netdev - Re: [PATCH net-next RFC 0/9] net: dsa: PTP timestamping for mv88e6xxx

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Message-ID: <20171204011319.lkib6hor3ln5gtuc@localhost>
Date:   Sun, 3 Dec 2017 17:13:19 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Brandon Streiff <brandon.streiff@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Erik Hons <erik.hons@...com>
Subject: Re: [PATCH net-next RFC 0/9] net: dsa: PTP timestamping for mv88e6xxx

On Tue, Nov 07, 2017 at 07:23:27PM -0800, Richard Cochran wrote:
> The application does join that group on the external (slave)
> interface.  I'll find out why the delay request mechanism isn't
> working...

Looking back, I now recall that the series lets the HW embed the time
stamps into the protocol buffers.  In the case of UDP, this
invalidates the checksum unless the HW corrects it.  I'll bet that is
what is happening...
 
Thanks,
Richard