bond_main.c 134 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
34
35
36
37
38
39
40
41
42
43
/*
 * 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.
 *
 */

//#define BONDING_DEBUG 1

#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
56
57
58
59
60
61
62
#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>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
63
#include <linux/igmp.h>
Linus Torvalds's avatar
Linus Torvalds committed
64
65
66
67
68
69
70
71
72
73
74
75
76
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.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
77
#include <linux/jiffies.h>
Jay Vosburgh's avatar
Jay Vosburgh committed
78
#include <net/route.h>
79
#include <net/net_namespace.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 num_grat_arp = 1;
92
static int num_unsol_na = 1;
Linus Torvalds's avatar
Linus Torvalds committed
93
94
95
96
97
98
99
static int miimon	= BOND_LINK_MON_INTERV;
static int updelay	= 0;
static int downdelay	= 0;
static int use_carrier	= 1;
static char *mode	= NULL;
static char *primary	= NULL;
static char *lacp_rate	= NULL;
100
static char *xmit_hash_policy = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
101
102
static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
103
static char *arp_validate = NULL;
104
static char *fail_over_mac = NULL;
105
struct bond_params bonding_defaults;
Linus Torvalds's avatar
Linus Torvalds committed
106
107
108

module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
109
110
module_param(num_grat_arp, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
111
112
module_param(num_unsol_na, int, 0644);
MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
Linus Torvalds's avatar
Linus Torvalds committed
113
114
115
116
117
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);
118
119
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
			    "in milliseconds");
Linus Torvalds's avatar
Linus Torvalds committed
120
module_param(use_carrier, int, 0);
121
122
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
123
module_param(mode, charp, 0);
124
125
126
127
MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
		       "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
128
129
130
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
module_param(lacp_rate, charp, 0);
131
132
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
			    "(slow/fast)");
133
module_param(xmit_hash_policy, charp, 0);
134
135
MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
				   ", 1 for layer 3+4");
Linus Torvalds's avatar
Linus Torvalds committed
136
137
138
139
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");
140
141
module_param(arp_validate, charp, 0);
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
142
143
module_param(fail_over_mac, charp, 0);
MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
Linus Torvalds's avatar
Linus Torvalds committed
144
145
146

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

147
static const char * const version =
Linus Torvalds's avatar
Linus Torvalds committed
148
149
	DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";

150
LIST_HEAD(bond_dev_list);
Linus Torvalds's avatar
Linus Torvalds committed
151
152
153
154
155

#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *bond_proc_dir = NULL;
#endif

156
extern struct rw_semaphore bonding_rwsem;
157
static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
Linus Torvalds's avatar
Linus Torvalds committed
158
159
static int arp_ip_count	= 0;
static int bond_mode	= BOND_MODE_ROUNDROBIN;
160
static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
Linus Torvalds's avatar
Linus Torvalds committed
161
static int lacp_fast	= 0;
162

Linus Torvalds's avatar
Linus Torvalds committed
163

164
struct bond_parm_tbl bond_lacp_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
165
166
167
168
169
{	"slow",		AD_LACP_SLOW},
{	"fast",		AD_LACP_FAST},
{	NULL,		-1},
};

170
struct bond_parm_tbl bond_mode_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
171
172
173
174
175
176
177
178
179
180
{	"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},
};

181
struct bond_parm_tbl xmit_hashtype_tbl[] = {
182
183
{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
184
{	"layer2+3",		BOND_XMIT_POLICY_LAYER23},
185
186
187
{	NULL,			-1},
};

188
189
190
191
192
193
194
195
struct bond_parm_tbl arp_validate_tbl[] = {
{	"none",			BOND_ARP_VALIDATE_NONE},
{	"active",		BOND_ARP_VALIDATE_ACTIVE},
{	"backup",		BOND_ARP_VALIDATE_BACKUP},
{	"all",			BOND_ARP_VALIDATE_ALL},
{	NULL,			-1},
};

196
197
198
199
200
201
202
struct bond_parm_tbl fail_over_mac_tbl[] = {
{	"none",			BOND_FOM_NONE},
{	"active",		BOND_FOM_ACTIVE},
{	"follow",		BOND_FOM_FOLLOW},
{	NULL,			-1},
};

Linus Torvalds's avatar
Linus Torvalds committed
203
204
/*-------------------------- Forward declarations ---------------------------*/

Jay Vosburgh's avatar
Jay Vosburgh committed
205
static void bond_send_gratuitous_arp(struct bonding *bond);
206
static void bond_deinit(struct net_device *bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
207
208
209

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

210
static const char *bond_mode_name(int mode)
Linus Torvalds's avatar
Linus Torvalds committed
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
{
	switch (mode) {
	case BOND_MODE_ROUNDROBIN :
		return "load balancing (round-robin)";
	case BOND_MODE_ACTIVEBACKUP :
		return "fault-tolerance (active-backup)";
	case BOND_MODE_XOR :
		return "load balancing (xor)";
	case BOND_MODE_BROADCAST :
		return "fault-tolerance (broadcast)";
	case BOND_MODE_8023AD:
		return "IEEE 802.3ad Dynamic link aggregation";
	case BOND_MODE_TLB:
		return "transmit load balancing";
	case BOND_MODE_ALB:
		return "adaptive load balancing";
	default:
		return "unknown";
	}
}

