IPoIB: Yet another fix for send-only joins
[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  * $Id: ipoib_multicast.c 1362 2004-12-18 15:56:29Z roland $
35  */
36
37 #include <linux/skbuff.h>
38 #include <linux/rtnetlink.h>
39 #include <linux/ip.h>
40 #include <linux/in.h>
41 #include <linux/igmp.h>
42 #include <linux/inetdevice.h>
43 #include <linux/delay.h>
44 #include <linux/completion.h>
45
46 #include <net/dst.h>
47
48 #include "ipoib.h"
49
50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
51 static int mcast_debug_level;
52
53 module_param(mcast_debug_level, int, 0644);
54 MODULE_PARM_DESC(mcast_debug_level,
55                  "Enable multicast debug tracing if > 0");
56 #endif
57
58 static DEFINE_MUTEX(mcast_mutex);
59
60 /* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
61 struct ipoib_mcast {
62         struct ib_sa_mcmember_rec mcmember;
63         struct ipoib_ah          *ah;
64
65         struct rb_node    rb_node;
66         struct list_head  list;
67         struct completion done;
68
69         int                 query_id;
70         struct ib_sa_query *query;
71
72         unsigned long created;
73         unsigned long backoff;
74
75         unsigned long flags;
76         unsigned char logcount;
77
78         struct list_head  neigh_list;
79
80         struct sk_buff_head pkt_queue;
81
82         struct net_device *dev;
83 };
84
85 struct ipoib_mcast_iter {
86         struct net_device *dev;
87         union ib_gid       mgid;
88         unsigned long      created;
89         unsigned int       queuelen;
90         unsigned int       complete;
91         unsigned int       send_only;
92 };
93
94 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
95 {
96         struct net_device *dev = mcast->dev;
97         struct ipoib_dev_priv *priv = netdev_priv(dev);
98         struct ipoib_neigh *neigh, *tmp;
99         unsigned long flags;
100         int tx_dropped = 0;
101
102         ipoib_dbg_mcast(netdev_priv(dev),
103                         "deleting multicast group " IPOIB_GID_FMT "\n",
104                         IPOIB_GID_ARG(mcast->mcmember.mgid));
105
106         spin_lock_irqsave(&priv->lock, flags);
107
108         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
109                 /*
110                  * It's safe to call ipoib_put_ah() inside priv->lock
111                  * here, because we know that mcast->ah will always
112                  * hold one more reference, so ipoib_put_ah() will
113                  * never do more than decrement the ref count.
114                  */
115                 if (neigh->ah)
116                         ipoib_put_ah(neigh->ah);
117                 *to_ipoib_neigh(neigh->neighbour) = NULL;
118                 neigh->neighbour->ops->destructor = NULL;
119                 kfree(neigh);
120         }
121
122         spin_unlock_irqrestore(&priv->lock, flags);
123
124         if (mcast->ah)
125                 ipoib_put_ah(mcast->ah);
126
127         while (!skb_queue_empty(&mcast->pkt_queue)) {
128                 ++tx_dropped;
129                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
130         }
131
132         spin_lock_irqsave(&priv->tx_lock, flags);
133         priv->stats.tx_dropped += tx_dropped;
134         spin_unlock_irqrestore(&priv->tx_lock, flags);
135
136         kfree(mcast);
137 }
138
139 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
140                                              int can_sleep)
141 {
142         struct ipoib_mcast *mcast;
143
144         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
145         if (!mcast)
146                 return NULL;
147
148         mcast->dev = dev;
149         mcast->created = jiffies;
150         mcast->backoff = 1;
151
152         INIT_LIST_HEAD(&mcast->list);
153         INIT_LIST_HEAD(&mcast->neigh_list);
154         skb_queue_head_init(&mcast->pkt_queue);
155
156         return mcast;
157 }
158
159 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *mgid)
160 {
161         struct ipoib_dev_priv *priv = netdev_priv(dev);
162         struct rb_node *n = priv->multicast_tree.rb_node;
163
164         while (n) {
165                 struct ipoib_mcast *mcast;
166                 int ret;
167
168                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
169
170                 ret = memcmp(mgid->raw, mcast->mcmember.mgid.raw,
171                              sizeof (union ib_gid));
172                 if (ret < 0)
173                         n = n->rb_left;
174                 else if (ret > 0)
175                         n = n->rb_right;
176                 else
177                         return mcast;
178         }
179
180         return NULL;
181 }
182
183 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
184 {
185         struct ipoib_dev_priv *priv = netdev_priv(dev);
186         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
187
188         while (*n) {
189                 struct ipoib_mcast *tmcast;
190                 int ret;
191
192                 pn = *n;
193                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
194
195                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
196                              sizeof (union ib_gid));
