Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/types.h> |
| 13 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/errno.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 16 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/skbuff.h> |
| 20 | #include <linux/moduleparam.h> |
Patrick McHardy | 0ba4805 | 2007-07-02 22:49:07 -0700 | [diff] [blame] | 21 | #include <net/dst.h> |
| 22 | #include <net/neighbour.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <net/pkt_sched.h> |
| 24 | |
| 25 | /* |
| 26 | How to setup it. |
| 27 | ---------------- |
| 28 | |
| 29 | After loading this module you will find a new device teqlN |
| 30 | and new qdisc with the same name. To join a slave to the equalizer |
| 31 | you should just set this qdisc on a device f.e. |
| 32 | |
| 33 | # tc qdisc add dev eth0 root teql0 |
| 34 | # tc qdisc add dev eth1 root teql0 |
| 35 | |
| 36 | That's all. Full PnP 8) |
| 37 | |
| 38 | Applicability. |
| 39 | -------------- |
| 40 | |
| 41 | 1. Slave devices MUST be active devices, i.e., they must raise the tbusy |
| 42 | signal and generate EOI events. If you want to equalize virtual devices |
| 43 | like tunnels, use a normal eql device. |
| 44 | 2. This device puts no limitations on physical slave characteristics |
| 45 | f.e. it will equalize 9600baud line and 100Mb ethernet perfectly :-) |
| 46 | Certainly, large difference in link speeds will make the resulting |
| 47 | eqalized link unusable, because of huge packet reordering. |
| 48 | I estimate an upper useful difference as ~10 times. |
| 49 | 3. If the slave requires address resolution, only protocols using |
| 50 | neighbour cache (IPv4/IPv6) will work over the equalized link. |
| 51 | Other protocols are still allowed to use the slave device directly, |
| 52 | which will not break load balancing, though native slave |
| 53 | traffic will have the highest priority. */ |
| 54 | |
| 55 | struct teql_master |
| 56 | { |
| 57 | struct Qdisc_ops qops; |
| 58 | struct net_device *dev; |
| 59 | struct Qdisc *slaves; |
| 60 | struct list_head master_list; |
| 61 | struct net_device_stats stats; |
| 62 | }; |
| 63 | |
| 64 | struct 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 Kluin | cc8fd14 | 2008-01-31 17:08:47 -0800 | [diff] [blame] | 74 | #define FMASK (IFF_BROADCAST|IFF_POINTOPOINT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | /* "teql*" qdisc routines */ |
| 77 | |
| 78 | static int |
| 79 | teql_enqueue(struct sk_buff *skb, struct Qdisc* sch) |
| 80 | { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 81 | struct net_device *dev = qdisc_dev(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | struct teql_sched_data *q = qdisc_priv(sch); |
| 83 | |
Krishna Kumar | 4cd8c9e | 2007-05-08 18:57:50 -0700 | [diff] [blame] | 84 | if (q->q.qlen < dev->tx_queue_len) { |
| 85 | __skb_queue_tail(&q->q, skb); |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 86 | sch->bstats.bytes += qdisc_pkt_len(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | sch->bstats.packets++; |
| 88 | return 0; |
| 89 | } |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | kfree_skb(skb); |
| 92 | sch->qstats.drops++; |
| 93 | return NET_XMIT_DROP; |
| 94 | } |
| 95 | |
| 96 | static int |
| 97 | teql_requeue(struct sk_buff *skb, struct Qdisc* sch) |
| 98 | { |
| 99 | struct teql_sched_data *q = qdisc_priv(sch); |
| 100 | |
| 101 | __skb_queue_head(&q->q, skb); |
| 102 | sch->qstats.requeues++; |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | static struct sk_buff * |
| 107 | teql_dequeue(struct Qdisc* sch) |
| 108 | { |
| 109 | struct teql_sched_data *dat = qdisc_priv(sch); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 110 | struct netdev_queue *dat_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | struct sk_buff *skb; |
| 112 | |
| 113 | skb = __skb_dequeue(&dat->q); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 114 | dat_queue = netdev_get_tx_queue(dat->m->dev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | if (skb == NULL) { |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 116 | struct net_device *m = qdisc_dev(dat_queue->qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | if (m) { |
| 118 | dat->m->slaves = sch; |
| 119 | netif_wake_queue(m); |
| 120 | } |
