net: optimise inet_proto_csum_replace4()
csum_partial() is a generic function which is not optimised for small fixed length calculations, and its use requires to store "from" and "to" values in memory while we already have them available in registers. This also has impact, especially on RISC processors. In the same spirit as the change done by Eric Dumazet on csum_replace2(), this patch rewrites inet_proto_csum_replace4() taking into account RFC1624. I spotted during a NATted tcp transfert that csum_partial() is one of top 5 consuming functions (around 8%), and the second user of csum_partial() is inet_proto_csum_replace4(). Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
4565af0d40
Коммит
58e3cac561
|
@ -306,16 +306,14 @@ EXPORT_SYMBOL(in6_pton);
|
|||
void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
|
||||
__be32 from, __be32 to, int pseudohdr)
|
||||
{
|
||||
__be32 diff[] = { ~from, to };
|
||||
if (skb->ip_summed != CHECKSUM_PARTIAL) {
|
||||
*sum = csum_fold(csum_partial(diff, sizeof(diff),
|
||||
~csum_unfold(*sum)));
|
||||
*sum = csum_fold(csum_add(csum_sub(~csum_unfold(*sum), from),
|
||||
to));
|
||||
if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
|
||||
skb->csum = ~csum_partial(diff, sizeof(diff),
|
||||
~skb->csum);
|
||||
skb->csum = ~csum_add(csum_sub(~(skb->csum), from), to);
|
||||
} else if (pseudohdr)
|
||||
*sum = ~csum_fold(csum_partial(diff, sizeof(diff),
|
||||
csum_unfold(*sum)));
|
||||
*sum = ~csum_fold(csum_add(csum_sub(csum_unfold(*sum), from),
|
||||
to));
|
||||
}
|
||||
EXPORT_SYMBOL(inet_proto_csum_replace4);
|
||||
|
||||
|
|
Загрузка…
Ссылка в новой задаче