Test Neutron API restart time

The new test added checks that the time spent to restart the Neutron API
doesn't take more than one minute.

Closes-Bug: #OSPRH-2460
Change-Id: I467f6c2124b8e3d6eb76bea399fd9cc5bd553b5c

whitebox_neutron_tempest_plugin/tests/scenario/test_api_server.py

@@ -0,0 +1,66 @@
+# Copyright 2024 Red Hat, Inc.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import random
+
+from oslo_log import log
+from oslo_utils import timeutils
+from tempest import config
+
+from whitebox_neutron_tempest_plugin.common import utils as wb_utils
+from whitebox_neutron_tempest_plugin.tests.scenario import base as wb_base
+
+
+CONF = config.CONF
+WB_CONF = CONF.whitebox_neutron_plugin_options
+LOG = log.getLogger(__name__)
+
+
+class NeutronAPIServerTest(wb_base.BaseTempestTestCaseOvn):
+
+    @classmethod
+    def resource_setup(cls):
+        super().resource_setup()
+        cls.discover_nodes()
+
+    def test_neutron_api_restart(self):
+        # 1) Checks the Neutron API is responding and init the timer.
+        wb_utils.wait_for_neutron_api(self.client)
+        t1 = timeutils.utcnow()
+
+        # 2) Do a trivial configuration change. In a "podified" environment,
+        # that will trigger the Neutron API restart. In a "devstack"
+        # environment, it will be needed to manually restart the Neutron API
+        # server.
+        self.set_service_setting(file=wb_utils.get_ml2_conf_file(),
+                                 section='ovn',
+                                 param='fdb_age_threshold',
+                                 value=random.randint(10000, 90000))
+
+        # 3) Restart Neutron API on all controllers simultaneously.
+        if not WB_CONF.openstack_type == 'podified':
+            service_ptn = wb_utils.get_neutron_api_service_name()
+            for node in self.nodes:
+                if node['is_controller']:
+                    # NOTE(mblue): if reset fails on multinode, consider
+                    # wait_until_active=False for a more simultaneous reset
+                    self.reset_node_service(service_ptn, node['client'])
+
+        wb_utils.wait_for_neutron_api(self.client)
+        t2 = timeutils.utcnow()
+        tdelta = t2 - t1
+        self.assertLess(tdelta.seconds, 120,
+                        msg='The Neutron API took more than 120 seconds to '
+                            'restart')

zuul.d/master_jobs.yaml

@@ -35,7 +35,8 @@
         (^whitebox_neutron_tempest_plugin.*test_previously_used_ip)|\
         (^whitebox_neutron_tempest_plugin.tests.scenario.test_ovn_dbs.OvnDbsMonitoringTest.*)|\
         (^whitebox_neutron_tempest_plugin.*ovn_controller_restart)|\
-        (^whitebox_neutron_tempest_plugin.tests.scenario.test_ovn_fdb.*)"
+        (^whitebox_neutron_tempest_plugin.tests.scenario.test_ovn_fdb.*)|\
+        (^whitebox_neutron_tempest_plugin.tests.scenario.test_api_server.*)"
       devstack_localrc:
         USE_PYTHON3: true
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_tempest) | join(',') }}"
@@ -446,7 +447,8 @@
         (^whitebox_neutron_tempest_plugin.*test_previously_used_ip)|\
         (^whitebox_neutron_tempest_plugin.tests.scenario.test_ovn_dbs.OvnDbsMonitoringTest.*)|\
         (^whitebox_neutron_tempest_plugin.*ovn_controller_restart)|\
-        (^whitebox_neutron_tempest_plugin.tests.scenario.test_ovn_fdb.*)"
+        (^whitebox_neutron_tempest_plugin.tests.scenario.test_ovn_fdb.*)|\
+        (^whitebox_neutron_tempest_plugin.tests.scenario.test_api_server.*)"
       # NOTE(mblue): Enable metadata rate limiting tests
       # when OSPRH-9569 is resolved (feature code available in RHOSO).
       tempest_exclude_regex: "\