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  * Less bad way to call ioctl from within the kernel; this needs to be
  42  * done some other way to get the call out of interrupt context.
  43  * Needs "ioctl" variable to be supplied by calling context.
  44  */
  45 #define IOCTL(dev, arg, cmd) ({         \
  46         int res = 0;                    \
  47         mm_segment_t fs = get_fs();     \
  48         set_fs(get_ds());               \
  49         res = ioctl(dev, arg, cmd);     \
  50         set_fs(fs);                     \
  51         res; })
  52
  53 #define BOND_MODE(bond) ((bond)->params.mode)
  54
  55 /* slave list primitives */
  56 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
  57
  58 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
  59
  60 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
  61 #define bond_first_slave(bond) \
  62         (bond_has_slaves(bond) ? \
  63                 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
  64                 NULL)
  65 #define bond_last_slave(bond) \
  66         (bond_has_slaves(bond) ? \
  67                 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
  68                 NULL)
  69
  70 /* Caller must have rcu_read_lock */
  71 #define bond_first_slave_rcu(bond) \
  72         netdev_lower_get_first_private_rcu(bond->dev)
  73
  74 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
  75 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
  76
  77 /**
  78  * bond_for_each_slave - iterate over all slaves
  79  * @bond:       the bond holding this list
  80  * @pos:        current slave
  81  * @iter:       list_head * iterator
  82  *
  83  * Caller must hold RTNL
  84  */
  85 #define bond_for_each_slave(bond, pos, iter) \
  86         netdev_for_each_lower_private((bond)->dev, pos, iter)
  87
  88 /* Caller must have rcu_read_lock */
  89 #define bond_for_each_slave_rcu(bond, pos, iter) \
  90         netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
  91
  92 #ifdef CONFIG_NET_POLL_CONTROLLER
  93 extern atomic_t netpoll_block_tx;
  94
  95 static inline void block_netpoll_tx(void)
  96 {
  97         atomic_inc(&netpoll_block_tx);
  98 }
  99
 100 static inline void unblock_netpoll_tx(void)
 101 {
 102         atomic_dec(&netpoll_block_tx);
 103 }
 104
 105 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 106 {
 107         if (unlikely(netpoll_tx_running(dev)))
 108                 return atomic_read(&netpoll_block_tx);
 109         return 0;
 110 }
 111 #else
 112 #define block_netpoll_tx()
 113 #define unblock_netpoll_tx()
 114 #define is_netpoll_tx_blocked(dev) (0)
 115 #endif
 116
 117 struct bond_params {
 118         int mode;
 119         int xmit_policy;
 120         int miimon;
 121         u8 num_peer_notif;
 122         int arp_interval;
 123         int arp_validate;
 124         int arp_all_targets;
 125         int use_carrier;
 126         int fail_over_mac;
 127         int updelay;
 128         int downdelay;
 129         int lacp_fast;
 130         unsigned int min_links;
 131         int ad_select;
 132         char primary[IFNAMSIZ];
 133         int primary_reselect;
 134         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 135         int tx_queues;
 136         int all_slaves_active;
 137         int resend_igmp;
 138         int lp_interval;
 139         int packets_per_slave;
 140         int tlb_dynamic_lb;
 141         struct reciprocal_value reciprocal_packets_per_slave;
 142         u16 ad_actor_sys_prio;
 143         u16 ad_user_port_key;
 144
 145         /* 2 bytes of padding : see ether_addr_equal_64bits() */
 146         u8 ad_actor_system[ETH_ALEN + 2];
 147 };
 148
 149 struct bond_parm_tbl {
 150         char *modename;
 151         int mode;
 152 };
 153
 154 struct netdev_notify_work {
 155         struct delayed_work     work;
 156         struct net_device       *dev;
 157         struct netdev_bonding_info bonding_info;
 158 };
 159
 160 struct slave {
 161         struct net_device *dev; /* first - useful for panic debug */
 162         struct bonding *bond; /* our master */
 163         int    delay;
 164         /* all three in jiffies */
 165         unsigned long last_link_up;
 166         unsigned long last_rx;
 167         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 168         s8     link;    /* one of BOND_LINK_XXXX */
 169         s8     new_link;
 170         u8     backup:1,   /* indicates backup slave. Value corresponds with
 171                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 172                inactive:1, /* indicates inactive slave */
 173                should_notify:1, /* indicates whether the state changed */
 174                should_notify_link:1; /* indicates whether the link changed */
 175         u8     duplex;
 176         u32    original_mtu;
 177         u32    link_failure_count;
 178         u32    speed;
 179         u16    queue_id;
 180         u8     perm_hwaddr[ETH_ALEN];
 181         struct ad_slave_info *ad_info;
 182         struct tlb_slave_info tlb_info;
 183 #ifdef CONFIG_NET_POLL_CONTROLLER
 184         struct netpoll *np;
 185 #endif
 186         struct kobject kobj;
 187         struct rtnl_link_stats64 slave_stats;
 188 };
 189
 190 struct bond_up_slave {
 191         unsigned int    count;
 192         struct rcu_head rcu;
 193         struct slave    *arr[0];
 194 };
 195
 196 /*
 197  * Link pseudo-state only used internally by monitors
 198  */
 199 #define BOND_LINK_NOCHANGE -1
 200
 201 /*
 202  * Here are the locking policies for the two bonding locks:
 203  * Get rcu_read_lock when reading or RTNL when writing slave list.
