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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 | ||
c2b17948 FF |
54 | #define _MAX(a, b) (((a)>(b))?(a):(b)) |
55 | ||
56 | #define GROUP_SHIFT(duration) \ | |
57 | _MAX(0, 16 - __builtin_clz(duration)) | |
58 | ||
ec8aa669 | 59 | /* MCS rate information for an MCS group */ |
c2b17948 | 60 | #define __MCS_GROUP(_streams, _sgi, _ht40, _s) \ |
a5f69d94 | 61 | [GROUP_IDX(_streams, _sgi, _ht40)] = { \ |
ec8aa669 | 62 | .streams = _streams, \ |
202df504 | 63 | .shift = _s, \ |
ec8aa669 | 64 | .flags = \ |
3ec373c4 | 65 | IEEE80211_TX_RC_MCS | \ |
ec8aa669 FF |
66 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
67 | (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ | |
68 | .duration = { \ | |
202df504 FF |
69 | MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26) >> _s, \ |
70 | MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52) >> _s, \ | |
71 | MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78) >> _s, \ | |
72 | MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104) >> _s, \ | |
73 | MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156) >> _s, \ | |
74 | MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208) >> _s, \ | |
75 | MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234) >> _s, \ | |
76 | MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) >> _s \ | |
ec8aa669 FF |
77 | } \ |
78 | } | |
79 | ||
c2b17948 FF |
80 | #define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \ |
81 | GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26)) | |
82 | ||
83 | #define MCS_GROUP(_streams, _sgi, _ht40) \ | |
84 | __MCS_GROUP(_streams, _sgi, _ht40, \ | |
85 | MCS_GROUP_SHIFT(_streams, _sgi, _ht40)) | |
86 | ||
9208247d KB |
87 | #define VHT_GROUP_IDX(_streams, _sgi, _bw) \ |
88 | (MINSTREL_VHT_GROUP_0 + \ | |
89 | MINSTREL_MAX_STREAMS * 2 * (_bw) + \ | |
90 | MINSTREL_MAX_STREAMS * (_sgi) + \ | |
91 | (_streams) - 1) | |
92 | ||
93 | #define BW2VBPS(_bw, r3, r2, r1) \ | |
94 | (_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1) | |
95 | ||
c2b17948 | 96 | #define __VHT_GROUP(_streams, _sgi, _bw, _s) \ |
9208247d KB |
97 | [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \ |
98 | .streams = _streams, \ | |
202df504 | 99 | .shift = _s, \ |
9208247d KB |
100 | .flags = \ |
101 | IEEE80211_TX_RC_VHT_MCS | \ | |
102 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ | |
103 | (_bw == BW_80 ? IEEE80211_TX_RC_80_MHZ_WIDTH : \ | |
104 | _bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ | |
105 | .duration = { \ | |
106 | MCS_DURATION(_streams, _sgi, \ | |
202df504 | 107 | BW2VBPS(_bw, 117, 54, 26)) >> _s, \ |
9208247d | 108 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 109 | BW2VBPS(_bw, 234, 108, 52)) >> _s, \ |
9208247d | 110 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 111 | BW2VBPS(_bw, 351, 162, 78)) >> _s, \ |
9208247d | 112 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 113 | BW2VBPS(_bw, 468, 216, 104)) >> _s, \ |
9208247d | 114 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 115 | BW2VBPS(_bw, 702, 324, 156)) >> _s, \ |
9208247d | 116 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 117 | BW2VBPS(_bw, 936, 432, 208)) >> _s, \ |
9208247d | 118 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 119 | BW2VBPS(_bw, 1053, 486, 234)) >> _s, \ |
9208247d | 120 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 121 | BW2VBPS(_bw, 1170, 540, 260)) >> _s, \ |
9208247d | 122 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 123 | BW2VBPS(_bw, 1404, 648, 312)) >> _s, \ |
9208247d | 124 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 125 | BW2VBPS(_bw, 1560, 720, 346)) >> _s \ |
9208247d KB |
126 | } \ |
127 | } | |
128 | ||
c2b17948 FF |
129 | #define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \ |
130 | GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \ | |
131 | BW2VBPS(_bw, 117, 54, 26))) | |
132 | ||
133 | #define VHT_GROUP(_streams, _sgi, _bw) \ | |
134 | __VHT_GROUP(_streams, _sgi, _bw, \ | |
135 | VHT_GROUP_SHIFT(_streams, _sgi, _bw)) | |
136 | ||
a0497f9f | 137 | #define CCK_DURATION(_bitrate, _short, _len) \ |
ed97a13c | 138 | (1000 * (10 /* SIFS */ + \ |
f359d3fe | 139 | (_short ? 72 + 24 : 144 + 48) + \ |
ed97a13c | 140 | (8 * (_len + 4) * 10) / (_bitrate))) |
a0497f9f FF |
141 | |
142 | #define CCK_ACK_DURATION(_bitrate, _short) \ | |
143 | (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \ | |
144 | CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE)) | |
145 | ||
202df504 FF |
146 | #define CCK_DURATION_LIST(_short, _s) \ |
147 | CCK_ACK_DURATION(10, _short) >> _s, \ | |
148 | CCK_ACK_DURATION(20, _short) >> _s, \ | |
149 | CCK_ACK_DURATION(55, _short) >> _s, \ | |
150 | CCK_ACK_DURATION(110, _short) >> _s | |
a0497f9f | 151 | |
c2b17948 | 152 | #define __CCK_GROUP(_s) \ |
8a0ee4fe | 153 | [MINSTREL_CCK_GROUP] = { \ |
80df9be6 | 154 | .streams = 1, \ |
3ec373c4 | 155 | .flags = 0, \ |
202df504 | 156 | .shift = _s, \ |
8a0ee4fe | 157 | .duration = { \ |
202df504 FF |
158 | CCK_DURATION_LIST(false, _s), \ |
159 | CCK_DURATION_LIST(true, _s) \ | |
8a0ee4fe | 160 | } \ |
a0497f9f FF |
161 | } |
162 | ||
c2b17948 FF |
163 | #define CCK_GROUP_SHIFT \ |
164 | GROUP_SHIFT(CCK_ACK_DURATION(10, false)) | |
165 | ||
166 | #define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT) | |
167 | ||
168 | ||
9208247d KB |
169 | static bool minstrel_vht_only = true; |
170 | module_param(minstrel_vht_only, bool, 0644); | |
171 | MODULE_PARM_DESC(minstrel_vht_only, | |
172 | "Use only VHT rates when VHT is supported by sta."); | |
9208247d | 173 | |
ec8aa669 FF |
174 | /* |
175 | * To enable sufficiently targeted rate sampling, MCS rates are divided into | |
176 | * groups, based on the number of streams and flags (HT40, SGI) that they | |
177 | * use. | |
a5f69d94 HS |
178 | * |
179 | * Sortorder has to be fixed for GROUP_IDX macro to be applicable: | |
8a0ee4fe | 180 | * BW -> SGI -> #streams |
ec8aa669 FF |
181 | */ |
182 | const struct mcs_group minstrel_mcs_groups[] = { | |
c2b17948 FF |
183 | MCS_GROUP(1, 0, BW_20), |
184 | MCS_GROUP(2, 0, BW_20), | |
185 | MCS_GROUP(3, 0, BW_20), | |
186 | MCS_GROUP(4, 0, BW_20), | |
187 | ||
188 | MCS_GROUP(1, 1, BW_20), | |
189 | MCS_GROUP(2, 1, BW_20), | |
190 | MCS_GROUP(3, 1, BW_20), | |
191 | MCS_GROUP(4, 1, BW_20), | |
192 | ||
193 | MCS_GROUP(1, 0, BW_40), | |
194 | MCS_GROUP(2, 0, BW_40), | |
195 | MCS_GROUP(3, 0, BW_40), | |
196 | MCS_GROUP(4, 0, BW_40), | |
197 | ||
198 | MCS_GROUP(1, 1, BW_40), | |
199 | MCS_GROUP(2, 1, BW_40), | |
200 | MCS_GROUP(3, 1, BW_40), | |
201 | MCS_GROUP(4, 1, BW_40), | |
202 | ||
203 | CCK_GROUP, | |
204 | ||
205 | VHT_GROUP(1, 0, BW_20), | |
206 | VHT_GROUP(2, 0, BW_20), | |
207 | VHT_GROUP(3, 0, BW_20), | |
208 | VHT_GROUP(4, 0, BW_20), | |
209 | ||
210 | VHT_GROUP(1, 1, BW_20), | |
211 | VHT_GROUP(2, 1, BW_20), | |
212 | VHT_GROUP(3, 1, BW_20), | |
213 | VHT_GROUP(4, 1, BW_20), | |
214 | ||
215 | VHT_GROUP(1, 0, BW_40), | |
216 | VHT_GROUP(2, 0, BW_40), | |
217 | VHT_GROUP(3, 0, BW_40), | |
218 | VHT_GROUP(4, 0, BW_40), | |
219 | ||
220 | VHT_GROUP(1, 1, BW_40), | |
221 | VHT_GROUP(2, 1, BW_40), | |
222 | VHT_GROUP(3, 1, BW_40), | |
223 | VHT_GROUP(4, 1, BW_40), | |
224 | ||
225 | VHT_GROUP(1, 0, BW_80), | |
226 | VHT_GROUP(2, 0, BW_80), | |
227 | VHT_GROUP(3, 0, BW_80), | |
228 | VHT_GROUP(4, 0, BW_80), | |
229 | ||
230 | VHT_GROUP(1, 1, BW_80), | |
