netdev - Re: csum offload and af

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Message-Id: <20080812.182506.03341781.davem@davemloft.net>
Date:	Tue, 12 Aug 2008 18:25:06 -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 11:21:29 +1000

> On Tue, Aug 12, 2008 at 06:17:31PM -0700, David Miller wrote:
> >
> > 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.
> 
> Well auxdata at least is used by dhcp-common and therefore dhcp-client
> and dhcp-server.

Only because _YOU_ added it :-)

> > libpcap and tcpdump have been notoriously difficult in this area.
> 
> Yes the disconnect between the kernel community and the rest is
> large.  The only successful examples seems to be where the user-
> space code is maintained by a kernel developer, e.g., iproute.

Isn't that the truth...

Alexey was maintaining his own semi-fork of libpcap and tcpdump for
years for the same reasons.

Let's write a real packet capturing tool that will be fast and that we
can add quick support for new kernel features to.

I mean, what other alternative is there?  The pcap/tcpdump folks have
had 10+ years to get their act in gear.
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