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MERGE-master-patchset-edits
[linux-2.6/openmoko-kernel.git] / drivers / infiniband / ulp / ipoib / ipoib_multicast.c
blob425e31112ed707d18b7acf1fc9938280dd137a2a
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->dst->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
366 /*
367 * Take rtnl_lock to avoid racing with ipoib_stop() and
368 * turning the carrier back on while a device is being
369 * removed.
370 */
371 rtnl_lock();
372 netif_carrier_on(priv->dev);
373 rtnl_unlock();
374 }
375
376 static int ipoib_mcast_join_complete(int status,
377 struct ib_sa_multicast *multicast)
378 {
379 struct ipoib_mcast *mcast = multicast->context;
380 struct net_device *dev = mcast->dev;
381 struct ipoib_dev_priv *priv = netdev_priv(dev);
382
383 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
384 mcast->mcmember.mgid.raw, status);
385
386 /* We trap for port events ourselves. */
387 if (status == -ENETRESET)
388 return 0;
389
390 if (!status)
391 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
392
393 if (!status) {
394 mcast->backoff = 1;
395 mutex_lock(&mcast_mutex);
396 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
397 queue_delayed_work(ipoib_workqueue,
398 &priv->mcast_task, 0);
399 mutex_unlock(&mcast_mutex);
400
401 /*
402 * Defer carrier on work to ipoib_workqueue to avoid a
403 * deadlock on rtnl_lock here.
404 */
405 if (mcast == priv->broadcast)
406 queue_work(ipoib_workqueue, &priv->carrier_on_task);
407
408 return 0;
409 }
410
411 if (mcast->logcount++ < 20) {
412 if (status == -ETIMEDOUT || status == -EAGAIN) {
413 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
414 mcast->mcmember.mgid.raw, status);
415 } else {
416 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
417 mcast->mcmember.mgid.raw, status);
418 }
419 }
420
421 mcast->backoff *= 2;
422 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
423 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
424
425 /* Clear the busy flag so we try again */
426 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
427
428 mutex_lock(&mcast_mutex);
429 spin_lock_irq(&priv->lock);
430 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
431 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
432 mcast->backoff * HZ);
433 spin_unlock_irq(&priv->lock);
434 mutex_unlock(&mcast_mutex);
435
436 return status;
437 }
438
439 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
440 int create)
441 {
442 struct ipoib_dev_priv *priv = netdev_priv(dev);
443 struct ib_sa_mcmember_rec rec = {
444 .join_state = 1
445 };
446 ib_sa_comp_mask comp_mask;
447 int ret = 0;
448
449 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
450
451 rec.mgid = mcast->mcmember.mgid;
452 rec.port_gid = priv->local_gid;
453 rec.pkey = cpu_to_be16(priv->pkey);
454
455 comp_mask =
456 IB_SA_MCMEMBER_REC_MGID |
457 IB_SA_MCMEMBER_REC_PORT_GID |
458 IB_SA_MCMEMBER_REC_PKEY |
459 IB_SA_MCMEMBER_REC_JOIN_STATE;
460
461 if (create) {
462 comp_mask |=
463 IB_SA_MCMEMBER_REC_QKEY |
464 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
465 IB_SA_MCMEMBER_REC_MTU |
466 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
467 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
468 IB_SA_MCMEMBER_REC_RATE |
469 IB_SA_MCMEMBER_REC_SL |
470 IB_SA_MCMEMBER_REC_FLOW_LABEL |
471 IB_SA_MCMEMBER_REC_HOP_LIMIT;
472
473 rec.qkey = priv->broadcast->mcmember.qkey;
474 rec.mtu_selector = IB_SA_EQ;
475 rec.mtu = priv->broadcast->mcmember.mtu;
476 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
477 rec.rate_selector = IB_SA_EQ;
478 rec.rate = priv->broadcast->mcmember.rate;
479 rec.sl = priv->broadcast->mcmember.sl;
480 rec.flow_label = priv->broadcast->mcmember.flow_label;
481 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
482 }
483
484 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
485 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
486 &rec, comp_mask, GFP_KERNEL,
487 ipoib_mcast_join_complete, mcast);
488 if (IS_ERR(mcast->mc)) {
489 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
