IB/Verbs: Use management helper rdma_cap_ib_smi()

Introduce helper rdma_cap_ib_smi() to help us check if the port of an
IB device support Infiniband Subnet Management Interface.
Signed-off-by: Michael Wang <yun.wang@profitbricks.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Tested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/agent.c

@@ -156,7 +156,7 @@ int ib_agent_port_open(struct ib_device *device, int port_num)
 		goto error1;
 	}
 
-	if (rdma_protocol_ib(device, port_num)) {
+	if (rdma_cap_ib_smi(device, port_num)) {
 		/* Obtain send only MAD agent for SMI QP */
 		port_priv->agent[0] = ib_register_mad_agent(device, port_num,
 							    IB_QPT_SMI, NULL, 0,

drivers/infiniband/core/mad.c

@@ -2938,7 +2938,7 @@ static int ib_mad_port_open(struct ib_device *device,
 	init_mad_qp(port_priv, &port_priv->qp_info[1]);
 
 	cq_size = mad_sendq_size + mad_recvq_size;
-	has_smi = rdma_protocol_ib(device, port_num);
+	has_smi = rdma_cap_ib_smi(device, port_num);
 	if (has_smi)
 		cq_size *= 2;
 

include/rdma/ib_verbs.h

@@ -1789,6 +1789,21 @@ static inline bool rdma_cap_ib_mad(struct ib_device *device, u8 port_num)
 	return rdma_ib_or_iboe(device, port_num);
 }
 
+/**
+ * rdma_cap_ib_smi - Check if the port of device has the capability Infiniband
+ * Subnet Management Interface.
+ *
+ * @device: Device to be checked
+ * @port_num: Port number of the device
+ *
+ * Return false when port of the device don't support Infiniband
+ * Subnet Management Interface.
+ */
+static inline bool rdma_cap_ib_smi(struct ib_device *device, u8 port_num)
+{
+	return rdma_protocol_ib(device, port_num);
+}
+
 int ib_query_gid(struct ib_device *device,
 		 u8 port_num, int index, union ib_gid *gid);