~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/x86/crypto/crct10dif-pclmul_glue.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Cryptographic API.
  3  *
  4  * T10 Data Integrity Field CRC16 Crypto Transform using PCLMULQDQ Instructions
  5  *
  6  * Copyright (C) 2013 Intel Corporation
  7  * Author: Tim Chen <tim.c.chen@linux.intel.com>
  8  *
  9  * This program is free software; you can redistribute it and/or modify it
 10  * under the terms of the GNU General Public License as published by the Free
 11  * Software Foundation; either version 2 of the License, or (at your option)
 12  * any later version.
 13  *
 14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 15  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 16  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 17  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 18  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 19  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 20  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 21  * SOFTWARE.
 22  *
 23  */
 24 
 25 #include <linux/types.h>
 26 #include <linux/module.h>
 27 #include <linux/crc-t10dif.h>
 28 #include <crypto/internal/hash.h>
 29 #include <linux/init.h>
 30 #include <linux/string.h>
 31 #include <linux/kernel.h>
 32 #include <asm/fpu/api.h>
 33 #include <asm/cpufeatures.h>
 34 #include <asm/cpu_device_id.h>
 35 
 36 asmlinkage __u16 crc_t10dif_pcl(__u16 crc, const unsigned char *buf,
 37                                 size_t len);
 38 
 39 struct chksum_desc_ctx {
 40         __u16 crc;
 41 };
 42 
 43 /*
 44  * Steps through buffer one byte at at time, calculates reflected
 45  * crc using table.
 46  */
 47 
 48 static int chksum_init(struct shash_desc *desc)
 49 {
 50         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
 51 
 52         ctx->crc = 0;
 53 
 54         return 0;
 55 }
 56 
 57 static int chksum_update(struct shash_desc *desc, const u8 *data,
 58                          unsigned int length)
 59 {
 60         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
 61 
 62         if (irq_fpu_usable()) {
 63                 kernel_fpu_begin();
 64                 ctx->crc = crc_t10dif_pcl(ctx->crc, data, length);
 65                 kernel_fpu_end();
 66         } else
 67                 ctx->crc = crc_t10dif_generic(ctx->crc, data, length);
 68         return 0;
 69 }
 70 
 71 static int chksum_final(struct shash_desc *desc, u8 *out)
 72 {
 73         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
 74 
 75         *(__u16 *)out = ctx->crc;
 76         return 0;
 77 }
 78 
 79 static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len,
 80                         u8 *out)
 81 {
 82         if (irq_fpu_usable()) {
 83                 kernel_fpu_begin();
 84                 *(__u16 *)out = crc_t10dif_pcl(*crcp, data, len);
 85                 kernel_fpu_end();
 86         } else
 87                 *(__u16 *)out = crc_t10dif_generic(*crcp, data, len);
 88         return 0;
 89 }
 90 
 91 static int chksum_finup(struct shash_desc *desc, const u8 *data,
 92                         unsigned int len, u8 *out)
 93 {
 94         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
 95 
 96         return __chksum_finup(&ctx->crc, data, len, out);
 97 }
 98 
 99 static int chksum_digest(struct shash_desc *desc, const u8 *data,
100                          unsigned int length, u8 *out)
101 {
102         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
103 
104         return __chksum_finup(&ctx->crc, data, length, out);
105 }
106 
107 static struct shash_alg alg = {
108         .digestsize             =       CRC_T10DIF_DIGEST_SIZE,
109         .init           =       chksum_init,
110         .update         =       chksum_update,
111         .final          =       chksum_final,
112         .finup          =       chksum_finup,
113         .digest         =       chksum_digest,
114         .descsize               =       sizeof(struct chksum_desc_ctx),
115         .base                   =       {
116                 .cra_name               =       "crct10dif",
117                 .cra_driver_name        =       "crct10dif-pclmul",
118                 .cra_priority           =       200,
119                 .cra_blocksize          =       CRC_T10DIF_BLOCK_SIZE,
120                 .cra_module             =       THIS_MODULE,
121         }
122 };
123 
124 static const struct x86_cpu_id crct10dif_cpu_id[] = {
125         X86_FEATURE_MATCH(X86_FEATURE_PCLMULQDQ),
126         {}
127 };
128 MODULE_DEVICE_TABLE(x86cpu, crct10dif_cpu_id);
129 
130 static int __init crct10dif_intel_mod_init(void)
131 {
132         if (!x86_match_cpu(crct10dif_cpu_id))
133                 return -ENODEV;
134 
135         return crypto_register_shash(&alg);
136 }
137 
138 static void __exit crct10dif_intel_mod_fini(void)
139 {
140         crypto_unregister_shash(&alg);
141 }
142 
143 module_init(crct10dif_intel_mod_init);
144 module_exit(crct10dif_intel_mod_fini);
145 
146 MODULE_AUTHOR("Tim Chen <tim.c.chen@linux.intel.com>");
147 MODULE_DESCRIPTION("T10 DIF CRC calculation accelerated with PCLMULQDQ.");
148 MODULE_LICENSE("GPL");
149 
150 MODULE_ALIAS_CRYPTO("crct10dif");
151 MODULE_ALIAS_CRYPTO("crct10dif-pclmul");
152 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp