bond_main.c 131 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
/*
 * originally based on the dummy device.
 *
 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
 *
 * bonding.c: an Ethernet Bonding driver
 *
 * This is useful to talk to a Cisco EtherChannel compatible equipment:
 *	Cisco 5500
 *	Sun Trunking (Solaris)
 *	Alteon AceDirector Trunks
 *	Linux Bonding
 *	and probably many L2 switches ...
 *
 * How it works:
 *    ifconfig bond0 ipaddress netmask up
 *      will setup a network device, with an ip address.  No mac address
 *	will be assigned at this time.  The hw mac address will come from
 *	the first slave bonded to the channel.  All slaves will then use
 *	this hw mac address.
 *
 *    ifconfig bond0 down
 *         will release all slaves, marking them as down.
 *
 *    ifenslave bond0 eth0
 *	will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
 *	a: be used as initial mac address
 *	b: if a hw mac address already is there, eth0's hw mac address
 *	   will then be set from bond0.
 *
 */

34
35
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

Linus Torvalds's avatar
Linus Torvalds committed
36
37
38
39
40
41
42
43
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
44
#include <net/ip.h>
Linus Torvalds's avatar
Linus Torvalds committed
45
#include <linux/ip.h>
46
47
#include <linux/tcp.h>
#include <linux/udp.h>
Linus Torvalds's avatar
Linus Torvalds committed
48
49
50
51
52
53
54
55
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/socket.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/bitops.h>
Stephen Hemminger's avatar
Stephen Hemminger committed
56
#include <linux/io.h>
Linus Torvalds's avatar
Linus Torvalds committed
57
#include <asm/dma.h>
Stephen Hemminger's avatar
Stephen Hemminger committed
58
#include <linux/uaccess.h>
Linus Torvalds's avatar
Linus Torvalds committed
59
60
61
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
62
#include <linux/igmp.h>
Linus Torvalds's avatar
Linus Torvalds committed
63
64
65
66
67
68
69
70
71
72
73
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/smp.h>
#include <linux/if_ether.h>
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
David Sterba's avatar
David Sterba committed
74
#include <linux/jiffies.h>
75
#include <linux/preempt.h>
Jay Vosburgh's avatar
Jay Vosburgh committed
76
#include <net/route.h>
77
#include <net/net_namespace.h>
78
#include <net/netns/generic.h>
79
#include <net/pkt_sched.h>
Linus Torvalds's avatar
Linus Torvalds committed
80
81
82
83
84
85
86
87
88
89
90
#include "bonding.h"
#include "bond_3ad.h"
#include "bond_alb.h"

/*---------------------------- Module parameters ----------------------------*/

/* monitor all links that often (in milliseconds). <=0 disables monitoring */
#define BOND_LINK_MON_INTERV	0
#define BOND_LINK_ARP_INTERV	0

static int max_bonds	= BOND_DEFAULT_MAX_BONDS;
91
static int tx_queues	= BOND_DEFAULT_TX_QUEUES;
92
static int num_peer_notif = 1;
Linus Torvalds's avatar
Linus Torvalds committed
93
static int miimon	= BOND_LINK_MON_INTERV;
Stephen Hemminger's avatar
Stephen Hemminger committed
94
95
static int updelay;
static int downdelay;
Linus Torvalds's avatar
Linus Torvalds committed
96
static int use_carrier	= 1;
Stephen Hemminger's avatar
Stephen Hemminger committed
97
98
static char *mode;
static char *primary;
99
static char *primary_reselect;
Stephen Hemminger's avatar
Stephen Hemminger committed
100
static char *lacp_rate;
101
static int min_links;
Stephen Hemminger's avatar
Stephen Hemminger committed
102
103
static char *ad_select;
static char *xmit_hash_policy;
Linus Torvalds's avatar
Linus Torvalds committed
104
static int arp_interval = BOND_LINK_ARP_INTERV;
Stephen Hemminger's avatar
Stephen Hemminger committed
105
106
107
static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *fail_over_mac;
108
static int all_slaves_active = 0;
109
static struct bond_params bonding_defaults;
110
static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
Linus Torvalds's avatar
Linus Torvalds committed
111
112
113

module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
114
115
module_param(tx_queues, int, 0);
MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
116
module_param_named(num_grat_arp, num_peer_notif, int, 0644);
117
118
MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
			       "failover event (alias of num_unsol_na)");
119
module_param_named(num_unsol_na, num_peer_notif, int, 0644);
120
121
MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
			       "failover event (alias of num_grat_arp)");
Linus Torvalds's avatar
Linus Torvalds committed
122
123
124
125
126
module_param(miimon, int, 0);
MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
module_param(updelay, int, 0);
MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
module_param(downdelay, int, 0);
127
128
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
			    "in milliseconds");
Linus Torvalds's avatar
Linus Torvalds committed
129
module_param(use_carrier, int, 0);
130
131
MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
			      "0 for off, 1 for on (default)");
Linus Torvalds's avatar
Linus Torvalds committed
132
module_param(mode, charp, 0);
133
MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
134
135
136
		       "1 for active-backup, 2 for balance-xor, "
		       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
		       "6 for balance-alb");
Linus Torvalds's avatar
Linus Torvalds committed
137
138
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
139
140
141
142
143
144
145
146
module_param(primary_reselect, charp, 0);
MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
				   "once it comes up; "
				   "0 for always (default), "
				   "1 for only if speed of primary is "
				   "better, "
				   "2 for only on active slave "
				   "failure");
Linus Torvalds's avatar
Linus Torvalds committed
147
module_param(lacp_rate, charp, 0);
148
149
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
			    "0 for slow, 1 for fast");
150
module_param(ad_select, charp, 0);
151
152
153
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
			    "0 for stable (default), 1 for bandwidth, "
			    "2 for count");
154
155
156
module_param(min_links, int, 0);
MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");

157
module_param(xmit_hash_policy, charp, 0);
158
159
160
MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
				   "0 for layer 2 (default), 1 for layer 3+4, "
				   "2 for layer 2+3");
Linus Torvalds's avatar
Linus Torvalds committed
161
162
163
164
module_param(arp_interval, int, 0);
MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
module_param_array(arp_ip_target, charp, NULL, 0);
MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
165
module_param(arp_validate, charp, 0);
166
167
168
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
			       "0 for none (default), 1 for active, "
			       "2 for backup, 3 for all");
169
module_param(fail_over_mac, charp, 0);
170
171
172
MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
				"the same MAC; 0 for none (default), "
				"1 for active, 2 for follow");
173
174
module_param(all_slaves_active, int, 0);
MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
175
				     "by setting active flag for all slaves; "
176
				     "0 for never (default), 1 for always.");
177
module_param(resend_igmp, int, 0);
178
179
MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
			      "link failure");
Linus Torvalds's avatar
Linus Torvalds committed
180
181
182

/*----------------------------- Global variables ----------------------------*/

183
#ifdef CONFIG_NET_POLL_CONTROLLER
184
atomic_t netpoll_block_tx = ATOMIC_INIT(0);
185
186
#endif

187
int bond_net_id __read_mostly;
Linus Torvalds's avatar
Linus Torvalds committed
188

Stephen Hemminger's avatar
Stephen Hemminger committed
189
190
static __be32 arp_target[BOND_MAX_ARP_TARGETS];
static int arp_ip_count;
Linus Torvalds's avatar
Linus Torvalds committed
191
static int bond_mode	= BOND_MODE_ROUNDROBIN;
Stephen Hemminger's avatar
Stephen Hemminger committed
192
193
static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;
Linus Torvalds's avatar
Linus Torvalds committed
194

195
const struct bond_parm_tbl bond_lacp_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
196
197
198
199
200
{	"slow",		AD_LACP_SLOW},
{	"fast",		AD_LACP_FAST},
{	NULL,		-1},
};

201
const struct bond_parm_tbl bond_mode_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
202
203
204
205
206
207
208
209
210
211
{	"balance-rr",		BOND_MODE_ROUNDROBIN},
{	"active-backup",	BOND_MODE_ACTIVEBACKUP},
{	"balance-xor",		BOND_MODE_XOR},
{	"broadcast",		BOND_MODE_BROADCAST},
{	"802.3ad",		BOND_MODE_8023AD},
{	"balance-tlb",		BOND_MODE_TLB},
{	"balance-alb",		BOND_MODE_ALB},
{	NULL,			-1},
};

212
const struct bond_parm_tbl xmit_hashtype_tbl[] = {
213
214
{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
215
{	"layer2+3",		BOND_XMIT_POLICY_LAYER23},
216
217
218
{	NULL,			-1},
};

219
const struct bond_parm_tbl arp_validate_tbl[] = {
220
221
222
223
224
225
226
{	"none",			BOND_ARP_VALIDATE_NONE},
{	"active",		BOND_ARP_VALIDATE_ACTIVE},
{	"backup",		BOND_ARP_VALIDATE_BACKUP},
{	"all",			BOND_ARP_VALIDATE_ALL},
{	NULL,			-1},
};

227
const struct bond_parm_tbl fail_over_mac_tbl[] = {
228
229
230
231
232
233
{	"none",			BOND_FOM_NONE},
{	"active",		BOND_FOM_ACTIVE},
{	"follow",		BOND_FOM_FOLLOW},
{	NULL,			-1},
};

234
235
236
237
238
239
240
const struct bond_parm_tbl pri_reselect_tbl[] = {
{	"always",		BOND_PRI_RESELECT_ALWAYS},
{	"better",		BOND_PRI_RESELECT_BETTER},
{	"failure",		BOND_PRI_RESELECT_FAILURE},
{	NULL,			-1},
};

241
242
243
244
245
246
247
struct bond_parm_tbl ad_select_tbl[] = {
{	"stable",	BOND_AD_STABLE},
{	"bandwidth",	BOND_AD_BANDWIDTH},
{	"count",	BOND_AD_COUNT},
{	NULL,		-1},
};

Linus Torvalds's avatar
Linus Torvalds committed
248
249
/*-------------------------- Forward declarations ---------------------------*/

250
static int bond_init(struct net_device *bond_dev);
251
static void bond_uninit(struct net_device *bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
252
253
254

/*---------------------------- General routines -----------------------------*/

255
const char *bond_mode_name(int mode)
Linus Torvalds's avatar
Linus Torvalds committed
256
{
257
258
259
260
261
	static const char *names[] = {
		[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
		[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
		[BOND_MODE_XOR] = "load balancing (xor)",
		[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
Stephen Hemminger's avatar
Stephen Hemminger committed
262
		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
263
264
265
266
267
		[BOND_MODE_TLB] = "transmit load balancing",
		[BOND_MODE_ALB] = "adaptive load balancing",
	};

	if (mode < 0 || mode > BOND_MODE_ALB)
Linus Torvalds's avatar
Linus Torvalds committed
268
		return "unknown";
269
270

	return names[mode];
Linus Torvalds's avatar
Linus Torvalds committed
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
}

/*---------------------------------- VLAN -----------------------------------*/

/**
 * bond_add_vlan - add a new vlan id on bond
 * @bond: bond that got the notification
 * @vlan_id: the vlan id to add
 *
 * Returns -ENOMEM if allocation failed.
 */
static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
{
	struct vlan_entry *vlan;

286
	pr_debug("bond: %s, vlan id %d\n",
287
		 (bond ? bond->dev->name : "None"), vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
288

289
	vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
Stephen Hemminger's avatar
Stephen Hemminger committed
290
	if (!vlan)
Linus Torvalds's avatar
Linus Torvalds committed
291
292
293
294
295
296
297
298
299
300
301
		return -ENOMEM;

	INIT_LIST_HEAD(&vlan->vlan_list);
	vlan->vlan_id = vlan_id;

	write_lock_bh(&bond->lock);

	list_add_tail(&vlan->vlan_list, &bond->vlan_list);

	write_unlock_bh(&bond->lock);

302
	pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
303
304
305
306
307
308
309
310
311
312
313
314
315

	return 0;
}

/**
 * bond_del_vlan - delete a vlan id from bond
 * @bond: bond that got the notification
 * @vlan_id: the vlan id to delete
 *
 * returns -ENODEV if @vlan_id was not found in @bond.
 */
static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
{
316
	struct vlan_entry *vlan;
Linus Torvalds's avatar
Linus Torvalds committed
317
318
	int res = -ENODEV;

319
	pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
320

321
	block_netpoll_tx();
Linus Torvalds's avatar
Linus Torvalds committed
322
323
	write_lock_bh(&bond->lock);

324
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
Linus Torvalds's avatar
Linus Torvalds committed
325
326
327
		if (vlan->vlan_id == vlan_id) {
			list_del(&vlan->vlan_list);

328
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
329
330
				bond_alb_clear_vlan(bond, vlan_id);

331
332
			pr_debug("removed VLAN ID %d from bond %s\n",
				 vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
333
334
335
336
337
338
339
340

			kfree(vlan);

			res = 0;
			goto out;
		}
	}

341
342
	pr_debug("couldn't find VLAN ID %d in bond %s\n",
		 vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
343
344
345

out:
	write_unlock_bh(&bond->lock);
346
	unblock_netpoll_tx();
Linus Torvalds's avatar
Linus Torvalds committed
347
348
349
350
351
352
353
354
355
356
	return res;
}

/**
 * bond_next_vlan - safely skip to the next item in the vlans list.
 * @bond: the bond we're working on
 * @curr: item we're advancing from
 *
 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 * or @curr->next otherwise (even if it is @curr itself again).
Stephen Hemminger's avatar
Stephen Hemminger committed
357
 *
Linus Torvalds's avatar
Linus Torvalds committed
358
359
360
361
362
363
 * Caller must hold bond->lock
 */
struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
{
	struct vlan_entry *next, *last;

Stephen Hemminger's avatar
Stephen Hemminger committed
364
	if (list_empty(&bond->vlan_list))
Linus Torvalds's avatar
Linus Torvalds committed
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
		return NULL;

	if (!curr) {
		next = list_entry(bond->vlan_list.next,
				  struct vlan_entry, vlan_list);
	} else {
		last = list_entry(bond->vlan_list.prev,
				  struct vlan_entry, vlan_list);
		if (last == curr) {
			next = list_entry(bond->vlan_list.next,
					  struct vlan_entry, vlan_list);
		} else {
			next = list_entry(curr->vlan_list.next,
					  struct vlan_entry, vlan_list);
		}
	}

	return next;
}

/**
 * bond_dev_queue_xmit - Prepare skb for xmit.
Stephen Hemminger's avatar
Stephen Hemminger committed
387
 *
Linus Torvalds's avatar
Linus Torvalds committed
388
389
390
391
 * @bond: bond device that got this skb for tx.
 * @skb: hw accel VLAN tagged skb to transmit
 * @slave_dev: slave that is supposed to xmit this skbuff
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
392
393
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
			struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
394
{
395
	skb->dev = slave_dev;
396

397
	BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
398
399
		     sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
	skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
400

401
	if (unlikely(netpoll_tx_running(bond->dev)))
402
		bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
403
	else
404
		dev_queue_xmit(skb);
Linus Torvalds's avatar
Linus Torvalds committed
405
406
407
408
409

	return 0;
}

/*
Jiri Pirko's avatar
Jiri Pirko committed
410
411
 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 * We don't protect the slave list iteration with a lock because:
Linus Torvalds's avatar
Linus Torvalds committed
412
413
414
415
 * a. This operation is performed in IOCTL context,
 * b. The operation is protected by the RTNL semaphore in the 8021q code,
 * c. Holding a lock with BH disabled while directly calling a base driver
 *    entry point is generally a BAD idea.
Stephen Hemminger's avatar
Stephen Hemminger committed
416
 *
Linus Torvalds's avatar
Linus Torvalds committed
417
418
419
420
421
422
423
424
425
426
427
428
429
430
 * The design of synchronization/protection for this operation in the 8021q
 * module is good for one or more VLAN devices over a single physical device
 * and cannot be extended for a teaming solution like bonding, so there is a
 * potential race condition here where a net device from the vlan group might
 * be referenced (either by a base driver or the 8021q code) while it is being
 * removed from the system. However, it turns out we're not making matters
 * worse, and if it works for regular VLAN usage it will work here too.
*/

