blob: 51ead7941f83ad249f6757eda2b50f6b6521d758 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Equalizer Load-balancer for serial network interfaces.
3 *
4 * (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
5 * NCM: Network and Communications Management, Inc.
6 *
7 * (c) Copyright 2002 David S. Miller (davem@redhat.com)
8 *
9 * This software may be used and distributed according to the terms
10 * of the GNU General Public License, incorporated herein by reference.
Jeff Garzik6aa20a22006-09-13 13:24:59 -040011 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * The author may be reached as simon@ncm.com, or C/O
13 * NCM
14 * Attn: Simon Janes
15 * 6803 Whittier Ave
16 * McLean VA 22101
17 * Phone: 1-703-847-0040 ext 103
18 */
19
20/*
21 * Sources:
22 * skeleton.c by Donald Becker.
23 * Inspirations:
24 * The Harried and Overworked Alan Cox
25 * Conspiracies:
Jeff Garzik6aa20a22006-09-13 13:24:59 -040026 * The Alan Cox and Mike McLagan plot to get someone else to do the code,
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 * which turned out to be me.
28 */
29
30/*
31 * $Log: eql.c,v $
32 * Revision 1.2 1996/04/11 17:51:52 guru
33 * Added one-line eql_remove_slave patch.
34 *
35 * Revision 1.1 1996/04/11 17:44:17 guru
36 * Initial revision
37 *
38 * Revision 3.13 1996/01/21 15:17:18 alan
39 * tx_queue_len changes.
40 * reformatted.
41 *
42 * Revision 3.12 1995/03/22 21:07:51 anarchy
43 * Added capable() checks on configuration.
44 * Moved header file.
45 *
46 * Revision 3.11 1995/01/19 23:14:31 guru
47 * slave_load = (ULONG_MAX - (ULONG_MAX / 2)) -
48 * (priority_Bps) + bytes_queued * 8;
49 *
50 * Revision 3.10 1995/01/19 23:07:53 guru
51 * back to
52 * slave_load = (ULONG_MAX - (ULONG_MAX / 2)) -
53 * (priority_Bps) + bytes_queued;
54 *
55 * Revision 3.9 1995/01/19 22:38:20 guru
56 * slave_load = (ULONG_MAX - (ULONG_MAX / 2)) -
57 * (priority_Bps) + bytes_queued * 4;
58 *
59 * Revision 3.8 1995/01/19 22:30:55 guru
60 * slave_load = (ULONG_MAX - (ULONG_MAX / 2)) -
61 * (priority_Bps) + bytes_queued * 2;
62 *
63 * Revision 3.7 1995/01/19 21:52:35 guru
64 * printk's trimmed out.
65 *
66 * Revision 3.6 1995/01/19 21:49:56 guru
67 * This is working pretty well. I gained 1 K/s in speed.. now it's just
68 * robustness and printk's to be diked out.
69 *
70 * Revision 3.5 1995/01/18 22:29:59 guru
71 * still crashes the kernel when the lock_wait thing is woken up.
72 *
73 * Revision 3.4 1995/01/18 21:59:47 guru
74 * Broken set-bit locking snapshot
75 *
76 * Revision 3.3 1995/01/17 22:09:18 guru
77 * infinite sleep in a lock somewhere..
78 *
79 * Revision 3.2 1995/01/15 16:46:06 guru
80 * Log trimmed of non-pertinent 1.x branch messages
81 *
82 * Revision 3.1 1995/01/15 14:41:45 guru
83 * New Scheduler and timer stuff...
84 *
85 * Revision 1.15 1995/01/15 14:29:02 guru
86 * Will make 1.14 (now 1.15) the 3.0 branch, and the 1.12 the 2.0 branch, the one
87 * with the dumber scheduler
88 *
89 * Revision 1.14 1995/01/15 02:37:08 guru
90 * shock.. the kept-new-versions could have zonked working
91 * stuff.. shudder
92 *
93 * Revision 1.13 1995/01/15 02:36:31 guru
94 * big changes
95 *
96 * scheduler was torn out and replaced with something smarter
97 *
98 * global names not prefixed with eql_ were renamed to protect
99 * against namespace collisions
100 *
101 * a few more abstract interfaces were added to facilitate any
102 * potential change of datastructure. the driver is still using
103 * a linked list of slaves. going to a heap would be a bit of
104 * an overkill.
105 *
106 * this compiles fine with no warnings.
107 *
108 * the locking mechanism and timer stuff must be written however,
109 * this version will not work otherwise
110 *
111 * Sorry, I had to rewrite most of this for 2.5.x -DaveM
112 */
113
114#include <linux/module.h>
115#include <linux/kernel.h>
116#include <linux/init.h>
117#include <linux/timer.h>
118#include <linux/netdevice.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -0700119#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121#include <linux/if.h>
122#include <linux/if_arp.h>
123#include <linux/if_eql.h>
124
125#include <asm/uaccess.h>
126
127static int eql_open(struct net_device *dev);
128static int eql_close(struct net_device *dev);
129static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
130static int eql_slave_xmit(struct sk_buff *skb, struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132#define eql_is_slave(dev) ((dev->flags & IFF_SLAVE) == IFF_SLAVE)
133#define eql_is_master(dev) ((dev->flags & IFF_MASTER) == IFF_MASTER)
134
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700135static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137static void eql_timer(unsigned long param)
138{
139 equalizer_t *eql = (equalizer_t *) param;
140 struct list_head *this, *tmp, *head;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 spin_lock_bh(&eql->queue.lock);
143 head = &eql->queue.all_slaves;
144 list_for_each_safe(this, tmp, head) {
145 slave_t *slave = list_entry(this, slave_t, list);
146
147 if ((slave->dev->flags & IFF_UP) == IFF_UP) {
148 slave->bytes_queued -= slave->priority_Bps;
149 if (slave->bytes_queued < 0)
150 slave->bytes_queued = 0;
151 } else {
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700152 eql_kill_one_slave(&eql->queue, slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 }
154
155 }
156 spin_unlock_bh(&eql->queue.lock);
157
158 eql->timer.expires = jiffies + EQL_DEFAULT_RESCHED_IVAL;
159 add_timer(&eql->timer);
160}
161
Stephen Hemmingeraec464b2009-03-20 07:14:14 +0000162static const char version[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 "Equalizer2002: Simon Janes (simon@ncm.com) and David S. Miller (davem@redhat.com)\n";
164
Stephen Hemminger99921b72008-11-21 17:37:54 -0800165static const struct net_device_ops eql_netdev_ops = {
166 .ndo_open = eql_open,
167 .ndo_stop = eql_close,
168 .ndo_do_ioctl = eql_ioctl,
169 .ndo_start_xmit = eql_slave_xmit,
170};
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172static void __init eql_setup(struct net_device *dev)
173{
174 equalizer_t *eql = netdev_priv(dev);
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 init_timer(&eql->timer);
177 eql->timer.data = (unsigned long) eql;
178 eql->timer.expires = jiffies + EQL_DEFAULT_RESCHED_IVAL;
179 eql->timer.function = eql_timer;
180
181 spin_lock_init(&eql->queue.lock);
182 INIT_LIST_HEAD(&eql->queue.all_slaves);
183 eql->queue.master_dev = dev;
184
Stephen Hemminger99921b72008-11-21 17:37:54 -0800185 dev->netdev_ops = &eql_netdev_ops;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 /*
188 * Now we undo some of the things that eth_setup does
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400189 * that we don't like
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 dev->mtu = EQL_DEFAULT_MTU; /* set to 576 in if_eql.h */
193 dev->flags = IFF_MASTER;
194
195 dev->type = ARPHRD_SLIP;
196 dev->tx_queue_len = 5; /* Hands them off fast */
197}
198
199static int eql_open(struct net_device *dev)
200{
201 equalizer_t *eql = netdev_priv(dev);
202
203 /* XXX We should force this off automatically for the user. */
204 printk(KERN_INFO "%s: remember to turn off Van-Jacobson compression on "
205 "your slave devices.\n", dev->name);
206
Eric Sesterhenn5d9428d2006-04-02 13:52:48 +0200207 BUG_ON(!list_empty(&eql->queue.all_slaves));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209 eql->min_slaves = 1;
210 eql->max_slaves = EQL_DEFAULT_MAX_SLAVES; /* 4 usually... */
211
212 add_timer(&eql->timer);
213
214 return 0;
215}
216
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700217static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
219 list_del(&slave->list);
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700220 queue->num_slaves--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 slave->dev->flags &= ~IFF_SLAVE;
222 dev_put(slave->dev);
223 kfree(slave);
224}
225
226static void eql_kill_slave_queue(slave_queue_t *queue)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400227{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 struct list_head *head, *tmp, *this;
229
230 spin_lock_bh(&queue->lock);
231
232 head = &queue->all_slaves;
233 list_for_each_safe(this, tmp, head) {
234 slave_t *s = list_entry(this, slave_t, list);
235
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700236 eql_kill_one_slave(queue, s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 }
238
239 spin_unlock_bh(&queue->lock);
240}
241
242static int eql_close(struct net_device *dev)
243{
244 equalizer_t *eql = netdev_priv(dev);
245
246 /*
247 * The timer has to be stopped first before we start hacking away
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400248 * at the data structure it scans every so often...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 */
250
251 del_timer_sync(&eql->timer);
252
253 eql_kill_slave_queue(&eql->queue);
254
255 return 0;
256}
257
258static int eql_enslave(struct net_device *dev, slaving_request_t __user *srq);
259static int eql_emancipate(struct net_device *dev, slaving_request_t __user *srq);
260
261static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
262static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
263
264static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mc);
265static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mc);
266
267static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400268{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 if (cmd != EQL_GETMASTRCFG && cmd != EQL_GETSLAVECFG &&
270 !capable(CAP_NET_ADMIN))
271 return -EPERM;
272
273 switch (cmd) {
274 case EQL_ENSLAVE:
275 return eql_enslave(dev, ifr->ifr_data);
276 case EQL_EMANCIPATE:
277 return eql_emancipate(dev, ifr->ifr_data);
278 case EQL_GETSLAVECFG:
279 return eql_g_slave_cfg(dev, ifr->ifr_data);
280 case EQL_SETSLAVECFG:
281 return eql_s_slave_cfg(dev, ifr->ifr_data);
282 case EQL_GETMASTRCFG:
283 return eql_g_master_cfg(dev, ifr->ifr_data);
284 case EQL_SETMASTRCFG:
285 return eql_s_master_cfg(dev, ifr->ifr_data);
286 default:
287 return -EOPNOTSUPP;
288 };
289}
290
291/* queue->lock must be held */
292static slave_t *__eql_schedule_slaves(slave_queue_t *queue)
293{
294 unsigned long best_load = ~0UL;
295 struct list_head *this, *tmp, *head;
296 slave_t *best_slave;
297
298 best_slave = NULL;
299
300 /* Make a pass to set the best slave. */
301 head = &queue->all_slaves;
302 list_for_each_safe(this, tmp, head) {
303 slave_t *slave = list_entry(this, slave_t, list);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400304 unsigned long slave_load, bytes_queued, priority_Bps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306 /* Go through the slave list once, updating best_slave
307 * whenever a new best_load is found.
