Merge branch 'mainline' into upstream-linus
[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/kernel.h>
44
45 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
46
47 #include <linux/ip.h>
48 #include <linux/in.h>
49
50 #include <net/dst.h>
51
52 MODULE_AUTHOR("Roland Dreier");
53 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
54 MODULE_LICENSE("Dual BSD/GPL");
55
56 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
57 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
58
59 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
60 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
61 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
62 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
63
64 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
65 int ipoib_debug_level;
66
67 module_param_named(debug_level, ipoib_debug_level, int, 0644);
68 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
69 #endif
70
71 struct ipoib_path_iter {
72         struct net_device *dev;
73         struct ipoib_path  path;
74 };
75
76 static const u8 ipv4_bcast_addr[] = {
77         0x00, 0xff, 0xff, 0xff,
78         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
79         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
80 };
81
82 struct workqueue_struct *ipoib_workqueue;
83
84 struct ib_sa_client ipoib_sa_client;
85
86 static void ipoib_add_one(struct ib_device *device);
87 static void ipoib_remove_one(struct ib_device *device);
88
89 static struct ib_client ipoib_client = {
90         .name   = "ipoib",
91         .add    = ipoib_add_one,
92         .remove = ipoib_remove_one
93 };
94
95 int ipoib_open(struct net_device *dev)
96 {
97         struct ipoib_dev_priv *priv = netdev_priv(dev);
98
99         ipoib_dbg(priv, "bringing up interface\n");
100
101         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
102
103         if (ipoib_pkey_dev_delay_open(dev))
104                 return 0;
105
106         if (ipoib_ib_dev_open(dev))
107                 return -EINVAL;
108
109         if (ipoib_ib_dev_up(dev)) {
110                 ipoib_ib_dev_stop(dev);
111                 return -EINVAL;
112         }
113
114         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
115                 struct ipoib_dev_priv *cpriv;
116
117                 /* Bring up any child interfaces too */
118                 mutex_lock(&priv->vlan_mutex);
119                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
120                         int flags;
121
122                         flags = cpriv->dev->flags;
123                         if (flags & IFF_UP)
124                                 continue;
125
126                         dev_change_flags(cpriv->dev, flags | IFF_UP);
127                 }
128                 mutex_unlock(&priv->vlan_mutex);
129         }
130
131         netif_start_queue(dev);
132
133         return 0;
134 }
135
136 static int ipoib_stop(struct net_device *dev)
137 {
138         struct ipoib_dev_priv *priv = netdev_priv(dev);
139
140         ipoib_dbg(priv, "stopping interface\n");
141
142         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
143
144         netif_stop_queue(dev);
145
146         /*
147          * Now flush workqueue to make sure a scheduled task doesn't
148          * bring our internal state back up.
149          */
150         flush_workqueue(ipoib_workqueue);
151
152         ipoib_ib_dev_down(dev, 1);
153         ipoib_ib_dev_stop(dev);
154
155         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
156                 struct ipoib_dev_priv *cpriv;
157
158                 /* Bring down any child interfaces too */
159                 mutex_lock(&priv->vlan_mutex);
160                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
161                         int flags;
162
163                         flags = cpriv->dev->flags;
164                         if (!(flags & IFF_UP))
165                                 continue;
166
167                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
168                 }
169                 mutex_unlock(&priv->vlan_mutex);
170         }
171
172         return 0;
173 }
174
175 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
176 {
177         struct ipoib_dev_priv *priv = netdev_priv(dev);
178
179         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
180                 return -EINVAL;
181
182         priv->admin_mtu = new_mtu;
183
184         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
185
186         return 0;
187 }
188
189 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
190 {
191         struct ipoib_dev_priv *priv = netdev_priv(dev);
192         struct rb_node *n = priv->path_tree.rb_node;
193         struct ipoib_path *path;
194         int ret;
195
196         while (n) {
197                 path = rb_entry(n, struct ipoib_path, rb_node);
198
199                 ret = memcmp(gid, path->pathrec.dgid.raw,
200                              sizeof (union ib_gid));
201
202                 if (ret < 0)
203                         n = n->rb_left;
