bond_main.c 140 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
#include <linux/errno.h>
#include <linux/netdevice.h>
62
#include <linux/netpoll.h>
Linus Torvalds's avatar
Linus Torvalds committed
63
#include <linux/inetdevice.h>
64
#include <linux/igmp.h>
Linus Torvalds's avatar
Linus Torvalds committed
65
66
67
68
69
70
71
72
73
74
75
76
77
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/smp.h>
#include <linux/if_ether.h>
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
David Sterba's avatar
David Sterba committed
78
#include <linux/jiffies.h>
79
#include <linux/preempt.h>
Jay Vosburgh's avatar
Jay Vosburgh committed
80
#include <net/route.h>
81
#include <net/net_namespace.h>
82
#include <net/netns/generic.h>
Linus Torvalds's avatar
Linus Torvalds committed
83
84
85
86
87
88
89
90
91
92
93
#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;
94
static int tx_queues	= BOND_DEFAULT_TX_QUEUES;
95
static int num_grat_arp = 1;
96
static int num_unsol_na = 1;
Linus Torvalds's avatar
Linus Torvalds committed
97
static int miimon	= BOND_LINK_MON_INTERV;
Stephen Hemminger's avatar
Stephen Hemminger committed
98
99
static int updelay;
static int downdelay;
Linus Torvalds's avatar
Linus Torvalds committed
100
static int use_carrier	= 1;
Stephen Hemminger's avatar
Stephen Hemminger committed
101
102
static char *mode;
static char *primary;
103
static char *primary_reselect;
Stephen Hemminger's avatar
Stephen Hemminger committed
104
105
106
static char *lacp_rate;
static char *ad_select;
static char *xmit_hash_policy;
Linus Torvalds's avatar
Linus Torvalds committed
107
static int arp_interval = BOND_LINK_ARP_INTERV;
Stephen Hemminger's avatar
Stephen Hemminger committed
108
109
110
static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *fail_over_mac;
111
static int all_slaves_active = 0;
112
static struct bond_params bonding_defaults;
113
static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
Linus Torvalds's avatar
Linus Torvalds committed
114
115
116

module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
117
118
module_param(tx_queues, int, 0);
MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
119
120
module_param(num_grat_arp, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
121
122
module_param(num_unsol_na, int, 0644);
MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
Linus Torvalds's avatar
Linus Torvalds committed
123
124
125
126
127
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);
128
129
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
			    "in milliseconds");
Linus Torvalds's avatar
Linus Torvalds committed
130
module_param(use_carrier, int, 0);
131
132
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
133
module_param(mode, charp, 0);
134
135
136
137
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
138
139
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
140
141
142
143
144
145
146
147
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
148
module_param(lacp_rate, charp, 0);
149
150
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
			    "(slow/fast)");
151
152
module_param(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
153
module_param(xmit_hash_policy, charp, 0);
154
155
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
156
157
158
159
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");
160
161
module_param(arp_validate, charp, 0);
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
162
163
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");
164
165
166
167
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.");
168
169
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
170
171
172

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

173
#ifdef CONFIG_NET_POLL_CONTROLLER
174
atomic_t netpoll_block_tx = ATOMIC_INIT(0);
175
176
#endif

177
static const char * const version =
Linus Torvalds's avatar
Linus Torvalds committed
178
179
	DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";

180
int bond_net_id __read_mostly;
Linus Torvalds's avatar
Linus Torvalds committed
181

Stephen Hemminger's avatar
Stephen Hemminger committed
182
183
static __be32 arp_target[BOND_MAX_ARP_TARGETS];
static int arp_ip_count;
Linus Torvalds's avatar
Linus Torvalds committed
184
static int bond_mode	= BOND_MODE_ROUNDROBIN;
Stephen Hemminger's avatar
Stephen Hemminger committed
185
186
static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;
Linus Torvalds's avatar
Linus Torvalds committed
187

