Hello DPDK community,

 I am encountering an issue with the Hyper-V network driver (net_netvsc) when running a DPDK application in a virtual machine environment.

I consistently see the following error logged:

__hn_nvs_execute(): invalid NVS resp len 32 (expect 40)

hn_dev_configure(): subchannel configuration failed

The issue was not present when using DPDK version 19.11.3 on the same VM and Hyper-V setup.

The issue began after migrating to DPDK version 21.11.0. The application fails to initialize the network ports with this error.

Hyper-V Host OS : Window Server 2019

Guest OS : Linux version 5.10

Based on the version information, it appears a change between DPDK 19 and 21.11 is causing a communication incompatibility with my Hyper-V environment. Is this a known regression, and are there any recommended workarounds or patches available? Has anyone else observed this behavior?

Any insight or direction would be greatly appreciated.

Regards,

Kishan