crypto: caam/qi2 - add skcipher algorithms

Add support to submit the following skcipher algorithms
via the DPSECI backend:
cbc({aes,des,des3_ede})
ctr(aes), rfc3686(ctr(aes))
xts(aes)
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/Kconfig

@@ -157,6 +157,7 @@ config CRYPTO_DEV_FSL_DPAA2_CAAM
 	tristate "QorIQ DPAA2 CAAM (DPSECI) driver"
 	depends on FSL_MC_DPIO
 	select CRYPTO_DEV_FSL_CAAM_COMMON
+	select CRYPTO_BLKCIPHER
 	select CRYPTO_AUTHENC
 	select CRYPTO_AEAD
 	help

drivers/crypto/caam/caamalg_qi2.c

@@ -56,6 +56,12 @@ struct caam_aead_alg {
 	bool registered;
 };
 
+struct caam_skcipher_alg {
+	struct skcipher_alg skcipher;
+	struct caam_alg_entry caam;
+	bool registered;
+};
+
 /**
  * caam_ctx - per-session context
  * @flc: Flow Contexts array
@@ -794,6 +800,248 @@ static int rfc4543_setkey(struct crypto_aead *aead,
 	return rfc4543_set_sh_desc(aead);
 }
 
+static int skcipher_setkey(struct crypto_skcipher *skcipher, const u8 *key,
+			   unsigned int keylen)
+{
+	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct caam_skcipher_alg *alg =
+		container_of(crypto_skcipher_alg(skcipher),
+			     struct caam_skcipher_alg, skcipher);
+	struct device *dev = ctx->dev;
+	struct caam_flc *flc;
+	unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
+	u32 *desc;
+	u32 ctx1_iv_off = 0;
+	const bool ctr_mode = ((ctx->cdata.algtype & OP_ALG_AAI_MASK) ==
+			       OP_ALG_AAI_CTR_MOD128);
+	const bool is_rfc3686 = alg->caam.rfc3686;
+
+	print_hex_dump_debug("key in @" __stringify(__LINE__)": ",
+			     DUMP_PREFIX_ADDRESS, 16, 4, key, keylen, 1);
+
+	/*
+	 * AES-CTR needs to load IV in CONTEXT1 reg
+	 * at an offset of 128bits (16bytes)
+	 * CONTEXT1[255:128] = IV
+	 */
+	if (ctr_mode)
+		ctx1_iv_off = 16;
+
+	/*
+	 * RFC3686 specific:
+	 *	| CONTEXT1[255:128] = {NONCE, IV, COUNTER}
+	 *	| *key = {KEY, NONCE}
+	 */
+	if (is_rfc3686) {
+		ctx1_iv_off = 16 + CTR_RFC3686_NONCE_SIZE;
+		keylen -= CTR_RFC3686_NONCE_SIZE;
+	}
+
+	ctx->cdata.keylen = keylen;
+	ctx->cdata.key_virt = key;
+	ctx->cdata.key_inline = true;
+
+	/* skcipher_encrypt shared descriptor */
+	flc = &ctx->flc[ENCRYPT];
+	desc = flc->sh_desc;
+	cnstr_shdsc_skcipher_encap(desc, &ctx->cdata, ivsize, is_rfc3686,
+				   ctx1_iv_off);
+	flc->flc[1] = cpu_to_caam32(desc_len(desc)); /* SDL */
+	dma_sync_single_for_device(dev, ctx->flc_dma[ENCRYPT],
+				   sizeof(flc->flc) + desc_bytes(desc),
+				   ctx->dir);
+
+	/* skcipher_decrypt shared descriptor */
+	flc = &ctx->flc[DECRYPT];
+	desc = flc->sh_desc;
+	cnstr_shdsc_skcipher_decap(desc, &ctx->cdata, ivsize, is_rfc3686,
+				   ctx1_iv_off);
+	flc->flc[1] = cpu_to_caam32(desc_len(desc)); /* SDL */
+	dma_sync_single_for_device(dev, ctx->flc_dma[DECRYPT],
+				   sizeof(flc->flc) + desc_bytes(desc),
+				   ctx->dir);
+
+	return 0;
+}
+
+static int xts_skcipher_setkey(struct crypto_skcipher *skcipher, const u8 *key,
+			       unsigned int keylen)
+{
+	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct device *dev = ctx->dev;
