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
static char *lacp_rate;
101
static int min_links;
Stephen Hemminger's avatar
Stephen Hemminger committed
102
103
static char *ad_select;
static char *xmit_hash_policy;
Linus Torvalds's avatar
Linus Torvalds committed
104
static int arp_interval = BOND_LINK_ARP_INTERV;
Stephen Hemminger's avatar
Stephen Hemminger committed
105
106
107
static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *fail_over_mac;
108
static int all_slaves_active = 0;
109
static struct bond_params bonding_defaults;
110
static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
Linus Torvalds's avatar
Linus Torvalds committed
111
112
113

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	write_lock_bh(&bond->lock);

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

	write_unlock_bh(&bond->lock);

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

	return 0;
}

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

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

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

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

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

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

			kfree(vlan);

			res = 0;
			goto out;
		}
	}

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

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

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

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

385
386
#define bond_queue_mapping(skb) (*(u16 *)((skb)->cb))

Linus Torvalds's avatar
Linus Torvalds committed
387
388
/**
 * bond_dev_queue_xmit - Prepare skb for xmit.
Stephen Hemminger's avatar
Stephen Hemminger committed
389
 *
Linus Torvalds's avatar
Linus Torvalds committed
390
391
392
393
 * @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
394
395
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
			struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
396
{
397
	skb->dev = slave_dev;
Linus Torvalds's avatar
Linus Torvalds committed
398
	skb->priority = 1;
399
400
401

	skb->queue_mapping = bond_queue_mapping(skb);

402
	if (unlikely(netpoll_tx_running(slave_dev)))
403
		bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
404
	else
405
		dev_queue_xmit(skb);
Linus Torvalds's avatar
Linus Torvalds committed
406
407
408
409
410
411
412
413
414
415
416
417

	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
418
 *
Linus Torvalds's avatar
Linus Torvalds committed
419
420
421
422
423
424
425
426
427
428
429
430
431
432
 * 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
433
434
static void bond_vlan_rx_register(struct net_device *bond_dev,
				  struct vlan_group *grp)
Linus Torvalds's avatar
Linus Torvalds committed
435
{
436
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
437
438
439
	struct slave *slave;
	int i;

440
	write_lock_bh(&bond->lock);
Linus Torvalds's avatar
Linus Torvalds committed
441
	bond->vlgrp = grp;
442
	write_unlock_bh(&bond->lock);
Linus Torvalds's avatar
Linus Torvalds committed
443
444
445

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
446
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
447
448

		if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
449
450
		    slave_ops->ndo_vlan_rx_register) {
			slave_ops->ndo_vlan_rx_register(slave_dev, grp);
Linus Torvalds's avatar
Linus Torvalds committed
451
452
453
454
455
456
457
458
459
460
461
		}
	}
}

/**
 * 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)
{
462
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
463
464
465
466
467
	struct slave *slave;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
468
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
469
470

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
471
472
		    slave_ops->ndo_vlan_rx_add_vid) {
			slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
Linus Torvalds's avatar
Linus Torvalds committed
473
474
475
476
477
		}
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
478
		pr_err("%s: Error: Failed to add vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
479
480
481
482
483
484
485
486
487
488
489
		       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)
{
490
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
491
492
493
494
495
496
	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;
497
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
498
499

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
500
		    slave_ops->ndo_vlan_rx_kill_vid) {
Linus Torvalds's avatar
Linus Torvalds committed
501
502
503
			/* Save and then restore vlan_dev in the grp array,
			 * since the slave's driver might clear it.
			 */
504
			vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
505
			slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
506
			vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
507
508
509
510
511
		}
	}

	res = bond_del_vlan(bond, vid);
	if (res) {
512
		pr_err("%s: Error: Failed to remove vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
513
514
515
516
517
518
519
		       bond_dev->name, vid);
	}
}

static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;
520
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
521

522
	if (!bond->vlgrp)
523
		return;
Linus Torvalds's avatar
Linus Torvalds committed
524
525

	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
526
527
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
Linus Torvalds's avatar
Linus Torvalds committed
528
529

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
530
	    !(slave_ops->ndo_vlan_rx_add_vid))
531
		return;
Linus Torvalds's avatar
Linus Torvalds committed
532

533
534
	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
535
536
}

Stephen Hemminger's avatar
Stephen Hemminger committed
537
538
static void bond_del_vlans_from_slave(struct bonding *bond,
				      struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
539
{
540
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
541
542
543
	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

544
	if (!bond->vlgrp)
545
		return;
Linus Torvalds's avatar
Linus Torvalds committed
546
547

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
548
	    !(slave_ops->ndo_vlan_rx_kill_vid))
Linus Torvalds's avatar
Linus Torvalds committed
549
550
551
		goto unreg;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
552
553
		if (!vlan->vlan_id)
			continue;
Linus Torvalds's avatar
Linus Torvalds committed
554
555
556
		/* Save and then restore vlan_dev in the grp array,
		 * since the slave's driver might clear it.
		 */
557
		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
558
		slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
559
		vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
560
561
562
563
	}

unreg:
	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
564
565
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
566
567
568
569
}

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

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
597
598
599
600
601
602
603
604
605
/*
 * 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
606
607
608
609
610
611
612
613
614
/*
 * 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;
615
616
	struct ethtool_cmd etool = { .cmd = ETHTOOL_GSET };
	u32 slave_speed;
617
	int res;
Linus Torvalds's avatar
Linus Torvalds committed
618
619
620
621
622

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

623
624
	if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
		return -1;
Linus Torvalds's avatar
Linus Torvalds committed
625

626
627
	res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
	if (res < 0)
Linus Torvalds's avatar
Linus Torvalds committed
628
629
		return -1;

630
	slave_speed = ethtool_cmd_speed(&etool);
Jiri Pirko's avatar
Jiri Pirko committed
631
	if (slave_speed == 0 || slave_speed == ((__u32) -1))
Linus Torvalds's avatar
Linus Torvalds committed
632
633
634
635
636
637
638
639
640
641
		return -1;

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

642
	slave->speed = slave_speed;
Linus Torvalds's avatar
Linus Torvalds committed
643
644
645
646
647
648
649
650
651
	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
652
 * depending upon the setting of the use_carrier parameter.
Linus Torvalds's avatar
Linus Torvalds committed
653
654
655
656
657
658
659
660
661
662
663
 *
 * 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
664
665
static int bond_check_dev_link(struct bonding *bond,
			       struct net_device *slave_dev, int reporting)
Linus Torvalds's avatar
Linus Torvalds committed
666
{
667
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
668
	int (*ioctl)(struct net_device *, struct ifreq *, int);
Linus Torvalds's avatar
Linus Torvalds committed
669
670
671
	struct ifreq ifr;
	struct mii_ioctl_data *mii;

672
673
674
	if (!reporting && !netif_running(slave_dev))
		return 0;

675
	if (bond->params.use_carrier)
Linus Torvalds's avatar
Linus Torvalds committed
676
677
		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;

678
679
680
681
682
683
684
685
686
687
688
	/* 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
689
	/* Ethtool can't be used, fallback to MII ioctls. */
690
	ioctl = slave_ops->ndo_do_ioctl;
Linus Torvalds's avatar
Linus Torvalds committed
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
	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
709
710
			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
				return mii->val_out & BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
711
712
713
714
715
		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
716
	 * or both SIOCGMIIREG and get_link failed (meaning that we
Linus Torvalds's avatar
Linus Torvalds committed
717
718
719
	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
Stephen Hemminger's avatar
Stephen Hemminger committed
720
	return reporting ? -1 : BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
721
722
723
724
725
726
727
}

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

/*
 * Push the promiscuity flag down to appropriate slaves
 */
728
static int bond_set_promiscuity(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
729
{
730
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
731
732
733
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
734
735
			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
Linus Torvalds's avatar
Linus Torvalds committed
736
737
738
739
740
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
741
742
743
			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
744
745
		}
	}
746
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
747
748
749
750
751
}

/*
 * Push the allmulti flag down to all slaves
 */
752
static int bond_set_allmulti(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
753
{
754
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
755
756
757
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
758
759
			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
Linus Torvalds's avatar
Linus Torvalds committed
760
761
762
763
764
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
765
766
767
			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
768
769
		}
	}
770
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
771
772
773
774
775
776
}

/*
 * Add a Multicast address to slaves
 * according to mode
 */
777
static void bond_mc_add(struct bonding *bond, void *addr)
Linus Torvalds's avatar
Linus Torvalds committed
778
779
780
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
Stephen Hemminger's avatar
Stephen Hemminger committed
781
		if (bond->curr_active_slave)
782
			dev_mc_add(bond->curr_active_slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
783
784
785
	} else {
		struct slave *slave;
		int i;
Stephen Hemminger's avatar
Stephen Hemminger committed
786
787

		bond_for_each_slave(bond, slave, i)
788
			dev_mc_add(slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
789
790
791
792
793
794
795
	}
}

/*
 * Remove a multicast address from slave
 * according to mode
 */
796
static void bond_mc_del(struct bonding *bond, void *addr)
Linus Torvalds's avatar
Linus Torvalds committed
797
798
799
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
Stephen Hemminger's avatar
Stephen Hemminger committed
800
		if (bond->curr_active_slave)
801
			dev_mc_del(bond->curr_active_slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
802
803
804
805
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
806
			dev_mc_del(slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
807
808
809
810
		}
	}
}

811

812
static void __bond_resend_igmp_join_requests(struct net_device *dev)
813
814
815
816
{
	struct in_device *in_dev;

	rcu_read_lock();
817
	in_dev = __in_dev_get_rcu(dev);
Eric Dumazet's avatar
Eric Dumazet committed
818
	if (in_dev)
819
		ip_mc_rejoin_groups(in_dev);
820
821
822
	rcu_read_unlock();
}

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
/*
 * 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);
		}
	}

848
849
850
	if (--bond->igmp_retrans > 0)
		queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);

851
852
853
	read_unlock(&bond->lock);
}

854
static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
855
856
{
	struct bonding *bond = container_of(work, struct bonding,
857
					    mcast_work.work);
858
859
860
	bond_resend_igmp_join_requests(bond);
}

Linus Torvalds's avatar
Linus Torvalds committed
861
862
863
/*
 * flush all members of flush->mc_list from device dev->mc_list
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
864
865
static void bond_mc_list_flush(struct net_device *bond_dev,
			       struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
866
{
867
	struct bonding *bond = netdev_priv(bond_dev);
868
	struct netdev_hw_addr *ha;
Linus Torvalds's avatar
Linus Torvalds committed
869

870
871
	netdev_for_each_mc_addr(ha, bond_dev)
		dev_mc_del(slave_dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
872
873
874
875
876

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

877
		dev_mc_del(slave_dev, lacpdu_multicast);
Linus Torvalds's avatar
Linus Torvalds committed
878
879
880
881
882
883
884
885
886
887
	}
}

/*--------------------------- 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
888
889
static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
			 struct slave *old_active)
Linus Torvalds's avatar
Linus Torvalds committed
890
{
891
	struct netdev_hw_addr *ha;
Linus Torvalds's avatar
Linus Torvalds committed
892

Stephen Hemminger's avatar
Stephen Hemminger committed
893
	if (!USES_PRIMARY(bond->params.mode))
Linus Torvalds's avatar
Linus Torvalds committed
894
895
896
897
898
899
		/* nothing to do -  mc list is already up-to-date on
		 * all slaves
		 */
		return;

	if (old_active) {
Stephen Hemminger's avatar
Stephen Hemminger committed
900
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
901
902
			dev_set_promiscuity(old_active->dev, -1);

Stephen Hemminger's avatar
Stephen Hemminger committed
903
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
904
905
			dev_set_allmulti(old_active->dev, -1);

906
907
		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_del(old_active->dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
908
909
910
	}

	if (new_active) {
911
		/* FIXME: Signal errors upstream. */
Stephen Hemminger's avatar
Stephen Hemminger committed
912
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
913
914
			dev_set_promiscuity(new_active->dev, 1);

Stephen Hemminger's avatar
Stephen Hemminger committed
915
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
916
917
			dev_set_allmulti(new_active->dev, 1);

918
919
		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_add(new_active->dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
920
921
922
	}
}

923
924
925
926
927
928
929
930
931
932
/*
 * 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)
933
934
935
936
	__releases(&bond->curr_slave_lock)
	__releases(&bond->lock)
	__acquires(&bond->lock)
	__acquires(&bond->curr_slave_lock)
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
{
	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) {
972
			pr_err("%s: Error %d setting MAC of slave %s\n",
973
974
975
976
977
978
979
980
981
982
983
984
			       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)
985
			pr_err("%s: Error %d setting MAC of slave %s\n",
986
987
988
989
990
991
			       bond->dev->name, -rv, new_active->dev->name);
out:
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);
		break;
	default:
992
		pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
993
994
995
996
997
998
		       bond->dev->name, bond->params.fail_over_mac);
		break;
	}

}

999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
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;
}
1018

Linus Torvalds's avatar
Linus Torvalds committed
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
/**
 * 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;

1032
	new_active = bond->curr_active_slave;
Linus Torvalds's avatar
Linus Torvalds committed
1033
1034

	if (!new_active) { /* there were no active slaves left */
Stephen Hemminger's avatar
Stephen Hemminger committed
1035
		if (bond->slave_cnt > 0)   /* found one slave */
Linus Torvalds's avatar
Linus Torvalds committed
1036
			new_active = bond->first_slave;
Stephen Hemminger's avatar
Stephen Hemminger committed
1037
		else
Linus Torvalds's avatar
Linus Torvalds committed
1038
1039
1040
1041
			return NULL; /* still no slave, return NULL */
	}

	if ((bond->primary_slave) &&
1042
1043
	    bond->primary_slave->link == BOND_LINK_UP &&
	    bond_should_change_active(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1044
1045
1046
1047
1048
1049
1050
		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) {
1051
1052
1053
1054
1055
1056
1057
1058
		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
1059
1060
1061
1062
1063
1064
1065
			}
		}
	}

	return bestslave;
}

1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
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
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
/**
 * 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.
 *
1094
1095
 * 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
1096
 */
1097
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1098
1099
1100
{
	struct slave *old_active = bond->curr_active_slave;

