Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6] / drivers / infiniband / ulp / ipoib / ipoib_multicast.c
1 /*
2  * Copyright (c) 2004, 2005 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 <linux/skbuff.h>
36 #include <linux/rtnetlink.h>
37 #include <linux/ip.h>
38 #include <linux/in.h>
39 #include <linux/igmp.h>
40 #include <linux/inetdevice.h>
41 #include <linux/delay.h>
42 #include <linux/completion.h>
43
44 #include <net/dst.h>
45
46 #include "ipoib.h"
47
48 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
49 static int mcast_debug_level;
50
51 module_param(mcast_debug_level, int, 0644);
52 MODULE_PARM_DESC(mcast_debug_level,
53                  "Enable multicast debug tracing if > 0");
54 #endif
55
56 static DEFINE_MUTEX(mcast_mutex);
57
58 struct ipoib_mcast_iter {
59         struct net_device *dev;
60         union ib_gid       mgid;
61         unsigned long      created;
62         unsigned int       queuelen;
63         unsigned int       complete;
64         unsigned int       send_only;
65 };
66
67 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
68 {
69         struct net_device *dev = mcast->dev;
70         struct ipoib_dev_priv *priv = netdev_priv(dev);
71         struct ipoib_neigh *neigh, *tmp;
72         int tx_dropped = 0;
73
74         ipoib_dbg_mcast(netdev_priv(dev),
75                         "deleting multicast group " IPOIB_GID_FMT "\n",
76                         IPOIB_GID_ARG(mcast->mcmember.mgid));
77
78         spin_lock_irq(&priv->lock);
79
80         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
81                 /*
82                  * It's safe to call ipoib_put_ah() inside priv->lock
83                  * here, because we know that mcast->ah will always
84                  * hold one more reference, so ipoib_put_ah() will
85                  * never do more than decrement the ref count.
86                  */
87                 if (neigh->ah)
88                         ipoib_put_ah(neigh->ah);
89                 ipoib_neigh_free(dev, neigh);
90         }
91
92         spin_unlock_irq(&priv->lock);
93
94         if (mcast->ah)
95                 ipoib_put_ah(mcast->ah);
96
97         while (!skb_queue_empty(&mcast->pkt_queue)) {
98                 ++tx_dropped;
99                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
100         }
101
102         netif_tx_lock_bh(dev);
103         dev->stats.tx_dropped += tx_dropped;
104         netif_tx_unlock_bh(dev);
105
106         kfree(mcast);
107 }
108
109 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
110                                              int can_sleep)
111 {
112         struct ipoib_mcast *mcast;
113
114         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
115         if (!mcast)
116                 return NULL;
117
118         mcast->dev = dev;
119         mcast->created = jiffies;
120         mcast->backoff = 1;
121
122         INIT_LIST_HEAD(&mcast->list);
123         INIT_LIST_HEAD(&mcast->neigh_list);
124         skb_queue_head_init(&mcast->pkt_queue);
125
126         return mcast;
127 }
128
129 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
130 {
131         struct ipoib_dev_priv *priv = netdev_priv(dev);
132         struct rb_node *n = priv->multicast_tree.rb_node;
133
134         while (n) {
135                 struct ipoib_mcast *mcast;
136                 int ret;
137
138                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
139
140                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
141                              sizeof (union ib_gid));
142                 if (ret < 0)
143                         n = n->rb_left;
144                 else if (ret > 0)
145                         n = n->rb_right;
146                 else
147                         return mcast;
148         }
149
150         return NULL;
151 }
152
153 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
154 {
155         struct ipoib_dev_priv *priv = netdev_priv(dev);
156         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
157
158         while (*n) {
159                 struct ipoib_mcast *tmcast;
160                 int ret;
161
162                 pn = *n;
163                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
164
165                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
166                              sizeof (union ib_gid));
167                 if (ret < 0)
168                         n = &pn->rb_left;
169                 else if (ret > 0)
170                         n = &pn->rb_right;
171                 else
172                         return -EEXIST;
173         }
174
175         rb_link_node(&mcast->rb_node, pn, n);
176         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
177
178         return 0;
179 }
180
181 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
182                                    struct ib_sa_mcmember_rec *mcmember)
183 {
184         struct net_device *dev = mcast->dev;
185         struct ipoib_dev_priv *priv = netdev_priv(dev);
186         struct ipoib_ah *ah;
187         int ret;
188         int set_qkey = 0;
189
190         mcast->mcmember = *mcmember;
191
192         /* Set the cached Q_Key before we attach if it's the broadcast group */
193         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
194                     sizeof (union ib_gid))) {
195                 spin_lock_irq(&priv->lock);
196                 if (!priv->broadcast) {
197                         spin_unlock_irq(&priv->lock);
198                         return -EAGAIN;
199                 }
200                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
201                 spin_unlock_irq(&priv->lock);
202                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
203                 set_qkey = 1;
204         }
205
206         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
207                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
208                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
209                                    " already attached\n",
210                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
211
212                         return 0;
213                 }
214
215                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
216                                          &mcast->mcmember.mgid, set_qkey);
217                 if (ret < 0) {
218                         ipoib_warn(priv, "couldn't attach QP to multicast group "
219                                    IPOIB_GID_FMT "\n",
220                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
221
222                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
223                         return ret;
224                 }
225         }
226
227         {
228                 struct ib_ah_attr av = {
229                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
230                         .port_num      = priv->port,
231                         .sl            = mcast->mcmember.sl,
232                         .ah_flags      = IB_AH_GRH,
233                         .static_rate   = mcast->mcmember.rate,
234                         .grh           = {
235                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
236                                 .hop_limit     = mcast->mcmember.hop_limit,
237                                 .sgid_index    = 0,
238                                 .traffic_class = mcast->mcmember.traffic_class
239                         }
240                 };
241                 av.grh.dgid = mcast->mcmember.mgid;
242
243                 ah = ipoib_create_ah(dev, priv->pd, &av);
244                 if (!ah) {
245                         ipoib_warn(priv, "ib_address_create failed\n");
246                 } else {
247                         spin_lock_irq(&priv->lock);
248                         mcast->ah = ah;
249                         spin_unlock_irq(&priv->lock);
250
251                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
252                                         " AV %p, LID 0x%04x, SL %d\n",
253                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
254                                         mcast->ah->ah,
255                                         be16_to_cpu(mcast->mcmember.mlid),
256                                         mcast->mcmember.sl);
257                 }
258         }
259
260         /* actually send any queued packets */
261         netif_tx_lock_bh(dev);
262         while (!skb_queue_empty(&mcast->pkt_queue)) {
263                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
264                 netif_tx_unlock_bh(dev);
265
266                 skb->dev = dev;
267
268                 if (!skb->dst || !skb->dst->neighbour) {
269                         /* put pseudoheader back on for next time */
270                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
271                 }
272
273                 if (dev_queue_xmit(skb))
274                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
275                 netif_tx_lock_bh(dev);
276         }
277         netif_tx_unlock_bh(dev);
278
279         return 0;
280 }
281
282 static int
283 ipoib_mcast_sendonly_join_complete(int status,
284                                    struct ib_sa_multicast *multicast)
285 {
286         struct ipoib_mcast *mcast = multicast->context;
287         struct net_device *dev = mcast->dev;
288
289         /* We trap for port events ourselves. */
290         if (status == -ENETRESET)
291                 return 0;
292
293         if (!status)
294                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
295
296         if (status) {
297                 if (mcast->logcount++ < 20)
298                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
299                                         IPOIB_GID_FMT ", status %d\n",
300                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
301
302                 /* Flush out any queued packets */
303                 netif_tx_lock_bh(dev);
304                 while (!skb_queue_empty(&mcast->pkt_queue)) {
305                         ++dev->stats.tx_dropped;
306                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
307                 }
308                 netif_tx_unlock_bh(dev);
309
310                 /* Clear the busy flag so we try again */
311                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
312                                             &mcast->flags);
313         }
314         return status;
315 }
316
317 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
318 {
319         struct net_device *dev = mcast->dev;
320         struct ipoib_dev_priv *priv = netdev_priv(dev);
321         struct ib_sa_mcmember_rec rec = {
322 #if 0                           /* Some SMs don't support send-only yet */
323                 .join_state = 4
324 #else
325                 .join_state = 1
326 #endif
327         };
328         int ret = 0;
329
330         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
331                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
332                 return -ENODEV;
333         }
334
335         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
336                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
337                 return -EBUSY;
338         }
339
340         rec.mgid     = mcast->mcmember.mgid;
341         rec.port_gid = priv->local_gid;
342         rec.pkey     = cpu_to_be16(priv->pkey);
343
344         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
345                                          priv->port, &rec,
346                                          IB_SA_MCMEMBER_REC_MGID        |
347                                          IB_SA_MCMEMBER_REC_PORT_GID    |
348                                          IB_SA_MCMEMBER_REC_PKEY        |
349                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
350                                          GFP_ATOMIC,
351                                          ipoib_mcast_sendonly_join_complete,
352                                          mcast);
353         if (IS_ERR(mcast->mc)) {
354                 ret = PTR_ERR(mcast->mc);
355                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
356                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
357                            ret);
358         } else {
359                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
360                                 ", starting join\n",
361                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
362         }
363
364         return ret;
365 }
366
367 void ipoib_mcast_carrier_on_task(struct work_struct *work)
368 {
369         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
370                                                    carrier_on_task);
371
372         /*
373          * Take rtnl_lock to avoid racing with ipoib_stop() and
374          * turning the carrier back on while a device is being
375          * removed.
376          */
377         rtnl_lock();
378         netif_carrier_on(priv->dev);
379         rtnl_unlock();
380 }
381
382 static int ipoib_mcast_join_complete(int status,
383                                      struct ib_sa_multicast *multicast)
384 {
385         struct ipoib_mcast *mcast = multicast->context;
386         struct net_device *dev = mcast->dev;
387         struct ipoib_dev_priv *priv = netdev_priv(dev);
388
389         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
390                         " (status %d)\n",
391                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
392
393         /* We trap for port events ourselves. */
394         if (status == -ENETRESET)
395                 return 0;
396
397         if (!status)
398                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
399
400         if (!status) {
401                 mcast->backoff = 1;
402                 mutex_lock(&mcast_mutex);
403                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
404                         queue_delayed_work(ipoib_workqueue,
405                                            &priv->mcast_task, 0);
406                 mutex_unlock(&mcast_mutex);
407
408                 /*
409                  * Defer carrier on work to ipoib_workqueue to avoid a
410                  * deadlock on rtnl_lock here.
411                  */
412                 if (mcast == priv->broadcast)
413                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
414
415                 return 0;
416         }
417
418         if (mcast->logcount++ < 20) {
419                 if (status == -ETIMEDOUT) {
420                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
421                                         ", status %d\n",
422                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
423                                         status);
424                 } else {
425                         ipoib_warn(priv, "multicast join failed for "
426                                    IPOIB_GID_FMT ", status %d\n",
427                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
428                                    status);
429                 }
430         }
431
432         mcast->backoff *= 2;
433         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
434                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
435
436         /* Clear the busy flag so we try again */
437         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
438
439         mutex_lock(&mcast_mutex);
440         spin_lock_irq(&priv->lock);
441         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
442                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
443                                    mcast->backoff * HZ);
444         spin_unlock_irq(&priv->lock);
445         mutex_unlock(&mcast_mutex);
446
447         return status;
448 }
449
450 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
451                              int create)
452 {
453         struct ipoib_dev_priv *priv = netdev_priv(dev);
454         struct ib_sa_mcmember_rec rec = {
455                 .join_state = 1
456         };
457         ib_sa_comp_mask comp_mask;
458         int ret = 0;
459
460         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
461                         IPOIB_GID_ARG(mcast->mcmember.mgid));
462
463         rec.mgid     = mcast->mcmember.mgid;
464         rec.port_gid = priv->local_gid;
465         rec.pkey     = cpu_to_be16(priv->pkey);
466
467         comp_mask =
468                 IB_SA_MCMEMBER_REC_MGID         |
469                 IB_SA_MCMEMBER_REC_PORT_GID     |
470                 IB_SA_MCMEMBER_REC_PKEY         |
471                 IB_SA_MCMEMBER_REC_JOIN_STATE;
472
473         if (create) {
474                 comp_mask |=
475                         IB_SA_MCMEMBER_REC_QKEY                 |
476                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
477                         IB_SA_MCMEMBER_REC_MTU                  |
478                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
479                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
480                         IB_SA_MCMEMBER_REC_RATE                 |
481                         IB_SA_MCMEMBER_REC_SL                   |
482                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
483                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
484
485                 rec.qkey          = priv->broadcast->mcmember.qkey;
486                 rec.mtu_selector  = IB_SA_EQ;
487                 rec.mtu           = priv->broadcast->mcmember.mtu;
488                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
489                 rec.rate_selector = IB_SA_EQ;
490                 rec.rate          = priv->broadcast->mcmember.rate;
491                 rec.sl            = priv->broadcast->mcmember.sl;
492                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
493                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
494         }
495
496         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
497         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
498                                          &rec, comp_mask, GFP_KERNEL,
499                                          ipoib_mcast_join_complete, mcast);
500         if (IS_ERR(mcast->mc)) {
501                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
502                 ret = PTR_ERR(mcast->mc);
503                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
504
505                 mcast->backoff *= 2;
506                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
507                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
508
509                 mutex_lock(&mcast_mutex);
510                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
511                         queue_delayed_work(ipoib_workqueue,
512                                            &priv->mcast_task,
513                                            mcast->backoff * HZ);
514                 mutex_unlock(&mcast_mutex);
515         }
516 }
517
518 void ipoib_mcast_join_task(struct work_struct *work)
519 {
520         struct ipoib_dev_priv *priv =
521                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
522         struct net_device *dev = priv->dev;
523
524         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
525                 return;
526
527         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
528                 ipoib_warn(priv, "ib_query_gid() failed\n");
529         else
530                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
531
532         {
533                 struct ib_port_attr attr;
534
535                 if (!ib_query_port(priv->ca, priv->port, &attr))
536                         priv->local_lid = attr.lid;
537                 else
538                         ipoib_warn(priv, "ib_query_port failed\n");
539         }
540
541         if (!priv->broadcast) {
542                 struct ipoib_mcast *broadcast;
543
544                 broadcast = ipoib_mcast_alloc(dev, 1);
545                 if (!broadcast) {
546                         ipoib_warn(priv, "failed to allocate broadcast group\n");
547                         mutex_lock(&mcast_mutex);
548                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
549                                 queue_delayed_work(ipoib_workqueue,
550                                                    &priv->mcast_task, HZ);
551                         mutex_unlock(&mcast_mutex);
552                         return;
553                 }
554
555                 spin_lock_irq(&priv->lock);
556                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
557                        sizeof (union ib_gid));
558                 priv->broadcast = broadcast;
559
560                 __ipoib_mcast_add(dev, priv->broadcast);
561                 spin_unlock_irq(&priv->lock);
562         }
563
564         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
565                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
566                         ipoib_mcast_join(dev, priv->broadcast, 0);
567                 return;
568         }
569
570         while (1) {
571                 struct ipoib_mcast *mcast = NULL;
572
573                 spin_lock_irq(&priv->lock);
574                 list_for_each_entry(mcast, &priv->multicast_list, list) {
575                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
576                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
577                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
578                                 /* Found the next unjoined group */
579                                 break;
580                         }
581                 }
582                 spin_unlock_irq(&priv->lock);
583
584                 if (&mcast->list == &priv->multicast_list) {
585                         /* All done */
586                         break;
587                 }
588
589                 ipoib_mcast_join(dev, mcast, 1);
590                 return;
591         }
592
593         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
594
595         if (!ipoib_cm_admin_enabled(dev)) {
596                 rtnl_lock();
597                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
598                 rtnl_unlock();
599         }
600
601         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
602
603         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
604 }
605
606 int ipoib_mcast_start_thread(struct net_device *dev)
607 {
608         struct ipoib_dev_priv *priv = netdev_priv(dev);
609
610         ipoib_dbg_mcast(priv, "starting multicast thread\n");
611
612         mutex_lock(&mcast_mutex);
613         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
614                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
615         mutex_unlock(&mcast_mutex);
616
617         return 0;
618 }
619
620 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
621 {
622         struct ipoib_dev_priv *priv = netdev_priv(dev);
623
624         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
625
626         mutex_lock(&mcast_mutex);
627         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
628         cancel_delayed_work(&priv->mcast_task);
629         mutex_unlock(&mcast_mutex);
630
631         if (flush)
632                 flush_workqueue(ipoib_workqueue);
633
634         return 0;
635 }
636
637 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
638 {
639         struct ipoib_dev_priv *priv = netdev_priv(dev);
640         int ret = 0;
641
642         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
643                 ib_sa_free_multicast(mcast->mc);
644
645         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
646                 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
647                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
648
649                 /* Remove ourselves from the multicast group */
650                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
651                                       be16_to_cpu(mcast->mcmember.mlid));
652                 if (ret)
653                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
654         }
655
656         return 0;
657 }
658
659 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
660 {
661         struct ipoib_dev_priv *priv = netdev_priv(dev);
662         struct ipoib_mcast *mcast;
663         unsigned long flags;
664
665         spin_lock_irqsave(&priv->lock, flags);
666
667         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
668             !priv->broadcast                                    ||
669             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
670                 ++dev->stats.tx_dropped;
671                 dev_kfree_skb_any(skb);
672                 goto unlock;
673         }
674
675         mcast = __ipoib_mcast_find(dev, mgid);
676         if (!mcast) {
677                 /* Let's create a new send only group now */
678                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
679                                 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
680
681                 mcast = ipoib_mcast_alloc(dev, 0);
682                 if (!mcast) {
683                         ipoib_warn(priv, "unable to allocate memory for "
684                                    "multicast structure\n");
685                         ++dev->stats.tx_dropped;
686                         dev_kfree_skb_any(skb);
687                         goto out;
688                 }
689
690                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
691                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
692                 __ipoib_mcast_add(dev, mcast);
693                 list_add_tail(&mcast->list, &priv->multicast_list);
694         }
695
696         if (!mcast->ah) {
697                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
698                         skb_queue_tail(&mcast->pkt_queue, skb);
699                 else {
700                         ++dev->stats.tx_dropped;
701                         dev_kfree_skb_any(skb);
702                 }
703
704                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
705                         ipoib_dbg_mcast(priv, "no address vector, "
706                                         "but multicast join already started\n");
707                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
708                         ipoib_mcast_sendonly_join(mcast);
709
710                 /*
711                  * If lookup completes between here and out:, don't
712                  * want to send packet twice.
713                  */
714                 mcast = NULL;
715         }
716
717 out:
718         if (mcast && mcast->ah) {
719                 if (skb->dst            &&
720                     skb->dst->neighbour &&
721                     !*to_ipoib_neigh(skb->dst->neighbour)) {
722                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
723                                                                         skb->dev);
724
725                         if (neigh) {
726                                 kref_get(&mcast->ah->ref);
727                                 neigh->ah       = mcast->ah;
728                                 list_add_tail(&neigh->list, &mcast->neigh_list);
729                         }
730                 }
731
732                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
733         }
734
735 unlock:
736         spin_unlock_irqrestore(&priv->lock, flags);
737 }
738
739 void ipoib_mcast_dev_flush(struct net_device *dev)
740 {
741         struct ipoib_dev_priv *priv = netdev_priv(dev);
742         LIST_HEAD(remove_list);
743         struct ipoib_mcast *mcast, *tmcast;
744         unsigned long flags;
745
746         ipoib_dbg_mcast(priv, "flushing multicast list\n");
747
748         spin_lock_irqsave(&priv->lock, flags);
749
750         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
751                 list_del(&mcast->list);
752                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
753                 list_add_tail(&mcast->list, &remove_list);
754         }
755
756         if (priv->broadcast) {
757                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
758                 list_add_tail(&priv->broadcast->list, &remove_list);
759                 priv->broadcast = NULL;
760         }
761
762         spin_unlock_irqrestore(&priv->lock, flags);
763
764         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
765                 ipoib_mcast_leave(dev, mcast);
766                 ipoib_mcast_free(mcast);
767         }
768 }
769
770 void ipoib_mcast_restart_task(struct work_struct *work)
771 {
772         struct ipoib_dev_priv *priv =
773                 container_of(work, struct ipoib_dev_priv, restart_task);
774         struct net_device *dev = priv->dev;
775         struct dev_mc_list *mclist;
776         struct ipoib_mcast *mcast, *tmcast;
777         LIST_HEAD(remove_list);
778         unsigned long flags;
779         struct ib_sa_mcmember_rec rec;
780
781         ipoib_dbg_mcast(priv, "restarting multicast task\n");
782
783         ipoib_mcast_stop_thread(dev, 0);
784
785         local_irq_save(flags);
786         netif_addr_lock(dev);
787         spin_lock(&priv->lock);
788
789         /*
790          * Unfortunately, the networking core only gives us a list of all of
791          * the multicast hardware addresses. We need to figure out which ones
792          * are new and which ones have been removed
793          */
794
795         /* Clear out the found flag */
796         list_for_each_entry(mcast, &priv->multicast_list, list)
797                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
798
799         /* Mark all of the entries that are found or don't exist */
800         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
801                 union ib_gid mgid;
802
803                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
804
805                 mcast = __ipoib_mcast_find(dev, &mgid);
806                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
807                         struct ipoib_mcast *nmcast;
808
809                         /* ignore group which is directly joined by userspace */
810                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
811                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
812                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid "
813                                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
814                                 continue;
815                         }
816
817                         /* Not found or send-only group, let's add a new entry */
818                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
819                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
820
821                         nmcast = ipoib_mcast_alloc(dev, 0);
822                         if (!nmcast) {
823                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
824                                 continue;
825                         }
826
827                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
828
829                         nmcast->mcmember.mgid = mgid;
830
831                         if (mcast) {
832                                 /* Destroy the send only entry */
833                                 list_move_tail(&mcast->list, &remove_list);
834
835                                 rb_replace_node(&mcast->rb_node,
836                                                 &nmcast->rb_node,
837                                                 &priv->multicast_tree);
838                         } else
839                                 __ipoib_mcast_add(dev, nmcast);
840
841                         list_add_tail(&nmcast->list, &priv->multicast_list);
842                 }
843
844                 if (mcast)
845                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
846         }
847
848         /* Remove all of the entries don't exist anymore */
849         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
850                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
851                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
852                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
853                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
854
855                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
856
857                         /* Move to the remove list */
858                         list_move_tail(&mcast->list, &remove_list);
859                 }
860         }
861
862         spin_unlock(&priv->lock);
863         netif_addr_unlock(dev);
864         local_irq_restore(flags);
865
866         /* We have to cancel outside of the spinlock */
867         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
868                 ipoib_mcast_leave(mcast->dev, mcast);
869                 ipoib_mcast_free(mcast);
870         }
871
872         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
873                 ipoib_mcast_start_thread(dev);
874 }
875
876 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
877
878 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
879 {
880         struct ipoib_mcast_iter *iter;
881
882         iter = kmalloc(sizeof *iter, GFP_KERNEL);
883         if (!iter)
884                 return NULL;
885
886         iter->dev = dev;
887         memset(iter->mgid.raw, 0, 16);
888
889         if (ipoib_mcast_iter_next(iter)) {
890                 kfree(iter);
891                 return NULL;
892         }
893
894         return iter;
895 }
896
897 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
898 {
899         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
900         struct rb_node *n;
901         struct ipoib_mcast *mcast;
902         int ret = 1;
903
904         spin_lock_irq(&priv->lock);
905
906         n = rb_first(&priv->multicast_tree);
907
908         while (n) {
909                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
910
911                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
912                            sizeof (union ib_gid)) < 0) {
913                         iter->mgid      = mcast->mcmember.mgid;
914                         iter->created   = mcast->created;
915                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
916                         iter->complete  = !!mcast->ah;
917                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
918
919                         ret = 0;
920
921                         break;
922                 }
923
924                 n = rb_next(n);
925         }
926
927         spin_unlock_irq(&priv->lock);
928
929         return ret;
930 }
931
932 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
933                            union ib_gid *mgid,
934                            unsigned long *created,
935                            unsigned int *queuelen,
936                            unsigned int *complete,
937                            unsigned int *send_only)
938 {
939         *mgid      = iter->mgid;
940         *created   = iter->created;
941         *queuelen  = iter->queuelen;
942         *complete  = iter->complete;
943         *send_only = iter->send_only;
944 }
945
946 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */