2 * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
4 * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
5 * NCM: Network and Communications Management, Inc.
7 * BUT, I'm the one who modified it for ethernet, so:
8 * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
10 * This software may be used and distributed according to the terms
11 * of the GNU Public License, incorporated herein by reference.
15 #ifndef _LINUX_BONDING_H
16 #define _LINUX_BONDING_H
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>
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"
34 #define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
36 #define BOND_MAX_ARP_TARGETS 16
39 ((((dev)->flags & IFF_UP) == IFF_UP) && \
40 netif_running(dev) && \
41 netif_carrier_ok(dev))
44 * Checks whether slave is ready for transmit.
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))
53 #define USES_PRIMARY(mode) \
54 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
55 ((mode) == BOND_MODE_TLB) || \
56 ((mode) == BOND_MODE_ALB))
58 #define TX_QUEUE_OVERRIDE(mode) \
59 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
60 ((mode) == BOND_MODE_ROUNDROBIN))
62 * Less bad way to call ioctl from within the kernel; this needs to be
63 * done some other way to get the call out of interrupt context.
64 * Needs "ioctl" variable to be supplied by calling context.
66 #define IOCTL(dev, arg, cmd) ({ \
68 mm_segment_t fs = get_fs(); \
70 res = ioctl(dev, arg, cmd); \
74 /* slave list primitives */
75 #define bond_to_slave(ptr) list_entry(ptr, struct slave, list)
77 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
78 #define bond_first_slave(bond) \
79 list_first_entry_or_null(&(bond)->slave_list, struct slave, list)
80 #define bond_last_slave(bond) \
81 (list_empty(&(bond)->slave_list) ? NULL : \
82 bond_to_slave((bond)->slave_list.prev))
84 #define bond_is_first_slave(bond, pos) ((pos)->list.prev == &(bond)->slave_list)
85 #define bond_is_last_slave(bond, pos) ((pos)->list.next == &(bond)->slave_list)
87 /* Since bond_first/last_slave can return NULL, these can return NULL too */
88 #define bond_next_slave(bond, pos) \
89 (bond_is_last_slave(bond, pos) ? bond_first_slave(bond) : \
90 bond_to_slave((pos)->list.next))
92 #define bond_prev_slave(bond, pos) \
93 (bond_is_first_slave(bond, pos) ? bond_last_slave(bond) : \
94 bond_to_slave((pos)->list.prev))
97 * bond_for_each_slave_from - iterate the slaves list from a starting point
98 * @bond: the bond holding this list.
99 * @pos: current slave.
100 * @cnt: counter for max number of moves
101 * @start: starting point.
103 * Caller must hold bond->lock
105 #define bond_for_each_slave_from(bond, pos, cnt, start) \
106 for (cnt = 0, pos = start; pos && cnt < (bond)->slave_cnt; \
107 cnt++, pos = bond_next_slave(bond, pos))
110 * bond_for_each_slave - iterate over all slaves
111 * @bond: the bond holding this list
112 * @pos: current slave
114 * Caller must hold bond->lock
116 #define bond_for_each_slave(bond, pos) \
117 list_for_each_entry(pos, &(bond)->slave_list, list)
119 /* Caller must have rcu_read_lock */
120 #define bond_for_each_slave_rcu(bond, pos) \
121 list_for_each_entry_rcu(pos, &(bond)->slave_list, list)
124 * bond_for_each_slave_reverse - iterate in reverse from a given position
125 * @bond: the bond holding this list
126 * @pos: slave to continue from
128 * Caller must hold bond->lock
130 #define bond_for_each_slave_continue_reverse(bond, pos) \
131 list_for_each_entry_continue_reverse(pos, &(bond)->slave_list, list)
133 #ifdef CONFIG_NET_POLL_CONTROLLER
134 extern atomic_t netpoll_block_tx;
136 static inline void block_netpoll_tx(void)
138 atomic_inc(&netpoll_block_tx);
141 static inline void unblock_netpoll_tx(void)
143 atomic_dec(&netpoll_block_tx);
146 static inline int is_netpoll_tx_blocked(struct net_device *dev)
148 if (unlikely(netpoll_tx_running(dev)))
149 return atomic_read(&netpoll_block_tx);
153 #define block_netpoll_tx()
154 #define unblock_netpoll_tx()
155 #define is_netpoll_tx_blocked(dev) (0)
171 unsigned int min_links;
173 char primary[IFNAMSIZ];
174 int primary_reselect;
175 __be32 arp_targets[BOND_MAX_ARP_TARGETS];
177 int all_slaves_active;
181 struct bond_parm_tbl {
186 #define BOND_MAX_MODENAME_LEN 20
189 struct net_device *dev; /* first - useful for panic debug */
190 struct list_head list;
191 struct bonding *bond; /* our master */
193 unsigned long jiffies;
194 unsigned long last_arp_rx;
195 unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
196 s8 link; /* one of BOND_LINK_XXXX */
198 u8 backup:1, /* indicates backup slave. Value corresponds with
199 BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
200 inactive:1; /* indicates inactive slave */
203 u32 link_failure_count;
206 u8 perm_hwaddr[ETH_ALEN];
207 struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
208 struct tlb_slave_info tlb_info;
209 #ifdef CONFIG_NET_POLL_CONTROLLER
215 * Link pseudo-state only used internally by monitors
217 #define BOND_LINK_NOCHANGE -1
220 * Here are the locking policies for the two bonding locks:
222 * 1) Get bond->lock when reading/writing slave list.