| 121 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 122 | sch->q.qlen = dat->q.qlen + dat_queue->qdisc->q.qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | return skb; |
| 124 | } |
| 125 | |
| 126 | static __inline__ void |
| 127 | teql_neigh_release(struct neighbour *n) |
| 128 | { |
| 129 | if (n) |
| 130 | neigh_release(n); |
| 131 | } |
| 132 | |
| 133 | static void |
| 134 | teql_reset(struct Qdisc* sch) |
| 135 | { |
| 136 | struct teql_sched_data *dat = qdisc_priv(sch); |
| 137 | |
| 138 | skb_queue_purge(&dat->q); |
| 139 | sch->q.qlen = 0; |
| 140 | teql_neigh_release(xchg(&dat->ncache, NULL)); |
| 141 | } |
| 142 | |
| 143 | static void |
| 144 | teql_destroy(struct Qdisc* sch) |
| 145 | { |
| 146 | struct Qdisc *q, *prev; |
| 147 | struct teql_sched_data *dat = qdisc_priv(sch); |
| 148 | struct teql_master *master = dat->m; |
| 149 | |
| 150 | if ((prev = master->slaves) != NULL) { |
| 151 | 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. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 158 | struct netdev_queue *txq; |
David S. Miller | 83874000 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 159 | spinlock_t *root_lock; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 160 | |
| 161 | txq = netdev_get_tx_queue(master->dev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | master->slaves = NULL; |
David S. Miller | 83874000 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 163 | |
| 164 | root_lock = qdisc_root_lock(txq->qdisc); |
| 165 | spin_lock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 166 | qdisc_reset(txq->qdisc); |
David S. Miller | 83874000 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 167 | spin_unlock_bh(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | } |
| 170 | skb_queue_purge(&dat->q); |
| 171 | teql_neigh_release(xchg(&dat->ncache, NULL)); |
| 172 | break; |
| 173 | } |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | } while ((prev = q) != master->slaves); |
| 176 | } |
| 177 | } |
| 178 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 179 | static int teql_qdisc_init(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 181 | struct net_device *dev = qdisc_dev(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | struct teql_master *m = (struct teql_master*)sch->ops; |
| 183 | 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) { |
| 197 | if ((m->dev->flags&IFF_POINTOPOINT && !(dev->flags&IFF_POINTOPOINT)) |
| 198 | || (m->dev->flags&IFF_BROADCAST && !(dev->flags&IFF_BROADCAST)) |
| 199 | || (m->dev->flags&IFF_MULTICAST && !(dev->flags&IFF_MULTICAST)) |
| 200 | || dev->mtu < m->dev->mtu) |
| 201 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | static int |
| 225 | __teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *dev) |
| 226 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 227 | struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, 0); |
| 228 | struct teql_sched_data *q = qdisc_priv(dev_queue->qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | struct neighbour *mn = skb->dst->neighbour; |
| 230 | 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 Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | read_lock(&n->lock); |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 246 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
| 247 | n->ha, NULL, skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | read_unlock(&n->lock); |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | 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 Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 261 | static inline int teql_resolve(struct sk_buff *skb, |
| 262 | struct sk_buff *skb_res, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 264 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); |
| 265 | if (txq->qdisc == &noop_qdisc) |
Evgeniy Polyakov | 4f9f831 | 2007-11-06 03:08:09 -0800 | [diff] [blame] | 266 | return -ENODEV; |
| 267 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 268 | if (dev->header_ops == NULL || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | skb->dst == NULL || |
| 270 | skb->dst->neighbour == NULL) |
| 271 | return 0; |
| 272 | return __teql_resolve(skb, skb_res, dev); |
| 273 | } |
| 274 | |
| 275 | static int teql_master_xmit(struct sk_buff *skb, struct net_device *dev) |
| 276 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 277 | struct teql_master *master = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | struct Qdisc *start, *q; |
| 279 | int busy; |
| 280 | int nores; |
Pavel Emelyanov | 4e3ab47 | 2007-10-21 17:01:29 -0700 | [diff] [blame] | 281 | int subq = skb_get_queue_mapping(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | struct sk_buff *skb_res = NULL; |
| 283 | |
| 284 | start = master->slaves; |
| 285 | |
| 286 | restart: |
| 287 | nores = 0; |
| 288 | busy = 0; |
| 289 | |
| 290 | if ((q = start) == NULL) |
| 291 | goto drop; |
| 292 | |
| 293 | do { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 294 | struct net_device *slave = qdisc_dev(q); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 295 | struct netdev_queue *slave_txq; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 296 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 297 | slave_txq = netdev_get_tx_queue(slave, 0); |
| 298 | if (slave_txq->qdisc_sleeping != q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | continue; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 300 | if (__netif_subqueue_stopped(slave, subq) || |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 301 | !netif_running(slave)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | busy = 1; |
| 303 | continue; |
| 304 | } |
| 305 | |
| 306 | switch (teql_resolve(skb, skb_res, slave)) { |
| 307 | case 0: |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 308 | if (netif_tx_trylock(slave)) { |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 309 | if (!__netif_subqueue_stopped(slave, subq) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | slave->hard_start_xmit(skb, slave) == 0) { |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 311 | netif_tx_unlock(slave); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | master->slaves = NEXT_SLAVE(q); |
| 313 | netif_wake_queue(dev); |
| 314 | master->stats.tx_packets++; |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 315 | master->stats.tx_bytes += |
| 316 | qdisc_pkt_len(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | return 0; |
| 318 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 319 | netif_tx_unlock(slave); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
| 321 | if (netif_queue_stopped(dev)) |
| 322 | busy = 1; |
| 323 | break; |
| 324 | case 1: |
| 325 | master->slaves = NEXT_SLAVE(q); |
| 326 | return 0; |
| 327 | default: |
| 328 | nores = 1; |
| 329 | break; |
| 330 | } |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 331 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | } while ((q = NEXT_SLAVE(q)) != start); |
| 333 | |
| 334 | if (nores && skb_res == NULL) { |
| 335 | skb_res = skb; |
| 336 | goto restart; |
| 337 | } |
| 338 | |
| 339 | if (busy) { |
| 340 | netif_stop_queue(dev); |
| 341 | return 1; |
| 342 | } |
| 343 | master->stats.tx_errors++; |
| 344 | |
| 345 | drop: |
| 346 | master->stats.tx_dropped++; |
| 347 | dev_kfree_skb(skb); |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | static int teql_master_open(struct net_device *dev) |
| 352 | { |
| 353 | struct Qdisc * q; |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 354 | struct teql_master *m = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | int mtu = 0xFFFE; |
| 356 | unsigned flags = IFF_NOARP|IFF_MULTICAST; |
| 357 | |
| 358 | if (m->slaves == NULL) |
| 359 | return -EUNATCH; |
| 360 | |
| 361 | flags = FMASK; |
| 362 | |
| 363 | q = m->slaves; |
| 364 | do { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 365 | struct net_device *slave = qdisc_dev(q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
| 367 | if (slave == NULL) |
| 368 | return -EUNATCH; |
| 369 | |
| 370 | if (slave->mtu < mtu) |
| 371 | mtu = slave->mtu; |
| 372 | if (slave->hard_header_len > LL_MAX_HEADER) |
| 373 | return -EINVAL; |
| 374 | |
| 375 | /* If all the slaves are BROADCAST, master is BROADCAST |
| 376 | If all the slaves are PtP, master is PtP |
| 377 | Otherwise, master is NBMA. |
| 378 | */ |
| 379 | if (!(slave->flags&IFF_POINTOPOINT)) |
| 380 | flags &= ~IFF_POINTOPOINT; |
| 381 | if (!(slave->flags&IFF_BROADCAST)) |
| 382 | flags &= ~IFF_BROADCAST; |
| 383 | if (!(slave->flags&IFF_MULTICAST)) |
| 384 | flags &= ~IFF_MULTICAST; |
