Skip NetworkWritableMtuTest when driver is ML2/OVN

East/west icmp fragmentation is not supported with ML2/OVN since
there is no production use case, as mentioned in [1].
With this change NetworkWritableMtuTest will be skipped
automatically when ML2/OVN agents found and thus ci jobs
configs can be simplified by removing exclude list.

[1] https://docs.openstack.org/neutron/latest/ovn/gaps.html

Change-Id: I7f690b1a260ff70e12bcfac82f63e36ddca7cfbc

neutron_tempest_plugin/scenario/test_mtu.py

@@ -169,19 +169,13 @@ class NetworkWritableMtuTest(NetworkMtuBaseTest):
     servers = []
     networks = []
 
-    @classmethod
-    def skip_checks(cls):
-        super(NetworkWritableMtuTest, cls).skip_checks()
-        supported_type_drivers = ['vxlan', 'geneve']
-        if not any(type_driver in supported_type_drivers for type_driver in
-                   config.CONF.neutron_plugin_options.available_type_drivers):
-            raise cls.skipException(
-                "Neither VXLAN nor GENEVE type_driver is enabled")
-
     @classmethod
     @utils.requires_ext(extension="net-mtu-writable", service="network")
     def resource_setup(cls):
         super(NetworkWritableMtuTest, cls).resource_setup()
+        if cls.is_driver_ovn:
+            raise cls.skipException("East/west icmp fragmentation is not "
+                                    "supported with ML2/OVN")
 
     def _create_setup(self):
         self.admin_client = self.os_admin.network_client

zuul.d/2023_1_jobs.yaml

@@ -210,10 +210,6 @@
           (^neutron_tempest_plugin.scenario)|\
           (^tempest.api.compute.servers.test_attach_interfaces)|\
           (^tempest.api.compute.servers.test_multiple_create)"
-      # TODO(jlibosva): Remove the NetworkWritableMtuTest test from the list
-      # once east/west fragmentation is supported in core OVN
-      tempest_exclude_regex: "\
-          (^neutron_tempest_plugin.scenario.test_mtu.NetworkWritableMtuTest)"
       devstack_localrc:
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_ovn) | join(',') }}"
       devstack_services:

zuul.d/2023_2_jobs.yaml

@@ -205,10 +205,6 @@
           (^neutron_tempest_plugin.scenario)|\
           (^tempest.api.compute.servers.test_attach_interfaces)|\
           (^tempest.api.compute.servers.test_multiple_create)"
-      # TODO(jlibosva): Remove the NetworkWritableMtuTest test from the list
-      # once east/west fragmentation is supported in core OVN
-      tempest_exclude_regex: "\
-          (^neutron_tempest_plugin.scenario.test_mtu.NetworkWritableMtuTest)"
       devstack_localrc:
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_ovn) | join(',') }}"
       devstack_services:

zuul.d/2024_1_jobs.yaml

@@ -207,10 +207,6 @@
           (^neutron_tempest_plugin.scenario)|\
           (^tempest.api.compute.servers.test_attach_interfaces)|\
           (^tempest.api.compute.servers.test_multiple_create)"
-      # TODO(jlibosva): Remove the NetworkWritableMtuTest test from the list
-      # once east/west fragmentation is supported in core OVN
-      tempest_exclude_regex: "\
-          (^neutron_tempest_plugin.scenario.test_mtu.NetworkWritableMtuTest)"
       devstack_localrc:
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_ovn) | join(',') }}"
       devstack_local_conf:

zuul.d/master_jobs.yaml

@@ -627,10 +627,6 @@
       network_api_extensions_ovn:
         - vlan-transparent
         - external-gateway-multihoming
-      # TODO(jlibosva): Remove the NetworkWritableMtuTest test from the list
-      # once east/west fragmentation is supported in core OVN
-      tempest_exclude_regex: "\
-          (^neutron_tempest_plugin.scenario.test_mtu.NetworkWritableMtuTest)"
       devstack_localrc:
         Q_AGENT: ovn
         OVN_AGENT_EXTENSIONS: 'metadata'

zuul.d/zed_jobs.yaml

@@ -186,8 +186,6 @@
           (^neutron_tempest_plugin.scenario)|\
           (^tempest.api.compute.servers.test_attach_interfaces)|\
           (^tempest.api.compute.servers.test_multiple_create)"
-      tempest_exclude_regex: "\
-          (^neutron_tempest_plugin.scenario.test_mtu.NetworkWritableMtuTest)"
       network_api_extensions: *api_extensions
       network_api_extensions_ovn:
         - vlan-transparent