gre: Call gso_make_checksum

Call gso_make_checksum. This should have the benefit of using a
checksum that may have been previously computed for the packet.

This also adds NETIF_F_GSO_GRE_CSUM to differentiate devices that
offload GRE GSO with and without the GRE checksum offloaed.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 79da8b305ced..0ae3d98f83e0 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -65,6 +65,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
                                       SKB_GSO_UDP_TUNNEL |
                                       SKB_GSO_UDP_TUNNEL_CSUM |
                                       SKB_GSO_GRE |
+                                      SKB_GSO_GRE_CSUM |
                                       SKB_GSO_IPIP |
                                       SKB_GSO_SIT |
                                       SKB_GSO_MPLS) ||