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/*
* 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_SINGLE_END \
(MLXSW_SP_KVDL_SINGLE_SIZE + MLXSW_SP_KVDL_SINGLE_BASE - 1)
#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_KVDL_CHUNKS_END \
(MLXSW_SP_KVDL_CHUNKS_SIZE + MLXSW_SP_KVDL_CHUNKS_BASE - 1)
#define MLXSW_SP_CHUNK_MAX 32
struct mlxsw_sp_kvdl_part_info {
unsigned int part_index;
unsigned int start_index;
unsigned int end_index;
unsigned int alloc_size;
};
struct mlxsw_sp_kvdl_part {
struct list_head list;
const struct mlxsw_sp_kvdl_part_info *info;
unsigned long usage[0]; /* Entries */
};
struct mlxsw_sp_kvdl {
struct list_head parts_list;
};
static struct mlxsw_sp_kvdl_part *
mlxsw_sp_kvdl_alloc_size_part(struct mlxsw_sp_kvdl *kvdl,
unsigned int alloc_size)
{
struct mlxsw_sp_kvdl_part *part, *min_part = NULL;
list_for_each_entry(part, &kvdl->parts_list, list) {
if (alloc_size <= part->info->alloc_size &&
(!min_part ||
part->info->alloc_size <= min_part->info->alloc_size))
min_part = part;
}
return min_part ?: ERR_PTR(-ENOBUFS);
}
static struct mlxsw_sp_kvdl_part *
mlxsw_sp_kvdl_index_part(struct mlxsw_sp_kvdl *kvdl, u32 kvdl_index)
{
struct mlxsw_sp_kvdl_part *part;
list_for_each_entry(part, &kvdl->parts_list, list) {
if (kvdl_index >= part->info->start_index &&
kvdl_index <= part->info->end_index)
return part;
}
return ERR_PTR(-EINVAL);
}
static u32
mlxsw_sp_entry_index_kvdl_index(const struct mlxsw_sp_kvdl_part_info *info,
unsigned int entry_index)
{
return info->start_index + entry_index * info->alloc_size;
}
static unsigned int
mlxsw_sp_kvdl_index_entry_index(const struct mlxsw_sp_kvdl_part_info *info,
u32 kvdl_index)
{
return (kvdl_index - info->start_index) / info->alloc_size;
}
static int mlxsw_sp_kvdl_part_alloc(struct mlxsw_sp_kvdl_part *part,
u32 *p_kvdl_index)
{
const struct mlxsw_sp_kvdl_part_info *info = part->info;
unsigned int entry_index, nr_entries;
nr_entries = (info->end_index - info->start_index + 1) /
info->alloc_size;
entry_index = find_first_zero_bit(part->usage, nr_entries);
if (entry_index == nr_entries)
return -ENOBUFS;
__set_bit(entry_index, part->usage);
*p_kvdl_index = mlxsw_sp_entry_index_kvdl_index(part->info,
entry_index);
return 0;
}
static void mlxsw_sp_kvdl_part_free(struct mlxsw_sp_kvdl_part *part,
u32 kvdl_index)
{
unsigned int entry_index;
entry_index = mlxsw_sp_kvdl_index_entry_index(part->info,
kvdl_index);
__clear_bit(entry_index, part->usage);
}
int mlxsw_sp_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, unsigned int entry_count,
u32 *p_entry_index)
{
struct mlxsw_sp_kvdl_part *part;
/* Find partition with smallest allocation size satisfying the
* requested size.
*/
part = mlxsw_sp_kvdl_alloc_size_part(mlxsw_sp->kvdl, entry_count);
if (IS_ERR(part))
return PTR_ERR(part);
return mlxsw_sp_kvdl_part_alloc(part, p_entry_index);
}
void mlxsw_sp_kvdl_free(struct mlxsw_sp *mlxsw_sp, int entry_index)
{
struct mlxsw_sp_kvdl_part *part;
part = mlxsw_sp_kvdl_index_part(mlxsw_sp->kvdl, entry_index);
if (IS_ERR(part))
return;
mlxsw_sp_kvdl_part_free(part, entry_index);
}
static const struct mlxsw_sp_kvdl_part_info kvdl_parts_info[] = {
{
.part_index = 0,
.start_index = MLXSW_SP_KVDL_SINGLE_BASE,
.end_index = MLXSW_SP_KVDL_SINGLE_END,
.alloc_size = 1,
},
{
.part_index = 1,
.start_index = MLXSW_SP_KVDL_CHUNKS_BASE,
.end_index = MLXSW_SP_KVDL_CHUNKS_END,
.alloc_size = MLXSW_SP_CHUNK_MAX,
},
};
static struct mlxsw_sp_kvdl_part *
mlxsw_sp_kvdl_part_find(struct mlxsw_sp *mlxsw_sp, unsigned int part_index)
{
struct mlxsw_sp_kvdl_part *part;
list_for_each_entry(part, &mlxsw_sp->kvdl->parts_list, list) {
if (part->info->part_index == part_index)
return part;
}
return NULL;
}
static int mlxsw_sp_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
unsigned int part_index)
{
const struct mlxsw_sp_kvdl_part_info *info;
struct mlxsw_sp_kvdl_part *part;
unsigned int nr_entries;
size_t usage_size;
info = &kvdl_parts_info[part_index];
nr_entries = (info->end_index - info->start_index + 1) /
info->alloc_size;
usage_size = BITS_TO_LONGS(nr_entries) * sizeof(unsigned long);
part = kzalloc(sizeof(*part) + usage_size, GFP_KERNEL);
if (!part)
return -ENOMEM;
part->info = info;
list_add(&part->list, &mlxsw_sp->kvdl->parts_list);
return 0;
}
static void mlxsw_sp_kvdl_part_fini(struct mlxsw_sp *mlxsw_sp,
unsigned int part_index)
{
struct mlxsw_sp_kvdl_part *part;
part = mlxsw_sp_kvdl_part_find(mlxsw_sp, part_index);
if (!part)
return;
list_del(&part->list);
kfree(part);
}
static int mlxsw_sp_kvdl_parts_init(struct mlxsw_sp *mlxsw_sp)
{
int err, i;
INIT_LIST_HEAD(&mlxsw_sp->kvdl->parts_list);
for (i = 0; i < ARRAY_SIZE(kvdl_parts_info); i++) {
err = mlxsw_sp_kvdl_part_init(mlxsw_sp, i);
if (err)
goto err_kvdl_part_init;
}
return 0;
err_kvdl_part_init:
for (i--; i >= 0; i--)
mlxsw_sp_kvdl_part_fini(mlxsw_sp, i);
return err;
}
static void mlxsw_sp_kvdl_parts_fini(struct mlxsw_sp *mlxsw_sp)
{
int i;
for (i = ARRAY_SIZE(kvdl_parts_info) - 1; i >= 0; i--)
mlxsw_sp_kvdl_part_fini(mlxsw_sp, i);
}
int mlxsw_sp_kvdl_init(struct mlxsw_sp *mlxsw_sp)
{
struct mlxsw_sp_kvdl *kvdl;
int err;
kvdl = kzalloc(sizeof(*mlxsw_sp->kvdl), GFP_KERNEL);
if (!kvdl)
return -ENOMEM;
mlxsw_sp->kvdl = kvdl;
err = mlxsw_sp_kvdl_parts_init(mlxsw_sp);
if (err)
goto err_kvdl_parts_init;
return 0;
err_kvdl_parts_init:
kfree(mlxsw_sp->kvdl);
return err;
}
void mlxsw_sp_kvdl_fini(struct mlxsw_sp *mlxsw_sp)
{
mlxsw_sp_kvdl_parts_fini(mlxsw_sp);
kfree(mlxsw_sp->kvdl);
}
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