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ec8aa669 | 1 | /* |
a0497f9f | 2 | * Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org> |
ec8aa669 FF |
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 | #include <linux/netdevice.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/skbuff.h> | |
11 | #include <linux/debugfs.h> | |
12 | #include <linux/random.h> | |
9208247d | 13 | #include <linux/moduleparam.h> |
ec8aa669 FF |
14 | #include <linux/ieee80211.h> |
15 | #include <net/mac80211.h> | |
16 | #include "rate.h" | |
782dda00 | 17 | #include "sta_info.h" |
ec8aa669 FF |
18 | #include "rc80211_minstrel.h" |
19 | #include "rc80211_minstrel_ht.h" | |
20 | ||
d66c2582 | 21 | #define AVG_AMPDU_SIZE 16 |
ec8aa669 | 22 | #define AVG_PKT_SIZE 1200 |
ec8aa669 FF |
23 | |
24 | /* Number of bits for an average sized packet */ | |
d66c2582 | 25 | #define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3) |
ec8aa669 FF |
26 | |
27 | /* Number of symbols for a packet with (bps) bits per symbol */ | |
00591cea | 28 | #define MCS_NSYMS(bps) DIV_ROUND_UP(MCS_NBITS, (bps)) |
ec8aa669 | 29 | |
ed97a13c | 30 | /* Transmission time (nanoseconds) for a packet containing (syms) symbols */ |
ec8aa669 FF |
31 | #define MCS_SYMBOL_TIME(sgi, syms) \ |
32 | (sgi ? \ | |
ed97a13c FF |
33 | ((syms) * 18000 + 4000) / 5 : /* syms * 3.6 us */ \ |
34 | ((syms) * 1000) << 2 /* syms * 4 us */ \ | |
ec8aa669 FF |
35 | ) |
36 | ||
37 | /* Transmit duration for the raw data part of an average sized packet */ | |
d66c2582 FF |
38 | #define MCS_DURATION(streams, sgi, bps) \ |
39 | (MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) / AVG_AMPDU_SIZE) | |
ec8aa669 | 40 | |
8a0ee4fe KB |
41 | #define BW_20 0 |
42 | #define BW_40 1 | |
9208247d | 43 | #define BW_80 2 |
8a0ee4fe | 44 | |
a5f69d94 HS |
45 | /* |
46 | * Define group sort order: HT40 -> SGI -> #streams | |
47 | */ | |
48 | #define GROUP_IDX(_streams, _sgi, _ht40) \ | |
8a0ee4fe | 49 | MINSTREL_HT_GROUP_0 + \ |
a5f69d94 | 50 | MINSTREL_MAX_STREAMS * 2 * _ht40 + \ |
8a0ee4fe | 51 | MINSTREL_MAX_STREAMS * _sgi + \ |
a5f69d94 HS |
52 | _streams - 1 |
53 | ||
ec8aa669 | 54 | /* MCS rate information for an MCS group */ |
a5f69d94 HS |
55 | #define MCS_GROUP(_streams, _sgi, _ht40) \ |
56 | [GROUP_IDX(_streams, _sgi, _ht40)] = { \ | |
ec8aa669 FF |
57 | .streams = _streams, \ |
58 | .flags = \ | |
3ec373c4 | 59 | IEEE80211_TX_RC_MCS | \ |
ec8aa669 FF |
60 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
61 | (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ | |
62 | .duration = { \ | |
63 | MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26), \ | |
64 | MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52), \ | |
65 | MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78), \ | |
66 | MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104), \ | |
67 | MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156), \ | |
68 | MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208), \ | |
69 | MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234), \ | |
70 | MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) \ | |
71 | } \ | |
72 | } | |
73 | ||
9208247d KB |
74 | #define VHT_GROUP_IDX(_streams, _sgi, _bw) \ |
75 | (MINSTREL_VHT_GROUP_0 + \ | |
76 | MINSTREL_MAX_STREAMS * 2 * (_bw) + \ | |
77 | MINSTREL_MAX_STREAMS * (_sgi) + \ | |
78 | (_streams) - 1) | |
79 | ||
80 | #define BW2VBPS(_bw, r3, r2, r1) \ | |
81 | (_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1) | |
82 | ||
83 | #define VHT_GROUP(_streams, _sgi, _bw) \ | |
84 | [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \ | |
85 | .streams = _streams, \ | |
86 | .flags = \ | |
87 | IEEE80211_TX_RC_VHT_MCS | \ | |
88 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ | |
89 | (_bw == BW_80 ? IEEE80211_TX_RC_80_MHZ_WIDTH : \ | |
90 | _bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ | |
91 | .duration = { \ | |
92 | MCS_DURATION(_streams, _sgi, \ | |
93 | BW2VBPS(_bw, 117, 54, 26)), \ | |
94 | MCS_DURATION(_streams, _sgi, \ | |
95 | BW2VBPS(_bw, 234, 108, 52)), \ | |
96 | MCS_DURATION(_streams, _sgi, \ | |
97 | BW2VBPS(_bw, 351, 162, 78)), \ | |
98 | MCS_DURATION(_streams, _sgi, \ | |
99 | BW2VBPS(_bw, 468, 216, 104)), \ | |
100 | MCS_DURATION(_streams, _sgi, \ | |
101 | BW2VBPS(_bw, 702, 324, 156)), \ | |
102 | MCS_DURATION(_streams, _sgi, \ | |
103 | BW2VBPS(_bw, 936, 432, 208)), \ | |
104 | MCS_DURATION(_streams, _sgi, \ | |
105 | BW2VBPS(_bw, 1053, 486, 234)), \ | |
106 | MCS_DURATION(_streams, _sgi, \ | |
107 | BW2VBPS(_bw, 1170, 540, 260)), \ | |
108 | MCS_DURATION(_streams, _sgi, \ | |
109 | BW2VBPS(_bw, 1404, 648, 312)), \ | |
110 | MCS_DURATION(_streams, _sgi, \ | |
111 | BW2VBPS(_bw, 1560, 720, 346)) \ | |
112 | } \ | |
113 | } | |
114 | ||
a0497f9f | 115 | #define CCK_DURATION(_bitrate, _short, _len) \ |
ed97a13c | 116 | (1000 * (10 /* SIFS */ + \ |
f359d3fe | 117 | (_short ? 72 + 24 : 144 + 48) + \ |
ed97a13c | 118 | (8 * (_len + 4) * 10) / (_bitrate))) |
a0497f9f FF |
119 | |
120 | #define CCK_ACK_DURATION(_bitrate, _short) \ | |
121 | (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \ | |
122 | CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE)) | |
123 | ||
124 | #define CCK_DURATION_LIST(_short) \ | |
125 | CCK_ACK_DURATION(10, _short), \ | |
126 | CCK_ACK_DURATION(20, _short), \ | |
127 | CCK_ACK_DURATION(55, _short), \ | |
128 | CCK_ACK_DURATION(110, _short) | |
129 | ||
8a0ee4fe KB |
130 | #define CCK_GROUP \ |
131 | [MINSTREL_CCK_GROUP] = { \ | |
132 | .streams = 0, \ | |
3ec373c4 | 133 | .flags = 0, \ |
8a0ee4fe KB |
134 | .duration = { \ |
135 | CCK_DURATION_LIST(false), \ | |
136 | CCK_DURATION_LIST(true) \ | |
137 | } \ | |
a0497f9f FF |
138 | } |
139 | ||
9208247d KB |
140 | #ifdef CONFIG_MAC80211_RC_MINSTREL_VHT |
141 | static bool minstrel_vht_only = true; | |
142 | module_param(minstrel_vht_only, bool, 0644); | |
143 | MODULE_PARM_DESC(minstrel_vht_only, | |
144 | "Use only VHT rates when VHT is supported by sta."); | |
145 | #endif | |
146 | ||
ec8aa669 FF |
147 | /* |
148 | * To enable sufficiently targeted rate sampling, MCS rates are divided into | |
149 | * groups, based on the number of streams and flags (HT40, SGI) that they | |
150 | * use. | |
a5f69d94 HS |
151 | * |
152 | * Sortorder has to be fixed for GROUP_IDX macro to be applicable: | |
8a0ee4fe | 153 | * BW -> SGI -> #streams |
ec8aa669 FF |
154 | */ |
155 | const struct mcs_group minstrel_mcs_groups[] = { | |
8a0ee4fe KB |
156 | MCS_GROUP(1, 0, BW_20), |
157 | MCS_GROUP(2, 0, BW_20), | |
8a0ee4fe | 158 | MCS_GROUP(3, 0, BW_20), |
ec8aa669 | 159 | |
8a0ee4fe KB |
160 | MCS_GROUP(1, 1, BW_20), |
161 | MCS_GROUP(2, 1, BW_20), | |
8a0ee4fe | 162 | MCS_GROUP(3, 1, BW_20), |
ec8aa669 | 163 | |
8a0ee4fe KB |
164 | MCS_GROUP(1, 0, BW_40), |
165 | MCS_GROUP(2, 0, BW_40), | |
8a0ee4fe | 166 | MCS_GROUP(3, 0, BW_40), |
ec8aa669 | 167 | |
8a0ee4fe KB |
168 | MCS_GROUP(1, 1, BW_40), |
169 | MCS_GROUP(2, 1, BW_40), | |
8a0ee4fe | 170 | MCS_GROUP(3, 1, BW_40), |
