neigh: Add infrastructure for allocating device neigh privates.
[~shefty/rdma-dev.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 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
64 int ipoib_debug_level;
65
66 module_param_named(debug_level, ipoib_debug_level, int, 0644);
67 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
68 #endif
69
70 struct ipoib_path_iter {
71         struct net_device *dev;
72         struct ipoib_path  path;
73 };
74
75 static const u8 ipv4_bcast_addr[] = {
76         0x00, 0xff, 0xff, 0xff,
77         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
78         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
79 };
80
81 struct workqueue_struct *ipoib_workqueue;
82
83 struct ib_sa_client ipoib_sa_client;
84
85 static void ipoib_add_one(struct ib_device *device);
86 static void ipoib_remove_one(struct ib_device *device);
87
88 static struct ib_client ipoib_client = {
89         .name   = "ipoib",
90         .add    = ipoib_add_one,
91         .remove = ipoib_remove_one
92 };
93
94 int ipoib_open(struct net_device *dev)
95 {
96         struct ipoib_dev_priv *priv = netdev_priv(dev);
97
98         ipoib_dbg(priv, "bringing up interface\n");
99
100         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
101
102         if (ipoib_pkey_dev_delay_open(dev))
103                 return 0;
104
105         if (ipoib_ib_dev_open(dev))
106                 goto err_disable;
107
108         if (ipoib_ib_dev_up(dev))
109                 goto err_stop;
110
111         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
112                 struct ipoib_dev_priv *cpriv;
113
114                 /* Bring up any child interfaces too */
115                 mutex_lock(&priv->vlan_mutex);
116                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
117                         int flags;
118
119                         flags = cpriv->dev->flags;
120                         if (flags & IFF_UP)
121                                 continue;
122
123                         dev_change_flags(cpriv->dev, flags | IFF_UP);
124                 }
125                 mutex_unlock(&priv->vlan_mutex);
126         }
127
128         netif_start_queue(dev);
129
130         return 0;
131
132 err_stop:
133         ipoib_ib_dev_stop(dev, 1);
134
135 err_disable:
136         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
137
138         return -EINVAL;
139 }
140
141 static int ipoib_stop(struct net_device *dev)
142 {
143         struct ipoib_dev_priv *priv = netdev_priv(dev);
144
145         ipoib_dbg(priv, "stopping interface\n");
146
147         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
148
149         netif_stop_queue(dev);
150
151         ipoib_ib_dev_down(dev, 0);
152         ipoib_ib_dev_stop(dev, 0);
153
154         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
155                 struct ipoib_dev_priv *cpriv;
156
157                 /* Bring down any child interfaces too */
158                 mutex_lock(&priv->vlan_mutex);
159                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
160                         int flags;
161
162                         flags = cpriv->dev->flags;
163                         if (!(flags & IFF_UP))
164                                 continue;
165
166                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
167                 }
168                 mutex_unlock(&priv->vlan_mutex);
169         }
170
171         return 0;
172 }
173
174 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
175 {
176         struct ipoib_dev_priv *priv = netdev_priv(dev);
177
178         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
179                 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
180
181         return features;
182 }
183
184 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
185 {
186         struct ipoib_dev_priv *priv = netdev_priv(dev);
187
188         /* dev->mtu > 2K ==> connected mode */
189         if (ipoib_cm_admin_enabled(dev)) {
190                 if (new_mtu > ipoib_cm_max_mtu(dev))
191                         return -EINVAL;
192
193                 if (new_mtu > priv->mcast_mtu)
194                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
195                                    priv->mcast_mtu);
196
197                 dev->mtu = new_mtu;
198                 return 0;
199         }
200
201         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
202                 return -EINVAL;
203
204         priv->admin_mtu = new_mtu;
205
206         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
207
208         return 0;
209 }
210
211 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
212 {
213         struct ipoib_dev_priv *priv = netdev_priv(dev);
214         struct rb_node *n = priv->path_tree.rb_node;
215         struct ipoib_path *path;
216         int ret;
217
218         while (n) {
219                 path = rb_entry(n, struct ipoib_path, rb_node);
220
221                 ret = memcmp(gid, path->pathrec.dgid.raw,
222                              sizeof (union ib_gid));
223
224                 if (ret < 0)
225                         n = n->rb_left;
226                 else if (ret > 0)
227                         n = n->rb_right;
228                 else
229                         return path;
230         }
231
232         return NULL;
233 }
234
235 static int __path_add(struct net_device *dev, struct ipoib_path *path)
236 {
237         struct ipoib_dev_priv *priv = netdev_priv(dev);
238         struct rb_node **n = &priv->path_tree.rb_node;
239         struct rb_node *pn = NULL;
240         struct ipoib_path *tpath;
241         int ret;
242
243         while (*n) {
244                 pn = *n;
245                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
246
247                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
248                              sizeof (union ib_gid));
249                 if (ret < 0)
250                         n = &pn->rb_left;
251                 else if (ret > 0)
252                         n = &pn->rb_right;
253                 else
254                         return -EEXIST;
255         }
256
257         rb_link_node(&path->rb_node, pn, n);
258         rb_insert_color(&path->rb_node, &priv->path_tree);
259
260         list_add_tail(&path->list, &priv->path_list);
261
262         return 0;
263 }
264
265 static void path_free(struct net_device *dev, struct ipoib_path *path)
266 {
267         struct ipoib_dev_priv *priv = netdev_priv(dev);
268         struct ipoib_neigh *neigh, *tn;
269         struct sk_buff *skb;
270         unsigned long flags;
271
272         while ((skb = __skb_dequeue(&path->queue)))
273                 dev_kfree_skb_irq(skb);
274
275         spin_lock_irqsave(&priv->lock, flags);
276
277         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
278                 /*
279                  * It's safe to call ipoib_put_ah() inside priv->lock
280                  * here, because we know that path->ah will always
281                  * hold one more reference, so ipoib_put_ah() will
282                  * never do more than decrement the ref count.
