IPoIB: Use netif_tx_lock() and get rid of private tx_lock, LLTX
[linux-2.6.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
1 /*
2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  */
34
35 #include "ipoib.h"
36
37 #include <linux/module.h>
38
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.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 #include <net/dst.h>
50
51 MODULE_AUTHOR("Roland Dreier");
52 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
56 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
57
58 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
59 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
60 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
61 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
62
63 static int lro;
64 module_param(lro, bool, 0444);
65 MODULE_PARM_DESC(lro,  "Enable LRO (Large Receive Offload)");
66
67 static int lro_max_aggr = IPOIB_LRO_MAX_AGGR;
68 module_param(lro_max_aggr, int, 0644);
69 MODULE_PARM_DESC(lro_max_aggr, "LRO: Max packets to be aggregated "
70                 "(default = 64)");
71
72 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
73 int ipoib_debug_level;
74
75 module_param_named(debug_level, ipoib_debug_level, int, 0644);
76 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
77 #endif
78
79 struct ipoib_path_iter {
80         struct net_device *dev;
81         struct ipoib_path  path;
82 };
83
84 static const u8 ipv4_bcast_addr[] = {
85         0x00, 0xff, 0xff, 0xff,
86         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
87         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
88 };
89
90 struct workqueue_struct *ipoib_workqueue;
91
92 struct ib_sa_client ipoib_sa_client;
93
94 static void ipoib_add_one(struct ib_device *device);
95 static void ipoib_remove_one(struct ib_device *device);
96
97 static struct ib_client ipoib_client = {
98         .name   = "ipoib",
99         .add    = ipoib_add_one,
100         .remove = ipoib_remove_one
101 };
102
103 int ipoib_open(struct net_device *dev)
104 {
105         struct ipoib_dev_priv *priv = netdev_priv(dev);
106
107         ipoib_dbg(priv, "bringing up interface\n");
108
109         napi_enable(&priv->napi);
110         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
111
112         if (ipoib_pkey_dev_delay_open(dev))
113                 return 0;
114
115         if (ipoib_ib_dev_open(dev)) {
116                 napi_disable(&priv->napi);
117                 return -EINVAL;
118         }
119
120         if (ipoib_ib_dev_up(dev)) {
121                 ipoib_ib_dev_stop(dev, 1);
122                 napi_disable(&priv->napi);
123                 return -EINVAL;
124         }
125
126         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
127                 struct ipoib_dev_priv *cpriv;
128
129                 /* Bring up any child interfaces too */
130                 mutex_lock(&priv->vlan_mutex);
131                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
132                         int flags;
133
134                         flags = cpriv->dev->flags;
135                         if (flags & IFF_UP)
136                                 continue;
137
138                         dev_change_flags(cpriv->dev, flags | IFF_UP);
139                 }
140                 mutex_unlock(&priv->vlan_mutex);
141         }
142
143         netif_start_queue(dev);
144
145         return 0;
146 }
147
148 static int ipoib_stop(struct net_device *dev)
149 {
150         struct ipoib_dev_priv *priv = netdev_priv(dev);
151
152         ipoib_dbg(priv, "stopping interface\n");
153
154         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
155         napi_disable(&priv->napi);
156
157         netif_stop_queue(dev);
158
159         ipoib_ib_dev_down(dev, 0);
160         ipoib_ib_dev_stop(dev, 0);
161
162         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
163                 struct ipoib_dev_priv *cpriv;
164
165                 /* Bring down any child interfaces too */
166                 mutex_lock(&priv->vlan_mutex);
167                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
168                         int flags;
169
170                         flags = cpriv->dev->flags;
171                         if (!(flags & IFF_UP))
172                                 continue;
173
174                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
175                 }
176                 mutex_unlock(&priv->vlan_mutex);
177         }
178
179         return 0;
180 }
181
182 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
183 {
184         struct ipoib_dev_priv *priv = netdev_priv(dev);
185
186         /* dev->mtu > 2K ==> connected mode */
187         if (ipoib_cm_admin_enabled(dev)) {
188                 if (new_mtu > ipoib_cm_max_mtu(dev))
189                         return -EINVAL;
190
191                 if (new_mtu > priv->mcast_mtu)
192                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
193                                    priv->mcast_mtu);
194
195                 dev->mtu = new_mtu;
196                 return 0;
197         }
198
199         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
200                 return -EINVAL;
201
202         priv->admin_mtu = new_mtu;
203
204         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
205
206         return 0;
207 }
208
209 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
210 {
211         struct ipoib_dev_priv *priv = netdev_priv(dev);
212         struct rb_node *n = priv->path_tree.rb_node;
213         struct ipoib_path *path;
214         int ret;
215
216         while (n) {
217                 path = rb_entry(n, struct ipoib_path, rb_node);
218
219                 ret = memcmp(gid, path->pathrec.dgid.raw,
220                              sizeof (union ib_gid));
221
222                 if (ret < 0)
223                         n = n->rb_left;
224                 else if (ret > 0)
225                         n = n->rb_right;
226                 else
227                         return path;
228         }
229
230         return NULL;
231 }
232
233 static int __path_add(struct net_device *dev, struct ipoib_path *path)