188
const struct bond_parm_tbl bond_lacp_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
189
190
191
192
193
{	"slow",		AD_LACP_SLOW},
{	"fast",		AD_LACP_FAST},
{	NULL,		-1},
};

194
const struct bond_parm_tbl bond_mode_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
195
196
197
198
199
200
201
202
203
204
{	"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},
};

205
const struct bond_parm_tbl xmit_hashtype_tbl[] = {
206
207
{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
208
{	"layer2+3",		BOND_XMIT_POLICY_LAYER23},
209
210
211
{	NULL,			-1},
};

212
const struct bond_parm_tbl arp_validate_tbl[] = {
213
214
215
216
217
218
219
{	"none",			BOND_ARP_VALIDATE_NONE},
{	"active",		BOND_ARP_VALIDATE_ACTIVE},
{	"backup",		BOND_ARP_VALIDATE_BACKUP},
{	"all",			BOND_ARP_VALIDATE_ALL},
{	NULL,			-1},
};

220
const struct bond_parm_tbl fail_over_mac_tbl[] = {
221
222
223
224
225
226
{	"none",			BOND_FOM_NONE},
{	"active",		BOND_FOM_ACTIVE},
{	"follow",		BOND_FOM_FOLLOW},
{	NULL,			-1},
};

227
228
229
230
231
232
233
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},
};

234
235
236
237
238
239
240
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
241
242
/*-------------------------- Forward declarations ---------------------------*/

Jay Vosburgh's avatar
Jay Vosburgh committed
243
static void bond_send_gratuitous_arp(struct bonding *bond);
244
static int bond_init(struct net_device *bond_dev);
245
static void bond_uninit(struct net_device *bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
246
247
248

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

249
static const char *bond_mode_name(int mode)
Linus Torvalds's avatar
Linus Torvalds committed
250
{
251
252
253
254
255
	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
256
		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
257
258
259
260
261
		[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
262
		return "unknown";
263
264

	return names[mode];
Linus Torvalds's avatar
Linus Torvalds committed
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
}

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

280
	pr_debug("bond: %s, vlan id %d\n",
281
		 (bond ? bond->dev->name : "None"), vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
282

283
	vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
Stephen Hemminger's avatar
Stephen Hemminger committed
284
	if (!vlan)
Linus Torvalds's avatar
Linus Torvalds committed
285
286
287
288
289
290
291
292
293
294
295
		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);

296
	pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
297
298
299
300
301
302
303
304
305
306
307
308
309

	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)
{
310
	struct vlan_entry *vlan;
Linus Torvalds's avatar
Linus Torvalds committed
311
312
	int res = -ENODEV;

313
	pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
314

315
	block_netpoll_tx();
Linus Torvalds's avatar
Linus Torvalds committed
316
317
	write_lock_bh(&bond->lock);

318
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
Linus Torvalds's avatar
Linus Torvalds committed
319
320
321
		if (vlan->vlan_id == vlan_id) {
			list_del(&vlan->vlan_list);

322
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
323
324
				bond_alb_clear_vlan(bond, vlan_id);

325
326
			pr_debug("removed VLAN ID %d from bond %s\n",
				 vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344

			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;
		}
	}

345
346
	pr_debug("couldn't find VLAN ID %d in bond %s\n",
		 vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
347
348
349

out:
	write_unlock_bh(&bond->lock);
350
	unblock_netpoll_tx();
Linus Torvalds's avatar
Linus Torvalds committed
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
	return res;
}

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

	bond_for_each_slave(bond, slave, i) {
		if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
370
			pr_debug("found VLAN challenged slave - %s\n",
371
				 slave->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
372
373
374
375
			return 1;
		}
	}

376
	pr_debug("no VLAN challenged slaves found\n");
Linus Torvalds's avatar
Linus Torvalds committed
377
378
379
380
381
382
383
384
385
386
	return 0;
}

