netdev - [PATCH v1 net-next 08/11] net: ena: Relocate skb_tx_timestamp() to improve time stamping accuracy

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Message-ID: <20240129085531.15608-9-darinzon@amazon.com>
Date: Mon, 29 Jan 2024 08:55:28 +0000
From: <darinzon@...zon.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	<netdev@...r.kernel.org>
CC: David Arinzon <darinzon@...zon.com>, "Woodhouse, David" <dwmw@...zon.com>,
	"Machulsky, Zorik" <zorik@...zon.com>, "Matushevsky, Alexander"
	<matua@...zon.com>, Saeed Bshara <saeedb@...zon.com>, "Wilson, Matt"
	<msw@...zon.com>, "Liguori, Anthony" <aliguori@...zon.com>, "Bshara, Nafea"
	<nafea@...zon.com>, "Belgazal, Netanel" <netanel@...zon.com>, "Saidi, Ali"
	<alisaidi@...zon.com>, "Herrenschmidt, Benjamin" <benh@...zon.com>,
	"Kiyanovski, Arthur" <akiyano@...zon.com>, "Dagan, Noam" <ndagan@...zon.com>,
	"Agroskin, Shay" <shayagr@...zon.com>, "Itzko, Shahar" <itzko@...zon.com>,
	"Abboud, Osama" <osamaabb@...zon.com>, "Ostrovsky, Evgeny"
	<evostrov@...zon.com>, "Tabachnik, Ofir" <ofirt@...zon.com>, "Koler, Nati"
	<nkolder@...zon.com>
Subject: [PATCH v1 net-next 08/11] net: ena: Relocate skb_tx_timestamp() to improve time stamping accuracy

From: David Arinzon <darinzon@...zon.com>

Move skb_tx_timestamp() closer to the actual time the driver sends the
packets to the device.

Signed-off-by: Osama Abboud <osamaabb@...zon.com>
Signed-off-by: David Arinzon <darinzon@...zon.com>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index ae9291b..d4ca406 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2614,8 +2614,6 @@ static netdev_tx_t ena_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (unlikely(rc))
 		goto error_drop_packet;
 
-	skb_tx_timestamp(skb);
-
 	next_to_use = tx_ring->next_to_use;
 	req_id = tx_ring->free_ids[next_to_use];
 	tx_info = &tx_ring->tx_buffer_info[req_id];
@@ -2679,6 +2677,8 @@ static netdev_tx_t ena_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 	}
 
+	skb_tx_timestamp(skb);
+
 	if (netif_xmit_stopped(txq) || !netdev_xmit_more())
 		/* trigger the dma engine. ena_ring_tx_doorbell()
 		 * calls a memory barrier inside it.
-- 
2.40.1