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[PATCH] bonding: Handle large hard_header_len
[net-next-2.6.git] / drivers / net / bonding / bond_main.c
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1da177e4
LT		 1/*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
1da177e4
LT		 32 */
33
34//#define BONDING_DEBUG 1
35
1da177e4
LT		 36#include <linux/kernel.h>
37#include <linux/module.h>
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;
1374
1375 if ((bond->params.mode == BOND_MODE_TLB) ||
1376 (bond->params.mode == BOND_MODE_ALB)) {
1377 /* bond_alb_init_slave() must be called before all other stages since
1378 * it might fail and we do not want to have to undo everything
1379 */
1380 res = bond_alb_init_slave(bond, new_slave);
1381 if (res) {
1382 goto err_unset_master;
1383 }
1384 }
1385
1386 /* If the mode USES_PRIMARY, then the new slave gets the
1387 * master's promisc (and mc) settings only if it becomes the
1388 * curr_active_slave, and that is taken care of later when calling
1389 * bond_change_active()
1390 */
1391 if (!USES_PRIMARY(bond->params.mode)) {
1392 /* set promiscuity level to new slave */
1393 if (bond_dev->flags & IFF_PROMISC) {
1394 dev_set_promiscuity(slave_dev, 1);
1395 }
1396
1397 /* set allmulti level to new slave */
1398 if (bond_dev->flags & IFF_ALLMULTI) {
1399 dev_set_allmulti(slave_dev, 1);
1400 }
1401
1402 /* upload master's mc_list to new slave */
1403 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1404 dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1405 }
1406 }
1407
1408 if (bond->params.mode == BOND_MODE_8023AD) {
1409 /* add lacpdu mc addr to mc list */
1410 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1411
1412 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1413 }
1414
1415 bond_add_vlans_on_slave(bond, slave_dev);
1416
1417 write_lock_bh(&bond->lock);
1418
1419 bond_attach_slave(bond, new_slave);
1420
1421 new_slave->delay = 0;
1422 new_slave->link_failure_count = 0;
1423
8531c5ff
AK		 1424 bond_compute_features(bond);
1425
1da177e4
LT		 1426 if (bond->params.miimon && !bond->params.use_carrier) {
1427 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1428
1429 if ((link_reporting == -1) && !bond->params.arp_interval) {
1430 /*
1431 * miimon is set but a bonded network driver
1432 * does not support ETHTOOL/MII and
1433 * arp_interval is not set. Note: if
1434 * use_carrier is enabled, we will never go
1435 * here (because netif_carrier is always
1436 * supported); thus, we don't need to change
1437 * the messages for netif_carrier.
1438 */
1439 printk(KERN_WARNING DRV_NAME
4e0952c7 1440 ": %s: Warning: MII and ETHTOOL support not "
1da177e4
LT		 1441 "available for interface %s, and "
1442 "arp_interval/arp_ip_target module parameters "
1443 "not specified, thus bonding will not detect "
1444 "link failures! see bonding.txt for details.\n",
4e0952c7 1445 bond_dev->name, slave_dev->name);
1da177e4
LT		 1446 } else if (link_reporting == -1) {
1447 /* unable get link status using mii/ethtool */
1448 printk(KERN_WARNING DRV_NAME
4e0952c7 1449 ": %s: Warning: can't get link status from "
1da177e4
LT		 1450 "interface %s; the network driver associated "
1451 "with this interface does not support MII or "
1452 "ETHTOOL link status reporting, thus miimon "
1453 "has no effect on this interface.\n",
4e0952c7 1454 bond_dev->name, slave_dev->name);
1da177e4
LT		 1455 }
1456 }
1457
1458 /* check for initial state */
1459 if (!bond->params.miimon ||
1460 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1461 if (bond->params.updelay) {
1462 dprintk("Initial state of slave_dev is "
1463 "BOND_LINK_BACK\n");
1464 new_slave->link = BOND_LINK_BACK;
1465 new_slave->delay = bond->params.updelay;
1466 } else {
1467 dprintk("Initial state of slave_dev is "
1468 "BOND_LINK_UP\n");
1469 new_slave->link = BOND_LINK_UP;
1470 }
1471 new_slave->jiffies = jiffies;
1472 } else {
1473 dprintk("Initial state of slave_dev is "
1474 "BOND_LINK_DOWN\n");
1475 new_slave->link = BOND_LINK_DOWN;
1476 }
1477
1478 if (bond_update_speed_duplex(new_slave) &&
1479 (new_slave->link != BOND_LINK_DOWN)) {
1480 printk(KERN_WARNING DRV_NAME
4e0952c7 1481 ": %s: Warning: failed to get speed and duplex from %s, "
1da177e4 1482 "assumed to be 100Mb/sec and Full.\n",
4e0952c7 1483 bond_dev->name, new_slave->dev->name);
1da177e4
LT		 1484
1485 if (bond->params.mode == BOND_MODE_8023AD) {
4e0952c7
MW		 1486 printk(KERN_WARNING DRV_NAME
1487 ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1da177e4 1488 "support in base driver for proper aggregator "
4e0952c7 1489 "selection.\n", bond_dev->name);
1da177e4
LT		 1490 }
1491 }
1492
1493 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1494 /* if there is a primary slave, remember it */
1495 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1496 bond->primary_slave = new_slave;
1497 }
1498 }
1499
1500 switch (bond->params.mode) {
1501 case BOND_MODE_ACTIVEBACKUP:
8f903c70
JV		 1502 /* if we're in active-backup mode, we need one and
1503 * only one active interface. The backup interfaces
1504 * will have their SLAVE_INACTIVE flag set because we
1505 * need them to be drop all packets. Thus, since we
1506 * guarantee that curr_active_slave always point to
1507 * the last usable interface, we just have to verify
1508 * this interface's flag.
1da177e4
LT		 1509 */
1510 if (((!bond->curr_active_slave) ||
8f903c70 1511 (bond->curr_active_slave->dev->priv_flags & IFF_SLAVE_INACTIVE)) &&
1da177e4 1512 (new_slave->link != BOND_LINK_DOWN)) {
1da177e4
LT		 1513 /* first slave or no active slave yet, and this link
1514 is OK, so make this interface the active one */
1515 bond_change_active_slave(bond, new_slave);
ff59c456
JV		 1516 printk(KERN_INFO DRV_NAME
1517 ": %s: first active interface up!\n",
1518 bond->dev->name);
1519 netif_carrier_on(bond->dev);
1520
1da177e4
LT		 1521 } else {
1522 dprintk("This is just a backup slave\n");
1523 bond_set_slave_inactive_flags(new_slave);
1524 }
1525 break;
1526 case BOND_MODE_8023AD:
1527 /* in 802.3ad mode, the internal mechanism
1528 * will activate the slaves in the selected
1529 * aggregator
1530 */
1531 bond_set_slave_inactive_flags(new_slave);
1532 /* if this is the first slave */
1533 if (bond->slave_cnt == 1) {
1534 SLAVE_AD_INFO(new_slave).id = 1;
1535 /* Initialize AD with the number of times that the AD timer is called in 1 second
1536 * can be called only after the mac address of the bond is set
1537 */
1538 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1539 bond->params.lacp_fast);
1540 } else {
1541 SLAVE_AD_INFO(new_slave).id =
1542 SLAVE_AD_INFO(new_slave->prev).id + 1;
1543 }
1544
1545 bond_3ad_bind_slave(new_slave);
1546 break;
1547 case BOND_MODE_TLB:
1548 case BOND_MODE_ALB:
1549 new_slave->state = BOND_STATE_ACTIVE;
1550 if ((!bond->curr_active_slave) &&
1551 (new_slave->link != BOND_LINK_DOWN)) {
1552 /* first slave or no active slave yet, and this link
1553 * is OK, so make this interface the active one
1554 */
1555 bond_change_active_slave(bond, new_slave);
8f903c70
JV		 1556 } else {
1557 bond_set_slave_inactive_flags(new_slave);
1da177e4
LT		 1558 }
1559 break;
1560 default:
1561 dprintk("This slave is always active in trunk mode\n");
1562
1563 /* always active in trunk mode */
1564 new_slave->state = BOND_STATE_ACTIVE;
1565
1566 /* In trunking mode there is little meaning to curr_active_slave
1567 * anyway (it holds no special properties of the bond device),
1568 * so we can change it without calling change_active_interface()
1569 */
1570 if (!bond->curr_active_slave) {
1571 bond->curr_active_slave = new_slave;
1572 }
1573 break;
1574 } /* switch(bond_mode) */
1575
ff59c456
JV		 1576 bond_set_carrier(bond);
1577
1da177e4
LT		 1578 write_unlock_bh(&bond->lock);
1579
b76cdba9
MW		 1580 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1581 if (res)
1582 goto err_unset_master;
1583
1da177e4
LT		 1584 printk(KERN_INFO DRV_NAME
1585 ": %s: enslaving %s as a%s interface with a%s link.\n",
1586 bond_dev->name, slave_dev->name,
1587 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1588 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1589
1590 /* enslave is successful */
1591 return 0;
1592
1593/* Undo stages on error */
1594err_unset_master:
1595 netdev_set_master(slave_dev, NULL);
1596
1597err_close:
1598 dev_close(slave_dev);
1599
1600err_restore_mac:
1601 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1602 addr.sa_family = slave_dev->type;
1603 dev_set_mac_address(slave_dev, &addr);
1604
1605err_free:
1606 kfree(new_slave);
1607
1608err_undo_flags:
1609 bond_dev->features = old_features;
8531c5ff 1610
1da177e4
LT		 1611 return res;
1612}
1613
1614/*
1615 * Try to release the slave device <slave> from the bond device <master>
1616 * It is legal to access curr_active_slave without a lock because all the function
1617 * is write-locked.
1618 *
1619 * The rules for slave state should be:
1620 * for Active/Backup:
1621 * Active stays on all backups go down
1622 * for Bonded connections:
1623 * The first up interface should be left on and all others downed.
1624 */
a77b5325 1625int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1626{
1627 struct bonding *bond = bond_dev->priv;
1628 struct slave *slave, *oldcurrent;
1629 struct sockaddr addr;
1630 int mac_addr_differ;
1631
1632 /* slave is not a slave or master is not master of this slave */
1633 if (!(slave_dev->flags & IFF_SLAVE) ||
1634 (slave_dev->master != bond_dev)) {
1635 printk(KERN_ERR DRV_NAME
4e0952c7 1636 ": %s: Error: cannot release %s.\n",
1da177e4
LT		 1637 bond_dev->name, slave_dev->name);
1638 return -EINVAL;
1639 }
1640
1641 write_lock_bh(&bond->lock);
1642
1643 slave = bond_get_slave_by_dev(bond, slave_dev);
1644 if (!slave) {
1645 /* not a slave of this bond */
1646 printk(KERN_INFO DRV_NAME
1647 ": %s: %s not enslaved\n",
1648 bond_dev->name, slave_dev->name);
f5e2a7b2 1649 write_unlock_bh(&bond->lock);
1da177e4
LT		 1650 return -EINVAL;
1651 }
1652
1653 mac_addr_differ = memcmp(bond_dev->dev_addr,
1654 slave->perm_hwaddr,
1655 ETH_ALEN);
1656 if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1657 printk(KERN_WARNING DRV_NAME
4e0952c7 1658 ": %s: Warning: the permanent HWaddr of %s "
1da177e4
LT		 1659 "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1660 "still in use by %s. Set the HWaddr of "
1661 "%s to a different address to avoid "
1662 "conflicts.\n",
4e0952c7 1663 bond_dev->name,
1da177e4
LT		 1664 slave_dev->name,
1665 slave->perm_hwaddr[0],
1666 slave->perm_hwaddr[1],
1667 slave->perm_hwaddr[2],
1668 slave->perm_hwaddr[3],
1669 slave->perm_hwaddr[4],
1670 slave->perm_hwaddr[5],
1671 bond_dev->name,
1672 slave_dev->name);
1673 }
1674
1675 /* Inform AD package of unbinding of slave. */
1676 if (bond->params.mode == BOND_MODE_8023AD) {
1677 /* must be called before the slave is
1678 * detached from the list
1679 */
1680 bond_3ad_unbind_slave(slave);
1681 }
1682
1683 printk(KERN_INFO DRV_NAME
1684 ": %s: releasing %s interface %s\n",
1685 bond_dev->name,
1686 (slave->state == BOND_STATE_ACTIVE)
1687 ? "active" : "backup",
1688 slave_dev->name);
1689
1690 oldcurrent = bond->curr_active_slave;
1691
1692 bond->current_arp_slave = NULL;
1693
1694 /* release the slave from its bond */
1695 bond_detach_slave(bond, slave);
1696
8531c5ff
AK		 1697 bond_compute_features(bond);
1698
1da177e4
LT		 1699 if (bond->primary_slave == slave) {
1700 bond->primary_slave = NULL;
1701 }
1702
1703 if (oldcurrent == slave) {
1704 bond_change_active_slave(bond, NULL);
1705 }
1706
1707 if ((bond->params.mode == BOND_MODE_TLB) ||
1708 (bond->params.mode == BOND_MODE_ALB)) {
1709 /* Must be called only after the slave has been
1710 * detached from the list and the curr_active_slave
1711 * has been cleared (if our_slave == old_current),
1712 * but before a new active slave is selected.
