igb: fix adjusting PTP timestamps for Tx/Rx latency
Fix PHY delay compensation math in igb_ptp_tx_hwtstamp() and igb_ptp_rx_rgtstamp. Add PHY delay compensation in igb_ptp_rx_pktstamp(). In the IGB driver, there are two functions that retrieve timestamps received by the PHY - igb_ptp_rx_rgtstamp() and igb_ptp_rx_pktstamp(). The previous commit only changed igb_ptp_rx_rgtstamp(), and the change was incorrect. There are two instances in which PHY delay compensations should be made: - Before the packet transmission over the PHY, the latency between when the packet is timestamped and transmission of the packets, should be an add operation, but it is currently a subtract. - After the packets are received from the PHY, the latency between the receiving and timestamping of the packets should be a subtract operation, but it is currently an add. Signed-off-by: NKshitiz Gupta <kshitiz.gupta@ni.com> Fixes: 3f544d2a (igb: adjust ptp timestamps for tx/rx latency) Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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