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linux-stable/drivers/infiniband/hw/mlx5/cong.c
Greg Kroah-Hartman 73eb8f03f0 infiniband: mlx5: no need to check return value of debugfs_create functions 
When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2019-01-24 09:22:29 -07:00

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/*
* Copyright (c) 2013-2017, 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/debugfs.h>
#include "mlx5_ib.h"
#include "cmd.h"
enum mlx5_ib_cong_node_type {
MLX5_IB_RROCE_ECN_RP = 1,
MLX5_IB_RROCE_ECN_NP = 2,
};
static const char * const mlx5_ib_dbg_cc_name[] = {
"rp_clamp_tgt_rate",
"rp_clamp_tgt_rate_ati",
"rp_time_reset",
"rp_byte_reset",
"rp_threshold",
"rp_ai_rate",
"rp_hai_rate",
"rp_min_dec_fac",
"rp_min_rate",
"rp_rate_to_set_on_first_cnp",
"rp_dce_tcp_g",
"rp_dce_tcp_rtt",
"rp_rate_reduce_monitor_period",
"rp_initial_alpha_value",
"rp_gd",
"np_cnp_dscp",
"np_cnp_prio_mode",
"np_cnp_prio",
};
#define MLX5_IB_RP_CLAMP_TGT_RATE_ATTR BIT(1)
#define MLX5_IB_RP_CLAMP_TGT_RATE_ATI_ATTR BIT(2)
#define MLX5_IB_RP_TIME_RESET_ATTR BIT(3)
#define MLX5_IB_RP_BYTE_RESET_ATTR BIT(4)
#define MLX5_IB_RP_THRESHOLD_ATTR BIT(5)
#define MLX5_IB_RP_AI_RATE_ATTR BIT(7)
#define MLX5_IB_RP_HAI_RATE_ATTR BIT(8)
#define MLX5_IB_RP_MIN_DEC_FAC_ATTR BIT(9)
#define MLX5_IB_RP_MIN_RATE_ATTR BIT(10)
#define MLX5_IB_RP_RATE_TO_SET_ON_FIRST_CNP_ATTR BIT(11)
#define MLX5_IB_RP_DCE_TCP_G_ATTR BIT(12)
#define MLX5_IB_RP_DCE_TCP_RTT_ATTR BIT(13)
#define MLX5_IB_RP_RATE_REDUCE_MONITOR_PERIOD_ATTR BIT(14)
#define MLX5_IB_RP_INITIAL_ALPHA_VALUE_ATTR BIT(15)
#define MLX5_IB_RP_GD_ATTR BIT(16)
#define MLX5_IB_NP_CNP_DSCP_ATTR BIT(3)
#define MLX5_IB_NP_CNP_PRIO_MODE_ATTR BIT(4)
static enum mlx5_ib_cong_node_type
mlx5_ib_param_to_node(enum mlx5_ib_dbg_cc_types param_offset)
{
if (param_offset >= MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE &&
param_offset <= MLX5_IB_DBG_CC_RP_GD)
return MLX5_IB_RROCE_ECN_RP;
else
return MLX5_IB_RROCE_ECN_NP;
}
static u32 mlx5_get_cc_param_val(void *field, int offset)
{
switch (offset) {
case MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
clamp_tgt_rate);
case MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE_ATI:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
clamp_tgt_rate_after_time_inc);
case MLX5_IB_DBG_CC_RP_TIME_RESET:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rpg_time_reset);
case MLX5_IB_DBG_CC_RP_BYTE_RESET:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rpg_byte_reset);
case MLX5_IB_DBG_CC_RP_THRESHOLD:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rpg_threshold);
case MLX5_IB_DBG_CC_RP_AI_RATE:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rpg_ai_rate);
case MLX5_IB_DBG_CC_RP_HAI_RATE:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rpg_hai_rate);
case MLX5_IB_DBG_CC_RP_MIN_DEC_FAC:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rpg_min_dec_fac);