204                 else if (ret > 0)
205                         n = n->rb_right;
206                 else
207                         return path;
208         }
209
210         return NULL;
211 }
212
213 static int __path_add(struct net_device *dev, struct ipoib_path *path)
214 {
215         struct ipoib_dev_priv *priv = netdev_priv(dev);
216         struct rb_node **n = &priv->path_tree.rb_node;
217         struct rb_node *pn = NULL;
218         struct ipoib_path *tpath;
219         int ret;
220
221         while (*n) {
222                 pn = *n;
223                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
224
225                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
226                              sizeof (union ib_gid));
227                 if (ret < 0)
228                         n = &pn->rb_left;
229                 else if (ret > 0)
230                         n = &pn->rb_right;
231                 else
232                         return -EEXIST;
233         }
234
235         rb_link_node(&path->rb_node, pn, n);
236         rb_insert_color(&path->rb_node, &priv->path_tree);
237
238         list_add_tail(&path->list, &priv->path_list);
239
240         return 0;
241 }
242
243 static void path_free(struct net_device *dev, struct ipoib_path *path)
244 {
245         struct ipoib_dev_priv *priv = netdev_priv(dev);
246         struct ipoib_neigh *neigh, *tn;
247         struct sk_buff *skb;
248         unsigned long flags;
249
250         while ((skb = __skb_dequeue(&path->queue)))
251                 dev_kfree_skb_irq(skb);
252
253         spin_lock_irqsave(&priv->lock, flags);
254
255         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
256                 /*
257                  * It's safe to call ipoib_put_ah() inside priv->lock
258                  * here, because we know that path->ah will always
259                  * hold one more reference, so ipoib_put_ah() will
260                  * never do more than decrement the ref count.
261                  */
262                 if (neigh->ah)
263                         ipoib_put_ah(neigh->ah);
264
265                 ipoib_neigh_free(neigh);
266         }
267
268         spin_unlock_irqrestore(&priv->lock, flags);
269
270         if (path->ah)
271                 ipoib_put_ah(path->ah);
272
273         kfree(path);
274 }
275
276 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
277
278 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
279 {
280         struct ipoib_path_iter *iter;
281
282         iter = kmalloc(sizeof *iter, GFP_KERNEL);
283         if (!iter)
284                 return NULL;
285
286         iter->dev = dev;
287         memset(iter->path.pathrec.dgid.raw, 0, 16);
288
289         if (ipoib_path_iter_next(iter)) {
290                 kfree(iter);
291                 return NULL;
292         }
293
294         return iter;
295 }
296
297 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
298 {
299         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
300         struct rb_node *n;
301         struct ipoib_path *path;
302         int ret = 1;
303
304         spin_lock_irq(&priv->lock);
305
306         n = rb_first(&priv->path_tree);
307
308         while (n) {
309                 path = rb_entry(n, struct ipoib_path, rb_node);
310
311                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
312                            sizeof (union ib_gid)) < 0) {
313                         iter->path = *path;
314                         ret = 0;
315                         break;
316                 }
317
318                 n = rb_next(n);
319         }
320
321         spin_unlock_irq(&priv->lock);
322
323         return ret;
324 }
325
326 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
327                           struct ipoib_path *path)
328 {
329         *path = iter->path;
330 }
331
332 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
333
334 void ipoib_flush_paths(struct net_device *dev)
335 {
336         struct ipoib_dev_priv *priv = netdev_priv(dev);
337         struct ipoib_path *path, *tp;
338         LIST_HEAD(remove_list);
339
340         spin_lock_irq(&priv->tx_lock);
341         spin_lock(&priv->lock);
342
343         list_splice(&priv->path_list, &remove_list);
344         INIT_LIST_HEAD(&priv->path_list);
345
346         list_for_each_entry(path, &remove_list, list)
347                 rb_erase(&path->rb_node, &priv->path_tree);
348
349         list_for_each_entry_safe(path, tp, &remove_list, list) {
350                 if (path->query)
351                         ib_sa_cancel_query(path->query_id, path->query);
352                 spin_unlock(&priv->lock);
353                 spin_unlock_irq(&priv->tx_lock);
354                 wait_for_completion(&path->done);
355                 path_free(dev, path);
356                 spin_lock_irq(&priv->tx_lock);
357                 spin_lock(&priv->lock);
358         }
359         spin_unlock(&priv->lock);
360         spin_unlock_irq(&priv->tx_lock);
361 }
362
363 static void path_rec_completion(int status,
