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 /*
  38  * Less bad way to call ioctl from within the kernel; this needs to be
  39  * done some other way to get the call out of interrupt context.
  40  * Needs "ioctl" variable to be supplied by calling context.
  41  */
  42 #define IOCTL(dev, arg, cmd) ({         \
  43         int res = 0;                    \
  44         mm_segment_t fs = get_fs();     \
  45         set_fs(get_ds());               \
  46         res = ioctl(dev, arg, cmd);     \
  47         set_fs(fs);                     \
  48         res; })
  49
  50 #define BOND_MODE(bond) ((bond)->params.mode)
  51
  52 /* slave list primitives */
  53 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
  54
  55 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
  56
  57 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
  58 #define bond_first_slave(bond) \
  59         (bond_has_slaves(bond) ? \
  60                 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
  61                 NULL)
  62 #define bond_last_slave(bond) \
  63         (bond_has_slaves(bond) ? \
  64                 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
  65                 NULL)
  66
  67 /* Caller must have rcu_read_lock */
  68 #define bond_first_slave_rcu(bond) \
  69         netdev_lower_get_first_private_rcu(bond->dev)
  70
  71 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
  72 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
  73
  74 /**
  75  * bond_for_each_slave - iterate over all slaves
  76  * @bond:       the bond holding this list
  77  * @pos:        current slave
  78  * @iter:       list_head * iterator
  79  *
  80  * Caller must hold RTNL
  81  */
  82 #define bond_for_each_slave(bond, pos, iter) \
  83         netdev_for_each_lower_private((bond)->dev, pos, iter)
  84
  85 /* Caller must have rcu_read_lock */
  86 #define bond_for_each_slave_rcu(bond, pos, iter) \
  87         netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
  88
  89 #ifdef CONFIG_NET_POLL_CONTROLLER
  90 extern atomic_t netpoll_block_tx;
  91
  92 static inline void block_netpoll_tx(void)
  93 {
  94         atomic_inc(&netpoll_block_tx);
  95 }
  96
  97 static inline void unblock_netpoll_tx(void)
  98 {
  99         atomic_dec(&netpoll_block_tx);
 100 }
 101
 102 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 103 {
 104         if (unlikely(netpoll_tx_running(dev)))
 105                 return atomic_read(&netpoll_block_tx);
 106         return 0;
 107 }
 108 #else
 109 #define block_netpoll_tx()
 110 #define unblock_netpoll_tx()
 111 #define is_netpoll_tx_blocked(dev) (0)
 112 #endif
 113
 114 struct bond_params {
 115         int mode;
 116         int xmit_policy;
 117         int miimon;
 118         u8 num_peer_notif;
 119         int arp_interval;
 120         int arp_validate;
 121         int arp_all_targets;
 122         int use_carrier;
 123         int fail_over_mac;
 124         int updelay;
 125         int downdelay;
 126         int lacp_fast;
 127         unsigned int min_links;
 128         int ad_select;
 129         char primary[IFNAMSIZ];
 130         int primary_reselect;
 131         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 132         int tx_queues;
 133         int all_slaves_active;
 134         int resend_igmp;
 135         int lp_interval;
 136         int packets_per_slave;
 137         int tlb_dynamic_lb;
 138         struct reciprocal_value reciprocal_packets_per_slave;
 139         u16 ad_actor_sys_prio;
 140         u16 ad_user_port_key;
 141         u8 ad_actor_system[ETH_ALEN];
 142 };
 143
 144 struct bond_parm_tbl {
 145         char *modename;
 146         int mode;
 147 };
 148
 149 struct netdev_notify_work {
 150         struct delayed_work     work;
 151         struct net_device       *dev;
 152         struct netdev_bonding_info bonding_info;
 153 };
 154
 155 struct slave {
 156         struct net_device *dev; /* first - useful for panic debug */
 157         struct bonding *bond; /* our master */
 158         int    delay;
 159         /* all three in jiffies */
 160         unsigned long last_link_up;
 161         unsigned long last_rx;
 162         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 163         s8     link;    /* one of BOND_LINK_XXXX */
 164         s8     new_link;
 165         u8     backup:1,   /* indicates backup slave. Value corresponds with
 166                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 167                inactive:1, /* indicates inactive slave */
 168                should_notify:1, /* indicates whether the state changed */
 169                should_notify_link:1; /* indicates whether the link changed */
 170         u8     duplex;
 171         u32    original_mtu;
 172         u32    link_failure_count;
 173         u32    speed;
 174         u16    queue_id;
