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
58
#include <asm/system.h>
#include <asm/dma.h>
Stephen Hemminger's avatar
Stephen Hemminger committed
59
#include <linux/uaccess.h>
Linus Torvalds's avatar
Linus Torvalds committed
60
61
62
#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
#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
75
#include <linux/jiffies.h>
76
#include <linux/preempt.h>
Jay Vosburgh's avatar
Jay Vosburgh committed
77
#include <net/route.h>
78
#include <net/net_namespace.h>
79
#include <net/netns/generic.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
101
102
static char *lacp_rate;
static char *ad_select;
static char *xmit_hash_policy;
Linus Torvalds's avatar
Linus Torvalds committed
103
static int arp_interval = BOND_LINK_ARP_INTERV;
Stephen Hemminger's avatar
Stephen Hemminger committed
104
105
106
static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *fail_over_mac;
107
static int all_slaves_active = 0;
108
static struct bond_params bonding_defaults;
109
static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
Linus Torvalds's avatar
Linus Torvalds committed
110
111
112

module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
113
114
module_param(tx_queues, int, 0);
MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
115
116
117
118
module_param_named(num_grat_arp, num_peer_notif, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on failover event (alias of num_unsol_na)");
module_param_named(num_unsol_na, num_peer_notif, int, 0644);
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
119
120
121
122
123
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);
124
125
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
			    "in milliseconds");
Linus Torvalds's avatar
Linus Torvalds committed
126
module_param(use_carrier, int, 0);
127
128
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
129
module_param(mode, charp, 0);
130
131
132
133
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
134
135
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
136
137
138
139
140
141
142
143
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
144
module_param(lacp_rate, charp, 0);
145
146
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
			    "(slow/fast)");
147
148
module_param(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
149
module_param(xmit_hash_policy, charp, 0);
150
151
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
152
153
154
155
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");
156
157
module_param(arp_validate, charp, 0);
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
158
159
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");
160
161
162
163
module_param(all_slaves_active, int, 0);
MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
				     "by setting active flag for all slaves.  "
				     "0 for never (default), 1 for always.");
164
165
module_param(resend_igmp, int, 0);
MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on link failure");
Linus Torvalds's avatar
Linus Torvalds committed
166
167
168

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

169
#ifdef CONFIG_NET_POLL_CONTROLLER
170
atomic_t netpoll_block_tx = ATOMIC_INIT(0);
171
172
#endif

173
int bond_net_id __read_mostly;
Linus Torvalds's avatar
Linus Torvalds committed
174

Stephen Hemminger's avatar
Stephen Hemminger committed
175
176
static __be32 arp_target[BOND_MAX_ARP_TARGETS];
static int arp_ip_count;
Linus Torvalds's avatar
Linus Torvalds committed
177
static int bond_mode	= BOND_MODE_ROUNDROBIN;
Stephen Hemminger's avatar
Stephen Hemminger committed
178
179
static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;
Linus Torvalds's avatar
Linus Torvalds committed
180

181
const struct bond_parm_tbl bond_lacp_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
182
183
184
185
186
{	"slow",		AD_LACP_SLOW},
{	"fast",		AD_LACP_FAST},
{	NULL,		-1},
};

187
const struct bond_parm_tbl bond_mode_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
188
189
190
191
192
193
194
195
196
197
{	"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},
};

198
const struct bond_parm_tbl xmit_hashtype_tbl[] = {
199
200
{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
201
{	"layer2+3",		BOND_XMIT_POLICY_LAYER23},
202
203
204
{	NULL,			-1},
};

205
const struct bond_parm_tbl arp_validate_tbl[] = {
206
207
208
209
210
211
212
{	"none",			BOND_ARP_VALIDATE_NONE},
{	"active",		BOND_ARP_VALIDATE_ACTIVE},
{	"backup",		BOND_ARP_VALIDATE_BACKUP},
{	"all",			BOND_ARP_VALIDATE_ALL},
{	NULL,			-1},
};

213
const struct bond_parm_tbl fail_over_mac_tbl[] = {
214
215
216
217
218
219
{	"none",			BOND_FOM_NONE},
{	"active",		BOND_FOM_ACTIVE},
{	"follow",		BOND_FOM_FOLLOW},
{	NULL,			-1},
};

220
221
222
223
224
225
226
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},
};

227
228
229
230
231
232
233
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
234
235
/*-------------------------- Forward declarations ---------------------------*/

