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     "3.7.1"
  28 #define DRV_RELDATE     "April 27, 2011"
  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 slave is ready for transmit.
  43  */
  44 #define SLAVE_IS_OK(slave)                              \
  45                     (((slave)->dev->flags & IFF_UP)  && \
  46                      netif_running((slave)->dev)     && \
  47                      ((slave)->link == BOND_LINK_UP) && \
  48                      bond_is_active_slave(slave))
  49
  50
  51 #define USES_PRIMARY(mode)                              \
  52                 (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  53                  ((mode) == BOND_MODE_TLB)          ||  \
  54                  ((mode) == BOND_MODE_ALB))
  55
  56 #define TX_QUEUE_OVERRIDE(mode)                         \
  57                         (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  58                          ((mode) == BOND_MODE_ROUNDROBIN))
  59 /*
  60  * Less bad way to call ioctl from within the kernel; this needs to be
  61  * done some other way to get the call out of interrupt context.
  62  * Needs "ioctl" variable to be supplied by calling context.
  63  */
  64 #define IOCTL(dev, arg, cmd) ({         \
  65         int res = 0;                    \
  66         mm_segment_t fs = get_fs();     \
  67         set_fs(get_ds());               \
  68         res = ioctl(dev, arg, cmd);     \
  69         set_fs(fs);                     \
  70         res; })
  71
  72 /**
  73  * bond_for_each_slave_from - iterate the slaves list from a starting point
  74  * @bond:       the bond holding this list.
  75  * @pos:        current slave.
  76  * @cnt:        counter for max number of moves
  77  * @start:      starting point.
  78  *
  79  * Caller must hold bond->lock
  80  */
  81 #define bond_for_each_slave_from(bond, pos, cnt, start) \
  82         for (cnt = 0, pos = start;                              \
  83              cnt < (bond)->slave_cnt;                           \
  84              cnt++, pos = (pos)->next)
  85
  86 /**
  87  * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
  88  * @bond:       the bond holding this list.
  89  * @pos:        current slave.
  90  * @cnt:        counter for number max of moves
  91  * @start:      start point.
  92  * @stop:       stop point.
  93  *
  94  * Caller must hold bond->lock
  95  */
  96 #define bond_for_each_slave_from_to(bond, pos, cnt, start, stop)        \
  97         for (cnt = 0, pos = start;                                      \
  98              ((cnt < (bond)->slave_cnt) && (pos != (stop)->next));      \
  99              cnt++, pos = (pos)->next)
 100
 101 /**
 102  * bond_for_each_slave - iterate the slaves list from head
 103  * @bond:       the bond holding this list.
 104  * @pos:        current slave.
 105  * @cnt:        counter for max number of moves
 106  *
 107  * Caller must hold bond->lock
 108  */
 109 #define bond_for_each_slave(bond, pos, cnt)     \
 110                 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
 111
 112
 113 #ifdef CONFIG_NET_POLL_CONTROLLER
 114 extern atomic_t netpoll_block_tx;
 115
 116 static inline void block_netpoll_tx(void)
 117 {
 118         atomic_inc(&netpoll_block_tx);
 119 }
 120
 121 static inline void unblock_netpoll_tx(void)
 122 {
 123         atomic_dec(&netpoll_block_tx);
 124 }
 125
 126 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 127 {
 128         if (unlikely(netpoll_tx_running(dev)))
 129                 return atomic_read(&netpoll_block_tx);
 130         return 0;
 131 }
 132 #else
 133 #define block_netpoll_tx()
 134 #define unblock_netpoll_tx()
 135 #define is_netpoll_tx_blocked(dev) (0)
 136 #endif
 137
 138 struct bond_params {
 139         int mode;
 140         int xmit_policy;
 141         int miimon;
 142         u8 num_peer_notif;
 143         int arp_interval;
 144         int arp_validate;
 145         int use_carrier;
 146         int fail_over_mac;
 147         int updelay;
 148         int downdelay;
 149         int lacp_fast;
 150         unsigned int min_links;
 151         int ad_select;
 152         char primary[IFNAMSIZ];
 153         int primary_reselect;
 154         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 155         int tx_queues;
 156         int all_slaves_active;
 157         int resend_igmp;
 158 };
 159
 160 struct bond_parm_tbl {
 161         char *modename;
 162         int mode;
 163 };
 164
 165 #define BOND_MAX_MODENAME_LEN 20
 166
 167 struct vlan_entry {
 168         struct list_head vlan_list;
 169         __be32 vlan_ip;
 170         unsigned short vlan_id;
 171 };
 172
 173 struct slave {
 174         struct net_device *dev; /* first - useful for panic debug */
 175         struct slave *next;
 176         struct slave *prev;
 177         struct bonding *bond; /* our master */
 178         int    delay;
 179         unsigned long jiffies;
 180         unsigned long last_arp_rx;
 181         s8     link;    /* one of BOND_LINK_XXXX */
 182         s8     new_link;
 183         u8     backup:1,   /* indicates backup slave. Value corresponds with
 184                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 185                inactive:1; /* indicates inactive slave */
 186         u8     duplex;
 187         u32    original_mtu;
 188         u32    link_failure_count;
 189         u32    speed;
 190         u16    queue_id;
 191         u8     perm_hwaddr[ETH_ALEN];
 192         struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
 193         struct tlb_slave_info tlb_info;
 194 #ifdef CONFIG_NET_POLL_CONTROLLER
 195         struct netpoll *np;
 196 #endif
 197 };
 198
 199 /*
 200  * Link pseudo-state only used internally by monitors
 201  */
 202 #define BOND_LINK_NOCHANGE -1
 203
 204 /*
 205  * Here are the locking policies for the two bonding locks:
 206  *
 207  * 1) Get bond->lock when reading/writing slave list.
