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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* net/sched/sch_teql.c "True" (or "trivial") link equalizer.
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License
5 * as published by the Free Software Foundation; either version
6 * 2 of the License, or (at your option) any later version.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 */
10
11#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/types.h>
13#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/errno.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020017#include <linux/if_arp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/netdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/skbuff.h>
21#include <linux/moduleparam.h>
Patrick McHardy0ba48052007-07-02 22:49:07 -070022#include <net/dst.h>
23#include <net/neighbour.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <net/pkt_sched.h>
25
26/*
27 How to setup it.
28 ----------------
29
30 After loading this module you will find a new device teqlN
31 and new qdisc with the same name. To join a slave to the equalizer
32 you should just set this qdisc on a device f.e.
33
34 # tc qdisc add dev eth0 root teql0
35 # tc qdisc add dev eth1 root teql0
36
37 That's all. Full PnP 8)
38
39 Applicability.
40 --------------
41
42 1. Slave devices MUST be active devices, i.e., they must raise the tbusy
43 signal and generate EOI events. If you want to equalize virtual devices
44 like tunnels, use a normal eql device.
45 2. This device puts no limitations on physical slave characteristics
46 f.e. it will equalize 9600baud line and 100Mb ethernet perfectly :-)
47 Certainly, large difference in link speeds will make the resulting
48 eqalized link unusable, because of huge packet reordering.
49 I estimate an upper useful difference as ~10 times.
50 3. If the slave requires address resolution, only protocols using
51 neighbour cache (IPv4/IPv6) will work over the equalized link.
52 Other protocols are still allowed to use the slave device directly,
53 which will not break load balancing, though native slave
54 traffic will have the highest priority. */
55
56struct teql_master
57{
58 struct Qdisc_ops qops;
59 struct net_device *dev;
60 struct Qdisc *slaves;
61 struct list_head master_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062};
63
64struct teql_sched_data
65{
66 struct Qdisc *next;
67 struct teql_master *m;
68 struct neighbour *ncache;
69 struct sk_buff_head q;
70};
71
72#define NEXT_SLAVE(q) (((struct teql_sched_data*)qdisc_priv(q))->next)
73
Roel Kluincc8fd142008-01-31 17:08:47 -080074#define FMASK (IFF_BROADCAST|IFF_POINTOPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76/* "teql*" qdisc routines */
77
78static int
79teql_enqueue(struct sk_buff *skb, struct Qdisc* sch)
80{
David S. Miller5ce2d482008-07-08 17:06:30 -070081 struct net_device *dev = qdisc_dev(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 struct teql_sched_data *q = qdisc_priv(sch);
83
Krishna Kumar4cd8c9e2007-05-08 18:57:50 -070084 if (q->q.qlen < dev->tx_queue_len) {
85 __skb_queue_tail(&q->q, skb);
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -070086 sch->bstats.bytes += qdisc_pkt_len(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 sch->bstats.packets++;
88 return 0;
89 }
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 kfree_skb(skb);
92 sch->qstats.drops++;
93 return NET_XMIT_DROP;
94}
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096static struct sk_buff *
97teql_dequeue(struct Qdisc* sch)
98{
99 struct teql_sched_data *dat = qdisc_priv(sch);
David S. Millerb0e1e642008-07-08 17:42:10 -0700100 struct netdev_queue *dat_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 struct sk_buff *skb;
102
103 skb = __skb_dequeue(&dat->q);
David S. Millere8a04642008-07-17 00:34:19 -0700104 dat_queue = netdev_get_tx_queue(dat->m->dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 if (skb == NULL) {
David S. Millerb0e1e642008-07-08 17:42:10 -0700106 struct net_device *m = qdisc_dev(dat_queue->qdisc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 if (m) {
108 dat->m->slaves = sch;
109 netif_wake_queue(m);
110 }
111 }
David S. Millerb0e1e642008-07-08 17:42:10 -0700112 sch->q.qlen = dat->q.qlen + dat_queue->qdisc->q.qlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return skb;
114}
115
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700116static struct sk_buff *
117teql_peek(struct Qdisc* sch)
118{
119 /* teql is meant to be used as root qdisc */
120 return NULL;
121}
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123static __inline__ void
124teql_neigh_release(struct neighbour *n)
125{
126 if (n)
127 neigh_release(n);
128}
129
130static void
