Unable to Switch CX8 from 2-Port Ethernet Mode Back to 1-Port InfiniBand Mode

Infrastructure & Networking DOCA Enterprise Networking
1

Hi everyone,

I’m currently working on a ConnectX-8 adapter and trying to switch it from Ethernet mode to InfiniBand mode. I’m facing an issue where, in Ethernet mode, the card presents two logical Ethernet ports, but when switching back to InfiniBand mode, I’m unable to merge them into a single physical IB port as expected.

Has anyone experienced this behavior before, and could you share guidance on how to correctly configure the adapter?

Additionally, I would appreciate any information on how to set the required configuration parameters using connamd or mlxconfig for this mode transition.

Thank you in advance for your help!

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Hello,

Thank you for posting your question to the NVIDIA Developer Forums

If the initial configuration for you adapter was one physical IB port, then the most simple way to revert back would be to use the command mlxconfig -d reset

Note however the reset action will revert all settings on the device, including any other specific settings you have modified

For instructions on port configuration we have the following page which provides instructions on how to setup each particular port configuration for different ConnectX-8 adapters:

If you have any further questions or encounter any issues, please reach out to us using the NVIDIA enterprise support portal which can be found here:

Thank you,

NVEX Networking Technical Support Team

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Thanks for your help. Following the FAE’s suggestion, we found that the RDMA parameter was not set. After configuring it, the CX8 is working normally.