drivers/net/bonding/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 _LINUX_BONDING_H
  16 #define _LINUX_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 "bond_3ad.h"
  27 #include "bond_alb.h"
  28
  29 #define DRV_VERSION     "3.7.1"
  30 #define DRV_RELDATE     "April 27, 2011"
  31 #define DRV_NAME        "bonding"
  32 #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
  33
  34 #define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
  35
  36 #define BOND_MAX_ARP_TARGETS    16
  37
  38 #define IS_UP(dev)                                         \
  39               ((((dev)->flags & IFF_UP) == IFF_UP)      && \
  40                netif_running(dev)                       && \
  41                netif_carrier_ok(dev))
  42
  43 /*
  44  * Checks whether slave is ready for transmit.
  45  */
  46 #define SLAVE_IS_OK(slave)                              \
  47                     (((slave)->dev->flags & IFF_UP)  && \
  48                      netif_running((slave)->dev)     && \
  49                      ((slave)->link == BOND_LINK_UP) && \
  50                      bond_is_active_slave(slave))
  51
  52
  53 #define USES_PRIMARY(mode)                              \
  54                 (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  55                  ((mode) == BOND_MODE_TLB)          ||  \
  56                  ((mode) == BOND_MODE_ALB))
  57
  58 #define TX_QUEUE_OVERRIDE(mode)                         \
  59                         (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  60                          ((mode) == BOND_MODE_ROUNDROBIN))
  61
  62 #define BOND_MODE_IS_LB(mode)                   \
  63                 (((mode) == BOND_MODE_TLB) ||   \
  64                  ((mode) == BOND_MODE_ALB))
  65
  66 #define IS_IP_TARGET_UNUSABLE_ADDRESS(a)        \
  67         ((htonl(INADDR_BROADCAST) == a) ||      \
  68          ipv4_is_zeronet(a))
  69 /*
  70  * Less bad way to call ioctl from within the kernel; this needs to be
  71  * done some other way to get the call out of interrupt context.
  72  * Needs "ioctl" variable to be supplied by calling context.
  73  */
  74 #define IOCTL(dev, arg, cmd) ({         \
  75         int res = 0;                    \
  76         mm_segment_t fs = get_fs();     \
  77         set_fs(get_ds());               \
  78         res = ioctl(dev, arg, cmd);     \
  79         set_fs(fs);                     \
  80         res; })
  81
  82 /* slave list primitives */
  83 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
  84
  85 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
  86
  87 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
  88 #define bond_first_slave(bond) \
  89         (bond_has_slaves(bond) ? \
  90                 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
  91                 NULL)
  92 #define bond_last_slave(bond) \
  93         (bond_has_slaves(bond) ? \
  94                 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
  95                 NULL)
  96
  97 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
  98 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
  99
 100 /**
 101  * bond_for_each_slave - iterate over all slaves
 102  * @bond:       the bond holding this list
 103  * @pos:        current slave
 104  * @iter:       list_head * iterator
 105  *
 106  * Caller must hold bond->lock
 107  */
 108 #define bond_for_each_slave(bond, pos, iter) \
 109         netdev_for_each_lower_private((bond)->dev, pos, iter)
 110
 111 /* Caller must have rcu_read_lock */
 112 #define bond_for_each_slave_rcu(bond, pos, iter) \
 113         netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
 114
 115 #ifdef CONFIG_NET_POLL_CONTROLLER
 116 extern atomic_t netpoll_block_tx;
 117
 118 static inline void block_netpoll_tx(void)
 119 {
 120         atomic_inc(&netpoll_block_tx);
 121 }
 122
 123 static inline void unblock_netpoll_tx(void)
 124 {
 125         atomic_dec(&netpoll_block_tx);
 126 }
 127
 128 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 129 {
 130         if (unlikely(netpoll_tx_running(dev)))
 131                 return atomic_read(&netpoll_block_tx);
 132         return 0;
 133 }
 134 #else
 135 #define block_netpoll_tx()
 136 #define unblock_netpoll_tx()
 137 #define is_netpoll_tx_blocked(dev) (0)
 138 #endif
 139
 140 struct bond_params {
 141         int mode;
 142         int xmit_policy;
 143         int miimon;
 144         u8 num_peer_notif;
 145         int arp_interval;
 146         int arp_validate;
 147         int arp_all_targets;
 148         int use_carrier;
 149         int fail_over_mac;
 150         int updelay;
 151         int downdelay;
 152         int lacp_fast;
 153         unsigned int min_links;
 154         int ad_select;
 155         char primary[IFNAMSIZ];
 156         int primary_reselect;
 157         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 158         int tx_queues;
 159         int all_slaves_active;
 160         int resend_igmp;
 161         int lp_interval;
 162         int packets_per_slave;
 163 };
 164
 165 struct bond_parm_tbl {
 166         char *modename;
 167         int mode;
 168 };
 169
 170 #define BOND_MAX_MODENAME_LEN 20
 171
 172 struct slave {
 173         struct net_device *dev; /* first - useful for panic debug */
 174         struct bonding *bond; /* our master */
 175         int    delay;
 176         unsigned long jiffies;
 177         unsigned long last_arp_rx;
 178         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 179         s8     link;    /* one of BOND_LINK_XXXX */
 180         s8     new_link;
 181         u8     backup:1,   /* indicates backup slave. Value corresponds with
 182                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 183                inactive:1; /* indicates inactive slave */
 184         u8     duplex;
 185         u32    original_mtu;
 186         u32    link_failure_count;
 187         u32    speed;
 188         u16    queue_id;
 189         u8     perm_hwaddr[ETH_ALEN];
 190         struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
 191         struct tlb_slave_info tlb_info;
 192 #ifdef CONFIG_NET_POLL_CONTROLLER
 193         struct netpoll *np;
 194 #endif
 195 };
 196
 197 /*
 198  * Link pseudo-state only used internally by monitors
 199  */
 200 #define BOND_LINK_NOCHANGE -1
 201
 202 /*
 203  * Here are the locking policies for the two bonding locks:
 204  *
 205  * 1) Get bond->lock when reading/writing slave list.
 206  * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
 207  *    (It is unnecessary when the write-lock is put with bond->lock.)
 208  * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
 209  *    beforehand.
 210  */
 211 struct bonding {
 212         struct   net_device *dev; /* first - useful for panic debug */
 213         struct   slave *curr_active_slave;
 214         struct   slave *current_arp_slave;
 215         struct   slave *primary_slave;
 216         bool     force_primary;
 217         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 218         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 219                               struct slave *);
 220         rwlock_t lock;
 221         rwlock_t curr_slave_lock;
 222         u8       send_peer_notif;
 223         u8       igmp_retrans;
 224 #ifdef CONFIG_PROC_FS
 225         struct   proc_dir_entry *proc_entry;
 226         char     proc_file_name[IFNAMSIZ];
 227 #endif /* CONFIG_PROC_FS */
 228         struct   list_head bond_list;
 229         u32      rr_tx_counter;
 230         struct   ad_bond_info ad_info;
 231         struct   alb_bond_info alb_info;
 232         struct   bond_params params;
 233         struct   workqueue_struct *wq;
 234         struct   delayed_work mii_work;
 235         struct   delayed_work arp_work;
 236         struct   delayed_work alb_work;
 237         struct   delayed_work ad_work;
 238         struct   delayed_work mcast_work;
 239 #ifdef CONFIG_DEBUG_FS
 240         /* debugging support via debugfs */
 241         struct   dentry *debug_dir;
 242 #endif /* CONFIG_DEBUG_FS */
 243 };
 244
 245 #define bond_slave_get_rcu(dev) \
 246         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 247
 248 #define bond_slave_get_rtnl(dev) \
 249         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 250
 251 /**
 252  * Returns NULL if the net_device does not belong to any of the bond's slaves
 253  *
 254  * Caller must hold bond lock for read
 255  */
 256 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 257                                                   struct net_device *slave_dev)
 258 {
 259         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 260 }
 261
 262 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 263 {
 264         if (!slave || !slave->bond)
 265                 return NULL;
 266         return slave->bond;
 267 }
 268
 269 static inline bool bond_is_lb(const struct bonding *bond)
 270 {
 271         return BOND_MODE_IS_LB(bond->params.mode);
 272 }
 273
 274 static inline void bond_set_active_slave(struct slave *slave)
 275 {
 276         slave->backup = 0;
 277 }
 278
 279 static inline void bond_set_backup_slave(struct slave *slave)
 280 {
 281         slave->backup = 1;
 282 }
 283
 284 static inline int bond_slave_state(struct slave *slave)
 285 {
 286         return slave->backup;
 287 }
 288
 289 static inline bool bond_is_active_slave(struct slave *slave)
 290 {
 291         return !bond_slave_state(slave);
 292 }
 293
 294 #define BOND_PRI_RESELECT_ALWAYS        0
 295 #define BOND_PRI_RESELECT_BETTER        1
 296 #define BOND_PRI_RESELECT_FAILURE       2
 297
 298 #define BOND_FOM_NONE                   0
 299 #define BOND_FOM_ACTIVE                 1
 300 #define BOND_FOM_FOLLOW                 2
 301
 302 #define BOND_ARP_TARGETS_ANY            0
 303 #define BOND_ARP_TARGETS_ALL            1
 304
 305 #define BOND_ARP_VALIDATE_NONE          0
 306 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 307 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 308 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 309                                          BOND_ARP_VALIDATE_BACKUP)
 310
 311 static inline int slave_do_arp_validate(struct bonding *bond,
 312                                         struct slave *slave)
 313 {
 314         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 315 }
 316
 317 /* Get the oldest arp which we've received on this slave for bond's
 318  * arp_targets.
 319  */
 320 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 321                                                        struct slave *slave)
 322 {
 323         int i = 1;
 324         unsigned long ret = slave->target_last_arp_rx[0];
 325
 326         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 327                 if (time_before(slave->target_last_arp_rx[i], ret))
 328                         ret = slave->target_last_arp_rx[i];
 329
 330         return ret;
 331 }
 332
 333 static inline unsigned long slave_last_rx(struct bonding *bond,
 334                                         struct slave *slave)
 335 {
 336         if (slave_do_arp_validate(bond, slave)) {
 337                 if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 338                         return slave_oldest_target_arp_rx(bond, slave);
 339                 else
 340                         return slave->last_arp_rx;
 341         }
 342
 343         return slave->dev->last_rx;
 344 }
 345
 346 #ifdef CONFIG_NET_POLL_CONTROLLER
 347 static inline void bond_netpoll_send_skb(const struct slave *slave,
 348                                          struct sk_buff *skb)
 349 {
 350         struct netpoll *np = slave->np;
 351
 352         if (np)
 353                 netpoll_send_skb(np, skb);
 354 }
 355 #else
 356 static inline void bond_netpoll_send_skb(const struct slave *slave,
 357                                          struct sk_buff *skb)
 358 {
 359 }
 360 #endif
 361
 362 static inline void bond_set_slave_inactive_flags(struct slave *slave)
 363 {
 364         if (!bond_is_lb(slave->bond))
 365                 bond_set_backup_slave(slave);
 366         if (!slave->bond->params.all_slaves_active)
 367                 slave->inactive = 1;
 368 }
 369
 370 static inline void bond_set_slave_active_flags(struct slave *slave)
 371 {
 372         bond_set_active_slave(slave);
 373         slave->inactive = 0;
 374 }
 375
 376 static inline bool bond_is_slave_inactive(struct slave *slave)
 377 {
 378         return slave->inactive;
 379 }
 380
 381 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 382 {
 383         struct in_device *in_dev;
 384         __be32 addr = 0;
 385
 386         rcu_read_lock();
 387         in_dev = __in_dev_get_rcu(dev);
 388
 389         if (in_dev)
 390                 addr = inet_confirm_addr(in_dev, dst, local, RT_SCOPE_HOST);
 391
 392         rcu_read_unlock();
 393         return addr;
 394 }
 395
 396 static inline bool slave_can_tx(struct slave *slave)
 397 {
 398         if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP &&
 399             bond_is_active_slave(slave))
 400                 return true;
 401         else
 402                 return false;
 403 }
 404
 405 struct bond_net;
 406
 407 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 408 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 409 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id);
 410 int bond_create(struct net *net, const char *name);
 411 int bond_create_sysfs(struct bond_net *net);
 412 void bond_destroy_sysfs(struct bond_net *net);
 413 void bond_prepare_sysfs_group(struct bonding *bond);
 414 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 415 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 416 void bond_mii_monitor(struct work_struct *);
 417 void bond_loadbalance_arp_mon(struct work_struct *);
 418 void bond_activebackup_arp_mon(struct work_struct *);
 419 int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count);
 420 int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
 421 void bond_select_active_slave(struct bonding *bond);
 422 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 423 void bond_create_debugfs(void);
 424 void bond_destroy_debugfs(void);
 425 void bond_debug_register(struct bonding *bond);
 426 void bond_debug_unregister(struct bonding *bond);
 427 void bond_debug_reregister(struct bonding *bond);
 428 const char *bond_mode_name(int mode);
 429 void bond_setup(struct net_device *bond_dev);
 430 unsigned int bond_get_num_tx_queues(void);
 431 int bond_netlink_init(void);
 432 void bond_netlink_fini(void);
 433 int bond_option_mode_set(struct bonding *bond, int mode);
 434 int bond_option_active_slave_set(struct bonding *bond, struct net_device *slave_dev);
 435 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 436 struct net_device *bond_option_active_slave_get(struct bonding *bond);
 437
 438 struct bond_net {
 439         struct net *            net;    /* Associated network namespace */
 440         struct list_head        dev_list;
 441 #ifdef CONFIG_PROC_FS
 442         struct proc_dir_entry * proc_dir;
 443 #endif
 444         struct class_attribute  class_attr_bonding_masters;
 445 };
 446
 447 #ifdef CONFIG_PROC_FS
 448 void bond_create_proc_entry(struct bonding *bond);
 449 void bond_remove_proc_entry(struct bonding *bond);
 450 void bond_create_proc_dir(struct bond_net *bn);
 451 void bond_destroy_proc_dir(struct bond_net *bn);
 452 #else
 453 static inline void bond_create_proc_entry(struct bonding *bond)
 454 {
 455 }
 456
 457 static inline void bond_remove_proc_entry(struct bonding *bond)
 458 {
 459 }
 460
 461 static inline void bond_create_proc_dir(struct bond_net *bn)
 462 {
 463 }
 464
 465 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 466 {
 467 }
 468 #endif
 469
 470 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 471                                                const u8 *mac)
 472 {
 473         struct list_head *iter;
 474         struct slave *tmp;
 475
 476         bond_for_each_slave(bond, tmp, iter)
 477                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 478                         return tmp;
 479
 480         return NULL;
 481 }
 482
 483 /* Caller must hold rcu_read_lock() for read */
 484 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 485                                                const u8 *mac)
 486 {
 487         struct list_head *iter;
 488         struct slave *tmp;
 489
 490         bond_for_each_slave_rcu(bond, tmp, iter)
 491                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 492                         return tmp;
 493
 494         return NULL;
 495 }
 496
 497 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 498  * Returns -1 if not found, index if found
 499  */
 500 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 501 {
 502         int i;
 503
 504         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 505                 if (targets[i] == ip)
 506                         return i;
 507                 else if (targets[i] == 0)
 508                         break;
 509
 510         return -1;
 511 }
 512
 513 /* exported from bond_main.c */
 514 extern int bond_net_id;
 515 extern const struct bond_parm_tbl bond_lacp_tbl[];
 516 extern const struct bond_parm_tbl bond_mode_tbl[];
 517 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 518 extern const struct bond_parm_tbl arp_validate_tbl[];
 519 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 520 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 521 extern const struct bond_parm_tbl pri_reselect_tbl[];
 522 extern struct bond_parm_tbl ad_select_tbl[];
 523
 524 /* exported from bond_netlink.c */
 525 extern struct rtnl_link_ops bond_link_ops;
 526
 527 #endif /* _LINUX_BONDING_H */