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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 | ||
255 | tmp_group = tp_list[j - 1] / MCS_GROUP_RATES; | |
256 | tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES; | |
257 | tmp_thr = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
258 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].probability; | |
259 | ||
260 | while (j > 0 && (cur_thr > tmp_thr || | |
261 | (cur_thr == tmp_thr && cur_prob > tmp_prob))) { | |
262 | j--; | |
263 | tmp_group = tp_list[j - 1] / MCS_GROUP_RATES; | |
264 | tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES; | |
265 | tmp_thr = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
266 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].probability; | |
267 | } | |
268 | ||
269 | if (j < MAX_THR_RATES - 1) { | |
270 | memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) * | |
271 | (MAX_THR_RATES - (j + 1)))); | |
272 | } | |
273 | if (j < MAX_THR_RATES) | |
274 | tp_list[j] = index; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Find and set the topmost probability rate per sta and per group | |
279 | */ | |
280 | static void | |
281 | minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u8 index) | |
282 | { | |
283 | struct minstrel_mcs_group_data *mg; | |
284 | struct minstrel_rate_stats *mr; | |
285 | int tmp_group, tmp_idx, tmp_tp, tmp_prob, max_tp_group; | |
286 | ||
287 | mg = &mi->groups[index / MCS_GROUP_RATES]; | |
288 | mr = &mg->rates[index % MCS_GROUP_RATES]; | |
289 | ||
290 | tmp_group = mi->max_prob_rate / MCS_GROUP_RATES; | |
291 | tmp_idx = mi->max_prob_rate % MCS_GROUP_RATES; | |
292 | tmp_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
293 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].probability; | |
294 | ||
295 | /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from | |
296 | * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */ | |
297 | max_tp_group = mi->max_tp_rate[0] / MCS_GROUP_RATES; | |
298 | if((index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) && | |
299 | (max_tp_group != MINSTREL_CCK_GROUP)) | |
300 | return; | |
301 | ||
302 | if (mr->probability > MINSTREL_FRAC(75, 100)) { | |
303 | if (mr->cur_tp > tmp_tp) | |
304 | mi->max_prob_rate = index; | |
305 | if (mr->cur_tp > mg->rates[mg->max_group_prob_rate].cur_tp) | |
306 | mg->max_group_prob_rate = index; | |
307 | } else { | |
308 | if (mr->probability > tmp_prob) | |
309 | mi->max_prob_rate = index; | |
310 | if (mr->probability > mg->rates[mg->max_group_prob_rate].probability) | |
311 | mg->max_group_prob_rate = index; | |
312 | } | |
313 | } | |
314 | ||
315 | ||
316 | /* | |
317 | * Assign new rate set per sta and use CCK rates only if the fastest | |
318 | * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted | |
319 | * rate sets where MCS and CCK rates are mixed, because CCK rates can | |
320 | * not use aggregation. | |
321 | */ | |
322 | static void | |
323 | minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi, | |
324 | u8 tmp_mcs_tp_rate[MAX_THR_RATES], | |
325 | u8 tmp_cck_tp_rate[MAX_THR_RATES]) | |
326 | { | |
327 | unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp; | |
328 | int i; | |
329 | ||
330 | tmp_group = tmp_cck_tp_rate[0] / MCS_GROUP_RATES; | |
331 | tmp_idx = tmp_cck_tp_rate[0] % MCS_GROUP_RATES; | |
332 | tmp_cck_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
333 | ||
334 | tmp_group = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES; | |
335 | tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES; | |
336 | tmp_mcs_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp; | |
337 | ||
338 | if (tmp_cck_tp > tmp_mcs_tp) { | |
339 | for(i = 0; i < MAX_THR_RATES; i++) { | |
340 | minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i], | |
341 | tmp_mcs_tp_rate); | |
342 | } | |
343 | } | |
344 | ||
345 | } | |
346 | ||
347 | /* | |
348 | * Try to increase robustness of max_prob rate by decrease number of | |
349 | * streams if possible. | |
350 | */ | |
351 | static inline void | |
352 | minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi) | |
353 | { | |
354 | struct minstrel_mcs_group_data *mg; | |
355 | struct minstrel_rate_stats *mr; | |
356 | int tmp_max_streams, group; | |
357 | int tmp_tp = 0; | |
358 | ||
359 | tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / | |
360 | MCS_GROUP_RATES].streams; | |
361 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
