IB: address translation to map IP toIB addresses (GIDs)
Sean Hefty [Sun, 18 Jun 2006 03:37:28 +0000 (20:37 -0700)]
Add an address translation service that maps IP addresses to
InfiniBand GID addresses using IPoIB.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/Kconfig
drivers/infiniband/core/Makefile
drivers/infiniband/core/addr.c [new file with mode: 0644]
include/rdma/ib_addr.h [new file with mode: 0644]

index afc612b..ba2d650 100644 (file)
@@ -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"
 
index a56bf9c..0509591 100644 (file)
@@ -1,5 +1,7 @@
+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
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
new file mode 100644 (file)
index 0000000..d294bbc
--- /dev/null
@@ -0,0 +1,367 @@
+/*
+ * 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);
diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h
new file mode 100644 (file)
index 0000000..fcb5ba8
--- /dev/null
@@ -0,0 +1,114 @@
+/*
+ * 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 */