Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
1 /*
2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  *
34  * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
35  */
36
37 #include "ipoib.h"
38
39 #include <linux/module.h>
40
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/vmalloc.h>
44 #include <linux/kernel.h>
45
46 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
47
48 #include <linux/ip.h>
49 #include <linux/in.h>
50
51 #include <net/dst.h>
52
53 MODULE_AUTHOR("Roland Dreier");
54 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
58 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
59
60 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
61 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
62 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
63 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
64
65 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
66 int ipoib_debug_level;
67
68 module_param_named(debug_level, ipoib_debug_level, int, 0644);
69 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
70 #endif
71
72 struct ipoib_path_iter {
73         struct net_device *dev;
74         struct ipoib_path  path;
75 };
76
77 static const u8 ipv4_bcast_addr[] = {
78         0x00, 0xff, 0xff, 0xff,
79         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
80         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
81 };
82
83 struct workqueue_struct *ipoib_workqueue;
84
85 static void ipoib_add_one(struct ib_device *device);
86 static void ipoib_remove_one(struct ib_device *device);
87
88 static struct ib_client ipoib_client = {
89         .name   = "ipoib",
90         .add    = ipoib_add_one,
91         .remove = ipoib_remove_one
92 };
93
94 int ipoib_open(struct net_device *dev)
95 {
96         struct ipoib_dev_priv *priv = netdev_priv(dev);
97
98         ipoib_dbg(priv, "bringing up interface\n");
99
100         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
101
102         if (ipoib_pkey_dev_delay_open(dev))
103                 return 0;
104
105         if (ipoib_ib_dev_open(dev))
106                 return -EINVAL;
107
108         if (ipoib_ib_dev_up(dev)) {
109                 ipoib_ib_dev_stop(dev);
110                 return -EINVAL;
111         }
112
113         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
114                 struct ipoib_dev_priv *cpriv;
115
116                 /* Bring up any child interfaces too */
117                 mutex_lock(&priv->vlan_mutex);
118                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
119                         int flags;
120
121                         flags = cpriv->dev->flags;
122                         if (flags & IFF_UP)
123                                 continue;
124
125                         dev_change_flags(cpriv->dev, flags | IFF_UP);
126                 }
127                 mutex_unlock(&priv->vlan_mutex);
128         }
129
130         netif_start_queue(dev);
131
132         return 0;
133 }
134
135 static int ipoib_stop(struct net_device *dev)
136 {
137         struct ipoib_dev_priv *priv = netdev_priv(dev);
138
139         ipoib_dbg(priv, "stopping interface\n");
140
141         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
142
143         netif_stop_queue(dev);
144
145         /*
146          * Now flush workqueue to make sure a scheduled task doesn't
147          * bring our internal state back up.
148          */
149         flush_workqueue(ipoib_workqueue);
150
151         ipoib_ib_dev_down(dev, 1);
152         ipoib_ib_dev_stop(dev);
153
154         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
155                 struct ipoib_dev_priv *cpriv;
156
157                 /* Bring down any child interfaces too */
158                 mutex_lock(&priv->vlan_mutex);
159                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
160                         int flags;
161
162                         flags = cpriv->dev->flags;
163                         if (!(flags & IFF_UP))
164                                 continue;
165
166                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
167                 }
168                 mutex_unlock(&priv->vlan_mutex);
169         }
170
171         return 0;
172 }
173
174 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
175 {
176         struct ipoib_dev_priv *priv = netdev_priv(dev);
177
178         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
179                 return -EINVAL;
180
181         priv->admin_mtu = new_mtu;
182
183         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
184
185         return 0;
186 }
187
188 static struct ipoib_path *__path_find(struct net_device *dev,
189                                       union ib_gid *gid)
190 {
191         struct ipoib_dev_priv *priv = netdev_priv(dev);
192         struct rb_node *n = priv->path_tree.rb_node;
193         struct ipoib_path *path;
194         int ret;
195
196         while (n) {
197                 path = rb_entry(n, struct ipoib_path, rb_node);
198