197                 if (ret < 0)
198                         n = &pn->rb_left;
199                 else if (ret > 0)
200                         n = &pn->rb_right;
201                 else
202                         return -EEXIST;
203         }
204
205         rb_link_node(&mcast->rb_node, pn, n);
206         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
207
208         return 0;
209 }
210
211 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
212                                    struct ib_sa_mcmember_rec *mcmember)
213 {
214         struct net_device *dev = mcast->dev;
215         struct ipoib_dev_priv *priv = netdev_priv(dev);
216         int ret;
217
218         mcast->mcmember = *mcmember;
219
220         /* Set the cached Q_Key before we attach if it's the broadcast group */
221         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
222                     sizeof (union ib_gid))) {
223                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
224                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
225         }
226
227         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
228                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
229                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
230                                    " already attached\n",
231                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
232
233                         return 0;
234                 }
235
236                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
237                                          &mcast->mcmember.mgid);
238                 if (ret < 0) {
239                         ipoib_warn(priv, "couldn't attach QP to multicast group "
240                                    IPOIB_GID_FMT "\n",
241                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
242
243                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
244                         return ret;
245                 }
246         }
247
248         {
249                 struct ib_ah_attr av = {
250                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
251                         .port_num      = priv->port,
252                         .sl            = mcast->mcmember.sl,
253                         .ah_flags      = IB_AH_GRH,
254                         .grh           = {
255                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
256                                 .hop_limit     = mcast->mcmember.hop_limit,
257                                 .sgid_index    = 0,
258                                 .traffic_class = mcast->mcmember.traffic_class
259                         }
260                 };
261                 int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate);
262
263                 av.grh.dgid = mcast->mcmember.mgid;
264
265                 if (path_rate > 0 && priv->local_rate > path_rate)
266                         av.static_rate = (priv->local_rate - 1) / path_rate;
267
268                 ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
269                                 av.static_rate, priv->local_rate,
270                                 ib_sa_rate_enum_to_int(mcast->mcmember.rate));
271
272                 mcast->ah = ipoib_create_ah(dev, priv->pd, &av);
273                 if (!mcast->ah) {
274                         ipoib_warn(priv, "ib_address_create failed\n");
275                 } else {
276                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
277                                         " AV %p, LID 0x%04x, SL %d\n",
278                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
279                                         mcast->ah->ah,
280                                         be16_to_cpu(mcast->mcmember.mlid),
281                                         mcast->mcmember.sl);
282                 }
283         }
284
285         /* actually send any queued packets */
286         spin_lock_irq(&priv->tx_lock);
287         while (!skb_queue_empty(&mcast->pkt_queue)) {
288                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
289                 spin_unlock_irq(&priv->tx_lock);
290
291                 skb->dev = dev;
292
293                 if (!skb->dst || !skb->dst->neighbour) {
294                         /* put pseudoheader back on for next time */
295                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
296                 }
297
298                 if (dev_queue_xmit(skb))
299                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
300                 spin_lock_irq(&priv->tx_lock);
301         }
302         spin_unlock_irq(&priv->tx_lock);
303
304         return 0;
305 }
306
307 static void
308 ipoib_mcast_sendonly_join_complete(int status,
309                                    struct ib_sa_mcmember_rec *mcmember,
310                                    void *mcast_ptr)
311 {
312         struct ipoib_mcast *mcast = mcast_ptr;
313         struct net_device *dev = mcast->dev;
314         struct ipoib_dev_priv *priv = netdev_priv(dev);
315
316         if (!status)
317                 ipoib_mcast_join_finish(mcast, mcmember);
