138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
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* CRC vpmsum tester
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* Copyright 2017 Daniel Axtens, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/crc-t10dif.h>
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#include <linux/crc32.h>
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#include <crypto/internal/hash.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/cpufeature.h>
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#include <asm/switch_to.h>
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static unsigned long iterations = 10000;
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#define MAX_CRC_LENGTH 65535
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static int __init crc_test_init(void)
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{
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u16 crc16 = 0, verify16 = 0;
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u32 crc32 = 0, verify32 = 0;
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__le32 verify32le = 0;
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unsigned char *data;
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unsigned long i;
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int ret;
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struct crypto_shash *crct10dif_tfm;
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struct crypto_shash *crc32c_tfm;
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if (!cpu_has_feature(CPU_FTR_ARCH_207S))
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return -ENODEV;
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data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
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if (IS_ERR(crct10dif_tfm)) {
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pr_err("Error allocating crc-t10dif\n");
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goto free_buf;
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}
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crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0);
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if (IS_ERR(crc32c_tfm)) {
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pr_err("Error allocating crc32c\n");
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goto free_16;
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}
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do {
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SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm);
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SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm);
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crct10dif_shash->tfm = crct10dif_tfm;
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ret = crypto_shash_init(crct10dif_shash);
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if (ret) {
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pr_err("Error initing crc-t10dif\n");
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goto free_32;
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}
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crc32c_shash->tfm = crc32c_tfm;
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ret = crypto_shash_init(crc32c_shash);
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if (ret) {
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pr_err("Error initing crc32c\n");
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goto free_32;
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}
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pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations);
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for (i=0; i<iterations; i++) {
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size_t len, offset;
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get_random_bytes(data, MAX_CRC_LENGTH);
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get_random_bytes(&len, sizeof(len));
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get_random_bytes(&offset, sizeof(offset));
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len %= MAX_CRC_LENGTH;
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offset &= 15;
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if (len <= offset)
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continue;
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len -= offset;
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crypto_shash_update(crct10dif_shash, data+offset, len);
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crypto_shash_final(crct10dif_shash, (u8 *)(&crc16));
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verify16 = crc_t10dif_generic(verify16, data+offset, len);
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if (crc16 != verify16) {
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pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n",
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crc16, verify16, len);
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break;
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}
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crypto_shash_update(crc32c_shash, data+offset, len);
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crypto_shash_final(crc32c_shash, (u8 *)(&crc32));
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verify32 = le32_to_cpu(verify32le);
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verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len));
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if (crc32 != (u32)verify32le) {
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pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n",
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crc32, verify32, len);
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break;
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}
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}
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pr_info("crc-vpmsum_test done, completed %lu iterations\n", i);
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} while (0);
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free_32:
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crypto_free_shash(crc32c_tfm);
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free_16:
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crypto_free_shash(crct10dif_tfm);
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free_buf:
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kfree(data);
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return 0;
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}
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static void __exit crc_test_exit(void) {}
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module_init(crc_test_init);
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module_exit(crc_test_exit);
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module_param(iterations, long, 0400);
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MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
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MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester");
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MODULE_LICENSE("GPL");
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