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net: gre: Implement LCO for GRE over IPv4 

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2016-02-11 21:01:07 +00:00 committed by David S. Miller
parent 06f622926d
commit 53936107ba
1 changed files with 13 additions and 3 deletions
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16
net/ipv4/ip_gre.c
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@ -440,6 +440,17 @@ drop:
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);
}