/**
 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 * @bond_dev: bonding net device that got called
 * @vid: vlan id being added
 */
431
432
static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
				__be16 proto, u16 vid)
Linus Torvalds's avatar
Linus Torvalds committed
433
{
434
	struct bonding *bond = netdev_priv(bond_dev);
435
	struct slave *slave, *stop_at;
Linus Torvalds's avatar
Linus Torvalds committed
436
437
438
	int i, res;

	bond_for_each_slave(bond, slave, i) {
439
		res = vlan_vid_add(slave->dev, proto, vid);
440
441
		if (res)
			goto unwind;
Linus Torvalds's avatar
Linus Torvalds committed
442
443
444
445
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
446
		pr_err("%s: Error: Failed to add vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
447
		       bond_dev->name, vid);
448
		return res;
Linus Torvalds's avatar
Linus Torvalds committed
449
	}
450
451

	return 0;
452
453
454
455
456

unwind:
	/* unwind from head to the slave that failed */
	stop_at = slave;
	bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
457
		vlan_vid_del(slave->dev, proto, vid);
458
459

	return res;
Linus Torvalds's avatar
Linus Torvalds committed
460
461
462
463
464
465
466
}

/**
 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 * @bond_dev: bonding net device that got called
 * @vid: vlan id being removed
 */
467
468
static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
				 __be16 proto, u16 vid)
Linus Torvalds's avatar
Linus Torvalds committed
469
{
470
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
471
472
473
	struct slave *slave;
	int i, res;

474
	bond_for_each_slave(bond, slave, i)
475
		vlan_vid_del(slave->dev, proto, vid);
Linus Torvalds's avatar
Linus Torvalds committed
476
477
478

	res = bond_del_vlan(bond, vid);
	if (res) {
479
		pr_err("%s: Error: Failed to remove vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
480
		       bond_dev->name, vid);
481
		return res;
Linus Torvalds's avatar
Linus Torvalds committed
482
	}
483
484

	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
485
486
487
488
489
}

static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;
490
	int res;
Linus Torvalds's avatar
Linus Torvalds committed
491

492
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
493
494
		res = vlan_vid_add(slave_dev, htons(ETH_P_8021Q),
				   vlan->vlan_id);
495
496
497
498
499
		if (res)
			pr_warning("%s: Failed to add vlan id %d to device %s\n",
				   bond->dev->name, vlan->vlan_id,
				   slave_dev->name);
	}
Linus Torvalds's avatar
Linus Torvalds committed
500
501
}

Stephen Hemminger's avatar
Stephen Hemminger committed
502
503
static void bond_del_vlans_from_slave(struct bonding *bond,
				      struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
504
505
506
507
{
	struct vlan_entry *vlan;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
508
509
		if (!vlan->vlan_id)
			continue;
510
		vlan_vid_del(slave_dev, htons(ETH_P_8021Q), vlan->vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
511
512
513
514
515
	}
}

/*------------------------------- Link status -------------------------------*/

516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
/*
 * Set the carrier state for the master according to the state of its
 * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 * do special 802.3ad magic.
 *
 * Returns zero if carrier state does not change, nonzero if it does.
 */
static int bond_set_carrier(struct bonding *bond)
{
	struct slave *slave;
	int i;

	if (bond->slave_cnt == 0)
		goto down;

	if (bond->params.mode == BOND_MODE_8023AD)
		return bond_3ad_set_carrier(bond);

	bond_for_each_slave(bond, slave, i) {
		if (slave->link == BOND_LINK_UP) {
			if (!netif_carrier_ok(bond->dev)) {
				netif_carrier_on(bond->dev);
				return 1;
			}
			return 0;
		}
	}

down:
	if (netif_carrier_ok(bond->dev)) {
		netif_carrier_off(bond->dev);
		return 1;
	}
	return 0;
}

Linus Torvalds's avatar
Linus Torvalds committed
552
553
554
/*
 * Get link speed and duplex from the slave's base driver
 * using ethtool. If for some reason the call fails or the
555
 * values are invalid, set speed and duplex to -1,
556
 * and return.
Linus Torvalds's avatar
Linus Torvalds committed
557
 */
558
static void bond_update_speed_duplex(struct slave *slave)
Linus Torvalds's avatar
Linus Torvalds committed
559
560
{
	struct net_device *slave_dev = slave->dev;
561
	struct ethtool_cmd ecmd;
562
	u32 slave_speed;
563
	int res;
Linus Torvalds's avatar
Linus Torvalds committed
564

565
566
	slave->speed = SPEED_UNKNOWN;
	slave->duplex = DUPLEX_UNKNOWN;
Linus Torvalds's avatar
Linus Torvalds committed
567

568
	res = __ethtool_get_settings(slave_dev, &ecmd);
569
	if (res < 0)
570
		return;
Linus Torvalds's avatar
Linus Torvalds committed
571

572
	slave_speed = ethtool_cmd_speed(&ecmd);
Jiri Pirko's avatar
Jiri Pirko committed
573
	if (slave_speed == 0 || slave_speed == ((__u32) -1))
574
		return;
Linus Torvalds's avatar
Linus Torvalds committed
575

