[net-next-2.6.git] / drivers / infiniband / core / addr.c

/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
 * Copyright (c) 2005 Intel Corporation.  All rights reserved.
 *
 * This Software is licensed under one of the following licenses:
 *
 * 1) under the terms of the "Common Public License 1.0" a copy of which is
 *    available from the Open Source Initiative, see
 *    http://www.opensource.org/licenses/cpl.php.
 *
 * 2) under the terms of the "The BSD License" a copy of which is
 *    available from the Open Source Initiative, see
 *    http://www.opensource.org/licenses/bsd-license.php.
 *
 * 3) under the terms of the "GNU General Public License (GPL) Version 2" a
 *    copy of which is available from the Open Source Initiative, see
 *    http://www.opensource.org/licenses/gpl-license.php.
 *
 * Licensee has the right to choose one of the above licenses.
 *
 * Redistributions of source code must retain the above copyright
 * notice and one of the license notices.
 *
 * Redistributions in binary form must reproduce both the above copyright
 * notice, one of the license notices in the documentation
 * and/or other materials provided with the distribution.
 */

#include <linux/mutex.h>
#include <linux/inetdevice.h>
#include <linux/workqueue.h>
#include <linux/if_arp.h>
#include <net/arp.h>
#include <net/neighbour.h>
#include <net/route.h>
#include <net/netevent.h>
#include <rdma/ib_addr.h>

MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("IB Address Translation");
MODULE_LICENSE("Dual BSD/GPL");

struct addr_req {
	struct list_head list;
	struct sockaddr src_addr;
	struct sockaddr dst_addr;
	struct rdma_dev_addr *addr;
	struct rdma_addr_client *client;
	void *context;
	void (*callback)(int status, struct sockaddr *src_addr,
			 struct rdma_dev_addr *addr, void *context);
	unsigned long timeout;
	int status;
};

static void process_req(void *data);

static DEFINE_MUTEX(lock);
static LIST_HEAD(req_list);
static DECLARE_WORK(work, process_req, NULL);
static struct workqueue_struct *addr_wq;

void rdma_addr_register_client(struct rdma_addr_client *client)
{
	atomic_set(&client->refcount, 1);
	init_completion(&client->comp);
}
EXPORT_SYMBOL(rdma_addr_register_client);

static inline void put_client(struct rdma_addr_client *client)
{
	if (atomic_dec_and_test(&client->refcount))
		complete(&client->comp);
}

void rdma_addr_unregister_client(struct rdma_addr_client *client)
{
	put_client(client);
	wait_for_completion(&client->comp);
}
EXPORT_SYMBOL(rdma_addr_unregister_client);

int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
		     const unsigned char *dst_dev_addr)
{
	switch (dev->type) {
	case ARPHRD_INFINIBAND:
		dev_addr->dev_type = RDMA_NODE_IB_CA;
		break;
	case ARPHRD_ETHER:
		dev_addr->dev_type = RDMA_NODE_RNIC;
		break;
	default:
		return -EADDRNOTAVAIL;
	}

	memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
	if (dst_dev_addr)
		memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
	return 0;
}
EXPORT_SYMBOL(rdma_copy_addr);

int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
	struct net_device *dev;
	__be32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
	int ret;

	dev = ip_dev_find(ip);
	if (!dev)
		return -EADDRNOTAVAIL;

	ret = rdma_copy_addr(dev_addr, dev, NULL);
	dev_put(dev);
	return ret;
}
EXPORT_SYMBOL(rdma_translate_ip);

static void set_timeout(unsigned long time)
{
	unsigned long delay;

	cancel_delayed_work(&work);

	delay = time - jiffies;
	if ((long)delay <= 0)
		delay = 1;

	queue_delayed_work(addr_wq, &work, delay);
}

static void queue_req(struct addr_req *req)
{
	struct addr_req *temp_req;

	mutex_lock(&lock);
	list_for_each_entry_reverse(temp_req, &req_list, list) {
		if (time_after_eq(req->timeout, temp_req->timeout))
			break;
	}

	list_add(&req->list, &temp_req->list);

	if (req_list.next == &req->list)
		set_timeout(req->timeout);
	mutex_unlock(&lock);
}

static void addr_send_arp(struct sockaddr_in *dst_in)
{
	struct rtable *rt;
	struct flowi fl;
	u32 dst_ip = dst_in->sin_addr.s_addr;

	memset(&fl, 0, sizeof fl);
	fl.nl_u.ip4_u.daddr = dst_ip;
	if (ip_route_output_key(&rt, &fl))
		return;

	arp_send(ARPOP_REQUEST, ETH_P_ARP, rt->rt_gateway, rt->idev->dev,
		 rt->rt_src, NULL, rt->idev->dev->dev_addr, NULL);
	ip_rt_put(rt);
}

static int addr_resolve_remote(struct sockaddr_in *src_in,
			       struct sockaddr_in *dst_in,
			       struct rdma_dev_addr *addr)
{
	u32 src_ip = src_in->sin_addr.s_addr;
	u32 dst_ip = dst_in->sin_addr.s_addr;
	struct flowi fl;
	struct rtable *rt;
	struct neighbour *neigh;
	int ret;

	memset(&fl, 0, sizeof fl);
	fl.nl_u.ip4_u.daddr = dst_ip;
	fl.nl_u.ip4_u.saddr = src_ip;
	ret = ip_route_output_key(&rt, &fl);
	if (ret)
		goto out;

	/* If the device does ARP internally, return 'done' */
	if (rt->idev->dev->flags & IFF_NOARP) {
		rdma_copy_addr(addr, rt->idev->dev, NULL);
		goto put;
	}

	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
	if (!neigh) {
		ret = -ENODATA;
		goto put;
	}

	if (!(neigh->nud_state & NUD_VALID)) {
		ret = -ENODATA;
		goto release;
	}

	if (!src_ip) {
		src_in->sin_family = dst_in->sin_family;
		src_in->sin_addr.s_addr = rt->rt_src;
	}

	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
release:
	neigh_release(neigh);
put:
	ip_rt_put(rt);
out:
	return ret;
}

static void process_req(void *data)
{
	struct addr_req *req, *temp_req;
	struct sockaddr_in *src_in, *dst_in;
	struct list_head done_list;

	INIT_LIST_HEAD(&done_list);

	mutex_lock(&lock);
	list_for_each_entry_safe(req, temp_req, &req_list, list) {
		if (req->status) {
			src_in = (struct sockaddr_in *) &req->src_addr;
			dst_in = (struct sockaddr_in *) &req->dst_addr;
			req->status = addr_resolve_remote(src_in, dst_in,
							  req->addr);
		}
		if (req->status && time_after(jiffies, req->timeout))
			req->status = -ETIMEDOUT;
		else if (req->status == -ENODATA)
			continue;

		list_del(&req->list);
		list_add_tail(&req->list, &done_list);
	}

	if (!list_empty(&req_list)) {
		req = list_entry(req_list.next, struct addr_req, list);
		set_timeout(req->timeout);
	}
	mutex_unlock(&lock);

	list_for_each_entry_safe(req, temp_req, &done_list, list) {
		list_del(&req->list);
		req->callback(req->status, &req->src_addr, req->addr,
			      req->context);
		put_client(req->client);
		kfree(req);
	}
}

static int addr_resolve_local(struct sockaddr_in *src_in,
			      struct sockaddr_in *dst_in,
			      struct rdma_dev_addr *addr)
{
	struct net_device *dev;
	u32 src_ip = src_in->sin_addr.s_addr;
	__be32 dst_ip = dst_in->sin_addr.s_addr;
	int ret;

	dev = ip_dev_find(dst_ip);
	if (!dev)
		return -EADDRNOTAVAIL;

	if (ZERONET(src_ip)) {
		src_in->sin_family = dst_in->sin_family;
		src_in->sin_addr.s_addr = dst_ip;
		ret = rdma_copy_addr(addr, dev, dev->dev_addr);
	} else if (LOOPBACK(src_ip)) {
		ret = rdma_translate_ip((struct sockaddr *)dst_in, addr);
		if (!ret)
			memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	} else {
		ret = rdma_translate_ip((struct sockaddr *)src_in, addr);
		if (!ret)
			memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	}

	dev_put(dev);
	return ret;
}

int rdma_resolve_ip(struct rdma_addr_client *client,
		    struct sockaddr *src_addr, struct sockaddr *dst_addr,
		    struct rdma_dev_addr *addr, int timeout_ms,
		    void (*callback)(int status, struct sockaddr *src_addr,
				     struct rdma_dev_addr *addr, void *context),
		    void *context)
{
	struct sockaddr_in *src_in, *dst_in;
	struct addr_req *req;
	int ret = 0;

	req = kmalloc(sizeof *req, GFP_KERNEL);
	if (!req)
		return -ENOMEM;
	memset(req, 0, sizeof *req);

	if (src_addr)
		memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr));
	memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr));
	req->addr = addr;
	req->callback = callback;
	req->context = context;
	req->client = client;
	atomic_inc(&client->refcount);

	src_in = (struct sockaddr_in *) &req->src_addr;
	dst_in = (struct sockaddr_in *) &req->dst_addr;

	req->status = addr_resolve_local(src_in, dst_in, addr);
	if (req->status == -EADDRNOTAVAIL)
		req->status = addr_resolve_remote(src_in, dst_in, addr);

	switch (req->status) {
	case 0:
		req->timeout = jiffies;
		queue_req(req);
		break;
	case -ENODATA:
		req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
		queue_req(req);
		addr_send_arp(dst_in);
		break;
	default:
		ret = req->status;
		atomic_dec(&client->refcount);
		kfree(req);
		break;
	}
	return ret;
}
EXPORT_SYMBOL(rdma_resolve_ip);

void rdma_addr_cancel(struct rdma_dev_addr *addr)
{
	struct addr_req *req, *temp_req;

	mutex_lock(&lock);
	list_for_each_entry_safe(req, temp_req, &req_list, list) {
		if (req->addr == addr) {
			req->status = -ECANCELED;
			req->timeout = jiffies;
			list_del(&req->list);
			list_add(&req->list, &req_list);
			set_timeout(req->timeout);
			break;
		}
	}
	mutex_unlock(&lock);
}
EXPORT_SYMBOL(rdma_addr_cancel);

static int netevent_callback(struct notifier_block *self, unsigned long event,
	void *ctx)
{
	if (event == NETEVENT_NEIGH_UPDATE) {
		struct neighbour *neigh = ctx;

		if (neigh->dev->type == ARPHRD_INFINIBAND &&
		    (neigh->nud_state & NUD_VALID)) {
			set_timeout(jiffies);
		}
	}
	return 0;
}

static struct notifier_block nb = {
	.notifier_call = netevent_callback
};

static int addr_init(void)
{
	addr_wq = create_singlethread_workqueue("ib_addr_wq");
	if (!addr_wq)
		return -ENOMEM;

	register_netevent_notifier(&nb);
	return 0;
}

static void addr_cleanup(void)
{
	unregister_netevent_notifier(&nb);
	destroy_workqueue(addr_wq);
}

module_init(addr_init);
module_exit(addr_cleanup);
Commit	Line	Data
7025fcd3 SH	1	/*
	2	* Copyright (c) 2005 Voltaire Inc. All rights reserved.
	3	* Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
	4	* Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
	5	* Copyright (c) 2005 Intel Corporation. All rights reserved.
	6	*
	7	* This Software is licensed under one of the following licenses:
	8	*
	9	* 1) under the terms of the "Common Public License 1.0" a copy of which is
	10	* available from the Open Source Initiative, see
	11	* http://www.opensource.org/licenses/cpl.php.
	12	*
	13	* 2) under the terms of the "The BSD License" a copy of which is
	14	* available from the Open Source Initiative, see
	15	* http://www.opensource.org/licenses/bsd-license.php.
	16	*
	17	* 3) under the terms of the "GNU General Public License (GPL) Version 2" a
	18	* copy of which is available from the Open Source Initiative, see
	19	* http://www.opensource.org/licenses/gpl-license.php.
	20	*
	21	* Licensee has the right to choose one of the above licenses.
	22	*
	23	* Redistributions of source code must retain the above copyright
	24	* notice and one of the license notices.
	25	*
	26	* Redistributions in binary form must reproduce both the above copyright
	27	* notice, one of the license notices in the documentation
	28	* and/or other materials provided with the distribution.
	29	*/
	30
	31	#include <linux/mutex.h>
	32	#include <linux/inetdevice.h>
	33	#include <linux/workqueue.h>
	34	#include <linux/if_arp.h>
	35	#include <net/arp.h>
	36	#include <net/neighbour.h>
	37	#include <net/route.h>
e795d092	38	#include <net/netevent.h>
7025fcd3 SH	39	#include <rdma/ib_addr.h>
	40
	41	MODULE_AUTHOR("Sean Hefty");
	42	MODULE_DESCRIPTION("IB Address Translation");
	43	MODULE_LICENSE("Dual BSD/GPL");
	44
	45	struct addr_req {
	46	struct list_head list;
	47	struct sockaddr src_addr;
	48	struct sockaddr dst_addr;
	49	struct rdma_dev_addr *addr;
7a118df3	50	struct rdma_addr_client *client;
7025fcd3 SH	51	void *context;
	52	void (callback)(int status, struct sockaddr src_addr,
	53	struct rdma_dev_addr addr, void context);
	54	unsigned long timeout;
	55	int status;
	56	};
	57
	58	static void process_req(void *data);
	59
	60	static DEFINE_MUTEX(lock);
	61	static LIST_HEAD(req_list);
	62	static DECLARE_WORK(work, process_req, NULL);
	63	static struct workqueue_struct *addr_wq;
	64
7a118df3 SH	65	void rdma_addr_register_client(struct rdma_addr_client *client)
	66	{
	67	atomic_set(&client->refcount, 1);
	68	init_completion(&client->comp);
	69	}
	70	EXPORT_SYMBOL(rdma_addr_register_client);
	71
	72	static inline void put_client(struct rdma_addr_client *client)
	73	{
	74	if (atomic_dec_and_test(&client->refcount))
	75	complete(&client->comp);
	76	}
	77
	78	void rdma_addr_unregister_client(struct rdma_addr_client *client)
	79	{
	80	put_client(client);
	81	wait_for_completion(&client->comp);
	82	}
	83	EXPORT_SYMBOL(rdma_addr_unregister_client);
	84
07ebafba TT	85	int rdma_copy_addr(struct rdma_dev_addr dev_addr, struct net_device dev,
07ebafba TT	86	const unsigned char *dst_dev_addr)
7025fcd3 SH	87	{
	88	switch (dev->type) {
	89	case ARPHRD_INFINIBAND:
07ebafba TT	90	dev_addr->dev_type = RDMA_NODE_IB_CA;
	91	break;
	92	case ARPHRD_ETHER:
	93	dev_addr->dev_type = RDMA_NODE_RNIC;
7025fcd3 SH	94	break;
	95	default:
	96	return -EADDRNOTAVAIL;
	97	}
	98
	99	memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	100	memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
	101	if (dst_dev_addr)
	102	memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
	103	return 0;
	104	}
07ebafba	105	EXPORT_SYMBOL(rdma_copy_addr);
7025fcd3 SH	106
	107	int rdma_translate_ip(struct sockaddr addr, struct rdma_dev_addr dev_addr)
	108	{
	109	struct net_device *dev;
60cad5da	110	__be32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
7025fcd3 SH	111	int ret;
	112
	113	dev = ip_dev_find(ip);
	114	if (!dev)
	115	return -EADDRNOTAVAIL;
	116
07ebafba	117	ret = rdma_copy_addr(dev_addr, dev, NULL);
7025fcd3 SH	118	dev_put(dev);
	119	return ret;
	120	}
	121	EXPORT_SYMBOL(rdma_translate_ip);
	122
	123	static void set_timeout(unsigned long time)
	124	{
	125	unsigned long delay;
	126
	127	cancel_delayed_work(&work);
	128
	129	delay = time - jiffies;
	130	if ((long)delay <= 0)
	131	delay = 1;
	132
	133	queue_delayed_work(addr_wq, &work, delay);
	134	}
	135
	136	static void queue_req(struct addr_req *req)
	137	{
	138	struct addr_req *temp_req;
	139
	140	mutex_lock(&lock);
	141	list_for_each_entry_reverse(temp_req, &req_list, list) {
f115db48	142	if (time_after_eq(req->timeout, temp_req->timeout))
7025fcd3 SH	143	break;
	144	}
	145
	146	list_add(&req->list, &temp_req->list);
	147
	148	if (req_list.next == &req->list)
	149	set_timeout(req->timeout);
	150	mutex_unlock(&lock);
	151	}
	152
	153	static void addr_send_arp(struct sockaddr_in *dst_in)
	154	{
	155	struct rtable *rt;
	156	struct flowi fl;
	157	u32 dst_ip = dst_in->sin_addr.s_addr;
	158
	159	memset(&fl, 0, sizeof fl);
	160	fl.nl_u.ip4_u.daddr = dst_ip;
	161	if (ip_route_output_key(&rt, &fl))
	162	return;
	163
	164	arp_send(ARPOP_REQUEST, ETH_P_ARP, rt->rt_gateway, rt->idev->dev,
	165	rt->rt_src, NULL, rt->idev->dev->dev_addr, NULL);
	166	ip_rt_put(rt);
	167	}
	168
	169	static int addr_resolve_remote(struct sockaddr_in *src_in,
	170	struct sockaddr_in *dst_in,
	171	struct rdma_dev_addr *addr)
	172	{
	173	u32 src_ip = src_in->sin_addr.s_addr;
	174	u32 dst_ip = dst_in->sin_addr.s_addr;
	175	struct flowi fl;
	176	struct rtable *rt;
	177	struct neighbour *neigh;
	178	int ret;
	179
	180	memset(&fl, 0, sizeof fl);
	181	fl.nl_u.ip4_u.daddr = dst_ip;
	182	fl.nl_u.ip4_u.saddr = src_ip;
	183	ret = ip_route_output_key(&rt, &fl);
	184	if (ret)
	185	goto out;
	186
	187	/* If the device does ARP internally, return 'done' */
	188	if (rt->idev->dev->flags & IFF_NOARP) {
07ebafba	189	rdma_copy_addr(addr, rt->idev->dev, NULL);
7025fcd3 SH	190	goto put;
	191	}
	192
	193	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
	194	if (!neigh) {
	195	ret = -ENODATA;
	196	goto put;
	197	}
	198
	199	if (!(neigh->nud_state & NUD_VALID)) {
	200	ret = -ENODATA;
	201	goto release;
	202	}
	203
	204	if (!src_ip) {
	205	src_in->sin_family = dst_in->sin_family;
	206	src_in->sin_addr.s_addr = rt->rt_src;
	207	}
	208
07ebafba	209	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
7025fcd3 SH	210	release:
	211	neigh_release(neigh);
	212	put:
	213	ip_rt_put(rt);
	214	out:
	215	return ret;
	216	}
	217
	218	static void process_req(void *data)
	219	{
	220	struct addr_req req, temp_req;
	221	struct sockaddr_in src_in, dst_in;
	222	struct list_head done_list;
	223
	224	INIT_LIST_HEAD(&done_list);
	225
	226	mutex_lock(&lock);
	227	list_for_each_entry_safe(req, temp_req, &req_list, list) {
	228	if (req->status) {
	229	src_in = (struct sockaddr_in *) &req->src_addr;
	230	dst_in = (struct sockaddr_in *) &req->dst_addr;
	231	req->status = addr_resolve_remote(src_in, dst_in,
	232	req->addr);
	233	}
	234	if (req->status && time_after(jiffies, req->timeout))
	235	req->status = -ETIMEDOUT;
	236	else if (req->status == -ENODATA)
	237	continue;
	238
	239	list_del(&req->list);
	240	list_add_tail(&req->list, &done_list);
	241	}
	242
	243	if (!list_empty(&req_list)) {
	244	req = list_entry(req_list.next, struct addr_req, list);
	245	set_timeout(req->timeout);
	246	}
	247	mutex_unlock(&lock);
	248
	249	list_for_each_entry_safe(req, temp_req, &done_list, list) {
	250	list_del(&req->list);
	251	req->callback(req->status, &req->src_addr, req->addr,
	252	req->context);
7a118df3	253	put_client(req->client);
7025fcd3 SH	254	kfree(req);
	255	}
	256	}
	257
	258	static int addr_resolve_local(struct sockaddr_in *src_in,
	259	struct sockaddr_in *dst_in,
	260	struct rdma_dev_addr *addr)
	261	{
	262	struct net_device *dev;
	263	u32 src_ip = src_in->sin_addr.s_addr;
60cad5da	264	__be32 dst_ip = dst_in->sin_addr.s_addr;
7025fcd3 SH	265	int ret;
	266
	267	dev = ip_dev_find(dst_ip);
	268	if (!dev)
	269	return -EADDRNOTAVAIL;
	270
	271	if (ZERONET(src_ip)) {
	272	src_in->sin_family = dst_in->sin_family;
	273	src_in->sin_addr.s_addr = dst_ip;
07ebafba	274	ret = rdma_copy_addr(addr, dev, dev->dev_addr);
7025fcd3 SH	275	} else if (LOOPBACK(src_ip)) {
	276	ret = rdma_translate_ip((struct sockaddr *)dst_in, addr);
	277	if (!ret)
	278	memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	279	} else {
	280	ret = rdma_translate_ip((struct sockaddr *)src_in, addr);
	281	if (!ret)
	282	memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	283	}
	284
	285	dev_put(dev);
	286	return ret;
	287	}
	288
7a118df3 SH	289	int rdma_resolve_ip(struct rdma_addr_client *client,
7a118df3 SH	290	struct sockaddr src_addr, struct sockaddr dst_addr,
7025fcd3 SH	291	struct rdma_dev_addr *addr, int timeout_ms,
	292	void (callback)(int status, struct sockaddr src_addr,
	293	struct rdma_dev_addr addr, void context),
	294	void *context)
	295	{
	296	struct sockaddr_in src_in, dst_in;
	297	struct addr_req *req;
	298	int ret = 0;
	299
	300	req = kmalloc(sizeof *req, GFP_KERNEL);
	301	if (!req)
	302	return -ENOMEM;
	303	memset(req, 0, sizeof *req);
	304
	305	if (src_addr)
	306	memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr));
	307	memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr));
	308	req->addr = addr;
	309	req->callback = callback;
	310	req->context = context;
7a118df3 SH	311	req->client = client;
7a118df3 SH	312	atomic_inc(&client->refcount);
7025fcd3 SH	313
	314	src_in = (struct sockaddr_in *) &req->src_addr;
	315	dst_in = (struct sockaddr_in *) &req->dst_addr;
	316
	317	req->status = addr_resolve_local(src_in, dst_in, addr);
	318	if (req->status == -EADDRNOTAVAIL)
	319	req->status = addr_resolve_remote(src_in, dst_in, addr);
	320
	321	switch (req->status) {
	322	case 0:
	323	req->timeout = jiffies;
	324	queue_req(req);
	325	break;
	326	case -ENODATA:
	327	req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
	328	queue_req(req);
	329	addr_send_arp(dst_in);
	330	break;
	331	default:
	332	ret = req->status;
7a118df3	333	atomic_dec(&client->refcount);
7025fcd3 SH	334	kfree(req);
	335	break;
	336	}
	337	return ret;
	338	}
	339	EXPORT_SYMBOL(rdma_resolve_ip);
	340
	341	void rdma_addr_cancel(struct rdma_dev_addr *addr)
	342	{
	343	struct addr_req req, temp_req;
	344
	345	mutex_lock(&lock);
	346	list_for_each_entry_safe(req, temp_req, &req_list, list) {
	347	if (req->addr == addr) {
	348	req->status = -ECANCELED;
	349	req->timeout = jiffies;
	350	list_del(&req->list);
	351	list_add(&req->list, &req_list);
	352	set_timeout(req->timeout);
	353	break;
	354	}
	355	}
	356	mutex_unlock(&lock);
	357	}
	358	EXPORT_SYMBOL(rdma_addr_cancel);
	359
3cd96564	360	static int netevent_callback(struct notifier_block *self, unsigned long event,
e795d092	361	void *ctx)
7025fcd3	362	{
3cd96564	363	if (event == NETEVENT_NEIGH_UPDATE) {
e795d092	364	struct neighbour *neigh = ctx;
7025fcd3	365
e795d092 TT	366	if (neigh->dev->type == ARPHRD_INFINIBAND &&
	367	(neigh->nud_state & NUD_VALID)) {
	368	set_timeout(jiffies);
	369	}
	370	}
7025fcd3 SH	371	return 0;
	372	}
	373
e795d092 TT	374	static struct notifier_block nb = {
e795d092 TT	375	.notifier_call = netevent_callback
7025fcd3 SH	376	};
	377
	378	static int addr_init(void)
	379	{
	380	addr_wq = create_singlethread_workqueue("ib_addr_wq");
	381	if (!addr_wq)
	382	return -ENOMEM;
	383
e795d092	384	register_netevent_notifier(&nb);
7025fcd3 SH	385	return 0;
	386	}
	387
	388	static void addr_cleanup(void)
	389	{
e795d092	390	unregister_netevent_notifier(&nb);
7025fcd3 SH	391	destroy_workqueue(addr_wq);
	392	}
	393
	394	module_init(addr_init);
	395	module_exit(addr_cleanup);