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<p class="MsoNormal">Hello DPDK community,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> I am encountering an issue with the Hyper-V network driver (net_netvsc) when running a DPDK application in a virtual machine environment.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I consistently see the following error logged:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">__hn_nvs_execute(): invalid NVS resp len 32 (expect 40)<o:p></o:p></p>
<p class="MsoNormal">hn_dev_configure(): subchannel configuration failed<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:Roboto;color:#0A0A0A;background:white">The issue was not present when using DPDK version 19.11.3 on the same VM and Hyper-V setup.
<o:p></o:p></span></p>
<p class="MsoNormal">The issue began after migrating to DPDK version 21.11.0. The application fails to initialize the network ports with this error.<span style="font-family:Roboto;color:#0A0A0A;background:white"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hyper-V Host OS : Window Server 2019<o:p></o:p></p>
<p class="MsoNormal">Guest OS : Linux version 5.10<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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?<o:p></o:p></p>
<p class="MsoNormal">Any insight or direction would be greatly appreciated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Kishan<o:p></o:p></p>
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