netdev - Re: [RFC] net : add tx timestamp to packet mmap.

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Message-ID: <20130409131534.GB5132@netboy>
Date:	Tue, 9 Apr 2013 15:15:35 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Paul Chavent <Paul.Chavent@...ra.fr>
Cc:	davem@...emloft.net, edumazet@...gle.com,
	daniel.borkmann@....ee.ethz.ch, xemul@...allels.com,
	ebiederm@...ssion.com, netdev@...r.kernel.org
Subject: Re: [RFC] net : add tx timestamp to packet mmap.

On Tue, Apr 09, 2013 at 12:42:57PM +0200, Paul Chavent wrote:
> 
> Would it be possible that the packet mmap maintainers give their
> opinion on this thread please ?

I was digging around, trying to understand whether libpcap can get HW
time stamps via the packet_mmap interface, and I found this.

 commit 614f60fa9d73a9e8fdff3df83381907fea7c5649
 Author: Scott McMillan <scott.a.mcmillan@...el.com>
 Date:   Wed Jun 2 05:53:56 2010 -0700

    packet_mmap: expose hw packet timestamps to network packet capture utilities

Maybe you could ask Scott for help?

[ It looks to me like that patch is kinda useless, since the user has
  no way to tell whether the time stamps are from HW or SW. ]

HTH,
Richard
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