Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / crypto / crct10dif_generic.c

diff --git a/kernel/crypto/crct10dif_generic.c b/kernel/crypto/crct10dif_generic.c
new file mode 100644 (file)
index 0000000..c122961
--- /dev/null
+++ b/kernel/crypto/crct10dif_generic.c
@@ -0,0 +1,128 @@
+/*
+ * Cryptographic API.
+ *
+ * T10 Data Integrity Field CRC16 Crypto Transform
+ *
+ * Copyright (c) 2007 Oracle Corporation.  All rights reserved.
+ * Written by Martin K. Petersen <martin.petersen@oracle.com>
+ * Copyright (C) 2013 Intel Corporation
+ * Author: Tim Chen <tim.c.chen@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/crc-t10dif.h>
+#include <crypto/internal/hash.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+struct chksum_desc_ctx {
+       __u16 crc;
+};
+
+/*
+ * Steps through buffer one byte at at time, calculates reflected
+ * crc using table.
+ */
+
+static int chksum_init(struct shash_desc *desc)
+{
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+       ctx->crc = 0;
+
+       return 0;
+}
+
+static int chksum_update(struct shash_desc *desc, const u8 *data,
+                        unsigned int length)
+{
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+       ctx->crc = crc_t10dif_generic(ctx->crc, data, length);
+       return 0;
+}
+
+static int chksum_final(struct shash_desc *desc, u8 *out)
+{
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+       *(__u16 *)out = ctx->crc;
+       return 0;
+}
+
+static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len,
+                       u8 *out)
+{
+       *(__u16 *)out = crc_t10dif_generic(*crcp, data, len);
+       return 0;
+}
+
+static int chksum_finup(struct shash_desc *desc, const u8 *data,
+                       unsigned int len, u8 *out)
+{
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+       return __chksum_finup(&ctx->crc, data, len, out);
+}
+
+static int chksum_digest(struct shash_desc *desc, const u8 *data,
+                        unsigned int length, u8 *out)
+{
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+       return __chksum_finup(&ctx->crc, data, length, out);
+}
+
+static struct shash_alg alg = {
+       .digestsize             =       CRC_T10DIF_DIGEST_SIZE,
+       .init           =       chksum_init,
+       .update         =       chksum_update,
+       .final          =       chksum_final,
+       .finup          =       chksum_finup,
+       .digest         =       chksum_digest,
+       .descsize               =       sizeof(struct chksum_desc_ctx),
+       .base                   =       {
+               .cra_name               =       "crct10dif",
+               .cra_driver_name        =       "crct10dif-generic",
+               .cra_priority           =       100,
+               .cra_blocksize          =       CRC_T10DIF_BLOCK_SIZE,
+               .cra_module             =       THIS_MODULE,
+       }
+};
+
+static int __init crct10dif_mod_init(void)
+{
+       int ret;
+
+       ret = crypto_register_shash(&alg);
+       return ret;
+}
+
+static void __exit crct10dif_mod_fini(void)
+{
+       crypto_unregister_shash(&alg);
+}
+
+module_init(crct10dif_mod_init);
+module_exit(crct10dif_mod_fini);
+
+MODULE_AUTHOR("Tim Chen <tim.c.chen@linux.intel.com>");
+MODULE_DESCRIPTION("T10 DIF CRC calculation.");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CRYPTO("crct10dif");
+MODULE_ALIAS_CRYPTO("crct10dif-generic");