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 <linux/delay.h> 35 #include <linux/mm.h> 36 #include <asm/atomic.h> 37 #include <asm/cache.h> 38 #include <asm/byteorder.h> 39 40 #include <linux/device.h> 41 #include <linux/percpu.h> 42 #include <linux/rculist.h> 43 #include <linux/dmaengine.h> 44 #include <linux/workqueue.h> 45 46 #include <linux/ethtool.h> 47 #include <net/net_namespace.h> 48 #include <net/dsa.h> 49 #ifdef CONFIG_DCB 50 #include <net/dcbnl.h> 51 #endif 52 53 struct vlan_group; 54 struct netpoll_info; 55 /* 802.11 specific */ 56 struct wireless_dev; 57 /* source back-compat hooks */ 58 #define SET_ETHTOOL_OPS(netdev,ops) \ 59 ( (netdev)->ethtool_ops = (ops) ) 60 61 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 62 functions are available. */ 63 #define HAVE_FREE_NETDEV /* free_netdev() */ 64 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 65 66 #define NET_XMIT_SUCCESS 0 67 #define NET_XMIT_DROP 1 /* skb dropped */ 68 #define NET_XMIT_CN 2 /* congestion notification */ 69 #define NET_XMIT_POLICED 3 /* skb is shot by police */ 70 #define NET_XMIT_MASK 0xFFFF /* qdisc flags in net/sch_generic.h */ 71 72 /* Backlog congestion levels */ 73 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 74 #define NET_RX_DROP 1 /* packet dropped */ 75 #define NET_RX_CN_LOW 2 /* storm alert, just in case */ 76 #define NET_RX_CN_MOD 3 /* Storm on its way! */ 77 #define NET_RX_CN_HIGH 4 /* The storm is here */ 78 #define NET_RX_BAD 5 /* packet dropped due to kernel error */ 79 80 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 81 * indicates that the device will soon be dropping packets, or already drops 82 * some packets of the same priority; prompting us to send less aggressively. */ 83 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e)) 84 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 85 86 #endif 87 88 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 89 90 /* Driver transmit return codes */ 91 #define NETDEV_TX_OK 0 /* driver took care of packet */ 92 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ 93 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ 94 95 #ifdef __KERNEL__ 96 97 /* 98 * Compute the worst case header length according to the protocols 99 * used. 100 */ 101 102 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 103 # if defined(CONFIG_MAC80211_MESH) 104 # define LL_MAX_HEADER 128 105 # else 106 # define LL_MAX_HEADER 96 107 # endif 108 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE) 109 # define LL_MAX_HEADER 48 110 #else 111 # define LL_MAX_HEADER 32 112 #endif 113 114 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 115 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 116 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 117 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 118 #define MAX_HEADER LL_MAX_HEADER 119 #else 120 #define MAX_HEADER (LL_MAX_HEADER + 48) 121 #endif 122 123 #endif /* __KERNEL__ */ 124 125 /* 126 * Network device statistics. Akin to the 2.0 ether stats but 127 * with byte counters. 128 */ 129 130 struct net_device_stats 131 { 132 unsigned long rx_packets; /* total packets received */ 133 unsigned long tx_packets; /* total packets transmitted */ 134 unsigned long rx_bytes; /* total bytes received */ 135 unsigned long tx_bytes; /* total bytes transmitted */ 136 unsigned long rx_errors; /* bad packets received */ 137 unsigned long tx_errors; /* packet transmit problems */ 138 unsigned long rx_dropped; /* no space in linux buffers */ 139 unsigned long tx_dropped; /* no space available in linux */ 140 unsigned long multicast; /* multicast packets received */ 141 unsigned long collisions; 142 143 /* detailed rx_errors: */ 144 unsigned long rx_length_errors; 145 unsigned long rx_over_errors; /* receiver ring buff overflow */ 146 unsigned long rx_crc_errors; /* recved pkt with crc error */ 147 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 148 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 149 unsigned long rx_missed_errors; /* receiver missed packet */ 150 151 /* detailed tx_errors */ 152 unsigned long tx_aborted_errors; 153 unsigned long tx_carrier_errors; 154 unsigned long tx_fifo_errors; 155 unsigned long tx_heartbeat_errors; 156 unsigned long tx_window_errors; 157 158 /* for cslip etc */ 159 unsigned long rx_compressed; 160 unsigned long tx_compressed; 161 }; 162 163 164 /* Media selection options. */ 165 enum { 166 IF_PORT_UNKNOWN = 0, 167 IF_PORT_10BASE2, 168 IF_PORT_10BASET, 169 IF_PORT_AUI, 170 IF_PORT_100BASET, 171 IF_PORT_100BASETX, 172 IF_PORT_100BASEFX 173 }; 174 175 #ifdef __KERNEL__ 176 177 #include <linux/cache.h> 178 #include <linux/skbuff.h> 179 180 struct neighbour; 181 struct neigh_parms; 182 struct sk_buff; 183 184 struct netif_rx_stats 185 { 186 unsigned total; 187 unsigned dropped; 188 unsigned time_squeeze; 189 unsigned cpu_collision; 190 }; 191 192 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 193 194 struct dev_addr_list 195 { 196 struct dev_addr_list *next; 197 u8 da_addr[MAX_ADDR_LEN]; 198 u8 da_addrlen; 199 u8 da_synced; 200 int da_users; 201 int da_gusers; 202 }; 203 204 /* 205 * We tag multicasts with these structures. 206 */ 207 208 #define dev_mc_list dev_addr_list 209 #define dmi_addr da_addr 210 #define dmi_addrlen da_addrlen 211 #define dmi_users da_users 212 #define dmi_gusers da_gusers 213 214 struct netdev_hw_addr { 215 struct list_head list; 216 unsigned char addr[MAX_ADDR_LEN]; 217 unsigned char type; 218 #define NETDEV_HW_ADDR_T_LAN 1 219 #define NETDEV_HW_ADDR_T_SAN 2 220 #define NETDEV_HW_ADDR_T_SLAVE 3 221 #define NETDEV_HW_ADDR_T_UNICAST 4 222 int refcount; 223 bool synced; 224 struct rcu_head rcu_head; 225 }; 226 227 struct hh_cache 228 { 229 struct hh_cache *hh_next; /* Next entry */ 230 atomic_t hh_refcnt; /* number of users */ 231 /* 232 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 233 * cache line on SMP. 234 * They are mostly read, but hh_refcnt may be changed quite frequently, 235 * incurring cache line ping pongs. 236 */ 237 __be16 hh_type ____cacheline_aligned_in_smp; 238 /* protocol identifier, f.e ETH_P_IP 239 * NOTE: For VLANs, this will be the 240 * encapuslated type. --BLG 241 */ 242 u16 hh_len; /* length of header */ 243 int (*hh_output)(struct sk_buff *skb); 244 seqlock_t hh_lock; 245 246 /* cached hardware header; allow for machine alignment needs. */ 247 #define HH_DATA_MOD 16 248 #define HH_DATA_OFF(__len) \ 249 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 250 #define HH_DATA_ALIGN(__len) \ 251 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 252 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 253 }; 254 255 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 256 * Alternative is: 257 * dev->hard_header_len ? (dev->hard_header_len + 258 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 259 * 260 * We could use other alignment values, but we must maintain the 261 * relationship HH alignment <= LL alignment. 262 * 263 * LL_ALLOCATED_SPACE also takes into account the tailroom the device 264 * may need. 265 */ 266 #define LL_RESERVED_SPACE(dev) \ 267 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 268 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 269 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 270 #define LL_ALLOCATED_SPACE(dev) \ 271 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 272 273 struct header_ops { 274 int (*create) (struct sk_buff *skb, struct net_device *dev, 275 unsigned short type, const void *daddr, 276 const void *saddr, unsigned len); 277 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 278 int (*rebuild)(struct sk_buff *skb); 279 #define HAVE_HEADER_CACHE 280 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 281 void (*cache_update)(struct hh_cache *hh, 282 const struct net_device *dev, 283 const unsigned char *haddr); 284 }; 285 286 /* These flag bits are private to the generic network queueing 287 * layer, they may not be explicitly referenced by any other 288 * code. 289 */ 290 291 enum netdev_state_t 292 { 293 __LINK_STATE_START, 294 __LINK_STATE_PRESENT, 295 __LINK_STATE_NOCARRIER, 296 __LINK_STATE_LINKWATCH_PENDING, 297 __LINK_STATE_DORMANT, 298 }; 299 300 301 /* 302 * This structure holds at boot time configured netdevice settings. They 303 * are then used in the device probing. 