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|
/*
* drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c
* 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.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/errno.h>
#include "item.h"
#include "core_acl_flex_keys.h"
struct mlxsw_afk {
struct list_head key_info_list;
unsigned int max_blocks;
const struct mlxsw_afk_block *blocks;
unsigned int blocks_count;
};
static bool mlxsw_afk_blocks_check(struct mlxsw_afk *mlxsw_afk)
{
int i;
int j;
for (i = 0; i < mlxsw_afk->blocks_count; i++) {
const struct mlxsw_afk_block *block = &mlxsw_afk->blocks[i];
for (j = 0; j < block->instances_count; j++) {
struct mlxsw_afk_element_inst *elinst;
elinst = &block->instances[j];
if (elinst->type != elinst->info->type ||
elinst->item.size.bits !=
elinst->info->item.size.bits)
return false;
}
}
return true;
}
struct mlxsw_afk *mlxsw_afk_create(unsigned int max_blocks,
const struct mlxsw_afk_block *blocks,
unsigned int blocks_count)
{
struct mlxsw_afk *mlxsw_afk;
mlxsw_afk = kzalloc(sizeof(*mlxsw_afk), GFP_KERNEL);
if (!mlxsw_afk)
return NULL;
INIT_LIST_HEAD(&mlxsw_afk->key_info_list);
mlxsw_afk->max_blocks = max_blocks;
mlxsw_afk->blocks = blocks;
mlxsw_afk->blocks_count = blocks_count;
WARN_ON(!mlxsw_afk_blocks_check(mlxsw_afk));
return mlxsw_afk;
}
EXPORT_SYMBOL(mlxsw_afk_create);
void mlxsw_afk_destroy(struct mlxsw_afk *mlxsw_afk)
{
WARN_ON(!list_empty(&mlxsw_afk->key_info_list));
kfree(mlxsw_afk);
}
EXPORT_SYMBOL(mlxsw_afk_destroy);
struct mlxsw_afk_key_info {
struct list_head list;
unsigned int ref_count;
unsigned int blocks_count;
int element_to_block[MLXSW_AFK_ELEMENT_MAX]; /* index is element, value
* is index inside "blocks"
*/
struct mlxsw_afk_element_usage elusage;
const struct mlxsw_afk_block *blocks[0];
};
static bool
mlxsw_afk_key_info_elements_eq(struct mlxsw_afk_key_info *key_info,
struct mlxsw_afk_element_usage *elusage)
{
return memcmp(&key_info->elusage, elusage, sizeof(*elusage)) == 0;
}
static struct mlxsw_afk_key_info *
mlxsw_afk_key_info_find(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_element_usage *elusage)
{
struct mlxsw_afk_key_info *key_info;
list_for_each_entry(key_info, &mlxsw_afk->key_info_list, list) {
if (mlxsw_afk_key_info_elements_eq(key_info, elusage))
return key_info;
}
return NULL;
}
struct mlxsw_afk_picker {
struct {
DECLARE_BITMAP(element, MLXSW_AFK_ELEMENT_MAX);
unsigned int total;
} hits[0];
};
static void mlxsw_afk_picker_count_hits(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_picker *picker,
enum mlxsw_afk_element element)
{
int i;
int j;
for (i = 0; i < mlxsw_afk->blocks_count; i++) {
const struct mlxsw_afk_block *block = &mlxsw_afk->blocks[i];
for (j = 0; j < block->instances_count; j++) {
struct mlxsw_afk_element_inst *elinst;
elinst = &block->instances[j];
if (elinst->info->element == element) {
__set_bit(element, picker->hits[i].element);
picker->hits[i].total++;
}
}
}
}
static void mlxsw_afk_picker_subtract_hits(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_picker *picker,
int block_index)
{
DECLARE_BITMAP(hits_element, MLXSW_AFK_ELEMENT_MAX);
int i;
int j;
memcpy(&hits_element, &picker->hits[block_index].element,
sizeof(hits_element));
for (i = 0; i < mlxsw_afk->blocks_count; i++) {
for_each_set_bit(j, hits_element, MLXSW_AFK_ELEMENT_MAX) {
if (__test_and_clear_bit(j, picker->hits[i].element))
picker->hits[i].total--;
}
}
}
static int mlxsw_afk_picker_most_hits_get(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_picker *picker)
{
int most_index = -EINVAL; /* Should never happen to return this */
int most_hits = 0;
int i;
for (i = 0; i < mlxsw_afk->blocks_count; i++) {
if (picker->hits[i].total > most_hits) {
most_hits = picker->hits[i].total;
most_index = i;
}
}
return most_index;
}
static int mlxsw_afk_picker_key_info_add(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_picker *picker,
int block_index,
struct mlxsw_afk_key_info *key_info)
{
enum mlxsw_afk_element element;
if (key_info->blocks_count == mlxsw_afk->max_blocks)
return -EINVAL;
for_each_set_bit(element, picker->hits[block_index].element,
MLXSW_AFK_ELEMENT_MAX) {
key_info->element_to_block[element] = key_info->blocks_count;
mlxsw_afk_element_usage_add(&key_info->elusage, element);
}
key_info->blocks[key_info->blocks_count] =
&mlxsw_afk->blocks[block_index];
key_info->blocks_count++;
return 0;
}
static int mlxsw_afk_picker(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_key_info *key_info,
struct mlxsw_afk_element_usage *elusage)
{
struct mlxsw_afk_picker *picker;
enum mlxsw_afk_element element;
size_t alloc_size;
int err;
alloc_size = sizeof(picker->hits[0]) * mlxsw_afk->blocks_count;
picker = kzalloc(alloc_size, GFP_KERNEL);
if (!picker)
return -ENOMEM;
/* Since the same elements could be present in multiple blocks,
* we must find out optimal block list in order to make the
* block count as low as possible.
*
* First, we count hits. We go over all available blocks and count
* how many of requested elements are covered by each.
*
* Then in loop, we find block with most hits and add it to
* output key_info. Then we have to subtract this block hits so
* the next iteration will find most suitable block for
* the rest of requested elements.
*/
mlxsw_afk_element_usage_for_each(element, elusage)
mlxsw_afk_picker_count_hits(mlxsw_afk, picker, element);
do {
int block_index;
block_index = mlxsw_afk_picker_most_hits_get(mlxsw_afk, picker);
if (block_index < 0) {
err = block_index;
goto out;
}
err = mlxsw_afk_picker_key_info_add(mlxsw_afk, picker,
block_index, key_info);
if (err)
goto out;
mlxsw_afk_picker_subtract_hits
|