// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB/* * Copyright (c) 2018, Mellanox Technologies inc.  All rights reserved. */ #include <linux/dim.h> /* * 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_moderrx_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_modertx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {	NET_DIM_TX_EQE_PROFILES,	NET_DIM_TX_CQE_PROFILES,}; struct dim_cq_modernet_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_modernet_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_modernet_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_modernet_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);