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/*-
 *
 *   Copyright(c) 2015 Intel Corporation. All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RTE_CRYPTODEV_H_
#define _RTE_CRYPTODEV_H_

/**
 * @file rte_cryptodev.h
 *
 * RTE Cryptographic Device APIs
 *
 * Defines RTE Crypto Device APIs for the provisioning of cipher and
 * authentication operations.
 *
 * @warning
 * @b EXPERIMENTAL: this API may change without prior notice
 */

#ifdef __cplusplus
extern "C" {
#endif

#include "stddef.h"

#include "rte_crypto.h"
#include "rte_dev.h"

#define CRYPTODEV_NAME_NULL_PMD		("cryptodev_null_pmd")
/**< Null crypto PMD device name */
#define CRYPTODEV_NAME_AESNI_MB_PMD	("cryptodev_aesni_mb_pmd")
/**< AES-NI Multi buffer PMD device name */
#define CRYPTODEV_NAME_QAT_PMD		("cryptodev_qat_pmd")
/**< Intel QAT PMD device name */

/** Crypto device type */
enum rte_cryptodev_type {
	RTE_CRYPTODEV_NULL_PMD = 1,	/**< Null crypto PMD */
	RTE_CRYPTODEV_AESNI_MB_PMD,	/**< AES-NI multi buffer PMD */
	RTE_CRYPTODEV_QAT_PMD,		/**< QAT PMD */
};

/* Logging Macros */

#define CDEV_LOG_ERR(fmt, args...)					\
		RTE_LOG(ERR, CRYPTODEV, "%s() line %u: " fmt "\n",	\
				__func__, __LINE__, ## args)

#define CDEV_PMD_LOG_ERR(dev, fmt, args...)				\
		RTE_LOG(ERR, CRYPTODEV, "[%s] %s() line %u: " fmt "\n", \
				dev, __func__, __LINE__, ## args)

#ifdef RTE_LIBRTE_CRYPTODEV_DEBUG
#define CDEV_LOG_DEBUG(fmt, args...)					\
		RTE_LOG(DEBUG, CRYPTODEV, "%s() line %u: " fmt "\n",	\
				__func__, __LINE__, ## args)		\

#define CDEV_PMD_TRACE(fmt, args...)					\
		RTE_LOG(DEBUG, CRYPTODEV, "[%s] %s: " fmt "\n",		\
				dev, __func__, ## args)

#else
#define CDEV_LOG_DEBUG(fmt, args...)
#define CDEV_PMD_TRACE(fmt, args...)
#endif

/**  Crypto device information */
struct rte_cryptodev_info {
	const char *driver_name;		/**< Driver name. */
	enum rte_cryptodev_type dev_type;	/**< Device type */
	struct rte_pci_device *pci_dev;		/**< PCI information. */

	unsigned max_nb_queue_pairs;
	/**< Maximum number of queues pairs supported by device. */
	unsigned max_nb_sessions;
	/**< Maximum number of sessions supported by device. */
};

#define RTE_CRYPTODEV_DETACHED  (0)
#define RTE_CRYPTODEV_ATTACHED  (1)

/** Definitions of Crypto device event types */
enum rte_cryptodev_event_type {
	RTE_CRYPTODEV_EVENT_UNKNOWN,	/**< unknown event type */
	RTE_CRYPTODEV_EVENT_ERROR,	/**< error interrupt event */
	RTE_CRYPTODEV_EVENT_MAX		/**< max value of this enum */
};

/** Crypto device queue pair configuration structure. */
struct rte_cryptodev_qp_conf {
	uint32_t nb_descriptors; /**< Number of descriptors per queue pair */
};

/**
 * Typedef for application callback function to be registered by application
 * software for notification of device events
 *
 * @param	dev_id	Crypto device identifier
 * @param	event	Crypto device event to register for notification of.
 * @param	cb_arg	User specified parameter to be passed as to passed to
 *			users callback function.
 */
typedef void (*rte_cryptodev_cb_fn)(uint8_t dev_id,
		enum rte_cryptodev_event_type event, void *cb_arg);

#ifdef RTE_CRYPTODEV_PERF
/**
 * Crypto Device performance counter statistics structure. This structure is
 * used for RDTSC counters for measuring crypto operations.
 */
struct rte_cryptodev_perf_stats {
	uint64_t t_accumlated;	/**< Accumulated time processing operation */
	uint64_t t_min;		/**< Max time */
	uint64_t t_max;		/**< Min time */
};
#endif

/** Crypto Device statistics */
struct rte_cryptodev_stats {
	uint64_t enqueued_count;
	/**< Count of all operations enqueued */
	uint64_t dequeued_count;
	/**< Count of all operations dequeued */

	uint64_t enqueue_err_count;
	/**< Total error count on operations enqueued */
	uint64_t dequeue_err_count;
	/**< Total error count on operations dequeued */

#ifdef RTE_CRYPTODEV_DETAILED_STATS
	struct {
		uint64_t encrypt_ops;	/**< Count of encrypt operations */
		uint64_t encrypt_bytes;	/**< Number of bytes encrypted */

		uint64_t decrypt_ops;	/**< Count of decrypt operations */
		uint64_t decrypt_bytes;	/**< Number of bytes decrypted */
	} cipher; /**< Cipher operations stats */

	struct {
		uint64_t generate_ops;	/**< Count of generate operations */
		uint64_t bytes_hashed;	/**< Number of bytes hashed */

		uint64_t verify_ops;	/**< Count of verify operations */
		uint64_t bytes_verified;/**< Number of bytes verified */
	} hash;	 /**< Hash operations stats */
#endif

#ifdef RTE_CRYPTODEV_PERF
	struct rte_cryptodev_perf_stats op_perf; /**< Operations stats */
#endif
} __rte_cache_aligned;

/**
 * Create a virtual crypto device
 *
 * @param	name	Cryptodev PMD name of device to be created.
 * @param	args	Options arguments for device.
 *
 * @return
 * - On successful creation of the cryptodev the device index is returned,
 *   which will be between 0 and rte_cryptodev_count().
 * - In the case of a failure, returns -1.
 */
extern int
rte_cryptodev_create_vdev(const char *name, const char *args);

/**
 * Get the device identifier for the named crypto device.
 *
 * @param	name	device name to select the device structure.
 *
 * @return
 *   - Returns crypto device identifier on success.
 *   - Return -1 on failure to find named crypto device.
 */
extern int
rte_cryptodev_get_dev_id(const char *name);

/**
 * Get the total number of crypto devices that have been successfully
 * initialised.
 *
 * @return
 *   - The total number of usable crypto devices.
 */
extern uint8_t
rte_cryptodev_count(void);

extern uint8_t
rte_cryptodev_count_devtype(enum rte_cryptodev_type type);
/*
 * Return the NUMA socket to which a device is connected
 *
 * @param dev_id
 *   The identifier of the device
 * @return
 *   The NUMA socket id to which the device is connected or
 *   a default of zero if the socket could not be determined.
 *   -1 if returned is the dev_id value is out of range.
 */
extern int
rte_cryptodev_socket_id(uint8_t dev_id);

/** Crypto device configuration structure */
struct rte_cryptodev_config {
	int socket_id;			/**< Socket to allocate resources on */
	uint16_t nb_queue_pairs;
	/**< Number of queue pairs to configure on device */

	struct {
		uint32_t nb_objs;	/**< Number of objects in mempool */
		uint32_t cache_size;	/**< l-core object cache size */
	} session_mp;		/**< Session mempool configuration */
};

/**
 * Configure a device.
 *
 * EXPERIMENTAL: this API file may change without prior notice
 *
 * This function must be invoked first before any other function in the
 * API. This function can also be re-invoked when a device is in the
 * stopped state.
 *
 * @param	dev_id		The identifier of the device to configure.
 * @param	config		The crypto device configuration structure.
 *
 * @return
 *   - 0: Success, device configured.
 *   - <0: Error code returned by the driver configuration function.
 */
extern int
rte_cryptodev_configure(uint8_t dev_id, struct rte_cryptodev_config *config);

/**
 * Start an device.
 *
 * The device start step is the last one and consists of setting the configured
 * offload features and in starting the transmit and the receive units of the
 * device.
 * On success, all basic functions exported by the API (link status,
 * receive/transmit, and so on) can be invoked.
 *
 * @param dev_id
 *   The identifier of the device.
 * @return
 *   - 0: Success, device started.
 *   - <0: Error code of the driver device start function.
 */
extern int
rte_cryptodev_start(uint8_t dev_id);

/**
 * Stop an device. The device can be restarted with a call to
 * rte_cryptodev_start()
 *
 * @param	dev_id		The identifier of the device.
 */
extern void
rte_cryptodev_stop(uint8_t dev_id);

/**
 * Close an device. The device cannot be restarted!
 *
 * @param	dev_id		The identifier of the device.
 *
 * @return
 *  - 0 on successfully closing device
 *  - <0 on failure to close device
 */
extern int
rte_cryptodev_close(uint8_t dev_id);

/**
 * Allocate and set up a receive queue pair for a device.
 *
 *
 * @param	dev_id		The identifier of the device.
 * @param	queue_pair_id	The index of the queue pairs to set up. The
 *				value must be in the range [0, nb_queue_pair
 *				- 1] previously supplied to
 *				rte_cryptodev_configure().
 * @param	qp_conf		The pointer to the configuration data to be
 *				used for the queue pair. NULL value is
 *				allowed, in which case default configuration
 *				will be used.
 * @param	socket_id	The *socket_id* argument is the socket
 *				identifier in case of NUMA. The value can be
 *				*SOCKET_ID_ANY* if there is no NUMA constraint
 *				for the DMA memory allocated for the receive
 *				queue pair.
 *
 * @return
 *   - 0: Success, queue pair correctly set up.
 *   - <0: Queue pair configuration failed
 */
extern int
rte_cryptodev_queue_pair_setup(uint8_t dev_id, uint16_t queue_pair_id,
		const struct rte_cryptodev_qp_conf *qp_conf, int socket_id);

/**
 * Start a specified queue pair of a device. It is used
 * when deferred_start flag of the specified queue is true.
 *
 * @param	dev_id		The identifier of the device
 * @param	queue_pair_id	The index of the queue pair to start. The value
 *				must be in the range [0, nb_queue_pair - 1]
 *				previously supplied to
 *				rte_crypto_dev_configure().
 * @return
 *   - 0: Success, the transmit queue is correctly set up.
 *   - -EINVAL: The dev_id or the queue_id out of range.
 *   - -ENOTSUP: The function not supported in PMD driver.
 */
extern int
rte_cryptodev_queue_pair_start(uint8_t dev_id, uint16_t queue_pair_id);

/**
 * Stop specified queue pair of a device
 *
 * @param	dev_id		The identifier of the device
 * @param	queue_pair_id	The index of the queue pair to stop. The value
 *				must be in the range [0, nb_queue_pair - 1]
 *				previously supplied to
 *				rte_cryptodev_configure().
 * @return
 *   - 0: Success, the transmit queue is correctly set up.
 *   - -EINVAL: The dev_id or the queue_id out of range.
 *   - -ENOTSUP: The function not supported in PMD driver.
 */
extern int
rte_cryptodev_queue_pair_stop(uint8_t dev_id, uint16_t queue_pair_id);

/**
 * Get the number of queue pairs on a specific crypto device
 *
 * @param	dev_id		Crypto device identifier.
 * @return
 *   - The number of configured queue pairs.
 */
extern uint16_t
rte_cryptodev_queue_pair_count(uint8_t dev_id);


/**
 * Retrieve the general I/O statistics of a device.
 *
 * @param	dev_id		The identifier of the device.
 * @param	stats		A pointer to a structure of type
 *				*rte_cryptodev_stats* to be filled with the
 *				values of device counters.
 * @return
 *   - Zero if successful.
 *   - Non-zero otherwise.
 */
extern int
rte_cryptodev_stats_get(uint8_t dev_id, struct rte_cryptodev_stats *stats);

/**
 * Reset the general I/O statistics of a device.
 *
 * @param	dev_id		The identifier of the device.
 */
extern void
rte_cryptodev_stats_reset(uint8_t dev_id);

/**
 * Retrieve the contextual information of a device.
 *
 * @param	dev_id		The identifier of the device.
 * @param	dev_info	A pointer to a structure of type
 *				*rte_cryptodev_info* to be filled with the
 *				contextual information of the device.
 */
extern void
rte_cryptodev_info_get(uint8_t dev_id, struct rte_cryptodev_info *dev_info);


/**
 * Register a callback function for specific device id.
 *
 * @param	dev_id		Device id.
 * @param	event		Event interested.
 * @param	cb_fn		User supplied callback function to be called.
 * @param	cb_arg		Pointer to the parameters for the registered
 *				callback.
 *
 * @return
 *  - On success, zero.
 *  - On failure, a negative value.
 */
extern int
rte_cryptodev_callback_register(uint8_t dev_id,
		enum rte_cryptodev_event_type event,
		rte_cryptodev_cb_fn cb_fn, void *cb_arg);

/**
 * Unregister a callback function for specific device id.
 *
 * @param	dev_id		The device identifier.
 * @param	event		Event interested.
 * @param	cb_fn		User supplied callback function to be called.
 * @param	cb_arg		Pointer to the parameters for the registered
 *				callback.
 *
 * @return
 *  - On success, zero.
 *  - On failure, a negative value.
 */
extern int
rte_cryptodev_callback_unregister(uint8_t dev_id,
		enum rte_cryptodev_event_type event,
		rte_cryptodev_cb_fn cb_fn, void *cb_arg);


typedef uint16_t (*dequeue_pkt_burst_t)(void *qp, struct rte_mbuf **pkts,
		uint16_t nb_pkts);
/**< Dequeue processed packets from queue pair of a device. */

typedef uint16_t (*enqueue_pkt_burst_t)(void *qp, struct rte_mbuf **pkts,
		uint16_t nb_pkts);
/**< Enqueue packets for processing on queue pair of a device. */


struct rte_cryptodev_callback;

/** Structure to keep track of registered callbacks */
TAILQ_HEAD(rte_cryptodev_cb_list, rte_cryptodev_callback);

/** The data structure associated with each crypto device. */
struct rte_cryptodev {
	dequeue_pkt_burst_t dequeue_burst;
	/**< Pointer to PMD receive function. */
	enqueue_pkt_burst_t enqueue_burst;
	/**< Pointer to PMD transmit function. */

	const struct rte_cryptodev_driver *driver;
	/**< Driver for this device */
	struct rte_cryptodev_data *data;
	/**< Pointer to device data */
	struct rte_cryptodev_ops *dev_ops;
	/**< Functions exported by PMD */
	struct rte_pci_device *pci_dev;
	/**< PCI info. supplied by probing */

	enum rte_cryptodev_type dev_type;
	/**< Crypto device type */
	enum pmd_type pmd_type;
	/**< PMD type - PDEV / VDEV */

	struct rte_cryptodev_cb_list link_intr_cbs;
	/**< User application callback for interrupts if present */

	uint8_t attached : 1;
	/**< Flag indicating the device is attached */
} __rte_cache_aligned;


#define RTE_CRYPTODEV_NAME_MAX_LEN	(64)
/**< Max length of name of crypto PMD */

/**
 *
 * The data part, with no function pointers, associated with each device.
 *
 * This structure is safe to place in shared memory to be common among
 * different processes in a multi-process configuration.
 */
struct rte_cryptodev_data {
	uint8_t dev_id;
	/**< Device ID for this instance */
	uint8_t socket_id;
	/**< Socket ID where memory is allocated */
	char name[RTE_CRYPTODEV_NAME_MAX_LEN];
	/**< Unique identifier name */

	uint8_t dev_started : 1;
	/**< Device state: STARTED(1)/STOPPED(0) */

	struct rte_mempool *session_pool;
	/**< Session memory pool */
	void **queue_pairs;
	/**< Array of pointers to queue pairs. */
	uint16_t nb_queue_pairs;
	/**< Number of device queue pairs. */

	void *dev_private;
	/**< PMD-specific private data */
} __rte_cache_aligned;

extern struct rte_cryptodev *rte_cryptodevs;
/**
 *
 * Dequeue a burst of processed packets from a queue of the crypto device.
 * The dequeued packets are stored in *rte_mbuf* structures whose pointers are
 * supplied in the *pkts* array.
 *
 * The rte_crypto_dequeue_burst() function returns the number of packets
 * actually dequeued, which is the number of *rte_mbuf* data structures
 * effectively supplied into the *pkts* array.
 *
 * A return value equal to *nb_pkts* indicates that the queue contained
 * at least *rx_pkts* packets, and this is likely to signify that other
 * received packets remain in the input queue. Applications implementing
 * a "retrieve as much received packets as possible" policy can check this
 * specific case and keep invoking the rte_crypto_dequeue_burst() function
 * until a value less than *nb_pkts* is returned.
 *
 * The rte_crypto_dequeue_burst() function does not provide any error
 * notification to avoid the corresponding overhead.
 *
 * @param	dev_id		The identifier of the device.
 * @param	qp_id		The index of the queue pair from which to
 *				retrieve processed packets. The value must be
 *				in the range [0, nb_queue_pair - 1] previously
 *				supplied to rte_cryptodev_configure().
 * @param	pkts		The address of an array of pointers to
 *				*rte_mbuf* structures that must be large enough
 *				to store *nb_pkts* pointers in it.
 * @param	nb_pkts		The maximum number of packets to dequeue.
 *
 * @return
 *   - The number of packets actually dequeued, which is the number
 *   of pointers to *rte_mbuf* structures effectively supplied to the
 *   *pkts* array.
 */
static inline uint16_t
rte_cryptodev_dequeue_burst(uint8_t dev_id, uint16_t qp_id,
		struct rte_mbuf **pkts, uint16_t nb_pkts)
{
	struct rte_cryptodev *dev = &rte_cryptodevs[dev_id];

	nb_pkts = (*dev->dequeue_burst)
			(dev->data->queue_pairs[qp_id], pkts, nb_pkts);

	return nb_pkts;
}

/**
 * Enqueue a burst of packets for processing on a crypto device.
 *
 * The rte_crypto_enqueue_burst() function is invoked to place packets
 * on the queue *queue_id* of the device designated by its *dev_id*.
 *
 * The *nb_pkts* parameter is the number of packets to process which are
 * supplied in the *pkts* array of *rte_mbuf* structures.
 *
 * The rte_crypto_enqueue_burst() function returns the number of packets it
 * actually sent. A return value equal to *nb_pkts* means that all packets
 * have been sent.
 *
 * Each mbuf in the *pkts* array must have a valid *rte_mbuf_offload* structure
 * attached which contains a valid crypto operation.
 *
 * @param	dev_id		The identifier of the device.
 * @param	qp_id		The index of the queue pair which packets are
 *				to be enqueued for processing. The value
 *				must be in the range [0, nb_queue_pairs - 1]
 *				previously supplied to
 *				 *rte_cryptodev_configure*.
 * @param	pkts		The address of an array of *nb_pkts* pointers
 *				to *rte_mbuf* structures which contain the
 *				output packets.
 * @param	nb_pkts		The number of packets to transmit.
 *
 * @return
 * The number of packets actually enqueued on the crypto device. The return
 * value can be less than the value of the *nb_pkts* parameter when the
 * crypto devices queue is full or has been filled up.
 * The number of packets is 0 if the device hasn't been started.
 */
static inline uint16_t
rte_cryptodev_enqueue_burst(uint8_t dev_id, uint16_t qp_id,
		struct rte_mbuf **pkts, uint16_t nb_pkts)
{
	struct rte_cryptodev *dev = &rte_cryptodevs[dev_id];

	return (*dev->enqueue_burst)(
			dev->data->queue_pairs[qp_id], pkts, nb_pkts);
}


/**
 * Initialise a session for symmetric cryptographic operations.
 *
 * This function is used by the client to initialize immutable
 * parameters of symmetric cryptographic operation.
 * To perform the operation the rte_cryptodev_enqueue_burst function is
 * used.  Each mbuf should contain a reference to the session
 * pointer returned from this function contained within it's crypto_op if a
 * session-based operation is being provisioned. Memory to contain the session
 * information is allocated from within mempool managed by the cryptodev.
 *
 * The rte_cryptodev_session_free must be called to free allocated
 * memory when the session is no longer required.
 *
 * @param	dev_id		The device identifier.
 * @param	xform		Crypto transform chain.

 *
 * @return
 *  Pointer to the created session or NULL
 */
extern struct rte_cryptodev_session *
rte_cryptodev_session_create(uint8_t dev_id,
		struct rte_crypto_xform *xform);


/**
 * Free the memory associated with a previously allocated session.
 *
 * @param	dev_id		The device identifier.
 * @param	session		Session pointer previously allocated by
 *				*rte_cryptodev_session_create*.
 *
 * @return
 *   NULL on successful freeing of session.
 *   Session pointer on failure to free session.
 */
extern struct rte_cryptodev_session *
rte_cryptodev_session_free(uint8_t dev_id,
		struct rte_cryptodev_session *session);


#ifdef __cplusplus
}
#endif

#endif /* _RTE_CRYPTODEV_H_ */