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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/errno.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 17 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/skbuff.h> |
| 21 | #include <linux/moduleparam.h> |
Patrick McHardy | 0ba4805 | 2007-07-02 22:49:07 -0700 | [diff] [blame] | 22 | #include <net/dst.h> |
| 23 | #include <net/neighbour.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #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 | |
| 56 | struct teql_master |
| 57 | { |
| 58 | struct Qdisc_ops qops; |
| 59 | struct net_device *dev; |
| 60 | struct Qdisc *slaves; |
| 61 | struct list_head master_list; |
Eric Dumazet | 1ac9ad1 | 2011-01-12 12:13:14 +0000 | [diff] [blame] | 62 | unsigned long tx_bytes; |
| 63 | unsigned long tx_packets; |
| 64 | unsigned long tx_errors; |
| 65 | unsigned long tx_dropped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | }; |
| 67 | |
| 68 | struct teql_sched_data |
| 69 | { |
| 70 | struct Qdisc *next; |
| 71 | struct teql_master *m; |
| 72 | struct neighbour *ncache; |
| 73 | struct sk_buff_head q; |
| 74 | }; |
| 75 | |
| 76 | #define NEXT_SLAVE(q) (((struct teql_sched_data*)qdisc_priv(q))->next) |
| 77 | |
Roel Kluin | cc8fd14 | 2008-01-31 17:08:47 -0800 | [diff] [blame] | 78 | #define FMASK (IFF_BROADCAST|IFF_POINTOPOINT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | /* "teql*" qdisc routines */ |
| 81 | |
| 82 | static int |
| 83 | teql_enqueue(struct sk_buff *skb, struct Qdisc* sch) |
| 84 | { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 85 | struct net_device *dev = qdisc_dev(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | struct teql_sched_data *q = qdisc_priv(sch); |
| 87 | |
Krishna Kumar | 4cd8c9e | 2007-05-08 18:57:50 -0700 | [diff] [blame] | 88 | if (q->q.qlen < dev->tx_queue_len) { |
| 89 | __skb_queue_tail(&q->q, skb); |
Eric Dumazet | bfe0d02 | 2011-01-09 08:30:54 +0000 | [diff] [blame] | 90 | qdisc_bstats_update(sch, skb); |
Ben Greear | 9871e50 | 2010-08-10 01:45:40 -0700 | [diff] [blame] | 91 | return NET_XMIT_SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | kfree_skb(skb); |
| 95 | sch->qstats.drops++; |
| 96 | return NET_XMIT_DROP; |
| 97 | } |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | static struct sk_buff * |
| 100 | teql_dequeue(struct Qdisc* sch) |
| 101 | { |
| 102 | struct teql_sched_data *dat = qdisc_priv(sch); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 103 | struct netdev_queue *dat_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | struct sk_buff *skb; |
| 105 | |
| 106 | skb = __skb_dequeue(&dat->q); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 107 | dat_queue = netdev_get_tx_queue(dat->m->dev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | if (skb == NULL) { |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 109 | struct net_device *m = qdisc_dev(dat_queue->qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | if (m) { |
| 111 | dat->m->slaves = sch; |
| 112 | netif_wake_queue(m); |
| 113 | } |
| 114 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 115 | sch->q.qlen = dat->q.qlen + dat_queue->qdisc->q.qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | return skb; |
| 117 | } |
| 118 | |
Jarek Poplawski | 8e3af97 | 2008-10-31 00:45:55 -0700 | [diff] [blame] | 119 | static struct sk_buff * |
| 120 | teql_peek(struct Qdisc* sch) |
| 121 | { |
| 122 | /* teql is meant to be used as root qdisc */ |
| 123 | return NULL; |
| 124 | } |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | 8387400 | 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 | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 163 | |
Jarek Poplawski | 102396a | 2008-08-29 14:21:52 -0700 | [diff] [blame] | 164 | root_lock = qdisc_root_sleeping_lock(txq->qdisc); |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 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 | 8387400 | 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) { |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 197 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
