xref: /linux/drivers/infiniband/ulp/ipoib/ipoib_multicast.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
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  */
__ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv * priv,struct ipoib_mcast * mcast,bool delay)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 
ipoib_mcast_free(struct ipoib_mcast * mcast)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 
ipoib_mcast_alloc(struct net_device * dev)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 
__ipoib_mcast_find(struct net_device * dev,void * mgid)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 
__ipoib_mcast_add(struct net_device * dev,struct ipoib_mcast * mcast)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 
ipoib_mcast_join_finish(struct ipoib_mcast * mcast,struct ib_sa_mcmember_rec * mcmember)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 %pe\n", ah);
291 		/* use original error */
292 		return PTR_ERR(ah);
293 	}
294 	spin_lock_irq(&priv->lock);
295 	mcast->ah = ah;
296 	spin_unlock_irq(&priv->lock);
297 
298 	ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
299 			mcast->mcmember.mgid.raw,
300 			mcast->ah->ah,
301 			be16_to_cpu(mcast->mcmember.mlid),
302 			mcast->mcmember.sl);
303 
304 	/* actually send any queued packets */
305 	netif_tx_lock_bh(dev);
306 	while (!skb_queue_empty(&mcast->pkt_queue)) {
307 		struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
308 
309 		netif_tx_unlock_bh(dev);
310 
311 		skb->dev = dev;
312 
313 		ret = dev_queue_xmit(skb);
314 		if (ret)
315 			ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
316 				   __func__, ret);
317 		netif_tx_lock_bh(dev);
318 	}
319 	netif_tx_unlock_bh(dev);
320 
321 	return 0;
322 }
323 
ipoib_mcast_carrier_on_task(struct work_struct * work)324 void ipoib_mcast_carrier_on_task(struct work_struct *work)
325 {
326 	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
327 						   carrier_on_task);
328 	struct ib_port_attr attr;
329 
330 	if (ib_query_port(priv->ca, priv->port, &attr) ||
331 	    attr.state != IB_PORT_ACTIVE) {
332 		ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
333 		return;
334 	}
335 	/*
336 	 * Take rtnl_lock to avoid racing with ipoib_stop() and
337 	 * turning the carrier back on while a device is being
338 	 * removed.  However, ipoib_stop() will attempt to flush
339 	 * the workqueue while holding the rtnl lock, so loop
340 	 * on trylock until either we get the lock or we see
341 	 * FLAG_OPER_UP go away as that signals that we are bailing
342 	 * and can safely ignore the carrier on work.
343 	 */
344 	while (!rtnl_trylock()) {
345 		if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
346 			return;
347 		else
348 			msleep(20);
349 	}
350 	if (!ipoib_cm_admin_enabled(priv->dev))
351 		dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
352 	netif_carrier_on(priv->dev);
353 	rtnl_unlock();
354 }
355 
ipoib_mcast_join_complete(int status,struct ib_sa_multicast * multicast)356 static int ipoib_mcast_join_complete(int status,
357 				     struct ib_sa_multicast *multicast)
358 {
359 	struct ipoib_mcast *mcast = multicast->context;
360 	struct net_device *dev = mcast->dev;
361 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
362 
363 	ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
364 			test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
365 			"sendonly " : "",
366 			mcast->mcmember.mgid.raw, status);
367 
368 	/* We trap for port events ourselves. */
369 	if (status == -ENETRESET) {
370 		status = 0;
371 		goto out;
372 	}
373 
374 	if (!status)
375 		status = ipoib_mcast_join_finish(mcast, &multicast->rec);
376 
377 	if (!status) {
378 		mcast->backoff = 1;
379 		mcast->delay_until = jiffies;
380 
381 		/*
382 		 * Defer carrier on work to priv->wq to avoid a