a0497f9f | 171 | |
9208247d KB |
172 | CCK_GROUP, |
173 | ||
174 | #ifdef CONFIG_MAC80211_RC_MINSTREL_VHT | |
175 | VHT_GROUP(1, 0, BW_20), | |
176 | VHT_GROUP(2, 0, BW_20), | |
9208247d | 177 | VHT_GROUP(3, 0, BW_20), |
9208247d KB |
178 | |
179 | VHT_GROUP(1, 1, BW_20), | |
180 | VHT_GROUP(2, 1, BW_20), | |
9208247d | 181 | VHT_GROUP(3, 1, BW_20), |
ec8aa669 | 182 | |
9208247d KB |
183 | VHT_GROUP(1, 0, BW_40), |
184 | VHT_GROUP(2, 0, BW_40), | |
9208247d | 185 | VHT_GROUP(3, 0, BW_40), |
9208247d KB |
186 | |
187 | VHT_GROUP(1, 1, BW_40), | |
188 | VHT_GROUP(2, 1, BW_40), | |
9208247d | 189 | VHT_GROUP(3, 1, BW_40), |
9208247d KB |
190 | |
191 | VHT_GROUP(1, 0, BW_80), | |
192 | VHT_GROUP(2, 0, BW_80), | |
9208247d | 193 | VHT_GROUP(3, 0, BW_80), |
9208247d KB |
194 | |
195 | VHT_GROUP(1, 1, BW_80), | |
196 | VHT_GROUP(2, 1, BW_80), | |
9208247d KB |
197 | VHT_GROUP(3, 1, BW_80), |
198 | #endif | |
9208247d | 199 | }; |
a0497f9f | 200 | |
f6e1a73b | 201 | static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly; |
ec8aa669 | 202 | |
a8566662 FF |
203 | static void |
204 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi); | |
205 | ||
9208247d KB |
206 | /* |
207 | * Some VHT MCSes are invalid (when Ndbps / Nes is not an integer) | |
208 | * e.g for MCS9@20MHzx1Nss: Ndbps=8x52*(5/6) Nes=1 | |
209 | * | |
210 | * Returns the valid mcs map for struct minstrel_mcs_group_data.supported | |
211 | */ | |
212 | static u16 | |
213 | minstrel_get_valid_vht_rates(int bw, int nss, __le16 mcs_map) | |
214 | { | |
215 | u16 mask = 0; | |
216 | ||
217 | if (bw == BW_20) { | |
218 | if (nss != 3 && nss != 6) | |
219 | mask = BIT(9); | |
220 | } else if (bw == BW_80) { | |
221 | if (nss == 3 || nss == 7) | |
222 | mask = BIT(6); | |
223 | else if (nss == 6) | |
224 | mask = BIT(9); | |
225 | } else { | |
226 | WARN_ON(bw != BW_40); | |
227 | } | |
228 | ||
229 | switch ((le16_to_cpu(mcs_map) >> (2 * (nss - 1))) & 3) { | |
230 | case IEEE80211_VHT_MCS_SUPPORT_0_7: | |
231 | mask |= 0x300; | |
232 | break; | |
233 | case IEEE80211_VHT_MCS_SUPPORT_0_8: | |
234 | mask |= 0x200; | |
235 | break; | |
236 | case IEEE80211_VHT_MCS_SUPPORT_0_9: | |
237 | break; | |
238 | default: | |
239 | mask = 0x3ff; | |
240 | } | |
241 | ||
242 | return 0x3ff & ~mask; | |
243 | } | |
244 | ||
ec8aa669 FF |
245 | /* |
246 | * Look up an MCS group index based on mac80211 rate information | |
247 | */ | |
248 | static int | |
249 | minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) | |
250 | { | |
cc61d8df | 251 | return GROUP_IDX((rate->idx / 8) + 1, |
a5f69d94 HS |
252 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
253 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); | |
ec8aa669 FF |
254 | } |
255 | ||
9208247d KB |
256 | static int |
257 | minstrel_vht_get_group_idx(struct ieee80211_tx_rate *rate) | |
258 | { | |
259 | return VHT_GROUP_IDX(ieee80211_rate_get_vht_nss(rate), | |
260 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), | |
261 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) + | |
262 | 2*!!(rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)); | |
263 | } | |
264 | ||
a0497f9f FF |
265 | static struct minstrel_rate_stats * |
266 | minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
267 | struct ieee80211_tx_rate *rate) | |
268 | { | |
269 | int group, idx; | |
270 | ||
271 | if (rate->flags & IEEE80211_TX_RC_MCS) { | |
272 | group = minstrel_ht_get_group_idx(rate); | |
7a5e3fa2 | 273 | idx = rate->idx % 8; |
9208247d KB |
274 | } else if (rate->flags & IEEE80211_TX_RC_VHT_MCS) { |
275 | group = minstrel_vht_get_group_idx(rate); | |
276 | idx = ieee80211_rate_get_vht_mcs(rate); | |
a0497f9f FF |
277 | } else { |
278 | group = MINSTREL_CCK_GROUP; | |
279 | ||
280 | for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) | |
281 | if (rate->idx == mp->cck_rates[idx]) | |
282 | break; | |
283 | ||
284 | /* short preamble */ | |
41d08583 | 285 | if (!(mi->supported[group] & BIT(idx))) |
a0497f9f FF |
286 | idx += 4; |
287 | } | |
288 | return &mi->groups[group].rates[idx]; | |
289 | } | |
290 | ||
ec8aa669 FF |
291 | static inline struct minstrel_rate_stats * |
292 | minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) | |
293 | { | |
294 | return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES]; | |
295 | } | |
296 | ||
ec8aa669 | 297 | /* |
6a27b2c4 TH |
298 | * Return current throughput based on the average A-MPDU length, taking into |
299 | * account the expected number of retransmissions and their expected length | |
ec8aa669 | 300 | */ |
6a27b2c4 | 301 | int |
50e55a8e TH |
302 | minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate, |
303 | int prob_ewma) | |
ec8aa669 | 304 | { |
ed97a13c | 305 | unsigned int nsecs = 0; |
ec8aa669 | 306 | |
9134073b | 307 | /* do not account throughput if sucess prob is below 10% */ |
50e55a8e | 308 | if (prob_ewma < MINSTREL_FRAC(10, 100)) |
6a27b2c4 | 309 | return 0; |
ec8aa669 | 310 | |
a0497f9f | 311 | if (group != MINSTREL_CCK_GROUP) |
ed97a13c | 312 | nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len); |
a0497f9f | 313 | |
ed97a13c | 314 | nsecs += minstrel_mcs_groups[group].duration[rate]; |
ed97a13c | 315 | |
50e55a8e TH |
316 | /* |
317 | * For the throughput calculation, limit the probability value to 90% to | |
318 | * account for collision related packet error rate fluctuation | |
319 | * (prob is scaled - see MINSTREL_FRAC above) | |
320 | */ | |
321 | if (prob_ewma > MINSTREL_FRAC(90, 100)) | |
322 | return MINSTREL_TRUNC(100000 * ((MINSTREL_FRAC(90, 100) * 1000) | |
323 | / nsecs)); | |
324 | else | |
325 | return MINSTREL_TRUNC(100000 * ((prob_ewma * 1000) / nsecs)); | |
ec8aa669 FF |
326 | } |
327 | ||
5935839a TH |
328 | /* |
329 | * Find & sort topmost throughput rates | |
330 | * | |
331 | * If multiple rates provide equal throughput the sorting is based on their | |
332 | * current success probability. Higher success probability is preferred among | |
333 | * MCS groups, CCK rates do not provide aggregation and are therefore at last. | |
334 | */ | |
335 | static void | |
d4d141ca KB |
336 | minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index, |
337 | u16 *tp_list) | |
5935839a | 338 | { |
6a27b2c4 TH |
339 | int cur_group, cur_idx, cur_tp_avg, cur_prob; |
340 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; | |
5935839a TH |
341 | int j = MAX_THR_RATES; |
342 | ||
343 | cur_group = index / MCS_GROUP_RATES; | |
344 | cur_idx = index % MCS_GROUP_RATES; | |
9134073b | 345 | cur_prob = mi->groups[cur_group].rates[cur_idx].prob_ewma; |
50e55a8e | 346 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, cur_prob); |
5935839a | 347 | |
280ba51d | 348 | do { |
5935839a TH |
349 | tmp_group = tp_list[j - 1] / MCS_GROUP_RATES; |
350 | tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES; | |
9134073b | 351 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
50e55a8e TH |
352 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, |
353 | tmp_prob); | |
6a27b2c4 TH |
354 | if (cur_tp_avg < tmp_tp_avg || |
