Re: [PATCH net-next-2.6] filter: add SKF_AD_RXHASH and SKF_AD_CPU

David Miller
2010-12-06T21:02:25Z

From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 01 Dec 2010 08:45:56 +0100

> Add SKF_AD_RXHASH and SKF_AD_CPU to filter ancillary mechanism,
> to be able to build advanced filters.
>
> This can help spreading packets on several sockets with a fast
> selection, after RPS dispatch to N cpus for example, or to catch a
> percentage of flows in one queue.
>
> tcpdump -s 500 "cpu = 1" :
>
> [0] ld CPU
> [1] jeq #1 jt 2 jf 3
> [2] ret #500
> [3] ret #0
>
> # take 12.5 % of flows (average)
> tcpdump -s 1000 "rxhash & 7 = 2" :
>
> [0] ld RXHASH
> [1] and #7
> [2] jeq #2 jt 3 jf 4
> [3] ret #1000
> [4] ret #0
>
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

Applied.