236
static int bond_init(struct net_device *bond_dev);
237
static void bond_uninit(struct net_device *bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
238
239
240

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

241
const char *bond_mode_name(int mode)
Linus Torvalds's avatar
Linus Torvalds committed
242
{
243
244
245
246
247
	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
248
		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
249
250
251
252
253
		[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
254
		return "unknown";
255
256

	return names[mode];
Linus Torvalds's avatar
Linus Torvalds committed
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
}

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

272
	pr_debug("bond: %s, vlan id %d\n",
273
		 (bond ? bond->dev->name : "None"), vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
274

275
	vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
Stephen Hemminger's avatar
Stephen Hemminger committed
276
	if (!vlan)
Linus Torvalds's avatar
Linus Torvalds committed
277
278
279
280
281
282
283
284
285
286
287
		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);

288
	pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
289
290
291
292
293
294
295
296
297
298
299
300
301

	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)
{
302
	struct vlan_entry *vlan;
Linus Torvalds's avatar
Linus Torvalds committed
303
304
	int res = -ENODEV;

305
	pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
306

307
	block_netpoll_tx();
Linus Torvalds's avatar
Linus Torvalds committed
308
309
	write_lock_bh(&bond->lock);

310
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
Linus Torvalds's avatar
Linus Torvalds committed
311
312
313
		if (vlan->vlan_id == vlan_id) {
			list_del(&vlan->vlan_list);

314
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
315
316
				bond_alb_clear_vlan(bond, vlan_id);

317
318
			pr_debug("removed VLAN ID %d from bond %s\n",
				 vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336

			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;
		}
	}

337
338
	pr_debug("couldn't find VLAN ID %d in bond %s\n",
		 vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
339
340
341

out:
	write_unlock_bh(&bond->lock);
342
	unblock_netpoll_tx();
Linus Torvalds's avatar
Linus Torvalds committed
343
344
345
346
347
348
349
350
351
352
	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
353
 *
Linus Torvalds's avatar
Linus Torvalds committed
354
355
356
357
358
359
 * 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
360
	if (list_empty(&bond->vlan_list))
Linus Torvalds's avatar
Linus Torvalds committed
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
		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
383
 *
Linus Torvalds's avatar
Linus Torvalds committed
384
385
386
387
 * @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
388
389
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
			struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
390
{
391
	skb->dev = slave_dev;
Linus Torvalds's avatar
Linus Torvalds committed
392
	skb->priority = 1;
393
	if (unlikely(netpoll_tx_running(slave_dev)))
394
		bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
395
	else
396
		dev_queue_xmit(skb);
Linus Torvalds's avatar
Linus Torvalds committed
397
398
399
400
401
402
403
404
405
406
407
408

	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.
Stephen Hemminger's avatar
Stephen Hemminger committed
409
 *
Linus Torvalds's avatar
Linus Torvalds committed
410
411
412
413
414
415
416
417
418
419
420
421
422
423
 * 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
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
424
425
static void bond_vlan_rx_register(struct net_device *bond_dev,
				  struct vlan_group *grp)
Linus Torvalds's avatar
Linus Torvalds committed
426
{
427
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
428
429
430
	struct slave *slave;
	int i;

431
	write_lock_bh(&bond->lock);
Linus Torvalds's avatar
Linus Torvalds committed
432
	bond->vlgrp = grp;
433
	write_unlock_bh(&bond->lock);
Linus Torvalds's avatar
Linus Torvalds committed
434
435
436

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
437
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
438
439

		if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
440
441
		    slave_ops->ndo_vlan_rx_register) {
			slave_ops->ndo_vlan_rx_register(slave_dev, grp);
Linus Torvalds's avatar
Linus Torvalds committed
442
443
444
445
446
447
448
449
450
451
452
		}
	}
}

/**
 * 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)
{
453
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
454
455
456
457
458
	struct slave *slave;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
459
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
460
461

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
462
463
		    slave_ops->ndo_vlan_rx_add_vid) {
			slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
Linus Torvalds's avatar
Linus Torvalds committed
464
465
466
467
468
		}
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
469
		pr_err("%s: Error: Failed to add vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
470
471
472
473
474
475
476
477
478
479
480
		       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)
{
481
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
482
483
484
485
486
487
	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;
488
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
489
490