1713 */
1714 bond_alb_deinit_slave(bond, slave);
1715 }
1716
ff59c456 1717 if (oldcurrent == slave)
1da177e4
LT		 1718 bond_select_active_slave(bond);
1719
1da177e4 1720 if (bond->slave_cnt == 0) {
ff59c456
JV		 1721 bond_set_carrier(bond);
1722
1da177e4
LT		 1723 /* if the last slave was removed, zero the mac address
1724 * of the master so it will be set by the application
1725 * to the mac address of the first slave
1726 */
1727 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1728
1729 if (list_empty(&bond->vlan_list)) {
1730 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1731 } else {
1732 printk(KERN_WARNING DRV_NAME
4e0952c7 1733 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1734 "still has VLANs.\n",
4e0952c7 1735 bond_dev->name, bond_dev->name);
1da177e4 1736 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1737 ": %s: When re-adding slaves, make sure the bond's "
1738 "HW address matches its VLANs'.\n",
1739 bond_dev->name);
1da177e4
LT		 1740 }
1741 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1742 !bond_has_challenged_slaves(bond)) {
1743 printk(KERN_INFO DRV_NAME
4e0952c7 1744 ": %s: last VLAN challenged slave %s "
1da177e4 1745 "left bond %s. VLAN blocking is removed\n",
4e0952c7 1746 bond_dev->name, slave_dev->name, bond_dev->name);
1da177e4
LT		 1747 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1748 }
1749
1750 write_unlock_bh(&bond->lock);
1751
b76cdba9
MW		 1752 /* must do this from outside any spinlocks */
1753 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1754
1da177e4
LT		 1755 bond_del_vlans_from_slave(bond, slave_dev);
1756
1757 /* If the mode USES_PRIMARY, then we should only remove its
1758 * promisc and mc settings if it was the curr_active_slave, but that was
1759 * already taken care of above when we detached the slave
1760 */
1761 if (!USES_PRIMARY(bond->params.mode)) {
1762 /* unset promiscuity level from slave */
1763 if (bond_dev->flags & IFF_PROMISC) {
1764 dev_set_promiscuity(slave_dev, -1);
1765 }
1766
1767 /* unset allmulti level from slave */
1768 if (bond_dev->flags & IFF_ALLMULTI) {
1769 dev_set_allmulti(slave_dev, -1);
1770 }
1771
1772 /* flush master's mc_list from slave */
1773 bond_mc_list_flush(bond_dev, slave_dev);
1774 }
1775
1776 netdev_set_master(slave_dev, NULL);
1777
1778 /* close slave before restoring its mac address */
1779 dev_close(slave_dev);
1780
217df670
JV		 1781 /* restore original ("permanent") mac address */
1782 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1783 addr.sa_family = slave_dev->type;
1784 dev_set_mac_address(slave_dev, &addr);
1da177e4 1785
8f903c70
JV		 1786 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1787 IFF_SLAVE_INACTIVE);
1da177e4
LT		 1788
1789 kfree(slave);
1790
1791 return 0; /* deletion OK */
1792}
1793
1794/*
1795 * This function releases all slaves.
1796 */
1797static int bond_release_all(struct net_device *bond_dev)
1798{
1799 struct bonding *bond = bond_dev->priv;
1800 struct slave *slave;
1801 struct net_device *slave_dev;
1802 struct sockaddr addr;
1803
1804 write_lock_bh(&bond->lock);
1805
ff59c456
JV		 1806 netif_carrier_off(bond_dev);
1807
1da177e4
LT		 1808 if (bond->slave_cnt == 0) {
1809 goto out;
1810 }
1811
1812 bond->current_arp_slave = NULL;
1813 bond->primary_slave = NULL;
1814 bond_change_active_slave(bond, NULL);
1815
1816 while ((slave = bond->first_slave) != NULL) {
1817 /* Inform AD package of unbinding of slave
1818 * before slave is detached from the list.
1819 */
1820 if (bond->params.mode == BOND_MODE_8023AD) {
1821 bond_3ad_unbind_slave(slave);
1822 }
1823
1824 slave_dev = slave->dev;
1825 bond_detach_slave(bond, slave);
1826
1827 if ((bond->params.mode == BOND_MODE_TLB) ||
1828 (bond->params.mode == BOND_MODE_ALB)) {
1829 /* must be called only after the slave
1830 * has been detached from the list
1831 */
1832 bond_alb_deinit_slave(bond, slave);
1833 }
1834
8531c5ff
AK		 1835 bond_compute_features(bond);
1836
1da177e4
LT		 1837 /* now that the slave is detached, unlock and perform
1838 * all the undo steps that should not be called from
1839 * within a lock.
1840 */
1841 write_unlock_bh(&bond->lock);
1842
b76cdba9 1843 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1da177e4
LT		 1844 bond_del_vlans_from_slave(bond, slave_dev);
1845
1846 /* If the mode USES_PRIMARY, then we should only remove its
1847 * promisc and mc settings if it was the curr_active_slave, but that was
1848 * already taken care of above when we detached the slave
1849 */
1850 if (!USES_PRIMARY(bond->params.mode)) {
1851 /* unset promiscuity level from slave */
1852 if (bond_dev->flags & IFF_PROMISC) {
1853 dev_set_promiscuity(slave_dev, -1);
1854 }
1855
1856 /* unset allmulti level from slave */
1857 if (bond_dev->flags & IFF_ALLMULTI) {
1858 dev_set_allmulti(slave_dev, -1);
1859 }
1860
1861 /* flush master's mc_list from slave */
1862 bond_mc_list_flush(bond_dev, slave_dev);
1863 }
1864
1865 netdev_set_master(slave_dev, NULL);
1866
1867 /* close slave before restoring its mac address */
1868 dev_close(slave_dev);
1869
217df670
JV		 1870 /* restore original ("permanent") mac address*/
1871 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1872 addr.sa_family = slave_dev->type;
1873 dev_set_mac_address(slave_dev, &addr);
1da177e4 1874
8f903c70
JV		 1875 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1876 IFF_SLAVE_INACTIVE);
1da177e4
LT		 1877
1878 kfree(slave);
1879
1880 /* re-acquire the lock before getting the next slave */
1881 write_lock_bh(&bond->lock);
1882 }
1883
1884 /* zero the mac address of the master so it will be
1885 * set by the application to the mac address of the
1886 * first slave
1887 */
1888 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1889
1890 if (list_empty(&bond->vlan_list)) {
1891 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1892 } else {
1893 printk(KERN_WARNING DRV_NAME
4e0952c7 1894 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1895 "still has VLANs.\n",
4e0952c7 1896 bond_dev->name, bond_dev->name);
1da177e4 1897 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1898 ": %s: When re-adding slaves, make sure the bond's "
1899 "HW address matches its VLANs'.\n",
1900 bond_dev->name);
1da177e4
LT		 1901 }
1902
1903 printk(KERN_INFO DRV_NAME
1904 ": %s: released all slaves\n",
1905 bond_dev->name);
1906
1907out:
1908 write_unlock_bh(&bond->lock);
1909
1910 return 0;
1911}
1912
1913/*
1914 * This function changes the active slave to slave <slave_dev>.
1915 * It returns -EINVAL in the following cases.
1916 * - <slave_dev> is not found in the list.
1917 * - There is not active slave now.
1918 * - <slave_dev> is already active.
1919 * - The link state of <slave_dev> is not BOND_LINK_UP.
1920 * - <slave_dev> is not running.
1921 * In these cases, this fuction does nothing.
1922 * In the other cases, currnt_slave pointer is changed and 0 is returned.
1923 */
1924static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1925{
1926 struct bonding *bond = bond_dev->priv;
1927 struct slave *old_active = NULL;
1928 struct slave *new_active = NULL;
1929 int res = 0;
1930
1931 if (!USES_PRIMARY(bond->params.mode)) {
1932 return -EINVAL;
1933 }
1934
1935 /* Verify that master_dev is indeed the master of slave_dev */
1936 if (!(slave_dev->flags & IFF_SLAVE) ||
1937 (slave_dev->master != bond_dev)) {
1938 return -EINVAL;
1939 }
1940
1941 write_lock_bh(&bond->lock);
1942
1943 old_active = bond->curr_active_slave;
1944 new_active = bond_get_slave_by_dev(bond, slave_dev);
1945
1946 /*
1947 * Changing to the current active: do nothing; return success.
1948 */
1949 if (new_active && (new_active == old_active)) {
1950 write_unlock_bh(&bond->lock);
1951 return 0;
1952 }
1953
1954 if ((new_active) &&
1955 (old_active) &&
1956 (new_active->link == BOND_LINK_UP) &&
1957 IS_UP(new_active->dev)) {
1958 bond_change_active_slave(bond, new_active);
1959 } else {
1960 res = -EINVAL;
1961 }
1962
1963 write_unlock_bh(&bond->lock);
1964
1965 return res;
1966}
1967
1da177e4
LT		 1968static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1969{
1970 struct bonding *bond = bond_dev->priv;
1971
1972 info->bond_mode = bond->params.mode;
1973 info->miimon = bond->params.miimon;
1974
1975 read_lock_bh(&bond->lock);
1976 info->num_slaves = bond->slave_cnt;
1977 read_unlock_bh(&bond->lock);
1978
1979 return 0;
1980}
1981
1982static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1983{
1984 struct bonding *bond = bond_dev->priv;
1985 struct slave *slave;
1986 int i, found = 0;
1987
1988 if (info->slave_id < 0) {
1989 return -ENODEV;
1990 }
1991
1992 read_lock_bh(&bond->lock);
1993
1994 bond_for_each_slave(bond, slave, i) {
1995 if (i == (int)info->slave_id) {
1996 found = 1;
1997 break;
1998 }
1999 }
2000
2001 read_unlock_bh(&bond->lock);
2002
2003 if (found) {
2004 strcpy(info->slave_name, slave->dev->name);
2005 info->link = slave->link;
2006 info->state = slave->state;
2007 info->link_failure_count = slave->link_failure_count;
2008 } else {
2009 return -ENODEV;
2010 }
2011
2012 return 0;
2013}
2014
2015/*-------------------------------- Monitoring -------------------------------*/
2016
2017/* this function is called regularly to monitor each slave's link. */
a77b5325 2018void bond_mii_monitor(struct net_device *bond_dev)
1da177e4
LT		 2019{
2020 struct bonding *bond = bond_dev->priv;
2021 struct slave *slave, *oldcurrent;
2022 int do_failover = 0;
2023 int delta_in_ticks;
2024 int i;
2025
2026 read_lock(&bond->lock);
2027
2028 delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2029
2030 if (bond->kill_timers) {
2031 goto out;
2032 }
2033
2034 if (bond->slave_cnt == 0) {
2035 goto re_arm;
2036 }
2037
2038 /* we will try to read the link status of each of our slaves, and
2039 * set their IFF_RUNNING flag appropriately. For each slave not
2040 * supporting MII status, we won't do anything so that a user-space
2041 * program could monitor the link itself if needed.
2042 */
2043
2044 read_lock(&bond->curr_slave_lock);
2045 oldcurrent = bond->curr_active_slave;
2046 read_unlock(&bond->curr_slave_lock);
2047
2048 bond_for_each_slave(bond, slave, i) {
2049 struct net_device *slave_dev = slave->dev;
2050 int link_state;
2051 u16 old_speed = slave->speed;
2052 u8 old_duplex = slave->duplex;
2053
2054 link_state = bond_check_dev_link(bond, slave_dev, 0);
2055
2056 switch (slave->link) {
2057 case BOND_LINK_UP: /* the link was up */
2058 if (link_state == BMSR_LSTATUS) {
2059 /* link stays up, nothing more to do */
2060 break;
2061 } else { /* link going down */
2062 slave->link = BOND_LINK_FAIL;
2063 slave->delay = bond->params.downdelay;
2064
2065 if (slave->link_failure_count < UINT_MAX) {
2066 slave->link_failure_count++;
2067 }
2068
2069 if (bond->params.downdelay) {
2070 printk(KERN_INFO DRV_NAME
2071 ": %s: link status down for %s "
2072 "interface %s, disabling it in "
2073 "%d ms.\n",
2074 bond_dev->name,
2075 IS_UP(slave_dev)
2076 ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2077 ? ((slave == oldcurrent)
2078 ? "active " : "backup ")
2079 : "")
2080 : "idle ",
2081 slave_dev->name,
2082 bond->params.downdelay * bond->params.miimon);
2083 }
2084 }
2085 /* no break ! fall through the BOND_LINK_FAIL test to
2086 ensure proper action to be taken
2087 */
2088 case BOND_LINK_FAIL: /* the link has just gone down */
2089 if (link_state != BMSR_LSTATUS) {
2090 /* link stays down */
2091 if (slave->delay <= 0) {
2092 /* link down for too long time */
2093 slave->link = BOND_LINK_DOWN;
2094
2095 /* in active/backup mode, we must
2096 * completely disable this interface
2097 */
2098 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2099 (bond->params.mode == BOND_MODE_8023AD)) {
2100 bond_set_slave_inactive_flags(slave);
2101 }
2102
2103 printk(KERN_INFO DRV_NAME
2104 ": %s: link status definitely "
2105 "down for interface %s, "
2106 "disabling it\n",
2107 bond_dev->name,
2108 slave_dev->name);
2109
2110 /* notify ad that the link status has changed */
2111 if (bond->params.mode == BOND_MODE_8023AD) {
2112 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2113 }
2114
2115 if ((bond->params.mode == BOND_MODE_TLB) ||
2116 (bond->params.mode == BOND_MODE_ALB)) {
2117 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2118 }
2119
2120 if (slave == oldcurrent) {
2121 do_failover = 1;
2122 }
2123 } else {
2124 slave->delay--;
2125 }
2126 } else {
2127 /* link up again */
2128 slave->link = BOND_LINK_UP;
2129 slave->jiffies = jiffies;
2130 printk(KERN_INFO DRV_NAME
2131 ": %s: link status up again after %d "
2132 "ms for interface %s.\n",
2133 bond_dev->name,
2134 (bond->params.downdelay - slave->delay) * bond->params.miimon,
2135 slave_dev->name);
2136 }
2137 break;
2138 case BOND_LINK_DOWN: /* the link was down */
2139 if (link_state != BMSR_LSTATUS) {
2140 /* the link stays down, nothing more to do */
2141 break;
2142 } else { /* link going up */
2143 slave->link = BOND_LINK_BACK;
2144 slave->delay = bond->params.updelay;
2145
2146 if (bond->params.updelay) {
2147 /* if updelay == 0, no need to
2148 advertise about a 0 ms delay */
2149 printk(KERN_INFO DRV_NAME
2150 ": %s: link status up for "
2151 "interface %s, enabling it "
2152 "in %d ms.\n",
2153 bond_dev->name,
2154 slave_dev->name,
2155 bond->params.updelay * bond->params.miimon);
2156 }
2157 }
2158 /* no break ! fall through the BOND_LINK_BACK state in
2159 case there's something to do.
