RDMA/addr: Keep pointer to netdevice in struct rdma_dev_addr

Keep a pointer to the local (src) netdevice in struct rdma_dev_addr,
and copy it in as part of rdma_copy_addr().  Use rdma_translate_ip()
in cma_new_conn_id() to reduce some code duplication and also make
sure the src_dev member gets set.

In a high-availability configuration the netdevice pointer can be used
by the RDMA CM to align RDMA sessions to use the same links as the IP
stack does under fail-over and route change cases.

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 6 insertions, 3 deletions

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index e4eb8be3bb0c..09a2bec7fd32 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -105,6 +105,7 @@ int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
         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->src_dev = dev;
         return 0;
 }
 EXPORT_SYMBOL(rdma_copy_addr);
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 44d190f67810..5fb506a41776 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -1002,6 +1002,7 @@ static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
         union cma_ip_addr *src, *dst;
         __be16 port;
         u8 ip_ver;
+        int ret;
 
         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
                              &ip_ver, &port, &src, &dst))
@@ -1026,10 +1027,11 @@ static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
         if (rt->num_paths == 2)
                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
 
-        ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
         ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
-        ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
-        rt->addr.dev_addr.dev_type = RDMA_NODE_IB_CA;
+        ret = rdma_translate_ip(&id->route.addr.src_addr,
+                                &id->route.addr.dev_addr);
+        if (ret)
+                goto destroy_id;
 
         id_priv = container_of(id, struct rdma_id_private, id);
         id_priv->state = CMA_CONNECT;