cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c

/*
 * Copyright (c) 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 "en.h"

/* Adaptive moderation profiles */

#define MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256

#define MLX5E_RX_AM_DEF_PROFILE_CQE 1

#define MLX5E_RX_AM_DEF_PROFILE_EQE 1

#define MLX5E_PARAMS_AM_NUM_PROFILES 5

/* All profiles sizes must be MLX5E_PARAMS_AM_NUM_PROFILES */

#define MLX5_AM_EQE_PROFILES { \
        {1,   MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
        {8,   MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
        {64,  MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
        {128, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
        {256, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
}


#define MLX5_AM_CQE_PROFILES { \
        {2,  256},             \
        {8,  128},             \
        {16, 64},              \
        {32, 64},              \
        {64, 64}               \
}

static const struct mlx5e_cq_moder

profile[MLX5_CQ_PERIOD_NUM_MODES][MLX5E_PARAMS_AM_NUM_PROFILES] = {
	MLX5_AM_EQE_PROFILES,
	MLX5_AM_CQE_PROFILES,
};


static inline struct mlx5e_cq_moder mlx5e_am_get_profile(u8 cq_period_mode, int ix) { return profile[cq_period_mode][ix]; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah23100.00%1100.00%
Total23100.00%1100.00%


struct mlx5e_cq_moder mlx5e_am_get_def_profile(u8 rx_cq_period_mode) { int default_profile_ix; if (rx_cq_period_mode == MLX5_CQ_PERIOD_MODE_START_FROM_CQE) default_profile_ix = MLX5E_RX_AM_DEF_PROFILE_CQE; else /* MLX5_CQ_PERIOD_MODE_START_FROM_EQE */ default_profile_ix = MLX5E_RX_AM_DEF_PROFILE_EQE; return profile[rx_cq_period_mode][default_profile_ix]; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah37100.00%1100.00%
Total37100.00%1100.00%

/* Adaptive moderation logic */ enum { MLX5E_AM_START_MEASURE, MLX5E_AM_MEASURE_IN_PROGRESS, MLX5E_AM_APPLY_NEW_PROFILE, }; enum { MLX5E_AM_PARKING_ON_TOP, MLX5E_AM_PARKING_TIRED, MLX5E_AM_GOING_RIGHT, MLX5E_AM_GOING_LEFT, }; enum { MLX5E_AM_STATS_WORSE, MLX5E_AM_STATS_SAME, MLX5E_AM_STATS_BETTER, }; enum { MLX5E_AM_STEPPED, MLX5E_AM_TOO_TIRED, MLX5E_AM_ON_EDGE, };
static bool mlx5e_am_on_top(struct mlx5e_rx_am *am) { switch (am->tune_state) { case MLX5E_AM_PARKING_ON_TOP: case MLX5E_AM_PARKING_TIRED: return true; case MLX5E_AM_GOING_RIGHT: return (am->steps_left > 1) && (am->steps_right == 1); default: /* MLX5E_AM_GOING_LEFT */ return (am->steps_right > 1) && (am->steps_left == 1); } }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah67100.00%1100.00%
Total67100.00%1100.00%


static void mlx5e_am_turn(struct mlx5e_rx_am *am) { switch (am->tune_state) { case MLX5E_AM_PARKING_ON_TOP: case MLX5E_AM_PARKING_TIRED: break; case MLX5E_AM_GOING_RIGHT: am->tune_state = MLX5E_AM_GOING_LEFT; am->steps_left = 0; break; case MLX5E_AM_GOING_LEFT: am->tune_state = MLX5E_AM_GOING_RIGHT; am->steps_right = 0; break; } }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah58100.00%1100.00%
Total58100.00%1100.00%


static int mlx5e_am_step(struct mlx5e_rx_am *am) { if (am->tired == (MLX5E_PARAMS_AM_NUM_PROFILES * 2)) return MLX5E_AM_TOO_TIRED; switch (am->tune_state) { case MLX5E_AM_PARKING_ON_TOP: case MLX5E_AM_PARKING_TIRED: break; case MLX5E_AM_GOING_RIGHT: if (am->profile_ix == (MLX5E_PARAMS_AM_NUM_PROFILES - 1)) return MLX5E_AM_ON_EDGE; am->profile_ix++; am->steps_right++; break; case MLX5E_AM_GOING_LEFT: if (am->profile_ix == 0) return MLX5E_AM_ON_EDGE; am->profile_ix--; am->steps_left++; break; } am->tired++; return MLX5E_AM_STEPPED; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah103100.00%1100.00%
Total103100.00%1100.00%


static void mlx5e_am_park_on_top(struct mlx5e_rx_am *am) { am->steps_right = 0; am->steps_left = 0; am->tired = 0; am->tune_state = MLX5E_AM_PARKING_ON_TOP; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah35100.00%1100.00%
Total35100.00%1100.00%


static void mlx5e_am_park_tired(struct mlx5e_rx_am *am) { am->steps_right = 0; am->steps_left = 0; am->tune_state = MLX5E_AM_PARKING_TIRED; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah29100.00%1100.00%
Total29100.00%1100.00%


static void mlx5e_am_exit_parking(struct mlx5e_rx_am *am) { am->tune_state = am->profile_ix ? MLX5E_AM_GOING_LEFT : MLX5E_AM_GOING_RIGHT; mlx5e_am_step(am); }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah28100.00%1100.00%
Total28100.00%1100.00%


