From 8d1512afb07a9a77958c44f2e7f5d47865c8a475 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Maciej=20J=C3=B3zefczyk?= Date: Thu, 16 Apr 2020 12:58:15 +0000 Subject: [PATCH] [OVN] Allow IP allocation with different segments for OVN service ports OVN creates localport [1] for each network that has metadata and allocate IP address from subnet within this network that has DHCP enabled. The traffic from this port will never go outside the chassis. While using multiple segments with subnet linked to each segment OVN needs to create an allocation of IP address for each of those subnets [2] in order to generate data for OVN NBDB IPv4 DHCP Options. The change [3] started to validate that condition, while multiple IP addresses from different segments are tried to be allocated on one port. We can skip this for OVN Metadata port, because there is no reason to prevent those kind of allocation for OVN. [1] http://www.openvswitch.org/support/dist-docs/ovn-architecture.7.html [2] https://github.com/openstack/neutron/blob/5f42488a9a6a7a3afa55a56f53e2f5ef09365115/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py#L2279 [3] https://review.opendev.org/#/c/709444/ Change-Id: Ib51cde89ed873f48db4daebc27a0980da9cc0f19 Closes-Bug: 1871608 --- doc/source/admin/config-routed-networks.rst | 5 +- doc/source/admin/intro-os-networking.rst | 3 + neutron/db/ipam_backend_mixin.py | 12 +- neutron/db/ipam_pluggable_backend.py | 17 +-- neutron/objects/subnet.py | 14 ++- .../tests/unit/db/test_ipam_backend_mixin.py | 15 +++ .../unit/db/test_ipam_pluggable_backend.py | 38 +++++- .../ovn/mech_driver/test_mech_driver.py | 110 ++++++++++++++++++ 8 files changed, 198 insertions(+), 16 deletions(-) diff --git a/doc/source/admin/config-routed-networks.rst b/doc/source/admin/config-routed-networks.rst index 0a37c0e36ad..8c78d9a9ea2 100644 --- a/doc/source/admin/config-routed-networks.rst +++ b/doc/source/admin/config-routed-networks.rst @@ -27,7 +27,10 @@ A routed provider network enables a single provider network to represent multiple layer-2 networks (broadcast domains) or segments and enables the operator to present one network to users. However, the particular IP addresses available to an instance depend on the segment of the network -available on the particular compute node. +available on the particular compute node. Neutron port could be associated +with only one network segment, but there is an exception for OVN distributed +services like OVN Metadata. + Similar to conventional networking, layer-2 (switching) handles transit of traffic between ports on the same segment and layer-3 (routing) handles diff --git a/doc/source/admin/intro-os-networking.rst b/doc/source/admin/intro-os-networking.rst index 89ae795e293..9b13d55d5ea 100644 --- a/doc/source/admin/intro-os-networking.rst +++ b/doc/source/admin/intro-os-networking.rst @@ -118,6 +118,9 @@ Routed provider networks offer performance at scale that is difficult to achieve with a plain provider network at the expense of guaranteed layer-2 connectivity. +Neutron port could be associated with only one network segment, +but there is an exception for OVN distributed services like OVN Metadata. + See :ref:`config-routed-provider-networks` for more information. .. _intro-os-networking-selfservice: diff --git a/neutron/db/ipam_backend_mixin.py b/neutron/db/ipam_backend_mixin.py index 102f54e053f..110fb52f566 100644 --- a/neutron/db/ipam_backend_mixin.py +++ b/neutron/db/ipam_backend_mixin.py @@ -81,6 +81,10 @@ class IpamBackendMixin(db_base_plugin_common.DbBasePluginCommon): raise exc.InvalidAllocationPool(pool=ip_pool) return ip_range_pools + @staticmethod + def _is_distributed_service(port): + return port.get('device_owner') == const.DEVICE_OWNER_DISTRIBUTED + def delete_subnet(self, context, subnet_id): pass @@ -647,7 +651,8 @@ class IpamBackendMixin(db_base_plugin_common.DbBasePluginCommon): return fixed_ip_list def _ipam_get_subnets(self, context, network_id, host, service_type=None, - fixed_configured=False, fixed_ips=None): + fixed_configured=False, fixed_ips=None, + distributed_service=False): """Return eligible