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[net-next-2.6.git] / drivers / net / bonding / bond_main.c
CommitLineData
1da177e4
LT		 1/*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
1da177e4
LT		 32 */
33
34//#define BONDING_DEBUG 1
35
1da177e4
LT		 36#include <linux/kernel.h>
37#include <linux/module.h>
1da177e4
LT		 38#include <linux/types.h>
39#include <linux/fcntl.h>
40#include <linux/interrupt.h>
41#include <linux/ptrace.h>
42#include <linux/ioport.h>
43#include <linux/in.h>
169a3e66 44#include <net/ip.h>
1da177e4 45#include <linux/ip.h>
169a3e66
JV		 46#include <linux/tcp.h>
47#include <linux/udp.h>
1da177e4
LT		 48#include <linux/slab.h>
49#include <linux/string.h>
50#include <linux/init.h>
51#include <linux/timer.h>
52#include <linux/socket.h>
53#include <linux/ctype.h>
54#include <linux/inet.h>
55#include <linux/bitops.h>
56#include <asm/system.h>
57#include <asm/io.h>
58#include <asm/dma.h>
59#include <asm/uaccess.h>
60#include <linux/errno.h>
61#include <linux/netdevice.h>
62#include <linux/inetdevice.h>
a816c7c7 63#include <linux/igmp.h>
1da177e4
LT		 64#include <linux/etherdevice.h>
65#include <linux/skbuff.h>
66#include <net/sock.h>
67#include <linux/rtnetlink.h>
68#include <linux/proc_fs.h>
69#include <linux/seq_file.h>
70#include <linux/smp.h>
71#include <linux/if_ether.h>
72#include <net/arp.h>
73#include <linux/mii.h>
74#include <linux/ethtool.h>
75#include <linux/if_vlan.h>
76#include <linux/if_bonding.h>
c3ade5ca 77#include <net/route.h>
1da177e4
LT		 78#include "bonding.h"
79#include "bond_3ad.h"
80#include "bond_alb.h"
81
82/*---------------------------- Module parameters ----------------------------*/
83
84/* monitor all links that often (in milliseconds). <=0 disables monitoring */
85#define BOND_LINK_MON_INTERV 0
86#define BOND_LINK_ARP_INTERV 0
87
88static int max_bonds = BOND_DEFAULT_MAX_BONDS;
89static int miimon = BOND_LINK_MON_INTERV;
90static int updelay = 0;
91static int downdelay = 0;
92static int use_carrier = 1;
93static char *mode = NULL;
94static char *primary = NULL;
95static char *lacp_rate = NULL;
169a3e66 96static char *xmit_hash_policy = NULL;
1da177e4
LT		 97static int arp_interval = BOND_LINK_ARP_INTERV;
98static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
f5b2b966 99static char *arp_validate = NULL;
12479f9a 100struct bond_params bonding_defaults;
1da177e4
LT		 101
102module_param(max_bonds, int, 0);
103MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
104module_param(miimon, int, 0);
105MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
106module_param(updelay, int, 0);
107MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
108module_param(downdelay, int, 0);
2ac47660
MW		 109MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
110 "in milliseconds");
1da177e4 111module_param(use_carrier, int, 0);
2ac47660
MW		 112MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
113 "0 for off, 1 for on (default)");
1da177e4 114module_param(mode, charp, 0);
2ac47660
MW		 115MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
116 "1 for active-backup, 2 for balance-xor, "
117 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
118 "6 for balance-alb");
1da177e4
LT		 119module_param(primary, charp, 0);
120MODULE_PARM_DESC(primary, "Primary network device to use");
121module_param(lacp_rate, charp, 0);
2ac47660
MW		 122MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
123 "(slow/fast)");
169a3e66 124module_param(xmit_hash_policy, charp, 0);
2ac47660
MW		 125MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
126 ", 1 for layer 3+4");
1da177e4
LT		 127module_param(arp_interval, int, 0);
128MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
129module_param_array(arp_ip_target, charp, NULL, 0);
130MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
f5b2b966
JV		 131module_param(arp_validate, charp, 0);
132MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
1da177e4
LT		 133
134/*----------------------------- Global variables ----------------------------*/
135
f71e1309 136static const char * const version =
1da177e4
LT		 137 DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
138
12479f9a 139LIST_HEAD(bond_dev_list);
1da177e4
LT		 140
141#ifdef CONFIG_PROC_FS
142static struct proc_dir_entry *bond_proc_dir = NULL;
143#endif
144
b76cdba9 145extern struct rw_semaphore bonding_rwsem;
1da177e4
LT		 146static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
147static int arp_ip_count = 0;
1da177e4 148static int bond_mode = BOND_MODE_ROUNDROBIN;
169a3e66 149static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
1da177e4 150static int lacp_fast = 0;
217df670 151
1da177e4 152
12479f9a 153struct bond_parm_tbl bond_lacp_tbl[] = {
1da177e4
LT		 154{ "slow", AD_LACP_SLOW},
155{ "fast", AD_LACP_FAST},
156{ NULL, -1},
157};
158
12479f9a 159struct bond_parm_tbl bond_mode_tbl[] = {
1da177e4
LT		 160{ "balance-rr", BOND_MODE_ROUNDROBIN},
161{ "active-backup", BOND_MODE_ACTIVEBACKUP},
162{ "balance-xor", BOND_MODE_XOR},
163{ "broadcast", BOND_MODE_BROADCAST},
164{ "802.3ad", BOND_MODE_8023AD},
165{ "balance-tlb", BOND_MODE_TLB},
166{ "balance-alb", BOND_MODE_ALB},
167{ NULL, -1},
168};
169
12479f9a 170struct bond_parm_tbl xmit_hashtype_tbl[] = {
169a3e66
JV		 171{ "layer2", BOND_XMIT_POLICY_LAYER2},
172{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
173{ NULL, -1},
174};
175
f5b2b966
JV		 176struct bond_parm_tbl arp_validate_tbl[] = {
177{ "none", BOND_ARP_VALIDATE_NONE},
178{ "active", BOND_ARP_VALIDATE_ACTIVE},
179{ "backup", BOND_ARP_VALIDATE_BACKUP},
180{ "all", BOND_ARP_VALIDATE_ALL},
181{ NULL, -1},
182};
183
1da177e4
LT		 184/*-------------------------- Forward declarations ---------------------------*/
185
c3ade5ca 186static void bond_send_gratuitous_arp(struct bonding *bond);
1da177e4
LT		 187
188/*---------------------------- General routines -----------------------------*/
189
4ad072c9 190static const char *bond_mode_name(int mode)
1da177e4
LT		 191{
192 switch (mode) {
193 case BOND_MODE_ROUNDROBIN :
194 return "load balancing (round-robin)";
195 case BOND_MODE_ACTIVEBACKUP :
196 return "fault-tolerance (active-backup)";
197 case BOND_MODE_XOR :
198 return "load balancing (xor)";
199 case BOND_MODE_BROADCAST :
200 return "fault-tolerance (broadcast)";
201 case BOND_MODE_8023AD:
202 return "IEEE 802.3ad Dynamic link aggregation";
203 case BOND_MODE_TLB:
204 return "transmit load balancing";
205 case BOND_MODE_ALB:
206 return "adaptive load balancing";
207 default:
208 return "unknown";
209 }
210}
211
212/*---------------------------------- VLAN -----------------------------------*/
213
214/**
215 * bond_add_vlan - add a new vlan id on bond
216 * @bond: bond that got the notification
217 * @vlan_id: the vlan id to add
218 *
219 * Returns -ENOMEM if allocation failed.
220 */
221static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
222{
223 struct vlan_entry *vlan;
224
225 dprintk("bond: %s, vlan id %d\n",
226 (bond ? bond->dev->name: "None"), vlan_id);
227
228 vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
229 if (!vlan) {
230 return -ENOMEM;
231 }
232
233 INIT_LIST_HEAD(&vlan->vlan_list);
234 vlan->vlan_id = vlan_id;
c3ade5ca 235 vlan->vlan_ip = 0;
1da177e4
LT		 236
237 write_lock_bh(&bond->lock);
238
239 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
240
241 write_unlock_bh(&bond->lock);
242
243 dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
244
245 return 0;
246}
247
248/**
249 * bond_del_vlan - delete a vlan id from bond
250 * @bond: bond that got the notification
251 * @vlan_id: the vlan id to delete
252 *
253 * returns -ENODEV if @vlan_id was not found in @bond.
254 */
255static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
256{
257 struct vlan_entry *vlan, *next;
258 int res = -ENODEV;
259
260 dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
261
262 write_lock_bh(&bond->lock);
263
264 list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
265 if (vlan->vlan_id == vlan_id) {
266 list_del(&vlan->vlan_list);
267
268 if ((bond->params.mode == BOND_MODE_TLB) ||
269 (bond->params.mode == BOND_MODE_ALB)) {
270 bond_alb_clear_vlan(bond, vlan_id);
271 }
272
273 dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
274 bond->dev->name);
275
276 kfree(vlan);
277
278 if (list_empty(&bond->vlan_list) &&
279 (bond->slave_cnt == 0)) {
280 /* Last VLAN removed and no slaves, so
281 * restore block on adding VLANs. This will
282 * be removed once new slaves that are not
283 * VLAN challenged will be added.
284 */
285 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
286 }
287
288 res = 0;
289 goto out;
290 }
291 }
292
293 dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
294 bond->dev->name);
295
296out:
297 write_unlock_bh(&bond->lock);
298 return res;
299}
300
301/**
302 * bond_has_challenged_slaves
303 * @bond: the bond we're working on
304 *
305 * Searches the slave list. Returns 1 if a vlan challenged slave
306 * was found, 0 otherwise.
307 *
308 * Assumes bond->lock is held.
309 */
310static int bond_has_challenged_slaves(struct bonding *bond)
311{
312 struct slave *slave;
313 int i;
314
315 bond_for_each_slave(bond, slave, i) {
316 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
317 dprintk("found VLAN challenged slave - %s\n",
318 slave->dev->name);
319 return 1;
320 }
321 }
322
323 dprintk("no VLAN challenged slaves found\n");
324 return 0;
325}
326
327/**
328 * bond_next_vlan - safely skip to the next item in the vlans list.
329 * @bond: the bond we're working on
330 * @curr: item we're advancing from
331 *
332 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
333 * or @curr->next otherwise (even if it is @curr itself again).
334 *
335 * Caller must hold bond->lock
336 */
337struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
338{
339 struct vlan_entry *next, *last;
340
341 if (list_empty(&bond->vlan_list)) {
342 return NULL;
343 }
344
345 if (!curr) {
346 next = list_entry(bond->vlan_list.next,
347 struct vlan_entry, vlan_list);
348 } else {
349 last = list_entry(bond->vlan_list.prev,
350 struct vlan_entry, vlan_list);
351 if (last == curr) {
352 next = list_entry(bond->vlan_list.next,
353 struct vlan_entry, vlan_list);
354 } else {
355 next = list_entry(curr->vlan_list.next,
356 struct vlan_entry, vlan_list);
357 }
358 }
359
360 return next;
361}
362
363/**
364 * bond_dev_queue_xmit - Prepare skb for xmit.
365 *
366 * @bond: bond device that got this skb for tx.
367 * @skb: hw accel VLAN tagged skb to transmit
368 * @slave_dev: slave that is supposed to xmit this skbuff
369 *
370 * When the bond gets an skb to transmit that is
371 * already hardware accelerated VLAN tagged, and it
372 * needs to relay this skb to a slave that is not
373 * hw accel capable, the skb needs to be "unaccelerated",
374 * i.e. strip the hwaccel tag and re-insert it as part
375 * of the payload.
376 */
377int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
378{
379 unsigned short vlan_id;
380
381 if (!list_empty(&bond->vlan_list) &&
382 !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
383 vlan_get_tag(skb, &vlan_id) == 0) {
384 skb->dev = slave_dev;
385 skb = vlan_put_tag(skb, vlan_id);
386 if (!skb) {
387 /* vlan_put_tag() frees the skb in case of error,
388 * so return success here so the calling functions
389 * won't attempt to free is again.
390 */
391 return 0;
392 }
393 } else {
394 skb->dev = slave_dev;
395 }
396
397 skb->priority = 1;
398 dev_queue_xmit(skb);
399
400 return 0;
401}
402
403/*
404 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
405 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
406 * lock because:
407 * a. This operation is performed in IOCTL context,
408 * b. The operation is protected by the RTNL semaphore in the 8021q code,
409 * c. Holding a lock with BH disabled while directly calling a base driver
410 * entry point is generally a BAD idea.
411 *
412 * The design of synchronization/protection for this operation in the 8021q
413 * module is good for one or more VLAN devices over a single physical device
414 * and cannot be extended for a teaming solution like bonding, so there is a
415 * potential race condition here where a net device from the vlan group might
416 * be referenced (either by a base driver or the 8021q code) while it is being
417 * removed from the system. However, it turns out we're not making matters
418 * worse, and if it works for regular VLAN usage it will work here too.
419*/
420
421/**
422 * bond_vlan_rx_register - Propagates registration to slaves
423 * @bond_dev: bonding net device that got called
424 * @grp: vlan group being registered
425 */
426static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
427{
428 struct bonding *bond = bond_dev->priv;
429 struct slave *slave;
430 int i;
431
432 bond->vlgrp = grp;
433
434 bond_for_each_slave(bond, slave, i) {
435 struct net_device *slave_dev = slave->dev;
436
437 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
438 slave_dev->vlan_rx_register) {
439 slave_dev->vlan_rx_register(slave_dev, grp);
440 }
441 }
442}
443
444/**
445 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
446 * @bond_dev: bonding net device that got called
447 * @vid: vlan id being added
448 */
449static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
450{
451 struct bonding *bond = bond_dev->priv;
452 struct slave *slave;
453 int i, res;
454
455 bond_for_each_slave(bond, slave, i) {
456 struct net_device *slave_dev = slave->dev;
457
458 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
459 slave_dev->vlan_rx_add_vid) {
460 slave_dev->vlan_rx_add_vid(slave_dev, vid);
461 }
462 }
463
464 res = bond_add_vlan(bond, vid);
465 if (res) {
466 printk(KERN_ERR DRV_NAME
4e0952c7 467 ": %s: Error: Failed to add vlan id %d\n",
1da177e4
LT		 468 bond_dev->name, vid);
469 }
470}
471
472/**
473 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
474 * @bond_dev: bonding net device that got called
475 * @vid: vlan id being removed
476 */
477static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
478{
479 struct bonding *bond = bond_dev->priv;
480 struct slave *slave;
481 struct net_device *vlan_dev;
482 int i, res;
483
484 bond_for_each_slave(bond, slave, i) {
485 struct net_device *slave_dev = slave->dev;
486
487 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
488 slave_dev->vlan_rx_kill_vid) {
489 /* Save and then restore vlan_dev in the grp array,
490 * since the slave's driver might clear it.
491 */
5c15bdec 492 vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
1da177e4 493 slave_dev->vlan_rx_kill_vid(slave_dev, vid);
5c15bdec 494 vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
1da177e4
LT		 495 }
496 }
497
498 res = bond_del_vlan(bond, vid);
499 if (res) {
500 printk(KERN_ERR DRV_NAME
4e0952c7 501 ": %s: Error: Failed to remove vlan id %d\n",
1da177e4
LT		 502 bond_dev->name, vid);
503 }
504}
505
506static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
507{
508 struct vlan_entry *vlan;
509
510 write_lock_bh(&bond->lock);
511
512 if (list_empty(&bond->vlan_list)) {
513 goto out;
514 }
515
516 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
517 slave_dev->vlan_rx_register) {
518 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
519 }
520
521 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
522 !(slave_dev->vlan_rx_add_vid)) {
523 goto out;
524 }
525
526 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
527 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
528 }
529
530out:
531 write_unlock_bh(&bond->lock);
532}
533
534static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
535{
536 struct vlan_entry *vlan;
537 struct net_device *vlan_dev;
538
539 write_lock_bh(&bond->lock);
540
541 if (list_empty(&bond->vlan_list)) {
542 goto out;
543 }
544
545 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
546 !(slave_dev->vlan_rx_kill_vid)) {
547 goto unreg;
548 }
549
550 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
551 /* Save and then restore vlan_dev in the grp array,
552 * since the slave's driver might clear it.
553 */
5c15bdec 554 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
1da177e4 555 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
5c15bdec 556 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
1da177e4
LT		 557 }
558
559unreg:
560 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
561 slave_dev->vlan_rx_register) {
562 slave_dev->vlan_rx_register(slave_dev, NULL);
563 }
564
565out:
566 write_unlock_bh(&bond->lock);
567}
568
569/*------------------------------- Link status -------------------------------*/
570
ff59c456
JV		 571/*
572 * Set the carrier state for the master according to the state of its
573 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
574 * do special 802.3ad magic.
575 *
576 * Returns zero if carrier state does not change, nonzero if it does.
577 */
578static int bond_set_carrier(struct bonding *bond)
579{
580 struct slave *slave;
581 int i;
582
583 if (bond->slave_cnt == 0)
584 goto down;
585
586 if (bond->params.mode == BOND_MODE_8023AD)
587 return bond_3ad_set_carrier(bond);
588
589 bond_for_each_slave(bond, slave, i) {
590 if (slave->link == BOND_LINK_UP) {
591 if (!netif_carrier_ok(bond->dev)) {
592 netif_carrier_on(bond->dev);
593 return 1;
594 }
595 return 0;
596 }
597 }
598
599down:
600 if (netif_carrier_ok(bond->dev)) {
601 netif_carrier_off(bond->dev);
602 return 1;
603 }
604 return 0;
605}
606
1da177e4
LT		 607/*
608 * Get link speed and duplex from the slave's base driver
609 * using ethtool. If for some reason the call fails or the
610 * values are invalid, fake speed and duplex to 100/Full
611 * and return error.
612 */
613static int bond_update_speed_duplex(struct slave *slave)
614{
615 struct net_device *slave_dev = slave->dev;
1da177e4 616 struct ethtool_cmd etool;
61a44b9c 617 int res;
1da177e4
LT		 618
619 /* Fake speed and duplex */
620 slave->speed = SPEED_100;
621 slave->duplex = DUPLEX_FULL;
622
61a44b9c
MW		 623 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
624 return -1;
1da177e4 625
61a44b9c
MW		 626 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
627 if (res < 0)
1da177e4 628 return -1;
1da177e4 629
1da177e4
LT		 630 switch (etool.speed) {
631 case SPEED_10:
632 case SPEED_100:
633 case SPEED_1000:
94dbffd5 634 case SPEED_10000:
1da177e4
LT		 635 break;
636 default:
637 return -1;
638 }
639
640 switch (etool.duplex) {
641 case DUPLEX_FULL:
642 case DUPLEX_HALF:
643 break;
644 default:
645 return -1;
646 }
647
648 slave->speed = etool.speed;
649 slave->duplex = etool.duplex;
650
651 return 0;
652}
653
654/*
655 * if <dev> supports MII link status reporting, check its link status.
656 *
657 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
658 * depening upon the setting of the use_carrier parameter.
