DPDK 21.11: __hn_nvs_execute() error on Hyper-V

[Kishan Simha (ksimha)]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mails.dpdk.org/archives/users/attachments/20251007/17d6a345/attachment.htm>