Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-3.10.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
1 /*
2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  *
32  * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
33  */
34
35 #include "ipoib.h"
36
37 #include <linux/version.h>
38 #include <linux/module.h>
39
40 #include <linux/init.h>
41 #include <linux/slab.h>
42 #include <linux/vmalloc.h>
43
44 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
45
46 #include <linux/ip.h>
47 #include <linux/in.h>
48
49 MODULE_AUTHOR("Roland Dreier");
50 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
51 MODULE_LICENSE("Dual BSD/GPL");
52
53 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
54 int ipoib_debug_level;
55
56 module_param_named(debug_level, ipoib_debug_level, int, 0644);
57 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
58 #endif
59
60 static const u8 ipv4_bcast_addr[] = {
61         0x00, 0xff, 0xff, 0xff,
62         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
63         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
64 };
65
66 struct workqueue_struct *ipoib_workqueue;
67
68 static void ipoib_add_one(struct ib_device *device);
69 static void ipoib_remove_one(struct ib_device *device);
70
71 static struct ib_client ipoib_client = {
72         .name   = "ipoib",
73         .add    = ipoib_add_one,
74         .remove = ipoib_remove_one
75 };
76
77 int ipoib_open(struct net_device *dev)
78 {
79         struct ipoib_dev_priv *priv = netdev_priv(dev);
80
81         ipoib_dbg(priv, "bringing up interface\n");
82
83         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
84
85         if (ipoib_pkey_dev_delay_open(dev))
86                 return 0;
87
88         if (ipoib_ib_dev_open(dev))
89                 return -EINVAL;
90
91         if (ipoib_ib_dev_up(dev))
92                 return -EINVAL;
93
94         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
95                 struct ipoib_dev_priv *cpriv;
96
97                 /* Bring up any child interfaces too */
98                 down(&priv->vlan_mutex);
99                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
100                         int flags;
101
102                         flags = cpriv->dev->flags;
103                         if (flags & IFF_UP)
104                                 continue;
105
106                         dev_change_flags(cpriv->dev, flags | IFF_UP);
107                 }
108                 up(&priv->vlan_mutex);
109         }
110
111         netif_start_queue(dev);
112
113         return 0;
114 }
115
116 static int ipoib_stop(struct net_device *dev)
117 {
118         struct ipoib_dev_priv *priv = netdev_priv(dev);
119
120         ipoib_dbg(priv, "stopping interface\n");
121
122         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
123
124         netif_stop_queue(dev);
125
126         ipoib_ib_dev_down(dev);
127         ipoib_ib_dev_stop(dev);
128
129         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
130                 struct ipoib_dev_priv *cpriv;
131
132                 /* Bring down any child interfaces too */
133                 down(&priv->vlan_mutex);
134                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
135                         int flags;
136
137                         flags = cpriv->dev->flags;
138                         if (!(flags & IFF_UP))
139                                 continue;
140
141                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
142                 }
143                 up(&priv->vlan_mutex);
144         }
145
146         return 0;
147 }
148
149 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
150 {
151         struct ipoib_dev_priv *priv = netdev_priv(dev);
152
153         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
154                 return -EINVAL;
155
156         priv->admin_mtu = new_mtu;
157
158         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
159
160         return 0;
161 }
162
163 static struct ipoib_path *__path_find(struct net_device *dev,
164                                       union ib_gid *gid)
165 {
166         struct ipoib_dev_priv *priv = netdev_priv(dev);
167         struct rb_node *n = priv->path_tree.rb_node;
168         struct ipoib_path *path;
169         int ret;
170
171         while (n) {
172                 path = rb_entry(n, struct ipoib_path, rb_node);
173
174                 ret = memcmp(gid->raw, path->pathrec.dgid.raw,
175                              sizeof (union ib_gid));
176
177                 if (ret < 0)
