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net: add skb functions to process remote checksum offload

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This patch adds skb_remcsum_process and skb_gro_remcsum_process to
perform the appropriate adjustments to the skb when receiving
remote checksum offload.

Updated vxlan and gue to use these functions.

Tested: Ran TCP_RR and TCP_STREAM netperf for VXLAN and GUE, did
not see any change in performance.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2015-02-02 16:07:34 -08:00
committed by David S. Miller
parent 9a05dde59a
commit dcdc899469
4 changed files with 40 additions and 32 deletions
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18
drivers/net/vxlan.c
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@@ -558,7 +558,6 @@ static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
u32 data)
{
size_t start, offset, plen;
__wsum delta;
if (skb->remcsum_offload)
return vh;
@@ -580,12 +579,7 @@ static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
return NULL;
}
delta = remcsum_adjust((void *)vh + hdrlen,
NAPI_GRO_CB(skb)->csum, start, offset);
/* Adjust skb->csum since we changed the packet */
skb->csum = csum_add(skb->csum, delta);
NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
skb_gro_remcsum_process(skb, (void *)vh + hdrlen, start, offset);
skb->remcsum_offload = 1;
@@ -1159,7 +1153,6 @@ static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
size_t hdrlen, u32 data)
{
size_t start, offset, plen;
__wsum delta;
if (skb->remcsum_offload) {
/* Already processed in GRO path */
@@ -1179,14 +1172,7 @@ static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE))
__skb_checksum_complete(skb);
delta = remcsum_adjust((void *)vh + hdrlen,
skb->csum, start, offset);
/* Adjust skb->csum since we changed the packet */
skb->csum = csum_add(skb->csum, delta);
skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset);
return vh;
}