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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 | ||
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 | { | |
7a5e3fa2 | 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 |
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 FF |
228 | nsecs += minstrel_mcs_groups[group].duration[rate]; |
229 | tp = 1000000 * ((mr->probability * 1000) / nsecs); | |
230 | ||
231 | mr->cur_tp = MINSTREL_TRUNC(tp); | |
ec8aa669 FF |
232 | } |
233 | ||
234 | /* | |
235 | * Update rate statistics and select new primary rates | |
236 | * | |
237 | * Rules for rate selection: | |
238 | * - max_prob_rate must use only one stream, as a tradeoff between delivery | |
239 | * probability and throughput during strong fluctuations | |
240 | * - as long as the max prob rate has a probability of more than 3/4, pick | |
241 | * higher throughput rates, even if the probablity is a bit lower | |
242 | */ | |
243 | static void | |
244 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
245 | { | |
246 | struct minstrel_mcs_group_data *mg; | |
247 | struct minstrel_rate_stats *mr; | |
248 | int cur_prob, cur_prob_tp, cur_tp, cur_tp2; | |
249 | int group, i, index; | |
c2eb5b0f | 250 | bool mi_rates_valid = false; |
ec8aa669 FF |
251 | |
252 | if (mi->ampdu_packets > 0) { | |
253 | mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, | |
254 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL); | |
255 | mi->ampdu_len = 0; | |
256 | mi->ampdu_packets = 0; | |
257 | } | |
258 | ||
259 | mi->sample_slow = 0; | |
260 | mi->sample_count = 0; | |
ec8aa669 FF |
261 | |
262 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
c2eb5b0f KB |
263 | bool mg_rates_valid = false; |
264 | ||
ec8aa669 FF |
265 | cur_prob = 0; |
266 | cur_prob_tp = 0; | |
267 | cur_tp = 0; | |
268 | cur_tp2 = 0; | |
269 | ||
270 | mg = &mi->groups[group]; | |
271 | if (!mg->supported) | |
272 | continue; | |
273 | ||
ec8aa669 FF |
274 | mi->sample_count++; |
275 | ||
276 | for (i = 0; i < MCS_GROUP_RATES; i++) { | |
277 | if (!(mg->supported & BIT(i))) | |
278 | continue; | |
279 | ||
c2eb5b0f KB |
280 | /* initialize rates selections starting indexes */ |
281 | if (!mg_rates_valid) { | |
282 | mg->max_tp_rate = mg->max_tp_rate2 = | |
283 | mg->max_prob_rate = i; | |
284 | if (!mi_rates_valid) { | |
285 | mi->max_tp_rate = mi->max_tp_rate2 = | |
286 | mi->max_prob_rate = i; | |
287 | mi_rates_valid = true; | |
288 | } | |
289 | mg_rates_valid = true; | |
290 | } | |
291 | ||
ec8aa669 FF |
292 | mr = &mg->rates[i]; |
293 | mr->retry_updated = false; | |
294 | index = MCS_GROUP_RATES * group + i; | |
6048d763 PK |
295 | minstrel_calc_rate_ewma(mr); |
296 | minstrel_ht_calc_tp(mi, group, i); | |
ec8aa669 FF |
297 | |
298 | if (!mr->cur_tp) | |
299 | continue; | |
300 | ||
ec8aa669 FF |
301 | if ((mr->cur_tp > cur_prob_tp && mr->probability > |
302 | MINSTREL_FRAC(3, 4)) || mr->probability > cur_prob) { | |
303 | mg->max_prob_rate = index; | |
304 | cur_prob = mr->probability; | |
009271f9 | 305 | cur_prob_tp = mr->cur_tp; |
ec8aa669 FF |
306 | } |
307 | ||
308 | if (mr->cur_tp > cur_tp) { | |
309 | swap(index, mg->max_tp_rate); | |
310 | cur_tp = mr->cur_tp; | |
311 | mr = minstrel_get_ratestats(mi, index); | |
312 | } | |
313 | ||
314 | if (index >= mg->max_tp_rate) | |
315 | continue; | |
316 | ||
317 | if (mr->cur_tp > cur_tp2) { | |
318 | mg->max_tp_rate2 = index; | |
319 | cur_tp2 = mr->cur_tp; | |
320 | } | |
321 | } | |
322 | } | |
323 | ||
96d4ac3f FF |
324 | /* try to sample all available rates during each interval */ |
325 | mi->sample_count *= 8; | |
ec8aa669 FF |
326 | |
327 | cur_prob = 0; | |
328 | cur_prob_tp = 0; | |
329 | cur_tp = 0; | |
330 | cur_tp2 = 0; | |
331 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
332 | mg = &mi->groups[group]; | |
333 | if (!mg->supported) | |
334 | continue; | |
