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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ec8aa669 | 2 | /* |
a0497f9f | 3 | * Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org> |
ec8aa669 FF |
4 | */ |
5 | #include <linux/netdevice.h> | |
6 | #include <linux/types.h> | |
7 | #include <linux/skbuff.h> | |
8 | #include <linux/debugfs.h> | |
9 | #include <linux/random.h> | |
9208247d | 10 | #include <linux/moduleparam.h> |
ec8aa669 FF |
11 | #include <linux/ieee80211.h> |
12 | #include <net/mac80211.h> | |
13 | #include "rate.h" | |
782dda00 | 14 | #include "sta_info.h" |
ec8aa669 FF |
15 | #include "rc80211_minstrel.h" |
16 | #include "rc80211_minstrel_ht.h" | |
17 | ||
d66c2582 | 18 | #define AVG_AMPDU_SIZE 16 |
ec8aa669 | 19 | #define AVG_PKT_SIZE 1200 |
ec8aa669 FF |
20 | |
21 | /* Number of bits for an average sized packet */ | |
d66c2582 | 22 | #define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3) |
ec8aa669 FF |
23 | |
24 | /* Number of symbols for a packet with (bps) bits per symbol */ | |
00591cea | 25 | #define MCS_NSYMS(bps) DIV_ROUND_UP(MCS_NBITS, (bps)) |
ec8aa669 | 26 | |
ed97a13c | 27 | /* Transmission time (nanoseconds) for a packet containing (syms) symbols */ |
ec8aa669 FF |
28 | #define MCS_SYMBOL_TIME(sgi, syms) \ |
29 | (sgi ? \ | |
ed97a13c FF |
30 | ((syms) * 18000 + 4000) / 5 : /* syms * 3.6 us */ \ |
31 | ((syms) * 1000) << 2 /* syms * 4 us */ \ | |
ec8aa669 FF |
32 | ) |
33 | ||
34 | /* Transmit duration for the raw data part of an average sized packet */ | |
d66c2582 FF |
35 | #define MCS_DURATION(streams, sgi, bps) \ |
36 | (MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) / AVG_AMPDU_SIZE) | |
ec8aa669 | 37 | |
8a0ee4fe KB |
38 | #define BW_20 0 |
39 | #define BW_40 1 | |
9208247d | 40 | #define BW_80 2 |
8a0ee4fe | 41 | |
a5f69d94 HS |
42 | /* |
43 | * Define group sort order: HT40 -> SGI -> #streams | |
44 | */ | |
45 | #define GROUP_IDX(_streams, _sgi, _ht40) \ | |
8a0ee4fe | 46 | MINSTREL_HT_GROUP_0 + \ |
a5f69d94 | 47 | MINSTREL_MAX_STREAMS * 2 * _ht40 + \ |
8a0ee4fe | 48 | MINSTREL_MAX_STREAMS * _sgi + \ |
a5f69d94 HS |
49 | _streams - 1 |
50 | ||
c2b17948 FF |
51 | #define _MAX(a, b) (((a)>(b))?(a):(b)) |
52 | ||
53 | #define GROUP_SHIFT(duration) \ | |
54 | _MAX(0, 16 - __builtin_clz(duration)) | |
55 | ||
ec8aa669 | 56 | /* MCS rate information for an MCS group */ |
c2b17948 | 57 | #define __MCS_GROUP(_streams, _sgi, _ht40, _s) \ |
a5f69d94 | 58 | [GROUP_IDX(_streams, _sgi, _ht40)] = { \ |
ec8aa669 | 59 | .streams = _streams, \ |
202df504 | 60 | .shift = _s, \ |
ec8aa669 | 61 | .flags = \ |
3ec373c4 | 62 | IEEE80211_TX_RC_MCS | \ |
ec8aa669 FF |
63 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
64 | (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ | |
65 | .duration = { \ | |
202df504 FF |
66 | MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26) >> _s, \ |
67 | MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52) >> _s, \ | |
68 | MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78) >> _s, \ | |
69 | MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104) >> _s, \ | |
70 | MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156) >> _s, \ | |
71 | MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208) >> _s, \ | |
72 | MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234) >> _s, \ | |
73 | MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) >> _s \ | |
ec8aa669 FF |
74 | } \ |
75 | } | |
76 | ||
c2b17948 FF |
77 | #define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \ |
78 | GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26)) | |
79 | ||
80 | #define MCS_GROUP(_streams, _sgi, _ht40) \ | |
81 | __MCS_GROUP(_streams, _sgi, _ht40, \ | |
82 | MCS_GROUP_SHIFT(_streams, _sgi, _ht40)) | |
83 | ||
9208247d KB |
84 | #define VHT_GROUP_IDX(_streams, _sgi, _bw) \ |
85 | (MINSTREL_VHT_GROUP_0 + \ | |
86 | MINSTREL_MAX_STREAMS * 2 * (_bw) + \ | |
87 | MINSTREL_MAX_STREAMS * (_sgi) + \ | |
88 | (_streams) - 1) | |
89 | ||
90 | #define BW2VBPS(_bw, r3, r2, r1) \ | |
91 | (_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1) | |
92 | ||
c2b17948 | 93 | #define __VHT_GROUP(_streams, _sgi, _bw, _s) \ |
9208247d KB |
94 | [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \ |
95 | .streams = _streams, \ | |
202df504 | 96 | .shift = _s, \ |
9208247d KB |
97 | .flags = \ |
98 | IEEE80211_TX_RC_VHT_MCS | \ | |
99 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ | |
100 | (_bw == BW_80 ? IEEE80211_TX_RC_80_MHZ_WIDTH : \ | |
101 | _bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ | |
102 | .duration = { \ | |
103 | MCS_DURATION(_streams, _sgi, \ | |
202df504 | 104 | BW2VBPS(_bw, 117, 54, 26)) >> _s, \ |
9208247d | 105 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 106 | BW2VBPS(_bw, 234, 108, 52)) >> _s, \ |
9208247d | 107 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 108 | BW2VBPS(_bw, 351, 162, 78)) >> _s, \ |
9208247d | 109 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 110 | BW2VBPS(_bw, 468, 216, 104)) >> _s, \ |
9208247d | 111 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 112 | BW2VBPS(_bw, 702, 324, 156)) >> _s, \ |
9208247d | 113 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 114 | BW2VBPS(_bw, 936, 432, 208)) >> _s, \ |
9208247d | 115 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 116 | BW2VBPS(_bw, 1053, 486, 234)) >> _s, \ |
9208247d | 117 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 118 | BW2VBPS(_bw, 1170, 540, 260)) >> _s, \ |
9208247d | 119 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 120 | BW2VBPS(_bw, 1404, 648, 312)) >> _s, \ |
9208247d | 121 | MCS_DURATION(_streams, _sgi, \ |
202df504 | 122 | BW2VBPS(_bw, 1560, 720, 346)) >> _s \ |
9208247d KB |
123 | } \ |
124 | } | |
125 | ||
c2b17948 FF |
126 | #define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \ |
127 | GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \ | |
128 | BW2VBPS(_bw, 117, 54, 26))) | |
129 | ||
130 | #define VHT_GROUP(_streams, _sgi, _bw) \ | |
131 | __VHT_GROUP(_streams, _sgi, _bw, \ | |
132 | VHT_GROUP_SHIFT(_streams, _sgi, _bw)) | |
133 | ||
a0497f9f | 134 | #define CCK_DURATION(_bitrate, _short, _len) \ |
ed97a13c | 135 | (1000 * (10 /* SIFS */ + \ |
f359d3fe | 136 | (_short ? 72 + 24 : 144 + 48) + \ |
ed97a13c | 137 | (8 * (_len + 4) * 10) / (_bitrate))) |
a0497f9f FF |
138 | |
139 | #define CCK_ACK_DURATION(_bitrate, _short) \ | |
140 | (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \ | |
141 | CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE)) | |
142 | ||
202df504 FF |
143 | #define CCK_DURATION_LIST(_short, _s) \ |
144 | CCK_ACK_DURATION(10, _short) >> _s, \ | |
145 | CCK_ACK_DURATION(20, _short) >> _s, \ | |
146 | CCK_ACK_DURATION(55, _short) >> _s, \ | |
147 | CCK_ACK_DURATION(110, _short) >> _s | |
a0497f9f | 148 | |
c2b17948 | 149 | #define __CCK_GROUP(_s) \ |
8a0ee4fe | 150 | [MINSTREL_CCK_GROUP] = { \ |
80df9be6 | 151 | .streams = 1, \ |
3ec373c4 | 152 | .flags = 0, \ |
202df504 | 153 | .shift = _s, \ |
8a0ee4fe | 154 | .duration = { \ |
202df504 FF |
155 | CCK_DURATION_LIST(false, _s), \ |
156 | CCK_DURATION_LIST(true, _s) \ | |
8a0ee4fe | 157 | } \ |
a0497f9f FF |
158 | } |
159 | ||
c2b17948 FF |
160 | #define CCK_GROUP_SHIFT \ |
161 | GROUP_SHIFT(CCK_ACK_DURATION(10, false)) | |
162 | ||
163 | #define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT) | |
164 | ||
165 | ||
9208247d KB |
166 | static bool minstrel_vht_only = true; |
167 | module_param(minstrel_vht_only, bool, 0644); | |
168 | MODULE_PARM_DESC(minstrel_vht_only, | |
169 | "Use only VHT rates when VHT is supported by sta."); | |
9208247d | 170 | |
ec8aa669 FF |
