tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 <linux/inetdevice.h>
25#include <linux/etherdevice.h>
26#include "bond_3ad.h"
27#include "bond_alb.h"
28
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"
33
34#define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
35
36#define BOND_MAX_ARP_TARGETS 16
37
38#define IS_UP(dev) \
39 ((((dev)->flags & IFF_UP) == IFF_UP) && \
40 netif_running(dev) && \
41 netif_carrier_ok(dev))
42
43/*
44 * Checks whether slave is ready for transmit.
45 */
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))
51
52
53#define USES_PRIMARY(mode) \
54 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
55 ((mode) == BOND_MODE_TLB) || \
56 ((mode) == BOND_MODE_ALB))
57
58#define TX_QUEUE_OVERRIDE(mode) \
59 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
60 ((mode) == BOND_MODE_ROUNDROBIN))
61/*
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.
65 */
66#define IOCTL(dev, arg, cmd) ({ \
67 int res = 0; \
68 mm_segment_t fs = get_fs(); \
69 set_fs(get_ds()); \
70 res = ioctl(dev, arg, cmd); \
71 set_fs(fs); \
72 res; })
73
74/**
75 * bond_for_each_slave_from - iterate the slaves list from a starting point
76 * @bond: the bond holding this list.
77 * @pos: current slave.
78 * @cnt: counter for max number of moves
79 * @start: starting point.
80 *
81 * Caller must hold bond->lock
82 */
83#define bond_for_each_slave_from(bond, pos, cnt, start) \
84 for (cnt = 0, pos = start; \
85 cnt < (bond)->slave_cnt; \
86 cnt++, pos = (pos)->next)
87
88/**
89 * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
90 * @bond: the bond holding this list.
91 * @pos: current slave.
92 * @cnt: counter for number max of moves
93 * @start: start point.
94 * @stop: stop point.
95 *
96 * Caller must hold bond->lock
97 */
98#define bond_for_each_slave_from_to(bond, pos, cnt, start, stop) \
99 for (cnt = 0, pos = start; \
100 ((cnt < (bond)->slave_cnt) && (pos != (stop)->next)); \
101 cnt++, pos = (pos)->next)
102
103/**
104 * bond_for_each_slave - iterate the slaves list from head
105 * @bond: the bond holding this list.
106 * @pos: current slave.
107 * @cnt: counter for max number of moves
108 *
109 * Caller must hold bond->lock
110 */
111#define bond_for_each_slave(bond, pos, cnt) \
112 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
113
114
115#ifdef CONFIG_NET_POLL_CONTROLLER
116extern atomic_t netpoll_block_tx;
117
118static inline void block_netpoll_tx(void)
119{
120 atomic_inc(&netpoll_block_tx);
121}
122
123static inline void unblock_netpoll_tx(void)
124{
125 atomic_dec(&netpoll_block_tx);
126}
127
128static inline int is_netpoll_tx_blocked(struct net_device *dev)
129{
130 if (unlikely(netpoll_tx_running(dev)))
131 return atomic_read(&netpoll_block_tx);
132 return 0;
133}
134#else
135#define block_netpoll_tx()
136#define unblock_netpoll_tx()
137#define is_netpoll_tx_blocked(dev) (0)
138#endif
139
140struct bond_params {
141 int mode;
142 int xmit_policy;
143 int miimon;
144 u8 num_peer_notif;
145 int arp_interval;
146 int arp_validate;
147 int use_carrier;
148 int fail_over_mac;
149 int updelay;
150 int downdelay;
151 int lacp_fast;
152 unsigned int min_links;
153 int ad_select;
154 char primary[IFNAMSIZ];
155 int primary_reselect;
156 __be32 arp_targets[BOND_MAX_ARP_TARGETS];
157 int tx_queues;
158 int all_slaves_active;
159 int resend_igmp;
160};
161
162struct bond_parm_tbl {
163 char *modename;
164 int mode;
165};
166
167#define BOND_MAX_MODENAME_LEN 20
168
169struct vlan_entry {
170 struct list_head vlan_list;
171 unsigned short vlan_id;
172};
173
174struct slave {
175 struct net_device *dev; /* first - useful for panic debug */
176 struct slave *next;
177 struct slave *prev;
178 struct bonding *bond; /* our master */
179 int delay;
180 unsigned long jiffies;
181 unsigned long last_arp_rx;
182 s8 link; /* one of BOND_LINK_XXXX */
183 s8 new_link;
184 u8 backup:1, /* indicates backup slave. Value corresponds with
185 BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
186 inactive:1; /* indicates inactive slave */
187 u8 duplex;
188 u32 original_mtu;
189 u32 link_failure_count;
190 u32 speed;
191 u16 queue_id;
192 u8 perm_hwaddr[ETH_ALEN];
193 struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
194 struct tlb_slave_info tlb_info;
195#ifdef CONFIG_NET_POLL_CONTROLLER
196 struct netpoll *np;
197#endif
198};
199
200/*
201 * Link pseudo-state only used internally by monitors
202 */
203#define BOND_LINK_NOCHANGE -1
204
205/*
206 * Here are the locking policies for the two bonding locks:
207 *
208 * 1) Get bond->lock when reading/writing slave list.