383 		 * deadlock on rtnl_lock here.  Requeue our multicast
384 		 * work too, which will end up happening right after
385 		 * our carrier on task work and will allow us to
386 		 * send out all of the non-broadcast joins
387 		 */
388 		if (mcast == priv->broadcast) {
389 			spin_lock_irq(&priv->lock);
390 			queue_work(priv->wq, &priv->carrier_on_task);
391 			__ipoib_mcast_schedule_join_thread(priv, NULL, 0);
392 			goto out_locked;
393 		}
394 	} else {
395 		bool silent_fail =
396 		    test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
397 		    status == -EINVAL;
398 
399 		if (mcast->logcount < 20) {
400 			if (status == -ETIMEDOUT || status == -EAGAIN ||
401 			    silent_fail) {
402 				ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
403 						test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
404 						mcast->mcmember.mgid.raw, status);
405 			} else {
406 				ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
407 						test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
408 					   mcast->mcmember.mgid.raw, status);
409 			}
410 
411 			if (!silent_fail)
412 				mcast->logcount++;
413 		}
414 
415 		if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
416 		    mcast->backoff >= 2) {
417 			/*
418 			 * We only retry sendonly joins once before we drop
419 			 * the packet and quit trying to deal with the
420 			 * group.  However, we leave the group in the
421 			 * mcast list as an unjoined group.  If we want to
422 			 * try joining again, we simply queue up a packet
423 			 * and restart the join thread.  The empty queue
424 			 * is why the join thread ignores this group.
425 			 */
426 			mcast->backoff = 1;
427 			netif_tx_lock_bh(dev);
428 			while (!skb_queue_empty(&mcast->pkt_queue)) {
429 				++dev->stats.tx_dropped;
430 				dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
431 			}
432 			netif_tx_unlock_bh(dev);
433 		} else {
434 			spin_lock_irq(&priv->lock);
435 			/* Requeue this join task with a backoff delay */
436 			__ipoib_mcast_schedule_join_thread(priv, mcast, 1);
437 			goto out_locked;
438 		}
439 	}
440 out:
441 	spin_lock_irq(&priv->lock);
442 out_locked:
443 	/*
444 	 * Make sure to set mcast->mc before we clear the busy flag to avoid
445 	 * racing with code that checks for BUSY before checking mcast->mc
446 	 */
447 	if (status)
448 		mcast->mc = NULL;
449 	else
450 		mcast->mc = multicast;
451 	clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
452 	spin_unlock_irq(&priv->lock);
453 	complete(&mcast->done);
454 
455 	return status;
456 }
457 
458 /*
459  * Caller must hold 'priv->lock'
460  */
ipoib_mcast_join(struct net_device * dev,struct ipoib_mcast * mcast)461 static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
462 {
463 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
464 	struct ib_sa_multicast *multicast;
465 	struct ib_sa_mcmember_rec rec = {
466 		.join_state = 1
467 	};
468 	ib_sa_comp_mask comp_mask;
469 	int ret = 0;
470 
471 	if (!priv->broadcast ||
472 	    !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
473 		return -EINVAL;
474 
475 	init_completion(&mcast->done);
476 	set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
477 
478 	ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
479 
480 	rec.mgid     = mcast->mcmember.mgid;
481 	rec.port_gid = priv->local_gid;
482 	rec.pkey     = cpu_to_be16(priv->pkey);
483 
484 	comp_mask =
485 		IB_SA_MCMEMBER_REC_MGID		|
486 		IB_SA_MCMEMBER_REC_PORT_GID	|
487 		IB_SA_MCMEMBER_REC_PKEY		|
488 		IB_SA_MCMEMBER_REC_JOIN_STATE;
489 
490 	if (mcast != priv->broadcast) {
491 		/*
492 		 * RFC 4391:
493 		 *  The MGID MUST use the same P_Key, Q_Key, SL, MTU,
494 		 *  and HopLimit as those used in the broadcast-GID.  The rest
495 		 *  of attributes SHOULD follow the values used in the
496 		 *  broadcast-GID as well.
