Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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 #include <linux/slab.h>
44
45 #include <net/dst.h>
46
47 #include "ipoib.h"
48
49 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
50 static int mcast_debug_level;
51
52 module_param(mcast_debug_level, int, 0644);
53 MODULE_PARM_DESC(mcast_debug_level,
54                  "Enable multicast debug tracing if > 0");
55 #endif
56
57 static DEFINE_MUTEX(mcast_mutex);
58
59 struct ipoib_mcast_iter {
60         struct net_device *dev;
61         union ib_gid       mgid;
62         unsigned long      created;
63         unsigned int       queuelen;
64         unsigned int       complete;
65         unsigned int       send_only;
66 };
67
68 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
69 {
70         struct net_device *dev = mcast->dev;
71         struct ipoib_dev_priv *priv = netdev_priv(dev);
72         struct ipoib_neigh *neigh, *tmp;
73         int tx_dropped = 0;
74
75         ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
76                         mcast->mcmember.mgid.raw);
77
78         spin_lock_irq(&priv->lock);
79
80         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
81                 /*
82                  * It's safe to call ipoib_put_ah() inside priv->lock
83                  * here, because we know that mcast->ah will always
84                  * hold one more reference, so ipoib_put_ah() will
85                  * never do more than decrement the ref count.
86                  */
87                 if (neigh->ah)
88                         ipoib_put_ah(neigh->ah);
89                 ipoib_neigh_free(dev, neigh);
90         }
91
92         spin_unlock_irq(&priv->lock);
93
94         if (mcast->ah)
95                 ipoib_put_ah(mcast->ah);
96
97         while (!skb_queue_empty(&mcast->pkt_queue)) {
98                 ++tx_dropped;
99                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
100         }
101
102         netif_tx_lock_bh(dev);
103         dev->stats.tx_dropped += tx_dropped;
104         netif_tx_unlock_bh(dev);
105
106         kfree(mcast);
107 }
108
109 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
110                                              int can_sleep)
111 {
112         struct ipoib_mcast *mcast;
113
114         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
115         if (!mcast)
116                 return NULL;
117
118         mcast->dev = dev;
119         mcast->created = jiffies;
120         mcast->backoff = 1;
121
122         INIT_LIST_HEAD(&mcast->list);
123         INIT_LIST_HEAD(&mcast->neigh_list);
124         skb_queue_head_init(&mcast->pkt_queue);
125
126         return mcast;
127 }
128
129 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
130 {
131         struct ipoib_dev_priv *priv = netdev_priv(dev);
132         struct rb_node *n = priv->multicast_tree.rb_node;
133
134         while (n) {
135                 struct ipoib_mcast *mcast;
136                 int ret;
137
138                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
139
140                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
141                              sizeof (union ib_gid));
142                 if (ret < 0)
143                         n = n->rb_left;
144                 else if (ret > 0)
145                         n = n->rb_right;
146                 else
147                         return mcast;
148         }
149
150         return NULL;
151 }
152
153 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
154 {
155         struct ipoib_dev_priv *priv = netdev_priv(dev);
156         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
157
158         while (*n) {
159                 struct ipoib_mcast *tmcast;
160                 int ret;
161
162                 pn = *n;
163                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
164
165                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
166                              sizeof (union ib_gid));
167                 if (ret < 0)
168                         n = &pn->rb_left;
169                 else if (ret > 0)
170                         n = &pn->rb_right;
171                 else
172                         return -EEXIST;
173         }
174
175         rb_link_node(&mcast->rb_node, pn, n);
176         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
177
178         return 0;
179 }
180
181 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
182                                    struct ib_sa_mcmember_rec *mcmember)
183 {
184         struct net_device *dev = mcast->dev;
185         struct ipoib_dev_priv *priv = netdev_priv(dev);
186         struct ipoib_ah *ah;
187         int ret;
188         int set_qkey = 0;
189
190         mcast->mcmember = *mcmember;
191
192         /* Set the cached Q_Key before we attach if it's the broadcast group */
193         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
194                     sizeof (union ib_gid))) {
195                 spin_lock_irq(&priv->lock);
196                 if (!priv->broadcast) {
197                         spin_unlock_irq(&priv->lock);
198                         return -EAGAIN;
199                 }
200                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
201                 spin_unlock_irq(&priv->lock);
202                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
203                 set_qkey = 1;
204         }
205
206         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
207                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
208                         ipoib_warn(priv, "multicast group %pI6 already attached\n",
209                                    mcast->mcmember.mgid.raw);
210
211                         return 0;
212                 }
213
214                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
215                                          &mcast->mcmember.mgid, set_qkey);
216                 if (ret < 0) {
217                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
218                                    mcast->mcmember.mgid.raw);
219
220                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
