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 "3.7.0"
28 #define DRV_RELDATE "June 2, 2010"
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 bond is ready for transmit.
43 *
44 * Caller must hold bond->lock
45 */
46 #define BOND_IS_OK(bond) \
47 (((bond)->dev->flags & IFF_UP) && \
48 netif_running((bond)->dev) && \
49 ((bond)->slave_cnt > 0))
50
51 /*
52 * Checks whether slave is ready for transmit.
53 */
54 #define SLAVE_IS_OK(slave) \
55 (((slave)->dev->flags & IFF_UP) && \
56 netif_running((slave)->dev) && \
57 ((slave)->link == BOND_LINK_UP) && \
58 bond_is_active_slave(slave))
59
60
61 #define USES_PRIMARY(mode) \
62 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
63 ((mode) == BOND_MODE_TLB) || \
64 ((mode) == BOND_MODE_ALB))
65
66 #define TX_QUEUE_OVERRIDE(mode) \
67 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
68 ((mode) == BOND_MODE_ROUNDROBIN))
69 /*
70 * Less bad way to call ioctl from within the kernel; this needs to be
71 * done some other way to get the call out of interrupt context.
72 * Needs "ioctl" variable to be supplied by calling context.
73 */
74 #define IOCTL(dev, arg, cmd) ({ \
75 int res = 0; \
76 mm_segment_t fs = get_fs(); \
77 set_fs(get_ds()); \
78 res = ioctl(dev, arg, cmd); \
79 set_fs(fs); \
80 res; })
81
82 /**
83 * bond_for_each_slave_from - iterate the slaves list from a starting point
84 * @bond: the bond holding this list.
85 * @pos: current slave.
86 * @cnt: counter for max number of moves
87 * @start: starting point.
88 *
89 * Caller must hold bond->lock
90 */
91 #define bond_for_each_slave_from(bond, pos, cnt, start) \
92 for (cnt = 0, pos = start; \
93 cnt < (bond)->slave_cnt; \
94 cnt++, pos = (pos)->next)
95
96 /**
97 * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
98 * @bond: the bond holding this list.
99 * @pos: current slave.
100 * @cnt: counter for number max of moves
101 * @start: start point.
102 * @stop: stop point.
103 *
104 * Caller must hold bond->lock
105 */
106 #define bond_for_each_slave_from_to(bond, pos, cnt, start, stop) \
107 for (cnt = 0, pos = start; \
108 ((cnt < (bond)->slave_cnt) && (pos != (stop)->next)); \
109 cnt++, pos = (pos)->next)
110
111 /**
112 * bond_for_each_slave - iterate the slaves list from head
113 * @bond: the bond holding this list.
114 * @pos: current slave.
115 * @cnt: counter for max number of moves
116 *
117 * Caller must hold bond->lock
118 */
119 #define bond_for_each_slave(bond, pos, cnt) \
120 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
121
122
123 #ifdef CONFIG_NET_POLL_CONTROLLER
124 extern atomic_t netpoll_block_tx;
125
block_netpoll_tx(void)126 static inline void block_netpoll_tx(void)
127 {
128 atomic_inc(&netpoll_block_tx);
129 }
130
unblock_netpoll_tx(void)131 static inline void unblock_netpoll_tx(void)
132 {
133 atomic_dec(&netpoll_block_tx);
134 }
135
is_netpoll_tx_blocked(struct net_device * dev)136 static inline int is_netpoll_tx_blocked(struct net_device *dev)
137 {
138 if (unlikely(netpoll_tx_running(dev)))
139 return atomic_read(&netpoll_block_tx);
140 return 0;
141 }
142 #else
143 #define block_netpoll_tx()
144 #define unblock_netpoll_tx()
145 #define is_netpoll_tx_blocked(dev) (0)
146 #endif
147
148 struct bond_params {
149 int mode;
150 int xmit_policy;
151 int miimon;
152 int num_grat_arp;
153 int num_unsol_na;
154 int arp_interval;
155 int arp_validate;
156 int use_carrier;
157 int fail_over_mac;
158 int updelay;
159 int downdelay;
160 int lacp_fast;
161 int ad_select;
162 char primary[IFNAMSIZ];
163 int primary_reselect;
164 __be32 arp_targets[BOND_MAX_ARP_TARGETS];
165 int tx_queues;
166 int all_slaves_active;
167 int resend_igmp;
168 };
169
170 struct bond_parm_tbl {
171 char *modename;
172 int mode;
173 };
174
175 #define BOND_MAX_MODENAME_LEN 20
176
177 struct vlan_entry {
178 struct list_head vlan_list;
179 __be32 vlan_ip;
180 unsigned short vlan_id;
181 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
182 struct in6_addr vlan_ipv6;
183 #endif
184 };
185
186 struct slave {
187 struct net_device *dev; /* first - useful for panic debug */
188 struct slave *next;
189 struct slave *prev;
190 struct bonding *bond; /* our master */
191 int delay;
192 unsigned long jiffies;
193 unsigned long last_arp_rx;
194 s8 link; /* one of BOND_LINK_XXXX */
195 s8 new_link;
196 u8 backup:1, /* indicates backup slave. Value corresponds with
197 BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
198 inactive:1; /* indicates inactive slave */
199 u32 original_mtu;
200 u32 link_failure_count;
201 u8 perm_hwaddr[ETH_ALEN];
202 u16 speed;
203 u8 duplex;
204 u16 queue_id;
205 struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
206 struct tlb_slave_info tlb_info;
207 #ifdef CONFIG_NET_POLL_CONTROLLER
208 struct netpoll *np;
209 #endif
210 };
211
212 /*
213 * Link pseudo-state only used internally by monitors
214 */
215 #define BOND_LINK_NOCHANGE -1
216
217 /*
218 * Here are the locking policies for the two bonding locks:
219 *
220 * 1) Get bond->lock when reading/writing slave list.
