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[Kyle Mestery <1295703@xxxxxxxxxxxxxxxxxx>]

As near as I can tell, this Neutron commit [1] modified the flow
building behavior to reject modifying flows with a priority set [2].
However, there was no UT added to detect this case. Further, the agent
code is clearly modifying flows with a priority set [3]. Thus, this
error is being triggered.

I have a patch which removes priority from flow modification in the
agent and all unit tests, and also adds a negative UT case to make sure
we catch this in the future.

[1] https://review.openstack.org/#/c/58533/
[2] https://github.com/openstack/neutron/blob/master/neutron/agent/linux/ovs_lib.py#L544
[3] https://github.com/openstack/neutron/blob/master/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py#L373

** Also affects: neutron
   Importance: Undecided
       Status: New

** Changed in: neutron
     Assignee: (unassigned) => Kyle Mestery (mestery)

** Changed in: neutron
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1295703

Title:
  ci-overcloud job failing "Error while processing VIF ports"

Status in OpenStack Neutron (virtual network service):
  New
Status in tripleo - openstack on openstack:
  New

Bug description:
  ci overcloud jobs started failing between 5 and 8 AM GMT

  
  Error from http://logs.openstack.org/73/79873/5/check-tripleo/check-tripleo-overcloud-precise/859d4d4/

  var/log/upstart/neutron-openvswitch-agent.log ( on contoller and 1
  compute)

  [-] Error while processing VIF ports
  Traceback (most recent call last): 
    File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 1230, in rpc_loop
      sync = self.process_network_ports(port_info)
    File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 1084, in process_network_ports
      devices_added_updated)
    File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 984, in treat_devices_added_or_updated
      details['admin_state_up'])
    File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 893, in treat_vif_port
      physical_network, segmentation_id)
    File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 593, in port_bound
      physical_network, segmentation_id)
    File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 459, in provision_local_vlan
      (segmentation_id, ofports))
    File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/agent/linux/ovs_lib.py", line 190, in mod_flow
      flow_str = _build_flow_expr_str(kwargs, 'mod')
    File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/agent/linux/ovs_lib.py", line 546, in _build_flow_expr_str
      raise exceptions.InvalidInput(error_message=msg)
  InvalidInput: Invalid input for operation: Cannot match priority on flow deletion or modification.
  2014-03-21 05:20:56.329 7601 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent

  
  merge times and traceback details seem to match up with
  https://review.openstack.org/#/c/58533/19

  currently I'm testing a revert to see if it fixes things

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