304 */ 305 struct netdev_boot_setup { 306 char name[IFNAMSIZ]; 307 struct ifmap map; 308 }; 309 #define NETDEV_BOOT_SETUP_MAX 8 310 311 extern int __init netdev_boot_setup(char *str); 312 313 /* 314 * Structure for NAPI scheduling similar to tasklet but with weighting 315 */ 316 struct napi_struct { 317 /* The poll_list must only be managed by the entity which 318 * changes the state of the NAPI_STATE_SCHED bit. This means 319 * whoever atomically sets that bit can add this napi_struct 320 * to the per-cpu poll_list, and whoever clears that bit 321 * can remove from the list right before clearing the bit. 322 */ 323 struct list_head poll_list; 324 325 unsigned long state; 326 int weight; 327 int (*poll)(struct napi_struct *, int); 328 #ifdef CONFIG_NETPOLL 329 spinlock_t poll_lock; 330 int poll_owner; 331 #endif 332 333 unsigned int gro_count; 334 335 struct net_device *dev; 336 struct list_head dev_list; 337 struct sk_buff *gro_list; 338 struct sk_buff *skb; 339 }; 340 341 enum 342 { 343 NAPI_STATE_SCHED, /* Poll is scheduled */ 344 NAPI_STATE_DISABLE, /* Disable pending */ 345 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 346 }; 347 348 enum { 349 GRO_MERGED, 350 GRO_MERGED_FREE, 351 GRO_HELD, 352 GRO_NORMAL, 353 GRO_DROP, 354 }; 355 356 extern void __napi_schedule(struct napi_struct *n); 357 358 static inline int napi_disable_pending(struct napi_struct *n) 359 { 360 return test_bit(NAPI_STATE_DISABLE, &n->state); 361 } 362 363 /** 364 * napi_schedule_prep - check if napi can be scheduled 365 * @n: napi context 366 * 367 * Test if NAPI routine is already running, and if not mark 368 * it as running. This is used as a condition variable 369 * insure only one NAPI poll instance runs. We also make 370 * sure there is no pending NAPI disable. 371 */ 372 static inline int napi_schedule_prep(struct napi_struct *n) 373 { 374 return !napi_disable_pending(n) && 375 !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 376 } 377 378 /** 379 * napi_schedule - schedule NAPI poll 380 * @n: napi context 381 * 382 * Schedule NAPI poll routine to be called if it is not already 383 * running. 384 */ 385 static inline void napi_schedule(struct napi_struct *n) 386 { 387 if (napi_schedule_prep(n)) 388 __napi_schedule(n); 389 } 390 391 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 392 static inline int napi_reschedule(struct napi_struct *napi) 393 { 394 if (napi_schedule_prep(napi)) { 395 __napi_schedule(napi); 396 return 1; 397 } 398 return 0; 399 } 400 401 /** 402 * napi_complete - NAPI processing complete 403 * @n: napi context 404 * 405 * Mark NAPI processing as complete. 406 */ 407 extern void __napi_complete(struct napi_struct *n); 408 extern void napi_complete(struct napi_struct *n); 409 410 /** 411 * napi_disable - prevent NAPI from scheduling 412 * @n: napi context 413 * 414 * Stop NAPI from being scheduled on this context. 415 * Waits till any outstanding processing completes. 416 */ 417 static inline void napi_disable(struct napi_struct *n) 418 { 419 set_bit(NAPI_STATE_DISABLE, &n->state); 420 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 421 msleep(1); 422 clear_bit(NAPI_STATE_DISABLE, &n->state); 423 } 424 425 /** 426 * napi_enable - enable NAPI scheduling 427 * @n: napi context 428 * 429 * Resume NAPI from being scheduled on this context. 430 * Must be paired with napi_disable. 431 */ 432 static inline void napi_enable(struct napi_struct *n) 433 { 434 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 435 smp_mb__before_clear_bit(); 436 clear_bit(NAPI_STATE_SCHED, &n->state); 437 } 438 439 #ifdef CONFIG_SMP 440 /** 441 * napi_synchronize - wait until NAPI is not running 442 * @n: napi context 443 * 444 * Wait until NAPI is done being scheduled on this context. 445 * Waits till any outstanding processing completes but 446 * does not disable future activations. 447 */ 448 static inline void napi_synchronize(const struct napi_struct *n) 449 { 450 while (test_bit(NAPI_STATE_SCHED, &n->state)) 451 msleep(1); 452 } 453 #else 454 # define napi_synchronize(n) barrier() 455 #endif 456 457 enum netdev_queue_state_t 458 { 459 __QUEUE_STATE_XOFF, 460 __QUEUE_STATE_FROZEN, 461 }; 462 463 struct netdev_queue { 464 /* 465 * read mostly part 466 */ 467 struct net_device *dev; 468 struct Qdisc *qdisc; 469 unsigned long state; 470 struct Qdisc *qdisc_sleeping; 471 /* 472 * write mostly part 473 */ 474 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 475 int xmit_lock_owner; 476 /* 477 * please use this field instead of dev->trans_start 478 */ 479 unsigned long trans_start; 480 unsigned long tx_bytes; 481 unsigned long tx_packets; 482 unsigned long tx_dropped; 483 } ____cacheline_aligned_in_smp; 484 485 486 /* 487 * This structure defines the management hooks for network devices. 488 * The following hooks can be defined; unless noted otherwise, they are 489 * optional and can be filled with a null pointer. 490 * 491 * int (*ndo_init)(struct net_device *dev); 492 * This function is called once when network device is registered. 493 * The network device can use this to any late stage initializaton 494 * or semantic validattion. It can fail with an error code which will 495 * be propogated back to register_netdev 496 * 497 * void (*ndo_uninit)(struct net_device *dev); 498 * This function is called when device is unregistered or when registration 499 * fails. It is not called if init fails. 500 * 501 * int (*ndo_open)(struct net_device *dev); 502 * This function is called when network device transistions to the up 503 * state. 504 * 505 * int (*ndo_stop)(struct net_device *dev); 506 * This function is called when network device transistions to the down 507 * state. 508 * 509 * int (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev); 510 * Called when a packet needs to be transmitted. 511 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY, or NETDEV_TX_LOCKED, 512 * Required can not be NULL. 513 * 514 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb); 515 * Called to decide which queue to when device supports multiple 516 * transmit queues. 517 * 518 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 519 * This function is called to allow device receiver to make 520 * changes to configuration when multicast or promiscious is enabled. 521 * 522 * void (*ndo_set_rx_mode)(struct net_device *dev); 523 * This function is called device changes address list filtering. 524 * 525 * void (*ndo_set_multicast_list)(struct net_device *dev); 526 * This function is called when the multicast address list changes. 527 * 528 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 529 * This function is called when the Media Access Control address 530 * needs to be changed. If this interface is not defined, the 531 * mac address can not be changed. 532 * 533 * int (*ndo_validate_addr)(struct net_device *dev); 534 * Test if Media Access Control address is valid for the device. 535 * 536 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 537 * Called when a user request an ioctl which can't be handled by 538 * the generic interface code. If not defined ioctl's return 539 * not supported error code. 540 * 541 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 542 * Used to set network devices bus interface parameters. This interface 543 * is retained for legacy reason, new devices should use the bus 544 * interface (PCI) for low level management. 