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[PATCH] bonding: Don't release slaves when master is admin down
[net-next-2.6.git] / drivers / net / bonding / bond_main.c
CommitLineData
1da177e4
LT		 1/*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
1da177e4
LT		 32 */
33
34//#define BONDING_DEBUG 1
35
1da177e4
LT		 36#include <linux/kernel.h>
37#include <linux/module.h>
38#include <linux/sched.h>
39#include <linux/types.h>
40#include <linux/fcntl.h>
41#include <linux/interrupt.h>
42#include <linux/ptrace.h>
43#include <linux/ioport.h>
44#include <linux/in.h>
169a3e66 45#include <net/ip.h>
1da177e4 46#include <linux/ip.h>
169a3e66
JV		 47#include <linux/tcp.h>
48#include <linux/udp.h>
1da177e4
LT		 49#include <linux/slab.h>
50#include <linux/string.h>
51#include <linux/init.h>
52#include <linux/timer.h>
53#include <linux/socket.h>
54#include <linux/ctype.h>
55#include <linux/inet.h>
56#include <linux/bitops.h>
57#include <asm/system.h>
58#include <asm/io.h>
59#include <asm/dma.h>
60#include <asm/uaccess.h>
61#include <linux/errno.h>
62#include <linux/netdevice.h>
63#include <linux/inetdevice.h>
64#include <linux/etherdevice.h>
65#include <linux/skbuff.h>
66#include <net/sock.h>
67#include <linux/rtnetlink.h>
68#include <linux/proc_fs.h>
69#include <linux/seq_file.h>
70#include <linux/smp.h>
71#include <linux/if_ether.h>
72#include <net/arp.h>
73#include <linux/mii.h>
74#include <linux/ethtool.h>
75#include <linux/if_vlan.h>
76#include <linux/if_bonding.h>
c3ade5ca 77#include <net/route.h>
1da177e4
LT		 78#include "bonding.h"
79#include "bond_3ad.h"
80#include "bond_alb.h"
81
82/*---------------------------- Module parameters ----------------------------*/
83
84/* monitor all links that often (in milliseconds). <=0 disables monitoring */
85#define BOND_LINK_MON_INTERV 0
86#define BOND_LINK_ARP_INTERV 0
87
88static int max_bonds = BOND_DEFAULT_MAX_BONDS;
89static int miimon = BOND_LINK_MON_INTERV;
90static int updelay = 0;
91static int downdelay = 0;
92static int use_carrier = 1;
93static char *mode = NULL;
94static char *primary = NULL;
95static char *lacp_rate = NULL;
169a3e66 96static char *xmit_hash_policy = NULL;
1da177e4
LT		 97static int arp_interval = BOND_LINK_ARP_INTERV;
98static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
12479f9a 99struct bond_params bonding_defaults;
1da177e4
LT		 100
101module_param(max_bonds, int, 0);
102MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
103module_param(miimon, int, 0);
104MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
105module_param(updelay, int, 0);
106MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
107module_param(downdelay, int, 0);
2ac47660
MW		 108MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
109 "in milliseconds");
1da177e4 110module_param(use_carrier, int, 0);
2ac47660
MW		 111MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
112 "0 for off, 1 for on (default)");
1da177e4 113module_param(mode, charp, 0);
2ac47660
MW		 114MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
115 "1 for active-backup, 2 for balance-xor, "
116 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
117 "6 for balance-alb");
1da177e4
LT		 118module_param(primary, charp, 0);
119MODULE_PARM_DESC(primary, "Primary network device to use");
120module_param(lacp_rate, charp, 0);
2ac47660
MW		 121MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
122 "(slow/fast)");
169a3e66 123module_param(xmit_hash_policy, charp, 0);
2ac47660
MW		 124MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
125 ", 1 for layer 3+4");
1da177e4
LT		 126module_param(arp_interval, int, 0);
127MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
128module_param_array(arp_ip_target, charp, NULL, 0);
129MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
130
131/*----------------------------- Global variables ----------------------------*/
132
f71e1309 133static const char * const version =
1da177e4
LT		 134 DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
135
12479f9a 136LIST_HEAD(bond_dev_list);
1da177e4
LT		 137
138#ifdef CONFIG_PROC_FS
139static struct proc_dir_entry *bond_proc_dir = NULL;
140#endif
141
b76cdba9 142extern struct rw_semaphore bonding_rwsem;
1da177e4
LT		 143static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
144static int arp_ip_count = 0;
1da177e4 145static int bond_mode = BOND_MODE_ROUNDROBIN;
169a3e66 146static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
1da177e4 147static int lacp_fast = 0;
217df670 148
1da177e4 149
12479f9a 150struct bond_parm_tbl bond_lacp_tbl[] = {
1da177e4
LT		 151{ "slow", AD_LACP_SLOW},
152{ "fast", AD_LACP_FAST},
153{ NULL, -1},
154};
155
12479f9a 156struct bond_parm_tbl bond_mode_tbl[] = {
1da177e4
LT		 157{ "balance-rr", BOND_MODE_ROUNDROBIN},
158{ "active-backup", BOND_MODE_ACTIVEBACKUP},
159{ "balance-xor", BOND_MODE_XOR},
160{ "broadcast", BOND_MODE_BROADCAST},
161{ "802.3ad", BOND_MODE_8023AD},
162{ "balance-tlb", BOND_MODE_TLB},
163{ "balance-alb", BOND_MODE_ALB},
164{ NULL, -1},
165};
166
12479f9a 167struct bond_parm_tbl xmit_hashtype_tbl[] = {
169a3e66
JV		 168{ "layer2", BOND_XMIT_POLICY_LAYER2},
169{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
170{ NULL, -1},
171};
172
1da177e4
LT		 173/*-------------------------- Forward declarations ---------------------------*/
174
c3ade5ca 175static void bond_send_gratuitous_arp(struct bonding *bond);
1da177e4
LT		 176
177/*---------------------------- General routines -----------------------------*/
178
a77b5325 179const char *bond_mode_name(int mode)
1da177e4
LT		 180{
181 switch (mode) {
182 case BOND_MODE_ROUNDROBIN :
183 return "load balancing (round-robin)";
184 case BOND_MODE_ACTIVEBACKUP :
185 return "fault-tolerance (active-backup)";
186 case BOND_MODE_XOR :
187 return "load balancing (xor)";
188 case BOND_MODE_BROADCAST :
189 return "fault-tolerance (broadcast)";
190 case BOND_MODE_8023AD:
191 return "IEEE 802.3ad Dynamic link aggregation";
192 case BOND_MODE_TLB:
193 return "transmit load balancing";
194 case BOND_MODE_ALB:
195 return "adaptive load balancing";
196 default:
197 return "unknown";
198 }
199}
200
201/*---------------------------------- VLAN -----------------------------------*/
202
203/**
204 * bond_add_vlan - add a new vlan id on bond
205 * @bond: bond that got the notification
206 * @vlan_id: the vlan id to add
207 *
208 * Returns -ENOMEM if allocation failed.
209 */
210static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
211{
212 struct vlan_entry *vlan;
213
214 dprintk("bond: %s, vlan id %d\n",
215 (bond ? bond->dev->name: "None"), vlan_id);
216
217 vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
218 if (!vlan) {
219 return -ENOMEM;
220 }
221
222 INIT_LIST_HEAD(&vlan->vlan_list);
223 vlan->vlan_id = vlan_id;
c3ade5ca 224 vlan->vlan_ip = 0;
1da177e4
LT		 225
226 write_lock_bh(&bond->lock);
227
228 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
229
230 write_unlock_bh(&bond->lock);
231
232 dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
233
234 return 0;
235}
236
237/**
238 * bond_del_vlan - delete a vlan id from bond
239 * @bond: bond that got the notification
240 * @vlan_id: the vlan id to delete
241 *
242 * returns -ENODEV if @vlan_id was not found in @bond.
243 */
244static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
245{
246 struct vlan_entry *vlan, *next;
247 int res = -ENODEV;
248
249 dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
250
251 write_lock_bh(&bond->lock);
252
253 list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
254 if (vlan->vlan_id == vlan_id) {
255 list_del(&vlan->vlan_list);
256
257 if ((bond->params.mode == BOND_MODE_TLB) ||
258 (bond->params.mode == BOND_MODE_ALB)) {
259 bond_alb_clear_vlan(bond, vlan_id);
260 }
261
262 dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
263 bond->dev->name);
264
265 kfree(vlan);
266
267 if (list_empty(&bond->vlan_list) &&
268 (bond->slave_cnt == 0)) {
269 /* Last VLAN removed and no slaves, so
270 * restore block on adding VLANs. This will
271 * be removed once new slaves that are not
272 * VLAN challenged will be added.
273 */
274 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
275 }
276
277 res = 0;
278 goto out;
279 }
280 }
281
282 dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
283 bond->dev->name);
284
285out:
286 write_unlock_bh(&bond->lock);
287 return res;
288}
289
290/**
291 * bond_has_challenged_slaves
292 * @bond: the bond we're working on
293 *
294 * Searches the slave list. Returns 1 if a vlan challenged slave
295 * was found, 0 otherwise.
296 *
297 * Assumes bond->lock is held.
298 */
299static int bond_has_challenged_slaves(struct bonding *bond)
300{
301 struct slave *slave;
302 int i;
303
304 bond_for_each_slave(bond, slave, i) {
305 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
306 dprintk("found VLAN challenged slave - %s\n",
307 slave->dev->name);
308 return 1;
309 }
310 }
311
312 dprintk("no VLAN challenged slaves found\n");
313 return 0;
314}
315
316/**
317 * bond_next_vlan - safely skip to the next item in the vlans list.
318 * @bond: the bond we're working on
319 * @curr: item we're advancing from
320 *
321 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
322 * or @curr->next otherwise (even if it is @curr itself again).
323 *
324 * Caller must hold bond->lock
325 */
326struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
327{
328 struct vlan_entry *next, *last;
329
330 if (list_empty(&bond->vlan_list)) {
331 return NULL;
332 }
333
334 if (!curr) {
335 next = list_entry(bond->vlan_list.next,
336 struct vlan_entry, vlan_list);
337 } else {
338 last = list_entry(bond->vlan_list.prev,
339 struct vlan_entry, vlan_list);
340 if (last == curr) {
341 next = list_entry(bond->vlan_list.next,
342 struct vlan_entry, vlan_list);
343 } else {
344 next = list_entry(curr->vlan_list.next,
345 struct vlan_entry, vlan_list);
346 }
347 }
348
349 return next;
350}
351
352/**
353 * bond_dev_queue_xmit - Prepare skb for xmit.
354 *
355 * @bond: bond device that got this skb for tx.
356 * @skb: hw accel VLAN tagged skb to transmit
357 * @slave_dev: slave that is supposed to xmit this skbuff
358 *
359 * When the bond gets an skb to transmit that is
360 * already hardware accelerated VLAN tagged, and it
361 * needs to relay this skb to a slave that is not
362 * hw accel capable, the skb needs to be "unaccelerated",
363 * i.e. strip the hwaccel tag and re-insert it as part
364 * of the payload.
365 */
366int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
367{
368 unsigned short vlan_id;
369
370 if (!list_empty(&bond->vlan_list) &&
371 !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
372 vlan_get_tag(skb, &vlan_id) == 0) {
373 skb->dev = slave_dev;
374 skb = vlan_put_tag(skb, vlan_id);
375 if (!skb) {
376 /* vlan_put_tag() frees the skb in case of error,
377 * so return success here so the calling functions
378 * won't attempt to free is again.
379 */
380 return 0;
381 }
382 } else {
383 skb->dev = slave_dev;
384 }
385
386 skb->priority = 1;
387 dev_queue_xmit(skb);
388
389 return 0;
390}
391
392/*
393 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
394 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
395 * lock because:
396 * a. This operation is performed in IOCTL context,
397 * b. The operation is protected by the RTNL semaphore in the 8021q code,
398 * c. Holding a lock with BH disabled while directly calling a base driver
399 * entry point is generally a BAD idea.
400 *
401 * The design of synchronization/protection for this operation in the 8021q
402 * module is good for one or more VLAN devices over a single physical device
403 * and cannot be extended for a teaming solution like bonding, so there is a
404 * potential race condition here where a net device from the vlan group might
405 * be referenced (either by a base driver or the 8021q code) while it is being
406 * removed from the system. However, it turns out we're not making matters
407 * worse, and if it works for regular VLAN usage it will work here too.
408*/
409
410/**
411 * bond_vlan_rx_register - Propagates registration to slaves
412 * @bond_dev: bonding net device that got called
413 * @grp: vlan group being registered
414 */
415static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
416{
417 struct bonding *bond = bond_dev->priv;
418 struct slave *slave;
419 int i;
420
421 bond->vlgrp = grp;
422
423 bond_for_each_slave(bond, slave, i) {
424 struct net_device *slave_dev = slave->dev;
425
426 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
427 slave_dev->vlan_rx_register) {
428 slave_dev->vlan_rx_register(slave_dev, grp);
429 }
430 }
431}
432
433/**
434 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
435 * @bond_dev: bonding net device that got called
436 * @vid: vlan id being added
437 */
438static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
439{
440 struct bonding *bond = bond_dev->priv;
441 struct slave *slave;
442 int i, res;
443
444 bond_for_each_slave(bond, slave, i) {
445 struct net_device *slave_dev = slave->dev;
446
447 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
448 slave_dev->vlan_rx_add_vid) {
449 slave_dev->vlan_rx_add_vid(slave_dev, vid);
450 }
451 }
452
453 res = bond_add_vlan(bond, vid);
454 if (res) {
455 printk(KERN_ERR DRV_NAME
4e0952c7 456 ": %s: Error: Failed to add vlan id %d\n",
1da177e4
LT		 457 bond_dev->name, vid);
458 }
459}
460
461/**
462 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
463 * @bond_dev: bonding net device that got called
464 * @vid: vlan id being removed
465 */
466static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
467{
468 struct bonding *bond = bond_dev->priv;
469 struct slave *slave;
470 struct net_device *vlan_dev;
471 int i, res;
472
473 bond_for_each_slave(bond, slave, i) {
474 struct net_device *slave_dev = slave->dev;
475
476 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
477 slave_dev->vlan_rx_kill_vid) {
478 /* Save and then restore vlan_dev in the grp array,
479 * since the slave's driver might clear it.
480 */
481 vlan_dev = bond->vlgrp->vlan_devices[vid];
482 slave_dev->vlan_rx_kill_vid(slave_dev, vid);
483 bond->vlgrp->vlan_devices[vid] = vlan_dev;
484 }
485 }
486
487 res = bond_del_vlan(bond, vid);
488 if (res) {
489 printk(KERN_ERR DRV_NAME
4e0952c7 490 ": %s: Error: Failed to remove vlan id %d\n",
1da177e4
LT		 491 bond_dev->name, vid);
492 }
493}
494
495static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
496{
497 struct vlan_entry *vlan;
498
499 write_lock_bh(&bond->lock);
500
501 if (list_empty(&bond->vlan_list)) {
502 goto out;
503 }
504
505 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
506 slave_dev->vlan_rx_register) {
507 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
508 }
509
510 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
511 !(slave_dev->vlan_rx_add_vid)) {
512 goto out;
513 }
514
515 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
516 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
517 }
518
519out:
520 write_unlock_bh(&bond->lock);
521}
522
523static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
524{
525 struct vlan_entry *vlan;
526 struct net_device *vlan_dev;
527
528 write_lock_bh(&bond->lock);
529
530 if (list_empty(&bond->vlan_list)) {
531 goto out;
532 }
533
534 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
535 !(slave_dev->vlan_rx_kill_vid)) {
536 goto unreg;
537 }
538
539 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
540 /* Save and then restore vlan_dev in the grp array,
541 * since the slave's driver might clear it.
542 */
543 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
544 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
545 bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev;
546 }
547
548unreg:
549 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
550 slave_dev->vlan_rx_register) {
551 slave_dev->vlan_rx_register(slave_dev, NULL);
552 }
553
554out:
555 write_unlock_bh(&bond->lock);
556}
557
558/*------------------------------- Link status -------------------------------*/
559
ff59c456
JV		 560/*
561 * Set the carrier state for the master according to the state of its
562 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
563 * do special 802.3ad magic.
564 *
565 * Returns zero if carrier state does not change, nonzero if it does.
566 */
567static int bond_set_carrier(struct bonding *bond)
568{
569 struct slave *slave;
570 int i;
571
572 if (bond->slave_cnt == 0)
573 goto down;
574
575 if (bond->params.mode == BOND_MODE_8023AD)
576 return bond_3ad_set_carrier(bond);
577
578 bond_for_each_slave(bond, slave, i) {
579 if (slave->link == BOND_LINK_UP) {
580 if (!netif_carrier_ok(bond->dev)) {
581 netif_carrier_on(bond->dev);
582 return 1;
583 }
584 return 0;
585 }
586 }
587
588down:
589 if (netif_carrier_ok(bond->dev)) {
590 netif_carrier_off(bond->dev);
591 return 1;
592 }
593 return 0;
594}
595
1da177e4
LT		 596/*
597 * Get link speed and duplex from the slave's base driver
598 * using ethtool. If for some reason the call fails or the
599 * values are invalid, fake speed and duplex to 100/Full
600 * and return error.
601 */
602static int bond_update_speed_duplex(struct slave *slave)
603{
604 struct net_device *slave_dev = slave->dev;
605 static int (* ioctl)(struct net_device *, struct ifreq *, int);
606 struct ifreq ifr;
607 struct ethtool_cmd etool;
608
609 /* Fake speed and duplex */
610 slave->speed = SPEED_100;
611 slave->duplex = DUPLEX_FULL;
612
613 if (slave_dev->ethtool_ops) {
6a986ce4 614 int res;
1da177e4
LT		 615
616 if (!slave_dev->ethtool_ops->get_settings) {
617 return -1;
618 }
619
620 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
621 if (res < 0) {
622 return -1;
623 }
624
625 goto verify;
626 }
627
628 ioctl = slave_dev->do_ioctl;
629 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
630 etool.cmd = ETHTOOL_GSET;
631 ifr.ifr_data = (char*)&etool;
632 if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) {
633 return -1;
634 }
635
636verify:
637 switch (etool.speed) {
638 case SPEED_10:
639 case SPEED_100:
640 case SPEED_1000:
94dbffd5 641 case SPEED_10000:
1da177e4
LT		 642 break;
643 default:
644 return -1;
645 }
646
647 switch (etool.duplex) {
648 case DUPLEX_FULL:
649 case DUPLEX_HALF:
650 break;
651 default:
652 return -1;
653 }
654
655 slave->speed = etool.speed;
656 slave->duplex = etool.duplex;
657
658 return 0;
659}
660
661/*
662 * if <dev> supports MII link status reporting, check its link status.
