Handle creation of Port_Binding with chassis set

When there is a backlog of notifications to be sent, it is possible
that ovsdb-server will merge insert and update notifications. Due
to this, we need to handle the situation where we see a Port_Binding
created with the chassis set.

Closes-Bug: #2017748

Change-Id: Idfae87cf6c60e9e18ede91ea20857cea5322738c
(cherry picked from commit a641e8aec0)

neutron/agent/ovn/extensions/qos_hwol.py

@@ -158,13 +158,13 @@ class PortBindingChassisCreatedEvent(_PortBindingChassisEvent):
     LOG_MSG = 'Port ID %s, datapath %s, OVS port name: %s (event: %s)'
 
     def __init__(self, ovn_agent):
-        events = (self.ROW_UPDATE,)
+        events = (self.ROW_CREATE, self.ROW_UPDATE,)
         super().__init__(ovn_agent, events)
 
     def match_fn(self, event, row, old):
         try:
             return (row.chassis[0].name == self.ovn_agent.chassis and
-                    not old.chassis)
+                    (event == self.ROW_CREATE or not old.chassis))
         except (IndexError, AttributeError):
             return False
 

neutron/agent/ovn/metadata/agent.py

@@ -109,6 +109,16 @@ class PortBindingEvent(row_event.RowEvent):
             self.agent.resync()
 
 
+class PortBindingCreateWithChassis(PortBindingEvent):
+    EVENT = PortBindingEvent.ROW_CREATE
+
+    def match_fn(self, event, row, old):
+        self._log_msg = "Port %s in datapath %s bound to our chassis on insert"
+        if not (super().match_fn(event, row, old) and row.chassis):
+            return False
+        return row.chassis[0].name == self.agent.chassis
+
+
 class PortBindingUpdatedEvent(PortBindingEvent):
     EVENT = PortBindingEvent.ROW_UPDATE
 
@@ -316,6 +326,7 @@ class MetadataAgent(object):
         tables = ('Encap', 'Port_Binding', 'Datapath_Binding', 'SB_Global',
                   'Chassis')
         events = (PortBindingUpdatedEvent(self),
+                  PortBindingCreateWithChassis(self),
                   PortBindingDeletedEvent(self),
                   SbGlobalUpdateEvent(self),
                   )
@@ -345,7 +356,8 @@ class MetadataAgent(object):
         self._proxy.run()
 
         # Do the initial sync.
-        self.sync()
+        # Provisioning handled by PortBindingCreateWithChassis
+        self.sync(provision=False)
 
         # Register the agent with its corresponding Chassis
         self.register_metadata_agent()
@@ -396,7 +408,7 @@ class MetadataAgent(object):
         return set(p.datapath for p in self._vif_ports(ports))
 
     @_sync_lock
-    def sync(self):
+    def sync(self, provision=True):
         """Agent sync.
 
         This function will make sure that all networks with ports in our
@@ -423,8 +435,9 @@ class MetadataAgent(object):
         # resync all network namespaces based on the associated datapaths,
         # even those that are already running. This is to make sure
         # everything within each namespace is up to date.
-        for datapath in net_datapaths:
-            self.provision_datapath(datapath)
+        if provision:
+            for datapath in net_datapaths:
+                self.provision_datapath(datapath)
 
     @staticmethod
     def _get_veth_name(datapath):