blob: 19b7dd983944d84add883ee3f0d50abf270e0b80 [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 */
Eric Dumazet93f154b2009-05-18 22:19:19 -0700197 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
200static int eql_open(struct net_device *dev)
201{
202 equalizer_t *eql = netdev_priv(dev);
203
204 /* XXX We should force this off automatically for the user. */
205 printk(KERN_INFO "%s: remember to turn off Van-Jacobson compression on "
206 "your slave devices.\n", dev->name);
207
Eric Sesterhenn5d9428d2006-04-02 13:52:48 +0200208 BUG_ON(!list_empty(&eql->queue.all_slaves));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 eql->min_slaves = 1;
211 eql->max_slaves = EQL_DEFAULT_MAX_SLAVES; /* 4 usually... */
212
213 add_timer(&eql->timer);
214
215 return 0;
216}
217
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700218static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
220 list_del(&slave->list);
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700221 queue->num_slaves--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 slave->dev->flags &= ~IFF_SLAVE;
223 dev_put(slave->dev);
224 kfree(slave);
225}
226
227static void eql_kill_slave_queue(slave_queue_t *queue)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400228{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 struct list_head *head, *tmp, *this;
230
231 spin_lock_bh(&queue->lock);
232
233 head = &queue->all_slaves;
234 list_for_each_safe(this, tmp, head) {
235 slave_t *s = list_entry(this, slave_t, list);
236
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700237 eql_kill_one_slave(queue, s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
239
240 spin_unlock_bh(&queue->lock);
241}
242
243static int eql_close(struct net_device *dev)
244{
245 equalizer_t *eql = netdev_priv(dev);
246
247 /*
248 * The timer has to be stopped first before we start hacking away
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400249 * at the data structure it scans every so often...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 */
251
252 del_timer_sync(&eql->timer);
253
254 eql_kill_slave_queue(&eql->queue);
255
256 return 0;
257}
258
259static int eql_enslave(struct net_device *dev, slaving_request_t __user *srq);
260static int eql_emancipate(struct net_device *dev, slaving_request_t __user *srq);
261
262static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
263static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
264
265static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mc);
266static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mc);
267
268static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400269{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 if (cmd != EQL_GETMASTRCFG && cmd != EQL_GETSLAVECFG &&
271 !capable(CAP_NET_ADMIN))
272 return -EPERM;
273
274 switch (cmd) {
275 case EQL_ENSLAVE:
276 return eql_enslave(dev, ifr->ifr_data);
277 case EQL_EMANCIPATE:
278 return eql_emancipate(dev, ifr->ifr_data);
279 case EQL_GETSLAVECFG:
280 return eql_g_slave_cfg(dev, ifr->ifr_data);
281 case EQL_SETSLAVECFG:
282 return eql_s_slave_cfg(dev, ifr->ifr_data);
283 case EQL_GETMASTRCFG:
284 return eql_g_master_cfg(dev, ifr->ifr_data);
285 case EQL_SETMASTRCFG:
286 return eql_s_master_cfg(dev, ifr->ifr_data);
287 default:
288 return -EOPNOTSUPP;
289 };
290}
291
292/* queue->lock must be held */
293static slave_t *__eql_schedule_slaves(slave_queue_t *queue)
294{
295 unsigned long best_load = ~0UL;
296 struct list_head *this, *tmp, *head;
297 slave_t *best_slave;
298
299 best_slave = NULL;
300
301 /* Make a pass to set the best slave. */
302 head = &queue->all_slaves;
303 list_for_each_safe(this, tmp, head) {
304 slave_t *slave = list_entry(this, slave_t, list);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400305 unsigned long slave_load, bytes_queued, priority_Bps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 /* Go through the slave list once, updating best_slave
308 * whenever a new best_load is found.