178                         n = n->rb_left;
179                 else if (ret > 0)
180                         n = n->rb_right;
181                 else
182                         return path;
183         }
184
185         return NULL;
186 }
187
188 static int __path_add(struct net_device *dev, struct ipoib_path *path)
189 {
190         struct ipoib_dev_priv *priv = netdev_priv(dev);
191         struct rb_node **n = &priv->path_tree.rb_node;
192         struct rb_node *pn = NULL;
193         struct ipoib_path *tpath;
194         int ret;
195
196         while (*n) {
197                 pn = *n;
198                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
199
200                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
201                              sizeof (union ib_gid));
202                 if (ret < 0)
203                         n = &pn->rb_left;
204                 else if (ret > 0)
205                         n = &pn->rb_right;
206                 else
207                         return -EEXIST;
208         }
209
210         rb_link_node(&path->rb_node, pn, n);
211         rb_insert_color(&path->rb_node, &priv->path_tree);
212
213         list_add_tail(&path->list, &priv->path_list);
214
215         return 0;
216 }
217
218 static void path_free(struct net_device *dev, struct ipoib_path *path)
219 {
220         struct ipoib_dev_priv *priv = netdev_priv(dev);
221         struct ipoib_neigh *neigh, *tn;
222         struct sk_buff *skb;
223         unsigned long flags;
224
225         while ((skb = __skb_dequeue(&path->queue)))
226                 dev_kfree_skb_irq(skb);
227
228         spin_lock_irqsave(&priv->lock, flags);
229
230         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
231                 /*
232                  * It's safe to call ipoib_put_ah() inside priv->lock
233                  * here, because we know that path->ah will always
234                  * hold one more reference, so ipoib_put_ah() will
235                  * never do more than decrement the ref count.
236                  */
237                 if (neigh->ah)
238                         ipoib_put_ah(neigh->ah);
239                 *to_ipoib_neigh(neigh->neighbour) = NULL;
240                 neigh->neighbour->ops->destructor = NULL;
241                 kfree(neigh);
242         }
243
244         spin_unlock_irqrestore(&priv->lock, flags);
245
246         if (path->ah)
247                 ipoib_put_ah(path->ah);
248
249         kfree(path);
250 }
251
252 void ipoib_flush_paths(struct net_device *dev)
253 {
254         struct ipoib_dev_priv *priv = netdev_priv(dev);
255         struct ipoib_path *path, *tp;
256         LIST_HEAD(remove_list);
257         unsigned long flags;
258
259         spin_lock_irqsave(&priv->lock, flags);
260
261         list_splice(&priv->path_list, &remove_list);
262         INIT_LIST_HEAD(&priv->path_list);
263
264         list_for_each_entry(path, &remove_list, list)
265                 rb_erase(&path->rb_node, &priv->path_tree);
266
267         spin_unlock_irqrestore(&priv->lock, flags);
268
269         list_for_each_entry_safe(path, tp, &remove_list, list) {
270                 if (path->query)
271                         ib_sa_cancel_query(path->query_id, path->query);
272                 wait_for_completion(&path->done);
273                 path_free(dev, path);
274         }
275 }
276
277 static void path_rec_completion(int status,
278                                 struct ib_sa_path_rec *pathrec,
279                                 void *path_ptr)
280 {
281         struct ipoib_path *path = path_ptr;
282         struct net_device *dev = path->dev;
283         struct ipoib_dev_priv *priv = netdev_priv(dev);
284         struct ipoib_ah *ah = NULL;
285         struct ipoib_neigh *neigh;
286         struct sk_buff_head skqueue;
287         struct sk_buff *skb;
288         unsigned long flags;
289
290         if (pathrec)
291                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
292                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
293         else
294                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
295                           status, IPOIB_GID_ARG(path->pathrec.dgid));
296
297         skb_queue_head_init(&skqueue);
298
299         if (!status) {
300                 struct ib_ah_attr av = {
301                         .dlid          = be16_to_cpu(pathrec->dlid),
302                         .sl            = pathrec->sl,
303                         .port_num      = priv->port
304                 };
305                 int path_rate = ib_sa_rate_enum_to_int(pathrec->rate);
306
307                 if (path_rate > 0 && priv->local_rate > path_rate)
308                         av.static_rate = (priv->local_rate - 1) / path_rate;
309
310                 ipoib_dbg(priv, "static_rate %d for local port %dX, path %dX\n",
311                           av.static_rate, priv->local_rate,
312                           ib_sa_rate_enum_to_int(pathrec->rate));
313
314                 ah = ipoib_create_ah(dev, priv->pd, &av);
315         }
316
317         spin_lock_irqsave(&priv->lock, flags);
318
319         path->ah = ah;
320
321         if (ah) {
322                 path->pathrec = *pathrec;
323
324                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
325                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
326
327                 while ((skb = __skb_dequeue(&path->queue)))
328                         __skb_queue_tail(&skqueue, skb);
329
330                 list_for_each_entry(neigh, &path->neigh_list, list) {
331                         kref_get(&path->ah->ref);
332                         neigh->ah = path->ah;
333
334                         while ((skb = __skb_dequeue(&neigh->queue)))
335                                 __skb_queue_tail(&skqueue, skb);
336                 }
337         } else
338                 path->query = NULL;
339
340         complete(&path->done);
341
342         spin_unlock_irqrestore(&priv->lock, flags);
343
344         while ((skb = __skb_dequeue(&skqueue))) {
345                 skb->dev = dev;
346                 if (dev_queue_xmit(skb))
347                         ipoib_warn(priv, "dev_queue_xmit failed "
348                                    "to requeue packet\n");
349         }
350 }
351
352 static struct ipoib_path *path_rec_create(struct net_device *dev,
353                                           union ib_gid *gid)
354 {
355         struct ipoib_dev_priv *priv = netdev_priv(dev);
356         struct ipoib_path *path;
357
358         path = kmalloc(sizeof *path, GFP_ATOMIC);
359         if (!path)
360                 return NULL;
361
362         path->dev          = dev;
363         path->pathrec.dlid = 0;
364         path->ah           = NULL;
365
366         skb_queue_head_init(&path->queue);
367
368         INIT_LIST_HEAD(&path->neigh_list);
369         path->query = NULL;
370         init_completion(&path->done);
371
372         memcpy(path->pathrec.dgid.raw, gid->raw, sizeof (union ib_gid));
373         path->pathrec.sgid      = priv->local_gid;
374         path->pathrec.pkey      = cpu_to_be16(priv->pkey);
375         path->pathrec.numb_path = 1;
376
377         return path;
378 }
379
380 static int path_rec_start(struct net_device *dev,
381                           struct ipoib_path *path)
382 {
383         struct ipoib_dev_priv *priv = netdev_priv(dev);
384
385         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
386                   IPOIB_GID_ARG(path->pathrec.dgid));
387
388         path->query_id =
389                 ib_sa_path_rec_get(priv->ca, priv->port,
390                                    &path->pathrec,
391                                    IB_SA_PATH_REC_DGID          |
392                                    IB_SA_PATH_REC_SGID          |
393                                    IB_SA_PATH_REC_NUMB_PATH     |
394                                    IB_SA_PATH_REC_PKEY,
395                                    1000, GFP_ATOMIC,
396                                    path_rec_completion,
397                                    path, &path->query);
398         if (path->query_id < 0) {
399                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
400                 path->query = NULL;
401                 return path->query_id;
402         }
403
404         return 0;
405 }
406
407 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
408 {
409         struct ipoib_dev_priv *priv = netdev_priv(dev);
410         struct ipoib_path *path;
411         struct ipoib_neigh *neigh;
412
413         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
414         if (!neigh) {
415                 ++priv->stats.tx_dropped;
416                 dev_kfree_skb_any(skb);
417                 return;
418         }
419
420         skb_queue_head_init(&neigh->queue);
421         neigh->neighbour = skb->dst->neighbour;
422         *to_ipoib_neigh(skb->dst->neighbour) = neigh;
423
424         /*
425          * We can only be called from ipoib_start_xmit, so we're
426          * inside tx_lock -- no need to save/restore flags.