364                                 struct ib_sa_path_rec *pathrec,
365                                 void *path_ptr)
366 {
367         struct ipoib_path *path = path_ptr;
368         struct net_device *dev = path->dev;
369         struct ipoib_dev_priv *priv = netdev_priv(dev);
370         struct ipoib_ah *ah = NULL;
371         struct ipoib_neigh *neigh;
372         struct sk_buff_head skqueue;
373         struct sk_buff *skb;
374         unsigned long flags;
375
376         if (pathrec)
377                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
378                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
379         else
380                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
381                           status, IPOIB_GID_ARG(path->pathrec.dgid));
382
383         skb_queue_head_init(&skqueue);
384
385         if (!status) {
386                 struct ib_ah_attr av = {
387                         .dlid          = be16_to_cpu(pathrec->dlid),
388                         .sl            = pathrec->sl,
389                         .port_num      = priv->port,
390                         .static_rate   = pathrec->rate
391                 };
392
393                 ah = ipoib_create_ah(dev, priv->pd, &av);
394         }
395
396         spin_lock_irqsave(&priv->lock, flags);
397
398         path->ah = ah;
399
400         if (ah) {
401                 path->pathrec = *pathrec;
402
403                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
404                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
405
406                 while ((skb = __skb_dequeue(&path->queue)))
407                         __skb_queue_tail(&skqueue, skb);
408
409                 list_for_each_entry(neigh, &path->neigh_list, list) {
410                         kref_get(&path->ah->ref);
411                         neigh->ah = path->ah;
412                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
413                                sizeof(union ib_gid));
414
415                         while ((skb = __skb_dequeue(&neigh->queue)))
416                                 __skb_queue_tail(&skqueue, skb);
417                 }
418         }
419
420         path->query = NULL;
421         complete(&path->done);
422
423         spin_unlock_irqrestore(&priv->lock, flags);
424
425         while ((skb = __skb_dequeue(&skqueue))) {
426                 skb->dev = dev;
427                 if (dev_queue_xmit(skb))
428                         ipoib_warn(priv, "dev_queue_xmit failed "
429                                    "to requeue packet\n");
430         }
431 }
432
433 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
434 {
435         struct ipoib_dev_priv *priv = netdev_priv(dev);
436         struct ipoib_path *path;
437
438         path = kzalloc(sizeof *path, GFP_ATOMIC);
439         if (!path)
440                 return NULL;
441
442         path->dev = dev;
443
444         skb_queue_head_init(&path->queue);
445
446         INIT_LIST_HEAD(&path->neigh_list);
447
448         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
449         path->pathrec.sgid      = priv->local_gid;
450         path->pathrec.pkey      = cpu_to_be16(priv->pkey);
451         path->pathrec.numb_path = 1;
452
453         return path;
454 }
455
456 static int path_rec_start(struct net_device *dev,
457                           struct ipoib_path *path)
458 {
459         struct ipoib_dev_priv *priv = netdev_priv(dev);
460
461         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
462                   IPOIB_GID_ARG(path->pathrec.dgid));
463
464         init_completion(&path->done);
465
466         path->query_id =
467                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
468                                    &path->pathrec,
469                                    IB_SA_PATH_REC_DGID          |
470                                    IB_SA_PATH_REC_SGID          |
471                                    IB_SA_PATH_REC_NUMB_PATH     |
472                                    IB_SA_PATH_REC_PKEY,
473                                    1000, GFP_ATOMIC,
474                                    path_rec_completion,
475                                    path, &path->query);
476         if (path->query_id < 0) {
477                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
478                 path->query = NULL;
479                 return path->query_id;
480         }
481
482         return 0;
483 }
484
485 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
486 {
487         struct ipoib_dev_priv *priv = netdev_priv(dev);
488         struct ipoib_path *path;
489         struct ipoib_neigh *neigh;
490
491         neigh = ipoib_neigh_alloc(skb->dst->neighbour);
492         if (!neigh) {
493                 ++priv->stats.tx_dropped;
494                 dev_kfree_skb_any(skb);
495                 return;
496         }
497
498         skb_queue_head_init(&neigh->queue);
499
500         /*
501          * We can only be called from ipoib_start_xmit, so we're
502          * inside tx_lock -- no need to save/restore flags.
503          */
504         spin_lock(&priv->lock);
505
506         path = __path_find(dev, skb->dst->neighbour->ha + 4);
507         if (!path) {
508                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
509                 if (!path)
510                         goto err_path;
511
512                 __path_add(dev, path);
513         }
514
515         list_add_tail(&neigh->list, &path->neigh_list);
516
517         if (path->ah) {
518                 kref_get(&path->ah->ref);
519                 neigh->ah = path->ah;
520                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
521                        sizeof(union ib_gid));
522
523                 ipoib_send(dev, skb, path->ah,
524                            be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
525         } else {
526                 neigh->ah  = NULL;
527                 __skb_queue_tail(&neigh->queue, skb);
528
529                 if (!path->query && path_rec_start(dev, path))
530                         goto err_list;
531         }
532
533         spin_unlock(&priv->lock);
534         return;
535
536 err_list:
537         list_del(&neigh->list);
538
539 err_path:
540         ipoib_neigh_free(neigh);
541         ++priv->stats.tx_dropped;
542         dev_kfree_skb_any(skb);
543
544         spin_unlock(&priv->lock);
545 }
546
547 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
548 {
549         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
550
551         /* Look up path record for unicasts */
552         if (skb->dst->neighbour->ha[4] != 0xff) {
553                 neigh_add_path(skb, dev);
554                 return;
555         }
556
557         /* Add in the P_Key for multicasts */
558         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
559         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
560         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
561 }
562
563 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
564                              struct ipoib_pseudoheader *phdr)
565 {
566         struct ipoib_dev_priv *priv = netdev_priv(dev);
567         struct ipoib_path *path;
568
569         /*
570          * We can only be called from ipoib_start_xmit, so we're
571          * inside tx_lock -- no need to save/restore flags.
572          */
573         spin_lock(&priv->lock);
574
575         path = __path_find(dev, phdr->hwaddr + 4);
576         if (!path) {
577                 path = path_rec_create(dev, phdr->hwaddr + 4);
578                 if (path) {
579                         /* put pseudoheader back on for next time */
580                         skb_push(skb, sizeof *phdr);
581                         __skb_queue_tail(&path->queue, skb);
582
583                         if (path_rec_start(dev, path)) {
584                                 spin_unlock(&priv->lock);
585                                 path_free(dev, path);
586                                 return;
587                         } else
588                                 __path_add(dev, path);
589                 } else {
590                         ++priv->stats.tx_dropped;
591                         dev_kfree_skb_any(skb);
592                 }
593
594                 spin_unlock(&priv->lock);
595                 return;
596         }
597
598         if (path->ah) {
599                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
600                           be16_to_cpu(path->pathrec.dlid));
601
602                 ipoib_send(dev, skb, path->ah,
603                            be32_to_cpup((__be32 *) phdr->hwaddr));
604         } else if ((path->query || !path_rec_start(dev, path)) &&
605                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
606                 /* put pseudoheader back on for next time */
607                 skb_push(skb, sizeof *phdr);
608                 __skb_queue_tail(&path->queue, skb);
609         } else {
610                 ++priv->stats.tx_dropped;
611                 dev_kfree_skb_any(skb);
612         }
613
614         spin_unlock(&priv->lock);
615 }
616
617 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
618 {
619         struct ipoib_dev_priv *priv = netdev_priv(dev);
620         struct ipoib_neigh *neigh;
621         unsigned long flags;
622
623         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
624                 return NETDEV_TX_LOCKED;
625
626         /*
627          * Check if our queue is stopped.  Since we have the LLTX bit
628          * set, we can't rely on netif_stop_queue() preventing our
629          * xmit function from being called with a full queue.
630          */
631         if (unlikely(netif_queue_stopped(dev))) {
632                 spin_unlock_irqrestore(&priv->tx_lock, flags);
633                 return NETDEV_TX_BUSY;
634         }
635
636         if (likely(skb->dst && skb->dst->neighbour)) {
637                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
638                         ipoib_path_lookup(skb, dev);
639                         goto out;
640                 }
641
642                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
643
644                 if (likely(neigh->ah)) {
645                         if (unlikely(memcmp(&neigh->dgid.raw,
646                                             skb->dst->neighbour->ha + 4,
647                                             sizeof(union ib_gid)))) {
648                                 spin_lock(&priv->lock);
649                                 /*
650                                  * It's safe to call ipoib_put_ah() inside
651                                  * priv->lock here, because we know that
652                                  * path->ah will always hold one more reference,
653                                  * so ipoib_put_ah() will never do more than
654                                  * decrement the ref count.
