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 BOND_MAX_ARP_TARGETS    16
  34
  35 #define BOND_DEFAULT_MIIMON     100
  36
  37 #ifndef __long_aligned
  38 #define __long_aligned __attribute__((aligned((sizeof(long)))))
  39 #endif
  40
  41 #define BOND_MODE(bond) ((bond)->params.mode)
  42
  43 /* slave list primitives */
  44 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
  45
  46 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
  47
  48 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
  49 #define bond_first_slave(bond) \
  50         (bond_has_slaves(bond) ? \
  51                 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
  52                 NULL)
  53 #define bond_last_slave(bond) \
  54         (bond_has_slaves(bond) ? \
  55                 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
  56                 NULL)
  57
  58 /* Caller must have rcu_read_lock */
  59 #define bond_first_slave_rcu(bond) \
  60         netdev_lower_get_first_private_rcu(bond->dev)
  61
  62 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
  63 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
  64
  65 /**
  66  * bond_for_each_slave - iterate over all slaves
  67  * @bond:       the bond holding this list
  68  * @pos:        current slave
  69  * @iter:       list_head * iterator
  70  *
  71  * Caller must hold RTNL
  72  */
  73 #define bond_for_each_slave(bond, pos, iter) \
  74         netdev_for_each_lower_private((bond)->dev, pos, iter)
  75
  76 /* Caller must have rcu_read_lock */
  77 #define bond_for_each_slave_rcu(bond, pos, iter) \
  78         netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
  79
  80 #ifdef CONFIG_NET_POLL_CONTROLLER
  81 extern atomic_t netpoll_block_tx;
  82
  83 static inline void block_netpoll_tx(void)
  84 {
  85         atomic_inc(&netpoll_block_tx);
  86 }
  87
  88 static inline void unblock_netpoll_tx(void)
  89 {
  90         atomic_dec(&netpoll_block_tx);
  91 }
  92
  93 static inline int is_netpoll_tx_blocked(struct net_device *dev)
  94 {
  95         if (unlikely(netpoll_tx_running(dev)))
  96                 return atomic_read(&netpoll_block_tx);
  97         return 0;
  98 }
  99 #else
 100 #define block_netpoll_tx()
 101 #define unblock_netpoll_tx()
 102 #define is_netpoll_tx_blocked(dev) (0)
 103 #endif
 104
 105 struct bond_params {
 106         int mode;
 107         int xmit_policy;
 108         int miimon;
 109         u8 num_peer_notif;
 110         int arp_interval;
 111         int arp_validate;
 112         int arp_all_targets;
 113         int use_carrier;
 114         int fail_over_mac;
 115         int updelay;
 116         int downdelay;
 117         int lacp_fast;
 118         unsigned int min_links;
 119         int ad_select;
 120         char primary[IFNAMSIZ];
 121         int primary_reselect;
 122         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 123         int tx_queues;
 124         int all_slaves_active;
 125         int resend_igmp;
 126         int lp_interval;
 127         int packets_per_slave;
 128         int tlb_dynamic_lb;
 129         struct reciprocal_value reciprocal_packets_per_slave;
 130         u16 ad_actor_sys_prio;
 131         u16 ad_user_port_key;
 132
 133         /* 2 bytes of padding : see ether_addr_equal_64bits() */
 134         u8 ad_actor_system[ETH_ALEN + 2];
 135 };
 136
 137 struct bond_parm_tbl {
 138         char *modename;
 139         int mode;
 140 };
 141
 142 struct netdev_notify_work {
 143         struct delayed_work     work;
 144         struct net_device       *dev;
 145         struct netdev_bonding_info bonding_info;
 146 };
 147
 148 struct slave {
 149         struct net_device *dev; /* first - useful for panic debug */
 150         struct bonding *bond; /* our master */
 151         int    delay;
 152         /* all three in jiffies */
 153         unsigned long last_link_up;
 154         unsigned long last_rx;
 155         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 156         s8     link;    /* one of BOND_LINK_XXXX */
 157         s8     new_link;
 158         u8     backup:1,   /* indicates backup slave. Value corresponds with
 159                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 160                inactive:1, /* indicates inactive slave */
 161                should_notify:1, /* indicates whether the state changed */
 162                should_notify_link:1; /* indicates whether the link changed */
 163         u8     duplex;
 164         u32    original_mtu;
 165         u32    link_failure_count;
 166         u32    speed;
 167         u16    queue_id;
 168         u8     perm_hwaddr[ETH_ALEN];
 169         struct ad_slave_info *ad_info;
 170         struct tlb_slave_info tlb_info;
 171 #ifdef CONFIG_NET_POLL_CONTROLLER
 172         struct netpoll *np;
 173 #endif
 174         struct kobject kobj;
 175         struct rtnl_link_stats64 slave_stats;
 176 };
 177
 178 struct bond_up_slave {
 179         unsigned int    count;
 180         struct rcu_head rcu;
 181         struct slave    *arr[0];
 182 };
 183
 184 /*
 185  * Link pseudo-state only used internally by monitors
 186  */
 187 #define BOND_LINK_NOCHANGE -1
 188
 189 /*
 190  * Here are the locking policies for the two bonding locks:
 191  * Get rcu_read_lock when reading or RTNL when writing slave list.
