bond_main.c 135 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>
Jay Vosburgh's avatar
Jay Vosburgh committed
79
#include <net/route.h>
80
#include <net/net_namespace.h>
81
#include <net/netns/generic.h>
Linus Torvalds's avatar
Linus Torvalds committed
82
83
84
85
86
87
88
89
90
91
92
#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;
93
static int num_grat_arp = 1;
94
static int num_unsol_na = 1;
Linus Torvalds's avatar
Linus Torvalds committed
95
static int miimon	= BOND_LINK_MON_INTERV;
Stephen Hemminger's avatar
Stephen Hemminger committed
96
97
static int updelay;
static int downdelay;
Linus Torvalds's avatar
Linus Torvalds committed
98
static int use_carrier	= 1;
Stephen Hemminger's avatar
Stephen Hemminger committed
99
100
static char *mode;
static char *primary;
101
static char *primary_reselect;
Stephen Hemminger's avatar
Stephen Hemminger committed
102
103
104
static char *lacp_rate;
static char *ad_select;
static char *xmit_hash_policy;
Linus Torvalds's avatar
Linus Torvalds committed
105
static int arp_interval = BOND_LINK_ARP_INTERV;
Stephen Hemminger's avatar
Stephen Hemminger committed
106
107
108
static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *fail_over_mac;
109
static struct bond_params bonding_defaults;
Linus Torvalds's avatar
Linus Torvalds committed
110
111
112

module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
113
114
module_param(num_grat_arp, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
115
116
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
117
118
119
120
121
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);
122
123
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
			    "in milliseconds");
Linus Torvalds's avatar
Linus Torvalds committed
124
module_param(use_carrier, int, 0);
125
126
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
127
module_param(mode, charp, 0);
128
129
130
131
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
132
133
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
134
135
136
137
138
139
140
141
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
142
module_param(lacp_rate, charp, 0);
143
144
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
			    "(slow/fast)");
145
146
module_param(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
147
module_param(xmit_hash_policy, charp, 0);
148
149
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
150
151
152
153
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");
154
155
module_param(arp_validate, charp, 0);
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
156
157
module_param(fail_over_mac, charp, 0);
MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
Linus Torvalds's avatar
Linus Torvalds committed
158
159
160

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

161
static const char * const version =
Linus Torvalds's avatar
Linus Torvalds committed
162
163
	DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";

164
int bond_net_id __read_mostly;
Linus Torvalds's avatar
Linus Torvalds committed
165

Stephen Hemminger's avatar
Stephen Hemminger committed
166
167
static __be32 arp_target[BOND_MAX_ARP_TARGETS];
static int arp_ip_count;
Linus Torvalds's avatar
Linus Torvalds committed
168
static int bond_mode	= BOND_MODE_ROUNDROBIN;
Stephen Hemminger's avatar
Stephen Hemminger committed
169
170
static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;
171

Linus Torvalds's avatar
Linus Torvalds committed
172

173
const struct bond_parm_tbl bond_lacp_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
174
175
176
177
178
{	"slow",		AD_LACP_SLOW},
{	"fast",		AD_LACP_FAST},
{	NULL,		-1},
};

179
const struct bond_parm_tbl bond_mode_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
180
181
182
183
184
185
186
187
188
189
{	"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},
};

190
const struct bond_parm_tbl xmit_hashtype_tbl[] = {
191
192
{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
193
{	"layer2+3",		BOND_XMIT_POLICY_LAYER23},
194
195
196
{	NULL,			-1},
};

197
const struct bond_parm_tbl arp_validate_tbl[] = {
198
199
200
201
202
203
204
{	"none",			BOND_ARP_VALIDATE_NONE},
{	"active",		BOND_ARP_VALIDATE_ACTIVE},
{	"backup",		BOND_ARP_VALIDATE_BACKUP},
{	"all",			BOND_ARP_VALIDATE_ALL},
{	NULL,			-1},
};

