blob: fc2257753b9b39d2e9a97c06cf8df8b3230639a3 [file] [log] [blame]
// 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 <linux/spinlock.h>
#include "spectrum_cnt.h"
struct mlxsw_sp_counter_sub_pool {
u64 size;
unsigned int base_index;
enum mlxsw_res_id entry_size_res_id;
const char *resource_name; /* devlink resource name */
u64 resource_id; /* devlink resource id */
unsigned int entry_size;
unsigned int bank_count;
atomic_t active_entries_count;
};
struct mlxsw_sp_counter_pool {
u64 pool_size;
unsigned long *usage; /* Usage bitmap */
spinlock_t counter_pool_lock; /* Protects counter pool allocations */
atomic_t active_entries_count;
unsigned int sub_pools_count;
struct mlxsw_sp_counter_sub_pool sub_pools[];
};
static const struct mlxsw_sp_counter_sub_pool mlxsw_sp_counter_sub_pools[] = {
[MLXSW_SP_COUNTER_SUB_POOL_FLOW] = {
.entry_size_res_id = MLXSW_RES_ID_COUNTER_SIZE_PACKETS_BYTES,
.resource_name = MLXSW_SP_RESOURCE_NAME_COUNTERS_FLOW,
.resource_id = MLXSW_SP_RESOURCE_COUNTERS_FLOW,
.bank_count = 6,
},
[MLXSW_SP_COUNTER_SUB_POOL_RIF] = {
.entry_size_res_id = MLXSW_RES_ID_COUNTER_SIZE_ROUTER_BASIC,
.resource_name = MLXSW_SP_RESOURCE_NAME_COUNTERS_RIF,
.resource_id = MLXSW_SP_RESOURCE_COUNTERS_RIF,
.bank_count = 2,
}
};
static u64 mlxsw_sp_counter_sub_pool_occ_get(void *priv)
{
const struct mlxsw_sp_counter_sub_pool *sub_pool = priv;
return atomic_read(&sub_pool->active_entries_count);
}
static int mlxsw_sp_counter_sub_pools_init(struct mlxsw_sp *mlxsw_sp)
{
struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
struct mlxsw_sp_counter_sub_pool *sub_pool;
unsigned int base_index = 0;
enum mlxsw_res_id res_id;
int err;
int i;
for (i = 0; i < pool->sub_pools_count; i++) {
sub_pool = &pool->sub_pools[i];
res_id = sub_pool->entry_size_res_id;
if (!mlxsw_core_res_valid(mlxsw_sp->core, res_id))
return -EIO;
sub_pool->entry_size = mlxsw_core_res_get(mlxsw_sp->core,
res_id);
err = devlink_resource_size_get(devlink,
sub_pool->resource_id,
&sub_pool->size);
if (err)
goto err_resource_size_get;
devlink_resource_occ_get_register(devlink,
sub_pool->resource_id,
mlxsw_sp_counter_sub_pool_occ_get,
sub_pool);
sub_pool->base_index = base_index;
base_index += sub_pool->size;
atomic_set(&sub_pool->active_entries_count, 0);
}
return 0;
err_resource_size_get:
for (i--; i >= 0; i--) {
sub_pool = &pool->sub_pools[i];
devlink_resource_occ_get_unregister(devlink,
sub_pool->resource_id);
}
return err;
}
static void mlxsw_sp_counter_sub_pools_fini(struct mlxsw_sp *mlxsw_sp)
{
struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
struct mlxsw_sp_counter_sub_pool *sub_pool;
int i;
for (i = 0; i < pool->sub_pools_count; i++) {
sub_pool = &pool->sub_pools[i];
WARN_ON(atomic_read(&sub_pool->active_entries_count));
devlink_resource_occ_get_unregister(devlink,
sub_pool->resource_id);
}
}
static u64 mlxsw_sp_counter_pool_occ_get(void *priv)
{
const struct mlxsw_sp_counter_pool *pool = priv;
return atomic_read(&pool->active_entries_count);
}
int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
{
unsigned int sub_pools_count = ARRAY_SIZE(mlxsw_sp_counter_sub_pools);
struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
struct mlxsw_sp_counter_pool *pool;
int err;
pool = kzalloc(struct_size(pool, sub_pools, sub_pools_count),
GFP_KERNEL);
if (!pool)
return -ENOMEM;
mlxsw_sp->counter_pool = pool;
pool->sub_pools_count = sub_pools_count;
memcpy(pool->sub_pools, mlxsw_sp_counter_sub_pools,
flex_array_size(pool, sub_pools, pool->sub_pools_count));
spin_lock_init(&pool->counter_pool_lock);
atomic_set(&pool->active_entries_count, 0);
err = devlink_resource_size_get(devlink, MLXSW_SP_RESOURCE_COUNTERS,
&pool->pool_size);
if (err)
goto err_pool_resource_size_get;
devlink_resource_occ_get_register(devlink, MLXSW_SP_RESOURCE_COUNTERS,
mlxsw_sp_counter_pool_occ_get, pool);