655                                  */
656                                 ipoib_put_ah(neigh->ah);
657                                 list_del(&neigh->list);
658                                 ipoib_neigh_free(neigh);
659                                 spin_unlock(&priv->lock);
660                                 ipoib_path_lookup(skb, dev);
661                                 goto out;
662                         }
663
664                         ipoib_send(dev, skb, neigh->ah,
665                                    be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
666                         goto out;
667                 }
668
669                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
670                         spin_lock(&priv->lock);
671                         __skb_queue_tail(&neigh->queue, skb);
672                         spin_unlock(&priv->lock);
673                 } else {
674                         ++priv->stats.tx_dropped;
675                         dev_kfree_skb_any(skb);
676                 }
677         } else {
678                 struct ipoib_pseudoheader *phdr =
679                         (struct ipoib_pseudoheader *) skb->data;
680                 skb_pull(skb, sizeof *phdr);
681
682                 if (phdr->hwaddr[4] == 0xff) {
683                         /* Add in the P_Key for multicast*/
684                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
685                         phdr->hwaddr[9] = priv->pkey & 0xff;
686
687                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
688                 } else {
689                         /* unicast GID -- should be ARP or RARP reply */
690
691                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
692                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
693                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
694                                            IPOIB_GID_FMT "\n",
695                                            skb->dst ? "neigh" : "dst",
696                                            be16_to_cpup((__be16 *) skb->data),
697                                            be32_to_cpup((__be32 *) phdr->hwaddr),
698                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
699                                 dev_kfree_skb_any(skb);
700                                 ++priv->stats.tx_dropped;
701                                 goto out;
702                         }
703
704                         unicast_arp_send(skb, dev, phdr);
705                 }
706         }
707
708 out:
709         spin_unlock_irqrestore(&priv->tx_lock, flags);
710
711         return NETDEV_TX_OK;
712 }
713
714 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
715 {
716         struct ipoib_dev_priv *priv = netdev_priv(dev);
717
718         return &priv->stats;
719 }
720
721 static void ipoib_timeout(struct net_device *dev)
722 {
723         struct ipoib_dev_priv *priv = netdev_priv(dev);
724
725         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
726                    jiffies_to_msecs(jiffies - dev->trans_start));
727         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
728                    netif_queue_stopped(dev),
729                    priv->tx_head, priv->tx_tail);
730         /* XXX reset QP, etc. */
731 }
732
733 static int ipoib_hard_header(struct sk_buff *skb,
734                              struct net_device *dev,
735                              unsigned short type,
736                              void *daddr, void *saddr, unsigned len)
737 {
738         struct ipoib_header *header;
739
740         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
741
742         header->proto = htons(type);
743         header->reserved = 0;
744
745         /*
746          * If we don't have a neighbour structure, stuff the
747          * destination address onto the front of the skb so we can
748          * figure out where to send the packet later.