355 | (cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob)) | |
280ba51d FF |
356 | break; |
357 | j--; | |
358 | } while (j > 0); | |
5935839a TH |
359 | |
360 | if (j < MAX_THR_RATES - 1) { | |
361 | memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) * | |
362 | (MAX_THR_RATES - (j + 1)))); | |
363 | } | |
364 | if (j < MAX_THR_RATES) | |
365 | tp_list[j] = index; | |
366 | } | |
367 | ||
368 | /* | |
369 | * Find and set the topmost probability rate per sta and per group | |
370 | */ | |
371 | static void | |
d4d141ca | 372 | minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 index) |
5935839a TH |
373 | { |
374 | struct minstrel_mcs_group_data *mg; | |
9134073b | 375 | struct minstrel_rate_stats *mrs; |
6a27b2c4 TH |
376 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
377 | int max_tp_group, cur_tp_avg, cur_group, cur_idx; | |
50e55a8e TH |
378 | int max_gpr_group, max_gpr_idx; |
379 | int max_gpr_tp_avg, max_gpr_prob; | |
5935839a | 380 | |
6a27b2c4 TH |
381 | cur_group = index / MCS_GROUP_RATES; |
382 | cur_idx = index % MCS_GROUP_RATES; | |
5935839a | 383 | mg = &mi->groups[index / MCS_GROUP_RATES]; |
9134073b | 384 | mrs = &mg->rates[index % MCS_GROUP_RATES]; |
5935839a TH |
385 | |
386 | tmp_group = mi->max_prob_rate / MCS_GROUP_RATES; | |
387 | tmp_idx = mi->max_prob_rate % MCS_GROUP_RATES; | |
9134073b | 388 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
50e55a8e | 389 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
5935839a TH |
390 | |
391 | /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from | |
392 | * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */ | |
393 | max_tp_group = mi->max_tp_rate[0] / MCS_GROUP_RATES; | |
394 | if((index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) && | |
395 | (max_tp_group != MINSTREL_CCK_GROUP)) | |
396 | return; | |
397 | ||
f84a9372 KK |
398 | max_gpr_group = mg->max_group_prob_rate / MCS_GROUP_RATES; |
399 | max_gpr_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; | |
400 | max_gpr_prob = mi->groups[max_gpr_group].rates[max_gpr_idx].prob_ewma; | |
401 | ||
9134073b | 402 | if (mrs->prob_ewma > MINSTREL_FRAC(75, 100)) { |
50e55a8e TH |
403 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, |
404 | mrs->prob_ewma); | |
6a27b2c4 | 405 | if (cur_tp_avg > tmp_tp_avg) |
5935839a | 406 | mi->max_prob_rate = index; |
6a27b2c4 | 407 | |
50e55a8e TH |
408 | max_gpr_tp_avg = minstrel_ht_get_tp_avg(mi, max_gpr_group, |
409 | max_gpr_idx, | |
410 | max_gpr_prob); | |
411 | if (cur_tp_avg > max_gpr_tp_avg) | |
5935839a TH |
412 | mg->max_group_prob_rate = index; |
413 | } else { | |
9134073b | 414 | if (mrs->prob_ewma > tmp_prob) |
5935839a | 415 | mi->max_prob_rate = index; |
f84a9372 | 416 | if (mrs->prob_ewma > max_gpr_prob) |
5935839a TH |
417 | mg->max_group_prob_rate = index; |
418 | } | |
419 | } | |
420 | ||
421 | ||
422 | /* | |
423 | * Assign new rate set per sta and use CCK rates only if the fastest | |
424 | * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted | |
425 | * rate sets where MCS and CCK rates are mixed, because CCK rates can | |
426 | * not use aggregation. | |
427 | */ | |
428 | static void | |
429 | minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi, | |
d4d141ca KB |
430 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], |
431 | u16 tmp_cck_tp_rate[MAX_THR_RATES]) | |
5935839a | 432 | { |
50e55a8e | 433 | unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob; |
5935839a TH |
434 | int i; |
435 | ||
436 | tmp_group = tmp_cck_tp_rate[0] / MCS_GROUP_RATES; | |
437 | tmp_idx = tmp_cck_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e TH |
438 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
439 | tmp_cck_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); | |
5935839a TH |
440 | |
441 | tmp_group = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES; | |
442 | tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e TH |
443 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
444 | tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); | |
5935839a TH |
445 | |
446 | if (tmp_cck_tp > tmp_mcs_tp) { | |
447 | for(i = 0; i < MAX_THR_RATES; i++) { | |
448 | minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i], | |
449 | tmp_mcs_tp_rate); | |
450 | } | |
451 | } | |
452 | ||
453 | } | |
454 | ||
455 | /* | |
456 | * Try to increase robustness of max_prob rate by decrease number of | |
457 | * streams if possible. | |
458 | */ | |
459 | static inline void | |
460 | minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi) | |
461 | { | |
462 | struct minstrel_mcs_group_data *mg; | |
50e55a8e | 463 | int tmp_max_streams, group, tmp_idx, tmp_prob; |
5935839a TH |
464 | int tmp_tp = 0; |
465 | ||
466 | tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / | |
467 | MCS_GROUP_RATES].streams; | |
468 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
469 | mg = &mi->groups[group]; | |
41d08583 | 470 | if (!mi->supported[group] || group == MINSTREL_CCK_GROUP) |
5935839a | 471 | continue; |
6a27b2c4 TH |
472 | |
473 | tmp_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; | |
50e55a8e | 474 | tmp_prob = mi->groups[group].rates[tmp_idx].prob_ewma; |
6a27b2c4 | 475 | |
50e55a8e | 476 | if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, tmp_idx, tmp_prob) && |
5935839a TH |
477 | (minstrel_mcs_groups[group].streams < tmp_max_streams)) { |
478 | mi->max_prob_rate = mg->max_group_prob_rate; | |
6a27b2c4 | 479 | tmp_tp = minstrel_ht_get_tp_avg(mi, group, |
50e55a8e TH |
480 | tmp_idx, |
481 | tmp_prob); | |
5935839a TH |
482 | } |
483 | } | |
484 | } | |
485 | ||
ec8aa669 FF |
486 | /* |
487 | * Update rate statistics and select new primary rates | |
488 | * | |
489 | * Rules for rate selection: | |
490 | * - max_prob_rate must use only one stream, as a tradeoff between delivery | |
491 | * probability and throughput during strong fluctuations | |
5935839a | 492 | * - as long as the max prob rate has a probability of more than 75%, pick |
ec8aa669 FF |
493 | * higher throughput rates, even if the probablity is a bit lower |
494 | */ | |
495 | static void | |
496 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
497 | { | |
498 | struct minstrel_mcs_group_data *mg; | |
9134073b | 499 | struct minstrel_rate_stats *mrs; |
50e55a8e | 500 | int group, i, j, cur_prob; |
d4d141ca KB |
501 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES]; |
502 | u16 tmp_cck_tp_rate[MAX_THR_RATES], index; | |
ec8aa669 FF |
503 | |
504 | if (mi->ampdu_packets > 0) { | |
505 | mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, | |
506 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL); | |
507 | mi->ampdu_len = 0; | |
508 | mi->ampdu_packets = 0; | |
509 | } | |
510 | ||
511 | mi->sample_slow = 0; | |
512 | mi->sample_count = 0; | |
ec8aa669 | 513 | |
5935839a TH |
514 | /* Initialize global rate indexes */ |
515 | for(j = 0; j < MAX_THR_RATES; j++){ | |
516 | tmp_mcs_tp_rate[j] = 0; | |
517 | tmp_cck_tp_rate[j] = 0; | |