234 {
235         struct ipoib_dev_priv *priv = netdev_priv(dev);
236         struct rb_node **n = &priv->path_tree.rb_node;
237         struct rb_node *pn = NULL;
238         struct ipoib_path *tpath;
239         int ret;
240
241         while (*n) {
242                 pn = *n;
243                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
244
245                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
246                              sizeof (union ib_gid));
247                 if (ret < 0)
248                         n = &pn->rb_left;
249                 else if (ret > 0)
250                         n = &pn->rb_right;
251                 else
252                         return -EEXIST;
253         }
254
255         rb_link_node(&path->rb_node, pn, n);
256         rb_insert_color(&path->rb_node, &priv->path_tree);
257
258         list_add_tail(&path->list, &priv->path_list);
259
260         return 0;
261 }
262
263 static void path_free(struct net_device *dev, struct ipoib_path *path)
264 {
265         struct ipoib_dev_priv *priv = netdev_priv(dev);
266         struct ipoib_neigh *neigh, *tn;
267         struct sk_buff *skb;
268         unsigned long flags;
269
270         while ((skb = __skb_dequeue(&path->queue)))
271                 dev_kfree_skb_irq(skb);
272
273         spin_lock_irqsave(&priv->lock, flags);
274
275         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
276                 /*
277                  * It's safe to call ipoib_put_ah() inside priv->lock
278                  * here, because we know that path->ah will always
279                  * hold one more reference, so ipoib_put_ah() will
280                  * never do more than decrement the ref count.
281                  */
282                 if (neigh->ah)
283                         ipoib_put_ah(neigh->ah);
284
285                 ipoib_neigh_free(dev, neigh);
286         }
287
288         spin_unlock_irqrestore(&priv->lock, flags);
289
290         if (path->ah)
291                 ipoib_put_ah(path->ah);
292
293         kfree(path);
294 }
295
296 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
297
298 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
299 {
300         struct ipoib_path_iter *iter;
301
302         iter = kmalloc(sizeof *iter, GFP_KERNEL);
303         if (!iter)
304                 return NULL;
305
306         iter->dev = dev;
307         memset(iter->path.pathrec.dgid.raw, 0, 16);
308
309         if (ipoib_path_iter_next(iter)) {
310                 kfree(iter);
311                 return NULL;
312         }
313
314         return iter;
315 }
316
317 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
318 {
319         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
320         struct rb_node *n;
321         struct ipoib_path *path;
322         int ret = 1;
323
324         spin_lock_irq(&priv->lock);
325
326         n = rb_first(&priv->path_tree);
327
328         while (n) {
329                 path = rb_entry(n, struct ipoib_path, rb_node);
330
331                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
332                            sizeof (union ib_gid)) < 0) {
333                         iter->path = *path;
334                         ret = 0;
335                         break;
336                 }
337
338                 n = rb_next(n);
339         }
340
341         spin_unlock_irq(&priv->lock);
342
343         return ret;
344 }
345
346 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
347                           struct ipoib_path *path)
348 {
349         *path = iter->path;
350 }
351
352 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
353
354 void ipoib_mark_paths_invalid(struct net_device *dev)
355 {
356         struct ipoib_dev_priv *priv = netdev_priv(dev);
357         struct ipoib_path *path, *tp;
358
359         spin_lock_irq(&priv->lock);
360
361         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
362                 ipoib_dbg(priv, "mark path LID 0x%04x GID " IPOIB_GID_FMT " invalid\n",
363                         be16_to_cpu(path->pathrec.dlid),
364                         IPOIB_GID_ARG(path->pathrec.dgid));
365                 path->valid =  0;
366         }
367
368         spin_unlock_irq(&priv->lock);
369 }
370
371 void ipoib_flush_paths(struct net_device *dev)
372 {
373         struct ipoib_dev_priv *priv = netdev_priv(dev);
374         struct ipoib_path *path, *tp;
375         LIST_HEAD(remove_list);
376         unsigned long flags;
377
378         netif_tx_lock_bh(dev);
379         spin_lock_irqsave(&priv->lock, flags);
380
381         list_splice_init(&priv->path_list, &remove_list);
382
383         list_for_each_entry(path, &remove_list, list)
384                 rb_erase(&path->rb_node, &priv->path_tree);
385
386         list_for_each_entry_safe(path, tp, &remove_list, list) {
387                 if (path->query)
388                         ib_sa_cancel_query(path->query_id, path->query);
389                 spin_unlock_irqrestore(&priv->lock, flags);
390                 netif_tx_unlock_bh(dev);
391                 wait_for_completion(&path->done);
392                 path_free(dev, path);
393                 netif_tx_lock_bh(dev);
394                 spin_lock_irqsave(&priv->lock, flags);
395         }
396
397         spin_unlock_irqrestore(&priv->lock, flags);
398         netif_tx_unlock_bh(dev);
399 }
400
401 static void path_rec_completion(int status,
402                                 struct ib_sa_path_rec *pathrec,
403                                 void *path_ptr)
404 {
405         struct ipoib_path *path = path_ptr;
406         struct net_device *dev = path->dev;
407         struct ipoib_dev_priv *priv = netdev_priv(dev);
408         struct ipoib_ah *ah = NULL;
409         struct ipoib_ah *old_ah = NULL;
410         struct ipoib_neigh *neigh, *tn;
411         struct sk_buff_head skqueue;
412         struct sk_buff *skb;
413         unsigned long flags;
414
415         if (!status)
416                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
417                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
418         else