/*---------------------------------- 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;

	dprintk("bond: %s, vlan id %d\n",
		(bond ? bond->dev->name: "None"), vlan_id);

248
	vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
	if (!vlan) {
		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);

	dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);

	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)
{
276
	struct vlan_entry *vlan;
Linus Torvalds's avatar
Linus Torvalds committed
277
278
279
280
281
282
	int res = -ENODEV;

	dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);

	write_lock_bh(&bond->lock);

283
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
Linus Torvalds's avatar
Linus Torvalds committed
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
		if (vlan->vlan_id == vlan_id) {
			list_del(&vlan->vlan_list);

			if ((bond->params.mode == BOND_MODE_TLB) ||
			    (bond->params.mode == BOND_MODE_ALB)) {
				bond_alb_clear_vlan(bond, vlan_id);
			}

			dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
				bond->dev->name);

			kfree(vlan);

			if (list_empty(&bond->vlan_list) &&
			    (bond->slave_cnt == 0)) {
				/* Last VLAN removed and no slaves, so
				 * restore block on adding VLANs. This will
				 * be removed once new slaves that are not
				 * VLAN challenged will be added.
				 */
				bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
			}

			res = 0;
			goto out;
		}
	}

	dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
		bond->dev->name);

out:
	write_unlock_bh(&bond->lock);
	return res;
}

/**
 * bond_has_challenged_slaves
 * @bond: the bond we're working on
 *
 * Searches the slave list. Returns 1 if a vlan challenged slave
 * was found, 0 otherwise.
 *
 * Assumes bond->lock is held.
 */
static int bond_has_challenged_slaves(struct bonding *bond)
{
	struct slave *slave;
	int i;

	bond_for_each_slave(bond, slave, i) {
		if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
			dprintk("found VLAN challenged slave - %s\n",
				slave->dev->name);
			return 1;
		}
	}

	dprintk("no VLAN challenged slaves found\n");
	return 0;
}

/**
 * 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).
 * 
 * Caller must hold bond->lock
 */
struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
{
	struct vlan_entry *next, *last;

	if (list_empty(&bond->vlan_list)) {
		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.
 * 
 * @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
 * 
 * When the bond gets an skb to transmit that is
 * already hardware accelerated VLAN tagged, and it
 * needs to relay this skb to a slave that is not
 * hw accel capable, the skb needs to be "unaccelerated",
 * i.e. strip the hwaccel tag and re-insert it as part
 * of the payload.
 */
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
{
398
	unsigned short uninitialized_var(vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485

	if (!list_empty(&bond->vlan_list) &&
	    !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
	    vlan_get_tag(skb, &vlan_id) == 0) {
		skb->dev = slave_dev;
		skb = vlan_put_tag(skb, vlan_id);
		if (!skb) {
			/* vlan_put_tag() frees the skb in case of error,
			 * so return success here so the calling functions
			 * won't attempt to free is again.
			 */
			return 0;
		}
	} else {
		skb->dev = slave_dev;
	}

	skb->priority = 1;
	dev_queue_xmit(skb);

	return 0;
}

/*
 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 * lock because:
 * 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.
 * 
 * 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_register - Propagates registration to slaves
 * @bond_dev: bonding net device that got called
 * @grp: vlan group being registered
 */
static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
{
	struct bonding *bond = bond_dev->priv;
	struct slave *slave;
	int i;

	bond->vlgrp = grp;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;

		if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
		    slave_dev->vlan_rx_register) {
			slave_dev->vlan_rx_register(slave_dev, grp);
		}
	}
}

/**
 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 * @bond_dev: bonding net device that got called
 * @vid: vlan id being added
 */
static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
{
	struct bonding *bond = bond_dev->priv;
	struct slave *slave;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
		    slave_dev->vlan_rx_add_vid) {
			slave_dev->vlan_rx_add_vid(slave_dev, vid);
		}
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
		printk(KERN_ERR DRV_NAME
486
		       ": %s: Error: Failed to add vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
		       bond_dev->name, vid);
	}
}

/**
 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 * @bond_dev: bonding net device that got called
 * @vid: vlan id being removed
 */
static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
{
	struct bonding *bond = bond_dev->priv;
	struct slave *slave;
	struct net_device *vlan_dev;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
		    slave_dev->vlan_rx_kill_vid) {
			/* Save and then restore vlan_dev in the grp array,
			 * since the slave's driver might clear it.
			 */
511
			vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
Linus Torvalds's avatar
Linus Torvalds committed
512
			slave_dev->vlan_rx_kill_vid(slave_dev, vid);
513
			vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
514
515
516
517
518
519
		}
	}

	res = bond_del_vlan(bond, vid);
	if (res) {
		printk(KERN_ERR DRV_NAME
520
		       ": %s: Error: Failed to remove vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
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
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
		       bond_dev->name, vid);
	}
}

static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;

	write_lock_bh(&bond->lock);

	if (list_empty(&bond->vlan_list)) {
		goto out;
	}

	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
	    slave_dev->vlan_rx_register) {
		slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
	}

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
	    !(slave_dev->vlan_rx_add_vid)) {
		goto out;
	}

