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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[~andy/linux] / 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 <linux/jhash.h>
50 #include <net/arp.h>
51
52 MODULE_AUTHOR("Roland Dreier");
53 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
54 MODULE_LICENSE("Dual BSD/GPL");
55
56 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
57 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
58
59 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
60 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
61 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
62 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
63
64 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
65 int ipoib_debug_level;
66
67 module_param_named(debug_level, ipoib_debug_level, int, 0644);
68 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
69 #endif
70
71 struct ipoib_path_iter {
72         struct net_device *dev;
73         struct ipoib_path  path;
74 };
75
76 static const u8 ipv4_bcast_addr[] = {
77         0x00, 0xff, 0xff, 0xff,
78         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
79         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
80 };
81
82 struct workqueue_struct *ipoib_workqueue;
83
84 struct ib_sa_client ipoib_sa_client;
85
86 static void ipoib_add_one(struct ib_device *device);
87 static void ipoib_remove_one(struct ib_device *device);
88 static void ipoib_neigh_reclaim(struct rcu_head *rp);
89
90 static struct ib_client ipoib_client = {
91         .name   = "ipoib",
92         .add    = ipoib_add_one,
93         .remove = ipoib_remove_one
94 };
95
96 int ipoib_open(struct net_device *dev)
97 {
98         struct ipoib_dev_priv *priv = netdev_priv(dev);
99
100         ipoib_dbg(priv, "bringing up interface\n");
101
102         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
103
104         if (ipoib_pkey_dev_delay_open(dev))
105                 return 0;
106
107         if (ipoib_ib_dev_open(dev))
108                 goto err_disable;
109
110         if (ipoib_ib_dev_up(dev))
111                 goto err_stop;
112
113         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
114                 struct ipoib_dev_priv *cpriv;
115
116                 /* Bring up any child interfaces too */
117                 mutex_lock(&priv->vlan_mutex);
118                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
119                         int flags;
120
121                         flags = cpriv->dev->flags;
122                         if (flags & IFF_UP)
123                                 continue;
124
125                         dev_change_flags(cpriv->dev, flags | IFF_UP);
126                 }
127                 mutex_unlock(&priv->vlan_mutex);
128         }
129
130         netif_start_queue(dev);
131
132         return 0;
133
134 err_stop:
135         ipoib_ib_dev_stop(dev, 1);
136
137 err_disable:
138         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
139
140         return -EINVAL;
141 }
142
143 static int ipoib_stop(struct net_device *dev)
144 {
145         struct ipoib_dev_priv *priv = netdev_priv(dev);
146
147         ipoib_dbg(priv, "stopping interface\n");
148
149         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
150
151         netif_stop_queue(dev);
152
153         ipoib_ib_dev_down(dev, 0);
154         ipoib_ib_dev_stop(dev, 0);
155
156         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
157                 struct ipoib_dev_priv *cpriv;
158
159                 /* Bring down any child interfaces too */
160                 mutex_lock(&priv->vlan_mutex);
161                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
162                         int flags;
163
164                         flags = cpriv->dev->flags;
165                         if (!(flags & IFF_UP))
166                                 continue;
167
168                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
169                 }
170                 mutex_unlock(&priv->vlan_mutex);
171         }
172
173         return 0;
174 }
175
176 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
177 {
178         struct ipoib_dev_priv *priv = netdev_priv(dev);
179
180         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
181                 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
182
183         return features;
184 }
185
186 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
187 {
188         struct ipoib_dev_priv *priv = netdev_priv(dev);
189
190         /* dev->mtu > 2K ==> connected mode */
191         if (ipoib_cm_admin_enabled(dev)) {
192                 if (new_mtu > ipoib_cm_max_mtu(dev))
193                         return -EINVAL;
194
195                 if (new_mtu > priv->mcast_mtu)
196                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
197                                    priv->mcast_mtu);
198
199                 dev->mtu = new_mtu;
200                 return 0;
201         }
202
203         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
204                 return -EINVAL;
205
206         priv->admin_mtu = new_mtu;
207
208         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
209
210         return 0;
211 }
212
213 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
214 {
215         struct ipoib_dev_priv *priv = netdev_priv(dev);
216         struct rb_node *n = priv->path_tree.rb_node;
217         struct ipoib_path *path;
218         int ret;
219
220         while (n) {
221                 path = rb_entry(n, struct ipoib_path, rb_node);
222
223                 ret = memcmp(gid, path->pathrec.dgid.raw,
224                              sizeof (union ib_gid));
225
226                 if (ret < 0)
227                         n = n->rb_left;
228                 else if (ret > 0)
229                         n = n->rb_right;
230                 else
231                         return path;
232         }
233
234         return NULL;
235 }
236
237 static int __path_add(struct net_device *dev, struct ipoib_path *path)
238 {
239         struct ipoib_dev_priv *priv = netdev_priv(dev);
240         struct rb_node **n = &priv->path_tree.rb_node;
241         struct rb_node *pn = NULL;
242         struct ipoib_path *tpath;
243         int ret;
244
245         while (*n) {
246                 pn = *n;
247                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
248
249                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
