linux-kernel - Re: [PATCH net-next v4 2/3] net: ethernet: ti: am65-cpsw: Enable RX HW timestamp only for PTP packets

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Date: Fri, 29 Mar 2024 14:59:04 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Chintan Vankar <c-vankar@...com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>, Siddharth Vadapalli
 <s-vadapalli@...com>, Grygorii Strashko <grygorii.strashko@...com>, "Heiner
 Kallweit" <hkallweit1@...il.com>, Vladimir Oltean
 <vladimir.oltean@....com>, Andrew Lunn <andrew@...n.ch>, Roger Quadros
 <rogerq@...nel.org>, Richard Cochran <richardcochran@...il.com>, Paolo
 Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, "David S.
 Miller" <davem@...emloft.net>, <linux-kernel@...r.kernel.org>,
 <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v4 2/3] net: ethernet: ti: am65-cpsw: Enable RX
 HW timestamp only for PTP packets

On Wed, 27 Mar 2024 11:12:33 +0530 Chintan Vankar wrote:
> To prevent port lock up, disable TSTAMP_EN bit in CPTS_CONTROL
> register. The workaround for timestamping received packets is to
> utilize the CPTS Event FIFO that records timestamps corresponding to
> certain events, with one such event being the reception of an
> Ethernet packet with the EtherType field set to Precision Time
> Protocol (PTP).

You mention EtherType here but the drive retains L4 support,
which is somewhat confusing. Perhaps mention L4 / UDP ports
here, too.