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
	}

out:
	write_unlock_bh(&bond->lock);
}

static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

	write_lock_bh(&bond->lock);

	if (list_empty(&bond->vlan_list)) {
		goto out;
	}

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
	    !(slave_dev->vlan_rx_kill_vid)) {
		goto unreg;
	}

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		/* Save and then restore vlan_dev in the grp array,
		 * since the slave's driver might clear it.
		 */
573
		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
574
		slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
575
		vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
576
577
578
579
580
581
582
583
584
585
586
587
588
589
	}

unreg:
	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
	    slave_dev->vlan_rx_register) {
		slave_dev->vlan_rx_register(slave_dev, NULL);
	}

out:
	write_unlock_bh(&bond->lock);
}

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

590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
/*
 * 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
626
627
628
629
630
631
632
633
634
635
/*
 * Get link speed and duplex from the slave's base driver
 * using ethtool. If for some reason the call fails or the
 * values are invalid, fake speed and duplex to 100/Full
 * and return error.
 */
static int bond_update_speed_duplex(struct slave *slave)
{
	struct net_device *slave_dev = slave->dev;
	struct ethtool_cmd etool;
636
	int res;
Linus Torvalds's avatar
Linus Torvalds committed
637
638
639
640
641

	/* Fake speed and duplex */
	slave->speed = SPEED_100;
	slave->duplex = DUPLEX_FULL;

642
643
	if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
		return -1;
Linus Torvalds's avatar
Linus Torvalds committed
644

645
646
	res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
	if (res < 0)
Linus Torvalds's avatar
Linus Torvalds committed
647
648
649
650
651
652
		return -1;

	switch (etool.speed) {
	case SPEED_10:
	case SPEED_100:
	case SPEED_1000:
653
	case SPEED_10000:
Linus Torvalds's avatar
Linus Torvalds committed
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
		break;
	default:
		return -1;
	}

	switch (etool.duplex) {
	case DUPLEX_FULL:
	case DUPLEX_HALF:
		break;
	default:
		return -1;
	}

	slave->speed = etool.speed;
	slave->duplex = etool.duplex;

	return 0;
}

/*
 * if <dev> supports MII link status reporting, check its link status.
 *
 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 * depening upon the setting of the use_carrier parameter.
 *
 * 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.
 */
static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
{
	static int (* ioctl)(struct net_device *, struct ifreq *, int);
	struct ifreq ifr;
	struct mii_ioctl_data *mii;

	if (bond->params.use_carrier) {
		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
	}

	ioctl = slave_dev->do_ioctl;
	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;
			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
				return (mii->val_out & BMSR_LSTATUS);
			}
		}
	}

724
725
726
727
	/*
	 * Some drivers cache ETHTOOL_GLINK for a period of time so we only
	 * attempt to get link status from it if the above MII ioctls fail.
	 */
Linus Torvalds's avatar
Linus Torvalds committed
728
729
730
731
732
733
734
735
736
737
738
739
	if (slave_dev->ethtool_ops) {
		if (slave_dev->ethtool_ops->get_link) {
			u32 link;

			link = slave_dev->ethtool_ops->get_link(slave_dev);

			return link ? BMSR_LSTATUS : 0;
		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
740
	 * or both SIOCGMIIREG and get_link failed (meaning that we
Linus Torvalds's avatar
Linus Torvalds committed
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
	return (reporting ? -1 : BMSR_LSTATUS);
}

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

/*
 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 */
static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
{
	return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
			dmi1->dmi_addrlen == dmi2->dmi_addrlen;
}

/*
 * returns dmi entry if found, NULL otherwise
 */
static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
{
	struct dev_mc_list *idmi;

	for (idmi = mc_list; idmi; idmi = idmi->next) {
		if (bond_is_dmi_same(dmi, idmi)) {
			return idmi;
		}
	}

	return NULL;
}

/*
 * Push the promiscuity flag down to appropriate slaves
 */
777
static int bond_set_promiscuity(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
778
{
779
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
780
781
782
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
783
784
			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
Linus Torvalds's avatar
Linus Torvalds committed
785
786
787
788
789
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
790
791
792
			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
793
794
		}
	}
795
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
796
797
798
799
800
}

/*
 * Push the allmulti flag down to all slaves
 */
801
static int bond_set_allmulti(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
802
{
803
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
804
805
806
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
807
808
			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
Linus Torvalds's avatar
Linus Torvalds committed
809
810
811
812
813
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
814
815
816
			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
817
818
		}
	}
819
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
}

/*
 * Add a Multicast address to slaves
 * according to mode
 */
static void bond_mc_add(struct bonding *bond, void *addr, int alen)
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
			dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
			dev_mc_add(slave->dev, addr, alen, 0);
		}
	}
}

/*
 * Remove a multicast address from slave
 * according to mode
 */
static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
			dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
			dev_mc_delete(slave->dev, addr, alen, 0);
		}
	}
}

