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_ARP_TARGETS 16
41 #define BOND_DEFAULT_MIIMON 100
44 ((((dev)->flags & IFF_UP) == IFF_UP) && \
45 netif_running(dev) && \
46 netif_carrier_ok(dev))
49 * Checks whether slave is ready for transmit.
51 #define SLAVE_IS_OK(slave) \
52 (((slave)->dev->flags & IFF_UP) && \
53 netif_running((slave)->dev) && \
54 ((slave)->link == BOND_LINK_UP) && \
55 bond_is_active_slave(slave))
58 #define USES_PRIMARY(mode) \
59 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
60 ((mode) == BOND_MODE_TLB) || \
61 ((mode) == BOND_MODE_ALB))
63 #define BOND_NO_USES_ARP(mode) \
64 (((mode) == BOND_MODE_8023AD) || \
65 ((mode) == BOND_MODE_TLB) || \
66 ((mode) == BOND_MODE_ALB))
68 #define TX_QUEUE_OVERRIDE(mode) \
69 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
70 ((mode) == BOND_MODE_ROUNDROBIN))
72 #define BOND_MODE_IS_LB(mode) \
73 (((mode) == BOND_MODE_TLB) || \
74 ((mode) == BOND_MODE_ALB))
76 #define IS_IP_TARGET_UNUSABLE_ADDRESS(a) \
77 ((htonl(INADDR_BROADCAST) == a) || \
80 * Less bad way to call ioctl from within the kernel; this needs to be
81 * done some other way to get the call out of interrupt context.
82 * Needs "ioctl" variable to be supplied by calling context.
84 #define IOCTL(dev, arg, cmd) ({ \
86 mm_segment_t fs = get_fs(); \
88 res = ioctl(dev, arg, cmd); \
92 /* slave list primitives */
93 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
95 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
97 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
98 #define bond_first_slave(bond) \
99 (bond_has_slaves(bond) ? \
100 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
102 #define bond_last_slave(bond) \
103 (bond_has_slaves(bond) ? \
104 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
107 /* Caller must have rcu_read_lock */
108 #define bond_first_slave_rcu(bond) \
109 netdev_lower_get_first_private_rcu(bond->dev)
111 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
112 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
115 * bond_for_each_slave - iterate over all slaves
116 * @bond: the bond holding this list
117 * @pos: current slave
118 * @iter: list_head * iterator
120 * Caller must hold bond->lock
122 #define bond_for_each_slave(bond, pos, iter) \
123 netdev_for_each_lower_private((bond)->dev, pos, iter)
125 /* Caller must have rcu_read_lock */
126 #define bond_for_each_slave_rcu(bond, pos, iter) \
127 netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
129 #ifdef CONFIG_NET_POLL_CONTROLLER
130 extern atomic_t netpoll_block_tx;
132 static inline void block_netpoll_tx(void)
134 atomic_inc(&netpoll_block_tx);
137 static inline void unblock_netpoll_tx(void)
139 atomic_dec(&netpoll_block_tx);
142 static inline int is_netpoll_tx_blocked(struct net_device *dev)
144 if (unlikely(netpoll_tx_running(dev)))
145 return atomic_read(&netpoll_block_tx);
149 #define block_netpoll_tx()
150 #define unblock_netpoll_tx()
151 #define is_netpoll_tx_blocked(dev) (0)
167 unsigned int min_links;
169 char primary[IFNAMSIZ];
170 int primary_reselect;
171 __be32 arp_targets[BOND_MAX_ARP_TARGETS];
173 int all_slaves_active;
176 int packets_per_slave;
178 struct reciprocal_value reciprocal_packets_per_slave;
181 struct bond_parm_tbl {
186 #define BOND_MAX_MODENAME_LEN 20
189 struct net_device *dev; /* first - useful for panic debug */
190 struct bonding *bond; /* our master */
192 /* all three in jiffies */
193 unsigned long last_link_up;
194 unsigned long last_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 */
201 should_notify:1; /* indicateds whether the state changed */
204 u32 link_failure_count;
207 u8 perm_hwaddr[ETH_ALEN];
208 struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
209 struct tlb_slave_info tlb_info;
210 #ifdef CONFIG_NET_POLL_CONTROLLER
217 * Link pseudo-state only used internally by monitors
219 #define BOND_LINK_NOCHANGE -1
222 * Here are the locking policies for the two bonding locks:
224 * 1) Get bond->lock when reading/writing slave list.
