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net: Abstract dst->neighbour accesses behind helpers.
[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 #include <linux/slab.h>
44
45 #include <net/dst.h>
46
47 #include "ipoib.h"
48
49 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
50 static int mcast_debug_level;
51
52 module_param(mcast_debug_level, int, 0644);
53 MODULE_PARM_DESC(mcast_debug_level,
54 "Enable multicast debug tracing if > 0");
55 #endif
56
57 static DEFINE_MUTEX(mcast_mutex);
58
59 struct ipoib_mcast_iter {
60 struct net_device *dev;
61 union ib_gid mgid;
62 unsigned long created;
63 unsigned int queuelen;
64 unsigned int complete;
65 unsigned int send_only;
66 };
67
68 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
69 {
70 struct net_device *dev = mcast->dev;
71 struct ipoib_dev_priv *priv = netdev_priv(dev);
72 struct ipoib_neigh *neigh, *tmp;
73 int tx_dropped = 0;
74
75 ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
76 mcast->mcmember.mgid.raw);
77
78 spin_lock_irq(&priv->lock);
79
80 list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
81 /*
82 * It's safe to call ipoib_put_ah() inside priv->lock
83 * here, because we know that mcast->ah will always
84 * hold one more reference, so ipoib_put_ah() will
85 * never do more than decrement the ref count.
86 */
87 if (neigh->ah)
88 ipoib_put_ah(neigh->ah);
89 ipoib_neigh_free(dev, neigh);
90 }
91
92 spin_unlock_irq(&priv->lock);
93
94 if (mcast->ah)
95 ipoib_put_ah(mcast->ah);
96
97 while (!skb_queue_empty(&mcast->pkt_queue)) {
98 ++tx_dropped;
99 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
100 }
101
102 netif_tx_lock_bh(dev);
103 dev->stats.tx_dropped += tx_dropped;
104 netif_tx_unlock_bh(dev);
105
106 kfree(mcast);
107 }
108
109 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
110 int can_sleep)
111 {
112 struct ipoib_mcast *mcast;
113
114 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
115 if (!mcast)
116 return NULL;
117
118 mcast->dev = dev;
119 mcast->created = jiffies;
120 mcast->backoff = 1;
121
122 INIT_LIST_HEAD(&mcast->list);
123 INIT_LIST_HEAD(&mcast->neigh_list);
124 skb_queue_head_init(&mcast->pkt_queue);
125
126 return mcast;
127 }
128
129 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
130 {
131 struct ipoib_dev_priv *priv = netdev_priv(dev);
132 struct rb_node *n = priv->multicast_tree.rb_node;
133
134 while (n) {
135 struct ipoib_mcast *mcast;
136 int ret;
137
138 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
139
140 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
141 sizeof (union ib_gid));
142 if (ret < 0)
143 n = n->rb_left;
144 else if (ret > 0)
145 n = n->rb_right;
146 else
147 return mcast;
148 }
149
150 return NULL;
151 }
152
153 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
154 {
155 struct ipoib_dev_priv *priv = netdev_priv(dev);
156 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
157
158 while (*n) {
159 struct ipoib_mcast *tmcast;
160 int ret;
161
162 pn = *n;
163 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
164
165 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
166 sizeof (union ib_gid));
167 if (ret < 0)
168 n = &pn->rb_left;
169 else if (ret > 0)
170 n = &pn->rb_right;
171 else
172 return -EEXIST;
173 }
174
175 rb_link_node(&mcast->rb_node, pn, n);
176 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
177
178 return 0;
179 }
180
181 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
182 struct ib_sa_mcmember_rec *mcmember)
183 {
184 struct net_device *dev = mcast->dev;
185 struct ipoib_dev_priv *priv = netdev_priv(dev);
186 struct ipoib_ah *ah;
187 int ret;
188 int set_qkey = 0;
189
190 mcast->mcmember = *mcmember;
191
192 /* Set the cached Q_Key before we attach if it's the broadcast group */
193 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
194 sizeof (union ib_gid))) {
195 spin_lock_irq(&priv->lock);
196 if (!priv->broadcast) {
197 spin_unlock_irq(&priv->lock);
198 return -EAGAIN;
199 }
200 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
201 spin_unlock_irq(&priv->lock);
202 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
203 set_qkey = 1;
204 }
205
206 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
207 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
208 ipoib_warn(priv, "multicast group %pI6 already attached\n",
209 mcast->mcmember.mgid.raw);
210
211 return 0;
212 }
213
