arch/powerpc/crypto/crc-vpmsum_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * CRC vpmsum tester
   4  * Copyright 2017 Daniel Axtens, IBM Corporation.
   5  */
   6
   7 #include <linux/crc-t10dif.h>
   8 #include <linux/crc32.h>
   9 #include <crypto/internal/hash.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/random.h>
  13 #include <linux/string.h>
  14 #include <linux/kernel.h>
  15 #include <linux/cpufeature.h>
  16 #include <asm/switch_to.h>
  17
  18 static unsigned long iterations = 10000;
  19
  20 #define MAX_CRC_LENGTH 65535
  21
  22
  23 static int __init crc_test_init(void)
  24 {
  25         u16 crc16 = 0, verify16 = 0;
  26         __le32 verify32le = 0;
  27         unsigned char *data;
  28         u32 verify32 = 0;
  29         unsigned long i;
  30         __le32 crc32;
  31         int ret;
  32
  33         struct crypto_shash *crct10dif_tfm;
  34         struct crypto_shash *crc32c_tfm;
  35
  36         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
  37                 return -ENODEV;
  38
  39         data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL);
  40         if (!data)
  41                 return -ENOMEM;
  42
  43         crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
  44
  45         if (IS_ERR(crct10dif_tfm)) {
  46                 pr_err("Error allocating crc-t10dif\n");
  47                 goto free_buf;
  48         }
  49
  50         crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0);
  51
  52         if (IS_ERR(crc32c_tfm)) {
  53                 pr_err("Error allocating crc32c\n");
  54                 goto free_16;
  55         }
  56
  57         do {
  58                 SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm);
  59                 SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm);
  60
  61                 crct10dif_shash->tfm = crct10dif_tfm;
  62                 ret = crypto_shash_init(crct10dif_shash);
  63
  64                 if (ret) {
  65                         pr_err("Error initing crc-t10dif\n");
  66                         goto free_32;
  67                 }
  68
  69
  70                 crc32c_shash->tfm = crc32c_tfm;
  71                 ret = crypto_shash_init(crc32c_shash);
  72
  73                 if (ret) {
  74                         pr_err("Error initing crc32c\n");
  75                         goto free_32;
  76                 }
  77
  78                 pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations);
  79                 for (i=0; i<iterations; i++) {
  80                         size_t offset = get_random_u32_below(16);
  81                         size_t len = get_random_u32_below(MAX_CRC_LENGTH);
  82
  83                         if (len <= offset)
  84                                 continue;
  85                         get_random_bytes(data, len);
  86                         len -= offset;
  87
  88                         crypto_shash_update(crct10dif_shash, data+offset, len);
  89                         crypto_shash_final(crct10dif_shash, (u8 *)(&crc16));
  90                         verify16 = crc_t10dif_generic(verify16, data+offset, len);
  91
  92
  93                         if (crc16 != verify16) {
  94                                 pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n",
  95                                        crc16, verify16, len);
  96                                 break;
  97                         }
  98
  99                         crypto_shash_update(crc32c_shash, data+offset, len);
 100                         crypto_shash_final(crc32c_shash, (u8 *)(&crc32));
 101                         verify32 = le32_to_cpu(verify32le);
 102                         verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len));
 103                         if (crc32 != verify32le) {
 104                                 pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n",
 105                                        crc32, verify32, len);
 106                                 break;
 107                         }
 108                 cond_resched();
 109                 }
 110                 pr_info("crc-vpmsum_test done, completed %lu iterations\n", i);
 111         } while (0);
 112
 113 free_32:
 114         crypto_free_shash(crc32c_tfm);
 115
 116 free_16:
 117         crypto_free_shash(crct10dif_tfm);
 118
 119 free_buf:
 120         kfree(data);
 121
 122         return 0;
 123 }
 124
 125 static void __exit crc_test_exit(void) {}
 126
 127 module_init(crc_test_init);
 128 module_exit(crc_test_exit);
 129 module_param(iterations, long, 0400);
 130
 131 MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
 132 MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester");
 133 MODULE_LICENSE("GPL");