net: RPS: Enable hardware acceleration of RFS

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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>

...

This commit is contained in:

Ben Hutchings 2011-01-19 11:03:53 +00:00 • committed by David S. Miller

parent c39649c331

commit c445477d74

3 changed files with 127 additions and 9 deletions

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33

include/linux/netdevice.h

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6

net/Kconfig

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97

net/core/dev.c

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