 192  */
 193 struct bonding {
 194         struct   net_device *dev; /* first - useful for panic debug */
 195         struct   slave __rcu *curr_active_slave;
 196         struct   slave __rcu *current_arp_slave;
 197         struct   slave __rcu *primary_slave;
 198         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
 199         bool     force_primary;
 200         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 201         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 202                               struct slave *);
 203         /* mode_lock is used for mode-specific locking needs, currently used by:
 204          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 205          *                bond_3ad_state_machine_handler() concurrently and also
 206          *                the access to the state machine shared variables.
 207          * TLB mode (5) - to sync the use and modifications of its hash table
 208          * ALB mode (6) - to sync the use and modifications of its hash table
 209          */
 210         spinlock_t mode_lock;
 211         spinlock_t stats_lock;
 212         u8       send_peer_notif;
 213         u8       igmp_retrans;
 214 #ifdef CONFIG_PROC_FS
 215         struct   proc_dir_entry *proc_entry;
 216         char     proc_file_name[IFNAMSIZ];
 217 #endif /* CONFIG_PROC_FS */
 218         struct   list_head bond_list;
 219         u32      rr_tx_counter;
 220         struct   ad_bond_info ad_info;
 221         struct   alb_bond_info alb_info;
 222         struct   bond_params params;
 223         struct   workqueue_struct *wq;
 224         struct   delayed_work mii_work;
 225         struct   delayed_work arp_work;
 226         struct   delayed_work alb_work;
 227         struct   delayed_work ad_work;
 228         struct   delayed_work mcast_work;
 229         struct   delayed_work slave_arr_work;
 230 #ifdef CONFIG_DEBUG_FS
 231         /* debugging support via debugfs */
 232         struct   dentry *debug_dir;
 233 #endif /* CONFIG_DEBUG_FS */
 234         struct rtnl_link_stats64 bond_stats;
 235 };
 236
 237 #define bond_slave_get_rcu(dev) \
 238         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 239
 240 #define bond_slave_get_rtnl(dev) \
 241         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 242
 243 void bond_queue_slave_event(struct slave *slave);
 244 void bond_lower_state_changed(struct slave *slave);
 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 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
 310 {
 311         struct slave *slave = rcu_dereference(bond->curr_active_slave);
 312
 313         return bond_uses_primary(bond) && slave ? slave->dev : NULL;
 314 }
 315
 316 static inline bool bond_slave_is_up(struct slave *slave)
 317 {
 318         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 319 }
 320
 321 static inline void bond_set_active_slave(struct slave *slave)
 322 {
 323         if (slave->backup) {
 324                 slave->backup = 0;
 325                 bond_queue_slave_event(slave);
 326                 bond_lower_state_changed(slave);
 327                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 328         }
 329 }
 330
 331 static inline void bond_set_backup_slave(struct slave *slave)
 332 {
 333         if (!slave->backup) {
 334                 slave->backup = 1;
 335                 bond_queue_slave_event(slave);
 336                 bond_lower_state_changed(slave);
 337                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 338         }
 339 }
 340
 341 static inline void bond_set_slave_state(struct slave *slave,
 342                                         int slave_state, bool notify)
 343 {
 344         if (slave->backup == slave_state)
 345                 return;
 346
 347         slave->backup = slave_state;
 348         if (notify) {
 349                 bond_lower_state_changed(slave);
 350                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 351                 bond_queue_slave_event(slave);
 352                 slave->should_notify = 0;
 353         } else {
 354                 if (slave->should_notify)
 355                         slave->should_notify = 0;
 356                 else
 357                         slave->should_notify = 1;
 358         }
 359 }
 360
 361 static inline void bond_slave_state_change(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->link == BOND_LINK_UP)
 368                         bond_set_active_slave(tmp);
 369                 else if (tmp->link == BOND_LINK_DOWN)
 370                         bond_set_backup_slave(tmp);
 371         }
 372 }
 373
 374 static inline void bond_slave_state_notify(struct bonding *bond)
 375 {
 376         struct list_head *iter;
 377         struct slave *tmp;
 378
 379         bond_for_each_slave(bond, tmp, iter) {
 380                 if (tmp->should_notify) {
 381                         bond_lower_state_changed(tmp);
 382                         rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
 383                         tmp->should_notify = 0;
 384                 }
 385         }
 386 }
 387
 388 static inline int bond_slave_state(struct slave *slave)
 389 {
 390         return slave->backup;
 391 }
 392
 393 static inline bool bond_is_active_slave(struct slave *slave)
 394 {
 395         return !bond_slave_state(slave);
 396 }
 397
 398 static inline bool bond_slave_can_tx(struct slave *slave)
