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>
26 #include <linux/reciprocal_div.h>
30 #include "bond_options.h"
32 #define DRV_VERSION "3.7.1"
33 #define DRV_RELDATE "April 27, 2011"
34 #define DRV_NAME "bonding"
35 #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
37 #define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
39 #define BOND_MAX_VLAN_ENCAP 2
40 #define BOND_MAX_ARP_TARGETS 16
42 #define BOND_DEFAULT_MIIMON 100
45 * Less bad way to call ioctl from within the kernel; this needs to be
46 * done some other way to get the call out of interrupt context.
47 * Needs "ioctl" variable to be supplied by calling context.
49 #define IOCTL(dev, arg, cmd) ({ \
51 mm_segment_t fs = get_fs(); \
53 res = ioctl(dev, arg, cmd); \
57 #define BOND_MODE(bond) ((bond)->params.mode)
59 /* slave list primitives */
60 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
62 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
64 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
65 #define bond_first_slave(bond) \
66 (bond_has_slaves(bond) ? \
67 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
69 #define bond_last_slave(bond) \
70 (bond_has_slaves(bond) ? \
71 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
74 /* Caller must have rcu_read_lock */
75 #define bond_first_slave_rcu(bond) \
76 netdev_lower_get_first_private_rcu(bond->dev)
78 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
79 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
82 * bond_for_each_slave - iterate over all slaves
83 * @bond: the bond holding this list
85 * @iter: list_head * iterator
87 * Caller must hold bond->lock
89 #define bond_for_each_slave(bond, pos, iter) \
90 netdev_for_each_lower_private((bond)->dev, pos, iter)
92 /* Caller must have rcu_read_lock */
93 #define bond_for_each_slave_rcu(bond, pos, iter) \
94 netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
96 #ifdef CONFIG_NET_POLL_CONTROLLER
97 extern atomic_t netpoll_block_tx;
99 static inline void block_netpoll_tx(void)
101 atomic_inc(&netpoll_block_tx);
104 static inline void unblock_netpoll_tx(void)
106 atomic_dec(&netpoll_block_tx);
109 static inline int is_netpoll_tx_blocked(struct net_device *dev)
111 if (unlikely(netpoll_tx_running(dev)))
112 return atomic_read(&netpoll_block_tx);
116 #define block_netpoll_tx()
117 #define unblock_netpoll_tx()
118 #define is_netpoll_tx_blocked(dev) (0)
134 unsigned int min_links;
136 char primary[IFNAMSIZ];
137 int primary_reselect;
138 __be32 arp_targets[BOND_MAX_ARP_TARGETS];
140 int all_slaves_active;
143 int packets_per_slave;
145 struct reciprocal_value reciprocal_packets_per_slave;
148 struct bond_parm_tbl {
154 struct net_device *dev; /* first - useful for panic debug */
155 struct bonding *bond; /* our master */
157 /* all three in jiffies */
158 unsigned long last_link_up;
159 unsigned long last_rx;
160 unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
161 s8 link; /* one of BOND_LINK_XXXX */
163 u8 backup:1, /* indicates backup slave. Value corresponds with
164 BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
165 inactive:1, /* indicates inactive slave */
166 should_notify:1; /* indicateds whether the state changed */
169 u32 link_failure_count;
172 u8 perm_hwaddr[ETH_ALEN];
173 struct ad_slave_info *ad_info;
174 struct tlb_slave_info tlb_info;
175 #ifdef CONFIG_NET_POLL_CONTROLLER
182 * Link pseudo-state only used internally by monitors
184 #define BOND_LINK_NOCHANGE -1
187 * Here are the locking policies for the two bonding locks:
189 * 1) Get bond->lock when reading/writing slave list.
190 * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
191 * (It is unnecessary when the write-lock is put with bond->lock.)