 175         u8     perm_hwaddr[ETH_ALEN];
 176         struct ad_slave_info *ad_info;
 177         struct tlb_slave_info tlb_info;
 178 #ifdef CONFIG_NET_POLL_CONTROLLER
 179         struct netpoll *np;
 180 #endif
 181         struct kobject kobj;
 182         struct rtnl_link_stats64 slave_stats;
 183 };
 184
 185 struct bond_up_slave {
 186         unsigned int    count;
 187         struct rcu_head rcu;
 188         struct slave    *arr[0];
 189 };
 190
 191 /*
 192  * Link pseudo-state only used internally by monitors
 193  */
 194 #define BOND_LINK_NOCHANGE -1
 195
 196 /*
 197  * Here are the locking policies for the two bonding locks:
 198  * Get rcu_read_lock when reading or RTNL when writing slave list.
 199  */
 200 struct bonding {
 201         struct   net_device *dev; /* first - useful for panic debug */
 202         struct   slave __rcu *curr_active_slave;
 203         struct   slave __rcu *current_arp_slave;
 204         struct   slave __rcu *primary_slave;
 205         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
 206         bool     force_primary;
 207         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 208         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 209                               struct slave *);
 210         /* mode_lock is used for mode-specific locking needs, currently used by:
 211          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 212          *                bond_3ad_state_machine_handler() concurrently and also
 213          *                the access to the state machine shared variables.
 214          * TLB mode (5) - to sync the use and modifications of its hash table
 215          * ALB mode (6) - to sync the use and modifications of its hash table
 216          */
 217         spinlock_t mode_lock;
 218         u8       send_peer_notif;
 219         u8       igmp_retrans;
 220 #ifdef CONFIG_PROC_FS
 221         struct   proc_dir_entry *proc_entry;
 222         char     proc_file_name[IFNAMSIZ];
 223 #endif /* CONFIG_PROC_FS */
 224         struct   list_head bond_list;
 225         u32      rr_tx_counter;
 226         struct   ad_bond_info ad_info;
 227         struct   alb_bond_info alb_info;
 228         struct   bond_params params;
 229         struct   workqueue_struct *wq;
 230         struct   delayed_work mii_work;
 231         struct   delayed_work arp_work;
 232         struct   delayed_work alb_work;
 233         struct   delayed_work ad_work;
 234         struct   delayed_work mcast_work;
 235         struct   delayed_work slave_arr_work;
 236 #ifdef CONFIG_DEBUG_FS
 237         /* debugging support via debugfs */
 238         struct   dentry *debug_dir;
 239 #endif /* CONFIG_DEBUG_FS */
 240         struct rtnl_link_stats64 bond_stats;
 241 };
 242
 243 #define bond_slave_get_rcu(dev) \
 244         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 245
 246 #define bond_slave_get_rtnl(dev) \
 247         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 248
 249 void bond_queue_slave_event(struct slave *slave);
 250
 251 struct bond_vlan_tag {
 252         __be16          vlan_proto;
 253         unsigned short  vlan_id;
 254 };
 255
 256 /**
 257  * Returns NULL if the net_device does not belong to any of the bond's slaves
 258  *
 259  * Caller must hold bond lock for read
 260  */
 261 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 262                                                   struct net_device *slave_dev)
 263 {
 264         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 265 }
 266
 267 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 268 {
 269         return slave->bond;
 270 }
 271
 272 static inline bool bond_should_override_tx_queue(struct bonding *bond)
 273 {
 274         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
 275                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
 276 }
 277
 278 static inline bool bond_is_lb(const struct bonding *bond)
 279 {
 280         return BOND_MODE(bond) == BOND_MODE_TLB ||
 281                BOND_MODE(bond) == BOND_MODE_ALB;
 282 }
 283
 284 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 285 {
 286         return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
 287                (bond->params.tlb_dynamic_lb == 0);
 288 }
 289
 290 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
 291 {
 292         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 293                 BOND_MODE(bond) == BOND_MODE_XOR ||
 294                 bond_is_nondyn_tlb(bond));
 295 }
 296
 297 static inline bool bond_mode_uses_arp(int mode)
 298 {
 299         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
 300                mode != BOND_MODE_ALB;
 301 }
 302
 303 static inline bool bond_mode_uses_primary(int mode)
 304 {
 305         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
 306                mode == BOND_MODE_ALB;