518 | } | |
c2eb5b0f | 519 | |
5935839a TH |
520 | /* Find best rate sets within all MCS groups*/ |
521 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
ec8aa669 FF |
522 | |
523 | mg = &mi->groups[group]; | |
41d08583 | 524 | if (!mi->supported[group]) |
ec8aa669 FF |
525 | continue; |
526 | ||
ec8aa669 FF |
527 | mi->sample_count++; |
528 | ||
5935839a TH |
529 | /* (re)Initialize group rate indexes */ |
530 | for(j = 0; j < MAX_THR_RATES; j++) | |
531 | tmp_group_tp_rate[j] = group; | |
532 | ||
ec8aa669 | 533 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
41d08583 | 534 | if (!(mi->supported[group] & BIT(i))) |
ec8aa669 FF |
535 | continue; |
536 | ||
351df099 KB |
537 | index = MCS_GROUP_RATES * group + i; |
538 | ||
9134073b TH |
539 | mrs = &mg->rates[i]; |
540 | mrs->retry_updated = false; | |
541 | minstrel_calc_rate_stats(mrs); | |
50e55a8e | 542 | cur_prob = mrs->prob_ewma; |
ec8aa669 | 543 | |
50e55a8e | 544 | if (minstrel_ht_get_tp_avg(mi, group, i, cur_prob) == 0) |
ec8aa669 FF |
545 | continue; |
546 | ||
5935839a TH |
547 | /* Find max throughput rate set */ |
548 | if (group != MINSTREL_CCK_GROUP) { | |
549 | minstrel_ht_sort_best_tp_rates(mi, index, | |
550 | tmp_mcs_tp_rate); | |
551 | } else if (group == MINSTREL_CCK_GROUP) { | |
552 | minstrel_ht_sort_best_tp_rates(mi, index, | |
553 | tmp_cck_tp_rate); | |
ec8aa669 | 554 | } |
ec8aa669 | 555 | |
5935839a TH |
556 | /* Find max throughput rate set within a group */ |
557 | minstrel_ht_sort_best_tp_rates(mi, index, | |
558 | tmp_group_tp_rate); | |
ec8aa669 | 559 | |
5935839a TH |
560 | /* Find max probability rate per group and global */ |
561 | minstrel_ht_set_best_prob_rate(mi, index); | |
ec8aa669 FF |
562 | } |
563 | ||
5935839a TH |
564 | memcpy(mg->max_group_tp_rate, tmp_group_tp_rate, |
565 | sizeof(mg->max_group_tp_rate)); | |
ec8aa669 FF |
566 | } |
567 | ||
5935839a TH |
568 | /* Assign new rate set per sta */ |
569 | minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, tmp_cck_tp_rate); | |
570 | memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate)); | |
a299c6d5 | 571 | |
5935839a TH |
572 | /* Try to increase robustness of max_prob_rate*/ |
573 | minstrel_ht_prob_rate_reduce_streams(mi); | |
574 | ||
575 | /* try to sample all available rates during each interval */ | |
576 | mi->sample_count *= 8; | |
a299c6d5 | 577 | |
37feb7e2 LB |
578 | #ifdef CONFIG_MAC80211_DEBUGFS |
579 | /* use fixed index if set */ | |
580 | if (mp->fixed_rate_idx != -1) { | |
5935839a TH |
581 | for (i = 0; i < 4; i++) |
582 | mi->max_tp_rate[i] = mp->fixed_rate_idx; | |
37feb7e2 LB |
583 | mi->max_prob_rate = mp->fixed_rate_idx; |
584 | } | |
585 | #endif | |
a299c6d5 | 586 | |
5935839a | 587 | /* Reset update timer */ |
9134073b | 588 | mi->last_stats_update = jiffies; |
ec8aa669 FF |
589 | } |
590 | ||
591 | static bool | |
a0497f9f | 592 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
ec8aa669 | 593 | { |
b79296be | 594 | if (rate->idx < 0) |
ec8aa669 FF |
595 | return false; |
596 | ||
b79296be | 597 | if (!rate->count) |
ec8aa669 FF |
598 | return false; |
599 | ||
9208247d KB |
600 | if (rate->flags & IEEE80211_TX_RC_MCS || |
601 | rate->flags & IEEE80211_TX_RC_VHT_MCS) | |
a0497f9f FF |
602 | return true; |
603 | ||
604 | return rate->idx == mp->cck_rates[0] || | |
605 | rate->idx == mp->cck_rates[1] || | |
606 | rate->idx == mp->cck_rates[2] || | |
607 | rate->idx == mp->cck_rates[3]; | |
ec8aa669 FF |
608 | } |
609 | ||
610 | static void | |
9134073b | 611 | minstrel_set_next_sample_idx(struct minstrel_ht_sta *mi) |
ec8aa669 FF |
612 | { |
613 | struct minstrel_mcs_group_data *mg; | |
614 | ||
615 | for (;;) { | |
616 | mi->sample_group++; | |
617 | mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); | |
618 | mg = &mi->groups[mi->sample_group]; | |
619 | ||
41d08583 | 620 | if (!mi->supported[mi->sample_group]) |
ec8aa669 FF |
621 | continue; |
622 | ||
623 | if (++mg->index >= MCS_GROUP_RATES) { | |
624 | mg->index = 0; | |
625 | if (++mg->column >= ARRAY_SIZE(sample_table)) | |
626 | mg->column = 0; | |
627 | } | |
628 | break; | |
629 | } | |
630 | } | |
631 | ||
632 | static void | |
d4d141ca | 633 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u16 *idx, bool primary) |
ec8aa669 FF |
634 | { |
635 | int group, orig_group; | |
636 | ||
637 | orig_group = group = *idx / MCS_GROUP_RATES; | |
638 | while (group > 0) { | |
639 | group--; | |
640 | ||
41d08583 | 641 | if (!mi->supported[group]) |
ec8aa669 FF |
642 | continue; |
643 | ||
644 | if (minstrel_mcs_groups[group].streams > | |
645 | minstrel_mcs_groups[orig_group].streams) | |
646 | continue; | |
647 | ||
648 | if (primary) | |
5935839a | 649 | *idx = mi->groups[group].max_group_tp_rate[0]; |
ec8aa669 | 650 | else |
5935839a | 651 | *idx = mi->groups[group].max_group_tp_rate[1]; |
ec8aa669 FF |
652 | break; |
653 | } | |
654 | } | |
655 | ||
656 | static void | |
6048d763 | 657 | minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
ec8aa669 FF |
658 | { |
659 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
660 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
661 | u16 tid; | |
662 | ||
75769c80 FF |
663 | if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
664 | return; | |
665 | ||
ec8aa669 FF |
666 | if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) |
667 | return; | |
668 | ||
e133fae2 | 669 | if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) |
ec8aa669 FF |
670 | return; |
671 | ||
a1f2ba04 | 672 | tid = ieee80211_get_tid(hdr); |
a622ab72 | 673 | if (likely(sta->ampdu_mlme.tid_tx[tid])) |
ec8aa669 FF |
674 | return; |
675 | ||
7a36b930 | 676 | ieee80211_start_tx_ba_session(pubsta, tid, 0); |
ec8aa669 FF |
677 | } |
678 | ||
679 | static void | |
680 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, | |
18fb84d9 | 681 | void *priv_sta, struct ieee80211_tx_status *st) |
ec8aa669 | 682 | { |
18fb84d9 | 683 | struct ieee80211_tx_info *info = st->info; |
ec8aa669 FF |
684 | struct minstrel_ht_sta_priv *msp = priv_sta; |
685 | struct minstrel_ht_sta *mi = &msp->ht; | |
ec8aa669 FF |
686 | struct ieee80211_tx_rate *ar = info->status.rates; |
687 | struct minstrel_rate_stats *rate, *rate2; | |
688 | struct minstrel_priv *mp = priv; | |
a8566662 | 689 | bool last, update = false; |
a544ab7f | 690 | int i; |
ec8aa669 FF |
691 | |
692 | if (!msp->is_ht) | |
18fb84d9 FF |
693 | return mac80211_minstrel.tx_status_ext(priv, sband, |
694 | &msp->legacy, st); | |
ec8aa669 FF |
695 | |
696 | /* This packet was aggregated but doesn't carry status info */ | |
697 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
698 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
699 | return; | |
700 | ||
15d46f38 BS |
701 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
702 | info->status.ampdu_ack_len = | |
703 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); | |
ec8aa669 FF |
704 | info->status.ampdu_len = 1; |
705 | } | |
706 | ||
707 | mi->ampdu_packets++; | |
708 | mi->ampdu_len += info->status.ampdu_len; | |
709 | ||
710 | if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { | |
c7317e41 | 711 | mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len); |
52c00a37 | 712 | mi->sample_tries = 1; |
ec8aa669 FF |
713 | mi->sample_count--; |
714 | } | |
715 | ||
8d5eab5a | 716 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
ec8aa669 | 717 | mi->sample_packets += info->status.ampdu_len; |
ec8aa669 | 718 | |
a0497f9f | 719 | last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
ec8aa669 FF |
720 | for (i = 0; !last; i++) { |
721 | last = (i == IEEE80211_TX_MAX_RATES - 1) || | |
a0497f9f | 722 | !minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
ec8aa669 | 723 | |
a0497f9f | 724 | rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
ec8aa669 | 725 | |
15d46f38 | 726 | if (last) |
ec8aa669 FF |
727 | rate->success += info->status.ampdu_ack_len; |
728 | ||
729 | rate->attempts += ar[i].count * info->status.ampdu_len; | |
730 | } | |
731 | ||
732 | /* | |
733 | * check for sudden death of spatial multiplexing, | |
734 | * downgrade to a lower number of streams if necessary. | |
735 | */ | |
5935839a | 736 | rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]); |
ec8aa669 FF |
737 | if (rate->attempts > 30 && |
738 | MINSTREL_FRAC(rate->success, rate->attempts) < | |
a8566662 | 739 | MINSTREL_FRAC(20, 100)) { |
5935839a | 740 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true); |
a8566662 FF |
741 | update = true; |
742 | } | |
ec8aa669 | 743 | |
5935839a | 744 | rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]); |
ecc3d5ae ML |
745 | if (rate2->attempts > 30 && |
746 | MINSTREL_FRAC(rate2->success, rate2->attempts) < | |
a8566662 | 747 | MINSTREL_FRAC(20, 100)) { |
5935839a | 748 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false); |
a8566662 FF |
749 | update = true; |
750 | } | |
ec8aa669 | 751 | |
9134073b TH |
752 | if (time_after(jiffies, mi->last_stats_update + |
753 | (mp->update_interval / 2 * HZ) / 1000)) { | |
a8566662 | 754 | update = true; |
ec8aa669 | 755 | minstrel_ht_update_stats(mp, mi); |
ec8aa669 | 756 | } |
a8566662 FF |
757 | |
758 | if (update) | |
759 | minstrel_ht_update_rates(mp, mi); | |
ec8aa669 FF |
760 | } |
761 | ||
762 | static void | |
763 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
764 | int index) | |
765 | { | |
9134073b | 766 | struct minstrel_rate_stats *mrs; |
ec8aa669 FF |
767 | const struct mcs_group *group; |
768 | unsigned int tx_time, tx_time_rtscts, tx_time_data; | |
769 | unsigned int cw = mp->cw_min; | |
8fddddff | 770 | unsigned int ctime = 0; |
ec8aa669 FF |
771 | unsigned int t_slot = 9; /* FIXME */ |
772 | unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); | |
a0497f9f | 773 | unsigned int overhead = 0, overhead_rtscts = 0; |
ec8aa669 | 774 | |
9134073b TH |
775 | mrs = minstrel_get_ratestats(mi, index); |
776 | if (mrs->prob_ewma < MINSTREL_FRAC(1, 10)) { | |
777 | mrs->retry_count = 1; | |
778 | mrs->retry_count_rtscts = 1; | |
ec8aa669 FF |
779 | return; |
780 | } | |
781 | ||
9134073b TH |
782 | mrs->retry_count = 2; |
783 | mrs->retry_count_rtscts = 2; | |
784 | mrs->retry_updated = true; | |
ec8aa669 FF |
785 | |
786 | group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
ed97a13c | 787 | tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000; |
8fddddff DH |
788 | |
789 | /* Contention time for first 2 tries */ | |
790 | ctime = (t_slot * cw) >> 1; | |
791 | cw = min((cw << 1) | 1, mp->cw_max); | |
792 | ctime += (t_slot * cw) >> 1; | |
793 | cw = min((cw << 1) | 1, mp->cw_max); | |
794 | ||
a0497f9f FF |
795 | if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { |
796 | overhead = mi->overhead; | |
797 | overhead_rtscts = mi->overhead_rtscts; | |
798 | } | |
799 | ||
8fddddff | 800 | /* Total TX time for data and Contention after first 2 tries */ |
a0497f9f FF |
801 | tx_time = ctime + 2 * (overhead + tx_time_data); |
802 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); | |
8fddddff DH |
803 | |
804 | /* See how many more tries we can fit inside segment size */ | |
ec8aa669 | 805 | do { |
8fddddff DH |
806 | /* Contention time for this try */ |
807 | ctime = (t_slot * cw) >> 1; | |
808 | cw = min((cw << 1) | 1, mp->cw_max); | |
809 | ||
810 | /* Total TX time after this try */ | |
a0497f9f FF |
811 | tx_time += ctime + overhead + tx_time_data; |
812 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; | |
8fddddff | 813 | |
ec8aa669 | 814 | if (tx_time_rtscts < mp->segment_size) |
9134073b | 815 | mrs->retry_count_rtscts++; |
ec8aa669 | 816 | } while ((tx_time < mp->segment_size) && |
9134073b | 817 | (++mrs->retry_count < mp->max_retry)); |
ec8aa669 FF |
818 | } |
819 | ||
820 | ||
821 | static void | |
822 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
a8566662 | 823 | struct ieee80211_sta_rates *ratetbl, int offset, int index) |
ec8aa669 FF |
824 | { |
825 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
9134073b | 826 | struct minstrel_rate_stats *mrs; |
a8566662 | 827 | u8 idx; |
3ec373c4 | 828 | u16 flags = group->flags; |
ec8aa669 | 829 | |
9134073b TH |
830 | mrs = minstrel_get_ratestats(mi, index); |
831 | if (!mrs->retry_updated) | |
ec8aa669 FF |
832 | minstrel_calc_retransmit(mp, mi, index); |
833 | ||
9134073b | 834 | if (mrs->prob_ewma < MINSTREL_FRAC(20, 100) || !mrs->retry_count) { |
a8566662 FF |
835 | ratetbl->rate[offset].count = 2; |
836 | ratetbl->rate[offset].count_rts = 2; | |
837 | ratetbl->rate[offset].count_cts = 2; | |
838 | } else { | |
9134073b TH |
839 | ratetbl->rate[offset].count = mrs->retry_count; |
840 | ratetbl->rate[offset].count_cts = mrs->retry_count; | |
841 | ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts; | |
a8566662 | 842 | } |
a0497f9f | 843 | |
3ec373c4 | 844 | if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) |
a8566662 | 845 | idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
9208247d KB |
846 | else if (flags & IEEE80211_TX_RC_VHT_MCS) |
847 | idx = ((group->streams - 1) << 4) | | |
848 | ((index % MCS_GROUP_RATES) & 0xF); | |
3ec373c4 | 849 | else |
7a5e3fa2 | 850 | idx = index % MCS_GROUP_RATES + (group->streams - 1) * 8; |
a8566662 | 851 | |
a3ebb4e1 KC |
852 | /* enable RTS/CTS if needed: |
853 | * - if station is in dynamic SMPS (and streams > 1) | |
854 | * - for fallback rates, to increase chances of getting through | |
855 | */ | |
c36dd3ea | 856 | if (offset > 0 || |
a3ebb4e1 KC |
857 | (mi->sta->smps_mode == IEEE80211_SMPS_DYNAMIC && |
858 | group->streams > 1)) { | |
a8566662 FF |
859 | ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; |
860 | flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
861 | } | |
862 | ||
863 | ratetbl->rate[offset].idx = idx; | |
864 | ratetbl->rate[offset].flags = flags; | |
865 | } | |
866 | ||
918fe04b FF |
867 | static inline int |
868 | minstrel_ht_get_prob_ewma(struct minstrel_ht_sta *mi, int rate) | |
869 | { | |
870 | int group = rate / MCS_GROUP_RATES; | |
871 | rate %= MCS_GROUP_RATES; | |
872 | return mi->groups[group].rates[rate].prob_ewma; | |