205
const struct bond_parm_tbl fail_over_mac_tbl[] = {
206
207
208
209
210
211
{	"none",			BOND_FOM_NONE},
{	"active",		BOND_FOM_ACTIVE},
{	"follow",		BOND_FOM_FOLLOW},
{	NULL,			-1},
};

212
213
214
215
216
217
218
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},
};

219
220
221
222
223
224
225
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
226
227
/*-------------------------- Forward declarations ---------------------------*/

Jay Vosburgh's avatar
Jay Vosburgh committed
228
static void bond_send_gratuitous_arp(struct bonding *bond);
229
static int bond_init(struct net_device *bond_dev);
230
static void bond_uninit(struct net_device *bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
231
232
233

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

234
static const char *bond_mode_name(int mode)
Linus Torvalds's avatar
Linus Torvalds committed
235
{
236
237
238
239
240
	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
241
		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
242
243
244
245
246
		[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
247
		return "unknown";
248
249

	return names[mode];
Linus Torvalds's avatar
Linus Torvalds committed
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
}

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

265
	pr_debug("bond: %s, vlan id %d\n",
266
		 (bond ? bond->dev->name : "None"), vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
267

268
	vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
Stephen Hemminger's avatar
Stephen Hemminger committed
269
	if (!vlan)
Linus Torvalds's avatar
Linus Torvalds committed
270
271
272
273
274
275
276
277
278
279
280
		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);

281
	pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
282
283
284
285
286
287
288
289
290
291
292
293
294

	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)
{
295
	struct vlan_entry *vlan;
Linus Torvalds's avatar
Linus Torvalds committed
296
297
	int res = -ENODEV;

298
	pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
299
300
301

	write_lock_bh(&bond->lock);

302
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
Linus Torvalds's avatar
Linus Torvalds committed
303
304
305
		if (vlan->vlan_id == vlan_id) {
			list_del(&vlan->vlan_list);

306
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
307
308
				bond_alb_clear_vlan(bond, vlan_id);

309
310
			pr_debug("removed VLAN ID %d from bond %s\n",
				 vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328

			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;
		}
	}

329
330
	pr_debug("couldn't find VLAN ID %d in bond %s\n",
		 vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352

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

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

	bond_for_each_slave(bond, slave, i) {
		if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
353
			pr_debug("found VLAN challenged slave - %s\n",
354
				 slave->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
355
356
357
358
			return 1;
		}
	}

359
	pr_debug("no VLAN challenged slaves found\n");
Linus Torvalds's avatar
Linus Torvalds committed
360
361
362
363
364
365
366
367
368
369
	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
370
 *
Linus Torvalds's avatar
Linus Torvalds committed
371
372
373
374
375
376
 * 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
377
	if (list_empty(&bond->vlan_list))
Linus Torvalds's avatar
Linus Torvalds committed
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
		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
400
 *
Linus Torvalds's avatar
Linus Torvalds committed
401
402
403
 * @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
404
 *
Linus Torvalds's avatar
Linus Torvalds committed
405
406
407
408
409
410
411
 * When the bond gets an skb to transmit that is
 * already hardware accelerated VLAN tagged, and it
 * needs to relay this skb to a slave that is not
 * hw accel capable, the skb needs to be "unaccelerated",
 * i.e. strip the hwaccel tag and re-insert it as part
 * of the payload.
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
412
413
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
			struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
414
{
415
	unsigned short uninitialized_var(vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433

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

	skb->priority = 1;
434
435
436
437
438
439
440
441
442
443
444
445
#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;
		np->real_dev = np->dev = skb->dev;
		slave_dev->priv_flags |= IFF_IN_NETPOLL;
		netpoll_send_skb(np, skb);
		slave_dev->priv_flags &= ~IFF_IN_NETPOLL;
		np->dev = bond->dev;
	} else
#endif
		dev_queue_xmit(skb);
Linus Torvalds's avatar
Linus Torvalds committed
446
447
448
449
450
451
452
453
454
455
456
457