 307 }
 308
 309 static inline bool bond_uses_primary(struct bonding *bond)
 310 {
 311         return bond_mode_uses_primary(BOND_MODE(bond));
 312 }
 313
 314 static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
 315 {
 316         struct slave *slave = rcu_dereference(bond->curr_active_slave);
 317
 318         return bond_uses_primary(bond) && slave ? slave->dev : NULL;
 319 }
 320
 321 static inline bool bond_slave_is_up(struct slave *slave)
 322 {
 323         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 324 }
 325
 326 static inline void bond_set_active_slave(struct slave *slave)
 327 {
 328         if (slave->backup) {
 329                 slave->backup = 0;
 330                 bond_queue_slave_event(slave);
 331                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 332         }
 333 }
 334
 335 static inline void bond_set_backup_slave(struct slave *slave)
 336 {
 337         if (!slave->backup) {
 338                 slave->backup = 1;
 339                 bond_queue_slave_event(slave);
 340                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 341         }
 342 }
 343
 344 static inline void bond_set_slave_state(struct slave *slave,
 345                                         int slave_state, bool notify)
 346 {
 347         if (slave->backup == slave_state)
 348                 return;
 349
 350         slave->backup = slave_state;
 351         if (notify) {
 352                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 353                 bond_queue_slave_event(slave);
 354                 slave->should_notify = 0;
 355         } else {
 356                 if (slave->should_notify)
 357                         slave->should_notify = 0;
 358                 else
 359                         slave->should_notify = 1;
 360         }
 361 }
 362
 363 static inline void bond_slave_state_change(struct bonding *bond)
 364 {
 365         struct list_head *iter;
 366         struct slave *tmp;
 367
 368         bond_for_each_slave(bond, tmp, iter) {
 369                 if (tmp->link == BOND_LINK_UP)
 370                         bond_set_active_slave(tmp);
 371                 else if (tmp->link == BOND_LINK_DOWN)
 372                         bond_set_backup_slave(tmp);
 373         }
 374 }
 375
 376 static inline void bond_slave_state_notify(struct bonding *bond)
 377 {
 378         struct list_head *iter;
 379         struct slave *tmp;
 380
 381         bond_for_each_slave(bond, tmp, iter) {
 382                 if (tmp->should_notify) {
 383                         rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
 384                         tmp->should_notify = 0;
 385                 }
 386         }
 387 }
 388
 389 static inline int bond_slave_state(struct slave *slave)
 390 {
 391         return slave->backup;
 392 }
 393
 394 static inline bool bond_is_active_slave(struct slave *slave)
 395 {
 396         return !bond_slave_state(slave);
 397 }
 398
 399 static inline bool bond_slave_can_tx(struct slave *slave)
 400 {
 401         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 402                bond_is_active_slave(slave);
 403 }
 404
 405 #define BOND_PRI_RESELECT_ALWAYS        0
 406 #define BOND_PRI_RESELECT_BETTER        1
 407 #define BOND_PRI_RESELECT_FAILURE       2
 408
 409 #define BOND_FOM_NONE                   0
 410 #define BOND_FOM_ACTIVE                 1
 411 #define BOND_FOM_FOLLOW                 2
 412
 413 #define BOND_ARP_TARGETS_ANY            0
 414 #define BOND_ARP_TARGETS_ALL            1
 415
 416 #define BOND_ARP_VALIDATE_NONE          0
 417 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 418 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 419 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 420                                          BOND_ARP_VALIDATE_BACKUP)
 421 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
 422 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
 423                                          BOND_ARP_FILTER)
 424 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
 425                                          BOND_ARP_FILTER)
 426
 427 #define BOND_SLAVE_NOTIFY_NOW           true
 428 #define BOND_SLAVE_NOTIFY_LATER         false
 429
 430 static inline int slave_do_arp_validate(struct bonding *bond,
 431                                         struct slave *slave)
 432 {
 433         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 434 }
 435
 436 static inline int slave_do_arp_validate_only(struct bonding *bond)
 437 {
 438         return bond->params.arp_validate & BOND_ARP_FILTER;
 439 }
 440
 441 static inline int bond_is_ip_target_ok(__be32 addr)
 442 {
 443         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
 444 }
 445
 446 /* Get the oldest arp which we've received on this slave for bond's
 447  * arp_targets.