335 | ||
ec8aa669 FF |
336 | mr = minstrel_get_ratestats(mi, mg->max_tp_rate); |
337 | if (cur_tp < mr->cur_tp) { | |
89888e36 LB |
338 | mi->max_tp_rate2 = mi->max_tp_rate; |
339 | cur_tp2 = cur_tp; | |
ec8aa669 FF |
340 | mi->max_tp_rate = mg->max_tp_rate; |
341 | cur_tp = mr->cur_tp; | |
965237ab | 342 | mi->max_prob_streams = minstrel_mcs_groups[group].streams - 1; |
ec8aa669 FF |
343 | } |
344 | ||
345 | mr = minstrel_get_ratestats(mi, mg->max_tp_rate2); | |
346 | if (cur_tp2 < mr->cur_tp) { | |
347 | mi->max_tp_rate2 = mg->max_tp_rate2; | |
348 | cur_tp2 = mr->cur_tp; | |
349 | } | |
350 | } | |
351 | ||
965237ab FF |
352 | if (mi->max_prob_streams < 1) |
353 | mi->max_prob_streams = 1; | |
a299c6d5 FF |
354 | |
355 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { | |
356 | mg = &mi->groups[group]; | |
357 | if (!mg->supported) | |
358 | continue; | |
359 | mr = minstrel_get_ratestats(mi, mg->max_prob_rate); | |
360 | if (cur_prob_tp < mr->cur_tp && | |
965237ab | 361 | minstrel_mcs_groups[group].streams <= mi->max_prob_streams) { |
a299c6d5 FF |
362 | mi->max_prob_rate = mg->max_prob_rate; |
363 | cur_prob = mr->cur_prob; | |
364 | cur_prob_tp = mr->cur_tp; | |
365 | } | |
366 | } | |
367 | ||
37feb7e2 LB |
368 | #ifdef CONFIG_MAC80211_DEBUGFS |
369 | /* use fixed index if set */ | |
370 | if (mp->fixed_rate_idx != -1) { | |
371 | mi->max_tp_rate = mp->fixed_rate_idx; | |
372 | mi->max_tp_rate2 = mp->fixed_rate_idx; | |
373 | mi->max_prob_rate = mp->fixed_rate_idx; | |
374 | } | |
375 | #endif | |
a299c6d5 | 376 | |
ec8aa669 FF |
377 | mi->stats_update = jiffies; |
378 | } | |
379 | ||
380 | static bool | |
a0497f9f | 381 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
ec8aa669 | 382 | { |
b79296be | 383 | if (rate->idx < 0) |
ec8aa669 FF |
384 | return false; |
385 | ||
b79296be | 386 | if (!rate->count) |
ec8aa669 FF |
387 | return false; |
388 | ||
a0497f9f FF |
389 | if (rate->flags & IEEE80211_TX_RC_MCS) |
390 | return true; | |
391 | ||
392 | return rate->idx == mp->cck_rates[0] || | |
393 | rate->idx == mp->cck_rates[1] || | |
394 | rate->idx == mp->cck_rates[2] || | |
395 | rate->idx == mp->cck_rates[3]; | |
ec8aa669 FF |
396 | } |
397 | ||
398 | static void | |
399 | minstrel_next_sample_idx(struct minstrel_ht_sta *mi) | |
400 | { | |
401 | struct minstrel_mcs_group_data *mg; | |
402 | ||
403 | for (;;) { | |
404 | mi->sample_group++; | |
405 | mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); | |
406 | mg = &mi->groups[mi->sample_group]; | |
407 | ||
408 | if (!mg->supported) | |
409 | continue; | |
410 | ||
411 | if (++mg->index >= MCS_GROUP_RATES) { | |
412 | mg->index = 0; | |
413 | if (++mg->column >= ARRAY_SIZE(sample_table)) | |
414 | mg->column = 0; | |
415 | } | |
416 | break; | |
417 | } | |
418 | } | |
419 | ||
420 | static void | |
d5ece215 JL |
421 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, unsigned int *idx, |
422 | bool primary) | |
ec8aa669 FF |
423 | { |
424 | int group, orig_group; | |
425 | ||
426 | orig_group = group = *idx / MCS_GROUP_RATES; | |
427 | while (group > 0) { | |
428 | group--; | |
429 | ||
430 | if (!mi->groups[group].supported) | |
431 | continue; | |
432 | ||
433 | if (minstrel_mcs_groups[group].streams > | |
434 | minstrel_mcs_groups[orig_group].streams) | |
435 | continue; | |
436 | ||
437 | if (primary) | |
438 | *idx = mi->groups[group].max_tp_rate; | |
439 | else | |
440 | *idx = mi->groups[group].max_tp_rate2; | |
441 | break; | |
442 | } | |
443 | } | |
444 | ||
445 | static void | |
6048d763 | 446 | minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
ec8aa669 FF |
447 | { |
448 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
449 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
450 | u16 tid; | |
451 | ||
452 | if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) | |
453 | return; | |
454 | ||
