From: Ben Hutchings <bhutchings@solarflare.com>
Date: Wed, 19 Jan 2011 11:03:53 +0000 (+0000)
Subject: net: RPS: Enable hardware acceleration of RFS
X-Git-Tag: v2.6.39-rc1~468^2~481
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c445477d74ab3779d1386ab797fbb9b628eb9f64;p=pandora-kernel.git

net: RPS: Enable hardware acceleration of RFS

Allow drivers for multiqueue hardware with flow filter tables to
accelerate RFS.  The driver must:

1. Set net_device::rx_cpu_rmap to a cpu_rmap of the RX completion
IRQs (in queue order).  This will provide a mapping from CPUs to the
queues for which completions are handled nearest to them.

2. Implement net_device_ops::ndo_rx_flow_steer.  This operation adds
or replaces a filter steering the given flow to the given RX queue, if
possible.

3. Periodically remove filters for which rps_may_expire_flow() returns
true.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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