static int mlx5e_am_stats_compare(struct mlx5e_rx_am_stats *curr, struct mlx5e_rx_am_stats *prev) { int diff; if (!prev->ppms) return curr->ppms ? MLX5E_AM_STATS_BETTER : MLX5E_AM_STATS_SAME; diff = curr->ppms - prev->ppms; if (((100 * abs(diff)) / prev->ppms) > 10) /* more than 10% diff */ return (diff > 0) ? MLX5E_AM_STATS_BETTER : MLX5E_AM_STATS_WORSE; if (!prev->epms) return curr->epms ? MLX5E_AM_STATS_WORSE : MLX5E_AM_STATS_SAME; diff = curr->epms - prev->epms; if (((100 * abs(diff)) / prev->epms) > 10) /* more than 10% diff */ return (diff < 0) ? MLX5E_AM_STATS_BETTER : MLX5E_AM_STATS_WORSE; return MLX5E_AM_STATS_SAME; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah136100.00%1100.00%
Total136100.00%1100.00%


static bool mlx5e_am_decision(struct mlx5e_rx_am_stats *curr_stats, struct mlx5e_rx_am *am) { int prev_state = am->tune_state; int prev_ix = am->profile_ix; int stats_res; int step_res; switch (am->tune_state) { case MLX5E_AM_PARKING_ON_TOP: stats_res = mlx5e_am_stats_compare(curr_stats, &am->prev_stats); if (stats_res != MLX5E_AM_STATS_SAME) mlx5e_am_exit_parking(am); break; case MLX5E_AM_PARKING_TIRED: am->tired--; if (!am->tired) mlx5e_am_exit_parking(am); break; case MLX5E_AM_GOING_RIGHT: case MLX5E_AM_GOING_LEFT: stats_res = mlx5e_am_stats_compare(curr_stats, &am->prev_stats); if (stats_res != MLX5E_AM_STATS_BETTER) mlx5e_am_turn(am); if (mlx5e_am_on_top(am)) { mlx5e_am_park_on_top(am); break; } step_res = mlx5e_am_step(am); switch (step_res) { case MLX5E_AM_ON_EDGE: mlx5e_am_park_on_top(am); break; case MLX5E_AM_TOO_TIRED: mlx5e_am_park_tired(am); break; } break; } if ((prev_state != MLX5E_AM_PARKING_ON_TOP) || (am->tune_state != MLX5E_AM_PARKING_ON_TOP)) am->prev_stats = *curr_stats; return am->profile_ix != prev_ix; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah198100.00%1100.00%
Total198100.00%1100.00%


static void mlx5e_am_sample(struct mlx5e_rq *rq, struct mlx5e_rx_am_sample *s) { s->time = ktime_get(); s->pkt_ctr = rq->stats.packets; s->event_ctr = rq->cq.event_ctr; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah43100.00%1100.00%
Total43100.00%1100.00%

#define MLX5E_AM_NEVENTS 64
static void mlx5e_am_calc_stats(struct mlx5e_rx_am_sample *start, struct mlx5e_rx_am_sample *end, struct mlx5e_rx_am_stats *curr_stats) { /* u32 holds up to 71 minutes, should be enough */ u32 delta_us = ktime_us_delta(end->time, start->time); unsigned int npkts = end->pkt_ctr - start->pkt_ctr; if (!delta_us) return; curr_stats->ppms = (npkts * USEC_PER_MSEC) / delta_us; curr_stats->epms = (MLX5E_AM_NEVENTS * USEC_PER_MSEC) / delta_us; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah78100.00%1100.00%
Total78100.00%1100.00%


void mlx5e_rx_am_work(struct work_struct *work) { struct mlx5e_rx_am *am = container_of(work, struct mlx5e_rx_am, work); struct mlx5e_rq *rq = container_of(am, struct mlx5e_rq, am); struct mlx5e_cq_moder cur_profile = profile[am->mode][am->profile_ix]; mlx5_core_modify_cq_moderation(rq->priv->mdev, &rq->cq.mcq, cur_profile.usec, cur_profile.pkts); am->state = MLX5E_AM_START_MEASURE; }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah86100.00%1100.00%
Total86100.00%1100.00%


void mlx5e_rx_am(struct mlx5e_rq *rq) { struct mlx5e_rx_am *am = &rq->am; struct mlx5e_rx_am_sample end_sample; struct mlx5e_rx_am_stats curr_stats; u16 nevents; switch (am->state) { case MLX5E_AM_MEASURE_IN_PROGRESS: nevents = rq->cq.event_ctr - am->start_sample.event_ctr; if (nevents < MLX5E_AM_NEVENTS) break; mlx5e_am_sample(rq, &end_sample); mlx5e_am_calc_stats(&am->start_sample, &end_sample, &curr_stats); if (mlx5e_am_decision(&curr_stats, am)) { am->state = MLX5E_AM_APPLY_NEW_PROFILE; schedule_work(&am->work); break; } /* fall through */ case MLX5E_AM_START_MEASURE: mlx5e_am_sample(rq, &am->start_sample); am->state = MLX5E_AM_MEASURE_IN_PROGRESS; break; case MLX5E_AM_APPLY_NEW_PROFILE: break; } }

Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah137100.00%1100.00%
Total137100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Gil Rockah1149100.00%1100.00%
Total1149100.00%1100.00%
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