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 "bond_3ad.h"
  25 #include "bond_alb.h"
  26
  27 #define DRV_VERSION     "3.7.0"
  28 #define DRV_RELDATE     "June 2, 2010"
  29 #define DRV_NAME        "bonding"
  30 #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
  31
  32 #define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
  33
  34 #define BOND_MAX_ARP_TARGETS    16
  35
  36 #define IS_UP(dev)                                         \
  37               ((((dev)->flags & IFF_UP) == IFF_UP)      && \
  38                netif_running(dev)                       && \
  39                netif_carrier_ok(dev))
  40
  41 /*
  42  * Checks whether bond is ready for transmit.
  43  *
  44  * Caller must hold bond->lock
  45  */
  46 #define BOND_IS_OK(bond)                             \
  47                    (((bond)->dev->flags & IFF_UP) && \
  48                     netif_running((bond)->dev)    && \
  49                     ((bond)->slave_cnt > 0))
  50
  51 /*
  52  * Checks whether slave is ready for transmit.
  53  */
  54 #define SLAVE_IS_OK(slave)                              \
  55                     (((slave)->dev->flags & IFF_UP)  && \
  56                      netif_running((slave)->dev)     && \
  57                      ((slave)->link == BOND_LINK_UP) && \
  58                      bond_is_active_slave(slave))
  59
  60
  61 #define USES_PRIMARY(mode)                              \
  62                 (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  63                  ((mode) == BOND_MODE_TLB)          ||  \
  64                  ((mode) == BOND_MODE_ALB))
  65
  66 #define TX_QUEUE_OVERRIDE(mode)                         \
  67                         (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  68                          ((mode) == BOND_MODE_ROUNDROBIN))
  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 /**
  83  * bond_for_each_slave_from - iterate the slaves list from a starting point
  84  * @bond:       the bond holding this list.
  85  * @pos:        current slave.
  86  * @cnt:        counter for max number of moves
  87  * @start:      starting point.
  88  *
  89  * Caller must hold bond->lock
  90  */
  91 #define bond_for_each_slave_from(bond, pos, cnt, start) \
  92         for (cnt = 0, pos = start;                              \
  93              cnt < (bond)->slave_cnt;                           \
  94              cnt++, pos = (pos)->next)
  95
  96 /**
  97  * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
  98  * @bond:       the bond holding this list.
  99  * @pos:        current slave.
 100  * @cnt:        counter for number max of moves
 101  * @start:      start point.
 102  * @stop:       stop point.
 103  *
 104  * Caller must hold bond->lock
 105  */
 106 #define bond_for_each_slave_from_to(bond, pos, cnt, start, stop)        \
 107         for (cnt = 0, pos = start;                                      \
 108              ((cnt < (bond)->slave_cnt) && (pos != (stop)->next));      \
 109              cnt++, pos = (pos)->next)
 110
 111 /**
 112  * bond_for_each_slave - iterate the slaves list from head
 113  * @bond:       the bond holding this list.
 114  * @pos:        current slave.
 115  * @cnt:        counter for max number of moves
 116  *
 117  * Caller must hold bond->lock
 118  */
 119 #define bond_for_each_slave(bond, pos, cnt)     \
 120                 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
 121
 122
 123 #ifdef CONFIG_NET_POLL_CONTROLLER
 124 extern atomic_t netpoll_block_tx;
 125
 126 static inline void block_netpoll_tx(void)
 127 {
 128         atomic_inc(&netpoll_block_tx);
 129 }
 130
 131 static inline void unblock_netpoll_tx(void)
 132 {
 133         atomic_dec(&netpoll_block_tx);
 134 }
 135
 136 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 137 {
 138         if (unlikely(netpoll_tx_running(dev)))
 139                 return atomic_read(&netpoll_block_tx);
 140         return 0;
 141 }
 142 #else
 143 #define block_netpoll_tx()
 144 #define unblock_netpoll_tx()
 145 #define is_netpoll_tx_blocked(dev) (0)
 146 #endif
 147
 148 struct bond_params {
 149         int mode;
 150         int xmit_policy;
 151         int miimon;
 152         int num_grat_arp;
 153         int num_unsol_na;
 154         int arp_interval;
 155         int arp_validate;
 156         int use_carrier;
 157         int fail_over_mac;
 158         int updelay;
 159         int downdelay;
 160         int lacp_fast;
 161         int ad_select;
 162         char primary[IFNAMSIZ];
 163         int primary_reselect;
 164         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 165         int tx_queues;
 166         int all_slaves_active;
 167         int resend_igmp;
 168 };
 169
 170 struct bond_parm_tbl {
 171         char *modename;
 172         int mode;
 173 };
 174
 175 #define BOND_MAX_MODENAME_LEN 20
 176
 177 struct vlan_entry {
 178         struct list_head vlan_list;
 179         __be32 vlan_ip;
 180         unsigned short vlan_id;
 181 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 182         struct in6_addr vlan_ipv6;
 183 #endif
 184 };
 185
 186 struct slave {
 187         struct net_device *dev; /* first - useful for panic debug */
 188         struct slave *next;
 189         struct slave *prev;
 190         struct bonding *bond; /* our master */
 191         int    delay;
 192         unsigned long jiffies;
 193         unsigned long last_arp_rx;
 194         s8     link;    /* one of BOND_LINK_XXXX */
 195         s8     new_link;
 196         u8     backup:1,   /* indicates backup slave. Value corresponds with
 197                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 198                inactive:1; /* indicates inactive slave */
 199         u32    original_mtu;
 200         u32    link_failure_count;
 201         u8     perm_hwaddr[ETH_ALEN];
 202         u16    speed;
 203         u8     duplex;
 204         u16    queue_id;
 205         struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
 206         struct tlb_slave_info tlb_info;
 207 #ifdef CONFIG_NET_POLL_CONTROLLER
 208         struct netpoll *np;
 209 #endif
 210 };
 211
 212 /*
 213  * Link pseudo-state only used internally by monitors
 214  */
 215 #define BOND_LINK_NOCHANGE -1
 216
 217 /*
 218  * Here are the locking policies for the two bonding locks:
 219  *
 220  * 1) Get bond->lock when reading/writing slave list.