663 *
664 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
665 * depening upon the setting of the use_carrier parameter.
666 *
667 * Return either BMSR_LSTATUS, meaning that the link is up (or we
668 * can't tell and just pretend it is), or 0, meaning that the link is
669 * down.
670 *
671 * If reporting is non-zero, instead of faking link up, return -1 if
672 * both ETHTOOL and MII ioctls fail (meaning the device does not
673 * support them). If use_carrier is set, return whatever it says.
674 * It'd be nice if there was a good way to tell if a driver supports
675 * netif_carrier, but there really isn't.
676 */
677static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
678{
679 static int (* ioctl)(struct net_device *, struct ifreq *, int);
680 struct ifreq ifr;
681 struct mii_ioctl_data *mii;
682 struct ethtool_value etool;
683
684 if (bond->params.use_carrier) {
685 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
686 }
687
688 ioctl = slave_dev->do_ioctl;
689 if (ioctl) {
690 /* TODO: set pointer to correct ioctl on a per team member */
691 /* bases to make this more efficient. that is, once */
692 /* we determine the correct ioctl, we will always */
693 /* call it and not the others for that team */
694 /* member. */
695
696 /*
697 * We cannot assume that SIOCGMIIPHY will also read a
698 * register; not all network drivers (e.g., e100)
699 * support that.
700 */
701
702 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
703 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
704 mii = if_mii(&ifr);
705 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
706 mii->reg_num = MII_BMSR;
707 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
708 return (mii->val_out & BMSR_LSTATUS);
709 }
710 }
711 }
712
713 /* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */
714 /* for a period of time so we attempt to get link status */
715 /* from it last if the above MII ioctls fail... */
716 if (slave_dev->ethtool_ops) {
717 if (slave_dev->ethtool_ops->get_link) {
718 u32 link;
719
720 link = slave_dev->ethtool_ops->get_link(slave_dev);
721
722 return link ? BMSR_LSTATUS : 0;
723 }
724 }
725
726 if (ioctl) {
727 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
728 etool.cmd = ETHTOOL_GLINK;
729 ifr.ifr_data = (char*)&etool;
730 if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) {
731 if (etool.data == 1) {
732 return BMSR_LSTATUS;
733 } else {
734 dprintk("SIOCETHTOOL shows link down\n");
735 return 0;
736 }
737 }
738 }
739
740 /*
741 * If reporting, report that either there's no dev->do_ioctl,
742 * or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we
743 * cannot report link status). If not reporting, pretend
744 * we're ok.
745 */
746 return (reporting ? -1 : BMSR_LSTATUS);
747}
748
749/*----------------------------- Multicast list ------------------------------*/
750
751/*
752 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
753 */
754static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
755{
756 return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
757 dmi1->dmi_addrlen == dmi2->dmi_addrlen;
758}
759
760/*
761 * returns dmi entry if found, NULL otherwise
762 */
763static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
764{
765 struct dev_mc_list *idmi;
766
767 for (idmi = mc_list; idmi; idmi = idmi->next) {
768 if (bond_is_dmi_same(dmi, idmi)) {
769 return idmi;
770 }
771 }
772
773 return NULL;
774}
775
776/*
777 * Push the promiscuity flag down to appropriate slaves
778 */
779static void bond_set_promiscuity(struct bonding *bond, int inc)
780{
781 if (USES_PRIMARY(bond->params.mode)) {
782 /* write lock already acquired */
783 if (bond->curr_active_slave) {
784 dev_set_promiscuity(bond->curr_active_slave->dev, inc);
785 }
786 } else {
787 struct slave *slave;
788 int i;
789 bond_for_each_slave(bond, slave, i) {
790 dev_set_promiscuity(slave->dev, inc);
791 }
792 }
793}
794
795/*
796 * Push the allmulti flag down to all slaves
797 */
798static void bond_set_allmulti(struct bonding *bond, int inc)
799{
800 if (USES_PRIMARY(bond->params.mode)) {
801 /* write lock already acquired */
802 if (bond->curr_active_slave) {
803 dev_set_allmulti(bond->curr_active_slave->dev, inc);
804 }
805 } else {
806 struct slave *slave;
807 int i;
808 bond_for_each_slave(bond, slave, i) {
809 dev_set_allmulti(slave->dev, inc);
810 }
811 }
812}
813
814/*
815 * Add a Multicast address to slaves
816 * according to mode
817 */
818static void bond_mc_add(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_add(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_add(slave->dev, addr, alen, 0);
830 }
831 }
832}
833
834/*
835 * Remove a multicast address from slave
836 * according to mode
837 */
838static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
839{
840 if (USES_PRIMARY(bond->params.mode)) {
841 /* write lock already acquired */
842 if (bond->curr_active_slave) {
843 dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
844 }
845 } else {
846 struct slave *slave;
847 int i;
848 bond_for_each_slave(bond, slave, i) {
849 dev_mc_delete(slave->dev, addr, alen, 0);
850 }
851 }
852}
853
854/*
855 * Totally destroys the mc_list in bond
856 */
857static void bond_mc_list_destroy(struct bonding *bond)
858{
859 struct dev_mc_list *dmi;
860
861 dmi = bond->mc_list;
862 while (dmi) {
863 bond->mc_list = dmi->next;
864 kfree(dmi);
865 dmi = bond->mc_list;
866 }
867}
868
869/*
870 * Copy all the Multicast addresses from src to the bonding device dst
871 */
de54f390 872static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
dd0fc66f 873 gfp_t gfp_flag)
1da177e4
LT		 874{
875 struct dev_mc_list *dmi, *new_dmi;
876
877 for (dmi = mc_list; dmi; dmi = dmi->next) {
de54f390 878 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
1da177e4
LT		 879
880 if (!new_dmi) {
881 /* FIXME: Potential memory leak !!! */
882 return -ENOMEM;
883 }
884
885 new_dmi->next = bond->mc_list;
886 bond->mc_list = new_dmi;
887 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
888 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
889 new_dmi->dmi_users = dmi->dmi_users;
890 new_dmi->dmi_gusers = dmi->dmi_gusers;
891 }
892
893 return 0;
894}
895
896/*
897 * flush all members of flush->mc_list from device dev->mc_list
898 */
899static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
900{
901 struct bonding *bond = bond_dev->priv;
902 struct dev_mc_list *dmi;
903
904 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
905 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
906 }
907
908 if (bond->params.mode == BOND_MODE_8023AD) {
909 /* del lacpdu mc addr from mc list */
910 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
911
912 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
913 }
914}
915
916/*--------------------------- Active slave change ---------------------------*/
917
918/*
919 * Update the mc list and multicast-related flags for the new and
920 * old active slaves (if any) according to the multicast mode, and
921 * promiscuous flags unconditionally.
922 */
923static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
924{
925 struct dev_mc_list *dmi;
926
927 if (!USES_PRIMARY(bond->params.mode)) {
928 /* nothing to do - mc list is already up-to-date on
929 * all slaves
930 */
931 return;
932 }
933
934 if (old_active) {
935 if (bond->dev->flags & IFF_PROMISC) {
936 dev_set_promiscuity(old_active->dev, -1);
937 }
938
939 if (bond->dev->flags & IFF_ALLMULTI) {
940 dev_set_allmulti(old_active->dev, -1);
941 }
942
943 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
944 dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
945 }
946 }
947
948 if (new_active) {
949 if (bond->dev->flags & IFF_PROMISC) {
950 dev_set_promiscuity(new_active->dev, 1);
951 }
952
953 if (bond->dev->flags & IFF_ALLMULTI) {
954 dev_set_allmulti(new_active->dev, 1);
955 }
956
957 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
958 dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
959 }
960 }
961}
962
963/**
964 * find_best_interface - select the best available slave to be the active one
965 * @bond: our bonding struct
966 *
967 * Warning: Caller must hold curr_slave_lock for writing.
968 */
969static struct slave *bond_find_best_slave(struct bonding *bond)
970{
971 struct slave *new_active, *old_active;
972 struct slave *bestslave = NULL;
973 int mintime = bond->params.updelay;
974 int i;
975
976 new_active = old_active = bond->curr_active_slave;
977
978 if (!new_active) { /* there were no active slaves left */
979 if (bond->slave_cnt > 0) { /* found one slave */
980 new_active = bond->first_slave;
981 } else {
982 return NULL; /* still no slave, return NULL */
983 }
984 }
985
986 /* first try the primary link; if arping, a link must tx/rx traffic
987 * before it can be considered the curr_active_slave - also, we would skip
988 * slaves between the curr_active_slave and primary_slave that may be up
989 * and able to arp
990 */
991 if ((bond->primary_slave) &&
992 (!bond->params.arp_interval) &&
993 (IS_UP(bond->primary_slave->dev))) {
994 new_active = bond->primary_slave;
995 }
996
997 /* remember where to stop iterating over the slaves */
998 old_active = new_active;
999
1000 bond_for_each_slave_from(bond, new_active, i, old_active) {
1001 if (IS_UP(new_active->dev)) {
1002 if (new_active->link == BOND_LINK_UP) {
1003 return new_active;
1004 } else if (new_active->link == BOND_LINK_BACK) {
1005 /* link up, but waiting for stabilization */
1006 if (new_active->delay < mintime) {
1007 mintime = new_active->delay;
1008 bestslave = new_active;
1009 }
1010 }
1011 }
1012 }
1013
1014 return bestslave;
1015}
1016
1017/**
1018 * change_active_interface - change the active slave into the specified one
1019 * @bond: our bonding struct
1020 * @new: the new slave to make the active one
1021 *
1022 * Set the new slave to the bond's settings and unset them on the old
1023 * curr_active_slave.
1024 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1025 *
1026 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1027 * because it is apparently the best available slave we have, even though its
1028 * updelay hasn't timed out yet.
1029 *
1030 * Warning: Caller must hold curr_slave_lock for writing.
1031 */
a77b5325 1032void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1da177e4
LT		 1033{
1034 struct slave *old_active = bond->curr_active_slave;
1035
1036 if (old_active == new_active) {
1037 return;
1038 }
1039
1040 if (new_active) {
1041 if (new_active->link == BOND_LINK_BACK) {
1042 if (USES_PRIMARY(bond->params.mode)) {
1043 printk(KERN_INFO DRV_NAME
1044 ": %s: making interface %s the new "
1045 "active one %d ms earlier.\n",
1046 bond->dev->name, new_active->dev->name,
1047 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1048 }
1049
1050 new_active->delay = 0;
1051 new_active->link = BOND_LINK_UP;
1052 new_active->jiffies = jiffies;
1053
1054 if (bond->params.mode == BOND_MODE_8023AD) {
1055 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1056 }
1057
1058 if ((bond->params.mode == BOND_MODE_TLB) ||
1059 (bond->params.mode == BOND_MODE_ALB)) {
1060 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1061 }
1062 } else {
1063 if (USES_PRIMARY(bond->params.mode)) {
1064 printk(KERN_INFO DRV_NAME
1065 ": %s: making interface %s the new "
1066 "active one.\n",
1067 bond->dev->name, new_active->dev->name);
1068 }
1069 }
1070 }
1071
1da177e4
LT		 1072 if (USES_PRIMARY(bond->params.mode)) {
1073 bond_mc_swap(bond, new_active, old_active);
1074 }
1075
1076 if ((bond->params.mode == BOND_MODE_TLB) ||
1077 (bond->params.mode == BOND_MODE_ALB)) {
1078 bond_alb_handle_active_change(bond, new_active);
8f903c70
JV		 1079 if (old_active)
1080 bond_set_slave_inactive_flags(old_active);
1081 if (new_active)
1082 bond_set_slave_active_flags(new_active);
1da177e4
LT		 1083 } else {
1084 bond->curr_active_slave = new_active;
1085 }
c3ade5ca
JV		 1086
1087 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1088 if (old_active) {
1089 bond_set_slave_inactive_flags(old_active);
1090 }
1091
1092 if (new_active) {
1093 bond_set_slave_active_flags(new_active);
1094 }
1095 bond_send_gratuitous_arp(bond);
1096 }
1da177e4
LT		 1097}
1098
1099/**
1100 * bond_select_active_slave - select a new active slave, if needed
1101 * @bond: our bonding struct
1102 *
1103 * This functions shoud be called when one of the following occurs:
1104 * - The old curr_active_slave has been released or lost its link.
1105 * - The primary_slave has got its link back.
1106 * - A slave has got its link back and there's no old curr_active_slave.
1107 *
1108 * Warning: Caller must hold curr_slave_lock for writing.
1109 */
a77b5325 1110void bond_select_active_slave(struct bonding *bond)
1da177e4
LT		 1111{
1112 struct slave *best_slave;
ff59c456 1113 int rv;
1da177e4
LT		 1114
1115 best_slave = bond_find_best_slave(bond);
1116 if (best_slave != bond->curr_active_slave) {
1117 bond_change_active_slave(bond, best_slave);
ff59c456
JV		 1118 rv = bond_set_carrier(bond);
1119 if (!rv)
1120 return;
1121
1122 if (netif_carrier_ok(bond->dev)) {
1123 printk(KERN_INFO DRV_NAME
1124 ": %s: first active interface up!\n",
1125 bond->dev->name);
1126 } else {
1127 printk(KERN_INFO DRV_NAME ": %s: "
1128 "now running without any active interface !\n",
1129 bond->dev->name);
1130 }
1da177e4
LT		 1131 }
1132}
1133
1134/*--------------------------- slave list handling ---------------------------*/
1135
1136/*
1137 * This function attaches the slave to the end of list.
1138 *
1139 * bond->lock held for writing by caller.
1140 */
1141static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1142{
1143 if (bond->first_slave == NULL) { /* attaching the first slave */
1144 new_slave->next = new_slave;
1145 new_slave->prev = new_slave;
1146 bond->first_slave = new_slave;
1147 } else {
1148 new_slave->next = bond->first_slave;
1149 new_slave->prev = bond->first_slave->prev;
1150 new_slave->next->prev = new_slave;
1151 new_slave->prev->next = new_slave;
1152 }
1153
1154 bond->slave_cnt++;
1155}
1156
1157/*
1158 * This function detaches the slave from the list.
1159 * WARNING: no check is made to verify if the slave effectively
1160 * belongs to <bond>.
1161 * Nothing is freed on return, structures are just unchained.
1162 * If any slave pointer in bond was pointing to <slave>,
1163 * it should be changed by the calling function.
1164 *
1165 * bond->lock held for writing by caller.
1166 */
1167static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1168{
1169 if (slave->next) {
1170 slave->next->prev = slave->prev;
1171 }
1172
1173 if (slave->prev) {
1174 slave->prev->next = slave->next;
1175 }
1176
1177 if (bond->first_slave == slave) { /* slave is the first slave */
1178 if (bond->slave_cnt > 1) { /* there are more slave */
1179 bond->first_slave = slave->next;
1180 } else {
1181 bond->first_slave = NULL; /* slave was the last one */
1182 }
1183 }
1184
1185 slave->next = NULL;
1186 slave->prev = NULL;
1187 bond->slave_cnt--;
1188}
1189
1190/*---------------------------------- IOCTL ----------------------------------*/
1191
a77b5325 1192int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1193{
1194 dprintk("bond_dev=%p\n", bond_dev);
1195 dprintk("slave_dev=%p\n", slave_dev);
1196 dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1197 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1198 return 0;
1199}
1200
8531c5ff 1201#define BOND_INTERSECT_FEATURES \
8648b305 1202 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_TSO | NETIF_F_UFO)
8531c5ff
AK		 1203
1204/*
8e3babcd
JV		 1205 * Compute the common dev->feature set available to all slaves. Some
1206 * feature bits are managed elsewhere, so preserve feature bits set on
1207 * master device that are not part of the examined set.
8531c5ff
AK		 1208 */
1209static int bond_compute_features(struct bonding *bond)
1210{
8e3babcd 1211 unsigned long features = BOND_INTERSECT_FEATURES;
8531c5ff
AK		 1212 struct slave *slave;
1213 struct net_device *bond_dev = bond->dev;
54ef3137 1214 unsigned short max_hard_header_len = ETH_HLEN;
8e3babcd 1215 int i;
8531c5ff 1216
54ef3137 1217 bond_for_each_slave(bond, slave, i) {
8e3babcd 1218 features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
54ef3137
JV		 1219 if (slave->dev->hard_header_len > max_hard_header_len)
1220 max_hard_header_len = slave->dev->hard_header_len;
1221 }
8531c5ff 1222
8531c5ff 1223 if ((features & NETIF_F_SG) &&
8648b305 1224 !(features & NETIF_F_ALL_CSUM))
8531c5ff 1225 features &= ~NETIF_F_SG;
8531c5ff 1226
a0de3adf
JV		 1227 /*
1228 * features will include NETIF_F_TSO (NETIF_F_UFO) iff all
1229 * slave devices support NETIF_F_TSO (NETIF_F_UFO), which
1230 * implies that all slaves also support scatter-gather
1231 * (NETIF_F_SG), which implies that features also includes
1232 * NETIF_F_SG. So no need to check whether we have an
1233 * illegal combination of NETIF_F_{TSO,UFO} and
1234 * !NETIF_F_SG
1235 */
1236
8e3babcd 1237 features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
8531c5ff 1238 bond_dev->features = features;
54ef3137 1239 bond_dev->hard_header_len = max_hard_header_len;
8531c5ff
AK		 1240
1241 return 0;
1242}
1243
1da177e4 1244/* enslave device <slave> to bond device <master> */
a77b5325 1245int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1246{
1247 struct bonding *bond = bond_dev->priv;
1248 struct slave *new_slave = NULL;
1249 struct dev_mc_list *dmi;
1250 struct sockaddr addr;
1251 int link_reporting;
1252 int old_features = bond_dev->features;
1253 int res = 0;
1254
552709d5 1255 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1256 slave_dev->do_ioctl == NULL) {
1da177e4 1257 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1258 ": %s: Warning: no link monitoring support for %s\n",
1259 bond_dev->name, slave_dev->name);
1da177e4
LT		 1260 }
1261
1262 /* bond must be initialized by bond_open() before enslaving */
1263 if (!(bond_dev->flags & IFF_UP)) {
1264 dprintk("Error, master_dev is not up\n");
1265 return -EPERM;
1266 }
1267
1268 /* already enslaved */
1269 if (slave_dev->flags & IFF_SLAVE) {
1270 dprintk("Error, Device was already enslaved\n");
1271 return -EBUSY;
1272 }
1273
1274 /* vlan challenged mutual exclusion */
1275 /* no need to lock since we're protected by rtnl_lock */
1276 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1277 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1278 if (!list_empty(&bond->vlan_list)) {
1279 printk(KERN_ERR DRV_NAME
4e0952c7 1280 ": %s: Error: cannot enslave VLAN "
1da177e4 1281 "challenged slave %s on VLAN enabled "
4e0952c7 1282 "bond %s\n", bond_dev->name, slave_dev->name,
1da177e4
LT		 1283 bond_dev->name);
1284 return -EPERM;
1285 } else {
1286 printk(KERN_WARNING DRV_NAME
4e0952c7 1287 ": %s: Warning: enslaved VLAN challenged "
1da177e4
LT		 1288 "slave %s. Adding VLANs will be blocked as "
1289 "long as %s is part of bond %s\n",
4e0952c7 1290 bond_dev->name, slave_dev->name, slave_dev->name,
1da177e4
LT		 1291 bond_dev->name);
1292 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1293 }
1294 } else {
1295 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1296 if (bond->slave_cnt == 0) {
1297 /* First slave, and it is not VLAN challenged,
1298 * so remove the block of adding VLANs over the bond.
