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Date:	Thu,  3 Apr 2014 19:18:01 +0300
From:	Stanimir Varbanov <svarbanov@...sol.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
Cc:	Stanimir Varbanov <svarbanov@...sol.com>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: [PATCH 4/9] crypto: qce: Add ablkcipher algorithms

Here is the implementation of AES, DES and 3DES crypto API
callbacks, the crypto register alg function, the async request
handler and its dma done callback function.

Signed-off-by: Stanimir Varbanov <svarbanov@...sol.com>
---
 drivers/crypto/qce/ablkcipher.c | 397 ++++++++++++++++++++++++++++++++++++++++
 drivers/crypto/qce/cipher.h     |  62 +++++++
 2 files changed, 459 insertions(+)
 create mode 100644 drivers/crypto/qce/ablkcipher.c
 create mode 100644 drivers/crypto/qce/cipher.h

diff --git a/drivers/crypto/qce/ablkcipher.c b/drivers/crypto/qce/ablkcipher.c
new file mode 100644
index 000000000000..364162187c8c
--- /dev/null
+++ b/drivers/crypto/qce/ablkcipher.c
@@ -0,0 +1,397 @@
+/*
+ * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <crypto/aes.h>
+#include <crypto/algapi.h>
+#include <crypto/des.h>
+
+#include "dma.h"
+#include "core.h"
+#include "common.h"
+#include "cipher.h"
+
+static void qce_ablkcipher_dma_done(void *data)
+{
+	struct crypto_async_request *async_req = data;
+	struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
+	struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
+	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(async_req->tfm);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm);
+	struct qce_device *qce = tmpl->qce;
+	struct qce_result_dump *result = qce->dma.result_buf;
+	enum dma_data_direction dir_src, dir_dst;
+	u32 status;
+	int error;
+
+	dir_src = (req->src == req->dst) ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
+	dir_dst = (req->src == req->dst) ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
+
+	qce_dma_terminate_all(&qce->dma);
+
+	if (req->src != req->dst)
+		qce_unmapsg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src,
+			    rctx->dst_chained);
+	qce_unmapsg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst,
+		    rctx->dst_chained);
+
+	sg_free_table(&rctx->dst_tbl);
+
+	error = qce_check_status(qce, &status);
+	if (error < 0)
+		dev_err(qce->dev, "ablkcipher operation error (%x)\n", status);
+
+	if (IS_ECB(rctx->flags))
+		goto done;
+
+	memcpy(ctx->iv, result->encr_cntr_iv, rctx->ivsize);
+
+done:
+	tmpl->async_req_done(tmpl->qce, error);
+}
+
+static int
+qce_ablkcipher_async_req_handle(struct crypto_async_request *async_req)
+{
+	struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
+	struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
+	struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm);
+	struct qce_device *qce = tmpl->qce;
+	enum dma_data_direction dir_src, dir_dst;
+	struct scatterlist *sg;
+	bool diff_dst;
+	gfp_t gfp;
+	int rc;
+
+	rctx->iv = req->info;
+	rctx->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
+	rctx->cryptlen = req->nbytes;
+
+	diff_dst = (req->src != req->dst) ? true : false;
+
+	dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
+	dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
+
+	rctx->src_nents = qce_countsg(req->src, req->nbytes,
+				      &rctx->src_chained);
+	if (diff_dst) {
+		rctx->dst_nents = qce_countsg(req->dst, req->nbytes,
+					      &rctx->dst_chained);
+	} else {
+		rctx->dst_nents = rctx->src_nents;
+		rctx->dst_chained = rctx->src_chained;
+	}
+
+	rctx->dst_nents += 1;
+
+	gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+						GFP_KERNEL : GFP_ATOMIC;
+
+	rc = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
+	if (rc)
+		return rc;
+
+	sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
+
+	sg = qce_sgtable_add(&rctx->dst_tbl, req->dst);
+	if (IS_ERR(sg)) {
+		rc = PTR_ERR(sg);
+		goto error_free;
+	}
+
+	sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg);
+	if (IS_ERR(sg)) {
+		rc = PTR_ERR(sg);
+		goto error_free;
+	}
+
+	sg_mark_end(sg);
+	rctx->dst_sg = rctx->dst_tbl.sgl;
+
+	rc = qce_mapsg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst,
+		       rctx->dst_chained);
+	if (rc < 0)
+		goto error_free;
+
+	if (diff_dst) {
+		rc = qce_mapsg(qce->dev, req->src, rctx->src_nents, dir_src,
+			       rctx->src_chained);
+		if (rc < 0)
+			goto error_unmap_dst;
+		rctx->src_sg = req->src;
+	} else {
+		rctx->src_sg = rctx->dst_sg;
+	}
+
+	rc = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, rctx->src_nents,
+			      rctx->dst_sg, rctx->dst_nents,
+			      qce_ablkcipher_dma_done, async_req);
+	if (rc)
+		goto error_unmap_src;
+
+	qce_dma_issue_pending(&qce->dma);
+
+	rc = qce_start(async_req, tmpl->crypto_alg_type, req->nbytes, 0);
+	if (rc)
+		goto error_terminate;
+
+	return 0;
+
+error_terminate:
+	qce_dma_terminate_all(&qce->dma);
+error_unmap_src:
+	if (diff_dst)
+		qce_unmapsg(qce->dev, req->src, rctx->src_nents, dir_src,
+			    rctx->src_chained);
+error_unmap_dst:
+	qce_unmapsg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst,
+		    rctx->dst_chained);
+error_free:
+	sg_free_table(&rctx->dst_tbl);
+	return rc;
+}
+
+static int qce_ablkcipher_setkey(struct crypto_ablkcipher *ablk, const u8 *key,
+				 unsigned int keylen)
+{
+	struct crypto_tfm *tfm = crypto_ablkcipher_tfm(ablk);
+	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(&ablk->base);
+	u32 flags = tmpl->alg_flags;
+	int ret = 0;
+
+	if (!key || !keylen)
+		return -EINVAL;
+
+	if (IS_AES(flags)) {
+		switch (keylen) {
+		case AES_KEYSIZE_128:
+		case AES_KEYSIZE_256:
+			break;
+		default:
+			goto badkey;
+		}
+	} else if (IS_DES(flags)) {
+		u32 tmp[DES_EXPKEY_WORDS];
+
+		if (keylen != QCE_DES_KEY_SIZE)
+			goto badkey;
+
+		ret = des_ekey(tmp, key);
+		if (!ret && crypto_ablkcipher_get_flags(ablk) &
+		    CRYPTO_TFM_REQ_WEAK_KEY)
+			goto weakkey;
+	} else if (IS_3DES(flags)) {
+		if (keylen != DES3_EDE_KEY_SIZE)
+			goto badkey;
+	}
+
+	ctx->enc_keylen = keylen;
+	memcpy(ctx->enc_key, key, keylen);
+	return 0;
+badkey:
+	crypto_ablkcipher_set_flags(ablk, CRYPTO_TFM_RES_BAD_KEY_LEN);
+	return -EINVAL;
+weakkey:
+	crypto_ablkcipher_set_flags(ablk, CRYPTO_TFM_RES_WEAK_KEY);
+	return -EINVAL;
+}
+
+static int qce_ablkcipher_encrypt(struct ablkcipher_request *req)
+{
+	struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(req->base.tfm);
+
+	rctx->flags = QCE_ENCRYPT | tmpl->alg_flags;
+	return tmpl->async_req_queue(tmpl->qce, &req->base);
