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133 lines
3.0 KiB
133 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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#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/random.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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__le32 verify32le = 0; |
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unsigned char *data; |
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u32 verify32 = 0; |
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unsigned long i; |
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__le32 crc32; |
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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 offset = prandom_u32_max(16); |
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size_t len = prandom_u32_max(MAX_CRC_LENGTH); |
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if (len <= offset) |
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continue; |
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prandom_bytes(data, len); |
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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 != 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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cond_resched(); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester"); |
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MODULE_LICENSE("GPL");
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