Blame view
lib/crc-t10dif.c
1.47 KB
f11f594ed [SCSI] lib: Add s... |
1 2 3 4 5 6 7 8 9 10 11 12 13 |
/* * T10 Data Integrity Field CRC16 calculation * * Copyright (c) 2007 Oracle Corporation. All rights reserved. * Written by Martin K. Petersen <martin.petersen@oracle.com> * * This source code is licensed under the GNU General Public License, * Version 2. See the file COPYING for more details. */ #include <linux/types.h> #include <linux/module.h> #include <linux/crc-t10dif.h> |
68411521c Reinstate "crypto... |
14 15 16 |
#include <linux/err.h> #include <linux/init.h> #include <crypto/hash.h> |
26052f9b9 crypto: crct10dif... |
17 |
#include <linux/static_key.h> |
f11f594ed [SCSI] lib: Add s... |
18 |
|
68411521c Reinstate "crypto... |
19 |
static struct crypto_shash *crct10dif_tfm; |
26052f9b9 crypto: crct10dif... |
20 |
static struct static_key crct10dif_fallback __read_mostly; |
f11f594ed [SCSI] lib: Add s... |
21 22 23 |
__u16 crc_t10dif(const unsigned char *buffer, size_t len) { |
68411521c Reinstate "crypto... |
24 25 26 27 28 |
struct { struct shash_desc shash; char ctx[2]; } desc; int err; |
26052f9b9 crypto: crct10dif... |
29 30 |
if (static_key_false(&crct10dif_fallback)) return crc_t10dif_generic(0, buffer, len); |
68411521c Reinstate "crypto... |
31 32 33 |
desc.shash.tfm = crct10dif_tfm; desc.shash.flags = 0; *(__u16 *)desc.ctx = 0; |
f11f594ed [SCSI] lib: Add s... |
34 |
|
68411521c Reinstate "crypto... |
35 36 |
err = crypto_shash_update(&desc.shash, buffer, len); BUG_ON(err); |
f11f594ed [SCSI] lib: Add s... |
37 |
|
68411521c Reinstate "crypto... |
38 |
return *(__u16 *)desc.ctx; |
f11f594ed [SCSI] lib: Add s... |
39 40 |
} EXPORT_SYMBOL(crc_t10dif); |
68411521c Reinstate "crypto... |
41 42 43 |
static int __init crc_t10dif_mod_init(void) { crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0); |
26052f9b9 crypto: crct10dif... |
44 45 46 47 48 |
if (IS_ERR(crct10dif_tfm)) { static_key_slow_inc(&crct10dif_fallback); crct10dif_tfm = NULL; } return 0; |
68411521c Reinstate "crypto... |
49 50 51 52 53 54 55 56 57 |
} static void __exit crc_t10dif_mod_fini(void) { crypto_free_shash(crct10dif_tfm); } module_init(crc_t10dif_mod_init); module_exit(crc_t10dif_mod_fini); |
f11f594ed [SCSI] lib: Add s... |
58 59 |
MODULE_DESCRIPTION("T10 DIF CRC calculation"); MODULE_LICENSE("GPL"); |
68411521c Reinstate "crypto... |
60 |
MODULE_SOFTDEP("pre: crct10dif"); |