[PATCH net-next] hv_netvsc: Use simple parser for IPv4 and v6 headers

[David Miller]

From: Haiyang Zhang <haiyangz at microsoft.com>
Date: Wed, 16 Dec 2015 19:20:44 +0000

> In our test, we have bisected and found the following patch introduced big 
> overhead into skb_flow_dissect_flow_keys(), and caused performance 
> regression:
> commit: d34af823
> net: Add VLAN ID to flow_keys

NEVER _EVER_ work around this kind of problem by bypassing the code in
question in your driver.

ALWAYS work to fix the actual problem.