225 * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
226 * (It is unnecessary when the write-lock is put with bond->lock.)
227 * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
231 struct net_device *dev; /* first - useful for panic debug */
232 struct slave *curr_active_slave;
233 struct slave *current_arp_slave;
234 struct slave *primary_slave;
236 s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
237 int (*recv_probe)(const struct sk_buff *, struct bonding *,
240 rwlock_t curr_slave_lock;
243 #ifdef CONFIG_PROC_FS
244 struct proc_dir_entry *proc_entry;
245 char proc_file_name[IFNAMSIZ];
246 #endif /* CONFIG_PROC_FS */
247 struct list_head bond_list;
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 #define bond_slave_get_rcu(dev) \
265 ((struct slave *) rcu_dereference(dev->rx_handler_data))
267 #define bond_slave_get_rtnl(dev) \
268 ((struct slave *) rtnl_dereference(dev->rx_handler_data))
270 struct bond_vlan_tag {
272 unsigned short vlan_id;
276 * Returns NULL if the net_device does not belong to any of the bond's slaves
278 * Caller must hold bond lock for read
280 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
281 struct net_device *slave_dev)
283 return netdev_lower_dev_get_private(bond->dev, slave_dev);
286 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
288 if (!slave || !slave->bond)
293 static inline bool bond_is_lb(const struct bonding *bond)
295 return BOND_MODE_IS_LB(bond->params.mode);
298 static inline void bond_set_active_slave(struct slave *slave)
302 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
306 static inline void bond_set_backup_slave(struct slave *slave)
308 if (!slave->backup) {
310 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
314 static inline void bond_set_slave_state(struct slave *slave,
315 int slave_state, bool notify)
317 if (slave->backup == slave_state)
320 slave->backup = slave_state;
322 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
323 slave->should_notify = 0;
325 if (slave->should_notify)
326 slave->should_notify = 0;
328 slave->should_notify = 1;
332 static inline void bond_slave_state_change(struct bonding *bond)
334 struct list_head *iter;
337 bond_for_each_slave(bond, tmp, iter) {
338 if (tmp->link == BOND_LINK_UP)
339 bond_set_active_slave(tmp);
340 else if (tmp->link == BOND_LINK_DOWN)
341 bond_set_backup_slave(tmp);
345 static inline void bond_slave_state_notify(struct bonding *bond)
347 struct list_head *iter;
350 bond_for_each_slave(bond, tmp, iter) {
351 if (tmp->should_notify) {
352 rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
353 tmp->should_notify = 0;
358 static inline int bond_slave_state(struct slave *slave)
360 return slave->backup;
363 static inline bool bond_is_active_slave(struct slave *slave)
365 return !bond_slave_state(slave);
368 #define BOND_PRI_RESELECT_ALWAYS 0
369 #define BOND_PRI_RESELECT_BETTER 1
370 #define BOND_PRI_RESELECT_FAILURE 2
372 #define BOND_FOM_NONE 0
373 #define BOND_FOM_ACTIVE 1
374 #define BOND_FOM_FOLLOW 2
376 #define BOND_ARP_TARGETS_ANY 0
377 #define BOND_ARP_TARGETS_ALL 1
379 #define BOND_ARP_VALIDATE_NONE 0
380 #define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
381 #define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
382 #define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
383 BOND_ARP_VALIDATE_BACKUP)
384 #define BOND_ARP_FILTER (BOND_ARP_VALIDATE_ALL + 1)
385 #define BOND_ARP_FILTER_ACTIVE (BOND_ARP_VALIDATE_ACTIVE | \
387 #define BOND_ARP_FILTER_BACKUP (BOND_ARP_VALIDATE_BACKUP | \
390 #define BOND_SLAVE_NOTIFY_NOW true
391 #define BOND_SLAVE_NOTIFY_LATER false
393 static inline int slave_do_arp_validate(struct bonding *bond,
396 return bond->params.arp_validate & (1 << bond_slave_state(slave));
399 static inline int slave_do_arp_validate_only(struct bonding *bond)
401 return bond->params.arp_validate & BOND_ARP_FILTER;
404 /* Get the oldest arp which we've received on this slave for bond's
407 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
411 unsigned long ret = slave->target_last_arp_rx[0];
413 for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
414 if (time_before(slave->target_last_arp_rx[i], ret))
415 ret = slave->target_last_arp_rx[i];
420 static inline unsigned long slave_last_rx(struct bonding *bond,
423 if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
424 return slave_oldest_target_arp_rx(bond, slave);
