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/*
* drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
* Copyright (c) 2016 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/bitops.h>
#include "spectrum.h"
#define MLXSW_SP_KVDL_SINGLE_BASE 0
#define MLXSW_SP_KVDL_SINGLE_SIZE 16384
#define MLXSW_SP_KVDL_CHUNKS_BASE \
(MLXSW_SP_KVDL_SINGLE_BASE + MLXSW_SP_KVDL_SINGLE_SIZE)
#define MLXSW_SP_KVDL_CHUNKS_SIZE \
(MLXSW_SP_KVD_LINEAR_SIZE - MLXSW_SP_KVDL_CHUNKS_BASE)
#define MLXSW_SP_CHUNK_MAX 32
int mlxsw_sp_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, unsigned int entry_count)
{
int entry_index;
int size;
int type_base;
int type_size;
int type_entries;
if (entry_count == 0 || entry_count > MLXSW_SP_CHUNK_MAX) {
return -EINVAL;
} else if (entry_count == 1) {
type_base = MLXSW_SP_KVDL_SINGLE_BASE;
type_size = MLXSW_SP_KVDL_SINGLE_SIZE;
type_entries = 1;
} else {
type_base = MLXSW_SP_KVDL_CHUNKS_BASE;
type_size = MLXSW_SP_KVDL_CHUNKS_SIZE;
type_entries = MLXSW_SP_CHUNK_MAX;
}
entry_index = type_base;
size = type_base + type_size;
for_each_clear_bit_from(entry_index, mlxsw_sp->kvdl.usage, size) {
int i;
for (i = 0; i < type_entries; i++)
set_bit(entry_index + i, mlxsw_sp->kvdl.usage);
return entry_index;
}
return -ENOBUFS;
}
void mlxsw_sp_kvdl_free(struct mlxsw_sp *mlxsw_sp, int entry_index)
{
int type_entries;
int i;
if (entry_index < MLXSW_SP_KVDL_CHUNKS_BASE)
type_entries = 1;
else
type_entries = MLXSW_SP_CHUNK_MAX;
for (i = 0; i < type_entries; i++)
clear_bit(entry_index + i, mlxsw_sp->kvdl.usage);
}
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