171 | /* |
172 | * To enable sufficiently targeted rate sampling, MCS rates are divided into | |
173 | * groups, based on the number of streams and flags (HT40, SGI) that they | |
174 | * use. | |
a5f69d94 HS |
175 | * |
176 | * Sortorder has to be fixed for GROUP_IDX macro to be applicable: | |
8a0ee4fe | 177 | * BW -> SGI -> #streams |
ec8aa669 FF |
178 | */ |
179 | const struct mcs_group minstrel_mcs_groups[] = { | |
c2b17948 FF |
180 | MCS_GROUP(1, 0, BW_20), |
181 | MCS_GROUP(2, 0, BW_20), | |
182 | MCS_GROUP(3, 0, BW_20), | |
183 | MCS_GROUP(4, 0, BW_20), | |
184 | ||
185 | MCS_GROUP(1, 1, BW_20), | |
186 | MCS_GROUP(2, 1, BW_20), | |
187 | MCS_GROUP(3, 1, BW_20), | |
188 | MCS_GROUP(4, 1, BW_20), | |
189 | ||
190 | MCS_GROUP(1, 0, BW_40), | |
191 | MCS_GROUP(2, 0, BW_40), | |
192 | MCS_GROUP(3, 0, BW_40), | |
193 | MCS_GROUP(4, 0, BW_40), | |
194 | ||
195 | MCS_GROUP(1, 1, BW_40), | |
196 | MCS_GROUP(2, 1, BW_40), | |
197 | MCS_GROUP(3, 1, BW_40), | |
198 | MCS_GROUP(4, 1, BW_40), | |
199 | ||
200 | CCK_GROUP, | |
201 | ||
202 | VHT_GROUP(1, 0, BW_20), | |
203 | VHT_GROUP(2, 0, BW_20), | |
204 | VHT_GROUP(3, 0, BW_20), | |
205 | VHT_GROUP(4, 0, BW_20), | |
206 | ||
207 | VHT_GROUP(1, 1, BW_20), | |
208 | VHT_GROUP(2, 1, BW_20), | |
209 | VHT_GROUP(3, 1, BW_20), | |
210 | VHT_GROUP(4, 1, BW_20), | |
211 | ||
212 | VHT_GROUP(1, 0, BW_40), | |
213 | VHT_GROUP(2, 0, BW_40), | |
214 | VHT_GROUP(3, 0, BW_40), | |
215 | VHT_GROUP(4, 0, BW_40), | |
216 | ||
217 | VHT_GROUP(1, 1, BW_40), | |
218 | VHT_GROUP(2, 1, BW_40), | |
219 | VHT_GROUP(3, 1, BW_40), | |
220 | VHT_GROUP(4, 1, BW_40), | |
221 | ||
222 | VHT_GROUP(1, 0, BW_80), | |
223 | VHT_GROUP(2, 0, BW_80), | |
224 | VHT_GROUP(3, 0, BW_80), | |
225 | VHT_GROUP(4, 0, BW_80), | |
226 | ||
227 | VHT_GROUP(1, 1, BW_80), | |
228 | VHT_GROUP(2, 1, BW_80), | |
229 | VHT_GROUP(3, 1, BW_80), | |
230 | VHT_GROUP(4, 1, BW_80), | |
9208247d | 231 | }; |
a0497f9f | 232 | |
f6e1a73b | 233 | static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly; |
ec8aa669 | 234 | |
a8566662 FF |
235 | static void |
236 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi); | |
237 | ||
9208247d KB |
238 | /* |
239 | * Some VHT MCSes are invalid (when Ndbps / Nes is not an integer) | |
240 | * e.g for MCS9@20MHzx1Nss: Ndbps=8x52*(5/6) Nes=1 | |
241 | * | |
242 | * Returns the valid mcs map for struct minstrel_mcs_group_data.supported | |
243 | */ | |
244 | static u16 | |
245 | minstrel_get_valid_vht_rates(int bw, int nss, __le16 mcs_map) | |
246 | { | |
247 | u16 mask = 0; | |
248 | ||
249 | if (bw == BW_20) { | |
250 | if (nss != 3 && nss != 6) | |
251 | mask = BIT(9); | |
252 | } else if (bw == BW_80) { | |
253 | if (nss == 3 || nss == 7) | |
254 | mask = BIT(6); | |
255 | else if (nss == 6) | |
256 | mask = BIT(9); | |
257 | } else { | |
258 | WARN_ON(bw != BW_40); | |
259 | } | |
260 | ||
261 | switch ((le16_to_cpu(mcs_map) >> (2 * (nss - 1))) & 3) { | |
262 | case IEEE80211_VHT_MCS_SUPPORT_0_7: | |
263 | mask |= 0x300; | |
264 | break; | |
265 | case IEEE80211_VHT_MCS_SUPPORT_0_8: | |
266 | mask |= 0x200; | |
267 | break; | |
268 | case IEEE80211_VHT_MCS_SUPPORT_0_9: | |
269 | break; | |
270 | default: | |
271 | mask = 0x3ff; | |
272 | } | |
273 | ||
274 | return 0x3ff & ~mask; | |
275 | } | |
276 | ||
ec8aa669 FF |
277 | /* |
278 | * Look up an MCS group index based on mac80211 rate information | |
279 | */ | |
280 | static int | |
281 | minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) | |
282 | { | |
cc61d8df | 283 | return GROUP_IDX((rate->idx / 8) + 1, |
a5f69d94 HS |
284 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
285 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); | |
ec8aa669 FF |
286 | } |
287 | ||
9208247d KB |
288 | static int |
289 | minstrel_vht_get_group_idx(struct ieee80211_tx_rate *rate) | |
290 | { | |
291 | return VHT_GROUP_IDX(ieee80211_rate_get_vht_nss(rate), | |
292 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), | |
293 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) + | |
294 | 2*!!(rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)); | |
295 | } | |
296 | ||
a0497f9f FF |
297 | static struct minstrel_rate_stats * |
298 | minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
299 | struct ieee80211_tx_rate *rate) | |
300 | { | |
301 | int group, idx; | |
302 | ||
303 | if (rate->flags & IEEE80211_TX_RC_MCS) { | |
304 | group = minstrel_ht_get_group_idx(rate); | |
7a5e3fa2 | 305 | idx = rate->idx % 8; |
9208247d KB |
306 | } else if (rate->flags & IEEE80211_TX_RC_VHT_MCS) { |
307 | group = minstrel_vht_get_group_idx(rate); | |
308 | idx = ieee80211_rate_get_vht_mcs(rate); | |
a0497f9f FF |
309 | } else { |
310 | group = MINSTREL_CCK_GROUP; | |
311 | ||
312 | for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) | |
313 | if (rate->idx == mp->cck_rates[idx]) | |
314 | break; | |
315 | ||
316 | /* short preamble */ | |
972b66b8 FF |
317 | if ((mi->supported[group] & BIT(idx + 4)) && |
318 | (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)) | |
a0497f9f FF |
319 | idx += 4; |
320 | } | |
321 | return &mi->groups[group].rates[idx]; | |
322 | } | |
323 | ||
ec8aa669 FF |
324 | static inline struct minstrel_rate_stats * |
325 | minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) | |
326 | { | |
327 | return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES]; | |
328 | } | |
329 | ||
77f7ffdc FF |
330 | static unsigned int |
331 | minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi) | |
332 | { | |
333 | if (!mi->avg_ampdu_len) | |
334 | return AVG_AMPDU_SIZE; | |
335 | ||
336 | return MINSTREL_TRUNC(mi->avg_ampdu_len); | |
337 | } | |
338 | ||
ec8aa669 | 339 | /* |
6a27b2c4 TH |
340 | * Return current throughput based on the average A-MPDU length, taking into |
341 | * account the expected number of retransmissions and their expected length | |
ec8aa669 | 342 | */ |
6a27b2c4 | 343 | int |
50e55a8e TH |
344 | minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate, |
345 | int prob_ewma) | |
ec8aa669 | 346 | { |
ed97a13c | 347 | unsigned int nsecs = 0; |
ec8aa669 | 348 | |
9134073b | 349 | /* do not account throughput if sucess prob is below 10% */ |
50e55a8e | 350 | if (prob_ewma < MINSTREL_FRAC(10, 100)) |
6a27b2c4 | 351 | return 0; |
ec8aa669 | 352 | |
a0497f9f | 353 | if (group != MINSTREL_CCK_GROUP) |
77f7ffdc | 354 | nsecs = 1000 * mi->overhead / minstrel_ht_avg_ampdu_len(mi); |
a0497f9f | 355 | |
202df504 FF |
356 | nsecs += minstrel_mcs_groups[group].duration[rate] << |
357 | minstrel_mcs_groups[group].shift; | |
ed97a13c | 358 | |
50e55a8e TH |
359 | /* |
360 | * For the throughput calculation, limit the probability value to 90% to | |
361 | * account for collision related packet error rate fluctuation | |
362 | * (prob is scaled - see MINSTREL_FRAC above) | |
363 | */ | |
364 | if (prob_ewma > MINSTREL_FRAC(90, 100)) | |
365 | return MINSTREL_TRUNC(100000 * ((MINSTREL_FRAC(90, 100) * 1000) | |
366 | / nsecs)); | |
367 | else | |
368 | return MINSTREL_TRUNC(100000 * ((prob_ewma * 1000) / nsecs)); | |
ec8aa669 FF |
369 | } |
370 | ||
5935839a TH |
371 | /* |
372 | * Find & sort topmost throughput rates | |
373 | * | |
374 | * If multiple rates provide equal throughput the sorting is based on their | |
375 | * current success probability. Higher success probability is preferred among | |
376 | * MCS groups, CCK rates do not provide aggregation and are therefore at last. | |
377 | */ | |
378 | static void | |
d4d141ca KB |
379 | minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index, |
380 | u16 *tp_list) | |
5935839a | 381 | { |
6a27b2c4 TH |
382 | int cur_group, cur_idx, cur_tp_avg, cur_prob; |
383 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; | |
5935839a TH |
384 | int j = MAX_THR_RATES; |
385 | ||
386 | cur_group = index / MCS_GROUP_RATES; | |
387 | cur_idx = index % MCS_GROUP_RATES; | |
9134073b | 388 | cur_prob = mi->groups[cur_group].rates[cur_idx].prob_ewma; |
50e55a8e | 389 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, cur_prob); |
5935839a | 390 | |
280ba51d | 391 | do { |
5935839a TH |
392 | tmp_group = tp_list[j - 1] / MCS_GROUP_RATES; |
393 | tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES; | |
9134073b | 394 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
50e55a8e TH |
395 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, |
396 | tmp_prob); | |
6a27b2c4 TH |
397 | if (cur_tp_avg < tmp_tp_avg || |
398 | (cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob)) | |
280ba51d FF |
399 | break; |
400 | j--; | |
401 | } while (j > 0); | |
5935839a TH |
402 | |
403 | if (j < MAX_THR_RATES - 1) { | |
404 | memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) * | |
405 | (MAX_THR_RATES - (j + 1)))); | |
406 | } | |
407 | if (j < MAX_THR_RATES) | |
408 | tp_list[j] = index; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Find and set the topmost probability rate per sta and per group | |
413 | */ | |
414 | static void | |
d4d141ca | 415 | minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 index) |
5935839a TH |
416 | { |
417 | struct minstrel_mcs_group_data *mg; | |
9134073b | 418 | struct minstrel_rate_stats *mrs; |
6a27b2c4 TH |
419 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
420 | int max_tp_group, cur_tp_avg, cur_group, cur_idx; | |
50e55a8e TH |
421 | int max_gpr_group, max_gpr_idx; |
422 | int max_gpr_tp_avg, max_gpr_prob; | |
5935839a | 423 | |
6a27b2c4 TH |
424 | cur_group = index / MCS_GROUP_RATES; |
425 | cur_idx = index % MCS_GROUP_RATES; | |
5935839a | 426 | mg = &mi->groups[index / MCS_GROUP_RATES]; |
9134073b | 427 | mrs = &mg->rates[index % MCS_GROUP_RATES]; |
5935839a TH |
428 | |
429 | tmp_group = mi->max_prob_rate / MCS_GROUP_RATES; | |
430 | tmp_idx = mi->max_prob_rate % MCS_GROUP_RATES; | |
9134073b | 431 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
50e55a8e | 432 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
5935839a TH |
433 | |
434 | /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from | |
435 | * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */ | |
436 | max_tp_group = mi->max_tp_rate[0] / MCS_GROUP_RATES; | |
437 | if((index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) && | |
438 | (max_tp_group != MINSTREL_CCK_GROUP)) | |
439 | return; | |
440 | ||
f84a9372 KK |
441 | max_gpr_group = mg->max_group_prob_rate / MCS_GROUP_RATES; |
442 | max_gpr_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; | |
443 | max_gpr_prob = mi->groups[max_gpr_group].rates[max_gpr_idx].prob_ewma; | |
444 | ||
9134073b | 445 | if (mrs->prob_ewma > MINSTREL_FRAC(75, 100)) { |
50e55a8e TH |
446 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, |
447 | mrs->prob_ewma); | |
6a27b2c4 | 448 | if (cur_tp_avg > tmp_tp_avg) |
5935839a | 449 | mi->max_prob_rate = index; |
6a27b2c4 | 450 | |
50e55a8e TH |
451 | max_gpr_tp_avg = minstrel_ht_get_tp_avg(mi, max_gpr_group, |
452 | max_gpr_idx, | |
453 | max_gpr_prob); | |
454 | if (cur_tp_avg > max_gpr_tp_avg) | |
5935839a TH |
455 | mg->max_group_prob_rate = index; |
456 | } else { | |
9134073b | 457 | if (mrs->prob_ewma > tmp_prob) |
5935839a | 458 | mi->max_prob_rate = index; |
f84a9372 | 459 | if (mrs->prob_ewma > max_gpr_prob) |
5935839a TH |
460 | mg->max_group_prob_rate = index; |
461 | } | |
462 | } | |
463 | ||
464 | ||
465 | /* | |
466 | * Assign new rate set per sta and use CCK rates only if the fastest | |
467 | * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted | |
468 | * rate sets where MCS and CCK rates are mixed, because CCK rates can | |
469 | * not use aggregation. | |
470 | */ | |
471 | static void | |
472 | minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi, | |
d4d141ca KB |
473 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], |
474 | u16 tmp_cck_tp_rate[MAX_THR_RATES]) | |
5935839a | 475 | { |
50e55a8e | 476 | unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob; |
5935839a TH |
477 | int i; |
478 | ||
479 | tmp_group = tmp_cck_tp_rate[0] / MCS_GROUP_RATES; | |
480 | tmp_idx = tmp_cck_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e TH |
481 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
482 | tmp_cck_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); | |
5935839a TH |
483 | |
484 | tmp_group = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES; | |
485 | tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e TH |
486 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
487 | tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); | |
5935839a TH |
488 | |
489 | if (tmp_cck_tp > tmp_mcs_tp) { | |
490 | for(i = 0; i < MAX_THR_RATES; i++) { | |
491 | minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i], | |
492 | tmp_mcs_tp_rate); | |
493 | } | |
494 | } | |
495 | ||
496 | } | |
497 | ||
498 | /* | |
499 | * Try to increase robustness of max_prob rate by decrease number of | |
500 | * streams if possible. | |
501 | */ | |
502 | static inline void | |
503 | minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi) | |
504 | { | |
505 | struct minstrel_mcs_group_data *mg; | |
50e55a8e | 506 | int tmp_max_streams, group, tmp_idx, tmp_prob; |
5935839a TH |
507 | int tmp_tp = 0; |
508 | ||
509 | tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / | |
510 | MCS_GROUP_RATES].streams; | |
511 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
512 | mg = &mi->groups[group]; | |
41d08583 | 513 | if (!mi->supported[group] || group == MINSTREL_CCK_GROUP) |
5935839a | 514 | continue; |
6a27b2c4 TH |
515 | |
516 | tmp_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; | |
50e55a8e | 517 | tmp_prob = mi->groups[group].rates[tmp_idx].prob_ewma; |
6a27b2c4 | 518 | |
50e55a8e | 519 | if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, tmp_idx, tmp_prob) && |
5935839a TH |
520 | (minstrel_mcs_groups[group].streams < tmp_max_streams)) { |
521 | mi->max_prob_rate = mg->max_group_prob_rate; | |
6a27b2c4 | 522 | tmp_tp = minstrel_ht_get_tp_avg(mi, group, |
50e55a8e TH |
523 | tmp_idx, |
524 | tmp_prob); | |
5935839a TH |
525 | } |
526 | } | |
527 | } | |
528 | ||
ec8aa669 FF |
529 | /* |
530 | * Update rate statistics and select new primary rates | |
531 | * | |
532 | * Rules for rate selection: | |
533 | * - max_prob_rate must use only one stream, as a tradeoff between delivery | |
534 | * probability and throughput during strong fluctuations | |
5935839a | 535 | * - as long as the max prob rate has a probability of more than 75%, pick |
ec8aa669 FF |
536 | * higher throughput rates, even if the probablity is a bit lower |
537 | */ | |
538 | static void | |
539 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
540 | { | |
541 | struct minstrel_mcs_group_data *mg; | |
9134073b | 542 | struct minstrel_rate_stats *mrs; |
50e55a8e | 543 | int group, i, j, cur_prob; |
d4d141ca KB |
544 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES]; |
545 | u16 tmp_cck_tp_rate[MAX_THR_RATES], index; | |
ec8aa669 FF |
546 | |
547 | if (mi->ampdu_packets > 0) { | |
77f7ffdc FF |
548 | if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN)) |
549 | mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, | |
550 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), | |
551 | EWMA_LEVEL); | |
552 | else | |
553 | mi->avg_ampdu_len = 0; | |
ec8aa669 FF |
554 | mi->ampdu_len = 0; |
555 | mi->ampdu_packets = 0; | |
556 | } | |
557 | ||
