ovs mech: bind only if user request switchdev

In I77650be5f04775a72e2bdf694f93988825a84b72 we added
vnic_type direct to the ovs mechanism drivers supported
vnic_types. This cause problems when working with ovs and sriovnicswitch
mechanism drivers in that order.  In this case the ovs will bind
the direct port instead of the sriovnicswitch.

This change make ovs mech driver to bind the direct port only
if user requested --binding-profile '{"capabilities": ["switchdev"]}'
in the direct port if a user don't request this capability the SR-IOV
legacy NIC mode is used.

When enable-sriov-nic-features will be implemented in nova and
libvirt will expose the switchdev capability then nova will be
able to select a host which supports SR-IOV nic with switchdev
mode.

[1] - https://review.openstack.org/#/c/435954/11/specs/pike/approved/enable-sriov-nic-features.rst
[2] - https://www.redhat.com/archives/libvir-list/2017-August/msg00583.html

Closes-Bug: #1713590

Change-Id: I0b5f062bcbf02381bdf4f694fc039f9bb17a2db5
(cherry picked from commit b184558ab6)

neutron/plugins/ml2/drivers/mech_sriov/mech_driver/mech_driver.py

@@ -76,8 +76,17 @@ class SriovNicSwitchMechanismDriver(mech_agent.SimpleAgentMechanismDriverBase):
                   "network %(network)s",
                   {'port': context.current['id'],
                    'network': context.network.current['id']})
+        profile = context.current.get(portbindings.PROFILE)
         vnic_type = context.current.get(portbindings.VNIC_TYPE,
                                         portbindings.VNIC_NORMAL)
+        capabilities = []
+        if profile:
+            capabilities = profile.get('capabilities', [])
+        if (vnic_type == portbindings.VNIC_DIRECT and
+            'switchdev' in capabilities):
+            LOG.debug("Refusing to bind due to unsupported vnic_type: %s "
+                      "with switchdev capability", portbindings.VNIC_DIRECT)
+            return
         if vnic_type not in self.supported_vnic_types:
             LOG.debug("Refusing to bind due to unsupported vnic_type: %s",
                       vnic_type)

neutron/plugins/ml2/drivers/openvswitch/mech_driver/mech_openvswitch.py

@@ -20,6 +20,7 @@ from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
 from neutron_lib import constants
 from oslo_config import cfg
+from oslo_log import log
 
 from neutron.agent import securitygroups_rpc
 from neutron.plugins.common import constants as p_constants
@@ -28,6 +29,7 @@ from neutron.plugins.ml2.drivers.openvswitch.agent.common \
     import constants as a_const
 from neutron.services.qos.drivers.openvswitch import driver as ovs_qos_driver
 
+LOG = log.getLogger(__name__)
 
 IPTABLES_FW_DRIVER_FULL = ("neutron.agent.linux.iptables_firewall."
                            "OVSHybridIptablesFirewallDriver")
@@ -74,6 +76,20 @@ class OpenvswitchMechanismDriver(mech_agent.SimpleAgentMechanismDriverBase):
         """Currently Openvswitch driver doesn't support vlan transparency."""
         return False
 
+    def bind_port(self, context):
+        vnic_type = context.current.get(portbindings.VNIC_TYPE,
+                                        portbindings.VNIC_NORMAL)
+        profile = context.current.get(portbindings.PROFILE)
+        capabilities = []
+        if profile:
+            capabilities = profile.get('capabilities', [])
+        if (vnic_type == portbindings.VNIC_DIRECT and
+            'switchdev' not in capabilities):
+            LOG.debug("Refusing to bind due to unsupported vnic_type: %s with "
+                      "no switchdev capability", portbindings.VNIC_DIRECT)
+            return
+        super(OpenvswitchMechanismDriver, self).bind_port(context)
+
     def get_vif_type(self, context, agent, segment):
         caps = agent['configurations'].get('ovs_capabilities', {})
         if (any(x in caps.get('iface_types', []) for x

neutron/tests/unit/plugins/ml2/_test_mech_agent.py

@@ -43,11 +43,12 @@ class FakeNetworkContext(api.NetworkContext):
 class FakePortContext(api.PortContext):
     def __init__(self, agent_type, agents, segments,
                  vnic_type=portbindings.VNIC_NORMAL,
-                 original=None):
+                 original=None, profile=None):
         self._agent_type = agent_type
         self._agents = agents
         self._network_context = FakeNetworkContext(segments)
         self._bound_vnic_type = vnic_type
+        self._bound_profile = profile
         self._bound_segment_id = None
         self._bound_vif_type = None
         self._bound_vif_details = None
@@ -56,7 +57,8 @@ class FakePortContext(api.PortContext):
     @property
     def current(self):
         return {'id': PORT_ID,
-                portbindings.VNIC_TYPE: self._bound_vnic_type}
+                portbindings.VNIC_TYPE: self._bound_vnic_type,
+                portbindings.PROFILE: self._bound_profile}
 