2160 */
2161 case BOND_LINK_BACK: /* the link has just come back */
2162 if (link_state != BMSR_LSTATUS) {
2163 /* link down again */
2164 slave->link = BOND_LINK_DOWN;
2165
2166 printk(KERN_INFO DRV_NAME
2167 ": %s: link status down again after %d "
2168 "ms for interface %s.\n",
2169 bond_dev->name,
2170 (bond->params.updelay - slave->delay) * bond->params.miimon,
2171 slave_dev->name);
2172 } else {
2173 /* link stays up */
2174 if (slave->delay == 0) {
2175 /* now the link has been up for long time enough */
2176 slave->link = BOND_LINK_UP;
2177 slave->jiffies = jiffies;
2178
2179 if (bond->params.mode == BOND_MODE_8023AD) {
2180 /* prevent it from being the active one */
2181 slave->state = BOND_STATE_BACKUP;
2182 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2183 /* make it immediately active */
2184 slave->state = BOND_STATE_ACTIVE;
2185 } else if (slave != bond->primary_slave) {
2186 /* prevent it from being the active one */
2187 slave->state = BOND_STATE_BACKUP;
2188 }
2189
2190 printk(KERN_INFO DRV_NAME
2191 ": %s: link status definitely "
2192 "up for interface %s.\n",
2193 bond_dev->name,
2194 slave_dev->name);
2195
2196 /* notify ad that the link status has changed */
2197 if (bond->params.mode == BOND_MODE_8023AD) {
2198 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2199 }
2200
2201 if ((bond->params.mode == BOND_MODE_TLB) ||
2202 (bond->params.mode == BOND_MODE_ALB)) {
2203 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2204 }
2205
2206 if ((!oldcurrent) ||
2207 (slave == bond->primary_slave)) {
2208 do_failover = 1;
2209 }
2210 } else {
2211 slave->delay--;
2212 }
2213 }
2214 break;
2215 default:
2216 /* Should not happen */
4e0952c7
MW		 2217 printk(KERN_ERR DRV_NAME
2218 ": %s: Error: %s Illegal value (link=%d)\n",
2219 bond_dev->name,
2220 slave->dev->name,
2221 slave->link);
1da177e4
LT		 2222 goto out;
2223 } /* end of switch (slave->link) */
2224
2225 bond_update_speed_duplex(slave);
2226
2227 if (bond->params.mode == BOND_MODE_8023AD) {
2228 if (old_speed != slave->speed) {
2229 bond_3ad_adapter_speed_changed(slave);
2230 }
2231
2232 if (old_duplex != slave->duplex) {
2233 bond_3ad_adapter_duplex_changed(slave);
2234 }
2235 }
2236
2237 } /* end of for */
2238
2239 if (do_failover) {
2240 write_lock(&bond->curr_slave_lock);
2241
2242 bond_select_active_slave(bond);
2243
1da177e4 2244 write_unlock(&bond->curr_slave_lock);
ff59c456
JV		 2245 } else
2246 bond_set_carrier(bond);
1da177e4
LT		 2247
2248re_arm:
2249 if (bond->params.miimon) {
2250 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2251 }
2252out:
2253 read_unlock(&bond->lock);
2254}
2255
c3ade5ca
JV		 2256
2257static u32 bond_glean_dev_ip(struct net_device *dev)
2258{
2259 struct in_device *idev;
2260 struct in_ifaddr *ifa;
2261 u32 addr = 0;
2262
2263 if (!dev)
2264 return 0;
2265
2266 rcu_read_lock();
e5ed6399 2267 idev = __in_dev_get_rcu(dev);
c3ade5ca
JV		 2268 if (!idev)
2269 goto out;
2270
2271 ifa = idev->ifa_list;
2272 if (!ifa)
2273 goto out;
2274
2275 addr = ifa->ifa_local;
2276out:
2277 rcu_read_unlock();
2278 return addr;
2279}
2280
2281static int bond_has_ip(struct bonding *bond)
2282{
2283 struct vlan_entry *vlan, *vlan_next;
2284
2285 if (bond->master_ip)
2286 return 1;
2287
2288 if (list_empty(&bond->vlan_list))
2289 return 0;
2290
2291 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2292 vlan_list) {
2293 if (vlan->vlan_ip)
2294 return 1;
2295 }
2296
2297 return 0;
2298}
2299
2300/*
2301 * We go to the (large) trouble of VLAN tagging ARP frames because
2302 * switches in VLAN mode (especially if ports are configured as
2303 * "native" to a VLAN) might not pass non-tagged frames.
2304 */
2305static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2306{
2307 struct sk_buff *skb;
2308
2309 dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2310 slave_dev->name, dest_ip, src_ip, vlan_id);
2311
2312 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2313 NULL, slave_dev->dev_addr, NULL);
2314
2315 if (!skb) {
2316 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2317 return;
2318 }
2319 if (vlan_id) {
2320 skb = vlan_put_tag(skb, vlan_id);
2321 if (!skb) {
2322 printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2323 return;
2324 }
2325 }
2326 arp_xmit(skb);
2327}
2328
2329
1da177e4
LT		 2330static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2331{
c3ade5ca 2332 int i, vlan_id, rv;
1da177e4 2333 u32 *targets = bond->params.arp_targets;
c3ade5ca
JV		 2334 struct vlan_entry *vlan, *vlan_next;
2335 struct net_device *vlan_dev;
2336 struct flowi fl;
2337 struct rtable *rt;
1da177e4 2338
6b780567
MW		 2339 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2340 if (!targets[i])
2341 continue;
c3ade5ca
JV		 2342 dprintk("basa: target %x\n", targets[i]);
2343 if (list_empty(&bond->vlan_list)) {
2344 dprintk("basa: empty vlan: arp_send\n");
2345 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2346 bond->master_ip, 0);
2347 continue;
2348 }
2349
2350 /*
2351 * If VLANs are configured, we do a route lookup to
2352 * determine which VLAN interface would be used, so we
2353 * can tag the ARP with the proper VLAN tag.
2354 */
2355 memset(&fl, 0, sizeof(fl));
2356 fl.fl4_dst = targets[i];
2357 fl.fl4_tos = RTO_ONLINK;
2358
2359 rv = ip_route_output_key(&rt, &fl);
2360 if (rv) {
2361 if (net_ratelimit()) {
2362 printk(KERN_WARNING DRV_NAME
2363 ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2364 bond->dev->name, NIPQUAD(fl.fl4_dst));
2365 }
2366 continue;
2367 }
2368
2369 /*
2370 * This target is not on a VLAN
2371 */
2372 if (rt->u.dst.dev == bond->dev) {
ed4b9f80 2373 ip_rt_put(rt);
c3ade5ca
JV		 2374 dprintk("basa: rtdev == bond->dev: arp_send\n");
2375 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2376 bond->master_ip, 0);
2377 continue;
2378 }
2379
2380 vlan_id = 0;
2381 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2382 vlan_list) {
2383 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2384 if (vlan_dev == rt->u.dst.dev) {
2385 vlan_id = vlan->vlan_id;
2386 dprintk("basa: vlan match on %s %d\n",
2387 vlan_dev->name, vlan_id);
2388 break;
2389 }
2390 }
2391
2392 if (vlan_id) {
ed4b9f80 2393 ip_rt_put(rt);
c3ade5ca
JV		 2394 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2395 vlan->vlan_ip, vlan_id);
2396 continue;
2397 }
2398
2399 if (net_ratelimit()) {
2400 printk(KERN_WARNING DRV_NAME
2401 ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2402 bond->dev->name, NIPQUAD(fl.fl4_dst),
2403 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2404 }
ed4b9f80 2405 ip_rt_put(rt);
c3ade5ca
JV		 2406 }
2407}
2408
2409/*
2410 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2411 * for each VLAN above us.
2412 */
2413static void bond_send_gratuitous_arp(struct bonding *bond)
2414{
2415 struct slave *slave = bond->curr_active_slave;
2416 struct vlan_entry *vlan;
2417 struct net_device *vlan_dev;
2418
2419 dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2420 slave ? slave->dev->name : "NULL");
2421 if (!slave)
2422 return;
2423
2424 if (bond->master_ip) {
2425 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2426 bond->master_ip, 0);
2427 }
2428
2429 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2430 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2431 if (vlan->vlan_ip) {
2432 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2433 vlan->vlan_ip, vlan->vlan_id);
2434 }
1da177e4
LT		 2435 }
2436}
2437
2438/*
2439 * this function is called regularly to monitor each slave's link
2440 * ensuring that traffic is being sent and received when arp monitoring
2441 * is used in load-balancing mode. if the adapter has been dormant, then an
2442 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2443 * arp monitoring in active backup mode.
2444 */
a77b5325 2445void bond_loadbalance_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2446{
2447 struct bonding *bond = bond_dev->priv;
2448 struct slave *slave, *oldcurrent;
2449 int do_failover = 0;
2450 int delta_in_ticks;
2451 int i;
2452
2453 read_lock(&bond->lock);
2454
2455 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2456
2457 if (bond->kill_timers) {
2458 goto out;
2459 }
2460
2461 if (bond->slave_cnt == 0) {
2462 goto re_arm;
2463 }
2464
2465 read_lock(&bond->curr_slave_lock);
2466 oldcurrent = bond->curr_active_slave;
2467 read_unlock(&bond->curr_slave_lock);
2468
2469 /* see if any of the previous devices are up now (i.e. they have
2470 * xmt and rcv traffic). the curr_active_slave does not come into
2471 * the picture unless it is null. also, slave->jiffies is not needed
2472 * here because we send an arp on each slave and give a slave as
2473 * long as it needs to get the tx/rx within the delta.
2474 * TODO: what about up/down delay in arp mode? it wasn't here before
2475 * so it can wait
2476 */
2477 bond_for_each_slave(bond, slave, i) {
2478 if (slave->link != BOND_LINK_UP) {
2479 if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2480 ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2481
2482 slave->link = BOND_LINK_UP;
2483 slave->state = BOND_STATE_ACTIVE;
2484
2485 /* primary_slave has no meaning in round-robin
2486 * mode. the window of a slave being up and
2487 * curr_active_slave being null after enslaving
2488 * is closed.
2489 */
2490 if (!oldcurrent) {
2491 printk(KERN_INFO DRV_NAME
2492 ": %s: link status definitely "
2493 "up for interface %s, ",
2494 bond_dev->name,
2495 slave->dev->name);
2496 do_failover = 1;
2497 } else {
2498 printk(KERN_INFO DRV_NAME
2499 ": %s: interface %s is now up\n",
2500 bond_dev->name,
2501 slave->dev->name);
2502 }
2503 }
2504 } else {
2505 /* slave->link == BOND_LINK_UP */
2506
2507 /* not all switches will respond to an arp request
2508 * when the source ip is 0, so don't take the link down
2509 * if we don't know our ip yet
2510 */
2511 if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2512 (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
c3ade5ca 2513 bond_has_ip(bond))) {
1da177e4
LT		 2514
2515 slave->link = BOND_LINK_DOWN;
2516 slave->state = BOND_STATE_BACKUP;
2517
2518 if (slave->link_failure_count < UINT_MAX) {
2519 slave->link_failure_count++;
2520 }
2521
2522 printk(KERN_INFO DRV_NAME
2523 ": %s: interface %s is now down.\n",
2524 bond_dev->name,
2525 slave->dev->name);
2526
2527 if (slave == oldcurrent) {
2528 do_failover = 1;
2529 }
2530 }
2531 }
2532
2533 /* note: if switch is in round-robin mode, all links
2534 * must tx arp to ensure all links rx an arp - otherwise
2535 * links may oscillate or not come up at all; if switch is
2536 * in something like xor mode, there is nothing we can
2537 * do - all replies will be rx'ed on same link causing slaves
2538 * to be unstable during low/no traffic periods
2539 */
2540 if (IS_UP(slave->dev)) {
2541 bond_arp_send_all(bond, slave);
2542 }
2543 }
2544
2545 if (do_failover) {
2546 write_lock(&bond->curr_slave_lock);
2547
2548 bond_select_active_slave(bond);
2549
1da177e4
LT		 2550 write_unlock(&bond->curr_slave_lock);
2551 }
2552
2553re_arm:
2554 if (bond->params.arp_interval) {
2555 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2556 }
2557out:
2558 read_unlock(&bond->lock);
2559}
2560
2561/*
2562 * When using arp monitoring in active-backup mode, this function is
2563 * called to determine if any backup slaves have went down or a new
2564 * current slave needs to be found.
