1 files changed, 529 insertions, 0 deletions

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
new file mode 100644
index 000000000..5b493fdc1
--- /dev/null
+++ b/drivers/crypto/qce/skcipher.c
@@ -0,0 +1,529 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <crypto/aes.h>
+#include <crypto/internal/des.h>
+#include <crypto/internal/skcipher.h>
+
+#include "cipher.h"
+
+static unsigned int aes_sw_max_len = CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN;
+module_param(aes_sw_max_len, uint, 0644);
+MODULE_PARM_DESC(aes_sw_max_len,
+		 "Only use hardware for AES requests larger than this "
+		 "[0=always use hardware; anything <16 breaks AES-GCM; default="
+		 __stringify(CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN)"]");
+
+static LIST_HEAD(skcipher_algs);
+
+static void qce_skcipher_done(void *data)
+{
+	struct crypto_async_request *async_req = data;
+	struct skcipher_request *req = skcipher_request_cast(async_req);
+	struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req));
+	struct qce_device *qce = tmpl->qce;
+	struct qce_result_dump *result_buf = qce->dma.result_buf;
+	enum dma_data_direction dir_src, dir_dst;
+	u32 status;
+	int error;
+	bool diff_dst;
+
+	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;
+
+	error = qce_dma_terminate_all(&qce->dma);
+	if (error)
+		dev_dbg(qce->dev, "skcipher dma termination error (%d)\n",
+			error);
+
+	if (diff_dst)
+		dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
+	dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+
+	sg_free_table(&rctx->dst_tbl);
+
+	error = qce_check_status(qce, &status);
+	if (error < 0)
+		dev_dbg(qce->dev, "skcipher operation error (%x)\n", status);
+
+	memcpy(rctx->iv, result_buf->encr_cntr_iv, rctx->ivsize);
+	qce->async_req_done(tmpl->qce, error);
+}
+
+static int
+qce_skcipher_async_req_handle(struct crypto_async_request *async_req)
+{
+	struct skcipher_request *req = skcipher_request_cast(async_req);
+	struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req));
+	struct qce_device *qce = tmpl->qce;
+	enum dma_data_direction dir_src, dir_dst;
+	struct scatterlist *sg;
+	bool diff_dst;
+	gfp_t gfp;
+	int dst_nents, src_nents, ret;
+
+	rctx->iv = req->iv;
+	rctx->ivsize = crypto_skcipher_ivsize(skcipher);
+	rctx->cryptlen = req->cryptlen;
+
+	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 = sg_nents_for_len(req->src, req->cryptlen);
+	if (diff_dst)
+		rctx->dst_nents = sg_nents_for_len(req->dst, req->cryptlen);
+	else
+		rctx->dst_nents = rctx->src_nents;
+	if (rctx->src_nents < 0) {
+		dev_err(qce->dev, "Invalid numbers of src SG.\n");
+		return rctx->src_nents;
+	}
+	if (rctx->dst_nents < 0) {
+		dev_err(qce->dev, "Invalid numbers of dst SG.\n");
+		return -rctx->dst_nents;
+	}
+
+	rctx->dst_nents += 1;
+
+	gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+						GFP_KERNEL : GFP_ATOMIC;
+
+	ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
+	if (ret)
+		return ret;
+
+	sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
+
+	sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, req->cryptlen);
+	if (IS_ERR(sg)) {
+		ret = PTR_ERR(sg);
+		goto error_free;
+	}
+
+	sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg,
+			     QCE_RESULT_BUF_SZ);
+	if (IS_ERR(sg)) {
+		ret = PTR_ERR(sg);
+		goto error_free;
+	}
+
+	sg_mark_end(sg);
+	rctx->dst_sg = rctx->dst_tbl.sgl;
+
+	dst_nents = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+	if (!dst_nents) {
+		ret = -EIO;
+		goto error_free;
+	}
+
+	if (diff_dst) {
+		src_nents = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src);
+		if (!src_nents) {
+			ret = -EIO;
+			goto error_unmap_dst;
+		}
+		rctx->src_sg = req->src;
+	} else {
+		rctx->src_sg = rctx->dst_sg;
+		src_nents = dst_nents - 1;
+	}
+
+	ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, src_nents,
+			       rctx->dst_sg, dst_nents,
+			       qce_skcipher_done, async_req);
+	if (ret)
+		goto error_unmap_src;
+
+	qce_dma_issue_pending(&qce->dma);
+
+	ret = qce_start(async_req, tmpl->crypto_alg_type);
+	if (ret)
+		goto error_terminate;
+
+	return 0;
+
+error_terminate:
+	qce_dma_terminate_all(&qce->dma);
+error_unmap_src:
+	if (diff_dst)
+		dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src);
+error_unmap_dst:
+	dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+error_free:
+	sg_free_table(&rctx->dst_tbl);
+	return ret;
+}
+
+static int qce_skcipher_setkey(struct crypto_skcipher *ablk, const u8 *key,
+				 unsigned int keylen)
+{
+	struct crypto_tfm *tfm = crypto_skcipher_tfm(ablk);
+	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
+	unsigned long flags = to_cipher_tmpl(ablk)->alg_flags;
+	unsigned int __keylen;
+	int ret;
+
+	if (!key || !keylen)
+		return -EINVAL;
+
+	/*
+	 * AES XTS key1 = key2 not supported by crypto engine.
+	 * Revisit to request a fallback cipher in this case.
+	 */
+	if (IS_XTS(flags)) {
+		__keylen = keylen >> 1;
+		if (!memcmp(key, key + __keylen, __keylen))
+			return -ENOKEY;
+	} else {
+		__keylen = keylen;
+	}
+
+	switch (__keylen) {
+	case AES_KEYSIZE_128:
+	case AES_KEYSIZE_256:
+		memcpy(ctx->enc_key, key, keylen);
+		break;
+	case AES_KEYSIZE_192:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
+	if (!ret)
+		ctx->enc_keylen = keylen;
+	return ret;
+}
+
+static int qce_des_setkey(struct crypto_skcipher *ablk, const u8 *key,
+			  unsigned int keylen)
+{
+	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(ablk);
+	int err;
+
+	err = verify_skcipher_des_key(ablk, key);
+	if (err)
+		return err;
+
+	ctx->enc_keylen = keylen;
+	memcpy(ctx->enc_key, key, keylen);
+	return 0;
+}
+
+static int qce_des3_setkey(struct crypto_skcipher *ablk, const u8 *key,
+			   unsigned int keylen)
+{
+	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(ablk);
+	u32 _key[6];
+	int err;
+
+	err = verify_skcipher_des3_key(ablk, key);
+	if (err)
+		return err;
+
+	/*
+	 * The crypto engine does not support any two keys
+	 * being the same for triple des algorithms. The
+	 * verify_skcipher_des3_key does not check for all the
+	 * below conditions. Return -ENOKEY in case any two keys
+	 * are the same. Revisit to see if a fallback cipher
+	 * is needed to handle this condition.
+	 */
+	memcpy(_key, key, DES3_EDE_KEY_SIZE);
+	if (!((_key[0] ^ _key[2]) | (_key[1] ^ _key[3])) ||
+	    !((_key[2] ^ _key[4]) | (_key[3] ^ _key[5])) ||
+	    !((_key[0] ^ _key[4]) | (_key[1] ^ _key[5])))
+		return -ENOKEY;
+
+	ctx->enc_keylen = keylen;
+	memcpy(ctx->enc_key, key, keylen);
+	return 0;
+}
+
+static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
+	unsigned int blocksize = crypto_skcipher_blocksize(tfm);
+	int keylen;
+	int ret;
+
+	rctx->flags = tmpl->alg_flags;
+	rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
+	keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen;
+
+	/* CE does not handle 0 length messages */
+	if (!req->cryptlen)
+		return 0;
+
+	/*
+	 * ECB and CBC algorithms require message lengths to be
+	 * multiples of block size.
+	 */
+	if (IS_ECB(rctx->flags) || IS_CBC(rctx->flags))
+		if (!IS_ALIGNED(req->cryptlen, blocksize))
+			return -EINVAL;
+
+	/*
+	 * Conditions for requesting a fallback cipher
+	 * AES-192 (not supported by crypto engine (CE))
+	 * AES-XTS request with len <= 512 byte (not recommended to use CE)
+	 * AES-XTS request with len > QCE_SECTOR_SIZE and
+	 * is not a multiple of it.(Revisit this condition to check if it is
+	 * needed in all versions of CE)
+	 */
+	if (IS_AES(rctx->flags) &&
+	    ((keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256) ||
+	    (IS_XTS(rctx->flags) && ((req->cryptlen <= aes_sw_max_len) ||
+	    (req->cryptlen > QCE_SECTOR_SIZE &&
+	    req->cryptlen % QCE_SECTOR_SIZE))))) {
+		skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
+		skcipher_request_set_callback(&rctx->fallback_req,
+					      req->base.flags,
+					      req->base.complete,
+					      req->base.data);
+		skcipher_request_set_crypt(&rctx->fallback_req, req->src,
+					   req->dst, req->cryptlen, req->iv);
+		ret = encrypt ? crypto_skcipher_encrypt(&rctx->fallback_req) :
+				crypto_skcipher_decrypt(&rctx->fallback_req);
+		return ret;
+	}
+
+	return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base);
+}
+
+static int qce_skcipher_encrypt(struct skcipher_request *req)
+{
+	return qce_skcipher_crypt(req, 1);
+}
+
+static int qce_skcipher_decrypt(struct skcipher_request *req)
+{
+	return qce_skcipher_crypt(req, 0);
+}
+
+static int qce_skcipher_init(struct crypto_skcipher *tfm)
+{
+	/* take the size without the fallback skcipher_request at the end */
+	crypto_skcipher_set_reqsize(tfm, offsetof(struct qce_cipher_reqctx,
+						  fallback_req));
+	return 0;
+}
+
+static int qce_skcipher_init_fallback(struct crypto_skcipher *tfm)
+{
+	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	ctx->fallback = crypto_alloc_skcipher(crypto_tfm_alg_name(&tfm->base),
+					      0, CRYPTO_ALG_NEED_FALLBACK);
+	if (IS_ERR(ctx->fallback))
+		return PTR_ERR(ctx->fallback);
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct qce_cipher_reqctx) +
+					 crypto_skcipher_reqsize(ctx->fallback));
+	return 0;
+}
+
+static void qce_skcipher_exit(struct crypto_skcipher *tfm)
+{
+	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	crypto_free_skcipher(ctx->fallback);
+}
+
+struct qce_skcipher_def {
+	unsigned long flags;
+	const char *name;
+	const char *drv_name;
+	unsigned int blocksize;
+	unsigned int chunksize;
+	unsigned int ivsize;
+	unsigned int min_keysize;
+	unsigned int max_keysize;
+};
+
+static const struct qce_skcipher_def skcipher_def[] = {
+	{
+		.flags		= QCE_ALG_AES | QCE_MODE_ECB,
+		.name		= "ecb(aes)",
+		.drv_name	= "ecb-aes-qce",
+		.blocksize	= AES_BLOCK_SIZE,
+		.ivsize		= 0,
+		.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	= 1,
+		.chunksize	= 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 * 2,
+		.max_keysize	= AES_MAX_KEY_SIZE * 2,
+	},
+	{
+		.flags		= QCE_ALG_DES | QCE_MODE_ECB,
+		.name		= "ecb(des)",
+		.drv_name	= "ecb-des-qce",
+		.blocksize	= DES_BLOCK_SIZE,
+		.ivsize		= 0,
+		.min_keysize	= DES_KEY_SIZE,
+		.max_keysize	= 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	= DES_KEY_SIZE,
+		.max_keysize	= 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_skcipher_register_one(const struct qce_skcipher_def *def,
+				       struct qce_device *qce)
+{
+	struct qce_alg_template *tmpl;
+	struct skcipher_alg *alg;
+	int ret;
+
+	tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
+	if (!tmpl)
+		return -ENOMEM;
+
+	alg = &tmpl->alg.skcipher;
+
+	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+		 def->drv_name);
+
+	alg->base.cra_blocksize		= def->blocksize;
+	alg->chunksize			= def->chunksize;
+	alg->ivsize			= def->ivsize;
+	alg->min_keysize		= def->min_keysize;
+	alg->max_keysize		= def->max_keysize;
+	alg->setkey			= IS_3DES(def->flags) ? qce_des3_setkey :
+					  IS_DES(def->flags) ? qce_des_setkey :
+					  qce_skcipher_setkey;
+	alg->encrypt			= qce_skcipher_encrypt;
+	alg->decrypt			= qce_skcipher_decrypt;
+
+	alg->base.cra_priority		= 300;
+	alg->base.cra_flags		= CRYPTO_ALG_ASYNC |
+					  CRYPTO_ALG_ALLOCATES_MEMORY |
+					  CRYPTO_ALG_KERN_DRIVER_ONLY;
+	alg->base.cra_ctxsize		= sizeof(struct qce_cipher_ctx);
+	alg->base.cra_alignmask		= 0;
+	alg->base.cra_module		= THIS_MODULE;
+
+	if (IS_AES(def->flags)) {
+		alg->base.cra_flags    |= CRYPTO_ALG_NEED_FALLBACK;
+		alg->init		= qce_skcipher_init_fallback;
+		alg->exit		= qce_skcipher_exit;
+	} else {
+		alg->init		= qce_skcipher_init;
+	}
+
+	INIT_LIST_HEAD(&tmpl->entry);
+	tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_SKCIPHER;
+	tmpl->alg_flags = def->flags;
+	tmpl->qce = qce;
+
+	ret = crypto_register_skcipher(alg);
+	if (ret) {
+		dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name);
+		kfree(tmpl);
+		return ret;
+	}
+
+	list_add_tail(&tmpl->entry, &skcipher_algs);
+	dev_dbg(qce->dev, "%s is registered\n", alg->base.cra_name);
+	return 0;
+}
+
+static void qce_skcipher_unregister(struct qce_device *qce)
+{
+	struct qce_alg_template *tmpl, *n;
+
+	list_for_each_entry_safe(tmpl, n, &skcipher_algs, entry) {
+		crypto_unregister_skcipher(&tmpl->alg.skcipher);
+		list_del(&tmpl->entry);
+		kfree(tmpl);
+	}
+}
+
+static int qce_skcipher_register(struct qce_device *qce)
+{
+	int ret, i;
+
+	for (i = 0; i < ARRAY_SIZE(skcipher_def); i++) {
+		ret = qce_skcipher_register_one(&skcipher_def[i], qce);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+err:
+	qce_skcipher_unregister(qce);
+	return ret;
+}
+
+const struct qce_algo_ops skcipher_ops = {
+	.type = CRYPTO_ALG_TYPE_SKCIPHER,
+	.register_algs = qce_skcipher_register,
+	.unregister_algs = qce_skcipher_unregister,
+	.async_req_handle = qce_skcipher_async_req_handle,
+};