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IPoIB: Fix ipoib_hard_header() return value
[karo-tx-linux.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 <linux/jhash.h>
50 #include <net/arp.h>
51
52 #define DRV_VERSION "1.0.0"
53
54 const char ipoib_driver_version[] = DRV_VERSION;
55
56 MODULE_AUTHOR("Roland Dreier");
57 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
58 MODULE_LICENSE("Dual BSD/GPL");
59 MODULE_VERSION(DRV_VERSION);
60
61 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
62 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
63
64 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
65 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
66 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
67 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
68
69 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
70 int ipoib_debug_level;
71
72 module_param_named(debug_level, ipoib_debug_level, int, 0644);
73 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
74 #endif
75
76 struct ipoib_path_iter {
77         struct net_device *dev;
78         struct ipoib_path  path;
79 };
80
81 static const u8 ipv4_bcast_addr[] = {
82         0x00, 0xff, 0xff, 0xff,
83         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
84         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
85 };
86
87 struct workqueue_struct *ipoib_workqueue;
88
89 struct ib_sa_client ipoib_sa_client;
90
91 static void ipoib_add_one(struct ib_device *device);
92 static void ipoib_remove_one(struct ib_device *device);
93 static void ipoib_neigh_reclaim(struct rcu_head *rp);
94
95 static struct ib_client ipoib_client = {
96         .name   = "ipoib",
97         .add    = ipoib_add_one,
98         .remove = ipoib_remove_one
99 };
100
101 int ipoib_open(struct net_device *dev)
102 {
103         struct ipoib_dev_priv *priv = netdev_priv(dev);
104
105         ipoib_dbg(priv, "bringing up interface\n");
106
107         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
108
109         if (ipoib_pkey_dev_delay_open(dev))
110                 return 0;
111
112         if (ipoib_ib_dev_open(dev))
113                 goto err_disable;
114
115         if (ipoib_ib_dev_up(dev))
116                 goto err_stop;
117
118         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
119                 struct ipoib_dev_priv *cpriv;
120
121                 /* Bring up any child interfaces too */
122                 mutex_lock(&priv->vlan_mutex);
123                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
124                         int flags;
125
126                         flags = cpriv->dev->flags;
127                         if (flags & IFF_UP)
128                                 continue;
129
130                         dev_change_flags(cpriv->dev, flags | IFF_UP);
131                 }
132                 mutex_unlock(&priv->vlan_mutex);
133         }
134
135         netif_start_queue(dev);
136
137         return 0;
138
139 err_stop:
140         ipoib_ib_dev_stop(dev, 1);
141
142 err_disable:
143         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
144
145         return -EINVAL;
146 }
147
148 static int ipoib_stop(struct net_device *dev)
149 {
150         struct ipoib_dev_priv *priv = netdev_priv(dev);
151
152         ipoib_dbg(priv, "stopping interface\n");
153
154         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
155
156         netif_stop_queue(dev);
157
158         ipoib_ib_dev_down(dev, 1);
159         ipoib_ib_dev_stop(dev, 0);
160
161         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
162                 struct ipoib_dev_priv *cpriv;
163
164                 /* Bring down any child interfaces too */
165                 mutex_lock(&priv->vlan_mutex);
166                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
167                         int flags;
168
169                         flags = cpriv->dev->flags;
170                         if (!(flags & IFF_UP))
171                                 continue;
172
173                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
174                 }
175                 mutex_unlock(&priv->vlan_mutex);
176         }
177
178         return 0;
179 }
180
181 static void ipoib_uninit(struct net_device *dev)
182 {
183         ipoib_dev_cleanup(dev);
184 }
185
186 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
187 {
188         struct ipoib_dev_priv *priv = netdev_priv(dev);
189
190         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
191                 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
192
193         return features;
194 }
195
196 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
197 {
198         struct ipoib_dev_priv *priv = netdev_priv(dev);
199
200         /* dev->mtu > 2K ==> connected mode */
201         if (ipoib_cm_admin_enabled(dev)) {
202                 if (new_mtu > ipoib_cm_max_mtu(dev))
203                         return -EINVAL;
204
205                 if (new_mtu > priv->mcast_mtu)
206                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
207                                    priv->mcast_mtu);
208
209                 dev->mtu = new_mtu;
210                 return 0;
211         }
212
213         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
214                 return -EINVAL;
215
216         priv->admin_mtu = new_mtu;
217
218         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
219
220         return 0;
221 }
222
223 int ipoib_set_mode(struct net_device *dev, const char *buf)
224 {
225         struct ipoib_dev_priv *priv = netdev_priv(dev);
226
227         /* flush paths if we switch modes so that connections are restarted */
228         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
229                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
230                 ipoib_warn(priv, "enabling connected mode "
231                            "will cause multicast packet drops\n");
232                 netdev_update_features(dev);
233                 rtnl_unlock();
234                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
235
236                 ipoib_flush_paths(dev);
237                 rtnl_lock();
238                 return 0;
239         }
240
241         if (!strcmp(buf, "datagram\n")) {
242                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
243                 netdev_update_features(dev);
244                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
245                 rtnl_unlock();
246                 ipoib_flush_paths(dev);
247                 rtnl_lock();
248                 return 0;
249         }
250
251         return -EINVAL;
252 }
253
254 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
255 {
256         struct ipoib_dev_priv *priv = netdev_priv(dev);
257         struct rb_node *n = priv->path_tree.rb_node;
258         struct ipoib_path *path;
259         int ret;
260
261         while (n) {
262                 path = rb_entry(n, struct ipoib_path, rb_node);
263
264                 ret = memcmp(gid, path->pathrec.dgid.raw,
265                              sizeof (union ib_gid));
266
267                 if (ret < 0)
268                         n = n->rb_left;
