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5d2405227a
Adds xxhash kernel module with xxh32 and xxh64 hashes. xxhash is an
extremely fast non-cryptographic hash algorithm for checksumming.
The zstd compression and decompression modules added in the next patch
require xxhash. I extracted it out from zstd since it is useful on its
own. I copied the code from the upstream XXHash source repository and
translated it into kernel style. I ran benchmarks and tests in the kernel
and tests in userland.
I benchmarked xxhash as a special character device. I ran in four modes,
no-op, xxh32, xxh64, and crc32. The no-op mode simply copies the data to
kernel space and ignores it. The xxh32, xxh64, and crc32 modes compute
hashes on the copied data. I also ran it with four different buffer sizes.
The benchmark file is located in the upstream zstd source repository under
`contrib/linux-kernel/xxhash_test.c` [1].
I ran the benchmarks on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM.
The VM is running on a MacBook Pro with a 3.1 GHz Intel Core i7 processor,
16 GB of RAM, and a SSD. I benchmarked using the file `filesystem.squashfs`
from `ubuntu-16.10-desktop-amd64.iso`, which is 1,536,217,088 B large.
Run the following commands for the benchmark:
modprobe xxhash_test
mknod xxhash_test c 245 0
time cp filesystem.squashfs xxhash_test
The time is reported by the time of the userland `cp`.
The GB/s is computed with
1,536,217,008 B / time(buffer size, hash)
which includes the time to copy from userland.
The Normalized GB/s is computed with
1,536,217,088 B / (time(buffer size, hash) - time(buffer size, none)).
| Buffer Size (B) | Hash | Time (s) | GB/s | Adjusted GB/s |
|-----------------|-------|----------|------|---------------|
| 1024 | none | 0.408 | 3.77 | - |
| 1024 | xxh32 | 0.649 | 2.37 | 6.37 |
| 1024 | xxh64 | 0.542 | 2.83 | 11.46 |
| 1024 | crc32 | 1.290 | 1.19 | 1.74 |
| 4096 | none | 0.380 | 4.04 | - |
| 4096 | xxh32 | 0.645 | 2.38 | 5.79 |
| 4096 | xxh64 | 0.500 | 3.07 | 12.80 |
| 4096 | crc32 | 1.168 | 1.32 | 1.95 |
| 8192 | none | 0.351 | 4.38 | - |
| 8192 | xxh32 | 0.614 | 2.50 | 5.84 |
| 8192 | xxh64 | 0.464 | 3.31 | 13.60 |
| 8192 | crc32 | 1.163 | 1.32 | 1.89 |
| 16384 | none | 0.346 | 4.43 | - |
| 16384 | xxh32 | 0.590 | 2.60 | 6.30 |
| 16384 | xxh64 | 0.466 | 3.30 | 12.80 |
| 16384 | crc32 | 1.183 | 1.30 | 1.84 |
Tested in userland using the test-suite in the zstd repo under
`contrib/linux-kernel/test/XXHashUserlandTest.cpp` [2] by mocking the
kernel functions. A line in each branch of every function in `xxhash.c`
was commented out to ensure that the test-suite fails. Additionally
tested while testing zstd and with SMHasher [3].
[1] https://phabricator.intern.facebook.com/P57526246
[2] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/test/XXHashUserlandTest.cpp
[3] https://github.com/aappleby/smhasher
zstd source repository: https://github.com/facebook/zstd
XXHash source repository: https://github.com/cyan4973/xxhash
Signed-off-by: Nick Terrell <terrelln@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
501 lines
13 KiB
C
501 lines
13 KiB
C
/*
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* xxHash - Extremely Fast Hash algorithm
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* Copyright (C) 2012-2016, Yann Collet.
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*
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* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation. This program is dual-licensed; you may select
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* either version 2 of the GNU General Public License ("GPL") or BSD license
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* ("BSD").
