ipv6: Do not treat a GSO_TCPV4 request from UDP tunnel over IPv6 as invalid

This patch adds SKB_GSO_TCPV4 to the list of supported GSO types handled by
the IPv6 GSO offloads.  Without this change VXLAN tunnels running over IPv6
do not currently handle IPv4 TCP TSO requests correctly and end up handing
the non-segmented frame off to the device.

Below is the before and after for a simple netperf TCP_STREAM test between
two endpoints tunneling IPv4 over a VXLAN tunnel running on IPv6 on top of
a 1Gb/s network adapter.

Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 87380  16384  16384    10.29       0.88      Before
 87380  16384  16384    10.03     895.69      After

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index a071563a7e6e9c1f6d0fa9d8490c1d35ce89b3f7..01e12d0d8fcc9284403629fd17d7de010463d480 100644 (file)
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -69,7 +69,8 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
        int nhoff;
 
        if (unlikely(skb_shinfo(skb)->gso_type &
-                    ~(SKB_GSO_UDP |
+                    ~(SKB_GSO_TCPV4 |
+                      SKB_GSO_UDP |
                       SKB_GSO_DODGY |
                       SKB_GSO_TCP_ECN |
                       SKB_GSO_GRE |