2565 * The backup slaves never generate traffic, they are considered up by merely
2566 * receiving traffic. If the current slave goes down, each backup slave will
2567 * be given the opportunity to tx/rx an arp before being taken down - this
2568 * prevents all slaves from being taken down due to the current slave not
2569 * sending any traffic for the backups to receive. The arps are not necessarily
2570 * necessary, any tx and rx traffic will keep the current slave up. While any
2571 * rx traffic will keep the backup slaves up, the current slave is responsible
2572 * for generating traffic to keep them up regardless of any other traffic they
2573 * may have received.
2574 * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2575 */
a77b5325 2576void bond_activebackup_arp_mon(struct net_device *bond_dev)
1da177e4
LT		 2577{
2578 struct bonding *bond = bond_dev->priv;
2579 struct slave *slave;
2580 int delta_in_ticks;
2581 int i;
2582
2583 read_lock(&bond->lock);
2584
2585 delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2586
2587 if (bond->kill_timers) {
2588 goto out;
2589 }
2590
2591 if (bond->slave_cnt == 0) {
2592 goto re_arm;
2593 }
2594
2595 /* determine if any slave has come up or any backup slave has
2596 * gone down
2597 * TODO: what about up/down delay in arp mode? it wasn't here before
2598 * so it can wait
2599 */
2600 bond_for_each_slave(bond, slave, i) {
2601 if (slave->link != BOND_LINK_UP) {
2602 if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) {
2603
2604 slave->link = BOND_LINK_UP;
2605
2606 write_lock(&bond->curr_slave_lock);
2607
2608 if ((!bond->curr_active_slave) &&
2609 ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2610 bond_change_active_slave(bond, slave);
2611 bond->current_arp_slave = NULL;
2612 } else if (bond->curr_active_slave != slave) {
2613 /* this slave has just come up but we
2614 * already have a current slave; this
2615 * can also happen if bond_enslave adds
2616 * a new slave that is up while we are
2617 * searching for a new slave
2618 */
2619 bond_set_slave_inactive_flags(slave);
2620 bond->current_arp_slave = NULL;
2621 }
2622
ff59c456
JV		 2623 bond_set_carrier(bond);
2624
1da177e4
LT		 2625 if (slave == bond->curr_active_slave) {
2626 printk(KERN_INFO DRV_NAME
2627 ": %s: %s is up and now the "
2628 "active interface\n",
2629 bond_dev->name,
2630 slave->dev->name);
ff59c456 2631 netif_carrier_on(bond->dev);
1da177e4
LT		 2632 } else {
2633 printk(KERN_INFO DRV_NAME
2634 ": %s: backup interface %s is "
2635 "now up\n",
2636 bond_dev->name,
2637 slave->dev->name);
2638 }
2639
2640 write_unlock(&bond->curr_slave_lock);
2641 }
2642 } else {
2643 read_lock(&bond->curr_slave_lock);
2644
2645 if ((slave != bond->curr_active_slave) &&
2646 (!bond->current_arp_slave) &&
2647 (((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) &&
c3ade5ca 2648 bond_has_ip(bond))) {
1da177e4
LT		 2649 /* a backup slave has gone down; three times
2650 * the delta allows the current slave to be
2651 * taken out before the backup slave.
2652 * note: a non-null current_arp_slave indicates
2653 * the curr_active_slave went down and we are
2654 * searching for a new one; under this
2655 * condition we only take the curr_active_slave
2656 * down - this gives each slave a chance to
2657 * tx/rx traffic before being taken out
2658 */
2659
2660 read_unlock(&bond->curr_slave_lock);
2661
2662 slave->link = BOND_LINK_DOWN;
2663
2664 if (slave->link_failure_count < UINT_MAX) {
2665 slave->link_failure_count++;
2666 }
2667
2668 bond_set_slave_inactive_flags(slave);
2669
2670 printk(KERN_INFO DRV_NAME
2671 ": %s: backup interface %s is now down\n",
2672 bond_dev->name,
2673 slave->dev->name);
2674 } else {
2675 read_unlock(&bond->curr_slave_lock);
2676 }
2677 }
2678 }
2679
2680 read_lock(&bond->curr_slave_lock);
2681 slave = bond->curr_active_slave;
2682 read_unlock(&bond->curr_slave_lock);
2683
2684 if (slave) {
2685 /* if we have sent traffic in the past 2*arp_intervals but
2686 * haven't xmit and rx traffic in that time interval, select
2687 * a different slave. slave->jiffies is only updated when
2688 * a slave first becomes the curr_active_slave - not necessarily
2689 * after every arp; this ensures the slave has a full 2*delta
2690 * before being taken out. if a primary is being used, check
2691 * if it is up and needs to take over as the curr_active_slave
2692 */
2693 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
c3ade5ca
JV		 2694 (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2695 bond_has_ip(bond))) &&
1da177e4
LT		 2696 ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2697
2698 slave->link = BOND_LINK_DOWN;
2699
2700 if (slave->link_failure_count < UINT_MAX) {
2701 slave->link_failure_count++;
2702 }
2703
2704 printk(KERN_INFO DRV_NAME
2705 ": %s: link status down for active interface "
2706 "%s, disabling it\n",
2707 bond_dev->name,
2708 slave->dev->name);
2709
2710 write_lock(&bond->curr_slave_lock);
2711
2712 bond_select_active_slave(bond);
2713 slave = bond->curr_active_slave;
2714
2715 write_unlock(&bond->curr_slave_lock);
2716
2717 bond->current_arp_slave = slave;
2718
2719 if (slave) {
2720 slave->jiffies = jiffies;
2721 }
2722 } else if ((bond->primary_slave) &&
2723 (bond->primary_slave != slave) &&
2724 (bond->primary_slave->link == BOND_LINK_UP)) {
2725 /* at this point, slave is the curr_active_slave */
2726 printk(KERN_INFO DRV_NAME
2727 ": %s: changing from interface %s to primary "
2728 "interface %s\n",
2729 bond_dev->name,
2730 slave->dev->name,
2731 bond->primary_slave->dev->name);
2732
2733 /* primary is up so switch to it */
2734 write_lock(&bond->curr_slave_lock);
2735 bond_change_active_slave(bond, bond->primary_slave);
2736 write_unlock(&bond->curr_slave_lock);
2737
2738 slave = bond->primary_slave;
2739 slave->jiffies = jiffies;
2740 } else {
2741 bond->current_arp_slave = NULL;
2742 }
2743
2744 /* the current slave must tx an arp to ensure backup slaves
2745 * rx traffic
2746 */
c3ade5ca 2747 if (slave && bond_has_ip(bond)) {
1da177e4
LT		 2748 bond_arp_send_all(bond, slave);
2749 }
2750 }
2751
2752 /* if we don't have a curr_active_slave, search for the next available
2753 * backup slave from the current_arp_slave and make it the candidate
2754 * for becoming the curr_active_slave
2755 */
2756 if (!slave) {
2757 if (!bond->current_arp_slave) {
2758 bond->current_arp_slave = bond->first_slave;
2759 }
2760
2761 if (bond->current_arp_slave) {
2762 bond_set_slave_inactive_flags(bond->current_arp_slave);
2763
2764 /* search for next candidate */
2f872f04 2765 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
1da177e4
LT		 2766 if (IS_UP(slave->dev)) {
2767 slave->link = BOND_LINK_BACK;
2768 bond_set_slave_active_flags(slave);
2769 bond_arp_send_all(bond, slave);
2770 slave->jiffies = jiffies;
2771 bond->current_arp_slave = slave;
2772 break;
2773 }
2774
2775 /* if the link state is up at this point, we
2776 * mark it down - this can happen if we have
2777 * simultaneous link failures and
2778 * reselect_active_interface doesn't make this
2779 * one the current slave so it is still marked
2780 * up when it is actually down
2781 */
2782 if (slave->link == BOND_LINK_UP) {
2783 slave->link = BOND_LINK_DOWN;
2784 if (slave->link_failure_count < UINT_MAX) {
2785 slave->link_failure_count++;
2786 }
2787
2788 bond_set_slave_inactive_flags(slave);
2789
2790 printk(KERN_INFO DRV_NAME
2791 ": %s: backup interface %s is "
2792 "now down.\n",
2793 bond_dev->name,
2794 slave->dev->name);
2795 }
2796 }
2797 }
2798 }
2799
2800re_arm:
2801 if (bond->params.arp_interval) {
2802 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2803 }
2804out:
2805 read_unlock(&bond->lock);
2806}
2807
2808/*------------------------------ proc/seq_file-------------------------------*/
2809
2810#ifdef CONFIG_PROC_FS
2811
2812#define SEQ_START_TOKEN ((void *)1)
2813
2814static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2815{
2816 struct bonding *bond = seq->private;
2817 loff_t off = 0;
2818 struct slave *slave;
2819 int i;
2820
2821 /* make sure the bond won't be taken away */
2822 read_lock(&dev_base_lock);
2823 read_lock_bh(&bond->lock);
2824
2825 if (*pos == 0) {
2826 return SEQ_START_TOKEN;
2827 }
2828
2829 bond_for_each_slave(bond, slave, i) {
2830 if (++off == *pos) {
2831 return slave;
2832 }
2833 }
2834
2835 return NULL;
2836}
2837
2838static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2839{
2840 struct bonding *bond = seq->private;
2841 struct slave *slave = v;
2842
2843 ++*pos;
2844 if (v == SEQ_START_TOKEN) {
2845 return bond->first_slave;
2846 }
2847
2848 slave = slave->next;
2849
2850 return (slave == bond->first_slave) ? NULL : slave;
2851}
2852
2853static void bond_info_seq_stop(struct seq_file *seq, void *v)
2854{
2855 struct bonding *bond = seq->private;
2856
2857 read_unlock_bh(&bond->lock);
2858 read_unlock(&dev_base_lock);
2859}
2860
2861static void bond_info_show_master(struct seq_file *seq)
2862{
2863 struct bonding *bond = seq->private;
2864 struct slave *curr;
4756b02f
MW		 2865 int i;
2866 u32 target;
1da177e4
LT		 2867
2868 read_lock(&bond->curr_slave_lock);
2869 curr = bond->curr_active_slave;
2870 read_unlock(&bond->curr_slave_lock);
2871
2872 seq_printf(seq, "Bonding Mode: %s\n",
2873 bond_mode_name(bond->params.mode));
2874
c61b75ad
MW		 2875 if (bond->params.mode == BOND_MODE_XOR ||
2876 bond->params.mode == BOND_MODE_8023AD) {
2877 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2878 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2879 bond->params.xmit_policy);
2880 }
2881
1da177e4
LT		 2882 if (USES_PRIMARY(bond->params.mode)) {
2883 seq_printf(seq, "Primary Slave: %s\n",
0f418b2a
MW		 2884 (bond->primary_slave) ?
2885 bond->primary_slave->dev->name : "None");
1da177e4
LT		 2886
2887 seq_printf(seq, "Currently Active Slave: %s\n",
2888 (curr) ? curr->dev->name : "None");
2889 }
2890
ff59c456
JV		 2891 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2892 "up" : "down");
1da177e4
LT		 2893 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2894 seq_printf(seq, "Up Delay (ms): %d\n",
2895 bond->params.updelay * bond->params.miimon);
2896 seq_printf(seq, "Down Delay (ms): %d\n",
2897 bond->params.downdelay * bond->params.miimon);
2898
4756b02f
MW		 2899
2900 /* ARP information */
2901 if(bond->params.arp_interval > 0) {
2902 int printed=0;
2903 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2904 bond->params.arp_interval);
2905
2906 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2907
2908 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2909 if (!bond->params.arp_targets[i])
2910 continue;
2911 if (printed)
2912 seq_printf(seq, ",");
2913 target = ntohl(bond->params.arp_targets[i]);
2914 seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
2915 printed = 1;
2916 }
2917 seq_printf(seq, "\n");
2918 }
2919
1da177e4
LT		 2920 if (bond->params.mode == BOND_MODE_8023AD) {
2921 struct ad_info ad_info;
2922
2923 seq_puts(seq, "\n802.3ad info\n");
2924 seq_printf(seq, "LACP rate: %s\n",
2925 (bond->params.lacp_fast) ? "fast" : "slow");
2926
2927 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2928 seq_printf(seq, "bond %s has no active aggregator\n",
2929 bond->dev->name);
2930 } else {
2931 seq_printf(seq, "Active Aggregator Info:\n");
2932
2933 seq_printf(seq, "\tAggregator ID: %d\n",
2934 ad_info.aggregator_id);
2935 seq_printf(seq, "\tNumber of ports: %d\n",
2936 ad_info.ports);
2937 seq_printf(seq, "\tActor Key: %d\n",
2938 ad_info.actor_key);
2939 seq_printf(seq, "\tPartner Key: %d\n",
2940 ad_info.partner_key);
2941 seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
2942 ad_info.partner_system[0],
2943 ad_info.partner_system[1],
2944 ad_info.partner_system[2],
2945 ad_info.partner_system[3],
2946 ad_info.partner_system[4],
2947 ad_info.partner_system[5]);
2948 }
2949 }
2950}
2951
2952static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
2953{
2954 struct bonding *bond = seq->private;
2955
2956 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
2957 seq_printf(seq, "MII Status: %s\n",
2958 (slave->link == BOND_LINK_UP) ? "up" : "down");
65509645 2959 seq_printf(seq, "Link Failure Count: %u\n",
1da177e4
LT		 2960 slave->link_failure_count);
2961
217df670
JV		 2962 seq_printf(seq,
2963 "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
2964 slave->perm_hwaddr[0], slave->perm_hwaddr[1],
2965 slave->perm_hwaddr[2], slave->perm_hwaddr[3],
2966 slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
1da177e4
LT		 2967
2968 if (bond->params.mode == BOND_MODE_8023AD) {
2969 const struct aggregator *agg
2970 = SLAVE_AD_INFO(slave).port.aggregator;
2971
2972 if (agg) {
2973 seq_printf(seq, "Aggregator ID: %d\n",
2974 agg->aggregator_identifier);
2975 } else {
2976 seq_puts(seq, "Aggregator ID: N/A\n");
2977 }
2978 }
2979}
2980
2981static int bond_info_seq_show(struct seq_file *seq, void *v)
2982{
2983 if (v == SEQ_START_TOKEN) {
2984 seq_printf(seq, "%s\n", version);
2985 bond_info_show_master(seq);
2986 } else {
2987 bond_info_show_slave(seq, v);
2988 }
2989
2990 return 0;
2991}
2992
2993static struct seq_operations bond_info_seq_ops = {
2994 .start = bond_info_seq_start,
2995 .next = bond_info_seq_next,
2996 .stop = bond_info_seq_stop,
2997 .show = bond_info_seq_show,
2998};
2999
3000static int bond_info_open(struct inode *inode, struct file *file)
3001{
3002 struct seq_file *seq;
3003 struct proc_dir_entry *proc;
3004 int res;
3005
3006 res = seq_open(file, &bond_info_seq_ops);
3007 if (!res) {
3008 /* recover the pointer buried in proc_dir_entry data */
3009 seq = file->private_data;
3010 proc = PDE(inode);
3011 seq->private = proc->data;
3012 }
3013
3014 return res;
3015}
3016
3017static struct file_operations bond_info_fops = {
3018 .owner = THIS_MODULE,
3019 .open = bond_info_open,
3020 .read = seq_read,
3021 .llseek = seq_lseek,
3022 .release = seq_release,
3023};
3024
3025static int bond_create_proc_entry(struct bonding *bond)
3026{
3027 struct net_device *bond_dev = bond->dev;
3028
3029 if (bond_proc_dir) {
3030 bond->proc_entry = create_proc_entry(bond_dev->name,
3031 S_IRUGO,
3032 bond_proc_dir);
3033 if (bond->proc_entry == NULL) {
3034 printk(KERN_WARNING DRV_NAME
3035 ": Warning: Cannot create /proc/net/%s/%s\n",
3036 DRV_NAME, bond_dev->name);
3037 } else {
3038 bond->proc_entry->data = bond;
3039 bond->proc_entry->proc_fops = &bond_info_fops;
3040 bond->proc_entry->owner = THIS_MODULE;
3041 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3042 }
3043 }
3044
3045 return 0;
3046}
3047
3048static void bond_remove_proc_entry(struct bonding *bond)
3049{
3050 if (bond_proc_dir && bond->proc_entry) {
3051 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3052 memset(bond->proc_file_name, 0, IFNAMSIZ);
3053 bond->proc_entry = NULL;
3054 }
3055}
3056
3057/* Create the bonding directory under /proc/net, if doesn't exist yet.
3058 * Caller must hold rtnl_lock.
3059 */
3060static void bond_create_proc_dir(void)
3061{
3062 int len = strlen(DRV_NAME);
3063
3064 for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
3065 bond_proc_dir = bond_proc_dir->next) {
3066 if ((bond_proc_dir->namelen == len) &&
3067 !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3068 break;
3069 }
3070 }
3071
3072 if (!bond_proc_dir) {
3073 bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
3074 if (bond_proc_dir) {
3075 bond_proc_dir->owner = THIS_MODULE;
3076 } else {
3077 printk(KERN_WARNING DRV_NAME
3078 ": Warning: cannot create /proc/net/%s\n",
3079 DRV_NAME);
3080 }
3081 }
3082}
3083
3084/* Destroy the bonding directory under /proc/net, if empty.
3085 * Caller must hold rtnl_lock.
3086 */
3087static void bond_destroy_proc_dir(void)
3088{
3089 struct proc_dir_entry *de;
3090
3091 if (!bond_proc_dir) {
3092 return;
3093 }
3094
3095 /* verify that the /proc dir is empty */
3096 for (de = bond_proc_dir->subdir; de; de = de->next) {
3097 /* ignore . and .. */
3098 if (*(de->name) != '.') {
3099 break;
3100 }
3101 }
3102
3103 if (de) {
3104 if (bond_proc_dir->owner == THIS_MODULE) {
3105 bond_proc_dir->owner = NULL;
3106 }
3107 } else {
3108 remove_proc_entry(DRV_NAME, proc_net);
3109 bond_proc_dir = NULL;
3110 }
3111}
3112#endif /* CONFIG_PROC_FS */
3113
3114/*-------------------------- netdev event handling --------------------------*/
3115
3116/*
3117 * Change device name
3118 */
3119static int bond_event_changename(struct bonding *bond)
3120{
3121#ifdef CONFIG_PROC_FS
3122 bond_remove_proc_entry(bond);
3123 bond_create_proc_entry(bond);
3124#endif
b76cdba9
MW		 3125 down_write(&(bonding_rwsem));
3126 bond_destroy_sysfs_entry(bond);
3127 bond_create_sysfs_entry(bond);
3128 up_write(&(bonding_rwsem));
1da177e4
LT		 3129 return NOTIFY_DONE;
3130}
3131
3132static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3133{
3134 struct bonding *event_bond = bond_dev->priv;
3135
3136 switch (event) {
3137 case NETDEV_CHANGENAME:
3138 return bond_event_changename(event_bond);
3139 case NETDEV_UNREGISTER:
3140 /*
3141 * TODO: remove a bond from the list?
3142 */
3143 break;
3144 default:
3145 break;
3146 }
3147
3148 return NOTIFY_DONE;
3149}
3150
3151static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3152{
3153 struct net_device *bond_dev = slave_dev->master;
8531c5ff 3154 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3155
3156 switch (event) {
3157 case NETDEV_UNREGISTER:
3158 if (bond_dev) {
3159 bond_release(bond_dev, slave_dev);
3160 }
3161 break;
3162 case NETDEV_CHANGE:
3163 /*
3164 * TODO: is this what we get if somebody
3165 * sets up a hierarchical bond, then rmmod's
3166 * one of the slave bonding devices?
3167 */
3168 break;
3169 case NETDEV_DOWN:
3170 /*
3171 * ... Or is it this?
3172 */
3173 break;
3174 case NETDEV_CHANGEMTU:
3175 /*
3176 * TODO: Should slaves be allowed to
3177 * independently alter their MTU? For
3178 * an active-backup bond, slaves need
3179 * not be the same type of device, so
3180 * MTUs may vary. For other modes,
3181 * slaves arguably should have the
3182 * same MTUs. To do this, we'd need to
3183 * take over the slave's change_mtu
3184 * function for the duration of their
3185 * servitude.
3186 */
3187 break;
3188 case NETDEV_CHANGENAME:
3189 /*
3190 * TODO: handle changing the primary's name
3191 */
3192 break;
8531c5ff
AK		 3193 case NETDEV_FEAT_CHANGE:
3194 bond_compute_features(bond);
3195 break;
1da177e4
LT		 3196 default:
3197 break;
3198 }
3199
3200 return NOTIFY_DONE;
3201}
3202
3203/*
3204 * bond_netdev_event: handle netdev notifier chain events.
3205 *
3206 * This function receives events for the netdev chain. The caller (an
e041c683 3207 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
1da177e4
LT		 3208 * locks for us to safely manipulate the slave devices (RTNL lock,
3209 * dev_probe_lock).
3210 */
3211static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3212{
3213 struct net_device *event_dev = (struct net_device *)ptr;
3214
3215 dprintk("event_dev: %s, event: %lx\n",
3216 (event_dev ? event_dev->name : "None"),
3217 event);
3218
3219 if (event_dev->flags & IFF_MASTER) {
3220 dprintk("IFF_MASTER\n");
3221 return bond_master_netdev_event(event, event_dev);
3222 }
3223
3224 if (event_dev->flags & IFF_SLAVE) {
3225 dprintk("IFF_SLAVE\n");
3226 return bond_slave_netdev_event(event, event_dev);
3227 }
3228
3229 return NOTIFY_DONE;
3230}
3231
c3ade5ca
JV		 3232/*
3233 * bond_inetaddr_event: handle inetaddr notifier chain events.
3234 *
3235 * We keep track of device IPs primarily to use as source addresses in
3236 * ARP monitor probes (rather than spewing out broadcasts all the time).
3237 *
3238 * We track one IP for the main device (if it has one), plus one per VLAN.
3239 */
3240static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3241{
3242 struct in_ifaddr *ifa = ptr;
3243 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3244 struct bonding *bond, *bond_next;
3245 struct vlan_entry *vlan, *vlan_next;
3246
3247 list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3248 if (bond->dev == event_dev) {
3249 switch (event) {
3250 case NETDEV_UP:
3251 bond->master_ip = ifa->ifa_local;
3252 return NOTIFY_OK;
3253 case NETDEV_DOWN:
3254 bond->master_ip = bond_glean_dev_ip(bond->dev);
3255 return NOTIFY_OK;
3256 default:
3257 return NOTIFY_DONE;
3258 }
3259 }
3260
3261 if (list_empty(&bond->vlan_list))
3262 continue;
3263
3264 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3265 vlan_list) {
3266 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
3267 if (vlan_dev == event_dev) {
3268 switch (event) {
3269 case NETDEV_UP:
3270 vlan->vlan_ip = ifa->ifa_local;
3271 return NOTIFY_OK;
3272 case NETDEV_DOWN:
3273 vlan->vlan_ip =
3274 bond_glean_dev_ip(vlan_dev);
3275 return NOTIFY_OK;
3276 default:
3277 return NOTIFY_DONE;
3278 }
3279 }
3280 }
3281 }
3282 return NOTIFY_DONE;
3283}
3284
1da177e4
LT		 3285static struct notifier_block bond_netdev_notifier = {
3286 .notifier_call = bond_netdev_event,
3287};
3288
c3ade5ca
JV		 3289static struct notifier_block bond_inetaddr_notifier = {
3290 .notifier_call = bond_inetaddr_event,
3291};
3292
1da177e4
LT		 3293/*-------------------------- Packet type handling ---------------------------*/
3294
3295/* register to receive lacpdus on a bond */
3296static void bond_register_lacpdu(struct bonding *bond)
3297{
3298 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3299
3300 /* initialize packet type */
3301 pk_type->type = PKT_TYPE_LACPDU;
3302 pk_type->dev = bond->dev;
3303 pk_type->func = bond_3ad_lacpdu_recv;
3304
3305 dev_add_pack(pk_type);
3306}
3307
3308/* unregister to receive lacpdus on a bond */
3309static void bond_unregister_lacpdu(struct bonding *bond)
3310{
3311 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3312}
3313
169a3e66
JV		 3314/*---------------------------- Hashing Policies -----------------------------*/
3315
3316/*
3317 * Hash for the the output device based upon layer 3 and layer 4 data. If
3318 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3319 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3320 */
3321static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3322 struct net_device *bond_dev, int count)
3323{
3324 struct ethhdr *data = (struct ethhdr *)skb->data;
3325 struct iphdr *iph = skb->nh.iph;
3326 u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3327 int layer4_xor = 0;
3328
3329 if (skb->protocol == __constant_htons(ETH_P_IP)) {
3330 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3331 (iph->protocol == IPPROTO_TCP ||
3332 iph->protocol == IPPROTO_UDP)) {
3333 layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3334 }
3335 return (layer4_xor ^
3336 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3337
3338 }
3339
3340 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3341}
3342
3343/*
3344 * Hash for the output device based upon layer 2 data
3345 */
3346static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3347 struct net_device *bond_dev, int count)
3348{
3349 struct ethhdr *data = (struct ethhdr *)skb->data;
3350
3351 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3352}
3353
1da177e4
LT		 3354/*-------------------------- Device entry points ----------------------------*/
3355
3356static int bond_open(struct net_device *bond_dev)
3357{
3358 struct bonding *bond = bond_dev->priv;
3359 struct timer_list *mii_timer = &bond->mii_timer;
3360 struct timer_list *arp_timer = &bond->arp_timer;
3361
3362 bond->kill_timers = 0;
3363
3364 if ((bond->params.mode == BOND_MODE_TLB) ||
3365 (bond->params.mode == BOND_MODE_ALB)) {
3366 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3367
3368 /* bond_alb_initialize must be called before the timer
3369 * is started.
3370 */
3371 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3372 /* something went wrong - fail the open operation */
3373 return -1;
3374 }
3375
3376 init_timer(alb_timer);
3377 alb_timer->expires = jiffies + 1;
3378 alb_timer->data = (unsigned long)bond;
3379 alb_timer->function = (void *)&bond_alb_monitor;
3380 add_timer(alb_timer);
3381 }
3382
3383 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3384 init_timer(mii_timer);
3385 mii_timer->expires = jiffies + 1;
3386 mii_timer->data = (unsigned long)bond_dev;
3387 mii_timer->function = (void *)&bond_mii_monitor;
3388 add_timer(mii_timer);
3389 }
3390
3391 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3392 init_timer(arp_timer);
3393 arp_timer->expires = jiffies + 1;
3394 arp_timer->data = (unsigned long)bond_dev;
3395 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3396 arp_timer->function = (void *)&bond_activebackup_arp_mon;
3397 } else {
3398 arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3399 }
3400 add_timer(arp_timer);
3401 }
3402
3403 if (bond->params.mode == BOND_MODE_8023AD) {
3404 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3405 init_timer(ad_timer);
3406 ad_timer->expires = jiffies + 1;
3407 ad_timer->data = (unsigned long)bond;
3408 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3409 add_timer(ad_timer);
3410
3411 /* register to receive LACPDUs */
3412 bond_register_lacpdu(bond);
3413 }
3414
3415 return 0;
3416}
3417
3418static int bond_close(struct net_device *bond_dev)
3419{
3420 struct bonding *bond = bond_dev->priv;
3421
3422 if (bond->params.mode == BOND_MODE_8023AD) {
3423 /* Unregister the receive of LACPDUs */
3424 bond_unregister_lacpdu(bond);
3425 }
3426
3427 write_lock_bh(&bond->lock);
3428
3429 bond_mc_list_destroy(bond);
3430
3431 /* signal timers not to re-arm */
3432 bond->kill_timers = 1;
3433
3434 write_unlock_bh(&bond->lock);
3435
3436 /* del_timer_sync must run without holding the bond->lock
3437 * because a running timer might be trying to hold it too
3438 */
3439
3440 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3441 del_timer_sync(&bond->mii_timer);
3442 }
3443
3444 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3445 del_timer_sync(&bond->arp_timer);
3446 }
3447
3448 switch (bond->params.mode) {
3449 case BOND_MODE_8023AD:
3450 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3451 break;
3452 case BOND_MODE_TLB:
3453 case BOND_MODE_ALB:
3454 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3455 break;
3456 default:
3457 break;
3458 }
3459
3460 /* Release the bonded slaves */
3461 bond_release_all(bond_dev);
3462
3463 if ((bond->params.mode == BOND_MODE_TLB) ||
3464 (bond->params.mode == BOND_MODE_ALB)) {
3465 /* Must be called only after all
3466 * slaves have been released
3467 */
3468 bond_alb_deinitialize(bond);
3469 }
3470
3471 return 0;
3472}
3473
3474static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3475{
3476 struct bonding *bond = bond_dev->priv;
3477 struct net_device_stats *stats = &(bond->stats), *sstats;
3478 struct slave *slave;
3479 int i;
3480
3481 memset(stats, 0, sizeof(struct net_device_stats));
3482
3483 read_lock_bh(&bond->lock);
3484
3485 bond_for_each_slave(bond, slave, i) {
3486 sstats = slave->dev->get_stats(slave->dev);
3487
3488 stats->rx_packets += sstats->rx_packets;
3489 stats->rx_bytes += sstats->rx_bytes;
3490 stats->rx_errors += sstats->rx_errors;
3491 stats->rx_dropped += sstats->rx_dropped;
3492
3493 stats->tx_packets += sstats->tx_packets;
3494 stats->tx_bytes += sstats->tx_bytes;
3495 stats->tx_errors += sstats->tx_errors;
3496 stats->tx_dropped += sstats->tx_dropped;
3497
3498 stats->multicast += sstats->multicast;
3499 stats->collisions += sstats->collisions;
3500
3501 stats->rx_length_errors += sstats->rx_length_errors;
3502 stats->rx_over_errors += sstats->rx_over_errors;
3503 stats->rx_crc_errors += sstats->rx_crc_errors;
3504 stats->rx_frame_errors += sstats->rx_frame_errors;
3505 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3506 stats->rx_missed_errors += sstats->rx_missed_errors;
3507
3508 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3509 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3510 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3511 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3512 stats->tx_window_errors += sstats->tx_window_errors;
3513 }
3514
3515 read_unlock_bh(&bond->lock);
3516
3517 return stats;
3518}
3519
3520static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3521{
3522 struct net_device *slave_dev = NULL;
3523 struct ifbond k_binfo;
3524 struct ifbond __user *u_binfo = NULL;
3525 struct ifslave k_sinfo;
3526 struct ifslave __user *u_sinfo = NULL;
3527 struct mii_ioctl_data *mii = NULL;
1da177e4
LT		 3528 int res = 0;
3529
3530 dprintk("bond_ioctl: master=%s, cmd=%d\n",
3531 bond_dev->name, cmd);
3532
3533 switch (cmd) {
1da177e4
LT		 3534 case SIOCGMIIPHY:
3535 mii = if_mii(ifr);
3536 if (!mii) {
3537 return -EINVAL;
3538 }
3539 mii->phy_id = 0;
3540 /* Fall Through */
3541 case SIOCGMIIREG:
3542 /*
3543 * We do this again just in case we were called by SIOCGMIIREG
3544 * instead of SIOCGMIIPHY.
3545 */
3546 mii = if_mii(ifr);
3547 if (!mii) {
3548 return -EINVAL;
3549 }
3550
3551 if (mii->reg_num == 1) {
3552 struct bonding *bond = bond_dev->priv;
3553 mii->val_out = 0;
3554 read_lock_bh(&bond->lock);
3555 read_lock(&bond->curr_slave_lock);
3556 if (bond->curr_active_slave) {
3557 mii->val_out = BMSR_LSTATUS;
3558 }
3559 read_unlock(&bond->curr_slave_lock);
3560 read_unlock_bh(&bond->lock);
3561 }
3562
3563 return 0;
3564 case BOND_INFO_QUERY_OLD:
3565 case SIOCBONDINFOQUERY:
3566 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3567
3568 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3569 return -EFAULT;
3570 }
3571
3572 res = bond_info_query(bond_dev, &k_binfo);
3573 if (res == 0) {
3574 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3575 return -EFAULT;
3576 }
3577 }
3578
3579 return res;
3580 case BOND_SLAVE_INFO_QUERY_OLD:
3581 case SIOCBONDSLAVEINFOQUERY:
3582 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3583
3584 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3585 return -EFAULT;
3586 }
3587
3588 res = bond_slave_info_query(bond_dev, &k_sinfo);
3589 if (res == 0) {
3590 if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3591 return -EFAULT;
3592 }
3593 }
3594
3595 return res;
3596 default:
3597 /* Go on */
3598 break;
3599 }
3600
3601 if (!capable(CAP_NET_ADMIN)) {
3602 return -EPERM;
3603 }
3604
b76cdba9 3605 down_write(&(bonding_rwsem));
1da177e4
LT		 3606 slave_dev = dev_get_by_name(ifr->ifr_slave);
3607
3608 dprintk("slave_dev=%p: \n", slave_dev);
3609
3610 if (!slave_dev) {
3611 res = -ENODEV;
3612 } else {
3613 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3614 switch (cmd) {
3615 case BOND_ENSLAVE_OLD:
3616 case SIOCBONDENSLAVE:
3617 res = bond_enslave(bond_dev, slave_dev);
3618 break;
3619 case BOND_RELEASE_OLD:
3620 case SIOCBONDRELEASE:
3621 res = bond_release(bond_dev, slave_dev);
3622 break;
3623 case BOND_SETHWADDR_OLD:
3624 case SIOCBONDSETHWADDR:
3625 res = bond_sethwaddr(bond_dev, slave_dev);
3626 break;
3627 case BOND_CHANGE_ACTIVE_OLD:
3628 case SIOCBONDCHANGEACTIVE:
3629 res = bond_ioctl_change_active(bond_dev, slave_dev);
3630 break;
3631 default:
3632 res = -EOPNOTSUPP;
3633 }
3634
3635 dev_put(slave_dev);
3636 }
3637
b76cdba9 3638 up_write(&(bonding_rwsem));
1da177e4
LT		 3639 return res;
3640}
3641
3642static void bond_set_multicast_list(struct net_device *bond_dev)
3643{
3644 struct bonding *bond = bond_dev->priv;
3645 struct dev_mc_list *dmi;
3646
3647 write_lock_bh(&bond->lock);
3648
3649 /*
3650 * Do promisc before checking multicast_mode
3651 */
3652 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3653 bond_set_promiscuity(bond, 1);
3654 }
3655
3656 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3657 bond_set_promiscuity(bond, -1);
3658 }
3659
3660 /* set allmulti flag to slaves */
3661 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3662 bond_set_allmulti(bond, 1);
3663 }
3664
3665 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3666 bond_set_allmulti(bond, -1);
3667 }
3668
3669 bond->flags = bond_dev->flags;
3670
3671 /* looking for addresses to add to slaves' mc list */
3672 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3673 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3674 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3675 }
3676 }
3677
3678 /* looking for addresses to delete from slaves' list */
3679 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3680 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3681 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3682 }
3683 }
3684
3685 /* save master's multicast list */
3686 bond_mc_list_destroy(bond);
3687 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3688
3689 write_unlock_bh(&bond->lock);
3690}
3691
3692/*
3693 * Change the MTU of all of a master's slaves to match the master
3694 */
3695static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3696{
3697 struct bonding *bond = bond_dev->priv;
3698 struct slave *slave, *stop_at;
3699 int res = 0;
3700 int i;
3701
3702 dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3703 (bond_dev ? bond_dev->name : "None"), new_mtu);
3704
3705 /* Can't hold bond->lock with bh disabled here since
3706 * some base drivers panic. On the other hand we can't
3707 * hold bond->lock without bh disabled because we'll
3708 * deadlock. The only solution is to rely on the fact
3709 * that we're under rtnl_lock here, and the slaves
3710 * list won't change. This doesn't solve the problem
3711 * of setting the slave's MTU while it is
3712 * transmitting, but the assumption is that the base
3713 * driver can handle that.
3714 *
3715 * TODO: figure out a way to safely iterate the slaves
3716 * list, but without holding a lock around the actual
3717 * call to the base driver.
3718 */
3719
3720 bond_for_each_slave(bond, slave, i) {
3721 dprintk("s %p s->p %p c_m %p\n", slave,
3722 slave->prev, slave->dev->change_mtu);
e944ef79 3723
1da177e4
LT		 3724 res = dev_set_mtu(slave->dev, new_mtu);
3725
3726 if (res) {
3727 /* If we failed to set the slave's mtu to the new value
3728 * we must abort the operation even in ACTIVE_BACKUP
3729 * mode, because if we allow the backup slaves to have
3730 * different mtu values than the active slave we'll
3731 * need to change their mtu when doing a failover. That
3732 * means changing their mtu from timer context, which
3733 * is probably not a good idea.
3734 */
3735 dprintk("err %d %s\n", res, slave->dev->name);
3736 goto unwind;
3737 }
3738 }
3739
3740 bond_dev->mtu = new_mtu;
3741
3742 return 0;
3743
3744unwind:
3745 /* unwind from head to the slave that failed */
3746 stop_at = slave;
3747 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3748 int tmp_res;
3749
3750 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3751 if (tmp_res) {
3752 dprintk("unwind err %d dev %s\n", tmp_res,
3753 slave->dev->name);
3754 }
3755 }
3756
3757 return res;
3758}
3759
3760/*
3761 * Change HW address
3762 *
3763 * Note that many devices must be down to change the HW address, and
3764 * downing the master releases all slaves. We can make bonds full of
3765 * bonding devices to test this, however.
3766 */
3767static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3768{
3769 struct bonding *bond = bond_dev->priv;
3770 struct sockaddr *sa = addr, tmp_sa;
3771 struct slave *slave, *stop_at;
3772 int res = 0;
3773 int i;
3774
3775 dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3776
3777 if (!is_valid_ether_addr(sa->sa_data)) {
3778 return -EADDRNOTAVAIL;
3779 }
3780
3781 /* Can't hold bond->lock with bh disabled here since
3782 * some base drivers panic. On the other hand we can't
3783 * hold bond->lock without bh disabled because we'll
3784 * deadlock. The only solution is to rely on the fact
3785 * that we're under rtnl_lock here, and the slaves
3786 * list won't change. This doesn't solve the problem
3787 * of setting the slave's hw address while it is
3788 * transmitting, but the assumption is that the base
3789 * driver can handle that.
3790 *
3791 * TODO: figure out a way to safely iterate the slaves
3792 * list, but without holding a lock around the actual
3793 * call to the base driver.
3794 */
3795
3796 bond_for_each_slave(bond, slave, i) {
3797 dprintk("slave %p %s\n", slave, slave->dev->name);
3798
3799 if (slave->dev->set_mac_address == NULL) {
3800 res = -EOPNOTSUPP;
3801 dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3802 goto unwind;
3803 }
3804
3805 res = dev_set_mac_address(slave->dev, addr);
3806 if (res) {
3807 /* TODO: consider downing the slave
3808 * and retry ?
3809 * User should expect communications
3810 * breakage anyway until ARP finish
3811 * updating, so...