 208  * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
 209  *    (It is unnecessary when the write-lock is put with bond->lock.)
 210  * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
 211  *    beforehand.
 212  */
 213 struct bonding {
 214         struct   net_device *dev; /* first - useful for panic debug */
 215         struct   slave *first_slave;
 216         struct   slave *curr_active_slave;
 217         struct   slave *current_arp_slave;
 218         struct   slave *primary_slave;
 219         bool     force_primary;
 220         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 221         void     (*recv_probe)(struct sk_buff *, struct bonding *,
 222                                struct slave *);
 223         rwlock_t lock;
 224         rwlock_t curr_slave_lock;
 225         s8       kill_timers;
 226         u8       send_peer_notif;
 227         s8       setup_by_slave;
 228         s8       igmp_retrans;
 229 #ifdef CONFIG_PROC_FS
 230         struct   proc_dir_entry *proc_entry;
 231         char     proc_file_name[IFNAMSIZ];
 232 #endif /* CONFIG_PROC_FS */
 233         struct   list_head bond_list;
 234         struct   netdev_hw_addr_list mc_list;
 235         int      (*xmit_hash_policy)(struct sk_buff *, int);
 236         __be32   master_ip;
 237         u16      rr_tx_counter;
 238         struct   ad_bond_info ad_info;
 239         struct   alb_bond_info alb_info;
 240         struct   bond_params params;
 241         struct   list_head vlan_list;
 242         struct   workqueue_struct *wq;
 243         struct   delayed_work mii_work;
 244         struct   delayed_work arp_work;
 245         struct   delayed_work alb_work;
 246         struct   delayed_work ad_work;
 247         struct   delayed_work mcast_work;
 248 #ifdef CONFIG_DEBUG_FS
 249         /* debugging suport via debugfs */
 250         struct   dentry *debug_dir;
 251 #endif /* CONFIG_DEBUG_FS */
 252 };
 253
 254 static inline bool bond_vlan_used(struct bonding *bond)
 255 {
 256         return !list_empty(&bond->vlan_list);
 257 }
 258
 259 #define bond_slave_get_rcu(dev) \
 260         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 261
 262 /**
 263  * Returns NULL if the net_device does not belong to any of the bond's slaves
 264  *
 265  * Caller must hold bond lock for read
 266  */
 267 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 268                                                   struct net_device *slave_dev)
 269 {
 270         struct slave *slave = NULL;
 271         int i;
 272
 273         bond_for_each_slave(bond, slave, i) {
 274                 if (slave->dev == slave_dev) {
 275                         return slave;
 276                 }
 277         }
 278
 279         return NULL;
 280 }
 281
 282 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 283 {
 284         if (!slave || !slave->dev->master) {
 285                 return NULL;
 286         }
 287
 288         return netdev_priv(slave->dev->master);
 289 }
 290
 291 static inline bool bond_is_lb(const struct bonding *bond)
 292 {
 293         return (bond->params.mode == BOND_MODE_TLB ||
 294                 bond->params.mode == BOND_MODE_ALB);
 295 }
 296
 297 static inline void bond_set_active_slave(struct slave *slave)
 298 {
 299         slave->backup = 0;
 300 }
 301
 302 static inline void bond_set_backup_slave(struct slave *slave)
 303 {
 304         slave->backup = 1;
 305 }
 306
 307 static inline int bond_slave_state(struct slave *slave)
 308 {
 309         return slave->backup;
 310 }
 311
 312 static inline bool bond_is_active_slave(struct slave *slave)
 313 {
 314         return !bond_slave_state(slave);
 315 }
 316
 317 #define BOND_PRI_RESELECT_ALWAYS        0
 318 #define BOND_PRI_RESELECT_BETTER        1
 319 #define BOND_PRI_RESELECT_FAILURE       2
 320
 321 #define BOND_FOM_NONE                   0
 322 #define BOND_FOM_ACTIVE                 1
 323 #define BOND_FOM_FOLLOW                 2
 324
 325 #define BOND_ARP_VALIDATE_NONE          0
