datapath: Enable tunnel GSO features.

Following patch enables all available tunnel GSO features for OVS
bridge device so that ovs can use hardware offloads available to
underling device.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Andy Zhou <azhou@nicira.com>

datapath/linux/compat/include/linux/netdev_features.h

@@ -9,4 +9,46 @@
 #define NETIF_F_HW_VLAN_CTAG_TX NETIF_F_HW_VLAN_TX
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,8,0)
+#define NETIF_F_GSO_ENCAP_ALL	 0
+
+#else
+
+#ifndef NETIF_F_GSO_GRE
+#define NETIF_F_GSO_GRE 0
+#endif
+
+#ifndef NETIF_F_GSO_GRE_CSUM
+#define NETIF_F_GSO_GRE_CSUM 0
+#endif
+
+#ifndef NETIF_F_GSO_IPIP
+#define NETIF_F_GSO_IPIP 0
+#endif
+
+#ifndef NETIF_F_GSO_SIT
+#define NETIF_F_GSO_SIT 0
+#endif
+
+#ifndef NETIF_F_GSO_UDP_TUNNEL
+#define NETIF_F_GSO_UDP_TUNNEL 0
+#endif
+
+#ifndef NETIF_F_GSO_UDP_TUNNEL_CSUM
+#define NETIF_F_GSO_UDP_TUNNEL_CSUM 0
+#endif
+
+#ifndef NETIF_F_GSO_MPLS
+#define NETIF_F_GSO_MPLS 0
+#endif
+
+#define NETIF_F_GSO_ENCAP_ALL	(NETIF_F_GSO_GRE |			\
+				 NETIF_F_GSO_GRE_CSUM |			\
+				 NETIF_F_GSO_IPIP |			\
+				 NETIF_F_GSO_SIT |			\
+				 NETIF_F_GSO_UDP_TUNNEL |		\
+				 NETIF_F_GSO_UDP_TUNNEL_CSUM |		\
+				 NETIF_F_GSO_MPLS)
+#endif
+
 #endif

datapath/linux/compat/include/net/gre.h

@@ -103,6 +103,17 @@ static inline int ip_gre_calc_hlen(__be16 o_flags)
 		addend += 4;
 	return addend;
 }
+#else
+static inline struct sk_buff *rpl_gre_handle_offloads(struct sk_buff *skb,
+						  bool gre_csum)
+{
+	if (skb->encapsulation && skb_is_gso(skb)) {
+		kfree_skb(skb);
+		return ERR_PTR(-ENOSYS);
+	}
+	return gre_handle_offloads(skb, gre_csum);
+}
+#define gre_handle_offloads rpl_gre_handle_offloads
 #endif
 
 #endif

datapath/linux/compat/include/net/vxlan.h

@@ -8,6 +8,22 @@
 #include <linux/version.h>
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0)
 #include_next <net/vxlan.h>
+
+static inline int rpl_vxlan_xmit_skb(struct vxlan_sock *vs,
+                   struct rtable *rt, struct sk_buff *skb,
+                   __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
+                   __be16 src_port, __be16 dst_port, __be32 vni)
+{
+	if (skb->encapsulation && skb_is_gso(skb)) {
+		kfree_skb(skb);
+		return -ENOSYS;
+	}
+
+	return vxlan_xmit_skb(vs, rt, skb, src, dst, tos, ttl, df,
+			      src_port, dst_port, vni);
+}
+
+#define vxlan_xmit_skb rpl_vxlan_xmit_skb
 #else
 
 struct vxlan_sock;

datapath/vport-internal_dev.c

@@ -155,14 +155,20 @@ static void do_setup(struct net_device *netdev)
 	netdev->tx_queue_len = 0;
 
 	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
-			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
+			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
+			   NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
 
 	netdev->vlan_features = netdev->features;
 	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
 	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 #endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
+	netdev->hw_enc_features = netdev->features;
+#endif
+
 	eth_hw_addr_random(netdev);
 }
 

datapath/vport-lisp.c

@@ -402,6 +402,11 @@ static int handle_offloads(struct sk_buff *skb)
 #else
 static int handle_offloads(struct sk_buff *skb)
 {
+	if (skb->encapsulation && skb_is_gso(skb)) {
+		kfree_skb(skb);
+		return -ENOSYS;
+	}
+
 	if (skb_is_gso(skb)) {
 		int err = skb_unclone(skb, GFP_ATOMIC);
 		if (unlikely(err))