tunneling: Add generic Tunnel segmentation.

Adds generic tunneling offloading support for IPv4-UDP based
tunnels.
GSO type is added to request this offload for a skb.
netdev feature NETIF_F_UDP_TUNNEL is added for hardware offloaded
udp-tunnel support. Currently no device supports this feature,
software offload is used.

This can be used by tunneling protocols like VXLAN.

CC: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 3dd39340430e..f5e797c0c2a4 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -42,9 +42,9 @@ enum {
         NETIF_F_TSO6_BIT,               /* ... TCPv6 segmentation */
         NETIF_F_FSO_BIT,                /* ... FCoE segmentation */
         NETIF_F_GSO_GRE_BIT,            /* ... GRE with TSO */
-        /**/NETIF_F_GSO_LAST,           /* [can't be last bit, see GSO_MASK] */
-        NETIF_F_GSO_RESERVED2           /* ... free (fill GSO_MASK to 8 bits) */
-                = NETIF_F_GSO_LAST,
+        NETIF_F_GSO_UDP_TUNNEL_BIT,     /* ... UDP TUNNEL with TSO */
+        /**/NETIF_F_GSO_LAST =          /* last bit, see GSO_MASK */
+                NETIF_F_GSO_UDP_TUNNEL_BIT,
 
         NETIF_F_FCOE_CRC_BIT,           /* FCoE CRC32 */
         NETIF_F_SCTP_CSUM_BIT,          /* SCTP checksum offload */
@@ -103,6 +103,7 @@ enum {
 #define NETIF_F_RXFCS           __NETIF_F(RXFCS)
 #define NETIF_F_RXALL           __NETIF_F(RXALL)
 #define NETIF_F_GRE_GSO         __NETIF_F(GSO_GRE)
+#define NETIF_F_UDP_TUNNEL      __NETIF_F(UDP_TUNNEL)
 
 /* Features valid for ethtool to change */
 /* = all defined minus driver/device-class-related */