[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 available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#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(struct work_struct *work);

static DEFINE_MUTEX(lock);
static LIST_HEAD(req_list);
static DECLARE_DELAYED_WORK(work, process_req);
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(&init_net, 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;
	__be32 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(&init_net, &rt, &fl))
		return;

	neigh_event_send(rt->u.dst.neighbour, 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)
{
	__be32 src_ip = src_in->sin_addr.s_addr;
	__be32 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(&init_net, &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(struct work_struct *work)
{
	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 == -ENODATA) {
			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_eq(jiffies, req->timeout))
				req->status = -ETIMEDOUT;
			else if (req->status == -ENODATA)
				continue;
		}
		list_move_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;
	__be32 src_ip = src_in->sin_addr.s_addr;
	__be32 dst_ip = dst_in->sin_addr.s_addr;
	int ret;

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

	if (ipv4_is_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 (ipv4_is_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 = kzalloc(sizeof *req, GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	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_move(&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->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");
	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	*
a9474917 SH	7	* This software is available to you under a choice of one of two
	8	* licenses. You may choose to be licensed under the terms of the GNU
	9	* General Public License (GPL) Version 2, available from the file
	10	* COPYING in the main directory of this source tree, or the
	11	* OpenIB.org BSD license below:
7025fcd3	12	*
a9474917 SH	13	* Redistribution and use in source and binary forms, with or
	14	* without modification, are permitted provided that the following
	15	* conditions are met:
7025fcd3	16	*
a9474917 SH	17	* - Redistributions of source code must retain the above
	18	* copyright notice, this list of conditions and the following
	19	* disclaimer.
7025fcd3	20	*
a9474917 SH	21	* - Redistributions in binary form must reproduce the above
	22	* copyright notice, this list of conditions and the following
	23	* disclaimer in the documentation and/or other materials
	24	* provided with the distribution.
7025fcd3	25	*
a9474917 SH	26	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	27	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	28	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	29	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	30	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	31	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	32	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	33	* SOFTWARE.
7025fcd3 SH	34	*/
	35
	36	#include <linux/mutex.h>
	37	#include <linux/inetdevice.h>
	38	#include <linux/workqueue.h>
	39	#include <linux/if_arp.h>
	40	#include <net/arp.h>
	41	#include <net/neighbour.h>
	42	#include <net/route.h>
e795d092	43	#include <net/netevent.h>
7025fcd3 SH	44	#include <rdma/ib_addr.h>
	45
	46	MODULE_AUTHOR("Sean Hefty");
	47	MODULE_DESCRIPTION("IB Address Translation");
	48	MODULE_LICENSE("Dual BSD/GPL");
	49
	50	struct addr_req {
	51	struct list_head list;
	52	struct sockaddr src_addr;
	53	struct sockaddr dst_addr;
	54	struct rdma_dev_addr *addr;
7a118df3	55	struct rdma_addr_client *client;
7025fcd3 SH	56	void *context;
	57	void (callback)(int status, struct sockaddr src_addr,
	58	struct rdma_dev_addr addr, void context);
	59	unsigned long timeout;
	60	int status;
	61	};
	62
c4028958	63	static void process_req(struct work_struct *work);
7025fcd3 SH	64
	65	static DEFINE_MUTEX(lock);
	66	static LIST_HEAD(req_list);
c4028958	67	static DECLARE_DELAYED_WORK(work, process_req);
7025fcd3 SH	68	static struct workqueue_struct *addr_wq;
7025fcd3 SH	69
7a118df3 SH	70	void rdma_addr_register_client(struct rdma_addr_client *client)
	71	{
	72	atomic_set(&client->refcount, 1);
	73	init_completion(&client->comp);
	74	}
	75	EXPORT_SYMBOL(rdma_addr_register_client);
	76
	77	static inline void put_client(struct rdma_addr_client *client)
	78	{
	79	if (atomic_dec_and_test(&client->refcount))
	80	complete(&client->comp);
	81	}
	82
	83	void rdma_addr_unregister_client(struct rdma_addr_client *client)
	84	{
	85	put_client(client);
	86	wait_for_completion(&client->comp);
	87	}
	88	EXPORT_SYMBOL(rdma_addr_unregister_client);
	89
07ebafba TT	90	int rdma_copy_addr(struct rdma_dev_addr dev_addr, struct net_device dev,
07ebafba TT	91	const unsigned char *dst_dev_addr)
7025fcd3 SH	92	{
	93	switch (dev->type) {
	94	case ARPHRD_INFINIBAND:
07ebafba TT	95	dev_addr->dev_type = RDMA_NODE_IB_CA;
	96	break;
	97	case ARPHRD_ETHER:
	98	dev_addr->dev_type = RDMA_NODE_RNIC;
7025fcd3 SH	99	break;
	100	default:
	101	return -EADDRNOTAVAIL;
	102	}
	103
	104	memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	105	memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
	106	if (dst_dev_addr)
	107	memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
	108	return 0;
	109	}
07ebafba	110	EXPORT_SYMBOL(rdma_copy_addr);
7025fcd3 SH	111
	112	int rdma_translate_ip(struct sockaddr addr, struct rdma_dev_addr dev_addr)
	113	{
	114	struct net_device *dev;
60cad5da	115	__be32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
7025fcd3 SH	116	int ret;
7025fcd3 SH	117
1ab35276	118	dev = ip_dev_find(&init_net, ip);
7025fcd3 SH	119	if (!dev)
	120	return -EADDRNOTAVAIL;
	121
07ebafba	122	ret = rdma_copy_addr(dev_addr, dev, NULL);
7025fcd3 SH	123	dev_put(dev);
	124	return ret;
	125	}
	126	EXPORT_SYMBOL(rdma_translate_ip);
	127
	128	static void set_timeout(unsigned long time)
	129	{
	130	unsigned long delay;
	131
	132	cancel_delayed_work(&work);
	133
	134	delay = time - jiffies;
	135	if ((long)delay <= 0)
	136	delay = 1;
	137
	138	queue_delayed_work(addr_wq, &work, delay);
	139	}
	140
	141	static void queue_req(struct addr_req *req)
	142	{
	143	struct addr_req *temp_req;
	144
	145	mutex_lock(&lock);
	146	list_for_each_entry_reverse(temp_req, &req_list, list) {
f115db48	147	if (time_after_eq(req->timeout, temp_req->timeout))
7025fcd3 SH	148	break;
	149	}
	150
	151	list_add(&req->list, &temp_req->list);
	152
	153	if (req_list.next == &req->list)
	154	set_timeout(req->timeout);
	155	mutex_unlock(&lock);
	156	}
	157
	158	static void addr_send_arp(struct sockaddr_in *dst_in)
	159	{
	160	struct rtable *rt;
	161	struct flowi fl;
1b90c137	162	__be32 dst_ip = dst_in->sin_addr.s_addr;
7025fcd3 SH	163
	164	memset(&fl, 0, sizeof fl);
	165	fl.nl_u.ip4_u.daddr = dst_ip;
f206351a	166	if (ip_route_output_key(&init_net, &rt, &fl))
7025fcd3 SH	167	return;
7025fcd3 SH	168
935ef2d7	169	neigh_event_send(rt->u.dst.neighbour, NULL);
7025fcd3 SH	170	ip_rt_put(rt);
	171	}
	172
	173	static int addr_resolve_remote(struct sockaddr_in *src_in,
	174	struct sockaddr_in *dst_in,
	175	struct rdma_dev_addr *addr)
	176	{
1b90c137 AV	177	__be32 src_ip = src_in->sin_addr.s_addr;
1b90c137 AV	178	__be32 dst_ip = dst_in->sin_addr.s_addr;
7025fcd3 SH	179	struct flowi fl;
	180	struct rtable *rt;
	181	struct neighbour *neigh;
	182	int ret;
	183
	184	memset(&fl, 0, sizeof fl);
	185	fl.nl_u.ip4_u.daddr = dst_ip;
	186	fl.nl_u.ip4_u.saddr = src_ip;
f206351a	187	ret = ip_route_output_key(&init_net, &rt, &fl);
7025fcd3 SH	188	if (ret)
	189	goto out;
	190
	191	/* If the device does ARP internally, return 'done' */
	192	if (rt->idev->dev->flags & IFF_NOARP) {
07ebafba	193	rdma_copy_addr(addr, rt->idev->dev, NULL);
7025fcd3 SH	194	goto put;
	195	}
	196
	197	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
	198	if (!neigh) {
	199	ret = -ENODATA;
	200	goto put;
	201	}
	202
	203	if (!(neigh->nud_state & NUD_VALID)) {
	204	ret = -ENODATA;
	205	goto release;
	206	}
	207
	208	if (!src_ip) {
	209	src_in->sin_family = dst_in->sin_family;
	210	src_in->sin_addr.s_addr = rt->rt_src;
	211	}
	212
07ebafba	213	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
7025fcd3 SH	214	release:
	215	neigh_release(neigh);
	216	put:
	217	ip_rt_put(rt);
	218	out:
	219	return ret;
	220	}
	221
c4028958	222	static void process_req(struct work_struct *work)
7025fcd3 SH	223	{
	224	struct addr_req req, temp_req;
	225	struct sockaddr_in src_in, dst_in;
	226	struct list_head done_list;
	227
	228	INIT_LIST_HEAD(&done_list);
	229
	230	mutex_lock(&lock);
	231	list_for_each_entry_safe(req, temp_req, &req_list, list) {
c78bb844	232	if (req->status == -ENODATA) {
7025fcd3 SH	233	src_in = (struct sockaddr_in *) &req->src_addr;
	234	dst_in = (struct sockaddr_in *) &req->dst_addr;
	235	req->status = addr_resolve_remote(src_in, dst_in,
	236	req->addr);
c78bb844 KK	237	if (req->status && time_after_eq(jiffies, req->timeout))
	238	req->status = -ETIMEDOUT;
	239	else if (req->status == -ENODATA)
	240	continue;
7025fcd3	241	}
04699a1f	242	list_move_tail(&req->list, &done_list);
7025fcd3 SH	243	}
	244
	245	if (!list_empty(&req_list)) {
	246	req = list_entry(req_list.next, struct addr_req, list);
	247	set_timeout(req->timeout);
	248	}
	249	mutex_unlock(&lock);
	250
	251	list_for_each_entry_safe(req, temp_req, &done_list, list) {
	252	list_del(&req->list);
	253	req->callback(req->status, &req->src_addr, req->addr,
	254	req->context);
7a118df3	255	put_client(req->client);
7025fcd3 SH	256	kfree(req);
	257	}
	258	}
	259
	260	static int addr_resolve_local(struct sockaddr_in *src_in,
	261	struct sockaddr_in *dst_in,
	262	struct rdma_dev_addr *addr)
	263	{
	264	struct net_device *dev;
1b90c137	265	__be32 src_ip = src_in->sin_addr.s_addr;
60cad5da	266	__be32 dst_ip = dst_in->sin_addr.s_addr;
7025fcd3 SH	267	int ret;
7025fcd3 SH	268
1ab35276	269	dev = ip_dev_find(&init_net, dst_ip);
7025fcd3 SH	270	if (!dev)
	271	return -EADDRNOTAVAIL;
	272
6360a02a	273	if (ipv4_is_zeronet(src_ip)) {
7025fcd3 SH	274	src_in->sin_family = dst_in->sin_family;
7025fcd3 SH	275	src_in->sin_addr.s_addr = dst_ip;
07ebafba	276	ret = rdma_copy_addr(addr, dev, dev->dev_addr);
6360a02a	277	} else if (ipv4_is_loopback(src_ip)) {
7025fcd3 SH	278	ret = rdma_translate_ip((struct sockaddr *)dst_in, addr);
	279	if (!ret)
	280	memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	281	} else {
	282	ret = rdma_translate_ip((struct sockaddr *)src_in, addr);
	283	if (!ret)
	284	memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	285	}
	286
	287	dev_put(dev);
	288	return ret;
	289	}
	290
7a118df3 SH	291	int rdma_resolve_ip(struct rdma_addr_client *client,
7a118df3 SH	292	struct sockaddr src_addr, struct sockaddr dst_addr,
7025fcd3 SH	293	struct rdma_dev_addr *addr, int timeout_ms,
	294	void (callback)(int status, struct sockaddr src_addr,
	295	struct rdma_dev_addr addr, void context),
	296	void *context)
	297	{
	298	struct sockaddr_in src_in, dst_in;
	299	struct addr_req *req;
	300	int ret = 0;
	301
dd00cc48	302	req = kzalloc(sizeof *req, GFP_KERNEL);
7025fcd3 SH	303	if (!req)
7025fcd3 SH	304	return -ENOMEM;
7025fcd3 SH	305
	306	if (src_addr)
	307	memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr));
	308	memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr));
	309	req->addr = addr;
	310	req->callback = callback;
	311	req->context = context;
7a118df3 SH	312	req->client = client;
7a118df3 SH	313	atomic_inc(&client->refcount);
7025fcd3 SH	314
	315	src_in = (struct sockaddr_in *) &req->src_addr;
	316	dst_in = (struct sockaddr_in *) &req->dst_addr;
	317
	318	req->status = addr_resolve_local(src_in, dst_in, addr);
	319	if (req->status == -EADDRNOTAVAIL)
	320	req->status = addr_resolve_remote(src_in, dst_in, addr);
	321
	322	switch (req->status) {
	323	case 0:
	324	req->timeout = jiffies;
	325	queue_req(req);
	326	break;
	327	case -ENODATA:
	328	req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
	329	queue_req(req);
	330	addr_send_arp(dst_in);
	331	break;
	332	default:
	333	ret = req->status;
7a118df3	334	atomic_dec(&client->refcount);
7025fcd3 SH	335	kfree(req);
	336	break;
	337	}
	338	return ret;
	339	}
	340	EXPORT_SYMBOL(rdma_resolve_ip);
	341
	342	void rdma_addr_cancel(struct rdma_dev_addr *addr)
	343	{
	344	struct addr_req req, temp_req;
	345
	346	mutex_lock(&lock);
	347	list_for_each_entry_safe(req, temp_req, &req_list, list) {
	348	if (req->addr == addr) {
	349	req->status = -ECANCELED;
	350	req->timeout = jiffies;
04699a1f	351	list_move(&req->list, &req_list);
7025fcd3 SH	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
1f126670	366	if (neigh->nud_state & NUD_VALID) {
e795d092 TT	367	set_timeout(jiffies);
	368	}
	369	}
7025fcd3 SH	370	return 0;
	371	}
	372
e795d092 TT	373	static struct notifier_block nb = {
e795d092 TT	374	.notifier_call = netevent_callback
7025fcd3 SH	375	};
	376
	377	static int addr_init(void)
	378	{
c7f743a6	379	addr_wq = create_singlethread_workqueue("ib_addr");
7025fcd3 SH	380	if (!addr_wq)
	381	return -ENOMEM;
	382
e795d092	383	register_netevent_notifier(&nb);
7025fcd3 SH	384	return 0;
	385	}
	386
	387	static void addr_cleanup(void)
	388	{
e795d092	389	unregister_netevent_notifier(&nb);
7025fcd3 SH	390	destroy_workqueue(addr_wq);
	391	}
	392
	393	module_init(addr_init);
	394	module_exit(addr_cleanup);