e133fae2 | 455 | if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) |
ec8aa669 FF |
456 | return; |
457 | ||
458 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
a622ab72 | 459 | if (likely(sta->ampdu_mlme.tid_tx[tid])) |
ec8aa669 FF |
460 | return; |
461 | ||
48124d1a LR |
462 | if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
463 | return; | |
464 | ||
bd2ce6e4 | 465 | ieee80211_start_tx_ba_session(pubsta, tid, 5000); |
ec8aa669 FF |
466 | } |
467 | ||
468 | static void | |
469 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, | |
470 | struct ieee80211_sta *sta, void *priv_sta, | |
471 | struct sk_buff *skb) | |
472 | { | |
473 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
474 | struct minstrel_ht_sta *mi = &msp->ht; | |
475 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
476 | struct ieee80211_tx_rate *ar = info->status.rates; | |
477 | struct minstrel_rate_stats *rate, *rate2; | |
478 | struct minstrel_priv *mp = priv; | |
a8566662 | 479 | bool last, update = false; |
a544ab7f | 480 | int i; |
ec8aa669 FF |
481 | |
482 | if (!msp->is_ht) | |
483 | return mac80211_minstrel.tx_status(priv, sband, sta, &msp->legacy, skb); | |
484 | ||
485 | /* This packet was aggregated but doesn't carry status info */ | |
486 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
487 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
488 | return; | |
489 | ||
15d46f38 BS |
490 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
491 | info->status.ampdu_ack_len = | |
492 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); | |
ec8aa669 FF |
493 | info->status.ampdu_len = 1; |
494 | } | |
495 | ||
496 | mi->ampdu_packets++; | |
497 | mi->ampdu_len += info->status.ampdu_len; | |
498 | ||
499 | if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { | |
c7317e41 | 500 | mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len); |
52c00a37 | 501 | mi->sample_tries = 1; |
ec8aa669 FF |
502 | mi->sample_count--; |
503 | } | |
504 | ||
8d5eab5a | 505 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
ec8aa669 | 506 | mi->sample_packets += info->status.ampdu_len; |
ec8aa669 | 507 | |
a0497f9f | 508 | last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
ec8aa669 FF |
509 | for (i = 0; !last; i++) { |
510 | last = (i == IEEE80211_TX_MAX_RATES - 1) || | |
a0497f9f | 511 | !minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
ec8aa669 | 512 | |
a0497f9f | 513 | rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
ec8aa669 | 514 | |
15d46f38 | 515 | if (last) |
ec8aa669 FF |
516 | rate->success += info->status.ampdu_ack_len; |
517 | ||
518 | rate->attempts += ar[i].count * info->status.ampdu_len; | |
519 | } | |
520 | ||
521 | /* | |
522 | * check for sudden death of spatial multiplexing, | |
523 | * downgrade to a lower number of streams if necessary. | |
524 | */ | |
525 | rate = minstrel_get_ratestats(mi, mi->max_tp_rate); | |
526 | if (rate->attempts > 30 && | |
527 | MINSTREL_FRAC(rate->success, rate->attempts) < | |
a8566662 | 528 | MINSTREL_FRAC(20, 100)) { |
ec8aa669 | 529 | minstrel_downgrade_rate(mi, &mi->max_tp_rate, true); |
a8566662 FF |
530 | update = true; |
531 | } | |
ec8aa669 FF |
532 | |
533 | rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2); | |
ecc3d5ae ML |
534 | if (rate2->attempts > 30 && |
535 | MINSTREL_FRAC(rate2->success, rate2->attempts) < | |
a8566662 | 536 | MINSTREL_FRAC(20, 100)) { |
ec8aa669 | 537 | minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false); |
a8566662 FF |
538 | update = true; |
539 | } | |
ec8aa669 FF |
540 | |
541 | if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) { | |
a8566662 | 542 | update = true; |
ec8aa669 | 543 | minstrel_ht_update_stats(mp, mi); |
a0497f9f FF |
544 | if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
545 | mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) | |
6048d763 | 546 | minstrel_aggr_check(sta, skb); |