362 | mg = &mi->groups[group]; | |
363 | if (!mg->supported || group == MINSTREL_CCK_GROUP) | |
364 | continue; | |
365 | mr = minstrel_get_ratestats(mi, mg->max_group_prob_rate); | |
366 | if (tmp_tp < mr->cur_tp && | |
367 | (minstrel_mcs_groups[group].streams < tmp_max_streams)) { | |
368 | mi->max_prob_rate = mg->max_group_prob_rate; | |
369 | tmp_tp = mr->cur_tp; | |
370 | } | |
371 | } | |
372 | } | |
373 | ||
ec8aa669 FF |
374 | /* |
375 | * Update rate statistics and select new primary rates | |
376 | * | |
377 | * Rules for rate selection: | |
378 | * - max_prob_rate must use only one stream, as a tradeoff between delivery | |
379 | * probability and throughput during strong fluctuations | |
5935839a | 380 | * - as long as the max prob rate has a probability of more than 75%, pick |
ec8aa669 FF |
381 | * higher throughput rates, even if the probablity is a bit lower |
382 | */ | |
383 | static void | |
384 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
385 | { | |
386 | struct minstrel_mcs_group_data *mg; | |
387 | struct minstrel_rate_stats *mr; | |
5935839a TH |
388 | int group, i, j; |
389 | u8 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES]; | |
390 | u8 tmp_cck_tp_rate[MAX_THR_RATES], index; | |
ec8aa669 FF |
391 | |
392 | if (mi->ampdu_packets > 0) { | |
393 | mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, | |
394 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL); | |
395 | mi->ampdu_len = 0; | |
396 | mi->ampdu_packets = 0; | |
397 | } | |
398 | ||
399 | mi->sample_slow = 0; | |
400 | mi->sample_count = 0; | |
ec8aa669 | 401 | |
5935839a TH |
402 | /* Initialize global rate indexes */ |
403 | for(j = 0; j < MAX_THR_RATES; j++){ | |
404 | tmp_mcs_tp_rate[j] = 0; | |
405 | tmp_cck_tp_rate[j] = 0; | |
406 | } | |
c2eb5b0f | 407 | |
5935839a TH |
408 | /* Find best rate sets within all MCS groups*/ |
409 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
ec8aa669 FF |
410 | |
411 | mg = &mi->groups[group]; | |
412 | if (!mg->supported) | |
413 | continue; | |
414 | ||
ec8aa669 FF |
415 | mi->sample_count++; |
416 | ||
5935839a TH |
417 | /* (re)Initialize group rate indexes */ |
418 | for(j = 0; j < MAX_THR_RATES; j++) | |
419 | tmp_group_tp_rate[j] = group; | |
420 | ||
ec8aa669 FF |
421 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
422 | if (!(mg->supported & BIT(i))) | |
423 | continue; | |
424 | ||
351df099 KB |
425 | index = MCS_GROUP_RATES * group + i; |
426 | ||
ec8aa669 FF |
427 | mr = &mg->rates[i]; |
428 | mr->retry_updated = false; | |
6048d763 PK |
429 | minstrel_calc_rate_ewma(mr); |
430 | minstrel_ht_calc_tp(mi, group, i); | |
ec8aa669 FF |
431 | |
432 | if (!mr->cur_tp) | |
433 | continue; | |
434 | ||
5935839a TH |
435 | /* Find max throughput rate set */ |
436 | if (group != MINSTREL_CCK_GROUP) { | |
437 | minstrel_ht_sort_best_tp_rates(mi, index, | |
438 | tmp_mcs_tp_rate); | |
439 | } else if (group == MINSTREL_CCK_GROUP) { | |
440 | minstrel_ht_sort_best_tp_rates(mi, index, | |
441 | tmp_cck_tp_rate); | |
ec8aa669 | 442 | } |
ec8aa669 | 443 | |
5935839a TH |
444 | /* Find max throughput rate set within a group */ |
445 | minstrel_ht_sort_best_tp_rates(mi, index, | |
446 | tmp_group_tp_rate); | |
ec8aa669 | 447 | |
5935839a TH |
448 | /* Find max probability rate per group and global */ |
449 | minstrel_ht_set_best_prob_rate(mi, index); | |
ec8aa669 FF |
450 | } |
451 | ||
5935839a TH |
452 | memcpy(mg->max_group_tp_rate, tmp_group_tp_rate, |
453 | sizeof(mg->max_group_tp_rate)); | |
ec8aa669 FF |
454 | } |
455 | ||
5935839a TH |
456 | /* Assign new rate set per sta */ |
457 | minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, tmp_cck_tp_rate); | |
458 | memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate)); | |
a299c6d5 | 459 | |
5935839a TH |
460 | /* Try to increase robustness of max_prob_rate*/ |
461 | minstrel_ht_prob_rate_reduce_streams(mi); | |
462 | ||
463 | /* try to sample all available rates during each interval */ | |
464 | mi->sample_count *= 8; | |
a299c6d5 | 465 | |
37feb7e2 LB |
466 | #ifdef CONFIG_MAC80211_DEBUGFS |
467 | /* use fixed index if set */ | |
468 | if (mp->fixed_rate_idx != -1) { | |
5935839a TH |
469 | for (i = 0; i < 4; i++) |
470 | mi->max_tp_rate[i] = mp->fixed_rate_idx; | |
37feb7e2 LB |
471 | mi->max_prob_rate = mp->fixed_rate_idx; |
472 | } | |
473 | #endif | |
a299c6d5 | 474 | |
5935839a | 475 | /* Reset update timer */ |
ec8aa669 FF |
476 | mi->stats_update = jiffies; |
