[dpdk-dev] [PATCH 24/24] crypto/mlx5: adjust to the multiple data unit API

[Shiri Kuzin]

In AES-XTS the data to be encrypted\decrypted does not have to be
in multiples of 16B size, the unit of data is called data-unit.

As a result of patch [1] a new field is added to the cipher capability,
called dataunit_set, where the devices can report the range of
supported data-unit sizes.

The new field enables saving the data-unit size in the session
structure to the block size pointer variable in order to support
several data-unit sizes.

[1] https://www.mail-archive.com/dev@dpdk.org/msg203590.html

Signed-off-by: Shiri Kuzin <shirik at nvidia.com>
---
 drivers/crypto/mlx5/mlx5_crypto.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/crypto/mlx5/mlx5_crypto.c b/drivers/crypto/mlx5/mlx5_crypto.c
index 25a435a999..8810872aff 100644
--- a/drivers/crypto/mlx5/mlx5_crypto.c
+++ b/drivers/crypto/mlx5/mlx5_crypto.c
@@ -48,6 +48,11 @@ struct mlx5_crypto_session {
 	 * bsf_size, bsf_p_type, encryption_order and encryption standard,
 	 * saved in big endian format.
 	 */
+	uint32_t bsp_res;
+	/*
+	 * crypto_block_size_pointer and reserved 24 bits saved in big endian
+	 * format.
+	 */
 	uint32_t iv_offset:16;
 	/* Starting point for Initialisation Vector. */
 	struct mlx5_crypto_dek *dek; /* Pointer to dek struct. */
@@ -170,6 +175,26 @@ mlx5_crypto_sym_session_configure(struct rte_cryptodev *dev,
 			 MLX5_BSF_P_TYPE_CRYPTO << MLX5_BSF_P_TYPE_OFFSET |
 			 encryption_order << MLX5_ENCRYPTION_ORDER_OFFSET |
 			 MLX5_ENCRYPTION_STANDARD_AES_XTS);
+	switch (xform->cipher.dataunit_len) {
+	case RTE_CRYPTO_CIPHER_DATA_UNIT_LEN_512_BYTES:
+		sess_private_data->bsp_res = rte_cpu_to_be_32
+					     ((uint32_t)MLX5_BLOCK_SIZE_512B <<
+					     MLX5_BLOCK_SIZE_OFFSET);
+		break;
+	case RTE_CRYPTO_CIPHER_DATA_UNIT_LEN_4096_BYTES:
+		sess_private_data->bsp_res = rte_cpu_to_be_32
+					     ((uint32_t)MLX5_BLOCK_SIZE_4096B <<
+					     MLX5_BLOCK_SIZE_OFFSET);
+		break;
+	case RTE_CRYPTO_CIPHER_DATA_UNIT_LEN_1M_BYTES:
+		sess_private_data->bsp_res = rte_cpu_to_be_32
+					     ((uint32_t)MLX5_BLOCK_SIZE_1MB <<
+					     MLX5_BLOCK_SIZE_OFFSET);
+		break;
+	default:
+		DRV_LOG(ERR, "Cipher data unit length is not supported.");
+		return -ENOTSUP;
+	}
 	sess_private_data->iv_offset = cipher->iv.offset;
 	set_sym_session_private_data(session, dev->driver_id,
 				     sess_private_data);
-- 
2.21.0