netdev - Re: ptp

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Message-ID: <20160907211223.GA31741@localhost.localdomain>
Date:   Wed, 7 Sep 2016 23:12:23 +0200
From:   Richard Cochran <richardcochran@...il.com>
To:     Daniel Walker <danielwa@...co.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "xe-kernel@...ernal.cisco.com" <xe-kernel@...ernal.cisco.com>,
        "Shabeena Shabeena -X (sshabeen - ARICENT TECHNOLOGIES MAURIITIUS
        LIMITED at Cisco)" <sshabeen@...co.com>
Subject: Re: ptp

On Wed, Sep 07, 2016 at 01:55:19PM -0700, Daniel Walker wrote:
> So the code only allows second granularity negative updates,

No.

> or the seconds
> component is the only part which needs to actually be negative ?

Yes.

See the function, clockadj_step, in linuxptp/clockadj.c for a working
user space example.

Thanks,
Richard