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@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. Kris Murphy (1): openvswitch: Add missing case OVS_TUNNEL_KEY_ATTR_PAD net/openvswitch/flow_netlink.c | 2 ++ 1 file changed, 2 insertions(+) -- 2.7.4
