[PATCH] ARM: Fix ARM fault handler for get_user_pages() fixes.
[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 reply */
604
605                         if (be16_to_cpup((u16 *) skb->data) != ETH_P_ARP) {
606                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
607                                            IPOIB_GID_FMT "\n",
608                                            skb->dst ? "neigh" : "dst",
609                                            be16_to_cpup((u16 *) skb->data),
610                                            be32_to_cpup((u32 *) phdr->hwaddr),
611                                            IPOIB_GID_ARG(*(union ib_gid *) (phdr->hwaddr + 4)));
612                                 dev_kfree_skb_any(skb);
613                                 ++priv->stats.tx_dropped;
614                                 goto out;
615                         }
616
617                         unicast_arp_send(skb, dev, phdr);
618                 }
619         }
620
621 out:
622         spin_unlock_irqrestore(&priv->tx_lock, flags);
623
624         return NETDEV_TX_OK;
625 }
626
627 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
628 {
629         struct ipoib_dev_priv *priv = netdev_priv(dev);
630
631         return &priv->stats;
632 }
633
634 static void ipoib_timeout(struct net_device *dev)
635 {
636         struct ipoib_dev_priv *priv = netdev_priv(dev);
637
638         ipoib_warn(priv, "transmit timeout: latency %ld\n",
639                    jiffies - dev->trans_start);
640         /* XXX reset QP, etc. */
641 }
642
643 static int ipoib_hard_header(struct sk_buff *skb,
644                              struct net_device *dev,
645                              unsigned short type,
646                              void *daddr, void *saddr, unsigned len)
647 {
648         struct ipoib_header *header;
649
650         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
651
652         header->proto = htons(type);
653         header->reserved = 0;
654
655         /*
656          * If we don't have a neighbour structure, stuff the
657          * destination address onto the front of the skb so we can
658          * figure out where to send the packet later.
659          */
660         if (!skb->dst || !skb->dst->neighbour) {
661                 struct ipoib_pseudoheader *phdr =
662                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
663                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
664         }
665
666         return 0;
667 }
668
669 static void ipoib_set_mcast_list(struct net_device *dev)
670 {
671         struct ipoib_dev_priv *priv = netdev_priv(dev);
672
673         schedule_work(&priv->restart_task);
674 }
675
676 static void ipoib_neigh_destructor(struct neighbour *n)
677 {
678         struct ipoib_neigh *neigh;
679         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
680         unsigned long flags;
681         struct ipoib_ah *ah = NULL;
682
683         ipoib_dbg(priv,
684                   "neigh_destructor for %06x " IPOIB_GID_FMT "\n",
685                   be32_to_cpup((__be32 *) n->ha),
686                   IPOIB_GID_ARG(*((union ib_gid *) (n->ha + 4))));
687
688         spin_lock_irqsave(&priv->lock, flags);
689
690         neigh = *to_ipoib_neigh(n);
691         if (neigh) {
692                 if (neigh->ah)
693                         ah = neigh->ah;
694                 list_del(&neigh->list);
695                 *to_ipoib_neigh(n) = NULL;
696                 kfree(neigh);
697         }
698
699         spin_unlock_irqrestore(&priv->lock, flags);
700
701         if (ah)
702                 ipoib_put_ah(ah);
703 }
704
705 static int ipoib_neigh_setup(struct neighbour *neigh)
706 {
707         /*
708          * Is this kosher?  I can't find anybody in the kernel that
709          * sets neigh->destructor, so we should be able to set it here
710          * without trouble.