659 *
660 * Return either BMSR_LSTATUS, meaning that the link is up (or we
661 * can't tell and just pretend it is), or 0, meaning that the link is
662 * down.
663 *
664 * If reporting is non-zero, instead of faking link up, return -1 if
665 * both ETHTOOL and MII ioctls fail (meaning the device does not
666 * support them). If use_carrier is set, return whatever it says.
667 * It'd be nice if there was a good way to tell if a driver supports
668 * netif_carrier, but there really isn't.
669 */
670static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
671{
672 static int (* ioctl)(struct net_device *, struct ifreq *, int);
673 struct ifreq ifr;
674 struct mii_ioctl_data *mii;
1da177e4
LT		 675
676 if (bond->params.use_carrier) {
677 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
678 }
679
680 ioctl = slave_dev->do_ioctl;
681 if (ioctl) {
682 /* TODO: set pointer to correct ioctl on a per team member */
683 /* bases to make this more efficient. that is, once */
684 /* we determine the correct ioctl, we will always */
685 /* call it and not the others for that team */
686 /* member. */
687
688 /*
689 * We cannot assume that SIOCGMIIPHY will also read a
690 * register; not all network drivers (e.g., e100)
691 * support that.
692 */
693
694 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
695 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
696 mii = if_mii(&ifr);
697 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
698 mii->reg_num = MII_BMSR;
699 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
700 return (mii->val_out & BMSR_LSTATUS);
701 }
702 }
703 }
704
61a44b9c
MW		 705 /*
706 * Some drivers cache ETHTOOL_GLINK for a period of time so we only
707 * attempt to get link status from it if the above MII ioctls fail.
708 */
1da177e4
LT		 709 if (slave_dev->ethtool_ops) {
710 if (slave_dev->ethtool_ops->get_link) {
711 u32 link;
712
713 link = slave_dev->ethtool_ops->get_link(slave_dev);
714
715 return link ? BMSR_LSTATUS : 0;
716 }
717 }
718
1da177e4
LT		 719 /*
720 * If reporting, report that either there's no dev->do_ioctl,
61a44b9c 721 * or both SIOCGMIIREG and get_link failed (meaning that we
1da177e4
LT		 722 * cannot report link status). If not reporting, pretend
723 * we're ok.
724 */
725 return (reporting ? -1 : BMSR_LSTATUS);
726}
727
728/*----------------------------- Multicast list ------------------------------*/
729
730/*
731 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
732 */
733static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
734{
735 return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
736 dmi1->dmi_addrlen == dmi2->dmi_addrlen;
737}
738
739/*
740 * returns dmi entry if found, NULL otherwise
741 */
742static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
743{
744 struct dev_mc_list *idmi;
745
746 for (idmi = mc_list; idmi; idmi = idmi->next) {
747 if (bond_is_dmi_same(dmi, idmi)) {
748 return idmi;
749 }
750 }
751
752 return NULL;
753}
754
755/*
756 * Push the promiscuity flag down to appropriate slaves
757 */
758static void bond_set_promiscuity(struct bonding *bond, int inc)
759{
760 if (USES_PRIMARY(bond->params.mode)) {
761 /* write lock already acquired */
762 if (bond->curr_active_slave) {
763 dev_set_promiscuity(bond->curr_active_slave->dev, inc);
764 }
765 } else {
766 struct slave *slave;
767 int i;
768 bond_for_each_slave(bond, slave, i) {
769 dev_set_promiscuity(slave->dev, inc);
770 }
771 }
772}
773
774/*
775 * Push the allmulti flag down to all slaves
776 */
777static void bond_set_allmulti(struct bonding *bond, int inc)
778{
779 if (USES_PRIMARY(bond->params.mode)) {
780 /* write lock already acquired */
781 if (bond->curr_active_slave) {
782 dev_set_allmulti(bond->curr_active_slave->dev, inc);
783 }
784 } else {
785 struct slave *slave;
786 int i;
787 bond_for_each_slave(bond, slave, i) {
788 dev_set_allmulti(slave->dev, inc);
789 }
790 }
791}
792
793/*
794 * Add a Multicast address to slaves
795 * according to mode
796 */
797static void bond_mc_add(struct bonding *bond, void *addr, int alen)
798{
799 if (USES_PRIMARY(bond->params.mode)) {
800 /* write lock already acquired */
801 if (bond->curr_active_slave) {
802 dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
803 }
804 } else {
805 struct slave *slave;
806 int i;
807 bond_for_each_slave(bond, slave, i) {
808 dev_mc_add(slave->dev, addr, alen, 0);
809 }
810 }
811}
812
813/*
814 * Remove a multicast address from slave
815 * according to mode
816 */
817static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
818{
819 if (USES_PRIMARY(bond->params.mode)) {
820 /* write lock already acquired */
821 if (bond->curr_active_slave) {
822 dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
823 }
824 } else {
825 struct slave *slave;
826 int i;
827 bond_for_each_slave(bond, slave, i) {
828 dev_mc_delete(slave->dev, addr, alen, 0);
829 }
830 }
831}
832
a816c7c7
JV		 833
834/*
835 * Retrieve the list of registered multicast addresses for the bonding
836 * device and retransmit an IGMP JOIN request to the current active
837 * slave.
838 */
839static void bond_resend_igmp_join_requests(struct bonding *bond)
840{
841 struct in_device *in_dev;
842 struct ip_mc_list *im;
843
844 rcu_read_lock();
845 in_dev = __in_dev_get_rcu(bond->dev);
846 if (in_dev) {
847 for (im = in_dev->mc_list; im; im = im->next) {
848 ip_mc_rejoin_group(im);
849 }
850 }
851
852 rcu_read_unlock();
853}
854
1da177e4
LT		 855/*
856 * Totally destroys the mc_list in bond
857 */
858static void bond_mc_list_destroy(struct bonding *bond)
859{
860 struct dev_mc_list *dmi;
861
862 dmi = bond->mc_list;
863 while (dmi) {
864 bond->mc_list = dmi->next;
865 kfree(dmi);
866 dmi = bond->mc_list;
867 }
a816c7c7 868 bond->mc_list = NULL;
1da177e4
LT		 869}
870
871/*
872 * Copy all the Multicast addresses from src to the bonding device dst
873 */
de54f390 874static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
dd0fc66f 875 gfp_t gfp_flag)
1da177e4
LT		 876{
877 struct dev_mc_list *dmi, *new_dmi;
878
879 for (dmi = mc_list; dmi; dmi = dmi->next) {
de54f390 880 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
1da177e4
LT		 881
882 if (!new_dmi) {
883 /* FIXME: Potential memory leak !!! */
884 return -ENOMEM;
885 }
886
887 new_dmi->next = bond->mc_list;
888 bond->mc_list = new_dmi;
889 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
890 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
891 new_dmi->dmi_users = dmi->dmi_users;
892 new_dmi->dmi_gusers = dmi->dmi_gusers;
893 }
894
895 return 0;
896}
897
898/*
899 * flush all members of flush->mc_list from device dev->mc_list
900 */
901static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
902{
903 struct bonding *bond = bond_dev->priv;
904 struct dev_mc_list *dmi;
905
906 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
907 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
908 }
909
910 if (bond->params.mode == BOND_MODE_8023AD) {
911 /* del lacpdu mc addr from mc list */
912 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
913
914 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
915 }
916}
917
918/*--------------------------- Active slave change ---------------------------*/
919
920/*
921 * Update the mc list and multicast-related flags for the new and
922 * old active slaves (if any) according to the multicast mode, and
923 * promiscuous flags unconditionally.
924 */
925static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
926{
927 struct dev_mc_list *dmi;
928
929 if (!USES_PRIMARY(bond->params.mode)) {
930 /* nothing to do - mc list is already up-to-date on
931 * all slaves
932 */
933 return;
934 }
935
936 if (old_active) {
937 if (bond->dev->flags & IFF_PROMISC) {
938 dev_set_promiscuity(old_active->dev, -1);
939 }
940
941 if (bond->dev->flags & IFF_ALLMULTI) {
942 dev_set_allmulti(old_active->dev, -1);
943 }
944
945 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
946 dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
947 }
948 }
949
950 if (new_active) {
951 if (bond->dev->flags & IFF_PROMISC) {
952 dev_set_promiscuity(new_active->dev, 1);
953 }
954
955 if (bond->dev->flags & IFF_ALLMULTI) {
956 dev_set_allmulti(new_active->dev, 1);
957 }
958
959 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
960 dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
961 }
a816c7c7 962 bond_resend_igmp_join_requests(bond);
1da177e4
LT		 963 }
964}
965
966/**
967 * find_best_interface - select the best available slave to be the active one
968 * @bond: our bonding struct
969 *
970 * Warning: Caller must hold curr_slave_lock for writing.
971 */
972static struct slave *bond_find_best_slave(struct bonding *bond)
973{
974 struct slave *new_active, *old_active;
975 struct slave *bestslave = NULL;
976 int mintime = bond->params.updelay;
977 int i;
978
979 new_active = old_active = bond->curr_active_slave;
980
981 if (!new_active) { /* there were no active slaves left */
982 if (bond->slave_cnt > 0) { /* found one slave */
983 new_active = bond->first_slave;
984 } else {
985 return NULL; /* still no slave, return NULL */
986 }
987 }
988
989 /* first try the primary link; if arping, a link must tx/rx traffic
990 * before it can be considered the curr_active_slave - also, we would skip
991 * slaves between the curr_active_slave and primary_slave that may be up
992 * and able to arp
993 */
994 if ((bond->primary_slave) &&
995 (!bond->params.arp_interval) &&
996 (IS_UP(bond->primary_slave->dev))) {
997 new_active = bond->primary_slave;
998 }
999
1000 /* remember where to stop iterating over the slaves */
1001 old_active = new_active;
1002
1003 bond_for_each_slave_from(bond, new_active, i, old_active) {
1004 if (IS_UP(new_active->dev)) {
1005 if (new_active->link == BOND_LINK_UP) {
1006 return new_active;
1007 } else if (new_active->link == BOND_LINK_BACK) {
1008 /* link up, but waiting for stabilization */
1009 if (new_active->delay < mintime) {
1010 mintime = new_active->delay;
1011 bestslave = new_active;
1012 }
1013 }
1014 }
1015 }
1016
1017 return bestslave;
1018}
1019
1020/**
1021 * change_active_interface - change the active slave into the specified one
1022 * @bond: our bonding struct
1023 * @new: the new slave to make the active one
1024 *
1025 * Set the new slave to the bond's settings and unset them on the old
1026 * curr_active_slave.
1027 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1028 *
1029 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1030 * because it is apparently the best available slave we have, even though its
1031 * updelay hasn't timed out yet.
1032 *
1033 * Warning: Caller must hold curr_slave_lock for writing.
1034 */
a77b5325 1035void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1da177e4
LT		 1036{
1037 struct slave *old_active = bond->curr_active_slave;
1038
1039 if (old_active == new_active) {
1040 return;
1041 }
1042
1043 if (new_active) {
1044 if (new_active->link == BOND_LINK_BACK) {
1045 if (USES_PRIMARY(bond->params.mode)) {
1046 printk(KERN_INFO DRV_NAME
1047 ": %s: making interface %s the new "
1048 "active one %d ms earlier.\n",
1049 bond->dev->name, new_active->dev->name,
1050 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1051 }
1052
1053 new_active->delay = 0;
1054 new_active->link = BOND_LINK_UP;
1055 new_active->jiffies = jiffies;
1056
1057 if (bond->params.mode == BOND_MODE_8023AD) {
1058 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1059 }
1060
1061 if ((bond->params.mode == BOND_MODE_TLB) ||
1062 (bond->params.mode == BOND_MODE_ALB)) {
1063 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1064 }
1065 } else {
1066 if (USES_PRIMARY(bond->params.mode)) {
1067 printk(KERN_INFO DRV_NAME
1068 ": %s: making interface %s the new "
1069 "active one.\n",
1070 bond->dev->name, new_active->dev->name);
1071 }
1072 }
1073 }
1074
1da177e4
LT		 1075 if (USES_PRIMARY(bond->params.mode)) {
1076 bond_mc_swap(bond, new_active, old_active);
1077 }
1078
1079 if ((bond->params.mode == BOND_MODE_TLB) ||
1080 (bond->params.mode == BOND_MODE_ALB)) {
1081 bond_alb_handle_active_change(bond, new_active);
8f903c70
JV		 1082 if (old_active)
1083 bond_set_slave_inactive_flags(old_active);
1084 if (new_active)
1085 bond_set_slave_active_flags(new_active);
1da177e4
LT		 1086 } else {
1087 bond->curr_active_slave = new_active;
1088 }
c3ade5ca
JV		 1089
1090 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1091 if (old_active) {
1092 bond_set_slave_inactive_flags(old_active);
1093 }
1094
1095 if (new_active) {
1096 bond_set_slave_active_flags(new_active);
1097 }
1098 bond_send_gratuitous_arp(bond);
1099 }
1da177e4
LT		 1100}
1101
1102/**
1103 * bond_select_active_slave - select a new active slave, if needed
1104 * @bond: our bonding struct
1105 *
1106 * This functions shoud be called when one of the following occurs:
1107 * - The old curr_active_slave has been released or lost its link.
1108 * - The primary_slave has got its link back.
1109 * - A slave has got its link back and there's no old curr_active_slave.
1110 *
1111 * Warning: Caller must hold curr_slave_lock for writing.
1112 */
a77b5325 1113void bond_select_active_slave(struct bonding *bond)
1da177e4
LT		 1114{
1115 struct slave *best_slave;
ff59c456 1116 int rv;
1da177e4
LT		 1117
1118 best_slave = bond_find_best_slave(bond);
1119 if (best_slave != bond->curr_active_slave) {
1120 bond_change_active_slave(bond, best_slave);
ff59c456
JV		 1121 rv = bond_set_carrier(bond);
1122 if (!rv)
1123 return;
1124
1125 if (netif_carrier_ok(bond->dev)) {
1126 printk(KERN_INFO DRV_NAME
1127 ": %s: first active interface up!\n",
1128 bond->dev->name);
1129 } else {
1130 printk(KERN_INFO DRV_NAME ": %s: "
1131 "now running without any active interface !\n",
1132 bond->dev->name);
1133 }
1da177e4
LT		 1134 }
1135}
1136
1137/*--------------------------- slave list handling ---------------------------*/
1138
1139/*
1140 * This function attaches the slave to the end of list.
1141 *
1142 * bond->lock held for writing by caller.
1143 */
1144static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1145{
1146 if (bond->first_slave == NULL) { /* attaching the first slave */
1147 new_slave->next = new_slave;
1148 new_slave->prev = new_slave;
1149 bond->first_slave = new_slave;
1150 } else {
1151 new_slave->next = bond->first_slave;
1152 new_slave->prev = bond->first_slave->prev;
1153 new_slave->next->prev = new_slave;
1154 new_slave->prev->next = new_slave;
1155 }
1156
1157 bond->slave_cnt++;
1158}
1159
1160/*
1161 * This function detaches the slave from the list.
1162 * WARNING: no check is made to verify if the slave effectively
1163 * belongs to <bond>.
1164 * Nothing is freed on return, structures are just unchained.
1165 * If any slave pointer in bond was pointing to <slave>,
1166 * it should be changed by the calling function.
1167 *
1168 * bond->lock held for writing by caller.
1169 */
1170static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1171{
1172 if (slave->next) {
1173 slave->next->prev = slave->prev;
1174 }
1175
1176 if (slave->prev) {
1177 slave->prev->next = slave->next;
1178 }
1179
1180 if (bond->first_slave == slave) { /* slave is the first slave */
1181 if (bond->slave_cnt > 1) { /* there are more slave */
1182 bond->first_slave = slave->next;
1183 } else {
1184 bond->first_slave = NULL; /* slave was the last one */
1185 }
1186 }
1187
1188 slave->next = NULL;
1189 slave->prev = NULL;
1190 bond->slave_cnt--;
1191}
1192
1193/*---------------------------------- IOCTL ----------------------------------*/
1194
4ad072c9
AB		 1195static int bond_sethwaddr(struct net_device *bond_dev,
1196 struct net_device *slave_dev)
1da177e4
LT		 1197{
1198 dprintk("bond_dev=%p\n", bond_dev);
1199 dprintk("slave_dev=%p\n", slave_dev);
1200 dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1201 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1202 return 0;
1203}
1204
7f353bf2
HX		 1205#define BOND_VLAN_FEATURES \
1206 (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1207 NETIF_F_HW_VLAN_FILTER)
8531c5ff
AK		 1208
1209/*
8e3babcd 1210 * Compute the common dev->feature set available to all slaves. Some
7f353bf2
HX		 1211 * feature bits are managed elsewhere, so preserve those feature bits
1212 * on the master device.
8531c5ff
AK		 1213 */
1214static int bond_compute_features(struct bonding *bond)
1215{
8531c5ff
AK		 1216 struct slave *slave;
1217 struct net_device *bond_dev = bond->dev;
7f353bf2 1218 unsigned long features = bond_dev->features;
54ef3137 1219 unsigned short max_hard_header_len = ETH_HLEN;
8e3babcd 1220 int i;
8531c5ff 1221
7f353bf2
HX		 1222 features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1223 features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
1224 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1225
54ef3137 1226 bond_for_each_slave(bond, slave, i) {
7f353bf2
HX		 1227 features = netdev_compute_features(features,
1228 slave->dev->features);
54ef3137
JV		 1229 if (slave->dev->hard_header_len > max_hard_header_len)
1230 max_hard_header_len = slave->dev->hard_header_len;
1231 }
8531c5ff 1232
7f353bf2 1233 features |= (bond_dev->features & BOND_VLAN_FEATURES);
8531c5ff 1234 bond_dev->features = features;
54ef3137 1235 bond_dev->hard_header_len = max_hard_header_len;
8531c5ff
AK		 1236
1237 return 0;
1238}
1239
1da177e4 1240/* enslave device <slave> to bond device <master> */
a77b5325 1241int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1242{
1243 struct bonding *bond = bond_dev->priv;
1244 struct slave *new_slave = NULL;
1245 struct dev_mc_list *dmi;
1246 struct sockaddr addr;
1247 int link_reporting;
1248 int old_features = bond_dev->features;
1249 int res = 0;
1250
552709d5 1251 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1252 slave_dev->do_ioctl == NULL) {
1da177e4 1253 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1254 ": %s: Warning: no link monitoring support for %s\n",
1255 bond_dev->name, slave_dev->name);
1da177e4
LT		 1256 }
1257
1258 /* bond must be initialized by bond_open() before enslaving */
1259 if (!(bond_dev->flags & IFF_UP)) {
1260 dprintk("Error, master_dev is not up\n");
1261 return -EPERM;
1262 }
1263
1264 /* already enslaved */
1265 if (slave_dev->flags & IFF_SLAVE) {
1266 dprintk("Error, Device was already enslaved\n");
1267 return -EBUSY;
1268 }
1269
1270 /* vlan challenged mutual exclusion */
1271 /* no need to lock since we're protected by rtnl_lock */
1272 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1273 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1274 if (!list_empty(&bond->vlan_list)) {
1275 printk(KERN_ERR DRV_NAME
4e0952c7 1276 ": %s: Error: cannot enslave VLAN "
1da177e4 1277 "challenged slave %s on VLAN enabled "
4e0952c7 1278 "bond %s\n", bond_dev->name, slave_dev->name,
1da177e4
LT		 1279 bond_dev->name);
1280 return -EPERM;
1281 } else {
1282 printk(KERN_WARNING DRV_NAME
4e0952c7 1283 ": %s: Warning: enslaved VLAN challenged "
1da177e4
LT		 1284 "slave %s. Adding VLANs will be blocked as "
1285 "long as %s is part of bond %s\n",
4e0952c7 1286 bond_dev->name, slave_dev->name, slave_dev->name,
1da177e4
LT		 1287 bond_dev->name);
1288 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1289 }
1290 } else {
1291 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1292 if (bond->slave_cnt == 0) {
1293 /* First slave, and it is not VLAN challenged,
1294 * so remove the block of adding VLANs over the bond.
