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