545 * 546 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 547 * Called when a user wants to change the Maximum Transfer Unit 548 * of a device. If not defined, any request to change MTU will 549 * will return an error. 550 * 551 * void (*ndo_tx_timeout)(struct net_device *dev); 552 * Callback uses when the transmitter has not made any progress 553 * for dev->watchdog ticks. 554 * 555 * struct net_device_stats* (*get_stats)(struct net_device *dev); 556 * Called when a user wants to get the network device usage 557 * statistics. If not defined, the counters in dev->stats will 558 * be used. 559 * 560 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp); 561 * If device support VLAN receive accleration 562 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called 563 * when vlan groups for the device changes. Note: grp is NULL 564 * if no vlan's groups are being used. 565 * 566 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid); 567 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 568 * this function is called when a VLAN id is registered. 569 * 570 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid); 571 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 572 * this function is called when a VLAN id is unregistered. 573 * 574 * void (*ndo_poll_controller)(struct net_device *dev); 575 */ 576 #define HAVE_NET_DEVICE_OPS 577 struct net_device_ops { 578 int (*ndo_init)(struct net_device *dev); 579 void (*ndo_uninit)(struct net_device *dev); 580 int (*ndo_open)(struct net_device *dev); 581 int (*ndo_stop)(struct net_device *dev); 582 int (*ndo_start_xmit) (struct sk_buff *skb, 583 struct net_device *dev); 584 u16 (*ndo_select_queue)(struct net_device *dev, 585 struct sk_buff *skb); 586 #define HAVE_CHANGE_RX_FLAGS 587 void (*ndo_change_rx_flags)(struct net_device *dev, 588 int flags); 589 #define HAVE_SET_RX_MODE 590 void (*ndo_set_rx_mode)(struct net_device *dev); 591 #define HAVE_MULTICAST 592 void (*ndo_set_multicast_list)(struct net_device *dev); 593 #define HAVE_SET_MAC_ADDR 594 int (*ndo_set_mac_address)(struct net_device *dev, 595 void *addr); 596 #define HAVE_VALIDATE_ADDR 597 int (*ndo_validate_addr)(struct net_device *dev); 598 #define HAVE_PRIVATE_IOCTL 599 int (*ndo_do_ioctl)(struct net_device *dev, 600 struct ifreq *ifr, int cmd); 601 #define HAVE_SET_CONFIG 602 int (*ndo_set_config)(struct net_device *dev, 603 struct ifmap *map); 604 #define HAVE_CHANGE_MTU 605 int (*ndo_change_mtu)(struct net_device *dev, 606 int new_mtu); 607 int (*ndo_neigh_setup)(struct net_device *dev, 608 struct neigh_parms *); 609 #define HAVE_TX_TIMEOUT 610 void (*ndo_tx_timeout) (struct net_device *dev); 611 612 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 613 614 void (*ndo_vlan_rx_register)(struct net_device *dev, 615 struct vlan_group *grp); 616 void (*ndo_vlan_rx_add_vid)(struct net_device *dev, 617 unsigned short vid); 618 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 619 unsigned short vid); 620 #ifdef CONFIG_NET_POLL_CONTROLLER 621 #define HAVE_NETDEV_POLL 622 void (*ndo_poll_controller)(struct net_device *dev); 623 #endif 624 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 625 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 626 u16 xid, 627 struct scatterlist *sgl, 628 unsigned int sgc); 629 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 630 u16 xid); 631 #endif 632 }; 633 634 /* 635 * The DEVICE structure. 636 * Actually, this whole structure is a big mistake. It mixes I/O 637 * data with strictly "high-level" data, and it has to know about 638 * almost every data structure used in the INET module. 639 * 640 * FIXME: cleanup struct net_device such that network protocol info 641 * moves out. 642 */ 643 644 struct net_device 645 { 646 647 /* 648 * This is the first field of the "visible" part of this structure 649 * (i.e. as seen by users in the "Space.c" file). It is the name 650 * the interface. 651 */ 652 char name[IFNAMSIZ]; 653 /* device name hash chain */ 654 struct hlist_node name_hlist; 655 /* snmp alias */ 656 char *ifalias; 657 658 /* 659 * I/O specific fields 660 * FIXME: Merge these and struct ifmap into one 661 */ 662 unsigned long mem_end; /* shared mem end */ 663 unsigned long mem_start; /* shared mem start */ 664 unsigned long base_addr; /* device I/O address */ 665 unsigned int irq; /* device IRQ number */ 666 667 /* 668 * Some hardware also needs these fields, but they are not 669 * part of the usual set specified in Space.c. 670 */ 671 672 unsigned char if_port; /* Selectable AUI, TP,..*/ 673 unsigned char dma; /* DMA channel */ 674 675 unsigned long state; 676 677 struct list_head dev_list; 678 struct list_head napi_list; 679 680 /* Net device features */ 681 unsigned long features; 682 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 683 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 684 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 685 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 686 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 687 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 688 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 689 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 690 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 691 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 692 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 693 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 694 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 695 /* do not use LLTX in new drivers */ 696 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 697 #define NETIF_F_GRO 16384 /* Generic receive offload */ 698 #define NETIF_F_LRO 32768 /* large receive offload */ 699 700 /* the GSO_MASK reserves bits 16 through 23 */ 701 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */ 702 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */ 703 704 /* Segmentation offload features */ 705 #define NETIF_F_GSO_SHIFT 16 706 #define NETIF_F_GSO_MASK 0x00ff0000 707 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 708 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 709 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 710 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 711 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 712 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT) 713 714 /* List of features with software fallbacks. */ 715 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 716 717 718 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 719 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 720 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 721 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 722 723 /* 724 * If one device supports one of these features, then enable them 725 * for all in netdev_increment_features. 726 */ 727 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \ 728 NETIF_F_SG | NETIF_F_HIGHDMA | \ 729 NETIF_F_FRAGLIST) 730 731 /* Interface index. Unique device identifier */ 732 int ifindex; 733 int iflink; 734 735 struct net_device_stats stats; 736 737 #ifdef CONFIG_WIRELESS_EXT 738 /* List of functions to handle Wireless Extensions (instead of ioctl). 