netdev - [PATCH net-next] net: mvpp2: add support for hardware timestamps

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Message-Id: <E1uy82E-00000005Sll-0SSy@rmk-PC.armlinux.org.uk>
Date: Mon, 15 Sep 2025 13:10:18 +0100
From: Russell King <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Marcin Wojtas <marcin.s.wojtas@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next] net: mvpp2: add support for hardware timestamps

Add support for hardware timestamps in (e.g.) the PHY by calling
skb_tx_timestamp() as close as reasonably possible to the point that
the hardware is instructed to send the queued packets.

As this also introduces software timestamping support, report those
capabilities via the .get_ts_info() method.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 35d1184458fd..ab0c99aa9f9a 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -4439,6 +4439,8 @@ static netdev_tx_t mvpp2_tx(struct sk_buff *skb, struct net_device *dev)
 		txq_pcpu->count += frags;
 		aggr_txq->count += frags;
 
+		skb_tx_timestamp(skb);
+
 		/* Enable transmit */
 		wmb();
 		mvpp2_aggr_txq_pend_desc_add(port, frags);
@@ -5252,14 +5254,14 @@ static int mvpp2_ethtool_get_ts_info(struct net_device *dev,
 {
 	struct mvpp2_port *port = netdev_priv(dev);
 
+	ethtool_op_get_ts_info(dev, info);
 	if (!port->hwtstamp)
-		return -EOPNOTSUPP;
+		return 0;
 
 	info->phc_index = mvpp22_tai_ptp_clock_index(port->priv->tai);
-	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
-				SOF_TIMESTAMPING_TX_HARDWARE |
-				SOF_TIMESTAMPING_RX_HARDWARE |
-				SOF_TIMESTAMPING_RAW_HARDWARE;
+	info->so_timestamping |= SOF_TIMESTAMPING_TX_HARDWARE |
+				 SOF_TIMESTAMPING_RX_HARDWARE |
+				 SOF_TIMESTAMPING_RAW_HARDWARE;
 	info->tx_types = BIT(HWTSTAMP_TX_OFF) |
 			 BIT(HWTSTAMP_TX_ON);
 	info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) |
-- 
2.47.3