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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> | |
13 | #include <linux/ieee80211.h> | |
14 | #include <net/mac80211.h> | |
15 | #include "rate.h" | |
16 | #include "rc80211_minstrel.h" | |
17 | #include "rc80211_minstrel_ht.h" | |
18 | ||
19 | #define AVG_PKT_SIZE 1200 | |
ec8aa669 FF |
20 | |
21 | /* Number of bits for an average sized packet */ | |
22 | #define MCS_NBITS (AVG_PKT_SIZE << 3) | |
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 */ | |
35 | #define MCS_DURATION(streams, sgi, bps) MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) | |
36 | ||
a5f69d94 HS |
37 | /* |
38 | * Define group sort order: HT40 -> SGI -> #streams | |
39 | */ | |
40 | #define GROUP_IDX(_streams, _sgi, _ht40) \ | |
41 | MINSTREL_MAX_STREAMS * 2 * _ht40 + \ | |
42 | MINSTREL_MAX_STREAMS * _sgi + \ | |
43 | _streams - 1 | |
44 | ||
ec8aa669 | 45 | /* MCS rate information for an MCS group */ |
a5f69d94 HS |
46 | #define MCS_GROUP(_streams, _sgi, _ht40) \ |
47 | [GROUP_IDX(_streams, _sgi, _ht40)] = { \ | |
ec8aa669 FF |
48 | .streams = _streams, \ |
49 | .flags = \ | |
50 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ | |
51 | (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ | |
52 | .duration = { \ | |
53 | MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26), \ | |
54 | MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52), \ | |
55 | MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78), \ | |
56 | MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104), \ | |
57 | MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156), \ | |
58 | MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208), \ | |
59 | MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234), \ | |
60 | MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) \ | |
61 | } \ | |
62 | } | |
63 | ||
a0497f9f | 64 | #define CCK_DURATION(_bitrate, _short, _len) \ |
ed97a13c | 65 | (1000 * (10 /* SIFS */ + \ |
f359d3fe | 66 | (_short ? 72 + 24 : 144 + 48) + \ |
ed97a13c | 67 | (8 * (_len + 4) * 10) / (_bitrate))) |
a0497f9f FF |
68 | |
69 | #define CCK_ACK_DURATION(_bitrate, _short) \ | |
70 | (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \ | |
71 | CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE)) | |
72 | ||
73 | #define CCK_DURATION_LIST(_short) \ | |
74 | CCK_ACK_DURATION(10, _short), \ | |
75 | CCK_ACK_DURATION(20, _short), \ | |
76 | CCK_ACK_DURATION(55, _short), \ | |
77 | CCK_ACK_DURATION(110, _short) | |
78 | ||
79 | #define CCK_GROUP \ | |
80 | [MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS] = { \ | |
81 | .streams = 0, \ | |
82 | .duration = { \ | |
83 | CCK_DURATION_LIST(false), \ | |
84 | CCK_DURATION_LIST(true) \ | |
85 | } \ | |
86 | } | |
87 | ||
ec8aa669 FF |
88 | /* |
89 | * To enable sufficiently targeted rate sampling, MCS rates are divided into | |
90 | * groups, based on the number of streams and flags (HT40, SGI) that they | |
91 | * use. | |
a5f69d94 HS |
92 | * |
93 | * Sortorder has to be fixed for GROUP_IDX macro to be applicable: | |
94 | * HT40 -> SGI -> #streams | |
ec8aa669 FF |
95 | */ |
96 | const struct mcs_group minstrel_mcs_groups[] = { | |
97 | MCS_GROUP(1, 0, 0), | |
98 | MCS_GROUP(2, 0, 0), | |
99 | #if MINSTREL_MAX_STREAMS >= 3 | |
100 | MCS_GROUP(3, 0, 0), | |
101 | #endif | |
102 | ||
103 | MCS_GROUP(1, 1, 0), | |
104 | MCS_GROUP(2, 1, 0), | |
105 | #if MINSTREL_MAX_STREAMS >= 3 | |
106 | MCS_GROUP(3, 1, 0), | |
107 | #endif | |
108 | ||
109 | MCS_GROUP(1, 0, 1), | |
110 | MCS_GROUP(2, 0, 1), | |
111 | #if MINSTREL_MAX_STREAMS >= 3 | |
112 | MCS_GROUP(3, 0, 1), | |
113 | #endif | |
114 | ||
115 | MCS_GROUP(1, 1, 1), | |
116 | MCS_GROUP(2, 1, 1), | |
117 | #if MINSTREL_MAX_STREAMS >= 3 | |
118 | MCS_GROUP(3, 1, 1), | |
119 | #endif | |
a0497f9f FF |
120 | |
121 | /* must be last */ | |
122 | CCK_GROUP | |
ec8aa669 FF |
123 | }; |
124 | ||
a0497f9f FF |
125 | #define MINSTREL_CCK_GROUP (ARRAY_SIZE(minstrel_mcs_groups) - 1) |
126 | ||
f6e1a73b | 127 | static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly; |
ec8aa669 | 128 | |
a8566662 FF |
129 | static void |
130 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi); | |
131 | ||
ec8aa669 FF |
132 | /* |
133 | * Look up an MCS group index based on mac80211 rate information | |
134 | */ | |
135 | static int | |
136 | minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) | |
137 | { | |
5935839a | 138 | return GROUP_IDX((rate->idx / MCS_GROUP_RATES) + 1, |
a5f69d94 HS |
139 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
140 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); | |
ec8aa669 FF |
141 | } |
142 | ||
a0497f9f FF |
143 | static struct minstrel_rate_stats * |
144 | minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
145 | struct ieee80211_tx_rate *rate) | |
146 | { | |
147 | int group, idx; | |
148 | ||
149 | if (rate->flags & IEEE80211_TX_RC_MCS) { | |
150 | group = minstrel_ht_get_group_idx(rate); | |
7a5e3fa2 | 151 | idx = rate->idx % 8; |
a0497f9f FF |
152 | } else { |
153 | group = MINSTREL_CCK_GROUP; | |
154 | ||
155 | for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) | |
156 | if (rate->idx == mp->cck_rates[idx]) | |
157 | break; | |
158 | ||
159 | /* short preamble */ | |
160 | if (!(mi->groups[group].supported & BIT(idx))) | |
161 | idx += 4; | |
162 | } | |
163 | return &mi->groups[group].rates[idx]; | |
164 | } | |
165 | ||
ec8aa669 FF |
166 | static inline struct minstrel_rate_stats * |
167 | minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) | |