739 * See <net/iw_handler.h> for details. Jean II */ 740 const struct iw_handler_def * wireless_handlers; 741 /* Instance data managed by the core of Wireless Extensions. */ 742 struct iw_public_data * wireless_data; 743 #endif 744 /* Management operations */ 745 const struct net_device_ops *netdev_ops; 746 const struct ethtool_ops *ethtool_ops; 747 748 /* Hardware header description */ 749 const struct header_ops *header_ops; 750 751 unsigned int flags; /* interface flags (a la BSD) */ 752 unsigned short gflags; 753 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 754 unsigned short padded; /* How much padding added by alloc_netdev() */ 755 756 unsigned char operstate; /* RFC2863 operstate */ 757 unsigned char link_mode; /* mapping policy to operstate */ 758 759 unsigned mtu; /* interface MTU value */ 760 unsigned short type; /* interface hardware type */ 761 unsigned short hard_header_len; /* hardware hdr length */ 762 763 /* extra head- and tailroom the hardware may need, but not in all cases 764 * can this be guaranteed, especially tailroom. Some cases also use 765 * LL_MAX_HEADER instead to allocate the skb. 766 */ 767 unsigned short needed_headroom; 768 unsigned short needed_tailroom; 769 770 struct net_device *master; /* Pointer to master device of a group, 771 * which this device is member of. 772 */ 773 774 /* Interface address info. */ 775 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 776 unsigned char addr_len; /* hardware address length */ 777 unsigned short dev_id; /* for shared network cards */ 778 779 struct list_head uc_list; /* Secondary unicast mac 780 addresses */ 781 int uc_count; /* Number of installed ucasts */ 782 int uc_promisc; 783 spinlock_t addr_list_lock; 784 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 785 int mc_count; /* Number of installed mcasts */ 786 unsigned int promiscuity; 787 unsigned int allmulti; 788 789 790 /* Protocol specific pointers */ 791 792 #ifdef CONFIG_NET_DSA 793 void *dsa_ptr; /* dsa specific data */ 794 #endif 795 void *atalk_ptr; /* AppleTalk link */ 796 void *ip_ptr; /* IPv4 specific data */ 797 void *dn_ptr; /* DECnet specific data */ 798 void *ip6_ptr; /* IPv6 specific data */ 799 void *ec_ptr; /* Econet specific data */ 800 void *ax25_ptr; /* AX.25 specific data */ 801 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 802 assign before registering */ 803 804 /* 805 * Cache line mostly used on receive path (including eth_type_trans()) 806 */ 807 unsigned long last_rx; /* Time of last Rx */ 808 /* Interface address info used in eth_type_trans() */ 809 unsigned char *dev_addr; /* hw address, (before bcast 810 because most packets are 811 unicast) */ 812 813 struct list_head dev_addr_list; /* list of device hw addresses */ 814 815 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 816 817 struct netdev_queue rx_queue; 818 819 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 820 821 /* Number of TX queues allocated at alloc_netdev_mq() time */ 822 unsigned int num_tx_queues; 823 824 /* Number of TX queues currently active in device */ 825 unsigned int real_num_tx_queues; 826 827 unsigned long tx_queue_len; /* Max frames per queue allowed */ 828 spinlock_t tx_global_lock; 829 /* 830 * One part is mostly used on xmit path (device) 831 */ 832 /* These may be needed for future network-power-down code. */ 833 834 /* 835 * trans_start here is expensive for high speed devices on SMP, 836 * please use netdev_queue->trans_start instead. 837 */ 838 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 839 840 int watchdog_timeo; /* used by dev_watchdog() */ 841 struct timer_list watchdog_timer; 842 843 /* Number of references to this device */ 844 atomic_t refcnt ____cacheline_aligned_in_smp; 845 846 /* delayed register/unregister */ 847 struct list_head todo_list; 848 /* device index hash chain */ 849 struct hlist_node index_hlist; 850 851 struct net_device *link_watch_next; 852 853 /* register/unregister state machine */ 854 enum { NETREG_UNINITIALIZED=0, 855 NETREG_REGISTERED, /* completed register_netdevice */ 856 NETREG_UNREGISTERING, /* called unregister_netdevice */ 857 NETREG_UNREGISTERED, /* completed unregister todo */ 858 NETREG_RELEASED, /* called free_netdev */ 859 NETREG_DUMMY, /* dummy device for NAPI poll */ 860 } reg_state; 861 862 /* Called from unregister, can be used to call free_netdev */ 863 void (*destructor)(struct net_device *dev); 864 865 #ifdef CONFIG_NETPOLL 866 struct netpoll_info *npinfo; 867 #endif 868 869 #ifdef CONFIG_NET_NS 870 /* Network namespace this network device is inside */ 871 struct net *nd_net; 872 #endif 873 874 /* mid-layer private */ 875 void *ml_priv; 876 877 /* bridge stuff */ 878 struct net_bridge_port *br_port; 879 /* macvlan */ 880 struct macvlan_port *macvlan_port; 881 /* GARP */ 882 struct garp_port *garp_port; 883 884 /* class/net/name entry */ 885 struct device dev; 886 /* space for optional statistics and wireless sysfs groups */ 887 struct attribute_group *sysfs_groups[3]; 888 889 /* rtnetlink link ops */ 890 const struct rtnl_link_ops *rtnl_link_ops; 891 892 /* VLAN feature mask */ 893 unsigned long vlan_features; 894 895 /* for setting kernel sock attribute on TCP connection setup */ 896 #define GSO_MAX_SIZE 65536 897 unsigned int gso_max_size; 898 899 #ifdef CONFIG_DCB 900 /* Data Center Bridging netlink ops */ 901 struct dcbnl_rtnl_ops *dcbnl_ops; 902 #endif 903 904 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 905 /* max exchange id for FCoE LRO by ddp */ 906 unsigned int fcoe_ddp_xid; 907 #endif 908 }; 909 #define to_net_dev(d) container_of(d, struct net_device, dev) 910 911 #define NETDEV_ALIGN 32 912 913 static inline 914 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 915 unsigned int index) 916 { 917 return &dev->_tx[index]; 918 } 919 920 static inline void netdev_for_each_tx_queue(struct net_device *dev, 921 void (*f)(struct net_device *, 922 struct netdev_queue *, 923 void *), 924 void *arg) 925 { 926 unsigned int i; 927 928 for (i = 0; i < dev->num_tx_queues; i++) 929 f(dev, &dev->_tx[i], arg); 930 } 931 932 /* 933 * Net namespace inlines 934 */ 935 static inline 936 struct net *dev_net(const struct net_device *dev) 937 { 938 #ifdef CONFIG_NET_NS 939 return dev->nd_net; 940 #else 941 return &init_net; 942 #endif 943 } 944 945 static inline 946 void dev_net_set(struct net_device *dev, struct net *net) 947 { 948 #ifdef CONFIG_NET_NS 949 release_net(dev->nd_net); 950 dev->nd_net = hold_net(net); 951 #endif 952 } 953 954 static inline bool netdev_uses_dsa_tags(struct net_device *dev) 955 { 956 #ifdef CONFIG_NET_DSA_TAG_DSA 957 if (dev->dsa_ptr != NULL) 958 return dsa_uses_dsa_tags(dev->dsa_ptr); 959 #endif 960 961 return 0; 962 } 963 964 static inline bool netdev_uses_trailer_tags(struct net_device *dev) 965 { 966 #ifdef CONFIG_NET_DSA_TAG_TRAILER 967 if (dev->dsa_ptr != NULL) 968 return dsa_uses_trailer_tags(dev->dsa_ptr); 969 #endif 970 971 return 0; 972 } 973 974 /** 975 * netdev_priv - access network device private data 976 * @dev: network device 977 * 978 * Get network device private data 979 */ 980 static inline void *netdev_priv(const struct net_device *dev) 981 { 982 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); 983 } 984 985 /* Set the sysfs physical device reference for the network logical device 986 * if set prior to registration will cause a symlink during initialization. 987 */ 988 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 989 990 /** 991 * netif_napi_add - initialize a napi context 992 * @dev: network device 993 * @napi: napi context 994 * @poll: polling function 995 * @weight: default weight 996 * 997 * netif_napi_add() must be used to initialize a napi context prior to calling 998 * *any* of the other napi related functions. 