Honour the linuxbridge experimental status

This patch follows upstream and disables linuxbridge testing.
Users are notified of the situation via the release note.

Change-Id: I524682ceb5287c14ef0ba99baae0c081850f4c5e

README.rst

@@ -97,7 +97,7 @@ Kolla Ansible deploys containers for the following infrastructure components:
 - `MariaDB and Galera Cluster <https://mariadb.com/kb/en/mariadb/galera-cluster/>`__
   for highly available MySQL databases.
 - `Memcached <https://memcached.org/>`__ a distributed memory object caching system.
-- `Open vSwitch <https://openvswitch.org/>`__ and Linuxbridge backends for Neutron.
+- `Open vSwitch <https://openvswitch.org/>`__ for use with Neutron.
 - `RabbitMQ <https://www.rabbitmq.com/>`__ as a messaging backend for
   communication between services.
 - `Redis <https://redis.io/>`__ an in-memory data structure store.

ansible/group_vars/all.yml

@@ -254,6 +254,8 @@ dpdk_tunnel_interface_address: "{{ 'dpdk_tunnel' | kolla_address }}"
 ironic_http_interface_address: "{{ 'ironic_http' | kolla_address }}"
 
 # Valid options are [ openvswitch, ovn, linuxbridge, vmware_nsxv, vmware_nsxv3, vmware_nsxp, vmware_dvs ]
+# Do note linuxbridge is *EXPERIMENTAL* in Neutron since Zed and it requires extra tweaks to config to be usable.
+# For details, see: https://docs.openstack.org/neutron/latest/admin/config-experimental-framework.html
 neutron_plugin_agent: "openvswitch"
 
 # Valid options are [ internal, infoblox ]

etc/kolla/globals.yml

@@ -147,6 +147,8 @@ workaround_ansible_issue_8743: yes
 
 # Valid options are [ openvswitch, ovn, linuxbridge, vmware_nsxv, vmware_nsxv3, vmware_nsxp, vmware_dvs ]
 # if vmware_nsxv3 or vmware_nsxp is selected, enable_openvswitch MUST be set to "no" (default is yes)
+# Do note linuxbridge is *EXPERIMENTAL* in Neutron since Zed and it requires extra tweaks to config to be usable.
+# For details, see: https://docs.openstack.org/neutron/latest/admin/config-experimental-framework.html
 #neutron_plugin_agent: "openvswitch"
 
 # Valid options are [ internal, infoblox ]

releasenotes/notes/linuxbridge-is-experimental-in-neutron-8a12590100e47710.yaml

@@ -0,0 +1,10 @@
+---
+upgrade:
+  - |
+    Starting with Zed, Neutron marked the ``linuxbridge`` ML2 driver
+    experimental. The Kolla team has decided to honour the upstream's
+    decision and make sure users are aware they are using a badly
+    supported driver instead of having it configured out of the box.
+    Thus, all users of this driver are advised to get acquainted with
+    `Neutron docs <https://docs.openstack.org/neutron/latest/admin/config-experimental-framework.html>`__
+    and proceed accordingly.

tests/run.yml

@@ -21,7 +21,7 @@
         need_build_image: false
         build_image_tag: "change_{{ zuul.change | default('none') }}"
         openstack_core_enabled: "{{ openstack_core_enabled }}"
-        openstack_core_tested: "{{ scenario in ['core', 'cephadm', 'zun', 'cells', 'swift', 'linuxbridge', 'ovn'] }}"
+        openstack_core_tested: "{{ scenario in ['core', 'cephadm', 'zun', 'cells', 'swift', 'ovn'] }}"
         dashboard_enabled: "{{ openstack_core_enabled or scenario in ['monasca'] }}"
         upper_constraints_file: "{{ ansible_env.HOME }}/src/opendev.org/openstack/requirements/upper-constraints.txt"
         docker_image_tag_suffix: "{{ '-aarch64' if ansible_architecture == 'aarch64' else '' }}"

tests/templates/globals-default.j2

@@ -151,10 +151,6 @@ rabbitmq_enable_tls: "yes"
 libvirt_tls: "yes"
 {% endif %}
 
-{% if scenario == 'linuxbridge' %}
-neutron_plugin_agent: "linuxbridge"
-{% endif %}
-
 {% if scenario == "ovn" %}
 neutron_plugin_agent: "ovn"
 neutron_ovn_distributed_fip: "yes"

zuul.d/base.yaml

@@ -201,16 +201,6 @@
     vars:
       scenario: cells
 
-- job:
-    name: kolla-ansible-linuxbridge-base
-    parent: kolla-ansible-base
-    voting: false
-    files:
-      - ^ansible/roles/neutron/
-      - ^tests/test-core-openstack.sh
-    vars:
-      scenario: linuxbridge
-
 - job:
     name: kolla-ansible-ovn-base
     parent: kolla-ansible-base

zuul.d/jobs.yaml

@@ -350,20 +350,6 @@
     vars:
       base_distro: centos
 
-- job:
-    name: kolla-ansible-ubuntu-source-linuxbridge
-    parent: kolla-ansible-linuxbridge-base
-    nodeset: kolla-ansible-jammy
-    vars:
-      base_distro: ubuntu
-
-- job:
-    name: kolla-ansible-centos8s-source-linuxbridge
-    parent: kolla-ansible-linuxbridge-base
-    nodeset: kolla-ansible-centos8s
-    vars:
-      base_distro: centos
-
 - job:
     name: kolla-ansible-centos8s-source-ovn
     parent: kolla-ansible-ovn-base

zuul.d/project.yaml

@@ -44,8 +44,6 @@
         # - kolla-ansible-centos8s-source-cells
         # - kolla-ansible-centos8s-source-mariadb
         - kolla-ansible-ubuntu-source-mariadb
-        # - kolla-ansible-centos8s-source-linuxbridge
-        - kolla-ansible-ubuntu-source-linuxbridge
         # - kolla-ansible-centos8s-source-ovn
         - kolla-ansible-ubuntu-source-ovn
         # - kolla-ansible-centos8s-source-upgrade-ovn