+	struct caam_flc *flc;
+	u32 *desc;
+
+	if (keylen != 2 * AES_MIN_KEY_SIZE  && keylen != 2 * AES_MAX_KEY_SIZE) {
+		dev_err(dev, "key size mismatch\n");
+		crypto_skcipher_set_flags(skcipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+
+	ctx->cdata.keylen = keylen;
+	ctx->cdata.key_virt = key;
+	ctx->cdata.key_inline = true;
+
+	/* xts_skcipher_encrypt shared descriptor */
+	flc = &ctx->flc[ENCRYPT];
+	desc = flc->sh_desc;
+	cnstr_shdsc_xts_skcipher_encap(desc, &ctx->cdata);
+	flc->flc[1] = cpu_to_caam32(desc_len(desc)); /* SDL */
+	dma_sync_single_for_device(dev, ctx->flc_dma[ENCRYPT],
+				   sizeof(flc->flc) + desc_bytes(desc),
+				   ctx->dir);
+
+	/* xts_skcipher_decrypt shared descriptor */
+	flc = &ctx->flc[DECRYPT];
+	desc = flc->sh_desc;
+	cnstr_shdsc_xts_skcipher_decap(desc, &ctx->cdata);
+	flc->flc[1] = cpu_to_caam32(desc_len(desc)); /* SDL */
+	dma_sync_single_for_device(dev, ctx->flc_dma[DECRYPT],
+				   sizeof(flc->flc) + desc_bytes(desc),
+				   ctx->dir);
+
+	return 0;
+}
+
+static struct skcipher_edesc *skcipher_edesc_alloc(struct skcipher_request *req)
+{
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct caam_request *req_ctx = skcipher_request_ctx(req);
+	struct dpaa2_fl_entry *in_fle = &req_ctx->fd_flt[1];
+	struct dpaa2_fl_entry *out_fle = &req_ctx->fd_flt[0];
+	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct device *dev = ctx->dev;
+	gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+		       GFP_KERNEL : GFP_ATOMIC;
+	int src_nents, mapped_src_nents, dst_nents = 0, mapped_dst_nents = 0;
+	struct skcipher_edesc *edesc;
+	dma_addr_t iv_dma;
+	u8 *iv;
+	int ivsize = crypto_skcipher_ivsize(skcipher);
+	int dst_sg_idx, qm_sg_ents, qm_sg_bytes;
+	struct dpaa2_sg_entry *sg_table;
+
+	src_nents = sg_nents_for_len(req->src, req->cryptlen);
+	if (unlikely(src_nents < 0)) {
+		dev_err(dev, "Insufficient bytes (%d) in src S/G\n",
+			req->cryptlen);
+		return ERR_PTR(src_nents);
+	}
+
+	if (unlikely(req->dst != req->src)) {
+		dst_nents = sg_nents_for_len(req->dst, req->cryptlen);
+		if (unlikely(dst_nents < 0)) {
+			dev_err(dev, "Insufficient bytes (%d) in dst S/G\n",
+				req->cryptlen);
+			return ERR_PTR(dst_nents);
+		}
+
+		mapped_src_nents = dma_map_sg(dev, req->src, src_nents,
+					      DMA_TO_DEVICE);
+		if (unlikely(!mapped_src_nents)) {
+			dev_err(dev, "unable to map source\n");
+			return ERR_PTR(-ENOMEM);
+		}
+
+		mapped_dst_nents = dma_map_sg(dev, req->dst, dst_nents,
+					      DMA_FROM_DEVICE);
+		if (unlikely(!mapped_dst_nents)) {
+			dev_err(dev, "unable to map destination\n");
+			dma_unmap_sg(dev, req->src, src_nents, DMA_TO_DEVICE);
+			return ERR_PTR(-ENOMEM);
+		}
+	} else {
+		mapped_src_nents = dma_map_sg(dev, req->src, src_nents,
+					      DMA_BIDIRECTIONAL);
+		if (unlikely(!mapped_src_nents)) {
+			dev_err(dev, "unable to map source\n");
+			return ERR_PTR(-ENOMEM);
+		}
+	}
+
+	qm_sg_ents = 1 + mapped_src_nents;
+	dst_sg_idx = qm_sg_ents;
