blob: b34a2ddeef4c810b37dca41faad2ed4cc12955b9 [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
Alexey Dobriyand43c36d2009-10-07 17:09:06 +0400114#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#include <linux/module.h>
116#include <linux/kernel.h>
117#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +0900118#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#include <linux/timer.h>
120#include <linux/netdevice.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -0700121#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123#include <linux/if.h>
124#include <linux/if_arp.h>
125#include <linux/if_eql.h>
126
127#include <asm/uaccess.h>
128
129static int eql_open(struct net_device *dev);
130static int eql_close(struct net_device *dev);
131static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
Stephen Hemminger424efe92009-08-31 19:50:51 +0000132static netdev_tx_t eql_slave_xmit(struct sk_buff *skb, struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134#define eql_is_slave(dev) ((dev->flags & IFF_SLAVE) == IFF_SLAVE)
135#define eql_is_master(dev) ((dev->flags & IFF_MASTER) == IFF_MASTER)
136
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700137static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139static void eql_timer(unsigned long param)
140{
141 equalizer_t *eql = (equalizer_t *) param;
142 struct list_head *this, *tmp, *head;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 spin_lock_bh(&eql->queue.lock);
145 head = &eql->queue.all_slaves;
146 list_for_each_safe(this, tmp, head) {
147 slave_t *slave = list_entry(this, slave_t, list);
148
149 if ((slave->dev->flags & IFF_UP) == IFF_UP) {
150 slave->bytes_queued -= slave->priority_Bps;
151 if (slave->bytes_queued < 0)
152 slave->bytes_queued = 0;
153 } else {
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700154 eql_kill_one_slave(&eql->queue, slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 }
156
157 }
158 spin_unlock_bh(&eql->queue.lock);
159
160 eql->timer.expires = jiffies + EQL_DEFAULT_RESCHED_IVAL;
161 add_timer(&eql->timer);
162}
163
Stephen Hemmingeraec464b2009-03-20 07:14:14 +0000164static const char version[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 "Equalizer2002: Simon Janes (simon@ncm.com) and David S. Miller (davem@redhat.com)\n";
166
Stephen Hemminger99921b72008-11-21 17:37:54 -0800167static const struct net_device_ops eql_netdev_ops = {
168 .ndo_open = eql_open,
169 .ndo_stop = eql_close,
170 .ndo_do_ioctl = eql_ioctl,
171 .ndo_start_xmit = eql_slave_xmit,
172};
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174static void __init eql_setup(struct net_device *dev)
175{
176 equalizer_t *eql = netdev_priv(dev);
177
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 init_timer(&eql->timer);
179 eql->timer.data = (unsigned long) eql;
180 eql->timer.expires = jiffies + EQL_DEFAULT_RESCHED_IVAL;
181 eql->timer.function = eql_timer;
182
183 spin_lock_init(&eql->queue.lock);
184 INIT_LIST_HEAD(&eql->queue.all_slaves);
185 eql->queue.master_dev = dev;
186
Stephen Hemminger99921b72008-11-21 17:37:54 -0800187 dev->netdev_ops = &eql_netdev_ops;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 /*
190 * Now we undo some of the things that eth_setup does
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400191 * that we don't like
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 dev->mtu = EQL_DEFAULT_MTU; /* set to 576 in if_eql.h */
195 dev->flags = IFF_MASTER;
196
197 dev->type = ARPHRD_SLIP;
198 dev->tx_queue_len = 5; /* Hands them off fast */
Eric Dumazet93f154b2009-05-18 22:19:19 -0700199 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
202static int eql_open(struct net_device *dev)
203{
204 equalizer_t *eql = netdev_priv(dev);
205
206 /* XXX We should force this off automatically for the user. */
207 printk(KERN_INFO "%s: remember to turn off Van-Jacobson compression on "
208 "your slave devices.\n", dev->name);
209
Eric Sesterhenn5d9428d2006-04-02 13:52:48 +0200210 BUG_ON(!list_empty(&eql->queue.all_slaves));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 eql->min_slaves = 1;
213 eql->max_slaves = EQL_DEFAULT_MAX_SLAVES; /* 4 usually... */
214
215 add_timer(&eql->timer);
216
217 return 0;
218}
219
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700220static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
222 list_del(&slave->list);
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700223 queue->num_slaves--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 slave->dev->flags &= ~IFF_SLAVE;
225 dev_put(slave->dev);
226 kfree(slave);
227}
228
229static void eql_kill_slave_queue(slave_queue_t *queue)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400230{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 struct list_head *head, *tmp, *this;
232
233 spin_lock_bh(&queue->lock);
234
235 head = &queue->all_slaves;
236 list_for_each_safe(this, tmp, head) {
237 slave_t *s = list_entry(this, slave_t, list);
238
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700239 eql_kill_one_slave(queue, s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 }
241
242 spin_unlock_bh(&queue->lock);
243}
244
245static int eql_close(struct net_device *dev)
246{
247 equalizer_t *eql = netdev_priv(dev);
248
249 /*
250 * The timer has to be stopped first before we start hacking away
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400251 * at the data structure it scans every so often...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 */
253
254 del_timer_sync(&eql->timer);
255
256 eql_kill_slave_queue(&eql->queue);
257
258 return 0;
259}
260
261static int eql_enslave(struct net_device *dev, slaving_request_t __user *srq);
262static int eql_emancipate(struct net_device *dev, slaving_request_t __user *srq);
263
264static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
265static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
266
267static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mc);
268static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mc);
269
270static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400271{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 if (cmd != EQL_GETMASTRCFG && cmd != EQL_GETSLAVECFG &&
273 !capable(CAP_NET_ADMIN))
274 return -EPERM;
275
276 switch (cmd) {
277 case EQL_ENSLAVE:
278 return eql_enslave(dev, ifr->ifr_data);
279 case EQL_EMANCIPATE:
280 return eql_emancipate(dev, ifr->ifr_data);
281 case EQL_GETSLAVECFG:
282 return eql_g_slave_cfg(dev, ifr->ifr_data);
283 case EQL_SETSLAVECFG:
284 return eql_s_slave_cfg(dev, ifr->ifr_data);
285 case EQL_GETMASTRCFG:
286 return eql_g_master_cfg(dev, ifr->ifr_data);
287 case EQL_SETMASTRCFG:
288 return eql_s_master_cfg(dev, ifr->ifr_data);
289 default:
290 return -EOPNOTSUPP;
291 };
292}
293
294/* queue->lock must be held */
295static slave_t *__eql_schedule_slaves(slave_queue_t *queue)
296{
297 unsigned long best_load = ~0UL;
298 struct list_head *this, *tmp, *head;
299 slave_t *best_slave;
300
301 best_slave = NULL;
302
303 /* Make a pass to set the best slave. */
304 head = &queue->all_slaves;
305 list_for_each_safe(this, tmp, head) {
306 slave_t *slave = list_entry(this, slave_t, list);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400307 unsigned long slave_load, bytes_queued, priority_Bps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 /* Go through the slave list once, updating best_slave
310 * whenever a new best_load is found.
