding added by alloc_netdev() */ 343 344 unsigned char operstate; /* RFC2863 operstate */ 345 unsigned char link_mode; /* mapping policy to operstate */ 346 347 unsigned mtu; /* interface MTU value */ 348 unsigned short type; /* interface hardware type */ 349 unsigned short hard_header_len; /* hardware hdr length */ 350 351 struct net_device *master; /* Pointer to master device of a group, 352 * which this device is member of. 353 */ 354 355 /* Interface address info. */ 356 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 357 unsigned char addr_len; /* hardware address length */ 358 unsigned short dev_id; /* for shared network cards */ 359 360 struct dev_mc_list *mc_list; /* Multicast mac addresses */ 361 int mc_count; /* Number of installed mcasts */ 362 int promiscuity; 363 int allmulti; 364 365 366 /* Protocol specific pointers */ 367 368 void *atalk_ptr; /* AppleTalk link */ 369 void *ip_ptr; /* IPv4 specific data */ 370 void *dn_ptr; /* DECnet specific data */ 371 void *ip6_ptr; /* IPv6 specific data */ 372 void *ec_ptr; /* Econet specific data */ 373 void *ax25_ptr; /* AX.25 specific data */ 374 375 /* 376 * Cache line mostly used on receive path (including eth_type_trans()) 377 */ 378 struct list_head poll_list ____cacheline_aligned_in_smp; 379 /* Link to poll list */ 380 381 int (*poll) (struct net_device *dev, int *quota); 382 int quota; 383 int weight; 384 unsigned long last_rx; /* Time of last Rx */ 385 /* Interface address info used in eth_type_trans() */ 386 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 387 because most packets are unicast) */ 388 389 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 390 391 /* 392 * Cache line mostly used on queue transmit path (qdisc) 393 */ 394 /* device queue lock */ 395 spinlock_t queue_lock ____cacheline_aligned_in_smp; 396 struct Qdisc *qdisc; 397 struct Qdisc *qdisc_sleeping; 398 struct list_head qdisc_list; 399 unsigned long tx_queue_len; /* Max frames per queue allowed */ 400 401 /* ingress path synchronizer */ 402 spinlock_t ingress_lock; 403 struct Qdisc *qdisc_ingress; 404 405 /* 406 * One part is mostly used on xmit path (device) 407 */ 408 /* hard_start_xmit synchronizer */ 409 spinlock_t xmit_lock ____cacheline_aligned_in_smp; 410 /* cpu id of processor entered to hard_start_xmit or -1, 411 if nobody entered there. 412 */ 413 int xmit_lock_owner; 414 void *priv; /* pointer to private data */ 415 int (*hard_start_xmit) (struct sk_buff *skb, 416 struct net_device *dev); 417 /* These may be needed for future network-power-down code. */ 418 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 419 420 int watchdog_timeo; /* used by dev_watchdog() */ 421 struct timer_list watchdog_timer; 422 423 /* 424 * refcnt is a very hot point, so align it on SMP 425 */ 426 /* Number of references to this device */ 427 atomic_t refcnt ____cacheline_aligned_in_smp; 428 429 /* delayed register/unregister */ 430 struct list_head todo_list; 431 /* device index hash chain */ 432 struct hlist_node index_hlist; 433 434 /* register/unregister state machine */ 435 enum { NETREG_UNINITIALIZED=0, 436 NETREG_REGISTERING, /* called register_netdevice */ 437 NETREG_REGISTERED, /* completed register todo */ 438 NETREG_UNREGISTERING, /* called unregister_netdevice */ 439 NETREG_UNREGISTERED, /* completed unregister todo */ 440 NETREG_RELEASED, /* called free_netdev */ 441 } reg_state; 442 443 /* Called after device is detached from network. */ 444 void (*uninit)(struct net_device *dev); 445 /* Called after last user reference disappears. */ 446 void (*destructor)(struct net_device *dev); 447 448 /* Pointers to interface service routines. */ 449 int (*open)(struct net_device *dev); 450 int (*stop)(struct net_device *dev); 451 #define HAVE_NETDEV_POLL 452 int (*hard_header) (struct sk_buff *skb, 453 struct net_device *dev, 454 unsigned short type, 455 void *daddr, 456 void *saddr, 457 unsigned len); 458 int (*rebuild_header)(struct sk_buff *skb); 459 #define HAVE_MULTICAST 460 void (*set_multicast_list)(struct net_device *dev); 461 #define HAVE_SET_MAC_ADDR 462 int (*set_mac_address)(struct net_device *dev, 463 void *addr); 464 #define HAVE_PRIVATE_IOCTL 465 int (*do_ioctl)(struct net_device *dev, 466 struct ifreq *ifr, int cmd); 467 #define HAVE_SET_CONFIG 468 int (*set_config)(struct net_device *dev, 469 struct ifmap *map); 470 #define HAVE_HEADER_CACHE 471 int (*hard_header_cache)(struct neighbour *neigh, 472 struct hh_cache *hh); 473 void (*header_cache_update)(struct hh_cache *hh, 474 struct net_device *dev, 475 unsigned char * haddr); 476 #define HAVE_CHANGE_MTU 477 int (*change_mtu)(struct net_device *dev, int new_mtu); 478 479 #define HAVE_TX_TIMEOUT 480 void (*tx_timeout) (struct net_device *dev); 481 482 void (*vlan_rx_register)(struct net_device *dev, 483 struct vlan_group *grp); 484 void (*vlan_rx_add_vid)(struct net_device *dev, 485 unsigned short vid); 486 void (*vlan_rx_kill_vid)(struct net_device *dev, 487 unsigned short vid); 488 489 int (*hard_header_parse)(struct sk_buff *skb, 490 unsigned char *haddr); 491 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 492 #ifdef CONFIG_NETPOLL 493 struct netpoll_info *npinfo; 494 #endif 495 #ifdef CONFIG_NET_POLL_CONTROLLER 496 void (*poll_controller)(struct net_device *dev); 497 #endif 498 499 /* bridge stuff */ 500 struct net_bridge_port *br_port; 501 502 #ifdef CONFIG_NET_DIVERT 503 /* this will get initialized at each interface type init routine */ 504 struct divert_blk *divert; 505 #endif /* CONFIG_NET_DIVERT */ 506 507 /* class/net/name entry */ 508 struct class_device class_dev; 509 }; 510 511 #define NETDEV_ALIGN 32 512 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 513 514 static inline void *netdev_priv(struct net_device *dev) 515 { 516 return (char *)dev + ((sizeof(struct net_device) 517 + NETDEV_ALIGN_CONST) 518 & ~NETDEV_ALIGN_CONST); 519 } 520 521 #define SET_MODULE_OWNER(dev) do { } while (0) 522 /* Set the sysfs physical device reference for the network logical device 523 * if set prior to registration will cause a symlink during initialization. 524 */ 525 #define SET_NETDEV_DEV(net, pdev) ((net)->class_dev.dev = (pdev)) 526 527 struct packet_type { 528 __be16 type; /* This is really htons(ether_type). */ 529 struct net_device *dev; /* NULL is wildcarded here */ 530 int (*func) (struct sk_buff *, 531 struct net_device *, 532 struct packet_type *, 533 struct net_device *); 534 void *af_packet_priv; 535 struct list_head list; 536 }; 537 538 #include <linux/interrupt.h> 539 #include <linux/notifier.h> 540 541 extern struct net_device loopback_dev; /* The loopback */ 542 extern struct net_device *dev_base; /* All devices */ 543 extern rwlock_t dev_base_lock; /* Device list lock */ 544 545 extern int netdev_boot_setup_check(struct net_device *dev); 546 extern unsigned long netdev_boot_base(const char *prefix, int unit); 547 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 548 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 549 extern void dev_add_pack(struct packet_type *pt); 550 extern void dev_remove_pack(struct packet_type *pt); 551 extern void __dev_remove_pack(struct packet_type *pt); 552 553 extern struct net_device *dev_get_by_flags(unsigned short flags, 554 unsigned short mask); 555 extern struct net_device *dev_get_by_name(const char *name); 556 extern struct net_device *__dev_get_by_name(const char *name); 557 extern int dev_alloc_name(struct net_device *dev, const char *name); 558 extern int dev_open(struct net_device *dev); 559 extern int dev_close(struct