arch/powerpc/crypto/crc-vpmsum_test.c

   1 /*
   2  * CRC vpmsum tester
   3  * Copyright 2017 Daniel Axtens, IBM Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/crc-t10dif.h>
  11 #include <linux/crc32.h>
  12 #include <crypto/internal/hash.h>
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/string.h>
  16 #include <linux/kernel.h>
  17 #include <linux/cpufeature.h>
  18 #include <asm/switch_to.h>
  19
  20 static unsigned long iterations = 10000;
  21
  22 #define MAX_CRC_LENGTH 65535
  23
  24
  25 static int __init crc_test_init(void)
  26 {
  27         u16 crc16 = 0, verify16 = 0;
  28         u32 crc32 = 0, verify32 = 0;
  29         __le32 verify32le = 0;
  30         unsigned char *data;
  31         unsigned long i;
  32         int ret;
  33
  34         struct crypto_shash *crct10dif_tfm;
  35         struct crypto_shash *crc32c_tfm;
  36
  37         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
  38                 return -ENODEV;
  39
  40         data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL);
  41         if (!data)
  42                 return -ENOMEM;
  43
  44         crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
  45
  46         if (IS_ERR(crct10dif_tfm)) {
  47                 pr_err("Error allocating crc-t10dif\n");
  48                 goto free_buf;
  49         }
  50
  51         crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0);
  52
  53         if (IS_ERR(crc32c_tfm)) {
  54                 pr_err("Error allocating crc32c\n");
  55                 goto free_16;
  56         }
  57
  58         do {
  59                 SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm);
  60                 SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm);
  61
  62                 crct10dif_shash->tfm = crct10dif_tfm;
  63                 ret = crypto_shash_init(crct10dif_shash);
  64
  65                 if (ret) {
  66                         pr_err("Error initing crc-t10dif\n");
  67                         goto free_32;
  68                 }
  69
  70
  71                 crc32c_shash->tfm = crc32c_tfm;
  72                 ret = crypto_shash_init(crc32c_shash);
  73
  74                 if (ret) {
  75                         pr_err("Error initing crc32c\n");
  76                         goto free_32;
  77                 }
  78
  79                 pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations);
  80                 for (i=0; i<iterations; i++) {
  81                         size_t len, offset;
  82
  83                         get_random_bytes(data, MAX_CRC_LENGTH);
  84                         get_random_bytes(&len, sizeof(len));
  85                         get_random_bytes(&offset, sizeof(offset));
  86
  87                         len %= MAX_CRC_LENGTH;
  88                         offset &= 15;
  89                         if (len <= offset)
  90                                 continue;
  91                         len -= offset;
  92
  93                         crypto_shash_update(crct10dif_shash, data+offset, len);
  94                         crypto_shash_final(crct10dif_shash, (u8 *)(&crc16));
  95                         verify16 = crc_t10dif_generic(verify16, data+offset, len);
  96
  97
  98                         if (crc16 != verify16) {
  99                                 pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n",
 100                                        crc16, verify16, len);
 101                                 break;
 102                         }
 103
 104                         crypto_shash_update(crc32c_shash, data+offset, len);
 105                         crypto_shash_final(crc32c_shash, (u8 *)(&crc32));
 106                         verify32 = le32_to_cpu(verify32le);
 107                         verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len));
 108                         if (crc32 != (u32)verify32le) {
 109                                 pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n",
 110                                        crc32, verify32, len);
 111                                 break;
 112                         }
 113                 }
 114                 pr_info("crc-vpmsum_test done, completed %lu iterations\n", i);
 115         } while (0);
 116
 117 free_32:
 118         crypto_free_shash(crc32c_tfm);
 119
 120 free_16:
 121         crypto_free_shash(crct10dif_tfm);
 122
 123 free_buf:
 124         kfree(data);
 125
 126         return 0;
 127 }
 128
 129 static void __exit crc_test_exit(void) {}
 130
 131 module_init(crc_test_init);
 132 module_exit(crc_test_exit);
 133 module_param(iterations, long, 0400);
 134
 135 MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
 136 MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester");
 137 MODULE_LICENSE("GPL");