862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883

/*
 * 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)
{
	struct in_device *in_dev;
	struct ip_mc_list *im;

	rcu_read_lock();
	in_dev = __in_dev_get_rcu(bond->dev);
	if (in_dev) {
		for (im = in_dev->mc_list; im; im = im->next) {
			ip_mc_rejoin_group(im);
		}
	}

	rcu_read_unlock();
}

Linus Torvalds's avatar
Linus Torvalds committed
884
885
886
887
888
889
890
891
892
893
894
895
896
/*
 * Totally destroys the mc_list in bond
 */
static void bond_mc_list_destroy(struct bonding *bond)
{
	struct dev_mc_list *dmi;

	dmi = bond->mc_list;
	while (dmi) {
		bond->mc_list = dmi->next;
		kfree(dmi);
		dmi = bond->mc_list;
	}
897
        bond->mc_list = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
898
899
900
901
902
}

/*
 * Copy all the Multicast addresses from src to the bonding device dst
 */
903
static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
904
			     gfp_t gfp_flag)
Linus Torvalds's avatar
Linus Torvalds committed
905
906
907
908
{
	struct dev_mc_list *dmi, *new_dmi;

	for (dmi = mc_list; dmi; dmi = dmi->next) {
909
		new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
Linus Torvalds's avatar
Linus Torvalds committed
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979

		if (!new_dmi) {
			/* FIXME: Potential memory leak !!! */
			return -ENOMEM;
		}

		new_dmi->next = bond->mc_list;
		bond->mc_list = new_dmi;
		new_dmi->dmi_addrlen = dmi->dmi_addrlen;
		memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
		new_dmi->dmi_users = dmi->dmi_users;
		new_dmi->dmi_gusers = dmi->dmi_gusers;
	}

	return 0;
}

/*
 * flush all members of flush->mc_list from device dev->mc_list
 */
static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
{
	struct bonding *bond = bond_dev->priv;
	struct dev_mc_list *dmi;

	for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
		dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
	}

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

		dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
	}
}

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

/*
 * Update the mc list and multicast-related flags for the new and
 * old active slaves (if any) according to the multicast mode, and
 * promiscuous flags unconditionally.
 */
static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
{
	struct dev_mc_list *dmi;

	if (!USES_PRIMARY(bond->params.mode)) {
		/* nothing to do -  mc list is already up-to-date on
		 * all slaves
		 */
		return;
	}

	if (old_active) {
		if (bond->dev->flags & IFF_PROMISC) {
			dev_set_promiscuity(old_active->dev, -1);
		}

		if (bond->dev->flags & IFF_ALLMULTI) {
			dev_set_allmulti(old_active->dev, -1);
		}

		for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
			dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
		}
	}

	if (new_active) {
980
		/* FIXME: Signal errors upstream. */
Linus Torvalds's avatar
Linus Torvalds committed
981
982
983
984
985
986
987
988
989
990
991
		if (bond->dev->flags & IFF_PROMISC) {
			dev_set_promiscuity(new_active->dev, 1);
		}

		if (bond->dev->flags & IFF_ALLMULTI) {
			dev_set_allmulti(new_active->dev, 1);
		}

		for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
			dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
		}
992
		bond_resend_igmp_join_requests(bond);
Linus Torvalds's avatar
Linus Torvalds committed
993
994
995
	}
}

996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
/*
 * 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)
{
	u8 tmp_mac[ETH_ALEN];
	struct sockaddr saddr;
	int rv;

	switch (bond->params.fail_over_mac) {
	case BOND_FOM_ACTIVE:
		if (new_active)
			memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
			       new_active->dev->addr_len);
		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) {
			printk(KERN_ERR DRV_NAME
			       ": %s: Error %d setting MAC of slave %s\n",
			       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)
			printk(KERN_ERR DRV_NAME
			       ": %s: Error %d setting MAC of slave %s\n",
			       bond->dev->name, -rv, new_active->dev->name);
out:
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);
		break;
	default:
		printk(KERN_ERR DRV_NAME
		       ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
		       bond->dev->name, bond->params.fail_over_mac);
		break;
	}

}


Linus Torvalds's avatar
Linus Torvalds committed
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
/**
 * 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;

	new_active = old_active = bond->curr_active_slave;

	if (!new_active) { /* there were no active slaves left */
		if (bond->slave_cnt > 0) {  /* found one slave */
			new_active = bond->first_slave;
		} else {
			return NULL; /* still no slave, return NULL */
		}
	}

	/* first try the primary link; if arping, a link must tx/rx traffic
	 * before it can be considered the curr_active_slave - also, we would skip
	 * slaves between the curr_active_slave and primary_slave that may be up
	 * and able to arp
	 */
	if ((bond->primary_slave) &&
	    (!bond->params.arp_interval) &&
	    (IS_UP(bond->primary_slave->dev))) {
		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) {
		if (IS_UP(new_active->dev)) {
			if (new_active->link == BOND_LINK_UP) {
				return new_active;
			} else if (new_active->link == BOND_LINK_BACK) {
				/* link up, but waiting for stabilization */
				if (new_active->delay < mintime) {
					mintime = new_active->delay;
					bestslave = new_active;
				}
			}
		}
	}

	return bestslave;
}

/**
 * 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.
 *
1139
1140
 * 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
1141
 */
1142
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1143
1144
1145
1146
1147
1148
1149
1150
{
	struct slave *old_active = bond->curr_active_slave;

	if (old_active == new_active) {
		return;
	}

	if (new_active) {
1151
1152
		new_active->jiffies = jiffies;

Linus Torvalds's avatar
Linus Torvalds committed
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
				printk(KERN_INFO DRV_NAME
				       ": %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);
			}