231 | VHT_GROUP(2, 1, BW_80), | |
232 | VHT_GROUP(3, 1, BW_80), | |
233 | VHT_GROUP(4, 1, BW_80), | |
9208247d | 234 | }; |
a0497f9f | 235 | |
f6e1a73b | 236 | static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly; |
ec8aa669 | 237 | |
a8566662 FF |
238 | static void |
239 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi); | |
240 | ||
9208247d KB |
241 | /* |
242 | * Some VHT MCSes are invalid (when Ndbps / Nes is not an integer) | |
243 | * e.g for MCS9@20MHzx1Nss: Ndbps=8x52*(5/6) Nes=1 | |
244 | * | |
245 | * Returns the valid mcs map for struct minstrel_mcs_group_data.supported | |
246 | */ | |
247 | static u16 | |
248 | minstrel_get_valid_vht_rates(int bw, int nss, __le16 mcs_map) | |
249 | { | |
250 | u16 mask = 0; | |
251 | ||
252 | if (bw == BW_20) { | |
253 | if (nss != 3 && nss != 6) | |
254 | mask = BIT(9); | |
255 | } else if (bw == BW_80) { | |
256 | if (nss == 3 || nss == 7) | |
257 | mask = BIT(6); | |
258 | else if (nss == 6) | |
259 | mask = BIT(9); | |
260 | } else { | |
261 | WARN_ON(bw != BW_40); | |
262 | } | |
263 | ||
264 | switch ((le16_to_cpu(mcs_map) >> (2 * (nss - 1))) & 3) { | |
265 | case IEEE80211_VHT_MCS_SUPPORT_0_7: | |
266 | mask |= 0x300; | |
267 | break; | |
268 | case IEEE80211_VHT_MCS_SUPPORT_0_8: | |
269 | mask |= 0x200; | |
270 | break; | |
271 | case IEEE80211_VHT_MCS_SUPPORT_0_9: | |
272 | break; | |
273 | default: | |
274 | mask = 0x3ff; | |
275 | } | |
276 | ||
277 | return 0x3ff & ~mask; | |
278 | } | |
279 | ||
ec8aa669 FF |
280 | /* |
281 | * Look up an MCS group index based on mac80211 rate information | |
282 | */ | |
283 | static int | |
284 | minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) | |
285 | { | |
cc61d8df | 286 | return GROUP_IDX((rate->idx / 8) + 1, |
a5f69d94 HS |
287 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
288 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); | |
ec8aa669 FF |
289 | } |
290 | ||
9208247d KB |
291 | static int |
292 | minstrel_vht_get_group_idx(struct ieee80211_tx_rate *rate) | |
293 | { | |
294 | return VHT_GROUP_IDX(ieee80211_rate_get_vht_nss(rate), | |
295 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), | |
296 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) + | |
297 | 2*!!(rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)); | |
298 | } | |
299 | ||
a0497f9f FF |
300 | static struct minstrel_rate_stats * |
301 | minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
302 | struct ieee80211_tx_rate *rate) | |
303 | { | |
304 | int group, idx; | |
305 | ||
306 | if (rate->flags & IEEE80211_TX_RC_MCS) { | |
307 | group = minstrel_ht_get_group_idx(rate); | |
7a5e3fa2 | 308 | idx = rate->idx % 8; |
9208247d KB |
309 | } else if (rate->flags & IEEE80211_TX_RC_VHT_MCS) { |
310 | group = minstrel_vht_get_group_idx(rate); | |
311 | idx = ieee80211_rate_get_vht_mcs(rate); | |
a0497f9f FF |
312 | } else { |
313 | group = MINSTREL_CCK_GROUP; | |
314 | ||
315 | for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) | |
316 | if (rate->idx == mp->cck_rates[idx]) | |
317 | break; | |
318 | ||
319 | /* short preamble */ | |
972b66b8 FF |
320 | if ((mi->supported[group] & BIT(idx + 4)) && |
321 | (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)) | |
a0497f9f FF |
322 | idx += 4; |
323 | } | |
324 | return &mi->groups[group].rates[idx]; | |
325 | } | |
326 | ||
ec8aa669 FF |
327 | static inline struct minstrel_rate_stats * |
328 | minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) | |
329 | { | |
330 | return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES]; | |
331 | } | |
332 | ||
77f7ffdc FF |
333 | static unsigned int |
334 | minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi) | |
335 | { | |
336 | if (!mi->avg_ampdu_len) | |
337 | return AVG_AMPDU_SIZE; | |
338 | ||
339 | return MINSTREL_TRUNC(mi->avg_ampdu_len); | |
340 | } | |
341 | ||
ec8aa669 | 342 | /* |
6a27b2c4 TH |
343 | * Return current throughput based on the average A-MPDU length, taking into |
344 | * account the expected number of retransmissions and their expected length | |
ec8aa669 | 345 | */ |
6a27b2c4 | 346 | int |
50e55a8e TH |
347 | minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate, |
348 | int prob_ewma) | |
ec8aa669 | 349 | { |
ed97a13c | 350 | unsigned int nsecs = 0; |
ec8aa669 | 351 | |
9134073b | 352 | /* do not account throughput if sucess prob is below 10% */ |
50e55a8e | 353 | if (prob_ewma < MINSTREL_FRAC(10, 100)) |
6a27b2c4 | 354 | return 0; |
ec8aa669 | 355 | |
a0497f9f | 356 | if (group != MINSTREL_CCK_GROUP) |
77f7ffdc | 357 | nsecs = 1000 * mi->overhead / minstrel_ht_avg_ampdu_len(mi); |
a0497f9f | 358 | |
202df504 FF |
359 | nsecs += minstrel_mcs_groups[group].duration[rate] << |
360 | minstrel_mcs_groups[group].shift; | |
ed97a13c | 361 | |
50e55a8e TH |
362 | /* |
363 | * For the throughput calculation, limit the probability value to 90% to | |
364 | * account for collision related packet error rate fluctuation | |
365 | * (prob is scaled - see MINSTREL_FRAC above) | |
366 | */ | |
367 | if (prob_ewma > MINSTREL_FRAC(90, 100)) | |
368 | return MINSTREL_TRUNC(100000 * ((MINSTREL_FRAC(90, 100) * 1000) | |
369 | / nsecs)); | |
370 | else | |
371 | return MINSTREL_TRUNC(100000 * ((prob_ewma * 1000) / nsecs)); | |
ec8aa669 FF |
372 | } |
373 | ||
5935839a TH |
374 | /* |
375 | * Find & sort topmost throughput rates | |
376 | * | |
377 | * If multiple rates provide equal throughput the sorting is based on their | |
378 | * current success probability. Higher success probability is preferred among | |
379 | * MCS groups, CCK rates do not provide aggregation and are therefore at last. | |
380 | */ | |
381 | static void | |
d4d141ca KB |
382 | minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index, |
383 | u16 *tp_list) | |
5935839a | 384 | { |
6a27b2c4 TH |
385 | int cur_group, cur_idx, cur_tp_avg, cur_prob; |
386 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; | |
5935839a TH |
387 | int j = MAX_THR_RATES; |
388 | ||
389 | cur_group = index / MCS_GROUP_RATES; | |
390 | cur_idx = index % MCS_GROUP_RATES; | |
9134073b | 391 | cur_prob = mi->groups[cur_group].rates[cur_idx].prob_ewma; |
50e55a8e | 392 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, cur_prob); |
5935839a | 393 | |
280ba51d | 394 | do { |
5935839a TH |
395 | tmp_group = tp_list[j - 1] / MCS_GROUP_RATES; |
396 | tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES; | |
9134073b | 397 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
50e55a8e TH |
398 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, |
399 | tmp_prob); | |
6a27b2c4 TH |
400 | if (cur_tp_avg < tmp_tp_avg || |
401 | (cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob)) | |
280ba51d FF |
402 | break; |
403 | j--; | |
404 | } while (j > 0); | |
5935839a TH |
405 | |
406 | if (j < MAX_THR_RATES - 1) { | |
407 | memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) * | |
408 | (MAX_THR_RATES - (j + 1)))); | |
409 | } | |
410 | if (j < MAX_THR_RATES) | |
411 | tp_list[j] = index; | |
412 | } | |
413 | ||
414 | /* | |
415 | * Find and set the topmost probability rate per sta and per group | |
416 | */ | |
417 | static void | |
d4d141ca | 418 | minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 index) |
5935839a TH |
419 | { |
420 | struct minstrel_mcs_group_data *mg; | |
9134073b | 421 | struct minstrel_rate_stats *mrs; |
6a27b2c4 TH |
422 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
