* Forwards packets unchanged on the same port.
* Check that sent IEEE1588 PTP packets are timestamped by the hardware.
*/
-typedef void (*port_fwd_begin_t)(portid_t pi);
+typedef int (*port_fwd_begin_t)(portid_t pi);
typedef void (*port_fwd_end_t)(portid_t pi);
typedef void (*packet_fwd_t)(struct fwd_stream *fs);