/**
 * bond_next_vlan - safely skip to the next item in the vlans list.
 * @bond: the bond we're working on
 * @curr: item we're advancing from
 *
 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 * or @curr->next otherwise (even if it is @curr itself again).
Stephen Hemminger's avatar
Stephen Hemminger committed
387
 *
Linus Torvalds's avatar
Linus Torvalds committed
388
389
390
391
392
393
 * 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
394
	if (list_empty(&bond->vlan_list))
Linus Torvalds's avatar
Linus Torvalds committed
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
		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
417
 *
Linus Torvalds's avatar
Linus Torvalds committed
418
419
420
421
 * @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
422
423
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
			struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
424
{
425
	skb->dev = slave_dev;
Linus Torvalds's avatar
Linus Torvalds committed
426
	skb->priority = 1;
427
428
429
430
431
#ifdef CONFIG_NET_POLL_CONTROLLER
	if (unlikely(bond->dev->priv_flags & IFF_IN_NETPOLL)) {
		struct netpoll *np = bond->dev->npinfo->netpoll;
		slave_dev->npinfo = bond->dev->npinfo;
		slave_dev->priv_flags |= IFF_IN_NETPOLL;
432
		netpoll_send_skb_on_dev(np, skb, slave_dev);
433
434
435
436
		slave_dev->priv_flags &= ~IFF_IN_NETPOLL;
	} else
#endif
		dev_queue_xmit(skb);
Linus Torvalds's avatar
Linus Torvalds committed
437
438
439
440
441
442
443
444
445
446
447
448

	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
449
 *
Linus Torvalds's avatar
Linus Torvalds committed
450
451
452
453
454
455
456
457
458
459
460
461
462
463
 * 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
464
465
static void bond_vlan_rx_register(struct net_device *bond_dev,
				  struct vlan_group *grp)
Linus Torvalds's avatar
Linus Torvalds committed
466
{
467
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
468
469
470
	struct slave *slave;
	int i;

471
	write_lock_bh(&bond->lock);
Linus Torvalds's avatar
Linus Torvalds committed
472
	bond->vlgrp = grp;
473
	write_unlock_bh(&bond->lock);
Linus Torvalds's avatar
Linus Torvalds committed
474
475
476

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
477
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
478
479

		if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
480
481
		    slave_ops->ndo_vlan_rx_register) {
			slave_ops->ndo_vlan_rx_register(slave_dev, grp);
Linus Torvalds's avatar
Linus Torvalds committed
482
483
484
485
486
487
488
489
490
491
492
		}
	}
}

/**
 * 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)
{
493
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
494
495
496
497
498
	struct slave *slave;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
499
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
500
501

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
502
503
		    slave_ops->ndo_vlan_rx_add_vid) {
			slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
Linus Torvalds's avatar
Linus Torvalds committed
504
505
506
507
508
		}
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
509
		pr_err("%s: Error: Failed to add vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
510
511
512
513
514
515
516
517
518
519
520
		       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)
{
521
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
522
523
524
525
526
527
	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;
528
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
529
530

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
531
		    slave_ops->ndo_vlan_rx_kill_vid) {
Linus Torvalds's avatar
Linus Torvalds committed
532
533
534
			/* Save and then restore vlan_dev in the grp array,
			 * since the slave's driver might clear it.
			 */
535
			vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
536
			slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
537
			vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
538
539
540
541
542
		}
	}

	res = bond_del_vlan(bond, vid);
	if (res) {
543
		pr_err("%s: Error: Failed to remove vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
544
545
546
547
548
549
550
		       bond_dev->name, vid);
	}
}

static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;
551
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
552

553
	if (!bond->vlgrp)
554
		return;
Linus Torvalds's avatar
Linus Torvalds committed
555
556

	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
557
558
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
Linus Torvalds's avatar
Linus Torvalds committed
559
560

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
561
	    !(slave_ops->ndo_vlan_rx_add_vid))
562
		return;
Linus Torvalds's avatar
Linus Torvalds committed
563

564
565
	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
566
567
}

Stephen Hemminger's avatar
Stephen Hemminger committed
568
569
static void bond_del_vlans_from_slave(struct bonding *bond,
				      struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
570
{
571
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
572
573
574
	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

575
	if (!bond->vlgrp)
576
		return;
Linus Torvalds's avatar
Linus Torvalds committed
577
578

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
579
	    !(slave_ops->ndo_vlan_rx_kill_vid))
Linus Torvalds's avatar
Linus Torvalds committed
580
581
582
		goto unreg;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
583
584
		if (!vlan->vlan_id)
			continue;
Linus Torvalds's avatar
Linus Torvalds committed
585
586
587
		/* Save and then restore vlan_dev in the grp array,
		 * since the slave's driver might clear it.
		 */
588
		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
589
		slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
590
		vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
591
592
593
594
	}

unreg:
	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
595
596
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
597
598
599
600
}

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

601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
/*
 * 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
637
638
639
640
641
642
643
644
645
646
/*
 * Get link speed and duplex from the slave's base driver
 * using ethtool. If for some reason the call fails or the
 * values are invalid, fake speed and duplex to 100/Full
 * and return error.
 */
static int bond_update_speed_duplex(struct slave *slave)
{
	struct net_device *slave_dev = slave->dev;
	struct ethtool_cmd etool;
647
	int res;
Linus Torvalds's avatar
Linus Torvalds committed
648
649
650
651
652

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

653
654
	if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
		return -1;
Linus Torvalds's avatar
Linus Torvalds committed
655

656
657
	res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
	if (res < 0)
Linus Torvalds's avatar
Linus Torvalds committed
658
659
660
661
662
663
		return -1;

	switch (etool.speed) {
	case SPEED_10:
	case SPEED_100:
	case SPEED_1000:
664
	case SPEED_10000:
Linus Torvalds's avatar
Linus Torvalds committed
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
		break;
	default:
		return -1;
	}

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

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

	return 0;
}

/*
 * if <dev> supports MII link status reporting, check its link status.
 *
 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
Stephen Hemminger's avatar
Stephen Hemminger committed
688
 * depending upon the setting of the use_carrier parameter.
Linus Torvalds's avatar
Linus Torvalds committed
689
690
691
692
693
694
695
696
697
698
699
 *
 * 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
700
701
static int bond_check_dev_link(struct bonding *bond,
			       struct net_device *slave_dev, int reporting)
Linus Torvalds's avatar
Linus Torvalds committed
702
{
703
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
704
	int (*ioctl)(struct net_device *, struct ifreq *, int);
Linus Torvalds's avatar
Linus Torvalds committed
705
706
707
	struct ifreq ifr;
	struct mii_ioctl_data *mii;

708
709
710
	if (!reporting && !netif_running(slave_dev))
		return 0;

711
	if (bond->params.use_carrier)
Linus Torvalds's avatar
Linus Torvalds committed
712
713
		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;

714
715
716
717
718
719
720
721
722
723
724
	/* 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
725
	/* Ethtool can't be used, fallback to MII ioctls. */
726
	ioctl = slave_ops->ndo_do_ioctl;
Linus Torvalds's avatar
Linus Torvalds committed
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
	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
745
746
			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
				return mii->val_out & BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
747
748
749
750
751
		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
752
	 * or both SIOCGMIIREG and get_link failed (meaning that we
Linus Torvalds's avatar
Linus Torvalds committed
753
754
755
	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
Stephen Hemminger's avatar
Stephen Hemminger committed
756
	return reporting ? -1 : BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
757
758
759
760
761
762
763
}

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

/*
 * Push the promiscuity flag down to appropriate slaves
 */
764
static int bond_set_promiscuity(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
765
{
766
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
767
768
769
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
770
771
			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
Linus Torvalds's avatar
Linus Torvalds committed
772
773
774
775
776
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
777
778
779
			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
780
781
		}
	}
782
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
783
784
785
786
787
}

/*
 * Push the allmulti flag down to all slaves
 */
788
static int bond_set_allmulti(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
789
{
790
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
791
792
793
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
794
795
			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
Linus Torvalds's avatar
Linus Torvalds committed
796
797
798
799
800
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
801
802
803
			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
804
805
		}
	}
806
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
807
808
809
810
811
812
}