214 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
215 &mcast->mcmember.mgid, set_qkey);
216 if (ret < 0) {
217 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
218 mcast->mcmember.mgid.raw);
219
220 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
221 return ret;
222 }
223 }
224
225 {
226 struct ib_ah_attr av = {
227 .dlid = be16_to_cpu(mcast->mcmember.mlid),
228 .port_num = priv->port,
229 .sl = mcast->mcmember.sl,
230 .ah_flags = IB_AH_GRH,
231 .static_rate = mcast->mcmember.rate,
232 .grh = {
233 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
234 .hop_limit = mcast->mcmember.hop_limit,
235 .sgid_index = 0,
236 .traffic_class = mcast->mcmember.traffic_class
237 }
238 };
239 av.grh.dgid = mcast->mcmember.mgid;
240
241 ah = ipoib_create_ah(dev, priv->pd, &av);
242 if (!ah) {
243 ipoib_warn(priv, "ib_address_create failed\n");
244 } else {
245 spin_lock_irq(&priv->lock);
246 mcast->ah = ah;
247 spin_unlock_irq(&priv->lock);
248
249 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
250 mcast->mcmember.mgid.raw,
251 mcast->ah->ah,
252 be16_to_cpu(mcast->mcmember.mlid),
253 mcast->mcmember.sl);
254 }
255 }
256
257 /* actually send any queued packets */
258 netif_tx_lock_bh(dev);
259 while (!skb_queue_empty(&mcast->pkt_queue)) {
260 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
261 struct dst_entry *dst = skb_dst(skb);
262 struct neighbour *n = NULL;
263
264 netif_tx_unlock_bh(dev);
265
266 skb->dev = dev;
267 if (dst)
268 n = dst_get_neighbour(dst);
269 if (!dst || !n) {
270 /* put pseudoheader back on for next time */
271 skb_push(skb, sizeof (struct ipoib_pseudoheader));
272 }
273
274 if (dev_queue_xmit(skb))
275 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
276 netif_tx_lock_bh(dev);
277 }
278 netif_tx_unlock_bh(dev);
279
280 return 0;
281 }
282
283 static int
284 ipoib_mcast_sendonly_join_complete(int status,
285 struct ib_sa_multicast *multicast)
286 {
287 struct ipoib_mcast *mcast = multicast->context;
288 struct net_device *dev = mcast->dev;
289
290 /* We trap for port events ourselves. */
291 if (status == -ENETRESET)
292 return 0;
293
294 if (!status)
295 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
296
297 if (status) {
298 if (mcast->logcount++ < 20)
299 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n",
300 mcast->mcmember.mgid.raw, status);
301
302 /* Flush out any queued packets */
303 netif_tx_lock_bh(dev);
304 while (!skb_queue_empty(&mcast->pkt_queue)) {
305 ++dev->stats.tx_dropped;
306 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
307 }
308 netif_tx_unlock_bh(dev);
309
310 /* Clear the busy flag so we try again */
311 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
312 &mcast->flags);
313 }
314 return status;
315 }
316
317 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
318 {
319 struct net_device *dev = mcast->dev;
320 struct ipoib_dev_priv *priv = netdev_priv(dev);
321 struct ib_sa_mcmember_rec rec = {
322 #if 0 /* Some SMs don't support send-only yet */
323 .join_state = 4
324 #else
325 .join_state = 1
326 #endif
327 };
328 int ret = 0;
329
330 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
331 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
332 return -ENODEV;
333 }
334
335 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
336 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
337 return -EBUSY;
338 }
339
340 rec.mgid = mcast->mcmember.mgid;
341 rec.port_gid = priv->local_gid;
342 rec.pkey = cpu_to_be16(priv->pkey);
343
344 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
345 priv->port, &rec,
346 IB_SA_MCMEMBER_REC_MGID |
347 IB_SA_MCMEMBER_REC_PORT_GID |
348 IB_SA_MCMEMBER_REC_PKEY |
349 IB_SA_MCMEMBER_REC_JOIN_STATE,
350 GFP_ATOMIC,
351 ipoib_mcast_sendonly_join_complete,
352 mcast);
353 if (IS_ERR(mcast->mc)) {
354 ret = PTR_ERR(mcast->mc);
355 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
356 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
357 ret);
358 } else {
359 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n",
360 mcast->mcmember.mgid.raw);
361 }
362
363 return ret;
364 }
365
366 void ipoib_mcast_carrier_on_task(struct work_struct *work)
367 {
368 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
369 carrier_on_task);
370 struct ib_port_attr attr;
371
372 /*
373 * Take rtnl_lock to avoid racing with ipoib_stop() and
374 * turning the carrier back on while a device is being
375 * removed.
