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