Commit 7025fcd3 authored by Sean Hefty's avatar Sean Hefty Committed by Roland Dreier
Browse files

IB: address translation to map IP toIB addresses (GIDs)



Add an address translation service that maps IP addresses to
InfiniBand GID addresses using IPoIB.
Signed-off-by: default avatarSean Hefty <sean.hefty@intel.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent a1e8733e
......@@ -29,6 +29,11 @@ config INFINIBAND_USER_ACCESS
libibverbs, libibcm and a hardware driver library from
<http://www.openib.org>.
config INFINIBAND_ADDR_TRANS
bool
depends on INFINIBAND && INET
default y
source "drivers/infiniband/hw/mthca/Kconfig"
source "drivers/infiniband/hw/ipath/Kconfig"
......
addr_trans-$(CONFIG_INFINIBAND_ADDR_TRANS) := ib_addr.o
obj-$(CONFIG_INFINIBAND) += ib_core.o ib_mad.o ib_sa.o \
ib_cm.o
ib_cm.o $(addr_trans-y)
obj-$(CONFIG_INFINIBAND_USER_MAD) += ib_umad.o
obj-$(CONFIG_INFINIBAND_USER_ACCESS) += ib_uverbs.o ib_ucm.o
......@@ -12,6 +14,8 @@ ib_sa-y := sa_query.o
ib_cm-y := cm.o
ib_addr-y := addr.o
ib_umad-y := user_mad.o
ib_ucm-y := ucm.o
......
/*
* 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 <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;
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;
static int copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
unsigned char *dst_dev_addr)
{
switch (dev->type) {
case ARPHRD_INFINIBAND:
dev_addr->dev_type = IB_NODE_CA;
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;
}
int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
struct net_device *dev;
u32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
int ret;
dev = ip_dev_find(ip);
if (!dev)
return -EADDRNOTAVAIL;
ret = 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(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) {
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 = 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);
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;
u32 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 = 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 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;
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;
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 addr_arp_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pkt, struct net_device *orig_dev)
{
struct arphdr *arp_hdr;
arp_hdr = (struct arphdr *) skb->nh.raw;
if (arp_hdr->ar_op == htons(ARPOP_REQUEST) ||
arp_hdr->ar_op == htons(ARPOP_REPLY))
set_timeout(jiffies);
kfree_skb(skb);
return 0;
}
static struct packet_type addr_arp = {
.type = __constant_htons(ETH_P_ARP),
.func = addr_arp_recv,
.af_packet_priv = (void*) 1,
};
static int addr_init(void)
{
addr_wq = create_singlethread_workqueue("ib_addr_wq");
if (!addr_wq)
return -ENOMEM;
dev_add_pack(&addr_arp);
return 0;
}
static void addr_cleanup(void)
{
dev_remove_pack(&addr_arp);
destroy_workqueue(addr_wq);
}
module_init(addr_init);
module_exit(addr_cleanup);
/*
* Copyright (c) 2005 Voltaire 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.
*
*/
#if !defined(IB_ADDR_H)
#define IB_ADDR_H
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <rdma/ib_verbs.h>
struct rdma_dev_addr {
unsigned char src_dev_addr[MAX_ADDR_LEN];
unsigned char dst_dev_addr[MAX_ADDR_LEN];
unsigned char broadcast[MAX_ADDR_LEN];
enum ib_node_type dev_type;
};
/**
* rdma_translate_ip - Translate a local IP address to an RDMA hardware
* address.
*/
int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr);
/**
* rdma_resolve_ip - Resolve source and destination IP addresses to
* RDMA hardware addresses.
* @src_addr: An optional source address to use in the resolution. If a
* source address is not provided, a usable address will be returned via
* the callback.
* @dst_addr: The destination address to resolve.
* @addr: A reference to a data location that will receive the resolved
* addresses. The data location must remain valid until the callback has
* been invoked.
* @timeout_ms: Amount of time to wait for the address resolution to complete.
* @callback: Call invoked once address resolution has completed, timed out,
* or been canceled. A status of 0 indicates success.
* @context: User-specified context associated with the call.
*/
int rdma_resolve_ip(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);
void rdma_addr_cancel(struct rdma_dev_addr *addr);
static inline int ip_addr_size(struct sockaddr *addr)
{
return addr->sa_family == AF_INET6 ?
sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
}
static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
{
return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
}
static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
{
dev_addr->broadcast[8] = pkey >> 8;
dev_addr->broadcast[9] = (unsigned char) pkey;
}
static inline union ib_gid *ib_addr_get_sgid(struct rdma_dev_addr *dev_addr)
{
return (union ib_gid *) (dev_addr->src_dev_addr + 4);
}
static inline void ib_addr_set_sgid(struct rdma_dev_addr *dev_addr,
union ib_gid *gid)
{
memcpy(dev_addr->src_dev_addr + 4, gid, sizeof *gid);
}
static inline union ib_gid *ib_addr_get_dgid(struct rdma_dev_addr *dev_addr)
{
return (union ib_gid *) (dev_addr->dst_dev_addr + 4);
}
static inline void ib_addr_set_dgid(struct rdma_dev_addr *dev_addr,
union ib_gid *gid)
{
memcpy(dev_addr->dst_dev_addr + 4, gid, sizeof *gid);
}
#endif /* IB_ADDR_H */
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