pool->usage = bitmap_zalloc(pool->pool_size, GFP_KERNEL);
if (!pool->usage) {
err = -ENOMEM;
goto err_usage_alloc;
}
err = mlxsw_sp_counter_sub_pools_init(mlxsw_sp);
if (err)
goto err_sub_pools_init;
return 0;
err_sub_pools_init:
bitmap_free(pool->usage);
err_usage_alloc:
devlink_resource_occ_get_unregister(devlink,
MLXSW_SP_RESOURCE_COUNTERS);
err_pool_resource_size_get:
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;
struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
mlxsw_sp_counter_sub_pools_fini(mlxsw_sp);
WARN_ON(find_first_bit(pool->usage, pool->pool_size) !=
pool->pool_size);
WARN_ON(atomic_read(&pool->active_entries_count));
bitmap_free(pool->usage);
devlink_resource_occ_get_unregister(devlink,
MLXSW_SP_RESOURCE_COUNTERS);
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, err;
sub_pool = &pool->sub_pools[sub_pool_id];
stop_index = sub_pool->base_index + sub_pool->size;
entry_index = sub_pool->base_index;
spin_lock(&pool->counter_pool_lock);
entry_index = find_next_zero_bit(pool->usage, stop_index, entry_index);
if (entry_index == stop_index) {
err = -ENOBUFS;
goto err_alloc;
}
/* 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) {
err = -ENOBUFS;
goto err_alloc;
}
for (i = 0; i < sub_pool->entry_size; i++)
__set_bit(entry_index + i, pool->usage);
spin_unlock(&pool->counter_pool_lock);
*p_counter_index = entry_index;
atomic_add(sub_pool->entry_size, &sub_pool->active_entries_count);
atomic_add(sub_pool->entry_size, &pool->active_entries_count);
return 0;
err_alloc:
spin_unlock(&pool->counter_pool_lock);
return err;
}
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 = &pool->sub_pools[sub_pool_id];
spin_lock(&pool->counter_pool_lock);
for (i = 0; i < sub_pool->entry_size; i++)
__clear_bit(counter_index + i, pool->usage);
spin_unlock(&pool->counter_pool_lock);
atomic_sub(sub_pool->entry_size, &sub_pool->active_entries_count);
atomic_sub(sub_pool->entry_size, &pool->active_entries_count);
}
int mlxsw_sp_counter_resources_register(struct mlxsw_core *mlxsw_core)
{
static struct devlink_resource_size_params size_params;
struct devlink *devlink = priv_to_devlink(mlxsw_core);
const struct mlxsw_sp_counter_sub_pool *sub_pool;
unsigned int total_bank_config;
u64 sub_pool_size;
u64 base_index;
u64 pool_size;
u64 bank_size;
int err;
int i;
if (!MLXSW_CORE_RES_VALID(mlxsw_core, COUNTER_POOL_SIZE) ||
!MLXSW_CORE_RES_VALID(mlxsw_core, COUNTER_BANK_SIZE))
return -EIO;
pool_size = MLXSW_CORE_RES_GET(mlxsw_core, COUNTER_POOL_SIZE);
bank_size = MLXSW_CORE_RES_GET(mlxsw_core, COUNTER_BANK_SIZE);
devlink_resource_size_params_init(&size_params, pool_size,
pool_size, bank_size,
DEVLINK_RESOURCE_UNIT_ENTRY);
err = devlink_resource_register(devlink,
MLXSW_SP_RESOURCE_NAME_COUNTERS,
pool_size,
MLXSW_SP_RESOURCE_COUNTERS,
DEVLINK_RESOURCE_ID_PARENT_TOP,
&size_params);
if (err)
return err;
/* Allocation is based on bank count which should be
* specified for each sub pool statically.
*/
total_bank_config = 0;
base_index = 0;
for (i = 0; i < ARRAY_SIZE(mlxsw_sp_counter_sub_pools); i++) {
sub_pool = &mlxsw_sp_counter_sub_pools[i];
sub_pool_size = sub_pool->bank_count * bank_size;
/* The last bank can't be fully used */
if (base_index + sub_pool_size > pool_size)
sub_pool_size = pool_size - base_index;
base_index += sub_pool_size;
devlink_resource_size_params_init(&size_params, sub_pool_size,
sub_pool_size, bank_size,
DEVLINK_RESOURCE_UNIT_ENTRY);
err = devlink_resource_register(devlink,
sub_pool->resource_name,
sub_pool_size,
sub_pool->resource_id,
MLXSW_SP_RESOURCE_COUNTERS,
&size_params);
if (err)
return err;
total_bank_config += sub_pool->bank_count;
}
/* Check config is valid, no bank over subscription */
if (WARN_ON(total_bank_config > div64_u64(pool_size, bank_size) + 1))
return -EINVAL;
return 0;
}