ec8aa669 | 547 | } |
a8566662 FF |
548 | |
549 | if (update) | |
550 | minstrel_ht_update_rates(mp, mi); | |
ec8aa669 FF |
551 | } |
552 | ||
553 | static void | |
554 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
555 | int index) | |
556 | { | |
557 | struct minstrel_rate_stats *mr; | |
558 | const struct mcs_group *group; | |
559 | unsigned int tx_time, tx_time_rtscts, tx_time_data; | |
560 | unsigned int cw = mp->cw_min; | |
8fddddff | 561 | unsigned int ctime = 0; |
ec8aa669 FF |
562 | unsigned int t_slot = 9; /* FIXME */ |
563 | unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); | |
a0497f9f | 564 | unsigned int overhead = 0, overhead_rtscts = 0; |
ec8aa669 FF |
565 | |
566 | mr = minstrel_get_ratestats(mi, index); | |
567 | if (mr->probability < MINSTREL_FRAC(1, 10)) { | |
568 | mr->retry_count = 1; | |
569 | mr->retry_count_rtscts = 1; | |
570 | return; | |
571 | } | |
572 | ||
573 | mr->retry_count = 2; | |
574 | mr->retry_count_rtscts = 2; | |
575 | mr->retry_updated = true; | |
576 | ||
577 | group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
ed97a13c | 578 | tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000; |
8fddddff DH |
579 | |
580 | /* Contention time for first 2 tries */ | |
581 | ctime = (t_slot * cw) >> 1; | |
582 | cw = min((cw << 1) | 1, mp->cw_max); | |
583 | ctime += (t_slot * cw) >> 1; | |
584 | cw = min((cw << 1) | 1, mp->cw_max); | |
585 | ||
a0497f9f FF |
586 | if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { |
587 | overhead = mi->overhead; | |
588 | overhead_rtscts = mi->overhead_rtscts; | |
589 | } | |
590 | ||
8fddddff | 591 | /* Total TX time for data and Contention after first 2 tries */ |
a0497f9f FF |
592 | tx_time = ctime + 2 * (overhead + tx_time_data); |
593 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); | |
8fddddff DH |
594 | |
595 | /* See how many more tries we can fit inside segment size */ | |
ec8aa669 | 596 | do { |
8fddddff DH |
597 | /* Contention time for this try */ |
598 | ctime = (t_slot * cw) >> 1; | |
599 | cw = min((cw << 1) | 1, mp->cw_max); | |
600 | ||
601 | /* Total TX time after this try */ | |
a0497f9f FF |
602 | tx_time += ctime + overhead + tx_time_data; |
603 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; | |
8fddddff | 604 | |
ec8aa669 FF |
605 | if (tx_time_rtscts < mp->segment_size) |
606 | mr->retry_count_rtscts++; | |
607 | } while ((tx_time < mp->segment_size) && | |
608 | (++mr->retry_count < mp->max_retry)); | |
609 | } | |
610 | ||
611 | ||
612 | static void | |
613 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
a8566662 | 614 | struct ieee80211_sta_rates *ratetbl, int offset, int index) |
ec8aa669 FF |
615 | { |
616 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
617 | struct minstrel_rate_stats *mr; | |
a8566662 FF |
618 | u8 idx; |
619 | u16 flags; | |
ec8aa669 FF |
620 | |
621 | mr = minstrel_get_ratestats(mi, index); | |
622 | if (!mr->retry_updated) | |
623 | minstrel_calc_retransmit(mp, mi, index); | |
624 | ||
a8566662 FF |
625 | if (mr->probability < MINSTREL_FRAC(20, 100) || !mr->retry_count) { |
626 | ratetbl->rate[offset].count = 2; | |
627 | ratetbl->rate[offset].count_rts = 2; | |
628 | ratetbl->rate[offset].count_cts = 2; | |
629 | } else { | |
630 | ratetbl->rate[offset].count = mr->retry_count; | |
631 | ratetbl->rate[offset].count_cts = mr->retry_count; | |
632 | ratetbl->rate[offset].count_rts = mr->retry_count_rtscts; | |
633 | } | |
a0497f9f FF |
634 | |
635 | if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { | |
a8566662 FF |
636 | idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
637 | flags = 0; | |
638 | } else { | |
7a5e3fa2 | 639 | idx = index % MCS_GROUP_RATES + (group->streams - 1) * 8; |
a8566662 FF |
640 | flags = IEEE80211_TX_RC_MCS | group->flags; |
641 | } | |
642 | ||
643 | if (offset > 0) { | |