 326 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 327 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 328 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 329                                          BOND_ARP_VALIDATE_BACKUP)
 330
 331 static inline int slave_do_arp_validate(struct bonding *bond,
 332                                         struct slave *slave)
 333 {
 334         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 335 }
 336
 337 static inline unsigned long slave_last_rx(struct bonding *bond,
 338                                         struct slave *slave)
 339 {
 340         if (slave_do_arp_validate(bond, slave))
 341                 return slave->last_arp_rx;
 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         struct bonding *bond = netdev_priv(slave->dev->master);
 365         if (!bond_is_lb(bond))
 366                 bond_set_backup_slave(slave);
 367         if (!bond->params.all_slaves_active)
 368                 slave->inactive = 1;
 369 }
 370
 371 static inline void bond_set_slave_active_flags(struct slave *slave)
 372 {
 373         bond_set_active_slave(slave);
 374         slave->inactive = 0;
 375 }
 376
 377 static inline bool bond_is_slave_inactive(struct slave *slave)
 378 {
 379         return slave->inactive;
 380 }
 381
 382 struct bond_net;
 383
 384 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
 385 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 386 int bond_create(struct net *net, const char *name);
 387 int bond_create_sysfs(struct bond_net *net);
 388 void bond_destroy_sysfs(struct bond_net *net);
 389 void bond_prepare_sysfs_group(struct bonding *bond);
 390 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
 391 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
 392 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 393 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 394 void bond_mii_monitor(struct work_struct *);
 395 void bond_loadbalance_arp_mon(struct work_struct *);
 396 void bond_activebackup_arp_mon(struct work_struct *);
 397 void bond_set_mode_ops(struct bonding *bond, int mode);
 398 int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
 399 void bond_select_active_slave(struct bonding *bond);
 400 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 401 void bond_create_debugfs(void);
 402 void bond_destroy_debugfs(void);
 403 void bond_debug_register(struct bonding *bond);
 404 void bond_debug_unregister(struct bonding *bond);
 405 void bond_debug_reregister(struct bonding *bond);
 406 const char *bond_mode_name(int mode);
 407
 408 struct bond_net {
 409         struct net *            net;    /* Associated network namespace */
 410         struct list_head        dev_list;
 411 #ifdef CONFIG_PROC_FS
 412         struct proc_dir_entry * proc_dir;
 413 #endif
 414         struct class_attribute  class_attr_bonding_masters;
 415 };
 416
 417 #ifdef CONFIG_PROC_FS
 418 void bond_create_proc_entry(struct bonding *bond);
 419 void bond_remove_proc_entry(struct bonding *bond);
 420 void bond_create_proc_dir(struct bond_net *bn);
 421 void bond_destroy_proc_dir(struct bond_net *bn);
 422 #else
 423 static inline void bond_create_proc_entry(struct bonding *bond)
 424 {
 425 }
 426
 427 static inline void bond_remove_proc_entry(struct bonding *bond)
 428 {
 429 }
 430
 431 static inline void bond_create_proc_dir(struct bond_net *bn)
 432 {
 433 }
 434
 435 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 436 {
 437 }
 438 #endif
 439
 440
 441 /* exported from bond_main.c */
 442 extern int bond_net_id;
 443 extern const struct bond_parm_tbl bond_lacp_tbl[];
 444 extern const struct bond_parm_tbl bond_mode_tbl[];
 445 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 446 extern const struct bond_parm_tbl arp_validate_tbl[];
 447 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 448 extern const struct bond_parm_tbl pri_reselect_tbl[];
 449 extern struct bond_parm_tbl ad_select_tbl[];
 450
 451 #endif /* _LINUX_BONDING_H */