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rc.h
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1 /*
2  * Copyright (c) 2004 Sam Leffler, Errno Consulting
3  * Copyright (c) 2004 Video54 Technologies, Inc.
4  * Copyright (c) 2008-2011 Atheros Communications Inc.
5  *
6  * Permission to use, copy, modify, and/or distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #ifndef RC_H
20 #define RC_H
21 
22 #include "hw.h"
23 
24 struct ath_softc;
25 
26 #define ATH_RATE_MAX 30
27 #define RATE_TABLE_SIZE 72
28 
29 #define RC_INVALID 0x0000
30 #define RC_LEGACY 0x0001
31 #define RC_SS 0x0002
32 #define RC_DS 0x0004
33 #define RC_TS 0x0008
34 #define RC_HT_20 0x0010
35 #define RC_HT_40 0x0020
36 
37 #define RC_STREAM_MASK 0xe
38 #define RC_DS_OR_LATER(f) ((((f) & RC_STREAM_MASK) == RC_DS) || \
39  (((f) & RC_STREAM_MASK) == (RC_DS | RC_TS)))
40 #define RC_TS_ONLY(f) (((f) & RC_STREAM_MASK) == RC_TS)
41 #define RC_SS_OR_LEGACY(f) ((f) & (RC_SS | RC_LEGACY))
42 
43 #define RC_HT_2040 (RC_HT_20 | RC_HT_40)
44 #define RC_ALL_STREAM (RC_SS | RC_DS | RC_TS)
45 #define RC_L_SD (RC_LEGACY | RC_SS | RC_DS)
46 #define RC_L_SDT (RC_LEGACY | RC_SS | RC_DS | RC_TS)
47 #define RC_HT_S_20 (RC_HT_20 | RC_SS)
48 #define RC_HT_D_20 (RC_HT_20 | RC_DS)
49 #define RC_HT_T_20 (RC_HT_20 | RC_TS)
50 #define RC_HT_S_40 (RC_HT_40 | RC_SS)
51 #define RC_HT_D_40 (RC_HT_40 | RC_DS)
52 #define RC_HT_T_40 (RC_HT_40 | RC_TS)
53 
54 #define RC_HT_SD_20 (RC_HT_20 | RC_SS | RC_DS)
55 #define RC_HT_DT_20 (RC_HT_20 | RC_DS | RC_TS)
56 #define RC_HT_SD_40 (RC_HT_40 | RC_SS | RC_DS)
57 #define RC_HT_DT_40 (RC_HT_40 | RC_DS | RC_TS)
58 
59 #define RC_HT_SD_2040 (RC_HT_2040 | RC_SS | RC_DS)
60 #define RC_HT_SDT_2040 (RC_HT_2040 | RC_SS | RC_DS | RC_TS)
61 
62 #define RC_HT_SDT_20 (RC_HT_20 | RC_SS | RC_DS | RC_TS)
63 #define RC_HT_SDT_40 (RC_HT_40 | RC_SS | RC_DS | RC_TS)
64 
65 #define RC_ALL (RC_LEGACY | RC_HT_2040 | RC_ALL_STREAM)
66 
67 enum {
68  WLAN_RC_PHY_OFDM,
69  WLAN_RC_PHY_CCK,
70  WLAN_RC_PHY_HT_20_SS,
71  WLAN_RC_PHY_HT_20_DS,
72  WLAN_RC_PHY_HT_20_TS,
73  WLAN_RC_PHY_HT_40_SS,
74  WLAN_RC_PHY_HT_40_DS,
75  WLAN_RC_PHY_HT_40_TS,
76  WLAN_RC_PHY_HT_20_SS_HGI,
77  WLAN_RC_PHY_HT_20_DS_HGI,
78  WLAN_RC_PHY_HT_20_TS_HGI,
79  WLAN_RC_PHY_HT_40_SS_HGI,
80  WLAN_RC_PHY_HT_40_DS_HGI,
81  WLAN_RC_PHY_HT_40_TS_HGI,
82  WLAN_RC_PHY_MAX
83 };
84 
85 #define WLAN_RC_PHY_DS(_phy) ((_phy == WLAN_RC_PHY_HT_20_DS) \
86  || (_phy == WLAN_RC_PHY_HT_40_DS) \
87  || (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
88  || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
89 #define WLAN_RC_PHY_TS(_phy) ((_phy == WLAN_RC_PHY_HT_20_TS) \
90  || (_phy == WLAN_RC_PHY_HT_40_TS) \
91  || (_phy == WLAN_RC_PHY_HT_20_TS_HGI) \
92  || (_phy == WLAN_RC_PHY_HT_40_TS_HGI))
93 #define WLAN_RC_PHY_20(_phy) ((_phy == WLAN_RC_PHY_HT_20_SS) \
94  || (_phy == WLAN_RC_PHY_HT_20_DS) \
95  || (_phy == WLAN_RC_PHY_HT_20_TS) \
96  || (_phy == WLAN_RC_PHY_HT_20_SS_HGI) \
97  || (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
98  || (_phy == WLAN_RC_PHY_HT_20_TS_HGI))
