dm-crypt: Add IV generation templates

hulk inclusion
category: feature
bugzilla: 20209
CVE: NA
---------------------------

Currently, the IV generation algorithms are implemented in crypt layer.
This patch implements these algorithms as templates, so that dm-crypt
layer can be simplified, and also these algorithms can be implemented in
hardware for performance.

This patch is based on the patchset originally started by
Binoy Jayan <binoy.jayan@linaro.org>
( crypto: Add IV generation algorithms
https://patchwork.kernel.org/patch/9803469/ )
Signed-off-by: NBinoy Jayan <binoy.jayan@linaro.org>
Signed-off-by: NXiongfeng Wang <xiongfeng.wang@linaro.org>
Reviewed-by: NZhangXiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

include/crypto/geniv.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * geniv.h: common interface for IV generation algorithms
+ *
+ * Copyright (C) 2018, Linaro
+ *
+ * This file define the data structure the user should pass to the template.
+ */
+
+#ifndef _CRYPTO_GENIV_H
+#define _CRYPTO_GENIV_H
+
+#include <linux/types.h>
+
+enum setkey_op {
+	SETKEY_OP_INIT,
+	SETKEY_OP_SET,
+	SETKEY_OP_WIPE,
+};
+
+struct geniv_key_info {
+	enum setkey_op keyop;
+	unsigned int tfms_count;
+	u8 *key;
+	char *ivopts;
+	sector_t iv_offset;
+	unsigned long cipher_flags;
+
+	unsigned short int sector_size;
+	unsigned int key_size;
+	unsigned int key_parts;
+	unsigned int key_mac_size;
+	unsigned int on_disk_tag_size;
+};
+
+struct geniv_req_info {
+	sector_t cc_sector;
+	unsigned int nents;
+	u8 *integrity_metadata;
+};
+
+#endif