1 /*
2  * Copyright (c) 2004 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 "ipoib.h"
36 
37 #include <linux/module.h>
38 
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.h>
42 #include <linux/vmalloc.h>
43 
44 #include <linux/if_arp.h>	/* For ARPHRD_xxx */
45 
46 #include <linux/ip.h>
47 #include <linux/in.h>
48 
49 #include <linux/jhash.h>
50 #include <net/arp.h>
51 #include <net/addrconf.h>
52 #include <linux/inetdevice.h>
53 #include <rdma/ib_cache.h>
54 
55 MODULE_AUTHOR("Roland Dreier");
56 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
57 MODULE_LICENSE("Dual BSD/GPL");
58 
59 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
60 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
61 
62 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
63 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
64 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
65 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
66 
67 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
68 int ipoib_debug_level;
69 
70 module_param_named(debug_level, ipoib_debug_level, int, 0644);
71 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
72 #endif
73 
74 struct ipoib_path_iter {
75 	struct net_device *dev;
76 	struct ipoib_path  path;
77 };
78 
79 static const u8 ipv4_bcast_addr[] = {
80 	0x00, 0xff, 0xff, 0xff,
81 	0xff, 0x12, 0x40, 0x1b,	0x00, 0x00, 0x00, 0x00,
82 	0x00, 0x00, 0x00, 0x00,	0xff, 0xff, 0xff, 0xff
83 };
84 
85 struct workqueue_struct *ipoib_workqueue;
86 
87 struct ib_sa_client ipoib_sa_client;
88 
89 static int ipoib_add_one(struct ib_device *device);
90 static void ipoib_remove_one(struct ib_device *device, void *client_data);
91 static void ipoib_neigh_reclaim(struct rcu_head *rp);
92 static struct net_device *ipoib_get_net_dev_by_params(
93 		struct ib_device *dev, u32 port, u16 pkey,
94 		const union ib_gid *gid, const struct sockaddr *addr,
95 		void *client_data);
96 static int ipoib_set_mac(struct net_device *dev, void *addr);
97 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
98 		       int cmd);
99 
100 static struct ib_client ipoib_client = {
101 	.name   = "ipoib",
102 	.add    = ipoib_add_one,
103 	.remove = ipoib_remove_one,
104 	.get_net_dev_by_params = ipoib_get_net_dev_by_params,
105 };
106 
107 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
108 static int ipoib_netdev_event(struct notifier_block *this,
109 			      unsigned long event, void *ptr)
110 {
111 	struct netdev_notifier_info *ni = ptr;
112 	struct net_device *dev = ni->dev;
113 
114 	if (dev->netdev_ops->ndo_open != ipoib_open)
115 		return NOTIFY_DONE;
116 
117 	switch (event) {
118 	case NETDEV_REGISTER:
119 		ipoib_create_debug_files(dev);
120 		break;
121 	case NETDEV_CHANGENAME:
122 		ipoib_delete_debug_files(dev);
123 		ipoib_create_debug_files(dev);
124 		break;
125 	case NETDEV_UNREGISTER:
126 		ipoib_delete_debug_files(dev);
127 		break;
128 	}
129 
130 	return NOTIFY_DONE;
131 }
132 #endif
133 
134 int ipoib_open(struct net_device *dev)
135 {
136 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
137 
138 	ipoib_dbg(priv, "bringing up interface\n");
139 
140 	netif_carrier_off(dev);
141 
142 	set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
143 
144 	if (ipoib_ib_dev_open(dev)) {
145 		if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
146 			return 0;
147 		goto err_disable;
148 	}
149 
150 	ipoib_ib_dev_up(dev);
151 
152 	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
153 		struct ipoib_dev_priv *cpriv;
154 
155 		/* Bring up any child interfaces too */
156 		down_read(&priv->vlan_rwsem);
157 		list_for_each_entry(cpriv, &priv->child_intfs, list) {
158 			int flags;
159 
160 			flags = cpriv->dev->flags;
161 			if (flags & IFF_UP)
162 				continue;
163 
164 			dev_change_flags(cpriv->dev, flags | IFF_UP, NULL);
165 		}
166 		up_read(&priv->vlan_rwsem);
167 	} else if (priv->parent) {
168 		struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
169 
170 		if (!test_bit(IPOIB_FLAG_ADMIN_UP, &ppriv->flags))
171 			ipoib_dbg(priv, "parent device %s is not up, so child device may be not functioning.\n",
172 				  ppriv->dev->name);
173 	}
174 	netif_start_queue(dev);
175 
176 	return 0;
177 
178 err_disable:
179 	clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
180 
181 	return -EINVAL;
182 }
183 
184 static int ipoib_stop(struct net_device *dev)
185 {
186 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
187 
188 	ipoib_dbg(priv, "stopping interface\n");
189 
190 	clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
191 
192 	netif_stop_queue(dev);
193 
194 	ipoib_ib_dev_down(dev);
195 	ipoib_ib_dev_stop(dev);
196 
197 	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
198 		struct ipoib_dev_priv *cpriv;
199 
200 		/* Bring down any child interfaces too */
201 		down_read(&priv->vlan_rwsem);
202 		list_for_each_entry(cpriv, &priv->child_intfs, list) {
203 			int flags;
204 
205 			flags = cpriv->dev->flags;
206 			if (!(flags & IFF_UP))
207 				continue;
208 
209 			dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL);
210 		}
211 		up_read(&priv->vlan_rwsem);
212 	}
213 
214 	return 0;
215 }
216 
217 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
218 {
219 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
220 
221 	if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
222 		features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
223 
224 	return features;
225 }
226 
227 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
228 {
229 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
230 	int ret = 0;
231 
232 	/* dev->mtu > 2K ==> connected mode */
233 	if (ipoib_cm_admin_enabled(dev)) {
234 		if (new_mtu > ipoib_cm_max_mtu(dev))
235 			return -EINVAL;
236 
237 		if (new_mtu > priv->mcast_mtu)
238 			ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
239 				   priv->mcast_mtu);
240 
241 		dev->mtu = new_mtu;
242 		return 0;
243 	}
244 
245 	if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
246 	    new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
247 		return -EINVAL;
248 
249 	priv->admin_mtu = new_mtu;
250 
251 	if (priv->mcast_mtu < priv->admin_mtu)
252 		ipoib_dbg(priv, "MTU must be smaller than the underlying "
253 				"link layer MTU - 4 (%u)\n", priv->mcast_mtu);
254 
255 	new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
256 
257 	if (priv->rn_ops->ndo_change_mtu) {
258 		bool carrier_status = netif_carrier_ok(dev);
259 
260 		netif_carrier_off(dev);
261 
262 		/* notify lower level on the real mtu */
263 		ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
264 
265 		if (carrier_status)
266 			netif_carrier_on(dev);
267 	} else {
268 		dev->mtu = new_mtu;
269 	}
270 
271 	return ret;
272 }
273 
274 static void ipoib_get_stats(struct net_device *dev,
275 			    struct rtnl_link_stats64 *stats)
276 {
277 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
278 
279 	if (priv->rn_ops->ndo_get_stats64)
280 		priv->rn_ops->ndo_get_stats64(dev, stats);
281 	else
282 		netdev_stats_to_stats64(stats, &dev->stats);
283 }
284 
285 /* Called with an RCU read lock taken */
286 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
287 					struct net_device *dev)
288 {
289 	struct net *net = dev_net(dev);
290 	struct in_device *in_dev;
291 	struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
292 	struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
293 	__be32 ret_addr;
294 
295 	switch (addr->sa_family) {
296 	case AF_INET:
297 		in_dev = in_dev_get(dev);
298 		if (!in_dev)
299 			return false;
300 
301 		ret_addr = inet_confirm_addr(net, in_dev, 0,
302 					     addr_in->sin_addr.s_addr,
303 					     RT_SCOPE_HOST);
304 		in_dev_put(in_dev);
305 		if (ret_addr)
306 			return true;
307 
308 		break;
309 	case AF_INET6:
310 		if (IS_ENABLED(CONFIG_IPV6) &&
311 		    ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
312 			return true;
313 
314 		break;
315 	}
316 	return false;
317 }
318 
319 /*
320  * Find the master net_device on top of the given net_device.
321  * @dev: base IPoIB net_device
322  *
323  * Returns the master net_device with a reference held, or the same net_device
324  * if no master exists.
325  */
326 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
327 {
328 	struct net_device *master;
329 
330 	rcu_read_lock();
331 	master = netdev_master_upper_dev_get_rcu(dev);
332 	if (master)
333 		dev_hold(master);
334 	rcu_read_unlock();
335 
336 	if (master)
337 		return master;
338 
339 	dev_hold(dev);
340 	return dev;
341 }
342 
343 struct ipoib_walk_data {
344 	const struct sockaddr *addr;
345 	struct net_device *result;
346 };
347 
348 static int ipoib_upper_walk(struct net_device *upper,
349 			    struct netdev_nested_priv *priv)
350 {
351 	struct ipoib_walk_data *data = (struct ipoib_walk_data *)priv->data;
352 	int ret = 0;
353 
354 	if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
355 		dev_hold(upper);
356 		data->result = upper;
357 		ret = 1;
358 	}
359 
360 	return ret;
361 }
362 
363 /**
364  * ipoib_get_net_dev_match_addr - Find a net_device matching
365  * the given address, which is an upper device of the given net_device.
366  *
367  * @addr: IP address to look for.
368  * @dev: base IPoIB net_device
369  *
370  * If found, returns the net_device with a reference held. Otherwise return
371  * NULL.
372  */
373 static struct net_device *ipoib_get_net_dev_match_addr(
374 		const struct sockaddr *addr, struct net_device *dev)
375 {
376 	struct netdev_nested_priv priv;
377 	struct ipoib_walk_data data = {
378 		.addr = addr,
379 	};
380 
381 	priv.data = (void *)&data;
382 	rcu_read_lock();
383 	if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
384 		dev_hold(dev);
385 		data.result = dev;
386 		goto out;
387 	}
388 
389 	netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &priv);
390 out:
391 	rcu_read_unlock();
392 	return data.result;
393 }
394 
395 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
396  * pkey_index and address, if one exists.