427          */
428         spin_lock(&priv->lock);
429
430         path = __path_find(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4));
431         if (!path) {
432                 path = path_rec_create(dev,
433                                        (union ib_gid *) (skb->dst->neighbour->ha + 4));
434                 if (!path)
435                         goto err;
436
437                 __path_add(dev, path);
438         }
439
440         list_add_tail(&neigh->list, &path->neigh_list);
441
442         if (path->pathrec.dlid) {
443                 kref_get(&path->ah->ref);
444                 neigh->ah = path->ah;
445
446                 ipoib_send(dev, skb, path->ah,
447                            be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
448         } else {
449                 neigh->ah  = NULL;
450                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
451                         __skb_queue_tail(&neigh->queue, skb);
452                 } else {
453                         ++priv->stats.tx_dropped;
454                         dev_kfree_skb_any(skb);
455                 }
456
457                 if (!path->query && path_rec_start(dev, path))
458                         goto err;
459         }
460
461         spin_unlock(&priv->lock);
462         return;
463
464 err:
465         *to_ipoib_neigh(skb->dst->neighbour) = NULL;
466         list_del(&neigh->list);
467         neigh->neighbour->ops->destructor = NULL;
468         kfree(neigh);
469
470         ++priv->stats.tx_dropped;
471         dev_kfree_skb_any(skb);
472
473         spin_unlock(&priv->lock);
474 }
475
476 static void path_lookup(struct sk_buff *skb, struct net_device *dev)
477 {
478         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
479
480         /* Look up path record for unicasts */
481         if (skb->dst->neighbour->ha[4] != 0xff) {
482                 neigh_add_path(skb, dev);
483                 return;
484         }
485
486         /* Add in the P_Key for multicasts */
487         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
488         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
489         ipoib_mcast_send(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4), skb);
490 }
491
492 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
493                              struct ipoib_pseudoheader *phdr)
494 {
495         struct ipoib_dev_priv *priv = netdev_priv(dev);
496         struct ipoib_path *path;
497
498         /*
499          * We can only be called from ipoib_start_xmit, so we're
500          * inside tx_lock -- no need to save/restore flags.
501          */
502         spin_lock(&priv->lock);
503
504         path = __path_find(dev, (union ib_gid *) (phdr->hwaddr + 4));
505         if (!path) {
506                 path = path_rec_create(dev,
507                                        (union ib_gid *) (phdr->hwaddr + 4));
508                 if (path) {
509                         /* put pseudoheader back on for next time */
510                         skb_push(skb, sizeof *phdr);
511                         __skb_queue_tail(&path->queue, skb);
512
513                         if (path_rec_start(dev, path)) {
514                                 spin_unlock(&priv->lock);
515                                 path_free(dev, path);
516                                 return;
517                         } else
518                                 __path_add(dev, path);
519                 } else {
520                         ++priv->stats.tx_dropped;
521                         dev_kfree_skb_any(skb);
522                 }
523
524                 spin_unlock(&priv->lock);
525                 return;
526         }
527
528         if (path->pathrec.dlid) {
529                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
530                           be16_to_cpu(path->pathrec.dlid));
531
532                 ipoib_send(dev, skb, path->ah,
533                            be32_to_cpup((__be32 *) phdr->hwaddr));
534         } else if ((path->query || !path_rec_start(dev, path)) &&
535                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
536                 /* put pseudoheader back on for next time */
537                 skb_push(skb, sizeof *phdr);
538                 __skb_queue_tail(&path->queue, skb);
539         } else {
540                 ++priv->stats.tx_dropped;
541                 dev_kfree_skb_any(skb);
542         }
543
544         spin_unlock(&priv->lock);
545 }
546
547 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
548 {
549         struct ipoib_dev_priv *priv = netdev_priv(dev);
550         struct ipoib_neigh *neigh;
551         unsigned long flags;
552
553         local_irq_save(flags);
554         if (!spin_trylock(&priv->tx_lock)) {
555                 local_irq_restore(flags);
556                 return NETDEV_TX_LOCKED;
557         }
558
559         /*
560          * Check if our queue is stopped.  Since we have the LLTX bit
561          * set, we can't rely on netif_stop_queue() preventing our
562          * xmit function from being called with a full queue.