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*
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* You can contact the author at:
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* - xxHash homepage: http://cyan4973.github.io/xxHash/
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* - xxHash source repository: https://github.com/Cyan4973/xxHash
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*/
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#include <asm/unaligned.h>
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#include <linux/errno.h>
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#include <linux/compiler.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/xxhash.h>
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/*-*************************************
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* Macros
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**************************************/
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#define xxh_rotl32(x, r) ((x << r) | (x >> (32 - r)))
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#define xxh_rotl64(x, r) ((x << r) | (x >> (64 - r)))
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#ifdef __LITTLE_ENDIAN
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# define XXH_CPU_LITTLE_ENDIAN 1
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#else
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# define XXH_CPU_LITTLE_ENDIAN 0
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#endif
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/*-*************************************
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* Constants
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**************************************/
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static const uint32_t PRIME32_1 = 2654435761U;
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static const uint32_t PRIME32_2 = 2246822519U;
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static const uint32_t PRIME32_3 = 3266489917U;
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static const uint32_t PRIME32_4 = 668265263U;
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static const uint32_t PRIME32_5 = 374761393U;
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static const uint64_t PRIME64_1 = 11400714785074694791ULL;
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static const uint64_t PRIME64_2 = 14029467366897019727ULL;
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static const uint64_t PRIME64_3 = 1609587929392839161ULL;
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static const uint64_t PRIME64_4 = 9650029242287828579ULL;
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static const uint64_t PRIME64_5 = 2870177450012600261ULL;
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/*-**************************
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* Utils
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***************************/
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void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src)
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{
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memcpy(dst, src, sizeof(*dst));
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}
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EXPORT_SYMBOL(xxh32_copy_state);
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void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src)
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{
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memcpy(dst, src, sizeof(*dst));
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}
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EXPORT_SYMBOL(xxh64_copy_state);
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/*-***************************
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* Simple Hash Functions
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****************************/
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static uint32_t xxh32_round(uint32_t seed, const uint32_t input)
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{
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seed += input * PRIME32_2;
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seed = xxh_rotl32(seed, 13);
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seed *= PRIME32_1;
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return seed;
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}
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uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)
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{
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const uint8_t *p = (const uint8_t *)input;
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const uint8_t *b_end = p + len;
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uint32_t h32;
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if (len >= 16) {
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const uint8_t *const limit = b_end - 16;
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uint32_t v1 = seed + PRIME32_1 + PRIME32_2;
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uint32_t v2 = seed + PRIME32_2;
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uint32_t v3 = seed + 0;
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uint32_t v4 = seed - PRIME32_1;
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do {
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v1 = xxh32_round(v1, get_unaligned_le32(p));
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p += 4;
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v2 = xxh32_round(v2, get_unaligned_le32(p));
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p += 4;
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v3 = xxh32_round(v3, get_unaligned_le32(p));
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p += 4;
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v4 = xxh32_round(v4, get_unaligned_le32(p));
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p += 4;
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} while (p <= limit);
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h32 = xxh_rotl32(v1, 1) + xxh_rotl32(v2, 7) +
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xxh_rotl32(v3, 12) + xxh_rotl32(v4, 18);
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} else {
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h32 = seed + PRIME32_5;
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}
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h32 += (uint32_t)len;
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while (p + 4 <= b_end) {
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h32 += get_unaligned_le32(p) * PRIME32_3;
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h32 = xxh_rotl32(h32, 17) * PRIME32_4;
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p += 4;
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}
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while (p < b_end) {
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h32 += (*p) * PRIME32_5;
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h32 = xxh_rotl32(h32, 11) * PRIME32_1;
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p++;
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}
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h32 ^= h32 >> 15;
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h32 *= PRIME32_2;
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h32 ^= h32 >> 13;
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h32 *= PRIME32_3;
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h32 ^= h32 >> 16;
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return h32;
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}
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EXPORT_SYMBOL(xxh32);
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static uint64_t xxh64_round(uint64_t acc, const uint64_t input)
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{
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acc += input * PRIME64_2;
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acc = xxh_rotl64(acc, 31);
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acc *= PRIME64_1;
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return acc;
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}
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static uint64_t xxh64_merge_round(uint64_t acc, uint64_t val)
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{
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val = xxh64_round(0, val);
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acc ^= val;
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acc = acc * PRIME64_1 + PRIME64_4;