558 | mi->sample_slow = 0; | |
559 | mi->sample_count = 0; | |
ec8aa669 | 560 | |
5935839a TH |
561 | /* Initialize global rate indexes */ |
562 | for(j = 0; j < MAX_THR_RATES; j++){ | |
563 | tmp_mcs_tp_rate[j] = 0; | |
564 | tmp_cck_tp_rate[j] = 0; | |
565 | } | |
c2eb5b0f | 566 | |
5935839a TH |
567 | /* Find best rate sets within all MCS groups*/ |
568 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
ec8aa669 FF |
569 | |
570 | mg = &mi->groups[group]; | |
41d08583 | 571 | if (!mi->supported[group]) |
ec8aa669 FF |
572 | continue; |
573 | ||
ec8aa669 FF |
574 | mi->sample_count++; |
575 | ||
5935839a TH |
576 | /* (re)Initialize group rate indexes */ |
577 | for(j = 0; j < MAX_THR_RATES; j++) | |
578 | tmp_group_tp_rate[j] = group; | |
579 | ||
ec8aa669 | 580 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
41d08583 | 581 | if (!(mi->supported[group] & BIT(i))) |
ec8aa669 FF |
582 | continue; |
583 | ||
351df099 KB |
584 | index = MCS_GROUP_RATES * group + i; |
585 | ||
9134073b TH |
586 | mrs = &mg->rates[i]; |
587 | mrs->retry_updated = false; | |
588 | minstrel_calc_rate_stats(mrs); | |
50e55a8e | 589 | cur_prob = mrs->prob_ewma; |
ec8aa669 | 590 | |
50e55a8e | 591 | if (minstrel_ht_get_tp_avg(mi, group, i, cur_prob) == 0) |
ec8aa669 FF |
592 | continue; |
593 | ||
5935839a TH |
594 | /* Find max throughput rate set */ |
595 | if (group != MINSTREL_CCK_GROUP) { | |
596 | minstrel_ht_sort_best_tp_rates(mi, index, | |
597 | tmp_mcs_tp_rate); | |
598 | } else if (group == MINSTREL_CCK_GROUP) { | |
599 | minstrel_ht_sort_best_tp_rates(mi, index, | |
600 | tmp_cck_tp_rate); | |
ec8aa669 | 601 | } |
ec8aa669 | 602 | |
5935839a TH |
603 | /* Find max throughput rate set within a group */ |
604 | minstrel_ht_sort_best_tp_rates(mi, index, | |
605 | tmp_group_tp_rate); | |
ec8aa669 | 606 | |
5935839a TH |
607 | /* Find max probability rate per group and global */ |
608 | minstrel_ht_set_best_prob_rate(mi, index); | |
ec8aa669 FF |
609 | } |
610 | ||
5935839a TH |
611 | memcpy(mg->max_group_tp_rate, tmp_group_tp_rate, |
612 | sizeof(mg->max_group_tp_rate)); | |
ec8aa669 FF |
613 | } |
614 | ||
5935839a TH |
615 | /* Assign new rate set per sta */ |
616 | minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, tmp_cck_tp_rate); | |
617 | memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate)); | |
a299c6d5 | 618 | |
5935839a TH |
619 | /* Try to increase robustness of max_prob_rate*/ |
620 | minstrel_ht_prob_rate_reduce_streams(mi); | |
621 | ||
622 | /* try to sample all available rates during each interval */ | |
623 | mi->sample_count *= 8; | |
a299c6d5 | 624 | |
37feb7e2 LB |
625 | #ifdef CONFIG_MAC80211_DEBUGFS |
626 | /* use fixed index if set */ | |
627 | if (mp->fixed_rate_idx != -1) { | |
5935839a TH |
628 | for (i = 0; i < 4; i++) |
629 | mi->max_tp_rate[i] = mp->fixed_rate_idx; | |
37feb7e2 LB |
630 | mi->max_prob_rate = mp->fixed_rate_idx; |
631 | } | |
632 | #endif | |
a299c6d5 | 633 | |
5935839a | 634 | /* Reset update timer */ |
9134073b | 635 | mi->last_stats_update = jiffies; |
ec8aa669 FF |
636 | } |
637 | ||
638 | static bool | |
a0497f9f | 639 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
ec8aa669 | 640 | { |
b79296be | 641 | if (rate->idx < 0) |
ec8aa669 FF |
642 | return false; |
643 | ||
b79296be | 644 | if (!rate->count) |
ec8aa669 FF |
645 | return false; |
646 | ||
9208247d KB |
647 | if (rate->flags & IEEE80211_TX_RC_MCS || |
648 | rate->flags & IEEE80211_TX_RC_VHT_MCS) | |
a0497f9f FF |
649 | return true; |
650 | ||
651 | return rate->idx == mp->cck_rates[0] || | |
652 | rate->idx == mp->cck_rates[1] || | |
653 | rate->idx == mp->cck_rates[2] || | |
654 | rate->idx == mp->cck_rates[3]; | |
ec8aa669 FF |
655 | } |
656 | ||
657 | static void | |
9134073b | 658 | minstrel_set_next_sample_idx(struct minstrel_ht_sta *mi) |
ec8aa669 FF |
659 | { |
660 | struct minstrel_mcs_group_data *mg; | |
661 | ||
662 | for (;;) { | |
663 | mi->sample_group++; | |
664 | mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); | |
665 | mg = &mi->groups[mi->sample_group]; | |
666 | ||
41d08583 | 667 | if (!mi->supported[mi->sample_group]) |
ec8aa669 FF |
668 | continue; |
669 | ||
670 | if (++mg->index >= MCS_GROUP_RATES) { | |
671 | mg->index = 0; | |
672 | if (++mg->column >= ARRAY_SIZE(sample_table)) | |
673 | mg->column = 0; | |
674 | } | |
675 | break; | |
676 | } | |
677 | } | |
678 | ||
679 | static void | |
d4d141ca | 680 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u16 *idx, bool primary) |
ec8aa669 FF |
681 | { |
682 | int group, orig_group; | |
683 | ||
684 | orig_group = group = *idx / MCS_GROUP_RATES; | |
685 | while (group > 0) { | |
686 | group--; | |
687 | ||
41d08583 | 688 | if (!mi->supported[group]) |
ec8aa669 FF |
689 | continue; |
690 | ||
691 | if (minstrel_mcs_groups[group].streams > | |
692 | minstrel_mcs_groups[orig_group].streams) | |
693 | continue; | |
694 | ||
695 | if (primary) | |
5935839a | 696 | *idx = mi->groups[group].max_group_tp_rate[0]; |
ec8aa669 | 697 | else |
5935839a | 698 | *idx = mi->groups[group].max_group_tp_rate[1]; |
ec8aa669 FF |
699 | break; |
700 | } | |
701 | } | |
702 | ||
703 | static void | |
6048d763 | 704 | minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
ec8aa669 FF |
705 | { |
706 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
707 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
708 | u16 tid; | |
709 | ||
75769c80 FF |
710 | if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
711 | return; | |
712 | ||
ec8aa669 FF |
713 | if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) |
714 | return; | |
715 | ||
e133fae2 | 716 | if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) |
ec8aa669 FF |
717 | return; |
718 | ||
a1f2ba04 | 719 | tid = ieee80211_get_tid(hdr); |
a622ab72 | 720 | if (likely(sta->ampdu_mlme.tid_tx[tid])) |
ec8aa669 FF |
721 | return; |
722 | ||
7a36b930 | 723 | ieee80211_start_tx_ba_session(pubsta, tid, 0); |
ec8aa669 FF |
724 | } |
725 | ||
726 | static void | |
727 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, | |
18fb84d9 | 728 | void *priv_sta, struct ieee80211_tx_status *st) |
ec8aa669 | 729 | { |
18fb84d9 | 730 | struct ieee80211_tx_info *info = st->info; |
ec8aa669 FF |
731 | struct minstrel_ht_sta_priv *msp = priv_sta; |
732 | struct minstrel_ht_sta *mi = &msp->ht; | |
ec8aa669 FF |
733 | struct ieee80211_tx_rate *ar = info->status.rates; |
734 | struct minstrel_rate_stats *rate, *rate2; | |
735 | struct minstrel_priv *mp = priv; | |
a8566662 | 736 | bool last, update = false; |
a544ab7f | 737 | int i; |
ec8aa669 FF |
738 | |
739 | if (!msp->is_ht) | |
18fb84d9 FF |
740 | return mac80211_minstrel.tx_status_ext(priv, sband, |
741 | &msp->legacy, st); | |
ec8aa669 FF |
742 | |
743 | /* This packet was aggregated but doesn't carry status info */ | |
744 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
745 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
746 | return; | |
747 | ||
15d46f38 BS |
748 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
749 | info->status.ampdu_ack_len = | |
750 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); | |
ec8aa669 FF |
751 | info->status.ampdu_len = 1; |
752 | } | |
753 | ||
754 | mi->ampdu_packets++; | |
755 | mi->ampdu_len += info->status.ampdu_len; | |
756 | ||
757 | if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { | |
77f7ffdc FF |
758 | int avg_ampdu_len = minstrel_ht_avg_ampdu_len(mi); |
759 | ||
760 | mi->sample_wait = 16 + 2 * avg_ampdu_len; | |
52c00a37 | 761 | mi->sample_tries = 1; |
ec8aa669 FF |
762 | mi->sample_count--; |
763 | } | |
764 | ||
8d5eab5a | 765 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
