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Diffstat (limited to 'target/linux/generic/backport-5.4/080-wireguard-0057-crypto-arch-lib-limit-simd-usage-to-4k-chunks.patch')
-rw-r--r--target/linux/generic/backport-5.4/080-wireguard-0057-crypto-arch-lib-limit-simd-usage-to-4k-chunks.patch243
1 files changed, 243 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/080-wireguard-0057-crypto-arch-lib-limit-simd-usage-to-4k-chunks.patch b/target/linux/generic/backport-5.4/080-wireguard-0057-crypto-arch-lib-limit-simd-usage-to-4k-chunks.patch
new file mode 100644
index 0000000000..bb0f5802a9
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0057-crypto-arch-lib-limit-simd-usage-to-4k-chunks.patch
@@ -0,0 +1,243 @@
+From af386d2b1f9207290a12aa97ecec8b428f3bebb2 Mon Sep 17 00:00:00 2001
+From: "Jason A. Donenfeld" <Jason@zx2c4.com>
+Date: Thu, 23 Apr 2020 15:54:04 -0600
+Subject: [PATCH 057/124] crypto: arch/lib - limit simd usage to 4k chunks
+
+commit 706024a52c614b478b63f7728d202532ce6591a9 upstream.
+
+The initial Zinc patchset, after some mailing list discussion, contained
+code to ensure that kernel_fpu_enable would not be kept on for more than
+a 4k chunk, since it disables preemption. The choice of 4k isn't totally
+scientific, but it's not a bad guess either, and it's what's used in
+both the x86 poly1305, blake2s, and nhpoly1305 code already (in the form
+of PAGE_SIZE, which this commit corrects to be explicitly 4k for the
+former two).
+
+Ard did some back of the envelope calculations and found that
+at 5 cycles/byte (overestimate) on a 1ghz processor (pretty slow), 4k
+means we have a maximum preemption disabling of 20us, which Sebastian
+confirmed was probably a good limit.
+
+Unfortunately the chunking appears to have been left out of the final
+patchset that added the glue code. So, this commit adds it back in.
+
+Fixes: 84e03fa39fbe ("crypto: x86/chacha - expose SIMD ChaCha routine as library function")
+Fixes: b3aad5bad26a ("crypto: arm64/chacha - expose arm64 ChaCha routine as library function")
+Fixes: a44a3430d71b ("crypto: arm/chacha - expose ARM ChaCha routine as library function")
+Fixes: d7d7b8535662 ("crypto: x86/poly1305 - wire up faster implementations for kernel")
+Fixes: f569ca164751 ("crypto: arm64/poly1305 - incorporate OpenSSL/CRYPTOGAMS NEON implementation")
+Fixes: a6b803b3ddc7 ("crypto: arm/poly1305 - incorporate OpenSSL/CRYPTOGAMS NEON implementation")
+Fixes: ed0356eda153 ("crypto: blake2s - x86_64 SIMD implementation")
+Cc: Eric Biggers <ebiggers@google.com>
+Cc: Ard Biesheuvel <ardb@kernel.org>
+Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Cc: stable@vger.kernel.org
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
+Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+---
+ arch/arm/crypto/chacha-glue.c | 14 +++++++++++---
+ arch/arm/crypto/poly1305-glue.c | 15 +++++++++++----
+ arch/arm64/crypto/chacha-neon-glue.c | 14 +++++++++++---
+ arch/arm64/crypto/poly1305-glue.c | 15 +++++++++++----
+ arch/x86/crypto/blake2s-glue.c | 10 ++++------
+ arch/x86/crypto/chacha_glue.c | 14 +++++++++++---
+ arch/x86/crypto/poly1305_glue.c | 13 ++++++-------
+ 7 files changed, 65 insertions(+), 30 deletions(-)
+
+--- a/arch/arm/crypto/chacha-glue.c
++++ b/arch/arm/crypto/chacha-glue.c
+@@ -91,9 +91,17 @@ void chacha_crypt_arch(u32 *state, u8 *d
+ return;
+ }
+
+- kernel_neon_begin();
+- chacha_doneon(state, dst, src, bytes, nrounds);
+- kernel_neon_end();
++ do {
++ unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
++
++ kernel_neon_begin();
++ chacha_doneon(state, dst, src, todo, nrounds);
++ kernel_neon_end();
++
++ bytes -= todo;
++ src += todo;
++ dst += todo;
++ } while (bytes);
+ }
+ EXPORT_SYMBOL(chacha_crypt_arch);
+
+--- a/arch/arm/crypto/poly1305-glue.c
++++ b/arch/arm/crypto/poly1305-glue.c
+@@ -160,13 +160,20 @@ void poly1305_update_arch(struct poly130
+ unsigned int len = round_down(nbytes, POLY1305_BLOCK_SIZE);
+
+ if (static_branch_likely(&have_neon) && do_neon) {
+- kernel_neon_begin();
+- poly1305_blocks_neon(&dctx->h, src, len, 1);
+- kernel_neon_end();
++ do {
++ unsigned int todo = min_t(unsigned int, len, SZ_4K);
++
++ kernel_neon_begin();
++ poly1305_blocks_neon(&dctx->h, src, todo, 1);
++ kernel_neon_end();
++
++ len -= todo;
++ src += todo;
++ } while (len);
+ } else {
+ poly1305_blocks_arm(&dctx->h, src, len, 1);
++ src += len;
+ }
+- src += len;
+ nbytes %= POLY1305_BLOCK_SIZE;
+ }
+
+--- a/arch/arm64/crypto/chacha-neon-glue.c
++++ b/arch/arm64/crypto/chacha-neon-glue.c
+@@ -87,9 +87,17 @@ void chacha_crypt_arch(u32 *state, u8 *d
+ !crypto_simd_usable())
+ return chacha_crypt_generic(state, dst, src, bytes, nrounds);
+
+- kernel_neon_begin();
+- chacha_doneon(state, dst, src, bytes, nrounds);
+- kernel_neon_end();
++ do {
++ unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
++
++ kernel_neon_begin();
++ chacha_doneon(state, dst, src, todo, nrounds);
++ kernel_neon_end();
++
++ bytes -= todo;
++ src += todo;
++ dst += todo;
++ } while (bytes);
+ }
+ EXPORT_SYMBOL(chacha_crypt_arch);
+
+--- a/arch/arm64/crypto/poly1305-glue.c
++++ b/arch/arm64/crypto/poly1305-glue.c
+@@ -143,13 +143,20 @@ void poly1305_update_arch(struct poly130
+ unsigned int len = round_down(nbytes, POLY1305_BLOCK_SIZE);
+
+ if (static_branch_likely(&have_neon) && crypto_simd_usable()) {
+- kernel_neon_begin();
+- poly1305_blocks_neon(&dctx->h, src, len, 1);
+- kernel_neon_end();
++ do {
++ unsigned int todo = min_t(unsigned int, len, SZ_4K);
++
++ kernel_neon_begin();
++ poly1305_blocks_neon(&dctx->h, src, todo, 1);
++ kernel_neon_end();
++
++ len -= todo;
++ src += todo;
++ } while (len);
+ } else {
+ poly1305_blocks(&dctx->h, src, len, 1);
++ src += len;