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return acc;
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}
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uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)
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{
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const uint8_t *p = (const uint8_t *)input;
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const uint8_t *const b_end = p + len;
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uint64_t h64;
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if (len >= 32) {
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const uint8_t *const limit = b_end - 32;
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uint64_t v1 = seed + PRIME64_1 + PRIME64_2;
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uint64_t v2 = seed + PRIME64_2;
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uint64_t v3 = seed + 0;
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uint64_t v4 = seed - PRIME64_1;
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do {
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v1 = xxh64_round(v1, get_unaligned_le64(p));
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p += 8;
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v2 = xxh64_round(v2, get_unaligned_le64(p));
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p += 8;
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v3 = xxh64_round(v3, get_unaligned_le64(p));
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p += 8;
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v4 = xxh64_round(v4, get_unaligned_le64(p));
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p += 8;
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} while (p <= limit);
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h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
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xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
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h64 = xxh64_merge_round(h64, v1);
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h64 = xxh64_merge_round(h64, v2);
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h64 = xxh64_merge_round(h64, v3);
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h64 = xxh64_merge_round(h64, v4);
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} else {
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h64 = seed + PRIME64_5;
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}
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h64 += (uint64_t)len;
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while (p + 8 <= b_end) {
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const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
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h64 ^= k1;
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h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
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p += 8;
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}
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if (p + 4 <= b_end) {
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h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
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h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
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p += 4;
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}
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while (p < b_end) {
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h64 ^= (*p) * PRIME64_5;
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h64 = xxh_rotl64(h64, 11) * PRIME64_1;
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p++;
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}
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h64 ^= h64 >> 33;
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h64 *= PRIME64_2;
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h64 ^= h64 >> 29;
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h64 *= PRIME64_3;
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h64 ^= h64 >> 32;
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return h64;
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}
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EXPORT_SYMBOL(xxh64);
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/*-**************************************************
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* Advanced Hash Functions
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***************************************************/
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void xxh32_reset(struct xxh32_state *statePtr, const uint32_t seed)
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{
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/* use a local state for memcpy() to avoid strict-aliasing warnings */
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struct xxh32_state state;
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memset(&state, 0, sizeof(state));
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state.v1 = seed + PRIME32_1 + PRIME32_2;
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state.v2 = seed + PRIME32_2;
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state.v3 = seed + 0;
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state.v4 = seed - PRIME32_1;
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memcpy(statePtr, &state, sizeof(state));
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}
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EXPORT_SYMBOL(xxh32_reset);
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void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed)
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{
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/* use a local state for memcpy() to avoid strict-aliasing warnings */
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struct xxh64_state state;
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memset(&state, 0, sizeof(state));
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state.v1 = seed + PRIME64_1 + PRIME64_2;
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state.v2 = seed + PRIME64_2;
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state.v3 = seed + 0;
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state.v4 = seed - PRIME64_1;
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memcpy(statePtr, &state, sizeof(state));
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}
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EXPORT_SYMBOL(xxh64_reset);
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int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
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{
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const uint8_t *p = (const uint8_t *)input;
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const uint8_t *const b_end = p + len;
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if (input == NULL)
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return -EINVAL;
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state->total_len_32 += (uint32_t)len;
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state->large_len |= (len >= 16) | (state->total_len_32 >= 16);
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if (state->memsize + len < 16) { /* fill in tmp buffer */
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memcpy((uint8_t *)(state->mem32) + state->memsize, input, len);
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state->memsize += (uint32_t)len;
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return 0;
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}
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if (state->memsize) { /* some data left from previous update */
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const uint32_t *p32 = state->mem32;
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memcpy((uint8_t *)(state->mem32) + state->memsize, input,
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16 - state->memsize);
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state->v1 = xxh32_round(state->v1, get_unaligned_le32(p32));
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p32++;
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state->v2 = xxh32_round(state->v2, get_unaligned_le32(p32));
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p32++;
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state->v3 = xxh32_round(state->v3, get_unaligned_le32(p32));
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p32++;
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state->v4 = xxh32_round(state->v4, get_unaligned_le32(p32));
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p32++;
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p += 16-state->memsize;