283                  */
284                 if (neigh->ah)
285                         ipoib_put_ah(neigh->ah);
286
287                 ipoib_neigh_free(dev, neigh);
288         }
289
290         spin_unlock_irqrestore(&priv->lock, flags);
291
292         if (path->ah)
293                 ipoib_put_ah(path->ah);
294
295         kfree(path);
296 }
297
298 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
299
300 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
301 {
302         struct ipoib_path_iter *iter;
303
304         iter = kmalloc(sizeof *iter, GFP_KERNEL);
305         if (!iter)
306                 return NULL;
307
308         iter->dev = dev;
309         memset(iter->path.pathrec.dgid.raw, 0, 16);
310
311         if (ipoib_path_iter_next(iter)) {
312                 kfree(iter);
313                 return NULL;
314         }
315
316         return iter;
317 }
318
319 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
320 {
321         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
322         struct rb_node *n;
323         struct ipoib_path *path;
324         int ret = 1;
325
326         spin_lock_irq(&priv->lock);
327
328         n = rb_first(&priv->path_tree);
329
330         while (n) {
331                 path = rb_entry(n, struct ipoib_path, rb_node);
332
333                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
334                            sizeof (union ib_gid)) < 0) {
335                         iter->path = *path;
336                         ret = 0;
337                         break;
338                 }
339
340                 n = rb_next(n);
341         }
342
343         spin_unlock_irq(&priv->lock);
344
345         return ret;
346 }
347
348 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
349                           struct ipoib_path *path)
350 {
351         *path = iter->path;
352 }
353
354 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
355
356 void ipoib_mark_paths_invalid(struct net_device *dev)
357 {
358         struct ipoib_dev_priv *priv = netdev_priv(dev);
359         struct ipoib_path *path, *tp;
360
361         spin_lock_irq(&priv->lock);
362
363         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
364                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
365                         be16_to_cpu(path->pathrec.dlid),
366                         path->pathrec.dgid.raw);
367                 path->valid =  0;
368         }
369
370         spin_unlock_irq(&priv->lock);
371 }
372
373 void ipoib_flush_paths(struct net_device *dev)
374 {
375         struct ipoib_dev_priv *priv = netdev_priv(dev);
376         struct ipoib_path *path, *tp;
377         LIST_HEAD(remove_list);
378         unsigned long flags;
379
380         netif_tx_lock_bh(dev);
381         spin_lock_irqsave(&priv->lock, flags);
382
383         list_splice_init(&priv->path_list, &remove_list);
384
385         list_for_each_entry(path, &remove_list, list)
386                 rb_erase(&path->rb_node, &priv->path_tree);
387
388         list_for_each_entry_safe(path, tp, &remove_list, list) {
389                 if (path->query)
390                         ib_sa_cancel_query(path->query_id, path->query);
391                 spin_unlock_irqrestore(&priv->lock, flags);
392                 netif_tx_unlock_bh(dev);
393                 wait_for_completion(&path->done);
394                 path_free(dev, path);
395                 netif_tx_lock_bh(dev);
396                 spin_lock_irqsave(&priv->lock, flags);
397         }
398
399         spin_unlock_irqrestore(&priv->lock, flags);
400         netif_tx_unlock_bh(dev);
401 }
402
403 static void path_rec_completion(int status,
404                                 struct ib_sa_path_rec *pathrec,
405                                 void *path_ptr)
406 {
407         struct ipoib_path *path = path_ptr;
408         struct net_device *dev = path->dev;
409         struct ipoib_dev_priv *priv = netdev_priv(dev);
410         struct ipoib_ah *ah = NULL;
411         struct ipoib_ah *old_ah = NULL;
412         struct ipoib_neigh *neigh, *tn;
413         struct sk_buff_head skqueue;
414         struct sk_buff *skb;
415         unsigned long flags;
416
417         if (!status)
418                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
419                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
420         else
421                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
422                           status, path->pathrec.dgid.raw);
423
424         skb_queue_head_init(&skqueue);
425
426         if (!status) {
427                 struct ib_ah_attr av;
428
429                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
430                         ah = ipoib_create_ah(dev, priv->pd, &av);
431         }
432
433         spin_lock_irqsave(&priv->lock, flags);
434
435         if (ah) {
436                 path->pathrec = *pathrec;
437
438                 old_ah   = path->ah;
439                 path->ah = ah;
440
441                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
442                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
443
444                 while ((skb = __skb_dequeue(&path->queue)))
445                         __skb_queue_tail(&skqueue, skb);
446
447                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
448                         if (neigh->ah) {
449                                 WARN_ON(neigh->ah != old_ah);
450                                 /*
451                                  * Dropping the ah reference inside
452                                  * priv->lock is safe here, because we
453                                  * will hold one more reference from
454                                  * the original value of path->ah (ie
455                                  * old_ah).