ec8aa669 | 766 | mi->sample_packets += info->status.ampdu_len; |
ec8aa669 | 767 | |
a0497f9f | 768 | last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
ec8aa669 FF |
769 | for (i = 0; !last; i++) { |
770 | last = (i == IEEE80211_TX_MAX_RATES - 1) || | |
a0497f9f | 771 | !minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
ec8aa669 | 772 | |
a0497f9f | 773 | rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
ec8aa669 | 774 | |
15d46f38 | 775 | if (last) |
ec8aa669 FF |
776 | rate->success += info->status.ampdu_ack_len; |
777 | ||
778 | rate->attempts += ar[i].count * info->status.ampdu_len; | |
779 | } | |
780 | ||
781 | /* | |
782 | * check for sudden death of spatial multiplexing, | |
783 | * downgrade to a lower number of streams if necessary. | |
784 | */ | |
5935839a | 785 | rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]); |
ec8aa669 FF |
786 | if (rate->attempts > 30 && |
787 | MINSTREL_FRAC(rate->success, rate->attempts) < | |
a8566662 | 788 | MINSTREL_FRAC(20, 100)) { |
5935839a | 789 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true); |
a8566662 FF |
790 | update = true; |
791 | } | |
ec8aa669 | 792 | |
5935839a | 793 | rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]); |
ecc3d5ae ML |
794 | if (rate2->attempts > 30 && |
795 | MINSTREL_FRAC(rate2->success, rate2->attempts) < | |
a8566662 | 796 | MINSTREL_FRAC(20, 100)) { |
5935839a | 797 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false); |
a8566662 FF |
798 | update = true; |
799 | } | |
ec8aa669 | 800 | |
9134073b TH |
801 | if (time_after(jiffies, mi->last_stats_update + |
802 | (mp->update_interval / 2 * HZ) / 1000)) { | |
a8566662 | 803 | update = true; |
ec8aa669 | 804 | minstrel_ht_update_stats(mp, mi); |
ec8aa669 | 805 | } |
a8566662 FF |
806 | |
807 | if (update) | |
808 | minstrel_ht_update_rates(mp, mi); | |
ec8aa669 FF |
809 | } |
810 | ||
202df504 FF |
811 | static inline int |
812 | minstrel_get_duration(int index) | |
813 | { | |
814 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
815 | unsigned int duration = group->duration[index % MCS_GROUP_RATES]; | |
816 | return duration << group->shift; | |
817 | } | |
818 | ||
ec8aa669 FF |
819 | static void |
820 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
821 | int index) | |
822 | { | |
9134073b | 823 | struct minstrel_rate_stats *mrs; |
ec8aa669 FF |
824 | unsigned int tx_time, tx_time_rtscts, tx_time_data; |
825 | unsigned int cw = mp->cw_min; | |
8fddddff | 826 | unsigned int ctime = 0; |
ec8aa669 | 827 | unsigned int t_slot = 9; /* FIXME */ |
77f7ffdc | 828 | unsigned int ampdu_len = minstrel_ht_avg_ampdu_len(mi); |
a0497f9f | 829 | unsigned int overhead = 0, overhead_rtscts = 0; |
ec8aa669 | 830 | |
9134073b TH |
831 | mrs = minstrel_get_ratestats(mi, index); |
832 | if (mrs->prob_ewma < MINSTREL_FRAC(1, 10)) { | |
833 | mrs->retry_count = 1; | |
834 | mrs->retry_count_rtscts = 1; | |
ec8aa669 FF |
835 | return; |
836 | } | |
837 | ||
9134073b TH |
838 | mrs->retry_count = 2; |
839 | mrs->retry_count_rtscts = 2; | |
840 | mrs->retry_updated = true; | |
ec8aa669 | 841 | |
202df504 | 842 | tx_time_data = minstrel_get_duration(index) * ampdu_len / 1000; |
8fddddff DH |
843 | |
844 | /* Contention time for first 2 tries */ | |
845 | ctime = (t_slot * cw) >> 1; | |
846 | cw = min((cw << 1) | 1, mp->cw_max); | |
847 | ctime += (t_slot * cw) >> 1; | |
848 | cw = min((cw << 1) | 1, mp->cw_max); | |
849 | ||
a0497f9f FF |
850 | if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { |
851 | overhead = mi->overhead; | |
852 | overhead_rtscts = mi->overhead_rtscts; | |
853 | } | |
854 | ||
8fddddff | 855 | /* Total TX time for data and Contention after first 2 tries */ |
a0497f9f FF |
856 | tx_time = ctime + 2 * (overhead + tx_time_data); |
857 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); | |
8fddddff DH |
858 | |
859 | /* See how many more tries we can fit inside segment size */ | |
ec8aa669 | 860 | do { |
8fddddff DH |
861 | /* Contention time for this try */ |
862 | ctime = (t_slot * cw) >> 1; | |
863 | cw = min((cw << 1) | 1, mp->cw_max); | |
864 | ||
865 | /* Total TX time after this try */ | |
a0497f9f FF |
866 | tx_time += ctime + overhead + tx_time_data; |
867 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; | |
8fddddff | 868 | |
ec8aa669 | 869 | if (tx_time_rtscts < mp->segment_size) |
9134073b | 870 | mrs->retry_count_rtscts++; |
ec8aa669 | 871 | } while ((tx_time < mp->segment_size) && |
9134073b | 872 | (++mrs->retry_count < mp->max_retry)); |
ec8aa669 FF |
873 | } |
874 | ||
875 | ||
876 | static void | |
877 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
a8566662 | 878 | struct ieee80211_sta_rates *ratetbl, int offset, int index) |
ec8aa669 FF |
879 | { |
880 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
9134073b | 881 | struct minstrel_rate_stats *mrs; |
a8566662 | 882 | u8 idx; |
3ec373c4 | 883 | u16 flags = group->flags; |
ec8aa669 | 884 | |
9134073b TH |
885 | mrs = minstrel_get_ratestats(mi, index); |
886 | if (!mrs->retry_updated) | |
ec8aa669 FF |
887 | minstrel_calc_retransmit(mp, mi, index); |
888 | ||
9134073b | 889 | if (mrs->prob_ewma < MINSTREL_FRAC(20, 100) || !mrs->retry_count) { |
a8566662 FF |
890 | ratetbl->rate[offset].count = 2; |
891 | ratetbl->rate[offset].count_rts = 2; | |
892 | ratetbl->rate[offset].count_cts = 2; | |
893 | } else { | |
9134073b TH |
894 | ratetbl->rate[offset].count = mrs->retry_count; |
895 | ratetbl->rate[offset].count_cts = mrs->retry_count; | |
896 | ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts; | |
a8566662 | 897 | } |
a0497f9f | 898 | |
3ec373c4 | 899 | if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) |
a8566662 | 900 | idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
9208247d KB |
901 | else if (flags & IEEE80211_TX_RC_VHT_MCS) |
902 | idx = ((group->streams - 1) << 4) | | |
903 | ((index % MCS_GROUP_RATES) & 0xF); | |
3ec373c4 | 904 | else |
7a5e3fa2 | 905 | idx = index % MCS_GROUP_RATES + (group->streams - 1) * 8; |
a8566662 | 906 | |
a3ebb4e1 KC |
907 | /* enable RTS/CTS if needed: |
908 | * - if station is in dynamic SMPS (and streams > 1) | |
909 | * - for fallback rates, to increase chances of getting through | |
910 | */ | |
c36dd3ea | 911 | if (offset > 0 || |
a3ebb4e1 KC |
912 | (mi->sta->smps_mode == IEEE80211_SMPS_DYNAMIC && |
913 | group->streams > 1)) { | |
a8566662 FF |
914 | ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; |
915 | flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
916 | } | |
917 | ||
918 | ratetbl->rate[offset].idx = idx; | |
919 | ratetbl->rate[offset].flags = flags; | |
920 | } | |
921 | ||
918fe04b FF |
922 | static inline int |
923 | minstrel_ht_get_prob_ewma(struct minstrel_ht_sta *mi, int rate) | |
924 | { | |
925 | int group = rate / MCS_GROUP_RATES; | |
926 | rate %= MCS_GROUP_RATES; | |
927 | return mi->groups[group].rates[rate].prob_ewma; | |
928 | } | |
929 | ||
930 | static int | |
931 | minstrel_ht_get_max_amsdu_len(struct minstrel_ht_sta *mi) | |
932 | { | |
933 | int group = mi->max_prob_rate / MCS_GROUP_RATES; | |
934 | const struct mcs_group *g = &minstrel_mcs_groups[group]; | |
935 | int rate = mi->max_prob_rate % MCS_GROUP_RATES; | |
202df504 | 936 | unsigned int duration; |
918fe04b FF |
937 | |
938 | /* Disable A-MSDU if max_prob_rate is bad */ | |
939 | if (mi->groups[group].rates[rate].prob_ewma < MINSTREL_FRAC(50, 100)) | |
940 | return 1; | |
941 | ||
202df504 FF |
942 | duration = g->duration[rate]; |
943 | duration <<= g->shift; | |
944 | ||
918fe04b | 945 | /* If the rate is slower than single-stream MCS1, make A-MSDU limit small */ |
202df504 | 946 | if (duration > MCS_DURATION(1, 0, 52)) |
