Re-enable uWSGI as default for Neutron

Neutron team has reportedly addressed issues with uWSGI for the service
including OVN within [1]. Solution requires deployment of 2 new services
while one should be running whenever WSGI is used, where second is
needed specifically for OVN scenario.

neutron-ovn-maintenance-worker is conditionally enabled to avoid
systemd service deployment for non-OVN scenarios, as we do not support
switching neutron_plugin_type back and force at the moment.

[1] https://bugs.launchpad.net/neutron/+bug/1912359

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/935664
Change-Id: I9340d1dc94a6aa1a962bdc10b97439aa1fdc8658

defaults/main.yml

@@ -183,18 +183,19 @@ _neutron_rootwrap_conf_overrides:
 neutron_rootwrap_conf_overrides: {}
 
 neutron_api_uwsgi_ini_overrides: {}
-neutron_server_init_overrides: {}
+neutron_periodic_workers_init_overrides: {}
 neutron_rpc_server_init_overrides: {}
+neutron_server_init_overrides: {}
 neutron_sriov_nic_agent_ini_overrides: {}
 neutron_sriov_nic_agent_init_overrides: {}
+neutron_ovn_maintenance_init_overrides: {}
 neutron_ovn_metadata_agent_ini_overrides: {}
 neutron_ovn_metadata_agent_init_overrides: {}
 
 ###
 ### UWSGI
 ###
-# NOTE(noonedeadpunk): uWSGI is still not fully supported. See: https://bugs.launchpad.net/neutron/+bug/1912359
+neutron_use_uwsgi: True
-neutron_use_uwsgi: False
 neutron_wsgi_processes_max: 16
 neutron_wsgi_processes: "{{ [[ansible_facts['processor_vcpus'] | default(1), 1] | max * 2, neutron_wsgi_processes_max] | min }}"
 neutron_wsgi_threads: 1

releasenotes/notes/neutron_uwsgi_re-enabled-d75d0362aaf32278.yaml

@@ -0,0 +1,24 @@
+---
+upgrade:
+  - |
+    uWSGI has been re-enabled by default for Neutron one more time. With that
+    new services are introduced which should ensure adequate functionality of
+    Neutron when uWSGI is being used.
+
+      - ``neutron-periodic-workers`` service is enabled for all drivers when
+        WSGI is being used. It runs along with previously existing
+        ``neutron-rpc-server``
+
+      - ``neutron-ovn-maintenance-worker`` service is added only if `ml2.ovn`
+        is being used as ``neutron_plugin_type``. The service will be enabled
+        and running only when WSGI is used for Neutron ``neutron_use_uwsgi`` is
+        set to `True`
+
+  - |
+    If you are using Ubuntu 22.04 Jammy Jellyfish and ``install_method: distro``
+    please make sure to disable ``neutron_use_uwsgi`` as required binaries for
+    this mode to work are missing from packages for this distro.
+fixes:
+  - |
+    Issues with uWSGI mode for Neutron has been addressed and uWSGI be used
+    for the service.

vars/main.yml

@@ -513,6 +513,31 @@ neutron_services:
       {% if ('ml2.genericswitch' in neutron_plugin_types) -%}
       --config-file {{ neutron_conf_dir }}/{{ neutron_plugins['ml2.genericswitch'].plugin_ini }}
       {% endif %}
+  neutron-periodic-workers:
+    group: neutron_server
+    service_name: neutron-periodic-workers
+    service_en: True
+    enabled: "{{ neutron_use_uwsgi }}"
+    state: "{{ neutron_use_uwsgi | ternary('started', 'stopped') }}"
+    init_config_overrides: "{{ neutron_periodic_workers_init_overrides | combine(neutron_server_init_overrides) }}"
+    start_order: 2
+    execstarts: >-
+      {{ neutron_bin }}/neutron-periodic-workers --config-file {{ neutron_conf_dir }}/neutron.conf
+      --config-file {{ neutron_conf_dir }}/{{ neutron_plugins[neutron_plugin_type].plugin_ini }}
+      {% if ('ml2.genericswitch' in neutron_plugin_types) -%}
+      --config-file {{ neutron_conf_dir }}/{{ neutron_plugins['ml2.genericswitch'].plugin_ini }}
+      {% endif %}
+  neutron-ovn-maintenance-worker:
+    group: neutron_server
+    service_name: neutron-ovn-maintenance-worker
+    service_en: "{{ neutron_plugin_type == 'ml2.ovn' }}"
+    enabled: "{{ neutron_use_uwsgi and neutron_plugin_type == 'ml2.ovn' }}"
+    state: "{{ (neutron_use_uwsgi and neutron_plugin_type == 'ml2.ovn') | ternary('started', 'stopped') }}"
+    init_config_overrides: "{{ neutron_ovn_maintenance_init_overrides | combine(neutron_server_init_overrides) }}"
+    start_order: 2
+    execstarts: >-
+      {{ neutron_bin }}/neutron-ovn-maintenance-worker --config-file {{ neutron_conf_dir }}/neutron.conf
+      --config-file {{ neutron_conf_dir }}/{{ neutron_plugins[neutron_plugin_type].plugin_ini }}
   neutron-sriov-nic-agent:
     group: neutron_sriov_nic_agent
     service_name: neutron-sriov-nic-agent