376 */
377 if (ib_query_port(priv->ca, priv->port, &attr) ||
378 attr.state != IB_PORT_ACTIVE) {
379 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
380 return;
381 }
382
383 rtnl_lock();
384 netif_carrier_on(priv->dev);
385 rtnl_unlock();
386 }
387
388 static int ipoib_mcast_join_complete(int status,
389 struct ib_sa_multicast *multicast)
390 {
391 struct ipoib_mcast *mcast = multicast->context;
392 struct net_device *dev = mcast->dev;
393 struct ipoib_dev_priv *priv = netdev_priv(dev);
394
395 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
396 mcast->mcmember.mgid.raw, status);
397
398 /* We trap for port events ourselves. */
399 if (status == -ENETRESET)
400 return 0;
401
402 if (!status)
403 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
404
405 if (!status) {
406 mcast->backoff = 1;
407 mutex_lock(&mcast_mutex);
408 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
409 queue_delayed_work(ipoib_workqueue,
410 &priv->mcast_task, 0);
411 mutex_unlock(&mcast_mutex);
412
413 /*
414 * Defer carrier on work to ipoib_workqueue to avoid a
415 * deadlock on rtnl_lock here.
416 */
417 if (mcast == priv->broadcast)
418 queue_work(ipoib_workqueue, &priv->carrier_on_task);
419
420 return 0;
421 }
422
423 if (mcast->logcount++ < 20) {
424 if (status == -ETIMEDOUT || status == -EAGAIN) {
425 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
426 mcast->mcmember.mgid.raw, status);
427 } else {
428 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
429 mcast->mcmember.mgid.raw, status);
430 }
431 }
432
433 mcast->backoff *= 2;
434 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
435 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
436
437 /* Clear the busy flag so we try again */
438 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
439
440 mutex_lock(&mcast_mutex);
441 spin_lock_irq(&priv->lock);
442 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
443 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
444 mcast->backoff * HZ);
445 spin_unlock_irq(&priv->lock);
446 mutex_unlock(&mcast_mutex);
447
448 return status;
449 }
450
451 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
452 int create)
453 {
454 struct ipoib_dev_priv *priv = netdev_priv(dev);
455 struct ib_sa_mcmember_rec rec = {
456 .join_state = 1
457 };
458 ib_sa_comp_mask comp_mask;
459 int ret = 0;
460
461 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
462
463 rec.mgid = mcast->mcmember.mgid;
464 rec.port_gid = priv->local_gid;
465 rec.pkey = cpu_to_be16(priv->pkey);
466
467 comp_mask =
468 IB_SA_MCMEMBER_REC_MGID |
469 IB_SA_MCMEMBER_REC_PORT_GID |
470 IB_SA_MCMEMBER_REC_PKEY |
471 IB_SA_MCMEMBER_REC_JOIN_STATE;
472
473 if (create) {
474 comp_mask |=
475 IB_SA_MCMEMBER_REC_QKEY |
476 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
477 IB_SA_MCMEMBER_REC_MTU |
478 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
479 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
480 IB_SA_MCMEMBER_REC_RATE |
481 IB_SA_MCMEMBER_REC_SL |
482 IB_SA_MCMEMBER_REC_FLOW_LABEL |
483 IB_SA_MCMEMBER_REC_HOP_LIMIT;
484
485 rec.qkey = priv->broadcast->mcmember.qkey;
486 rec.mtu_selector = IB_SA_EQ;
487 rec.mtu = priv->broadcast->mcmember.mtu;
488 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
489 rec.rate_selector = IB_SA_EQ;
490 rec.rate = priv->broadcast->mcmember.rate;
491 rec.sl = priv->broadcast->mcmember.sl;
492 rec.flow_label = priv->broadcast->mcmember.flow_label;
493 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
494 }
495
496 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
497 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
498 &rec, comp_mask, GFP_KERNEL,
499 ipoib_mcast_join_complete, mcast);
500 if (IS_ERR(mcast->mc)) {
501 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
502 ret = PTR_ERR(mcast->mc);
503 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
504
505 mcast->backoff *= 2;
506 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
507 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
508
509 mutex_lock(&mcast_mutex);
510 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
511 queue_delayed_work(ipoib_workqueue,
