s390/checksum: provide csum_partial_copy_nocheck()

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With csum_partial(), which reads all bytes into registers it is easy to
also implement csum_partial_copy_nocheck() which copies the buffer while
calculating its checksum.

For a 512 byte buffer this reduces the runtime by 19%. Compared to the old
generic variant (memcpy() + cksm instruction) runtime is reduced by 42%).

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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This commit is contained in:

Heiko Carstens 2024-02-03 11:45:23 +01:00

parent cb2a1dd589

commit dcd3e1de9d

4 changed files with 112 additions and 13 deletions

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3

arch/s390/include/asm/checksum.h

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10

arch/s390/include/asm/fpu-insn-asm.h

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58

arch/s390/include/asm/fpu-insn.h

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54

arch/s390/lib/csum-partial.c

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