root/arch/powerpc/crypto/crc-vpmsum_test.c

DEFINITIONS

1. crc_test_init
2. crc_test_exit

   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/string.h>
  13 #include <linux/kernel.h>
  14 #include <linux/cpufeature.h>
  15 #include <asm/switch_to.h>
  16 
  17 static unsigned long iterations = 10000;
  18 
  19 #define MAX_CRC_LENGTH 65535
  20 
  21 
  22 static int __init crc_test_init(void)
  23 {
  24         u16 crc16 = 0, verify16 = 0;
  25         u32 crc32 = 0, verify32 = 0;
  26         __le32 verify32le = 0;
  27         unsigned char *data;
  28         unsigned long i;
  29         int ret;
  30 
  31         struct crypto_shash *crct10dif_tfm;
  32         struct crypto_shash *crc32c_tfm;
  33 
  34         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
  35                 return -ENODEV;
  36 
  37         data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL);
  38         if (!data)
  39                 return -ENOMEM;
  40 
  41         crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
  42 
  43         if (IS_ERR(crct10dif_tfm)) {
  44                 pr_err("Error allocating crc-t10dif\n");
  45                 goto free_buf;
  46         }
  47 
  48         crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0);
  49 
  50         if (IS_ERR(crc32c_tfm)) {
  51                 pr_err("Error allocating crc32c\n");
  52                 goto free_16;
  53         }
  54 
  55         do {
  56                 SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm);
  57                 SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm);
  58 
  59                 crct10dif_shash->tfm = crct10dif_tfm;
  60                 ret = crypto_shash_init(crct10dif_shash);
  61 
  62                 if (ret) {
  63                         pr_err("Error initing crc-t10dif\n");
  64                         goto free_32;
  65                 }
  66 
  67 
  68                 crc32c_shash->tfm = crc32c_tfm;
  69                 ret = crypto_shash_init(crc32c_shash);
  70 
  71                 if (ret) {
  72                         pr_err("Error initing crc32c\n");
  73                         goto free_32;
  74                 }
  75 
  76                 pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations);
  77                 for (i=0; i<iterations; i++) {
  78                         size_t offset = prandom_u32_max(16);
  79                         size_t len = prandom_u32_max(MAX_CRC_LENGTH);
  80 
  81                         if (len <= offset)
  82                                 continue;
  83                         prandom_bytes(data, len);
  84                         len -= offset;
  85 
  86                         crypto_shash_update(crct10dif_shash, data+offset, len);
  87                         crypto_shash_final(crct10dif_shash, (u8 *)(&crc16));
  88                         verify16 = crc_t10dif_generic(verify16, data+offset, len);
  89 
  90 
  91                         if (crc16 != verify16) {
  92                                 pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n",
  93                                        crc16, verify16, len);
  94                                 break;
  95                         }
  96 
  97                         crypto_shash_update(crc32c_shash, data+offset, len);
  98                         crypto_shash_final(crc32c_shash, (u8 *)(&crc32));
  99                         verify32 = le32_to_cpu(verify32le);
 100                         verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len));
 101                         if (crc32 != (u32)verify32le) {
 102                                 pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n",
 103                                        crc32, verify32, len);
 104                                 break;
 105                         }
 106                 }
 107                 pr_info("crc-vpmsum_test done, completed %lu iterations\n", i);
 108         } while (0);
 109 
 110 free_32:
 111         crypto_free_shash(crc32c_tfm);
 112 
 113 free_16:
 114         crypto_free_shash(crct10dif_tfm);
 115 
 116 free_buf:
 117         kfree(data);
 118 
 119         return 0;
 120 }
 121 
 122 static void __exit crc_test_exit(void) {}
 123 
 124 module_init(crc_test_init);
 125 module_exit(crc_test_exit);
 126 module_param(iterations, long, 0400);
 127 
 128 MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
 129 MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester");
 130 MODULE_LICENSE("GPL");