512 &priv->mcast_task,
513 mcast->backoff * HZ);
514 mutex_unlock(&mcast_mutex);
515 }
516 }
517
518 void ipoib_mcast_join_task(struct work_struct *work)
519 {
520 struct ipoib_dev_priv *priv =
521 container_of(work, struct ipoib_dev_priv, mcast_task.work);
522 struct net_device *dev = priv->dev;
523
524 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
525 return;
526
527 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
528 ipoib_warn(priv, "ib_query_gid() failed\n");
529 else
530 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
531
532 {
533 struct ib_port_attr attr;
534
535 if (!ib_query_port(priv->ca, priv->port, &attr))
536 priv->local_lid = attr.lid;
537 else
538 ipoib_warn(priv, "ib_query_port failed\n");
539 }
540
541 if (!priv->broadcast) {
542 struct ipoib_mcast *broadcast;
543
544 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
545 return;
546
547 broadcast = ipoib_mcast_alloc(dev, 1);
548 if (!broadcast) {
549 ipoib_warn(priv, "failed to allocate broadcast group\n");
550 mutex_lock(&mcast_mutex);
551 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
552 queue_delayed_work(ipoib_workqueue,
553 &priv->mcast_task, HZ);
554 mutex_unlock(&mcast_mutex);
555 return;
556 }
557
558 spin_lock_irq(&priv->lock);
559 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
560 sizeof (union ib_gid));
561 priv->broadcast = broadcast;
562
563 __ipoib_mcast_add(dev, priv->broadcast);
564 spin_unlock_irq(&priv->lock);
565 }
566
567 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
568 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
569 ipoib_mcast_join(dev, priv->broadcast, 0);
570 return;
571 }
572
573 while (1) {
574 struct ipoib_mcast *mcast = NULL;
575
576 spin_lock_irq(&priv->lock);
577 list_for_each_entry(mcast, &priv->multicast_list, list) {
578 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
579 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
580 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
581 /* Found the next unjoined group */
582 break;
583 }
584 }
585 spin_unlock_irq(&priv->lock);
586
587 if (&mcast->list == &priv->multicast_list) {
588 /* All done */
589 break;
590 }
591
592 ipoib_mcast_join(dev, mcast, 1);
593 return;
594 }
595
596 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
597
598 if (!ipoib_cm_admin_enabled(dev)) {
599 rtnl_lock();
600 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
601 rtnl_unlock();
602 }
603
604 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
605
606 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
607 }
608
609 int ipoib_mcast_start_thread(struct net_device *dev)
610 {
611 struct ipoib_dev_priv *priv = netdev_priv(dev);
612
613 ipoib_dbg_mcast(priv, "starting multicast thread\n");
614
615 mutex_lock(&mcast_mutex);
616 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
617 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
618 mutex_unlock(&mcast_mutex);
619
620 return 0;
621 }
622
623 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
624 {
625 struct ipoib_dev_priv *priv = netdev_priv(dev);
626
627 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
628
629 mutex_lock(&mcast_mutex);
630 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
631 cancel_delayed_work(&priv->mcast_task);
632 mutex_unlock(&mcast_mutex);
633
634 if (flush)
635 flush_workqueue(ipoib_workqueue);
636
637 return 0;
638 }
639
640 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
641 {
642 struct ipoib_dev_priv *priv = netdev_priv(dev);
643 int ret = 0;
644
645 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
646 ib_sa_free_multicast(mcast->mc);
647
648 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
649 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
650 mcast->mcmember.mgid.raw);
651
652 /* Remove ourselves from the multicast group */
653 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
654 be16_to_cpu(mcast->mcmember.mlid));
655 if (ret)
656 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
657 }
658
659 return 0;
660 }
661
662 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
663 {
664 struct ipoib_dev_priv *priv = netdev_priv(dev);
665 struct ipoib_mcast *mcast;
666 unsigned long flags;
667
668 spin_lock_irqsave(&priv->lock, flags);
669
670 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
671 !priv->broadcast ||
672 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
673 ++dev->stats.tx_dropped;
674 dev_kfree_skb_any(skb);
675 goto unlock;
676 }
677
678 mcast = __ipoib_mcast_find(dev, mgid);
679 if (!mcast) {
680 /* Let's create a new send only group now */
681 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
682 mgid);
683
684 mcast = ipoib_mcast_alloc(dev, 0);
685 if (!mcast) {
686 ipoib_warn(priv, "unable to allocate memory for "
687 "multicast structure\n");
688 ++dev->stats.tx_dropped;
689 dev_kfree_skb_any(skb);
690 goto out;
691 }
692
693 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
694 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
695 __ipoib_mcast_add(dev, mcast);
696 list_add_tail(&mcast->list, &priv->multicast_list);
697 }
698
699 if (!mcast->ah) {
700 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
701 skb_queue_tail(&mcast->pkt_queue, skb);
702 else {
703 ++dev->stats.tx_dropped;
704 dev_kfree_skb_any(skb);
705 }
706
707 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
708 ipoib_dbg_mcast(priv, "no address vector, "
709 "but multicast join already started\n");
710 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
711 ipoib_mcast_sendonly_join(mcast);
712
713 /*
714 * If lookup completes between here and out:, don't
715 * want to send packet twice.
716 */
717 mcast = NULL;
718 }
719
720 out:
721 if (mcast && mcast->ah) {
722 struct dst_entry *dst = skb_dst(skb);
723 struct neighbour *n = NULL;
724 if (dst)
725 n = dst_get_neighbour(dst);
726 if (n && !*to_ipoib_neigh(n)) {
727 struct ipoib_neigh *neigh = ipoib_neigh_alloc(n,
728 skb->dev);
729
730 if (neigh) {
731 kref_get(&mcast->ah->ref);
732 neigh->ah = mcast->ah;
733 list_add_tail(&neigh->list, &mcast->neigh_list);
734 }
735 }
736
737 spin_unlock_irqrestore(&priv->lock, flags);
738 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
739 return;
740 }
741
742 unlock:
743 spin_unlock_irqrestore(&priv->lock, flags);
744 }
745
746 void ipoib_mcast_dev_flush(struct net_device *dev)
747 {
748 struct ipoib_dev_priv *priv = netdev_priv(dev);
749 LIST_HEAD(remove_list);
750 struct ipoib_mcast *mcast, *tmcast;
751 unsigned long flags;
752
753 ipoib_dbg_mcast(priv, "flushing multicast list\n");
754
755 spin_lock_irqsave(&priv->lock, flags);
756
757 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
758 list_del(&mcast->list);
759 rb_erase(&mcast->rb_node, &priv->multicast_tree);
760 list_add_tail(&mcast->list, &remove_list);
761 }
762
763 if (priv->broadcast) {
764 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
765 list_add_tail(&priv->broadcast->list, &remove_list);
766 priv->broadcast = NULL;
767 }
768
769 spin_unlock_irqrestore(&priv->lock, flags);
770
771 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
772 ipoib_mcast_leave(dev, mcast);
773 ipoib_mcast_free(mcast);
774 }
775 }
776
777 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
778 {
779 /* reserved QPN, prefix, scope */
780 if (memcmp(addr, broadcast, 6))
781 return 0;
782 /* signature lower, pkey */
783 if (memcmp(addr + 7, broadcast + 7, 3))
784 return 0;
785 return 1;
786 }
787
788 void ipoib_mcast_restart_task(struct work_struct *work)
789 {
790 struct ipoib_dev_priv *priv =
791 container_of(work, struct ipoib_dev_priv, restart_task);
792 struct net_device *dev = priv->dev;
793 struct netdev_hw_addr *ha;
794 struct ipoib_mcast *mcast, *tmcast;
795 LIST_HEAD(remove_list);
796 unsigned long flags;
797 struct ib_sa_mcmember_rec rec;
798
799 ipoib_dbg_mcast(priv, "restarting multicast task\n");
800
801 ipoib_mcast_stop_thread(dev, 0);
802
803 local_irq_save(flags);
804 netif_addr_lock(dev);
805 spin_lock(&priv->lock);
806
807 /*
808 * Unfortunately, the networking core only gives us a list of all of
809 * the multicast hardware addresses. We need to figure out which ones
810 * are new and which ones have been removed
811 */
812
813 /* Clear out the found flag */
