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[Vishal Thapar <thapar@xxxxxxxxx>]

** Changed in: neutron
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1312023

Title:
  ovs_lib: apply order for deferred flows problematic for ovs-firewall-
  driver

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  ovs_lib.py provides defer_apply_on/off methods to bulk apply flow
  changes on a bridge. Currently the order in which flows get applied is
  add, mod, del. This causes problems for ovs-firewall-driver.
  update_port_filter() deletes all existing flows on a port and then
  adds new flows. But because of fixed order of deferred flows the
  addition of new flows is done first and then cleanup deleting all
  flows. This results in a scenario where update_port_filter ends up
  wiping out all flows.

  This is a big issue for ovs-firewall-driver. There should be a means
  to tweak the order in which flows will be applied when turning
  deferred_apply_on.

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