+
+	qm_sg_ents += mapped_dst_nents > 1 ? mapped_dst_nents : 0;
+	qm_sg_bytes = qm_sg_ents * sizeof(struct dpaa2_sg_entry);
+	if (unlikely(offsetof(struct skcipher_edesc, sgt) + qm_sg_bytes +
+		     ivsize > CAAM_QI_MEMCACHE_SIZE)) {
+		dev_err(dev, "No space for %d S/G entries and/or %dB IV\n",
+			qm_sg_ents, ivsize);
+		caam_unmap(dev, req->src, req->dst, src_nents, dst_nents, 0,
+			   0, 0, 0);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/* allocate space for base edesc, link tables and IV */
+	edesc = qi_cache_zalloc(GFP_DMA | flags);
+	if (unlikely(!edesc)) {
+		dev_err(dev, "could not allocate extended descriptor\n");
+		caam_unmap(dev, req->src, req->dst, src_nents, dst_nents, 0,
+			   0, 0, 0);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/* Make sure IV is located in a DMAable area */
+	sg_table = &edesc->sgt[0];
+	iv = (u8 *)(sg_table + qm_sg_ents);
+	memcpy(iv, req->iv, ivsize);
+
+	iv_dma = dma_map_single(dev, iv, ivsize, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, iv_dma)) {
+		dev_err(dev, "unable to map IV\n");
+		caam_unmap(dev, req->src, req->dst, src_nents, dst_nents, 0,
+			   0, 0, 0);
+		qi_cache_free(edesc);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	edesc->src_nents = src_nents;
+	edesc->dst_nents = dst_nents;
+	edesc->iv_dma = iv_dma;
+	edesc->qm_sg_bytes = qm_sg_bytes;
+
+	dma_to_qm_sg_one(sg_table, iv_dma, ivsize, 0);
+	sg_to_qm_sg_last(req->src, mapped_src_nents, sg_table + 1, 0);
+
+	if (mapped_dst_nents > 1)
+		sg_to_qm_sg_last(req->dst, mapped_dst_nents, sg_table +
+				 dst_sg_idx, 0);
+
+	edesc->qm_sg_dma = dma_map_single(dev, sg_table, edesc->qm_sg_bytes,
+					  DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, edesc->qm_sg_dma)) {
+		dev_err(dev, "unable to map S/G table\n");
+		caam_unmap(dev, req->src, req->dst, src_nents, dst_nents,
+			   iv_dma, ivsize, 0, 0);
+		qi_cache_free(edesc);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	memset(&req_ctx->fd_flt, 0, sizeof(req_ctx->fd_flt));
+	dpaa2_fl_set_final(in_fle, true);
+	dpaa2_fl_set_len(in_fle, req->cryptlen + ivsize);
+	dpaa2_fl_set_len(out_fle, req->cryptlen);
+
+	dpaa2_fl_set_format(in_fle, dpaa2_fl_sg);
+	dpaa2_fl_set_addr(in_fle, edesc->qm_sg_dma);
+
+	if (req->src == req->dst) {
+		dpaa2_fl_set_format(out_fle, dpaa2_fl_sg);
+		dpaa2_fl_set_addr(out_fle, edesc->qm_sg_dma +
+				  sizeof(*sg_table));
+	} else if (mapped_dst_nents > 1) {
+		dpaa2_fl_set_format(out_fle, dpaa2_fl_sg);
+		dpaa2_fl_set_addr(out_fle, edesc->qm_sg_dma + dst_sg_idx *
+				  sizeof(*sg_table));
+	} else {
+		dpaa2_fl_set_format(out_fle, dpaa2_fl_single);
+		dpaa2_fl_set_addr(out_fle, sg_dma_address(req->dst));
+	}
+
+	return edesc;
+}
+
 static void aead_unmap(struct device *dev, struct aead_edesc *edesc,
 		       struct aead_request *req)
 {
@@ -805,6 +1053,16 @@ static void aead_unmap(struct device *dev, struct aead_edesc *edesc,
 	dma_unmap_single(dev, edesc->assoclen_dma, 4, DMA_TO_DEVICE);
 }
 