456                                  */
457                                 ipoib_put_ah(neigh->ah);
458                         }
459                         kref_get(&path->ah->ref);
460                         neigh->ah = path->ah;
461                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
462                                sizeof(union ib_gid));
463
464                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
465                                 if (!ipoib_cm_get(neigh))
466                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
467                                                                                path,
468                                                                                neigh));
469                                 if (!ipoib_cm_get(neigh)) {
470                                         list_del(&neigh->list);
471                                         if (neigh->ah)
472                                                 ipoib_put_ah(neigh->ah);
473                                         ipoib_neigh_free(dev, neigh);
474                                         continue;
475                                 }
476                         }
477
478                         while ((skb = __skb_dequeue(&neigh->queue)))
479                                 __skb_queue_tail(&skqueue, skb);
480                 }
481                 path->valid = 1;
482         }
483
484         path->query = NULL;
485         complete(&path->done);
486
487         spin_unlock_irqrestore(&priv->lock, flags);
488
489         if (old_ah)
490                 ipoib_put_ah(old_ah);
491
492         while ((skb = __skb_dequeue(&skqueue))) {
493                 skb->dev = dev;
494                 if (dev_queue_xmit(skb))
495                         ipoib_warn(priv, "dev_queue_xmit failed "
496                                    "to requeue packet\n");
497         }
498 }
499
500 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
501 {
502         struct ipoib_dev_priv *priv = netdev_priv(dev);
503         struct ipoib_path *path;
504
505         if (!priv->broadcast)
506                 return NULL;
507
508         path = kzalloc(sizeof *path, GFP_ATOMIC);
509         if (!path)
510                 return NULL;
511
512         path->dev = dev;
513
514         skb_queue_head_init(&path->queue);
515
516         INIT_LIST_HEAD(&path->neigh_list);
517
518         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
519         path->pathrec.sgid          = priv->local_gid;
520         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
521         path->pathrec.numb_path     = 1;
522         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
523
524         return path;
525 }
526
527 static int path_rec_start(struct net_device *dev,
528                           struct ipoib_path *path)
529 {
530         struct ipoib_dev_priv *priv = netdev_priv(dev);
531
532         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
533                   path->pathrec.dgid.raw);
534
535         init_completion(&path->done);
536
537         path->query_id =
538                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
539                                    &path->pathrec,
540                                    IB_SA_PATH_REC_DGID          |
541                                    IB_SA_PATH_REC_SGID          |
542                                    IB_SA_PATH_REC_NUMB_PATH     |
543                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
544                                    IB_SA_PATH_REC_PKEY,
545                                    1000, GFP_ATOMIC,
546                                    path_rec_completion,
547                                    path, &path->query);
548         if (path->query_id < 0) {
549                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
550                 path->query = NULL;
551                 complete(&path->done);
552                 return path->query_id;
553         }
554
555         return 0;
556 }
557
558 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
559 {
560         struct ipoib_dev_priv *priv = netdev_priv(dev);
561         struct ipoib_path *path;
562         struct ipoib_neigh *neigh;
563         struct neighbour *n;
564         unsigned long flags;
565
566         n = dst_get_neighbour(skb_dst(skb));
567         neigh = ipoib_neigh_alloc(n, skb->dev);
568         if (!neigh) {
569                 ++dev->stats.tx_dropped;
570                 dev_kfree_skb_any(skb);
571                 return;
572         }
573
574         spin_lock_irqsave(&priv->lock, flags);
575
576         path = __path_find(dev, n->ha + 4);
577         if (!path) {
578                 path = path_rec_create(dev, n->ha + 4);
579                 if (!path)
580                         goto err_path;
581
582                 __path_add(dev, path);
583         }
584
585         list_add_tail(&neigh->list, &path->neigh_list);
586
587         if (path->ah) {
588                 kref_get(&path->ah->ref);
589                 neigh->ah = path->ah;
590                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
591                        sizeof(union ib_gid));
592
593                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
594                         if (!ipoib_cm_get(neigh))
595                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
596                         if (!ipoib_cm_get(neigh)) {
597                                 list_del(&neigh->list);
598                                 if (neigh->ah)
599                                         ipoib_put_ah(neigh->ah);
