/*
* 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];
}
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];
}
/* 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:
WARN_ONCE(true, "mlx5e_am_on_top: PARKING\n");
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);
}
}
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:
WARN_ONCE(true, "mlx5e_am_turn: PARKING\n");
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;
}
}
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:
WARN_ONCE(true, "mlx5e_am_step: PARKING\n");
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;
}
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;
}
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;
}
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);
}
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;
}
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;
}
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;
}
#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) {
WARN_ONCE(true, "mlx5e_am_calc_stats: delta_us=0\n");
return;
}
curr_stats->ppms = (npkts * USEC_PER_MSEC) / delta_us;
curr_stats->epms = (MLX5E_AM_NEVENTS * USEC_PER_MSEC) / delta_us;
}
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;
}
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;
}
}
