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authorJoseph Gasparakis <joseph.gasparakis@intel.com>2012-12-07 14:14:14 +0000
committerDavid S. Miller <davem@davemloft.net>2012-12-09 00:20:28 -0500
commit6a674e9c75b17e7a88ff15b3c2e269eed54f7cfb (patch)
treecff48ec155b5c7d8a595d66cc7dc0216a91f9ec3 /include/linux/ip.h
parent9ecb9aabaf634677c77af467f4e3028b09d7bcda (diff)
net: Add support for hardware-offloaded encapsulation
This patch adds support in the kernel for offloading in the NIC Tx and Rx checksumming for encapsulated packets (such as VXLAN and IP GRE). For Tx encapsulation offload, the driver will need to set the right bits in netdev->hw_enc_features. The protocol driver will have to set the skb->encapsulation bit and populate the inner headers, so the NIC driver will use those inner headers to calculate the csum in hardware. For Rx encapsulation offload, the driver will need to set again the skb->encapsulation flag and the skb->ip_csum to CHECKSUM_UNNECESSARY. In that case the protocol driver should push the decapsulated packet up to the stack, again with CHECKSUM_UNNECESSARY. In ether case, the protocol driver should set the skb->encapsulation flag back to zero. Finally the protocol driver should have NETIF_F_RXCSUM flag set in its features. Signed-off-by: Joseph Gasparakis <joseph.gasparakis@intel.com> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/ip.h')
-rw-r--r--include/linux/ip.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/ip.h b/include/linux/ip.h
index 58b82a22a52b..492bc6513533 100644
--- a/include/linux/ip.h
+++ b/include/linux/ip.h
@@ -25,6 +25,11 @@ static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
return (struct iphdr *)skb_network_header(skb);
}
+static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
+{
+ return (struct iphdr *)skb_inner_network_header(skb);
+}
+
static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
{
return (struct iphdr *)skb_transport_header(skb);