168 | { | |
169 | return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES]; | |
170 | } | |
171 | ||
172 | ||
173 | /* | |
174 | * Recalculate success probabilities and counters for a rate using EWMA | |
175 | */ | |
176 | static void | |
6048d763 | 177 | minstrel_calc_rate_ewma(struct minstrel_rate_stats *mr) |
ec8aa669 FF |
178 | { |
179 | if (unlikely(mr->attempts > 0)) { | |
180 | mr->sample_skipped = 0; | |
181 | mr->cur_prob = MINSTREL_FRAC(mr->success, mr->attempts); | |
182 | if (!mr->att_hist) | |
183 | mr->probability = mr->cur_prob; | |
184 | else | |
185 | mr->probability = minstrel_ewma(mr->probability, | |
186 | mr->cur_prob, EWMA_LEVEL); | |
187 | mr->att_hist += mr->attempts; | |
188 | mr->succ_hist += mr->success; | |
189 | } else { | |
190 | mr->sample_skipped++; | |
191 | } | |
192 | mr->last_success = mr->success; | |
193 | mr->last_attempts = mr->attempts; | |
194 | mr->success = 0; | |
195 | mr->attempts = 0; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Calculate throughput based on the average A-MPDU length, taking into account | |
200 | * the expected number of retransmissions and their expected length | |
201 | */ | |
202 | static void | |
6048d763 | 203 | minstrel_ht_calc_tp(struct minstrel_ht_sta *mi, int group, int rate) |
ec8aa669 FF |
204 | { |
205 | struct minstrel_rate_stats *mr; | |
ed97a13c FF |
206 | unsigned int nsecs = 0; |
207 | unsigned int tp; | |
3e8b1eb2 | 208 | unsigned int prob; |
ec8aa669 FF |
209 | |
210 | mr = &mi->groups[group].rates[rate]; | |
3e8b1eb2 | 211 | prob = mr->probability; |
ec8aa669 | 212 | |
3e8b1eb2 | 213 | if (prob < MINSTREL_FRAC(1, 10)) { |
ec8aa669 FF |
214 | mr->cur_tp = 0; |
215 | return; | |
216 | } | |
217 | ||
3e8b1eb2 FF |
218 | /* |
219 | * For the throughput calculation, limit the probability value to 90% to | |
220 | * account for collision related packet error rate fluctuation | |
221 | */ | |
222 | if (prob > MINSTREL_FRAC(9, 10)) | |
223 | prob = MINSTREL_FRAC(9, 10); | |
224 | ||
a0497f9f | 225 | if (group != MINSTREL_CCK_GROUP) |
ed97a13c | 226 | nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len); |
a0497f9f | 227 | |
ed97a13c | 228 | nsecs += minstrel_mcs_groups[group].duration[rate]; |
ed97a13c | 229 | |
00591cea JB |
230 | /* prob is scaled - see MINSTREL_FRAC above */ |
231 | tp = 1000000 * ((prob * 1000) / nsecs); | |
ed97a13c | 232 | mr->cur_tp = MINSTREL_TRUNC(tp); |
ec8aa669 FF |
233 | } |
234 | ||
5935839a TH |
235 | /* |
236 | * Find & sort topmost throughput rates | |
237 | * | |
238 | * If multiple rates provide equal throughput the sorting is based on their | |
239 | * current success probability. Higher success probability is preferred among | |
240 | * MCS groups, CCK rates do not provide aggregation and are therefore at last. | |
241 | */ | |
242 | static void | |
243 | minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u8 index, | |
244 | u8 *tp_list) | |
245 | { | |
246 | int cur_group, cur_idx, cur_thr, cur_prob; | |
247 | int tmp_group, tmp_idx, tmp_thr, tmp_prob; | |
248 | int j = MAX_THR_RATES; | |
249 | ||
250 | cur_group = index / MCS_GROUP_RATES; | |
251 | cur_idx = index % MCS_GROUP_RATES; | |
252 | cur_thr = mi->groups[cur_group].rates[cur_idx].cur_tp; | |
253 | cur_prob = mi->groups[cur_group].rates[cur_idx].probability; | |
254 | ||
280ba51d | 255 | do { |
5935839a TH |
256 | tmp_group = tp_list[j - 1] / MCS_GROUP_RATES; |
257 | tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES; | |
258 | tmp_thr = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
259 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].probability; | |
280ba51d FF |
260 | if (cur_thr < tmp_thr || |
261 | (cur_thr == tmp_thr && cur_prob <= tmp_prob)) | |
262 | break; | |
263 | j--; | |
264 | } while (j > 0); | |
5935839a TH |
265 | |
266 | if (j < MAX_THR_RATES - 1) { | |
267 | memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) * | |
268 | (MAX_THR_RATES - (j + 1)))); | |
269 | } | |
270 | if (j < MAX_THR_RATES) | |
271 | tp_list[j] = index; | |
272 | } | |
273 | ||
274 | /* | |
275 | * Find and set the topmost probability rate per sta and per group | |
276 | */ | |
277 | static void | |
278 | minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u8 index) | |
279 | { | |
280 | struct minstrel_mcs_group_data *mg; | |
281 | struct minstrel_rate_stats *mr; | |
282 | int tmp_group, tmp_idx, tmp_tp, tmp_prob, max_tp_group; | |
283 | ||
284 | mg = &mi->groups[index / MCS_GROUP_RATES]; | |
285 | mr = &mg->rates[index % MCS_GROUP_RATES]; | |
286 | ||
287 | tmp_group = mi->max_prob_rate / MCS_GROUP_RATES; | |
288 | tmp_idx = mi->max_prob_rate % MCS_GROUP_RATES; | |
289 | tmp_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
290 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].probability; | |
291 | ||
292 | /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from | |
293 | * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */ | |
294 | max_tp_group = mi->max_tp_rate[0] / MCS_GROUP_RATES; | |
295 | if((index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) && | |
296 | (max_tp_group != MINSTREL_CCK_GROUP)) | |
297 | return; | |
298 | ||
299 | if (mr->probability > MINSTREL_FRAC(75, 100)) { | |
300 | if (mr->cur_tp > tmp_tp) | |
301 | mi->max_prob_rate = index; | |
302 | if (mr->cur_tp > mg->rates[mg->max_group_prob_rate].cur_tp) | |
303 | mg->max_group_prob_rate = index; | |
304 | } else { | |
305 | if (mr->probability > tmp_prob) | |
306 | mi->max_prob_rate = index; | |