576
	switch (ecmd.duplex) {
Linus Torvalds's avatar
Linus Torvalds committed
577
578
579
580
	case DUPLEX_FULL:
	case DUPLEX_HALF:
		break;
	default:
581
		return;
Linus Torvalds's avatar
Linus Torvalds committed
582
583
	}

584
	slave->speed = slave_speed;
585
	slave->duplex = ecmd.duplex;
Linus Torvalds's avatar
Linus Torvalds committed
586

587
	return;
Linus Torvalds's avatar
Linus Torvalds committed
588
589
590
591
592
593
}

/*
 * if <dev> supports MII link status reporting, check its link status.
 *
 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
Stephen Hemminger's avatar
Stephen Hemminger committed
594
 * depending upon the setting of the use_carrier parameter.
Linus Torvalds's avatar
Linus Torvalds committed
595
596
597
598
599
600
601
602
603
604
605
 *
 * Return either BMSR_LSTATUS, meaning that the link is up (or we
 * can't tell and just pretend it is), or 0, meaning that the link is
 * down.
 *
 * If reporting is non-zero, instead of faking link up, return -1 if
 * both ETHTOOL and MII ioctls fail (meaning the device does not
 * support them).  If use_carrier is set, return whatever it says.
 * It'd be nice if there was a good way to tell if a driver supports
 * netif_carrier, but there really isn't.
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
606
607
static int bond_check_dev_link(struct bonding *bond,
			       struct net_device *slave_dev, int reporting)
Linus Torvalds's avatar
Linus Torvalds committed
608
{
609
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
610
	int (*ioctl)(struct net_device *, struct ifreq *, int);
Linus Torvalds's avatar
Linus Torvalds committed
611
612
613
	struct ifreq ifr;
	struct mii_ioctl_data *mii;

614
615
616
	if (!reporting && !netif_running(slave_dev))
		return 0;

617
	if (bond->params.use_carrier)
Linus Torvalds's avatar
Linus Torvalds committed
618
619
		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;

620
	/* Try to get link status using Ethtool first. */
621
622
623
	if (slave_dev->ethtool_ops->get_link)
		return slave_dev->ethtool_ops->get_link(slave_dev) ?
			BMSR_LSTATUS : 0;
624

Stephen Hemminger's avatar
Stephen Hemminger committed
625
	/* Ethtool can't be used, fallback to MII ioctls. */
626
	ioctl = slave_ops->ndo_do_ioctl;
Linus Torvalds's avatar
Linus Torvalds committed
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
	if (ioctl) {
		/* TODO: set pointer to correct ioctl on a per team member */
		/*       bases to make this more efficient. that is, once  */
		/*       we determine the correct ioctl, we will always    */
		/*       call it and not the others for that team          */
		/*       member.                                           */

		/*
		 * We cannot assume that SIOCGMIIPHY will also read a
		 * register; not all network drivers (e.g., e100)
		 * support that.
		 */

		/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
		strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
		mii = if_mii(&ifr);
		if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
			mii->reg_num = MII_BMSR;
Stephen Hemminger's avatar
Stephen Hemminger committed
645
646
			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
				return mii->val_out & BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
647
648
649
650
651
		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
652
	 * or both SIOCGMIIREG and get_link failed (meaning that we
Linus Torvalds's avatar
Linus Torvalds committed
653
654
655
	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
Stephen Hemminger's avatar
Stephen Hemminger committed
656
	return reporting ? -1 : BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
657
658
659
660
661
662
663
}

/*----------------------------- Multicast list ------------------------------*/

/*
 * Push the promiscuity flag down to appropriate slaves
 */
664
static int bond_set_promiscuity(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
665
{
666
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
667
668
669
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
670
671
			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
Linus Torvalds's avatar
Linus Torvalds committed
672
673
674
675
676
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
677
678
679
			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
680
681
		}
	}
682
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
683
684
685
686
687
}

/*
 * Push the allmulti flag down to all slaves
 */
688
static int bond_set_allmulti(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
689
{
690
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
691
692
693
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
694
695
			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
Linus Torvalds's avatar
Linus Torvalds committed
696
697
698
699
700
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
701
702
703
			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
704
705
		}
	}
706
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
707
708
}

709
static void __bond_resend_igmp_join_requests(struct net_device *dev)
710
711
712
{
	struct in_device *in_dev;

713
	in_dev = __in_dev_get_rcu(dev);
Eric Dumazet's avatar
Eric Dumazet committed
714
	if (in_dev)
715
		ip_mc_rejoin_groups(in_dev);
716
717
}

718
719
720
721
722
723
724
/*
 * Retrieve the list of registered multicast addresses for the bonding
 * device and retransmit an IGMP JOIN request to the current active
 * slave.
 */
static void bond_resend_igmp_join_requests(struct bonding *bond)
{
725
	struct net_device *bond_dev, *vlan_dev, *upper_dev;
726
727
728
	struct vlan_entry *vlan;

	read_lock(&bond->lock);
729
	rcu_read_lock();
730

731
732
	bond_dev = bond->dev;

733
	/* rejoin all groups on bond device */
734
735
736
737
738
739
	__bond_resend_igmp_join_requests(bond_dev);

	/*
	 * if bond is enslaved to a bridge,
	 * then rejoin all groups on its master
	 */
740
741
742
	upper_dev = netdev_master_upper_dev_get_rcu(bond_dev);
	if (upper_dev && upper_dev->priv_flags & IFF_EBRIDGE)
		__bond_resend_igmp_join_requests(upper_dev);
743
744

