2 Commits

Author	SHA1	Message	Date
Heiko Carstens	39d02827ed	s390/crypto: fix compile error for ChaCha20 module ... The clgfi instruction used within the ChaCha20 assembly is only available for z9-109 and newer machines, and therefore this will generate a compile error if compiled e.g. with MARCH_Z900. Given that the assembler code will only be executed on machines with vector instructions, which became much later available than z9-109, use insn notation to generate the clgfi instruction, and avoid compile errors due to unknown instructions. Fixes: b087dfab4d39 ("s390/crypto: add SIMD implementation for ChaCha20") Reported-by: kernel test robot <lkp@intel.com> Reviewed-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>	2021-12-20 10:21:55 +01:00
Patrick Steuer	b087dfab4d	s390/crypto: add SIMD implementation for ChaCha20 ... Add an implementation of the ChaCha20 stream cipher (see e.g. RFC 7539) that makes use of z13's vector instruction set extension. The original implementation is by Andy Polyakov which is adapted for kernel use. Four to six blocks are processed in parallel resulting in a performance gain for inputs >= 256 bytes. chacha20-generic 1 operation in 622 cycles (256 bytes) 1 operation in 2346 cycles (1024 bytes) chacha20-s390 1 operation in 218 cycles (256 bytes) 1 operation in 647 cycles (1024 bytes) Cc: Andy Polyakov <appro@openssl.org> Reviewed-by: Harald Freudenberger <freude@de.ibm.com> Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>	2021-12-06 14:42:24 +01:00