[infiniband] Add support for identifying the underlying hardware device

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/block/srp.c

 
 /** SRP device socket interface descriptor */
 static struct interface_descriptor srpdev_socket_desc =
-	INTF_DESC ( struct srp_device, socket, srpdev_socket_op );
+	INTF_DESC_PASSTHRU ( struct srp_device, socket, srpdev_socket_op,
+			     scsi );
 
 /** SRP device SCSI interface operations */
 static struct interface_operation srpdev_scsi_op[] = {
 
 /** SRP device SCSI interface descriptor */
 static struct interface_descriptor srpdev_scsi_desc =
-	INTF_DESC ( struct srp_device, scsi, srpdev_scsi_op );
+	INTF_DESC_PASSTHRU ( struct srp_device, scsi, srpdev_scsi_op, socket  );
 
 /**
  * Open SRP device

src/net/infiniband/ib_cmrc.c

 	return ( cmrc->connected ? IB_MAX_PAYLOAD_SIZE : 0 );
 }
 
+/**
+ * Identify device underlying CMRC connection
+ *
+ * @v cmrc		CMRC connection
+ * @ret device		Underlying device
+ */
+static struct device *
+ib_cmrc_identify_device ( struct ib_cmrc_connection *cmrc ) {
+	return cmrc->ibdev->dev;
+}
+
 /** CMRC data transfer interface operations */
 static struct interface_operation ib_cmrc_xfer_operations[] = {
 	INTF_OP ( xfer_deliver, struct ib_cmrc_connection *,
 	INTF_OP ( xfer_window, struct ib_cmrc_connection *,
 		  ib_cmrc_xfer_window ),
 	INTF_OP ( intf_close, struct ib_cmrc_connection *, ib_cmrc_close ),
+	INTF_OP ( identify_device, struct ib_cmrc_connection *,
+		  ib_cmrc_identify_device ),
 };
 
 /** CMRC data transfer interface descriptor */