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 list_head vlan_list;
190 unsigned short vlan_id;
194 struct net_device *dev; /* first - useful for panic debug */
195 struct list_head list;
196 struct bonding *bond; /* our master */
198 unsigned long jiffies;
199 unsigned long last_arp_rx;
200 unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
201 s8 link; /* one of BOND_LINK_XXXX */
203 u8 backup:1, /* indicates backup slave. Value corresponds with
204 BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
205 inactive:1; /* indicates inactive slave */
208 u32 link_failure_count;
211 u8 perm_hwaddr[ETH_ALEN];
212 struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
213 struct tlb_slave_info tlb_info;
214 #ifdef CONFIG_NET_POLL_CONTROLLER
220 * Link pseudo-state only used internally by monitors
222 #define BOND_LINK_NOCHANGE -1
225 * Here are the locking policies for the two bonding locks:
227 * 1) Get bond->lock when reading/writing slave list.
228 * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
229 * (It is unnecessary when the write-lock is put with bond->lock.)
230 * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
234 struct net_device *dev; /* first - useful for panic debug */
235 struct list_head slave_list;
236 struct slave *curr_active_slave;
237 struct slave *current_arp_slave;
238 struct slave *primary_slave;
240 s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
241 int (*recv_probe)(const struct sk_buff *, struct bonding *,
244 rwlock_t curr_slave_lock;
247 #ifdef CONFIG_PROC_FS
248 struct proc_dir_entry *proc_entry;
249 char proc_file_name[IFNAMSIZ];
250 #endif /* CONFIG_PROC_FS */
251 struct list_head bond_list;
252 int (*xmit_hash_policy)(struct sk_buff *, int);
254 struct ad_bond_info ad_info;
255 struct alb_bond_info alb_info;
256 struct bond_params params;
257 struct list_head vlan_list;
258 struct workqueue_struct *wq;
259 struct delayed_work mii_work;
260 struct delayed_work arp_work;
261 struct delayed_work alb_work;
262 struct delayed_work ad_work;
263 struct delayed_work mcast_work;
264 #ifdef CONFIG_DEBUG_FS
265 /* debugging support via debugfs */
266 struct dentry *debug_dir;
267 #endif /* CONFIG_DEBUG_FS */
270 static inline bool bond_vlan_used(struct bonding *bond)
272 return !list_empty(&bond->vlan_list);
275 #define bond_slave_get_rcu(dev) \
276 ((struct slave *) rcu_dereference(dev->rx_handler_data))
278 #define bond_slave_get_rtnl(dev) \
279 ((struct slave *) rtnl_dereference(dev->rx_handler_data))
282 * Returns NULL if the net_device does not belong to any of the bond's slaves
284 * Caller must hold bond lock for read
286 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
287 struct net_device *slave_dev)
289 struct slave *slave = NULL;
291 bond_for_each_slave(bond, slave)
292 if (slave->dev == slave_dev)
298 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
300 if (!slave || !slave->bond)
305 static inline bool bond_is_lb(const struct bonding *bond)
307 return (bond->params.mode == BOND_MODE_TLB ||
308 bond->params.mode == BOND_MODE_ALB);
311 static inline void bond_set_active_slave(struct slave *slave)
316 static inline void bond_set_backup_slave(struct slave *slave)
321 static inline int bond_slave_state(struct slave *slave)
323 return slave->backup;
326 static inline bool bond_is_active_slave(struct slave *slave)
328 return !bond_slave_state(slave);
331 #define BOND_PRI_RESELECT_ALWAYS 0
332 #define BOND_PRI_RESELECT_BETTER 1
333 #define BOND_PRI_RESELECT_FAILURE 2
335 #define BOND_FOM_NONE 0
336 #define BOND_FOM_ACTIVE 1
337 #define BOND_FOM_FOLLOW 2
339 #define BOND_ARP_TARGETS_ANY 0
340 #define BOND_ARP_TARGETS_ALL 1
342 #define BOND_ARP_VALIDATE_NONE 0
343 #define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
344 #define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
345 #define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
346 BOND_ARP_VALIDATE_BACKUP)
348 static inline int slave_do_arp_validate(struct bonding *bond,
351 return bond->params.arp_validate & (1 << bond_slave_state(slave));
354 /* Get the oldest arp which we've received on this slave for bond's
357 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
361 unsigned long ret = slave->target_last_arp_rx[0];
363 for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