	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
458
 *
Linus Torvalds's avatar
Linus Torvalds committed
459
460
461
462
463
464
465
466
467
468
469
470
471
472
 * 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
473
474
static void bond_vlan_rx_register(struct net_device *bond_dev,
				  struct vlan_group *grp)
Linus Torvalds's avatar
Linus Torvalds committed
475
{
476
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
477
478
479
480
481
482
483
	struct slave *slave;
	int i;

	bond->vlgrp = grp;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
484
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
485
486

		if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
487
488
		    slave_ops->ndo_vlan_rx_register) {
			slave_ops->ndo_vlan_rx_register(slave_dev, grp);
Linus Torvalds's avatar
Linus Torvalds committed
489
490
491
492
493
494
495
496
497
498
499
		}
	}
}

/**
 * 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)
{
500
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
501
502
503
504
505
	struct slave *slave;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
506
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
507
508

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
509
510
		    slave_ops->ndo_vlan_rx_add_vid) {
			slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
Linus Torvalds's avatar
Linus Torvalds committed
511
512
513
514
515
		}
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
516
		pr_err("%s: Error: Failed to add vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
517
518
519
520
521
522
523
524
525
526
527
		       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)
{
528
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
529
530
531
532
533
534
	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;
535
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
536
537

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
538
		    slave_ops->ndo_vlan_rx_kill_vid) {
Linus Torvalds's avatar
Linus Torvalds committed
539
540
541
			/* Save and then restore vlan_dev in the grp array,
			 * since the slave's driver might clear it.
			 */
542
			vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
543
			slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
544
			vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
545
546
547
548
549
		}
	}

	res = bond_del_vlan(bond, vid);
	if (res) {
550
		pr_err("%s: Error: Failed to remove vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
551
552
553
554
555
556
557
		       bond_dev->name, vid);
	}
}

static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;
558
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
559
560
561

	write_lock_bh(&bond->lock);

562
	if (list_empty(&bond->vlan_list))
Linus Torvalds's avatar
Linus Torvalds committed
563
564
565
		goto out;

	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
566
567
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
Linus Torvalds's avatar
Linus Torvalds committed
568
569

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
570
	    !(slave_ops->ndo_vlan_rx_add_vid))
Linus Torvalds's avatar
Linus Torvalds committed
571
572
		goto out;

573
574
	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
575
576
577
578
579

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

Stephen Hemminger's avatar
Stephen Hemminger committed
580
581
static void bond_del_vlans_from_slave(struct bonding *bond,
				      struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
582
{
583
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
584
585
586
587
588
	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

	write_lock_bh(&bond->lock);

589
	if (list_empty(&bond->vlan_list))
Linus Torvalds's avatar
Linus Torvalds committed
590
591
592
		goto out;

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
593
	    !(slave_ops->ndo_vlan_rx_kill_vid))
Linus Torvalds's avatar
Linus Torvalds committed
594
595
596
597
598
599
		goto unreg;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		/* Save and then restore vlan_dev in the grp array,
		 * since the slave's driver might clear it.
		 */
600
		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
601
		slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
602
		vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
603
604
605
606
	}

unreg:
	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
607
608
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
609
610
611
612
613
614
615

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

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

616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
/*
 * 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
652
653
654
655
656
657
658
659
660
661
/*
 * 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;
662
	int res;
Linus Torvalds's avatar
Linus Torvalds committed
663
664
665
666
667

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

668
669
	if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
		return -1;
Linus Torvalds's avatar
Linus Torvalds committed
670

