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 "bond_3ad.h"
26#include "bond_alb.h"
27
28#define DRV_VERSION "3.7.1"
29#define DRV_RELDATE "April 27, 2011"
30#define DRV_NAME "bonding"
31#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
32
33#define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
34
35#define BOND_MAX_ARP_TARGETS 16
36
37#define IS_UP(dev) \
38 ((((dev)->flags & IFF_UP) == IFF_UP) && \
39 netif_running(dev) && \
40 netif_carrier_ok(dev))
41
42/*
43 * Checks whether slave is ready for transmit.
44 */
45#define SLAVE_IS_OK(slave) \
46 (((slave)->dev->flags & IFF_UP) && \
47 netif_running((slave)->dev) && \
48 ((slave)->link == BOND_LINK_UP) && \
49 bond_is_active_slave(slave))
50
51
52#define USES_PRIMARY(mode) \
53 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
54 ((mode) == BOND_MODE_TLB) || \
55 ((mode) == BOND_MODE_ALB))
56
57#define TX_QUEUE_OVERRIDE(mode) \
58 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
59 ((mode) == BOND_MODE_ROUNDROBIN))
60/*
61 * Less bad way to call ioctl from within the kernel; this needs to be
62 * done some other way to get the call out of interrupt context.
63 * Needs "ioctl" variable to be supplied by calling context.
64 */
65#define IOCTL(dev, arg, cmd) ({ \
66 int res = 0; \
67 mm_segment_t fs = get_fs(); \
68 set_fs(get_ds()); \
69 res = ioctl(dev, arg, cmd); \
70 set_fs(fs); \
71 res; })
72
73/**
74 * bond_for_each_slave_from - iterate the slaves list from a starting point
75 * @bond: the bond holding this list.
76 * @pos: current slave.
77 * @cnt: counter for max number of moves
78 * @start: starting point.
79 *
80 * Caller must hold bond->lock
81 */
82#define bond_for_each_slave_from(bond, pos, cnt, start) \
83 for (cnt = 0, pos = start; \
84 cnt < (bond)->slave_cnt; \
85 cnt++, pos = (pos)->next)
86
87/**
88 * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
89 * @bond: the bond holding this list.
90 * @pos: current slave.
91 * @cnt: counter for number max of moves
92 * @start: start point.
93 * @stop: stop point.
94 *
95 * Caller must hold bond->lock
96 */
97#define bond_for_each_slave_from_to(bond, pos, cnt, start, stop) \
98 for (cnt = 0, pos = start; \
99 ((cnt < (bond)->slave_cnt) && (pos != (stop)->next)); \
100 cnt++, pos = (pos)->next)
101
102/**
103 * bond_for_each_slave - iterate the slaves list from head
104 * @bond: the bond holding this list.
105 * @pos: current slave.
106 * @cnt: counter for max number of moves
107 *
108 * Caller must hold bond->lock
109 */
110#define bond_for_each_slave(bond, pos, cnt) \
111 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
112
113
114#ifdef CONFIG_NET_POLL_CONTROLLER
115extern atomic_t netpoll_block_tx;
116
117static inline void block_netpoll_tx(void)
118{
119 atomic_inc(&netpoll_block_tx);
120}
121
122static inline void unblock_netpoll_tx(void)
123{
124 atomic_dec(&netpoll_block_tx);
125}
126
127static inline int is_netpoll_tx_blocked(struct net_device *dev)
128{
129 if (unlikely(netpoll_tx_running(dev)))
130 return atomic_read(&netpoll_block_tx);
131 return 0;
132}
133#else
134#define block_netpoll_tx()
135#define unblock_netpoll_tx()
136#define is_netpoll_tx_blocked(dev) (0)
137#endif
138
139struct bond_params {
140 int mode;
141 int xmit_policy;
142 int miimon;
143 u8 num_peer_notif;
144 int arp_interval;
145 int arp_validate;
146 int use_carrier;
147 int fail_over_mac;
148 int updelay;
149 int downdelay;
150 int lacp_fast;
151 unsigned int min_links;
152 int ad_select;
153 char primary[IFNAMSIZ];
154 int primary_reselect;
155 __be32 arp_targets[BOND_MAX_ARP_TARGETS];
156 int tx_queues;
157 int all_slaves_active;
158 int resend_igmp;
159};
160
161struct bond_parm_tbl {
162 char *modename;
163 int mode;
164};
165
166#define BOND_MAX_MODENAME_LEN 20
167
168struct vlan_entry {
169 struct list_head vlan_list;
170 unsigned short vlan_id;
171};
172
173struct slave {
174 struct net_device *dev; /* first - useful for panic debug */
175 struct slave *next;
176 struct slave *prev;
177 struct bonding *bond; /* our master */
178 int delay;
179 unsigned long jiffies;
180 unsigned long last_arp_rx;
181 s8 link; /* one of BOND_LINK_XXXX */
182 s8 new_link;
183 u8 backup:1, /* indicates backup slave. Value corresponds with
184 BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
185 inactive:1; /* indicates inactive slave */
186 u8 duplex;
187 u32 original_mtu;
188 u32 link_failure_count;
189 u32 speed;
190 u16 queue_id;
191 u8 perm_hwaddr[ETH_ALEN];
192 struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
193 struct tlb_slave_info tlb_info;
194#ifdef CONFIG_NET_POLL_CONTROLLER
195 struct netpoll *np;
196#endif
197};
198
199/*
200 * Link pseudo-state only used internally by monitors
201 */
202#define BOND_LINK_NOCHANGE -1
203
204/*
205 * Here are the locking policies for the two bonding locks:
206 *
207 * 1) Get bond->lock when reading/writing slave list.
