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 | 335 |
1 files changed, 335 insertions, 0 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 new file mode 100644 index 0000000..1fffe48 --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c @@ -0,0 +1,335 @@ +/* + * 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; + } +} |