/*-
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/** \file
 * Memory copy offload engine abstraction layer
 */

#ifndef SPDK_COPY_ENGINE_H
#define SPDK_COPY_ENGINE_H

#include "spdk/stdinc.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Copy operation callback.
 *
 * \param ref 'copy_req' passed to the corresponding spdk_copy_submit() call.
 * \param status 0 if it completed successfully, or negative errno if it failed.
 */
typedef void (*spdk_copy_completion_cb)(void *ref, int status);

/**
 * Copy engine finish callback.
 *
 * \param cb_arg Callback argument.
 */
typedef void (*spdk_copy_fini_cb)(void *cb_arg);

struct spdk_io_channel;

struct spdk_copy_task;

/**
 * Initialize the copy engine.
 *
 * \return 0 on success.
 */
int spdk_copy_engine_initialize(void);

/**
 * Close the copy engine.
 *
 * \param cb_fn Called when the close operation completes.
 * \param cb_arg Argument passed to the callback function.
 */
void spdk_copy_engine_finish(spdk_copy_fini_cb cb_fn, void *cb_arg);

/**
 * Get the configuration for the copy engine.
 *
 * \param fp The pointer to a file that will be written to the configuration.
 */
void spdk_copy_engine_config_text(FILE *fp);

/**
 * Close the copy engine module and perform any necessary cleanup.
 */
void spdk_copy_engine_module_finish(void);

/**
 * Get the I/O channel registered on the copy engine.
 *
 * This I/O channel is used to submit copy request.
 *
 * \return a pointer to the I/O channel on success, or NULL on failure.
 */
struct spdk_io_channel *spdk_copy_engine_get_io_channel(void);

/**
 * Submit a copy request.
 *
 * \param copy_req Copy request task.
 * \param ch I/O channel to submit request to the copy engine. This channel can
 * be obtained by the function spdk_copy_engine_get_io_channel().
 * \param dst Destination to copy to.
 * \param src Source to copy from.
 * \param nbytes Length in bytes to copy.
 * \param cb Called when this copy operation completes.
 *
 * \return 0 on success, negative errno on failure.
 */
int spdk_copy_submit(struct spdk_copy_task *copy_req, struct spdk_io_channel *ch, void *dst,
		     void *src, uint64_t nbytes, spdk_copy_completion_cb cb);

/**
 * Submit a fill request.
 *
 * This operation will fill the destination buffer with the specified value.
 *
 * \param copy_req Copy request task.
 * \param ch I/O channel to submit request to the copy engine. This channel can
 * be obtained by the function spdk_copy_engine_get_io_channel().
 * \param dst Destination to fill.
 * \param fill Constant byte to fill to the destination.
 * \param nbytes Length in bytes to fill.
 * \param cb Called when this copy operation completes.
 *
 * \return 0 on success, negative errno on failure.
 */
int spdk_copy_submit_fill(struct spdk_copy_task *copy_req, struct spdk_io_channel *ch,
			  void *dst, uint8_t fill, uint64_t nbytes, spdk_copy_completion_cb cb);

/**
 * Get the size of copy task.
 *
 * \return the size of copy task.
 */
size_t spdk_copy_task_size(void);

#ifdef __cplusplus
}
#endif

#endif