490 ret = PTR_ERR(mcast->mc);
491 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
492
493 mcast->backoff *= 2;
494 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
495 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
496
497 mutex_lock(&mcast_mutex);
498 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
499 queue_delayed_work(ipoib_workqueue,
500 &priv->mcast_task,
501 mcast->backoff * HZ);
502 mutex_unlock(&mcast_mutex);
503 }
504 }
505
506 void ipoib_mcast_join_task(struct work_struct *work)
507 {
508 struct ipoib_dev_priv *priv =
509 container_of(work, struct ipoib_dev_priv, mcast_task.work);
510 struct net_device *dev = priv->dev;
511
512 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
513 return;
514
515 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
516 ipoib_warn(priv, "ib_query_gid() failed\n");
517 else
518 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
519
520 {
521 struct ib_port_attr attr;
522
523 if (!ib_query_port(priv->ca, priv->port, &attr))
524 priv->local_lid = attr.lid;
525 else
526 ipoib_warn(priv, "ib_query_port failed\n");
527 }
528
529 if (!priv->broadcast) {
530 struct ipoib_mcast *broadcast;
531
532 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
533 return;
534
535 broadcast = ipoib_mcast_alloc(dev, 1);
536 if (!broadcast) {
537 ipoib_warn(priv, "failed to allocate broadcast group\n");
538 mutex_lock(&mcast_mutex);
539 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
540 queue_delayed_work(ipoib_workqueue,
541 &priv->mcast_task, HZ);
542 mutex_unlock(&mcast_mutex);
543 return;
544 }
545
546 spin_lock_irq(&priv->lock);
547 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
548 sizeof (union ib_gid));
549 priv->broadcast = broadcast;
550
551 __ipoib_mcast_add(dev, priv->broadcast);
552 spin_unlock_irq(&priv->lock);
553 }
554
555 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
556 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
557 ipoib_mcast_join(dev, priv->broadcast, 0);
558 return;
559 }
560
561 while (1) {
562 struct ipoib_mcast *mcast = NULL;
563
564 spin_lock_irq(&priv->lock);
565 list_for_each_entry(mcast, &priv->multicast_list, list) {
566 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
567 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
568 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
569 /* Found the next unjoined group */
570 break;
571 }
572 }
573 spin_unlock_irq(&priv->lock);
574
575 if (&mcast->list == &priv->multicast_list) {
576 /* All done */
577 break;
578 }
579
580 ipoib_mcast_join(dev, mcast, 1);
581 return;
582 }
583
584 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
585
586 if (!ipoib_cm_admin_enabled(dev)) {
587 rtnl_lock();
588 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
589 rtnl_unlock();
590 }
591
592 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
593
594 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
595 }
596
597 int ipoib_mcast_start_thread(struct net_device *dev)
598 {
599 struct ipoib_dev_priv *priv = netdev_priv(dev);
600
601 ipoib_dbg_mcast(priv, "starting multicast thread\n");
602
603 mutex_lock(&mcast_mutex);
604 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
605 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
606 mutex_unlock(&mcast_mutex);
607
608 return 0;
609 }
610
611 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
612 {
613 struct ipoib_dev_priv *priv = netdev_priv(dev);
614
615 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
616
617 mutex_lock(&mcast_mutex);
618 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
619 cancel_delayed_work(&priv->mcast_task);
620 mutex_unlock(&mcast_mutex);
621
622 if (flush)
623 flush_workqueue(ipoib_workqueue);
624
625 return 0;
626 }
627
628 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
629 {
630 struct ipoib_dev_priv *priv = netdev_priv(dev);
631 int ret = 0;
632
633 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
634 ib_sa_free_multicast(mcast->mc);
635
636 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
637 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