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
491
		    slave_ops->ndo_vlan_rx_kill_vid) {
Linus Torvalds's avatar
Linus Torvalds committed
492
493
494
			/* Save and then restore vlan_dev in the grp array,
			 * since the slave's driver might clear it.
			 */
495
			vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
496
			slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
497
			vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
498
499
500
501
502
		}
	}

	res = bond_del_vlan(bond, vid);
	if (res) {
503
		pr_err("%s: Error: Failed to remove vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
504
505
506
507
508
509
510
		       bond_dev->name, vid);
	}
}

static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;
511
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
512

513
	if (!bond->vlgrp)
514
		return;
Linus Torvalds's avatar
Linus Torvalds committed
515
516

	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
517
518
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
Linus Torvalds's avatar
Linus Torvalds committed
519
520

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
521
	    !(slave_ops->ndo_vlan_rx_add_vid))
522
		return;
Linus Torvalds's avatar
Linus Torvalds committed
523

524
525
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
		slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
526
527
}

Stephen Hemminger's avatar
Stephen Hemminger committed
528
529
static void bond_del_vlans_from_slave(struct bonding *bond,
				      struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
530
{
531
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
532
533
534
	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

535
	if (!bond->vlgrp)
536
		return;
Linus Torvalds's avatar
Linus Torvalds committed
537
538

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
539
	    !(slave_ops->ndo_vlan_rx_kill_vid))
Linus Torvalds's avatar
Linus Torvalds committed
540
541
542
		goto unreg;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
543
544
		if (!vlan->vlan_id)
			continue;
Linus Torvalds's avatar
Linus Torvalds committed
545
546
547
		/* Save and then restore vlan_dev in the grp array,
		 * since the slave's driver might clear it.
		 */
548
		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
549
		slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
550
		vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
551
552
553
554
	}

unreg:
	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
555
556
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
557
558
559
560
}

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

561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/*
 * 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
597
598
599
600
601
602
603
604
605
/*
 * 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;
606
607
	struct ethtool_cmd etool = { .cmd = ETHTOOL_GSET };
	u32 slave_speed;
608
	int res;
Linus Torvalds's avatar
Linus Torvalds committed
609
610
611
612
613

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

614
615
	if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
		return -1;
Linus Torvalds's avatar
Linus Torvalds committed
616

617
618
	res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
	if (res < 0)
Linus Torvalds's avatar
Linus Torvalds committed
619
620
		return -1;

621
622
	slave_speed = ethtool_cmd_speed(&etool);
	switch (slave_speed) {
Linus Torvalds's avatar
Linus Torvalds committed
623
624
625
	case SPEED_10:
	case SPEED_100:
	case SPEED_1000:
626
	case SPEED_10000:
Linus Torvalds's avatar
Linus Torvalds committed
627
628
629
630
631
632
633
634
635
636
637
638
639
		break;
	default:
		return -1;
	}

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

640
	slave->speed = slave_speed;
Linus Torvalds's avatar
Linus Torvalds committed
641
642
643
644
645
646
647
648
649
	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(),
Stephen Hemminger's avatar
Stephen Hemminger committed
650
 * depending upon the setting of the use_carrier parameter.
Linus Torvalds's avatar
Linus Torvalds committed
651
652
653
654
655
656
657
658
659
660
661
 *
 * 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
662
663
static int bond_check_dev_link(struct bonding *bond,
			       struct net_device *slave_dev, int reporting)
Linus Torvalds's avatar
Linus Torvalds committed
664
{
665
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
666
	int (*ioctl)(struct net_device *, struct ifreq *, int);
Linus Torvalds's avatar
Linus Torvalds committed
667
668
669
	struct ifreq ifr;
	struct mii_ioctl_data *mii;

670
671
672
	if (!reporting && !netif_running(slave_dev))
		return 0;

673
	if (bond->params.use_carrier)
Linus Torvalds's avatar
Linus Torvalds committed
674
675
		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;

676
677
678
679
680
681
682
683
684
685
686
	/* Try to get link status using Ethtool first. */
	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;
		}
	}

Stephen Hemminger's avatar
Stephen Hemminger committed
687
	/* Ethtool can't be used, fallback to MII ioctls. */
688
	ioctl = slave_ops->ndo_do_ioctl;
Linus Torvalds's avatar
Linus Torvalds committed
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
	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
707
708
			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
				return mii->val_out & BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
709
710
711
712
713
		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
714
	 * or both SIOCGMIIREG and get_link failed (meaning that we
Linus Torvalds's avatar
Linus Torvalds committed
715
716
717
	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
Stephen Hemminger's avatar
Stephen Hemminger committed
718
	return reporting ? -1 : BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
719
720
721
722
723
724
725
}

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

/*
 * Push the promiscuity flag down to appropriate slaves
 */
726
static int bond_set_promiscuity(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
727
{
728
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
729
730
731
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
732
733
			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
Linus Torvalds's avatar
Linus Torvalds committed
734
735
736
737
738
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
739
740
741
			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
742
743
		}
	}
744
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
745
746
747
748
749
}

/*
 * Push the allmulti flag down to all slaves
 */
750
static int bond_set_allmulti(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
751
{
752
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
753
754
755
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
756
757
			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
Linus Torvalds's avatar
Linus Torvalds committed
758
759
760
761
762
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
763
764
765
			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
766
767
		}
	}
768
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
769
770
771
772
773
774
}

/*
 * Add a Multicast address to slaves
 * according to mode
 */
775
static void bond_mc_add(struct bonding *bond, void *addr)
Linus Torvalds's avatar
Linus Torvalds committed
776
777
778
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
Stephen Hemminger's avatar
Stephen Hemminger committed
779
		if (bond->curr_active_slave)
780
			dev_mc_add(bond->curr_active_slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
781
782
783
	} else {
		struct slave *slave;
		int i;
Stephen Hemminger's avatar
Stephen Hemminger committed
784
785

		bond_for_each_slave(bond, slave, i)
786
			dev_mc_add(slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
787
788
789
790
791
792
793
	}
}

/*
 * Remove a multicast address from slave
 * according to mode
 */
794
static void bond_mc_del(struct bonding *bond, void *addr)
Linus Torvalds's avatar
Linus Torvalds committed
795
796
797
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
Stephen Hemminger's avatar
Stephen Hemminger committed
798
		if (bond->curr_active_slave)
799
			dev_mc_del(bond->curr_active_slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
800
801
802
803
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
804
			dev_mc_del(slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
805
806
807
808
		}
	}
}

809

810
static void __bond_resend_igmp_join_requests(struct net_device *dev)
811
812
813
814
{
	struct in_device *in_dev;

	rcu_read_lock();
815
	in_dev = __in_dev_get_rcu(dev);
Eric Dumazet's avatar
Eric Dumazet committed
816
	if (in_dev)
817
		ip_mc_rejoin_groups(in_dev);
818
819
820
	rcu_read_unlock();
}

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
/*
 * 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 net_device *vlan_dev;
	struct vlan_entry *vlan;

	read_lock(&bond->lock);

	/* rejoin all groups on bond device */
	__bond_resend_igmp_join_requests(bond->dev);

	/* rejoin all groups on vlan devices */
	if (bond->vlgrp) {
		list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
			vlan_dev = vlan_group_get_device(bond->vlgrp,
							 vlan->vlan_id);
			if (vlan_dev)
				__bond_resend_igmp_join_requests(vlan_dev);
		}
	}

846
847
848
	if (--bond->igmp_retrans > 0)
		queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);

849
850
851
	read_unlock(&bond->lock);
}

852
static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
853
854
855
856
857
858
{
	struct bonding *bond = container_of(work, struct bonding,
							mcast_work.work);
	bond_resend_igmp_join_requests(bond);
}

Linus Torvalds's avatar
Linus Torvalds committed
859
860
861
/*
 * flush all members of flush->mc_list from device dev->mc_list
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
862
863
static void bond_mc_list_flush(struct net_device *bond_dev,
			       struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
864
{
865
	struct bonding *bond = netdev_priv(bond_dev);
866
	struct netdev_hw_addr *ha;
Linus Torvalds's avatar
Linus Torvalds committed
867

868
869
	netdev_for_each_mc_addr(ha, bond_dev)
		dev_mc_del(slave_dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
870
871
872
873
874

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

875
		dev_mc_del(slave_dev, lacpdu_multicast);
Linus Torvalds's avatar
Linus Torvalds committed
876
877
878
879
880
881
882
883
884
885
	}
}

/*--------------------------- 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.
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
886
887
static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
			 struct slave *old_active)
Linus Torvalds's avatar
Linus Torvalds committed
888
{
889
	struct netdev_hw_addr *ha;
Linus Torvalds's avatar
Linus Torvalds committed
890