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

			if (bond->params.mode == BOND_MODE_8023AD) {
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
			}

			if ((bond->params.mode == BOND_MODE_TLB) ||
			    (bond->params.mode == BOND_MODE_ALB)) {
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
			}
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
				printk(KERN_INFO DRV_NAME
				       ": %s: making interface %s the new "
				       "active one.\n",
				       bond->dev->name, new_active->dev->name);
			}
		}
	}

	if (USES_PRIMARY(bond->params.mode)) {
		bond_mc_swap(bond, new_active, old_active);
	}

	if ((bond->params.mode == BOND_MODE_TLB) ||
	    (bond->params.mode == BOND_MODE_ALB)) {
		bond_alb_handle_active_change(bond, new_active);
1190
1191
1192
1193
		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
1194
1195
1196
	} else {
		bond->curr_active_slave = new_active;
	}
Jay Vosburgh's avatar
Jay Vosburgh committed
1197
1198
1199
1200
1201
1202
1203
1204

	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
		if (old_active) {
			bond_set_slave_inactive_flags(old_active);
		}

		if (new_active) {
			bond_set_slave_active_flags(new_active);
1205

1206
1207
1208
			if (bond->params.fail_over_mac)
				bond_do_fail_over_mac(bond, new_active,
						      old_active);
1209

1210
			bond->send_grat_arp = bond->params.num_grat_arp;
1211
			bond_send_gratuitous_arp(bond);
1212

1213
1214
1215
			bond->send_unsol_na = bond->params.num_unsol_na;
			bond_send_unsolicited_na(bond);

1216
1217
1218
1219
1220
1221
1222
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);

			netdev_bonding_change(bond->dev);

			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
1223
		}
Jay Vosburgh's avatar
Jay Vosburgh committed
1224
	}
Linus Torvalds's avatar
Linus Torvalds committed
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
}

/**
 * bond_select_active_slave - select a new active slave, if needed
 * @bond: our bonding struct
 *
 * This functions shoud be called when one of the following occurs:
 * - 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.
 *
1236
 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1237
 */
1238
void bond_select_active_slave(struct bonding *bond)
Linus Torvalds's avatar
Linus Torvalds committed
1239
1240
{
	struct slave *best_slave;
1241
	int rv;
Linus Torvalds's avatar
Linus Torvalds committed
1242
1243
1244
1245

	best_slave = bond_find_best_slave(bond);
	if (best_slave != bond->curr_active_slave) {
		bond_change_active_slave(bond, best_slave);
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
		rv = bond_set_carrier(bond);
		if (!rv)
			return;

		if (netif_carrier_ok(bond->dev)) {
			printk(KERN_INFO DRV_NAME
			       ": %s: first active interface up!\n",
			       bond->dev->name);
		} else {
			printk(KERN_INFO DRV_NAME ": %s: "
			       "now running without any active interface !\n",
			       bond->dev->name);
		}
Linus Torvalds's avatar
Linus Torvalds committed
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
	}
}

/*--------------------------- 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)
{
	if (slave->next) {
		slave->next->prev = slave->prev;
	}

	if (slave->prev) {
		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--;
}

/*---------------------------------- IOCTL ----------------------------------*/

1320
1321
static int bond_sethwaddr(struct net_device *bond_dev,
			  struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
1322
1323
1324
1325
1326
1327
1328
1329
{
	dprintk("bond_dev=%p\n", bond_dev);
	dprintk("slave_dev=%p\n", slave_dev);
	dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
	memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
	return 0;
}

1330
1331
1332
#define BOND_VLAN_FEATURES \
	(NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
	 NETIF_F_HW_VLAN_FILTER)
1333
1334

/* 
1335
 * Compute the common dev->feature set available to all slaves.  Some
1336
1337
 * feature bits are managed elsewhere, so preserve those feature bits
 * on the master device.
1338
1339
1340
1341
1342
 */
static int bond_compute_features(struct bonding *bond)
{
	struct slave *slave;
	struct net_device *bond_dev = bond->dev;
1343
	unsigned long features = bond_dev->features;
1344
1345
	unsigned short max_hard_header_len = max((u16)ETH_HLEN,
						bond_dev->hard_header_len);
1346
	int i;
1347

1348
	features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1349
1350
1351
1352
1353
1354
	features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;

	if (!bond->first_slave)
		goto done;

	features &= ~NETIF_F_ONE_FOR_ALL;
1355

1356
	bond_for_each_slave(bond, slave, i) {
1357
1358
1359
		features = netdev_increment_features(features,
						     slave->dev->features,
						     NETIF_F_ONE_FOR_ALL);
1360
1361
1362
		if (slave->dev->hard_header_len > max_hard_header_len)
			max_hard_header_len = slave->dev->hard_header_len;
	}
1363

1364
done:
1365
	features |= (bond_dev->features & BOND_VLAN_FEATURES);
1366
	bond_dev->features = netdev_fix_features(features, NULL);
1367
	bond_dev->hard_header_len = max_hard_header_len;
1368
1369
1370
1371

	return 0;
}

1372
1373
1374
1375

static void bond_setup_by_slave(struct net_device *bond_dev,
				struct net_device *slave_dev)
{
1376
1377
	struct bonding *bond = bond_dev->priv;

