Add constant to identify OVN LB HM ports

OVN metadata and OVN LB HM port (used for health checks) are both
using network:distributed in the device_owner field. Some tasks
in Neutron search by that value, considering just one port will
exist per network with that value.

This patch adds a new constant to differentiate OVN metadata ports
from the OVN LB HM ones. The latter will use a device_owner
of ovn-lb-hm:distributed to be different but will still receive the
treatment of a localport in the OVN NB DB.

Related-Bug: 2038091
Change-Id: I70de163fad34371de10fec28c51959384900ebc8

neutron/common/ovn/constants.py

@@ -70,6 +70,10 @@ OVN_ROUTER_PORT_GW_MTU_OPTION = 'gateway_mtu'
 OVN_PROVNET_PORT_NAME_PREFIX = 'provnet-'
 OVN_NAME_PREFIX = 'neutron-'
 
+# TODO(froyo): Move this to neutron-lib as soon as possible, and when a new
+# release is created and pointed to in the requirements remove this code
+OVN_LB_HM_PORT_DISTRIBUTED = 'ovn-lb-hm:distributed'
+
 # Agent extension constants
 OVN_AGENT_DESC_KEY = 'neutron:description'
 OVN_AGENT_METADATA_SB_CFG_KEY = 'neutron:ovn-metadata-sb-cfg'

neutron/common/ovn/utils.py

@@ -608,6 +608,11 @@ def is_ovn_metadata_port(port):
             port['device_id'].startswith('ovnmeta'))
 
 
+def is_ovn_lb_hm_port(port):
+    return (port['device_owner'] == constants.OVN_LB_HM_PORT_DISTRIBUTED and
+            port['device_id'].startswith('ovn-lb-hm'))
+
+
 def is_gateway_chassis_invalid(chassis_name, gw_chassis,
                                physnet, chassis_physnets,
                                az_hints, chassis_with_azs):

neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/impl_idl_ovn.py

@@ -15,6 +15,7 @@ import functools
 import socket
 import uuid
 
+from neutron_lib import constants
 from neutron_lib import exceptions as n_exc
 from neutron_lib.utils import helpers
 from oslo_log import log
@@ -929,7 +930,10 @@ class OvsdbSbOvnIdl(sb_impl_idl.OvnSbApiIdlImpl, Backend):
         except idlutils.RowNotFound:
             return None
         cmd = self.db_find_rows('Port_Binding', ('datapath', '=', dp),
-                                ('type', '=', ovn_const.LSP_TYPE_LOCALPORT))
+                                ('type', '=', ovn_const.LSP_TYPE_LOCALPORT),
+                                ('external_ids', '=', {
+                                    ovn_const.OVN_DEVICE_OWNER_EXT_ID_KEY:
+                                        constants.DEVICE_OWNER_DISTRIBUTED}))
         return next(iter(cmd.execute(check_error=True)), None)
 
     def set_chassis_neutron_description(self, chassis, description,

neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py

@@ -379,8 +379,9 @@ class OVNClient(object):
                     cidrs += ' {}/{}'.format(ip['ip_address'],
                                              subnet['cidr'].split('/')[1])
 
-            # Metadata port.
-            if utils.is_ovn_metadata_port(port):
+            # Metadata or OVN LB HM port.
+            if (utils.is_ovn_metadata_port(port) or
+                    utils.is_ovn_lb_hm_port(port)):
                 port_type = ovn_const.LSP_TYPE_LOCALPORT
 
             if utils.is_port_external(port):

neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py

@@ -16,6 +16,7 @@
 import re
 from unittest import mock
 
+from neutron_lib import constants
 from oslo_config import fixture as fixture_config
 from oslo_utils import uuidutils
 from ovsdbapp.backend.ovs_idl import event
@@ -154,7 +155,9 @@ class TestMetadataAgent(base.TestOVNFunctionalBase):
                 addresses='AA:AA:AA:AA:AA:AA 192.168.122.123',
                 external_ids={
                     ovn_const.OVN_CIDRS_EXT_ID_KEY: '192.168.122.123/24',
-                    ovn_const.OVN_DEVID_EXT_ID_KEY: 'ovnmeta-' + lswitch_name
+                    ovn_const.OVN_DEVID_EXT_ID_KEY: 'ovnmeta-' + lswitch_name,
+                    ovn_const.OVN_DEVICE_OWNER_EXT_ID_KEY:
+                        constants.DEVICE_OWNER_DISTRIBUTED
                 }))
 
     def _update_metadata_port_ip(self, metadata_port_name):

neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl.py

@@ -15,6 +15,7 @@
 import copy
 import uuid
 
+from neutron_lib import constants
 from oslo_utils import uuidutils
 from ovsdbapp.backend.ovs_idl import connection
 from ovsdbapp import constants as const
@@ -104,34 +105,62 @@ class TestSbApi(BaseOvnIdlTest):
         self.load_test_data()
         self.assertRaises(ValueError, self.api.get_chassis_and_physnets)
 
-    def _add_switch_port(self, chassis_name,
-                         type=ovn_const.LSP_TYPE_LOCALPORT):
-        sname, pname = (utils.get_rand_device_name(prefix=p)
-                        for p in ('switch', 'port'))
+    def _add_switch(self, chassis_name):
+        sname = utils.get_rand_device_name(prefix='switch')
         chassis = self.api.lookup('Chassis', chassis_name)
+        with self.nbapi.transaction(check_error=True) as txn:
+            switch = txn.add(self.nbapi.ls_add(sname))
+        return chassis, switch.result
+
+    def _add_port_to_switch(
+            self, switch, type=ovn_const.LSP_TYPE_LOCALPORT,
+            device_owner=constants.DEVICE_OWNER_DISTRIBUTED):
+        pname = utils.get_rand_device_name(prefix='port')
         row_event = events.WaitForCreatePortBindingEvent(pname)
         self.handler.watch_event(row_event)
         with self.nbapi.transaction(check_error=True) as txn:
-            switch = txn.add(self.nbapi.ls_add(sname))
-            port = txn.add(self.nbapi.lsp_add(sname, pname, type=type))
+            port = txn.add(self.nbapi.lsp_add(
+                switch.uuid, pname, type=type,
+                external_ids={
+                    ovn_const.OVN_DEVICE_OWNER_EXT_ID_KEY: device_owner}))
         row_event.wait()
-        return chassis, switch.result, port.result, row_event.row
+        return port.result, row_event.row
 
     def test_get_metadata_port_network(self):
-        chassis, switch, port, binding = self._add_switch_port(
-            self.data['chassis'][0]['name'])
+        chassis, switch = self._add_switch(self.data['chassis'][0]['name'])
+        port, binding = self._add_port_to_switch(switch)
         result = self.api.get_metadata_port_network(str(binding.datapath.uuid))
         self.assertEqual(binding, result)
         self.assertEqual(binding.datapath.external_ids['logical-switch'],
                          str(switch.uuid))
+        self.assertEqual(
+            port.external_ids[ovn_const.OVN_DEVICE_OWNER_EXT_ID_KEY],
+            constants.DEVICE_OWNER_DISTRIBUTED)
+
+    def test_get_metadata_port_network_other_non_metadata_port(self):
+        chassis, switch = self._add_switch(self.data['chassis'][0]['name'])
+        port, binding = self._add_port_to_switch(switch)
+        port_lbhm, binding_port_lbhm = self._add_port_to_switch(
+            switch, device_owner=ovn_const.OVN_LB_HM_PORT_DISTRIBUTED)
+        result = self.api.get_metadata_port_network(str(binding.datapath.uuid))
+        self.assertEqual(binding, result)
+        self.assertEqual(binding.datapath.external_ids['logical-switch'],
+                         str(switch.uuid))
+        self.assertEqual(
+            binding_port_lbhm.datapath.external_ids['logical-switch'],
+            str(switch.uuid))
+        self.assertEqual(
+            port_lbhm.external_ids[ovn_const.OVN_DEVICE_OWNER_EXT_ID_KEY],
+            ovn_const.OVN_LB_HM_PORT_DISTRIBUTED)
 