+ }
+- src += len;
+ nbytes %= POLY1305_BLOCK_SIZE;
+ }
+
+--- a/arch/x86/crypto/blake2s-glue.c
++++ b/arch/x86/crypto/blake2s-glue.c
+@@ -32,16 +32,16 @@ void blake2s_compress_arch(struct blake2
+ const u32 inc)
+ {
+ /* SIMD disables preemption, so relax after processing each page. */
+- BUILD_BUG_ON(PAGE_SIZE / BLAKE2S_BLOCK_SIZE < 8);
++ BUILD_BUG_ON(SZ_4K / BLAKE2S_BLOCK_SIZE < 8);
+
+ if (!static_branch_likely(&blake2s_use_ssse3) || !crypto_simd_usable()) {
+ blake2s_compress_generic(state, block, nblocks, inc);
+ return;
+ }
+
+- for (;;) {
++ do {
+ const size_t blocks = min_t(size_t, nblocks,
+- PAGE_SIZE / BLAKE2S_BLOCK_SIZE);
++ SZ_4K / BLAKE2S_BLOCK_SIZE);
+
+ kernel_fpu_begin();
+ if (IS_ENABLED(CONFIG_AS_AVX512) &&
+@@ -52,10 +52,8 @@ void blake2s_compress_arch(struct blake2
+ kernel_fpu_end();
+
+ nblocks -= blocks;
+- if (!nblocks)
+- break;
+ block += blocks * BLAKE2S_BLOCK_SIZE;
+- }
++ } while (nblocks);
+ }
+ EXPORT_SYMBOL(blake2s_compress_arch);
+
+--- a/arch/x86/crypto/chacha_glue.c
++++ b/arch/x86/crypto/chacha_glue.c
+@@ -154,9 +154,17 @@ void chacha_crypt_arch(u32 *state, u8 *d
+ bytes <= CHACHA_BLOCK_SIZE)
+ return chacha_crypt_generic(state, dst, src, bytes, nrounds);
+
+- kernel_fpu_begin();
+- chacha_dosimd(state, dst, src, bytes, nrounds);
+- kernel_fpu_end();
++ do {
++ unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
++
++ kernel_fpu_begin();
++ chacha_dosimd(state, dst, src, todo, nrounds);
++ kernel_fpu_end();
++
++ bytes -= todo;
++ src += todo;
++ dst += todo;
++ } while (bytes);
+ }
+ EXPORT_SYMBOL(chacha_crypt_arch);
+
+--- a/arch/x86/crypto/poly1305_glue.c
++++ b/arch/x86/crypto/poly1305_glue.c
+@@ -91,8 +91,8 @@ static void poly1305_simd_blocks(void *c
+ struct poly1305_arch_internal *state = ctx;
+
+ /* SIMD disables preemption, so relax after processing each page. */
+- BUILD_BUG_ON(PAGE_SIZE < POLY1305_BLOCK_SIZE ||
+- PAGE_SIZE % POLY1305_BLOCK_SIZE);
++ BUILD_BUG_ON(SZ_4K < POLY1305_BLOCK_SIZE ||
++ SZ_4K % POLY1305_BLOCK_SIZE);
+
+ if (!IS_ENABLED(CONFIG_AS_AVX) || !static_branch_likely(&poly1305_use_avx) ||
+ (len < (POLY1305_BLOCK_SIZE * 18) && !state->is_base2_26) ||
+@@ -102,8 +102,8 @@ static void poly1305_simd_blocks(void *c
+ return;
+ }
+
+- for (;;) {
+- const size_t bytes = min_t(size_t, len, PAGE_SIZE);
++ do {
++ const size_t bytes = min_t(size_t, len, SZ_4K);
+
+ kernel_fpu_begin();
+ if (IS_ENABLED(CONFIG_AS_AVX512) && static_branch_likely(&poly1305_use_avx512))
+@@ -113,11 +113,10 @@ static void poly1305_simd_blocks(void *c
+ else
+ poly1305_blocks_avx(ctx, inp, bytes, padbit);
+ kernel_fpu_end();
++
+ len -= bytes;
+- if (!len)
+- break;
+ inp += bytes;
+- }
++ } while (len);
+ }
+
+ static void poly1305_simd_emit(void *ctx, u8 mac[POLY1305_DIGEST_SIZE],
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-16 13:45:34 +0000