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149 lines
5.9 KiB
C
149 lines
5.9 KiB
C
/**********************************************************************
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Copyright(c) 2011-2014 Intel Corporation All rights reserved.
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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
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are met:
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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 copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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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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#ifndef _GF_VECT_MUL_H
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#define _GF_VECT_MUL_H
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/**
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* @file gf-vect-mul.h
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* @brief Interface to functions for vector (block) multiplication in GF(2^8).
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*
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* This file defines the interface to routines used in fast RAID rebuild and
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* erasure codes.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief GF(2^8) vector multiply by constant.
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*
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* Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C
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* is a single field element in GF(2^8). Can be used for RAID6 rebuild
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* and partial write functions. Function requires pre-calculation of a
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* 32-element constant array based on constant C. gftbl(C) = {C{00},
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* C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len
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* and src must be aligned to 32B.
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* @requires SSE4.1
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* @param len Length of vector in bytes. Must be aligned to 32B.
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* @param gftbl Pointer to 32-byte array of pre-calculated constants based on C.
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* @param src Pointer to src data array. Must be aligned to 32B.
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* @param dest Pointer to destination data array. Must be aligned to 32B.
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* @returns 0 pass, other fail
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*/
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int gf_vect_mul_sse(int len, unsigned char *gftbl, void *src, void *dest);
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/**
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* @brief GF(2^8) vector multiply by constant.
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*
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* Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C
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* is a single field element in GF(2^8). Can be used for RAID6 rebuild
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* and partial write functions. Function requires pre-calculation of a
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* 32-element constant array based on constant C. gftbl(C) = {C{00},
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* C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len
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* and src must be aligned to 32B.
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* @requires AVX
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* @param len Length of vector in bytes. Must be aligned to 32B.
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* @param gftbl Pointer to 32-byte array of pre-calculated constants based on C.
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* @param src Pointer to src data array. Must be aligned to 32B.
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* @param dest Pointer to destination data array. Must be aligned to 32B.
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* @returns 0 pass, other fail
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*/
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int gf_vect_mul_avx(int len, unsigned char *gftbl, void *src, void *dest);
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/**
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* @brief GF(2^8) vector multiply by constant, runs appropriate version.
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*
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* Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C
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* is a single field element in GF(2^8). Can be used for RAID6 rebuild
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* and partial write functions. Function requires pre-calculation of a
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* 32-element constant array based on constant C. gftbl(C) = {C{00},
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* C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }.
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* Len and src must be aligned to 32B.
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*
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* This function determines what instruction sets are enabled
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* and selects the appropriate version at runtime.
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*
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* @param len Length of vector in bytes. Must be aligned to 32B.
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* @param gftbl Pointer to 32-byte array of pre-calculated constants based on C.
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* @param src Pointer to src data array. Must be aligned to 32B.
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* @param dest Pointer to destination data array. Must be aligned to 32B.
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* @returns 0 pass, other fail
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*/
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int gf_vect_mul(int len, unsigned char *gftbl, void *src, void *dest);
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/**
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* @brief Initialize 32-byte constant array for GF(2^8) vector multiply
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*
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* Calculates array {C{00}, C{01}, C{02}, ... , C{0f} }, {C{00}, C{10},
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* C{20}, ... , C{f0} } as required by other fast vector multiply
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* functions.
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* @param c Constant input.
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* @param gftbl Table output.
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*/
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void gf_vect_mul_init(unsigned char c, unsigned char* gftbl);
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/**
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* @brief GF(2^8) vector multiply by constant, runs baseline version.
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*
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* Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C
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* is a single field element in GF(2^8). Can be used for RAID6 rebuild
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* and partial write functions. Function requires pre-calculation of a
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* 32-element constant array based on constant C. gftbl(C) = {C{00},
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* C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len
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* and src must be aligned to 32B.
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*
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* @param len Length of vector in bytes. Must be aligned to 32B.
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* @param a Pointer to 32-byte array of pre-calculated constants based on C.
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* only use 2nd element is used.
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* @param src Pointer to src data array. Must be aligned to 32B.
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* @param dest Pointer to destination data array. Must be aligned to 32B.
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*/
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void gf_vect_mul_base(int len, unsigned char *a, unsigned char *src,
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unsigned char *dest);
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#ifdef __cplusplus
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}
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#endif
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#endif //_GF_VECT_MUL_H
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