netdev - [PATCH net-next 0/2] net: stmmac: correctly populate ptp_clock

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Message-ID: <aLhJ8Gzb0T2qpXBE@shell.armlinux.org.uk>
Date: Wed, 3 Sep 2025 15:00:16 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Richard Cochran <richardcochran@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next 0/2] net: stmmac: correctly populate
 ptp_clock_ops.getcrosststamp

Hi,

While reviewing code in the stmmac PTP driver, I noticed that the
getcrosststamp() method is always populated, irrespective of whether
it is implemented or not by the stmmac platform specific glue layer.

Where a platform specific glue layer does not implement it, the core
stmmac driver code returns -EOPNOTSUPP. However, the PTP clock core
code uses the presence of the method in ptp_clock_ops to determine
whether this facility should be advertised to userspace (see
ptp_clock_getcaps()).

Moreover, the only platform glue that implements this method is the
Intel glue, and for it not to return -EOPNOTSUPP, the CPU has to
support X86_FEATURE_ART.

This series updates the core stmmac code to only provide the
getcrosststamp() method in ptp_clock_ops when the platform glue code
provides an implementation, and then updates the Intel glue code to
only provide its implementation when the CPU has the necessary
X86_FEATURE_ART feature.

As I do not have an Intel card to test with, these changes are
untested, so if anyone has such a card, please test. Thanks.

 drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c |  7 +++----
 drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c  | 10 ++++------
 2 files changed, 7 insertions(+), 10 deletions(-)

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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