Traffic fails when configuring an NSX-T transport node with ENS Interrupt mode

Products

• VMware NSX Networking

Issue/Introduction

Symptoms:

• NSX-T version is 3.2 or above.
• You are configuring a transport node(s) to use ENS (Enhanced Networking Stack) with interrupt mode.
• You are using an NVDS (NSX-T Managed Virtual Distributed Switch) for this configuration.
• When the host is configured with ENS Standard mode, the traffic works fine.
• When the host is reconfigured to use ENS Interrupt mode, the traffic fails.
• You are running driver: 

nmlx5 async driver 4.21.71.101

• In the vmkernel.log of the host we can see the ENS Interrupt mode was set correctly:

2023-05-16T11:32:00.076Z cpu0:2097509)ENS: 1392: Setting ENS mode to 2 for DvsPortset-0

Environment

VMware NSX-T

Cause

There is a known issue with the partner driver when using ENS and NSX-T 3.2 or above.

Resolution

Please review the partner guide for further details: 
https://docs.nvidia.com/networking/display/VMwareRNv42171101/Known+Issues

Workaround:
Upgrade the NIC driver/firmware to at least 4.22.73.1004. Please consult with partner and the VMware interoperability matrix before upgrading.

Please review the partner guide for further details: 
https://docs.nvidia.com/networking/display/VMwareRNv42171101/Known+Issues