Centos 6.5 kernel has broken GRE OVS datapath

[Vladimir Kuklin]

We need to recompile kernel package with CONFIG_NET_IPGRE_DEMUX=m option as it blocks OVS datapath in kernels prior to 2.6.37.
It breaks all the connectivity between VMs and neutron agents in neutron-enabled installations.

[Vitaly Parakhin (vparakhin)]

The problem could be solved by updating OVS, as they already addressed the issue with GRE datapath: http://openvswitch.org/pipermail/dev/2013-June/028982.html

Please consider this possibility instead of rebuilding the stock kernel.

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: master
Review: https://review.openstack.org/90940

[Roman Vyalov (r0mikiam)]

building to http://osci-obs.vm.mirantis.net:82/centos-fuel-5.0-stable-15037/

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/90940
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=4026cd6551ce81a69783a3803f099290f9d6a4ef
Submitter: Jenkins
Branch: master

commit 4026cd6551ce81a69783a3803f099290f9d6a4ef
Author: Roman Vyalov <email address hidden>
Date: Tue Apr 29 11:50:51 2014 +0400

    Hardcode kernel version in requirements-rpm

    Hardcode kernel version to -2.6.32-431.el6.x86_64

    Change-Id: Ia5944247aafeb48cf3f3323fbdb7f32da58aa1aa
    Closes-bug:#1312332

[Artem Panchenko (apanchenko-8)]

Verified on ISO # 26 (RC5)

[root@nailgun ~]# fuel --fuel-version
api: '1.0'
astute_sha: a7eac46348dc77fc2723c6fcc3dbc66cc1a83152
build_id: 2014-05-27_05-51-41
build_number: '26'
fuellib_sha: 2f79c0415159651fc1978d99bd791079d1ae4a06
fuelmain_sha: 505741e4f431f85a8d0252fc42754d10c0326c1a
mirantis: 'yes'
nailgun_sha: bd09f89ef56176f64ad5decd4128933c96cb20f4
ostf_sha: a8b7660082a6f152794c610d6abe30d360fd577d
production: docker
release: '5.0'

[root@nailgun ~]# uname -a
Linux nailgun.test.domain.local 2.6.32-431.el6.x86_64 #1 SMP Wed May 14 15:10:05 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

[root@nailgun ~]# grep CONFIG_NET_IPGRE_DEMUX /boot/config-2.6.32-431.el6.x86_64
CONFIG_NET_IPGRE_DEMUX=m