netdev - Re: SO_TIMESTAMPING fix and design decisions

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Message-Id: <1253468893.2654.6.camel@localhost.localdomain>
Date:	Sun, 20 Sep 2009 10:48:13 -0700
From:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
To:	Christopher Zimmermann <madroach@...web.de>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: SO_TIMESTAMPING fix and design decisions

On Sun, 2009-09-20 at 00:52 -0700, Christopher Zimmermann wrote:
> On Sat, 19 Sep 2009 15:09:21 -0700
> Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com> wrote:
> 
> > > hardware timestamps only work for the Intel igb driver. I have 
> > > access to two test machines with NICs supported by this driver.
> > 
> > Intel's 82599, supported by ixgbe, also has the same IEEE 1588
> > timestamping support in hardware.  We haven't implemented the support
> > yet in ixgbe, but the hardware is there and does work.  If you were
> > curious of the interface, the datasheet for the hardware is available on
> > our SourceForge site (e1000.sf.net).
> 
> hi! thanks for the reply.
> 
> I already got the documentation for the 82576 cards I have access to. I 
> won't be able to afford another pair.
> 
> What do you think about my idea to expose the relevant registers to 
> userspace? I believe it would not be too difficult for userspace to 
> configure the timestamps this way and would allow way more flexibility. 
> Of course I would #DEFINE the constants used to set the registers.

The patch seems reasonable, but I haven't played with the igb
timestamping very much.  However, what impact will this have on the
existing ptpd userspace daemon?

-PJ

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