1 files changed, 460 insertions, 0 deletions

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
new file mode 100644
index 00000000..6ef660c1
--- /dev/null
+++ b/drivers/infiniband/core/addr.c
@@ -0,0 +1,460 @@
+/*
+ * 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/slab.h>
+#include <linux/workqueue.h>
+#include <linux/module.h>
+#include <net/arp.h>
+#include <net/neighbour.h>
+#include <net/route.h>
+#include <net/netevent.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.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_storage src_addr;
+	struct sockaddr_storage 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)
+{
+	dev_addr->dev_type = dev->type;
+	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);
+	dev_addr->bound_dev_if = dev->ifindex;
+	return 0;
+}
+EXPORT_SYMBOL(rdma_copy_addr);
+
+int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
+{
+	struct net_device *dev;
+	int ret = -EADDRNOTAVAIL;
+
+	if (dev_addr->bound_dev_if) {
+		dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
+		if (!dev)
+			return -ENODEV;
+		ret = rdma_copy_addr(dev_addr, dev, NULL);
+		dev_put(dev);
+		return ret;
+	}
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		dev = ip_dev_find(&init_net,
+			((struct sockaddr_in *) addr)->sin_addr.s_addr);
+
+		if (!dev)
+			return ret;
+
+		ret = rdma_copy_addr(dev_addr, dev, NULL);
+		dev_put(dev);
+		break;
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	case AF_INET6:
+		rcu_read_lock();
+		for_each_netdev_rcu(&init_net, dev) {
+			if (ipv6_chk_addr(&init_net,
+					  &((struct sockaddr_in6 *) addr)->sin6_addr,
+					  dev, 1)) {
+				ret = rdma_copy_addr(dev_addr, dev, NULL);
+				break;
+			}
+		}
+		rcu_read_unlock();
+		break;
+#endif
+	}
+	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 int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr, void *daddr)
+{
+	struct neighbour *n;
+	int ret;
+
+	n = dst_neigh_lookup(dst, daddr);
+
+	rcu_read_lock();
+	if (!n || !(n->nud_state & NUD_VALID)) {
+		if (n)
+			neigh_event_send(n, NULL);
+		ret = -ENODATA;
+	} else {
+		ret = rdma_copy_addr(dev_addr, dst->dev, n->ha);
+	}
+	rcu_read_unlock();
+
+	if (n)
+		neigh_release(n);
+
+	return ret;
+}
+
+static int addr4_resolve(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 rtable *rt;
+	struct flowi4 fl4;
+	int ret;
+
+	memset(&fl4, 0, sizeof(fl4));
+	fl4.daddr = dst_ip;
+	fl4.saddr = src_ip;
+	fl4.flowi4_oif = addr->bound_dev_if;
+	rt = ip_route_output_key(&init_net, &fl4);
+	if (IS_ERR(rt)) {
+		ret = PTR_ERR(rt);
+		goto out;
+	}
+	src_in->sin_family = AF_INET;
+	src_in->sin_addr.s_addr = fl4.saddr;
+
+	if (rt->dst.dev->flags & IFF_LOOPBACK) {
+		ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
+		if (!ret)
+			memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
+		goto put;
+	}
+
+	/* If the device does ARP internally, return 'done' */
+	if (rt->dst.dev->flags & IFF_NOARP) {
+		ret = rdma_copy_addr(addr, rt->dst.dev, NULL);
+		goto put;
+	}
+
+	ret = dst_fetch_ha(&rt->dst, addr, &fl4.daddr);
+put:
+	ip_rt_put(rt);
+out:
+	return ret;
+}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static int addr6_resolve(struct sockaddr_in6 *src_in,
+			 struct sockaddr_in6 *dst_in,
+			 struct rdma_dev_addr *addr)
+{
+	struct flowi6 fl6;
+	struct dst_entry *dst;
+	int ret;
+
+	memset(&fl6, 0, sizeof fl6);
+	fl6.daddr = dst_in->sin6_addr;
+	fl6.saddr = src_in->sin6_addr;
+	fl6.flowi6_oif = addr->bound_dev_if;
+
+	dst = ip6_route_output(&init_net, NULL, &fl6);
+	if ((ret = dst->error))
+		goto put;
+
+	if (ipv6_addr_any(&fl6.saddr)) {
+		ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
+					 &fl6.daddr, 0, &fl6.saddr);
+		if (ret)
+			goto put;
+
+		src_in->sin6_family = AF_INET6;
+		src_in->sin6_addr = fl6.saddr;
+	}
+
+	if (dst->dev->flags & IFF_LOOPBACK) {
+		ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
+		if (!ret)
+			memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
+		goto put;
+	}
+
+	/* If the device does ARP internally, return 'done' */
+	if (dst->dev->flags & IFF_NOARP) {
+		ret = rdma_copy_addr(addr, dst->dev, NULL);
+		goto put;
+	}
+
+	ret = dst_fetch_ha(dst, addr, &fl6.daddr);
+put:
+	dst_release(dst);
+	return ret;
+}
+#else
+static int addr6_resolve(struct sockaddr_in6 *src_in,
+			 struct sockaddr_in6 *dst_in,
+			 struct rdma_dev_addr *addr)
+{
+	return -EADDRNOTAVAIL;
+}
+#endif
+
+static int addr_resolve(struct sockaddr *src_in,
+			struct sockaddr *dst_in,
+			struct rdma_dev_addr *addr)
+{
+	if (src_in->sa_family == AF_INET) {
+		return addr4_resolve((struct sockaddr_in *) src_in,
+			(struct sockaddr_in *) dst_in, addr);
+	} else
+		return addr6_resolve((struct sockaddr_in6 *) src_in,
+			(struct sockaddr_in6 *) dst_in, addr);
+}
+
+static void process_req(struct work_struct *work)
+{
+	struct addr_req *req, *temp_req;
+	struct sockaddr *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 *) &req->src_addr;
+			dst_in = (struct sockaddr *) &req->dst_addr;
+			req->status = addr_resolve(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, (struct sockaddr *) &req->src_addr,
+			req->addr, req->context);
+		put_client(req->client);
+		kfree(req);
+	}
+}
+
+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 *src_in, *dst_in;
+	struct addr_req *req;
+	int ret = 0;
+
+	req = kzalloc(sizeof *req, GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	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;
+		}
+
+		memcpy(src_in, src_addr, ip_addr_size(src_addr));
+	} else {
+		src_in->sa_family = dst_addr->sa_family;
+	}
+
+	memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
+	req->addr = addr;
+	req->callback = callback;
+	req->context = context;
+	req->client = client;
+	atomic_inc(&client->refcount);
+
+	req->status = addr_resolve(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);
+		break;
+	default:
+		ret = req->status;
+		atomic_dec(&client->refcount);
+		goto err;
+	}
+	return ret;
+err:
+	kfree(req);
+	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 __init addr_init(void)
+{
+	addr_wq = create_singlethread_workqueue("ib_addr");
+	if (!addr_wq)
+		return -ENOMEM;
+
+	register_netevent_notifier(&nb);
+	return 0;
+}
+
+static void __exit addr_cleanup(void)
+{
+	unregister_netevent_notifier(&nb);
+	destroy_workqueue(addr_wq);
+}
+
+module_init(addr_init);
+module_exit(addr_cleanup);