419                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
420                           status, IPOIB_GID_ARG(path->pathrec.dgid));
421
422         skb_queue_head_init(&skqueue);
423
424         if (!status) {
425                 struct ib_ah_attr av;
426
427                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
428                         ah = ipoib_create_ah(dev, priv->pd, &av);
429         }
430
431         spin_lock_irqsave(&priv->lock, flags);
432
433         if (ah) {
434                 path->pathrec = *pathrec;
435
436                 old_ah   = path->ah;
437                 path->ah = ah;
438
439                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
440                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
441
442                 while ((skb = __skb_dequeue(&path->queue)))
443                         __skb_queue_tail(&skqueue, skb);
444
445                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
446                         if (neigh->ah) {
447                                 WARN_ON(neigh->ah != old_ah);
448                                 /*
449                                  * Dropping the ah reference inside
450                                  * priv->lock is safe here, because we
451                                  * will hold one more reference from
452                                  * the original value of path->ah (ie
453                                  * old_ah).
454                                  */
455                                 ipoib_put_ah(neigh->ah);
456                         }
457                         kref_get(&path->ah->ref);
458                         neigh->ah = path->ah;
459                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
460                                sizeof(union ib_gid));
461
462                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
463                                 if (!ipoib_cm_get(neigh))
464                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
465                                                                                path,
466                                                                                neigh));
467                                 if (!ipoib_cm_get(neigh)) {
468                                         list_del(&neigh->list);
469                                         if (neigh->ah)
470                                                 ipoib_put_ah(neigh->ah);
471                                         ipoib_neigh_free(dev, neigh);
472                                         continue;
473                                 }
474                         }
475
476                         while ((skb = __skb_dequeue(&neigh->queue)))
477                                 __skb_queue_tail(&skqueue, skb);
478                 }
479                 path->valid = 1;
480         }
481
482         path->query = NULL;
483         complete(&path->done);
484
485         spin_unlock_irqrestore(&priv->lock, flags);
486
487         if (old_ah)
488                 ipoib_put_ah(old_ah);
489
490         while ((skb = __skb_dequeue(&skqueue))) {
491                 skb->dev = dev;
492                 if (dev_queue_xmit(skb))
493                         ipoib_warn(priv, "dev_queue_xmit failed "
494                                    "to requeue packet\n");
495         }
496 }
497
498 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
499 {
500         struct ipoib_dev_priv *priv = netdev_priv(dev);
501         struct ipoib_path *path;
502
503         if (!priv->broadcast)
504                 return NULL;
505
506         path = kzalloc(sizeof *path, GFP_ATOMIC);
507         if (!path)
508                 return NULL;
509
510         path->dev = dev;
511
512         skb_queue_head_init(&path->queue);
513
514         INIT_LIST_HEAD(&path->neigh_list);
515
516         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
517         path->pathrec.sgid          = priv->local_gid;
518         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
519         path->pathrec.numb_path     = 1;
520         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
521
522         return path;
523 }
524
525 static int path_rec_start(struct net_device *dev,
526                           struct ipoib_path *path)
527 {
528         struct ipoib_dev_priv *priv = netdev_priv(dev);
529
530         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
531                   IPOIB_GID_ARG(path->pathrec.dgid));
532
533         init_completion(&path->done);
534
535         path->query_id =
536                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
537                                    &path->pathrec,
538                                    IB_SA_PATH_REC_DGID          |
539                                    IB_SA_PATH_REC_SGID          |
540                                    IB_SA_PATH_REC_NUMB_PATH     |
541                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
542                                    IB_SA_PATH_REC_PKEY,
543                                    1000, GFP_ATOMIC,
544                                    path_rec_completion,
545                                    path, &path->query);
546         if (path->query_id < 0) {
547                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
548                 path->query = NULL;
549                 return path->query_id;
550         }
551
552         return 0;
553 }
554
555 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
556 {
557         struct ipoib_dev_priv *priv = netdev_priv(dev);
558         struct ipoib_path *path;
559         struct ipoib_neigh *neigh;
560         unsigned long flags;
561
562         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
563         if (!neigh) {
564                 ++dev->stats.tx_dropped;
565                 dev_kfree_skb_any(skb);
566                 return;
567         }
568
569         spin_lock_irqsave(&priv->lock, flags);
570
571         path = __path_find(dev, skb->dst->neighbour->ha + 4);
572         if (!path) {
573                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
