IB/core: Define 'ib' and 'roce' rdma_ah_attr types

rdma_ah_attr can now be either ib or roce allowing
core components to use one type or the other and also
to define attributes unique to a specific type. struct
ib_ah is also initialized with the type when its first
created. This ensures that calls such as modify_ah
dont modify the type of the address handle attribute.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Don Hiatt <don.hiatt@intel.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -380,6 +380,7 @@ static int rxe_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
 	struct rxe_ah *ah = to_rah(ibah);
 
 	memset(attr, 0, sizeof(*attr));
+	attr->type = ibah->type;
 	rxe_av_to_attr(rxe, &ah->av, attr);
 	return 0;
 }