199                 ret = memcmp(gid->raw, path->pathrec.dgid.raw,
200                              sizeof (union ib_gid));
201
202                 if (ret < 0)
203                         n = n->rb_left;
204                 else if (ret > 0)
205                         n = n->rb_right;
206                 else
207                         return path;
208         }
209
210         return NULL;
211 }
212
213 static int __path_add(struct net_device *dev, struct ipoib_path *path)
214 {
215         struct ipoib_dev_priv *priv = netdev_priv(dev);
216         struct rb_node **n = &priv->path_tree.rb_node;
217         struct rb_node *pn = NULL;
218         struct ipoib_path *tpath;
219         int ret;
220
221         while (*n) {
222                 pn = *n;
223                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
224
225                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
226                              sizeof (union ib_gid));
227                 if (ret < 0)
228                         n = &pn->rb_left;
229                 else if (ret > 0)
230                         n = &pn->rb_right;
231                 else
232                         return -EEXIST;
233         }
234
235         rb_link_node(&path->rb_node, pn, n);
236         rb_insert_color(&path->rb_node, &priv->path_tree);
237
238         list_add_tail(&path->list, &priv->path_list);
239
240         return 0;
241 }
242
243 static void path_free(struct net_device *dev, struct ipoib_path *path)
244 {
245         struct ipoib_dev_priv *priv = netdev_priv(dev);
246         struct ipoib_neigh *neigh, *tn;
247         struct sk_buff *skb;
248         unsigned long flags;
249
250         while ((skb = __skb_dequeue(&path->queue)))
251                 dev_kfree_skb_irq(skb);
252
253         spin_lock_irqsave(&priv->lock, flags);
254
255         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
256                 /*
257                  * It's safe to call ipoib_put_ah() inside priv->lock
258                  * here, because we know that path->ah will always
259                  * hold one more reference, so ipoib_put_ah() will
260                  * never do more than decrement the ref count.
261                  */
262                 if (neigh->ah)
263                         ipoib_put_ah(neigh->ah);
264
265                 ipoib_neigh_free(neigh);
266         }
267
268         spin_unlock_irqrestore(&priv->lock, flags);
269
270         if (path->ah)
271                 ipoib_put_ah(path->ah);
272
273         kfree(path);
274 }
275
276 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
277
278 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
279 {
280         struct ipoib_path_iter *iter;
281
282         iter = kmalloc(sizeof *iter, GFP_KERNEL);
283         if (!iter)
284                 return NULL;
285
286         iter->dev = dev;
287         memset(iter->path.pathrec.dgid.raw, 0, 16);
288
289         if (ipoib_path_iter_next(iter)) {
290                 kfree(iter);
291                 return NULL;
292         }
293
294         return iter;
295 }
296
297 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
298 {
299         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
300         struct rb_node *n;
301         struct ipoib_path *path;
302         int ret = 1;
303
304         spin_lock_irq(&priv->lock);
305
306         n = rb_first(&priv->path_tree);
307
308         while (n) {
309                 path = rb_entry(n, struct ipoib_path, rb_node);
310
311                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
312                            sizeof (union ib_gid)) < 0) {
313                         iter->path = *path;
314                         ret = 0;
315                         break;
316                 }
317
318                 n = rb_next(n);
319         }
320
321         spin_unlock_irq(&priv->lock);
322
323         return ret;
324 }
325
326 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
327                           struct ipoib_path *path)
328 {
329         *path = iter->path;
330 }
331
332 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
333
334 void ipoib_flush_paths(struct net_device *dev)
335 {
336         struct ipoib_dev_priv *priv = netdev_priv(dev);
337         struct ipoib_path *path, *tp;
338         LIST_HEAD(remove_list);
339
340         spin_lock_irq(&priv->lock);
341
342         list_splice(&priv->path_list, &remove_list);
343         INIT_LIST_HEAD(&priv->path_list);
344
345         list_for_each_entry(path, &remove_list, list)
346                 rb_erase(&path->rb_node, &priv->path_tree);
347
348         list_for_each_entry_safe(path, tp, &remove_list, list) {
349                 if (path->query)
350                         ib_sa_cancel_query(path->query_id, path->query);
351                 spin_unlock_irq(&priv->lock);
352                 wait_for_completion(&path->done);
353                 path_free(dev, path);
354                 spin_lock_irq(&priv->lock);
355         }
356         spin_unlock_irq(&priv->lock);
357 }
358
359 static void path_rec_completion(int status,
360                                 struct ib_sa_path_rec *pathrec,
361                                 void *path_ptr)
362 {
363         struct ipoib_path *path = path_ptr;
364         struct net_device *dev = path->dev;
365         struct ipoib_dev_priv *priv = netdev_priv(dev);
366         struct ipoib_ah *ah = NULL;
367         struct ipoib_neigh *neigh;
368         struct sk_buff_head skqueue;
369         struct sk_buff *skb;
370         unsigned long flags;
371
372         if (pathrec)
373                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
374                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
375         else
376                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
377                           status, IPOIB_GID_ARG(path->pathrec.dgid));
378
379         skb_queue_head_init(&skqueue);
380
381         if (!status) {
382                 struct ib_ah_attr av = {
383                         .dlid          = be16_to_cpu(pathrec->dlid),
384                         .sl            = pathrec->sl,
385                         .port_num      = priv->port,
386                         .static_rate   = pathrec->rate
387                 };
388
389                 ah = ipoib_create_ah(dev, priv->pd, &av);
390         }
391
392         spin_lock_irqsave(&priv->lock, flags);
393
394         path->ah = ah;
395
396         if (ah) {
397                 path->pathrec = *pathrec;
398
399                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
400                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
401
402                 while ((skb = __skb_dequeue(&path->queue)))
403                         __skb_queue_tail(&skqueue, skb);
404
405                 list_for_each_entry(neigh, &path->neigh_list, list) {
406                         kref_get(&path->ah->ref);
407                         neigh->ah = path->ah;
408
409                         while ((skb = __skb_dequeue(&neigh->queue)))
410                                 __skb_queue_tail(&skqueue, skb);
411                 }
412         }
413
414         path->query = NULL;
415         complete(&path->done);
416
417         spin_unlock_irqrestore(&priv->lock, flags);
418
419         while ((skb = __skb_dequeue(&skqueue))) {
420                 skb->dev = dev;
421                 if (dev_queue_xmit(skb))
422                         ipoib_warn(priv, "dev_queue_xmit failed "
423                                    "to requeue packet\n");
424         }
425 }
426
427 static struct ipoib_path *path_rec_create(struct net_device *dev,
428                                           union ib_gid *gid)
429 {
430         struct ipoib_dev_priv *priv = netdev_priv(dev);
431         struct ipoib_path *path;
432
433         path = kzalloc(sizeof *path, GFP_ATOMIC);
434         if (!path)
435                 return NULL;
436
437         path->dev = dev;
438
439         skb_queue_head_init(&path->queue);
440
441         INIT_LIST_HEAD(&path->neigh_list);
442
443         memcpy(path->pathrec.dgid.raw, gid->raw, sizeof (union ib_gid));
444         path->pathrec.sgid      = priv->local_gid;
445         path->pathrec.pkey      = cpu_to_be16(priv->pkey);
446         path->pathrec.numb_path = 1;
447
448         return path;
449 }
450
451 static int path_rec_start(struct net_device *dev,
452                           struct ipoib_path *path)
453 {
454         struct ipoib_dev_priv *priv = netdev_priv(dev);
455
456         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
457                   IPOIB_GID_ARG(path->pathrec.dgid));
458
459         init_completion(&path->done);
460
461         path->query_id =
462                 ib_sa_path_rec_get(priv->ca, priv->port,
463                                    &path->pathrec,
464                                    IB_SA_PATH_REC_DGID          |
465                                    IB_SA_PATH_REC_SGID          |
466                                    IB_SA_PATH_REC_NUMB_PATH     |
467                                    IB_SA_PATH_REC_PKEY,
468                                    1000, GFP_ATOMIC,
469                                    path_rec_completion,
470                                    path, &path->query);
471         if (path->query_id < 0) {
472                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
473                 path->query = NULL;
474                 return path->query_id;
475         }
476
477         return 0;
478 }
479
480 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
481 {
482         struct ipoib_dev_priv *priv = netdev_priv(dev);
483         struct ipoib_path *path;
484         struct ipoib_neigh *neigh;
485
486         neigh = ipoib_neigh_alloc(skb->dst->neighbour);
487         if (!neigh) {
488                 ++priv->stats.tx_dropped;
489                 dev_kfree_skb_any(skb);
490                 return;
491         }
492
493         skb_queue_head_init(&neigh->queue);
494
495         /*
496          * We can only be called from ipoib_start_xmit, so we're
497          * inside tx_lock -- no need to save/restore flags.
