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net: core: Use csum_replace_by_diff() and csum_sub() instead of opencoding

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Open coded calculation can be avoided and replaced by the
equivalent csum_replace_by_diff() and csum_sub().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christophe Leroy 2022-02-18 09:03:48 +01:00 • committed by David S. Miller
parent adfb62dbda
commit 0f6938eb2e
1 changed files with 2 additions and 2 deletions
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4
net/core/utils.c
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@ -476,9 +476,9 @@ void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb,
__wsum diff, bool pseudohdr)
{
if (skb->ip_summed != CHECKSUM_PARTIAL) {
*sum = csum_fold(csum_add(diff, ~csum_unfold(*sum)));
csum_replace_by_diff(sum, diff);
if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
skb->csum = ~csum_add(diff, ~skb->csum);
skb->csum = ~csum_sub(diff, skb->csum);
} else if (pseudohdr) {
*sum = ~csum_fold(csum_add(diff, csum_unfold(*sum)));
}