/*
 * Add a Multicast address to slaves
 * according to mode
 */
813
static void bond_mc_add(struct bonding *bond, void *addr)
Linus Torvalds's avatar
Linus Torvalds committed
814
815
816
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
Stephen Hemminger's avatar
Stephen Hemminger committed
817
		if (bond->curr_active_slave)
818
			dev_mc_add(bond->curr_active_slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
819
820
821
	} else {
		struct slave *slave;
		int i;
Stephen Hemminger's avatar
Stephen Hemminger committed
822
823

		bond_for_each_slave(bond, slave, i)
824
			dev_mc_add(slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
825
826
827
828
829
830
831
	}
}

/*
 * Remove a multicast address from slave
 * according to mode
 */
832
static void bond_mc_del(struct bonding *bond, void *addr)
Linus Torvalds's avatar
Linus Torvalds committed
833
834
835
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
Stephen Hemminger's avatar
Stephen Hemminger committed
836
		if (bond->curr_active_slave)
837
			dev_mc_del(bond->curr_active_slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
838
839
840
841
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
842
			dev_mc_del(slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
843
844
845
846
		}
	}
}

847

848
static void __bond_resend_igmp_join_requests(struct net_device *dev)
849
850
851
852
{
	struct in_device *in_dev;

	rcu_read_lock();
853
	in_dev = __in_dev_get_rcu(dev);
Eric Dumazet's avatar
Eric Dumazet committed
854
	if (in_dev)
855
		ip_mc_rejoin_groups(in_dev);
856
857
858
	rcu_read_unlock();
}

859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
/*
 * Retrieve the list of registered multicast addresses for the bonding
 * device and retransmit an IGMP JOIN request to the current active
 * slave.
 */
static void bond_resend_igmp_join_requests(struct bonding *bond)
{
	struct 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);
		}
	}

884
885
886
	if (--bond->igmp_retrans > 0)
		queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);

887
888
889
	read_unlock(&bond->lock);
}

890
static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
891
892
893
894
895
896
{
	struct bonding *bond = container_of(work, struct bonding,
							mcast_work.work);
	bond_resend_igmp_join_requests(bond);
}

Linus Torvalds's avatar
Linus Torvalds committed
897
898
899
/*
 * flush all members of flush->mc_list from device dev->mc_list
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
900
901
static void bond_mc_list_flush(struct net_device *bond_dev,
			       struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
902
{
903
	struct bonding *bond = netdev_priv(bond_dev);
904
	struct netdev_hw_addr *ha;
Linus Torvalds's avatar
Linus Torvalds committed
905

906
907
	netdev_for_each_mc_addr(ha, bond_dev)
		dev_mc_del(slave_dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
908
909
910
911
912

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

913
		dev_mc_del(slave_dev, lacpdu_multicast);
Linus Torvalds's avatar
Linus Torvalds committed
914
915
916
917
918
919
920
921
922
923
	}
}

/*--------------------------- 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
924
925
static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
			 struct slave *old_active)
Linus Torvalds's avatar
Linus Torvalds committed
926
{
927
	struct netdev_hw_addr *ha;
Linus Torvalds's avatar
Linus Torvalds committed
928

Stephen Hemminger's avatar
Stephen Hemminger committed
929
	if (!USES_PRIMARY(bond->params.mode))
Linus Torvalds's avatar
Linus Torvalds committed
930
931
932
933
934
935
		/* nothing to do -  mc list is already up-to-date on
		 * all slaves
		 */
		return;

	if (old_active) {
Stephen Hemminger's avatar
Stephen Hemminger committed
936
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
937
938
			dev_set_promiscuity(old_active->dev, -1);

Stephen Hemminger's avatar
Stephen Hemminger committed
939
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
940
941
			dev_set_allmulti(old_active->dev, -1);