 204  */
 205 struct bonding {
 206         struct   net_device *dev; /* first - useful for panic debug */
 207         struct   slave __rcu *curr_active_slave;
 208         struct   slave __rcu *current_arp_slave;
 209         struct   slave __rcu *primary_slave;
 210         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
 211         bool     force_primary;
 212         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 213         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 214                               struct slave *);
 215         /* mode_lock is used for mode-specific locking needs, currently used by:
 216          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 217          *                bond_3ad_state_machine_handler() concurrently and also
 218          *                the access to the state machine shared variables.
 219          * TLB mode (5) - to sync the use and modifications of its hash table
 220          * ALB mode (6) - to sync the use and modifications of its hash table
 221          */
 222         spinlock_t mode_lock;
 223         spinlock_t stats_lock;
 224         u8       send_peer_notif;
 225         u8       igmp_retrans;
 226 #ifdef CONFIG_PROC_FS
 227         struct   proc_dir_entry *proc_entry;
 228         char     proc_file_name[IFNAMSIZ];
 229 #endif /* CONFIG_PROC_FS */
 230         struct   list_head bond_list;
 231         u32      rr_tx_counter;
 232         struct   ad_bond_info ad_info;
 233         struct   alb_bond_info alb_info;
 234         struct   bond_params params;
 235         struct   workqueue_struct *wq;
 236         struct   delayed_work mii_work;
 237         struct   delayed_work arp_work;
 238         struct   delayed_work alb_work;
 239         struct   delayed_work ad_work;
 240         struct   delayed_work mcast_work;
 241         struct   delayed_work slave_arr_work;
 242 #ifdef CONFIG_DEBUG_FS
 243         /* debugging support via debugfs */
 244         struct   dentry *debug_dir;
 245 #endif /* CONFIG_DEBUG_FS */
 246         struct rtnl_link_stats64 bond_stats;
 247 };
 248
 249 #define bond_slave_get_rcu(dev) \
 250         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 251
 252 #define bond_slave_get_rtnl(dev) \
 253         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 254
 255 void bond_queue_slave_event(struct slave *slave);
 256 void bond_lower_state_changed(struct slave *slave);
 257
 258 struct bond_vlan_tag {
 259         __be16          vlan_proto;
 260         unsigned short  vlan_id;
 261 };
 262
 263 /**
 264  * Returns NULL if the net_device does not belong to any of the bond's slaves
 265  *
 266  * Caller must hold bond lock for read
 267  */
 268 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 269                                                   struct net_device *slave_dev)
 270 {
 271         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 272 }
 273
 274 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 275 {
 276         return slave->bond;
 277 }
 278
 279 static inline bool bond_should_override_tx_queue(struct bonding *bond)
 280 {
 281         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
 282                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
 283 }
 284
 285 static inline bool bond_is_lb(const struct bonding *bond)
 286 {
 287         return BOND_MODE(bond) == BOND_MODE_TLB ||
 288                BOND_MODE(bond) == BOND_MODE_ALB;
 289 }
 290
 291 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 292 {
 293         return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
 294                (bond->params.tlb_dynamic_lb == 0);
 295 }
 296
 297 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
 298 {
 299         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 300                 BOND_MODE(bond) == BOND_MODE_XOR ||
 301                 bond_is_nondyn_tlb(bond));
 302 }
 303
 304 static inline bool bond_mode_uses_arp(int mode)
 305 {
 306         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
 307                mode != BOND_MODE_ALB;
 308 }
 309
 310 static inline bool bond_mode_uses_primary(int mode)
 311 {
 312         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
 313                mode == BOND_MODE_ALB;
 314 }
 315
 316 static inline bool bond_uses_primary(struct bonding *bond)
 317 {
 318         return bond_mode_uses_primary(BOND_MODE(bond));
 319 }
 320
 321 static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
 322 {
 323         struct slave *slave = rcu_dereference(bond->curr_active_slave);
 324
 325         return bond_uses_primary(bond) && slave ? slave->dev : NULL;
 326 }
 327
 328 static inline bool bond_slave_is_up(struct slave *slave)
 329 {
 330         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 331 }
 332
 333 static inline void bond_set_active_slave(struct slave *slave)
 334 {
 335         if (slave->backup) {
 336                 slave->backup = 0;
 337                 bond_queue_slave_event(slave);
 338                 bond_lower_state_changed(slave);
 339                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 340         }
 341 }
 342
 343 static inline void bond_set_backup_slave(struct slave *slave)
 344 {
 345         if (!slave->backup) {
 346                 slave->backup = 1;
 347                 bond_queue_slave_event(slave);
 348                 bond_lower_state_changed(slave);
 349                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 350         }
 351 }
 352
 353 static inline void bond_set_slave_state(struct slave *slave,
 354                                         int slave_state, bool notify)
 355 {
 356         if (slave->backup == slave_state)
 357                 return;
 358
 359         slave->backup = slave_state;
 360         if (notify) {
 361                 bond_lower_state_changed(slave);
 362                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 363                 bond_queue_slave_event(slave);
 364                 slave->should_notify = 0;
 365         } else {
 366                 if (slave->should_notify)
 367                         slave->should_notify = 0;
 368                 else
 369                         slave->should_notify = 1;
 370         }
 371 }
 372
 373 static inline void bond_slave_state_change(struct bonding *bond)
 374 {
 375         struct list_head *iter;
 376         struct slave *tmp;
 377
 378         bond_for_each_slave(bond, tmp, iter) {
 379                 if (tmp->link == BOND_LINK_UP)
 380                         bond_set_active_slave(tmp);
 381                 else if (tmp->link == BOND_LINK_DOWN)
 382                         bond_set_backup_slave(tmp);
 383         }
 384 }
 385
 386 static inline void bond_slave_state_notify(struct bonding *bond)
 387 {
 388         struct list_head *iter;
 389         struct slave *tmp;
 390
 391         bond_for_each_slave(bond, tmp, iter) {
 392                 if (tmp->should_notify) {
 393                         bond_lower_state_changed(tmp);
 394                         rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
 395                         tmp->should_notify = 0;
 396                 }
 397         }
 398 }
 399
 400 static inline int bond_slave_state(struct slave *slave)
 401 {
 402         return slave->backup;
 403 }
 404
 405 static inline bool bond_is_active_slave(struct slave *slave)
 406 {
 407         return !bond_slave_state(slave);
 408 }
 409
 410 static inline bool bond_slave_can_tx(struct slave *slave)
 411 {
 412         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 413                bond_is_active_slave(slave);
 414 }
 415
 416 #define BOND_PRI_RESELECT_ALWAYS        0
 417 #define BOND_PRI_RESELECT_BETTER        1
 418 #define BOND_PRI_RESELECT_FAILURE       2
 419
 420 #define BOND_FOM_NONE                   0
 421 #define BOND_FOM_ACTIVE                 1
 422 #define BOND_FOM_FOLLOW                 2
 423
 424 #define BOND_ARP_TARGETS_ANY            0
 425 #define BOND_ARP_TARGETS_ALL            1
 426
 427 #define BOND_ARP_VALIDATE_NONE          0
 428 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 429 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 430 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 431                                          BOND_ARP_VALIDATE_BACKUP)
 432 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
 433 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
 434                                          BOND_ARP_FILTER)
 435 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
 436                                          BOND_ARP_FILTER)
 437
 438 #define BOND_SLAVE_NOTIFY_NOW           true
 439 #define BOND_SLAVE_NOTIFY_LATER         false
 440
 441 static inline int slave_do_arp_validate(struct bonding *bond,
 442                                         struct slave *slave)
 443 {
 444         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 445 }
 446
 447 static inline int slave_do_arp_validate_only(struct bonding *bond)
 448 {
 449         return bond->params.arp_validate & BOND_ARP_FILTER;
 450 }
 451
 452 static inline int bond_is_ip_target_ok(__be32 addr)
 453 {
 454         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
 455 }
 456
 457 /* Get the oldest arp which we've received on this slave for bond's
 458  * arp_targets.
 459  */
 460 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 461                                                        struct slave *slave)
 462 {
 463         int i = 1;
 464         unsigned long ret = slave->target_last_arp_rx[0];
 465
 466         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 467                 if (time_before(slave->target_last_arp_rx[i], ret))
 468                         ret = slave->target_last_arp_rx[i];
 469
 470         return ret;
 471 }
 472
 473 static inline unsigned long slave_last_rx(struct bonding *bond,
 474                                         struct slave *slave)
 475 {
 476         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 477                 return slave_oldest_target_arp_rx(bond, slave);
 478
 479         return slave->last_rx;
 480 }
 481
 482 #ifdef CONFIG_NET_POLL_CONTROLLER
 483 static inline void bond_netpoll_send_skb(const struct slave *slave,
 484                                          struct sk_buff *skb)
 485 {
 486         struct netpoll *np = slave->np;
 487
 488         if (np)
 489                 netpoll_send_skb(np, skb);
 490 }
 491 #else
 492 static inline void bond_netpoll_send_skb(const struct slave *slave,
 493                                          struct sk_buff *skb)
 494 {
 495 }
 496 #endif
 497
 498 static inline void bond_set_slave_inactive_flags(struct slave *slave,
 499                                                  bool notify)
 500 {
 501         if (!bond_is_lb(slave->bond))
 502                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 503         if (!slave->bond->params.all_slaves_active)
 504                 slave->inactive = 1;
 505 }
 506
 507 static inline void bond_set_slave_active_flags(struct slave *slave,
 508                                                bool notify)
 509 {
 510         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
 511         slave->inactive = 0;
 512 }
 513
 514 static inline bool bond_is_slave_inactive(struct slave *slave)
 515 {
 516         return slave->inactive;
 517 }
 518
 519 static inline void bond_set_slave_link_state(struct slave *slave, int state,
 520                                              bool notify)
 521 {
 522         if (slave->link == state)
 523                 return;
 524
 525         slave->link = state;
 526         if (notify) {
 527                 bond_queue_slave_event(slave);
 528                 bond_lower_state_changed(slave);
 529                 slave->should_notify_link = 0;
 530         } else {
 531                 if (slave->should_notify_link)
 532                         slave->should_notify_link = 0;
 533                 else
 534                         slave->should_notify_link = 1;
 535         }
 536 }
 537
 538 static inline void bond_slave_link_notify(struct bonding *bond)
 539 {
 540         struct list_head *iter;
 541         struct slave *tmp;
 542
 543         bond_for_each_slave(bond, tmp, iter) {
 544                 if (tmp->should_notify_link) {
 545                         bond_queue_slave_event(tmp);
 546                         bond_lower_state_changed(tmp);
 547                         tmp->should_notify_link = 0;
 548                 }
 549         }
 550 }
 551
 552 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 553 {
 554         struct in_device *in_dev;
 555         __be32 addr = 0;
 556
 557         rcu_read_lock();
 558         in_dev = __in_dev_get_rcu(dev);
 559
 560         if (in_dev)
 561                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 562                                          RT_SCOPE_HOST);
 563         rcu_read_unlock();
 564         return addr;
 565 }
 566
 567 struct bond_net {
 568         struct net              *net;   /* Associated network namespace */
 569         struct list_head        dev_list;
 570 #ifdef CONFIG_PROC_FS
 571         struct proc_dir_entry   *proc_dir;
 572 #endif
 573         struct class_attribute  class_attr_bonding_masters;
 574 };
 575
 576 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 577 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 578 int bond_create(struct net *net, const char *name);
 579 int bond_create_sysfs(struct bond_net *net);
 580 void bond_destroy_sysfs(struct bond_net *net);
 581 void bond_prepare_sysfs_group(struct bonding *bond);
 582 int bond_sysfs_slave_add(struct slave *slave);
 583 void bond_sysfs_slave_del(struct slave *slave);
