diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c | 347 |
1 files changed, 0 insertions, 347 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c deleted file mode 100644 index b69a705fd787..000000000000 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c +++ /dev/null @@ -1,347 +0,0 @@ -/* - * 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) -{ - struct mlx5e_cq_moder cq_moder; - - cq_moder = profile[cq_period_mode][ix]; - cq_moder.cq_period_mode = cq_period_mode; - return cq_moder; -} - -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 mlx5e_am_get_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->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; - } -} |