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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / infiniband / ulp / ipoib / ipoib_multicast.c
blob86e4ed64e4e21b6182bf2be0a5ccafe9f4864960
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/moduleparam.h>
38 #include <linux/ip.h>
39 #include <linux/in.h>
40 #include <linux/igmp.h>
41 #include <linux/inetdevice.h>
42 #include <linux/delay.h>
43 #include <linux/completion.h>
44 #include <linux/slab.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 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 /* join state that allows creating mcg with sendonly member request */
68 #define SENDONLY_FULLMEMBER_JOIN 8
69
70 /*
71 * This should be called with the priv->lock held
72 */
73 static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv,
74 struct ipoib_mcast *mcast,
75 bool delay)
76 {
77 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
78 return;
79
80 /*
81 * We will be scheduling *something*, so cancel whatever is
82 * currently scheduled first
83 */
84 cancel_delayed_work(&priv->mcast_task);
85 if (mcast && delay) {
86 /*
87 * We had a failure and want to schedule a retry later
88 */
89 mcast->backoff *= 2;
90 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
91 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
92 mcast->delay_until = jiffies + (mcast->backoff * HZ);
93 /*
94 * Mark this mcast for its delay, but restart the
95 * task immediately. The join task will make sure to
96 * clear out all entries without delays, and then
97 * schedule itself to run again when the earliest
98 * delay expires
99 */
100 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
101 } else if (delay) {
102 /*
103 * Special case of retrying after a failure to
104 * allocate the broadcast multicast group, wait
105 * 1 second and try again
106 */
107 queue_delayed_work(priv->wq, &priv->mcast_task, HZ);
108 } else
109 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
110 }
111
112 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
113 {
114 struct net_device *dev = mcast->dev;
115 int tx_dropped = 0;
116
117 ipoib_dbg_mcast(ipoib_priv(dev), "deleting multicast group %pI6\n",
118 mcast->mcmember.mgid.raw);
119
120 /* remove all neigh connected to this mcast */
121 ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);
122
123 if (mcast->ah)
124 ipoib_put_ah(mcast->ah);
125
126 while (!skb_queue_empty(&mcast->pkt_queue)) {
127 ++tx_dropped;
128 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
129 }
130
131 netif_tx_lock_bh(dev);
132 dev->stats.tx_dropped += tx_dropped;
133 netif_tx_unlock_bh(dev);
134
135 kfree(mcast);
136 }
137
138 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev)
139 {
140 struct ipoib_mcast *mcast;
141
142 mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC);
143 if (!mcast)
144 return NULL;
145
146 mcast->dev = dev;
147 mcast->created = jiffies;
148 mcast->delay_until = jiffies;
149 mcast->backoff = 1;
150
151 INIT_LIST_HEAD(&mcast->list);
152 INIT_LIST_HEAD(&mcast->neigh_list);
153 skb_queue_head_init(&mcast->pkt_queue);
154
155 return mcast;
156 }
157
158 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
159 {
160 struct ipoib_dev_priv *priv = ipoib_priv(dev);
161 struct rb_node *n = priv->multicast_tree.rb_node;
162
163 while (n) {
164 struct ipoib_mcast *mcast;
165 int ret;
166
167 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
168
169 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
170 sizeof (union ib_gid));
171 if (ret < 0)
172 n = n->rb_left;
173 else if (ret > 0)
174 n = n->rb_right;
175 else
176 return mcast;
177 }
178
179 return NULL;
180 }
181
182 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
183 {
184 struct ipoib_dev_priv *priv = ipoib_priv(dev);
185 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
186
187 while (*n) {
188 struct ipoib_mcast *tmcast;
189 int ret;
190
191 pn = *n;
192 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
193
194 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
195 sizeof (union ib_gid));
196 if (ret < 0)
197 n = &pn->rb_left;
198 else if (ret > 0)
199 n = &pn->rb_right;
200 else
201 return -EEXIST;
202 }
203
204 rb_link_node(&mcast->rb_node, pn, n);
205 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
206
207 return 0;
208 }
209
210 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
211 struct ib_sa_mcmember_rec *mcmember)
212 {
213 struct net_device *dev = mcast->dev;
214 struct ipoib_dev_priv *priv = ipoib_priv(dev);
215 struct rdma_netdev *rn = netdev_priv(dev);
216 struct ipoib_ah *ah;
217 struct rdma_ah_attr av;
218 int ret;
219 int set_qkey = 0;
220 int mtu;
221
222 mcast->mcmember = *mcmember;
223
224 /* Set the multicast MTU and cached Q_Key before we attach if it's
225 * the broadcast group.
226 */
227 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
228 sizeof (union ib_gid))) {
229 spin_lock_irq(&priv->lock);
230 if (!priv->broadcast) {
231 spin_unlock_irq(&priv->lock);
232 return -EAGAIN;
233 }
234 /*update priv member according to the new mcast*/
235 priv->broadcast->mcmember.qkey = mcmember->qkey;
236 priv->broadcast->mcmember.mtu = mcmember->mtu;
237 priv->broadcast->mcmember.traffic_class = mcmember->traffic_class;
238 priv->broadcast->mcmember.rate = mcmember->rate;
239 priv->broadcast->mcmember.sl = mcmember->sl;
240 priv->broadcast->mcmember.flow_label = mcmember->flow_label;
241 priv->broadcast->mcmember.hop_limit = mcmember->hop_limit;
242 /* assume if the admin and the mcast are the same both can be changed */
243 mtu = rdma_mtu_enum_to_int(priv->ca, priv->port,
244 priv->broadcast->mcmember.mtu);
245 if (priv->mcast_mtu == priv->admin_mtu)
246 priv->admin_mtu = IPOIB_UD_MTU(mtu);
247 priv->mcast_mtu = IPOIB_UD_MTU(mtu);
248 rn->mtu = priv->mcast_mtu;
249
250 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
251 spin_unlock_irq(&priv->lock);
252 priv->tx_wr.remote_qkey = priv->qkey;
253 set_qkey = 1;
254 }
255
256 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
257 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
258 ipoib_warn(priv, "multicast group %pI6 already attached\n",
259 mcast->mcmember.mgid.raw);
260
261 return 0;
262 }
263
264 ret = rn->attach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
265 be16_to_cpu(mcast->mcmember.mlid),
266 set_qkey, priv->qkey);
267 if (ret < 0) {
268 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
269 mcast->mcmember.mgid.raw);
270
271 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
272 return ret;
273 }
274 }
275
276 memset(&av, 0, sizeof(av));
277 av.type = rdma_ah_find_type(priv->ca, priv->port);
278 rdma_ah_set_dlid(&av, be16_to_cpu(mcast->mcmember.mlid)),
279 rdma_ah_set_port_num(&av, priv->port);
280 rdma_ah_set_sl(&av, mcast->mcmember.sl);
281 rdma_ah_set_static_rate(&av, mcast->mcmember.rate);
282
283 rdma_ah_set_grh(&av, &mcast->mcmember.mgid,
284 be32_to_cpu(mcast->mcmember.flow_label),
285 0, mcast->mcmember.hop_limit,
286 mcast->mcmember.traffic_class);
287
288 ah = ipoib_create_ah(dev, priv->pd, &av);
289 if (IS_ERR(ah)) {
290 ipoib_warn(priv, "ib_address_create failed %ld\n",
291 -PTR_ERR(ah));
292 /* use original error */
293 return PTR_ERR(ah);
294 }
295 spin_lock_irq(&priv->lock);
296 mcast->ah = ah;
297 spin_unlock_irq(&priv->lock);
298
299 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
300 mcast->mcmember.mgid.raw,
301 mcast->ah->ah,
302 be16_to_cpu(mcast->mcmember.mlid),
303 mcast->mcmember.sl);
304
305 /* actually send any queued packets */
306 netif_tx_lock_bh(dev);
307 while (!skb_queue_empty(&mcast->pkt_queue)) {
308 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
309
310 netif_tx_unlock_bh(dev);
311
312 skb->dev = dev;
313
314 ret = dev_queue_xmit(skb);
315 if (ret)
316 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
317 __func__, ret);
318 netif_tx_lock_bh(dev);
319 }
320 netif_tx_unlock_bh(dev);
321
322 return 0;
323 }
324
325 void ipoib_mcast_carrier_on_task(struct work_struct *work)
326 {
327 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
328 carrier_on_task);
329 struct ib_port_attr attr;
330
331 if (ib_query_port(priv->ca, priv->port, &attr) ||
332 attr.state != IB_PORT_ACTIVE) {
333 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
334 return;
335 }
336 /*
337 * Check if can send sendonly MCG's with sendonly-fullmember join state.
338 * It done here after the successfully join to the broadcast group,
339 * because the broadcast group must always be joined first and is always
340 * re-joined if the SM changes substantially.
341 */
342 priv->sm_fullmember_sendonly_support =
343 ib_sa_sendonly_fullmem_support(&ipoib_sa_client,
344 priv->ca, priv->port);
345 /*
346 * Take rtnl_lock to avoid racing with ipoib_stop() and
347 * turning the carrier back on while a device is being
348 * removed. However, ipoib_stop() will attempt to flush
349 * the workqueue while holding the rtnl lock, so loop
350 * on trylock until either we get the lock or we see
351 * FLAG_OPER_UP go away as that signals that we are bailing
352 * and can safely ignore the carrier on work.
353 */
354 while (!rtnl_trylock()) {
355 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
356 return;
357 else
358 msleep(20);
359 }
360 if (!ipoib_cm_admin_enabled(priv->dev))
361 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
362 netif_carrier_on(priv->dev);
363 rtnl_unlock();
364 }
365
366 static int ipoib_mcast_join_complete(int status,
367 struct ib_sa_multicast *multicast)
368 {
369 struct ipoib_mcast *mcast = multicast->context;
370 struct net_device *dev = mcast->dev;
371 struct ipoib_dev_priv *priv = ipoib_priv(dev);
372
373 ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
374 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
375 "sendonly " : "",
376 mcast->mcmember.mgid.raw, status);
377
378 /* We trap for port events ourselves. */
379 if (status == -ENETRESET) {
380 status = 0;
381 goto out;
382 }
383
384 if (!status)
385 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
386
387 if (!status) {
388 mcast->backoff = 1;
389 mcast->delay_until = jiffies;
390
391 /*
392 * Defer carrier on work to priv->wq to avoid a
393 * deadlock on rtnl_lock here. Requeue our multicast
394 * work too, which will end up happening right after
395 * our carrier on task work and will allow us to
396 * send out all of the non-broadcast joins
397 */
398 if (mcast == priv->broadcast) {
399 spin_lock_irq(&priv->lock);
400 queue_work(priv->wq, &priv->carrier_on_task);
401 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
402 goto out_locked;
403 }
404 } else {
405 bool silent_fail =
406 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
407 status == -EINVAL;
408
409 if (mcast->logcount < 20) {
410 if (status == -ETIMEDOUT || status == -EAGAIN ||
411 silent_fail) {
412 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
413 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
414 mcast->mcmember.mgid.raw, status);
415 } else {
416 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
417 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
418 mcast->mcmember.mgid.raw, status);
419 }
420
421 if (!silent_fail)
422 mcast->logcount++;
423 }
424
425 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
426 mcast->backoff >= 2) {
427 /*
428 * We only retry sendonly joins once before we drop
429 * the packet and quit trying to deal with the
430 * group. However, we leave the group in the
431 * mcast list as an unjoined group. If we want to
432 * try joining again, we simply queue up a packet
433 * and restart the join thread. The empty queue
434 * is why the join thread ignores this group.
435 */
436 mcast->backoff = 1;
437 netif_tx_lock_bh(dev);
438 while (!skb_queue_empty(&mcast->pkt_queue)) {
439 ++dev->stats.tx_dropped;
440 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
441 }
442 netif_tx_unlock_bh(dev);
443 } else {
444 spin_lock_irq(&priv->lock);
445 /* Requeue this join task with a backoff delay */
446 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
447 goto out_locked;
448 }
449 }
450 out:
451 spin_lock_irq(&priv->lock);
452 out_locked:
453 /*
454 * Make sure to set mcast->mc before we clear the busy flag to avoid
455 * racing with code that checks for BUSY before checking mcast->mc
456 */
457 if (status)
458 mcast->mc = NULL;
459 else
460 mcast->mc = multicast;
461 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
462 spin_unlock_irq(&priv->lock);
463 complete(&mcast->done);
464
465 return status;
466 }
467
468 /*
469 * Caller must hold 'priv->lock'
470 */
471 static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
472 {
473 struct ipoib_dev_priv *priv = ipoib_priv(dev);
474 struct ib_sa_multicast *multicast;
475 struct ib_sa_mcmember_rec rec = {
476 .join_state = 1
477 };
478 ib_sa_comp_mask comp_mask;
479 int ret = 0;
480
481 if (!priv->broadcast ||
482 !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
483 return -EINVAL;
484
485 init_completion(&mcast->done);
486 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
487
488 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
489
490 rec.mgid = mcast->mcmember.mgid;
491 rec.port_gid = priv->local_gid;
492 rec.pkey = cpu_to_be16(priv->pkey);
493
494 comp_mask =
495 IB_SA_MCMEMBER_REC_MGID |
496 IB_SA_MCMEMBER_REC_PORT_GID |
497 IB_SA_MCMEMBER_REC_PKEY |
498 IB_SA_MCMEMBER_REC_JOIN_STATE;
499
500 if (mcast != priv->broadcast) {
501 /*
502 * RFC 4391:
503 * The MGID MUST use the same P_Key, Q_Key, SL, MTU,
504 * and HopLimit as those used in the broadcast-GID. The rest
505 * of attributes SHOULD follow the values used in the
506 * broadcast-GID as well.