 584 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 585 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 586 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 587 int bond_set_carrier(struct bonding *bond);
 588 void bond_select_active_slave(struct bonding *bond);
 589 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 590 void bond_create_debugfs(void);
 591 void bond_destroy_debugfs(void);
 592 void bond_debug_register(struct bonding *bond);
 593 void bond_debug_unregister(struct bonding *bond);
 594 void bond_debug_reregister(struct bonding *bond);
 595 const char *bond_mode_name(int mode);
 596 void bond_setup(struct net_device *bond_dev);
 597 unsigned int bond_get_num_tx_queues(void);
 598 int bond_netlink_init(void);
 599 void bond_netlink_fini(void);
 600 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 601 const char *bond_slave_link_status(s8 link);
 602 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 603                                               struct net_device *end_dev,
 604                                               int level);
 605 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 606 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 607
 608 #ifdef CONFIG_PROC_FS
 609 void bond_create_proc_entry(struct bonding *bond);
 610 void bond_remove_proc_entry(struct bonding *bond);
 611 void bond_create_proc_dir(struct bond_net *bn);
 612 void bond_destroy_proc_dir(struct bond_net *bn);
 613 #else
 614 static inline void bond_create_proc_entry(struct bonding *bond)
 615 {
 616 }
 617
 618 static inline void bond_remove_proc_entry(struct bonding *bond)
 619 {
 620 }
 621
 622 static inline void bond_create_proc_dir(struct bond_net *bn)
 623 {
 624 }
 625
 626 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 627 {
 628 }
 629 #endif
 630
 631 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 632                                                const u8 *mac)
 633 {
 634         struct list_head *iter;
 635         struct slave *tmp;
 636
 637         bond_for_each_slave(bond, tmp, iter)
 638                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 639                         return tmp;
 640
 641         return NULL;
 642 }
 643
 644 /* Caller must hold rcu_read_lock() for read */
 645 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 646                                                const u8 *mac)
 647 {
 648         struct list_head *iter;
 649         struct slave *tmp;
 650
 651         bond_for_each_slave_rcu(bond, tmp, iter)
 652                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 653                         return tmp;
 654
 655         return NULL;
 656 }
 657
 658 /* Caller must hold rcu_read_lock() for read */
 659 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
 660 {
 661         struct list_head *iter;
 662         struct slave *tmp;
 663         struct netdev_hw_addr *ha;
 664
 665         bond_for_each_slave_rcu(bond, tmp, iter)
 666                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 667                         return true;
 668
 669         if (netdev_uc_empty(bond->dev))
 670                 return false;
 671
 672         netdev_for_each_uc_addr(ha, bond->dev)
 673                 if (ether_addr_equal_64bits(mac, ha->addr))
 674                         return true;
 675
 676         return false;
 677 }
 678
 679 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 680  * Returns -1 if not found, index if found
 681  */
 682 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 683 {
 684         int i;
 685
 686         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 687                 if (targets[i] == ip)
 688                         return i;
 689                 else if (targets[i] == 0)
 690                         break;
 691
 692         return -1;
 693 }
 694
 695 /* exported from bond_main.c */
 696 extern int bond_net_id;
 697 extern const struct bond_parm_tbl bond_lacp_tbl[];
 698 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 699 extern const struct bond_parm_tbl arp_validate_tbl[];
 700 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 701 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 702 extern const struct bond_parm_tbl pri_reselect_tbl[];
 703 extern struct bond_parm_tbl ad_select_tbl[];
 704
 705 /* exported from bond_netlink.c */
 706 extern struct rtnl_link_ops bond_link_ops;
 707
 708 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 709 {
 710         atomic_long_inc(&dev->tx_dropped);
 711         dev_kfree_skb_any(skb);
 712 }
 713
 714 #endif /* _NET_BONDING_H */