563          */
564         if (unlikely(netif_queue_stopped(dev))) {
565                 spin_unlock_irqrestore(&priv->tx_lock, flags);
566                 return NETDEV_TX_BUSY;
567         }
568
569         if (skb->dst && skb->dst->neighbour) {
570                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
571                         path_lookup(skb, dev);
572                         goto out;
573                 }
574
575                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
576
577                 if (likely(neigh->ah)) {
578                         ipoib_send(dev, skb, neigh->ah,
579                                    be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
580                         goto out;
581                 }
582
583                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
584                         spin_lock(&priv->lock);
585                         __skb_queue_tail(&neigh->queue, skb);
586                         spin_unlock(&priv->lock);
587                 } else {
588                         ++priv->stats.tx_dropped;
589                         dev_kfree_skb_any(skb);
590                 }
591         } else {
592                 struct ipoib_pseudoheader *phdr =
593                         (struct ipoib_pseudoheader *) skb->data;
594                 skb_pull(skb, sizeof *phdr);
595
596                 if (phdr->hwaddr[4] == 0xff) {
597                         /* Add in the P_Key for multicast*/
598                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
599                         phdr->hwaddr[9] = priv->pkey & 0xff;
600
601                         ipoib_mcast_send(dev, (union ib_gid *) (phdr->hwaddr + 4), skb);
602                 } else {
603                         /* unicast GID -- should be ARP or RARP reply */
604
605                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
606                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
607                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
608                                            IPOIB_GID_FMT "\n",
609                                            skb->dst ? "neigh" : "dst",
610                                            be16_to_cpup((u16 *) skb->data),
611                                            be32_to_cpup((u32 *) phdr->hwaddr),
612                                            IPOIB_GID_ARG(*(union ib_gid *) (phdr->hwaddr + 4)));
613                                 dev_kfree_skb_any(skb);
614                                 ++priv->stats.tx_dropped;
615                                 goto out;
616                         }
617
618                         unicast_arp_send(skb, dev, phdr);
619                 }
620         }
621
622 out:
623         spin_unlock_irqrestore(&priv->tx_lock, flags);
624
625         return NETDEV_TX_OK;
626 }
627
628 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
629 {
630         struct ipoib_dev_priv *priv = netdev_priv(dev);
631
632         return &priv->stats;
633 }
634
635 static void ipoib_timeout(struct net_device *dev)
636 {
637         struct ipoib_dev_priv *priv = netdev_priv(dev);
638
639         ipoib_warn(priv, "transmit timeout: latency %ld\n",
640                    jiffies - dev->trans_start);
641         /* XXX reset QP, etc. */
642 }
643
644 static int ipoib_hard_header(struct sk_buff *skb,
645                              struct net_device *dev,
646                              unsigned short type,
647                              void *daddr, void *saddr, unsigned len)
648 {
649         struct ipoib_header *header;
650
651         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
652
653         header->proto = htons(type);
654         header->reserved = 0;
655
656         /*
657          * If we don't have a neighbour structure, stuff the
658          * destination address onto the front of the skb so we can
659          * figure out where to send the packet later.
660          */
661         if (!skb->dst || !skb->dst->neighbour) {
662                 struct ipoib_pseudoheader *phdr =
663                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
664                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
665         }
666
667         return 0;
668 }
669
670 static void ipoib_set_mcast_list(struct net_device *dev)
671 {
672         struct ipoib_dev_priv *priv = netdev_priv(dev);
673
674         schedule_work(&priv->restart_task);
675 }
676
677 static void ipoib_neigh_destructor(struct neighbour *n)
678 {
679         struct ipoib_neigh *neigh;
680         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
681         unsigned long flags;
682         struct ipoib_ah *ah = NULL;
683
684         ipoib_dbg(priv,
685                   "neigh_destructor for %06x " IPOIB_GID_FMT "\n",
686                   be32_to_cpup((__be32 *) n->ha),
687                   IPOIB_GID_ARG(*((union ib_gid *) (n->ha + 4))));
688
689         spin_lock_irqsave(&priv->lock, flags);
690
691         neigh = *to_ipoib_neigh(n);
692         if (neigh) {
693                 if (neigh->ah)
694                         ah = neigh->ah;
695                 list_del(&neigh->list);
696                 *to_ipoib_neigh(n) = NULL;
697                 kfree(neigh);
698         }
699
700         spin_unlock_irqrestore(&priv->lock, flags);
701
702         if (ah)
703                 ipoib_put_ah(ah);
704 }
705
706 static int ipoib_neigh_setup(struct neighbour *neigh)
707 {
708         /*
709          * Is this kosher?  I can't find anybody in the kernel that
710          * sets neigh->destructor, so we should be able to set it here
711          * without trouble.
712          */
713         neigh->ops->destructor = ipoib_neigh_destructor;
714
715         return 0;
716 }
717
718 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
719 {
720         parms->neigh_setup = ipoib_neigh_setup;
721
722         return 0;
723 }
724
725 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
726 {
727         struct ipoib_dev_priv *priv = netdev_priv(dev);
728
729         /* Allocate RX/TX "rings" to hold queued skbs */
730
731         priv->rx_ring = kmalloc(IPOIB_RX_RING_SIZE * sizeof (struct ipoib_buf),
732                                 GFP_KERNEL);
733         if (!priv->rx_ring) {
734                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
735                        ca->name, IPOIB_RX_RING_SIZE);
736                 goto out;
737         }
738         memset(priv->rx_ring, 0,
739                IPOIB_RX_RING_SIZE * sizeof (struct ipoib_buf));
740
741         priv->tx_ring = kmalloc(IPOIB_TX_RING_SIZE * sizeof (struct ipoib_buf),
742                                 GFP_KERNEL);
743         if (!priv->tx_ring) {
744                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
745                        ca->name, IPOIB_TX_RING_SIZE);
746                 goto out_rx_ring_cleanup;
747         }
748         memset(priv->tx_ring, 0,
749                IPOIB_TX_RING_SIZE * sizeof (struct ipoib_buf));
750
751         /* priv->tx_head & tx_tail are already 0 */
752
753         if (ipoib_ib_dev_init(dev, ca, port))
754                 goto out_tx_ring_cleanup;
755
756         return 0;
757
758 out_tx_ring_cleanup:
759         kfree(priv->tx_ring);
760
761 out_rx_ring_cleanup:
762         kfree(priv->rx_ring);
763
764 out:
765         return -ENOMEM;
766 }
767
768 void ipoib_dev_cleanup(struct net_device *dev)
769 {
770         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
771
772         ipoib_delete_debug_file(dev);
773
774         /* Delete any child interfaces first */
775         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
776                 unregister_netdev(cpriv->dev);
777                 ipoib_dev_cleanup(cpriv->dev);
778                 free_netdev(cpriv->dev);
779         }
780
781         ipoib_ib_dev_cleanup(dev);
782
783         if (priv->rx_ring) {
784                 kfree(priv->rx_ring);
785                 priv->rx_ring = NULL;
786         }
787
788         if (priv->tx_ring) {
789                 kfree(priv->tx_ring);
790                 priv->tx_ring = NULL;
791         }
792 }
793
794 static void ipoib_setup(struct net_device *dev)
795 {
796         struct ipoib_dev_priv *priv = netdev_priv(dev);
797
798         dev->open                = ipoib_open;
799         dev->stop                = ipoib_stop;
800         dev->change_mtu          = ipoib_change_mtu;
801         dev->hard_start_xmit     = ipoib_start_xmit;
802         dev->get_stats           = ipoib_get_stats;
803         dev->tx_timeout          = ipoib_timeout;
804         dev->hard_header         = ipoib_hard_header;
805         dev->set_multicast_list  = ipoib_set_mcast_list;
806         dev->neigh_setup         = ipoib_neigh_setup_dev;
807
808         dev->watchdog_timeo      = HZ;
809
810         dev->rebuild_header      = NULL;
811         dev->set_mac_address     = NULL;
812         dev->header_cache_update = NULL;
813
814         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
815
816         /*
817          * We add in INFINIBAND_ALEN to allow for the destination
818          * address "pseudoheader" for skbs without neighbour struct.