	/* rejoin all groups on vlan devices */
Jiri Pirko's avatar
Jiri Pirko committed
745
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
746
		vlan_dev = __vlan_find_dev_deep(bond_dev, htons(ETH_P_8021Q),
Jiri Pirko's avatar
Jiri Pirko committed
747
748
749
						vlan->vlan_id);
		if (vlan_dev)
			__bond_resend_igmp_join_requests(vlan_dev);
750
	}
751
	rcu_read_unlock();
752

753
754
755
756
757
758
759
	/* We use curr_slave_lock to protect against concurrent access to
	 * igmp_retrans from multiple running instances of this function and
	 * bond_change_active_slave
	 */
	write_lock_bh(&bond->curr_slave_lock);
	if (bond->igmp_retrans > 1) {
		bond->igmp_retrans--;
760
		queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
761
762
	}
	write_unlock_bh(&bond->curr_slave_lock);
763
764
765
	read_unlock(&bond->lock);
}

766
static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
767
768
{
	struct bonding *bond = container_of(work, struct bonding,
769
					    mcast_work.work);
770

771
772
773
	bond_resend_igmp_join_requests(bond);
}

774
/* Flush bond's hardware addresses from slave
Linus Torvalds's avatar
Linus Torvalds committed
775
 */
776
static void bond_hw_addr_flush(struct net_device *bond_dev,
Stephen Hemminger's avatar
Stephen Hemminger committed
777
			       struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
778
{
779
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
780

781
782
	dev_uc_unsync(slave_dev, bond_dev);
	dev_mc_unsync(slave_dev, bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
783
784
785
786
787

	if (bond->params.mode == BOND_MODE_8023AD) {
		/* del lacpdu mc addr from mc list */
		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;

788
		dev_mc_del(slave_dev, lacpdu_multicast);
Linus Torvalds's avatar
Linus Torvalds committed
789
790
791
792
793
	}
}

/*--------------------------- Active slave change ---------------------------*/

794
795
796
797
/* Update the hardware address list and promisc/allmulti for the new and
 * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
 * slaves up date at all times; only the USES_PRIMARY modes need to call
 * this function to swap these settings during a failover.
Linus Torvalds's avatar
Linus Torvalds committed
798
 */
799
800
static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
			      struct slave *old_active)
Linus Torvalds's avatar
Linus Torvalds committed
801
802
{
	if (old_active) {
Stephen Hemminger's avatar
Stephen Hemminger committed
803
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
804
805
			dev_set_promiscuity(old_active->dev, -1);

Stephen Hemminger's avatar
Stephen Hemminger committed
806
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
807
808
			dev_set_allmulti(old_active->dev, -1);

809
		bond_hw_addr_flush(bond->dev, old_active->dev);
Linus Torvalds's avatar
Linus Torvalds committed
810
811
812
	}

	if (new_active) {
813
		/* FIXME: Signal errors upstream. */
Stephen Hemminger's avatar
Stephen Hemminger committed
814
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
815
816
			dev_set_promiscuity(new_active->dev, 1);

Stephen Hemminger's avatar
Stephen Hemminger committed
817
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
818
819
			dev_set_allmulti(new_active->dev, 1);

820
		netif_addr_lock_bh(bond->dev);
821
822
		dev_uc_sync(new_active->dev, bond->dev);
		dev_mc_sync(new_active->dev, bond->dev);
823
		netif_addr_unlock_bh(bond->dev);
Linus Torvalds's avatar
Linus Torvalds committed
824
825
826
	}
}

827
828
829
830
831
832
833
834
835
836
/*
 * bond_do_fail_over_mac
 *
 * Perform special MAC address swapping for fail_over_mac settings
 *
 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 */
static void bond_do_fail_over_mac(struct bonding *bond,
				  struct slave *new_active,
				  struct slave *old_active)
837
838
839
840
	__releases(&bond->curr_slave_lock)
	__releases(&bond->lock)
	__acquires(&bond->lock)
	__acquires(&bond->curr_slave_lock)
841
842
843
844
845
846
847
{
	u8 tmp_mac[ETH_ALEN];
	struct sockaddr saddr;
	int rv;

	switch (bond->params.fail_over_mac) {
	case BOND_FOM_ACTIVE:
848
		if (new_active) {
849
850
			memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
			       new_active->dev->addr_len);
851
852
853
854
855
856
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);
			call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
		}
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
		break;
	case BOND_FOM_FOLLOW:
		/*
		 * if new_active && old_active, swap them
		 * if just old_active, do nothing (going to no active slave)
		 * if just new_active, set new_active to bond's MAC
		 */
		if (!new_active)
			return;

		write_unlock_bh(&bond->curr_slave_lock);
		read_unlock(&bond->lock);

		if (old_active) {
			memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
			memcpy(saddr.sa_data, old_active->dev->dev_addr,
			       ETH_ALEN);
			saddr.sa_family = new_active->dev->type;
		} else {
			memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
			saddr.sa_family = bond->dev->type;
		}

		rv = dev_set_mac_address(new_active->dev, &saddr);
		if (rv) {
882
			pr_err("%s: Error %d setting MAC of slave %s\n",
883
884
885
886
887
888
889
890
891
892
893
894
			       bond->dev->name, -rv, new_active->dev->name);
			goto out;
		}

		if (!old_active)
			goto out;

		memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
		saddr.sa_family = old_active->dev->type;

		rv = dev_set_mac_address(old_active->dev, &saddr);
		if (rv)
895
			pr_err("%s: Error %d setting MAC of slave %s\n",
896
897
898
899
900
901
			       bond->dev->name, -rv, new_active->dev->name);
out:
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);
		break;
	default:
902
		pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
903
904
905
906
907
908
		       bond->dev->name, bond->params.fail_over_mac);
		break;
	}