711          */
712         neigh->ops->destructor = ipoib_neigh_destructor;
713
714         return 0;
715 }
716
717 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
718 {
719         parms->neigh_setup = ipoib_neigh_setup;
720
721         return 0;
722 }
723
724 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
725 {
726         struct ipoib_dev_priv *priv = netdev_priv(dev);
727
728         /* Allocate RX/TX "rings" to hold queued skbs */
729
730         priv->rx_ring = kmalloc(IPOIB_RX_RING_SIZE * sizeof (struct ipoib_buf),
731                                 GFP_KERNEL);
732         if (!priv->rx_ring) {
733                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
734                        ca->name, IPOIB_RX_RING_SIZE);
735                 goto out;
736         }
737         memset(priv->rx_ring, 0,
738                IPOIB_RX_RING_SIZE * sizeof (struct ipoib_buf));
739
740         priv->tx_ring = kmalloc(IPOIB_TX_RING_SIZE * sizeof (struct ipoib_buf),
741                                 GFP_KERNEL);
742         if (!priv->tx_ring) {
743                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
744                        ca->name, IPOIB_TX_RING_SIZE);
745                 goto out_rx_ring_cleanup;
746         }
747         memset(priv->tx_ring, 0,
748                IPOIB_TX_RING_SIZE * sizeof (struct ipoib_buf));
749
750         /* priv->tx_head & tx_tail are already 0 */
751
752         if (ipoib_ib_dev_init(dev, ca, port))
753                 goto out_tx_ring_cleanup;
754
755         return 0;
756
757 out_tx_ring_cleanup:
758         kfree(priv->tx_ring);
759
760 out_rx_ring_cleanup:
761         kfree(priv->rx_ring);
762
763 out:
764         return -ENOMEM;
765 }
766
767 void ipoib_dev_cleanup(struct net_device *dev)
768 {
769         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
770
771         ipoib_delete_debug_file(dev);
772
773         /* Delete any child interfaces first */
774         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
775                 unregister_netdev(cpriv->dev);
776                 ipoib_dev_cleanup(cpriv->dev);
777                 free_netdev(cpriv->dev);
778         }
779
780         ipoib_ib_dev_cleanup(dev);
781
782         if (priv->rx_ring) {
783                 kfree(priv->rx_ring);
784                 priv->rx_ring = NULL;
785         }
786
787         if (priv->tx_ring) {
788                 kfree(priv->tx_ring);
789                 priv->tx_ring = NULL;
790         }
791 }
792
793 static void ipoib_setup(struct net_device *dev)
794 {
795         struct ipoib_dev_priv *priv = netdev_priv(dev);
796
797         dev->open                = ipoib_open;
798         dev->stop                = ipoib_stop;
799         dev->change_mtu          = ipoib_change_mtu;
800         dev->hard_start_xmit     = ipoib_start_xmit;
801         dev->get_stats           = ipoib_get_stats;
802         dev->tx_timeout          = ipoib_timeout;
803         dev->hard_header         = ipoib_hard_header;
804         dev->set_multicast_list  = ipoib_set_mcast_list;
805         dev->neigh_setup         = ipoib_neigh_setup_dev;
806
807         dev->watchdog_timeo      = HZ;
808
809         dev->rebuild_header      = NULL;
810         dev->set_mac_address     = NULL;
811         dev->header_cache_update = NULL;
812
813         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
814
815         /*
816          * We add in INFINIBAND_ALEN to allow for the destination
817          * address "pseudoheader" for skbs without neighbour struct.
