336 lines
8.7 KiB
C
336 lines
8.7 KiB
C
/*
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* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "en.h"
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/* Adaptive moderation profiles */
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#define MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256
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#define MLX5E_RX_AM_DEF_PROFILE_CQE 1
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#define MLX5E_RX_AM_DEF_PROFILE_EQE 1
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#define MLX5E_PARAMS_AM_NUM_PROFILES 5
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/* All profiles sizes must be MLX5E_PARAMS_AM_NUM_PROFILES */
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#define MLX5_AM_EQE_PROFILES { \
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{1, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{8, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{64, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{128, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{256, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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}
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#define MLX5_AM_CQE_PROFILES { \
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{2, 256}, \
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{8, 128}, \
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{16, 64}, \
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{32, 64}, \
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{64, 64} \
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}
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static const struct mlx5e_cq_moder
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profile[MLX5_CQ_PERIOD_NUM_MODES][MLX5E_PARAMS_AM_NUM_PROFILES] = {
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MLX5_AM_EQE_PROFILES,
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MLX5_AM_CQE_PROFILES,
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};
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static inline struct mlx5e_cq_moder mlx5e_am_get_profile(u8 cq_period_mode, int ix)
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{
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return profile[cq_period_mode][ix];
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}
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struct mlx5e_cq_moder mlx5e_am_get_def_profile(u8 rx_cq_period_mode)
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{
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int default_profile_ix;
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if (rx_cq_period_mode == MLX5_CQ_PERIOD_MODE_START_FROM_CQE)
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default_profile_ix = MLX5E_RX_AM_DEF_PROFILE_CQE;
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else /* MLX5_CQ_PERIOD_MODE_START_FROM_EQE */
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default_profile_ix = MLX5E_RX_AM_DEF_PROFILE_EQE;
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return profile[rx_cq_period_mode][default_profile_ix];
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}
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/* Adaptive moderation logic */
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enum {
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MLX5E_AM_START_MEASURE,
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MLX5E_AM_MEASURE_IN_PROGRESS,
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MLX5E_AM_APPLY_NEW_PROFILE,
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};
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enum {
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MLX5E_AM_PARKING_ON_TOP,
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MLX5E_AM_PARKING_TIRED,
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MLX5E_AM_GOING_RIGHT,
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MLX5E_AM_GOING_LEFT,
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};
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enum {
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MLX5E_AM_STATS_WORSE,
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MLX5E_AM_STATS_SAME,
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MLX5E_AM_STATS_BETTER,
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};
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enum {
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MLX5E_AM_STEPPED,
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MLX5E_AM_TOO_TIRED,
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MLX5E_AM_ON_EDGE,
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};
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static bool mlx5e_am_on_top(struct mlx5e_rx_am *am)
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{
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switch (am->tune_state) {
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case MLX5E_AM_PARKING_ON_TOP:
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case MLX5E_AM_PARKING_TIRED:
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WARN_ONCE(true, "mlx5e_am_on_top: PARKING\n");
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return true;
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case MLX5E_AM_GOING_RIGHT:
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return (am->steps_left > 1) && (am->steps_right == 1);
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default: /* MLX5E_AM_GOING_LEFT */
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return (am->steps_right > 1) && (am->steps_left == 1);
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}
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}
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static void mlx5e_am_turn(struct mlx5e_rx_am *am)
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{
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switch (am->tune_state) {
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case MLX5E_AM_PARKING_ON_TOP:
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case MLX5E_AM_PARKING_TIRED:
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WARN_ONCE(true, "mlx5e_am_turn: PARKING\n");
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break;
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case MLX5E_AM_GOING_RIGHT:
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am->tune_state = MLX5E_AM_GOING_LEFT;
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am->steps_left = 0;
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break;
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case MLX5E_AM_GOING_LEFT:
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am->tune_state = MLX5E_AM_GOING_RIGHT;
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am->steps_right = 0;
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break;
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}
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}
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static int mlx5e_am_step(struct mlx5e_rx_am *am)
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{
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if (am->tired == (MLX5E_PARAMS_AM_NUM_PROFILES * 2))
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return MLX5E_AM_TOO_TIRED;
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switch (am->tune_state) {
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case MLX5E_AM_PARKING_ON_TOP:
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case MLX5E_AM_PARKING_TIRED:
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WARN_ONCE(true, "mlx5e_am_step: PARKING\n");
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break;
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case MLX5E_AM_GOING_RIGHT:
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if (am->profile_ix == (MLX5E_PARAMS_AM_NUM_PROFILES - 1))
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return MLX5E_AM_ON_EDGE;
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am->profile_ix++;
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am->steps_right++;
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break;
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case MLX5E_AM_GOING_LEFT:
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if (am->profile_ix == 0)
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return MLX5E_AM_ON_EDGE;
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am->profile_ix--;
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am->steps_left++;
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break;
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}
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am->tired++;
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return MLX5E_AM_STEPPED;
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}
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static void mlx5e_am_park_on_top(struct mlx5e_rx_am *am)
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{
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am->steps_right = 0;
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am->steps_left = 0;
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am->tired = 0;
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am->tune_state = MLX5E_AM_PARKING_ON_TOP;
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}
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static void mlx5e_am_park_tired(struct mlx5e_rx_am *am)
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{
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am->steps_right = 0;
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am->steps_left = 0;
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am->tune_state = MLX5E_AM_PARKING_TIRED;
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}
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static void mlx5e_am_exit_parking(struct mlx5e_rx_am *am)
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{
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am->tune_state = am->profile_ix ? MLX5E_AM_GOING_LEFT :