     def test_get_metadata_port_network_missing(self):
         val = str(uuid.uuid4())
         self.assertIsNone(self.api.get_metadata_port_network(val))
 
     def _create_bound_port_with_ip(self):
-        chassis, switch, port, binding = self._add_switch_port(
+        chassis, switch = self._add_switch(
             self.data['chassis'][0]['name'])
+        port, binding = self._add_port_to_switch(switch)
         mac = 'de:ad:be:ef:4d:ad'
         ipaddr = '192.0.2.1'
         mac_ip = '%s %s' % (mac, ipaddr)
@@ -165,8 +194,9 @@ class TestSbApi(BaseOvnIdlTest):
         self.assertEqual(1, len(result))
 
     def test_get_ports_on_chassis(self):
-        chassis, switch, port, binding = self._add_switch_port(
+        chassis, switch = self._add_switch(
             self.data['chassis'][0]['name'])
+        port, binding = self._add_port_to_switch(switch)
         self.api.lsp_bind(port.name, chassis.name).execute(check_error=True)
         self.assertEqual([binding],
                          self.api.get_ports_on_chassis(chassis.name))

neutron/tests/unit/common/ovn/test_utils.py

@@ -217,6 +217,21 @@ class TestUtils(base.BaseTestCase):
         self.assertFalse(utils.is_ovn_metadata_port(non_meta_port_0))
         self.assertFalse(utils.is_ovn_metadata_port(non_meta_port_1))
 
+    def test_is_ovn_lb_hm_port(self):
+        ovn_lb_hm_port = {
+            'device_owner': constants.OVN_LB_HM_PORT_DISTRIBUTED,
+            'device_id': 'ovn-lb-hm-12345'}
+        non_ovn_lb_hm_port_0 = {
+            'device_owner': n_const.DEVICE_OWNER_DISTRIBUTED,
+            'device_id': 'ovnmeta-12345'}
+        non_ovn_lb_hm_port_1 = {
+            'device_owner': n_const.DEVICE_OWNER_DHCP,
+            'device_id': 'dhcp-12345'}
+
+        self.assertTrue(utils.is_ovn_lb_hm_port(ovn_lb_hm_port))
+        self.assertFalse(utils.is_ovn_lb_hm_port(non_ovn_lb_hm_port_0))
+        self.assertFalse(utils.is_ovn_lb_hm_port(non_ovn_lb_hm_port_1))
+
 
 class TestGateWayChassisValidity(base.BaseTestCase):
 

neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py

@@ -1913,6 +1913,22 @@ class TestOVNMechanismDriver(TestOVNMechanismDriverBase):
             self.assertEqual("address_scope_v4", options.address4_scope_id)
             self.assertEqual("address_scope_v6", options.address6_scope_id)
 
+    def test__get_port_options_with_ovn_lb_hm_port(self):
+        port = {
+            'id': 'ovn-lb-hm-port',
+            'mac_address': '00:00:00:00:00:00',
+            'device_owner': ovn_const.OVN_LB_HM_PORT_DISTRIBUTED,
+            'device_id': 'ovn-lb-hm-foo',
+            'network_id': 'foo',
+            'fixed_ips': [],
+            portbindings.HOST_ID: 'fake-src',
+            portbindings.PROFILE: {
+                ovn_const.MIGRATING_ATTR: 'fake-dest',
+            }
+        }
+        options = self.mech_driver._ovn_client._get_port_options(port)
+        self.assertEqual('fake-src', options.options['requested-chassis'])
+
     def test__get_port_options_migrating_additional_chassis_missing(self):
         port = {
             'id': 'virt-port',

releasenotes/notes/new-device-owner-for-ovn-lb-hm-ports-f5a648c4d948c5c8.yaml

@@ -0,0 +1,9 @@
+---
+other:
+  - |
+    The new value for 'device_owner' for OVN loadbalancer health monitor ports
+    (ovn-lb-hm:distributed) is now supported by Neutron, providing a LOCALPORT
+    behavior to these ports. The responsibility to define these ports with the
+    new value instead of the old one (network:distributed) is under the
+    OVN-Octavia Provider driver, which will take care of database conversion
+    for these ports.