250                              sizeof (union ib_gid));
251                 if (ret < 0)
252                         n = &pn->rb_left;
253                 else if (ret > 0)
254                         n = &pn->rb_right;
255                 else
256                         return -EEXIST;
257         }
258
259         rb_link_node(&path->rb_node, pn, n);
260         rb_insert_color(&path->rb_node, &priv->path_tree);
261
262         list_add_tail(&path->list, &priv->path_list);
263
264         return 0;
265 }
266
267 static void path_free(struct net_device *dev, struct ipoib_path *path)
268 {
269         struct sk_buff *skb;
270
271         while ((skb = __skb_dequeue(&path->queue)))
272                 dev_kfree_skb_irq(skb);
273
274         ipoib_dbg(netdev_priv(dev), "path_free\n");
275
276         /* remove all neigh connected to this path */
277         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
278
279         if (path->ah)
280                 ipoib_put_ah(path->ah);
281
282         kfree(path);
283 }
284
285 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
286
287 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
288 {
289         struct ipoib_path_iter *iter;
290
291         iter = kmalloc(sizeof *iter, GFP_KERNEL);
292         if (!iter)
293                 return NULL;
294
295         iter->dev = dev;
296         memset(iter->path.pathrec.dgid.raw, 0, 16);
297
298         if (ipoib_path_iter_next(iter)) {
299                 kfree(iter);
300                 return NULL;
301         }
302
303         return iter;
304 }
305
306 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
307 {
308         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
309         struct rb_node *n;
310         struct ipoib_path *path;
311         int ret = 1;
312
313         spin_lock_irq(&priv->lock);
314
315         n = rb_first(&priv->path_tree);
316
317         while (n) {
318                 path = rb_entry(n, struct ipoib_path, rb_node);
319
320                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
321                            sizeof (union ib_gid)) < 0) {
322                         iter->path = *path;
323                         ret = 0;
324                         break;
325                 }
326
327                 n = rb_next(n);
328         }
329
330         spin_unlock_irq(&priv->lock);
331
332         return ret;
333 }
334
335 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
336                           struct ipoib_path *path)
337 {
338         *path = iter->path;
339 }
340
341 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
342
343 void ipoib_mark_paths_invalid(struct net_device *dev)
344 {
345         struct ipoib_dev_priv *priv = netdev_priv(dev);
346         struct ipoib_path *path, *tp;
347
348         spin_lock_irq(&priv->lock);
349
350         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
351                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
352                         be16_to_cpu(path->pathrec.dlid),
353                         path->pathrec.dgid.raw);
354                 path->valid =  0;
355         }
356
357         spin_unlock_irq(&priv->lock);
358 }
359
360 void ipoib_flush_paths(struct net_device *dev)
361 {
362         struct ipoib_dev_priv *priv = netdev_priv(dev);
363         struct ipoib_path *path, *tp;
364         LIST_HEAD(remove_list);
365         unsigned long flags;
366
367         netif_tx_lock_bh(dev);
368         spin_lock_irqsave(&priv->lock, flags);
369
370         list_splice_init(&priv->path_list, &remove_list);
371
372         list_for_each_entry(path, &remove_list, list)
373                 rb_erase(&path->rb_node, &priv->path_tree);
374
375         list_for_each_entry_safe(path, tp, &remove_list, list) {
376                 if (path->query)
377                         ib_sa_cancel_query(path->query_id, path->query);
378                 spin_unlock_irqrestore(&priv->lock, flags);
379                 netif_tx_unlock_bh(dev);
380                 wait_for_completion(&path->done);
381                 path_free(dev, path);
382                 netif_tx_lock_bh(dev);
383                 spin_lock_irqsave(&priv->lock, flags);
384         }
385
386         spin_unlock_irqrestore(&priv->lock, flags);
387         netif_tx_unlock_bh(dev);
388 }
389
390 static void path_rec_completion(int status,
391                                 struct ib_sa_path_rec *pathrec,
392                                 void *path_ptr)
393 {
394         struct ipoib_path *path = path_ptr;
395         struct net_device *dev = path->dev;
396         struct ipoib_dev_priv *priv = netdev_priv(dev);
397         struct ipoib_ah *ah = NULL;
398         struct ipoib_ah *old_ah = NULL;
399         struct ipoib_neigh *neigh, *tn;
400         struct sk_buff_head skqueue;
401         struct sk_buff *skb;
402         unsigned long flags;
403
404         if (!status)
405                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
406                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
407         else
408                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
409                           status, path->pathrec.dgid.raw);
410
411         skb_queue_head_init(&skqueue);
412
413         if (!status) {
414                 struct ib_ah_attr av;
415
416                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
417                         ah = ipoib_create_ah(dev, priv->pd, &av);
418         }
419
420         spin_lock_irqsave(&priv->lock, flags);
421
422         if (!IS_ERR_OR_NULL(ah)) {
423                 path->pathrec = *pathrec;
424
425                 old_ah   = path->ah;
426                 path->ah = ah;
427
428                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
429                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
430
431                 while ((skb = __skb_dequeue(&path->queue)))
432                         __skb_queue_tail(&skqueue, skb);
433
434                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
435                         if (neigh->ah) {
436                                 WARN_ON(neigh->ah != old_ah);
437                                 /*
438                                  * Dropping the ah reference inside
439                                  * priv->lock is safe here, because we
440                                  * will hold one more reference from
441                                  * the original value of path->ah (ie
442                                  * old_ah).