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MLX5E_AM_GOING_RIGHT;
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mlx5e_am_step(am);
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}
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static int mlx5e_am_stats_compare(struct mlx5e_rx_am_stats *curr,
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struct mlx5e_rx_am_stats *prev)
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{
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int diff;
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if (!prev->ppms)
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return curr->ppms ? MLX5E_AM_STATS_BETTER :
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MLX5E_AM_STATS_SAME;
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diff = curr->ppms - prev->ppms;
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if (((100 * abs(diff)) / prev->ppms) > 10) /* more than 10% diff */
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return (diff > 0) ? MLX5E_AM_STATS_BETTER :
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MLX5E_AM_STATS_WORSE;
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if (!prev->epms)
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return curr->epms ? MLX5E_AM_STATS_WORSE :
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MLX5E_AM_STATS_SAME;
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diff = curr->epms - prev->epms;
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if (((100 * abs(diff)) / prev->epms) > 10) /* more than 10% diff */
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return (diff < 0) ? MLX5E_AM_STATS_BETTER :
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MLX5E_AM_STATS_WORSE;
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return MLX5E_AM_STATS_SAME;
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}
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static bool mlx5e_am_decision(struct mlx5e_rx_am_stats *curr_stats,
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struct mlx5e_rx_am *am)
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{
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int prev_state = am->tune_state;
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int prev_ix = am->profile_ix;
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int stats_res;
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int step_res;
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switch (am->tune_state) {
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case MLX5E_AM_PARKING_ON_TOP:
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stats_res = mlx5e_am_stats_compare(curr_stats, &am->prev_stats);
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if (stats_res != MLX5E_AM_STATS_SAME)
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mlx5e_am_exit_parking(am);
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break;
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case MLX5E_AM_PARKING_TIRED:
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am->tired--;
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if (!am->tired)
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mlx5e_am_exit_parking(am);
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break;
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case MLX5E_AM_GOING_RIGHT:
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case MLX5E_AM_GOING_LEFT:
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stats_res = mlx5e_am_stats_compare(curr_stats, &am->prev_stats);
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if (stats_res != MLX5E_AM_STATS_BETTER)
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mlx5e_am_turn(am);
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if (mlx5e_am_on_top(am)) {
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mlx5e_am_park_on_top(am);
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break;
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}
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step_res = mlx5e_am_step(am);
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switch (step_res) {
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case MLX5E_AM_ON_EDGE:
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mlx5e_am_park_on_top(am);
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break;
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case MLX5E_AM_TOO_TIRED:
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mlx5e_am_park_tired(am);
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break;
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}
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break;
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}
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if ((prev_state != MLX5E_AM_PARKING_ON_TOP) ||
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(am->tune_state != MLX5E_AM_PARKING_ON_TOP))
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am->prev_stats = *curr_stats;
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return am->profile_ix != prev_ix;
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}
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static void mlx5e_am_sample(struct mlx5e_rq *rq,
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struct mlx5e_rx_am_sample *s)
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{
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s->time = ktime_get();
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s->pkt_ctr = rq->stats.packets;
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s->event_ctr = rq->cq.event_ctr;
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}
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#define MLX5E_AM_NEVENTS 64
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static void mlx5e_am_calc_stats(struct mlx5e_rx_am_sample *start,
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struct mlx5e_rx_am_sample *end,
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struct mlx5e_rx_am_stats *curr_stats)
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{
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/* u32 holds up to 71 minutes, should be enough */
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u32 delta_us = ktime_us_delta(end->time, start->time);
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unsigned int npkts = end->pkt_ctr - start->pkt_ctr;
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if (!delta_us) {
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WARN_ONCE(true, "mlx5e_am_calc_stats: delta_us=0\n");
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return;
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}
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curr_stats->ppms = (npkts * USEC_PER_MSEC) / delta_us;
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curr_stats->epms = (MLX5E_AM_NEVENTS * USEC_PER_MSEC) / delta_us;
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}
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void mlx5e_rx_am_work(struct work_struct *work)
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{
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struct mlx5e_rx_am *am = container_of(work, struct mlx5e_rx_am,
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work);
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struct mlx5e_rq *rq = container_of(am, struct mlx5e_rq, am);
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struct mlx5e_cq_moder cur_profile = profile[am->mode][am->profile_ix];
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mlx5_core_modify_cq_moderation(rq->priv->mdev, &rq->cq.mcq,
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cur_profile.usec, cur_profile.pkts);
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am->state = MLX5E_AM_START_MEASURE;
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}
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void mlx5e_rx_am(struct mlx5e_rq *rq)
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{
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struct mlx5e_rx_am *am = &rq->am;
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struct mlx5e_rx_am_sample end_sample;
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struct mlx5e_rx_am_stats curr_stats;
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u16 nevents;
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switch (am->state) {
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case MLX5E_AM_MEASURE_IN_PROGRESS:
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nevents = rq->cq.event_ctr - am->start_sample.event_ctr;
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if (nevents < MLX5E_AM_NEVENTS)
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break;
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mlx5e_am_sample(rq, &end_sample);
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mlx5e_am_calc_stats(&am->start_sample, &end_sample,
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&curr_stats);
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if (mlx5e_am_decision(&curr_stats, am)) {
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am->state = MLX5E_AM_APPLY_NEW_PROFILE;
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schedule_work(&am->work);
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break;
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}
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/* fall through */
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case MLX5E_AM_START_MEASURE:
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mlx5e_am_sample(rq, &am->start_sample);
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am->state = MLX5E_AM_MEASURE_IN_PROGRESS;
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break;
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case MLX5E_AM_APPLY_NEW_PROFILE:
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break;
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}
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}
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