638 mcast->mcmember.mgid.raw);
639
640 /* Remove ourselves from the multicast group */
641 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
642 be16_to_cpu(mcast->mcmember.mlid));
643 if (ret)
644 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
645 }
646
647 return 0;
648 }
649
650 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
651 {
652 struct ipoib_dev_priv *priv = netdev_priv(dev);
653 struct ipoib_mcast *mcast;
654 unsigned long flags;
655
656 spin_lock_irqsave(&priv->lock, flags);
657
658 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
659 !priv->broadcast ||
660 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
661 ++dev->stats.tx_dropped;
662 dev_kfree_skb_any(skb);
663 goto unlock;
664 }
665
666 mcast = __ipoib_mcast_find(dev, mgid);
667 if (!mcast) {
668 /* Let's create a new send only group now */
669 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
670 mgid);
671
672 mcast = ipoib_mcast_alloc(dev, 0);
673 if (!mcast) {
674 ipoib_warn(priv, "unable to allocate memory for "
675 "multicast structure\n");
676 ++dev->stats.tx_dropped;
677 dev_kfree_skb_any(skb);
678 goto out;
679 }
680
681 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
682 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
683 __ipoib_mcast_add(dev, mcast);
684 list_add_tail(&mcast->list, &priv->multicast_list);
685 }
686
687 if (!mcast->ah) {
688 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
689 skb_queue_tail(&mcast->pkt_queue, skb);
690 else {
691 ++dev->stats.tx_dropped;
692 dev_kfree_skb_any(skb);
693 }
694
695 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
696 ipoib_dbg_mcast(priv, "no address vector, "
697 "but multicast join already started\n");
698 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
699 ipoib_mcast_sendonly_join(mcast);
700
701 /*
702 * If lookup completes between here and out:, don't
703 * want to send packet twice.
704 */
705 mcast = NULL;
706 }
707
708 out:
709 if (mcast && mcast->ah) {
710 if (skb->dst &&
711 skb->dst->neighbour &&
712 !*to_ipoib_neigh(skb->dst->neighbour)) {
713 struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
714 skb->dev);
715
716 if (neigh) {
717 kref_get(&mcast->ah->ref);
718 neigh->ah = mcast->ah;
719 list_add_tail(&neigh->list, &mcast->neigh_list);
720 }
721 }
722
723 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
724 }
725
726 unlock:
727 spin_unlock_irqrestore(&priv->lock, flags);
728 }
729
730 void ipoib_mcast_dev_flush(struct net_device *dev)
731 {
732 struct ipoib_dev_priv *priv = netdev_priv(dev);
733 LIST_HEAD(remove_list);
734 struct ipoib_mcast *mcast, *tmcast;
735 unsigned long flags;
736
737 ipoib_dbg_mcast(priv, "flushing multicast list\n");
738
739 spin_lock_irqsave(&priv->lock, flags);
740
741 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
742 list_del(&mcast->list);
743 rb_erase(&mcast->rb_node, &priv->multicast_tree);
744 list_add_tail(&mcast->list, &remove_list);
745 }
746
747 if (priv->broadcast) {
748 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
749 list_add_tail(&priv->broadcast->list, &remove_list);
750 priv->broadcast = NULL;
751 }
752
753 spin_unlock_irqrestore(&priv->lock, flags);
754
755 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
756 ipoib_mcast_leave(dev, mcast);
757 ipoib_mcast_free(mcast);
758 }
759 }
760
761 void ipoib_mcast_restart_task(struct work_struct *work)
762 {
763 struct ipoib_dev_priv *priv =
764 container_of(work, struct ipoib_dev_priv, restart_task);
765 struct net_device *dev = priv->dev;
766 struct dev_mc_list *mclist;
767 struct ipoib_mcast *mcast, *tmcast;
768 LIST_HEAD(remove_list);
769 unsigned long flags;
770 struct ib_sa_mcmember_rec rec;
771
772 ipoib_dbg_mcast(priv, "restarting multicast task\n");
773
774 ipoib_mcast_stop_thread(dev, 0);
775
776 local_irq_save(flags);
777 netif_addr_lock(dev);
778 spin_lock(&priv->lock);
779
780 /*
781 * Unfortunately, the networking core only gives us a list of all of
782 * the multicast hardware addresses. We need to figure out which ones
783 * are new and which ones have been removed
784 */
785
786 /* Clear out the found flag */
