a2eb3b9789ebabb08f69f3b0421128900db22bd6
[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         int tx_dropped = 0;
73
74         ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
75                         mcast->mcmember.mgid.raw);
76
77         spin_lock_irq(&priv->lock);
78
79         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
80                 /*
81                  * It's safe to call ipoib_put_ah() inside priv->lock
82                  * here, because we know that mcast->ah will always
83                  * hold one more reference, so ipoib_put_ah() will
84                  * never do more than decrement the ref count.
85                  */
86                 if (neigh->ah)
87                         ipoib_put_ah(neigh->ah);
88                 ipoib_neigh_free(dev, neigh);
89         }
90
91         spin_unlock_irq(&priv->lock);
92
93         if (mcast->ah)
94                 ipoib_put_ah(mcast->ah);
95
96         while (!skb_queue_empty(&mcast->pkt_queue)) {
97                 ++tx_dropped;
98                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
99         }
100
101         netif_tx_lock_bh(dev);
102         dev->stats.tx_dropped += tx_dropped;
103         netif_tx_unlock_bh(dev);
104
105         kfree(mcast);
106 }
107
108 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
109                                              int can_sleep)
110 {
111         struct ipoib_mcast *mcast;
112
113         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
114         if (!mcast)
115                 return NULL;
116
117         mcast->dev = dev;
118         mcast->created = jiffies;
119         mcast->backoff = 1;
120
121         INIT_LIST_HEAD(&mcast->list);
122         INIT_LIST_HEAD(&mcast->neigh_list);
123         skb_queue_head_init(&mcast->pkt_queue);
124
125         return mcast;
126 }
127
128 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
129 {
130         struct ipoib_dev_priv *priv = netdev_priv(dev);
131         struct rb_node *n = priv->multicast_tree.rb_node;
132
133         while (n) {
134                 struct ipoib_mcast *mcast;
135                 int ret;
136
137                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
138
139                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
140                              sizeof (union ib_gid));
141                 if (ret < 0)
142                         n = n->rb_left;
143                 else if (ret > 0)
144                         n = n->rb_right;
145                 else
146                         return mcast;
147         }
148
149         return NULL;
150 }
151
152 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
153 {
154         struct ipoib_dev_priv *priv = netdev_priv(dev);
155         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
156
157         while (*n) {
158                 struct ipoib_mcast *tmcast;
159                 int ret;
160
161                 pn = *n;
162                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
163
164                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
165                              sizeof (union ib_gid));
166                 if (ret < 0)
167                         n = &pn->rb_left;
168                 else if (ret > 0)
169                         n = &pn->rb_right;
170                 else
171                         return -EEXIST;
172         }
173
174         rb_link_node(&mcast->rb_node, pn, n);
175         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
176
177         return 0;
178 }
179
180 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
181                                    struct ib_sa_mcmember_rec *mcmember)
182 {
183         struct net_device *dev = mcast->dev;
184         struct ipoib_dev_priv *priv = netdev_priv(dev);
185         struct ipoib_ah *ah;
186         int ret;
187         int set_qkey = 0;
188
189         mcast->mcmember = *mcmember;
190
191         /* Set the cached Q_Key before we attach if it's the broadcast group */
192         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
193                     sizeof (union ib_gid))) {
194                 spin_lock_irq(&priv->lock);
195                 if (!priv->broadcast) {
196                         spin_unlock_irq(&priv->lock);
197                         return -EAGAIN;
198                 }
199                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
200                 spin_unlock_irq(&priv->lock);
201                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
202                 set_qkey = 1;
203         }
204
205         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
206                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
207                         ipoib_warn(priv, "multicast group %pI6 already attached\n",
208                                    mcast->mcmember.mgid.raw);
209
210                         return 0;
211                 }
212
213                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
214                                          &mcast->mcmember.mgid, set_qkey);
215                 if (ret < 0) {
216                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
217                                    mcast->mcmember.mgid.raw);
218
219                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
220                         return ret;
221                 }
222         }
223
224         {
225                 struct ib_ah_attr av = {
226                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
227                         .port_num      = priv->port,
228                         .sl            = mcast->mcmember.sl,
229                         .ah_flags      = IB_AH_GRH,