307 | if (mr->probability > mg->rates[mg->max_group_prob_rate].probability) | |
308 | mg->max_group_prob_rate = index; | |
309 | } | |
310 | } | |
311 | ||
312 | ||
313 | /* | |
314 | * Assign new rate set per sta and use CCK rates only if the fastest | |
315 | * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted | |
316 | * rate sets where MCS and CCK rates are mixed, because CCK rates can | |
317 | * not use aggregation. | |
318 | */ | |
319 | static void | |
320 | minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi, | |
321 | u8 tmp_mcs_tp_rate[MAX_THR_RATES], | |
322 | u8 tmp_cck_tp_rate[MAX_THR_RATES]) | |
323 | { | |
324 | unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp; | |
325 | int i; | |
326 | ||
327 | tmp_group = tmp_cck_tp_rate[0] / MCS_GROUP_RATES; | |
328 | tmp_idx = tmp_cck_tp_rate[0] % MCS_GROUP_RATES; | |
329 | tmp_cck_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
330 | ||
331 | tmp_group = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES; | |
332 | tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES; | |
333 | tmp_mcs_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
334 | ||
335 | if (tmp_cck_tp > tmp_mcs_tp) { | |
336 | for(i = 0; i < MAX_THR_RATES; i++) { | |
337 | minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i], | |
338 | tmp_mcs_tp_rate); | |
339 | } | |
340 | } | |
341 | ||
342 | } | |
343 | ||
344 | /* | |
345 | * Try to increase robustness of max_prob rate by decrease number of | |
346 | * streams if possible. | |
347 | */ | |
348 | static inline void | |
349 | minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi) | |
350 | { | |
351 | struct minstrel_mcs_group_data *mg; | |
352 | struct minstrel_rate_stats *mr; | |
353 | int tmp_max_streams, group; | |
354 | int tmp_tp = 0; | |
355 | ||
356 | tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / | |
357 | MCS_GROUP_RATES].streams; | |
358 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
359 | mg = &mi->groups[group]; | |
360 | if (!mg->supported || group == MINSTREL_CCK_GROUP) | |
361 | continue; | |
362 | mr = minstrel_get_ratestats(mi, mg->max_group_prob_rate); | |
363 | if (tmp_tp < mr->cur_tp && | |
364 | (minstrel_mcs_groups[group].streams < tmp_max_streams)) { | |
365 | mi->max_prob_rate = mg->max_group_prob_rate; | |
366 | tmp_tp = mr->cur_tp; | |
367 | } | |
368 | } | |
369 | } | |
370 | ||
ec8aa669 FF |
371 | /* |
372 | * Update rate statistics and select new primary rates | |
373 | * | |
374 | * Rules for rate selection: | |
375 | * - max_prob_rate must use only one stream, as a tradeoff between delivery | |
376 | * probability and throughput during strong fluctuations | |
5935839a | 377 | * - as long as the max prob rate has a probability of more than 75%, pick |
ec8aa669 FF |
378 | * higher throughput rates, even if the probablity is a bit lower |
379 | */ | |
380 | static void | |
381 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
382 | { | |
383 | struct minstrel_mcs_group_data *mg; | |
384 | struct minstrel_rate_stats *mr; | |
5935839a TH |
385 | int group, i, j; |
386 | u8 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES]; | |
387 | u8 tmp_cck_tp_rate[MAX_THR_RATES], index; | |
ec8aa669 FF |
388 | |
389 | if (mi->ampdu_packets > 0) { | |
390 | mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, | |
391 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL); | |
392 | mi->ampdu_len = 0; | |
393 | mi->ampdu_packets = 0; | |
394 | } | |
395 | ||
396 | mi->sample_slow = 0; | |
397 | mi->sample_count = 0; | |
ec8aa669 | 398 | |
5935839a TH |
399 | /* Initialize global rate indexes */ |
400 | for(j = 0; j < MAX_THR_RATES; j++){ | |
401 | tmp_mcs_tp_rate[j] = 0; | |
402 | tmp_cck_tp_rate[j] = 0; | |
403 | } | |
c2eb5b0f | 404 | |
5935839a TH |
405 | /* Find best rate sets within all MCS groups*/ |
406 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
ec8aa669 FF |
407 | |
408 | mg = &mi->groups[group]; | |
409 | if (!mg->supported) | |
410 | continue; | |
411 | ||
ec8aa669 FF |
412 | mi->sample_count++; |
413 | ||
5935839a TH |
414 | /* (re)Initialize group rate indexes */ |
415 | for(j = 0; j < MAX_THR_RATES; j++) | |
416 | tmp_group_tp_rate[j] = group; | |
417 | ||
ec8aa669 FF |
418 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
419 | if (!(mg->supported & BIT(i))) | |
420 | continue; | |
421 | ||
351df099 KB |
422 | index = MCS_GROUP_RATES * group + i; |
423 | ||
ec8aa669 FF |
424 | mr = &mg->rates[i]; |
425 | mr->retry_updated = false; | |
6048d763 PK |
426 | minstrel_calc_rate_ewma(mr); |
427 | minstrel_ht_calc_tp(mi, group, i); | |
ec8aa669 FF |
428 | |
429 | if (!mr->cur_tp) | |
430 | continue; | |
431 | ||
5935839a TH |
432 | /* Find max throughput rate set */ |
433 | if (group != MINSTREL_CCK_GROUP) { | |
434 | minstrel_ht_sort_best_tp_rates(mi, index, | |
435 | tmp_mcs_tp_rate); | |
436 | } else if (group == MINSTREL_CCK_GROUP) { | |
437 | minstrel_ht_sort_best_tp_rates(mi, index, | |
438 | tmp_cck_tp_rate); | |
ec8aa669 | 439 | } |
ec8aa669 | 440 | |
5935839a TH |
441 | /* Find max throughput rate set within a group */ |
442 | minstrel_ht_sort_best_tp_rates(mi, index, | |
443 | tmp_group_tp_rate); | |
ec8aa669 | 444 | |
5935839a TH |
445 | /* Find max probability rate per group and global */ |
446 | minstrel_ht_set_best_prob_rate(mi, index); | |
ec8aa669 FF |
447 | } |
448 | ||
5935839a TH |
449 | memcpy(mg->max_group_tp_rate, tmp_group_tp_rate, |
450 | sizeof(mg->max_group_tp_rate)); | |
ec8aa669 FF |
451 | } |
452 | ||
5935839a TH |
453 | /* Assign new rate set per sta */ |