 448  */
 449 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 450                                                        struct slave *slave)
 451 {
 452         int i = 1;
 453         unsigned long ret = slave->target_last_arp_rx[0];
 454
 455         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 456                 if (time_before(slave->target_last_arp_rx[i], ret))
 457                         ret = slave->target_last_arp_rx[i];
 458
 459         return ret;
 460 }
 461
 462 static inline unsigned long slave_last_rx(struct bonding *bond,
 463                                         struct slave *slave)
 464 {
 465         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 466                 return slave_oldest_target_arp_rx(bond, slave);
 467
 468         return slave->last_rx;
 469 }
 470
 471 #ifdef CONFIG_NET_POLL_CONTROLLER
 472 static inline void bond_netpoll_send_skb(const struct slave *slave,
 473                                          struct sk_buff *skb)
 474 {
 475         struct netpoll *np = slave->np;
 476
 477         if (np)
 478                 netpoll_send_skb(np, skb);
 479 }
 480 #else
 481 static inline void bond_netpoll_send_skb(const struct slave *slave,
 482                                          struct sk_buff *skb)
 483 {
 484 }
 485 #endif
 486
 487 static inline void bond_set_slave_inactive_flags(struct slave *slave,
 488                                                  bool notify)
 489 {
 490         if (!bond_is_lb(slave->bond))
 491                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 492         if (!slave->bond->params.all_slaves_active)
 493                 slave->inactive = 1;
 494 }
 495
 496 static inline void bond_set_slave_active_flags(struct slave *slave,
 497                                                bool notify)
 498 {
 499         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
 500         slave->inactive = 0;
 501 }
 502
 503 static inline bool bond_is_slave_inactive(struct slave *slave)
 504 {
 505         return slave->inactive;
 506 }
 507
 508 static inline void bond_set_slave_link_state(struct slave *slave, int state,
 509                                              bool notify)
 510 {
 511         if (slave->link == state)
 512                 return;
 513
 514         slave->link = state;
 515         if (notify) {
 516                 bond_queue_slave_event(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                         tmp->should_notify_link = 0;
 535                 }
 536         }
 537 }
 538
 539 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 540 {
 541         struct in_device *in_dev;
 542         __be32 addr = 0;
 543
 544         rcu_read_lock();
 545         in_dev = __in_dev_get_rcu(dev);
 546
 547         if (in_dev)
 548                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 549                                          RT_SCOPE_HOST);
 550         rcu_read_unlock();
 551         return addr;
 552 }
 553
 554 struct bond_net {
 555         struct net              *net;   /* Associated network namespace */
 556         struct list_head        dev_list;
 557 #ifdef CONFIG_PROC_FS
 558         struct proc_dir_entry   *proc_dir;
 559 #endif
 560         struct class_attribute  class_attr_bonding_masters;
 561 };
 562
 563 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 564 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 565 int bond_create(struct net *net, const char *name);
 566 int bond_create_sysfs(struct bond_net *net);
 567 void bond_destroy_sysfs(struct bond_net *net);
 568 void bond_prepare_sysfs_group(struct bonding *bond);
 569 int bond_sysfs_slave_add(struct slave *slave);
 570 void bond_sysfs_slave_del(struct slave *slave);
 571 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 572 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 573 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 574 int bond_set_carrier(struct bonding *bond);
 575 void bond_select_active_slave(struct bonding *bond);
 576 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 577 void bond_create_debugfs(void);
 578 void bond_destroy_debugfs(void);
