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[net-next-2.6.git] / drivers / net / bonding / bond_main.c
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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>
457c4cbc 78#include <net/net_namespace.h>
1da177e4
LT		 79#include "bonding.h"
80#include "bond_3ad.h"
81#include "bond_alb.h"
82
83/*---------------------------- Module parameters ----------------------------*/
84
85/* monitor all links that often (in milliseconds). <=0 disables monitoring */
86#define BOND_LINK_MON_INTERV 0
87#define BOND_LINK_ARP_INTERV 0
88
89static int max_bonds = BOND_DEFAULT_MAX_BONDS;
90static int miimon = BOND_LINK_MON_INTERV;
91static int updelay = 0;
92static int downdelay = 0;
93static int use_carrier = 1;
94static char *mode = NULL;
95static char *primary = NULL;
96static char *lacp_rate = NULL;
169a3e66 97static char *xmit_hash_policy = NULL;
1da177e4
LT		 98static int arp_interval = BOND_LINK_ARP_INTERV;
99static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
f5b2b966 100static char *arp_validate = NULL;
12479f9a 101struct bond_params bonding_defaults;
1da177e4
LT		 102
103module_param(max_bonds, int, 0);
104MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
105module_param(miimon, int, 0);
106MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
107module_param(updelay, int, 0);
108MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
109module_param(downdelay, int, 0);
2ac47660
MW		 110MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
111 "in milliseconds");
1da177e4 112module_param(use_carrier, int, 0);
2ac47660
MW		 113MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
114 "0 for off, 1 for on (default)");
1da177e4 115module_param(mode, charp, 0);
2ac47660
MW		 116MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
117 "1 for active-backup, 2 for balance-xor, "
118 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
119 "6 for balance-alb");
1da177e4
LT		 120module_param(primary, charp, 0);
121MODULE_PARM_DESC(primary, "Primary network device to use");
122module_param(lacp_rate, charp, 0);
2ac47660
MW		 123MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
124 "(slow/fast)");
169a3e66 125module_param(xmit_hash_policy, charp, 0);
2ac47660
MW		 126MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
127 ", 1 for layer 3+4");
1da177e4
LT		 128module_param(arp_interval, int, 0);
129MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
130module_param_array(arp_ip_target, charp, NULL, 0);
131MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
f5b2b966
JV		 132module_param(arp_validate, charp, 0);
133MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
1da177e4
LT		 134
135/*----------------------------- Global variables ----------------------------*/
136
f71e1309 137static const char * const version =
1da177e4
LT		 138 DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
139
12479f9a 140LIST_HEAD(bond_dev_list);
1da177e4
LT		 141
142#ifdef CONFIG_PROC_FS
143static struct proc_dir_entry *bond_proc_dir = NULL;
144#endif
145
b76cdba9 146extern struct rw_semaphore bonding_rwsem;
1da177e4
LT		 147static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
148static int arp_ip_count = 0;
1da177e4 149static int bond_mode = BOND_MODE_ROUNDROBIN;
169a3e66 150static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
1da177e4 151static int lacp_fast = 0;
217df670 152
1da177e4 153
12479f9a 154struct bond_parm_tbl bond_lacp_tbl[] = {
1da177e4
LT		 155{ "slow", AD_LACP_SLOW},
156{ "fast", AD_LACP_FAST},
157{ NULL, -1},
158};
159
12479f9a 160struct bond_parm_tbl bond_mode_tbl[] = {
1da177e4
LT		 161{ "balance-rr", BOND_MODE_ROUNDROBIN},
162{ "active-backup", BOND_MODE_ACTIVEBACKUP},
163{ "balance-xor", BOND_MODE_XOR},
164{ "broadcast", BOND_MODE_BROADCAST},
165{ "802.3ad", BOND_MODE_8023AD},
166{ "balance-tlb", BOND_MODE_TLB},
167{ "balance-alb", BOND_MODE_ALB},
168{ NULL, -1},
169};
170
12479f9a 171struct bond_parm_tbl xmit_hashtype_tbl[] = {
169a3e66
JV		 172{ "layer2", BOND_XMIT_POLICY_LAYER2},
173{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
174{ NULL, -1},
175};
176
f5b2b966
JV		 177struct bond_parm_tbl arp_validate_tbl[] = {
178{ "none", BOND_ARP_VALIDATE_NONE},
179{ "active", BOND_ARP_VALIDATE_ACTIVE},
180{ "backup", BOND_ARP_VALIDATE_BACKUP},
181{ "all", BOND_ARP_VALIDATE_ALL},
182{ NULL, -1},
183};
184
1da177e4
LT		 185/*-------------------------- Forward declarations ---------------------------*/
186
c3ade5ca 187static void bond_send_gratuitous_arp(struct bonding *bond);
1da177e4
LT		 188
189/*---------------------------- General routines -----------------------------*/
190
4ad072c9 191static const char *bond_mode_name(int mode)
1da177e4
LT		 192{
193 switch (mode) {
194 case BOND_MODE_ROUNDROBIN :
195 return "load balancing (round-robin)";
196 case BOND_MODE_ACTIVEBACKUP :
197 return "fault-tolerance (active-backup)";
198 case BOND_MODE_XOR :
199 return "load balancing (xor)";
200 case BOND_MODE_BROADCAST :
201 return "fault-tolerance (broadcast)";
202 case BOND_MODE_8023AD:
203 return "IEEE 802.3ad Dynamic link aggregation";
204 case BOND_MODE_TLB:
205 return "transmit load balancing";
206 case BOND_MODE_ALB:
207 return "adaptive load balancing";
208 default:
209 return "unknown";
210 }
211}
212
213/*---------------------------------- VLAN -----------------------------------*/
214
215/**
216 * bond_add_vlan - add a new vlan id on bond
217 * @bond: bond that got the notification
218 * @vlan_id: the vlan id to add
219 *
220 * Returns -ENOMEM if allocation failed.
221 */
222static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
223{
224 struct vlan_entry *vlan;
225
226 dprintk("bond: %s, vlan id %d\n",
227 (bond ? bond->dev->name: "None"), vlan_id);
228
229 vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
230 if (!vlan) {
231 return -ENOMEM;
232 }
233
234 INIT_LIST_HEAD(&vlan->vlan_list);
235 vlan->vlan_id = vlan_id;
c3ade5ca 236 vlan->vlan_ip = 0;
1da177e4
LT		 237
238 write_lock_bh(&bond->lock);
239
240 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
241
242 write_unlock_bh(&bond->lock);
243
244 dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
245
246 return 0;
247}
248
249/**
250 * bond_del_vlan - delete a vlan id from bond
251 * @bond: bond that got the notification
252 * @vlan_id: the vlan id to delete
253 *
254 * returns -ENODEV if @vlan_id was not found in @bond.
255 */
256static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
257{
258 struct vlan_entry *vlan, *next;
259 int res = -ENODEV;
260
261 dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
262
263 write_lock_bh(&bond->lock);
264
265 list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
266 if (vlan->vlan_id == vlan_id) {
267 list_del(&vlan->vlan_list);
268
269 if ((bond->params.mode == BOND_MODE_TLB) ||
270 (bond->params.mode == BOND_MODE_ALB)) {
271 bond_alb_clear_vlan(bond, vlan_id);
272 }
273
274 dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
275 bond->dev->name);
276
277 kfree(vlan);
278
279 if (list_empty(&bond->vlan_list) &&
280 (bond->slave_cnt == 0)) {
281 /* Last VLAN removed and no slaves, so
282 * restore block on adding VLANs. This will
283 * be removed once new slaves that are not
284 * VLAN challenged will be added.
285 */
286 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
287 }
288
289 res = 0;
290 goto out;
291 }
292 }
293
294 dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
295 bond->dev->name);
296
297out:
298 write_unlock_bh(&bond->lock);
299 return res;
300}
301
302/**
303 * bond_has_challenged_slaves
304 * @bond: the bond we're working on
305 *
306 * Searches the slave list. Returns 1 if a vlan challenged slave
307 * was found, 0 otherwise.
308 *
309 * Assumes bond->lock is held.
310 */
311static int bond_has_challenged_slaves(struct bonding *bond)
312{
313 struct slave *slave;
314 int i;
315
316 bond_for_each_slave(bond, slave, i) {
317 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
318 dprintk("found VLAN challenged slave - %s\n",
319 slave->dev->name);
320 return 1;
321 }
322 }
323
324 dprintk("no VLAN challenged slaves found\n");
325 return 0;
326}
327
328/**
329 * bond_next_vlan - safely skip to the next item in the vlans list.
330 * @bond: the bond we're working on
331 * @curr: item we're advancing from
332 *
333 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
334 * or @curr->next otherwise (even if it is @curr itself again).
335 *
336 * Caller must hold bond->lock
337 */
338struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
339{
340 struct vlan_entry *next, *last;
341
342 if (list_empty(&bond->vlan_list)) {
343 return NULL;
344 }
345
346 if (!curr) {
347 next = list_entry(bond->vlan_list.next,
348 struct vlan_entry, vlan_list);
349 } else {
350 last = list_entry(bond->vlan_list.prev,
351 struct vlan_entry, vlan_list);
352 if (last == curr) {
353 next = list_entry(bond->vlan_list.next,
354 struct vlan_entry, vlan_list);
355 } else {
356 next = list_entry(curr->vlan_list.next,
357 struct vlan_entry, vlan_list);
358 }
359 }
360
361 return next;
362}
363
364/**
365 * bond_dev_queue_xmit - Prepare skb for xmit.
366 *
367 * @bond: bond device that got this skb for tx.
368 * @skb: hw accel VLAN tagged skb to transmit
369 * @slave_dev: slave that is supposed to xmit this skbuff
370 *
371 * When the bond gets an skb to transmit that is
372 * already hardware accelerated VLAN tagged, and it
373 * needs to relay this skb to a slave that is not
374 * hw accel capable, the skb needs to be "unaccelerated",
375 * i.e. strip the hwaccel tag and re-insert it as part
376 * of the payload.
377 */
378int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
379{
380 unsigned short vlan_id;
381
382 if (!list_empty(&bond->vlan_list) &&
383 !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
384 vlan_get_tag(skb, &vlan_id) == 0) {
385 skb->dev = slave_dev;
386 skb = vlan_put_tag(skb, vlan_id);
387 if (!skb) {
388 /* vlan_put_tag() frees the skb in case of error,
389 * so return success here so the calling functions
390 * won't attempt to free is again.
391 */
392 return 0;
393 }
394 } else {
395 skb->dev = slave_dev;
396 }
397
398 skb->priority = 1;
399 dev_queue_xmit(skb);
400
401 return 0;
402}
403
404/*
405 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
406 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
407 * lock because:
408 * a. This operation is performed in IOCTL context,
409 * b. The operation is protected by the RTNL semaphore in the 8021q code,
410 * c. Holding a lock with BH disabled while directly calling a base driver
411 * entry point is generally a BAD idea.
412 *
413 * The design of synchronization/protection for this operation in the 8021q
414 * module is good for one or more VLAN devices over a single physical device
415 * and cannot be extended for a teaming solution like bonding, so there is a
416 * potential race condition here where a net device from the vlan group might
417 * be referenced (either by a base driver or the 8021q code) while it is being
418 * removed from the system. However, it turns out we're not making matters
419 * worse, and if it works for regular VLAN usage it will work here too.
420*/
421
422/**
423 * bond_vlan_rx_register - Propagates registration to slaves
424 * @bond_dev: bonding net device that got called
425 * @grp: vlan group being registered
426 */
427static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
428{
429 struct bonding *bond = bond_dev->priv;
430 struct slave *slave;
431 int i;
432
433 bond->vlgrp = grp;
434
435 bond_for_each_slave(bond, slave, i) {
436 struct net_device *slave_dev = slave->dev;
437
438 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
439 slave_dev->vlan_rx_register) {
440 slave_dev->vlan_rx_register(slave_dev, grp);
441 }
442 }
443}
444
445/**
446 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
447 * @bond_dev: bonding net device that got called
448 * @vid: vlan id being added
449 */
450static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
451{
452 struct bonding *bond = bond_dev->priv;
453 struct slave *slave;
454 int i, res;
455
456 bond_for_each_slave(bond, slave, i) {
457 struct net_device *slave_dev = slave->dev;
458
459 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
460 slave_dev->vlan_rx_add_vid) {
461 slave_dev->vlan_rx_add_vid(slave_dev, vid);
462 }
463 }
464
465 res = bond_add_vlan(bond, vid);
466 if (res) {
467 printk(KERN_ERR DRV_NAME
4e0952c7 468 ": %s: Error: Failed to add vlan id %d\n",
1da177e4
LT		 469 bond_dev->name, vid);
470 }
471}
472
473/**
474 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
475 * @bond_dev: bonding net device that got called
476 * @vid: vlan id being removed
477 */
478static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
479{
480 struct bonding *bond = bond_dev->priv;
481 struct slave *slave;
482 struct net_device *vlan_dev;
483 int i, res;
484
485 bond_for_each_slave(bond, slave, i) {
486 struct net_device *slave_dev = slave->dev;
487
488 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
489 slave_dev->vlan_rx_kill_vid) {
490 /* Save and then restore vlan_dev in the grp array,
491 * since the slave's driver might clear it.
492 */
5c15bdec 493 vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
1da177e4 494 slave_dev->vlan_rx_kill_vid(slave_dev, vid);
5c15bdec 495 vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
1da177e4
LT		 496 }
497 }
498
499 res = bond_del_vlan(bond, vid);
500 if (res) {
501 printk(KERN_ERR DRV_NAME
4e0952c7 502 ": %s: Error: Failed to remove vlan id %d\n",
1da177e4
LT		 503 bond_dev->name, vid);
504 }
505}
506
507static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
508{
509 struct vlan_entry *vlan;
510
511 write_lock_bh(&bond->lock);
512
513 if (list_empty(&bond->vlan_list)) {
514 goto out;
515 }
516
517 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
518 slave_dev->vlan_rx_register) {
519 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
520 }
521
522 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
523 !(slave_dev->vlan_rx_add_vid)) {
524 goto out;
525 }
526
527 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
528 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
529 }
530
531out:
532 write_unlock_bh(&bond->lock);
533}
534
535static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
536{
537 struct vlan_entry *vlan;
538 struct net_device *vlan_dev;
539
540 write_lock_bh(&bond->lock);
541
542 if (list_empty(&bond->vlan_list)) {
543 goto out;
544 }
545
546 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
547 !(slave_dev->vlan_rx_kill_vid)) {
548 goto unreg;
549 }
550
551 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
552 /* Save and then restore vlan_dev in the grp array,
553 * since the slave's driver might clear it.
554 */
5c15bdec 555 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
1da177e4 556 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
5c15bdec 557 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
1da177e4
LT		 558 }
559
560unreg:
561 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
562 slave_dev->vlan_rx_register) {
563 slave_dev->vlan_rx_register(slave_dev, NULL);
564 }
565
566out:
567 write_unlock_bh(&bond->lock);
568}
569
570/*------------------------------- Link status -------------------------------*/
571
ff59c456
JV		 572/*
573 * Set the carrier state for the master according to the state of its
574 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
575 * do special 802.3ad magic.
576 *
577 * Returns zero if carrier state does not change, nonzero if it does.
578 */
579static int bond_set_carrier(struct bonding *bond)
580{
581 struct slave *slave;
582 int i;
583
584 if (bond->slave_cnt == 0)
585 goto down;
586
587 if (bond->params.mode == BOND_MODE_8023AD)
588 return bond_3ad_set_carrier(bond);
589
590 bond_for_each_slave(bond, slave, i) {
591 if (slave->link == BOND_LINK_UP) {
592 if (!netif_carrier_ok(bond->dev)) {
593 netif_carrier_on(bond->dev);
594 return 1;
595 }
596 return 0;
597 }
598 }
599
600down:
601 if (netif_carrier_ok(bond->dev)) {
602 netif_carrier_off(bond->dev);
603 return 1;
604 }
605 return 0;
606}
607
1da177e4
LT		 608/*
609 * Get link speed and duplex from the slave's base driver
610 * using ethtool. If for some reason the call fails or the
611 * values are invalid, fake speed and duplex to 100/Full
612 * and return error.
613 */
614static int bond_update_speed_duplex(struct slave *slave)
615{
616 struct net_device *slave_dev = slave->dev;
1da177e4 617 struct ethtool_cmd etool;
61a44b9c 618 int res;
1da177e4
LT		 619
620 /* Fake speed and duplex */
621 slave->speed = SPEED_100;
622 slave->duplex = DUPLEX_FULL;
623
61a44b9c
MW		 624 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
625 return -1;
1da177e4 626
61a44b9c
MW		 627 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
628 if (res < 0)
1da177e4 629 return -1;
1da177e4 630
1da177e4
LT		 631 switch (etool.speed) {
632 case SPEED_10:
633 case SPEED_100:
634 case SPEED_1000:
94dbffd5 635 case SPEED_10000:
1da177e4
LT		 636 break;
637 default:
638 return -1;
639 }
640
641 switch (etool.duplex) {
642 case DUPLEX_FULL:
643 case DUPLEX_HALF:
644 break;
645 default:
646 return -1;
647 }
648
649 slave->speed = etool.speed;
650 slave->duplex = etool.duplex;
651
652 return 0;
653}
654
655/*
656 * if <dev> supports MII link status reporting, check its link status.
657 *
658 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
659 * depening upon the setting of the use_carrier parameter.
660 *
661 * Return either BMSR_LSTATUS, meaning that the link is up (or we
662 * can't tell and just pretend it is), or 0, meaning that the link is
663 * down.
664 *
665 * If reporting is non-zero, instead of faking link up, return -1 if
666 * both ETHTOOL and MII ioctls fail (meaning the device does not
667 * support them). If use_carrier is set, return whatever it says.
668 * It'd be nice if there was a good way to tell if a driver supports
669 * netif_carrier, but there really isn't.
670 */
671static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
672{
673 static int (* ioctl)(struct net_device *, struct ifreq *, int);
674 struct ifreq ifr;
675 struct mii_ioctl_data *mii;
1da177e4
LT		 676
677 if (bond->params.use_carrier) {
678 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
679 }
680
681 ioctl = slave_dev->do_ioctl;
682 if (ioctl) {
683 /* TODO: set pointer to correct ioctl on a per team member */
684 /* bases to make this more efficient. that is, once */
685 /* we determine the correct ioctl, we will always */
686 /* call it and not the others for that team */
687 /* member. */
688
689 /*
690 * We cannot assume that SIOCGMIIPHY will also read a
691 * register; not all network drivers (e.g., e100)
692 * support that.
693 */
694
695 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
696 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
697 mii = if_mii(&ifr);
698 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
699 mii->reg_num = MII_BMSR;
700 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
701 return (mii->val_out & BMSR_LSTATUS);
702 }
703 }
704 }
705
61a44b9c
MW		 706 /*
707 * Some drivers cache ETHTOOL_GLINK for a period of time so we only
708 * attempt to get link status from it if the above MII ioctls fail.
