lib/raid6/test/test.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* -*- linux-c -*- ------------------------------------------------------- *
   3  *
   4  *   Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
   5  *
   6  * ----------------------------------------------------------------------- */
   7
   8 /*
   9  * raid6test.c
  10  *
  11  * Test RAID-6 recovery with various algorithms
  12  */
  13
  14 #include <stdlib.h>
  15 #include <stdio.h>
  16 #include <string.h>
  17 #include <linux/raid/pq.h>
  18
  19 #define NDISKS          16      /* Including P and Q */
  20
  21 const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
  22
  23 char *dataptrs[NDISKS];
  24 char data[NDISKS][PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
  25 char recovi[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
  26 char recovj[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
  27
  28 static void makedata(int start, int stop)
  29 {
  30         int i, j;
  31
  32         for (i = start; i <= stop; i++) {
  33                 for (j = 0; j < PAGE_SIZE; j++)
  34                         data[i][j] = rand();
  35
  36                 dataptrs[i] = data[i];
  37         }
  38 }
  39
  40 static char disk_type(int d)
  41 {
  42         switch (d) {
  43         case NDISKS-2:
  44                 return 'P';
  45         case NDISKS-1:
  46                 return 'Q';
  47         default:
  48                 return 'D';
  49         }
  50 }
  51
  52 static int test_disks(int i, int j)
  53 {
  54         int erra, errb;
  55
  56         memset(recovi, 0xf0, PAGE_SIZE);
  57         memset(recovj, 0xba, PAGE_SIZE);
  58
  59         dataptrs[i] = recovi;
  60         dataptrs[j] = recovj;
  61
  62         raid6_dual_recov(NDISKS, PAGE_SIZE, i, j, (void **)&dataptrs);
  63
  64         erra = memcmp(data[i], recovi, PAGE_SIZE);
  65         errb = memcmp(data[j], recovj, PAGE_SIZE);
  66
  67         if (i < NDISKS-2 && j == NDISKS-1) {
  68                 /* We don't implement the DQ failure scenario, since it's
  69                    equivalent to a RAID-5 failure (XOR, then recompute Q) */
  70                 erra = errb = 0;
  71         } else {
  72                 printf("algo=%-8s  faila=%3d(%c)  failb=%3d(%c)  %s\n",
  73                        raid6_call.name,
  74                        i, disk_type(i),
  75                        j, disk_type(j),
  76                        (!erra && !errb) ? "OK" :
  77                        !erra ? "ERRB" :
  78                        !errb ? "ERRA" : "ERRAB");
  79         }
  80
  81         dataptrs[i] = data[i];
  82         dataptrs[j] = data[j];
  83
  84         return erra || errb;
  85 }
  86
  87 int main(int argc, char *argv[])
  88 {
  89         const struct raid6_calls *const *algo;
  90         const struct raid6_recov_calls *const *ra;
  91         int i, j, p1, p2;
  92         int err = 0;
  93
  94         makedata(0, NDISKS-1);
  95
  96         for (ra = raid6_recov_algos; *ra; ra++) {
  97                 if ((*ra)->valid  && !(*ra)->valid())
  98                         continue;
  99
 100                 raid6_2data_recov = (*ra)->data2;
 101                 raid6_datap_recov = (*ra)->datap;
 102
 103                 printf("using recovery %s\n", (*ra)->name);
 104
 105                 for (algo = raid6_algos; *algo; algo++) {
 106                         if ((*algo)->valid && !(*algo)->valid())
 107                                 continue;
 108
 109                         raid6_call = **algo;
 110
 111                         /* Nuke syndromes */
 112                         memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
 113
 114                         /* Generate assumed good syndrome */
 115                         raid6_call.gen_syndrome(NDISKS, PAGE_SIZE,
 116                                                 (void **)&dataptrs);
 117
 118                         for (i = 0; i < NDISKS-1; i++)
 119                                 for (j = i+1; j < NDISKS; j++)
 120                                         err += test_disks(i, j);
 121
 122                         if (!raid6_call.xor_syndrome)
 123                                 continue;
 124
 125                         for (p1 = 0; p1 < NDISKS-2; p1++)
 126                                 for (p2 = p1; p2 < NDISKS-2; p2++) {
 127
 128                                         /* Simulate rmw run */
 129                                         raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
 130                                                                 (void **)&dataptrs);
 131                                         makedata(p1, p2);
 132                                         raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
 133                                                                 (void **)&dataptrs);
 134
 135                                         for (i = 0; i < NDISKS-1; i++)
 136                                                 for (j = i+1; j < NDISKS; j++)
 137                                                         err += test_disks(i, j);
 138                                 }
 139
 140                 }
 141                 printf("\n");
 142         }
 143
 144         printf("\n");
 145         /* Pick the best algorithm test */
 146         raid6_select_algo();
 147
 148         if (err)
 149                 printf("\n*** ERRORS FOUND ***\n");
 150
 151         return err;
 152 }