1299 */
1300 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1301 }
1302 }
1303
217df670
JV		 1304 /*
1305 * Old ifenslave binaries are no longer supported. These can
1306 * be identified with moderate accurary by the state of the slave:
1307 * the current ifenslave will set the interface down prior to
1308 * enslaving it; the old ifenslave will not.
1309 */
1310 if ((slave_dev->flags & IFF_UP)) {
1311 printk(KERN_ERR DRV_NAME ": %s is up. "
1312 "This may be due to an out of date ifenslave.\n",
1313 slave_dev->name);
1314 res = -EPERM;
1315 goto err_undo_flags;
1316 }
1da177e4 1317
217df670
JV		 1318 if (slave_dev->set_mac_address == NULL) {
1319 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 1320 ": %s: Error: The slave device you specified does "
1321 "not support setting the MAC address. "
1322 "Your kernel likely does not support slave "
1323 "devices.\n", bond_dev->name);
1324 res = -EOPNOTSUPP;
217df670 1325 goto err_undo_flags;
1da177e4
LT		 1326 }
1327
1328 new_slave = kmalloc(sizeof(struct slave), GFP_KERNEL);
1329 if (!new_slave) {
1330 res = -ENOMEM;
1331 goto err_undo_flags;
1332 }
1333
1334 memset(new_slave, 0, sizeof(struct slave));
1335
1336 /* save slave's original flags before calling
1337 * netdev_set_master and dev_open
1338 */
1339 new_slave->original_flags = slave_dev->flags;
1340
217df670
JV		 1341 /*
1342 * Save slave's original ("permanent") mac address for modes
1343 * that need it, and for restoring it upon release, and then
1344 * set it to the master's address
1345 */
1346 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1da177e4 1347
217df670
JV		 1348 /*
1349 * Set slave to master's mac address. The application already
1350 * set the master's mac address to that of the first slave
1351 */
1352 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1353 addr.sa_family = slave_dev->type;
1354 res = dev_set_mac_address(slave_dev, &addr);
1355 if (res) {
1356 dprintk("Error %d calling set_mac_address\n", res);
1357 goto err_free;
1358 }
1da177e4 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
1367 res = netdev_set_master(slave_dev, bond_dev);
1368 if (res) {
1369 dprintk("Error %d calling netdev_set_master\n", res);
217df670 1370 goto err_close;
1da177e4
LT		 1371 }
1372
1373 new_slave->dev = slave_dev;
0b680e75 1374 slave_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 1375
1376 if ((bond->params.mode == BOND_MODE_TLB) ||
1377 (bond->params.mode == BOND_MODE_ALB)) {
1378 /* bond_alb_init_slave() must be called before all other stages since
1379 * it might fail and we do not want to have to undo everything
1380 */
1381 res = bond_alb_init_slave(bond, new_slave);
1382 if (res) {
1383 goto err_unset_master;
1384 }
1385 }
1386
1387 /* If the mode USES_PRIMARY, then the new slave gets the
1388 * master's promisc (and mc) settings only if it becomes the
1389 * curr_active_slave, and that is taken care of later when calling
1390 * bond_change_active()
1391 */
1392 if (!USES_PRIMARY(bond->params.mode)) {
1393 /* set promiscuity level to new slave */
1394 if (bond_dev->flags & IFF_PROMISC) {
1395 dev_set_promiscuity(slave_dev, 1);
1396 }
1397
1398 /* set allmulti level to new slave */
1399 if (bond_dev->flags & IFF_ALLMULTI) {
1400 dev_set_allmulti(slave_dev, 1);
1401 }
1402
1403 /* upload master's mc_list to new slave */
1404 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1405 dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1406 }
1407 }
1408
1409 if (bond->params.mode == BOND_MODE_8023AD) {
1410 /* add lacpdu mc addr to mc list */
1411 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1412
1413 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1414 }
1415
1416 bond_add_vlans_on_slave(bond, slave_dev);
1417
1418 write_lock_bh(&bond->lock);
1419
1420 bond_attach_slave(bond, new_slave);
1421
1422 new_slave->delay = 0;
1423 new_slave->link_failure_count = 0;
1424
8531c5ff
AK		 1425 bond_compute_features(bond);
1426
1da177e4
LT		 1427 if (bond->params.miimon && !bond->params.use_carrier) {
1428 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1429
1430 if ((link_reporting == -1) && !bond->params.arp_interval) {
1431 /*
1432 * miimon is set but a bonded network driver
1433 * does not support ETHTOOL/MII and
1434 * arp_interval is not set. Note: if
1435 * use_carrier is enabled, we will never go
1436 * here (because netif_carrier is always
1437 * supported); thus, we don't need to change
1438 * the messages for netif_carrier.
1439 */
1440 printk(KERN_WARNING DRV_NAME
4e0952c7 1441 ": %s: Warning: MII and ETHTOOL support not "
1da177e4
LT		 1442 "available for interface %s, and "
1443 "arp_interval/arp_ip_target module parameters "
1444 "not specified, thus bonding will not detect "
1445 "link failures! see bonding.txt for details.\n",
4e0952c7 1446 bond_dev->name, slave_dev->name);
1da177e4
LT		 1447 } else if (link_reporting == -1) {
1448 /* unable get link status using mii/ethtool */
1449 printk(KERN_WARNING DRV_NAME
4e0952c7 1450 ": %s: Warning: can't get link status from "
1da177e4
LT		 1451 "interface %s; the network driver associated "
1452 "with this interface does not support MII or "
1453 "ETHTOOL link status reporting, thus miimon "
1454 "has no effect on this interface.\n",
4e0952c7 1455 bond_dev->name, slave_dev->name);
1da177e4
LT		 1456 }
1457 }
1458
1459 /* check for initial state */
1460 if (!bond->params.miimon ||
1461 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1462 if (bond->params.updelay) {
1463 dprintk("Initial state of slave_dev is "
1464 "BOND_LINK_BACK\n");
1465 new_slave->link = BOND_LINK_BACK;
1466 new_slave->delay = bond->params.updelay;
1467 } else {
1468 dprintk("Initial state of slave_dev is "
1469 "BOND_LINK_UP\n");
1470 new_slave->link = BOND_LINK_UP;
1471 }
1472 new_slave->jiffies = jiffies;
1473 } else {
1474 dprintk("Initial state of slave_dev is "
1475 "BOND_LINK_DOWN\n");
1476 new_slave->link = BOND_LINK_DOWN;
1477 }
1478
1479 if (bond_update_speed_duplex(new_slave) &&
1480 (new_slave->link != BOND_LINK_DOWN)) {
1481 printk(KERN_WARNING DRV_NAME
4e0952c7 1482 ": %s: Warning: failed to get speed and duplex from %s, "
1da177e4 1483 "assumed to be 100Mb/sec and Full.\n",
4e0952c7 1484 bond_dev->name, new_slave->dev->name);
1da177e4
LT		 1485
1486 if (bond->params.mode == BOND_MODE_8023AD) {
4e0952c7
MW		 1487 printk(KERN_WARNING DRV_NAME
1488 ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1da177e4 1489 "support in base driver for proper aggregator "
4e0952c7 1490 "selection.\n", bond_dev->name);
1da177e4
LT		 1491 }
1492 }
1493
1494 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1495 /* if there is a primary slave, remember it */
1496 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1497 bond->primary_slave = new_slave;
1498 }
1499 }
1500
1501 switch (bond->params.mode) {
1502 case BOND_MODE_ACTIVEBACKUP:
8f903c70
JV		 1503 /* if we're in active-backup mode, we need one and
1504 * only one active interface. The backup interfaces
1505 * will have their SLAVE_INACTIVE flag set because we
1506 * need them to be drop all packets. Thus, since we
1507 * guarantee that curr_active_slave always point to
1508 * the last usable interface, we just have to verify
1509 * this interface's flag.
1da177e4
LT		 1510 */
1511 if (((!bond->curr_active_slave) ||
8f903c70 1512 (bond->curr_active_slave->dev->priv_flags & IFF_SLAVE_INACTIVE)) &&
1da177e4 1513 (new_slave->link != BOND_LINK_DOWN)) {
1da177e4
LT		 1514 /* first slave or no active slave yet, and this link
1515 is OK, so make this interface the active one */
1516 bond_change_active_slave(bond, new_slave);
ff59c456
JV		 1517 printk(KERN_INFO DRV_NAME
1518 ": %s: first active interface up!\n",
1519 bond->dev->name);
1520 netif_carrier_on(bond->dev);
1521
1da177e4
LT		 1522 } else {
1523 dprintk("This is just a backup slave\n");
1524 bond_set_slave_inactive_flags(new_slave);
1525 }
1526 break;
1527 case BOND_MODE_8023AD:
1528 /* in 802.3ad mode, the internal mechanism
1529 * will activate the slaves in the selected
1530 * aggregator
1531 */
1532 bond_set_slave_inactive_flags(new_slave);
1533 /* if this is the first slave */
1534 if (bond->slave_cnt == 1) {
1535 SLAVE_AD_INFO(new_slave).id = 1;
1536 /* Initialize AD with the number of times that the AD timer is called in 1 second
1537 * can be called only after the mac address of the bond is set
1538 */
1539 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1540 bond->params.lacp_fast);
1541 } else {
1542 SLAVE_AD_INFO(new_slave).id =
1543 SLAVE_AD_INFO(new_slave->prev).id + 1;
1544 }
1545
1546 bond_3ad_bind_slave(new_slave);
1547 break;
1548 case BOND_MODE_TLB:
1549 case BOND_MODE_ALB:
1550 new_slave->state = BOND_STATE_ACTIVE;
1551 if ((!bond->curr_active_slave) &&
1552 (new_slave->link != BOND_LINK_DOWN)) {
1553 /* first slave or no active slave yet, and this link
1554 * is OK, so make this interface the active one
1555 */
1556 bond_change_active_slave(bond, new_slave);
8f903c70
JV		 1557 } else {
1558 bond_set_slave_inactive_flags(new_slave);
1da177e4
LT		 1559 }
1560 break;
1561 default:
1562 dprintk("This slave is always active in trunk mode\n");
1563
1564 /* always active in trunk mode */
1565 new_slave->state = BOND_STATE_ACTIVE;
1566
1567 /* In trunking mode there is little meaning to curr_active_slave
1568 * anyway (it holds no special properties of the bond device),
1569 * so we can change it without calling change_active_interface()
1570 */
1571 if (!bond->curr_active_slave) {
1572 bond->curr_active_slave = new_slave;
1573 }
1574 break;
1575 } /* switch(bond_mode) */
1576
ff59c456
JV		 1577 bond_set_carrier(bond);
1578
1da177e4
LT		 1579 write_unlock_bh(&bond->lock);
1580
b76cdba9
MW		 1581 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1582 if (res)
1583 goto err_unset_master;
1584
1da177e4
LT		 1585 printk(KERN_INFO DRV_NAME
1586 ": %s: enslaving %s as a%s interface with a%s link.\n",
1587 bond_dev->name, slave_dev->name,
1588 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1589 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1590
1591 /* enslave is successful */
1592 return 0;
1593
1594/* Undo stages on error */
1595err_unset_master:
1596 netdev_set_master(slave_dev, NULL);
1597
1598err_close:
1599 dev_close(slave_dev);
1600
1601err_restore_mac:
1602 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1603 addr.sa_family = slave_dev->type;
1604 dev_set_mac_address(slave_dev, &addr);
1605
1606err_free:
1607 kfree(new_slave);
1608
1609err_undo_flags:
1610 bond_dev->features = old_features;
8531c5ff 1611
1da177e4
LT		 1612 return res;
1613}
1614
1615/*
1616 * Try to release the slave device <slave> from the bond device <master>
1617 * It is legal to access curr_active_slave without a lock because all the function
1618 * is write-locked.
1619 *
1620 * The rules for slave state should be:
1621 * for Active/Backup:
1622 * Active stays on all backups go down
1623 * for Bonded connections:
1624 * The first up interface should be left on and all others downed.
1625 */
a77b5325 1626int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1627{
1628 struct bonding *bond = bond_dev->priv;
1629 struct slave *slave, *oldcurrent;
1630 struct sockaddr addr;
1631 int mac_addr_differ;
1632
1633 /* slave is not a slave or master is not master of this slave */
1634 if (!(slave_dev->flags & IFF_SLAVE) ||
1635 (slave_dev->master != bond_dev)) {
1636 printk(KERN_ERR DRV_NAME
4e0952c7 1637 ": %s: Error: cannot release %s.\n",
1da177e4
LT		 1638 bond_dev->name, slave_dev->name);
1639 return -EINVAL;
1640 }
1641
1642 write_lock_bh(&bond->lock);
1643
1644 slave = bond_get_slave_by_dev(bond, slave_dev);
1645 if (!slave) {
1646 /* not a slave of this bond */
1647 printk(KERN_INFO DRV_NAME
1648 ": %s: %s not enslaved\n",
1649 bond_dev->name, slave_dev->name);
f5e2a7b2 1650 write_unlock_bh(&bond->lock);
1da177e4
LT		 1651 return -EINVAL;
1652 }
1653
1654 mac_addr_differ = memcmp(bond_dev->dev_addr,
1655 slave->perm_hwaddr,
1656 ETH_ALEN);
1657 if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1658 printk(KERN_WARNING DRV_NAME
4e0952c7 1659 ": %s: Warning: the permanent HWaddr of %s "
1da177e4
LT		 1660 "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1661 "still in use by %s. Set the HWaddr of "
1662 "%s to a different address to avoid "
1663 "conflicts.\n",
4e0952c7 1664 bond_dev->name,
1da177e4
LT		 1665 slave_dev->name,
1666 slave->perm_hwaddr[0],
1667 slave->perm_hwaddr[1],
1668 slave->perm_hwaddr[2],
1669 slave->perm_hwaddr[3],
1670 slave->perm_hwaddr[4],
1671 slave->perm_hwaddr[5],
1672 bond_dev->name,
1673 slave_dev->name);
1674 }
1675
1676 /* Inform AD package of unbinding of slave. */
1677 if (bond->params.mode == BOND_MODE_8023AD) {
1678 /* must be called before the slave is
1679 * detached from the list
1680 */
1681 bond_3ad_unbind_slave(slave);
1682 }
1683
1684 printk(KERN_INFO DRV_NAME
1685 ": %s: releasing %s interface %s\n",
1686 bond_dev->name,
1687 (slave->state == BOND_STATE_ACTIVE)
1688 ? "active" : "backup",
1689 slave_dev->name);
1690
1691 oldcurrent = bond->curr_active_slave;
1692
1693 bond->current_arp_slave = NULL;
1694
1695 /* release the slave from its bond */
1696 bond_detach_slave(bond, slave);
1697
8531c5ff
AK		 1698 bond_compute_features(bond);
1699
1da177e4
LT		 1700 if (bond->primary_slave == slave) {
1701 bond->primary_slave = NULL;
1702 }
1703
1704 if (oldcurrent == slave) {
1705 bond_change_active_slave(bond, NULL);
1706 }
1707
1708 if ((bond->params.mode == BOND_MODE_TLB) ||
1709 (bond->params.mode == BOND_MODE_ALB)) {
1710 /* Must be called only after the slave has been
1711 * detached from the list and the curr_active_slave
1712 * has been cleared (if our_slave == old_current),
1713 * but before a new active slave is selected.
1714 */
1715 bond_alb_deinit_slave(bond, slave);
1716 }
1717
ff59c456 1718 if (oldcurrent == slave)
1da177e4
LT		 1719 bond_select_active_slave(bond);
1720
1da177e4 1721 if (bond->slave_cnt == 0) {
ff59c456
JV		 1722 bond_set_carrier(bond);
1723
1da177e4
LT		 1724 /* if the last slave was removed, zero the mac address
1725 * of the master so it will be set by the application
1726 * to the mac address of the first slave
1727 */
1728 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1729
1730 if (list_empty(&bond->vlan_list)) {
1731 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1732 } else {
1733 printk(KERN_WARNING DRV_NAME
4e0952c7 1734 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1735 "still has VLANs.\n",
4e0952c7 1736 bond_dev->name, bond_dev->name);
1da177e4 1737 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1738 ": %s: When re-adding slaves, make sure the bond's "
1739 "HW address matches its VLANs'.\n",
1740 bond_dev->name);
1da177e4
LT		 1741 }
1742 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1743 !bond_has_challenged_slaves(bond)) {
1744 printk(KERN_INFO DRV_NAME
4e0952c7 1745 ": %s: last VLAN challenged slave %s "
1da177e4 1746 "left bond %s. VLAN blocking is removed\n",
4e0952c7 1747 bond_dev->name, slave_dev->name, bond_dev->name);
1da177e4
LT		 1748 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1749 }
1750
1751 write_unlock_bh(&bond->lock);
1752
b76cdba9
MW		 1753 /* must do this from outside any spinlocks */
1754 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1755
1da177e4
LT		 1756 bond_del_vlans_from_slave(bond, slave_dev);
1757
1758 /* If the mode USES_PRIMARY, then we should only remove its
1759 * promisc and mc settings if it was the curr_active_slave, but that was
1760 * already taken care of above when we detached the slave
1761 */
1762 if (!USES_PRIMARY(bond->params.mode)) {
1763 /* unset promiscuity level from slave */
1764 if (bond_dev->flags & IFF_PROMISC) {
1765 dev_set_promiscuity(slave_dev, -1);
1766 }
1767
1768 /* unset allmulti level from slave */
1769 if (bond_dev->flags & IFF_ALLMULTI) {
1770 dev_set_allmulti(slave_dev, -1);
1771 }
1772
1773 /* flush master's mc_list from slave */
1774 bond_mc_list_flush(bond_dev, slave_dev);
1775 }
1776
1777 netdev_set_master(slave_dev, NULL);
1778
1779 /* close slave before restoring its mac address */
1780 dev_close(slave_dev);
1781
217df670
JV		 1782 /* restore original ("permanent") mac address */
1783 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1784 addr.sa_family = slave_dev->type;
1785 dev_set_mac_address(slave_dev, &addr);
1da177e4 1786
8f903c70 1787 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
0b680e75 1788 IFF_SLAVE_INACTIVE | IFF_BONDING);
1da177e4
LT		 1789
1790 kfree(slave);
1791
1792 return 0; /* deletion OK */
1793}
1794
1795/*
1796 * This function releases all slaves.