1295 */
1296 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1297 }
1298 }
1299
217df670
JV		 1300 /*
1301 * Old ifenslave binaries are no longer supported. These can
1302 * be identified with moderate accurary by the state of the slave:
1303 * the current ifenslave will set the interface down prior to
1304 * enslaving it; the old ifenslave will not.
1305 */
1306 if ((slave_dev->flags & IFF_UP)) {
1307 printk(KERN_ERR DRV_NAME ": %s is up. "
1308 "This may be due to an out of date ifenslave.\n",
1309 slave_dev->name);
1310 res = -EPERM;
1311 goto err_undo_flags;
1312 }
1da177e4 1313
217df670
JV		 1314 if (slave_dev->set_mac_address == NULL) {
1315 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 1316 ": %s: Error: The slave device you specified does "
1317 "not support setting the MAC address. "
1318 "Your kernel likely does not support slave "
1319 "devices.\n", bond_dev->name);
1320 res = -EOPNOTSUPP;
217df670 1321 goto err_undo_flags;
1da177e4
LT		 1322 }
1323
243cb4e5 1324 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1da177e4
LT		 1325 if (!new_slave) {
1326 res = -ENOMEM;
1327 goto err_undo_flags;
1328 }
1329
1da177e4
LT		 1330 /* save slave's original flags before calling
1331 * netdev_set_master and dev_open
1332 */
1333 new_slave->original_flags = slave_dev->flags;
1334
217df670
JV		 1335 /*
1336 * Save slave's original ("permanent") mac address for modes
1337 * that need it, and for restoring it upon release, and then
1338 * set it to the master's address
1339 */
1340 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1da177e4 1341
217df670
JV		 1342 /*
1343 * Set slave to master's mac address. The application already
1344 * set the master's mac address to that of the first slave
1345 */
1346 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1347 addr.sa_family = slave_dev->type;
1348 res = dev_set_mac_address(slave_dev, &addr);
1349 if (res) {
1350 dprintk("Error %d calling set_mac_address\n", res);
1351 goto err_free;
1352 }
1da177e4 1353
c2edacf8
JV		 1354 res = netdev_set_master(slave_dev, bond_dev);
1355 if (res) {
1356 dprintk("Error %d calling netdev_set_master\n", res);
1357 goto err_close;
1358 }
217df670
JV		 1359 /* open the slave since the application closed it */
1360 res = dev_open(slave_dev);
1361 if (res) {
1362 dprintk("Openning slave %s failed\n", slave_dev->name);
1363 goto err_restore_mac;
1da177e4
LT		 1364 }
1365
1da177e4 1366 new_slave->dev = slave_dev;
0b680e75 1367 slave_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 1368
1369 if ((bond->params.mode == BOND_MODE_TLB) ||
1370 (bond->params.mode == BOND_MODE_ALB)) {
1371 /* bond_alb_init_slave() must be called before all other stages since
1372 * it might fail and we do not want to have to undo everything
1373 */
1374 res = bond_alb_init_slave(bond, new_slave);
1375 if (res) {
1376 goto err_unset_master;
1377 }
1378 }
1379
1380 /* If the mode USES_PRIMARY, then the new slave gets the
1381 * master's promisc (and mc) settings only if it becomes the
1382 * curr_active_slave, and that is taken care of later when calling
1383 * bond_change_active()
1384 */
1385 if (!USES_PRIMARY(bond->params.mode)) {
1386 /* set promiscuity level to new slave */
1387 if (bond_dev->flags & IFF_PROMISC) {
1388 dev_set_promiscuity(slave_dev, 1);
1389 }
1390
1391 /* set allmulti level to new slave */
1392 if (bond_dev->flags & IFF_ALLMULTI) {
1393 dev_set_allmulti(slave_dev, 1);
1394 }
1395
1396 /* upload master's mc_list to new slave */
1397 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1398 dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1399 }
1400 }
1401
1402 if (bond->params.mode == BOND_MODE_8023AD) {
1403 /* add lacpdu mc addr to mc list */
1404 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1405
1406 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1407 }
1408
1409 bond_add_vlans_on_slave(bond, slave_dev);
1410
1411 write_lock_bh(&bond->lock);
1412
1413 bond_attach_slave(bond, new_slave);
1414
1415 new_slave->delay = 0;
1416 new_slave->link_failure_count = 0;
1417
8531c5ff
AK		 1418 bond_compute_features(bond);
1419
f5b2b966
JV		 1420 new_slave->last_arp_rx = jiffies;
1421
1da177e4
LT		 1422 if (bond->params.miimon && !bond->params.use_carrier) {
1423 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1424
1425 if ((link_reporting == -1) && !bond->params.arp_interval) {
1426 /*
1427 * miimon is set but a bonded network driver
1428 * does not support ETHTOOL/MII and
1429 * arp_interval is not set. Note: if
1430 * use_carrier is enabled, we will never go
1431 * here (because netif_carrier is always
1432 * supported); thus, we don't need to change
1433 * the messages for netif_carrier.
1434 */
1435 printk(KERN_WARNING DRV_NAME
4e0952c7 1436 ": %s: Warning: MII and ETHTOOL support not "
1da177e4
LT		 1437 "available for interface %s, and "
1438 "arp_interval/arp_ip_target module parameters "
1439 "not specified, thus bonding will not detect "
1440 "link failures! see bonding.txt for details.\n",
4e0952c7 1441 bond_dev->name, slave_dev->name);
1da177e4
LT		 1442 } else if (link_reporting == -1) {
1443 /* unable get link status using mii/ethtool */
1444 printk(KERN_WARNING DRV_NAME
4e0952c7 1445 ": %s: Warning: can't get link status from "
1da177e4
LT		 1446 "interface %s; the network driver associated "
1447 "with this interface does not support MII or "
1448 "ETHTOOL link status reporting, thus miimon "
1449 "has no effect on this interface.\n",
4e0952c7 1450 bond_dev->name, slave_dev->name);
1da177e4
LT		 1451 }
1452 }
1453
1454 /* check for initial state */
1455 if (!bond->params.miimon ||
1456 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1457 if (bond->params.updelay) {
1458 dprintk("Initial state of slave_dev is "
1459 "BOND_LINK_BACK\n");
1460 new_slave->link = BOND_LINK_BACK;
1461 new_slave->delay = bond->params.updelay;
1462 } else {
1463 dprintk("Initial state of slave_dev is "
1464 "BOND_LINK_UP\n");
1465 new_slave->link = BOND_LINK_UP;
1466 }
1467 new_slave->jiffies = jiffies;
1468 } else {
1469 dprintk("Initial state of slave_dev is "
1470 "BOND_LINK_DOWN\n");
1471 new_slave->link = BOND_LINK_DOWN;
1472 }
1473
1474 if (bond_update_speed_duplex(new_slave) &&
1475 (new_slave->link != BOND_LINK_DOWN)) {
1476 printk(KERN_WARNING DRV_NAME
4e0952c7 1477 ": %s: Warning: failed to get speed and duplex from %s, "
1da177e4 1478 "assumed to be 100Mb/sec and Full.\n",
4e0952c7 1479 bond_dev->name, new_slave->dev->name);
1da177e4
LT		 1480
1481 if (bond->params.mode == BOND_MODE_8023AD) {
4e0952c7
MW		 1482 printk(KERN_WARNING DRV_NAME
1483 ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1da177e4 1484 "support in base driver for proper aggregator "
4e0952c7 1485 "selection.\n", bond_dev->name);
1da177e4
LT		 1486 }
1487 }
1488
1489 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1490 /* if there is a primary slave, remember it */
1491 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1492 bond->primary_slave = new_slave;
1493 }
1494 }
1495
1496 switch (bond->params.mode) {
1497 case BOND_MODE_ACTIVEBACKUP:
8a8e447b
JV		 1498 bond_set_slave_inactive_flags(new_slave);
1499 bond_select_active_slave(bond);
1da177e4
LT		 1500 break;
1501 case BOND_MODE_8023AD:
1502 /* in 802.3ad mode, the internal mechanism
1503 * will activate the slaves in the selected
1504 * aggregator
1505 */
1506 bond_set_slave_inactive_flags(new_slave);
1507 /* if this is the first slave */
1508 if (bond->slave_cnt == 1) {
1509 SLAVE_AD_INFO(new_slave).id = 1;
1510 /* Initialize AD with the number of times that the AD timer is called in 1 second
1511 * can be called only after the mac address of the bond is set
1512 */
1513 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1514 bond->params.lacp_fast);
1515 } else {
1516 SLAVE_AD_INFO(new_slave).id =
1517 SLAVE_AD_INFO(new_slave->prev).id + 1;
1518 }
1519
1520 bond_3ad_bind_slave(new_slave);
1521 break;
1522 case BOND_MODE_TLB:
1523 case BOND_MODE_ALB:
1524 new_slave->state = BOND_STATE_ACTIVE;
1525 if ((!bond->curr_active_slave) &&
1526 (new_slave->link != BOND_LINK_DOWN)) {
1527 /* first slave or no active slave yet, and this link
1528 * is OK, so make this interface the active one
1529 */
1530 bond_change_active_slave(bond, new_slave);
8f903c70
JV		 1531 } else {
1532 bond_set_slave_inactive_flags(new_slave);
1da177e4
LT		 1533 }
1534 break;
1535 default:
1536 dprintk("This slave is always active in trunk mode\n");
1537
1538 /* always active in trunk mode */
1539 new_slave->state = BOND_STATE_ACTIVE;
1540
1541 /* In trunking mode there is little meaning to curr_active_slave
1542 * anyway (it holds no special properties of the bond device),
1543 * so we can change it without calling change_active_interface()
1544 */
1545 if (!bond->curr_active_slave) {
1546 bond->curr_active_slave = new_slave;
1547 }
1548 break;
1549 } /* switch(bond_mode) */
1550
ff59c456
JV		 1551 bond_set_carrier(bond);
1552
1da177e4
LT		 1553 write_unlock_bh(&bond->lock);
1554
b76cdba9
MW		 1555 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1556 if (res)
1557 goto err_unset_master;
1558
1da177e4
LT		 1559 printk(KERN_INFO DRV_NAME
1560 ": %s: enslaving %s as a%s interface with a%s link.\n",
1561 bond_dev->name, slave_dev->name,
1562 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1563 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1564
1565 /* enslave is successful */
1566 return 0;
1567
1568/* Undo stages on error */
1569err_unset_master:
1570 netdev_set_master(slave_dev, NULL);
1571
1572err_close:
1573 dev_close(slave_dev);
1574
1575err_restore_mac:
1576 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1577 addr.sa_family = slave_dev->type;
1578 dev_set_mac_address(slave_dev, &addr);
1579
1580err_free:
1581 kfree(new_slave);
1582
1583err_undo_flags:
1584 bond_dev->features = old_features;
8531c5ff 1585
1da177e4
LT		 1586 return res;
1587}
1588
1589/*
1590 * Try to release the slave device <slave> from the bond device <master>
1591 * It is legal to access curr_active_slave without a lock because all the function
1592 * is write-locked.
1593 *
1594 * The rules for slave state should be:
1595 * for Active/Backup:
1596 * Active stays on all backups go down
1597 * for Bonded connections:
1598 * The first up interface should be left on and all others downed.
1599 */
a77b5325 1600int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1601{
1602 struct bonding *bond = bond_dev->priv;
1603 struct slave *slave, *oldcurrent;
1604 struct sockaddr addr;
1605 int mac_addr_differ;
1606
1607 /* slave is not a slave or master is not master of this slave */
1608 if (!(slave_dev->flags & IFF_SLAVE) ||
1609 (slave_dev->master != bond_dev)) {
1610 printk(KERN_ERR DRV_NAME
4e0952c7 1611 ": %s: Error: cannot release %s.\n",
1da177e4
LT		 1612 bond_dev->name, slave_dev->name);
1613 return -EINVAL;
1614 }
1615
1616 write_lock_bh(&bond->lock);
1617
1618 slave = bond_get_slave_by_dev(bond, slave_dev);
1619 if (!slave) {
1620 /* not a slave of this bond */
1621 printk(KERN_INFO DRV_NAME
1622 ": %s: %s not enslaved\n",
1623 bond_dev->name, slave_dev->name);
f5e2a7b2 1624 write_unlock_bh(&bond->lock);
1da177e4
LT		 1625 return -EINVAL;
1626 }
1627
1628 mac_addr_differ = memcmp(bond_dev->dev_addr,
1629 slave->perm_hwaddr,
1630 ETH_ALEN);
1631 if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1632 printk(KERN_WARNING DRV_NAME
4e0952c7 1633 ": %s: Warning: the permanent HWaddr of %s "
1da177e4
LT		 1634 "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1635 "still in use by %s. Set the HWaddr of "
1636 "%s to a different address to avoid "
1637 "conflicts.\n",
4e0952c7 1638 bond_dev->name,
1da177e4
LT		 1639 slave_dev->name,
1640 slave->perm_hwaddr[0],
1641 slave->perm_hwaddr[1],
1642 slave->perm_hwaddr[2],
1643 slave->perm_hwaddr[3],
1644 slave->perm_hwaddr[4],
1645 slave->perm_hwaddr[5],
1646 bond_dev->name,
1647 slave_dev->name);
1648 }
1649
1650 /* Inform AD package of unbinding of slave. */
1651 if (bond->params.mode == BOND_MODE_8023AD) {
1652 /* must be called before the slave is
1653 * detached from the list
1654 */
1655 bond_3ad_unbind_slave(slave);
1656 }
1657
1658 printk(KERN_INFO DRV_NAME
1659 ": %s: releasing %s interface %s\n",
1660 bond_dev->name,
1661 (slave->state == BOND_STATE_ACTIVE)
1662 ? "active" : "backup",
1663 slave_dev->name);
1664
1665 oldcurrent = bond->curr_active_slave;
1666
1667 bond->current_arp_slave = NULL;
1668
1669 /* release the slave from its bond */
1670 bond_detach_slave(bond, slave);
1671
8531c5ff
AK		 1672 bond_compute_features(bond);
1673
1da177e4
LT		 1674 if (bond->primary_slave == slave) {
1675 bond->primary_slave = NULL;
1676 }
1677
1678 if (oldcurrent == slave) {
1679 bond_change_active_slave(bond, NULL);
1680 }
1681
1682 if ((bond->params.mode == BOND_MODE_TLB) ||
1683 (bond->params.mode == BOND_MODE_ALB)) {
1684 /* Must be called only after the slave has been
1685 * detached from the list and the curr_active_slave
1686 * has been cleared (if our_slave == old_current),
1687 * but before a new active slave is selected.
1688 */
1689 bond_alb_deinit_slave(bond, slave);
1690 }
1691
ff59c456 1692 if (oldcurrent == slave)
1da177e4
LT		 1693 bond_select_active_slave(bond);
1694
1da177e4 1695 if (bond->slave_cnt == 0) {
ff59c456
JV		 1696 bond_set_carrier(bond);
1697
1da177e4
LT		 1698 /* if the last slave was removed, zero the mac address
1699 * of the master so it will be set by the application
1700 * to the mac address of the first slave
1701 */
1702 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1703
1704 if (list_empty(&bond->vlan_list)) {
1705 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1706 } else {
1707 printk(KERN_WARNING DRV_NAME
4e0952c7 1708 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1709 "still has VLANs.\n",
4e0952c7 1710 bond_dev->name, bond_dev->name);
1da177e4 1711 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1712 ": %s: When re-adding slaves, make sure the bond's "
1713 "HW address matches its VLANs'.\n",
1714 bond_dev->name);
1da177e4
LT		 1715 }
1716 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1717 !bond_has_challenged_slaves(bond)) {
1718 printk(KERN_INFO DRV_NAME
4e0952c7 1719 ": %s: last VLAN challenged slave %s "
1da177e4 1720 "left bond %s. VLAN blocking is removed\n",
4e0952c7 1721 bond_dev->name, slave_dev->name, bond_dev->name);
1da177e4
LT		 1722 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1723 }
1724
1725 write_unlock_bh(&bond->lock);
1726
b76cdba9
MW		 1727 /* must do this from outside any spinlocks */
1728 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1729
1da177e4
LT		 1730 bond_del_vlans_from_slave(bond, slave_dev);
1731
1732 /* If the mode USES_PRIMARY, then we should only remove its
1733 * promisc and mc settings if it was the curr_active_slave, but that was
1734 * already taken care of above when we detached the slave
1735 */
1736 if (!USES_PRIMARY(bond->params.mode)) {
1737 /* unset promiscuity level from slave */
1738 if (bond_dev->flags & IFF_PROMISC) {
1739 dev_set_promiscuity(slave_dev, -1);
1740 }
1741
1742 /* unset allmulti level from slave */
1743 if (bond_dev->flags & IFF_ALLMULTI) {
1744 dev_set_allmulti(slave_dev, -1);
1745 }
1746
1747 /* flush master's mc_list from slave */
1748 bond_mc_list_flush(bond_dev, slave_dev);
1749 }
1750
1751 netdev_set_master(slave_dev, NULL);
1752
1753 /* close slave before restoring its mac address */
1754 dev_close(slave_dev);
1755
217df670
JV		 1756 /* restore original ("permanent") mac address */
1757 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1758 addr.sa_family = slave_dev->type;
1759 dev_set_mac_address(slave_dev, &addr);
1da177e4 1760
8f903c70 1761 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
f5b2b966
JV		 1762 IFF_SLAVE_INACTIVE | IFF_BONDING |
1763 IFF_SLAVE_NEEDARP);
1da177e4
LT		 1764
1765 kfree(slave);
1766
1767 return 0; /* deletion OK */
1768}
1769
1770/*
1771 * This function releases all slaves.
1772 */
1773static int bond_release_all(struct net_device *bond_dev)
1774{
1775 struct bonding *bond = bond_dev->priv;
1776 struct slave *slave;
1777 struct net_device *slave_dev;
1778 struct sockaddr addr;
1779
1780 write_lock_bh(&bond->lock);
1781
ff59c456
JV		 1782 netif_carrier_off(bond_dev);
1783
1da177e4
LT		 1784 if (bond->slave_cnt == 0) {
1785 goto out;
1786 }
1787
1788 bond->current_arp_slave = NULL;
1789 bond->primary_slave = NULL;
1790 bond_change_active_slave(bond, NULL);
1791
1792 while ((slave = bond->first_slave) != NULL) {
1793 /* Inform AD package of unbinding of slave
1794 * before slave is detached from the list.
