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