 399 {
 400         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 401                bond_is_active_slave(slave);
 402 }
 403
 404 #define BOND_PRI_RESELECT_ALWAYS        0
 405 #define BOND_PRI_RESELECT_BETTER        1
 406 #define BOND_PRI_RESELECT_FAILURE       2
 407
 408 #define BOND_FOM_NONE                   0
 409 #define BOND_FOM_ACTIVE                 1
 410 #define BOND_FOM_FOLLOW                 2
 411
 412 #define BOND_ARP_TARGETS_ANY            0
 413 #define BOND_ARP_TARGETS_ALL            1
 414
 415 #define BOND_ARP_VALIDATE_NONE          0
 416 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 417 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 418 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 419                                          BOND_ARP_VALIDATE_BACKUP)
 420 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
 421 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
 422                                          BOND_ARP_FILTER)
 423 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
 424                                          BOND_ARP_FILTER)
 425
 426 #define BOND_SLAVE_NOTIFY_NOW           true
 427 #define BOND_SLAVE_NOTIFY_LATER         false
 428
 429 static inline int slave_do_arp_validate(struct bonding *bond,
 430                                         struct slave *slave)
 431 {
 432         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 433 }
 434
 435 static inline int slave_do_arp_validate_only(struct bonding *bond)
 436 {
 437         return bond->params.arp_validate & BOND_ARP_FILTER;
 438 }
 439
 440 static inline int bond_is_ip_target_ok(__be32 addr)
 441 {
 442         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
 443 }
 444
 445 /* Get the oldest arp which we've received on this slave for bond's
 446  * arp_targets.
 447  */
 448 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 449                                                        struct slave *slave)
 450 {
 451         int i = 1;
 452         unsigned long ret = slave->target_last_arp_rx[0];
 453
 454         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 455                 if (time_before(slave->target_last_arp_rx[i], ret))
 456                         ret = slave->target_last_arp_rx[i];
 457
 458         return ret;
 459 }
 460
 461 static inline unsigned long slave_last_rx(struct bonding *bond,
 462                                         struct slave *slave)
 463 {
 464         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 465                 return slave_oldest_target_arp_rx(bond, slave);
 466
 467         return slave->last_rx;
 468 }
 469
 470 #ifdef CONFIG_NET_POLL_CONTROLLER
 471 static inline void bond_netpoll_send_skb(const struct slave *slave,
 472                                          struct sk_buff *skb)
 473 {
 474         struct netpoll *np = slave->np;
 475
 476         if (np)
 477                 netpoll_send_skb(np, skb);
 478 }
 479 #else
 480 static inline void bond_netpoll_send_skb(const struct slave *slave,
 481                                          struct sk_buff *skb)
 482 {
 483 }
 484 #endif
 485
 486 static inline void bond_set_slave_inactive_flags(struct slave *slave,
 487                                                  bool notify)
 488 {
 489         if (!bond_is_lb(slave->bond))
 490                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 491         if (!slave->bond->params.all_slaves_active)
 492                 slave->inactive = 1;
 493 }
 494
 495 static inline void bond_set_slave_active_flags(struct slave *slave,
 496                                                bool notify)
 497 {
 498         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
 499         slave->inactive = 0;
 500 }
 501
 502 static inline bool bond_is_slave_inactive(struct slave *slave)
 503 {
 504         return slave->inactive;
 505 }
 506
 507 static inline void bond_set_slave_link_state(struct slave *slave, int state,
 508                                              bool notify)
 509 {
 510         if (slave->link == state)
 511                 return;
 512
 513         slave->link = state;
 514         if (notify) {
 515                 bond_queue_slave_event(slave);
 516                 bond_lower_state_changed(slave);
 517                 slave->should_notify_link = 0;
 518         } else {
 519                 if (slave->should_notify_link)
 520                         slave->should_notify_link = 0;
 521                 else
 522                         slave->should_notify_link = 1;
 523         }
 524 }
 525
 526 static inline void bond_slave_link_notify(struct bonding *bond)
 527 {
 528         struct list_head *iter;
 529         struct slave *tmp;
 530
 531         bond_for_each_slave(bond, tmp, iter) {
 532                 if (tmp->should_notify_link) {
 533                         bond_queue_slave_event(tmp);
 534                         bond_lower_state_changed(tmp);
 535                         tmp->should_notify_link = 0;
 536                 }
 537         }
 538 }
 539
 540 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 541 {
 542         struct in_device *in_dev;
 543         __be32 addr = 0;
 544
 545         rcu_read_lock();
 546         in_dev = __in_dev_get_rcu(dev);
 547
 548         if (in_dev)
 549                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 550                                          RT_SCOPE_HOST);