671
672
	res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
	if (res < 0)
Linus Torvalds's avatar
Linus Torvalds committed
673
674
675
676
677
678
		return -1;

	switch (etool.speed) {
	case SPEED_10:
	case SPEED_100:
	case SPEED_1000:
679
	case SPEED_10000:
Linus Torvalds's avatar
Linus Torvalds committed
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
		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
703
 * depending upon the setting of the use_carrier parameter.
Linus Torvalds's avatar
Linus Torvalds committed
704
705
706
707
708
709
710
711
712
713
714
 *
 * 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
715
716
static int bond_check_dev_link(struct bonding *bond,
			       struct net_device *slave_dev, int reporting)
Linus Torvalds's avatar
Linus Torvalds committed
717
{
718
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
719
	int (*ioctl)(struct net_device *, struct ifreq *, int);
Linus Torvalds's avatar
Linus Torvalds committed
720
721
722
	struct ifreq ifr;
	struct mii_ioctl_data *mii;

723
724
725
	if (!reporting && !netif_running(slave_dev))
		return 0;

726
	if (bond->params.use_carrier)
Linus Torvalds's avatar
Linus Torvalds committed
727
728
		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;

729
730
731
732
733
734
735
736
737
738
739
	/* 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
740
	/* Ethtool can't be used, fallback to MII ioctls. */
741
	ioctl = slave_ops->ndo_do_ioctl;
Linus Torvalds's avatar
Linus Torvalds committed
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
	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
760
761
			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
				return mii->val_out & BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
762
763
764
765
766
		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
767
	 * or both SIOCGMIIREG and get_link failed (meaning that we
Linus Torvalds's avatar
Linus Torvalds committed
768
769
770
	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
Stephen Hemminger's avatar
Stephen Hemminger committed
771
	return reporting ? -1 : BMSR_LSTATUS;
Linus Torvalds's avatar
Linus Torvalds committed
772
773
774
775
776
777
778
}

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

/*
 * Push the promiscuity flag down to appropriate slaves
 */
779
static int bond_set_promiscuity(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
780
{
781
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
782
783
784
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
785
786
			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
Linus Torvalds's avatar
Linus Torvalds committed
787
788
789
790
791
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
792
793
794
			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
795
796
		}
	}
797
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
798
799
800
801
802
}

/*
 * Push the allmulti flag down to all slaves
 */
803
static int bond_set_allmulti(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
804
{
805
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
806
807
808
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
809
810
			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
Linus Torvalds's avatar
Linus Torvalds committed
811
812
813
814
815
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
816
817
818
			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
819
820
		}
	}
821
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
822
823
824
825
826
827
}

/*
 * Add a Multicast address to slaves
 * according to mode
 */
828
static void bond_mc_add(struct bonding *bond, void *addr)
Linus Torvalds's avatar
Linus Torvalds committed
829
830
831
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
Stephen Hemminger's avatar
Stephen Hemminger committed
832
		if (bond->curr_active_slave)
833
			dev_mc_add(bond->curr_active_slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
834
835
836
	} else {
		struct slave *slave;
		int i;
Stephen Hemminger's avatar
Stephen Hemminger committed
837
838

		bond_for_each_slave(bond, slave, i)
839
			dev_mc_add(slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
840
841
842
843
844
845
846
	}
}

/*
 * Remove a multicast address from slave
 * according to mode
 */
847
static void bond_mc_del(struct bonding *bond, void *addr)
Linus Torvalds's avatar
Linus Torvalds committed
848
849
850
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
Stephen Hemminger's avatar
Stephen Hemminger committed
851
		if (bond->curr_active_slave)
852
			dev_mc_del(bond->curr_active_slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
853
854
855
856
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
857
			dev_mc_del(slave->dev, addr);
Linus Torvalds's avatar
Linus Torvalds committed
858
859
860
861
		}
	}
}

862
863
864
865
866
867
868
869
870
871
872
873
874
875

/*
 * Retrieve the list of registered multicast addresses for the bonding
 * device and retransmit an IGMP JOIN request to the current active
 * slave.
 */
static void bond_resend_igmp_join_requests(struct bonding *bond)
{
	struct in_device *in_dev;
	struct ip_mc_list *im;

	rcu_read_lock();
	in_dev = __in_dev_get_rcu(bond->dev);
	if (in_dev) {
Stephen Hemminger's avatar
Stephen Hemminger committed
876
		for (im = in_dev->mc_list; im; im = im->next)
877
878
879
880
881
882
			ip_mc_rejoin_group(im);
	}

	rcu_read_unlock();
}

Linus Torvalds's avatar
Linus Torvalds committed
883
884
885
/*
 * flush all members of flush->mc_list from device dev->mc_list
 */
Stephen Hemminger's avatar
Stephen Hemminger committed
886
887
static void bond_mc_list_flush(struct net_device *bond_dev,
			       struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
888
{
889
	struct bonding *bond = netdev_priv(bond_dev);
890
	struct netdev_hw_addr *ha;
Linus Torvalds's avatar
Linus Torvalds committed
891

892
893
	netdev_for_each_mc_addr(ha, bond_dev)
		dev_mc_del(slave_dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
894
895
896
897
898

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

899
		dev_mc_del(slave_dev, lacpdu_multicast);
Linus Torvalds's avatar
Linus Torvalds committed
900
901
902
903
904
905
906
907
908
909
	}
}

/*--------------------------- 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
910
911
static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
			 struct slave *old_active)
Linus Torvalds's avatar
Linus Torvalds committed
912
{
913
	struct netdev_hw_addr *ha;
Linus Torvalds's avatar
Linus Torvalds committed
914

Stephen Hemminger's avatar
Stephen Hemminger committed
915
	if (!USES_PRIMARY(bond->params.mode))
Linus Torvalds's avatar
Linus Torvalds committed
916
917
918
919
920
921
		/* nothing to do -  mc list is already up-to-date on
		 * all slaves
		 */
		return;

	if (old_active) {
Stephen Hemminger's avatar
Stephen Hemminger committed
922
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
923
924
			dev_set_promiscuity(old_active->dev, -1);

Stephen Hemminger's avatar
Stephen Hemminger committed
925
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
926
927
			dev_set_allmulti(old_active->dev, -1);

928
929
		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_del(old_active->dev, ha->addr);
Linus Torvalds's avatar
Linus Torvalds committed
930
931
932
	}

	if (new_active) {
933
		/* FIXME: Signal errors upstream. */
Stephen Hemminger's avatar
Stephen Hemminger committed
934
		if (bond->dev->flags & IFF_PROMISC)
Linus Torvalds's avatar
Linus Torvalds committed
935
936
			dev_set_promiscuity(new_active->dev, 1);

Stephen Hemminger's avatar
Stephen Hemminger committed
937
		if (bond->dev->flags & IFF_ALLMULTI)
Linus Torvalds's avatar
Linus Torvalds committed
938
939
			dev_set_allmulti(new_active->dev, 1);

940
941
		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_add(new_active->dev, ha->addr);
942
		bond_resend_igmp_join_requests(bond);
Linus Torvalds's avatar
Linus Torvalds committed
943
944
945
	}
}

946
947
948
949
950
951
952
953
954
955
/*
 * 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)
956
957
958
959
	__releases(&bond->curr_slave_lock)
	__releases(&bond->lock)
	__acquires(&bond->lock)
	__acquires(&bond->curr_slave_lock)
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
{
	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) {
995
			pr_err("%s: Error %d setting MAC of slave %s\n",
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
			       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)
1008
			pr_err("%s: Error %d setting MAC of slave %s\n",
1009
1010
1011
1012
1013
1014
			       bond->dev->name, -rv, new_active->dev->name);
out:
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);
		break;
	default:
1015
		pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1016
1017
1018
1019
1020
1021
		       bond->dev->name, bond->params.fail_over_mac);
		break;
	}

}

1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
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;
}
1041

Linus Torvalds's avatar
Linus Torvalds committed
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
/**
 * 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;

