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Message-ID: <20090920205047.0f2df70c@pundit>
Date: Sun, 20 Sep 2009 20:50:47 +0200
From: Christopher Zimmermann <madroach@...web.de>
To: netdev@...r.kernel.org
Subject: Re: SO_TIMESTAMPING fix and design decisions
On Sun, 20 Sep 2009 10:48:13 -0700
Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com> wrote:
> 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?
It will need to be modified. If you want to avoid this, one could keep
the HWTSTAMP_FILTER_PTP_.... defines and just redifine them to reflect
the new interface.
Where can I find this ptpd userspace daemon, which supports hardware
timestamps using the ioctl interface? ptpd.sourceforge.net doesn't.
Cheers,
Christopher Zimmermann
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