497 		 */
498 		comp_mask |=
499 			IB_SA_MCMEMBER_REC_QKEY			|
500 			IB_SA_MCMEMBER_REC_MTU_SELECTOR		|
501 			IB_SA_MCMEMBER_REC_MTU			|
502 			IB_SA_MCMEMBER_REC_TRAFFIC_CLASS	|
503 			IB_SA_MCMEMBER_REC_RATE_SELECTOR	|
504 			IB_SA_MCMEMBER_REC_RATE			|
505 			IB_SA_MCMEMBER_REC_SL			|
506 			IB_SA_MCMEMBER_REC_FLOW_LABEL		|
507 			IB_SA_MCMEMBER_REC_HOP_LIMIT;
508 
509 		rec.qkey	  = priv->broadcast->mcmember.qkey;
510 		rec.mtu_selector  = IB_SA_EQ;
511 		rec.mtu		  = priv->broadcast->mcmember.mtu;
512 		rec.traffic_class = priv->broadcast->mcmember.traffic_class;
513 		rec.rate_selector = IB_SA_EQ;
514 		rec.rate	  = priv->broadcast->mcmember.rate;
515 		rec.sl		  = priv->broadcast->mcmember.sl;
516 		rec.flow_label	  = priv->broadcast->mcmember.flow_label;
517 		rec.hop_limit	  = priv->broadcast->mcmember.hop_limit;
518 
519 		/*
520 		 * Send-only IB Multicast joins work at the core IB layer but
521 		 * require specific SM support.
522 		 * We can use such joins here only if the current SM supports that feature.
523 		 * However, if not, we emulate an Ethernet multicast send,
524 		 * which does not require a multicast subscription and will
525 		 * still send properly. The most appropriate thing to
526 		 * do is to create the group if it doesn't exist as that
527 		 * most closely emulates the behavior, from a user space
528 		 * application perspective, of Ethernet multicast operation.
529 		 */
530 		if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
531 			rec.join_state = SENDONLY_FULLMEMBER_JOIN;
532 	}
533 
534 	multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
535 					 &rec, comp_mask, GFP_ATOMIC,
536 					 ipoib_mcast_join_complete, mcast);
537 	if (IS_ERR(multicast)) {
538 		ret = PTR_ERR(multicast);
539 		ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
540 		/* Requeue this join task with a backoff delay */
541 		__ipoib_mcast_schedule_join_thread(priv, mcast, 1);
542 		clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
543 		complete(&mcast->done);
544 		return ret;
545 	}
546 	return 0;
547 }
548 
ipoib_mcast_join_task(struct work_struct * work)549 void ipoib_mcast_join_task(struct work_struct *work)
550 {
551 	struct ipoib_dev_priv *priv =
552 		container_of(work, struct ipoib_dev_priv, mcast_task.work);
553 	struct net_device *dev = priv->dev;
554 	struct ib_port_attr port_attr;
555 	unsigned long delay_until = 0;
556 	struct ipoib_mcast *mcast = NULL;
557 
558 	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
559 		return;
560 
561 	if (ib_query_port(priv->ca, priv->port, &port_attr)) {
562 		ipoib_dbg(priv, "ib_query_port() failed\n");
563 		return;
564 	}
565 	if (port_attr.state != IB_PORT_ACTIVE) {
566 		ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
567 			  port_attr.state);
568 		return;
569 	}
570 	priv->local_lid = port_attr.lid;
571 	netif_addr_lock_bh(dev);
572 
573 	if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
574 		netif_addr_unlock_bh(dev);
575 		return;
576 	}
577 	netif_addr_unlock_bh(dev);
578 
579 	spin_lock_irq(&priv->lock);
580 	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
581 		goto out;
582 
583 	if (!priv->broadcast) {
584 		struct ipoib_mcast *broadcast;
585 
586 		broadcast = ipoib_mcast_alloc(dev);
587 		if (!broadcast) {
588 			ipoib_warn(priv, "failed to allocate broadcast group\n");
589 			/*
590 			 * Restart us after a 1 second delay to retry
591 			 * creating our broadcast group and attaching to
592 			 * it.  Until this succeeds, this ipoib dev is
593 			 * completely stalled (multicast wise).
