![Daniel Axtens](/assets/img/avatar_default.png)
vpmsum implementations often don't kick in for short test vectors. This is a simple test module that does a configurable number of random tests, each up to 64kB and each with random offsets. Both CRC-T10DIF and CRC32C are tested. Cc: Anton Blanchard <anton@samba.org> Signed-off-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
|
|
* CRC vpmsum tester
|
|
* Copyright 2017 Daniel Axtens, IBM Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/crc-t10dif.h>
|
|
#include <linux/crc32.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/cpufeature.h>
|
|
#include <asm/switch_to.h>
|
|
|
|
static unsigned long iterations = 10000;
|
|
|
|
#define MAX_CRC_LENGTH 65535
|
|
|
|
|
|
static int __init crc_test_init(void)
|
|
{
|
|
u16 crc16 = 0, verify16 = 0;
|
|
u32 crc32 = 0, verify32 = 0;
|
|
__le32 verify32le = 0;
|
|
unsigned char *data;
|
|
unsigned long i;
|
|
int ret;
|
|
|
|
struct crypto_shash *crct10dif_tfm;
|
|
struct crypto_shash *crc32c_tfm;
|
|
|
|
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
|
|
return -ENODEV;
|
|
|
|
data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
|
|
|
|
if (IS_ERR(crct10dif_tfm)) {
|
|
pr_err("Error allocating crc-t10dif\n");
|
|
goto free_buf;
|
|
}
|
|
|
|
crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0);
|
|
|
|
if (IS_ERR(crc32c_tfm)) {
|
|
pr_err("Error allocating crc32c\n");
|
|
goto free_16;
|
|
}
|
|
|
|
do {
|
|
SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm);
|
|
SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm);
|
|
|
|
crct10dif_shash->tfm = crct10dif_tfm;
|
|
ret = crypto_shash_init(crct10dif_shash);
|
|
|
|
if (ret) {
|
|
pr_err("Error initing crc-t10dif\n");
|
|
goto free_32;
|
|
}
|
|
|
|
|
|
crc32c_shash->tfm = crc32c_tfm;
|
|
ret = crypto_shash_init(crc32c_shash);
|
|
|
|
if (ret) {
|
|
pr_err("Error initing crc32c\n");
|
|
goto free_32;
|
|
}
|
|
|
|
pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations);
|
|
for (i=0; i<iterations; i++) {
|
|
size_t len, offset;
|
|
|
|
get_random_bytes(data, MAX_CRC_LENGTH);
|
|
get_random_bytes(&len, sizeof(len));
|
|
get_random_bytes(&offset, sizeof(offset));
|
|
|
|
len %= MAX_CRC_LENGTH;
|
|
offset &= 15;
|
|
if (len <= offset)
|
|
continue;
|
|
len -= offset;
|
|
|
|
crypto_shash_update(crct10dif_shash, data+offset, len);
|
|
crypto_shash_final(crct10dif_shash, (u8 *)(&crc16));
|
|
verify16 = crc_t10dif_generic(verify16, data+offset, len);
|
|
|
|
|
|
if (crc16 != verify16) {
|
|
pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n",
|
|
crc16, verify16, len);
|
|
break;
|
|
}
|
|
|
|
crypto_shash_update(crc32c_shash, data+offset, len);
|
|
crypto_shash_final(crc32c_shash, (u8 *)(&crc32));
|
|
verify32 = le32_to_cpu(verify32le);
|
|
verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len));
|
|
if (crc32 != (u32)verify32le) {
|
|
pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n",
|
|
crc32, verify32, len);
|
|
break;
|
|
}
|
|
}
|
|
pr_info("crc-vpmsum_test done, completed %lu iterations\n", i);
|
|
} while (0);
|
|
|
|
free_32:
|
|
crypto_free_shash(crc32c_tfm);
|
|
|
|
free_16:
|
|
crypto_free_shash(crct10dif_tfm);
|
|
|
|
free_buf:
|
|
kfree(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit crc_test_exit(void) {}
|
|
|
|
module_init(crc_test_init);
|
|
module_exit(crc_test_exit);
|
|
module_param(iterations, long, 0400);
|
|
|
|
MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
|
|
MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester");
|
|
MODULE_LICENSE("GPL");
|