netdev - [PATCH net-next v2] net: thunder: make tx software timestamp independent

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Message-Id: <20250508034433.14408-1-kerneljasonxing@gmail.com>
Date: Thu,  8 May 2025 11:44:33 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	sgoutham@...vell.com,
	andrew+netdev@...n.ch,
	willemb@...gle.com
Cc: linux-arm-kernel@...ts.infradead.org,
	netdev@...r.kernel.org,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next v2] net: thunder: make tx software timestamp independent

From: Jason Xing <kernelxing@...cent.com>

skb_tx_timestamp() is used for tx software timestamp enabled by
SOF_TIMESTAMPING_TX_SOFTWARE while SKBTX_HW_TSTAMP is used for
SOF_TIMESTAMPING_TX_HARDWARE. As it clearly shows they are different
timestamps in two dimensions, it's not appropriate to group these two
together in the if-statement.

This patch completes three things:
1. make the software one standalone. Users are able to set both
timestamps together with SOF_TIMESTAMPING_OPT_TX_SWHW flag.
2. make the software one generated after the hardware timestamp logic to
avoid generating sw and hw timestamps at one time without
SOF_TIMESTAMPING_OPT_TX_SWHW being set.
3. move the software timestamp call as close to the door bell.

Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
v2
Link: https://lore.kernel.org/all/20250507030804.70273-1-kerneljasonxing@gmail.com/
The main logic of this patch came out of previous discussion with
Willem, just as the content of this patch says.
---
 drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index 06397cc8bb36..5211759bfe47 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -1389,11 +1389,9 @@ nicvf_sq_add_hdr_subdesc(struct nicvf *nic, struct snd_queue *sq, int qentry,
 		this_cpu_inc(nic->pnicvf->drv_stats->tx_tso);
 	}
 
-	/* Check if timestamp is requested */
-	if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
-		skb_tx_timestamp(skb);
+	/* Check if hw timestamp is requested */
+	if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 		return;
-	}
 
 	/* Tx timestamping not supported along with TSO, so ignore request */
 	if (skb_shinfo(skb)->gso_size)
@@ -1472,6 +1470,8 @@ static inline void nicvf_sq_doorbell(struct nicvf *nic, struct sk_buff *skb,
 
 	netdev_tx_sent_queue(txq, skb->len);
 
+	skb_tx_timestamp(skb);
+
 	/* make sure all memory stores are done before ringing doorbell */
 	smp_wmb();
 
-- 
2.43.5