addr.c 19.8 KB
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/*
 * 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.
 *
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 * 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:
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 *
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 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
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 *
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 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
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 *
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 *      - 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.
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 *
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 * 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.
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 */

#include <linux/mutex.h>
#include <linux/inetdevice.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/module.h>
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#include <net/arp.h>
#include <net/neighbour.h>
#include <net/route.h>
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#include <net/netevent.h>
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#include <net/addrconf.h>
#include <net/ip6_route.h>
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#include <rdma/ib_addr.h>
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#include <rdma/ib.h>
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#include <rdma/rdma_netlink.h>
#include <net/netlink.h>

#include "core_priv.h"
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struct addr_req {
	struct list_head list;
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	struct sockaddr_storage src_addr;
	struct sockaddr_storage dst_addr;
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	struct rdma_dev_addr *addr;
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	struct rdma_addr_client *client;
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	void *context;
	void (*callback)(int status, struct sockaddr *src_addr,
			 struct rdma_dev_addr *addr, void *context);
	unsigned long timeout;
	int status;
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	u32 seq;
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};

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static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);

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static void process_req(struct work_struct *work);
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static DEFINE_MUTEX(lock);
static LIST_HEAD(req_list);
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static DECLARE_DELAYED_WORK(work, process_req);
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static struct workqueue_struct *addr_wq;

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static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
	[LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
		.len = sizeof(struct rdma_nla_ls_gid)},
};

static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
{
	struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
	int ret;

	if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
		return false;

	ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
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			nlmsg_len(nlh), ib_nl_addr_policy, NULL);
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	if (ret)
		return false;

	return true;
}

static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
{
	const struct nlattr *head, *curr;
	union ib_gid gid;
	struct addr_req *req;
	int len, rem;
	int found = 0;

	head = (const struct nlattr *)nlmsg_data(nlh);
	len = nlmsg_len(nlh);

	nla_for_each_attr(curr, head, len, rem) {
		if (curr->nla_type == LS_NLA_TYPE_DGID)
			memcpy(&gid, nla_data(curr), nla_len(curr));
	}

	mutex_lock(&lock);
	list_for_each_entry(req, &req_list, list) {
		if (nlh->nlmsg_seq != req->seq)
			continue;
		/* We set the DGID part, the rest was set earlier */
		rdma_addr_set_dgid(req->addr, &gid);
		req->status = 0;
		found = 1;
		break;
	}
	mutex_unlock(&lock);

	if (!found)
		pr_info("Couldn't find request waiting for DGID: %pI6\n",
			&gid);
}

int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
			     struct netlink_callback *cb)
{
	const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;

	if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
	    !(NETLINK_CB(skb).sk) ||
	    !netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;

	if (ib_nl_is_good_ip_resp(nlh))
		ib_nl_process_good_ip_rsep(nlh);

	return skb->len;
}

static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
			     const void *daddr,
			     u32 seq, u16 family)
{
	struct sk_buff *skb = NULL;
	struct nlmsghdr *nlh;
	struct rdma_ls_ip_resolve_header *header;
	void *data;
	size_t size;
	int attrtype;
	int len;

	if (family == AF_INET) {
		size = sizeof(struct in_addr);
		attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
	} else {
		size = sizeof(struct in6_addr);
		attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
	}

	len = nla_total_size(sizeof(size));
	len += NLMSG_ALIGN(sizeof(*header));

	skb = nlmsg_new(len, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
			    RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
	if (!data) {
		nlmsg_free(skb);
		return -ENODATA;
	}

	/* Construct the family header first */
	header = (struct rdma_ls_ip_resolve_header *)
		skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
	header->ifindex = dev_addr->bound_dev_if;
	nla_put(skb, attrtype, size, daddr);

	/* Repair the nlmsg header length */
	nlmsg_end(skb, nlh);
	ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, GFP_KERNEL);

	/* Make the request retry, so when we get the response from userspace
	 * we will have something.
	 */
	return -ENODATA;
}