1378
	bond_dev->neigh_setup           = slave_dev->neigh_setup;
1379
	bond_dev->header_ops		= slave_dev->header_ops;
1380
1381
1382
1383
1384
1385
1386

	bond_dev->type		    = slave_dev->type;
	bond_dev->hard_header_len   = slave_dev->hard_header_len;
	bond_dev->addr_len	    = slave_dev->addr_len;

	memcpy(bond_dev->broadcast, slave_dev->broadcast,
		slave_dev->addr_len);
1387
	bond->setup_by_slave = 1;
1388
1389
}

Linus Torvalds's avatar
Linus Torvalds committed
1390
/* enslave device <slave> to bond device <master> */
1391
int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
1392
1393
1394
1395
1396
1397
1398
1399
1400
{
	struct bonding *bond = bond_dev->priv;
	struct slave *new_slave = NULL;
	struct dev_mc_list *dmi;
	struct sockaddr addr;
	int link_reporting;
	int old_features = bond_dev->features;
	int res = 0;

1401
1402
	if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
		slave_dev->do_ioctl == NULL) {
Linus Torvalds's avatar
Linus Torvalds committed
1403
		printk(KERN_WARNING DRV_NAME
1404
1405
		       ": %s: Warning: no link monitoring support for %s\n",
		       bond_dev->name, slave_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1406
1407
1408
1409
	}

	/* bond must be initialized by bond_open() before enslaving */
	if (!(bond_dev->flags & IFF_UP)) {
1410
1411
1412
		printk(KERN_WARNING DRV_NAME
			" %s: master_dev is not up in bond_enslave\n",
			bond_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
	}

	/* already enslaved */
	if (slave_dev->flags & IFF_SLAVE) {
		dprintk("Error, Device was already enslaved\n");
		return -EBUSY;
	}

	/* vlan challenged mutual exclusion */
	/* no need to lock since we're protected by rtnl_lock */
	if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
		dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
		if (!list_empty(&bond->vlan_list)) {
			printk(KERN_ERR DRV_NAME
1427
			       ": %s: Error: cannot enslave VLAN "
Linus Torvalds's avatar
Linus Torvalds committed
1428
			       "challenged slave %s on VLAN enabled "
1429
			       "bond %s\n", bond_dev->name, slave_dev->name,
Linus Torvalds's avatar
Linus Torvalds committed
1430
1431
1432
1433
			       bond_dev->name);
			return -EPERM;
		} else {
			printk(KERN_WARNING DRV_NAME
1434
			       ": %s: Warning: enslaved VLAN challenged "
Linus Torvalds's avatar
Linus Torvalds committed
1435
1436
			       "slave %s. Adding VLANs will be blocked as "
			       "long as %s is part of bond %s\n",
1437
			       bond_dev->name, slave_dev->name, slave_dev->name,
Linus Torvalds's avatar
Linus Torvalds committed
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
			       bond_dev->name);
			bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
		}
	} else {
		dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
		if (bond->slave_cnt == 0) {
			/* First slave, and it is not VLAN challenged,
			 * so remove the block of adding VLANs over the bond.
			 */
			bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
		}
	}

1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
	/*
	 * Old ifenslave binaries are no longer supported.  These can
	 * be identified with moderate accurary by the state of the slave:
	 * the current ifenslave will set the interface down prior to
	 * enslaving it; the old ifenslave will not.
	 */
	if ((slave_dev->flags & IFF_UP)) {
		printk(KERN_ERR DRV_NAME ": %s is up. "
		       "This may be due to an out of date ifenslave.\n",
		       slave_dev->name);
		res = -EPERM;
		goto err_undo_flags;
	}
Linus Torvalds's avatar
Linus Torvalds committed
1464

1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
	/* set bonding device ether type by slave - bonding netdevices are
	 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
	 * there is a need to override some of the type dependent attribs/funcs.
	 *
	 * bond ether type mutual exclusion - don't allow slaves of dissimilar
	 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
	 */
	if (bond->slave_cnt == 0) {
		if (slave_dev->type != ARPHRD_ETHER)
			bond_setup_by_slave(bond_dev, slave_dev);
	} else if (bond_dev->type != slave_dev->type) {
		printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
			"from other slaves (%d), can not enslave it.\n",
			slave_dev->name,
			slave_dev->type, bond_dev->type);
			res = -EINVAL;
			goto err_undo_flags;
	}

1484
	if (slave_dev->set_mac_address == NULL) {
1485
1486
		if (bond->slave_cnt == 0) {
			printk(KERN_WARNING DRV_NAME
1487
1488
			       ": %s: Warning: The first slave device "
			       "specified does not support setting the MAC "
1489
			       "address. Setting fail_over_mac to active.",
1490
			       bond_dev->name);
1491
1492
			bond->params.fail_over_mac = BOND_FOM_ACTIVE;
		} else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1493
			printk(KERN_ERR DRV_NAME
1494
1495
				": %s: Error: The slave device specified "
				"does not support setting the MAC address, "
1496
				"but fail_over_mac is not set to active.\n"
1497
1498
1499
1500
				, bond_dev->name);
			res = -EOPNOTSUPP;
			goto err_undo_flags;
		}
Linus Torvalds's avatar
Linus Torvalds committed
1501
1502
	}