600                                 ipoib_neigh_free(dev, neigh);
601                                 goto err_drop;
602                         }
603                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
604                                 __skb_queue_tail(&neigh->queue, skb);
605                         else {
606                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
607                                            skb_queue_len(&neigh->queue));
608                                 goto err_drop;
609                         }
610                 } else {
611                         spin_unlock_irqrestore(&priv->lock, flags);
612                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(n->ha));
613                         return;
614                 }
615         } else {
616                 neigh->ah  = NULL;
617
618                 if (!path->query && path_rec_start(dev, path))
619                         goto err_list;
620
621                 __skb_queue_tail(&neigh->queue, skb);
622         }
623
624         spin_unlock_irqrestore(&priv->lock, flags);
625         return;
626
627 err_list:
628         list_del(&neigh->list);
629
630 err_path:
631         ipoib_neigh_free(dev, neigh);
632 err_drop:
633         ++dev->stats.tx_dropped;
634         dev_kfree_skb_any(skb);
635
636         spin_unlock_irqrestore(&priv->lock, flags);
637 }
638
639 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
640 {
641         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
642         struct dst_entry *dst = skb_dst(skb);
643         struct neighbour *n;
644
645         /* Look up path record for unicasts */
646         n = dst_get_neighbour(dst);
647         if (n->ha[4] != 0xff) {
648                 neigh_add_path(skb, dev);
649                 return;
650         }
651
652         /* Add in the P_Key for multicasts */
653         n->ha[8] = (priv->pkey >> 8) & 0xff;
654         n->ha[9] = priv->pkey & 0xff;
655         ipoib_mcast_send(dev, n->ha + 4, skb);
656 }
657
658 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
659                              struct ipoib_pseudoheader *phdr)
660 {
661         struct ipoib_dev_priv *priv = netdev_priv(dev);
662         struct ipoib_path *path;
663         unsigned long flags;
664
665         spin_lock_irqsave(&priv->lock, flags);
666
667         path = __path_find(dev, phdr->hwaddr + 4);
668         if (!path || !path->valid) {
669                 int new_path = 0;
670
671                 if (!path) {
672                         path = path_rec_create(dev, phdr->hwaddr + 4);
673                         new_path = 1;
674                 }
675                 if (path) {
676                         /* put pseudoheader back on for next time */
677                         skb_push(skb, sizeof *phdr);
678                         __skb_queue_tail(&path->queue, skb);
679
680                         if (!path->query && path_rec_start(dev, path)) {
681                                 spin_unlock_irqrestore(&priv->lock, flags);
682                                 if (new_path)
683                                         path_free(dev, path);
684                                 return;
685                         } else
686                                 __path_add(dev, path);
687                 } else {
688                         ++dev->stats.tx_dropped;
689                         dev_kfree_skb_any(skb);
690                 }
691
692                 spin_unlock_irqrestore(&priv->lock, flags);
693                 return;
694         }
695
696         if (path->ah) {
697                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
698                           be16_to_cpu(path->pathrec.dlid));
699
700                 spin_unlock_irqrestore(&priv->lock, flags);
701                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
702                 return;
703         } else if ((path->query || !path_rec_start(dev, path)) &&
704                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
705                 /* put pseudoheader back on for next time */
706                 skb_push(skb, sizeof *phdr);
707                 __skb_queue_tail(&path->queue, skb);
708         } else {
709                 ++dev->stats.tx_dropped;
710                 dev_kfree_skb_any(skb);
711         }
712
713         spin_unlock_irqrestore(&priv->lock, flags);
714 }
715
716 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
717 {
718         struct ipoib_dev_priv *priv = netdev_priv(dev);
719         struct ipoib_neigh *neigh;
720         struct neighbour *n = NULL;
721         unsigned long flags;
722
723         if (likely(skb_dst(skb)))
724                 n = dst_get_neighbour(skb_dst(skb));
725
726         if (likely(n)) {
727                 if (unlikely(!*to_ipoib_neigh(n))) {
728                         ipoib_path_lookup(skb, dev);
729                         return NETDEV_TX_OK;
730                 }
731
732                 neigh = *to_ipoib_neigh(n);
733
734                 if (unlikely((memcmp(&neigh->dgid.raw,
735                                      n->ha + 4,
736                                      sizeof(union ib_gid))) ||
737                              (neigh->dev != dev))) {
738                         spin_lock_irqsave(&priv->lock, flags);
739                         /*
740                          * It's safe to call ipoib_put_ah() inside
741                          * priv->lock here, because we know that
742                          * path->ah will always hold one more reference,
743                          * so ipoib_put_ah() will never do more than
744                          * decrement the ref count.
