RDMA/cma: Pass QP type into rdma_create_id()

The RDMA CM currently infers the QP type from the port space selected
by the user.  In the future (eg with RDMA_PS_IB or XRC), there may not
be a 1-1 correspondence between port space and QP type.  For netlink
export of RDMA CM state, we want to export the QP type to userspace,
so it is cleaner to explicitly associate a QP type to an ID.

Modify rdma_create_id() to allow the user to specify the QP type, and
use it to make our selections of datagram versus connected mode.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/net/rds/iw_cm.c b/net/rds/iw_cm.c
index 3a60a15..c12db66 100644
--- a/net/rds/iw_cm.c
+++ b/net/rds/iw_cm.c
@@ -522,7 +522,7 @@
 	/* XXX I wonder what affect the port space has */
 	/* delegate cm event handler to rdma_transport */
 	ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
-				     RDMA_PS_TCP);
+				     RDMA_PS_TCP, IB_QPT_RC);
 	if (IS_ERR(ic->i_cm_id)) {
 		ret = PTR_ERR(ic->i_cm_id);
 		ic->i_cm_id = NULL;