594 			 */
595 			__ipoib_mcast_schedule_join_thread(priv, NULL, 1);
596 			goto out;
597 		}
598 
599 		memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
600 		       sizeof (union ib_gid));
601 		priv->broadcast = broadcast;
602 
603 		__ipoib_mcast_add(dev, priv->broadcast);
604 	}
605 
606 	if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
607 		if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
608 		    !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
609 			mcast = priv->broadcast;
610 			if (mcast->backoff > 1 &&
611 			    time_before(jiffies, mcast->delay_until)) {
612 				delay_until = mcast->delay_until;
613 				mcast = NULL;
614 			}
615 		}
616 		goto out;
617 	}
618 
619 	/*
620 	 * We'll never get here until the broadcast group is both allocated
621 	 * and attached
622 	 */
623 	list_for_each_entry(mcast, &priv->multicast_list, list) {
624 		if (IS_ERR_OR_NULL(mcast->mc) &&
625 		    !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
626 		    (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
627 		     !skb_queue_empty(&mcast->pkt_queue))) {
628 			if (mcast->backoff == 1 ||
629 			    time_after_eq(jiffies, mcast->delay_until)) {
630 				/* Found the next unjoined group */
631 				if (ipoib_mcast_join(dev, mcast)) {
632 					spin_unlock_irq(&priv->lock);
633 					return;
634 				}
635 			} else if (!delay_until ||
636 				 time_before(mcast->delay_until, delay_until))
637 				delay_until = mcast->delay_until;
638 		}
639 	}
640 
641 	mcast = NULL;
642 	ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
643 
644 out:
645 	if (delay_until) {
646 		cancel_delayed_work(&priv->mcast_task);
647 		queue_delayed_work(priv->wq, &priv->mcast_task,
648 				   delay_until - jiffies);
649 	}
650 	if (mcast)
651 		ipoib_mcast_join(dev, mcast);
652 
653 	spin_unlock_irq(&priv->lock);
654 }
655 
ipoib_mcast_start_thread(struct net_device * dev)656 void ipoib_mcast_start_thread(struct net_device *dev)
657 {
658 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
659 	unsigned long flags;
660 
661 	ipoib_dbg_mcast(priv, "starting multicast thread\n");
662 
663 	spin_lock_irqsave(&priv->lock, flags);
664 	__ipoib_mcast_schedule_join_thread(priv, NULL, 0);
665 	spin_unlock_irqrestore(&priv->lock, flags);
666 }
667 
ipoib_mcast_stop_thread(struct net_device * dev)668 void ipoib_mcast_stop_thread(struct net_device *dev)
669 {
670 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
671 
672 	ipoib_dbg_mcast(priv, "stopping multicast thread\n");
673 
674 	cancel_delayed_work_sync(&priv->mcast_task);
675 }
676 
ipoib_mcast_leave(struct net_device * dev,struct ipoib_mcast * mcast)677 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
678 {
679 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
680 	struct rdma_netdev *rn = netdev_priv(dev);
681 	int ret = 0;
682 
683 	if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
684 		ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
685 
686 	if (!IS_ERR_OR_NULL(mcast->mc))
687 		ib_sa_free_multicast(mcast->mc);
688 
689 	if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
690 		ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
691 				mcast->mcmember.mgid.raw);
692 
693 		/* Remove ourselves from the multicast group */
694 		ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
695 				       be16_to_cpu(mcast->mcmember.mlid));
696 		if (ret)
697 			ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
698 	} else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
