linux-kernel - Re: [PATCH net-next 0/5] PTP support for the SJA1105 DSA driver

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Message-ID: <20190531043417.6phscbpmo6krvxam@localhost>
Date:   Thu, 30 May 2019 21:34:17 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/5] PTP support for the SJA1105 DSA driver

On Thu, May 30, 2019 at 06:23:09PM +0300, Vladimir Oltean wrote:
> On Thu, 30 May 2019 at 18:06, Richard Cochran <richardcochran@...il.com> wrote:
> >
> > But are the frames received in the same order?  What happens your MAC
> > drops a frame?
> >
> 
> If it drops a normal frame, it carries on.
> If it drops a meta frame, it prints "Expected meta frame", resets the
> state machine and carries on.
> If it drops a timestampable frame, it prints "Unexpected meta frame",
> resets the state machine and carries on.

What I meant was, consider how dropped frames in the MAC will spoil
any chance that the driver has to correctly match time stamps with
frames.

Thanks,
Richard