igc_ptp_rx_pktstamp
ktime_t igc_ptp_rx_pktstamp(struct igc_adapter *adapter, __le32 *buf);
timestamp = igc_ptp_rx_pktstamp(adapter, tstamp->timer1);
timestamp = igc_ptp_rx_pktstamp(adapter, tstamp->timer0);
*timestamp = igc_ptp_rx_pktstamp(adapter, tstamp->timer0);