454 | minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, tmp_cck_tp_rate); | |
455 | memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate)); | |
a299c6d5 | 456 | |
5935839a TH |
457 | /* Try to increase robustness of max_prob_rate*/ |
458 | minstrel_ht_prob_rate_reduce_streams(mi); | |
459 | ||
460 | /* try to sample all available rates during each interval */ | |
461 | mi->sample_count *= 8; | |
a299c6d5 | 462 | |
37feb7e2 LB |
463 | #ifdef CONFIG_MAC80211_DEBUGFS |
464 | /* use fixed index if set */ | |
465 | if (mp->fixed_rate_idx != -1) { | |
5935839a TH |
466 | for (i = 0; i < 4; i++) |
467 | mi->max_tp_rate[i] = mp->fixed_rate_idx; | |
37feb7e2 LB |
468 | mi->max_prob_rate = mp->fixed_rate_idx; |
469 | } | |
470 | #endif | |
a299c6d5 | 471 | |
5935839a | 472 | /* Reset update timer */ |
ec8aa669 FF |
473 | mi->stats_update = jiffies; |
474 | } | |
475 | ||
476 | static bool | |
a0497f9f | 477 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
ec8aa669 | 478 | { |
b79296be | 479 | if (rate->idx < 0) |
ec8aa669 FF |
480 | return false; |
481 | ||
b79296be | 482 | if (!rate->count) |
ec8aa669 FF |
483 | return false; |
484 | ||
a0497f9f FF |
485 | if (rate->flags & IEEE80211_TX_RC_MCS) |
486 | return true; | |
487 | ||
488 | return rate->idx == mp->cck_rates[0] || | |
489 | rate->idx == mp->cck_rates[1] || | |
490 | rate->idx == mp->cck_rates[2] || | |
491 | rate->idx == mp->cck_rates[3]; | |
ec8aa669 FF |
492 | } |
493 | ||
494 | static void | |
495 | minstrel_next_sample_idx(struct minstrel_ht_sta *mi) | |
496 | { | |
497 | struct minstrel_mcs_group_data *mg; | |
498 | ||
499 | for (;;) { | |
500 | mi->sample_group++; | |
501 | mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); | |
502 | mg = &mi->groups[mi->sample_group]; | |
503 | ||
504 | if (!mg->supported) | |
505 | continue; | |
506 | ||
507 | if (++mg->index >= MCS_GROUP_RATES) { | |
508 | mg->index = 0; | |
509 | if (++mg->column >= ARRAY_SIZE(sample_table)) | |
510 | mg->column = 0; | |
511 | } | |
512 | break; | |
513 | } | |
514 | } | |
515 | ||
516 | static void | |
5935839a | 517 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u8 *idx, bool primary) |
ec8aa669 FF |
518 | { |
519 | int group, orig_group; | |
520 | ||
521 | orig_group = group = *idx / MCS_GROUP_RATES; | |
522 | while (group > 0) { | |
523 | group--; | |
524 | ||
525 | if (!mi->groups[group].supported) | |
526 | continue; | |
527 | ||
528 | if (minstrel_mcs_groups[group].streams > | |
529 | minstrel_mcs_groups[orig_group].streams) | |
530 | continue; | |
531 | ||
532 | if (primary) | |
5935839a | 533 | *idx = mi->groups[group].max_group_tp_rate[0]; |
ec8aa669 | 534 | else |
5935839a | 535 | *idx = mi->groups[group].max_group_tp_rate[1]; |
ec8aa669 FF |
536 | break; |
537 | } | |
538 | } | |
539 | ||
540 | static void | |
6048d763 | 541 | minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
ec8aa669 FF |
542 | { |
543 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
544 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
545 | u16 tid; | |
546 | ||
547 | if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) | |
548 | return; | |
549 | ||
e133fae2 | 550 | if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) |
ec8aa669 FF |
551 | return; |
552 | ||
553 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
a622ab72 | 554 | if (likely(sta->ampdu_mlme.tid_tx[tid])) |
ec8aa669 FF |
555 | return; |
556 | ||
48124d1a LR |
557 | if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
558 | return; | |
559 | ||
bd2ce6e4 | 560 | ieee80211_start_tx_ba_session(pubsta, tid, 5000); |
ec8aa669 FF |
561 | } |
562 | ||
563 | static void | |
564 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, | |
565 | struct ieee80211_sta *sta, void *priv_sta, | |
566 | struct sk_buff *skb) | |
567 | { | |
568 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
569 | struct minstrel_ht_sta *mi = &msp->ht; | |
570 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
571 | struct ieee80211_tx_rate *ar = info->status.rates; | |
572 | struct minstrel_rate_stats *rate, *rate2; | |
573 | struct minstrel_priv *mp = priv; | |
a8566662 | 574 | bool last, update = false; |
a544ab7f | 575 | int i; |
ec8aa669 FF |
576 | |
577 | if (!msp->is_ht) | |
578 | return mac80211_minstrel.tx_status(priv, sband, sta, &msp->legacy, skb); | |
579 | ||
580 | /* This packet was aggregated but doesn't carry status info */ | |
581 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
582 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
583 | return; | |
584 | ||
15d46f38 BS |
585 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
586 | info->status.ampdu_ack_len = | |
587 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); | |
ec8aa669 FF |
588 | info->status.ampdu_len = 1; |
589 | } | |
590 | ||
591 | mi->ampdu_packets++; | |
592 | mi->ampdu_len += info->status.ampdu_len; | |
593 | ||
594 | if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { | |
c7317e41 | 595 | mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len); |
52c00a37 | 596 | mi->sample_tries = 1; |
ec8aa669 FF |
597 | mi->sample_count--; |
598 | } | |
599 | ||
8d5eab5a | 600 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
ec8aa669 | 601 | mi->sample_packets += info->status.ampdu_len; |
ec8aa669 | 602 | |
a0497f9f | 603 | last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
ec8aa669 FF |
604 | for (i = 0; !last; i++) { |
605 | last = (i == IEEE80211_TX_MAX_RATES - 1) || | |
