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Beginner
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Regarding Hard time stamping in Intel NIC

Hi,

I am Kuralamudhan Ramakrishnan working in NetApp, Munich. I am currently working in a project to get hardware time stamping between source and destination server using Linux time stamping options. I am using i40e (Driver: Intel(R) Ethernet Connection XL710 Network Driver - version 1.0.11-k) Intel Network Interface Controller. The linux 3.18 support bytestream time stamping, that is Transmit Hardware Timestamping and it doesn't support the Receive Hardware Time stamping for TCP socket. I like to know the vendor specific API's which could support the Hardware timestamping for the TCP packets(like i40e_ptp_gettime).

My NIC support the following time stamp capabilities.

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: 2

Hardware Transmit Timestamp Modes:

off (HWTSTAMP_TX_OFF)

on (HWTSTAMP_TX_ON)

Hardware Receive Filter Modes:

none (HWTSTAMP_FILTER_NONE)

ptpv1-l4-sync (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)

ptpv1-l4-delay-req (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)

ptpv2-l4-event (HWTSTAMP_FILTER_PTP_V2_L4_EVENT)

ptpv2-l4-sync (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)

ptpv2-l4-delay-req (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)

ptpv2-l2-event (HWTSTAMP_FILTER_PTP_V2_L2_EVENT)

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)

I like to know whether there is any other Intel NIC which have the capability for SOF_TIMESTAMPING_TX_ACK, I require this time stamping to calculate the precise RTT measurement between source and destination.

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3 Replies
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New Contributor III
35 Views

Hi rk_amudhan,

Thanks for the post. will check on this.

rgds,

wb

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New Contributor III
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Hi rk-amudhan,

The NIC does not support hardware time stamping of generic Rx packets.It only supports PTP specific filters.

Hope this clarified.

rgds,

wb

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New Contributor III
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Hi rk_amudhan,

I210T is a gigabit server adapter that can support time-stamping.

With regards to the API, we dont have vendor specific API.

thanks,

wb

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