221                         return ret;
222                 }
223         }
224
225         {
226                 struct ib_ah_attr av = {
227                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
228                         .port_num      = priv->port,
229                         .sl            = mcast->mcmember.sl,
230                         .ah_flags      = IB_AH_GRH,
231                         .static_rate   = mcast->mcmember.rate,
232                         .grh           = {
233                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
234                                 .hop_limit     = mcast->mcmember.hop_limit,
235                                 .sgid_index    = 0,
236                                 .traffic_class = mcast->mcmember.traffic_class
237                         }
238                 };
239                 av.grh.dgid = mcast->mcmember.mgid;
240
241                 ah = ipoib_create_ah(dev, priv->pd, &av);
242                 if (!ah) {
243                         ipoib_warn(priv, "ib_address_create failed\n");
244                 } else {
245                         spin_lock_irq(&priv->lock);
246                         mcast->ah = ah;
247                         spin_unlock_irq(&priv->lock);
248
249                         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
250                                         mcast->mcmember.mgid.raw,
251                                         mcast->ah->ah,
252                                         be16_to_cpu(mcast->mcmember.mlid),
253                                         mcast->mcmember.sl);
254                 }
255         }
256
257         /* actually send any queued packets */
258         netif_tx_lock_bh(dev);
259         while (!skb_queue_empty(&mcast->pkt_queue)) {
260                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
261                 netif_tx_unlock_bh(dev);
262
263                 skb->dev = dev;
264
265                 if (!skb_dst(skb) || !skb_dst(skb)->neighbour) {
266                         /* put pseudoheader back on for next time */
267                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
268                 }
269
270                 if (dev_queue_xmit(skb))
271                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
272                 netif_tx_lock_bh(dev);
273         }
274         netif_tx_unlock_bh(dev);
275
276         return 0;
277 }
278
279 static int
280 ipoib_mcast_sendonly_join_complete(int status,
281                                    struct ib_sa_multicast *multicast)
282 {
283         struct ipoib_mcast *mcast = multicast->context;
284         struct net_device *dev = mcast->dev;
285
286         /* We trap for port events ourselves. */
287         if (status == -ENETRESET)
288                 return 0;
289
290         if (!status)
291                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
292
293         if (status) {
294                 if (mcast->logcount++ < 20)
295                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n",
296                                         mcast->mcmember.mgid.raw, status);
297
298                 /* Flush out any queued packets */
299                 netif_tx_lock_bh(dev);
300                 while (!skb_queue_empty(&mcast->pkt_queue)) {
301                         ++dev->stats.tx_dropped;
302                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
303                 }
304                 netif_tx_unlock_bh(dev);
305
306                 /* Clear the busy flag so we try again */
307                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
308                                             &mcast->flags);
309         }
310         return status;
311 }
312
313 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
314 {
315         struct net_device *dev = mcast->dev;
316         struct ipoib_dev_priv *priv = netdev_priv(dev);
317         struct ib_sa_mcmember_rec rec = {
318 #if 0                           /* Some SMs don't support send-only yet */
319                 .join_state = 4
320 #else
321                 .join_state = 1
322 #endif
323         };
324         int ret = 0;
325
326         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
327                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
328                 return -ENODEV;
329         }
330
331         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
332                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
333                 return -EBUSY;
334         }
335
336         rec.mgid     = mcast->mcmember.mgid;
337         rec.port_gid = priv->local_gid;
338         rec.pkey     = cpu_to_be16(priv->pkey);
339
340         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
341                                          priv->port, &rec,
342                                          IB_SA_MCMEMBER_REC_MGID        |
343                                          IB_SA_MCMEMBER_REC_PORT_GID    |
344                                          IB_SA_MCMEMBER_REC_PKEY        |
345                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
346                                          GFP_ATOMIC,
347                                          ipoib_mcast_sendonly_join_complete,
348                                          mcast);
349         if (IS_ERR(mcast->mc)) {
350                 ret = PTR_ERR(mcast->mc);
351                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
352                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
353                            ret);
354         } else {
355                 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n",
356                                 mcast->mcmember.mgid.raw);
357         }
358
359         return ret;
360 }
361
362 void ipoib_mcast_carrier_on_task(struct work_struct *work)
363 {
364         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
365                                                    carrier_on_task);
366         struct ib_port_attr attr;
367
368         /*
369          * Take rtnl_lock to avoid racing with ipoib_stop() and
370          * turning the carrier back on while a device is being
371          * removed.
