include/net/bonding.h

   1 /*
   2  * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
   3  *
   4  * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
   5  * NCM: Network and Communications Management, Inc.
   6  *
   7  * BUT, I'm the one who modified it for ethernet, so:
   8  * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
   9  *
  10  *      This software may be used and distributed according to the terms
  11  *      of the GNU Public License, incorporated herein by reference.
  12  *
  13  */
  14
  15 #ifndef _NET_BONDING_H
  16 #define _NET_BONDING_H
  17
  18 #include <linux/timer.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/if_bonding.h>
  21 #include <linux/cpumask.h>
  22 #include <linux/in6.h>
  23 #include <linux/netpoll.h>
  24 #include <linux/inetdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/reciprocal_div.h>
  27 #include <linux/if_link.h>
  28
  29 #include <net/bond_3ad.h>
  30 #include <net/bond_alb.h>
  31 #include <net/bond_options.h>
  32
  33 #define DRV_VERSION     "3.7.1"
  34 #define DRV_RELDATE     "April 27, 2011"
  35 #define DRV_NAME        "bonding"
  36 #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
  37
  38 #define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
  39
  40 #define BOND_MAX_ARP_TARGETS    16
  41
  42 #define BOND_DEFAULT_MIIMON     100
  43
  44 /*
  45  * Less bad way to call ioctl from within the kernel; this needs to be
  46  * done some other way to get the call out of interrupt context.
  47  * Needs "ioctl" variable to be supplied by calling context.
  48  */
  49 #define IOCTL(dev, arg, cmd) ({         \
  50         int res = 0;                    \
  51         mm_segment_t fs = get_fs();     \
  52         set_fs(get_ds());               \
  53         res = ioctl(dev, arg, cmd);     \
  54         set_fs(fs);                     \
  55         res; })
  56
  57 #define BOND_MODE(bond) ((bond)->params.mode)
  58
  59 /* slave list primitives */
  60 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
  61
  62 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
  63
  64 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
  65 #define bond_first_slave(bond) \
  66         (bond_has_slaves(bond) ? \
  67                 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
  68                 NULL)
  69 #define bond_last_slave(bond) \
  70         (bond_has_slaves(bond) ? \
  71                 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
  72                 NULL)
  73
  74 /* Caller must have rcu_read_lock */
  75 #define bond_first_slave_rcu(bond) \
  76         netdev_lower_get_first_private_rcu(bond->dev)
  77
  78 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
  79 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
  80
  81 /**
  82  * bond_for_each_slave - iterate over all slaves
  83  * @bond:       the bond holding this list
  84  * @pos:        current slave
  85  * @iter:       list_head * iterator
  86  *
  87  * Caller must hold RTNL
  88  */
  89 #define bond_for_each_slave(bond, pos, iter) \
  90         netdev_for_each_lower_private((bond)->dev, pos, iter)
  91
  92 /* Caller must have rcu_read_lock */
  93 #define bond_for_each_slave_rcu(bond, pos, iter) \
  94         netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
  95
  96 #ifdef CONFIG_NET_POLL_CONTROLLER
  97 extern atomic_t netpoll_block_tx;
  98
  99 static inline void block_netpoll_tx(void)
 100 {
 101         atomic_inc(&netpoll_block_tx);
 102 }
 103
 104 static inline void unblock_netpoll_tx(void)
 105 {
 106         atomic_dec(&netpoll_block_tx);
 107 }
 108
 109 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 110 {
 111         if (unlikely(netpoll_tx_running(dev)))
 112                 return atomic_read(&netpoll_block_tx);
 113         return 0;
 114 }
 115 #else
 116 #define block_netpoll_tx()
 117 #define unblock_netpoll_tx()
 118 #define is_netpoll_tx_blocked(dev) (0)
 119 #endif
 120
 121 struct bond_params {
 122         int mode;
 123         int xmit_policy;
 124         int miimon;
 125         u8 num_peer_notif;
 126         int arp_interval;
 127         int arp_validate;
 128         int arp_all_targets;
 129         int use_carrier;
 130         int fail_over_mac;
 131         int updelay;
 132         int downdelay;
 133         int lacp_fast;
 134         unsigned int min_links;
 135         int ad_select;
 136         char primary[IFNAMSIZ];
 137         int primary_reselect;
 138         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 139         int tx_queues;