477 | } | |
478 | ||
479 | static bool | |
a0497f9f | 480 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
ec8aa669 | 481 | { |
b79296be | 482 | if (rate->idx < 0) |
ec8aa669 FF |
483 | return false; |
484 | ||
b79296be | 485 | if (!rate->count) |
ec8aa669 FF |
486 | return false; |
487 | ||
a0497f9f FF |
488 | if (rate->flags & IEEE80211_TX_RC_MCS) |
489 | return true; | |
490 | ||
491 | return rate->idx == mp->cck_rates[0] || | |
492 | rate->idx == mp->cck_rates[1] || | |
493 | rate->idx == mp->cck_rates[2] || | |
494 | rate->idx == mp->cck_rates[3]; | |
ec8aa669 FF |
495 | } |
496 | ||
497 | static void | |
498 | minstrel_next_sample_idx(struct minstrel_ht_sta *mi) | |
499 | { | |
500 | struct minstrel_mcs_group_data *mg; | |
501 | ||
502 | for (;;) { | |
503 | mi->sample_group++; | |
504 | mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); | |
505 | mg = &mi->groups[mi->sample_group]; | |
506 | ||
507 | if (!mg->supported) | |
508 | continue; | |
509 | ||
510 | if (++mg->index >= MCS_GROUP_RATES) { | |
511 | mg->index = 0; | |
512 | if (++mg->column >= ARRAY_SIZE(sample_table)) | |
513 | mg->column = 0; | |
514 | } | |
515 | break; | |
516 | } | |
517 | } | |
518 | ||
519 | static void | |
5935839a | 520 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u8 *idx, bool primary) |
ec8aa669 FF |
521 | { |
522 | int group, orig_group; | |
523 | ||
524 | orig_group = group = *idx / MCS_GROUP_RATES; | |
525 | while (group > 0) { | |
526 | group--; | |
527 | ||
528 | if (!mi->groups[group].supported) | |
529 | continue; | |
530 | ||
531 | if (minstrel_mcs_groups[group].streams > | |
532 | minstrel_mcs_groups[orig_group].streams) | |
533 | continue; | |
534 | ||
535 | if (primary) | |
5935839a | 536 | *idx = mi->groups[group].max_group_tp_rate[0]; |
ec8aa669 | 537 | else |
5935839a | 538 | *idx = mi->groups[group].max_group_tp_rate[1]; |
ec8aa669 FF |
539 | break; |
540 | } | |
541 | } | |
542 | ||
543 | static void | |
6048d763 | 544 | minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
ec8aa669 FF |
545 | { |
546 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
547 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
548 | u16 tid; | |
549 | ||
550 | if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) | |
551 | return; | |
552 | ||
e133fae2 | 553 | if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) |
ec8aa669 FF |
554 | return; |
555 | ||
556 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
a622ab72 | 557 | if (likely(sta->ampdu_mlme.tid_tx[tid])) |
ec8aa669 FF |
558 | return; |
559 | ||
48124d1a LR |
560 | if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
561 | return; | |
562 | ||
bd2ce6e4 | 563 | ieee80211_start_tx_ba_session(pubsta, tid, 5000); |
ec8aa669 FF |
564 | } |
565 | ||
566 | static void | |
567 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, | |
568 | struct ieee80211_sta *sta, void *priv_sta, | |
569 | struct sk_buff *skb) | |
570 | { | |
571 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
572 | struct minstrel_ht_sta *mi = &msp->ht; | |
573 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
574 | struct ieee80211_tx_rate *ar = info->status.rates; | |
575 | struct minstrel_rate_stats *rate, *rate2; | |
576 | struct minstrel_priv *mp = priv; | |
a8566662 | 577 | bool last, update = false; |
a544ab7f | 578 | int i; |
ec8aa669 FF |
579 | |
580 | if (!msp->is_ht) | |
581 | return mac80211_minstrel.tx_status(priv, sband, sta, &msp->legacy, skb); | |
582 | ||
583 | /* This packet was aggregated but doesn't carry status info */ | |
584 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
585 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
586 | return; | |
587 | ||
15d46f38 BS |
588 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
589 | info->status.ampdu_ack_len = | |
590 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); | |
ec8aa669 FF |
591 | info->status.ampdu_len = 1; |
592 | } | |
593 | ||
594 | mi->ampdu_packets++; | |
595 | mi->ampdu_len += info->status.ampdu_len; | |
596 | ||
597 | if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { | |
c7317e41 | 598 | mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len); |
52c00a37 | 599 | mi->sample_tries = 1; |
ec8aa669 FF |
600 | mi->sample_count--; |
601 | } | |
602 | ||
8d5eab5a | 603 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
ec8aa669 | 604 | mi->sample_packets += info->status.ampdu_len; |
ec8aa669 | 605 | |