644 | ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; | |
645 | flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
646 | } | |
647 | ||
648 | ratetbl->rate[offset].idx = idx; | |
649 | ratetbl->rate[offset].flags = flags; | |
650 | } | |
651 | ||
652 | static void | |
653 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
654 | { | |
655 | struct ieee80211_sta_rates *rates; | |
656 | int i = 0; | |
657 | ||
658 | rates = kzalloc(sizeof(*rates), GFP_ATOMIC); | |
659 | if (!rates) | |
a0497f9f | 660 | return; |
a8566662 FF |
661 | |
662 | /* Start with max_tp_rate */ | |
663 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate); | |
664 | ||
665 | if (mp->hw->max_rates >= 3) { | |
666 | /* At least 3 tx rates supported, use max_tp_rate2 next */ | |
667 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate2); | |
668 | } | |
669 | ||
670 | if (mp->hw->max_rates >= 2) { | |
671 | /* | |
672 | * At least 2 tx rates supported, use max_prob_rate next */ | |
673 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); | |
a0497f9f FF |
674 | } |
675 | ||
a8566662 FF |
676 | rates->rate[i].idx = -1; |
677 | rate_control_set_rates(mp->hw, mi->sta, rates); | |
ec8aa669 FF |
678 | } |
679 | ||
680 | static inline int | |
681 | minstrel_get_duration(int index) | |
682 | { | |
683 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; | |
684 | return group->duration[index % MCS_GROUP_RATES]; | |
685 | } | |
686 | ||
687 | static int | |
688 | minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) | |
689 | { | |
690 | struct minstrel_rate_stats *mr; | |
691 | struct minstrel_mcs_group_data *mg; | |
965237ab | 692 | unsigned int sample_dur, sample_group; |
ec8aa669 FF |
693 | int sample_idx = 0; |
694 | ||
695 | if (mi->sample_wait > 0) { | |
696 | mi->sample_wait--; | |
697 | return -1; | |
698 | } | |
699 | ||
700 | if (!mi->sample_tries) | |
701 | return -1; | |
702 | ||
ec8aa669 FF |
703 | mg = &mi->groups[mi->sample_group]; |
704 | sample_idx = sample_table[mg->column][mg->index]; | |
705 | mr = &mg->rates[sample_idx]; | |
965237ab FF |
706 | sample_group = mi->sample_group; |
707 | sample_idx += sample_group * MCS_GROUP_RATES; | |
8d5eab5a | 708 | minstrel_next_sample_idx(mi); |
ec8aa669 | 709 | |
ba6fa29c HS |
710 | /* |
711 | * Sampling might add some overhead (RTS, no aggregation) | |
712 | * to the frame. Hence, don't use sampling for the currently | |
a0ca796c | 713 | * used rates. |
ba6fa29c | 714 | */ |
a0ca796c FF |
715 | if (sample_idx == mi->max_tp_rate || |
716 | sample_idx == mi->max_tp_rate2 || | |
717 | sample_idx == mi->max_prob_rate) | |
ba6fa29c | 718 | return -1; |
a0ca796c | 719 | |
ec8aa669 | 720 | /* |
bc96f242 FF |
721 | * Do not sample if the probability is already higher than 95% |
722 | * to avoid wasting airtime. | |
ec8aa669 | 723 | */ |
bc96f242 | 724 | if (mr->probability > MINSTREL_FRAC(95, 100)) |
8d5eab5a | 725 | return -1; |
ec8aa669 FF |
726 | |
727 | /* | |
728 | * Make sure that lower rates get sampled only occasionally, | |
729 | * if the link is working perfectly. | |
730 | */ | |
965237ab FF |
731 | sample_dur = minstrel_get_duration(sample_idx); |
732 | if (sample_dur >= minstrel_get_duration(mi->max_tp_rate2) && | |
733 | (mi->max_prob_streams < | |
734 | minstrel_mcs_groups[sample_group].streams || | |
735 | sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { | |
c7317e41 | 736 | if (mr->sample_skipped < 20) |
8d5eab5a | 737 | return -1; |
ec8aa669 FF |
738 | |
739 | if (mi->sample_slow++ > 2) | |
8d5eab5a | 740 | return -1; |
ec8aa669 | 741 | } |
098b8afb | 742 | mi->sample_tries--; |
ec8aa669 FF |
743 | |
744 | return sample_idx; | |
ec8aa669 FF |
745 | } |
746 | ||
a0497f9f FF |
747 | static void |
748 | minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp, | |
749 | struct minstrel_ht_sta *mi, bool val) | |
750 | { | |
751 | u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported; | |
752 | ||
753 | if (!supported || !mi->cck_supported_short) | |
754 | return; | |
755 | ||
756 | if (supported & (mi->cck_supported_short << (val * 4))) | |
757 | return; | |
758 | ||
759 | supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4); | |
760 | mi->groups[MINSTREL_CCK_GROUP].supported = supported; | |
761 | } | |
762 | ||
ec8aa669 FF |
763 | static void |
764 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, | |
765 | struct ieee80211_tx_rate_control *txrc) | |
766 | { | |
a8566662 | 767 | const struct mcs_group *sample_group; |
ec8aa669 | 768 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
a8566662 | 769 | struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
ec8aa669 FF |
770 | struct minstrel_ht_sta_priv *msp = priv_sta; |
771 | struct minstrel_ht_sta *mi = &msp->ht; | |
772 | struct minstrel_priv *mp = priv; | |
773 | int sample_idx; | |
774 | ||
775 | if (rate_control_send_low(sta, priv_sta, txrc)) | |
776 | return; | |
777 | ||
778 | if (!msp->is_ht) | |
779 | return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); | |
780 | ||
781 | info->flags |= mi->tx_flags; | |
a0497f9f | 782 | minstrel_ht_check_cck_shortpreamble(mp, mi, txrc->short_preamble); |
6de062ce | 783 | |
37feb7e2 LB |
784 | #ifdef CONFIG_MAC80211_DEBUGFS |
785 | if (mp->fixed_rate_idx != -1) | |
786 | return; | |
787 | #endif | |
788 | ||
6de062ce HS |
789 | /* Don't use EAPOL frames for sampling on non-mrr hw */ |
790 | if (mp->hw->max_rates == 1 && | |
af61a165 | 791 | (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
6de062ce HS |
792 | sample_idx = -1; |
793 | else | |
794 | sample_idx = minstrel_get_sample_rate(mp, mi); | |
24f7580e | 795 | |
ec8aa669 FF |
796 | mi->total_packets++; |
797 | ||
798 | /* wraparound */ | |
799 | if (mi->total_packets == ~0) { | |
800 | mi->total_packets = 0; | |
801 | mi->sample_packets = 0; | |
802 | } | |
a8566662 FF |
803 | |
804 | if (sample_idx < 0) | |
805 | return; | |
806 | ||
807 | sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; | |
808 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
1cd15857 FF |
809 | rate->count = 1; |
810 | ||
811 | if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { | |
812 | int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); | |
813 | rate->idx = mp->cck_rates[idx]; | |
814 | rate->flags = 0; | |
815 | return; | |
816 | } | |
817 | ||
a8566662 | 818 | rate->idx = sample_idx % MCS_GROUP_RATES + |
7a5e3fa2 | 819 | (sample_group->streams - 1) * 8; |
a8566662 | 820 | rate->flags = IEEE80211_TX_RC_MCS | sample_group->flags; |
ec8aa669 FF |
821 | } |
822 | ||
a0497f9f FF |
823 | static void |
824 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, | |
825 | struct ieee80211_supported_band *sband, | |
826 | struct ieee80211_sta *sta) | |
827 | { | |
828 | int i; | |
829 | ||
830 | if (sband->band != IEEE80211_BAND_2GHZ) | |
831 | return; | |
832 | ||
2dfca312 FF |
833 | if (!(mp->hw->flags & IEEE80211_HW_SUPPORTS_HT_CCK_RATES)) |
834 | return; | |
835 | ||
a0497f9f FF |
836 | mi->cck_supported = 0; |
837 | mi->cck_supported_short = 0; | |
838 | for (i = 0; i < 4; i++) { | |
839 | if (!rate_supported(sta, sband->band, mp->cck_rates[i])) | |
840 | continue; | |
841 | ||
842 | mi->cck_supported |= BIT(i); | |
843 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
844 | mi->cck_supported_short |= BIT(i); | |
845 | } | |
846 | ||
847 | mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported; | |
848 | } | |
849 | ||
ec8aa669 FF |
850 | static void |
851 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 852 | struct cfg80211_chan_def *chandef, |
64f68e5d | 853 | struct ieee80211_sta *sta, void *priv_sta) |
ec8aa669 FF |
854 | { |
855 | struct minstrel_priv *mp = priv; | |
856 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
857 | struct minstrel_ht_sta *mi = &msp->ht; | |
