[ofa-general] [RFC PATCH 5/5] ib/iser: use the rdma-cm new RDMA_ALIGN_WITH_NETDEVICE ha mode

[Or Gerlitz]

enhance iser to request for notification on network stack changes which
makes its rdma connection unaligned with the link used by the stack
for the <src,dst> IPs used to establish the connection.

When RDMA_CM_EVENT_NETDEV_CHANGE arrives, just disconnect the connection, following
that the iscsid daemon would reconnect, and the new connection would be well aligned.

Signed-off-by: Or Gerlitz <ogerlitz at voltaire.com>

Index: linux-2.6.26-rc2/drivers/infiniband/ulp/iser/iser_verbs.c
===================================================================
--- linux-2.6.26-rc2.orig/drivers/infiniband/ulp/iser/iser_verbs.c	2008-05-15 15:10:21.000000000 +0300
+++ linux-2.6.26-rc2/drivers/infiniband/ulp/iser/iser_verbs.c	2008-05-15 15:31:49.000000000 +0300
@@ -476,6 +476,9 @@ static int iser_cma_handler(struct rdma_
 	case RDMA_CM_EVENT_DEVICE_REMOVAL:
 		iser_disconnected_handler(cma_id);
 		break;
+	case RDMA_CM_EVENT_NETDEV_CHANGE:
+		rdma_disconnect(cma_id);
+		break;
 	default:
 		iser_err("Unexpected RDMA CM event (%d)\n", event->event);
 		break;
@@ -534,7 +537,9 @@ int iser_connect(struct iser_conn   *ib_
 		iser_err("rdma_create_id failed: %d\n", err);
 		goto id_failure;
 	}
-
+
+	rdma_set_high_availability_mode(ib_conn->cma_id, RDMA_ALIGN_WITH_NETDEVICE);
+
 	src = (struct sockaddr *)src_addr;
 	dst = (struct sockaddr *)dst_addr;
 	err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000);