a0497f9f | 606 | last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
ec8aa669 FF |
607 | for (i = 0; !last; i++) { |
608 | last = (i == IEEE80211_TX_MAX_RATES - 1) || | |
a0497f9f | 609 | !minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
ec8aa669 | 610 | |
a0497f9f | 611 | rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
ec8aa669 | 612 | |
15d46f38 | 613 | if (last) |
ec8aa669 FF |
614 | rate->success += info->status.ampdu_ack_len; |
615 | ||
616 | rate->attempts += ar[i].count * info->status.ampdu_len; | |
617 | } | |
618 | ||
619 | /* | |
620 | * check for sudden death of spatial multiplexing, | |
621 | * downgrade to a lower number of streams if necessary. | |
622 | */ | |
5935839a | 623 | rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]); |
ec8aa669 FF |
624 | if (rate->attempts > 30 && |
625 | MINSTREL_FRAC(rate->success, rate->attempts) < | |
a8566662 | 626 | MINSTREL_FRAC(20, 100)) { |
5935839a | 627 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true); |
a8566662 FF |
628 | update = true; |
629 | } | |
ec8aa669 | 630 | |
5935839a | 631 | rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]); |
ecc3d5ae ML |
632 | if (rate2->attempts > 30 && |
633 | MINSTREL_FRAC(rate2->success, rate2->attempts) < | |
a8566662 | 634 | MINSTREL_FRAC(20, 100)) { |
5935839a | 635 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false); |
a8566662 FF |
636 | update = true; |
637 | } | |
ec8aa669 FF |
638 | |
639 | if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) { | |
a8566662 | 640 | update = true; |
ec8aa669 | 641 | minstrel_ht_update_stats(mp, mi); |
a0497f9f FF |
642 | if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
643 | mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) | |
6048d763 | 644 | minstrel_aggr_check(sta, skb); |
ec8aa669 | 645 | } |
a8566662 FF |
646 | |
647 | if (update) | |
648 | minstrel_ht_update_rates(mp, mi); | |
ec8aa669 FF |
649 | } |
650 | ||
651 | static void | |
652 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
653 | int index) | |
654 | { | |
655 | struct minstrel_rate_stats *mr; | |
656 | const struct mcs_group *group; | |
657 | unsigned int tx_time, tx_time_rtscts, tx_time_data; | |
658 | unsigned int cw = mp->cw_min; | |
8fddddff | 659 | unsigned int ctime = 0; |
ec8aa669 FF |
660 | unsigned int t_slot = 9; /* FIXME */ |
661 | unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); | |
a0497f9f | 662 | unsigned int overhead = 0, overhead_rtscts = 0; |
ec8aa669 FF |
663 | |
664 | mr = minstrel_get_ratestats(mi, index); | |
665 | if (mr->probability < MINSTREL_FRAC(1, 10)) { | |
666 | mr->retry_count = 1; | |
667 | mr->retry_count_rtscts = 1; | |
668 | return; | |
669 | } | |
670 | ||
671 | mr->retry_count = 2; | |
672 | mr->retry_count_rtscts = 2; | |
673 | mr->retry_updated = true; | |
674 | ||
675 | group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
ed97a13c | 676 | tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000; |
8fddddff DH |
677 | |
678 | /* Contention time for first 2 tries */ | |
679 | ctime = (t_slot * cw) >> 1; | |
680 | cw = min((cw << 1) | 1, mp->cw_max); | |
681 | ctime += (t_slot * cw) >> 1; | |
682 | cw = min((cw << 1) | 1, mp->cw_max); | |
683 | ||
a0497f9f FF |
684 | if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { |
685 | overhead = mi->overhead; | |
686 | overhead_rtscts = mi->overhead_rtscts; | |
687 | } | |
688 | ||
8fddddff | 689 | /* Total TX time for data and Contention after first 2 tries */ |
a0497f9f FF |
690 | tx_time = ctime + 2 * (overhead + tx_time_data); |
691 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); | |
8fddddff DH |
692 | |
693 | /* See how many more tries we can fit inside segment size */ | |
ec8aa669 | 694 | do { |
8fddddff DH |
695 | /* Contention time for this try */ |
696 | ctime = (t_slot * cw) >> 1; | |
697 | cw = min((cw << 1) | 1, mp->cw_max); | |
698 | ||
699 | /* Total TX time after this try */ | |
a0497f9f FF |
700 | tx_time += ctime + overhead + tx_time_data; |
701 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; | |
8fddddff | 702 | |
ec8aa669 FF |
703 | if (tx_time_rtscts < mp->segment_size) |
704 | mr->retry_count_rtscts++; | |
705 | } while ((tx_time < mp->segment_size) && | |
706 | (++mr->retry_count < mp->max_retry)); | |
707 | } | |
708 | ||
709 | ||
710 | static void | |
711 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
a8566662 | 712 | struct ieee80211_sta_rates *ratetbl, int offset, int index) |
ec8aa669 FF |
713 | { |
