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[Piotr Misiak <piotr.misiak@xxxxxxxxxxx>]

Public bug reported:

I have OpenStack environment with OVS with GRE tunnels between Compute
nodes.

All nodes OpenStack nodes have:
Description:	Ubuntu 14.04.2 LTS
Release:	14.04

After upgrading kernel from 3.13.0-45 to 3.13.0-46 on one Compute node OpenStack networking on this node no longer works.
It also does not work on any newer version up to 3.13.0-65.

Everything looks OK, bridges and ports are configured in OVS, but there
is no communication - VMs can't receive network configuration from DHCP
agent running on another server.

The same is with 3.16 kernel:

Last working version is 3.16.0-30.
With version 3.16.0-31and newer up to 3.16.0-50 network communication does not work.

I analyzed changes included in 3.13.0-46 and 3.16.0-31 and both have the same change regarding GRE:
* gre: fix the inner mac header in nbma tunnel xmit path

Maybe this is the reason?

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1504154

Title:
  OVS with GRE tunnels no longer works

Status in linux package in Ubuntu:
  New

Bug description:
  I have OpenStack environment with OVS with GRE tunnels between Compute
  nodes.

  All nodes OpenStack nodes have:
  Description:	Ubuntu 14.04.2 LTS
  Release:	14.04

  After upgrading kernel from 3.13.0-45 to 3.13.0-46 on one Compute node OpenStack networking on this node no longer works.
  It also does not work on any newer version up to 3.13.0-65.

  Everything looks OK, bridges and ports are configured in OVS, but
  there is no communication - VMs can't receive network configuration
  from DHCP agent running on another server.

  The same is with 3.16 kernel:

  Last working version is 3.16.0-30.
  With version 3.16.0-31and newer up to 3.16.0-50 network communication does not work.

  I analyzed changes included in 3.13.0-46 and 3.16.0-31 and both have the same change regarding GRE:
  * gre: fix the inner mac header in nbma tunnel xmit path

  Maybe this is the reason?

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