230                         .static_rate   = mcast->mcmember.rate,
231                         .grh           = {
232                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
233                                 .hop_limit     = mcast->mcmember.hop_limit,
234                                 .sgid_index    = 0,
235                                 .traffic_class = mcast->mcmember.traffic_class
236                         }
237                 };
238                 av.grh.dgid = mcast->mcmember.mgid;
239
240                 ah = ipoib_create_ah(dev, priv->pd, &av);
241                 if (!ah) {
242                         ipoib_warn(priv, "ib_address_create failed\n");
243                 } else {
244                         spin_lock_irq(&priv->lock);
245                         mcast->ah = ah;
246                         spin_unlock_irq(&priv->lock);
247
248                         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
249                                         mcast->mcmember.mgid.raw,
250                                         mcast->ah->ah,
251                                         be16_to_cpu(mcast->mcmember.mlid),
252                                         mcast->mcmember.sl);
253                 }
254         }
255
256         /* actually send any queued packets */
257         netif_tx_lock_bh(dev);
258         while (!skb_queue_empty(&mcast->pkt_queue)) {
259                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
260                 netif_tx_unlock_bh(dev);
261
262                 skb->dev = dev;
263
264                 if (!skb->dst || !skb->dst->neighbour) {
265                         /* put pseudoheader back on for next time */
266                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
267                 }
268
269                 if (dev_queue_xmit(skb))
270                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
271                 netif_tx_lock_bh(dev);
272         }
273         netif_tx_unlock_bh(dev);
274
275         return 0;
276 }
277
278 static int
279 ipoib_mcast_sendonly_join_complete(int status,
280                                    struct ib_sa_multicast *multicast)
281 {
282         struct ipoib_mcast *mcast = multicast->context;
283         struct net_device *dev = mcast->dev;
284
285         /* We trap for port events ourselves. */
286         if (status == -ENETRESET)
287                 return 0;
288
289         if (!status)
290                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
291
292         if (status) {
293                 if (mcast->logcount++ < 20)
294                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n",
295                                         mcast->mcmember.mgid.raw, status);
296
297                 /* Flush out any queued packets */
298                 netif_tx_lock_bh(dev);
299                 while (!skb_queue_empty(&mcast->pkt_queue)) {
300                         ++dev->stats.tx_dropped;
301                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
302                 }
303                 netif_tx_unlock_bh(dev);
304
305                 /* Clear the busy flag so we try again */
306                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
307                                             &mcast->flags);
308         }
309         return status;
310 }
311
312 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
313 {
314         struct net_device *dev = mcast->dev;
315         struct ipoib_dev_priv *priv = netdev_priv(dev);
316         struct ib_sa_mcmember_rec rec = {
317 #if 0                           /* Some SMs don't support send-only yet */
318                 .join_state = 4
319 #else
320                 .join_state = 1
321 #endif
322         };
323         int ret = 0;
324
325         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
326                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
327                 return -ENODEV;
328         }
329
330         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
331                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
332                 return -EBUSY;
333         }
334
335         rec.mgid     = mcast->mcmember.mgid;
336         rec.port_gid = priv->local_gid;
337         rec.pkey     = cpu_to_be16(priv->pkey);
338
339         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
340                                          priv->port, &rec,
341                                          IB_SA_MCMEMBER_REC_MGID        |
342                                          IB_SA_MCMEMBER_REC_PORT_GID    |
343                                          IB_SA_MCMEMBER_REC_PKEY        |
344                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
345                                          GFP_ATOMIC,
346                                          ipoib_mcast_sendonly_join_complete,
347                                          mcast);
348         if (IS_ERR(mcast->mc)) {
349                 ret = PTR_ERR(mcast->mc);
350                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
351                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
352                            ret);
353         } else {
354                 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n",
355                                 mcast->mcmember.mgid.raw);
356         }
357
358         return ret;
359 }
360
361 void ipoib_mcast_carrier_on_task(struct work_struct *work)
362 {
363         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
364                                                    carrier_on_task);
365
366         /*
367          * Take rtnl_lock to avoid racing with ipoib_stop() and
368          * turning the carrier back on while a device is being
369          * removed.