311 */
312 bytes_queued = slave->bytes_queued;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400313 priority_Bps = slave->priority_Bps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 if ((slave->dev->flags & IFF_UP) == IFF_UP) {
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400315 slave_load = (~0UL - (~0UL / 2)) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 (priority_Bps) + bytes_queued * 8;
317
318 if (slave_load < best_load) {
319 best_load = slave_load;
320 best_slave = slave;
321 }
322 } else {
323 /* We found a dead slave, kill it. */
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700324 eql_kill_one_slave(queue, slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 }
326 }
327 return best_slave;
328}
329
Stephen Hemminger424efe92009-08-31 19:50:51 +0000330static netdev_tx_t eql_slave_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
332 equalizer_t *eql = netdev_priv(dev);
333 slave_t *slave;
334
335 spin_lock(&eql->queue.lock);
336
337 slave = __eql_schedule_slaves(&eql->queue);
338 if (slave) {
339 struct net_device *slave_dev = slave->dev;
340
341 skb->dev = slave_dev;
342 skb->priority = 1;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400343 slave->bytes_queued += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 dev_queue_xmit(skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700345 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 } else {
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700347 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 dev_kfree_skb(skb);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400349 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351 spin_unlock(&eql->queue.lock);
352
Patrick McHardy6ed10652009-06-23 06:03:08 +0000353 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354}
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356/*
357 * Private ioctl functions
358 */
359
360/* queue->lock must be held */
361static slave_t *__eql_find_slave_dev(slave_queue_t *queue, struct net_device *dev)
362{
363 struct list_head *this, *head;
364
365 head = &queue->all_slaves;
366 list_for_each(this, head) {
367 slave_t *slave = list_entry(this, slave_t, list);
368
369 if (slave->dev == dev)
370 return slave;
371 }
372
373 return NULL;
374}
375
376static inline int eql_is_full(slave_queue_t *queue)
377{
378 equalizer_t *eql = netdev_priv(queue->master_dev);
379
380 if (queue->num_slaves >= eql->max_slaves)
381 return 1;
382 return 0;
383}
384
385/* queue->lock must be held */
386static int __eql_insert_slave(slave_queue_t *queue, slave_t *slave)
387{
388 if (!eql_is_full(queue)) {
389 slave_t *duplicate_slave = NULL;
390
391 duplicate_slave = __eql_find_slave_dev(queue, slave->dev);
Stephen Hemminger37d2e732007-08-24 22:37:49 -0700392 if (duplicate_slave)
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700393 eql_kill_one_slave(queue, duplicate_slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395 list_add(&slave->list, &queue->all_slaves);
396 queue->num_slaves++;
397 slave->dev->flags |= IFF_SLAVE;
398
399 return 0;
400 }
401
402 return -ENOSPC;
403}
404
405static int eql_enslave(struct net_device *master_dev, slaving_request_t __user *srqp)
406{
407 struct net_device *slave_dev;
408 slaving_request_t srq;
409
410 if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
411 return -EFAULT;
412
Eric W. Biederman881d9662007-09-17 11:56:21 -0700413 slave_dev = dev_get_by_name(&init_net, srq.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 if (slave_dev) {
415 if ((master_dev->flags & IFF_UP) == IFF_UP) {
416 /* slave is not a master & not already a slave: */
417 if (!eql_is_master(slave_dev) &&
418 !eql_is_slave(slave_dev)) {
419 slave_t *s = kmalloc(sizeof(*s), GFP_KERNEL);
420 equalizer_t *eql = netdev_priv(master_dev);
421 int ret;
422
423 if (!s) {
424 dev_put(slave_dev);
425 return -ENOMEM;
426 }
427
428 memset(s, 0, sizeof(*s));
429 s->dev = slave_dev;
430 s->priority = srq.priority;
431 s->priority_bps = srq.priority;
432 s->priority_Bps = srq.priority / 8;
433
434 spin_lock_bh(&eql->queue.lock);
435 ret = __eql_insert_slave(&eql->queue, s);
436 if (ret) {
437 dev_put(slave_dev);
438 kfree(s);
439 }
440 spin_unlock_bh(&eql->queue.lock);
441
442 return ret;
443 }
444 }
