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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
Eric Dumazetcc7ec452011-01-19 19:26:56 +000056struct teql_master {
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 struct Qdisc_ops qops;
58 struct net_device *dev;
59 struct Qdisc *slaves;
60 struct list_head master_list;
Eric Dumazet1ac9ad12011-01-12 12:13:14 +000061 unsigned long tx_bytes;
62 unsigned long tx_packets;
63 unsigned long tx_errors;
64 unsigned long tx_dropped;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
66
Eric Dumazetcc7ec452011-01-19 19:26:56 +000067struct teql_sched_data {
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 struct Qdisc *next;
69 struct teql_master *m;
70 struct neighbour *ncache;
71 struct sk_buff_head q;
72};
73
Eric Dumazetcc7ec452011-01-19 19:26:56 +000074#define NEXT_SLAVE(q) (((struct teql_sched_data *)qdisc_priv(q))->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Eric Dumazetcc7ec452011-01-19 19:26:56 +000076#define FMASK (IFF_BROADCAST | IFF_POINTOPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78/* "teql*" qdisc routines */
79
80static int
Eric Dumazetcc7ec452011-01-19 19:26:56 +000081teql_enqueue(struct sk_buff *skb, struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
David S. Miller5ce2d482008-07-08 17:06:30 -070083 struct net_device *dev = qdisc_dev(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 struct teql_sched_data *q = qdisc_priv(sch);
85
Krishna Kumar4cd8c9e2007-05-08 18:57:50 -070086 if (q->q.qlen < dev->tx_queue_len) {
87 __skb_queue_tail(&q->q, skb);
Ben Greear9871e502010-08-10 01:45:40 -070088 return NET_XMIT_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 }
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 *
Eric Dumazetcc7ec452011-01-19 19:26:56 +000097teql_dequeue(struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
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 }
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800111 } else {
112 qdisc_bstats_update(sch, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 }
David S. Millerb0e1e642008-07-08 17:42:10 -0700114 sch->q.qlen = dat->q.qlen + dat_queue->qdisc->q.qlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return skb;
116}
117
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700118static struct sk_buff *
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000119teql_peek(struct Qdisc *sch)
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700120{
121 /* teql is meant to be used as root qdisc */
122 return NULL;
123}
124
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000125static inline void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126teql_neigh_release(struct neighbour *n)
127{
128 if (n)
129 neigh_release(n);
130}
131
132static void
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000133teql_reset(struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
135 struct teql_sched_data *dat = qdisc_priv(sch);
136
137 skb_queue_purge(&dat->q);
138 sch->q.qlen = 0;
139 teql_neigh_release(xchg(&dat->ncache, NULL));
140}
141
142static void
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000143teql_destroy(struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
145 struct Qdisc *q, *prev;
146 struct teql_sched_data *dat = qdisc_priv(sch);
147 struct teql_master *master = dat->m;
148
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000149 prev = master->slaves;
150 if (prev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 do {
152 q = NEXT_SLAVE(prev);
153 if (q == sch) {
154 NEXT_SLAVE(prev) = NEXT_SLAVE(q);
155 if (q == master->slaves) {
156 master->slaves = NEXT_SLAVE(q);
157 if (q == master->slaves) {
David S. Millere8a04642008-07-17 00:34:19 -0700158 struct netdev_queue *txq;
David S. Miller83874002008-07-17 00:53:03 -0700159 spinlock_t *root_lock;
David S. Millere8a04642008-07-17 00:34:19 -0700160
161 txq = netdev_get_tx_queue(master->dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 master->slaves = NULL;
David S. Miller83874002008-07-17 00:53:03 -0700163
Jarek Poplawski102396a2008-08-29 14:21:52 -0700164 root_lock = qdisc_root_sleeping_lock(txq->qdisc);
David S. Miller83874002008-07-17 00:53:03 -0700165 spin_lock_bh(root_lock);
David S. Millere8a04642008-07-17 00:34:19 -0700166 qdisc_reset(txq->qdisc);
David S. Miller83874002008-07-17 00:53:03 -0700167 spin_unlock_bh(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
169 }
170 skb_queue_purge(&dat->q);
171 teql_neigh_release(xchg(&dat->ncache, NULL));
172 break;
173 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 } while ((prev = q) != master->slaves);
176 }
177}
178
Patrick McHardy1e904742008-01-22 22:11:17 -0800179static int teql_qdisc_init(struct Qdisc *sch, struct nlattr *opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
David S. Miller5ce2d482008-07-08 17:06:30 -0700181 struct net_device *dev = qdisc_dev(sch);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000182 struct teql_master *m = (struct teql_master *)sch->ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 struct teql_sched_data *q = qdisc_priv(sch);
184
185 if (dev->hard_header_len > m->dev->hard_header_len)
186 return -EINVAL;
187
188 if (m->dev == dev)
189 return -ELOOP;
190
191 q->m = m;
192
193 skb_queue_head_init(&q->q);
194
195 if (m->slaves) {
196 if (m->dev->flags & IFF_UP) {
Joe Perchesf64f9e72009-11-29 16:55:45 -0800197 if ((m->dev->flags & IFF_POINTOPOINT &&
198 !(dev->flags & IFF_POINTOPOINT)) ||
199 (m->dev->flags & IFF_BROADCAST &&
200 !(dev->flags & IFF_BROADCAST)) ||
201 (m->dev->flags & IFF_MULTICAST &&
202 !(dev->flags & IFF_MULTICAST)) ||
203 dev->mtu < m->dev->mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 return -EINVAL;
205 } else {
206 if (!(dev->flags&IFF_POINTOPOINT))
207 m->dev->flags &= ~IFF_POINTOPOINT;
208 if (!(dev->flags&IFF_BROADCAST))
209 m->dev->flags &= ~IFF_BROADCAST;
210 if (!(dev->flags&IFF_MULTICAST))
211 m->dev->flags &= ~IFF_MULTICAST;
212 if (dev->mtu < m->dev->mtu)
213 m->dev->mtu = dev->mtu;
214 }
215 q->next = NEXT_SLAVE(m->slaves);
216 NEXT_SLAVE(m->slaves) = sch;
217 } else {
218 q->next = sch;
219 m->slaves = sch;
220 m->dev->mtu = dev->mtu;
221 m->dev->flags = (m->dev->flags&~FMASK)|(dev->flags&FMASK);
222 }
223 return 0;
224}
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227static int
228__teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *dev)
229{
David S. Millere8a04642008-07-17 00:34:19 -0700230 struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, 0);
231 struct teql_sched_data *q = qdisc_priv(dev_queue->qdisc);
Eric Dumazetadf30902009-06-02 05:19:30 +0000232 struct neighbour *mn = skb_dst(skb)->neighbour;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 struct neighbour *n = q->ncache;
234
235 if (mn->tbl == NULL)
236 return -EINVAL;
237 if (n && n->tbl == mn->tbl &&
238 memcmp(n->primary_key, mn->primary_key, mn->tbl->key_len) == 0) {
239 atomic_inc(&n->refcnt);
240 } else {
241 n = __neigh_lookup_errno(mn->tbl, mn->primary_key, dev);
242 if (IS_ERR(n))
243 return PTR_ERR(n);
244 }
245 if (neigh_event_send(n, skb_res) == 0) {
246 int err;
Eric Dumazet0ed8ddf2010-10-07 10:44:07 +0000247 char haddr[MAX_ADDR_LEN];
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700248
Eric Dumazet0ed8ddf2010-10-07 10:44:07 +0000249 neigh_ha_snapshot(haddr, n, dev);
250 err = dev_hard_header(skb, dev, ntohs(skb->protocol), haddr,
251 NULL, skb->len);
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 if (err < 0) {
254 neigh_release(n);
255 return -EINVAL;
256 }
257 teql_neigh_release(xchg(&q->ncache, n));
258 return 0;
259 }
260 neigh_release(n);
261 return (skb_res == NULL) ? -EAGAIN : 1;
262}
263
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700264static inline int teql_resolve(struct sk_buff *skb,
265 struct sk_buff *skb_res, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
David S. Millere8a04642008-07-17 00:34:19 -0700267 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
268 if (txq->qdisc == &noop_qdisc)
Evgeniy Polyakov4f9f8312007-11-06 03:08:09 -0800269 return -ENODEV;
270
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700271 if (dev->header_ops == NULL ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000272 skb_dst(skb) == NULL ||
273 skb_dst(skb)->neighbour == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 return 0;
275 return __teql_resolve(skb, skb_res, dev);
276}
277
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000278static netdev_tx_t teql_master_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279{
