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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved */
#include <linux/kernel.h>
#include <linux/bitops.h>
#include "spectrum_cnt.h"
#define MLXSW_SP_COUNTER_POOL_BANK_SIZE 4096
struct mlxsw_sp_counter_sub_pool {
unsigned int base_index;
unsigned int size;
unsigned int entry_size;
unsigned int bank_count;
};
struct mlxsw_sp_counter_pool {
unsigned int pool_size;
unsigned long *usage; /* Usage bitmap */
struct mlxsw_sp_counter_sub_pool *sub_pools;
};
static struct mlxsw_sp_counter_sub_pool mlxsw_sp_counter_sub_pools[] = {
[MLXSW_SP_COUNTER_SUB_POOL_FLOW] = {
.bank_count = 6,
},
[MLXSW_SP_COUNTER_SUB_POOL_RIF] = {
.bank_count = 2,
}
};
static int mlxsw_sp_counter_pool_validate(struct mlxsw_sp *mlxsw_sp)
{
unsigned int total_bank_config = 0;
unsigned int pool_size;
int i;
pool_size = MLXSW_CORE_RES_GET(mlxsw_sp->core, COUNTER_POOL_SIZE);
/* Check config is valid, no bank over subscription */
for (i = 0; i < ARRAY_SIZE(mlxsw_sp_counter_sub_pools); i++)
total_bank_config += mlxsw_sp_counter_sub_pools[i].bank_count;
if (total_bank_config > pool_size / MLXSW_SP_COUNTER_POOL_BANK_SIZE + 1)
return -EINVAL;
return 0;
}
static int mlxsw_sp_counter_sub_pools_prepare(struct mlxsw_sp *mlxsw_sp)
{
struct mlxsw_sp_counter_sub_pool *sub_pool;
/* Prepare generic flow pool*/
sub_pool = &mlxsw_sp_counter_sub_pools[MLXSW_SP_COUNTER_SUB_POOL_FLOW];
if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, COUNTER_SIZE_PACKETS_BYTES))
return -EIO;
sub_pool->entry_size = MLXSW_CORE_RES_GET(mlxsw_sp->core,
COUNTER_SIZE_PACKETS_BYTES);
/* Prepare erif pool*/
sub_pool = &mlxsw_sp_counter_sub_pools[MLXSW_SP_COUNTER_SUB_POOL_RIF];
if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, COUNTER_SIZE_ROUTER_BASIC))
return -EIO;
sub_pool->entry_size = MLXSW_CORE_RES_GET(mlxsw_sp->core,
COUNTER_SIZE_ROUTER_BASIC);
return 0;
}
int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
{
struct mlxsw_sp_counter_sub_pool *sub_pool;
struct mlxsw_sp_counter_pool *pool;
unsigned int base_index;
unsigned int map_size;
int i;
int err;
if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, COUNTER_POOL_SIZE))
return -EIO;
err = mlxsw_sp_counter_pool_validate(mlxsw_sp);
if (err)
return err;
err = mlxsw_sp_counter_sub_pools_prepare(mlxsw_sp);
if (err)
return err;
pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!pool)
return -ENOMEM;
pool->pool_size = MLXSW_CORE_RES_GET(mlxsw_sp->core, COUNTER_POOL_SIZE);
map_size = BITS_TO_LONGS(pool->pool_size) * sizeof(unsigned long);
pool->usage = kzalloc(map_size, GFP_KERNEL);
if (!pool->usage) {
err = -ENOMEM;
goto err_usage_alloc;
}
pool->sub_pools = mlxsw_sp_counter_sub_pools;
/* Allocation is based on bank count which should be
* specified for each sub pool statically.
*/
base_index = 0;
for (i = 0; i < ARRAY_SIZE(mlxsw_sp_counter_sub_pools); i++) {
sub_pool = &pool->sub_pools[i];
sub_pool->size = sub_pool->bank_count *
MLXSW_SP_COUNTER_POOL_BANK_SIZE;
sub_pool->base_index = base_index;
base_index += sub_pool->size;
/* The last bank can't be fully used */
if (sub_pool->base_index + sub_pool->size > pool->pool_size)
sub_pool->size = pool->pool_size - sub_pool->base_index;
}
mlxsw_sp->counter_pool = pool;
return 0;
err_usage_alloc:
kfree(pool);
return err;
}
void mlxsw_sp_counter_pool_fini(struct mlxsw_sp *mlxsw_sp)
{
struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
WARN_ON(find_first_bit(pool->usage, pool->pool_size) !=
pool->pool_size);
kfree(pool->usage);
kfree(pool);
}
int mlxsw_sp_counter_alloc(struct mlxsw_sp *mlxsw_sp,
enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
unsigned int *p_counter_index)
{
struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
struct mlxsw_sp_counter_sub_pool *sub_pool;
unsigned int entry_index;
unsigned int stop_index;
int i;
sub_pool = &mlxsw_sp_counter_sub_pools[sub_pool_id];
stop_index = sub_pool->base_index + sub_pool->size;
entry_index = sub_pool->base_index;
entry_index = find_next_zero_bit(pool->usage, stop_index, entry_index);
if (entry_index == stop_index)
return -ENOBUFS;
/* The sub-pools can contain non-integer number of entries
* so we must check for overflow
*/
if (entry_index + sub_pool->entry_size > stop_index)
return -ENOBUFS;
for (i = 0; i < sub_pool->entry_size; i++)
__set_bit(entry_index + i, pool->usage);
*p_counter_index = entry_index;
return 0;
}
void mlxsw_sp_counter_free(struct mlxsw_sp *mlxsw_sp,
enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
unsigned int counter_index)
{
struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
struct mlxsw_sp_counter_sub_pool *sub_pool;
int i;
if (WARN_ON(counter_index >= pool->pool_size))
return;
sub_pool = &mlxsw_sp_counter_sub_pools[sub_pool_id];
for (i = 0; i < sub_pool->entry_size; i++)
__clear_bit(counter_index + i, pool->usage);
}
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