1797 */
1798static int bond_release_all(struct net_device *bond_dev)
1799{
1800 struct bonding *bond = bond_dev->priv;
1801 struct slave *slave;
1802 struct net_device *slave_dev;
1803 struct sockaddr addr;
1804
1805 write_lock_bh(&bond->lock);
1806
ff59c456
JV		 1807 netif_carrier_off(bond_dev);
1808
1da177e4
LT		 1809 if (bond->slave_cnt == 0) {
1810 goto out;
1811 }
1812
1813 bond->current_arp_slave = NULL;
1814 bond->primary_slave = NULL;
1815 bond_change_active_slave(bond, NULL);
1816
1817 while ((slave = bond->first_slave) != NULL) {
1818 /* Inform AD package of unbinding of slave
1819 * before slave is detached from the list.
1820 */
1821 if (bond->params.mode == BOND_MODE_8023AD) {
1822 bond_3ad_unbind_slave(slave);
1823 }
1824
1825 slave_dev = slave->dev;
1826 bond_detach_slave(bond, slave);
1827
1828 if ((bond->params.mode == BOND_MODE_TLB) ||
1829 (bond->params.mode == BOND_MODE_ALB)) {
1830 /* must be called only after the slave
1831 * has been detached from the list
1832 */
1833 bond_alb_deinit_slave(bond, slave);
1834 }
1835
8531c5ff
AK		 1836 bond_compute_features(bond);
1837
1da177e4
LT		 1838 /* now that the slave is detached, unlock and perform
1839 * all the undo steps that should not be called from
1840 * within a lock.
1841 */
1842 write_unlock_bh(&bond->lock);
1843
b76cdba9 1844 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1da177e4
LT		 1845 bond_del_vlans_from_slave(bond, slave_dev);
1846
1847 /* If the mode USES_PRIMARY, then we should only remove its
1848 * promisc and mc settings if it was the curr_active_slave, but that was
1849 * already taken care of above when we detached the slave
1850 */
1851 if (!USES_PRIMARY(bond->params.mode)) {
1852 /* unset promiscuity level from slave */
1853 if (bond_dev->flags & IFF_PROMISC) {
1854 dev_set_promiscuity(slave_dev, -1);
1855 }
1856
1857 /* unset allmulti level from slave */
1858 if (bond_dev->flags & IFF_ALLMULTI) {
1859 dev_set_allmulti(slave_dev, -1);
1860 }
1861
1862 /* flush master's mc_list from slave */
1863 bond_mc_list_flush(bond_dev, slave_dev);
1864 }
1865
1866 netdev_set_master(slave_dev, NULL);
1867
1868 /* close slave before restoring its mac address */
1869 dev_close(slave_dev);
1870
217df670
JV		 1871 /* restore original ("permanent") mac address*/
1872 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1873 addr.sa_family = slave_dev->type;
1874 dev_set_mac_address(slave_dev, &addr);
1da177e4 1875
8f903c70
JV		 1876 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1877 IFF_SLAVE_INACTIVE);
1da177e4
LT		 1878
1879 kfree(slave);
1880
1881 /* re-acquire the lock before getting the next slave */
1882 write_lock_bh(&bond->lock);
1883 }
1884
1885 /* zero the mac address of the master so it will be
1886 * set by the application to the mac address of the
1887 * first slave
1888 */
1889 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1890
1891 if (list_empty(&bond->vlan_list)) {
1892 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1893 } else {
1894 printk(KERN_WARNING DRV_NAME
4e0952c7 1895 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1896 "still has VLANs.\n",
4e0952c7 1897 bond_dev->name, bond_dev->name);
1da177e4 1898 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1899 ": %s: When re-adding slaves, make sure the bond's "
1900 "HW address matches its VLANs'.\n",
1901 bond_dev->name);
1da177e4
LT		 1902 }
1903
1904 printk(KERN_INFO DRV_NAME
1905 ": %s: released all slaves\n",
1906 bond_dev->name);
1907
1908out:
1909 write_unlock_bh(&bond->lock);
1910
1911 return 0;
1912}
1913
1914/*
1915 * This function changes the active slave to slave <slave_dev>.
1916 * It returns -EINVAL in the following cases.
1917 * - <slave_dev> is not found in the list.
1918 * - There is not active slave now.
1919 * - <slave_dev> is already active.
1920 * - The link state of <slave_dev> is not BOND_LINK_UP.
1921 * - <slave_dev> is not running.
1922 * In these cases, this fuction does nothing.
1923 * In the other cases, currnt_slave pointer is changed and 0 is returned.
1924 */
1925static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1926{
1927 struct bonding *bond = bond_dev->priv;
1928 struct slave *old_active = NULL;
1929 struct slave *new_active = NULL;
1930 int res = 0;
1931
1932 if (!USES_PRIMARY(bond->params.mode)) {
1933 return -EINVAL;
1934 }
1935
1936 /* Verify that master_dev is indeed the master of slave_dev */
1937 if (!(slave_dev->flags & IFF_SLAVE) ||
1938 (slave_dev->master != bond_dev)) {
1939 return -EINVAL;
1940 }
1941
1942 write_lock_bh(&bond->lock);
1943
1944 old_active = bond->curr_active_slave;
1945 new_active = bond_get_slave_by_dev(bond, slave_dev);
1946
1947 /*
1948 * Changing to the current active: do nothing; return success.
1949 */
1950 if (new_active && (new_active == old_active)) {
1951 write_unlock_bh(&bond->lock);
1952 return 0;
1953 }
1954
1955 if ((new_active) &&
1956 (old_active) &&
1957 (new_active->link == BOND_LINK_UP) &&
1958 IS_UP(new_active->dev)) {
1959 bond_change_active_slave(bond, new_active);
1960 } else {
1961 res = -EINVAL;
1962 }
1963
1964 write_unlock_bh(&bond->lock);
1965
1966 return res;
1967}
1968
1da177e4
LT		 1969static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1970{
1971 struct bonding *bond = bond_dev->priv;
1972
1973 info->bond_mode = bond->params.mode;
1974 info->miimon = bond->params.miimon;
1975
1976 read_lock_bh(&bond->lock);
1977 info->num_slaves = bond->slave_cnt;
1978 read_unlock_bh(&bond->lock);
1979
1980 return 0;
1981}
1982
1983static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1984{
1985 struct bonding *bond = bond_dev->priv;
1986 struct slave *slave;
1987 int i, found = 0;
1988
1989 if (info->slave_id < 0) {
1990 return -ENODEV;
1991 }
1992
1993 read_lock_bh(&bond->lock);
1994
1995 bond_for_each_slave(bond, slave, i) {
1996 if (i == (int)info->slave_id) {
1997 found = 1;
1998 break;
1999 }
2000 }
2001
2002 read_unlock_bh(&bond->lock);
2003
2004 if (found) {
2005 strcpy(info->slave_name, slave->dev->name);
2006 info->link = slave->link;
2007 info->state = slave->state;
2008 info->link_failure_count = slave->link_failure_count;
2009 } else {
2010 return -ENODEV;
2011 }
2012
2013 return 0;
2014}
2015
2016/*-------------------------------- Monitoring -------------------------------*/
2017
2018/* this function is called regularly to monitor each slave's link. */
a77b5325 2019void bond_mii_monitor(struct net_device *bond_dev)
1da177e4
LT		 2020{
2021 struct bonding *bond = bond_dev->priv;
2022 struct slave *slave, *oldcurrent;
2023 int do_failover = 0;
2024 int delta_in_ticks;
2025 int i;
2026
2027 read_lock(&bond->lock);
2028
2029 delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2030
2031 if (bond->kill_timers) {
2032 goto out;
2033 }
2034
2035 if (bond->slave_cnt == 0) {
2036 goto re_arm;
2037 }
2038
2039 /* we will try to read the link status of each of our slaves, and
2040 * set their IFF_RUNNING flag appropriately. For each slave not
2041 * supporting MII status, we won't do anything so that a user-space
2042 * program could monitor the link itself if needed.
2043 */
2044
2045 read_lock(&bond->curr_slave_lock);
2046 oldcurrent = bond->curr_active_slave;
2047 read_unlock(&bond->curr_slave_lock);
2048
2049 bond_for_each_slave(bond, slave, i) {
2050 struct net_device *slave_dev = slave->dev;
2051 int link_state;
2052 u16 old_speed = slave->speed;
2053 u8 old_duplex = slave->duplex;
2054
2055 link_state = bond_check_dev_link(bond, slave_dev, 0);
2056
2057 switch (slave->link) {
2058 case BOND_LINK_UP: /* the link was up */
2059 if (link_state == BMSR_LSTATUS) {
2060 /* link stays up, nothing more to do */
2061 break;
2062 } else { /* link going down */
2063 slave->link = BOND_LINK_FAIL;
2064 slave->delay = bond->params.downdelay;
2065
2066 if (slave->link_failure_count < UINT_MAX) {
2067 slave->link_failure_count++;
2068 }
2069
2070 if (bond->params.downdelay) {
2071 printk(KERN_INFO DRV_NAME
2072 ": %s: link status down for %s "
2073 "interface %s, disabling it in "
2074 "%d ms.\n",
2075 bond_dev->name,
2076 IS_UP(slave_dev)
2077 ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2078 ? ((slave == oldcurrent)
2079 ? "active " : "backup ")
2080 : "")
2081 : "idle ",
2082 slave_dev->name,
2083 bond->params.downdelay * bond->params.miimon);
2084 }
2085 }
2086 /* no break ! fall through the BOND_LINK_FAIL test to
2087 ensure proper action to be taken
2088 */
2089 case BOND_LINK_FAIL: /* the link has just gone down */
2090 if (link_state != BMSR_LSTATUS) {
2091 /* link stays down */
2092 if (slave->delay <= 0) {
2093 /* link down for too long time */
2094 slave->link = BOND_LINK_DOWN;
2095
2096 /* in active/backup mode, we must
2097 * completely disable this interface
2098 */
2099 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2100 (bond->params.mode == BOND_MODE_8023AD)) {
2101 bond_set_slave_inactive_flags(slave);
2102 }
2103
2104 printk(KERN_INFO DRV_NAME
2105 ": %s: link status definitely "
2106 "down for interface %s, "
2107 "disabling it\n",
2108 bond_dev->name,
2109 slave_dev->name);
2110
2111 /* notify ad that the link status has changed */
2112 if (bond->params.mode == BOND_MODE_8023AD) {
2113 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2114 }
2115
2116 if ((bond->params.mode == BOND_MODE_TLB) ||
2117 (bond->params.mode == BOND_MODE_ALB)) {
2118 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2119 }
2120
2121 if (slave == oldcurrent) {
2122 do_failover = 1;
2123 }
2124 } else {
2125 slave->delay--;
2126 }
2127 } else {
2128 /* link up again */
2129 slave->link = BOND_LINK_UP;
2130 slave->jiffies = jiffies;
2131 printk(KERN_INFO DRV_NAME
2132 ": %s: link status up again after %d "
2133 "ms for interface %s.\n",
2134 bond_dev->name,
2135 (bond->params.downdelay - slave->delay) * bond->params.miimon,
2136 slave_dev->name);
2137 }
2138 break;
2139 case BOND_LINK_DOWN: /* the link was down */
2140 if (link_state != BMSR_LSTATUS) {
2141 /* the link stays down, nothing more to do */
2142 break;
2143 } else { /* link going up */
2144 slave->link = BOND_LINK_BACK;
2145 slave->delay = bond->params.updelay;
2146
2147 if (bond->params.updelay) {
2148 /* if updelay == 0, no need to
2149 advertise about a 0 ms delay */
2150 printk(KERN_INFO DRV_NAME
2151 ": %s: link status up for "
2152 "interface %s, enabling it "
2153 "in %d ms.\n",
2154 bond_dev->name,
2155 slave_dev->name,
2156 bond->params.updelay * bond->params.miimon);
2157 }
2158 }
2159 /* no break ! fall through the BOND_LINK_BACK state in
2160 case there's something to do.
2161 */
2162 case BOND_LINK_BACK: /* the link has just come back */
2163 if (link_state != BMSR_LSTATUS) {
2164 /* link down again */
2165 slave->link = BOND_LINK_DOWN;
2166
2167 printk(KERN_INFO DRV_NAME
2168 ": %s: link status down again after %d "
2169 "ms for interface %s.\n",
2170 bond_dev->name,
2171 (bond->params.updelay - slave->delay) * bond->params.miimon,
2172 slave_dev->name);
2173 } else {
2174 /* link stays up */
2175 if (slave->delay == 0) {
2176 /* now the link has been up for long time enough */
2177 slave->link = BOND_LINK_UP;
2178 slave->jiffies = jiffies;
2179
2180 if (bond->params.mode == BOND_MODE_8023AD) {
2181 /* prevent it from being the active one */
2182 slave->state = BOND_STATE_BACKUP;
2183 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2184 /* make it immediately active */
2185 slave->state = BOND_STATE_ACTIVE;
2186 } else if (slave != bond->primary_slave) {
2187 /* prevent it from being the active one */
2188 slave->state = BOND_STATE_BACKUP;
2189 }
2190
2191 printk(KERN_INFO DRV_NAME
2192 ": %s: link status definitely "
2193 "up for interface %s.\n",
2194 bond_dev->name,
2195 slave_dev->name);
2196
2197 /* notify ad that the link status has changed */
2198 if (bond->params.mode == BOND_MODE_8023AD) {
2199 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2200 }
2201
2202 if ((bond->params.mode == BOND_MODE_TLB) ||
2203 (bond->params.mode == BOND_MODE_ALB)) {
2204 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2205 }
2206
2207 if ((!oldcurrent) ||
2208 (slave == bond->primary_slave)) {
2209 do_failover = 1;
2210 }
2211 } else {
2212 slave->delay--;
2213 }
2214 }
2215 break;
2216 default:
2217 /* Should not happen */
4e0952c7
MW		 2218 printk(KERN_ERR DRV_NAME
2219 ": %s: Error: %s Illegal value (link=%d)\n",
2220 bond_dev->name,
2221 slave->dev->name,
2222 slave->link);
1da177e4
LT		 2223 goto out;
2224 } /* end of switch (slave->link) */
2225
2226 bond_update_speed_duplex(slave);
2227
2228 if (bond->params.mode == BOND_MODE_8023AD) {
2229 if (old_speed != slave->speed) {
2230 bond_3ad_adapter_speed_changed(slave);
2231 }
2232
2233 if (old_duplex != slave->duplex) {
2234 bond_3ad_adapter_duplex_changed(slave);
2235 }
2236 }
2237
2238 } /* end of for */
2239
2240 if (do_failover) {
2241 write_lock(&bond->curr_slave_lock);
2242
2243 bond_select_active_slave(bond);
2244
1da177e4 2245 write_unlock(&bond->curr_slave_lock);
ff59c456
JV		 2246 } else
2247 bond_set_carrier(bond);
1da177e4
LT		 2248
2249re_arm:
2250 if (bond->params.miimon) {
2251 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2252 }
2253out:
2254 read_unlock(&bond->lock);
2255}
2256
c3ade5ca
JV		 2257
2258static u32 bond_glean_dev_ip(struct net_device *dev)
2259{
2260 struct in_device *idev;
2261 struct in_ifaddr *ifa;
2262 u32 addr = 0;
2263
2264 if (!dev)
2265 return 0;
2266
2267 rcu_read_lock();
e5ed6399 2268 idev = __in_dev_get_rcu(dev);
c3ade5ca
JV		 2269 if (!idev)
2270 goto out;
2271
2272 ifa = idev->ifa_list;
2273 if (!ifa)
2274 goto out;
2275
2276 addr = ifa->ifa_local;
2277out:
2278 rcu_read_unlock();
2279 return addr;
2280}
2281
2282static int bond_has_ip(struct bonding *bond)
2283{
2284 struct vlan_entry *vlan, *vlan_next;
2285
2286 if (bond->master_ip)
2287 return 1;
2288
2289 if (list_empty(&bond->vlan_list))
2290 return 0;
2291
2292 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2293 vlan_list) {
2294 if (vlan->vlan_ip)
2295 return 1;
2296 }
2297
2298 return 0;
2299}
2300
2301/*
2302 * We go to the (large) trouble of VLAN tagging ARP frames because
2303 * switches in VLAN mode (especially if ports are configured as
2304 * "native" to a VLAN) might not pass non-tagged frames.
2305 */
2306static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2307{
2308 struct sk_buff *skb;
2309
2310 dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2311 slave_dev->name, dest_ip, src_ip, vlan_id);
2312
2313 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2314 NULL, slave_dev->dev_addr, NULL);
2315
2316 if (!skb) {
2317 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2318 return;
2319 }
2320 if (vlan_id) {
2321 skb = vlan_put_tag(skb, vlan_id);
2322 if (!skb) {
2323 printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2324 return;
2325 }
2326 }
2327 arp_xmit(skb);
2328}
2329
2330
1da177e4
LT		 2331static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2332{
c3ade5ca 2333 int i, vlan_id, rv;
1da177e4 2334 u32 *targets = bond->params.arp_targets;
c3ade5ca
JV		 2335 struct vlan_entry *vlan, *vlan_next;
2336 struct net_device *vlan_dev;
2337 struct flowi fl;
2338 struct rtable *rt;
1da177e4 2339
6b780567
MW		 2340 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2341 if (!targets[i])
2342 continue;
c3ade5ca
JV		 2343 dprintk("basa: target %x\n", targets[i]);
2344 if (list_empty(&bond->vlan_list)) {
2345 dprintk("basa: empty vlan: arp_send\n");
2346 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2347 bond->master_ip, 0);
2348 continue;
2349 }
2350
2351 /*
2352 * If VLANs are configured, we do a route lookup to
2353 * determine which VLAN interface would be used, so we
2354 * can tag the ARP with the proper VLAN tag.