423 | int max_tp_group, cur_tp_avg, cur_group, cur_idx; | |
50e55a8e TH |
424 | int max_gpr_group, max_gpr_idx; |
425 | int max_gpr_tp_avg, max_gpr_prob; | |
5935839a | 426 | |
6a27b2c4 TH |
427 | cur_group = index / MCS_GROUP_RATES; |
428 | cur_idx = index % MCS_GROUP_RATES; | |
5935839a | 429 | mg = &mi->groups[index / MCS_GROUP_RATES]; |
9134073b | 430 | mrs = &mg->rates[index % MCS_GROUP_RATES]; |
5935839a TH |
431 | |
432 | tmp_group = mi->max_prob_rate / MCS_GROUP_RATES; | |
433 | tmp_idx = mi->max_prob_rate % MCS_GROUP_RATES; | |
9134073b | 434 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
50e55a8e | 435 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
5935839a TH |
436 | |
437 | /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from | |
438 | * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */ | |
439 | max_tp_group = mi->max_tp_rate[0] / MCS_GROUP_RATES; | |
440 | if((index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) && | |
441 | (max_tp_group != MINSTREL_CCK_GROUP)) | |
442 | return; | |
443 | ||
f84a9372 KK |
444 | max_gpr_group = mg->max_group_prob_rate / MCS_GROUP_RATES; |
445 | max_gpr_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; | |
446 | max_gpr_prob = mi->groups[max_gpr_group].rates[max_gpr_idx].prob_ewma; | |
447 | ||
9134073b | 448 | if (mrs->prob_ewma > MINSTREL_FRAC(75, 100)) { |
50e55a8e TH |
449 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, |
450 | mrs->prob_ewma); | |
6a27b2c4 | 451 | if (cur_tp_avg > tmp_tp_avg) |
5935839a | 452 | mi->max_prob_rate = index; |
6a27b2c4 | 453 | |
50e55a8e TH |
454 | max_gpr_tp_avg = minstrel_ht_get_tp_avg(mi, max_gpr_group, |
455 | max_gpr_idx, | |
456 | max_gpr_prob); | |
457 | if (cur_tp_avg > max_gpr_tp_avg) | |
5935839a TH |
458 | mg->max_group_prob_rate = index; |
459 | } else { | |
9134073b | 460 | if (mrs->prob_ewma > tmp_prob) |
5935839a | 461 | mi->max_prob_rate = index; |
f84a9372 | 462 | if (mrs->prob_ewma > max_gpr_prob) |
5935839a TH |
463 | mg->max_group_prob_rate = index; |
464 | } | |
465 | } | |
466 | ||
467 | ||
468 | /* | |
469 | * Assign new rate set per sta and use CCK rates only if the fastest | |
470 | * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted | |
471 | * rate sets where MCS and CCK rates are mixed, because CCK rates can | |
472 | * not use aggregation. | |
473 | */ | |
474 | static void | |
475 | minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi, | |
d4d141ca KB |
476 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], |
477 | u16 tmp_cck_tp_rate[MAX_THR_RATES]) | |
5935839a | 478 | { |
50e55a8e | 479 | unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob; |
5935839a TH |
480 | int i; |
481 | ||
482 | tmp_group = tmp_cck_tp_rate[0] / MCS_GROUP_RATES; | |
483 | tmp_idx = tmp_cck_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e TH |
484 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
485 | tmp_cck_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); | |
5935839a TH |
486 | |
487 | tmp_group = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES; | |
488 | tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e TH |
489 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
490 | tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); | |
5935839a TH |
491 | |
492 | if (tmp_cck_tp > tmp_mcs_tp) { | |
493 | for(i = 0; i < MAX_THR_RATES; i++) { | |
494 | minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i], | |
495 | tmp_mcs_tp_rate); | |
496 | } | |
497 | } | |
498 | ||
499 | } | |
500 | ||
501 | /* | |
502 | * Try to increase robustness of max_prob rate by decrease number of | |
503 | * streams if possible. | |
504 | */ | |
505 | static inline void | |
506 | minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi) | |
507 | { | |
508 | struct minstrel_mcs_group_data *mg; | |
50e55a8e | 509 | int tmp_max_streams, group, tmp_idx, tmp_prob; |
5935839a TH |
510 | int tmp_tp = 0; |
511 | ||
512 | tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / | |
513 | MCS_GROUP_RATES].streams; | |
514 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
515 | mg = &mi->groups[group]; | |
41d08583 | 516 | if (!mi->supported[group] || group == MINSTREL_CCK_GROUP) |
5935839a | 517 | continue; |
6a27b2c4 TH |
518 | |
519 | tmp_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; | |
50e55a8e | 520 | tmp_prob = mi->groups[group].rates[tmp_idx].prob_ewma; |
6a27b2c4 | 521 | |
50e55a8e | 522 | if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, tmp_idx, tmp_prob) && |
5935839a TH |
523 | (minstrel_mcs_groups[group].streams < tmp_max_streams)) { |
524 | mi->max_prob_rate = mg->max_group_prob_rate; | |
6a27b2c4 | 525 | tmp_tp = minstrel_ht_get_tp_avg(mi, group, |
50e55a8e TH |
526 | tmp_idx, |
527 | tmp_prob); | |
5935839a TH |
528 | } |
529 | } | |
530 | } | |
531 | ||
ec8aa669 FF |
532 | /* |
533 | * Update rate statistics and select new primary rates | |
534 | * | |
535 | * Rules for rate selection: | |
536 | * - max_prob_rate must use only one stream, as a tradeoff between delivery | |
537 | * probability and throughput during strong fluctuations | |
5935839a | 538 | * - as long as the max prob rate has a probability of more than 75%, pick |
ec8aa669 FF |
539 | * higher throughput rates, even if the probablity is a bit lower |
540 | */ | |
541 | static void | |
542 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
543 | { | |
544 | struct minstrel_mcs_group_data *mg; | |
9134073b | 545 | struct minstrel_rate_stats *mrs; |
50e55a8e | 546 | int group, i, j, cur_prob; |
d4d141ca KB |
547 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES]; |
548 | u16 tmp_cck_tp_rate[MAX_THR_RATES], index; | |
ec8aa669 FF |
549 | |
550 | if (mi->ampdu_packets > 0) { | |
77f7ffdc FF |
551 | if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN)) |
552 | mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, | |
553 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), | |
554 | EWMA_LEVEL); | |
555 | else | |
556 | mi->avg_ampdu_len = 0; | |
ec8aa669 FF |
557 | mi->ampdu_len = 0; |
558 | mi->ampdu_packets = 0; | |
559 | } | |
560 | ||
561 | mi->sample_slow = 0; | |
562 | mi->sample_count = 0; | |
ec8aa669 | 563 | |
5935839a TH |
564 | /* Initialize global rate indexes */ |
565 | for(j = 0; j < MAX_THR_RATES; j++){ | |
566 | tmp_mcs_tp_rate[j] = 0; | |
567 | tmp_cck_tp_rate[j] = 0; | |
568 | } | |
c2eb5b0f | 569 | |
5935839a TH |
570 | /* Find best rate sets within all MCS groups*/ |
571 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
ec8aa669 FF |
572 | |
573 | mg = &mi->groups[group]; | |
41d08583 | 574 | if (!mi->supported[group]) |
ec8aa669 FF |
575 | continue; |
576 | ||
ec8aa669 FF |
577 | mi->sample_count++; |
578 | ||
5935839a TH |
579 | /* (re)Initialize group rate indexes */ |
580 | for(j = 0; j < MAX_THR_RATES; j++) | |
581 | tmp_group_tp_rate[j] = group; | |
582 | ||
ec8aa669 | 583 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
41d08583 | 584 | if (!(mi->supported[group] & BIT(i))) |
ec8aa669 FF |
585 | continue; |
586 | ||
351df099 KB |
587 | index = MCS_GROUP_RATES * group + i; |
588 | ||
9134073b TH |
589 | mrs = &mg->rates[i]; |
590 | mrs->retry_updated = false; | |
591 | minstrel_calc_rate_stats(mrs); | |
50e55a8e | 592 | cur_prob = mrs->prob_ewma; |
ec8aa669 | 593 | |
50e55a8e | 594 | if (minstrel_ht_get_tp_avg(mi, group, i, cur_prob) == 0) |
ec8aa669 FF |
595 | continue; |
596 | ||
5935839a TH |
