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

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Message-ID: <20190602021856.viayjqiifg4yok6c@localhost>
Date:   Sat, 1 Jun 2019 19:18:56 -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 Sat, Jun 01, 2019 at 03:06:59PM +0300, Vladimir Oltean wrote:
> PTP frames will reconstruct the full timestamp without waiting for any
> meta (they are the meta), while other MAC-trapped frames (STP etc)
> will just carry a meaningless skb->cb when passed up the stack.
> In retrospect, it would have been amazing if the switch gave me the
> meta frames *before* the actual link-local frames that needed the
> timestamp.

I didn't follow everything you wrote, but it sounds like you are on
the right track!

Thanks,
Richard