[Bug 1676679] [NEW] datapath: Add missing case OVS_TUNNEL_KEY_ATTR_PAD

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---Problem Description---
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.
 
---uname output---
stock 4.8 kernel
 
Machine Type = p8 
 
---Debugger---
A debugger is not configured
 
---Steps to Reproduce---
 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

Link to the patch is https://patchwork.ozlabs.org/patch/738856/

** Affects: openvswitch (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64 bugnameltc-152930 severity-medium targetmilestone-inin1610
-- 
datapath: Add missing case OVS_TUNNEL_KEY_ATTR_PAD
https://bugs.launchpad.net/bugs/1676679
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