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44091d29f2
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>
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/*
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* include/linux/parman.h - Manager for linear priority array areas
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* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2017 Jiri Pirko <jiri@mellanox.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _PARMAN_H
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#define _PARMAN_H
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#include <linux/list.h>
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enum parman_algo_type {
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PARMAN_ALGO_TYPE_LSORT,
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};
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struct parman_item {
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struct list_head list;
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unsigned long index;
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};
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struct parman_prio {
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struct list_head list;
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struct list_head item_list;
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unsigned long priority;
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};
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struct parman_ops {
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unsigned long base_count;
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unsigned long resize_step;
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int (*resize)(void *priv, unsigned long new_count);
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void (*move)(void *priv, unsigned long from_index,
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unsigned long to_index, unsigned long count);
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enum parman_algo_type algo;
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};
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struct parman;
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struct parman *parman_create(const struct parman_ops *ops, void *priv);
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void parman_destroy(struct parman *parman);
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void parman_prio_init(struct parman *parman, struct parman_prio *prio,
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unsigned long priority);
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void parman_prio_fini(struct parman_prio *prio);
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int parman_item_add(struct parman *parman, struct parman_prio *prio,
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struct parman_item *item);
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void parman_item_remove(struct parman *parman, struct parman_prio *prio,
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struct parman_item *item);
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#endif
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