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 mlx4_en(Driver: Mellanox ConnectX HCA Ethernet driver v2.2-1 (Feb 2014)) Mellanox 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 in mlx4_en_process_rx_cq(), where timestamp is filled by mlx4_en_fill_hwtstamps).
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: 3
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
all (HWTSTAMP_FILTER_ALL)
I like to know whether there is any other Mellanox 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.