221 * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
222 * (It is unnecessary when the write-lock is put with bond->lock.)
223 * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
224 * beforehand.
225 */
226 struct bonding {
227 struct net_device *dev; /* first - useful for panic debug */
228 struct slave *first_slave;
229 struct slave *curr_active_slave;
230 struct slave *current_arp_slave;
231 struct slave *primary_slave;
232 bool force_primary;
233 s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
234 rwlock_t lock;
235 rwlock_t curr_slave_lock;
236 s8 kill_timers;
237 s8 send_grat_arp;
238 s8 send_unsol_na;
239 s8 setup_by_slave;
240 s8 igmp_retrans;
241 #ifdef CONFIG_PROC_FS
242 struct proc_dir_entry *proc_entry;
243 char proc_file_name[IFNAMSIZ];
244 #endif /* CONFIG_PROC_FS */
245 struct list_head bond_list;
246 struct netdev_hw_addr_list mc_list;
247 int (*xmit_hash_policy)(struct sk_buff *, int);
248 __be32 master_ip;
249 u16 flags;
250 u16 rr_tx_counter;
251 struct ad_bond_info ad_info;
252 struct alb_bond_info alb_info;
253 struct bond_params params;
254 struct list_head vlan_list;
255 struct vlan_group *vlgrp;
256 struct packet_type arp_mon_pt;
257 struct workqueue_struct *wq;
258 struct delayed_work mii_work;
259 struct delayed_work arp_work;
260 struct delayed_work alb_work;
261 struct delayed_work ad_work;
262 struct delayed_work mcast_work;
263 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
264 struct in6_addr master_ipv6;
265 #endif
266 #ifdef CONFIG_DEBUG_FS
267 /* debugging suport via debugfs */
268 struct dentry *debug_dir;
269 #endif /* CONFIG_DEBUG_FS */
270 };
271
272 #define bond_slave_get_rcu(dev) \
273 ((struct slave *) rcu_dereference(dev->rx_handler_data))
274
275 /**
276 * Returns NULL if the net_device does not belong to any of the bond's slaves
277 *
278 * Caller must hold bond lock for read
279 */
bond_get_slave_by_dev(struct bonding * bond,struct net_device * slave_dev)280 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
281 struct net_device *slave_dev)
282 {
283 struct slave *slave = NULL;
284 int i;
285
286 bond_for_each_slave(bond, slave, i) {
287 if (slave->dev == slave_dev) {
288 return slave;
289 }
290 }
291
292 return NULL;
293 }
294
bond_get_bond_by_slave(struct slave * slave)295 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
296 {
297 if (!slave || !slave->dev->master) {
298 return NULL;
299 }
300
301 return netdev_priv(slave->dev->master);
302 }
303
bond_is_lb(const struct bonding * bond)304 static inline bool bond_is_lb(const struct bonding *bond)
305 {
306 return (bond->params.mode == BOND_MODE_TLB ||
307 bond->params.mode == BOND_MODE_ALB);
308 }
309
bond_set_active_slave(struct slave * slave)310 static inline void bond_set_active_slave(struct slave *slave)
311 {
312 slave->backup = 0;
313 }
314
bond_set_backup_slave(struct slave * slave)315 static inline void bond_set_backup_slave(struct slave *slave)
316 {
317 slave->backup = 1;
318 }
319
bond_slave_state(struct slave * slave)320 static inline int bond_slave_state(struct slave *slave)
321 {
322 return slave->backup;
323 }
324
bond_is_active_slave(struct slave * slave)325 static inline bool bond_is_active_slave(struct slave *slave)
326 {
327 return !bond_slave_state(slave);
328 }
329
330 #define BOND_PRI_RESELECT_ALWAYS 0
331 #define BOND_PRI_RESELECT_BETTER 1
332 #define BOND_PRI_RESELECT_FAILURE 2
333
334 #define BOND_FOM_NONE 0
335 #define BOND_FOM_ACTIVE 1
336 #define BOND_FOM_FOLLOW 2
337
338 #define BOND_ARP_VALIDATE_NONE 0
339 #define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
340 #define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
341 #define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
342 BOND_ARP_VALIDATE_BACKUP)
343
slave_do_arp_validate(struct bonding * bond,struct slave * slave)344 static inline int slave_do_arp_validate(struct bonding *bond,
345 struct slave *slave)
346 {
347 return bond->params.arp_validate & (1 << bond_slave_state(slave));
348 }
349
slave_last_rx(struct bonding * bond,struct slave * slave)350 static inline unsigned long slave_last_rx(struct bonding *bond,
351 struct slave *slave)
352 {
353 if (slave_do_arp_validate(bond, slave))
354 return slave->last_arp_rx;
355
356 return slave->dev->last_rx;
357 }
358
359 #ifdef CONFIG_NET_POLL_CONTROLLER
bond_netpoll_send_skb(const struct slave * slave,struct sk_buff * skb)360 static inline void bond_netpoll_send_skb(const struct slave *slave,