subnets If no eligible subnets are found, determine why and potentially raise @@ -655,7 +660,7 @@ class IpamBackendMixin(db_base_plugin_common.DbBasePluginCommon): """ subnets = subnet_obj.Subnet.find_candidate_subnets( context, network_id, host, service_type, fixed_configured, - fixed_ips) + fixed_ips, distributed_service=distributed_service) if subnets: msg = ('This subnet is being modified by another concurrent ' 'operation') @@ -723,7 +728,8 @@ class IpamBackendMixin(db_base_plugin_common.DbBasePluginCommon): if old_ips and new_host_requested and not fixed_ips_requested: valid_subnets = self._ipam_get_subnets( context, old_port['network_id'], host, - service_type=old_port.get('device_owner')) + service_type=old_port.get('device_owner'), + distributed_service=self._is_distributed_service(old_port)) valid_subnet_ids = {s['id'] for s in valid_subnets} for fixed_ip in old_ips: if fixed_ip['subnet_id'] not in valid_subnet_ids: diff --git a/neutron/db/ipam_pluggable_backend.py b/neutron/db/ipam_pluggable_backend.py index b9cfcca2434..0bebc4802aa 100644 --- a/neutron/db/ipam_pluggable_backend.py +++ b/neutron/db/ipam_pluggable_backend.py @@ -231,12 +231,14 @@ class IpamPluggableBackend(ipam_backend_mixin.IpamBackendMixin): p = port['port'] fixed_configured = p['fixed_ips'] is not constants.ATTR_NOT_SPECIFIED fixed_ips = p['fixed_ips'] if fixed_configured else [] - subnets = self._ipam_get_subnets(context, - network_id=p['network_id'], - host=p.get(portbindings.HOST_ID), - service_type=p.get('device_owner'), - fixed_configured=fixed_configured, - fixed_ips=fixed_ips) + subnets = self._ipam_get_subnets( + context, + network_id=p['network_id'], + host=p.get(portbindings.HOST_ID), + service_type=p.get('device_owner'), + fixed_configured=fixed_configured, + fixed_ips=fixed_ips, + distributed_service=self._is_distributed_service(p)) v4, v6_stateful, v6_stateless = self._classify_subnets( context, subnets) @@ -349,7 +351,8 @@ class IpamPluggableBackend(ipam_backend_mixin.IpamBackendMixin): subnets = self._ipam_get_subnets( context, network_id=port['network_id'], host=host, service_type=port.get('device_owner'), fixed_configured=True, - fixed_ips=changes.add + changes.original) + fixed_ips=changes.add + changes.original, + distributed_service=self._is_distributed_service(port)) except ipam_exc.DeferIpam: subnets = [] diff --git a/neutron/objects/subnet.py b/neutron/objects/subnet.py index 3c492a6ff74..540c6e559e8 100644 --- a/neutron/objects/subnet.py +++ b/neutron/objects/subnet.py @@ -321,7 +321,8 @@ class Subnet(base.NeutronDbObject): @classmethod def find_candidate_subnets(cls, context, network_id, host, service_type, - fixed_configured, fixed_ips): + fixed_configured, fixed_ips, + distributed_service=False): """Find canditate subnets for the network, host, and service_type""" query = cls.query_subnets_on_network(context, network_id) query = SubnetServiceType.query_filter_service_subnets( @@ -335,7 +336,8 @@ class Subnet(base.NeutronDbObject): # on port update with binding:host_id set. Allocation _cannot_ # be deferred as requested fixed_ips would then be lost. return cls._query_filter_by_fixed_ips_segment( - query, fixed_ips).all() + query, fixed_ips, + allow_multiple_segments=distributed_service).all() # If the host isn't known, we can't allocate on a routed network. # So, exclude any subnets attached to segments. return cls._query_exclude_subnets_on_segments(query).all() @@ -357,7 +359,8 @@ class Subnet(base.NeutronDbObject): return [subnet for subnet, _mapping in results] @classmethod - def _query_filter_by_fixed_ips_segment(cls, query, fixed_ips): + def _query_filter_by_fixed_ips_segment(cls, query, fixed_ips, + allow_multiple_segments=False): """Excludes subnets not on the same segment as fixed_ips :raises: FixedIpsSubnetsNotOnSameSegment @@ -390,9 +393,12 @@ class Subnet(base.NeutronDbObject): if subnet and subnet.segment_id not in segment_ids: segment_ids.append(subnet.segment_id) - if 1 < len(segment_ids): + if 1 < len(segment_ids) and not allow_multiple_segments: raise segment_exc.FixedIpsSubnetsNotOnSameSegment() + if allow_multiple_segments: + return query + segment_id = None if not segment_ids else segment_ids[0] return query.filter(cls.db_model.segment_id == segment_id) diff --git a/neutron/tests/unit/db/test_ipam_backend_mixin.py b/neutron/tests/unit/db/test_ipam_backend_mixin.py index 1ea1c39f1f0..acf8c6fe1d6 100644 --- a/neutron/tests/unit/db/test_ipam_backend_mixin.py +++ b/neutron/tests/unit/db/test_ipam_backend_mixin.py @@ -87,6 +87,21 @@ class TestIpamBackendMixin(base.BaseTestCase): self.mixin._get_subnet_object = mock.Mock( side_effect=_get_subnet_object) + def test__is_distributed_service(self): + port = {'device_owner': + '%snova' % constants.DEVICE_OWNER_COMPUTE_PREFIX, + 'device_id': uuidutils.generate_uuid()} + self.assertFalse(self.mixin._is_distributed_service(port)) + port = {'device_owner': constants.DEVICE_OWNER_DHCP, + 'device_id': uuidutils.generate_uuid()} + self.assertFalse(self.mixin._is_distributed_service(port)) + port = {'device_owner': constants.DEVICE_OWNER_DHCP, + 'device_id': 'ovnmeta-%s' % uuidutils.generate_uuid()} + self.assertFalse(self.mixin._is_distributed_service(port)) + port = {'device_owner': constants.DEVICE_OWNER_DISTRIBUTED, + 'device_id': 'ovnmeta-%s' % uuidutils.generate_uuid()} + self.assertTrue(self.mixin._is_distributed_service(port)) + def _test_get_changed_ips_for_port(self, expected, original_ips, new_ips, owner): change = self.mixin._get_changed_ips_for_port(self.ctx, diff --git a/neutron/tests/unit/db/test_ipam_pluggable_backend.py b/neutron/tests/unit/db/test_ipam_pluggable_backend.py index b54d175d7c5..b3847646b7b 100644 --- a/neutron/tests/unit/db/test_ipam_pluggable_backend.py +++ b/neutron/tests/unit/db/test_ipam_pluggable_backend.py @@ -692,12 +692,48 @@ class TestDbBasePluginIpam(test_db_base.NeutronDbPluginV2TestCase): mocks['ipam']._ipam_get_subnets.assert_called_once_with( context, network_id=port_dict['network_id'], fixed_configured=True, fixed_ips=[ip_dict], host=None, - service_type=port_dict['device_owner']) + service_type=port_dict['device_owner'], + distributed_service=False) # Validate port_dict is passed into address_factory address_factory.get_request.assert_called_once_with(context, port_dict, ip_dict) + @mock.patch('neutron.ipam.driver.Pool') + def test_update_ips_for_port_ovn_distributed_svc(self, pool_mock): + address_factory = mock.Mock() + mocks = self._prepare_mocks_with_pool_mock( + pool_mock, address_factory=address_factory) + context = mock.Mock() + new_ips = mock.Mock() + original_ips = mock.Mock() + mac = mock.Mock() + + ip_dict = {'ip_address': '192.1.1.10', + 'subnet_id': uuidutils.generate_uuid()} + changes = ipam_pluggable_backend.IpamPluggableBackend.Changes( + add=[ip_dict], original=[], remove=[]) + changes_mock = mock.Mock(return_value=changes) + fixed_ips_mock = mock.Mock(return_value=changes.add) + mocks['ipam'] = ipam_pluggable_backend.IpamPluggableBackend() + mocks['ipam']._get_changed_ips_for_port = changes_mock + mocks['ipam']._ipam_get_subnets = mock.Mock(return_value=[]) + mocks['ipam']._test_fixed_ips_for_port = fixed_ips_mock + mocks['ipam']._update_ips_for_pd_subnet = mock.Mock(return_value=[]) + + port_dict = { + 'device_owner': constants.DEVICE_OWNER_DISTRIBUTED, + 'device_id': 'ovnmeta-%s' % uuidutils.generate_uuid(), + 'network_id': uuidutils.generate_uuid()} + + mocks['ipam']._update_ips_for_port(context, port_dict, None, + original_ips, new_ips, mac) + mocks['ipam']._ipam_get_subnets.assert_called_once_with( + context, network_id=port_dict['network_id'], fixed_configured=True, + fixed_ips=[ip_dict], host=None, + service_type=port_dict['device_owner'], + distributed_service=True) + @mock.patch('neutron.ipam.driver.Pool') def test_update_ips_for_port_passes_port_id_to_factory(self, pool_mock): port_id = uuidutils.generate_uuid() diff --git a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py index 9e69853e97c..8aaa71ac814 100644 --- a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py +++ b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py @@ -2047,6 +2047,116 @@ class TestOVNMechanismDriverSegment(test_segment.HostSegmentMappingTestCase): lport_name=ovn_utils.ovn_provnet_port_name(seg_2['id']), lswitch_name=ovn_utils.ovn_name(net['id'])) + def _test_segments_helper(self): + ovn_conf.cfg.CONF.set_override('ovn_metadata_enabled', True, + group='ovn') + + # Create first segment and associate subnet to it. + with self.network() as n: + self.net = n + self.seg_1 = self._test_create_segment( + network_id=self.net['network']['id'], physical_network='phys_net1', + segmentation_id=200, network_type='vlan')['segment'] + with self.subnet(network=self.net, cidr='10.0.1.0/24', + segment_id=self.seg_1['id']) as subnet: + self.sub_1 = subnet + + # Create second segment and subnet linked to it + self.seg_2 = self._test_create_segment( + network_id=self.net['network']['id'], physical_network='phys_net2', + segmentation_id=300, network_type='vlan')['segment'] + with self.subnet(network=self.net, cidr='10.0.2.0/24', + segment_id=self.seg_2['id']) as subnet: + self.sub_2 = subnet + + def test_create_segments_subnet_metadata_ip_allocation(self): + self._test_segments_helper() + ovn_nb_api = self.mech_driver._nb_ovn + + # Assert that metadata address has been allocated from previously + # created subnet. + self.assertIn( + '10.0.1.2', + ovn_nb_api.set_lswitch_port.call_args_list[0][1]['addresses'][0]) + + # Assert that the second subnet address also has been allocated for + # metadata port. + self.assertIn( + '10.0.2.2', + ovn_nb_api.set_lswitch_port.call_args_list[1][1]['addresses'][0]) + # Assert also that the first subnet address is in this update + self.assertIn( + '10.0.1.2', + ovn_nb_api.set_lswitch_port.call_args_list[1][1]['addresses'][0]) + self.assertEqual( + ovn_nb_api.set_lswitch_port.call_count, 2) + + # Make sure both updates where on same metadata port + args_list = ovn_nb_api.set_lswitch_port.call_args_list + self.assertEqual( + 'ovnmeta-%s' % self.net['network']['id'], + args_list[1][1]['external_ids']['neutron:device_id']) + self.assertEqual( + args_list[1][1]['external_ids']['neutron:device_id'], + args_list[0][1]['external_ids']['neutron:device_id']) + self.assertEqual( + args_list[1][1]['external_ids']['neutron:device_owner'], + args_list[0][1]['external_ids']['neutron:device_owner']) + self.assertEqual( + const.DEVICE_OWNER_DISTRIBUTED, + args_list[1][1]['external_ids']['neutron:device_owner']) + + def test_create_segments_mixed_allocation_prohibited(self): + self._test_segments_helper() + + # Try to create 'normal' port with ip address + # allocations from multiple segments + kwargs = {'fixed_ips': [{'ip_address': '10.0.1.100', + 'subnet_id': self.sub_1['subnet']['id']}, + {'ip_address': '10.0.2.100', + 'subnet_id': self.sub_2['subnet']['id']}]} + + # Make sure that this allocation is prohibited. + self._create_port( + self.fmt, self.net['network']['id'], + arg_list=('fixed_ips',), **kwargs, + expected_res_status=400) + + def test_create_delete_segment_distributed_service_port_not_touched(self): + self._test_segments_helper() + ovn_nb_api = self.mech_driver._nb_ovn + + # Delete second subnet + self._delete('subnets', self.sub_2['subnet']['id']) + # Make sure that shared metadata port wasn't deleted. + ovn_nb_api.delete_lswitch_port.assert_not_called() + + # Delete first subnet + self._delete('subnets', self.sub_1['subnet']['id']) + # Make sure that the metadata port wasn't deleted. + ovn_nb_api.delete_lswitch_port.assert_not_called() + + # Delete both segments + self._delete('segments', self.seg_2['id']) + self._delete('segments', self.seg_1['id']) + + # Make sure that the metadata port wasn't deleted. + deleted_ports = [ + port[1]['lport_name'] + for port in ovn_nb_api.delete_lswitch_port.call_args_list] + self.assertNotIn( + 'ovnmeta-%s' % self.net['network']['id'], + deleted_ports) + self.assertEqual( + 2, + ovn_nb_api.delete_lswitch_port.call_count) + + # Only on network deletion the metadata port is deleted. + self._delete('networks', self.net['network']['id']) + self.assertEqual( + 3, + ovn_nb_api.delete_lswitch_port.call_count) + @mock.patch.object(n_net, 'get_random_mac', lambda *_: '01:02:03:04:05:06') class TestOVNMechanismDriverDHCPOptions(OVNMechanismDriverTestCase):