Enable QoS minimum packet rate rule for OVS backend

This patch does *not* implement dataplane enforcement.

QoS minimum packet rate rule is enabled in OVS backend driver and
create/delete/update empty methods are added to enable placement
enforcement.

Partial-Bug: #1922237
See-Also: https://review.opendev.org/785236
Change-Id: Ie283ad3a4ec433c88ac23f798908cd143159394b

doc/source/admin/config-qos.rst

@@ -84,12 +84,20 @@ traffic directions (from the VM point of view).
 
 .. table:: **Neutron backends, supported directions and enforcement types for Minimum Packet Rate rule**
 
-    ============================  ====================  ====================  ==============  =====
-     Enforcement type \ Backend    Open vSwitch          SR-IOV                Linux Bridge    OVN
-    ============================  ====================  ====================  ==============  =====
-     Dataplane                     -                     -                    -               -
-     Placement                     -                     -                    -               -
-    ============================  ====================  ====================  ==============  =====
+    ============================  ==========================  ====================  ==============  =====
+     Enforcement type \ Backend    Open vSwitch                SR-IOV                Linux Bridge    OVN
+    ============================  ==========================  ====================  ==============  =====
+     Dataplane                     -                           -                     -               -
+     Placement                     Any(1)/Egress/Ingress (2)   -                     -               -
+    ============================  ==========================  ====================  ==============  =====
+
+.. note::
+
+    (1) Minimum packet rate rule supports ``any`` direction that can be used
+        with non-hardware-offloaded OVS deployments, where packets processed
+        from both ingress and egress directions are handled by the same set of
+        CPU cores.
+    (2) Since Yoga.
 
 For an ml2 plug-in, the list of supported QoS rule types and parameters is
 defined as a common subset of rules supported by all active mechanism drivers.

neutron/plugins/ml2/drivers/openvswitch/agent/extension_drivers/qos_driver.py

@@ -214,3 +214,22 @@ class QosOVSAgentDriver(qos.QosLinuxAgentDriver):
             return
         LOG.debug("Minimum bandwidth rule for ingress direction was deleted "
                   "for port %s", port['port_id'])
+
+    # NOTE(przszc): Even though dataplane enforcement is not yet implemented
+    # for minimum packet rate rule, we need dummy methods to support placement
+    # enforcement.
+    def create_minimum_packet_rate(self, port, rule):
+        LOG.debug("Minimum packet rate rule was created for port %s and "
+                  "rule %s.", port['port_id'], rule.id)
+
+    def update_minimum_packet_rate(self, port, rule):
+        LOG.debug("Minimum packet rate rule was updated for port %s and "
+                  "rule %s.", port['port_id'], rule.id)
+
+    def delete_minimum_packet_rate(self, port):
+        LOG.debug("Minimum packet rate rule was deleted for port %s",
+                  port['port_id'])
+
+    def delete_minimum_packet_rate_ingress(self, port):
+        LOG.debug("Minimum packet rate rule for ingress direction was deleted "
+                  "for port %s", port['port_id'])

neutron/services/qos/drivers/openvswitch/driver.py

@@ -21,6 +21,7 @@ from neutron_lib.services.qos import constants as qos_consts
 from oslo_log import log as logging
 
 from neutron.objects import network as network_object
+from neutron.services.qos import constants as neutron_qos_consts
 
 
 LOG = logging.getLogger(__name__)
@@ -43,7 +44,13 @@ SUPPORTED_RULES = {
         qos_consts.MIN_KBPS: {
             'type:range': [0, db_consts.DB_INTEGER_MAX_VALUE]},
         qos_consts.DIRECTION: {'type:values': constants.VALID_DIRECTIONS}
-    }
+    },
+    neutron_qos_consts.RULE_TYPE_MINIMUM_PACKET_RATE: {
+        qos_consts.MIN_KPPS: {
+            'type:range': [0, db_consts.DB_INTEGER_MAX_VALUE]},
+        qos_consts.DIRECTION: {
+            'type:values': constants.VALID_DIRECTIONS_AND_ANY},
+    },
 }
 
 

neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/extension_drivers/test_qos_driver.py

@@ -260,3 +260,35 @@ class QosOVSAgentDriverTestCase(ovs_test_base.OVSAgentConfigTestBase):
             self.qos_driver.update_minimum_bandwidth(port, rule)
             mock_delete_minimum_bandwidth_queue.assert_called_once_with(
                 'port_id', ['port1', 'port2'], 'ofport', 1500)
+
+    # TODO(przszc): Update tests when dataplane enforcement is implemented for
+    # minimum packet rate rule
+    def test_create_minimum_packet_rate(self):
+        try:
+            port = {'port_id': 'p_id'}
+            rule = mock.MagicMock(id='rule_id')
+            self.qos_driver.create_minimum_packet_rate(port, rule)
+        except Exception:
+            self.fail('create_minimum_packet_rate failed')
+
+    def test_update_minimum_packet_rate(self):
+        try:
+            port = {'port_id': 'p_id'}
+            rule = mock.MagicMock(id='rule_id')
+            self.qos_driver.update_minimum_packet_rate(port, rule)
+        except Exception:
+            self.fail('update_minimum_packet_rate failed')
+
+    def test_delete_minimum_packet_rate(self):
+        try:
+            port = {'port_id': 'p_id'}
+            self.qos_driver.delete_minimum_packet_rate(port)
+        except Exception:
+            self.fail('delete_minimum_packet_rate failed')
+
+    def test_delete_minimum_packet_rate_ingress(self):
+        try:
+            port = {'port_id': 'p_id'}
+            self.qos_driver.delete_minimum_packet_rate_ingress(port)
+        except Exception:
+            self.fail('delete_minimum_packet_rate_ingress failed')

releasenotes/notes/qos_min_pps_rule_ovs-3fe3d73227980c53.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Enabled placement enforcement for QoS minimum packet rate rule in OVS
+    backend.