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net: stmmac: generate software timestamp just before the doorbell

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Make sure the call of skb_tx_timestamp is as close as possbile to the
doorbell.

The patch also adjusts the order of setting SKBTX_IN_PROGRESS and
generate software timestamp so that without SOF_TIMESTAMPING_OPT_TX_SWHW
being set the software and hardware timestamps will not appear in the
error queue of socket nearly at the same time (Please see __skb_tstamp_tx()).

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Link: https://patch.msgid.link/20250510134812.48199-4-kerneljasonxing@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jason Xing
2025-05-10 21:48:12 +08:00
committed by Jakub Kicinski
parent aaed2789b3
commit 33d4cc81fc
1 changed files with 2 additions and 5 deletions
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7
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@@ -4497,8 +4497,6 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
if (priv->sarc_type)
stmmac_set_desc_sarc(priv, first, priv->sarc_type);
skb_tx_timestamp(skb);
if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
priv->hwts_tx_en)) {
/* declare that device is doing timestamping */
@@ -4531,6 +4529,7 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
}
netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
skb_tx_timestamp(skb);
stmmac_flush_tx_descriptors(priv, queue);
stmmac_tx_timer_arm(priv, queue);
@@ -4774,8 +4773,6 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
if (priv->sarc_type)
stmmac_set_desc_sarc(priv, first, priv->sarc_type);
skb_tx_timestamp(skb);
/* Ready to fill the first descriptor and set the OWN bit w/o any
* problems because all the descriptors are actually ready to be
* passed to the DMA engine.
@@ -4822,7 +4819,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);
skb_tx_timestamp(skb);
stmmac_flush_tx_descriptors(priv, queue);
stmmac_tx_timer_arm(priv, queue);