749          */
750         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
751                 struct ipoib_pseudoheader *phdr =
752                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
753                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
754         }
755
756         return 0;
757 }
758
759 static void ipoib_set_mcast_list(struct net_device *dev)
760 {
761         struct ipoib_dev_priv *priv = netdev_priv(dev);
762
763         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
764                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
765                 return;
766         }
767
768         queue_work(ipoib_workqueue, &priv->restart_task);
769 }
770
771 static void ipoib_neigh_destructor(struct neighbour *n)
772 {
773         struct ipoib_neigh *neigh;
774         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
775         unsigned long flags;
776         struct ipoib_ah *ah = NULL;
777
778         ipoib_dbg(priv,
779                   "neigh_destructor for %06x " IPOIB_GID_FMT "\n",
780                   be32_to_cpup((__be32 *) n->ha),
781                   IPOIB_GID_RAW_ARG(n->ha + 4));
782
783         spin_lock_irqsave(&priv->lock, flags);
784
785         neigh = *to_ipoib_neigh(n);
786         if (neigh) {
787                 if (neigh->ah)
788                         ah = neigh->ah;
789                 list_del(&neigh->list);
790                 ipoib_neigh_free(neigh);
791         }
792
793         spin_unlock_irqrestore(&priv->lock, flags);
794
795         if (ah)
796                 ipoib_put_ah(ah);
797 }
798
799 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
800 {
801         struct ipoib_neigh *neigh;
802
803         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
804         if (!neigh)
805                 return NULL;
806
807         neigh->neighbour = neighbour;
808         *to_ipoib_neigh(neighbour) = neigh;
809
810         return neigh;
811 }
812
813 void ipoib_neigh_free(struct ipoib_neigh *neigh)
814 {
815         *to_ipoib_neigh(neigh->neighbour) = NULL;
816         kfree(neigh);
817 }
818
819 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
820 {
821         parms->neigh_destructor = ipoib_neigh_destructor;
822
823         return 0;
824 }
825
826 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
827 {
828         struct ipoib_dev_priv *priv = netdev_priv(dev);
829
830         /* Allocate RX/TX "rings" to hold queued skbs */
831         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
832                                 GFP_KERNEL);
833         if (!priv->rx_ring) {
834                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
835                        ca->name, ipoib_recvq_size);
836                 goto out;
837         }
838
839         priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
840                                 GFP_KERNEL);
841         if (!priv->tx_ring) {
842                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
843                        ca->name, ipoib_sendq_size);
844                 goto out_rx_ring_cleanup;
845         }
846
847         /* priv->tx_head & tx_tail are already 0 */
848
849         if (ipoib_ib_dev_init(dev, ca, port))
850                 goto out_tx_ring_cleanup;
851
852         return 0;
853
854 out_tx_ring_cleanup:
855         kfree(priv->tx_ring);
856
857 out_rx_ring_cleanup:
858         kfree(priv->rx_ring);
859
860 out:
861         return -ENOMEM;
862 }
863
864 void ipoib_dev_cleanup(struct net_device *dev)
865 {
866         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
867
868         ipoib_delete_debug_files(dev);
869
870         /* Delete any child interfaces first */
871         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
872                 unregister_netdev(cpriv->dev);
873                 ipoib_dev_cleanup(cpriv->dev);
874                 free_netdev(cpriv->dev);
875         }
876
877         ipoib_ib_dev_cleanup(dev);
878
879         kfree(priv->rx_ring);
880         kfree(priv->tx_ring);
881
882         priv->rx_ring = NULL;
883         priv->tx_ring = NULL;
884 }
885
886 static void ipoib_setup(struct net_device *dev)
887 {
888         struct ipoib_dev_priv *priv = netdev_priv(dev);
889
890         dev->open                = ipoib_open;
891         dev->stop                = ipoib_stop;
892         dev->change_mtu          = ipoib_change_mtu;
893         dev->hard_start_xmit     = ipoib_start_xmit;
894         dev->get_stats           = ipoib_get_stats;
895         dev->tx_timeout          = ipoib_timeout;
896         dev->hard_header         = ipoib_hard_header;
897         dev->set_multicast_list  = ipoib_set_mcast_list;
898         dev->neigh_setup         = ipoib_neigh_setup_dev;
899
900         dev->watchdog_timeo      = HZ;
901
902         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
903
904         /*
905          * We add in INFINIBAND_ALEN to allow for the destination
906          * address "pseudoheader" for skbs without neighbour struct.