}

909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
static bool bond_should_change_active(struct bonding *bond)
{
	struct slave *prim = bond->primary_slave;
	struct slave *curr = bond->curr_active_slave;

	if (!prim || !curr || curr->link != BOND_LINK_UP)
		return true;
	if (bond->force_primary) {
		bond->force_primary = false;
		return true;
	}
	if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
	    (prim->speed < curr->speed ||
	     (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
		return false;
	if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
		return false;
	return true;
}
928

Linus Torvalds's avatar
Linus Torvalds committed
929
930
931
932
933
934
935
936
937
938
939
940
941
/**
 * find_best_interface - select the best available slave to be the active one
 * @bond: our bonding struct
 *
 * Warning: Caller must hold curr_slave_lock for writing.
 */
static struct slave *bond_find_best_slave(struct bonding *bond)
{
	struct slave *new_active, *old_active;
	struct slave *bestslave = NULL;
	int mintime = bond->params.updelay;
	int i;

942
	new_active = bond->curr_active_slave;
Linus Torvalds's avatar
Linus Torvalds committed
943
944

	if (!new_active) { /* there were no active slaves left */
Stephen Hemminger's avatar
Stephen Hemminger committed
945
		if (bond->slave_cnt > 0)   /* found one slave */
Linus Torvalds's avatar
Linus Torvalds committed
946
			new_active = bond->first_slave;
Stephen Hemminger's avatar
Stephen Hemminger committed
947
		else
Linus Torvalds's avatar
Linus Torvalds committed
948
949
950
951
			return NULL; /* still no slave, return NULL */
	}

	if ((bond->primary_slave) &&
952
953
	    bond->primary_slave->link == BOND_LINK_UP &&
	    bond_should_change_active(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
954
955
956
957
958
959
960
		new_active = bond->primary_slave;
	}

	/* remember where to stop iterating over the slaves */
	old_active = new_active;

	bond_for_each_slave_from(bond, new_active, i, old_active) {
961
962
963
964
965
966
967
968
		if (new_active->link == BOND_LINK_UP) {
			return new_active;
		} else if (new_active->link == BOND_LINK_BACK &&
			   IS_UP(new_active->dev)) {
			/* link up, but waiting for stabilization */
			if (new_active->delay < mintime) {
				mintime = new_active->delay;
				bestslave = new_active;
Linus Torvalds's avatar
Linus Torvalds committed
969
970
971
972
973
974
975
			}
		}
	}

	return bestslave;
}

976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
static bool bond_should_notify_peers(struct bonding *bond)
{
	struct slave *slave = bond->curr_active_slave;

	pr_debug("bond_should_notify_peers: bond %s slave %s\n",
		 bond->dev->name, slave ? slave->dev->name : "NULL");

	if (!slave || !bond->send_peer_notif ||
	    test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
		return false;

	bond->send_peer_notif--;
	return true;
}

Linus Torvalds's avatar
Linus Torvalds committed
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
/**
 * change_active_interface - change the active slave into the specified one
 * @bond: our bonding struct
 * @new: the new slave to make the active one
 *
 * Set the new slave to the bond's settings and unset them on the old
 * curr_active_slave.
 * Setting include flags, mc-list, promiscuity, allmulti, etc.
 *
 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 * because it is apparently the best available slave we have, even though its
 * updelay hasn't timed out yet.
 *
1004
1005
 * If new_active is not NULL, caller must hold bond->lock for read and
 * curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1006
 */
1007
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1008
1009
1010
{
	struct slave *old_active = bond->curr_active_slave;

Stephen Hemminger's avatar
Stephen Hemminger committed
1011
	if (old_active == new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1012
1013
1014
		return;

	if (new_active) {
1015
1016
		new_active->jiffies = jiffies;

Linus Torvalds's avatar
Linus Torvalds committed
1017
1018
		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
1019
1020
1021
				pr_info("%s: making interface %s the new active one %d ms earlier.\n",
					bond->dev->name, new_active->dev->name,
					(bond->params.updelay - new_active->delay) * bond->params.miimon);
Linus Torvalds's avatar
Linus Torvalds committed
1022
1023
1024
1025
1026
			}

			new_active->delay = 0;
			new_active->link = BOND_LINK_UP;

Stephen Hemminger's avatar
Stephen Hemminger committed
1027
			if (bond->params.mode == BOND_MODE_8023AD)
Linus Torvalds's avatar
Linus Torvalds committed
1028
1029
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);

1030
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
1031
1032
1033
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
1034
1035
				pr_info("%s: making interface %s the new active one.\n",
					bond->dev->name, new_active->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1036
1037
1038
1039
			}
		}
	}

Stephen Hemminger's avatar
Stephen Hemminger committed
1040
	if (USES_PRIMARY(bond->params.mode))
1041
		bond_hw_addr_swap(bond, new_active, old_active);
Linus Torvalds's avatar
Linus Torvalds committed
1042

1043
	if (bond_is_lb(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1044
		bond_alb_handle_active_change(bond, new_active);
1045
1046
1047
1048
		if (old_active)
			bond_set_slave_inactive_flags(old_active);
		if (new_active)
			bond_set_slave_active_flags(new_active);
Linus Torvalds's avatar
Linus Torvalds committed
1049
1050
1051
	} else {
		bond->curr_active_slave = new_active;
	}
Jay Vosburgh's avatar
Jay Vosburgh committed
1052
1053

	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
Stephen Hemminger's avatar
Stephen Hemminger committed
1054
		if (old_active)
Jay Vosburgh's avatar
Jay Vosburgh committed
1055
1056
1057
			bond_set_slave_inactive_flags(old_active);

		if (new_active) {
1058
1059
			bool should_notify_peers = false;

Jay Vosburgh's avatar
Jay Vosburgh committed
1060
			bond_set_slave_active_flags(new_active);
1061

1062
1063
1064
			if (bond->params.fail_over_mac)
				bond_do_fail_over_mac(bond, new_active,
						      old_active);
1065

1066
1067
1068
1069
1070
1071
1072
			if (netif_running(bond->dev)) {
				bond->send_peer_notif =
					bond->params.num_peer_notif;
				should_notify_peers =
					bond_should_notify_peers(bond);
			}

1073
1074
1075
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);

1076
			call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1077
			if (should_notify_peers)
1078
1079
				call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
							 bond->dev);
1080
1081
1082

			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
1083
		}
Jay Vosburgh's avatar
Jay Vosburgh committed
1084
	}
1085

1086
	/* resend IGMP joins since active slave has changed or
1087
1088
1089
1090
1091
1092
	 * all were sent on curr_active_slave.
	 * resend only if bond is brought up with the affected
	 * bonding modes and the retransmission is enabled */
	if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
	    ((USES_PRIMARY(bond->params.mode) && new_active) ||
	     bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1093
		bond->igmp_retrans = bond->params.resend_igmp;
1094
		queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1095
	}
Linus Torvalds's avatar
Linus Torvalds committed
1096
1097
1098
1099
1100
1101
}

/**
 * bond_select_active_slave - select a new active slave, if needed
 * @bond: our bonding struct
 *
Stephen Hemminger's avatar
Stephen Hemminger committed
1102
 * This functions should be called when one of the following occurs:
Linus Torvalds's avatar
Linus Torvalds committed
1103
1104
1105
1106
 * - The old curr_active_slave has been released or lost its link.
 * - The primary_slave has got its link back.
 * - A slave has got its link back and there's no old curr_active_slave.
 *
1107
 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1108
 */
1109
void bond_select_active_slave(struct bonding *bond)
Linus Torvalds's avatar
Linus Torvalds committed
1110
1111
{
	struct slave *best_slave;
1112
	int rv;
Linus Torvalds's avatar
Linus Torvalds committed
1113
1114
1115
1116

	best_slave = bond_find_best_slave(bond);
	if (best_slave != bond->curr_active_slave) {
		bond_change_active_slave(bond, best_slave);
1117
1118
1119
1120
1121
		rv = bond_set_carrier(bond);
		if (!rv)
			return;

		if (netif_carrier_ok(bond->dev)) {
1122
1123
			pr_info("%s: first active interface up!\n",
				bond->dev->name);
1124
		} else {
1125
1126
			pr_info("%s: now running without any active interface !\n",
				bond->dev->name);
1127
		}
Linus Torvalds's avatar
Linus Torvalds committed
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
	}
}

/*--------------------------- slave list handling ---------------------------*/

/*
 * This function attaches the slave to the end of list.
 *
 * bond->lock held for writing by caller.
 */
static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
{
	if (bond->first_slave == NULL) { /* attaching the first slave */
		new_slave->next = new_slave;
		new_slave->prev = new_slave;
		bond->first_slave = new_slave;
	} else {
		new_slave->next = bond->first_slave;
		new_slave->prev = bond->first_slave->prev;
		new_slave->next->prev = new_slave;
		new_slave->prev->next = new_slave;
	}

	bond->slave_cnt++;
}

/*
 * This function detaches the slave from the list.
 * WARNING: no check is made to verify if the slave effectively
 * belongs to <bond>.
 * Nothing is freed on return, structures are just unchained.
 * If any slave pointer in bond was pointing to <slave>,
 * it should be changed by the calling function.
 *
 * bond->lock held for writing by caller.
 */
static void bond_detach_slave(struct bonding *bond, struct slave *slave)
{
Stephen Hemminger's avatar
Stephen Hemminger committed
1166
	if (slave->next)
Linus Torvalds's avatar
Linus Torvalds committed
1167
1168
		slave->next->prev = slave->prev;

Stephen Hemminger's avatar
Stephen Hemminger committed
1169
	if (slave->prev)
Linus Torvalds's avatar
Linus Torvalds committed
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
		slave->prev->next = slave->next;

	if (bond->first_slave == slave) { /* slave is the first slave */
		if (bond->slave_cnt > 1) { /* there are more slave */
			bond->first_slave = slave->next;
		} else {
			bond->first_slave = NULL; /* slave was the last one */
		}
	}

	slave->next = NULL;
	slave->prev = NULL;
	bond->slave_cnt--;
}

1185
#ifdef CONFIG_NET_POLL_CONTROLLER
1186
static inline int slave_enable_netpoll(struct slave *slave)
1187
{
1188
1189
	struct netpoll *np;
	int err = 0;
1190

1191
	np = kzalloc(sizeof(*np), GFP_ATOMIC);