574                 if (!path)
575                         goto err_path;
576
577                 __path_add(dev, path);
578         }
579
580         list_add_tail(&neigh->list, &path->neigh_list);
581
582         if (path->ah) {
583                 kref_get(&path->ah->ref);
584                 neigh->ah = path->ah;
585                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
586                        sizeof(union ib_gid));
587
588                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
589                         if (!ipoib_cm_get(neigh))
590                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
591                         if (!ipoib_cm_get(neigh)) {
592                                 list_del(&neigh->list);
593                                 if (neigh->ah)
594                                         ipoib_put_ah(neigh->ah);
595                                 ipoib_neigh_free(dev, neigh);
596                                 goto err_drop;
597                         }
598                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
599                                 __skb_queue_tail(&neigh->queue, skb);
600                         else {
601                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
602                                            skb_queue_len(&neigh->queue));
603                                 goto err_drop;
604                         }
605                 } else
606                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
607         } else {
608                 neigh->ah  = NULL;
609
610                 if (!path->query && path_rec_start(dev, path))
611                         goto err_list;
612
613                 __skb_queue_tail(&neigh->queue, skb);
614         }
615
616         spin_unlock_irqrestore(&priv->lock, flags);
617         return;
618
619 err_list:
620         list_del(&neigh->list);
621
622 err_path:
623         ipoib_neigh_free(dev, neigh);
624 err_drop:
625         ++dev->stats.tx_dropped;
626         dev_kfree_skb_any(skb);
627
628         spin_unlock_irqrestore(&priv->lock, flags);
629 }
630
631 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
632 {
633         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
634
635         /* Look up path record for unicasts */
636         if (skb->dst->neighbour->ha[4] != 0xff) {
637                 neigh_add_path(skb, dev);
638                 return;
639         }
640
641         /* Add in the P_Key for multicasts */
642         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
643         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
644         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
645 }
646
647 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
648                              struct ipoib_pseudoheader *phdr)
649 {
650         struct ipoib_dev_priv *priv = netdev_priv(dev);
651         struct ipoib_path *path;
652         unsigned long flags;
653
654         spin_lock_irqsave(&priv->lock, flags);
655
656         path = __path_find(dev, phdr->hwaddr + 4);
657         if (!path || !path->valid) {
658                 if (!path)
659                         path = path_rec_create(dev, phdr->hwaddr + 4);
660                 if (path) {
661                         /* put pseudoheader back on for next time */
662                         skb_push(skb, sizeof *phdr);
663                         __skb_queue_tail(&path->queue, skb);
664
665                         if (path_rec_start(dev, path)) {
666                                 spin_unlock_irqrestore(&priv->lock, flags);
667                                 path_free(dev, path);
668                                 return;
669                         } else
670                                 __path_add(dev, path);
671                 } else {
672                         ++dev->stats.tx_dropped;
673                         dev_kfree_skb_any(skb);
674                 }
675
676                 spin_unlock_irqrestore(&priv->lock, flags);
677                 return;
678         }
679
680         if (path->ah) {
681                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
682                           be16_to_cpu(path->pathrec.dlid));
683
684                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
685         } else if ((path->query || !path_rec_start(dev, path)) &&
686                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
687                 /* put pseudoheader back on for next time */
688                 skb_push(skb, sizeof *phdr);
689                 __skb_queue_tail(&path->queue, skb);
690         } else {
691                 ++dev->stats.tx_dropped;
692                 dev_kfree_skb_any(skb);
693         }
694
695         spin_unlock_irqrestore(&priv->lock, flags);
696 }
697
698 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
699 {
700         struct ipoib_dev_priv *priv = netdev_priv(dev);
701         struct ipoib_neigh *neigh;
702         unsigned long flags;
703
704         if (likely(skb->dst && skb->dst->neighbour)) {
705                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
706                         ipoib_path_lookup(skb, dev);
707                         return NETDEV_TX_OK;
708                 }
709
710                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
711
712                 if (neigh->ah)
713                         if (unlikely((memcmp(&neigh->dgid.raw,
714                                             skb->dst->neighbour->ha + 4,
715                                             sizeof(union ib_gid))) ||
716                                          (neigh->dev != dev))) {
717                                 spin_lock_irqsave(&priv->lock, flags);
718                                 /*
719                                  * It's safe to call ipoib_put_ah() inside
720                                  * priv->lock here, because we know that
721                                  * path->ah will always hold one more reference,
722                                  * so ipoib_put_ah() will never do more than
723                                  * decrement the ref count.