net_device *dev); 560 extern int dev_queue_xmit(struct sk_buff *skb); 561 extern int register_netdevice(struct net_device *dev); 562 extern int unregister_netdevice(struct net_device *dev); 563 extern void free_netdev(struct net_device *dev); 564 extern void synchronize_net(void); 565 extern int register_netdevice_notifier(struct notifier_block *nb); 566 extern int unregister_netdevice_notifier(struct notifier_block *nb); 567 extern int call_netdevice_notifiers(unsigned long val, void *v); 568 extern struct net_device *dev_get_by_index(int ifindex); 569 extern struct net_device *__dev_get_by_index(int ifindex); 570 extern int dev_restart(struct net_device *dev); 571 #ifdef CONFIG_NETPOLL_TRAP 572 extern int netpoll_trap(void); 573 #endif 574 575 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 576 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 577 static inline int unregister_gifconf(unsigned int family) 578 { 579 return register_gifconf(family, NULL); 580 } 581 582 /* 583 * Incoming packets are placed on per-cpu queues so that 584 * no locking is needed. 585 */ 586 587 struct softnet_data 588 { 589 struct net_device *output_queue; 590 struct sk_buff_head input_pkt_queue; 591 struct list_head poll_list; 592 struct sk_buff *completion_queue; 593 594 struct net_device backlog_dev; /* Sorry. 8) */ 595 }; 596 597 DECLARE_PER_CPU(struct softnet_data,softnet_data); 598 599 #define HAVE_NETIF_QUEUE 600 601 static inline void __netif_schedule(struct net_device *dev) 602 { 603 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) { 604 unsigned long flags; 605 struct softnet_data *sd; 606 607 local_irq_save(flags); 608 sd = &__get_cpu_var(softnet_data); 609 dev->next_sched = sd->output_queue; 610 sd->output_queue = dev; 611 raise_softirq_irqoff(NET_TX_SOFTIRQ); 612 local_irq_restore(flags); 613 } 614 } 615 616 static inline void netif_schedule(struct net_device *dev) 617 { 618 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 619 __netif_schedule(dev); 620 } 621 622 static inline void netif_start_queue(struct net_device *dev) 623 { 624 clear_bit(__LINK_STATE_XOFF, &dev->state); 625 } 626 627 static inline void netif_wake_queue(struct net_device *dev) 628 { 629 #ifdef CONFIG_NETPOLL_TRAP 630 if (netpoll_trap()) 631 return; 632 #endif 633 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 634 __netif_schedule(dev); 635 } 636 637 static inline void netif_stop_queue(struct net_device *dev) 638 { 639 #ifdef CONFIG_NETPOLL_TRAP 640 if (netpoll_trap()) 641 return; 642 #endif 643 set_bit(__LINK_STATE_XOFF, &dev->state); 644 } 645 646 static inline int netif_queue_stopped(const struct net_device *dev) 647 { 648 return test_bit(__LINK_STATE_XOFF, &dev->state); 649 } 650 651 static inline int netif_running(const struct net_device *dev) 652 { 653 return test_bit(__LINK_STATE_START, &dev->state); 654 } 655 656 657 /* Use this variant when it is known for sure that it 658 * is executing from interrupt context. 659 */ 660 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 661 { 662 if (atomic_dec_and_test(&skb->users)) { 663 struct softnet_data *sd; 664 unsigned long flags; 665 666 local_irq_save(flags); 667 sd = &__get_cpu_var(softnet_data); 668 skb->next = sd->completion_queue; 669 sd->completion_queue = skb; 670 raise_softirq_irqoff(NET_TX_SOFTIRQ); 671 local_irq_restore(flags); 672 } 673 } 674 675 /* Use this variant in places where it could be invoked 676 * either from interrupt or non-interrupt context. 