597 | /* Find max throughput rate set */ |
598 | if (group != MINSTREL_CCK_GROUP) { | |
599 | minstrel_ht_sort_best_tp_rates(mi, index, | |
600 | tmp_mcs_tp_rate); | |
601 | } else if (group == MINSTREL_CCK_GROUP) { | |
602 | minstrel_ht_sort_best_tp_rates(mi, index, | |
603 | tmp_cck_tp_rate); | |
ec8aa669 | 604 | } |
ec8aa669 | 605 | |
5935839a TH |
606 | /* Find max throughput rate set within a group */ |
607 | minstrel_ht_sort_best_tp_rates(mi, index, | |
608 | tmp_group_tp_rate); | |
ec8aa669 | 609 | |
5935839a TH |
610 | /* Find max probability rate per group and global */ |
611 | minstrel_ht_set_best_prob_rate(mi, index); | |
ec8aa669 FF |
612 | } |
613 | ||
5935839a TH |
614 | memcpy(mg->max_group_tp_rate, tmp_group_tp_rate, |
615 | sizeof(mg->max_group_tp_rate)); | |
ec8aa669 FF |
616 | } |
617 | ||
5935839a TH |
618 | /* Assign new rate set per sta */ |
619 | minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, tmp_cck_tp_rate); | |
620 | memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate)); | |
a299c6d5 | 621 | |
5935839a TH |
622 | /* Try to increase robustness of max_prob_rate*/ |
623 | minstrel_ht_prob_rate_reduce_streams(mi); | |
624 | ||
625 | /* try to sample all available rates during each interval */ | |
626 | mi->sample_count *= 8; | |
a299c6d5 | 627 | |
37feb7e2 LB |
628 | #ifdef CONFIG_MAC80211_DEBUGFS |
629 | /* use fixed index if set */ | |
630 | if (mp->fixed_rate_idx != -1) { | |
5935839a TH |
631 | for (i = 0; i < 4; i++) |
632 | mi->max_tp_rate[i] = mp->fixed_rate_idx; | |
37feb7e2 LB |
633 | mi->max_prob_rate = mp->fixed_rate_idx; |
634 | } | |
635 | #endif | |
a299c6d5 | 636 | |
5935839a | 637 | /* Reset update timer */ |
9134073b | 638 | mi->last_stats_update = jiffies; |
ec8aa669 FF |
639 | } |
640 | ||
641 | static bool | |
a0497f9f | 642 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
ec8aa669 | 643 | { |
b79296be | 644 | if (rate->idx < 0) |
ec8aa669 FF |
645 | return false; |
646 | ||
b79296be | 647 | if (!rate->count) |
ec8aa669 FF |
648 | return false; |
649 | ||
9208247d KB |
650 | if (rate->flags & IEEE80211_TX_RC_MCS || |
651 | rate->flags & IEEE80211_TX_RC_VHT_MCS) | |
a0497f9f FF |
652 | return true; |
653 | ||
654 | return rate->idx == mp->cck_rates[0] || | |
655 | rate->idx == mp->cck_rates[1] || | |
656 | rate->idx == mp->cck_rates[2] || | |
657 | rate->idx == mp->cck_rates[3]; | |
ec8aa669 FF |
658 | } |
659 | ||
660 | static void | |
9134073b | 661 | minstrel_set_next_sample_idx(struct minstrel_ht_sta *mi) |
ec8aa669 FF |
662 | { |
663 | struct minstrel_mcs_group_data *mg; | |
664 | ||
665 | for (;;) { | |
666 | mi->sample_group++; | |
667 | mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); | |
668 | mg = &mi->groups[mi->sample_group]; | |
669 | ||
41d08583 | 670 | if (!mi->supported[mi->sample_group]) |
ec8aa669 FF |
671 | continue; |
672 | ||
673 | if (++mg->index >= MCS_GROUP_RATES) { | |
674 | mg->index = 0; | |
675 | if (++mg->column >= ARRAY_SIZE(sample_table)) | |
676 | mg->column = 0; | |
677 | } | |
678 | break; | |
679 | } | |
680 | } | |
681 | ||
682 | static void | |
d4d141ca | 683 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u16 *idx, bool primary) |
ec8aa669 FF |
684 | { |
685 | int group, orig_group; | |
686 | ||
687 | orig_group = group = *idx / MCS_GROUP_RATES; | |
688 | while (group > 0) { | |
689 | group--; | |
690 | ||
41d08583 | 691 | if (!mi->supported[group]) |
ec8aa669 FF |
692 | continue; |
693 | ||
694 | if (minstrel_mcs_groups[group].streams > | |
695 | minstrel_mcs_groups[orig_group].streams) | |
696 | continue; | |
697 | ||
698 | if (primary) | |
5935839a | 699 | *idx = mi->groups[group].max_group_tp_rate[0]; |
ec8aa669 | 700 | else |
5935839a | 701 | *idx = mi->groups[group].max_group_tp_rate[1]; |
ec8aa669 FF |
702 | break; |
703 | } | |
704 | } | |
705 | ||
706 | static void | |
6048d763 | 707 | minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
ec8aa669 FF |
708 | { |
709 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
710 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
711 | u16 tid; | |
712 | ||
75769c80 FF |
713 | if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
714 | return; | |
715 | ||
ec8aa669 FF |
716 | if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) |
717 | return; | |
718 | ||
e133fae2 | 719 | if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) |
ec8aa669 FF |
720 | return; |
721 | ||
a1f2ba04 | 722 | tid = ieee80211_get_tid(hdr); |
a622ab72 | 723 | if (likely(sta->ampdu_mlme.tid_tx[tid])) |
ec8aa669 FF |
724 | return; |
725 | ||
7a36b930 | 726 | ieee80211_start_tx_ba_session(pubsta, tid, 0); |
ec8aa669 FF |
727 | } |
728 | ||
729 | static void | |
730 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, | |
18fb84d9 | 731 | void *priv_sta, struct ieee80211_tx_status *st) |
ec8aa669 | 732 | { |
18fb84d9 | 733 | struct ieee80211_tx_info *info = st->info; |
ec8aa669 FF |
734 | struct minstrel_ht_sta_priv *msp = priv_sta; |
735 | struct minstrel_ht_sta *mi = &msp->ht; | |
ec8aa669 FF |
736 | struct ieee80211_tx_rate *ar = info->status.rates; |
737 | struct minstrel_rate_stats *rate, *rate2; | |
738 | struct minstrel_priv *mp = priv; | |
a8566662 | 739 | bool last, update = false; |
a544ab7f | 740 | int i; |
ec8aa669 FF |
741 | |
742 | if (!msp->is_ht) | |
18fb84d9 FF |
743 | return mac80211_minstrel.tx_status_ext(priv, sband, |
744 | &msp->legacy, st); | |
ec8aa669 FF |
745 | |
746 | /* This packet was aggregated but doesn't carry status info */ | |
747 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
748 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
749 | return; | |
750 | ||
15d46f38 BS |
751 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
752 | info->status.ampdu_ack_len = | |
753 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); | |
ec8aa669 FF |
754 | info->status.ampdu_len = 1; |
755 | } | |
756 | ||
757 | mi->ampdu_packets++; | |
758 | mi->ampdu_len += info->status.ampdu_len; | |
759 | ||
760 | if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { | |
77f7ffdc FF |
761 | int avg_ampdu_len = minstrel_ht_avg_ampdu_len(mi); |
762 | ||
763 | mi->sample_wait = 16 + 2 * avg_ampdu_len; | |
52c00a37 | 764 | mi->sample_tries = 1; |
ec8aa669 FF |
765 | mi->sample_count--; |
766 | } | |
767 | ||
8d5eab5a | 768 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
ec8aa669 | 769 | mi->sample_packets += info->status.ampdu_len; |
ec8aa669 | 770 | |
a0497f9f | 771 | last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
ec8aa669 FF |
772 | for (i = 0; !last; i++) { |
773 | last = (i == IEEE80211_TX_MAX_RATES - 1) || | |
a0497f9f | 774 | !minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
ec8aa669 | 775 | |
a0497f9f | 776 | rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
ec8aa669 | 777 | |
15d46f38 | 778 | if (last) |
ec8aa669 FF |
779 | rate->success += info->status.ampdu_ack_len; |
780 | ||
781 | rate->attempts += ar[i].count * info->status.ampdu_len; | |
782 | } | |
783 | ||
784 | /* | |
785 | * check for sudden death of spatial multiplexing, | |
786 | * downgrade to a lower number of streams if necessary. | |
787 | */ | |
5935839a | 788 | rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]); |
ec8aa669 FF |
789 | if (rate->attempts > 30 && |
790 | MINSTREL_FRAC(rate->success, rate->attempts) < | |
a8566662 | 791 | MINSTREL_FRAC(20, 100)) { |
5935839a | 792 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true); |
