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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
24struct ath_softc;
25
26#define ATH_RATE_MAX 30
27#define RATE_TABLE_SIZE 72
28#define MAX_TX_RATE_PHY 48
29
30
31#define RC_INVALID 0x0000
32#define RC_LEGACY 0x0001
33#define RC_SS 0x0002
34#define RC_DS 0x0004
35#define RC_TS 0x0008
36#define RC_HT_20 0x0010
37#define RC_HT_40 0x0020
38
39#define RC_STREAM_MASK 0xe
40#define RC_DS_OR_LATER(f) ((((f) & RC_STREAM_MASK) == RC_DS) || \
41 (((f) & RC_STREAM_MASK) == (RC_DS | RC_TS)))
42#define RC_TS_ONLY(f) (((f) & RC_STREAM_MASK) == RC_TS)
43#define RC_SS_OR_LEGACY(f) ((f) & (RC_SS | RC_LEGACY))
44
45#define RC_HT_2040 (RC_HT_20 | RC_HT_40)
46#define RC_ALL_STREAM (RC_SS | RC_DS | RC_TS)
47#define RC_L_SD (RC_LEGACY | RC_SS | RC_DS)
48#define RC_L_SDT (RC_LEGACY | RC_SS | RC_DS | RC_TS)
49#define RC_HT_S_20 (RC_HT_20 | RC_SS)
50#define RC_HT_D_20 (RC_HT_20 | RC_DS)
51#define RC_HT_T_20 (RC_HT_20 | RC_TS)
52#define RC_HT_S_40 (RC_HT_40 | RC_SS)
53#define RC_HT_D_40 (RC_HT_40 | RC_DS)
54#define RC_HT_T_40 (RC_HT_40 | RC_TS)
55
56#define RC_HT_SD_20 (RC_HT_20 | RC_SS | RC_DS)
57#define RC_HT_DT_20 (RC_HT_20 | RC_DS | RC_TS)
58#define RC_HT_SD_40 (RC_HT_40 | RC_SS | RC_DS)
59#define RC_HT_DT_40 (RC_HT_40 | RC_DS | RC_TS)
60
61#define RC_HT_SD_2040 (RC_HT_2040 | RC_SS | RC_DS)
62#define RC_HT_SDT_2040 (RC_HT_2040 | RC_SS | RC_DS | RC_TS)
63
64#define RC_HT_SDT_20 (RC_HT_20 | RC_SS | RC_DS | RC_TS)
65#define RC_HT_SDT_40 (RC_HT_40 | RC_SS | RC_DS | RC_TS)
66
67#define RC_ALL (RC_LEGACY | RC_HT_2040 | RC_ALL_STREAM)
68
69enum {
70 WLAN_RC_PHY_OFDM,
71 WLAN_RC_PHY_CCK,
72 WLAN_RC_PHY_HT_20_SS,
73 WLAN_RC_PHY_HT_20_DS,
74 WLAN_RC_PHY_HT_20_TS,
75 WLAN_RC_PHY_HT_40_SS,
76 WLAN_RC_PHY_HT_40_DS,
77 WLAN_RC_PHY_HT_40_TS,
78 WLAN_RC_PHY_HT_20_SS_HGI,
79 WLAN_RC_PHY_HT_20_DS_HGI,
80 WLAN_RC_PHY_HT_20_TS_HGI,
81 WLAN_RC_PHY_HT_40_SS_HGI,
82 WLAN_RC_PHY_HT_40_DS_HGI,
83 WLAN_RC_PHY_HT_40_TS_HGI,
84 WLAN_RC_PHY_MAX
85};
86
87#define WLAN_RC_PHY_DS(_phy) ((_phy == WLAN_RC_PHY_HT_20_DS) \
88 || (_phy == WLAN_RC_PHY_HT_40_DS) \
89 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
90 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
91#define WLAN_RC_PHY_TS(_phy) ((_phy == WLAN_RC_PHY_HT_20_TS) \
92 || (_phy == WLAN_RC_PHY_HT_40_TS) \
93 || (_phy == WLAN_RC_PHY_HT_20_TS_HGI) \
94 || (_phy == WLAN_RC_PHY_HT_40_TS_HGI))
95#define WLAN_RC_PHY_20(_phy) ((_phy == WLAN_RC_PHY_HT_20_SS) \
96 || (_phy == WLAN_RC_PHY_HT_20_DS) \
97 || (_phy == WLAN_RC_PHY_HT_20_TS) \
98 || (_phy == WLAN_RC_PHY_HT_20_SS_HGI) \
99 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
100 || (_phy == WLAN_RC_PHY_HT_20_TS_HGI))
101#define WLAN_RC_PHY_40(_phy) ((_phy == WLAN_RC_PHY_HT_40_SS) \
102 || (_phy == WLAN_RC_PHY_HT_40_DS) \
103 || (_phy == WLAN_RC_PHY_HT_40_TS) \
104 || (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
105 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI) \
106 || (_phy == WLAN_RC_PHY_HT_40_TS_HGI))
107#define WLAN_RC_PHY_SGI(_phy) ((_phy == WLAN_RC_PHY_HT_20_SS_HGI) \
108 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
109 || (_phy == WLAN_RC_PHY_HT_20_TS_HGI) \
110 || (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
111 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI) \
112 || (_phy == WLAN_RC_PHY_HT_40_TS_HGI))
113
114#define WLAN_RC_PHY_HT(_phy) (_phy >= WLAN_RC_PHY_HT_20_SS)
115
116#define WLAN_RC_CAP_MODE(capflag) (((capflag & WLAN_RC_HT_FLAG) ? \
117 ((capflag & WLAN_RC_40_FLAG) ? RC_HT_40 : RC_HT_20) : RC_LEGACY))
118
119#define WLAN_RC_CAP_STREAM(capflag) (((capflag & WLAN_RC_TS_FLAG) ? \
120 (RC_TS) : ((capflag & WLAN_RC_DS_FLAG) ? RC_DS : RC_SS)))
121
122/* Return TRUE if flag supports HT20 && client supports HT20 or
123 * return TRUE if flag supports HT40 && client supports HT40.