3812 */
3813 dprintk("err %d %s\n", res, slave->dev->name);
3814 goto unwind;
3815 }
3816 }
3817
3818 /* success */
3819 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3820 return 0;
3821
3822unwind:
3823 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3824 tmp_sa.sa_family = bond_dev->type;
3825
3826 /* unwind from head to the slave that failed */
3827 stop_at = slave;
3828 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3829 int tmp_res;
3830
3831 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3832 if (tmp_res) {
3833 dprintk("unwind err %d dev %s\n", tmp_res,
3834 slave->dev->name);
3835 }
3836 }
3837
3838 return res;
3839}
3840
3841static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3842{
3843 struct bonding *bond = bond_dev->priv;
3844 struct slave *slave, *start_at;
3845 int i;
3846 int res = 1;
3847
3848 read_lock(&bond->lock);
3849
3850 if (!BOND_IS_OK(bond)) {
3851 goto out;
3852 }
3853
3854 read_lock(&bond->curr_slave_lock);
3855 slave = start_at = bond->curr_active_slave;
3856 read_unlock(&bond->curr_slave_lock);
3857
3858 if (!slave) {
3859 goto out;
3860 }
3861
3862 bond_for_each_slave_from(bond, slave, i, start_at) {
3863 if (IS_UP(slave->dev) &&
3864 (slave->link == BOND_LINK_UP) &&
3865 (slave->state == BOND_STATE_ACTIVE)) {
3866 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3867
3868 write_lock(&bond->curr_slave_lock);
3869 bond->curr_active_slave = slave->next;
3870 write_unlock(&bond->curr_slave_lock);
3871
3872 break;
3873 }
3874 }
3875
3876
3877out:
3878 if (res) {
3879 /* no suitable interface, frame not sent */
3880 dev_kfree_skb(skb);
3881 }
3882 read_unlock(&bond->lock);
3883 return 0;
3884}
3885
075897ce 3886static void bond_activebackup_xmit_copy(struct sk_buff *skb,
df49898a
JL		 3887 struct bonding *bond,
3888 struct slave *slave)
075897ce
JL		 3889{
3890 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
3891 struct ethhdr *eth_data;
3892 u8 *hwaddr;
3893 int res;
3894
3895 if (!skb2) {
3896 printk(KERN_ERR DRV_NAME ": Error: "
3897 "bond_activebackup_xmit_copy(): skb_copy() failed\n");
3898 return;
3899 }
3900
3901 skb2->mac.raw = (unsigned char *)skb2->data;
3902 eth_data = eth_hdr(skb2);
3903
df49898a
JL		 3904 /* Pick an appropriate source MAC address
3905 * -- use slave's perm MAC addr, unless used by bond
3906 * -- otherwise, borrow active slave's perm MAC addr
3907 * since that will not be used
3908 */
075897ce
JL		 3909 hwaddr = slave->perm_hwaddr;
3910 if (!memcmp(eth_data->h_source, hwaddr, ETH_ALEN))
3911 hwaddr = bond->curr_active_slave->perm_hwaddr;
3912
3913 /* Set source MAC address appropriately */
3914 memcpy(eth_data->h_source, hwaddr, ETH_ALEN);
3915
3916 res = bond_dev_queue_xmit(bond, skb2, slave->dev);
3917 if (res)
3918 dev_kfree_skb(skb2);
3919
3920 return;
3921}
3922
1da177e4
LT		 3923/*
3924 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3925 * the bond has a usable interface.
3926 */
3927static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3928{
3929 struct bonding *bond = bond_dev->priv;
3930 int res = 1;
3931
1da177e4
LT		 3932 read_lock(&bond->lock);
3933 read_lock(&bond->curr_slave_lock);
3934
3935 if (!BOND_IS_OK(bond)) {
3936 goto out;
3937 }
3938
075897ce
JL		 3939 if (!bond->curr_active_slave)
3940 goto out;
3941
3942 /* Xmit IGMP frames on all slaves to ensure rapid fail-over
3943 for multicast traffic on snooping switches */
3944 if (skb->protocol == __constant_htons(ETH_P_IP) &&
3945 skb->nh.iph->protocol == IPPROTO_IGMP) {
3946 struct slave *slave, *active_slave;
3947 int i;
3948
3949 active_slave = bond->curr_active_slave;
3950 bond_for_each_slave_from_to(bond, slave, i, active_slave->next,
3951 active_slave->prev)
3952 if (IS_UP(slave->dev) &&
3953 (slave->link == BOND_LINK_UP))
3954 bond_activebackup_xmit_copy(skb, bond, slave);
1da177e4
LT		 3955 }
3956
075897ce
JL		 3957 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
3958
1da177e4
LT		 3959out:
3960 if (res) {
3961 /* no suitable interface, frame not sent */
3962 dev_kfree_skb(skb);
3963 }
3964 read_unlock(&bond->curr_slave_lock);
3965 read_unlock(&bond->lock);
3966 return 0;
3967}
3968
3969/*
169a3e66
JV		 3970 * In bond_xmit_xor() , we determine the output device by using a pre-
3971 * determined xmit_hash_policy(), If the selected device is not enabled,
3972 * find the next active slave.
1da177e4
LT		 3973 */
3974static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3975{
3976 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3977 struct slave *slave, *start_at;
3978 int slave_no;
3979 int i;
3980 int res = 1;
3981
3982 read_lock(&bond->lock);
3983
3984 if (!BOND_IS_OK(bond)) {
3985 goto out;
3986 }
3987
169a3e66 3988 slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
1da177e4
LT		 3989
3990 bond_for_each_slave(bond, slave, i) {
3991 slave_no--;
3992 if (slave_no < 0) {
3993 break;
3994 }
3995 }
3996
3997 start_at = slave;
3998
3999 bond_for_each_slave_from(bond, slave, i, start_at) {
4000 if (IS_UP(slave->dev) &&
4001 (slave->link == BOND_LINK_UP) &&
4002 (slave->state == BOND_STATE_ACTIVE)) {
4003 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4004 break;
4005 }
4006 }
4007
4008out:
4009 if (res) {
4010 /* no suitable interface, frame not sent */
4011 dev_kfree_skb(skb);
4012 }
4013 read_unlock(&bond->lock);
4014 return 0;
4015}
4016
4017/*
4018 * in broadcast mode, we send everything to all usable interfaces.
4019 */
4020static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4021{
4022 struct bonding *bond = bond_dev->priv;
4023 struct slave *slave, *start_at;
4024 struct net_device *tx_dev = NULL;
4025 int i;
4026 int res = 1;
4027
4028 read_lock(&bond->lock);
4029
4030 if (!BOND_IS_OK(bond)) {
4031 goto out;
4032 }
4033
4034 read_lock(&bond->curr_slave_lock);
4035 start_at = bond->curr_active_slave;
4036 read_unlock(&bond->curr_slave_lock);
4037
4038 if (!start_at) {
4039 goto out;
4040 }
4041
4042 bond_for_each_slave_from(bond, slave, i, start_at) {
4043 if (IS_UP(slave->dev) &&
4044 (slave->link == BOND_LINK_UP) &&
4045 (slave->state == BOND_STATE_ACTIVE)) {
4046 if (tx_dev) {
4047 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4048 if (!skb2) {
4049 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4050 ": %s: Error: bond_xmit_broadcast(): "
4051 "skb_clone() failed\n",
4052 bond_dev->name);
1da177e4
LT		 4053 continue;
4054 }
4055
4056 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4057 if (res) {
4058 dev_kfree_skb(skb2);
4059 continue;
4060 }
4061 }
4062 tx_dev = slave->dev;
4063 }
4064 }
4065
4066 if (tx_dev) {
4067 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4068 }
4069
4070out:
4071 if (res) {
4072 /* no suitable interface, frame not sent */
4073 dev_kfree_skb(skb);
4074 }
4075 /* frame sent to all suitable interfaces */
4076 read_unlock(&bond->lock);
4077 return 0;
4078}
4079
4080/*------------------------- Device initialization ---------------------------*/
4081
4082/*
4083 * set bond mode specific net device operations
4084 */
a77b5325 4085void bond_set_mode_ops(struct bonding *bond, int mode)
1da177e4 4086{
169a3e66
JV		 4087 struct net_device *bond_dev = bond->dev;
4088
1da177e4
LT		 4089 switch (mode) {
4090 case BOND_MODE_ROUNDROBIN:
4091 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4092 break;
4093 case BOND_MODE_ACTIVEBACKUP:
4094 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4095 break;
4096 case BOND_MODE_XOR:
4097 bond_dev->hard_start_xmit = bond_xmit_xor;
169a3e66
JV		 4098 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4099 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4100 else
4101 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4
LT		 4102 break;
4103 case BOND_MODE_BROADCAST:
4104 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4105 break;
4106 case BOND_MODE_8023AD:
8f903c70 4107 bond_set_master_3ad_flags(bond);
1da177e4 4108 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
169a3e66
JV		 4109 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4110 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4111 else
4112 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
1da177e4 4113 break;
1da177e4 4114 case BOND_MODE_ALB:
8f903c70
JV		 4115 bond_set_master_alb_flags(bond);
4116 /* FALLTHRU */
4117 case BOND_MODE_TLB:
1da177e4
LT		 4118 bond_dev->hard_start_xmit = bond_alb_xmit;
4119 bond_dev->set_mac_address = bond_alb_set_mac_address;
4120 break;
4121 default:
4122 /* Should never happen, mode already checked */
4123 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4124 ": %s: Error: Unknown bonding mode %d\n",
4125 bond_dev->name,
1da177e4
LT		 4126 mode);
4127 break;
4128 }
4129}
4130
217df670
JV		 4131static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4132 struct ethtool_drvinfo *drvinfo)
4133{
4134 strncpy(drvinfo->driver, DRV_NAME, 32);
4135 strncpy(drvinfo->version, DRV_VERSION, 32);
4136 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4137}
4138
7282d491 4139static const struct ethtool_ops bond_ethtool_ops = {
8531c5ff 4140 .get_tx_csum = ethtool_op_get_tx_csum,
a0de3adf
JV		 4141 .get_tso = ethtool_op_get_tso,
4142 .get_ufo = ethtool_op_get_ufo,
8531c5ff 4143 .get_sg = ethtool_op_get_sg,
217df670 4144 .get_drvinfo = bond_ethtool_get_drvinfo,
8531c5ff
AK		 4145};
4146
1da177e4
LT		 4147/*
4148 * Does not allocate but creates a /proc entry.
4149 * Allowed to fail.
4150 */
3c535952 4151static int bond_init(struct net_device *bond_dev, struct bond_params *params)
1da177e4
LT		 4152{
4153 struct bonding *bond = bond_dev->priv;
4154
4155 dprintk("Begin bond_init for %s\n", bond_dev->name);
4156
4157 /* initialize rwlocks */
4158 rwlock_init(&bond->lock);
4159 rwlock_init(&bond->curr_slave_lock);
4160
4161 bond->params = *params; /* copy params struct */
4162
4163 /* Initialize pointers */
4164 bond->first_slave = NULL;
4165 bond->curr_active_slave = NULL;
4166 bond->current_arp_slave = NULL;
4167 bond->primary_slave = NULL;
4168 bond->dev = bond_dev;
4169 INIT_LIST_HEAD(&bond->vlan_list);
4170
4171 /* Initialize the device entry points */
4172 bond_dev->open = bond_open;
4173 bond_dev->stop = bond_close;
4174 bond_dev->get_stats = bond_get_stats;
4175 bond_dev->do_ioctl = bond_do_ioctl;
8531c5ff 4176 bond_dev->ethtool_ops = &bond_ethtool_ops;
1da177e4
LT		 4177 bond_dev->set_multicast_list = bond_set_multicast_list;
4178 bond_dev->change_mtu = bond_change_mtu;
4179 bond_dev->set_mac_address = bond_set_mac_address;
4180
169a3e66 4181 bond_set_mode_ops(bond, bond->params.mode);
1da177e4
LT		 4182
4183 bond_dev->destructor = free_netdev;
4184
4185 /* Initialize the device options */
4186 bond_dev->tx_queue_len = 0;
4187 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4188
4189 /* At first, we block adding VLANs. That's the only way to
4190 * prevent problems that occur when adding VLANs over an
4191 * empty bond. The block will be removed once non-challenged
4192 * slaves are enslaved.
4193 */
4194 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4195
932ff279 4196 /* don't acquire bond device's netif_tx_lock when
1da177e4
LT		 4197 * transmitting */
4198 bond_dev->features |= NETIF_F_LLTX;
4199
4200 /* By default, we declare the bond to be fully
4201 * VLAN hardware accelerated capable. Special
4202 * care is taken in the various xmit functions
4203 * when there are slaves that are not hw accel
4204 * capable
4205 */
4206 bond_dev->vlan_rx_register = bond_vlan_rx_register;
4207 bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid;
4208 bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4209 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4210 NETIF_F_HW_VLAN_RX |
4211 NETIF_F_HW_VLAN_FILTER);
4212
4213#ifdef CONFIG_PROC_FS
4214 bond_create_proc_entry(bond);
4215#endif
4216
4217 list_add_tail(&bond->bond_list, &bond_dev_list);
4218
4219 return 0;
4220}
4221
4222/* De-initialize device specific data.
4223 * Caller must hold rtnl_lock.
4224 */
a77b5325 4225void bond_deinit(struct net_device *bond_dev)
1da177e4
LT		 4226{
4227 struct bonding *bond = bond_dev->priv;
4228
4229 list_del(&bond->bond_list);
4230
4231#ifdef CONFIG_PROC_FS
4232 bond_remove_proc_entry(bond);
4233#endif
4234}
4235
4236/* Unregister and free all bond devices.
4237 * Caller must hold rtnl_lock.
4238 */
4239static void bond_free_all(void)
4240{
4241 struct bonding *bond, *nxt;
4242
4243 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4244 struct net_device *bond_dev = bond->dev;
4245
4246 unregister_netdevice(bond_dev);
4247 bond_deinit(bond_dev);
4248 }
4249
4250#ifdef CONFIG_PROC_FS
4251 bond_destroy_proc_dir();
4252#endif
4253}
4254
4255/*------------------------- Module initialization ---------------------------*/
4256
4257/*
4258 * Convert string input module parms. Accept either the
4259 * number of the mode or its string name.
4260 */
a77b5325 4261int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
1da177e4
LT		 4262{
4263 int i;
4264
4265 for (i = 0; tbl[i].modename; i++) {
4266 if ((isdigit(*mode_arg) &&
4267 tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4268 (strncmp(mode_arg, tbl[i].modename,
4269 strlen(tbl[i].modename)) == 0)) {
4270 return tbl[i].mode;
4271 }
4272 }
4273
4274 return -1;
4275}
4276
4277static int bond_check_params(struct bond_params *params)
4278{
4279 /*
4280 * Convert string parameters.
4281 */
4282 if (mode) {
4283 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4284 if (bond_mode == -1) {
4285 printk(KERN_ERR DRV_NAME
4286 ": Error: Invalid bonding mode \"%s\"\n",
4287 mode == NULL ? "NULL" : mode);
4288 return -EINVAL;
4289 }
4290 }
4291
169a3e66
JV		 4292 if (xmit_hash_policy) {
4293 if ((bond_mode != BOND_MODE_XOR) &&
4294 (bond_mode != BOND_MODE_8023AD)) {
4295 printk(KERN_INFO DRV_NAME
4296 ": xor_mode param is irrelevant in mode %s\n",
4297 bond_mode_name(bond_mode));
4298 } else {
4299 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4300 xmit_hashtype_tbl);
4301 if (xmit_hashtype == -1) {
4302 printk(KERN_ERR DRV_NAME
4303 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4304 xmit_hash_policy == NULL ? "NULL" :
4305 xmit_hash_policy);
4306 return -EINVAL;
4307 }
4308 }
4309 }
4310
1da177e4
LT		 4311 if (lacp_rate) {
4312 if (bond_mode != BOND_MODE_8023AD) {
4313 printk(KERN_INFO DRV_NAME
4314 ": lacp_rate param is irrelevant in mode %s\n",
4315 bond_mode_name(bond_mode));
4316 } else {
4317 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4318 if (lacp_fast == -1) {
4319 printk(KERN_ERR DRV_NAME
4320 ": Error: Invalid lacp rate \"%s\"\n",
4321 lacp_rate == NULL ? "NULL" : lacp_rate);
4322 return -EINVAL;
4323 }
4324 }
4325 }
4326
4327 if (max_bonds < 1 || max_bonds > INT_MAX) {
4328 printk(KERN_WARNING DRV_NAME
4329 ": Warning: max_bonds (%d) not in range %d-%d, so it "
4e0952c7 4330 "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
1da177e4
LT		 4331 max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4332 max_bonds = BOND_DEFAULT_MAX_BONDS;
4333 }
4334
4335 if (miimon < 0) {
4336 printk(KERN_WARNING DRV_NAME
4337 ": Warning: miimon module parameter (%d), "
4338 "not in range 0-%d, so it was reset to %d\n",
4339 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4340 miimon = BOND_LINK_MON_INTERV;
4341 }
4342
4343 if (updelay < 0) {
4344 printk(KERN_WARNING DRV_NAME
4345 ": Warning: updelay module parameter (%d), "
4346 "not in range 0-%d, so it was reset to 0\n",
4347 updelay, INT_MAX);
4348 updelay = 0;
4349 }
4350
4351 if (downdelay < 0) {
4352 printk(KERN_WARNING DRV_NAME
4353 ": Warning: downdelay module parameter (%d), "
4354 "not in range 0-%d, so it was reset to 0\n",
4355 downdelay, INT_MAX);
4356 downdelay = 0;
4357 }
4358
4359 if ((use_carrier != 0) && (use_carrier != 1)) {
4360 printk(KERN_WARNING DRV_NAME
4361 ": Warning: use_carrier module parameter (%d), "
4362 "not of valid value (0/1), so it was set to 1\n",
4363 use_carrier);
4364 use_carrier = 1;
4365 }
4366
4367 /* reset values for 802.3ad */
4368 if (bond_mode == BOND_MODE_8023AD) {
4369 if (!miimon) {
4370 printk(KERN_WARNING DRV_NAME
4371 ": Warning: miimon must be specified, "
4372 "otherwise bonding will not detect link "
4373 "failure, speed and duplex which are "
4374 "essential for 802.3ad operation\n");
4375 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4376 miimon = 100;
4377 }
4378 }
4379
4380 /* reset values for TLB/ALB */
4381 if ((bond_mode == BOND_MODE_TLB) ||
4382 (bond_mode == BOND_MODE_ALB)) {
4383 if (!miimon) {
4384 printk(KERN_WARNING DRV_NAME
4385 ": Warning: miimon must be specified, "
4386 "otherwise bonding will not detect link "
4387 "failure and link speed which are essential "
4388 "for TLB/ALB load balancing\n");
4389 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4390 miimon = 100;
4391 }
4392 }
4393
4394 if (bond_mode == BOND_MODE_ALB) {
4395 printk(KERN_NOTICE DRV_NAME
4396 ": In ALB mode you might experience client "
4397 "disconnections upon reconnection of a link if the "
4398 "bonding module updelay parameter (%d msec) is "
4399 "incompatible with the forwarding delay time of the "
4400 "switch\n",
4401 updelay);
4402 }
4403
4404 if (!miimon) {
4405 if (updelay || downdelay) {
4406 /* just warn the user the up/down delay will have
4407 * no effect since miimon is zero...
4408 */
4409 printk(KERN_WARNING DRV_NAME
4410 ": Warning: miimon module parameter not set "
4411 "and updelay (%d) or downdelay (%d) module "
4412 "parameter is set; updelay and downdelay have "
4413 "no effect unless miimon is set\n",
4414 updelay, downdelay);
4415 }
4416 } else {
4417 /* don't allow arp monitoring */
4418 if (arp_interval) {
4419 printk(KERN_WARNING DRV_NAME
4420 ": Warning: miimon (%d) and arp_interval (%d) "
4421 "can't be used simultaneously, disabling ARP "
4422 "monitoring\n",
4423 miimon, arp_interval);
4424 arp_interval = 0;
4425 }
4426
4427 if ((updelay % miimon) != 0) {
4428 printk(KERN_WARNING DRV_NAME
4429 ": Warning: updelay (%d) is not a multiple "
4430 "of miimon (%d), updelay rounded to %d ms\n",
4431 updelay, miimon, (updelay / miimon) * miimon);
4432 }
4433
4434 updelay /= miimon;
4435
4436 if ((downdelay % miimon) != 0) {
4437 printk(KERN_WARNING DRV_NAME
4438 ": Warning: downdelay (%d) is not a multiple "
4439 "of miimon (%d), downdelay rounded to %d ms\n",
4440 downdelay, miimon,
4441 (downdelay / miimon) * miimon);
4442 }
4443
4444 downdelay /= miimon;
4445 }
4446
4447 if (arp_interval < 0) {
4448 printk(KERN_WARNING DRV_NAME
4449 ": Warning: arp_interval module parameter (%d) "
4450 ", not in range 0-%d, so it was reset to %d\n",
4451 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4452 arp_interval = BOND_LINK_ARP_INTERV;
4453 }
4454
4455 for (arp_ip_count = 0;
4456 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4457 arp_ip_count++) {
4458 /* not complete check, but should be good enough to
4459 catch mistakes */
4460 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4461 printk(KERN_WARNING DRV_NAME
4462 ": Warning: bad arp_ip_target module parameter "
4463 "(%s), ARP monitoring will not be performed\n",
4464 arp_ip_target[arp_ip_count]);
4465 arp_interval = 0;
4466 } else {
4467 u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4468 arp_target[arp_ip_count] = ip;
4469 }
4470 }
4471
4472 if (arp_interval && !arp_ip_count) {
4473 /* don't allow arping if no arp_ip_target given... */
4474 printk(KERN_WARNING DRV_NAME
4475 ": Warning: arp_interval module parameter (%d) "
4476 "specified without providing an arp_ip_target "
4477 "parameter, arp_interval was reset to 0\n",
4478 arp_interval);
4479 arp_interval = 0;
4480 }
4481
4482 if (miimon) {
4483 printk(KERN_INFO DRV_NAME
4484 ": MII link monitoring set to %d ms\n",
4485 miimon);
4486 } else if (arp_interval) {
4487 int i;
4488
4489 printk(KERN_INFO DRV_NAME
4490 ": ARP monitoring set to %d ms with %d target(s):",
4491 arp_interval, arp_ip_count);
4492
4493 for (i = 0; i < arp_ip_count; i++)
4494 printk (" %s", arp_ip_target[i]);
4495
4496 printk("\n");
4497
4498 } else {
4499 /* miimon and arp_interval not set, we need one so things
4500 * work as expected, see bonding.txt for details
4501 */
4502 printk(KERN_WARNING DRV_NAME
4503 ": Warning: either miimon or arp_interval and "
4504 "arp_ip_target module parameters must be specified, "
4505 "otherwise bonding will not detect link failures! see "
4506 "bonding.txt for details.\n");
4507 }
4508
4509 if (primary && !USES_PRIMARY(bond_mode)) {
4510 /* currently, using a primary only makes sense
4511 * in active backup, TLB or ALB modes
4512 */
4513 printk(KERN_WARNING DRV_NAME
4514 ": Warning: %s primary device specified but has no "
4515 "effect in %s mode\n",
4516 primary, bond_mode_name(bond_mode));
4517 primary = NULL;
4518 }
4519
4520 /* fill params struct with the proper values */
4521 params->mode = bond_mode;
169a3e66 4522 params->xmit_policy = xmit_hashtype;
1da177e4
LT		 4523 params->miimon = miimon;
4524 params->arp_interval = arp_interval;
4525 params->updelay = updelay;
4526 params->downdelay = downdelay;
4527 params->use_carrier = use_carrier;
4528 params->lacp_fast = lacp_fast;
4529 params->primary[0] = 0;
4530
4531 if (primary) {
4532 strncpy(params->primary, primary, IFNAMSIZ);
4533 params->primary[IFNAMSIZ - 1] = 0;
4534 }
4535
4536 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4537
4538 return 0;
4539}
4540
dfe60397
MW		 4541/* Create a new bond based on the specified name and bonding parameters.
4542 * Caller must NOT hold rtnl_lock; we need to release it here before we
4543 * set up our sysfs entries.
4544 */
4545int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4546{
4547 struct net_device *bond_dev;
4548 int res;
4549
4550 rtnl_lock();
4551 bond_dev = alloc_netdev(sizeof(struct bonding), name, ether_setup);
4552 if (!bond_dev) {
4553 printk(KERN_ERR DRV_NAME
4554 ": %s: eek! can't alloc netdev!\n",
4555 name);
4556 res = -ENOMEM;
4557 goto out_rtnl;
4558 }
4559
4560 /* bond_init() must be called after dev_alloc_name() (for the
4561 * /proc files), but before register_netdevice(), because we
4562 * need to set function pointers.
4563 */
4564
4565 res = bond_init(bond_dev, params);
4566 if (res < 0) {
4567 goto out_netdev;
4568 }
4569
4570 SET_MODULE_OWNER(bond_dev);
4571
4572 res = register_netdevice(bond_dev);
4573 if (res < 0) {
4574 goto out_bond;
4575 }
4576 if (newbond)
4577 *newbond = bond_dev->priv;
4578
ff59c456
JV		 4579 netif_carrier_off(bond_dev);
4580
dfe60397 4581 rtnl_unlock(); /* allows sysfs registration of net device */
b76cdba9 4582 res = bond_create_sysfs_entry(bond_dev->priv);
dfe60397
MW		 4583 goto done;
4584out_bond:
4585 bond_deinit(bond_dev);
4586out_netdev:
4587 free_netdev(bond_dev);
4588out_rtnl:
4589 rtnl_unlock();
4590done:
4591 return res;
4592}
4593
1da177e4
LT		 4594static int __init bonding_init(void)
4595{
1da177e4
LT		 4596 int i;
4597 int res;
dfe60397 4598 char new_bond_name[8]; /* Enough room for 999 bonds at init. */
1da177e4
LT		 4599
4600 printk(KERN_INFO "%s", version);
4601
dfe60397 4602 res = bond_check_params(&bonding_defaults);
1da177e4 4603 if (res) {
dfe60397 4604 goto out;
1da177e4
LT		 4605 }
4606
1da177e4
LT		 4607#ifdef CONFIG_PROC_FS
4608 bond_create_proc_dir();
4609#endif
1da177e4 4610 for (i = 0; i < max_bonds; i++) {
dfe60397
MW		 4611 sprintf(new_bond_name, "bond%d",i);
4612 res = bond_create(new_bond_name,&bonding_defaults, NULL);
4613 if (res)
4614 goto err;
1da177e4
LT		 4615 }
4616
b76cdba9
MW		 4617 res = bond_create_sysfs();
4618 if (res)
4619 goto err;
4620
1da177e4 4621 register_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4622 register_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4 4623
dfe60397
MW		 4624 goto out;
4625err:
40abc270 4626 rtnl_lock();
1da177e4 4627 bond_free_all();
b76cdba9 4628 bond_destroy_sysfs();
1da177e4 4629 rtnl_unlock();
dfe60397 4630out:
1da177e4 4631 return res;
dfe60397 4632
1da177e4
LT		 4633}
4634
4635static void __exit bonding_exit(void)
4636{
4637 unregister_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 4638 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4
LT		 4639
4640 rtnl_lock();
4641 bond_free_all();
b76cdba9 4642 bond_destroy_sysfs();
1da177e4
LT		 4643 rtnl_unlock();
4644}
4645
4646module_init(bonding_init);
4647module_exit(bonding_exit);
4648MODULE_LICENSE("GPL");
4649MODULE_VERSION(DRV_VERSION);
4650MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4651MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4652MODULE_SUPPORTED_DEVICE("most ethernet devices");
4653
4654/*
4655 * Local variables:
4656 * c-indent-level: 8
4657 * c-basic-offset: 8
4658 * tab-width: 8
4659 * End:
4660 */
4661
Clone of davem's net-next-2.6 tree