99 #define WLAN_RC_PHY_40(_phy) ((_phy == WLAN_RC_PHY_HT_40_SS) \
100  || (_phy == WLAN_RC_PHY_HT_40_DS) \
101  || (_phy == WLAN_RC_PHY_HT_40_TS) \
102  || (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
103  || (_phy == WLAN_RC_PHY_HT_40_DS_HGI) \
104  || (_phy == WLAN_RC_PHY_HT_40_TS_HGI))
105 #define WLAN_RC_PHY_SGI(_phy) ((_phy == WLAN_RC_PHY_HT_20_SS_HGI) \
106  || (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
107  || (_phy == WLAN_RC_PHY_HT_20_TS_HGI) \
108  || (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
109  || (_phy == WLAN_RC_PHY_HT_40_DS_HGI) \
110  || (_phy == WLAN_RC_PHY_HT_40_TS_HGI))
111 
112 #define WLAN_RC_PHY_HT(_phy) (_phy >= WLAN_RC_PHY_HT_20_SS)
113 
114 #define WLAN_RC_CAP_MODE(capflag) (((capflag & WLAN_RC_HT_FLAG) ? \
115  ((capflag & WLAN_RC_40_FLAG) ? RC_HT_40 : RC_HT_20) : RC_LEGACY))
116 
117 #define WLAN_RC_CAP_STREAM(capflag) (((capflag & WLAN_RC_TS_FLAG) ? \
118  (RC_TS) : ((capflag & WLAN_RC_DS_FLAG) ? RC_DS : RC_SS)))
119 
120 /* Return TRUE if flag supports HT20 && client supports HT20 or
121  * return TRUE if flag supports HT40 && client supports HT40.
122  * This is used becos some rates overlap between HT20/HT40.
123  */
124 #define WLAN_RC_PHY_HT_VALID(flag, capflag) \
125  (((flag & RC_HT_20) && !(capflag & WLAN_RC_40_FLAG)) || \
126  ((flag & RC_HT_40) && (capflag & WLAN_RC_40_FLAG)))
127 
128 #define WLAN_RC_DS_FLAG (0x01)
129 #define WLAN_RC_TS_FLAG (0x02)
130 #define WLAN_RC_40_FLAG (0x04)
131 #define WLAN_RC_SGI_FLAG (0x08)
132 #define WLAN_RC_HT_FLAG (0x10)
133 
153 struct ath_rate_table {
154  int rate_cnt;
155  int mcs_start;
156  struct {
157  u16 rate_flags;
158  u8 phy;
159  u32 ratekbps;
160  u32 user_ratekbps;
161  u8 ratecode;
162  u8 dot11rate;
163  } info[RATE_TABLE_SIZE];
164  u32 probe_interval;
165  u8 initial_ratemax;
166 };
167 
168 struct ath_rateset {
169  u8 rs_nrates;
170  u8 rs_rates[ATH_RATE_MAX];
171 };
172 
173 struct ath_rc_stats {
174  u32 success;
175  u32 retries;
176  u32 xretries;
177  u8 per;
178 };
179 
196 struct ath_rate_priv {
197  u8 rate_table_size;
198  u8 probe_rate;
199  u8 hw_maxretry_pktcnt;
200  u8 max_valid_rate;
201  u8 valid_rate_index[RATE_TABLE_SIZE];
202  u8 ht_cap;
203  u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
204  u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][RATE_TABLE_SIZE];
205  u8 rate_max_phy;
206  u8 per[RATE_TABLE_SIZE];
207  u32 probe_time;
208  u32 per_down_time;
209  u32 probe_interval;
210  struct ath_rateset neg_rates;
211  struct ath_rateset neg_ht_rates;
212  const struct ath_rate_table *rate_table;
213 
214  struct dentry *debugfs_rcstats;
215  struct ath_rc_stats rcstats[RATE_TABLE_SIZE];
216 };
217 
218 #ifdef CONFIG_ATH9K_RATE_CONTROL
219 int ath_rate_control_register(void);
220 void ath_rate_control_unregister(void);
221 #else
222 static inline int ath_rate_control_register(void)
223 {
224  return 0;
225 }
226 
227 static inline void ath_rate_control_unregister(void)
228 {
229 }
230 #endif
231 
232 #endif /* RC_H */
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