208 * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
209 * (It is unnecessary when the write-lock is put with bond->lock.)
210 * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
211 * beforehand.
212 */
213struct bonding {
214 struct net_device *dev; /* first - useful for panic debug */
215 struct slave *first_slave;
216 struct slave *curr_active_slave;
217 struct slave *current_arp_slave;
218 struct slave *primary_slave;
219 bool force_primary;
220 s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
221 void (*recv_probe)(struct sk_buff *, struct bonding *,
222 struct slave *);
223 rwlock_t lock;
224 rwlock_t curr_slave_lock;
225 u8 send_peer_notif;
226 s8 setup_by_slave;
227 s8 igmp_retrans;
228#ifdef CONFIG_PROC_FS
229 struct proc_dir_entry *proc_entry;
230 char proc_file_name[IFNAMSIZ];
231#endif /* CONFIG_PROC_FS */
232 struct list_head bond_list;
233 struct netdev_hw_addr_list mc_list;
234 int (*xmit_hash_policy)(struct sk_buff *, int);
235 u16 rr_tx_counter;
236 struct ad_bond_info ad_info;
237 struct alb_bond_info alb_info;
238 struct bond_params params;
239 struct list_head vlan_list;
240 struct workqueue_struct *wq;
241 struct delayed_work mii_work;
242 struct delayed_work arp_work;
243 struct delayed_work alb_work;
244 struct delayed_work ad_work;
245 struct delayed_work mcast_work;
246#ifdef CONFIG_DEBUG_FS
247 /* debugging suport via debugfs */
248 struct dentry *debug_dir;
249#endif /* CONFIG_DEBUG_FS */
250};
251
252static inline bool bond_vlan_used(struct bonding *bond)
253{
254 return !list_empty(&bond->vlan_list);
255}
256
257#define bond_slave_get_rcu(dev) \
258 ((struct slave *) rcu_dereference(dev->rx_handler_data))
259
260/**
261 * Returns NULL if the net_device does not belong to any of the bond's slaves
262 *
263 * Caller must hold bond lock for read
264 */
265static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
266 struct net_device *slave_dev)
267{
268 struct slave *slave = NULL;
269 int i;
270
271 bond_for_each_slave(bond, slave, i) {
272 if (slave->dev == slave_dev) {
273 return slave;
274 }
275 }
276
277 return NULL;
278}
279
280static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
281{
282 if (!slave || !slave->dev->master) {
283 return NULL;
284 }
285
286 return netdev_priv(slave->dev->master);
287}
288
289static inline bool bond_is_lb(const struct bonding *bond)
290{
291 return (bond->params.mode == BOND_MODE_TLB ||
292 bond->params.mode == BOND_MODE_ALB);
293}
294
295static inline void bond_set_active_slave(struct slave *slave)
296{
297 slave->backup = 0;
298}
299
300static inline void bond_set_backup_slave(struct slave *slave)
301{
302 slave->backup = 1;
303}
304
305static inline int bond_slave_state(struct slave *slave)
306{
307 return slave->backup;
308}
309
310static inline bool bond_is_active_slave(struct slave *slave)
311{
312 return !bond_slave_state(slave);
313}
314
315#define BOND_PRI_RESELECT_ALWAYS 0
316#define BOND_PRI_RESELECT_BETTER 1
317#define BOND_PRI_RESELECT_FAILURE 2
318
319#define BOND_FOM_NONE 0
320#define BOND_FOM_ACTIVE 1
321#define BOND_FOM_FOLLOW 2
322
323#define BOND_ARP_VALIDATE_NONE 0
324#define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
325#define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
326#define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
327 BOND_ARP_VALIDATE_BACKUP)
328
329static inline int slave_do_arp_validate(struct bonding *bond,
330 struct slave *slave)
331{
332 return bond->params.arp_validate & (1 << bond_slave_state(slave));
333}
334
335static inline unsigned long slave_last_rx(struct bonding *bond,
336 struct slave *slave)
337{
338 if (slave_do_arp_validate(bond, slave))
339 return slave->last_arp_rx;
340
341 return slave->dev->last_rx;
342}
343
