ConnectX-8 C8180 no longer enumerates on PCIe after wrong mlxconfig PCI bus

Infrastructure & Networking Adapters and Cables Ethernet Adapter Cards
1

Hi,

I have a NVIDIA ConnectX-8 C8180 SuperNIC. The card was previously detected and operational, and I was able to use it in both InfiniBand and Ethernet mode during testing.

During PCIe topology experimentation, adding a PCIe expansion kit (PCIe bifurcation ) on a Gen3 x16 I/F, I changed the following fields with mlxconfig:

sudo mlxconfig -d /dev/mst/mt4131_pciconf0 set PCI_BUS01_WIDTH=5
sudo mlxconfig -d /dev/mst/mt4131_pciconf0 set PCI_BUS01_SPEED=2

After reboot/power cycle, the card no longer enumerates. I have tried on two different hosts.

  • Kernel used during testing: 6.8.0-106-generic
  • Card model/family: ConnectX-8 / MT4131 / C8180

Is there a on-board HW reset (Header/jumpers) or is an external module (like MTUSB) avaialble to reconfigure to the default mode (IB single port).

Thank you for your help and inputs.

3

Hello,

Can you check if you still see the card (its MST device) under “mst start; mst status -v”?

If so, run the below to reset the mlxconfig settings to default:

mlxconfig -d /dev/mst/mt4131_pciconf0 reset

If the MST device is not detected, recovery would require a special kit (MTUSB with a dedicated cable for the ConnectX-8 card). In that case, please open a support ticket so we can assist further.

Best regards,
Viki

4

Hi Vikiz,

Thanks you for the answer.

I confirm mst is not started and therefore the card can not be resetted via the command mlxconfig -d /dev/mst/mt4131_pciconf0 reset.

I will open a support ticket to have more info on MTUSB .

Thank you

5

Hi Vikiz,

Could you point me to a ressource or link to submit a support ticket.

Thank you