814 list_for_each_entry(mcast, &priv->multicast_list, list)
815 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
816
817 /* Mark all of the entries that are found or don't exist */
818 netdev_for_each_mc_addr(ha, dev) {
819 union ib_gid mgid;
820
821 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
822 continue;
823
824 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
825
826 mcast = __ipoib_mcast_find(dev, &mgid);
827 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
828 struct ipoib_mcast *nmcast;
829
830 /* ignore group which is directly joined by userspace */
831 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
832 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
833 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
834 mgid.raw);
835 continue;
836 }
837
838 /* Not found or send-only group, let's add a new entry */
839 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
840 mgid.raw);
841
842 nmcast = ipoib_mcast_alloc(dev, 0);
843 if (!nmcast) {
844 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
845 continue;
846 }
847
848 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
849
850 nmcast->mcmember.mgid = mgid;
851
852 if (mcast) {
853 /* Destroy the send only entry */
854 list_move_tail(&mcast->list, &remove_list);
855
856 rb_replace_node(&mcast->rb_node,
857 &nmcast->rb_node,
858 &priv->multicast_tree);
859 } else
860 __ipoib_mcast_add(dev, nmcast);
861
862 list_add_tail(&nmcast->list, &priv->multicast_list);
863 }
864
865 if (mcast)
866 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
867 }
868
869 /* Remove all of the entries don't exist anymore */
870 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
871 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
872 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
873 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
874 mcast->mcmember.mgid.raw);
875
876 rb_erase(&mcast->rb_node, &priv->multicast_tree);
877
878 /* Move to the remove list */
879 list_move_tail(&mcast->list, &remove_list);
880 }
881 }
882
883 spin_unlock(&priv->lock);
884 netif_addr_unlock(dev);
885 local_irq_restore(flags);
886
887 /* We have to cancel outside of the spinlock */
888 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
889 ipoib_mcast_leave(mcast->dev, mcast);
890 ipoib_mcast_free(mcast);
891 }
892
893 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
894 ipoib_mcast_start_thread(dev);
895 }
896
897 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
898
899 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
900 {
901 struct ipoib_mcast_iter *iter;
902
903 iter = kmalloc(sizeof *iter, GFP_KERNEL);
904 if (!iter)
905 return NULL;
906
907 iter->dev = dev;
908 memset(iter->mgid.raw, 0, 16);
909
910 if (ipoib_mcast_iter_next(iter)) {
911 kfree(iter);
912 return NULL;
913 }
914
915 return iter;
916 }
917
918 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
919 {
920 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
921 struct rb_node *n;
922 struct ipoib_mcast *mcast;
923 int ret = 1;
924
925 spin_lock_irq(&priv->lock);
926
927 n = rb_first(&priv->multicast_tree);
928
929 while (n) {
930 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
931
932 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
933 sizeof (union ib_gid)) < 0) {
934 iter->mgid = mcast->mcmember.mgid;
935 iter->created = mcast->created;
936 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
937 iter->complete = !!mcast->ah;
938 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
939
940 ret = 0;
941
942 break;
943 }
944
945 n = rb_next(n);
946 }
947
948 spin_unlock_irq(&priv->lock);
949
950 return ret;
951 }
952
953 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
954 union ib_gid *mgid,
955 unsigned long *created,
956 unsigned int *queuelen,
957 unsigned int *complete,
958 unsigned int *send_only)
959 {
960 *mgid = iter->mgid;
961 *created = iter->created;
962 *queuelen = iter->queuelen;
963 *complete = iter->complete;
964 *send_only = iter->send_only;
965 }
966
967 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux kernel - Deliverables
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