Before back porting commit bd1903b7c4596 ("net: openvswitch: add hash info to
upcall"), a couple points should be addressed:
- xenial backport is skipping one netlink attribute, which will
introduce an ABI incompatibility
- Needs a test case
Submission and conversation on the kernel mailing list can be found here:
https://lists.ubuntu.com/archives/kernel-team/2020-May/109666.html
** Changed in: linux (Ubuntu Xenial)
Status: New => Incomplete
** Changed in: linux (Ubuntu Bionic)
Status: New => Incomplete
** Changed in: linux (Ubuntu Eoan)
Status: New => Incomplete
** Changed in: linux (Ubuntu Focal)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1860986
Title:
openvswitch: same tcp session encapsulated with different udp src port
for ovs vxlan tunnel
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Xenial:
Incomplete
Status in linux source package in Bionic:
Incomplete
Status in linux source package in Eoan:
Incomplete
Status in linux source package in Focal:
Incomplete
Bug description:
[SRU Justification]
[Impact]
Packets encapsulated into a vxlan tunnel with openvswitch don't have
the same udp source port for the first packet and the following ones
of the same TCP flow in a DOCKER scenario usecase.
In fact, when using the kernel datapath, the upcall don't include skb
hash info relatived. As VXLAN module uses the skb hash to select UDP
src port, the source port is different for the first packet.
More information can be found here:
https://mail.openvswitch.org/pipermail/ovs-dev/2019-October/364062.html
This has been fixed in v5.5 by the following upstream commit:
bd1903b7c4596 ("net: openvswitch: add hash info to upcall")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/openvswitch?id=bd1903b7c4596ba6f7677d0dfefd05ba5876707d
The bug exists since the beginning of vxlan support in openvswitch.
== Fix ==
Backport the requested patches to Focal (5.4), Eoan (5.3), Bionic (4.15) and
Xenial (4.4).
== Risk of Regression ==
This patch only add hash information when we do upcall, thus the risk
should be low.
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