745                          */
746                         if (neigh->ah)
747                                 ipoib_put_ah(neigh->ah);
748                         list_del(&neigh->list);
749                         ipoib_neigh_free(dev, neigh);
750                         spin_unlock_irqrestore(&priv->lock, flags);
751                         ipoib_path_lookup(skb, dev);
752                         return NETDEV_TX_OK;
753                 }
754
755                 if (ipoib_cm_get(neigh)) {
756                         if (ipoib_cm_up(neigh)) {
757                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
758                                 return NETDEV_TX_OK;
759                         }
760                 } else if (neigh->ah) {
761                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(n->ha));
762                         return NETDEV_TX_OK;
763                 }
764
765                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
766                         spin_lock_irqsave(&priv->lock, flags);
767                         __skb_queue_tail(&neigh->queue, skb);
768                         spin_unlock_irqrestore(&priv->lock, flags);
769                 } else {
770                         ++dev->stats.tx_dropped;
771                         dev_kfree_skb_any(skb);
772                 }
773         } else {
774                 struct ipoib_pseudoheader *phdr =
775                         (struct ipoib_pseudoheader *) skb->data;
776                 skb_pull(skb, sizeof *phdr);
777
778                 if (phdr->hwaddr[4] == 0xff) {
779                         /* Add in the P_Key for multicast*/
780                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
781                         phdr->hwaddr[9] = priv->pkey & 0xff;
782
783                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
784                 } else {
785                         /* unicast GID -- should be ARP or RARP reply */
786
787                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
788                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
789                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
790                                            skb_dst(skb) ? "neigh" : "dst",
791                                            be16_to_cpup((__be16 *) skb->data),
792                                            IPOIB_QPN(phdr->hwaddr),
793                                            phdr->hwaddr + 4);
794                                 dev_kfree_skb_any(skb);
795                                 ++dev->stats.tx_dropped;
796                                 return NETDEV_TX_OK;
797                         }
798
799                         unicast_arp_send(skb, dev, phdr);
800                 }
801         }
802
803         return NETDEV_TX_OK;
804 }
805
806 static void ipoib_timeout(struct net_device *dev)
807 {
808         struct ipoib_dev_priv *priv = netdev_priv(dev);
809
810         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
811                    jiffies_to_msecs(jiffies - dev->trans_start));
812         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
813                    netif_queue_stopped(dev),
814                    priv->tx_head, priv->tx_tail);
815         /* XXX reset QP, etc. */
816 }
817
818 static int ipoib_hard_header(struct sk_buff *skb,
819                              struct net_device *dev,
820                              unsigned short type,
821                              const void *daddr, const void *saddr, unsigned len)
822 {
823         struct ipoib_header *header;
824         struct dst_entry *dst;
825         struct neighbour *n;
826
827         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
828
829         header->proto = htons(type);
830         header->reserved = 0;
831
832         /*
833          * If we don't have a neighbour structure, stuff the
834          * destination address onto the front of the skb so we can
835          * figure out where to send the packet later.
836          */
837         dst = skb_dst(skb);
838         n = NULL;
839         if (dst)
840                 n = dst_get_neighbour(dst);
841         if ((!dst || !n) && daddr) {
842                 struct ipoib_pseudoheader *phdr =
843                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
844                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
845         }
846
847         return 0;
848 }
849
850 static void ipoib_set_mcast_list(struct net_device *dev)
851 {
852         struct ipoib_dev_priv *priv = netdev_priv(dev);
853
854         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
855                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
856                 return;
857         }
858
859         queue_work(ipoib_workqueue, &priv->restart_task);
860 }
861
862 static void ipoib_neigh_cleanup(struct neighbour *n)
863 {
864         struct ipoib_neigh *neigh;
865         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
866         unsigned long flags;
867         struct ipoib_ah *ah = NULL;
868
869         neigh = *to_ipoib_neigh(n);
870         if (neigh)
871                 priv = netdev_priv(neigh->dev);
872         else
873                 return;
874         ipoib_dbg(priv,
875                   "neigh_cleanup for %06x %pI6\n",
876                   IPOIB_QPN(n->ha),
877                   n->ha + 4);
878
879         spin_lock_irqsave(&priv->lock, flags);
880
881         if (neigh->ah)
882                 ah = neigh->ah;
883         list_del(&neigh->list);
884         ipoib_neigh_free(n->dev, neigh);
885
886         spin_unlock_irqrestore(&priv->lock, flags);
887
888         if (ah)
889                 ipoib_put_ah(ah);
890 }
891
892 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
893                                       struct net_device *dev)
894 {
895         struct ipoib_neigh *neigh;
896
897         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
898         if (!neigh)
899                 return NULL;
900
901         neigh->neighbour = neighbour;
902         neigh->dev = dev;
903         memset(&neigh->dgid.raw, 0, sizeof (union ib_gid));
904         *to_ipoib_neigh(neighbour) = neigh;
905         skb_queue_head_init(&neigh->queue);
906         ipoib_cm_set(neigh, NULL);
907
908         return neigh;
909 }
910
911 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
912 {
913         struct sk_buff *skb;
914         *to_ipoib_neigh(neigh->neighbour) = NULL;
915         while ((skb = __skb_dequeue(&neigh->queue))) {
916                 ++dev->stats.tx_dropped;
917                 dev_kfree_skb_any(skb);
918         }
919         if (ipoib_cm_get(neigh))
920                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
921         kfree(neigh);
922 }
923
924 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
925 {
926         parms->neigh_cleanup = ipoib_neigh_cleanup;
927
928         return 0;
929 }
930
931 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
932 {
933         struct ipoib_dev_priv *priv = netdev_priv(dev);
934
935         /* Allocate RX/TX "rings" to hold queued skbs */
936         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
937                                 GFP_KERNEL);
938         if (!priv->rx_ring) {
939                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
940                        ca->name, ipoib_recvq_size);
941                 goto out;
942         }
943
944         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
945         if (!priv->tx_ring) {
946                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
947                        ca->name, ipoib_sendq_size);
948                 goto out_rx_ring_cleanup;
949         }
950
951         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
952
953         if (ipoib_ib_dev_init(dev, ca, port))
954                 goto out_tx_ring_cleanup;
955
956         return 0;
957
958 out_tx_ring_cleanup:
959         vfree(priv->tx_ring);
960
961 out_rx_ring_cleanup:
962         kfree(priv->rx_ring);
963
964 out:
965         return -ENOMEM;
966 }
967
968 void ipoib_dev_cleanup(struct net_device *dev)
969 {
970         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
971
972         ipoib_delete_debug_files(dev);
973
974         /* Delete any child interfaces first */
975         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
976                 unregister_netdev(cpriv->dev);
977                 ipoib_dev_cleanup(cpriv->dev);
978                 free_netdev(cpriv->dev);
979         }
980
981         ipoib_ib_dev_cleanup(dev);
982
983         kfree(priv->rx_ring);
984         vfree(priv->tx_ring);
985
986         priv->rx_ring = NULL;
987         priv->tx_ring = NULL;
988 }
989
990 static const struct header_ops ipoib_header_ops = {
991         .create = ipoib_hard_header,
992 };
993
994 static const struct net_device_ops ipoib_netdev_ops = {
995         .ndo_open                = ipoib_open,
996         .ndo_stop                = ipoib_stop,
997         .ndo_change_mtu          = ipoib_change_mtu,
998         .ndo_fix_features        = ipoib_fix_features,
999         .ndo_start_xmit          = ipoib_start_xmit,
1000         .ndo_tx_timeout          = ipoib_timeout,
1001         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1002         .ndo_neigh_setup         = ipoib_neigh_setup_dev,
1003 };
1004
1005 static void ipoib_setup(struct net_device *dev)
1006 {
1007         struct ipoib_dev_priv *priv = netdev_priv(dev);
1008
1009         dev->netdev_ops          = &ipoib_netdev_ops;
1010         dev->header_ops          = &ipoib_header_ops;
1011
1012         ipoib_set_ethtool_ops(dev);
1013
1014         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1015
1016         dev->watchdog_timeo      = HZ;
1017
1018         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1019
1020         /*
1021          * We add in INFINIBAND_ALEN to allow for the destination
1022          * address "pseudoheader" for skbs without neighbour struct.