| 227 | static int |
| 228 | __teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *dev) |
| 229 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 230 | struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, 0); |
| 231 | struct teql_sched_data *q = qdisc_priv(dev_queue->qdisc); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 232 | struct neighbour *mn = skb_dst(skb)->neighbour; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | 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 Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 247 | char haddr[MAX_ADDR_LEN]; |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 248 | |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 249 | neigh_ha_snapshot(haddr, n, dev); |
| 250 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), haddr, |
| 251 | NULL, skb->len); |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | 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 Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 264 | static inline int teql_resolve(struct sk_buff *skb, |
| 265 | struct sk_buff *skb_res, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 267 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); |
| 268 | if (txq->qdisc == &noop_qdisc) |
Evgeniy Polyakov | 4f9f831 | 2007-11-06 03:08:09 -0800 | [diff] [blame] | 269 | return -ENODEV; |
| 270 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 271 | if (dev->header_ops == NULL || |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 272 | skb_dst(skb) == NULL || |
| 273 | skb_dst(skb)->neighbour == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | return 0; |
| 275 | return __teql_resolve(skb, skb_res, dev); |
| 276 | } |
| 277 | |
Stephen Hemminger | 6fef4c0 | 2009-08-31 19:50:41 +0000 | [diff] [blame] | 278 | static netdev_tx_t teql_master_xmit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 280 | struct teql_master *master = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | struct Qdisc *start, *q; |
| 282 | int busy; |
| 283 | int nores; |
Pavel Emelyanov | 4e3ab47 | 2007-10-21 17:01:29 -0700 | [diff] [blame] | 284 | int subq = skb_get_queue_mapping(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | struct sk_buff *skb_res = NULL; |
| 286 | |
| 287 | start = master->slaves; |
| 288 | |
| 289 | restart: |
| 290 | nores = 0; |
| 291 | busy = 0; |
| 292 | |
| 293 | if ((q = start) == NULL) |
| 294 | goto drop; |
| 295 | |
| 296 | do { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 297 | struct net_device *slave = qdisc_dev(q); |
Stephen Hemminger | 61294e2 | 2009-01-06 10:45:57 -0800 | [diff] [blame] | 298 | struct netdev_queue *slave_txq = netdev_get_tx_queue(slave, 0); |
| 299 | const struct net_device_ops *slave_ops = slave->netdev_ops; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 300 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 301 | if (slave_txq->qdisc_sleeping != q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | continue; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 303 | if (__netif_subqueue_stopped(slave, subq) || |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 304 | !netif_running(slave)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | busy = 1; |
| 306 | continue; |
| 307 | } |
| 308 | |
| 309 | switch (teql_resolve(skb, skb_res, slave)) { |
| 310 | case 0: |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 311 | if (__netif_tx_trylock(slave_txq)) { |
Eric Dumazet | c0f84d0 | 2009-05-18 15:12:31 -0700 | [diff] [blame] | 312 | unsigned int length = qdisc_pkt_len(skb); |
| 313 | |
Eric Dumazet | 5a0d226 | 2010-11-23 10:42:02 +0000 | [diff] [blame] | 314 | if (!netif_tx_queue_frozen_or_stopped(slave_txq) && |
Stephen Hemminger | 6fef4c0 | 2009-08-31 19:50:41 +0000 | [diff] [blame] | 315 | slave_ops->ndo_start_xmit(skb, slave) == NETDEV_TX_OK) { |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 316 | txq_trans_update(slave_txq); |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 317 | __netif_tx_unlock(slave_txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | master->slaves = NEXT_SLAVE(q); |
