[ovs-dev] [PATCH] datapath: Add missing case OVS_TUNNEL_KEY_ATTR_PAD

Joe Stringer joe at ovn.org
Tue Mar 14 23:02:29 UTC 2017


On 14 March 2017 at 11:30, Kris Murphy <kriskend at linux.vnet.ibm.com> wrote:
> Recreate and error info:
>
> Hit a new issue with OVS after updating to the Ubuntu 4.8 kernel from the
> Ubuntu 4.4 kernel.
>
> Iperf was used to send traffic between client VMs over VXLAN. The traffic
> did still flow, but every packet had to go to user space due to the flow
> creation failures, which drastically impacted performance and cpu
> utilization.
>
> When using VXLAN, the following error is showing up in dmesg
>
> openvswitch: netlink: Unknown IP tunnel attribute 14
>
> Also there are tons of these errors in the openvswitch log
>
> 2017-03-01T15:50:47.860Z|00018|dpif(handler164)|WARN|system at ovs-system:
> failed to put[create] (Invalid argument)
> ufid:2d1a9aeb-7b24-4235-a208-a01f98237e60 recirc_id(0),dp_hash(0/0),skb_pri
>
> Debug showed that this attribute, OVS_TUNNEL_KEY_ATTR_PAD, was being seen in
> the switch statement in method, static int ip_tun_from_nlattr, in
> flow_netlink.c .  Because there is no case for this attribute, the default
> is hit and returns an error.
>
> The issue was first seen using the packages in the Ubuntu 4.8 kernel, which
> is OVS 2.5.  OVS 2.6 and 2.6.1 were also tried with the kernel packages and
> the same issue was seen.  Tried building OVS 2.7 and loading the
> openvswitch-datapath-dkms_2.7.0-1_all.deb that got built but the issue
> persisted.  The proposed patch seems to eliminate the error messages and
> also fixed the segmentation and performance issues that were seen.

Thanks for the report!

Would you mind preparing this against the linux "net" tree and sending
to netdev mailinglist, since that's the upstream for Linux datapath
changes?

You can use this tag in the commit message, as well:
Fixes: b46f6ded906e ("libnl: nla_put_be64(): align on a 64-bit area")


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