1795 */
1796 if (bond->params.mode == BOND_MODE_8023AD) {
1797 bond_3ad_unbind_slave(slave);
1798 }
1799
1800 slave_dev = slave->dev;
1801 bond_detach_slave(bond, slave);
1802
1803 if ((bond->params.mode == BOND_MODE_TLB) ||
1804 (bond->params.mode == BOND_MODE_ALB)) {
1805 /* must be called only after the slave
1806 * has been detached from the list
1807 */
1808 bond_alb_deinit_slave(bond, slave);
1809 }
1810
8531c5ff
AK		 1811 bond_compute_features(bond);
1812
1da177e4
LT		 1813 /* now that the slave is detached, unlock and perform
1814 * all the undo steps that should not be called from
1815 * within a lock.
1816 */
1817 write_unlock_bh(&bond->lock);
1818
b76cdba9 1819 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1da177e4
LT		 1820 bond_del_vlans_from_slave(bond, slave_dev);
1821
1822 /* If the mode USES_PRIMARY, then we should only remove its
1823 * promisc and mc settings if it was the curr_active_slave, but that was
1824 * already taken care of above when we detached the slave
1825 */
1826 if (!USES_PRIMARY(bond->params.mode)) {
1827 /* unset promiscuity level from slave */
1828 if (bond_dev->flags & IFF_PROMISC) {
1829 dev_set_promiscuity(slave_dev, -1);
1830 }
1831
1832 /* unset allmulti level from slave */
1833 if (bond_dev->flags & IFF_ALLMULTI) {
1834 dev_set_allmulti(slave_dev, -1);
1835 }
1836
1837 /* flush master's mc_list from slave */
1838 bond_mc_list_flush(bond_dev, slave_dev);
1839 }
1840
1841 netdev_set_master(slave_dev, NULL);
1842
1843 /* close slave before restoring its mac address */
1844 dev_close(slave_dev);
1845
217df670
JV		 1846 /* restore original ("permanent") mac address*/
1847 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1848 addr.sa_family = slave_dev->type;
1849 dev_set_mac_address(slave_dev, &addr);
1da177e4 1850
8f903c70
JV		 1851 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1852 IFF_SLAVE_INACTIVE);
1da177e4
LT		 1853
1854 kfree(slave);
1855
1856 /* re-acquire the lock before getting the next slave */
1857 write_lock_bh(&bond->lock);
1858 }
1859
1860 /* zero the mac address of the master so it will be
1861 * set by the application to the mac address of the
1862 * first slave
1863 */
1864 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1865
1866 if (list_empty(&bond->vlan_list)) {
1867 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1868 } else {
1869 printk(KERN_WARNING DRV_NAME
4e0952c7 1870 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1871 "still has VLANs.\n",
4e0952c7 1872 bond_dev->name, bond_dev->name);
1da177e4 1873 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1874 ": %s: When re-adding slaves, make sure the bond's "
1875 "HW address matches its VLANs'.\n",
1876 bond_dev->name);
1da177e4
LT		 1877 }
1878
1879 printk(KERN_INFO DRV_NAME
1880 ": %s: released all slaves\n",
1881 bond_dev->name);
1882
1883out:
1884 write_unlock_bh(&bond->lock);
1885
1886 return 0;
1887}
1888
1889/*
1890 * This function changes the active slave to slave <slave_dev>.
1891 * It returns -EINVAL in the following cases.
1892 * - <slave_dev> is not found in the list.
1893 * - There is not active slave now.
1894 * - <slave_dev> is already active.
1895 * - The link state of <slave_dev> is not BOND_LINK_UP.
1896 * - <slave_dev> is not running.
1897 * In these cases, this fuction does nothing.
1898 * In the other cases, currnt_slave pointer is changed and 0 is returned.
1899 */
1900static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1901{
1902 struct bonding *bond = bond_dev->priv;
1903 struct slave *old_active = NULL;
1904 struct slave *new_active = NULL;
1905 int res = 0;
1906
1907 if (!USES_PRIMARY(bond->params.mode)) {
1908 return -EINVAL;
1909 }
1910
1911 /* Verify that master_dev is indeed the master of slave_dev */
1912 if (!(slave_dev->flags & IFF_SLAVE) ||
1913 (slave_dev->master != bond_dev)) {
1914 return -EINVAL;
1915 }
1916
1917 write_lock_bh(&bond->lock);
1918
1919 old_active = bond->curr_active_slave;
1920 new_active = bond_get_slave_by_dev(bond, slave_dev);
1921
1922 /*
1923 * Changing to the current active: do nothing; return success.
1924 */
1925 if (new_active && (new_active == old_active)) {
1926 write_unlock_bh(&bond->lock);
1927 return 0;
1928 }
1929
1930 if ((new_active) &&
1931 (old_active) &&
1932 (new_active->link == BOND_LINK_UP) &&
1933 IS_UP(new_active->dev)) {
1934 bond_change_active_slave(bond, new_active);
1935 } else {
1936 res = -EINVAL;
1937 }
1938
1939 write_unlock_bh(&bond->lock);
1940
1941 return res;
1942}
1943
1da177e4
LT		 1944static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1945{
1946 struct bonding *bond = bond_dev->priv;
1947
1948 info->bond_mode = bond->params.mode;
1949 info->miimon = bond->params.miimon;
1950
1951 read_lock_bh(&bond->lock);
1952 info->num_slaves = bond->slave_cnt;
1953 read_unlock_bh(&bond->lock);
1954
1955 return 0;
1956}
1957
1958static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1959{
1960 struct bonding *bond = bond_dev->priv;
1961 struct slave *slave;
1962 int i, found = 0;
1963
1964 if (info->slave_id < 0) {
1965 return -ENODEV;
1966 }
1967
1968 read_lock_bh(&bond->lock);
1969
1970 bond_for_each_slave(bond, slave, i) {
1971 if (i == (int)info->slave_id) {
1972 found = 1;
1973 break;
1974 }
1975 }
1976
1977 read_unlock_bh(&bond->lock);
1978
1979 if (found) {
1980 strcpy(info->slave_name, slave->dev->name);
1981 info->link = slave->link;
1982 info->state = slave->state;
1983 info->link_failure_count = slave->link_failure_count;
1984 } else {
1985 return -ENODEV;
1986 }
1987
1988 return 0;
1989}
1990
1991/*-------------------------------- Monitoring -------------------------------*/
1992
1993/* this function is called regularly to monitor each slave's link. */
a77b5325 1994void bond_mii_monitor(struct net_device *bond_dev)
1da177e4
LT		 1995{
1996 struct bonding *bond = bond_dev->priv;
1997 struct slave *slave, *oldcurrent;
1998 int do_failover = 0;
1999 int delta_in_ticks;
2000 int i;
2001
2002 read_lock(&bond->lock);
2003
2004 delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2005
2006 if (bond->kill_timers) {
2007 goto out;
2008 }
2009
2010 if (bond->slave_cnt == 0) {
2011 goto re_arm;
2012 }
2013
2014 /* we will try to read the link status of each of our slaves, and
2015 * set their IFF_RUNNING flag appropriately. For each slave not
2016 * supporting MII status, we won't do anything so that a user-space
2017 * program could monitor the link itself if needed.
2018 */
2019
2020 read_lock(&bond->curr_slave_lock);
2021 oldcurrent = bond->curr_active_slave;
2022 read_unlock(&bond->curr_slave_lock);
2023
2024 bond_for_each_slave(bond, slave, i) {
2025 struct net_device *slave_dev = slave->dev;
2026 int link_state;
2027 u16 old_speed = slave->speed;
2028 u8 old_duplex = slave->duplex;
2029
2030 link_state = bond_check_dev_link(bond, slave_dev, 0);
2031
2032 switch (slave->link) {
2033 case BOND_LINK_UP: /* the link was up */
2034 if (link_state == BMSR_LSTATUS) {
2035 /* link stays up, nothing more to do */
2036 break;
2037 } else { /* link going down */
2038 slave->link = BOND_LINK_FAIL;
2039 slave->delay = bond->params.downdelay;
2040
2041 if (slave->link_failure_count < UINT_MAX) {
2042 slave->link_failure_count++;
2043 }
2044
2045 if (bond->params.downdelay) {
2046 printk(KERN_INFO DRV_NAME
2047 ": %s: link status down for %s "
2048 "interface %s, disabling it in "
2049 "%d ms.\n",
2050 bond_dev->name,
2051 IS_UP(slave_dev)
2052 ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2053 ? ((slave == oldcurrent)
2054 ? "active " : "backup ")
2055 : "")
2056 : "idle ",
2057 slave_dev->name,
2058 bond->params.downdelay * bond->params.miimon);
2059 }
2060 }
2061 /* no break ! fall through the BOND_LINK_FAIL test to
2062 ensure proper action to be taken
2063 */
2064 case BOND_LINK_FAIL: /* the link has just gone down */
2065 if (link_state != BMSR_LSTATUS) {
2066 /* link stays down */
2067 if (slave->delay <= 0) {
2068 /* link down for too long time */
2069 slave->link = BOND_LINK_DOWN;
2070
2071 /* in active/backup mode, we must
2072 * completely disable this interface
2073 */
2074 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2075 (bond->params.mode == BOND_MODE_8023AD)) {
2076 bond_set_slave_inactive_flags(slave);
2077 }
2078
2079 printk(KERN_INFO DRV_NAME
2080 ": %s: link status definitely "
2081 "down for interface %s, "
2082 "disabling it\n",
2083 bond_dev->name,
2084 slave_dev->name);
2085
2086 /* notify ad that the link status has changed */
2087 if (bond->params.mode == BOND_MODE_8023AD) {
2088 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2089 }
2090
2091 if ((bond->params.mode == BOND_MODE_TLB) ||
2092 (bond->params.mode == BOND_MODE_ALB)) {
2093 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2094 }
2095
2096 if (slave == oldcurrent) {
2097 do_failover = 1;
2098 }
2099 } else {
2100 slave->delay--;
2101 }
2102 } else {
2103 /* link up again */
2104 slave->link = BOND_LINK_UP;
2105 slave->jiffies = jiffies;
2106 printk(KERN_INFO DRV_NAME
2107 ": %s: link status up again after %d "
2108 "ms for interface %s.\n",
2109 bond_dev->name,
2110 (bond->params.downdelay - slave->delay) * bond->params.miimon,
2111 slave_dev->name);
2112 }
2113 break;
2114 case BOND_LINK_DOWN: /* the link was down */
2115 if (link_state != BMSR_LSTATUS) {
2116 /* the link stays down, nothing more to do */
2117 break;
2118 } else { /* link going up */
2119 slave->link = BOND_LINK_BACK;
2120 slave->delay = bond->params.updelay;
2121
2122 if (bond->params.updelay) {
2123 /* if updelay == 0, no need to
2124 advertise about a 0 ms delay */
2125 printk(KERN_INFO DRV_NAME
2126 ": %s: link status up for "
2127 "interface %s, enabling it "
2128 "in %d ms.\n",
2129 bond_dev->name,
2130 slave_dev->name,
2131 bond->params.updelay * bond->params.miimon);
2132 }
2133 }
2134 /* no break ! fall through the BOND_LINK_BACK state in
2135 case there's something to do.
2136 */
2137 case BOND_LINK_BACK: /* the link has just come back */
2138 if (link_state != BMSR_LSTATUS) {
2139 /* link down again */
2140 slave->link = BOND_LINK_DOWN;
2141
2142 printk(KERN_INFO DRV_NAME
2143 ": %s: link status down again after %d "
2144 "ms for interface %s.\n",
2145 bond_dev->name,
2146 (bond->params.updelay - slave->delay) * bond->params.miimon,
2147 slave_dev->name);
2148 } else {
2149 /* link stays up */
2150 if (slave->delay == 0) {
2151 /* now the link has been up for long time enough */
2152 slave->link = BOND_LINK_UP;
2153 slave->jiffies = jiffies;
2154
2155 if (bond->params.mode == BOND_MODE_8023AD) {
2156 /* prevent it from being the active one */
2157 slave->state = BOND_STATE_BACKUP;
2158 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2159 /* make it immediately active */
2160 slave->state = BOND_STATE_ACTIVE;
2161 } else if (slave != bond->primary_slave) {
2162 /* prevent it from being the active one */
2163 slave->state = BOND_STATE_BACKUP;
2164 }
2165
2166 printk(KERN_INFO DRV_NAME
2167 ": %s: link status definitely "
2168 "up for interface %s.\n",
2169 bond_dev->name,
2170 slave_dev->name);
2171
2172 /* notify ad that the link status has changed */
2173 if (bond->params.mode == BOND_MODE_8023AD) {
2174 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2175 }
2176
2177 if ((bond->params.mode == BOND_MODE_TLB) ||
2178 (bond->params.mode == BOND_MODE_ALB)) {
2179 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2180 }
2181
2182 if ((!oldcurrent) ||
2183 (slave == bond->primary_slave)) {
2184 do_failover = 1;
2185 }
2186 } else {
2187 slave->delay--;
2188 }
2189 }
2190 break;
2191 default:
2192 /* Should not happen */
4e0952c7
MW		 2193 printk(KERN_ERR DRV_NAME
2194 ": %s: Error: %s Illegal value (link=%d)\n",
2195 bond_dev->name,
2196 slave->dev->name,
2197 slave->link);
1da177e4
LT		 2198 goto out;
2199 } /* end of switch (slave->link) */
2200
2201 bond_update_speed_duplex(slave);
2202
2203 if (bond->params.mode == BOND_MODE_8023AD) {
2204 if (old_speed != slave->speed) {
2205 bond_3ad_adapter_speed_changed(slave);
2206 }
2207
2208 if (old_duplex != slave->duplex) {
2209 bond_3ad_adapter_duplex_changed(slave);
2210 }
2211 }
2212
2213 } /* end of for */
2214
2215 if (do_failover) {
2216 write_lock(&bond->curr_slave_lock);
2217
2218 bond_select_active_slave(bond);
2219
1da177e4 2220 write_unlock(&bond->curr_slave_lock);
ff59c456
JV		 2221 } else
2222 bond_set_carrier(bond);
1da177e4
LT		 2223
2224re_arm:
2225 if (bond->params.miimon) {
2226 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2227 }
2228out:
2229 read_unlock(&bond->lock);
2230}
2231
c3ade5ca
JV		 2232
2233static u32 bond_glean_dev_ip(struct net_device *dev)
2234{
2235 struct in_device *idev;
2236 struct in_ifaddr *ifa;
a144ea4b 2237 __be32 addr = 0;
c3ade5ca
JV		 2238
2239 if (!dev)
2240 return 0;
2241
2242 rcu_read_lock();
e5ed6399 2243 idev = __in_dev_get_rcu(dev);
c3ade5ca
JV		 2244 if (!idev)
2245 goto out;
2246
2247 ifa = idev->ifa_list;
2248 if (!ifa)
2249 goto out;
2250
2251 addr = ifa->ifa_local;
2252out:
2253 rcu_read_unlock();
2254 return addr;
2255}
2256
2257static int bond_has_ip(struct bonding *bond)
2258{
2259 struct vlan_entry *vlan, *vlan_next;
2260
2261 if (bond->master_ip)
2262 return 1;
2263
2264 if (list_empty(&bond->vlan_list))
2265 return 0;
2266
2267 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2268 vlan_list) {
2269 if (vlan->vlan_ip)
2270 return 1;
2271 }
2272
2273 return 0;
2274}
2275
f5b2b966
JV		 2276static int bond_has_this_ip(struct bonding *bond, u32 ip)
2277{
2278 struct vlan_entry *vlan, *vlan_next;
2279
2280 if (ip == bond->master_ip)
2281 return 1;
2282
2283 if (list_empty(&bond->vlan_list))
2284 return 0;
2285
2286 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2287 vlan_list) {
2288 if (ip == vlan->vlan_ip)
2289 return 1;
2290 }
2291
2292 return 0;
2293}
2294
c3ade5ca
JV		 2295/*
2296 * We go to the (large) trouble of VLAN tagging ARP frames because
2297 * switches in VLAN mode (especially if ports are configured as
2298 * "native" to a VLAN) might not pass non-tagged frames.
2299 */
2300static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2301{
2302 struct sk_buff *skb;
2303
2304 dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2305 slave_dev->name, dest_ip, src_ip, vlan_id);
2306
2307 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2308 NULL, slave_dev->dev_addr, NULL);
2309
2310 if (!skb) {
2311 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2312 return;
2313 }
2314 if (vlan_id) {
2315 skb = vlan_put_tag(skb, vlan_id);
2316 if (!skb) {
2317 printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2318 return;
2319 }
2320 }
2321 arp_xmit(skb);
2322}
2323
2324
1da177e4
LT		 2325static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2326{
c3ade5ca 2327 int i, vlan_id, rv;
1da177e4 2328 u32 *targets = bond->params.arp_targets;
c3ade5ca
JV		 2329 struct vlan_entry *vlan, *vlan_next;
2330 struct net_device *vlan_dev;
2331 struct flowi fl;
2332 struct rtable *rt;
1da177e4 2333
6b780567
MW		 2334 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2335 if (!targets[i])
2336 continue;
c3ade5ca
JV		 2337 dprintk("basa: target %x\n", targets[i]);
2338 if (list_empty(&bond->vlan_list)) {
2339 dprintk("basa: empty vlan: arp_send\n");
2340 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2341 bond->master_ip, 0);
2342 continue;
2343 }
2344
2345 /*
2346 * If VLANs are configured, we do a route lookup to
2347 * determine which VLAN interface would be used, so we
2348 * can tag the ARP with the proper VLAN tag.
2349 */
2350 memset(&fl, 0, sizeof(fl));
2351 fl.fl4_dst = targets[i];
2352 fl.fl4_tos = RTO_ONLINK;
2353
2354 rv = ip_route_output_key(&rt, &fl);
2355 if (rv) {
2356 if (net_ratelimit()) {
2357 printk(KERN_WARNING DRV_NAME
2358 ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2359 bond->dev->name, NIPQUAD(fl.fl4_dst));
2360 }
2361 continue;
2362 }
2363
2364 /*
2365 * This target is not on a VLAN
2366 */
2367 if (rt->u.dst.dev == bond->dev) {
ed4b9f80 2368 ip_rt_put(rt);
c3ade5ca
JV		 2369 dprintk("basa: rtdev == bond->dev: arp_send\n");
2370 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2371 bond->master_ip, 0);
2372 continue;
2373 }
2374
2375 vlan_id = 0;
2376 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2377 vlan_list) {
5c15bdec 2378 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 2379 if (vlan_dev == rt->u.dst.dev) {
2380 vlan_id = vlan->vlan_id;
2381 dprintk("basa: vlan match on %s %d\n",
2382 vlan_dev->name, vlan_id);
2383 break;
2384 }
2385 }
2386
2387 if (vlan_id) {
ed4b9f80 2388 ip_rt_put(rt);
c3ade5ca
JV		 2389 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2390 vlan->vlan_ip, vlan_id);
2391 continue;
2392 }
2393
2394 if (net_ratelimit()) {
2395 printk(KERN_WARNING DRV_NAME
2396 ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2397 bond->dev->name, NIPQUAD(fl.fl4_dst),
2398 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2399 }
ed4b9f80 2400 ip_rt_put(rt);
c3ade5ca
JV		 2401 }
2402}
2403
2404/*
2405 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2406 * for each VLAN above us.