443                                  */
444                                 ipoib_put_ah(neigh->ah);
445                         }
446                         kref_get(&path->ah->ref);
447                         neigh->ah = path->ah;
448
449                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
450                                 if (!ipoib_cm_get(neigh))
451                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
452                                                                                path,
453                                                                                neigh));
454                                 if (!ipoib_cm_get(neigh)) {
455                                         list_del(&neigh->list);
456                                         ipoib_neigh_free(neigh);
457                                         continue;
458                                 }
459                         }
460
461                         while ((skb = __skb_dequeue(&neigh->queue)))
462                                 __skb_queue_tail(&skqueue, skb);
463                 }
464                 path->valid = 1;
465         }
466
467         path->query = NULL;
468         complete(&path->done);
469
470         spin_unlock_irqrestore(&priv->lock, flags);
471
472         if (old_ah)
473                 ipoib_put_ah(old_ah);
474
475         while ((skb = __skb_dequeue(&skqueue))) {
476                 skb->dev = dev;
477                 if (dev_queue_xmit(skb))
478                         ipoib_warn(priv, "dev_queue_xmit failed "
479                                    "to requeue packet\n");
480         }
481 }
482
483 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
484 {
485         struct ipoib_dev_priv *priv = netdev_priv(dev);
486         struct ipoib_path *path;
487
488         if (!priv->broadcast)
489                 return NULL;
490
491         path = kzalloc(sizeof *path, GFP_ATOMIC);
492         if (!path)
493                 return NULL;
494
495         path->dev = dev;
496
497         skb_queue_head_init(&path->queue);
498
499         INIT_LIST_HEAD(&path->neigh_list);
500
501         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
502         path->pathrec.sgid          = priv->local_gid;
503         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
504         path->pathrec.numb_path     = 1;
505         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
506
507         return path;
508 }
509
510 static int path_rec_start(struct net_device *dev,
511                           struct ipoib_path *path)
512 {
513         struct ipoib_dev_priv *priv = netdev_priv(dev);
514
515         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
516                   path->pathrec.dgid.raw);
517
518         init_completion(&path->done);
519
520         path->query_id =
521                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
522                                    &path->pathrec,
523                                    IB_SA_PATH_REC_DGID          |
524                                    IB_SA_PATH_REC_SGID          |
525                                    IB_SA_PATH_REC_NUMB_PATH     |
526                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
527                                    IB_SA_PATH_REC_PKEY,
528                                    1000, GFP_ATOMIC,
529                                    path_rec_completion,
530                                    path, &path->query);
531         if (path->query_id < 0) {
532                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
533                 path->query = NULL;
534                 complete(&path->done);
535                 return path->query_id;
536         }
537
538         return 0;
539 }
540
541 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
542                            struct net_device *dev)
543 {
544         struct ipoib_dev_priv *priv = netdev_priv(dev);
545         struct ipoib_path *path;
546         struct ipoib_neigh *neigh;
547         unsigned long flags;
548
549         neigh = ipoib_neigh_alloc(daddr, dev);
550         if (!neigh) {
551                 ++dev->stats.tx_dropped;
552                 dev_kfree_skb_any(skb);
553                 return;
554         }
555
556         spin_lock_irqsave(&priv->lock, flags);
557
558         path = __path_find(dev, daddr + 4);
559         if (!path) {
560                 path = path_rec_create(dev, daddr + 4);
561                 if (!path)
562                         goto err_path;
563
564                 __path_add(dev, path);
565         }
566
567         list_add_tail(&neigh->list, &path->neigh_list);
568
569         if (path->ah) {
570                 kref_get(&path->ah->ref);
571                 neigh->ah = path->ah;
572
573                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
574                         if (!ipoib_cm_get(neigh))
575                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
576                         if (!ipoib_cm_get(neigh)) {
577                                 list_del(&neigh->list);
578                                 ipoib_neigh_free(neigh);
579                                 goto err_drop;
580                         }
581                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
582                                 __skb_queue_tail(&neigh->queue, skb);
583                         else {
584                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
585                                            skb_queue_len(&neigh->queue));
586                                 goto err_drop;
587                         }
588                 } else {
589                         spin_unlock_irqrestore(&priv->lock, flags);
590                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
591                         ipoib_neigh_put(neigh);
592                         return;
593                 }
594         } else {
595                 neigh->ah  = NULL;
596
597                 if (!path->query && path_rec_start(dev, path))
598                         goto err_list;
599
600                 __skb_queue_tail(&neigh->queue, skb);
601         }
602
603         spin_unlock_irqrestore(&priv->lock, flags);
604         ipoib_neigh_put(neigh);
605         return;
606
607 err_list:
608         list_del(&neigh->list);
609
610 err_path:
611         ipoib_neigh_free(neigh);
612 err_drop:
613         ++dev->stats.tx_dropped;
614         dev_kfree_skb_any(skb);
615
616         spin_unlock_irqrestore(&priv->lock, flags);
617         ipoib_neigh_put(neigh);
618 }
619
620 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
621                              struct ipoib_cb *cb)
622 {
623         struct ipoib_dev_priv *priv = netdev_priv(dev);
624         struct ipoib_path *path;
625         unsigned long flags;
626
627         spin_lock_irqsave(&priv->lock, flags);
628
629         path = __path_find(dev, cb->hwaddr + 4);
630         if (!path || !path->valid) {
631                 int new_path = 0;
632
633                 if (!path) {
634                         path = path_rec_create(dev, cb->hwaddr + 4);
635                         new_path = 1;
636                 }
637                 if (path) {
638                         __skb_queue_tail(&path->queue, skb);
639
640                         if (!path->query && path_rec_start(dev, path)) {
641                                 spin_unlock_irqrestore(&priv->lock, flags);
642                                 if (new_path)
643                                         path_free(dev, path);
644                                 return;
645                         } else
646                                 __path_add(dev, path);
647                 } else {
648                         ++dev->stats.tx_dropped;
649                         dev_kfree_skb_any(skb);
650                 }
651
652                 spin_unlock_irqrestore(&priv->lock, flags);
653                 return;
654         }
655
656         if (path->ah) {
657                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
658                           be16_to_cpu(path->pathrec.dlid));
659
660                 spin_unlock_irqrestore(&priv->lock, flags);
661                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
662                 return;
663         } else if ((path->query || !path_rec_start(dev, path)) &&
664                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
665                 __skb_queue_tail(&path->queue, skb);
666         } else {
667                 ++dev->stats.tx_dropped;
668                 dev_kfree_skb_any(skb);
669         }
670
671         spin_unlock_irqrestore(&priv->lock, flags);
672 }
673
674 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
675 {
676         struct ipoib_dev_priv *priv = netdev_priv(dev);
677         struct ipoib_neigh *neigh;
678         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
679         struct ipoib_header *header;
680         unsigned long flags;
681
682         header = (struct ipoib_header *) skb->data;
683
684         if (unlikely(cb->hwaddr[4] == 0xff)) {
685                 /* multicast, arrange "if" according to probability */
686                 if ((header->proto != htons(ETH_P_IP)) &&
687                     (header->proto != htons(ETH_P_IPV6)) &&
688                     (header->proto != htons(ETH_P_ARP)) &&
689                     (header->proto != htons(ETH_P_RARP))) {
690                         /* ethertype not supported by IPoIB */
691                         ++dev->stats.tx_dropped;
692                         dev_kfree_skb_any(skb);
693                         return NETDEV_TX_OK;
694                 }
695                 /* Add in the P_Key for multicast*/
696                 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
697                 cb->hwaddr[9] = priv->pkey & 0xff;