724                                  */
725                                 ipoib_put_ah(neigh->ah);
726                                 list_del(&neigh->list);
727                                 ipoib_neigh_free(dev, neigh);
728                                 spin_unlock_irqrestore(&priv->lock, flags);
729                                 ipoib_path_lookup(skb, dev);
730                                 return NETDEV_TX_OK;
731                         }
732
733                 if (ipoib_cm_get(neigh)) {
734                         if (ipoib_cm_up(neigh)) {
735                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
736                                 return NETDEV_TX_OK;
737                         }
738                 } else if (neigh->ah) {
739                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
740                         return NETDEV_TX_OK;
741                 }
742
743                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
744                         spin_lock_irqsave(&priv->lock, flags);
745                         __skb_queue_tail(&neigh->queue, skb);
746                         spin_unlock_irqrestore(&priv->lock, flags);
747                 } else {
748                         ++dev->stats.tx_dropped;
749                         dev_kfree_skb_any(skb);
750                 }
751         } else {
752                 struct ipoib_pseudoheader *phdr =
753                         (struct ipoib_pseudoheader *) skb->data;
754                 skb_pull(skb, sizeof *phdr);
755
756                 if (phdr->hwaddr[4] == 0xff) {
757                         /* Add in the P_Key for multicast*/
758                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
759                         phdr->hwaddr[9] = priv->pkey & 0xff;
760
761                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
762                 } else {
763                         /* unicast GID -- should be ARP or RARP reply */
764
765                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
766                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
767                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
768                                            IPOIB_GID_FMT "\n",
769                                            skb->dst ? "neigh" : "dst",
770                                            be16_to_cpup((__be16 *) skb->data),
771                                            IPOIB_QPN(phdr->hwaddr),
772                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
773                                 dev_kfree_skb_any(skb);
774                                 ++dev->stats.tx_dropped;
775                                 return NETDEV_TX_OK;
776                         }
777
778                         unicast_arp_send(skb, dev, phdr);
779                 }
780         }
781
782         return NETDEV_TX_OK;
783 }
784
785 static void ipoib_timeout(struct net_device *dev)
786 {
787         struct ipoib_dev_priv *priv = netdev_priv(dev);
788
789         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
790                    jiffies_to_msecs(jiffies - dev->trans_start));
791         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
792                    netif_queue_stopped(dev),
793                    priv->tx_head, priv->tx_tail);
794         /* XXX reset QP, etc. */
795 }
796
797 static int ipoib_hard_header(struct sk_buff *skb,
798                              struct net_device *dev,
799                              unsigned short type,
800                              const void *daddr, const void *saddr, unsigned len)
801 {
802         struct ipoib_header *header;
803
804         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
805
806         header->proto = htons(type);
807         header->reserved = 0;
808
809         /*
810          * If we don't have a neighbour structure, stuff the
811          * destination address onto the front of the skb so we can
812          * figure out where to send the packet later.
813          */
814         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
815                 struct ipoib_pseudoheader *phdr =
816                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
817                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
818         }
819
820         return 0;
821 }
822
823 static void ipoib_set_mcast_list(struct net_device *dev)
824 {
825         struct ipoib_dev_priv *priv = netdev_priv(dev);
826
827         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
828                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
829                 return;
830         }
831
832         queue_work(ipoib_workqueue, &priv->restart_task);
833 }
834
835 static void ipoib_neigh_cleanup(struct neighbour *n)
836 {
837         struct ipoib_neigh *neigh;
838         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
839         unsigned long flags;
840         struct ipoib_ah *ah = NULL;
841
842         neigh = *to_ipoib_neigh(n);
843         if (neigh)
844                 priv = netdev_priv(neigh->dev);
845         else
846                 return;
847         ipoib_dbg(priv,
848                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
849                   IPOIB_QPN(n->ha),
850                   IPOIB_GID_RAW_ARG(n->ha + 4));
851
852         spin_lock_irqsave(&priv->lock, flags);
853
854         if (neigh->ah)
855                 ah = neigh->ah;
856         list_del(&neigh->list);
857         ipoib_neigh_free(n->dev, neigh);
858
859         spin_unlock_irqrestore(&priv->lock, flags);
860
861         if (ah)
862                 ipoib_put_ah(ah);
863 }
864
865 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
866                                       struct net_device *dev)