361 struct sk_buff *skb)
362 {
363 struct netpoll *np = slave->np;
364
365 if (np)
366 netpoll_send_skb(np, skb);
367 }
368 #else
bond_netpoll_send_skb(const struct slave * slave,struct sk_buff * skb)369 static inline void bond_netpoll_send_skb(const struct slave *slave,
370 struct sk_buff *skb)
371 {
372 }
373 #endif
374
bond_set_slave_inactive_flags(struct slave * slave)375 static inline void bond_set_slave_inactive_flags(struct slave *slave)
376 {
377 struct bonding *bond = netdev_priv(slave->dev->master);
378 if (!bond_is_lb(bond))
379 bond_set_backup_slave(slave);
380 if (!bond->params.all_slaves_active)
381 slave->inactive = 1;
382 }
383
bond_set_slave_active_flags(struct slave * slave)384 static inline void bond_set_slave_active_flags(struct slave *slave)
385 {
386 bond_set_active_slave(slave);
387 slave->inactive = 0;
388 }
389
bond_is_slave_inactive(struct slave * slave)390 static inline bool bond_is_slave_inactive(struct slave *slave)
391 {
392 return slave->inactive;
393 }
394
395 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
396 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
397 int bond_create(struct net *net, const char *name);
398 int bond_create_sysfs(void);
399 void bond_destroy_sysfs(void);
400 void bond_prepare_sysfs_group(struct bonding *bond);
401 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
402 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
403 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
404 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
405 void bond_mii_monitor(struct work_struct *);
406 void bond_loadbalance_arp_mon(struct work_struct *);
407 void bond_activebackup_arp_mon(struct work_struct *);
408 void bond_set_mode_ops(struct bonding *bond, int mode);
409 int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
410 void bond_select_active_slave(struct bonding *bond);
411 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
412 void bond_register_arp(struct bonding *);
413 void bond_unregister_arp(struct bonding *);
414 void bond_create_debugfs(void);
415 void bond_destroy_debugfs(void);
416 void bond_debug_register(struct bonding *bond);
417 void bond_debug_unregister(struct bonding *bond);
418 void bond_debug_reregister(struct bonding *bond);
419
420 struct bond_net {
421 struct net * net; /* Associated network namespace */
422 struct list_head dev_list;
423 #ifdef CONFIG_PROC_FS
424 struct proc_dir_entry * proc_dir;
425 #endif
426 };
427
428 #ifdef CONFIG_PROC_FS
429 void bond_create_proc_entry(struct bonding *bond);
430 void bond_remove_proc_entry(struct bonding *bond);
431 void bond_create_proc_dir(struct bond_net *bn);
432 void bond_destroy_proc_dir(struct bond_net *bn);
433 #else
bond_create_proc_entry(struct bonding * bond)434 static inline void bond_create_proc_entry(struct bonding *bond)
435 {
436 }
437
bond_remove_proc_entry(struct bonding * bond)438 static inline void bond_remove_proc_entry(struct bonding *bond)
439 {
440 }
441
bond_create_proc_dir(struct bond_net * bn)442 static inline void bond_create_proc_dir(struct bond_net *bn)
443 {
444 }
445
bond_destroy_proc_dir(struct bond_net * bn)446 static inline void bond_destroy_proc_dir(struct bond_net *bn)
447 {
448 }
449 #endif
450
451
452 /* exported from bond_main.c */
453 extern int bond_net_id;
454 extern const struct bond_parm_tbl bond_lacp_tbl[];
455 extern const struct bond_parm_tbl bond_mode_tbl[];
456 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
457 extern const struct bond_parm_tbl arp_validate_tbl[];
458 extern const struct bond_parm_tbl fail_over_mac_tbl[];
459 extern const struct bond_parm_tbl pri_reselect_tbl[];
460 extern struct bond_parm_tbl ad_select_tbl[];
461
462 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
463 void bond_send_unsolicited_na(struct bonding *bond);
464 void bond_register_ipv6_notifier(void);
465 void bond_unregister_ipv6_notifier(void);
466 #else
bond_send_unsolicited_na(struct bonding * bond)467 static inline void bond_send_unsolicited_na(struct bonding *bond)
468 {
469 return;
470 }
bond_register_ipv6_notifier(void)471 static inline void bond_register_ipv6_notifier(void)
472 {
473 return;
474 }
bond_unregister_ipv6_notifier(void)475 static inline void bond_unregister_ipv6_notifier(void)
476 {
477 return;
478 }
479 #endif
480
481 #endif /* _LINUX_BONDING_H */
482