 551         rcu_read_unlock();
 552         return addr;
 553 }
 554
 555 struct bond_net {
 556         struct net              *net;   /* Associated network namespace */
 557         struct list_head        dev_list;
 558 #ifdef CONFIG_PROC_FS
 559         struct proc_dir_entry   *proc_dir;
 560 #endif
 561         struct class_attribute  class_attr_bonding_masters;
 562 };
 563
 564 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 565 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 566 int bond_create(struct net *net, const char *name);
 567 int bond_create_sysfs(struct bond_net *net);
 568 void bond_destroy_sysfs(struct bond_net *net);
 569 void bond_prepare_sysfs_group(struct bonding *bond);
 570 int bond_sysfs_slave_add(struct slave *slave);
 571 void bond_sysfs_slave_del(struct slave *slave);
 572 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 573 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 574 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 575 int bond_set_carrier(struct bonding *bond);
 576 void bond_select_active_slave(struct bonding *bond);
 577 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 578 void bond_create_debugfs(void);
 579 void bond_destroy_debugfs(void);
 580 void bond_debug_register(struct bonding *bond);
 581 void bond_debug_unregister(struct bonding *bond);
 582 void bond_debug_reregister(struct bonding *bond);
 583 const char *bond_mode_name(int mode);
 584 void bond_setup(struct net_device *bond_dev);
 585 unsigned int bond_get_num_tx_queues(void);
 586 int bond_netlink_init(void);
 587 void bond_netlink_fini(void);
 588 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 589 const char *bond_slave_link_status(s8 link);
 590 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 591                                               struct net_device *end_dev,
 592                                               int level);
 593 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 594 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 595
 596 #ifdef CONFIG_PROC_FS
 597 void bond_create_proc_entry(struct bonding *bond);
 598 void bond_remove_proc_entry(struct bonding *bond);
 599 void bond_create_proc_dir(struct bond_net *bn);
 600 void bond_destroy_proc_dir(struct bond_net *bn);
 601 #else
 602 static inline void bond_create_proc_entry(struct bonding *bond)
 603 {
 604 }
 605
 606 static inline void bond_remove_proc_entry(struct bonding *bond)
 607 {
 608 }
 609
 610 static inline void bond_create_proc_dir(struct bond_net *bn)
 611 {
 612 }
 613
 614 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 615 {
 616 }
 617 #endif
 618
 619 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 620                                                const u8 *mac)
 621 {
 622         struct list_head *iter;
 623         struct slave *tmp;
 624
 625         bond_for_each_slave(bond, tmp, iter)
 626                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 627                         return tmp;
 628
 629         return NULL;
 630 }
 631
 632 /* Caller must hold rcu_read_lock() for read */
 633 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 634                                                const u8 *mac)
 635 {
 636         struct list_head *iter;
 637         struct slave *tmp;
 638
 639         bond_for_each_slave_rcu(bond, tmp, iter)
 640                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 641                         return tmp;
 642
 643         return NULL;
 644 }
 645
 646 /* Caller must hold rcu_read_lock() for read */
 647 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
 648 {
 649         struct list_head *iter;
 650         struct slave *tmp;
 651         struct netdev_hw_addr *ha;
 652
 653         bond_for_each_slave_rcu(bond, tmp, iter)
 654                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 655                         return true;
 656
 657         if (netdev_uc_empty(bond->dev))
 658                 return false;
 659
 660         netdev_for_each_uc_addr(ha, bond->dev)
 661                 if (ether_addr_equal_64bits(mac, ha->addr))
 662                         return true;
 663
 664         return false;
 665 }
 666
 667 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 668  * Returns -1 if not found, index if found
 669  */
 670 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 671 {
 672         int i;
 673
 674         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 675                 if (targets[i] == ip)
 676                         return i;
 677                 else if (targets[i] == 0)
 678                         break;
 679
 680         return -1;
 681 }
 682
 683 /* exported from bond_main.c */
 684 extern unsigned int bond_net_id;
 685 extern const struct bond_parm_tbl bond_lacp_tbl[];
 686 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 687 extern const struct bond_parm_tbl arp_validate_tbl[];
 688 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 689 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 690 extern const struct bond_parm_tbl pri_reselect_tbl[];
 691 extern struct bond_parm_tbl ad_select_tbl[];
 692
 693 /* exported from bond_netlink.c */
 694 extern struct rtnl_link_ops bond_link_ops;
 695
 696 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 697 {
 698         atomic_long_inc(&dev->tx_dropped);
 699         dev_kfree_skb_any(skb);
 700 }
 701
 702 #endif /* _NET_BONDING_H */