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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 */ | |
25 | #define MCS_NSYMS(bps) ((MCS_NBITS + (bps) - 1) / (bps)) | |
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 */ + \ |
a0497f9f | 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 | ||
ec8aa669 FF |
127 | static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES]; |
128 | ||
ec8aa669 FF |
129 | /* |
130 | * Look up an MCS group index based on mac80211 rate information | |
131 | */ | |
132 | static int | |
133 | minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) | |
134 | { | |
a5f69d94 HS |
135 | return GROUP_IDX((rate->idx / MCS_GROUP_RATES) + 1, |
136 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), | |
137 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); | |
ec8aa669 FF |
138 | } |
139 | ||
a0497f9f FF |
140 | static struct minstrel_rate_stats * |
141 | minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
142 | struct ieee80211_tx_rate *rate) | |
143 | { | |
144 | int group, idx; | |
145 | ||
146 | if (rate->flags & IEEE80211_TX_RC_MCS) { | |
147 | group = minstrel_ht_get_group_idx(rate); | |
148 | idx = rate->idx % MCS_GROUP_RATES; | |
149 | } else { | |
150 | group = MINSTREL_CCK_GROUP; | |
151 | ||
152 | for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) | |
153 | if (rate->idx == mp->cck_rates[idx]) | |
154 | break; | |
155 | ||
156 | /* short preamble */ | |
157 | if (!(mi->groups[group].supported & BIT(idx))) | |
158 | idx += 4; | |
159 | } | |
160 | return &mi->groups[group].rates[idx]; | |
161 | } | |
162 | ||
ec8aa669 FF |
163 | static inline struct minstrel_rate_stats * |
164 | minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) | |
165 | { | |
166 | return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES]; | |
167 | } | |
168 | ||
169 | ||
170 | /* | |
171 | * Recalculate success probabilities and counters for a rate using EWMA | |
172 | */ | |
173 | static void | |
6048d763 | 174 | minstrel_calc_rate_ewma(struct minstrel_rate_stats *mr) |
ec8aa669 FF |
175 | { |
176 | if (unlikely(mr->attempts > 0)) { | |
177 | mr->sample_skipped = 0; | |
178 | mr->cur_prob = MINSTREL_FRAC(mr->success, mr->attempts); | |
179 | if (!mr->att_hist) | |
180 | mr->probability = mr->cur_prob; | |
181 | else | |
182 | mr->probability = minstrel_ewma(mr->probability, | |
183 | mr->cur_prob, EWMA_LEVEL); | |
184 | mr->att_hist += mr->attempts; | |
185 | mr->succ_hist += mr->success; | |
186 | } else { | |
187 | mr->sample_skipped++; | |
188 | } | |
189 | mr->last_success = mr->success; | |
190 | mr->last_attempts = mr->attempts; | |
191 | mr->success = 0; | |
192 | mr->attempts = 0; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Calculate throughput based on the average A-MPDU length, taking into account | |
197 | * the expected number of retransmissions and their expected length | |
198 | */ | |
199 | static void | |
6048d763 | 200 | minstrel_ht_calc_tp(struct minstrel_ht_sta *mi, int group, int rate) |
ec8aa669 FF |
201 | { |
202 | struct minstrel_rate_stats *mr; | |
ed97a13c FF |
203 | unsigned int nsecs = 0; |
204 | unsigned int tp; | |
3e8b1eb2 | 205 | unsigned int prob; |
ec8aa669 FF |
206 | |
207 | mr = &mi->groups[group].rates[rate]; | |
3e8b1eb2 | 208 | prob = mr->probability; |
ec8aa669 | 209 | |
3e8b1eb2 | 210 | if (prob < MINSTREL_FRAC(1, 10)) { |
ec8aa669 FF |
211 | mr->cur_tp = 0; |
212 | return; | |
213 | } | |
214 | ||
3e8b1eb2 FF |
215 | /* |
216 | * For the throughput calculation, limit the probability value to 90% to | |
217 | * account for collision related packet error rate fluctuation | |
218 | */ | |
219 | if (prob > MINSTREL_FRAC(9, 10)) | |
220 | prob = MINSTREL_FRAC(9, 10); | |
221 | ||
a0497f9f | 222 | if (group != MINSTREL_CCK_GROUP) |
ed97a13c | 223 | nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len); |
a0497f9f | 224 | |
ed97a13c FF |
225 | nsecs += minstrel_mcs_groups[group].duration[rate]; |
226 | tp = 1000000 * ((mr->probability * 1000) / nsecs); | |
227 | ||
228 | mr->cur_tp = MINSTREL_TRUNC(tp); | |
ec8aa669 FF |
229 | } |
230 | ||
231 | /* | |
