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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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15
include/linux/netdevice.h
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@@ -2318,6 +2318,21 @@ do { \
compute_pseudo(skb, proto)); \
} while (0)
static inline void skb_gro_remcsum_process(struct sk_buff *skb, void *ptr,
int start, int offset)
{
__wsum delta;
BUG_ON(!NAPI_GRO_CB(skb)->csum_valid);
delta = remcsum_adjust(ptr, 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);
}
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type,
const void *daddr, const void *saddr,