867 {
868         struct ipoib_neigh *neigh;
869
870         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
871         if (!neigh)
872                 return NULL;
873
874         neigh->neighbour = neighbour;
875         neigh->dev = dev;
876         *to_ipoib_neigh(neighbour) = neigh;
877         skb_queue_head_init(&neigh->queue);
878         ipoib_cm_set(neigh, NULL);
879
880         return neigh;
881 }
882
883 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
884 {
885         struct sk_buff *skb;
886         *to_ipoib_neigh(neigh->neighbour) = NULL;
887         while ((skb = __skb_dequeue(&neigh->queue))) {
888                 ++dev->stats.tx_dropped;
889                 dev_kfree_skb_any(skb);
890         }
891         if (ipoib_cm_get(neigh))
892                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
893         kfree(neigh);
894 }
895
896 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
897 {
898         parms->neigh_cleanup = ipoib_neigh_cleanup;
899
900         return 0;
901 }
902
903 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
904 {
905         struct ipoib_dev_priv *priv = netdev_priv(dev);
906
907         /* Allocate RX/TX "rings" to hold queued skbs */
908         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
909                                 GFP_KERNEL);
910         if (!priv->rx_ring) {
911                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
912                        ca->name, ipoib_recvq_size);
913                 goto out;
914         }
915
916         priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
917         if (!priv->tx_ring) {
918                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
919                        ca->name, ipoib_sendq_size);
920                 goto out_rx_ring_cleanup;
921         }
922         memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
923
924         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
925
926         if (ipoib_ib_dev_init(dev, ca, port))
927                 goto out_tx_ring_cleanup;
928
929         return 0;
930
931 out_tx_ring_cleanup:
932         vfree(priv->tx_ring);
933
934 out_rx_ring_cleanup:
935         kfree(priv->rx_ring);
936
937 out:
938         return -ENOMEM;
939 }
940
941 void ipoib_dev_cleanup(struct net_device *dev)
942 {
943         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
944
945         ipoib_delete_debug_files(dev);
946
947         /* Delete any child interfaces first */
948         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
949                 unregister_netdev(cpriv->dev);
950                 ipoib_dev_cleanup(cpriv->dev);
951                 free_netdev(cpriv->dev);
952         }
953
954         ipoib_ib_dev_cleanup(dev);
955
956         kfree(priv->rx_ring);
957         vfree(priv->tx_ring);
958
959         priv->rx_ring = NULL;
960         priv->tx_ring = NULL;
961 }
962
963 static const struct header_ops ipoib_header_ops = {
964         .create = ipoib_hard_header,
965 };
966
967 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
968                        void **tcph, u64 *hdr_flags, void *priv)
969 {
970         unsigned int ip_len;
971         struct iphdr *iph;
972
973         if (unlikely(skb->protocol != htons(ETH_P_IP)))
974                 return -1;
975
976         /*
977          * In the future we may add an else clause that verifies the
978          * checksum and allows devices which do not calculate checksum
979          * to use LRO.
980          */
981         if (unlikely(skb->ip_summed != CHECKSUM_UNNECESSARY))
982                 return -1;
983
984         /* Check for non-TCP packet */
985         skb_reset_network_header(skb);
986         iph = ip_hdr(skb);
987         if (iph->protocol != IPPROTO_TCP)
988                 return -1;
989
990         ip_len = ip_hdrlen(skb);
991         skb_set_transport_header(skb, ip_len);
992         *tcph = tcp_hdr(skb);
993
994         /* check if IP header and TCP header are complete */
995         if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
996                 return -1;
997
998         *hdr_flags = LRO_IPV4 | LRO_TCP;
999         *iphdr = iph;
1000
1001         return 0;
1002 }
1003
1004 static void ipoib_lro_setup(struct ipoib_dev_priv *priv)
1005 {
1006         priv->lro.lro_mgr.max_aggr       = lro_max_aggr;
1007         priv->lro.lro_mgr.max_desc       = IPOIB_MAX_LRO_DESCRIPTORS;
1008         priv->lro.lro_mgr.lro_arr        = priv->lro.lro_desc;
1009         priv->lro.lro_mgr.get_skb_header = get_skb_hdr;
1010         priv->lro.lro_mgr.features       = LRO_F_NAPI;
1011         priv->lro.lro_mgr.dev            = priv->dev;
1012         priv->lro.lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1013 }
1014
1015 static void ipoib_setup(struct net_device *dev)
1016 {
1017         struct ipoib_dev_priv *priv = netdev_priv(dev);
1018
1019         dev->open                = ipoib_open;
1020         dev->stop                = ipoib_stop;
1021         dev->change_mtu          = ipoib_change_mtu;
1022         dev->hard_start_xmit     = ipoib_start_xmit;
1023         dev->tx_timeout          = ipoib_timeout;
1024         dev->header_ops          = &ipoib_header_ops;
1025         dev->set_multicast_list  = ipoib_set_mcast_list;
1026         dev->neigh_setup         = ipoib_neigh_setup_dev;
1027
1028         ipoib_set_ethtool_ops(dev);
1029
1030         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1031
1032         dev->watchdog_timeo      = HZ;
1033
1034         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1035
1036         /*
1037          * We add in INFINIBAND_ALEN to allow for the destination
1038          * address "pseudoheader" for skbs without neighbour struct.
