gre: add GSO support

Add GSO support to GRE tunnels.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index b062a98574f2..f233c1da2077 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -745,6 +745,10 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
         __be32 dst;
         int    mtu;
 
+        if (skb->ip_summed == CHECKSUM_PARTIAL &&
+            skb_checksum_help(skb))
+                goto tx_error;
+
         if (dev->type == ARPHRD_ETHER)
                 IPCB(skb)->flags = 0;
 
@@ -1296,6 +1300,11 @@ static void ipgre_dev_free(struct net_device *dev)
         free_netdev(dev);
 }
 
+#define GRE_FEATURES (NETIF_F_SG |              \
+                      NETIF_F_FRAGLIST |        \
+                      NETIF_F_HIGHDMA |         \
+                      NETIF_F_HW_CSUM)
+
 static void ipgre_tunnel_setup(struct net_device *dev)
 {
         dev->netdev_ops         = &ipgre_netdev_ops;
@@ -1309,6 +1318,9 @@ static void ipgre_tunnel_setup(struct net_device *dev)
         dev->addr_len           = 4;
         dev->features           |= NETIF_F_NETNS_LOCAL;
         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
+
+        dev->features           |= GRE_FEATURES;
+        dev->hw_features        |= GRE_FEATURES;
 }
 
 static int ipgre_tunnel_init(struct net_device *dev)