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[melanie witt <1789074@xxxxxxxxxxxxxxxxxx>]

Okay, on IRC today, stephenfin reminded me that upstream, the
configurable RX/TX Queue Size code is new in Rocky, but that OSP
backported it all the way back to Newton. That's why Moshe is seeing the
feature code in OSP10-OSP13.

So, indeed upstream this bug is a regression in Rocky, and will have to
be backported to stable/rocky.

** Changed in: nova
   Importance: Undecided => High

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

** Changed in: nova/rocky
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1789074

Title:
  failed to boot guest with vnic_type direct when rx_queue_size and
  tx_queue_size are set

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) rocky series:
  New

Bug description:
  Description of problem:

  Nova compute forces the virtio RX/TX Queue Size also on SRIOV devices.
  This makes VM spawn to fail. The configurable RX/TX Queue Size code is similar all the way from OSP10 to OSP13, so it's possible the issue is present also on other releases.

  Version-Release number of selected component (if applicable):
  OSP13 z3

  How reproducible:

  (quick and dirty way)
  Change nova config file 

  # crudini --set /var/lib/config-data/puppet-generated/nova_libvirt/etc/nova/nova.conf libvirt rx_queue_size 1024
  # crudini --set /var/lib/config-data/puppet-generated/nova_libvirt/etc/nova/nova.conf libvirt tx_queue_size 1024
   
  # restart nova_compute container
  docker restart nova_compute

  # boot a VM with an SRIOV (PF or VF) interface

  Actual results:
  Nova add on the sriov port section rx_queue_size

      <interface type="hostdev" managed="yes">
        <mac address="fa:16:3e:9d:f0:52"/>
        <driver name="vhost" rx_queue_size="1024"/>
        <source>
          <address type="pci" domain="0x0000" bus="0x01" slot="0x14" function="0x7"/>
        </source>
        <vlan>
          <tag id="435"/>
        </vlan>

  Expected results:

      <interface type='hostdev' managed='yes'>
        <mac address='fa:16:3e:83:b2:84'/>
        <driver name='vfio'/>
        <source>
          <address type='pci' domain='0x0000' bus='0x01' slot='0x14' function='0x7'/>
        </source>
        <vlan>
          <tag id='435'/>
        </vlan>
        <alias name='hostdev0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
      </interface>

  Additional info:

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