1055
	new_active = bond->curr_active_slave;
Linus Torvalds's avatar
Linus Torvalds committed
1056
1057

	if (!new_active) { /* there were no active slaves left */
Stephen Hemminger's avatar
Stephen Hemminger committed
1058
		if (bond->slave_cnt > 0)   /* found one slave */
Linus Torvalds's avatar
Linus Torvalds committed
1059
			new_active = bond->first_slave;
Stephen Hemminger's avatar
Stephen Hemminger committed
1060
		else
Linus Torvalds's avatar
Linus Torvalds committed
1061
1062
1063
1064
			return NULL; /* still no slave, return NULL */
	}

	if ((bond->primary_slave) &&
1065
1066
	    bond->primary_slave->link == BOND_LINK_UP &&
	    bond_should_change_active(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1067
1068
1069
1070
1071
1072
1073
		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) {
1074
1075
1076
1077
1078
1079
1080
1081
		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
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
			}
		}
	}

	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.
 *
1102
1103
 * 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
1104
 */
1105
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1106
1107
1108
{
	struct slave *old_active = bond->curr_active_slave;

Stephen Hemminger's avatar
Stephen Hemminger committed
1109
	if (old_active == new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1110
1111
1112
		return;

	if (new_active) {
1113
1114
		new_active->jiffies = jiffies;

Linus Torvalds's avatar
Linus Torvalds committed
1115
1116
		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
1117
1118
1119
				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
1120
1121
1122
1123
1124
			}

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

Stephen Hemminger's avatar
Stephen Hemminger committed
1125
			if (bond->params.mode == BOND_MODE_8023AD)
Linus Torvalds's avatar
Linus Torvalds committed
1126
1127
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);

1128
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
1129
1130
1131
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
1132
1133
				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
1134
1135
1136
1137
			}
		}
	}

Stephen Hemminger's avatar
Stephen Hemminger committed
1138
	if (USES_PRIMARY(bond->params.mode))
Linus Torvalds's avatar
Linus Torvalds committed
1139
1140
		bond_mc_swap(bond, new_active, old_active);

1141
	if (bond_is_lb(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1142
		bond_alb_handle_active_change(bond, new_active);
1143
1144
1145
1146
		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
1147
1148
1149
	} else {
		bond->curr_active_slave = new_active;
	}
Jay Vosburgh's avatar
Jay Vosburgh committed
1150
1151

	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
Stephen Hemminger's avatar
Stephen Hemminger committed
1152
		if (old_active)
Jay Vosburgh's avatar
Jay Vosburgh committed
1153
1154
1155
1156
			bond_set_slave_inactive_flags(old_active);

		if (new_active) {
			bond_set_slave_active_flags(new_active);
1157

1158
1159
1160
			if (bond->params.fail_over_mac)
				bond_do_fail_over_mac(bond, new_active,
						      old_active);
1161

1162
			bond->send_grat_arp = bond->params.num_grat_arp;
1163
			bond_send_gratuitous_arp(bond);
1164

1165
1166
1167
			bond->send_unsol_na = bond->params.num_unsol_na;
			bond_send_unsolicited_na(bond);

1168
1169
1170
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);

1171
			netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1172
1173
1174

			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
1175
		}
Jay Vosburgh's avatar
Jay Vosburgh committed
1176
	}
1177
1178
1179
1180
1181

	/* resend IGMP joins since all were sent on curr_active_slave */
	if (bond->params.mode == BOND_MODE_ROUNDROBIN) {
		bond_resend_igmp_join_requests(bond);
	}
Linus Torvalds's avatar
Linus Torvalds committed
1182
1183
1184
1185
1186
1187
}

/**
 * bond_select_active_slave - select a new active slave, if needed
 * @bond: our bonding struct
 *
Stephen Hemminger's avatar
Stephen Hemminger committed
1188
 * This functions should be called when one of the following occurs:
Linus Torvalds's avatar
Linus Torvalds committed
1189
1190
1191
1192
 * - The old curr_active_slave has been released or lost its link.
 * - The primary_slave has got its link back.
 * - A slave has got its link back and there's no old curr_active_slave.
 *
1193
 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1194
 */
1195
void bond_select_active_slave(struct bonding *bond)
Linus Torvalds's avatar
Linus Torvalds committed
1196
1197
{
	struct slave *best_slave;
1198
	int rv;
Linus Torvalds's avatar
Linus Torvalds committed
1199
1200
1201
1202

