linux-kernel - Re: [PATCH net-next 3/5] net: dsa: mv88e6xxx: Let taggers specify a can

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Date:   Thu, 30 May 2019 08:01:47 -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 3/5] net: dsa: mv88e6xxx: Let taggers specify a
 can_timestamp function

On Thu, May 30, 2019 at 05:47:55PM +0300, Vladimir Oltean wrote:
> Yes, they don't identify the original frame.
> The hardware's line of thinking seems to be "The meta frame is sent
> immediately after the trapped frame that triggered the action." (quote
> from https://www.nxp.com/docs/en/user-guide/UM10944.pdf).

Hm.

> If there was any other way to retrieve RX timestamps I would have done
> it already.

So it cannot even possibly work.
 
Sorry,
Richard