2407 */
2408static void bond_send_gratuitous_arp(struct bonding *bond)
2409{
2410 struct slave *slave = bond->curr_active_slave;
2411 struct vlan_entry *vlan;
2412 struct net_device *vlan_dev;
2413
2414 dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2415 slave ? slave->dev->name : "NULL");
2416 if (!slave)
2417 return;
2418
2419 if (bond->master_ip) {
2420 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2421 bond->master_ip, 0);
2422 }
2423
2424 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
5c15bdec 2425 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 2426 if (vlan->vlan_ip) {
2427 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2428 vlan->vlan_ip, vlan->vlan_id);
2429 }
1da177e4
LT		 2430 }
2431}
2432
f5b2b966
JV		 2433static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
2434{
2435 int i;
2436 u32 *targets = bond->params.arp_targets;
2437
2438 targets = bond->params.arp_targets;
2439 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2440 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2441 "%u.%u.%u.%u bhti(tip) %d\n",
2442 NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2443 bond_has_this_ip(bond, tip));
2444 if (sip == targets[i]) {
2445 if (bond_has_this_ip(bond, tip))
2446 slave->last_arp_rx = jiffies;
2447 return;
2448 }
2449 }
2450}
2451
2452static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2453{
2454 struct arphdr *arp;
2455 struct slave *slave;
2456 struct bonding *bond;
2457 unsigned char *arp_ptr;
2458 u32 sip, tip;
2459
2460 if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2461 goto out;
2462
2463 bond = dev->priv;
2464 read_lock(&bond->lock);
2465
2466 dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2467 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2468 orig_dev ? orig_dev->name : "NULL");
2469
2470 slave = bond_get_slave_by_dev(bond, orig_dev);
2471 if (!slave || !slave_do_arp_validate(bond, slave))
2472 goto out_unlock;
2473
2474 /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
2475 if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2476 (2 * dev->addr_len) +
2477 (2 * sizeof(u32)))))
2478 goto out_unlock;
2479
d0a92be0 2480 arp = arp_hdr(skb);
f5b2b966
JV		 2481 if (arp->ar_hln != dev->addr_len ||
2482 skb->pkt_type == PACKET_OTHERHOST ||
2483 skb->pkt_type == PACKET_LOOPBACK ||
2484 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2485 arp->ar_pro != htons(ETH_P_IP) ||
2486 arp->ar_pln != 4)
2487 goto out_unlock;
2488
2489 arp_ptr = (unsigned char *)(arp + 1);
2490 arp_ptr += dev->addr_len;
2491 memcpy(&sip, arp_ptr, 4);
2492 arp_ptr += 4 + dev->addr_len;
2493 memcpy(&tip, arp_ptr, 4);
2494
2495 dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2496 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2497 slave->state, bond->params.arp_validate,
2498 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2499
2500 /*
2501 * Backup slaves won't see the ARP reply, but do come through
2502 * here for each ARP probe (so we swap the sip/tip to validate
2503 * the probe). In a "redundant switch, common router" type of
2504 * configuration, the ARP probe will (hopefully) travel from
2505 * the active, through one switch, the router, then the other
2506 * switch before reaching the backup.
2507 */
2508 if (slave->state == BOND_STATE_ACTIVE)
2509 bond_validate_arp(bond, slave, sip, tip);
2510 else
2511 bond_validate_arp(bond, slave, tip, sip);
2512
2513out_unlock:
2514 read_unlock(&bond->lock);
2515out:
2516 dev_kfree_skb(skb);
2517 return NET_RX_SUCCESS;
2518}
2519
1da177e4
LT		 2520/*
2521 * this function is called regularly to monitor each slave's link
2522 * ensuring that traffic is being sent and received when arp monitoring
2523 * is used in load-balancing mode. if the adapter has been dormant, then an
2524 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2525 * arp monitoring in active backup mode.
2526 */
a77b5325 2527void bond_loadbalance_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2528{
2529 struct bonding *bond = bond_dev->priv;
2530 struct slave *slave, *oldcurrent;
2531 int do_failover = 0;
2532 int delta_in_ticks;
2533 int i;
2534
2535 read_lock(&bond->lock);
2536
2537 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2538
2539 if (bond->kill_timers) {
2540 goto out;
2541 }
2542
2543 if (bond->slave_cnt == 0) {
2544 goto re_arm;
2545 }
2546
2547 read_lock(&bond->curr_slave_lock);
2548 oldcurrent = bond->curr_active_slave;
2549 read_unlock(&bond->curr_slave_lock);
2550
2551 /* see if any of the previous devices are up now (i.e. they have
2552 * xmt and rcv traffic). the curr_active_slave does not come into
2553 * the picture unless it is null. also, slave->jiffies is not needed
2554 * here because we send an arp on each slave and give a slave as
2555 * long as it needs to get the tx/rx within the delta.
2556 * TODO: what about up/down delay in arp mode? it wasn't here before
2557 * so it can wait
2558 */
2559 bond_for_each_slave(bond, slave, i) {
2560 if (slave->link != BOND_LINK_UP) {
2561 if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2562 ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2563
2564 slave->link = BOND_LINK_UP;
2565 slave->state = BOND_STATE_ACTIVE;
2566
2567 /* primary_slave has no meaning in round-robin
2568 * mode. the window of a slave being up and
2569 * curr_active_slave being null after enslaving
2570 * is closed.
2571 */
2572 if (!oldcurrent) {
2573 printk(KERN_INFO DRV_NAME
2574 ": %s: link status definitely "
2575 "up for interface %s, ",
2576 bond_dev->name,
2577 slave->dev->name);
2578 do_failover = 1;
2579 } else {
2580 printk(KERN_INFO DRV_NAME
2581 ": %s: interface %s is now up\n",
2582 bond_dev->name,
2583 slave->dev->name);
2584 }
2585 }
2586 } else {
2587 /* slave->link == BOND_LINK_UP */
2588
2589 /* not all switches will respond to an arp request
2590 * when the source ip is 0, so don't take the link down
2591 * if we don't know our ip yet
2592 */
2593 if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2594 (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
c3ade5ca 2595 bond_has_ip(bond))) {
1da177e4
LT		 2596
2597 slave->link = BOND_LINK_DOWN;
2598 slave->state = BOND_STATE_BACKUP;
2599
2600 if (slave->link_failure_count < UINT_MAX) {
2601 slave->link_failure_count++;
2602 }
2603
2604 printk(KERN_INFO DRV_NAME
2605 ": %s: interface %s is now down.\n",
2606 bond_dev->name,
2607 slave->dev->name);
2608
2609 if (slave == oldcurrent) {
2610 do_failover = 1;
2611 }
2612 }
2613 }
2614
2615 /* note: if switch is in round-robin mode, all links
2616 * must tx arp to ensure all links rx an arp - otherwise
2617 * links may oscillate or not come up at all; if switch is
2618 * in something like xor mode, there is nothing we can
2619 * do - all replies will be rx'ed on same link causing slaves
2620 * to be unstable during low/no traffic periods
2621 */
2622 if (IS_UP(slave->dev)) {
2623 bond_arp_send_all(bond, slave);
2624 }
2625 }
2626
2627 if (do_failover) {
2628 write_lock(&bond->curr_slave_lock);
2629
2630 bond_select_active_slave(bond);
2631
1da177e4
LT		 2632 write_unlock(&bond->curr_slave_lock);
2633 }
2634
2635re_arm:
2636 if (bond->params.arp_interval) {
2637 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2638 }
2639out:
2640 read_unlock(&bond->lock);
2641}
2642
2643/*
2644 * When using arp monitoring in active-backup mode, this function is
2645 * called to determine if any backup slaves have went down or a new
2646 * current slave needs to be found.
2647 * The backup slaves never generate traffic, they are considered up by merely
2648 * receiving traffic. If the current slave goes down, each backup slave will
2649 * be given the opportunity to tx/rx an arp before being taken down - this
2650 * prevents all slaves from being taken down due to the current slave not
2651 * sending any traffic for the backups to receive. The arps are not necessarily
2652 * necessary, any tx and rx traffic will keep the current slave up. While any
2653 * rx traffic will keep the backup slaves up, the current slave is responsible
2654 * for generating traffic to keep them up regardless of any other traffic they
2655 * may have received.
2656 * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2657 */
a77b5325 2658void bond_activebackup_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2659{
2660 struct bonding *bond = bond_dev->priv;
2661 struct slave *slave;
2662 int delta_in_ticks;
2663 int i;
2664
2665 read_lock(&bond->lock);
2666
2667 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2668
2669 if (bond->kill_timers) {
2670 goto out;
2671 }
2672
2673 if (bond->slave_cnt == 0) {
2674 goto re_arm;
2675 }
2676
2677 /* determine if any slave has come up or any backup slave has
2678 * gone down
2679 * TODO: what about up/down delay in arp mode? it wasn't here before
2680 * so it can wait
2681 */
2682 bond_for_each_slave(bond, slave, i) {
2683 if (slave->link != BOND_LINK_UP) {
f5b2b966
JV		 2684 if ((jiffies - slave_last_rx(bond, slave)) <=
2685 delta_in_ticks) {
1da177e4
LT		 2686
2687 slave->link = BOND_LINK_UP;
2688
2689 write_lock(&bond->curr_slave_lock);
2690
2691 if ((!bond->curr_active_slave) &&
2692 ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2693 bond_change_active_slave(bond, slave);
2694 bond->current_arp_slave = NULL;
2695 } else if (bond->curr_active_slave != slave) {
2696 /* this slave has just come up but we
2697 * already have a current slave; this
2698 * can also happen if bond_enslave adds
2699 * a new slave that is up while we are
2700 * searching for a new slave
2701 */
2702 bond_set_slave_inactive_flags(slave);
2703 bond->current_arp_slave = NULL;
2704 }
2705
ff59c456
JV		 2706 bond_set_carrier(bond);
2707
1da177e4
LT		 2708 if (slave == bond->curr_active_slave) {
2709 printk(KERN_INFO DRV_NAME
2710 ": %s: %s is up and now the "
2711 "active interface\n",
2712 bond_dev->name,
2713 slave->dev->name);
ff59c456 2714 netif_carrier_on(bond->dev);
1da177e4
LT		 2715 } else {
2716 printk(KERN_INFO DRV_NAME
2717 ": %s: backup interface %s is "
2718 "now up\n",
2719 bond_dev->name,
2720 slave->dev->name);
2721 }
2722
2723 write_unlock(&bond->curr_slave_lock);
2724 }
2725 } else {
2726 read_lock(&bond->curr_slave_lock);
2727
2728 if ((slave != bond->curr_active_slave) &&
2729 (!bond->current_arp_slave) &&
f5b2b966 2730 (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
c3ade5ca 2731 bond_has_ip(bond))) {
1da177e4
LT		 2732 /* a backup slave has gone down; three times
2733 * the delta allows the current slave to be
2734 * taken out before the backup slave.
2735 * note: a non-null current_arp_slave indicates
2736 * the curr_active_slave went down and we are
2737 * searching for a new one; under this
2738 * condition we only take the curr_active_slave
2739 * down - this gives each slave a chance to
2740 * tx/rx traffic before being taken out
2741 */
2742
2743 read_unlock(&bond->curr_slave_lock);
2744
2745 slave->link = BOND_LINK_DOWN;
2746
2747 if (slave->link_failure_count < UINT_MAX) {
2748 slave->link_failure_count++;
2749 }
2750
2751 bond_set_slave_inactive_flags(slave);
2752
2753 printk(KERN_INFO DRV_NAME
2754 ": %s: backup interface %s is now down\n",
2755 bond_dev->name,
2756 slave->dev->name);
2757 } else {
2758 read_unlock(&bond->curr_slave_lock);
2759 }
2760 }
2761 }
2762
2763 read_lock(&bond->curr_slave_lock);
2764 slave = bond->curr_active_slave;
2765 read_unlock(&bond->curr_slave_lock);
2766
2767 if (slave) {
2768 /* if we have sent traffic in the past 2*arp_intervals but
2769 * haven't xmit and rx traffic in that time interval, select
2770 * a different slave. slave->jiffies is only updated when
2771 * a slave first becomes the curr_active_slave - not necessarily
2772 * after every arp; this ensures the slave has a full 2*delta
2773 * before being taken out. if a primary is being used, check
2774 * if it is up and needs to take over as the curr_active_slave
2775 */
2776 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
f5b2b966 2777 (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
c3ade5ca 2778 bond_has_ip(bond))) &&
1da177e4
LT		 2779 ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2780
2781 slave->link = BOND_LINK_DOWN;
2782
2783 if (slave->link_failure_count < UINT_MAX) {
2784 slave->link_failure_count++;
2785 }
2786
2787 printk(KERN_INFO DRV_NAME
2788 ": %s: link status down for active interface "
2789 "%s, disabling it\n",
2790 bond_dev->name,
2791 slave->dev->name);
2792
2793 write_lock(&bond->curr_slave_lock);
2794
2795 bond_select_active_slave(bond);
2796 slave = bond->curr_active_slave;
2797
2798 write_unlock(&bond->curr_slave_lock);
2799
2800 bond->current_arp_slave = slave;
2801
2802 if (slave) {
2803 slave->jiffies = jiffies;
2804 }
2805 } else if ((bond->primary_slave) &&
2806 (bond->primary_slave != slave) &&
2807 (bond->primary_slave->link == BOND_LINK_UP)) {
2808 /* at this point, slave is the curr_active_slave */
2809 printk(KERN_INFO DRV_NAME
2810 ": %s: changing from interface %s to primary "
2811 "interface %s\n",
2812 bond_dev->name,
2813 slave->dev->name,
2814 bond->primary_slave->dev->name);
2815
2816 /* primary is up so switch to it */
2817 write_lock(&bond->curr_slave_lock);
2818 bond_change_active_slave(bond, bond->primary_slave);
2819 write_unlock(&bond->curr_slave_lock);
2820
2821 slave = bond->primary_slave;
2822 slave->jiffies = jiffies;
2823 } else {
2824 bond->current_arp_slave = NULL;
2825 }
2826
2827 /* the current slave must tx an arp to ensure backup slaves
2828 * rx traffic
2829 */
c3ade5ca 2830 if (slave && bond_has_ip(bond)) {
1da177e4
LT		 2831 bond_arp_send_all(bond, slave);
2832 }
2833 }
2834
2835 /* if we don't have a curr_active_slave, search for the next available
2836 * backup slave from the current_arp_slave and make it the candidate
2837 * for becoming the curr_active_slave
2838 */
2839 if (!slave) {
2840 if (!bond->current_arp_slave) {
2841 bond->current_arp_slave = bond->first_slave;
2842 }
2843
2844 if (bond->current_arp_slave) {
2845 bond_set_slave_inactive_flags(bond->current_arp_slave);
2846
2847 /* search for next candidate */
2f872f04 2848 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
1da177e4
LT		 2849 if (IS_UP(slave->dev)) {
2850 slave->link = BOND_LINK_BACK;
2851 bond_set_slave_active_flags(slave);
2852 bond_arp_send_all(bond, slave);
2853 slave->jiffies = jiffies;
2854 bond->current_arp_slave = slave;
2855 break;
2856 }
2857
2858 /* if the link state is up at this point, we
2859 * mark it down - this can happen if we have
2860 * simultaneous link failures and
2861 * reselect_active_interface doesn't make this
2862 * one the current slave so it is still marked
2863 * up when it is actually down
2864 */
2865 if (slave->link == BOND_LINK_UP) {
2866 slave->link = BOND_LINK_DOWN;
2867 if (slave->link_failure_count < UINT_MAX) {
2868 slave->link_failure_count++;
2869 }
2870
2871 bond_set_slave_inactive_flags(slave);
2872
2873 printk(KERN_INFO DRV_NAME
2874 ": %s: backup interface %s is "
2875 "now down.\n",
2876 bond_dev->name,
2877 slave->dev->name);
2878 }
2879 }
2880 }
2881 }
2882
2883re_arm:
2884 if (bond->params.arp_interval) {
2885 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2886 }
2887out:
2888 read_unlock(&bond->lock);
2889}
2890
2891/*------------------------------ proc/seq_file-------------------------------*/
2892
2893#ifdef CONFIG_PROC_FS
2894
2895#define SEQ_START_TOKEN ((void *)1)
2896
2897static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2898{
2899 struct bonding *bond = seq->private;
2900 loff_t off = 0;
2901 struct slave *slave;
2902 int i;
2903
2904 /* make sure the bond won't be taken away */
2905 read_lock(&dev_base_lock);
2906 read_lock_bh(&bond->lock);
2907
2908 if (*pos == 0) {
2909 return SEQ_START_TOKEN;
2910 }
2911
2912 bond_for_each_slave(bond, slave, i) {
2913 if (++off == *pos) {
2914 return slave;
2915 }
2916 }
2917
2918 return NULL;
2919}
2920
2921static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2922{
2923 struct bonding *bond = seq->private;
2924 struct slave *slave = v;
2925
2926 ++*pos;
2927 if (v == SEQ_START_TOKEN) {
2928 return bond->first_slave;
2929 }
2930
2931 slave = slave->next;
2932
2933 return (slave == bond->first_slave) ? NULL : slave;
2934}
2935
2936static void bond_info_seq_stop(struct seq_file *seq, void *v)
2937{
2938 struct bonding *bond = seq->private;
2939
2940 read_unlock_bh(&bond->lock);
2941 read_unlock(&dev_base_lock);
2942}
2943
2944static void bond_info_show_master(struct seq_file *seq)
2945{
2946 struct bonding *bond = seq->private;
2947 struct slave *curr;
4756b02f
MW		 2948 int i;
2949 u32 target;
1da177e4
LT		 2950
2951 read_lock(&bond->curr_slave_lock);
2952 curr = bond->curr_active_slave;
2953 read_unlock(&bond->curr_slave_lock);
2954
2955 seq_printf(seq, "Bonding Mode: %s\n",
2956 bond_mode_name(bond->params.mode));
2957
c61b75ad
MW		 2958 if (bond->params.mode == BOND_MODE_XOR ||
2959 bond->params.mode == BOND_MODE_8023AD) {
2960 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2961 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2962 bond->params.xmit_policy);
2963 }
2964
1da177e4
LT		 2965 if (USES_PRIMARY(bond->params.mode)) {
2966 seq_printf(seq, "Primary Slave: %s\n",
0f418b2a
MW		 2967 (bond->primary_slave) ?