Patrick McHardy2941a482006-01-08 22:05:26 -0800280 struct teql_master *master = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 struct Qdisc *start, *q;
282 int busy;
283 int nores;
Pavel Emelyanov4e3ab472007-10-21 17:01:29 -0700284 int subq = skb_get_queue_mapping(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 struct sk_buff *skb_res = NULL;
286
287 start = master->slaves;
288
289restart:
290 nores = 0;
291 busy = 0;
292
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000293 q = start;
294 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 goto drop;
296
297 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700298 struct net_device *slave = qdisc_dev(q);
Stephen Hemminger61294e22009-01-06 10:45:57 -0800299 struct netdev_queue *slave_txq = netdev_get_tx_queue(slave, 0);
300 const struct net_device_ops *slave_ops = slave->netdev_ops;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900301
David S. Millere8a04642008-07-17 00:34:19 -0700302 if (slave_txq->qdisc_sleeping != q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 continue;
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700304 if (__netif_subqueue_stopped(slave, subq) ||
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -0700305 !netif_running(slave)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 busy = 1;
307 continue;
308 }
309
310 switch (teql_resolve(skb, skb_res, slave)) {
311 case 0:
David S. Millerc3f26a22008-07-31 16:58:50 -0700312 if (__netif_tx_trylock(slave_txq)) {
Eric Dumazetc0f84d02009-05-18 15:12:31 -0700313 unsigned int length = qdisc_pkt_len(skb);
314
Eric Dumazet5a0d2262010-11-23 10:42:02 +0000315 if (!netif_tx_queue_frozen_or_stopped(slave_txq) &&
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000316 slave_ops->ndo_start_xmit(skb, slave) == NETDEV_TX_OK) {
Eric Dumazet08baf562009-05-25 22:58:01 -0700317 txq_trans_update(slave_txq);
David S. Millerc3f26a22008-07-31 16:58:50 -0700318 __netif_tx_unlock(slave_txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 master->slaves = NEXT_SLAVE(q);
320 netif_wake_queue(dev);
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000321 master->tx_packets++;
322 master->tx_bytes += length;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000323 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 }
David S. Millerc3f26a22008-07-31 16:58:50 -0700325 __netif_tx_unlock(slave_txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327 if (netif_queue_stopped(dev))
328 busy = 1;
329 break;
330 case 1:
331 master->slaves = NEXT_SLAVE(q);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000332 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 default:
334 nores = 1;
335 break;
336 }
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300337 __skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 } while ((q = NEXT_SLAVE(q)) != start);
339
340 if (nores && skb_res == NULL) {
341 skb_res = skb;
342 goto restart;
343 }
344
345 if (busy) {
346 netif_stop_queue(dev);
Patrick McHardy5b548142009-06-12 06:22:29 +0000347 return NETDEV_TX_BUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 }
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000349 master->tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351drop:
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000352 master->tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000354 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355}
356
357static int teql_master_open(struct net_device *dev)
358{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000359 struct Qdisc *q;
Patrick McHardy2941a482006-01-08 22:05:26 -0800360 struct teql_master *m = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 int mtu = 0xFFFE;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000362 unsigned int flags = IFF_NOARP | IFF_MULTICAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
364 if (m->slaves == NULL)
365 return -EUNATCH;
366
367 flags = FMASK;
368
369 q = m->slaves;
370 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700371 struct net_device *slave = qdisc_dev(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
373 if (slave == NULL)
374 return -EUNATCH;
375
376 if (slave->mtu < mtu)
377 mtu = slave->mtu;
378 if (slave->hard_header_len > LL_MAX_HEADER)
379 return -EINVAL;