309 */
310 bytes_queued = slave->bytes_queued;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400311 priority_Bps = slave->priority_Bps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 if ((slave->dev->flags & IFF_UP) == IFF_UP) {
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400313 slave_load = (~0UL - (~0UL / 2)) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 (priority_Bps) + bytes_queued * 8;
315
316 if (slave_load < best_load) {
317 best_load = slave_load;
318 best_slave = slave;
319 }
320 } else {
321 /* We found a dead slave, kill it. */
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700322 eql_kill_one_slave(queue, slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 }
324 }
325 return best_slave;
326}
327
328static int eql_slave_xmit(struct sk_buff *skb, struct net_device *dev)
329{
330 equalizer_t *eql = netdev_priv(dev);
331 slave_t *slave;
332
333 spin_lock(&eql->queue.lock);
334
335 slave = __eql_schedule_slaves(&eql->queue);
336 if (slave) {
337 struct net_device *slave_dev = slave->dev;
338
339 skb->dev = slave_dev;
340 skb->priority = 1;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400341 slave->bytes_queued += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 dev_queue_xmit(skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700343 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 } else {
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700345 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 dev_kfree_skb(skb);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 spin_unlock(&eql->queue.lock);
350
351 return 0;
352}
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354/*
355 * Private ioctl functions
356 */
357
358/* queue->lock must be held */
359static slave_t *__eql_find_slave_dev(slave_queue_t *queue, struct net_device *dev)
360{
361 struct list_head *this, *head;
362
363 head = &queue->all_slaves;
364 list_for_each(this, head) {
365 slave_t *slave = list_entry(this, slave_t, list);
366
367 if (slave->dev == dev)
368 return slave;
369 }
370
371 return NULL;
372}
373
374static inline int eql_is_full(slave_queue_t *queue)
375{
376 equalizer_t *eql = netdev_priv(queue->master_dev);
377
378 if (queue->num_slaves >= eql->max_slaves)
379 return 1;
380 return 0;
381}
382
383/* queue->lock must be held */
384static int __eql_insert_slave(slave_queue_t *queue, slave_t *slave)
385{
386 if (!eql_is_full(queue)) {
387 slave_t *duplicate_slave = NULL;
388
389 duplicate_slave = __eql_find_slave_dev(queue, slave->dev);
Stephen Hemminger37d2e732007-08-24 22:37:49 -0700390 if (duplicate_slave)
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700391 eql_kill_one_slave(queue, duplicate_slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 list_add(&slave->list, &queue->all_slaves);
394 queue->num_slaves++;
395 slave->dev->flags |= IFF_SLAVE;
396
397 return 0;
398 }
399
400 return -ENOSPC;
401}
402
403static int eql_enslave(struct net_device *master_dev, slaving_request_t __user *srqp)
404{
405 struct net_device *slave_dev;
406 slaving_request_t srq;
407
408 if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
409 return -EFAULT;
410
Eric W. Biederman881d9662007-09-17 11:56:21 -0700411 slave_dev = dev_get_by_name(&init_net, srq.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 if (slave_dev) {
413 if ((master_dev->flags & IFF_UP) == IFF_UP) {
414 /* slave is not a master & not already a slave: */
415 if (!eql_is_master(slave_dev) &&
416 !eql_is_slave(slave_dev)) {
417 slave_t *s = kmalloc(sizeof(*s), GFP_KERNEL);
418 equalizer_t *eql = netdev_priv(master_dev);
419 int ret;
420
421 if (!s) {
422 dev_put(slave_dev);
423 return -ENOMEM;
424 }
425
426 memset(s, 0, sizeof(*s));
427 s->dev = slave_dev;
428 s->priority = srq.priority;
429 s->priority_bps = srq.priority;
430 s->priority_Bps = srq.priority / 8;
431
432 spin_lock_bh(&eql->queue.lock);
433 ret = __eql_insert_slave(&eql->queue, s);
434 if (ret) {
435 dev_put(slave_dev);
436 kfree(s);
437 }
438 spin_unlock_bh(&eql->queue.lock);
439
440 return ret;
441 }
442 }
443 dev_put(slave_dev);
444 }
445
446 return -EINVAL;
447}
448
449static int eql_emancipate(struct net_device *master_dev, slaving_request_t __user *srqp)