677 */ 678 static inline void dev_kfree_skb_any(struct sk_buff *skb) 679 { 680 if (in_irq() || irqs_disabled()) 681 dev_kfree_skb_irq(skb); 682 else 683 dev_kfree_skb(skb); 684 } 685 686 #define HAVE_NETIF_RX 1 687 extern int netif_rx(struct sk_buff *skb); 688 extern int netif_rx_ni(struct sk_buff *skb); 689 #define HAVE_NETIF_RECEIVE_SKB 1 690 extern int netif_receive_skb(struct sk_buff *skb); 691 extern int dev_valid_name(const char *name); 692 extern int dev_ioctl(unsigned int cmd, void __user *); 693 extern int dev_ethtool(struct ifreq *); 694 extern unsigned dev_get_flags(const struct net_device *); 695 extern int dev_change_flags(struct net_device *, unsigned); 696 extern int dev_change_name(struct net_device *, char *); 697 extern int dev_set_mtu(struct net_device *, int); 698 extern int dev_set_mac_address(struct net_device *, 699 struct sockaddr *); 700 extern void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 701 702 extern void dev_init(void); 703 704 extern int netdev_nit; 705 extern int netdev_budget; 706 707 /* Called by rtnetlink.c:rtnl_unlock() */ 708 extern void netdev_run_todo(void); 709 710 static inline void dev_put(struct net_device *dev) 711 { 712 atomic_dec(&dev->refcnt); 713 } 714 715 static inline void dev_hold(struct net_device *dev) 716 { 717 atomic_inc(&dev->refcnt); 718 } 719 720 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 721 * and _off may be called from IRQ context, but it is caller 722 * who is responsible for serialization of these calls. 723 * 724 * The name carrier is inappropriate, these functions should really be 725 * called netif_lowerlayer_*() because they represent the state of any 726 * kind of lower layer not just hardware media. 727 */ 728 729 extern void linkwatch_fire_event(struct net_device *dev); 730 731 static inline int netif_carrier_ok(const struct net_device *dev) 732 { 733 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 734 } 735 736 extern void __netdev_watchdog_up(struct net_device *dev); 737 738 extern void netif_carrier_on(struct net_device *dev); 739 740 extern void netif_carrier_off(struct net_device *dev); 741 742 static inline void netif_dormant_on(struct net_device *dev) 743 { 744 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 745 linkwatch_fire_event(dev); 746 } 747 748 static inline void netif_dormant_off(struct net_device *dev) 749 { 750 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 751 linkwatch_fire_event(dev); 752 } 753 754 static inline int netif_dormant(const struct net_device *dev) 755 { 756 return test_bit(__LINK_STATE_DORMANT, &dev->state); 757 } 758 759 760 static inline int netif_oper_up(const struct net_device *dev) { 761 return (dev->operstate == IF_OPER_UP || 762 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 763 } 764 765 /* Hot-plugging. */ 766 static inline int netif_device_present(struct net_device *dev) 767 { 768 return test_bit(__LINK_STATE_PRESENT, &dev->state); 769 } 770 771 static inline void netif_device_detach(struct net_device *dev) 772 { 773 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && 774 netif_running(dev)) { 775 netif_stop_queue(dev); 776 } 777 } 778 779 static inline void netif_device_attach(struct net_device *dev) 780 { 781 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && 782 netif_running(dev)) { 783 netif_wake_queue(dev); 784 __netdev_watchdog_up(dev); 785 } 786 } 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 static inline void __netif_rx_schedule(struct net_device *dev) 855 { 856 unsigned long flags; 857 858 local_irq_save(flags); 859 dev_hold(dev); 860 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 861 if (dev->quota < 0) 862 dev->quota += dev->weight; 863 else 864 dev->quota = dev->weight; 865 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 866 local_irq_restore(flags); 867 } 868 869 /* Try to reschedule poll. Called by irq handler. */ 870 871 static inline void netif_rx_schedule(struct net_device *dev) 872 { 873 if (netif_rx_schedule_prep(dev)) 874 __netif_rx_schedule(dev); 875 } 876 877 