232 | * Update rate statistics and select new primary rates | |
233 | * | |
234 | * Rules for rate selection: | |
235 | * - max_prob_rate must use only one stream, as a tradeoff between delivery | |
236 | * probability and throughput during strong fluctuations | |
237 | * - as long as the max prob rate has a probability of more than 3/4, pick | |
238 | * higher throughput rates, even if the probablity is a bit lower | |
239 | */ | |
240 | static void | |
241 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
242 | { | |
243 | struct minstrel_mcs_group_data *mg; | |
244 | struct minstrel_rate_stats *mr; | |
245 | int cur_prob, cur_prob_tp, cur_tp, cur_tp2; | |
246 | int group, i, index; | |
c2eb5b0f | 247 | bool mi_rates_valid = false; |
ec8aa669 FF |
248 | |
249 | if (mi->ampdu_packets > 0) { | |
250 | mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, | |
251 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL); | |
252 | mi->ampdu_len = 0; | |
253 | mi->ampdu_packets = 0; | |
254 | } | |
255 | ||
256 | mi->sample_slow = 0; | |
257 | mi->sample_count = 0; | |
ec8aa669 FF |
258 | |
259 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
c2eb5b0f KB |
260 | bool mg_rates_valid = false; |
261 | ||
ec8aa669 FF |
262 | cur_prob = 0; |
263 | cur_prob_tp = 0; | |
264 | cur_tp = 0; | |
265 | cur_tp2 = 0; | |
266 | ||
267 | mg = &mi->groups[group]; | |
268 | if (!mg->supported) | |
269 | continue; | |
270 | ||
ec8aa669 FF |
271 | mi->sample_count++; |
272 | ||
273 | for (i = 0; i < MCS_GROUP_RATES; i++) { | |
274 | if (!(mg->supported & BIT(i))) | |
275 | continue; | |
276 | ||
c2eb5b0f KB |
277 | /* initialize rates selections starting indexes */ |
278 | if (!mg_rates_valid) { | |
279 | mg->max_tp_rate = mg->max_tp_rate2 = | |
280 | mg->max_prob_rate = i; | |
281 | if (!mi_rates_valid) { | |
282 | mi->max_tp_rate = mi->max_tp_rate2 = | |
283 | mi->max_prob_rate = i; | |
284 | mi_rates_valid = true; | |
285 | } | |
286 | mg_rates_valid = true; | |
287 | } | |
288 | ||
ec8aa669 FF |
289 | mr = &mg->rates[i]; |
290 | mr->retry_updated = false; | |
291 | index = MCS_GROUP_RATES * group + i; | |
6048d763 PK |
292 | minstrel_calc_rate_ewma(mr); |
293 | minstrel_ht_calc_tp(mi, group, i); | |
ec8aa669 FF |
294 | |
295 | if (!mr->cur_tp) | |
296 | continue; | |
297 | ||
ec8aa669 FF |
298 | if ((mr->cur_tp > cur_prob_tp && mr->probability > |
299 | MINSTREL_FRAC(3, 4)) || mr->probability > cur_prob) { | |
300 | mg->max_prob_rate = index; | |
301 | cur_prob = mr->probability; | |
009271f9 | 302 | cur_prob_tp = mr->cur_tp; |
ec8aa669 FF |
303 | } |
304 | ||
305 | if (mr->cur_tp > cur_tp) { | |
306 | swap(index, mg->max_tp_rate); | |
307 | cur_tp = mr->cur_tp; | |
308 | mr = minstrel_get_ratestats(mi, index); | |
309 | } | |
310 | ||
311 | if (index >= mg->max_tp_rate) | |
312 | continue; | |
313 | ||
314 | if (mr->cur_tp > cur_tp2) { | |
315 | mg->max_tp_rate2 = index; | |
316 | cur_tp2 = mr->cur_tp; | |
317 | } | |
318 | } | |
319 | } | |
320 | ||
96d4ac3f FF |
321 | /* try to sample all available rates during each interval */ |
322 | mi->sample_count *= 8; | |
ec8aa669 FF |
323 | |
324 | cur_prob = 0; | |
325 | cur_prob_tp = 0; | |
326 | cur_tp = 0; | |
327 | cur_tp2 = 0; | |
328 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
329 | mg = &mi->groups[group]; | |
330 | if (!mg->supported) | |
331 | continue; | |
332 | ||
ec8aa669 FF |
333 | mr = minstrel_get_ratestats(mi, mg->max_tp_rate); |
334 | if (cur_tp < mr->cur_tp) { | |
89888e36 LB |
335 | mi->max_tp_rate2 = mi->max_tp_rate; |
336 | cur_tp2 = cur_tp; | |
ec8aa669 FF |
337 | mi->max_tp_rate = mg->max_tp_rate; |
338 | cur_tp = mr->cur_tp; | |
965237ab | 339 | mi->max_prob_streams = minstrel_mcs_groups[group].streams - 1; |
ec8aa669 FF |
340 | } |
341 | ||
342 | mr = minstrel_get_ratestats(mi, mg->max_tp_rate2); | |
343 | if (cur_tp2 < mr->cur_tp) { | |
344 | mi->max_tp_rate2 = mg->max_tp_rate2; | |
345 | cur_tp2 = mr->cur_tp; | |
346 | } | |
347 | } | |
348 | ||
965237ab FF |
349 | if (mi->max_prob_streams < 1) |
350 | mi->max_prob_streams = 1; | |
a299c6d5 FF |
351 | |
352 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
353 | mg = &mi->groups[group]; | |