942
943
		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_del(old_active->dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
944
945
946
	}

	if (new_active) {
947
		/* FIXME: Signal errors upstream. */
Stephen Hemminger's avatar
Stephen Hemminger committed
948
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
949
950
			dev_set_promiscuity(new_active->dev, 1);

Stephen Hemminger's avatar
Stephen Hemminger committed
951
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
952
953
			dev_set_allmulti(new_active->dev, 1);

954
955
		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_add(new_active->dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
956
957
958
	}
}

959
960
961
962
963
964
965
966
967
968
/*
 * 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)
969
970
971
972
	__releases(&bond->curr_slave_lock)
	__releases(&bond->lock)
	__acquires(&bond->lock)
	__acquires(&bond->curr_slave_lock)
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
{
	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) {
1008
			pr_err("%s: Error %d setting MAC of slave %s\n",
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
			       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)
1021
			pr_err("%s: Error %d setting MAC of slave %s\n",
1022
1023
1024
1025
1026
1027
			       bond->dev->name, -rv, new_active->dev->name);
out:
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);
		break;
	default:
1028
		pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1029
1030
1031
1032
1033
1034
		       bond->dev->name, bond->params.fail_over_mac);
		break;
	}

}

1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
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;
}
1054

Linus Torvalds's avatar
Linus Torvalds committed
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
/**
 * 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;

1068
	new_active = bond->curr_active_slave;
Linus Torvalds's avatar
Linus Torvalds committed
1069
1070

	if (!new_active) { /* there were no active slaves left */
Stephen Hemminger's avatar
Stephen Hemminger committed
1071
		if (bond->slave_cnt > 0)   /* found one slave */
Linus Torvalds's avatar
Linus Torvalds committed
1072
			new_active = bond->first_slave;
Stephen Hemminger's avatar
Stephen Hemminger committed
1073
		else
Linus Torvalds's avatar
Linus Torvalds committed
1074
1075
1076
1077
			return NULL; /* still no slave, return NULL */
	}

	if ((bond->primary_slave) &&
1078
1079
	    bond->primary_slave->link == BOND_LINK_UP &&
	    bond_should_change_active(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1080
1081
1082
1083
1084
1085
1086
		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) {
1087
1088
1089
1090
1091
1092
1093
1094
		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
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
			}
		}
	}

	return bestslave;
}

/**
 * change_active_interface - change the active slave into the specified one
 * @bond: our bonding struct
 * @new: the new slave to make the active one
 *
 * Set the new slave to the bond's settings and unset them on the old
 * curr_active_slave.
 * Setting include flags, mc-list, promiscuity, allmulti, etc.
 *
 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 * because it is apparently the best available slave we have, even though its
 * updelay hasn't timed out yet.
 *
1115
1116
 * 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
1117
 */
1118
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1119
1120
1121
{
	struct slave *old_active = bond->curr_active_slave;

Stephen Hemminger's avatar
Stephen Hemminger committed
1122
	if (old_active == new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1123
1124
1125
		return;

	if (new_active) {
1126
1127
		new_active->jiffies = jiffies;

Linus Torvalds's avatar
Linus Torvalds committed
1128
1129
		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
1130
1131
1132
				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
1133
1134
1135
1136
1137
			}

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

Stephen Hemminger's avatar
Stephen Hemminger committed
1138
			if (bond->params.mode == BOND_MODE_8023AD)
Linus Torvalds's avatar
Linus Torvalds committed
1139
1140
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);

1141
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
1142
1143
1144
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
1145
1146
				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
1147
1148
1149
1150
			}
		}
	}

Stephen Hemminger's avatar
Stephen Hemminger committed
1151
	if (USES_PRIMARY(bond->params.mode))
Linus Torvalds's avatar
Linus Torvalds committed
1152
1153
		bond_mc_swap(bond, new_active, old_active);

1154
	if (bond_is_lb(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1155
		bond_alb_handle_active_change(bond, new_active);
1156
1157
1158
1159
		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
1160
1161
1162
	} else {
		bond->curr_active_slave = new_active;
	}
Jay Vosburgh's avatar
Jay Vosburgh committed
1163
1164

