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.
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:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
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.
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
37 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.h>
42 #include <linux/vmalloc.h>
44 #include <linux/if_arp.h> /* For ARPHRD_xxx */
49 #include <linux/jhash.h>
52 MODULE_AUTHOR("Roland Dreier");
53 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
54 MODULE_LICENSE("Dual BSD/GPL");
56 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
57 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
59 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
60 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
61 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
62 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
64 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
65 int ipoib_debug_level;
67 module_param_named(debug_level, ipoib_debug_level, int, 0644);
68 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
71 struct ipoib_path_iter {
72 struct net_device *dev;
73 struct ipoib_path path;
76 static const u8 ipv4_bcast_addr[] = {
77 0x00, 0xff, 0xff, 0xff,
78 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
79 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
82 struct workqueue_struct *ipoib_workqueue;
84 struct ib_sa_client ipoib_sa_client;
86 static void ipoib_add_one(struct ib_device *device);
87 static void ipoib_remove_one(struct ib_device *device);
88 static void ipoib_neigh_reclaim(struct rcu_head *rp);
90 static struct ib_client ipoib_client = {
93 .remove = ipoib_remove_one
96 int ipoib_open(struct net_device *dev)
98 struct ipoib_dev_priv *priv = netdev_priv(dev);
100 ipoib_dbg(priv, "bringing up interface\n");
102 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
104 if (ipoib_pkey_dev_delay_open(dev))
107 if (ipoib_ib_dev_open(dev))
110 if (ipoib_ib_dev_up(dev))
113 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
114 struct ipoib_dev_priv *cpriv;
116 /* Bring up any child interfaces too */
117 mutex_lock(&priv->vlan_mutex);
118 list_for_each_entry(cpriv, &priv->child_intfs, list) {
121 flags = cpriv->dev->flags;
125 dev_change_flags(cpriv->dev, flags | IFF_UP);
127 mutex_unlock(&priv->vlan_mutex);
130 netif_start_queue(dev);
135 ipoib_ib_dev_stop(dev, 1);
138 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
143 static int ipoib_stop(struct net_device *dev)
145 struct ipoib_dev_priv *priv = netdev_priv(dev);
147 ipoib_dbg(priv, "stopping interface\n");
149 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
151 netif_stop_queue(dev);
153 ipoib_ib_dev_down(dev, 0);
154 ipoib_ib_dev_stop(dev, 0);
156 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
157 struct ipoib_dev_priv *cpriv;
159 /* Bring down any child interfaces too */
160 mutex_lock(&priv->vlan_mutex);
161 list_for_each_entry(cpriv, &priv->child_intfs, list) {
164 flags = cpriv->dev->flags;
165 if (!(flags & IFF_UP))
168 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
170 mutex_unlock(&priv->vlan_mutex);
176 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
178 struct ipoib_dev_priv *priv = netdev_priv(dev);
180 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
181 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
186 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
188 struct ipoib_dev_priv *priv = netdev_priv(dev);
190 /* dev->mtu > 2K ==> connected mode */
191 if (ipoib_cm_admin_enabled(dev)) {
192 if (new_mtu > ipoib_cm_max_mtu(dev))
195 if (new_mtu > priv->mcast_mtu)
196 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
203 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
206 priv->admin_mtu = new_mtu;
208 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
213 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
215 struct ipoib_dev_priv *priv = netdev_priv(dev);
216 struct rb_node *n = priv->path_tree.rb_node;
217 struct ipoib_path *path;
221 path = rb_entry(n, struct ipoib_path, rb_node);
223 ret = memcmp(gid, path->pathrec.dgid.raw,
224 sizeof (union ib_gid));
237 static int __path_add(struct net_device *dev, struct ipoib_path *path)
239 struct ipoib_dev_priv *priv = netdev_priv(dev);
240 struct rb_node **n = &priv->path_tree.rb_node;
241 struct rb_node *pn = NULL;
242 struct ipoib_path *tpath;
247 tpath = rb_entry(pn, struct ipoib_path, rb_node);
249 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
250 sizeof (union ib_gid));
259 rb_link_node(&path->rb_node, pn, n);
260 rb_insert_color(&path->rb_node, &priv->path_tree);
262 list_add_tail(&path->list, &priv->path_list);