2355 */
2356 memset(&fl, 0, sizeof(fl));
2357 fl.fl4_dst = targets[i];
2358 fl.fl4_tos = RTO_ONLINK;
2359
2360 rv = ip_route_output_key(&rt, &fl);
2361 if (rv) {
2362 if (net_ratelimit()) {
2363 printk(KERN_WARNING DRV_NAME
2364 ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2365 bond->dev->name, NIPQUAD(fl.fl4_dst));
2366 }
2367 continue;
2368 }
2369
2370 /*
2371 * This target is not on a VLAN
2372 */
2373 if (rt->u.dst.dev == bond->dev) {
ed4b9f80 2374 ip_rt_put(rt);
c3ade5ca
JV		 2375 dprintk("basa: rtdev == bond->dev: arp_send\n");
2376 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2377 bond->master_ip, 0);
2378 continue;
2379 }
2380
2381 vlan_id = 0;
2382 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2383 vlan_list) {
2384 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2385 if (vlan_dev == rt->u.dst.dev) {
2386 vlan_id = vlan->vlan_id;
2387 dprintk("basa: vlan match on %s %d\n",
2388 vlan_dev->name, vlan_id);
2389 break;
2390 }
2391 }
2392
2393 if (vlan_id) {
ed4b9f80 2394 ip_rt_put(rt);
c3ade5ca
JV		 2395 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2396 vlan->vlan_ip, vlan_id);
2397 continue;
2398 }
2399
2400 if (net_ratelimit()) {
2401 printk(KERN_WARNING DRV_NAME
2402 ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2403 bond->dev->name, NIPQUAD(fl.fl4_dst),
2404 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2405 }
ed4b9f80 2406 ip_rt_put(rt);
c3ade5ca
JV		 2407 }
2408}
2409
2410/*
2411 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2412 * for each VLAN above us.
2413 */
2414static void bond_send_gratuitous_arp(struct bonding *bond)
2415{
2416 struct slave *slave = bond->curr_active_slave;
2417 struct vlan_entry *vlan;
2418 struct net_device *vlan_dev;
2419
2420 dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2421 slave ? slave->dev->name : "NULL");
2422 if (!slave)
2423 return;
2424
2425 if (bond->master_ip) {
2426 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2427 bond->master_ip, 0);
2428 }
2429
2430 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2431 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2432 if (vlan->vlan_ip) {
2433 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2434 vlan->vlan_ip, vlan->vlan_id);
2435 }
1da177e4
LT		 2436 }
2437}
2438
2439/*
2440 * this function is called regularly to monitor each slave's link
2441 * ensuring that traffic is being sent and received when arp monitoring
2442 * is used in load-balancing mode. if the adapter has been dormant, then an
2443 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2444 * arp monitoring in active backup mode.
2445 */
a77b5325 2446void bond_loadbalance_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2447{
2448 struct bonding *bond = bond_dev->priv;
2449 struct slave *slave, *oldcurrent;
2450 int do_failover = 0;
2451 int delta_in_ticks;
2452 int i;
2453
2454 read_lock(&bond->lock);
2455
2456 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2457
2458 if (bond->kill_timers) {
2459 goto out;
2460 }
2461
2462 if (bond->slave_cnt == 0) {
2463 goto re_arm;
2464 }
2465
2466 read_lock(&bond->curr_slave_lock);
2467 oldcurrent = bond->curr_active_slave;
2468 read_unlock(&bond->curr_slave_lock);
2469
2470 /* see if any of the previous devices are up now (i.e. they have
2471 * xmt and rcv traffic). the curr_active_slave does not come into
2472 * the picture unless it is null. also, slave->jiffies is not needed
2473 * here because we send an arp on each slave and give a slave as
2474 * long as it needs to get the tx/rx within the delta.
2475 * TODO: what about up/down delay in arp mode? it wasn't here before
2476 * so it can wait
2477 */
2478 bond_for_each_slave(bond, slave, i) {
2479 if (slave->link != BOND_LINK_UP) {
2480 if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2481 ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2482
2483 slave->link = BOND_LINK_UP;
2484 slave->state = BOND_STATE_ACTIVE;
2485
2486 /* primary_slave has no meaning in round-robin
2487 * mode. the window of a slave being up and
2488 * curr_active_slave being null after enslaving
2489 * is closed.
2490 */
2491 if (!oldcurrent) {
2492 printk(KERN_INFO DRV_NAME
2493 ": %s: link status definitely "
2494 "up for interface %s, ",
2495 bond_dev->name,
2496 slave->dev->name);
2497 do_failover = 1;
2498 } else {
2499 printk(KERN_INFO DRV_NAME
2500 ": %s: interface %s is now up\n",
2501 bond_dev->name,
2502 slave->dev->name);
2503 }
2504 }
2505 } else {
2506 /* slave->link == BOND_LINK_UP */
2507
2508 /* not all switches will respond to an arp request
2509 * when the source ip is 0, so don't take the link down
2510 * if we don't know our ip yet
2511 */
2512 if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2513 (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
c3ade5ca 2514 bond_has_ip(bond))) {
1da177e4
LT		 2515
2516 slave->link = BOND_LINK_DOWN;
2517 slave->state = BOND_STATE_BACKUP;
2518
2519 if (slave->link_failure_count < UINT_MAX) {
2520 slave->link_failure_count++;
2521 }
2522
2523 printk(KERN_INFO DRV_NAME
2524 ": %s: interface %s is now down.\n",
2525 bond_dev->name,
2526 slave->dev->name);
2527
2528 if (slave == oldcurrent) {
2529 do_failover = 1;
2530 }
2531 }
2532 }
2533
2534 /* note: if switch is in round-robin mode, all links
2535 * must tx arp to ensure all links rx an arp - otherwise
2536 * links may oscillate or not come up at all; if switch is
2537 * in something like xor mode, there is nothing we can
2538 * do - all replies will be rx'ed on same link causing slaves
2539 * to be unstable during low/no traffic periods
2540 */
2541 if (IS_UP(slave->dev)) {
2542 bond_arp_send_all(bond, slave);
2543 }
2544 }
2545
2546 if (do_failover) {
2547 write_lock(&bond->curr_slave_lock);
2548
2549 bond_select_active_slave(bond);
2550
1da177e4
LT		 2551 write_unlock(&bond->curr_slave_lock);
2552 }
2553
2554re_arm:
2555 if (bond->params.arp_interval) {
2556 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2557 }
2558out:
2559 read_unlock(&bond->lock);
2560}
2561
2562/*
2563 * When using arp monitoring in active-backup mode, this function is
2564 * called to determine if any backup slaves have went down or a new
2565 * current slave needs to be found.
2566 * The backup slaves never generate traffic, they are considered up by merely
2567 * receiving traffic. If the current slave goes down, each backup slave will
2568 * be given the opportunity to tx/rx an arp before being taken down - this
2569 * prevents all slaves from being taken down due to the current slave not
2570 * sending any traffic for the backups to receive. The arps are not necessarily
2571 * necessary, any tx and rx traffic will keep the current slave up. While any
2572 * rx traffic will keep the backup slaves up, the current slave is responsible
2573 * for generating traffic to keep them up regardless of any other traffic they
2574 * may have received.
2575 * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2576 */
a77b5325 2577void bond_activebackup_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2578{
2579 struct bonding *bond = bond_dev->priv;
2580 struct slave *slave;
2581 int delta_in_ticks;
2582 int i;
2583
2584 read_lock(&bond->lock);
2585
2586 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2587
2588 if (bond->kill_timers) {
2589 goto out;
2590 }
2591
2592 if (bond->slave_cnt == 0) {
2593 goto re_arm;
2594 }
2595
2596 /* determine if any slave has come up or any backup slave has
2597 * gone down
2598 * TODO: what about up/down delay in arp mode? it wasn't here before
2599 * so it can wait
2600 */
2601 bond_for_each_slave(bond, slave, i) {
2602 if (slave->link != BOND_LINK_UP) {
2603 if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) {
2604
2605 slave->link = BOND_LINK_UP;
2606
2607 write_lock(&bond->curr_slave_lock);
2608
2609 if ((!bond->curr_active_slave) &&
2610 ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2611 bond_change_active_slave(bond, slave);
2612 bond->current_arp_slave = NULL;
2613 } else if (bond->curr_active_slave != slave) {
2614 /* this slave has just come up but we
2615 * already have a current slave; this
2616 * can also happen if bond_enslave adds
2617 * a new slave that is up while we are
2618 * searching for a new slave
2619 */
2620 bond_set_slave_inactive_flags(slave);
2621 bond->current_arp_slave = NULL;
2622 }
2623
ff59c456
JV		 2624 bond_set_carrier(bond);
2625
1da177e4
LT		 2626 if (slave == bond->curr_active_slave) {
2627 printk(KERN_INFO DRV_NAME
2628 ": %s: %s is up and now the "
2629 "active interface\n",
2630 bond_dev->name,
2631 slave->dev->name);
ff59c456 2632 netif_carrier_on(bond->dev);
1da177e4
LT		 2633 } else {
2634 printk(KERN_INFO DRV_NAME
2635 ": %s: backup interface %s is "
2636 "now up\n",
2637 bond_dev->name,
2638 slave->dev->name);
2639 }
2640
2641 write_unlock(&bond->curr_slave_lock);
2642 }
2643 } else {
2644 read_lock(&bond->curr_slave_lock);
2645
2646 if ((slave != bond->curr_active_slave) &&
2647 (!bond->current_arp_slave) &&
2648 (((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) &&
c3ade5ca 2649 bond_has_ip(bond))) {
1da177e4
LT		 2650 /* a backup slave has gone down; three times
2651 * the delta allows the current slave to be
2652 * taken out before the backup slave.
2653 * note: a non-null current_arp_slave indicates
2654 * the curr_active_slave went down and we are
2655 * searching for a new one; under this
2656 * condition we only take the curr_active_slave
2657 * down - this gives each slave a chance to
2658 * tx/rx traffic before being taken out
2659 */
2660
2661 read_unlock(&bond->curr_slave_lock);
2662
2663 slave->link = BOND_LINK_DOWN;
2664
2665 if (slave->link_failure_count < UINT_MAX) {
2666 slave->link_failure_count++;
2667 }
2668
2669 bond_set_slave_inactive_flags(slave);
2670
2671 printk(KERN_INFO DRV_NAME
2672 ": %s: backup interface %s is now down\n",
2673 bond_dev->name,
2674 slave->dev->name);
2675 } else {
2676 read_unlock(&bond->curr_slave_lock);
2677 }
2678 }
2679 }
2680
2681 read_lock(&bond->curr_slave_lock);
2682 slave = bond->curr_active_slave;
2683 read_unlock(&bond->curr_slave_lock);
2684
2685 if (slave) {
2686 /* if we have sent traffic in the past 2*arp_intervals but
2687 * haven't xmit and rx traffic in that time interval, select
2688 * a different slave. slave->jiffies is only updated when
2689 * a slave first becomes the curr_active_slave - not necessarily
2690 * after every arp; this ensures the slave has a full 2*delta
2691 * before being taken out. if a primary is being used, check
2692 * if it is up and needs to take over as the curr_active_slave
2693 */
2694 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
c3ade5ca
JV		 2695 (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2696 bond_has_ip(bond))) &&
1da177e4
LT		 2697 ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2698
2699 slave->link = BOND_LINK_DOWN;
2700
2701 if (slave->link_failure_count < UINT_MAX) {
2702 slave->link_failure_count++;
2703 }
2704
2705 printk(KERN_INFO DRV_NAME
2706 ": %s: link status down for active interface "
2707 "%s, disabling it\n",
2708 bond_dev->name,
2709 slave->dev->name);
2710
2711 write_lock(&bond->curr_slave_lock);
2712
2713 bond_select_active_slave(bond);
2714 slave = bond->curr_active_slave;
2715
2716 write_unlock(&bond->curr_slave_lock);
2717
2718 bond->current_arp_slave = slave;
2719
2720 if (slave) {
2721 slave->jiffies = jiffies;
2722 }
2723 } else if ((bond->primary_slave) &&
2724 (bond->primary_slave != slave) &&
2725 (bond->primary_slave->link == BOND_LINK_UP)) {
2726 /* at this point, slave is the curr_active_slave */
2727 printk(KERN_INFO DRV_NAME
2728 ": %s: changing from interface %s to primary "
2729 "interface %s\n",
2730 bond_dev->name,
2731 slave->dev->name,
2732 bond->primary_slave->dev->name);
2733
2734 /* primary is up so switch to it */
2735 write_lock(&bond->curr_slave_lock);
2736 bond_change_active_slave(bond, bond->primary_slave);
2737 write_unlock(&bond->curr_slave_lock);
2738
2739 slave = bond->primary_slave;
2740 slave->jiffies = jiffies;
2741 } else {
2742 bond->current_arp_slave = NULL;
2743 }
2744
2745 /* the current slave must tx an arp to ensure backup slaves
2746 * rx traffic
2747 */
c3ade5ca 2748 if (slave && bond_has_ip(bond)) {
1da177e4
LT		 2749 bond_arp_send_all(bond, slave);
2750 }
2751 }
2752
2753 /* if we don't have a curr_active_slave, search for the next available
2754 * backup slave from the current_arp_slave and make it the candidate
2755 * for becoming the curr_active_slave
2756 */
2757 if (!slave) {
2758 if (!bond->current_arp_slave) {
2759 bond->current_arp_slave = bond->first_slave;
2760 }
2761
2762 if (bond->current_arp_slave) {
2763 bond_set_slave_inactive_flags(bond->current_arp_slave);
2764
2765 /* search for next candidate */
2f872f04 2766 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
1da177e4
LT		 2767 if (IS_UP(slave->dev)) {
2768 slave->link = BOND_LINK_BACK;
2769 bond_set_slave_active_flags(slave);
2770 bond_arp_send_all(bond, slave);
2771 slave->jiffies = jiffies;
2772 bond->current_arp_slave = slave;
2773 break;
2774 }
2775
2776 /* if the link state is up at this point, we
2777 * mark it down - this can happen if we have
2778 * simultaneous link failures and
2779 * reselect_active_interface doesn't make this
2780 * one the current slave so it is still marked
2781 * up when it is actually down
2782 */
2783 if (slave->link == BOND_LINK_UP) {
2784 slave->link = BOND_LINK_DOWN;
2785 if (slave->link_failure_count < UINT_MAX) {
2786 slave->link_failure_count++;
2787 }
2788
2789 bond_set_slave_inactive_flags(slave);
2790
2791 printk(KERN_INFO DRV_NAME
2792 ": %s: backup interface %s is "
2793 "now down.\n",
2794 bond_dev->name,
2795 slave->dev->name);
2796 }
2797 }
2798 }
2799 }
2800
2801re_arm:
2802 if (bond->params.arp_interval) {
2803 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2804 }
2805out:
2806 read_unlock(&bond->lock);
2807}
2808
2809/*------------------------------ proc/seq_file-------------------------------*/
2810
2811#ifdef CONFIG_PROC_FS
2812
2813#define SEQ_START_TOKEN ((void *)1)
2814
2815static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2816{
2817 struct bonding *bond = seq->private;
2818 loff_t off = 0;
2819 struct slave *slave;
2820 int i;
2821
2822 /* make sure the bond won't be taken away */
2823 read_lock(&dev_base_lock);
2824 read_lock_bh(&bond->lock);
2825
2826 if (*pos == 0) {
2827 return SEQ_START_TOKEN;
2828 }
2829
2830 bond_for_each_slave(bond, slave, i) {
2831 if (++off == *pos) {
2832 return slave;
2833 }
2834 }
2835
2836 return NULL;
2837}
2838
2839static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2840{
2841 struct bonding *bond = seq->private;
2842 struct slave *slave = v;
2843
2844 ++*pos;
2845 if (v == SEQ_START_TOKEN) {
2846 return bond->first_slave;
2847 }
2848
2849 slave = slave->next;
2850
2851 return (slave == bond->first_slave) ? NULL : slave;
2852}
2853
2854static void bond_info_seq_stop(struct seq_file *seq, void *v)
2855{
2856 struct bonding *bond = seq->private;
2857
2858 read_unlock_bh(&bond->lock);
2859 read_unlock(&dev_base_lock);
2860}
2861
2862static void bond_info_show_master(struct seq_file *seq)
2863{
2864 struct bonding *bond = seq->private;
2865 struct slave *curr;
4756b02f
MW		 2866 int i;
2867 u32 target;
1da177e4
LT		 2868
2869 read_lock(&bond->curr_slave_lock);
2870 curr = bond->curr_active_slave;
2871 read_unlock(&bond->curr_slave_lock);
2872
2873 seq_printf(seq, "Bonding Mode: %s\n",
2874 bond_mode_name(bond->params.mode));
2875
c61b75ad
MW		 2876 if (bond->params.mode == BOND_MODE_XOR ||
2877 bond->params.mode == BOND_MODE_8023AD) {
2878 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2879 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2880 bond->params.xmit_policy);
2881 }
2882
1da177e4
LT		 2883 if (USES_PRIMARY(bond->params.mode)) {
2884 seq_printf(seq, "Primary Slave: %s\n",
0f418b2a
MW		 2885 (bond->primary_slave) ?