354 | if (!mg->supported) | |
355 | continue; | |
356 | mr = minstrel_get_ratestats(mi, mg->max_prob_rate); | |
357 | if (cur_prob_tp < mr->cur_tp && | |
965237ab | 358 | minstrel_mcs_groups[group].streams <= mi->max_prob_streams) { |
a299c6d5 FF |
359 | mi->max_prob_rate = mg->max_prob_rate; |
360 | cur_prob = mr->cur_prob; | |
361 | cur_prob_tp = mr->cur_tp; | |
362 | } | |
363 | } | |
364 | ||
365 | ||
ec8aa669 FF |
366 | mi->stats_update = jiffies; |
367 | } | |
368 | ||
369 | static bool | |
a0497f9f | 370 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
ec8aa669 | 371 | { |
b79296be | 372 | if (rate->idx < 0) |
ec8aa669 FF |
373 | return false; |
374 | ||
b79296be | 375 | if (!rate->count) |
ec8aa669 FF |
376 | return false; |
377 | ||
a0497f9f FF |
378 | if (rate->flags & IEEE80211_TX_RC_MCS) |
379 | return true; | |
380 | ||
381 | return rate->idx == mp->cck_rates[0] || | |
382 | rate->idx == mp->cck_rates[1] || | |
383 | rate->idx == mp->cck_rates[2] || | |
384 | rate->idx == mp->cck_rates[3]; | |
ec8aa669 FF |
385 | } |
386 | ||
387 | static void | |
388 | minstrel_next_sample_idx(struct minstrel_ht_sta *mi) | |
389 | { | |
390 | struct minstrel_mcs_group_data *mg; | |
391 | ||
392 | for (;;) { | |
393 | mi->sample_group++; | |
394 | mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); | |
395 | mg = &mi->groups[mi->sample_group]; | |
396 | ||
397 | if (!mg->supported) | |
398 | continue; | |
399 | ||
400 | if (++mg->index >= MCS_GROUP_RATES) { | |
401 | mg->index = 0; | |
402 | if (++mg->column >= ARRAY_SIZE(sample_table)) | |
403 | mg->column = 0; | |
404 | } | |
405 | break; | |
406 | } | |
407 | } | |
408 | ||
409 | static void | |
d5ece215 JL |
410 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, unsigned int *idx, |
411 | bool primary) | |
ec8aa669 FF |
412 | { |
413 | int group, orig_group; | |
414 | ||
415 | orig_group = group = *idx / MCS_GROUP_RATES; | |
416 | while (group > 0) { | |
417 | group--; | |
418 | ||
419 | if (!mi->groups[group].supported) | |
420 | continue; | |
421 | ||
422 | if (minstrel_mcs_groups[group].streams > | |
423 | minstrel_mcs_groups[orig_group].streams) | |
424 | continue; | |
425 | ||
426 | if (primary) | |
427 | *idx = mi->groups[group].max_tp_rate; | |
428 | else | |
429 | *idx = mi->groups[group].max_tp_rate2; | |
430 | break; | |
431 | } | |
432 | } | |
433 | ||
434 | static void | |
6048d763 | 435 | minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
ec8aa669 FF |
436 | { |
437 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
438 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
439 | u16 tid; | |
440 | ||
441 | if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) | |
442 | return; | |
443 | ||
444 | if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) | |
445 | return; | |
446 | ||
447 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
a622ab72 | 448 | if (likely(sta->ampdu_mlme.tid_tx[tid])) |
ec8aa669 FF |
449 | return; |
450 | ||
48124d1a LR |
451 | if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
452 | return; | |
453 | ||
bd2ce6e4 | 454 | ieee80211_start_tx_ba_session(pubsta, tid, 5000); |
ec8aa669 FF |
455 | } |
456 | ||
457 | static void | |
458 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, | |
459 | struct ieee80211_sta *sta, void *priv_sta, | |
460 | struct sk_buff *skb) | |
461 | { | |
462 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
463 | struct minstrel_ht_sta *mi = &msp->ht; | |
464 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
465 | struct ieee80211_tx_rate *ar = info->status.rates; | |
466 | struct minstrel_rate_stats *rate, *rate2; | |
467 | struct minstrel_priv *mp = priv; | |
a544ab7f | 468 | bool last; |
a544ab7f | 469 | int i; |
ec8aa669 FF |
470 | |
471 | if (!msp->is_ht) | |
472 | return mac80211_minstrel.tx_status(priv, sband, sta, &msp->legacy, skb); | |
473 | ||
474 | /* This packet was aggregated but doesn't carry status info */ | |
475 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
476 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
477 | return; | |
478 | ||
15d46f38 BS |
479 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
480 | info->status.ampdu_ack_len = | |
481 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); | |
ec8aa669 FF |
482 | info->status.ampdu_len = 1; |
483 | } | |
484 | ||
485 | mi->ampdu_packets++; | |
486 | mi->ampdu_len += info->status.ampdu_len; | |
487 | ||
488 | if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { | |
c7317e41 | 489 | mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len); |
52c00a37 | 490 | mi->sample_tries = 1; |
ec8aa669 FF |
491 | mi->sample_count--; |
492 | } | |
493 | ||
8d5eab5a | 494 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
ec8aa669 | 495 | mi->sample_packets += info->status.ampdu_len; |
ec8aa669 | 496 | |
a0497f9f | 497 | last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
ec8aa669 FF |
498 | for (i = 0; !last; i++) { |
499 | last = (i == IEEE80211_TX_MAX_RATES - 1) || | |
a0497f9f | 500 | !minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
ec8aa669 | 501 | |
a0497f9f | 502 | rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
ec8aa669 | 503 | |
15d46f38 | 504 | if (last) |
ec8aa669 FF |
505 | rate->success += info->status.ampdu_ack_len; |
506 | ||
507 | rate->attempts += ar[i].count * info->status.ampdu_len; | |
508 | } | |
509 | ||
510 | /* | |
511 | * check for sudden death of spatial multiplexing, | |
512 | * downgrade to a lower number of streams if necessary. | |
513 | */ | |
514 | rate = minstrel_get_ratestats(mi, mi->max_tp_rate); | |
515 | if (rate->attempts > 30 && | |
516 | MINSTREL_FRAC(rate->success, rate->attempts) < | |
517 | MINSTREL_FRAC(20, 100)) | |
518 | minstrel_downgrade_rate(mi, &mi->max_tp_rate, true); | |
519 | ||
520 | rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2); | |
ecc3d5ae ML |
521 | if (rate2->attempts > 30 && |
522 | MINSTREL_FRAC(rate2->success, rate2->attempts) < | |
ec8aa669 FF |
523 | MINSTREL_FRAC(20, 100)) |
524 | minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false); | |
525 | ||
526 | if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) { | |
527 | minstrel_ht_update_stats(mp, mi); | |
a0497f9f FF |
528 | if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
529 | mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) | |
6048d763 | 530 | minstrel_aggr_check(sta, skb); |
ec8aa669 FF |
531 | } |
532 | } | |
533 | ||
534 | static void | |
535 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
536 | int index) | |
537 | { | |
538 | struct minstrel_rate_stats *mr; | |
539 | const struct mcs_group *group; | |
540 | unsigned int tx_time, tx_time_rtscts, tx_time_data; | |
541 | unsigned int cw = mp->cw_min; | |
8fddddff | 542 | unsigned int ctime = 0; |
ec8aa669 FF |
543 | unsigned int t_slot = 9; /* FIXME */ |
544 | unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); | |
a0497f9f | 545 | unsigned int overhead = 0, overhead_rtscts = 0; |
ec8aa669 FF |
546 | |
547 | mr = minstrel_get_ratestats(mi, index); | |
548 | if (mr->probability < MINSTREL_FRAC(1, 10)) { | |
549 | mr->retry_count = 1; | |
550 | mr->retry_count_rtscts = 1; | |
551 | return; | |
552 | } | |
553 | ||
554 | mr->retry_count = 2; | |
555 | mr->retry_count_rtscts = 2; | |
556 | mr->retry_updated = true; | |
557 | ||
558 | group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
ed97a13c | 559 | tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000; |
8fddddff DH |
560 | |
561 | /* Contention time for first 2 tries */ | |
562 | ctime = (t_slot * cw) >> 1; | |
563 | cw = min((cw << 1) | 1, mp->cw_max); | |
564 | ctime += (t_slot * cw) >> 1; | |
565 | cw = min((cw << 1) | 1, mp->cw_max); | |
566 | ||
a0497f9f FF |
567 | if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { |
568 | overhead = mi->overhead; | |
569 | overhead_rtscts = mi->overhead_rtscts; | |
570 | } | |
571 | ||
8fddddff | 572 | /* Total TX time for data and Contention after first 2 tries */ |
a0497f9f FF |
573 | tx_time = ctime + 2 * (overhead + tx_time_data); |
574 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); | |
8fddddff DH |
575 | |
576 | /* See how many more tries we can fit inside segment size */ | |
ec8aa669 | 577 | do { |
8fddddff DH |
578 | /* Contention time for this try */ |
