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[OpenStack Infra <1868137@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/714716
Committed: https://opendev.org/openstack/neutron/commit/dc4a57d96661fcb56ff916cafbbbdc683653e9c4
Submitter: "Zuul (22348)"
Branch:    master

commit dc4a57d96661fcb56ff916cafbbbdc683653e9c4
Author: Radosław Piliszek <radoslaw.piliszek@xxxxxxxxx>
Date:   Tue Mar 24 17:55:23 2020 +0100

    Make OVN driver validate Geneve max_header_size
    
    Also updates the docs to be clearer on OVN-Geneve relation topics.
    
    Co-Authored-By: Elvira García Ruiz <egarciar@xxxxxxxxxx>
    Change-Id: Ia253cc4d85261ce1535f4d27b3da91275d879903
    Closes-bug: #1868137


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

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https://bugs.launchpad.net/bugs/1868137

Title:
  default geneve overhead is not set high enough for ovn

Status in neutron:
  Fix Released

Bug description:
  Comparing:
  https://opendev.org/openstack/neutron/src/commit/5e84289f68402b401d9a35d93473d9517a43e300/devstack/lib/ovn_agent#L78
  with:
  https://opendev.org/openstack/neutron-lib/src/commit/37deb266394a5c633309b3ad66241bb02695bdb9/neutron_lib/constants.py#L325

  And we get MTU errors when leaving default.
  [ml2_type_geneve]/max_header_size has to be set to 38 to make Geneve encapsulation work in OVN.

  Devstack does the override above so the real default is not tested.

  Release: Ussuri

  This does not affect bare OVS with OVS agent.

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