     @property
     def original(self):

neutron/tests/unit/plugins/ml2/drivers/mech_sriov/mech_driver/test_mech_sriov_nic_switch.py

@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import mock
 from neutron_lib.api.definitions import portbindings
 from neutron_lib import constants
 from neutron_lib.plugins.ml2 import api
@@ -24,25 +25,16 @@ from neutron.plugins.ml2.drivers.mech_sriov.mech_driver \
 from neutron.plugins.ml2.drivers.mech_sriov.mech_driver import mech_driver
 from neutron.tests.unit.plugins.ml2 import _test_mech_agent as base
 
-MELLANOX_CONNECTX3_PCI_INFO = '15b3:1004'
-
 
 class TestFakePortContext(base.FakePortContext):
         def __init__(self, agent_type, agents, segments,
                      vnic_type=portbindings.VNIC_NORMAL,
-                     profile={'pci_vendor_info':
-                              MELLANOX_CONNECTX3_PCI_INFO}):
+                     profile=None):
             super(TestFakePortContext, self).__init__(agent_type,
                                                       agents,
                                                       segments,
-                                                      vnic_type)
-            self._bound_profile = profile
-
-        @property
-        def current(self):
-            return {'id': base.PORT_ID,
-                    portbindings.VNIC_TYPE: self._bound_vnic_type,
-                    portbindings.PROFILE: self._bound_profile}
+                                                      vnic_type=vnic_type,
+                                                      profile=profile)
 
         def set_binding(self, segment_id, vif_type, vif_details, state):
             self._bound_segment_id = segment_id
@@ -145,6 +137,18 @@ class SriovSwitchMechVnicTypeTestCase(SriovNicSwitchMechanismBaseTestCase):
         self._check_vif_type_for_vnic_type(portbindings.VNIC_DIRECT_PHYSICAL,
                                            portbindings.VIF_TYPE_HOSTDEV_PHY)
 
+    @mock.patch.object(mech_driver.SriovNicSwitchMechanismDriver,
+                       'try_to_bind_segment_for_agent')
+    def test_vnic_type_direct_with_switchdev_cap(self, mocked_bind_segment):
+        profile = {'capabilities': ['switchdev']}
+        context = TestFakePortContext(self.AGENT_TYPE,
+                                      self.AGENTS,
+                                      self.VLAN_SEGMENTS,
+                                      portbindings.VNIC_DIRECT,
+                                      profile)
+        self.driver.bind_port(context)
+        mocked_bind_segment.assert_not_called()
+
 
 class SriovSwitchMechVifDetailsTestCase(SriovNicSwitchMechanismBaseTestCase):
     VLAN_SEGMENTS = [{api.ID: 'vlan_segment_id',

neutron/tests/unit/plugins/ml2/drivers/openvswitch/mech_driver/test_mech_openvswitch.py

@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import mock
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
@@ -243,12 +244,23 @@ class OpenvswitchMechanismDPDKTestCase(OpenvswitchMechanismBaseTestCase):
 
 class OpenvswitchMechanismSRIOVTestCase(OpenvswitchMechanismBaseTestCase):
 
-    def _make_port_ctx(self, agents):
+    def _make_port_ctx(self, agents, profile=None):
         segments = [{api.ID: 'local_segment_id', api.NETWORK_TYPE: 'local'}]
         return base.FakePortContext(self.AGENT_TYPE, agents, segments,
-                                    vnic_type=portbindings.VNIC_DIRECT)
+                                    vnic_type=portbindings.VNIC_DIRECT,
+                                    profile=profile)
 
-    def test_get_vif_type(self):
+    @mock.patch('neutron.plugins.ml2.drivers.mech_agent.'
+                'SimpleAgentMechanismDriverBase.bind_port')
+    def test_bind_port_sriov_legacy(self, mocked_bind_port):
         context = self._make_port_ctx(self.AGENTS)
-        result = self.driver.get_vif_type(context, self.AGENTS[0], None)
-        self.assertEqual(self.VIF_TYPE, result)
+        self.driver.bind_port(context)
+        mocked_bind_port.assert_not_called()
+
+    @mock.patch('neutron.plugins.ml2.drivers.mech_agent.'
+                'SimpleAgentMechanismDriverBase.bind_port')
+    def test_bind_port_sriov_switchdev(self, mocked_bind_port):
+        profile = {'capabilities': ['switchdev']}
+        context = self._make_port_ctx(self.AGENTS, profile=profile)
+        self.driver.bind_port(context)
+        mocked_bind_port.assert_called()