579 | ctime = (t_slot * cw) >> 1; | |
580 | cw = min((cw << 1) | 1, mp->cw_max); | |
581 | ||
582 | /* Total TX time after this try */ | |
a0497f9f FF |
583 | tx_time += ctime + overhead + tx_time_data; |
584 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; | |
8fddddff | 585 | |
ec8aa669 FF |
586 | if (tx_time_rtscts < mp->segment_size) |
587 | mr->retry_count_rtscts++; | |
588 | } while ((tx_time < mp->segment_size) && | |
589 | (++mr->retry_count < mp->max_retry)); | |
590 | } | |
591 | ||
592 | ||
593 | static void | |
594 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
595 | struct ieee80211_tx_rate *rate, int index, | |
ec8aa669 FF |
596 | bool sample, bool rtscts) |
597 | { | |
598 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
599 | struct minstrel_rate_stats *mr; | |
600 | ||
601 | mr = minstrel_get_ratestats(mi, index); | |
602 | if (!mr->retry_updated) | |
603 | minstrel_calc_retransmit(mp, mi, index); | |
604 | ||
c7317e41 FF |
605 | if (sample) |
606 | rate->count = 1; | |
607 | else if (mr->probability < MINSTREL_FRAC(20, 100)) | |
ec8aa669 FF |
608 | rate->count = 2; |
609 | else if (rtscts) | |
610 | rate->count = mr->retry_count_rtscts; | |
611 | else | |
612 | rate->count = mr->retry_count; | |
613 | ||
a0497f9f | 614 | rate->flags = 0; |
9d468d22 | 615 | if (rtscts) |
ec8aa669 | 616 | rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS; |
a0497f9f FF |
617 | |
618 | if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { | |
619 | rate->idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; | |
620 | return; | |
621 | } | |
622 | ||
623 | rate->flags |= IEEE80211_TX_RC_MCS | group->flags; | |
ec8aa669 FF |
624 | rate->idx = index % MCS_GROUP_RATES + (group->streams - 1) * MCS_GROUP_RATES; |
625 | } | |
626 | ||
627 | static inline int | |
628 | minstrel_get_duration(int index) | |
629 | { | |
630 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
631 | return group->duration[index % MCS_GROUP_RATES]; | |
632 | } | |
633 | ||
634 | static int | |
635 | minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
636 | { | |
637 | struct minstrel_rate_stats *mr; | |
638 | struct minstrel_mcs_group_data *mg; | |
965237ab | 639 | unsigned int sample_dur, sample_group; |
ec8aa669 FF |
640 | int sample_idx = 0; |
641 | ||
642 | if (mi->sample_wait > 0) { | |
643 | mi->sample_wait--; | |
644 | return -1; | |
645 | } | |
646 | ||
647 | if (!mi->sample_tries) | |
648 | return -1; | |
649 | ||
ec8aa669 FF |
650 | mg = &mi->groups[mi->sample_group]; |
651 | sample_idx = sample_table[mg->column][mg->index]; | |
652 | mr = &mg->rates[sample_idx]; | |
965237ab FF |
653 | sample_group = mi->sample_group; |
654 | sample_idx += sample_group * MCS_GROUP_RATES; | |
8d5eab5a | 655 | minstrel_next_sample_idx(mi); |
ec8aa669 | 656 | |
ba6fa29c HS |
657 | /* |
658 | * Sampling might add some overhead (RTS, no aggregation) | |
659 | * to the frame. Hence, don't use sampling for the currently | |
a0ca796c | 660 | * used rates. |
ba6fa29c | 661 | */ |
a0ca796c FF |
662 | if (sample_idx == mi->max_tp_rate || |
663 | sample_idx == mi->max_tp_rate2 || | |
664 | sample_idx == mi->max_prob_rate) | |
ba6fa29c | 665 | return -1; |
a0ca796c | 666 | |
ec8aa669 | 667 | /* |
bc96f242 FF |
668 | * Do not sample if the probability is already higher than 95% |
669 | * to avoid wasting airtime. | |
ec8aa669 | 670 | */ |
bc96f242 | 671 | if (mr->probability > MINSTREL_FRAC(95, 100)) |
8d5eab5a | 672 | return -1; |
ec8aa669 FF |
673 | |
674 | /* | |
675 | * Make sure that lower rates get sampled only occasionally, | |
676 | * if the link is working perfectly. | |
677 | */ | |
965237ab FF |
678 | sample_dur = minstrel_get_duration(sample_idx); |
679 | if (sample_dur >= minstrel_get_duration(mi->max_tp_rate2) && | |
680 | (mi->max_prob_streams < | |
681 | minstrel_mcs_groups[sample_group].streams || | |
682 | sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { | |
c7317e41 | 683 | if (mr->sample_skipped < 20) |
8d5eab5a | 684 | return -1; |
ec8aa669 FF |
685 | |
686 | if (mi->sample_slow++ > 2) | |
8d5eab5a | 687 | return -1; |
ec8aa669 | 688 | } |
098b8afb | 689 | mi->sample_tries--; |
