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Merge branch 'mac80211' into mac80211-next
[deliverable/linux.git] / net / mac80211 / rc80211_minstrel_ht.c
CommitLineData
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 */
96const 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 127static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly;
ec8aa669 128
a8566662
FF		 129static void
130minstrel_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 */
135static int
136minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate)
137{
cc61d8df 138 return GROUP_IDX((rate->idx / 8) + 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		 143static struct minstrel_rate_stats *
144minstrel_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		 166static inline struct minstrel_rate_stats *
167minstrel_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 */
176static void
6048d763 177minstrel_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 */
202static void
6048d763 203minstrel_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 */
242static void
243minstrel_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 */
280static void
281minstrel_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 */
322static void
323minstrel_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 */
351static inline void
352minstrel_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 */
383static void
384minstrel_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
479static bool
a0497f9f 480minstrel_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
497static void
498minstrel_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
519static void
5935839a 520minstrel_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
543static void
6048d763 544minstrel_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
566static void
567minstrel_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
651static void
652minstrel_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
710static void
711minstrel_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
750static void
751minstrel_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
778static inline int
779minstrel_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
785static int
786minstrel_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		 852static void
853minstrel_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		 868static void
869minstrel_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		 928static void
929minstrel_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		 955static void
956minstrel_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
1049use_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
1058static void
1059minstrel_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
1066static void
1067minstrel_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
1075static void *
1076minstrel_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
1105error1:
7e988014 1106 kfree(msp->ratelist);
ec8aa669
FF		 1107error:
1108 kfree(msp);
1109 return NULL;
1110}
1111
1112static void
1113minstrel_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
1122static void *
1123minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
1124{
1125 return mac80211_minstrel.alloc(hw, debugfsdir);
1126}
1127
1128static void
1129minstrel_ht_free(void *priv)
1130{
1131 mac80211_minstrel.free(priv);
1132}
1133
cca674d4
AQ		 1134static 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 1150static 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 1168static 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
1186int __init
1187rc80211_minstrel_ht_init(void)
1188{
1189 init_sample_table();
1190 return ieee80211_rate_control_register(&mac80211_minstrel_ht);
1191}
1192
1193void
1194rc80211_minstrel_ht_exit(void)
1195{
1196 ieee80211_rate_control_unregister(&mac80211_minstrel_ht);
1197}
Linux kernel - Deliverables
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