Dell Mellanox Family of Adapters - Manual (Page 33)

User Manual for Mellanox ConnectX®-3 10/40 Gigabit Ethernet Adapters for Dell PowerEdge Servers Rev 1.1
Mellanox Technologies 33
• Call setsockopt() with SO_TIMESTAMPING and with the following flags:
SOF_TIMESTAMPING_TX_HARDWARE: try to obtain send time stamp in hardware
SOF_TIMESTAMPING_TX_SOFTWARE: if SOF_TIMESTAMPING_TX_HARDWARE is off or
fails, then do it in software
SOF_TIMESTAMPING_RX_HARDWARE: return the original, unmodified time stamp
as generated by the hardware
SOF_TIMESTAMPING_RX_SOFTWARE: if SOF_TIMESTAMPING_RX_HARDWARE is off or
fails, then do it in software
SOF_TIMESTAMPING_RAW_HARDWARE: return original raw hardware time stamp
SOF_TIMESTAMPING_SYS_HARDWARE: return hardware time stamp transformed to
the system time base
SOF_TIMESTAMPING_SOFTWARE: return system time stamp generated in
software
SOF_TIMESTAMPING_TX/RX determine how time stamps are generated.
SOF_TIMESTAMPING_RAW/SYS determine how they are reported