a0497f9f | 606 | !minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
ec8aa669 | 607 | |
a0497f9f | 608 | rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
ec8aa669 | 609 | |
15d46f38 | 610 | if (last) |
ec8aa669 FF |
611 | rate->success += info->status.ampdu_ack_len; |
612 | ||
613 | rate->attempts += ar[i].count * info->status.ampdu_len; | |
614 | } | |
615 | ||
616 | /* | |
617 | * check for sudden death of spatial multiplexing, | |
618 | * downgrade to a lower number of streams if necessary. | |
619 | */ | |
5935839a | 620 | rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]); |
ec8aa669 FF |
621 | if (rate->attempts > 30 && |
622 | MINSTREL_FRAC(rate->success, rate->attempts) < | |
a8566662 | 623 | MINSTREL_FRAC(20, 100)) { |
5935839a | 624 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true); |
a8566662 FF |
625 | update = true; |
626 | } | |
ec8aa669 | 627 | |
5935839a | 628 | rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]); |
ecc3d5ae ML |
629 | if (rate2->attempts > 30 && |
630 | MINSTREL_FRAC(rate2->success, rate2->attempts) < | |
a8566662 | 631 | MINSTREL_FRAC(20, 100)) { |
5935839a | 632 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false); |
a8566662 FF |
633 | update = true; |
634 | } | |
ec8aa669 FF |
635 | |
636 | if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) { | |
a8566662 | 637 | update = true; |
ec8aa669 | 638 | minstrel_ht_update_stats(mp, mi); |
a0497f9f FF |
639 | if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
640 | mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) | |
6048d763 | 641 | minstrel_aggr_check(sta, skb); |
ec8aa669 | 642 | } |
a8566662 FF |
643 | |
644 | if (update) | |
645 | minstrel_ht_update_rates(mp, mi); | |
ec8aa669 FF |
646 | } |
647 | ||
648 | static void | |
649 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
650 | int index) | |
651 | { | |
652 | struct minstrel_rate_stats *mr; | |
653 | const struct mcs_group *group; | |
654 | unsigned int tx_time, tx_time_rtscts, tx_time_data; | |
655 | unsigned int cw = mp->cw_min; | |
8fddddff | 656 | unsigned int ctime = 0; |
ec8aa669 FF |
657 | unsigned int t_slot = 9; /* FIXME */ |
658 | unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); | |
a0497f9f | 659 | unsigned int overhead = 0, overhead_rtscts = 0; |
ec8aa669 FF |
660 | |
661 | mr = minstrel_get_ratestats(mi, index); | |
662 | if (mr->probability < MINSTREL_FRAC(1, 10)) { | |
663 | mr->retry_count = 1; | |
664 | mr->retry_count_rtscts = 1; | |
665 | return; | |
666 | } | |
667 | ||
668 | mr->retry_count = 2; | |
669 | mr->retry_count_rtscts = 2; | |
670 | mr->retry_updated = true; | |
671 | ||
672 | group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
ed97a13c | 673 | tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000; |
8fddddff DH |
674 | |
675 | /* Contention time for first 2 tries */ | |
676 | ctime = (t_slot * cw) >> 1; | |
677 | cw = min((cw << 1) | 1, mp->cw_max); | |
678 | ctime += (t_slot * cw) >> 1; | |
679 | cw = min((cw << 1) | 1, mp->cw_max); | |
680 | ||
a0497f9f FF |
681 | if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { |
682 | overhead = mi->overhead; | |
683 | overhead_rtscts = mi->overhead_rtscts; | |
684 | } | |
685 | ||
8fddddff | 686 | /* Total TX time for data and Contention after first 2 tries */ |
a0497f9f FF |
687 | tx_time = ctime + 2 * (overhead + tx_time_data); |
688 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); | |
8fddddff DH |
689 | |
690 | /* See how many more tries we can fit inside segment size */ | |
ec8aa669 | 691 | do { |
8fddddff DH |
692 | /* Contention time for this try */ |
693 | ctime = (t_slot * cw) >> 1; | |
694 | cw = min((cw << 1) | 1, mp->cw_max); | |
695 | ||
696 | /* Total TX time after this try */ | |
a0497f9f FF |
697 | tx_time += ctime + overhead + tx_time_data; |
698 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; | |
8fddddff | 699 | |
ec8aa669 FF |
700 | if (tx_time_rtscts < mp->segment_size) |
701 | mr->retry_count_rtscts++; | |
702 | } while ((tx_time < mp->segment_size) && | |
703 | (++mr->retry_count < mp->max_retry)); | |
704 | } | |
705 | ||
706 | ||
707 | static void | |
708 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
a8566662 | 709 | struct ieee80211_sta_rates *ratetbl, int offset, int index) |
ec8aa669 FF |
710 | { |
711 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
712 | struct minstrel_rate_stats *mr; | |
a8566662 FF |
713 | u8 idx; |
714 | u16 flags; | |
ec8aa669 FF |
715 | |
716 | mr = minstrel_get_ratestats(mi, index); | |
717 | if (!mr->retry_updated) | |
718 | minstrel_calc_retransmit(mp, mi, index); | |
719 | ||
a8566662 FF |
720 | if (mr->probability < MINSTREL_FRAC(20, 100) || !mr->retry_count) { |
721 | ratetbl->rate[offset].count = 2; | |
722 | ratetbl->rate[offset].count_rts = 2; | |
723 | ratetbl->rate[offset].count_cts = 2; | |
724 | } else { | |
725 | ratetbl->rate[offset].count = mr->retry_count; | |
726 | ratetbl->rate[offset].count_cts = mr->retry_count; | |
727 | ratetbl->rate[offset].count_rts = mr->retry_count_rtscts; | |
728 | } | |
a0497f9f FF |
729 | |
730 | if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { | |
a8566662 FF |
731 | idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
732 | flags = 0; | |
733 | } else { | |
7a5e3fa2 | 734 | idx = index % MCS_GROUP_RATES + (group->streams - 1) * 8; |
a8566662 FF |
735 | flags = IEEE80211_TX_RC_MCS | group->flags; |
736 | } | |
737 | ||
738 | if (offset > 0) { | |
739 | ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; | |
740 | flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
741 | } | |
742 | ||
743 | ratetbl->rate[offset].idx = idx; | |
744 | ratetbl->rate[offset].flags = flags; | |
745 | } | |
746 | ||
747 | static void | |
748 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
749 | { | |
750 | struct ieee80211_sta_rates *rates; | |
751 | int i = 0; | |
752 | ||
753 | rates = kzalloc(sizeof(*rates), GFP_ATOMIC); | |
754 | if (!rates) | |
a0497f9f | 755 | return; |
a8566662 | 756 | |
5935839a TH |
757 | /* Start with max_tp_rate[0] */ |
758 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]); | |
a8566662 FF |
759 | |
760 | if (mp->hw->max_rates >= 3) { | |
5935839a TH |
761 | /* At least 3 tx rates supported, use max_tp_rate[1] next */ |
762 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]); | |
a8566662 FF |
763 | } |
764 | ||
765 | if (mp->hw->max_rates >= 2) { | |
766 | /* | |
767 | * At least 2 tx rates supported, use max_prob_rate next */ | |
768 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); | |
a0497f9f FF |
769 | } |
770 | ||
a8566662 FF |
771 | rates->rate[i].idx = -1; |
772 | rate_control_set_rates(mp->hw, mi->sta, rates); | |
ec8aa669 FF |
773 | } |
774 | ||
775 | static inline int | |
776 | minstrel_get_duration(int index) | |
777 | { | |
778 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
779 | return group->duration[index % MCS_GROUP_RATES]; | |
780 | } | |
781 | ||
782 | static int | |
783 | minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
784 | { | |
785 | struct minstrel_rate_stats *mr; | |
786 | struct minstrel_mcs_group_data *mg; | |
5935839a | 787 | unsigned int sample_dur, sample_group, cur_max_tp_streams; |
ec8aa669 FF |
788 | int sample_idx = 0; |
789 | ||
790 | if (mi->sample_wait > 0) { | |
791 | mi->sample_wait--; | |
792 | return -1; | |
793 | } | |
794 | ||
795 | if (!mi->sample_tries) | |
796 | return -1; | |
797 | ||
f12140c0 KB |
798 | sample_group = mi->sample_group; |
799 | mg = &mi->groups[sample_group]; | |
ec8aa669 | 800 | sample_idx = sample_table[mg->column][mg->index]; |
f12140c0 KB |
801 | minstrel_next_sample_idx(mi); |
802 | ||
803 | if (!(mg->supported & BIT(sample_idx))) | |
804 | return -1; | |
805 | ||
ec8aa669 | 806 | mr = &mg->rates[sample_idx]; |
965237ab | 807 | sample_idx += sample_group * MCS_GROUP_RATES; |
ec8aa669 | 808 | |
ba6fa29c HS |
809 | /* |
810 | * Sampling might add some overhead (RTS, no aggregation) | |
811 | * to the frame. Hence, don't use sampling for the currently | |
a0ca796c | 812 | * used rates. |
ba6fa29c | 813 | */ |
5935839a TH |
814 | if (sample_idx == mi->max_tp_rate[0] || |
815 | sample_idx == mi->max_tp_rate[1] || | |
a0ca796c | 816 | sample_idx == mi->max_prob_rate) |
ba6fa29c | 817 | return -1; |
a0ca796c | 818 | |
ec8aa669 | 819 | /* |
bc96f242 FF |
820 | * Do not sample if the probability is already higher than 95% |
821 | * to avoid wasting airtime. | |
ec8aa669 | 822 | */ |
bc96f242 | 823 | if (mr->probability > MINSTREL_FRAC(95, 100)) |
8d5eab5a | 824 | return -1; |
ec8aa669 FF |
825 | |
826 | /* | |
827 | * Make sure that lower rates get sampled only occasionally, | |
828 | * if the link is working perfectly. | |
829 | */ | |
5935839a TH |
830 | |
831 | cur_max_tp_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / | |
832 | MCS_GROUP_RATES].streams; | |
965237ab | 833 | sample_dur = minstrel_get_duration(sample_idx); |
5935839a TH |
834 | if (sample_dur >= minstrel_get_duration(mi->max_tp_rate[1]) && |
835 | (cur_max_tp_streams - 1 < | |
965237ab FF |
836 | minstrel_mcs_groups[sample_group].streams || |
837 | sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { | |
c7317e41 | 838 | if (mr->sample_skipped < 20) |
8d5eab5a | 839 | return -1; |
ec8aa669 FF |
840 | |
841 | if (mi->sample_slow++ > 2) | |
8d5eab5a | 842 | return -1; |
ec8aa669 | 843 | } |
098b8afb | 844 | mi->sample_tries--; |
ec8aa669 FF |
845 | |
846 | return sample_idx; | |
ec8aa669 FF |
847 | } |
848 | ||
a0497f9f FF |
849 | static void |
850 | minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp, | |
851 | struct minstrel_ht_sta *mi, bool val) | |
852 | { | |
853 | u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported; | |
854 | ||
855 | if (!supported || !mi->cck_supported_short) | |
856 | return; | |
857 | ||
858 | if (supported & (mi->cck_supported_short << (val * 4))) | |
859 | return; | |
860 | ||
861 | supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4); | |
862 | mi->groups[MINSTREL_CCK_GROUP].supported = supported; | |
863 | } | |
864 | ||
ec8aa669 FF |
865 | static void |
866 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, | |
867 | struct ieee80211_tx_rate_control *txrc) | |
868 | { | |
a8566662 | 869 | const struct mcs_group *sample_group; |
ec8aa669 | 870 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
a8566662 | 871 | struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
ec8aa669 FF |
872 | struct minstrel_ht_sta_priv *msp = priv_sta; |
873 | struct minstrel_ht_sta *mi = &msp->ht; | |
874 | struct minstrel_priv *mp = priv; | |
875 | int sample_idx; | |
876 | ||
877 | if (rate_control_send_low(sta, priv_sta, txrc)) | |
878 | return; | |
879 | ||
880 | if (!msp->is_ht) | |
881 | return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); | |
882 | ||
883 | info->flags |= mi->tx_flags; | |
a0497f9f | 884 | minstrel_ht_check_cck_shortpreamble(mp, mi, txrc->short_preamble); |
6de062ce | 885 | |
37feb7e2 LB |
886 | #ifdef CONFIG_MAC80211_DEBUGFS |
887 | if (mp->fixed_rate_idx != -1) | |
888 | return; | |
889 | #endif | |
890 | ||
6de062ce HS |