372          */
373         if (ib_query_port(priv->ca, priv->port, &attr) ||
374             attr.state != IB_PORT_ACTIVE) {
375                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
376                 return;
377         }
378
379         rtnl_lock();
380         netif_carrier_on(priv->dev);
381         rtnl_unlock();
382 }
383
384 static int ipoib_mcast_join_complete(int status,
385                                      struct ib_sa_multicast *multicast)
386 {
387         struct ipoib_mcast *mcast = multicast->context;
388         struct net_device *dev = mcast->dev;
389         struct ipoib_dev_priv *priv = netdev_priv(dev);
390
391         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
392                         mcast->mcmember.mgid.raw, status);
393
394         /* We trap for port events ourselves. */
395         if (status == -ENETRESET)
396                 return 0;
397
398         if (!status)
399                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
400
401         if (!status) {
402                 mcast->backoff = 1;
403                 mutex_lock(&mcast_mutex);
404                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
405                         queue_delayed_work(ipoib_workqueue,
406                                            &priv->mcast_task, 0);
407                 mutex_unlock(&mcast_mutex);
408
409                 /*
410                  * Defer carrier on work to ipoib_workqueue to avoid a
411                  * deadlock on rtnl_lock here.
412                  */
413                 if (mcast == priv->broadcast)
414                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
415
416                 return 0;
417         }
418
419         if (mcast->logcount++ < 20) {
420                 if (status == -ETIMEDOUT || status == -EAGAIN) {
421                         ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
422                                         mcast->mcmember.mgid.raw, status);
423                 } else {
424                         ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
425                                    mcast->mcmember.mgid.raw, status);
426                 }
427         }
428
429         mcast->backoff *= 2;
430         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
431                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
432
433         /* Clear the busy flag so we try again */
434         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
435
436         mutex_lock(&mcast_mutex);
437         spin_lock_irq(&priv->lock);
438         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
439                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
440                                    mcast->backoff * HZ);
441         spin_unlock_irq(&priv->lock);
442         mutex_unlock(&mcast_mutex);
443
444         return status;
445 }
446
447 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
448                              int create)
449 {
450         struct ipoib_dev_priv *priv = netdev_priv(dev);
451         struct ib_sa_mcmember_rec rec = {
452                 .join_state = 1
453         };
454         ib_sa_comp_mask comp_mask;
455         int ret = 0;
456
457         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
458
459         rec.mgid     = mcast->mcmember.mgid;
460         rec.port_gid = priv->local_gid;
461         rec.pkey     = cpu_to_be16(priv->pkey);
462
463         comp_mask =
464                 IB_SA_MCMEMBER_REC_MGID         |
465                 IB_SA_MCMEMBER_REC_PORT_GID     |
466                 IB_SA_MCMEMBER_REC_PKEY         |
467                 IB_SA_MCMEMBER_REC_JOIN_STATE;
468
469         if (create) {
470                 comp_mask |=
471                         IB_SA_MCMEMBER_REC_QKEY                 |
472                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
473                         IB_SA_MCMEMBER_REC_MTU                  |
474                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
475                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
476                         IB_SA_MCMEMBER_REC_RATE                 |
477                         IB_SA_MCMEMBER_REC_SL                   |
478                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
479                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
480
481                 rec.qkey          = priv->broadcast->mcmember.qkey;
482                 rec.mtu_selector  = IB_SA_EQ;
483                 rec.mtu           = priv->broadcast->mcmember.mtu;
484                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
485                 rec.rate_selector = IB_SA_EQ;
486                 rec.rate          = priv->broadcast->mcmember.rate;
487                 rec.sl            = priv->broadcast->mcmember.sl;
488                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
489                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
490         }
491
492         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
493         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
494                                          &rec, comp_mask, GFP_KERNEL,
495                                          ipoib_mcast_join_complete, mcast);
496         if (IS_ERR(mcast->mc)) {
497                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
498                 ret = PTR_ERR(mcast->mc);
499                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
500
501                 mcast->backoff *= 2;
502                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
503                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
504
505                 mutex_lock(&mcast_mutex);
506                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
507                         queue_delayed_work(ipoib_workqueue,
508                                            &priv->mcast_task,
509                                            mcast->backoff * HZ);
510                 mutex_unlock(&mcast_mutex);
511         }
512 }
513
514 void ipoib_mcast_join_task(struct work_struct *work)
515 {
516         struct ipoib_dev_priv *priv =
517                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
518         struct net_device *dev = priv->dev;
519
520         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
521                 return;
522
523         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
524                 ipoib_warn(priv, "ib_query_gid() failed\n");
525         else
526                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
527
528         {
529                 struct ib_port_attr attr;
530
531                 if (!ib_query_port(priv->ca, priv->port, &attr))
532                         priv->local_lid = attr.lid;
533                 else
534                         ipoib_warn(priv, "ib_query_port failed\n");
535         }
536
537         if (!priv->broadcast) {
538                 struct ipoib_mcast *broadcast;
539
540                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
541                         return;
542
543                 broadcast = ipoib_mcast_alloc(dev, 1);
544                 if (!broadcast) {
545                         ipoib_warn(priv, "failed to allocate broadcast group\n");
546                         mutex_lock(&mcast_mutex);
547                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
548                                 queue_delayed_work(ipoib_workqueue,
549                                                    &priv->mcast_task, HZ);
550                         mutex_unlock(&mcast_mutex);
551                         return;
552                 }
553
554                 spin_lock_irq(&priv->lock);
555                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
556                        sizeof (union ib_gid));
557                 priv->broadcast = broadcast;
558
559                 __ipoib_mcast_add(dev, priv->broadcast);
560                 spin_unlock_irq(&priv->lock);
561         }
562
563         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
564                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
565                         ipoib_mcast_join(dev, priv->broadcast, 0);
566                 return;
567         }
568
569         while (1) {
570                 struct ipoib_mcast *mcast = NULL;
571
572                 spin_lock_irq(&priv->lock);
573                 list_for_each_entry(mcast, &priv->multicast_list, list) {
574                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
575                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
576                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
577                                 /* Found the next unjoined group */
578                                 break;
579                         }
580                 }
581                 spin_unlock_irq(&priv->lock);
582
583                 if (&mcast->list == &priv->multicast_list) {
584                         /* All done */
585                         break;
586                 }
587
588                 ipoib_mcast_join(dev, mcast, 1);
589                 return;
590         }
591
592         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
593
594         if (!ipoib_cm_admin_enabled(dev)) {
595                 rtnl_lock();
596                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
597                 rtnl_unlock();
598         }
599
600         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
601
602         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
603 }
604
605 int ipoib_mcast_start_thread(struct net_device *dev)
606 {
607         struct ipoib_dev_priv *priv = netdev_priv(dev);
608
609         ipoib_dbg_mcast(priv, "starting multicast thread\n");
610
611         mutex_lock(&mcast_mutex);
612         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
613                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
614         mutex_unlock(&mcast_mutex);
615
616         return 0;
617 }
618
619 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
620 {
621         struct ipoib_dev_priv *priv = netdev_priv(dev);
622
623         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
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         return 0;
634 }
635
636 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
637 {
638         struct ipoib_dev_priv *priv = netdev_priv(dev);
639         int ret = 0;
640
641         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
642                 ib_sa_free_multicast(mcast->mc);
643
644         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
645                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
646                                 mcast->mcmember.mgid.raw);
647
648                 /* Remove ourselves from the multicast group */
649                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
650                                       be16_to_cpu(mcast->mcmember.mlid));
651                 if (ret)
652                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
653         }
654
655         return 0;
656 }
657
658 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
659 {
660         struct ipoib_dev_priv *priv = netdev_priv(dev);
661         struct ipoib_mcast *mcast;
662         unsigned long flags;
663
664         spin_lock_irqsave(&priv->lock, flags);
