c8a0f7dab5b0442ac276a3d19919a338cef9ee47
[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) || !skb_dst(skb)->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         struct ib_port_attr attr;
366
367         /*
368          * Take rtnl_lock to avoid racing with ipoib_stop() and
369          * turning the carrier back on while a device is being
370          * removed.
371          */
372         if (ib_query_port(priv->ca, priv->port, &attr) ||
373             attr.state != IB_PORT_ACTIVE) {
374                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
375                 return;
376         }
377
378         rtnl_lock();
379         netif_carrier_on(priv->dev);
380         rtnl_unlock();
381 }
382
383 static int ipoib_mcast_join_complete(int status,
384                                      struct ib_sa_multicast *multicast)
385 {
386         struct ipoib_mcast *mcast = multicast->context;
387         struct net_device *dev = mcast->dev;
388         struct ipoib_dev_priv *priv = netdev_priv(dev);
389
390         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
391                         mcast->mcmember.mgid.raw, status);
392
393         /* We trap for port events ourselves. */
394         if (status == -ENETRESET)
395                 return 0;
396
397         if (!status)
398                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
399
400         if (!status) {
401                 mcast->backoff = 1;
402                 mutex_lock(&mcast_mutex);
403                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
404                         queue_delayed_work(ipoib_workqueue,
405                                            &priv->mcast_task, 0);
406                 mutex_unlock(&mcast_mutex);
407
408                 /*
409                  * Defer carrier on work to ipoib_workqueue to avoid a
410                  * deadlock on rtnl_lock here.
411                  */
412                 if (mcast == priv->broadcast)
413                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
414
415                 return 0;
416         }
417
418         if (mcast->logcount++ < 20) {
419                 if (status == -ETIMEDOUT || status == -EAGAIN) {
420                         ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
421                                         mcast->mcmember.mgid.raw, status);
422                 } else {
423                         ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
424                                    mcast->mcmember.mgid.raw, status);
425                 }
426         }
427
428         mcast->backoff *= 2;
429         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
430                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
431
432         /* Clear the busy flag so we try again */
433         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
434
435         mutex_lock(&mcast_mutex);
436         spin_lock_irq(&priv->lock);
437         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
438                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
439                                    mcast->backoff * HZ);
440         spin_unlock_irq(&priv->lock);
441         mutex_unlock(&mcast_mutex);
442
443         return status;
444 }
445
446 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
447                              int create)
448 {
449         struct ipoib_dev_priv *priv = netdev_priv(dev);
450         struct ib_sa_mcmember_rec rec = {
451                 .join_state = 1
452         };
453         ib_sa_comp_mask comp_mask;
454         int ret = 0;
455
456         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
457
458         rec.mgid     = mcast->mcmember.mgid;
459         rec.port_gid = priv->local_gid;
460         rec.pkey     = cpu_to_be16(priv->pkey);
461
462         comp_mask =
463                 IB_SA_MCMEMBER_REC_MGID         |
464                 IB_SA_MCMEMBER_REC_PORT_GID     |
465                 IB_SA_MCMEMBER_REC_PKEY         |
466                 IB_SA_MCMEMBER_REC_JOIN_STATE;
467
468         if (create) {
469                 comp_mask |=
470                         IB_SA_MCMEMBER_REC_QKEY                 |
471                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
472                         IB_SA_MCMEMBER_REC_MTU                  |
473                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
474                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
475                         IB_SA_MCMEMBER_REC_RATE                 |
476                         IB_SA_MCMEMBER_REC_SL                   |
477                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
478                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
479
480                 rec.qkey          = priv->broadcast->mcmember.qkey;
481                 rec.mtu_selector  = IB_SA_EQ;
482                 rec.mtu           = priv->broadcast->mcmember.mtu;
483                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
484                 rec.rate_selector = IB_SA_EQ;
485                 rec.rate          = priv->broadcast->mcmember.rate;
486                 rec.sl            = priv->broadcast->mcmember.sl;
487                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
488                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
489         }
490
491         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
492         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
493                                          &rec, comp_mask, GFP_KERNEL,
494                                          ipoib_mcast_join_complete, mcast);
495         if (IS_ERR(mcast->mc)) {
496                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
497                 ret = PTR_ERR(mcast->mc);
498                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