891 | /* Don't use EAPOL frames for sampling on non-mrr hw */ |
892 | if (mp->hw->max_rates == 1 && | |
af61a165 | 893 | (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
6de062ce HS |
894 | sample_idx = -1; |
895 | else | |
896 | sample_idx = minstrel_get_sample_rate(mp, mi); | |
24f7580e | 897 | |
ec8aa669 FF |
898 | mi->total_packets++; |
899 | ||
900 | /* wraparound */ | |
901 | if (mi->total_packets == ~0) { | |
902 | mi->total_packets = 0; | |
903 | mi->sample_packets = 0; | |
904 | } | |
a8566662 FF |
905 | |
906 | if (sample_idx < 0) | |
907 | return; | |
908 | ||
909 | sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; | |
910 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
1cd15857 FF |
911 | rate->count = 1; |
912 | ||
913 | if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { | |
914 | int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); | |
915 | rate->idx = mp->cck_rates[idx]; | |
916 | rate->flags = 0; | |
917 | return; | |
918 | } | |
919 | ||
a8566662 | 920 | rate->idx = sample_idx % MCS_GROUP_RATES + |
7a5e3fa2 | 921 | (sample_group->streams - 1) * 8; |
a8566662 | 922 | rate->flags = IEEE80211_TX_RC_MCS | sample_group->flags; |
ec8aa669 FF |
923 | } |
924 | ||
a0497f9f FF |
925 | static void |
926 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
927 | struct ieee80211_supported_band *sband, | |
928 | struct ieee80211_sta *sta) | |
929 | { | |
930 | int i; | |
931 | ||
932 | if (sband->band != IEEE80211_BAND_2GHZ) | |
933 | return; | |
934 | ||
2dfca312 FF |
935 | if (!(mp->hw->flags & IEEE80211_HW_SUPPORTS_HT_CCK_RATES)) |
936 | return; | |
937 | ||
a0497f9f FF |
938 | mi->cck_supported = 0; |
939 | mi->cck_supported_short = 0; | |
940 | for (i = 0; i < 4; i++) { | |
941 | if (!rate_supported(sta, sband->band, mp->cck_rates[i])) | |
942 | continue; | |
943 | ||
944 | mi->cck_supported |= BIT(i); | |
945 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
946 | mi->cck_supported_short |= BIT(i); | |
947 | } | |
948 | ||
949 | mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported; | |
950 | } | |
951 | ||
ec8aa669 FF |
952 | static void |
953 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 954 | struct cfg80211_chan_def *chandef, |
64f68e5d | 955 | struct ieee80211_sta *sta, void *priv_sta) |
ec8aa669 FF |
956 | { |
957 | struct minstrel_priv *mp = priv; | |
958 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
959 | struct minstrel_ht_sta *mi = &msp->ht; | |
960 | struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; | |
ec8aa669 | 961 | u16 sta_cap = sta->ht_cap.cap; |
4dc217df | 962 | int n_supported = 0; |
ec8aa669 FF |
963 | int ack_dur; |
964 | int stbc; | |
965 | int i; | |
966 | ||
967 | /* fall back to the old minstrel for legacy stations */ | |
4dc217df FF |
968 | if (!sta->ht_cap.ht_supported) |
969 | goto use_legacy; | |
ec8aa669 FF |
970 | |
971 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != | |
a0497f9f | 972 | MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS + 1); |
ec8aa669 FF |
973 | |
974 | msp->is_ht = true; | |
975 | memset(mi, 0, sizeof(*mi)); | |
a8566662 FF |
976 | |
977 | mi->sta = sta; | |
ec8aa669 FF |
978 | mi->stats_update = jiffies; |
979 | ||
438b61b7 SW |
980 | ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); |
981 | mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); | |
982 | mi->overhead += ack_dur; | |
ec8aa669 FF |
983 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
984 | ||
985 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); | |
986 | ||
987 | /* When using MRR, sample more on the first attempt, without delay */ | |
988 | if (mp->has_mrr) { | |
989 | mi->sample_count = 16; | |
990 | mi->sample_wait = 0; | |
991 | } else { | |
992 | mi->sample_count = 8; | |
993 | mi->sample_wait = 8; | |
994 | } | |
995 | mi->sample_tries = 4; | |
996 | ||
997 | stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >> | |
998 | IEEE80211_HT_CAP_RX_STBC_SHIFT; | |
999 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; | |
1000 | ||
1001 | if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) | |
1002 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; | |
1003 | ||
ec8aa669 | 1004 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
ec8aa669 | 1005 | mi->groups[i].supported = 0; |
a0497f9f FF |
1006 | if (i == MINSTREL_CCK_GROUP) { |
1007 | minstrel_ht_update_cck(mp, mi, sband, sta); | |
1008 | continue; | |
1009 | } | |
1010 | ||
ec8aa669 | 1011 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) { |
e1a0c6b3 JB |
1012 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
1013 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_40)) | |
1014 | continue; | |
1015 | } else { | |
1016 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_20)) | |
1017 | continue; | |
1018 | } | |
ec8aa669 FF |
1019 | } |
1020 | ||
e1a0c6b3 JB |
1021 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
1022 | sta->bandwidth < IEEE80211_STA_RX_BW_40) | |
ec8aa669 FF |
1023 | continue; |
1024 | ||
e9219779 | 1025 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
af0ed69b | 1026 | if (sta->smps_mode == IEEE80211_SMPS_STATIC && |
e9219779 HS |
1027 | minstrel_mcs_groups[i].streams > 1) |
1028 | continue; | |
1029 | ||
ec8aa669 FF |
1030 | mi->groups[i].supported = |
1031 | mcs->rx_mask[minstrel_mcs_groups[i].streams - 1]; | |
4dc217df FF |
1032 | |
1033 | if (mi->groups[i].supported) | |
1034 | n_supported++; | |
ec8aa669 | 1035 | } |
4dc217df FF |
1036 | |
1037 | if (!n_supported) | |
1038 | goto use_legacy; | |
1039 | ||
