From: Eric Dumazet <dada1@cosmosbay.com>
Date: Fri, 1 May 2009 16:05:06 +0000 (-0700)
Subject: net: Fix skb_tx_hash() for forwarding workloads.
X-Git-Tag: v2.6.30-rc5~39^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ec581f6a42bbbea5271c66da9769a41b46c74e10;p=pandora-kernel.git

net: Fix skb_tx_hash() for forwarding workloads.

When skb_rx_queue_recorded() is true, we dont want to use jash distribution
as the device driver exactly told us which queue was selected at RX time.
jhash makes a statistical shuffle, but this wont work with 8 static inputs.

Later improvements would be to compute reciprocal value of real_num_tx_queues
to avoid a divide here. But this computation should be done once,
when real_num_tx_queues is set. This needs a separate patch, and a new
field in struct net_device.

Reported-by: Andrew Dickinson <andrew@whydna.net>
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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