699 		ipoib_dbg(priv, "leaving with no mcmember but not a "
700 			  "SENDONLY join\n");
701 
702 	return 0;
703 }
704 
705 /*
706  * Check if the multicast group is sendonly. If so remove it from the maps
707  * and add to the remove list
708  */
ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv * priv,u8 * mgid,struct list_head * remove_list)709 void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
710 				struct list_head *remove_list)
711 {
712 	/* Is this multicast ? */
713 	if (*mgid == 0xff) {
714 		struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid);
715 
716 		if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
717 			list_del(&mcast->list);
718 			rb_erase(&mcast->rb_node, &priv->multicast_tree);
719 			list_add_tail(&mcast->list, remove_list);
720 		}
721 	}
722 }
723 
ipoib_mcast_remove_list(struct list_head * remove_list)724 void ipoib_mcast_remove_list(struct list_head *remove_list)
725 {
726 	struct ipoib_mcast *mcast, *tmcast;
727 
728 	/*
729 	 * make sure the in-flight joins have finished before we attempt
730 	 * to leave
731 	 */
732 	list_for_each_entry_safe(mcast, tmcast, remove_list, list)
733 		if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
734 			wait_for_completion(&mcast->done);
735 
736 	list_for_each_entry_safe(mcast, tmcast, remove_list, list) {
737 		ipoib_mcast_leave(mcast->dev, mcast);
738 		ipoib_mcast_free(mcast);
739 	}
740 }
741 
ipoib_mcast_send(struct net_device * dev,u8 * daddr,struct sk_buff * skb)742 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
743 {
744 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
745 	struct rdma_netdev *rn = netdev_priv(dev);
746 	struct ipoib_mcast *mcast;
747 	unsigned long flags;
748 	void *mgid = daddr + 4;
749 
750 	spin_lock_irqsave(&priv->lock, flags);
751 
752 	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)		||
753 	    !priv->broadcast					||
754 	    !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
755 		++dev->stats.tx_dropped;
756 		dev_kfree_skb_any(skb);
757 		goto unlock;
758 	}
759 
760 	mcast = __ipoib_mcast_find(dev, mgid);
761 	if (!mcast || !mcast->ah) {
762 		if (!mcast) {
763 			/* Let's create a new send only group now */
764 			ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
765 					mgid);
766 
767 			mcast = ipoib_mcast_alloc(dev);
768 			if (!mcast) {
769 				ipoib_warn(priv, "unable to allocate memory "
770 					   "for multicast structure\n");
771 				++dev->stats.tx_dropped;
772 				dev_kfree_skb_any(skb);
773 				goto unlock;
774 			}
775 
776 			set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
777 			memcpy(mcast->mcmember.mgid.raw, mgid,
778 			       sizeof (union ib_gid));
779 			__ipoib_mcast_add(dev, mcast);
780 			list_add_tail(&mcast->list, &priv->multicast_list);
781 		}
782 		if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) {
783 			/* put pseudoheader back on for next time */
784 			skb_push(skb, sizeof(struct ipoib_pseudo_header));
785 			skb_queue_tail(&mcast->pkt_queue, skb);
786 		} else {
787 			++dev->stats.tx_dropped;
788 			dev_kfree_skb_any(skb);
789 		}
790 		if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
791 			__ipoib_mcast_schedule_join_thread(priv, NULL, 0);
792 		}
793 	} else {
794 		struct ipoib_neigh *neigh;
795 
796 		spin_unlock_irqrestore(&priv->lock, flags);
797 		neigh = ipoib_neigh_get(dev, daddr);
798 		spin_lock_irqsave(&priv->lock, flags);
799 		if (!neigh) {
800 			neigh = ipoib_neigh_alloc(daddr, dev);
801 			/* Make sure that the neigh will be added only
802 			 * once to mcast list.
