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/*-
* BSD LICENSE
*
* Copyright (c) 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 SPDK_VBDEV_DELAY_H
#define SPDK_VBDEV_DELAY_H
#include "spdk/stdinc.h"
#include "spdk/bdev.h"
#include "spdk/bdev_module.h"
enum delay_io_type {
DELAY_AVG_READ,
DELAY_P99_READ,
DELAY_AVG_WRITE,
DELAY_P99_WRITE,
DELAY_NONE
};
/**
* Create new delay bdev.
*
* \param bdev_name Bdev on which delay vbdev will be created.
* \param vbdev_name Name of the delay bdev.
* \param avg_read_latency Desired typical read latency.
* \param p99_read_latency Desired p99 read latency
* \param avg_write_latency Desired typical write latency.
* \param p99_write_latency Desired p99 write latency
* \return 0 on success, other on failure.
*/
int create_delay_disk(const char *bdev_name, const char *vbdev_name, uint64_t avg_read_latency,
uint64_t p99_read_latency, uint64_t avg_write_latency, uint64_t p99_write_latency);
/**
* Delete delay bdev.
*
* \param bdev Pointer to delay bdev.
* \param cb_fn Function to call after deletion.
* \param cb_arg Argument to pass to cb_fn.
*/
void delete_delay_disk(struct spdk_bdev *bdev, spdk_bdev_unregister_cb cb_fn,
void *cb_arg);
/**
* Update one of the latency values for a given delay bdev.
*
* \param delay_name The name of the delay bdev
* \param latency_us The new latency value, in microseconds
* \param type a valid value from the delay_io_type enum
* \return 0 on success, -ENODEV if the bdev cannot be found, and -EINVAL if the bdev is not a delay device.
*/
int vbdev_delay_update_latency_value(char *delay_name, uint64_t latency_us,
enum delay_io_type type);
#endif /* SPDK_VBDEV_DELAY_H */
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