131teql_reset(struct Qdisc* sch)
132{
133 struct teql_sched_data *dat = qdisc_priv(sch);
134
135 skb_queue_purge(&dat->q);
136 sch->q.qlen = 0;
137 teql_neigh_release(xchg(&dat->ncache, NULL));
138}
139
140static void
141teql_destroy(struct Qdisc* sch)
142{
143 struct Qdisc *q, *prev;
144 struct teql_sched_data *dat = qdisc_priv(sch);
145 struct teql_master *master = dat->m;
146
147 if ((prev = master->slaves) != NULL) {
148 do {
149 q = NEXT_SLAVE(prev);
150 if (q == sch) {
151 NEXT_SLAVE(prev) = NEXT_SLAVE(q);
152 if (q == master->slaves) {
153 master->slaves = NEXT_SLAVE(q);
154 if (q == master->slaves) {
David S. Millere8a04642008-07-17 00:34:19 -0700155 struct netdev_queue *txq;
David S. Miller83874002008-07-17 00:53:03 -0700156 spinlock_t *root_lock;
David S. Millere8a04642008-07-17 00:34:19 -0700157
158 txq = netdev_get_tx_queue(master->dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 master->slaves = NULL;
David S. Miller83874002008-07-17 00:53:03 -0700160
Jarek Poplawski102396a2008-08-29 14:21:52 -0700161 root_lock = qdisc_root_sleeping_lock(txq->qdisc);
David S. Miller83874002008-07-17 00:53:03 -0700162 spin_lock_bh(root_lock);
David S. Millere8a04642008-07-17 00:34:19 -0700163 qdisc_reset(txq->qdisc);
David S. Miller83874002008-07-17 00:53:03 -0700164 spin_unlock_bh(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
166 }
167 skb_queue_purge(&dat->q);
168 teql_neigh_release(xchg(&dat->ncache, NULL));
169 break;
170 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 } while ((prev = q) != master->slaves);
173 }
174}
175
Patrick McHardy1e904742008-01-22 22:11:17 -0800176static int teql_qdisc_init(struct Qdisc *sch, struct nlattr *opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
David S. Miller5ce2d482008-07-08 17:06:30 -0700178 struct net_device *dev = qdisc_dev(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 struct teql_master *m = (struct teql_master*)sch->ops;
180 struct teql_sched_data *q = qdisc_priv(sch);
181
182 if (dev->hard_header_len > m->dev->hard_header_len)
183 return -EINVAL;
184
185 if (m->dev == dev)
186 return -ELOOP;
187
188 q->m = m;
189
190 skb_queue_head_init(&q->q);
191
192 if (m->slaves) {
193 if (m->dev->flags & IFF_UP) {
Joe Perchesf64f9e72009-11-29 16:55:45 -0800194 if ((m->dev->flags & IFF_POINTOPOINT &&
195 !(dev->flags & IFF_POINTOPOINT)) ||
196 (m->dev->flags & IFF_BROADCAST &&
197 !(dev->flags & IFF_BROADCAST)) ||
198 (m->dev->flags & IFF_MULTICAST &&
199 !(dev->flags & IFF_MULTICAST)) ||
200 dev->mtu < m->dev->mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 return -EINVAL;
202 } else {
203 if (!(dev->flags&IFF_POINTOPOINT))
204 m->dev->flags &= ~IFF_POINTOPOINT;
205 if (!(dev->flags&IFF_BROADCAST))
206 m->dev->flags &= ~IFF_BROADCAST;
207 if (!(dev->flags&IFF_MULTICAST))
208 m->dev->flags &= ~IFF_MULTICAST;
209 if (dev->mtu < m->dev->mtu)
210 m->dev->mtu = dev->mtu;
211 }
212 q->next = NEXT_SLAVE(m->slaves);
213 NEXT_SLAVE(m->slaves) = sch;
214 } else {
215 q->next = sch;
216 m->slaves = sch;
217 m->dev->mtu = dev->mtu;
218 m->dev->flags = (m->dev->flags&~FMASK)|(dev->flags&FMASK);
219 }
220 return 0;
221}
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224static int
225__teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *dev)
226{
David S. Millere8a04642008-07-17 00:34:19 -0700227 struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, 0);
228 struct teql_sched_data *q = qdisc_priv(dev_queue->qdisc);
Eric Dumazetadf30902009-06-02 05:19:30 +0000229 struct neighbour *mn = skb_dst(skb)->neighbour;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 struct neighbour *n = q->ncache;
231
232 if (mn->tbl == NULL)
233 return -EINVAL;
234 if (n && n->tbl == mn->tbl &&
235 memcmp(n->primary_key, mn->primary_key, mn->tbl->key_len) == 0) {
236 atomic_inc(&n->refcnt);
237 } else {
238 n = __neigh_lookup_errno(mn->tbl, mn->primary_key, dev);
239 if (IS_ERR(n))
240 return PTR_ERR(n);
241 }
242 if (neigh_event_send(n, skb_res) == 0) {
243 int err;
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 read_lock(&n->lock);
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700246 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
247 n->ha, NULL, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 read_unlock(&n->lock);
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (err < 0) {
251 neigh_release(n);
252 return -EINVAL;
253 }
254 teql_neigh_release(xchg(&q->ncache, n));
255 return 0;
256 }
257 neigh_release(n);
258 return (skb_res == NULL) ? -EAGAIN : 1;
259}
260
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700261static inline int teql_resolve(struct sk_buff *skb,
262 struct sk_buff *skb_res, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