2886 bond->primary_slave->dev->name : "None");
1da177e4
LT		 2887
2888 seq_printf(seq, "Currently Active Slave: %s\n",
2889 (curr) ? curr->dev->name : "None");
2890 }
2891
ff59c456
JV		 2892 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2893 "up" : "down");
1da177e4
LT		 2894 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2895 seq_printf(seq, "Up Delay (ms): %d\n",
2896 bond->params.updelay * bond->params.miimon);
2897 seq_printf(seq, "Down Delay (ms): %d\n",
2898 bond->params.downdelay * bond->params.miimon);
2899
4756b02f
MW		 2900
2901 /* ARP information */
2902 if(bond->params.arp_interval > 0) {
2903 int printed=0;
2904 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2905 bond->params.arp_interval);
2906
2907 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2908
2909 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2910 if (!bond->params.arp_targets[i])
2911 continue;
2912 if (printed)
2913 seq_printf(seq, ",");
2914 target = ntohl(bond->params.arp_targets[i]);
2915 seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
2916 printed = 1;
2917 }
2918 seq_printf(seq, "\n");
2919 }
2920
1da177e4
LT		 2921 if (bond->params.mode == BOND_MODE_8023AD) {
2922 struct ad_info ad_info;
2923
2924 seq_puts(seq, "\n802.3ad info\n");
2925 seq_printf(seq, "LACP rate: %s\n",
2926 (bond->params.lacp_fast) ? "fast" : "slow");
2927
2928 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2929 seq_printf(seq, "bond %s has no active aggregator\n",
2930 bond->dev->name);
2931 } else {
2932 seq_printf(seq, "Active Aggregator Info:\n");
2933
2934 seq_printf(seq, "\tAggregator ID: %d\n",
2935 ad_info.aggregator_id);
2936 seq_printf(seq, "\tNumber of ports: %d\n",
2937 ad_info.ports);
2938 seq_printf(seq, "\tActor Key: %d\n",
2939 ad_info.actor_key);
2940 seq_printf(seq, "\tPartner Key: %d\n",
2941 ad_info.partner_key);
2942 seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
2943 ad_info.partner_system[0],
2944 ad_info.partner_system[1],
2945 ad_info.partner_system[2],
2946 ad_info.partner_system[3],
2947 ad_info.partner_system[4],
2948 ad_info.partner_system[5]);
2949 }
2950 }
2951}
2952
2953static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
2954{
2955 struct bonding *bond = seq->private;
2956
2957 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
2958 seq_printf(seq, "MII Status: %s\n",
2959 (slave->link == BOND_LINK_UP) ? "up" : "down");
65509645 2960 seq_printf(seq, "Link Failure Count: %u\n",
1da177e4
LT		 2961 slave->link_failure_count);
2962
217df670
JV		 2963 seq_printf(seq,
2964 "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
2965 slave->perm_hwaddr[0], slave->perm_hwaddr[1],
2966 slave->perm_hwaddr[2], slave->perm_hwaddr[3],
2967 slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
1da177e4
LT		 2968
2969 if (bond->params.mode == BOND_MODE_8023AD) {
2970 const struct aggregator *agg
2971 = SLAVE_AD_INFO(slave).port.aggregator;
2972
2973 if (agg) {
2974 seq_printf(seq, "Aggregator ID: %d\n",
2975 agg->aggregator_identifier);
2976 } else {
2977 seq_puts(seq, "Aggregator ID: N/A\n");
2978 }
2979 }
2980}
2981
2982static int bond_info_seq_show(struct seq_file *seq, void *v)
2983{
2984 if (v == SEQ_START_TOKEN) {
2985 seq_printf(seq, "%s\n", version);
2986 bond_info_show_master(seq);
2987 } else {
2988 bond_info_show_slave(seq, v);
2989 }
2990
2991 return 0;
2992}
2993
2994static struct seq_operations bond_info_seq_ops = {
2995 .start = bond_info_seq_start,
2996 .next = bond_info_seq_next,
2997 .stop = bond_info_seq_stop,
2998 .show = bond_info_seq_show,
2999};
3000
3001static int bond_info_open(struct inode *inode, struct file *file)
3002{
3003 struct seq_file *seq;
3004 struct proc_dir_entry *proc;
3005 int res;
3006
3007 res = seq_open(file, &bond_info_seq_ops);
3008 if (!res) {
3009 /* recover the pointer buried in proc_dir_entry data */
3010 seq = file->private_data;
3011 proc = PDE(inode);
3012 seq->private = proc->data;
3013 }
3014
3015 return res;
3016}
3017
3018static struct file_operations bond_info_fops = {
3019 .owner = THIS_MODULE,
3020 .open = bond_info_open,
3021 .read = seq_read,
3022 .llseek = seq_lseek,
3023 .release = seq_release,
3024};
3025
3026static int bond_create_proc_entry(struct bonding *bond)
3027{
3028 struct net_device *bond_dev = bond->dev;
3029
3030 if (bond_proc_dir) {
3031 bond->proc_entry = create_proc_entry(bond_dev->name,
3032 S_IRUGO,
3033 bond_proc_dir);
3034 if (bond->proc_entry == NULL) {
3035 printk(KERN_WARNING DRV_NAME
3036 ": Warning: Cannot create /proc/net/%s/%s\n",
3037 DRV_NAME, bond_dev->name);
3038 } else {
3039 bond->proc_entry->data = bond;
3040 bond->proc_entry->proc_fops = &bond_info_fops;
3041 bond->proc_entry->owner = THIS_MODULE;
3042 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3043 }
3044 }
3045
3046 return 0;
3047}
3048
3049static void bond_remove_proc_entry(struct bonding *bond)
3050{
3051 if (bond_proc_dir && bond->proc_entry) {
3052 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3053 memset(bond->proc_file_name, 0, IFNAMSIZ);
3054 bond->proc_entry = NULL;
3055 }
3056}
3057
3058/* Create the bonding directory under /proc/net, if doesn't exist yet.
3059 * Caller must hold rtnl_lock.
3060 */
3061static void bond_create_proc_dir(void)
3062{
3063 int len = strlen(DRV_NAME);
3064
3065 for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
3066 bond_proc_dir = bond_proc_dir->next) {
3067 if ((bond_proc_dir->namelen == len) &&
3068 !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3069 break;
3070 }
3071 }
3072
3073 if (!bond_proc_dir) {
3074 bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
3075 if (bond_proc_dir) {
3076 bond_proc_dir->owner = THIS_MODULE;
3077 } else {
3078 printk(KERN_WARNING DRV_NAME
3079 ": Warning: cannot create /proc/net/%s\n",
3080 DRV_NAME);
3081 }
3082 }
3083}
3084
3085/* Destroy the bonding directory under /proc/net, if empty.
3086 * Caller must hold rtnl_lock.
3087 */
3088static void bond_destroy_proc_dir(void)
3089{
3090 struct proc_dir_entry *de;
3091
3092 if (!bond_proc_dir) {
3093 return;
3094 }
3095
3096 /* verify that the /proc dir is empty */
3097 for (de = bond_proc_dir->subdir; de; de = de->next) {
3098 /* ignore . and .. */
3099 if (*(de->name) != '.') {
3100 break;
3101 }
3102 }
3103
3104 if (de) {
3105 if (bond_proc_dir->owner == THIS_MODULE) {
3106 bond_proc_dir->owner = NULL;
3107 }
3108 } else {
3109 remove_proc_entry(DRV_NAME, proc_net);
3110 bond_proc_dir = NULL;
3111 }
3112}
3113#endif /* CONFIG_PROC_FS */
3114
3115/*-------------------------- netdev event handling --------------------------*/
3116
3117/*
3118 * Change device name
3119 */
3120static int bond_event_changename(struct bonding *bond)
3121{
3122#ifdef CONFIG_PROC_FS
3123 bond_remove_proc_entry(bond);
3124 bond_create_proc_entry(bond);
3125#endif
b76cdba9
MW		 3126 down_write(&(bonding_rwsem));
3127 bond_destroy_sysfs_entry(bond);
3128 bond_create_sysfs_entry(bond);
3129 up_write(&(bonding_rwsem));
1da177e4
LT		 3130 return NOTIFY_DONE;
3131}
3132
3133static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3134{
3135 struct bonding *event_bond = bond_dev->priv;
3136
3137 switch (event) {
3138 case NETDEV_CHANGENAME:
3139 return bond_event_changename(event_bond);
3140 case NETDEV_UNREGISTER:
3141 /*
3142 * TODO: remove a bond from the list?
3143 */
3144 break;
3145 default:
3146 break;
3147 }
3148
3149 return NOTIFY_DONE;
3150}
3151
3152static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3153{
3154 struct net_device *bond_dev = slave_dev->master;
8531c5ff 3155 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3156
3157 switch (event) {
3158 case NETDEV_UNREGISTER:
3159 if (bond_dev) {
3160 bond_release(bond_dev, slave_dev);
3161 }
3162 break;
3163 case NETDEV_CHANGE:
3164 /*
3165 * TODO: is this what we get if somebody
3166 * sets up a hierarchical bond, then rmmod's
3167 * one of the slave bonding devices?
3168 */
3169 break;
3170 case NETDEV_DOWN:
3171 /*
3172 * ... Or is it this?
3173 */
3174 break;
3175 case NETDEV_CHANGEMTU:
3176 /*
3177 * TODO: Should slaves be allowed to
3178 * independently alter their MTU? For
3179 * an active-backup bond, slaves need
3180 * not be the same type of device, so
3181 * MTUs may vary. For other modes,
3182 * slaves arguably should have the
3183 * same MTUs. To do this, we'd need to
3184 * take over the slave's change_mtu
3185 * function for the duration of their
3186 * servitude.
3187 */
3188 break;
3189 case NETDEV_CHANGENAME:
3190 /*
3191 * TODO: handle changing the primary's name
3192 */
3193 break;
8531c5ff
AK		 3194 case NETDEV_FEAT_CHANGE:
3195 bond_compute_features(bond);
3196 break;
1da177e4
LT		 3197 default:
3198 break;
3199 }
3200
3201 return NOTIFY_DONE;
3202}
3203
3204/*
3205 * bond_netdev_event: handle netdev notifier chain events.
3206 *
3207 * This function receives events for the netdev chain. The caller (an
e041c683 3208 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
1da177e4
LT		 3209 * locks for us to safely manipulate the slave devices (RTNL lock,
3210 * dev_probe_lock).
3211 */
3212static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3213{
3214 struct net_device *event_dev = (struct net_device *)ptr;
3215
3216 dprintk("event_dev: %s, event: %lx\n",
3217 (event_dev ? event_dev->name : "None"),
3218 event);
3219
0b680e75
JV		 3220 if (!(event_dev->priv_flags & IFF_BONDING))
3221 return NOTIFY_DONE;
3222
1da177e4
LT		 3223 if (event_dev->flags & IFF_MASTER) {
3224 dprintk("IFF_MASTER\n");
3225 return bond_master_netdev_event(event, event_dev);
3226 }
3227
3228 if (event_dev->flags & IFF_SLAVE) {
3229 dprintk("IFF_SLAVE\n");
3230 return bond_slave_netdev_event(event, event_dev);
3231 }
3232
3233 return NOTIFY_DONE;
3234}
3235
c3ade5ca
JV		 3236/*
3237 * bond_inetaddr_event: handle inetaddr notifier chain events.
3238 *
3239 * We keep track of device IPs primarily to use as source addresses in
3240 * ARP monitor probes (rather than spewing out broadcasts all the time).
3241 *
3242 * We track one IP for the main device (if it has one), plus one per VLAN.
3243 */
3244static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3245{
3246 struct in_ifaddr *ifa = ptr;
3247 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3248 struct bonding *bond, *bond_next;
3249 struct vlan_entry *vlan, *vlan_next;
3250
3251 list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3252 if (bond->dev == event_dev) {
3253 switch (event) {
3254 case NETDEV_UP:
3255 bond->master_ip = ifa->ifa_local;
3256 return NOTIFY_OK;
3257 case NETDEV_DOWN:
3258 bond->master_ip = bond_glean_dev_ip(bond->dev);
3259 return NOTIFY_OK;
3260 default:
3261 return NOTIFY_DONE;
3262 }
3263 }
3264
3265 if (list_empty(&bond->vlan_list))
3266 continue;
3267
3268 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3269 vlan_list) {
3270 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
3271 if (vlan_dev == event_dev) {
3272 switch (event) {
3273 case NETDEV_UP:
3274 vlan->vlan_ip = ifa->ifa_local;
3275 return NOTIFY_OK;
3276 case NETDEV_DOWN:
3277 vlan->vlan_ip =
3278 bond_glean_dev_ip(vlan_dev);
3279 return NOTIFY_OK;
3280 default:
3281 return NOTIFY_DONE;
3282 }
3283 }
3284 }
3285 }
3286 return NOTIFY_DONE;
3287}
3288
1da177e4
LT		 3289static struct notifier_block bond_netdev_notifier = {
3290 .notifier_call = bond_netdev_event,
3291};
3292
c3ade5ca
JV		 3293static struct notifier_block bond_inetaddr_notifier = {
3294 .notifier_call = bond_inetaddr_event,
3295};
3296
1da177e4
LT		 3297/*-------------------------- Packet type handling ---------------------------*/
3298
3299/* register to receive lacpdus on a bond */
3300static void bond_register_lacpdu(struct bonding *bond)
3301{
3302 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3303
3304 /* initialize packet type */
3305 pk_type->type = PKT_TYPE_LACPDU;
3306 pk_type->dev = bond->dev;
3307 pk_type->func = bond_3ad_lacpdu_recv;
3308
3309 dev_add_pack(pk_type);
3310}
3311
3312/* unregister to receive lacpdus on a bond */
3313static void bond_unregister_lacpdu(struct bonding *bond)
3314{
3315 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3316}
3317
169a3e66
JV		 3318/*---------------------------- Hashing Policies -----------------------------*/
3319
3320/*
3321 * Hash for the the output device based upon layer 3 and layer 4 data. If
3322 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3323 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3324 */
3325static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3326 struct net_device *bond_dev, int count)
3327{
3328 struct ethhdr *data = (struct ethhdr *)skb->data;
3329 struct iphdr *iph = skb->nh.iph;
3330 u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3331 int layer4_xor = 0;
3332
3333 if (skb->protocol == __constant_htons(ETH_P_IP)) {
3334 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3335 (iph->protocol == IPPROTO_TCP ||
3336 iph->protocol == IPPROTO_UDP)) {
3337 layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3338 }
3339 return (layer4_xor ^
3340 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3341
3342 }
3343
3344 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3345}
3346
3347/*
3348 * Hash for the output device based upon layer 2 data
3349 */
3350static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3351 struct net_device *bond_dev, int count)
3352{
3353 struct ethhdr *data = (struct ethhdr *)skb->data;
3354
3355 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3356}
3357
1da177e4
LT		 3358/*-------------------------- Device entry points ----------------------------*/
3359
3360static int bond_open(struct net_device *bond_dev)
3361{
3362 struct bonding *bond = bond_dev->priv;
3363 struct timer_list *mii_timer = &bond->mii_timer;
3364 struct timer_list *arp_timer = &bond->arp_timer;
3365
3366 bond->kill_timers = 0;
3367
3368 if ((bond->params.mode == BOND_MODE_TLB) ||
3369 (bond->params.mode == BOND_MODE_ALB)) {
3370 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3371
3372 /* bond_alb_initialize must be called before the timer
3373 * is started.
3374 */
3375 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3376 /* something went wrong - fail the open operation */
3377 return -1;
3378 }
3379
3380 init_timer(alb_timer);
3381 alb_timer->expires = jiffies + 1;
3382 alb_timer->data = (unsigned long)bond;
3383 alb_timer->function = (void *)&bond_alb_monitor;
3384 add_timer(alb_timer);
3385 }
3386
3387 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3388 init_timer(mii_timer);
3389 mii_timer->expires = jiffies + 1;
3390 mii_timer->data = (unsigned long)bond_dev;
3391 mii_timer->function = (void *)&bond_mii_monitor;
3392 add_timer(mii_timer);
3393 }
3394
3395 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3396 init_timer(arp_timer);
3397 arp_timer->expires = jiffies + 1;
3398 arp_timer->data = (unsigned long)bond_dev;
3399 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3400 arp_timer->function = (void *)&bond_activebackup_arp_mon;
3401 } else {
3402 arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3403 }
3404 add_timer(arp_timer);
3405 }
3406
3407 if (bond->params.mode == BOND_MODE_8023AD) {
3408 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3409 init_timer(ad_timer);
3410 ad_timer->expires = jiffies + 1;
3411 ad_timer->data = (unsigned long)bond;
3412 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3413 add_timer(ad_timer);
3414
3415 /* register to receive LACPDUs */
3416 bond_register_lacpdu(bond);
3417 }
3418
3419 return 0;
3420}
3421
3422static int bond_close(struct net_device *bond_dev)
3423{
3424 struct bonding *bond = bond_dev->priv;
3425
3426 if (bond->params.mode == BOND_MODE_8023AD) {
3427 /* Unregister the receive of LACPDUs */
3428 bond_unregister_lacpdu(bond);
3429 }
3430
3431 write_lock_bh(&bond->lock);
3432
1da177e4
LT		 3433
3434 /* signal timers not to re-arm */
3435 bond->kill_timers = 1;
3436
3437 write_unlock_bh(&bond->lock);
3438
3439 /* del_timer_sync must run without holding the bond->lock
3440 * because a running timer might be trying to hold it too
3441 */
3442
3443 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3444 del_timer_sync(&bond->mii_timer);
3445 }
3446
3447 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3448 del_timer_sync(&bond->arp_timer);
3449 }
3450
3451 switch (bond->params.mode) {
3452 case BOND_MODE_8023AD:
3453 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3454 break;
3455 case BOND_MODE_TLB:
3456 case BOND_MODE_ALB:
3457 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3458 break;
3459 default:
3460 break;
3461 }
3462
1da177e4
LT		 3463
3464 if ((bond->params.mode == BOND_MODE_TLB) ||
3465 (bond->params.mode == BOND_MODE_ALB)) {
3466 /* Must be called only after all
3467 * slaves have been released
3468 */
3469 bond_alb_deinitialize(bond);
3470 }
3471
3472 return 0;
3473}
3474
3475static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3476{
3477 struct bonding *bond = bond_dev->priv;
3478 struct net_device_stats *stats = &(bond->stats), *sstats;
3479 struct slave *slave;
3480 int i;
3481
3482 memset(stats, 0, sizeof(struct net_device_stats));
3483
3484 read_lock_bh(&bond->lock);
3485
3486 bond_for_each_slave(bond, slave, i) {
3487 sstats = slave->dev->get_stats(slave->dev);
3488
3489 stats->rx_packets += sstats->rx_packets;
3490 stats->rx_bytes += sstats->rx_bytes;
3491 stats->rx_errors += sstats->rx_errors;
3492 stats->rx_dropped += sstats->rx_dropped;
3493
3494 stats->tx_packets += sstats->tx_packets;
3495 stats->tx_bytes += sstats->tx_bytes;
3496 stats->tx_errors += sstats->tx_errors;
3497 stats->tx_dropped += sstats->tx_dropped;
3498
3499 stats->multicast += sstats->multicast;
3500 stats->collisions += sstats->collisions;
3501
3502 stats->rx_length_errors += sstats->rx_length_errors;
3503 stats->rx_over_errors += sstats->rx_over_errors;
3504 stats->rx_crc_errors += sstats->rx_crc_errors;
3505 stats->rx_frame_errors += sstats->rx_frame_errors;
3506 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3507 stats->rx_missed_errors += sstats->rx_missed_errors;
3508
3509 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3510 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3511 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3512 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3513 stats->tx_window_errors += sstats->tx_window_errors;
3514 }
3515
3516 read_unlock_bh(&bond->lock);
3517
3518 return stats;
3519}
3520
3521static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3522{
3523 struct net_device *slave_dev = NULL;
3524 struct ifbond k_binfo;
3525 struct ifbond __user *u_binfo = NULL;
3526 struct ifslave k_sinfo;
3527 struct ifslave __user *u_sinfo = NULL;
3528 struct mii_ioctl_data *mii = NULL;
1da177e4
LT		 3529 int res = 0;
3530
3531 dprintk("bond_ioctl: master=%s, cmd=%d\n",
3532 bond_dev->name, cmd);
3533
3534 switch (cmd) {
1da177e4
LT		 3535 case SIOCGMIIPHY:
3536 mii = if_mii(ifr);
3537 if (!mii) {
3538 return -EINVAL;
3539 }
3540 mii->phy_id = 0;
3541 /* Fall Through */
3542 case SIOCGMIIREG:
3543 /*
3544 * We do this again just in case we were called by SIOCGMIIREG
3545 * instead of SIOCGMIIPHY.