209 * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
210 * (It is unnecessary when the write-lock is put with bond->lock.)
211 * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
212 * beforehand.
213 */
214struct bonding {
215 struct net_device *dev; /* first - useful for panic debug */
216 struct slave *first_slave;
217 struct slave *curr_active_slave;
218 struct slave *current_arp_slave;
219 struct slave *primary_slave;
220 bool force_primary;
221 s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
222 int (*recv_probe)(const struct sk_buff *, struct bonding *,
223 struct slave *);
224 rwlock_t lock;
225 rwlock_t curr_slave_lock;
226 u8 send_peer_notif;
227 s8 setup_by_slave;
228 s8 igmp_retrans;
229#ifdef CONFIG_PROC_FS
230 struct proc_dir_entry *proc_entry;
231 char proc_file_name[IFNAMSIZ];
232#endif /* CONFIG_PROC_FS */
233 struct list_head bond_list;
234 struct netdev_hw_addr_list mc_list;
235 int (*xmit_hash_policy)(struct sk_buff *, int);
236 u16 rr_tx_counter;
237 struct ad_bond_info ad_info;
238 struct alb_bond_info alb_info;
239 struct bond_params params;
240 struct list_head vlan_list;
241 struct workqueue_struct *wq;
242 struct delayed_work mii_work;
243 struct delayed_work arp_work;
244 struct delayed_work alb_work;
245 struct delayed_work ad_work;
246 struct delayed_work mcast_work;
247#ifdef CONFIG_DEBUG_FS
248 /* debugging support via debugfs */
249 struct dentry *debug_dir;
250#endif /* CONFIG_DEBUG_FS */
251 bool dev_addr_from_first;
252};
253
254static inline bool bond_vlan_used(struct bonding *bond)
255{
256 return !list_empty(&bond->vlan_list);
257}
258
259#define bond_slave_get_rcu(dev) \
260 ((struct slave *) rcu_dereference(dev->rx_handler_data))
261
262#define bond_slave_get_rtnl(dev) \
263 ((struct slave *) rtnl_dereference(dev->rx_handler_data))
264
265/**
266 * Returns NULL if the net_device does not belong to any of the bond's slaves
267 *
268 * Caller must hold bond lock for read
269 */
270static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
271 struct net_device *slave_dev)
272{
273 struct slave *slave = NULL;
274 int i;
275
276 bond_for_each_slave(bond, slave, i) {
277 if (slave->dev == slave_dev) {
278 return slave;
279 }
280 }
281
282 return NULL;
283}
284
285static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
286{
287 if (!slave || !slave->bond)
288 return NULL;
289 return slave->bond;
290}
291
292static inline bool bond_is_lb(const struct bonding *bond)
293{
294 return (bond->params.mode == BOND_MODE_TLB ||
295 bond->params.mode == BOND_MODE_ALB);
296}
297
298static inline void bond_set_active_slave(struct slave *slave)
299{
300 slave->backup = 0;
301}
302
303static inline void bond_set_backup_slave(struct slave *slave)
304{
305 slave->backup = 1;
306}
307
308static inline int bond_slave_state(struct slave *slave)
309{
310 return slave->backup;
311}
312
313static inline bool bond_is_active_slave(struct slave *slave)
314{
315 return !bond_slave_state(slave);
316}
317
318#define BOND_PRI_RESELECT_ALWAYS 0
319#define BOND_PRI_RESELECT_BETTER 1
320#define BOND_PRI_RESELECT_FAILURE 2
321
322#define BOND_FOM_NONE 0
323#define BOND_FOM_ACTIVE 1
324#define BOND_FOM_FOLLOW 2
325
326#define BOND_ARP_VALIDATE_NONE 0
327#define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
328#define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
329#define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
330 BOND_ARP_VALIDATE_BACKUP)
331
332static inline int slave_do_arp_validate(struct bonding *bond,
333 struct slave *slave)
334{
335 return bond->params.arp_validate & (1 << bond_slave_state(slave));
336}
337
338static inline unsigned long slave_last_rx(struct bonding *bond,
339 struct slave *slave)
340{
341 if (slave_do_arp_validate(bond, slave))
342 return slave->last_arp_rx;
343
344 return slave->dev->last_rx;
345}
346
347#ifdef CONFIG_NET_POLL_CONTROLLER
348static inline void bond_netpoll_send_skb(const struct slave *slave,
