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

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Message-Id: <1354845953-23424-1-git-send-email-joseph.gasparakis@intel.com>
Date:	Thu,  6 Dec 2012 18:05:53 -0800
From:	Joseph Gasparakis <joseph.gasparakis@...el.com>
To:	davem@...emloft.net, shemminger@...tta.com, chrisw@...s-sol.org,
	gospo@...hat.com
Cc:	Joseph Gasparakis <joseph.gasparakis@...el.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	alexander.h.duyck@...el.com, peter.p.waskiewicz.jr@...el.com
Subject: [PATCH] vxlan: Add capability of Rx checksum offload for inner packet

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@...el.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

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