[Bug 1852221] Please test proposed package

Corey Bryant 1852221 at bugs.launchpad.net
Tue Jun 23 14:36:23 UTC 2020


Hello Frode, or anyone else affected,

Accepted neutron into train-proposed. The package will build now and be
available in the Ubuntu Cloud Archive in a few hours, and then in the
-proposed repository.

Please help us by testing this new package. To enable the -proposed
repository:

  sudo add-apt-repository cloud-archive:train-proposed
  sudo apt-get update

Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-train-needed to verification-train-done. If it does
not fix the bug for you, please add a comment stating that, and change
the tag to verification-train-failed. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!

** Changed in: cloud-archive/train
       Status: Triaged => Fix Committed

** Tags added: verification-train-needed

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You received this bug notification because you are a member of Ubuntu
OpenStack, which is subscribed to openvswitch in Ubuntu.
https://bugs.launchpad.net/bugs/1852221

Title:
  ovs-vswitchd needs to be forced to reconfigure after adding protocols
  to bridges

Status in OpenStack neutron-openvswitch charm:
  Invalid
Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive train series:
  Fix Committed
Status in Ubuntu Cloud Archive ussuri series:
  Fix Released
Status in kolla-ansible:
  New
Status in neutron:
  New
Status in openvswitch:
  New
Status in neutron package in Ubuntu:
  New
Status in openvswitch package in Ubuntu:
  Confirmed
Status in neutron source package in Eoan:
  Fix Committed
Status in neutron source package in Focal:
  Fix Released

Bug description:
  [Impact]
  When the neutron native ovs driver creates bridges it will sometimes apply/modify the supported openflow protocols on that bridge. The OpenVswitch versions shipped with Train and Ussuri don't support this which results in OF protocol mismatches when neutron performs operations on that bridge. The patch we are backporting here ensures that all protocol versions are set on the bridge at the point on create/init.

  [Test Case]
   * deploy Openstack Train
   * go to a compute host and do: sudo ovs-ofctl -O OpenFlow14 dump-flows br-int
   * ensure you do not see "negotiation failed" errors

  [Regression Potential]
   * this patch is ensuring that newly created Neutron ovs bridges have OpenFlow 1.0, 1.3 and 1.4 set on them. Neutron already supports these so is not expected to have any change in behaviour. The patch will not impact bridges that already exist (so will not fix them either if they are affected).

  --------------------------------------------------------------------------

  As part of programming OpenvSwitch, Neutron will add to which
  protocols bridges support [0].

  However, the Open vSwitch `ovs-vswitchd` process does not appear to
  always update its perspective of which protocol versions it should
  support for bridges:

  # ovs-ofctl -O OpenFlow14 dump-flows br-int
  2019-11-12T12:52:56Z|00001|vconn|WARN|unix:/var/run/openvswitch/br-int.mgmt: version negotiation failed (we support version 0x05, peer supports version 0x01)
  ovs-ofctl: br-int: failed to connect to socket (Broken pipe)

  # systemctl restart ovsdb-server
  # ovs-ofctl -O OpenFlow14 dump-flows br-int
   cookie=0x84ead4b79da3289a, duration=1.576s, table=0, n_packets=0, n_bytes=0, priority=65535,vlan_tci=0x0fff/0x1fff actions=drop
   cookie=0x84ead4b79da3289a, duration=1.352s, table=0, n_packets=0, n_bytes=0, priority=5,in_port="int-br-ex",dl_dst=fa:16:3f:69:2e:c6 actions=goto_table:4
  ...
  (Success)

  The restart of the `ovsdb-server` process above will make `ovs-
  vswitchd` reassess its configuration.

  0:
  https://github.com/openstack/neutron/blob/0fa7e74ebb386b178d36ae684ff04f03bdd6cb0d/neutron/agent/common/ovs_lib.py#L281

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