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Merge branch 'net-small-csum-optimizations'

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Eric Dumazet says:

====================
net: small csum optimizations

After recent x86 csum_partial() optimizations, we can more easily
see in kernel profiles costs of add/adc operations that could
be avoided, by feeding a non zero third argument to csum_partial()
====================

Link: https://lore.kernel.org/r/20211124202446.2917972-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2021-11-25 21:03:33 -08:00
commit 35bf8c86ee
2 changed files with 7 additions and 3 deletions
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6
include/linux/skbuff.h
View File

@ -3485,7 +3485,11 @@ __skb_postpull_rcsum(struct sk_buff *skb, const void *start, unsigned int len,
static inline void skb_postpull_rcsum(struct sk_buff *skb,
const void *start, unsigned int len)
{
__skb_postpull_rcsum(skb, start, len, 0);
if (skb->ip_summed == CHECKSUM_COMPLETE)
skb->csum = ~csum_partial(start, len, ~skb->csum);
else if (skb->ip_summed == CHECKSUM_PARTIAL &&
skb_checksum_start_offset(skb) < 0)
skb->ip_summed = CHECKSUM_NONE;
}
static __always_inline void

4
include/net/gro.h
View File

@ -173,8 +173,8 @@ static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
const void *start, unsigned int len)
{
if (NAPI_GRO_CB(skb)->csum_valid)
NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
csum_partial(start, len, 0));
NAPI_GRO_CB(skb)->csum = ~csum_partial(start, len,
~NAPI_GRO_CB(skb)->csum);
}
/* GRO checksum functions. These are logical equivalents of the normal