370          */
371         rtnl_lock();
372         netif_carrier_on(priv->dev);
373         rtnl_unlock();
374 }
375
376 static int ipoib_mcast_join_complete(int status,
377                                      struct ib_sa_multicast *multicast)
378 {
379         struct ipoib_mcast *mcast = multicast->context;
380         struct net_device *dev = mcast->dev;
381         struct ipoib_dev_priv *priv = netdev_priv(dev);
382
383         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
384                         mcast->mcmember.mgid.raw, status);
385
386         /* We trap for port events ourselves. */
387         if (status == -ENETRESET)
388                 return 0;
389
390         if (!status)
391                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
392
393         if (!status) {
394                 mcast->backoff = 1;
395                 mutex_lock(&mcast_mutex);
396                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
397                         queue_delayed_work(ipoib_workqueue,
398                                            &priv->mcast_task, 0);
399                 mutex_unlock(&mcast_mutex);
400
401                 /*
402                  * Defer carrier on work to ipoib_workqueue to avoid a
403                  * deadlock on rtnl_lock here.
404                  */
405                 if (mcast == priv->broadcast)
406                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
407
408                 return 0;
409         }
410
411         if (mcast->logcount++ < 20) {
412                 if (status == -ETIMEDOUT) {
413                         ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
414                                         mcast->mcmember.mgid.raw, status);
415                 } else {
416                         ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
417                                    mcast->mcmember.mgid.raw, status);
418                 }
419         }
420
421         mcast->backoff *= 2;
422         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
423                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
424
425         /* Clear the busy flag so we try again */
426         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
427
428         mutex_lock(&mcast_mutex);
429         spin_lock_irq(&priv->lock);
430         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
431                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
432                                    mcast->backoff * HZ);
433         spin_unlock_irq(&priv->lock);
434         mutex_unlock(&mcast_mutex);
435
436         return status;
437 }
438
439 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
440                              int create)
441 {
442         struct ipoib_dev_priv *priv = netdev_priv(dev);
443         struct ib_sa_mcmember_rec rec = {
444                 .join_state = 1
445         };
446         ib_sa_comp_mask comp_mask;
447         int ret = 0;
448
449         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
450
451         rec.mgid     = mcast->mcmember.mgid;
452         rec.port_gid = priv->local_gid;
453         rec.pkey     = cpu_to_be16(priv->pkey);
454
455         comp_mask =
456                 IB_SA_MCMEMBER_REC_MGID         |
457                 IB_SA_MCMEMBER_REC_PORT_GID     |
458                 IB_SA_MCMEMBER_REC_PKEY         |
459                 IB_SA_MCMEMBER_REC_JOIN_STATE;
460
461         if (create) {
462                 comp_mask |=
463                         IB_SA_MCMEMBER_REC_QKEY                 |
464                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
465                         IB_SA_MCMEMBER_REC_MTU                  |
466                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
467                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
468                         IB_SA_MCMEMBER_REC_RATE                 |
469                         IB_SA_MCMEMBER_REC_SL                   |
470                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
471                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
472
473                 rec.qkey          = priv->broadcast->mcmember.qkey;
474                 rec.mtu_selector  = IB_SA_EQ;
475                 rec.mtu           = priv->broadcast->mcmember.mtu;
476                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
477                 rec.rate_selector = IB_SA_EQ;
478                 rec.rate          = priv->broadcast->mcmember.rate;
479                 rec.sl            = priv->broadcast->mcmember.sl;
480                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
481                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
482         }
483
484         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
485         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
486                                          &rec, comp_mask, GFP_KERNEL,
487                                          ipoib_mcast_join_complete, mcast);
488         if (IS_ERR(mcast->mc)) {
489                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
490                 ret = PTR_ERR(mcast->mc);
491                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
492
493                 mcast->backoff *= 2;
494                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
495                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
496
497                 mutex_lock(&mcast_mutex);
498                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
499                         queue_delayed_work(ipoib_workqueue,
500                                            &priv->mcast_task,
501                                            mcast->backoff * HZ);
502                 mutex_unlock(&mcast_mutex);
503         }
504 }
505
506 void ipoib_mcast_join_task(struct work_struct *work)
507 {
508         struct ipoib_dev_priv *priv =
509                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
510         struct net_device *dev = priv->dev;
511
512         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
513                 return;
514
515         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
516                 ipoib_warn(priv, "ib_query_gid() failed\n");
517         else
518                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
519
520         {
521                 struct ib_port_attr attr;
522
523                 if (!ib_query_port(priv->ca, priv->port, &attr))
524                         priv->local_lid = attr.lid;
525                 else
526                         ipoib_warn(priv, "ib_query_port failed\n");
527         }
528
529         if (!priv->broadcast) {
530                 struct ipoib_mcast *broadcast;
531
532                 broadcast = ipoib_mcast_alloc(dev, 1);
533                 if (!broadcast) {
534                         ipoib_warn(priv, "failed to allocate broadcast group\n");
535                         mutex_lock(&mcast_mutex);
536                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
537                                 queue_delayed_work(ipoib_workqueue,
538                                                    &priv->mcast_task, HZ);
539                         mutex_unlock(&mcast_mutex);
540                         return;
541                 }
542
543                 spin_lock_irq(&priv->lock);
544                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
545                        sizeof (union ib_gid));
546                 priv->broadcast = broadcast;
547
548                 __ipoib_mcast_add(dev, priv->broadcast);
549                 spin_unlock_irq(&priv->lock);
550         }
551
552         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
553                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
554                         ipoib_mcast_join(dev, priv->broadcast, 0);
555                 return;
556         }
557
558         while (1) {
559                 struct ipoib_mcast *mcast = NULL;
560
561                 spin_lock_irq(&priv->lock);
562                 list_for_each_entry(mcast, &priv->multicast_list, list) {
563                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
564                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
565                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
566                                 /* Found the next unjoined group */
567                                 break;
568                         }
569                 }
570                 spin_unlock_irq(&priv->lock);
571
572                 if (&mcast->list == &priv->multicast_list) {
573                         /* All done */
574                         break;
575                 }
576
577                 ipoib_mcast_join(dev, mcast, 1);
578                 return;
579         }
580
581         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
582
583         if (!ipoib_cm_admin_enabled(dev)) {
584                 rtnl_lock();
585                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
586                 rtnl_unlock();
587         }
588
589         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
590
591         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
592 }
593
594 int ipoib_mcast_start_thread(struct net_device *dev)
595 {
596         struct ipoib_dev_priv *priv = netdev_priv(dev);
597
598         ipoib_dbg_mcast(priv, "starting multicast thread\n");
599
600         mutex_lock(&mcast_mutex);
601         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
602                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
603         mutex_unlock(&mcast_mutex);
604
605         return 0;
606 }
607
608 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
609 {
610         struct ipoib_dev_priv *priv = netdev_priv(dev);
611
612         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
613
614         mutex_lock(&mcast_mutex);
615         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
616         cancel_delayed_work(&priv->mcast_task);
617         mutex_unlock(&mcast_mutex);
618
619         if (flush)
620                 flush_workqueue(ipoib_workqueue);
621
622         return 0;
623 }
624
625 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
626 {
627         struct ipoib_dev_priv *priv = netdev_priv(dev);
628         int ret = 0;
629
630         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
631                 ib_sa_free_multicast(mcast->mc);
632
633         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
634                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
635                                 mcast->mcmember.mgid.raw);
636
637                 /* Remove ourselves from the multicast group */
638                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
639                                       be16_to_cpu(mcast->mcmember.mlid));
640                 if (ret)
641                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
642         }
643
644         return 0;
645 }
646
647 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
648 {
649         struct ipoib_dev_priv *priv = netdev_priv(dev);
650         struct ipoib_mcast *mcast;
651         unsigned long flags;
652
653         spin_lock_irqsave(&priv->lock, flags);
654
655         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
656             !priv->broadcast                                    ||
657             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
658                 ++dev->stats.tx_dropped;
659                 dev_kfree_skb_any(skb);
660                 goto unlock;
661         }
662
663         mcast = __ipoib_mcast_find(dev, mgid);
664         if (!mcast) {
665                 /* Let's create a new send only group now */
666                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
667                                 mgid);
668
669                 mcast = ipoib_mcast_alloc(dev, 0);
670                 if (!mcast) {
671                         ipoib_warn(priv, "unable to allocate memory for "
672                                    "multicast structure\n");
673                         ++dev->stats.tx_dropped;
674                         dev_kfree_skb_any(skb);
675                         goto out;
676                 }
677
678                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
679                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
680                 __ipoib_mcast_add(dev, mcast);
681                 list_add_tail(&mcast->list, &priv->multicast_list);
682         }
683
684         if (!mcast->ah) {
685                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
686                         skb_queue_tail(&mcast->pkt_queue, skb);
687                 else {
688                         ++dev->stats.tx_dropped;
689                         dev_kfree_skb_any(skb);
690                 }
691
692                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
693                         ipoib_dbg_mcast(priv, "no address vector, "
694                                         "but multicast join already started\n");
695                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
696                         ipoib_mcast_sendonly_join(mcast);
697
698                 /*
699                  * If lookup completes between here and out:, don't
700                  * want to send packet twice.
701                  */
702                 mcast = NULL;
703         }
704
705 out:
706         if (mcast && mcast->ah) {
707                 if (skb->dst            &&
708                     skb->dst->neighbour &&
709                     !*to_ipoib_neigh(skb->dst->neighbour)) {
710                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
711                                                                         skb->dev);
712
713                         if (neigh) {
714                                 kref_get(&mcast->ah->ref);
715                                 neigh->ah       = mcast->ah;
716                                 list_add_tail(&neigh->list, &mcast->neigh_list);
717                         }
718                 }
719
720                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
721         }
722
723 unlock:
724         spin_unlock_irqrestore(&priv->lock, flags);
725 }
726
727 void ipoib_mcast_dev_flush(struct net_device *dev)
728 {
729         struct ipoib_dev_priv *priv = netdev_priv(dev);
730         LIST_HEAD(remove_list);
731         struct ipoib_mcast *mcast, *tmcast;
732         unsigned long flags;
733
734         ipoib_dbg_mcast(priv, "flushing multicast list\n");
735
736         spin_lock_irqsave(&priv->lock, flags);
737
738         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
739                 list_del(&mcast->list);
740                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
741                 list_add_tail(&mcast->list, &remove_list);
742         }
743
744         if (priv->broadcast) {
745                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
746                 list_add_tail(&priv->broadcast->list, &remove_list);
747                 priv->broadcast = NULL;
748         }
749
750         spin_unlock_irqrestore(&priv->lock, flags);
751
752         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
753                 ipoib_mcast_leave(dev, mcast);
754                 ipoib_mcast_free(mcast);
755         }
756 }
757
758 void ipoib_mcast_restart_task(struct work_struct *work)
759 {
760         struct ipoib_dev_priv *priv =
761                 container_of(work, struct ipoib_dev_priv, restart_task);
762         struct net_device *dev = priv->dev;
763         struct dev_mc_list *mclist;
764         struct ipoib_mcast *mcast, *tmcast;
765         LIST_HEAD(remove_list);
766         unsigned long flags;
767         struct ib_sa_mcmember_rec rec;
768
769         ipoib_dbg_mcast(priv, "restarting multicast task\n");
770
771         ipoib_mcast_stop_thread(dev, 0);
772
773         local_irq_save(flags);
774         netif_addr_lock(dev);
775         spin_lock(&priv->lock);
776
777         /*
778          * Unfortunately, the networking core only gives us a list of all of
779          * the multicast hardware addresses. We need to figure out which ones
780          * are new and which ones have been removed
781          */
782
783         /* Clear out the found flag */
784         list_for_each_entry(mcast, &priv->multicast_list, list)
785                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
786
787         /* Mark all of the entries that are found or don't exist */