499
500                 mcast->backoff *= 2;
501                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
502                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
503
504                 mutex_lock(&mcast_mutex);
505                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
506                         queue_delayed_work(ipoib_workqueue,
507                                            &priv->mcast_task,
508                                            mcast->backoff * HZ);
509                 mutex_unlock(&mcast_mutex);
510         }
511 }
512
513 void ipoib_mcast_join_task(struct work_struct *work)
514 {
515         struct ipoib_dev_priv *priv =
516                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
517         struct net_device *dev = priv->dev;
518
519         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
520                 return;
521
522         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
523                 ipoib_warn(priv, "ib_query_gid() failed\n");
524         else
525                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
526
527         {
528                 struct ib_port_attr attr;
529
530                 if (!ib_query_port(priv->ca, priv->port, &attr))
531                         priv->local_lid = attr.lid;
532                 else
533                         ipoib_warn(priv, "ib_query_port failed\n");
534         }
535
536         if (!priv->broadcast) {
537                 struct ipoib_mcast *broadcast;
538
539                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
540                         return;
541
542                 broadcast = ipoib_mcast_alloc(dev, 1);
543                 if (!broadcast) {
544                         ipoib_warn(priv, "failed to allocate broadcast group\n");
545                         mutex_lock(&mcast_mutex);
546                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
547                                 queue_delayed_work(ipoib_workqueue,
548                                                    &priv->mcast_task, HZ);
549                         mutex_unlock(&mcast_mutex);
550                         return;
551                 }
552
553                 spin_lock_irq(&priv->lock);
554                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
555                        sizeof (union ib_gid));
556                 priv->broadcast = broadcast;
557
558                 __ipoib_mcast_add(dev, priv->broadcast);
559                 spin_unlock_irq(&priv->lock);
560         }
561
562         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
563                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
564                         ipoib_mcast_join(dev, priv->broadcast, 0);
565                 return;
566         }
567
568         while (1) {
569                 struct ipoib_mcast *mcast = NULL;
570
571                 spin_lock_irq(&priv->lock);
572                 list_for_each_entry(mcast, &priv->multicast_list, list) {
573                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
574                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
575                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
576                                 /* Found the next unjoined group */
577                                 break;
578                         }
579                 }
580                 spin_unlock_irq(&priv->lock);
581
582                 if (&mcast->list == &priv->multicast_list) {
583                         /* All done */
584                         break;
585                 }
586
587                 ipoib_mcast_join(dev, mcast, 1);
588                 return;
589         }
590
591         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
592
593         if (!ipoib_cm_admin_enabled(dev)) {
594                 rtnl_lock();
595                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
596                 rtnl_unlock();
597         }
598
599         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
600
601         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
602 }
603
604 int ipoib_mcast_start_thread(struct net_device *dev)
605 {
606         struct ipoib_dev_priv *priv = netdev_priv(dev);
607
608         ipoib_dbg_mcast(priv, "starting multicast thread\n");
609
610         mutex_lock(&mcast_mutex);
611         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
612                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
613         mutex_unlock(&mcast_mutex);
614
615         return 0;
616 }
617
618 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
619 {
620         struct ipoib_dev_priv *priv = netdev_priv(dev);
621
622         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
623
624         mutex_lock(&mcast_mutex);
625         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
626         cancel_delayed_work(&priv->mcast_task);
627         mutex_unlock(&mcast_mutex);
628
629         if (flush)
630                 flush_workqueue(ipoib_workqueue);
631
632         return 0;
633 }
634
635 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
636 {
637         struct ipoib_dev_priv *priv = netdev_priv(dev);
638         int ret = 0;
639
640         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
641                 ib_sa_free_multicast(mcast->mc);
642
643         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
644                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
645                                 mcast->mcmember.mgid.raw);
646
647                 /* Remove ourselves from the multicast group */
648                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
649                                       be16_to_cpu(mcast->mcmember.mlid));
650                 if (ret)
651                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