907          */
908         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
909         dev->addr_len            = INFINIBAND_ALEN;
910         dev->type                = ARPHRD_INFINIBAND;
911         dev->tx_queue_len        = ipoib_sendq_size * 2;
912         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
913
914         /* MTU will be reset when mcast join happens */
915         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
916         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
917
918         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
919
920         netif_carrier_off(dev);
921
922         SET_MODULE_OWNER(dev);
923
924         priv->dev = dev;
925
926         spin_lock_init(&priv->lock);
927         spin_lock_init(&priv->tx_lock);
928
929         mutex_init(&priv->mcast_mutex);
930         mutex_init(&priv->vlan_mutex);
931
932         INIT_LIST_HEAD(&priv->path_list);
933         INIT_LIST_HEAD(&priv->child_intfs);
934         INIT_LIST_HEAD(&priv->dead_ahs);
935         INIT_LIST_HEAD(&priv->multicast_list);
936
937         INIT_WORK(&priv->pkey_task,    ipoib_pkey_poll,          priv->dev);
938         INIT_WORK(&priv->mcast_task,   ipoib_mcast_join_task,    priv->dev);
939         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush,       priv->dev);
940         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task, priv->dev);
941         INIT_WORK(&priv->ah_reap_task, ipoib_reap_ah,            priv->dev);
942 }
943
944 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
945 {
946         struct net_device *dev;
947
948         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
949                            ipoib_setup);
950         if (!dev)
951                 return NULL;
952
953         return netdev_priv(dev);
954 }
955
956 static ssize_t show_pkey(struct class_device *cdev, char *buf)
957 {
958         struct ipoib_dev_priv *priv =
959                 netdev_priv(container_of(cdev, struct net_device, class_dev));
960
961         return sprintf(buf, "0x%04x\n", priv->pkey);
962 }
963 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
964
965 static ssize_t create_child(struct class_device *cdev,
966                             const char *buf, size_t count)
967 {
968         int pkey;
969         int ret;
970
971         if (sscanf(buf, "%i", &pkey) != 1)
972                 return -EINVAL;
973
974         if (pkey < 0 || pkey > 0xffff)
975                 return -EINVAL;
976
977         /*
978          * Set the full membership bit, so that we join the right
979          * broadcast group, etc.
980          */
981         pkey |= 0x8000;
982
983         ret = ipoib_vlan_add(container_of(cdev, struct net_device, class_dev),
984                              pkey);
985
986         return ret ? ret : count;
987 }
988 static CLASS_DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
989
990 static ssize_t delete_child(struct class_device *cdev,
991                             const char *buf, size_t count)
992 {
993         int pkey;
994         int ret;
995
996         if (sscanf(buf, "%i", &pkey) != 1)
997                 return -EINVAL;
998
999         if (pkey < 0 || pkey > 0xffff)
1000                 return -EINVAL;
1001
1002         ret = ipoib_vlan_delete(container_of(cdev, struct net_device, class_dev),
1003                                 pkey);
1004
1005         return ret ? ret : count;
1006
1007 }
1008 static CLASS_DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1009
1010 int ipoib_add_pkey_attr(struct net_device *dev)
1011 {
1012         return class_device_create_file(&dev->class_dev,
1013                                         &class_device_attr_pkey);
1014 }
1015
1016 static struct net_device *ipoib_add_port(const char *format,
1017                                          struct ib_device *hca, u8 port)
1018 {
1019         struct ipoib_dev_priv *priv;
1020         int result = -ENOMEM;
1021
1022         priv = ipoib_intf_alloc(format);
1023         if (!priv)
1024                 goto alloc_mem_failed;
1025
1026         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1027
1028         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1029         if (result) {
1030                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1031                        hca->name, port, result);
1032                 goto alloc_mem_failed;
1033         }
1034
1035         /*
1036          * Set the full membership bit, so that we join the right
1037          * broadcast group, etc.