	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
Stephen Hemminger's avatar
Stephen Hemminger committed
1165
		if (old_active)
Jay Vosburgh's avatar
Jay Vosburgh committed
1166
1167
1168
1169
			bond_set_slave_inactive_flags(old_active);

		if (new_active) {
			bond_set_slave_active_flags(new_active);
1170

1171
1172
1173
			if (bond->params.fail_over_mac)
				bond_do_fail_over_mac(bond, new_active,
						      old_active);
1174

1175
1176
1177
			if (netif_running(bond->dev)) {
				bond->send_grat_arp = bond->params.num_grat_arp;
				bond_send_gratuitous_arp(bond);
1178

1179
1180
1181
				bond->send_unsol_na = bond->params.num_unsol_na;
				bond_send_unsolicited_na(bond);
			}
1182

1183
1184
1185
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);

1186
			netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1187
1188
1189

			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
1190
		}
Jay Vosburgh's avatar
Jay Vosburgh committed
1191
	}
1192

1193
1194
	/* resend IGMP joins since active slave has changed or
	 * all were sent on curr_active_slave */
1195
1196
1197
	if (((USES_PRIMARY(bond->params.mode) && new_active) ||
	     bond->params.mode == BOND_MODE_ROUNDROBIN) &&
	    netif_running(bond->dev)) {
1198
		bond->igmp_retrans = bond->params.resend_igmp;
1199
		queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1200
	}
Linus Torvalds's avatar
Linus Torvalds committed
1201
1202
1203
1204
1205
1206
}

/**
 * bond_select_active_slave - select a new active slave, if needed
 * @bond: our bonding struct
 *
Stephen Hemminger's avatar
Stephen Hemminger committed
1207
 * This functions should be called when one of the following occurs:
Linus Torvalds's avatar
Linus Torvalds committed
1208
1209
1210
1211
 * - 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.
 *
1212
 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1213
 */
1214
void bond_select_active_slave(struct bonding *bond)
Linus Torvalds's avatar
Linus Torvalds committed
1215
1216
{
	struct slave *best_slave;
1217
	int rv;
Linus Torvalds's avatar
Linus Torvalds committed
1218
1219
1220
1221

	best_slave = bond_find_best_slave(bond);
	if (best_slave != bond->curr_active_slave) {
		bond_change_active_slave(bond, best_slave);
1222
1223
1224
1225
1226
		rv = bond_set_carrier(bond);
		if (!rv)
			return;

		if (netif_carrier_ok(bond->dev)) {
1227
1228
			pr_info("%s: first active interface up!\n",
				bond->dev->name);
1229
		} else {
1230
1231
			pr_info("%s: now running without any active interface !\n",
				bond->dev->name);
1232
		}
Linus Torvalds's avatar
Linus Torvalds committed
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
	}
}

/*--------------------------- 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
1271
	if (slave->next)
Linus Torvalds's avatar
Linus Torvalds committed
1272
1273
		slave->next->prev = slave->prev;

Stephen Hemminger's avatar
Stephen Hemminger committed
1274
	if (slave->prev)
Linus Torvalds's avatar
Linus Torvalds committed
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
		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--;
}

1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * You must hold read lock on bond->lock before calling this.
 */
static bool slaves_support_netpoll(struct net_device *bond_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *slave;
	int i = 0;
	bool ret = true;

	bond_for_each_slave(bond, slave, i) {
		if ((slave->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
		    !slave->dev->netdev_ops->ndo_poll_controller)
			ret = false;
	}
	return i != 0 && ret;
}

static void bond_poll_controller(struct net_device *bond_dev)
{
1311
1312
1313
1314
1315
1316
1317
1318
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *slave;
	int i;

	bond_for_each_slave(bond, slave, i) {
		if (slave->dev && IS_UP(slave->dev))
			netpoll_poll_dev(slave->dev);
	}
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349