 221  * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
 222  *    (It is unnecessary when the write-lock is put with bond->lock.)
 223  * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
 224  *    beforehand.
 225  */
 226 struct bonding {
 227         struct   net_device *dev; /* first - useful for panic debug */
 228         struct   slave *first_slave;
 229         struct   slave *curr_active_slave;
 230         struct   slave *current_arp_slave;
 231         struct   slave *primary_slave;
 232         bool     force_primary;
 233         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 234         rwlock_t lock;
 235         rwlock_t curr_slave_lock;
 236         s8       kill_timers;
 237         s8       send_grat_arp;
 238         s8       send_unsol_na;
 239         s8       setup_by_slave;
 240         s8       igmp_retrans;
 241 #ifdef CONFIG_PROC_FS
 242         struct   proc_dir_entry *proc_entry;
 243         char     proc_file_name[IFNAMSIZ];
 244 #endif /* CONFIG_PROC_FS */
 245         struct   list_head bond_list;
 246         struct   netdev_hw_addr_list mc_list;
 247         int      (*xmit_hash_policy)(struct sk_buff *, int);
 248         __be32   master_ip;
 249         u16      flags;
 250         u16      rr_tx_counter;
 251         struct   ad_bond_info ad_info;
 252         struct   alb_bond_info alb_info;
 253         struct   bond_params params;
 254         struct   list_head vlan_list;
 255         struct   vlan_group *vlgrp;
 256         struct   packet_type arp_mon_pt;
 257         struct   workqueue_struct *wq;
 258         struct   delayed_work mii_work;
 259         struct   delayed_work arp_work;
 260         struct   delayed_work alb_work;
 261         struct   delayed_work ad_work;
 262         struct   delayed_work mcast_work;
 263 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 264         struct   in6_addr master_ipv6;
 265 #endif
 266 #ifdef CONFIG_DEBUG_FS
 267         /* debugging suport via debugfs */
 268         struct   dentry *debug_dir;
 269 #endif /* CONFIG_DEBUG_FS */
 270 };
 271
 272 #define bond_slave_get_rcu(dev) \
 273         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 274
 275 /**
 276  * Returns NULL if the net_device does not belong to any of the bond's slaves
 277  *
 278  * Caller must hold bond lock for read
 279  */
 280 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 281                                                   struct net_device *slave_dev)
 282 {
 283         struct slave *slave = NULL;
 284         int i;
 285
 286         bond_for_each_slave(bond, slave, i) {
 287                 if (slave->dev == slave_dev) {
 288                         return slave;
 289                 }
 290         }
 291
 292         return NULL;
 293 }
 294
 295 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 296 {
 297         if (!slave || !slave->dev->master) {
 298                 return NULL;
 299         }
 300
 301         return netdev_priv(slave->dev->master);
 302 }
 303
 304 static inline bool bond_is_lb(const struct bonding *bond)
 305 {
 306         return (bond->params.mode == BOND_MODE_TLB ||
 307                 bond->params.mode == BOND_MODE_ALB);
 308 }
 309
 310 static inline void bond_set_active_slave(struct slave *slave)
 311 {
 312         slave->backup = 0;
 313 }
 314
 315 static inline void bond_set_backup_slave(struct slave *slave)
 316 {
 317         slave->backup = 1;
 318 }
 319
 320 static inline int bond_slave_state(struct slave *slave)
 321 {
 322         return slave->backup;
 323 }
 324
 325 static inline bool bond_is_active_slave(struct slave *slave)
 326 {
 327         return !bond_slave_state(slave);
 328 }
 329
 330 #define BOND_PRI_RESELECT_ALWAYS        0
 331 #define BOND_PRI_RESELECT_BETTER        1
 332 #define BOND_PRI_RESELECT_FAILURE       2
 333
 334 #define BOND_FOM_NONE                   0
 335 #define BOND_FOM_ACTIVE                 1
 336 #define BOND_FOM_FOLLOW                 2
 337
 338 #define BOND_ARP_VALIDATE_NONE          0
 339 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 340 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 341 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 342                                          BOND_ARP_VALIDATE_BACKUP)
 343
 344 static inline int slave_do_arp_validate(struct bonding *bond,
 345                                         struct slave *slave)
 346 {
 347         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 348 }
 349
 350 static inline unsigned long slave_last_rx(struct bonding *bond,