918fe04b FF |
947 | return 500; |
948 | ||
949 | /* | |
950 | * If the rate is slower than single-stream MCS4, limit A-MSDU to usual | |
951 | * data packet size | |
952 | */ | |
202df504 | 953 | if (duration > MCS_DURATION(1, 0, 104)) |
918fe04b FF |
954 | return 1600; |
955 | ||
956 | /* | |
957 | * If the rate is slower than single-stream MCS7, or if the max throughput | |
958 | * rate success probability is less than 75%, limit A-MSDU to twice the usual | |
959 | * data packet size | |
960 | */ | |
202df504 | 961 | if (duration > MCS_DURATION(1, 0, 260) || |
918fe04b FF |
962 | (minstrel_ht_get_prob_ewma(mi, mi->max_tp_rate[0]) < |
963 | MINSTREL_FRAC(75, 100))) | |
964 | return 3200; | |
965 | ||
966 | /* | |
967 | * HT A-MPDU limits maximum MPDU size under BA agreement to 4095 bytes. | |
968 | * Since aggregation sessions are started/stopped without txq flush, use | |
969 | * the limit here to avoid the complexity of having to de-aggregate | |
970 | * packets in the queue. | |
971 | */ | |
972 | if (!mi->sta->vht_cap.vht_supported) | |
973 | return IEEE80211_MAX_MPDU_LEN_HT_BA; | |
974 | ||
975 | /* unlimited */ | |
976 | return 0; | |
977 | } | |
978 | ||
a8566662 FF |
979 | static void |
980 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
981 | { | |
982 | struct ieee80211_sta_rates *rates; | |
983 | int i = 0; | |
984 | ||
985 | rates = kzalloc(sizeof(*rates), GFP_ATOMIC); | |
986 | if (!rates) | |
a0497f9f | 987 | return; |
a8566662 | 988 | |
5935839a TH |
989 | /* Start with max_tp_rate[0] */ |
990 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]); | |
a8566662 FF |
991 | |
992 | if (mp->hw->max_rates >= 3) { | |
5935839a TH |
993 | /* At least 3 tx rates supported, use max_tp_rate[1] next */ |
994 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]); | |
a8566662 FF |
995 | } |
996 | ||
997 | if (mp->hw->max_rates >= 2) { | |
a8566662 | 998 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); |
a0497f9f FF |
999 | } |
1000 | ||
918fe04b | 1001 | mi->sta->max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi); |
a8566662 FF |
1002 | rates->rate[i].idx = -1; |
1003 | rate_control_set_rates(mp->hw, mi->sta, rates); | |
ec8aa669 FF |
1004 | } |
1005 | ||
ec8aa669 FF |
1006 | static int |
1007 | minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
1008 | { | |
9134073b | 1009 | struct minstrel_rate_stats *mrs; |
ec8aa669 | 1010 | struct minstrel_mcs_group_data *mg; |
5935839a | 1011 | unsigned int sample_dur, sample_group, cur_max_tp_streams; |
06171e9c | 1012 | int tp_rate1, tp_rate2; |
ec8aa669 FF |
1013 | int sample_idx = 0; |
1014 | ||
1015 | if (mi->sample_wait > 0) { | |
1016 | mi->sample_wait--; | |
1017 | return -1; | |
1018 | } | |
1019 | ||
1020 | if (!mi->sample_tries) | |
1021 | return -1; | |
1022 | ||
f12140c0 KB |
1023 | sample_group = mi->sample_group; |
1024 | mg = &mi->groups[sample_group]; | |
ec8aa669 | 1025 | sample_idx = sample_table[mg->column][mg->index]; |
9134073b | 1026 | minstrel_set_next_sample_idx(mi); |
f12140c0 | 1027 | |
41d08583 | 1028 | if (!(mi->supported[sample_group] & BIT(sample_idx))) |
f12140c0 KB |
1029 | return -1; |
1030 | ||
9134073b | 1031 | mrs = &mg->rates[sample_idx]; |
965237ab | 1032 | sample_idx += sample_group * MCS_GROUP_RATES; |
ec8aa669 | 1033 | |
06171e9c FF |
1034 | /* Set tp_rate1, tp_rate2 to the highest / second highest max_tp_rate */ |
1035 | if (minstrel_get_duration(mi->max_tp_rate[0]) > | |
1036 | minstrel_get_duration(mi->max_tp_rate[1])) { | |
1037 | tp_rate1 = mi->max_tp_rate[1]; | |
1038 | tp_rate2 = mi->max_tp_rate[0]; | |
1039 | } else { | |
1040 | tp_rate1 = mi->max_tp_rate[0]; | |
1041 | tp_rate2 = mi->max_tp_rate[1]; | |
1042 | } | |
1043 | ||
ba6fa29c HS |
1044 | /* |
1045 | * Sampling might add some overhead (RTS, no aggregation) | |
06171e9c FF |
1046 | * to the frame. Hence, don't use sampling for the highest currently |
1047 | * used highest throughput or probability rate. | |
ba6fa29c | 1048 | */ |
06171e9c | 1049 | if (sample_idx == mi->max_tp_rate[0] || sample_idx == mi->max_prob_rate) |
ba6fa29c | 1050 | return -1; |
a0ca796c | 1051 | |
ec8aa669 | 1052 | /* |
f4ec7cb0 FF |
1053 | * Do not sample if the probability is already higher than 95%, |
1054 | * or if the rate is 3 times slower than the current max probability | |
1055 | * rate, to avoid wasting airtime. | |
ec8aa669 | 1056 | */ |
f4ec7cb0 FF |
1057 | sample_dur = minstrel_get_duration(sample_idx); |
1058 | if (mrs->prob_ewma > MINSTREL_FRAC(95, 100) || | |
1059 | minstrel_get_duration(mi->max_prob_rate) * 3 < sample_dur) | |
8d5eab5a | 1060 | return -1; |
ec8aa669 FF |
1061 | |
1062 | /* | |
1063 | * Make sure that lower rates get sampled only occasionally, | |
1064 | * if the link is working perfectly. | |
1065 | */ | |
5935839a | 1066 | |
06171e9c | 1067 | cur_max_tp_streams = minstrel_mcs_groups[tp_rate1 / |
5935839a | 1068 | MCS_GROUP_RATES].streams; |
06171e9c | 1069 | if (sample_dur >= minstrel_get_duration(tp_rate2) && |
5935839a | 1070 | (cur_max_tp_streams - 1 < |
965237ab FF |
1071 | minstrel_mcs_groups[sample_group].streams || |
1072 | sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { | |
9134073b | 1073 | if (mrs->sample_skipped < 20) |
8d5eab5a | 1074 | return -1; |
ec8aa669 FF |
1075 | |
1076 | if (mi->sample_slow++ > 2) | |
8d5eab5a | 1077 | return -1; |
ec8aa669 | 1078 | } |
098b8afb | 1079 | mi->sample_tries--; |
ec8aa669 FF |
1080 | |
1081 | return sample_idx; | |
ec8aa669 FF |
1082 | } |
1083 | ||
1084 | static void | |
1085 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, | |
1086 | struct ieee80211_tx_rate_control *txrc) | |
1087 | { | |
a8566662 | 1088 | const struct mcs_group *sample_group; |
ec8aa669 | 1089 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
a8566662 | 1090 | struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
ec8aa669 FF |
1091 | struct minstrel_ht_sta_priv *msp = priv_sta; |
1092 | struct minstrel_ht_sta *mi = &msp->ht; | |
1093 | struct minstrel_priv *mp = priv; | |
1094 | int sample_idx; | |
1095 | ||
1096 | if (rate_control_send_low(sta, priv_sta, txrc)) | |
1097 | return; | |
1098 | ||
1099 | if (!msp->is_ht) | |
1100 | return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); | |
1101 | ||
95943425 FF |
1102 | if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
1103 | mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) | |
1104 | minstrel_aggr_check(sta, txrc->skb); | |
1105 | ||
ec8aa669 | 1106 | info->flags |= mi->tx_flags; |
6de062ce | 1107 | |
37feb7e2 LB |
1108 | #ifdef CONFIG_MAC80211_DEBUGFS |
1109 | if (mp->fixed_rate_idx != -1) | |
1110 | return; | |
1111 | #endif | |
1112 | ||
6de062ce HS |
1113 | /* Don't use EAPOL frames for sampling on non-mrr hw */ |
1114 | if (mp->hw->max_rates == 1 && | |
af61a165 | 1115 | (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
6de062ce HS |
1116 | sample_idx = -1; |
1117 | else | |
1118 | sample_idx = minstrel_get_sample_rate(mp, mi); | |
24f7580e | 1119 | |
ec8aa669 FF |
1120 | mi->total_packets++; |
1121 | ||
1122 | /* wraparound */ | |
1123 | if (mi->total_packets == ~0) { | |
1124 | mi->total_packets = 0; | |
1125 | mi->sample_packets = 0; | |
1126 | } | |
a8566662 FF |
1127 | |
1128 | if (sample_idx < 0) | |
1129 | return; | |
1130 | ||
1131 | sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; | |
972b66b8 FF |
1132 | sample_idx %= MCS_GROUP_RATES; |
1133 | ||
1134 | if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP] && | |
1135 | (sample_idx >= 4) != txrc->short_preamble) | |
1136 | return; | |
1137 | ||
a8566662 | 1138 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
1cd15857 FF |
1139 | rate->count = 1; |
1140 | ||
