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Commit 53936107 authored by Edward Cree's avatar Edward Cree Committed by David S. Miller
Browse files

net: gre: Implement LCO for GRE over IPv4 



Signed-off-by: default avatarEdward Cree <ecree@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 06f62292

net/ipv4/ip_gre.c

+13 −3
Original line number Diff line number Diff line
@@ -440,6 +440,17 @@ static int gre_rcv(struct sk_buff *skb) 
	return 0;

}



static __sum16 gre_checksum(struct sk_buff *skb)

{

	__wsum csum;



	if (skb->ip_summed == CHECKSUM_PARTIAL)

		csum = lco_csum(skb);

	else

		csum = skb_checksum(skb, 0, skb->len, 0);

	return csum_fold(csum);

}



static void build_header(struct sk_buff *skb, int hdr_len, __be16 flags,

			 __be16 proto, __be32 key, __be32 seq)

{
@@ -467,8 +478,7 @@ static void build_header(struct sk_buff *skb, int hdr_len, __be16 flags, 
		    !(skb_shinfo(skb)->gso_type &

		      (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {

			*ptr = 0;

			*(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0,

								 skb->len, 0));

			*(__sum16 *)ptr = gre_checksum(skb);

		}

	}

}
@@ -493,7 +503,7 @@ static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, 
static struct sk_buff *gre_handle_offloads(struct sk_buff *skb,

					   bool csum)

{

	return iptunnel_handle_offloads(skb, csum,

	return iptunnel_handle_offloads(skb, false,

					csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);

}