652         }
653
654         return 0;
655 }
656
657 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
658 {
659         struct ipoib_dev_priv *priv = netdev_priv(dev);
660         struct ipoib_mcast *mcast;
661         unsigned long flags;
662
663         spin_lock_irqsave(&priv->lock, flags);
664
665         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
666             !priv->broadcast                                    ||
667             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
668                 ++dev->stats.tx_dropped;
669                 dev_kfree_skb_any(skb);
670                 goto unlock;
671         }
672
673         mcast = __ipoib_mcast_find(dev, mgid);
674         if (!mcast) {
675                 /* Let's create a new send only group now */
676                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
677                                 mgid);
678
679                 mcast = ipoib_mcast_alloc(dev, 0);
680                 if (!mcast) {
681                         ipoib_warn(priv, "unable to allocate memory for "
682                                    "multicast structure\n");
683                         ++dev->stats.tx_dropped;
684                         dev_kfree_skb_any(skb);
685                         goto out;
686                 }
687
688                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
689                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
690                 __ipoib_mcast_add(dev, mcast);
691                 list_add_tail(&mcast->list, &priv->multicast_list);
692         }
693
694         if (!mcast->ah) {
695                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
696                         skb_queue_tail(&mcast->pkt_queue, skb);
697                 else {
698                         ++dev->stats.tx_dropped;
699                         dev_kfree_skb_any(skb);
700                 }
701
702                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
703                         ipoib_dbg_mcast(priv, "no address vector, "
704                                         "but multicast join already started\n");
705                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
706                         ipoib_mcast_sendonly_join(mcast);
707
708                 /*
709                  * If lookup completes between here and out:, don't
710                  * want to send packet twice.
711                  */
712                 mcast = NULL;
713         }
714
715 out:
716         if (mcast && mcast->ah) {
717                 if (skb_dst(skb)                &&
718                     skb_dst(skb)->neighbour &&
719                     !*to_ipoib_neigh(skb_dst(skb)->neighbour)) {
720                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb_dst(skb)->neighbour,
721                                                                         skb->dev);
722
723                         if (neigh) {
724                                 kref_get(&mcast->ah->ref);
725                                 neigh->ah       = mcast->ah;
726                                 list_add_tail(&neigh->list, &mcast->neigh_list);
727                         }
728                 }
729
730                 spin_unlock_irqrestore(&priv->lock, flags);
731                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
732                 return;
733         }
734
735 unlock:
736         spin_unlock_irqrestore(&priv->lock, flags);
737 }
738
739 void ipoib_mcast_dev_flush(struct net_device *dev)
740 {
741         struct ipoib_dev_priv *priv = netdev_priv(dev);
742         LIST_HEAD(remove_list);
743         struct ipoib_mcast *mcast, *tmcast;
744         unsigned long flags;
745
746         ipoib_dbg_mcast(priv, "flushing multicast list\n");
747
748         spin_lock_irqsave(&priv->lock, flags);
749
750         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
751                 list_del(&mcast->list);
752                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
753                 list_add_tail(&mcast->list, &remove_list);
754         }
755
756         if (priv->broadcast) {
757                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
758                 list_add_tail(&priv->broadcast->list, &remove_list);
759                 priv->broadcast = NULL;
760         }
761
762         spin_unlock_irqrestore(&priv->lock, flags);
763
764         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
765                 ipoib_mcast_leave(dev, mcast);
766                 ipoib_mcast_free(mcast);
767         }
768 }
769
770 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
771 {
772         /* reserved QPN, prefix, scope */
773         if (memcmp(addr, broadcast, 6))
774                 return 0;
775         /* signature lower, pkey */
776         if (memcmp(addr + 7, broadcast + 7, 3))
777                 return 0;
778         return 1;
779 }
780
781 void ipoib_mcast_restart_task(struct work_struct *work)
782 {
783         struct ipoib_dev_priv *priv =
784                 container_of(work, struct ipoib_dev_priv, restart_task);
785         struct net_device *dev = priv->dev;
786         struct netdev_hw_addr *ha;
787         struct ipoib_mcast *mcast, *tmcast;
788         LIST_HEAD(remove_list);
789         unsigned long flags;
790         struct ib_sa_mcmember_rec rec;
791
792         ipoib_dbg_mcast(priv, "restarting multicast task\n");
793
794         ipoib_mcast_stop_thread(dev, 0);
795
796         local_irq_save(flags);
797         netif_addr_lock(dev);
798         spin_lock(&priv->lock);
799
800         /*
801          * Unfortunately, the networking core only gives us a list of all of
802          * the multicast hardware addresses. We need to figure out which ones
803          * are new and which ones have been removed
804          */
805
806         /* Clear out the found flag */