498          */
499         spin_lock(&priv->lock);
500
501         path = __path_find(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4));
502         if (!path) {
503                 path = path_rec_create(dev,
504                                        (union ib_gid *) (skb->dst->neighbour->ha + 4));
505                 if (!path)
506                         goto err_path;
507
508                 __path_add(dev, path);
509         }
510
511         list_add_tail(&neigh->list, &path->neigh_list);
512
513         if (path->ah) {
514                 kref_get(&path->ah->ref);
515                 neigh->ah = path->ah;
516
517                 ipoib_send(dev, skb, path->ah,
518                            be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
519         } else {
520                 neigh->ah  = NULL;
521                 __skb_queue_tail(&neigh->queue, skb);
522
523                 if (!path->query && path_rec_start(dev, path))
524                         goto err_list;
525         }
526
527         spin_unlock(&priv->lock);
528         return;
529
530 err_list:
531         list_del(&neigh->list);
532
533 err_path:
534         ipoib_neigh_free(neigh);
535         ++priv->stats.tx_dropped;
536         dev_kfree_skb_any(skb);
537
538         spin_unlock(&priv->lock);
539 }
540
541 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
542 {
543         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
544
545         /* Look up path record for unicasts */
546         if (skb->dst->neighbour->ha[4] != 0xff) {
547                 neigh_add_path(skb, dev);
548                 return;
549         }
550
551         /* Add in the P_Key for multicasts */
552         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
553         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
554         ipoib_mcast_send(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4), skb);
555 }
556
557 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
558                              struct ipoib_pseudoheader *phdr)
559 {
560         struct ipoib_dev_priv *priv = netdev_priv(dev);
561         struct ipoib_path *path;
562
563         /*
564          * We can only be called from ipoib_start_xmit, so we're
565          * inside tx_lock -- no need to save/restore flags.
566          */
567         spin_lock(&priv->lock);
568
569         path = __path_find(dev, (union ib_gid *) (phdr->hwaddr + 4));
570         if (!path) {
571                 path = path_rec_create(dev,
572                                        (union ib_gid *) (phdr->hwaddr + 4));
573                 if (path) {
574                         /* put pseudoheader back on for next time */
575                         skb_push(skb, sizeof *phdr);
576                         __skb_queue_tail(&path->queue, skb);
577
578                         if (path_rec_start(dev, path)) {
579                                 spin_unlock(&priv->lock);
580                                 path_free(dev, path);
581                                 return;
582                         } else
583                                 __path_add(dev, path);
584                 } else {
585                         ++priv->stats.tx_dropped;
586                         dev_kfree_skb_any(skb);
587                 }
588
589                 spin_unlock(&priv->lock);
590                 return;
591         }
592
593         if (path->ah) {
594                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
595                           be16_to_cpu(path->pathrec.dlid));
596
597                 ipoib_send(dev, skb, path->ah,
598                            be32_to_cpup((__be32 *) phdr->hwaddr));
599         } else if ((path->query || !path_rec_start(dev, path)) &&
600                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
601                 /* put pseudoheader back on for next time */
602                 skb_push(skb, sizeof *phdr);
603                 __skb_queue_tail(&path->queue, skb);
604         } else {
605                 ++priv->stats.tx_dropped;
606                 dev_kfree_skb_any(skb);
607         }
608
609         spin_unlock(&priv->lock);
610 }
611
612 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
613 {
614         struct ipoib_dev_priv *priv = netdev_priv(dev);
615         struct ipoib_neigh *neigh;
616         unsigned long flags;
617
618         if (!spin_trylock_irqsave(&priv->tx_lock, flags))
619                 return NETDEV_TX_LOCKED;
620
621         /*
622          * Check if our queue is stopped.  Since we have the LLTX bit
623          * set, we can't rely on netif_stop_queue() preventing our
624          * xmit function from being called with a full queue.
