Revert "[OVN][Trunk] Set the subports correct host during live migration"

This reverts commit 1ce5ef7.

Reason for revert: the port binding handling done in this patch is
incorrect and leads to issues during the cold migration process with
trunk ports in ML2/OVN.

Change-Id: I779b13f10f20f95c4963e0e1667566e4589beb76
Partial-Bug: #2033887

Author: ralonsoh

neutron/services/trunk/drivers/ovn/trunk_driver.py

@@ -14,7 +14,6 @@
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
 from neutron_lib.callbacks import resources
-from neutron_lib import constants as n_const
 from neutron_lib import context as n_context
 from neutron_lib.db import api as db_api
 from neutron_lib import exceptions as n_exc
@@ -52,11 +51,7 @@ def _set_sub_ports(self, parent_port, subports):
         context = n_context.get_admin_context()
         db_parent_port = port_obj.Port.get_object(context, id=parent_port)
         parent_port_status = db_parent_port.status
-        try:
-            parent_port_bindings = [pb for pb in db_parent_port.bindings
-                                    if pb.status == n_const.ACTIVE][-1]
-        except IndexError:
-            parent_port_bindings = None
+        parent_port_bindings = db_parent_port.bindings[0]
         for subport in subports:
             with db_api.CONTEXT_WRITER.using(context), (
                     txn(check_error=True)) as ovn_txn:
@@ -90,10 +85,8 @@ def _set_binding_profile(self, context, subport, parent_port,
             db_port.id, db_port, ovn_const.TYPE_PORTS)
         ovn_txn.add(check_rev_cmd)
         parent_binding_host = ''
-        if parent_port_bindings and parent_port_bindings.host:
-            migrating_to = parent_port_bindings.profile.get(
-                ovn_const.MIGRATING_ATTR)
-            parent_binding_host = migrating_to or parent_port_bindings.host
+        if parent_port_bindings.host:
+            parent_binding_host = parent_port_bindings.host
         try:
             # NOTE(flaviof): We expect binding's host to be set. Otherwise,
             # sub-port will not transition from DOWN to ACTIVE.

neutron/tests/functional/services/trunk/drivers/ovn/test_trunk_driver.py

@@ -97,23 +97,13 @@ def _verify_trunk_info(self, trunk, has_items, host=''):
         if trunk.get('status'):
             self.assertEqual(trunk_consts.TRUNK_ACTIVE_STATUS, trunk['status'])
 
-    def _bind_port(self, port_id, host_source, host_dest=None):
+    def _bind_port(self, port_id, host):
         with db_api.CONTEXT_WRITER.using(self.context):
-            for pb in port_obj.PortBinding.get_objects(self.context,
-                                                       port_id=port_id):
-                pb.delete()
-            profile = {}
-            if host_dest:
-                # When "host_dest" there are 2 port bindings, as in a live
-                # migration; the second one (destination host) is inactive.
-                profile[ovn_const.MIGRATING_ATTR] = host_dest
-                port_obj.PortBinding(
-                    self.context, port_id=port_id, host=host_dest,
-                    vif_type=portbindings.VIF_TYPE_OVS,
-                    status=n_consts.INACTIVE).create()
-            port_obj.PortBinding(
-                self.context, port_id=port_id, host=host_source,
-                profile=profile, vif_type=portbindings.VIF_TYPE_OVS).create()
+            pb = port_obj.PortBinding.get_object(self.context,
+                                                 port_id=port_id, host='')
+            pb.delete()
+            port_obj.PortBinding(self.context, port_id=port_id, host=host,
+                                 vif_type=portbindings.VIF_TYPE_OVS).create()
 
     def test_trunk_create(self):
         with self.trunk() as trunk:
@@ -158,21 +148,6 @@ def test_subport_add(self):
                 self._verify_trunk_info(new_trunk, has_items=True,
                                         host='host1')
 
-    def test_subport_add_live_migration_multiple_port_binding(self):
-        with self.subport() as subport:
-            with self.trunk() as trunk:
-                self.trunk_plugin.add_subports(self.context, trunk['id'],
-                                               {'sub_ports': [subport]})
-                new_trunk = self.trunk_plugin.get_trunk(self.context,
-                                                        trunk['id'])
-                self._verify_trunk_info(new_trunk, has_items=True)
-                # Bind parent port. That will trigger the binding of the
-                # trunk subports too, using the same host ID.
-                self._bind_port(trunk['port_id'], 'host1', host_dest='host2')
-                self.mech_driver.set_port_status_up(trunk['port_id'])
-                self._verify_trunk_info(new_trunk, has_items=True,
-                                        host='host2')
-
     def test_subport_delete(self):
         with self.subport() as subport:
             with self.trunk([subport]) as trunk: