netdev - Re: [PATCH 2/2] packet: Add fanout support.

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Date:	Tue, 05 Jul 2011 09:08:09 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Chetan.Loke@...scout.com
Cc:	eric.dumazet@...il.com, victor@...iniac.net, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] packet: Add fanout support.

From: "Loke, Chetan" <Chetan.Loke@...scout.com>
Date: Tue, 5 Jul 2011 12:03:29 -0400

> Can we not do something like:
> 
> a = src_ip_addr;
> b = dst_ip_addr;
> 
> if (ip_is_fragment(ip_hdr(skb)))
> 	c = ip_hdr->id;
> else
> 	c = src_port | dest_port ; /* port_32 etc - Similar to what we have today 

A UDP flow can be composed of fragmented and non-fragmented
parts, we want all of the packets from that flow to land
on the same hash.

Your scheme does not provide that essential property.
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