1039          */
1040         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1041         dev->addr_len            = INFINIBAND_ALEN;
1042         dev->type                = ARPHRD_INFINIBAND;
1043         dev->tx_queue_len        = ipoib_sendq_size * 2;
1044         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1045                                     NETIF_F_HIGHDMA);
1046
1047         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1048
1049         netif_carrier_off(dev);
1050
1051         priv->dev = dev;
1052
1053         ipoib_lro_setup(priv);
1054
1055         spin_lock_init(&priv->lock);
1056
1057         mutex_init(&priv->vlan_mutex);
1058
1059         INIT_LIST_HEAD(&priv->path_list);
1060         INIT_LIST_HEAD(&priv->child_intfs);
1061         INIT_LIST_HEAD(&priv->dead_ahs);
1062         INIT_LIST_HEAD(&priv->multicast_list);
1063
1064         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1065         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1066         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1067         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1068         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1069         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1070         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1071         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1072 }
1073
1074 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1075 {
1076         struct net_device *dev;
1077
1078         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1079                            ipoib_setup);
1080         if (!dev)
1081                 return NULL;
1082
1083         return netdev_priv(dev);
1084 }
1085
1086 static ssize_t show_pkey(struct device *dev,
1087                          struct device_attribute *attr, char *buf)
1088 {
1089         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1090
1091         return sprintf(buf, "0x%04x\n", priv->pkey);
1092 }
1093 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1094
1095 static ssize_t show_umcast(struct device *dev,
1096                            struct device_attribute *attr, char *buf)
1097 {
1098         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1099
1100         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1101 }
1102
1103 static ssize_t set_umcast(struct device *dev,
1104                           struct device_attribute *attr,
1105                           const char *buf, size_t count)
1106 {
1107         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1108         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1109
1110         if (umcast_val > 0) {
1111                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1112                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1113                                 "by userspace\n");
1114         } else
1115                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1116
1117         return count;
1118 }
1119 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1120
1121 int ipoib_add_umcast_attr(struct net_device *dev)
1122 {
1123         return device_create_file(&dev->dev, &dev_attr_umcast);
1124 }
1125
1126 static ssize_t create_child(struct device *dev,
1127                             struct device_attribute *attr,
1128                             const char *buf, size_t count)
1129 {
1130         int pkey;
1131         int ret;
1132
1133         if (sscanf(buf, "%i", &pkey) != 1)
1134                 return -EINVAL;
1135
1136         if (pkey < 0 || pkey > 0xffff)
1137                 return -EINVAL;
1138
1139         /*
1140          * Set the full membership bit, so that we join the right
1141          * broadcast group, etc.
1142          */
1143         pkey |= 0x8000;
1144
1145         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1146
1147         return ret ? ret : count;
1148 }
1149 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1150
1151 static ssize_t delete_child(struct device *dev,
1152                             struct device_attribute *attr,
1153                             const char *buf, size_t count)
1154 {
1155         int pkey;
1156         int ret;
1157
1158         if (sscanf(buf, "%i", &pkey) != 1)
1159                 return -EINVAL;
1160
1161         if (pkey < 0 || pkey > 0xffff)
1162                 return -EINVAL;
1163
1164         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1165
1166         return ret ? ret : count;
1167
1168 }
1169 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1170
1171 int ipoib_add_pkey_attr(struct net_device *dev)
1172 {
1173         return device_create_file(&dev->dev, &dev_attr_pkey);
1174 }
1175
1176 static struct net_device *ipoib_add_port(const char *format,
1177                                          struct ib_device *hca, u8 port)
1178 {
1179         struct ipoib_dev_priv *priv;
1180         struct ib_device_attr *device_attr;
1181         struct ib_port_attr attr;
1182         int result = -ENOMEM;
1183
1184         priv = ipoib_intf_alloc(format);
1185         if (!priv)
1186                 goto alloc_mem_failed;
1187
1188         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1189
1190         if (!ib_query_port(hca, port, &attr))
1191                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1192         else {
1193                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1194                        hca->name, port);
1195                 goto device_init_failed;
1196         }
1197
1198         /* MTU will be reset when mcast join happens */
1199         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1200         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1201
1202         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1203         if (result) {
1204                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1205                        hca->name, port, result);
1206                 goto device_init_failed;
1207         }
1208
1209         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1210         if (!device_attr) {
1211                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1212                        hca->name, sizeof *device_attr);
1213                 goto device_init_failed;
1214         }
1215
1216         result = ib_query_device(hca, device_attr);
1217         if (result) {
1218                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1219                        hca->name, result);
1220                 kfree(device_attr);
1221                 goto device_init_failed;
1222         }
1223         priv->hca_caps = device_attr->device_cap_flags;
1224
1225         kfree(device_attr);
1226
1227         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1228                 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1229                 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1230         }
1231
1232         if (lro)
1233                 priv->dev->features |= NETIF_F_LRO;
1234
1235         /*
1236          * Set the full membership bit, so that we join the right
1237          * broadcast group, etc.