308 */
309 bytes_queued = slave->bytes_queued;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400310 priority_Bps = slave->priority_Bps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 if ((slave->dev->flags & IFF_UP) == IFF_UP) {
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400312 slave_load = (~0UL - (~0UL / 2)) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 (priority_Bps) + bytes_queued * 8;
314
315 if (slave_load < best_load) {
316 best_load = slave_load;
317 best_slave = slave;
318 }
319 } else {
320 /* We found a dead slave, kill it. */
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700321 eql_kill_one_slave(queue, slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
323 }
324 return best_slave;
325}
326
327static int eql_slave_xmit(struct sk_buff *skb, struct net_device *dev)
328{
329 equalizer_t *eql = netdev_priv(dev);
330 slave_t *slave;
331
332 spin_lock(&eql->queue.lock);
333
334 slave = __eql_schedule_slaves(&eql->queue);
335 if (slave) {
336 struct net_device *slave_dev = slave->dev;
337
338 skb->dev = slave_dev;
339 skb->priority = 1;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400340 slave->bytes_queued += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 dev_queue_xmit(skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700342 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 } else {
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700344 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 dev_kfree_skb(skb);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400346 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348 spin_unlock(&eql->queue.lock);
349
350 return 0;
351}
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353/*
354 * Private ioctl functions
355 */
356
357/* queue->lock must be held */
358static slave_t *__eql_find_slave_dev(slave_queue_t *queue, struct net_device *dev)
359{
360 struct list_head *this, *head;
361
362 head = &queue->all_slaves;
363 list_for_each(this, head) {
364 slave_t *slave = list_entry(this, slave_t, list);
365
366 if (slave->dev == dev)
367 return slave;
368 }
369
370 return NULL;
371}
372
373static inline int eql_is_full(slave_queue_t *queue)
374{
375 equalizer_t *eql = netdev_priv(queue->master_dev);
376
377 if (queue->num_slaves >= eql->max_slaves)
378 return 1;
379 return 0;
380}
381
382/* queue->lock must be held */
383static int __eql_insert_slave(slave_queue_t *queue, slave_t *slave)
384{
385 if (!eql_is_full(queue)) {
386 slave_t *duplicate_slave = NULL;
387
388 duplicate_slave = __eql_find_slave_dev(queue, slave->dev);
Stephen Hemminger37d2e732007-08-24 22:37:49 -0700389 if (duplicate_slave)
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700390 eql_kill_one_slave(queue, duplicate_slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 list_add(&slave->list, &queue->all_slaves);
393 queue->num_slaves++;
394 slave->dev->flags |= IFF_SLAVE;
395
396 return 0;
397 }
398
399 return -ENOSPC;
400}
401
402static int eql_enslave(struct net_device *master_dev, slaving_request_t __user *srqp)
403{
404 struct net_device *slave_dev;
405 slaving_request_t srq;
406
407 if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
408 return -EFAULT;
409
Eric W. Biederman881d9662007-09-17 11:56:21 -0700410 slave_dev = dev_get_by_name(&init_net, srq.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (slave_dev) {
412 if ((master_dev->flags & IFF_UP) == IFF_UP) {
413 /* slave is not a master & not already a slave: */
414 if (!eql_is_master(slave_dev) &&
415 !eql_is_slave(slave_dev)) {
416 slave_t *s = kmalloc(sizeof(*s), GFP_KERNEL);
417 equalizer_t *eql = netdev_priv(master_dev);
418 int ret;
419
420 if (!s) {
421 dev_put(slave_dev);
422 return -ENOMEM;
423 }
424
425 memset(s, 0, sizeof(*s));
426 s->dev = slave_dev;
427 s->priority = srq.priority;
428 s->priority_bps = srq.priority;
429 s->priority_Bps = srq.priority / 8;
430
431 spin_lock_bh(&eql->queue.lock);
432 ret = __eql_insert_slave(&eql->queue, s);
433 if (ret) {
434 dev_put(slave_dev);
435 kfree(s);
436 }
437 spin_unlock_bh(&eql->queue.lock);
438
439 return ret;
440 }
441 }
442 dev_put(slave_dev);
