ceph/src/isa-l/include/gf_vect_mul.h

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  30
  31 #ifndef _GF_VECT_MUL_H
  32 #define _GF_VECT_MUL_H
  33
  34 /**
  35  *  @file gf_vect_mul.h
  36  *  @brief Interface to functions for vector (block) multiplication in GF(2^8).
  37  *
  38  *  This file defines the interface to routines used in fast RAID rebuild and
  39  *  erasure codes.
  40  */
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45
  46  /**
  47  * @brief GF(2^8) vector multiply by constant.
  48  *
  49  * Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C
  50  * is a single field element in GF(2^8). Can be used for RAID6 rebuild
  51  * and partial write functions. Function requires pre-calculation of a
  52  * 32-element constant array based on constant C. gftbl(C) = {C{00},
  53  * C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len
  54  * and src must be aligned to 32B.
  55  * @requires SSE4.1
  56  *
  57  * @param len   Length of vector in bytes. Must be aligned to 32B.
  58  * @param gftbl Pointer to 32-byte array of pre-calculated constants based on C.
  59  * @param src   Pointer to src data array. Must be aligned to 32B.
  60  * @param dest  Pointer to destination data array. Must be aligned to 32B.
  61  * @returns 0 pass, other fail
  62  */
  63
  64 int gf_vect_mul_sse(int len, unsigned char *gftbl, void *src, void *dest);
  65
  66
  67  /**
  68  * @brief GF(2^8) vector multiply by constant.
  69  *
  70  * Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C
  71  * is a single field element in GF(2^8). Can be used for RAID6 rebuild
  72  * and partial write functions. Function requires pre-calculation of a
  73  * 32-element constant array based on constant C. gftbl(C) = {C{00},
  74  * C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len
  75  * and src must be aligned to 32B.
  76  * @requires AVX
  77  *
  78  * @param len   Length of vector in bytes. Must be aligned to 32B.
  79  * @param gftbl Pointer to 32-byte array of pre-calculated constants based on C.
  80  * @param src   Pointer to src data array. Must be aligned to 32B.
  81  * @param dest  Pointer to destination data array. Must be aligned to 32B.
  82  * @returns 0 pass, other fail
  83  */
  84
  85 int gf_vect_mul_avx(int len, unsigned char *gftbl, void *src, void *dest);
  86
  87
  88 /**
  89  * @brief GF(2^8) vector multiply by constant, runs appropriate version.
  90  *
  91  * Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C
  92  * is a single field element in GF(2^8). Can be used for RAID6 rebuild
  93  * and partial write functions. Function requires pre-calculation of a
  94  * 32-element constant array based on constant C. gftbl(C) = {C{00},
  95  * C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }.
  96  * Len and src must be aligned to 32B.
  97  *
  98  * This function determines what instruction sets are enabled
  99  * and selects the appropriate version at runtime.
 100  *
 101  * @param len   Length of vector in bytes. Must be aligned to 32B.
 102  * @param gftbl Pointer to 32-byte array of pre-calculated constants based on C.
 103  * @param src   Pointer to src data array. Must be aligned to 32B.
 104  * @param dest  Pointer to destination data array. Must be aligned to 32B.
 105  * @returns 0 pass, other fail
 106  */
 107
 108 int gf_vect_mul(int len, unsigned char *gftbl, void *src, void *dest);
 109
 110
 111 /**
 112  * @brief Initialize 32-byte constant array for GF(2^8) vector multiply
 113  *
 114  * Calculates array {C{00}, C{01}, C{02}, ... , C{0f} }, {C{00}, C{10},
 115  * C{20}, ... , C{f0} } as required by other fast vector multiply
 116  * functions.
 117  * @param c     Constant input.
 118  * @param gftbl Table output.
 119  */
 120
 121 void gf_vect_mul_init(unsigned char c, unsigned char* gftbl);
 122
 123
 124 /**
 125  * @brief GF(2^8) vector multiply by constant, runs baseline version.
 126  *
 127  * Does a GF(2^8) vector multiply b = Ca where a and b are arrays and C
 128  * is a single field element in GF(2^8). Can be used for RAID6 rebuild
 129  * and partial write functions. Function requires pre-calculation of a
 130  * 32-element constant array based on constant C. gftbl(C) = {C{00},
 131  * C{01}, C{02}, ... , C{0f} }, {C{00}, C{10}, C{20}, ... , C{f0} }. Len
 132  * and src must be aligned to 32B.
 133  *
 134  * @param len   Length of vector in bytes. Must be aligned to 32B.
 135  * @param a     Pointer to 32-byte array of pre-calculated constants based on C.
 136  *              only use 2nd element is used.
 137  * @param src   Pointer to src data array. Must be aligned to 32B.
 138  * @param dest  Pointer to destination data array. Must be aligned to 32B.
 139  */
 140
 141 void gf_vect_mul_base(int len, unsigned char *a, unsigned char *src,
 142                         unsigned char *dest);
 143
 144 #ifdef __cplusplus
 145 }
 146 #endif
 147
 148 #endif //_GF_VECT_MUL_H