+}
+
+static int qce_ablkcipher_decrypt(struct ablkcipher_request *req)
+{
+	struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(req->base.tfm);
+
+	rctx->flags = QCE_DECRYPT | tmpl->alg_flags;
+	return tmpl->async_req_queue(tmpl->qce, &req->base);
+}
+
+static int qce_ablkcipher_init(struct crypto_tfm *tfm)
+{
+	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	memset(ctx, 0, sizeof(*ctx));
+	get_random_bytes(ctx->iv, QCE_MAX_IV_SIZE);
+	tfm->crt_ablkcipher.reqsize = sizeof(struct qce_cipher_reqctx);
+	return 0;
+}
+
+static void qce_ablkcipher_exit(struct crypto_tfm *tfm)
+{
+}
+
+struct qce_ablkcipher_def {
+	u32 flags;
+	const char *name;
+	const char *drv_name;
+	unsigned int blocksize;
+	unsigned int ivsize;
+	unsigned int min_keysize;
+	unsigned int max_keysize;
+};
+
+static const struct qce_ablkcipher_def ablkcipher_def[] = {
+	{
+		.flags		= QCE_ALG_AES | QCE_MODE_ECB,
+		.name		= "ecb(aes)",
+		.drv_name	= "ecb-aes-qce",
+		.blocksize	= AES_BLOCK_SIZE,
+		.ivsize		= AES_BLOCK_SIZE,
+		.min_keysize	= AES_MIN_KEY_SIZE,
+		.max_keysize	= AES_MAX_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_AES | QCE_MODE_CBC,
+		.name		= "cbc(aes)",
+		.drv_name	= "cbc-aes-qce",
+		.blocksize	= AES_BLOCK_SIZE,
+		.ivsize		= AES_BLOCK_SIZE,
+		.min_keysize	= AES_MIN_KEY_SIZE,
+		.max_keysize	= AES_MAX_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_AES | QCE_MODE_CTR,
+		.name		= "ctr(aes)",
+		.drv_name	= "ctr-aes-qce",
+		.blocksize	= AES_BLOCK_SIZE,
+		.ivsize		= AES_BLOCK_SIZE,
+		.min_keysize	= AES_MIN_KEY_SIZE,
+		.max_keysize	= AES_MAX_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_AES | QCE_MODE_XTS,
+		.name		= "xts(aes)",
+		.drv_name	= "xts-aes-qce",
+		.blocksize	= AES_BLOCK_SIZE,
+		.ivsize		= AES_BLOCK_SIZE,
+		.min_keysize	= AES_MIN_KEY_SIZE,
+		.max_keysize	= AES_MAX_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_DES | QCE_MODE_ECB,
+		.name		= "ecb(des)",
+		.drv_name	= "ecb-des-qce",
+		.blocksize	= DES_BLOCK_SIZE,
+		.ivsize		= 0,
+		.min_keysize	= QCE_DES_KEY_SIZE,
+		.max_keysize	= QCE_DES_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_DES | QCE_MODE_CBC,
+		.name		= "cbc(des)",
+		.drv_name	= "cbc-des-qce",
+		.blocksize	= DES_BLOCK_SIZE,
+		.ivsize		= DES_BLOCK_SIZE,
+		.min_keysize	= QCE_DES_KEY_SIZE,
+		.max_keysize	= QCE_DES_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_3DES | QCE_MODE_ECB,
+		.name		= "ecb(des3_ede)",
+		.drv_name	= "ecb-3des-qce",
+		.blocksize	= DES3_EDE_BLOCK_SIZE,
+		.ivsize		= 0,
+		.min_keysize	= DES3_EDE_KEY_SIZE,
+		.max_keysize	= DES3_EDE_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_3DES | QCE_MODE_CBC,
+		.name		= "cbc(des3_ede)",
+		.drv_name	= "cbc-3des-qce",
+		.blocksize	= DES3_EDE_BLOCK_SIZE,
+		.ivsize		= DES3_EDE_BLOCK_SIZE,
+		.min_keysize	= DES3_EDE_KEY_SIZE,
+		.max_keysize	= DES3_EDE_KEY_SIZE,
+	},
+};
+
+static int qce_ablk_register_one(const struct qce_ablkcipher_def *def,
+				 struct qce_device *qce,
+				 struct qce_algo_ops *ops)
+{
+	struct qce_alg_template *tmpl;
+	struct crypto_alg *alg;
+	struct list_head *alg_list = &qce->alg_list;
+	int rc;
+
+	tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
+	if (!tmpl)
+		return -ENOMEM;
+
+	alg = &tmpl->alg.crypto;
+
+	snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+	snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+		 def->drv_name);
+
+	alg->cra_blocksize = def->blocksize;
+	alg->cra_ablkcipher.ivsize = def->ivsize;
+	alg->cra_ablkcipher.min_keysize = def->min_keysize;
+	alg->cra_ablkcipher.max_keysize = def->max_keysize;
+	alg->cra_ablkcipher.setkey = qce_ablkcipher_setkey;
+	alg->cra_ablkcipher.encrypt = qce_ablkcipher_encrypt;
+	alg->cra_ablkcipher.decrypt = qce_ablkcipher_decrypt;
+
+	alg->cra_priority = 300;
+	alg->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
+	alg->cra_ctxsize = sizeof(struct qce_cipher_ctx);
+	alg->cra_alignmask = 0;
+	alg->cra_type = &crypto_ablkcipher_type;
+	alg->cra_module = THIS_MODULE;
+	alg->cra_init = qce_ablkcipher_init;
+	alg->cra_exit = qce_ablkcipher_exit;
+	INIT_LIST_HEAD(&alg->cra_list);
+
+	INIT_LIST_HEAD(&tmpl->entry);
+	tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_ABLKCIPHER;
+	tmpl->alg_flags = def->flags;
+	tmpl->qce = qce;
+	tmpl->async_req_queue = ops->async_req_queue;
+	tmpl->async_req_done = ops->async_req_done;
+	ops->async_req_handle = qce_ablkcipher_async_req_handle;
+
+	rc = crypto_register_alg(alg);
+	if (rc) {
+		dev_err(qce->dev, "%s registration failed\n", alg->cra_name);
+		kfree(tmpl);
+		return rc;
+	}
+
+	list_add_tail(&tmpl->entry, alg_list);
+	dev_info(qce->dev, "%s is registered\n", alg->cra_name);
+	return 0;
+}
+
+int qce_ablkcipher_register(struct qce_device *qce, struct qce_algo_ops *ops)
+{
+	int rc, i;
+
+	for (i = 0; i < ARRAY_SIZE(ablkcipher_def); i++) {
+		rc = qce_ablk_register_one(&ablkcipher_def[i], qce, ops);
+		if (rc)
+			return rc;
+	}
+
+	return 0;
+}
diff --git a/drivers/crypto/qce/cipher.h b/drivers/crypto/qce/cipher.h
new file mode 100644
index 000000000000..df6d31b4a241
--- /dev/null
+++ b/drivers/crypto/qce/cipher.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CIPHER_H_
+#define _CIPHER_H_
+
+struct qce_cipher_ctx {
+	u8 iv[QCE_MAX_IV_SIZE];
+	u8 enc_key[QCE_MAX_KEY_SIZE];
+	unsigned int enc_keylen;
+};
+
+/*
+ * @flags: operation flags
+ * @iv: pointer to the IV
+ * @ivsize: IV size
+ * @src_nents: source entries
+ * @dst_nents: destination entries
+ * @src_chained: is source chained
+ * @dst_chained: is destination chained
+ * @result_sg: scatterlist used for result buffer
+ * @dst_tbl: destination sg table
+ * @dst_sg: destination sg pointer table beginning;
+ * @src_tbl: source sg table
+ * @src_sg: source sg pointer table beginning;
+ * @cryptlen: crypto length
+ */
+struct qce_cipher_reqctx {
+	u32 flags;
+	u8 *iv;
+	unsigned int ivsize;
+	int src_nents;
+	int dst_nents;
+	bool src_chained;
+	bool dst_chained;
+	struct scatterlist result_sg;
+	struct sg_table dst_tbl;
+	struct scatterlist *dst_sg;
+	struct sg_table src_tbl;
+	struct scatterlist *src_sg;
+	unsigned int cryptlen;
+};
+
+static inline struct qce_alg_template *to_cipher_tmpl(struct crypto_tfm *tfm)
+{
+	struct crypto_alg *alg = tfm->__crt_alg;
+	return container_of(alg, struct qce_alg_template, alg.crypto);
+}
+
+int qce_ablkcipher_register(struct qce_device *qce, struct qce_algo_ops *ops);
+
+#endif /* _CIPHER_H_ */
-- 
1.8.4.4

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