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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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. | |
6aa20a22 | 11 | * |
1da177e4 LT |
12 | * 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: | |
6aa20a22 | 26 | * The Alan Cox and Mike McLagan plot to get someone else to do the code, |
1da177e4 LT |
27 | * 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> | |
881d966b | 119 | #include <net/net_namespace.h> |
1da177e4 LT |
120 | |
121 | #include <linux/if.h> | |
122 | #include <linux/if_arp.h> | |
123 | #include <linux/if_eql.h> | |
124 | ||
125 | #include <asm/uaccess.h> | |
126 | ||
127 | static int eql_open(struct net_device *dev); | |
128 | static int eql_close(struct net_device *dev); | |
129 | static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); | |
130 | static int eql_slave_xmit(struct sk_buff *skb, struct net_device *dev); | |
1da177e4 LT |
131 | |
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 | ||
14a59e18 | 135 | static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave); |
1da177e4 LT |
136 | |
137 | static void eql_timer(unsigned long param) | |
138 | { | |
139 | equalizer_t *eql = (equalizer_t *) param; | |
140 | struct list_head *this, *tmp, *head; | |
6aa20a22 | 141 | |
1da177e4 LT |
142 | 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 { | |
14a59e18 | 152 | eql_kill_one_slave(&eql->queue, slave); |
1da177e4 LT |
153 | } |
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 | ||
aec464bb | 162 | static const char version[] __initconst = |
1da177e4 LT |
163 | "Equalizer2002: Simon Janes (simon@ncm.com) and David S. Miller (davem@redhat.com)\n"; |
164 | ||
99921b7e SH |
165 | static 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 | ||
1da177e4 LT |
172 | static void __init eql_setup(struct net_device *dev) |
173 | { | |
174 | equalizer_t *eql = netdev_priv(dev); | |
175 | ||
1da177e4 LT |
176 | 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 | ||
99921b7e | 185 | dev->netdev_ops = &eql_netdev_ops; |
6aa20a22 | 186 | |
1da177e4 LT |
187 | /* |
188 | * Now we undo some of the things that eth_setup does | |
6aa20a22 | 189 | * that we don't like |
1da177e4 | 190 | */ |
6aa20a22 | 191 | |
1da177e4 LT |
192 | 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 | ||
199 | static 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 | ||
5d9428de | 207 | BUG_ON(!list_empty(&eql->queue.all_slaves)); |
1da177e4 LT |
208 | |
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 | ||
14a59e18 | 217 | static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave) |
1da177e4 LT |
218 | { |
219 | list_del(&slave->list); | |
14a59e18 | 220 | queue->num_slaves--; |
1da177e4 LT |
221 | slave->dev->flags &= ~IFF_SLAVE; |
222 | dev_put(slave->dev); | |
223 | kfree(slave); | |
224 | } | |
225 | ||
226 | static void eql_kill_slave_queue(slave_queue_t *queue) | |
6aa20a22 | 227 | { |
1da177e4 LT |
228 | 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 | ||
14a59e18 | 236 | eql_kill_one_slave(queue, s); |
1da177e4 LT |
237 | } |
238 | ||
239 | spin_unlock_bh(&queue->lock); | |
240 | } | |
241 | ||
242 | static 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 | |
6aa20a22 | 248 | * at the data structure it scans every so often... |
1da177e4 LT |
249 | */ |
250 | ||
251 | del_timer_sync(&eql->timer); | |
252 | ||
253 | eql_kill_slave_queue(&eql->queue); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int eql_enslave(struct net_device *dev, slaving_request_t __user *srq); | |
259 | static int eql_emancipate(struct net_device *dev, slaving_request_t __user *srq); | |
260 | ||
261 | static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *sc); | |
262 | static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *sc); | |
263 | ||
264 | static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mc); | |
265 | static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mc); | |
266 | ||
267 | static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
6aa20a22 | 268 | { |
1da177e4 LT |
269 | 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 */ | |
292 | static 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); | |
6aa20a22 | 304 | unsigned long slave_load, bytes_queued, priority_Bps; |
1da177e4 LT |
305 | |
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; | |