a8566662 | 1040 | /* create an initial rate table with the lowest supported rates */ |
a3647362 | 1041 | minstrel_ht_update_stats(mp, mi); |
a8566662 | 1042 | minstrel_ht_update_rates(mp, mi); |
a3647362 | 1043 | |
4dc217df FF |
1044 | return; |
1045 | ||
1046 | use_legacy: | |
1047 | msp->is_ht = false; | |
1048 | memset(&msp->legacy, 0, sizeof(msp->legacy)); | |
1049 | msp->legacy.r = msp->ratelist; | |
1050 | msp->legacy.sample_table = msp->sample_table; | |
3de805cf SW |
1051 | return mac80211_minstrel.rate_init(priv, sband, chandef, sta, |
1052 | &msp->legacy); | |
ec8aa669 FF |
1053 | } |
1054 | ||
1055 | static void | |
1056 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1057 | struct cfg80211_chan_def *chandef, |
ec8aa669 FF |
1058 | struct ieee80211_sta *sta, void *priv_sta) |
1059 | { | |
3de805cf | 1060 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1061 | } |
1062 | ||
1063 | static void | |
1064 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1065 | struct cfg80211_chan_def *chandef, |
ec8aa669 | 1066 | struct ieee80211_sta *sta, void *priv_sta, |
64f68e5d | 1067 | u32 changed) |
ec8aa669 | 1068 | { |
3de805cf | 1069 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1070 | } |
1071 | ||
1072 | static void * | |
1073 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) | |
1074 | { | |
1075 | struct ieee80211_supported_band *sband; | |
1076 | struct minstrel_ht_sta_priv *msp; | |
1077 | struct minstrel_priv *mp = priv; | |
1078 | struct ieee80211_hw *hw = mp->hw; | |
1079 | int max_rates = 0; | |
1080 | int i; | |
1081 | ||
1082 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
1083 | sband = hw->wiphy->bands[i]; | |
1084 | if (sband && sband->n_bitrates > max_rates) | |
1085 | max_rates = sband->n_bitrates; | |
1086 | } | |
1087 | ||
472dd35c | 1088 | msp = kzalloc(sizeof(*msp), gfp); |
ec8aa669 FF |
1089 | if (!msp) |
1090 | return NULL; | |
1091 | ||
1092 | msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); | |
1093 | if (!msp->ratelist) | |
1094 | goto error; | |
1095 | ||
1096 | msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp); | |
1097 | if (!msp->sample_table) | |
1098 | goto error1; | |
1099 | ||
1100 | return msp; | |
1101 | ||
1102 | error1: | |
7e988014 | 1103 | kfree(msp->ratelist); |
ec8aa669 FF |
1104 | error: |
1105 | kfree(msp); | |
1106 | return NULL; | |
1107 | } | |
1108 | ||
1109 | static void | |
1110 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) | |
1111 | { | |
1112 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1113 | ||
1114 | kfree(msp->sample_table); | |
1115 | kfree(msp->ratelist); | |
1116 | kfree(msp); | |
1117 | } | |
1118 | ||
1119 | static void * | |
1120 | minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
1121 | { | |
1122 | return mac80211_minstrel.alloc(hw, debugfsdir); | |
1123 | } | |
1124 | ||
1125 | static void | |
1126 | minstrel_ht_free(void *priv) | |
1127 | { | |
1128 | mac80211_minstrel.free(priv); | |
1129 | } | |
1130 | ||
cca674d4 AQ |
1131 | static u32 minstrel_ht_get_expected_throughput(void *priv_sta) |
1132 | { | |
1133 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1134 | struct minstrel_ht_sta *mi = &msp->ht; | |
1135 | int i, j; | |
1136 | ||
1137 | if (!msp->is_ht) | |
1138 | return mac80211_minstrel.get_expected_throughput(priv_sta); | |
1139 | ||
5935839a TH |
1140 | i = mi->max_tp_rate[0] / MCS_GROUP_RATES; |
1141 | j = mi->max_tp_rate[0] % MCS_GROUP_RATES; | |
cca674d4 AQ |
1142 | |
1143 | /* convert cur_tp from pkt per second in kbps */ | |
1144 | return mi->groups[i].rates[j].cur_tp * AVG_PKT_SIZE * 8 / 1024; | |
1145 | } | |
1146 | ||
631ad703 | 1147 | static const struct rate_control_ops mac80211_minstrel_ht = { |
ec8aa669 FF |
1148 | .name = "minstrel_ht", |
1149 | .tx_status = minstrel_ht_tx_status, | |
1150 | .get_rate = minstrel_ht_get_rate, | |
1151 | .rate_init = minstrel_ht_rate_init, | |
1152 | .rate_update = minstrel_ht_rate_update, | |
1153 | .alloc_sta = minstrel_ht_alloc_sta, | |
1154 | .free_sta = minstrel_ht_free_sta, | |
1155 | .alloc = minstrel_ht_alloc, | |
1156 | .free = minstrel_ht_free, | |
1157 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1158 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, | |
1159 | .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs, | |
1160 | #endif | |
cca674d4 | 1161 | .get_expected_throughput = minstrel_ht_get_expected_throughput, |
ec8aa669 FF |
1162 | }; |
1163 | ||
1164 | ||
f6e1a73b | 1165 | static void __init init_sample_table(void) |
ec8aa669 FF |
1166 | { |
1167 | int col, i, new_idx; | |
1168 | u8 rnd[MCS_GROUP_RATES]; | |
1169 | ||
1170 | memset(sample_table, 0xff, sizeof(sample_table)); | |
1171 | for (col = 0; col < SAMPLE_COLUMNS; col++) { | |
f7d8ad81 | 1172 | prandom_bytes(rnd, sizeof(rnd)); |
ec8aa669 | 1173 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
ec8aa669 | 1174 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
ec8aa669 FF |
1175 | while (sample_table[col][new_idx] != 0xff) |
1176 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; | |
1177 | ||
1178 | sample_table[col][new_idx] = i; | |
1179 | } | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | int __init | |
1184 | rc80211_minstrel_ht_init(void) | |
1185 | { | |
1186 | init_sample_table(); | |
1187 | return ieee80211_rate_control_register(&mac80211_minstrel_ht); | |
1188 | } | |
1189 | ||
1190 | void | |
1191 | rc80211_minstrel_ht_exit(void) | |
1192 | { | |
1193 | ieee80211_rate_control_unregister(&mac80211_minstrel_ht); | |
1194 | } |