380
381 /* If all the slaves are BROADCAST, master is BROADCAST
382 If all the slaves are PtP, master is PtP
383 Otherwise, master is NBMA.
384 */
385 if (!(slave->flags&IFF_POINTOPOINT))
386 flags &= ~IFF_POINTOPOINT;
387 if (!(slave->flags&IFF_BROADCAST))
388 flags &= ~IFF_BROADCAST;
389 if (!(slave->flags&IFF_MULTICAST))
390 flags &= ~IFF_MULTICAST;
391 } while ((q = NEXT_SLAVE(q)) != m->slaves);
392
393 m->dev->mtu = mtu;
394 m->dev->flags = (m->dev->flags&~FMASK) | flags;
395 netif_start_queue(m->dev);
396 return 0;
397}
398
399static int teql_master_close(struct net_device *dev)
400{
401 netif_stop_queue(dev);
402 return 0;
403}
404
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000405static struct rtnl_link_stats64 *teql_master_stats64(struct net_device *dev,
406 struct rtnl_link_stats64 *stats)
407{
408 struct teql_master *m = netdev_priv(dev);
409
410 stats->tx_packets = m->tx_packets;
411 stats->tx_bytes = m->tx_bytes;
412 stats->tx_errors = m->tx_errors;
413 stats->tx_dropped = m->tx_dropped;
414 return stats;
415}
416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417static int teql_master_mtu(struct net_device *dev, int new_mtu)
418{
Patrick McHardy2941a482006-01-08 22:05:26 -0800419 struct teql_master *m = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 struct Qdisc *q;
421
422 if (new_mtu < 68)
423 return -EINVAL;
424
425 q = m->slaves;
426 if (q) {
427 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700428 if (new_mtu > qdisc_dev(q)->mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 return -EINVAL;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000430 } while ((q = NEXT_SLAVE(q)) != m->slaves);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 }
432
433 dev->mtu = new_mtu;
434 return 0;
435}
436
Stephen Hemminger61294e22009-01-06 10:45:57 -0800437static const struct net_device_ops teql_netdev_ops = {
438 .ndo_open = teql_master_open,
439 .ndo_stop = teql_master_close,
440 .ndo_start_xmit = teql_master_xmit,
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000441 .ndo_get_stats64 = teql_master_stats64,
Stephen Hemminger61294e22009-01-06 10:45:57 -0800442 .ndo_change_mtu = teql_master_mtu,
443};
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445static __init void teql_master_setup(struct net_device *dev)
446{
Patrick McHardy2941a482006-01-08 22:05:26 -0800447 struct teql_master *master = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 struct Qdisc_ops *ops = &master->qops;
449
450 master->dev = dev;
451 ops->priv_size = sizeof(struct teql_sched_data);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 ops->enqueue = teql_enqueue;
454 ops->dequeue = teql_dequeue;
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700455 ops->peek = teql_peek;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 ops->init = teql_qdisc_init;
457 ops->reset = teql_reset;
458 ops->destroy = teql_destroy;
459 ops->owner = THIS_MODULE;
460
Stephen Hemminger61294e22009-01-06 10:45:57 -0800461 dev->netdev_ops = &teql_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 dev->type = ARPHRD_VOID;
463 dev->mtu = 1500;
464 dev->tx_queue_len = 100;
465 dev->flags = IFF_NOARP;
466 dev->hard_header_len = LL_MAX_HEADER;
Tom Hughesfa68a782010-06-15 22:24:28 +0000467 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468}
469
470static LIST_HEAD(master_dev_list);
471static int max_equalizers = 1;
472module_param(max_equalizers, int, 0);
473MODULE_PARM_DESC(max_equalizers, "Max number of link equalizers");
474
475static int __init teql_init(void)
476{
477 int i;
478 int err = -ENODEV;
479
480 for (i = 0; i < max_equalizers; i++) {
481 struct net_device *dev;
482 struct teql_master *master;
483
484 dev = alloc_netdev(sizeof(struct teql_master),
485 "teql%d", teql_master_setup);
486 if (!dev) {
487 err = -ENOMEM;
488 break;
489 }
490
491 if ((err = register_netdev(dev))) {
492 free_netdev(dev);
493 break;
494 }
495
Patrick McHardy2941a482006-01-08 22:05:26 -0800496 master = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
498 strlcpy(master->qops.id, dev->name, IFNAMSIZ);
499 err = register_qdisc(&master->qops);
500
501 if (err) {
502 unregister_netdev(dev);
503 free_netdev(dev);
504 break;
505 }
506
507 list_add_tail(&master->master_list, &master_dev_list);
508 }
509 return i ? 0 : err;
510}
511
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900512static void __exit teql_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
514 struct teql_master *master, *nxt;
515
516 list_for_each_entry_safe(master, nxt, &master_dev_list, master_list) {
517
518 list_del(&master->master_list);
519
520 unregister_qdisc(&master->qops);
521 unregister_netdev(master->dev);
522 free_netdev(master->dev);
523 }
524}
525
526module_init(teql_init);
527module_exit(teql_exit);
528
529MODULE_LICENSE("GPL");