873 | } | |
874 | ||
875 | static int | |
876 | minstrel_ht_get_max_amsdu_len(struct minstrel_ht_sta *mi) | |
877 | { | |
878 | int group = mi->max_prob_rate / MCS_GROUP_RATES; | |
879 | const struct mcs_group *g = &minstrel_mcs_groups[group]; | |
880 | int rate = mi->max_prob_rate % MCS_GROUP_RATES; | |
881 | ||
882 | /* Disable A-MSDU if max_prob_rate is bad */ | |
883 | if (mi->groups[group].rates[rate].prob_ewma < MINSTREL_FRAC(50, 100)) | |
884 | return 1; | |
885 | ||
886 | /* If the rate is slower than single-stream MCS1, make A-MSDU limit small */ | |
887 | if (g->duration[rate] > MCS_DURATION(1, 0, 52)) | |
888 | return 500; | |
889 | ||
890 | /* | |
891 | * If the rate is slower than single-stream MCS4, limit A-MSDU to usual | |
892 | * data packet size | |
893 | */ | |
894 | if (g->duration[rate] > MCS_DURATION(1, 0, 104)) | |
895 | return 1600; | |
896 | ||
897 | /* | |
898 | * If the rate is slower than single-stream MCS7, or if the max throughput | |
899 | * rate success probability is less than 75%, limit A-MSDU to twice the usual | |
900 | * data packet size | |
901 | */ | |
902 | if (g->duration[rate] > MCS_DURATION(1, 0, 260) || | |
903 | (minstrel_ht_get_prob_ewma(mi, mi->max_tp_rate[0]) < | |
904 | MINSTREL_FRAC(75, 100))) | |
905 | return 3200; | |
906 | ||
907 | /* | |
908 | * HT A-MPDU limits maximum MPDU size under BA agreement to 4095 bytes. | |
909 | * Since aggregation sessions are started/stopped without txq flush, use | |
910 | * the limit here to avoid the complexity of having to de-aggregate | |
911 | * packets in the queue. | |
912 | */ | |
913 | if (!mi->sta->vht_cap.vht_supported) | |
914 | return IEEE80211_MAX_MPDU_LEN_HT_BA; | |
915 | ||
916 | /* unlimited */ | |
917 | return 0; | |
918 | } | |
919 | ||
a8566662 FF |
920 | static void |
921 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
922 | { | |
923 | struct ieee80211_sta_rates *rates; | |
924 | int i = 0; | |
925 | ||
926 | rates = kzalloc(sizeof(*rates), GFP_ATOMIC); | |
927 | if (!rates) | |
a0497f9f | 928 | return; |
a8566662 | 929 | |
5935839a TH |
930 | /* Start with max_tp_rate[0] */ |
931 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]); | |
a8566662 FF |
932 | |
933 | if (mp->hw->max_rates >= 3) { | |
5935839a TH |
934 | /* At least 3 tx rates supported, use max_tp_rate[1] next */ |
935 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]); | |
a8566662 FF |
936 | } |
937 | ||
938 | if (mp->hw->max_rates >= 2) { | |
939 | /* | |
940 | * At least 2 tx rates supported, use max_prob_rate next */ | |
941 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); | |
a0497f9f FF |
942 | } |
943 | ||
918fe04b | 944 | mi->sta->max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi); |
a8566662 FF |
945 | rates->rate[i].idx = -1; |
946 | rate_control_set_rates(mp->hw, mi->sta, rates); | |
ec8aa669 FF |
947 | } |
948 | ||
949 | static inline int | |
950 | minstrel_get_duration(int index) | |
951 | { | |
952 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
953 | return group->duration[index % MCS_GROUP_RATES]; | |
954 | } | |
955 | ||
956 | static int | |
957 | minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
958 | { | |
9134073b | 959 | struct minstrel_rate_stats *mrs; |
ec8aa669 | 960 | struct minstrel_mcs_group_data *mg; |
5935839a | 961 | unsigned int sample_dur, sample_group, cur_max_tp_streams; |
06171e9c | 962 | int tp_rate1, tp_rate2; |
ec8aa669 FF |
963 | int sample_idx = 0; |
964 | ||
965 | if (mi->sample_wait > 0) { | |
966 | mi->sample_wait--; | |
967 | return -1; | |
968 | } | |
969 | ||
970 | if (!mi->sample_tries) | |
971 | return -1; | |
972 | ||
f12140c0 KB |
973 | sample_group = mi->sample_group; |
974 | mg = &mi->groups[sample_group]; | |
ec8aa669 | 975 | sample_idx = sample_table[mg->column][mg->index]; |
9134073b | 976 | minstrel_set_next_sample_idx(mi); |
f12140c0 | 977 | |
41d08583 | 978 | if (!(mi->supported[sample_group] & BIT(sample_idx))) |
f12140c0 KB |
979 | return -1; |
980 | ||
9134073b | 981 | mrs = &mg->rates[sample_idx]; |
965237ab | 982 | sample_idx += sample_group * MCS_GROUP_RATES; |
ec8aa669 | 983 | |
06171e9c FF |
984 | /* Set tp_rate1, tp_rate2 to the highest / second highest max_tp_rate */ |
985 | if (minstrel_get_duration(mi->max_tp_rate[0]) > | |
986 | minstrel_get_duration(mi->max_tp_rate[1])) { | |
987 | tp_rate1 = mi->max_tp_rate[1]; | |
988 | tp_rate2 = mi->max_tp_rate[0]; | |
989 | } else { | |
990 | tp_rate1 = mi->max_tp_rate[0]; | |
991 | tp_rate2 = mi->max_tp_rate[1]; | |
992 | } | |
993 | ||
ba6fa29c HS |
994 | /* |
995 | * Sampling might add some overhead (RTS, no aggregation) | |
06171e9c FF |
996 | * to the frame. Hence, don't use sampling for the highest currently |
997 | * used highest throughput or probability rate. | |
ba6fa29c | 998 | */ |
06171e9c | 999 | if (sample_idx == mi->max_tp_rate[0] || sample_idx == mi->max_prob_rate) |
ba6fa29c | 1000 | return -1; |
a0ca796c | 1001 | |
ec8aa669 | 1002 | /* |
bc96f242 FF |
1003 | * Do not sample if the probability is already higher than 95% |
1004 | * to avoid wasting airtime. | |
ec8aa669 | 1005 | */ |
9134073b | 1006 | if (mrs->prob_ewma > MINSTREL_FRAC(95, 100)) |
8d5eab5a | 1007 | return -1; |
ec8aa669 FF |
1008 | |
1009 | /* | |
1010 | * Make sure that lower rates get sampled only occasionally, | |
1011 | * if the link is working perfectly. | |
1012 | */ | |
5935839a | 1013 | |
06171e9c | 1014 | cur_max_tp_streams = minstrel_mcs_groups[tp_rate1 / |
5935839a | 1015 | MCS_GROUP_RATES].streams; |
965237ab | 1016 | sample_dur = minstrel_get_duration(sample_idx); |
06171e9c | 1017 | if (sample_dur >= minstrel_get_duration(tp_rate2) && |
5935839a | 1018 | (cur_max_tp_streams - 1 < |
965237ab FF |
1019 | minstrel_mcs_groups[sample_group].streams || |
1020 | sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { | |
9134073b | 1021 | if (mrs->sample_skipped < 20) |
8d5eab5a | 1022 | return -1; |
ec8aa669 FF |
1023 | |
1024 | if (mi->sample_slow++ > 2) | |
8d5eab5a | 1025 | return -1; |
ec8aa669 | 1026 | } |
098b8afb | 1027 | mi->sample_tries--; |
ec8aa669 FF |
1028 | |
1029 | return sample_idx; | |
ec8aa669 FF |
1030 | } |
1031 | ||
1032 | static void | |
1033 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, | |
1034 | struct ieee80211_tx_rate_control *txrc) | |
1035 | { | |
a8566662 | 1036 | const struct mcs_group *sample_group; |
ec8aa669 | 1037 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
a8566662 | 1038 | struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
ec8aa669 FF |
1039 | struct minstrel_ht_sta_priv *msp = priv_sta; |
1040 | struct minstrel_ht_sta *mi = &msp->ht; | |
1041 | struct minstrel_priv *mp = priv; | |
1042 | int sample_idx; | |
1043 | ||
1044 | if (rate_control_send_low(sta, priv_sta, txrc)) | |
1045 | return; | |
1046 | ||
1047 | if (!msp->is_ht) | |
1048 | return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); | |
1049 | ||
95943425 FF |
1050 | if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
1051 | mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) | |
