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     link_new_state;  /* one of BOND_LINK_XXXX */
 158         s8     new_link;
 159         u8     backup:1,   /* indicates backup slave. Value corresponds with
 160                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 161                inactive:1, /* indicates inactive slave */
 162                should_notify:1, /* indicates whether the state changed */
 163                should_notify_link:1; /* indicates whether the link changed */
 164         u8     duplex;
 165         u32    original_mtu;
 166         u32    link_failure_count;
 167         u32    speed;
 168         u16    queue_id;
 169         u8     perm_hwaddr[MAX_ADDR_LEN];
 170         struct ad_slave_info *ad_info;
 171         struct tlb_slave_info tlb_info;
 172 #ifdef CONFIG_NET_POLL_CONTROLLER
 173         struct netpoll *np;
 174 #endif
 175         struct kobject kobj;
 176         struct rtnl_link_stats64 slave_stats;
 177 };
 178
 179 struct bond_up_slave {
 180         unsigned int    count;
 181         struct rcu_head rcu;
 182         struct slave    *arr[0];
 183 };
 184
 185 /*
 186  * Link pseudo-state only used internally by monitors
 187  */
 188 #define BOND_LINK_NOCHANGE -1
 189
 190 /*
 191  * Here are the locking policies for the two bonding locks:
 192  * Get rcu_read_lock when reading or RTNL when writing slave list.
 193  */
 194 struct bonding {
 195         struct   net_device *dev; /* first - useful for panic debug */
 196         struct   slave __rcu *curr_active_slave;
 197         struct   slave __rcu *current_arp_slave;
 198         struct   slave __rcu *primary_slave;
 199         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
 200         bool     force_primary;
 201         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 202         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 203                               struct slave *);
 204         /* mode_lock is used for mode-specific locking needs, currently used by:
 205          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 206          *                bond_3ad_state_machine_handler() concurrently and also
 207          *                the access to the state machine shared variables.
 208          * TLB mode (5) - to sync the use and modifications of its hash table
 209          * ALB mode (6) - to sync the use and modifications of its hash table
 210          */
 211         spinlock_t mode_lock;
 212         spinlock_t stats_lock;
 213         u8       send_peer_notif;
 214         u8       igmp_retrans;
 215 #ifdef CONFIG_PROC_FS
 216         struct   proc_dir_entry *proc_entry;
 217         char     proc_file_name[IFNAMSIZ];
 218 #endif /* CONFIG_PROC_FS */
 219         struct   list_head bond_list;
 220         u32      rr_tx_counter;
 221         struct   ad_bond_info ad_info;
 222         struct   alb_bond_info alb_info;
 223         struct   bond_params params;
 224         struct   workqueue_struct *wq;
 225         struct   delayed_work mii_work;
 226         struct   delayed_work arp_work;
 227         struct   delayed_work alb_work;
 228         struct   delayed_work ad_work;
 229         struct   delayed_work mcast_work;
 230         struct   delayed_work slave_arr_work;
 231 #ifdef CONFIG_DEBUG_FS
 232         /* debugging support via debugfs */
 233         struct   dentry *debug_dir;
 234 #endif /* CONFIG_DEBUG_FS */
 235         struct rtnl_link_stats64 bond_stats;
 236 };
 237
 238 #define bond_slave_get_rcu(dev) \
 239         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 240
 241 #define bond_slave_get_rtnl(dev) \
 242         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 243
 244 void bond_queue_slave_event(struct slave *slave);
 245 void bond_lower_state_changed(struct slave *slave);
 246
 247 struct bond_vlan_tag {
 248         __be16          vlan_proto;
 249         unsigned short  vlan_id;
 250 };
 251
 252 /**
 253  * Returns NULL if the net_device does not belong to any of the bond's slaves
 254  *
 255  * Caller must hold bond lock for read
 256  */
 257 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 258                                                   struct net_device *slave_dev)
 259 {
 260         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 261 }
 262
 263 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 264 {
 265         return slave->bond;
 266 }
 267
 268 static inline bool bond_should_override_tx_queue(struct bonding *bond)
 269 {
 270         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
 271                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
 272 }
 273
 274 static inline bool bond_is_lb(const struct bonding *bond)
 275 {
 276         return BOND_MODE(bond) == BOND_MODE_TLB ||
 277                BOND_MODE(bond) == BOND_MODE_ALB;
 278 }
 279
 280 static inline bool bond_needs_speed_duplex(const struct bonding *bond)
 281 {
 282         return BOND_MODE(bond) == BOND_MODE_8023AD || bond_is_lb(bond);
 283 }
 284
 285 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 286 {
 287         return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
 288                (bond->params.tlb_dynamic_lb == 0);
 289 }
 290
 291 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
 292 {
 293         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 294                 BOND_MODE(bond) == BOND_MODE_XOR ||
 295                 bond_is_nondyn_tlb(bond));
 296 }
 297
 298 static inline bool bond_mode_uses_arp(int mode)
 299 {
