net: atlantic: generate software timestamp just before the doorbell

JIRA: https://issues.redhat.com/browse/RHEL-105363

commit 285ad74
Author: Jason Xing <kernelxing@tencent.com>
Date:   Sat May 10 21:48:10 2025 +0800

    net: atlantic: generate software timestamp just before the doorbell

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

    Signed-off-by: Jason Xing <kernelxing@tencent.com>
    Link: https://patch.msgid.link/20250510134812.48199-2-kerneljasonxing@gmail.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Izabela Bakollari <ibakolla@redhat.com>

Author: Izabela Bakollari

drivers/net/ethernet/aquantia/atlantic/aq_main.c

@@ -123,7 +123,6 @@ static netdev_tx_t aq_ndev_start_xmit(struct sk_buff *skb, struct net_device *nd
 	}
 #endif
 
-	skb_tx_timestamp(skb);
 	return aq_nic_xmit(aq_nic, skb);
 }
 

drivers/net/ethernet/aquantia/atlantic/aq_nic.c

@@ -898,6 +898,8 @@ int aq_nic_xmit(struct aq_nic_s *self, struct sk_buff *skb)
 
 	frags = aq_nic_map_skb(self, skb, ring);
 
+	skb_tx_timestamp(skb);
+
 	if (likely(frags)) {
 		err = self->aq_hw_ops->hw_ring_tx_xmit(self->aq_hw,
 						       ring, frags);