307 lines
8.8 KiB
C
307 lines
8.8 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved */
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/spinlock.h>
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#include "spectrum_cnt.h"
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struct mlxsw_sp_counter_sub_pool {
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u64 size;
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unsigned int base_index;
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enum mlxsw_res_id entry_size_res_id;
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const char *resource_name; /* devlink resource name */
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u64 resource_id; /* devlink resource id */
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unsigned int entry_size;
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unsigned int bank_count;
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atomic_t active_entries_count;
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};
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struct mlxsw_sp_counter_pool {
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u64 pool_size;
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unsigned long *usage; /* Usage bitmap */
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spinlock_t counter_pool_lock; /* Protects counter pool allocations */
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atomic_t active_entries_count;
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unsigned int sub_pools_count;
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struct mlxsw_sp_counter_sub_pool sub_pools[];
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};
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static const struct mlxsw_sp_counter_sub_pool mlxsw_sp_counter_sub_pools[] = {
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[MLXSW_SP_COUNTER_SUB_POOL_FLOW] = {
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.entry_size_res_id = MLXSW_RES_ID_COUNTER_SIZE_PACKETS_BYTES,
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.resource_name = MLXSW_SP_RESOURCE_NAME_COUNTERS_FLOW,
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.resource_id = MLXSW_SP_RESOURCE_COUNTERS_FLOW,
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.bank_count = 6,
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},
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[MLXSW_SP_COUNTER_SUB_POOL_RIF] = {
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.entry_size_res_id = MLXSW_RES_ID_COUNTER_SIZE_ROUTER_BASIC,
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.resource_name = MLXSW_SP_RESOURCE_NAME_COUNTERS_RIF,
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.resource_id = MLXSW_SP_RESOURCE_COUNTERS_RIF,
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.bank_count = 2,
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}
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};
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static u64 mlxsw_sp_counter_sub_pool_occ_get(void *priv)
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{
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const struct mlxsw_sp_counter_sub_pool *sub_pool = priv;
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return atomic_read(&sub_pool->active_entries_count);
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}
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static int mlxsw_sp_counter_sub_pools_init(struct mlxsw_sp *mlxsw_sp)
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{
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struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
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struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
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struct mlxsw_sp_counter_sub_pool *sub_pool;
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unsigned int base_index = 0;
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enum mlxsw_res_id res_id;
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int err;
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int i;
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for (i = 0; i < pool->sub_pools_count; i++) {
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sub_pool = &pool->sub_pools[i];
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res_id = sub_pool->entry_size_res_id;
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if (!mlxsw_core_res_valid(mlxsw_sp->core, res_id))
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return -EIO;
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sub_pool->entry_size = mlxsw_core_res_get(mlxsw_sp->core,
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res_id);
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err = devl_resource_size_get(devlink,
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sub_pool->resource_id,
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&sub_pool->size);
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if (err)
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goto err_resource_size_get;
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devl_resource_occ_get_register(devlink,
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sub_pool->resource_id,
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mlxsw_sp_counter_sub_pool_occ_get,
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sub_pool);
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sub_pool->base_index = base_index;
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base_index += sub_pool->size;
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atomic_set(&sub_pool->active_entries_count, 0);
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}
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return 0;
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err_resource_size_get:
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for (i--; i >= 0; i--) {
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sub_pool = &pool->sub_pools[i];
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devl_resource_occ_get_unregister(devlink,
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sub_pool->resource_id);
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}
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return err;
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}
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static void mlxsw_sp_counter_sub_pools_fini(struct mlxsw_sp *mlxsw_sp)
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{
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struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
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struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
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struct mlxsw_sp_counter_sub_pool *sub_pool;
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int i;
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for (i = 0; i < pool->sub_pools_count; i++) {
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sub_pool = &pool->sub_pools[i];
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WARN_ON(atomic_read(&sub_pool->active_entries_count));
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devl_resource_occ_get_unregister(devlink,
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sub_pool->resource_id);
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}
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}
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static u64 mlxsw_sp_counter_pool_occ_get(void *priv)
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{
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const struct mlxsw_sp_counter_pool *pool = priv;
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return atomic_read(&pool->active_entries_count);
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}
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int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
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{
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unsigned int sub_pools_count = ARRAY_SIZE(mlxsw_sp_counter_sub_pools);
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struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
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struct mlxsw_sp_counter_pool *pool;
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int err;
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pool = kzalloc(struct_size(pool, sub_pools, sub_pools_count),
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GFP_KERNEL);
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if (!pool)
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return -ENOMEM;
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mlxsw_sp->counter_pool = pool;
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pool->sub_pools_count = sub_pools_count;
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memcpy(pool->sub_pools, mlxsw_sp_counter_sub_pools,
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flex_array_size(pool, sub_pools, pool->sub_pools_count));
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spin_lock_init(&pool->counter_pool_lock);
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atomic_set(&pool->active_entries_count, 0);
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err = devl_resource_size_get(devlink, MLXSW_SP_RESOURCE_COUNTERS,
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&pool->pool_size);
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if (err)
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goto err_pool_resource_size_get;
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devl_resource_occ_get_register(devlink, MLXSW_SP_RESOURCE_COUNTERS,
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mlxsw_sp_counter_pool_occ_get, pool);
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pool->usage = bitmap_zalloc(pool->pool_size, GFP_KERNEL);
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if (!pool->usage) {
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err = -ENOMEM;
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goto err_usage_alloc;
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}
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err = mlxsw_sp_counter_sub_pools_init(mlxsw_sp);
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if (err)
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goto err_sub_pools_init;
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return 0;
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err_sub_pools_init:
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bitmap_free(pool->usage);
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err_usage_alloc:
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devl_resource_occ_get_unregister(devlink,