| 319 | netif_wake_queue(dev); |
Eric Dumazet | 1ac9ad1 | 2011-01-12 12:13:14 +0000 | [diff] [blame] | 320 | master->tx_packets++; |
| 321 | master->tx_bytes += length; |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 322 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 324 | __netif_tx_unlock(slave_txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
| 326 | if (netif_queue_stopped(dev)) |
| 327 | busy = 1; |
| 328 | break; |
| 329 | case 1: |
| 330 | master->slaves = NEXT_SLAVE(q); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 331 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | default: |
| 333 | nores = 1; |
| 334 | break; |
| 335 | } |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 336 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } while ((q = NEXT_SLAVE(q)) != start); |
| 338 | |
| 339 | if (nores && skb_res == NULL) { |
| 340 | skb_res = skb; |
| 341 | goto restart; |
| 342 | } |
| 343 | |
| 344 | if (busy) { |
| 345 | netif_stop_queue(dev); |
Patrick McHardy | 5b54814 | 2009-06-12 06:22:29 +0000 | [diff] [blame] | 346 | return NETDEV_TX_BUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
Eric Dumazet | 1ac9ad1 | 2011-01-12 12:13:14 +0000 | [diff] [blame] | 348 | master->tx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | drop: |
Eric Dumazet | 1ac9ad1 | 2011-01-12 12:13:14 +0000 | [diff] [blame] | 351 | master->tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 353 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | static int teql_master_open(struct net_device *dev) |
| 357 | { |
| 358 | struct Qdisc * q; |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 359 | struct teql_master *m = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | int mtu = 0xFFFE; |
| 361 | unsigned flags = IFF_NOARP|IFF_MULTICAST; |
| 362 | |
| 363 | if (m->slaves == NULL) |
| 364 | return -EUNATCH; |
| 365 | |
| 366 | flags = FMASK; |
| 367 | |
| 368 | q = m->slaves; |
| 369 | do { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 370 | struct net_device *slave = qdisc_dev(q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | if (slave == NULL) |
| 373 | return -EUNATCH; |
| 374 | |
| 375 | if (slave->mtu < mtu) |
| 376 | mtu = slave->mtu; |
| 377 | if (slave->hard_header_len > LL_MAX_HEADER) |
| 378 | return -EINVAL; |
| 379 | |
| 380 | /* If all the slaves are BROADCAST, master is BROADCAST |
| 381 | If all the slaves are PtP, master is PtP |
| 382 | Otherwise, master is NBMA. |
| 383 | */ |
| 384 | if (!(slave->flags&IFF_POINTOPOINT)) |
| 385 | flags &= ~IFF_POINTOPOINT; |
| 386 | if (!(slave->flags&IFF_BROADCAST)) |
| 387 | flags &= ~IFF_BROADCAST; |
| 388 | if (!(slave->flags&IFF_MULTICAST)) |
| 389 | flags &= ~IFF_MULTICAST; |
| 390 | } while ((q = NEXT_SLAVE(q)) != m->slaves); |
| 391 | |
| 392 | m->dev->mtu = mtu; |
| 393 | m->dev->flags = (m->dev->flags&~FMASK) | flags; |
| 394 | netif_start_queue(m->dev); |
| 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | static int teql_master_close(struct net_device *dev) |
| 399 | { |
| 400 | netif_stop_queue(dev); |
| 401 | return 0; |
| 402 | } |
| 403 | |
Eric Dumazet | 1ac9ad1 | 2011-01-12 12:13:14 +0000 | [diff] [blame] | 404 | static struct rtnl_link_stats64 *teql_master_stats64(struct net_device *dev, |
| 405 | struct rtnl_link_stats64 *stats) |
| 406 | { |
| 407 | struct teql_master *m = netdev_priv(dev); |
| 408 | |
| 409 | stats->tx_packets = m->tx_packets; |
| 410 | stats->tx_bytes = m->tx_bytes; |
| 411 | stats->tx_errors = m->tx_errors; |
| 412 | stats->tx_dropped = m->tx_dropped; |
| 413 | return stats; |
| 414 | } |
| 415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | static int teql_master_mtu(struct net_device *dev, int new_mtu) |
| 417 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 418 | struct teql_master *m = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | struct Qdisc *q; |
| 420 | |
| 421 | if (new_mtu < 68) |
