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 "bond_3ad.h"
25#include "bond_alb.h"
26
27#define DRV_VERSION "3.7.1"
28#define DRV_RELDATE "April 27, 2011"
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 slave is ready for transmit.
43 */
44#define SLAVE_IS_OK(slave) \
45 (((slave)->dev->flags & IFF_UP) && \
46 netif_running((slave)->dev) && \
47 ((slave)->link == BOND_LINK_UP) && \
48 bond_is_active_slave(slave))
49
50
51#define USES_PRIMARY(mode) \
52 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
53 ((mode) == BOND_MODE_TLB) || \
54 ((mode) == BOND_MODE_ALB))
55
56#define TX_QUEUE_OVERRIDE(mode) \
57 (((mode) == BOND_MODE_ACTIVEBACKUP) || \
58 ((mode) == BOND_MODE_ROUNDROBIN))
59/*
60 * Less bad way to call ioctl from within the kernel; this needs to be
61 * done some other way to get the call out of interrupt context.
62 * Needs "ioctl" variable to be supplied by calling context.
63 */
64#define IOCTL(dev, arg, cmd) ({ \
65 int res = 0; \
66 mm_segment_t fs = get_fs(); \
67 set_fs(get_ds()); \
68 res = ioctl(dev, arg, cmd); \
69 set_fs(fs); \
70 res; })
71
72/**
73 * bond_for_each_slave_from - iterate the slaves list from a starting point
74 * @bond: the bond holding this list.
75 * @pos: current slave.
76 * @cnt: counter for max number of moves
77 * @start: starting point.
78 *
79 * Caller must hold bond->lock
80 */
81#define bond_for_each_slave_from(bond, pos, cnt, start) \
82 for (cnt = 0, pos = start; \
83 cnt < (bond)->slave_cnt; \
84 cnt++, pos = (pos)->next)
85
86/**
87 * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
88 * @bond: the bond holding this list.
89 * @pos: current slave.
90 * @cnt: counter for number max of moves
91 * @start: start point.
92 * @stop: stop point.
93 *
94 * Caller must hold bond->lock
95 */
96#define bond_for_each_slave_from_to(bond, pos, cnt, start, stop) \
97 for (cnt = 0, pos = start; \
98 ((cnt < (bond)->slave_cnt) && (pos != (stop)->next)); \
99 cnt++, pos = (pos)->next)
100
101/**
102 * bond_for_each_slave - iterate the slaves list from head
103 * @bond: the bond holding this list.
104 * @pos: current slave.
105 * @cnt: counter for max number of moves
106 *
107 * Caller must hold bond->lock
108 */
109#define bond_for_each_slave(bond, pos, cnt) \
110 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
111
112
113#ifdef CONFIG_NET_POLL_CONTROLLER
114extern atomic_t netpoll_block_tx;
115
116static inline void block_netpoll_tx(void)
117{
118 atomic_inc(&netpoll_block_tx);
119}
120
121static inline void unblock_netpoll_tx(void)
122{
123 atomic_dec(&netpoll_block_tx);
124}
125
126static inline int is_netpoll_tx_blocked(struct net_device *dev)
127{
128 if (unlikely(netpoll_tx_running(dev)))
129 return atomic_read(&netpoll_block_tx);
130 return 0;
131}
132#else
133#define block_netpoll_tx()
134#define unblock_netpoll_tx()
135#define is_netpoll_tx_blocked(dev) (0)
136#endif
137
138struct bond_params {
139 int mode;
140 int xmit_policy;
141 int miimon;
142 u8 num_peer_notif;
143 int arp_interval;
144 int arp_validate;
145 int use_carrier;
146 int fail_over_mac;
147 int updelay;
148 int downdelay;
149 int lacp_fast;
150 unsigned int min_links;
151 int ad_select;
152 char primary[IFNAMSIZ];
153 int primary_reselect;
154 __be32 arp_targets[BOND_MAX_ARP_TARGETS];
155 int tx_queues;
156 int all_slaves_active;
157 int resend_igmp;
158};
159
160struct bond_parm_tbl {
161 char *modename;
162 int mode;
163};
164
165#define BOND_MAX_MODENAME_LEN 20
166
167struct vlan_entry {
168 struct list_head vlan_list;
169 __be32 vlan_ip;
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 __be32 master_ip;
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 suport via debugfs */
249 struct dentry *debug_dir;
250#endif /* CONFIG_DEBUG_FS */
251};
252
253static inline bool bond_vlan_used(struct bonding *bond)
254{
255 return !list_empty(&bond->vlan_list);
256}
257
258#define bond_slave_get_rcu(dev) \
259 ((struct slave *) rcu_dereference(dev->rx_handler_data))
260
261/**
262 * Returns NULL if the net_device does not belong to any of the bond's slaves
263 *
264 * Caller must hold bond lock for read
265 */
266static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
267 struct net_device *slave_dev)
268{
269 struct slave *slave = NULL;
270 int i;
271
272 bond_for_each_slave(bond, slave, i) {
273 if (slave->dev == slave_dev) {
274 return slave;
275 }
276 }
277
278 return NULL;
279}
280
281static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
282{
283 if (!slave || !slave->dev->master) {
284 return NULL;
285 }
286
287 return netdev_priv(slave->dev->master);
288}
289
290static inline bool bond_is_lb(const struct bonding *bond)
291{
292 return (bond->params.mode == BOND_MODE_TLB ||
293 bond->params.mode == BOND_MODE_ALB);
