netdev - [PATCH] Enable tx timestamping on loopback and dummy

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Message-ID: <20170311202753.GA26476@u480fcf44e5b8574c5490.ant.amazon.com>
Date:   Sat, 11 Mar 2017 20:28:03 +0000
From:   Ezequiel Lara Gomez <ezegomez@...zon.com>
To:     netdev@...r.kernel.org
Subject: [PATCH] Enable tx timestamping on loopback and dummy

This enables testing of SO_TIMESTAMPING options by targetting localhost
addresses.

Tested on qemu using txtimestamping.c from the kernel selftests.
---
 drivers/net/dummy.c    | 1 +
 drivers/net/loopback.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/net/dummy.c b/drivers/net/dummy.c
index 2c80611..32fdc00 100644
--- a/drivers/net/dummy.c
+++ b/drivers/net/dummy.c
@@ -125,6 +125,7 @@ static netdev_tx_t dummy_xmit(struct sk_buff *skb, struct net_device *dev)
 	dstats->tx_bytes += skb->len;
 	u64_stats_update_end(&dstats->syncp);
 
+	skb_tx_timestamp(skb);
 	dev_kfree_skb(skb);
 	return NETDEV_TX_OK;
 }
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 122cc2d..8bcf479 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -74,6 +74,7 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
 	struct pcpu_lstats *lb_stats;
 	int len;
 
+	skb_tx_timestamp(skb);
 	skb_orphan(skb);
 
 	/* Before queueing this packet to netif_rx(),
-- 
1.9.1

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