709 */
1da177e4
LT		 710 if (slave_dev->ethtool_ops) {
711 if (slave_dev->ethtool_ops->get_link) {
712 u32 link;
713
714 link = slave_dev->ethtool_ops->get_link(slave_dev);
715
716 return link ? BMSR_LSTATUS : 0;
717 }
718 }
719
1da177e4
LT		 720 /*
721 * If reporting, report that either there's no dev->do_ioctl,
61a44b9c 722 * or both SIOCGMIIREG and get_link failed (meaning that we
1da177e4
LT		 723 * cannot report link status). If not reporting, pretend
724 * we're ok.
725 */
726 return (reporting ? -1 : BMSR_LSTATUS);
727}
728
729/*----------------------------- Multicast list ------------------------------*/
730
731/*
732 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
733 */
734static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
735{
736 return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
737 dmi1->dmi_addrlen == dmi2->dmi_addrlen;
738}
739
740/*
741 * returns dmi entry if found, NULL otherwise
742 */
743static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
744{
745 struct dev_mc_list *idmi;
746
747 for (idmi = mc_list; idmi; idmi = idmi->next) {
748 if (bond_is_dmi_same(dmi, idmi)) {
749 return idmi;
750 }
751 }
752
753 return NULL;
754}
755
756/*
757 * Push the promiscuity flag down to appropriate slaves
758 */
759static void bond_set_promiscuity(struct bonding *bond, int inc)
760{
761 if (USES_PRIMARY(bond->params.mode)) {
762 /* write lock already acquired */
763 if (bond->curr_active_slave) {
764 dev_set_promiscuity(bond->curr_active_slave->dev, inc);
765 }
766 } else {
767 struct slave *slave;
768 int i;
769 bond_for_each_slave(bond, slave, i) {
770 dev_set_promiscuity(slave->dev, inc);
771 }
772 }
773}
774
775/*
776 * Push the allmulti flag down to all slaves
777 */
778static void bond_set_allmulti(struct bonding *bond, int inc)
779{
780 if (USES_PRIMARY(bond->params.mode)) {
781 /* write lock already acquired */
782 if (bond->curr_active_slave) {
783 dev_set_allmulti(bond->curr_active_slave->dev, inc);
784 }
785 } else {
786 struct slave *slave;
787 int i;
788 bond_for_each_slave(bond, slave, i) {
789 dev_set_allmulti(slave->dev, inc);
790 }
791 }
792}
793
794/*
795 * Add a Multicast address to slaves
796 * according to mode
797 */
798static void bond_mc_add(struct bonding *bond, void *addr, int alen)
799{
800 if (USES_PRIMARY(bond->params.mode)) {
801 /* write lock already acquired */
802 if (bond->curr_active_slave) {
803 dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
804 }
805 } else {
806 struct slave *slave;
807 int i;
808 bond_for_each_slave(bond, slave, i) {
809 dev_mc_add(slave->dev, addr, alen, 0);
810 }
811 }
812}
813
814/*
815 * Remove a multicast address from slave
816 * according to mode
817 */
818static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
819{
820 if (USES_PRIMARY(bond->params.mode)) {
821 /* write lock already acquired */
822 if (bond->curr_active_slave) {
823 dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
824 }
825 } else {
826 struct slave *slave;
827 int i;
828 bond_for_each_slave(bond, slave, i) {
829 dev_mc_delete(slave->dev, addr, alen, 0);
830 }
831 }
832}
833
a816c7c7
JV		 834
835/*
836 * Retrieve the list of registered multicast addresses for the bonding
837 * device and retransmit an IGMP JOIN request to the current active
838 * slave.
839 */
840static void bond_resend_igmp_join_requests(struct bonding *bond)
841{
842 struct in_device *in_dev;
843 struct ip_mc_list *im;
844
845 rcu_read_lock();
846 in_dev = __in_dev_get_rcu(bond->dev);
847 if (in_dev) {
848 for (im = in_dev->mc_list; im; im = im->next) {
849 ip_mc_rejoin_group(im);
850 }
851 }
852
853 rcu_read_unlock();
854}
855
1da177e4
LT		 856/*
857 * Totally destroys the mc_list in bond
858 */
859static void bond_mc_list_destroy(struct bonding *bond)
860{
861 struct dev_mc_list *dmi;
862
863 dmi = bond->mc_list;
864 while (dmi) {
865 bond->mc_list = dmi->next;
866 kfree(dmi);
867 dmi = bond->mc_list;
868 }
a816c7c7 869 bond->mc_list = NULL;
1da177e4
LT		 870}
871
872/*
873 * Copy all the Multicast addresses from src to the bonding device dst
874 */
de54f390 875static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
dd0fc66f 876 gfp_t gfp_flag)
1da177e4
LT		 877{
878 struct dev_mc_list *dmi, *new_dmi;
879
880 for (dmi = mc_list; dmi; dmi = dmi->next) {
de54f390 881 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
1da177e4
LT		 882
883 if (!new_dmi) {
884 /* FIXME: Potential memory leak !!! */
885 return -ENOMEM;
886 }
887
888 new_dmi->next = bond->mc_list;
889 bond->mc_list = new_dmi;
890 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
891 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
892 new_dmi->dmi_users = dmi->dmi_users;
893 new_dmi->dmi_gusers = dmi->dmi_gusers;
894 }
895
896 return 0;
897}
898
899/*
900 * flush all members of flush->mc_list from device dev->mc_list
901 */
902static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
903{
904 struct bonding *bond = bond_dev->priv;
905 struct dev_mc_list *dmi;
906
907 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
908 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
909 }
910
911 if (bond->params.mode == BOND_MODE_8023AD) {
912 /* del lacpdu mc addr from mc list */
913 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
914
915 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
916 }
917}
918
919/*--------------------------- Active slave change ---------------------------*/
920
921/*
922 * Update the mc list and multicast-related flags for the new and
923 * old active slaves (if any) according to the multicast mode, and
924 * promiscuous flags unconditionally.
925 */
926static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
927{
928 struct dev_mc_list *dmi;
929
930 if (!USES_PRIMARY(bond->params.mode)) {
931 /* nothing to do - mc list is already up-to-date on
932 * all slaves
933 */
934 return;
935 }
936
937 if (old_active) {
938 if (bond->dev->flags & IFF_PROMISC) {
939 dev_set_promiscuity(old_active->dev, -1);
940 }
941
942 if (bond->dev->flags & IFF_ALLMULTI) {
943 dev_set_allmulti(old_active->dev, -1);
944 }
945
946 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
947 dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
948 }
949 }
950
951 if (new_active) {
952 if (bond->dev->flags & IFF_PROMISC) {
953 dev_set_promiscuity(new_active->dev, 1);
954 }
955
956 if (bond->dev->flags & IFF_ALLMULTI) {
957 dev_set_allmulti(new_active->dev, 1);
958 }
959
960 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
961 dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
962 }
a816c7c7 963 bond_resend_igmp_join_requests(bond);
1da177e4
LT		 964 }
965}
966
967/**
968 * find_best_interface - select the best available slave to be the active one
969 * @bond: our bonding struct
970 *
971 * Warning: Caller must hold curr_slave_lock for writing.
972 */
973static struct slave *bond_find_best_slave(struct bonding *bond)
974{
975 struct slave *new_active, *old_active;
976 struct slave *bestslave = NULL;
977 int mintime = bond->params.updelay;
978 int i;
979
980 new_active = old_active = bond->curr_active_slave;
981
982 if (!new_active) { /* there were no active slaves left */
983 if (bond->slave_cnt > 0) { /* found one slave */
984 new_active = bond->first_slave;
985 } else {
986 return NULL; /* still no slave, return NULL */
987 }
988 }
989
990 /* first try the primary link; if arping, a link must tx/rx traffic
991 * before it can be considered the curr_active_slave - also, we would skip
992 * slaves between the curr_active_slave and primary_slave that may be up
993 * and able to arp
994 */
995 if ((bond->primary_slave) &&
996 (!bond->params.arp_interval) &&
997 (IS_UP(bond->primary_slave->dev))) {
998 new_active = bond->primary_slave;
999 }
1000
1001 /* remember where to stop iterating over the slaves */
1002 old_active = new_active;
1003
1004 bond_for_each_slave_from(bond, new_active, i, old_active) {
1005 if (IS_UP(new_active->dev)) {
1006 if (new_active->link == BOND_LINK_UP) {
1007 return new_active;
1008 } else if (new_active->link == BOND_LINK_BACK) {
1009 /* link up, but waiting for stabilization */
1010 if (new_active->delay < mintime) {
1011 mintime = new_active->delay;
1012 bestslave = new_active;
1013 }
1014 }
1015 }
1016 }
1017
1018 return bestslave;
1019}
1020
1021/**
1022 * change_active_interface - change the active slave into the specified one
1023 * @bond: our bonding struct
1024 * @new: the new slave to make the active one
1025 *
1026 * Set the new slave to the bond's settings and unset them on the old
1027 * curr_active_slave.
1028 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1029 *
1030 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1031 * because it is apparently the best available slave we have, even though its
1032 * updelay hasn't timed out yet.
1033 *
1034 * Warning: Caller must hold curr_slave_lock for writing.
1035 */
a77b5325 1036void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1da177e4
LT		 1037{
1038 struct slave *old_active = bond->curr_active_slave;
1039
1040 if (old_active == new_active) {
1041 return;
1042 }
1043
1044 if (new_active) {
1045 if (new_active->link == BOND_LINK_BACK) {
1046 if (USES_PRIMARY(bond->params.mode)) {
1047 printk(KERN_INFO DRV_NAME
1048 ": %s: making interface %s the new "
1049 "active one %d ms earlier.\n",
1050 bond->dev->name, new_active->dev->name,
1051 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1052 }
1053
1054 new_active->delay = 0;
1055 new_active->link = BOND_LINK_UP;
1056 new_active->jiffies = jiffies;
1057
1058 if (bond->params.mode == BOND_MODE_8023AD) {
1059 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1060 }
1061
1062 if ((bond->params.mode == BOND_MODE_TLB) ||
1063 (bond->params.mode == BOND_MODE_ALB)) {
1064 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1065 }
1066 } else {
1067 if (USES_PRIMARY(bond->params.mode)) {
1068 printk(KERN_INFO DRV_NAME
1069 ": %s: making interface %s the new "
1070 "active one.\n",
1071 bond->dev->name, new_active->dev->name);
1072 }
1073 }
1074 }
1075
1da177e4
LT		 1076 if (USES_PRIMARY(bond->params.mode)) {
1077 bond_mc_swap(bond, new_active, old_active);
1078 }
1079
1080 if ((bond->params.mode == BOND_MODE_TLB) ||
1081 (bond->params.mode == BOND_MODE_ALB)) {
1082 bond_alb_handle_active_change(bond, new_active);
8f903c70
JV		 1083 if (old_active)
1084 bond_set_slave_inactive_flags(old_active);
1085 if (new_active)
1086 bond_set_slave_active_flags(new_active);
1da177e4
LT		 1087 } else {
1088 bond->curr_active_slave = new_active;
1089 }
c3ade5ca
JV		 1090
1091 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1092 if (old_active) {
1093 bond_set_slave_inactive_flags(old_active);
1094 }
1095
1096 if (new_active) {
1097 bond_set_slave_active_flags(new_active);
1098 }
1099 bond_send_gratuitous_arp(bond);
1100 }
1da177e4
LT		 1101}
1102
1103/**
1104 * bond_select_active_slave - select a new active slave, if needed
1105 * @bond: our bonding struct
1106 *
1107 * This functions shoud be called when one of the following occurs:
1108 * - The old curr_active_slave has been released or lost its link.
1109 * - The primary_slave has got its link back.
1110 * - A slave has got its link back and there's no old curr_active_slave.
1111 *
1112 * Warning: Caller must hold curr_slave_lock for writing.
1113 */
a77b5325 1114void bond_select_active_slave(struct bonding *bond)
1da177e4
LT		 1115{
1116 struct slave *best_slave;
ff59c456 1117 int rv;
1da177e4
LT		 1118
1119 best_slave = bond_find_best_slave(bond);
1120 if (best_slave != bond->curr_active_slave) {
1121 bond_change_active_slave(bond, best_slave);
ff59c456
JV		 1122 rv = bond_set_carrier(bond);
1123 if (!rv)
1124 return;
1125
1126 if (netif_carrier_ok(bond->dev)) {
1127 printk(KERN_INFO DRV_NAME
1128 ": %s: first active interface up!\n",
1129 bond->dev->name);
1130 } else {
1131 printk(KERN_INFO DRV_NAME ": %s: "
1132 "now running without any active interface !\n",
1133 bond->dev->name);
1134 }
1da177e4
LT		 1135 }
1136}
1137
1138/*--------------------------- slave list handling ---------------------------*/
1139
1140/*
1141 * This function attaches the slave to the end of list.
1142 *
1143 * bond->lock held for writing by caller.
1144 */
1145static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1146{
1147 if (bond->first_slave == NULL) { /* attaching the first slave */
1148 new_slave->next = new_slave;
1149 new_slave->prev = new_slave;
1150 bond->first_slave = new_slave;
1151 } else {
1152 new_slave->next = bond->first_slave;
1153 new_slave->prev = bond->first_slave->prev;
1154 new_slave->next->prev = new_slave;
1155 new_slave->prev->next = new_slave;
1156 }
1157
1158 bond->slave_cnt++;
1159}
1160
1161/*
1162 * This function detaches the slave from the list.
1163 * WARNING: no check is made to verify if the slave effectively
1164 * belongs to <bond>.
1165 * Nothing is freed on return, structures are just unchained.
1166 * If any slave pointer in bond was pointing to <slave>,
1167 * it should be changed by the calling function.
1168 *
1169 * bond->lock held for writing by caller.
1170 */
1171static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1172{
1173 if (slave->next) {
1174 slave->next->prev = slave->prev;
1175 }
1176
1177 if (slave->prev) {
1178 slave->prev->next = slave->next;
1179 }
1180
1181 if (bond->first_slave == slave) { /* slave is the first slave */
1182 if (bond->slave_cnt > 1) { /* there are more slave */
1183 bond->first_slave = slave->next;
1184 } else {
1185 bond->first_slave = NULL; /* slave was the last one */
1186 }
1187 }
1188
1189 slave->next = NULL;
1190 slave->prev = NULL;
1191 bond->slave_cnt--;
1192}
1193
1194/*---------------------------------- IOCTL ----------------------------------*/
1195
4ad072c9
AB		 1196static int bond_sethwaddr(struct net_device *bond_dev,
1197 struct net_device *slave_dev)
1da177e4
LT		 1198{
1199 dprintk("bond_dev=%p\n", bond_dev);
1200 dprintk("slave_dev=%p\n", slave_dev);
1201 dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1202 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1203 return 0;
1204}
1205
7f353bf2
HX		 1206#define BOND_VLAN_FEATURES \
1207 (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1208 NETIF_F_HW_VLAN_FILTER)
8531c5ff
AK		 1209
1210/*
8e3babcd 1211 * Compute the common dev->feature set available to all slaves. Some
7f353bf2
HX		 1212 * feature bits are managed elsewhere, so preserve those feature bits
1213 * on the master device.
8531c5ff
AK		 1214 */
1215static int bond_compute_features(struct bonding *bond)
1216{
8531c5ff
AK		 1217 struct slave *slave;
1218 struct net_device *bond_dev = bond->dev;
7f353bf2 1219 unsigned long features = bond_dev->features;
54ef3137 1220 unsigned short max_hard_header_len = ETH_HLEN;
8e3babcd 1221 int i;
8531c5ff 1222
7f353bf2
HX		 1223 features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1224 features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
1225 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1226
54ef3137 1227 bond_for_each_slave(bond, slave, i) {
7f353bf2
HX		 1228 features = netdev_compute_features(features,
1229 slave->dev->features);
54ef3137
JV		 1230 if (slave->dev->hard_header_len > max_hard_header_len)
1231 max_hard_header_len = slave->dev->hard_header_len;
1232 }
8531c5ff 1233
7f353bf2 1234 features |= (bond_dev->features & BOND_VLAN_FEATURES);
8531c5ff 1235 bond_dev->features = features;
54ef3137 1236 bond_dev->hard_header_len = max_hard_header_len;
8531c5ff
AK		 1237
1238 return 0;
1239}
1240
1da177e4 1241/* enslave device <slave> to bond device <master> */
a77b5325 1242int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1243{
1244 struct bonding *bond = bond_dev->priv;
1245 struct slave *new_slave = NULL;
1246 struct dev_mc_list *dmi;
1247 struct sockaddr addr;
1248 int link_reporting;
1249 int old_features = bond_dev->features;
1250 int res = 0;
1251
552709d5 1252 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1253 slave_dev->do_ioctl == NULL) {
1da177e4 1254 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1255 ": %s: Warning: no link monitoring support for %s\n",
1256 bond_dev->name, slave_dev->name);
1da177e4
LT		 1257 }
1258
1259 /* bond must be initialized by bond_open() before enslaving */
1260 if (!(bond_dev->flags & IFF_UP)) {
1261 dprintk("Error, master_dev is not up\n");
1262 return -EPERM;
1263 }
1264
1265 /* already enslaved */
1266 if (slave_dev->flags & IFF_SLAVE) {
1267 dprintk("Error, Device was already enslaved\n");
1268 return -EBUSY;
1269 }
1270
1271 /* vlan challenged mutual exclusion */
1272 /* no need to lock since we're protected by rtnl_lock */
1273 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1274 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1275 if (!list_empty(&bond->vlan_list)) {
1276 printk(KERN_ERR DRV_NAME
4e0952c7 1277 ": %s: Error: cannot enslave VLAN "
1da177e4 1278 "challenged slave %s on VLAN enabled "
4e0952c7 1279 "bond %s\n", bond_dev->name, slave_dev->name,
1da177e4
LT		 1280 bond_dev->name);
1281 return -EPERM;
1282 } else {
1283 printk(KERN_WARNING DRV_NAME
4e0952c7 1284 ": %s: Warning: enslaved VLAN challenged "
1da177e4
LT		 1285 "slave %s. Adding VLANs will be blocked as "
1286 "long as %s is part of bond %s\n",
4e0952c7 1287 bond_dev->name, slave_dev->name, slave_dev->name,
1da177e4
LT		 1288 bond_dev->name);
1289 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1290 }
1291 } else {
1292 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1293 if (bond->slave_cnt == 0) {
1294 /* First slave, and it is not VLAN challenged,
1295 * so remove the block of adding VLANs over the bond.
1296 */
1297 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1298 }
1299 }
1300
217df670
JV		 1301 /*
1302 * Old ifenslave binaries are no longer supported. These can
1303 * be identified with moderate accurary by the state of the slave:
1304 * the current ifenslave will set the interface down prior to
1305 * enslaving it; the old ifenslave will not.
1306 */
1307 if ((slave_dev->flags & IFF_UP)) {
1308 printk(KERN_ERR DRV_NAME ": %s is up. "
1309 "This may be due to an out of date ifenslave.\n",
1310 slave_dev->name);
1311 res = -EPERM;
1312 goto err_undo_flags;
1313 }
1da177e4 1314
217df670
JV		 1315 if (slave_dev->set_mac_address == NULL) {
1316 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 1317 ": %s: Error: The slave device you specified does "
1318 "not support setting the MAC address. "
1319 "Your kernel likely does not support slave "
1320 "devices.\n", bond_dev->name);
1321 res = -EOPNOTSUPP;
217df670 1322 goto err_undo_flags;
1da177e4
LT		 1323 }
1324
243cb4e5 1325 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1da177e4
LT		 1326 if (!new_slave) {
1327 res = -ENOMEM;
1328 goto err_undo_flags;
1329 }
1330
1da177e4
LT		 1331 /* save slave's original flags before calling
1332 * netdev_set_master and dev_open
1333 */
1334 new_slave->original_flags = slave_dev->flags;
1335
217df670
JV		 1336 /*
1337 * Save slave's original ("permanent") mac address for modes
1338 * that need it, and for restoring it upon release, and then
1339 * set it to the master's address
1340 */
1341 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1da177e4 1342
217df670
JV		 1343 /*
1344 * Set slave to master's mac address. The application already
1345 * set the master's mac address to that of the first slave
1346 */
1347 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1348 addr.sa_family = slave_dev->type;
1349 res = dev_set_mac_address(slave_dev, &addr);
1350 if (res) {
1351 dprintk("Error %d calling set_mac_address\n", res);
1352 goto err_free;
1353 }
1da177e4 1354
c2edacf8
JV		 1355 res = netdev_set_master(slave_dev, bond_dev);
1356 if (res) {
1357 dprintk("Error %d calling netdev_set_master\n", res);
1358 goto err_close;
1359 }
217df670
JV		 1360 /* open the slave since the application closed it */
1361 res = dev_open(slave_dev);
1362 if (res) {
1363 dprintk("Openning slave %s failed\n", slave_dev->name);
1364 goto err_restore_mac;
1da177e4
LT		 1365 }
1366
1da177e4 1367 new_slave->dev = slave_dev;
0b680e75 1368 slave_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 1369
1370 if ((bond->params.mode == BOND_MODE_TLB) ||
1371 (bond->params.mode == BOND_MODE_ALB)) {
1372 /* bond_alb_init_slave() must be called before all other stages since
1373 * it might fail and we do not want to have to undo everything
1374 */
1375 res = bond_alb_init_slave(bond, new_slave);
1376 if (res) {
1377 goto err_unset_master;
1378 }
1379 }
1380
1381 /* If the mode USES_PRIMARY, then the new slave gets the
1382 * master's promisc (and mc) settings only if it becomes the
1383 * curr_active_slave, and that is taken care of later when calling
1384 * bond_change_active()
1385 */
1386 if (!USES_PRIMARY(bond->params.mode)) {
1387 /* set promiscuity level to new slave */
1388 if (bond_dev->flags & IFF_PROMISC) {
1389 dev_set_promiscuity(slave_dev, 1);
1390 }
1391
1392 /* set allmulti level to new slave */
1393 if (bond_dev->flags & IFF_ALLMULTI) {
1394 dev_set_allmulti(slave_dev, 1);
1395 }
1396
1397 /* upload master's mc_list to new slave */
1398 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1399 dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1400 }
1401 }
1402
1403 if (bond->params.mode == BOND_MODE_8023AD) {
1404 /* add lacpdu mc addr to mc list */
1405 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1406
1407 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1408 }
1409
1410 bond_add_vlans_on_slave(bond, slave_dev);
1411
1412 write_lock_bh(&bond->lock);
1413
1414 bond_attach_slave(bond, new_slave);
1415
1416 new_slave->delay = 0;
1417 new_slave->link_failure_count = 0;
1418
8531c5ff
AK		 1419 bond_compute_features(bond);
1420
f5b2b966
JV		 1421 new_slave->last_arp_rx = jiffies;
1422
1da177e4
LT		 1423 if (bond->params.miimon && !bond->params.use_carrier) {
1424 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1425
1426 if ((link_reporting == -1) && !bond->params.arp_interval) {
1427 /*
1428 * miimon is set but a bonded network driver
1429 * does not support ETHTOOL/MII and
1430 * arp_interval is not set. Note: if
1431 * use_carrier is enabled, we will never go
1432 * here (because netif_carrier is always
1433 * supported); thus, we don't need to change
1434 * the messages for netif_carrier.
1435 */
1436 printk(KERN_WARNING DRV_NAME
4e0952c7 1437 ": %s: Warning: MII and ETHTOOL support not "
1da177e4
LT		 1438 "available for interface %s, and "
1439 "arp_interval/arp_ip_target module parameters "
1440 "not specified, thus bonding will not detect "
1441 "link failures! see bonding.txt for details.\n",
4e0952c7 1442 bond_dev->name, slave_dev->name);
1da177e4
LT		 1443 } else if (link_reporting == -1) {
1444 /* unable get link status using mii/ethtool */
1445 printk(KERN_WARNING DRV_NAME
4e0952c7 1446 ": %s: Warning: can't get link status from "
1da177e4
LT		 1447 "interface %s; the network driver associated "
1448 "with this interface does not support MII or "
1449 "ETHTOOL link status reporting, thus miimon "
1450 "has no effect on this interface.\n",
4e0952c7 1451 bond_dev->name, slave_dev->name);
1da177e4
LT		 1452 }
1453 }
1454
1455 /* check for initial state */
1456 if (!bond->params.miimon ||
1457 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1458 if (bond->params.updelay) {
1459 dprintk("Initial state of slave_dev is "
1460 "BOND_LINK_BACK\n");
1461 new_slave->link = BOND_LINK_BACK;
1462 new_slave->delay = bond->params.updelay;
1463 } else {
1464 dprintk("Initial state of slave_dev is "
1465 "BOND_LINK_UP\n");
1466 new_slave->link = BOND_LINK_UP;
1467 }
1468 new_slave->jiffies = jiffies;
1469 } else {
1470 dprintk("Initial state of slave_dev is "
1471 "BOND_LINK_DOWN\n");
1472 new_slave->link = BOND_LINK_DOWN;
1473 }
1474
1475 if (bond_update_speed_duplex(new_slave) &&
1476 (new_slave->link != BOND_LINK_DOWN)) {
1477 printk(KERN_WARNING DRV_NAME
4e0952c7 1478 ": %s: Warning: failed to get speed and duplex from %s, "
1da177e4 1479 "assumed to be 100Mb/sec and Full.\n",
4e0952c7 1480 bond_dev->name, new_slave->dev->name);
1da177e4
LT		 1481
1482 if (bond->params.mode == BOND_MODE_8023AD) {
4e0952c7
MW		 1483 printk(KERN_WARNING DRV_NAME
1484 ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1da177e4 1485 "support in base driver for proper aggregator "
4e0952c7 1486 "selection.\n", bond_dev->name);
1da177e4
LT		 1487 }
1488 }
1489
1490 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1491 /* if there is a primary slave, remember it */
1492 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1493 bond->primary_slave = new_slave;
1494 }
1495 }
1496
1497 switch (bond->params.mode) {
1498 case BOND_MODE_ACTIVEBACKUP:
8a8e447b
JV		 1499 bond_set_slave_inactive_flags(new_slave);
1500 bond_select_active_slave(bond);
1da177e4
LT		 1501 break;
1502 case BOND_MODE_8023AD:
1503 /* in 802.3ad mode, the internal mechanism
1504 * will activate the slaves in the selected
1505 * aggregator
1506 */
1507 bond_set_slave_inactive_flags(new_slave);
1508 /* if this is the first slave */
1509 if (bond->slave_cnt == 1) {
1510 SLAVE_AD_INFO(new_slave).id = 1;
1511 /* Initialize AD with the number of times that the AD timer is called in 1 second
1512 * can be called only after the mac address of the bond is set
1513 */
1514 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1515 bond->params.lacp_fast);
1516 } else {
1517 SLAVE_AD_INFO(new_slave).id =
1518 SLAVE_AD_INFO(new_slave->prev).id + 1;
1519 }
1520
1521 bond_3ad_bind_slave(new_slave);
1522 break;
1523 case BOND_MODE_TLB:
1524 case BOND_MODE_ALB:
1525 new_slave->state = BOND_STATE_ACTIVE;
1526 if ((!bond->curr_active_slave) &&
1527 (new_slave->link != BOND_LINK_DOWN)) {
1528 /* first slave or no active slave yet, and this link
1529 * is OK, so make this interface the active one
1530 */
1531 bond_change_active_slave(bond, new_slave);
8f903c70
JV		 1532 } else {
1533 bond_set_slave_inactive_flags(new_slave);
1da177e4
LT		 1534 }
1535 break;
1536 default:
1537 dprintk("This slave is always active in trunk mode\n");
1538
1539 /* always active in trunk mode */
1540 new_slave->state = BOND_STATE_ACTIVE;
1541
1542 /* In trunking mode there is little meaning to curr_active_slave
1543 * anyway (it holds no special properties of the bond device),
1544 * so we can change it without calling change_active_interface()
1545 */
1546 if (!bond->curr_active_slave) {
1547 bond->curr_active_slave = new_slave;
1548 }
1549 break;
1550 } /* switch(bond_mode) */
1551
ff59c456
JV		 1552 bond_set_carrier(bond);
1553
1da177e4
LT		 1554 write_unlock_bh(&bond->lock);
1555
b76cdba9
MW		 1556 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1557 if (res)
1558 goto err_unset_master;
1559
1da177e4
LT		 1560 printk(KERN_INFO DRV_NAME
1561 ": %s: enslaving %s as a%s interface with a%s link.\n",
1562 bond_dev->name, slave_dev->name,
1563 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1564 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1565
1566 /* enslave is successful */
1567 return 0;
1568
1569/* Undo stages on error */
1570err_unset_master:
1571 netdev_set_master(slave_dev, NULL);
1572
1573err_close:
1574 dev_close(slave_dev);
1575
1576err_restore_mac:
1577 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1578 addr.sa_family = slave_dev->type;
1579 dev_set_mac_address(slave_dev, &addr);
1580
1581err_free:
1582 kfree(new_slave);
1583
1584err_undo_flags:
1585 bond_dev->features = old_features;
8531c5ff 1586
1da177e4
LT		 1587 return res;
1588}
1589
1590/*
1591 * Try to release the slave device <slave> from the bond device <master>
1592 * It is legal to access curr_active_slave without a lock because all the function
1593 * is write-locked.
1594 *
1595 * The rules for slave state should be:
1596 * for Active/Backup:
1597 * Active stays on all backups go down
1598 * for Bonded connections:
1599 * The first up interface should be left on and all others downed.
1600 */
a77b5325 1601int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1602{
1603 struct bonding *bond = bond_dev->priv;
1604 struct slave *slave, *oldcurrent;
1605 struct sockaddr addr;
1606 int mac_addr_differ;
0795af57 1607 DECLARE_MAC_BUF(mac);
1da177e4
LT		 1608
1609 /* slave is not a slave or master is not master of this slave */
1610 if (!(slave_dev->flags & IFF_SLAVE) ||
1611 (slave_dev->master != bond_dev)) {
1612 printk(KERN_ERR DRV_NAME
4e0952c7 1613 ": %s: Error: cannot release %s.\n",
1da177e4
LT		 1614 bond_dev->name, slave_dev->name);
1615 return -EINVAL;
1616 }
1617
1618 write_lock_bh(&bond->lock);
1619
1620 slave = bond_get_slave_by_dev(bond, slave_dev);
1621 if (!slave) {
1622 /* not a slave of this bond */
1623 printk(KERN_INFO DRV_NAME
1624 ": %s: %s not enslaved\n",
1625 bond_dev->name, slave_dev->name);
f5e2a7b2 1626 write_unlock_bh(&bond->lock);
1da177e4
LT		 1627 return -EINVAL;
1628 }
1629
1630 mac_addr_differ = memcmp(bond_dev->dev_addr,
1631 slave->perm_hwaddr,
1632 ETH_ALEN);
1633 if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1634 printk(KERN_WARNING DRV_NAME
0795af57
JP		 1635 ": %s: Warning: the permanent HWaddr of %s - "
1636 "%s - is still in use by %s. "
1637 "Set the HWaddr of %s to a different address "
1638 "to avoid conflicts.\n",
4e0952c7 1639 bond_dev->name,
1da177e4 1640 slave_dev->name,
0795af57 1641 print_mac(mac, slave->perm_hwaddr),
1da177e4
LT		 1642 bond_dev->name,
1643 slave_dev->name);
1644 }
1645
1646 /* Inform AD package of unbinding of slave. */
1647 if (bond->params.mode == BOND_MODE_8023AD) {
1648 /* must be called before the slave is
1649 * detached from the list
1650 */
1651 bond_3ad_unbind_slave(slave);
1652 }
1653
1654 printk(KERN_INFO DRV_NAME
1655 ": %s: releasing %s interface %s\n",
1656 bond_dev->name,
1657 (slave->state == BOND_STATE_ACTIVE)
1658 ? "active" : "backup",
1659 slave_dev->name);
1660
1661 oldcurrent = bond->curr_active_slave;
1662
1663 bond->current_arp_slave = NULL;
1664
1665 /* release the slave from its bond */
1666 bond_detach_slave(bond, slave);
1667
8531c5ff
AK		 1668 bond_compute_features(bond);
1669
1da177e4
LT		 1670 if (bond->primary_slave == slave) {
1671 bond->primary_slave = NULL;
1672 }
1673
1674 if (oldcurrent == slave) {
1675 bond_change_active_slave(bond, NULL);
1676 }
1677
1678 if ((bond->params.mode == BOND_MODE_TLB) ||
1679 (bond->params.mode == BOND_MODE_ALB)) {
1680 /* Must be called only after the slave has been
1681 * detached from the list and the curr_active_slave
1682 * has been cleared (if our_slave == old_current),
1683 * but before a new active slave is selected.
1684 */
1685 bond_alb_deinit_slave(bond, slave);
1686 }
1687
ff59c456 1688 if (oldcurrent == slave)
1da177e4
LT		 1689 bond_select_active_slave(bond);
1690
1da177e4 1691 if (bond->slave_cnt == 0) {
ff59c456
JV		 1692 bond_set_carrier(bond);
1693
1da177e4
LT		 1694 /* if the last slave was removed, zero the mac address
1695 * of the master so it will be set by the application
1696 * to the mac address of the first slave
1697 */
1698 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1699
1700 if (list_empty(&bond->vlan_list)) {
1701 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1702 } else {
1703 printk(KERN_WARNING DRV_NAME
4e0952c7 1704 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1705 "still has VLANs.\n",
4e0952c7 1706 bond_dev->name, bond_dev->name);
1da177e4 1707 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1708 ": %s: When re-adding slaves, make sure the bond's "
1709 "HW address matches its VLANs'.\n",
1710 bond_dev->name);
1da177e4
LT		 1711 }
1712 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1713 !bond_has_challenged_slaves(bond)) {
1714 printk(KERN_INFO DRV_NAME
4e0952c7 1715 ": %s: last VLAN challenged slave %s "
1da177e4 1716 "left bond %s. VLAN blocking is removed\n",
4e0952c7 1717 bond_dev->name, slave_dev->name, bond_dev->name);
1da177e4
LT		 1718 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1719 }
1720
1721 write_unlock_bh(&bond->lock);
1722
b76cdba9
MW		 1723 /* must do this from outside any spinlocks */
1724 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1725
1da177e4
LT		 1726 bond_del_vlans_from_slave(bond, slave_dev);
1727
1728 /* If the mode USES_PRIMARY, then we should only remove its
1729 * promisc and mc settings if it was the curr_active_slave, but that was
1730 * already taken care of above when we detached the slave
1731 */
1732 if (!USES_PRIMARY(bond->params.mode)) {
1733 /* unset promiscuity level from slave */
1734 if (bond_dev->flags & IFF_PROMISC) {
1735 dev_set_promiscuity(slave_dev, -1);
1736 }
1737
1738 /* unset allmulti level from slave */
1739 if (bond_dev->flags & IFF_ALLMULTI) {
1740 dev_set_allmulti(slave_dev, -1);
1741 }
1742
1743 /* flush master's mc_list from slave */
1744 bond_mc_list_flush(bond_dev, slave_dev);
1745 }
1746
1747 netdev_set_master(slave_dev, NULL);
1748
1749 /* close slave before restoring its mac address */
1750 dev_close(slave_dev);
1751
217df670
JV		 1752 /* restore original ("permanent") mac address */
1753 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1754 addr.sa_family = slave_dev->type;
1755 dev_set_mac_address(slave_dev, &addr);
1da177e4 1756
8f903c70 1757 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
f5b2b966
JV		 1758 IFF_SLAVE_INACTIVE | IFF_BONDING |
1759 IFF_SLAVE_NEEDARP);
1da177e4
LT		 1760
1761 kfree(slave);
1762
1763 return 0; /* deletion OK */
1764}
1765
1766/*
1767 * This function releases all slaves.
1768 */
1769static int bond_release_all(struct net_device *bond_dev)
1770{
1771 struct bonding *bond = bond_dev->priv;
1772 struct slave *slave;
1773 struct net_device *slave_dev;
1774 struct sockaddr addr;
1775
1776 write_lock_bh(&bond->lock);
1777
ff59c456
JV		 1778 netif_carrier_off(bond_dev);
1779
1da177e4
LT		 1780 if (bond->slave_cnt == 0) {
1781 goto out;
1782 }
1783
1784 bond->current_arp_slave = NULL;
1785 bond->primary_slave = NULL;
1786 bond_change_active_slave(bond, NULL);
1787
1788 while ((slave = bond->first_slave) != NULL) {
1789 /* Inform AD package of unbinding of slave
1790 * before slave is detached from the list.
1791 */
1792 if (bond->params.mode == BOND_MODE_8023AD) {
1793 bond_3ad_unbind_slave(slave);
1794 }
1795
1796 slave_dev = slave->dev;
1797 bond_detach_slave(bond, slave);
1798
1799 if ((bond->params.mode == BOND_MODE_TLB) ||
1800 (bond->params.mode == BOND_MODE_ALB)) {
1801 /* must be called only after the slave
1802 * has been detached from the list
1803 */
1804 bond_alb_deinit_slave(bond, slave);
1805 }
1806
8531c5ff
AK		 1807 bond_compute_features(bond);
1808
1da177e4
LT		 1809 /* now that the slave is detached, unlock and perform
1810 * all the undo steps that should not be called from
1811 * within a lock.