426 return slave->last_rx;
429 #ifdef CONFIG_NET_POLL_CONTROLLER
430 static inline void bond_netpoll_send_skb(const struct slave *slave,
433 struct netpoll *np = slave->np;
436 netpoll_send_skb(np, skb);
439 static inline void bond_netpoll_send_skb(const struct slave *slave,
445 static inline void bond_set_slave_inactive_flags(struct slave *slave,
448 if (!bond_is_lb(slave->bond))
449 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
450 if (!slave->bond->params.all_slaves_active)
454 static inline void bond_set_slave_active_flags(struct slave *slave,
457 bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
461 static inline bool bond_is_slave_inactive(struct slave *slave)
463 return slave->inactive;
466 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
468 struct in_device *in_dev;
472 in_dev = __in_dev_get_rcu(dev);
475 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
481 static inline bool slave_can_tx(struct slave *slave)
483 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP &&
484 bond_is_active_slave(slave))
491 struct net *net; /* Associated network namespace */
492 struct list_head dev_list;
493 #ifdef CONFIG_PROC_FS
494 struct proc_dir_entry *proc_dir;
496 struct class_attribute class_attr_bonding_masters;
499 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
500 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
501 int bond_create(struct net *net, const char *name);
502 int bond_create_sysfs(struct bond_net *net);
503 void bond_destroy_sysfs(struct bond_net *net);
504 void bond_prepare_sysfs_group(struct bonding *bond);
505 int bond_sysfs_slave_add(struct slave *slave);
506 void bond_sysfs_slave_del(struct slave *slave);
507 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
508 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
509 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
510 void bond_select_active_slave(struct bonding *bond);
511 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
512 void bond_create_debugfs(void);
513 void bond_destroy_debugfs(void);
514 void bond_debug_register(struct bonding *bond);
515 void bond_debug_unregister(struct bonding *bond);
516 void bond_debug_reregister(struct bonding *bond);
517 const char *bond_mode_name(int mode);
518 void bond_setup(struct net_device *bond_dev);
519 unsigned int bond_get_num_tx_queues(void);
520 int bond_netlink_init(void);
521 void bond_netlink_fini(void);
522 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
523 struct net_device *bond_option_active_slave_get(struct bonding *bond);
524 const char *bond_slave_link_status(s8 link);
526 #ifdef CONFIG_PROC_FS
527 void bond_create_proc_entry(struct bonding *bond);
528 void bond_remove_proc_entry(struct bonding *bond);
529 void bond_create_proc_dir(struct bond_net *bn);
530 void bond_destroy_proc_dir(struct bond_net *bn);
532 static inline void bond_create_proc_entry(struct bonding *bond)
536 static inline void bond_remove_proc_entry(struct bonding *bond)
540 static inline void bond_create_proc_dir(struct bond_net *bn)
544 static inline void bond_destroy_proc_dir(struct bond_net *bn)
549 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
552 struct list_head *iter;
555 bond_for_each_slave(bond, tmp, iter)
556 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
562 /* Caller must hold rcu_read_lock() for read */
563 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
566 struct list_head *iter;
569 bond_for_each_slave_rcu(bond, tmp, iter)
570 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
576 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
577 * Returns -1 if not found, index if found
579 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
583 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
584 if (targets[i] == ip)
586 else if (targets[i] == 0)
592 /* exported from bond_main.c */
593 extern int bond_net_id;
594 extern const struct bond_parm_tbl bond_lacp_tbl[];
595 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
596 extern const struct bond_parm_tbl arp_validate_tbl[];
597 extern const struct bond_parm_tbl arp_all_targets_tbl[];
598 extern const struct bond_parm_tbl fail_over_mac_tbl[];
599 extern const struct bond_parm_tbl pri_reselect_tbl[];
600 extern struct bond_parm_tbl ad_select_tbl[];
602 /* exported from bond_netlink.c */
603 extern struct rtnl_link_ops bond_link_ops;
605 #endif /* _LINUX_BONDING_H */