IB/core: Reserve bits in enum ib_qp_create_flags for low-level driver use

Reserve bits 26-31 for internal use by low-level drivers. Two such
bits are used in the mlx4_b driver SR-IOV implementation.

These enum additions guarantee that the core layer will never use
these bits, so that low level drivers may safely make use of them.
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <roland@purestorage.com>

include/rdma/ib_verbs.h

@@ -614,6 +614,9 @@ enum ib_qp_type {
 enum ib_qp_create_flags {
 	IB_QP_CREATE_IPOIB_UD_LSO		= 1 << 0,
 	IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK	= 1 << 1,
+	/* reserve bits 26-31 for low level drivers' internal use */
+	IB_QP_CREATE_RESERVED_START		= 1 << 26,
+	IB_QP_CREATE_RESERVED_END		= 1 << 31,
 };
 
 struct ib_qp_init_attr {