698
699                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
700                 if (likely(neigh))
701                         goto send_using_neigh;
702                 ipoib_mcast_send(dev, cb->hwaddr, skb);
703                 return NETDEV_TX_OK;
704         }
705
706         /* unicast, arrange "switch" according to probability */
707         switch (header->proto) {
708         case htons(ETH_P_IP):
709         case htons(ETH_P_IPV6):
710                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
711                 if (unlikely(!neigh)) {
712                         neigh_add_path(skb, cb->hwaddr, dev);
713                         return NETDEV_TX_OK;
714                 }
715                 break;
716         case htons(ETH_P_ARP):
717         case htons(ETH_P_RARP):
718                 /* for unicast ARP and RARP should always perform path find */
719                 unicast_arp_send(skb, dev, cb);
720                 return NETDEV_TX_OK;
721         default:
722                 /* ethertype not supported by IPoIB */
723                 ++dev->stats.tx_dropped;
724                 dev_kfree_skb_any(skb);
725                 return NETDEV_TX_OK;
726         }
727
728 send_using_neigh:
729         /* note we now hold a ref to neigh */
730         if (ipoib_cm_get(neigh)) {
731                 if (ipoib_cm_up(neigh)) {
732                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
733                         goto unref;
734                 }
735         } else if (neigh->ah) {
736                 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
737                 goto unref;
738         }
739
740         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
741                 spin_lock_irqsave(&priv->lock, flags);
742                 __skb_queue_tail(&neigh->queue, skb);
743                 spin_unlock_irqrestore(&priv->lock, flags);
744         } else {
745                 ++dev->stats.tx_dropped;
746                 dev_kfree_skb_any(skb);
747         }
748
749 unref:
750         ipoib_neigh_put(neigh);
751
752         return NETDEV_TX_OK;
753 }
754
755 static void ipoib_timeout(struct net_device *dev)
756 {
757         struct ipoib_dev_priv *priv = netdev_priv(dev);
758
759         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
760                    jiffies_to_msecs(jiffies - dev->trans_start));
761         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
762                    netif_queue_stopped(dev),
763                    priv->tx_head, priv->tx_tail);
764         /* XXX reset QP, etc. */
765 }
766
767 static int ipoib_hard_header(struct sk_buff *skb,
768                              struct net_device *dev,
769                              unsigned short type,
770                              const void *daddr, const void *saddr, unsigned len)
771 {
772         struct ipoib_header *header;
773         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
774
775         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
776
777         header->proto = htons(type);
778         header->reserved = 0;
779
780         /*
781          * we don't rely on dst_entry structure,  always stuff the
782          * destination address into skb->cb so we can figure out where
783          * to send the packet later.
784          */
785         memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
786
787         return 0;
788 }
789
790 static void ipoib_set_mcast_list(struct net_device *dev)
791 {
792         struct ipoib_dev_priv *priv = netdev_priv(dev);
793
794         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
795                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
796                 return;
797         }
798
799         queue_work(ipoib_workqueue, &priv->restart_task);
800 }
801
802 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
803 {
804         /*
805          * Use only the address parts that contributes to spreading
806          * The subnet prefix is not used as one can not connect to
807          * same remote port (GUID) using the same remote QPN via two
808          * different subnets.
809          */
810          /* qpn octets[1:4) & port GUID octets[12:20) */
811         u32 *daddr_32 = (u32 *) daddr;
812         u32 hv;
813
814         hv = jhash_3words(daddr_32[3], daddr_32[4], 0xFFFFFF & daddr_32[0], 0);
815         return hv & htbl->mask;
816 }
817
818 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
819 {
820         struct ipoib_dev_priv *priv = netdev_priv(dev);
821         struct ipoib_neigh_table *ntbl = &priv->ntbl;
822         struct ipoib_neigh_hash *htbl;
823         struct ipoib_neigh *neigh = NULL;
824         u32 hash_val;
825
826         rcu_read_lock_bh();
827
828         htbl = rcu_dereference_bh(ntbl->htbl);
829
830         if (!htbl)
831                 goto out_unlock;
832
833         hash_val = ipoib_addr_hash(htbl, daddr);
834         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
835              neigh != NULL;
836              neigh = rcu_dereference_bh(neigh->hnext)) {
837                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
838                         /* found, take one ref on behalf of the caller */
839                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
840                                 /* deleted */
841                                 neigh = NULL;
842                                 goto out_unlock;
843                         }
844                         neigh->alive = jiffies;
845                         goto out_unlock;
846                 }
847         }
848
849 out_unlock:
850         rcu_read_unlock_bh();
851         return neigh;
852 }
853
854 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
855 {
856         struct ipoib_neigh_table *ntbl = &priv->ntbl;
857         struct ipoib_neigh_hash *htbl;
858         unsigned long neigh_obsolete;
859         unsigned long dt;
860         unsigned long flags;
861         int i;
862
863         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
864                 return;
865
866         write_lock_bh(&ntbl->rwlock);
867
868         htbl = rcu_dereference_protected(ntbl->htbl,
869                                          lockdep_is_held(&ntbl->rwlock));
870
871         if (!htbl)
872                 goto out_unlock;
873
874         /* neigh is obsolete if it was idle for two GC periods */
875         dt = 2 * arp_tbl.gc_interval;
876         neigh_obsolete = jiffies - dt;
877         /* handle possible race condition */
878         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
879                 goto out_unlock;
880
881         for (i = 0; i < htbl->size; i++) {
882                 struct ipoib_neigh *neigh;
883                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
884
885                 while ((neigh = rcu_dereference_protected(*np,
886                                                           lockdep_is_held(&ntbl->rwlock))) != NULL) {
887                         /* was the neigh idle for two GC periods */
888                         if (time_after(neigh_obsolete, neigh->alive)) {
889                                 rcu_assign_pointer(*np,
890                                                    rcu_dereference_protected(neigh->hnext,
891                                                                              lockdep_is_held(&ntbl->rwlock)));
892                                 /* remove from path/mc list */
893                                 spin_lock_irqsave(&priv->lock, flags);
894                                 list_del(&neigh->list);
895                                 spin_unlock_irqrestore(&priv->lock, flags);
896                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
897                         } else {
898                                 np = &neigh->hnext;
899                         }
900
901                 }
902         }
903
904 out_unlock:
905         write_unlock_bh(&ntbl->rwlock);
906 }
907
908 static void ipoib_reap_neigh(struct work_struct *work)
909 {
910         struct ipoib_dev_priv *priv =
911                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
912
913         __ipoib_reap_neigh(priv);
914
915         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
916                 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
917                                    arp_tbl.gc_interval);
918 }
919
920
921 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
922                                       struct net_device *dev)
923 {
924         struct ipoib_neigh *neigh;
925
926         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
927         if (!neigh)
928                 return NULL;
929
930         neigh->dev = dev;
931         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
932         skb_queue_head_init(&neigh->queue);
933         INIT_LIST_HEAD(&neigh->list);
934         ipoib_cm_set(neigh, NULL);
935         /* one ref on behalf of the caller */
936         atomic_set(&neigh->refcnt, 1);
937
938         return neigh;
939 }
940
941 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
942                                       struct net_device *dev)
943 {
944         struct ipoib_dev_priv *priv = netdev_priv(dev);
945         struct ipoib_neigh_table *ntbl = &priv->ntbl;
946         struct ipoib_neigh_hash *htbl;
947         struct ipoib_neigh *neigh;
948         u32 hash_val;
949
950         write_lock_bh(&ntbl->rwlock);
951
952         htbl = rcu_dereference_protected(ntbl->htbl,
953                                          lockdep_is_held(&ntbl->rwlock));
954         if (!htbl) {
955                 neigh = NULL;
956                 goto out_unlock;
957         }
958
959         /* need to add a new neigh, but maybe some other thread succeeded?
960          * recalc hash, maybe hash resize took place so we do a search
961          */
962         hash_val = ipoib_addr_hash(htbl, daddr);
963         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
964                                                lockdep_is_held(&ntbl->rwlock));
965              neigh != NULL;
966              neigh = rcu_dereference_protected(neigh->hnext,
967                                                lockdep_is_held(&ntbl->rwlock))) {
968                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
969                         /* found, take one ref on behalf of the caller */
970                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
971                                 /* deleted */
972                                 neigh = NULL;
973                                 break;
974                         }
975                         neigh->alive = jiffies;
976                         goto out_unlock;
977                 }
978         }
979
980         neigh = ipoib_neigh_ctor(daddr, dev);
981         if (!neigh)
982                 goto out_unlock;
983
984         /* one ref on behalf of the hash table */
985         atomic_inc(&neigh->refcnt);
986         neigh->alive = jiffies;
987         /* put in hash */
988         rcu_assign_pointer(neigh->hnext,
989                            rcu_dereference_protected(htbl->buckets[hash_val],
990                                                      lockdep_is_held(&ntbl->rwlock)));
991         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
992         atomic_inc(&ntbl->entries);
993
994 out_unlock:
995         write_unlock_bh(&ntbl->rwlock);
996
997         return neigh;
998 }
999
1000 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1001 {
1002         /* neigh reference count was dropprd to zero */
1003         struct net_device *dev = neigh->dev;
1004         struct ipoib_dev_priv *priv = netdev_priv(dev);
1005         struct sk_buff *skb;
1006         if (neigh->ah)
1007                 ipoib_put_ah(neigh->ah);
1008         while ((skb = __skb_dequeue(&neigh->queue))) {
1009                 ++dev->stats.tx_dropped;
1010                 dev_kfree_skb_any(skb);
1011         }
1012         if (ipoib_cm_get(neigh))
1013                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1014         ipoib_dbg(netdev_priv(dev),
1015                   "neigh free for %06x %pI6\n",
1016                   IPOIB_QPN(neigh->daddr),
1017                   neigh->daddr + 4);
1018         kfree(neigh);
1019         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1020                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1021                         complete(&priv->ntbl.flushed);
1022         }
1023 }
1024
1025 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1026 {
1027         /* Called as a result of removal from hash table */
1028         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1029         /* note TX context may hold another ref */
1030         ipoib_neigh_put(neigh);
1031 }
1032
1033 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1034 {
1035         struct net_device *dev = neigh->dev;
1036         struct ipoib_dev_priv *priv = netdev_priv(dev);
1037         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1038         struct ipoib_neigh_hash *htbl;
1039         struct ipoib_neigh __rcu **np;
1040         struct ipoib_neigh *n;
1041         u32 hash_val;
1042
1043         write_lock_bh(&ntbl->rwlock);
1044
1045         htbl = rcu_dereference_protected(ntbl->htbl,
1046                                         lockdep_is_held(&ntbl->rwlock));
1047         if (!htbl)
1048                 goto out_unlock;
1049
1050         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1051         np = &htbl->buckets[hash_val];
1052         for (n = rcu_dereference_protected(*np,
1053                                             lockdep_is_held(&ntbl->rwlock));
1054              n != NULL;
1055              n = rcu_dereference_protected(*np,
1056                                         lockdep_is_held(&ntbl->rwlock))) {
1057                 if (n == neigh) {
1058                         /* found */
1059                         rcu_assign_pointer(*np,
1060                                            rcu_dereference_protected(neigh->hnext,
1061                                                                      lockdep_is_held(&ntbl->rwlock)));
1062                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1063                         goto out_unlock;
1064                 } else {
1065                         np = &n->hnext;
1066                 }
1067         }
1068
1069 out_unlock:
1070         write_unlock_bh(&ntbl->rwlock);
1071
1072 }
1073
1074 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1075 {
1076         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1077         struct ipoib_neigh_hash *htbl;
1078         struct ipoib_neigh **buckets;
1079         u32 size;
1080
1081         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1082         ntbl->htbl = NULL;
1083         rwlock_init(&ntbl->rwlock);
1084         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1085         if (!htbl)
1086                 return -ENOMEM;
1087         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1088         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1089         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1090         if (!buckets) {
1091                 kfree(htbl);
1092                 return -ENOMEM;
1093         }
1094         htbl->size = size;
1095         htbl->mask = (size - 1);
1096         htbl->buckets = buckets;
1097         ntbl->htbl = htbl;
1098         atomic_set(&ntbl->entries, 0);
1099
1100         /* start garbage collection */
1101         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1102         queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
1103                            arp_tbl.gc_interval);
1104
1105         return 0;
1106 }
1107
1108 static void neigh_hash_free_rcu(struct rcu_head *head)
1109 {
1110         struct ipoib_neigh_hash *htbl = container_of(head,
1111                                                     struct ipoib_neigh_hash,
1112                                                     rcu);
1113         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1114
1115         kfree(buckets);
1116         kfree(htbl);
1117 }
1118
1119 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1120 {
1121         struct ipoib_dev_priv *priv = netdev_priv(dev);
1122         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1123         struct ipoib_neigh_hash *htbl;
1124         unsigned long flags;
1125         int i;
1126
1127         /* remove all neigh connected to a given path or mcast */
1128         write_lock_bh(&ntbl->rwlock);
1129
1130         htbl = rcu_dereference_protected(ntbl->htbl,
1131                                          lockdep_is_held(&ntbl->rwlock));
1132
1133         if (!htbl)
1134                 goto out_unlock;
1135
1136         for (i = 0; i < htbl->size; i++) {
1137                 struct ipoib_neigh *neigh;
1138                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1139
1140                 while ((neigh = rcu_dereference_protected(*np,