2968 bond->primary_slave->dev->name : "None");
1da177e4
LT		 2969
2970 seq_printf(seq, "Currently Active Slave: %s\n",
2971 (curr) ? curr->dev->name : "None");
2972 }
2973
ff59c456
JV		 2974 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2975 "up" : "down");
1da177e4
LT		 2976 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2977 seq_printf(seq, "Up Delay (ms): %d\n",
2978 bond->params.updelay * bond->params.miimon);
2979 seq_printf(seq, "Down Delay (ms): %d\n",
2980 bond->params.downdelay * bond->params.miimon);
2981
4756b02f
MW		 2982
2983 /* ARP information */
2984 if(bond->params.arp_interval > 0) {
2985 int printed=0;
2986 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2987 bond->params.arp_interval);
2988
2989 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2990
2991 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2992 if (!bond->params.arp_targets[i])
2993 continue;
2994 if (printed)
2995 seq_printf(seq, ",");
2996 target = ntohl(bond->params.arp_targets[i]);
2997 seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
2998 printed = 1;
2999 }
3000 seq_printf(seq, "\n");
3001 }
3002
1da177e4
LT		 3003 if (bond->params.mode == BOND_MODE_8023AD) {
3004 struct ad_info ad_info;
3005
3006 seq_puts(seq, "\n802.3ad info\n");
3007 seq_printf(seq, "LACP rate: %s\n",
3008 (bond->params.lacp_fast) ? "fast" : "slow");
3009
3010 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3011 seq_printf(seq, "bond %s has no active aggregator\n",
3012 bond->dev->name);
3013 } else {
3014 seq_printf(seq, "Active Aggregator Info:\n");
3015
3016 seq_printf(seq, "\tAggregator ID: %d\n",
3017 ad_info.aggregator_id);
3018 seq_printf(seq, "\tNumber of ports: %d\n",
3019 ad_info.ports);
3020 seq_printf(seq, "\tActor Key: %d\n",
3021 ad_info.actor_key);
3022 seq_printf(seq, "\tPartner Key: %d\n",
3023 ad_info.partner_key);
3024 seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
3025 ad_info.partner_system[0],
3026 ad_info.partner_system[1],
3027 ad_info.partner_system[2],
3028 ad_info.partner_system[3],
3029 ad_info.partner_system[4],
3030 ad_info.partner_system[5]);
3031 }
3032 }
3033}
3034
3035static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3036{
3037 struct bonding *bond = seq->private;
3038
3039 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3040 seq_printf(seq, "MII Status: %s\n",
3041 (slave->link == BOND_LINK_UP) ? "up" : "down");
65509645 3042 seq_printf(seq, "Link Failure Count: %u\n",
1da177e4
LT		 3043 slave->link_failure_count);
3044
217df670
JV		 3045 seq_printf(seq,
3046 "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
3047 slave->perm_hwaddr[0], slave->perm_hwaddr[1],
3048 slave->perm_hwaddr[2], slave->perm_hwaddr[3],
3049 slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
1da177e4
LT		 3050
3051 if (bond->params.mode == BOND_MODE_8023AD) {
3052 const struct aggregator *agg
3053 = SLAVE_AD_INFO(slave).port.aggregator;
3054
3055 if (agg) {
3056 seq_printf(seq, "Aggregator ID: %d\n",
3057 agg->aggregator_identifier);
3058 } else {
3059 seq_puts(seq, "Aggregator ID: N/A\n");
3060 }
3061 }
3062}
3063
3064static int bond_info_seq_show(struct seq_file *seq, void *v)
3065{
3066 if (v == SEQ_START_TOKEN) {
3067 seq_printf(seq, "%s\n", version);
3068 bond_info_show_master(seq);
3069 } else {
3070 bond_info_show_slave(seq, v);
3071 }
3072
3073 return 0;
3074}
3075
3076static struct seq_operations bond_info_seq_ops = {
3077 .start = bond_info_seq_start,
3078 .next = bond_info_seq_next,
3079 .stop = bond_info_seq_stop,
3080 .show = bond_info_seq_show,
3081};
3082
3083static int bond_info_open(struct inode *inode, struct file *file)
3084{
3085 struct seq_file *seq;
3086 struct proc_dir_entry *proc;
3087 int res;
3088
3089 res = seq_open(file, &bond_info_seq_ops);
3090 if (!res) {
3091 /* recover the pointer buried in proc_dir_entry data */
3092 seq = file->private_data;
3093 proc = PDE(inode);
3094 seq->private = proc->data;
3095 }
3096
3097 return res;
3098}
3099
d54b1fdb 3100static const struct file_operations bond_info_fops = {
1da177e4
LT		 3101 .owner = THIS_MODULE,
3102 .open = bond_info_open,
3103 .read = seq_read,
3104 .llseek = seq_lseek,
3105 .release = seq_release,
3106};
3107
3108static int bond_create_proc_entry(struct bonding *bond)
3109{
3110 struct net_device *bond_dev = bond->dev;
3111
3112 if (bond_proc_dir) {
3113 bond->proc_entry = create_proc_entry(bond_dev->name,
3114 S_IRUGO,
3115 bond_proc_dir);
3116 if (bond->proc_entry == NULL) {
3117 printk(KERN_WARNING DRV_NAME
3118 ": Warning: Cannot create /proc/net/%s/%s\n",
3119 DRV_NAME, bond_dev->name);
3120 } else {
3121 bond->proc_entry->data = bond;
3122 bond->proc_entry->proc_fops = &bond_info_fops;
3123 bond->proc_entry->owner = THIS_MODULE;
3124 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3125 }
3126 }
3127
3128 return 0;
3129}
3130
3131static void bond_remove_proc_entry(struct bonding *bond)
3132{
3133 if (bond_proc_dir && bond->proc_entry) {
3134 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3135 memset(bond->proc_file_name, 0, IFNAMSIZ);
3136 bond->proc_entry = NULL;
3137 }
3138}
3139
3140/* Create the bonding directory under /proc/net, if doesn't exist yet.
3141 * Caller must hold rtnl_lock.
3142 */
3143static void bond_create_proc_dir(void)
3144{
3145 int len = strlen(DRV_NAME);
3146
3147 for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
3148 bond_proc_dir = bond_proc_dir->next) {
3149 if ((bond_proc_dir->namelen == len) &&
3150 !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3151 break;
3152 }
3153 }
3154
3155 if (!bond_proc_dir) {
3156 bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
3157 if (bond_proc_dir) {
3158 bond_proc_dir->owner = THIS_MODULE;
3159 } else {
3160 printk(KERN_WARNING DRV_NAME
3161 ": Warning: cannot create /proc/net/%s\n",
3162 DRV_NAME);
3163 }
3164 }
3165}
3166
3167/* Destroy the bonding directory under /proc/net, if empty.
3168 * Caller must hold rtnl_lock.
3169 */
3170static void bond_destroy_proc_dir(void)
3171{
3172 struct proc_dir_entry *de;
3173
3174 if (!bond_proc_dir) {
3175 return;
3176 }
3177
3178 /* verify that the /proc dir is empty */
3179 for (de = bond_proc_dir->subdir; de; de = de->next) {
3180 /* ignore . and .. */
3181 if (*(de->name) != '.') {
3182 break;
3183 }
3184 }
3185
3186 if (de) {
3187 if (bond_proc_dir->owner == THIS_MODULE) {
3188 bond_proc_dir->owner = NULL;
3189 }
3190 } else {
3191 remove_proc_entry(DRV_NAME, proc_net);
3192 bond_proc_dir = NULL;
3193 }
3194}
3195#endif /* CONFIG_PROC_FS */
3196
3197/*-------------------------- netdev event handling --------------------------*/
3198
3199/*
3200 * Change device name
3201 */
3202static int bond_event_changename(struct bonding *bond)
3203{
3204#ifdef CONFIG_PROC_FS
3205 bond_remove_proc_entry(bond);
3206 bond_create_proc_entry(bond);
3207#endif
b76cdba9
MW		 3208 down_write(&(bonding_rwsem));
3209 bond_destroy_sysfs_entry(bond);
3210 bond_create_sysfs_entry(bond);
3211 up_write(&(bonding_rwsem));
1da177e4
LT		 3212 return NOTIFY_DONE;
3213}
3214
3215static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3216{
3217 struct bonding *event_bond = bond_dev->priv;
3218
3219 switch (event) {
3220 case NETDEV_CHANGENAME:
3221 return bond_event_changename(event_bond);
3222 case NETDEV_UNREGISTER:
3223 /*
3224 * TODO: remove a bond from the list?
3225 */
3226 break;
3227 default:
3228 break;
3229 }
3230
3231 return NOTIFY_DONE;
3232}
3233
3234static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3235{
3236 struct net_device *bond_dev = slave_dev->master;
8531c5ff 3237 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3238
3239 switch (event) {
3240 case NETDEV_UNREGISTER:
3241 if (bond_dev) {
3242 bond_release(bond_dev, slave_dev);
3243 }
3244 break;
3245 case NETDEV_CHANGE:
3246 /*
3247 * TODO: is this what we get if somebody
3248 * sets up a hierarchical bond, then rmmod's
3249 * one of the slave bonding devices?
3250 */
3251 break;
3252 case NETDEV_DOWN:
3253 /*
3254 * ... Or is it this?
3255 */
3256 break;
3257 case NETDEV_CHANGEMTU:
3258 /*
3259 * TODO: Should slaves be allowed to
3260 * independently alter their MTU? For
3261 * an active-backup bond, slaves need
3262 * not be the same type of device, so
3263 * MTUs may vary. For other modes,
3264 * slaves arguably should have the
3265 * same MTUs. To do this, we'd need to
3266 * take over the slave's change_mtu
3267 * function for the duration of their
3268 * servitude.
3269 */
3270 break;
3271 case NETDEV_CHANGENAME:
3272 /*
3273 * TODO: handle changing the primary's name
3274 */
3275 break;
8531c5ff
AK		 3276 case NETDEV_FEAT_CHANGE:
3277 bond_compute_features(bond);
3278 break;
1da177e4
LT		 3279 default:
3280 break;
3281 }
3282
3283 return NOTIFY_DONE;
3284}
3285
3286/*
3287 * bond_netdev_event: handle netdev notifier chain events.
3288 *
3289 * This function receives events for the netdev chain. The caller (an
e041c683 3290 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
1da177e4
LT		 3291 * locks for us to safely manipulate the slave devices (RTNL lock,
3292 * dev_probe_lock).
3293 */
3294static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3295{
3296 struct net_device *event_dev = (struct net_device *)ptr;
3297
3298 dprintk("event_dev: %s, event: %lx\n",
3299 (event_dev ? event_dev->name : "None"),
3300 event);
3301
0b680e75
JV		 3302 if (!(event_dev->priv_flags & IFF_BONDING))
3303 return NOTIFY_DONE;
3304
1da177e4
LT		 3305 if (event_dev->flags & IFF_MASTER) {
3306 dprintk("IFF_MASTER\n");
3307 return bond_master_netdev_event(event, event_dev);
3308 }
3309
3310 if (event_dev->flags & IFF_SLAVE) {
3311 dprintk("IFF_SLAVE\n");
3312 return bond_slave_netdev_event(event, event_dev);
3313 }
3314
3315 return NOTIFY_DONE;
3316}
3317
c3ade5ca
JV		 3318/*
3319 * bond_inetaddr_event: handle inetaddr notifier chain events.
3320 *
3321 * We keep track of device IPs primarily to use as source addresses in
3322 * ARP monitor probes (rather than spewing out broadcasts all the time).
3323 *
3324 * We track one IP for the main device (if it has one), plus one per VLAN.
3325 */
3326static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3327{
3328 struct in_ifaddr *ifa = ptr;
3329 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3330 struct bonding *bond, *bond_next;
3331 struct vlan_entry *vlan, *vlan_next;
3332
3333 list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3334 if (bond->dev == event_dev) {
3335 switch (event) {
3336 case NETDEV_UP:
3337 bond->master_ip = ifa->ifa_local;
3338 return NOTIFY_OK;
3339 case NETDEV_DOWN:
3340 bond->master_ip = bond_glean_dev_ip(bond->dev);
3341 return NOTIFY_OK;
3342 default:
3343 return NOTIFY_DONE;
3344 }
3345 }
3346
3347 if (list_empty(&bond->vlan_list))
3348 continue;
3349
3350 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3351 vlan_list) {
5c15bdec 3352 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 3353 if (vlan_dev == event_dev) {
3354 switch (event) {
3355 case NETDEV_UP:
3356 vlan->vlan_ip = ifa->ifa_local;
3357 return NOTIFY_OK;
3358 case NETDEV_DOWN:
3359 vlan->vlan_ip =
3360 bond_glean_dev_ip(vlan_dev);
3361 return NOTIFY_OK;
3362 default:
3363 return NOTIFY_DONE;
3364 }
3365 }
3366 }
3367 }
3368 return NOTIFY_DONE;
3369}
3370
1da177e4
LT		 3371static struct notifier_block bond_netdev_notifier = {
3372 .notifier_call = bond_netdev_event,
3373};
3374
c3ade5ca
JV		 3375static struct notifier_block bond_inetaddr_notifier = {
3376 .notifier_call = bond_inetaddr_event,
3377};
3378
1da177e4
LT		 3379/*-------------------------- Packet type handling ---------------------------*/
3380
3381/* register to receive lacpdus on a bond */
3382static void bond_register_lacpdu(struct bonding *bond)
3383{
3384 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3385
3386 /* initialize packet type */
3387 pk_type->type = PKT_TYPE_LACPDU;
3388 pk_type->dev = bond->dev;
3389 pk_type->func = bond_3ad_lacpdu_recv;
3390
3391 dev_add_pack(pk_type);
3392}
3393
3394/* unregister to receive lacpdus on a bond */
3395static void bond_unregister_lacpdu(struct bonding *bond)
3396{
3397 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3398}
3399
f5b2b966
JV		 3400void bond_register_arp(struct bonding *bond)
3401{
3402 struct packet_type *pt = &bond->arp_mon_pt;
3403
c4f283b1
JV		 3404 if (pt->type)
3405 return;
3406
f5b2b966 3407 pt->type = htons(ETH_P_ARP);
e245cb71 3408 pt->dev = bond->dev;
f5b2b966
JV		 3409 pt->func = bond_arp_rcv;
3410 dev_add_pack(pt);
3411}
3412
3413void bond_unregister_arp(struct bonding *bond)
3414{
c4f283b1
JV		 3415 struct packet_type *pt = &bond->arp_mon_pt;
3416
3417 dev_remove_pack(pt);
3418 pt->type = 0;
f5b2b966
JV		 3419}
3420
169a3e66
JV		 3421/*---------------------------- Hashing Policies -----------------------------*/
3422
3423/*
59c51591 3424 * Hash for the output device based upon layer 3 and layer 4 data. If
169a3e66
JV		 3425 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3426 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3427 */
3428static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3429 struct net_device *bond_dev, int count)
3430{
3431 struct ethhdr *data = (struct ethhdr *)skb->data;
eddc9ec5 3432 struct iphdr *iph = ip_hdr(skb);
169a3e66
JV		 3433 u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3434 int layer4_xor = 0;
3435
3436 if (skb->protocol == __constant_htons(ETH_P_IP)) {
3437 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3438 (iph->protocol == IPPROTO_TCP ||
3439 iph->protocol == IPPROTO_UDP)) {
3440 layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3441 }
3442 return (layer4_xor ^
3443 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3444
3445 }
3446
3447 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3448}
3449
3450/*
3451 * Hash for the output device based upon layer 2 data
3452 */
3453static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3454 struct net_device *bond_dev, int count)
3455{
3456 struct ethhdr *data = (struct ethhdr *)skb->data;
3457
3458 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3459}
3460
1da177e4
LT		 3461/*-------------------------- Device entry points ----------------------------*/
3462
3463static int bond_open(struct net_device *bond_dev)
3464{
3465 struct bonding *bond = bond_dev->priv;
3466 struct timer_list *mii_timer = &bond->mii_timer;
3467 struct timer_list *arp_timer = &bond->arp_timer;
3468
3469 bond->kill_timers = 0;
3470
3471 if ((bond->params.mode == BOND_MODE_TLB) ||
3472 (bond->params.mode == BOND_MODE_ALB)) {
3473 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3474
3475 /* bond_alb_initialize must be called before the timer
3476 * is started.
3477 */
3478 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3479 /* something went wrong - fail the open operation */
3480 return -1;
3481 }
3482
3483 init_timer(alb_timer);
3484 alb_timer->expires = jiffies + 1;
3485 alb_timer->data = (unsigned long)bond;
3486 alb_timer->function = (void *)&bond_alb_monitor;
3487 add_timer(alb_timer);
3488 }
3489
3490 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3491 init_timer(mii_timer);
3492 mii_timer->expires = jiffies + 1;
3493 mii_timer->data = (unsigned long)bond_dev;
3494 mii_timer->function = (void *)&bond_mii_monitor;
3495 add_timer(mii_timer);
3496 }
3497
3498 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3499 init_timer(arp_timer);
3500 arp_timer->expires = jiffies + 1;
3501 arp_timer->data = (unsigned long)bond_dev;
3502 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3503 arp_timer->function = (void *)&bond_activebackup_arp_mon;
3504 } else {
3505 arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3506 }
f5b2b966
JV		 3507 if (bond->params.arp_validate)
3508 bond_register_arp(bond);
3509
1da177e4
LT		 3510 add_timer(arp_timer);
3511 }
3512
3513 if (bond->params.mode == BOND_MODE_8023AD) {
3514 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3515 init_timer(ad_timer);
3516 ad_timer->expires = jiffies + 1;
3517 ad_timer->data = (unsigned long)bond;
3518 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3519 add_timer(ad_timer);
3520
3521 /* register to receive LACPDUs */
3522 bond_register_lacpdu(bond);
3523 }
3524
3525 return 0;
3526}
3527
3528static int bond_close(struct net_device *bond_dev)
3529{
3530 struct bonding *bond = bond_dev->priv;
3531
3532 if (bond->params.mode == BOND_MODE_8023AD) {
3533 /* Unregister the receive of LACPDUs */
3534 bond_unregister_lacpdu(bond);
3535 }
3536
f5b2b966
JV		 3537 if (bond->params.arp_validate)
3538 bond_unregister_arp(bond);
3539
1da177e4
LT		 3540 write_lock_bh(&bond->lock);
3541
1da177e4
LT		 3542
3543 /* signal timers not to re-arm */
3544 bond->kill_timers = 1;
3545
3546 write_unlock_bh(&bond->lock);
3547
3548 /* del_timer_sync must run without holding the bond->lock
3549 * because a running timer might be trying to hold it too
3550 */
3551
3552 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3553 del_timer_sync(&bond->mii_timer);
3554 }
3555
3556 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3557 del_timer_sync(&bond->arp_timer);
3558 }
3559
3560 switch (bond->params.mode) {
3561 case BOND_MODE_8023AD:
3562 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3563 break;
3564 case BOND_MODE_TLB:
3565 case BOND_MODE_ALB:
3566 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3567 break;
3568 default:
3569 break;
3570 }
3571
1da177e4
LT		 3572
3573 if ((bond->params.mode == BOND_MODE_TLB) ||
3574 (bond->params.mode == BOND_MODE_ALB)) {
3575 /* Must be called only after all
3576 * slaves have been released
3577 */
3578 bond_alb_deinitialize(bond);
3579 }
3580
3581 return 0;
3582}
3583
3584static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3585{
3586 struct bonding *bond = bond_dev->priv;
3587 struct net_device_stats *stats = &(bond->stats), *sstats;
3588 struct slave *slave;
3589 int i;
3590
3591 memset(stats, 0, sizeof(struct net_device_stats));
3592
3593 read_lock_bh(&bond->lock);
3594
3595 bond_for_each_slave(bond, slave, i) {
c45d286e 3596 sstats = slave->dev->get_stats(slave->dev);
5a1b5898
RR		 3597 stats->rx_packets += sstats->rx_packets;
3598 stats->rx_bytes += sstats->rx_bytes;
3599 stats->rx_errors += sstats->rx_errors;
3600 stats->rx_dropped += sstats->rx_dropped;
3601
3602 stats->tx_packets += sstats->tx_packets;
3603 stats->tx_bytes += sstats->tx_bytes;
3604 stats->tx_errors += sstats->tx_errors;
3605 stats->tx_dropped += sstats->tx_dropped;
3606
3607 stats->multicast += sstats->multicast;
3608 stats->collisions += sstats->collisions;
3609
3610 stats->rx_length_errors += sstats->rx_length_errors;
3611 stats->rx_over_errors += sstats->rx_over_errors;
3612 stats->rx_crc_errors += sstats->rx_crc_errors;
3613 stats->rx_frame_errors += sstats->rx_frame_errors;
3614 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3615 stats->rx_missed_errors += sstats->rx_missed_errors;
3616
3617 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3618 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3619 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3620 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3621 stats->tx_window_errors += sstats->tx_window_errors;
1da177e4
LT		 3622 }
3623
3624 read_unlock_bh(&bond->lock);
3625
3626 return stats;
3627}
3628
3629static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3630{
3631 struct net_device *slave_dev = NULL;
3632 struct ifbond k_binfo;
3633 struct ifbond __user *u_binfo = NULL;
3634 struct ifslave k_sinfo;
3635 struct ifslave __user *u_sinfo = NULL;
3636 struct mii_ioctl_data *mii = NULL;
1da177e4
LT		 3637 int res = 0;
3638
3639 dprintk("bond_ioctl: master=%s, cmd=%d\n",
3640 bond_dev->name, cmd);
3641
3642 switch (cmd) {
1da177e4
LT		 3643 case SIOCGMIIPHY:
3644 mii = if_mii(ifr);
3645 if (!mii) {
3646 return -EINVAL;
3647 }
3648 mii->phy_id = 0;
3649 /* Fall Through */
3650 case SIOCGMIIREG:
3651 /*
3652 * We do this again just in case we were called by SIOCGMIIREG
3653 * instead of SIOCGMIIPHY.
3654 */
3655 mii = if_mii(ifr);
3656 if (!mii) {
3657 return -EINVAL;
3658 }
3659
3660 if (mii->reg_num == 1) {
3661 struct bonding *bond = bond_dev->priv;
3662 mii->val_out = 0;
3663 read_lock_bh(&bond->lock);
3664 read_lock(&bond->curr_slave_lock);
4e140079 3665 if (netif_carrier_ok(bond->dev)) {
1da177e4
LT		 3666 mii->val_out = BMSR_LSTATUS;
3667 }
3668 read_unlock(&bond->curr_slave_lock);
3669 read_unlock_bh(&bond->lock);
3670 }
3671
3672 return 0;
3673 case BOND_INFO_QUERY_OLD:
3674 case SIOCBONDINFOQUERY:
3675 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3676
3677 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3678 return -EFAULT;
3679 }
3680
3681 res = bond_info_query(bond_dev, &k_binfo);
3682 if (res == 0) {
3683 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3684 return -EFAULT;
3685 }
3686 }
3687
3688 return res;
3689 case BOND_SLAVE_INFO_QUERY_OLD:
3690 case SIOCBONDSLAVEINFOQUERY:
3691 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3692
3693 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3694 return -EFAULT;
3695 }
3696
3697 res = bond_slave_info_query(bond_dev, &k_sinfo);
3698 if (res == 0) {
3699 if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3700 return -EFAULT;
3701 }
3702 }
3703
3704 return res;
3705 default:
3706 /* Go on */
3707 break;
3708 }
3709
3710 if (!capable(CAP_NET_ADMIN)) {
3711 return -EPERM;
3712 }
3713
b76cdba9 3714 down_write(&(bonding_rwsem));
1da177e4
LT		 3715 slave_dev = dev_get_by_name(ifr->ifr_slave);
3716
3717 dprintk("slave_dev=%p: \n", slave_dev);
3718
3719 if (!slave_dev) {
3720 res = -ENODEV;
3721 } else {
3722 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3723 switch (cmd) {
3724 case BOND_ENSLAVE_OLD:
3725 case SIOCBONDENSLAVE:
3726 res = bond_enslave(bond_dev, slave_dev);
3727 break;
3728 case BOND_RELEASE_OLD:
3729 case SIOCBONDRELEASE:
3730 res = bond_release(bond_dev, slave_dev);
3731 break;
3732 case BOND_SETHWADDR_OLD:
3733 case SIOCBONDSETHWADDR:
3734 res = bond_sethwaddr(bond_dev, slave_dev);
3735 break;
3736 case BOND_CHANGE_ACTIVE_OLD:
3737 case SIOCBONDCHANGEACTIVE:
3738 res = bond_ioctl_change_active(bond_dev, slave_dev);
3739 break;
3740 default:
3741 res = -EOPNOTSUPP;
3742 }
3743
3744 dev_put(slave_dev);
3745 }
3746
b76cdba9 3747 up_write(&(bonding_rwsem));
1da177e4
LT		 3748 return res;
3749}
3750
3751static void bond_set_multicast_list(struct net_device *bond_dev)
3752{
3753 struct bonding *bond = bond_dev->priv;
3754 struct dev_mc_list *dmi;
3755
3756 write_lock_bh(&bond->lock);
3757
3758 /*
3759 * Do promisc before checking multicast_mode
3760 */
3761 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3762 bond_set_promiscuity(bond, 1);
3763 }
3764
3765 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3766 bond_set_promiscuity(bond, -1);
3767 }
3768
3769 /* set allmulti flag to slaves */
3770 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3771 bond_set_allmulti(bond, 1);
3772 }
3773
3774 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3775 bond_set_allmulti(bond, -1);
3776 }
3777
3778 bond->flags = bond_dev->flags;
3779
3780 /* looking for addresses to add to slaves' mc list */
3781 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3782 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3783 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3784 }
3785 }
3786
3787 /* looking for addresses to delete from slaves' list */
3788 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3789 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3790 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3791 }
3792 }
3793
3794 /* save master's multicast list */
3795 bond_mc_list_destroy(bond);
3796 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3797
3798 write_unlock_bh(&bond->lock);
3799}
3800
3801/*
3802 * Change the MTU of all of a master's slaves to match the master
3803 */
3804static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3805{
3806 struct bonding *bond = bond_dev->priv;
3807 struct slave *slave, *stop_at;
3808 int res = 0;
3809 int i;
3810
3811 dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3812 (bond_dev ? bond_dev->name : "None"), new_mtu);
3813
3814 /* Can't hold bond->lock with bh disabled here since
3815 * some base drivers panic. On the other hand we can't
3816 * hold bond->lock without bh disabled because we'll
3817 * deadlock. The only solution is to rely on the fact
3818 * that we're under rtnl_lock here, and the slaves
3819 * list won't change. This doesn't solve the problem
3820 * of setting the slave's MTU while it is
3821 * transmitting, but the assumption is that the base
3822 * driver can handle that.
3823 *
3824 * TODO: figure out a way to safely iterate the slaves
3825 * list, but without holding a lock around the actual
3826 * call to the base driver.
3827 */
3828
3829 bond_for_each_slave(bond, slave, i) {
3830 dprintk("s %p s->p %p c_m %p\n", slave,
3831 slave->prev, slave->dev->change_mtu);
e944ef79 3832
1da177e4
LT		 3833 res = dev_set_mtu(slave->dev, new_mtu);
3834
3835 if (res) {
3836 /* If we failed to set the slave's mtu to the new value
3837 * we must abort the operation even in ACTIVE_BACKUP
3838 * mode, because if we allow the backup slaves to have
3839 * different mtu values than the active slave we'll
3840 * need to change their mtu when doing a failover. That
3841 * means changing their mtu from timer context, which
3842 * is probably not a good idea.
3843 */
3844 dprintk("err %d %s\n", res, slave->dev->name);
3845 goto unwind;
3846 }
3847 }
3848
3849 bond_dev->mtu = new_mtu;
3850
3851 return 0;
3852
3853unwind:
3854 /* unwind from head to the slave that failed */
3855 stop_at = slave;
3856 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3857 int tmp_res;
3858
3859 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3860 if (tmp_res) {
3861 dprintk("unwind err %d dev %s\n", tmp_res,
3862 slave->dev->name);
3863 }
3864 }
3865
3866 return res;
3867}
3868
3869/*
3870 * Change HW address
3871 *
3872 * Note that many devices must be down to change the HW address, and
3873 * downing the master releases all slaves. We can make bonds full of
3874 * bonding devices to test this, however.
3875 */
3876static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3877{
3878 struct bonding *bond = bond_dev->priv;
3879 struct sockaddr *sa = addr, tmp_sa;
3880 struct slave *slave, *stop_at;
3881 int res = 0;
3882 int i;
3883
3884 dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3885
3886 if (!is_valid_ether_addr(sa->sa_data)) {
3887 return -EADDRNOTAVAIL;
3888 }
3889
3890 /* Can't hold bond->lock with bh disabled here since
3891 * some base drivers panic. On the other hand we can't
3892 * hold bond->lock without bh disabled because we'll
3893 * deadlock. The only solution is to rely on the fact
3894 * that we're under rtnl_lock here, and the slaves
3895 * list won't change. This doesn't solve the problem
3896 * of setting the slave's hw address while it is
3897 * transmitting, but the assumption is that the base
3898 * driver can handle that.
3899 *
3900 * TODO: figure out a way to safely iterate the slaves
3901 * list, but without holding a lock around the actual
3902 * call to the base driver.
3903 */
3904
3905 bond_for_each_slave(bond, slave, i) {
3906 dprintk("slave %p %s\n", slave, slave->dev->name);
3907
3908 if (slave->dev->set_mac_address == NULL) {
3909 res = -EOPNOTSUPP;
3910 dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3911 goto unwind;
3912 }
3913
3914 res = dev_set_mac_address(slave->dev, addr);
3915 if (res) {
3916 /* TODO: consider downing the slave
3917 * and retry ?
3918 * User should expect communications
3919 * breakage anyway until ARP finish
3920 * updating, so...
3921 */
3922 dprintk("err %d %s\n", res, slave->dev->name);
3923 goto unwind;
3924 }
3925 }
3926
3927 /* success */
3928 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3929 return 0;
3930
3931unwind:
3932 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3933 tmp_sa.sa_family = bond_dev->type;
3934
3935 /* unwind from head to the slave that failed */
3936 stop_at = slave;
3937 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3938 int tmp_res;
3939
3940 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3941 if (tmp_res) {
3942 dprintk("unwind err %d dev %s\n", tmp_res,
3943 slave->dev->name);
3944 }
3945 }
3946
3947 return res;
3948}
3949
3950static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3951{
3952 struct bonding *bond = bond_dev->priv;
3953 struct slave *slave, *start_at;
3954 int i;
3955 int res = 1;
3956
3957 read_lock(&bond->lock);
3958
3959 if (!BOND_IS_OK(bond)) {
3960 goto out;
3961 }
3962
3963 read_lock(&bond->curr_slave_lock);
3964 slave = start_at = bond->curr_active_slave;
3965 read_unlock(&bond->curr_slave_lock);
3966
3967 if (!slave) {
3968 goto out;
3969 }
3970
3971 bond_for_each_slave_from(bond, slave, i, start_at) {
3972 if (IS_UP(slave->dev) &&
3973 (slave->link == BOND_LINK_UP) &&
3974 (slave->state == BOND_STATE_ACTIVE)) {
3975 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3976
3977 write_lock(&bond->curr_slave_lock);
3978 bond->curr_active_slave = slave->next;
3979 write_unlock(&bond->curr_slave_lock);
3980
3981 break;
3982 }
3983 }
3984
3985
3986out:
3987 if (res) {
3988 /* no suitable interface, frame not sent */
3989 dev_kfree_skb(skb);
3990 }
3991 read_unlock(&bond->lock);
3992 return 0;
3993}
3994
075897ce 3995
1da177e4
LT		 3996/*
3997 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3998 * the bond has a usable interface.
3999 */
4000static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4001{
4002 struct bonding *bond = bond_dev->priv;
4003 int res = 1;
4004
1da177e4
LT		 4005 read_lock(&bond->lock);
4006 read_lock(&bond->curr_slave_lock);
4007
4008 if (!BOND_IS_OK(bond)) {
4009 goto out;
4010 }
4011
075897ce
JL		 4012 if (!bond->curr_active_slave)
4013 goto out;
4014
075897ce
JL		 4015 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4016
1da177e4
LT		 4017out:
4018 if (res) {
4019 /* no suitable interface, frame not sent */
4020 dev_kfree_skb(skb);
4021 }
4022 read_unlock(&bond->curr_slave_lock);
4023 read_unlock(&bond->lock);
4024 return 0;
4025}
4026
4027/*
169a3e66
JV		 4028 * In bond_xmit_xor() , we determine the output device by using a pre-
4029 * determined xmit_hash_policy(), If the selected device is not enabled,
4030 * find the next active slave.
1da177e4
LT		 4031 */
4032static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4033{
4034 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 4035 struct slave *slave, *start_at;
4036 int slave_no;
4037 int i;
4038 int res = 1;
4039
4040 read_lock(&bond->lock);
4041
4042 if (!BOND_IS_OK(bond)) {
4043 goto out;
4044 }
4045
169a3e66 4046 slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
1da177e4
LT		 4047
4048 bond_for_each_slave(bond, slave, i) {
4049 slave_no--;
4050 if (slave_no < 0) {
4051 break;
4052 }
4053 }
4054
4055 start_at = slave;
4056
4057 bond_for_each_slave_from(bond, slave, i, start_at) {
4058 if (IS_UP(slave->dev) &&
4059 (slave->link == BOND_LINK_UP) &&
4060 (slave->state == BOND_STATE_ACTIVE)) {
4061 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4062 break;
4063 }
4064 }
4065
4066out:
4067 if (res) {
4068 /* no suitable interface, frame not sent */
4069 dev_kfree_skb(skb);
4070 }
4071 read_unlock(&bond->lock);
4072 return 0;
4073}
4074
4075/*
4076 * in broadcast mode, we send everything to all usable interfaces.
4077 */
4078static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4079{
4080 struct bonding *bond = bond_dev->priv;
4081 struct slave *slave, *start_at;
4082 struct net_device *tx_dev = NULL;
4083 int i;
4084 int res = 1;
4085
4086 read_lock(&bond->lock);
4087
4088 if (!BOND_IS_OK(bond)) {
4089 goto out;
4090 }
4091
4092 read_lock(&bond->curr_slave_lock);
4093 start_at = bond->curr_active_slave;
4094 read_unlock(&bond->curr_slave_lock);
4095
4096 if (!start_at) {
4097 goto out;
4098 }
4099
4100 bond_for_each_slave_from(bond, slave, i, start_at) {
4101 if (IS_UP(slave->dev) &&
4102 (slave->link == BOND_LINK_UP) &&
4103 (slave->state == BOND_STATE_ACTIVE)) {
4104 if (tx_dev) {
4105 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4106 if (!skb2) {
4107 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4108 ": %s: Error: bond_xmit_broadcast(): "
4109 "skb_clone() failed\n",
4110 bond_dev->name);
1da177e4
LT		 4111 continue;
4112 }
4113
4114 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4115 if (res) {
4116 dev_kfree_skb(skb2);
4117 continue;
4118 }
4119 }
4120 tx_dev = slave->dev;
4121 }
4122 }
4123
4124 if (tx_dev) {
4125 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4126 }
4127
4128out:
4129 if (res) {
4130 /* no suitable interface, frame not sent */
4131 dev_kfree_skb(skb);
4132 }
4133 /* frame sent to all suitable interfaces */
4134 read_unlock(&bond->lock);
4135 return 0;
4136}
4137
4138/*------------------------- Device initialization ---------------------------*/
4139
4140/*
4141 * set bond mode specific net device operations
4142 */
a77b5325 4143void bond_set_mode_ops(struct bonding *bond, int mode)
1da177e4 4144{
169a3e66
JV		 4145 struct net_device *bond_dev = bond->dev;
4146
1da177e4
LT		 4147 switch (mode) {
4148 case BOND_MODE_ROUNDROBIN:
4149 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4150 break;
4151 case BOND_MODE_ACTIVEBACKUP:
4152 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4153 break;
4154 case BOND_MODE_XOR:
4155 bond_dev->hard_start_xmit = bond_xmit_xor;
169a3e66
JV		 4156 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4157 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4158 else
4159 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4
LT		 4160 break;
4161 case BOND_MODE_BROADCAST:
4162 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4163 break;
4164 case BOND_MODE_8023AD:
8f903c70 4165 bond_set_master_3ad_flags(bond);
1da177e4 4166 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
169a3e66
JV		 4167 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4168 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4169 else
4170 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4 4171 break;
1da177e4 4172 case BOND_MODE_ALB:
8f903c70
JV		 4173 bond_set_master_alb_flags(bond);
4174 /* FALLTHRU */
4175 case BOND_MODE_TLB:
1da177e4
LT		 4176 bond_dev->hard_start_xmit = bond_alb_xmit;
4177 bond_dev->set_mac_address = bond_alb_set_mac_address;
4178 break;
4179 default:
4180 /* Should never happen, mode already checked */
4181 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4182 ": %s: Error: Unknown bonding mode %d\n",
4183 bond_dev->name,
1da177e4
LT		 4184 mode);
4185 break;
4186 }
4187}
4188
217df670
JV		 4189static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4190 struct ethtool_drvinfo *drvinfo)
4191{
4192 strncpy(drvinfo->driver, DRV_NAME, 32);
4193 strncpy(drvinfo->version, DRV_VERSION, 32);
4194 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4195}
4196
7282d491 4197static const struct ethtool_ops bond_ethtool_ops = {
8531c5ff 4198 .get_tx_csum = ethtool_op_get_tx_csum,
a0de3adf
JV		 4199 .get_tso = ethtool_op_get_tso,
4200 .get_ufo = ethtool_op_get_ufo,
8531c5ff 4201 .get_sg = ethtool_op_get_sg,
217df670 4202 .get_drvinfo = bond_ethtool_get_drvinfo,
8531c5ff
AK		 4203};
4204
1da177e4
LT		 4205/*
4206 * Does not allocate but creates a /proc entry.
4207 * Allowed to fail.