267 static void path_free(struct net_device *dev, struct ipoib_path *path)
271 while ((skb = __skb_dequeue(&path->queue)))
272 dev_kfree_skb_irq(skb);
274 ipoib_dbg(netdev_priv(dev), "path_free\n");
276 /* remove all neigh connected to this path */
277 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
280 ipoib_put_ah(path->ah);
285 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
287 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
289 struct ipoib_path_iter *iter;
291 iter = kmalloc(sizeof *iter, GFP_KERNEL);
296 memset(iter->path.pathrec.dgid.raw, 0, 16);
298 if (ipoib_path_iter_next(iter)) {
306 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
308 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
310 struct ipoib_path *path;
313 spin_lock_irq(&priv->lock);
315 n = rb_first(&priv->path_tree);
318 path = rb_entry(n, struct ipoib_path, rb_node);
320 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
321 sizeof (union ib_gid)) < 0) {
330 spin_unlock_irq(&priv->lock);
335 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
336 struct ipoib_path *path)
341 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
343 void ipoib_mark_paths_invalid(struct net_device *dev)
345 struct ipoib_dev_priv *priv = netdev_priv(dev);
346 struct ipoib_path *path, *tp;
348 spin_lock_irq(&priv->lock);
350 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
351 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
352 be16_to_cpu(path->pathrec.dlid),
353 path->pathrec.dgid.raw);
357 spin_unlock_irq(&priv->lock);
360 void ipoib_flush_paths(struct net_device *dev)
362 struct ipoib_dev_priv *priv = netdev_priv(dev);
363 struct ipoib_path *path, *tp;
364 LIST_HEAD(remove_list);
367 netif_tx_lock_bh(dev);
368 spin_lock_irqsave(&priv->lock, flags);
370 list_splice_init(&priv->path_list, &remove_list);
372 list_for_each_entry(path, &remove_list, list)
373 rb_erase(&path->rb_node, &priv->path_tree);
375 list_for_each_entry_safe(path, tp, &remove_list, list) {
377 ib_sa_cancel_query(path->query_id, path->query);
378 spin_unlock_irqrestore(&priv->lock, flags);
379 netif_tx_unlock_bh(dev);
380 wait_for_completion(&path->done);
381 path_free(dev, path);
382 netif_tx_lock_bh(dev);
383 spin_lock_irqsave(&priv->lock, flags);
386 spin_unlock_irqrestore(&priv->lock, flags);
387 netif_tx_unlock_bh(dev);
390 static void path_rec_completion(int status,
391 struct ib_sa_path_rec *pathrec,
394 struct ipoib_path *path = path_ptr;
395 struct net_device *dev = path->dev;
396 struct ipoib_dev_priv *priv = netdev_priv(dev);
397 struct ipoib_ah *ah = NULL;
398 struct ipoib_ah *old_ah = NULL;
399 struct ipoib_neigh *neigh, *tn;
400 struct sk_buff_head skqueue;
405 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
406 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
408 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
409 status, path->pathrec.dgid.raw);
411 skb_queue_head_init(&skqueue);
414 struct ib_ah_attr av;
416 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
417 ah = ipoib_create_ah(dev, priv->pd, &av);
420 spin_lock_irqsave(&priv->lock, flags);
422 if (!IS_ERR_OR_NULL(ah)) {
423 path->pathrec = *pathrec;
428 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
429 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
431 while ((skb = __skb_dequeue(&path->queue)))
432 __skb_queue_tail(&skqueue, skb);
434 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
436 WARN_ON(neigh->ah != old_ah);
438 * Dropping the ah reference inside
439 * priv->lock is safe here, because we
440 * will hold one more reference from
441 * the original value of path->ah (ie
444 ipoib_put_ah(neigh->ah);
446 kref_get(&path->ah->ref);
447 neigh->ah = path->ah;
449 if (ipoib_cm_enabled(dev, neigh->daddr)) {
450 if (!ipoib_cm_get(neigh))
451 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
454 if (!ipoib_cm_get(neigh)) {
455 list_del(&neigh->list);
456 ipoib_neigh_free(neigh);
461 while ((skb = __skb_dequeue(&neigh->queue)))
462 __skb_queue_tail(&skqueue, skb);
468 complete(&path->done);
470 spin_unlock_irqrestore(&priv->lock, flags);
473 ipoib_put_ah(old_ah);
475 while ((skb = __skb_dequeue(&skqueue))) {
477 if (dev_queue_xmit(skb))
478 ipoib_warn(priv, "dev_queue_xmit failed "
479 "to requeue packet\n");
483 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
485 struct ipoib_dev_priv *priv = netdev_priv(dev);
486 struct ipoib_path *path;
488 if (!priv->broadcast)
491 path = kzalloc(sizeof *path, GFP_ATOMIC);
497 skb_queue_head_init(&path->queue);
499 INIT_LIST_HEAD(&path->neigh_list);
501 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
502 path->pathrec.sgid = priv->local_gid;
503 path->pathrec.pkey = cpu_to_be16(priv->pkey);
504 path->pathrec.numb_path = 1;