999 */ 1000 void netif_napi_add(struct net_device *dev, struct napi_struct *napi, 1001 int (*poll)(struct napi_struct *, int), int weight); 1002 1003 /** 1004 * netif_napi_del - remove a napi context 1005 * @napi: napi context 1006 * 1007 * netif_napi_del() removes a napi context from the network device napi list 1008 */ 1009 void netif_napi_del(struct napi_struct *napi); 1010 1011 struct napi_gro_cb { 1012 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */ 1013 void *frag0; 1014 1015 /* Length of frag0. */ 1016 unsigned int frag0_len; 1017 1018 /* This indicates where we are processing relative to skb->data. */ 1019 int data_offset; 1020 1021 /* This is non-zero if the packet may be of the same flow. */ 1022 int same_flow; 1023 1024 /* This is non-zero if the packet cannot be merged with the new skb. */ 1025 int flush; 1026 1027 /* Number of segments aggregated. */ 1028 int count; 1029 1030 /* Free the skb? */ 1031 int free; 1032 }; 1033 1034 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb) 1035 1036 struct packet_type { 1037 __be16 type; /* This is really htons(ether_type). */ 1038 struct net_device *dev; /* NULL is wildcarded here */ 1039 int (*func) (struct sk_buff *, 1040 struct net_device *, 1041 struct packet_type *, 1042 struct net_device *); 1043 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 1044 int features); 1045 int (*gso_send_check)(struct sk_buff *skb); 1046 struct sk_buff **(*gro_receive)(struct sk_buff **head, 1047 struct sk_buff *skb); 1048 int (*gro_complete)(struct sk_buff *skb); 1049 void *af_packet_priv; 1050 struct list_head list; 1051 }; 1052 1053 #include <linux/interrupt.h> 1054 #include <linux/notifier.h> 1055 1056 extern rwlock_t dev_base_lock; /* Device list lock */ 1057 1058 1059 #define for_each_netdev(net, d) \ 1060 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 1061 #define for_each_netdev_safe(net, d, n) \ 1062 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 1063 #define for_each_netdev_continue(net, d) \ 1064 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 1065 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 1066 1067 static inline struct net_device *next_net_device(struct net_device *dev) 1068 { 1069 struct list_head *lh; 1070 struct net *net; 1071 1072 net = dev_net(dev); 1073 lh = dev->dev_list.next; 1074 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 1075 } 1076 1077 static inline struct net_device *first_net_device(struct net *net) 1078 { 1079 return list_empty(&net->dev_base_head) ? NULL : 1080 net_device_entry(net->dev_base_head.next); 1081 } 1082 1083 extern int netdev_boot_setup_check(struct net_device *dev); 1084 extern unsigned long netdev_boot_base(const char *prefix, int unit); 1085 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 1086 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 1087 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 1088 extern void dev_add_pack(struct packet_type *pt); 1089 extern void dev_remove_pack(struct packet_type *pt); 1090 extern void __dev_remove_pack(struct packet_type *pt); 1091 1092 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 1093 unsigned short mask); 1094 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 1095 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 1096 extern int dev_alloc_name(struct net_device *dev, const char *name); 1097 extern int dev_open(struct net_device *dev); 1098 extern int dev_close(struct net_device *dev); 1099 extern void dev_disable_lro(struct net_device *dev); 1100 extern int dev_queue_xmit(struct sk_buff *skb); 1101 extern int register_netdevice(struct net_device *dev); 1102 extern void unregister_netdevice(struct net_device *dev); 1103 extern void free_netdev(struct net_device *dev); 1104 extern void synchronize_net(void); 1105 extern int register_netdevice_notifier(struct notifier_block *nb); 1106 extern int unregister_netdevice_notifier(struct notifier_block *nb); 1107 extern int init_dummy_netdev(struct net_device *dev); 1108 extern void netdev_resync_ops(struct net_device *dev); 1109 1110 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 1111 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 1112 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 1113 extern int dev_restart(struct net_device *dev); 1114 #ifdef CONFIG_NETPOLL_TRAP 1115 extern int netpoll_trap(void); 1116 #endif 1117 extern int skb_gro_receive(struct sk_buff **head, 1118 struct sk_buff *skb); 1119 extern void skb_gro_reset_offset(struct sk_buff *skb); 1120 1121 static inline unsigned int skb_gro_offset(const struct sk_buff *skb) 1122 { 1123 return NAPI_GRO_CB(skb)->data_offset; 1124 } 1125 1126 static inline unsigned int skb_gro_len(const struct sk_buff *skb) 1127 { 1128 return skb->len - NAPI_GRO_CB(skb)->data_offset; 1129 } 1130 1131 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len) 1132 { 1133 NAPI_GRO_CB(skb)->data_offset += len; 1134 } 1135 1136 static inline void *skb_gro_header_fast(struct sk_buff *skb, 1137 unsigned int offset) 1138 { 1139 return NAPI_GRO_CB(skb)->frag0 + offset; 1140 } 1141 1142 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen) 1143 { 1144 return NAPI_GRO_CB(skb)->frag0_len < hlen; 1145 } 1146 1147 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen, 1148 unsigned int offset) 1149 { 1150 NAPI_GRO_CB(skb)->frag0 = NULL; 1151 NAPI_GRO_CB(skb)->frag0_len = 0; 1152 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL; 1153 } 1154 1155 static inline void *skb_gro_mac_header(struct sk_buff *skb) 1156 { 1157 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb); 1158 } 1159 1160 static inline void *skb_gro_network_header(struct sk_buff *skb) 1161 { 1162 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + 1163 skb_network_offset(skb); 1164 } 1165 1166 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 1167 unsigned short type, 1168 const void *daddr, const void *saddr, 1169 unsigned len) 1170 { 1171 if (!dev->header_ops || !dev->header_ops->create) 1172 return 0; 1173 1174 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 1175 } 1176 1177 static inline int dev_parse_header(const struct sk_buff *skb, 1178 unsigned char *haddr) 1179 { 1180 const struct net_device *dev = skb->dev; 1181 1182 if (!dev->header_ops || !dev->header_ops->parse) 1183 return 0; 1184 return dev->header_ops->parse(skb, haddr); 1185 } 1186 1187 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 1188 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 1189 static inline int unregister_gifconf(unsigned int family) 1190 { 1191 return register_gifconf(family, NULL); 1192 } 1193 1194 /* 1195 * Incoming packets are placed on per-cpu queues so that 1196 * no locking is needed. 1197 */ 1198 struct softnet_data 1199 { 1200 struct Qdisc *output_queue; 1201 struct sk_buff_head input_pkt_queue; 1202 struct list_head poll_list; 1203 struct sk_buff *completion_queue; 1204 1205 struct napi_struct backlog; 1206 }; 1207 1208 DECLARE_PER_CPU(struct softnet_data,softnet_data); 1209 1210 #define HAVE_NETIF_QUEUE 1211 1212 extern void __netif_schedule(struct Qdisc *q); 1213 1214 static inline void netif_schedule_queue(struct netdev_queue *txq) 1215 { 1216 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1217 __netif_schedule(txq->qdisc); 1218 } 1219 1220 static inline void netif_tx_schedule_all(struct net_device *dev) 1221 { 1222 unsigned int i; 1223 1224 for (i = 0; i < dev->num_tx_queues; i++) 1225 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1226 } 1227 1228 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1229 { 1230 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1231 } 1232 1233 /** 1234 * netif_start_queue - allow transmit 1235 * @dev: network device 1236 * 1237 * Allow upper layers to call the device hard_start_xmit routine. 1238 */ 1239 static inline void netif_start_queue(struct net_device *dev) 1240 { 1241 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1242 } 1243 1244 static inline void netif_tx_start_all_queues(struct net_device *dev) 1245 { 1246 unsigned int i; 1247 1248 for (i = 0; i < dev->num_tx_queues; i++) { 1249 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1250 netif_tx_start_queue(txq); 1251 } 1252 } 1253 1254 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1255 { 1256 #ifdef CONFIG_NETPOLL_TRAP 1257 if (netpoll_trap()) { 1258 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1259 return; 1260 } 1261 #endif 1262 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1263 __netif_schedule(dev_queue->qdisc); 1264 } 1265 1266 /** 1267 * netif_wake_queue - restart transmit 1268 * @dev: network device 1269 * 1270 * Allow upper layers to call the device hard_start_xmit routine. 1271 * Used for flow control when transmit resources are available. 1272 */ 1273 static inline void netif_wake_queue(struct net_device *dev) 1274 { 1275 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1276 } 1277 1278 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1279 { 1280 unsigned int i; 1281 1282 for (i = 0; i < dev->num_tx_queues; i++) { 1283 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1284 netif_tx_wake_queue(txq); 1285 } 1286 } 1287 1288 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1289 { 1290 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1291 } 1292 1293 /** 1294 * netif_stop_queue - stop transmitted packets 1295 * @dev: network device 1296 * 1297 * Stop upper layers calling the device hard_start_xmit routine. 1298 * Used for flow control when transmit resources are unavailable. 1299 */ 1300 static inline void netif_stop_queue(struct net_device *dev) 1301 { 1302 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1303 } 1304 1305 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1306 { 1307 unsigned int i; 1308 1309 for (i = 0; i < dev->num_tx_queues; i++) { 1310 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1311 netif_tx_stop_queue(txq); 1312 } 1313 } 1314 1315 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1316 { 1317 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1318 } 1319 1320 /** 1321 * netif_queue_stopped - test if transmit queue is flowblocked 1322 * @dev: network device 1323 * 1324 * Test if transmit queue on device is currently unable to send. 1325 */ 1326 static inline int netif_queue_stopped(const struct net_device *dev) 1327 { 1328 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1329 } 1330 1331 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1332 { 1333 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1334 } 1335 1336 /** 1337 * netif_running - test if up 1338 * @dev: network device 1339 * 1340 * Test if the device has been brought up. 1341 */ 1342 static inline int netif_running(const struct net_device *dev) 1343 { 1344 return test_bit(__LINK_STATE_START, &dev->state); 1345 } 1346 1347 /* 1348 * Routines to manage the subqueues on a device. We only need start 1349 * stop, and a check if it's stopped. All other device management is 1350 * done at the overall netdevice level. 1351 * Also test the device if we're multiqueue. 1352 */ 1353 1354 /** 1355 * netif_start_subqueue - allow sending packets on subqueue 1356 * @dev: network device 1357 * @queue_index: sub queue index 1358 * 1359 * Start individual transmit queue of a device with multiple transmit queues. 1360 */ 1361 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1362 { 1363 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1364 clear_bit(__QUEUE_STATE_XOFF, &txq->state); 1365 } 1366 1367 /** 1368 * netif_stop_subqueue - stop sending packets on subqueue 1369 * @dev: network device 1370 * @queue_index: sub queue index 1371 * 1372 * Stop individual transmit queue of a device with multiple transmit queues. 1373 */ 1374 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1375 { 1376 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1377 #ifdef CONFIG_NETPOLL_TRAP 1378 if (netpoll_trap()) 1379 return; 1380 #endif 1381 set_bit(__QUEUE_STATE_XOFF, &txq->state); 1382 } 1383 1384 /** 1385 * netif_subqueue_stopped - test status of subqueue 1386 * @dev: network device 1387 * @queue_index: sub queue index 1388 * 1389 * Check individual transmit queue of a device with multiple transmit queues. 1390 */ 1391 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1392 u16 queue_index) 1393 { 1394 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1395 return test_bit(__QUEUE_STATE_XOFF, &txq->state); 1396 } 1397 1398 static inline int netif_subqueue_stopped(const struct net_device *dev, 1399 struct sk_buff *skb) 1400 { 1401 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1402 } 1403 1404 /** 1405 * netif_wake_subqueue - allow sending packets on subqueue 1406 * @dev: network device 1407 * @queue_index: sub queue index 1408 * 1409 * Resume individual transmit queue of a device with multiple transmit queues. 1410 */ 1411 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1412 { 1413 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1414 #ifdef CONFIG_NETPOLL_TRAP 1415 if (netpoll_trap()) 1416 return; 1417 #endif 1418 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1419 __netif_schedule(txq->qdisc); 1420 } 1421 1422 /** 1423 * netif_is_multiqueue - test if device has multiple transmit queues 1424 * @dev: network device 1425 * 1426 * Check if device has multiple transmit queues 1427 */ 1428 static inline int netif_is_multiqueue(const struct net_device *dev) 1429 { 1430 return (dev->num_tx_queues > 1); 1431 } 1432 1433 /* Use this variant when it is known for sure that it 1434 * is executing from hardware interrupt context or with hardware interrupts 1435 * disabled. 1436 */ 1437 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1438 1439 /* Use this variant in places where it could be invoked 1440 * from either hardware interrupt or other context, with hardware interrupts 1441 * either disabled or enabled. 1442 */ 1443 extern void dev_kfree_skb_any(struct sk_buff *skb); 1444 1445 #define HAVE_NETIF_RX 1 1446 extern int netif_rx(struct sk_buff *skb); 1447 extern int netif_rx_ni(struct sk_buff *skb); 1448 #define HAVE_NETIF_RECEIVE_SKB 1 1449 extern int netif_receive_skb(struct sk_buff *skb); 1450 extern void napi_gro_flush(struct napi_struct *napi); 1451 extern int dev_gro_receive(struct napi_struct *napi, 1452 struct sk_buff *skb); 1453 extern int napi_skb_finish(int ret, struct sk_buff *skb); 1454 extern int napi_gro_receive(struct napi_struct *napi, 1455 struct sk_buff *skb); 1456 extern void napi_reuse_skb(struct napi_struct *napi, 1457 struct sk_buff *skb); 1458 extern struct sk_buff * napi_get_frags(struct napi_struct *napi); 1459 extern int napi_frags_finish(struct napi_struct *napi, 1460 struct sk_buff *skb, int ret); 1461 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi); 1462 extern int napi_gro_frags(struct napi_struct *napi); 1463 1464 static inline void napi_free_frags(struct napi_struct *napi) 1465 { 1466 kfree_skb(napi->skb); 1467 napi->skb = NULL; 1468 } 1469 1470 extern void netif_nit_deliver(struct sk_buff *skb); 1471 extern int dev_valid_name(const char *name); 1472 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1473 extern int dev_ethtool(struct net *net, struct ifreq *); 1474 extern unsigned dev_get_flags(const struct net_device *); 1475 extern int dev_change_flags(struct net_device *, unsigned); 1476 extern int dev_change_name(struct net_device *, const char *); 1477 extern int dev_set_alias(struct net_device *, const char *, size_t); 1478 extern int dev_change_net_namespace(struct net_device *, 1479 struct net *, const char *); 1480 extern int dev_set_mtu(struct net_device *, int); 1481 extern int dev_set_mac_address(struct net_device *, 1482 struct sockaddr *); 1483 extern int dev_hard_start_xmit(struct sk_buff *skb, 1484 struct net_device *dev, 1485 struct netdev_queue *txq); 1486 1487 extern int netdev_budget; 1488 1489 /* Called by rtnetlink.c:rtnl_unlock() */ 1490 extern void netdev_run_todo(void); 1491 1492 /** 1493 * dev_put - release reference to device 1494 * @dev: network device 1495 * 1496 * Release reference to device to allow it to be freed. 1497 */ 1498 static inline void dev_put(struct net_device *dev) 1499 { 1500 atomic_dec(&dev->refcnt); 1501 } 1502 1503 /** 1504 * dev_hold - get reference to device 1505 * @dev: network device 1506 * 1507 * Hold reference to device to keep it from being freed. 1508 */ 1509 static inline void dev_hold(struct net_device *dev) 1510 { 1511 atomic_inc(&dev->refcnt); 1512 } 1513 1514 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1515 * and _off may be called from IRQ context, but it is caller 1516 * who is responsible for serialization of these calls. 