case MLX5_IB_DBG_CC_RP_MIN_RATE:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rpg_min_rate);
case MLX5_IB_DBG_CC_RP_RATE_TO_SET_ON_FIRST_CNP:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rate_to_set_on_first_cnp);
case MLX5_IB_DBG_CC_RP_DCE_TCP_G:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
dce_tcp_g);
case MLX5_IB_DBG_CC_RP_DCE_TCP_RTT:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
dce_tcp_rtt);
case MLX5_IB_DBG_CC_RP_RATE_REDUCE_MONITOR_PERIOD:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rate_reduce_monitor_period);
case MLX5_IB_DBG_CC_RP_INITIAL_ALPHA_VALUE:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
initial_alpha_value);
case MLX5_IB_DBG_CC_RP_GD:
return MLX5_GET(cong_control_r_roce_ecn_rp, field,
rpg_gd);
case MLX5_IB_DBG_CC_NP_CNP_DSCP:
return MLX5_GET(cong_control_r_roce_ecn_np, field,
cnp_dscp);
case MLX5_IB_DBG_CC_NP_CNP_PRIO_MODE:
return MLX5_GET(cong_control_r_roce_ecn_np, field,
cnp_prio_mode);
case MLX5_IB_DBG_CC_NP_CNP_PRIO:
return MLX5_GET(cong_control_r_roce_ecn_np, field,
cnp_802p_prio);
default:
return 0;
}
}
static void mlx5_ib_set_cc_param_mask_val(void *field, int offset,
u32 var, u32 *attr_mask)
{
switch (offset) {
case MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE:
*attr_mask |= MLX5_IB_RP_CLAMP_TGT_RATE_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
clamp_tgt_rate, var);
break;
case MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE_ATI:
*attr_mask |= MLX5_IB_RP_CLAMP_TGT_RATE_ATI_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
clamp_tgt_rate_after_time_inc, var);
break;
case MLX5_IB_DBG_CC_RP_TIME_RESET:
*attr_mask |= MLX5_IB_RP_TIME_RESET_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rpg_time_reset, var);
break;
case MLX5_IB_DBG_CC_RP_BYTE_RESET:
*attr_mask |= MLX5_IB_RP_BYTE_RESET_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rpg_byte_reset, var);
break;
case MLX5_IB_DBG_CC_RP_THRESHOLD:
*attr_mask |= MLX5_IB_RP_THRESHOLD_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rpg_threshold, var);
break;
case MLX5_IB_DBG_CC_RP_AI_RATE:
*attr_mask |= MLX5_IB_RP_AI_RATE_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rpg_ai_rate, var);
break;
case MLX5_IB_DBG_CC_RP_HAI_RATE:
*attr_mask |= MLX5_IB_RP_HAI_RATE_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rpg_hai_rate, var);
break;
case MLX5_IB_DBG_CC_RP_MIN_DEC_FAC:
*attr_mask |= MLX5_IB_RP_MIN_DEC_FAC_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rpg_min_dec_fac, var);
break;
case MLX5_IB_DBG_CC_RP_MIN_RATE:
*attr_mask |= MLX5_IB_RP_MIN_RATE_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rpg_min_rate, var);
break;
case MLX5_IB_DBG_CC_RP_RATE_TO_SET_ON_FIRST_CNP:
*attr_mask |= MLX5_IB_RP_RATE_TO_SET_ON_FIRST_CNP_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rate_to_set_on_first_cnp, var);
break;
case MLX5_IB_DBG_CC_RP_DCE_TCP_G:
*attr_mask |= MLX5_IB_RP_DCE_TCP_G_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
dce_tcp_g, var);
break;
case MLX5_IB_DBG_CC_RP_DCE_TCP_RTT:
*attr_mask |= MLX5_IB_RP_DCE_TCP_RTT_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
dce_tcp_rtt, var);
break;
case MLX5_IB_DBG_CC_RP_RATE_REDUCE_MONITOR_PERIOD:
*attr_mask |= MLX5_IB_RP_RATE_REDUCE_MONITOR_PERIOD_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rate_reduce_monitor_period, var);
break;
case MLX5_IB_DBG_CC_RP_INITIAL_ALPHA_VALUE:
*attr_mask |= MLX5_IB_RP_INITIAL_ALPHA_VALUE_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
initial_alpha_value, var);
break;
case MLX5_IB_DBG_CC_RP_GD:
*attr_mask |= MLX5_IB_RP_GD_ATTR;
MLX5_SET(cong_control_r_roce_ecn_rp, field,
rpg_gd, var);
break;
case MLX5_IB_DBG_CC_NP_CNP_DSCP:
*attr_mask |= MLX5_IB_NP_CNP_DSCP_ATTR;
MLX5_SET(cong_control_r_roce_ecn_np, field, cnp_dscp, var);
break;
case MLX5_IB_DBG_CC_NP_CNP_PRIO_MODE:
*attr_mask |= MLX5_IB_NP_CNP_PRIO_MODE_ATTR;
MLX5_SET(cong_control_r_roce_ecn_np, field, cnp_prio_mode, var);
break;
case MLX5_IB_DBG_CC_NP_CNP_PRIO:
*attr_mask |= MLX5_IB_NP_CNP_PRIO_MODE_ATTR;
MLX5_SET(cong_control_r_roce_ecn_np, field, cnp_prio_mode, 0);
MLX5_SET(cong_control_r_roce_ecn_np, field, cnp_802p_prio, var);
break;
}
}
static int mlx5_ib_get_cc_params(struct mlx5_ib_dev *dev, u8 port_num,
int offset, u32 *var)
{
int outlen = MLX5_ST_SZ_BYTES(query_cong_params_out);
void *out;
void *field;
int err;
enum mlx5_ib_cong_node_type node;
struct mlx5_core_dev *mdev;
/* Takes a 1-based port number */
mdev = mlx5_ib_get_native_port_mdev(dev, port_num + 1, NULL);
if (!mdev)
return -ENODEV;
out = kvzalloc(outlen, GFP_KERNEL);
if (!out) {
err = -ENOMEM;
goto alloc_err;
}
node = mlx5_ib_param_to_node(offset);
err = mlx5_cmd_query_cong_params(mdev, node, out, outlen);
if (err)
goto free;
field = MLX5_ADDR_OF(query_cong_params_out, out, congestion_parameters);
*var = mlx5_get_cc_param_val(field, offset);
free:
kvfree(out);
alloc_err:
mlx5_ib_put_native_port_mdev(dev, port_num + 1);
return err;
}
static int mlx5_ib_set_cc_params(struct mlx5_ib_dev *dev, u8 port_num,
int offset, u32 var)
{
int inlen = MLX5_ST_SZ_BYTES(modify_cong_params_in);
void *in;
void *field;
enum mlx5_ib_cong_node_type node;
struct mlx5_core_dev *mdev;
u32 attr_mask = 0;
int err;
/* Takes a 1-based port number */
mdev = mlx5_ib_get_native_port_mdev(dev, port_num + 1, NULL);
if (!mdev)
return -ENODEV;
in = kvzalloc(inlen, GFP_KERNEL);
if (!in) {
err = -ENOMEM;
goto alloc_err;
}
MLX5_SET(modify_cong_params_in, in, opcode,
MLX5_CMD_OP_MODIFY_CONG_PARAMS);
node = mlx5_ib_param_to_node(offset);
MLX5_SET(modify_cong_params_in, in, cong_protocol, node);
field = MLX5_ADDR_OF(modify_cong_params_in, in, congestion_parameters);
mlx5_ib_set_cc_param_mask_val(field, offset, var, &attr_mask);
field = MLX5_ADDR_OF(modify_cong_params_in, in, field_select);
MLX5_SET(field_select_r_roce_rp, field, field_select_r_roce_rp,
