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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
*/
#ifndef __RC_MINSTREL_HT_H
#define __RC_MINSTREL_HT_H
#include <linux/bitfield.h>
/* number of highest throughput rates to consider*/
#define MAX_THR_RATES 4
#define SAMPLE_COLUMNS 10 /* number of columns in sample table */
/* scaled fraction values */
#define MINSTREL_SCALE 12
#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
#define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */
#define EWMA_DIV 128
/*
* Coefficients for moving average with noise filter (period=16),
* scaled by 10 bits
*
* a1 = exp(-pi * sqrt(2) / period)
* coeff2 = 2 * a1 * cos(sqrt(2) * 2 * pi / period)
* coeff3 = -sqr(a1)
* coeff1 = 1 - coeff2 - coeff3
*/
#define MINSTREL_AVG_COEFF1 (MINSTREL_FRAC(1, 1) - \
MINSTREL_AVG_COEFF2 - \
MINSTREL_AVG_COEFF3)
#define MINSTREL_AVG_COEFF2 0x00001499
#define MINSTREL_AVG_COEFF3 -0x0000092e
/*
* The number of streams can be changed to 2 to reduce code
* size and memory footprint.
*/
#define MINSTREL_MAX_STREAMS 4
#define MINSTREL_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */
#define MINSTREL_VHT_STREAM_GROUPS 6 /* BW(=3) * SGI(=2) */
#define MINSTREL_HT_GROUPS_NB (MINSTREL_MAX_STREAMS * \
MINSTREL_HT_STREAM_GROUPS)
#define MINSTREL_VHT_GROUPS_NB (MINSTREL_MAX_STREAMS * \
MINSTREL_VHT_STREAM_GROUPS)
#define MINSTREL_LEGACY_GROUPS_NB 2
#define MINSTREL_GROUPS_NB (MINSTREL_HT_GROUPS_NB + \
MINSTREL_VHT_GROUPS_NB + \
MINSTREL_LEGACY_GROUPS_NB)
#define MINSTREL_HT_GROUP_0 0
#define MINSTREL_CCK_GROUP (MINSTREL_HT_GROUP_0 + MINSTREL_HT_GROUPS_NB)
#define MINSTREL_OFDM_GROUP (MINSTREL_CCK_GROUP + 1)
#define MINSTREL_VHT_GROUP_0 (MINSTREL_OFDM_GROUP + 1)
#define MCS_GROUP_RATES 10
#define MI_RATE_IDX_MASK GENMASK(3, 0)
#define MI_RATE_GROUP_MASK GENMASK(15, 4)
#define MI_RATE(_group, _idx) \
(FIELD_PREP(MI_RATE_GROUP_MASK, _group) | \
FIELD_PREP(MI_RATE_IDX_MASK, _idx))
#define MI_RATE_IDX(_rate) FIELD_GET(MI_RATE_IDX_MASK, _rate)
#define MI_RATE_GROUP(_rate) FIELD_GET(MI_RATE_GROUP_MASK, _rate)
#define MINSTREL_SAMPLE_RATES 5 /* rates per sample type */
#define MINSTREL_SAMPLE_INTERVAL (HZ / 50)
struct minstrel_priv {
struct ieee80211_hw *hw;
unsigned int cw_min;
unsigned int cw_max;
unsigned int max_retry;
unsigned int segment_size;
unsigned int update_interval;
u8 cck_rates[4];
u8 ofdm_rates[NUM_NL80211_BANDS][8];
#ifdef CONFIG_MAC80211_DEBUGFS
/*
* enable fixed rate processing per RC
* - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
* - write -1 to enable RC processing again
* - setting will be applied on next update
*/
u32 fixed_rate_idx;
#endif
};
struct mcs_group {
u16 flags;
u8 streams;
u8 shift;
u8 bw;
u16 duration[MCS_GROUP_RATES];
};
extern const s16 minstrel_cck_bitrates[4];
extern const s16 minstrel_ofdm_bitrates[8];
extern const struct mcs_group minstrel_mcs_groups[];
struct minstrel_rate_stats {
/* current / last sampling period attempts/success counters */
u16 attempts, last_attempts;
u16 success, last_success;
/* total attempts/success counters */
u32 att_hist, succ_hist;
/* prob_avg - moving average of prob */
u16 prob_avg;
u16 prob_avg_1;
/* maximum retry counts */
u8 retry_count;
u8 retry_count_rtscts;
bool retry_updated;
};
enum minstrel_sample_type {
MINSTREL_SAMPLE_TYPE_INC,
MINSTREL_SAMPLE_TYPE_JUMP,
MINSTREL_SAMPLE_TYPE_SLOW,
__MINSTREL_SAMPLE_TYPE_MAX
};
struct minstrel_mcs_group_data {
u8 index;
u8 column;
/* sorted rate set within a MCS group*/
u16 max_group_tp_rate[MAX_THR_RATES];
u16 max_group_prob_rate;
/* MCS rate statistics */
struct minstrel_rate_stats rates[MCS_GROUP_RATES];
};
struct minstrel_sample_category {
u8 sample_group;
u16 sample_rates[MINSTREL_SAMPLE_RATES];
u16 cur_sample_rates[MINSTREL_SAMPLE_RATES];
};
struct minstrel_ht_sta {
struct ieee80211_sta *sta;
/* ampdu length (average, per sampling interval) */
unsigned int ampdu_len;
unsigned int ampdu_packets;
/* ampdu length (EWMA) */
unsigned int avg_ampdu_len;
/* overall sorted rate set */
u16 max_tp_rate[MAX_THR_RATES];
u16 max_prob_rate;
/* time of last status update */
unsigned long last_stats_update;
/* overhead time in usec for each frame */
unsigned int overhead;
unsigned int overhead_rtscts;
unsigned int overhead_legacy;
unsigned int overhead_legacy_rtscts;
unsigned int total_packets;
unsigned int sample_packets;
/* tx flags to add for frames for this sta */
u32 tx_flags;
bool use_short_preamble;
u8 band;
u8 sample_seq;
u16 sample_rate;
unsigned long sample_time;
struct minstrel_sample_category sample[__MINSTREL_SAMPLE_TYPE_MAX];
/* Bitfield of supported MCS rates of all groups */
u16 supported[MINSTREL_GROUPS_NB];
/* MCS rate group info and statistics */
struct minstrel_mcs_group_data groups[MINSTREL_GROUPS_NB];
};
void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
int minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
int prob_avg);
#endif
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