summaryrefslogtreecommitdiff
path: root/net/mac80211/rc80211_minstrel_ht.h
blob: 7d6d0b720f6d0680df1150b4adedd538dfc197e5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/* 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

/* 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

struct minstrel_priv {
	struct ieee80211_hw *hw;
	bool has_mrr;
	u32 sample_switch;
	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;

	u8 sample_skipped;
	bool retry_updated;
};

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];
};

enum minstrel_sample_mode {
	MINSTREL_SAMPLE_IDLE,
	MINSTREL_SAMPLE_ACTIVE,
	MINSTREL_SAMPLE_PENDING,
};

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_last;
	unsigned int total_packets_cur;
	unsigned int total_packets;
	unsigned int sample_packets;

	/* tx flags to add for frames for this sta */
	u32 tx_flags;

	u8 sample_wait;
	u8 sample_tries;
	u8 sample_count;
	u8 sample_slow;

	enum minstrel_sample_mode sample_mode;
	u16 sample_rate;

	/* current MCS group to be sampled */
	u8 sample_group;

	u8 band;

	/* 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