858 | struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; | |
ec8aa669 | 859 | u16 sta_cap = sta->ht_cap.cap; |
4dc217df | 860 | int n_supported = 0; |
ec8aa669 FF |
861 | int ack_dur; |
862 | int stbc; | |
863 | int i; | |
864 | ||
865 | /* fall back to the old minstrel for legacy stations */ | |
4dc217df FF |
866 | if (!sta->ht_cap.ht_supported) |
867 | goto use_legacy; | |
ec8aa669 FF |
868 | |
869 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != | |
a0497f9f | 870 | MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS + 1); |
ec8aa669 FF |
871 | |
872 | msp->is_ht = true; | |
873 | memset(mi, 0, sizeof(*mi)); | |
a8566662 FF |
874 | |
875 | mi->sta = sta; | |
ec8aa669 FF |
876 | mi->stats_update = jiffies; |
877 | ||
438b61b7 SW |
878 | ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); |
879 | mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); | |
880 | mi->overhead += ack_dur; | |
ec8aa669 FF |
881 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
882 | ||
883 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); | |
884 | ||
885 | /* When using MRR, sample more on the first attempt, without delay */ | |
886 | if (mp->has_mrr) { | |
887 | mi->sample_count = 16; | |
888 | mi->sample_wait = 0; | |
889 | } else { | |
890 | mi->sample_count = 8; | |
891 | mi->sample_wait = 8; | |
892 | } | |
893 | mi->sample_tries = 4; | |
894 | ||
895 | stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >> | |
896 | IEEE80211_HT_CAP_RX_STBC_SHIFT; | |
897 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; | |
898 | ||
899 | if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) | |
900 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; | |
901 | ||
ec8aa669 | 902 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
ec8aa669 | 903 | mi->groups[i].supported = 0; |
a0497f9f FF |
904 | if (i == MINSTREL_CCK_GROUP) { |
905 | minstrel_ht_update_cck(mp, mi, sband, sta); | |
906 | continue; | |
907 | } | |
908 | ||
ec8aa669 | 909 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) { |
e1a0c6b3 JB |
910 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
911 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_40)) | |
912 | continue; | |
913 | } else { | |
914 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_20)) | |
915 | continue; | |
916 | } | |
ec8aa669 FF |
917 | } |
918 | ||
e1a0c6b3 JB |
919 | if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
920 | sta->bandwidth < IEEE80211_STA_RX_BW_40) | |
ec8aa669 FF |
921 | continue; |
922 | ||
e9219779 | 923 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
af0ed69b | 924 | if (sta->smps_mode == IEEE80211_SMPS_STATIC && |
e9219779 HS |
925 | minstrel_mcs_groups[i].streams > 1) |
926 | continue; | |
927 | ||
ec8aa669 FF |
928 | mi->groups[i].supported = |
929 | mcs->rx_mask[minstrel_mcs_groups[i].streams - 1]; | |
4dc217df FF |
930 | |
931 | if (mi->groups[i].supported) | |
932 | n_supported++; | |
ec8aa669 | 933 | } |
4dc217df FF |
934 | |
935 | if (!n_supported) | |
936 | goto use_legacy; | |
937 | ||
a8566662 | 938 | /* create an initial rate table with the lowest supported rates */ |
a3647362 | 939 | minstrel_ht_update_stats(mp, mi); |
a8566662 | 940 | minstrel_ht_update_rates(mp, mi); |
a3647362 | 941 | |
4dc217df FF |
942 | return; |
943 | ||
944 | use_legacy: | |
945 | msp->is_ht = false; | |
946 | memset(&msp->legacy, 0, sizeof(msp->legacy)); | |
947 | msp->legacy.r = msp->ratelist; | |
948 | msp->legacy.sample_table = msp->sample_table; | |
3de805cf SW |
949 | return mac80211_minstrel.rate_init(priv, sband, chandef, sta, |
950 | &msp->legacy); | |
ec8aa669 FF |
951 | } |
952 | ||
953 | static void | |
954 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 955 | struct cfg80211_chan_def *chandef, |
ec8aa669 FF |
956 | struct ieee80211_sta *sta, void *priv_sta) |
957 | { | |
3de805cf | 958 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
