ipip: add GSO support

In commit 6b78f16e4b (gre: add GSO support) we added GSO support to GRE
tunnels.

This patch does the same for IPIP tunnels.

Performance of single TCP flow over an IPIP tunnel is increased by 40%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Maciej Żenczykowski <maze@google.com>
Cc: Tom Herbert <therbert@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index e15b45297c09f0043bda21ad366ce36d5a6e5824..cc49cc1ff3b97f5d6b63892ef86232b049ff37e1 100644 (file)
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -479,6 +479,10 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
        if (skb->protocol != htons(ETH_P_IP))
                goto tx_error;
 
+       if (skb->ip_summed == CHECKSUM_PARTIAL &&
+           skb_checksum_help(skb))
+               goto tx_error;
+
        if (tos & 1)
                tos = old_iph->tos;
 
@@ -773,6 +777,11 @@ static void ipip_dev_free(struct net_device *dev)
        free_netdev(dev);
 }
 
+#define IPIP_FEATURES (NETIF_F_SG |            \
+                      NETIF_F_FRAGLIST |       \
+                      NETIF_F_HIGHDMA |        \
+                      NETIF_F_HW_CSUM)
+
 static void ipip_tunnel_setup(struct net_device *dev)
 {
        dev->netdev_ops         = &ipip_netdev_ops;
@@ -787,6 +796,9 @@ static void ipip_tunnel_setup(struct net_device *dev)
        dev->features           |= NETIF_F_NETNS_LOCAL;
        dev->features           |= NETIF_F_LLTX;
        dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
+
+       dev->features           |= IPIP_FEATURES;
+       dev->hw_features        |= IPIP_FEATURES;
 }
 
 static int ipip_tunnel_init(struct net_device *dev)