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s390/checksum: make ip_fast_csum() faster

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Convert ip_fast_csum() so it doesn't call csum_partial(), but instead
open code the checksum calculation. The problem with csum_partial() is
that it makes use of the cksm instruction, which has high startup
costs and therefore is only very fast if used on larger memory
regions.

IPv4 headers however are small in size (5-16 32-bit words). The open
coded variant calculates the checksum in ~30% of the time compared to
the old variant (z14, march=z196).

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-08-11 16:36:26 +02:00 committed by Vasily Gorbik
parent bb4644b14a
commit 614b4f5d0f
1 changed files with 12 additions and 1 deletions
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13
arch/s390/include/asm/checksum.h
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@ -66,7 +66,18 @@ static inline __sum16 csum_fold(__wsum sum)
*/
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
return csum_fold(csum_partial(iph, ihl*4, 0));
__u64 csum = 0;
__u32 *ptr = (u32 *)iph;
csum += *ptr++;
csum += *ptr++;
csum += *ptr++;
csum += *ptr++;
ihl -= 4;
while (ihl--)
csum += *ptr++;
csum += (csum >> 32) | (csum << 32);
return csum_fold((__force __wsum)(csum >> 32));
}
/*