4208 */
3c535952 4209static int bond_init(struct net_device *bond_dev, struct bond_params *params)
1da177e4
LT		 4210{
4211 struct bonding *bond = bond_dev->priv;
4212
4213 dprintk("Begin bond_init for %s\n", bond_dev->name);
4214
4215 /* initialize rwlocks */
4216 rwlock_init(&bond->lock);
4217 rwlock_init(&bond->curr_slave_lock);
4218
4219 bond->params = *params; /* copy params struct */
4220
4221 /* Initialize pointers */
4222 bond->first_slave = NULL;
4223 bond->curr_active_slave = NULL;
4224 bond->current_arp_slave = NULL;
4225 bond->primary_slave = NULL;
4226 bond->dev = bond_dev;
4227 INIT_LIST_HEAD(&bond->vlan_list);
4228
4229 /* Initialize the device entry points */
4230 bond_dev->open = bond_open;
4231 bond_dev->stop = bond_close;
4232 bond_dev->get_stats = bond_get_stats;
4233 bond_dev->do_ioctl = bond_do_ioctl;
8531c5ff 4234 bond_dev->ethtool_ops = &bond_ethtool_ops;
1da177e4
LT		 4235 bond_dev->set_multicast_list = bond_set_multicast_list;
4236 bond_dev->change_mtu = bond_change_mtu;
4237 bond_dev->set_mac_address = bond_set_mac_address;
4238
169a3e66 4239 bond_set_mode_ops(bond, bond->params.mode);
1da177e4
LT		 4240
4241 bond_dev->destructor = free_netdev;
4242
4243 /* Initialize the device options */
4244 bond_dev->tx_queue_len = 0;
4245 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
0b680e75 4246 bond_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 4247
4248 /* At first, we block adding VLANs. That's the only way to
4249 * prevent problems that occur when adding VLANs over an
4250 * empty bond. The block will be removed once non-challenged
4251 * slaves are enslaved.
4252 */
4253 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4254
932ff279 4255 /* don't acquire bond device's netif_tx_lock when
1da177e4
LT		 4256 * transmitting */
4257 bond_dev->features |= NETIF_F_LLTX;
4258
4259 /* By default, we declare the bond to be fully
4260 * VLAN hardware accelerated capable. Special
4261 * care is taken in the various xmit functions
4262 * when there are slaves that are not hw accel
4263 * capable
4264 */
4265 bond_dev->vlan_rx_register = bond_vlan_rx_register;
4266 bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid;
4267 bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4268 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4269 NETIF_F_HW_VLAN_RX |
4270 NETIF_F_HW_VLAN_FILTER);
4271
4272#ifdef CONFIG_PROC_FS
4273 bond_create_proc_entry(bond);
4274#endif
4275
4276 list_add_tail(&bond->bond_list, &bond_dev_list);
4277
4278 return 0;
4279}
4280
4281/* De-initialize device specific data.
4282 * Caller must hold rtnl_lock.
4283 */
a77b5325 4284void bond_deinit(struct net_device *bond_dev)
1da177e4
LT		 4285{
4286 struct bonding *bond = bond_dev->priv;
4287
4288 list_del(&bond->bond_list);
4289
4290#ifdef CONFIG_PROC_FS
4291 bond_remove_proc_entry(bond);
4292#endif
4293}
4294
4295/* Unregister and free all bond devices.
4296 * Caller must hold rtnl_lock.
4297 */
4298static void bond_free_all(void)
4299{
4300 struct bonding *bond, *nxt;
4301
4302 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4303 struct net_device *bond_dev = bond->dev;
4304
70298705 4305 bond_mc_list_destroy(bond);
4306 /* Release the bonded slaves */
4307 bond_release_all(bond_dev);
1da177e4 4308 bond_deinit(bond_dev);
3201e656 4309 unregister_netdevice(bond_dev);
1da177e4
LT		 4310 }
4311
4312#ifdef CONFIG_PROC_FS
4313 bond_destroy_proc_dir();
4314#endif
4315}
4316
4317/*------------------------- Module initialization ---------------------------*/
4318
4319/*
4320 * Convert string input module parms. Accept either the
4321 * number of the mode or its string name.
4322 */
a77b5325 4323int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
1da177e4
LT		 4324{
4325 int i;
4326
4327 for (i = 0; tbl[i].modename; i++) {
4328 if ((isdigit(*mode_arg) &&
4329 tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4330 (strncmp(mode_arg, tbl[i].modename,
4331 strlen(tbl[i].modename)) == 0)) {
4332 return tbl[i].mode;
4333 }
4334 }
4335
4336 return -1;
4337}
4338
4339static int bond_check_params(struct bond_params *params)
4340{
f5b2b966
JV		 4341 int arp_validate_value;
4342
1da177e4
LT		 4343 /*
4344 * Convert string parameters.
4345 */
4346 if (mode) {
4347 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4348 if (bond_mode == -1) {
4349 printk(KERN_ERR DRV_NAME
4350 ": Error: Invalid bonding mode \"%s\"\n",
4351 mode == NULL ? "NULL" : mode);
4352 return -EINVAL;
4353 }
4354 }
4355
169a3e66
JV		 4356 if (xmit_hash_policy) {
4357 if ((bond_mode != BOND_MODE_XOR) &&
4358 (bond_mode != BOND_MODE_8023AD)) {
4359 printk(KERN_INFO DRV_NAME
4360 ": xor_mode param is irrelevant in mode %s\n",
4361 bond_mode_name(bond_mode));
4362 } else {
4363 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4364 xmit_hashtype_tbl);
4365 if (xmit_hashtype == -1) {
4366 printk(KERN_ERR DRV_NAME
4367 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4368 xmit_hash_policy == NULL ? "NULL" :
4369 xmit_hash_policy);
4370 return -EINVAL;
4371 }
4372 }
4373 }
4374
1da177e4
LT		 4375 if (lacp_rate) {
4376 if (bond_mode != BOND_MODE_8023AD) {
4377 printk(KERN_INFO DRV_NAME
4378 ": lacp_rate param is irrelevant in mode %s\n",
4379 bond_mode_name(bond_mode));
4380 } else {
4381 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4382 if (lacp_fast == -1) {
4383 printk(KERN_ERR DRV_NAME
4384 ": Error: Invalid lacp rate \"%s\"\n",
4385 lacp_rate == NULL ? "NULL" : lacp_rate);
4386 return -EINVAL;
4387 }
4388 }
4389 }
4390
4391 if (max_bonds < 1 || max_bonds > INT_MAX) {
4392 printk(KERN_WARNING DRV_NAME
4393 ": Warning: max_bonds (%d) not in range %d-%d, so it "
4e0952c7 4394 "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
1da177e4
LT		 4395 max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4396 max_bonds = BOND_DEFAULT_MAX_BONDS;
4397 }
4398
4399 if (miimon < 0) {
4400 printk(KERN_WARNING DRV_NAME
4401 ": Warning: miimon module parameter (%d), "
4402 "not in range 0-%d, so it was reset to %d\n",
4403 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4404 miimon = BOND_LINK_MON_INTERV;
4405 }
4406
4407 if (updelay < 0) {
4408 printk(KERN_WARNING DRV_NAME
4409 ": Warning: updelay module parameter (%d), "
4410 "not in range 0-%d, so it was reset to 0\n",
4411 updelay, INT_MAX);
4412 updelay = 0;
4413 }
4414
4415 if (downdelay < 0) {
4416 printk(KERN_WARNING DRV_NAME
4417 ": Warning: downdelay module parameter (%d), "
4418 "not in range 0-%d, so it was reset to 0\n",
4419 downdelay, INT_MAX);
4420 downdelay = 0;
4421 }
4422
4423 if ((use_carrier != 0) && (use_carrier != 1)) {
4424 printk(KERN_WARNING DRV_NAME
4425 ": Warning: use_carrier module parameter (%d), "
4426 "not of valid value (0/1), so it was set to 1\n",
4427 use_carrier);
4428 use_carrier = 1;
4429 }
4430
4431 /* reset values for 802.3ad */
4432 if (bond_mode == BOND_MODE_8023AD) {
4433 if (!miimon) {
4434 printk(KERN_WARNING DRV_NAME
4435 ": Warning: miimon must be specified, "
4436 "otherwise bonding will not detect link "
4437 "failure, speed and duplex which are "
4438 "essential for 802.3ad operation\n");
4439 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4440 miimon = 100;
4441 }
4442 }
4443
4444 /* reset values for TLB/ALB */
4445 if ((bond_mode == BOND_MODE_TLB) ||
4446 (bond_mode == BOND_MODE_ALB)) {
4447 if (!miimon) {
4448 printk(KERN_WARNING DRV_NAME
4449 ": Warning: miimon must be specified, "
4450 "otherwise bonding will not detect link "
4451 "failure and link speed which are essential "
4452 "for TLB/ALB load balancing\n");
4453 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4454 miimon = 100;
4455 }
4456 }
4457
4458 if (bond_mode == BOND_MODE_ALB) {
4459 printk(KERN_NOTICE DRV_NAME
4460 ": In ALB mode you might experience client "
4461 "disconnections upon reconnection of a link if the "
4462 "bonding module updelay parameter (%d msec) is "
4463 "incompatible with the forwarding delay time of the "
4464 "switch\n",
4465 updelay);
4466 }
4467
4468 if (!miimon) {
4469 if (updelay || downdelay) {
4470 /* just warn the user the up/down delay will have
4471 * no effect since miimon is zero...
4472 */
4473 printk(KERN_WARNING DRV_NAME
4474 ": Warning: miimon module parameter not set "
4475 "and updelay (%d) or downdelay (%d) module "
4476 "parameter is set; updelay and downdelay have "
4477 "no effect unless miimon is set\n",
4478 updelay, downdelay);
4479 }
4480 } else {
4481 /* don't allow arp monitoring */
4482 if (arp_interval) {
4483 printk(KERN_WARNING DRV_NAME
4484 ": Warning: miimon (%d) and arp_interval (%d) "
4485 "can't be used simultaneously, disabling ARP "
4486 "monitoring\n",
4487 miimon, arp_interval);
4488 arp_interval = 0;
4489 }
4490
4491 if ((updelay % miimon) != 0) {
4492 printk(KERN_WARNING DRV_NAME
4493 ": Warning: updelay (%d) is not a multiple "
4494 "of miimon (%d), updelay rounded to %d ms\n",
4495 updelay, miimon, (updelay / miimon) * miimon);
4496 }
4497
4498 updelay /= miimon;
4499
4500 if ((downdelay % miimon) != 0) {
4501 printk(KERN_WARNING DRV_NAME
4502 ": Warning: downdelay (%d) is not a multiple "
4503 "of miimon (%d), downdelay rounded to %d ms\n",
4504 downdelay, miimon,
4505 (downdelay / miimon) * miimon);
4506 }
4507
4508 downdelay /= miimon;
4509 }
4510
4511 if (arp_interval < 0) {
4512 printk(KERN_WARNING DRV_NAME
4513 ": Warning: arp_interval module parameter (%d) "
4514 ", not in range 0-%d, so it was reset to %d\n",
4515 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4516 arp_interval = BOND_LINK_ARP_INTERV;
4517 }
4518
4519 for (arp_ip_count = 0;
4520 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4521 arp_ip_count++) {
4522 /* not complete check, but should be good enough to
4523 catch mistakes */
4524 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4525 printk(KERN_WARNING DRV_NAME
4526 ": Warning: bad arp_ip_target module parameter "
4527 "(%s), ARP monitoring will not be performed\n",
4528 arp_ip_target[arp_ip_count]);
4529 arp_interval = 0;
4530 } else {
4531 u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4532 arp_target[arp_ip_count] = ip;
4533 }
4534 }
4535
4536 if (arp_interval && !arp_ip_count) {
4537 /* don't allow arping if no arp_ip_target given... */
4538 printk(KERN_WARNING DRV_NAME
4539 ": Warning: arp_interval module parameter (%d) "
4540 "specified without providing an arp_ip_target "
4541 "parameter, arp_interval was reset to 0\n",
4542 arp_interval);
4543 arp_interval = 0;
4544 }
4545
f5b2b966
JV		 4546 if (arp_validate) {
4547 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4548 printk(KERN_ERR DRV_NAME
4549 ": arp_validate only supported in active-backup mode\n");
4550 return -EINVAL;
4551 }
4552 if (!arp_interval) {
4553 printk(KERN_ERR DRV_NAME
4554 ": arp_validate requires arp_interval\n");
4555 return -EINVAL;
4556 }
4557
4558 arp_validate_value = bond_parse_parm(arp_validate,
4559 arp_validate_tbl);
4560 if (arp_validate_value == -1) {
4561 printk(KERN_ERR DRV_NAME
4562 ": Error: invalid arp_validate \"%s\"\n",
4563 arp_validate == NULL ? "NULL" : arp_validate);
4564 return -EINVAL;
4565 }
4566 } else
4567 arp_validate_value = 0;
4568
1da177e4
LT		 4569 if (miimon) {
4570 printk(KERN_INFO DRV_NAME
4571 ": MII link monitoring set to %d ms\n",
4572 miimon);
4573 } else if (arp_interval) {
4574 int i;
4575
4576 printk(KERN_INFO DRV_NAME
f5b2b966
JV		 4577 ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4578 arp_interval,
4579 arp_validate_tbl[arp_validate_value].modename,
4580 arp_ip_count);
1da177e4
LT		 4581
4582 for (i = 0; i < arp_ip_count; i++)
4583 printk (" %s", arp_ip_target[i]);
4584
4585 printk("\n");
4586
4587 } else {
4588 /* miimon and arp_interval not set, we need one so things
4589 * work as expected, see bonding.txt for details
4590 */
4591 printk(KERN_WARNING DRV_NAME
4592 ": Warning: either miimon or arp_interval and "
4593 "arp_ip_target module parameters must be specified, "
4594 "otherwise bonding will not detect link failures! see "
4595 "bonding.txt for details.\n");
4596 }
4597
4598 if (primary && !USES_PRIMARY(bond_mode)) {
4599 /* currently, using a primary only makes sense
4600 * in active backup, TLB or ALB modes
4601 */
4602 printk(KERN_WARNING DRV_NAME
4603 ": Warning: %s primary device specified but has no "
4604 "effect in %s mode\n",
4605 primary, bond_mode_name(bond_mode));
4606 primary = NULL;
4607 }
4608
4609 /* fill params struct with the proper values */
4610 params->mode = bond_mode;
169a3e66 4611 params->xmit_policy = xmit_hashtype;
1da177e4
LT		 4612 params->miimon = miimon;
4613 params->arp_interval = arp_interval;
f5b2b966 4614 params->arp_validate = arp_validate_value;
1da177e4
LT		 4615 params->updelay = updelay;
4616 params->downdelay = downdelay;
4617 params->use_carrier = use_carrier;
4618 params->lacp_fast = lacp_fast;
4619 params->primary[0] = 0;
4620
4621 if (primary) {
4622 strncpy(params->primary, primary, IFNAMSIZ);
4623 params->primary[IFNAMSIZ - 1] = 0;
4624 }
4625
4626 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4627
4628 return 0;
4629}
4630
0daa2303
PZ		 4631static struct lock_class_key bonding_netdev_xmit_lock_key;
4632
dfe60397 4633/* Create a new bond based on the specified name and bonding parameters.
e4b91c48 4634 * If name is NULL, obtain a suitable "bond%d" name for us.
dfe60397
MW		 4635 * Caller must NOT hold rtnl_lock; we need to release it here before we
4636 * set up our sysfs entries.
4637 */
4638int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4639{
4640 struct net_device *bond_dev;
4641 int res;
4642
4643 rtnl_lock();
e4b91c48
JV		 4644 bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4645 ether_setup);
dfe60397
MW		 4646 if (!bond_dev) {
4647 printk(KERN_ERR DRV_NAME
4648 ": %s: eek! can't alloc netdev!\n",
4649 name);
4650 res = -ENOMEM;
4651 goto out_rtnl;
4652 }
4653
e4b91c48
JV		 4654 if (!name) {
4655 res = dev_alloc_name(bond_dev, "bond%d");
4656 if (res < 0)
4657 goto out_netdev;
4658 }
4659
dfe60397
MW		 4660 /* bond_init() must be called after dev_alloc_name() (for the
4661 * /proc files), but before register_netdevice(), because we
4662 * need to set function pointers.
4663 */
4664
4665 res = bond_init(bond_dev, params);
4666 if (res < 0) {
4667 goto out_netdev;
4668 }
4669
4670 SET_MODULE_OWNER(bond_dev);
4671
4672 res = register_netdevice(bond_dev);
4673 if (res < 0) {
4674 goto out_bond;
4675 }
0daa2303
PZ		 4676
4677 lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4678
dfe60397
MW		 4679 if (newbond)
4680 *newbond = bond_dev->priv;
4681
ff59c456
JV		 4682 netif_carrier_off(bond_dev);
4683
dfe60397 4684 rtnl_unlock(); /* allows sysfs registration of net device */
b76cdba9 4685 res = bond_create_sysfs_entry(bond_dev->priv);
09c89279
JV		 4686 if (res < 0) {
4687 rtnl_lock();
4688 goto out_bond;
4689 }
4690
4691 return 0;
4692
dfe60397
MW		 4693out_bond:
4694 bond_deinit(bond_dev);
4695out_netdev:
4696 free_netdev(bond_dev);
4697out_rtnl:
4698 rtnl_unlock();
dfe60397
MW		 4699 return res;
4700}
4701
1da177e4
LT		 4702static int __init bonding_init(void)
4703{
1da177e4
LT		 4704 int i;
4705 int res;
4706
4707 printk(KERN_INFO "%s", version);
4708
dfe60397 4709 res = bond_check_params(&bonding_defaults);
1da177e4 4710 if (res) {
dfe60397 4711 goto out;
1da177e4
LT		 4712 }
4713
1da177e4
LT		 4714#ifdef CONFIG_PROC_FS
4715 bond_create_proc_dir();
4716#endif
1da177e4 4717 for (i = 0; i < max_bonds; i++) {
e4b91c48 4718 res = bond_create(NULL, &bonding_defaults, NULL);
dfe60397
MW		 4719 if (res)
4720 goto err;
1da177e4
LT		 4721 }
4722
b76cdba9
MW		 4723 res = bond_create_sysfs();
4724 if (res)
4725 goto err;
4726
1da177e4 4727 register_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4728 register_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4 4729
dfe60397
MW		 4730 goto out;
4731err:
40abc270 4732 rtnl_lock();
1da177e4 4733 bond_free_all();
b76cdba9 4734 bond_destroy_sysfs();
1da177e4 4735 rtnl_unlock();
dfe60397 4736out:
1da177e4 4737 return res;
dfe60397 4738
1da177e4
LT		 4739}
4740
4741static void __exit bonding_exit(void)
4742{
4743 unregister_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4744 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4
LT		 4745
4746 rtnl_lock();
4747 bond_free_all();
b76cdba9 4748 bond_destroy_sysfs();
1da177e4
LT		 4749 rtnl_unlock();
4750}
4751
4752module_init(bonding_init);
4753module_exit(bonding_exit);
4754MODULE_LICENSE("GPL");
4755MODULE_VERSION(DRV_VERSION);
4756MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4757MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4758MODULE_SUPPORTED_DEVICE("most ethernet devices");
4759
4760/*
4761 * Local variables:
4762 * c-indent-level: 8
4763 * c-basic-offset: 8
4764 * tab-width: 8
4765 * End:
4766 */
4767
Clone of davem's net-next-2.6 tree