diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/lib/crc-t10dif.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/lib/crc-t10dif.c')
-rw-r--r-- | kernel/lib/crc-t10dif.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/kernel/lib/crc-t10dif.c b/kernel/lib/crc-t10dif.c new file mode 100644 index 000000000..dfe6ec17c --- /dev/null +++ b/kernel/lib/crc-t10dif.c @@ -0,0 +1,64 @@ +/* + * 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> +#include <linux/err.h> +#include <linux/init.h> +#include <crypto/hash.h> +#include <linux/static_key.h> + +static struct crypto_shash *crct10dif_tfm; +static struct static_key crct10dif_fallback __read_mostly; + +__u16 crc_t10dif(const unsigned char *buffer, size_t len) +{ + struct { + struct shash_desc shash; + char ctx[2]; + } desc; + int err; + + if (static_key_false(&crct10dif_fallback)) + return crc_t10dif_generic(0, buffer, len); + + desc.shash.tfm = crct10dif_tfm; + desc.shash.flags = 0; + *(__u16 *)desc.ctx = 0; + + err = crypto_shash_update(&desc.shash, buffer, len); + BUG_ON(err); + + return *(__u16 *)desc.ctx; +} +EXPORT_SYMBOL(crc_t10dif); + +static int __init crc_t10dif_mod_init(void) +{ + crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0); + if (IS_ERR(crct10dif_tfm)) { + static_key_slow_inc(&crct10dif_fallback); + crct10dif_tfm = NULL; + } + return 0; +} + +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); + +MODULE_DESCRIPTION("T10 DIF CRC calculation"); +MODULE_LICENSE("GPL"); +MODULE_SOFTDEP("pre: crct10dif"); |