fixed_configured=True when Add/Remove port IPs

When updating a port with the fixed_ips request the
fixed_configured argument should be set to true when
calling _ipam_get_subnets() so that all subnets are
returned if host is not set.

Otherwise the ip allocation will be deffered and an
empty list of possible subnets for the port is
returned. Which in turn led to raising an error that
the network requires subnets to allocate an IP
address.

Closes-Bug: #1844124
Change-Id: I2e690ea0cf5fa0614e39be2b0e83afad3daa7f48
(cherry picked from commit def8e95aad)

neutron/db/ipam_pluggable_backend.py

@@ -345,7 +345,7 @@ class IpamPluggableBackend(ipam_backend_mixin.IpamBackendMixin):
         try:
             subnets = self._ipam_get_subnets(
                 context, network_id=port['network_id'], host=host,
-                service_type=port.get('device_owner'))
+                service_type=port.get('device_owner'), fixed_configured=True)
         except ipam_exc.DeferIpam:
             subnets = []
 

neutron/tests/unit/db/test_ipam_pluggable_backend.py

@@ -688,8 +688,8 @@ class TestDbBasePluginIpam(test_db_base.NeutronDbPluginV2TestCase):
                                            original_ips, new_ips, mac)
         mocks['driver'].get_address_request_factory.assert_called_once_with()
         mocks['ipam']._ipam_get_subnets.assert_called_once_with(
-            context, network_id=port_dict['network_id'], host=None,
-            service_type=port_dict['device_owner'])
+            context, network_id=port_dict['network_id'], fixed_configured=True,
+            host=None, service_type=port_dict['device_owner'])
         # Validate port_dict is passed into address_factory
         address_factory.get_request.assert_called_once_with(context,
                                                             port_dict,

neutron/tests/unit/extensions/test_segment.py

@@ -1175,8 +1175,8 @@ class TestSegmentAwareIpam(SegmentAwareIpamTestCase):
         self.assertEqual(segment_exc.HostConnectedToMultipleSegments.__name__,
                          res['NeutronError']['type'])
 
-    def test_port_update_excludes_hosts_on_segments(self):
-        """No binding information is provided, subnets on segments"""
+    def test_port_update_with_fixed_ips_ok_if_no_binding_host(self):
+        """No binding host information is provided, subnets on segments"""
         with self.network() as network:
             segment = self._test_create_segment(
                 network_id=network['network']['id'],
@@ -1196,7 +1196,33 @@ class TestSegmentAwareIpam(SegmentAwareIpamTestCase):
             port_req = self.new_update_request('ports', data, port_id)
             response = port_req.get_response(self.api)
 
-        # Gets bad request because there are no eligible subnets.
+        # The IP is allocated since there is no binding host info any
+        # subnet can be used for allocation.
+        self.assertEqual(webob.exc.HTTPOk.code, response.status_int)
+
+    def test_port_update_with_fixed_ips_fail_if_host_not_on_segment(self):
+        """Binding information is provided, subnets on segments. Update to
+        subnet on different segment fails.
+        """
+        network, segments, subnets = self._create_test_segments_with_subnets(2)
+
+        # Setup host mappings
+        self._setup_host_mappings([(segments[0]['segment']['id'], 'fakehost')])
+
+        # Create a port and validate immediate ip allocation
+        res = self._create_port_and_show(network,
+                                         arg_list=(portbindings.HOST_ID,),
+                                         **{portbindings.HOST_ID: 'fakehost'})
+        self._validate_immediate_ip_allocation(res['port']['id'])
+
+        # Try requesting an new IP, but the subnet does not match host segment
+        port_id = res['port']['id']
+        data = {'port': {
+            'fixed_ips': [{'subnet_id': subnets[1]['subnet']['id']}]}}
+        port_req = self.new_update_request('ports', data, port_id)
+        response = port_req.get_response(self.api)
+
+        # Port update fails.
         self.assertEqual(webob.exc.HTTPBadRequest.code, response.status_int)
 
     def _create_port_and_show(self, network, **kwargs):

releasenotes/notes/fix-update-port-fixed-ips-on-routed-provider-networks-c54a54844d9a3926.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    When updating the fixed-ips of a port residing on a routed provider
+    network the port update would always fail if *host* was not set.
+    See bug: `1844124 <https://bugs.launchpad.net/tripleo/+bug/1844124>`_.
+