1517 * 1518 * The name carrier is inappropriate, these functions should really be 1519 * called netif_lowerlayer_*() because they represent the state of any 1520 * kind of lower layer not just hardware media. 1521 */ 1522 1523 extern void linkwatch_fire_event(struct net_device *dev); 1524 1525 /** 1526 * netif_carrier_ok - test if carrier present 1527 * @dev: network device 1528 * 1529 * Check if carrier is present on device 1530 */ 1531 static inline int netif_carrier_ok(const struct net_device *dev) 1532 { 1533 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1534 } 1535 1536 extern unsigned long dev_trans_start(struct net_device *dev); 1537 1538 extern void __netdev_watchdog_up(struct net_device *dev); 1539 1540 extern void netif_carrier_on(struct net_device *dev); 1541 1542 extern void netif_carrier_off(struct net_device *dev); 1543 1544 /** 1545 * netif_dormant_on - mark device as dormant. 1546 * @dev: network device 1547 * 1548 * Mark device as dormant (as per RFC2863). 1549 * 1550 * The dormant state indicates that the relevant interface is not 1551 * actually in a condition to pass packets (i.e., it is not 'up') but is 1552 * in a "pending" state, waiting for some external event. For "on- 1553 * demand" interfaces, this new state identifies the situation where the 1554 * interface is waiting for events to place it in the up state. 1555 * 1556 */ 1557 static inline void netif_dormant_on(struct net_device *dev) 1558 { 1559 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1560 linkwatch_fire_event(dev); 1561 } 1562 1563 /** 1564 * netif_dormant_off - set device as not dormant. 1565 * @dev: network device 1566 * 1567 * Device is not in dormant state. 1568 */ 1569 static inline void netif_dormant_off(struct net_device *dev) 1570 { 1571 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1572 linkwatch_fire_event(dev); 1573 } 1574 1575 /** 1576 * netif_dormant - test if carrier present 1577 * @dev: network device 1578 * 1579 * Check if carrier is present on device 1580 */ 1581 static inline int netif_dormant(const struct net_device *dev) 1582 { 1583 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1584 } 1585 1586 1587 /** 1588 * netif_oper_up - test if device is operational 1589 * @dev: network device 1590 * 1591 * Check if carrier is operational 1592 */ 1593 static inline int netif_oper_up(const struct net_device *dev) { 1594 return (dev->operstate == IF_OPER_UP || 1595 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1596 } 1597 1598 /** 1599 * netif_device_present - is device available or removed 1600 * @dev: network device 1601 * 1602 * Check if device has not been removed from system. 1603 */ 1604 static inline int netif_device_present(struct net_device *dev) 1605 { 1606 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1607 } 1608 1609 extern void netif_device_detach(struct net_device *dev); 1610 1611 extern void netif_device_attach(struct net_device *dev); 1612 1613 /* 1614 * Network interface message level settings 1615 */ 1616 #define HAVE_NETIF_MSG 1 1617 1618 enum { 1619 NETIF_MSG_DRV = 0x0001, 1620 NETIF_MSG_PROBE = 0x0002, 1621 NETIF_MSG_LINK = 0x0004, 1622 NETIF_MSG_TIMER = 0x0008, 1623 NETIF_MSG_IFDOWN = 0x0010, 1624 NETIF_MSG_IFUP = 0x0020, 1625 NETIF_MSG_RX_ERR = 0x0040, 1626 NETIF_MSG_TX_ERR = 0x0080, 1627 NETIF_MSG_TX_QUEUED = 0x0100, 1628 NETIF_MSG_INTR = 0x0200, 1629 NETIF_MSG_TX_DONE = 0x0400, 1630 NETIF_MSG_RX_STATUS = 0x0800, 1631 NETIF_MSG_PKTDATA = 0x1000, 1632 NETIF_MSG_HW = 0x2000, 1633 NETIF_MSG_WOL = 0x4000, 1634 }; 1635 1636 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1637 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1638 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1639 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1640 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1641 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1642 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1643 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1644 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1645 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1646 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1647 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1648 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1649 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1650 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1651 1652 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1653 { 1654 /* use default */ 1655 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1656 return default_msg_enable_bits; 1657 if (debug_value == 0) /* no output */ 1658 return 0; 1659 /* set low N bits */ 1660 return (1 << debug_value) - 1; 1661 } 1662 1663 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1664 { 1665 spin_lock(&txq->_xmit_lock); 1666 txq->xmit_lock_owner = cpu; 1667 } 1668 1669 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1670 { 1671 spin_lock_bh(&txq->_xmit_lock); 1672 txq->xmit_lock_owner = smp_processor_id(); 1673 } 1674 1675 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1676 { 1677 int ok = spin_trylock(&txq->_xmit_lock); 1678 if (likely(ok)) 1679 txq->xmit_lock_owner = smp_processor_id(); 1680 return ok; 1681 } 1682 1683 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1684 { 1685 txq->xmit_lock_owner = -1; 1686 spin_unlock(&txq->_xmit_lock); 1687 } 1688 1689 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1690 { 1691 txq->xmit_lock_owner = -1; 1692 spin_unlock_bh(&txq->_xmit_lock); 1693 } 1694 1695 static inline void txq_trans_update(struct netdev_queue *txq) 1696 { 1697 if (txq->xmit_lock_owner != -1) 1698 txq->trans_start = jiffies; 1699 } 1700 1701 /** 1702 * netif_tx_lock - grab network device transmit lock 1703 * @dev: network device 1704 * 1705 * Get network device transmit lock 1706 */ 1707 static inline void netif_tx_lock(struct net_device *dev) 1708 { 1709 unsigned int i; 1710 int cpu; 1711 1712 spin_lock(&dev->tx_global_lock); 1713 cpu = smp_processor_id(); 1714 for (i = 0; i < dev->num_tx_queues; i++) { 1715 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1716 1717 /* We are the only thread of execution doing a 1718 * freeze, but we have to grab the _xmit_lock in 1719 * order to synchronize with threads which are in 1720 * the ->hard_start_xmit() handler and already 1721 * checked the frozen bit. 1722 */ 1723 __netif_tx_lock(txq, cpu); 1724 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 1725 __netif_tx_unlock(txq); 1726 } 1727 } 1728 1729 static inline void netif_tx_lock_bh(struct net_device *dev) 1730 { 1731 local_bh_disable(); 1732 netif_tx_lock(dev); 1733 } 1734 1735 static inline void netif_tx_unlock(struct net_device *dev) 1736 { 1737 unsigned int i; 1738 1739 for (i = 0; i < dev->num_tx_queues; i++) { 1740 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1741 1742 /* No need to grab the _xmit_lock here. If the 1743 * queue is not stopped for another reason, we 1744 * force a schedule. 