1141                                                           lockdep_is_held(&ntbl->rwlock))) != NULL) {
1142                         /* delete neighs belong to this parent */
1143                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1144                                 rcu_assign_pointer(*np,
1145                                                    rcu_dereference_protected(neigh->hnext,
1146                                                                              lockdep_is_held(&ntbl->rwlock)));
1147                                 /* remove from parent list */
1148                                 spin_lock_irqsave(&priv->lock, flags);
1149                                 list_del(&neigh->list);
1150                                 spin_unlock_irqrestore(&priv->lock, flags);
1151                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1152                         } else {
1153                                 np = &neigh->hnext;
1154                         }
1155
1156                 }
1157         }
1158 out_unlock:
1159         write_unlock_bh(&ntbl->rwlock);
1160 }
1161
1162 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1163 {
1164         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1165         struct ipoib_neigh_hash *htbl;
1166         unsigned long flags;
1167         int i;
1168
1169         write_lock_bh(&ntbl->rwlock);
1170
1171         htbl = rcu_dereference_protected(ntbl->htbl,
1172                                         lockdep_is_held(&ntbl->rwlock));
1173         if (!htbl)
1174                 goto out_unlock;
1175
1176         for (i = 0; i < htbl->size; i++) {
1177                 struct ipoib_neigh *neigh;
1178                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1179
1180                 while ((neigh = rcu_dereference_protected(*np,
1181                                                           lockdep_is_held(&ntbl->rwlock))) != NULL) {
1182                         rcu_assign_pointer(*np,
1183                                            rcu_dereference_protected(neigh->hnext,
1184                                                                      lockdep_is_held(&ntbl->rwlock)));
1185                         /* remove from path/mc list */
1186                         spin_lock_irqsave(&priv->lock, flags);
1187                         list_del(&neigh->list);
1188                         spin_unlock_irqrestore(&priv->lock, flags);
1189                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1190                 }
1191         }
1192
1193         rcu_assign_pointer(ntbl->htbl, NULL);
1194         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1195
1196 out_unlock:
1197         write_unlock_bh(&ntbl->rwlock);
1198 }
1199
1200 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1201 {
1202         struct ipoib_dev_priv *priv = netdev_priv(dev);
1203         int stopped;
1204
1205         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1206         init_completion(&priv->ntbl.flushed);
1207         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1208
1209         /* Stop GC if called at init fail need to cancel work */
1210         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1211         if (!stopped)
1212                 cancel_delayed_work(&priv->neigh_reap_task);
1213
1214         if (atomic_read(&priv->ntbl.entries)) {
1215                 ipoib_flush_neighs(priv);
1216                 wait_for_completion(&priv->ntbl.flushed);
1217         }
1218 }
1219
1220
1221 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1222 {
1223         struct ipoib_dev_priv *priv = netdev_priv(dev);
1224
1225         if (ipoib_neigh_hash_init(priv) < 0)
1226                 goto out;
1227         /* Allocate RX/TX "rings" to hold queued skbs */
1228         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1229                                 GFP_KERNEL);
1230         if (!priv->rx_ring) {
1231                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1232                        ca->name, ipoib_recvq_size);
1233                 goto out_neigh_hash_cleanup;
1234         }
1235
1236         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1237         if (!priv->tx_ring) {
1238                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1239                        ca->name, ipoib_sendq_size);
1240                 goto out_rx_ring_cleanup;
1241         }
1242
1243         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1244
1245         if (ipoib_ib_dev_init(dev, ca, port))
1246                 goto out_tx_ring_cleanup;
1247
1248         return 0;
1249
1250 out_tx_ring_cleanup:
1251         vfree(priv->tx_ring);
1252
1253 out_rx_ring_cleanup:
1254         kfree(priv->rx_ring);
1255
1256 out_neigh_hash_cleanup:
1257         ipoib_neigh_hash_uninit(dev);
1258 out:
1259         return -ENOMEM;
1260 }
1261
1262 void ipoib_dev_cleanup(struct net_device *dev)
1263 {
1264         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1265
1266         ipoib_delete_debug_files(dev);
1267
1268         /* Delete any child interfaces first */
1269         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1270                 /* Stop GC on child */
1271                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1272                 cancel_delayed_work(&cpriv->neigh_reap_task);
1273                 unregister_netdev(cpriv->dev);
1274                 ipoib_dev_cleanup(cpriv->dev);
1275                 free_netdev(cpriv->dev);
1276         }
1277
1278         ipoib_ib_dev_cleanup(dev);
1279
1280         kfree(priv->rx_ring);
1281         vfree(priv->tx_ring);
1282
1283         priv->rx_ring = NULL;
1284         priv->tx_ring = NULL;
1285
1286         ipoib_neigh_hash_uninit(dev);
1287 }
1288
1289 static const struct header_ops ipoib_header_ops = {
1290         .create = ipoib_hard_header,
1291 };
1292
1293 static const struct net_device_ops ipoib_netdev_ops = {
1294         .ndo_open                = ipoib_open,
1295         .ndo_stop                = ipoib_stop,
1296         .ndo_change_mtu          = ipoib_change_mtu,
1297         .ndo_fix_features        = ipoib_fix_features,
1298         .ndo_start_xmit          = ipoib_start_xmit,
1299         .ndo_tx_timeout          = ipoib_timeout,
1300         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1301 };
1302
1303 static void ipoib_setup(struct net_device *dev)
1304 {
1305         struct ipoib_dev_priv *priv = netdev_priv(dev);
1306
1307         dev->netdev_ops          = &ipoib_netdev_ops;
1308         dev->header_ops          = &ipoib_header_ops;
1309
1310         ipoib_set_ethtool_ops(dev);
1311
1312         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1313
1314         dev->watchdog_timeo      = HZ;
1315
1316         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1317
1318         dev->hard_header_len     = IPOIB_ENCAP_LEN;
1319         dev->addr_len            = INFINIBAND_ALEN;
1320         dev->type                = ARPHRD_INFINIBAND;
1321         dev->tx_queue_len        = ipoib_sendq_size * 2;
1322         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1323                                     NETIF_F_HIGHDMA);
1324         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
