From 4749c09c37030ccdc44aecebe0f71b02a377fc14 Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Wed, 4 Jun 2014 17:20:23 -0700 Subject: gre: Call gso_make_checksum Call gso_make_checksum. This should have the benefit of using a checksum that may have been previously computed for the packet. This also adds NETIF_F_GSO_GRE_CSUM to differentiate devices that offload GRE GSO with and without the GRE checksum offloaed. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- net/ipv4/gre_offload.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'net/ipv4/gre_offload.c') diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c index f1d32280cb54..24deb3928b9e 100644 --- a/net/ipv4/gre_offload.c +++ b/net/ipv4/gre_offload.c @@ -42,6 +42,7 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb, SKB_GSO_DODGY | SKB_GSO_TCP_ECN | SKB_GSO_GRE | + SKB_GSO_GRE_CSUM | SKB_GSO_IPIP))) goto out; @@ -55,6 +56,8 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb, goto out; csum = !!(greh->flags & GRE_CSUM); + if (csum) + skb->encap_hdr_csum = 1; if (unlikely(!pskb_may_pull(skb, ghl))) goto out; @@ -94,10 +97,13 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb, } } - greh = (struct gre_base_hdr *)(skb->data); + skb_reset_transport_header(skb); + + greh = (struct gre_base_hdr *) + skb_transport_header(skb); pcsum = (__be32 *)(greh + 1); *pcsum = 0; - *(__sum16 *)pcsum = csum_fold(skb_checksum(skb, 0, skb->len, 0)); + *(__sum16 *)pcsum = gso_make_checksum(skb, 0); } __skb_push(skb, tnl_hlen - ghl); -- cgit v1.2.3