625          */
626         if (unlikely(netif_queue_stopped(dev))) {
627                 spin_unlock_irqrestore(&priv->tx_lock, flags);
628                 return NETDEV_TX_BUSY;
629         }
630
631         if (skb->dst && skb->dst->neighbour) {
632                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
633                         ipoib_path_lookup(skb, dev);
634                         goto out;
635                 }
636
637                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
638
639                 if (likely(neigh->ah)) {
640                         ipoib_send(dev, skb, neigh->ah,
641                                    be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
642                         goto out;
643                 }
644
645                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
646                         spin_lock(&priv->lock);
647                         __skb_queue_tail(&neigh->queue, skb);
648                         spin_unlock(&priv->lock);
649                 } else {
650                         ++priv->stats.tx_dropped;
651                         dev_kfree_skb_any(skb);
652                 }
653         } else {
654                 struct ipoib_pseudoheader *phdr =
655                         (struct ipoib_pseudoheader *) skb->data;
656                 skb_pull(skb, sizeof *phdr);
657
658                 if (phdr->hwaddr[4] == 0xff) {
659                         /* Add in the P_Key for multicast*/
660                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
661                         phdr->hwaddr[9] = priv->pkey & 0xff;
662
663                         ipoib_mcast_send(dev, (union ib_gid *) (phdr->hwaddr + 4), skb);
664                 } else {
665                         /* unicast GID -- should be ARP or RARP reply */
666
667                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
668                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
669                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
670                                            IPOIB_GID_FMT "\n",
671                                            skb->dst ? "neigh" : "dst",
672                                            be16_to_cpup((__be16 *) skb->data),
673                                            be32_to_cpup((__be32 *) phdr->hwaddr),
674                                            IPOIB_GID_ARG(*(union ib_gid *) (phdr->hwaddr + 4)));
675                                 dev_kfree_skb_any(skb);
676                                 ++priv->stats.tx_dropped;
677                                 goto out;
678                         }
679
680                         unicast_arp_send(skb, dev, phdr);
681                 }
682         }
683
684 out:
685         spin_unlock_irqrestore(&priv->tx_lock, flags);
686
687         return NETDEV_TX_OK;
688 }
689
690 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
691 {
692         struct ipoib_dev_priv *priv = netdev_priv(dev);
693
694         return &priv->stats;
695 }
696
697 static void ipoib_timeout(struct net_device *dev)
698 {
699         struct ipoib_dev_priv *priv = netdev_priv(dev);
700
701         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
702                    jiffies_to_msecs(jiffies - dev->trans_start));
703         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
704                    netif_queue_stopped(dev),
705                    priv->tx_head, priv->tx_tail);
706         /* XXX reset QP, etc. */
707 }
708
709 static int ipoib_hard_header(struct sk_buff *skb,
710                              struct net_device *dev,
711                              unsigned short type,
712                              void *daddr, void *saddr, unsigned len)
713 {
714         struct ipoib_header *header;
715
716         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
717
718         header->proto = htons(type);
719         header->reserved = 0;
720
721         /*
722          * If we don't have a neighbour structure, stuff the
723          * destination address onto the front of the skb so we can
724          * figure out where to send the packet later.
725          */
726         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
727                 struct ipoib_pseudoheader *phdr =
728                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
729                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
730         }
731
732         return 0;
733 }
734
735 static void ipoib_set_mcast_list(struct net_device *dev)
736 {
737         struct ipoib_dev_priv *priv = netdev_priv(dev);
738
739         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
740                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
741                 return;
742         }
743
744         queue_work(ipoib_workqueue, &priv->restart_task);
745 }
746
747 static void ipoib_neigh_destructor(struct neighbour *n)
748 {
749         struct ipoib_neigh *neigh;
750         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
751         unsigned long flags;
752         struct ipoib_ah *ah = NULL;
753
754         ipoib_dbg(priv,
755                   "neigh_destructor for %06x " IPOIB_GID_FMT "\n",
756                   be32_to_cpup((__be32 *) n->ha),
757                   IPOIB_GID_ARG(*((union ib_gid *) (n->ha + 4))));
758
759         spin_lock_irqsave(&priv->lock, flags);
760
761         neigh = *to_ipoib_neigh(n);
762         if (neigh) {
763                 if (neigh->ah)
764                         ah = neigh->ah;
765                 list_del(&neigh->list);
766                 ipoib_neigh_free(neigh);
767         }
768
769         spin_unlock_irqrestore(&priv->lock, flags);
770
771         if (ah)
772                 ipoib_put_ah(ah);
773 }
774
775 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
776 {
777         struct ipoib_neigh *neigh;
778
779         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
780         if (!neigh)
781                 return NULL;
782
783         neigh->neighbour = neighbour;
784         *to_ipoib_neigh(neighbour) = neigh;
785
786         return neigh;
787 }
788
789 void ipoib_neigh_free(struct ipoib_neigh *neigh)
790 {
791         *to_ipoib_neigh(neigh->neighbour) = NULL;
792         kfree(neigh);
793 }
794
795 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
796 {
797         parms->neigh_destructor = ipoib_neigh_destructor;
798
799         return 0;
800 }
801
802 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
803 {
804         struct ipoib_dev_priv *priv = netdev_priv(dev);
805
806         /* Allocate RX/TX "rings" to hold queued skbs */
807         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
808                                 GFP_KERNEL);
809         if (!priv->rx_ring) {
810                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
811                        ca->name, ipoib_recvq_size);
812                 goto out;
813         }
814
815         priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
816                                 GFP_KERNEL);
817         if (!priv->tx_ring) {
818                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
819                        ca->name, ipoib_sendq_size);
820                 goto out_rx_ring_cleanup;
821         }
822
823         /* priv->tx_head & tx_tail are already 0 */
824
825         if (ipoib_ib_dev_init(dev, ca, port))
826                 goto out_tx_ring_cleanup;
827
828         return 0;
829
830 out_tx_ring_cleanup:
831         kfree(priv->tx_ring);
832
833 out_rx_ring_cleanup:
834         kfree(priv->rx_ring);
835
836 out:
837         return -ENOMEM;
838 }
839
840 void ipoib_dev_cleanup(struct net_device *dev)
841 {
842         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
843
844         ipoib_delete_debug_files(dev);
845
846         /* Delete any child interfaces first */
847         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
848                 unregister_netdev(cpriv->dev);
849                 ipoib_dev_cleanup(cpriv->dev);
850                 free_netdev(cpriv->dev);
851         }
852
853         ipoib_ib_dev_cleanup(dev);
854
855         kfree(priv->rx_ring);
856         kfree(priv->tx_ring);
857
858         priv->rx_ring = NULL;
859         priv->tx_ring = NULL;
860 }
861
862 static void ipoib_setup(struct net_device *dev)
863 {
864         struct ipoib_dev_priv *priv = netdev_priv(dev);
865
866         dev->open                = ipoib_open;
867         dev->stop                = ipoib_stop;
868         dev->change_mtu          = ipoib_change_mtu;
869         dev->hard_start_xmit     = ipoib_start_xmit;
870         dev->get_stats           = ipoib_get_stats;
871         dev->tx_timeout          = ipoib_timeout;
872         dev->hard_header         = ipoib_hard_header;
873         dev->set_multicast_list  = ipoib_set_mcast_list;
874         dev->neigh_setup         = ipoib_neigh_setup_dev;
875
876         dev->watchdog_timeo      = HZ;
877
878         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
879
880         /*
881          * We add in INFINIBAND_ALEN to allow for the destination
882          * address "pseudoheader" for skbs without neighbour struct.
883          */
884         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
885         dev->addr_len            = INFINIBAND_ALEN;
886         dev->type                = ARPHRD_INFINIBAND;
887         dev->tx_queue_len        = ipoib_sendq_size * 2;
888         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
889
890         /* MTU will be reset when mcast join happens */
891         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
892         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
893
894         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
895
896         netif_carrier_off(dev);
897
898         SET_MODULE_OWNER(dev);
899
900         priv->dev = dev;
901
902         spin_lock_init(&priv->lock);
903         spin_lock_init(&priv->tx_lock);
904
905         mutex_init(&priv->mcast_mutex);
906         mutex_init(&priv->vlan_mutex);
907
908         INIT_LIST_HEAD(&priv->path_list);
909         INIT_LIST_HEAD(&priv->child_intfs);
910         INIT_LIST_HEAD(&priv->dead_ahs);
911         INIT_LIST_HEAD(&priv->multicast_list);
912
913         INIT_WORK(&priv->pkey_task,    ipoib_pkey_poll,          priv->dev);
914         INIT_WORK(&priv->mcast_task,   ipoib_mcast_join_task,    priv->dev);
915         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush,       priv->dev);
916         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task, priv->dev);
917         INIT_WORK(&priv->ah_reap_task, ipoib_reap_ah,            priv->dev);
918 }
919
920 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
921 {
922         struct net_device *dev;
923
924         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
925                            ipoib_setup);
926         if (!dev)
927                 return NULL;
928
929         return netdev_priv(dev);
930 }
931
932 static ssize_t show_pkey(struct class_device *cdev, char *buf)
933 {
934         struct ipoib_dev_priv *priv =
935                 netdev_priv(container_of(cdev, struct net_device, class_dev));
936
937         return sprintf(buf, "0x%04x\n", priv->pkey);
938 }
939 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
940
941 static ssize_t create_child(struct class_device *cdev,
942                             const char *buf, size_t count)
943 {
944         int pkey;
945         int ret;
946
947         if (sscanf(buf, "%i", &pkey) != 1)
948                 return -EINVAL;
949
950         if (pkey < 0 || pkey > 0xffff)
951                 return -EINVAL;
952
953         /*
954          * Set the full membership bit, so that we join the right
955          * broadcast group, etc.
956          */
957         pkey |= 0x8000;
958
959         ret = ipoib_vlan_add(container_of(cdev, struct net_device, class_dev),
960                              pkey);
961
962         return ret ? ret : count;
963 }
964 static CLASS_DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
965
966 static ssize_t delete_child(struct class_device *cdev,
967                             const char *buf, size_t count)
968 {
969         int pkey;
970         int ret;
971
972         if (sscanf(buf, "%i", &pkey) != 1)
973                 return -EINVAL;
974
975         if (pkey < 0 || pkey > 0xffff)
976                 return -EINVAL;
977
978         ret = ipoib_vlan_delete(container_of(cdev, struct net_device, class_dev),
979                                 pkey);
980
981         return ret ? ret : count;
982
983 }
984 static CLASS_DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
985
986 int ipoib_add_pkey_attr(struct net_device *dev)
987 {
988         return class_device_create_file(&dev->class_dev,
989                                         &class_device_attr_pkey);
990 }
991
992 static struct net_device *ipoib_add_port(const char *format,
993                                          struct ib_device *hca, u8 port)
994 {
995         struct ipoib_dev_priv *priv;
996         int result = -ENOMEM;
997
998         priv = ipoib_intf_alloc(format);
999         if (!priv)
1000                 goto alloc_mem_failed;
1001
1002         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1003
1004         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1005         if (result) {
1006                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1007                        hca->name, port, result);
1008                 goto alloc_mem_failed;
1009         }
1010
1011         /*
1012          * Set the full membership bit, so that we join the right
1013          * broadcast group, etc.
1014          */
1015         priv->pkey |= 0x8000;
1016
1017         priv->dev->broadcast[8] = priv->pkey >> 8;
1018         priv->dev->broadcast[9] = priv->pkey & 0xff;
1019
1020         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1021         if (result) {
1022                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1023                        hca->name, port, result);
1024                 goto alloc_mem_failed;
1025         } else
1026                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1027
1028
1029         result = ipoib_dev_init(priv->dev, hca, port);
1030         if (result < 0) {
1031                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1032                        hca->name, port, result);
1033                 goto device_init_failed;
1034         }
1035
1036         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1037                               priv->ca, ipoib_event);
1038         result = ib_register_event_handler(&priv->event_handler);
1039         if (result < 0) {
1040                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1041                        "port %d (ret = %d)\n",
1042                        hca->name, port, result);
1043                 goto event_failed;
1044         }
1045
1046         result = register_netdev(priv->dev);
1047         if (result) {
1048                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1049                        hca->name, port, result);
1050                 goto register_failed;
1051         }
1052
1053         ipoib_create_debug_files(priv->dev);
1054
1055         if (ipoib_add_pkey_attr(priv->dev))
1056                 goto sysfs_failed;
1057         if (class_device_create_file(&priv->dev->class_dev,
1058                                      &class_device_attr_create_child))
1059                 goto sysfs_failed;
1060         if (class_device_create_file(&priv->dev->class_dev,
1061                                      &class_device_attr_delete_child))
1062                 goto sysfs_failed;
1063
1064         return priv->dev;
1065
1066 sysfs_failed:
1067         ipoib_delete_debug_files(priv->dev);
1068         unregister_netdev(priv->dev);
1069
1070 register_failed:
1071         ib_unregister_event_handler(&priv->event_handler);
1072         flush_scheduled_work();
1073
1074 event_failed:
1075         ipoib_dev_cleanup(priv->dev);
1076
1077 device_init_failed:
1078         free_netdev(priv->dev);
1079
1080 alloc_mem_failed:
1081         return ERR_PTR(result);
1082 }
1083
1084 static void ipoib_add_one(struct ib_device *device)
1085 {
1086         struct list_head *dev_list;
1087         struct net_device *dev;
1088         struct ipoib_dev_priv *priv;
1089         int s, e, p;
1090
1091         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1092         if (!dev_list)
1093                 return;
1094
1095         INIT_LIST_HEAD(dev_list);
1096
1097         if (device->node_type == IB_NODE_SWITCH) {
1098                 s = 0;
1099                 e = 0;
1100         } else {
1101                 s = 1;
1102                 e = device->phys_port_cnt;
1103         }
1104
1105         for (p = s; p <= e; ++p) {
1106                 dev = ipoib_add_port("ib%d", device, p);
1107                 if (!IS_ERR(dev)) {
1108                         priv = netdev_priv(dev);
1109                         list_add_tail(&priv->list, dev_list);
1110                 }
1111         }
1112
1113         ib_set_client_data(device, &ipoib_client, dev_list);
1114 }
1115
1116 static void ipoib_remove_one(struct ib_device *device)
1117 {
1118         struct ipoib_dev_priv *priv, *tmp;
1119         struct list_head *dev_list;
1120
1121         dev_list = ib_get_client_data(device, &ipoib_client);
1122
1123         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1124                 ib_unregister_event_handler(&priv->event_handler);
1125                 flush_scheduled_work();
1126
1127                 unregister_netdev(priv->dev);
1128                 ipoib_dev_cleanup(priv->dev);
1129                 free_netdev(priv->dev);
1130         }
1131
1132         kfree(dev_list);
1133 }
1134
1135 static int __init ipoib_init_module(void)
1136 {
1137         int ret;
1138
1139         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1140         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1141         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1142
1143         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1144         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1145         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1146
1147         ret = ipoib_register_debugfs();
1148         if (ret)
1149                 return ret;
1150
1151         /*
1152          * We create our own workqueue mainly because we want to be
1153          * able to flush it when devices are being removed.  We can't
1154          * use schedule_work()/flush_scheduled_work() because both
1155          * unregister_netdev() and linkwatch_event take the rtnl lock,
1156          * so flush_scheduled_work() can deadlock during device
1157          * removal.
1158          */
1159         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1160         if (!ipoib_workqueue) {
1161                 ret = -ENOMEM;
1162                 goto err_fs;
1163         }
1164
1165         ret = ib_register_client(&ipoib_client);
1166         if (ret)
1167                 goto err_wq;
1168
1169         return 0;
1170
1171 err_wq:
1172         destroy_workqueue(ipoib_workqueue);
1173
1174 err_fs:
1175         ipoib_unregister_debugfs();
1176
1177         return ret;
1178 }
1179
1180 static void __exit ipoib_cleanup_module(void)
1181 {
1182         ib_unregister_client(&ipoib_client);
1183         ipoib_unregister_debugfs();
1184         destroy_workqueue(ipoib_workqueue);
1185 }
1186
1187 module_init(ipoib_init_module);
1188 module_exit(ipoib_cleanup_module);