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

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Message-ID: <20190601050714.xylw5noxka7sa4p3@localhost>
Date:   Fri, 31 May 2019 22:07:14 -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 Fri, May 31, 2019 at 09:12:03PM +0300, Vladimir Oltean wrote:
> It won't work unless I make changes to dsa_switch_rcv.

Or to the tagging code.

> Right now taggers can only return a pointer to the skb, or NULL, case
> in which DSA will free it.

The tagger can re-write the skb.  Why not reform it into a PTP frame?
This clever trick is what the phyter does in hardware.  See dp83640.c.

Thanks,
Richard