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[ATM] drivers/atm/iphase.c: mostly kmalloc + memset conversion to kzalloc
[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
8531c5ff 1205#define BOND_INTERSECT_FEATURES \
8648b305 1206 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_TSO | NETIF_F_UFO)
8531c5ff
AK		 1207
1208/*
8e3babcd
JV		 1209 * Compute the common dev->feature set available to all slaves. Some
1210 * feature bits are managed elsewhere, so preserve feature bits set on
1211 * master device that are not part of the examined set.
8531c5ff
AK		 1212 */
1213static int bond_compute_features(struct bonding *bond)
1214{
8e3babcd 1215 unsigned long features = BOND_INTERSECT_FEATURES;
8531c5ff
AK		 1216 struct slave *slave;
1217 struct net_device *bond_dev = bond->dev;
54ef3137 1218 unsigned short max_hard_header_len = ETH_HLEN;
8e3babcd 1219 int i;
8531c5ff 1220
54ef3137 1221 bond_for_each_slave(bond, slave, i) {
8e3babcd 1222 features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
54ef3137
JV		 1223 if (slave->dev->hard_header_len > max_hard_header_len)
1224 max_hard_header_len = slave->dev->hard_header_len;
1225 }
8531c5ff 1226
8531c5ff 1227 if ((features & NETIF_F_SG) &&
8648b305 1228 !(features & NETIF_F_ALL_CSUM))
8531c5ff 1229 features &= ~NETIF_F_SG;
8531c5ff 1230
a0de3adf
JV		 1231 /*
1232 * features will include NETIF_F_TSO (NETIF_F_UFO) iff all
1233 * slave devices support NETIF_F_TSO (NETIF_F_UFO), which
1234 * implies that all slaves also support scatter-gather
1235 * (NETIF_F_SG), which implies that features also includes
1236 * NETIF_F_SG. So no need to check whether we have an
1237 * illegal combination of NETIF_F_{TSO,UFO} and
1238 * !NETIF_F_SG
1239 */
1240
8e3babcd 1241 features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
8531c5ff 1242 bond_dev->features = features;
54ef3137 1243 bond_dev->hard_header_len = max_hard_header_len;
8531c5ff
AK		 1244
1245 return 0;
1246}
1247
1da177e4 1248/* enslave device <slave> to bond device <master> */
a77b5325 1249int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1250{
1251 struct bonding *bond = bond_dev->priv;
1252 struct slave *new_slave = NULL;
1253 struct dev_mc_list *dmi;
1254 struct sockaddr addr;
1255 int link_reporting;
1256 int old_features = bond_dev->features;
1257 int res = 0;
1258
552709d5 1259 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1260 slave_dev->do_ioctl == NULL) {
1da177e4 1261 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1262 ": %s: Warning: no link monitoring support for %s\n",
1263 bond_dev->name, slave_dev->name);
1da177e4
LT		 1264 }
1265
1266 /* bond must be initialized by bond_open() before enslaving */
1267 if (!(bond_dev->flags & IFF_UP)) {
1268 dprintk("Error, master_dev is not up\n");
1269 return -EPERM;
1270 }
1271
1272 /* already enslaved */
1273 if (slave_dev->flags & IFF_SLAVE) {
1274 dprintk("Error, Device was already enslaved\n");
1275 return -EBUSY;
1276 }
1277
1278 /* vlan challenged mutual exclusion */
1279 /* no need to lock since we're protected by rtnl_lock */
1280 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1281 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1282 if (!list_empty(&bond->vlan_list)) {
1283 printk(KERN_ERR DRV_NAME
4e0952c7 1284 ": %s: Error: cannot enslave VLAN "
1da177e4 1285 "challenged slave %s on VLAN enabled "
4e0952c7 1286 "bond %s\n", bond_dev->name, slave_dev->name,
1da177e4
LT		 1287 bond_dev->name);
1288 return -EPERM;
1289 } else {
1290 printk(KERN_WARNING DRV_NAME
4e0952c7 1291 ": %s: Warning: enslaved VLAN challenged "
1da177e4
LT		 1292 "slave %s. Adding VLANs will be blocked as "
1293 "long as %s is part of bond %s\n",
4e0952c7 1294 bond_dev->name, slave_dev->name, slave_dev->name,
1da177e4
LT		 1295 bond_dev->name);
1296 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1297 }
1298 } else {
1299 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1300 if (bond->slave_cnt == 0) {
1301 /* First slave, and it is not VLAN challenged,
1302 * so remove the block of adding VLANs over the bond.
1303 */
1304 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1305 }
1306 }
1307
217df670
JV		 1308 /*
1309 * Old ifenslave binaries are no longer supported. These can
1310 * be identified with moderate accurary by the state of the slave:
1311 * the current ifenslave will set the interface down prior to
1312 * enslaving it; the old ifenslave will not.
1313 */
1314 if ((slave_dev->flags & IFF_UP)) {
1315 printk(KERN_ERR DRV_NAME ": %s is up. "
1316 "This may be due to an out of date ifenslave.\n",
1317 slave_dev->name);
1318 res = -EPERM;
1319 goto err_undo_flags;
1320 }
1da177e4 1321
217df670
JV		 1322 if (slave_dev->set_mac_address == NULL) {
1323 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 1324 ": %s: Error: The slave device you specified does "
1325 "not support setting the MAC address. "
1326 "Your kernel likely does not support slave "
1327 "devices.\n", bond_dev->name);
1328 res = -EOPNOTSUPP;
217df670 1329 goto err_undo_flags;
1da177e4
LT		 1330 }
1331
243cb4e5 1332 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1da177e4
LT		 1333 if (!new_slave) {
1334 res = -ENOMEM;
1335 goto err_undo_flags;
1336 }
1337
1da177e4
LT		 1338 /* save slave's original flags before calling
1339 * netdev_set_master and dev_open
1340 */
1341 new_slave->original_flags = slave_dev->flags;
1342
217df670
JV		 1343 /*
1344 * Save slave's original ("permanent") mac address for modes
1345 * that need it, and for restoring it upon release, and then
1346 * set it to the master's address
1347 */
1348 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1da177e4 1349
217df670
JV		 1350 /*
1351 * Set slave to master's mac address. The application already
1352 * set the master's mac address to that of the first slave
1353 */
1354 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1355 addr.sa_family = slave_dev->type;
1356 res = dev_set_mac_address(slave_dev, &addr);
1357 if (res) {
1358 dprintk("Error %d calling set_mac_address\n", res);
1359 goto err_free;
1360 }
1da177e4 1361
c2edacf8
JV		 1362 res = netdev_set_master(slave_dev, bond_dev);
1363 if (res) {
1364 dprintk("Error %d calling netdev_set_master\n", res);
1365 goto err_close;
1366 }
217df670
JV		 1367 /* open the slave since the application closed it */
1368 res = dev_open(slave_dev);
1369 if (res) {
1370 dprintk("Openning slave %s failed\n", slave_dev->name);
1371 goto err_restore_mac;
1da177e4
LT		 1372 }
1373
1da177e4 1374 new_slave->dev = slave_dev;
0b680e75 1375 slave_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 1376
1377 if ((bond->params.mode == BOND_MODE_TLB) ||
1378 (bond->params.mode == BOND_MODE_ALB)) {
1379 /* bond_alb_init_slave() must be called before all other stages since
1380 * it might fail and we do not want to have to undo everything
1381 */
1382 res = bond_alb_init_slave(bond, new_slave);
1383 if (res) {
1384 goto err_unset_master;
1385 }
1386 }
1387
1388 /* If the mode USES_PRIMARY, then the new slave gets the
1389 * master's promisc (and mc) settings only if it becomes the
1390 * curr_active_slave, and that is taken care of later when calling
1391 * bond_change_active()
1392 */
1393 if (!USES_PRIMARY(bond->params.mode)) {
1394 /* set promiscuity level to new slave */
1395 if (bond_dev->flags & IFF_PROMISC) {
1396 dev_set_promiscuity(slave_dev, 1);
1397 }
1398
1399 /* set allmulti level to new slave */
1400 if (bond_dev->flags & IFF_ALLMULTI) {
1401 dev_set_allmulti(slave_dev, 1);
1402 }
1403
1404 /* upload master's mc_list to new slave */
1405 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1406 dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1407 }
1408 }
1409
1410 if (bond->params.mode == BOND_MODE_8023AD) {
1411 /* add lacpdu mc addr to mc list */
1412 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1413
1414 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1415 }
1416
1417 bond_add_vlans_on_slave(bond, slave_dev);
1418
1419 write_lock_bh(&bond->lock);
1420
1421 bond_attach_slave(bond, new_slave);
1422
1423 new_slave->delay = 0;
1424 new_slave->link_failure_count = 0;
1425
8531c5ff
AK		 1426 bond_compute_features(bond);
1427
f5b2b966
JV		 1428 new_slave->last_arp_rx = jiffies;
1429
1da177e4
LT		 1430 if (bond->params.miimon && !bond->params.use_carrier) {
1431 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1432
1433 if ((link_reporting == -1) && !bond->params.arp_interval) {
1434 /*
1435 * miimon is set but a bonded network driver
1436 * does not support ETHTOOL/MII and
1437 * arp_interval is not set. Note: if
1438 * use_carrier is enabled, we will never go
1439 * here (because netif_carrier is always
1440 * supported); thus, we don't need to change
1441 * the messages for netif_carrier.
1442 */
1443 printk(KERN_WARNING DRV_NAME
4e0952c7 1444 ": %s: Warning: MII and ETHTOOL support not "
1da177e4
LT		 1445 "available for interface %s, and "
1446 "arp_interval/arp_ip_target module parameters "
1447 "not specified, thus bonding will not detect "
1448 "link failures! see bonding.txt for details.\n",
4e0952c7 1449 bond_dev->name, slave_dev->name);
1da177e4
LT		 1450 } else if (link_reporting == -1) {
1451 /* unable get link status using mii/ethtool */
1452 printk(KERN_WARNING DRV_NAME
4e0952c7 1453 ": %s: Warning: can't get link status from "
1da177e4
LT		 1454 "interface %s; the network driver associated "
1455 "with this interface does not support MII or "
1456 "ETHTOOL link status reporting, thus miimon "
1457 "has no effect on this interface.\n",
4e0952c7 1458 bond_dev->name, slave_dev->name);
1da177e4
LT		 1459 }
1460 }
1461
1462 /* check for initial state */
1463 if (!bond->params.miimon ||
1464 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1465 if (bond->params.updelay) {
1466 dprintk("Initial state of slave_dev is "
1467 "BOND_LINK_BACK\n");
1468 new_slave->link = BOND_LINK_BACK;
1469 new_slave->delay = bond->params.updelay;
1470 } else {
1471 dprintk("Initial state of slave_dev is "
1472 "BOND_LINK_UP\n");
1473 new_slave->link = BOND_LINK_UP;
1474 }
1475 new_slave->jiffies = jiffies;
1476 } else {
1477 dprintk("Initial state of slave_dev is "
1478 "BOND_LINK_DOWN\n");
1479 new_slave->link = BOND_LINK_DOWN;
1480 }
1481
1482 if (bond_update_speed_duplex(new_slave) &&
1483 (new_slave->link != BOND_LINK_DOWN)) {
1484 printk(KERN_WARNING DRV_NAME
4e0952c7 1485 ": %s: Warning: failed to get speed and duplex from %s, "
1da177e4 1486 "assumed to be 100Mb/sec and Full.\n",
4e0952c7 1487 bond_dev->name, new_slave->dev->name);
1da177e4
LT		 1488
1489 if (bond->params.mode == BOND_MODE_8023AD) {
4e0952c7
MW		 1490 printk(KERN_WARNING DRV_NAME
1491 ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1da177e4 1492 "support in base driver for proper aggregator "
4e0952c7 1493 "selection.\n", bond_dev->name);
1da177e4
LT		 1494 }
1495 }
1496
1497 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1498 /* if there is a primary slave, remember it */
1499 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1500 bond->primary_slave = new_slave;
1501 }
1502 }
1503
1504 switch (bond->params.mode) {
1505 case BOND_MODE_ACTIVEBACKUP:
8a8e447b
JV		 1506 bond_set_slave_inactive_flags(new_slave);
1507 bond_select_active_slave(bond);
1da177e4
LT		 1508 break;
1509 case BOND_MODE_8023AD:
1510 /* in 802.3ad mode, the internal mechanism
1511 * will activate the slaves in the selected
1512 * aggregator
1513 */
1514 bond_set_slave_inactive_flags(new_slave);
1515 /* if this is the first slave */
1516 if (bond->slave_cnt == 1) {
1517 SLAVE_AD_INFO(new_slave).id = 1;
1518 /* Initialize AD with the number of times that the AD timer is called in 1 second
1519 * can be called only after the mac address of the bond is set
1520 */
1521 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1522 bond->params.lacp_fast);
1523 } else {
1524 SLAVE_AD_INFO(new_slave).id =
1525 SLAVE_AD_INFO(new_slave->prev).id + 1;
1526 }
1527
1528 bond_3ad_bind_slave(new_slave);
1529 break;
1530 case BOND_MODE_TLB:
1531 case BOND_MODE_ALB:
1532 new_slave->state = BOND_STATE_ACTIVE;
1533 if ((!bond->curr_active_slave) &&
1534 (new_slave->link != BOND_LINK_DOWN)) {
1535 /* first slave or no active slave yet, and this link
1536 * is OK, so make this interface the active one
1537 */
1538 bond_change_active_slave(bond, new_slave);
8f903c70
JV		 1539 } else {
1540 bond_set_slave_inactive_flags(new_slave);
1da177e4
LT		 1541 }
1542 break;
1543 default:
1544 dprintk("This slave is always active in trunk mode\n");
1545
1546 /* always active in trunk mode */
1547 new_slave->state = BOND_STATE_ACTIVE;
1548
1549 /* In trunking mode there is little meaning to curr_active_slave
1550 * anyway (it holds no special properties of the bond device),
1551 * so we can change it without calling change_active_interface()
1552 */
1553 if (!bond->curr_active_slave) {
1554 bond->curr_active_slave = new_slave;
1555 }
1556 break;
1557 } /* switch(bond_mode) */
1558
ff59c456
JV		 1559 bond_set_carrier(bond);
1560
1da177e4
LT		 1561 write_unlock_bh(&bond->lock);
1562
b76cdba9
MW		 1563 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1564 if (res)
1565 goto err_unset_master;
1566
1da177e4
LT		 1567 printk(KERN_INFO DRV_NAME
1568 ": %s: enslaving %s as a%s interface with a%s link.\n",
1569 bond_dev->name, slave_dev->name,
1570 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1571 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1572
1573 /* enslave is successful */
1574 return 0;
1575
1576/* Undo stages on error */
1577err_unset_master:
1578 netdev_set_master(slave_dev, NULL);
1579
1580err_close:
1581 dev_close(slave_dev);
1582
1583err_restore_mac:
1584 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1585 addr.sa_family = slave_dev->type;
1586 dev_set_mac_address(slave_dev, &addr);
1587
1588err_free:
1589 kfree(new_slave);
1590
1591err_undo_flags:
1592 bond_dev->features = old_features;
8531c5ff 1593
1da177e4
LT		 1594 return res;
1595}
1596
1597/*
1598 * Try to release the slave device <slave> from the bond device <master>
1599 * It is legal to access curr_active_slave without a lock because all the function
1600 * is write-locked.
1601 *
1602 * The rules for slave state should be:
1603 * for Active/Backup:
1604 * Active stays on all backups go down
1605 * for Bonded connections:
1606 * The first up interface should be left on and all others downed.
1607 */
a77b5325 1608int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1609{
1610 struct bonding *bond = bond_dev->priv;
1611 struct slave *slave, *oldcurrent;
1612 struct sockaddr addr;
1613 int mac_addr_differ;
1614
1615 /* slave is not a slave or master is not master of this slave */
1616 if (!(slave_dev->flags & IFF_SLAVE) ||
1617 (slave_dev->master != bond_dev)) {
1618 printk(KERN_ERR DRV_NAME
4e0952c7 1619 ": %s: Error: cannot release %s.\n",
1da177e4
LT		 1620 bond_dev->name, slave_dev->name);
1621 return -EINVAL;
1622 }
1623
1624 write_lock_bh(&bond->lock);
1625
1626 slave = bond_get_slave_by_dev(bond, slave_dev);
1627 if (!slave) {
1628 /* not a slave of this bond */
1629 printk(KERN_INFO DRV_NAME
1630 ": %s: %s not enslaved\n",
1631 bond_dev->name, slave_dev->name);
f5e2a7b2 1632 write_unlock_bh(&bond->lock);
1da177e4
LT		 1633 return -EINVAL;
1634 }
1635
1636 mac_addr_differ = memcmp(bond_dev->dev_addr,
1637 slave->perm_hwaddr,
1638 ETH_ALEN);
1639 if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1640 printk(KERN_WARNING DRV_NAME
4e0952c7 1641 ": %s: Warning: the permanent HWaddr of %s "
1da177e4
LT		 1642 "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1643 "still in use by %s. Set the HWaddr of "
1644 "%s to a different address to avoid "
1645 "conflicts.\n",
4e0952c7 1646 bond_dev->name,
1da177e4
LT		 1647 slave_dev->name,
1648 slave->perm_hwaddr[0],
1649 slave->perm_hwaddr[1],
1650 slave->perm_hwaddr[2],
1651 slave->perm_hwaddr[3],
1652 slave->perm_hwaddr[4],
1653 slave->perm_hwaddr[5],
1654 bond_dev->name,
1655 slave_dev->name);
1656 }
1657
1658 /* Inform AD package of unbinding of slave. */
1659 if (bond->params.mode == BOND_MODE_8023AD) {
1660 /* must be called before the slave is
1661 * detached from the list
1662 */
1663 bond_3ad_unbind_slave(slave);
1664 }
1665
1666 printk(KERN_INFO DRV_NAME
1667 ": %s: releasing %s interface %s\n",
1668 bond_dev->name,
1669 (slave->state == BOND_STATE_ACTIVE)
1670 ? "active" : "backup",
1671 slave_dev->name);
1672
1673 oldcurrent = bond->curr_active_slave;
1674
1675 bond->current_arp_slave = NULL;
1676
1677 /* release the slave from its bond */
1678 bond_detach_slave(bond, slave);
1679
8531c5ff
AK		 1680 bond_compute_features(bond);
1681
1da177e4
LT		 1682 if (bond->primary_slave == slave) {
1683 bond->primary_slave = NULL;
1684 }
1685
1686 if (oldcurrent == slave) {
1687 bond_change_active_slave(bond, NULL);
1688 }
1689
1690 if ((bond->params.mode == BOND_MODE_TLB) ||
1691 (bond->params.mode == BOND_MODE_ALB)) {
1692 /* Must be called only after the slave has been
1693 * detached from the list and the curr_active_slave
1694 * has been cleared (if our_slave == old_current),
1695 * but before a new active slave is selected.
1696 */
1697 bond_alb_deinit_slave(bond, slave);
1698 }
1699
ff59c456 1700 if (oldcurrent == slave)
1da177e4
LT		 1701 bond_select_active_slave(bond);
1702
1da177e4 1703 if (bond->slave_cnt == 0) {
ff59c456
JV		 1704 bond_set_carrier(bond);
1705
1da177e4
LT		 1706 /* if the last slave was removed, zero the mac address
1707 * of the master so it will be set by the application
1708 * to the mac address of the first slave
1709 */
1710 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1711
1712 if (list_empty(&bond->vlan_list)) {
1713 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1714 } else {
1715 printk(KERN_WARNING DRV_NAME
4e0952c7 1716 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1717 "still has VLANs.\n",
4e0952c7 1718 bond_dev->name, bond_dev->name);
1da177e4 1719 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1720 ": %s: When re-adding slaves, make sure the bond's "
1721 "HW address matches its VLANs'.\n",
1722 bond_dev->name);
1da177e4
LT		 1723 }
1724 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1725 !bond_has_challenged_slaves(bond)) {
1726 printk(KERN_INFO DRV_NAME
4e0952c7 1727 ": %s: last VLAN challenged slave %s "
1da177e4 1728 "left bond %s. VLAN blocking is removed\n",
4e0952c7 1729 bond_dev->name, slave_dev->name, bond_dev->name);
1da177e4
LT		 1730 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1731 }
1732
1733 write_unlock_bh(&bond->lock);
1734
b76cdba9
MW		 1735 /* must do this from outside any spinlocks */
1736 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1737
1da177e4
LT		 1738 bond_del_vlans_from_slave(bond, slave_dev);
1739
1740 /* If the mode USES_PRIMARY, then we should only remove its
1741 * promisc and mc settings if it was the curr_active_slave, but that was
1742 * already taken care of above when we detached the slave
1743 */
1744 if (!USES_PRIMARY(bond->params.mode)) {
1745 /* unset promiscuity level from slave */
1746 if (bond_dev->flags & IFF_PROMISC) {
1747 dev_set_promiscuity(slave_dev, -1);
1748 }
1749
1750 /* unset allmulti level from slave */
1751 if (bond_dev->flags & IFF_ALLMULTI) {
1752 dev_set_allmulti(slave_dev, -1);
1753 }
1754
1755 /* flush master's mc_list from slave */
1756 bond_mc_list_flush(bond_dev, slave_dev);
1757 }
1758
1759 netdev_set_master(slave_dev, NULL);
1760
1761 /* close slave before restoring its mac address */
1762 dev_close(slave_dev);
1763
217df670
JV		 1764 /* restore original ("permanent") mac address */
1765 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1766 addr.sa_family = slave_dev->type;
1767 dev_set_mac_address(slave_dev, &addr);
1da177e4 1768
8f903c70 1769 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
f5b2b966
JV		 1770 IFF_SLAVE_INACTIVE | IFF_BONDING |
1771 IFF_SLAVE_NEEDARP);
1da177e4
LT		 1772
1773 kfree(slave);
1774
1775 return 0; /* deletion OK */
1776}
1777
1778/*
1779 * This function releases all slaves.
1780 */
1781static int bond_release_all(struct net_device *bond_dev)
1782{
1783 struct bonding *bond = bond_dev->priv;
1784 struct slave *slave;
1785 struct net_device *slave_dev;
1786 struct sockaddr addr;
1787
1788 write_lock_bh(&bond->lock);
1789
ff59c456
JV		 1790 netif_carrier_off(bond_dev);
1791
1da177e4
LT		 1792 if (bond->slave_cnt == 0) {
1793 goto out;
1794 }
1795
1796 bond->current_arp_slave = NULL;
1797 bond->primary_slave = NULL;
1798 bond_change_active_slave(bond, NULL);
1799
1800 while ((slave = bond->first_slave) != NULL) {
1801 /* Inform AD package of unbinding of slave
1802 * before slave is detached from the list.
1803 */
1804 if (bond->params.mode == BOND_MODE_8023AD) {
1805 bond_3ad_unbind_slave(slave);
1806 }
1807
1808 slave_dev = slave->dev;
1809 bond_detach_slave(bond, slave);
1810
1811 if ((bond->params.mode == BOND_MODE_TLB) ||
1812 (bond->params.mode == BOND_MODE_ALB)) {
1813 /* must be called only after the slave
1814 * has been detached from the list
1815 */
1816 bond_alb_deinit_slave(bond, slave);
1817 }
1818
8531c5ff
AK		 1819 bond_compute_features(bond);
1820
1da177e4
LT		 1821 /* now that the slave is detached, unlock and perform
1822 * all the undo steps that should not be called from
1823 * within a lock.
1824 */
1825 write_unlock_bh(&bond->lock);
1826
b76cdba9 1827 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1da177e4
LT		 1828 bond_del_vlans_from_slave(bond, slave_dev);
1829
1830 /* If the mode USES_PRIMARY, then we should only remove its
1831 * promisc and mc settings if it was the curr_active_slave, but that was
1832 * already taken care of above when we detached the slave
1833 */
1834 if (!USES_PRIMARY(bond->params.mode)) {
1835 /* unset promiscuity level from slave */
1836 if (bond_dev->flags & IFF_PROMISC) {
1837 dev_set_promiscuity(slave_dev, -1);
1838 }
1839
1840 /* unset allmulti level from slave */
1841 if (bond_dev->flags & IFF_ALLMULTI) {
1842 dev_set_allmulti(slave_dev, -1);
1843 }
1844
1845 /* flush master's mc_list from slave */
1846 bond_mc_list_flush(bond_dev, slave_dev);
1847 }
1848
1849 netdev_set_master(slave_dev, NULL);
1850
1851 /* close slave before restoring its mac address */
1852 dev_close(slave_dev);
1853
217df670
JV		 1854 /* restore original ("permanent") mac address*/
1855 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1856 addr.sa_family = slave_dev->type;
1857 dev_set_mac_address(slave_dev, &addr);
1da177e4 1858
8f903c70
JV		 1859 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1860 IFF_SLAVE_INACTIVE);
1da177e4
LT		 1861
1862 kfree(slave);
1863
1864 /* re-acquire the lock before getting the next slave */
1865 write_lock_bh(&bond->lock);
1866 }
1867
1868 /* zero the mac address of the master so it will be
1869 * set by the application to the mac address of the
1870 * first slave
1871 */
1872 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1873
1874 if (list_empty(&bond->vlan_list)) {
1875 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1876 } else {
1877 printk(KERN_WARNING DRV_NAME
4e0952c7 1878 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1879 "still has VLANs.\n",
4e0952c7 1880 bond_dev->name, bond_dev->name);
1da177e4 1881 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1882 ": %s: When re-adding slaves, make sure the bond's "
1883 "HW address matches its VLANs'.\n",
1884 bond_dev->name);
1da177e4
LT		 1885 }
1886
1887 printk(KERN_INFO DRV_NAME
1888 ": %s: released all slaves\n",
1889 bond_dev->name);
1890
1891out:
1892 write_unlock_bh(&bond->lock);
1893
1894 return 0;
1895}
1896
1897/*
1898 * This function changes the active slave to slave <slave_dev>.
1899 * It returns -EINVAL in the following cases.
1900 * - <slave_dev> is not found in the list.
1901 * - There is not active slave now.
1902 * - <slave_dev> is already active.
1903 * - The link state of <slave_dev> is not BOND_LINK_UP.
1904 * - <slave_dev> is not running.
1905 * In these cases, this fuction does nothing.
1906 * In the other cases, currnt_slave pointer is changed and 0 is returned.
1907 */
1908static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1909{
1910 struct bonding *bond = bond_dev->priv;
1911 struct slave *old_active = NULL;
1912 struct slave *new_active = NULL;
1913 int res = 0;
1914
1915 if (!USES_PRIMARY(bond->params.mode)) {
1916 return -EINVAL;
1917 }
1918
1919 /* Verify that master_dev is indeed the master of slave_dev */
1920 if (!(slave_dev->flags & IFF_SLAVE) ||
1921 (slave_dev->master != bond_dev)) {
1922 return -EINVAL;
1923 }
1924
1925 write_lock_bh(&bond->lock);
1926
1927 old_active = bond->curr_active_slave;
1928 new_active = bond_get_slave_by_dev(bond, slave_dev);
1929
1930 /*
1931 * Changing to the current active: do nothing; return success.
1932 */
1933 if (new_active && (new_active == old_active)) {
1934 write_unlock_bh(&bond->lock);
1935 return 0;
1936 }
1937
1938 if ((new_active) &&
1939 (old_active) &&
1940 (new_active->link == BOND_LINK_UP) &&
1941 IS_UP(new_active->dev)) {
1942 bond_change_active_slave(bond, new_active);
1943 } else {
1944 res = -EINVAL;
1945 }
1946
1947 write_unlock_bh(&bond->lock);
1948
1949 return res;
1950}
1951
1da177e4
LT		 1952static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1953{
1954 struct bonding *bond = bond_dev->priv;
1955
1956 info->bond_mode = bond->params.mode;
1957 info->miimon = bond->params.miimon;
1958
1959 read_lock_bh(&bond->lock);
1960 info->num_slaves = bond->slave_cnt;
1961 read_unlock_bh(&bond->lock);
1962
1963 return 0;
1964}
1965
1966static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1967{
1968 struct bonding *bond = bond_dev->priv;
1969 struct slave *slave;
1970 int i, found = 0;
1971
1972 if (info->slave_id < 0) {
1973 return -ENODEV;
1974 }
1975
1976 read_lock_bh(&bond->lock);
1977
1978 bond_for_each_slave(bond, slave, i) {
1979 if (i == (int)info->slave_id) {
1980 found = 1;
1981 break;
1982 }
1983 }
1984
1985 read_unlock_bh(&bond->lock);
1986
1987 if (found) {
1988 strcpy(info->slave_name, slave->dev->name);
1989 info->link = slave->link;
1990 info->state = slave->state;
1991 info->link_failure_count = slave->link_failure_count;
1992 } else {
1993 return -ENODEV;
1994 }
1995
1996 return 0;
1997}
1998
1999/*-------------------------------- Monitoring -------------------------------*/
2000
2001/* this function is called regularly to monitor each slave's link. */
a77b5325 2002void bond_mii_monitor(struct net_device *bond_dev)
1da177e4
LT		 2003{
2004 struct bonding *bond = bond_dev->priv;
2005 struct slave *slave, *oldcurrent;
2006 int do_failover = 0;
2007 int delta_in_ticks;
2008 int i;
2009
2010 read_lock(&bond->lock);
2011
2012 delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2013
2014 if (bond->kill_timers) {
2015 goto out;
2016 }
2017
2018 if (bond->slave_cnt == 0) {
2019 goto re_arm;
2020 }
2021
2022 /* we will try to read the link status of each of our slaves, and
2023 * set their IFF_RUNNING flag appropriately. For each slave not
2024 * supporting MII status, we won't do anything so that a user-space
2025 * program could monitor the link itself if needed.
2026 */
2027
2028 read_lock(&bond->curr_slave_lock);
2029 oldcurrent = bond->curr_active_slave;
2030 read_unlock(&bond->curr_slave_lock);
2031
2032 bond_for_each_slave(bond, slave, i) {
2033 struct net_device *slave_dev = slave->dev;
2034 int link_state;
2035 u16 old_speed = slave->speed;
2036 u8 old_duplex = slave->duplex;
2037
2038 link_state = bond_check_dev_link(bond, slave_dev, 0);
2039
2040 switch (slave->link) {
2041 case BOND_LINK_UP: /* the link was up */
2042 if (link_state == BMSR_LSTATUS) {
2043 /* link stays up, nothing more to do */
2044 break;
2045 } else { /* link going down */
2046 slave->link = BOND_LINK_FAIL;
2047 slave->delay = bond->params.downdelay;
2048
2049 if (slave->link_failure_count < UINT_MAX) {
2050 slave->link_failure_count++;
2051 }
2052
2053 if (bond->params.downdelay) {
2054 printk(KERN_INFO DRV_NAME
2055 ": %s: link status down for %s "
2056 "interface %s, disabling it in "
2057 "%d ms.\n",
2058 bond_dev->name,
2059 IS_UP(slave_dev)
2060 ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2061 ? ((slave == oldcurrent)
2062 ? "active " : "backup ")
2063 : "")
2064 : "idle ",
2065 slave_dev->name,
2066 bond->params.downdelay * bond->params.miimon);
2067 }
2068 }
2069 /* no break ! fall through the BOND_LINK_FAIL test to
2070 ensure proper action to be taken
2071 */
2072 case BOND_LINK_FAIL: /* the link has just gone down */
2073 if (link_state != BMSR_LSTATUS) {
2074 /* link stays down */
2075 if (slave->delay <= 0) {
2076 /* link down for too long time */
2077 slave->link = BOND_LINK_DOWN;
2078
2079 /* in active/backup mode, we must
2080 * completely disable this interface
2081 */
2082 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2083 (bond->params.mode == BOND_MODE_8023AD)) {
2084 bond_set_slave_inactive_flags(slave);
2085 }
2086
2087 printk(KERN_INFO DRV_NAME
2088 ": %s: link status definitely "
2089 "down for interface %s, "
2090 "disabling it\n",
2091 bond_dev->name,
2092 slave_dev->name);
2093
2094 /* notify ad that the link status has changed */
2095 if (bond->params.mode == BOND_MODE_8023AD) {
2096 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2097 }
2098
2099 if ((bond->params.mode == BOND_MODE_TLB) ||
2100 (bond->params.mode == BOND_MODE_ALB)) {
2101 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2102 }
2103
2104 if (slave == oldcurrent) {
2105 do_failover = 1;
2106 }
2107 } else {
2108 slave->delay--;
2109 }
2110 } else {
2111 /* link up again */
2112 slave->link = BOND_LINK_UP;
2113 slave->jiffies = jiffies;
2114 printk(KERN_INFO DRV_NAME
2115 ": %s: link status up again after %d "
2116 "ms for interface %s.\n",
2117 bond_dev->name,
2118 (bond->params.downdelay - slave->delay) * bond->params.miimon,
2119 slave_dev->name);
2120 }
2121 break;
2122 case BOND_LINK_DOWN: /* the link was down */
2123 if (link_state != BMSR_LSTATUS) {
2124 /* the link stays down, nothing more to do */
2125 break;
2126 } else { /* link going up */
2127 slave->link = BOND_LINK_BACK;
2128 slave->delay = bond->params.updelay;
2129
2130 if (bond->params.updelay) {
2131 /* if updelay == 0, no need to
2132 advertise about a 0 ms delay */
2133 printk(KERN_INFO DRV_NAME
2134 ": %s: link status up for "
2135 "interface %s, enabling it "
2136 "in %d ms.\n",
2137 bond_dev->name,
2138 slave_dev->name,
2139 bond->params.updelay * bond->params.miimon);
2140 }
2141 }
2142 /* no break ! fall through the BOND_LINK_BACK state in
2143 case there's something to do.
2144 */
2145 case BOND_LINK_BACK: /* the link has just come back */
2146 if (link_state != BMSR_LSTATUS) {
2147 /* link down again */
2148 slave->link = BOND_LINK_DOWN;
2149
2150 printk(KERN_INFO DRV_NAME
2151 ": %s: link status down again after %d "
2152 "ms for interface %s.\n",
2153 bond_dev->name,
2154 (bond->params.updelay - slave->delay) * bond->params.miimon,
2155 slave_dev->name);
2156 } else {
2157 /* link stays up */
2158 if (slave->delay == 0) {
2159 /* now the link has been up for long time enough */
2160 slave->link = BOND_LINK_UP;
2161 slave->jiffies = jiffies;
2162
2163 if (bond->params.mode == BOND_MODE_8023AD) {
2164 /* prevent it from being the active one */
2165 slave->state = BOND_STATE_BACKUP;
2166 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2167 /* make it immediately active */
2168 slave->state = BOND_STATE_ACTIVE;
2169 } else if (slave != bond->primary_slave) {
2170 /* prevent it from being the active one */
2171 slave->state = BOND_STATE_BACKUP;
2172 }
2173
2174 printk(KERN_INFO DRV_NAME
2175 ": %s: link status definitely "
2176 "up for interface %s.\n",
2177 bond_dev->name,
2178 slave_dev->name);
2179
2180 /* notify ad that the link status has changed */
2181 if (bond->params.mode == BOND_MODE_8023AD) {
2182 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2183 }
2184
2185 if ((bond->params.mode == BOND_MODE_TLB) ||
2186 (bond->params.mode == BOND_MODE_ALB)) {
2187 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2188 }
2189
2190 if ((!oldcurrent) ||
2191 (slave == bond->primary_slave)) {
2192 do_failover = 1;
2193 }
2194 } else {
2195 slave->delay--;
2196 }
2197 }
2198 break;
2199 default:
2200 /* Should not happen */
4e0952c7
MW		 2201 printk(KERN_ERR DRV_NAME
2202 ": %s: Error: %s Illegal value (link=%d)\n",
2203 bond_dev->name,
2204 slave->dev->name,
2205 slave->link);
1da177e4
LT		 2206 goto out;
2207 } /* end of switch (slave->link) */
2208
2209 bond_update_speed_duplex(slave);
2210
2211 if (bond->params.mode == BOND_MODE_8023AD) {
2212 if (old_speed != slave->speed) {
2213 bond_3ad_adapter_speed_changed(slave);
2214 }
2215
2216 if (old_duplex != slave->duplex) {
2217 bond_3ad_adapter_duplex_changed(slave);
2218 }
2219 }
2220
2221 } /* end of for */
2222
2223 if (do_failover) {
2224 write_lock(&bond->curr_slave_lock);
2225
2226 bond_select_active_slave(bond);
2227
1da177e4 2228 write_unlock(&bond->curr_slave_lock);
ff59c456
JV		 2229 } else
2230 bond_set_carrier(bond);
1da177e4
LT		 2231
2232re_arm:
2233 if (bond->params.miimon) {
2234 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2235 }
2236out:
2237 read_unlock(&bond->lock);
2238}
2239
c3ade5ca
JV		 2240
2241static u32 bond_glean_dev_ip(struct net_device *dev)
2242{
2243 struct in_device *idev;
2244 struct in_ifaddr *ifa;
a144ea4b 2245 __be32 addr = 0;
c3ade5ca
JV		 2246
2247 if (!dev)
2248 return 0;
2249
2250 rcu_read_lock();
e5ed6399 2251 idev = __in_dev_get_rcu(dev);
c3ade5ca
JV		 2252 if (!idev)
2253 goto out;
2254
2255 ifa = idev->ifa_list;
2256 if (!ifa)
2257 goto out;
2258
2259 addr = ifa->ifa_local;
2260out:
2261 rcu_read_unlock();
2262 return addr;
2263}
2264
2265static int bond_has_ip(struct bonding *bond)
2266{
2267 struct vlan_entry *vlan, *vlan_next;
2268
2269 if (bond->master_ip)
2270 return 1;
2271
2272 if (list_empty(&bond->vlan_list))
2273 return 0;
2274
2275 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2276 vlan_list) {
2277 if (vlan->vlan_ip)
2278 return 1;
2279 }
2280
2281 return 0;
2282}
2283
f5b2b966
JV		 2284static int bond_has_this_ip(struct bonding *bond, u32 ip)
2285{
2286 struct vlan_entry *vlan, *vlan_next;
2287
2288 if (ip == bond->master_ip)
2289 return 1;
2290
2291 if (list_empty(&bond->vlan_list))
2292 return 0;
2293
2294 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2295 vlan_list) {
2296 if (ip == vlan->vlan_ip)
2297 return 1;
2298 }
2299
2300 return 0;
2301}
2302
c3ade5ca
JV		 2303/*
2304 * We go to the (large) trouble of VLAN tagging ARP frames because
2305 * switches in VLAN mode (especially if ports are configured as
2306 * "native" to a VLAN) might not pass non-tagged frames.
2307 */
2308static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2309{
2310 struct sk_buff *skb;
2311
2312 dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2313 slave_dev->name, dest_ip, src_ip, vlan_id);
2314
2315 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2316 NULL, slave_dev->dev_addr, NULL);
2317
2318 if (!skb) {
2319 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2320 return;
2321 }
2322 if (vlan_id) {
2323 skb = vlan_put_tag(skb, vlan_id);
2324 if (!skb) {
2325 printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2326 return;
2327 }
2328 }
2329 arp_xmit(skb);
2330}
2331
2332
1da177e4
LT		 2333static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2334{
c3ade5ca 2335 int i, vlan_id, rv;
1da177e4 2336 u32 *targets = bond->params.arp_targets;
c3ade5ca
JV		 2337 struct vlan_entry *vlan, *vlan_next;
2338 struct net_device *vlan_dev;
2339 struct flowi fl;
2340 struct rtable *rt;
1da177e4 2341
6b780567
MW		 2342 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2343 if (!targets[i])
2344 continue;
c3ade5ca
JV		 2345 dprintk("basa: target %x\n", targets[i]);
2346 if (list_empty(&bond->vlan_list)) {
2347 dprintk("basa: empty vlan: arp_send\n");
2348 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2349 bond->master_ip, 0);
2350 continue;
2351 }
2352
2353 /*
2354 * If VLANs are configured, we do a route lookup to
2355 * determine which VLAN interface would be used, so we
2356 * can tag the ARP with the proper VLAN tag.
2357 */
2358 memset(&fl, 0, sizeof(fl));
2359 fl.fl4_dst = targets[i];
2360 fl.fl4_tos = RTO_ONLINK;
2361
2362 rv = ip_route_output_key(&rt, &fl);
2363 if (rv) {
2364 if (net_ratelimit()) {
2365 printk(KERN_WARNING DRV_NAME
2366 ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2367 bond->dev->name, NIPQUAD(fl.fl4_dst));
2368 }
2369 continue;
2370 }
2371
2372 /*
2373 * This target is not on a VLAN
2374 */
2375 if (rt->u.dst.dev == bond->dev) {
ed4b9f80 2376 ip_rt_put(rt);
c3ade5ca
JV		 2377 dprintk("basa: rtdev == bond->dev: arp_send\n");
2378 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2379 bond->master_ip, 0);
2380 continue;
2381 }
2382
2383 vlan_id = 0;
2384 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2385 vlan_list) {
5c15bdec 2386 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 2387 if (vlan_dev == rt->u.dst.dev) {
2388 vlan_id = vlan->vlan_id;
2389 dprintk("basa: vlan match on %s %d\n",
2390 vlan_dev->name, vlan_id);
2391 break;
2392 }
2393 }
2394
2395 if (vlan_id) {
ed4b9f80 2396 ip_rt_put(rt);
c3ade5ca
JV		 2397 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2398 vlan->vlan_ip, vlan_id);
2399 continue;
2400 }
2401
2402 if (net_ratelimit()) {
2403 printk(KERN_WARNING DRV_NAME
2404 ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2405 bond->dev->name, NIPQUAD(fl.fl4_dst),
2406 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2407 }
ed4b9f80 2408 ip_rt_put(rt);
c3ade5ca
JV		 2409 }
2410}
2411
2412/*
2413 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2414 * for each VLAN above us.
2415 */
2416static void bond_send_gratuitous_arp(struct bonding *bond)
2417{
2418 struct slave *slave = bond->curr_active_slave;
2419 struct vlan_entry *vlan;
2420 struct net_device *vlan_dev;
2421
2422 dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2423 slave ? slave->dev->name : "NULL");
2424 if (!slave)
2425 return;
2426
2427 if (bond->master_ip) {
2428 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2429 bond->master_ip, 0);
2430 }
2431
2432 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
5c15bdec 2433 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 2434 if (vlan->vlan_ip) {
2435 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2436 vlan->vlan_ip, vlan->vlan_id);
2437 }
1da177e4
LT		 2438 }
2439}
2440
f5b2b966
JV		 2441static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
2442{
2443 int i;
2444 u32 *targets = bond->params.arp_targets;
2445
2446 targets = bond->params.arp_targets;
2447 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2448 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2449 "%u.%u.%u.%u bhti(tip) %d\n",
2450 NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2451 bond_has_this_ip(bond, tip));
2452 if (sip == targets[i]) {
2453 if (bond_has_this_ip(bond, tip))
2454 slave->last_arp_rx = jiffies;
2455 return;
2456 }
2457 }
2458}
2459
2460static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2461{
2462 struct arphdr *arp;
2463 struct slave *slave;
2464 struct bonding *bond;
2465 unsigned char *arp_ptr;
2466 u32 sip, tip;
2467
2468 if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2469 goto out;
2470
2471 bond = dev->priv;
2472 read_lock(&bond->lock);
2473
2474 dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2475 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2476 orig_dev ? orig_dev->name : "NULL");
2477
2478 slave = bond_get_slave_by_dev(bond, orig_dev);
2479 if (!slave || !slave_do_arp_validate(bond, slave))
2480 goto out_unlock;
2481
2482 /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
2483 if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2484 (2 * dev->addr_len) +
2485 (2 * sizeof(u32)))))
2486 goto out_unlock;
2487
d0a92be0 2488 arp = arp_hdr(skb);
f5b2b966
JV		 2489 if (arp->ar_hln != dev->addr_len ||
2490 skb->pkt_type == PACKET_OTHERHOST ||
2491 skb->pkt_type == PACKET_LOOPBACK ||
2492 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2493 arp->ar_pro != htons(ETH_P_IP) ||
2494 arp->ar_pln != 4)
2495 goto out_unlock;
2496
2497 arp_ptr = (unsigned char *)(arp + 1);
2498 arp_ptr += dev->addr_len;
2499 memcpy(&sip, arp_ptr, 4);
2500 arp_ptr += 4 + dev->addr_len;
2501 memcpy(&tip, arp_ptr, 4);
2502
2503 dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2504 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2505 slave->state, bond->params.arp_validate,
2506 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2507
2508 /*
2509 * Backup slaves won't see the ARP reply, but do come through
2510 * here for each ARP probe (so we swap the sip/tip to validate
2511 * the probe). In a "redundant switch, common router" type of
2512 * configuration, the ARP probe will (hopefully) travel from
2513 * the active, through one switch, the router, then the other
2514 * switch before reaching the backup.
2515 */
2516 if (slave->state == BOND_STATE_ACTIVE)
2517 bond_validate_arp(bond, slave, sip, tip);
2518 else
2519 bond_validate_arp(bond, slave, tip, sip);
2520
2521out_unlock:
2522 read_unlock(&bond->lock);
2523out:
2524 dev_kfree_skb(skb);
2525 return NET_RX_SUCCESS;
2526}
2527
1da177e4
LT		 2528/*
2529 * this function is called regularly to monitor each slave's link
2530 * ensuring that traffic is being sent and received when arp monitoring
2531 * is used in load-balancing mode. if the adapter has been dormant, then an
2532 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2533 * arp monitoring in active backup mode.
2534 */
a77b5325 2535void bond_loadbalance_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2536{
2537 struct bonding *bond = bond_dev->priv;
2538 struct slave *slave, *oldcurrent;
2539 int do_failover = 0;
2540 int delta_in_ticks;
2541 int i;
2542
2543 read_lock(&bond->lock);
2544
2545 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2546
2547 if (bond->kill_timers) {
2548 goto out;
2549 }
2550
2551 if (bond->slave_cnt == 0) {
2552 goto re_arm;
2553 }
2554
2555 read_lock(&bond->curr_slave_lock);
2556 oldcurrent = bond->curr_active_slave;
2557 read_unlock(&bond->curr_slave_lock);
2558
2559 /* see if any of the previous devices are up now (i.e. they have
2560 * xmt and rcv traffic). the curr_active_slave does not come into
2561 * the picture unless it is null. also, slave->jiffies is not needed
2562 * here because we send an arp on each slave and give a slave as
2563 * long as it needs to get the tx/rx within the delta.
2564 * TODO: what about up/down delay in arp mode? it wasn't here before
2565 * so it can wait
2566 */
2567 bond_for_each_slave(bond, slave, i) {
2568 if (slave->link != BOND_LINK_UP) {
2569 if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2570 ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2571
2572 slave->link = BOND_LINK_UP;
2573 slave->state = BOND_STATE_ACTIVE;
2574
2575 /* primary_slave has no meaning in round-robin
2576 * mode. the window of a slave being up and
2577 * curr_active_slave being null after enslaving
2578 * is closed.
2579 */
2580 if (!oldcurrent) {
2581 printk(KERN_INFO DRV_NAME
2582 ": %s: link status definitely "
2583 "up for interface %s, ",
2584 bond_dev->name,
2585 slave->dev->name);
2586 do_failover = 1;
2587 } else {
2588 printk(KERN_INFO DRV_NAME
2589 ": %s: interface %s is now up\n",
2590 bond_dev->name,
2591 slave->dev->name);
2592 }
2593 }
2594 } else {
2595 /* slave->link == BOND_LINK_UP */
2596
2597 /* not all switches will respond to an arp request
2598 * when the source ip is 0, so don't take the link down
2599 * if we don't know our ip yet
2600 */
2601 if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2602 (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
c3ade5ca 2603 bond_has_ip(bond))) {
1da177e4
LT		 2604
2605 slave->link = BOND_LINK_DOWN;
2606 slave->state = BOND_STATE_BACKUP;
2607
2608 if (slave->link_failure_count < UINT_MAX) {
2609 slave->link_failure_count++;
2610 }
2611
2612 printk(KERN_INFO DRV_NAME
2613 ": %s: interface %s is now down.\n",
2614 bond_dev->name,
2615 slave->dev->name);
2616
2617 if (slave == oldcurrent) {
2618 do_failover = 1;
2619 }
2620 }
2621 }
2622
2623 /* note: if switch is in round-robin mode, all links
2624 * must tx arp to ensure all links rx an arp - otherwise
2625 * links may oscillate or not come up at all; if switch is
2626 * in something like xor mode, there is nothing we can
2627 * do - all replies will be rx'ed on same link causing slaves
2628 * to be unstable during low/no traffic periods
2629 */
2630 if (IS_UP(slave->dev)) {
2631 bond_arp_send_all(bond, slave);
2632 }
2633 }
2634
2635 if (do_failover) {
2636 write_lock(&bond->curr_slave_lock);
2637
2638 bond_select_active_slave(bond);
2639
1da177e4
LT		 2640 write_unlock(&bond->curr_slave_lock);
2641 }
2642
2643re_arm:
2644 if (bond->params.arp_interval) {
2645 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2646 }
2647out:
2648 read_unlock(&bond->lock);
2649}
2650
2651/*
2652 * When using arp monitoring in active-backup mode, this function is
2653 * called to determine if any backup slaves have went down or a new
2654 * current slave needs to be found.
2655 * The backup slaves never generate traffic, they are considered up by merely
2656 * receiving traffic. If the current slave goes down, each backup slave will
2657 * be given the opportunity to tx/rx an arp before being taken down - this
2658 * prevents all slaves from being taken down due to the current slave not
2659 * sending any traffic for the backups to receive. The arps are not necessarily
2660 * necessary, any tx and rx traffic will keep the current slave up. While any
2661 * rx traffic will keep the backup slaves up, the current slave is responsible
2662 * for generating traffic to keep them up regardless of any other traffic they
2663 * may have received.
2664 * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2665 */
a77b5325 2666void bond_activebackup_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2667{
2668 struct bonding *bond = bond_dev->priv;
2669 struct slave *slave;
2670 int delta_in_ticks;
2671 int i;
2672
2673 read_lock(&bond->lock);
2674
2675 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2676
2677 if (bond->kill_timers) {
2678 goto out;
2679 }
2680
2681 if (bond->slave_cnt == 0) {
2682 goto re_arm;
2683 }
2684
2685 /* determine if any slave has come up or any backup slave has
2686 * gone down
2687 * TODO: what about up/down delay in arp mode? it wasn't here before
2688 * so it can wait
2689 */
2690 bond_for_each_slave(bond, slave, i) {
2691 if (slave->link != BOND_LINK_UP) {
f5b2b966
JV		 2692 if ((jiffies - slave_last_rx(bond, slave)) <=
2693 delta_in_ticks) {
1da177e4
LT		 2694
2695 slave->link = BOND_LINK_UP;
2696
2697 write_lock(&bond->curr_slave_lock);
2698
2699 if ((!bond->curr_active_slave) &&
2700 ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2701 bond_change_active_slave(bond, slave);
2702 bond->current_arp_slave = NULL;
2703 } else if (bond->curr_active_slave != slave) {
2704 /* this slave has just come up but we
2705 * already have a current slave; this
2706 * can also happen if bond_enslave adds
2707 * a new slave that is up while we are
2708 * searching for a new slave
2709 */
2710 bond_set_slave_inactive_flags(slave);
2711 bond->current_arp_slave = NULL;
2712 }
2713
ff59c456
JV		 2714 bond_set_carrier(bond);
2715
1da177e4
LT		 2716 if (slave == bond->curr_active_slave) {
2717 printk(KERN_INFO DRV_NAME
2718 ": %s: %s is up and now the "
2719 "active interface\n",
2720 bond_dev->name,
2721 slave->dev->name);
ff59c456 2722 netif_carrier_on(bond->dev);
1da177e4
LT		 2723 } else {
2724 printk(KERN_INFO DRV_NAME
2725 ": %s: backup interface %s is "
2726 "now up\n",
2727 bond_dev->name,
2728 slave->dev->name);
2729 }
2730
2731 write_unlock(&bond->curr_slave_lock);
2732 }
2733 } else {
2734 read_lock(&bond->curr_slave_lock);
2735
2736 if ((slave != bond->curr_active_slave) &&
2737 (!bond->current_arp_slave) &&
f5b2b966 2738 (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
c3ade5ca 2739 bond_has_ip(bond))) {
1da177e4
LT		 2740 /* a backup slave has gone down; three times
2741 * the delta allows the current slave to be
2742 * taken out before the backup slave.
2743 * note: a non-null current_arp_slave indicates
2744 * the curr_active_slave went down and we are
2745 * searching for a new one; under this
2746 * condition we only take the curr_active_slave
2747 * down - this gives each slave a chance to
2748 * tx/rx traffic before being taken out
2749 */
2750
2751 read_unlock(&bond->curr_slave_lock);
2752
2753 slave->link = BOND_LINK_DOWN;
2754
2755 if (slave->link_failure_count < UINT_MAX) {
2756 slave->link_failure_count++;
2757 }
2758
2759 bond_set_slave_inactive_flags(slave);
2760
2761 printk(KERN_INFO DRV_NAME
2762 ": %s: backup interface %s is now down\n",
2763 bond_dev->name,
2764 slave->dev->name);
2765 } else {
2766 read_unlock(&bond->curr_slave_lock);
2767 }
2768 }
2769 }
2770
2771 read_lock(&bond->curr_slave_lock);
2772 slave = bond->curr_active_slave;
2773 read_unlock(&bond->curr_slave_lock);
2774
2775 if (slave) {
2776 /* if we have sent traffic in the past 2*arp_intervals but
2777 * haven't xmit and rx traffic in that time interval, select
2778 * a different slave. slave->jiffies is only updated when
2779 * a slave first becomes the curr_active_slave - not necessarily
2780 * after every arp; this ensures the slave has a full 2*delta
2781 * before being taken out. if a primary is being used, check
2782 * if it is up and needs to take over as the curr_active_slave
2783 */
2784 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
f5b2b966 2785 (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
c3ade5ca 2786 bond_has_ip(bond))) &&
1da177e4
LT		 2787 ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2788
2789 slave->link = BOND_LINK_DOWN;
2790
2791 if (slave->link_failure_count < UINT_MAX) {
2792 slave->link_failure_count++;
2793 }
2794
2795 printk(KERN_INFO DRV_NAME
2796 ": %s: link status down for active interface "
2797 "%s, disabling it\n",
2798 bond_dev->name,
2799 slave->dev->name);
2800
2801 write_lock(&bond->curr_slave_lock);
2802
2803 bond_select_active_slave(bond);
2804 slave = bond->curr_active_slave;
2805
2806 write_unlock(&bond->curr_slave_lock);
2807
2808 bond->current_arp_slave = slave;
2809
2810 if (slave) {
2811 slave->jiffies = jiffies;
2812 }
2813 } else if ((bond->primary_slave) &&
2814 (bond->primary_slave != slave) &&
2815 (bond->primary_slave->link == BOND_LINK_UP)) {
2816 /* at this point, slave is the curr_active_slave */
2817 printk(KERN_INFO DRV_NAME
2818 ": %s: changing from interface %s to primary "
2819 "interface %s\n",
2820 bond_dev->name,
2821 slave->dev->name,
2822 bond->primary_slave->dev->name);
2823
2824 /* primary is up so switch to it */
2825 write_lock(&bond->curr_slave_lock);
2826 bond_change_active_slave(bond, bond->primary_slave);
2827 write_unlock(&bond->curr_slave_lock);
2828
2829 slave = bond->primary_slave;
2830 slave->jiffies = jiffies;
2831 } else {
2832 bond->current_arp_slave = NULL;
2833 }
2834
2835 /* the current slave must tx an arp to ensure backup slaves
2836 * rx traffic
2837 */
c3ade5ca 2838 if (slave && bond_has_ip(bond)) {
1da177e4
LT		 2839 bond_arp_send_all(bond, slave);
2840 }
2841 }
2842
2843 /* if we don't have a curr_active_slave, search for the next available
2844 * backup slave from the current_arp_slave and make it the candidate
2845 * for becoming the curr_active_slave
2846 */
2847 if (!slave) {
2848 if (!bond->current_arp_slave) {
2849 bond->current_arp_slave = bond->first_slave;
2850 }
2851
2852 if (bond->current_arp_slave) {
2853 bond_set_slave_inactive_flags(bond->current_arp_slave);
2854
2855 /* search for next candidate */
2f872f04 2856 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
1da177e4
LT		 2857 if (IS_UP(slave->dev)) {
2858 slave->link = BOND_LINK_BACK;
2859 bond_set_slave_active_flags(slave);
2860 bond_arp_send_all(bond, slave);
2861 slave->jiffies = jiffies;
2862 bond->current_arp_slave = slave;
2863 break;
2864 }
2865
2866 /* if the link state is up at this point, we
2867 * mark it down - this can happen if we have
2868 * simultaneous link failures and
2869 * reselect_active_interface doesn't make this
2870 * one the current slave so it is still marked
2871 * up when it is actually down
2872 */
2873 if (slave->link == BOND_LINK_UP) {
2874 slave->link = BOND_LINK_DOWN;
2875 if (slave->link_failure_count < UINT_MAX) {
2876 slave->link_failure_count++;
2877 }
2878
2879 bond_set_slave_inactive_flags(slave);
2880
2881 printk(KERN_INFO DRV_NAME
2882 ": %s: backup interface %s is "
2883 "now down.\n",
2884 bond_dev->name,
2885 slave->dev->name);
2886 }
2887 }
2888 }
2889 }
2890
2891re_arm:
2892 if (bond->params.arp_interval) {
2893 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2894 }
2895out:
2896 read_unlock(&bond->lock);
2897}
2898
2899/*------------------------------ proc/seq_file-------------------------------*/
2900
2901#ifdef CONFIG_PROC_FS
2902
2903#define SEQ_START_TOKEN ((void *)1)
2904
2905static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2906{
2907 struct bonding *bond = seq->private;
2908 loff_t off = 0;
2909 struct slave *slave;
2910 int i;
2911
2912 /* make sure the bond won't be taken away */
2913 read_lock(&dev_base_lock);
2914 read_lock_bh(&bond->lock);
2915
2916 if (*pos == 0) {
2917 return SEQ_START_TOKEN;
2918 }
2919
2920 bond_for_each_slave(bond, slave, i) {
2921 if (++off == *pos) {
2922 return slave;
2923 }
2924 }
2925
2926 return NULL;
2927}
2928
2929static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2930{
2931 struct bonding *bond = seq->private;
2932 struct slave *slave = v;
2933
2934 ++*pos;
2935 if (v == SEQ_START_TOKEN) {
2936 return bond->first_slave;
2937 }
2938
2939 slave = slave->next;
2940
2941 return (slave == bond->first_slave) ? NULL : slave;
2942}
2943
2944static void bond_info_seq_stop(struct seq_file *seq, void *v)
2945{
2946 struct bonding *bond = seq->private;
2947
2948 read_unlock_bh(&bond->lock);
2949 read_unlock(&dev_base_lock);
2950}
2951
2952static void bond_info_show_master(struct seq_file *seq)
2953{
2954 struct bonding *bond = seq->private;
2955 struct slave *curr;
4756b02f
MW		 2956 int i;
2957 u32 target;
1da177e4
LT		 2958
2959 read_lock(&bond->curr_slave_lock);
2960 curr = bond->curr_active_slave;
2961 read_unlock(&bond->curr_slave_lock);
2962
2963 seq_printf(seq, "Bonding Mode: %s\n",
2964 bond_mode_name(bond->params.mode));
2965
c61b75ad
MW		 2966 if (bond->params.mode == BOND_MODE_XOR ||
2967 bond->params.mode == BOND_MODE_8023AD) {
2968 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2969 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2970 bond->params.xmit_policy);
2971 }
2972
1da177e4
LT		 2973 if (USES_PRIMARY(bond->params.mode)) {
2974 seq_printf(seq, "Primary Slave: %s\n",
0f418b2a
MW		 2975 (bond->primary_slave) ?
2976 bond->primary_slave->dev->name : "None");
1da177e4
LT		 2977
2978 seq_printf(seq, "Currently Active Slave: %s\n",
2979 (curr) ? curr->dev->name : "None");
2980 }
2981
ff59c456
JV		 2982 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2983 "up" : "down");
1da177e4
LT		 2984 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2985 seq_printf(seq, "Up Delay (ms): %d\n",
2986 bond->params.updelay * bond->params.miimon);
2987 seq_printf(seq, "Down Delay (ms): %d\n",
2988 bond->params.downdelay * bond->params.miimon);
2989
4756b02f
MW		 2990
2991 /* ARP information */
2992 if(bond->params.arp_interval > 0) {
2993 int printed=0;
2994 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2995 bond->params.arp_interval);
2996
2997 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2998
2999 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3000 if (!bond->params.arp_targets[i])
3001 continue;
3002 if (printed)
3003 seq_printf(seq, ",");
3004 target = ntohl(bond->params.arp_targets[i]);
3005 seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3006 printed = 1;
3007 }
3008 seq_printf(seq, "\n");
3009 }
3010
1da177e4
LT		 3011 if (bond->params.mode == BOND_MODE_8023AD) {
3012 struct ad_info ad_info;
3013
3014 seq_puts(seq, "\n802.3ad info\n");
3015 seq_printf(seq, "LACP rate: %s\n",
3016 (bond->params.lacp_fast) ? "fast" : "slow");
3017
3018 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3019 seq_printf(seq, "bond %s has no active aggregator\n",
3020 bond->dev->name);
3021 } else {
3022 seq_printf(seq, "Active Aggregator Info:\n");
3023
3024 seq_printf(seq, "\tAggregator ID: %d\n",
3025 ad_info.aggregator_id);
3026 seq_printf(seq, "\tNumber of ports: %d\n",
3027 ad_info.ports);
3028 seq_printf(seq, "\tActor Key: %d\n",
3029 ad_info.actor_key);
3030 seq_printf(seq, "\tPartner Key: %d\n",
3031 ad_info.partner_key);
3032 seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
3033 ad_info.partner_system[0],
3034 ad_info.partner_system[1],
3035 ad_info.partner_system[2],
3036 ad_info.partner_system[3],
3037 ad_info.partner_system[4],
3038 ad_info.partner_system[5]);
3039 }
3040 }
3041}
3042
3043static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3044{
3045 struct bonding *bond = seq->private;
3046
3047 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3048 seq_printf(seq, "MII Status: %s\n",
3049 (slave->link == BOND_LINK_UP) ? "up" : "down");
65509645 3050 seq_printf(seq, "Link Failure Count: %u\n",
1da177e4
LT		 3051 slave->link_failure_count);
3052
217df670
JV		 3053 seq_printf(seq,
3054 "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
3055 slave->perm_hwaddr[0], slave->perm_hwaddr[1],
3056 slave->perm_hwaddr[2], slave->perm_hwaddr[3],
3057 slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
1da177e4
LT		 3058
3059 if (bond->params.mode == BOND_MODE_8023AD) {
3060 const struct aggregator *agg
3061 = SLAVE_AD_INFO(slave).port.aggregator;
3062
3063 if (agg) {
3064 seq_printf(seq, "Aggregator ID: %d\n",
3065 agg->aggregator_identifier);
3066 } else {
3067 seq_puts(seq, "Aggregator ID: N/A\n");
3068 }
3069 }
3070}
3071
3072static int bond_info_seq_show(struct seq_file *seq, void *v)
3073{
3074 if (v == SEQ_START_TOKEN) {
3075 seq_printf(seq, "%s\n", version);
3076 bond_info_show_master(seq);
3077 } else {
3078 bond_info_show_slave(seq, v);
3079 }
3080
3081 return 0;
3082}
3083
3084static struct seq_operations bond_info_seq_ops = {
3085 .start = bond_info_seq_start,
3086 .next = bond_info_seq_next,
3087 .stop = bond_info_seq_stop,
3088 .show = bond_info_seq_show,
3089};
3090
3091static int bond_info_open(struct inode *inode, struct file *file)
3092{
3093 struct seq_file *seq;
3094 struct proc_dir_entry *proc;
3095 int res;
3096
3097 res = seq_open(file, &bond_info_seq_ops);
3098 if (!res) {
3099 /* recover the pointer buried in proc_dir_entry data */
3100 seq = file->private_data;
3101 proc = PDE(inode);
3102 seq->private = proc->data;
3103 }
3104
3105 return res;
3106}
3107
d54b1fdb 3108static const struct file_operations bond_info_fops = {
1da177e4
LT		 3109 .owner = THIS_MODULE,
3110 .open = bond_info_open,
3111 .read = seq_read,
3112 .llseek = seq_lseek,
3113 .release = seq_release,
3114};
3115
3116static int bond_create_proc_entry(struct bonding *bond)
3117{
3118 struct net_device *bond_dev = bond->dev;
3119
3120 if (bond_proc_dir) {
3121 bond->proc_entry = create_proc_entry(bond_dev->name,
3122 S_IRUGO,
3123 bond_proc_dir);
3124 if (bond->proc_entry == NULL) {
3125 printk(KERN_WARNING DRV_NAME
3126 ": Warning: Cannot create /proc/net/%s/%s\n",
3127 DRV_NAME, bond_dev->name);
3128 } else {
3129 bond->proc_entry->data = bond;
3130 bond->proc_entry->proc_fops = &bond_info_fops;
3131 bond->proc_entry->owner = THIS_MODULE;
3132 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3133 }
3134 }
3135
3136 return 0;
3137}
3138
3139static void bond_remove_proc_entry(struct bonding *bond)
3140{
3141 if (bond_proc_dir && bond->proc_entry) {
3142 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3143 memset(bond->proc_file_name, 0, IFNAMSIZ);
3144 bond->proc_entry = NULL;
3145 }
3146}
3147
3148/* Create the bonding directory under /proc/net, if doesn't exist yet.
3149 * Caller must hold rtnl_lock.
3150 */
3151static void bond_create_proc_dir(void)
3152{
3153 int len = strlen(DRV_NAME);
3154
3155 for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
3156 bond_proc_dir = bond_proc_dir->next) {
3157 if ((bond_proc_dir->namelen == len) &&
3158 !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3159 break;
3160 }
3161 }
3162
3163 if (!bond_proc_dir) {
3164 bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
3165 if (bond_proc_dir) {
3166 bond_proc_dir->owner = THIS_MODULE;
3167 } else {
3168 printk(KERN_WARNING DRV_NAME
3169 ": Warning: cannot create /proc/net/%s\n",
3170 DRV_NAME);
3171 }
3172 }
3173}
3174
3175/* Destroy the bonding directory under /proc/net, if empty.
3176 * Caller must hold rtnl_lock.
3177 */
3178static void bond_destroy_proc_dir(void)
3179{
3180 struct proc_dir_entry *de;
3181
3182 if (!bond_proc_dir) {
3183 return;
3184 }
3185
3186 /* verify that the /proc dir is empty */
3187 for (de = bond_proc_dir->subdir; de; de = de->next) {
3188 /* ignore . and .. */
3189 if (*(de->name) != '.') {
3190 break;
3191 }
3192 }
3193
3194 if (de) {
3195 if (bond_proc_dir->owner == THIS_MODULE) {
3196 bond_proc_dir->owner = NULL;
3197 }
3198 } else {
3199 remove_proc_entry(DRV_NAME, proc_net);
3200 bond_proc_dir = NULL;
3201 }
3202}
3203#endif /* CONFIG_PROC_FS */
3204
3205/*-------------------------- netdev event handling --------------------------*/
3206
3207/*
3208 * Change device name
3209 */
3210static int bond_event_changename(struct bonding *bond)
3211{
3212#ifdef CONFIG_PROC_FS
3213 bond_remove_proc_entry(bond);
3214 bond_create_proc_entry(bond);
3215#endif
b76cdba9
MW		 3216 down_write(&(bonding_rwsem));
3217 bond_destroy_sysfs_entry(bond);
3218 bond_create_sysfs_entry(bond);
3219 up_write(&(bonding_rwsem));
1da177e4
LT		 3220 return NOTIFY_DONE;
3221}
3222
3223static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3224{
3225 struct bonding *event_bond = bond_dev->priv;
3226
3227 switch (event) {
3228 case NETDEV_CHANGENAME:
3229 return bond_event_changename(event_bond);
3230 case NETDEV_UNREGISTER:
3231 /*
3232 * TODO: remove a bond from the list?
3233 */
3234 break;
3235 default:
3236 break;
3237 }
3238
3239 return NOTIFY_DONE;
3240}
3241
3242static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3243{
3244 struct net_device *bond_dev = slave_dev->master;
8531c5ff 3245 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3246
3247 switch (event) {
3248 case NETDEV_UNREGISTER:
3249 if (bond_dev) {
3250 bond_release(bond_dev, slave_dev);
3251 }
3252 break;
3253 case NETDEV_CHANGE:
3254 /*
3255 * TODO: is this what we get if somebody
3256 * sets up a hierarchical bond, then rmmod's
3257 * one of the slave bonding devices?
3258 */
3259 break;
3260 case NETDEV_DOWN:
3261 /*
3262 * ... Or is it this?
3263 */
3264 break;
3265 case NETDEV_CHANGEMTU:
3266 /*
3267 * TODO: Should slaves be allowed to
3268 * independently alter their MTU? For
3269 * an active-backup bond, slaves need
3270 * not be the same type of device, so
3271 * MTUs may vary. For other modes,
3272 * slaves arguably should have the
3273 * same MTUs. To do this, we'd need to
3274 * take over the slave's change_mtu
3275 * function for the duration of their
3276 * servitude.
3277 */
3278 break;
3279 case NETDEV_CHANGENAME:
3280 /*
3281 * TODO: handle changing the primary's name
3282 */
3283 break;
8531c5ff
AK		 3284 case NETDEV_FEAT_CHANGE:
3285 bond_compute_features(bond);
3286 break;
1da177e4
LT		 3287 default:
3288 break;
3289 }
3290
3291 return NOTIFY_DONE;
3292}
3293
3294/*
3295 * bond_netdev_event: handle netdev notifier chain events.
3296 *
3297 * This function receives events for the netdev chain. The caller (an
e041c683 3298 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
1da177e4
LT		 3299 * locks for us to safely manipulate the slave devices (RTNL lock,
3300 * dev_probe_lock).
3301 */
3302static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3303{
3304 struct net_device *event_dev = (struct net_device *)ptr;
3305
3306 dprintk("event_dev: %s, event: %lx\n",
3307 (event_dev ? event_dev->name : "None"),
3308 event);
3309
0b680e75
JV		 3310 if (!(event_dev->priv_flags & IFF_BONDING))
3311 return NOTIFY_DONE;
3312
1da177e4
LT		 3313 if (event_dev->flags & IFF_MASTER) {
3314 dprintk("IFF_MASTER\n");
3315 return bond_master_netdev_event(event, event_dev);
3316 }
3317
3318 if (event_dev->flags & IFF_SLAVE) {
3319 dprintk("IFF_SLAVE\n");
3320 return bond_slave_netdev_event(event, event_dev);
3321 }
3322
3323 return NOTIFY_DONE;
3324}
3325
c3ade5ca
JV		 3326/*
3327 * bond_inetaddr_event: handle inetaddr notifier chain events.
3328 *
3329 * We keep track of device IPs primarily to use as source addresses in
3330 * ARP monitor probes (rather than spewing out broadcasts all the time).
3331 *
3332 * We track one IP for the main device (if it has one), plus one per VLAN.
3333 */
3334static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3335{
3336 struct in_ifaddr *ifa = ptr;
3337 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3338 struct bonding *bond, *bond_next;
3339 struct vlan_entry *vlan, *vlan_next;
3340
3341 list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3342 if (bond->dev == event_dev) {
3343 switch (event) {
3344 case NETDEV_UP:
3345 bond->master_ip = ifa->ifa_local;
3346 return NOTIFY_OK;
3347 case NETDEV_DOWN:
3348 bond->master_ip = bond_glean_dev_ip(bond->dev);
3349 return NOTIFY_OK;
3350 default:
3351 return NOTIFY_DONE;
3352 }
3353 }
3354
3355 if (list_empty(&bond->vlan_list))
3356 continue;
3357
3358 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3359 vlan_list) {
5c15bdec 3360 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 3361 if (vlan_dev == event_dev) {
3362 switch (event) {
3363 case NETDEV_UP:
3364 vlan->vlan_ip = ifa->ifa_local;
3365 return NOTIFY_OK;
3366 case NETDEV_DOWN:
3367 vlan->vlan_ip =
3368 bond_glean_dev_ip(vlan_dev);
3369 return NOTIFY_OK;
3370 default:
3371 return NOTIFY_DONE;
3372 }
3373 }
3374 }
3375 }
3376 return NOTIFY_DONE;
3377}
3378
1da177e4
LT		 3379static struct notifier_block bond_netdev_notifier = {
3380 .notifier_call = bond_netdev_event,
3381};
3382
c3ade5ca
JV		 3383static struct notifier_block bond_inetaddr_notifier = {
3384 .notifier_call = bond_inetaddr_event,
3385};
3386
1da177e4
LT		 3387/*-------------------------- Packet type handling ---------------------------*/
3388
3389/* register to receive lacpdus on a bond */
3390static void bond_register_lacpdu(struct bonding *bond)
3391{
3392 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3393
3394 /* initialize packet type */
3395 pk_type->type = PKT_TYPE_LACPDU;
3396 pk_type->dev = bond->dev;
3397 pk_type->func = bond_3ad_lacpdu_recv;
3398
3399 dev_add_pack(pk_type);
3400}
3401
3402/* unregister to receive lacpdus on a bond */
3403static void bond_unregister_lacpdu(struct bonding *bond)
3404{
3405 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3406}
3407
f5b2b966
JV		 3408void bond_register_arp(struct bonding *bond)
3409{
3410 struct packet_type *pt = &bond->arp_mon_pt;
3411
c4f283b1
JV		 3412 if (pt->type)
3413 return;
3414
f5b2b966 3415 pt->type = htons(ETH_P_ARP);
e245cb71 3416 pt->dev = bond->dev;
f5b2b966
JV		 3417 pt->func = bond_arp_rcv;
3418 dev_add_pack(pt);
3419}
3420
3421void bond_unregister_arp(struct bonding *bond)
3422{
c4f283b1
JV		 3423 struct packet_type *pt = &bond->arp_mon_pt;
3424
3425 dev_remove_pack(pt);
3426 pt->type = 0;
f5b2b966
JV		 3427}
3428
169a3e66
JV		 3429/*---------------------------- Hashing Policies -----------------------------*/
3430
3431/*
59c51591 3432 * Hash for the output device based upon layer 3 and layer 4 data. If
169a3e66
JV		 3433 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3434 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3435 */
3436static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3437 struct net_device *bond_dev, int count)
3438{
3439 struct ethhdr *data = (struct ethhdr *)skb->data;
eddc9ec5 3440 struct iphdr *iph = ip_hdr(skb);
169a3e66
JV		 3441 u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3442 int layer4_xor = 0;
3443
3444 if (skb->protocol == __constant_htons(ETH_P_IP)) {
3445 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3446 (iph->protocol == IPPROTO_TCP ||
3447 iph->protocol == IPPROTO_UDP)) {
3448 layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3449 }
3450 return (layer4_xor ^
3451 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3452
3453 }
3454
3455 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3456}
3457
3458/*
3459 * Hash for the output device based upon layer 2 data
3460 */
3461static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3462 struct net_device *bond_dev, int count)
3463{
3464 struct ethhdr *data = (struct ethhdr *)skb->data;
3465
3466 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3467}
3468
1da177e4
LT		 3469/*-------------------------- Device entry points ----------------------------*/
3470
3471static int bond_open(struct net_device *bond_dev)
3472{
3473 struct bonding *bond = bond_dev->priv;
3474 struct timer_list *mii_timer = &bond->mii_timer;
3475 struct timer_list *arp_timer = &bond->arp_timer;
3476
3477 bond->kill_timers = 0;
3478
3479 if ((bond->params.mode == BOND_MODE_TLB) ||
3480 (bond->params.mode == BOND_MODE_ALB)) {
3481 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3482
3483 /* bond_alb_initialize must be called before the timer
3484 * is started.
3485 */
3486 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3487 /* something went wrong - fail the open operation */
3488 return -1;
3489 }
3490
3491 init_timer(alb_timer);
3492 alb_timer->expires = jiffies + 1;
3493 alb_timer->data = (unsigned long)bond;
3494 alb_timer->function = (void *)&bond_alb_monitor;
3495 add_timer(alb_timer);
3496 }
3497
3498 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3499 init_timer(mii_timer);
3500 mii_timer->expires = jiffies + 1;
3501 mii_timer->data = (unsigned long)bond_dev;
3502 mii_timer->function = (void *)&bond_mii_monitor;
3503 add_timer(mii_timer);
3504 }
3505
3506 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3507 init_timer(arp_timer);
3508 arp_timer->expires = jiffies + 1;
3509 arp_timer->data = (unsigned long)bond_dev;
3510 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3511 arp_timer->function = (void *)&bond_activebackup_arp_mon;
3512 } else {
3513 arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3514 }
f5b2b966
JV		 3515 if (bond->params.arp_validate)
3516 bond_register_arp(bond);
3517
1da177e4
LT		 3518 add_timer(arp_timer);
3519 }
3520
3521 if (bond->params.mode == BOND_MODE_8023AD) {
3522 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3523 init_timer(ad_timer);
3524 ad_timer->expires = jiffies + 1;
3525 ad_timer->data = (unsigned long)bond;
3526 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3527 add_timer(ad_timer);
3528
3529 /* register to receive LACPDUs */
3530 bond_register_lacpdu(bond);
3531 }
3532
3533 return 0;
3534}
3535
3536static int bond_close(struct net_device *bond_dev)
3537{
3538 struct bonding *bond = bond_dev->priv;
3539
3540 if (bond->params.mode == BOND_MODE_8023AD) {
3541 /* Unregister the receive of LACPDUs */
3542 bond_unregister_lacpdu(bond);
3543 }
3544
f5b2b966
JV		 3545 if (bond->params.arp_validate)
3546 bond_unregister_arp(bond);
3547
1da177e4
LT		 3548 write_lock_bh(&bond->lock);
3549
1da177e4
LT		 3550
3551 /* signal timers not to re-arm */
3552 bond->kill_timers = 1;
3553
3554 write_unlock_bh(&bond->lock);
3555
3556 /* del_timer_sync must run without holding the bond->lock
3557 * because a running timer might be trying to hold it too
3558 */
3559
3560 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3561 del_timer_sync(&bond->mii_timer);
3562 }
3563
3564 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3565 del_timer_sync(&bond->arp_timer);
3566 }
3567
3568 switch (bond->params.mode) {
3569 case BOND_MODE_8023AD:
3570 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3571 break;
3572 case BOND_MODE_TLB:
3573 case BOND_MODE_ALB:
3574 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3575 break;
3576 default:
3577 break;
3578 }
3579
1da177e4
LT		 3580
3581 if ((bond->params.mode == BOND_MODE_TLB) ||
3582 (bond->params.mode == BOND_MODE_ALB)) {
3583 /* Must be called only after all
3584 * slaves have been released
3585 */
3586 bond_alb_deinitialize(bond);
3587 }
3588
3589 return 0;
3590}
3591
3592static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3593{
3594 struct bonding *bond = bond_dev->priv;
3595 struct net_device_stats *stats = &(bond->stats), *sstats;
3596 struct slave *slave;
3597 int i;
3598
3599 memset(stats, 0, sizeof(struct net_device_stats));
3600
3601 read_lock_bh(&bond->lock);
3602
3603 bond_for_each_slave(bond, slave, i) {
c45d286e 3604 sstats = slave->dev->get_stats(slave->dev);
5a1b5898
RR		 3605 stats->rx_packets += sstats->rx_packets;
3606 stats->rx_bytes += sstats->rx_bytes;
3607 stats->rx_errors += sstats->rx_errors;
3608 stats->rx_dropped += sstats->rx_dropped;
3609
3610 stats->tx_packets += sstats->tx_packets;
3611 stats->tx_bytes += sstats->tx_bytes;
3612 stats->tx_errors += sstats->tx_errors;
3613 stats->tx_dropped += sstats->tx_dropped;
3614
3615 stats->multicast += sstats->multicast;
3616 stats->collisions += sstats->collisions;
3617
3618 stats->rx_length_errors += sstats->rx_length_errors;
3619 stats->rx_over_errors += sstats->rx_over_errors;
3620 stats->rx_crc_errors += sstats->rx_crc_errors;
3621 stats->rx_frame_errors += sstats->rx_frame_errors;
3622 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3623 stats->rx_missed_errors += sstats->rx_missed_errors;
3624
3625 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3626 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3627 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3628 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3629 stats->tx_window_errors += sstats->tx_window_errors;
1da177e4
LT		 3630 }
3631
3632 read_unlock_bh(&bond->lock);
3633
3634 return stats;
3635}
3636
3637static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3638{
3639 struct net_device *slave_dev = NULL;
3640 struct ifbond k_binfo;
3641 struct ifbond __user *u_binfo = NULL;
3642 struct ifslave k_sinfo;
3643 struct ifslave __user *u_sinfo = NULL;
3644 struct mii_ioctl_data *mii = NULL;
1da177e4
LT		 3645 int res = 0;
3646
3647 dprintk("bond_ioctl: master=%s, cmd=%d\n",
3648 bond_dev->name, cmd);
3649
3650 switch (cmd) {
1da177e4
LT		 3651 case SIOCGMIIPHY:
3652 mii = if_mii(ifr);
3653 if (!mii) {
3654 return -EINVAL;
3655 }
3656 mii->phy_id = 0;
3657 /* Fall Through */
3658 case SIOCGMIIREG:
3659 /*
3660 * We do this again just in case we were called by SIOCGMIIREG
3661 * instead of SIOCGMIIPHY.
3662 */
3663 mii = if_mii(ifr);
3664 if (!mii) {
3665 return -EINVAL;
3666 }
3667
3668 if (mii->reg_num == 1) {
3669 struct bonding *bond = bond_dev->priv;
3670 mii->val_out = 0;
3671 read_lock_bh(&bond->lock);
3672 read_lock(&bond->curr_slave_lock);
4e140079 3673 if (netif_carrier_ok(bond->dev)) {
1da177e4
LT		 3674 mii->val_out = BMSR_LSTATUS;
3675 }
3676 read_unlock(&bond->curr_slave_lock);
3677 read_unlock_bh(&bond->lock);
3678 }
3679
3680 return 0;
3681 case BOND_INFO_QUERY_OLD:
3682 case SIOCBONDINFOQUERY:
3683 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3684
3685 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3686 return -EFAULT;
3687 }
3688
3689 res = bond_info_query(bond_dev, &k_binfo);
3690 if (res == 0) {
3691 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3692 return -EFAULT;
3693 }
3694 }
3695
3696 return res;
3697 case BOND_SLAVE_INFO_QUERY_OLD:
3698 case SIOCBONDSLAVEINFOQUERY:
3699 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3700
3701 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3702 return -EFAULT;
3703 }
3704
3705 res = bond_slave_info_query(bond_dev, &k_sinfo);
3706 if (res == 0) {
3707 if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3708 return -EFAULT;
3709 }
3710 }
3711
3712 return res;
3713 default:
3714 /* Go on */
3715 break;
3716 }
3717
3718 if (!capable(CAP_NET_ADMIN)) {
3719 return -EPERM;
3720 }
3721
b76cdba9 3722 down_write(&(bonding_rwsem));
1da177e4
LT		 3723 slave_dev = dev_get_by_name(ifr->ifr_slave);
3724
3725 dprintk("slave_dev=%p: \n", slave_dev);
3726
3727 if (!slave_dev) {
3728 res = -ENODEV;
3729 } else {
3730 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3731 switch (cmd) {
3732 case BOND_ENSLAVE_OLD:
3733 case SIOCBONDENSLAVE:
3734 res = bond_enslave(bond_dev, slave_dev);
3735 break;
3736 case BOND_RELEASE_OLD:
3737 case SIOCBONDRELEASE:
3738 res = bond_release(bond_dev, slave_dev);
3739 break;
3740 case BOND_SETHWADDR_OLD:
3741 case SIOCBONDSETHWADDR:
3742 res = bond_sethwaddr(bond_dev, slave_dev);
3743 break;
3744 case BOND_CHANGE_ACTIVE_OLD:
3745 case SIOCBONDCHANGEACTIVE:
3746 res = bond_ioctl_change_active(bond_dev, slave_dev);
3747 break;
3748 default:
3749 res = -EOPNOTSUPP;
3750 }
3751
3752 dev_put(slave_dev);
3753 }
3754
b76cdba9 3755 up_write(&(bonding_rwsem));
1da177e4
LT		 3756 return res;
3757}
3758
3759static void bond_set_multicast_list(struct net_device *bond_dev)
3760{
3761 struct bonding *bond = bond_dev->priv;
3762 struct dev_mc_list *dmi;
3763
3764 write_lock_bh(&bond->lock);
3765
3766 /*
3767 * Do promisc before checking multicast_mode
3768 */
3769 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3770 bond_set_promiscuity(bond, 1);
3771 }
3772
3773 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3774 bond_set_promiscuity(bond, -1);
3775 }
3776
3777 /* set allmulti flag to slaves */
3778 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3779 bond_set_allmulti(bond, 1);
3780 }
3781
3782 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3783 bond_set_allmulti(bond, -1);
3784 }
3785
3786 bond->flags = bond_dev->flags;
3787
3788 /* looking for addresses to add to slaves' mc list */
3789 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3790 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3791 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3792 }
3793 }
3794
3795 /* looking for addresses to delete from slaves' list */
3796 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3797 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3798 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3799 }
3800 }
3801
3802 /* save master's multicast list */
3803 bond_mc_list_destroy(bond);
3804 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3805
3806 write_unlock_bh(&bond->lock);
3807}
3808
3809/*
3810 * Change the MTU of all of a master's slaves to match the master
3811 */
3812static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3813{
3814 struct bonding *bond = bond_dev->priv;
3815 struct slave *slave, *stop_at;
3816 int res = 0;
3817 int i;
3818
3819 dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3820 (bond_dev ? bond_dev->name : "None"), new_mtu);
3821
3822 /* Can't hold bond->lock with bh disabled here since
3823 * some base drivers panic. On the other hand we can't
3824 * hold bond->lock without bh disabled because we'll
3825 * deadlock. The only solution is to rely on the fact
3826 * that we're under rtnl_lock here, and the slaves
3827 * list won't change. This doesn't solve the problem
3828 * of setting the slave's MTU while it is
3829 * transmitting, but the assumption is that the base
3830 * driver can handle that.
3831 *
3832 * TODO: figure out a way to safely iterate the slaves
3833 * list, but without holding a lock around the actual
3834 * call to the base driver.
3835 */
3836
3837 bond_for_each_slave(bond, slave, i) {
3838 dprintk("s %p s->p %p c_m %p\n", slave,
3839 slave->prev, slave->dev->change_mtu);
e944ef79 3840
1da177e4
LT		 3841 res = dev_set_mtu(slave->dev, new_mtu);
3842
3843 if (res) {
3844 /* If we failed to set the slave's mtu to the new value
3845 * we must abort the operation even in ACTIVE_BACKUP
3846 * mode, because if we allow the backup slaves to have
3847 * different mtu values than the active slave we'll
3848 * need to change their mtu when doing a failover. That
3849 * means changing their mtu from timer context, which
3850 * is probably not a good idea.
3851 */
3852 dprintk("err %d %s\n", res, slave->dev->name);
3853 goto unwind;
3854 }
3855 }
3856
3857 bond_dev->mtu = new_mtu;
3858
3859 return 0;
3860
3861unwind:
3862 /* unwind from head to the slave that failed */
3863 stop_at = slave;
3864 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3865 int tmp_res;
3866
3867 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3868 if (tmp_res) {
3869 dprintk("unwind err %d dev %s\n", tmp_res,
3870 slave->dev->name);
3871 }
3872 }
3873
3874 return res;
3875}
3876
3877/*
3878 * Change HW address
3879 *
3880 * Note that many devices must be down to change the HW address, and
3881 * downing the master releases all slaves. We can make bonds full of
3882 * bonding devices to test this, however.
3883 */
3884static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3885{
3886 struct bonding *bond = bond_dev->priv;
3887 struct sockaddr *sa = addr, tmp_sa;
3888 struct slave *slave, *stop_at;
3889 int res = 0;
3890 int i;
3891
3892 dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3893
3894 if (!is_valid_ether_addr(sa->sa_data)) {
3895 return -EADDRNOTAVAIL;
3896 }
3897
3898 /* Can't hold bond->lock with bh disabled here since
3899 * some base drivers panic. On the other hand we can't
3900 * hold bond->lock without bh disabled because we'll
3901 * deadlock. The only solution is to rely on the fact
3902 * that we're under rtnl_lock here, and the slaves
3903 * list won't change. This doesn't solve the problem
3904 * of setting the slave's hw address while it is
3905 * transmitting, but the assumption is that the base
3906 * driver can handle that.
3907 *
3908 * TODO: figure out a way to safely iterate the slaves
3909 * list, but without holding a lock around the actual
3910 * call to the base driver.
3911 */
3912
3913 bond_for_each_slave(bond, slave, i) {
3914 dprintk("slave %p %s\n", slave, slave->dev->name);
3915
3916 if (slave->dev->set_mac_address == NULL) {
3917 res = -EOPNOTSUPP;
3918 dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3919 goto unwind;
3920 }
3921
3922 res = dev_set_mac_address(slave->dev, addr);
3923 if (res) {
3924 /* TODO: consider downing the slave
3925 * and retry ?
3926 * User should expect communications
3927 * breakage anyway until ARP finish
3928 * updating, so...
3929 */
3930 dprintk("err %d %s\n", res, slave->dev->name);
3931 goto unwind;
3932 }
3933 }
3934
3935 /* success */
3936 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3937 return 0;
3938
3939unwind:
3940 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3941 tmp_sa.sa_family = bond_dev->type;
3942
3943 /* unwind from head to the slave that failed */
3944 stop_at = slave;
3945 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3946 int tmp_res;
3947
3948 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3949 if (tmp_res) {
3950 dprintk("unwind err %d dev %s\n", tmp_res,
3951 slave->dev->name);
3952 }
3953 }
3954
3955 return res;
3956}
3957
3958static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3959{
3960 struct bonding *bond = bond_dev->priv;
3961 struct slave *slave, *start_at;
3962 int i;
3963 int res = 1;
3964
3965 read_lock(&bond->lock);
3966
3967 if (!BOND_IS_OK(bond)) {
3968 goto out;
3969 }
3970
3971 read_lock(&bond->curr_slave_lock);
3972 slave = start_at = bond->curr_active_slave;
3973 read_unlock(&bond->curr_slave_lock);
3974
3975 if (!slave) {
3976 goto out;
3977 }
3978
3979 bond_for_each_slave_from(bond, slave, i, start_at) {
3980 if (IS_UP(slave->dev) &&
3981 (slave->link == BOND_LINK_UP) &&
3982 (slave->state == BOND_STATE_ACTIVE)) {
3983 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3984
3985 write_lock(&bond->curr_slave_lock);
3986 bond->curr_active_slave = slave->next;
3987 write_unlock(&bond->curr_slave_lock);
3988
3989 break;
3990 }
3991 }
3992
3993
3994out:
3995 if (res) {
3996 /* no suitable interface, frame not sent */
3997 dev_kfree_skb(skb);
3998 }
3999 read_unlock(&bond->lock);
4000 return 0;
4001}
4002
075897ce 4003
1da177e4
LT		 4004/*
4005 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4006 * the bond has a usable interface.
4007 */
4008static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4009{
4010 struct bonding *bond = bond_dev->priv;
4011 int res = 1;
4012
1da177e4
LT		 4013 read_lock(&bond->lock);
4014 read_lock(&bond->curr_slave_lock);
4015
4016 if (!BOND_IS_OK(bond)) {
4017 goto out;
4018 }
4019
075897ce
JL		 4020 if (!bond->curr_active_slave)
4021 goto out;
4022
075897ce
JL		 4023 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4024
1da177e4
LT		 4025out:
4026 if (res) {
4027 /* no suitable interface, frame not sent */
4028 dev_kfree_skb(skb);
4029 }
4030 read_unlock(&bond->curr_slave_lock);
4031 read_unlock(&bond->lock);
4032 return 0;
4033}
4034
4035/*
169a3e66
JV		 4036 * In bond_xmit_xor() , we determine the output device by using a pre-
4037 * determined xmit_hash_policy(), If the selected device is not enabled,
4038 * find the next active slave.
1da177e4
LT		 4039 */
4040static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4041{
4042 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 4043 struct slave *slave, *start_at;
4044 int slave_no;
4045 int i;
4046 int res = 1;
4047
4048 read_lock(&bond->lock);
4049
4050 if (!BOND_IS_OK(bond)) {
4051 goto out;
4052 }
4053
169a3e66 4054 slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
1da177e4
LT		 4055
4056 bond_for_each_slave(bond, slave, i) {
4057 slave_no--;
4058 if (slave_no < 0) {
4059 break;
4060 }
4061 }
4062
4063 start_at = slave;
4064
4065 bond_for_each_slave_from(bond, slave, i, start_at) {
4066 if (IS_UP(slave->dev) &&
4067 (slave->link == BOND_LINK_UP) &&
4068 (slave->state == BOND_STATE_ACTIVE)) {
4069 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4070 break;
4071 }
4072 }
4073
4074out:
4075 if (res) {
4076 /* no suitable interface, frame not sent */
4077 dev_kfree_skb(skb);
4078 }
4079 read_unlock(&bond->lock);
4080 return 0;
4081}
4082
4083/*
4084 * in broadcast mode, we send everything to all usable interfaces.
4085 */
4086static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4087{
4088 struct bonding *bond = bond_dev->priv;
4089 struct slave *slave, *start_at;
4090 struct net_device *tx_dev = NULL;
4091 int i;
4092 int res = 1;
4093
4094 read_lock(&bond->lock);
4095
4096 if (!BOND_IS_OK(bond)) {
4097 goto out;
4098 }
4099
4100 read_lock(&bond->curr_slave_lock);
4101 start_at = bond->curr_active_slave;
4102 read_unlock(&bond->curr_slave_lock);
4103
4104 if (!start_at) {
4105 goto out;
4106 }
4107
4108 bond_for_each_slave_from(bond, slave, i, start_at) {
4109 if (IS_UP(slave->dev) &&
4110 (slave->link == BOND_LINK_UP) &&
4111 (slave->state == BOND_STATE_ACTIVE)) {
4112 if (tx_dev) {
4113 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4114 if (!skb2) {
4115 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4116 ": %s: Error: bond_xmit_broadcast(): "
4117 "skb_clone() failed\n",
4118 bond_dev->name);
1da177e4
LT		 4119 continue;
4120 }
4121
4122 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4123 if (res) {
4124 dev_kfree_skb(skb2);
4125 continue;
4126 }
4127 }
4128 tx_dev = slave->dev;
4129 }
4130 }
4131
4132 if (tx_dev) {
4133 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4134 }
4135
4136out:
4137 if (res) {
4138 /* no suitable interface, frame not sent */
4139 dev_kfree_skb(skb);
4140 }
4141 /* frame sent to all suitable interfaces */
4142 read_unlock(&bond->lock);
4143 return 0;
4144}
4145
4146/*------------------------- Device initialization ---------------------------*/
4147
4148/*
4149 * set bond mode specific net device operations
4150 */
a77b5325 4151void bond_set_mode_ops(struct bonding *bond, int mode)
1da177e4 4152{
169a3e66
JV		 4153 struct net_device *bond_dev = bond->dev;
4154
1da177e4
LT		 4155 switch (mode) {
4156 case BOND_MODE_ROUNDROBIN:
4157 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4158 break;
4159 case BOND_MODE_ACTIVEBACKUP:
4160 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4161 break;
4162 case BOND_MODE_XOR:
4163 bond_dev->hard_start_xmit = bond_xmit_xor;
169a3e66
JV		 4164 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4165 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4166 else
4167 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4
LT		 4168 break;
4169 case BOND_MODE_BROADCAST:
4170 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4171 break;
4172 case BOND_MODE_8023AD:
8f903c70 4173 bond_set_master_3ad_flags(bond);
1da177e4 4174 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
169a3e66
JV		 4175 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4176 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4177 else
4178 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4 4179 break;
1da177e4 4180 case BOND_MODE_ALB:
8f903c70
JV		 4181 bond_set_master_alb_flags(bond);
4182 /* FALLTHRU */
4183 case BOND_MODE_TLB:
1da177e4
LT		 4184 bond_dev->hard_start_xmit = bond_alb_xmit;
4185 bond_dev->set_mac_address = bond_alb_set_mac_address;
4186 break;
4187 default:
4188 /* Should never happen, mode already checked */
4189 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4190 ": %s: Error: Unknown bonding mode %d\n",
4191 bond_dev->name,
1da177e4
LT		 4192 mode);
4193 break;
4194 }
4195}
4196
217df670
JV		 4197static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4198 struct ethtool_drvinfo *drvinfo)
4199{
4200 strncpy(drvinfo->driver, DRV_NAME, 32);
4201 strncpy(drvinfo->version, DRV_VERSION, 32);
4202 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4203}
4204
7282d491 4205static const struct ethtool_ops bond_ethtool_ops = {
8531c5ff 4206 .get_tx_csum = ethtool_op_get_tx_csum,
a0de3adf
JV		 4207 .get_tso = ethtool_op_get_tso,
4208 .get_ufo = ethtool_op_get_ufo,
8531c5ff 4209 .get_sg = ethtool_op_get_sg,
217df670 4210 .get_drvinfo = bond_ethtool_get_drvinfo,
8531c5ff
AK		 4211};
4212
1da177e4
LT		 4213/*
4214 * Does not allocate but creates a /proc entry.
4215 * Allowed to fail.
4216 */
3c535952 4217static int bond_init(struct net_device *bond_dev, struct bond_params *params)
1da177e4
LT		 4218{
4219 struct bonding *bond = bond_dev->priv;
4220
4221 dprintk("Begin bond_init for %s\n", bond_dev->name);
4222
4223 /* initialize rwlocks */
4224 rwlock_init(&bond->lock);
4225 rwlock_init(&bond->curr_slave_lock);
4226
4227 bond->params = *params; /* copy params struct */
4228
4229 /* Initialize pointers */
4230 bond->first_slave = NULL;
4231 bond->curr_active_slave = NULL;
4232 bond->current_arp_slave = NULL;
4233 bond->primary_slave = NULL;
4234 bond->dev = bond_dev;
4235 INIT_LIST_HEAD(&bond->vlan_list);
4236
4237 /* Initialize the device entry points */
4238 bond_dev->open = bond_open;
4239 bond_dev->stop = bond_close;
4240 bond_dev->get_stats = bond_get_stats;
4241 bond_dev->do_ioctl = bond_do_ioctl;
8531c5ff 4242 bond_dev->ethtool_ops = &bond_ethtool_ops;
1da177e4
LT		 4243 bond_dev->set_multicast_list = bond_set_multicast_list;
4244 bond_dev->change_mtu = bond_change_mtu;
4245 bond_dev->set_mac_address = bond_set_mac_address;
4246
169a3e66 4247 bond_set_mode_ops(bond, bond->params.mode);
1da177e4
LT		 4248
4249 bond_dev->destructor = free_netdev;
4250
4251 /* Initialize the device options */
4252 bond_dev->tx_queue_len = 0;
4253 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
0b680e75 4254 bond_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 4255
4256 /* At first, we block adding VLANs. That's the only way to
4257 * prevent problems that occur when adding VLANs over an
4258 * empty bond. The block will be removed once non-challenged
4259 * slaves are enslaved.
4260 */
4261 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4262
932ff279 4263 /* don't acquire bond device's netif_tx_lock when
1da177e4
LT		 4264 * transmitting */
4265 bond_dev->features |= NETIF_F_LLTX;
4266
4267 /* By default, we declare the bond to be fully
4268 * VLAN hardware accelerated capable. Special
4269 * care is taken in the various xmit functions
4270 * when there are slaves that are not hw accel
4271 * capable
4272 */
4273 bond_dev->vlan_rx_register = bond_vlan_rx_register;
4274 bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid;
4275 bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4276 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4277 NETIF_F_HW_VLAN_RX |
4278 NETIF_F_HW_VLAN_FILTER);
4279
4280#ifdef CONFIG_PROC_FS
4281 bond_create_proc_entry(bond);
4282#endif
4283
4284 list_add_tail(&bond->bond_list, &bond_dev_list);
4285
4286 return 0;
4287}
4288
4289/* De-initialize device specific data.
4290 * Caller must hold rtnl_lock.
4291 */
a77b5325 4292void bond_deinit(struct net_device *bond_dev)
1da177e4
LT		 4293{
4294 struct bonding *bond = bond_dev->priv;
4295
4296 list_del(&bond->bond_list);
4297
4298#ifdef CONFIG_PROC_FS
4299 bond_remove_proc_entry(bond);
4300#endif
4301}
4302
4303/* Unregister and free all bond devices.
4304 * Caller must hold rtnl_lock.
4305 */
4306static void bond_free_all(void)
4307{
4308 struct bonding *bond, *nxt;
4309
4310 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4311 struct net_device *bond_dev = bond->dev;
4312
70298705 4313 bond_mc_list_destroy(bond);
4314 /* Release the bonded slaves */
4315 bond_release_all(bond_dev);
1da177e4 4316 bond_deinit(bond_dev);
3201e656 4317 unregister_netdevice(bond_dev);
1da177e4
LT		 4318 }
4319
4320#ifdef CONFIG_PROC_FS
4321 bond_destroy_proc_dir();
4322#endif
4323}
4324
4325/*------------------------- Module initialization ---------------------------*/
4326
4327/*
4328 * Convert string input module parms. Accept either the
4329 * number of the mode or its string name.
4330 */
a77b5325 4331int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
1da177e4
LT		 4332{
4333 int i;
4334
4335 for (i = 0; tbl[i].modename; i++) {
4336 if ((isdigit(*mode_arg) &&
4337 tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4338 (strncmp(mode_arg, tbl[i].modename,
4339 strlen(tbl[i].modename)) == 0)) {
4340 return tbl[i].mode;
4341 }
4342 }
4343
4344 return -1;
4345}
4346
4347static int bond_check_params(struct bond_params *params)
4348{
f5b2b966
JV		 4349 int arp_validate_value;
4350
1da177e4
LT		 4351 /*
4352 * Convert string parameters.
4353 */
4354 if (mode) {
4355 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4356 if (bond_mode == -1) {
4357 printk(KERN_ERR DRV_NAME
4358 ": Error: Invalid bonding mode \"%s\"\n",
4359 mode == NULL ? "NULL" : mode);
4360 return -EINVAL;
4361 }
4362 }
4363
169a3e66
JV		 4364 if (xmit_hash_policy) {
4365 if ((bond_mode != BOND_MODE_XOR) &&
4366 (bond_mode != BOND_MODE_8023AD)) {
4367 printk(KERN_INFO DRV_NAME
4368 ": xor_mode param is irrelevant in mode %s\n",
4369 bond_mode_name(bond_mode));
4370 } else {
4371 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4372 xmit_hashtype_tbl);
4373 if (xmit_hashtype == -1) {
4374 printk(KERN_ERR DRV_NAME
4375 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4376 xmit_hash_policy == NULL ? "NULL" :
4377 xmit_hash_policy);
4378 return -EINVAL;
4379 }
4380 }
4381 }
4382
1da177e4
LT		 4383 if (lacp_rate) {
4384 if (bond_mode != BOND_MODE_8023AD) {
4385 printk(KERN_INFO DRV_NAME
4386 ": lacp_rate param is irrelevant in mode %s\n",
4387 bond_mode_name(bond_mode));
4388 } else {
4389 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4390 if (lacp_fast == -1) {
4391 printk(KERN_ERR DRV_NAME
4392 ": Error: Invalid lacp rate \"%s\"\n",
4393 lacp_rate == NULL ? "NULL" : lacp_rate);
4394 return -EINVAL;
4395 }
4396 }
4397 }
4398
4399 if (max_bonds < 1 || max_bonds > INT_MAX) {
4400 printk(KERN_WARNING DRV_NAME
4401 ": Warning: max_bonds (%d) not in range %d-%d, so it "
4e0952c7 4402 "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
1da177e4
LT		 4403 max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4404 max_bonds = BOND_DEFAULT_MAX_BONDS;
4405 }
4406
4407 if (miimon < 0) {
4408 printk(KERN_WARNING DRV_NAME
4409 ": Warning: miimon module parameter (%d), "
4410 "not in range 0-%d, so it was reset to %d\n",
4411 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4412 miimon = BOND_LINK_MON_INTERV;
4413 }
4414
4415 if (updelay < 0) {
4416 printk(KERN_WARNING DRV_NAME
4417 ": Warning: updelay module parameter (%d), "
4418 "not in range 0-%d, so it was reset to 0\n",
4419 updelay, INT_MAX);
4420 updelay = 0;
4421 }
4422
4423 if (downdelay < 0) {
4424 printk(KERN_WARNING DRV_NAME
4425 ": Warning: downdelay module parameter (%d), "
4426 "not in range 0-%d, so it was reset to 0\n",
4427 downdelay, INT_MAX);
4428 downdelay = 0;
4429 }
4430
4431 if ((use_carrier != 0) && (use_carrier != 1)) {
4432 printk(KERN_WARNING DRV_NAME
4433 ": Warning: use_carrier module parameter (%d), "
4434 "not of valid value (0/1), so it was set to 1\n",
4435 use_carrier);
4436 use_carrier = 1;
4437 }
4438
4439 /* reset values for 802.3ad */
4440 if (bond_mode == BOND_MODE_8023AD) {
4441 if (!miimon) {
4442 printk(KERN_WARNING DRV_NAME
4443 ": Warning: miimon must be specified, "
4444 "otherwise bonding will not detect link "
4445 "failure, speed and duplex which are "
4446 "essential for 802.3ad operation\n");
4447 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4448 miimon = 100;
4449 }
4450 }
4451
4452 /* reset values for TLB/ALB */
4453 if ((bond_mode == BOND_MODE_TLB) ||
4454 (bond_mode == BOND_MODE_ALB)) {
4455 if (!miimon) {
4456 printk(KERN_WARNING DRV_NAME
4457 ": Warning: miimon must be specified, "
4458 "otherwise bonding will not detect link "
4459 "failure and link speed which are essential "
4460 "for TLB/ALB load balancing\n");
4461 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4462 miimon = 100;
4463 }
4464 }
4465
4466 if (bond_mode == BOND_MODE_ALB) {
4467 printk(KERN_NOTICE DRV_NAME
4468 ": In ALB mode you might experience client "
4469 "disconnections upon reconnection of a link if the "
4470 "bonding module updelay parameter (%d msec) is "
4471 "incompatible with the forwarding delay time of the "
4472 "switch\n",
4473 updelay);
4474 }
4475
4476 if (!miimon) {
4477 if (updelay || downdelay) {
4478 /* just warn the user the up/down delay will have
4479 * no effect since miimon is zero...
4480 */
4481 printk(KERN_WARNING DRV_NAME
4482 ": Warning: miimon module parameter not set "
4483 "and updelay (%d) or downdelay (%d) module "
4484 "parameter is set; updelay and downdelay have "
4485 "no effect unless miimon is set\n",
4486 updelay, downdelay);
4487 }
4488 } else {
4489 /* don't allow arp monitoring */
4490 if (arp_interval) {
4491 printk(KERN_WARNING DRV_NAME
4492 ": Warning: miimon (%d) and arp_interval (%d) "
4493 "can't be used simultaneously, disabling ARP "
4494 "monitoring\n",
4495 miimon, arp_interval);
4496 arp_interval = 0;
4497 }
4498
4499 if ((updelay % miimon) != 0) {
4500 printk(KERN_WARNING DRV_NAME
4501 ": Warning: updelay (%d) is not a multiple "
4502 "of miimon (%d), updelay rounded to %d ms\n",
4503 updelay, miimon, (updelay / miimon) * miimon);
4504 }
4505
4506 updelay /= miimon;
4507
4508 if ((downdelay % miimon) != 0) {
4509 printk(KERN_WARNING DRV_NAME
4510 ": Warning: downdelay (%d) is not a multiple "
4511 "of miimon (%d), downdelay rounded to %d ms\n",
4512 downdelay, miimon,
4513 (downdelay / miimon) * miimon);
4514 }
4515
4516 downdelay /= miimon;
4517 }
4518
4519 if (arp_interval < 0) {
4520 printk(KERN_WARNING DRV_NAME
4521 ": Warning: arp_interval module parameter (%d) "
4522 ", not in range 0-%d, so it was reset to %d\n",
4523 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4524 arp_interval = BOND_LINK_ARP_INTERV;
4525 }
4526
4527 for (arp_ip_count = 0;
4528 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4529 arp_ip_count++) {
4530 /* not complete check, but should be good enough to
4531 catch mistakes */
4532 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4533 printk(KERN_WARNING DRV_NAME
4534 ": Warning: bad arp_ip_target module parameter "
4535 "(%s), ARP monitoring will not be performed\n",
4536 arp_ip_target[arp_ip_count]);
4537 arp_interval = 0;
4538 } else {
4539 u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4540 arp_target[arp_ip_count] = ip;
4541 }
4542 }
4543
4544 if (arp_interval && !arp_ip_count) {
4545 /* don't allow arping if no arp_ip_target given... */
4546 printk(KERN_WARNING DRV_NAME
4547 ": Warning: arp_interval module parameter (%d) "
4548 "specified without providing an arp_ip_target "
4549 "parameter, arp_interval was reset to 0\n",
4550 arp_interval);
4551 arp_interval = 0;
4552 }
4553
f5b2b966
JV		 4554 if (arp_validate) {
4555 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4556 printk(KERN_ERR DRV_NAME
4557 ": arp_validate only supported in active-backup mode\n");
4558 return -EINVAL;
4559 }
4560 if (!arp_interval) {
4561 printk(KERN_ERR DRV_NAME
4562 ": arp_validate requires arp_interval\n");
4563 return -EINVAL;
4564 }
4565
4566 arp_validate_value = bond_parse_parm(arp_validate,
4567 arp_validate_tbl);
4568 if (arp_validate_value == -1) {
4569 printk(KERN_ERR DRV_NAME
4570 ": Error: invalid arp_validate \"%s\"\n",
4571 arp_validate == NULL ? "NULL" : arp_validate);
4572 return -EINVAL;
4573 }
4574 } else
4575 arp_validate_value = 0;
4576
1da177e4
LT		 4577 if (miimon) {
4578 printk(KERN_INFO DRV_NAME
4579 ": MII link monitoring set to %d ms\n",
4580 miimon);
4581 } else if (arp_interval) {
4582 int i;
4583
4584 printk(KERN_INFO DRV_NAME
f5b2b966
JV		 4585 ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4586 arp_interval,
4587 arp_validate_tbl[arp_validate_value].modename,
4588 arp_ip_count);
1da177e4
LT		 4589
4590 for (i = 0; i < arp_ip_count; i++)
4591 printk (" %s", arp_ip_target[i]);
4592
4593 printk("\n");
4594
4595 } else {
4596 /* miimon and arp_interval not set, we need one so things
4597 * work as expected, see bonding.txt for details
4598 */
4599 printk(KERN_WARNING DRV_NAME
4600 ": Warning: either miimon or arp_interval and "
4601 "arp_ip_target module parameters must be specified, "
4602 "otherwise bonding will not detect link failures! see "
4603 "bonding.txt for details.\n");
4604 }
4605
4606 if (primary && !USES_PRIMARY(bond_mode)) {
4607 /* currently, using a primary only makes sense
4608 * in active backup, TLB or ALB modes
4609 */
4610 printk(KERN_WARNING DRV_NAME
4611 ": Warning: %s primary device specified but has no "
4612 "effect in %s mode\n",
4613 primary, bond_mode_name(bond_mode));
4614 primary = NULL;
4615 }
4616
4617 /* fill params struct with the proper values */
4618 params->mode = bond_mode;
169a3e66 4619 params->xmit_policy = xmit_hashtype;
1da177e4
LT		 4620 params->miimon = miimon;
4621 params->arp_interval = arp_interval;
f5b2b966 4622 params->arp_validate = arp_validate_value;
1da177e4
LT		 4623 params->updelay = updelay;
4624 params->downdelay = downdelay;
4625 params->use_carrier = use_carrier;
4626 params->lacp_fast = lacp_fast;
4627 params->primary[0] = 0;
4628
4629 if (primary) {
4630 strncpy(params->primary, primary, IFNAMSIZ);
4631 params->primary[IFNAMSIZ - 1] = 0;
4632 }
4633
4634 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4635
4636 return 0;
4637}
4638
0daa2303
PZ		 4639static struct lock_class_key bonding_netdev_xmit_lock_key;
4640
dfe60397 4641/* Create a new bond based on the specified name and bonding parameters.
e4b91c48 4642 * If name is NULL, obtain a suitable "bond%d" name for us.
dfe60397
MW		 4643 * Caller must NOT hold rtnl_lock; we need to release it here before we
4644 * set up our sysfs entries.
4645 */
4646int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4647{
4648 struct net_device *bond_dev;
4649 int res;
4650
4651 rtnl_lock();
e4b91c48
JV		 4652 bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4653 ether_setup);
dfe60397
MW		 4654 if (!bond_dev) {
4655 printk(KERN_ERR DRV_NAME
4656 ": %s: eek! can't alloc netdev!\n",
4657 name);
4658 res = -ENOMEM;
4659 goto out_rtnl;
4660 }
4661
e4b91c48
JV		 4662 if (!name) {
4663 res = dev_alloc_name(bond_dev, "bond%d");
4664 if (res < 0)
4665 goto out_netdev;
4666 }
4667
dfe60397
MW		 4668 /* bond_init() must be called after dev_alloc_name() (for the
4669 * /proc files), but before register_netdevice(), because we
4670 * need to set function pointers.
4671 */
4672
4673 res = bond_init(bond_dev, params);
4674 if (res < 0) {
4675 goto out_netdev;
4676 }
4677
4678 SET_MODULE_OWNER(bond_dev);
4679
4680 res = register_netdevice(bond_dev);
4681 if (res < 0) {
4682 goto out_bond;
4683 }
0daa2303
PZ		 4684
4685 lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4686
dfe60397
MW		 4687 if (newbond)
4688 *newbond = bond_dev->priv;
4689
ff59c456
JV		 4690 netif_carrier_off(bond_dev);
4691
dfe60397 4692 rtnl_unlock(); /* allows sysfs registration of net device */
b76cdba9 4693 res = bond_create_sysfs_entry(bond_dev->priv);
09c89279
JV		 4694 if (res < 0) {
4695 rtnl_lock();
4696 goto out_bond;
4697 }
4698
4699 return 0;
4700
dfe60397
MW		 4701out_bond:
4702 bond_deinit(bond_dev);
4703out_netdev:
4704 free_netdev(bond_dev);
4705out_rtnl:
4706 rtnl_unlock();
dfe60397
MW		 4707 return res;
4708}
4709
1da177e4
LT		 4710static int __init bonding_init(void)
4711{
1da177e4
LT		 4712 int i;
4713 int res;
4714
4715 printk(KERN_INFO "%s", version);
4716
dfe60397 4717 res = bond_check_params(&bonding_defaults);
1da177e4 4718 if (res) {
dfe60397 4719 goto out;
1da177e4
LT		 4720 }
4721
1da177e4
LT		 4722#ifdef CONFIG_PROC_FS
4723 bond_create_proc_dir();
4724#endif
1da177e4 4725 for (i = 0; i < max_bonds; i++) {
e4b91c48 4726 res = bond_create(NULL, &bonding_defaults, NULL);
dfe60397
MW		 4727 if (res)
4728 goto err;
1da177e4
LT		 4729 }
4730
b76cdba9
MW		 4731 res = bond_create_sysfs();
4732 if (res)
4733 goto err;
4734
1da177e4 4735 register_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4736 register_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4 4737
dfe60397
MW		 4738 goto out;
4739err:
40abc270 4740 rtnl_lock();
1da177e4 4741 bond_free_all();
b76cdba9 4742 bond_destroy_sysfs();
1da177e4 4743 rtnl_unlock();
dfe60397 4744out:
1da177e4 4745 return res;
dfe60397 4746
1da177e4
LT		 4747}
4748
4749static void __exit bonding_exit(void)
4750{
4751 unregister_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4752 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4
LT		 4753
4754 rtnl_lock();
4755 bond_free_all();
b76cdba9 4756 bond_destroy_sysfs();
1da177e4
LT		 4757 rtnl_unlock();
4758}
4759
4760module_init(bonding_init);
4761module_exit(bonding_exit);
4762MODULE_LICENSE("GPL");
4763MODULE_VERSION(DRV_VERSION);
4764MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4765MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4766MODULE_SUPPORTED_DEVICE("most ethernet devices");
4767
4768/*
4769 * Local variables:
4770 * c-indent-level: 8
4771 * c-basic-offset: 8
4772 * tab-width: 8
4773 * End:
4774 */
4775
Clone of davem's net-next-2.6 tree