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[OpenStack Infra <1901534@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/759673
Committed: https://opendev.org/openstack/neutron/commit/323781d9f0992dc3691620ca0a366afae4ed34ee
Submitter: Zuul
Branch:    master

commit 323781d9f0992dc3691620ca0a366afae4ed34ee
Author: Daniel Alvarez <dalvarez@xxxxxxxxxx>
Date:   Mon Oct 26 13:15:48 2020 +0100

    [ovn] Add 'net-mtu-writable' to supported extensions
    
    This patch is adding the 'net-mtu-writable' extension to the
    supported extensions list of the OVN plugin.
    
    Without it, network creation with an MTU different from the
    default (1500) will fail. Right now, devstack is working
    because this extension gets loaded as a side effect of loading
    'logger' but we should enable it by default.
    
    Closes-Bug: #1901534
    
    Depends-On: https://review.opendev.org/760446
    Change-Id: I9ff47d8f678c95a6d6594f47ebca6175fdcc5453
    Signed-off-by: Daniel Alvarez <dalvarez@xxxxxxxxxx>


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

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https://bugs.launchpad.net/bugs/1901534

Title:
  Neutron fail to create networks because of MTU value

Status in neutron:
  Fix Released

Bug description:
  After
  https://github.com/openstack/neutron/commit/ebb866310b48cbad2ae772e0551aaf994858a51e
  when creating a tenant neutron without specifying mtu size with ovn
  driver, it fails with error:

  osc_lib.exceptions.CommandError: Error while executing command: BadRequestException: 400, Invalid input for operation: Requested MTU is too big, maximum is 1442.                             
  clean_up CreateNetwork: Error while executing command: BadRequestException: 400, Invalid input for operation: Requested MTU is too big, maximum is 1442.     

  Checking at neutron server logs, i see:

  2020-10-26 11:17:15.592 61398 DEBUG neutron.api.extensions [req-1904932b-3ce6-48e5-8601-a746e3a546da - - - - -] Ext name="Network MTU (writable)" alias="net-mtu-writable" description="Provid
  es a writable MTU attribute for a network resource." updated="2017-07-12T00:00:00-00:00" _check_extension /usr/lib/python3.6/site-packages/neutron/api/extensions.py:413                      
  2020-10-26 11:17:15.593 61398 INFO neutron.api.extensions [req-1904932b-3ce6-48e5-8601-a746e3a546da - - - - -] Extension net-mtu-writable not supported by any of loaded plugins        

  I've realized that in devstack tests, this is working fine because
  it's enabling logger mechanism driver in addition to ovn. I understand
  this driver is intended for testing and debug only and should not
  included in production deployments so this is a real issue.

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