diff mbox series

[v2] cryptodev: support multiple cipher data-units

Message ID 20210404151702.2155030-1-matan@nvidia.com (mailing list archive)
State Superseded
Delegated to: akhil goyal
Headers show
Series [v2] cryptodev: support multiple cipher data-units | expand

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Commit Message

Matan Azrad April 4, 2021, 3:17 p.m. UTC
In cryptography, a block cipher is a deterministic algorithm operating
on fixed-length groups of bits, called blocks.

A block cipher consists of two paired algorithms, one for encryption
and the other for decryption. Both algorithms accept two inputs:
an input block of size n bits and a key of size k bits; and both yield
an n-bit output block. The decryption algorithm is defined to be the
inverse function of the encryption.

For AES standard the block size is 16 bytes.
For AES in XTS mode, the data to be encrypted\decrypted does not have to
be multiple of 16B size, the unit of data is called data-unit.
The data-unit size can be any size in range [16B, 2^24B], so, in this
case, a data stream is divided into N amount of equal data-units and
must be encrypted\decrypted in the same data-unit resolution.

The current cryptodev API doesn't allow the user to select a specific
data-unit length supported by the devices.
In addition, there is no definition how the IV is detected per data-unit
when single operation includes more than one data-unit.

That causes applications to use single operation per data-unit even though
all the data is continuous in memory what reduces datapath performance.

Add a new feature flag to support multiple data-unit sizes, called
RTE_CRYPTODEV_FF_CIPHER_MULITPLE_DATA_UNITS.
Add a new field in cipher capability, called dataunit_set,
where the devices can report the range of the supported data-unit sizes.
Add a new cipher transformation field, called dataunit_len, where the user
can select the data-unit length for all the operations.

All the new fields do not change the size of their structures.

Using a bitmap to report the supported data-unit sizes capability allows
the devices to report a range simply as same as the user to read it
simply. also, thus sizes are usually common and probably will be shared
among different devices.

Signed-off-by: Matan Azrad <matan@nvidia.com>
---
RFC->V1:
- Use data-unit term instead of block.
- Update cipher length description in OP.
- Improve descriptions on xform and capability.
- Improve commit log.

V1->V2:
- Fix typo: MULITPLE->MULITPLE.
- Remain only planned supported sizes for data-unit capability.



 doc/guides/cryptodevs/features/default.ini |  1 +
 doc/guides/cryptodevs/overview.rst         |  3 +++
 doc/guides/rel_notes/release_21_05.rst     |  6 ++++++
 lib/librte_cryptodev/rte_crypto_sym.h      | 17 +++++++++++++++--
 lib/librte_cryptodev/rte_cryptodev.c       |  2 ++
 lib/librte_cryptodev/rte_cryptodev.h       | 15 +++++++++++++++
 6 files changed, 42 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/doc/guides/cryptodevs/features/default.ini b/doc/guides/cryptodevs/features/default.ini
index 17b177fc45..978bb30cc1 100644
--- a/doc/guides/cryptodevs/features/default.ini
+++ b/doc/guides/cryptodevs/features/default.ini
@@ -31,6 +31,7 @@  CPU crypto             =
 Symmetric sessionless  =
 Non-Byte aligned data  =
 Sym raw data path API  =
+Cipher multiple data units =
 
 ;
 ; Supported crypto algorithms of a default crypto driver.
diff --git a/doc/guides/cryptodevs/overview.rst b/doc/guides/cryptodevs/overview.rst
index e2a1e08ec1..e24e3e1993 100644
--- a/doc/guides/cryptodevs/overview.rst
+++ b/doc/guides/cryptodevs/overview.rst
@@ -46,6 +46,9 @@  Supported Feature Flags
    - "Digest encrypted" feature flag means PMD support hash-cipher cases,
      where generated digest is appended to and encrypted with the data.
 
+   - "CIPHER_MULTIPLE_DATA_UNITS" feature flag means PMD support operations
+      on multiple data-units message.
+
 
 Supported Cipher Algorithms
 ---------------------------
diff --git a/doc/guides/rel_notes/release_21_05.rst b/doc/guides/rel_notes/release_21_05.rst
index 873140b433..1537fac4bc 100644
--- a/doc/guides/rel_notes/release_21_05.rst
+++ b/doc/guides/rel_notes/release_21_05.rst
@@ -126,6 +126,12 @@  New Features
   * Added command to display Rx queue used descriptor count.
     ``show port (port_id) rxq (queue_id) desc used count``
 
+* **Added feature to support multiple data-units on cryptodev library API.**
+
+  The Cryptodev library has been enhanced to allow operations on multiple
+  data-units for AES-XTS algorithm, the data-unit length should be set in the
+  transformation. A capability for it was added too.
+
 
 Removed Items
 -------------
diff --git a/lib/librte_cryptodev/rte_crypto_sym.h b/lib/librte_cryptodev/rte_crypto_sym.h
index 9d572ec057..5973e31f30 100644
--- a/lib/librte_cryptodev/rte_crypto_sym.h
+++ b/lib/librte_cryptodev/rte_crypto_sym.h
@@ -265,6 +265,18 @@  struct rte_crypto_cipher_xform {
 		 * which can be in the range 7 to 13 inclusive.
 		 */
 	} iv;	/**< Initialisation vector parameters */
+
+	uint32_t dataunit_len;
+	/**< When RTE_CRYPTODEV_FF_CIPHER_MULTIPLE_DATA_UNITS is enabled,
+	 * this is the data-unit length of the algorithm, otherwise or when the
+	 * value is 0, use the operation length.
+	 * The value should be in the range defined by the dataunit_set field
+	 * in the cipher capability.
+	 *
+	 * - For AES-XTS it is the size of data-unit, from IEEE Std 1619-2007.
+	 * For-each data-unit in the operation, the tweak(IV) value is
+	 * assigned consecutively starting from the operation assigned IV.
+	 */
 };
 
 /** Symmetric Authentication / Hash Algorithms
@@ -701,9 +713,10 @@  struct rte_crypto_sym_op {
 					 /**< The message length, in bytes, of the
 					  * source buffer on which the cryptographic
 					  * operation will be computed.
+					  * This is also the same as the result length.
 					  * This must be a multiple of the block size
-					  * if a block cipher is being used. This is
-					  * also the same as the result length.
+					  * or a multiple of data-unit length as
+					  * described in xform.
 					  *
 					  * @note
 					  * For SNOW 3G @ RTE_CRYPTO_AUTH_SNOW3G_UEA2,
diff --git a/lib/librte_cryptodev/rte_cryptodev.c b/lib/librte_cryptodev/rte_cryptodev.c
index 40f55a3cd0..e02e001325 100644
--- a/lib/librte_cryptodev/rte_cryptodev.c
+++ b/lib/librte_cryptodev/rte_cryptodev.c
@@ -617,6 +617,8 @@  rte_cryptodev_get_feature_name(uint64_t flag)
 		return "SYM_SESSIONLESS";
 	case RTE_CRYPTODEV_FF_NON_BYTE_ALIGNED_DATA:
 		return "NON_BYTE_ALIGNED_DATA";
+	case RTE_CRYPTODEV_FF_CIPHER_MULTIPLE_DATA_UNITS:
+		return "CIPHER_MULTIPLE_DATA_UNITS";
 	default:
 		return NULL;
 	}
diff --git a/lib/librte_cryptodev/rte_cryptodev.h b/lib/librte_cryptodev/rte_cryptodev.h
index ae34f33f69..c274e208ed 100644
--- a/lib/librte_cryptodev/rte_cryptodev.h
+++ b/lib/librte_cryptodev/rte_cryptodev.h
@@ -95,6 +95,14 @@  struct rte_crypto_param_range {
 	 */
 };
 
+/**
+ * Data-unit lengths of cipher algorithms, each bit represents single or
+ * range of data-unit lengths
+ */
+#define RTE_CRYPTO_CIPHER_DATA_UNIT_LEN_512_BYTES	(1 << 0)
+#define RTE_CRYPTO_CIPHER_DATA_UNIT_LEN_4096_BYTES	(1 << 1)
+#define RTE_CRYPTO_CIPHER_DATA_UNIT_LEN_1M_BYTES	(1 << 2)
+
 /**
  * Symmetric Crypto Capability
  */
@@ -127,6 +135,11 @@  struct rte_cryptodev_symmetric_capability {
 			/**< cipher key size range */
 			struct rte_crypto_param_range iv_size;
 			/**< Initialisation vector data size range */
+			uint32_t dataunit_set;
+			/**<
+			 * A bitmap for a set of the supported data-unit lengths
+			 * 0 for any defined length in the algorithm standard
+			 */
 		} cipher;
 		/**< Symmetric Cipher transform capabilities */
 		struct {
@@ -461,6 +474,8 @@  rte_cryptodev_asym_get_xform_enum(enum rte_crypto_asym_xform_type *xform_enum,
 /**< Support operations on data which is not byte aligned */
 #define RTE_CRYPTODEV_FF_SYM_RAW_DP			(1ULL << 24)
 /**< Support accelerator specific symmetric raw data-path APIs */
+#define RTE_CRYPTODEV_FF_CIPHER_MULTIPLE_DATA_UNITS	(1ULL << 25)
+/**< Support operations on multiple data-units message */
 
 /**
  * Get the name of a crypto device feature flag