1 /*
2  * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8 
9 #ifndef __RC_MINSTREL_HT_H
10 #define __RC_MINSTREL_HT_H
11 
12 /*
13  * The number of streams can be changed to 2 to reduce code
14  * size and memory footprint.
15  */
16 #define MINSTREL_MAX_STREAMS		3
17 #define MINSTREL_HT_STREAM_GROUPS	4 /* BW(=2) * SGI(=2) */
18 #define MINSTREL_VHT_STREAM_GROUPS	6 /* BW(=3) * SGI(=2) */
19 
20 #define MINSTREL_HT_GROUPS_NB	(MINSTREL_MAX_STREAMS *		\
21 				 MINSTREL_HT_STREAM_GROUPS)
22 #define MINSTREL_VHT_GROUPS_NB	(MINSTREL_MAX_STREAMS *		\
23 				 MINSTREL_VHT_STREAM_GROUPS)
24 #define MINSTREL_CCK_GROUPS_NB	1
25 #define MINSTREL_GROUPS_NB	(MINSTREL_HT_GROUPS_NB +	\
26 				 MINSTREL_VHT_GROUPS_NB +	\
27 				 MINSTREL_CCK_GROUPS_NB)
28 
29 #define MINSTREL_HT_GROUP_0	0
30 #define MINSTREL_CCK_GROUP	(MINSTREL_HT_GROUP_0 + MINSTREL_HT_GROUPS_NB)
31 #define MINSTREL_VHT_GROUP_0	(MINSTREL_CCK_GROUP + 1)
32 
33 #define MCS_GROUP_RATES		10
34 
35 struct mcs_group {
36 	u16 flags;
37 	u8 streams;
38 	u8 shift;
39 	u16 duration[MCS_GROUP_RATES];
40 };
41 
42 extern const struct mcs_group minstrel_mcs_groups[];
43 
44 struct minstrel_mcs_group_data {
45 	u8 index;
46 	u8 column;
47 
48 	/* sorted rate set within a MCS group*/
49 	u16 max_group_tp_rate[MAX_THR_RATES];
50 	u16 max_group_prob_rate;
51 
52 	/* MCS rate statistics */
53 	struct minstrel_rate_stats rates[MCS_GROUP_RATES];
54 };
55 
56 struct minstrel_ht_sta {
57 	struct ieee80211_sta *sta;
58 
59 	/* ampdu length (average, per sampling interval) */
60 	unsigned int ampdu_len;
61 	unsigned int ampdu_packets;
62 
63 	/* ampdu length (EWMA) */
64 	unsigned int avg_ampdu_len;
65 
66 	/* overall sorted rate set */
67 	u16 max_tp_rate[MAX_THR_RATES];
68 	u16 max_prob_rate;
69 
70 	/* time of last status update */
71 	unsigned long last_stats_update;
72 
73 	/* overhead time in usec for each frame */
74 	unsigned int overhead;
75 	unsigned int overhead_rtscts;
76 
77 	unsigned int total_packets;
78 	unsigned int sample_packets;
79 
80 	/* tx flags to add for frames for this sta */
81 	u32 tx_flags;
82 
83 	u8 sample_wait;
84 	u8 sample_tries;
85 	u8 sample_count;
86 	u8 sample_slow;
87 
88 	/* current MCS group to be sampled */
89 	u8 sample_group;
90 
91 	u8 cck_supported;
92 	u8 cck_supported_short;
93 
94 	/* Bitfield of supported MCS rates of all groups */
95 	u16 supported[MINSTREL_GROUPS_NB];
96 
97 	/* MCS rate group info and statistics */
98 	struct minstrel_mcs_group_data groups[MINSTREL_GROUPS_NB];
99 };
100 
101 struct minstrel_ht_sta_priv {
102 	union {
103 		struct minstrel_ht_sta ht;
104 		struct minstrel_sta_info legacy;
105 	};
106 	void *ratelist;
107 	void *sample_table;
108 	bool is_ht;
109 };
110 
111 void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
112 int minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
113 			   int prob_ewma);
114 
115 #endif
116