ec8aa669 FF |
690 | |
691 | return sample_idx; | |
ec8aa669 FF |
692 | } |
693 | ||
a0497f9f FF |
694 | static void |
695 | minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp, | |
696 | struct minstrel_ht_sta *mi, bool val) | |
697 | { | |
698 | u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported; | |
699 | ||
700 | if (!supported || !mi->cck_supported_short) | |
701 | return; | |
702 | ||
703 | if (supported & (mi->cck_supported_short << (val * 4))) | |
704 | return; | |
705 | ||
706 | supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4); | |
707 | mi->groups[MINSTREL_CCK_GROUP].supported = supported; | |
708 | } | |
709 | ||
ec8aa669 FF |
710 | static void |
711 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, | |
712 | struct ieee80211_tx_rate_control *txrc) | |
713 | { | |
714 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); | |
715 | struct ieee80211_tx_rate *ar = info->status.rates; | |
716 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
717 | struct minstrel_ht_sta *mi = &msp->ht; | |
718 | struct minstrel_priv *mp = priv; | |
719 | int sample_idx; | |
c7317e41 | 720 | bool sample = false; |
ec8aa669 FF |
721 | |
722 | if (rate_control_send_low(sta, priv_sta, txrc)) | |
723 | return; | |
724 | ||
725 | if (!msp->is_ht) | |
726 | return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); | |
727 | ||
728 | info->flags |= mi->tx_flags; | |
a0497f9f | 729 | minstrel_ht_check_cck_shortpreamble(mp, mi, txrc->short_preamble); |
6de062ce HS |
730 | |
731 | /* Don't use EAPOL frames for sampling on non-mrr hw */ | |
732 | if (mp->hw->max_rates == 1 && | |
733 | txrc->skb->protocol == cpu_to_be16(ETH_P_PAE)) | |
734 | sample_idx = -1; | |
735 | else | |
736 | sample_idx = minstrel_get_sample_rate(mp, mi); | |
24f7580e ZK |
737 | |
738 | #ifdef CONFIG_MAC80211_DEBUGFS | |
739 | /* use fixed index if set */ | |
2a9e6c58 SRR |
740 | if (mp->fixed_rate_idx != -1) { |
741 | mi->max_tp_rate = mp->fixed_rate_idx; | |
742 | mi->max_tp_rate2 = mp->fixed_rate_idx; | |
743 | mi->max_prob_rate = mp->fixed_rate_idx; | |
744 | sample_idx = -1; | |
745 | } | |
24f7580e ZK |
746 | #endif |
747 | ||
ec8aa669 | 748 | if (sample_idx >= 0) { |
c7317e41 | 749 | sample = true; |
ec8aa669 | 750 | minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx, |
6048d763 | 751 | true, false); |
ec8aa669 FF |
752 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
753 | } else { | |
754 | minstrel_ht_set_rate(mp, mi, &ar[0], mi->max_tp_rate, | |
6048d763 | 755 | false, false); |
ec8aa669 | 756 | } |
ec8aa669 | 757 | |
cf28d793 HS |
758 | if (mp->hw->max_rates >= 3) { |
759 | /* | |
760 | * At least 3 tx rates supported, use | |
761 | * sample_rate -> max_tp_rate -> max_prob_rate for sampling and | |
762 | * max_tp_rate -> max_tp_rate2 -> max_prob_rate by default. | |
763 | */ | |
764 | if (sample_idx >= 0) | |
765 | minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate, | |
6048d763 | 766 | false, false); |
cf28d793 HS |
767 | else |
768 | minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate2, | |
6048d763 | 769 | false, true); |
cf28d793 HS |
770 | |
771 | minstrel_ht_set_rate(mp, mi, &ar[2], mi->max_prob_rate, | |
6048d763 | 772 | false, !sample); |
cf28d793 HS |
773 | |
774 | ar[3].count = 0; | |
775 | ar[3].idx = -1; | |
776 | } else if (mp->hw->max_rates == 2) { | |
777 | /* | |
778 | * Only 2 tx rates supported, use | |
779 | * sample_rate -> max_prob_rate for sampling and | |
780 | * max_tp_rate -> max_prob_rate by default. | |
781 | */ | |
782 | minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_prob_rate, | |
6048d763 | 783 | false, !sample); |
cf28d793 HS |
784 | |
785 | ar[2].count = 0; | |
786 | ar[2].idx = -1; | |
787 | } else { | |
788 | /* Not using MRR, only use the first rate */ | |
789 | ar[1].count = 0; | |
790 | ar[1].idx = -1; | |
791 | } | |
ec8aa669 FF |
792 | |
793 | mi->total_packets++; | |
794 | ||
795 | /* wraparound */ | |
796 | if (mi->total_packets == ~0) { | |
797 | mi->total_packets = 0; | |
798 | mi->sample_packets = 0; | |
799 | } | |
800 | } | |
801 | ||
a0497f9f FF |
802 | static void |
803 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
804 | struct ieee80211_supported_band *sband, | |
805 | struct ieee80211_sta *sta) | |
806 | { | |
807 | int i; | |
808 | ||
809 | if (sband->band != IEEE80211_BAND_2GHZ) | |
810 | return; | |
811 | ||
812 | mi->cck_supported = 0; | |
813 | mi->cck_supported_short = 0; | |
814 | for (i = 0; i < 4; i++) { | |
815 | if (!rate_supported(sta, sband->band, mp->cck_rates[i])) | |
816 | continue; | |
817 | ||
818 | mi->cck_supported |= BIT(i); | |
819 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
820 | mi->cck_supported_short |= BIT(i); | |
821 | } | |
822 | ||
823 | mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported; | |
824 | } | |
825 | ||
ec8aa669 FF |
826 | static void |
827 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, | |
64f68e5d | 828 | struct ieee80211_sta *sta, void *priv_sta) |
ec8aa669 FF |
829 | { |
830 | struct minstrel_priv *mp = priv; | |
831 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
832 | struct minstrel_ht_sta *mi = &msp->ht; | |
833 | struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; | |
ec8aa669 | 834 | u16 sta_cap = sta->ht_cap.cap; |
4dc217df | 835 | int n_supported = 0; |
ec8aa669 FF |
836 | int ack_dur; |
837 | int stbc; | |
838 | int i; | |
839 | ||
840 | /* fall back to the old minstrel for legacy stations */ | |
4dc217df FF |
841 | if (!sta->ht_cap.ht_supported) |
842 | goto use_legacy; | |
ec8aa669 FF |
843 | |
844 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != | |
a0497f9f | 845 | MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS + 1); |
ec8aa669 FF |
846 | |
847 | msp->is_ht = true; | |
848 | memset(mi, 0, sizeof(*mi)); | |
849 | mi->stats_update = jiffies; | |
850 | ||
4ee73f33 MK |
851 | ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1); |
852 | mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1) + ack_dur; | |
ec8aa669 FF |
853 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
854 | ||
855 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); | |
856 | ||
857 | /* When using MRR, sample more on the first attempt, without delay */ | |
858 | if (mp->has_mrr) { | |
859 | mi->sample_count = 16; | |
860 | mi->sample_wait = 0; | |
861 | } else { | |
862 | mi->sample_count = 8; | |
863 | mi->sample_wait = 8; | |
864 | } | |
865 | mi->sample_tries = 4; | |
866 | ||
867 | stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >> | |
868 | IEEE80211_HT_CAP_RX_STBC_SHIFT; | |
869 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; | |
870 | ||
871 | if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) | |
872 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; | |
873 | ||
ec8aa669 | 874 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
ec8aa669 | 875 | mi->groups[i].supported = 0; |
a0497f9f FF |
876 | if (i == MINSTREL_CCK_GROUP) { |
877 | minstrel_ht_update_cck(mp, mi, sband, sta); | |
878 | continue; | |
879 | } | |
880 | ||
ec8aa669 | 881 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) { |
e1a0c6b3 JB |
882 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
883 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_40)) | |
884 | continue; | |
885 | } else { | |
886 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_20)) | |
887 | continue; | |
888 | } | |
ec8aa669 FF |
889 | } |
890 | ||
e1a0c6b3 JB |
891 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
892 | sta->bandwidth < IEEE80211_STA_RX_BW_40) | |
ec8aa669 FF |
893 | continue; |
894 | ||
e9219779 | 895 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
af0ed69b | 896 | if (sta->smps_mode == IEEE80211_SMPS_STATIC && |
e9219779 HS |
897 | minstrel_mcs_groups[i].streams > 1) |
898 | continue; | |
899 | ||
ec8aa669 FF |
900 | mi->groups[i].supported = |
901 | mcs->rx_mask[minstrel_mcs_groups[i].streams - 1]; | |
4dc217df FF |
902 | |
903 | if (mi->groups[i].supported) | |
904 | n_supported++; | |
ec8aa669 | 905 | } |
4dc217df FF |
906 | |
907 | if (!n_supported) | |
908 | goto use_legacy; | |
909 | ||
910 | return; | |
911 | ||
912 | use_legacy: | |
913 | msp->is_ht = false; | |
914 | memset(&msp->legacy, 0, sizeof(msp->legacy)); | |
