blob: 45326599fda37786e7ac2104e77bbd1bfa2b5083 [file] [log] [blame]
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
Eric Dumazetf7e57042011-11-30 04:08:58 +0000228__teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res,
229 struct net_device *dev, struct netdev_queue *txq,
230 struct neighbour *mn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
Eric Dumazetf7e57042011-11-30 04:08:58 +0000232 struct teql_sched_data *q = qdisc_priv(txq->qdisc);
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,
Eric Dumazetf7e57042011-11-30 04:08:58 +0000265 struct sk_buff *skb_res,
266 struct net_device *dev,
267 struct netdev_queue *txq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
Eric Dumazetf7e57042011-11-30 04:08:58 +0000269 struct dst_entry *dst = skb_dst(skb);
270 struct neighbour *mn;
271 int res;
272
David S. Millere8a04642008-07-17 00:34:19 -0700273 if (txq->qdisc == &noop_qdisc)
Evgeniy Polyakov4f9f8312007-11-06 03:08:09 -0800274 return -ENODEV;
275
Eric Dumazetf7e57042011-11-30 04:08:58 +0000276 if (!dev->header_ops || !dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return 0;
Eric Dumazetf7e57042011-11-30 04:08:58 +0000278
279 rcu_read_lock();
David Miller27217452011-12-02 16:52:08 +0000280 mn = dst_get_neighbour_noref(dst);
Eric Dumazetf7e57042011-11-30 04:08:58 +0000281 res = mn ? __teql_resolve(skb, skb_res, dev, txq, mn) : 0;
282 rcu_read_unlock();
283
284 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285}
286
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000287static netdev_tx_t teql_master_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Patrick McHardy2941a482006-01-08 22:05:26 -0800289 struct teql_master *master = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 struct Qdisc *start, *q;
291 int busy;
292 int nores;
Pavel Emelyanov4e3ab472007-10-21 17:01:29 -0700293 int subq = skb_get_queue_mapping(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 struct sk_buff *skb_res = NULL;
295
296 start = master->slaves;
297
298restart:
299 nores = 0;
300 busy = 0;
301
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000302 q = start;
303 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 goto drop;
305
306 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700307 struct net_device *slave = qdisc_dev(q);
Stephen Hemminger61294e22009-01-06 10:45:57 -0800308 struct netdev_queue *slave_txq = netdev_get_tx_queue(slave, 0);
309 const struct net_device_ops *slave_ops = slave->netdev_ops;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900310
David S. Millere8a04642008-07-17 00:34:19 -0700311 if (slave_txq->qdisc_sleeping != q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 continue;
Tom Herbert734664982011-11-28 16:32:44 +0000313 if (netif_xmit_stopped(netdev_get_tx_queue(slave, subq)) ||
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -0700314 !netif_running(slave)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 busy = 1;
316 continue;
317 }
318
Eric Dumazetf7e57042011-11-30 04:08:58 +0000319 switch (teql_resolve(skb, skb_res, slave, slave_txq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 case 0:
David S. Millerc3f26a22008-07-31 16:58:50 -0700321 if (__netif_tx_trylock(slave_txq)) {
Eric Dumazetc0f84d02009-05-18 15:12:31 -0700322 unsigned int length = qdisc_pkt_len(skb);
323
Tom Herbert734664982011-11-28 16:32:44 +0000324 if (!netif_xmit_frozen_or_stopped(slave_txq) &&
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000325 slave_ops->ndo_start_xmit(skb, slave) == NETDEV_TX_OK) {
Eric Dumazet08baf562009-05-25 22:58:01 -0700326 txq_trans_update(slave_txq);
David S. Millerc3f26a22008-07-31 16:58:50 -0700327 __netif_tx_unlock(slave_txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 master->slaves = NEXT_SLAVE(q);
329 netif_wake_queue(dev);
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000330 master->tx_packets++;
331 master->tx_bytes += length;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000332 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 }
David S. Millerc3f26a22008-07-31 16:58:50 -0700334 __netif_tx_unlock(slave_txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 }
Tom Herbert734664982011-11-28 16:32:44 +0000336 if (netif_xmit_stopped(netdev_get_tx_queue(dev, 0)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 busy = 1;
338 break;
339 case 1:
340 master->slaves = NEXT_SLAVE(q);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000341 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 default:
343 nores = 1;
344 break;
345 }
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300346 __skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 } while ((q = NEXT_SLAVE(q)) != start);
348
349 if (nores && skb_res == NULL) {
350 skb_res = skb;
351 goto restart;
352 }
353
354 if (busy) {
355 netif_stop_queue(dev);
Patrick McHardy5b548142009-06-12 06:22:29 +0000356 return NETDEV_TX_BUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000358 master->tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
360drop:
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000361 master->tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000363 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364}
365
366static int teql_master_open(struct net_device *dev)
367{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000368 struct Qdisc *q;
Patrick McHardy2941a482006-01-08 22:05:26 -0800369 struct teql_master *m = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 int mtu = 0xFFFE;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000371 unsigned int flags = IFF_NOARP | IFF_MULTICAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
373 if (m->slaves == NULL)
374 return -EUNATCH;
375
376 flags = FMASK;
377
378 q = m->slaves;
379 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700380 struct net_device *slave = qdisc_dev(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382 if (slave == NULL)
383 return -EUNATCH;
384
385 if (slave->mtu < mtu)
386 mtu = slave->mtu;
387 if (slave->hard_header_len > LL_MAX_HEADER)
388 return -EINVAL;