Stephen Hemminger's avatar
Stephen Hemminger committed
891
	if (!USES_PRIMARY(bond->params.mode))
Linus Torvalds's avatar
Linus Torvalds committed
892
893
894
895
896
897
		/* nothing to do -  mc list is already up-to-date on
		 * all slaves
		 */
		return;

	if (old_active) {
Stephen Hemminger's avatar
Stephen Hemminger committed
898
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
899
900
			dev_set_promiscuity(old_active->dev, -1);

Stephen Hemminger's avatar
Stephen Hemminger committed
901
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
902
903
			dev_set_allmulti(old_active->dev, -1);

904
905
		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_del(old_active->dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
906
907
908
	}

	if (new_active) {
909
		/* FIXME: Signal errors upstream. */
Stephen Hemminger's avatar
Stephen Hemminger committed
910
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
911
912
			dev_set_promiscuity(new_active->dev, 1);

Stephen Hemminger's avatar
Stephen Hemminger committed
913
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
914
915
			dev_set_allmulti(new_active->dev, 1);

916
917
		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_add(new_active->dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
918
919
920
	}
}

921
922
923
924
925
926
927
928
929
930
/*
 * 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)
931
932
933
934
	__releases(&bond->curr_slave_lock)
	__releases(&bond->lock)
	__acquires(&bond->lock)
	__acquires(&bond->curr_slave_lock)
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
{
	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) {
970
			pr_err("%s: Error %d setting MAC of slave %s\n",
971
972
973
974
975
976
977
978
979
980
981
982
			       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)
983
			pr_err("%s: Error %d setting MAC of slave %s\n",
984
985
986
987
988
989
			       bond->dev->name, -rv, new_active->dev->name);
out:
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);
		break;
	default:
990
		pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
991
992
993
994
995
996
		       bond->dev->name, bond->params.fail_over_mac);
		break;
	}

}

997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
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;
}
1016

Linus Torvalds's avatar
Linus Torvalds committed
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
/**
 * 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;

1030
	new_active = bond->curr_active_slave;
Linus Torvalds's avatar
Linus Torvalds committed
1031
1032

	if (!new_active) { /* there were no active slaves left */
Stephen Hemminger's avatar
Stephen Hemminger committed
1033
		if (bond->slave_cnt > 0)   /* found one slave */
Linus Torvalds's avatar
Linus Torvalds committed
1034
			new_active = bond->first_slave;
Stephen Hemminger's avatar
Stephen Hemminger committed
1035
		else
Linus Torvalds's avatar
Linus Torvalds committed
1036
1037
1038
1039
			return NULL; /* still no slave, return NULL */
	}

	if ((bond->primary_slave) &&
1040
1041
	    bond->primary_slave->link == BOND_LINK_UP &&
	    bond_should_change_active(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1042
1043
1044
1045
1046
1047
1048
		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) {
1049
1050
1051
1052
1053
1054
1055
1056
		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
1057
1058
1059
1060
1061
1062
1063
			}
		}
	}

	return bestslave;
}

1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
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
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
/**
 * 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.
 *
1092
1093
 * 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
1094
 */
1095
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1096
1097
1098
{
	struct slave *old_active = bond->curr_active_slave;

Stephen Hemminger's avatar
Stephen Hemminger committed
1099
	if (old_active == new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1100
1101
1102
		return;

	if (new_active) {
1103
1104
		new_active->jiffies = jiffies;

Linus Torvalds's avatar
Linus Torvalds committed
1105
1106
		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
1107
1108
1109
				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
1110
1111
1112
1113
1114
			}

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

Stephen Hemminger's avatar
Stephen Hemminger committed
1115
			if (bond->params.mode == BOND_MODE_8023AD)
Linus Torvalds's avatar
Linus Torvalds committed
1116
1117
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);

1118
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
1119
1120
1121
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
1122
1123
				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
1124
1125
1126
1127
			}
		}
	}

Stephen Hemminger's avatar
Stephen Hemminger committed
1128
	if (USES_PRIMARY(bond->params.mode))
Linus Torvalds's avatar
Linus Torvalds committed
1129
1130
		bond_mc_swap(bond, new_active, old_active);

1131
	if (bond_is_lb(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1132
		bond_alb_handle_active_change(bond, new_active);
1133
1134
1135
1136
		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
1137
1138
1139
	} else {
		bond->curr_active_slave = new_active;
	}
Jay Vosburgh's avatar
Jay Vosburgh committed
1140
1141

	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
Stephen Hemminger's avatar
Stephen Hemminger committed
1142
		if (old_active)
Jay Vosburgh's avatar
Jay Vosburgh committed
1143
1144
1145
			bond_set_slave_inactive_flags(old_active);

		if (new_active) {
1146
1147
			bool should_notify_peers = false;

Jay Vosburgh's avatar
Jay Vosburgh committed
1148
			bond_set_slave_active_flags(new_active);
1149

1150
1151
1152
			if (bond->params.fail_over_mac)
				bond_do_fail_over_mac(bond, new_active,
						      old_active);
1153

1154
1155
1156
1157
1158
1159
1160
			if (netif_running(bond->dev)) {
				bond->send_peer_notif =
					bond->params.num_peer_notif;
				should_notify_peers =
					bond_should_notify_peers(bond);
			}

1161
1162
1163
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);

1164
			netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1165
1166
1167
			if (should_notify_peers)
				netdev_bonding_change(bond->dev,
						      NETDEV_NOTIFY_PEERS);
1168
1169
1170

			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
1171
		}
Jay Vosburgh's avatar
Jay Vosburgh committed
1172
	}
1173

1174
1175
	/* resend IGMP joins since active slave has changed or
	 * all were sent on curr_active_slave */
1176
1177
1178
	if (((USES_PRIMARY(bond->params.mode) && new_active) ||
	     bond->params.mode == BOND_MODE_ROUNDROBIN) &&
	    netif_running(bond->dev)) {
1179
		bond->igmp_retrans = bond->params.resend_igmp;
1180
		queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1181
	}
Linus Torvalds's avatar
Linus Torvalds committed
1182
1183
1184
1185
1186
1187
}

/**
 * bond_select_active_slave - select a new active slave, if needed
 * @bond: our bonding struct
 *
Stephen Hemminger's avatar
Stephen Hemminger committed
1188
 * This functions should be called when one of the following occurs:
Linus Torvalds's avatar
Linus Torvalds committed
1189
1190
1191
1192
 * - 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.
 *
1193
 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1194
 */
1195
void bond_select_active_slave(struct bonding *bond)
Linus Torvalds's avatar
Linus Torvalds committed
1196
1197
{
	struct slave *best_slave;
1198
	int rv;
Linus Torvalds's avatar
Linus Torvalds committed
1199
1200
1201
1202

	best_slave = bond_find_best_slave(bond);
	if (best_slave != bond->curr_active_slave) {
		bond_change_active_slave(bond, best_slave);
1203
1204
1205
1206
1207
		rv = bond_set_carrier(bond);
		if (!rv)
			return;

		if (netif_carrier_ok(bond->dev)) {
1208
1209
			pr_info("%s: first active interface up!\n",
				bond->dev->name);
1210
		} else {
1211
1212
			pr_info("%s: now running without any active interface !\n",
				bond->dev->name);
1213
		}
Linus Torvalds's avatar
Linus Torvalds committed
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
	}
}

/*--------------------------- 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
1252
	if (slave->next)
Linus Torvalds's avatar
Linus Torvalds committed
1253
1254
		slave->next->prev = slave->prev;

Stephen Hemminger's avatar
Stephen Hemminger committed
1255
	if (slave->prev)
Linus Torvalds's avatar
Linus Torvalds committed
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
		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--;
}

1271
#ifdef CONFIG_NET_POLL_CONTROLLER
1272
static inline int slave_enable_netpoll(struct slave *slave)
1273
{
1274
1275
	struct netpoll *np;
	int err = 0;
1276

1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
	np = kzalloc(sizeof(*np), GFP_KERNEL);
	err = -ENOMEM;
	if (!np)
		goto out;

	np->dev = slave->dev;
	err = __netpoll_setup(np);
	if (err) {
		kfree(np);
		goto out;
1287
	}
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
	slave->np = np;
out:
	return err;
}
static inline void slave_disable_netpoll(struct slave *slave)
{
	struct netpoll *np = slave->np;

	if (!np)
		return;

	slave->np = NULL;
	synchronize_rcu_bh();
	__netpoll_cleanup(np);
	kfree(np);
}
static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
{
	if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
		return false;
	if (!slave_dev->netdev_ops->ndo_poll_controller)
		return false;
	return true;
1311
1312
1313
1314
}

static void bond_poll_controller(struct net_device *bond_dev)
{
1315
1316
1317
1318
}

static void __bond_netpoll_cleanup(struct bonding *bond)
{
Neil Horman's avatar