445 dev_put(slave_dev);
446 }
447
448 return -EINVAL;
449}
450
451static int eql_emancipate(struct net_device *master_dev, slaving_request_t __user *srqp)
452{
453 equalizer_t *eql = netdev_priv(master_dev);
454 struct net_device *slave_dev;
455 slaving_request_t srq;
456 int ret;
457
458 if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
459 return -EFAULT;
460
Eric W. Biederman881d9662007-09-17 11:56:21 -0700461 slave_dev = dev_get_by_name(&init_net, srq.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 ret = -EINVAL;
463 if (slave_dev) {
464 spin_lock_bh(&eql->queue.lock);
465
466 if (eql_is_slave(slave_dev)) {
467 slave_t *slave = __eql_find_slave_dev(&eql->queue,
468 slave_dev);
469
470 if (slave) {
Loic Le Loarer14a59e12005-07-21 14:16:54 -0700471 eql_kill_one_slave(&eql->queue, slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 ret = 0;
473 }
474 }
475 dev_put(slave_dev);
476
477 spin_unlock_bh(&eql->queue.lock);
478 }
479
480 return ret;
481}
482
483static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
484{
485 equalizer_t *eql = netdev_priv(dev);
486 slave_t *slave;
487 struct net_device *slave_dev;
488 slave_config_t sc;
489 int ret;
490
491 if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
492 return -EFAULT;
493
Eric W. Biederman881d9662007-09-17 11:56:21 -0700494 slave_dev = dev_get_by_name(&init_net, sc.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if (!slave_dev)
496 return -ENODEV;
497
498 ret = -EINVAL;
499
500 spin_lock_bh(&eql->queue.lock);
501 if (eql_is_slave(slave_dev)) {
502 slave = __eql_find_slave_dev(&eql->queue, slave_dev);
503 if (slave) {
504 sc.priority = slave->priority;
505 ret = 0;
506 }
507 }
508 spin_unlock_bh(&eql->queue.lock);
509
510 dev_put(slave_dev);
511
512 if (!ret && copy_to_user(scp, &sc, sizeof (slave_config_t)))
513 ret = -EFAULT;
514
515 return ret;
516}
517
518static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
519{
520 slave_t *slave;
521 equalizer_t *eql;
522 struct net_device *slave_dev;
523 slave_config_t sc;
524 int ret;
525
526 if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
527 return -EFAULT;
528
Eric W. Biederman881d9662007-09-17 11:56:21 -0700529 slave_dev = dev_get_by_name(&init_net, sc.slave_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 if (!slave_dev)
531 return -ENODEV;
532
533 ret = -EINVAL;
534
535 eql = netdev_priv(dev);
536 spin_lock_bh(&eql->queue.lock);
537 if (eql_is_slave(slave_dev)) {
538 slave = __eql_find_slave_dev(&eql->queue, slave_dev);
539 if (slave) {
540 slave->priority = sc.priority;
541 slave->priority_bps = sc.priority;
542 slave->priority_Bps = sc.priority / 8;
543 ret = 0;
544 }
545 }
546 spin_unlock_bh(&eql->queue.lock);
547
Yang Hongyang93889d72009-04-08 15:56:33 -0700548 dev_put(slave_dev);
549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 return ret;
551}
552
553static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp)
554{
555 equalizer_t *eql;
556 master_config_t mc;
557
558 if (eql_is_master(dev)) {
559 eql = netdev_priv(dev);
560 mc.max_slaves = eql->max_slaves;
561 mc.min_slaves = eql->min_slaves;
562 if (copy_to_user(mcp, &mc, sizeof (master_config_t)))
563 return -EFAULT;
564 return 0;
565 }
566 return -EINVAL;
567}
568
569static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mcp)
570{
571 equalizer_t *eql;
572 master_config_t mc;
573
574 if (copy_from_user(&mc, mcp, sizeof (master_config_t)))
575 return -EFAULT;
576
577 if (eql_is_master(dev)) {
578 eql = netdev_priv(dev);
579 eql->max_slaves = mc.max_slaves;
580 eql->min_slaves = mc.min_slaves;
581 return 0;
582 }
583 return -EINVAL;
584}
585
586static struct net_device *dev_eql;
587
588static int __init eql_init_module(void)
589{
590 int err;
591
592 printk(version);
593
594 dev_eql = alloc_netdev(sizeof(equalizer_t), "eql", eql_setup);
595 if (!dev_eql)
596 return -ENOMEM;
597
598 err = register_netdev(dev_eql);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400599 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 free_netdev(dev_eql);
601 return err;
602}
603
604static void __exit eql_cleanup_module(void)
605{
606 unregister_netdev(dev_eql);
607 free_netdev(dev_eql);
608}
609
610module_init(eql_init_module);
611module_exit(eql_cleanup_module);
612MODULE_LICENSE("GPL");