714 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
715 | struct minstrel_rate_stats *mr; | |
a8566662 FF |
716 | u8 idx; |
717 | u16 flags; | |
ec8aa669 FF |
718 | |
719 | mr = minstrel_get_ratestats(mi, index); | |
720 | if (!mr->retry_updated) | |
721 | minstrel_calc_retransmit(mp, mi, index); | |
722 | ||
a8566662 FF |
723 | if (mr->probability < MINSTREL_FRAC(20, 100) || !mr->retry_count) { |
724 | ratetbl->rate[offset].count = 2; | |
725 | ratetbl->rate[offset].count_rts = 2; | |
726 | ratetbl->rate[offset].count_cts = 2; | |
727 | } else { | |
728 | ratetbl->rate[offset].count = mr->retry_count; | |
729 | ratetbl->rate[offset].count_cts = mr->retry_count; | |
730 | ratetbl->rate[offset].count_rts = mr->retry_count_rtscts; | |
731 | } | |
a0497f9f FF |
732 | |
733 | if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { | |
a8566662 FF |
734 | idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
735 | flags = 0; | |
736 | } else { | |
7a5e3fa2 | 737 | idx = index % MCS_GROUP_RATES + (group->streams - 1) * 8; |
a8566662 FF |
738 | flags = IEEE80211_TX_RC_MCS | group->flags; |
739 | } | |
740 | ||
741 | if (offset > 0) { | |
742 | ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; | |
743 | flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
744 | } | |
745 | ||
746 | ratetbl->rate[offset].idx = idx; | |
747 | ratetbl->rate[offset].flags = flags; | |
748 | } | |
749 | ||
750 | static void | |
751 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
752 | { | |
753 | struct ieee80211_sta_rates *rates; | |
754 | int i = 0; | |
755 | ||
756 | rates = kzalloc(sizeof(*rates), GFP_ATOMIC); | |
757 | if (!rates) | |
a0497f9f | 758 | return; |
a8566662 | 759 | |
5935839a TH |
760 | /* Start with max_tp_rate[0] */ |
761 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]); | |
a8566662 FF |
762 | |
763 | if (mp->hw->max_rates >= 3) { | |
5935839a TH |
764 | /* At least 3 tx rates supported, use max_tp_rate[1] next */ |
765 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]); | |
a8566662 FF |
766 | } |
767 | ||
768 | if (mp->hw->max_rates >= 2) { | |
769 | /* | |
770 | * At least 2 tx rates supported, use max_prob_rate next */ | |
771 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); | |
a0497f9f FF |
772 | } |
773 | ||
a8566662 FF |
774 | rates->rate[i].idx = -1; |
775 | rate_control_set_rates(mp->hw, mi->sta, rates); | |
ec8aa669 FF |
776 | } |
777 | ||
778 | static inline int | |
779 | minstrel_get_duration(int index) | |
780 | { | |
781 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
782 | return group->duration[index % MCS_GROUP_RATES]; | |
783 | } | |
784 | ||
785 | static int | |
786 | minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
787 | { | |
788 | struct minstrel_rate_stats *mr; | |
789 | struct minstrel_mcs_group_data *mg; | |
5935839a | 790 | unsigned int sample_dur, sample_group, cur_max_tp_streams; |
ec8aa669 FF |
791 | int sample_idx = 0; |
792 | ||
793 | if (mi->sample_wait > 0) { | |
794 | mi->sample_wait--; | |
795 | return -1; | |
796 | } | |
797 | ||
798 | if (!mi->sample_tries) | |
799 | return -1; | |
800 | ||
f12140c0 KB |
801 | sample_group = mi->sample_group; |
802 | mg = &mi->groups[sample_group]; | |
ec8aa669 | 803 | sample_idx = sample_table[mg->column][mg->index]; |
f12140c0 KB |
804 | minstrel_next_sample_idx(mi); |
805 | ||
806 | if (!(mg->supported & BIT(sample_idx))) | |
807 | return -1; | |
808 | ||
ec8aa669 | 809 | mr = &mg->rates[sample_idx]; |
965237ab | 810 | sample_idx += sample_group * MCS_GROUP_RATES; |
ec8aa669 | 811 | |
ba6fa29c HS |
812 | /* |
813 | * Sampling might add some overhead (RTS, no aggregation) | |
814 | * to the frame. Hence, don't use sampling for the currently | |
a0ca796c | 815 | * used rates. |
ba6fa29c | 816 | */ |
5935839a TH |
817 | if (sample_idx == mi->max_tp_rate[0] || |
818 | sample_idx == mi->max_tp_rate[1] || | |
a0ca796c | 819 | sample_idx == mi->max_prob_rate) |
ba6fa29c | 820 | return -1; |
a0ca796c | 821 | |
ec8aa669 | 822 | /* |
bc96f242 FF |
823 | * Do not sample if the probability is already higher than 95% |
824 | * to avoid wasting airtime. | |
ec8aa669 | 825 | */ |
bc96f242 | 826 | if (mr->probability > MINSTREL_FRAC(95, 100)) |
8d5eab5a | 827 | return -1; |
ec8aa669 FF |
828 | |
829 | /* | |
830 | * Make sure that lower rates get sampled only occasionally, | |
831 | * if the link is working perfectly. | |
832 | */ | |
5935839a TH |
833 | |