David S. Millere8a04642008-07-17 00:34:19 -0700264 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
265 if (txq->qdisc == &noop_qdisc)
Evgeniy Polyakov4f9f8312007-11-06 03:08:09 -0800266 return -ENODEV;
267
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700268 if (dev->header_ops == NULL ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000269 skb_dst(skb) == NULL ||
270 skb_dst(skb)->neighbour == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return 0;
272 return __teql_resolve(skb, skb_res, dev);
273}
274
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000275static netdev_tx_t teql_master_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
Patrick McHardy2941a482006-01-08 22:05:26 -0800277 struct teql_master *master = netdev_priv(dev);
Eric Dumazetab35cd42009-05-19 15:16:34 -0700278 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 struct Qdisc *start, *q;
280 int busy;
281 int nores;
Pavel Emelyanov4e3ab472007-10-21 17:01:29 -0700282 int subq = skb_get_queue_mapping(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 struct sk_buff *skb_res = NULL;
284
285 start = master->slaves;
286
287restart:
288 nores = 0;
289 busy = 0;
290
291 if ((q = start) == NULL)
292 goto drop;
293
294 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700295 struct net_device *slave = qdisc_dev(q);
Stephen Hemminger61294e22009-01-06 10:45:57 -0800296 struct netdev_queue *slave_txq = netdev_get_tx_queue(slave, 0);
297 const struct net_device_ops *slave_ops = slave->netdev_ops;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900298
David S. Millere8a04642008-07-17 00:34:19 -0700299 if (slave_txq->qdisc_sleeping != q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 continue;
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700301 if (__netif_subqueue_stopped(slave, subq) ||
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -0700302 !netif_running(slave)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 busy = 1;
304 continue;
305 }
306
307 switch (teql_resolve(skb, skb_res, slave)) {
308 case 0:
David S. Millerc3f26a22008-07-31 16:58:50 -0700309 if (__netif_tx_trylock(slave_txq)) {
Eric Dumazetc0f84d02009-05-18 15:12:31 -0700310 unsigned int length = qdisc_pkt_len(skb);
311
David S. Millerc3f26a22008-07-31 16:58:50 -0700312 if (!netif_tx_queue_stopped(slave_txq) &&
313 !netif_tx_queue_frozen(slave_txq) &&
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000314 slave_ops->ndo_start_xmit(skb, slave) == NETDEV_TX_OK) {
Eric Dumazet08baf562009-05-25 22:58:01 -0700315 txq_trans_update(slave_txq);
David S. Millerc3f26a22008-07-31 16:58:50 -0700316 __netif_tx_unlock(slave_txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 master->slaves = NEXT_SLAVE(q);
318 netif_wake_queue(dev);
Eric Dumazetab35cd42009-05-19 15:16:34 -0700319 txq->tx_packets++;
320 txq->tx_bytes += length;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000321 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
David S. Millerc3f26a22008-07-31 16:58:50 -0700323 __netif_tx_unlock(slave_txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 }
325 if (netif_queue_stopped(dev))
326 busy = 1;
327 break;
328 case 1:
329 master->slaves = NEXT_SLAVE(q);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000330 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 default:
332 nores = 1;
333 break;
334 }
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300335 __skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 } while ((q = NEXT_SLAVE(q)) != start);
337
338 if (nores && skb_res == NULL) {
339 skb_res = skb;
340 goto restart;
341 }
342
343 if (busy) {
344 netif_stop_queue(dev);
Patrick McHardy5b548142009-06-12 06:22:29 +0000345 return NETDEV_TX_BUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
Eric Dumazetab35cd42009-05-19 15:16:34 -0700347 dev->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349drop:
Eric Dumazetab35cd42009-05-19 15:16:34 -0700350 txq->tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000352 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353}
354
355static int teql_master_open(struct net_device *dev)
356{
357 struct Qdisc * q;
Patrick McHardy2941a482006-01-08 22:05:26 -0800358 struct teql_master *m = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 int mtu = 0xFFFE;
360 unsigned flags = IFF_NOARP|IFF_MULTICAST;
361
362 if (m->slaves == NULL)
363 return -EUNATCH;
364
365 flags = FMASK;
366
367 q = m->slaves;
368 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700369 struct net_device *slave = qdisc_dev(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
371 if (slave == NULL)
372 return -EUNATCH;
373
374 if (slave->mtu < mtu)
375 mtu = slave->mtu;
376 if (slave->hard_header_len > LL_MAX_HEADER)
377 return -EINVAL;