1812 */
1813 write_unlock_bh(&bond->lock);
1814
b76cdba9 1815 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1da177e4
LT		 1816 bond_del_vlans_from_slave(bond, slave_dev);
1817
1818 /* If the mode USES_PRIMARY, then we should only remove its
1819 * promisc and mc settings if it was the curr_active_slave, but that was
1820 * already taken care of above when we detached the slave
1821 */
1822 if (!USES_PRIMARY(bond->params.mode)) {
1823 /* unset promiscuity level from slave */
1824 if (bond_dev->flags & IFF_PROMISC) {
1825 dev_set_promiscuity(slave_dev, -1);
1826 }
1827
1828 /* unset allmulti level from slave */
1829 if (bond_dev->flags & IFF_ALLMULTI) {
1830 dev_set_allmulti(slave_dev, -1);
1831 }
1832
1833 /* flush master's mc_list from slave */
1834 bond_mc_list_flush(bond_dev, slave_dev);
1835 }
1836
1837 netdev_set_master(slave_dev, NULL);
1838
1839 /* close slave before restoring its mac address */
1840 dev_close(slave_dev);
1841
217df670
JV		 1842 /* restore original ("permanent") mac address*/
1843 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1844 addr.sa_family = slave_dev->type;
1845 dev_set_mac_address(slave_dev, &addr);
1da177e4 1846
8f903c70
JV		 1847 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1848 IFF_SLAVE_INACTIVE);
1da177e4
LT		 1849
1850 kfree(slave);
1851
1852 /* re-acquire the lock before getting the next slave */
1853 write_lock_bh(&bond->lock);
1854 }
1855
1856 /* zero the mac address of the master so it will be
1857 * set by the application to the mac address of the
1858 * first slave
1859 */
1860 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1861
1862 if (list_empty(&bond->vlan_list)) {
1863 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1864 } else {
1865 printk(KERN_WARNING DRV_NAME
4e0952c7 1866 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1867 "still has VLANs.\n",
4e0952c7 1868 bond_dev->name, bond_dev->name);
1da177e4 1869 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1870 ": %s: When re-adding slaves, make sure the bond's "
1871 "HW address matches its VLANs'.\n",
1872 bond_dev->name);
1da177e4
LT		 1873 }
1874
1875 printk(KERN_INFO DRV_NAME
1876 ": %s: released all slaves\n",
1877 bond_dev->name);
1878
1879out:
1880 write_unlock_bh(&bond->lock);
1881
1882 return 0;
1883}
1884
1885/*
1886 * This function changes the active slave to slave <slave_dev>.
1887 * It returns -EINVAL in the following cases.
1888 * - <slave_dev> is not found in the list.
1889 * - There is not active slave now.
1890 * - <slave_dev> is already active.
1891 * - The link state of <slave_dev> is not BOND_LINK_UP.
1892 * - <slave_dev> is not running.
1893 * In these cases, this fuction does nothing.
1894 * In the other cases, currnt_slave pointer is changed and 0 is returned.
1895 */
1896static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1897{
1898 struct bonding *bond = bond_dev->priv;
1899 struct slave *old_active = NULL;
1900 struct slave *new_active = NULL;
1901 int res = 0;
1902
1903 if (!USES_PRIMARY(bond->params.mode)) {
1904 return -EINVAL;
1905 }
1906
1907 /* Verify that master_dev is indeed the master of slave_dev */
1908 if (!(slave_dev->flags & IFF_SLAVE) ||
1909 (slave_dev->master != bond_dev)) {
1910 return -EINVAL;
1911 }
1912
1913 write_lock_bh(&bond->lock);
1914
1915 old_active = bond->curr_active_slave;
1916 new_active = bond_get_slave_by_dev(bond, slave_dev);
1917
1918 /*
1919 * Changing to the current active: do nothing; return success.
1920 */
1921 if (new_active && (new_active == old_active)) {
1922 write_unlock_bh(&bond->lock);
1923 return 0;
1924 }
1925
1926 if ((new_active) &&
1927 (old_active) &&
1928 (new_active->link == BOND_LINK_UP) &&
1929 IS_UP(new_active->dev)) {
1930 bond_change_active_slave(bond, new_active);
1931 } else {
1932 res = -EINVAL;
1933 }
1934
1935 write_unlock_bh(&bond->lock);
1936
1937 return res;
1938}
1939
1da177e4
LT		 1940static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1941{
1942 struct bonding *bond = bond_dev->priv;
1943
1944 info->bond_mode = bond->params.mode;
1945 info->miimon = bond->params.miimon;
1946
1947 read_lock_bh(&bond->lock);
1948 info->num_slaves = bond->slave_cnt;
1949 read_unlock_bh(&bond->lock);
1950
1951 return 0;
1952}
1953
1954static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1955{
1956 struct bonding *bond = bond_dev->priv;
1957 struct slave *slave;
1958 int i, found = 0;
1959
1960 if (info->slave_id < 0) {
1961 return -ENODEV;
1962 }
1963
1964 read_lock_bh(&bond->lock);
1965
1966 bond_for_each_slave(bond, slave, i) {
1967 if (i == (int)info->slave_id) {
1968 found = 1;
1969 break;
1970 }
1971 }
1972
1973 read_unlock_bh(&bond->lock);
1974
1975 if (found) {
1976 strcpy(info->slave_name, slave->dev->name);
1977 info->link = slave->link;
1978 info->state = slave->state;
1979 info->link_failure_count = slave->link_failure_count;
1980 } else {
1981 return -ENODEV;
1982 }
1983
1984 return 0;
1985}
1986
1987/*-------------------------------- Monitoring -------------------------------*/
1988
1989/* this function is called regularly to monitor each slave's link. */
a77b5325 1990void bond_mii_monitor(struct net_device *bond_dev)
1da177e4
LT		 1991{
1992 struct bonding *bond = bond_dev->priv;
1993 struct slave *slave, *oldcurrent;
1994 int do_failover = 0;
1995 int delta_in_ticks;
1996 int i;
1997
1998 read_lock(&bond->lock);
1999
2000 delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2001
2002 if (bond->kill_timers) {
2003 goto out;
2004 }
2005
2006 if (bond->slave_cnt == 0) {
2007 goto re_arm;
2008 }
2009
2010 /* we will try to read the link status of each of our slaves, and
2011 * set their IFF_RUNNING flag appropriately. For each slave not
2012 * supporting MII status, we won't do anything so that a user-space
2013 * program could monitor the link itself if needed.
2014 */
2015
2016 read_lock(&bond->curr_slave_lock);
2017 oldcurrent = bond->curr_active_slave;
2018 read_unlock(&bond->curr_slave_lock);
2019
2020 bond_for_each_slave(bond, slave, i) {
2021 struct net_device *slave_dev = slave->dev;
2022 int link_state;
2023 u16 old_speed = slave->speed;
2024 u8 old_duplex = slave->duplex;
2025
2026 link_state = bond_check_dev_link(bond, slave_dev, 0);
2027
2028 switch (slave->link) {
2029 case BOND_LINK_UP: /* the link was up */
2030 if (link_state == BMSR_LSTATUS) {
2031 /* link stays up, nothing more to do */
2032 break;
2033 } else { /* link going down */
2034 slave->link = BOND_LINK_FAIL;
2035 slave->delay = bond->params.downdelay;
2036
2037 if (slave->link_failure_count < UINT_MAX) {
2038 slave->link_failure_count++;
2039 }
2040
2041 if (bond->params.downdelay) {
2042 printk(KERN_INFO DRV_NAME
2043 ": %s: link status down for %s "
2044 "interface %s, disabling it in "
2045 "%d ms.\n",
2046 bond_dev->name,
2047 IS_UP(slave_dev)
2048 ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2049 ? ((slave == oldcurrent)
2050 ? "active " : "backup ")
2051 : "")
2052 : "idle ",
2053 slave_dev->name,
2054 bond->params.downdelay * bond->params.miimon);
2055 }
2056 }
2057 /* no break ! fall through the BOND_LINK_FAIL test to
2058 ensure proper action to be taken
2059 */
2060 case BOND_LINK_FAIL: /* the link has just gone down */
2061 if (link_state != BMSR_LSTATUS) {
2062 /* link stays down */
2063 if (slave->delay <= 0) {
2064 /* link down for too long time */
2065 slave->link = BOND_LINK_DOWN;
2066
2067 /* in active/backup mode, we must
2068 * completely disable this interface
2069 */
2070 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2071 (bond->params.mode == BOND_MODE_8023AD)) {
2072 bond_set_slave_inactive_flags(slave);
2073 }
2074
2075 printk(KERN_INFO DRV_NAME
2076 ": %s: link status definitely "
2077 "down for interface %s, "
2078 "disabling it\n",
2079 bond_dev->name,
2080 slave_dev->name);
2081
2082 /* notify ad that the link status has changed */
2083 if (bond->params.mode == BOND_MODE_8023AD) {
2084 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2085 }
2086
2087 if ((bond->params.mode == BOND_MODE_TLB) ||
2088 (bond->params.mode == BOND_MODE_ALB)) {
2089 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2090 }
2091
2092 if (slave == oldcurrent) {
2093 do_failover = 1;
2094 }
2095 } else {
2096 slave->delay--;
2097 }
2098 } else {
2099 /* link up again */
2100 slave->link = BOND_LINK_UP;
2101 slave->jiffies = jiffies;
2102 printk(KERN_INFO DRV_NAME
2103 ": %s: link status up again after %d "
2104 "ms for interface %s.\n",
2105 bond_dev->name,
2106 (bond->params.downdelay - slave->delay) * bond->params.miimon,
2107 slave_dev->name);
2108 }
2109 break;
2110 case BOND_LINK_DOWN: /* the link was down */
2111 if (link_state != BMSR_LSTATUS) {
2112 /* the link stays down, nothing more to do */
2113 break;
2114 } else { /* link going up */
2115 slave->link = BOND_LINK_BACK;
2116 slave->delay = bond->params.updelay;
2117
2118 if (bond->params.updelay) {
2119 /* if updelay == 0, no need to
2120 advertise about a 0 ms delay */
2121 printk(KERN_INFO DRV_NAME
2122 ": %s: link status up for "
2123 "interface %s, enabling it "
2124 "in %d ms.\n",
2125 bond_dev->name,
2126 slave_dev->name,
2127 bond->params.updelay * bond->params.miimon);
2128 }
2129 }
2130 /* no break ! fall through the BOND_LINK_BACK state in
2131 case there's something to do.
2132 */
2133 case BOND_LINK_BACK: /* the link has just come back */
2134 if (link_state != BMSR_LSTATUS) {
2135 /* link down again */
2136 slave->link = BOND_LINK_DOWN;
2137
2138 printk(KERN_INFO DRV_NAME
2139 ": %s: link status down again after %d "
2140 "ms for interface %s.\n",
2141 bond_dev->name,
2142 (bond->params.updelay - slave->delay) * bond->params.miimon,
2143 slave_dev->name);
2144 } else {
2145 /* link stays up */
2146 if (slave->delay == 0) {
2147 /* now the link has been up for long time enough */
2148 slave->link = BOND_LINK_UP;
2149 slave->jiffies = jiffies;
2150
2151 if (bond->params.mode == BOND_MODE_8023AD) {
2152 /* prevent it from being the active one */
2153 slave->state = BOND_STATE_BACKUP;
2154 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2155 /* make it immediately active */
2156 slave->state = BOND_STATE_ACTIVE;
2157 } else if (slave != bond->primary_slave) {
2158 /* prevent it from being the active one */
2159 slave->state = BOND_STATE_BACKUP;
2160 }
2161
2162 printk(KERN_INFO DRV_NAME
2163 ": %s: link status definitely "
2164 "up for interface %s.\n",
2165 bond_dev->name,
2166 slave_dev->name);
2167
2168 /* notify ad that the link status has changed */
2169 if (bond->params.mode == BOND_MODE_8023AD) {
2170 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2171 }
2172
2173 if ((bond->params.mode == BOND_MODE_TLB) ||
2174 (bond->params.mode == BOND_MODE_ALB)) {
2175 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2176 }
2177
2178 if ((!oldcurrent) ||
2179 (slave == bond->primary_slave)) {
2180 do_failover = 1;
2181 }
2182 } else {
2183 slave->delay--;
2184 }
2185 }
2186 break;
2187 default:
2188 /* Should not happen */
4e0952c7
MW		 2189 printk(KERN_ERR DRV_NAME
2190 ": %s: Error: %s Illegal value (link=%d)\n",
2191 bond_dev->name,
2192 slave->dev->name,
2193 slave->link);
1da177e4
LT		 2194 goto out;
2195 } /* end of switch (slave->link) */
2196
2197 bond_update_speed_duplex(slave);
2198
2199 if (bond->params.mode == BOND_MODE_8023AD) {
2200 if (old_speed != slave->speed) {
2201 bond_3ad_adapter_speed_changed(slave);
2202 }
2203
2204 if (old_duplex != slave->duplex) {
2205 bond_3ad_adapter_duplex_changed(slave);
2206 }
2207 }
2208
2209 } /* end of for */
2210
2211 if (do_failover) {
2212 write_lock(&bond->curr_slave_lock);
2213
2214 bond_select_active_slave(bond);
2215
1da177e4 2216 write_unlock(&bond->curr_slave_lock);
ff59c456
JV		 2217 } else
2218 bond_set_carrier(bond);
1da177e4
LT		 2219
2220re_arm:
2221 if (bond->params.miimon) {
2222 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2223 }
2224out:
2225 read_unlock(&bond->lock);
2226}
2227
c3ade5ca
JV		 2228
2229static u32 bond_glean_dev_ip(struct net_device *dev)
2230{
2231 struct in_device *idev;
2232 struct in_ifaddr *ifa;
a144ea4b 2233 __be32 addr = 0;
c3ade5ca
JV		 2234
2235 if (!dev)
2236 return 0;
2237
2238 rcu_read_lock();
e5ed6399 2239 idev = __in_dev_get_rcu(dev);
c3ade5ca
JV		 2240 if (!idev)
2241 goto out;
2242
2243 ifa = idev->ifa_list;
2244 if (!ifa)
2245 goto out;
2246
2247 addr = ifa->ifa_local;
2248out:
2249 rcu_read_unlock();
2250 return addr;
2251}
2252
2253static int bond_has_ip(struct bonding *bond)
2254{
2255 struct vlan_entry *vlan, *vlan_next;
2256
2257 if (bond->master_ip)
2258 return 1;
2259
2260 if (list_empty(&bond->vlan_list))
2261 return 0;
2262
2263 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2264 vlan_list) {
2265 if (vlan->vlan_ip)
2266 return 1;
2267 }
2268
2269 return 0;
2270}
2271
f5b2b966
JV		 2272static int bond_has_this_ip(struct bonding *bond, u32 ip)
2273{
2274 struct vlan_entry *vlan, *vlan_next;
2275
2276 if (ip == bond->master_ip)
2277 return 1;
2278
2279 if (list_empty(&bond->vlan_list))
2280 return 0;
2281
2282 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2283 vlan_list) {
2284 if (ip == vlan->vlan_ip)
2285 return 1;
2286 }
2287
2288 return 0;
2289}
2290
c3ade5ca
JV		 2291/*
2292 * We go to the (large) trouble of VLAN tagging ARP frames because
2293 * switches in VLAN mode (especially if ports are configured as
2294 * "native" to a VLAN) might not pass non-tagged frames.
2295 */
2296static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2297{
2298 struct sk_buff *skb;
2299
2300 dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2301 slave_dev->name, dest_ip, src_ip, vlan_id);
2302
2303 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2304 NULL, slave_dev->dev_addr, NULL);
2305
2306 if (!skb) {
2307 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2308 return;
2309 }
2310 if (vlan_id) {
2311 skb = vlan_put_tag(skb, vlan_id);
2312 if (!skb) {
2313 printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2314 return;
2315 }
2316 }
2317 arp_xmit(skb);
2318}
2319
2320
1da177e4
LT		 2321static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2322{
c3ade5ca 2323 int i, vlan_id, rv;
1da177e4 2324 u32 *targets = bond->params.arp_targets;
c3ade5ca
JV		 2325 struct vlan_entry *vlan, *vlan_next;
2326 struct net_device *vlan_dev;
2327 struct flowi fl;
2328 struct rtable *rt;
1da177e4 2329
6b780567
MW		 2330 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2331 if (!targets[i])
2332 continue;
c3ade5ca
JV		 2333 dprintk("basa: target %x\n", targets[i]);
2334 if (list_empty(&bond->vlan_list)) {
2335 dprintk("basa: empty vlan: arp_send\n");
2336 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2337 bond->master_ip, 0);
2338 continue;
2339 }
2340
2341 /*
2342 * If VLANs are configured, we do a route lookup to
2343 * determine which VLAN interface would be used, so we
2344 * can tag the ARP with the proper VLAN tag.
2345 */
2346 memset(&fl, 0, sizeof(fl));
2347 fl.fl4_dst = targets[i];
2348 fl.fl4_tos = RTO_ONLINK;
2349
2350 rv = ip_route_output_key(&rt, &fl);
2351 if (rv) {
2352 if (net_ratelimit()) {
2353 printk(KERN_WARNING DRV_NAME
2354 ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2355 bond->dev->name, NIPQUAD(fl.fl4_dst));
2356 }
2357 continue;
2358 }
2359
2360 /*
2361 * This target is not on a VLAN
2362 */
2363 if (rt->u.dst.dev == bond->dev) {
ed4b9f80 2364 ip_rt_put(rt);
c3ade5ca
JV		 2365 dprintk("basa: rtdev == bond->dev: arp_send\n");
2366 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2367 bond->master_ip, 0);
2368 continue;
2369 }
2370
2371 vlan_id = 0;
2372 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2373 vlan_list) {
5c15bdec 2374 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 2375 if (vlan_dev == rt->u.dst.dev) {
2376 vlan_id = vlan->vlan_id;
2377 dprintk("basa: vlan match on %s %d\n",
2378 vlan_dev->name, vlan_id);
2379 break;
2380 }
2381 }
2382
2383 if (vlan_id) {
ed4b9f80 2384 ip_rt_put(rt);
c3ade5ca
JV		 2385 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2386 vlan->vlan_ip, vlan_id);
2387 continue;
2388 }
2389
2390 if (net_ratelimit()) {
2391 printk(KERN_WARNING DRV_NAME
2392 ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2393 bond->dev->name, NIPQUAD(fl.fl4_dst),
2394 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2395 }
ed4b9f80 2396 ip_rt_put(rt);
c3ade5ca
JV		 2397 }
2398}
2399
2400/*
2401 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2402 * for each VLAN above us.
