diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c new file mode 100644 index 000000000000..ac321e8e5c1a --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c @@ -0,0 +1,91 @@ +/* + * 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); +} |