1745 */ 1746 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 1747 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1748 __netif_schedule(txq->qdisc); 1749 } 1750 spin_unlock(&dev->tx_global_lock); 1751 } 1752 1753 static inline void netif_tx_unlock_bh(struct net_device *dev) 1754 { 1755 netif_tx_unlock(dev); 1756 local_bh_enable(); 1757 } 1758 1759 #define HARD_TX_LOCK(dev, txq, cpu) { \ 1760 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1761 __netif_tx_lock(txq, cpu); \ 1762 } \ 1763 } 1764 1765 #define HARD_TX_UNLOCK(dev, txq) { \ 1766 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1767 __netif_tx_unlock(txq); \ 1768 } \ 1769 } 1770 1771 static inline void netif_tx_disable(struct net_device *dev) 1772 { 1773 unsigned int i; 1774 int cpu; 1775 1776 local_bh_disable(); 1777 cpu = smp_processor_id(); 1778 for (i = 0; i < dev->num_tx_queues; i++) { 1779 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1780 1781 __netif_tx_lock(txq, cpu); 1782 netif_tx_stop_queue(txq); 1783 __netif_tx_unlock(txq); 1784 } 1785 local_bh_enable(); 1786 } 1787 1788 static inline void netif_addr_lock(struct net_device *dev) 1789 { 1790 spin_lock(&dev->addr_list_lock); 1791 } 1792 1793 static inline void netif_addr_lock_bh(struct net_device *dev) 1794 { 1795 spin_lock_bh(&dev->addr_list_lock); 1796 } 1797 1798 static inline void netif_addr_unlock(struct net_device *dev) 1799 { 1800 spin_unlock(&dev->addr_list_lock); 1801 } 1802 1803 static inline void netif_addr_unlock_bh(struct net_device *dev) 1804 { 1805 spin_unlock_bh(&dev->addr_list_lock); 1806 } 1807 1808 /* 1809 * dev_addr_list walker. Should be used only for read access. Call with 1810 * rcu_read_lock held. 1811 */ 1812 #define for_each_dev_addr(dev, ha) \ 1813 list_for_each_entry_rcu(ha, &dev->dev_addr_list, list) 1814 1815 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1816 1817 extern void ether_setup(struct net_device *dev); 1818 1819 /* Support for loadable net-drivers */ 1820 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1821 void (*setup)(struct net_device *), 1822 unsigned int queue_count); 1823 #define alloc_netdev(sizeof_priv, name, setup) \ 1824 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1825 extern int register_netdev(struct net_device *dev); 1826 extern void unregister_netdev(struct net_device *dev); 1827 1828 /* Functions used for device addresses handling */ 1829 extern int dev_addr_add(struct net_device *dev, unsigned char *addr, 1830 unsigned char addr_type); 1831 extern int dev_addr_del(struct net_device *dev, unsigned char *addr, 1832 unsigned char addr_type); 1833 extern int dev_addr_add_multiple(struct net_device *to_dev, 1834 struct net_device *from_dev, 1835 unsigned char addr_type); 1836 extern int dev_addr_del_multiple(struct net_device *to_dev, 1837 struct net_device *from_dev, 1838 unsigned char addr_type); 1839 1840 /* Functions used for secondary unicast and multicast support */ 1841 extern void dev_set_rx_mode(struct net_device *dev); 1842 extern void __dev_set_rx_mode(struct net_device *dev); 1843 extern int dev_unicast_delete(struct net_device *dev, void *addr); 1844 extern int dev_unicast_add(struct net_device *dev, void *addr); 1845 extern int dev_unicast_sync(struct net_device *to, struct net_device *from); 1846 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); 1847 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1848 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1849 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1850 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1851 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1852 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1853 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1854 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1855 extern int dev_set_promiscuity(struct net_device *dev, int inc); 1856 extern int dev_set_allmulti(struct net_device *dev, int inc); 1857 extern void netdev_state_change(struct net_device *dev); 1858 extern void netdev_bonding_change(struct net_device *dev); 1859 extern void netdev_features_change(struct net_device *dev); 1860 /* Load a device via the kmod */ 1861 extern void dev_load(struct net *net, const char *name); 1862 extern void dev_mcast_init(void); 1863 extern const struct net_device_stats *dev_get_stats(struct net_device *dev); 1864 1865 extern int netdev_max_backlog; 1866 extern int weight_p; 1867 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1868 extern int skb_checksum_help(struct sk_buff *skb); 1869 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1870 #ifdef CONFIG_BUG 1871 extern void netdev_rx_csum_fault(struct net_device *dev); 1872 #else 1873 static inline void netdev_rx_csum_fault(struct net_device *dev) 1874 { 1875 } 1876 #endif 1877 /* rx skb timestamps */ 1878 extern void net_enable_timestamp(void); 1879 extern void net_disable_timestamp(void); 1880 1881 #ifdef CONFIG_PROC_FS 1882 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1883 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1884 extern void dev_seq_stop(struct seq_file *seq, void *v); 1885 #endif 1886 1887 extern int netdev_class_create_file(struct class_attribute *class_attr); 1888 extern void netdev_class_remove_file(struct class_attribute *class_attr); 1889 1890 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 1891 1892 extern void linkwatch_run_queue(void); 1893 1894 unsigned long netdev_increment_features(unsigned long all, unsigned long one, 1895 unsigned long mask); 1896 unsigned long netdev_fix_features(unsigned long features, const char *name); 1897 1898 static inline int net_gso_ok(int features, int gso_type) 1899 { 1900 int feature = gso_type << NETIF_F_GSO_SHIFT; 1901 return (features & feature) == feature; 1902 } 1903 1904 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1905 { 1906 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 1907 (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST)); 1908 } 1909 1910 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1911 { 1912 return skb_is_gso(skb) && 1913 (!skb_gso_ok(skb, dev->features) || 1914 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1915 } 1916 1917 static inline void netif_set_gso_max_size(struct net_device *dev, 1918 unsigned int size) 1919 { 1920 dev->gso_max_size = size; 1921 } 1922 1923 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb, 1924 struct net_device *master) 1925 { 1926 if (skb->pkt_type == PACKET_HOST) { 1927 u16 *dest = (u16 *) eth_hdr(skb)->h_dest; 1928 1929 memcpy(dest, master->dev_addr, ETH_ALEN); 1930 } 1931 } 1932 1933 /* On bonding slaves other than the currently active slave, suppress 1934 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1935 * ARP on active-backup slaves with arp_validate enabled. 1936 */ 1937 static inline int skb_bond_should_drop(struct sk_buff *skb) 1938 { 1939 struct net_device *dev = skb->dev; 1940 struct net_device *master = dev->master; 1941 1942 if (master) { 1943 if (master->priv_flags & IFF_MASTER_ARPMON) 1944 dev->last_rx = jiffies; 1945 1946 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) { 1947 /* Do address unmangle. The local destination address 1948 * will be always the one master has. Provides the right 1949 * functionality in a bridge. 1950 */ 1951 skb_bond_set_mac_by_master(skb, master); 1952 } 1953 1954 if (dev->priv_flags & IFF_SLAVE_INACTIVE) { 1955 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1956 skb->protocol == __cpu_to_be16(ETH_P_ARP)) 1957 return 0; 1958 1959 if (master->priv_flags & IFF_MASTER_ALB) { 1960 if (skb->pkt_type != PACKET_BROADCAST && 1961 skb->pkt_type != PACKET_MULTICAST) 1962 return 0; 1963 } 1964 if (master->priv_flags & IFF_MASTER_8023AD && 1965 skb->protocol == __cpu_to_be16(ETH_P_SLOW)) 1966 return 0; 1967 1968 return 1; 1969 } 1970 } 1971 return 0; 1972 } 1973 1974 extern struct pernet_operations __net_initdata loopback_net_ops; 1975 1976 static inline int dev_ethtool_get_settings(struct net_device *dev, 1977 struct ethtool_cmd *cmd) 1978 { 1979 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings) 1980 return -EOPNOTSUPP; 1981 return dev->ethtool_ops->get_settings(dev, cmd); 1982 } 1983 1984 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev) 1985 { 1986 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum) 1987 return 0; 1988 return dev->ethtool_ops->get_rx_csum(dev); 1989 } 1990 1991 static inline u32 dev_ethtool_get_flags(struct net_device *dev) 1992 { 1993 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags) 1994 return 0; 1995 return dev->ethtool_ops->get_flags(dev); 1996 } 1997 #endif /* __KERNEL__ */ 1998 1999 #endif /* _LINUX_NETDEVICE_H */ 2000