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[Bug 2128073] [NEW] If "service_plugin" qos is loaded, it is mandatory to have "extension_driver" qos configured too

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Rodolfo Alonso <2128073@xxxxxxxxxxxxxxxxxx>
Date: Thu, 16 Oct 2025 13:36:49 -0000
Reply-to: Bug 2128073 <2128073@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Public bug reported:

Since [1], if the QoS "service_plugin" is loaded (ML2/OVN: always
configured, hardcoded; ML2/OVS: almost always configured), it is
mandatory to also configure the QoS "extension_driver". If the
"extension_driver" is missing, the Neutron API process will fail
starting.

The goal of this bug is to open a discussion about adding automatically
the QoS "extension_driver" if the QoS "service_plugin" is loaded.

[1]https://review.opendev.org/c/openstack/neutron/+/253853/9/neutron/plugins/ml2/plugin.py#183

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2128073

Title:
  If "service_plugin" qos is loaded, it is mandatory to have
  "extension_driver" qos configured too

Status in neutron:
  New

Bug description:
  Since [1], if the QoS "service_plugin" is loaded (ML2/OVN: always
  configured, hardcoded; ML2/OVS: almost always configured), it is
  mandatory to also configure the QoS "extension_driver". If the
  "extension_driver" is missing, the Neutron API process will fail
  starting.

  The goal of this bug is to open a discussion about adding
  automatically the QoS "extension_driver" if the QoS "service_plugin"
  is loaded.

  [1]https://review.opendev.org/c/openstack/neutron/+/253853/9/neutron/plugins/ml2/plugin.py#183

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