1503
	new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
	if (!new_slave) {
		res = -ENOMEM;
		goto err_undo_flags;
	}

	/* save slave's original flags before calling
	 * netdev_set_master and dev_open
	 */
	new_slave->original_flags = slave_dev->flags;

1514
1515
1516
1517
1518
1519
	/*
	 * Save slave's original ("permanent") mac address for modes
	 * that need it, and for restoring it upon release, and then
	 * set it to the master's address
	 */
	memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
Linus Torvalds's avatar
Linus Torvalds committed
1520

1521
	if (!bond->params.fail_over_mac) {
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
		/*
		 * Set slave to master's mac address.  The application already
		 * set the master's mac address to that of the first slave
		 */
		memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
		addr.sa_family = slave_dev->type;
		res = dev_set_mac_address(slave_dev, &addr);
		if (res) {
			dprintk("Error %d calling set_mac_address\n", res);
			goto err_free;
		}
1533
	}
Linus Torvalds's avatar
Linus Torvalds committed
1534

1535
1536
1537
	res = netdev_set_master(slave_dev, bond_dev);
	if (res) {
		dprintk("Error %d calling netdev_set_master\n", res);
1538
		goto err_restore_mac;
1539
	}
1540
1541
1542
1543
	/* open the slave since the application closed it */
	res = dev_open(slave_dev);
	if (res) {
		dprintk("Openning slave %s failed\n", slave_dev->name);
1544
		goto err_unset_master;
Linus Torvalds's avatar
Linus Torvalds committed
1545
1546
1547
	}

	new_slave->dev = slave_dev;
1548
	slave_dev->priv_flags |= IFF_BONDING;
Linus Torvalds's avatar
Linus Torvalds committed
1549
1550
1551
1552
1553
1554
1555
1556

	if ((bond->params.mode == BOND_MODE_TLB) ||
	    (bond->params.mode == BOND_MODE_ALB)) {
		/* bond_alb_init_slave() must be called before all other stages since
		 * it might fail and we do not want to have to undo everything
		 */
		res = bond_alb_init_slave(bond, new_slave);
		if (res) {
1557
			goto err_close;
Linus Torvalds's avatar
Linus Torvalds committed
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
		}
	}

	/* If the mode USES_PRIMARY, then the new slave gets the
	 * master's promisc (and mc) settings only if it becomes the
	 * curr_active_slave, and that is taken care of later when calling
	 * bond_change_active()
	 */
	if (!USES_PRIMARY(bond->params.mode)) {
		/* set promiscuity level to new slave */
		if (bond_dev->flags & IFF_PROMISC) {
1569
1570
1571
			res = dev_set_promiscuity(slave_dev, 1);
			if (res)
				goto err_close;
Linus Torvalds's avatar
Linus Torvalds committed
1572
1573
1574
1575
		}

		/* set allmulti level to new slave */
		if (bond_dev->flags & IFF_ALLMULTI) {
1576
1577
1578
			res = dev_set_allmulti(slave_dev, 1);
			if (res)
				goto err_close;
Linus Torvalds's avatar
Linus Torvalds committed
1579
1580
		}

1581
		netif_addr_lock_bh(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
1582
1583
1584
1585
		/* upload master's mc_list to new slave */
		for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
			dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
		}
1586
		netif_addr_unlock_bh(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
	}

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

		dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
	}

	bond_add_vlans_on_slave(bond, slave_dev);

	write_lock_bh(&bond->lock);

	bond_attach_slave(bond, new_slave);

	new_slave->delay = 0;
	new_slave->link_failure_count = 0;

1605
1606
	bond_compute_features(bond);

1607
1608
1609
1610
	write_unlock_bh(&bond->lock);

	read_lock(&bond->lock);

1611
1612
	new_slave->last_arp_rx = jiffies;

Linus Torvalds's avatar
Linus Torvalds committed
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
	if (bond->params.miimon && !bond->params.use_carrier) {
		link_reporting = bond_check_dev_link(bond, slave_dev, 1);

		if ((link_reporting == -1) && !bond->params.arp_interval) {
			/*
			 * miimon is set but a bonded network driver
			 * does not support ETHTOOL/MII and
			 * arp_interval is not set.  Note: if
			 * use_carrier is enabled, we will never go
			 * here (because netif_carrier is always
			 * supported); thus, we don't need to change
			 * the messages for netif_carrier.
			 */
			printk(KERN_WARNING DRV_NAME
1627
			       ": %s: Warning: MII and ETHTOOL support not "
Linus Torvalds's avatar
Linus Torvalds committed
1628
1629
1630
1631
			       "available for interface %s, and "
			       "arp_interval/arp_ip_target module parameters "
			       "not specified, thus bonding will not detect "
			       "link failures! see bonding.txt for details.\n",
1632
			       bond_dev->name, slave_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1633
1634
1635
		} else if (link_reporting == -1) {
			/* unable get link status using mii/ethtool */
			printk(KERN_WARNING DRV_NAME
1636
			       ": %s: Warning: can't get link status from "
Linus Torvalds's avatar
Linus Torvalds committed
1637
1638
1639
1640
			       "interface %s; the network driver associated "
			       "with this interface does not support MII or "
			       "ETHTOOL link status reporting, thus miimon "
			       "has no effect on this interface.\n",
1641
			       bond_dev->name, slave_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
		}
	}

	/* check for initial state */
	if (!bond->params.miimon ||
	    (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
		if (bond->params.updelay) {
			dprintk("Initial state of slave_dev is "
				"BOND_LINK_BACK\n");
			new_slave->link  = BOND_LINK_BACK;
			new_slave->delay = bond->params.updelay;
		} else {
			dprintk("Initial state of slave_dev is "
				"BOND_LINK_UP\n");
			new_slave->link  = BOND_LINK_UP;
		}
		new_slave->jiffies = jiffies;
	} else {
		dprintk("Initial state of slave_dev is "
			"BOND_LINK_DOWN\n");
		new_slave->link  = BOND_LINK_DOWN;
	}

	if (bond_update_speed_duplex(new_slave) &&
	    (new_slave->link != BOND_LINK_DOWN)) {
		printk(KERN_WARNING DRV_NAME
1668
		       ": %s: Warning: failed to get speed and duplex from %s, "
Linus Torvalds's avatar
Linus Torvalds committed
1669
		       "assumed to be 100Mb/sec and Full.\n",
1670
		       bond_dev->name, new_slave->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1671
1672

		if (bond->params.mode == BOND_MODE_8023AD) {
1673
1674
			printk(KERN_WARNING DRV_NAME
			       ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
Linus Torvalds's avatar
Linus Torvalds committed
1675
			       "support in base driver for proper aggregator "
1676
			       "selection.\n", bond_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
		}
	}

	if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
		/* if there is a primary slave, remember it */
		if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
			bond->primary_slave = new_slave;
		}
	}

1687
1688
	write_lock_bh(&bond->curr_slave_lock);

Linus Torvalds's avatar
Linus Torvalds committed
1689
1690
	switch (bond->params.mode) {
	case BOND_MODE_ACTIVEBACKUP:
1691
1692
		bond_set_slave_inactive_flags(new_slave);
		bond_select_active_slave(bond);
Linus Torvalds's avatar
Linus Torvalds committed
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
		break;
	case BOND_MODE_8023AD:
		/* in 802.3ad mode, the internal mechanism
		 * will activate the slaves in the selected
		 * aggregator
		 */
		bond_set_slave_inactive_flags(new_slave);
		/* if this is the first slave */
		if (bond->slave_cnt == 1) {
			SLAVE_AD_INFO(new_slave).id = 1;
			/* Initialize AD with the number of times that the AD timer is called in 1 second
			 * can be called only after the mac address of the bond is set
			 */
			bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
					    bond->params.lacp_fast);
		} else {
			SLAVE_AD_INFO(new_slave).id =
				SLAVE_AD_INFO(new_slave->prev).id + 1;
		}

		bond_3ad_bind_slave(new_slave);
		break;
	case BOND_MODE_TLB:
	case BOND_MODE_ALB:
		new_slave->state = BOND_STATE_ACTIVE;
1718
		bond_set_slave_inactive_flags(new_slave);
Linus Torvalds's avatar
Linus Torvalds committed
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
		break;
	default:
		dprintk("This slave is always active in trunk mode\n");

		/* always active in trunk mode */
		new_slave->state = BOND_STATE_ACTIVE;

		/* In trunking mode there is little meaning to curr_active_slave
		 * anyway (it holds no special properties of the bond device),
		 * so we can change it without calling change_active_interface()
		 */
		if (!bond->curr_active_slave) {
			bond->curr_active_slave = new_slave;
		}
		break;
	} /* switch(bond_mode) */

1736
1737
	write_unlock_bh(&bond->curr_slave_lock);

1738
1739
	bond_set_carrier(bond);

1740
	read_unlock(&bond->lock);
Linus Torvalds's avatar
Linus Torvalds committed
1741

1742
1743
	res = bond_create_slave_symlinks(bond_dev, slave_dev);
	if (res)
1744
		goto err_close;
1745

Linus Torvalds's avatar
Linus Torvalds committed
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
	printk(KERN_INFO DRV_NAME
	       ": %s: enslaving %s as a%s interface with a%s link.\n",
	       bond_dev->name, slave_dev->name,
	       new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
	       new_slave->link != BOND_LINK_DOWN ? "n up" : " down");

	/* enslave is successful */
	return 0;

/* Undo stages on error */
err_close:
	dev_close(slave_dev);

1759
1760
1761
err_unset_master:
	netdev_set_master(slave_dev, NULL);

Linus Torvalds's avatar
Linus Torvalds committed
1762
err_restore_mac:
1763
	if (!bond->params.fail_over_mac) {
1764
1765
1766
1767
		/* XXX TODO - fom follow mode needs to change master's
		 * MAC if this slave's MAC is in use by the bond, or at
		 * least print a warning.
		 */
1768
1769
1770
1771
		memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
		addr.sa_family = slave_dev->type;
		dev_set_mac_address(slave_dev, &addr);
	}
Linus Torvalds's avatar
Linus Torvalds committed
1772
1773
1774
1775
1776
1777

err_free:
	kfree(new_slave);

err_undo_flags:
	bond_dev->features = old_features;
1778
 
Linus Torvalds's avatar
Linus Torvalds committed
1779
1780
1781
1782
1783
1784
1785
1786
178