--- /dev/null
+/*
+ * Copyright (c) 2013-2016, Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - 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.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mlx5/driver.h>
+#include <linux/mlx5/cmd.h>
+#include "mlx5_core.h"
+
+/* Finds an entry where we can register the given rate
+ * If the rate already exists, return the entry where it is registered,
+ * otherwise return the first available entry.
+ * If the table is full, return NULL
+ */
+static struct mlx5_rl_entry *find_rl_entry(struct mlx5_rl_table *table,
+ u32 rate)
+{
+ struct mlx5_rl_entry *ret_entry = NULL;
+ bool empty_found = false;
+ int i;
+
+ for (i = 0; i < table->max_size; i++) {
+ if (table->rl_entry[i].rate == rate)
+ return &table->rl_entry[i];
+ if (!empty_found && !table->rl_entry[i].rate) {
+ empty_found = true;
+ ret_entry = &table->rl_entry[i];
+ }
+ }
+
+ return ret_entry;
+}
+
+static int mlx5_set_rate_limit_cmd(struct mlx5_core_dev *dev,
+ u32 rate, u16 index)
+{
+ u32 in[MLX5_ST_SZ_DW(set_rate_limit_in)];
+ u32 out[MLX5_ST_SZ_DW(set_rate_limit_out)];
+
+ memset(in, 0, sizeof(in));
+ memset(out, 0, sizeof(out));
+
+ MLX5_SET(set_rate_limit_in, in, opcode,
+ MLX5_CMD_OP_SET_RATE_LIMIT);
+ MLX5_SET(set_rate_limit_in, in, rate_limit_index, index);
+ MLX5_SET(set_rate_limit_in, in, rate_limit, rate);
+
+ return mlx5_cmd_exec_check_status(dev, in, sizeof(in),
+ out, sizeof(out));
+}
+
+bool mlx5_rl_is_in_range(struct mlx5_core_dev *dev, u32 rate)
+{
+ struct mlx5_rl_table *table = &dev->priv.rl_table;
+
+ return (rate <= table->max_rate && rate >= table->min_rate);
+}
+EXPORT_SYMBOL(mlx5_rl_is_in_range);
+
+int mlx5_rl_add_rate(struct mlx5_core_dev *dev, u32 rate, u16 *index)
+{
+ struct mlx5_rl_table *table = &dev->priv.rl_table;
+ struct mlx5_rl_entry *entry;
+ int err = 0;
+
+ mutex_lock(&table->rl_lock);
+
+ if (!rate || !mlx5_rl_is_in_range(dev, rate)) {
+ mlx5_core_err(dev, "Invalid rate: %u, should be %u to %u\n",
+ rate, table->min_rate, table->max_rate);
+ err = -EINVAL;
+ goto out;
+ }
+
+ entry = find_rl_entry(table, rate);
+ if (!entry) {
+ mlx5_core_err(dev, "Max number of %u rates reached\n",
+ table->max_size);
+ err = -ENOSPC;
+ goto out;
+ }
+ if (entry->refcount) {
+ /* rate already configured */
+ entry->refcount++;
+ } else {
+ /* new rate limit */
+ err = mlx5_set_rate_limit_cmd(dev, rate, entry->index);
+ if (err) {
+ mlx5_core_err(dev, "Failed configuring rate: %u (%d)\n",
+ rate, err);
+ goto out;
+ }
+ entry->rate = rate;
+ entry->refcount = 1;
+ }
+ *index = entry->index;
+
+out:
+ mutex_unlock(&table->rl_lock);
+ return err;
+}
+EXPORT_SYMBOL(mlx5_rl_add_rate);
+
+void mlx5_rl_remove_rate(struct mlx5_core_dev *dev, u32 rate)
+{
+ struct mlx5_rl_table *table = &dev->priv.rl_table;
+ struct mlx5_rl_entry *entry = NULL;
+
+ /* 0 is a reserved value for unlimited rate */
+ if (rate == 0)
+ return;
+
+ mutex_lock(&table->rl_lock);
+ entry = find_rl_entry(table, rate);
+ if (!entry || !entry->refcount) {
+ mlx5_core_warn(dev, "Rate %u is not configured\n", rate);
+ goto out;
+ }
+
+ entry->refcount--;
+ if (!entry->refcount) {
+ /* need to remove rate */
+ mlx5_set_rate_limit_cmd(dev, 0, entry->index);
+ entry->rate = 0;
+ }
+
+out:
+ mutex_unlock(&table->rl_lock);
+}
+EXPORT_SYMBOL(mlx5_rl_remove_rate);
+
+int mlx5_init_rl_table(struct mlx5_core_dev *dev)
+{
+ struct mlx5_rl_table *table = &dev->priv.rl_table;
+ int i;
+
+ mutex_init(&table->rl_lock);
+ if (!MLX5_CAP_GEN(dev, qos) || !MLX5_CAP_QOS(dev, packet_pacing)) {
+ table->max_size = 0;
+ return 0;
+ }
+
+ /* First entry is reserved for unlimited rate */
+ table->max_size = MLX5_CAP_QOS(dev, packet_pacing_rate_table_size) - 1;
+ table->max_rate = MLX5_CAP_QOS(dev, packet_pacing_max_rate);
+ table->min_rate = MLX5_CAP_QOS(dev, packet_pacing_min_rate);
+
+ table->rl_entry = kcalloc(table->max_size, sizeof(struct mlx5_rl_entry),
+ GFP_KERNEL);
+ if (!table->rl_entry)
+ return -ENOMEM;
+
+ /* The index represents the index in HW rate limit table
+ * Index 0 is reserved for unlimited rate
+ */
+ for (i = 0; i < table->max_size; i++)
+ table->rl_entry[i].index = i + 1;
+
+ /* Index 0 is reserved */
+ mlx5_core_info(dev, "Rate limit: %u rates are supported, range: %uMbps to %uMbps\n",
+ table->max_size,
+ table->min_rate >> 10,
+ table->max_rate >> 10);
+
+ return 0;
+}
+
+void mlx5_cleanup_rl_table(struct mlx5_core_dev *dev)
+{
+ struct mlx5_rl_table *table = &dev->priv.rl_table;
+ int i;
+
+ /* Clear all configured rates */
+ for (i = 0; i < table->max_size; i++)
+ if (table->rl_entry[i].rate)
+ mlx5_set_rate_limit_cmd(dev, 0,
+ table->rl_entry[i].index);
+
+ kfree(dev->priv.rl_table.rl_entry);
+}
projects / mirror_ubuntu-eoan-kernel.git / commitdiff