| 385 | } while ((q = NEXT_SLAVE(q)) != m->slaves); |
| 386 | |
| 387 | m->dev->mtu = mtu; |
| 388 | m->dev->flags = (m->dev->flags&~FMASK) | flags; |
| 389 | netif_start_queue(m->dev); |
| 390 | return 0; |
| 391 | } |
| 392 | |
| 393 | static int teql_master_close(struct net_device *dev) |
| 394 | { |
| 395 | netif_stop_queue(dev); |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | static struct net_device_stats *teql_master_stats(struct net_device *dev) |
| 400 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 401 | struct teql_master *m = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | return &m->stats; |
| 403 | } |
| 404 | |
| 405 | static int teql_master_mtu(struct net_device *dev, int new_mtu) |
| 406 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 407 | struct teql_master *m = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | struct Qdisc *q; |
| 409 | |
| 410 | if (new_mtu < 68) |
| 411 | return -EINVAL; |
| 412 | |
| 413 | q = m->slaves; |
| 414 | if (q) { |
| 415 | do { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 416 | if (new_mtu > qdisc_dev(q)->mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | return -EINVAL; |
| 418 | } while ((q=NEXT_SLAVE(q)) != m->slaves); |
| 419 | } |
| 420 | |
| 421 | dev->mtu = new_mtu; |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static __init void teql_master_setup(struct net_device *dev) |
| 426 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 427 | struct teql_master *master = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | struct Qdisc_ops *ops = &master->qops; |
| 429 | |
| 430 | master->dev = dev; |
| 431 | ops->priv_size = sizeof(struct teql_sched_data); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | ops->enqueue = teql_enqueue; |
| 434 | ops->dequeue = teql_dequeue; |
| 435 | ops->requeue = teql_requeue; |
| 436 | ops->init = teql_qdisc_init; |
| 437 | ops->reset = teql_reset; |
| 438 | ops->destroy = teql_destroy; |
| 439 | ops->owner = THIS_MODULE; |
| 440 | |
| 441 | dev->open = teql_master_open; |
| 442 | dev->hard_start_xmit = teql_master_xmit; |
| 443 | dev->stop = teql_master_close; |
| 444 | dev->get_stats = teql_master_stats; |
| 445 | dev->change_mtu = teql_master_mtu; |
| 446 | dev->type = ARPHRD_VOID; |
| 447 | dev->mtu = 1500; |
| 448 | dev->tx_queue_len = 100; |
| 449 | dev->flags = IFF_NOARP; |
| 450 | dev->hard_header_len = LL_MAX_HEADER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | static LIST_HEAD(master_dev_list); |
| 454 | static int max_equalizers = 1; |
| 455 | module_param(max_equalizers, int, 0); |
| 456 | MODULE_PARM_DESC(max_equalizers, "Max number of link equalizers"); |
| 457 | |
| 458 | static int __init teql_init(void) |
| 459 | { |
| 460 | int i; |
| 461 | int err = -ENODEV; |
| 462 | |
| 463 | for (i = 0; i < max_equalizers; i++) { |
| 464 | struct net_device *dev; |
| 465 | struct teql_master *master; |
| 466 | |
| 467 | dev = alloc_netdev(sizeof(struct teql_master), |
| 468 | "teql%d", teql_master_setup); |
| 469 | if (!dev) { |
| 470 | err = -ENOMEM; |
| 471 | break; |
| 472 | } |
| 473 | |
| 474 | if ((err = register_netdev(dev))) { |
| 475 | free_netdev(dev); |
| 476 | break; |
| 477 | } |
| 478 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 479 | master = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
| 481 | strlcpy(master->qops.id, dev->name, IFNAMSIZ); |
| 482 | err = register_qdisc(&master->qops); |
| 483 | |
| 484 | if (err) { |
| 485 | unregister_netdev(dev); |
| 486 | free_netdev(dev); |
| 487 | break; |
| 488 | } |
| 489 | |
| 490 | list_add_tail(&master->master_list, &master_dev_list); |
| 491 | } |
| 492 | return i ? 0 : err; |
| 493 | } |
| 494 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 495 | static void __exit teql_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | { |
| 497 | struct teql_master *master, *nxt; |
| 498 | |
| 499 | list_for_each_entry_safe(master, nxt, &master_dev_list, master_list) { |
| 500 | |
| 501 | list_del(&master->master_list); |
| 502 | |
| 503 | unregister_qdisc(&master->qops); |
| 504 | unregister_netdev(master->dev); |
| 505 | free_netdev(master->dev); |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | module_init(teql_init); |
| 510 | module_exit(teql_exit); |
| 511 | |
| 512 | MODULE_LICENSE("GPL"); |