netdev - [PATCH net] net: ethtool: handle EOPNOTSUPP from ethtool get_ts

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Message-Id: <E1uwiW3-00000004jRF-3CnC@rmk-PC.armlinux.org.uk>
Date: Thu, 11 Sep 2025 15:43:15 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>
Subject: [PATCH net] net: ethtool: handle EOPNOTSUPP from ethtool
 get_ts_info() method

Network drivers sometimes return -EOPNOTSUPP from their get_ts_info()
method, and this should not cause the reporting of PHY timestamping
information to be prohibited. Handle this error code, and also
arrange for ethtool_net_get_ts_info_by_phc() to return -EOPNOTSUPP
when the method is not implemented.

This allows e.g. PHYs connected to DSA switches which support
timestamping to report their timestamping capabilities.

Fixes: b9e3f7dc9ed9 ("net: ethtool: tsinfo: Enhance tsinfo to support several hwtstamp by net topology")
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
--
v2: add Fixes: tag
---
 net/ethtool/common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 4f58648a27ad..92e6a681c797 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -905,7 +905,7 @@ int ethtool_net_get_ts_info_by_phc(struct net_device *dev,
 	int err;
 
 	if (!ops->get_ts_info)
-		return -ENODEV;
+		return -EOPNOTSUPP;
 
 	/* Does ptp comes from netdev */
 	ethtool_init_tsinfo(info);
@@ -973,7 +973,7 @@ int ethtool_get_ts_info_by_phc(struct net_device *dev,
 	int err;
 
 	err = ethtool_net_get_ts_info_by_phc(dev, info, hwprov_desc);
-	if (err == -ENODEV) {
+	if (err == -ENODEV || err == -EOPNOTSUPP) {
 		struct phy_device *phy;
 
 		phy = ethtool_phy_get_ts_info_by_phc(dev, info, hwprov_desc);
-- 
2.47.3