269                 else if (ret > 0)
270                         n = n->rb_right;
271                 else
272                         return path;
273         }
274
275         return NULL;
276 }
277
278 static int __path_add(struct net_device *dev, struct ipoib_path *path)
279 {
280         struct ipoib_dev_priv *priv = netdev_priv(dev);
281         struct rb_node **n = &priv->path_tree.rb_node;
282         struct rb_node *pn = NULL;
283         struct ipoib_path *tpath;
284         int ret;
285
286         while (*n) {
287                 pn = *n;
288                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
289
290                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
291                              sizeof (union ib_gid));
292                 if (ret < 0)
293                         n = &pn->rb_left;
294                 else if (ret > 0)
295                         n = &pn->rb_right;
296                 else
297                         return -EEXIST;
298         }
299
300         rb_link_node(&path->rb_node, pn, n);
301         rb_insert_color(&path->rb_node, &priv->path_tree);
302
303         list_add_tail(&path->list, &priv->path_list);
304
305         return 0;
306 }
307
308 static void path_free(struct net_device *dev, struct ipoib_path *path)
309 {
310         struct sk_buff *skb;
311
312         while ((skb = __skb_dequeue(&path->queue)))
313                 dev_kfree_skb_irq(skb);
314
315         ipoib_dbg(netdev_priv(dev), "path_free\n");
316
317         /* remove all neigh connected to this path */
318         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
319
320         if (path->ah)
321                 ipoib_put_ah(path->ah);
322
323         kfree(path);
324 }
325
326 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
327
328 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
329 {
330         struct ipoib_path_iter *iter;
331
332         iter = kmalloc(sizeof *iter, GFP_KERNEL);
333         if (!iter)
334                 return NULL;
335
336         iter->dev = dev;
337         memset(iter->path.pathrec.dgid.raw, 0, 16);
338
339         if (ipoib_path_iter_next(iter)) {
340                 kfree(iter);
341                 return NULL;
342         }
343
344         return iter;
345 }
346
347 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
348 {
349         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
350         struct rb_node *n;
351         struct ipoib_path *path;
352         int ret = 1;
353
354         spin_lock_irq(&priv->lock);
355
356         n = rb_first(&priv->path_tree);
357
358         while (n) {
359                 path = rb_entry(n, struct ipoib_path, rb_node);
360
361                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
362                            sizeof (union ib_gid)) < 0) {
363                         iter->path = *path;
364                         ret = 0;
365                         break;
366                 }
367
368                 n = rb_next(n);
369         }
370
371         spin_unlock_irq(&priv->lock);
372
373         return ret;
374 }
375
376 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
377                           struct ipoib_path *path)
378 {
379         *path = iter->path;
380 }
381
382 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
383
384 void ipoib_mark_paths_invalid(struct net_device *dev)
385 {
386         struct ipoib_dev_priv *priv = netdev_priv(dev);
387         struct ipoib_path *path, *tp;
388
389         spin_lock_irq(&priv->lock);
390
391         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
392                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
393                         be16_to_cpu(path->pathrec.dlid),
394                         path->pathrec.dgid.raw);
395                 path->valid =  0;
396         }
397
398         spin_unlock_irq(&priv->lock);
399 }
400
401 void ipoib_flush_paths(struct net_device *dev)
402 {
403         struct ipoib_dev_priv *priv = netdev_priv(dev);
404         struct ipoib_path *path, *tp;
405         LIST_HEAD(remove_list);
406         unsigned long flags;
407
408         netif_tx_lock_bh(dev);
409         spin_lock_irqsave(&priv->lock, flags);
410
411         list_splice_init(&priv->path_list, &remove_list);
412
413         list_for_each_entry(path, &remove_list, list)
414                 rb_erase(&path->rb_node, &priv->path_tree);
415
416         list_for_each_entry_safe(path, tp, &remove_list, list) {
417                 if (path->query)
418                         ib_sa_cancel_query(path->query_id, path->query);
419                 spin_unlock_irqrestore(&priv->lock, flags);
420                 netif_tx_unlock_bh(dev);
421                 wait_for_completion(&path->done);
422                 path_free(dev, path);
423                 netif_tx_lock_bh(dev);
424                 spin_lock_irqsave(&priv->lock, flags);
425         }
426
427         spin_unlock_irqrestore(&priv->lock, flags);
428         netif_tx_unlock_bh(dev);
429 }
430
431 static void path_rec_completion(int status,
432                                 struct ib_sa_path_rec *pathrec,
433                                 void *path_ptr)
434 {
435         struct ipoib_path *path = path_ptr;
436         struct net_device *dev = path->dev;
437         struct ipoib_dev_priv *priv = netdev_priv(dev);
438         struct ipoib_ah *ah = NULL;
439         struct ipoib_ah *old_ah = NULL;
440         struct ipoib_neigh *neigh, *tn;
441         struct sk_buff_head skqueue;
442         struct sk_buff *skb;
443         unsigned long flags;
444
445         if (!status)
446                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
447                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
448         else
449                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
450                           status, path->pathrec.dgid.raw);
451
452         skb_queue_head_init(&skqueue);
453
454         if (!status) {
455                 struct ib_ah_attr av;
456
457                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
458                         ah = ipoib_create_ah(dev, priv->pd, &av);
459         }
460
461         spin_lock_irqsave(&priv->lock, flags);
462
463         if (!IS_ERR_OR_NULL(ah)) {
464                 path->pathrec = *pathrec;
465
466                 old_ah   = path->ah;
467                 path->ah = ah;
468
469                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
470                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
471
472                 while ((skb = __skb_dequeue(&path->queue)))
473                         __skb_queue_tail(&skqueue, skb);
474
475                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
476                         if (neigh->ah) {
477                                 WARN_ON(neigh->ah != old_ah);
478                                 /*
479                                  * Dropping the ah reference inside
480                                  * priv->lock is safe here, because we
481                                  * will hold one more reference from
482                                  * the original value of path->ah (ie
483                                  * old_ah).