 140         int all_slaves_active;
 141         int resend_igmp;
 142         int lp_interval;
 143         int packets_per_slave;
 144         int tlb_dynamic_lb;
 145         struct reciprocal_value reciprocal_packets_per_slave;
 146 };
 147
 148 struct bond_parm_tbl {
 149         char *modename;
 150         int mode;
 151 };
 152
 153 struct slave {
 154         struct net_device *dev; /* first - useful for panic debug */
 155         struct bonding *bond; /* our master */
 156         int    delay;
 157         /* all three in jiffies */
 158         unsigned long last_link_up;
 159         unsigned long last_rx;
 160         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 161         s8     link;    /* one of BOND_LINK_XXXX */
 162         s8     new_link;
 163         u8     backup:1,   /* indicates backup slave. Value corresponds with
 164                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 165                inactive:1, /* indicates inactive slave */
 166                should_notify:1; /* indicateds whether the state changed */
 167         u8     duplex;
 168         u32    original_mtu;
 169         u32    link_failure_count;
 170         u32    speed;
 171         u16    queue_id;
 172         u8     perm_hwaddr[ETH_ALEN];
 173         struct ad_slave_info *ad_info;
 174         struct tlb_slave_info tlb_info;
 175 #ifdef CONFIG_NET_POLL_CONTROLLER
 176         struct netpoll *np;
 177 #endif
 178         struct kobject kobj;
 179         struct rtnl_link_stats64 slave_stats;
 180 };
 181
 182 struct bond_up_slave {
 183         unsigned int    count;
 184         struct rcu_head rcu;
 185         struct slave    *arr[0];
 186 };
 187
 188 /*
 189  * Link pseudo-state only used internally by monitors
 190  */
 191 #define BOND_LINK_NOCHANGE -1
 192
 193 /*
 194  * Here are the locking policies for the two bonding locks:
 195  * Get rcu_read_lock when reading or RTNL when writing slave list.
 196  */
 197 struct bonding {
 198         struct   net_device *dev; /* first - useful for panic debug */
 199         struct   slave __rcu *curr_active_slave;
 200         struct   slave __rcu *current_arp_slave;
 201         struct   slave __rcu *primary_slave;
 202         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
 203         bool     force_primary;
 204         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 205         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 206                               struct slave *);
 207         /* mode_lock is used for mode-specific locking needs, currently used by:
 208          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 209          *                bond_3ad_state_machine_handler() concurrently and also
 210          *                the access to the state machine shared variables.
 211          * TLB mode (5) - to sync the use and modifications of its hash table
 212          * ALB mode (6) - to sync the use and modifications of its hash table
 213          */
 214         spinlock_t mode_lock;
 215         u8       send_peer_notif;
 216         u8       igmp_retrans;
 217 #ifdef CONFIG_PROC_FS
 218         struct   proc_dir_entry *proc_entry;
 219         char     proc_file_name[IFNAMSIZ];
 220 #endif /* CONFIG_PROC_FS */
 221         struct   list_head bond_list;
 222         u32      rr_tx_counter;
 223         struct   ad_bond_info ad_info;
 224         struct   alb_bond_info alb_info;
 225         struct   bond_params params;
 226         struct   workqueue_struct *wq;
 227         struct   delayed_work mii_work;
 228         struct   delayed_work arp_work;
 229         struct   delayed_work alb_work;
 230         struct   delayed_work ad_work;
 231         struct   delayed_work mcast_work;
 232         struct   delayed_work slave_arr_work;
 233 #ifdef CONFIG_DEBUG_FS
 234         /* debugging support via debugfs */
 235         struct   dentry *debug_dir;
 236 #endif /* CONFIG_DEBUG_FS */
 237         struct rtnl_link_stats64 bond_stats;
 238 };
 239
 240 #define bond_slave_get_rcu(dev) \
 241         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 242
 243 #define bond_slave_get_rtnl(dev) \
 244         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 245
 246 struct bond_vlan_tag {
 247         __be16          vlan_proto;
 248         unsigned short  vlan_id;
 249 };
 250
 251 /**
 252  * Returns NULL if the net_device does not belong to any of the bond's slaves
 253  *
 254  * Caller must hold bond lock for read
 255  */
 256 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 257                                                   struct net_device *slave_dev)
 258 {
 259         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 260 }
 261
 262 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 263 {
 264         return slave->bond;
 265 }
 266
 267 static inline bool bond_should_override_tx_queue(struct bonding *bond)
 268 {
 269         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
 270                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
 271 }
 272
 273 static inline bool bond_is_lb(const struct bonding *bond)
 274 {
 275         return BOND_MODE(bond) == BOND_MODE_TLB ||
 276                BOND_MODE(bond) == BOND_MODE_ALB;
 277 }
 278
 279 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 280 {
 281         return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
 282                (bond->params.tlb_dynamic_lb == 0);
 283 }
 284
 285 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
 286 {
 287         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 288                 BOND_MODE(bond) == BOND_MODE_XOR ||
 289                 bond_is_nondyn_tlb(bond));
 290 }
 291
 292 static inline bool bond_mode_uses_arp(int mode)
 293 {
 294         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
 295                mode != BOND_MODE_ALB;
 296 }
 297
 298 static inline bool bond_mode_uses_primary(int mode)
 299 {
 300         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
 301                mode == BOND_MODE_ALB;
 302 }
 303
 304 static inline bool bond_uses_primary(struct bonding *bond)
 305 {
 306         return bond_mode_uses_primary(BOND_MODE(bond));
 307 }
 308
 309 static inline bool bond_slave_is_up(struct slave *slave)
 310 {
 311         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 312 }
 313
 314 static inline void bond_set_active_slave(struct slave *slave)
 315 {
 316         if (slave->backup) {
 317                 slave->backup = 0;
 318                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 319         }
 320 }
 321
 322 static inline void bond_set_backup_slave(struct slave *slave)
 323 {
 324         if (!slave->backup) {
 325                 slave->backup = 1;
 326                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 327         }
 328 }
 329
 330 static inline void bond_set_slave_state(struct slave *slave,
 331                                         int slave_state, bool notify)
 332 {
 333         if (slave->backup == slave_state)
 334                 return;
 335
 336         slave->backup = slave_state;
 337         if (notify) {
 338                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 339                 slave->should_notify = 0;
 340         } else {
 341                 if (slave->should_notify)
 342                         slave->should_notify = 0;
 343                 else
 344                         slave->should_notify = 1;
 345         }
 346 }
 347
 348 static inline void bond_slave_state_change(struct bonding *bond)
 349 {
 350         struct list_head *iter;
 351         struct slave *tmp;
 352
 353         bond_for_each_slave(bond, tmp, iter) {
 354                 if (tmp->link == BOND_LINK_UP)
 355                         bond_set_active_slave(tmp);
 356                 else if (tmp->link == BOND_LINK_DOWN)
 357                         bond_set_backup_slave(tmp);
 358         }
 359 }
 360
 361 static inline void bond_slave_state_notify(struct bonding *bond)
 362 {
 363         struct list_head *iter;
 364         struct slave *tmp;
 365
 366         bond_for_each_slave(bond, tmp, iter) {
 367                 if (tmp->should_notify) {
 368                         rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
 369                         tmp->should_notify = 0;
 370                 }
 371         }
 372 }
 373
 374 static inline int bond_slave_state(struct slave *slave)
 375 {
 376         return slave->backup;
 377 }
 378
 379 static inline bool bond_is_active_slave(struct slave *slave)
 380 {
 381         return !bond_slave_state(slave);
 382 }
 383
 384 static inline bool bond_slave_can_tx(struct slave *slave)
 385 {
 386         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 387                bond_is_active_slave(slave);
 388 }
 389
 390 #define BOND_PRI_RESELECT_ALWAYS        0
 391 #define BOND_PRI_RESELECT_BETTER        1
 392 #define BOND_PRI_RESELECT_FAILURE       2
 393
 394 #define BOND_FOM_NONE                   0
 395 #define BOND_FOM_ACTIVE                 1
 396 #define BOND_FOM_FOLLOW                 2
 397
 398 #define BOND_ARP_TARGETS_ANY            0
