Re: [Linuxptp-users] IEEE802.1AS support?

[Richard C. <ric...@gm...>]

On Thu, Mar 22, 2012 at 03:40:50PM +1300, Eliot Blennerhassett wrote:
> 
> Seeing the commit of raw ethernet transport, I wonder if there are any
> plans to support 802.1AS (aka gPTP)?

I was not thinking about AS directly, but, yes, I think it can be
supported.
 
> Section 7.5 of the standard[1] covers differences between gPTP and PTP
> 
> Very basic ways that gPTP is different from PTP
> * layer 2 only, PTPv2 only

Just added, probably needs more testing.  The L2 code also needs VLAN
support, and I already have and idea how to add that.

> * only uses the peer to peer multicast address

I definitely want to add the P2P mechanism.

> * 4-bit transportSpecific field in PTP header is 0x1
> * most other differences are ways in which gPTP is a subset of PTP

So it looks like adding gPTP is doable.
 
> (Aside: I followed the links from http://linuxptp.sourceforge.net/ to
> linuxptp-devel archives, but they appear to be empty - is that mailing
> list active, or is this list being used instead?)

It is not dead. It just never lived yet. The -devel list is meant to
be a place to post patches. So far, I am the only code author, but I
would welcome code contributions.

People are only just starting to notice this project.

> [1] http://standards.ieee.org/getieee802/download/802.1AS-2011.pdf

Okay, I will take a look at this.

Thanks,
Richard