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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#include "en/tc_priv.h"
#include "post_meter.h"
#include "en/tc/post_act.h"
#define MLX5_PACKET_COLOR_BITS MLX5_REG_MAPPING_MBITS(PACKET_COLOR_TO_REG)
#define MLX5_PACKET_COLOR_MASK MLX5_REG_MAPPING_MASK(PACKET_COLOR_TO_REG)
struct mlx5e_post_meter_priv {
struct mlx5_flow_table *ft;
struct mlx5_flow_group *fg;
struct mlx5_flow_handle *fwd_green_rule;
struct mlx5_flow_handle *drop_red_rule;
};
struct mlx5_flow_table *
mlx5e_post_meter_get_ft(struct mlx5e_post_meter_priv *post_meter)
{
return post_meter->ft;
}
static int
mlx5e_post_meter_table_create(struct mlx5e_priv *priv,
enum mlx5_flow_namespace_type ns_type,
struct mlx5e_post_meter_priv *post_meter)
{
struct mlx5_flow_table_attr ft_attr = {};
struct mlx5_flow_namespace *root_ns;
root_ns = mlx5_get_flow_namespace(priv->mdev, ns_type);
if (!root_ns) {
mlx5_core_warn(priv->mdev, "Failed to get namespace for flow meter\n");
return -EOPNOTSUPP;
}
ft_attr.flags = MLX5_FLOW_TABLE_UNMANAGED;
ft_attr.prio = FDB_SLOW_PATH;
ft_attr.max_fte = 2;
ft_attr.level = 1;
post_meter->ft = mlx5_create_flow_table(root_ns, &ft_attr);
if (IS_ERR(post_meter->ft)) {
mlx5_core_warn(priv->mdev, "Failed to create post_meter table\n");
return PTR_ERR(post_meter->ft);
}
return 0;
}
static int
mlx5e_post_meter_fg_create(struct mlx5e_priv *priv,
struct mlx5e_post_meter_priv *post_meter)
{
int inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
void *misc2, *match_criteria;
u32 *flow_group_in;
int err = 0;
flow_group_in = kvzalloc(inlen, GFP_KERNEL);
if (!flow_group_in)
return -ENOMEM;
MLX5_SET(create_flow_group_in, flow_group_in, match_criteria_enable,
MLX5_MATCH_MISC_PARAMETERS_2);
match_criteria = MLX5_ADDR_OF(create_flow_group_in, flow_group_in,
match_criteria);
misc2 = MLX5_ADDR_OF(fte_match_param, match_criteria, misc_parameters_2);
MLX5_SET(fte_match_set_misc2, misc2, metadata_reg_c_5, MLX5_PACKET_COLOR_MASK);
MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index, 0);
MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, 1);
post_meter->fg = mlx5_create_flow_group(post_meter->ft, flow_group_in);
if (IS_ERR(post_meter->fg)) {
mlx5_core_warn(priv->mdev, "Failed to create post_meter flow group\n");
err = PTR_ERR(post_meter->fg);
}
kvfree(flow_group_in);
return err;
}
static int
mlx5e_post_meter_rules_create(struct mlx5e_priv *priv,
struct mlx5e_post_meter_priv *post_meter,
struct mlx5e_post_act *post_act,
struct mlx5_fc *green_counter,
struct mlx5_fc *red_counter)
{
struct mlx5_flow_destination dest[2] = {};
struct mlx5_flow_act flow_act = {};
struct mlx5_flow_handle *rule;
struct mlx5_flow_spec *spec;
int err;
spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
if (!spec)
return -ENOMEM;
mlx5e_tc_match_to_reg_match(spec, PACKET_COLOR_TO_REG,
MLX5_FLOW_METER_COLOR_RED, MLX5_PACKET_COLOR_MASK);
flow_act.action = MLX5_FLOW_CONTEXT_ACTION_DROP |
MLX5_FLOW_CONTEXT_ACTION_COUNT;
flow_act.flags |= FLOW_ACT_IGNORE_FLOW_LEVEL;
dest[0].type = MLX5_FLOW_DESTINATION_TYPE_COUNTER;
dest[0].counter_id = mlx5_fc_id(red_counter);
rule = mlx5_add_flow_rules(post_meter->ft, spec, &flow_act, dest, 1);
if (IS_ERR(rule)) {
mlx5_core_warn(priv->mdev, "Failed to create post_meter flow drop rule\n");
err = PTR_ERR(rule);
goto err_red;
}
post_meter->drop_red_rule = rule;
mlx5e_tc_match_to_reg_match(spec, PACKET_COLOR_TO_REG,
MLX5_FLOW_METER_COLOR_GREEN, MLX5_PACKET_COLOR_MASK);
flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST |
MLX5_FLOW_CONTEXT_ACTION_COUNT;
dest[0].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
dest[0].ft = mlx5e_tc_post_act_get_ft(post_act);
dest[1].type = MLX5_FLOW_DESTINATION_TYPE_COUNTER;
dest[1].counter_id = mlx5_fc_id(green_counter);
rule = mlx5_add_flow_rules(post_meter->ft, spec, &flow_act, dest, 2);
if (IS_ERR(rule)) {
mlx5_core_warn(priv->mdev, "Failed to create post_meter flow fwd rule\n");
err = PTR_ERR(rule);
goto err_green;
}
post_meter->fwd_green_rule = rule;
kvfree(spec);
return 0;
err_green:
mlx5_del_flow_rules(post_meter->drop_red_rule);
err_red:
kvfree(spec);
return err;
}
static void
mlx5e_post_meter_rules_destroy(struct mlx5e_post_meter_priv *post_meter)
{
mlx5_del_flow_rules(post_meter->drop_red_rule);
mlx5_del_flow_rules(post_meter->fwd_green_rule);
}
static void
mlx5e_post_meter_fg_destroy(struct mlx5e_post_meter_priv *post_meter)
{
mlx5_destroy_flow_group(post_meter->fg);
}
static void
mlx5e_post_meter_table_destroy(struct mlx5e_post_meter_priv *post_meter)
{
mlx5_destroy_flow_table(post_meter->ft);
}
struct mlx5e_post_meter_priv *
mlx5e_post_meter_init(struct mlx5e_priv *priv,
enum mlx5_flow_namespace_type ns_type,
struct mlx5e_post_act *post_act,
struct mlx5_fc *green_counter,
struct mlx5_fc *red_counter)
{
struct mlx5e_post_meter_priv *post_meter;
int err;
post_meter = kzalloc(sizeof(*post_meter), GFP_KERNEL);
if (!post_meter)
return ERR_PTR(-ENOMEM);
err = mlx5e_post_meter_table_create(priv, ns_type, post_meter);
if (err)
goto err_ft;
err = mlx5e_post_meter_fg_create(priv, post_meter);
if (err)
goto err_fg;
err = mlx5e_post_meter_rules_create(priv, post_meter, post_act, green_counter,
red_counter);
if (err)
goto err_rules;
return post_meter;
err_rules:
mlx5e_post_meter_fg_destroy(post_meter);
err_fg:
mlx5e_post_meter_table_destroy(post_meter);
err_ft:
kfree(post_meter);
return ERR_PTR(err);
}
void
mlx5e_post_meter_cleanup(struct mlx5e_post_meter_priv *post_meter)
{
mlx5e_post_meter_rules_destroy(post_meter);
mlx5e_post_meter_fg_destroy(post_meter);
mlx5e_post_meter_table_destroy(post_meter);
kfree(post_meter);
}
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