 399 #define BOND_ARP_TARGETS_ALL            1
 400
 401 #define BOND_ARP_VALIDATE_NONE          0
 402 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 403 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 404 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 405                                          BOND_ARP_VALIDATE_BACKUP)
 406 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
 407 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
 408                                          BOND_ARP_FILTER)
 409 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
 410                                          BOND_ARP_FILTER)
 411
 412 #define BOND_SLAVE_NOTIFY_NOW           true
 413 #define BOND_SLAVE_NOTIFY_LATER         false
 414
 415 static inline int slave_do_arp_validate(struct bonding *bond,
 416                                         struct slave *slave)
 417 {
 418         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 419 }
 420
 421 static inline int slave_do_arp_validate_only(struct bonding *bond)
 422 {
 423         return bond->params.arp_validate & BOND_ARP_FILTER;
 424 }
 425
 426 static inline int bond_is_ip_target_ok(__be32 addr)
 427 {
 428         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
 429 }
 430
 431 /* Get the oldest arp which we've received on this slave for bond's
 432  * arp_targets.
 433  */
 434 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 435                                                        struct slave *slave)
 436 {
 437         int i = 1;
 438         unsigned long ret = slave->target_last_arp_rx[0];
 439
 440         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 441                 if (time_before(slave->target_last_arp_rx[i], ret))
 442                         ret = slave->target_last_arp_rx[i];
 443
 444         return ret;
 445 }
 446
 447 static inline unsigned long slave_last_rx(struct bonding *bond,
 448                                         struct slave *slave)
 449 {
 450         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 451                 return slave_oldest_target_arp_rx(bond, slave);
 452
 453         return slave->last_rx;
 454 }
 455
 456 #ifdef CONFIG_NET_POLL_CONTROLLER
 457 static inline void bond_netpoll_send_skb(const struct slave *slave,
 458                                          struct sk_buff *skb)
 459 {
 460         struct netpoll *np = slave->np;
 461
 462         if (np)
 463                 netpoll_send_skb(np, skb);
 464 }
 465 #else
 466 static inline void bond_netpoll_send_skb(const struct slave *slave,
 467                                          struct sk_buff *skb)
 468 {
 469 }
 470 #endif
 471
 472 static inline void bond_set_slave_inactive_flags(struct slave *slave,
 473                                                  bool notify)
 474 {
 475         if (!bond_is_lb(slave->bond))
 476                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 477         if (!slave->bond->params.all_slaves_active)
 478                 slave->inactive = 1;
 479 }
 480
 481 static inline void bond_set_slave_active_flags(struct slave *slave,
 482                                                bool notify)
 483 {
 484         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
 485         slave->inactive = 0;
 486 }
 487
 488 static inline bool bond_is_slave_inactive(struct slave *slave)
 489 {
 490         return slave->inactive;
 491 }
 492
 493 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 494 {
 495         struct in_device *in_dev;
 496         __be32 addr = 0;
 497
 498         rcu_read_lock();
 499         in_dev = __in_dev_get_rcu(dev);
 500
 501         if (in_dev)
 502                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 503                                          RT_SCOPE_HOST);
 504         rcu_read_unlock();
 505         return addr;
 506 }
 507
 508 struct bond_net {
 509         struct net              *net;   /* Associated network namespace */
 510         struct list_head        dev_list;
 511 #ifdef CONFIG_PROC_FS
 512         struct proc_dir_entry   *proc_dir;
 513 #endif
 514         struct class_attribute  class_attr_bonding_masters;
 515 };
 516
 517 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 518 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 519 int bond_create(struct net *net, const char *name);
 520 int bond_create_sysfs(struct bond_net *net);
 521 void bond_destroy_sysfs(struct bond_net *net);
 522 void bond_prepare_sysfs_group(struct bonding *bond);
 523 int bond_sysfs_slave_add(struct slave *slave);
 524 void bond_sysfs_slave_del(struct slave *slave);
 525 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 526 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 527 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 528 void bond_select_active_slave(struct bonding *bond);
 529 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 530 void bond_create_debugfs(void);
 531 void bond_destroy_debugfs(void);
 532 void bond_debug_register(struct bonding *bond);
 533 void bond_debug_unregister(struct bonding *bond);
 534 void bond_debug_reregister(struct bonding *bond);
 535 const char *bond_mode_name(int mode);
 536 void bond_setup(struct net_device *bond_dev);
 537 unsigned int bond_get_num_tx_queues(void);
 538 int bond_netlink_init(void);
 539 void bond_netlink_fini(void);
 540 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 541 const char *bond_slave_link_status(s8 link);
 542 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 543                                               struct net_device *end_dev,
 544                                               int level);
 545 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 546 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 547
 548 #ifdef CONFIG_PROC_FS
 549 void bond_create_proc_entry(struct bonding *bond);
 550 void bond_remove_proc_entry(struct bonding *bond);
 551 void bond_create_proc_dir(struct bond_net *bn);
 552 void bond_destroy_proc_dir(struct bond_net *bn);
 553 #else
 554 static inline void bond_create_proc_entry(struct bonding *bond)
 555 {
 556 }
 557
 558 static inline void bond_remove_proc_entry(struct bonding *bond)
 559 {
 560 }
 561
 562 static inline void bond_create_proc_dir(struct bond_net *bn)
 563 {
 564 }
 565
 566 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 567 {
 568 }
 569 #endif
 570
 571 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 572                                                const u8 *mac)
 573 {
 574         struct list_head *iter;
 575         struct slave *tmp;
 576
 577         bond_for_each_slave(bond, tmp, iter)
 578                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 579                         return tmp;
 580
 581         return NULL;
 582 }
 583
 584 /* Caller must hold rcu_read_lock() for read */
 585 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 586                                                const u8 *mac)
 587 {
 588         struct list_head *iter;
 589         struct slave *tmp;
 590
 591         bond_for_each_slave_rcu(bond, tmp, iter)
 592                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 593                         return tmp;
 594
 595         return NULL;
 596 }
 597
 598 /* Caller must hold rcu_read_lock() for read */
 599 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
 600 {
 601         struct list_head *iter;
 602         struct slave *tmp;
 603         struct netdev_hw_addr *ha;
 604
 605         bond_for_each_slave_rcu(bond, tmp, iter)
 606                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 607                         return true;
 608
 609         if (netdev_uc_empty(bond->dev))
 610                 return false;
 611
 612         netdev_for_each_uc_addr(ha, bond->dev)
 613                 if (ether_addr_equal_64bits(mac, ha->addr))
 614                         return true;
 615
 616         return false;
 617 }
 618
 619 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 620  * Returns -1 if not found, index if found
 621  */
 622 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 623 {
 624         int i;
 625
 626         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 627                 if (targets[i] == ip)
 628                         return i;
 629                 else if (targets[i] == 0)
 630                         break;
 631
 632         return -1;
 633 }
 634
 635 /* exported from bond_main.c */
 636 extern int bond_net_id;
 637 extern const struct bond_parm_tbl bond_lacp_tbl[];
 638 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 639 extern const struct bond_parm_tbl arp_validate_tbl[];
 640 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 641 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 642 extern const struct bond_parm_tbl pri_reselect_tbl[];
 643 extern struct bond_parm_tbl ad_select_tbl[];
 644
 645 /* exported from bond_netlink.c */
 646 extern struct rtnl_link_ops bond_link_ops;
 647
 648 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 649 {
 650         atomic_long_inc(&dev->tx_dropped);
 651         dev_kfree_skb_any(skb);
 652 }
 653
 654 #endif /* _NET_BONDING_H */