netdev - [PATCH net-next v2] net: mvneta: add support for hardware timestamps

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Message-Id: <E1uwKHe-00000004glk-3nkJ@rmk-PC.armlinux.org.uk>
Date: Wed, 10 Sep 2025 13:50:46 +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 v2] net: mvneta: 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.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
v2: add ethtool_op_get_ts_info(), remove FIXME from comment.

 drivers/net/ethernet/marvell/mvneta.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 476e73e502fe..01eedc3e54d9 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -2985,6 +2985,13 @@ static netdev_tx_t mvneta_tx(struct sk_buff *skb, struct net_device *dev)
 		if (txq->count >= txq->tx_stop_threshold)
 			netif_tx_stop_queue(nq);
 
+		/* This is not really the true transmit point, since we batch
+		 * up several before hitting the hardware, but is the best we
+		 * can do without more complexity to walk the packets in the
+		 * pending section of the transmit queue.
+		 */
+		skb_tx_timestamp(skb);
+
 		if (!netdev_xmit_more() || netif_xmit_stopped(nq) ||
 		    txq->pending + frags > MVNETA_TXQ_DEC_SENT_MASK)
 			mvneta_txq_pend_desc_add(pp, txq, frags);
@@ -5357,6 +5364,7 @@ static const struct ethtool_ops mvneta_eth_tool_ops = {
 	.set_link_ksettings = mvneta_ethtool_set_link_ksettings,
 	.get_wol        = mvneta_ethtool_get_wol,
 	.set_wol        = mvneta_ethtool_set_wol,
+	.get_ts_info	= ethtool_op_get_ts_info,
 	.get_eee	= mvneta_ethtool_get_eee,
 	.set_eee	= mvneta_ethtool_set_eee,
 };
-- 
2.47.3