a8566662 FF |
793 | update = true; |
794 | } | |
ec8aa669 | 795 | |
5935839a | 796 | rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]); |
ecc3d5ae ML |
797 | if (rate2->attempts > 30 && |
798 | MINSTREL_FRAC(rate2->success, rate2->attempts) < | |
a8566662 | 799 | MINSTREL_FRAC(20, 100)) { |
5935839a | 800 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false); |
a8566662 FF |
801 | update = true; |
802 | } | |
ec8aa669 | 803 | |
9134073b TH |
804 | if (time_after(jiffies, mi->last_stats_update + |
805 | (mp->update_interval / 2 * HZ) / 1000)) { | |
a8566662 | 806 | update = true; |
ec8aa669 | 807 | minstrel_ht_update_stats(mp, mi); |
ec8aa669 | 808 | } |
a8566662 FF |
809 | |
810 | if (update) | |
811 | minstrel_ht_update_rates(mp, mi); | |
ec8aa669 FF |
812 | } |
813 | ||
202df504 FF |
814 | static inline int |
815 | minstrel_get_duration(int index) | |
816 | { | |
817 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
818 | unsigned int duration = group->duration[index % MCS_GROUP_RATES]; | |
819 | return duration << group->shift; | |
820 | } | |
821 | ||
ec8aa669 FF |
822 | static void |
823 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
824 | int index) | |
825 | { | |
9134073b | 826 | struct minstrel_rate_stats *mrs; |
ec8aa669 FF |
827 | unsigned int tx_time, tx_time_rtscts, tx_time_data; |
828 | unsigned int cw = mp->cw_min; | |
8fddddff | 829 | unsigned int ctime = 0; |
ec8aa669 | 830 | unsigned int t_slot = 9; /* FIXME */ |
77f7ffdc | 831 | unsigned int ampdu_len = minstrel_ht_avg_ampdu_len(mi); |
a0497f9f | 832 | unsigned int overhead = 0, overhead_rtscts = 0; |
ec8aa669 | 833 | |
9134073b TH |
834 | mrs = minstrel_get_ratestats(mi, index); |
835 | if (mrs->prob_ewma < MINSTREL_FRAC(1, 10)) { | |
836 | mrs->retry_count = 1; | |
837 | mrs->retry_count_rtscts = 1; | |
ec8aa669 FF |
838 | return; |
839 | } | |
840 | ||
9134073b TH |
841 | mrs->retry_count = 2; |
842 | mrs->retry_count_rtscts = 2; | |
843 | mrs->retry_updated = true; | |
ec8aa669 | 844 | |
202df504 | 845 | tx_time_data = minstrel_get_duration(index) * ampdu_len / 1000; |
8fddddff DH |
846 | |
847 | /* Contention time for first 2 tries */ | |
848 | ctime = (t_slot * cw) >> 1; | |
849 | cw = min((cw << 1) | 1, mp->cw_max); | |
850 | ctime += (t_slot * cw) >> 1; | |
851 | cw = min((cw << 1) | 1, mp->cw_max); | |
852 | ||
a0497f9f FF |
853 | if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { |
854 | overhead = mi->overhead; | |
855 | overhead_rtscts = mi->overhead_rtscts; | |
856 | } | |
857 | ||
8fddddff | 858 | /* Total TX time for data and Contention after first 2 tries */ |
a0497f9f FF |
859 | tx_time = ctime + 2 * (overhead + tx_time_data); |
860 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); | |
8fddddff DH |
861 | |
862 | /* See how many more tries we can fit inside segment size */ | |
ec8aa669 | 863 | do { |
8fddddff DH |
864 | /* Contention time for this try */ |
865 | ctime = (t_slot * cw) >> 1; | |
866 | cw = min((cw << 1) | 1, mp->cw_max); | |
867 | ||
868 | /* Total TX time after this try */ | |
a0497f9f FF |
869 | tx_time += ctime + overhead + tx_time_data; |
870 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; | |
8fddddff | 871 | |
ec8aa669 | 872 | if (tx_time_rtscts < mp->segment_size) |
9134073b | 873 | mrs->retry_count_rtscts++; |
ec8aa669 | 874 | } while ((tx_time < mp->segment_size) && |
9134073b | 875 | (++mrs->retry_count < mp->max_retry)); |
ec8aa669 FF |
876 | } |
877 | ||
878 | ||
879 | static void | |
880 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
a8566662 | 881 | struct ieee80211_sta_rates *ratetbl, int offset, int index) |
ec8aa669 FF |
882 | { |
883 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
9134073b | 884 | struct minstrel_rate_stats *mrs; |
a8566662 | 885 | u8 idx; |
3ec373c4 | 886 | u16 flags = group->flags; |
ec8aa669 | 887 | |
9134073b TH |
888 | mrs = minstrel_get_ratestats(mi, index); |
889 | if (!mrs->retry_updated) | |
ec8aa669 FF |
890 | minstrel_calc_retransmit(mp, mi, index); |
891 | ||
9134073b | 892 | if (mrs->prob_ewma < MINSTREL_FRAC(20, 100) || !mrs->retry_count) { |
a8566662 FF |
893 | ratetbl->rate[offset].count = 2; |
894 | ratetbl->rate[offset].count_rts = 2; | |
895 | ratetbl->rate[offset].count_cts = 2; | |
896 | } else { | |
9134073b TH |
897 | ratetbl->rate[offset].count = mrs->retry_count; |
898 | ratetbl->rate[offset].count_cts = mrs->retry_count; | |
899 | ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts; | |
a8566662 | 900 | } |
a0497f9f | 901 | |
3ec373c4 | 902 | if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) |
a8566662 | 903 | idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
9208247d KB |
904 | else if (flags & IEEE80211_TX_RC_VHT_MCS) |
905 | idx = ((group->streams - 1) << 4) | | |
906 | ((index % MCS_GROUP_RATES) & 0xF); | |
3ec373c4 | 907 | else |
7a5e3fa2 | 908 | idx = index % MCS_GROUP_RATES + (group->streams - 1) * 8; |
a8566662 | 909 | |
a3ebb4e1 KC |
910 | /* enable RTS/CTS if needed: |
911 | * - if station is in dynamic SMPS (and streams > 1) | |
912 | * - for fallback rates, to increase chances of getting through | |
913 | */ | |
c36dd3ea | 914 | if (offset > 0 || |
a3ebb4e1 KC |
915 | (mi->sta->smps_mode == IEEE80211_SMPS_DYNAMIC && |
916 | group->streams > 1)) { | |
a8566662 FF |
917 | ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; |
918 | flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
919 | } | |
920 | ||
921 | ratetbl->rate[offset].idx = idx; | |
922 | ratetbl->rate[offset].flags = flags; | |
923 | } | |
924 | ||
918fe04b FF |
925 | static inline int |
926 | minstrel_ht_get_prob_ewma(struct minstrel_ht_sta *mi, int rate) | |
927 | { | |
928 | int group = rate / MCS_GROUP_RATES; | |
929 | rate %= MCS_GROUP_RATES; | |
930 | return mi->groups[group].rates[rate].prob_ewma; | |
931 | } | |
932 | ||
933 | static int | |
934 | minstrel_ht_get_max_amsdu_len(struct minstrel_ht_sta *mi) | |
935 | { | |
936 | int group = mi->max_prob_rate / MCS_GROUP_RATES; | |
937 | const struct mcs_group *g = &minstrel_mcs_groups[group]; | |
938 | int rate = mi->max_prob_rate % MCS_GROUP_RATES; | |
202df504 | 939 | unsigned int duration; |
918fe04b FF |
940 | |
941 | /* Disable A-MSDU if max_prob_rate is bad */ | |
942 | if (mi->groups[group].rates[rate].prob_ewma < MINSTREL_FRAC(50, 100)) | |
943 | return 1; | |
944 | ||
202df504 FF |
945 | duration = g->duration[rate]; |
946 | duration <<= g->shift; | |
947 | ||
918fe04b | 948 | /* If the rate is slower than single-stream MCS1, make A-MSDU limit small */ |
202df504 | 949 | if (duration > MCS_DURATION(1, 0, 52)) |
918fe04b FF |
950 | return 500; |
951 | ||
952 | /* | |
953 | * If the rate is slower than single-stream MCS4, limit A-MSDU to usual | |
954 | * data packet size | |
955 | */ | |
202df504 | 956 | if (duration > MCS_DURATION(1, 0, 104)) |
918fe04b FF |
957 | return 1600; |
958 | ||
959 | /* | |
960 | * If the rate is slower than single-stream MCS7, or if the max throughput | |
961 | * rate success probability is less than 75%, limit A-MSDU to twice the usual | |
962 | * data packet size | |
963 | */ | |
202df504 | 964 | if (duration > MCS_DURATION(1, 0, 260) || |
918fe04b FF |
965 | (minstrel_ht_get_prob_ewma(mi, mi->max_tp_rate[0]) < |
966 | MINSTREL_FRAC(75, 100))) | |
967 | return 3200; | |
968 | ||
969 | /* | |
970 | * HT A-MPDU limits maximum MPDU size under BA agreement to 4095 bytes. | |