223 * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
224 * (It is unnecessary when the write-lock is put with bond->lock.)
225 * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
229 struct net_device *dev; /* first - useful for panic debug */
230 struct list_head slave_list;
231 struct slave *curr_active_slave;
232 struct slave *current_arp_slave;
233 struct slave *primary_slave;
235 s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
236 int (*recv_probe)(const struct sk_buff *, struct bonding *,
239 rwlock_t curr_slave_lock;
242 #ifdef CONFIG_PROC_FS
243 struct proc_dir_entry *proc_entry;
244 char proc_file_name[IFNAMSIZ];
245 #endif /* CONFIG_PROC_FS */
246 struct list_head bond_list;
247 int (*xmit_hash_policy)(struct sk_buff *, int);
249 struct ad_bond_info ad_info;
250 struct alb_bond_info alb_info;
251 struct bond_params params;
252 struct workqueue_struct *wq;
253 struct delayed_work mii_work;
254 struct delayed_work arp_work;
255 struct delayed_work alb_work;
256 struct delayed_work ad_work;
257 struct delayed_work mcast_work;
258 #ifdef CONFIG_DEBUG_FS
259 /* debugging support via debugfs */
260 struct dentry *debug_dir;
261 #endif /* CONFIG_DEBUG_FS */
264 /* if we hold rtnl_lock() - call vlan_uses_dev() */
265 static inline bool bond_vlan_used(struct bonding *bond)
267 struct net_device *upper;
268 struct list_head *iter;
271 netdev_for_each_upper_dev_rcu(bond->dev, upper, iter) {
272 if (upper->priv_flags & IFF_802_1Q_VLAN) {
282 #define bond_slave_get_rcu(dev) \
283 ((struct slave *) rcu_dereference(dev->rx_handler_data))
285 #define bond_slave_get_rtnl(dev) \
286 ((struct slave *) rtnl_dereference(dev->rx_handler_data))
289 * Returns NULL if the net_device does not belong to any of the bond's slaves
291 * Caller must hold bond lock for read
293 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
294 struct net_device *slave_dev)
296 struct slave *slave = NULL;
298 bond_for_each_slave(bond, slave)
299 if (slave->dev == slave_dev)
305 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
307 if (!slave || !slave->bond)
312 static inline bool bond_is_lb(const struct bonding *bond)
314 return (bond->params.mode == BOND_MODE_TLB ||
315 bond->params.mode == BOND_MODE_ALB);
318 static inline void bond_set_active_slave(struct slave *slave)
323 static inline void bond_set_backup_slave(struct slave *slave)
328 static inline int bond_slave_state(struct slave *slave)
330 return slave->backup;
333 static inline bool bond_is_active_slave(struct slave *slave)
335 return !bond_slave_state(slave);
338 #define BOND_PRI_RESELECT_ALWAYS 0
339 #define BOND_PRI_RESELECT_BETTER 1
340 #define BOND_PRI_RESELECT_FAILURE 2
342 #define BOND_FOM_NONE 0
343 #define BOND_FOM_ACTIVE 1
344 #define BOND_FOM_FOLLOW 2
346 #define BOND_ARP_TARGETS_ANY 0
347 #define BOND_ARP_TARGETS_ALL 1
349 #define BOND_ARP_VALIDATE_NONE 0
350 #define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
351 #define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
352 #define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
353 BOND_ARP_VALIDATE_BACKUP)
355 static inline int slave_do_arp_validate(struct bonding *bond,
358 return bond->params.arp_validate & (1 << bond_slave_state(slave));
361 /* Get the oldest arp which we've received on this slave for bond's
364 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
368 unsigned long ret = slave->target_last_arp_rx[0];
370 for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
371 if (time_before(slave->target_last_arp_rx[i], ret))
372 ret = slave->target_last_arp_rx[i];
377 static inline unsigned long slave_last_rx(struct bonding *bond,
380 if (slave_do_arp_validate(bond, slave)) {
381 if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
382 return slave_oldest_target_arp_rx(bond, slave);
384 return slave->last_arp_rx;
387 return slave->dev->last_rx;
390 #ifdef CONFIG_NET_POLL_CONTROLLER
