1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
6 #ifndef __RC_MINSTREL_HT_H
7 #define __RC_MINSTREL_HT_H
9 #include <linux/bitfield.h>
11 /* number of highest throughput rates to consider*/
12 #define MAX_THR_RATES 4
13 #define SAMPLE_COLUMNS 10 /* number of columns in sample table */
15 /* scaled fraction values */
16 #define MINSTREL_SCALE 12
17 #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
18 #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
20 #define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */
24 * Coefficients for moving average with noise filter (period=16),
27 * a1 = exp(-pi * sqrt(2) / period)
28 * coeff2 = 2 * a1 * cos(sqrt(2) * 2 * pi / period)
30 * coeff1 = 1 - coeff2 - coeff3
32 #define MINSTREL_AVG_COEFF1 (MINSTREL_FRAC(1, 1) - \
33 MINSTREL_AVG_COEFF2 - \
35 #define MINSTREL_AVG_COEFF2 0x00001499
36 #define MINSTREL_AVG_COEFF3 -0x0000092e
39 * The number of streams can be changed to 2 to reduce code
40 * size and memory footprint.
42 #define MINSTREL_MAX_STREAMS 4
43 #define MINSTREL_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */
44 #define MINSTREL_VHT_STREAM_GROUPS 6 /* BW(=3) * SGI(=2) */
46 #define MINSTREL_HT_GROUPS_NB (MINSTREL_MAX_STREAMS * \
47 MINSTREL_HT_STREAM_GROUPS)
48 #define MINSTREL_VHT_GROUPS_NB (MINSTREL_MAX_STREAMS * \
49 MINSTREL_VHT_STREAM_GROUPS)
50 #define MINSTREL_LEGACY_GROUPS_NB 2
51 #define MINSTREL_GROUPS_NB (MINSTREL_HT_GROUPS_NB + \
52 MINSTREL_VHT_GROUPS_NB + \
53 MINSTREL_LEGACY_GROUPS_NB)
55 #define MINSTREL_HT_GROUP_0 0
56 #define MINSTREL_CCK_GROUP (MINSTREL_HT_GROUP_0 + MINSTREL_HT_GROUPS_NB)
57 #define MINSTREL_OFDM_GROUP (MINSTREL_CCK_GROUP + 1)
58 #define MINSTREL_VHT_GROUP_0 (MINSTREL_OFDM_GROUP + 1)
60 #define MCS_GROUP_RATES 10
62 #define MI_RATE_IDX_MASK GENMASK(3, 0)
63 #define MI_RATE_GROUP_MASK GENMASK(15, 4)
65 #define MI_RATE(_group, _idx) \
66 (FIELD_PREP(MI_RATE_GROUP_MASK, _group) | \
67 FIELD_PREP(MI_RATE_IDX_MASK, _idx))
69 #define MI_RATE_IDX(_rate) FIELD_GET(MI_RATE_IDX_MASK, _rate)
70 #define MI_RATE_GROUP(_rate) FIELD_GET(MI_RATE_GROUP_MASK, _rate)
73 struct minstrel_priv
{
74 struct ieee80211_hw
*hw
;
79 unsigned int max_retry
;
80 unsigned int segment_size
;
81 unsigned int update_interval
;
84 u8 ofdm_rates
[NUM_NL80211_BANDS
][8];
86 #ifdef CONFIG_MAC80211_DEBUGFS
88 * enable fixed rate processing per RC
89 * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
90 * - write -1 to enable RC processing again
91 * - setting will be applied on next update
103 u16 duration
[MCS_GROUP_RATES
];
106 extern const s16 minstrel_cck_bitrates
[4];
107 extern const s16 minstrel_ofdm_bitrates
[8];
108 extern const struct mcs_group minstrel_mcs_groups
[];
110 struct minstrel_rate_stats
{
111 /* current / last sampling period attempts/success counters */
112 u16 attempts
, last_attempts
;
113 u16 success
, last_success
;
115 /* total attempts/success counters */
116 u32 att_hist
, succ_hist
;
118 /* prob_avg - moving average of prob */
122 /* maximum retry counts */
124 u8 retry_count_rtscts
;
129 struct minstrel_mcs_group_data
{
133 /* sorted rate set within a MCS group*/
134 u16 max_group_tp_rate
[MAX_THR_RATES
];
135 u16 max_group_prob_rate
;
137 /* MCS rate statistics */
138 struct minstrel_rate_stats rates
[MCS_GROUP_RATES
];
141 enum minstrel_sample_mode
{
142 MINSTREL_SAMPLE_IDLE
,
143 MINSTREL_SAMPLE_ACTIVE
,
144 MINSTREL_SAMPLE_PENDING
,
147 struct minstrel_ht_sta
{
148 struct ieee80211_sta
*sta
;
150 /* ampdu length (average, per sampling interval) */
151 unsigned int ampdu_len
;
152 unsigned int ampdu_packets
;
154 /* ampdu length (EWMA) */
155 unsigned int avg_ampdu_len
;
157 /* overall sorted rate set */
158 u16 max_tp_rate
[MAX_THR_RATES
];
161 /* time of last status update */
162 unsigned long last_stats_update
;
164 /* overhead time in usec for each frame */
165 unsigned int overhead
;
166 unsigned int overhead_rtscts
;
167 unsigned int overhead_legacy
;
168 unsigned int overhead_legacy_rtscts
;
170 unsigned int total_packets_last
;
171 unsigned int total_packets_cur
;
172 unsigned int total_packets
;
173 unsigned int sample_packets
;
175 /* tx flags to add for frames for this sta */
182 enum minstrel_sample_mode sample_mode
;
185 /* current MCS group to be sampled */
190 /* Bitfield of supported MCS rates of all groups */
191 u16 supported
[MINSTREL_GROUPS_NB
];
193 /* MCS rate group info and statistics */
194 struct minstrel_mcs_group_data groups
[MINSTREL_GROUPS_NB
];
197 void minstrel_ht_add_sta_debugfs(void *priv
, void *priv_sta
, struct dentry
*dir
);
198 int minstrel_ht_get_tp_avg(struct minstrel_ht_sta
*mi
, int group
, int rate
,