192 * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
196 struct net_device *dev; /* first - useful for panic debug */
197 struct slave *curr_active_slave;
198 struct slave *current_arp_slave;
199 struct slave *primary_slave;
201 s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
202 int (*recv_probe)(const struct sk_buff *, struct bonding *,
205 rwlock_t curr_slave_lock;
208 #ifdef CONFIG_PROC_FS
209 struct proc_dir_entry *proc_entry;
210 char proc_file_name[IFNAMSIZ];
211 #endif /* CONFIG_PROC_FS */
212 struct list_head bond_list;
214 struct ad_bond_info ad_info;
215 struct alb_bond_info alb_info;
216 struct bond_params params;
217 struct workqueue_struct *wq;
218 struct delayed_work mii_work;
219 struct delayed_work arp_work;
220 struct delayed_work alb_work;
221 struct delayed_work ad_work;
222 struct delayed_work mcast_work;
223 #ifdef CONFIG_DEBUG_FS
224 /* debugging support via debugfs */
225 struct dentry *debug_dir;
226 #endif /* CONFIG_DEBUG_FS */
229 #define bond_slave_get_rcu(dev) \
230 ((struct slave *) rcu_dereference(dev->rx_handler_data))
232 #define bond_slave_get_rtnl(dev) \
233 ((struct slave *) rtnl_dereference(dev->rx_handler_data))
235 struct bond_vlan_tag {
237 unsigned short vlan_id;
241 * Returns NULL if the net_device does not belong to any of the bond's slaves
243 * Caller must hold bond lock for read
245 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
246 struct net_device *slave_dev)
248 return netdev_lower_dev_get_private(bond->dev, slave_dev);
251 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
256 static inline bool bond_should_override_tx_queue(struct bonding *bond)
258 return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
259 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
262 static inline bool bond_is_lb(const struct bonding *bond)
264 return BOND_MODE(bond) == BOND_MODE_TLB ||
265 BOND_MODE(bond) == BOND_MODE_ALB;
268 static inline bool bond_mode_uses_arp(int mode)
270 return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
271 mode != BOND_MODE_ALB;
274 static inline bool bond_mode_uses_primary(int mode)
276 return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
277 mode == BOND_MODE_ALB;
280 static inline bool bond_uses_primary(struct bonding *bond)
282 return bond_mode_uses_primary(BOND_MODE(bond));
285 static inline bool bond_slave_is_up(struct slave *slave)
287 return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
290 static inline void bond_set_active_slave(struct slave *slave)
294 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
298 static inline void bond_set_backup_slave(struct slave *slave)
300 if (!slave->backup) {
302 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
306 static inline void bond_set_slave_state(struct slave *slave,
307 int slave_state, bool notify)
309 if (slave->backup == slave_state)
312 slave->backup = slave_state;
314 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
315 slave->should_notify = 0;
317 if (slave->should_notify)
318 slave->should_notify = 0;
320 slave->should_notify = 1;
324 static inline void bond_slave_state_change(struct bonding *bond)
326 struct list_head *iter;
329 bond_for_each_slave(bond, tmp, iter) {
330 if (tmp->link == BOND_LINK_UP)
331 bond_set_active_slave(tmp);
332 else if (tmp->link == BOND_LINK_DOWN)
333 bond_set_backup_slave(tmp);
337 static inline void bond_slave_state_notify(struct bonding *bond)
339 struct list_head *iter;
342 bond_for_each_slave(bond, tmp, iter) {
343 if (tmp->should_notify) {
344 rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
345 tmp->should_notify = 0;
350 static inline int bond_slave_state(struct slave *slave)
352 return slave->backup;
355 static inline bool bond_is_active_slave(struct slave *slave)
357 return !bond_slave_state(slave);
360 static inline bool bond_slave_can_tx(struct slave *slave)
362 return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
363 bond_is_active_slave(slave);
366 #define BOND_PRI_RESELECT_ALWAYS 0
367 #define BOND_PRI_RESELECT_BETTER 1
368 #define BOND_PRI_RESELECT_FAILURE 2
370 #define BOND_FOM_NONE 0
371 #define BOND_FOM_ACTIVE 1
372 #define BOND_FOM_FOLLOW 2
374 #define BOND_ARP_TARGETS_ANY 0
375 #define BOND_ARP_TARGETS_ALL 1
377 #define BOND_ARP_VALIDATE_NONE 0
378 #define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
379 #define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
380 #define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
381 BOND_ARP_VALIDATE_BACKUP)
382 #define BOND_ARP_FILTER (BOND_ARP_VALIDATE_ALL + 1)
383 #define BOND_ARP_FILTER_ACTIVE (BOND_ARP_VALIDATE_ACTIVE | \
385 #define BOND_ARP_FILTER_BACKUP (BOND_ARP_VALIDATE_BACKUP | \
388 #define BOND_SLAVE_NOTIFY_NOW true
389 #define BOND_SLAVE_NOTIFY_LATER false
391 static inline int slave_do_arp_validate(struct bonding *bond,
394 return bond->params.arp_validate & (1 << bond_slave_state(slave));
397 static inline int slave_do_arp_validate_only(struct bonding *bond)
399 return bond->params.arp_validate & BOND_ARP_FILTER;
402 static inline int bond_is_ip_target_ok(__be32 addr)
404 return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
407 /* Get the oldest arp which we've received on this slave for bond's