443 }
444
445 return -EINVAL;
446}
447
448static int eql_emancipate(struct net_device *master_dev, slaving_request_t __user *srqp)
449{
450 equalizer_t *eql = netdev_priv(master_dev);
451 struct net_device *slave_dev;
452 slaving_request_t srq;
453 int ret;
454
455 if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
456 return -EFAULT;
457
Eric W. Biederman881d9662007-09-17 11:56:21 -0700458 slave_dev = dev_get_by_name(&init_net, srq.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 ret = -EINVAL;
460 if (slave_dev) {
461 spin_lock_bh(&eql->queue.lock);
462
463 if (eql_is_slave(slave_dev)) {
464 slave_t *slave = __eql_find_slave_dev(&eql->queue,
465 slave_dev);
466
467 if (slave) {
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700468 eql_kill_one_slave(&eql->queue, slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 ret = 0;
470 }
471 }
472 dev_put(slave_dev);
473
474 spin_unlock_bh(&eql->queue.lock);
475 }
476
477 return ret;
478}
479
480static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
481{
482 equalizer_t *eql = netdev_priv(dev);
483 slave_t *slave;
484 struct net_device *slave_dev;
485 slave_config_t sc;
486 int ret;
487
488 if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
489 return -EFAULT;
490
Eric W. Biederman881d9662007-09-17 11:56:21 -0700491 slave_dev = dev_get_by_name(&init_net, sc.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 if (!slave_dev)
493 return -ENODEV;
494
495 ret = -EINVAL;
496
497 spin_lock_bh(&eql->queue.lock);
498 if (eql_is_slave(slave_dev)) {
499 slave = __eql_find_slave_dev(&eql->queue, slave_dev);
500 if (slave) {
501 sc.priority = slave->priority;
502 ret = 0;
503 }
504 }
505 spin_unlock_bh(&eql->queue.lock);
506
507 dev_put(slave_dev);
508
509 if (!ret && copy_to_user(scp, &sc, sizeof (slave_config_t)))
510 ret = -EFAULT;
511
512 return ret;
513}
514
515static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
516{
517 slave_t *slave;
518 equalizer_t *eql;
519 struct net_device *slave_dev;
520 slave_config_t sc;
521 int ret;
522
523 if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
524 return -EFAULT;
525
Eric W. Biederman881d9662007-09-17 11:56:21 -0700526 slave_dev = dev_get_by_name(&init_net, sc.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 if (!slave_dev)
528 return -ENODEV;
529
530 ret = -EINVAL;
531
532 eql = netdev_priv(dev);
533 spin_lock_bh(&eql->queue.lock);
534 if (eql_is_slave(slave_dev)) {
535 slave = __eql_find_slave_dev(&eql->queue, slave_dev);
536 if (slave) {
537 slave->priority = sc.priority;
538 slave->priority_bps = sc.priority;
539 slave->priority_Bps = sc.priority / 8;
540 ret = 0;
541 }
542 }
543 spin_unlock_bh(&eql->queue.lock);
544
545 return ret;
546}
547
548static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp)
549{
550 equalizer_t *eql;
551 master_config_t mc;
552
553 if (eql_is_master(dev)) {
554 eql = netdev_priv(dev);
555 mc.max_slaves = eql->max_slaves;
556 mc.min_slaves = eql->min_slaves;
557 if (copy_to_user(mcp, &mc, sizeof (master_config_t)))
558 return -EFAULT;
559 return 0;
560 }
561 return -EINVAL;
562}
563
564static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mcp)
565{
566 equalizer_t *eql;
567 master_config_t mc;
568
569 if (copy_from_user(&mc, mcp, sizeof (master_config_t)))
570 return -EFAULT;
571
572 if (eql_is_master(dev)) {
573 eql = netdev_priv(dev);
574 eql->max_slaves = mc.max_slaves;
575 eql->min_slaves = mc.min_slaves;
576 return 0;
577 }
578 return -EINVAL;
579}
580
581static struct net_device *dev_eql;
582
583static int __init eql_init_module(void)
584{
585 int err;
586
587 printk(version);
588
589 dev_eql = alloc_netdev(sizeof(equalizer_t), "eql", eql_setup);
590 if (!dev_eql)
591 return -ENOMEM;
592
593 err = register_netdev(dev_eql);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400594 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 free_netdev(dev_eql);
596 return err;
597}
598
599static void __exit eql_cleanup_module(void)
600{
601 unregister_netdev(dev_eql);
602 free_netdev(dev_eql);
603}
604
605module_init(eql_init_module);
606module_exit(eql_cleanup_module);
607MODULE_LICENSE("GPL");