+static void skcipher_unmap(struct device *dev, struct skcipher_edesc *edesc,
+			   struct skcipher_request *req)
+{
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	int ivsize = crypto_skcipher_ivsize(skcipher);
+
+	caam_unmap(dev, req->src, req->dst, edesc->src_nents, edesc->dst_nents,
+		   edesc->iv_dma, ivsize, edesc->qm_sg_dma, edesc->qm_sg_bytes);
+}
+
 static void aead_encrypt_done(void *cbk_ctx, u32 status)
 {
 	struct crypto_async_request *areq = cbk_ctx;
@@ -930,6 +1188,138 @@ static int ipsec_gcm_decrypt(struct aead_request *req)
 	return aead_decrypt(req);
 }
 
+static void skcipher_encrypt_done(void *cbk_ctx, u32 status)
+{
+	struct crypto_async_request *areq = cbk_ctx;
+	struct skcipher_request *req = skcipher_request_cast(areq);
+	struct caam_request *req_ctx = to_caam_req(areq);
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct skcipher_edesc *edesc = req_ctx->edesc;
+	int ecode = 0;
+	int ivsize = crypto_skcipher_ivsize(skcipher);
+
+	dev_dbg(ctx->dev, "%s %d: err 0x%x\n", __func__, __LINE__, status);
+
+	if (unlikely(status)) {
+		caam_qi2_strstatus(ctx->dev, status);
+		ecode = -EIO;
+	}
+
+	print_hex_dump_debug("dstiv  @" __stringify(__LINE__)": ",
+			     DUMP_PREFIX_ADDRESS, 16, 4, req->iv,
+			     edesc->src_nents > 1 ? 100 : ivsize, 1);
+	caam_dump_sg(KERN_DEBUG, "dst    @" __stringify(__LINE__)": ",
+		     DUMP_PREFIX_ADDRESS, 16, 4, req->dst,
+		     edesc->dst_nents > 1 ? 100 : req->cryptlen, 1);
+
+	skcipher_unmap(ctx->dev, edesc, req);
+
+	/*
+	 * The crypto API expects us to set the IV (req->iv) to the last
+	 * ciphertext block. This is used e.g. by the CTS mode.
+	 */
+	scatterwalk_map_and_copy(req->iv, req->dst, req->cryptlen - ivsize,
+				 ivsize, 0);
+
+	qi_cache_free(edesc);
+	skcipher_request_complete(req, ecode);
+}
+
+static void skcipher_decrypt_done(void *cbk_ctx, u32 status)
+{
+	struct crypto_async_request *areq = cbk_ctx;
+	struct skcipher_request *req = skcipher_request_cast(areq);
+	struct caam_request *req_ctx = to_caam_req(areq);
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct skcipher_edesc *edesc = req_ctx->edesc;
+	int ecode = 0;
+	int ivsize = crypto_skcipher_ivsize(skcipher);
+
+	dev_dbg(ctx->dev, "%s %d: err 0x%x\n", __func__, __LINE__, status);
+
+	if (unlikely(status)) {
+		caam_qi2_strstatus(ctx->dev, status);
+		ecode = -EIO;
+	}
+
+	print_hex_dump_debug("dstiv  @" __stringify(__LINE__)": ",
+			     DUMP_PREFIX_ADDRESS, 16, 4, req->iv,
+			     edesc->src_nents > 1 ? 100 : ivsize, 1);
+	caam_dump_sg(KERN_DEBUG, "dst    @" __stringify(__LINE__)": ",
+		     DUMP_PREFIX_ADDRESS, 16, 4, req->dst,
+		     edesc->dst_nents > 1 ? 100 : req->cryptlen, 1);
+
+	skcipher_unmap(ctx->dev, edesc, req);
+	qi_cache_free(edesc);
+	skcipher_request_complete(req, ecode);
+}
+
+static int skcipher_encrypt(struct skcipher_request *req)
+{
+	struct skcipher_edesc *edesc;
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct caam_request *caam_req = skcipher_request_ctx(req);
+	int ret;
+
+	/* allocate extended descriptor */
+	edesc = skcipher_edesc_alloc(req);
+	if (IS_ERR(edesc))
+		return PTR_ERR(edesc);
+
+	caam_req->flc = &ctx->flc[ENCRYPT];
+	caam_req->flc_dma = ctx->flc_dma[ENCRYPT];
+	caam_req->cbk = skcipher_encrypt_done;
+	caam_req->ctx = &req->base;
+	caam_req->edesc = edesc;
+	ret = dpaa2_caam_enqueue(ctx->dev, caam_req);
+	if (ret != -EINPROGRESS &&
+	    !(ret == -EBUSY && req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
+		skcipher_unmap(ctx->dev, edesc, req);
+		qi_cache_free(edesc);
+	}
+
+	return ret;
+}
+
+static int skcipher_decrypt(struct skcipher_request *req)
+{
+	struct skcipher_edesc *edesc;
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct caam_request *caam_req = skcipher_request_ctx(req);
+	int ivsize = crypto_skcipher_ivsize(skcipher);
+	int ret;
+
+	/* allocate extended descriptor */
+	edesc = skcipher_edesc_alloc(req);
+	if (IS_ERR(edesc))
+		return PTR_ERR(edesc);
+
+	/*
+	 * The crypto API expects us to set the IV (req->iv) to the last
+	 * ciphertext block.
+	 */
+	scatterwalk_map_and_copy(req->iv, req->src, req->cryptlen - ivsize,
+				 ivsize, 0);
+
+	caam_req->flc = &ctx->flc[DECRYPT];
+	caam_req->flc_dma = ctx->flc_dma[DECRYPT];
+	caam_req->cbk = skcipher_decrypt_done;
+	caam_req->ctx = &req->base;
+	caam_req->edesc = edesc;
+	ret = dpaa2_caam_enqueue(ctx->dev, caam_req);
+	if (ret != -EINPROGRESS &&
+	    !(ret == -EBUSY && req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
+		skcipher_unmap(ctx->dev, edesc, req);
+		qi_cache_free(edesc);
+	}
+
+	return ret;
+}
+
 static int caam_cra_init(struct caam_ctx *ctx, struct caam_alg_entry *caam,
 			 bool uses_dkp)
 {
@@ -958,6 +1348,16 @@ static int caam_cra_init(struct caam_ctx *ctx, struct caam_alg_entry *caam,
 	return 0;
 }
 
+static int caam_cra_init_skcipher(struct crypto_skcipher *tfm)
+{
+	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+	struct caam_skcipher_alg *caam_alg =
+		container_of(alg, typeof(*caam_alg), skcipher);
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct caam_request));
+	return caam_cra_init(crypto_skcipher_ctx(tfm), &caam_alg->caam, false);
+}
+
 static int caam_cra_init_aead(struct crypto_aead *tfm)
 {
 	struct aead_alg *alg = crypto_aead_alg(tfm);
@@ -976,11 +1376,124 @@ static void caam_exit_common(struct caam_ctx *ctx)
 			       DMA_ATTR_SKIP_CPU_SYNC);
 }
 
+static void caam_cra_exit(struct crypto_skcipher *tfm)
+{
+	caam_exit_common(crypto_skcipher_ctx(tfm));
+}
+
 static void caam_cra_exit_aead(struct crypto_aead *tfm)
 {
 	caam_exit_common(crypto_aead_ctx(tfm));
 }
 
+static struct caam_skcipher_alg driver_algs[] = {
+	{
+		.skcipher = {
+			.base = {
+				.cra_name = "cbc(aes)",
+				.cra_driver_name = "cbc-aes-caam-qi2",
+				.cra_blocksize = AES_BLOCK_SIZE,
+			},
+			.setkey = skcipher_setkey,
+			.encrypt = skcipher_encrypt,
+			.decrypt = skcipher_decrypt,
+			.min_keysize = AES_MIN_KEY_SIZE,
+			.max_keysize = AES_MAX_KEY_SIZE,
+			.ivsize = AES_BLOCK_SIZE,
+		},
+		.caam.class1_alg_type = OP_ALG_ALGSEL_AES | OP_ALG_AAI_CBC,
+	},
+	{
+		.skcipher = {
+			.base = {
+				.cra_name = "cbc(des3_ede)",
+				.cra_driver_name = "cbc-3des-caam-qi2",
+				.cra_blocksize = DES3_EDE_BLOCK_SIZE,
+			},
+			.setkey = skcipher_setkey,
+			.encrypt = skcipher_encrypt,
+			.decrypt = skcipher_decrypt,
+			.min_keysize = DES3_EDE_KEY_SIZE,
+			.max_keysize = DES3_EDE_KEY_SIZE,
+			.ivsize = DES3_EDE_BLOCK_SIZE,
+		},
+		.caam.class1_alg_type = OP_ALG_ALGSEL_3DES | OP_ALG_AAI_CBC,
+	},
+	{
+		.skcipher = {
+			.base = {
+				.cra_name = "cbc(des)",
+				.cra_driver_name = "cbc-des-caam-qi2",
+				.cra_blocksize = DES_BLOCK_SIZE,
+			},
+			.setkey = skcipher_setkey,
+			.encrypt = skcipher_encrypt,
+			.decrypt = skcipher_decrypt,
+			.min_keysize = DES_KEY_SIZE,
+			.max_keysize = DES_KEY_SIZE,
+			.ivsize = DES_BLOCK_SIZE,
+		},
+		.caam.class1_alg_type = OP_ALG_ALGSEL_DES | OP_ALG_AAI_CBC,
+	},
+	{
+		.skcipher = {
+			.base = {
+				.cra_name = "ctr(aes)",
+				.cra_driver_name = "ctr-aes-caam-qi2",
+				.cra_blocksize = 1,
+			},
+			.setkey = skcipher_setkey,
+			.encrypt = skcipher_encrypt,
+			.decrypt = skcipher_decrypt,
+			.min_keysize = AES_MIN_KEY_SIZE,
+			.max_keysize = AES_MAX_KEY_SIZE,
+			.ivsize = AES_BLOCK_SIZE,
+			.chunksize = AES_BLOCK_SIZE,
+		},
+		.caam.class1_alg_type = OP_ALG_ALGSEL_AES |
+					OP_ALG_AAI_CTR_MOD128,
+	},
+	{
+		.skcipher = {
+			.base = {
+				.cra_name = "rfc3686(ctr(aes))",
+				.cra_driver_name = "rfc3686-ctr-aes-caam-qi2",
+				.cra_blocksize = 1,
+			},
+			.setkey = skcipher_setkey,
+			.encrypt = skcipher_encrypt,
+			.decrypt = skcipher_decrypt,
+			.min_keysize = AES_MIN_KEY_SIZE +
+				       CTR_RFC3686_NONCE_SIZE,
+			.max_keysize = AES_MAX_KEY_SIZE +
+				       CTR_RFC3686_NONCE_SIZE,
+			.ivsize = CTR_RFC3686_IV_SIZE,
+			.chunksize = AES_BLOCK_SIZE,
+		},
+		.caam = {
+			.class1_alg_type = OP_ALG_ALGSEL_AES |
+					   OP_ALG_AAI_CTR_MOD128,
+			.rfc3686 = true,
+		},
+	},
+	{
+		.skcipher = {
+			.base = {
+				.cra_name = "xts(aes)",
+				.cra_driver_name = "xts-aes-caam-qi2",
+				.cra_blocksize = AES_BLOCK_SIZE,
+			},
+			.setkey = xts_skcipher_setkey,
+			.encrypt = skcipher_encrypt,
+			.decrypt = skcipher_decrypt,
+			.min_keysize = 2 * AES_MIN_KEY_SIZE,
+			.max_keysize = 2 * AES_MAX_KEY_SIZE,
+			.ivsize = AES_BLOCK_SIZE,
+		},
+		.caam.class1_alg_type = OP_ALG_ALGSEL_AES | OP_ALG_AAI_XTS,
+	}
+};
+
 static struct caam_aead_alg driver_aeads[] = {
 	{
 		.aead = {
@@ -2143,6 +2656,19 @@ static struct caam_aead_alg driver_aeads[] = {
 	},
 };
 
+static void caam_skcipher_alg_init(struct caam_skcipher_alg *t_alg)
+{
+	struct skcipher_alg *alg = &t_alg->skcipher;
+
+	alg->base.cra_module = THIS_MODULE;
+	alg->base.cra_priority = CAAM_CRA_PRIORITY;
+	alg->base.cra_ctxsize = sizeof(struct caam_ctx);
+	alg->base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY;
+
+	alg->init = caam_cra_init_skcipher;
+	alg->exit = caam_cra_exit;
+}
+
 static void caam_aead_alg_init(struct caam_aead_alg *t_alg)
 {
 	struct aead_alg *alg = &t_alg->aead;
@@ -2701,6 +3227,35 @@ static int dpaa2_caam_probe(struct fsl_mc_device *dpseci_dev)
 	}
 
 	/* register crypto algorithms the device supports */
+	for (i = 0; i < ARRAY_SIZE(driver_algs); i++) {
+		struct caam_skcipher_alg *t_alg = driver_algs + i;
+		u32 alg_sel = t_alg->caam.class1_alg_type & OP_ALG_ALGSEL_MASK;
+
+		/* Skip DES algorithms if not supported by device */
+		if (!priv->sec_attr.des_acc_num &&
+		    (alg_sel == OP_ALG_ALGSEL_3DES ||
+		     alg_sel == OP_ALG_ALGSEL_DES))
+			continue;
+
+		/* Skip AES algorithms if not supported by device */
+		if (!priv->sec_attr.aes_acc_num &&
+		    alg_sel == OP_ALG_ALGSEL_AES)
+			continue;
+
+		t_alg->caam.dev = dev;
+		caam_skcipher_alg_init(t_alg);
+
+		err = crypto_register_skcipher(&t_alg->skcipher);
+		if (err) {
+			dev_warn(dev, "%s alg registration failed: %d\n",
+				 t_alg->skcipher.base.cra_driver_name, err);
+			continue;
+		}
+
+		t_alg->registered = true;
+		registered = true;
+	}
+
 	for (i = 0; i < ARRAY_SIZE(driver_aeads); i++) {
 		struct caam_aead_alg *t_alg = driver_aeads + i;
 		u32 c1_alg_sel = t_alg->caam.class1_alg_type &
@@ -2774,6 +3329,13 @@ static int __cold dpaa2_caam_remove(struct fsl_mc_device *ls_dev)
 			crypto_unregister_aead(&t_alg->aead);
 	}
 
+	for (i = 0; i < ARRAY_SIZE(driver_algs); i++) {
+		struct caam_skcipher_alg *t_alg = driver_algs + i;
+
+		if (t_alg->registered)
+			crypto_unregister_skcipher(&t_alg->skcipher);
+	}
+
 	dpaa2_dpseci_disable(priv);
 	dpaa2_dpseci_dpio_free(priv);
 	dpaa2_dpseci_free(priv);

drivers/crypto/caam/caamalg_qi2.h

@@ -140,6 +140,24 @@ struct aead_edesc {
 	struct dpaa2_sg_entry sgt[0];
 };
 
+/*
+ * skcipher_edesc - s/w-extended skcipher descriptor
+ * @src_nents: number of segments in input scatterlist
+ * @dst_nents: number of segments in output scatterlist
+ * @iv_dma: dma address of iv for checking continuity and link table
+ * @qm_sg_bytes: length of dma mapped qm_sg space
+ * @qm_sg_dma: I/O virtual address of h/w link table
+ * @sgt: the h/w link table, followed by IV
+ */
+struct skcipher_edesc {
+	int src_nents;
+	int dst_nents;
+	dma_addr_t iv_dma;
+	int qm_sg_bytes;
+	dma_addr_t qm_sg_dma;
+	struct dpaa2_sg_entry sgt[0];
+};
+
 /**
  * caam_flc - Flow Context (FLC)
  * @flc: Flow Context options
@@ -167,7 +185,7 @@ enum optype {
  * @flc_dma: I/O virtual address of Flow Context
  * @cbk: Callback function to invoke when job is completed
  * @ctx: arbit context attached with request by the application
- * @edesc: extended descriptor; points to aead_edesc
+ * @edesc: extended descriptor; points to one of {skcipher,aead}_edesc
  */
 struct caam_request {
 	struct dpaa2_fl_entry fd_flt[2];