959 | } |
960 | ||
961 | static void | |
962 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, | |
3de805cf | 963 | struct cfg80211_chan_def *chandef, |
ec8aa669 | 964 | struct ieee80211_sta *sta, void *priv_sta, |
64f68e5d | 965 | u32 changed) |
ec8aa669 | 966 | { |
3de805cf | 967 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
ec8aa669 FF |
968 | } |
969 | ||
970 | static void * | |
971 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) | |
972 | { | |
973 | struct ieee80211_supported_band *sband; | |
974 | struct minstrel_ht_sta_priv *msp; | |
975 | struct minstrel_priv *mp = priv; | |
976 | struct ieee80211_hw *hw = mp->hw; | |
977 | int max_rates = 0; | |
978 | int i; | |
979 | ||
980 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
981 | sband = hw->wiphy->bands[i]; | |
982 | if (sband && sband->n_bitrates > max_rates) | |
983 | max_rates = sband->n_bitrates; | |
984 | } | |
985 | ||
472dd35c | 986 | msp = kzalloc(sizeof(*msp), gfp); |
ec8aa669 FF |
987 | if (!msp) |
988 | return NULL; | |
989 | ||
990 | msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); | |
991 | if (!msp->ratelist) | |
992 | goto error; | |
993 | ||
994 | msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp); | |
995 | if (!msp->sample_table) | |
996 | goto error1; | |
997 | ||
998 | return msp; | |
999 | ||
1000 | error1: | |
7e988014 | 1001 | kfree(msp->ratelist); |
ec8aa669 FF |
1002 | error: |
1003 | kfree(msp); | |
1004 | return NULL; | |
1005 | } | |
1006 | ||
1007 | static void | |
1008 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) | |
1009 | { | |
1010 | struct minstrel_ht_sta_priv *msp = priv_sta; | |
1011 | ||
1012 | kfree(msp->sample_table); | |
1013 | kfree(msp->ratelist); | |
1014 | kfree(msp); | |
1015 | } | |
1016 | ||
1017 | static void * | |
1018 | minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
1019 | { | |
1020 | return mac80211_minstrel.alloc(hw, debugfsdir); | |
1021 | } | |
1022 | ||
1023 | static void | |
1024 | minstrel_ht_free(void *priv) | |
1025 | { | |
1026 | mac80211_minstrel.free(priv); | |
1027 | } | |
1028 | ||
1029 | static struct rate_control_ops mac80211_minstrel_ht = { | |
1030 | .name = "minstrel_ht", | |
1031 | .tx_status = minstrel_ht_tx_status, | |
1032 | .get_rate = minstrel_ht_get_rate, | |
1033 | .rate_init = minstrel_ht_rate_init, | |
1034 | .rate_update = minstrel_ht_rate_update, | |
1035 | .alloc_sta = minstrel_ht_alloc_sta, | |
1036 | .free_sta = minstrel_ht_free_sta, | |
1037 | .alloc = minstrel_ht_alloc, | |
1038 | .free = minstrel_ht_free, | |
1039 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1040 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, | |
1041 | .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs, | |
1042 | #endif | |
1043 | }; | |
1044 | ||
1045 | ||
1046 | static void | |
1047 | init_sample_table(void) | |
1048 | { | |
1049 | int col, i, new_idx; | |
1050 | u8 rnd[MCS_GROUP_RATES]; | |
1051 | ||
1052 | memset(sample_table, 0xff, sizeof(sample_table)); | |
1053 | for (col = 0; col < SAMPLE_COLUMNS; col++) { | |
f7d8ad81 | 1054 | prandom_bytes(rnd, sizeof(rnd)); |
ec8aa669 | 1055 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
ec8aa669 | 1056 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
ec8aa669 FF |
1057 | while (sample_table[col][new_idx] != 0xff) |
1058 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; | |
1059 | ||
1060 | sample_table[col][new_idx] = i; | |
1061 | } | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | int __init | |
1066 | rc80211_minstrel_ht_init(void) | |
1067 | { | |
1068 | init_sample_table(); | |
1069 | return ieee80211_rate_control_register(&mac80211_minstrel_ht); | |
1070 | } | |
1071 | ||
1072 | void | |
1073 | rc80211_minstrel_ht_exit(void) | |
1074 | { | |
1075 | ieee80211_rate_control_unregister(&mac80211_minstrel_ht); | |
1076 | } |