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[OpenStack Infra <1840979@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: master
Review: https://review.opendev.org/678366

** Changed in: neutron
       Status: Opinion => In Progress

** Changed in: neutron
     Assignee: (unassigned) => LIU Yulong (dragon889)

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https://bugs.launchpad.net/bugs/1840979

Title:
  [L2] [opinion] update the port DB status directly in agent-side

Status in neutron:
  In Progress

Bug description:
  When ovs-agent done processing the port, it will call neutron-server to make some DB update.
  Especially when restart the ovs-agent, all ports in one agent will do such RPC and DB update again to make port status consistent. When a large number of concurrent agent restart happen, neutron-server may not work fine.
  So how about making the following DB updating locally in neutron agent side directly? It may have some mechanism driver notification, IMO, this can also be done in agent-side.

      def update_device_down(self, context, device, agent_id, host=None):
          cctxt = self.client.prepare()
          return cctxt.call(context, 'update_device_down', device=device,
                            agent_id=agent_id, host=host)

      def update_device_up(self, context, device, agent_id, host=None):
          cctxt = self.client.prepare()
          return cctxt.call(context, 'update_device_up', device=device,
                            agent_id=agent_id, host=host)

      def update_device_list(self, context, devices_up, devices_down,
      ret = cctxt.call(context, 'update_device_list',

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