net: restore tx timestamping for accelerated vlans

[ Upstream commit 81bbb3d4048cf577b5babcb0834230de391a35c5 ]

Since commit 9b22ea560957de1484e6b3e8538f7eef202e3596
( net: fix packet socket delivery in rx irq handler )

We lost rx timestamping of packets received on accelerated vlans.

Effect is that tcpdump on real dev can show strange timings, since it gets rx timestamps
too late (ie at skb dequeueing time, not at skb queueing time)

14:47:26.986871 IP 192.168.20.110 > 192.168.20.141: icmp 64: echo request seq 1
14:47:26.986786 IP 192.168.20.141 > 192.168.20.110: icmp 64: echo reply seq 1

14:47:27.986888 IP 192.168.20.110 > 192.168.20.141: icmp 64: echo request seq 2
14:47:27.986781 IP 192.168.20.141 > 192.168.20.110: icmp 64: echo reply seq 2

14:47:28.986896 IP 192.168.20.110 > 192.168.20.141: icmp 64: echo request seq 3
14:47:28.986780 IP 192.168.20.141 > 192.168.20.110: icmp 64: echo reply seq 3

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/core/dev.c b/net/core/dev.c
index 6a94475aee8594279eb90d94cc164c5169e533c5..a2f575b5b0512769759879ce08d7f45c502b4bf3 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2248,6 +2248,9 @@ int netif_receive_skb(struct sk_buff *skb)
        int ret = NET_RX_DROP;
        __be16 type;
 
+       if (!skb->tstamp.tv64)
+               net_timestamp(skb);
+
        if (skb->vlan_tci && vlan_hwaccel_do_receive(skb))
                return NET_RX_SUCCESS;
 
@@ -2255,9 +2258,6 @@ int netif_receive_skb(struct sk_buff *skb)
        if (netpoll_receive_skb(skb))
                return NET_RX_DROP;
 
-       if (!skb->tstamp.tv64)
-               net_timestamp(skb);
-
        if (!skb->iif)
                skb->iif = skb->dev->ifindex;