netdev - [PATCH net-next] net/xen-netfront: add kernel TX timestamps

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Date:   Fri, 3 Jul 2020 01:22:34 -0500
From:   Daniel Drown <dan-netdev@...wn.org>
To:     netdev@...r.kernel.org
Subject: [PATCH net-next] net/xen-netfront: add kernel TX timestamps

This adds kernel TX timestamps to the xen-netfront driver.  Tested with chrony
on an AWS EC2 instance.

Signed-off-by: Daniel Drown <dan-netdev@...wn.org>
---
 drivers/net/xen-netfront.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 860a0cce346d..ed995df19247 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -754,6 +754,9 @@ static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev
 	/* First request has the packet length. */
 	first_tx->size = skb->len;
 
+	/* timestamp packet in software */
+	skb_tx_timestamp(skb);
+
 	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify);
 	if (notify)
 		notify_remote_via_irq(queue->tx_irq);
@@ -2411,6 +2414,7 @@ static const struct ethtool_ops xennet_ethtool_ops =
 	.get_sset_count = xennet_get_sset_count,
 	.get_ethtool_stats = xennet_get_ethtool_stats,
 	.get_strings = xennet_get_strings,
+	.get_ts_info = ethtool_op_get_ts_info,
 };
 
 #ifdef CONFIG_SYSFS
-- 
2.21.3