92 lines
3.2 KiB
C
92 lines
3.2 KiB
C
/*
|
|
* 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);
|
|
}
|