1325
1326         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1327
1328         netif_carrier_off(dev);
1329
1330         priv->dev = dev;
1331
1332         spin_lock_init(&priv->lock);
1333
1334         mutex_init(&priv->vlan_mutex);
1335
1336         INIT_LIST_HEAD(&priv->path_list);
1337         INIT_LIST_HEAD(&priv->child_intfs);
1338         INIT_LIST_HEAD(&priv->dead_ahs);
1339         INIT_LIST_HEAD(&priv->multicast_list);
1340
1341         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1342         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1343         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1344         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1345         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1346         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1347         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1348         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1349         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1350 }
1351
1352 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1353 {
1354         struct net_device *dev;
1355
1356         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1357                            ipoib_setup);
1358         if (!dev)
1359                 return NULL;
1360
1361         return netdev_priv(dev);
1362 }
1363
1364 static ssize_t show_pkey(struct device *dev,
1365                          struct device_attribute *attr, char *buf)
1366 {
1367         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1368
1369         return sprintf(buf, "0x%04x\n", priv->pkey);
1370 }
1371 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1372
1373 static ssize_t show_umcast(struct device *dev,
1374                            struct device_attribute *attr, char *buf)
1375 {
1376         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1377
1378         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1379 }
1380
1381 static ssize_t set_umcast(struct device *dev,
1382                           struct device_attribute *attr,
1383                           const char *buf, size_t count)
1384 {
1385         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1386         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1387
1388         if (umcast_val > 0) {
1389                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1390                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1391                                 "by userspace\n");
1392         } else
1393                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1394
1395         return count;
1396 }
1397 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1398
1399 int ipoib_add_umcast_attr(struct net_device *dev)
1400 {
1401         return device_create_file(&dev->dev, &dev_attr_umcast);
1402 }
1403
1404 static ssize_t create_child(struct device *dev,
1405                             struct device_attribute *attr,
1406                             const char *buf, size_t count)
1407 {
1408         int pkey;
1409         int ret;
1410
1411         if (sscanf(buf, "%i", &pkey) != 1)
1412                 return -EINVAL;
1413
1414         if (pkey < 0 || pkey > 0xffff)
1415                 return -EINVAL;
1416
1417         /*
1418          * Set the full membership bit, so that we join the right
1419          * broadcast group, etc.
1420          */
1421         pkey |= 0x8000;
1422
1423         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1424
1425         return ret ? ret : count;
1426 }
1427 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1428
1429 static ssize_t delete_child(struct device *dev,
1430                             struct device_attribute *attr,
1431                             const char *buf, size_t count)
1432 {
1433         int pkey;
1434         int ret;
1435
1436         if (sscanf(buf, "%i", &pkey) != 1)
1437                 return -EINVAL;
1438
1439         if (pkey < 0 || pkey > 0xffff)
1440                 return -EINVAL;
1441
1442         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1443
1444         return ret ? ret : count;
1445
1446 }
1447 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1448
1449 int ipoib_add_pkey_attr(struct net_device *dev)
1450 {
1451         return device_create_file(&dev->dev, &dev_attr_pkey);
1452 }
1453
1454 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1455 {
1456         struct ib_device_attr *device_attr;
1457         int result = -ENOMEM;
1458
1459         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1460         if (!device_attr) {
1461                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1462                        hca->name, sizeof *device_attr);
1463                 return result;
1464         }
1465
1466         result = ib_query_device(hca, device_attr);
1467         if (result) {
1468                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1469                        hca->name, result);
1470                 kfree(device_attr);
1471                 return result;
1472         }
1473         priv->hca_caps = device_attr->device_cap_flags;
1474
1475         kfree(device_attr);
1476
1477         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1478                 priv->dev->hw_features = NETIF_F_SG |
1479                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1480
1481                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1482                         priv->dev->hw_features |= NETIF_F_TSO;
1483
1484                 priv->dev->features |= priv->dev->hw_features;
1485         }
1486
1487         return 0;
1488 }
1489
1490 static struct net_device *ipoib_add_port(const char *format,
1491                                          struct ib_device *hca, u8 port)
1492 {
1493         struct ipoib_dev_priv *priv;
1494         struct ib_port_attr attr;
1495         int result = -ENOMEM;
1496
1497         priv = ipoib_intf_alloc(format);
1498         if (!priv)
1499                 goto alloc_mem_failed;
1500
1501         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1502         priv->dev->dev_id = port - 1;
1503
1504         if (!ib_query_port(hca, port, &attr))
1505                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1506         else {
1507                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1508                        hca->name, port);
1509                 goto device_init_failed;
1510         }
1511
1512         /* MTU will be reset when mcast join happens */
1513         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1514         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1515
1516         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1517
1518         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1519         if (result) {
1520                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1521                        hca->name, port, result);
1522                 goto device_init_failed;
1523         }
1524
1525         if (ipoib_set_dev_features(priv, hca))
1526                 goto device_init_failed;
1527
1528         /*
1529          * Set the full membership bit, so that we join the right
1530          * broadcast group, etc.
1531          */
1532         priv->pkey |= 0x8000;
1533
1534         priv->dev->broadcast[8] = priv->pkey >> 8;
1535         priv->dev->broadcast[9] = priv->pkey & 0xff;
1536
1537         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1538         if (result) {
1539                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1540                        hca->name, port, result);
1541                 goto device_init_failed;
1542         } else
1543                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1544
1545         result = ipoib_dev_init(priv->dev, hca, port);
1546         if (result < 0) {
1547                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1548                        hca->name, port, result);
1549                 goto device_init_failed;
1550         }
1551
1552         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1553                               priv->ca, ipoib_event);
1554         result = ib_register_event_handler(&priv->event_handler);
1555         if (result < 0) {
1556                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1557                        "port %d (ret = %d)\n",
1558                        hca->name, port, result);
1559                 goto event_failed;
1560         }
1561
1562         result = register_netdev(priv->dev);
1563         if (result) {
1564                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1565                        hca->name, port, result);
1566                 goto register_failed;
1567         }
1568
1569         ipoib_create_debug_files(priv->dev);
1570
1571         if (ipoib_cm_add_mode_attr(priv->dev))
1572                 goto sysfs_failed;
1573         if (ipoib_add_pkey_attr(priv->dev))
1574                 goto sysfs_failed;
1575         if (ipoib_add_umcast_attr(priv->dev))
1576                 goto sysfs_failed;
1577         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1578                 goto sysfs_failed;
1579         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1580                 goto sysfs_failed;
1581
1582         return priv->dev;
1583
1584 sysfs_failed:
1585         ipoib_delete_debug_files(priv->dev);
1586         unregister_netdev(priv->dev);
1587
1588 register_failed:
1589         ib_unregister_event_handler(&priv->event_handler);
1590         /* Stop GC if started before flush */
1591         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1592         cancel_delayed_work(&priv->neigh_reap_task);
1593         flush_workqueue(ipoib_workqueue);
1594
1595 event_failed:
1596         ipoib_dev_cleanup(priv->dev);
1597
1598 device_init_failed:
1599         free_netdev(priv->dev);
1600
1601 alloc_mem_failed:
1602         return ERR_PTR(result);
1603 }
1604
1605 static void ipoib_add_one(struct ib_device *device)
1606 {
1607         struct list_head *dev_list;
1608         struct net_device *dev;
1609         struct ipoib_dev_priv *priv;
1610         int s, e, p;
1611
1612         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1613                 return;
1614
1615         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1616         if (!dev_list)
1617                 return;
1618
1619         INIT_LIST_HEAD(dev_list);
1620
1621         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1622                 s = 0;
1623                 e = 0;
1624         } else {
1625                 s = 1;
1626                 e = device->phys_port_cnt;
1627         }
1628
1629         for (p = s; p <= e; ++p) {
1630                 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1631                         continue;
1632                 dev = ipoib_add_port("ib%d", device, p);
1633                 if (!IS_ERR(dev)) {
1634                         priv = netdev_priv(dev);
1635                         list_add_tail(&priv->list, dev_list);
1636                 }
1637         }
1638
1639         ib_set_client_data(device, &ipoib_client, dev_list);
1640 }
1641
1642 static void ipoib_remove_one(struct ib_device *device)
1643 {
1644         struct ipoib_dev_priv *priv, *tmp;
1645         struct list_head *dev_list;
1646
1647         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1648                 return;
1649
1650         dev_list = ib_get_client_data(device, &ipoib_client);
1651
1652         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1653                 ib_unregister_event_handler(&priv->event_handler);
1654
1655                 rtnl_lock();
1656                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1657                 rtnl_unlock();
1658
1659                 /* Stop GC */
1660                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1661                 cancel_delayed_work(&priv->neigh_reap_task);
1662                 flush_workqueue(ipoib_workqueue);
1663
1664                 unregister_netdev(priv->dev);
1665                 ipoib_dev_cleanup(priv->dev);
1666                 free_netdev(priv->dev);
1667         }
1668
1669         kfree(dev_list);
1670 }
1671
1672 static int __init ipoib_init_module(void)
1673 {
1674         int ret;
1675
1676         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1677         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1678         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1679
1680         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1681         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1682         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1683 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1684         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1685 #endif
1686
1687         /*
1688          * When copying small received packets, we only copy from the
1689          * linear data part of the SKB, so we rely on this condition.
1690          */
1691         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1692
1693         ret = ipoib_register_debugfs();
1694         if (ret)
1695                 return ret;
1696
1697         /*
1698          * We create our own workqueue mainly because we want to be
1699          * able to flush it when devices are being removed.  We can't
1700          * use schedule_work()/flush_scheduled_work() because both
1701          * unregister_netdev() and linkwatch_event take the rtnl lock,
1702          * so flush_scheduled_work() can deadlock during device
1703          * removal.
1704          */
1705         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1706         if (!ipoib_workqueue) {
1707                 ret = -ENOMEM;
1708                 goto err_fs;
1709         }
1710
1711         ib_sa_register_client(&ipoib_sa_client);
1712
1713         ret = ib_register_client(&ipoib_client);
1714         if (ret)
1715                 goto err_sa;
1716
1717         return 0;
1718
1719 err_sa:
1720         ib_sa_unregister_client(&ipoib_sa_client);
1721         destroy_workqueue(ipoib_workqueue);
1722
1723 err_fs:
1724         ipoib_unregister_debugfs();
1725
1726         return ret;
1727 }
1728
1729 static void __exit ipoib_cleanup_module(void)
1730 {
1731         ib_unregister_client(&ipoib_client);
1732         ib_sa_unregister_client(&ipoib_sa_client);
1733         ipoib_unregister_debugfs();
1734         destroy_workqueue(ipoib_workqueue);
1735 }
1736
1737 module_init(ipoib_init_module);
1738 module_exit(ipoib_cleanup_module);