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Diffstat (limited to 'src/isa-l/include/gf_vect_mul.h')
| -rw-r--r-- | src/isa-l/include/gf_vect_mul.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/isa-l/include/gf_vect_mul.h b/src/isa-l/include/gf_vect_mul.h new file mode 100644 index 000000000..70a0ab2ed --- /dev/null +++ b/src/isa-l/include/gf_vect_mul.h @@ -0,0 +1,152 @@ +/********************************************************************** + Copyright(c) 2011-2015 Intel Corporation All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of Intel Corporation nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +**********************************************************************/ + + +#ifndef _GF_VECT_MUL_H +#define _GF_VECT_MUL_H + +/** + * @file gf_vect_mul.h + * @brief Interface to functions for vector (block) multiplication in GF(2^8). + * + * This file defines the interface to routines used in fast RAID rebuild and + * erasure codes. + */ + +#ifdef __cplusplus +extern "C" { +#endif + +// x86 only +#if defined(__i386__) || defined(__x86_64__) + + /** + * @brief GF(2^8) vector multiply by constant. + * + * Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C + * is a single field element in GF(2^8). Can be used for RAID6 rebuild + * and partial write functions. Function requires pre-calculation of a + * 32-element constant array based on constant C. gftbl(C) = {C{00}, + * C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len + * and src must be aligned to 32B. + * @requires SSE4.1 + * + * @param len Length of vector in bytes. Must be aligned to 32B. + * @param gftbl Pointer to 32-byte array of pre-calculated constants based on C. + * @param src Pointer to src data array. Must be aligned to 32B. + * @param dest Pointer to destination data array. Must be aligned to 32B. + * @returns 0 pass, other fail + */ + +int gf_vect_mul_sse(int len, unsigned char *gftbl, void *src, void *dest); + + + /** + * @brief GF(2^8) vector multiply by constant. + * + * Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C + * is a single field element in GF(2^8). Can be used for RAID6 rebuild + * and partial write functions. Function requires pre-calculation of a + * 32-element constant array based on constant C. gftbl(C) = {C{00}, + * C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len + * and src must be aligned to 32B. + * @requires AVX + * + * @param len Length of vector in bytes. Must be aligned to 32B. + * @param gftbl Pointer to 32-byte array of pre-calculated constants based on C. + * @param src Pointer to src data array. Must be aligned to 32B. + * @param dest Pointer to destination data array. Must be aligned to 32B. + * @returns 0 pass, other fail + */ + +int gf_vect_mul_avx(int len, unsigned char *gftbl, void *src, void *dest); + +#endif + +/** + * @brief GF(2^8) vector multiply by constant, runs appropriate version. + * + * Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C + * is a single field element in GF(2^8). Can be used for RAID6 rebuild + * and partial write functions. Function requires pre-calculation of a + * 32-element constant array based on constant C. gftbl(C) = {C{00}, + * C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. + * Len and src must be aligned to 32B. + * + * This function determines what instruction sets are enabled + * and selects the appropriate version at runtime. + * + * @param len Length of vector in bytes. Must be aligned to 32B. + * @param gftbl Pointer to 32-byte array of pre-calculated constants based on C. + * @param src Pointer to src data array. Must be aligned to 32B. + * @param dest Pointer to destination data array. Must be aligned to 32B. + * @returns 0 pass, other fail + */ + +int gf_vect_mul(int len, unsigned char *gftbl, void *src, void *dest); + + +/** + * @brief Initialize 32-byte constant array for GF(2^8) vector multiply + * + * Calculates array {C{00}, C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, + * C{20}, ... , C{f0} } as required by other fast vector multiply + * functions. + * @param c Constant input. + * @param gftbl Table output. + */ + +void gf_vect_mul_init(unsigned char c, unsigned char* gftbl); + + +/** + * @brief GF(2^8) vector multiply by constant, runs baseline version. + * + * Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C + * is a single field element in GF(2^8). Can be used for RAID6 rebuild + * and partial write functions. Function requires pre-calculation of a + * 32-element constant array based on constant C. gftbl(C) = {C{00}, + * C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len + * and src must be aligned to 32B. + * + * @param len Length of vector in bytes. Must be aligned to 32B. + * @param a Pointer to 32-byte array of pre-calculated constants based on C. + * only use 2nd element is used. + * @param src Pointer to src data array. Must be aligned to 32B. + * @param dest Pointer to destination data array. Must be aligned to 32B. + */ + +void gf_vect_mul_base(int len, unsigned char *a, unsigned char *src, + unsigned char *dest); + +#ifdef __cplusplus +} +#endif + +#endif //_GF_VECT_MUL_H |