Enable hardware offload support

Enable PCI Passthrough Filter if neutron-api charm has enabled
support for hardware offloading.

Change-Id: I0ccb4366b03557b316da1507015112c7f378176e
Depends-On: I1f59012ad2d16af18ca310906f6c6b537bb7ec72

hooks/nova_cc_context.py

@@ -143,7 +143,9 @@ class NeutronAPIContext(ch_context.OSContextGenerator):
                     rdata.get('neutron-security-groups'),
                     'network_manager': 'neutron',
                 }
-                if rdata.get('enable-sriov', '').lower() == 'true':
+                if (rdata.get('enable-sriov', '').lower() == 'true' or
+                        rdata.get('enable-hardware-offload',
+                                  '').lower() == 'true'):
                     ctxt['additional_neutron_filters'] = 'PciPassthroughFilter'
                 # LP Bug#1805645
                 if rdata.get('dns-domain', ''):

unit_tests/test_nova_cc_contexts.py

@@ -501,6 +501,7 @@ class NovaComputeContextTests(CharmTestCase):
         self.related_units.return_value = ['neutron-api/0']
         settings = {'neutron-plugin': 'ovs',
                     'enable-sriov': 'False',
+                    'enable-hardware-offload': 'False',
                     'neutron-security-groups': 'yes',
                     'neutron-url': 'http://neutron:9696'}
 
@@ -523,6 +524,12 @@ class NovaComputeContextTests(CharmTestCase):
         ctxt = context.NeutronAPIContext()()
         self.assertEqual(ctxt, expected)
 
+        settings['enable-sriov'] = 'False'
+        settings['enable-hardware-offload'] = 'True'
+        expected['additional_neutron_filters'] = 'PciPassthroughFilter'
+        ctxt = context.NeutronAPIContext()()
+        self.assertEqual(ctxt, expected)
+
     def test_CinderContext(self):
         self.test_config.update({'cross-az-attach': False, })
         ctxt = context.CinderConfigContext()()