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lib: Introduce priority array area manager

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This introduces a infrastructure for management of linear priority
areas. Priority order in an array matters, however order of items inside
a priority group does not matter.

As an initial implementation, L-sort algorithm is used. It is quite
trivial. More advanced algorithm called P-sort will be introduced as a
follow-up. The infrastructure is prepared for other algos.

Alongside this, a testing module is introduced as well.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
2017-02-03 10:29:06 +01:00
committed by David S. Miller
parent b862815c3e
commit 44091d29f2
7 changed files with 871 additions and 0 deletions
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76
include/linux/parman.h Normal file
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/*
* include/linux/parman.h - Manager for linear priority array areas
* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
* Copyright (c) 2017 Jiri Pirko <jiri@mellanox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* 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 _PARMAN_H
#define _PARMAN_H
#include <linux/list.h>
enum parman_algo_type {
PARMAN_ALGO_TYPE_LSORT,
};
struct parman_item {
struct list_head list;
unsigned long index;
};
struct parman_prio {
struct list_head list;
struct list_head item_list;
unsigned long priority;
};
struct parman_ops {
unsigned long base_count;
unsigned long resize_step;
int (*resize)(void *priv, unsigned long new_count);
void (*move)(void *priv, unsigned long from_index,
unsigned long to_index, unsigned long count);
enum parman_algo_type algo;
};
struct parman;
struct parman *parman_create(const struct parman_ops *ops, void *priv);
void parman_destroy(struct parman *parman);
void parman_prio_init(struct parman *parman, struct parman_prio *prio,
unsigned long priority);
void parman_prio_fini(struct parman_prio *prio);
int parman_item_add(struct parman *parman, struct parman_prio *prio,
struct parman_item *item);
void parman_item_remove(struct parman *parman, struct parman_prio *prio,
struct parman_item *item);
#endif