3546 */
3547 mii = if_mii(ifr);
3548 if (!mii) {
3549 return -EINVAL;
3550 }
3551
3552 if (mii->reg_num == 1) {
3553 struct bonding *bond = bond_dev->priv;
3554 mii->val_out = 0;
3555 read_lock_bh(&bond->lock);
3556 read_lock(&bond->curr_slave_lock);
3557 if (bond->curr_active_slave) {
3558 mii->val_out = BMSR_LSTATUS;
3559 }
3560 read_unlock(&bond->curr_slave_lock);
3561 read_unlock_bh(&bond->lock);
3562 }
3563
3564 return 0;
3565 case BOND_INFO_QUERY_OLD:
3566 case SIOCBONDINFOQUERY:
3567 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3568
3569 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3570 return -EFAULT;
3571 }
3572
3573 res = bond_info_query(bond_dev, &k_binfo);
3574 if (res == 0) {
3575 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3576 return -EFAULT;
3577 }
3578 }
3579
3580 return res;
3581 case BOND_SLAVE_INFO_QUERY_OLD:
3582 case SIOCBONDSLAVEINFOQUERY:
3583 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3584
3585 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3586 return -EFAULT;
3587 }
3588
3589 res = bond_slave_info_query(bond_dev, &k_sinfo);
3590 if (res == 0) {
3591 if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3592 return -EFAULT;
3593 }
3594 }
3595
3596 return res;
3597 default:
3598 /* Go on */
3599 break;
3600 }
3601
3602 if (!capable(CAP_NET_ADMIN)) {
3603 return -EPERM;
3604 }
3605
b76cdba9 3606 down_write(&(bonding_rwsem));
1da177e4
LT		 3607 slave_dev = dev_get_by_name(ifr->ifr_slave);
3608
3609 dprintk("slave_dev=%p: \n", slave_dev);
3610
3611 if (!slave_dev) {
3612 res = -ENODEV;
3613 } else {
3614 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3615 switch (cmd) {
3616 case BOND_ENSLAVE_OLD:
3617 case SIOCBONDENSLAVE:
3618 res = bond_enslave(bond_dev, slave_dev);
3619 break;
3620 case BOND_RELEASE_OLD:
3621 case SIOCBONDRELEASE:
3622 res = bond_release(bond_dev, slave_dev);
3623 break;
3624 case BOND_SETHWADDR_OLD:
3625 case SIOCBONDSETHWADDR:
3626 res = bond_sethwaddr(bond_dev, slave_dev);
3627 break;
3628 case BOND_CHANGE_ACTIVE_OLD:
3629 case SIOCBONDCHANGEACTIVE:
3630 res = bond_ioctl_change_active(bond_dev, slave_dev);
3631 break;
3632 default:
3633 res = -EOPNOTSUPP;
3634 }
3635
3636 dev_put(slave_dev);
3637 }
3638
b76cdba9 3639 up_write(&(bonding_rwsem));
1da177e4
LT		 3640 return res;
3641}
3642
3643static void bond_set_multicast_list(struct net_device *bond_dev)
3644{
3645 struct bonding *bond = bond_dev->priv;
3646 struct dev_mc_list *dmi;
3647
3648 write_lock_bh(&bond->lock);
3649
3650 /*
3651 * Do promisc before checking multicast_mode
3652 */
3653 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3654 bond_set_promiscuity(bond, 1);
3655 }
3656
3657 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3658 bond_set_promiscuity(bond, -1);
3659 }
3660
3661 /* set allmulti flag to slaves */
3662 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3663 bond_set_allmulti(bond, 1);
3664 }
3665
3666 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3667 bond_set_allmulti(bond, -1);
3668 }
3669
3670 bond->flags = bond_dev->flags;
3671
3672 /* looking for addresses to add to slaves' mc list */
3673 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3674 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3675 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3676 }
3677 }
3678
3679 /* looking for addresses to delete from slaves' list */
3680 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3681 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3682 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3683 }
3684 }
3685
3686 /* save master's multicast list */
3687 bond_mc_list_destroy(bond);
3688 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3689
3690 write_unlock_bh(&bond->lock);
3691}
3692
3693/*
3694 * Change the MTU of all of a master's slaves to match the master
3695 */
3696static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3697{
3698 struct bonding *bond = bond_dev->priv;
3699 struct slave *slave, *stop_at;
3700 int res = 0;
3701 int i;
3702
3703 dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3704 (bond_dev ? bond_dev->name : "None"), new_mtu);
3705
3706 /* Can't hold bond->lock with bh disabled here since
3707 * some base drivers panic. On the other hand we can't
3708 * hold bond->lock without bh disabled because we'll
3709 * deadlock. The only solution is to rely on the fact
3710 * that we're under rtnl_lock here, and the slaves
3711 * list won't change. This doesn't solve the problem
3712 * of setting the slave's MTU while it is
3713 * transmitting, but the assumption is that the base
3714 * driver can handle that.
3715 *
3716 * TODO: figure out a way to safely iterate the slaves
3717 * list, but without holding a lock around the actual
3718 * call to the base driver.
3719 */
3720
3721 bond_for_each_slave(bond, slave, i) {
3722 dprintk("s %p s->p %p c_m %p\n", slave,
3723 slave->prev, slave->dev->change_mtu);
e944ef79 3724
1da177e4
LT		 3725 res = dev_set_mtu(slave->dev, new_mtu);
3726
3727 if (res) {
3728 /* If we failed to set the slave's mtu to the new value
3729 * we must abort the operation even in ACTIVE_BACKUP
3730 * mode, because if we allow the backup slaves to have
3731 * different mtu values than the active slave we'll
3732 * need to change their mtu when doing a failover. That
3733 * means changing their mtu from timer context, which
3734 * is probably not a good idea.
3735 */
3736 dprintk("err %d %s\n", res, slave->dev->name);
3737 goto unwind;
3738 }
3739 }
3740
3741 bond_dev->mtu = new_mtu;
3742
3743 return 0;
3744
3745unwind:
3746 /* unwind from head to the slave that failed */
3747 stop_at = slave;
3748 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3749 int tmp_res;
3750
3751 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3752 if (tmp_res) {
3753 dprintk("unwind err %d dev %s\n", tmp_res,
3754 slave->dev->name);
3755 }
3756 }
3757
3758 return res;
3759}
3760
3761/*
3762 * Change HW address
3763 *
3764 * Note that many devices must be down to change the HW address, and
3765 * downing the master releases all slaves. We can make bonds full of
3766 * bonding devices to test this, however.
3767 */
3768static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3769{
3770 struct bonding *bond = bond_dev->priv;
3771 struct sockaddr *sa = addr, tmp_sa;
3772 struct slave *slave, *stop_at;
3773 int res = 0;
3774 int i;
3775
3776 dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3777
3778 if (!is_valid_ether_addr(sa->sa_data)) {
3779 return -EADDRNOTAVAIL;
3780 }
3781
3782 /* Can't hold bond->lock with bh disabled here since
3783 * some base drivers panic. On the other hand we can't
3784 * hold bond->lock without bh disabled because we'll
3785 * deadlock. The only solution is to rely on the fact
3786 * that we're under rtnl_lock here, and the slaves
3787 * list won't change. This doesn't solve the problem
3788 * of setting the slave's hw address while it is
3789 * transmitting, but the assumption is that the base
3790 * driver can handle that.
3791 *
3792 * TODO: figure out a way to safely iterate the slaves
3793 * list, but without holding a lock around the actual
3794 * call to the base driver.
3795 */
3796
3797 bond_for_each_slave(bond, slave, i) {
3798 dprintk("slave %p %s\n", slave, slave->dev->name);
3799
3800 if (slave->dev->set_mac_address == NULL) {
3801 res = -EOPNOTSUPP;
3802 dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3803 goto unwind;
3804 }
3805
3806 res = dev_set_mac_address(slave->dev, addr);
3807 if (res) {
3808 /* TODO: consider downing the slave
3809 * and retry ?
3810 * User should expect communications
3811 * breakage anyway until ARP finish
3812 * updating, so...
3813 */
3814 dprintk("err %d %s\n", res, slave->dev->name);
3815 goto unwind;
3816 }
3817 }
3818
3819 /* success */
3820 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3821 return 0;
3822
3823unwind:
3824 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3825 tmp_sa.sa_family = bond_dev->type;
3826
3827 /* unwind from head to the slave that failed */
3828 stop_at = slave;
3829 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3830 int tmp_res;
3831
3832 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3833 if (tmp_res) {
3834 dprintk("unwind err %d dev %s\n", tmp_res,
3835 slave->dev->name);
3836 }
3837 }
3838
3839 return res;
3840}
3841
3842static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3843{
3844 struct bonding *bond = bond_dev->priv;
3845 struct slave *slave, *start_at;
3846 int i;
3847 int res = 1;
3848
3849 read_lock(&bond->lock);
3850
3851 if (!BOND_IS_OK(bond)) {
3852 goto out;
3853 }
3854
3855 read_lock(&bond->curr_slave_lock);
3856 slave = start_at = bond->curr_active_slave;
3857 read_unlock(&bond->curr_slave_lock);
3858
3859 if (!slave) {
3860 goto out;
3861 }
3862
3863 bond_for_each_slave_from(bond, slave, i, start_at) {
3864 if (IS_UP(slave->dev) &&
3865 (slave->link == BOND_LINK_UP) &&
3866 (slave->state == BOND_STATE_ACTIVE)) {
3867 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3868
3869 write_lock(&bond->curr_slave_lock);
3870 bond->curr_active_slave = slave->next;
3871 write_unlock(&bond->curr_slave_lock);
3872
3873 break;
3874 }
3875 }
3876
3877
3878out:
3879 if (res) {
3880 /* no suitable interface, frame not sent */
3881 dev_kfree_skb(skb);
3882 }
3883 read_unlock(&bond->lock);
3884 return 0;
3885}
3886
075897ce 3887static void bond_activebackup_xmit_copy(struct sk_buff *skb,
df49898a
JL		 3888 struct bonding *bond,
3889 struct slave *slave)
075897ce
JL		 3890{
3891 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
3892 struct ethhdr *eth_data;
3893 u8 *hwaddr;
3894 int res;
3895
3896 if (!skb2) {
3897 printk(KERN_ERR DRV_NAME ": Error: "
3898 "bond_activebackup_xmit_copy(): skb_copy() failed\n");
3899 return;
3900 }
3901
3902 skb2->mac.raw = (unsigned char *)skb2->data;
3903 eth_data = eth_hdr(skb2);
3904
df49898a
JL		 3905 /* Pick an appropriate source MAC address
3906 * -- use slave's perm MAC addr, unless used by bond
3907 * -- otherwise, borrow active slave's perm MAC addr
3908 * since that will not be used
3909 */
075897ce
JL		 3910 hwaddr = slave->perm_hwaddr;
3911 if (!memcmp(eth_data->h_source, hwaddr, ETH_ALEN))
3912 hwaddr = bond->curr_active_slave->perm_hwaddr;
3913
3914 /* Set source MAC address appropriately */
3915 memcpy(eth_data->h_source, hwaddr, ETH_ALEN);
3916
3917 res = bond_dev_queue_xmit(bond, skb2, slave->dev);
3918 if (res)
3919 dev_kfree_skb(skb2);
3920
3921 return;
3922}
3923
1da177e4
LT		 3924/*
3925 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3926 * the bond has a usable interface.
3927 */
3928static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3929{
3930 struct bonding *bond = bond_dev->priv;
3931 int res = 1;
3932
1da177e4
LT		 3933 read_lock(&bond->lock);
3934 read_lock(&bond->curr_slave_lock);
3935
3936 if (!BOND_IS_OK(bond)) {
3937 goto out;
3938 }
3939
075897ce
JL		 3940 if (!bond->curr_active_slave)
3941 goto out;
3942
3943 /* Xmit IGMP frames on all slaves to ensure rapid fail-over
3944 for multicast traffic on snooping switches */
3945 if (skb->protocol == __constant_htons(ETH_P_IP) &&
3946 skb->nh.iph->protocol == IPPROTO_IGMP) {
3947 struct slave *slave, *active_slave;
3948 int i;
3949
3950 active_slave = bond->curr_active_slave;
3951 bond_for_each_slave_from_to(bond, slave, i, active_slave->next,
3952 active_slave->prev)
3953 if (IS_UP(slave->dev) &&
3954 (slave->link == BOND_LINK_UP))
3955 bond_activebackup_xmit_copy(skb, bond, slave);
1da177e4
LT		 3956 }
3957
075897ce
JL		 3958 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
3959
1da177e4
LT		 3960out:
3961 if (res) {
3962 /* no suitable interface, frame not sent */
3963 dev_kfree_skb(skb);
3964 }
3965 read_unlock(&bond->curr_slave_lock);
3966 read_unlock(&bond->lock);
3967 return 0;
3968}
3969
3970/*
169a3e66
JV		 3971 * In bond_xmit_xor() , we determine the output device by using a pre-
3972 * determined xmit_hash_policy(), If the selected device is not enabled,
3973 * find the next active slave.
1da177e4
LT		 3974 */
3975static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3976{
3977 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3978 struct slave *slave, *start_at;
3979 int slave_no;
3980 int i;
3981 int res = 1;
3982
3983 read_lock(&bond->lock);
3984
3985 if (!BOND_IS_OK(bond)) {
3986 goto out;
3987 }
3988
169a3e66 3989 slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
1da177e4
LT		 3990
3991 bond_for_each_slave(bond, slave, i) {
3992 slave_no--;
3993 if (slave_no < 0) {
3994 break;
3995 }
3996 }
3997
3998 start_at = slave;
3999
4000 bond_for_each_slave_from(bond, slave, i, start_at) {
4001 if (IS_UP(slave->dev) &&
4002 (slave->link == BOND_LINK_UP) &&
4003 (slave->state == BOND_STATE_ACTIVE)) {
4004 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4005 break;
4006 }
4007 }
4008
4009out:
4010 if (res) {
4011 /* no suitable interface, frame not sent */
4012 dev_kfree_skb(skb);
4013 }
4014 read_unlock(&bond->lock);
4015 return 0;
4016}
4017
4018/*
4019 * in broadcast mode, we send everything to all usable interfaces.
4020 */
4021static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4022{
4023 struct bonding *bond = bond_dev->priv;
4024 struct slave *slave, *start_at;
4025 struct net_device *tx_dev = NULL;
4026 int i;
4027 int res = 1;
4028
4029 read_lock(&bond->lock);
4030
4031 if (!BOND_IS_OK(bond)) {
4032 goto out;
4033 }
4034
4035 read_lock(&bond->curr_slave_lock);
4036 start_at = bond->curr_active_slave;
4037 read_unlock(&bond->curr_slave_lock);
4038
4039 if (!start_at) {
4040 goto out;
4041 }
4042
4043 bond_for_each_slave_from(bond, slave, i, start_at) {
4044 if (IS_UP(slave->dev) &&
4045 (slave->link == BOND_LINK_UP) &&
4046 (slave->state == BOND_STATE_ACTIVE)) {
4047 if (tx_dev) {
4048 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4049 if (!skb2) {
4050 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4051 ": %s: Error: bond_xmit_broadcast(): "
4052 "skb_clone() failed\n",
4053 bond_dev->name);
1da177e4
LT		 4054 continue;
4055 }
4056
4057 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4058 if (res) {
4059 dev_kfree_skb(skb2);
4060 continue;
4061 }
4062 }
4063 tx_dev = slave->dev;
4064 }
4065 }
4066
4067 if (tx_dev) {
4068 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4069 }
4070
4071out:
4072 if (res) {
4073 /* no suitable interface, frame not sent */
4074 dev_kfree_skb(skb);
4075 }
4076 /* frame sent to all suitable interfaces */
4077 read_unlock(&bond->lock);
4078 return 0;
4079}
4080
4081/*------------------------- Device initialization ---------------------------*/
4082
4083/*
4084 * set bond mode specific net device operations
4085 */
a77b5325 4086void bond_set_mode_ops(struct bonding *bond, int mode)
1da177e4 4087{
169a3e66
JV		 4088 struct net_device *bond_dev = bond->dev;
4089
1da177e4
LT		 4090 switch (mode) {
4091 case BOND_MODE_ROUNDROBIN:
4092 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4093 break;
4094 case BOND_MODE_ACTIVEBACKUP:
4095 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4096 break;
4097 case BOND_MODE_XOR:
4098 bond_dev->hard_start_xmit = bond_xmit_xor;
169a3e66
JV		 4099 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4100 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4101 else
4102 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4
LT		 4103 break;
4104 case BOND_MODE_BROADCAST:
4105 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4106 break;
4107 case BOND_MODE_8023AD:
8f903c70 4108 bond_set_master_3ad_flags(bond);
1da177e4 4109 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
169a3e66
JV		 4110 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4111 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4112 else
4113 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4 4114 break;
1da177e4 4115 case BOND_MODE_ALB:
8f903c70
JV		 4116 bond_set_master_alb_flags(bond);
4117 /* FALLTHRU */
4118 case BOND_MODE_TLB:
1da177e4
LT		 4119 bond_dev->hard_start_xmit = bond_alb_xmit;
4120 bond_dev->set_mac_address = bond_alb_set_mac_address;
4121 break;
4122 default:
4123 /* Should never happen, mode already checked */
4124 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4125 ": %s: Error: Unknown bonding mode %d\n",
4126 bond_dev->name,
1da177e4
LT		 4127 mode);
4128 break;
4129 }
4130}
4131
217df670
JV		 4132static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4133 struct ethtool_drvinfo *drvinfo)
4134{
4135 strncpy(drvinfo->driver, DRV_NAME, 32);
4136 strncpy(drvinfo->version, DRV_VERSION, 32);
4137 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4138}
4139
7282d491 4140static const struct ethtool_ops bond_ethtool_ops = {
8531c5ff 4141 .get_tx_csum = ethtool_op_get_tx_csum,
a0de3adf
JV		 4142 .get_tso = ethtool_op_get_tso,
4143 .get_ufo = ethtool_op_get_ufo,
8531c5ff 4144 .get_sg = ethtool_op_get_sg,
217df670 4145 .get_drvinfo = bond_ethtool_get_drvinfo,
8531c5ff
AK		 4146};
4147
1da177e4
LT		 4148/*
4149 * Does not allocate but creates a /proc entry.
4150 * Allowed to fail.
4151 */
3c535952 4152static int bond_init(struct net_device *bond_dev, struct bond_params *params)
1da177e4
LT		 4153{
4154 struct bonding *bond = bond_dev->priv;
4155
4156 dprintk("Begin bond_init for %s\n", bond_dev->name);
4157
4158 /* initialize rwlocks */
4159 rwlock_init(&bond->lock);
4160 rwlock_init(&bond->curr_slave_lock);
4161
4162 bond->params = *params; /* copy params struct */
4163
4164 /* Initialize pointers */
4165 bond->first_slave = NULL;
4166 bond->curr_active_slave = NULL;
4167 bond->current_arp_slave = NULL;
4168 bond->primary_slave = NULL;
4169 bond->dev = bond_dev;
4170 INIT_LIST_HEAD(&bond->vlan_list);
4171
4172 /* Initialize the device entry points */
4173 bond_dev->open = bond_open;
4174 bond_dev->stop = bond_close;
4175 bond_dev->get_stats = bond_get_stats;
4176 bond_dev->do_ioctl = bond_do_ioctl;
8531c5ff 4177 bond_dev->ethtool_ops = &bond_ethtool_ops;
1da177e4
LT		 4178 bond_dev->set_multicast_list = bond_set_multicast_list;
4179 bond_dev->change_mtu = bond_change_mtu;
4180 bond_dev->set_mac_address = bond_set_mac_address;
4181
169a3e66 4182 bond_set_mode_ops(bond, bond->params.mode);
1da177e4
LT		 4183
4184 bond_dev->destructor = free_netdev;
4185
4186 /* Initialize the device options */
4187 bond_dev->tx_queue_len = 0;
4188 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
0b680e75 4189 bond_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 4190
4191 /* At first, we block adding VLANs. That's the only way to
4192 * prevent problems that occur when adding VLANs over an
4193 * empty bond. The block will be removed once non-challenged
4194 * slaves are enslaved.
4195 */
4196 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4197
932ff279 4198 /* don't acquire bond device's netif_tx_lock when
1da177e4
LT		 4199 * transmitting */
4200 bond_dev->features |= NETIF_F_LLTX;
4201
4202 /* By default, we declare the bond to be fully
4203 * VLAN hardware accelerated capable. Special
4204 * care is taken in the various xmit functions
4205 * when there are slaves that are not hw accel
4206 * capable
4207 */
4208 bond_dev->vlan_rx_register = bond_vlan_rx_register;
4209 bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid;
4210 bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4211 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4212 NETIF_F_HW_VLAN_RX |
4213 NETIF_F_HW_VLAN_FILTER);
4214
4215#ifdef CONFIG_PROC_FS
4216 bond_create_proc_entry(bond);
4217#endif
4218
4219 list_add_tail(&bond->bond_list, &bond_dev_list);
4220
4221 return 0;
4222}
4223
4224/* De-initialize device specific data.
4225 * Caller must hold rtnl_lock.
4226 */
a77b5325 4227void bond_deinit(struct net_device *bond_dev)
1da177e4
LT		 4228{
4229 struct bonding *bond = bond_dev->priv;
4230
4231 list_del(&bond->bond_list);
4232
4233#ifdef CONFIG_PROC_FS
4234 bond_remove_proc_entry(bond);
4235#endif
4236}
4237
4238/* Unregister and free all bond devices.
4239 * Caller must hold rtnl_lock.
4240 */
4241static void bond_free_all(void)
4242{
4243 struct bonding *bond, *nxt;
4244
4245 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4246 struct net_device *bond_dev = bond->dev;
4247
70298705 4248 bond_mc_list_destroy(bond);
4249 /* Release the bonded slaves */
4250 bond_release_all(bond_dev);
1da177e4
LT		 4251 unregister_netdevice(bond_dev);
4252 bond_deinit(bond_dev);
4253 }
4254
4255#ifdef CONFIG_PROC_FS
4256 bond_destroy_proc_dir();
4257#endif
4258}
4259
4260/*------------------------- Module initialization ---------------------------*/
4261
4262/*
4263 * Convert string input module parms. Accept either the
4264 * number of the mode or its string name.
4265 */
a77b5325 4266int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
1da177e4
LT		 4267{
4268 int i;
4269
4270 for (i = 0; tbl[i].modename; i++) {
4271 if ((isdigit(*mode_arg) &&
4272 tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4273 (strncmp(mode_arg, tbl[i].modename,
4274 strlen(tbl[i].modename)) == 0)) {
4275 return tbl[i].mode;
4276 }
4277 }
4278
4279 return -1;
4280}
4281
4282static int bond_check_params(struct bond_params *params)
4283{
4284 /*
4285 * Convert string parameters.
4286 */
4287 if (mode) {
4288 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4289 if (bond_mode == -1) {
4290 printk(KERN_ERR DRV_NAME
4291 ": Error: Invalid bonding mode \"%s\"\n",
4292 mode == NULL ? "NULL" : mode);
4293 return -EINVAL;
4294 }
4295 }
4296
169a3e66
JV		 4297 if (xmit_hash_policy) {
4298 if ((bond_mode != BOND_MODE_XOR) &&
4299 (bond_mode != BOND_MODE_8023AD)) {
4300 printk(KERN_INFO DRV_NAME
4301 ": xor_mode param is irrelevant in mode %s\n",
4302 bond_mode_name(bond_mode));
4303 } else {
4304 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4305 xmit_hashtype_tbl);
4306 if (xmit_hashtype == -1) {
4307 printk(KERN_ERR DRV_NAME
4308 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4309 xmit_hash_policy == NULL ? "NULL" :
4310 xmit_hash_policy);
4311 return -EINVAL;
4312 }
4313 }
4314 }
4315
1da177e4
LT		 4316 if (lacp_rate) {
4317 if (bond_mode != BOND_MODE_8023AD) {
4318 printk(KERN_INFO DRV_NAME
4319 ": lacp_rate param is irrelevant in mode %s\n",
4320 bond_mode_name(bond_mode));
4321 } else {
4322 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4323 if (lacp_fast == -1) {
4324 printk(KERN_ERR DRV_NAME
4325 ": Error: Invalid lacp rate \"%s\"\n",
4326 lacp_rate == NULL ? "NULL" : lacp_rate);
4327 return -EINVAL;
4328 }
4329 }
4330 }
4331
4332 if (max_bonds < 1 || max_bonds > INT_MAX) {
4333 printk(KERN_WARNING DRV_NAME
4334 ": Warning: max_bonds (%d) not in range %d-%d, so it "
4e0952c7 4335 "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
1da177e4
LT		 4336 max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4337 max_bonds = BOND_DEFAULT_MAX_BONDS;
4338 }
4339
4340 if (miimon < 0) {
4341 printk(KERN_WARNING DRV_NAME
4342 ": Warning: miimon module parameter (%d), "
4343 "not in range 0-%d, so it was reset to %d\n",
4344 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4345 miimon = BOND_LINK_MON_INTERV;
4346 }
4347
4348 if (updelay < 0) {
4349 printk(KERN_WARNING DRV_NAME
4350 ": Warning: updelay module parameter (%d), "
4351 "not in range 0-%d, so it was reset to 0\n",
4352 updelay, INT_MAX);
4353 updelay = 0;
4354 }
4355
4356 if (downdelay < 0) {
4357 printk(KERN_WARNING DRV_NAME
4358 ": Warning: downdelay module parameter (%d), "
4359 "not in range 0-%d, so it was reset to 0\n",
4360 downdelay, INT_MAX);
4361 downdelay = 0;
4362 }
4363
4364 if ((use_carrier != 0) && (use_carrier != 1)) {
4365 printk(KERN_WARNING DRV_NAME
4366 ": Warning: use_carrier module parameter (%d), "
4367 "not of valid value (0/1), so it was set to 1\n",
4368 use_carrier);
4369 use_carrier = 1;
4370 }
4371
4372 /* reset values for 802.3ad */
4373 if (bond_mode == BOND_MODE_8023AD) {
4374 if (!miimon) {
4375 printk(KERN_WARNING DRV_NAME
4376 ": Warning: miimon must be specified, "
4377 "otherwise bonding will not detect link "
4378 "failure, speed and duplex which are "
4379 "essential for 802.3ad operation\n");
4380 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4381 miimon = 100;
4382 }
4383 }
4384
4385 /* reset values for TLB/ALB */
4386 if ((bond_mode == BOND_MODE_TLB) ||
4387 (bond_mode == BOND_MODE_ALB)) {
4388 if (!miimon) {
4389 printk(KERN_WARNING DRV_NAME
4390 ": Warning: miimon must be specified, "
4391 "otherwise bonding will not detect link "
4392 "failure and link speed which are essential "
4393 "for TLB/ALB load balancing\n");
4394 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4395 miimon = 100;
4396 }
4397 }
4398
4399 if (bond_mode == BOND_MODE_ALB) {
4400 printk(KERN_NOTICE DRV_NAME
4401 ": In ALB mode you might experience client "
4402 "disconnections upon reconnection of a link if the "
4403 "bonding module updelay parameter (%d msec) is "
4404 "incompatible with the forwarding delay time of the "
4405 "switch\n",
4406 updelay);
4407 }
4408
4409 if (!miimon) {
4410 if (updelay || downdelay) {
4411 /* just warn the user the up/down delay will have
4412 * no effect since miimon is zero...
4413 */
4414 printk(KERN_WARNING DRV_NAME
4415 ": Warning: miimon module parameter not set "
4416 "and updelay (%d) or downdelay (%d) module "
4417 "parameter is set; updelay and downdelay have "
4418 "no effect unless miimon is set\n",
4419 updelay, downdelay);
4420 }
4421 } else {
4422 /* don't allow arp monitoring */
4423 if (arp_interval) {
4424 printk(KERN_WARNING DRV_NAME
4425 ": Warning: miimon (%d) and arp_interval (%d) "
4426 "can't be used simultaneously, disabling ARP "
4427 "monitoring\n",
4428 miimon, arp_interval);
4429 arp_interval = 0;
4430 }
4431
4432 if ((updelay % miimon) != 0) {
4433 printk(KERN_WARNING DRV_NAME
4434 ": Warning: updelay (%d) is not a multiple "
4435 "of miimon (%d), updelay rounded to %d ms\n",
4436 updelay, miimon, (updelay / miimon) * miimon);
4437 }
4438
4439 updelay /= miimon;
4440
4441 if ((downdelay % miimon) != 0) {
4442 printk(KERN_WARNING DRV_NAME
4443 ": Warning: downdelay (%d) is not a multiple "
4444 "of miimon (%d), downdelay rounded to %d ms\n",
4445 downdelay, miimon,
4446 (downdelay / miimon) * miimon);
4447 }
4448
4449 downdelay /= miimon;
4450 }
4451
4452 if (arp_interval < 0) {
4453 printk(KERN_WARNING DRV_NAME
4454 ": Warning: arp_interval module parameter (%d) "
4455 ", not in range 0-%d, so it was reset to %d\n",
4456 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4457 arp_interval = BOND_LINK_ARP_INTERV;
4458 }
4459
4460 for (arp_ip_count = 0;
4461 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4462 arp_ip_count++) {
4463 /* not complete check, but should be good enough to
4464 catch mistakes */
4465 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4466 printk(KERN_WARNING DRV_NAME
4467 ": Warning: bad arp_ip_target module parameter "
4468 "(%s), ARP monitoring will not be performed\n",
4469 arp_ip_target[arp_ip_count]);
4470 arp_interval = 0;
4471 } else {
4472 u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4473 arp_target[arp_ip_count] = ip;
4474 }
4475 }
4476
4477 if (arp_interval && !arp_ip_count) {
4478 /* don't allow arping if no arp_ip_target given... */
4479 printk(KERN_WARNING DRV_NAME
4480 ": Warning: arp_interval module parameter (%d) "
4481 "specified without providing an arp_ip_target "
4482 "parameter, arp_interval was reset to 0\n",
4483 arp_interval);
4484 arp_interval = 0;
4485 }
4486
4487 if (miimon) {
4488 printk(KERN_INFO DRV_NAME
4489 ": MII link monitoring set to %d ms\n",
4490 miimon);
4491 } else if (arp_interval) {
4492 int i;
4493
4494 printk(KERN_INFO DRV_NAME
4495 ": ARP monitoring set to %d ms with %d target(s):",
4496 arp_interval, arp_ip_count);
4497
4498 for (i = 0; i < arp_ip_count; i++)
4499 printk (" %s", arp_ip_target[i]);
4500
4501 printk("\n");
4502
4503 } else {
4504 /* miimon and arp_interval not set, we need one so things
4505 * work as expected, see bonding.txt for details
4506 */
4507 printk(KERN_WARNING DRV_NAME
4508 ": Warning: either miimon or arp_interval and "
4509 "arp_ip_target module parameters must be specified, "
4510 "otherwise bonding will not detect link failures! see "
4511 "bonding.txt for details.\n");
4512 }
4513
4514 if (primary && !USES_PRIMARY(bond_mode)) {
4515 /* currently, using a primary only makes sense
4516 * in active backup, TLB or ALB modes
4517 */
4518 printk(KERN_WARNING DRV_NAME
4519 ": Warning: %s primary device specified but has no "
4520 "effect in %s mode\n",
4521 primary, bond_mode_name(bond_mode));
4522 primary = NULL;
4523 }
4524
4525 /* fill params struct with the proper values */
4526 params->mode = bond_mode;
169a3e66 4527 params->xmit_policy = xmit_hashtype;
1da177e4
LT		 4528 params->miimon = miimon;
4529 params->arp_interval = arp_interval;
4530 params->updelay = updelay;
4531 params->downdelay = downdelay;
4532 params->use_carrier = use_carrier;
4533 params->lacp_fast = lacp_fast;
4534 params->primary[0] = 0;
4535
4536 if (primary) {
4537 strncpy(params->primary, primary, IFNAMSIZ);
4538 params->primary[IFNAMSIZ - 1] = 0;
4539 }
4540
4541 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4542
4543 return 0;
4544}
4545
dfe60397
MW		 4546/* Create a new bond based on the specified name and bonding parameters.
4547 * Caller must NOT hold rtnl_lock; we need to release it here before we
4548 * set up our sysfs entries.
4549 */
4550int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4551{
4552 struct net_device *bond_dev;
4553 int res;
4554
4555 rtnl_lock();
4556 bond_dev = alloc_netdev(sizeof(struct bonding), name, ether_setup);
4557 if (!bond_dev) {
4558 printk(KERN_ERR DRV_NAME
4559 ": %s: eek! can't alloc netdev!\n",
4560 name);
4561 res = -ENOMEM;
4562 goto out_rtnl;
4563 }
4564
4565 /* bond_init() must be called after dev_alloc_name() (for the
4566 * /proc files), but before register_netdevice(), because we
4567 * need to set function pointers.
4568 */
4569
4570 res = bond_init(bond_dev, params);
4571 if (res < 0) {
4572 goto out_netdev;
4573 }
4574
4575 SET_MODULE_OWNER(bond_dev);
4576
4577 res = register_netdevice(bond_dev);
4578 if (res < 0) {
4579 goto out_bond;
4580 }
4581 if (newbond)
4582 *newbond = bond_dev->priv;
4583
ff59c456
JV		 4584 netif_carrier_off(bond_dev);
4585
dfe60397 4586 rtnl_unlock(); /* allows sysfs registration of net device */
b76cdba9 4587 res = bond_create_sysfs_entry(bond_dev->priv);
dfe60397
MW		 4588 goto done;
4589out_bond:
4590 bond_deinit(bond_dev);
4591out_netdev:
4592 free_netdev(bond_dev);
4593out_rtnl:
4594 rtnl_unlock();
4595done:
4596 return res;
4597}
4598
1da177e4
LT		 4599static int __init bonding_init(void)
4600{
1da177e4
LT		 4601 int i;
4602 int res;
dfe60397 4603 char new_bond_name[8]; /* Enough room for 999 bonds at init. */
1da177e4
LT		 4604
4605 printk(KERN_INFO "%s", version);
4606
dfe60397 4607 res = bond_check_params(&bonding_defaults);
1da177e4 4608 if (res) {
dfe60397 4609 goto out;
1da177e4
LT		 4610 }
4611
1da177e4
LT		 4612#ifdef CONFIG_PROC_FS
4613 bond_create_proc_dir();
4614#endif
1da177e4 4615 for (i = 0; i < max_bonds; i++) {
dfe60397
MW		 4616 sprintf(new_bond_name, "bond%d",i);
4617 res = bond_create(new_bond_name,&bonding_defaults, NULL);
4618 if (res)
4619 goto err;
1da177e4
LT		 4620 }
4621
b76cdba9
MW		 4622 res = bond_create_sysfs();
4623 if (res)
4624 goto err;
4625
1da177e4 4626 register_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4627 register_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4 4628
dfe60397
MW		 4629 goto out;
4630err:
40abc270 4631 rtnl_lock();
1da177e4 4632 bond_free_all();
b76cdba9 4633 bond_destroy_sysfs();
1da177e4 4634 rtnl_unlock();
dfe60397 4635out:
1da177e4 4636 return res;
dfe60397 4637
1da177e4
LT		 4638}
4639
4640static void __exit bonding_exit(void)
4641{
4642 unregister_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4643 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4
LT		 4644
4645 rtnl_lock();
4646 bond_free_all();
b76cdba9 4647 bond_destroy_sysfs();
1da177e4
LT		 4648 rtnl_unlock();
4649}
4650
4651module_init(bonding_init);
4652module_exit(bonding_exit);
4653MODULE_LICENSE("GPL");
4654MODULE_VERSION(DRV_VERSION);
4655MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4656MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4657MODULE_SUPPORTED_DEVICE("most ethernet devices");
4658
4659/*
4660 * Local variables:
4661 * c-indent-level: 8
4662 * c-basic-offset: 8
4663 * tab-width: 8
4664 * End:
4665 */
4666
Clone of davem's net-next-2.6 tree