attr_mask);
err = mlx5_cmd_modify_cong_params(mdev, in, inlen);
kvfree(in);
alloc_err:
mlx5_ib_put_native_port_mdev(dev, port_num + 1);
return err;
}
static ssize_t set_param(struct file *filp, const char __user *buf,
size_t count, loff_t *pos)
{
struct mlx5_ib_dbg_param *param = filp->private_data;
int offset = param->offset;
char lbuf[11] = { };
u32 var;
int ret;
if (count > sizeof(lbuf))
return -EINVAL;
if (copy_from_user(lbuf, buf, count))
return -EFAULT;
lbuf[sizeof(lbuf) - 1] = '\0';
if (kstrtou32(lbuf, 0, &var))
return -EINVAL;
ret = mlx5_ib_set_cc_params(param->dev, param->port_num, offset, var);
return ret ? ret : count;
}
static ssize_t get_param(struct file *filp, char __user *buf, size_t count,
loff_t *pos)
{
struct mlx5_ib_dbg_param *param = filp->private_data;
int offset = param->offset;
u32 var = 0;
int ret;
char lbuf[11];
ret = mlx5_ib_get_cc_params(param->dev, param->port_num, offset, &var);
if (ret)
return ret;
ret = snprintf(lbuf, sizeof(lbuf), "%d\n", var);
if (ret < 0)
return ret;
return simple_read_from_buffer(buf, count, pos, lbuf, ret);
}
static const struct file_operations dbg_cc_fops = {
.owner = THIS_MODULE,
.open = simple_open,
.write = set_param,
.read = get_param,
};
void mlx5_ib_cleanup_cong_debugfs(struct mlx5_ib_dev *dev, u8 port_num)
{
if (!mlx5_debugfs_root ||
!dev->port[port_num].dbg_cc_params ||
!dev->port[port_num].dbg_cc_params->root)
return;
debugfs_remove_recursive(dev->port[port_num].dbg_cc_params->root);
kfree(dev->port[port_num].dbg_cc_params);
dev->port[port_num].dbg_cc_params = NULL;
}
void mlx5_ib_init_cong_debugfs(struct mlx5_ib_dev *dev, u8 port_num)
{
struct mlx5_ib_dbg_cc_params *dbg_cc_params;
struct mlx5_core_dev *mdev;
int i;
if (!mlx5_debugfs_root)
return;
/* Takes a 1-based port number */
mdev = mlx5_ib_get_native_port_mdev(dev, port_num + 1, NULL);
if (!mdev)
return;
if (!MLX5_CAP_GEN(mdev, cc_query_allowed) ||
!MLX5_CAP_GEN(mdev, cc_modify_allowed))
goto put_mdev;
dbg_cc_params = kzalloc(sizeof(*dbg_cc_params), GFP_KERNEL);
if (!dbg_cc_params)
goto err;
dev->port[port_num].dbg_cc_params = dbg_cc_params;
dbg_cc_params->root = debugfs_create_dir("cc_params",
mdev->priv.dbg_root);
for (i = 0; i < MLX5_IB_DBG_CC_MAX; i++) {
dbg_cc_params->params[i].offset = i;
dbg_cc_params->params[i].dev = dev;
dbg_cc_params->params[i].port_num = port_num;
dbg_cc_params->params[i].dentry =
debugfs_create_file(mlx5_ib_dbg_cc_name[i],
0600, dbg_cc_params->root,
&dbg_cc_params->params[i],
&dbg_cc_fops);
}
put_mdev:
mlx5_ib_put_native_port_mdev(dev, port_num + 1);
return;
err:
mlx5_ib_warn(dev, "cong debugfs failure\n");
mlx5_ib_cleanup_cong_debugfs(dev, port_num);
mlx5_ib_put_native_port_mdev(dev, port_num + 1);
/*
* We don't want to fail driver if debugfs failed to initialize,
* so we are not forwarding error to the user.
*/
return;
}
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