 579 void bond_debug_register(struct bonding *bond);
 580 void bond_debug_unregister(struct bonding *bond);
 581 void bond_debug_reregister(struct bonding *bond);
 582 const char *bond_mode_name(int mode);
 583 void bond_setup(struct net_device *bond_dev);
 584 unsigned int bond_get_num_tx_queues(void);
 585 int bond_netlink_init(void);
 586 void bond_netlink_fini(void);
 587 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 588 const char *bond_slave_link_status(s8 link);
 589 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 590                                               struct net_device *end_dev,
 591                                               int level);
 592 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 593 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 594
 595 #ifdef CONFIG_PROC_FS
 596 void bond_create_proc_entry(struct bonding *bond);
 597 void bond_remove_proc_entry(struct bonding *bond);
 598 void bond_create_proc_dir(struct bond_net *bn);
 599 void bond_destroy_proc_dir(struct bond_net *bn);
 600 #else
 601 static inline void bond_create_proc_entry(struct bonding *bond)
 602 {
 603 }
 604
 605 static inline void bond_remove_proc_entry(struct bonding *bond)
 606 {
 607 }
 608
 609 static inline void bond_create_proc_dir(struct bond_net *bn)
 610 {
 611 }
 612
 613 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 614 {
 615 }
 616 #endif
 617
 618 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 619                                                const u8 *mac)
 620 {
 621         struct list_head *iter;
 622         struct slave *tmp;
 623
 624         bond_for_each_slave(bond, tmp, iter)
 625                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 626                         return tmp;
 627
 628         return NULL;
 629 }
 630
 631 /* Caller must hold rcu_read_lock() for read */
 632 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 633                                                const u8 *mac)
 634 {
 635         struct list_head *iter;
 636         struct slave *tmp;
 637
 638         bond_for_each_slave_rcu(bond, tmp, iter)
 639                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 640                         return tmp;
 641
 642         return NULL;
 643 }
 644
 645 /* Caller must hold rcu_read_lock() for read */
 646 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
 647 {
 648         struct list_head *iter;
 649         struct slave *tmp;
 650         struct netdev_hw_addr *ha;
 651
 652         bond_for_each_slave_rcu(bond, tmp, iter)
 653                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 654                         return true;
 655
 656         if (netdev_uc_empty(bond->dev))
 657                 return false;
 658
 659         netdev_for_each_uc_addr(ha, bond->dev)
 660                 if (ether_addr_equal_64bits(mac, ha->addr))
 661                         return true;
 662
 663         return false;
 664 }
 665
 666 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 667  * Returns -1 if not found, index if found
 668  */
 669 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 670 {
 671         int i;
 672
 673         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 674                 if (targets[i] == ip)
 675                         return i;
 676                 else if (targets[i] == 0)
 677                         break;
 678
 679         return -1;
 680 }
 681
 682 /* exported from bond_main.c */
 683 extern int bond_net_id;
 684 extern const struct bond_parm_tbl bond_lacp_tbl[];
 685 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 686 extern const struct bond_parm_tbl arp_validate_tbl[];
 687 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 688 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 689 extern const struct bond_parm_tbl pri_reselect_tbl[];
 690 extern struct bond_parm_tbl ad_select_tbl[];
 691
 692 /* exported from bond_netlink.c */
 693 extern struct rtnl_link_ops bond_link_ops;
 694
 695 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 696 {
 697         atomic_long_inc(&dev->tx_dropped);
 698         dev_kfree_skb_any(skb);
 699 }
 700
 701 #endif /* _NET_BONDING_H */