# \[PATCH net-next v2\] sfc: add transmit timestamping support

- From: Izabela Bakollari \<hidden\>
- Date: 2026-03-30 06:32:50 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/03/3487769
- Thread: https://ratatoskr.run/netdev/2026/03/3487769/t.md

```text
Add ethtool op to advertise TX timestamping. Insert a
skb_tx_timestamp call in __efx_enqueue_skb.

Signed-off-by: Izabela Bakollari <redacted>
Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
---
 drivers/net/ethernet/sfc/ethtool.c | 2 ++
 drivers/net/ethernet/sfc/tx.c      | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c
index 362388754a29..c0038b942913 100644
--- a/drivers/net/ethernet/sfc/ethtool.c
+++ b/drivers/net/ethernet/sfc/ethtool.c
@@ -231,6 +231,8 @@ static int efx_ethtool_get_ts_info(struct net_device *net_dev,
 {
 	struct efx_nic *efx = efx_netdev_priv(net_dev);
 
+	ts_info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE;
+
 	efx_ptp_get_ts_info(efx, ts_info);
 	return 0;
 }
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 4dff19b6ef17..ea0fc1000476 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -371,6 +371,8 @@ netdev_tx_t __efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb
 	if (!data_mapped && (efx_tx_map_data(tx_queue, skb, segments)))
 		goto err;
 
+	skb_tx_timestamp(skb);
+
 	efx_tx_maybe_stop_queue(tx_queue);
 
 	tx_queue->xmit_pending = true;
-- 
2.51.0

```