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lib/dim/net_dim.c
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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB /* * Copyright (c) 2018, Mellanox Technologies inc. All rights reserved. */ #include <linux/dim.h> |
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/* * Net DIM profiles: * There are different set of profiles for each CQ period mode. * There are different set of profiles for RX/TX CQs. * Each profile size must be of NET_DIM_PARAMS_NUM_PROFILES */ #define NET_DIM_PARAMS_NUM_PROFILES 5 #define NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256 #define NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE 128 #define NET_DIM_DEF_PROFILE_CQE 1 #define NET_DIM_DEF_PROFILE_EQE 1 #define NET_DIM_RX_EQE_PROFILES { \ {1, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ {8, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ {64, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ {128, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ {256, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ } #define NET_DIM_RX_CQE_PROFILES { \ {2, 256}, \ {8, 128}, \ {16, 64}, \ {32, 64}, \ {64, 64} \ } #define NET_DIM_TX_EQE_PROFILES { \ {1, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \ {8, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \ {32, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \ {64, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \ {128, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE} \ } #define NET_DIM_TX_CQE_PROFILES { \ {5, 128}, \ {8, 64}, \ {16, 32}, \ {32, 32}, \ {64, 32} \ } static const struct dim_cq_moder rx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = { NET_DIM_RX_EQE_PROFILES, NET_DIM_RX_CQE_PROFILES, }; static const struct dim_cq_moder tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = { NET_DIM_TX_EQE_PROFILES, NET_DIM_TX_CQE_PROFILES, }; |
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struct dim_cq_moder net_dim_get_rx_moderation(u8 cq_period_mode, int ix) { struct dim_cq_moder cq_moder = rx_profile[cq_period_mode][ix]; cq_moder.cq_period_mode = cq_period_mode; return cq_moder; } EXPORT_SYMBOL(net_dim_get_rx_moderation); struct dim_cq_moder net_dim_get_def_rx_moderation(u8 cq_period_mode) { u8 profile_ix = cq_period_mode == DIM_CQ_PERIOD_MODE_START_FROM_CQE ? NET_DIM_DEF_PROFILE_CQE : NET_DIM_DEF_PROFILE_EQE; return net_dim_get_rx_moderation(cq_period_mode, profile_ix); } EXPORT_SYMBOL(net_dim_get_def_rx_moderation); struct dim_cq_moder net_dim_get_tx_moderation(u8 cq_period_mode, int ix) { struct dim_cq_moder cq_moder = tx_profile[cq_period_mode][ix]; cq_moder.cq_period_mode = cq_period_mode; return cq_moder; } EXPORT_SYMBOL(net_dim_get_tx_moderation); struct dim_cq_moder net_dim_get_def_tx_moderation(u8 cq_period_mode) { u8 profile_ix = cq_period_mode == DIM_CQ_PERIOD_MODE_START_FROM_CQE ? NET_DIM_DEF_PROFILE_CQE : NET_DIM_DEF_PROFILE_EQE; return net_dim_get_tx_moderation(cq_period_mode, profile_ix); } EXPORT_SYMBOL(net_dim_get_def_tx_moderation); static int net_dim_step(struct dim *dim) { if (dim->tired == (NET_DIM_PARAMS_NUM_PROFILES * 2)) return DIM_TOO_TIRED; switch (dim->tune_state) { case DIM_PARKING_ON_TOP: case DIM_PARKING_TIRED: break; case DIM_GOING_RIGHT: if (dim->profile_ix == (NET_DIM_PARAMS_NUM_PROFILES - 1)) return DIM_ON_EDGE; dim->profile_ix++; dim->steps_right++; break; case DIM_GOING_LEFT: if (dim->profile_ix == 0) return DIM_ON_EDGE; dim->profile_ix--; dim->steps_left++; break; } dim->tired++; return DIM_STEPPED; } static void net_dim_exit_parking(struct dim *dim) { dim->tune_state = dim->profile_ix ? DIM_GOING_LEFT : DIM_GOING_RIGHT; net_dim_step(dim); } static int net_dim_stats_compare(struct dim_stats *curr, struct dim_stats *prev) { if (!prev->bpms) return curr->bpms ? DIM_STATS_BETTER : DIM_STATS_SAME; if (IS_SIGNIFICANT_DIFF(curr->bpms, prev->bpms)) return (curr->bpms > prev->bpms) ? DIM_STATS_BETTER : DIM_STATS_WORSE; if (!prev->ppms) return curr->ppms ? DIM_STATS_BETTER : DIM_STATS_SAME; if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms)) return (curr->ppms > prev->ppms) ? DIM_STATS_BETTER : DIM_STATS_WORSE; if (!prev->epms) return DIM_STATS_SAME; if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms)) return (curr->epms < prev->epms) ? DIM_STATS_BETTER : DIM_STATS_WORSE; return DIM_STATS_SAME; } static bool net_dim_decision(struct dim_stats *curr_stats, struct dim *dim) { int prev_state = dim->tune_state; int prev_ix = dim->profile_ix; int stats_res; int step_res; switch (dim->tune_state) { case DIM_PARKING_ON_TOP: stats_res = net_dim_stats_compare(curr_stats, &dim->prev_stats); if (stats_res != DIM_STATS_SAME) net_dim_exit_parking(dim); break; case DIM_PARKING_TIRED: dim->tired--; if (!dim->tired) net_dim_exit_parking(dim); break; case DIM_GOING_RIGHT: case DIM_GOING_LEFT: stats_res = net_dim_stats_compare(curr_stats, &dim->prev_stats); if (stats_res != DIM_STATS_BETTER) dim_turn(dim); if (dim_on_top(dim)) { dim_park_on_top(dim); break; } step_res = net_dim_step(dim); switch (step_res) { case DIM_ON_EDGE: dim_park_on_top(dim); break; case DIM_TOO_TIRED: dim_park_tired(dim); break; } break; } if (prev_state != DIM_PARKING_ON_TOP || dim->tune_state != DIM_PARKING_ON_TOP) dim->prev_stats = *curr_stats; return dim->profile_ix != prev_ix; } void net_dim(struct dim *dim, struct dim_sample end_sample) { struct dim_stats curr_stats; u16 nevents; switch (dim->state) { case DIM_MEASURE_IN_PROGRESS: nevents = BIT_GAP(BITS_PER_TYPE(u16), end_sample.event_ctr, dim->start_sample.event_ctr); if (nevents < DIM_NEVENTS) break; dim_calc_stats(&dim->start_sample, &end_sample, &curr_stats); if (net_dim_decision(&curr_stats, dim)) { dim->state = DIM_APPLY_NEW_PROFILE; schedule_work(&dim->work); break; } /* fall through */ case DIM_START_MEASURE: dim_update_sample(end_sample.event_ctr, end_sample.pkt_ctr, end_sample.byte_ctr, &dim->start_sample); dim->state = DIM_MEASURE_IN_PROGRESS; break; case DIM_APPLY_NEW_PROFILE: break; } } EXPORT_SYMBOL(net_dim); |