1038          */
1039         priv->pkey |= 0x8000;
1040
1041         priv->dev->broadcast[8] = priv->pkey >> 8;
1042         priv->dev->broadcast[9] = priv->pkey & 0xff;
1043
1044         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1045         if (result) {
1046                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1047                        hca->name, port, result);
1048                 goto alloc_mem_failed;
1049         } else
1050                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1051
1052
1053         result = ipoib_dev_init(priv->dev, hca, port);
1054         if (result < 0) {
1055                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1056                        hca->name, port, result);
1057                 goto device_init_failed;
1058         }
1059
1060         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1061                               priv->ca, ipoib_event);
1062         result = ib_register_event_handler(&priv->event_handler);
1063         if (result < 0) {
1064                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1065                        "port %d (ret = %d)\n",
1066                        hca->name, port, result);
1067                 goto event_failed;
1068         }
1069
1070         result = register_netdev(priv->dev);
1071         if (result) {
1072                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1073                        hca->name, port, result);
1074                 goto register_failed;
1075         }
1076
1077         ipoib_create_debug_files(priv->dev);
1078
1079         if (ipoib_add_pkey_attr(priv->dev))
1080                 goto sysfs_failed;
1081         if (class_device_create_file(&priv->dev->class_dev,
1082                                      &class_device_attr_create_child))
1083                 goto sysfs_failed;
1084         if (class_device_create_file(&priv->dev->class_dev,
1085                                      &class_device_attr_delete_child))
1086                 goto sysfs_failed;
1087
1088         return priv->dev;
1089
1090 sysfs_failed:
1091         ipoib_delete_debug_files(priv->dev);
1092         unregister_netdev(priv->dev);
1093
1094 register_failed:
1095         ib_unregister_event_handler(&priv->event_handler);
1096         flush_scheduled_work();
1097
1098 event_failed:
1099         ipoib_dev_cleanup(priv->dev);
1100
1101 device_init_failed:
1102         free_netdev(priv->dev);
1103
1104 alloc_mem_failed:
1105         return ERR_PTR(result);
1106 }
1107
1108 static void ipoib_add_one(struct ib_device *device)
1109 {
1110         struct list_head *dev_list;
1111         struct net_device *dev;
1112         struct ipoib_dev_priv *priv;
1113         int s, e, p;
1114
1115         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1116                 return;
1117
1118         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1119         if (!dev_list)
1120                 return;
1121
1122         INIT_LIST_HEAD(dev_list);
1123
1124         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1125                 s = 0;
1126                 e = 0;
1127         } else {
1128                 s = 1;
1129                 e = device->phys_port_cnt;
1130         }
1131
1132         for (p = s; p <= e; ++p) {
1133                 dev = ipoib_add_port("ib%d", device, p);
1134                 if (!IS_ERR(dev)) {
1135                         priv = netdev_priv(dev);
1136                         list_add_tail(&priv->list, dev_list);
1137                 }
1138         }
1139
1140         ib_set_client_data(device, &ipoib_client, dev_list);
1141 }
1142
1143 static void ipoib_remove_one(struct ib_device *device)
1144 {
1145         struct ipoib_dev_priv *priv, *tmp;
1146         struct list_head *dev_list;
1147
1148         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1149                 return;
1150
1151         dev_list = ib_get_client_data(device, &ipoib_client);
1152
1153         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1154                 ib_unregister_event_handler(&priv->event_handler);
1155                 flush_scheduled_work();
1156
1157                 unregister_netdev(priv->dev);
1158                 ipoib_dev_cleanup(priv->dev);
1159                 free_netdev(priv->dev);
1160         }
1161
1162         kfree(dev_list);
1163 }
1164
1165 static int __init ipoib_init_module(void)
1166 {
1167         int ret;
1168
1169         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1170         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1171         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1172
1173         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1174         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1175         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1176
1177         ret = ipoib_register_debugfs();
1178         if (ret)
1179                 return ret;
1180
1181         /*
1182          * We create our own workqueue mainly because we want to be
1183          * able to flush it when devices are being removed.  We can't
1184          * use schedule_work()/flush_scheduled_work() because both
1185          * unregister_netdev() and linkwatch_event take the rtnl lock,
1186          * so flush_scheduled_work() can deadlock during device
1187          * removal.
1188          */
1189         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1190         if (!ipoib_workqueue) {
1191                 ret = -ENOMEM;
1192                 goto err_fs;
1193         }
1194
1195         ib_sa_register_client(&ipoib_sa_client);
1196
1197         ret = ib_register_client(&ipoib_client);
1198         if (ret)
1199                 goto err_sa;
1200
1201         return 0;
1202
1203 err_sa:
1204         ib_sa_unregister_client(&ipoib_sa_client);
1205         destroy_workqueue(ipoib_workqueue);
1206
1207 err_fs:
1208         ipoib_unregister_debugfs();
1209
1210         return ret;
1211 }
1212
1213 static void __exit ipoib_cleanup_module(void)
1214 {
1215         ib_unregister_client(&ipoib_client);
1216         ib_sa_unregister_client(&ipoib_sa_client);
1217         ipoib_unregister_debugfs();
1218         destroy_workqueue(ipoib_workqueue);
1219 }
1220
1221 module_init(ipoib_init_module);
1222 module_exit(ipoib_cleanup_module);