netdev - Re: csum offload and af

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Message-Id: <20080812.181731.249504809.davem@davemloft.net>
Date:	Tue, 12 Aug 2008 18:17:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	netdev@...eo.de, rusty@...tcorp.com.au, anthony@...emonkey.ws,
	netdev@...r.kernel.org
Subject: Re: csum offload and af_packet

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Wed, 13 Aug 2008 11:09:35 +1000

> On Tue, Aug 12, 2008 at 05:55:32PM -0700, David Miller wrote:
> > I kind of hope that libpcap/tcpdump has been taught about auxdata
> > by now, has it? :-/
> 
> Unfortunately no.  This also means that if we do do this in AF_PACKET,
> then running a packet dump on a fast outbound interface may become more
> expensive.

It seems pointless for us to add features like mmap() support and
auxdata if the most important client library and tool users of these
features never take it up.

libpcap and tcpdump have been notoriously difficult in this area.
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