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

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Message-ID: <20190602021709.i7d2ngefox3peodf@localhost>
Date:   Sat, 1 Jun 2019 19:17:09 -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 01:31:34PM +0300, Vladimir Oltean wrote:
> If I dress the meta frame into a PTP frame (btw is there any
> preferable event message for this purpose?)

I would just make a L2 PTP event message from a specific source
address, just like the phyter does.

Use Ethertype ETH_P_1588 (0x88f7), and make sure the "general" bit
(0x8) of the messageType field (the first payload byte, at offset 14)
is clear.

dp83640.c uses a magic source address to identify a time stamping
status frame:

static u8 status_frame_src[6] = { 0x08, 0x00, 0x17, 0x0B, 0x6B, 0x0F };

HTH,
Richard