linux-kernel - [PATCH net-next] net/mlx5: support software TX timestamp

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Message-ID: <20250506215508.3611977-1-stfomichev@gmail.com>
Date: Tue,  6 May 2025 14:55:08 -0700
From: Stanislav Fomichev <stfomichev@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	saeedm@...dia.com,
	tariqt@...dia.com,
	andrew+netdev@...n.ch,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	leon@...nel.org
Subject: [PATCH net-next] net/mlx5: support software TX timestamp

Having a software timestamp (along with existing hardware one) is
useful to trace how the packets flow through the stack.
mlx5e_tx_skb_update_hwts_flags is called from tx paths
to setup HW timestamp; extend it to add software one as well.

Signed-off-by: Stanislav Fomichev <stfomichev@...il.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c | 1 +
 drivers/net/ethernet/mellanox/mlx5/core/en_tx.c      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index fdf9e9bb99ac..e399d7a3d6cb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -1689,6 +1689,7 @@ int mlx5e_ethtool_get_ts_info(struct mlx5e_priv *priv,
 		return 0;
 
 	info->so_timestamping = SOF_TIMESTAMPING_TX_HARDWARE |
+				SOF_TIMESTAMPING_TX_SOFTWARE |
 				SOF_TIMESTAMPING_RX_HARDWARE |
 				SOF_TIMESTAMPING_RAW_HARDWARE;
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index 4fd853d19e31..f6dd26ad29e5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -341,6 +341,7 @@ static void mlx5e_tx_skb_update_hwts_flags(struct sk_buff *skb)
 {
 	if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+	skb_tx_timestamp(skb);
 }
 
 static void mlx5e_tx_check_stop(struct mlx5e_txqsq *sq)
-- 
2.49.0