Stephen Hemminger's avatar
Stephen Hemminger committed
1101
	if (old_active == new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1102
1103
1104
		return;

	if (new_active) {
1105
1106
		new_active->jiffies = jiffies;

Linus Torvalds's avatar
Linus Torvalds committed
1107
1108
		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
1109
1110
1111
				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
1112
1113
1114
1115
1116
			}

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

Stephen Hemminger's avatar
Stephen Hemminger committed
1117
			if (bond->params.mode == BOND_MODE_8023AD)
Linus Torvalds's avatar
Linus Torvalds committed
1118
1119
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);

1120
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
1121
1122
1123
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
1124
1125
				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
1126
1127
1128
1129
			}
		}
	}

Stephen Hemminger's avatar
Stephen Hemminger committed
1130
	if (USES_PRIMARY(bond->params.mode))
Linus Torvalds's avatar
Linus Torvalds committed
1131
1132
		bond_mc_swap(bond, new_active, old_active);

1133
	if (bond_is_lb(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1134
		bond_alb_handle_active_change(bond, new_active);
1135
1136
1137
1138
		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
1139
1140
1141
	} else {
		bond->curr_active_slave = new_active;
	}
Jay Vosburgh's avatar
Jay Vosburgh committed
1142
1143

	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
Stephen Hemminger's avatar
Stephen Hemminger committed
1144
		if (old_active)
Jay Vosburgh's avatar
Jay Vosburgh committed
1145
1146
1147
			bond_set_slave_inactive_flags(old_active);

		if (new_active) {
1148
1149
			bool should_notify_peers = false;

Jay Vosburgh's avatar
Jay Vosburgh committed
1150
			bond_set_slave_active_flags(new_active);
1151

1152
1153
1154
			if (bond->params.fail_over_mac)
				bond_do_fail_over_mac(bond, new_active,
						      old_active);
1155

1156
1157
1158
1159
1160
1161
1162
			if (netif_running(bond->dev)) {
				bond->send_peer_notif =
					bond->params.num_peer_notif;
				should_notify_peers =
					bond_should_notify_peers(bond);
			}

1163
1164
1165
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);

1166
			netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1167
1168
1169
			if (should_notify_peers)
				netdev_bonding_change(bond->dev,
						      NETDEV_NOTIFY_PEERS);
1170
1171
1172

			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
1173
		}
Jay Vosburgh's avatar
Jay Vosburgh committed
1174
	}
1175

1176
	/* resend IGMP joins since active slave has changed or
1177
1178
1179
1180
1181
1182
	 * all were sent on curr_active_slave.
	 * resend only if bond is brought up with the affected
	 * bonding modes and the retransmission is enabled */
	if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
	    ((USES_PRIMARY(bond->params.mode) && new_active) ||
	     bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1183
		bond->igmp_retrans = bond->params.resend_igmp;
1184
		queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1185
	}
Linus Torvalds's avatar
Linus Torvalds committed
1186
1187
1188
1189
1190
1191
}

/**
 * bond_select_active_slave - select a new active slave, if needed
 * @bond: our bonding struct
 *
Stephen Hemminger's avatar
Stephen Hemminger committed
1192
 * This functions should be called when one of the following occurs:
Linus Torvalds's avatar
Linus Torvalds committed
1193
1194
1195
1196
 * - 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.
 *
1197
 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1198
 */
1199
void bond_select_active_slave(struct bonding *bond)
Linus Torvalds's avatar
Linus Torvalds committed
1200
1201
{
	struct slave *best_slave;
1202
	int rv;
Linus Torvalds's avatar
Linus Torvalds committed
1203
1204
1205
1206

	best_slave = bond_find_best_slave(bond);
	if (best_slave != bond->curr_active_slave) {
		bond_change_active_slave(bond, best_slave);
1207
1208
1209
1210
1211
		rv = bond_set_carrier(bond);
		if (!rv)
			return;

		if (netif_carrier_ok(bond->dev)) {
1212
1213
			pr_info("%s: first active interface up!\n",
				bond->dev->name);
1214
		} else {
1215
1216
			pr_info("%s: now running without any active interface !\n",
				bond->dev->name);
1217
		}
Linus Torvalds's avatar
Linus Torvalds committed
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
1252
1253
1254
1255
	}
}

/*--------------------------- 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
1256
	if (slave->next)
Linus Torvalds's avatar
Linus Torvalds committed
1257
1258
		slave->next->prev = slave->prev;

Stephen Hemminger's avatar
Stephen Hemminger committed
1259
	if (slave->prev)
Linus Torvalds's avatar
Linus Torvalds committed
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
		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--;
}

1275
#ifdef CONFIG_NET_POLL_CONTROLLER
1276
static inline int slave_enable_netpoll(struct slave *slave