Spdk/include/spdk/accel_engine.h

/*-
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 *
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/** \file
 * Acceleration engine abstraction layer
 */

#ifndef SPDK_ACCEL_ENGINE_H
#define SPDK_ACCEL_ENGINE_H

#include "spdk/stdinc.h"

#ifdef __cplusplus
extern "C" {
#endif

enum accel_capability {
	ACCEL_COPY		= 1 << 0,
	ACCEL_FILL		= 1 << 1,
	ACCEL_DUALCAST		= 1 << 2,
	ACCEL_COMPARE		= 1 << 3,
	ACCEL_BATCH		= 1 << 4,
	ACCEL_CRC32C		= 1 << 5,
	ACCEL_DIF		= 1 << 6,
};

/**
 * Acceleration operation callback.
 *
 * \param ref 'accel_req' passed to the corresponding spdk_accel_submit* call.
 * \param status 0 if it completed successfully, or negative errno if it failed.
 */
typedef void (*spdk_accel_completion_cb)(void *ref, int status);

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

struct spdk_io_channel;

struct spdk_accel_task;

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

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

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

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

/**
 * Get the I/O channel registered on the acceleration 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_accel_engine_get_io_channel(void);

/**
 * Retrieve accel engine capabilities.
 *
 * \param ch I/O channel to submit request to the accel engine. This channel can
 * be obtained by the function spdk_accel_engine_get_io_channel().
 *
 * \return bitmap of capabilities defined by enum accel_capability.
 */
uint64_t spdk_accel_get_capabilities(struct spdk_io_channel *ch);

/**
 * Submit a copy request.
 *
 * \param accel_req Accel request task.
 * \param ch I/O channel to submit request to the accel engine. This channel can
 * be obtained by the function spdk_accel_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_accel_submit_copy(struct spdk_accel_task *accel_req, struct spdk_io_channel *ch, void *dst,
			   void *src, uint64_t nbytes, spdk_accel_completion_cb cb);

/**
 * Submit a fill request.
 *
 * This operation will fill the destination buffer with the specified value.
 *
 * \param accel_req Accel request task.
 * \param ch I/O channel to submit request to the accel engine. This channel can
 * be obtained by the function spdk_accel_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 fill operation completes.
 *
 * \return 0 on success, negative errno on failure.
 */
int spdk_accel_submit_fill(struct spdk_accel_task *accel_req, struct spdk_io_channel *ch,
			   void *dst, uint8_t fill, uint64_t nbytes, spdk_accel_completion_cb cb);

/**
 * Submit a CRC-32C calculation request.
 *
 * This operation will calculate the 4 byte CRC32-C for the given data.
 *
 * \param accel_req Accel request task.
 * \param ch I/O channel to submit request to the accel engine. This channel can
 * be obtained by the function spdk_accel_engine_get_io_channel().
 * \param dst Destination to write the CRC-32C to.
 * \param src The source address for the data.
 * \param seed Four byte seed value.
 * \param nbytes Length in bytes.
 * \param cb Called when this CRC-32C operation completes.
 *
 * \return 0 on success, negative errno on failure.
 */
int spdk_accel_submit_crc32c(struct spdk_accel_task *accel_req, struct spdk_io_channel *ch,
			     uint32_t *dst, void *src, uint32_t seed, uint64_t nbytes, spdk_accel_completion_cb cb);

/**
 * Get the size of an acceleration task.
 *
 * \return the size of acceleration task.
 */
size_t spdk_accel_task_size(void);

struct spdk_json_write_ctx;

/**
 * Write Acceleration subsystem configuration into provided JSON context.
 *
 * \param w JSON write context
 */
void spdk_accel_write_config_json(struct spdk_json_write_ctx *w);

#ifdef __cplusplus
}
#endif

#endif