971 | * Since aggregation sessions are started/stopped without txq flush, use | |
972 | * the limit here to avoid the complexity of having to de-aggregate | |
973 | * packets in the queue. | |
974 | */ | |
975 | if (!mi->sta->vht_cap.vht_supported) | |
976 | return IEEE80211_MAX_MPDU_LEN_HT_BA; | |
977 | ||
978 | /* unlimited */ | |
979 | return 0; | |
980 | } | |
981 | ||
a8566662 FF |
982 | static void |
983 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
984 | { | |
985 | struct ieee80211_sta_rates *rates; | |
986 | int i = 0; | |
987 | ||
988 | rates = kzalloc(sizeof(*rates), GFP_ATOMIC); | |
989 | if (!rates) | |
a0497f9f | 990 | return; |
a8566662 | 991 | |
5935839a TH |
992 | /* Start with max_tp_rate[0] */ |
993 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]); | |
a8566662 FF |
994 | |
995 | if (mp->hw->max_rates >= 3) { | |
5935839a TH |
996 | /* At least 3 tx rates supported, use max_tp_rate[1] next */ |
997 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]); | |
a8566662 FF |
998 | } |
999 | ||
1000 | if (mp->hw->max_rates >= 2) { | |
1001 | /* | |
1002 | * At least 2 tx rates supported, use max_prob_rate next */ | |
1003 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); | |
a0497f9f FF |
1004 | } |
1005 | ||
918fe04b | 1006 | mi->sta->max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi); |
a8566662 FF |
1007 | rates->rate[i].idx = -1; |
1008 | rate_control_set_rates(mp->hw, mi->sta, rates); | |
ec8aa669 FF |
1009 | } |
1010 | ||
ec8aa669 FF |
1011 | static int |
1012 | minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
1013 | { | |
9134073b | 1014 | struct minstrel_rate_stats *mrs; |
ec8aa669 | 1015 | struct minstrel_mcs_group_data *mg; |
5935839a | 1016 | unsigned int sample_dur, sample_group, cur_max_tp_streams; |
06171e9c | 1017 | int tp_rate1, tp_rate2; |
ec8aa669 FF |
1018 | int sample_idx = 0; |
1019 | ||
1020 | if (mi->sample_wait > 0) { | |
1021 | mi->sample_wait--; | |
1022 | return -1; | |
1023 | } | |
1024 | ||
1025 | if (!mi->sample_tries) | |
1026 | return -1; | |
1027 | ||
f12140c0 KB |
1028 | sample_group = mi->sample_group; |
1029 | mg = &mi->groups[sample_group]; | |
ec8aa669 | 1030 | sample_idx = sample_table[mg->column][mg->index]; |
9134073b | 1031 | minstrel_set_next_sample_idx(mi); |
f12140c0 | 1032 | |
41d08583 | 1033 | if (!(mi->supported[sample_group] & BIT(sample_idx))) |
f12140c0 KB |
1034 | return -1; |
1035 | ||
9134073b | 1036 | mrs = &mg->rates[sample_idx]; |
965237ab | 1037 | sample_idx += sample_group * MCS_GROUP_RATES; |
ec8aa669 | 1038 | |
06171e9c FF |
1039 | /* Set tp_rate1, tp_rate2 to the highest / second highest max_tp_rate */ |
1040 | if (minstrel_get_duration(mi->max_tp_rate[0]) > | |
1041 | minstrel_get_duration(mi->max_tp_rate[1])) { | |
1042 | tp_rate1 = mi->max_tp_rate[1]; | |
1043 | tp_rate2 = mi->max_tp_rate[0]; | |
1044 | } else { | |
1045 | tp_rate1 = mi->max_tp_rate[0]; | |
1046 | tp_rate2 = mi->max_tp_rate[1]; | |
1047 | } | |
1048 | ||
ba6fa29c HS |
1049 | /* |
1050 | * Sampling might add some overhead (RTS, no aggregation) | |
06171e9c FF |
1051 | * to the frame. Hence, don't use sampling for the highest currently |
1052 | * used highest throughput or probability rate. | |
ba6fa29c | 1053 | */ |
06171e9c | 1054 | if (sample_idx == mi->max_tp_rate[0] || sample_idx == mi->max_prob_rate) |
ba6fa29c | 1055 | return -1; |
a0ca796c | 1056 | |
ec8aa669 | 1057 | /* |
f4ec7cb0 FF |
1058 | * Do not sample if the probability is already higher than 95%, |
1059 | * or if the rate is 3 times slower than the current max probability | |
1060 | * rate, to avoid wasting airtime. | |
ec8aa669 | 1061 | */ |
f4ec7cb0 FF |
1062 | sample_dur = minstrel_get_duration(sample_idx); |
1063 | if (mrs->prob_ewma > MINSTREL_FRAC(95, 100) || | |
1064 | minstrel_get_duration(mi->max_prob_rate) * 3 < sample_dur) | |
8d5eab5a | 1065 | return -1; |
ec8aa669 FF |
1066 | |
1067 | /* | |
1068 | * Make sure that lower rates get sampled only occasionally, | |
1069 | * if the link is working perfectly. | |
1070 | */ | |
5935839a | 1071 | |
06171e9c | 1072 | cur_max_tp_streams = minstrel_mcs_groups[tp_rate1 / |
5935839a | 1073 | MCS_GROUP_RATES].streams; |
06171e9c | 1074 | if (sample_dur >= minstrel_get_duration(tp_rate2) && |
5935839a | 1075 | (cur_max_tp_streams - 1 < |
965237ab FF |
1076 | minstrel_mcs_groups[sample_group].streams || |
1077 | sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { | |
9134073b | 1078 | if (mrs->sample_skipped < 20) |
8d5eab5a | 1079 | return -1; |
ec8aa669 FF |
1080 | |
1081 | if (mi->sample_slow++ > 2) | |
8d5eab5a | 1082 | return -1; |
ec8aa669 | 1083 | } |
098b8afb | 1084 | mi->sample_tries--; |
ec8aa669 FF |
1085 | |
1086 | return sample_idx; | |
ec8aa669 FF |
1087 | } |
1088 | ||
1089 | static void | |
1090 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, | |
1091 | struct ieee80211_tx_rate_control *txrc) | |
1092 | { | |
a8566662 | 1093 | const struct mcs_group *sample_group; |
ec8aa669 | 1094 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
a8566662 | 1095 | struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
ec8aa669 FF |
1096 | struct minstrel_ht_sta_priv *msp = priv_sta; |
1097 | struct minstrel_ht_sta *mi = &msp->ht; | |
1098 | struct minstrel_priv *mp = priv; | |
1099 | int sample_idx; | |
1100 | ||
1101 | if (rate_control_send_low(sta, priv_sta, txrc)) | |
1102 | return; | |
1103 | ||
1104 | if (!msp->is_ht) | |
1105 | return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); | |
1106 | ||
95943425 FF |
1107 | if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
1108 | mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) | |
1109 | minstrel_aggr_check(sta, txrc->skb); | |
1110 | ||
ec8aa669 | 1111 | info->flags |= mi->tx_flags; |
6de062ce | 1112 | |
37feb7e2 LB |
1113 | #ifdef CONFIG_MAC80211_DEBUGFS |
1114 | if (mp->fixed_rate_idx != -1) | |
1115 | return; | |
1116 | #endif | |
1117 | ||
6de062ce HS |
1118 | /* Don't use EAPOL frames for sampling on non-mrr hw */ |
1119 | if (mp->hw->max_rates == 1 && | |
af61a165 | 1120 | (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
6de062ce HS |
1121 | sample_idx = -1; |
1122 | else | |
1123 | sample_idx = minstrel_get_sample_rate(mp, mi); | |
24f7580e | 1124 | |
ec8aa669 FF |
1125 | mi->total_packets++; |
1126 | ||
1127 | /* wraparound */ | |
1128 | if (mi->total_packets == ~0) { | |
1129 | mi->total_packets = 0; | |
1130 | mi->sample_packets = 0; | |
1131 | } | |
a8566662 FF |
1132 | |
1133 | if (sample_idx < 0) | |
1134 | return; | |
1135 | ||
1136 | sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; | |
972b66b8 FF |
1137 | sample_idx %= MCS_GROUP_RATES; |
1138 | ||
1139 | if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP] && | |
1140 | (sample_idx >= 4) != txrc->short_preamble) | |
1141 | return; | |
1142 | ||
a8566662 | 1143 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
1cd15857 FF |
1144 | rate->count = 1; |
1145 | ||
972b66b8 | 1146 | if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP]) { |
1cd15857 FF |
1147 | int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); |
1148 | rate->idx = mp->cck_rates[idx]; | |
9208247d KB |
1149 | } else if (sample_group->flags & IEEE80211_TX_RC_VHT_MCS) { |
1150 | ieee80211_rate_set_vht(rate, sample_idx % MCS_GROUP_RATES, | |
1151 | sample_group->streams); | |
3ec373c4 | 1152 | } else { |
972b66b8 | 1153 | rate->idx = sample_idx + (sample_group->streams - 1) * 8; |
1cd15857 FF |
1154 | } |
1155 | ||
3ec373c4 | 1156 | rate->flags = sample_group->flags; |
ec8aa669 FF |
1157 | } |
1158 | ||
a0497f9f FF |
1159 | static void |
1160 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
1161 | struct ieee80211_supported_band *sband, | |
1162 | struct ieee80211_sta *sta) | |
1163 | { | |
1164 | int i; | |
1165 | ||
57fbcce3 | 1166 | if (sband->band != NL80211_BAND_2GHZ) |
a0497f9f FF |
1167 | return; |
1168 | ||
30686bf7 | 1169 | if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES)) |
2dfca312 FF |
1170 | return; |
1171 | ||
a0497f9f FF |
1172 | mi->cck_supported = 0; |
1173 | mi->cck_supported_short = 0; | |
1174 | for (i = 0; i < 4; i++) { | |
1175 | if (!rate_supported(sta, sband->band, mp->cck_rates[i])) | |
1176 | continue; | |
1177 | ||
1178 | mi->cck_supported |= BIT(i); | |
1179 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1180 | mi->cck_supported_short |= BIT(i); | |
1181 | } | |
1182 | ||
41d08583 | 1183 | mi->supported[MINSTREL_CCK_GROUP] = mi->cck_supported; |
a0497f9f FF |
1184 | } |
1185 | ||
ec8aa669 FF |
1186 | static void |
1187 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1188 | struct cfg80211_chan_def *chandef, |
64f68e5d | 1189 | struct ieee80211_sta *sta, void *priv_sta) |
ec8aa669 FF |
1190 | { |
1191 | struct minstrel_priv *mp = priv; | |
1192 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1193 | struct minstrel_ht_sta *mi = &msp->ht; | |
1194 | struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; | |
f458e832 | 1195 | u16 ht_cap = sta->ht_cap.cap; |
9208247d KB |
1196 | struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; |
1197 | int use_vht; | |
4dc217df | 1198 | int n_supported = 0; |
ec8aa669 FF |
1199 | int ack_dur; |
1200 | int stbc; | |
1201 | int i; | |
f458e832 | 1202 | bool ldpc; |
ec8aa669 FF |
1203 | |
1204 | /* fall back to the old minstrel for legacy stations */ | |
4dc217df FF |
1205 | if (!sta->ht_cap.ht_supported) |
1206 | goto use_legacy; | |
ec8aa669 | 1207 | |
8a0ee4fe | 1208 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB); |
ec8aa669 | 1209 | |
9208247d KB |
1210 | if (vht_cap->vht_supported) |
1211 | use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0); | |
1212 | else | |
b1c4f683 | 1213 | use_vht = 0; |
9208247d | 1214 | |
ec8aa669 FF |
1215 | msp->is_ht = true; |
1216 | memset(mi, 0, sizeof(*mi)); | |
a8566662 FF |
1217 | |
1218 | mi->sta = sta; | |
9134073b | 1219 | mi->last_stats_update = jiffies; |
ec8aa669 | 1220 | |
438b61b7 SW |
1221 | ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); |
1222 | mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); | |
1223 | mi->overhead += ack_dur; | |
ec8aa669 FF |
1224 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
1225 | ||
1226 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); | |
1227 | ||
1228 | /* When using MRR, sample more on the first attempt, without delay */ | |
1229 | if (mp->has_mrr) { | |
1230 | mi->sample_count = 16; | |
1231 | mi->sample_wait = 0; | |
1232 | } else { | |
1233 | mi->sample_count = 8; | |
1234 | mi->sample_wait = 8; | |
1235 | } | |
1236 | mi->sample_tries = 4; | |
1237 | ||
9208247d | 1238 | if (!use_vht) { |
f458e832 | 1239 | stbc = (ht_cap & IEEE80211_HT_CAP_RX_STBC) >> |
9208247d | 1240 | IEEE80211_HT_CAP_RX_STBC_SHIFT; |
ec8aa669 | 1241 | |
f458e832 C |
1242 | ldpc = ht_cap & IEEE80211_HT_CAP_LDPC_CODING; |
1243 | } else { | |
1244 | stbc = (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK) >> | |
1245 | IEEE80211_VHT_CAP_RXSTBC_SHIFT; | |
1246 | ||
1247 | ldpc = vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC; | |
9208247d | 1248 | } |
ec8aa669 | 1249 | |
f458e832 C |
1250 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; |
1251 | if (ldpc) | |
1252 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; | |
1253 | ||
ec8aa669 | 1254 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
3ec373c4 | 1255 | u32 gflags = minstrel_mcs_groups[i].flags; |
9208247d | 1256 | int bw, nss; |
3ec373c4 | 1257 | |
41d08583 | 1258 | mi->supported[i] = 0; |
a0497f9f FF |
1259 | if (i == MINSTREL_CCK_GROUP) { |
1260 | minstrel_ht_update_cck(mp, mi, sband, sta); | |
1261 | continue; | |
1262 | } | |
1263 | ||
3ec373c4 KB |
1264 | if (gflags & IEEE80211_TX_RC_SHORT_GI) { |
1265 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) { | |
f458e832 | 1266 | if (!(ht_cap & IEEE80211_HT_CAP_SGI_40)) |
e1a0c6b3 JB |
1267 | continue; |
1268 | } else { | |
f458e832 | 1269 | if (!(ht_cap & IEEE80211_HT_CAP_SGI_20)) |
e1a0c6b3 JB |
1270 | continue; |
1271 | } | |
ec8aa669 FF |
1272 | } |
1273 | ||
3ec373c4 | 1274 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
e1a0c6b3 | 1275 | sta->bandwidth < IEEE80211_STA_RX_BW_40) |
ec8aa669 FF |
1276 | continue; |
1277 | ||
9208247d KB |
1278 | nss = minstrel_mcs_groups[i].streams; |
1279 | ||
e9219779 | 1280 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
9208247d KB |
1281 | if (sta->smps_mode == IEEE80211_SMPS_STATIC && nss > 1) |
1282 | continue; | |
1283 | ||
1284 | /* HT rate */ | |
1285 | if (gflags & IEEE80211_TX_RC_MCS) { | |
9ffe9044 | 1286 | if (use_vht && minstrel_vht_only) |
9208247d | 1287 | continue; |
b1c4f683 | 1288 | |
41d08583 FF |
1289 | mi->supported[i] = mcs->rx_mask[nss - 1]; |
1290 | if (mi->supported[i]) | |
9208247d KB |
1291 | n_supported++; |
1292 | continue; | |
1293 | } | |
1294 | ||
1295 | /* VHT rate */ | |
1296 | if (!vht_cap->vht_supported || | |
1297 | WARN_ON(!(gflags & IEEE80211_TX_RC_VHT_MCS)) || | |
1298 | WARN_ON(gflags & IEEE80211_TX_RC_160_MHZ_WIDTH)) | |
e9219779 HS |
1299 | continue; |
1300 | ||
9208247d KB |
1301 | if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) { |
1302 | if (sta->bandwidth < IEEE80211_STA_RX_BW_80 || | |
1303 | ((gflags & IEEE80211_TX_RC_SHORT_GI) && | |
1304 | !(vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80))) { | |
1305 | continue; | |
1306 | } | |
1307 | } | |
1308 | ||
1309 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) | |
1310 | bw = BW_40; | |
1311 | else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) | |
1312 | bw = BW_80; | |
1313 | else | |
1314 | bw = BW_20; | |
1315 | ||
41d08583 | 1316 | mi->supported[i] = minstrel_get_valid_vht_rates(bw, nss, |
9208247d | 1317 | vht_cap->vht_mcs.tx_mcs_map); |
4dc217df | 1318 | |
41d08583 | 1319 | if (mi->supported[i]) |
4dc217df | 1320 | n_supported++; |
ec8aa669 | 1321 | } |
4dc217df FF |
1322 | |
1323 | if (!n_supported) | |
1324 | goto use_legacy; | |
1325 | ||
37439f2d | 1326 | mi->supported[MINSTREL_CCK_GROUP] |= mi->cck_supported_short << 4; |
782dda00 | 1327 | |
a8566662 | 1328 | /* create an initial rate table with the lowest supported rates */ |
a3647362 | 1329 | minstrel_ht_update_stats(mp, mi); |
a8566662 | 1330 | minstrel_ht_update_rates(mp, mi); |
a3647362 | 1331 | |
4dc217df FF |
1332 | return; |
1333 | ||
1334 | use_legacy: | |
1335 | msp->is_ht = false; | |
1336 | memset(&msp->legacy, 0, sizeof(msp->legacy)); | |
1337 | msp->legacy.r = msp->ratelist; | |
1338 | msp->legacy.sample_table = msp->sample_table; | |
3de805cf SW |
1339 | return mac80211_minstrel.rate_init(priv, sband, chandef, sta, |
1340 | &msp->legacy); | |
ec8aa669 FF |
1341 | } |
1342 | ||
1343 | static void | |
1344 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1345 | struct cfg80211_chan_def *chandef, |
ec8aa669 FF |
1346 | struct ieee80211_sta *sta, void *priv_sta) |
1347 | { | |
3de805cf | 1348 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1349 | } |