391 static inline void bond_netpoll_send_skb(const struct slave *slave,
394 struct netpoll *np = slave->np;
397 netpoll_send_skb(np, skb);
400 static inline void bond_netpoll_send_skb(const struct slave *slave,
406 static inline void bond_set_slave_inactive_flags(struct slave *slave)
408 if (!bond_is_lb(slave->bond))
409 bond_set_backup_slave(slave);
410 if (!slave->bond->params.all_slaves_active)
414 static inline void bond_set_slave_active_flags(struct slave *slave)
416 bond_set_active_slave(slave);
420 static inline bool bond_is_slave_inactive(struct slave *slave)
422 return slave->inactive;
425 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
427 struct in_device *in_dev;
431 in_dev = __in_dev_get_rcu(dev);
434 addr = inet_confirm_addr(in_dev, dst, local, RT_SCOPE_HOST);
440 static inline bool slave_can_tx(struct slave *slave)
442 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP &&
443 bond_is_active_slave(slave))
451 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
452 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
453 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id);
454 int bond_create(struct net *net, const char *name);
455 int bond_create_sysfs(struct bond_net *net);
456 void bond_destroy_sysfs(struct bond_net *net);
457 void bond_prepare_sysfs_group(struct bonding *bond);
458 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
459 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
460 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
461 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
462 void bond_mii_monitor(struct work_struct *);
463 void bond_loadbalance_arp_mon(struct work_struct *);
464 void bond_activebackup_arp_mon(struct work_struct *);
465 void bond_set_mode_ops(struct bonding *bond, int mode);
466 int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
467 void bond_select_active_slave(struct bonding *bond);
468 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
469 void bond_create_debugfs(void);
470 void bond_destroy_debugfs(void);
471 void bond_debug_register(struct bonding *bond);
472 void bond_debug_unregister(struct bonding *bond);
473 void bond_debug_reregister(struct bonding *bond);
474 const char *bond_mode_name(int mode);
477 struct net * net; /* Associated network namespace */
478 struct list_head dev_list;
479 #ifdef CONFIG_PROC_FS
480 struct proc_dir_entry * proc_dir;
482 struct class_attribute class_attr_bonding_masters;
485 #ifdef CONFIG_PROC_FS
486 void bond_create_proc_entry(struct bonding *bond);
487 void bond_remove_proc_entry(struct bonding *bond);
488 void bond_create_proc_dir(struct bond_net *bn);
489 void bond_destroy_proc_dir(struct bond_net *bn);
491 static inline void bond_create_proc_entry(struct bonding *bond)
495 static inline void bond_remove_proc_entry(struct bonding *bond)
499 static inline void bond_create_proc_dir(struct bond_net *bn)
503 static inline void bond_destroy_proc_dir(struct bond_net *bn)
508 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
513 bond_for_each_slave(bond, tmp)
514 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
520 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
521 * Returns -1 if not found, index if found
523 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
527 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
528 if (targets[i] == ip)
530 else if (targets[i] == 0)
536 /* exported from bond_main.c */
537 extern int bond_net_id;
538 extern const struct bond_parm_tbl bond_lacp_tbl[];
539 extern const struct bond_parm_tbl bond_mode_tbl[];
540 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
541 extern const struct bond_parm_tbl arp_validate_tbl[];
542 extern const struct bond_parm_tbl arp_all_targets_tbl[];
543 extern const struct bond_parm_tbl fail_over_mac_tbl[];
544 extern const struct bond_parm_tbl pri_reselect_tbl[];
545 extern struct bond_parm_tbl ad_select_tbl[];
547 #endif /* _LINUX_BONDING_H */