834 | cur_max_tp_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / | |
835 | MCS_GROUP_RATES].streams; | |
965237ab | 836 | sample_dur = minstrel_get_duration(sample_idx); |
5935839a TH |
837 | if (sample_dur >= minstrel_get_duration(mi->max_tp_rate[1]) && |
838 | (cur_max_tp_streams - 1 < | |
965237ab FF |
839 | minstrel_mcs_groups[sample_group].streams || |
840 | sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { | |
c7317e41 | 841 | if (mr->sample_skipped < 20) |
8d5eab5a | 842 | return -1; |
ec8aa669 FF |
843 | |
844 | if (mi->sample_slow++ > 2) | |
8d5eab5a | 845 | return -1; |
ec8aa669 | 846 | } |
098b8afb | 847 | mi->sample_tries--; |
ec8aa669 FF |
848 | |
849 | return sample_idx; | |
ec8aa669 FF |
850 | } |
851 | ||
a0497f9f FF |
852 | static void |
853 | minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp, | |
854 | struct minstrel_ht_sta *mi, bool val) | |
855 | { | |
856 | u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported; | |
857 | ||
858 | if (!supported || !mi->cck_supported_short) | |
859 | return; | |
860 | ||
861 | if (supported & (mi->cck_supported_short << (val * 4))) | |
862 | return; | |
863 | ||
864 | supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4); | |
865 | mi->groups[MINSTREL_CCK_GROUP].supported = supported; | |
866 | } | |
867 | ||
ec8aa669 FF |
868 | static void |
869 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, | |
870 | struct ieee80211_tx_rate_control *txrc) | |
871 | { | |
a8566662 | 872 | const struct mcs_group *sample_group; |
ec8aa669 | 873 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
a8566662 | 874 | struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
ec8aa669 FF |
875 | struct minstrel_ht_sta_priv *msp = priv_sta; |
876 | struct minstrel_ht_sta *mi = &msp->ht; | |
877 | struct minstrel_priv *mp = priv; | |
878 | int sample_idx; | |
879 | ||
880 | if (rate_control_send_low(sta, priv_sta, txrc)) | |
881 | return; | |
882 | ||
883 | if (!msp->is_ht) | |
884 | return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); | |
885 | ||
886 | info->flags |= mi->tx_flags; | |
a0497f9f | 887 | minstrel_ht_check_cck_shortpreamble(mp, mi, txrc->short_preamble); |
6de062ce | 888 | |
37feb7e2 LB |
889 | #ifdef CONFIG_MAC80211_DEBUGFS |
890 | if (mp->fixed_rate_idx != -1) | |
891 | return; | |
892 | #endif | |
893 | ||
6de062ce HS |
894 | /* Don't use EAPOL frames for sampling on non-mrr hw */ |
895 | if (mp->hw->max_rates == 1 && | |
af61a165 | 896 | (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
6de062ce HS |
897 | sample_idx = -1; |
898 | else | |
899 | sample_idx = minstrel_get_sample_rate(mp, mi); | |
24f7580e | 900 | |
ec8aa669 FF |
901 | mi->total_packets++; |
902 | ||
903 | /* wraparound */ | |
904 | if (mi->total_packets == ~0) { | |
905 | mi->total_packets = 0; | |
906 | mi->sample_packets = 0; | |
907 | } | |
a8566662 FF |
908 | |
909 | if (sample_idx < 0) | |
910 | return; | |
911 | ||
912 | sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; | |
913 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
1cd15857 FF |
914 | rate->count = 1; |
915 | ||
916 | if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { | |
917 | int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); | |
918 | rate->idx = mp->cck_rates[idx]; | |
919 | rate->flags = 0; | |
920 | return; | |
921 | } | |
922 | ||
a8566662 | 923 | rate->idx = sample_idx % MCS_GROUP_RATES + |
7a5e3fa2 | 924 | (sample_group->streams - 1) * 8; |
a8566662 | 925 | rate->flags = IEEE80211_TX_RC_MCS | sample_group->flags; |
ec8aa669 FF |
926 | } |
927 | ||
a0497f9f FF |
928 | static void |
929 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
930 | struct ieee80211_supported_band *sband, | |
931 | struct ieee80211_sta *sta) | |
932 | { | |
933 | int i; | |
934 | ||
935 | if (sband->band != IEEE80211_BAND_2GHZ) | |
936 | return; | |
937 | ||
2dfca312 FF |
938 | if (!(mp->hw->flags & IEEE80211_HW_SUPPORTS_HT_CCK_RATES)) |
939 | return; | |
940 | ||
a0497f9f FF |
941 | mi->cck_supported = 0; |
942 | mi->cck_supported_short = 0; | |
943 | for (i = 0; i < 4; i++) { | |
944 | if (!rate_supported(sta, sband->band, mp->cck_rates[i])) | |
945 | continue; | |
946 | ||
947 | mi->cck_supported |= BIT(i); | |
948 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
949 | mi->cck_supported_short |= BIT(i); | |
950 | } | |
951 | ||
952 | mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported; | |
953 | } | |
954 | ||
ec8aa669 FF |
955 | static void |
