target/linux/generic/backport-5.4/080-wireguard-0048-crypto-x86-poly1305-emit-does-base-conversion-itself.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Fri, 17 Jan 2020 11:42:22 +0100
   4 Subject: [PATCH] crypto: x86/poly1305 - emit does base conversion itself
   5
   6 commit f9e7fe32a792726186301423ff63a465d63386e1 upstream.
   7
   8 The emit code does optional base conversion itself in assembly, so we
   9 don't need to do that here. Also, neither one of these functions uses
  10 simd instructions, so checking for that doesn't make sense either.
  11
  12 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  13 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
  14 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  15 ---
  16  arch/x86/crypto/poly1305_glue.c | 8 ++------
  17  1 file changed, 2 insertions(+), 6 deletions(-)
  18
  19 --- a/arch/x86/crypto/poly1305_glue.c
  20 +++ b/arch/x86/crypto/poly1305_glue.c
  21 @@ -123,13 +123,9 @@ static void poly1305_simd_blocks(void *c
  22  static void poly1305_simd_emit(void *ctx, u8 mac[POLY1305_DIGEST_SIZE],
  23                                const u32 nonce[4])
  24  {
  25 -       struct poly1305_arch_internal *state = ctx;
  26 -
  27 -       if (!IS_ENABLED(CONFIG_AS_AVX) || !static_branch_likely(&poly1305_use_avx) ||
  28 -           !state->is_base2_26 || !crypto_simd_usable()) {
  29 -               convert_to_base2_64(ctx);
  30 +       if (!IS_ENABLED(CONFIG_AS_AVX) || !static_branch_likely(&poly1305_use_avx))
  31                 poly1305_emit_x86_64(ctx, mac, nonce);
  32 -       } else
  33 +       else
  34                 poly1305_emit_avx(ctx, mac, nonce);
  35  }
  36