From: Tom Herbert <therbert@google.com>
Date: Wed, 15 Jan 2014 16:58:06 +0000 (-0800)
Subject: net: Check skb->rxhash in gro_receive
X-Git-Tag: v3.14-rc1~94^2~131
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b4cec8c2e872a6bc9146a001d7532f31023aed5;p=pandora-kernel.git

net: Check skb->rxhash in gro_receive

When initializing a gro_list for a packet, first check the rxhash of
the incoming skb against that of the skb's in the list. This should be
a very strong inidicator of whether the flow is going to be matched,
and potentially allows a lot of other checks to be short circuited.
Use skb_hash_raw so that we don't force the hash to be calculated.

Tested by running netperf 200 TCP_STREAMs between two machines with
GRO, HW rxhash, and 1G. Saw no performance degration, slight reduction
of time in dev_gro_receive.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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