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net: convert multicast list to list_head
[deliverable/linux.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 */
Linux kernel - Deliverables
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