| /* |
| * 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: |
| 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: |
| 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: |
| 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); |
| } |
| |
| #define IS_SIGNIFICANT_DIFF(val, ref) \ |
| (((100 * abs((val) - (ref))) / (ref)) > 10) /* more than 10% difference */ |
| |
| static int mlx5e_am_stats_compare(struct mlx5e_rx_am_stats *curr, |
| struct mlx5e_rx_am_stats *prev) |
| { |
| if (!prev->bpms) |
| return curr->bpms ? MLX5E_AM_STATS_BETTER : |
| MLX5E_AM_STATS_SAME; |
| |
| if (IS_SIGNIFICANT_DIFF(curr->bpms, prev->bpms)) |
| return (curr->bpms > prev->bpms) ? MLX5E_AM_STATS_BETTER : |
| MLX5E_AM_STATS_WORSE; |
| |
| if (!prev->ppms) |
| return curr->ppms ? MLX5E_AM_STATS_BETTER : |
| MLX5E_AM_STATS_SAME; |
| |
| if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms)) |
| return (curr->ppms > prev->ppms) ? MLX5E_AM_STATS_BETTER : |
| MLX5E_AM_STATS_WORSE; |
| if (!prev->epms) |
| return MLX5E_AM_STATS_SAME; |
| |
| if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms)) |
| return (curr->epms < prev->epms) ? 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->byte_ctr = rq->stats.bytes; |
| s->event_ctr = rq->cq.event_ctr; |
| } |
| |
| #define MLX5E_AM_NEVENTS 64 |
| #define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE) |
| #define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) & (BIT_ULL(bits) - 1)) |
| |
| 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); |
| u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr); |
| u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr, |
| start->byte_ctr); |
| |
| if (!delta_us) |
| return; |
| |
| curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us); |
| curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us); |
| curr_stats->epms = DIV_ROUND_UP(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 = BIT_GAP(BITS_PER_TYPE(u16), 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; |
| } |
| } |