124 * This is used becos some rates overlap between HT20/HT40.
125 */
126#define WLAN_RC_PHY_HT_VALID(flag, capflag) \
127 (((flag & RC_HT_20) && !(capflag & WLAN_RC_40_FLAG)) || \
128 ((flag & RC_HT_40) && (capflag & WLAN_RC_40_FLAG)))
129
130#define WLAN_RC_DS_FLAG (0x01)
131#define WLAN_RC_TS_FLAG (0x02)
132#define WLAN_RC_40_FLAG (0x04)
133#define WLAN_RC_SGI_FLAG (0x08)
134#define WLAN_RC_HT_FLAG (0x10)
135
136/**
137 * struct ath_rate_table - Rate Control table
138 * @rate_cnt: total number of rates for the given wireless mode
139 * @mcs_start: MCS rate index offset
140 * @rate_flags: Rate Control flags
141 * @phy: CCK/OFDM/HT20/HT40
142 * @ratekbps: rate in Kbits per second
143 * @user_ratekbps: user rate in Kbits per second
144 * @ratecode: rate that goes into HW descriptors
145 * @dot11rate: value that goes into supported
146 * rates info element of MLME
147 * @ctrl_rate: Index of next lower basic rate, used for duration computation
148 * @cw40index: Index of rates having 40MHz channel width
149 * @sgi_index: Index of rates having Short Guard Interval
150 * @ht_index: high throughput rates having 40MHz channel width and
151 * Short Guard Interval
152 * @probe_interval: interval for rate control to probe for other rates
153 * @initial_ratemax: initial ratemax value
154 */
155struct ath_rate_table {
156 int rate_cnt;
157 int mcs_start;
158 struct {
159 u16 rate_flags;
160 u8 phy;
161 u32 ratekbps;
162 u32 user_ratekbps;
163 u8 ratecode;
164 u8 dot11rate;
165 u8 ctrl_rate;
166 u8 cw40index;
167 u8 sgi_index;
168 u8 ht_index;
169 } info[RATE_TABLE_SIZE];
170 u32 probe_interval;
171 u8 initial_ratemax;
172};
173
174struct ath_rateset {
175 u8 rs_nrates;
176 u8 rs_rates[ATH_RATE_MAX];
177};
178
179struct ath_rc_stats {
180 u32 success;
181 u32 retries;
182 u32 xretries;
183 u8 per;
184};
185
186/**
187 * struct ath_rate_priv - Rate Control priv data
188 * @state: RC state
189 * @probe_rate: rate we are probing at
190 * @probe_time: msec timestamp for last probe
191 * @hw_maxretry_pktcnt: num of packets since we got HW max retry error
192 * @max_valid_rate: maximum number of valid rate
193 * @per_down_time: msec timestamp for last PER down step
194 * @valid_phy_ratecnt: valid rate count
195 * @rate_max_phy: phy index for the max rate
196 * @per: PER for every valid rate in %
197 * @probe_interval: interval for ratectrl to probe for other rates
198 * @ht_cap: HT capabilities
199 * @neg_rates: Negotatied rates
200 * @neg_ht_rates: Negotiated HT rates
201 */
202struct ath_rate_priv {
203 u8 rate_table_size;
204 u8 probe_rate;
205 u8 hw_maxretry_pktcnt;
206 u8 max_valid_rate;
207 u8 valid_rate_index[RATE_TABLE_SIZE];
208 u8 ht_cap;
209 u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
210 u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][RATE_TABLE_SIZE];
211 u8 rate_max_phy;
212 u8 per[RATE_TABLE_SIZE];
213 u32 probe_time;
214 u32 per_down_time;
215 u32 probe_interval;
216 struct ath_rateset neg_rates;
217 struct ath_rateset neg_ht_rates;
218 const struct ath_rate_table *rate_table;
219
220 struct dentry *debugfs_rcstats;
221 struct ath_rc_stats rcstats[RATE_TABLE_SIZE];
222};
223
224enum ath9k_internal_frame_type {
225 ATH9K_IFT_NOT_INTERNAL,
226 ATH9K_IFT_PAUSE,
227 ATH9K_IFT_UNPAUSE
228};
229
230#ifdef CONFIG_ATH9K_RATE_CONTROL
231int ath_rate_control_register(void);
232void ath_rate_control_unregister(void);
233#else
234static inline int ath_rate_control_register(void)
235{
236 return 0;
237}
238
239static inline void ath_rate_control_unregister(void)
240{
241}
242#endif
243
244#endif /* RC_H */