956 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 957 | struct cfg80211_chan_def *chandef, |
64f68e5d | 958 | struct ieee80211_sta *sta, void *priv_sta) |
ec8aa669 FF |
959 | { |
960 | struct minstrel_priv *mp = priv; | |
961 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
962 | struct minstrel_ht_sta *mi = &msp->ht; | |
963 | struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; | |
ec8aa669 | 964 | u16 sta_cap = sta->ht_cap.cap; |
4dc217df | 965 | int n_supported = 0; |
ec8aa669 FF |
966 | int ack_dur; |
967 | int stbc; | |
968 | int i; | |
969 | ||
970 | /* fall back to the old minstrel for legacy stations */ | |
4dc217df FF |
971 | if (!sta->ht_cap.ht_supported) |
972 | goto use_legacy; | |
ec8aa669 FF |
973 | |
974 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != | |
a0497f9f | 975 | MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS + 1); |
ec8aa669 FF |
976 | |
977 | msp->is_ht = true; | |
978 | memset(mi, 0, sizeof(*mi)); | |
a8566662 FF |
979 | |
980 | mi->sta = sta; | |
ec8aa669 FF |
981 | mi->stats_update = jiffies; |
982 | ||
438b61b7 SW |
983 | ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); |
984 | mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); | |
985 | mi->overhead += ack_dur; | |
ec8aa669 FF |
986 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
987 | ||
988 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); | |
989 | ||
990 | /* When using MRR, sample more on the first attempt, without delay */ | |
991 | if (mp->has_mrr) { | |
992 | mi->sample_count = 16; | |
993 | mi->sample_wait = 0; | |
994 | } else { | |
995 | mi->sample_count = 8; | |
996 | mi->sample_wait = 8; | |
997 | } | |
998 | mi->sample_tries = 4; | |
999 | ||
1000 | stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >> | |
1001 | IEEE80211_HT_CAP_RX_STBC_SHIFT; | |
1002 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; | |
1003 | ||
1004 | if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) | |
1005 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; | |
1006 | ||
ec8aa669 | 1007 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
ec8aa669 | 1008 | mi->groups[i].supported = 0; |
a0497f9f FF |
1009 | if (i == MINSTREL_CCK_GROUP) { |
1010 | minstrel_ht_update_cck(mp, mi, sband, sta); | |
1011 | continue; | |
1012 | } | |
1013 | ||
ec8aa669 | 1014 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) { |
e1a0c6b3 JB |
1015 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
1016 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_40)) | |
1017 | continue; | |
1018 | } else { | |
1019 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_20)) | |
1020 | continue; | |
1021 | } | |
ec8aa669 FF |
1022 | } |
1023 | ||
e1a0c6b3 JB |
1024 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
1025 | sta->bandwidth < IEEE80211_STA_RX_BW_40) | |
ec8aa669 FF |
1026 | continue; |
1027 | ||
e9219779 | 1028 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
af0ed69b | 1029 | if (sta->smps_mode == IEEE80211_SMPS_STATIC && |
e9219779 HS |
1030 | minstrel_mcs_groups[i].streams > 1) |
1031 | continue; | |
1032 | ||
ec8aa669 FF |
1033 | mi->groups[i].supported = |
1034 | mcs->rx_mask[minstrel_mcs_groups[i].streams - 1]; | |
4dc217df FF |
1035 | |
1036 | if (mi->groups[i].supported) | |
1037 | n_supported++; | |
ec8aa669 | 1038 | } |
4dc217df FF |
1039 | |
1040 | if (!n_supported) | |
1041 | goto use_legacy; | |
1042 | ||
a8566662 | 1043 | /* create an initial rate table with the lowest supported rates */ |
a3647362 | 1044 | minstrel_ht_update_stats(mp, mi); |
a8566662 | 1045 | minstrel_ht_update_rates(mp, mi); |
a3647362 | 1046 | |
4dc217df FF |
1047 | return; |
1048 | ||
1049 | use_legacy: | |
1050 | msp->is_ht = false; | |
1051 | memset(&msp->legacy, 0, sizeof(msp->legacy)); | |
1052 | msp->legacy.r = msp->ratelist; | |
1053 | msp->legacy.sample_table = msp->sample_table; | |
3de805cf SW |
1054 | return mac80211_minstrel.rate_init(priv, sband, chandef, sta, |
1055 | &msp->legacy); | |
ec8aa669 FF |
1056 | } |
1057 | ||
1058 | static void | |
1059 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1060 | struct cfg80211_chan_def *chandef, |
ec8aa669 FF |
1061 | struct ieee80211_sta *sta, void *priv_sta) |
1062 | { | |
3de805cf | 1063 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1064 | } |
1065 | ||
1066 | static void | |
1067 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 1068 | struct cfg80211_chan_def *chandef, |
ec8aa669 | 1069 | struct ieee80211_sta *sta, void *priv_sta, |
64f68e5d | 1070 | u32 changed) |
ec8aa669 | 1071 | { |
3de805cf | 1072 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
1073 | } |
1074 | ||
1075 | static void * | |
1076 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) | |
1077 | { | |
1078 | struct ieee80211_supported_band *sband; | |
1079 | struct minstrel_ht_sta_priv *msp; | |
1080 | struct minstrel_priv *mp = priv; | |
1081 | struct ieee80211_hw *hw = mp->hw; | |
1082 | int max_rates = 0; | |
1083 | int i; | |
1084 | ||
1085 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
1086 | sband = hw->wiphy->bands[i]; | |
1087 | if (sband && sband->n_bitrates > max_rates) | |
1088 | max_rates = sband->n_bitrates; | |
1089 | } | |
1090 | ||
472dd35c | 1091 | msp = kzalloc(sizeof(*msp), gfp); |
ec8aa669 FF |
1092 | if (!msp) |
1093 | return NULL; | |
1094 | ||
1095 | msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); | |
1096 | if (!msp->ratelist) | |
1097 | goto error; | |
1098 | ||
1099 | msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp); | |
1100 | if (!msp->sample_table) | |
1101 | goto error1; | |
1102 | ||
1103 | return msp; | |
1104 | ||
1105 | error1: | |
7e988014 | 1106 | kfree(msp->ratelist); |
ec8aa669 FF |
1107 | error: |
1108 | kfree(msp); | |
1109 | return NULL; | |
1110 | } | |
1111 | ||
1112 | static void | |
1113 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) | |
1114 | { | |
1115 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1116 | ||
1117 | kfree(msp->sample_table); | |
1118 | kfree(msp->ratelist); | |
1119 | kfree(msp); | |
1120 | } | |
1121 | ||
1122 | static void * | |
1123 | minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
1124 | { | |
1125 | return mac80211_minstrel.alloc(hw, debugfsdir); | |
1126 | } | |
1127 | ||
1128 | static void | |
1129 | minstrel_ht_free(void *priv) | |
1130 | { | |
1131 | mac80211_minstrel.free(priv); | |
1132 | } | |
1133 | ||
cca674d4 AQ |
1134 | static u32 minstrel_ht_get_expected_throughput(void *priv_sta) |
1135 | { | |
1136 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1137 | struct minstrel_ht_sta *mi = &msp->ht; | |
1138 | int i, j; | |
1139 | ||
1140 | if (!msp->is_ht) | |
1141 | return mac80211_minstrel.get_expected_throughput(priv_sta); | |
1142 | ||
5935839a TH |
1143 | i = mi->max_tp_rate[0] / MCS_GROUP_RATES; |
1144 | j = mi->max_tp_rate[0] % MCS_GROUP_RATES; | |
cca674d4 AQ |
1145 | |
1146 | /* convert cur_tp from pkt per second in kbps */ | |
1147 | return mi->groups[i].rates[j].cur_tp * AVG_PKT_SIZE * 8 / 1024; | |
1148 | } | |
1149 | ||
631ad703 | 1150 | static const struct rate_control_ops mac80211_minstrel_ht = { |
ec8aa669 FF |
1151 | .name = "minstrel_ht", |
1152 | .tx_status = minstrel_ht_tx_status, | |
1153 | .get_rate = minstrel_ht_get_rate, | |
1154 | .rate_init = minstrel_ht_rate_init, | |
1155 | .rate_update = minstrel_ht_rate_update, | |
1156 | .alloc_sta = minstrel_ht_alloc_sta, | |
1157 | .free_sta = minstrel_ht_free_sta, | |
1158 | .alloc = minstrel_ht_alloc, | |
1159 | .free = minstrel_ht_free, | |
1160 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1161 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, | |
1162 | .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs, | |
1163 | #endif | |
cca674d4 | 1164 | .get_expected_throughput = minstrel_ht_get_expected_throughput, |
ec8aa669 FF |
1165 | }; |
1166 | ||
1167 | ||
f6e1a73b | 1168 | static void __init init_sample_table(void) |
ec8aa669 FF |
1169 | { |
1170 | int col, i, new_idx; | |
1171 | u8 rnd[MCS_GROUP_RATES]; | |
1172 | ||
1173 | memset(sample_table, 0xff, sizeof(sample_table)); | |
1174 | for (col = 0; col < SAMPLE_COLUMNS; col++) { | |
f7d8ad81 | 1175 | prandom_bytes(rnd, sizeof(rnd)); |
ec8aa669 | 1176 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
ec8aa669 | 1177 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
ec8aa669 FF |
1178 | while (sample_table[col][new_idx] != 0xff) |
1179 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; | |
1180 | ||
1181 | sample_table[col][new_idx] = i; | |
1182 | } | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | int __init | |
1187 | rc80211_minstrel_ht_init(void) | |
1188 | { | |
1189 | init_sample_table(); | |
1190 | return ieee80211_rate_control_register(&mac80211_minstrel_ht); | |
1191 | } | |
1192 | ||
1193 | void | |
1194 | rc80211_minstrel_ht_exit(void) | |
1195 | { | |
1196 | ieee80211_rate_control_unregister(&mac80211_minstrel_ht); | |
1197 | } |