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Message-ID: <20230114203605.gyapleqtadgcumhk@skbuf>
Date: Sat, 14 Jan 2023 22:36:05 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Kurt Kanzenbach <kurt@...utronix.de>
Cc: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Richard Cochran <richardcochran@...il.com>,
netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3] net: dsa: mv88e6xxx: Enable PTP receive for
mv88e6390
On Fri, Jan 13, 2023 at 04:12:58PM +0100, Kurt Kanzenbach wrote:
> The switch receives management traffic such as STP and LLDP. However, PTP
> messages are not received, only transmitted.
>
> Ideally, the switch would trap all PTP messages to the management CPU. This
> particular switch has a PTP block which identifies PTP messages and traps them
> to a dedicated port. There is a register to program this destination. This is
> not used at the moment.
>
> Therefore, program it to the same port as the MGMT traffic is trapped to. This
> allows to receive PTP messages as soon as timestamping is enabled.
>
> In addition, the datasheet mentions that this register is not valid e.g., for
> 6190 variants. So, add a new PTP operation which is added for the 6390 and 6290
> devices.
>
> Tested simply like this on Marvell 88E6390, revision 1:
>
> |/ # ptp4l -2 -i lan4 --tx_timestamp_timeout=40 -m
> |[...]
> |ptp4l[147.450]: master offset 56 s2 freq +1262 path delay 413
> |ptp4l[148.450]: master offset 22 s2 freq +1244 path delay 434
> |ptp4l[149.450]: master offset 5 s2 freq +1234 path delay 446
> |ptp4l[150.451]: master offset 3 s2 freq +1233 path delay 451
> |ptp4l[151.451]: master offset 1 s2 freq +1232 path delay 451
> |ptp4l[152.451]: master offset -3 s2 freq +1229 path delay 451
> |ptp4l[153.451]: master offset 9 s2 freq +1240 path delay 451
>
> Link: https://lore.kernel.org/r/CAFSKS=PJBpvtRJxrR4sG1hyxpnUnQpiHg4SrUNzAhkWnyt9ivg@mail.gmail.com
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
> ---
Tested-by: Vladimir Oltean <olteanv@...il.com>
Thanks!
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