1350 | ||
1351 | static void | |
1352 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1353 | struct cfg80211_chan_def *chandef, |
ec8aa669 | 1354 | struct ieee80211_sta *sta, void *priv_sta, |
64f68e5d | 1355 | u32 changed) |
ec8aa669 | 1356 | { |
3de805cf | 1357 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1358 | } |
1359 | ||
1360 | static void * | |
1361 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) | |
1362 | { | |
1363 | struct ieee80211_supported_band *sband; | |
1364 | struct minstrel_ht_sta_priv *msp; | |
1365 | struct minstrel_priv *mp = priv; | |
1366 | struct ieee80211_hw *hw = mp->hw; | |
1367 | int max_rates = 0; | |
1368 | int i; | |
1369 | ||
57fbcce3 | 1370 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
ec8aa669 FF |
1371 | sband = hw->wiphy->bands[i]; |
1372 | if (sband && sband->n_bitrates > max_rates) | |
1373 | max_rates = sband->n_bitrates; | |
1374 | } | |
1375 | ||
472dd35c | 1376 | msp = kzalloc(sizeof(*msp), gfp); |
ec8aa669 FF |
1377 | if (!msp) |
1378 | return NULL; | |
1379 | ||
6396bb22 | 1380 | msp->ratelist = kcalloc(max_rates, sizeof(struct minstrel_rate), gfp); |
ec8aa669 FF |
1381 | if (!msp->ratelist) |
1382 | goto error; | |
1383 | ||
6da2ec56 | 1384 | msp->sample_table = kmalloc_array(max_rates, SAMPLE_COLUMNS, gfp); |
ec8aa669 FF |
1385 | if (!msp->sample_table) |
1386 | goto error1; | |
1387 | ||
1388 | return msp; | |
1389 | ||
1390 | error1: | |
7e988014 | 1391 | kfree(msp->ratelist); |
ec8aa669 FF |
1392 | error: |
1393 | kfree(msp); | |
1394 | return NULL; | |
1395 | } | |
1396 | ||
1397 | static void | |
1398 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) | |
1399 | { | |
1400 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1401 | ||
1402 | kfree(msp->sample_table); | |
1403 | kfree(msp->ratelist); | |
1404 | kfree(msp); | |
1405 | } | |
1406 | ||
b1c4f683 FF |
1407 | static void |
1408 | minstrel_ht_init_cck_rates(struct minstrel_priv *mp) | |
1409 | { | |
1410 | static const int bitrates[4] = { 10, 20, 55, 110 }; | |
1411 | struct ieee80211_supported_band *sband; | |
1412 | u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef); | |
1413 | int i, j; | |
1414 | ||
1415 | sband = mp->hw->wiphy->bands[NL80211_BAND_2GHZ]; | |
1416 | if (!sband) | |
1417 | return; | |
1418 | ||
1419 | for (i = 0; i < sband->n_bitrates; i++) { | |
1420 | struct ieee80211_rate *rate = &sband->bitrates[i]; | |
1421 | ||
1422 | if (rate->flags & IEEE80211_RATE_ERP_G) | |
1423 | continue; | |
1424 | ||
1425 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1426 | continue; | |
1427 | ||
1428 | for (j = 0; j < ARRAY_SIZE(bitrates); j++) { | |
1429 | if (rate->bitrate != bitrates[j]) | |
1430 | continue; | |
1431 | ||
1432 | mp->cck_rates[j] = i; | |
1433 | break; | |
1434 | } | |
1435 | } | |
1436 | } | |
1437 | ||
ec8aa669 FF |
1438 | static void * |
1439 | minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
1440 | { | |
b1c4f683 FF |
1441 | struct minstrel_priv *mp; |
1442 | ||
1443 | mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC); | |
1444 | if (!mp) | |
1445 | return NULL; | |
1446 | ||
1447 | /* contention window settings | |
1448 | * Just an approximation. Using the per-queue values would complicate | |
1449 | * the calculations and is probably unnecessary */ | |
1450 | mp->cw_min = 15; | |
1451 | mp->cw_max = 1023; | |
1452 | ||
1453 | /* number of packets (in %) to use for sampling other rates | |
1454 | * sample less often for non-mrr packets, because the overhead | |
1455 | * is much higher than with mrr */ | |
1456 | mp->lookaround_rate = 5; | |
1457 | mp->lookaround_rate_mrr = 10; | |
1458 | ||
1459 | /* maximum time that the hw is allowed to stay in one MRR segment */ | |
1460 | mp->segment_size = 6000; | |
1461 | ||
1462 | if (hw->max_rate_tries > 0) | |
1463 | mp->max_retry = hw->max_rate_tries; | |
1464 | else | |
1465 | /* safe default, does not necessarily have to match hw properties */ | |
1466 | mp->max_retry = 7; | |
1467 | ||
1468 | if (hw->max_rates >= 4) | |
1469 | mp->has_mrr = true; | |
1470 | ||
1471 | mp->hw = hw; | |
1472 | mp->update_interval = 100; | |
1473 | ||
1474 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1475 | mp->fixed_rate_idx = (u32) -1; | |
1476 | debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir, | |
1477 | &mp->fixed_rate_idx); | |
1478 | #endif | |
1479 | ||
1480 | minstrel_ht_init_cck_rates(mp); | |
1481 | ||
1482 | return mp; | |
ec8aa669 FF |
1483 | } |
1484 | ||
1485 | static void | |
1486 | minstrel_ht_free(void *priv) | |
1487 | { | |
b1c4f683 | 1488 | kfree(priv); |
ec8aa669 FF |
1489 | } |
1490 | ||
cca674d4 AQ |
1491 | static u32 minstrel_ht_get_expected_throughput(void *priv_sta) |
1492 | { | |
1493 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1494 | struct minstrel_ht_sta *mi = &msp->ht; | |
50e55a8e | 1495 | int i, j, prob, tp_avg; |
cca674d4 AQ |
1496 | |
1497 | if (!msp->is_ht) | |
1498 | return mac80211_minstrel.get_expected_throughput(priv_sta); | |
1499 | ||
5935839a TH |
1500 | i = mi->max_tp_rate[0] / MCS_GROUP_RATES; |
1501 | j = mi->max_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e | 1502 | prob = mi->groups[i].rates[j].prob_ewma; |
cca674d4 | 1503 | |
6a27b2c4 | 1504 | /* convert tp_avg from pkt per second in kbps */ |
212c5a5e SE |
1505 | tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * 10; |
1506 | tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024; | |
6a27b2c4 TH |
1507 | |
1508 | return tp_avg; | |
cca674d4 AQ |
1509 | } |
1510 | ||
631ad703 | 1511 | static const struct rate_control_ops mac80211_minstrel_ht = { |
ec8aa669 | 1512 | .name = "minstrel_ht", |
18fb84d9 | 1513 | .tx_status_ext = minstrel_ht_tx_status, |
ec8aa669 FF |
1514 | .get_rate = minstrel_ht_get_rate, |
1515 | .rate_init = minstrel_ht_rate_init, | |
1516 | .rate_update = minstrel_ht_rate_update, | |
1517 | .alloc_sta = minstrel_ht_alloc_sta, | |
1518 | .free_sta = minstrel_ht_free_sta, | |
1519 | .alloc = minstrel_ht_alloc, | |
1520 | .free = minstrel_ht_free, | |
1521 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1522 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, | |
ec8aa669 | 1523 | #endif |
cca674d4 | 1524 | .get_expected_throughput = minstrel_ht_get_expected_throughput, |
ec8aa669 FF |
1525 | }; |
1526 | ||
1527 | ||
f6e1a73b | 1528 | static void __init init_sample_table(void) |
ec8aa669 FF |
1529 | { |
1530 | int col, i, new_idx; | |
1531 | u8 rnd[MCS_GROUP_RATES]; | |
1532 | ||
1533 | memset(sample_table, 0xff, sizeof(sample_table)); | |
1534 | for (col = 0; col < SAMPLE_COLUMNS; col++) { | |
f7d8ad81 | 1535 | prandom_bytes(rnd, sizeof(rnd)); |
ec8aa669 | 1536 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
ec8aa669 | 1537 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
ec8aa669 FF |
1538 | while (sample_table[col][new_idx] != 0xff) |
1539 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; | |
1540 | ||
1541 | sample_table[col][new_idx] = i; | |
1542 | } | |
1543 | } | |
1544 | } | |
1545 | ||
1546 | int __init | |
b1c4f683 | 1547 | rc80211_minstrel_init(void) |
ec8aa669 FF |
1548 | { |
1549 | init_sample_table(); | |
1550 | return ieee80211_rate_control_register(&mac80211_minstrel_ht); | |
1551 | } | |
1552 | ||
1553 | void | |
b1c4f683 | 1554 | rc80211_minstrel_exit(void) |
ec8aa669 FF |
1555 | { |
1556 | ieee80211_rate_control_unregister(&mac80211_minstrel_ht); | |
1557 | } |