972b66b8 | 1141 | if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP]) { |
1cd15857 FF |
1142 | int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); |
1143 | rate->idx = mp->cck_rates[idx]; | |
9208247d KB |
1144 | } else if (sample_group->flags & IEEE80211_TX_RC_VHT_MCS) { |
1145 | ieee80211_rate_set_vht(rate, sample_idx % MCS_GROUP_RATES, | |
1146 | sample_group->streams); | |
3ec373c4 | 1147 | } else { |
972b66b8 | 1148 | rate->idx = sample_idx + (sample_group->streams - 1) * 8; |
1cd15857 FF |
1149 | } |
1150 | ||
3ec373c4 | 1151 | rate->flags = sample_group->flags; |
ec8aa669 FF |
1152 | } |
1153 | ||
a0497f9f FF |
1154 | static void |
1155 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
1156 | struct ieee80211_supported_band *sband, | |
1157 | struct ieee80211_sta *sta) | |
1158 | { | |
1159 | int i; | |
1160 | ||
57fbcce3 | 1161 | if (sband->band != NL80211_BAND_2GHZ) |
a0497f9f FF |
1162 | return; |
1163 | ||
30686bf7 | 1164 | if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES)) |
2dfca312 FF |
1165 | return; |
1166 | ||
a0497f9f FF |
1167 | mi->cck_supported = 0; |
1168 | mi->cck_supported_short = 0; | |
1169 | for (i = 0; i < 4; i++) { | |
1170 | if (!rate_supported(sta, sband->band, mp->cck_rates[i])) | |
1171 | continue; | |
1172 | ||
1173 | mi->cck_supported |= BIT(i); | |
1174 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1175 | mi->cck_supported_short |= BIT(i); | |
1176 | } | |
1177 | ||
41d08583 | 1178 | mi->supported[MINSTREL_CCK_GROUP] = mi->cck_supported; |
a0497f9f FF |
1179 | } |
1180 | ||
ec8aa669 FF |
1181 | static void |
1182 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1183 | struct cfg80211_chan_def *chandef, |
64f68e5d | 1184 | struct ieee80211_sta *sta, void *priv_sta) |
ec8aa669 FF |
1185 | { |
1186 | struct minstrel_priv *mp = priv; | |
1187 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1188 | struct minstrel_ht_sta *mi = &msp->ht; | |
1189 | struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; | |
f458e832 | 1190 | u16 ht_cap = sta->ht_cap.cap; |
9208247d KB |
1191 | struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; |
1192 | int use_vht; | |
4dc217df | 1193 | int n_supported = 0; |
ec8aa669 FF |
1194 | int ack_dur; |
1195 | int stbc; | |
1196 | int i; | |
f458e832 | 1197 | bool ldpc; |
ec8aa669 FF |
1198 | |
1199 | /* fall back to the old minstrel for legacy stations */ | |
4dc217df FF |
1200 | if (!sta->ht_cap.ht_supported) |
1201 | goto use_legacy; | |
ec8aa669 | 1202 | |
8a0ee4fe | 1203 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB); |
ec8aa669 | 1204 | |
9208247d KB |
1205 | if (vht_cap->vht_supported) |
1206 | use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0); | |
1207 | else | |
b1c4f683 | 1208 | use_vht = 0; |
9208247d | 1209 | |
ec8aa669 FF |
1210 | msp->is_ht = true; |
1211 | memset(mi, 0, sizeof(*mi)); | |
a8566662 FF |
1212 | |
1213 | mi->sta = sta; | |
9134073b | 1214 | mi->last_stats_update = jiffies; |
ec8aa669 | 1215 | |
438b61b7 SW |
1216 | ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); |
1217 | mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); | |
1218 | mi->overhead += ack_dur; | |
ec8aa669 FF |
1219 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
1220 | ||
1221 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); | |
1222 | ||
1223 | /* When using MRR, sample more on the first attempt, without delay */ | |
1224 | if (mp->has_mrr) { | |
1225 | mi->sample_count = 16; | |
1226 | mi->sample_wait = 0; | |
1227 | } else { | |
1228 | mi->sample_count = 8; | |
1229 | mi->sample_wait = 8; | |
1230 | } | |
1231 | mi->sample_tries = 4; | |
1232 | ||
9208247d | 1233 | if (!use_vht) { |
f458e832 | 1234 | stbc = (ht_cap & IEEE80211_HT_CAP_RX_STBC) >> |
9208247d | 1235 | IEEE80211_HT_CAP_RX_STBC_SHIFT; |
ec8aa669 | 1236 | |
f458e832 C |
1237 | ldpc = ht_cap & IEEE80211_HT_CAP_LDPC_CODING; |
1238 | } else { | |
1239 | stbc = (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK) >> | |
1240 | IEEE80211_VHT_CAP_RXSTBC_SHIFT; | |
1241 | ||
1242 | ldpc = vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC; | |
9208247d | 1243 | } |
ec8aa669 | 1244 | |
f458e832 C |
1245 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; |
1246 | if (ldpc) | |
1247 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; | |
1248 | ||
ec8aa669 | 1249 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
3ec373c4 | 1250 | u32 gflags = minstrel_mcs_groups[i].flags; |
9208247d | 1251 | int bw, nss; |
3ec373c4 | 1252 | |
41d08583 | 1253 | mi->supported[i] = 0; |
a0497f9f FF |
1254 | if (i == MINSTREL_CCK_GROUP) { |
1255 | minstrel_ht_update_cck(mp, mi, sband, sta); | |
1256 | continue; | |
1257 | } | |
1258 | ||
3ec373c4 KB |
1259 | if (gflags & IEEE80211_TX_RC_SHORT_GI) { |
1260 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) { | |
f458e832 | 1261 | if (!(ht_cap & IEEE80211_HT_CAP_SGI_40)) |
e1a0c6b3 JB |
1262 | continue; |
1263 | } else { | |
f458e832 | 1264 | if (!(ht_cap & IEEE80211_HT_CAP_SGI_20)) |
e1a0c6b3 JB |
1265 | continue; |
1266 | } | |
ec8aa669 FF |
1267 | } |
1268 | ||
3ec373c4 | 1269 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
e1a0c6b3 | 1270 | sta->bandwidth < IEEE80211_STA_RX_BW_40) |
ec8aa669 FF |
1271 | continue; |
1272 | ||
9208247d KB |
1273 | nss = minstrel_mcs_groups[i].streams; |
1274 | ||
e9219779 | 1275 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
9208247d KB |
1276 | if (sta->smps_mode == IEEE80211_SMPS_STATIC && nss > 1) |
1277 | continue; | |
1278 | ||
1279 | /* HT rate */ | |
1280 | if (gflags & IEEE80211_TX_RC_MCS) { | |
9ffe9044 | 1281 | if (use_vht && minstrel_vht_only) |
9208247d | 1282 | continue; |
b1c4f683 | 1283 | |
41d08583 FF |
1284 | mi->supported[i] = mcs->rx_mask[nss - 1]; |
1285 | if (mi->supported[i]) | |
9208247d KB |
1286 | n_supported++; |
1287 | continue; | |
1288 | } | |
1289 | ||
1290 | /* VHT rate */ | |
1291 | if (!vht_cap->vht_supported || | |
1292 | WARN_ON(!(gflags & IEEE80211_TX_RC_VHT_MCS)) || | |
1293 | WARN_ON(gflags & IEEE80211_TX_RC_160_MHZ_WIDTH)) | |
e9219779 HS |
1294 | continue; |
1295 | ||
9208247d KB |
1296 | if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) { |
1297 | if (sta->bandwidth < IEEE80211_STA_RX_BW_80 || | |
1298 | ((gflags & IEEE80211_TX_RC_SHORT_GI) && | |
1299 | !(vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80))) { | |
1300 | continue; | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) | |
1305 | bw = BW_40; | |
1306 | else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) | |
1307 | bw = BW_80; | |
1308 | else | |
1309 | bw = BW_20; | |
1310 | ||
41d08583 | 1311 | mi->supported[i] = minstrel_get_valid_vht_rates(bw, nss, |
9208247d | 1312 | vht_cap->vht_mcs.tx_mcs_map); |
4dc217df | 1313 | |
41d08583 | 1314 | if (mi->supported[i]) |
4dc217df | 1315 | n_supported++; |
ec8aa669 | 1316 | } |
4dc217df FF |
1317 | |
1318 | if (!n_supported) | |
1319 | goto use_legacy; | |
1320 | ||
37439f2d | 1321 | mi->supported[MINSTREL_CCK_GROUP] |= mi->cck_supported_short << 4; |
782dda00 | 1322 | |
a8566662 | 1323 | /* create an initial rate table with the lowest supported rates */ |
a3647362 | 1324 | minstrel_ht_update_stats(mp, mi); |
a8566662 | 1325 | minstrel_ht_update_rates(mp, mi); |
a3647362 | 1326 | |
4dc217df FF |
1327 | return; |
1328 | ||
1329 | use_legacy: | |
1330 | msp->is_ht = false; | |
1331 | memset(&msp->legacy, 0, sizeof(msp->legacy)); | |
1332 | msp->legacy.r = msp->ratelist; | |
1333 | msp->legacy.sample_table = msp->sample_table; | |
3de805cf SW |
1334 | return mac80211_minstrel.rate_init(priv, sband, chandef, sta, |
1335 | &msp->legacy); | |
ec8aa669 FF |
1336 | } |
1337 | ||