818          */
819         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
820         dev->addr_len            = INFINIBAND_ALEN;
821         dev->type                = ARPHRD_INFINIBAND;
822         dev->tx_queue_len        = IPOIB_TX_RING_SIZE * 2;
823         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
824
825         /* MTU will be reset when mcast join happens */
826         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
827         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
828
829         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
830
831         netif_carrier_off(dev);
832
833         SET_MODULE_OWNER(dev);
834
835         priv->dev = dev;
836
837         spin_lock_init(&priv->lock);
838         spin_lock_init(&priv->tx_lock);
839
840         init_MUTEX(&priv->mcast_mutex);
841         init_MUTEX(&priv->vlan_mutex);
842
843         INIT_LIST_HEAD(&priv->path_list);
844         INIT_LIST_HEAD(&priv->child_intfs);
845         INIT_LIST_HEAD(&priv->dead_ahs);
846         INIT_LIST_HEAD(&priv->multicast_list);
847
848         INIT_WORK(&priv->pkey_task,    ipoib_pkey_poll,          priv->dev);
849         INIT_WORK(&priv->mcast_task,   ipoib_mcast_join_task,    priv->dev);
850         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush,       priv->dev);
851         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task, priv->dev);
852         INIT_WORK(&priv->ah_reap_task, ipoib_reap_ah,            priv->dev);
853 }
854
855 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
856 {
857         struct net_device *dev;
858
859         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
860                            ipoib_setup);
861         if (!dev)
862                 return NULL;
863
864         return netdev_priv(dev);
865 }
866
867 static ssize_t show_pkey(struct class_device *cdev, char *buf)
868 {
869         struct ipoib_dev_priv *priv =
870                 netdev_priv(container_of(cdev, struct net_device, class_dev));
871
872         return sprintf(buf, "0x%04x\n", priv->pkey);
873 }
874 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
875
876 static ssize_t create_child(struct class_device *cdev,
877                             const char *buf, size_t count)
878 {
879         int pkey;
880         int ret;
881
882         if (sscanf(buf, "%i", &pkey) != 1)
883                 return -EINVAL;
884
885         if (pkey < 0 || pkey > 0xffff)
886                 return -EINVAL;
887
888         ret = ipoib_vlan_add(container_of(cdev, struct net_device, class_dev),
889                              pkey);
890
891         return ret ? ret : count;
892 }
893 static CLASS_DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
894
895 static ssize_t delete_child(struct class_device *cdev,
896                             const char *buf, size_t count)
897 {
898         int pkey;
899         int ret;
900
901         if (sscanf(buf, "%i", &pkey) != 1)
902                 return -EINVAL;
903
904         if (pkey < 0 || pkey > 0xffff)
905                 return -EINVAL;
906
907         ret = ipoib_vlan_delete(container_of(cdev, struct net_device, class_dev),
908                                 pkey);
909
910         return ret ? ret : count;
911
912 }
913 static CLASS_DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
914
915 int ipoib_add_pkey_attr(struct net_device *dev)
916 {
917         return class_device_create_file(&dev->class_dev,
918                                         &class_device_attr_pkey);
919 }
920
921 static struct net_device *ipoib_add_port(const char *format,
922                                          struct ib_device *hca, u8 port)
923 {
924         struct ipoib_dev_priv *priv;
925         int result = -ENOMEM;
926
927         priv = ipoib_intf_alloc(format);
928         if (!priv)
929                 goto alloc_mem_failed;
930
931         SET_NETDEV_DEV(priv->dev, hca->dma_device);
932
933         result = ib_query_pkey(hca, port, 0, &priv->pkey);
934         if (result) {
935                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
936                        hca->name, port, result);
937                 goto alloc_mem_failed;
938         }
939
940         priv->dev->broadcast[8] = priv->pkey >> 8;
941         priv->dev->broadcast[9] = priv->pkey & 0xff;
942
943         result = ib_query_gid(hca, port, 0, &priv->local_gid);
944         if (result) {
945                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
946                        hca->name, port, result);
947                 goto alloc_mem_failed;
948         } else
949                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
950
951
952         result = ipoib_dev_init(priv->dev, hca, port);
953         if (result < 0) {