788         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
789                 union ib_gid mgid;
790
791                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
792
793                 mcast = __ipoib_mcast_find(dev, &mgid);
794                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
795                         struct ipoib_mcast *nmcast;
796
797                         /* ignore group which is directly joined by userspace */
798                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
799                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
800                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
801                                                 mgid.raw);
802                                 continue;
803                         }
804
805                         /* Not found or send-only group, let's add a new entry */
806                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
807                                         mgid.raw);
808
809                         nmcast = ipoib_mcast_alloc(dev, 0);
810                         if (!nmcast) {
811                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
812                                 continue;
813                         }
814
815                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
816
817                         nmcast->mcmember.mgid = mgid;
818
819                         if (mcast) {
820                                 /* Destroy the send only entry */
821                                 list_move_tail(&mcast->list, &remove_list);
822
823                                 rb_replace_node(&mcast->rb_node,
824                                                 &nmcast->rb_node,
825                                                 &priv->multicast_tree);
826                         } else
827                                 __ipoib_mcast_add(dev, nmcast);
828
829                         list_add_tail(&nmcast->list, &priv->multicast_list);
830                 }
831
832                 if (mcast)
833                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
834         }
835
836         /* Remove all of the entries don't exist anymore */
837         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
838                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
839                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
840                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
841                                         mcast->mcmember.mgid.raw);
842
843                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
844
845                         /* Move to the remove list */
846                         list_move_tail(&mcast->list, &remove_list);
847                 }
848         }
849
850         spin_unlock(&priv->lock);
851         netif_addr_unlock(dev);
852         local_irq_restore(flags);
853
854         /* We have to cancel outside of the spinlock */
855         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
856                 ipoib_mcast_leave(mcast->dev, mcast);
857                 ipoib_mcast_free(mcast);
858         }
859
860         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
861                 ipoib_mcast_start_thread(dev);
862 }
863
864 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
865
866 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
867 {
868         struct ipoib_mcast_iter *iter;
869
870         iter = kmalloc(sizeof *iter, GFP_KERNEL);
871         if (!iter)
872                 return NULL;
873
874         iter->dev = dev;
875         memset(iter->mgid.raw, 0, 16);
876
877         if (ipoib_mcast_iter_next(iter)) {
878                 kfree(iter);
879                 return NULL;
880         }
881
882         return iter;
883 }
884
885 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
886 {
887         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
888         struct rb_node *n;
889         struct ipoib_mcast *mcast;
890         int ret = 1;
891
892         spin_lock_irq(&priv->lock);
893
894         n = rb_first(&priv->multicast_tree);
895
896         while (n) {
897                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
898
899                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
900                            sizeof (union ib_gid)) < 0) {
901                         iter->mgid      = mcast->mcmember.mgid;
902                         iter->created   = mcast->created;
903                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
904                         iter->complete  = !!mcast->ah;
905                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
906
907                         ret = 0;
908
909                         break;
910                 }
911
912                 n = rb_next(n);
913         }
914
915         spin_unlock_irq(&priv->lock);
916
917         return ret;
918 }
919
920 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
921                            union ib_gid *mgid,
922                            unsigned long *created,
923                            unsigned int *queuelen,
924                            unsigned int *complete,
925                            unsigned int *send_only)
926 {
927         *mgid      = iter->mgid;
928         *created   = iter->created;
929         *queuelen  = iter->queuelen;
930         *complete  = iter->complete;
931         *send_only = iter->send_only;
932 }
933
934 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */