/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2017-2018 Intel Corporation
 */

#ifndef _RTE_COMPRESSDEV_PMD_H_
#define _RTE_COMPRESSDEV_PMD_H_

/** @file
 * RTE comp PMD APIs
 *
 * @note
 * These APIs are for comp PMDs only and user applications should not call
 * them directly.
 */

#include <string.h>

#include <dev_driver.h>

#include "rte_compressdev.h"
#include "rte_compressdev_internal.h"

#ifdef __cplusplus
extern "C" {
#endif

#define RTE_COMPRESSDEV_PMD_NAME_ARG			("name")
#define RTE_COMPRESSDEV_PMD_SOCKET_ID_ARG		("socket_id")

static const char * const compressdev_pmd_valid_params[] = {
	RTE_COMPRESSDEV_PMD_NAME_ARG,
	RTE_COMPRESSDEV_PMD_SOCKET_ID_ARG
};

/**
 * @internal
 * Initialisation parameters for comp devices
 */
struct rte_compressdev_pmd_init_params {
	char name[RTE_COMPRESSDEV_NAME_MAX_LEN];
	int socket_id;
};

/** Global structure used for maintaining state of allocated comp devices */
struct rte_compressdev_global {
	struct rte_compressdev *devs;	/**< Device information array */
	struct rte_compressdev_data *data[RTE_COMPRESS_MAX_DEVS];
	/**< Device private data */
	uint8_t nb_devs;		/**< Number of devices found */
	uint8_t max_devs;		/**< Max number of devices */
};

/**
 * Get the rte_compressdev structure device pointer for the named device.
 *
 * @param name
 *   Compress device name
 * @return
 *   - The rte_compressdev structure pointer for the given device identifier.
 */
struct rte_compressdev *
rte_compressdev_pmd_get_named_dev(const char *name);

/**
 * Definitions of all functions exported by a driver through
 * the generic structure of type *comp_dev_ops* supplied in the
 * *rte_compressdev* structure associated with a device.
 */

/**
 * Function used to configure device.
 *
 * @param dev
 *   Compress device
 * @param config
 *   Compress device configurations
 * @return
 *   Returns 0 on success
 */
typedef int (*compressdev_configure_t)(struct rte_compressdev *dev,
		struct rte_compressdev_config *config);

/**
 * Function used to start a configured device.
 *
 * @param dev
 *   Compress device
 * @return
 *   Returns 0 on success
 */
typedef int (*compressdev_start_t)(struct rte_compressdev *dev);

/**
 * Function used to stop a configured device.
 *
 * @param dev
 *   Compress device
 */
typedef void (*compressdev_stop_t)(struct rte_compressdev *dev);

/**
 * Function used to close a configured device.
 *
 * @param dev
 *   Compress device
 * @return
 * - 0 on success.
 * - EAGAIN if can't close as device is busy
 */
typedef int (*compressdev_close_t)(struct rte_compressdev *dev);


/**
 * Function used to get statistics of a device.
 *
 * @param dev
 *   Compress device
 * @param stats
 *   Compress device stats to populate
 */
typedef void (*compressdev_stats_get_t)(struct rte_compressdev *dev,
				struct rte_compressdev_stats *stats);


/**
 * Function used to reset statistics of a device.
 *
 * @param dev
 *   Compress device
 */
typedef void (*compressdev_stats_reset_t)(struct rte_compressdev *dev);


/**
 * Function used to get specific information of a device.
 *
 * @param dev
 *   Compress device
 * @param dev_info
 *   Compress device information to populate
 */
typedef void (*compressdev_info_get_t)(struct rte_compressdev *dev,
				struct rte_compressdev_info *dev_info);

/**
 * Setup a queue pair for a device.
 *
 * @param dev
 *   Compress device
 * @param qp_id
 *   Queue pair identifier
 * @param max_inflight_ops
 *   Max inflight ops which qp must accommodate
 * @param socket_id
 *   Socket identifier
 * @return
 *   Returns 0 on success.
 */
typedef int (*compressdev_queue_pair_setup_t)(struct rte_compressdev *dev,
		uint16_t qp_id,	uint32_t max_inflight_ops, int socket_id);

/**
 * Release memory resources allocated by given queue pair.
 *
 * @param dev
 *   Compress device
 * @param qp_id
 *   Queue pair identifier
 * @return
 * - 0 on success.
 * - EAGAIN if can't close as device is busy
 */
typedef int (*compressdev_queue_pair_release_t)(struct rte_compressdev *dev,
		uint16_t qp_id);

/**
 * Create driver private stream data.
 *
 * @param dev
 *   Compressdev device
 * @param xform
 *   xform data
 * @param stream
 *   ptr where handle of pmd's private stream data should be stored
 * @return
 *  - Returns 0 if private stream structure has been created successfully.
 *  - Returns -EINVAL if input parameters are invalid.
 *  - Returns -ENOTSUP if comp device does not support STATEFUL operations.
 *  - Returns -ENOTSUP if comp device does not support the comp transform.
 *  - Returns -ENOMEM if the private stream could not be allocated.
 */
typedef int (*compressdev_stream_create_t)(struct rte_compressdev *dev,
		const struct rte_comp_xform *xform, void **stream);

/**
 * Free driver private stream data.
 *
 * @param dev
 *   Compressdev device
 * @param stream
 *   handle of pmd's private stream data
 * @return
 *  - 0 if successful
 *  - <0 in error cases
 *  - Returns -EINVAL if input parameters are invalid.
 *  - Returns -ENOTSUP if comp device does not support STATEFUL operations.
 *  - Returns -EBUSY if can't free stream as there are inflight operations
 */
typedef int (*compressdev_stream_free_t)(struct rte_compressdev *dev,
		void *stream);

/**
 * Create driver private_xform data.
 *
 * @param dev
 *   Compressdev device
 * @param xform
 *   xform data
 * @param private_xform
 *   ptr where handle of pmd's private_xform data should be stored
 * @return
 *  - if successful returns 0
 *    and valid private_xform handle
 *  - <0 in error cases
 *  - Returns -EINVAL if input parameters are invalid.
 *  - Returns -ENOTSUP if comp device does not support the comp transform.
 *  - Returns -ENOMEM if the private_xform could not be allocated.
 */
typedef int (*compressdev_private_xform_create_t)(struct rte_compressdev *dev,
		const struct rte_comp_xform *xform, void **private_xform);

/**
 * Free driver private_xform data.
 *
 * @param dev
 *   Compressdev device
 * @param private_xform
 *   handle of pmd's private_xform data
 * @return
 *  - 0 if successful
 *  - <0 in error cases
 *  - Returns -EINVAL if input parameters are invalid.
 *  - Returns -EBUSY if can't free private_xform due to inflight operations
 */
typedef int (*compressdev_private_xform_free_t)(struct rte_compressdev *dev,
		void *private_xform);

/** comp device operations function pointer table */
struct rte_compressdev_ops {
	compressdev_configure_t dev_configure;	/**< Configure device. */
	compressdev_start_t dev_start;		/**< Start device. */
	compressdev_stop_t dev_stop;		/**< Stop device. */
	compressdev_close_t dev_close;		/**< Close device. */

	compressdev_info_get_t dev_infos_get;	/**< Get device info. */

	compressdev_stats_get_t stats_get;
	/**< Get device statistics. */
	compressdev_stats_reset_t stats_reset;
	/**< Reset device statistics. */

	compressdev_queue_pair_setup_t queue_pair_setup;
	/**< Set up a device queue pair. */
	compressdev_queue_pair_release_t queue_pair_release;
	/**< Release a queue pair. */

	compressdev_stream_create_t stream_create;
	/**< Create a comp stream and initialise its private data. */
	compressdev_stream_free_t stream_free;
	/**< Free a comp stream's private data. */

	compressdev_private_xform_create_t private_xform_create;
	/**< Create a comp private_xform and initialise its private data. */
	compressdev_private_xform_free_t private_xform_free;
	/**< Free a comp private_xform's data. */
};

/**
 * @internal
 *
 * Function for internal use by dummy drivers primarily, e.g. ring-based
 * driver.
 * Allocates a new compressdev slot for an comp device and returns the pointer
 * to that slot for the driver to use.
 *
 * @param name
 *   Unique identifier name for each device
 * @param socket_id
 *   Socket to allocate resources on
 * @return
 *   - Slot in the rte_dev_devices array for a new device;
 */
struct rte_compressdev *
rte_compressdev_pmd_allocate(const char *name, int socket_id);

/**
 * @internal
 *
 * Function for internal use by dummy drivers primarily, e.g. ring-based
 * driver.
 * Release the specified compressdev device.
 *
 * @param dev
 *   Compress device
 * @return
 *   - 0 on success, negative on error
 */
int
rte_compressdev_pmd_release_device(struct rte_compressdev *dev);


/**
 * @internal
 *
 * PMD assist function to parse initialisation arguments for comp driver
 * when creating a new comp PMD device instance.
 *
 * PMD should set default values for that PMD before calling function,
 * these default values will be over-written with successfully parsed values
 * from args string.
 *
 * @param params
 *   Parsed PMD initialisation parameters
 * @param args
 *   Input argument string to parse
 * @return
 *  - 0 on success
 *  - errno on failure
 */
int
rte_compressdev_pmd_parse_input_args(
		struct rte_compressdev_pmd_init_params *params,
		const char *args);

/**
 * @internal
 *
 * PMD assist function to provide boiler plate code for comp driver to create
 * and allocate resources for a new comp PMD device instance.
 *
 * @param name
 *   Compress device name
 * @param device
 *   Base device instance
 * @param params
 *   PMD initialisation parameters
 * @return
 *  - comp device instance on success
 *  - NULL on creation failure
 */
struct rte_compressdev *
rte_compressdev_pmd_create(const char *name,
		struct rte_device *device,
		size_t private_data_size,
		struct rte_compressdev_pmd_init_params *params);

/**
 * @internal
 *
 * PMD assist function to provide boiler plate code for comp driver to
 * destroy and free resources associated with a comp PMD device instance.
 *
 * @param dev
 *   Compress device
 * @return
 *  - 0 on success
 *  - errno on failure
 */
int
rte_compressdev_pmd_destroy(struct rte_compressdev *dev);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_COMPRESSDEV_PMD_H_ */