netdev - RE: [E1000-devel] [PATCH] fixing hw timestamping in igb

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Date:	Tue, 8 Feb 2011 08:27:25 -0800
From:	"Ronciak, John" <john.ronciak@...el.com>
To:	Anders Berggren <anders@...on.se>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [E1000-devel] [PATCH] fixing hw timestamping in igb

> -----Original Message-----
> From: Anders Berggren [mailto:anders@...on.se]
> Sent: Tuesday, February 08, 2011 7:25 AM
> To: Kirsher, Jeffrey T
> Cc: Ronciak, John; e1000-devel@...ts.sourceforge.net;
> netdev@...r.kernel.org
> Subject: Re: [E1000-devel] [PATCH] fixing hw timestamping in igb
> 
> On Feb 4, 2011, at 12:23 AM, Jeff Kirsher wrote:
> 
> > Thanks Anders, I will add this patch to my queue of igb patches.
> 
> Another question which I asked John Ronciak earlier; is there any work
> on TX timestamping for IPv6? In 2.6.37 sock_tx_timestamp() is only
> called in IPv4 UDP (net/ipv4/udp.c) and raw sockets
> (net/packet/af_packet.c).
> 
> Would it be meaningful if I tried to add it to ipv6/ip6_output.c as
> Marcus D. Leech suggested in http://kerneltrap.org/mailarchive/linux-
> netdev/2009/11/10/6260604 and http://kerneltrap.org/mailarchive/linux-
> netdev/2009/11/11/6260643
Anders,

The question of IPv6 support for TX timestamping is still under discussion.  We are trying to understand the use case for it as well as how it would be used.  We have had no customers asking for this type of support (at least not yet).  If there is kernel work going on regarding it then maybe this needs to be looked at closer.

Other than being a science project, what is your use case for the TX timestamping in IPv6?

Cheers,
John
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