803 			 */
804 			if (neigh && list_empty(&neigh->list)) {
805 				kref_get(&mcast->ah->ref);
806 				neigh->ah	= mcast->ah;
807 				neigh->ah->valid = 1;
808 				list_add_tail(&neigh->list, &mcast->neigh_list);
809 			}
810 		}
811 		spin_unlock_irqrestore(&priv->lock, flags);
812 		mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah,
813 						IB_MULTICAST_QPN);
814 		if (neigh)
815 			ipoib_neigh_put(neigh);
816 		return;
817 	}
818 
819 unlock:
820 	spin_unlock_irqrestore(&priv->lock, flags);
821 }
822 
ipoib_mcast_dev_flush(struct net_device * dev)823 void ipoib_mcast_dev_flush(struct net_device *dev)
824 {
825 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
826 	LIST_HEAD(remove_list);
827 	struct ipoib_mcast *mcast, *tmcast;
828 	unsigned long flags;
829 
830 	mutex_lock(&priv->mcast_mutex);
831 	ipoib_dbg_mcast(priv, "flushing multicast list\n");
832 
833 	spin_lock_irqsave(&priv->lock, flags);
834 
835 	list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
836 		list_del(&mcast->list);
837 		rb_erase(&mcast->rb_node, &priv->multicast_tree);
838 		list_add_tail(&mcast->list, &remove_list);
839 	}
840 
841 	if (priv->broadcast) {
842 		rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
843 		list_add_tail(&priv->broadcast->list, &remove_list);
844 		priv->broadcast = NULL;
845 	}
846 
847 	spin_unlock_irqrestore(&priv->lock, flags);
848 
849 	ipoib_mcast_remove_list(&remove_list);
850 	mutex_unlock(&priv->mcast_mutex);
851 }
852 
ipoib_mcast_addr_is_valid(const u8 * addr,const u8 * broadcast)853 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
854 {
855 	/* reserved QPN, prefix, scope */
856 	if (memcmp(addr, broadcast, 6))
857 		return 0;
858 	/* signature lower, pkey */
859 	if (memcmp(addr + 7, broadcast + 7, 3))
860 		return 0;
861 	return 1;
862 }
863 
ipoib_mcast_restart_task(struct work_struct * work)864 void ipoib_mcast_restart_task(struct work_struct *work)
865 {
866 	struct ipoib_dev_priv *priv =
867 		container_of(work, struct ipoib_dev_priv, restart_task);
868 	struct net_device *dev = priv->dev;
869 	struct netdev_hw_addr *ha;
870 	struct ipoib_mcast *mcast, *tmcast;
871 	LIST_HEAD(remove_list);
872 	struct ib_sa_mcmember_rec rec;
873 
874 	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
875 		/*
876 		 * shortcut...on shutdown flush is called next, just
877 		 * let it do all the work
878 		 */
879 		return;
880 
881 	ipoib_dbg_mcast(priv, "restarting multicast task\n");
882 
883 	netif_addr_lock_bh(dev);
884 	spin_lock_irq(&priv->lock);
885 
886 	/*
887 	 * Unfortunately, the networking core only gives us a list of all of
888 	 * the multicast hardware addresses. We need to figure out which ones
889 	 * are new and which ones have been removed
890 	 */
891 
892 	/* Clear out the found flag */
893 	list_for_each_entry(mcast, &priv->multicast_list, list)
894 		clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
895 
896 	/* Mark all of the entries that are found or don't exist */
897 	netdev_for_each_mc_addr(ha, dev) {
898 		union ib_gid mgid;
899 
900 		if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
901 			continue;
902 
903 		memcpy(mgid.raw, ha->addr + 4, sizeof(mgid));
904 
905 		mcast = __ipoib_mcast_find(dev, &mgid);
906 		if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
907 			struct ipoib_mcast *nmcast;
908 
909 			/* ignore group which is directly joined by userspace */
910 			if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
911 			    !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
912 				ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
913 						mgid.raw);
914 				continue;
915 			}
916 
917 			/* Not found or send-only group, let's add a new entry */
918 			ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
919 					mgid.raw);
920 
921 			nmcast = ipoib_mcast_alloc(dev);
922 			if (!nmcast) {
923 				ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
924 				continue;
925 			}
926 
927 			set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
928 
929 			nmcast->mcmember.mgid = mgid;
930 
931 			if (mcast) {
932 				/* Destroy the send only entry */
933 				list_move_tail(&mcast->list, &remove_list);
934 
935 				rb_replace_node(&mcast->rb_node,
936 						&nmcast->rb_node,
937 						&priv->multicast_tree);
938 			} else
939 				__ipoib_mcast_add(dev, nmcast);
940 
941 			list_add_tail(&nmcast->list, &priv->multicast_list);
942 		}
943 
944 		if (mcast)
945 			set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
946 	}
947 
948 	/* Remove all of the entries don't exist anymore */
949 	list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
950 		if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
951 		    !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
952 			ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
953 					mcast->mcmember.mgid.raw);
954 
955 			rb_erase(&mcast->rb_node, &priv->multicast_tree);
956 
957 			/* Move to the remove list */
958 			list_move_tail(&mcast->list, &remove_list);
959 		}
960 	}
961 
962 	spin_unlock_irq(&priv->lock);
963 	netif_addr_unlock_bh(dev);
964 
965 	ipoib_mcast_remove_list(&remove_list);
966 
967 	/*
968 	 * Double check that we are still up
969 	 */
970 	if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
971 		spin_lock_irq(&priv->lock);
972 		__ipoib_mcast_schedule_join_thread(priv, NULL, 0);
973 		spin_unlock_irq(&priv->lock);
974 	}
975 }
976 
977 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
978 
ipoib_mcast_iter_init(struct net_device * dev)979 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
980 {
981 	struct ipoib_mcast_iter *iter;
982 
983 	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
984 	if (!iter)
985 		return NULL;
986 
987 	iter->dev = dev;
988 	memset(iter->mgid.raw, 0, 16);
989 
990 	if (ipoib_mcast_iter_next(iter)) {
991 		kfree(iter);
992 		return NULL;
993 	}
994 
995 	return iter;
996 }
997 
ipoib_mcast_iter_next(struct ipoib_mcast_iter * iter)998 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
999 {
1000 	struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
1001 	struct rb_node *n;
1002 	struct ipoib_mcast *mcast;
1003 	int ret = 1;
1004 
1005 	spin_lock_irq(&priv->lock);
1006 
1007 	n = rb_first(&priv->multicast_tree);
1008 
1009 	while (n) {
1010 		mcast = rb_entry(n, struct ipoib_mcast, rb_node);
1011 
1012 		if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
1013 			   sizeof (union ib_gid)) < 0) {
1014 			iter->mgid      = mcast->mcmember.mgid;
1015 			iter->created   = mcast->created;
1016 			iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
1017 			iter->complete  = !!mcast->ah;
1018 			iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1019 
1020 			ret = 0;
1021 
1022 			break;
1023 		}
1024 
1025 		n = rb_next(n);
1026 	}
1027 
1028 	spin_unlock_irq(&priv->lock);
1029 
1030 	return ret;
1031 }
1032 
ipoib_mcast_iter_read(struct ipoib_mcast_iter * iter,union ib_gid * mgid,unsigned long * created,unsigned int * queuelen,unsigned int * complete,unsigned int * send_only)1033 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1034 			   union ib_gid *mgid,
1035 			   unsigned long *created,
1036 			   unsigned int *queuelen,
1037 			   unsigned int *complete,
1038 			   unsigned int *send_only)
1039 {
1040 	*mgid      = iter->mgid;
1041 	*created   = iter->created;
1042 	*queuelen  = iter->queuelen;
1043 	*complete  = iter->complete;
1044 	*send_only = iter->send_only;
1045 }
1046 
1047 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
1048