507 */
508 comp_mask |=
509 IB_SA_MCMEMBER_REC_QKEY |
510 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
511 IB_SA_MCMEMBER_REC_MTU |
512 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
513 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
514 IB_SA_MCMEMBER_REC_RATE |
515 IB_SA_MCMEMBER_REC_SL |
516 IB_SA_MCMEMBER_REC_FLOW_LABEL |
517 IB_SA_MCMEMBER_REC_HOP_LIMIT;
518
519 rec.qkey = priv->broadcast->mcmember.qkey;
520 rec.mtu_selector = IB_SA_EQ;
521 rec.mtu = priv->broadcast->mcmember.mtu;
522 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
523 rec.rate_selector = IB_SA_EQ;
524 rec.rate = priv->broadcast->mcmember.rate;
525 rec.sl = priv->broadcast->mcmember.sl;
526 rec.flow_label = priv->broadcast->mcmember.flow_label;
527 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
528
529 /*
530 * Send-only IB Multicast joins work at the core IB layer but
531 * require specific SM support.
532 * We can use such joins here only if the current SM supports that feature.
533 * However, if not, we emulate an Ethernet multicast send,
534 * which does not require a multicast subscription and will
535 * still send properly. The most appropriate thing to
536 * do is to create the group if it doesn't exist as that
537 * most closely emulates the behavior, from a user space
538 * application perspective, of Ethernet multicast operation.
539 */
540 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
541 priv->sm_fullmember_sendonly_support)
542 /* SM supports sendonly-fullmember, otherwise fallback to full-member */
543 rec.join_state = SENDONLY_FULLMEMBER_JOIN;
544 }
545 spin_unlock_irq(&priv->lock);
546
547 multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
548 &rec, comp_mask, GFP_KERNEL,
549 ipoib_mcast_join_complete, mcast);
550 spin_lock_irq(&priv->lock);
551 if (IS_ERR(multicast)) {
552 ret = PTR_ERR(multicast);
553 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
554 /* Requeue this join task with a backoff delay */
555 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
556 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
557 spin_unlock_irq(&priv->lock);
558 complete(&mcast->done);
559 spin_lock_irq(&priv->lock);
560 }
561 return 0;
562 }
563
564 void ipoib_mcast_join_task(struct work_struct *work)
565 {
566 struct ipoib_dev_priv *priv =
567 container_of(work, struct ipoib_dev_priv, mcast_task.work);
568 struct net_device *dev = priv->dev;
569 struct ib_port_attr port_attr;
570 unsigned long delay_until = 0;
571 struct ipoib_mcast *mcast = NULL;
572
573 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
574 return;
575
576 if (ib_query_port(priv->ca, priv->port, &port_attr)) {
577 ipoib_dbg(priv, "ib_query_port() failed\n");
578 return;
579 }
580 if (port_attr.state != IB_PORT_ACTIVE) {
581 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
582 port_attr.state);
583 return;
584 }
585 priv->local_lid = port_attr.lid;
586 netif_addr_lock_bh(dev);
587
588 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
589 netif_addr_unlock_bh(dev);
590 return;
591 }
592 netif_addr_unlock_bh(dev);
593
594 spin_lock_irq(&priv->lock);
595 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
596 goto out;
597
598 if (!priv->broadcast) {
599 struct ipoib_mcast *broadcast;
600
601 broadcast = ipoib_mcast_alloc(dev);
602 if (!broadcast) {
603 ipoib_warn(priv, "failed to allocate broadcast group\n");
604 /*
605 * Restart us after a 1 second delay to retry
606 * creating our broadcast group and attaching to
607 * it. Until this succeeds, this ipoib dev is
608 * completely stalled (multicast wise).
609 */
610 __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
611 goto out;
612 }
613
614 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
615 sizeof (union ib_gid));
616 priv->broadcast = broadcast;
617
618 __ipoib_mcast_add(dev, priv->broadcast);
619 }
620
621 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
622 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
623 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
624 mcast = priv->broadcast;
625 if (mcast->backoff > 1 &&
626 time_before(jiffies, mcast->delay_until)) {
627 delay_until = mcast->delay_until;
628 mcast = NULL;
629 }
630 }
631 goto out;
632 }
633
634 /*
635 * We'll never get here until the broadcast group is both allocated
636 * and attached
637 */
638 list_for_each_entry(mcast, &priv->multicast_list, list) {
639 if (IS_ERR_OR_NULL(mcast->mc) &&
640 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
641 (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
642 !skb_queue_empty(&mcast->pkt_queue))) {
643 if (mcast->backoff == 1 ||
644 time_after_eq(jiffies, mcast->delay_until)) {
645 /* Found the next unjoined group */
646 if (ipoib_mcast_join(dev, mcast)) {
647 spin_unlock_irq(&priv->lock);
648 return;
649 }
650 } else if (!delay_until ||
651 time_before(mcast->delay_until, delay_until))
652 delay_until = mcast->delay_until;
653 }
654 }
655
656 mcast = NULL;
657 ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
658
659 out:
660 if (delay_until) {
661 cancel_delayed_work(&priv->mcast_task);
662 queue_delayed_work(priv->wq, &priv->mcast_task,
663 delay_until - jiffies);
664 }
665 if (mcast)
666 ipoib_mcast_join(dev, mcast);
667
668 spin_unlock_irq(&priv->lock);
669 }
670
671 void ipoib_mcast_start_thread(struct net_device *dev)
672 {
673 struct ipoib_dev_priv *priv = ipoib_priv(dev);
674 unsigned long flags;
675
676 ipoib_dbg_mcast(priv, "starting multicast thread\n");
677
678 spin_lock_irqsave(&priv->lock, flags);
679 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
680 spin_unlock_irqrestore(&priv->lock, flags);
681 }
682
683 void ipoib_mcast_stop_thread(struct net_device *dev)
684 {
685 struct ipoib_dev_priv *priv = ipoib_priv(dev);
686
687 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
688
689 cancel_delayed_work_sync(&priv->mcast_task);
690 }
691
692 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
693 {
694 struct ipoib_dev_priv *priv = ipoib_priv(dev);
695 struct rdma_netdev *rn = netdev_priv(dev);
696 int ret = 0;
697
698 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
699 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
700
701 if (!IS_ERR_OR_NULL(mcast->mc))
702 ib_sa_free_multicast(mcast->mc);
703
704 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
705 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
706 mcast->mcmember.mgid.raw);
707
708 /* Remove ourselves from the multicast group */
709 ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
710 be16_to_cpu(mcast->mcmember.mlid));
711 if (ret)
712 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
713 } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
714 ipoib_dbg(priv, "leaving with no mcmember but not a "
715 "SENDONLY join\n");
716
717 return 0;
718 }
719
720 /*
721 * Check if the multicast group is sendonly. If so remove it from the maps
722 * and add to the remove list
723 */
724 void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
725 struct list_head *remove_list)
726 {
727 /* Is this multicast ? */
728 if (*mgid == 0xff) {
729 struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid);
730
731 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
732 list_del(&mcast->list);
733 rb_erase(&mcast->rb_node, &priv->multicast_tree);
734 list_add_tail(&mcast->list, remove_list);
735 }
736 }
737 }
738
739 void ipoib_mcast_remove_list(struct list_head *remove_list)
740 {
741 struct ipoib_mcast *mcast, *tmcast;
742
743 /*
744 * make sure the in-flight joins have finished before we attempt
745 * to leave
746 */
747 list_for_each_entry_safe(mcast, tmcast, remove_list, list)
748 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
749 wait_for_completion(&mcast->done);
750
751 list_for_each_entry_safe(mcast, tmcast, remove_list, list) {
752 ipoib_mcast_leave(mcast->dev, mcast);
753 ipoib_mcast_free(mcast);
