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Configure FEC:

mstlink -d <device> -p <port_number> --fec RS

Configure Port for Physical Test Mode:

mstlink -d <device> -p <port_number> --test_mode EN (--rx_prbs PRBS31 --rx_rate

25G --tx_prbs PRBS7 --tx_rate 10G)

Perform PRBS Tuning:

mstlink -d <device> -p <port_number> --test_mode TU

Configure Transmitter Parameters (on lane, to database):

mstlink -d <device> -p <port_number> --serdes_tx <polar-

ity>,<ob_tap0>,<ob_tap1>,<ob_tap2>,<ob_bias>,<ob_preemp_mode>,<ob_reg>,<ob_leva>

(--serdes_tx_lane <lane number>) (--database)

Print the output in json format:

mstlink -d <device> --show_module --json

Tool Usage with NIC vs. Switch (-p Flag)

When using mstlink on Quantum HDR switch split ports, make sure you use the split formula below to

calculate the port number:

mstlink -d lid-<LID> -p <formula>

Formula :

portnum = round_down[(Iblinkinfo_port_num + 1)*0.5]

if (Iblinkinfo_port_num + 1) modulo 2 = 1 then add ‘/2’

in case of 4X port, use only item #1 above

Example:

43 23[ ] ==( 2X 53.125 Gbps Active/ LinkUp)==> mstlink -d lid-43 -p 12

43 24[ ] ==( 2X 53.125 Gbps Active/ LinkUp)==> mstlink -d lid-43 -p 12/2

When using mstlink tool with NIC, notice that the "label_port" flag -p should not be used. To address

different ports please use different mst devices.

For example:

To address port 1 in ConnectX-4 use:

mstlink -d 41:00.0

To address port 2 use:

mstlink -d 41:00.1

Nvidia MSTFLINT User Manual

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