318         else {
319                 if (mcast->logcount++ < 20)
320                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
321                                         IPOIB_GID_FMT ", status %d\n",
322                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
323
324                 /* Flush out any queued packets */
325                 spin_lock_irq(&priv->tx_lock);
326                 while (!skb_queue_empty(&mcast->pkt_queue)) {
327                         ++priv->stats.tx_dropped;
328                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
329                 }
330                 spin_unlock_irq(&priv->tx_lock);
331
332                 /* Clear the busy flag so we try again */
333                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
334         }
335
336         complete(&mcast->done);
337 }
338
339 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
340 {
341         struct net_device *dev = mcast->dev;
342         struct ipoib_dev_priv *priv = netdev_priv(dev);
343         struct ib_sa_mcmember_rec rec = {
344 #if 0                           /* Some SMs don't support send-only yet */
345                 .join_state = 4
346 #else
347                 .join_state = 1
348 #endif
349         };
350         int ret = 0;
351
352         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
353                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
354                 return -ENODEV;
355         }
356
357         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
358                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
359                 return -EBUSY;
360         }
361
362         rec.mgid     = mcast->mcmember.mgid;
363         rec.port_gid = priv->local_gid;
364         rec.pkey     = cpu_to_be16(priv->pkey);
365
366         init_completion(&mcast->done);
367
368         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec,
369                                      IB_SA_MCMEMBER_REC_MGID            |
370                                      IB_SA_MCMEMBER_REC_PORT_GID        |
371                                      IB_SA_MCMEMBER_REC_PKEY            |
372                                      IB_SA_MCMEMBER_REC_JOIN_STATE,
373                                      1000, GFP_ATOMIC,
374                                      ipoib_mcast_sendonly_join_complete,
375                                      mcast, &mcast->query);
376         if (ret < 0) {
377                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed (ret = %d)\n",
378                            ret);
379         } else {
380                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
381                                 ", starting join\n",
382                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
383
384                 mcast->query_id = ret;
385         }
386
387         return ret;
388 }
389
390 static void ipoib_mcast_join_complete(int status,
391                                       struct ib_sa_mcmember_rec *mcmember,
392                                       void *mcast_ptr)
393 {
394         struct ipoib_mcast *mcast = mcast_ptr;
395         struct net_device *dev = mcast->dev;
396         struct ipoib_dev_priv *priv = netdev_priv(dev);
397
398         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
399                         " (status %d)\n",
400                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
401
402         if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
403                 mcast->backoff = 1;
404                 mutex_lock(&mcast_mutex);
405                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
406                         queue_work(ipoib_workqueue, &priv->mcast_task);
407                 mutex_unlock(&mcast_mutex);
408                 complete(&mcast->done);
409                 return;
410         }
411
412         if (status == -EINTR) {
413                 complete(&mcast->done);
414                 return;
415         }
416
417         if (status && mcast->logcount++ < 20) {
418                 if (status == -ETIMEDOUT || status == -EINTR) {
419                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
420                                         ", status %d\n",
421                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
422                                         status);
423                 } else {
424                         ipoib_warn(priv, "multicast join failed for "
425                                    IPOIB_GID_FMT ", status %d\n",
426                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
427                                    status);
428                 }
429         }
430
431         mcast->backoff *= 2;
432         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
433                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
434
435         mcast->query = NULL;
436
437         mutex_lock(&mcast_mutex);
438         if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
439                 if (status == -ETIMEDOUT)
440                         queue_work(ipoib_workqueue, &priv->mcast_task);
441                 else