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int rdma_addr_size(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET:
		return sizeof(struct sockaddr_in);
	case AF_INET6:
		return sizeof(struct sockaddr_in6);
	case AF_IB:
		return sizeof(struct sockaddr_ib);
	default:
		return 0;
	}
}
EXPORT_SYMBOL(rdma_addr_size);

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static struct rdma_addr_client self;

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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);

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int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
		     const unsigned char *dst_dev_addr)
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{
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	dev_addr->dev_type = dev->type;
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	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);
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	dev_addr->bound_dev_if = dev->ifindex;
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	return 0;
}
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EXPORT_SYMBOL(rdma_copy_addr);
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int rdma_translate_ip(const struct sockaddr *addr,
		      struct rdma_dev_addr *dev_addr,
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		      u16 *vlan_id)
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{
	struct net_device *dev;
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	int ret = -EADDRNOTAVAIL;
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	if (dev_addr->bound_dev_if) {
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		dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
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		if (!dev)
			return -ENODEV;
		ret = rdma_copy_addr(dev_addr, dev, NULL);
		dev_put(dev);
		return ret;
	}

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	switch (addr->sa_family) {
	case AF_INET:
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		dev = ip_dev_find(dev_addr->net,
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			((const struct sockaddr_in *)addr)->sin_addr.s_addr);
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		if (!dev)
			return ret;
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		ret = rdma_copy_addr(dev_addr, dev, NULL);
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		if (vlan_id)
			*vlan_id = rdma_vlan_dev_vlan_id(dev);
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		dev_put(dev);
		break;
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#if IS_ENABLED(CONFIG_IPV6)
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	case AF_INET6:
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		rcu_read_lock();
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		for_each_netdev_rcu(dev_addr->net, dev) {
			if (ipv6_chk_addr(dev_addr->net,
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					  &((const struct sockaddr_in6 *)addr)->sin6_addr,
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					  dev, 1)) {
				ret = rdma_copy_addr(dev_addr, dev, NULL);
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				if (vlan_id)
					*vlan_id = rdma_vlan_dev_vlan_id(dev);
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				break;
			}
		}
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		rcu_read_unlock();
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		break;
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#endif
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	}
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	return ret;
}
EXPORT_SYMBOL(rdma_translate_ip);

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

	delay = time - jiffies;
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	if ((long)delay < 0)
		delay = 0;
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	mod_delayed_work(addr_wq, &work, delay);
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}

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) {
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		if (time_after_eq(req->timeout, temp_req->timeout))
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			break;
	}

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

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

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static int ib_nl_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
			  const void *daddr, u32 seq, u16 family)
{
	if (ibnl_chk_listeners(RDMA_NL_GROUP_LS))
		return -EADDRNOTAVAIL;

	/* We fill in what we can, the response will fill the rest */
	rdma_copy_addr(dev_addr, dst->dev, NULL);
	return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
}

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static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
			const void *daddr)
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{
	struct neighbour *n;
	int ret;

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	n = dst_neigh_lookup(dst, daddr);

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	rcu_read_lock();
	if (!n || !(n->nud_state & NUD_VALID)) {
		if (n)
			neigh_event_send(n, NULL);
		ret = -ENODATA;
	} else {
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		ret = rdma_copy_addr(dev_addr, dst->dev, n->ha);
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	}
	rcu_read_unlock();

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	if (n)
		neigh_release(n);

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	return ret;
}

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static bool has_gateway(struct dst_entry *dst, sa_family_t family)
{
	struct rtable *rt;
	struct rt6_info *rt6;

	if (family == AF_INET) {
		rt = container_of(dst, struct rtable, dst);
		return rt->rt_uses_gateway;
	}

	rt6 = container_of(dst, struct rt6_info, dst);
	return rt6->rt6i_flags & RTF_GATEWAY;
}

static int fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
		    const struct sockaddr *dst_in, u32 seq)
{
	const struct sockaddr_in *dst_in4 =
		(const struct sockaddr_in *)dst_in;
	const struct sockaddr_in6 *dst_in6 =
		(const struct sockaddr_in6 *)dst_in;
	const void *daddr = (dst_in->sa_family == AF_INET) ?
		(const void *)&dst_in4->sin_addr.s_addr :
		(const void *)&dst_in6->sin6_addr;
	sa_family_t family = dst_in->sa_family;

	/* Gateway + ARPHRD_INFINIBAND -> IB router */
	if (has_gateway(dst, family) && dst->dev->type == ARPHRD_INFINIBAND)
		return ib_nl_fetch_ha(dst, dev_addr, daddr, seq, family);
	else
		return dst_fetch_ha(dst, dev_addr, daddr);
}

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static int addr4_resolve(struct sockaddr_in *src_in,
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			 const struct sockaddr_in *dst_in,
			 struct rdma_dev_addr *addr,
			 struct rtable **prt)
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{
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	__be32 src_ip = src_in->sin_addr.s_addr;
	__be32 dst_ip = dst_in->sin_addr.s_addr;
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	struct rtable *rt;
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	struct flowi4 fl4;
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	int ret;

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	memset(&fl4, 0, sizeof(fl4));
	fl4.daddr = dst_ip;
	fl4.saddr = src_ip;
	fl4.flowi4_oif = addr->bound_dev_if;
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	rt = ip_route_output_key(addr->net, &fl4);
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	if (IS_ERR(rt)) {
		ret = PTR_ERR(rt);
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		goto out;
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	}
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	src_in->sin_family = AF_INET;
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	src_in->sin_addr.s_addr = fl4.saddr;
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	/* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
	 * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
	 * type accordingly.
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	 */
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	if (rt->rt_uses_gateway && rt->dst.dev->type != ARPHRD_INFINIBAND)
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		addr->network = RDMA_NETWORK_IPV4;

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	addr->hoplimit = ip4_dst_hoplimit(&rt->dst);

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	*prt = rt;
	return 0;
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out:
	return ret;
}

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#if IS_ENABLED(CONFIG_IPV6)
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static int addr6_resolve(struct sockaddr_in6 *src_in,
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			 const struct sockaddr_in6 *dst_in,
			 struct rdma_dev_addr *addr,
			 struct dst_entry **pdst)
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{
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	struct flowi6 fl6;
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	struct dst_entry *dst;
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	struct rt6_info *rt;
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	int ret;
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	memset(&fl6, 0, sizeof fl6);
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	fl6.daddr = dst_in->sin6_addr;
	fl6.saddr = src_in->sin6_addr;
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	fl6.flowi6_oif = addr->bound_dev_if;
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	ret = ipv6_stub->ipv6_dst_lookup(addr->net, NULL, &dst, &fl6);
	if (ret < 0)
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		goto put;

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	rt = (struct rt6_info *)dst;
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	if (ipv6_addr_any(&fl6.saddr)) {
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		ret = ipv6_dev_get_saddr(addr->net, ip6_dst_idev(dst)->dev,
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					 &fl6.daddr, 0, &fl6.saddr);
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		if (ret)
			goto put;
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		src_in->sin6_family = AF_INET6;
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		src_in->sin6_addr = fl6.saddr;
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	}

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	/* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
	 * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
	 * type accordingly.
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	 */
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	if (rt->rt6i_flags & RTF_GATEWAY &&
	    ip6_dst_idev(dst)->dev->type != ARPHRD_INFINIBAND)
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		addr->network = RDMA_NETWORK_IPV6;

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	addr->hoplimit = ip6_dst_hoplimit(dst);

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	*pdst = dst;
	return 0;
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put:
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	dst_release(dst);
	return ret;
}
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#else
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static int addr6_resolve(struct sockaddr_in6 *src_in,
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			 const struct sockaddr_in6 *dst_in,
			 struct rdma_dev_addr *addr,
			 struct dst_entry **pdst)
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{
	return -EADDRNOTAVAIL;
}
#endif
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static int addr_resolve_neigh(struct dst_entry *dst,
			      const struct sockaddr *dst_in,
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			      struct rdma_dev_addr *addr,
			      u32 seq)
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{
	if (dst->dev->flags & IFF_LOOPBACK) {
		int ret;

		ret = rdma_translate_ip(dst_in, addr, NULL);
		if (!ret)
			memcpy(addr->dst_dev_addr, addr->src_dev_addr,
			       MAX_ADDR_LEN);

		return ret;
	}

	/* If the device doesn't do ARP internally */
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	if (!(dst->dev->flags & IFF_NOARP))
		return fetch_ha(dst, addr, dst_in, seq);
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	return rdma_copy_addr(addr, dst->dev, NULL);
}

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static int addr_resolve(struct sockaddr *src_in,
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			const struct sockaddr *dst_in,
			struct rdma_dev_addr *addr,
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			bool resolve_neigh,
			u32 seq)
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{
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	struct net_device *ndev;
	struct dst_entry *dst;
	int ret;

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	if (src_in->sa_family == AF_INET) {
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		struct rtable *rt = NULL;
		const struct sockaddr_in *dst_in4 =
			(const struct sockaddr_in *)dst_in;

		ret = addr4_resolve((struct sockaddr_in *)src_in,
				    dst_in4, addr, &rt);
		if (ret)
			return ret;

		if (resolve_neigh)
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			ret = addr_resolve_neigh(&rt->dst, dst_in, addr, seq);
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		ndev = rt->dst.dev;
		dev_hold(ndev);

		ip_rt_put(rt);
	} else {
		const struct sockaddr_in6 *dst_in6 =
			(const struct sockaddr_in6 *)dst_in;

		ret = addr6_resolve((struct sockaddr_in6 *)src_in,
				    dst_in6, addr,
				    &dst);
		if (ret)
			return ret;

		if (resolve_neigh)
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			ret = addr_resolve_neigh(dst, dst_in, addr, seq);
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		ndev = dst->dev;
		dev_hold(ndev);

		dst_release(dst);
	}

	addr->bound_dev_if = ndev->ifindex;
	addr->net = dev_net(ndev);
	dev_put(ndev);

	return ret;
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}

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static void process_req(struct work_struct *work)
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{
	struct addr_req *req, *temp_req;
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	struct sockaddr *src_in, *dst_in;
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	struct list_head done_list;

	INIT_LIST_HEAD(&done_list);

	mutex_lock(&lock);
	list_for_each_entry_safe(req, temp_req, &req_list, list) {
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		if (req->status == -ENODATA) {
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			src_in = (struct sockaddr *) &req->src_addr;
			dst_in = (struct sockaddr *) &req->dst_addr;
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			req->status = addr_resolve(src_in, dst_in, req->addr,
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						   true, req->seq);
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			if (req->status && time_after_eq(jiffies, req->timeout))
				req->status = -ETIMEDOUT;
			else if (req->status == -ENODATA)
				continue;
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		}
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		list_move_tail(&req->list, &done_list);
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	}

	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);
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		req->callback(req->status, (struct sockaddr *) &req->src_addr,
			req->addr, req->context);
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		put_client(req->client);
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		kfree(req);
	}
}

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int rdma_resolve_ip(struct rdma_addr_client *client,
		    struct sockaddr *src_addr, struct sockaddr *dst_addr,
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		    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)
{
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	struct sockaddr *src_in, *dst_in;
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	struct addr_req *req;
	int ret = 0;

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

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

	if (src_addr) {
		if (src_addr->sa_family != dst_addr->sa_family) {
			ret = -EINVAL;
			goto err;
		}

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		memcpy(src_in, src_addr, rdma_addr_size(src_addr));
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	} else {
		src_in->sa_family = dst_addr->sa_family;
	}

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	memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
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	req->addr = addr;
	req->callback = callback;
	req->context = context;
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	req->client = client;
	atomic_inc(&client->refcount);
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	req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
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	req->status = addr_resolve(src_in, dst_in, addr, true, req->seq);
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	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);
		break;
	default:
		ret = req->status;
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		atomic_dec(&client->refcount);
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		goto err;
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	}
	return ret;
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err:
	kfree(req);
	return ret;
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}
EXPORT_SYMBOL(rdma_resolve_ip);

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int rdma_resolve_ip_route(struct sockaddr *src_addr,
			  const struct sockaddr *dst_addr,
			  struct rdma_dev_addr *addr)
{
	struct sockaddr_storage ssrc_addr = {};
	struct sockaddr *src_in = (struct sockaddr *)&ssrc_addr;

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	if (src_addr) {
		if (src_addr->sa_family != dst_addr->sa_family)
			return -EINVAL;
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		memcpy(src_in, src_addr, rdma_addr_size(src_addr));
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	} else {
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		src_in->sa_family = dst_addr->sa_family;
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	}
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	return addr_resolve(src_in, dst_addr, addr, false, 0);
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}
EXPORT_SYMBOL(rdma_resolve_ip_route);

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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;
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			list_move(&req->list, &req_list);
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			set_timeout(req->timeout);
			break;
		}
	}
	mutex_unlock(&lock);
}
EXPORT_SYMBOL(rdma_addr_cancel);

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struct resolve_cb_context {
	struct rdma_dev_addr *addr;
	struct completion comp;
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	int status;
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};

static void resolve_cb(int status, struct sockaddr *src_addr,
	     struct rdma_dev_addr *addr, void *context)
{
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	if (!status)
		memcpy(((struct resolve_cb_context *)context)->addr,
		       addr, sizeof(struct rdma_dev_addr));
	((struct resolve_cb_context *)context)->status = status;
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	complete(&((struct resolve_cb_context *)context)->comp);
}

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int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
				 const union ib_gid *dgid,
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				 u8 *dmac, u16 *vlan_id, int *if_index,
				 int *hoplimit)
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{
	int ret = 0;
	struct rdma_dev_addr dev_addr;
	struct resolve_cb_context ctx;
	struct net_device *dev;

	union {
		struct sockaddr     _sockaddr;
		struct sockaddr_in  _sockaddr_in;
		struct sockaddr_in6 _sockaddr_in6;
	} sgid_addr, dgid_addr;


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	rdma_gid2ip(&sgid_addr._sockaddr, sgid);
	rdma_gid2ip(&dgid_addr._sockaddr, dgid);
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	memset(&dev_addr, 0, sizeof(dev_addr));
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	if (if_index)
		dev_addr.bound_dev_if = *if_index;
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	dev_addr.net = &init_net;
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	ctx.addr = &dev_addr;
	init_completion(&ctx.comp);
	ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
			&dev_addr, 1000, resolve_cb, &ctx);
	if (ret)
		return ret;

	wait_for_completion(&ctx.comp);

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	ret = ctx.status;
	if (ret)
		return ret;

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	memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
	dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
	if (!dev)
		return -ENODEV;
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	if (if_index)
		*if_index = dev_addr.bound_dev_if;
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	if (vlan_id)
		*vlan_id = rdma_vlan_dev_vlan_id(dev);
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	if (hoplimit)
		*hoplimit = dev_addr.hoplimit;
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	dev_put(dev);
	return ret;
}
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EXPORT_SYMBOL(rdma_addr_find_l2_eth_by_grh);
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int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
{
	int ret = 0;
	struct rdma_dev_addr dev_addr;
	union {
		struct sockaddr     _sockaddr;
		struct sockaddr_in  _sockaddr_in;
		struct sockaddr_in6 _sockaddr_in6;
	} gid_addr;

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	rdma_gid2ip(&gid_addr._sockaddr, sgid);
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	memset(&dev_addr, 0, sizeof(dev_addr));
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	dev_addr.net = &init_net;
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	ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
	if (ret)
		return ret;

	memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN);
	return ret;
}
EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid);

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static int netevent_callback(struct notifier_block *self, unsigned long event,
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	void *ctx)
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{
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	if (event == NETEVENT_NEIGH_UPDATE) {
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		struct neighbour *neigh = ctx;
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		if (neigh->nud_state & NUD_VALID) {
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			set_timeout(jiffies);
		}
	}
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	return 0;
}

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

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int addr_init(void)
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{
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	addr_wq = alloc_workqueue("ib_addr", WQ_MEM_RECLAIM, 0);
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	if (!addr_wq)
		return -ENOMEM;

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	register_netevent_notifier(&nb);
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	rdma_addr_register_client(&self);
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	return 0;
}

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