 351                                         struct slave *slave)
 352 {
 353         if (slave_do_arp_validate(bond, slave))
 354                 return slave->last_arp_rx;
 355
 356         return slave->dev->last_rx;
 357 }
 358
 359 #ifdef CONFIG_NET_POLL_CONTROLLER
 360 static inline void bond_netpoll_send_skb(const struct slave *slave,
 361                                          struct sk_buff *skb)
 362 {
 363         struct netpoll *np = slave->np;
 364
 365         if (np)
 366                 netpoll_send_skb(np, skb);
 367 }
 368 #else
 369 static inline void bond_netpoll_send_skb(const struct slave *slave,
 370                                          struct sk_buff *skb)
 371 {
 372 }
 373 #endif
 374
 375 static inline void bond_set_slave_inactive_flags(struct slave *slave)
 376 {
 377         struct bonding *bond = netdev_priv(slave->dev->master);
 378         if (!bond_is_lb(bond))
 379                 bond_set_backup_slave(slave);
 380         if (!bond->params.all_slaves_active)
 381                 slave->inactive = 1;
 382 }
 383
 384 static inline void bond_set_slave_active_flags(struct slave *slave)
 385 {
 386         bond_set_active_slave(slave);
 387         slave->inactive = 0;
 388 }
 389
 390 static inline bool bond_is_slave_inactive(struct slave *slave)
 391 {
 392         return slave->inactive;
 393 }
 394
 395 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
 396 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 397 int bond_create(struct net *net, const char *name);
 398 int bond_create_sysfs(void);
 399 void bond_destroy_sysfs(void);
 400 void bond_prepare_sysfs_group(struct bonding *bond);
 401 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
 402 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
 403 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 404 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 405 void bond_mii_monitor(struct work_struct *);
 406 void bond_loadbalance_arp_mon(struct work_struct *);
 407 void bond_activebackup_arp_mon(struct work_struct *);
 408 void bond_set_mode_ops(struct bonding *bond, int mode);
 409 int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
 410 void bond_select_active_slave(struct bonding *bond);
 411 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 412 void bond_register_arp(struct bonding *);
 413 void bond_unregister_arp(struct bonding *);
 414 void bond_create_debugfs(void);
 415 void bond_destroy_debugfs(void);
 416 void bond_debug_register(struct bonding *bond);
 417 void bond_debug_unregister(struct bonding *bond);
 418 void bond_debug_reregister(struct bonding *bond);
 419
 420 struct bond_net {
 421         struct net *            net;    /* Associated network namespace */
 422         struct list_head        dev_list;
 423 #ifdef CONFIG_PROC_FS
 424         struct proc_dir_entry * proc_dir;
 425 #endif
 426 };
 427
 428 #ifdef CONFIG_PROC_FS
 429 void bond_create_proc_entry(struct bonding *bond);
 430 void bond_remove_proc_entry(struct bonding *bond);
 431 void bond_create_proc_dir(struct bond_net *bn);
 432 void bond_destroy_proc_dir(struct bond_net *bn);
 433 #else
 434 static inline void bond_create_proc_entry(struct bonding *bond)
 435 {
 436 }
 437
 438 static inline void bond_remove_proc_entry(struct bonding *bond)
 439 {
 440 }
 441
 442 static inline void bond_create_proc_dir(struct bond_net *bn)
 443 {
 444 }
 445
 446 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 447 {
 448 }
 449 #endif
 450
 451
 452 /* exported from bond_main.c */
 453 extern int bond_net_id;
 454 extern const struct bond_parm_tbl bond_lacp_tbl[];
 455 extern const struct bond_parm_tbl bond_mode_tbl[];
 456 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 457 extern const struct bond_parm_tbl arp_validate_tbl[];
 458 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 459 extern const struct bond_parm_tbl pri_reselect_tbl[];
 460 extern struct bond_parm_tbl ad_select_tbl[];
 461
 462 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 463 void bond_send_unsolicited_na(struct bonding *bond);
 464 void bond_register_ipv6_notifier(void);
 465 void bond_unregister_ipv6_notifier(void);
 466 #else
 467 static inline void bond_send_unsolicited_na(struct bonding *bond)
 468 {
 469         return;
 470 }
 471 static inline void bond_register_ipv6_notifier(void)
 472 {
 473         return;
 474 }
 475 static inline void bond_unregister_ipv6_notifier(void)
 476 {
 477         return;
 478 }
 479 #endif
 480
 481 #endif /* _LINUX_BONDING_H */