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>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
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.
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.
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.
35 #include <linux/kernel.h>
36 #include <linux/bitops.h>
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
48 int mlxsw_sp_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, unsigned int entry_count)
56 if (entry_count == 0 || entry_count > MLXSW_SP_CHUNK_MAX) {
58 } else if (entry_count == 1) {
59 type_base = MLXSW_SP_KVDL_SINGLE_BASE;
60 type_size = MLXSW_SP_KVDL_SINGLE_SIZE;
63 type_base = MLXSW_SP_KVDL_CHUNKS_BASE;
64 type_size = MLXSW_SP_KVDL_CHUNKS_SIZE;
65 type_entries = MLXSW_SP_CHUNK_MAX;
68 entry_index = type_base;
69 size = type_base + type_size;
70 for_each_clear_bit_from(entry_index, mlxsw_sp->kvdl.usage, size) {
73 for (i = 0; i < type_entries; i++)
74 set_bit(entry_index + i, mlxsw_sp->kvdl.usage);
80 void mlxsw_sp_kvdl_free(struct mlxsw_sp *mlxsw_sp, int entry_index)
85 if (entry_index < MLXSW_SP_KVDL_CHUNKS_BASE)
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);