349 struct sk_buff *skb)
350{
351 struct netpoll *np = slave->np;
352
353 if (np)
354 netpoll_send_skb(np, skb);
355}
356#else
357static inline void bond_netpoll_send_skb(const struct slave *slave,
358 struct sk_buff *skb)
359{
360}
361#endif
362
363static inline void bond_set_slave_inactive_flags(struct slave *slave)
364{
365 if (!bond_is_lb(slave->bond))
366 bond_set_backup_slave(slave);
367 if (!slave->bond->params.all_slaves_active)
368 slave->inactive = 1;
369}
370
371static inline void bond_set_slave_active_flags(struct slave *slave)
372{
373 bond_set_active_slave(slave);
374 slave->inactive = 0;
375}
376
377static inline bool bond_is_slave_inactive(struct slave *slave)
378{
379 return slave->inactive;
380}
381
382static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
383{
384 struct in_device *in_dev;
385 __be32 addr = 0;
386
387 rcu_read_lock();
388 in_dev = __in_dev_get_rcu(dev);
389
390 if (in_dev)
391 addr = inet_confirm_addr(in_dev, dst, local, RT_SCOPE_HOST);
392
393 rcu_read_unlock();
394 return addr;
395}
396
397struct bond_net;
398
399struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
400int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
401int bond_create(struct net *net, const char *name);
402int bond_create_sysfs(struct bond_net *net);
403void bond_destroy_sysfs(struct bond_net *net);
404void bond_prepare_sysfs_group(struct bonding *bond);
405int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
406void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
407int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
408int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
409void bond_mii_monitor(struct work_struct *);
410void bond_loadbalance_arp_mon(struct work_struct *);
411void bond_activebackup_arp_mon(struct work_struct *);
412void bond_set_mode_ops(struct bonding *bond, int mode);
413int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
414void bond_select_active_slave(struct bonding *bond);
415void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
416void bond_create_debugfs(void);
417void bond_destroy_debugfs(void);
418void bond_debug_register(struct bonding *bond);
419void bond_debug_unregister(struct bonding *bond);
420void bond_debug_reregister(struct bonding *bond);
421const char *bond_mode_name(int mode);
422
423struct bond_net {
424 struct net * net; /* Associated network namespace */
425 struct list_head dev_list;
426#ifdef CONFIG_PROC_FS
427 struct proc_dir_entry * proc_dir;
428#endif
429 struct class_attribute class_attr_bonding_masters;
430};
431
432#ifdef CONFIG_PROC_FS
433void bond_create_proc_entry(struct bonding *bond);
434void bond_remove_proc_entry(struct bonding *bond);
435void bond_create_proc_dir(struct bond_net *bn);
436void bond_destroy_proc_dir(struct bond_net *bn);
437#else
438static inline void bond_create_proc_entry(struct bonding *bond)
439{
440}
441
442static inline void bond_remove_proc_entry(struct bonding *bond)
443{
444}
445
446static inline void bond_create_proc_dir(struct bond_net *bn)
447{
448}
449
450static inline void bond_destroy_proc_dir(struct bond_net *bn)
451{
452}
453#endif
454
455static inline struct slave *bond_slave_has_mac(struct bonding *bond,
456 const u8 *mac)
457{
458 int i = 0;
459 struct slave *tmp;
460
461 bond_for_each_slave(bond, tmp, i)
462 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
463 return tmp;
464
465 return NULL;
466}
467
468/* exported from bond_main.c */
469extern int bond_net_id;
470extern const struct bond_parm_tbl bond_lacp_tbl[];
471extern const struct bond_parm_tbl bond_mode_tbl[];
472extern const struct bond_parm_tbl xmit_hashtype_tbl[];
473extern const struct bond_parm_tbl arp_validate_tbl[];
474extern const struct bond_parm_tbl fail_over_mac_tbl[];
475extern const struct bond_parm_tbl pri_reselect_tbl[];
476extern struct bond_parm_tbl ad_select_tbl[];
477
478#endif /* _LINUX_BONDING_H */