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1 | /* |
2 | * CRC vpmsum tester | |
3 | * Copyright 2017 Daniel Axtens, IBM Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/crc-t10dif.h> | |
11 | #include <linux/crc32.h> | |
12 | #include <crypto/internal/hash.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/cpufeature.h> | |
18 | #include <asm/switch_to.h> | |
19 | ||
20 | static unsigned long iterations = 10000; | |
21 | ||
22 | #define MAX_CRC_LENGTH 65535 | |
23 | ||
24 | ||
25 | static int __init crc_test_init(void) | |
26 | { | |
27 | u16 crc16 = 0, verify16 = 0; | |
28 | u32 crc32 = 0, verify32 = 0; | |
29 | __le32 verify32le = 0; | |
30 | unsigned char *data; | |
31 | unsigned long i; | |
32 | int ret; | |
33 | ||
34 | struct crypto_shash *crct10dif_tfm; | |
35 | struct crypto_shash *crc32c_tfm; | |
36 | ||
37 | if (!cpu_has_feature(CPU_FTR_ARCH_207S)) | |
38 | return -ENODEV; | |
39 | ||
40 | data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL); | |
41 | if (!data) | |
42 | return -ENOMEM; | |
43 | ||
44 | crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0); | |
45 | ||
46 | if (IS_ERR(crct10dif_tfm)) { | |
47 | pr_err("Error allocating crc-t10dif\n"); | |
48 | goto free_buf; | |
49 | } | |
50 | ||
51 | crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0); | |
52 | ||
53 | if (IS_ERR(crc32c_tfm)) { | |
54 | pr_err("Error allocating crc32c\n"); | |
55 | goto free_16; | |
56 | } | |
57 | ||
58 | do { | |
59 | SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm); | |
60 | SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm); | |
61 | ||
62 | crct10dif_shash->tfm = crct10dif_tfm; | |
63 | ret = crypto_shash_init(crct10dif_shash); | |
64 | ||
65 | if (ret) { | |
66 | pr_err("Error initing crc-t10dif\n"); | |
67 | goto free_32; | |
68 | } | |
69 | ||
70 | ||
71 | crc32c_shash->tfm = crc32c_tfm; | |
72 | ret = crypto_shash_init(crc32c_shash); | |
73 | ||
74 | if (ret) { | |
75 | pr_err("Error initing crc32c\n"); | |
76 | goto free_32; | |
77 | } | |
78 | ||
79 | pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations); | |
80 | for (i=0; i<iterations; i++) { | |
81 | size_t len, offset; | |
82 | ||
83 | get_random_bytes(data, MAX_CRC_LENGTH); | |
84 | get_random_bytes(&len, sizeof(len)); | |
85 | get_random_bytes(&offset, sizeof(offset)); | |
86 | ||
87 | len %= MAX_CRC_LENGTH; | |
88 | offset &= 15; | |
89 | if (len <= offset) | |
90 | continue; | |
91 | len -= offset; | |
92 | ||
93 | crypto_shash_update(crct10dif_shash, data+offset, len); | |
94 | crypto_shash_final(crct10dif_shash, (u8 *)(&crc16)); | |
95 | verify16 = crc_t10dif_generic(verify16, data+offset, len); | |
96 | ||
97 | ||
98 | if (crc16 != verify16) { | |
99 | pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n", | |
100 | crc16, verify16, len); | |
101 | break; | |
102 | } | |
103 | ||
104 | crypto_shash_update(crc32c_shash, data+offset, len); | |
105 | crypto_shash_final(crc32c_shash, (u8 *)(&crc32)); | |
106 | verify32 = le32_to_cpu(verify32le); | |
107 | verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len)); | |
108 | if (crc32 != (u32)verify32le) { | |
109 | pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n", | |
110 | crc32, verify32, len); | |
111 | break; | |
112 | } | |
113 | } | |
114 | pr_info("crc-vpmsum_test done, completed %lu iterations\n", i); | |
115 | } while (0); | |
116 | ||
117 | free_32: | |
118 | crypto_free_shash(crc32c_tfm); | |
119 | ||
120 | free_16: | |
121 | crypto_free_shash(crct10dif_tfm); | |
122 | ||
123 | free_buf: | |
124 | kfree(data); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static void __exit crc_test_exit(void) {} | |
130 | ||
131 | module_init(crc_test_init); | |
132 | module_exit(crc_test_exit); | |
133 | module_param(iterations, long, 0400); | |
134 | ||
135 | MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>"); | |
136 | MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester"); | |
137 | MODULE_LICENSE("GPL"); |