[PATCH] Enable tx timestamping on loopback and dummy

[Ezequiel Lara Gomez]

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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