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

[Stanislav Fomichev <stfomichev@gmail.com>]

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@gmail.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