344#ifdef CONFIG_NET_POLL_CONTROLLER
345static inline void bond_netpoll_send_skb(const struct slave *slave,
346 struct sk_buff *skb)
347{
348 struct netpoll *np = slave->np;
349
350 if (np)
351 netpoll_send_skb(np, skb);
352}
353#else
354static inline void bond_netpoll_send_skb(const struct slave *slave,
355 struct sk_buff *skb)
356{
357}
358#endif
359
360static inline void bond_set_slave_inactive_flags(struct slave *slave)
361{
362 struct bonding *bond = netdev_priv(slave->dev->master);
363 if (!bond_is_lb(bond))
364 bond_set_backup_slave(slave);
365 if (!bond->params.all_slaves_active)
366 slave->inactive = 1;
367}
368
369static inline void bond_set_slave_active_flags(struct slave *slave)
370{
371 bond_set_active_slave(slave);
372 slave->inactive = 0;
373}
374
375static inline bool bond_is_slave_inactive(struct slave *slave)
376{
377 return slave->inactive;
378}
379
380static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
381{
382 struct in_device *in_dev;
383 __be32 addr = 0;
384
385 rcu_read_lock();
386 in_dev = __in_dev_get_rcu(dev);
387
388 if (in_dev)
389 addr = inet_confirm_addr(in_dev, dst, local, RT_SCOPE_HOST);
390
391 rcu_read_unlock();
392 return addr;
393}
394
395struct bond_net;
396
397struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
398int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
399int bond_create(struct net *net, const char *name);
400int bond_create_sysfs(struct bond_net *net);
401void bond_destroy_sysfs(struct bond_net *net);
402void bond_prepare_sysfs_group(struct bonding *bond);
403int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
404void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
405int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
406int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
407void bond_mii_monitor(struct work_struct *);
408void bond_loadbalance_arp_mon(struct work_struct *);
409void bond_activebackup_arp_mon(struct work_struct *);
410void bond_set_mode_ops(struct bonding *bond, int mode);
411int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
412void bond_select_active_slave(struct bonding *bond);
413void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
414void bond_create_debugfs(void);
415void bond_destroy_debugfs(void);
416void bond_debug_register(struct bonding *bond);
417void bond_debug_unregister(struct bonding *bond);
418void bond_debug_reregister(struct bonding *bond);
419const char *bond_mode_name(int mode);
420
421struct bond_net {
422 struct net * net; /* Associated network namespace */
423 struct list_head dev_list;
424#ifdef CONFIG_PROC_FS
425 struct proc_dir_entry * proc_dir;
426#endif
427 struct class_attribute class_attr_bonding_masters;
428};
429
430#ifdef CONFIG_PROC_FS
431void bond_create_proc_entry(struct bonding *bond);
432void bond_remove_proc_entry(struct bonding *bond);
433void bond_create_proc_dir(struct bond_net *bn);
434void bond_destroy_proc_dir(struct bond_net *bn);
435#else
436static inline void bond_create_proc_entry(struct bonding *bond)
437{
438}
439
440static inline void bond_remove_proc_entry(struct bonding *bond)
441{
442}
443
444static inline void bond_create_proc_dir(struct bond_net *bn)
445{
446}
447
448static inline void bond_destroy_proc_dir(struct bond_net *bn)
449{
450}
451#endif
452
453
454/* exported from bond_main.c */
455extern int bond_net_id;
456extern const struct bond_parm_tbl bond_lacp_tbl[];
457extern const struct bond_parm_tbl bond_mode_tbl[];
458extern const struct bond_parm_tbl xmit_hashtype_tbl[];
459extern const struct bond_parm_tbl arp_validate_tbl[];
460extern const struct bond_parm_tbl fail_over_mac_tbl[];
461extern const struct bond_parm_tbl pri_reselect_tbl[];
462extern struct bond_parm_tbl ad_select_tbl[];
463
464#endif /* _LINUX_BONDING_H */