665
666         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
667             !priv->broadcast                                    ||
668             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
669                 ++dev->stats.tx_dropped;
670                 dev_kfree_skb_any(skb);
671                 goto unlock;
672         }
673
674         mcast = __ipoib_mcast_find(dev, mgid);
675         if (!mcast) {
676                 /* Let's create a new send only group now */
677                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
678                                 mgid);
679
680                 mcast = ipoib_mcast_alloc(dev, 0);
681                 if (!mcast) {
682                         ipoib_warn(priv, "unable to allocate memory for "
683                                    "multicast structure\n");
684                         ++dev->stats.tx_dropped;
685                         dev_kfree_skb_any(skb);
686                         goto out;
687                 }
688
689                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
690                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
691                 __ipoib_mcast_add(dev, mcast);
692                 list_add_tail(&mcast->list, &priv->multicast_list);
693         }
694
695         if (!mcast->ah) {
696                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
697                         skb_queue_tail(&mcast->pkt_queue, skb);
698                 else {
699                         ++dev->stats.tx_dropped;
700                         dev_kfree_skb_any(skb);
701                 }
702
703                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
704                         ipoib_dbg_mcast(priv, "no address vector, "
705                                         "but multicast join already started\n");
706                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
707                         ipoib_mcast_sendonly_join(mcast);
708
709                 /*
710                  * If lookup completes between here and out:, don't
711                  * want to send packet twice.
712                  */
713                 mcast = NULL;
714         }
715
716 out:
717         if (mcast && mcast->ah) {
718                 if (skb_dst(skb)                &&
719                     skb_dst(skb)->neighbour &&
720                     !*to_ipoib_neigh(skb_dst(skb)->neighbour)) {
721                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb_dst(skb)->neighbour,
722                                                                         skb->dev);
723
724                         if (neigh) {
725                                 kref_get(&mcast->ah->ref);
726                                 neigh->ah       = mcast->ah;
727                                 list_add_tail(&neigh->list, &mcast->neigh_list);
728                         }
729                 }
730
731                 spin_unlock_irqrestore(&priv->lock, flags);
732                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
733                 return;
734         }
735
736 unlock:
737         spin_unlock_irqrestore(&priv->lock, flags);
738 }
739
740 void ipoib_mcast_dev_flush(struct net_device *dev)
741 {
742         struct ipoib_dev_priv *priv = netdev_priv(dev);
743         LIST_HEAD(remove_list);
744         struct ipoib_mcast *mcast, *tmcast;
745         unsigned long flags;
746
747         ipoib_dbg_mcast(priv, "flushing multicast list\n");
748
749         spin_lock_irqsave(&priv->lock, flags);
750
751         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
752                 list_del(&mcast->list);
753                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
754                 list_add_tail(&mcast->list, &remove_list);
755         }
756
757         if (priv->broadcast) {
758                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
759                 list_add_tail(&priv->broadcast->list, &remove_list);
760                 priv->broadcast = NULL;
761         }
762
763         spin_unlock_irqrestore(&priv->lock, flags);
764
765         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
766                 ipoib_mcast_leave(dev, mcast);
767                 ipoib_mcast_free(mcast);
768         }
769 }
770
771 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
772 {
773         /* reserved QPN, prefix, scope */
774         if (memcmp(addr, broadcast, 6))
775                 return 0;
776         /* signature lower, pkey */
777         if (memcmp(addr + 7, broadcast + 7, 3))
778                 return 0;
779         return 1;
780 }
781
782 void ipoib_mcast_restart_task(struct work_struct *work)
783 {
784         struct ipoib_dev_priv *priv =
785                 container_of(work, struct ipoib_dev_priv, restart_task);
786         struct net_device *dev = priv->dev;
787         struct netdev_hw_addr *ha;
788         struct ipoib_mcast *mcast, *tmcast;
789         LIST_HEAD(remove_list);
790         unsigned long flags;
791         struct ib_sa_mcmember_rec rec;
792
793         ipoib_dbg_mcast(priv, "restarting multicast task\n");
794
795         ipoib_mcast_stop_thread(dev, 0);
796
797         local_irq_save(flags);
798         netif_addr_lock(dev);
799         spin_lock(&priv->lock);
800
801         /*
802          * Unfortunately, the networking core only gives us a list of all of
803          * the multicast hardware addresses. We need to figure out which ones
804          * are new and which ones have been removed
805          */
806
807         /* Clear out the found flag */
808         list_for_each_entry(mcast, &priv->multicast_list, list)
809                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
810
811         /* Mark all of the entries that are found or don't exist */
812         netdev_for_each_mc_addr(ha, dev) {
813                 union ib_gid mgid;
814
815                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
816                         continue;
817
818                 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
819
820                 mcast = __ipoib_mcast_find(dev, &mgid);
821                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
822                         struct ipoib_mcast *nmcast;
823
824                         /* ignore group which is directly joined by userspace */
825                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
826                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
827                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
828                                                 mgid.raw);
829                                 continue;
830                         }
831
832                         /* Not found or send-only group, let's add a new entry */
833                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
834                                         mgid.raw);
835
836                         nmcast = ipoib_mcast_alloc(dev, 0);
837                         if (!nmcast) {
838                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
839                                 continue;
840                         }
841
842                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
843
844                         nmcast->mcmember.mgid = mgid;
845
846                         if (mcast) {
847                                 /* Destroy the send only entry */
848                                 list_move_tail(&mcast->list, &remove_list);
849
850                                 rb_replace_node(&mcast->rb_node,
851                                                 &nmcast->rb_node,
852                                                 &priv->multicast_tree);
853                         } else
854                                 __ipoib_mcast_add(dev, nmcast);
855
856                         list_add_tail(&nmcast->list, &priv->multicast_list);
857                 }
858
859                 if (mcast)
860                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
861         }
862
863         /* Remove all of the entries don't exist anymore */
864         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
865                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
866                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
867                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
868                                         mcast->mcmember.mgid.raw);
869
870                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
871
872                         /* Move to the remove list */
873                         list_move_tail(&mcast->list, &remove_list);
874                 }
875         }
876
877         spin_unlock(&priv->lock);
878         netif_addr_unlock(dev);
879         local_irq_restore(flags);
880
881         /* We have to cancel outside of the spinlock */
882         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
883                 ipoib_mcast_leave(mcast->dev, mcast);
884                 ipoib_mcast_free(mcast);
885         }
886
887         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
888                 ipoib_mcast_start_thread(dev);
889 }
890
891 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
892
893 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
894 {
895         struct ipoib_mcast_iter *iter;
896
897         iter = kmalloc(sizeof *iter, GFP_KERNEL);
898         if (!iter)
899                 return NULL;
900
901         iter->dev = dev;
902         memset(iter->mgid.raw, 0, 16);
903
904         if (ipoib_mcast_iter_next(iter)) {
905                 kfree(iter);
906                 return NULL;
907         }
908
909         return iter;
910 }
911
912 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
913 {
914         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
915         struct rb_node *n;
916         struct ipoib_mcast *mcast;
917         int ret = 1;
918
919         spin_lock_irq(&priv->lock);
920
921         n = rb_first(&priv->multicast_tree);
922
923         while (n) {
924                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
925
926                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
927                            sizeof (union ib_gid)) < 0) {
928                         iter->mgid      = mcast->mcmember.mgid;
929                         iter->created   = mcast->created;
930                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
931                         iter->complete  = !!mcast->ah;
932                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
933
934                         ret = 0;
935
936                         break;
937                 }
938
939                 n = rb_next(n);
940         }
941
942         spin_unlock_irq(&priv->lock);
943
944         return ret;
945 }
946
947 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
948                            union ib_gid *mgid,
949                            unsigned long *created,
950                            unsigned int *queuelen,
951                            unsigned int *complete,
952                            unsigned int *send_only)
953 {
954         *mgid      = iter->mgid;
955         *created   = iter->created;
956         *queuelen  = iter->queuelen;
957         *complete  = iter->complete;
958         *send_only = iter->send_only;
959 }
960
961 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */