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/random.h> 13 #include <linux/string.h> 14 #include <linux/kernel.h> 15 #include <linux/cpufeature.h> 16 #include <asm/switch_to.h> 17 18 static unsigned long iterations = 10000; 19 20 #define MAX_CRC_LENGTH 65535 21 22 23 static int __init crc_test_init(void) 24 { 25 u16 crc16 = 0, verify16 = 0; 26 __le32 verify32le = 0; 27 unsigned char *data; 28 u32 verify32 = 0; 29 unsigned long i; 30 __le32 crc32; 31 int ret; 32 33 struct crypto_shash *crct10dif_tfm; 34 struct crypto_shash *crc32c_tfm; 35 36 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 37 return -ENODEV; 38 39 data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL); 40 if (!data) 41 return -ENOMEM; 42 43 crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0); 44 45 if (IS_ERR(crct10dif_tfm)) { 46 pr_err("Error allocating crc-t10dif\n"); 47 goto free_buf; 48 } 49 50 crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0); 51 52 if (IS_ERR(crc32c_tfm)) { 53 pr_err("Error allocating crc32c\n"); 54 goto free_16; 55 } 56 57 do { 58 SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm); 59 SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm); 60 61 crct10dif_shash->tfm = crct10dif_tfm; 62 ret = crypto_shash_init(crct10dif_shash); 63 64 if (ret) { 65 pr_err("Error initing crc-t10dif\n"); 66 goto free_32; 67 } 68 69 70 crc32c_shash->tfm = crc32c_tfm; 71 ret = crypto_shash_init(crc32c_shash); 72 73 if (ret) { 74 pr_err("Error initing crc32c\n"); 75 goto free_32; 76 } 77 78 pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations); 79 for (i=0; i<iterations; i++) { 80 size_t offset = get_random_u32_below(16); 81 size_t len = get_random_u32_below(MAX_CRC_LENGTH); 82 83 if (len <= offset) 84 continue; 85 get_random_bytes(data, len); 86 len -= offset; 87 88 crypto_shash_update(crct10dif_shash, data+offset, len); 89 crypto_shash_final(crct10dif_shash, (u8 *)(&crc16)); 90 verify16 = crc_t10dif_generic(verify16, data+offset, len); 91 92 93 if (crc16 != verify16) { 94 pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n", 95 crc16, verify16, len); 96 break; 97 } 98 99 crypto_shash_update(crc32c_shash, data+offset, len); 100 crypto_shash_final(crc32c_shash, (u8 *)(&crc32)); 101 verify32 = le32_to_cpu(verify32le); 102 verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len)); 103 if (crc32 != verify32le) { 104 pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n", 105 crc32, verify32, len); 106 break; 107 } 108 cond_resched(); 109 } 110 pr_info("crc-vpmsum_test done, completed %lu iterations\n", i); 111 } while (0); 112 113 free_32: 114 crypto_free_shash(crc32c_tfm); 115 116 free_16: 117 crypto_free_shash(crct10dif_tfm); 118 119 free_buf: 120 kfree(data); 121 122 return 0; 123 } 124 125 static void __exit crc_test_exit(void) {} 126 127 module_init(crc_test_init); 128 module_exit(crc_test_exit); 129 module_param(iterations, long, 0400); 130 131 MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>"); 132 MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester"); 133 MODULE_LICENSE("GPL"); 134