 300         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
 301                mode != BOND_MODE_ALB;
 302 }
 303
 304 static inline bool bond_mode_uses_primary(int mode)
 305 {
 306         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
 307                mode == BOND_MODE_ALB;
 308 }
 309
 310 static inline bool bond_uses_primary(struct bonding *bond)
 311 {
 312         return bond_mode_uses_primary(BOND_MODE(bond));
 313 }
 314
 315 static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
 316 {
 317         struct slave *slave = rcu_dereference(bond->curr_active_slave);
 318
 319         return bond_uses_primary(bond) && slave ? slave->dev : NULL;
 320 }
 321
 322 static inline bool bond_slave_is_up(struct slave *slave)
 323 {
 324         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 325 }
 326
 327 static inline void bond_set_active_slave(struct slave *slave)
 328 {
 329         if (slave->backup) {
 330                 slave->backup = 0;
 331                 bond_queue_slave_event(slave);
 332                 bond_lower_state_changed(slave);
 333         }
 334 }
 335
 336 static inline void bond_set_backup_slave(struct slave *slave)
 337 {
 338         if (!slave->backup) {
 339                 slave->backup = 1;
 340                 bond_queue_slave_event(slave);
 341                 bond_lower_state_changed(slave);
 342         }
 343 }
 344
 345 static inline void bond_set_slave_state(struct slave *slave,
 346                                         int slave_state, bool notify)
 347 {
 348         if (slave->backup == slave_state)
 349                 return;
 350
 351         slave->backup = slave_state;
 352         if (notify) {
 353                 bond_lower_state_changed(slave);
 354                 bond_queue_slave_event(slave);
 355                 slave->should_notify = 0;
 356         } else {
 357                 if (slave->should_notify)
 358                         slave->should_notify = 0;
 359                 else
 360                         slave->should_notify = 1;
 361         }
 362 }
 363
 364 static inline void bond_slave_state_change(struct bonding *bond)
 365 {
 366         struct list_head *iter;
 367         struct slave *tmp;
 368
 369         bond_for_each_slave(bond, tmp, iter) {
 370                 if (tmp->link == BOND_LINK_UP)
 371                         bond_set_active_slave(tmp);
 372                 else if (tmp->link == BOND_LINK_DOWN)
 373                         bond_set_backup_slave(tmp);
 374         }
 375 }
 376
 377 static inline void bond_slave_state_notify(struct bonding *bond)
 378 {
 379         struct list_head *iter;
 380         struct slave *tmp;
 381
 382         bond_for_each_slave(bond, tmp, iter) {
 383                 if (tmp->should_notify) {
 384                         bond_lower_state_changed(tmp);
 385                         tmp->should_notify = 0;
 386                 }
 387         }
 388 }
 389
 390 static inline int bond_slave_state(struct slave *slave)
 391 {
 392         return slave->backup;
 393 }
 394
 395 static inline bool bond_is_active_slave(struct slave *slave)
 396 {
 397         return !bond_slave_state(slave);
 398 }
 399
 400 static inline bool bond_slave_can_tx(struct slave *slave)
 401 {
 402         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 403                bond_is_active_slave(slave);
 404 }
 405
 406 static inline void bond_hw_addr_copy(u8 *dst, const u8 *src, unsigned int len)
 407 {
 408         if (len == ETH_ALEN) {
 409                 ether_addr_copy(dst, src);
 410                 return;
 411         }
 412
 413         memcpy(dst, src, len);
 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_propose_link_state(struct slave *slave, int state)
 520 {
 521         slave->link_new_state = state;
 522 }
 523
 524 static inline void bond_commit_link_state(struct slave *slave, bool notify)
 525 {
 526         if (slave->link == slave->link_new_state)
 527                 return;
 528
 529         slave->link = slave->link_new_state;
 530         if (notify) {
 531                 bond_queue_slave_event(slave);
 532                 bond_lower_state_changed(slave);
 533                 slave->should_notify_link = 0;
 534         } else {
 535                 if (slave->should_notify_link)
 536                         slave->should_notify_link = 0;
 537                 else
 538                         slave->should_notify_link = 1;
 539         }
 540 }
 541
 542 static inline void bond_set_slave_link_state(struct slave *slave, int state,
 543                                              bool notify)
 544 {
 545         bond_propose_link_state(slave, state);
 546         bond_commit_link_state(slave, notify);
 547 }
 548
 549 static inline void bond_slave_link_notify(struct bonding *bond)
 550 {
 551         struct list_head *iter;
 552         struct slave *tmp;
 553
 554         bond_for_each_slave(bond, tmp, iter) {
 555                 if (tmp->should_notify_link) {
 556                         bond_queue_slave_event(tmp);
 557                         bond_lower_state_changed(tmp);
 558                         tmp->should_notify_link = 0;
 559                 }
 560         }
 561 }
 562
 563 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 564 {
 565         struct in_device *in_dev;
 566         __be32 addr = 0;
 567
 568         rcu_read_lock();
 569         in_dev = __in_dev_get_rcu(dev);
 570
 571         if (in_dev)
 572                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 573                                          RT_SCOPE_HOST);