787 list_for_each_entry(mcast, &priv->multicast_list, list)
788 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
789
790 /* Mark all of the entries that are found or don't exist */
791 for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
792 union ib_gid mgid;
793
794 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
795
796 mcast = __ipoib_mcast_find(dev, &mgid);
797 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
798 struct ipoib_mcast *nmcast;
799
800 /* ignore group which is directly joined by userspace */
801 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
802 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
803 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
804 mgid.raw);
805 continue;
806 }
807
808 /* Not found or send-only group, let's add a new entry */
809 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
810 mgid.raw);
811
812 nmcast = ipoib_mcast_alloc(dev, 0);
813 if (!nmcast) {
814 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
815 continue;
816 }
817
818 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
819
820 nmcast->mcmember.mgid = mgid;
821
822 if (mcast) {
823 /* Destroy the send only entry */
824 list_move_tail(&mcast->list, &remove_list);
825
826 rb_replace_node(&mcast->rb_node,
827 &nmcast->rb_node,
828 &priv->multicast_tree);
829 } else
830 __ipoib_mcast_add(dev, nmcast);
831
832 list_add_tail(&nmcast->list, &priv->multicast_list);
833 }
834
835 if (mcast)
836 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
837 }
838
839 /* Remove all of the entries don't exist anymore */
840 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
841 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
842 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
843 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
844 mcast->mcmember.mgid.raw);
845
846 rb_erase(&mcast->rb_node, &priv->multicast_tree);
847
848 /* Move to the remove list */
849 list_move_tail(&mcast->list, &remove_list);
850 }
851 }
852
853 spin_unlock(&priv->lock);
854 netif_addr_unlock(dev);
855 local_irq_restore(flags);
856
857 /* We have to cancel outside of the spinlock */
858 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
859 ipoib_mcast_leave(mcast->dev, mcast);
860 ipoib_mcast_free(mcast);
861 }
862
863 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
864 ipoib_mcast_start_thread(dev);
865 }
866
867 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
868
869 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
870 {
871 struct ipoib_mcast_iter *iter;
872
873 iter = kmalloc(sizeof *iter, GFP_KERNEL);
874 if (!iter)
875 return NULL;
876
877 iter->dev = dev;
878 memset(iter->mgid.raw, 0, 16);
879
880 if (ipoib_mcast_iter_next(iter)) {
881 kfree(iter);
882 return NULL;
883 }
884
885 return iter;
886 }
887
888 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
889 {
890 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
891 struct rb_node *n;
892 struct ipoib_mcast *mcast;
893 int ret = 1;
894
895 spin_lock_irq(&priv->lock);
896
897 n = rb_first(&priv->multicast_tree);
898
899 while (n) {
900 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
901
902 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
903 sizeof (union ib_gid)) < 0) {
904 iter->mgid = mcast->mcmember.mgid;
905 iter->created = mcast->created;
906 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
907 iter->complete = !!mcast->ah;
908 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
909
910 ret = 0;
911
912 break;
913 }
914
915 n = rb_next(n);
916 }
917
918 spin_unlock_irq(&priv->lock);
919
920 return ret;
921 }
922
923 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
924 union ib_gid *mgid,
925 unsigned long *created,
926 unsigned int *queuelen,
927 unsigned int *complete,
928 unsigned int *send_only)
929 {
930 *mgid = iter->mgid;
931 *created = iter->created;
932 *queuelen = iter->queuelen;
933 *complete = iter->complete;
934 *send_only = iter->send_only;
935 }
936
937 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
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