2403 */
2404static void bond_send_gratuitous_arp(struct bonding *bond)
2405{
2406 struct slave *slave = bond->curr_active_slave;
2407 struct vlan_entry *vlan;
2408 struct net_device *vlan_dev;
2409
2410 dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2411 slave ? slave->dev->name : "NULL");
2412 if (!slave)
2413 return;
2414
2415 if (bond->master_ip) {
2416 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2417 bond->master_ip, 0);
2418 }
2419
2420 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
5c15bdec 2421 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 2422 if (vlan->vlan_ip) {
2423 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2424 vlan->vlan_ip, vlan->vlan_id);
2425 }
1da177e4
LT		 2426 }
2427}
2428
f5b2b966
JV		 2429static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
2430{
2431 int i;
2432 u32 *targets = bond->params.arp_targets;
2433
2434 targets = bond->params.arp_targets;
2435 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2436 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2437 "%u.%u.%u.%u bhti(tip) %d\n",
2438 NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2439 bond_has_this_ip(bond, tip));
2440 if (sip == targets[i]) {
2441 if (bond_has_this_ip(bond, tip))
2442 slave->last_arp_rx = jiffies;
2443 return;
2444 }
2445 }
2446}
2447
2448static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2449{
2450 struct arphdr *arp;
2451 struct slave *slave;
2452 struct bonding *bond;
2453 unsigned char *arp_ptr;
2454 u32 sip, tip;
2455
e730c155
EB		 2456 if (dev->nd_net != &init_net)
2457 goto out;
2458
f5b2b966
JV		 2459 if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2460 goto out;
2461
2462 bond = dev->priv;
2463 read_lock(&bond->lock);
2464
2465 dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2466 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2467 orig_dev ? orig_dev->name : "NULL");
2468
2469 slave = bond_get_slave_by_dev(bond, orig_dev);
2470 if (!slave || !slave_do_arp_validate(bond, slave))
2471 goto out_unlock;
2472
2473 /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
2474 if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2475 (2 * dev->addr_len) +
2476 (2 * sizeof(u32)))))
2477 goto out_unlock;
2478
d0a92be0 2479 arp = arp_hdr(skb);
f5b2b966
JV		 2480 if (arp->ar_hln != dev->addr_len ||
2481 skb->pkt_type == PACKET_OTHERHOST ||
2482 skb->pkt_type == PACKET_LOOPBACK ||
2483 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2484 arp->ar_pro != htons(ETH_P_IP) ||
2485 arp->ar_pln != 4)
2486 goto out_unlock;
2487
2488 arp_ptr = (unsigned char *)(arp + 1);
2489 arp_ptr += dev->addr_len;
2490 memcpy(&sip, arp_ptr, 4);
2491 arp_ptr += 4 + dev->addr_len;
2492 memcpy(&tip, arp_ptr, 4);
2493
2494 dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2495 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2496 slave->state, bond->params.arp_validate,
2497 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2498
2499 /*
2500 * Backup slaves won't see the ARP reply, but do come through
2501 * here for each ARP probe (so we swap the sip/tip to validate
2502 * the probe). In a "redundant switch, common router" type of
2503 * configuration, the ARP probe will (hopefully) travel from
2504 * the active, through one switch, the router, then the other
2505 * switch before reaching the backup.
2506 */
2507 if (slave->state == BOND_STATE_ACTIVE)
2508 bond_validate_arp(bond, slave, sip, tip);
2509 else
2510 bond_validate_arp(bond, slave, tip, sip);
2511
2512out_unlock:
2513 read_unlock(&bond->lock);
2514out:
2515 dev_kfree_skb(skb);
2516 return NET_RX_SUCCESS;
2517}
2518
1da177e4
LT		 2519/*
2520 * this function is called regularly to monitor each slave's link
2521 * ensuring that traffic is being sent and received when arp monitoring
2522 * is used in load-balancing mode. if the adapter has been dormant, then an
2523 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2524 * arp monitoring in active backup mode.
2525 */
a77b5325 2526void bond_loadbalance_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2527{
2528 struct bonding *bond = bond_dev->priv;
2529 struct slave *slave, *oldcurrent;
2530 int do_failover = 0;
2531 int delta_in_ticks;
2532 int i;
2533
2534 read_lock(&bond->lock);
2535
2536 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2537
2538 if (bond->kill_timers) {
2539 goto out;
2540 }
2541
2542 if (bond->slave_cnt == 0) {
2543 goto re_arm;
2544 }
2545
2546 read_lock(&bond->curr_slave_lock);
2547 oldcurrent = bond->curr_active_slave;
2548 read_unlock(&bond->curr_slave_lock);
2549
2550 /* see if any of the previous devices are up now (i.e. they have
2551 * xmt and rcv traffic). the curr_active_slave does not come into
2552 * the picture unless it is null. also, slave->jiffies is not needed
2553 * here because we send an arp on each slave and give a slave as
2554 * long as it needs to get the tx/rx within the delta.
2555 * TODO: what about up/down delay in arp mode? it wasn't here before
2556 * so it can wait
2557 */
2558 bond_for_each_slave(bond, slave, i) {
2559 if (slave->link != BOND_LINK_UP) {
2560 if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2561 ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2562
2563 slave->link = BOND_LINK_UP;
2564 slave->state = BOND_STATE_ACTIVE;
2565
2566 /* primary_slave has no meaning in round-robin
2567 * mode. the window of a slave being up and
2568 * curr_active_slave being null after enslaving
2569 * is closed.
2570 */
2571 if (!oldcurrent) {
2572 printk(KERN_INFO DRV_NAME
2573 ": %s: link status definitely "
2574 "up for interface %s, ",
2575 bond_dev->name,
2576 slave->dev->name);
2577 do_failover = 1;
2578 } else {
2579 printk(KERN_INFO DRV_NAME
2580 ": %s: interface %s is now up\n",
2581 bond_dev->name,
2582 slave->dev->name);
2583 }
2584 }
2585 } else {
2586 /* slave->link == BOND_LINK_UP */
2587
2588 /* not all switches will respond to an arp request
2589 * when the source ip is 0, so don't take the link down
2590 * if we don't know our ip yet
2591 */
2592 if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2593 (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
c3ade5ca 2594 bond_has_ip(bond))) {
1da177e4
LT		 2595
2596 slave->link = BOND_LINK_DOWN;
2597 slave->state = BOND_STATE_BACKUP;
2598
2599 if (slave->link_failure_count < UINT_MAX) {
2600 slave->link_failure_count++;
2601 }
2602
2603 printk(KERN_INFO DRV_NAME
2604 ": %s: interface %s is now down.\n",
2605 bond_dev->name,
2606 slave->dev->name);
2607
2608 if (slave == oldcurrent) {
2609 do_failover = 1;
2610 }
2611 }
2612 }
2613
2614 /* note: if switch is in round-robin mode, all links
2615 * must tx arp to ensure all links rx an arp - otherwise
2616 * links may oscillate or not come up at all; if switch is
2617 * in something like xor mode, there is nothing we can
2618 * do - all replies will be rx'ed on same link causing slaves
2619 * to be unstable during low/no traffic periods
2620 */
2621 if (IS_UP(slave->dev)) {
2622 bond_arp_send_all(bond, slave);
2623 }
2624 }
2625
2626 if (do_failover) {
2627 write_lock(&bond->curr_slave_lock);
2628
2629 bond_select_active_slave(bond);
2630
1da177e4
LT		 2631 write_unlock(&bond->curr_slave_lock);
2632 }
2633
2634re_arm:
2635 if (bond->params.arp_interval) {
2636 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2637 }
2638out:
2639 read_unlock(&bond->lock);
2640}
2641
2642/*
2643 * When using arp monitoring in active-backup mode, this function is
2644 * called to determine if any backup slaves have went down or a new
2645 * current slave needs to be found.
2646 * The backup slaves never generate traffic, they are considered up by merely
2647 * receiving traffic. If the current slave goes down, each backup slave will
2648 * be given the opportunity to tx/rx an arp before being taken down - this
2649 * prevents all slaves from being taken down due to the current slave not
2650 * sending any traffic for the backups to receive. The arps are not necessarily
2651 * necessary, any tx and rx traffic will keep the current slave up. While any
2652 * rx traffic will keep the backup slaves up, the current slave is responsible
2653 * for generating traffic to keep them up regardless of any other traffic they
2654 * may have received.
2655 * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2656 */
a77b5325 2657void bond_activebackup_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2658{
2659 struct bonding *bond = bond_dev->priv;
2660 struct slave *slave;
2661 int delta_in_ticks;
2662 int i;
2663
2664 read_lock(&bond->lock);
2665
2666 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2667
2668 if (bond->kill_timers) {
2669 goto out;
2670 }
2671
2672 if (bond->slave_cnt == 0) {
2673 goto re_arm;
2674 }
2675
2676 /* determine if any slave has come up or any backup slave has
2677 * gone down
2678 * TODO: what about up/down delay in arp mode? it wasn't here before
2679 * so it can wait
2680 */
2681 bond_for_each_slave(bond, slave, i) {
2682 if (slave->link != BOND_LINK_UP) {
f5b2b966
JV		 2683 if ((jiffies - slave_last_rx(bond, slave)) <=
2684 delta_in_ticks) {
1da177e4
LT		 2685
2686 slave->link = BOND_LINK_UP;
2687
2688 write_lock(&bond->curr_slave_lock);
2689
2690 if ((!bond->curr_active_slave) &&
2691 ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2692 bond_change_active_slave(bond, slave);
2693 bond->current_arp_slave = NULL;
2694 } else if (bond->curr_active_slave != slave) {
2695 /* this slave has just come up but we
2696 * already have a current slave; this
2697 * can also happen if bond_enslave adds
2698 * a new slave that is up while we are
2699 * searching for a new slave
2700 */
2701 bond_set_slave_inactive_flags(slave);
2702 bond->current_arp_slave = NULL;
2703 }
2704
ff59c456
JV		 2705 bond_set_carrier(bond);
2706
1da177e4
LT		 2707 if (slave == bond->curr_active_slave) {
2708 printk(KERN_INFO DRV_NAME
2709 ": %s: %s is up and now the "
2710 "active interface\n",
2711 bond_dev->name,
2712 slave->dev->name);
ff59c456 2713 netif_carrier_on(bond->dev);
1da177e4
LT		 2714 } else {
2715 printk(KERN_INFO DRV_NAME
2716 ": %s: backup interface %s is "
2717 "now up\n",
2718 bond_dev->name,
2719 slave->dev->name);
2720 }
2721
2722 write_unlock(&bond->curr_slave_lock);
2723 }
2724 } else {
2725 read_lock(&bond->curr_slave_lock);
2726
2727 if ((slave != bond->curr_active_slave) &&
2728 (!bond->current_arp_slave) &&
f5b2b966 2729 (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
c3ade5ca 2730 bond_has_ip(bond))) {
1da177e4
LT		 2731 /* a backup slave has gone down; three times
2732 * the delta allows the current slave to be
2733 * taken out before the backup slave.
2734 * note: a non-null current_arp_slave indicates
2735 * the curr_active_slave went down and we are
2736 * searching for a new one; under this
2737 * condition we only take the curr_active_slave
2738 * down - this gives each slave a chance to
2739 * tx/rx traffic before being taken out
2740 */
2741
2742 read_unlock(&bond->curr_slave_lock);
2743
2744 slave->link = BOND_LINK_DOWN;
2745
2746 if (slave->link_failure_count < UINT_MAX) {
2747 slave->link_failure_count++;
2748 }
2749
2750 bond_set_slave_inactive_flags(slave);
2751
2752 printk(KERN_INFO DRV_NAME
2753 ": %s: backup interface %s is now down\n",
2754 bond_dev->name,
2755 slave->dev->name);
2756 } else {
2757 read_unlock(&bond->curr_slave_lock);
2758 }
2759 }
2760 }
2761
2762 read_lock(&bond->curr_slave_lock);
2763 slave = bond->curr_active_slave;
2764 read_unlock(&bond->curr_slave_lock);
2765
2766 if (slave) {
2767 /* if we have sent traffic in the past 2*arp_intervals but
2768 * haven't xmit and rx traffic in that time interval, select
2769 * a different slave. slave->jiffies is only updated when
2770 * a slave first becomes the curr_active_slave - not necessarily
2771 * after every arp; this ensures the slave has a full 2*delta
2772 * before being taken out. if a primary is being used, check
2773 * if it is up and needs to take over as the curr_active_slave
2774 */
2775 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
f5b2b966 2776 (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
c3ade5ca 2777 bond_has_ip(bond))) &&
1da177e4
LT		 2778 ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2779
2780 slave->link = BOND_LINK_DOWN;
2781
2782 if (slave->link_failure_count < UINT_MAX) {
2783 slave->link_failure_count++;
2784 }
2785
2786 printk(KERN_INFO DRV_NAME
2787 ": %s: link status down for active interface "
2788 "%s, disabling it\n",
2789 bond_dev->name,
2790 slave->dev->name);
2791
2792 write_lock(&bond->curr_slave_lock);
2793
2794 bond_select_active_slave(bond);
2795 slave = bond->curr_active_slave;
2796
2797 write_unlock(&bond->curr_slave_lock);
2798
2799 bond->current_arp_slave = slave;
2800
2801 if (slave) {
2802 slave->jiffies = jiffies;
2803 }
2804 } else if ((bond->primary_slave) &&
2805 (bond->primary_slave != slave) &&
2806 (bond->primary_slave->link == BOND_LINK_UP)) {
2807 /* at this point, slave is the curr_active_slave */
2808 printk(KERN_INFO DRV_NAME
2809 ": %s: changing from interface %s to primary "
2810 "interface %s\n",
2811 bond_dev->name,
2812 slave->dev->name,
2813 bond->primary_slave->dev->name);
2814
2815 /* primary is up so switch to it */
2816 write_lock(&bond->curr_slave_lock);
2817 bond_change_active_slave(bond, bond->primary_slave);
2818 write_unlock(&bond->curr_slave_lock);
2819
2820 slave = bond->primary_slave;
2821 slave->jiffies = jiffies;
2822 } else {
2823 bond->current_arp_slave = NULL;
2824 }
2825
2826 /* the current slave must tx an arp to ensure backup slaves
2827 * rx traffic
2828 */
c3ade5ca 2829 if (slave && bond_has_ip(bond)) {
1da177e4
LT		 2830 bond_arp_send_all(bond, slave);
2831 }
2832 }
2833
2834 /* if we don't have a curr_active_slave, search for the next available
2835 * backup slave from the current_arp_slave and make it the candidate
2836 * for becoming the curr_active_slave
2837 */
2838 if (!slave) {
2839 if (!bond->current_arp_slave) {
2840 bond->current_arp_slave = bond->first_slave;
2841 }
2842
2843 if (bond->current_arp_slave) {
2844 bond_set_slave_inactive_flags(bond->current_arp_slave);
2845
2846 /* search for next candidate */
2f872f04 2847 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
1da177e4
LT		 2848 if (IS_UP(slave->dev)) {
2849 slave->link = BOND_LINK_BACK;
2850 bond_set_slave_active_flags(slave);
2851 bond_arp_send_all(bond, slave);
2852 slave->jiffies = jiffies;
2853 bond->current_arp_slave = slave;
2854 break;
2855 }
2856
2857 /* if the link state is up at this point, we
2858 * mark it down - this can happen if we have
2859 * simultaneous link failures and
2860 * reselect_active_interface doesn't make this
2861 * one the current slave so it is still marked
2862 * up when it is actually down
2863 */
2864 if (slave->link == BOND_LINK_UP) {
2865 slave->link = BOND_LINK_DOWN;
2866 if (slave->link_failure_count < UINT_MAX) {
2867 slave->link_failure_count++;
2868 }
2869
2870 bond_set_slave_inactive_flags(slave);
2871
2872 printk(KERN_INFO DRV_NAME
2873 ": %s: backup interface %s is "
2874 "now down.\n",
2875 bond_dev->name,
2876 slave->dev->name);
2877 }
2878 }
2879 }
2880 }
2881
2882re_arm:
2883 if (bond->params.arp_interval) {
2884 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2885 }
2886out:
2887 read_unlock(&bond->lock);
2888}
2889
2890/*------------------------------ proc/seq_file-------------------------------*/
2891
2892#ifdef CONFIG_PROC_FS
2893
2894#define SEQ_START_TOKEN ((void *)1)
2895
2896static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2897{
2898 struct bonding *bond = seq->private;
2899 loff_t off = 0;
2900 struct slave *slave;
2901 int i;
2902
2903 /* make sure the bond won't be taken away */
2904 read_lock(&dev_base_lock);
2905 read_lock_bh(&bond->lock);
2906
2907 if (*pos == 0) {
2908 return SEQ_START_TOKEN;
2909 }
2910
2911 bond_for_each_slave(bond, slave, i) {
2912 if (++off == *pos) {
2913 return slave;
2914 }
2915 }
2916
2917 return NULL;
2918}
2919
2920static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2921{
2922 struct bonding *bond = seq->private;
2923 struct slave *slave = v;
2924
2925 ++*pos;
2926 if (v == SEQ_START_TOKEN) {
2927 return bond->first_slave;
2928 }
2929
2930 slave = slave->next;
2931
2932 return (slave == bond->first_slave) ? NULL : slave;
2933}
2934
2935static void bond_info_seq_stop(struct seq_file *seq, void *v)
2936{
2937 struct bonding *bond = seq->private;
2938
2939 read_unlock_bh(&bond->lock);
2940 read_unlock(&dev_base_lock);
2941}
2942
2943static void bond_info_show_master(struct seq_file *seq)
2944{
2945 struct bonding *bond = seq->private;
2946 struct slave *curr;
4756b02f
MW		 2947 int i;
2948 u32 target;
1da177e4
LT		 2949
2950 read_lock(&bond->curr_slave_lock);
2951 curr = bond->curr_active_slave;
2952 read_unlock(&bond->curr_slave_lock);
2953
2954 seq_printf(seq, "Bonding Mode: %s\n",
2955 bond_mode_name(bond->params.mode));
2956
c61b75ad
MW		 2957 if (bond->params.mode == BOND_MODE_XOR ||
2958 bond->params.mode == BOND_MODE_8023AD) {
2959 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2960 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2961 bond->params.xmit_policy);
2962 }
2963
1da177e4
LT		 2964 if (USES_PRIMARY(bond->params.mode)) {
2965 seq_printf(seq, "Primary Slave: %s\n",
0f418b2a
MW		 2966 (bond->primary_slave) ?
