[dpdk-dev] [RFC PATCH 1/9] security: introduce CPU Crypto action type and API

[Fan Zhang]

This patch introduce new RTE_SECURITY_ACTION_TYPE_CPU_CRYPTO action type to
security library. The type represents performing crypto operation with CPU
cycles. The patch also includes a new API to process crypto operations in
bulk and the function pointers for PMDs.

Signed-off-by: Fan Zhang <roy.fan.zhang at intel.com>
---
 lib/librte_security/rte_security.c           | 16 +++++++++
 lib/librte_security/rte_security.h           | 51 +++++++++++++++++++++++++++-
 lib/librte_security/rte_security_driver.h    | 19 +++++++++++
 lib/librte_security/rte_security_version.map |  1 +
 4 files changed, 86 insertions(+), 1 deletion(-)

diff --git a/lib/librte_security/rte_security.c b/lib/librte_security/rte_security.c
index bc81ce15d..0f85c1b59 100644
--- a/lib/librte_security/rte_security.c
+++ b/lib/librte_security/rte_security.c
@@ -141,3 +141,19 @@ rte_security_capability_get(struct rte_security_ctx *instance,
 
 	return NULL;
 }
+
+void
+rte_security_process_cpu_crypto_bulk(struct rte_security_ctx *instance,
+		struct rte_security_session *sess,
+		struct rte_security_vec buf[], void *iv[], void *aad[],
+		void *digest[], int status[], uint32_t num)
+{
+	uint32_t i;
+
+	for (i = 0; i < num; i++)
+		status[i] = -1;
+
+	RTE_FUNC_PTR_OR_RET(*instance->ops->process_cpu_crypto_bulk);
+	instance->ops->process_cpu_crypto_bulk(sess, buf, iv,
+			aad, digest, status, num);
+}
diff --git a/lib/librte_security/rte_security.h b/lib/librte_security/rte_security.h
index 96806e3a2..5a0f8901b 100644
--- a/lib/librte_security/rte_security.h
+++ b/lib/librte_security/rte_security.h
@@ -18,6 +18,7 @@ extern "C" {
 #endif
 
 #include <sys/types.h>
+#include <sys/uio.h>
 
 #include <netinet/in.h>
 #include <netinet/ip.h>
@@ -272,6 +273,20 @@ struct rte_security_pdcp_xform {
 	uint32_t hfn_threshold;
 };
 
+struct rte_security_cpu_crypto_xform {
+	/** For cipher/authentication crypto operation the authentication may
+	 * cover more content then the cipher. E.g., for IPSec ESP encryption
+	 * with AES-CBC and SHA1-HMAC, the encryption happens after the ESP
+	 * header but whole packet (apart from MAC header) is authenticated.
+	 * The cipher_offset field is used to deduct the cipher data pointer
+	 * from the buffer to be processed.
+	 *
+	 * NOTE this parameter shall be ignored by AEAD algorithms, since it
+	 * uses the same offset for cipher and authentication.
+	 */
+	int32_t cipher_offset;
+};
+
 /**
  * Security session action type.
  */
@@ -286,10 +301,14 @@ enum rte_security_session_action_type {
 	/**< All security protocol processing is performed inline during
 	 * transmission
 	 */
-	RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL
+	RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL,
 	/**< All security protocol processing including crypto is performed
 	 * on a lookaside accelerator
 	 */
+	RTE_SECURITY_ACTION_TYPE_CPU_CRYPTO
+	/**< Crypto processing for security protocol is processed by CPU
+	 * synchronously
+	 */
 };
 
 /** Security session protocol definition */
@@ -315,6 +334,7 @@ struct rte_security_session_conf {
 		struct rte_security_ipsec_xform ipsec;
 		struct rte_security_macsec_xform macsec;
 		struct rte_security_pdcp_xform pdcp;
+		struct rte_security_cpu_crypto_xform cpucrypto;
 	};
 	/**< Configuration parameters for security session */
 	struct rte_crypto_sym_xform *crypto_xform;
@@ -639,6 +659,35 @@ const struct rte_security_capability *
 rte_security_capability_get(struct rte_security_ctx *instance,
 			    struct rte_security_capability_idx *idx);
 
+/**
+ * Security vector structure, contains pointer to vector array and the length
+ * of the array
+ */
+struct rte_security_vec {
+	struct iovec *vec;
+	uint32_t num;
+};
+
+/**
+ * Processing bulk crypto workload with CPU
+ *
+ * @param	instance	security instance.
+ * @param	sess		security session
+ * @param	buf		array of buffer SGL vectors
+ * @param	iv		array of IV pointers
+ * @param	aad		array of AAD pointers
+ * @param	digest		array of digest pointers
+ * @param	status		array of status for the function to return
+ * @param	num		number of elements in each array
+ *
+ */
+__rte_experimental
+void
+rte_security_process_cpu_crypto_bulk(struct rte_security_ctx *instance,
+		struct rte_security_session *sess,
+		struct rte_security_vec buf[], void *iv[], void *aad[],
+		void *digest[], int status[], uint32_t num);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_security/rte_security_driver.h b/lib/librte_security/rte_security_driver.h
index 1b561f852..70fcb0c26 100644
--- a/lib/librte_security/rte_security_driver.h
+++ b/lib/librte_security/rte_security_driver.h
@@ -132,6 +132,23 @@ typedef int (*security_get_userdata_t)(void *device,
 typedef const struct rte_security_capability *(*security_capabilities_get_t)(
 		void *device);
 
+/**
+ * Process security operations in bulk using CPU accelerated method.
+ *
+ * @param	sess		Security session structure.
+ * @param	buf		Buffer to the vectors to be processed.
+ * @param	iv		IV pointers.
+ * @param	aad		AAD pointers.
+ * @param	digest		Digest pointers.
+ * @param	status		Array of status value.
+ * @param	num		Number of elements in each array.
+ */
+
+typedef void (*security_process_cpu_crypto_bulk_t)(
+		struct rte_security_session *sess,
+		struct rte_security_vec buf[], void *iv[], void *aad[],
+		void *digest[], int status[], uint32_t num);
+
 /** Security operations function pointer table */
 struct rte_security_ops {
 	security_session_create_t session_create;
@@ -150,6 +167,8 @@ struct rte_security_ops {
 	/**< Get userdata associated with session which processed the packet. */
 	security_capabilities_get_t capabilities_get;
 	/**< Get security capabilities. */
+	security_process_cpu_crypto_bulk_t process_cpu_crypto_bulk;
+	/**< Process data in bulk. */
 };
 
 #ifdef __cplusplus
diff --git a/lib/librte_security/rte_security_version.map b/lib/librte_security/rte_security_version.map
index 53267bf3c..2132e7a00 100644
--- a/lib/librte_security/rte_security_version.map
+++ b/lib/librte_security/rte_security_version.map
@@ -18,4 +18,5 @@ EXPERIMENTAL {
 	rte_security_get_userdata;
 	rte_security_session_stats_get;
 	rte_security_session_update;
+	rte_security_process_cpu_crypto_bulk;
 };
-- 
2.14.5