[PATCH] vxlan: Add capability of Rx checksum offload for inner packet

[Joseph Gasparakis <joseph.gasparakis@intel.com>]

This patch adds capability in vxlan to identify received
checksummed inner packets and signal them to the upper layers of
the stack. The driver needs to set the skb->encapsulation bit
and also set the skb->ip_summed to CHECKSUM_UNNECESSARY.

Signed-off-by: Joseph Gasparakis <joseph.gasparakis@intel.com>
---
 drivers/net/vxlan.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 88b31f2..cf0231d 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -607,7 +607,12 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 
 	__skb_tunnel_rx(skb, vxlan->dev);
 	skb_reset_network_header(skb);
-	skb->ip_summed = CHECKSUM_NONE;
+
+	if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
+	    !(vxlan->dev->features & NETIF_F_RXCSUM))
+		skb->ip_summed = CHECKSUM_NONE;
+
+	skb->encapsulation = 0;
 
 	err = IP_ECN_decapsulate(oip, skb);
 	if (unlikely(err)) {
@@ -1175,7 +1180,9 @@ static void vxlan_setup(struct net_device *dev)
 	dev->features	|= NETIF_F_LLTX;
 	dev->features	|= NETIF_F_NETNS_LOCAL;
 	dev->features	|= NETIF_F_SG | NETIF_F_HW_CSUM;
-	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+	dev->features   |= NETIF_F_RXCSUM;
+
+	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
 	dev->priv_flags	&= ~IFF_XMIT_DST_RELEASE;
 
 	spin_lock_init(&vxlan->hash_lock);
-- 
1.7.6.4