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 878 * Do not inline this? 879 */ 880 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 881 { 882 if (netif_rx_schedule_prep(dev)) { 883 unsigned long flags; 884 885 dev->quota += undo; 886 887 local_irq_save(flags); 888 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 889 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 890 local_irq_restore(flags); 891 return 1; 892 } 893 return 0; 894 } 895 896 /* Remove interface from poll list: it must be in the poll list 897 * on current cpu. This primitive is called by dev->poll(), when 898 * it completes the work. The device cannot be out of poll list at this 899 * moment, it is BUG(). 900 */ 901 static inline void netif_rx_complete(struct net_device *dev) 902 { 903 unsigned long flags; 904 905 local_irq_save(flags); 906 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 907 list_del(&dev->poll_list); 908 smp_mb__before_clear_bit(); 909 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 910 local_irq_restore(flags); 911 } 912 913 static inline void netif_poll_disable(struct net_device *dev) 914 { 915 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) 916 /* No hurry. */ 917 schedule_timeout_interruptible(1); 918 } 919 920 static inline void netif_poll_enable(struct net_device *dev) 921 { 922 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 923 } 924 925 /* same as netif_rx_complete, except that local_irq_save(flags) 926 * has already been issued 927 */ 928 static inline void __netif_rx_complete(struct net_device *dev) 929 { 930 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 931 list_del(&dev->poll_list); 932 smp_mb__before_clear_bit(); 933 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 934 } 935 936 static inline void netif_tx_disable(struct net_device *dev) 937 { 938 spin_lock_bh(&dev->xmit_lock); 939 netif_stop_queue(dev); 940 spin_unlock_bh(&dev->xmit_lock); 941 } 942 943 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 944 945 extern void ether_setup(struct net_device *dev); 946 947 /* Support for loadable net-drivers */ 948 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name, 949 void (*setup)(struct net_device *)); 950 extern int register_netdev(struct net_device *dev); 951 extern void unregister_netdev(struct net_device *dev); 952 /* Functions used for multicast support */ 953 extern void dev_mc_upload(struct net_device *dev); 954 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 955 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 956 extern void dev_mc_discard(struct net_device *dev); 957 extern void dev_set_promiscuity(struct net_device *dev, int inc); 958 extern void dev_set_allmulti(struct net_device *dev, int inc); 959 extern void netdev_state_change(struct net_device *dev); 960 extern void netdev_features_change(struct net_device *dev); 961 /* Load a device via the kmod */ 962 extern void dev_load(const char *name); 963 extern void dev_mcast_init(void); 964 extern int netdev_max_backlog; 965 extern int weight_p; 966 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 967 extern int skb_checksum_help(struct sk_buff *skb, int inward); 968 #ifdef CONFIG_BUG 969 extern void netdev_rx_csum_fault(struct net_device *dev); 970 #else 971 static inline void netdev_rx_csum_fault(struct net_device *dev) 972 { 973 } 974 #endif 975 /* rx skb timestamps */ 976 extern void net_enable_timestamp(void); 977 extern void net_disable_timestamp(void); 978 979 #ifdef CONFIG_PROC_FS 980 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 981 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 982 extern void dev_seq_stop(struct seq_file *seq, void *v); 983 #endif 984 985 extern void linkwatch_run_queue(void); 986 987 #endif /* __KERNEL__ */ 988 989 #endif /* _LINUX_DEV_H */ 990