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

From: Joseph Gasparakis
Date: Thu Dec 06 2012 - 20:57:26 EST


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@xxxxxxxxx>
---
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

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