net/mlx4_en: Add accelerated RFS support

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Use RFS infrastructure and flow steering in HW to keep CPU
affinity of rx interrupts and application per TCP stream.

A flow steering filter is added to the HW whenever the RFS
ndo callback is invoked by core networking code.

Because the invocation takes place in interrupt context, the
actual setup of HW is done using workqueue. Whenever new filter
is added, the driver checks for expiry of existing filters.

Since there's window in time between the point where the core
RFS code invoked the ndo callback, to the point where the HW
is configured from the workqueue context, the 2nd, 3rd etc
packets from that stream will cause the net core to invoke
the callback again and again.

To prevent inefficient/double configuration of the HW, the filters
are kept in a database which is indexed using hash function to enable
fast access.

Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Amir Vadai 2012-07-18 22:33:52 +00:00 • committed by David S. Miller

parent d9236c3f10

commit 1eb8c695bd

4 changed files with 342 additions and 1 deletions

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8

drivers/net/ethernet/mellanox/mlx4/en_cq.c

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316

drivers/net/ethernet/mellanox/mlx4/en_netdev.c

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3

drivers/net/ethernet/mellanox/mlx4/en_rx.c

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16

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

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