754 }
755 }
756
757 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
758 {
759 struct ipoib_dev_priv *priv = ipoib_priv(dev);
760 struct rdma_netdev *rn = netdev_priv(dev);
761 struct ipoib_mcast *mcast;
762 unsigned long flags;
763 void *mgid = daddr + 4;
764
765 spin_lock_irqsave(&priv->lock, flags);
766
767 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
768 !priv->broadcast ||
769 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
770 ++dev->stats.tx_dropped;
771 dev_kfree_skb_any(skb);
772 goto unlock;
773 }
774
775 mcast = __ipoib_mcast_find(dev, mgid);
776 if (!mcast || !mcast->ah) {
777 if (!mcast) {
778 /* Let's create a new send only group now */
779 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
780 mgid);
781
782 mcast = ipoib_mcast_alloc(dev);
783 if (!mcast) {
784 ipoib_warn(priv, "unable to allocate memory "
785 "for multicast structure\n");
786 ++dev->stats.tx_dropped;
787 dev_kfree_skb_any(skb);
788 goto unlock;
789 }
790
791 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
792 memcpy(mcast->mcmember.mgid.raw, mgid,
793 sizeof (union ib_gid));
794 __ipoib_mcast_add(dev, mcast);
795 list_add_tail(&mcast->list, &priv->multicast_list);
796 }
797 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) {
798 /* put pseudoheader back on for next time */
799 skb_push(skb, sizeof(struct ipoib_pseudo_header));
800 skb_queue_tail(&mcast->pkt_queue, skb);
801 } else {
802 ++dev->stats.tx_dropped;
803 dev_kfree_skb_any(skb);
804 }
805 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
806 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
807 }
808 } else {
809 struct ipoib_neigh *neigh;
810
811 spin_unlock_irqrestore(&priv->lock, flags);
812 neigh = ipoib_neigh_get(dev, daddr);
813 spin_lock_irqsave(&priv->lock, flags);
814 if (!neigh) {
815 neigh = ipoib_neigh_alloc(daddr, dev);
816 /* Make sure that the neigh will be added only
817 * once to mcast list.
818 */
819 if (neigh && list_empty(&neigh->list)) {
820 kref_get(&mcast->ah->ref);
821 neigh->ah = mcast->ah;
822 neigh->ah->valid = 1;
823 list_add_tail(&neigh->list, &mcast->neigh_list);
824 }
825 }
826 spin_unlock_irqrestore(&priv->lock, flags);
827 mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah,
828 IB_MULTICAST_QPN);
829 if (neigh)
830 ipoib_neigh_put(neigh);
831 return;
832 }
833
834 unlock:
835 spin_unlock_irqrestore(&priv->lock, flags);
836 }
837
838 void ipoib_mcast_dev_flush(struct net_device *dev)
839 {
840 struct ipoib_dev_priv *priv = ipoib_priv(dev);
841 LIST_HEAD(remove_list);
842 struct ipoib_mcast *mcast, *tmcast;
843 unsigned long flags;
844
845 mutex_lock(&priv->mcast_mutex);
846 ipoib_dbg_mcast(priv, "flushing multicast list\n");
847
848 spin_lock_irqsave(&priv->lock, flags);
849
850 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
851 list_del(&mcast->list);
852 rb_erase(&mcast->rb_node, &priv->multicast_tree);
853 list_add_tail(&mcast->list, &remove_list);
854 }
855
856 if (priv->broadcast) {
857 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
858 list_add_tail(&priv->broadcast->list, &remove_list);
859 priv->broadcast = NULL;
860 }
861
862 spin_unlock_irqrestore(&priv->lock, flags);
863
864 ipoib_mcast_remove_list(&remove_list);
865 mutex_unlock(&priv->mcast_mutex);
866 }
867
868 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
869 {
870 /* reserved QPN, prefix, scope */
871 if (memcmp(addr, broadcast, 6))
872 return 0;
873 /* signature lower, pkey */
874 if (memcmp(addr + 7, broadcast + 7, 3))
875 return 0;
876 return 1;
877 }
878
879 void ipoib_mcast_restart_task(struct work_struct *work)
880 {
881 struct ipoib_dev_priv *priv =
882 container_of(work, struct ipoib_dev_priv, restart_task);
883 struct net_device *dev = priv->dev;
884 struct netdev_hw_addr *ha;
885 struct ipoib_mcast *mcast, *tmcast;
886 LIST_HEAD(remove_list);
887 struct ib_sa_mcmember_rec rec;
888
889 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
890 /*
891 * shortcut...on shutdown flush is called next, just
892 * let it do all the work
893 */
894 return;
895
896 ipoib_dbg_mcast(priv, "restarting multicast task\n");
897
898 netif_addr_lock_bh(dev);
899 spin_lock_irq(&priv->lock);
900
901 /*
902 * Unfortunately, the networking core only gives us a list of all of
903 * the multicast hardware addresses. We need to figure out which ones
