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