442                         queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
443                                            mcast->backoff * HZ);
444         } else
445                 complete(&mcast->done);
446         mutex_unlock(&mcast_mutex);
447
448         return;
449 }
450
451 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
452                              int create)
453 {
454         struct ipoib_dev_priv *priv = netdev_priv(dev);
455         struct ib_sa_mcmember_rec rec = {
456                 .join_state = 1
457         };
458         ib_sa_comp_mask comp_mask;
459         int ret = 0;
460
461         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
462                         IPOIB_GID_ARG(mcast->mcmember.mgid));
463
464         rec.mgid     = mcast->mcmember.mgid;
465         rec.port_gid = priv->local_gid;
466         rec.pkey     = cpu_to_be16(priv->pkey);
467
468         comp_mask =
469                 IB_SA_MCMEMBER_REC_MGID         |
470                 IB_SA_MCMEMBER_REC_PORT_GID     |
471                 IB_SA_MCMEMBER_REC_PKEY         |
472                 IB_SA_MCMEMBER_REC_JOIN_STATE;
473
474         if (create) {
475                 comp_mask |=
476                         IB_SA_MCMEMBER_REC_QKEY         |
477                         IB_SA_MCMEMBER_REC_SL           |
478                         IB_SA_MCMEMBER_REC_FLOW_LABEL   |
479                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
480
481                 rec.qkey          = priv->broadcast->mcmember.qkey;
482                 rec.sl            = priv->broadcast->mcmember.sl;
483                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
484                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
485         }
486
487         init_completion(&mcast->done);
488
489         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec, comp_mask,
490                                      mcast->backoff * 1000, GFP_ATOMIC,
491                                      ipoib_mcast_join_complete,
492                                      mcast, &mcast->query);
493
494         if (ret < 0) {
495                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
496
497                 mcast->backoff *= 2;
498                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
499                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
500
501                 mutex_lock(&mcast_mutex);
502                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
503                         queue_delayed_work(ipoib_workqueue,
504                                            &priv->mcast_task,
505                                            mcast->backoff * HZ);
506                 mutex_unlock(&mcast_mutex);
507         } else
508                 mcast->query_id = ret;
509 }
510
511 void ipoib_mcast_join_task(void *dev_ptr)
512 {
513         struct net_device *dev = dev_ptr;
514         struct ipoib_dev_priv *priv = netdev_priv(dev);
515
516         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
517                 return;
518
519         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
520                 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
521         else
522                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
523
524         {
525                 struct ib_port_attr attr;
526
527                 if (!ib_query_port(priv->ca, priv->port, &attr)) {
528                         priv->local_lid  = attr.lid;
529                         priv->local_rate = attr.active_speed *
530                                 ib_width_enum_to_int(attr.active_width);
531                 } else
532                         ipoib_warn(priv, "ib_query_port failed\n");
533         }
534
535         if (!priv->broadcast) {
536                 struct ipoib_mcast *broadcast;
537
538                 broadcast = ipoib_mcast_alloc(dev, 1);
539                 if (!broadcast) {
540                         ipoib_warn(priv, "failed to allocate broadcast group\n");
541                         mutex_lock(&mcast_mutex);
542                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
543                                 queue_delayed_work(ipoib_workqueue,
544                                                    &priv->mcast_task, HZ);
545                         mutex_unlock(&mcast_mutex);
546                         return;
547                 }
548
549                 spin_lock_irq(&priv->lock);
550                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
551                        sizeof (union ib_gid));
552                 priv->broadcast = broadcast;
553
554                 __ipoib_mcast_add(dev, priv->broadcast);
555                 spin_unlock_irq(&priv->lock);
556         }
557
558         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
559                 ipoib_mcast_join(dev, priv->broadcast, 0);
560                 return;
561         }
562
563         while (1) {
564                 struct ipoib_mcast *mcast = NULL;
565
566                 spin_lock_irq(&priv->lock);
567                 list_for_each_entry(mcast, &priv->multicast_list, list) {
568                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
569                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
570                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
571                                 /* Found the next unjoined group */
572                                 break;
573                         }
574                 }
575                 spin_unlock_irq(&priv->lock);
576
577                 if (&mcast->list == &priv->multicast_list) {
578                         /* All done */
579                         break;
580                 }
581
582                 ipoib_mcast_join(dev, mcast, 1);
583                 return;
584         }
585
586         priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
587                 IPOIB_ENCAP_LEN;
588         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
589
590         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
591
592         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
593         netif_carrier_on(dev);
594 }
595
596 int ipoib_mcast_start_thread(struct net_device *dev)
597 {
598         struct ipoib_dev_priv *priv = netdev_priv(dev);
599
600         ipoib_dbg_mcast(priv, "starting multicast thread\n");
601
602         mutex_lock(&mcast_mutex);
603         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
604                 queue_work(ipoib_workqueue, &priv->mcast_task);
605         mutex_unlock(&mcast_mutex);
606
607         spin_lock_irq(&priv->lock);
608         set_bit(IPOIB_MCAST_STARTED, &priv->flags);
609         spin_unlock_irq(&priv->lock);
610
611         return 0;
612 }
613
614 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
615 {
616         struct ipoib_dev_priv *priv = netdev_priv(dev);
617         struct ipoib_mcast *mcast;
618
619         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
620
621         spin_lock_irq(&priv->lock);
622         clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
623         spin_unlock_irq(&priv->lock);
624
625         mutex_lock(&mcast_mutex);
626         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
627         cancel_delayed_work(&priv->mcast_task);
628         mutex_unlock(&mcast_mutex);
629
630         if (flush)
631                 flush_workqueue(ipoib_workqueue);
632
633         if (priv->broadcast && priv->broadcast->query) {
634                 ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
635                 priv->broadcast->query = NULL;
636                 ipoib_dbg_mcast(priv, "waiting for bcast\n");
637                 wait_for_completion(&priv->broadcast->done);
638         }
639
640         list_for_each_entry(mcast, &priv->multicast_list, list) {
641                 if (mcast->query) {
642                         ib_sa_cancel_query(mcast->query_id, mcast->query);
643                         mcast->query = NULL;
644                         ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
645                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
646                         wait_for_completion(&mcast->done);
647                 }
648         }
649
650         return 0;
651 }
652
653 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
654 {
655         struct ipoib_dev_priv *priv = netdev_priv(dev);
656         struct ib_sa_mcmember_rec rec = {
657                 .join_state = 1
658         };
659         int ret = 0;
660
661         if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
662                 return 0;
663
664         ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
665                         IPOIB_GID_ARG(mcast->mcmember.mgid));
666
667         rec.mgid     = mcast->mcmember.mgid;
668         rec.port_gid = priv->local_gid;
669         rec.pkey     = cpu_to_be16(priv->pkey);
670
671         /* Remove ourselves from the multicast group */
672         ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
673                                  &mcast->mcmember.mgid);
674         if (ret)
675                 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
676
677         /*
678          * Just make one shot at leaving and don't wait for a reply;
679          * if we fail, too bad.
680          */
681         ret = ib_sa_mcmember_rec_delete(priv->ca, priv->port, &rec,
682                                         IB_SA_MCMEMBER_REC_MGID         |
683                                         IB_SA_MCMEMBER_REC_PORT_GID     |
684                                         IB_SA_MCMEMBER_REC_PKEY         |
685                                         IB_SA_MCMEMBER_REC_JOIN_STATE,
686                                         0, GFP_ATOMIC, NULL,
687                                         mcast, &mcast->query);
688         if (ret < 0)
689                 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
690                            "for leave (result = %d)\n", ret);
691
692         return 0;
693 }
694
695 void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
696                       struct sk_buff *skb)
697 {
698         struct ipoib_dev_priv *priv = netdev_priv(dev);
699         struct ipoib_mcast *mcast;
700
701         /*
702          * We can only be called from ipoib_start_xmit, so we're
703          * inside tx_lock -- no need to save/restore flags.