2967 bond->primary_slave->dev->name : "None");
1da177e4
LT		 2968
2969 seq_printf(seq, "Currently Active Slave: %s\n",
2970 (curr) ? curr->dev->name : "None");
2971 }
2972
ff59c456
JV		 2973 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2974 "up" : "down");
1da177e4
LT		 2975 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2976 seq_printf(seq, "Up Delay (ms): %d\n",
2977 bond->params.updelay * bond->params.miimon);
2978 seq_printf(seq, "Down Delay (ms): %d\n",
2979 bond->params.downdelay * bond->params.miimon);
2980
4756b02f
MW		 2981
2982 /* ARP information */
2983 if(bond->params.arp_interval > 0) {
2984 int printed=0;
2985 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2986 bond->params.arp_interval);
2987
2988 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2989
2990 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2991 if (!bond->params.arp_targets[i])
2992 continue;
2993 if (printed)
2994 seq_printf(seq, ",");
2995 target = ntohl(bond->params.arp_targets[i]);
2996 seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
2997 printed = 1;
2998 }
2999 seq_printf(seq, "\n");
3000 }
3001
1da177e4
LT		 3002 if (bond->params.mode == BOND_MODE_8023AD) {
3003 struct ad_info ad_info;
0795af57 3004 DECLARE_MAC_BUF(mac);
1da177e4
LT		 3005
3006 seq_puts(seq, "\n802.3ad info\n");
3007 seq_printf(seq, "LACP rate: %s\n",
3008 (bond->params.lacp_fast) ? "fast" : "slow");
3009
3010 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3011 seq_printf(seq, "bond %s has no active aggregator\n",
3012 bond->dev->name);
3013 } else {
3014 seq_printf(seq, "Active Aggregator Info:\n");
3015
3016 seq_printf(seq, "\tAggregator ID: %d\n",
3017 ad_info.aggregator_id);
3018 seq_printf(seq, "\tNumber of ports: %d\n",
3019 ad_info.ports);
3020 seq_printf(seq, "\tActor Key: %d\n",
3021 ad_info.actor_key);
3022 seq_printf(seq, "\tPartner Key: %d\n",
3023 ad_info.partner_key);
0795af57
JP		 3024 seq_printf(seq, "\tPartner Mac Address: %s\n",
3025 print_mac(mac, ad_info.partner_system));
1da177e4
LT		 3026 }
3027 }
3028}
3029
3030static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3031{
3032 struct bonding *bond = seq->private;
0795af57 3033 DECLARE_MAC_BUF(mac);
1da177e4
LT		 3034
3035 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3036 seq_printf(seq, "MII Status: %s\n",
3037 (slave->link == BOND_LINK_UP) ? "up" : "down");
65509645 3038 seq_printf(seq, "Link Failure Count: %u\n",
1da177e4
LT		 3039 slave->link_failure_count);
3040
217df670 3041 seq_printf(seq,
0795af57
JP		 3042 "Permanent HW addr: %s\n",
3043 print_mac(mac, slave->perm_hwaddr));
1da177e4
LT		 3044
3045 if (bond->params.mode == BOND_MODE_8023AD) {
3046 const struct aggregator *agg
3047 = SLAVE_AD_INFO(slave).port.aggregator;
3048
3049 if (agg) {
3050 seq_printf(seq, "Aggregator ID: %d\n",
3051 agg->aggregator_identifier);
3052 } else {
3053 seq_puts(seq, "Aggregator ID: N/A\n");
3054 }
3055 }
3056}
3057
3058static int bond_info_seq_show(struct seq_file *seq, void *v)
3059{
3060 if (v == SEQ_START_TOKEN) {
3061 seq_printf(seq, "%s\n", version);
3062 bond_info_show_master(seq);
3063 } else {
3064 bond_info_show_slave(seq, v);
3065 }
3066
3067 return 0;
3068}
3069
3070static struct seq_operations bond_info_seq_ops = {
3071 .start = bond_info_seq_start,
3072 .next = bond_info_seq_next,
3073 .stop = bond_info_seq_stop,
3074 .show = bond_info_seq_show,
3075};
3076
3077static int bond_info_open(struct inode *inode, struct file *file)
3078{
3079 struct seq_file *seq;
3080 struct proc_dir_entry *proc;
3081 int res;
3082
3083 res = seq_open(file, &bond_info_seq_ops);
3084 if (!res) {
3085 /* recover the pointer buried in proc_dir_entry data */
3086 seq = file->private_data;
3087 proc = PDE(inode);
3088 seq->private = proc->data;
3089 }
3090
3091 return res;
3092}
3093
d54b1fdb 3094static const struct file_operations bond_info_fops = {
1da177e4
LT		 3095 .owner = THIS_MODULE,
3096 .open = bond_info_open,
3097 .read = seq_read,
3098 .llseek = seq_lseek,
3099 .release = seq_release,
3100};
3101
3102static int bond_create_proc_entry(struct bonding *bond)
3103{
3104 struct net_device *bond_dev = bond->dev;
3105
3106 if (bond_proc_dir) {
3107 bond->proc_entry = create_proc_entry(bond_dev->name,
3108 S_IRUGO,
3109 bond_proc_dir);
3110 if (bond->proc_entry == NULL) {
3111 printk(KERN_WARNING DRV_NAME
3112 ": Warning: Cannot create /proc/net/%s/%s\n",
3113 DRV_NAME, bond_dev->name);
3114 } else {
3115 bond->proc_entry->data = bond;
3116 bond->proc_entry->proc_fops = &bond_info_fops;
3117 bond->proc_entry->owner = THIS_MODULE;
3118 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3119 }
3120 }
3121
3122 return 0;
3123}
3124
3125static void bond_remove_proc_entry(struct bonding *bond)
3126{
3127 if (bond_proc_dir && bond->proc_entry) {
3128 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3129 memset(bond->proc_file_name, 0, IFNAMSIZ);
3130 bond->proc_entry = NULL;
3131 }
3132}
3133
3134/* Create the bonding directory under /proc/net, if doesn't exist yet.
3135 * Caller must hold rtnl_lock.
3136 */
3137static void bond_create_proc_dir(void)
3138{
3139 int len = strlen(DRV_NAME);
3140
457c4cbc 3141 for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
1da177e4
LT		 3142 bond_proc_dir = bond_proc_dir->next) {
3143 if ((bond_proc_dir->namelen == len) &&
3144 !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3145 break;
3146 }
3147 }
3148
3149 if (!bond_proc_dir) {
457c4cbc 3150 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
1da177e4
LT		 3151 if (bond_proc_dir) {
3152 bond_proc_dir->owner = THIS_MODULE;
3153 } else {
3154 printk(KERN_WARNING DRV_NAME
3155 ": Warning: cannot create /proc/net/%s\n",
3156 DRV_NAME);
3157 }
3158 }
3159}
3160
3161/* Destroy the bonding directory under /proc/net, if empty.
3162 * Caller must hold rtnl_lock.
3163 */
3164static void bond_destroy_proc_dir(void)
3165{
3166 struct proc_dir_entry *de;
3167
3168 if (!bond_proc_dir) {
3169 return;
3170 }
3171
3172 /* verify that the /proc dir is empty */
3173 for (de = bond_proc_dir->subdir; de; de = de->next) {
3174 /* ignore . and .. */
3175 if (*(de->name) != '.') {
3176 break;
3177 }
3178 }
3179
3180 if (de) {
3181 if (bond_proc_dir->owner == THIS_MODULE) {
3182 bond_proc_dir->owner = NULL;
3183 }
3184 } else {
457c4cbc 3185 remove_proc_entry(DRV_NAME, init_net.proc_net);
1da177e4
LT		 3186 bond_proc_dir = NULL;
3187 }
3188}
3189#endif /* CONFIG_PROC_FS */
3190
3191/*-------------------------- netdev event handling --------------------------*/
3192
3193/*
3194 * Change device name
3195 */
3196static int bond_event_changename(struct bonding *bond)
3197{
3198#ifdef CONFIG_PROC_FS
3199 bond_remove_proc_entry(bond);
3200 bond_create_proc_entry(bond);
3201#endif
b76cdba9
MW		 3202 down_write(&(bonding_rwsem));
3203 bond_destroy_sysfs_entry(bond);
3204 bond_create_sysfs_entry(bond);
3205 up_write(&(bonding_rwsem));
1da177e4
LT		 3206 return NOTIFY_DONE;
3207}
3208
3209static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3210{
3211 struct bonding *event_bond = bond_dev->priv;
3212
3213 switch (event) {
3214 case NETDEV_CHANGENAME:
3215 return bond_event_changename(event_bond);
3216 case NETDEV_UNREGISTER:
3217 /*
3218 * TODO: remove a bond from the list?
3219 */
3220 break;
3221 default:
3222 break;
3223 }
3224
3225 return NOTIFY_DONE;
3226}
3227
3228static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3229{
3230 struct net_device *bond_dev = slave_dev->master;
8531c5ff 3231 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3232
3233 switch (event) {
3234 case NETDEV_UNREGISTER:
3235 if (bond_dev) {
3236 bond_release(bond_dev, slave_dev);
3237 }
3238 break;
3239 case NETDEV_CHANGE:
3240 /*
3241 * TODO: is this what we get if somebody
3242 * sets up a hierarchical bond, then rmmod's
3243 * one of the slave bonding devices?
3244 */
3245 break;
3246 case NETDEV_DOWN:
3247 /*
3248 * ... Or is it this?
3249 */
3250 break;
3251 case NETDEV_CHANGEMTU:
3252 /*
3253 * TODO: Should slaves be allowed to
3254 * independently alter their MTU? For
3255 * an active-backup bond, slaves need
3256 * not be the same type of device, so
3257 * MTUs may vary. For other modes,
3258 * slaves arguably should have the
3259 * same MTUs. To do this, we'd need to
3260 * take over the slave's change_mtu
3261 * function for the duration of their
3262 * servitude.
3263 */
3264 break;
3265 case NETDEV_CHANGENAME:
3266 /*
3267 * TODO: handle changing the primary's name
3268 */
3269 break;
8531c5ff
AK		 3270 case NETDEV_FEAT_CHANGE:
3271 bond_compute_features(bond);
3272 break;
1da177e4
LT		 3273 default:
3274 break;
3275 }
3276
3277 return NOTIFY_DONE;
3278}
3279
3280/*
3281 * bond_netdev_event: handle netdev notifier chain events.
3282 *
3283 * This function receives events for the netdev chain. The caller (an
e041c683 3284 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
1da177e4
LT		 3285 * locks for us to safely manipulate the slave devices (RTNL lock,
3286 * dev_probe_lock).
3287 */
3288static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3289{
3290 struct net_device *event_dev = (struct net_device *)ptr;
3291
e9dc8653
EB		 3292 if (event_dev->nd_net != &init_net)
3293 return NOTIFY_DONE;
3294
1da177e4
LT		 3295 dprintk("event_dev: %s, event: %lx\n",
3296 (event_dev ? event_dev->name : "None"),
3297 event);
3298
0b680e75
JV		 3299 if (!(event_dev->priv_flags & IFF_BONDING))
3300 return NOTIFY_DONE;
3301
1da177e4
LT		 3302 if (event_dev->flags & IFF_MASTER) {
3303 dprintk("IFF_MASTER\n");
3304 return bond_master_netdev_event(event, event_dev);
3305 }
3306
3307 if (event_dev->flags & IFF_SLAVE) {
3308 dprintk("IFF_SLAVE\n");
3309 return bond_slave_netdev_event(event, event_dev);
3310 }
3311
3312 return NOTIFY_DONE;
3313}
3314
c3ade5ca
JV		 3315/*
3316 * bond_inetaddr_event: handle inetaddr notifier chain events.
3317 *
3318 * We keep track of device IPs primarily to use as source addresses in
3319 * ARP monitor probes (rather than spewing out broadcasts all the time).
3320 *
3321 * We track one IP for the main device (if it has one), plus one per VLAN.
3322 */
3323static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3324{
3325 struct in_ifaddr *ifa = ptr;
3326 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3327 struct bonding *bond, *bond_next;
3328 struct vlan_entry *vlan, *vlan_next;
3329
3330 list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3331 if (bond->dev == event_dev) {
3332 switch (event) {
3333 case NETDEV_UP:
3334 bond->master_ip = ifa->ifa_local;
3335 return NOTIFY_OK;
3336 case NETDEV_DOWN:
3337 bond->master_ip = bond_glean_dev_ip(bond->dev);
3338 return NOTIFY_OK;
3339 default:
3340 return NOTIFY_DONE;
3341 }
3342 }
3343
3344 if (list_empty(&bond->vlan_list))
3345 continue;
3346
3347 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3348 vlan_list) {
5c15bdec 3349 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 3350 if (vlan_dev == event_dev) {
3351 switch (event) {
3352 case NETDEV_UP:
3353 vlan->vlan_ip = ifa->ifa_local;
3354 return NOTIFY_OK;
3355 case NETDEV_DOWN:
3356 vlan->vlan_ip =
3357 bond_glean_dev_ip(vlan_dev);
3358 return NOTIFY_OK;
3359 default:
3360 return NOTIFY_DONE;
3361 }
3362 }
3363 }
3364 }
3365 return NOTIFY_DONE;
3366}
3367
1da177e4
LT		 3368static struct notifier_block bond_netdev_notifier = {
3369 .notifier_call = bond_netdev_event,
3370};
3371
c3ade5ca
JV		 3372static struct notifier_block bond_inetaddr_notifier = {
3373 .notifier_call = bond_inetaddr_event,
3374};
3375
1da177e4
LT		 3376/*-------------------------- Packet type handling ---------------------------*/
3377
3378/* register to receive lacpdus on a bond */
3379static void bond_register_lacpdu(struct bonding *bond)
3380{
3381 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3382
3383 /* initialize packet type */
3384 pk_type->type = PKT_TYPE_LACPDU;
3385 pk_type->dev = bond->dev;
3386 pk_type->func = bond_3ad_lacpdu_recv;
3387
3388 dev_add_pack(pk_type);
3389}
3390
3391/* unregister to receive lacpdus on a bond */
3392static void bond_unregister_lacpdu(struct bonding *bond)
3393{
3394 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3395}
3396
f5b2b966
JV		 3397void bond_register_arp(struct bonding *bond)
3398{
3399 struct packet_type *pt = &bond->arp_mon_pt;
3400
c4f283b1
JV		 3401 if (pt->type)
3402 return;
3403
f5b2b966 3404 pt->type = htons(ETH_P_ARP);
e245cb71 3405 pt->dev = bond->dev;
f5b2b966
JV		 3406 pt->func = bond_arp_rcv;
3407 dev_add_pack(pt);
3408}
3409
3410void bond_unregister_arp(struct bonding *bond)
3411{
c4f283b1
JV		 3412 struct packet_type *pt = &bond->arp_mon_pt;
3413
3414 dev_remove_pack(pt);
3415 pt->type = 0;
f5b2b966
JV		 3416}
3417
169a3e66
JV		 3418/*---------------------------- Hashing Policies -----------------------------*/
3419
3420/*
59c51591 3421 * Hash for the output device based upon layer 3 and layer 4 data. If
169a3e66
JV		 3422 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3423 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3424 */
3425static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3426 struct net_device *bond_dev, int count)
3427{
3428 struct ethhdr *data = (struct ethhdr *)skb->data;
eddc9ec5 3429 struct iphdr *iph = ip_hdr(skb);
169a3e66
JV		 3430 u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3431 int layer4_xor = 0;
3432
3433 if (skb->protocol == __constant_htons(ETH_P_IP)) {
3434 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3435 (iph->protocol == IPPROTO_TCP ||
3436 iph->protocol == IPPROTO_UDP)) {
3437 layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3438 }
3439 return (layer4_xor ^
3440 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3441
3442 }
3443
3444 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3445}
3446
3447/*
3448 * Hash for the output device based upon layer 2 data
3449 */
3450static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3451 struct net_device *bond_dev, int count)
3452{
3453 struct ethhdr *data = (struct ethhdr *)skb->data;
3454
3455 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3456}
3457
1da177e4
LT		 3458/*-------------------------- Device entry points ----------------------------*/
3459
3460static int bond_open(struct net_device *bond_dev)
3461{
3462 struct bonding *bond = bond_dev->priv;
3463 struct timer_list *mii_timer = &bond->mii_timer;
3464 struct timer_list *arp_timer = &bond->arp_timer;
3465
3466 bond->kill_timers = 0;
3467
3468 if ((bond->params.mode == BOND_MODE_TLB) ||
3469 (bond->params.mode == BOND_MODE_ALB)) {
3470 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3471
3472 /* bond_alb_initialize must be called before the timer
3473 * is started.
3474 */
3475 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3476 /* something went wrong - fail the open operation */
3477 return -1;
3478 }
3479
3480 init_timer(alb_timer);
3481 alb_timer->expires = jiffies + 1;
3482 alb_timer->data = (unsigned long)bond;
3483 alb_timer->function = (void *)&bond_alb_monitor;
3484 add_timer(alb_timer);
3485 }
3486
3487 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3488 init_timer(mii_timer);
3489 mii_timer->expires = jiffies + 1;
3490 mii_timer->data = (unsigned long)bond_dev;
3491 mii_timer->function = (void *)&bond_mii_monitor;
3492 add_timer(mii_timer);
3493 }
3494
3495 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3496 init_timer(arp_timer);
3497 arp_timer->expires = jiffies + 1;
3498 arp_timer->data = (unsigned long)bond_dev;
3499 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3500 arp_timer->function = (void *)&bond_activebackup_arp_mon;
3501 } else {
3502 arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3503 }
f5b2b966
JV		 3504 if (bond->params.arp_validate)
3505 bond_register_arp(bond);
3506
1da177e4
LT		 3507 add_timer(arp_timer);
3508 }
3509
3510 if (bond->params.mode == BOND_MODE_8023AD) {
3511 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3512 init_timer(ad_timer);
3513 ad_timer->expires = jiffies + 1;
3514 ad_timer->data = (unsigned long)bond;
3515 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3516 add_timer(ad_timer);
3517
3518 /* register to receive LACPDUs */
3519 bond_register_lacpdu(bond);
3520 }
3521
3522 return 0;
3523}
3524
3525static int bond_close(struct net_device *bond_dev)
3526{
3527 struct bonding *bond = bond_dev->priv;
3528
3529 if (bond->params.mode == BOND_MODE_8023AD) {
3530 /* Unregister the receive of LACPDUs */
3531 bond_unregister_lacpdu(bond);
3532 }
3533
f5b2b966
JV		 3534 if (bond->params.arp_validate)
3535 bond_unregister_arp(bond);
3536
1da177e4
LT		 3537 write_lock_bh(&bond->lock);
3538
1da177e4
LT		 3539
3540 /* signal timers not to re-arm */
3541 bond->kill_timers = 1;
3542
3543 write_unlock_bh(&bond->lock);
3544
3545 /* del_timer_sync must run without holding the bond->lock
3546 * because a running timer might be trying to hold it too
3547 */
3548
3549 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3550 del_timer_sync(&bond->mii_timer);
3551 }
3552
3553 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3554 del_timer_sync(&bond->arp_timer);
3555 }
3556
3557 switch (bond->params.mode) {
3558 case BOND_MODE_8023AD:
3559 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3560 break;
3561 case BOND_MODE_TLB:
3562 case BOND_MODE_ALB:
3563 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3564 break;
3565 default:
3566 break;
3567 }
3568
1da177e4
LT		 3569
3570 if ((bond->params.mode == BOND_MODE_TLB) ||
3571 (bond->params.mode == BOND_MODE_ALB)) {
3572 /* Must be called only after all
3573 * slaves have been released
3574 */
3575 bond_alb_deinitialize(bond);
3576 }
3577
3578 return 0;
3579}
3580
3581static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3582{
3583 struct bonding *bond = bond_dev->priv;
3584 struct net_device_stats *stats = &(bond->stats), *sstats;
3585 struct slave *slave;
3586 int i;
3587
3588 memset(stats, 0, sizeof(struct net_device_stats));
3589
3590 read_lock_bh(&bond->lock);
3591
3592 bond_for_each_slave(bond, slave, i) {
c45d286e 3593 sstats = slave->dev->get_stats(slave->dev);
5a1b5898
RR		 3594 stats->rx_packets += sstats->rx_packets;
3595 stats->rx_bytes += sstats->rx_bytes;
3596 stats->rx_errors += sstats->rx_errors;
3597 stats->rx_dropped += sstats->rx_dropped;
3598
3599 stats->tx_packets += sstats->tx_packets;
3600 stats->tx_bytes += sstats->tx_bytes;
3601 stats->tx_errors += sstats->tx_errors;
3602 stats->tx_dropped += sstats->tx_dropped;
3603
3604 stats->multicast += sstats->multicast;
3605 stats->collisions += sstats->collisions;
3606
3607 stats->rx_length_errors += sstats->rx_length_errors;
3608 stats->rx_over_errors += sstats->rx_over_errors;
3609 stats->rx_crc_errors += sstats->rx_crc_errors;
3610 stats->rx_frame_errors += sstats->rx_frame_errors;
3611 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3612 stats->rx_missed_errors += sstats->rx_missed_errors;
3613
3614 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3615 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3616 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3617 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3618 stats->tx_window_errors += sstats->tx_window_errors;
1da177e4
LT		 3619 }
3620
3621 read_unlock_bh(&bond->lock);
3622
3623 return stats;
3624}
3625
3626static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3627{
3628 struct net_device *slave_dev = NULL;
3629 struct ifbond k_binfo;
3630 struct ifbond __user *u_binfo = NULL;
3631 struct ifslave k_sinfo;
3632 struct ifslave __user *u_sinfo = NULL;
3633 struct mii_ioctl_data *mii = NULL;
1da177e4
LT		 3634 int res = 0;
3635
3636 dprintk("bond_ioctl: master=%s, cmd=%d\n",
3637 bond_dev->name, cmd);
3638
3639 switch (cmd) {
1da177e4
LT		 3640 case SIOCGMIIPHY:
3641 mii = if_mii(ifr);
3642 if (!mii) {
3643 return -EINVAL;
3644 }
3645 mii->phy_id = 0;
3646 /* Fall Through */
3647 case SIOCGMIIREG:
3648 /*
3649 * We do this again just in case we were called by SIOCGMIIREG
3650 * instead of SIOCGMIIPHY.
3651 */
3652 mii = if_mii(ifr);
3653 if (!mii) {
3654 return -EINVAL;
3655 }
3656
3657 if (mii->reg_num == 1) {
3658 struct bonding *bond = bond_dev->priv;
3659 mii->val_out = 0;
3660 read_lock_bh(&bond->lock);
3661 read_lock(&bond->curr_slave_lock);
4e140079 3662 if (netif_carrier_ok(bond->dev)) {
1da177e4
LT		 3663 mii->val_out = BMSR_LSTATUS;
3664 }
3665 read_unlock(&bond->curr_slave_lock);
3666 read_unlock_bh(&bond->lock);
3667 }
3668
3669 return 0;
3670 case BOND_INFO_QUERY_OLD:
3671 case SIOCBONDINFOQUERY:
3672 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3673
3674 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3675 return -EFAULT;
3676 }
3677
3678 res = bond_info_query(bond_dev, &k_binfo);
3679 if (res == 0) {
3680 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3681 return -EFAULT;
3682 }
3683 }
3684
3685 return res;
3686 case BOND_SLAVE_INFO_QUERY_OLD:
3687 case SIOCBONDSLAVEINFOQUERY:
3688 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3689
3690 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3691 return -EFAULT;
3692 }
3693
3694 res = bond_slave_info_query(bond_dev, &k_sinfo);
3695 if (res == 0) {
3696 if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3697 return -EFAULT;
3698 }
3699 }
3700
3701 return res;
3702 default:
3703 /* Go on */
3704 break;
3705 }
3706
3707 if (!capable(CAP_NET_ADMIN)) {
3708 return -EPERM;
3709 }
3710
b76cdba9 3711 down_write(&(bonding_rwsem));
881d966b 3712 slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
1da177e4
LT		 3713
3714 dprintk("slave_dev=%p: \n", slave_dev);
3715
3716 if (!slave_dev) {
3717 res = -ENODEV;
3718 } else {
3719 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3720 switch (cmd) {
3721 case BOND_ENSLAVE_OLD:
3722 case SIOCBONDENSLAVE:
3723 res = bond_enslave(bond_dev, slave_dev);
3724 break;
3725 case BOND_RELEASE_OLD:
3726 case SIOCBONDRELEASE:
3727 res = bond_release(bond_dev, slave_dev);
3728 break;
3729 case BOND_SETHWADDR_OLD:
3730 case SIOCBONDSETHWADDR:
3731 res = bond_sethwaddr(bond_dev, slave_dev);
3732 break;
3733 case BOND_CHANGE_ACTIVE_OLD:
3734 case SIOCBONDCHANGEACTIVE:
3735 res = bond_ioctl_change_active(bond_dev, slave_dev);
3736 break;
3737 default:
3738 res = -EOPNOTSUPP;
3739 }
3740
3741 dev_put(slave_dev);
3742 }
3743
b76cdba9 3744 up_write(&(bonding_rwsem));
1da177e4
LT		 3745 return res;
3746}
3747
3748static void bond_set_multicast_list(struct net_device *bond_dev)
3749{
3750 struct bonding *bond = bond_dev->priv;
3751 struct dev_mc_list *dmi;
3752
3753 write_lock_bh(&bond->lock);
3754
3755 /*
3756 * Do promisc before checking multicast_mode
3757 */
3758 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3759 bond_set_promiscuity(bond, 1);
3760 }
3761
3762 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3763 bond_set_promiscuity(bond, -1);
3764 }
3765
3766 /* set allmulti flag to slaves */
3767 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3768 bond_set_allmulti(bond, 1);
3769 }
3770
3771 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3772 bond_set_allmulti(bond, -1);
3773 }
3774
3775 bond->flags = bond_dev->flags;
3776
3777 /* looking for addresses to add to slaves' mc list */
3778 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3779 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3780 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3781 }
3782 }
3783
3784 /* looking for addresses to delete from slaves' list */
3785 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3786 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3787 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3788 }
3789 }
3790
3791 /* save master's multicast list */
3792 bond_mc_list_destroy(bond);
3793 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3794
3795 write_unlock_bh(&bond->lock);
3796}
3797
3798/*
3799 * Change the MTU of all of a master's slaves to match the master
3800 */
3801static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3802{
3803 struct bonding *bond = bond_dev->priv;
3804 struct slave *slave, *stop_at;
3805 int res = 0;
3806 int i;
3807
3808 dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3809 (bond_dev ? bond_dev->name : "None"), new_mtu);
3810
3811 /* Can't hold bond->lock with bh disabled here since
3812 * some base drivers panic. On the other hand we can't
3813 * hold bond->lock without bh disabled because we'll
3814 * deadlock. The only solution is to rely on the fact
3815 * that we're under rtnl_lock here, and the slaves
3816 * list won't change. This doesn't solve the problem
3817 * of setting the slave's MTU while it is
3818 * transmitting, but the assumption is that the base
3819 * driver can handle that.
3820 *
3821 * TODO: figure out a way to safely iterate the slaves
3822 * list, but without holding a lock around the actual
3823 * call to the base driver.
3824 */
3825
3826 bond_for_each_slave(bond, slave, i) {
3827 dprintk("s %p s->p %p c_m %p\n", slave,
3828 slave->prev, slave->dev->change_mtu);
e944ef79 3829
1da177e4
LT		 3830 res = dev_set_mtu(slave->dev, new_mtu);
3831
3832 if (res) {
3833 /* If we failed to set the slave's mtu to the new value
3834 * we must abort the operation even in ACTIVE_BACKUP
3835 * mode, because if we allow the backup slaves to have
3836 * different mtu values than the active slave we'll
3837 * need to change their mtu when doing a failover. That
3838 * means changing their mtu from timer context, which
3839 * is probably not a good idea.
3840 */
3841 dprintk("err %d %s\n", res, slave->dev->name);
3842 goto unwind;
3843 }
3844 }
3845
3846 bond_dev->mtu = new_mtu;
3847
3848 return 0;
3849
3850unwind:
3851 /* unwind from head to the slave that failed */
3852 stop_at = slave;
3853 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3854 int tmp_res;
3855
3856 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3857 if (tmp_res) {
3858 dprintk("unwind err %d dev %s\n", tmp_res,
3859 slave->dev->name);
3860 }
3861 }
3862
3863 return res;
3864}
3865
3866/*
3867 * Change HW address
3868 *
3869 * Note that many devices must be down to change the HW address, and
3870 * downing the master releases all slaves. We can make bonds full of
3871 * bonding devices to test this, however.
3872 */
3873static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3874{
3875 struct bonding *bond = bond_dev->priv;
3876 struct sockaddr *sa = addr, tmp_sa;
3877 struct slave *slave, *stop_at;
3878 int res = 0;
3879 int i;
3880
3881 dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3882
3883 if (!is_valid_ether_addr(sa->sa_data)) {
3884 return -EADDRNOTAVAIL;
3885 }
3886
3887 /* Can't hold bond->lock with bh disabled here since
3888 * some base drivers panic. On the other hand we can't
3889 * hold bond->lock without bh disabled because we'll
3890 * deadlock. The only solution is to rely on the fact
3891 * that we're under rtnl_lock here, and the slaves
3892 * list won't change. This doesn't solve the problem
3893 * of setting the slave's hw address while it is
3894 * transmitting, but the assumption is that the base
3895 * driver can handle that.
3896 *
3897 * TODO: figure out a way to safely iterate the slaves
3898 * list, but without holding a lock around the actual
3899 * call to the base driver.
3900 */
3901
3902 bond_for_each_slave(bond, slave, i) {
3903 dprintk("slave %p %s\n", slave, slave->dev->name);
3904
3905 if (slave->dev->set_mac_address == NULL) {
3906 res = -EOPNOTSUPP;
3907 dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3908 goto unwind;
3909 }
3910
3911 res = dev_set_mac_address(slave->dev, addr);
3912 if (res) {
3913 /* TODO: consider downing the slave
3914 * and retry ?
3915 * User should expect communications
3916 * breakage anyway until ARP finish
3917 * updating, so...
3918 */
3919 dprintk("err %d %s\n", res, slave->dev->name);
3920 goto unwind;
3921 }
3922 }
3923
3924 /* success */
3925 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3926 return 0;
3927
3928unwind:
3929 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3930 tmp_sa.sa_family = bond_dev->type;
3931
3932 /* unwind from head to the slave that failed */
3933 stop_at = slave;
3934 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3935 int tmp_res;
3936
3937 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3938 if (tmp_res) {
3939 dprintk("unwind err %d dev %s\n", tmp_res,
3940 slave->dev->name);
3941 }
3942 }
3943
3944 return res;
3945}
3946
3947static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3948{
3949 struct bonding *bond = bond_dev->priv;
3950 struct slave *slave, *start_at;
3951 int i;
3952 int res = 1;
3953
3954 read_lock(&bond->lock);
3955
3956 if (!BOND_IS_OK(bond)) {
3957 goto out;
3958 }
3959
3960 read_lock(&bond->curr_slave_lock);
3961 slave = start_at = bond->curr_active_slave;
3962 read_unlock(&bond->curr_slave_lock);
3963
3964 if (!slave) {
3965 goto out;
3966 }
3967
3968 bond_for_each_slave_from(bond, slave, i, start_at) {
3969 if (IS_UP(slave->dev) &&
3970 (slave->link == BOND_LINK_UP) &&
3971 (slave->state == BOND_STATE_ACTIVE)) {
3972 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3973
3974 write_lock(&bond->curr_slave_lock);
3975 bond->curr_active_slave = slave->next;
3976 write_unlock(&bond->curr_slave_lock);
3977
3978 break;
3979 }
3980 }
3981
3982
3983out:
3984 if (res) {
3985 /* no suitable interface, frame not sent */
3986 dev_kfree_skb(skb);
3987 }
3988 read_unlock(&bond->lock);
3989 return 0;
3990}
3991
075897ce 3992
1da177e4
LT		 3993/*
3994 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3995 * the bond has a usable interface.
3996 */
3997static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3998{
3999 struct bonding *bond = bond_dev->priv;
4000 int res = 1;
4001
1da177e4
LT		 4002 read_lock(&bond->lock);
4003 read_lock(&bond->curr_slave_lock);
4004
4005 if (!BOND_IS_OK(bond)) {
4006 goto out;
4007 }
4008
075897ce
JL		 4009 if (!bond->curr_active_slave)
4010 goto out;
4011
075897ce
JL		 4012 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4013
1da177e4
LT		 4014out:
4015 if (res) {
4016 /* no suitable interface, frame not sent */
4017 dev_kfree_skb(skb);
4018 }
4019 read_unlock(&bond->curr_slave_lock);
4020 read_unlock(&bond->lock);
4021 return 0;
4022}
4023
4024/*
169a3e66
JV		 4025 * In bond_xmit_xor() , we determine the output device by using a pre-
4026 * determined xmit_hash_policy(), If the selected device is not enabled,
4027 * find the next active slave.
1da177e4
LT		 4028 */
4029static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4030{
4031 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 4032 struct slave *slave, *start_at;
4033 int slave_no;
4034 int i;
4035 int res = 1;
4036
4037 read_lock(&bond->lock);
4038
4039 if (!BOND_IS_OK(bond)) {
4040 goto out;
4041 }
4042
169a3e66 4043 slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
1da177e4
LT		 4044
4045 bond_for_each_slave(bond, slave, i) {
4046 slave_no--;
4047 if (slave_no < 0) {
4048 break;
4049 }
4050 }
4051
4052 start_at = slave;
4053
4054 bond_for_each_slave_from(bond, slave, i, start_at) {
4055 if (IS_UP(slave->dev) &&
4056 (slave->link == BOND_LINK_UP) &&
4057 (slave->state == BOND_STATE_ACTIVE)) {
4058 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4059 break;
4060 }
4061 }
4062
4063out:
4064 if (res) {
4065 /* no suitable interface, frame not sent */
4066 dev_kfree_skb(skb);
4067 }
4068 read_unlock(&bond->lock);
4069 return 0;
4070}
4071
4072/*
4073 * in broadcast mode, we send everything to all usable interfaces.
4074 */
4075static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4076{
4077 struct bonding *bond = bond_dev->priv;
4078 struct slave *slave, *start_at;
4079 struct net_device *tx_dev = NULL;
4080 int i;
4081 int res = 1;
4082
4083 read_lock(&bond->lock);
4084
4085 if (!BOND_IS_OK(bond)) {
4086 goto out;
4087 }
4088
4089 read_lock(&bond->curr_slave_lock);
4090 start_at = bond->curr_active_slave;
4091 read_unlock(&bond->curr_slave_lock);
4092
4093 if (!start_at) {
4094 goto out;
4095 }
4096
4097 bond_for_each_slave_from(bond, slave, i, start_at) {
4098 if (IS_UP(slave->dev) &&
4099 (slave->link == BOND_LINK_UP) &&
4100 (slave->state == BOND_STATE_ACTIVE)) {
4101 if (tx_dev) {
4102 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4103 if (!skb2) {
4104 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4105 ": %s: Error: bond_xmit_broadcast(): "
4106 "skb_clone() failed\n",
4107 bond_dev->name);
1da177e4
LT		 4108 continue;
4109 }
4110
4111 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4112 if (res) {
4113 dev_kfree_skb(skb2);
4114 continue;
4115 }
4116 }
4117 tx_dev = slave->dev;
4118 }
4119 }
4120
4121 if (tx_dev) {
4122 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4123 }
4124
4125out:
4126 if (res) {
4127 /* no suitable interface, frame not sent */
4128 dev_kfree_skb(skb);
4129 }
4130 /* frame sent to all suitable interfaces */
4131 read_unlock(&bond->lock);
4132 return 0;
4133}
4134
4135/*------------------------- Device initialization ---------------------------*/
4136
4137/*
4138 * set bond mode specific net device operations
4139 */
a77b5325 4140void bond_set_mode_ops(struct bonding *bond, int mode)
1da177e4 4141{
169a3e66
JV		 4142 struct net_device *bond_dev = bond->dev;
4143
1da177e4
LT		 4144 switch (mode) {
4145 case BOND_MODE_ROUNDROBIN:
4146 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4147 break;
4148 case BOND_MODE_ACTIVEBACKUP:
4149 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4150 break;
4151 case BOND_MODE_XOR:
4152 bond_dev->hard_start_xmit = bond_xmit_xor;
169a3e66
JV		 4153 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4154 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4155 else
4156 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4
LT		 4157 break;
4158 case BOND_MODE_BROADCAST:
4159 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4160 break;
4161 case BOND_MODE_8023AD:
8f903c70 4162 bond_set_master_3ad_flags(bond);
1da177e4 4163 bond_dev->hard_start_xmit = bond_3ad_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 4168 break;
1da177e4 4169 case BOND_MODE_ALB:
8f903c70
JV		 4170 bond_set_master_alb_flags(bond);
4171 /* FALLTHRU */
4172 case BOND_MODE_TLB:
1da177e4
LT		 4173 bond_dev->hard_start_xmit = bond_alb_xmit;
4174 bond_dev->set_mac_address = bond_alb_set_mac_address;
4175 break;
4176 default:
4177 /* Should never happen, mode already checked */
4178 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4179 ": %s: Error: Unknown bonding mode %d\n",
4180 bond_dev->name,
1da177e4
LT		 4181 mode);
4182 break;
4183 }
4184}
4185
217df670
JV		 4186static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4187 struct ethtool_drvinfo *drvinfo)
4188{
4189 strncpy(drvinfo->driver, DRV_NAME, 32);
4190 strncpy(drvinfo->version, DRV_VERSION, 32);
4191 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4192}
4193
7282d491 4194static const struct ethtool_ops bond_ethtool_ops = {
217df670 4195 .get_drvinfo = bond_ethtool_get_drvinfo,
8531c5ff
AK		 4196};
4197
1da177e4
LT		 4198/*
4199 * Does not allocate but creates a /proc entry.
4200 * Allowed to fail.
4201 */
3c535952 4202static int bond_init(struct net_device *bond_dev, struct bond_params *params)
1da177e4
LT		 4203{
4204 struct bonding *bond = bond_dev->priv;
4205
4206 dprintk("Begin bond_init for %s\n", bond_dev->name);
4207
4208 /* initialize rwlocks */
4209 rwlock_init(&bond->lock);
4210 rwlock_init(&bond->curr_slave_lock);
4211
4212 bond->params = *params; /* copy params struct */
4213
4214 /* Initialize pointers */
4215 bond->first_slave = NULL;
4216 bond->curr_active_slave = NULL;
4217 bond->current_arp_slave = NULL;
4218 bond->primary_slave = NULL;
4219 bond->dev = bond_dev;
4220 INIT_LIST_HEAD(&bond->vlan_list);
4221
4222 /* Initialize the device entry points */
4223 bond_dev->open = bond_open;
4224 bond_dev->stop = bond_close;
4225 bond_dev->get_stats = bond_get_stats;
4226 bond_dev->do_ioctl = bond_do_ioctl;
8531c5ff 4227 bond_dev->ethtool_ops = &bond_ethtool_ops;
1da177e4
LT		 4228 bond_dev->set_multicast_list = bond_set_multicast_list;
4229 bond_dev->change_mtu = bond_change_mtu;
4230 bond_dev->set_mac_address = bond_set_mac_address;
4231
169a3e66 4232 bond_set_mode_ops(bond, bond->params.mode);
1da177e4
LT		 4233
4234 bond_dev->destructor = free_netdev;
4235
4236 /* Initialize the device options */
4237 bond_dev->tx_queue_len = 0;
4238 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
0b680e75 4239 bond_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 4240
4241 /* At first, we block adding VLANs. That's the only way to
4242 * prevent problems that occur when adding VLANs over an
4243 * empty bond. The block will be removed once non-challenged
4244 * slaves are enslaved.
4245 */
4246 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4247
932ff279 4248 /* don't acquire bond device's netif_tx_lock when
1da177e4
LT		 4249 * transmitting */
4250 bond_dev->features |= NETIF_F_LLTX;
4251
4252 /* By default, we declare the bond to be fully
4253 * VLAN hardware accelerated capable. Special
4254 * care is taken in the various xmit functions
4255 * when there are slaves that are not hw accel
4256 * capable
4257 */
4258 bond_dev->vlan_rx_register = bond_vlan_rx_register;
4259 bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid;
4260 bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4261 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4262 NETIF_F_HW_VLAN_RX |
4263 NETIF_F_HW_VLAN_FILTER);
4264
4265#ifdef CONFIG_PROC_FS
4266 bond_create_proc_entry(bond);
4267#endif
4268
4269 list_add_tail(&bond->bond_list, &bond_dev_list);
4270
4271 return 0;
4272}
4273
4274/* De-initialize device specific data.
4275 * Caller must hold rtnl_lock.
4276 */
a77b5325 4277void bond_deinit(struct net_device *bond_dev)
1da177e4
LT		 4278{
4279 struct bonding *bond = bond_dev->priv;
4280
4281 list_del(&bond->bond_list);
4282
4283#ifdef CONFIG_PROC_FS
4284 bond_remove_proc_entry(bond);
4285#endif
4286}
4287
4288/* Unregister and free all bond devices.
4289 * Caller must hold rtnl_lock.
4290 */
4291static void bond_free_all(void)
4292{
4293 struct bonding *bond, *nxt;
4294
4295 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4296 struct net_device *bond_dev = bond->dev;
4297
70298705 4298 bond_mc_list_destroy(bond);
4299 /* Release the bonded slaves */
4300 bond_release_all(bond_dev);
1da177e4 4301 bond_deinit(bond_dev);
3201e656 4302 unregister_netdevice(bond_dev);
1da177e4
LT		 4303 }
4304
4305#ifdef CONFIG_PROC_FS
4306 bond_destroy_proc_dir();
4307#endif
4308}
4309
4310/*------------------------- Module initialization ---------------------------*/
4311
4312/*
4313 * Convert string input module parms. Accept either the
4314 * number of the mode or its string name.
4315 */
a77b5325 4316int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
1da177e4
LT		 4317{
4318 int i;
4319
4320 for (i = 0; tbl[i].modename; i++) {
4321 if ((isdigit(*mode_arg) &&
4322 tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4323 (strncmp(mode_arg, tbl[i].modename,
4324 strlen(tbl[i].modename)) == 0)) {
4325 return tbl[i].mode;
4326 }
4327 }
4328
4329 return -1;
4330}
4331
4332static int bond_check_params(struct bond_params *params)
4333{
f5b2b966
JV		 4334 int arp_validate_value;
4335
1da177e4
LT		 4336 /*
4337 * Convert string parameters.
4338 */
4339 if (mode) {
4340 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4341 if (bond_mode == -1) {
4342 printk(KERN_ERR DRV_NAME
4343 ": Error: Invalid bonding mode \"%s\"\n",
4344 mode == NULL ? "NULL" : mode);
4345 return -EINVAL;
4346 }
4347 }
4348
169a3e66
JV		 4349 if (xmit_hash_policy) {
4350 if ((bond_mode != BOND_MODE_XOR) &&
4351 (bond_mode != BOND_MODE_8023AD)) {
4352 printk(KERN_INFO DRV_NAME
4353 ": xor_mode param is irrelevant in mode %s\n",
4354 bond_mode_name(bond_mode));
4355 } else {
4356 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4357 xmit_hashtype_tbl);
4358 if (xmit_hashtype == -1) {
4359 printk(KERN_ERR DRV_NAME
4360 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4361 xmit_hash_policy == NULL ? "NULL" :
4362 xmit_hash_policy);
4363 return -EINVAL;
4364 }
4365 }
4366 }
4367
1da177e4
LT		 4368 if (lacp_rate) {
4369 if (bond_mode != BOND_MODE_8023AD) {
4370 printk(KERN_INFO DRV_NAME
4371 ": lacp_rate param is irrelevant in mode %s\n",
4372 bond_mode_name(bond_mode));
4373 } else {
4374 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4375 if (lacp_fast == -1) {
4376 printk(KERN_ERR DRV_NAME
4377 ": Error: Invalid lacp rate \"%s\"\n",
4378 lacp_rate == NULL ? "NULL" : lacp_rate);
4379 return -EINVAL;
4380 }
4381 }
4382 }
4383
4384 if (max_bonds < 1 || max_bonds > INT_MAX) {
4385 printk(KERN_WARNING DRV_NAME
4386 ": Warning: max_bonds (%d) not in range %d-%d, so it "
4e0952c7 4387 "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
1da177e4
LT		 4388 max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4389 max_bonds = BOND_DEFAULT_MAX_BONDS;
4390 }
4391
4392 if (miimon < 0) {
4393 printk(KERN_WARNING DRV_NAME
4394 ": Warning: miimon module parameter (%d), "
4395 "not in range 0-%d, so it was reset to %d\n",
4396 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4397 miimon = BOND_LINK_MON_INTERV;
4398 }
4399
4400 if (updelay < 0) {
4401 printk(KERN_WARNING DRV_NAME
4402 ": Warning: updelay module parameter (%d), "
4403 "not in range 0-%d, so it was reset to 0\n",
4404 updelay, INT_MAX);
4405 updelay = 0;
4406 }
4407
4408 if (downdelay < 0) {
4409 printk(KERN_WARNING DRV_NAME
4410 ": Warning: downdelay module parameter (%d), "
4411 "not in range 0-%d, so it was reset to 0\n",
4412 downdelay, INT_MAX);
4413 downdelay = 0;
4414 }
4415
4416 if ((use_carrier != 0) && (use_carrier != 1)) {
4417 printk(KERN_WARNING DRV_NAME
4418 ": Warning: use_carrier module parameter (%d), "
4419 "not of valid value (0/1), so it was set to 1\n",
4420 use_carrier);
4421 use_carrier = 1;
4422 }
4423
4424 /* reset values for 802.3ad */
4425 if (bond_mode == BOND_MODE_8023AD) {
4426 if (!miimon) {
4427 printk(KERN_WARNING DRV_NAME
4428 ": Warning: miimon must be specified, "
4429 "otherwise bonding will not detect link "
4430 "failure, speed and duplex which are "
4431 "essential for 802.3ad operation\n");
4432 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4433 miimon = 100;
4434 }
4435 }
4436
4437 /* reset values for TLB/ALB */
4438 if ((bond_mode == BOND_MODE_TLB) ||
4439 (bond_mode == BOND_MODE_ALB)) {
4440 if (!miimon) {
4441 printk(KERN_WARNING DRV_NAME
4442 ": Warning: miimon must be specified, "
4443 "otherwise bonding will not detect link "
4444 "failure and link speed which are essential "
4445 "for TLB/ALB load balancing\n");
4446 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4447 miimon = 100;
4448 }
4449 }
4450
4451 if (bond_mode == BOND_MODE_ALB) {
4452 printk(KERN_NOTICE DRV_NAME
4453 ": In ALB mode you might experience client "
4454 "disconnections upon reconnection of a link if the "
4455 "bonding module updelay parameter (%d msec) is "
4456 "incompatible with the forwarding delay time of the "
4457 "switch\n",
4458 updelay);
4459 }
4460
4461 if (!miimon) {
4462 if (updelay || downdelay) {
4463 /* just warn the user the up/down delay will have
4464 * no effect since miimon is zero...
4465 */
4466 printk(KERN_WARNING DRV_NAME
4467 ": Warning: miimon module parameter not set "
4468 "and updelay (%d) or downdelay (%d) module "
4469 "parameter is set; updelay and downdelay have "
4470 "no effect unless miimon is set\n",
4471 updelay, downdelay);
4472 }
4473 } else {
4474 /* don't allow arp monitoring */
4475 if (arp_interval) {
4476 printk(KERN_WARNING DRV_NAME
4477 ": Warning: miimon (%d) and arp_interval (%d) "
4478 "can't be used simultaneously, disabling ARP "
4479 "monitoring\n",
4480 miimon, arp_interval);
4481 arp_interval = 0;
4482 }
4483
4484 if ((updelay % miimon) != 0) {
4485 printk(KERN_WARNING DRV_NAME
4486 ": Warning: updelay (%d) is not a multiple "
4487 "of miimon (%d), updelay rounded to %d ms\n",
4488 updelay, miimon, (updelay / miimon) * miimon);
4489 }
4490
4491 updelay /= miimon;
4492
4493 if ((downdelay % miimon) != 0) {
4494 printk(KERN_WARNING DRV_NAME
4495 ": Warning: downdelay (%d) is not a multiple "
4496 "of miimon (%d), downdelay rounded to %d ms\n",
4497 downdelay, miimon,
4498 (downdelay / miimon) * miimon);
4499 }
4500
4501 downdelay /= miimon;
4502 }
4503
4504 if (arp_interval < 0) {
4505 printk(KERN_WARNING DRV_NAME
4506 ": Warning: arp_interval module parameter (%d) "
4507 ", not in range 0-%d, so it was reset to %d\n",
4508 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4509 arp_interval = BOND_LINK_ARP_INTERV;
4510 }
4511
4512 for (arp_ip_count = 0;
4513 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4514 arp_ip_count++) {
4515 /* not complete check, but should be good enough to
4516 catch mistakes */
4517 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4518 printk(KERN_WARNING DRV_NAME
4519 ": Warning: bad arp_ip_target module parameter "
4520 "(%s), ARP monitoring will not be performed\n",
4521 arp_ip_target[arp_ip_count]);
4522 arp_interval = 0;
4523 } else {
4524 u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4525 arp_target[arp_ip_count] = ip;
4526 }
4527 }
4528
4529 if (arp_interval && !arp_ip_count) {
4530 /* don't allow arping if no arp_ip_target given... */
4531 printk(KERN_WARNING DRV_NAME
4532 ": Warning: arp_interval module parameter (%d) "
4533 "specified without providing an arp_ip_target "
4534 "parameter, arp_interval was reset to 0\n",
4535 arp_interval);
4536 arp_interval = 0;
4537 }
4538
f5b2b966
JV		 4539 if (arp_validate) {
4540 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4541 printk(KERN_ERR DRV_NAME
4542 ": arp_validate only supported in active-backup mode\n");
4543 return -EINVAL;
4544 }
4545 if (!arp_interval) {
4546 printk(KERN_ERR DRV_NAME
4547 ": arp_validate requires arp_interval\n");
4548 return -EINVAL;
4549 }
4550
4551 arp_validate_value = bond_parse_parm(arp_validate,
4552 arp_validate_tbl);
4553 if (arp_validate_value == -1) {
4554 printk(KERN_ERR DRV_NAME
4555 ": Error: invalid arp_validate \"%s\"\n",
4556 arp_validate == NULL ? "NULL" : arp_validate);
4557 return -EINVAL;
4558 }
4559 } else
4560 arp_validate_value = 0;
4561
1da177e4
LT		 4562 if (miimon) {
4563 printk(KERN_INFO DRV_NAME
4564 ": MII link monitoring set to %d ms\n",
4565 miimon);
4566 } else if (arp_interval) {
4567 int i;
4568
4569 printk(KERN_INFO DRV_NAME
f5b2b966
JV		 4570 ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4571 arp_interval,
4572 arp_validate_tbl[arp_validate_value].modename,
4573 arp_ip_count);
1da177e4
LT		 4574
4575 for (i = 0; i < arp_ip_count; i++)
4576 printk (" %s", arp_ip_target[i]);
4577
4578 printk("\n");
4579
4580 } else {
4581 /* miimon and arp_interval not set, we need one so things
4582 * work as expected, see bonding.txt for details
4583 */
4584 printk(KERN_WARNING DRV_NAME
4585 ": Warning: either miimon or arp_interval and "
4586 "arp_ip_target module parameters must be specified, "
4587 "otherwise bonding will not detect link failures! see "
4588 "bonding.txt for details.\n");
4589 }
4590
4591 if (primary && !USES_PRIMARY(bond_mode)) {
4592 /* currently, using a primary only makes sense
4593 * in active backup, TLB or ALB modes
4594 */
4595 printk(KERN_WARNING DRV_NAME
4596 ": Warning: %s primary device specified but has no "
4597 "effect in %s mode\n",
4598 primary, bond_mode_name(bond_mode));
4599 primary = NULL;
4600 }
4601
4602 /* fill params struct with the proper values */
4603 params->mode = bond_mode;
169a3e66 4604 params->xmit_policy = xmit_hashtype;
1da177e4
LT		 4605 params->miimon = miimon;
4606 params->arp_interval = arp_interval;
f5b2b966 4607 params->arp_validate = arp_validate_value;
1da177e4
LT		 4608 params->updelay = updelay;
4609 params->downdelay = downdelay;
4610 params->use_carrier = use_carrier;
4611 params->lacp_fast = lacp_fast;
4612 params->primary[0] = 0;
4613
4614 if (primary) {
4615 strncpy(params->primary, primary, IFNAMSIZ);
4616 params->primary[IFNAMSIZ - 1] = 0;
4617 }
4618
4619 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4620
4621 return 0;
4622}
4623
0daa2303
PZ		 4624static struct lock_class_key bonding_netdev_xmit_lock_key;
4625
dfe60397 4626/* Create a new bond based on the specified name and bonding parameters.
e4b91c48 4627 * If name is NULL, obtain a suitable "bond%d" name for us.
dfe60397
MW		 4628 * Caller must NOT hold rtnl_lock; we need to release it here before we
4629 * set up our sysfs entries.
4630 */
4631int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4632{
4633 struct net_device *bond_dev;
4634 int res;
4635
4636 rtnl_lock();
e4b91c48
JV		 4637 bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4638 ether_setup);
dfe60397
MW		 4639 if (!bond_dev) {
4640 printk(KERN_ERR DRV_NAME
4641 ": %s: eek! can't alloc netdev!\n",
4642 name);
4643 res = -ENOMEM;
4644 goto out_rtnl;
4645 }
4646
e4b91c48
JV		 4647 if (!name) {
4648 res = dev_alloc_name(bond_dev, "bond%d");
4649 if (res < 0)
4650 goto out_netdev;
4651 }
4652
dfe60397
MW		 4653 /* bond_init() must be called after dev_alloc_name() (for the
4654 * /proc files), but before register_netdevice(), because we
4655 * need to set function pointers.
4656 */
4657
4658 res = bond_init(bond_dev, params);
4659 if (res < 0) {
4660 goto out_netdev;
4661 }
4662
dfe60397
MW		 4663 res = register_netdevice(bond_dev);
4664 if (res < 0) {
4665 goto out_bond;
4666 }
0daa2303
PZ		 4667
4668 lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4669
dfe60397
MW		 4670 if (newbond)
4671 *newbond = bond_dev->priv;
4672
ff59c456
JV		 4673 netif_carrier_off(bond_dev);
4674
dfe60397 4675 rtnl_unlock(); /* allows sysfs registration of net device */
b76cdba9 4676 res = bond_create_sysfs_entry(bond_dev->priv);
09c89279
JV		 4677 if (res < 0) {
4678 rtnl_lock();
4679 goto out_bond;
4680 }
4681
4682 return 0;
4683
dfe60397
MW		 4684out_bond:
4685 bond_deinit(bond_dev);
4686out_netdev:
4687 free_netdev(bond_dev);
4688out_rtnl:
4689 rtnl_unlock();
dfe60397
MW		 4690 return res;
4691}
4692
1da177e4
LT		 4693static int __init bonding_init(void)
4694{
1da177e4
LT		 4695 int i;
4696 int res;
4697
4698 printk(KERN_INFO "%s", version);
4699
dfe60397 4700 res = bond_check_params(&bonding_defaults);
1da177e4 4701 if (res) {
dfe60397 4702 goto out;
1da177e4
LT		 4703 }
4704
1da177e4
LT		 4705#ifdef CONFIG_PROC_FS
4706 bond_create_proc_dir();
4707#endif
1da177e4 4708 for (i = 0; i < max_bonds; i++) {
e4b91c48 4709 res = bond_create(NULL, &bonding_defaults, NULL);
dfe60397
MW		 4710 if (res)
4711 goto err;
1da177e4
LT		 4712 }
4713
b76cdba9
MW		 4714 res = bond_create_sysfs();
4715 if (res)
4716 goto err;
4717
1da177e4 4718 register_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4719 register_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4 4720
dfe60397
MW		 4721 goto out;
4722err:
40abc270 4723 rtnl_lock();
1da177e4 4724 bond_free_all();
b76cdba9 4725 bond_destroy_sysfs();
1da177e4 4726 rtnl_unlock();
dfe60397 4727out:
1da177e4 4728 return res;
dfe60397 4729
1da177e4
LT		 4730}
4731
4732static void __exit bonding_exit(void)
4733{
4734 unregister_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4735 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4
LT		 4736
4737 rtnl_lock();
4738 bond_free_all();
b76cdba9 4739 bond_destroy_sysfs();
1da177e4
LT		 4740 rtnl_unlock();
4741}
4742
4743module_init(bonding_init);
4744module_exit(bonding_exit);
4745MODULE_LICENSE("GPL");
4746MODULE_VERSION(DRV_VERSION);
4747MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4748MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4749MODULE_SUPPORTED_DEVICE("most ethernet devices");
4750
4751/*
4752 * Local variables:
4753 * c-indent-level: 8
4754 * c-basic-offset: 8
4755 * tab-width: 8
4756 * End:
4757 */
4758
Clone of davem's net-next-2.6 tree