410 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
414 unsigned long ret = slave->target_last_arp_rx[0];
416 for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
417 if (time_before(slave->target_last_arp_rx[i], ret))
418 ret = slave->target_last_arp_rx[i];
423 static inline unsigned long slave_last_rx(struct bonding *bond,
426 if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
427 return slave_oldest_target_arp_rx(bond, slave);
429 return slave->last_rx;
432 #ifdef CONFIG_NET_POLL_CONTROLLER
433 static inline void bond_netpoll_send_skb(const struct slave *slave,
436 struct netpoll *np = slave->np;
439 netpoll_send_skb(np, skb);
442 static inline void bond_netpoll_send_skb(const struct slave *slave,
448 static inline void bond_set_slave_inactive_flags(struct slave *slave,
451 if (!bond_is_lb(slave->bond))
452 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
453 if (!slave->bond->params.all_slaves_active)
457 static inline void bond_set_slave_active_flags(struct slave *slave,
460 bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
464 static inline bool bond_is_slave_inactive(struct slave *slave)
466 return slave->inactive;
469 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
471 struct in_device *in_dev;
475 in_dev = __in_dev_get_rcu(dev);
478 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
485 struct net *net; /* Associated network namespace */
486 struct list_head dev_list;
487 #ifdef CONFIG_PROC_FS
488 struct proc_dir_entry *proc_dir;
490 struct class_attribute class_attr_bonding_masters;
493 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
494 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
495 int bond_create(struct net *net, const char *name);
496 int bond_create_sysfs(struct bond_net *net);
497 void bond_destroy_sysfs(struct bond_net *net);
498 void bond_prepare_sysfs_group(struct bonding *bond);
499 int bond_sysfs_slave_add(struct slave *slave);
500 void bond_sysfs_slave_del(struct slave *slave);
501 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
502 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
503 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
504 void bond_select_active_slave(struct bonding *bond);
505 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
506 void bond_create_debugfs(void);
507 void bond_destroy_debugfs(void);
508 void bond_debug_register(struct bonding *bond);
509 void bond_debug_unregister(struct bonding *bond);
510 void bond_debug_reregister(struct bonding *bond);
511 const char *bond_mode_name(int mode);
512 void bond_setup(struct net_device *bond_dev);
513 unsigned int bond_get_num_tx_queues(void);
514 int bond_netlink_init(void);
515 void bond_netlink_fini(void);
516 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
517 struct net_device *bond_option_active_slave_get(struct bonding *bond);
518 const char *bond_slave_link_status(s8 link);
519 bool bond_verify_device_path(struct net_device *start_dev,
520 struct net_device *end_dev,
521 struct bond_vlan_tag *tags);
523 #ifdef CONFIG_PROC_FS
524 void bond_create_proc_entry(struct bonding *bond);
525 void bond_remove_proc_entry(struct bonding *bond);
526 void bond_create_proc_dir(struct bond_net *bn);
527 void bond_destroy_proc_dir(struct bond_net *bn);
529 static inline void bond_create_proc_entry(struct bonding *bond)
533 static inline void bond_remove_proc_entry(struct bonding *bond)
537 static inline void bond_create_proc_dir(struct bond_net *bn)
541 static inline void bond_destroy_proc_dir(struct bond_net *bn)
546 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
549 struct list_head *iter;
552 bond_for_each_slave(bond, tmp, iter)
553 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
559 /* Caller must hold rcu_read_lock() for read */
560 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
563 struct list_head *iter;
566 bond_for_each_slave_rcu(bond, tmp, iter)
567 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
573 /* Caller must hold rcu_read_lock() for read */
574 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
576 struct list_head *iter;
578 struct netdev_hw_addr *ha;
580 bond_for_each_slave_rcu(bond, tmp, iter)
581 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
584 if (netdev_uc_empty(bond->dev))
587 netdev_for_each_uc_addr(ha, bond->dev)
588 if (ether_addr_equal_64bits(mac, ha->addr))
594 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
595 * Returns -1 if not found, index if found
597 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
601 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
602 if (targets[i] == ip)
604 else if (targets[i] == 0)
610 /* exported from bond_main.c */
611 extern int bond_net_id;
612 extern const struct bond_parm_tbl bond_lacp_tbl[];
613 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
614 extern const struct bond_parm_tbl arp_validate_tbl[];
615 extern const struct bond_parm_tbl arp_all_targets_tbl[];
616 extern const struct bond_parm_tbl fail_over_mac_tbl[];
617 extern const struct bond_parm_tbl pri_reselect_tbl[];
618 extern struct bond_parm_tbl ad_select_tbl[];
620 /* exported from bond_netlink.c */
621 extern struct rtnl_link_ops bond_link_ops;
623 #endif /* _LINUX_BONDING_H */