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<p class="xmsonormal"><span style="font-family:"inherit",serif">Hi </span><o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal" style="background:white;vertical-align:baseline"><span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729">I am working in Avadesh sir’s team for the 5G RAN development. We were trying to bring up an L2 VM setup for testing
using the latest versions of DPDK and OVS.</span><o:p></o:p></p>
<p class="xmsonormal" style="background:white;vertical-align:baseline"><span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729"> </span><o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729">We were trying to bring up a virtual switch setup using DPDK-19.11 and OVS-2.12.0 versions. The DPDk and OVS scripts compile successfully and we were able to bring up a VMs using QEMU
emulator version 2.12.1 and were able to access it by an ssh session. But the VM loses network connectivity after we do some basic UDP packet communication via the VM DPDK ports. The following error log is thrown :</span><o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729;background:yellow">qemu-system-x86_64: vhost VQ 0 ring restore failed: -1: Input/output error (5)<br>
qemu-system-x86_64: Failed to read msg header. Read 0 instead of 12. Original r.<br>
qemu-system-x86_64: vhost VQ 1 ring restore failed: -1: Invalid argument (22)<br>
qemu-system-x86_64: Failed to read from slave.<br>
qemu-system-x86_64: Failed to set msg fds.<br>
qemu-system-x86_64: vhost VQ 0 ring restore failed: -1: Resource temporarily un)<br>
qemu-system-x86_64: Failed to set msg fds.<br>
qemu-system-x86_64: vhost VQ 1 ring restore failed: -1: Resource temporarily un)</span><o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729">Bringing up the same setup using DPDK-17.11.4 and OVS-2.9.0 works well.</span><o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729">We are unable to understand what prompted this error to come up. Is it an issue with the OVS version and its compatibility with the DPDK version or something else?</span><o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729">Please let me know if you have any idea on how we can solve this issue.</span><o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729"> </span><o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729">Thanks & Regards</span><o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:12.0pt;font-family:"inherit",serif;color:#242729">Farhan</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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