LXR linux/drivers/net/ethernet/mellanox/mlxsw/spectrum

   1/*
   2 * drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
   3 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
   4 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
   5 *
   6 * Redistribution and use in source and binary forms, with or without
   7 * modification, are permitted provided that the following conditions are met:
   8 *
   9 * 1. Redistributions of source code must retain the above copyright
  10 *    notice, this list of conditions and the following disclaimer.
  11 * 2. Redistributions in binary form must reproduce the above copyright
  12 *    notice, this list of conditions and the following disclaimer in the
  13 *    documentation and/or other materials provided with the distribution.
  14 * 3. Neither the names of the copyright holders nor the names of its
  15 *    contributors may be used to endorse or promote products derived from
  16 *    this software without specific prior written permission.
  17 *
  18 * Alternatively, this software may be distributed under the terms of the
  19 * GNU General Public License ("GPL") version 2 as published by the Free
  20 * Software Foundation.
  21 *
  22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32 * POSSIBILITY OF SUCH DAMAGE.
  33 */
  34
  35#include <linux/kernel.h>
  36#include <linux/bitops.h>
  37
  38#include "spectrum.h"
  39
  40#define MLXSW_SP_KVDL_SINGLE_BASE 0
  41#define MLXSW_SP_KVDL_SINGLE_SIZE 16384
  42#define MLXSW_SP_KVDL_CHUNKS_BASE \
  43        (MLXSW_SP_KVDL_SINGLE_BASE + MLXSW_SP_KVDL_SINGLE_SIZE)
  44#define MLXSW_SP_KVDL_CHUNKS_SIZE \
  45        (MLXSW_SP_KVD_LINEAR_SIZE - MLXSW_SP_KVDL_CHUNKS_BASE)
  46#define MLXSW_SP_CHUNK_MAX 32
  47
  48int mlxsw_sp_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, unsigned int entry_count)
  49{
  50        int entry_index;
  51        int size;
  52        int type_base;
  53        int type_size;
  54        int type_entries;
  55
  56        if (entry_count == 0 || entry_count > MLXSW_SP_CHUNK_MAX) {
  57                return -EINVAL;
  58        } else if (entry_count == 1) {
  59                type_base = MLXSW_SP_KVDL_SINGLE_BASE;
  60                type_size = MLXSW_SP_KVDL_SINGLE_SIZE;
  61                type_entries = 1;
  62        } else {
  63                type_base = MLXSW_SP_KVDL_CHUNKS_BASE;
  64                type_size = MLXSW_SP_KVDL_CHUNKS_SIZE;
  65                type_entries = MLXSW_SP_CHUNK_MAX;
  66        }
  67
  68        entry_index = type_base;
  69        size = type_base + type_size;
  70        for_each_clear_bit_from(entry_index, mlxsw_sp->kvdl.usage, size) {
  71                int i;
  72
  73                for (i = 0; i < type_entries; i++)
  74                        set_bit(entry_index + i, mlxsw_sp->kvdl.usage);
  75                return entry_index;
  76        }
  77        return -ENOBUFS;
  78}
  79
  80void mlxsw_sp_kvdl_free(struct mlxsw_sp *mlxsw_sp, int entry_index)
  81{
  82        int type_entries;
  83        int i;
  84
  85        if (entry_index < MLXSW_SP_KVDL_CHUNKS_BASE)
  86                type_entries = 1;
  87        else
  88                type_entries = MLXSW_SP_CHUNK_MAX;
  89        for (i = 0; i < type_entries; i++)
  90                clear_bit(entry_index + i, mlxsw_sp->kvdl.usage);
  91}
  92