954                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
955                        hca->name, port, result);
956                 goto device_init_failed;
957         }
958
959         INIT_IB_EVENT_HANDLER(&priv->event_handler,
960                               priv->ca, ipoib_event);
961         result = ib_register_event_handler(&priv->event_handler);
962         if (result < 0) {
963                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
964                        "port %d (ret = %d)\n",
965                        hca->name, port, result);
966                 goto event_failed;
967         }
968
969         result = register_netdev(priv->dev);
970         if (result) {
971                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
972                        hca->name, port, result);
973                 goto register_failed;
974         }
975
976         if (ipoib_create_debug_file(priv->dev))
977                 goto debug_failed;
978
979         if (ipoib_add_pkey_attr(priv->dev))
980                 goto sysfs_failed;
981         if (class_device_create_file(&priv->dev->class_dev,
982                                      &class_device_attr_create_child))
983                 goto sysfs_failed;
984         if (class_device_create_file(&priv->dev->class_dev,
985                                      &class_device_attr_delete_child))
986                 goto sysfs_failed;
987
988         return priv->dev;
989
990 sysfs_failed:
991         ipoib_delete_debug_file(priv->dev);
992
993 debug_failed:
994         unregister_netdev(priv->dev);
995
996 register_failed:
997         ib_unregister_event_handler(&priv->event_handler);
998
999 event_failed:
1000         ipoib_dev_cleanup(priv->dev);
1001
1002 device_init_failed:
1003         free_netdev(priv->dev);
1004
1005 alloc_mem_failed:
1006         return ERR_PTR(result);
1007 }
1008
1009 static void ipoib_add_one(struct ib_device *device)
1010 {
1011         struct list_head *dev_list;
1012         struct net_device *dev;
1013         struct ipoib_dev_priv *priv;
1014         int s, e, p;
1015
1016         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1017         if (!dev_list)
1018                 return;
1019
1020         INIT_LIST_HEAD(dev_list);
1021
1022         if (device->node_type == IB_NODE_SWITCH) {
1023                 s = 0;
1024                 e = 0;
1025         } else {
1026                 s = 1;
1027                 e = device->phys_port_cnt;
1028         }
1029
1030         for (p = s; p <= e; ++p) {
1031                 dev = ipoib_add_port("ib%d", device, p);
1032                 if (!IS_ERR(dev)) {
1033                         priv = netdev_priv(dev);
1034                         list_add_tail(&priv->list, dev_list);
1035                 }
1036         }
1037
1038         ib_set_client_data(device, &ipoib_client, dev_list);
1039 }
1040
1041 static void ipoib_remove_one(struct ib_device *device)
1042 {
1043         struct ipoib_dev_priv *priv, *tmp;
1044         struct list_head *dev_list;
1045
1046         dev_list = ib_get_client_data(device, &ipoib_client);
1047
1048         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1049                 ib_unregister_event_handler(&priv->event_handler);
1050
1051                 unregister_netdev(priv->dev);
1052                 ipoib_dev_cleanup(priv->dev);
1053                 free_netdev(priv->dev);
1054         }
1055 }
1056
1057 static int __init ipoib_init_module(void)
1058 {
1059         int ret;
1060
1061         ret = ipoib_register_debugfs();
1062         if (ret)
1063                 return ret;
1064
1065         /*
1066          * We create our own workqueue mainly because we want to be
1067          * able to flush it when devices are being removed.  We can't
1068          * use schedule_work()/flush_scheduled_work() because both
1069          * unregister_netdev() and linkwatch_event take the rtnl lock,
1070          * so flush_scheduled_work() can deadlock during device
1071          * removal.
1072          */
1073         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1074         if (!ipoib_workqueue) {
1075                 ret = -ENOMEM;
1076                 goto err_fs;
1077         }
1078
1079         ret = ib_register_client(&ipoib_client);
1080         if (ret)
1081                 goto err_wq;
1082
1083         return 0;
1084
1085 err_wq:
1086         destroy_workqueue(ipoib_workqueue);
1087
1088 err_fs:
1089         ipoib_unregister_debugfs();
1090
1091         return ret;
1092 }
1093
1094 static void __exit ipoib_cleanup_module(void)
1095 {
1096         ib_unregister_client(&ipoib_client);
1097         ipoib_unregister_debugfs();
1098         destroy_workqueue(ipoib_workqueue);
1099 }
1100
1101 module_init(ipoib_init_module);
1102 module_exit(ipoib_cleanup_module);