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