294}
295
296static inline void bond_set_active_slave(struct slave *slave)
297{
298 slave->backup = 0;
299}
300
301static inline void bond_set_backup_slave(struct slave *slave)
302{
303 slave->backup = 1;
304}
305
306static inline int bond_slave_state(struct slave *slave)
307{
308 return slave->backup;
309}
310
311static inline bool bond_is_active_slave(struct slave *slave)
312{
313 return !bond_slave_state(slave);
314}
315
316#define BOND_PRI_RESELECT_ALWAYS 0
317#define BOND_PRI_RESELECT_BETTER 1
318#define BOND_PRI_RESELECT_FAILURE 2
319
320#define BOND_FOM_NONE 0
321#define BOND_FOM_ACTIVE 1
322#define BOND_FOM_FOLLOW 2
323
324#define BOND_ARP_VALIDATE_NONE 0
325#define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
326#define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
327#define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
328 BOND_ARP_VALIDATE_BACKUP)
329
330static inline int slave_do_arp_validate(struct bonding *bond,
331 struct slave *slave)
332{
333 return bond->params.arp_validate & (1 << bond_slave_state(slave));
334}
335
336static inline unsigned long slave_last_rx(struct bonding *bond,
337 struct slave *slave)
338{
339 if (slave_do_arp_validate(bond, slave))
340 return slave->last_arp_rx;
341
342 return slave->dev->last_rx;
343}
344
345#ifdef CONFIG_NET_POLL_CONTROLLER
346static inline void bond_netpoll_send_skb(const struct slave *slave,
347 struct sk_buff *skb)
348{
349 struct netpoll *np = slave->np;
350
351 if (np)
352 netpoll_send_skb(np, skb);
353}
354#else
355static inline void bond_netpoll_send_skb(const struct slave *slave,
356 struct sk_buff *skb)
357{
358}
359#endif
360
361static inline void bond_set_slave_inactive_flags(struct slave *slave)
362{
363 struct bonding *bond = netdev_priv(slave->dev->master);
364 if (!bond_is_lb(bond))
365 bond_set_backup_slave(slave);
366 if (!bond->params.all_slaves_active)
367 slave->inactive = 1;
368}
369
370static inline void bond_set_slave_active_flags(struct slave *slave)
371{
372 bond_set_active_slave(slave);
373 slave->inactive = 0;
374}
375
376static inline bool bond_is_slave_inactive(struct slave *slave)
377{
378 return slave->inactive;
379}
380
381struct bond_net;
382
383struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
384int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
385int bond_create(struct net *net, const char *name);
386int bond_create_sysfs(struct bond_net *net);
387void bond_destroy_sysfs(struct bond_net *net);
388void bond_prepare_sysfs_group(struct bonding *bond);
389int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
390void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
391int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
392int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
393void bond_mii_monitor(struct work_struct *);
394void bond_loadbalance_arp_mon(struct work_struct *);
395void bond_activebackup_arp_mon(struct work_struct *);
396void bond_set_mode_ops(struct bonding *bond, int mode);
397int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
398void bond_select_active_slave(struct bonding *bond);
399void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
400void bond_create_debugfs(void);
401void bond_destroy_debugfs(void);
402void bond_debug_register(struct bonding *bond);
403void bond_debug_unregister(struct bonding *bond);
404void bond_debug_reregister(struct bonding *bond);
405const char *bond_mode_name(int mode);
406
407struct bond_net {
408 struct net * net; /* Associated network namespace */
409 struct list_head dev_list;
410#ifdef CONFIG_PROC_FS
411 struct proc_dir_entry * proc_dir;
412#endif
413 struct class_attribute class_attr_bonding_masters;
414};
415
416#ifdef CONFIG_PROC_FS
417void bond_create_proc_entry(struct bonding *bond);
418void bond_remove_proc_entry(struct bonding *bond);
419void bond_create_proc_dir(struct bond_net *bn);
420void bond_destroy_proc_dir(struct bond_net *bn);
421#else
422static inline void bond_create_proc_entry(struct bonding *bond)
423{
424}
425
426static inline void bond_remove_proc_entry(struct bonding *bond)
427{
428}
429
430static inline void bond_create_proc_dir(struct bond_net *bn)
431{
432}
433
434static inline void bond_destroy_proc_dir(struct bond_net *bn)
435{
436}
437#endif
438
439
440/* exported from bond_main.c */
441extern int bond_net_id;
442extern const struct bond_parm_tbl bond_lacp_tbl[];
443extern const struct bond_parm_tbl bond_mode_tbl[];
444extern const struct bond_parm_tbl xmit_hashtype_tbl[];
445extern const struct bond_parm_tbl arp_validate_tbl[];
446extern const struct bond_parm_tbl fail_over_mac_tbl[];
447extern const struct bond_parm_tbl pri_reselect_tbl[];
448extern struct bond_parm_tbl ad_select_tbl[];
449
450#endif /* _LINUX_BONDING_H */