6aa20a22 | 310 | priority_Bps = slave->priority_Bps; |
1da177e4 | 311 | if ((slave->dev->flags & IFF_UP) == IFF_UP) { |
6aa20a22 | 312 | slave_load = (~0UL - (~0UL / 2)) - |
1da177e4 LT |
313 | (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. */ | |
14a59e18 | 321 | eql_kill_one_slave(queue, slave); |
1da177e4 LT |
322 | } |
323 | } | |
324 | return best_slave; | |
325 | } | |
326 | ||
327 | static 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; | |
6aa20a22 | 340 | slave->bytes_queued += skb->len; |
1da177e4 | 341 | dev_queue_xmit(skb); |
09f75cd7 | 342 | dev->stats.tx_packets++; |
1da177e4 | 343 | } else { |
09f75cd7 | 344 | dev->stats.tx_dropped++; |
1da177e4 | 345 | dev_kfree_skb(skb); |
6aa20a22 | 346 | } |
1da177e4 LT |
347 | |
348 | spin_unlock(&eql->queue.lock); | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
1da177e4 LT |
353 | /* |
354 | * Private ioctl functions | |
355 | */ | |
356 | ||
357 | /* queue->lock must be held */ | |
358 | static 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 | ||
373 | static 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 */ | |
383 | static 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); | |
37d2e731 | 389 | if (duplicate_slave) |
14a59e18 | 390 | eql_kill_one_slave(queue, duplicate_slave); |
1da177e4 LT |
391 | |
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 | ||
402 | static 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 | ||
881d966b | 410 | slave_dev = dev_get_by_name(&init_net, srq.slave_name); |
1da177e4 LT |
411 | 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 | ||
448 | static 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 | ||
881d966b | 458 | slave_dev = dev_get_by_name(&init_net, srq.slave_name); |
1da177e4 LT |
459 | 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) { | |
14a59e18 | 468 | eql_kill_one_slave(&eql->queue, slave); |
1da177e4 LT |
469 | ret = 0; |
470 | } | |
471 | } | |
472 | dev_put(slave_dev); | |
473 | ||
474 | spin_unlock_bh(&eql->queue.lock); | |
475 | } | |
476 | ||
477 | return ret; | |
478 | } | |
479 | ||
480 | static 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 | ||
881d966b | 491 | slave_dev = dev_get_by_name(&init_net, sc.slave_name); |
1da177e4 LT |
492 | 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 | ||
515 | static 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 | ||
881d966b | 526 | slave_dev = dev_get_by_name(&init_net, sc.slave_name); |
1da177e4 LT |
527 | 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 | ||
93889d75 YH |
545 | dev_put(slave_dev); |
546 | ||
1da177e4 LT |
547 | return ret; |
548 | } | |
549 | ||
550 | static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp) | |
551 | { | |
552 | equalizer_t *eql; | |
553 | master_config_t mc; | |
554 | ||
555 | if (eql_is_master(dev)) { | |
556 | eql = netdev_priv(dev); | |
557 | mc.max_slaves = eql->max_slaves; | |
558 | mc.min_slaves = eql->min_slaves; | |
559 | if (copy_to_user(mcp, &mc, sizeof (master_config_t))) | |
560 | return -EFAULT; | |
561 | return 0; | |
562 | } | |
563 | return -EINVAL; | |
564 | } | |
565 | ||
566 | static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mcp) | |
567 | { | |
568 | equalizer_t *eql; | |
569 | master_config_t mc; | |
570 | ||
571 | if (copy_from_user(&mc, mcp, sizeof (master_config_t))) | |
572 | return -EFAULT; | |
573 | ||
574 | if (eql_is_master(dev)) { | |
575 | eql = netdev_priv(dev); | |
576 | eql->max_slaves = mc.max_slaves; | |
577 | eql->min_slaves = mc.min_slaves; | |
578 | return 0; | |
579 | } | |
580 | return -EINVAL; | |
581 | } | |
582 | ||
583 | static struct net_device *dev_eql; | |
584 | ||
585 | static int __init eql_init_module(void) | |
586 | { | |
587 | int err; | |
588 | ||
589 | printk(version); | |
590 | ||
591 | dev_eql = alloc_netdev(sizeof(equalizer_t), "eql", eql_setup); | |
592 | if (!dev_eql) | |
593 | return -ENOMEM; | |
594 | ||
595 | err = register_netdev(dev_eql); | |
6aa20a22 | 596 | if (err) |
1da177e4 LT |
597 | free_netdev(dev_eql); |
598 | return err; | |
599 | } | |
600 | ||
601 | static void __exit eql_cleanup_module(void) | |
602 | { | |
603 | unregister_netdev(dev_eql); | |
604 | free_netdev(dev_eql); | |
605 | } | |
606 | ||
607 | module_init(eql_init_module); | |
608 | module_exit(eql_cleanup_module); | |
609 | MODULE_LICENSE("GPL"); |