819          */
820         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
821         dev->addr_len            = INFINIBAND_ALEN;
822         dev->type                = ARPHRD_INFINIBAND;
823         dev->tx_queue_len        = IPOIB_TX_RING_SIZE * 2;
824         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
825
826         /* MTU will be reset when mcast join happens */
827         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
828         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
829
830         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
831
832         netif_carrier_off(dev);
833
834         SET_MODULE_OWNER(dev);
835
836         priv->dev = dev;
837
838         spin_lock_init(&priv->lock);
839         spin_lock_init(&priv->tx_lock);
840
841         init_MUTEX(&priv->mcast_mutex);
842         init_MUTEX(&priv->vlan_mutex);
843
844         INIT_LIST_HEAD(&priv->path_list);
845         INIT_LIST_HEAD(&priv->child_intfs);
846         INIT_LIST_HEAD(&priv->dead_ahs);
847         INIT_LIST_HEAD(&priv->multicast_list);
848
849         INIT_WORK(&priv->pkey_task,    ipoib_pkey_poll,          priv->dev);
850         INIT_WORK(&priv->mcast_task,   ipoib_mcast_join_task,    priv->dev);
851         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush,       priv->dev);
852         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task, priv->dev);
853         INIT_WORK(&priv->ah_reap_task, ipoib_reap_ah,            priv->dev);
854 }
855
856 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
857 {
858         struct net_device *dev;
859
860         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
861                            ipoib_setup);
862         if (!dev)
863                 return NULL;
864
865         return netdev_priv(dev);
866 }
867
868 static ssize_t show_pkey(struct class_device *cdev, char *buf)
869 {
870         struct ipoib_dev_priv *priv =
871                 netdev_priv(container_of(cdev, struct net_device, class_dev));
872
873         return sprintf(buf, "0x%04x\n", priv->pkey);
874 }
875 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
876
877 static ssize_t create_child(struct class_device *cdev,
878                             const char *buf, size_t count)
879 {
880         int pkey;
881         int ret;
882
883         if (sscanf(buf, "%i", &pkey) != 1)
884                 return -EINVAL;
885
886         if (pkey < 0 || pkey > 0xffff)
887                 return -EINVAL;
888
889         ret = ipoib_vlan_add(container_of(cdev, struct net_device, class_dev),
890                              pkey);
891
892         return ret ? ret : count;
893 }
894 static CLASS_DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
895
896 static ssize_t delete_child(struct class_device *cdev,
897                             const char *buf, size_t count)
898 {
899         int pkey;
900         int ret;
901
902         if (sscanf(buf, "%i", &pkey) != 1)
903                 return -EINVAL;
904
905         if (pkey < 0 || pkey > 0xffff)
906                 return -EINVAL;
907
908         ret = ipoib_vlan_delete(container_of(cdev, struct net_device, class_dev),
909                                 pkey);
910
911         return ret ? ret : count;
912
913 }
914 static CLASS_DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
915
916 int ipoib_add_pkey_attr(struct net_device *dev)
917 {
918         return class_device_create_file(&dev->class_dev,
919                                         &class_device_attr_pkey);
920 }
921
922 static struct net_device *ipoib_add_port(const char *format,
923                                          struct ib_device *hca, u8 port)
924 {
925         struct ipoib_dev_priv *priv;
926         int result = -ENOMEM;
927
928         priv = ipoib_intf_alloc(format);
929         if (!priv)
930                 goto alloc_mem_failed;
931
932         SET_NETDEV_DEV(priv->dev, hca->dma_device);
933
934         result = ib_query_pkey(hca, port, 0, &priv->pkey);
935         if (result) {
936                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
937                        hca->name, port, result);
938                 goto alloc_mem_failed;
939         }
940
941         priv->dev->broadcast[8] = priv->pkey >> 8;
942         priv->dev->broadcast[9] = priv->pkey & 0xff;
943
944         result = ib_query_gid(hca, port, 0, &priv->local_gid);
945         if (result) {
946                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
947                        hca->name, port, result);
948                 goto alloc_mem_failed;
949         } else
950                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
951
952
953         result = ipoib_dev_init(priv->dev, hca, port);
954         if (result < 0) {
