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 slave {
 143         struct net_device *dev; /* first - useful for panic debug */
 144         struct bonding *bond; /* our master */
 145         int    delay;
 146         /* all three in jiffies */
 147         unsigned long last_link_up;
 148         unsigned long last_rx;
 149         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 150         s8     link;            /* one of BOND_LINK_XXXX */
 151         s8     link_new_state;  /* one of BOND_LINK_XXXX */
 152         s8     new_link;
 153         u8     backup:1,   /* indicates backup slave. Value corresponds with
 154                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 155                inactive:1, /* indicates inactive slave */
 156                should_notify:1, /* indicates whether the state changed */
 157                should_notify_link:1; /* indicates whether the link changed */
 158         u8     duplex;
 159         u32    original_mtu;
 160         u32    link_failure_count;
 161         u32    speed;
 162         u16    queue_id;
 163         u8     perm_hwaddr[MAX_ADDR_LEN];
 164         struct ad_slave_info *ad_info;
 165         struct tlb_slave_info tlb_info;
 166 #ifdef CONFIG_NET_POLL_CONTROLLER
 167         struct netpoll *np;
 168 #endif
 169         struct delayed_work notify_work;
 170         struct kobject kobj;
 171         struct rtnl_link_stats64 slave_stats;
 172 };
 173
 174 struct bond_up_slave {
 175         unsigned int    count;
 176         struct rcu_head rcu;
 177         struct slave    *arr[0];
 178 };
 179
 180 /*
 181  * Link pseudo-state only used internally by monitors
 182  */
 183 #define BOND_LINK_NOCHANGE -1
 184
 185 /*
 186  * Here are the locking policies for the two bonding locks:
 187  * Get rcu_read_lock when reading or RTNL when writing slave list.
 188  */
 189 struct bonding {
 190         struct   net_device *dev; /* first - useful for panic debug */
 191         struct   slave __rcu *curr_active_slave;
 192         struct   slave __rcu *current_arp_slave;
 193         struct   slave __rcu *primary_slave;
 194         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
 195         bool     force_primary;
 196         u32      nest_level;
 197         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 198         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 199                               struct slave *);
 200         /* mode_lock is used for mode-specific locking needs, currently used by:
 201          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 202          *                bond_3ad_state_machine_handler() concurrently and also
 203          *                the access to the state machine shared variables.
 204          * TLB mode (5) - to sync the use and modifications of its hash table
 205          * ALB mode (6) - to sync the use and modifications of its hash table
 206          */
 207         spinlock_t mode_lock;
 208         spinlock_t stats_lock;
 209         u8       send_peer_notif;
 210         u8       igmp_retrans;
 211 #ifdef CONFIG_PROC_FS
 212         struct   proc_dir_entry *proc_entry;
 213         char     proc_file_name[IFNAMSIZ];
 214 #endif /* CONFIG_PROC_FS */
 215         struct   list_head bond_list;
 216         u32      rr_tx_counter;
 217         struct   ad_bond_info ad_info;
 218         struct   alb_bond_info alb_info;
 219         struct   bond_params params;
 220         struct   workqueue_struct *wq;
 221         struct   delayed_work mii_work;
 222         struct   delayed_work arp_work;
 223         struct   delayed_work alb_work;
 224         struct   delayed_work ad_work;
 225         struct   delayed_work mcast_work;
 226         struct   delayed_work slave_arr_work;
 227 #ifdef CONFIG_DEBUG_FS
 228         /* debugging support via debugfs */
 229         struct   dentry *debug_dir;
 230 #endif /* CONFIG_DEBUG_FS */
 231         struct rtnl_link_stats64 bond_stats;
 232 };
 233
 234 #define bond_slave_get_rcu(dev) \
 235         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 236
 237 #define bond_slave_get_rtnl(dev) \
 238         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 239
 240 void bond_queue_slave_event(struct slave *slave);
 241 void bond_lower_state_changed(struct slave *slave);
 242
 243 struct bond_vlan_tag {
 244         __be16          vlan_proto;
 245         unsigned short  vlan_id;
 246 };
 247
 248 /**
 249  * Returns NULL if the net_device does not belong to any of the bond's slaves
 250  *
 251  * Caller must hold bond lock for read
 252  */
 253 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 254                                                   struct net_device *slave_dev)
 255 {
 256         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 257 }
 258
 259 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 260 {
 261         return slave->bond;
 262 }
 263
 264 static inline bool bond_should_override_tx_queue(struct bonding *bond)
 265 {
 266         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
 267                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
 268 }
 269
 270 static inline bool bond_is_lb(const struct bonding *bond)
 271 {
 272         return BOND_MODE(bond) == BOND_MODE_TLB ||
 273                BOND_MODE(bond) == BOND_MODE_ALB;
 274 }
 275
 276 static inline bool bond_needs_speed_duplex(const struct bonding *bond)
 277 {
 278         return BOND_MODE(bond) == BOND_MODE_8023AD || bond_is_lb(bond);
 279 }
 280
 281 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 282 {
 283         return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
 284                (bond->params.tlb_dynamic_lb == 0);
 285 }
 286
 287 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
 288 {
 289         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 290                 BOND_MODE(bond) == BOND_MODE_XOR ||
 291                 bond_is_nondyn_tlb(bond));
 292 }
 293
 294 static inline bool bond_mode_uses_arp(int mode)
 295 {
 296         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
 297                mode != BOND_MODE_ALB;
 298 }
 299
 300 static inline bool bond_mode_uses_primary(int mode)
 301 {
 302         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
 303                mode == BOND_MODE_ALB;
 304 }
 305
 306 static inline bool bond_uses_primary(struct bonding *bond)
 307 {
 308         return bond_mode_uses_primary(BOND_MODE(bond));
 309 }
 310
 311 static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
 312 {
 313         struct slave *slave = rcu_dereference(bond->curr_active_slave);
 314
 315         return bond_uses_primary(bond) && slave ? slave->dev : NULL;
 316 }
 317
 318 static inline bool bond_slave_is_up(struct slave *slave)
 319 {
 320         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 321 }
 322
 323 static inline void bond_set_active_slave(struct slave *slave)
 324 {
 325         if (slave->backup) {
 326                 slave->backup = 0;
 327                 bond_queue_slave_event(slave);
 328                 bond_lower_state_changed(slave);
 329         }
 330 }
 331
 332 static inline void bond_set_backup_slave(struct slave *slave)
 333 {
 334         if (!slave->backup) {
 335                 slave->backup = 1;
 336                 bond_queue_slave_event(slave);
 337                 bond_lower_state_changed(slave);
 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                 bond_queue_slave_event(slave);
 351                 slave->should_notify = 0;
 352         } else {
 353                 if (slave->should_notify)
 354                         slave->should_notify = 0;
 355                 else
 356                         slave->should_notify = 1;
 357         }
 358 }
 359
 360 static inline void bond_slave_state_change(struct bonding *bond)
 361 {
 362         struct list_head *iter;
 363         struct slave *tmp;
 364
 365         bond_for_each_slave(bond, tmp, iter) {
 366                 if (tmp->link == BOND_LINK_UP)
 367                         bond_set_active_slave(tmp);
 368                 else if (tmp->link == BOND_LINK_DOWN)
 369                         bond_set_backup_slave(tmp);
 370         }
 371 }
 372
 373 static inline void bond_slave_state_notify(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->should_notify) {
 380                         bond_lower_state_changed(tmp);
 381                         tmp->should_notify = 0;
 382                 }
 383         }
 384 }
 385
 386 static inline int bond_slave_state(struct slave *slave)
 387 {
 388         return slave->backup;
 389 }
 390
 391 static inline bool bond_is_active_slave(struct slave *slave)
 392 {
 393         return !bond_slave_state(slave);
 394 }
 395
 396 static inline bool bond_slave_can_tx(struct slave *slave)
 397 {
 398         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 399                bond_is_active_slave(slave);
 400 }
 401
 402 static inline void bond_hw_addr_copy(u8 *dst, const u8 *src, unsigned int len)
 403 {
 404         if (len == ETH_ALEN) {
 405                 ether_addr_copy(dst, src);
 406                 return;
 407         }
 408
 409         memcpy(dst, src, len);
 410 }
 411
 412 #define BOND_PRI_RESELECT_ALWAYS        0
 413 #define BOND_PRI_RESELECT_BETTER        1
 414 #define BOND_PRI_RESELECT_FAILURE       2
 415
 416 #define BOND_FOM_NONE                   0
 417 #define BOND_FOM_ACTIVE                 1
 418 #define BOND_FOM_FOLLOW                 2
 419
 420 #define BOND_ARP_TARGETS_ANY            0
 421 #define BOND_ARP_TARGETS_ALL            1
 422
 423 #define BOND_ARP_VALIDATE_NONE          0
 424 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 425 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 426 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 427                                          BOND_ARP_VALIDATE_BACKUP)
 428 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
 429 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
 430                                          BOND_ARP_FILTER)
 431 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
 432                                          BOND_ARP_FILTER)
 433
 434 #define BOND_SLAVE_NOTIFY_NOW           true
 435 #define BOND_SLAVE_NOTIFY_LATER         false
 436
 437 static inline int slave_do_arp_validate(struct bonding *bond,
 438                                         struct slave *slave)
 439 {
 440         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 441 }
 442
 443 static inline int slave_do_arp_validate_only(struct bonding *bond)
 444 {
 445         return bond->params.arp_validate & BOND_ARP_FILTER;
 446 }
 447
 448 static inline int bond_is_ip_target_ok(__be32 addr)
 449 {
 450         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
 451 }
 452
 453 /* Get the oldest arp which we've received on this slave for bond's
 454  * arp_targets.
 455  */
 456 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 457                                                        struct slave *slave)
 458 {
 459         int i = 1;
 460         unsigned long ret = slave->target_last_arp_rx[0];
 461
 462         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 463                 if (time_before(slave->target_last_arp_rx[i], ret))
 464                         ret = slave->target_last_arp_rx[i];
 465
 466         return ret;
 467 }
 468
 469 static inline unsigned long slave_last_rx(struct bonding *bond,
 470                                         struct slave *slave)
 471 {
 472         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 473                 return slave_oldest_target_arp_rx(bond, slave);
 474
 475         return slave->last_rx;
 476 }
 477
 478 #ifdef CONFIG_NET_POLL_CONTROLLER
 479 static inline void bond_netpoll_send_skb(const struct slave *slave,
 480                                          struct sk_buff *skb)
 481 {
 482         struct netpoll *np = slave->np;
 483
 484         if (np)
 485                 netpoll_send_skb(np, skb);
 486 }
 487 #else
 488 static inline void bond_netpoll_send_skb(const struct slave *slave,
 489                                          struct sk_buff *skb)
 490 {
 491 }
 492 #endif
 493
 494 static inline void bond_set_slave_inactive_flags(struct slave *slave,
 495                                                  bool notify)
 496 {
 497         if (!bond_is_lb(slave->bond))
 498                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 499         if (!slave->bond->params.all_slaves_active)
 500                 slave->inactive = 1;
 501 }
 502
 503 static inline void bond_set_slave_active_flags(struct slave *slave,
 504                                                bool notify)
 505 {
 506         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
 507         slave->inactive = 0;
 508 }
 509
 510 static inline bool bond_is_slave_inactive(struct slave *slave)
 511 {
 512         return slave->inactive;
 513 }
 514
 515 static inline void bond_propose_link_state(struct slave *slave, int state)
 516 {
 517         slave->link_new_state = state;
 518 }
 519
 520 static inline void bond_commit_link_state(struct slave *slave, bool notify)
 521 {
 522         if (slave->link == slave->link_new_state)
 523                 return;
 524
 525         slave->link = slave->link_new_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_set_slave_link_state(struct slave *slave, int state,
 539                                              bool notify)
 540 {
 541         bond_propose_link_state(slave, state);
 542         bond_commit_link_state(slave, notify);
 543 }
 544
 545 static inline void bond_slave_link_notify(struct bonding *bond)
 546 {
 547         struct list_head *iter;
 548         struct slave *tmp;
 549
 550         bond_for_each_slave(bond, tmp, iter) {
 551                 if (tmp->should_notify_link) {
 552                         bond_queue_slave_event(tmp);
 553                         bond_lower_state_changed(tmp);
 554                         tmp->should_notify_link = 0;
 555                 }
 556         }
 557 }
 558
 559 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 560 {
 561         struct in_device *in_dev;
 562         __be32 addr = 0;
 563
 564         rcu_read_lock();
 565         in_dev = __in_dev_get_rcu(dev);
 566
 567         if (in_dev)
 568                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 569                                          RT_SCOPE_HOST);
 570         rcu_read_unlock();
 571         return addr;
 572 }
 573
 574 struct bond_net {
 575         struct net              *net;   /* Associated network namespace */
 576         struct list_head        dev_list;
 577 #ifdef CONFIG_PROC_FS
 578         struct proc_dir_entry   *proc_dir;
 579 #endif
 580         struct class_attribute  class_attr_bonding_masters;
 581 };
 582
 583 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 584 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 585 int bond_create(struct net *net, const char *name);
 586 int bond_create_sysfs(struct bond_net *net);
 587 void bond_destroy_sysfs(struct bond_net *net);
 588 void bond_prepare_sysfs_group(struct bonding *bond);
 589 int bond_sysfs_slave_add(struct slave *slave);
 590 void bond_sysfs_slave_del(struct slave *slave);
 591 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
 592                  struct netlink_ext_ack *extack);
 593 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 594 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 595 int bond_set_carrier(struct bonding *bond);
 596 void bond_select_active_slave(struct bonding *bond);
 597 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 598 void bond_create_debugfs(void);
 599 void bond_destroy_debugfs(void);
 600 void bond_debug_register(struct bonding *bond);
 601 void bond_debug_unregister(struct bonding *bond);
 602 void bond_debug_reregister(struct bonding *bond);
 603 const char *bond_mode_name(int mode);
 604 void bond_setup(struct net_device *bond_dev);
 605 unsigned int bond_get_num_tx_queues(void);
 606 int bond_netlink_init(void);
 607 void bond_netlink_fini(void);
 608 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 609 const char *bond_slave_link_status(s8 link);
 610 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 611                                               struct net_device *end_dev,
 612                                               int level);
 613 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 614 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 615 void bond_work_init_all(struct bonding *bond);
 616
 617 #ifdef CONFIG_PROC_FS
 618 void bond_create_proc_entry(struct bonding *bond);
 619 void bond_remove_proc_entry(struct bonding *bond);
 620 void bond_create_proc_dir(struct bond_net *bn);
 621 void bond_destroy_proc_dir(struct bond_net *bn);
 622 #else
 623 static inline void bond_create_proc_entry(struct bonding *bond)
 624 {
 625 }
 626
 627 static inline void bond_remove_proc_entry(struct bonding *bond)
 628 {
 629 }
 630
 631 static inline void bond_create_proc_dir(struct bond_net *bn)
 632 {
 633 }
 634
 635 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 636 {
 637 }
 638 #endif
 639
 640 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 641                                                const u8 *mac)
 642 {
 643         struct list_head *iter;
 644         struct slave *tmp;
 645
 646         bond_for_each_slave(bond, tmp, iter)
 647                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 648                         return tmp;
 649
 650         return NULL;
 651 }
 652
 653 /* Caller must hold rcu_read_lock() for read */
 654 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 655                                                const u8 *mac)
 656 {
 657         struct list_head *iter;
 658         struct slave *tmp;
 659
 660         bond_for_each_slave_rcu(bond, tmp, iter)
 661                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 662                         return tmp;
 663
 664         return NULL;
 665 }
 666
 667 /* Caller must hold rcu_read_lock() for read */
 668 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
 669 {
 670         struct list_head *iter;
 671         struct slave *tmp;
 672         struct netdev_hw_addr *ha;
 673
 674         bond_for_each_slave_rcu(bond, tmp, iter)
 675                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 676                         return true;
 677
 678         if (netdev_uc_empty(bond->dev))
 679                 return false;
 680
 681         netdev_for_each_uc_addr(ha, bond->dev)
 682                 if (ether_addr_equal_64bits(mac, ha->addr))
 683                         return true;
 684
 685         return false;
 686 }
 687
 688 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 689  * Returns -1 if not found, index if found
 690  */
 691 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 692 {
 693         int i;
 694
 695         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 696                 if (targets[i] == ip)
 697                         return i;
 698                 else if (targets[i] == 0)
 699                         break;
 700
 701         return -1;
 702 }
 703
 704 /* exported from bond_main.c */
 705 extern unsigned int bond_net_id;
 706 extern const struct bond_parm_tbl bond_lacp_tbl[];
 707 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 708 extern const struct bond_parm_tbl arp_validate_tbl[];
 709 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 710 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 711 extern const struct bond_parm_tbl pri_reselect_tbl[];
 712 extern struct bond_parm_tbl ad_select_tbl[];
 713
 714 /* exported from bond_netlink.c */
 715 extern struct rtnl_link_ops bond_link_ops;
 716
 717 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 718 {
 719         atomic_long_inc(&dev->tx_dropped);
 720         dev_kfree_skb_any(skb);
 721 }
 722
 723 #endif /* _NET_BONDING_H */