1238          */
1239         priv->pkey |= 0x8000;
1240
1241         priv->dev->broadcast[8] = priv->pkey >> 8;
1242         priv->dev->broadcast[9] = priv->pkey & 0xff;
1243
1244         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1245         if (result) {
1246                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1247                        hca->name, port, result);
1248                 goto device_init_failed;
1249         } else
1250                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1251
1252         result = ipoib_dev_init(priv->dev, hca, port);
1253         if (result < 0) {
1254                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1255                        hca->name, port, result);
1256                 goto device_init_failed;
1257         }
1258
1259         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1260                               priv->ca, ipoib_event);
1261         result = ib_register_event_handler(&priv->event_handler);
1262         if (result < 0) {
1263                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1264                        "port %d (ret = %d)\n",
1265                        hca->name, port, result);
1266                 goto event_failed;
1267         }
1268
1269         if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1270                 priv->dev->features |= NETIF_F_TSO;
1271
1272         result = register_netdev(priv->dev);
1273         if (result) {
1274                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1275                        hca->name, port, result);
1276                 goto register_failed;
1277         }
1278
1279         ipoib_create_debug_files(priv->dev);
1280
1281         if (ipoib_cm_add_mode_attr(priv->dev))
1282                 goto sysfs_failed;
1283         if (ipoib_add_pkey_attr(priv->dev))
1284                 goto sysfs_failed;
1285         if (ipoib_add_umcast_attr(priv->dev))
1286                 goto sysfs_failed;
1287         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1288                 goto sysfs_failed;
1289         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1290                 goto sysfs_failed;
1291
1292         return priv->dev;
1293
1294 sysfs_failed:
1295         ipoib_delete_debug_files(priv->dev);
1296         unregister_netdev(priv->dev);
1297
1298 register_failed:
1299         ib_unregister_event_handler(&priv->event_handler);
1300         flush_workqueue(ipoib_workqueue);
1301
1302 event_failed:
1303         ipoib_dev_cleanup(priv->dev);
1304
1305 device_init_failed:
1306         free_netdev(priv->dev);
1307
1308 alloc_mem_failed:
1309         return ERR_PTR(result);
1310 }
1311
1312 static void ipoib_add_one(struct ib_device *device)
1313 {
1314         struct list_head *dev_list;
1315         struct net_device *dev;
1316         struct ipoib_dev_priv *priv;
1317         int s, e, p;
1318
1319         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1320                 return;
1321
1322         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1323         if (!dev_list)
1324                 return;
1325
1326         INIT_LIST_HEAD(dev_list);
1327
1328         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1329                 s = 0;
1330                 e = 0;
1331         } else {
1332                 s = 1;
1333                 e = device->phys_port_cnt;
1334         }
1335
1336         for (p = s; p <= e; ++p) {
1337                 dev = ipoib_add_port("ib%d", device, p);
1338                 if (!IS_ERR(dev)) {
1339                         priv = netdev_priv(dev);
1340                         list_add_tail(&priv->list, dev_list);
1341                 }
1342         }
1343
1344         ib_set_client_data(device, &ipoib_client, dev_list);
1345 }
1346
1347 static void ipoib_remove_one(struct ib_device *device)
1348 {
1349         struct ipoib_dev_priv *priv, *tmp;
1350         struct list_head *dev_list;
1351
1352         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1353                 return;
1354
1355         dev_list = ib_get_client_data(device, &ipoib_client);
1356
1357         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1358                 ib_unregister_event_handler(&priv->event_handler);
1359
1360                 rtnl_lock();
1361                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1362                 rtnl_unlock();
1363
1364                 flush_workqueue(ipoib_workqueue);
1365
1366                 unregister_netdev(priv->dev);
1367                 ipoib_dev_cleanup(priv->dev);
1368                 free_netdev(priv->dev);
1369         }
1370
1371         kfree(dev_list);
1372 }
1373
1374 static int __init ipoib_init_module(void)
1375 {
1376         int ret;
1377
1378         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1379         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1380         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1381
1382         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1383         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1384         ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE,
1385                                                      IPOIB_MIN_QUEUE_SIZE));
1386 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1387         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1388 #endif
1389
1390         /*
1391          * When copying small received packets, we only copy from the
1392          * linear data part of the SKB, so we rely on this condition.
1393          */
1394         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1395
1396         ret = ipoib_register_debugfs();
1397         if (ret)
1398                 return ret;
1399
1400         /*
1401          * We create our own workqueue mainly because we want to be
1402          * able to flush it when devices are being removed.  We can't
1403          * use schedule_work()/flush_scheduled_work() because both
1404          * unregister_netdev() and linkwatch_event take the rtnl lock,
1405          * so flush_scheduled_work() can deadlock during device
1406          * removal.
1407          */
1408         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1409         if (!ipoib_workqueue) {
1410                 ret = -ENOMEM;
1411                 goto err_fs;
1412         }
1413
1414         ib_sa_register_client(&ipoib_sa_client);
1415
1416         ret = ib_register_client(&ipoib_client);
1417         if (ret)
1418                 goto err_sa;
1419
1420         return 0;
1421
1422 err_sa:
1423         ib_sa_unregister_client(&ipoib_sa_client);
1424         destroy_workqueue(ipoib_workqueue);
1425
1426 err_fs:
1427         ipoib_unregister_debugfs();
1428
1429         return ret;
1430 }
1431
1432 static void __exit ipoib_cleanup_module(void)
1433 {
1434         ib_unregister_client(&ipoib_client);
1435         ib_sa_unregister_client(&ipoib_sa_client);
1436         ipoib_unregister_debugfs();
1437         destroy_workqueue(ipoib_workqueue);
1438 }
1439
1440 module_init(ipoib_init_module);
1441 module_exit(ipoib_cleanup_module);