minio/pkg/erasure/gf_vect_mul.h

149 lines
5.9 KiB
C

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#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
/**
* @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);
/**
* @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