 574         rcu_read_unlock();
 575         return addr;
 576 }
 577
 578 struct bond_net {
 579         struct net              *net;   /* Associated network namespace */
 580         struct list_head        dev_list;
 581 #ifdef CONFIG_PROC_FS
 582         struct proc_dir_entry   *proc_dir;
 583 #endif
 584         struct class_attribute  class_attr_bonding_masters;
 585 };
 586
 587 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 588 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 589 int bond_create(struct net *net, const char *name);
 590 int bond_create_sysfs(struct bond_net *net);
 591 void bond_destroy_sysfs(struct bond_net *net);
 592 void bond_prepare_sysfs_group(struct bonding *bond);
 593 int bond_sysfs_slave_add(struct slave *slave);
 594 void bond_sysfs_slave_del(struct slave *slave);
 595 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
 596                  struct netlink_ext_ack *extack);
 597 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 598 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 599 int bond_set_carrier(struct bonding *bond);
 600 void bond_select_active_slave(struct bonding *bond);
 601 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 602 void bond_create_debugfs(void);
 603 void bond_destroy_debugfs(void);
 604 void bond_debug_register(struct bonding *bond);
 605 void bond_debug_unregister(struct bonding *bond);
 606 void bond_debug_reregister(struct bonding *bond);
 607 const char *bond_mode_name(int mode);
 608 void bond_setup(struct net_device *bond_dev);
 609 unsigned int bond_get_num_tx_queues(void);
 610 int bond_netlink_init(void);
 611 void bond_netlink_fini(void);
 612 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 613 const char *bond_slave_link_status(s8 link);
 614 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 615                                               struct net_device *end_dev,
 616                                               int level);
 617 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 618 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 619 void bond_work_init_all(struct bonding *bond);
 620
 621 #ifdef CONFIG_PROC_FS
 622 void bond_create_proc_entry(struct bonding *bond);
 623 void bond_remove_proc_entry(struct bonding *bond);
 624 void bond_create_proc_dir(struct bond_net *bn);
 625 void bond_destroy_proc_dir(struct bond_net *bn);
 626 #else
 627 static inline void bond_create_proc_entry(struct bonding *bond)
 628 {
 629 }
 630
 631 static inline void bond_remove_proc_entry(struct bonding *bond)
 632 {
 633 }
 634
 635 static inline void bond_create_proc_dir(struct bond_net *bn)
 636 {
 637 }
 638
 639 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 640 {
 641 }
 642 #endif
 643
 644 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 645                                                const u8 *mac)
 646 {
 647         struct list_head *iter;
 648         struct slave *tmp;
 649
 650         bond_for_each_slave(bond, tmp, iter)
 651                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 652                         return tmp;
 653
 654         return NULL;
 655 }
 656
 657 /* Caller must hold rcu_read_lock() for read */
 658 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 659                                                const u8 *mac)
 660 {
 661         struct list_head *iter;
 662         struct slave *tmp;
 663
 664         bond_for_each_slave_rcu(bond, tmp, iter)
 665                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 666                         return tmp;
 667
 668         return NULL;
 669 }
 670
 671 /* Caller must hold rcu_read_lock() for read */
 672 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
 673 {
 674         struct list_head *iter;
 675         struct slave *tmp;
 676         struct netdev_hw_addr *ha;
 677
 678         bond_for_each_slave_rcu(bond, tmp, iter)
 679                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 680                         return true;
 681
 682         if (netdev_uc_empty(bond->dev))
 683                 return false;
 684
 685         netdev_for_each_uc_addr(ha, bond->dev)
 686                 if (ether_addr_equal_64bits(mac, ha->addr))
 687                         return true;
 688
 689         return false;
 690 }
 691
 692 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 693  * Returns -1 if not found, index if found
 694  */
 695 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 696 {
 697         int i;
 698
 699         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 700                 if (targets[i] == ip)
 701                         return i;
 702                 else if (targets[i] == 0)
 703                         break;
 704
 705         return -1;
 706 }
 707
 708 /* exported from bond_main.c */
 709 extern unsigned int bond_net_id;
 710 extern const struct bond_parm_tbl bond_lacp_tbl[];
 711 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 712 extern const struct bond_parm_tbl arp_validate_tbl[];
 713 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 714 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 715 extern const struct bond_parm_tbl pri_reselect_tbl[];
 716 extern struct bond_parm_tbl ad_select_tbl[];
 717
 718 /* exported from bond_netlink.c */
 719 extern struct rtnl_link_ops bond_link_ops;
 720
 721 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 722 {
 723         atomic_long_inc(&dev->tx_dropped);
 724         dev_kfree_skb_any(skb);
 725 }
 726
 727 #endif /* _NET_BONDING_H */