364 if (time_before(slave->target_last_arp_rx[i], ret))
365 ret = slave->target_last_arp_rx[i];
370 static inline unsigned long slave_last_rx(struct bonding *bond,
373 if (slave_do_arp_validate(bond, slave)) {
374 if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
375 return slave_oldest_target_arp_rx(bond, slave);
377 return slave->last_arp_rx;
380 return slave->dev->last_rx;
383 #ifdef CONFIG_NET_POLL_CONTROLLER
384 static inline void bond_netpoll_send_skb(const struct slave *slave,
387 struct netpoll *np = slave->np;
390 netpoll_send_skb(np, skb);
393 static inline void bond_netpoll_send_skb(const struct slave *slave,
399 static inline void bond_set_slave_inactive_flags(struct slave *slave)
401 if (!bond_is_lb(slave->bond))
402 bond_set_backup_slave(slave);
403 if (!slave->bond->params.all_slaves_active)
407 static inline void bond_set_slave_active_flags(struct slave *slave)
409 bond_set_active_slave(slave);
413 static inline bool bond_is_slave_inactive(struct slave *slave)
415 return slave->inactive;
418 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
420 struct in_device *in_dev;
424 in_dev = __in_dev_get_rcu(dev);
427 addr = inet_confirm_addr(in_dev, dst, local, RT_SCOPE_HOST);
433 static inline bool slave_can_tx(struct slave *slave)
435 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP &&
436 bond_is_active_slave(slave))
444 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
445 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
446 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id);
447 int bond_create(struct net *net, const char *name);
448 int bond_create_sysfs(struct bond_net *net);
449 void bond_destroy_sysfs(struct bond_net *net);
450 void bond_prepare_sysfs_group(struct bonding *bond);
451 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
452 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
453 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
454 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
455 void bond_mii_monitor(struct work_struct *);
456 void bond_loadbalance_arp_mon(struct work_struct *);
457 void bond_activebackup_arp_mon(struct work_struct *);
458 void bond_set_mode_ops(struct bonding *bond, int mode);
459 int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
460 void bond_select_active_slave(struct bonding *bond);
461 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
462 void bond_create_debugfs(void);
463 void bond_destroy_debugfs(void);
464 void bond_debug_register(struct bonding *bond);
465 void bond_debug_unregister(struct bonding *bond);
466 void bond_debug_reregister(struct bonding *bond);
467 const char *bond_mode_name(int mode);
470 struct net * net; /* Associated network namespace */
471 struct list_head dev_list;
472 #ifdef CONFIG_PROC_FS
473 struct proc_dir_entry * proc_dir;
475 struct class_attribute class_attr_bonding_masters;
478 #ifdef CONFIG_PROC_FS
479 void bond_create_proc_entry(struct bonding *bond);
480 void bond_remove_proc_entry(struct bonding *bond);
481 void bond_create_proc_dir(struct bond_net *bn);
482 void bond_destroy_proc_dir(struct bond_net *bn);
484 static inline void bond_create_proc_entry(struct bonding *bond)
488 static inline void bond_remove_proc_entry(struct bonding *bond)
492 static inline void bond_create_proc_dir(struct bond_net *bn)
496 static inline void bond_destroy_proc_dir(struct bond_net *bn)
501 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
506 bond_for_each_slave(bond, tmp)
507 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
513 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
514 * Returns -1 if not found, index if found
516 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
520 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
521 if (targets[i] == ip)
523 else if (targets[i] == 0)
529 /* exported from bond_main.c */
530 extern int bond_net_id;
531 extern const struct bond_parm_tbl bond_lacp_tbl[];
532 extern const struct bond_parm_tbl bond_mode_tbl[];
533 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
534 extern const struct bond_parm_tbl arp_validate_tbl[];
535 extern const struct bond_parm_tbl arp_all_targets_tbl[];
536 extern const struct bond_parm_tbl fail_over_mac_tbl[];
537 extern const struct bond_parm_tbl pri_reselect_tbl[];
538 extern struct bond_parm_tbl ad_select_tbl[];
540 #endif /* _LINUX_BONDING_H */