1338 | static void | |
1339 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1340 | struct cfg80211_chan_def *chandef, |
ec8aa669 FF |
1341 | struct ieee80211_sta *sta, void *priv_sta) |
1342 | { | |
3de805cf | 1343 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1344 | } |
1345 | ||
1346 | static void | |
1347 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1348 | struct cfg80211_chan_def *chandef, |
ec8aa669 | 1349 | struct ieee80211_sta *sta, void *priv_sta, |
64f68e5d | 1350 | u32 changed) |
ec8aa669 | 1351 | { |
3de805cf | 1352 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1353 | } |
1354 | ||
1355 | static void * | |
1356 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) | |
1357 | { | |
1358 | struct ieee80211_supported_band *sband; | |
1359 | struct minstrel_ht_sta_priv *msp; | |
1360 | struct minstrel_priv *mp = priv; | |
1361 | struct ieee80211_hw *hw = mp->hw; | |
1362 | int max_rates = 0; | |
1363 | int i; | |
1364 | ||
57fbcce3 | 1365 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
ec8aa669 FF |
1366 | sband = hw->wiphy->bands[i]; |
1367 | if (sband && sband->n_bitrates > max_rates) | |
1368 | max_rates = sband->n_bitrates; | |
1369 | } | |
1370 | ||
472dd35c | 1371 | msp = kzalloc(sizeof(*msp), gfp); |
ec8aa669 FF |
1372 | if (!msp) |
1373 | return NULL; | |
1374 | ||
6396bb22 | 1375 | msp->ratelist = kcalloc(max_rates, sizeof(struct minstrel_rate), gfp); |
ec8aa669 FF |
1376 | if (!msp->ratelist) |
1377 | goto error; | |
1378 | ||
6da2ec56 | 1379 | msp->sample_table = kmalloc_array(max_rates, SAMPLE_COLUMNS, gfp); |
ec8aa669 FF |
1380 | if (!msp->sample_table) |
1381 | goto error1; | |
1382 | ||
1383 | return msp; | |
1384 | ||
1385 | error1: | |
7e988014 | 1386 | kfree(msp->ratelist); |
ec8aa669 FF |
1387 | error: |
1388 | kfree(msp); | |
1389 | return NULL; | |
1390 | } | |
1391 | ||
1392 | static void | |
1393 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) | |
1394 | { | |
1395 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1396 | ||
1397 | kfree(msp->sample_table); | |
1398 | kfree(msp->ratelist); | |
1399 | kfree(msp); | |
1400 | } | |
1401 | ||
b1c4f683 FF |
1402 | static void |
1403 | minstrel_ht_init_cck_rates(struct minstrel_priv *mp) | |
1404 | { | |
1405 | static const int bitrates[4] = { 10, 20, 55, 110 }; | |
1406 | struct ieee80211_supported_band *sband; | |
1407 | u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef); | |
1408 | int i, j; | |
1409 | ||
1410 | sband = mp->hw->wiphy->bands[NL80211_BAND_2GHZ]; | |
1411 | if (!sband) | |
1412 | return; | |
1413 | ||
1414 | for (i = 0; i < sband->n_bitrates; i++) { | |
1415 | struct ieee80211_rate *rate = &sband->bitrates[i]; | |
1416 | ||
1417 | if (rate->flags & IEEE80211_RATE_ERP_G) | |
1418 | continue; | |
1419 | ||
1420 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1421 | continue; | |
1422 | ||
1423 | for (j = 0; j < ARRAY_SIZE(bitrates); j++) { | |
1424 | if (rate->bitrate != bitrates[j]) | |
1425 | continue; | |
1426 | ||
1427 | mp->cck_rates[j] = i; | |
1428 | break; | |
1429 | } | |
1430 | } | |
1431 | } | |
1432 | ||
ec8aa669 FF |
1433 | static void * |
1434 | minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
1435 | { | |
b1c4f683 FF |
1436 | struct minstrel_priv *mp; |
1437 | ||
1438 | mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC); | |
1439 | if (!mp) | |
1440 | return NULL; | |
1441 | ||
1442 | /* contention window settings | |
1443 | * Just an approximation. Using the per-queue values would complicate | |
1444 | * the calculations and is probably unnecessary */ | |
1445 | mp->cw_min = 15; | |
1446 | mp->cw_max = 1023; | |
1447 | ||
1448 | /* number of packets (in %) to use for sampling other rates | |
1449 | * sample less often for non-mrr packets, because the overhead | |
1450 | * is much higher than with mrr */ | |
1451 | mp->lookaround_rate = 5; | |
1452 | mp->lookaround_rate_mrr = 10; | |
1453 | ||
1454 | /* maximum time that the hw is allowed to stay in one MRR segment */ | |
1455 | mp->segment_size = 6000; | |
1456 | ||
1457 | if (hw->max_rate_tries > 0) | |
1458 | mp->max_retry = hw->max_rate_tries; | |
1459 | else | |
1460 | /* safe default, does not necessarily have to match hw properties */ | |
1461 | mp->max_retry = 7; | |
1462 | ||
1463 | if (hw->max_rates >= 4) | |
1464 | mp->has_mrr = true; | |
1465 | ||
1466 | mp->hw = hw; | |
1467 | mp->update_interval = 100; | |
1468 | ||
1469 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1470 | mp->fixed_rate_idx = (u32) -1; | |
1471 | debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir, | |
1472 | &mp->fixed_rate_idx); | |
1473 | #endif | |
1474 | ||
1475 | minstrel_ht_init_cck_rates(mp); | |
1476 | ||
1477 | return mp; | |
ec8aa669 FF |
1478 | } |
1479 | ||
1480 | static void | |
1481 | minstrel_ht_free(void *priv) | |
1482 | { | |
b1c4f683 | 1483 | kfree(priv); |
ec8aa669 FF |
1484 | } |
1485 | ||
cca674d4 AQ |
1486 | static u32 minstrel_ht_get_expected_throughput(void *priv_sta) |
1487 | { | |
1488 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1489 | struct minstrel_ht_sta *mi = &msp->ht; | |
50e55a8e | 1490 | int i, j, prob, tp_avg; |
cca674d4 AQ |
1491 | |
1492 | if (!msp->is_ht) | |
1493 | return mac80211_minstrel.get_expected_throughput(priv_sta); | |
1494 | ||
5935839a TH |
1495 | i = mi->max_tp_rate[0] / MCS_GROUP_RATES; |
1496 | j = mi->max_tp_rate[0] % MCS_GROUP_RATES; | |
50e55a8e | 1497 | prob = mi->groups[i].rates[j].prob_ewma; |
cca674d4 | 1498 | |
6a27b2c4 | 1499 | /* convert tp_avg from pkt per second in kbps */ |
212c5a5e SE |
1500 | tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * 10; |
1501 | tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024; | |
6a27b2c4 TH |
1502 | |
1503 | return tp_avg; | |
cca674d4 AQ |
1504 | } |
1505 | ||
631ad703 | 1506 | static const struct rate_control_ops mac80211_minstrel_ht = { |
ec8aa669 | 1507 | .name = "minstrel_ht", |
18fb84d9 | 1508 | .tx_status_ext = minstrel_ht_tx_status, |
ec8aa669 FF |
1509 | .get_rate = minstrel_ht_get_rate, |
1510 | .rate_init = minstrel_ht_rate_init, | |
1511 | .rate_update = minstrel_ht_rate_update, | |
1512 | .alloc_sta = minstrel_ht_alloc_sta, | |
1513 | .free_sta = minstrel_ht_free_sta, | |
1514 | .alloc = minstrel_ht_alloc, | |
1515 | .free = minstrel_ht_free, | |
1516 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1517 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, | |
ec8aa669 | 1518 | #endif |
cca674d4 | 1519 | .get_expected_throughput = minstrel_ht_get_expected_throughput, |
ec8aa669 FF |
1520 | }; |
1521 | ||
1522 | ||
f6e1a73b | 1523 | static void __init init_sample_table(void) |
ec8aa669 FF |
1524 | { |
1525 | int col, i, new_idx; | |
1526 | u8 rnd[MCS_GROUP_RATES]; | |
1527 | ||
1528 | memset(sample_table, 0xff, sizeof(sample_table)); | |
1529 | for (col = 0; col < SAMPLE_COLUMNS; col++) { | |
f7d8ad81 | 1530 | prandom_bytes(rnd, sizeof(rnd)); |
ec8aa669 | 1531 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
ec8aa669 | 1532 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
ec8aa669 FF |
1533 | while (sample_table[col][new_idx] != 0xff) |
1534 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; | |
1535 | ||
1536 | sample_table[col][new_idx] = i; | |
1537 | } | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | int __init | |
b1c4f683 | 1542 | rc80211_minstrel_init(void) |
ec8aa669 FF |
1543 | { |
1544 | init_sample_table(); | |
1545 | return ieee80211_rate_control_register(&mac80211_minstrel_ht); | |
1546 | } | |
1547 | ||
1548 | void | |
b1c4f683 | 1549 | rc80211_minstrel_exit(void) |
ec8aa669 FF |
1550 | { |
1551 | ieee80211_rate_control_unregister(&mac80211_minstrel_ht); | |
1552 | } |