389
390 /* If all the slaves are BROADCAST, master is BROADCAST
391 If all the slaves are PtP, master is PtP
392 Otherwise, master is NBMA.
393 */
394 if (!(slave->flags&IFF_POINTOPOINT))
395 flags &= ~IFF_POINTOPOINT;
396 if (!(slave->flags&IFF_BROADCAST))
397 flags &= ~IFF_BROADCAST;
398 if (!(slave->flags&IFF_MULTICAST))
399 flags &= ~IFF_MULTICAST;
400 } while ((q = NEXT_SLAVE(q)) != m->slaves);
401
402 m->dev->mtu = mtu;
403 m->dev->flags = (m->dev->flags&~FMASK) | flags;
404 netif_start_queue(m->dev);
405 return 0;
406}
407
408static int teql_master_close(struct net_device *dev)
409{
410 netif_stop_queue(dev);
411 return 0;
412}
413
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000414static struct rtnl_link_stats64 *teql_master_stats64(struct net_device *dev,
415 struct rtnl_link_stats64 *stats)
416{
417 struct teql_master *m = netdev_priv(dev);
418
419 stats->tx_packets = m->tx_packets;
420 stats->tx_bytes = m->tx_bytes;
421 stats->tx_errors = m->tx_errors;
422 stats->tx_dropped = m->tx_dropped;
423 return stats;
424}
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426static int teql_master_mtu(struct net_device *dev, int new_mtu)
427{
Patrick McHardy2941a482006-01-08 22:05:26 -0800428 struct teql_master *m = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 struct Qdisc *q;
430
431 if (new_mtu < 68)
432 return -EINVAL;
433
434 q = m->slaves;
435 if (q) {
436 do {
David S. Miller5ce2d482008-07-08 17:06:30 -0700437 if (new_mtu > qdisc_dev(q)->mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 return -EINVAL;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000439 } while ((q = NEXT_SLAVE(q)) != m->slaves);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 }
441
442 dev->mtu = new_mtu;
443 return 0;
444}
445
Stephen Hemminger61294e22009-01-06 10:45:57 -0800446static const struct net_device_ops teql_netdev_ops = {
447 .ndo_open = teql_master_open,
448 .ndo_stop = teql_master_close,
449 .ndo_start_xmit = teql_master_xmit,
Eric Dumazet1ac9ad12011-01-12 12:13:14 +0000450 .ndo_get_stats64 = teql_master_stats64,
Stephen Hemminger61294e22009-01-06 10:45:57 -0800451 .ndo_change_mtu = teql_master_mtu,
452};
453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454static __init void teql_master_setup(struct net_device *dev)
455{
Patrick McHardy2941a482006-01-08 22:05:26 -0800456 struct teql_master *master = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 struct Qdisc_ops *ops = &master->qops;
458
459 master->dev = dev;
460 ops->priv_size = sizeof(struct teql_sched_data);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900461
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 ops->enqueue = teql_enqueue;
463 ops->dequeue = teql_dequeue;
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700464 ops->peek = teql_peek;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 ops->init = teql_qdisc_init;
466 ops->reset = teql_reset;
467 ops->destroy = teql_destroy;
468 ops->owner = THIS_MODULE;
469
Stephen Hemminger61294e22009-01-06 10:45:57 -0800470 dev->netdev_ops = &teql_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 dev->type = ARPHRD_VOID;
472 dev->mtu = 1500;
473 dev->tx_queue_len = 100;
474 dev->flags = IFF_NOARP;
475 dev->hard_header_len = LL_MAX_HEADER;
Tom Hughesfa68a782010-06-15 22:24:28 +0000476 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
479static LIST_HEAD(master_dev_list);
480static int max_equalizers = 1;
481module_param(max_equalizers, int, 0);
482MODULE_PARM_DESC(max_equalizers, "Max number of link equalizers");
483
484static int __init teql_init(void)
485{
486 int i;
487 int err = -ENODEV;
488
489 for (i = 0; i < max_equalizers; i++) {
490 struct net_device *dev;
491 struct teql_master *master;
492
493 dev = alloc_netdev(sizeof(struct teql_master),
494 "teql%d", teql_master_setup);
495 if (!dev) {
496 err = -ENOMEM;
497 break;
498 }
499
500 if ((err = register_netdev(dev))) {
501 free_netdev(dev);
502 break;
503 }
504
Patrick McHardy2941a482006-01-08 22:05:26 -0800505 master = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 strlcpy(master->qops.id, dev->name, IFNAMSIZ);
508 err = register_qdisc(&master->qops);
509
510 if (err) {
511 unregister_netdev(dev);
512 free_netdev(dev);
513 break;
514 }
515
516 list_add_tail(&master->master_list, &master_dev_list);
517 }
518 return i ? 0 : err;
519}
520
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900521static void __exit teql_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522{
523 struct teql_master *master, *nxt;
524
525 list_for_each_entry_safe(master, nxt, &master_dev_list, master_list) {
526
527 list_del(&master->master_list);
528
529 unregister_qdisc(&master->qops);
530 unregister_netdev(master->dev);
531 free_netdev(master->dev);
532 }
533}
534
535module_init(teql_init);
536module_exit(teql_exit);
537
538MODULE_LICENSE("GPL");