807         list_for_each_entry(mcast, &priv->multicast_list, list)
808                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
809
810         /* Mark all of the entries that are found or don't exist */
811         netdev_for_each_mc_addr(ha, dev) {
812                 union ib_gid mgid;
813
814                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
815                         continue;
816
817                 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
818
819                 mcast = __ipoib_mcast_find(dev, &mgid);
820                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
821                         struct ipoib_mcast *nmcast;
822
823                         /* ignore group which is directly joined by userspace */
824                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
825                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
826                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
827                                                 mgid.raw);
828                                 continue;
829                         }
830
831                         /* Not found or send-only group, let's add a new entry */
832                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
833                                         mgid.raw);
834
835                         nmcast = ipoib_mcast_alloc(dev, 0);
836                         if (!nmcast) {
837                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
838                                 continue;
839                         }
840
841                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
842
843                         nmcast->mcmember.mgid = mgid;
844
845                         if (mcast) {
846                                 /* Destroy the send only entry */
847                                 list_move_tail(&mcast->list, &remove_list);
848
849                                 rb_replace_node(&mcast->rb_node,
850                                                 &nmcast->rb_node,
851                                                 &priv->multicast_tree);
852                         } else
853                                 __ipoib_mcast_add(dev, nmcast);
854
855                         list_add_tail(&nmcast->list, &priv->multicast_list);
856                 }
857
858                 if (mcast)
859                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
860         }
861
862         /* Remove all of the entries don't exist anymore */
863         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
864                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
865                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
866                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
867                                         mcast->mcmember.mgid.raw);
868
869                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
870
871                         /* Move to the remove list */
872                         list_move_tail(&mcast->list, &remove_list);
873                 }
874         }
875
876         spin_unlock(&priv->lock);
877         netif_addr_unlock(dev);
878         local_irq_restore(flags);
879
880         /* We have to cancel outside of the spinlock */
881         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
882                 ipoib_mcast_leave(mcast->dev, mcast);
883                 ipoib_mcast_free(mcast);
884         }
885
886         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
887                 ipoib_mcast_start_thread(dev);
888 }
889
890 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
891
892 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
893 {
894         struct ipoib_mcast_iter *iter;
895
896         iter = kmalloc(sizeof *iter, GFP_KERNEL);
897         if (!iter)
898                 return NULL;
899
900         iter->dev = dev;
901         memset(iter->mgid.raw, 0, 16);
902
903         if (ipoib_mcast_iter_next(iter)) {
904                 kfree(iter);
905                 return NULL;
906         }
907
908         return iter;
909 }
910
911 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
912 {
913         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
914         struct rb_node *n;
915         struct ipoib_mcast *mcast;
916         int ret = 1;
917
918         spin_lock_irq(&priv->lock);
919
920         n = rb_first(&priv->multicast_tree);
921
922         while (n) {
923                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
924
925                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
926                            sizeof (union ib_gid)) < 0) {
927                         iter->mgid      = mcast->mcmember.mgid;
928                         iter->created   = mcast->created;
929                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
930                         iter->complete  = !!mcast->ah;
931                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
932
933                         ret = 0;
934
935                         break;
936                 }
937
938                 n = rb_next(n);
939         }
940
941         spin_unlock_irq(&priv->lock);
942
943         return ret;
944 }
945
946 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
947                            union ib_gid *mgid,
948                            unsigned long *created,
949                            unsigned int *queuelen,
950                            unsigned int *complete,
951                            unsigned int *send_only)
952 {
953         *mgid      = iter->mgid;
954         *created   = iter->created;
955         *queuelen  = iter->queuelen;
956         *complete  = iter->complete;
957         *send_only = iter->send_only;
958 }
959
960 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */