Boundary clock support for ptpd

[Ronciak, John]

Wow, I did not get these mails from netdev for some reason (maybe related to the vger problem?). Anyway, this looks to be a pretty complete solution.  I have not looked to see what kind of driver changes are required to interface to this.  I also didn't see any comment back from DaveM on this yet.  He's probably been busy with the whole vger thing of the last couple of days.

I'll start looking at the code to see what needs to happen in the igb driver to support this infrastructure.

Wolfgang, thanks for the pointer.

Cheers,
John


> -----Original Message-----
> From: ptpd-bounces at lists.infradead.org [mailto:ptpd-
> bounces at lists.infradead.org] On Behalf Of George Neville-Neil
> Sent: Friday, April 30, 2010 8:35 AM
> To: Wolfgang Grandegger
> Cc: ptpd at lists.infradead.org
> Subject: Re: Boundary clock support for ptpd
> 
> 
> On Apr 30, 2010, at 11:27 , Wolfgang Grandegger wrote:
> 
> > gnn wrote:
> >> On 4/15/10 15:54 , Wolfgang Grandegger wrote:
> >>> Hello,
> >>>
> >>> anybody listening?
> >>>
> >>
> >> Yes, just a bit slow.
> >>
> >>> Wolfgang Grandegger wrote:
> >>>> Hello,
> >>>>
> >>>> I'm currently evaluating ptpd-1.0.0 for IEEE1588 time
> >>>> syncronization with MPC8313 boards. I realized that there is an
> >>>> effort to support PTPv2 (at
> >>>> http://ptpd.svn.sourceforge.net/viewvc/ptpd/branches/v2/). Could
> >>>> somebody give a brief status on what is already working/supported.
> >>>> I'm especially looking for boundary clock support (master and
> slave on the same board).
> >>> In the meantime I made some progress. I cascaded three MPC8313
> >>> boards and measured jitters of +-150ns on the second and +-300ns on
> >>> the third board with ptpd *v1*. I will now try with v2 allowing for
> >>> shorter sync intervals, which should reduce the jitter
> significantly.
> >>>
> >>> I also found some interesting related link. Apart from the PTPDv2
> >>> implementation mentioned above, there is another one, especially
> for
> >>> the MPC8313, mentioned here:
> >>>
> >>> http://forums.freescale.com/t5/Other-Microcontrollers/Open-source-
> fo
> >>> r-IEEE-1588-PTP-v2-supporting-MPC831x-to-be/m-
> p/53829;jsessionid=9DF
> >>> 51308EB4B68D57F509D77E77C8DD9
> >>> http://code.google.com/p/ptpv2d/
> >>>
> >>> As I see it, this one also lacks support for recent kernel versions
> >>> using the timestamping interface:
> >>>
> >>> http://lxr.linux.no/linux/Documentation/networking/timestamping.txt
> >>>
> >>> Is there already an effort supporting that generic interface in
> ptpd
> >>> or ptpdv2?
> >>
> >>
> >> I have not looked at that, but I will try to check that out.
> >
> > FYI, Richard Cochran posted recently a patch series for a generic
> IEEE
> > 1588 hardware clock support, which together with the hw timestamping
> > interface, does provide a common Linux interface for PTP
> applications:
> >
> >  http://marc.info/?l=linux-netdev&m=127235963807285&w=2
> 
> OK, I'll look into that.
> 
> Thanks,
> George
> 
> 
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