1023          */
1024         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1025         dev->addr_len            = INFINIBAND_ALEN;
1026         dev->type                = ARPHRD_INFINIBAND;
1027         dev->tx_queue_len        = ipoib_sendq_size * 2;
1028         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1029                                     NETIF_F_HIGHDMA);
1030         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
1031
1032         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1033
1034         netif_carrier_off(dev);
1035
1036         priv->dev = dev;
1037
1038         spin_lock_init(&priv->lock);
1039
1040         mutex_init(&priv->vlan_mutex);
1041
1042         INIT_LIST_HEAD(&priv->path_list);
1043         INIT_LIST_HEAD(&priv->child_intfs);
1044         INIT_LIST_HEAD(&priv->dead_ahs);
1045         INIT_LIST_HEAD(&priv->multicast_list);
1046
1047         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1048         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1049         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1050         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1051         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1052         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1053         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1054         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1055 }
1056
1057 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1058 {
1059         struct net_device *dev;
1060
1061         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1062                            ipoib_setup);
1063         if (!dev)
1064                 return NULL;
1065
1066         return netdev_priv(dev);
1067 }
1068
1069 static ssize_t show_pkey(struct device *dev,
1070                          struct device_attribute *attr, char *buf)
1071 {
1072         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1073
1074         return sprintf(buf, "0x%04x\n", priv->pkey);
1075 }
1076 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1077
1078 static ssize_t show_umcast(struct device *dev,
1079                            struct device_attribute *attr, char *buf)
1080 {
1081         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1082
1083         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1084 }
1085
1086 static ssize_t set_umcast(struct device *dev,
1087                           struct device_attribute *attr,
1088                           const char *buf, size_t count)
1089 {
1090         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1091         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1092
1093         if (umcast_val > 0) {
1094                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1095                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1096                                 "by userspace\n");
1097         } else
1098                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1099
1100         return count;
1101 }
1102 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1103
1104 int ipoib_add_umcast_attr(struct net_device *dev)
1105 {
1106         return device_create_file(&dev->dev, &dev_attr_umcast);
1107 }
1108
1109 static ssize_t create_child(struct device *dev,
1110                             struct device_attribute *attr,
1111                             const char *buf, size_t count)
1112 {
1113         int pkey;
1114         int ret;
1115
1116         if (sscanf(buf, "%i", &pkey) != 1)
1117                 return -EINVAL;
1118
1119         if (pkey < 0 || pkey > 0xffff)
1120                 return -EINVAL;
1121
1122         /*
1123          * Set the full membership bit, so that we join the right
1124          * broadcast group, etc.
1125          */
1126         pkey |= 0x8000;
1127
1128         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1129
1130         return ret ? ret : count;
1131 }
1132 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1133
1134 static ssize_t delete_child(struct device *dev,
1135                             struct device_attribute *attr,
1136                             const char *buf, size_t count)
1137 {
1138         int pkey;
1139         int ret;
1140
1141         if (sscanf(buf, "%i", &pkey) != 1)
1142                 return -EINVAL;
1143
1144         if (pkey < 0 || pkey > 0xffff)
1145                 return -EINVAL;
1146
1147         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1148
1149         return ret ? ret : count;
1150
1151 }
1152 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1153
1154 int ipoib_add_pkey_attr(struct net_device *dev)
1155 {
1156         return device_create_file(&dev->dev, &dev_attr_pkey);
1157 }
1158
1159 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1160 {
1161         struct ib_device_attr *device_attr;
1162         int result = -ENOMEM;
1163
1164         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1165         if (!device_attr) {
1166                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1167                        hca->name, sizeof *device_attr);
1168                 return result;
1169         }
1170
1171         result = ib_query_device(hca, device_attr);
1172         if (result) {
1173                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1174                        hca->name, result);
1175                 kfree(device_attr);
1176                 return result;
1177         }
1178         priv->hca_caps = device_attr->device_cap_flags;
1179
1180         kfree(device_attr);
1181
1182         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1183                 priv->dev->hw_features = NETIF_F_SG |
1184                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1185
1186                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1187                         priv->dev->hw_features |= NETIF_F_TSO;
1188
1189                 priv->dev->features |= priv->dev->hw_features;
1190         }
1191
1192         return 0;
1193 }
1194
1195 static struct net_device *ipoib_add_port(const char *format,
1196                                          struct ib_device *hca, u8 port)
1197 {
1198         struct ipoib_dev_priv *priv;
1199         struct ib_port_attr attr;
1200         int result = -ENOMEM;
1201
1202         priv = ipoib_intf_alloc(format);
1203         if (!priv)
1204                 goto alloc_mem_failed;
1205
1206         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1207         priv->dev->dev_id = port - 1;
1208
1209         if (!ib_query_port(hca, port, &attr))
1210                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1211         else {
1212                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1213                        hca->name, port);
1214                 goto device_init_failed;
1215         }
1216
1217         /* MTU will be reset when mcast join happens */
1218         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1219         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1220
1221         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1222
1223         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1224         if (result) {
1225                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1226                        hca->name, port, result);
1227                 goto device_init_failed;
1228         }
1229
1230         if (ipoib_set_dev_features(priv, hca))
1231                 goto device_init_failed;
1232
1233         /*
1234          * Set the full membership bit, so that we join the right
1235          * broadcast group, etc.
