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                        u32 *p_entry_index)
  50{
  51        int entry_index;
  52        int size;
  53        int type_base;
  54        int type_size;
  55        int type_entries;
  56
  57        if (entry_count == 0 || entry_count > MLXSW_SP_CHUNK_MAX) {
  58                return -EINVAL;
  59        } else if (entry_count == 1) {
  60                type_base = MLXSW_SP_KVDL_SINGLE_BASE;
  61                type_size = MLXSW_SP_KVDL_SINGLE_SIZE;
  62                type_entries = 1;
  63        } else {
  64                type_base = MLXSW_SP_KVDL_CHUNKS_BASE;
  65                type_size = MLXSW_SP_KVDL_CHUNKS_SIZE;
  66                type_entries = MLXSW_SP_CHUNK_MAX;
  67        }
  68
  69        entry_index = type_base;
  70        size = type_base + type_size;
  71        for_each_clear_bit_from(entry_index, mlxsw_sp->kvdl.usage, size) {
  72                int i;
  73
  74                for (i = 0; i < type_entries; i++)
  75                        set_bit(entry_index + i, mlxsw_sp->kvdl.usage);
  76                *p_entry_index = entry_index;
  77                return 0;
  78        }
  79        return -ENOBUFS;
  80}
  81
  82void mlxsw_sp_kvdl_free(struct mlxsw_sp *mlxsw_sp, int entry_index)
  83{
  84        int type_entries;
  85        int i;
  86
  87        if (entry_index < MLXSW_SP_KVDL_CHUNKS_BASE)
  88                type_entries = 1;
  89        else
  90                type_entries = MLXSW_SP_CHUNK_MAX;
  91        for (i = 0; i < type_entries; i++)
  92                clear_bit(entry_index + i, mlxsw_sp->kvdl.usage);
  93}
  94