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MLXSW_SP_RESOURCE_COUNTERS);
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err_pool_resource_size_get:
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kfree(pool);
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return err;
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}
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void mlxsw_sp_counter_pool_fini(struct mlxsw_sp *mlxsw_sp)
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{
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struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
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struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
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mlxsw_sp_counter_sub_pools_fini(mlxsw_sp);
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WARN_ON(find_first_bit(pool->usage, pool->pool_size) !=
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pool->pool_size);
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WARN_ON(atomic_read(&pool->active_entries_count));
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bitmap_free(pool->usage);
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devl_resource_occ_get_unregister(devlink,
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MLXSW_SP_RESOURCE_COUNTERS);
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kfree(pool);
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}
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int mlxsw_sp_counter_alloc(struct mlxsw_sp *mlxsw_sp,
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enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
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unsigned int *p_counter_index)
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{
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struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
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struct mlxsw_sp_counter_sub_pool *sub_pool;
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unsigned int entry_index;
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unsigned int stop_index;
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int i, err;
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sub_pool = &pool->sub_pools[sub_pool_id];
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stop_index = sub_pool->base_index + sub_pool->size;
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entry_index = sub_pool->base_index;
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spin_lock(&pool->counter_pool_lock);
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entry_index = find_next_zero_bit(pool->usage, stop_index, entry_index);
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if (entry_index == stop_index) {
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err = -ENOBUFS;
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goto err_alloc;
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}
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/* The sub-pools can contain non-integer number of entries
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* so we must check for overflow
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*/
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if (entry_index + sub_pool->entry_size > stop_index) {
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err = -ENOBUFS;
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goto err_alloc;
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}
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for (i = 0; i < sub_pool->entry_size; i++)
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__set_bit(entry_index + i, pool->usage);
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spin_unlock(&pool->counter_pool_lock);
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*p_counter_index = entry_index;
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atomic_add(sub_pool->entry_size, &sub_pool->active_entries_count);
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atomic_add(sub_pool->entry_size, &pool->active_entries_count);
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return 0;
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err_alloc:
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spin_unlock(&pool->counter_pool_lock);
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return err;
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}
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void mlxsw_sp_counter_free(struct mlxsw_sp *mlxsw_sp,
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enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
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unsigned int counter_index)
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{
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struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
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struct mlxsw_sp_counter_sub_pool *sub_pool;
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int i;
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if (WARN_ON(counter_index >= pool->pool_size))
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return;
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sub_pool = &pool->sub_pools[sub_pool_id];
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spin_lock(&pool->counter_pool_lock);
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for (i = 0; i < sub_pool->entry_size; i++)
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__clear_bit(counter_index + i, pool->usage);
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spin_unlock(&pool->counter_pool_lock);
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atomic_sub(sub_pool->entry_size, &sub_pool->active_entries_count);
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atomic_sub(sub_pool->entry_size, &pool->active_entries_count);
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}
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int mlxsw_sp_counter_resources_register(struct mlxsw_core *mlxsw_core)
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{
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static struct devlink_resource_size_params size_params;
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struct devlink *devlink = priv_to_devlink(mlxsw_core);
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const struct mlxsw_sp_counter_sub_pool *sub_pool;
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unsigned int total_bank_config;
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u64 sub_pool_size;
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u64 base_index;
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u64 pool_size;
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u64 bank_size;
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int err;
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int i;
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if (!MLXSW_CORE_RES_VALID(mlxsw_core, COUNTER_POOL_SIZE) ||
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!MLXSW_CORE_RES_VALID(mlxsw_core, COUNTER_BANK_SIZE))
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return -EIO;
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pool_size = MLXSW_CORE_RES_GET(mlxsw_core, COUNTER_POOL_SIZE);
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bank_size = MLXSW_CORE_RES_GET(mlxsw_core, COUNTER_BANK_SIZE);
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devlink_resource_size_params_init(&size_params, pool_size,
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pool_size, bank_size,
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DEVLINK_RESOURCE_UNIT_ENTRY);
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err = devl_resource_register(devlink,
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MLXSW_SP_RESOURCE_NAME_COUNTERS,
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pool_size,
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MLXSW_SP_RESOURCE_COUNTERS,
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DEVLINK_RESOURCE_ID_PARENT_TOP,
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&size_params);
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if (err)
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return err;
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/* Allocation is based on bank count which should be
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* specified for each sub pool statically.
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*/
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total_bank_config = 0;
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base_index = 0;
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for (i = 0; i < ARRAY_SIZE(mlxsw_sp_counter_sub_pools); i++) {
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sub_pool = &mlxsw_sp_counter_sub_pools[i];
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sub_pool_size = sub_pool->bank_count * bank_size;
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/* The last bank can't be fully used */
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if (base_index + sub_pool_size > pool_size)
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sub_pool_size = pool_size - base_index;
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base_index += sub_pool_size;
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devlink_resource_size_params_init(&size_params, sub_pool_size,
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sub_pool_size, bank_size,
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DEVLINK_RESOURCE_UNIT_ENTRY);
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err = devl_resource_register(devlink,
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sub_pool->resource_name,
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sub_pool_size,
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sub_pool->resource_id,
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MLXSW_SP_RESOURCE_COUNTERS,
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&size_params);
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if (err)
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return err;
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total_bank_config += sub_pool->bank_count;
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}
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/* Check config is valid, no bank over subscription */
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if (WARN_ON(total_bank_config > div64_u64(pool_size, bank_size) + 1))
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return -EINVAL;
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return 0;
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}
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