704          */
705         spin_lock(&priv->lock);
706
707         if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags)        ||
708             !priv->broadcast                                    ||
709             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
710                 ++priv->stats.tx_dropped;
711                 dev_kfree_skb_any(skb);
712                 goto unlock;
713         }
714
715         mcast = __ipoib_mcast_find(dev, mgid);
716         if (!mcast) {
717                 /* Let's create a new send only group now */
718                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
719                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
720
721                 mcast = ipoib_mcast_alloc(dev, 0);
722                 if (!mcast) {
723                         ipoib_warn(priv, "unable to allocate memory for "
724                                    "multicast structure\n");
725                         ++priv->stats.tx_dropped;
726                         dev_kfree_skb_any(skb);
727                         goto out;
728                 }
729
730                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
731                 mcast->mcmember.mgid = *mgid;
732                 __ipoib_mcast_add(dev, mcast);
733                 list_add_tail(&mcast->list, &priv->multicast_list);
734         }
735
736         if (!mcast->ah) {
737                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
738                         skb_queue_tail(&mcast->pkt_queue, skb);
739                 else {
740                         ++priv->stats.tx_dropped;
741                         dev_kfree_skb_any(skb);
742                 }
743
744                 if (mcast->query)
745                         ipoib_dbg_mcast(priv, "no address vector, "
746                                         "but multicast join already started\n");
747                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
748                         ipoib_mcast_sendonly_join(mcast);
749
750                 /*
751                  * If lookup completes between here and out:, don't
752                  * want to send packet twice.
753                  */
754                 mcast = NULL;
755         }
756
757 out:
758         if (mcast && mcast->ah) {
759                 if (skb->dst            &&
760                     skb->dst->neighbour &&
761                     !*to_ipoib_neigh(skb->dst->neighbour)) {
762                         struct ipoib_neigh *neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
763
764                         if (neigh) {
765                                 kref_get(&mcast->ah->ref);
766                                 neigh->ah       = mcast->ah;
767                                 neigh->neighbour = skb->dst->neighbour;
768                                 *to_ipoib_neigh(skb->dst->neighbour) = neigh;
769                                 list_add_tail(&neigh->list, &mcast->neigh_list);
770                         }
771                 }
772
773                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
774         }
775
776 unlock:
777         spin_unlock(&priv->lock);
778 }
779
780 void ipoib_mcast_dev_flush(struct net_device *dev)
781 {
782         struct ipoib_dev_priv *priv = netdev_priv(dev);
783         LIST_HEAD(remove_list);
784         struct ipoib_mcast *mcast, *tmcast;
785         unsigned long flags;
786
787         ipoib_dbg_mcast(priv, "flushing multicast list\n");
788
789         spin_lock_irqsave(&priv->lock, flags);
790
791         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
792                 list_del(&mcast->list);
793                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
794                 list_add_tail(&mcast->list, &remove_list);
795         }
796
797         if (priv->broadcast) {
798                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
799                 list_add_tail(&priv->broadcast->list, &remove_list);
800                 priv->broadcast = NULL;
801         }
802
803         spin_unlock_irqrestore(&priv->lock, flags);
804
805         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
806                 ipoib_mcast_leave(dev, mcast);
807                 ipoib_mcast_free(mcast);
808         }
809 }
810
811 void ipoib_mcast_restart_task(void *dev_ptr)
812 {
813         struct net_device *dev = dev_ptr;
814         struct ipoib_dev_priv *priv = netdev_priv(dev);
815         struct dev_mc_list *mclist;
816         struct ipoib_mcast *mcast, *tmcast;
817         LIST_HEAD(remove_list);
818         unsigned long flags;
819
820         ipoib_dbg_mcast(priv, "restarting multicast task\n");
821
822         ipoib_mcast_stop_thread(dev, 0);
823
824         spin_lock_irqsave(&dev->xmit_lock, flags);
825         spin_lock(&priv->lock);
826
827         /*
828          * Unfortunately, the networking core only gives us a list of all of
829          * the multicast hardware addresses. We need to figure out which ones
830          * are new and which ones have been removed
831          */
832
833         /* Clear out the found flag */
834         list_for_each_entry(mcast, &priv->multicast_list, list)
835                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
836
837         /* Mark all of the entries that are found or don't exist */
838         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
839                 union ib_gid mgid;
840
841                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
842
843                 /* Add in the P_Key */
844                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
845                 mgid.raw[5] = priv->pkey & 0xff;
846
847                 mcast = __ipoib_mcast_find(dev, &mgid);
848                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
849                         struct ipoib_mcast *nmcast;
850
851                         /* Not found or send-only group, let's add a new entry */
852                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
853                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
854
855                         nmcast = ipoib_mcast_alloc(dev, 0);
856                         if (!nmcast) {
857                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
858                                 continue;
859                         }
860
861                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
862
863                         nmcast->mcmember.mgid = mgid;
864
865                         if (mcast) {
866                                 /* Destroy the send only entry */
867                                 list_del(&mcast->list);
868                                 list_add_tail(&mcast->list, &remove_list);
869
870                                 rb_replace_node(&mcast->rb_node,
871                                                 &nmcast->rb_node,
872                                                 &priv->multicast_tree);
873                         } else
874                                 __ipoib_mcast_add(dev, nmcast);
875
876                         list_add_tail(&nmcast->list, &priv->multicast_list);
877                 }
878
879                 if (mcast)
880                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
881         }
882
883         /* Remove all of the entries don't exist anymore */
884         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
885                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
886                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
887                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
888                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
889
890                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
891
892                         /* Move to the remove list */
893                         list_del(&mcast->list);
894                         list_add_tail(&mcast->list, &remove_list);
895                 }
896         }
897
898         spin_unlock(&priv->lock);
899         spin_unlock_irqrestore(&dev->xmit_lock, flags);
900
901         /* We have to cancel outside of the spinlock */
902         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
903                 ipoib_mcast_leave(mcast->dev, mcast);
904                 ipoib_mcast_free(mcast);
905         }
906
907         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
908                 ipoib_mcast_start_thread(dev);
909 }
910
911 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
912
913 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
914 {
915         struct ipoib_mcast_iter *iter;
916
917         iter = kmalloc(sizeof *iter, GFP_KERNEL);
918         if (!iter)
919                 return NULL;
920
921         iter->dev = dev;
922         memset(iter->mgid.raw, 0, 16);
923
924         if (ipoib_mcast_iter_next(iter)) {
925                 kfree(iter);
926                 return NULL;
927         }
928
929         return iter;
930 }
931
932 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
933 {
934         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
935         struct rb_node *n;
936         struct ipoib_mcast *mcast;
937         int ret = 1;
938
939         spin_lock_irq(&priv->lock);
940
941         n = rb_first(&priv->multicast_tree);
942
943         while (n) {
944                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
945
946                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
947                            sizeof (union ib_gid)) < 0) {
948                         iter->mgid      = mcast->mcmember.mgid;
949                         iter->created   = mcast->created;
950                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
951                         iter->complete  = !!mcast->ah;
952                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
953
954                         ret = 0;
955
956                         break;
957                 }
958
959                 n = rb_next(n);
960         }
961
962         spin_unlock_irq(&priv->lock);
963
964         return ret;
965 }
966
967 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
968                            union ib_gid *mgid,
969                            unsigned long *created,
970                            unsigned int *queuelen,
971                            unsigned int *complete,
972                            unsigned int *send_only)
973 {
974         *mgid      = iter->mgid;
975         *created   = iter->created;
976         *queuelen  = iter->queuelen;
977         *complete  = iter->complete;
978         *send_only = iter->send_only;
979 }
980
981 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */