Can NVIDIA ConnectX-7 (MCX755106AC-HEAT) Support 100G x1 (Single-Lane 100G)?

Infrastructure & Networking Adapters and Cables Ethernet Adapter Cards
1

I am using ConnectX-7 (P/N: MCX755106AC-HEAT). It is a dual QSFP port NIC. I have connected QSFP112G-400G cable to it and trying to bring-up 100G x1 link.
But I am unable to do so. I can see in ethtool utility that, ConnectX-7 do supports,

  • 100000baseKR/Full
  • 100000baseSR/Full
  • 100000baseLR_ER_FR/Full
  • 100000baseCR/Full
  • 100000baseDR/Full
  1. Does this supports 100G x1 config ?
  2. If Yes, Please let me know why 100G x1 link is not happening with connectX-7 NIC ?

Please let me know if I am missing anything here.

2

Hi amarnathpujari18,

First of all, yes, our CX7 (MCX755106AC-HEAT) Supports 100G speed.
But at this moment, I am not sure your QSFP112 cable capability.

  1. Please check the “Supported Cable Speed” from the “# mlxlink -d xx:xx.x -m” command output.
    Note: xx:xx.x is the bdf of this CX7 NIC corresponding PF port, our you can use the mst device name “/dev/mst/mt4129_pciconfX” instead.

  2. If your cable support 100G speed, and your switch up-layer port supports 100G as well, and with Auto Negotiation, then you can use the following commands to try to set the speed to 100G.
    mlxlink -d xx:xx.x -s 100G --link_mode_force
    mlxlink -d xx:xx.x
    mlxlink -d xx:xx.x -a tg
    mlxlink -d xx:xx.x

Thanks!