484                                  */
485                                 ipoib_put_ah(neigh->ah);
486                         }
487                         kref_get(&path->ah->ref);
488                         neigh->ah = path->ah;
489
490                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
491                                 if (!ipoib_cm_get(neigh))
492                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
493                                                                                path,
494                                                                                neigh));
495                                 if (!ipoib_cm_get(neigh)) {
496                                         list_del(&neigh->list);
497                                         ipoib_neigh_free(neigh);
498                                         continue;
499                                 }
500                         }
501
502                         while ((skb = __skb_dequeue(&neigh->queue)))
503                                 __skb_queue_tail(&skqueue, skb);
504                 }
505                 path->valid = 1;
506         }
507
508         path->query = NULL;
509         complete(&path->done);
510
511         spin_unlock_irqrestore(&priv->lock, flags);
512
513         if (IS_ERR_OR_NULL(ah))
514                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
515
516         if (old_ah)
517                 ipoib_put_ah(old_ah);
518
519         while ((skb = __skb_dequeue(&skqueue))) {
520                 skb->dev = dev;
521                 if (dev_queue_xmit(skb))
522                         ipoib_warn(priv, "dev_queue_xmit failed "
523                                    "to requeue packet\n");
524         }
525 }
526
527 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
528 {
529         struct ipoib_dev_priv *priv = netdev_priv(dev);
530         struct ipoib_path *path;
531
532         if (!priv->broadcast)
533                 return NULL;
534
535         path = kzalloc(sizeof *path, GFP_ATOMIC);
536         if (!path)
537                 return NULL;
538
539         path->dev = dev;
540
541         skb_queue_head_init(&path->queue);
542
543         INIT_LIST_HEAD(&path->neigh_list);
544
545         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
546         path->pathrec.sgid          = priv->local_gid;
547         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
548         path->pathrec.numb_path     = 1;
549         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
550
551         return path;
552 }
553
554 static int path_rec_start(struct net_device *dev,
555                           struct ipoib_path *path)
556 {
557         struct ipoib_dev_priv *priv = netdev_priv(dev);
558
559         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
560                   path->pathrec.dgid.raw);
561
562         init_completion(&path->done);
563
564         path->query_id =
565                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
566                                    &path->pathrec,
567                                    IB_SA_PATH_REC_DGID          |
568                                    IB_SA_PATH_REC_SGID          |
569                                    IB_SA_PATH_REC_NUMB_PATH     |
570                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
571                                    IB_SA_PATH_REC_PKEY,
572                                    1000, GFP_ATOMIC,
573                                    path_rec_completion,
574                                    path, &path->query);
575         if (path->query_id < 0) {
576                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
577                 path->query = NULL;
578                 complete(&path->done);
579                 return path->query_id;
580         }
581
582         return 0;
583 }
584
585 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
586                            struct net_device *dev)
587 {
588         struct ipoib_dev_priv *priv = netdev_priv(dev);
589         struct ipoib_path *path;
590         struct ipoib_neigh *neigh;
591         unsigned long flags;
592
593         spin_lock_irqsave(&priv->lock, flags);
594         neigh = ipoib_neigh_alloc(daddr, dev);
595         if (!neigh) {
596                 spin_unlock_irqrestore(&priv->lock, flags);
597                 ++dev->stats.tx_dropped;
598                 dev_kfree_skb_any(skb);
599                 return;
600         }
601
602         path = __path_find(dev, daddr + 4);
603         if (!path) {
604                 path = path_rec_create(dev, daddr + 4);
605                 if (!path)
606                         goto err_path;
607
608                 __path_add(dev, path);
609         }
610
611         list_add_tail(&neigh->list, &path->neigh_list);
612
613         if (path->ah) {
614                 kref_get(&path->ah->ref);
615                 neigh->ah = path->ah;
616
617                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
618                         if (!ipoib_cm_get(neigh))
619                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
620                         if (!ipoib_cm_get(neigh)) {
621                                 list_del(&neigh->list);
622                                 ipoib_neigh_free(neigh);
623                                 goto err_drop;
624                         }
625                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
626                                 __skb_queue_tail(&neigh->queue, skb);
627                         else {
628                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
629                                            skb_queue_len(&neigh->queue));
630                                 goto err_drop;
631                         }
632                 } else {
633                         spin_unlock_irqrestore(&priv->lock, flags);
634                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
635                         ipoib_neigh_put(neigh);
636                         return;
637                 }
638         } else {
639                 neigh->ah  = NULL;
640
641                 if (!path->query && path_rec_start(dev, path))
642                         goto err_list;
643
644                 __skb_queue_tail(&neigh->queue, skb);
645         }
646
647         spin_unlock_irqrestore(&priv->lock, flags);
648         ipoib_neigh_put(neigh);
649         return;
650
651 err_list:
652         list_del(&neigh->list);
653
654 err_path:
655         ipoib_neigh_free(neigh);
656 err_drop:
657         ++dev->stats.tx_dropped;
658         dev_kfree_skb_any(skb);
659
660         spin_unlock_irqrestore(&priv->lock, flags);
661         ipoib_neigh_put(neigh);
662 }
663
664 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
665                              struct ipoib_cb *cb)
666 {
667         struct ipoib_dev_priv *priv = netdev_priv(dev);
668         struct ipoib_path *path;
669         unsigned long flags;
670
671         spin_lock_irqsave(&priv->lock, flags);
672
673         path = __path_find(dev, cb->hwaddr + 4);
674         if (!path || !path->valid) {
675                 int new_path = 0;
676
677                 if (!path) {
678                         path = path_rec_create(dev, cb->hwaddr + 4);
679                         new_path = 1;
680                 }
681                 if (path) {
682                         __skb_queue_tail(&path->queue, skb);
683
684                         if (!path->query && path_rec_start(dev, path)) {
685                                 spin_unlock_irqrestore(&priv->lock, flags);
686                                 if (new_path)
687                                         path_free(dev, path);
688                                 return;
689                         } else
690                                 __path_add(dev, path);
691                 } else {
692                         ++dev->stats.tx_dropped;
693                         dev_kfree_skb_any(skb);
694                 }
695
696                 spin_unlock_irqrestore(&priv->lock, flags);
697                 return;
698         }
699
700         if (path->ah) {
701                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
702                           be16_to_cpu(path->pathrec.dlid));
703