505 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
510 static int path_rec_start(struct net_device *dev,
511 struct ipoib_path *path)
513 struct ipoib_dev_priv *priv = netdev_priv(dev);
515 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
516 path->pathrec.dgid.raw);
518 init_completion(&path->done);
521 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
523 IB_SA_PATH_REC_DGID |
524 IB_SA_PATH_REC_SGID |
525 IB_SA_PATH_REC_NUMB_PATH |
526 IB_SA_PATH_REC_TRAFFIC_CLASS |
531 if (path->query_id < 0) {
532 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
534 complete(&path->done);
535 return path->query_id;
541 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
542 struct net_device *dev)
544 struct ipoib_dev_priv *priv = netdev_priv(dev);
545 struct ipoib_path *path;
546 struct ipoib_neigh *neigh;
549 spin_lock_irqsave(&priv->lock, flags);
550 neigh = ipoib_neigh_alloc(daddr, dev);
552 spin_unlock_irqrestore(&priv->lock, flags);
553 ++dev->stats.tx_dropped;
554 dev_kfree_skb_any(skb);
558 path = __path_find(dev, daddr + 4);
560 path = path_rec_create(dev, daddr + 4);
564 __path_add(dev, path);
567 list_add_tail(&neigh->list, &path->neigh_list);
570 kref_get(&path->ah->ref);
571 neigh->ah = path->ah;
573 if (ipoib_cm_enabled(dev, neigh->daddr)) {
574 if (!ipoib_cm_get(neigh))
575 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
576 if (!ipoib_cm_get(neigh)) {
577 list_del(&neigh->list);
578 ipoib_neigh_free(neigh);
581 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
582 __skb_queue_tail(&neigh->queue, skb);
584 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
585 skb_queue_len(&neigh->queue));
589 spin_unlock_irqrestore(&priv->lock, flags);
590 ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
591 ipoib_neigh_put(neigh);
597 if (!path->query && path_rec_start(dev, path))
600 __skb_queue_tail(&neigh->queue, skb);
603 spin_unlock_irqrestore(&priv->lock, flags);
604 ipoib_neigh_put(neigh);
608 list_del(&neigh->list);
611 ipoib_neigh_free(neigh);
613 ++dev->stats.tx_dropped;
614 dev_kfree_skb_any(skb);
616 spin_unlock_irqrestore(&priv->lock, flags);
617 ipoib_neigh_put(neigh);
620 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
623 struct ipoib_dev_priv *priv = netdev_priv(dev);
624 struct ipoib_path *path;
627 spin_lock_irqsave(&priv->lock, flags);
629 path = __path_find(dev, cb->hwaddr + 4);
630 if (!path || !path->valid) {
634 path = path_rec_create(dev, cb->hwaddr + 4);
638 __skb_queue_tail(&path->queue, skb);
640 if (!path->query && path_rec_start(dev, path)) {
641 spin_unlock_irqrestore(&priv->lock, flags);
643 path_free(dev, path);
646 __path_add(dev, path);
648 ++dev->stats.tx_dropped;
649 dev_kfree_skb_any(skb);
652 spin_unlock_irqrestore(&priv->lock, flags);
657 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
658 be16_to_cpu(path->pathrec.dlid));
660 spin_unlock_irqrestore(&priv->lock, flags);
661 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
663 } else if ((path->query || !path_rec_start(dev, path)) &&
664 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
665 __skb_queue_tail(&path->queue, skb);
667 ++dev->stats.tx_dropped;
668 dev_kfree_skb_any(skb);
671 spin_unlock_irqrestore(&priv->lock, flags);
674 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
676 struct ipoib_dev_priv *priv = netdev_priv(dev);
677 struct ipoib_neigh *neigh;
678 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
679 struct ipoib_header *header;
682 header = (struct ipoib_header *) skb->data;
684 if (unlikely(cb->hwaddr[4] == 0xff)) {
685 /* multicast, arrange "if" according to probability */
686 if ((header->proto != htons(ETH_P_IP)) &&
687 (header->proto != htons(ETH_P_IPV6)) &&
688 (header->proto != htons(ETH_P_ARP)) &&
689 (header->proto != htons(ETH_P_RARP))) {
690 /* ethertype not supported by IPoIB */
691 ++dev->stats.tx_dropped;
692 dev_kfree_skb_any(skb);
695 /* Add in the P_Key for multicast*/
696 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
697 cb->hwaddr[9] = priv->pkey & 0xff;
699 neigh = ipoib_neigh_get(dev, cb->hwaddr);
701 goto send_using_neigh;
702 ipoib_mcast_send(dev, cb->hwaddr, skb);
706 /* unicast, arrange "switch" according to probability */
707 switch (header->proto) {
708 case htons(ETH_P_IP):
709 case htons(ETH_P_IPV6):
710 neigh = ipoib_neigh_get(dev, cb->hwaddr);
711 if (unlikely(!neigh)) {
712 neigh_add_path(skb, cb->hwaddr, dev);
716 case htons(ETH_P_ARP):
717 case htons(ETH_P_RARP):
718 /* for unicast ARP and RARP should always perform path find */
719 unicast_arp_send(skb, dev, cb);
722 /* ethertype not supported by IPoIB */
723 ++dev->stats.tx_dropped;
724 dev_kfree_skb_any(skb);
729 /* note we now hold a ref to neigh */
730 if (ipoib_cm_get(neigh)) {
731 if (ipoib_cm_up(neigh)) {