1052 | minstrel_aggr_check(sta, txrc->skb); | |
1053 | ||
ec8aa669 | 1054 | info->flags |= mi->tx_flags; |
6de062ce | 1055 | |
37feb7e2 LB |
1056 | #ifdef CONFIG_MAC80211_DEBUGFS |
1057 | if (mp->fixed_rate_idx != -1) | |
1058 | return; | |
1059 | #endif | |
1060 | ||
6de062ce HS |
1061 | /* Don't use EAPOL frames for sampling on non-mrr hw */ |
1062 | if (mp->hw->max_rates == 1 && | |
af61a165 | 1063 | (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
6de062ce HS |
1064 | sample_idx = -1; |
1065 | else | |
1066 | sample_idx = minstrel_get_sample_rate(mp, mi); | |
24f7580e | 1067 | |
ec8aa669 FF |
1068 | mi->total_packets++; |
1069 | ||
1070 | /* wraparound */ | |
1071 | if (mi->total_packets == ~0) { | |
1072 | mi->total_packets = 0; | |
1073 | mi->sample_packets = 0; | |
1074 | } | |
a8566662 FF |
1075 | |
1076 | if (sample_idx < 0) | |
1077 | return; | |
1078 | ||
1079 | sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; | |
1080 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
1cd15857 FF |
1081 | rate->count = 1; |
1082 | ||
1083 | if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { | |
1084 | int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); | |
1085 | rate->idx = mp->cck_rates[idx]; | |
9208247d KB |
1086 | } else if (sample_group->flags & IEEE80211_TX_RC_VHT_MCS) { |
1087 | ieee80211_rate_set_vht(rate, sample_idx % MCS_GROUP_RATES, | |
1088 | sample_group->streams); | |
3ec373c4 KB |
1089 | } else { |
1090 | rate->idx = sample_idx % MCS_GROUP_RATES + | |
1091 | (sample_group->streams - 1) * 8; | |
1cd15857 FF |
1092 | } |
1093 | ||
3ec373c4 | 1094 | rate->flags = sample_group->flags; |
ec8aa669 FF |
1095 | } |
1096 | ||
a0497f9f FF |
1097 | static void |
1098 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
1099 | struct ieee80211_supported_band *sband, | |
1100 | struct ieee80211_sta *sta) | |
1101 | { | |
1102 | int i; | |
1103 | ||
57fbcce3 | 1104 | if (sband->band != NL80211_BAND_2GHZ) |
a0497f9f FF |
1105 | return; |
1106 | ||
30686bf7 | 1107 | if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES)) |
2dfca312 FF |
1108 | return; |
1109 | ||
a0497f9f FF |
1110 | mi->cck_supported = 0; |
1111 | mi->cck_supported_short = 0; | |
1112 | for (i = 0; i < 4; i++) { | |
1113 | if (!rate_supported(sta, sband->band, mp->cck_rates[i])) | |
1114 | continue; | |
1115 | ||
1116 | mi->cck_supported |= BIT(i); | |
1117 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1118 | mi->cck_supported_short |= BIT(i); | |
1119 | } | |
1120 | ||
41d08583 | 1121 | mi->supported[MINSTREL_CCK_GROUP] = mi->cck_supported; |
a0497f9f FF |
1122 | } |
1123 | ||
ec8aa669 FF |
1124 | static void |
1125 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1126 | struct cfg80211_chan_def *chandef, |
64f68e5d | 1127 | struct ieee80211_sta *sta, void *priv_sta) |
ec8aa669 FF |
1128 | { |
1129 | struct minstrel_priv *mp = priv; | |
1130 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1131 | struct minstrel_ht_sta *mi = &msp->ht; | |
1132 | struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; | |
ec8aa669 | 1133 | u16 sta_cap = sta->ht_cap.cap; |
9208247d | 1134 | struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; |
782dda00 | 1135 | struct sta_info *sinfo = container_of(sta, struct sta_info, sta); |
9208247d | 1136 | int use_vht; |
4dc217df | 1137 | int n_supported = 0; |
ec8aa669 FF |
1138 | int ack_dur; |
1139 | int stbc; | |
1140 | int i; | |
1141 | ||
1142 | /* fall back to the old minstrel for legacy stations */ | |
4dc217df FF |
1143 | if (!sta->ht_cap.ht_supported) |
1144 | goto use_legacy; | |
ec8aa669 | 1145 | |
8a0ee4fe | 1146 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB); |
ec8aa669 | 1147 | |
9208247d KB |
1148 | #ifdef CONFIG_MAC80211_RC_MINSTREL_VHT |
1149 | if (vht_cap->vht_supported) | |
1150 | use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0); | |
1151 | else | |
1152 | #endif | |
1153 | use_vht = 0; | |
1154 | ||
ec8aa669 FF |
1155 | msp->is_ht = true; |
1156 | memset(mi, 0, sizeof(*mi)); | |
a8566662 FF |
1157 | |
1158 | mi->sta = sta; | |
9134073b | 1159 | mi->last_stats_update = jiffies; |
ec8aa669 | 1160 | |
438b61b7 SW |
1161 | ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); |
1162 | mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); | |
1163 | mi->overhead += ack_dur; | |
ec8aa669 FF |
1164 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
1165 | ||
1166 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); | |
1167 | ||
1168 | /* When using MRR, sample more on the first attempt, without delay */ | |
1169 | if (mp->has_mrr) { | |
1170 | mi->sample_count = 16; | |
1171 | mi->sample_wait = 0; | |
1172 | } else { | |
1173 | mi->sample_count = 8; | |
1174 | mi->sample_wait = 8; | |
1175 | } | |
1176 | mi->sample_tries = 4; | |
1177 | ||
9208247d KB |
1178 | /* TODO tx_flags for vht - ATM the RC API is not fine-grained enough */ |
1179 | if (!use_vht) { | |
1180 | stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >> | |
1181 | IEEE80211_HT_CAP_RX_STBC_SHIFT; | |
1182 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; | |
ec8aa669 | 1183 | |
9208247d KB |
1184 | if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) |
1185 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; | |
1186 | } | |
ec8aa669 | 1187 | |
ec8aa669 | 1188 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
3ec373c4 | 1189 | u32 gflags = minstrel_mcs_groups[i].flags; |
9208247d | 1190 | int bw, nss; |
3ec373c4 | 1191 | |
41d08583 | 1192 | mi->supported[i] = 0; |
a0497f9f FF |
1193 | if (i == MINSTREL_CCK_GROUP) { |
1194 | minstrel_ht_update_cck(mp, mi, sband, sta); | |
1195 | continue; | |
1196 | } | |
1197 | ||
3ec373c4 KB |
1198 | if (gflags & IEEE80211_TX_RC_SHORT_GI) { |
1199 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) { | |
e1a0c6b3 JB |
1200 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_40)) |
1201 | continue; | |
1202 | } else { | |
1203 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_20)) | |
1204 | continue; | |
1205 | } | |
ec8aa669 FF |
1206 | } |
1207 | ||
3ec373c4 | 1208 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
e1a0c6b3 | 1209 | sta->bandwidth < IEEE80211_STA_RX_BW_40) |
ec8aa669 FF |
1210 | continue; |
1211 | ||
9208247d KB |
1212 | nss = minstrel_mcs_groups[i].streams; |
1213 | ||
e9219779 | 1214 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
9208247d KB |
1215 | if (sta->smps_mode == IEEE80211_SMPS_STATIC && nss > 1) |
1216 | continue; | |
1217 | ||
1218 | /* HT rate */ | |
1219 | if (gflags & IEEE80211_TX_RC_MCS) { | |
1220 | #ifdef CONFIG_MAC80211_RC_MINSTREL_VHT | |
9ffe9044 | 1221 | if (use_vht && minstrel_vht_only) |
9208247d KB |
1222 | continue; |
1223 | #endif | |
41d08583 FF |
1224 | mi->supported[i] = mcs->rx_mask[nss - 1]; |
1225 | if (mi->supported[i]) | |
9208247d KB |
1226 | n_supported++; |
1227 | continue; | |
1228 | } | |
1229 | ||
1230 | /* VHT rate */ | |
1231 | if (!vht_cap->vht_supported || | |
1232 | WARN_ON(!(gflags & IEEE80211_TX_RC_VHT_MCS)) || | |