| 422 | return -EINVAL; |
| 423 | |
| 424 | q = m->slaves; |
| 425 | if (q) { |
| 426 | do { |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 427 | if (new_mtu > qdisc_dev(q)->mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | return -EINVAL; |
| 429 | } while ((q=NEXT_SLAVE(q)) != m->slaves); |
| 430 | } |
| 431 | |
| 432 | dev->mtu = new_mtu; |
| 433 | return 0; |
| 434 | } |
| 435 | |
Stephen Hemminger | 61294e2 | 2009-01-06 10:45:57 -0800 | [diff] [blame] | 436 | static const struct net_device_ops teql_netdev_ops = { |
| 437 | .ndo_open = teql_master_open, |
| 438 | .ndo_stop = teql_master_close, |
| 439 | .ndo_start_xmit = teql_master_xmit, |
Eric Dumazet | 1ac9ad1 | 2011-01-12 12:13:14 +0000 | [diff] [blame] | 440 | .ndo_get_stats64 = teql_master_stats64, |
Stephen Hemminger | 61294e2 | 2009-01-06 10:45:57 -0800 | [diff] [blame] | 441 | .ndo_change_mtu = teql_master_mtu, |
| 442 | }; |
| 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | static __init void teql_master_setup(struct net_device *dev) |
| 445 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 446 | struct teql_master *master = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | struct Qdisc_ops *ops = &master->qops; |
| 448 | |
| 449 | master->dev = dev; |
| 450 | ops->priv_size = sizeof(struct teql_sched_data); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | ops->enqueue = teql_enqueue; |
| 453 | ops->dequeue = teql_dequeue; |
Jarek Poplawski | 8e3af97 | 2008-10-31 00:45:55 -0700 | [diff] [blame] | 454 | ops->peek = teql_peek; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | ops->init = teql_qdisc_init; |
| 456 | ops->reset = teql_reset; |
| 457 | ops->destroy = teql_destroy; |
| 458 | ops->owner = THIS_MODULE; |
| 459 | |
Stephen Hemminger | 61294e2 | 2009-01-06 10:45:57 -0800 | [diff] [blame] | 460 | dev->netdev_ops = &teql_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | dev->type = ARPHRD_VOID; |
| 462 | dev->mtu = 1500; |
| 463 | dev->tx_queue_len = 100; |
| 464 | dev->flags = IFF_NOARP; |
| 465 | dev->hard_header_len = LL_MAX_HEADER; |
Tom Hughes | fa68a78 | 2010-06-15 22:24:28 +0000 | [diff] [blame] | 466 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | static LIST_HEAD(master_dev_list); |
| 470 | static int max_equalizers = 1; |
| 471 | module_param(max_equalizers, int, 0); |
| 472 | MODULE_PARM_DESC(max_equalizers, "Max number of link equalizers"); |
| 473 | |
| 474 | static int __init teql_init(void) |
| 475 | { |
| 476 | int i; |
| 477 | int err = -ENODEV; |
| 478 | |
| 479 | for (i = 0; i < max_equalizers; i++) { |
| 480 | struct net_device *dev; |
| 481 | struct teql_master *master; |
| 482 | |
| 483 | dev = alloc_netdev(sizeof(struct teql_master), |
| 484 | "teql%d", teql_master_setup); |
| 485 | if (!dev) { |
| 486 | err = -ENOMEM; |
| 487 | break; |
| 488 | } |
| 489 | |
| 490 | if ((err = register_netdev(dev))) { |
| 491 | free_netdev(dev); |
| 492 | break; |
| 493 | } |
| 494 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 495 | master = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
| 497 | strlcpy(master->qops.id, dev->name, IFNAMSIZ); |
| 498 | err = register_qdisc(&master->qops); |
| 499 | |
| 500 | if (err) { |
| 501 | unregister_netdev(dev); |
| 502 | free_netdev(dev); |
| 503 | break; |
| 504 | } |
| 505 | |
| 506 | list_add_tail(&master->master_list, &master_dev_list); |
| 507 | } |
| 508 | return i ? 0 : err; |
| 509 | } |
| 510 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 511 | static void __exit teql_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | { |
| 513 | struct teql_master *master, *nxt; |
| 514 | |
| 515 | list_for_each_entry_safe(master, nxt, &master_dev_list, master_list) { |
| 516 | |
| 517 | list_del(&master->master_list); |
| 518 | |
| 519 | unregister_qdisc(&master->qops); |
| 520 | unregister_netdev(master->dev); |
| 521 | free_netdev(master->dev); |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | module_init(teql_init); |
| 526 | module_exit(teql_exit); |
| 527 | |
| 528 | MODULE_LICENSE("GPL"); |