1236          */
1237         priv->pkey |= 0x8000;
1238
1239         priv->dev->broadcast[8] = priv->pkey >> 8;
1240         priv->dev->broadcast[9] = priv->pkey & 0xff;
1241
1242         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1243         if (result) {
1244                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1245                        hca->name, port, result);
1246                 goto device_init_failed;
1247         } else
1248                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1249
1250         result = ipoib_dev_init(priv->dev, hca, port);
1251         if (result < 0) {
1252                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1253                        hca->name, port, result);
1254                 goto device_init_failed;
1255         }
1256
1257         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1258                               priv->ca, ipoib_event);
1259         result = ib_register_event_handler(&priv->event_handler);
1260         if (result < 0) {
1261                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1262                        "port %d (ret = %d)\n",
1263                        hca->name, port, result);
1264                 goto event_failed;
1265         }
1266
1267         result = register_netdev(priv->dev);
1268         if (result) {
1269                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1270                        hca->name, port, result);
1271                 goto register_failed;
1272         }
1273
1274         ipoib_create_debug_files(priv->dev);
1275
1276         if (ipoib_cm_add_mode_attr(priv->dev))
1277                 goto sysfs_failed;
1278         if (ipoib_add_pkey_attr(priv->dev))
1279                 goto sysfs_failed;
1280         if (ipoib_add_umcast_attr(priv->dev))
1281                 goto sysfs_failed;
1282         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1283                 goto sysfs_failed;
1284         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1285                 goto sysfs_failed;
1286
1287         return priv->dev;
1288
1289 sysfs_failed:
1290         ipoib_delete_debug_files(priv->dev);
1291         unregister_netdev(priv->dev);
1292
1293 register_failed:
1294         ib_unregister_event_handler(&priv->event_handler);
1295         flush_workqueue(ipoib_workqueue);
1296
1297 event_failed:
1298         ipoib_dev_cleanup(priv->dev);
1299
1300 device_init_failed:
1301         free_netdev(priv->dev);
1302
1303 alloc_mem_failed:
1304         return ERR_PTR(result);
1305 }
1306
1307 static void ipoib_add_one(struct ib_device *device)
1308 {
1309         struct list_head *dev_list;
1310         struct net_device *dev;
1311         struct ipoib_dev_priv *priv;
1312         int s, e, p;
1313
1314         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1315                 return;
1316
1317         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1318         if (!dev_list)
1319                 return;
1320
1321         INIT_LIST_HEAD(dev_list);
1322
1323         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1324                 s = 0;
1325                 e = 0;
1326         } else {
1327                 s = 1;
1328                 e = device->phys_port_cnt;
1329         }
1330
1331         for (p = s; p <= e; ++p) {
1332                 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1333                         continue;
1334                 dev = ipoib_add_port("ib%d", device, p);
1335                 if (!IS_ERR(dev)) {
1336                         priv = netdev_priv(dev);
1337                         list_add_tail(&priv->list, dev_list);
1338                 }
1339         }
1340
1341         ib_set_client_data(device, &ipoib_client, dev_list);
1342 }
1343
1344 static void ipoib_remove_one(struct ib_device *device)
1345 {
1346         struct ipoib_dev_priv *priv, *tmp;
1347         struct list_head *dev_list;
1348
1349         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1350                 return;
1351
1352         dev_list = ib_get_client_data(device, &ipoib_client);
1353
1354         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1355                 ib_unregister_event_handler(&priv->event_handler);
1356
1357                 rtnl_lock();
1358                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1359                 rtnl_unlock();
1360
1361                 flush_workqueue(ipoib_workqueue);
1362
1363                 unregister_netdev(priv->dev);
1364                 ipoib_dev_cleanup(priv->dev);
1365                 free_netdev(priv->dev);
1366         }
1367
1368         kfree(dev_list);
1369 }
1370
1371 static int __init ipoib_init_module(void)
1372 {
1373         int ret;
1374
1375         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1376         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1377         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1378
1379         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1380         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1381         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1382 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1383         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1384 #endif
1385
1386         /*
1387          * When copying small received packets, we only copy from the
1388          * linear data part of the SKB, so we rely on this condition.
1389          */
1390         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1391
1392         ret = ipoib_register_debugfs();
1393         if (ret)
1394                 return ret;
1395
1396         /*
1397          * We create our own workqueue mainly because we want to be
1398          * able to flush it when devices are being removed.  We can't
1399          * use schedule_work()/flush_scheduled_work() because both
1400          * unregister_netdev() and linkwatch_event take the rtnl lock,
1401          * so flush_scheduled_work() can deadlock during device
1402          * removal.
1403          */
1404         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1405         if (!ipoib_workqueue) {
1406                 ret = -ENOMEM;
1407                 goto err_fs;
1408         }
1409
1410         ib_sa_register_client(&ipoib_sa_client);
1411
1412         ret = ib_register_client(&ipoib_client);
1413         if (ret)
1414                 goto err_sa;
1415
1416         return 0;
1417
1418 err_sa:
1419         ib_sa_unregister_client(&ipoib_sa_client);
1420         destroy_workqueue(ipoib_workqueue);
1421
1422 err_fs:
1423         ipoib_unregister_debugfs();
1424
1425         return ret;
1426 }
1427
1428 static void __exit ipoib_cleanup_module(void)
1429 {
1430         ib_unregister_client(&ipoib_client);
1431         ib_sa_unregister_client(&ipoib_sa_client);
1432         ipoib_unregister_debugfs();
1433         destroy_workqueue(ipoib_workqueue);
1434 }
1435
1436 module_init(ipoib_init_module);
1437 module_exit(ipoib_cleanup_module);