Improve the performance of NEON based ChaCha: Patch #1 adds a block size of 1472 to the tcrypt test template so we have something that reflects the VPN case.
Patch #2 improves performance for arbitrary length inputs: on deep pipelines, throughput increases ~30% when running on inputs blocks whose size is drawn randomly from the interval [64, 1024) Patch #3 adopts the OpenSSL approach to use the ALU in parallel with the SIMD unit to process a fifth block while the SIMD is operating on 4 blocks. Performance on Cortex-A57: BEFORE: ======= testing speed of async chacha20 (chacha20-neon) encryption tcrypt: test 0 (256 bit key, 16 byte blocks): 2528223 operations in 1 seconds (40451568 bytes) tcrypt: test 1 (256 bit key, 64 byte blocks): 2518155 operations in 1 seconds (161161920 bytes) tcrypt: test 2 (256 bit key, 256 byte blocks): 1207948 operations in 1 seconds (309234688 bytes) tcrypt: test 3 (256 bit key, 1024 byte blocks): 332194 operations in 1 seconds (340166656 bytes) tcrypt: test 4 (256 bit key, 1472 byte blocks): 185659 operations in 1 seconds (273290048 bytes) tcrypt: test 5 (256 bit key, 8192 byte blocks): 41829 operations in 1 seconds (342663168 bytes) AFTER: ====== testing speed of async chacha20 (chacha20-neon) encryption tcrypt: test 0 (256 bit key, 16 byte blocks): 2530018 operations in 1 seconds (40480288 bytes) tcrypt: test 1 (256 bit key, 64 byte blocks): 2518270 operations in 1 seconds (161169280 bytes) tcrypt: test 2 (256 bit key, 256 byte blocks): 1187760 operations in 1 seconds (304066560 bytes) tcrypt: test 3 (256 bit key, 1024 byte blocks): 361652 operations in 1 seconds (370331648 bytes) tcrypt: test 4 (256 bit key, 1472 byte blocks): 280971 operations in 1 seconds (413589312 bytes) tcrypt: test 5 (256 bit key, 8192 byte blocks): 53654 operations in 1 seconds (439533568 bytes) Zinc: ===== testing speed of async chacha20 (chacha20-software) encryption tcrypt: test 0 (256 bit key, 16 byte blocks): 2510300 operations in 1 seconds (40164800 bytes) tcrypt: test 1 (256 bit key, 64 byte blocks): 2663794 operations in 1 seconds (170482816 bytes) tcrypt: test 2 (256 bit key, 256 byte blocks): 1237617 operations in 1 seconds (316829952 bytes) tcrypt: test 3 (256 bit key, 1024 byte blocks): 364645 operations in 1 seconds (373396480 bytes) tcrypt: test 4 (256 bit key, 1472 byte blocks): 251548 operations in 1 seconds (370278656 bytes) tcrypt: test 5 (256 bit key, 8192 byte blocks): 47650 operations in 1 seconds (390348800 bytes) Cc: Eric Biggers <ebigg...@kernel.org> Cc: Martin Willi <mar...@strongswan.org> Ard Biesheuvel (3): crypto: tcrypt - add block size of 1472 to skcipher template crypto: arm64/chacha - optimize for arbitrary length inputs crypto: arm64/chacha - use combined SIMD/ALU routine for more speed arch/arm64/crypto/chacha-neon-core.S | 396 +++++++++++++++++++- arch/arm64/crypto/chacha-neon-glue.c | 59 ++- crypto/tcrypt.c | 2 +- 3 files changed, 404 insertions(+), 53 deletions(-) -- 2.19.2