1233 | WARN_ON(gflags & IEEE80211_TX_RC_160_MHZ_WIDTH)) | |
e9219779 HS |
1234 | continue; |
1235 | ||
9208247d KB |
1236 | if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) { |
1237 | if (sta->bandwidth < IEEE80211_STA_RX_BW_80 || | |
1238 | ((gflags & IEEE80211_TX_RC_SHORT_GI) && | |
1239 | !(vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80))) { | |
1240 | continue; | |
1241 | } | |
1242 | } | |
1243 | ||
1244 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) | |
1245 | bw = BW_40; | |
1246 | else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) | |
1247 | bw = BW_80; | |
1248 | else | |
1249 | bw = BW_20; | |
1250 | ||
41d08583 | 1251 | mi->supported[i] = minstrel_get_valid_vht_rates(bw, nss, |
9208247d | 1252 | vht_cap->vht_mcs.tx_mcs_map); |
4dc217df | 1253 | |
41d08583 | 1254 | if (mi->supported[i]) |
4dc217df | 1255 | n_supported++; |
ec8aa669 | 1256 | } |
4dc217df FF |
1257 | |
1258 | if (!n_supported) | |
1259 | goto use_legacy; | |
1260 | ||
782dda00 FF |
1261 | if (test_sta_flag(sinfo, WLAN_STA_SHORT_PREAMBLE)) |
1262 | mi->cck_supported_short |= mi->cck_supported_short << 4; | |
1263 | ||
a8566662 | 1264 | /* create an initial rate table with the lowest supported rates */ |
a3647362 | 1265 | minstrel_ht_update_stats(mp, mi); |
a8566662 | 1266 | minstrel_ht_update_rates(mp, mi); |
a3647362 | 1267 | |
4dc217df FF |
1268 | return; |
1269 | ||
1270 | use_legacy: | |
1271 | msp->is_ht = false; | |
1272 | memset(&msp->legacy, 0, sizeof(msp->legacy)); | |
1273 | msp->legacy.r = msp->ratelist; | |
1274 | msp->legacy.sample_table = msp->sample_table; | |
3de805cf SW |
1275 | return mac80211_minstrel.rate_init(priv, sband, chandef, sta, |
1276 | &msp->legacy); | |
ec8aa669 FF |
1277 | } |
1278 | ||
1279 | static void | |
1280 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1281 | struct cfg80211_chan_def *chandef, |
ec8aa669 FF |
1282 | struct ieee80211_sta *sta, void *priv_sta) |
1283 | { | |
3de805cf | 1284 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1285 | } |
1286 | ||
1287 | static void | |
1288 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1289 | struct cfg80211_chan_def *chandef, |
ec8aa669 | 1290 | struct ieee80211_sta *sta, void *priv_sta, |
64f68e5d | 1291 | u32 changed) |
ec8aa669 | 1292 | { |
3de805cf | 1293 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1294 | } |
1295 | ||
1296 | static void * | |
1297 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) | |
1298 | { | |
1299 | struct ieee80211_supported_band *sband; | |
1300 | struct minstrel_ht_sta_priv *msp; | |
1301 | struct minstrel_priv *mp = priv; | |
1302 | struct ieee80211_hw *hw = mp->hw; | |
1303 | int max_rates = 0; | |
1304 | int i; | |
1305 | ||
57fbcce3 | 1306 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
ec8aa669 FF |
1307 | sband = hw->wiphy->bands[i]; |
1308 | if (sband && sband->n_bitrates > max_rates) | |
1309 | max_rates = sband->n_bitrates; | |
1310 | } | |
1311 | ||
472dd35c | 1312 | msp = kzalloc(sizeof(*msp), gfp); |
ec8aa669 FF |
1313 | if (!msp) |
1314 | return NULL; | |
1315 | ||
1316 | msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); | |
1317 | if (!msp->ratelist) | |
1318 | goto error; | |
1319 | ||
6da2ec56 | 1320 | msp->sample_table = kmalloc_array(max_rates, SAMPLE_COLUMNS, gfp); |
ec8aa669 FF |
1321 | if (!msp->sample_table) |
1322 | goto error1; | |
1323 | ||
1324 | return msp; | |
1325 | ||
1326 | error1: | |
7e988014 | 1327 | kfree(msp->ratelist); |
ec8aa669 FF |
1328 | error: |
1329 | kfree(msp); | |
1330 | return NULL; | |
1331 | } | |
1332 | ||
1333 | static void | |
1334 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) | |
1335 | { | |
1336 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1337 | ||
1338 | kfree(msp->sample_table); | |
1339 | kfree(msp->ratelist); | |
1340 | kfree(msp); | |
1341 | } | |
1342 | ||
1343 | static void * | |
1344 | minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
1345 | { | |
1346 | return mac80211_minstrel.alloc(hw, debugfsdir); | |
1347 | } | |
1348 | ||
1349 | static void | |
1350 | minstrel_ht_free(void *priv) | |
1351 | { | |
1352 | mac80211_minstrel.free(priv); | |
1353 | } | |
1354 | ||
cca674d4 AQ |
1355 | static u32 minstrel_ht_get_expected_throughput(void *priv_sta) |
1356 | { | |
1357 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1358 | struct minstrel_ht_sta *mi = &msp->ht; | |
50e55a8e | 1359 | int i, j, prob, tp_avg; |
cca674d4 AQ |
1360 | |
1361 | if (!msp->is_ht) | |
1362 | return mac80211_minstrel.get_expected_throughput(priv_sta); | |
1363 | ||
5935839a TH |
1364 | i = mi->max_tp_rate[0] / MCS_GROUP_RATES; |
1365 | j = mi->max_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e | 1366 | prob = mi->groups[i].rates[j].prob_ewma; |
cca674d4 | 1367 | |
6a27b2c4 | 1368 | /* convert tp_avg from pkt per second in kbps */ |
212c5a5e SE |
1369 | tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * 10; |
1370 | tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024; | |
6a27b2c4 TH |
1371 | |
1372 | return tp_avg; | |
cca674d4 AQ |
1373 | } |
1374 | ||
631ad703 | 1375 | static const struct rate_control_ops mac80211_minstrel_ht = { |
ec8aa669 | 1376 | .name = "minstrel_ht", |
18fb84d9 | 1377 | .tx_status_ext = minstrel_ht_tx_status, |
ec8aa669 FF |
1378 | .get_rate = minstrel_ht_get_rate, |
1379 | .rate_init = minstrel_ht_rate_init, | |
1380 | .rate_update = minstrel_ht_rate_update, | |
1381 | .alloc_sta = minstrel_ht_alloc_sta, | |
1382 | .free_sta = minstrel_ht_free_sta, | |
1383 | .alloc = minstrel_ht_alloc, | |
1384 | .free = minstrel_ht_free, | |
1385 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1386 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, | |
1387 | .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs, | |
1388 | #endif | |
cca674d4 | 1389 | .get_expected_throughput = minstrel_ht_get_expected_throughput, |
ec8aa669 FF |
1390 | }; |
1391 | ||
1392 | ||
f6e1a73b | 1393 | static void __init init_sample_table(void) |
ec8aa669 FF |
1394 | { |
1395 | int col, i, new_idx; | |
1396 | u8 rnd[MCS_GROUP_RATES]; | |
1397 | ||
1398 | memset(sample_table, 0xff, sizeof(sample_table)); | |
1399 | for (col = 0; col < SAMPLE_COLUMNS; col++) { | |
f7d8ad81 | 1400 | prandom_bytes(rnd, sizeof(rnd)); |
ec8aa669 | 1401 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
ec8aa669 | 1402 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
ec8aa669 FF |
1403 | while (sample_table[col][new_idx] != 0xff) |
1404 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; | |
1405 | ||
1406 | sample_table[col][new_idx] = i; | |
1407 | } | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | int __init | |
1412 | rc80211_minstrel_ht_init(void) | |
1413 | { | |
1414 | init_sample_table(); | |
1415 | return ieee80211_rate_control_register(&mac80211_minstrel_ht); | |
1416 | } | |
1417 | ||
1418 | void | |
1419 | rc80211_minstrel_ht_exit(void) | |
1420 | { | |
1421 | ieee80211_rate_control_unregister(&mac80211_minstrel_ht); | |
1422 | } |