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state->memsize = 0;
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}
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if (p <= b_end - 16) {
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const uint8_t *const limit = b_end - 16;
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uint32_t v1 = state->v1;
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uint32_t v2 = state->v2;
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uint32_t v3 = state->v3;
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uint32_t v4 = state->v4;
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do {
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v1 = xxh32_round(v1, get_unaligned_le32(p));
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p += 4;
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v2 = xxh32_round(v2, get_unaligned_le32(p));
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p += 4;
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v3 = xxh32_round(v3, get_unaligned_le32(p));
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p += 4;
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v4 = xxh32_round(v4, get_unaligned_le32(p));
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p += 4;
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} while (p <= limit);
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state->v1 = v1;
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state->v2 = v2;
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state->v3 = v3;
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state->v4 = v4;
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}
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if (p < b_end) {
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memcpy(state->mem32, p, (size_t)(b_end-p));
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state->memsize = (uint32_t)(b_end-p);
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}
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return 0;
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}
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EXPORT_SYMBOL(xxh32_update);
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uint32_t xxh32_digest(const struct xxh32_state *state)
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{
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const uint8_t *p = (const uint8_t *)state->mem32;
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const uint8_t *const b_end = (const uint8_t *)(state->mem32) +
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state->memsize;
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uint32_t h32;
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if (state->large_len) {
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h32 = xxh_rotl32(state->v1, 1) + xxh_rotl32(state->v2, 7) +
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xxh_rotl32(state->v3, 12) + xxh_rotl32(state->v4, 18);
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} else {
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h32 = state->v3 /* == seed */ + PRIME32_5;
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}
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h32 += state->total_len_32;
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while (p + 4 <= b_end) {
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h32 += get_unaligned_le32(p) * PRIME32_3;
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h32 = xxh_rotl32(h32, 17) * PRIME32_4;
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p += 4;
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}
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while (p < b_end) {
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h32 += (*p) * PRIME32_5;
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h32 = xxh_rotl32(h32, 11) * PRIME32_1;
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p++;
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}
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h32 ^= h32 >> 15;
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h32 *= PRIME32_2;
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h32 ^= h32 >> 13;
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h32 *= PRIME32_3;
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h32 ^= h32 >> 16;
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return h32;
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}
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EXPORT_SYMBOL(xxh32_digest);
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int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
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{
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const uint8_t *p = (const uint8_t *)input;
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const uint8_t *const b_end = p + len;
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if (input == NULL)
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return -EINVAL;
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state->total_len += len;
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if (state->memsize + len < 32) { /* fill in tmp buffer */
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memcpy(((uint8_t *)state->mem64) + state->memsize, input, len);
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state->memsize += (uint32_t)len;
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return 0;
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}
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if (state->memsize) { /* tmp buffer is full */
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uint64_t *p64 = state->mem64;
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memcpy(((uint8_t *)p64) + state->memsize, input,
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32 - state->memsize);
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state->v1 = xxh64_round(state->v1, get_unaligned_le64(p64));
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p64++;
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state->v2 = xxh64_round(state->v2, get_unaligned_le64(p64));
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p64++;
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state->v3 = xxh64_round(state->v3, get_unaligned_le64(p64));
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p64++;
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state->v4 = xxh64_round(state->v4, get_unaligned_le64(p64));
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p += 32 - state->memsize;
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state->memsize = 0;
|
|
}
|
|
|
|
if (p + 32 <= b_end) {
|
|
const uint8_t *const limit = b_end - 32;
|
|
uint64_t v1 = state->v1;
|
|
uint64_t v2 = state->v2;
|
|
uint64_t v3 = state->v3;
|
|
uint64_t v4 = state->v4;
|
|
|
|
do {
|
|
v1 = xxh64_round(v1, get_unaligned_le64(p));
|
|
p += 8;
|
|
v2 = xxh64_round(v2, get_unaligned_le64(p));
|
|
p += 8;
|
|
v3 = xxh64_round(v3, get_unaligned_le64(p));
|
|
p += 8;
|
|
v4 = xxh64_round(v4, get_unaligned_le64(p));
|
|
p += 8;
|
|
} while (p <= limit);
|
|
|
|
state->v1 = v1;
|
|
state->v2 = v2;
|
|
state->v3 = v3;
|
|
state->v4 = v4;
|
|
}
|
|
|
|
if (p < b_end) {
|
|
memcpy(state->mem64, p, (size_t)(b_end-p));
|
|
state->memsize = (uint32_t)(b_end - p);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(xxh64_update);
|
|
|
|
uint64_t xxh64_digest(const struct xxh64_state *state)
|
|
{
|
|
const uint8_t *p = (const uint8_t *)state->mem64;
|
|
const uint8_t *const b_end = (const uint8_t *)state->mem64 +
|
|
state->memsize;
|
|
uint64_t h64;
|
|
|
|
if (state->total_len >= 32) {
|
|
const uint64_t v1 = state->v1;
|
|
const uint64_t v2 = state->v2;
|
|
const uint64_t v3 = state->v3;
|
|
const uint64_t v4 = state->v4;
|
|
|
|
h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
|
|
xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
|
|
h64 = xxh64_merge_round(h64, v1);
|
|
h64 = xxh64_merge_round(h64, v2);
|
|
h64 = xxh64_merge_round(h64, v3);
|
|
h64 = xxh64_merge_round(h64, v4);
|
|
} else {
|
|
h64 = state->v3 + PRIME64_5;
|
|
}
|
|
|
|
h64 += (uint64_t)state->total_len;
|
|
|
|
while (p + 8 <= b_end) {
|
|
const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
|
|
|
|
h64 ^= k1;
|
|
h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
|
|
p += 8;
|
|
}
|
|
|
|
if (p + 4 <= b_end) {
|
|
h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
|
|
h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
|
|
p += 4;
|
|
}
|
|
|
|
while (p < b_end) {
|
|
h64 ^= (*p) * PRIME64_5;
|
|
h64 = xxh_rotl64(h64, 11) * PRIME64_1;
|
|
p++;
|
|
}
|
|
|
|
h64 ^= h64 >> 33;
|
|
h64 *= PRIME64_2;
|
|
h64 ^= h64 >> 29;
|
|
h64 *= PRIME64_3;
|
|
h64 ^= h64 >> 32;
|
|
|
|
return h64;
|
|
}
|
|
EXPORT_SYMBOL(xxh64_digest);
|
|
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_DESCRIPTION("xxHash");
|