IB/core: Add rdma_cap_opa_ah to expose opa address handles

rdma_cap_opa_ah(..) enables core components to check if the
corresponding port supports OPA extended addressing.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Don Hiatt <don.hiatt@intel.com>
Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

include/rdma/ib_verbs.h

@@ -501,6 +501,7 @@ static inline struct rdma_hw_stats *rdma_alloc_hw_stats_struct(
 /* Address format                       0x000FF000 */
 #define RDMA_CORE_CAP_AF_IB             0x00001000
 #define RDMA_CORE_CAP_ETH_AH            0x00002000
+#define RDMA_CORE_CAP_OPA_AH            0x00004000
 
 /* Protocol                             0xFFF00000 */
 #define RDMA_CORE_CAP_PROT_IB           0x00100000
@@ -2604,6 +2605,21 @@ static inline bool rdma_cap_eth_ah(const struct ib_device *device, u8 port_num)
 	return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_ETH_AH;
 }
 
+/**
+ * rdma_cap_opa_ah - Check if the port of device supports
+ * OPA Address handles
+ * @device: Device to check
+ * @port_num: Port number to check
+ *
+ * Return: true if we are running on an OPA device which supports
+ * the extended OPA addressing.
+ */
+static inline bool rdma_cap_opa_ah(struct ib_device *device, u8 port_num)
+{
+	return (device->port_immutable[port_num].core_cap_flags &
+		RDMA_CORE_CAP_OPA_AH) == RDMA_CORE_CAP_OPA_AH;
+}
+
 /**
  * rdma_max_mad_size - Return the max MAD size required by this RDMA Port.
  *