955                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
956                        hca->name, port, result);
957                 goto device_init_failed;
958         }
959
960         INIT_IB_EVENT_HANDLER(&priv->event_handler,
961                               priv->ca, ipoib_event);
962         result = ib_register_event_handler(&priv->event_handler);
963         if (result < 0) {
964                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
965                        "port %d (ret = %d)\n",
966                        hca->name, port, result);
967                 goto event_failed;
968         }
969
970         result = register_netdev(priv->dev);
971         if (result) {
972                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
973                        hca->name, port, result);
974                 goto register_failed;
975         }
976
977         if (ipoib_create_debug_file(priv->dev))
978                 goto debug_failed;
979
980         if (ipoib_add_pkey_attr(priv->dev))
981                 goto sysfs_failed;
982         if (class_device_create_file(&priv->dev->class_dev,
983                                      &class_device_attr_create_child))
984                 goto sysfs_failed;
985         if (class_device_create_file(&priv->dev->class_dev,
986                                      &class_device_attr_delete_child))
987                 goto sysfs_failed;
988
989         return priv->dev;
990
991 sysfs_failed:
992         ipoib_delete_debug_file(priv->dev);
993
994 debug_failed:
995         unregister_netdev(priv->dev);
996
997 register_failed:
998         ib_unregister_event_handler(&priv->event_handler);
999
1000 event_failed:
1001         ipoib_dev_cleanup(priv->dev);
1002
1003 device_init_failed:
1004         free_netdev(priv->dev);
1005
1006 alloc_mem_failed:
1007         return ERR_PTR(result);
1008 }
1009
1010 static void ipoib_add_one(struct ib_device *device)
1011 {
1012         struct list_head *dev_list;
1013         struct net_device *dev;
1014         struct ipoib_dev_priv *priv;
1015         int s, e, p;
1016
1017         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1018         if (!dev_list)
1019                 return;
1020
1021         INIT_LIST_HEAD(dev_list);
1022
1023         if (device->node_type == IB_NODE_SWITCH) {
1024                 s = 0;
1025                 e = 0;
1026         } else {
1027                 s = 1;
1028                 e = device->phys_port_cnt;
1029         }
1030
1031         for (p = s; p <= e; ++p) {
1032                 dev = ipoib_add_port("ib%d", device, p);
1033                 if (!IS_ERR(dev)) {
1034                         priv = netdev_priv(dev);
1035                         list_add_tail(&priv->list, dev_list);
1036                 }
1037         }
1038
1039         ib_set_client_data(device, &ipoib_client, dev_list);
1040 }
1041
1042 static void ipoib_remove_one(struct ib_device *device)
1043 {
1044         struct ipoib_dev_priv *priv, *tmp;
1045         struct list_head *dev_list;
1046
1047         dev_list = ib_get_client_data(device, &ipoib_client);
1048
1049         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1050                 ib_unregister_event_handler(&priv->event_handler);
1051
1052                 unregister_netdev(priv->dev);
1053                 ipoib_dev_cleanup(priv->dev);
1054                 free_netdev(priv->dev);
1055         }
1056 }
1057
1058 static int __init ipoib_init_module(void)
1059 {
1060         int ret;
1061
1062         ret = ipoib_register_debugfs();
1063         if (ret)
1064                 return ret;
1065
1066         /*
1067          * We create our own workqueue mainly because we want to be
1068          * able to flush it when devices are being removed.  We can't
1069          * use schedule_work()/flush_scheduled_work() because both
1070          * unregister_netdev() and linkwatch_event take the rtnl lock,
1071          * so flush_scheduled_work() can deadlock during device
1072          * removal.
1073          */
1074         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1075         if (!ipoib_workqueue) {
1076                 ret = -ENOMEM;
1077                 goto err_fs;
1078         }
1079
1080         ret = ib_register_client(&ipoib_client);
1081         if (ret)
1082                 goto err_wq;
1083
1084         return 0;
1085
1086 err_wq:
1087         destroy_workqueue(ipoib_workqueue);
1088
1089 err_fs:
1090         ipoib_unregister_debugfs();
1091
1092         return ret;
1093 }
1094
1095 static void __exit ipoib_cleanup_module(void)
1096 {
1097         ib_unregister_client(&ipoib_client);
1098         ipoib_unregister_debugfs();
1099         destroy_workqueue(ipoib_workqueue);
1100 }
1101
1102 module_init(ipoib_init_module);
1103 module_exit(ipoib_cleanup_module);