How to check NIC will supports hardware or software time stamping in linux ?

using  ethtool -T  <interface>  will give u information about nic which supports which type of time stamping.

 ethtool -T|--show-time-stamping DEVNAME Show time stamping capabilities


Example:

 ethtool -T em1

Time stamping parameters for em1:
Capabilities:
        hardware-transmit     (SOF_TIMESTAMPING_TX_HARDWARE)
        software-transmit     (SOF_TIMESTAMPING_TX_SOFTWARE)
        hardware-receive      (SOF_TIMESTAMPING_RX_HARDWARE)
        software-receive      (SOF_TIMESTAMPING_RX_SOFTWARE)
        software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
        hardware-raw-clock    (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
        off                   (HWTSTAMP_TX_OFF)
        on                    (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
        none                  (HWTSTAMP_FILTER_NONE)
        all                   (HWTSTAMP_FILTER_ALL)
        ptpv1-l4-sync         (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)
        ptpv1-l4-delay-req    (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)
        ptpv2-l4-sync         (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)
        ptpv2-l4-delay-req    (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)
        ptpv2-l2-sync         (HWTSTAMP_FILTER_PTP_V2_L2_SYNC)
        ptpv2-l2-delay-req    (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ)
        ptpv2-event           (HWTSTAMP_FILTER_PTP_V2_EVENT)
        ptpv2-sync            (HWTSTAMP_FILTER_PTP_V2_SYNC)
        ptpv2-delay-req       (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ)

Example2:

ethtool -T eth0

Time stamping parameters for eth0:

Capabilities:

        hardware-transmit     (SOF_TIMESTAMPING_TX_HARDWARE)

        software-transmit     (SOF_TIMESTAMPING_TX_SOFTWARE)

        hardware-receive      (SOF_TIMESTAMPING_RX_HARDWARE)

        software-receive      (SOF_TIMESTAMPING_RX_SOFTWARE)

        software-system-clock (SOF_TIMESTAMPING_SOFTWARE)

        hardware-raw-clock    (SOF_TIMESTAMPING_RAW_HARDWARE)

PTP Hardware Clock: 1

Hardware Transmit Timestamp Modes:

        off                   (HWTSTAMP_TX_OFF)

        on                    (HWTSTAMP_TX_ON)

Hardware Receive Filter Modes:

        none                  (HWTSTAMP_FILTER_NONE)

        all                   (HWTSTAMP_FILTER_ALL)