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

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

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

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

	bond->slave_cnt++;
}

/*
 * This function detaches the slave from the list.
 * WARNING: no check is made to verify if the slave effectively
 * belongs to <bond>.
 * Nothing is freed on return, structures are just unchained.
 * If any slave pointer in bond was pointing to <slave>,
 * it should be changed by the calling function.
 *
 * bond->lock held for writing by caller.
 */
static void bond_detach_slave(struct bonding *bond, struct slave *slave)
{
Stephen Hemminger's avatar
Stephen Hemminger committed
1252
	if (slave->next)
Linus Torvalds's avatar
Linus Torvalds committed
1253
1254
		slave->next->prev = slave->prev;

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

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

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

1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
#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)
{
	struct net_device *dev = bond_dev->npinfo->netpoll->real_dev;
	if (dev != bond_dev)
		netpoll_poll_dev(dev);
}

static void bond_netpoll_cleanup(struct net_device *bond_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *slave;
	const struct net_device_ops *ops;
	int i;

	read_lock(&bond->lock);
	bond_dev->npinfo = NULL;
	bond_for_each_slave(bond, slave, i) {
		if (slave->dev) {
			ops = slave->dev->netdev_ops;
			if (ops->ndo_netpoll_cleanup)
				ops->ndo_netpoll_cleanup(slave->dev);
			else
				slave->dev->npinfo = NULL;
		}
	}
	read_unlock(&bond->lock);
}

#else

static void bond_netpoll_cleanup(struct net_device *bond_dev)
{
}

#endif

Linus Torvalds's avatar
Linus Torvalds committed
1326
1327
/*---------------------------------- IOCTL ----------------------------------*/

1328
1329
static int bond_sethwaddr(struct net_device *bond_dev,
			  struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
1330
{
1331
1332
1333
	pr_debug("bond_dev=%p\n", bond_dev);
	pr_debug("slave_dev=%p\n", slave_dev);
	pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
Linus Torvalds's avatar
Linus Torvalds committed
1334
1335
1336
1337
	memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
	return 0;
}

1338
1339
1340
#define BOND_VLAN_FEATURES \
	(NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
	 NETIF_F_HW_VLAN_FILTER)
1341

Stephen Hemminger's avatar
Stephen Hemminger committed
1342
/*
1343
 * Compute the common dev->feature set available to all slaves.  Some
1344
1345
 * feature bits are managed elsewhere, so preserve those feature bits
 * on the master device.
1346
1347
1348
1349
1350
 */
static int bond_compute_features(struct bonding *bond)
{
	struct slave *slave;
	struct net_device *bond_dev = bond->dev;
1351
	unsigned long features = bond_dev->features;
1352
	unsigned long vlan_features = 0;
1353
1354
	unsigned short max_hard_header_len = max((u16)ETH_HLEN,
						bond_dev->hard_header_len);
1355
	int i;
1356

1357
	features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1358
1359
1360
1361
1362
1363
	features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;

	if (!bond->first_slave)
		goto done;

	features &= ~NETIF_F_ONE_FOR_ALL;
1364

1365
	vlan_features = bond->first_slave->dev->vlan_features;
1366
	bond_for_each_slave(bond, slave, i) {
1367
1368
1369
		features = netdev_increment_features(features,
						     slave->dev->features,
						     NETIF_F_ONE_FOR_ALL);
1370
1371
1372
		vlan_features = netdev_increment_features(vlan_features,
							slave->dev->vlan_features,
							NETIF_F_ONE_FOR_ALL);
1373
1374
1375
		if (slave->dev->hard_header_len > max_hard_header_len)
			max_hard_header_len = slave->dev->hard_header_len;
	}
1376

1377
done:
1378
	features |= (bond_dev->features & BOND_VLAN_FEATURES);
1379
	bond_dev->features