904 * are new and which ones have been removed
905 */
906
907 /* Clear out the found flag */
908 list_for_each_entry(mcast, &priv->multicast_list, list)
909 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
910
911 /* Mark all of the entries that are found or don't exist */
912 netdev_for_each_mc_addr(ha, dev) {
913 union ib_gid mgid;
914
915 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
916 continue;
917
918 memcpy(mgid.raw, ha->addr + 4, sizeof(mgid));
919
920 mcast = __ipoib_mcast_find(dev, &mgid);
921 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
922 struct ipoib_mcast *nmcast;
923
924 /* ignore group which is directly joined by userspace */
925 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
926 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
927 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
928 mgid.raw);
929 continue;
930 }
931
932 /* Not found or send-only group, let's add a new entry */
933 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
934 mgid.raw);
935
936 nmcast = ipoib_mcast_alloc(dev);
937 if (!nmcast) {
938 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
939 continue;
940 }
941
942 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
943
944 nmcast->mcmember.mgid = mgid;
945
946 if (mcast) {
947 /* Destroy the send only entry */
948 list_move_tail(&mcast->list, &remove_list);
949
950 rb_replace_node(&mcast->rb_node,
951 &nmcast->rb_node,
952 &priv->multicast_tree);
953 } else
954 __ipoib_mcast_add(dev, nmcast);
955
956 list_add_tail(&nmcast->list, &priv->multicast_list);
957 }
958
959 if (mcast)
960 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
961 }
962
963 /* Remove all of the entries don't exist anymore */
964 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
965 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
966 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
967 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
968 mcast->mcmember.mgid.raw);
969
970 rb_erase(&mcast->rb_node, &priv->multicast_tree);
971
972 /* Move to the remove list */
973 list_move_tail(&mcast->list, &remove_list);
974 }
975 }
976
977 spin_unlock_irq(&priv->lock);
978 netif_addr_unlock_bh(dev);
979
980 ipoib_mcast_remove_list(&remove_list);
981
982 /*
983 * Double check that we are still up
984 */
985 if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
986 spin_lock_irq(&priv->lock);
987 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
988 spin_unlock_irq(&priv->lock);
989 }
990 }
991
992 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
993
994 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
995 {
996 struct ipoib_mcast_iter *iter;
997
998 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
999 if (!iter)
1000 return NULL;
1001
1002 iter->dev = dev;
1003 memset(iter->mgid.raw, 0, 16);
1004
1005 if (ipoib_mcast_iter_next(iter)) {
1006 kfree(iter);
1007 return NULL;
1008 }
1009
1010 return iter;
1011 }
1012
1013 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
1014 {
1015 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
1016 struct rb_node *n;
1017 struct ipoib_mcast *mcast;
1018 int ret = 1;
1019
1020 spin_lock_irq(&priv->lock);
1021
1022 n = rb_first(&priv->multicast_tree);
1023
1024 while (n) {
1025 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
1026
1027 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
1028 sizeof (union ib_gid)) < 0) {
1029 iter->mgid = mcast->mcmember.mgid;
1030 iter->created = mcast->created;
1031 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
1032 iter->complete = !!mcast->ah;
1033 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1034
1035 ret = 0;
1036
1037 break;
1038 }
1039
1040 n = rb_next(n);
1041 }
1042
1043 spin_unlock_irq(&priv->lock);
1044
1045 return ret;
1046 }
1047
1048 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1049 union ib_gid *mgid,
1050 unsigned long *created,
1051 unsigned int *queuelen,
1052 unsigned int *complete,
1053 unsigned int *send_only)
1054 {
1055 *mgid = iter->mgid;
1056 *created = iter->created;
1057 *queuelen = iter->queuelen;
1058 *complete = iter->complete;
1059 *send_only = iter->send_only;
1060 }
1061
1062 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux with added FPC-III support