fsl/fman_port: support getting timestamp

This patch is to add fman_port_get_tstamp() interface
to get timestamp.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fman/fman_port.c

@@ -1731,6 +1731,18 @@ int fman_port_get_hash_result_offset(struct fman_port *port, u32 *offset)
 }
 EXPORT_SYMBOL(fman_port_get_hash_result_offset);
 
+int fman_port_get_tstamp(struct fman_port *port, const void *data, u64 *tstamp)
+{
+	if (port->buffer_offsets.time_stamp_offset == ILLEGAL_BASE)
+		return -EINVAL;
+
+	*tstamp = be64_to_cpu(*(__be64 *)(data +
+			port->buffer_offsets.time_stamp_offset));
+
+	return 0;
+}
+EXPORT_SYMBOL(fman_port_get_tstamp);
+
 static int fman_port_probe(struct platform_device *of_dev)
 {
 	struct fman_port *port;

drivers/net/ethernet/freescale/fman/fman_port.h

@@ -153,6 +153,8 @@ u32 fman_port_get_qman_channel_id(struct fman_port *port);
 
 int fman_port_get_hash_result_offset(struct fman_port *port, u32 *offset);
 
+int fman_port_get_tstamp(struct fman_port *port, const void *data, u64 *tstamp);
+
 struct fman_port *fman_port_bind(struct device *dev);
 
 #endif /* __FMAN_PORT_H */