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[OpenStack Infra <1642223@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/415804
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=0af6e6ded04c994b788836906d94fe097b581a0b
Submitter: Jenkins
Branch:    master

commit 0af6e6ded04c994b788836906d94fe097b581a0b
Author: shihanzhang <ayshihanzhang@xxxxxxxxx>
Date:   Fri Dec 30 14:23:12 2016 +0800

    Change the order of installing flows for br-int
    
    For ovs-agent, it uses CANARY_TABLE table to check ovs status, when
    ovs-agent restarts, it should firstly install flows for CANARY_TABLE
    table.
    
    Closes-bug: #1642223
    Change-Id: I2aebbe5faca2fd4ec137255f0413cc2c129a4588


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1642223

Title:
  neutron-openvswitch-agent failed to add default table

Status in neutron:
  Fix Released

Bug description:
  Problem

  After power down and power off the host, the tenant network is not
  available.

  The cause is that default flow tables of br-int is not setup
  successfully when neutron-openvswitch-agent.starts:

      1) The neutron-openvswitch-agent fails to add the flow table 0 but
  adds the flow table 23 successfully in setup_default_table(). The
  flows look like as follows:

      cookie=0x8f4c30f934586d9c, duration=617166.781s, table=0, n_packets=31822416, n_bytes=2976996304, idle_age=0, hard_age=65534, priority=2,in_port=1 actions=drop
      cookie=0x8f4c30f934586d9c, duration=617167.023s, table=23, n_packets=0, n_bytes=0, idle_age=65534, hard_age=65534, priority=0 actions=drop
      cookie=0x8f4c30f934586d9c, duration=617167.007s, table=24, n_packets=0, n_bytes=0, idle_age=65534, hard_age=65534, priority=0 actions=drop

      2) In the rpc_roop, the neutron-openvswitch-agent will check the
  ovs status by checking the flow table 23, and the flow table 23
  exists. The neutron-openvswitch-agent thinks the ovs is normal, but
  the flow table 0 does not exist and the network connection is not
  availble.

  Affected Neutron version:
  Newton

  Possible Solution:
  Check the default table 0 or check all the default flow tables in check_ovs_status().
  Or add the default flow table 23 first and then add the default table 0 in setup_default_table()

  Thanks

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