915 | msp->legacy.r = msp->ratelist; | |
916 | msp->legacy.sample_table = msp->sample_table; | |
917 | return mac80211_minstrel.rate_init(priv, sband, sta, &msp->legacy); | |
ec8aa669 FF |
918 | } |
919 | ||
920 | static void | |
921 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
922 | struct ieee80211_sta *sta, void *priv_sta) | |
923 | { | |
64f68e5d | 924 | minstrel_ht_update_caps(priv, sband, sta, priv_sta); |
ec8aa669 FF |
925 | } |
926 | ||
927 | static void | |
928 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, | |
929 | struct ieee80211_sta *sta, void *priv_sta, | |
64f68e5d | 930 | u32 changed) |
ec8aa669 | 931 | { |
64f68e5d | 932 | minstrel_ht_update_caps(priv, sband, sta, priv_sta); |
ec8aa669 FF |
933 | } |
934 | ||
935 | static void * | |
936 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) | |
937 | { | |
938 | struct ieee80211_supported_band *sband; | |
939 | struct minstrel_ht_sta_priv *msp; | |
940 | struct minstrel_priv *mp = priv; | |
941 | struct ieee80211_hw *hw = mp->hw; | |
942 | int max_rates = 0; | |
943 | int i; | |
944 | ||
945 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
946 | sband = hw->wiphy->bands[i]; | |
947 | if (sband && sband->n_bitrates > max_rates) | |
948 | max_rates = sband->n_bitrates; | |
949 | } | |
950 | ||
472dd35c | 951 | msp = kzalloc(sizeof(*msp), gfp); |
ec8aa669 FF |
952 | if (!msp) |
953 | return NULL; | |
954 | ||
955 | msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); | |
956 | if (!msp->ratelist) | |
957 | goto error; | |
958 | ||
959 | msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp); | |
960 | if (!msp->sample_table) | |
961 | goto error1; | |
962 | ||
963 | return msp; | |
964 | ||
965 | error1: | |
7e988014 | 966 | kfree(msp->ratelist); |
ec8aa669 FF |
967 | error: |
968 | kfree(msp); | |
969 | return NULL; | |
970 | } | |
971 | ||
972 | static void | |
973 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) | |
974 | { | |
975 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
976 | ||
977 | kfree(msp->sample_table); | |
978 | kfree(msp->ratelist); | |
979 | kfree(msp); | |
980 | } | |
981 | ||
982 | static void * | |
983 | minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
984 | { | |
985 | return mac80211_minstrel.alloc(hw, debugfsdir); | |
986 | } | |
987 | ||
988 | static void | |
989 | minstrel_ht_free(void *priv) | |
990 | { | |
991 | mac80211_minstrel.free(priv); | |
992 | } | |
993 | ||
994 | static struct rate_control_ops mac80211_minstrel_ht = { | |
995 | .name = "minstrel_ht", | |
996 | .tx_status = minstrel_ht_tx_status, | |
997 | .get_rate = minstrel_ht_get_rate, | |
998 | .rate_init = minstrel_ht_rate_init, | |
999 | .rate_update = minstrel_ht_rate_update, | |
1000 | .alloc_sta = minstrel_ht_alloc_sta, | |
1001 | .free_sta = minstrel_ht_free_sta, | |
1002 | .alloc = minstrel_ht_alloc, | |
1003 | .free = minstrel_ht_free, | |
1004 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1005 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, | |
1006 | .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs, | |
1007 | #endif | |
1008 | }; | |
1009 | ||
1010 | ||
1011 | static void | |
1012 | init_sample_table(void) | |
1013 | { | |
1014 | int col, i, new_idx; | |
1015 | u8 rnd[MCS_GROUP_RATES]; | |
1016 | ||
1017 | memset(sample_table, 0xff, sizeof(sample_table)); | |
1018 | for (col = 0; col < SAMPLE_COLUMNS; col++) { | |
1019 | for (i = 0; i < MCS_GROUP_RATES; i++) { | |
1020 | get_random_bytes(rnd, sizeof(rnd)); | |
1021 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; | |
1022 | ||
1023 | while (sample_table[col][new_idx] != 0xff) | |
1024 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; | |
1025 | ||
1026 | sample_table[col][new_idx] = i; | |
1027 | } | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | int __init | |
1032 | rc80211_minstrel_ht_init(void) | |
1033 | { | |
1034 | init_sample_table(); | |
1035 | return ieee80211_rate_control_register(&mac80211_minstrel_ht); | |
1036 | } | |
1037 | ||
1038 | void | |
1039 | rc80211_minstrel_ht_exit(void) | |
1040 | { | |
1041 | ieee80211_rate_control_unregister(&mac80211_minstrel_ht); | |
1042 | } |