On Mon, Dec 19, 2022 at 12:55:55PM -0600, Robert Elliott wrote: > +/** > + * chacha_2block_xor_avx2 - Encrypt 2 blocks using the x86 AVX2 feature set > + * @state: address of input state matrix, s (%rdi) > + * @dst: address of up to 2 data blocks output, o (%rsi) > + * @src: address of up to 2 data blocks input, i (%rdx) > + * @len: input/output length in bytes (%rcx) > + * @nrounds: number of rounds (%r8d) > + * > + * This function encrypts two ChaCha blocks by loading the state > + * matrix twice across four AVX registers. It performs matrix operations > + * on four words in each matrix in parallel, but requires shuffling to > + * rearrange the words after each round. 2 blocks, or up to 2 blocks? What does that mean? > + * > + * Return: none > + * Prototype: asmlinkage void chacha_2block_xor_avx2(u32 *state, u8 *dst, const u8 *src, > + * unsigned int len, int nrounds); When the return type is void, there is no need to write "Return: none". - Eric