732 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
735 } else if (neigh->ah) {
736 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
740 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
741 spin_lock_irqsave(&priv->lock, flags);
742 __skb_queue_tail(&neigh->queue, skb);
743 spin_unlock_irqrestore(&priv->lock, flags);
745 ++dev->stats.tx_dropped;
746 dev_kfree_skb_any(skb);
750 ipoib_neigh_put(neigh);
755 static void ipoib_timeout(struct net_device *dev)
757 struct ipoib_dev_priv *priv = netdev_priv(dev);
759 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
760 jiffies_to_msecs(jiffies - dev->trans_start));
761 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
762 netif_queue_stopped(dev),
763 priv->tx_head, priv->tx_tail);
764 /* XXX reset QP, etc. */
767 static int ipoib_hard_header(struct sk_buff *skb,
768 struct net_device *dev,
770 const void *daddr, const void *saddr, unsigned len)
772 struct ipoib_header *header;
773 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
775 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
777 header->proto = htons(type);
778 header->reserved = 0;
781 * we don't rely on dst_entry structure, always stuff the
782 * destination address into skb->cb so we can figure out where
783 * to send the packet later.
785 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
790 static void ipoib_set_mcast_list(struct net_device *dev)
792 struct ipoib_dev_priv *priv = netdev_priv(dev);
794 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
795 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
799 queue_work(ipoib_workqueue, &priv->restart_task);
802 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
805 * Use only the address parts that contributes to spreading
806 * The subnet prefix is not used as one can not connect to
807 * same remote port (GUID) using the same remote QPN via two
810 /* qpn octets[1:4) & port GUID octets[12:20) */
811 u32 *daddr_32 = (u32 *) daddr;
814 hv = jhash_3words(daddr_32[3], daddr_32[4], 0xFFFFFF & daddr_32[0], 0);
815 return hv & htbl->mask;
818 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
820 struct ipoib_dev_priv *priv = netdev_priv(dev);
821 struct ipoib_neigh_table *ntbl = &priv->ntbl;
822 struct ipoib_neigh_hash *htbl;
823 struct ipoib_neigh *neigh = NULL;
828 htbl = rcu_dereference_bh(ntbl->htbl);
833 hash_val = ipoib_addr_hash(htbl, daddr);
834 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
836 neigh = rcu_dereference_bh(neigh->hnext)) {
837 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
838 /* found, take one ref on behalf of the caller */
839 if (!atomic_inc_not_zero(&neigh->refcnt)) {
844 neigh->alive = jiffies;
850 rcu_read_unlock_bh();
854 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
856 struct ipoib_neigh_table *ntbl = &priv->ntbl;
857 struct ipoib_neigh_hash *htbl;
858 unsigned long neigh_obsolete;
863 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
866 spin_lock_irqsave(&priv->lock, flags);
868 htbl = rcu_dereference_protected(ntbl->htbl,
869 lockdep_is_held(&priv->lock));
874 /* neigh is obsolete if it was idle for two GC periods */
875 dt = 2 * arp_tbl.gc_interval;
876 neigh_obsolete = jiffies - dt;
877 /* handle possible race condition */
878 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
881 for (i = 0; i < htbl->size; i++) {
882 struct ipoib_neigh *neigh;
883 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
885 while ((neigh = rcu_dereference_protected(*np,
886 lockdep_is_held(&priv->lock))) != NULL) {
887 /* was the neigh idle for two GC periods */
888 if (time_after(neigh_obsolete, neigh->alive)) {
889 rcu_assign_pointer(*np,
890 rcu_dereference_protected(neigh->hnext,
891 lockdep_is_held(&priv->lock)));
892 /* remove from path/mc list */
893 list_del(&neigh->list);
894 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
903 spin_unlock_irqrestore(&priv->lock, flags);
906 static void ipoib_reap_neigh(struct work_struct *work)
908 struct ipoib_dev_priv *priv =
909 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
911 __ipoib_reap_neigh(priv);
913 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
914 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
915 arp_tbl.gc_interval);
919 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
920 struct net_device *dev)
922 struct ipoib_neigh *neigh;
924 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
929 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
930 skb_queue_head_init(&neigh->queue);
931 INIT_LIST_HEAD(&neigh->list);
932 ipoib_cm_set(neigh, NULL);
933 /* one ref on behalf of the caller */
934 atomic_set(&neigh->refcnt, 1);
939 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
940 struct net_device *dev)
942 struct ipoib_dev_priv *priv = netdev_priv(dev);
943 struct ipoib_neigh_table *ntbl = &priv->ntbl;
944 struct ipoib_neigh_hash *htbl;
945 struct ipoib_neigh *neigh;
948 htbl = rcu_dereference_protected(ntbl->htbl,
949 lockdep_is_held(&priv->lock));
955 /* need to add a new neigh, but maybe some other thread succeeded?
956 * recalc hash, maybe hash resize took place so we do a search
958 hash_val = ipoib_addr_hash(htbl, daddr);
959 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
960 lockdep_is_held(&priv->lock));
962 neigh = rcu_dereference_protected(neigh->hnext,
963 lockdep_is_held(&priv->lock))) {
964 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
965 /* found, take one ref on behalf of the caller */
966 if (!atomic_inc_not_zero(&neigh->refcnt)) {
971 neigh->alive = jiffies;
976 neigh = ipoib_neigh_ctor(daddr, dev);
980 /* one ref on behalf of the hash table */
981 atomic_inc(&neigh->refcnt);
982 neigh->alive = jiffies;
984 rcu_assign_pointer(neigh->hnext,
985 rcu_dereference_protected(htbl->buckets[hash_val],
986 lockdep_is_held(&priv->lock)));
987 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
988 atomic_inc(&ntbl->entries);
995 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
997 /* neigh reference count was dropprd to zero */
998 struct net_device *dev = neigh->dev;
999 struct ipoib_dev_priv *priv = netdev_priv(dev);
1000 struct sk_buff *skb;
1002 ipoib_put_ah(neigh->ah);
1003 while ((skb = __skb_dequeue(&neigh->queue))) {
1004 ++dev->stats.tx_dropped;
1005 dev_kfree_skb_any(skb);
1007 if (ipoib_cm_get(neigh))
1008 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1009 ipoib_dbg(netdev_priv(dev),
1010 "neigh free for %06x %pI6\n",
1011 IPOIB_QPN(neigh->daddr),
1014 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1015 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1016 complete(&priv->ntbl.flushed);
1020 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1022 /* Called as a result of removal from hash table */
1023 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1024 /* note TX context may hold another ref */
1025 ipoib_neigh_put(neigh);
1028 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1030 struct net_device *dev = neigh->dev;
1031 struct ipoib_dev_priv *priv = netdev_priv(dev);
1032 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1033 struct ipoib_neigh_hash *htbl;
1034 struct ipoib_neigh __rcu **np;
1035 struct ipoib_neigh *n;
1038 htbl = rcu_dereference_protected(ntbl->htbl,
1039 lockdep_is_held(&priv->lock));
1043 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1044 np = &htbl->buckets[hash_val];
1045 for (n = rcu_dereference_protected(*np,
1046 lockdep_is_held(&priv->lock));
1048 n = rcu_dereference_protected(*np,
1049 lockdep_is_held(&priv->lock))) {
1052 rcu_assign_pointer(*np,
1053 rcu_dereference_protected(neigh->hnext,
1054 lockdep_is_held(&priv->lock)));
1055 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1063 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1065 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1066 struct ipoib_neigh_hash *htbl;
1067 struct ipoib_neigh **buckets;
1070 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1072 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1075 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1076 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1077 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1083 htbl->mask = (size - 1);
1084 htbl->buckets = buckets;
1087 atomic_set(&ntbl->entries, 0);
1089 /* start garbage collection */
1090 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1091 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
1092 arp_tbl.gc_interval);
1097 static void neigh_hash_free_rcu(struct rcu_head *head)
1099 struct ipoib_neigh_hash *htbl = container_of(head,
1100 struct ipoib_neigh_hash,
1102 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1103 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1107 complete(&ntbl->deleted);
1110 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1112 struct ipoib_dev_priv *priv = netdev_priv(dev);
1113 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1114 struct ipoib_neigh_hash *htbl;
1115 unsigned long flags;
1118 /* remove all neigh connected to a given path or mcast */
1119 spin_lock_irqsave(&priv->lock, flags);
1121 htbl = rcu_dereference_protected(ntbl->htbl,
1122 lockdep_is_held(&priv->lock));
1127 for (i = 0; i < htbl->size; i++) {
1128 struct ipoib_neigh *neigh;
1129 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1131 while ((neigh = rcu_dereference_protected(*np,
1132 lockdep_is_held(&priv->lock))) != NULL) {
1133 /* delete neighs belong to this parent */
1134 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1135 rcu_assign_pointer(*np,
1136 rcu_dereference_protected(neigh->hnext,
1137 lockdep_is_held(&priv->lock)));
1138 /* remove from parent list */
1139 list_del(&neigh->list);
1140 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1148 spin_unlock_irqrestore(&priv->lock, flags);
1151 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1153 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1154 struct ipoib_neigh_hash *htbl;
1155 unsigned long flags;
1156 int i, wait_flushed = 0;
1158 init_completion(&priv->ntbl.flushed);
1160 spin_lock_irqsave(&priv->lock, flags);
1162 htbl = rcu_dereference_protected(ntbl->htbl,
1163 lockdep_is_held(&priv->lock));
1167 wait_flushed = atomic_read(&priv->ntbl.entries);
1171 for (i = 0; i < htbl->size; i++) {
1172 struct ipoib_neigh *neigh;
1173 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1175 while ((neigh = rcu_dereference_protected(*np,
1176 lockdep_is_held(&priv->lock))) != NULL) {
1177 rcu_assign_pointer(*np,
1178 rcu_dereference_protected(neigh->hnext,
1179 lockdep_is_held(&priv->lock)));
1180 /* remove from path/mc list */
1181 list_del(&neigh->list);
1182 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1187 rcu_assign_pointer(ntbl->htbl, NULL);
1188 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1191 spin_unlock_irqrestore(&priv->lock, flags);
1193 wait_for_completion(&priv->ntbl.flushed);
1196 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1198 struct ipoib_dev_priv *priv = netdev_priv(dev);
1201 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1202 init_completion(&priv->ntbl.deleted);
1203 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1205 /* Stop GC if called at init fail need to cancel work */
1206 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1208 cancel_delayed_work(&priv->neigh_reap_task);
1210 ipoib_flush_neighs(priv);
1212 wait_for_completion(&priv->ntbl.deleted);
1216 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1218 struct ipoib_dev_priv *priv = netdev_priv(dev);
1220 if (ipoib_neigh_hash_init(priv) < 0)
1222 /* Allocate RX/TX "rings" to hold queued skbs */
1223 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1225 if (!priv->rx_ring) {
1226 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1227 ca->name, ipoib_recvq_size);
1228 goto out_neigh_hash_cleanup;
1231 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1232 if (!priv->tx_ring) {
1233 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1234 ca->name, ipoib_sendq_size);
1235 goto out_rx_ring_cleanup;
1238 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1240 if (ipoib_ib_dev_init(dev, ca, port))
1241 goto out_tx_ring_cleanup;
1245 out_tx_ring_cleanup:
1246 vfree(priv->tx_ring);
1248 out_rx_ring_cleanup:
1249 kfree(priv->rx_ring);
1251 out_neigh_hash_cleanup:
1252 ipoib_neigh_hash_uninit(dev);
1257 void ipoib_dev_cleanup(struct net_device *dev)
1259 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1261 ipoib_delete_debug_files(dev);
1263 /* Delete any child interfaces first */
1264 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1265 /* Stop GC on child */
1266 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1267 cancel_delayed_work(&cpriv->neigh_reap_task);
1268 unregister_netdev(cpriv->dev);
1269 ipoib_dev_cleanup(cpriv->dev);
1270 free_netdev(cpriv->dev);
1273 ipoib_ib_dev_cleanup(dev);
1275 kfree(priv->rx_ring);
1276 vfree(priv->tx_ring);
1278 priv->rx_ring = NULL;
1279 priv->tx_ring = NULL;
1281 ipoib_neigh_hash_uninit(dev);
1284 static const struct header_ops ipoib_header_ops = {
1285 .create = ipoib_hard_header,
1288 static const struct net_device_ops ipoib_netdev_ops = {
1289 .ndo_open = ipoib_open,
1290 .ndo_stop = ipoib_stop,
1291 .ndo_change_mtu = ipoib_change_mtu,
1292 .ndo_fix_features = ipoib_fix_features,
1293 .ndo_start_xmit = ipoib_start_xmit,
1294 .ndo_tx_timeout = ipoib_timeout,
1295 .ndo_set_rx_mode = ipoib_set_mcast_list,
1298 static void ipoib_setup(struct net_device *dev)
1300 struct ipoib_dev_priv *priv = netdev_priv(dev);
1302 dev->netdev_ops = &ipoib_netdev_ops;
1303 dev->header_ops = &ipoib_header_ops;
1305 ipoib_set_ethtool_ops(dev);
1307 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1309 dev->watchdog_timeo = HZ;
1311 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1313 dev->hard_header_len = IPOIB_ENCAP_LEN;
1314 dev->addr_len = INFINIBAND_ALEN;
1315 dev->type = ARPHRD_INFINIBAND;
1316 dev->tx_queue_len = ipoib_sendq_size * 2;
1317 dev->features = (NETIF_F_VLAN_CHALLENGED |
1319 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1321 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1323 netif_carrier_off(dev);
1327 spin_lock_init(&priv->lock);
1329 mutex_init(&priv->vlan_mutex);
1331 INIT_LIST_HEAD(&priv->path_list);
1332 INIT_LIST_HEAD(&priv->child_intfs);
1333 INIT_LIST_HEAD(&priv->dead_ahs);
1334 INIT_LIST_HEAD(&priv->multicast_list);
1336 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1337 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1338 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1339 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1340 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1341 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1342 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1343 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1344 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1347 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1349 struct net_device *dev;
1351 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1356 return netdev_priv(dev);
1359 static ssize_t show_pkey(struct device *dev,
1360 struct device_attribute *attr, char *buf)
1362 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1364 return sprintf(buf, "0x%04x\n", priv->pkey);
1366 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1368 static ssize_t show_umcast(struct device *dev,
1369 struct device_attribute *attr, char *buf)
1371 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1373 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1376 static ssize_t set_umcast(struct device *dev,
1377 struct device_attribute *attr,
1378 const char *buf, size_t count)
1380 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1381 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1383 if (umcast_val > 0) {
1384 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1385 ipoib_warn(priv, "ignoring multicast groups joined directly "
1388 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1392 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1394 int ipoib_add_umcast_attr(struct net_device *dev)
1396 return device_create_file(&dev->dev, &dev_attr_umcast);
1399 static ssize_t create_child(struct device *dev,
1400 struct device_attribute *attr,
1401 const char *buf, size_t count)
1406 if (sscanf(buf, "%i", &pkey) != 1)
1409 if (pkey < 0 || pkey > 0xffff)
1413 * Set the full membership bit, so that we join the right
1414 * broadcast group, etc.
1418 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1420 return ret ? ret : count;
1422 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1424 static ssize_t delete_child(struct device *dev,
1425 struct device_attribute *attr,
1426 const char *buf, size_t count)
1431 if (sscanf(buf, "%i", &pkey) != 1)
1434 if (pkey < 0 || pkey > 0xffff)
1437 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1439 return ret ? ret : count;
1442 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1444 int ipoib_add_pkey_attr(struct net_device *dev)
1446 return device_create_file(&dev->dev, &dev_attr_pkey);
1449 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1451 struct ib_device_attr *device_attr;
1452 int result = -ENOMEM;
1454 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1456 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1457 hca->name, sizeof *device_attr);
1461 result = ib_query_device(hca, device_attr);
1463 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1468 priv->hca_caps = device_attr->device_cap_flags;
1472 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1473 priv->dev->hw_features = NETIF_F_SG |
1474 NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1476 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1477 priv->dev->hw_features |= NETIF_F_TSO;
1479 priv->dev->features |= priv->dev->hw_features;
1485 static struct net_device *ipoib_add_port(const char *format,
1486 struct ib_device *hca, u8 port)
1488 struct ipoib_dev_priv *priv;
1489 struct ib_port_attr attr;
1490 int result = -ENOMEM;
1492 priv = ipoib_intf_alloc(format);
1494 goto alloc_mem_failed;
1496 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1497 priv->dev->dev_id = port - 1;
1499 if (!ib_query_port(hca, port, &attr))
1500 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1502 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1504 goto device_init_failed;
1507 /* MTU will be reset when mcast join happens */
1508 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1509 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1511 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1513 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1515 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1516 hca->name, port, result);
1517 goto device_init_failed;
1520 if (ipoib_set_dev_features(priv, hca))
1521 goto device_init_failed;
1524 * Set the full membership bit, so that we join the right
1525 * broadcast group, etc.
1527 priv->pkey |= 0x8000;
1529 priv->dev->broadcast[8] = priv->pkey >> 8;
1530 priv->dev->broadcast[9] = priv->pkey & 0xff;
1532 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1534 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1535 hca->name, port, result);
1536 goto device_init_failed;
1538 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1540 result = ipoib_dev_init(priv->dev, hca, port);
1542 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1543 hca->name, port, result);
1544 goto device_init_failed;
1547 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1548 priv->ca, ipoib_event);
1549 result = ib_register_event_handler(&priv->event_handler);
1551 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1552 "port %d (ret = %d)\n",
1553 hca->name, port, result);
1557 result = register_netdev(priv->dev);
1559 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1560 hca->name, port, result);
1561 goto register_failed;
1564 ipoib_create_debug_files(priv->dev);
1566 if (ipoib_cm_add_mode_attr(priv->dev))
1568 if (ipoib_add_pkey_attr(priv->dev))
1570 if (ipoib_add_umcast_attr(priv->dev))
1572 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1574 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1580 ipoib_delete_debug_files(priv->dev);
1581 unregister_netdev(priv->dev);
1584 ib_unregister_event_handler(&priv->event_handler);
1585 /* Stop GC if started before flush */
1586 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1587 cancel_delayed_work(&priv->neigh_reap_task);
1588 flush_workqueue(ipoib_workqueue);
1591 ipoib_dev_cleanup(priv->dev);
1594 free_netdev(priv->dev);
1597 return ERR_PTR(result);
1600 static void ipoib_add_one(struct ib_device *device)
1602 struct list_head *dev_list;
1603 struct net_device *dev;
1604 struct ipoib_dev_priv *priv;
1607 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1610 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1614 INIT_LIST_HEAD(dev_list);
1616 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1621 e = device->phys_port_cnt;
1624 for (p = s; p <= e; ++p) {
1625 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1627 dev = ipoib_add_port("ib%d", device, p);
1629 priv = netdev_priv(dev);
1630 list_add_tail(&priv->list, dev_list);
1634 ib_set_client_data(device, &ipoib_client, dev_list);
1637 static void ipoib_remove_one(struct ib_device *device)
1639 struct ipoib_dev_priv *priv, *tmp;
1640 struct list_head *dev_list;
1642 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1645 dev_list = ib_get_client_data(device, &ipoib_client);
1647 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1648 ib_unregister_event_handler(&priv->event_handler);
1651 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1655 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1656 cancel_delayed_work(&priv->neigh_reap_task);
1657 flush_workqueue(ipoib_workqueue);
1659 unregister_netdev(priv->dev);
1660 ipoib_dev_cleanup(priv->dev);
1661 free_netdev(priv->dev);
1667 static int __init ipoib_init_module(void)
1671 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1672 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1673 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1675 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1676 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1677 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1678 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1679 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1683 * When copying small received packets, we only copy from the
1684 * linear data part of the SKB, so we rely on this condition.
1686 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1688 ret = ipoib_register_debugfs();
1693 * We create our own workqueue mainly because we want to be
1694 * able to flush it when devices are being removed. We can't
1695 * use schedule_work()/flush_scheduled_work() because both
1696 * unregister_netdev() and linkwatch_event take the rtnl lock,
1697 * so flush_scheduled_work() can deadlock during device
1700 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1701 if (!ipoib_workqueue) {
1706 ib_sa_register_client(&ipoib_sa_client);
1708 ret = ib_register_client(&ipoib_client);
1715 ib_sa_unregister_client(&ipoib_sa_client);
1716 destroy_workqueue(ipoib_workqueue);
1719 ipoib_unregister_debugfs();
1724 static void __exit ipoib_cleanup_module(void)
1726 ib_unregister_client(&ipoib_client);
1727 ib_sa_unregister_client(&ipoib_sa_client);
1728 ipoib_unregister_debugfs();
1729 destroy_workqueue(ipoib_workqueue);
1732 module_init(ipoib_init_module);
1733 module_exit(ipoib_cleanup_module);