From: Jason Wang <jasowang@redhat.com>
Date: Mon, 25 Mar 2013 20:19:58 +0000 (+0000)
Subject: netback: set transport header before passing it to kernel
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~65^2~326^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9ca8f74399f9195fd8e01f67a8424a8d33efa55;p=pandora-kernel.git

netback: set transport header before passing it to kernel

Currently, for the packets receives from netback, before doing header check,
kernel just reset the transport header in netif_receive_skb() which pretends non
l4 header. This is suboptimal for precise packet length estimation (introduced
in 1def9238: net_sched: more precise pkt_len computation) which needs correct l4
header for gso packets.

The patch just reuse the header probed by netback for partial checksum packets
and tries to use skb_flow_dissect() for other cases, if both fail, just pretend
no l4 header.

Cc: Eric Dumazet <edumazet@google.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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