On Tue, Sep 12, 2023 at 01:57:28PM +0200, Björn Töpel wrote: > From: Björn Töpel <bjorn@xxxxxxxxxxxx> > > BLAKE2s is used in various places, most notably in Wireguard, and as > of v5.17 in drivers/char/random. > > Add a BLAKE2s implementation using the V-extension. This is a > translation of the x86-64 AVX512 variant > (arch/x86/crypto/blake2s-core.S) to the RISC-V V-extension. > > The AVX512 variant requires registers >= 256b (ymm*), and hence this > implementation requires a VLEN of >=256. > > The implementation passes the kernel BLAKE2s selftest, and has been > tested on spike and qemu. > > Instruction-wise, the V-variant uses 60% less instructions than the > generic, C-based, implementation. > > Signed-off-by: Björn Töpel <bjorn@xxxxxxxxxxxx> > arch/riscv/crypto/blake2s-v.S | 164 +++++++++++++++++++++++++++++++ This file is currently being built for !RISCV_ISA_V, leading to build errors for obvious reasons. Eg: ../arch/riscv/crypto/blake2s-v.S:62:2: error: instruction requires the following: 'V' (Vector Extension for Application Processors), 'Zve32x' or 'Zve64x' (Vector Extensions for Embedded Processors)
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