704                 spin_unlock_irqrestore(&priv->lock, flags);
705                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
706                 return;
707         } else if ((path->query || !path_rec_start(dev, path)) &&
708                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
709                 __skb_queue_tail(&path->queue, skb);
710         } else {
711                 ++dev->stats.tx_dropped;
712                 dev_kfree_skb_any(skb);
713         }
714
715         spin_unlock_irqrestore(&priv->lock, flags);
716 }
717
718 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
719 {
720         struct ipoib_dev_priv *priv = netdev_priv(dev);
721         struct ipoib_neigh *neigh;
722         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
723         struct ipoib_header *header;
724         unsigned long flags;
725
726         header = (struct ipoib_header *) skb->data;
727
728         if (unlikely(cb->hwaddr[4] == 0xff)) {
729                 /* multicast, arrange "if" according to probability */
730                 if ((header->proto != htons(ETH_P_IP)) &&
731                     (header->proto != htons(ETH_P_IPV6)) &&
732                     (header->proto != htons(ETH_P_ARP)) &&
733                     (header->proto != htons(ETH_P_RARP))) {
734                         /* ethertype not supported by IPoIB */
735                         ++dev->stats.tx_dropped;
736                         dev_kfree_skb_any(skb);
737                         return NETDEV_TX_OK;
738                 }
739                 /* Add in the P_Key for multicast*/
740                 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
741                 cb->hwaddr[9] = priv->pkey & 0xff;
742
743                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
744                 if (likely(neigh))
745                         goto send_using_neigh;
746                 ipoib_mcast_send(dev, cb->hwaddr, skb);
747                 return NETDEV_TX_OK;
748         }
749
750         /* unicast, arrange "switch" according to probability */
751         switch (header->proto) {
752         case htons(ETH_P_IP):
753         case htons(ETH_P_IPV6):
754                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
755                 if (unlikely(!neigh)) {
756                         neigh_add_path(skb, cb->hwaddr, dev);
757                         return NETDEV_TX_OK;
758                 }
759                 break;
760         case htons(ETH_P_ARP):
761         case htons(ETH_P_RARP):
762                 /* for unicast ARP and RARP should always perform path find */
763                 unicast_arp_send(skb, dev, cb);
764                 return NETDEV_TX_OK;
765         default:
766                 /* ethertype not supported by IPoIB */
767                 ++dev->stats.tx_dropped;
768                 dev_kfree_skb_any(skb);
769                 return NETDEV_TX_OK;
770         }
771
772 send_using_neigh:
773         /* note we now hold a ref to neigh */
774         if (ipoib_cm_get(neigh)) {
775                 if (ipoib_cm_up(neigh)) {
776                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
777                         goto unref;
778                 }
779         } else if (neigh->ah) {
780                 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
781                 goto unref;
782         }
783
784         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
785                 spin_lock_irqsave(&priv->lock, flags);
786                 __skb_queue_tail(&neigh->queue, skb);
787                 spin_unlock_irqrestore(&priv->lock, flags);
788         } else {
789                 ++dev->stats.tx_dropped;
790                 dev_kfree_skb_any(skb);
791         }
792
793 unref:
794         ipoib_neigh_put(neigh);
795
796         return NETDEV_TX_OK;
797 }
798
799 static void ipoib_timeout(struct net_device *dev)
800 {
801         struct ipoib_dev_priv *priv = netdev_priv(dev);
802
803         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
804                    jiffies_to_msecs(jiffies - dev->trans_start));
805         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
806                    netif_queue_stopped(dev),
807                    priv->tx_head, priv->tx_tail);
808         /* XXX reset QP, etc. */
809 }
810
811 static int ipoib_hard_header(struct sk_buff *skb,
812                              struct net_device *dev,
813                              unsigned short type,
814                              const void *daddr, const void *saddr, unsigned len)
815 {
816         struct ipoib_header *header;
817         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
818
819         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
820
821         header->proto = htons(type);
822         header->reserved = 0;
823
824         /*
825          * we don't rely on dst_entry structure,  always stuff the
826          * destination address into skb->cb so we can figure out where
827          * to send the packet later.
828          */
829         memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
830
831         return sizeof *header;
832 }
833
834 static void ipoib_set_mcast_list(struct net_device *dev)
835 {
836         struct ipoib_dev_priv *priv = netdev_priv(dev);
837
838         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
839                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
840                 return;
841         }
842
843         queue_work(ipoib_workqueue, &priv->restart_task);
844 }
845
846 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
847 {
848         /*
849          * Use only the address parts that contributes to spreading
850          * The subnet prefix is not used as one can not connect to
851          * same remote port (GUID) using the same remote QPN via two
852          * different subnets.
853          */
854          /* qpn octets[1:4) & port GUID octets[12:20) */
855         u32 *d32 = (u32 *) daddr;
856         u32 hv;
857
858         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
859         return hv & htbl->mask;
860 }
861
862 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
863 {
864         struct ipoib_dev_priv *priv = netdev_priv(dev);
865         struct ipoib_neigh_table *ntbl = &priv->ntbl;
866         struct ipoib_neigh_hash *htbl;
867         struct ipoib_neigh *neigh = NULL;
868         u32 hash_val;
869
870         rcu_read_lock_bh();
871
872         htbl = rcu_dereference_bh(ntbl->htbl);
873
874         if (!htbl)
875                 goto out_unlock;
876
877         hash_val = ipoib_addr_hash(htbl, daddr);
878         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
879              neigh != NULL;
880              neigh = rcu_dereference_bh(neigh->hnext)) {
881                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
882                         /* found, take one ref on behalf of the caller */
883                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
884                                 /* deleted */
885                                 neigh = NULL;
886                                 goto out_unlock;
887                         }
888                         neigh->alive = jiffies;
889                         goto out_unlock;
890                 }
891         }
892
893 out_unlock:
894         rcu_read_unlock_bh();
895         return neigh;
896 }
897
898 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
899 {
900         struct ipoib_neigh_table *ntbl = &priv->ntbl;
901         struct ipoib_neigh_hash *htbl;
902         unsigned long neigh_obsolete;
903         unsigned long dt;
904         unsigned long flags;
905         int i;
906
907         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
908                 return;
909
910         spin_lock_irqsave(&priv->lock, flags);
911
912         htbl = rcu_dereference_protected(ntbl->htbl,
913                                          lockdep_is_held(&priv->lock));
914
915         if (!htbl)
916                 goto out_unlock;
917
918         /* neigh is obsolete if it was idle for two GC periods */
919         dt = 2 * arp_tbl.gc_interval;
920         neigh_obsolete = jiffies - dt;
921         /* handle possible race condition */
922         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
923                 goto out_unlock;
924
925         for (i = 0; i < htbl->size; i++) {
926                 struct ipoib_neigh *neigh;
927                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
928
929                 while ((neigh = rcu_dereference_protected(*np,
930                                                           lockdep_is_held(&priv->lock))) != NULL) {
931                         /* was the neigh idle for two GC periods */
932                         if (time_after(neigh_obsolete, neigh->alive)) {
933                                 rcu_assign_pointer(*np,
934                                                    rcu_dereference_protected(neigh->hnext,
935                                                                              lockdep_is_held(&priv->lock)));
936                                 /* remove from path/mc list */
937                                 list_del(&neigh->list);
938                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
939                         } else {
940                                 np = &neigh->hnext;
941                         }
942
943                 }
944         }
945
946 out_unlock:
947         spin_unlock_irqrestore(&priv->lock, flags);
948 }
949
950 static void ipoib_reap_neigh(struct work_struct *work)
951 {
952         struct ipoib_dev_priv *priv =
953                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
954
955         __ipoib_reap_neigh(priv);
956
957         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
958                 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
959                                    arp_tbl.gc_interval);
960 }
961
962
963 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
964                                       struct net_device *dev)
965 {
966         struct ipoib_neigh *neigh;
967
968         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
969         if (!neigh)
970                 return NULL;
971
972         neigh->dev = dev;
973         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
974         skb_queue_head_init(&neigh->queue);
975         INIT_LIST_HEAD(&neigh->list);
976         ipoib_cm_set(neigh, NULL);
977         /* one ref on behalf of the caller */
978         atomic_set(&neigh->refcnt, 1);
979
980         return neigh;
981 }
982
983 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
984                                       struct net_device *dev)
985 {
986         struct ipoib_dev_priv *priv = netdev_priv(dev);
987         struct ipoib_neigh_table *ntbl = &priv->ntbl;
988         struct ipoib_neigh_hash *htbl;
989         struct ipoib_neigh *neigh;
990         u32 hash_val;
991
992         htbl = rcu_dereference_protected(ntbl->htbl,
993                                          lockdep_is_held(&priv->lock));
994         if (!htbl) {
995                 neigh = NULL;
996                 goto out_unlock;
997         }
998
999         /* need to add a new neigh, but maybe some other thread succeeded?
1000          * recalc hash, maybe hash resize took place so we do a search
1001          */
1002         hash_val = ipoib_addr_hash(htbl, daddr);
1003         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1004                                                lockdep_is_held(&priv->lock));
1005              neigh != NULL;
1006              neigh = rcu_dereference_protected(neigh->hnext,
1007                                                lockdep_is_held(&priv->lock))) {
1008                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1009                         /* found, take one ref on behalf of the caller */
1010                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1011                                 /* deleted */
1012                                 neigh = NULL;
1013                                 break;
1014                         }
1015                         neigh->alive = jiffies;
1016                         goto out_unlock;
1017                 }
1018         }
1019
1020         neigh = ipoib_neigh_ctor(daddr, dev);
1021         if (!neigh)
1022                 goto out_unlock;
1023
1024         /* one ref on behalf of the hash table */
1025         atomic_inc(&neigh->refcnt);
1026         neigh->alive = jiffies;
1027         /* put in hash */
1028         rcu_assign_pointer(neigh->hnext,
1029                            rcu_dereference_protected(htbl->buckets[hash_val],
1030                                                      lockdep_is_held(&priv->lock)));
1031         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1032         atomic_inc(&ntbl->entries);
1033
1034 out_unlock:
1035
1036         return neigh;
1037 }
1038
1039 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1040 {
1041         /* neigh reference count was dropprd to zero */
1042         struct net_device *dev = neigh->dev;
1043         struct ipoib_dev_priv *priv = netdev_priv(dev);
1044         struct sk_buff *skb;
1045         if (neigh->ah)
1046                 ipoib_put_ah(neigh->ah);
1047         while ((skb = __skb_dequeue(&neigh->queue))) {
1048                 ++dev->stats.tx_dropped;
1049                 dev_kfree_skb_any(skb);
1050         }
1051         if (ipoib_cm_get(neigh))
1052                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1053         ipoib_dbg(netdev_priv(dev),
1054                   "neigh free for %06x %pI6\n",
1055                   IPOIB_QPN(neigh->daddr),
1056                   neigh->daddr + 4);
1057         kfree(neigh);
1058         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1059                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1060                         complete(&priv->ntbl.flushed);
1061         }
1062 }
1063
1064 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1065 {
1066         /* Called as a result of removal from hash table */
1067         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1068         /* note TX context may hold another ref */
1069         ipoib_neigh_put(neigh);
1070 }
1071
1072 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1073 {
1074         struct net_device *dev = neigh->dev;
1075         struct ipoib_dev_priv *priv = netdev_priv(dev);
1076         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1077         struct ipoib_neigh_hash *htbl;
1078         struct ipoib_neigh __rcu **np;
1079         struct ipoib_neigh *n;
1080         u32 hash_val;
1081
1082         htbl = rcu_dereference_protected(ntbl->htbl,
1083                                         lockdep_is_held(&priv->lock));
1084         if (!htbl)
1085                 return;
1086
1087         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1088         np = &htbl->buckets[hash_val];
1089         for (n = rcu_dereference_protected(*np,
1090                                             lockdep_is_held(&priv->lock));
1091              n != NULL;
1092              n = rcu_dereference_protected(*np,
1093                                         lockdep_is_held(&priv->lock))) {
1094                 if (n == neigh) {
1095                         /* found */
1096                         rcu_assign_pointer(*np,
1097                                            rcu_dereference_protected(neigh->hnext,
1098                                                                      lockdep_is_held(&priv->lock)));
1099                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1100                         return;
1101                 } else {
1102                         np = &n->hnext;
1103                 }
1104         }
1105 }
1106
1107 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1108 {
1109         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1110         struct ipoib_neigh_hash *htbl;
1111         struct ipoib_neigh **buckets;
1112         u32 size;
1113
1114         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1115         ntbl->htbl = NULL;
1116         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1117         if (!htbl)
1118                 return -ENOMEM;
1119         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1120         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1121         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1122         if (!buckets) {
1123                 kfree(htbl);
1124                 return -ENOMEM;
1125         }
1126         htbl->size = size;
1127         htbl->mask = (size - 1);
1128         htbl->buckets = buckets;
1129         ntbl->htbl = htbl;
1130         htbl->ntbl = ntbl;
1131         atomic_set(&ntbl->entries, 0);
1132
1133         /* start garbage collection */
1134         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1135         queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
1136                            arp_tbl.gc_interval);
1137
1138         return 0;
1139 }
1140
1141 static void neigh_hash_free_rcu(struct rcu_head *head)
1142 {
1143         struct ipoib_neigh_hash *htbl = container_of(head,
1144                                                     struct ipoib_neigh_hash,
1145                                                     rcu);
1146         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1147         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1148
1149         kfree(buckets);
1150         kfree(htbl);
1151         complete(&ntbl->deleted);
1152 }
1153
1154 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1155 {
1156         struct ipoib_dev_priv *priv = netdev_priv(dev);
1157         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1158         struct ipoib_neigh_hash *htbl;
1159         unsigned long flags;
1160         int i;
1161
1162         /* remove all neigh connected to a given path or mcast */
1163         spin_lock_irqsave(&priv->lock, flags);
1164
1165         htbl = rcu_dereference_protected(ntbl->htbl,
1166                                          lockdep_is_held(&priv->lock));
1167
1168         if (!htbl)
1169                 goto out_unlock;
1170
1171         for (i = 0; i < htbl->size; i++) {
1172                 struct ipoib_neigh *neigh;
1173                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1174
1175                 while ((neigh = rcu_dereference_protected(*np,
1176                                                           lockdep_is_held(&priv->lock))) != NULL) {
1177                         /* delete neighs belong to this parent */
1178                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1179                                 rcu_assign_pointer(*np,
1180                                                    rcu_dereference_protected(neigh->hnext,
1181                                                                              lockdep_is_held(&priv->lock)));
1182                                 /* remove from parent list */
1183                                 list_del(&neigh->list);
1184                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1185                         } else {
1186                                 np = &neigh->hnext;
1187                         }
1188
1189                 }
1190         }
1191 out_unlock:
1192         spin_unlock_irqrestore(&priv->lock, flags);
1193 }
1194
1195 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1196 {
1197         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1198         struct ipoib_neigh_hash *htbl;
1199         unsigned long flags;
1200         int i, wait_flushed = 0;
1201
1202         init_completion(&priv->ntbl.flushed);
1203
1204         spin_lock_irqsave(&priv->lock, flags);
1205
1206         htbl = rcu_dereference_protected(ntbl->htbl,
1207                                         lockdep_is_held(&priv->lock));
1208         if (!htbl)
1209                 goto out_unlock;
1210
1211         wait_flushed = atomic_read(&priv->ntbl.entries);
1212         if (!wait_flushed)
1213                 goto free_htbl;
1214
1215         for (i = 0; i < htbl->size; i++) {
1216                 struct ipoib_neigh *neigh;
1217                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1218
1219                 while ((neigh = rcu_dereference_protected(*np,
1220                                        lockdep_is_held(&priv->lock))) != NULL) {
1221                         rcu_assign_pointer(*np,
1222                                            rcu_dereference_protected(neigh->hnext,
1223                                                                      lockdep_is_held(&priv->lock)));
1224                         /* remove from path/mc list */
1225                         list_del(&neigh->list);
1226                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1227                 }
1228         }
1229
1230 free_htbl:
1231         rcu_assign_pointer(ntbl->htbl, NULL);
1232         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1233
1234 out_unlock:
1235         spin_unlock_irqrestore(&priv->lock, flags);
1236         if (wait_flushed)
1237                 wait_for_completion(&priv->ntbl.flushed);
1238 }
1239
1240 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1241 {
1242         struct ipoib_dev_priv *priv = netdev_priv(dev);
1243         int stopped;
1244
1245         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1246         init_completion(&priv->ntbl.deleted);
1247         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1248
1249         /* Stop GC if called at init fail need to cancel work */
1250         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1251         if (!stopped)
1252                 cancel_delayed_work(&priv->neigh_reap_task);
1253
1254         ipoib_flush_neighs(priv);
1255
1256         wait_for_completion(&priv->ntbl.deleted);
1257 }
1258
1259
1260 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1261 {
1262         struct ipoib_dev_priv *priv = netdev_priv(dev);
1263
1264         if (ipoib_neigh_hash_init(priv) < 0)
1265                 goto out;
1266         /* Allocate RX/TX "rings" to hold queued skbs */
1267         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1268                                 GFP_KERNEL);
1269         if (!priv->rx_ring) {
1270                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1271                        ca->name, ipoib_recvq_size);
1272                 goto out_neigh_hash_cleanup;
1273         }
1274
1275         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1276         if (!priv->tx_ring) {
1277                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1278                        ca->name, ipoib_sendq_size);
1279                 goto out_rx_ring_cleanup;
1280         }
1281
1282         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1283
1284         if (ipoib_ib_dev_init(dev, ca, port))
1285                 goto out_tx_ring_cleanup;
1286
1287         return 0;
1288
1289 out_tx_ring_cleanup:
1290         vfree(priv->tx_ring);
1291
1292 out_rx_ring_cleanup:
1293         kfree(priv->rx_ring);
1294
1295 out_neigh_hash_cleanup:
1296         ipoib_neigh_hash_uninit(dev);
1297 out:
1298         return -ENOMEM;
1299 }
1300
1301 void ipoib_dev_cleanup(struct net_device *dev)
1302 {
1303         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1304         LIST_HEAD(head);
1305
1306         ASSERT_RTNL();
1307
1308         ipoib_delete_debug_files(dev);
1309
1310         /* Delete any child interfaces first */
1311         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1312                 /* Stop GC on child */
1313                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1314                 cancel_delayed_work(&cpriv->neigh_reap_task);
1315                 unregister_netdevice_queue(cpriv->dev, &head);
1316         }
1317         unregister_netdevice_many(&head);
1318
1319         ipoib_ib_dev_cleanup(dev);
1320
1321         kfree(priv->rx_ring);
1322         vfree(priv->tx_ring);
1323
1324         priv->rx_ring = NULL;
1325         priv->tx_ring = NULL;
1326
1327         ipoib_neigh_hash_uninit(dev);
1328 }
1329
1330 static const struct header_ops ipoib_header_ops = {
1331         .create = ipoib_hard_header,
1332 };
1333
1334 static const struct net_device_ops ipoib_netdev_ops = {
1335         .ndo_uninit              = ipoib_uninit,
1336         .ndo_open                = ipoib_open,
1337         .ndo_stop                = ipoib_stop,
1338         .ndo_change_mtu          = ipoib_change_mtu,
1339         .ndo_fix_features        = ipoib_fix_features,
1340         .ndo_start_xmit          = ipoib_start_xmit,
1341         .ndo_tx_timeout          = ipoib_timeout,
1342         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1343 };
1344
1345 void ipoib_setup(struct net_device *dev)
1346 {
1347         struct ipoib_dev_priv *priv = netdev_priv(dev);
1348
1349         dev->netdev_ops          = &ipoib_netdev_ops;
1350         dev->header_ops          = &ipoib_header_ops;
1351
1352         ipoib_set_ethtool_ops(dev);
1353
1354         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1355
1356         dev->watchdog_timeo      = HZ;
1357
1358         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1359
1360         dev->hard_header_len     = IPOIB_ENCAP_LEN;
1361         dev->addr_len            = INFINIBAND_ALEN;
1362         dev->type                = ARPHRD_INFINIBAND;
1363         dev->tx_queue_len        = ipoib_sendq_size * 2;
1364         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1365                                     NETIF_F_HIGHDMA);
1366         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
1367
1368         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1369
1370         netif_carrier_off(dev);
1371
1372         priv->dev = dev;
1373
1374         spin_lock_init(&priv->lock);
1375
1376         mutex_init(&priv->vlan_mutex);
1377
1378         INIT_LIST_HEAD(&priv->path_list);
1379         INIT_LIST_HEAD(&priv->child_intfs);
1380         INIT_LIST_HEAD(&priv->dead_ahs);
1381         INIT_LIST_HEAD(&priv->multicast_list);
1382
1383         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1384         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1385         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1386         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1387         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1388         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1389         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1390         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1391         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1392 }
1393
1394 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1395 {
1396         struct net_device *dev;
1397
1398         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1399                            ipoib_setup);
1400         if (!dev)
1401                 return NULL;
1402
1403         return netdev_priv(dev);
1404 }
1405
1406 static ssize_t show_pkey(struct device *dev,
1407                          struct device_attribute *attr, char *buf)
1408 {
1409         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1410
1411         return sprintf(buf, "0x%04x\n", priv->pkey);
1412 }
1413 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1414
1415 static ssize_t show_umcast(struct device *dev,
1416                            struct device_attribute *attr, char *buf)
1417 {
1418         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1419
1420         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1421 }
1422
1423 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1424 {
1425         struct ipoib_dev_priv *priv = netdev_priv(ndev);
1426
1427         if (umcast_val > 0) {
1428                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1429                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1430                                 "by userspace\n");
1431         } else
1432                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1433 }
1434
1435 static ssize_t set_umcast(struct device *dev,
1436                           struct device_attribute *attr,
1437                           const char *buf, size_t count)
1438 {
1439         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1440
1441         ipoib_set_umcast(to_net_dev(dev), umcast_val);
1442
1443         return count;
1444 }
1445 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1446
1447 int ipoib_add_umcast_attr(struct net_device *dev)
1448 {
1449         return device_create_file(&dev->dev, &dev_attr_umcast);
1450 }
1451
1452 static ssize_t create_child(struct device *dev,
1453                             struct device_attribute *attr,
1454                             const char *buf, size_t count)
1455 {
1456         int pkey;
1457         int ret;
1458
1459         if (sscanf(buf, "%i", &pkey) != 1)
1460                 return -EINVAL;
1461
1462         if (pkey < 0 || pkey > 0xffff)
1463                 return -EINVAL;
1464
1465         /*
1466          * Set the full membership bit, so that we join the right
1467          * broadcast group, etc.
1468          */
1469         pkey |= 0x8000;
1470
1471         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1472
1473         return ret ? ret : count;
1474 }
1475 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1476
1477 static ssize_t delete_child(struct device *dev,
1478                             struct device_attribute *attr,
1479                             const char *buf, size_t count)
1480 {
1481         int pkey;
1482         int ret;
1483
1484         if (sscanf(buf, "%i", &pkey) != 1)
1485                 return -EINVAL;
1486
1487         if (pkey < 0 || pkey > 0xffff)
1488                 return -EINVAL;
1489
1490         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1491
1492         return ret ? ret : count;
1493
1494 }
1495 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1496
1497 int ipoib_add_pkey_attr(struct net_device *dev)
1498 {
1499         return device_create_file(&dev->dev, &dev_attr_pkey);
1500 }
1501
1502 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1503 {
1504         struct ib_device_attr *device_attr;
1505         int result = -ENOMEM;
1506
1507         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1508         if (!device_attr) {
1509                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1510                        hca->name, sizeof *device_attr);
1511                 return result;
1512         }
1513
1514         result = ib_query_device(hca, device_attr);
1515         if (result) {
1516                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1517                        hca->name, result);
1518                 kfree(device_attr);
1519                 return result;
1520         }
1521         priv->hca_caps = device_attr->device_cap_flags;
1522
1523         kfree(device_attr);
1524
1525         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1526                 priv->dev->hw_features = NETIF_F_SG |
1527                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1528
1529                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1530                         priv->dev->hw_features |= NETIF_F_TSO;
1531
1532                 priv->dev->features |= priv->dev->hw_features;
1533         }
1534
1535         return 0;
1536 }
1537
1538 static struct net_device *ipoib_add_port(const char *format,
1539                                          struct ib_device *hca, u8 port)
1540 {
1541         struct ipoib_dev_priv *priv;
1542         struct ib_port_attr attr;
1543         int result = -ENOMEM;
1544
1545         priv = ipoib_intf_alloc(format);
1546         if (!priv)
1547                 goto alloc_mem_failed;
1548
1549         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1550         priv->dev->dev_id = port - 1;
1551
1552         if (!ib_query_port(hca, port, &attr))
1553                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1554         else {
1555                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1556                        hca->name, port);
1557                 goto device_init_failed;
1558         }
1559
1560         /* MTU will be reset when mcast join happens */
1561         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1562         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1563
1564         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1565
1566         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1567         if (result) {
1568                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1569                        hca->name, port, result);
1570                 goto device_init_failed;
1571         }
1572
1573         if (ipoib_set_dev_features(priv, hca))
1574                 goto device_init_failed;
1575
1576         /*
1577          * Set the full membership bit, so that we join the right
1578          * broadcast group, etc.
1579          */
1580         priv->pkey |= 0x8000;
1581
1582         priv->dev->broadcast[8] = priv->pkey >> 8;
1583         priv->dev->broadcast[9] = priv->pkey & 0xff;
1584
1585         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1586         if (result) {
1587                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1588                        hca->name, port, result);
1589                 goto device_init_failed;
1590         } else
1591                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1592
1593         result = ipoib_dev_init(priv->dev, hca, port);
1594         if (result < 0) {
1595                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1596                        hca->name, port, result);
1597                 goto device_init_failed;
1598         }
1599
1600         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1601                               priv->ca, ipoib_event);
1602         result = ib_register_event_handler(&priv->event_handler);
1603         if (result < 0) {
1604                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1605                        "port %d (ret = %d)\n",
1606                        hca->name, port, result);
1607                 goto event_failed;
1608         }
1609
1610         result = register_netdev(priv->dev);
1611         if (result) {
1612                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1613                        hca->name, port, result);
1614                 goto register_failed;
1615         }
1616
1617         ipoib_create_debug_files(priv->dev);
1618
1619         if (ipoib_cm_add_mode_attr(priv->dev))
1620                 goto sysfs_failed;
1621         if (ipoib_add_pkey_attr(priv->dev))
1622                 goto sysfs_failed;
1623         if (ipoib_add_umcast_attr(priv->dev))
1624                 goto sysfs_failed;
1625         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1626                 goto sysfs_failed;
1627         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1628                 goto sysfs_failed;
1629
1630         return priv->dev;
1631
1632 sysfs_failed:
1633         ipoib_delete_debug_files(priv->dev);
1634         unregister_netdev(priv->dev);
1635
1636 register_failed:
1637         ib_unregister_event_handler(&priv->event_handler);
1638         /* Stop GC if started before flush */
1639         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1640         cancel_delayed_work(&priv->neigh_reap_task);
1641         flush_workqueue(ipoib_workqueue);
1642
1643 event_failed:
1644         ipoib_dev_cleanup(priv->dev);
1645
1646 device_init_failed:
1647         free_netdev(priv->dev);
1648
1649 alloc_mem_failed:
1650         return ERR_PTR(result);
1651 }
1652
1653 static void ipoib_add_one(struct ib_device *device)
1654 {
1655         struct list_head *dev_list;
1656         struct net_device *dev;
1657         struct ipoib_dev_priv *priv;
1658         int s, e, p;
1659
1660         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1661                 return;
1662
1663         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1664         if (!dev_list)
1665                 return;
1666
1667         INIT_LIST_HEAD(dev_list);
1668
1669         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1670                 s = 0;
1671                 e = 0;
1672         } else {
1673                 s = 1;
1674                 e = device->phys_port_cnt;
1675         }
1676
1677         for (p = s; p <= e; ++p) {
1678                 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1679                         continue;
1680                 dev = ipoib_add_port("ib%d", device, p);
1681                 if (!IS_ERR(dev)) {
1682                         priv = netdev_priv(dev);
1683                         list_add_tail(&priv->list, dev_list);
1684                 }
1685         }
1686
1687         ib_set_client_data(device, &ipoib_client, dev_list);
1688 }
1689
1690 static void ipoib_remove_one(struct ib_device *device)
1691 {
1692         struct ipoib_dev_priv *priv, *tmp;
1693         struct list_head *dev_list;
1694
1695         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1696                 return;
1697
1698         dev_list = ib_get_client_data(device, &ipoib_client);
1699         if (!dev_list)
1700                 return;
1701
1702         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1703                 ib_unregister_event_handler(&priv->event_handler);
1704
1705                 rtnl_lock();
1706                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1707                 rtnl_unlock();
1708
1709                 /* Stop GC */
1710                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1711                 cancel_delayed_work(&priv->neigh_reap_task);
1712                 flush_workqueue(ipoib_workqueue);
1713
1714                 unregister_netdev(priv->dev);
1715                 free_netdev(priv->dev);
1716         }
1717
1718         kfree(dev_list);
1719 }
1720
1721 static int __init ipoib_init_module(void)
1722 {
1723         int ret;
1724
1725         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1726         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1727         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1728
1729         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1730         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1731         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1732 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1733         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1734 #endif
1735
1736         /*
1737          * When copying small received packets, we only copy from the
1738          * linear data part of the SKB, so we rely on this condition.
1739          */
1740         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1741
1742         ret = ipoib_register_debugfs();
1743         if (ret)
1744                 return ret;
1745
1746         /*
1747          * We create our own workqueue mainly because we want to be
1748          * able to flush it when devices are being removed.  We can't
1749          * use schedule_work()/flush_scheduled_work() because both
1750          * unregister_netdev() and linkwatch_event take the rtnl lock,
1751          * so flush_scheduled_work() can deadlock during device
1752          * removal.
1753          */
1754         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1755         if (!ipoib_workqueue) {
1756                 ret = -ENOMEM;
1757                 goto err_fs;
1758         }
1759
1760         ib_sa_register_client(&ipoib_sa_client);
1761
1762         ret = ib_register_client(&ipoib_client);
1763         if (ret)
1764                 goto err_sa;
1765
1766         ret = ipoib_netlink_init();
1767         if (ret)
1768                 goto err_client;
1769
1770         return 0;
1771
1772 err_client:
1773         ib_unregister_client(&ipoib_client);
1774
1775 err_sa:
1776         ib_sa_unregister_client(&ipoib_sa_client);
1777         destroy_workqueue(ipoib_workqueue);
1778
1779 err_fs:
1780         ipoib_unregister_debugfs();
1781
1782         return ret;
1783 }
1784
1785 static void __exit ipoib_cleanup_module(void)
1786 {
1787         ipoib_netlink_fini();
1788         ib_unregister_client(&ipoib_client);
1789         ib_sa_unregister_client(&ipoib_sa_client);
1790         ipoib_unregister_debugfs();
1791         destroy_workqueue(ipoib_workqueue);
1792 }
1793
1794 module_init(ipoib_init_module);
1795 module_exit(ipoib_cleanup_module);