450{
451 equalizer_t *eql = netdev_priv(master_dev);
452 struct net_device *slave_dev;
453 slaving_request_t srq;
454 int ret;
455
456 if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
457 return -EFAULT;
458
Eric W. Biederman881d9662007-09-17 11:56:21 -0700459 slave_dev = dev_get_by_name(&init_net, srq.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 ret = -EINVAL;
461 if (slave_dev) {
462 spin_lock_bh(&eql->queue.lock);
463
464 if (eql_is_slave(slave_dev)) {
465 slave_t *slave = __eql_find_slave_dev(&eql->queue,
466 slave_dev);
467
468 if (slave) {
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700469 eql_kill_one_slave(&eql->queue, slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 ret = 0;
471 }
472 }
473 dev_put(slave_dev);
474
475 spin_unlock_bh(&eql->queue.lock);
476 }
477
478 return ret;
479}
480
481static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
482{
483 equalizer_t *eql = netdev_priv(dev);
484 slave_t *slave;
485 struct net_device *slave_dev;
486 slave_config_t sc;
487 int ret;
488
489 if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
490 return -EFAULT;
491
Eric W. Biederman881d9662007-09-17 11:56:21 -0700492 slave_dev = dev_get_by_name(&init_net, sc.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 if (!slave_dev)
494 return -ENODEV;
495
496 ret = -EINVAL;
497
498 spin_lock_bh(&eql->queue.lock);
499 if (eql_is_slave(slave_dev)) {
500 slave = __eql_find_slave_dev(&eql->queue, slave_dev);
501 if (slave) {
502 sc.priority = slave->priority;
503 ret = 0;
504 }
505 }
506 spin_unlock_bh(&eql->queue.lock);
507
508 dev_put(slave_dev);
509
510 if (!ret && copy_to_user(scp, &sc, sizeof (slave_config_t)))
511 ret = -EFAULT;
512
513 return ret;
514}
515
516static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
517{
518 slave_t *slave;
519 equalizer_t *eql;
520 struct net_device *slave_dev;
521 slave_config_t sc;
522 int ret;
523
524 if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
525 return -EFAULT;
526
Eric W. Biederman881d9662007-09-17 11:56:21 -0700527 slave_dev = dev_get_by_name(&init_net, sc.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 if (!slave_dev)
529 return -ENODEV;
530
531 ret = -EINVAL;
532
533 eql = netdev_priv(dev);
534 spin_lock_bh(&eql->queue.lock);
535 if (eql_is_slave(slave_dev)) {
536 slave = __eql_find_slave_dev(&eql->queue, slave_dev);
537 if (slave) {
538 slave->priority = sc.priority;
539 slave->priority_bps = sc.priority;
540 slave->priority_Bps = sc.priority / 8;
541 ret = 0;
542 }
543 }
544 spin_unlock_bh(&eql->queue.lock);
545
Yang Hongyang93889d72009-04-08 15:56:33 -0700546 dev_put(slave_dev);
547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return ret;
549}
550
551static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp)
552{
553 equalizer_t *eql;
554 master_config_t mc;
555
556 if (eql_is_master(dev)) {
557 eql = netdev_priv(dev);
558 mc.max_slaves = eql->max_slaves;
559 mc.min_slaves = eql->min_slaves;
560 if (copy_to_user(mcp, &mc, sizeof (master_config_t)))
561 return -EFAULT;
562 return 0;
563 }
564 return -EINVAL;
565}
566
567static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mcp)
568{
569 equalizer_t *eql;
570 master_config_t mc;
571
572 if (copy_from_user(&mc, mcp, sizeof (master_config_t)))
573 return -EFAULT;
574
575 if (eql_is_master(dev)) {
576 eql = netdev_priv(dev);
577 eql->max_slaves = mc.max_slaves;
578 eql->min_slaves = mc.min_slaves;
579 return 0;
580 }
581 return -EINVAL;
582}
583
584static struct net_device *dev_eql;
585
586static int __init eql_init_module(void)
587{
588 int err;
589
590 printk(version);
591
592 dev_eql = alloc_netdev(sizeof(equalizer_t), "eql", eql_setup);
593 if (!dev_eql)
594 return -ENOMEM;
595
596 err = register_netdev(dev_eql);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400597 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 free_netdev(dev_eql);
599 return err;
600}
601
602static void __exit eql_cleanup_module(void)
603{
604 unregister_netdev(dev_eql);
605 free_netdev(dev_eql);
606}
607
608module_init(eql_init_module);
609module_exit(eql_cleanup_module);
610MODULE_LICENSE("GPL");