397  *
398  * @found_net_dev: contains a matching net_device if the return value >= 1,
399  * with a reference held. */
400 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
401 				     const union ib_gid *gid,
402 				     u16 pkey_index,
403 				     const struct sockaddr *addr,
404 				     int nesting,
405 				     struct net_device **found_net_dev)
406 {
407 	struct ipoib_dev_priv *child_priv;
408 	struct net_device *net_dev = NULL;
409 	int matches = 0;
410 
411 	if (priv->pkey_index == pkey_index &&
412 	    (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
413 		if (!addr) {
414 			net_dev = ipoib_get_master_net_dev(priv->dev);
415 		} else {
416 			/* Verify the net_device matches the IP address, as
417 			 * IPoIB child devices currently share a GID. */
418 			net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
419 		}
420 		if (net_dev) {
421 			if (!*found_net_dev)
422 				*found_net_dev = net_dev;
423 			else
424 				dev_put(net_dev);
425 			++matches;
426 		}
427 	}
428 
429 	/* Check child interfaces */
430 	down_read_nested(&priv->vlan_rwsem, nesting);
431 	list_for_each_entry(child_priv, &priv->child_intfs, list) {
432 		matches += ipoib_match_gid_pkey_addr(child_priv, gid,
433 						    pkey_index, addr,
434 						    nesting + 1,
435 						    found_net_dev);
436 		if (matches > 1)
437 			break;
438 	}
439 	up_read(&priv->vlan_rwsem);
440 
441 	return matches;
442 }
443 
444 /* Returns the number of matching net_devs found (between 0 and 2). Also
445  * return the matching net_device in the @net_dev parameter, holding a
446  * reference to the net_device, if the number of matches >= 1 */
447 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u32 port,
448 					 u16 pkey_index,
449 					 const union ib_gid *gid,
450 					 const struct sockaddr *addr,
451 					 struct net_device **net_dev)
452 {
453 	struct ipoib_dev_priv *priv;
454 	int matches = 0;
455 
456 	*net_dev = NULL;
457 
458 	list_for_each_entry(priv, dev_list, list) {
459 		if (priv->port != port)
460 			continue;
461 
462 		matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
463 						     addr, 0, net_dev);
464 		if (matches > 1)
465 			break;
466 	}
467 
468 	return matches;
469 }
470 
471 static struct net_device *ipoib_get_net_dev_by_params(
472 		struct ib_device *dev, u32 port, u16 pkey,
473 		const union ib_gid *gid, const struct sockaddr *addr,
474 		void *client_data)
475 {
476 	struct net_device *net_dev;
477 	struct list_head *dev_list = client_data;
478 	u16 pkey_index;
479 	int matches;
480 	int ret;
481 
482 	if (!rdma_protocol_ib(dev, port))
483 		return NULL;
484 
485 	ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
486 	if (ret)
487 		return NULL;
488 
489 	/* See if we can find a unique device matching the L2 parameters */
490 	matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
491 						gid, NULL, &net_dev);
492 
493 	switch (matches) {
494 	case 0:
495 		return NULL;
496 	case 1:
497 		return net_dev;
498 	}
499 
500 	dev_put(net_dev);
501 
502 	/* Couldn't find a unique device with L2 parameters only. Use L3
503 	 * address to uniquely match the net device */
504 	matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
505 						gid, addr, &net_dev);
506 	switch (matches) {
507 	case 0:
508 		return NULL;
509 	default:
510 		dev_warn_ratelimited(&dev->dev,
511 				     "duplicate IP address detected\n");
512 		fallthrough;
513 	case 1:
514 		return net_dev;
515 	}
516 }
517 
518 int ipoib_set_mode(struct net_device *dev, const char *buf)
519 {
520 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
521 
522 	if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
523 	     !strcmp(buf, "connected\n")) ||
524 	     (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
525 	     !strcmp(buf, "datagram\n"))) {
526 		return 0;
527 	}
528 
529 	/* flush paths if we switch modes so that connections are restarted */
530 	if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
531 		set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
532 		ipoib_warn(priv, "enabling connected mode "
533 			   "will cause multicast packet drops\n");
534 		netdev_update_features(dev);
535 		dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
536 		netif_set_real_num_tx_queues(dev, 1);
537 		rtnl_unlock();
538 		priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
539 
540 		ipoib_flush_paths(dev);
541 		return (!rtnl_trylock()) ? -EBUSY : 0;
542 	}
543 
544 	if (!strcmp(buf, "datagram\n")) {
545 		clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
546 		netdev_update_features(dev);
547 		dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
548 		netif_set_real_num_tx_queues(dev, dev->num_tx_queues);
549 		rtnl_unlock();
550 		ipoib_flush_paths(dev);
551 		return (!rtnl_trylock()) ? -EBUSY : 0;
552 	}
553 
554 	return -EINVAL;
555 }
556 
557 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
558 {
559 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
560 	struct rb_node *n = priv->path_tree.rb_node;
561 	struct ipoib_path *path;
562 	int ret;
563 
564 	while (n) {
565 		path = rb_entry(n, struct ipoib_path, rb_node);
566 
567 		ret = memcmp(gid, path->pathrec.dgid.raw,
568 			     sizeof (union ib_gid));
569 
570 		if (ret < 0)
571 			n = n->rb_left;
572 		else if (ret > 0)
573 			n = n->rb_right;
574 		else
575 			return path;
576 	}
577 
578 	return NULL;
579 }
580 
581 static int __path_add(struct net_device *dev, struct ipoib_path *path)
582 {
583 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
584 	struct rb_node **n = &priv->path_tree.rb_node;
585 	struct rb_node *pn = NULL;
586 	struct ipoib_path *tpath;
587 	int ret;
588 
589 	while (*n) {
590 		pn = *n;
591 		tpath = rb_entry(pn, struct ipoib_path, rb_node);
592 
593 		ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
594 			     sizeof (union ib_gid));
595 		if (ret < 0)
596 			n = &pn->rb_left;
597 		else if (ret > 0)
598 			n = &pn->rb_right;
599 		else
600 			return -EEXIST;
601 	}
602 
603 	rb_link_node(&path->rb_node, pn, n);
604 	rb_insert_color(&path->rb_node, &priv->path_tree);
605 
606 	list_add_tail(&path->list, &priv->path_list);
607 
608 	return 0;
609 }
610 
611 static void path_free(struct net_device *dev, struct ipoib_path *path)
612 {
613 	struct sk_buff *skb;
614 
615 	while ((skb = __skb_dequeue(&path->queue)))
616 		dev_kfree_skb_irq(skb);
617 
618 	ipoib_dbg(ipoib_priv(dev), "%s\n", __func__);
619 
620 	/* remove all neigh connected to this path */
621 	ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
622 
623 	if (path->ah)
624 		ipoib_put_ah(path->ah);
625 
626 	kfree(path);
627 }
628 
629 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
630 
631 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
632 {
633 	struct ipoib_path_iter *iter;
634 
635 	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
636 	if (!iter)
637 		return NULL;
638 
639 	iter->dev = dev;
640 	memset(iter->path.pathrec.dgid.raw, 0, 16);
641 
642 	if (ipoib_path_iter_next(iter)) {
643 		kfree(iter);
644 		return NULL;
645 	}
646 
647 	return iter;
648 }
649 
650 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
651 {
652 	struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
653 	struct rb_node *n;
654 	struct ipoib_path *path;
655 	int ret = 1;
656 
657 	spin_lock_irq(&priv->lock);
658 
659 	n = rb_first(&priv->path_tree);
660 
661 	while (n) {
662 		path = rb_entry(n, struct ipoib_path, rb_node);
663 
664 		if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
665 			   sizeof (union ib_gid)) < 0) {
666 			iter->path = *path;
667 			ret = 0;
668 			break;
669 		}
670 
671 		n = rb_next(n);
672 	}
673 
674 	spin_unlock_irq(&priv->lock);
675 
676 	return ret;
677 }
678 
679 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
680 			  struct ipoib_path *path)
681 {
682 	*path = iter->path;
683 }
684 
685 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
686 
687 void ipoib_mark_paths_invalid(struct net_device *dev)
688 {
689 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
690 	struct ipoib_path *path, *tp;
691 
692 	spin_lock_irq(&priv->lock);
693 
694 	list_for_each_entry_safe(path, tp, &priv->path_list, list) {
695 		ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
696 			  be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
697 			  path->pathrec.dgid.raw);
698 		if (path->ah)
699 			path->ah->valid = 0;
700 	}
701 
702 	spin_unlock_irq(&priv->lock);
703 }
704 
705 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
706 {
707 	struct ipoib_pseudo_header *phdr;
708 
709 	phdr = skb_push(skb, sizeof(*phdr));
710 	memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
711 }
712 
713 void ipoib_flush_paths(struct net_device *dev)
714 {
715 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
716 	struct ipoib_path *path, *tp;
717 	LIST_HEAD(remove_list);
718 	unsigned long flags;
719 
720 	netif_tx_lock_bh(dev);
721 	spin_lock_irqsave(&priv->lock, flags);
722 
723 	list_splice_init(&priv->path_list, &remove_list);
724 
725 	list_for_each_entry(path, &remove_list, list)
726 		rb_erase(&path->rb_node, &priv->path_tree);
727 
728 	list_for_each_entry_safe(path, tp, &remove_list, list) {
729 		if (path->query)
730 			ib_sa_cancel_query(path->query_id, path->query);
731 		spin_unlock_irqrestore(&priv->lock, flags);
732 		netif_tx_unlock_bh(dev);
733 		wait_for_completion(&path->done);
734 		path_free(dev, path);
735 		netif_tx_lock_bh(dev);
736 		spin_lock_irqsave(&priv->lock, flags);
737 	}
738 
739 	spin_unlock_irqrestore(&priv->lock, flags);
740 	netif_tx_unlock_bh(dev);
741 }
742 
743 static void path_rec_completion(int status,
744 				struct sa_path_rec *pathrec,
745 				void *path_ptr)
746 {
747 	struct ipoib_path *path = path_ptr;
748 	struct net_device *dev = path->dev;
749 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
750 	struct ipoib_ah *ah = NULL;
751 	struct ipoib_ah *old_ah = NULL;
752 	struct ipoib_neigh *neigh, *tn;
753 	struct sk_buff_head skqueue;
754 	struct sk_buff *skb;
755 	unsigned long flags;
756 
757 	if (!status)
758 		ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
759 			  be32_to_cpu(sa_path_get_dlid(pathrec)),
760 			  pathrec->dgid.raw);
761 	else
762 		ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
763 			  status, path->pathrec.dgid.raw);
764 
765 	skb_queue_head_init(&skqueue);
766 
767 	if (!status) {
768 		struct rdma_ah_attr av;
769 
770 		if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
771 					       pathrec, &av, NULL)) {
772 			ah = ipoib_create_ah(dev, priv->pd, &av);
773 			rdma_destroy_ah_attr(&av);
774 		}
775 	}
776 
777 	spin_lock_irqsave(&priv->lock, flags);
778 
779 	if (!IS_ERR_OR_NULL(ah)) {
780 		/*
781 		 * pathrec.dgid is used as the database key from the LLADDR,
782 		 * it must remain unchanged even if the SA returns a different
783 		 * GID to use in the AH.
784 		 */
785 		if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
786 			   sizeof(union ib_gid))) {
787 			ipoib_dbg(
788 				priv,
789 				"%s got PathRec for gid %pI6 while asked for %pI6\n",
790 				dev->name, pathrec->dgid.raw,
791 				path->pathrec.dgid.raw);
792 			memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
793 			       sizeof(union ib_gid));
794 		}
795 
796 		path->pathrec = *pathrec;
797 
798 		old_ah   = path->ah;
799 		path->ah = ah;
800 
801 		ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
802 			  ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
803 			  pathrec->sl);
804 
805 		while ((skb = __skb_dequeue(&path->queue)))
806 			__skb_queue_tail(&skqueue, skb);
807 
808 		list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
809 			if (neigh->ah) {
810 				WARN_ON(neigh->ah != old_ah);
811 				/*
812 				 * Dropping the ah reference inside
813 				 * priv->lock is safe here, because we
814 				 * will hold one more reference from
815 				 * the original value of path->ah (ie
816 				 * old_ah).
817 				 */
818 				ipoib_put_ah(neigh->ah);
819 			}
820 			kref_get(&path->ah->ref);
821 			neigh->ah = path->ah;
822 
823 			if (ipoib_cm_enabled(dev, neigh->daddr)) {
824 				if (!ipoib_cm_get(neigh))
825 					ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
826 									       path,
827 									       neigh));
828 				if (!ipoib_cm_get(neigh)) {
829 					ipoib_neigh_free(neigh);
830 					continue;
831 				}
832 			}
833 
834 			while ((skb = __skb_dequeue(&neigh->queue)))
835 				__skb_queue_tail(&skqueue, skb);
836 		}
837 		path->ah->valid = 1;
838 	}
839 
840 	path->query = NULL;
841 	complete(&path->done);
842 
843 	spin_unlock_irqrestore(&priv->lock, flags);
844 
845 	if (IS_ERR_OR_NULL(ah))
846 		ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
847 
848 	if (old_ah)
849 		ipoib_put_ah(old_ah);
850 
851 	while ((skb = __skb_dequeue(&skqueue))) {
852 		int ret;
853 		skb->dev = dev;
854 		ret = dev_queue_xmit(skb);
855 		if (ret)
856 			ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
857 				   __func__, ret);
858 	}
859 }
860 
861 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
862 			  void *gid)
863 {
864 	path->dev = priv->dev;
865 
866 	if (rdma_cap_opa_ah(priv->ca, priv->port))
867 		path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
868 	else
869 		path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
870 
871 	memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
872 	path->pathrec.sgid	    = priv->local_gid;
873 	path->pathrec.pkey	    = cpu_to_be16(priv->pkey);
874 	path->pathrec.numb_path     = 1;
875 	path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
876 }
877 
878 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
879 {
880 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
881 	struct ipoib_path *path;
882 
883 	if (!priv->broadcast)
884 		return NULL;
885 
886 	path = kzalloc(sizeof(*path), GFP_ATOMIC);
887 	if (!path)
888 		return NULL;
889 
890 	skb_queue_head_init(&path->queue);
891 
892 	INIT_LIST_HEAD(&path->neigh_list);
893 
894 	init_path_rec(priv, path, gid);
895 
896 	return path;
897 }
898 
899 static int path_rec_start(struct net_device *dev,
900 			  struct ipoib_path *path)
901 {
902 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
903 
904 	ipoib_dbg(priv, "Start path record lookup for %pI6\n",
905 		  path->pathrec.dgid.raw);
906 
907 	init_completion(&path->done);
908 
909 	path->query_id =
910 		ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
911 				   &path->pathrec,
912 				   IB_SA_PATH_REC_DGID		|
913 				   IB_SA_PATH_REC_SGID		|
914 				   IB_SA_PATH_REC_NUMB_PATH	|
915 				   IB_SA_PATH_REC_TRAFFIC_CLASS |
916 				   IB_SA_PATH_REC_PKEY,
917 				   1000, GFP_ATOMIC,
918 				   path_rec_completion,
919 				   path, &path->query);
920 	if (path->query_id < 0) {
921 		ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
922 		path->query = NULL;
923 		complete(&path->done);
924 		return path->query_id;
925 	}
926 
927 	return 0;
928 }
929 
930 static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
931 			       struct net_device *dev)
932 {
933 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
934 	struct ipoib_path *path;
935 	unsigned long flags;
936 
937 	spin_lock_irqsave(&priv->lock, flags);
938 
939 	path = __path_find(dev, daddr + 4);
940 	if (!path)
941 		goto out;
942 	if (!path->query)
943 		path_rec_start(dev, path);
944 out:
945 	spin_unlock_irqrestore(&priv->lock, flags);
946 }
947 
948 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
949 					  struct net_device *dev)
950 {
951 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
952 	struct rdma_netdev *rn = netdev_priv(dev);
953 	struct ipoib_path *path;
954 	struct ipoib_neigh *neigh;
955 	unsigned long flags;
956 
957 	spin_lock_irqsave(&priv->lock, flags);
958 	neigh = ipoib_neigh_alloc(daddr, dev);
959 	if (!neigh) {
960 		spin_unlock_irqrestore(&priv->lock, flags);
961 		++dev->stats.tx_dropped;
962 		dev_kfree_skb_any(skb);
963 		return NULL;
964 	}
965 
966 	/* To avoid race condition, make sure that the
967 	 * neigh will be added only once.
968 	 */
969 	if (unlikely(!list_empty(&neigh->list))) {
970 		spin_unlock_irqrestore(&priv->lock, flags);
971 		return neigh;
972 	}
973 
974 	path = __path_find(dev, daddr + 4);
975 	if (!path) {
976 		path = path_rec_create(dev, daddr + 4);
977 		if (!path)
978 			goto err_path;
979 
980 		__path_add(dev, path);
981 	}
982 
983 	list_add_tail(&neigh->list, &path->neigh_list);
984 
985 	if (path->ah && path->ah->valid) {
986 		kref_get(&path->ah->ref);
987 		neigh->ah = path->ah;
988 
989 		if (ipoib_cm_enabled(dev, neigh->daddr)) {
990 			if (!ipoib_cm_get(neigh))
991 				ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
992 			if (!ipoib_cm_get(neigh)) {
993 				ipoib_neigh_free(neigh);
994 				goto err_drop;
995 			}
996 			if (skb_queue_len(&neigh->queue) <
997 			    IPOIB_MAX_PATH_REC_QUEUE) {
998 				push_pseudo_header(skb, neigh->daddr);
999 				__skb_queue_tail(&neigh->queue, skb);
1000 			} else {
1001 				ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
1002 					   skb_queue_len(&neigh->queue));
1003 				goto err_drop;
1004 			}
1005 		} else {
1006 			spin_unlock_irqrestore(&priv->lock, flags);
1007 			path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1008 						       IPOIB_QPN(daddr));
1009 			ipoib_neigh_put(neigh);
1010 			return NULL;
1011 		}
1012 	} else {
1013 		neigh->ah  = NULL;
1014 
1015 		if (!path->query && path_rec_start(dev, path))
1016 			goto err_path;
1017 		if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1018 			push_pseudo_header(skb, neigh->daddr);
1019 			__skb_queue_tail(&neigh->queue, skb);
1020 		} else {
1021 			goto err_drop;
1022 		}
1023 	}
1024 
1025 	spin_unlock_irqrestore(&priv->lock, flags);
1026 	ipoib_neigh_put(neigh);
1027 	return NULL;
1028 
1029 err_path:
1030 	ipoib_neigh_free(neigh);
1031 err_drop:
1032 	++dev->stats.tx_dropped;
1033 	dev_kfree_skb_any(skb);
1034 
1035 	spin_unlock_irqrestore(&priv->lock, flags);
1036 	ipoib_neigh_put(neigh);
1037 
1038 	return NULL;
1039 }
1040 
1041 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1042 			     struct ipoib_pseudo_header *phdr)
1043 {
1044 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1045 	struct rdma_netdev *rn = netdev_priv(dev);
1046 	struct ipoib_path *path;
1047 	unsigned long flags;
1048 
1049 	spin_lock_irqsave(&priv->lock, flags);
1050 
1051 	/* no broadcast means that all paths are (going to be) not valid */
1052 	if (!priv->broadcast)
1053 		goto drop_and_unlock;
1054 
1055 	path = __path_find(dev, phdr->hwaddr + 4);
1056 	if (!path || !path->ah || !path->ah->valid) {
1057 		if (!path) {
1058 			path = path_rec_create(dev, phdr->hwaddr + 4);
1059 			if (!path)
1060 				goto drop_and_unlock;
1061 			__path_add(dev, path);
1062 		} else {
1063 			/*
1064 			 * make sure there are no changes in the existing
1065 			 * path record
1066 			 */
1067 			init_path_rec(priv, path, phdr->hwaddr + 4);
1068 		}
1069 		if (!path->query && path_rec_start(dev, path)) {
1070 			goto drop_and_unlock;
1071 		}
1072 
1073 		if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1074 			push_pseudo_header(skb, phdr->hwaddr);
1075 			__skb_queue_tail(&path->queue, skb);
1076 			goto unlock;
1077 		} else {
1078 			goto drop_and_unlock;
1079 		}
1080 	}
1081 
1082 	spin_unlock_irqrestore(&priv->lock, flags);
1083 	ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1084 		  be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1085 	path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1086 				       IPOIB_QPN(phdr->hwaddr));
1087 	return;
1088 
1089 drop_and_unlock:
1090 	++dev->stats.tx_dropped;
1091 	dev_kfree_skb_any(skb);
1092 unlock:
1093 	spin_unlock_irqrestore(&priv->lock, flags);
1094 }
1095 
1096 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1097 {
1098 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1099 	struct rdma_netdev *rn = netdev_priv(dev);
1100 	struct ipoib_neigh *neigh;
1101 	struct ipoib_pseudo_header *phdr;
1102 	struct ipoib_header *header;
1103 	unsigned long flags;
1104 
1105 	phdr = (struct ipoib_pseudo_header *) skb->data;
1106 	skb_pull(skb, sizeof(*phdr));
1107 	header = (struct ipoib_header *) skb->data;
1108 
1109 	if (unlikely(phdr->hwaddr[4] == 0xff)) {
1110 		/* multicast, arrange "if" according to probability */
1111 		if ((header->proto != htons(ETH_P_IP)) &&
1112 		    (header->proto != htons(ETH_P_IPV6)) &&
1113 		    (header->proto != htons(ETH_P_ARP)) &&
1114 		    (header->proto != htons(ETH_P_RARP)) &&
1115 		    (header->proto != htons(ETH_P_TIPC))) {
1116 			/* ethertype not supported by IPoIB */
1117 			++dev->stats.tx_dropped;
1118 			dev_kfree_skb_any(skb);
1119 			return NETDEV_TX_OK;
1120 		}
1121 		/* Add in the P_Key for multicast*/
1122 		phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1123 		phdr->hwaddr[9] = priv->pkey & 0xff;
1124 
1125 		neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1126 		if (likely(neigh))
1127 			goto send_using_neigh;
1128 		ipoib_mcast_send(dev, phdr->hwaddr, skb);
1129 		return NETDEV_TX_OK;
1130 	}
1131 
1132 	/* unicast, arrange "switch" according to probability */
1133 	switch (header->proto) {
1134 	case htons(ETH_P_IP):
1135 	case htons(ETH_P_IPV6):
1136 	case htons(ETH_P_TIPC):
1137 		neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1138 		if (unlikely(!neigh)) {
1139 			neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1140 			if (likely(!neigh))
1141 				return NETDEV_TX_OK;
1142 		}
1143 		break;
1144 	case htons(ETH_P_ARP):
1145 	case htons(ETH_P_RARP):
1146 		/* for unicast ARP and RARP should always perform path find */
1147 		unicast_arp_send(skb, dev, phdr);
1148 		return NETDEV_TX_OK;
1149 	default:
1150 		/* ethertype not supported by IPoIB */
1151 		++dev->stats.tx_dropped;
1152 		dev_kfree_skb_any(skb);
1153 		return NETDEV_TX_OK;
1154 	}
1155 
1156 send_using_neigh:
1157 	/* note we now hold a ref to neigh */
1158 	if (ipoib_cm_get(neigh)) {
1159 		if (ipoib_cm_up(neigh)) {
1160 			ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1161 			goto unref;
1162 		}
1163 	} else if (neigh->ah && neigh->ah->valid) {
1164 		neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1165 						IPOIB_QPN(phdr->hwaddr));
1166 		goto unref;
1167 	} else if (neigh->ah) {
1168 		neigh_refresh_path(neigh, phdr->hwaddr, dev);
1169 	}
1170 
1171 	if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1172 		push_pseudo_header(skb, phdr->hwaddr);
1173 		spin_lock_irqsave(&priv->lock, flags);
1174 		__skb_queue_tail(&neigh->queue, skb);
1175 		spin_unlock_irqrestore(&priv->lock, flags);
1176 	} else {
1177 		++dev->stats.tx_dropped;
1178 		dev_kfree_skb_any(skb);
1179 	}
1180 
1181 unref:
1182 	ipoib_neigh_put(neigh);
1183 
1184 	return NETDEV_TX_OK;
1185 }
1186 
1187 static void ipoib_timeout(struct net_device *dev, unsigned int txqueue)
1188 {
1189 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1190 	struct rdma_netdev *rn = netdev_priv(dev);
1191 
1192 	if (rn->tx_timeout) {
1193 		rn->tx_timeout(dev, txqueue);
1194 		return;
1195 	}
1196 	ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1197 		   jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1198 	ipoib_warn(priv,
1199 		   "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n",
1200 		   netif_queue_stopped(dev), priv->tx_head, priv->tx_tail,
1201 		   priv->global_tx_head, priv->global_tx_tail);
1202 
1203 	/* XXX reset QP, etc. */
1204 }
1205 
1206 static int ipoib_hard_header(struct sk_buff *skb,
1207 			     struct net_device *dev,
1208 			     unsigned short type,
1209 			     const void *daddr,
1210 			     const void *saddr,
1211 			     unsigned int len)
1212 {
1213 	struct ipoib_header *header;
1214 
1215 	header = skb_push(skb, sizeof(*header));
1216 
1217 	header->proto = htons(type);
1218 	header->reserved = 0;
1219 
1220 	/*
1221 	 * we don't rely on dst_entry structure,  always stuff the
1222 	 * destination address into skb hard header so we can figure out where
1223 	 * to send the packet later.
1224 	 */
1225 	push_pseudo_header(skb, daddr);
1226 
1227 	return IPOIB_HARD_LEN;
1228 }
1229 
1230 static void ipoib_set_mcast_list(struct net_device *dev)
1231 {
1232 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1233 
1234 	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1235 		ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1236 		return;
1237 	}
1238 
1239 	queue_work(priv->wq, &priv->restart_task);
1240 }
1241 
1242 static int ipoib_get_iflink(const struct net_device *dev)
1243 {
1244 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1245 
1246 	/* parent interface */
1247 	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1248 		return dev->ifindex;
1249 
1250 	/* child/vlan interface */
1251 	return priv->parent->ifindex;
1252 }
1253 
1254 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1255 {
1256 	/*
1257 	 * Use only the address parts that contributes to spreading
1258 	 * The subnet prefix is not used as one can not connect to
1259 	 * same remote port (GUID) using the same remote QPN via two
1260 	 * different subnets.
1261 	 */
1262 	 /* qpn octets[1:4) & port GUID octets[12:20) */
1263 	u32 *d32 = (u32 *) daddr;
1264 	u32 hv;
1265 
1266 	hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1267 	return hv & htbl->mask;
1268 }
1269 
1270 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1271 {
1272 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1273 	struct ipoib_neigh_table *ntbl = &priv->ntbl;
1274 	struct ipoib_neigh_hash *htbl;
1275 	struct ipoib_neigh *neigh = NULL;
1276 	u32 hash_val;
1277 
1278 	rcu_read_lock_bh();
1279 
1280 	htbl = rcu_dereference_bh(ntbl->htbl);
1281 
1282 	if (!htbl)
1283 		goto out_unlock;
1284 
1285 	hash_val = ipoib_addr_hash(htbl, daddr);
1286 	for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1287 	     neigh != NULL;
1288 	     neigh = rcu_dereference_bh(neigh->hnext)) {
1289 		if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1290 			/* found, take one ref on behalf of the caller */
1291 			if (!refcount_inc_not_zero(&neigh->refcnt)) {
1292 				/* deleted */
1293 				neigh = NULL;
1294 				goto out_unlock;
1295 			}
1296 
1297 			if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1298 				neigh->alive = jiffies;
1299 			goto out_unlock;
1300 		}
1301 	}
1302 
1303 out_unlock:
1304 	rcu_read_unlock_bh();
1305 	return neigh;
1306 }
1307 
1308 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1309 {
1310 	struct ipoib_neigh_table *ntbl = &priv->ntbl;
1311 	struct ipoib_neigh_hash *htbl;
1312 	unsigned long neigh_obsolete;
1313 	unsigned long dt;
1314 	unsigned long flags;
1315 	int i;
1316 	LIST_HEAD(remove_list);
1317 
1318 	spin_lock_irqsave(&priv->lock, flags);
1319 
1320 	htbl = rcu_dereference_protected(ntbl->htbl,
1321 					 lockdep_is_held(&priv->lock));
1322 
1323 	if (!htbl)
1324 		goto out_unlock;
1325 
1326 	/* neigh is obsolete if it was idle for two GC periods */
1327 	dt = 2 * arp_tbl.gc_interval;
1328 	neigh_obsolete = jiffies - dt;
1329 
1330 	for (i = 0; i < htbl->size; i++) {
1331 		struct ipoib_neigh *neigh;
1332 		struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1333 
1334 		while ((neigh = rcu_dereference_protected(*np,
1335 							  lockdep_is_held(&priv->lock))) != NULL) {
1336 			/* was the neigh idle for two GC periods */
1337 			if (time_after(neigh_obsolete, neigh->alive)) {
1338 
1339 				ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1340 
1341 				rcu_assign_pointer(*np,
1342 						   rcu_dereference_protected(neigh->hnext,
1343 									     lockdep_is_held(&priv->lock)));
1344 				/* remove from path/mc list */
1345 				list_del_init(&neigh->list);
1346 				call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1347 			} else {
1348 				np = &neigh->hnext;
1349 			}
1350 
1351 		}
1352 	}
1353 
1354 out_unlock:
1355 	spin_unlock_irqrestore(&priv->lock, flags);
1356 	ipoib_mcast_remove_list(&remove_list);
1357 }
1358 
1359 static void ipoib_reap_neigh(struct work_struct *work)
1360 {
1361 	struct ipoib_dev_priv *priv =
1362 		container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1363 
1364 	__ipoib_reap_neigh(priv);
1365 
1366 	queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1367 			   arp_tbl.gc_interval);
1368 }
1369 
1370 
1371 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1372 				      struct net_device *dev)
1373 {
1374 	struct ipoib_neigh *neigh;
1375 
1376 	neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
1377 	if (!neigh)
1378 		return NULL;
1379 
1380 	neigh->dev = dev;
1381 	memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1382 	skb_queue_head_init(&neigh->queue);
1383 	INIT_LIST_HEAD(&neigh->list);
1384 	ipoib_cm_set(neigh, NULL);
1385 	/* one ref on behalf of the caller */
1386 	refcount_set(&neigh->refcnt, 1);
1387 
1388 	return neigh;
1389 }
1390 
1391 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1392 				      struct net_device *dev)
1393 {
1394 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1395 	struct ipoib_neigh_table *ntbl = &priv->ntbl;
1396 	struct ipoib_neigh_hash *htbl;
1397 	struct ipoib_neigh *neigh;
1398 	u32 hash_val;
1399 
1400 	htbl = rcu_dereference_protected(ntbl->htbl,
1401 					 lockdep_is_held(&priv->lock));
1402 	if (!htbl) {
1403 		neigh = NULL;
1404 		goto out_unlock;
1405 	}
1406 
1407 	/* need to add a new neigh, but maybe some other thread succeeded?
1408 	 * recalc hash, maybe hash resize took place so we do a search
1409 	 */
1410 	hash_val = ipoib_addr_hash(htbl, daddr);
1411 	for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1412 					       lockdep_is_held(&priv->lock));
1413 	     neigh != NULL;
1414 	     neigh = rcu_dereference_protected(neigh->hnext,
1415 					       lockdep_is_held(&priv->lock))) {
1416 		if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1417 			/* found, take one ref on behalf of the caller */
1418 			if (!refcount_inc_not_zero(&neigh->refcnt)) {
1419 				/* deleted */
1420 				neigh = NULL;
1421 				break;
1422 			}
1423 			neigh->alive = jiffies;
1424 			goto out_unlock;
1425 		}
1426 	}
1427 
1428 	neigh = ipoib_neigh_ctor(daddr, dev);
1429 	if (!neigh)
1430 		goto out_unlock;
1431 
1432 	/* one ref on behalf of the hash table */
1433 	refcount_inc(&neigh->refcnt);
1434 	neigh->alive = jiffies;
1435 	/* put in hash */
1436 	rcu_assign_pointer(neigh->hnext,
1437 			   rcu_dereference_protected(htbl->buckets[hash_val],
1438 						     lockdep_is_held(&priv->lock)));
1439 	rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1440 	atomic_inc(&ntbl->entries);
1441 
1442 out_unlock:
1443 
1444 	return neigh;
1445 }
1446 
1447 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1448 {
1449 	/* neigh reference count was dropprd to zero */
1450 	struct net_device *dev = neigh->dev;
1451 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1452 	struct sk_buff *skb;
1453 	if (neigh->ah)
1454 		ipoib_put_ah(neigh->ah);
1455 	while ((skb = __skb_dequeue(&neigh->queue))) {
1456 		++dev->stats.tx_dropped;
1457 		dev_kfree_skb_any(skb);
1458 	}
1459 	if (ipoib_cm_get(neigh))
1460 		ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1461 	ipoib_dbg(ipoib_priv(dev),
1462 		  "neigh free for %06x %pI6\n",
1463 		  IPOIB_QPN(neigh->daddr),
1464 		  neigh->daddr + 4);
1465 	kfree(neigh);
1466 	if (atomic_dec_and_test(&priv->ntbl.entries)) {
1467 		if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1468 			complete(&priv->ntbl.flushed);
1469 	}
1470 }
1471 
1472 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1473 {
1474 	/* Called as a result of removal from hash table */
1475 	struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1476 	/* note TX context may hold another ref */
1477 	ipoib_neigh_put(neigh);
1478 }
1479 
1480 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1481 {
1482 	struct net_device *dev = neigh->dev;
1483 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1484 	struct ipoib_neigh_table *ntbl = &priv->ntbl;
1485 	struct ipoib_neigh_hash *htbl;
1486 	struct ipoib_neigh __rcu **np;
1487 	struct ipoib_neigh *n;
1488 	u32 hash_val;
1489 
1490 	htbl = rcu_dereference_protected(ntbl->htbl,
1491 					lockdep_is_held(&priv->lock));
1492 	if (!htbl)
1493 		return;
1494 
1495 	hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1496 	np = &htbl->buckets[hash_val];
1497 	for (n = rcu_dereference_protected(*np,
1498 					    lockdep_is_held(&priv->lock));
1499 	     n != NULL;
1500 	     n = rcu_dereference_protected(*np,
1501 					lockdep_is_held(&priv->lock))) {
1502 		if (n == neigh) {
1503 			/* found */
1504 			rcu_assign_pointer(*np,
1505 					   rcu_dereference_protected(neigh->hnext,
1506 								     lockdep_is_held(&priv->lock)));
1507 			/* remove from parent list */
1508 			list_del_init(&neigh->list);
1509 			call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1510 			return;
1511 		} else {
1512 			np = &n->hnext;
1513 		}
1514 	}
1515 }
1516 
1517 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1518 {
1519 	struct ipoib_neigh_table *ntbl = &priv->ntbl;
1520 	struct ipoib_neigh_hash *htbl;
1521 	struct ipoib_neigh __rcu **buckets;
1522 	u32 size;
1523 
1524 	clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1525 	ntbl->htbl = NULL;
1526 	htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1527 	if (!htbl)
1528 		return -ENOMEM;
1529 	size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1530 	buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
1531 	if (!buckets) {
1532 		kfree(htbl);
1533 		return -ENOMEM;
1534 	}
1535 	htbl->size = size;
1536 	htbl->mask = (size - 1);
1537 	htbl->buckets = buckets;
1538 	RCU_INIT_POINTER(ntbl->htbl, htbl);
1539 	htbl->ntbl = ntbl;
1540 	atomic_set(&ntbl->entries, 0);
1541 
1542 	/* start garbage collection */
1543 	queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1544 			   arp_tbl.gc_interval);
1545 
1546 	return 0;
1547 }
1548 
1549 static void neigh_hash_free_rcu(struct rcu_head *head)
1550 {
1551 	struct ipoib_neigh_hash *htbl = container_of(head,
1552 						    struct ipoib_neigh_hash,
1553 						    rcu);
1554 	struct ipoib_neigh __rcu **buckets = htbl->buckets;
1555 	struct ipoib_neigh_table *ntbl = htbl->ntbl;
1556 
1557 	kvfree(buckets);
1558 	kfree(htbl);
1559 	complete(&ntbl->deleted);
1560 }
1561 
1562 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1563 {
1564 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1565 	struct ipoib_neigh_table *ntbl = &priv->ntbl;
1566 	struct ipoib_neigh_hash *htbl;
1567 	unsigned long flags;
1568 	int i;
1569 
1570 	/* remove all neigh connected to a given path or mcast */
1571 	spin_lock_irqsave(&priv->lock, flags);
1572 
1573 	htbl = rcu_dereference_protected(ntbl->htbl,
1574 					 lockdep_is_held(&priv->lock));
1575 
1576 	if (!htbl)
1577 		goto out_unlock;
1578 
1579 	for (i = 0; i < htbl->size; i++) {
1580 		struct ipoib_neigh *neigh;
1581 		struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1582 
1583 		while ((neigh = rcu_dereference_protected(*np,
1584 							  lockdep_is_held(&priv->lock))) != NULL) {
1585 			/* delete neighs belong to this parent */
1586 			if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1587 				rcu_assign_pointer(*np,
1588 						   rcu_dereference_protected(neigh->hnext,
1589 									     lockdep_is_held(&priv->lock)));
1590 				/* remove from parent list */
1591 				list_del_init(&neigh->list);
1592 				call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1593 			} else {
1594 				np = &neigh->hnext;
1595 			}
1596 
1597 		}
1598 	}
1599 out_unlock:
1600 	spin_unlock_irqrestore(&priv->lock, flags);
1601 }
1602 
1603 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1604 {
1605 	struct ipoib_neigh_table *ntbl = &priv->ntbl;
1606 	struct ipoib_neigh_hash *htbl;
1607 	unsigned long flags;
1608 	int i, wait_flushed = 0;
1609 
1610 	init_completion(&priv->ntbl.flushed);
1611 	set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1612 
1613 	spin_lock_irqsave(&priv->lock, flags);
1614 
1615 	htbl = rcu_dereference_protected(ntbl->htbl,
1616 					lockdep_is_held(&priv->lock));
1617 	if (!htbl)
1618 		goto out_unlock;
1619 
1620 	wait_flushed = atomic_read(&priv->ntbl.entries);
1621 	if (!wait_flushed)
1622 		goto free_htbl;
1623 
1624 	for (i = 0; i < htbl->size; i++) {
1625 		struct ipoib_neigh *neigh;
1626 		struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1627 
1628 		while ((neigh = rcu_dereference_protected(*np,
1629 				       lockdep_is_held(&priv->lock))) != NULL) {
1630 			rcu_assign_pointer(*np,
1631 					   rcu_dereference_protected(neigh->hnext,
1632 								     lockdep_is_held(&priv->lock)));
1633 			/* remove from path/mc list */
1634 			list_del_init(&neigh->list);
1635 			call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1636 		}
1637 	}
1638 
1639 free_htbl:
1640 	rcu_assign_pointer(ntbl->htbl, NULL);
1641 	call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1642 
1643 out_unlock:
1644 	spin_unlock_irqrestore(&priv->lock, flags);
1645 	if (wait_flushed)
1646 		wait_for_completion(&priv->ntbl.flushed);
1647 }
1648 
1649 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1650 {
1651 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1652 
1653 	ipoib_dbg(priv, "%s\n", __func__);
1654 	init_completion(&priv->ntbl.deleted);
1655 
1656 	cancel_delayed_work_sync(&priv->neigh_reap_task);
1657 
1658 	ipoib_flush_neighs(priv);
1659 
1660 	wait_for_completion(&priv->ntbl.deleted);
1661 }
1662 
1663 static void ipoib_napi_add(struct net_device *dev)
1664 {
1665 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1666 
1667 	netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
1668 	netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
1669 }
1670 
1671 static void ipoib_napi_del(struct net_device *dev)
1672 {
1673 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1674 
1675 	netif_napi_del(&priv->recv_napi);
1676 	netif_napi_del(&priv->send_napi);
1677 }
1678 
1679 static void ipoib_dev_uninit_default(struct net_device *dev)
1680 {
1681 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1682 
1683 	ipoib_transport_dev_cleanup(dev);
1684 
1685 	ipoib_napi_del(dev);
1686 
1687 	ipoib_cm_dev_cleanup(dev);
1688 
1689 	kfree(priv->rx_ring);
1690 	vfree(priv->tx_ring);
1691 
1692 	priv->rx_ring = NULL;
1693 	priv->tx_ring = NULL;
1694 }
1695 
1696 static int ipoib_dev_init_default(struct net_device *dev)
1697 {
1698 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1699 
1700 	ipoib_napi_add(dev);
1701 
1702 	/* Allocate RX/TX "rings" to hold queued skbs */
1703 	priv->rx_ring =	kcalloc(ipoib_recvq_size,
1704 				       sizeof(*priv->rx_ring),
1705 				       GFP_KERNEL);
1706 	if (!priv->rx_ring)
1707 		goto out;
1708 
1709 	priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
1710 					   sizeof(*priv->tx_ring)));
1711 	if (!priv->tx_ring) {
1712 		pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1713 			priv->ca->name, ipoib_sendq_size);
1714 		goto out_rx_ring_cleanup;
1715 	}
1716 
1717 	/* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */
1718 
1719 	if (ipoib_transport_dev_init(dev, priv->ca)) {
1720 		pr_warn("%s: ipoib_transport_dev_init failed\n",
1721 			priv->ca->name);
1722 		goto out_tx_ring_cleanup;
1723 	}
1724 
1725 	/* after qp created set dev address */
1726 	priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
1727 	priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
1728 	priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
1729 
1730 	return 0;
1731 
1732 out_tx_ring_cleanup:
1733 	vfree(priv->tx_ring);
1734 
1735 out_rx_ring_cleanup:
1736 	kfree(priv->rx_ring);
1737 
1738 out:
1739 	ipoib_napi_del(dev);
1740 	return -ENOMEM;
1741 }
1742 
1743 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1744 		       int cmd)
1745 {
1746 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1747 
1748 	if (!priv->rn_ops->ndo_do_ioctl)
1749 		return -EOPNOTSUPP;
1750 
1751 	return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd);
1752 }
1753 
1754 static int ipoib_dev_init(struct net_device *dev)
1755 {
1756 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1757 	int ret = -ENOMEM;
1758 
1759 	priv->qp = NULL;
1760 
1761 	/*
1762 	 * the various IPoIB tasks assume they will never race against
1763 	 * themselves, so always use a single thread workqueue
1764 	 */
1765 	priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1766 	if (!priv->wq) {
1767 		pr_warn("%s: failed to allocate device WQ\n", dev->name);
1768 		goto out;
1769 	}
1770 
1771 	/* create pd, which used both for control and datapath*/
1772 	priv->pd = ib_alloc_pd(priv->ca, 0);
1773 	if (IS_ERR(priv->pd)) {
1774 		pr_warn("%s: failed to allocate PD\n", priv->ca->name);
1775 		goto clean_wq;
1776 	}
1777 
1778 	ret = priv->rn_ops->ndo_init(dev);
1779 	if (ret) {
1780 		pr_warn("%s failed to init HW resource\n", dev->name);
1781 		goto out_free_pd;
1782 	}
1783 
1784 	ret = ipoib_neigh_hash_init(priv);
1785 	if (ret) {
1786 		pr_warn("%s failed to init neigh hash\n", dev->name);
1787 		goto out_dev_uninit;
1788 	}
1789 
1790 	if (dev->flags & IFF_UP) {
1791 		if (ipoib_ib_dev_open(dev)) {
1792 			pr_warn("%s failed to open device\n", dev->name);
1793 			ret = -ENODEV;
1794 			goto out_hash_uninit;
1795 		}
1796 	}
1797 
1798 	return 0;
1799 
1800 out_hash_uninit:
1801 	ipoib_neigh_hash_uninit(dev);
1802 
1803 out_dev_uninit:
1804 	ipoib_ib_dev_cleanup(dev);
1805 
1806 out_free_pd:
1807 	if (priv->pd) {
1808 		ib_dealloc_pd(priv->pd);
1809 		priv->pd = NULL;
1810 	}
1811 
1812 clean_wq:
1813 	if (priv->wq) {
1814 		destroy_workqueue(priv->wq);
1815 		priv->wq = NULL;
1816 	}
1817 
1818 out:
1819 	return ret;
1820 }
1821 
1822 /*
1823  * This must be called before doing an unregister_netdev on a parent device to
1824  * shutdown the IB event handler.
1825  */
1826 static void ipoib_parent_unregister_pre(struct net_device *ndev)
1827 {
1828 	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1829 
1830 	/*
1831 	 * ipoib_set_mac checks netif_running before pushing work, clearing
1832 	 * running ensures the it will not add more work.
1833 	 */
1834 	rtnl_lock();
1835 	dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL);
1836 	rtnl_unlock();
1837 
1838 	/* ipoib_event() cannot be running once this returns */
1839 	ib_unregister_event_handler(&priv->event_handler);
1840 
1841 	/*
1842 	 * Work on the queue grabs the rtnl lock, so this cannot be done while
1843 	 * also holding it.
1844 	 */
1845 	flush_workqueue(ipoib_workqueue);
1846 }
1847 
1848 static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
1849 {
1850 	priv->hca_caps = priv->ca->attrs.device_cap_flags;
1851 
1852 	if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1853 		priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1854 
1855 		if (priv->hca_caps & IB_DEVICE_UD_TSO)
1856 			priv->dev->hw_features |= NETIF_F_TSO;
1857 
1858 		priv->dev->features |= priv->dev->hw_features;
1859 	}
1860 }
1861 
1862 static int ipoib_parent_init(struct net_device *ndev)
1863 {
1864 	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1865 	struct ib_port_attr attr;
1866 	int result;
1867 
1868 	result = ib_query_port(priv->ca, priv->port, &attr);
1869 	if (result) {
1870 		pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
1871 			priv->port);
1872 		return result;
1873 	}
1874 	priv->max_ib_mtu = rdma_mtu_from_attr(priv->ca, priv->port, &attr);
1875 
1876 	result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1877 	if (result) {
1878 		pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
1879 			priv->ca->name, priv->port, result);
1880 		return result;
1881 	}
1882 
1883 	result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
1884 	if (result) {
1885 		pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
1886 			priv->ca->name, priv->port, result);
1887 		return result;
1888 	}
1889 	memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
1890 	       sizeof(union ib_gid));
1891 
1892 	SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
1893 	priv->dev->dev_port = priv->port - 1;
1894 	/* Let's set this one too for backwards compatibility. */
1895 	priv->dev->dev_id = priv->port - 1;
1896 
1897 	return 0;
1898 }
1899 
1900 static void ipoib_child_init(struct net_device *ndev)
1901 {
1902 	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1903 	struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1904 
1905 	priv->max_ib_mtu = ppriv->max_ib_mtu;
1906 	set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
1907 	if (memchr_inv(priv->dev->dev_addr, 0, INFINIBAND_ALEN))
1908 		memcpy(&priv->local_gid, priv->dev->dev_addr + 4,
1909 		       sizeof(priv->local_gid));
1910 	else {
1911 		memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr,
1912 		       INFINIBAND_ALEN);
1913 		memcpy(&priv->local_gid, &ppriv->local_gid,
1914 		       sizeof(priv->local_gid));
1915 	}
1916 }
1917 
1918 static int ipoib_ndo_init(struct net_device *ndev)
1919 {
1920 	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1921 	int rc;
1922 	struct rdma_netdev *rn = netdev_priv(ndev);
1923 
1924 	if (priv->parent) {
1925 		ipoib_child_init(ndev);
1926 	} else {
1927 		rc = ipoib_parent_init(ndev);
1928 		if (rc)
1929 			return rc;
1930 	}
1931 
1932 	/* MTU will be reset when mcast join happens */
1933 	ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1934 	priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
1935 	rn->mtu = priv->mcast_mtu;
1936 	ndev->max_mtu = IPOIB_CM_MTU;
1937 
1938 	ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
1939 
1940 	/*
1941 	 * Set the full membership bit, so that we join the right
1942 	 * broadcast group, etc.
1943 	 */
1944 	priv->pkey |= 0x8000;
1945 
1946 	ndev->broadcast[8] = priv->pkey >> 8;
1947 	ndev->broadcast[9] = priv->pkey & 0xff;
1948 	set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1949 
1950 	ipoib_set_dev_features(priv);
1951 
1952 	rc = ipoib_dev_init(ndev);
1953 	if (rc) {
1954 		pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
1955 			priv->ca->name, priv->dev->name, priv->port, rc);
1956 		return rc;
1957 	}
1958 
1959 	if (priv->parent) {
1960 		struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1961 
1962 		dev_hold(priv->parent);
1963 
1964 		down_write(&ppriv->vlan_rwsem);
1965 		list_add_tail(&priv->list, &ppriv->child_intfs);
1966 		up_write(&ppriv->vlan_rwsem);
1967 	}
1968 
1969 	return 0;
1970 }
1971 
1972 static void ipoib_ndo_uninit(struct net_device *dev)
1973 {
1974 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1975 
1976 	ASSERT_RTNL();
1977 
1978 	/*
1979 	 * ipoib_remove_one guarantees the children are removed before the
1980 	 * parent, and that is the only place where a parent can be removed.
1981 	 */
1982 	WARN_ON(!list_empty(&priv->child_intfs));
1983 
1984 	if (priv->parent) {
1985 		struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1986 
1987 		down_write(&ppriv->vlan_rwsem);
1988 		list_del(&priv->list);
1989 		up_write(&ppriv->vlan_rwsem);
1990 	}
1991 
1992 	ipoib_neigh_hash_uninit(dev);
1993 
1994 	ipoib_ib_dev_cleanup(dev);
1995 
1996 	/* no more works over the priv->wq */
1997 	if (priv->wq) {
1998 		/* See ipoib_mcast_carrier_on_task() */
1999 		WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags));
2000 		flush_workqueue(priv->wq);
2001 		destroy_workqueue(priv->wq);
2002 		priv->wq = NULL;
2003 	}
2004 
2005 	if (priv->parent)
2006 		dev_put(priv->parent);
2007 }
2008 
2009 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
2010 {
2011 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
2012 
2013 	return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
2014 }
2015 
2016 static int ipoib_get_vf_config(struct net_device *dev, int vf,
2017 			       struct ifla_vf_info *ivf)
2018 {
2019 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
2020 	int err;
2021 
2022 	err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
2023 	if (err)
2024 		return err;
2025 
2026 	ivf->vf = vf;
2027 	memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
2028 
2029 	return 0;
2030 }
2031 
2032 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
2033 {
2034 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
2035 
2036 	if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
2037 		return -EINVAL;
2038 
2039 	return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
2040 }
2041 
2042 static int ipoib_get_vf_guid(struct net_device *dev, int vf,
2043 			     struct ifla_vf_guid *node_guid,
2044 			     struct ifla_vf_guid *port_guid)
2045 {
2046 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
2047 
2048 	return ib_get_vf_guid(priv->ca, vf, priv->port, node_guid, port_guid);
2049 }
2050 
2051 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
2052 			      struct ifla_vf_stats *vf_stats)
2053 {
2054 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
2055 
2056 	return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
2057 }
2058 
2059 static const struct header_ops ipoib_header_ops = {
2060 	.create	= ipoib_hard_header,
2061 };
2062 
2063 static const struct net_device_ops ipoib_netdev_ops_pf = {
2064 	.ndo_init		 = ipoib_ndo_init,
2065 	.ndo_uninit		 = ipoib_ndo_uninit,
2066 	.ndo_open		 = ipoib_open,
2067 	.ndo_stop		 = ipoib_stop,
2068 	.ndo_change_mtu		 = ipoib_change_mtu,
2069 	.ndo_fix_features	 = ipoib_fix_features,
2070 	.ndo_start_xmit		 = ipoib_start_xmit,
2071 	.ndo_tx_timeout		 = ipoib_timeout,
2072 	.ndo_set_rx_mode	 = ipoib_set_mcast_list,
2073 	.ndo_get_iflink		 = ipoib_get_iflink,
2074 	.ndo_set_vf_link_state	 = ipoib_set_vf_link_state,
2075 	.ndo_get_vf_config	 = ipoib_get_vf_config,
2076 	.ndo_get_vf_stats	 = ipoib_get_vf_stats,
2077 	.ndo_get_vf_guid	 = ipoib_get_vf_guid,
2078 	.ndo_set_vf_guid	 = ipoib_set_vf_guid,
2079 	.ndo_set_mac_address	 = ipoib_set_mac,
2080 	.ndo_get_stats64	 = ipoib_get_stats,
2081 	.ndo_do_ioctl		 = ipoib_ioctl,
2082 };
2083 
2084 static const struct net_device_ops ipoib_netdev_ops_vf = {
2085 	.ndo_init		 = ipoib_ndo_init,
2086 	.ndo_uninit		 = ipoib_ndo_uninit,
2087 	.ndo_open		 = ipoib_open,
2088 	.ndo_stop		 = ipoib_stop,
2089 	.ndo_change_mtu		 = ipoib_change_mtu,
2090 	.ndo_fix_features	 = ipoib_fix_features,
2091 	.ndo_start_xmit	 	 = ipoib_start_xmit,
2092 	.ndo_tx_timeout		 = ipoib_timeout,
2093 	.ndo_set_rx_mode	 = ipoib_set_mcast_list,
2094 	.ndo_get_iflink		 = ipoib_get_iflink,
2095 	.ndo_get_stats64	 = ipoib_get_stats,
2096 	.ndo_do_ioctl		 = ipoib_ioctl,
2097 };
2098 
2099 static const struct net_device_ops ipoib_netdev_default_pf = {
2100 	.ndo_init		 = ipoib_dev_init_default,
2101 	.ndo_uninit		 = ipoib_dev_uninit_default,
2102 	.ndo_open		 = ipoib_ib_dev_open_default,
2103 	.ndo_stop		 = ipoib_ib_dev_stop_default,
2104 };
2105 
2106 void ipoib_setup_common(struct net_device *dev)
2107 {
2108 	dev->header_ops		 = &ipoib_header_ops;
2109 	dev->netdev_ops          = &ipoib_netdev_default_pf;
2110 
2111 	ipoib_set_ethtool_ops(dev);
2112 
2113 	dev->watchdog_timeo	 = HZ;
2114 
2115 	dev->flags		|= IFF_BROADCAST | IFF_MULTICAST;
2116 
2117 	dev->hard_header_len	 = IPOIB_HARD_LEN;
2118 	dev->addr_len		 = INFINIBAND_ALEN;
2119 	dev->type		 = ARPHRD_INFINIBAND;
2120 	dev->tx_queue_len	 = ipoib_sendq_size * 2;
2121 	dev->features		 = (NETIF_F_VLAN_CHALLENGED	|
2122 				    NETIF_F_HIGHDMA);
2123 	netif_keep_dst(dev);
2124 
2125 	memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
2126 
2127 	/*
2128 	 * unregister_netdev always frees the netdev, we use this mode
2129 	 * consistently to unify all the various unregister paths, including
2130 	 * those connected to rtnl_link_ops which require it.
2131 	 */
2132 	dev->needs_free_netdev = true;
2133 }
2134 
2135 static void ipoib_build_priv(struct net_device *dev)
2136 {
2137 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
2138 
2139 	priv->dev = dev;
2140 	spin_lock_init(&priv->lock);
2141 	init_rwsem(&priv->vlan_rwsem);
2142 	mutex_init(&priv->mcast_mutex);
2143 
2144 	INIT_LIST_HEAD(&priv->path_list);
2145 	INIT_LIST_HEAD(&priv->child_intfs);
2146 	INIT_LIST_HEAD(&priv->dead_ahs);
2147 	INIT_LIST_HEAD(&priv->multicast_list);
2148 
2149 	INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
2150 	INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
2151 	INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
2152 	INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
2153 	INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
2154 	INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
2155 	INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
2156 	INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
2157 }
2158 
2159 static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u32 port,
2160 					     const char *name)
2161 {
2162 	struct net_device *dev;
2163 
2164 	dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2165 				NET_NAME_UNKNOWN, ipoib_setup_common);
2166 	if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP)
2167 		return dev;
2168 
2169 	dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN,
2170 			   ipoib_setup_common);
2171 	if (!dev)
2172 		return ERR_PTR(-ENOMEM);
2173 	return dev;
2174 }
2175 
2176 int ipoib_intf_init(struct ib_device *hca, u32 port, const char *name,
2177 		    struct net_device *dev)
2178 {
2179 	struct rdma_netdev *rn = netdev_priv(dev);
2180 	struct ipoib_dev_priv *priv;
2181 	int rc;
2182 
2183 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2184 	if (!priv)
2185 		return -ENOMEM;
2186 
2187 	priv->ca = hca;
2188 	priv->port = port;
2189 
2190 	rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2191 			      NET_NAME_UNKNOWN, ipoib_setup_common, dev);
2192 	if (rc) {
2193 		if (rc != -EOPNOTSUPP)
2194 			goto out;
2195 
2196 		rn->send = ipoib_send;
2197 		rn->attach_mcast = ipoib_mcast_attach;
2198 		rn->detach_mcast = ipoib_mcast_detach;
2199 		rn->hca = hca;
2200 	}
2201 
2202 	priv->rn_ops = dev->netdev_ops;
2203 
2204 	if (hca->attrs.device_cap_flags & IB_DEVICE_VIRTUAL_FUNCTION)
2205 		dev->netdev_ops	= &ipoib_netdev_ops_vf;
2206 	else
2207 		dev->netdev_ops	= &ipoib_netdev_ops_pf;
2208 
2209 	rn->clnt_priv = priv;
2210 	/*
2211 	 * Only the child register_netdev flows can handle priv_destructor
2212 	 * being set, so we force it to NULL here and handle manually until it
2213 	 * is safe to turn on.
2214 	 */
2215 	priv->next_priv_destructor = dev->priv_destructor;
2216 	dev->priv_destructor = NULL;
2217 
2218 	ipoib_build_priv(dev);
2219 
2220 	return 0;
2221 
2222 out:
2223 	kfree(priv);
2224 	return rc;
2225 }
2226 
2227 struct net_device *ipoib_intf_alloc(struct ib_device *hca, u32 port,
2228 				    const char *name)
2229 {
2230 	struct net_device *dev;
2231 	int rc;
2232 
2233 	dev = ipoib_alloc_netdev(hca, port, name);
2234 	if (IS_ERR(dev))
2235 		return dev;
2236 
2237 	rc = ipoib_intf_init(hca, port, name, dev);
2238 	if (rc) {
2239 		free_netdev(dev);
2240 		return ERR_PTR(rc);
2241 	}
2242 
2243 	/*
2244 	 * Upon success the caller must ensure ipoib_intf_free is called or
2245 	 * register_netdevice succeed'd and priv_destructor is set to
2246 	 * ipoib_intf_free.
2247 	 */
2248 	return dev;
2249 }
2250 
2251 void ipoib_intf_free(struct net_device *dev)
2252 {
2253 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
2254 	struct rdma_netdev *rn = netdev_priv(dev);
2255 
2256 	dev->priv_destructor = priv->next_priv_destructor;
2257 	if (dev->priv_destructor)
2258 		dev->priv_destructor(dev);
2259 
2260 	/*
2261 	 * There are some error flows around register_netdev failing that may
2262 	 * attempt to call priv_destructor twice, prevent that from happening.
2263 	 */
2264 	dev->priv_destructor = NULL;
2265 
2266 	/* unregister/destroy is very complicated. Make bugs more obvious. */
2267 	rn->clnt_priv = NULL;
2268 
2269 	kfree(priv);
2270 }
2271 
2272 static ssize_t pkey_show(struct device *dev, struct device_attribute *attr,
2273 			 char *buf)
2274 {
2275 	struct net_device *ndev = to_net_dev(dev);
2276 	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2277 
2278 	return sysfs_emit(buf, "0x%04x\n", priv->pkey);
2279 }
2280 static DEVICE_ATTR_RO(pkey);
2281 
2282 static ssize_t umcast_show(struct device *dev, struct device_attribute *attr,
2283 			   char *buf)
2284 {
2285 	struct net_device *ndev = to_net_dev(dev);
2286 	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2287 
2288 	return sysfs_emit(buf, "%d\n",
2289 			  test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2290 }
2291 
2292 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2293 {
2294 	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2295 
2296 	if (umcast_val > 0) {
2297 		set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2298 		ipoib_warn(priv, "ignoring multicast groups joined directly "
2299 				"by userspace\n");
2300 	} else
2301 		clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2302 }
2303 
2304 static ssize_t umcast_store(struct device *dev, struct device_attribute *attr,
2305 			    const char *buf, size_t count)
2306 {
2307 	unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2308 
2309 	ipoib_set_umcast(to_net_dev(dev), umcast_val);
2310 
2311 	return count;
2312 }
2313 static DEVICE_ATTR_RW(umcast);
2314 
2315 int ipoib_add_umcast_attr(struct net_device *dev)
2316 {
2317 	return device_create_file(&dev->dev, &dev_attr_umcast);
2318 }
2319 
2320 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2321 {
2322 	struct ipoib_dev_priv *child_priv;
2323 	struct net_device *netdev = priv->dev;
2324 
2325 	netif_addr_lock_bh(netdev);
2326 
2327 	memcpy(&priv->local_gid.global.interface_id,
2328 	       &gid->global.interface_id,
2329 	       sizeof(gid->global.interface_id));
2330 	memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
2331 	clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2332 
2333 	netif_addr_unlock_bh(netdev);
2334 
2335 	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2336 		down_read(&priv->vlan_rwsem);
2337 		list_for_each_entry(child_priv, &priv->child_intfs, list)
2338 			set_base_guid(child_priv, gid);
2339 		up_read(&priv->vlan_rwsem);
2340 	}
2341 }
2342 
2343 static int ipoib_check_lladdr(struct net_device *dev,
2344 			      struct sockaddr_storage *ss)
2345 {
2346 	union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2347 	int ret = 0;
2348 
2349 	netif_addr_lock_bh(dev);
2350 
2351 	/* Make sure the QPN, reserved and subnet prefix match the current
2352 	 * lladdr, it also makes sure the lladdr is unicast.
2353 	 */
2354 	if (memcmp(dev->dev_addr, ss->__data,
2355 		   4 + sizeof(gid->global.subnet_prefix)) ||
2356 	    gid->global.interface_id == 0)
2357 		ret = -EINVAL;
2358 
2359 	netif_addr_unlock_bh(dev);
2360 
2361 	return ret;
2362 }
2363 
2364 static int ipoib_set_mac(struct net_device *dev, void *addr)
2365 {
2366 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
2367 	struct sockaddr_storage *ss = addr;
2368 	int ret;
2369 
2370 	if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2371 		return -EBUSY;
2372 
2373 	ret = ipoib_check_lladdr(dev, ss);
2374 	if (ret)
2375 		return ret;
2376 
2377 	set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2378 
2379 	queue_work(ipoib_workqueue, &priv->flush_light);
2380 
2381 	return 0;
2382 }
2383 
2384 static ssize_t create_child_store(struct device *dev,
2385 				  struct device_attribute *attr,
2386 				  const char *buf, size_t count)
2387 {
2388 	int pkey;
2389 	int ret;
2390 
2391 	if (sscanf(buf, "%i", &pkey) != 1)
2392 		return -EINVAL;
2393 
2394 	if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2395 		return -EINVAL;
2396 
2397 	ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2398 
2399 	return ret ? ret : count;
2400 }
2401 static DEVICE_ATTR_WO(create_child);
2402 
2403 static ssize_t delete_child_store(struct device *dev,
2404 				  struct device_attribute *attr,
2405 				  const char *buf, size_t count)
2406 {
2407 	int pkey;
2408 	int ret;
2409 
2410 	if (sscanf(buf, "%i", &pkey) != 1)
2411 		return -EINVAL;
2412 
2413 	if (pkey < 0 || pkey > 0xffff)
2414 		return -EINVAL;
2415 
2416 	ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2417 
2418 	return ret ? ret : count;
2419 
2420 }
2421 static DEVICE_ATTR_WO(delete_child);
2422 
2423 int ipoib_add_pkey_attr(struct net_device *dev)
2424 {
2425 	return device_create_file(&dev->dev, &dev_attr_pkey);
2426 }
2427 
2428 /*
2429  * We erroneously exposed the iface's port number in the dev_id
2430  * sysfs field long after dev_port was introduced for that purpose[1],
2431  * and we need to stop everyone from relying on that.
2432  * Let's overload the shower routine for the dev_id file here
2433  * to gently bring the issue up.
2434  *
2435  * [1] https://www.spinics.net/lists/netdev/msg272123.html
2436  */
2437 static ssize_t dev_id_show(struct device *dev,
2438 			   struct device_attribute *attr, char *buf)
2439 {
2440 	struct net_device *ndev = to_net_dev(dev);
2441 
2442 	/*
2443 	 * ndev->dev_port will be equal to 0 in old kernel prior to commit
2444 	 * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
2445 	 * port numbers") Zero was chosen as special case for user space
2446 	 * applications to fallback and query dev_id to check if it has
2447 	 * different value or not.
2448 	 *
2449 	 * Don't print warning in such scenario.
2450 	 *
2451 	 * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
2452 	 */
2453 	if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
2454 		netdev_info_once(ndev,
2455 			"\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n",
2456 			current->comm);
2457 
2458 	return sysfs_emit(buf, "%#x\n", ndev->dev_id);
2459 }
2460 static DEVICE_ATTR_RO(dev_id);
2461 
2462 static int ipoib_intercept_dev_id_attr(struct net_device *dev)
2463 {
2464 	device_remove_file(&dev->dev, &dev_attr_dev_id);
2465 	return device_create_file(&dev->dev, &dev_attr_dev_id);
2466 }
2467 
2468 static struct net_device *ipoib_add_port(const char *format,
2469 					 struct ib_device *hca, u32 port)
2470 {
2471 	struct rtnl_link_ops *ops = ipoib_get_link_ops();
2472 	struct rdma_netdev_alloc_params params;
2473 	struct ipoib_dev_priv *priv;
2474 	struct net_device *ndev;
2475 	int result;
2476 
2477 	ndev = ipoib_intf_alloc(hca, port, format);
2478 	if (IS_ERR(ndev)) {
2479 		pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port,
2480 			PTR_ERR(ndev));
2481 		return ndev;
2482 	}
2483 	priv = ipoib_priv(ndev);
2484 
2485 	INIT_IB_EVENT_HANDLER(&priv->event_handler,
2486 			      priv->ca, ipoib_event);
2487 	ib_register_event_handler(&priv->event_handler);
2488 
2489 	/* call event handler to ensure pkey in sync */
2490 	queue_work(ipoib_workqueue, &priv->flush_heavy);
2491 
2492 	ndev->rtnl_link_ops = ipoib_get_link_ops();
2493 
2494 	result = register_netdev(ndev);
2495 	if (result) {
2496 		pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2497 			hca->name, port, result);
2498 
2499 		ipoib_parent_unregister_pre(ndev);
2500 		ipoib_intf_free(ndev);
2501 		free_netdev(ndev);
2502 
2503 		return ERR_PTR(result);
2504 	}
2505 
2506 	if (hca->ops.rdma_netdev_get_params) {
2507 		int rc = hca->ops.rdma_netdev_get_params(hca, port,
2508 						     RDMA_NETDEV_IPOIB,
2509 						     &params);
2510 
2511 		if (!rc && ops->priv_size < params.sizeof_priv)
2512 			ops->priv_size = params.sizeof_priv;
2513 	}
2514 	/*
2515 	 * We cannot set priv_destructor before register_netdev because we
2516 	 * need priv to be always valid during the error flow to execute
2517 	 * ipoib_parent_unregister_pre(). Instead handle it manually and only
2518 	 * enter priv_destructor mode once we are completely registered.
2519 	 */
2520 	ndev->priv_destructor = ipoib_intf_free;
2521 
2522 	if (ipoib_intercept_dev_id_attr(ndev))
2523 		goto sysfs_failed;
2524 	if (ipoib_cm_add_mode_attr(ndev))
2525 		goto sysfs_failed;
2526 	if (ipoib_add_pkey_attr(ndev))
2527 		goto sysfs_failed;
2528 	if (ipoib_add_umcast_attr(ndev))
2529 		goto sysfs_failed;
2530 	if (device_create_file(&ndev->dev, &dev_attr_create_child))
2531 		goto sysfs_failed;
2532 	if (device_create_file(&ndev->dev, &dev_attr_delete_child))
2533 		goto sysfs_failed;
2534 
2535 	return ndev;
2536 
2537 sysfs_failed:
2538 	ipoib_parent_unregister_pre(ndev);
2539 	unregister_netdev(ndev);
2540 	return ERR_PTR(-ENOMEM);
2541 }
2542 
2543 static int ipoib_add_one(struct ib_device *device)
2544 {
2545 	struct list_head *dev_list;
2546 	struct net_device *dev;
2547 	struct ipoib_dev_priv *priv;
2548 	unsigned int p;
2549 	int count = 0;
2550 
2551 	dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
2552 	if (!dev_list)
2553 		return -ENOMEM;
2554 
2555 	INIT_LIST_HEAD(dev_list);
2556 
2557 	rdma_for_each_port (device, p) {
2558 		if (!rdma_protocol_ib(device, p))
2559 			continue;
2560 		dev = ipoib_add_port("ib%d", device, p);
2561 		if (!IS_ERR(dev)) {
2562 			priv = ipoib_priv(dev);
2563 			list_add_tail(&priv->list, dev_list);
2564 			count++;
2565 		}
2566 	}
2567 
2568 	if (!count) {
2569 		kfree(dev_list);
2570 		return -EOPNOTSUPP;
2571 	}
2572 
2573 	ib_set_client_data(device, &ipoib_client, dev_list);
2574 	return 0;
2575 }
2576 
2577 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2578 {
2579 	struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2580 	struct list_head *dev_list = client_data;
2581 
2582 	list_for_each_entry_safe(priv, tmp, dev_list, list) {
2583 		LIST_HEAD(head);
2584 		ipoib_parent_unregister_pre(priv->dev);
2585 
2586 		rtnl_lock();
2587 
2588 		list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
2589 					 list)
2590 			unregister_netdevice_queue(cpriv->dev, &head);
2591 		unregister_netdevice_queue(priv->dev, &head);
2592 		unregister_netdevice_many(&head);
2593 
2594 		rtnl_unlock();
2595 	}
2596 
2597 	kfree(dev_list);
2598 }
2599 
2600 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2601 static struct notifier_block ipoib_netdev_notifier = {
2602 	.notifier_call = ipoib_netdev_event,
2603 };
2604 #endif
2605 
2606 static int __init ipoib_init_module(void)
2607 {
2608 	int ret;
2609 
2610 	ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2611 	ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2612 	ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2613 
2614 	ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2615 	ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2616 	ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2617 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2618 	ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2619 	ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2620 #endif
2621 
2622 	/*
2623 	 * When copying small received packets, we only copy from the
2624 	 * linear data part of the SKB, so we rely on this condition.
2625 	 */
2626 	BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2627 
2628 	ipoib_register_debugfs();
2629 
2630 	/*
2631 	 * We create a global workqueue here that is used for all flush
2632 	 * operations.  However, if you attempt to flush a workqueue
2633 	 * from a task on that same workqueue, it deadlocks the system.
2634 	 * We want to be able to flush the tasks associated with a
2635 	 * specific net device, so we also create a workqueue for each
2636 	 * netdevice.  We queue up the tasks for that device only on
2637 	 * its private workqueue, and we only queue up flush events
2638 	 * on our global flush workqueue.  This avoids the deadlocks.
2639 	 */
2640 	ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
2641 	if (!ipoib_workqueue) {
2642 		ret = -ENOMEM;
2643 		goto err_fs;
2644 	}
2645 
2646 	ib_sa_register_client(&ipoib_sa_client);
2647 
2648 	ret = ib_register_client(&ipoib_client);
2649 	if (ret)
2650 		goto err_sa;
2651 
2652 	ret = ipoib_netlink_init();
2653 	if (ret)
2654 		goto err_client;
2655 
2656 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2657 	register_netdevice_notifier(&ipoib_netdev_notifier);
2658 #endif
2659 	return 0;
2660 
2661 err_client:
2662 	ib_unregister_client(&ipoib_client);
2663 
2664 err_sa:
2665 	ib_sa_unregister_client(&ipoib_sa_client);
2666 	destroy_workqueue(ipoib_workqueue);
2667 
2668 err_fs:
2669 	ipoib_unregister_debugfs();
2670 
2671 	return ret;
2672 }
2673 
2674 static void __exit ipoib_cleanup_module(void)
2675 {
2676 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2677 	unregister_netdevice_notifier(&ipoib_netdev_notifier);
2678 #endif
2679 	ipoib_netlink_fini();
2680 	ib_unregister_client(&ipoib_client);
2681 	ib_sa_unregister_client(&ipoib_sa_client);
2682 	ipoib_unregister_debugfs();
2683 	destroy_workqueue(ipoib_workqueue);
2684 }
2685 
2686 module_init(ipoib_init_module);
2687 module_exit(ipoib_cleanup_module);
2688