378
379 /* If all the slaves are BROADCAST, master is BROADCAST
380 If all the slaves are PtP, master is PtP
381 Otherwise, master is NBMA.
382 */
383 if (!(slave->flags&IFF_POINTOPOINT))
384 flags &= ~IFF_POINTOPOINT;
385 if (!(slave->flags&IFF_BROADCAST))
386 flags &= ~IFF_BROADCAST;
387 if (!(slave->flags&IFF_MULTICAST))
388 flags &= ~IFF_MULTICAST;
389 } while ((q = NEXT_SLAVE(q)) != m->slaves);
390
391 m->dev->mtu = mtu;
392 m->dev->flags = (m->dev->flags&~FMASK) | flags;
393 netif_start_queue(m->dev);
394 return 0;
395}
396
397static int teql_master_close(struct net_device *dev)
398{
399 netif_stop_queue(dev);
400 return 0;
401}
402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403static int teql_master_mtu(struct net_device *dev, int new_mtu)
404{
Patrick McHardy2941a482006-01-08 22:05:26 -0800405 struct teql_master *m = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 struct Qdisc *q;
407
408 if (new_mtu < 68)
409 return -EINVAL;
410
411 q = m->slaves;
412 if (q) {
413 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700414 if (new_mtu > qdisc_dev(q)->mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return -EINVAL;
416 } while ((q=NEXT_SLAVE(q)) != m->slaves);
417 }
418
419 dev->mtu = new_mtu;
420 return 0;
421}
422
Stephen Hemminger61294e22009-01-06 10:45:57 -0800423static const struct net_device_ops teql_netdev_ops = {
424 .ndo_open = teql_master_open,
425 .ndo_stop = teql_master_close,
426 .ndo_start_xmit = teql_master_xmit,
Stephen Hemminger61294e22009-01-06 10:45:57 -0800427 .ndo_change_mtu = teql_master_mtu,
428};
429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430static __init void teql_master_setup(struct net_device *dev)
431{
Patrick McHardy2941a482006-01-08 22:05:26 -0800432 struct teql_master *master = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 struct Qdisc_ops *ops = &master->qops;
434
435 master->dev = dev;
436 ops->priv_size = sizeof(struct teql_sched_data);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 ops->enqueue = teql_enqueue;
439 ops->dequeue = teql_dequeue;
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700440 ops->peek = teql_peek;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 ops->init = teql_qdisc_init;
442 ops->reset = teql_reset;
443 ops->destroy = teql_destroy;
444 ops->owner = THIS_MODULE;
445
Stephen Hemminger61294e22009-01-06 10:45:57 -0800446 dev->netdev_ops = &teql_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 dev->type = ARPHRD_VOID;
448 dev->mtu = 1500;
449 dev->tx_queue_len = 100;
450 dev->flags = IFF_NOARP;
451 dev->hard_header_len = LL_MAX_HEADER;
Tom Hughesfa68a782010-06-15 22:24:28 +0000452 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453}
454
455static LIST_HEAD(master_dev_list);
456static int max_equalizers = 1;
457module_param(max_equalizers, int, 0);
458MODULE_PARM_DESC(max_equalizers, "Max number of link equalizers");
459
460static int __init teql_init(void)
461{
462 int i;
463 int err = -ENODEV;
464
465 for (i = 0; i < max_equalizers; i++) {
466 struct net_device *dev;
467 struct teql_master *master;
468
469 dev = alloc_netdev(sizeof(struct teql_master),
470 "teql%d", teql_master_setup);
471 if (!dev) {
472 err = -ENOMEM;
473 break;
474 }
475
476 if ((err = register_netdev(dev))) {
477 free_netdev(dev);
478 break;
479 }
480
Patrick McHardy2941a482006-01-08 22:05:26 -0800481 master = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 strlcpy(master->qops.id, dev->name, IFNAMSIZ);
484 err = register_qdisc(&master->qops);
485
486 if (err) {
487 unregister_netdev(dev);
488 free_netdev(dev);
489 break;
490 }
491
492 list_add_tail(&master->master_list, &master_dev_list);
493 }
494 return i ? 0 : err;
495}
496
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900497static void __exit teql_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498{
499 struct teql_master *master, *nxt;
500
501 list_for_each_entry_safe(master, nxt, &master_dev_list, master_list) {
502
503 list_del(&master->master_list);
504
505 unregister_qdisc(&master->qops);
506 unregister_netdev(master->dev);
507 free_netdev(master->dev);
508 }
509}
510
511module_init(teql_init);
512module_exit(teql_exit);
513
514MODULE_LICENSE("GPL");