1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org> |
4 | * Copyright (C) 2019-2022 Intel Corporation |
5 | */ |
6 | #include <linux/netdevice.h> |
7 | #include <linux/types.h> |
8 | #include <linux/skbuff.h> |
9 | #include <linux/debugfs.h> |
10 | #include <linux/random.h> |
11 | #include <linux/moduleparam.h> |
12 | #include <linux/ieee80211.h> |
13 | #include <linux/minmax.h> |
14 | #include <net/mac80211.h> |
15 | #include "rate.h" |
16 | #include "sta_info.h" |
17 | #include "rc80211_minstrel_ht.h" |
18 | |
19 | #define AVG_AMPDU_SIZE 16 |
20 | #define AVG_PKT_SIZE 1200 |
21 | |
22 | /* Number of bits for an average sized packet */ |
23 | #define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3) |
24 | |
25 | /* Number of symbols for a packet with (bps) bits per symbol */ |
26 | #define MCS_NSYMS(bps) DIV_ROUND_UP(MCS_NBITS, (bps)) |
27 | |
28 | /* Transmission time (nanoseconds) for a packet containing (syms) symbols */ |
29 | #define MCS_SYMBOL_TIME(sgi, syms) \ |
30 | (sgi ? \ |
31 | ((syms) * 18000 + 4000) / 5 : /* syms * 3.6 us */ \ |
32 | ((syms) * 1000) << 2 /* syms * 4 us */ \ |
33 | ) |
34 | |
35 | /* Transmit duration for the raw data part of an average sized packet */ |
36 | #define MCS_DURATION(streams, sgi, bps) \ |
37 | (MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) / AVG_AMPDU_SIZE) |
38 | |
39 | #define BW_20 0 |
40 | #define BW_40 1 |
41 | #define BW_80 2 |
42 | |
43 | /* |
44 | * Define group sort order: HT40 -> SGI -> #streams |
45 | */ |
46 | #define GROUP_IDX(_streams, _sgi, _ht40) \ |
47 | MINSTREL_HT_GROUP_0 + \ |
48 | MINSTREL_MAX_STREAMS * 2 * _ht40 + \ |
49 | MINSTREL_MAX_STREAMS * _sgi + \ |
50 | _streams - 1 |
51 | |
52 | #define _MAX(a, b) (((a)>(b))?(a):(b)) |
53 | |
54 | #define GROUP_SHIFT(duration) \ |
55 | _MAX(0, 16 - __builtin_clz(duration)) |
56 | |
57 | /* MCS rate information for an MCS group */ |
58 | #define __MCS_GROUP(_streams, _sgi, _ht40, _s) \ |
59 | [GROUP_IDX(_streams, _sgi, _ht40)] = { \ |
60 | .streams = _streams, \ |
61 | .shift = _s, \ |
62 | .bw = _ht40, \ |
63 | .flags = \ |
64 | IEEE80211_TX_RC_MCS | \ |
65 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
66 | (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ |
67 | .duration = { \ |
68 | MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26) >> _s, \ |
69 | MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52) >> _s, \ |
70 | MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78) >> _s, \ |
71 | MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104) >> _s, \ |
72 | MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156) >> _s, \ |
73 | MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208) >> _s, \ |
74 | MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234) >> _s, \ |
75 | MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) >> _s \ |
76 | } \ |
77 | } |
78 | |
79 | #define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \ |
80 | GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26)) |
81 | |
82 | #define MCS_GROUP(_streams, _sgi, _ht40) \ |
83 | __MCS_GROUP(_streams, _sgi, _ht40, \ |
84 | MCS_GROUP_SHIFT(_streams, _sgi, _ht40)) |
85 | |
86 | #define VHT_GROUP_IDX(_streams, _sgi, _bw) \ |
87 | (MINSTREL_VHT_GROUP_0 + \ |
88 | MINSTREL_MAX_STREAMS * 2 * (_bw) + \ |
89 | MINSTREL_MAX_STREAMS * (_sgi) + \ |
90 | (_streams) - 1) |
91 | |
92 | #define BW2VBPS(_bw, r3, r2, r1) \ |
93 | (_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1) |
94 | |
95 | #define __VHT_GROUP(_streams, _sgi, _bw, _s) \ |
96 | [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \ |
97 | .streams = _streams, \ |
98 | .shift = _s, \ |
99 | .bw = _bw, \ |
100 | .flags = \ |
101 | IEEE80211_TX_RC_VHT_MCS | \ |
102 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
103 | (_bw == BW_80 ? IEEE80211_TX_RC_80_MHZ_WIDTH : \ |
104 | _bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ |
105 | .duration = { \ |
106 | MCS_DURATION(_streams, _sgi, \ |
107 | BW2VBPS(_bw, 117, 54, 26)) >> _s, \ |
108 | MCS_DURATION(_streams, _sgi, \ |
109 | BW2VBPS(_bw, 234, 108, 52)) >> _s, \ |
110 | MCS_DURATION(_streams, _sgi, \ |
111 | BW2VBPS(_bw, 351, 162, 78)) >> _s, \ |
112 | MCS_DURATION(_streams, _sgi, \ |
113 | BW2VBPS(_bw, 468, 216, 104)) >> _s, \ |
114 | MCS_DURATION(_streams, _sgi, \ |
115 | BW2VBPS(_bw, 702, 324, 156)) >> _s, \ |
116 | MCS_DURATION(_streams, _sgi, \ |
117 | BW2VBPS(_bw, 936, 432, 208)) >> _s, \ |
118 | MCS_DURATION(_streams, _sgi, \ |
119 | BW2VBPS(_bw, 1053, 486, 234)) >> _s, \ |
120 | MCS_DURATION(_streams, _sgi, \ |
121 | BW2VBPS(_bw, 1170, 540, 260)) >> _s, \ |
122 | MCS_DURATION(_streams, _sgi, \ |
123 | BW2VBPS(_bw, 1404, 648, 312)) >> _s, \ |
124 | MCS_DURATION(_streams, _sgi, \ |
125 | BW2VBPS(_bw, 1560, 720, 346)) >> _s \ |
126 | } \ |
127 | } |
128 | |
129 | #define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \ |
130 | GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \ |
131 | BW2VBPS(_bw, 117, 54, 26))) |
132 | |
133 | #define VHT_GROUP(_streams, _sgi, _bw) \ |
134 | __VHT_GROUP(_streams, _sgi, _bw, \ |
135 | VHT_GROUP_SHIFT(_streams, _sgi, _bw)) |
136 | |
137 | #define CCK_DURATION(_bitrate, _short) \ |
138 | (1000 * (10 /* SIFS */ + \ |
139 | (_short ? 72 + 24 : 144 + 48) + \ |
140 | (8 * (AVG_PKT_SIZE + 4) * 10) / (_bitrate))) |
141 | |
142 | #define CCK_DURATION_LIST(_short, _s) \ |
143 | CCK_DURATION(10, _short) >> _s, \ |
144 | CCK_DURATION(20, _short) >> _s, \ |
145 | CCK_DURATION(55, _short) >> _s, \ |
146 | CCK_DURATION(110, _short) >> _s |
147 | |
148 | #define __CCK_GROUP(_s) \ |
149 | [MINSTREL_CCK_GROUP] = { \ |
150 | .streams = 1, \ |
151 | .flags = 0, \ |
152 | .shift = _s, \ |
153 | .duration = { \ |
154 | CCK_DURATION_LIST(false, _s), \ |
155 | CCK_DURATION_LIST(true, _s) \ |
156 | } \ |
157 | } |
158 | |
159 | #define CCK_GROUP_SHIFT \ |
160 | GROUP_SHIFT(CCK_DURATION(10, false)) |
161 | |
162 | #define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT) |
163 | |
164 | #define OFDM_DURATION(_bitrate) \ |
165 | (1000 * (16 /* SIFS + signal ext */ + \ |
166 | 16 /* T_PREAMBLE */ + \ |
167 | 4 /* T_SIGNAL */ + \ |
168 | 4 * (((16 + 80 * (AVG_PKT_SIZE + 4) + 6) / \ |
169 | ((_bitrate) * 4))))) |
170 | |
171 | #define OFDM_DURATION_LIST(_s) \ |
172 | OFDM_DURATION(60) >> _s, \ |
173 | OFDM_DURATION(90) >> _s, \ |
174 | OFDM_DURATION(120) >> _s, \ |
175 | OFDM_DURATION(180) >> _s, \ |
176 | OFDM_DURATION(240) >> _s, \ |
177 | OFDM_DURATION(360) >> _s, \ |
178 | OFDM_DURATION(480) >> _s, \ |
179 | OFDM_DURATION(540) >> _s |
180 | |
181 | #define __OFDM_GROUP(_s) \ |
182 | [MINSTREL_OFDM_GROUP] = { \ |
183 | .streams = 1, \ |
184 | .flags = 0, \ |
185 | .shift = _s, \ |
186 | .duration = { \ |
187 | OFDM_DURATION_LIST(_s), \ |
188 | } \ |
189 | } |
190 | |
191 | #define OFDM_GROUP_SHIFT \ |
192 | GROUP_SHIFT(OFDM_DURATION(60)) |
193 | |
194 | #define OFDM_GROUP __OFDM_GROUP(OFDM_GROUP_SHIFT) |
195 | |
196 | |
197 | static bool minstrel_vht_only = true; |
198 | module_param(minstrel_vht_only, bool, 0644); |
199 | MODULE_PARM_DESC(minstrel_vht_only, |
200 | "Use only VHT rates when VHT is supported by sta." ); |
201 | |
202 | /* |
203 | * To enable sufficiently targeted rate sampling, MCS rates are divided into |
204 | * groups, based on the number of streams and flags (HT40, SGI) that they |
205 | * use. |
206 | * |
207 | * Sortorder has to be fixed for GROUP_IDX macro to be applicable: |
208 | * BW -> SGI -> #streams |
209 | */ |
210 | const struct mcs_group minstrel_mcs_groups[] = { |
211 | MCS_GROUP(1, 0, BW_20), |
212 | MCS_GROUP(2, 0, BW_20), |
213 | MCS_GROUP(3, 0, BW_20), |
214 | MCS_GROUP(4, 0, BW_20), |
215 | |
216 | MCS_GROUP(1, 1, BW_20), |
217 | MCS_GROUP(2, 1, BW_20), |
218 | MCS_GROUP(3, 1, BW_20), |
219 | MCS_GROUP(4, 1, BW_20), |
220 | |
221 | MCS_GROUP(1, 0, BW_40), |
222 | MCS_GROUP(2, 0, BW_40), |
223 | MCS_GROUP(3, 0, BW_40), |
224 | MCS_GROUP(4, 0, BW_40), |
225 | |
226 | MCS_GROUP(1, 1, BW_40), |
227 | MCS_GROUP(2, 1, BW_40), |
228 | MCS_GROUP(3, 1, BW_40), |
229 | MCS_GROUP(4, 1, BW_40), |
230 | |
231 | CCK_GROUP, |
232 | OFDM_GROUP, |
233 | |
234 | VHT_GROUP(1, 0, BW_20), |
235 | VHT_GROUP(2, 0, BW_20), |
236 | VHT_GROUP(3, 0, BW_20), |
237 | VHT_GROUP(4, 0, BW_20), |
238 | |
239 | VHT_GROUP(1, 1, BW_20), |
240 | VHT_GROUP(2, 1, BW_20), |
241 | VHT_GROUP(3, 1, BW_20), |
242 | VHT_GROUP(4, 1, BW_20), |
243 | |
244 | VHT_GROUP(1, 0, BW_40), |
245 | VHT_GROUP(2, 0, BW_40), |
246 | VHT_GROUP(3, 0, BW_40), |
247 | VHT_GROUP(4, 0, BW_40), |
248 | |
249 | VHT_GROUP(1, 1, BW_40), |
250 | VHT_GROUP(2, 1, BW_40), |
251 | VHT_GROUP(3, 1, BW_40), |
252 | VHT_GROUP(4, 1, BW_40), |
253 | |
254 | VHT_GROUP(1, 0, BW_80), |
255 | VHT_GROUP(2, 0, BW_80), |
256 | VHT_GROUP(3, 0, BW_80), |
257 | VHT_GROUP(4, 0, BW_80), |
258 | |
259 | VHT_GROUP(1, 1, BW_80), |
260 | VHT_GROUP(2, 1, BW_80), |
261 | VHT_GROUP(3, 1, BW_80), |
262 | VHT_GROUP(4, 1, BW_80), |
263 | }; |
264 | |
265 | const s16 minstrel_cck_bitrates[4] = { 10, 20, 55, 110 }; |
266 | const s16 minstrel_ofdm_bitrates[8] = { 60, 90, 120, 180, 240, 360, 480, 540 }; |
267 | static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly; |
268 | static const u8 minstrel_sample_seq[] = { |
269 | MINSTREL_SAMPLE_TYPE_INC, |
270 | MINSTREL_SAMPLE_TYPE_JUMP, |
271 | MINSTREL_SAMPLE_TYPE_INC, |
272 | MINSTREL_SAMPLE_TYPE_JUMP, |
273 | MINSTREL_SAMPLE_TYPE_INC, |
274 | MINSTREL_SAMPLE_TYPE_SLOW, |
275 | }; |
276 | |
277 | static void |
278 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi); |
279 | |
280 | /* |
281 | * Some VHT MCSes are invalid (when Ndbps / Nes is not an integer) |
282 | * e.g for MCS9@20MHzx1Nss: Ndbps=8x52*(5/6) Nes=1 |
283 | * |
284 | * Returns the valid mcs map for struct minstrel_mcs_group_data.supported |
285 | */ |
286 | static u16 |
287 | minstrel_get_valid_vht_rates(int bw, int nss, __le16 mcs_map) |
288 | { |
289 | u16 mask = 0; |
290 | |
291 | if (bw == BW_20) { |
292 | if (nss != 3 && nss != 6) |
293 | mask = BIT(9); |
294 | } else if (bw == BW_80) { |
295 | if (nss == 3 || nss == 7) |
296 | mask = BIT(6); |
297 | else if (nss == 6) |
298 | mask = BIT(9); |
299 | } else { |
300 | WARN_ON(bw != BW_40); |
301 | } |
302 | |
303 | switch ((le16_to_cpu(mcs_map) >> (2 * (nss - 1))) & 3) { |
304 | case IEEE80211_VHT_MCS_SUPPORT_0_7: |
305 | mask |= 0x300; |
306 | break; |
307 | case IEEE80211_VHT_MCS_SUPPORT_0_8: |
308 | mask |= 0x200; |
309 | break; |
310 | case IEEE80211_VHT_MCS_SUPPORT_0_9: |
311 | break; |
312 | default: |
313 | mask = 0x3ff; |
314 | } |
315 | |
316 | return 0x3ff & ~mask; |
317 | } |
318 | |
319 | static bool |
320 | minstrel_ht_is_legacy_group(int group) |
321 | { |
322 | return group == MINSTREL_CCK_GROUP || |
323 | group == MINSTREL_OFDM_GROUP; |
324 | } |
325 | |
326 | /* |
327 | * Look up an MCS group index based on mac80211 rate information |
328 | */ |
329 | static int |
330 | minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) |
331 | { |
332 | return GROUP_IDX((rate->idx / 8) + 1, |
333 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
334 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); |
335 | } |
336 | |
337 | /* |
338 | * Look up an MCS group index based on new cfg80211 rate_info. |
339 | */ |
340 | static int |
341 | minstrel_ht_ri_get_group_idx(struct rate_info *rate) |
342 | { |
343 | return GROUP_IDX((rate->mcs / 8) + 1, |
344 | !!(rate->flags & RATE_INFO_FLAGS_SHORT_GI), |
345 | !!(rate->bw & RATE_INFO_BW_40)); |
346 | } |
347 | |
348 | static int |
349 | minstrel_vht_get_group_idx(struct ieee80211_tx_rate *rate) |
350 | { |
351 | return VHT_GROUP_IDX(ieee80211_rate_get_vht_nss(rate), |
352 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
353 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) + |
354 | 2*!!(rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)); |
355 | } |
356 | |
357 | /* |
358 | * Look up an MCS group index based on new cfg80211 rate_info. |
359 | */ |
360 | static int |
361 | minstrel_vht_ri_get_group_idx(struct rate_info *rate) |
362 | { |
363 | return VHT_GROUP_IDX(rate->nss, |
364 | !!(rate->flags & RATE_INFO_FLAGS_SHORT_GI), |
365 | !!(rate->bw & RATE_INFO_BW_40) + |
366 | 2*!!(rate->bw & RATE_INFO_BW_80)); |
367 | } |
368 | |
369 | static struct minstrel_rate_stats * |
370 | minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
371 | struct ieee80211_tx_rate *rate) |
372 | { |
373 | int group, idx; |
374 | |
375 | if (rate->flags & IEEE80211_TX_RC_MCS) { |
376 | group = minstrel_ht_get_group_idx(rate); |
377 | idx = rate->idx % 8; |
378 | goto out; |
379 | } |
380 | |
381 | if (rate->flags & IEEE80211_TX_RC_VHT_MCS) { |
382 | group = minstrel_vht_get_group_idx(rate); |
383 | idx = ieee80211_rate_get_vht_mcs(rate); |
384 | goto out; |
385 | } |
386 | |
387 | group = MINSTREL_CCK_GROUP; |
388 | for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) { |
389 | if (!(mi->supported[group] & BIT(idx))) |
390 | continue; |
391 | |
392 | if (rate->idx != mp->cck_rates[idx]) |
393 | continue; |
394 | |
395 | /* short preamble */ |
396 | if ((mi->supported[group] & BIT(idx + 4)) && |
397 | (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)) |
398 | idx += 4; |
399 | goto out; |
400 | } |
401 | |
402 | group = MINSTREL_OFDM_GROUP; |
403 | for (idx = 0; idx < ARRAY_SIZE(mp->ofdm_rates[0]); idx++) |
404 | if (rate->idx == mp->ofdm_rates[mi->band][idx]) |
405 | goto out; |
406 | |
407 | idx = 0; |
408 | out: |
409 | return &mi->groups[group].rates[idx]; |
410 | } |
411 | |
412 | /* |
413 | * Get the minstrel rate statistics for specified STA and rate info. |
414 | */ |
415 | static struct minstrel_rate_stats * |
416 | minstrel_ht_ri_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
417 | struct ieee80211_rate_status *rate_status) |
418 | { |
419 | int group, idx; |
420 | struct rate_info *rate = &rate_status->rate_idx; |
421 | |
422 | if (rate->flags & RATE_INFO_FLAGS_MCS) { |
423 | group = minstrel_ht_ri_get_group_idx(rate); |
424 | idx = rate->mcs % 8; |
425 | goto out; |
426 | } |
427 | |
428 | if (rate->flags & RATE_INFO_FLAGS_VHT_MCS) { |
429 | group = minstrel_vht_ri_get_group_idx(rate); |
430 | idx = rate->mcs; |
431 | goto out; |
432 | } |
433 | |
434 | group = MINSTREL_CCK_GROUP; |
435 | for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) { |
436 | if (rate->legacy != minstrel_cck_bitrates[ mp->cck_rates[idx] ]) |
437 | continue; |
438 | |
439 | /* short preamble */ |
440 | if ((mi->supported[group] & BIT(idx + 4)) && |
441 | mi->use_short_preamble) |
442 | idx += 4; |
443 | goto out; |
444 | } |
445 | |
446 | group = MINSTREL_OFDM_GROUP; |
447 | for (idx = 0; idx < ARRAY_SIZE(mp->ofdm_rates[0]); idx++) |
448 | if (rate->legacy == minstrel_ofdm_bitrates[ mp->ofdm_rates[mi->band][idx] ]) |
449 | goto out; |
450 | |
451 | idx = 0; |
452 | out: |
453 | return &mi->groups[group].rates[idx]; |
454 | } |
455 | |
456 | static inline struct minstrel_rate_stats * |
457 | minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) |
458 | { |
459 | return &mi->groups[MI_RATE_GROUP(index)].rates[MI_RATE_IDX(index)]; |
460 | } |
461 | |
462 | static inline int minstrel_get_duration(int index) |
463 | { |
464 | const struct mcs_group *group = &minstrel_mcs_groups[MI_RATE_GROUP(index)]; |
465 | unsigned int duration = group->duration[MI_RATE_IDX(index)]; |
466 | |
467 | return duration << group->shift; |
468 | } |
469 | |
470 | static unsigned int |
471 | minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi) |
472 | { |
473 | int duration; |
474 | |
475 | if (mi->avg_ampdu_len) |
476 | return MINSTREL_TRUNC(mi->avg_ampdu_len); |
477 | |
478 | if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(mi->max_tp_rate[0]))) |
479 | return 1; |
480 | |
481 | duration = minstrel_get_duration(index: mi->max_tp_rate[0]); |
482 | |
483 | if (duration > 400 * 1000) |
484 | return 2; |
485 | |
486 | if (duration > 250 * 1000) |
487 | return 4; |
488 | |
489 | if (duration > 150 * 1000) |
490 | return 8; |
491 | |
492 | return 16; |
493 | } |
494 | |
495 | /* |
496 | * Return current throughput based on the average A-MPDU length, taking into |
497 | * account the expected number of retransmissions and their expected length |
498 | */ |
499 | int |
500 | minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate, |
501 | int prob_avg) |
502 | { |
503 | unsigned int nsecs = 0, overhead = mi->overhead; |
504 | unsigned int ampdu_len = 1; |
505 | |
506 | /* do not account throughput if success prob is below 10% */ |
507 | if (prob_avg < MINSTREL_FRAC(10, 100)) |
508 | return 0; |
509 | |
510 | if (minstrel_ht_is_legacy_group(group)) |
511 | overhead = mi->overhead_legacy; |
512 | else |
513 | ampdu_len = minstrel_ht_avg_ampdu_len(mi); |
514 | |
515 | nsecs = 1000 * overhead / ampdu_len; |
516 | nsecs += minstrel_mcs_groups[group].duration[rate] << |
517 | minstrel_mcs_groups[group].shift; |
518 | |
519 | /* |
520 | * For the throughput calculation, limit the probability value to 90% to |
521 | * account for collision related packet error rate fluctuation |
522 | * (prob is scaled - see MINSTREL_FRAC above) |
523 | */ |
524 | if (prob_avg > MINSTREL_FRAC(90, 100)) |
525 | prob_avg = MINSTREL_FRAC(90, 100); |
526 | |
527 | return MINSTREL_TRUNC(100 * ((prob_avg * 1000000) / nsecs)); |
528 | } |
529 | |
530 | /* |
531 | * Find & sort topmost throughput rates |
532 | * |
533 | * If multiple rates provide equal throughput the sorting is based on their |
534 | * current success probability. Higher success probability is preferred among |
535 | * MCS groups, CCK rates do not provide aggregation and are therefore at last. |
536 | */ |
537 | static void |
538 | minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index, |
539 | u16 *tp_list) |
540 | { |
541 | int cur_group, cur_idx, cur_tp_avg, cur_prob; |
542 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
543 | int j = MAX_THR_RATES; |
544 | |
545 | cur_group = MI_RATE_GROUP(index); |
546 | cur_idx = MI_RATE_IDX(index); |
547 | cur_prob = mi->groups[cur_group].rates[cur_idx].prob_avg; |
548 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, group: cur_group, rate: cur_idx, prob_avg: cur_prob); |
549 | |
550 | do { |
551 | tmp_group = MI_RATE_GROUP(tp_list[j - 1]); |
552 | tmp_idx = MI_RATE_IDX(tp_list[j - 1]); |
553 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg; |
554 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, group: tmp_group, rate: tmp_idx, |
555 | prob_avg: tmp_prob); |
556 | if (cur_tp_avg < tmp_tp_avg || |
557 | (cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob)) |
558 | break; |
559 | j--; |
560 | } while (j > 0); |
561 | |
562 | if (j < MAX_THR_RATES - 1) { |
563 | memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) * |
564 | (MAX_THR_RATES - (j + 1)))); |
565 | } |
566 | if (j < MAX_THR_RATES) |
567 | tp_list[j] = index; |
568 | } |
569 | |
570 | /* |
571 | * Find and set the topmost probability rate per sta and per group |
572 | */ |
573 | static void |
574 | minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 *dest, u16 index) |
575 | { |
576 | struct minstrel_mcs_group_data *mg; |
577 | struct minstrel_rate_stats *mrs; |
578 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
579 | int max_tp_group, max_tp_idx, max_tp_prob; |
580 | int cur_tp_avg, cur_group, cur_idx; |
581 | int max_gpr_group, max_gpr_idx; |
582 | int max_gpr_tp_avg, max_gpr_prob; |
583 | |
584 | cur_group = MI_RATE_GROUP(index); |
585 | cur_idx = MI_RATE_IDX(index); |
586 | mg = &mi->groups[cur_group]; |
587 | mrs = &mg->rates[cur_idx]; |
588 | |
589 | tmp_group = MI_RATE_GROUP(*dest); |
590 | tmp_idx = MI_RATE_IDX(*dest); |
591 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg; |
592 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, group: tmp_group, rate: tmp_idx, prob_avg: tmp_prob); |
593 | |
594 | /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from |
595 | * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */ |
596 | max_tp_group = MI_RATE_GROUP(mi->max_tp_rate[0]); |
597 | max_tp_idx = MI_RATE_IDX(mi->max_tp_rate[0]); |
598 | max_tp_prob = mi->groups[max_tp_group].rates[max_tp_idx].prob_avg; |
599 | |
600 | if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(index)) && |
601 | !minstrel_ht_is_legacy_group(group: max_tp_group)) |
602 | return; |
603 | |
604 | /* skip rates faster than max tp rate with lower prob */ |
605 | if (minstrel_get_duration(index: mi->max_tp_rate[0]) > minstrel_get_duration(index) && |
606 | mrs->prob_avg < max_tp_prob) |
607 | return; |
608 | |
609 | max_gpr_group = MI_RATE_GROUP(mg->max_group_prob_rate); |
610 | max_gpr_idx = MI_RATE_IDX(mg->max_group_prob_rate); |
611 | max_gpr_prob = mi->groups[max_gpr_group].rates[max_gpr_idx].prob_avg; |
612 | |
613 | if (mrs->prob_avg > MINSTREL_FRAC(75, 100)) { |
614 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, group: cur_group, rate: cur_idx, |
615 | prob_avg: mrs->prob_avg); |
616 | if (cur_tp_avg > tmp_tp_avg) |
617 | *dest = index; |
618 | |
619 | max_gpr_tp_avg = minstrel_ht_get_tp_avg(mi, group: max_gpr_group, |
620 | rate: max_gpr_idx, |
621 | prob_avg: max_gpr_prob); |
622 | if (cur_tp_avg > max_gpr_tp_avg) |
623 | mg->max_group_prob_rate = index; |
624 | } else { |
625 | if (mrs->prob_avg > tmp_prob) |
626 | *dest = index; |
627 | if (mrs->prob_avg > max_gpr_prob) |
628 | mg->max_group_prob_rate = index; |
629 | } |
630 | } |
631 | |
632 | |
633 | /* |
634 | * Assign new rate set per sta and use CCK rates only if the fastest |
635 | * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted |
636 | * rate sets where MCS and CCK rates are mixed, because CCK rates can |
637 | * not use aggregation. |
638 | */ |
639 | static void |
640 | minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi, |
641 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], |
642 | u16 tmp_legacy_tp_rate[MAX_THR_RATES]) |
643 | { |
644 | unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob; |
645 | int i; |
646 | |
647 | tmp_group = MI_RATE_GROUP(tmp_legacy_tp_rate[0]); |
648 | tmp_idx = MI_RATE_IDX(tmp_legacy_tp_rate[0]); |
649 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg; |
650 | tmp_cck_tp = minstrel_ht_get_tp_avg(mi, group: tmp_group, rate: tmp_idx, prob_avg: tmp_prob); |
651 | |
652 | tmp_group = MI_RATE_GROUP(tmp_mcs_tp_rate[0]); |
653 | tmp_idx = MI_RATE_IDX(tmp_mcs_tp_rate[0]); |
654 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg; |
655 | tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, group: tmp_group, rate: tmp_idx, prob_avg: tmp_prob); |
656 | |
657 | if (tmp_cck_tp > tmp_mcs_tp) { |
658 | for(i = 0; i < MAX_THR_RATES; i++) { |
659 | minstrel_ht_sort_best_tp_rates(mi, index: tmp_legacy_tp_rate[i], |
660 | tp_list: tmp_mcs_tp_rate); |
661 | } |
662 | } |
663 | |
664 | } |
665 | |
666 | /* |
667 | * Try to increase robustness of max_prob rate by decrease number of |
668 | * streams if possible. |
669 | */ |
670 | static inline void |
671 | minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi) |
672 | { |
673 | struct minstrel_mcs_group_data *mg; |
674 | int tmp_max_streams, group, tmp_idx, tmp_prob; |
675 | int tmp_tp = 0; |
676 | |
677 | if (!mi->sta->deflink.ht_cap.ht_supported) |
678 | return; |
679 | |
680 | group = MI_RATE_GROUP(mi->max_tp_rate[0]); |
681 | tmp_max_streams = minstrel_mcs_groups[group].streams; |
682 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
683 | mg = &mi->groups[group]; |
684 | if (!mi->supported[group] || group == MINSTREL_CCK_GROUP) |
685 | continue; |
686 | |
687 | tmp_idx = MI_RATE_IDX(mg->max_group_prob_rate); |
688 | tmp_prob = mi->groups[group].rates[tmp_idx].prob_avg; |
689 | |
690 | if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, rate: tmp_idx, prob_avg: tmp_prob) && |
691 | (minstrel_mcs_groups[group].streams < tmp_max_streams)) { |
692 | mi->max_prob_rate = mg->max_group_prob_rate; |
693 | tmp_tp = minstrel_ht_get_tp_avg(mi, group, |
694 | rate: tmp_idx, |
695 | prob_avg: tmp_prob); |
696 | } |
697 | } |
698 | } |
699 | |
700 | static u16 |
701 | __minstrel_ht_get_sample_rate(struct minstrel_ht_sta *mi, |
702 | enum minstrel_sample_type type) |
703 | { |
704 | u16 *rates = mi->sample[type].sample_rates; |
705 | u16 cur; |
706 | int i; |
707 | |
708 | for (i = 0; i < MINSTREL_SAMPLE_RATES; i++) { |
709 | if (!rates[i]) |
710 | continue; |
711 | |
712 | cur = rates[i]; |
713 | rates[i] = 0; |
714 | return cur; |
715 | } |
716 | |
717 | return 0; |
718 | } |
719 | |
720 | static inline int |
721 | minstrel_ewma(int old, int new, int weight) |
722 | { |
723 | int diff, incr; |
724 | |
725 | diff = new - old; |
726 | incr = (EWMA_DIV - weight) * diff / EWMA_DIV; |
727 | |
728 | return old + incr; |
729 | } |
730 | |
731 | static inline int minstrel_filter_avg_add(u16 *prev_1, u16 *prev_2, s32 in) |
732 | { |
733 | s32 out_1 = *prev_1; |
734 | s32 out_2 = *prev_2; |
735 | s32 val; |
736 | |
737 | if (!in) |
738 | in += 1; |
739 | |
740 | if (!out_1) { |
741 | val = out_1 = in; |
742 | goto out; |
743 | } |
744 | |
745 | val = MINSTREL_AVG_COEFF1 * in; |
746 | val += MINSTREL_AVG_COEFF2 * out_1; |
747 | val += MINSTREL_AVG_COEFF3 * out_2; |
748 | val >>= MINSTREL_SCALE; |
749 | |
750 | if (val > 1 << MINSTREL_SCALE) |
751 | val = 1 << MINSTREL_SCALE; |
752 | if (val < 0) |
753 | val = 1; |
754 | |
755 | out: |
756 | *prev_2 = out_1; |
757 | *prev_1 = val; |
758 | |
759 | return val; |
760 | } |
761 | |
762 | /* |
763 | * Recalculate statistics and counters of a given rate |
764 | */ |
765 | static void |
766 | minstrel_ht_calc_rate_stats(struct minstrel_priv *mp, |
767 | struct minstrel_rate_stats *mrs) |
768 | { |
769 | unsigned int cur_prob; |
770 | |
771 | if (unlikely(mrs->attempts > 0)) { |
772 | cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts); |
773 | minstrel_filter_avg_add(prev_1: &mrs->prob_avg, |
774 | prev_2: &mrs->prob_avg_1, in: cur_prob); |
775 | mrs->att_hist += mrs->attempts; |
776 | mrs->succ_hist += mrs->success; |
777 | } |
778 | |
779 | mrs->last_success = mrs->success; |
780 | mrs->last_attempts = mrs->attempts; |
781 | mrs->success = 0; |
782 | mrs->attempts = 0; |
783 | } |
784 | |
785 | static bool |
786 | minstrel_ht_find_sample_rate(struct minstrel_ht_sta *mi, int type, int idx) |
787 | { |
788 | int i; |
789 | |
790 | for (i = 0; i < MINSTREL_SAMPLE_RATES; i++) { |
791 | u16 cur = mi->sample[type].sample_rates[i]; |
792 | |
793 | if (cur == idx) |
794 | return true; |
795 | |
796 | if (!cur) |
797 | break; |
798 | } |
799 | |
800 | return false; |
801 | } |
802 | |
803 | static int |
804 | minstrel_ht_move_sample_rates(struct minstrel_ht_sta *mi, int type, |
805 | u32 fast_rate_dur, u32 slow_rate_dur) |
806 | { |
807 | u16 *rates = mi->sample[type].sample_rates; |
808 | int i, j; |
809 | |
810 | for (i = 0, j = 0; i < MINSTREL_SAMPLE_RATES; i++) { |
811 | u32 duration; |
812 | bool valid = false; |
813 | u16 cur; |
814 | |
815 | cur = rates[i]; |
816 | if (!cur) |
817 | continue; |
818 | |
819 | duration = minstrel_get_duration(index: cur); |
820 | switch (type) { |
821 | case MINSTREL_SAMPLE_TYPE_SLOW: |
822 | valid = duration > fast_rate_dur && |
823 | duration < slow_rate_dur; |
824 | break; |
825 | case MINSTREL_SAMPLE_TYPE_INC: |
826 | case MINSTREL_SAMPLE_TYPE_JUMP: |
827 | valid = duration < fast_rate_dur; |
828 | break; |
829 | default: |
830 | valid = false; |
831 | break; |
832 | } |
833 | |
834 | if (!valid) { |
835 | rates[i] = 0; |
836 | continue; |
837 | } |
838 | |
839 | if (i == j) |
840 | continue; |
841 | |
842 | rates[j++] = cur; |
843 | rates[i] = 0; |
844 | } |
845 | |
846 | return j; |
847 | } |
848 | |
849 | static int |
850 | minstrel_ht_group_min_rate_offset(struct minstrel_ht_sta *mi, int group, |
851 | u32 max_duration) |
852 | { |
853 | u16 supported = mi->supported[group]; |
854 | int i; |
855 | |
856 | for (i = 0; i < MCS_GROUP_RATES && supported; i++, supported >>= 1) { |
857 | if (!(supported & BIT(0))) |
858 | continue; |
859 | |
860 | if (minstrel_get_duration(MI_RATE(group, i)) >= max_duration) |
861 | continue; |
862 | |
863 | return i; |
864 | } |
865 | |
866 | return -1; |
867 | } |
868 | |
869 | /* |
870 | * Incremental update rates: |
871 | * Flip through groups and pick the first group rate that is faster than the |
872 | * highest currently selected rate |
873 | */ |
874 | static u16 |
875 | minstrel_ht_next_inc_rate(struct minstrel_ht_sta *mi, u32 fast_rate_dur) |
876 | { |
877 | u8 type = MINSTREL_SAMPLE_TYPE_INC; |
878 | int i, index = 0; |
879 | u8 group; |
880 | |
881 | group = mi->sample[type].sample_group; |
882 | for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) { |
883 | group = (group + 1) % ARRAY_SIZE(minstrel_mcs_groups); |
884 | |
885 | index = minstrel_ht_group_min_rate_offset(mi, group, |
886 | max_duration: fast_rate_dur); |
887 | if (index < 0) |
888 | continue; |
889 | |
890 | index = MI_RATE(group, index & 0xf); |
891 | if (!minstrel_ht_find_sample_rate(mi, type, idx: index)) |
892 | goto out; |
893 | } |
894 | index = 0; |
895 | |
896 | out: |
897 | mi->sample[type].sample_group = group; |
898 | |
899 | return index; |
900 | } |
901 | |
902 | static int |
903 | minstrel_ht_next_group_sample_rate(struct minstrel_ht_sta *mi, int group, |
904 | u16 supported, int offset) |
905 | { |
906 | struct minstrel_mcs_group_data *mg = &mi->groups[group]; |
907 | u16 idx; |
908 | int i; |
909 | |
910 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
911 | idx = sample_table[mg->column][mg->index]; |
912 | if (++mg->index >= MCS_GROUP_RATES) { |
913 | mg->index = 0; |
914 | if (++mg->column >= ARRAY_SIZE(sample_table)) |
915 | mg->column = 0; |
916 | } |
917 | |
918 | if (idx < offset) |
919 | continue; |
920 | |
921 | if (!(supported & BIT(idx))) |
922 | continue; |
923 | |
924 | return MI_RATE(group, idx); |
925 | } |
926 | |
927 | return -1; |
928 | } |
929 | |
930 | /* |
931 | * Jump rates: |
932 | * Sample random rates, use those that are faster than the highest |
933 | * currently selected rate. Rates between the fastest and the slowest |
934 | * get sorted into the slow sample bucket, but only if it has room |
935 | */ |
936 | static u16 |
937 | minstrel_ht_next_jump_rate(struct minstrel_ht_sta *mi, u32 fast_rate_dur, |
938 | u32 slow_rate_dur, int *slow_rate_ofs) |
939 | { |
940 | struct minstrel_rate_stats *mrs; |
941 | u32 max_duration = slow_rate_dur; |
942 | int i, index, offset; |
943 | u16 *slow_rates; |
944 | u16 supported; |
945 | u32 duration; |
946 | u8 group; |
947 | |
948 | if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES) |
949 | max_duration = fast_rate_dur; |
950 | |
951 | slow_rates = mi->sample[MINSTREL_SAMPLE_TYPE_SLOW].sample_rates; |
952 | group = mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_group; |
953 | for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) { |
954 | u8 type; |
955 | |
956 | group = (group + 1) % ARRAY_SIZE(minstrel_mcs_groups); |
957 | |
958 | supported = mi->supported[group]; |
959 | if (!supported) |
960 | continue; |
961 | |
962 | offset = minstrel_ht_group_min_rate_offset(mi, group, |
963 | max_duration); |
964 | if (offset < 0) |
965 | continue; |
966 | |
967 | index = minstrel_ht_next_group_sample_rate(mi, group, supported, |
968 | offset); |
969 | if (index < 0) |
970 | continue; |
971 | |
972 | duration = minstrel_get_duration(index); |
973 | if (duration < fast_rate_dur) |
974 | type = MINSTREL_SAMPLE_TYPE_JUMP; |
975 | else |
976 | type = MINSTREL_SAMPLE_TYPE_SLOW; |
977 | |
978 | if (minstrel_ht_find_sample_rate(mi, type, idx: index)) |
979 | continue; |
980 | |
981 | if (type == MINSTREL_SAMPLE_TYPE_JUMP) |
982 | goto found; |
983 | |
984 | if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES) |
985 | continue; |
986 | |
987 | if (duration >= slow_rate_dur) |
988 | continue; |
989 | |
990 | /* skip slow rates with high success probability */ |
991 | mrs = minstrel_get_ratestats(mi, index); |
992 | if (mrs->prob_avg > MINSTREL_FRAC(95, 100)) |
993 | continue; |
994 | |
995 | slow_rates[(*slow_rate_ofs)++] = index; |
996 | if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES) |
997 | max_duration = fast_rate_dur; |
998 | } |
999 | index = 0; |
1000 | |
1001 | found: |
1002 | mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_group = group; |
1003 | |
1004 | return index; |
1005 | } |
1006 | |
1007 | static void |
1008 | minstrel_ht_refill_sample_rates(struct minstrel_ht_sta *mi) |
1009 | { |
1010 | u32 prob_dur = minstrel_get_duration(index: mi->max_prob_rate); |
1011 | u32 tp_dur = minstrel_get_duration(index: mi->max_tp_rate[0]); |
1012 | u32 tp2_dur = minstrel_get_duration(index: mi->max_tp_rate[1]); |
1013 | u32 fast_rate_dur = min(min(tp_dur, tp2_dur), prob_dur); |
1014 | u32 slow_rate_dur = max(max(tp_dur, tp2_dur), prob_dur); |
1015 | u16 *rates; |
1016 | int i, j; |
1017 | |
1018 | rates = mi->sample[MINSTREL_SAMPLE_TYPE_INC].sample_rates; |
1019 | i = minstrel_ht_move_sample_rates(mi, type: MINSTREL_SAMPLE_TYPE_INC, |
1020 | fast_rate_dur, slow_rate_dur); |
1021 | while (i < MINSTREL_SAMPLE_RATES) { |
1022 | rates[i] = minstrel_ht_next_inc_rate(mi, fast_rate_dur: tp_dur); |
1023 | if (!rates[i]) |
1024 | break; |
1025 | |
1026 | i++; |
1027 | } |
1028 | |
1029 | rates = mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_rates; |
1030 | i = minstrel_ht_move_sample_rates(mi, type: MINSTREL_SAMPLE_TYPE_JUMP, |
1031 | fast_rate_dur, slow_rate_dur); |
1032 | j = minstrel_ht_move_sample_rates(mi, type: MINSTREL_SAMPLE_TYPE_SLOW, |
1033 | fast_rate_dur, slow_rate_dur); |
1034 | while (i < MINSTREL_SAMPLE_RATES) { |
1035 | rates[i] = minstrel_ht_next_jump_rate(mi, fast_rate_dur, |
1036 | slow_rate_dur, slow_rate_ofs: &j); |
1037 | if (!rates[i]) |
1038 | break; |
1039 | |
1040 | i++; |
1041 | } |
1042 | |
1043 | for (i = 0; i < ARRAY_SIZE(mi->sample); i++) |
1044 | memcpy(mi->sample[i].cur_sample_rates, mi->sample[i].sample_rates, |
1045 | sizeof(mi->sample[i].cur_sample_rates)); |
1046 | } |
1047 | |
1048 | |
1049 | /* |
1050 | * Update rate statistics and select new primary rates |
1051 | * |
1052 | * Rules for rate selection: |
1053 | * - max_prob_rate must use only one stream, as a tradeoff between delivery |
1054 | * probability and throughput during strong fluctuations |
1055 | * - as long as the max prob rate has a probability of more than 75%, pick |
1056 | * higher throughput rates, even if the probablity is a bit lower |
1057 | */ |
1058 | static void |
1059 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
1060 | { |
1061 | struct minstrel_mcs_group_data *mg; |
1062 | struct minstrel_rate_stats *mrs; |
1063 | int group, i, j, cur_prob; |
1064 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES]; |
1065 | u16 tmp_legacy_tp_rate[MAX_THR_RATES], tmp_max_prob_rate; |
1066 | u16 index; |
1067 | bool ht_supported = mi->sta->deflink.ht_cap.ht_supported; |
1068 | |
1069 | if (mi->ampdu_packets > 0) { |
1070 | if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN)) |
1071 | mi->avg_ampdu_len = minstrel_ewma(old: mi->avg_ampdu_len, |
1072 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), |
1073 | EWMA_LEVEL); |
1074 | else |
1075 | mi->avg_ampdu_len = 0; |
1076 | mi->ampdu_len = 0; |
1077 | mi->ampdu_packets = 0; |
1078 | } |
1079 | |
1080 | if (mi->supported[MINSTREL_CCK_GROUP]) |
1081 | group = MINSTREL_CCK_GROUP; |
1082 | else if (mi->supported[MINSTREL_OFDM_GROUP]) |
1083 | group = MINSTREL_OFDM_GROUP; |
1084 | else |
1085 | group = 0; |
1086 | |
1087 | index = MI_RATE(group, 0); |
1088 | for (j = 0; j < ARRAY_SIZE(tmp_legacy_tp_rate); j++) |
1089 | tmp_legacy_tp_rate[j] = index; |
1090 | |
1091 | if (mi->supported[MINSTREL_VHT_GROUP_0]) |
1092 | group = MINSTREL_VHT_GROUP_0; |
1093 | else if (ht_supported) |
1094 | group = MINSTREL_HT_GROUP_0; |
1095 | else if (mi->supported[MINSTREL_CCK_GROUP]) |
1096 | group = MINSTREL_CCK_GROUP; |
1097 | else |
1098 | group = MINSTREL_OFDM_GROUP; |
1099 | |
1100 | index = MI_RATE(group, 0); |
1101 | tmp_max_prob_rate = index; |
1102 | for (j = 0; j < ARRAY_SIZE(tmp_mcs_tp_rate); j++) |
1103 | tmp_mcs_tp_rate[j] = index; |
1104 | |
1105 | /* Find best rate sets within all MCS groups*/ |
1106 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
1107 | u16 *tp_rate = tmp_mcs_tp_rate; |
1108 | u16 last_prob = 0; |
1109 | |
1110 | mg = &mi->groups[group]; |
1111 | if (!mi->supported[group]) |
1112 | continue; |
1113 | |
1114 | /* (re)Initialize group rate indexes */ |
1115 | for(j = 0; j < MAX_THR_RATES; j++) |
1116 | tmp_group_tp_rate[j] = MI_RATE(group, 0); |
1117 | |
1118 | if (group == MINSTREL_CCK_GROUP && ht_supported) |
1119 | tp_rate = tmp_legacy_tp_rate; |
1120 | |
1121 | for (i = MCS_GROUP_RATES - 1; i >= 0; i--) { |
1122 | if (!(mi->supported[group] & BIT(i))) |
1123 | continue; |
1124 | |
1125 | index = MI_RATE(group, i); |
1126 | |
1127 | mrs = &mg->rates[i]; |
1128 | mrs->retry_updated = false; |
1129 | minstrel_ht_calc_rate_stats(mp, mrs); |
1130 | |
1131 | if (mrs->att_hist) |
1132 | last_prob = max(last_prob, mrs->prob_avg); |
1133 | else |
1134 | mrs->prob_avg = max(last_prob, mrs->prob_avg); |
1135 | cur_prob = mrs->prob_avg; |
1136 | |
1137 | if (minstrel_ht_get_tp_avg(mi, group, rate: i, prob_avg: cur_prob) == 0) |
1138 | continue; |
1139 | |
1140 | /* Find max throughput rate set */ |
1141 | minstrel_ht_sort_best_tp_rates(mi, index, tp_list: tp_rate); |
1142 | |
1143 | /* Find max throughput rate set within a group */ |
1144 | minstrel_ht_sort_best_tp_rates(mi, index, |
1145 | tp_list: tmp_group_tp_rate); |
1146 | } |
1147 | |
1148 | memcpy(mg->max_group_tp_rate, tmp_group_tp_rate, |
1149 | sizeof(mg->max_group_tp_rate)); |
1150 | } |
1151 | |
1152 | /* Assign new rate set per sta */ |
1153 | minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, |
1154 | tmp_legacy_tp_rate); |
1155 | memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate)); |
1156 | |
1157 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
1158 | if (!mi->supported[group]) |
1159 | continue; |
1160 | |
1161 | mg = &mi->groups[group]; |
1162 | mg->max_group_prob_rate = MI_RATE(group, 0); |
1163 | |
1164 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
1165 | if (!(mi->supported[group] & BIT(i))) |
1166 | continue; |
1167 | |
1168 | index = MI_RATE(group, i); |
1169 | |
1170 | /* Find max probability rate per group and global */ |
1171 | minstrel_ht_set_best_prob_rate(mi, dest: &tmp_max_prob_rate, |
1172 | index); |
1173 | } |
1174 | } |
1175 | |
1176 | mi->max_prob_rate = tmp_max_prob_rate; |
1177 | |
1178 | /* Try to increase robustness of max_prob_rate*/ |
1179 | minstrel_ht_prob_rate_reduce_streams(mi); |
1180 | minstrel_ht_refill_sample_rates(mi); |
1181 | |
1182 | #ifdef CONFIG_MAC80211_DEBUGFS |
1183 | /* use fixed index if set */ |
1184 | if (mp->fixed_rate_idx != -1) { |
1185 | for (i = 0; i < 4; i++) |
1186 | mi->max_tp_rate[i] = mp->fixed_rate_idx; |
1187 | mi->max_prob_rate = mp->fixed_rate_idx; |
1188 | } |
1189 | #endif |
1190 | |
1191 | /* Reset update timer */ |
1192 | mi->last_stats_update = jiffies; |
1193 | mi->sample_time = jiffies; |
1194 | } |
1195 | |
1196 | static bool |
1197 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
1198 | struct ieee80211_tx_rate *rate) |
1199 | { |
1200 | int i; |
1201 | |
1202 | if (rate->idx < 0) |
1203 | return false; |
1204 | |
1205 | if (!rate->count) |
1206 | return false; |
1207 | |
1208 | if (rate->flags & IEEE80211_TX_RC_MCS || |
1209 | rate->flags & IEEE80211_TX_RC_VHT_MCS) |
1210 | return true; |
1211 | |
1212 | for (i = 0; i < ARRAY_SIZE(mp->cck_rates); i++) |
1213 | if (rate->idx == mp->cck_rates[i]) |
1214 | return true; |
1215 | |
1216 | for (i = 0; i < ARRAY_SIZE(mp->ofdm_rates[0]); i++) |
1217 | if (rate->idx == mp->ofdm_rates[mi->band][i]) |
1218 | return true; |
1219 | |
1220 | return false; |
1221 | } |
1222 | |
1223 | /* |
1224 | * Check whether rate_status contains valid information. |
1225 | */ |
1226 | static bool |
1227 | minstrel_ht_ri_txstat_valid(struct minstrel_priv *mp, |
1228 | struct minstrel_ht_sta *mi, |
1229 | struct ieee80211_rate_status *rate_status) |
1230 | { |
1231 | int i; |
1232 | |
1233 | if (!rate_status) |
1234 | return false; |
1235 | if (!rate_status->try_count) |
1236 | return false; |
1237 | |
1238 | if (rate_status->rate_idx.flags & RATE_INFO_FLAGS_MCS || |
1239 | rate_status->rate_idx.flags & RATE_INFO_FLAGS_VHT_MCS) |
1240 | return true; |
1241 | |
1242 | for (i = 0; i < ARRAY_SIZE(mp->cck_rates); i++) { |
1243 | if (rate_status->rate_idx.legacy == |
1244 | minstrel_cck_bitrates[ mp->cck_rates[i] ]) |
1245 | return true; |
1246 | } |
1247 | |
1248 | for (i = 0; i < ARRAY_SIZE(mp->ofdm_rates); i++) { |
1249 | if (rate_status->rate_idx.legacy == |
1250 | minstrel_ofdm_bitrates[ mp->ofdm_rates[mi->band][i] ]) |
1251 | return true; |
1252 | } |
1253 | |
1254 | return false; |
1255 | } |
1256 | |
1257 | static void |
1258 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u16 *idx, bool primary) |
1259 | { |
1260 | int group, orig_group; |
1261 | |
1262 | orig_group = group = MI_RATE_GROUP(*idx); |
1263 | while (group > 0) { |
1264 | group--; |
1265 | |
1266 | if (!mi->supported[group]) |
1267 | continue; |
1268 | |
1269 | if (minstrel_mcs_groups[group].streams > |
1270 | minstrel_mcs_groups[orig_group].streams) |
1271 | continue; |
1272 | |
1273 | if (primary) |
1274 | *idx = mi->groups[group].max_group_tp_rate[0]; |
1275 | else |
1276 | *idx = mi->groups[group].max_group_tp_rate[1]; |
1277 | break; |
1278 | } |
1279 | } |
1280 | |
1281 | static void |
1282 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, |
1283 | void *priv_sta, struct ieee80211_tx_status *st) |
1284 | { |
1285 | struct ieee80211_tx_info *info = st->info; |
1286 | struct minstrel_ht_sta *mi = priv_sta; |
1287 | struct ieee80211_tx_rate *ar = info->status.rates; |
1288 | struct minstrel_rate_stats *rate, *rate2; |
1289 | struct minstrel_priv *mp = priv; |
1290 | u32 update_interval = mp->update_interval; |
1291 | bool last, update = false; |
1292 | int i; |
1293 | |
1294 | /* Ignore packet that was sent with noAck flag */ |
1295 | if (info->flags & IEEE80211_TX_CTL_NO_ACK) |
1296 | return; |
1297 | |
1298 | /* This packet was aggregated but doesn't carry status info */ |
1299 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && |
1300 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) |
1301 | return; |
1302 | |
1303 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
1304 | info->status.ampdu_ack_len = |
1305 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); |
1306 | info->status.ampdu_len = 1; |
1307 | } |
1308 | |
1309 | /* wraparound */ |
1310 | if (mi->total_packets >= ~0 - info->status.ampdu_len) { |
1311 | mi->total_packets = 0; |
1312 | mi->sample_packets = 0; |
1313 | } |
1314 | |
1315 | mi->total_packets += info->status.ampdu_len; |
1316 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
1317 | mi->sample_packets += info->status.ampdu_len; |
1318 | |
1319 | mi->ampdu_packets++; |
1320 | mi->ampdu_len += info->status.ampdu_len; |
1321 | |
1322 | if (st->rates && st->n_rates) { |
1323 | last = !minstrel_ht_ri_txstat_valid(mp, mi, rate_status: &(st->rates[0])); |
1324 | for (i = 0; !last; i++) { |
1325 | last = (i == st->n_rates - 1) || |
1326 | !minstrel_ht_ri_txstat_valid(mp, mi, |
1327 | rate_status: &(st->rates[i + 1])); |
1328 | |
1329 | rate = minstrel_ht_ri_get_stats(mp, mi, |
1330 | rate_status: &(st->rates[i])); |
1331 | |
1332 | if (last) |
1333 | rate->success += info->status.ampdu_ack_len; |
1334 | |
1335 | rate->attempts += st->rates[i].try_count * |
1336 | info->status.ampdu_len; |
1337 | } |
1338 | } else { |
1339 | last = !minstrel_ht_txstat_valid(mp, mi, rate: &ar[0]); |
1340 | for (i = 0; !last; i++) { |
1341 | last = (i == IEEE80211_TX_MAX_RATES - 1) || |
1342 | !minstrel_ht_txstat_valid(mp, mi, rate: &ar[i + 1]); |
1343 | |
1344 | rate = minstrel_ht_get_stats(mp, mi, rate: &ar[i]); |
1345 | if (last) |
1346 | rate->success += info->status.ampdu_ack_len; |
1347 | |
1348 | rate->attempts += ar[i].count * info->status.ampdu_len; |
1349 | } |
1350 | } |
1351 | |
1352 | if (mp->hw->max_rates > 1) { |
1353 | /* |
1354 | * check for sudden death of spatial multiplexing, |
1355 | * downgrade to a lower number of streams if necessary. |
1356 | */ |
1357 | rate = minstrel_get_ratestats(mi, index: mi->max_tp_rate[0]); |
1358 | if (rate->attempts > 30 && |
1359 | rate->success < rate->attempts / 4) { |
1360 | minstrel_downgrade_rate(mi, idx: &mi->max_tp_rate[0], primary: true); |
1361 | update = true; |
1362 | } |
1363 | |
1364 | rate2 = minstrel_get_ratestats(mi, index: mi->max_tp_rate[1]); |
1365 | if (rate2->attempts > 30 && |
1366 | rate2->success < rate2->attempts / 4) { |
1367 | minstrel_downgrade_rate(mi, idx: &mi->max_tp_rate[1], primary: false); |
1368 | update = true; |
1369 | } |
1370 | } |
1371 | |
1372 | if (time_after(jiffies, mi->last_stats_update + update_interval)) { |
1373 | update = true; |
1374 | minstrel_ht_update_stats(mp, mi); |
1375 | } |
1376 | |
1377 | if (update) |
1378 | minstrel_ht_update_rates(mp, mi); |
1379 | } |
1380 | |
1381 | static void |
1382 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
1383 | int index) |
1384 | { |
1385 | struct minstrel_rate_stats *mrs; |
1386 | unsigned int tx_time, tx_time_rtscts, tx_time_data; |
1387 | unsigned int cw = mp->cw_min; |
1388 | unsigned int ctime = 0; |
1389 | unsigned int t_slot = 9; /* FIXME */ |
1390 | unsigned int ampdu_len = minstrel_ht_avg_ampdu_len(mi); |
1391 | unsigned int overhead = 0, overhead_rtscts = 0; |
1392 | |
1393 | mrs = minstrel_get_ratestats(mi, index); |
1394 | if (mrs->prob_avg < MINSTREL_FRAC(1, 10)) { |
1395 | mrs->retry_count = 1; |
1396 | mrs->retry_count_rtscts = 1; |
1397 | return; |
1398 | } |
1399 | |
1400 | mrs->retry_count = 2; |
1401 | mrs->retry_count_rtscts = 2; |
1402 | mrs->retry_updated = true; |
1403 | |
1404 | tx_time_data = minstrel_get_duration(index) * ampdu_len / 1000; |
1405 | |
1406 | /* Contention time for first 2 tries */ |
1407 | ctime = (t_slot * cw) >> 1; |
1408 | cw = min((cw << 1) | 1, mp->cw_max); |
1409 | ctime += (t_slot * cw) >> 1; |
1410 | cw = min((cw << 1) | 1, mp->cw_max); |
1411 | |
1412 | if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(index))) { |
1413 | overhead = mi->overhead_legacy; |
1414 | overhead_rtscts = mi->overhead_legacy_rtscts; |
1415 | } else { |
1416 | overhead = mi->overhead; |
1417 | overhead_rtscts = mi->overhead_rtscts; |
1418 | } |
1419 | |
1420 | /* Total TX time for data and Contention after first 2 tries */ |
1421 | tx_time = ctime + 2 * (overhead + tx_time_data); |
1422 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); |
1423 | |
1424 | /* See how many more tries we can fit inside segment size */ |
1425 | do { |
1426 | /* Contention time for this try */ |
1427 | ctime = (t_slot * cw) >> 1; |
1428 | cw = min((cw << 1) | 1, mp->cw_max); |
1429 | |
1430 | /* Total TX time after this try */ |
1431 | tx_time += ctime + overhead + tx_time_data; |
1432 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; |
1433 | |
1434 | if (tx_time_rtscts < mp->segment_size) |
1435 | mrs->retry_count_rtscts++; |
1436 | } while ((tx_time < mp->segment_size) && |
1437 | (++mrs->retry_count < mp->max_retry)); |
1438 | } |
1439 | |
1440 | |
1441 | static void |
1442 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
1443 | struct ieee80211_sta_rates *ratetbl, int offset, int index) |
1444 | { |
1445 | int group_idx = MI_RATE_GROUP(index); |
1446 | const struct mcs_group *group = &minstrel_mcs_groups[group_idx]; |
1447 | struct minstrel_rate_stats *mrs; |
1448 | u8 idx; |
1449 | u16 flags = group->flags; |
1450 | |
1451 | mrs = minstrel_get_ratestats(mi, index); |
1452 | if (!mrs->retry_updated) |
1453 | minstrel_calc_retransmit(mp, mi, index); |
1454 | |
1455 | if (mrs->prob_avg < MINSTREL_FRAC(20, 100) || !mrs->retry_count) { |
1456 | ratetbl->rate[offset].count = 2; |
1457 | ratetbl->rate[offset].count_rts = 2; |
1458 | ratetbl->rate[offset].count_cts = 2; |
1459 | } else { |
1460 | ratetbl->rate[offset].count = mrs->retry_count; |
1461 | ratetbl->rate[offset].count_cts = mrs->retry_count; |
1462 | ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts; |
1463 | } |
1464 | |
1465 | index = MI_RATE_IDX(index); |
1466 | if (group_idx == MINSTREL_CCK_GROUP) |
1467 | idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
1468 | else if (group_idx == MINSTREL_OFDM_GROUP) |
1469 | idx = mp->ofdm_rates[mi->band][index % |
1470 | ARRAY_SIZE(mp->ofdm_rates[0])]; |
1471 | else if (flags & IEEE80211_TX_RC_VHT_MCS) |
1472 | idx = ((group->streams - 1) << 4) | |
1473 | (index & 0xF); |
1474 | else |
1475 | idx = index + (group->streams - 1) * 8; |
1476 | |
1477 | /* enable RTS/CTS if needed: |
1478 | * - if station is in dynamic SMPS (and streams > 1) |
1479 | * - for fallback rates, to increase chances of getting through |
1480 | */ |
1481 | if (offset > 0 || |
1482 | (mi->sta->deflink.smps_mode == IEEE80211_SMPS_DYNAMIC && |
1483 | group->streams > 1)) { |
1484 | ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; |
1485 | flags |= IEEE80211_TX_RC_USE_RTS_CTS; |
1486 | } |
1487 | |
1488 | ratetbl->rate[offset].idx = idx; |
1489 | ratetbl->rate[offset].flags = flags; |
1490 | } |
1491 | |
1492 | static inline int |
1493 | minstrel_ht_get_prob_avg(struct minstrel_ht_sta *mi, int rate) |
1494 | { |
1495 | int group = MI_RATE_GROUP(rate); |
1496 | rate = MI_RATE_IDX(rate); |
1497 | return mi->groups[group].rates[rate].prob_avg; |
1498 | } |
1499 | |
1500 | static int |
1501 | minstrel_ht_get_max_amsdu_len(struct minstrel_ht_sta *mi) |
1502 | { |
1503 | int group = MI_RATE_GROUP(mi->max_prob_rate); |
1504 | const struct mcs_group *g = &minstrel_mcs_groups[group]; |
1505 | int rate = MI_RATE_IDX(mi->max_prob_rate); |
1506 | unsigned int duration; |
1507 | |
1508 | /* Disable A-MSDU if max_prob_rate is bad */ |
1509 | if (mi->groups[group].rates[rate].prob_avg < MINSTREL_FRAC(50, 100)) |
1510 | return 1; |
1511 | |
1512 | duration = g->duration[rate]; |
1513 | duration <<= g->shift; |
1514 | |
1515 | /* If the rate is slower than single-stream MCS1, make A-MSDU limit small */ |
1516 | if (duration > MCS_DURATION(1, 0, 52)) |
1517 | return 500; |
1518 | |
1519 | /* |
1520 | * If the rate is slower than single-stream MCS4, limit A-MSDU to usual |
1521 | * data packet size |
1522 | */ |
1523 | if (duration > MCS_DURATION(1, 0, 104)) |
1524 | return 1600; |
1525 | |
1526 | /* |
1527 | * If the rate is slower than single-stream MCS7, or if the max throughput |
1528 | * rate success probability is less than 75%, limit A-MSDU to twice the usual |
1529 | * data packet size |
1530 | */ |
1531 | if (duration > MCS_DURATION(1, 0, 260) || |
1532 | (minstrel_ht_get_prob_avg(mi, rate: mi->max_tp_rate[0]) < |
1533 | MINSTREL_FRAC(75, 100))) |
1534 | return 3200; |
1535 | |
1536 | /* |
1537 | * HT A-MPDU limits maximum MPDU size under BA agreement to 4095 bytes. |
1538 | * Since aggregation sessions are started/stopped without txq flush, use |
1539 | * the limit here to avoid the complexity of having to de-aggregate |
1540 | * packets in the queue. |
1541 | */ |
1542 | if (!mi->sta->deflink.vht_cap.vht_supported) |
1543 | return IEEE80211_MAX_MPDU_LEN_HT_BA; |
1544 | |
1545 | /* unlimited */ |
1546 | return 0; |
1547 | } |
1548 | |
1549 | static void |
1550 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
1551 | { |
1552 | struct ieee80211_sta_rates *rates; |
1553 | int i = 0; |
1554 | int max_rates = min_t(int, mp->hw->max_rates, IEEE80211_TX_RATE_TABLE_SIZE); |
1555 | |
1556 | rates = kzalloc(size: sizeof(*rates), GFP_ATOMIC); |
1557 | if (!rates) |
1558 | return; |
1559 | |
1560 | /* Start with max_tp_rate[0] */ |
1561 | minstrel_ht_set_rate(mp, mi, ratetbl: rates, offset: i++, index: mi->max_tp_rate[0]); |
1562 | |
1563 | /* Fill up remaining, keep one entry for max_probe_rate */ |
1564 | for (; i < (max_rates - 1); i++) |
1565 | minstrel_ht_set_rate(mp, mi, ratetbl: rates, offset: i, index: mi->max_tp_rate[i]); |
1566 | |
1567 | if (i < max_rates) |
1568 | minstrel_ht_set_rate(mp, mi, ratetbl: rates, offset: i++, index: mi->max_prob_rate); |
1569 | |
1570 | if (i < IEEE80211_TX_RATE_TABLE_SIZE) |
1571 | rates->rate[i].idx = -1; |
1572 | |
1573 | mi->sta->deflink.agg.max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi); |
1574 | ieee80211_sta_recalc_aggregates(pubsta: mi->sta); |
1575 | rate_control_set_rates(hw: mp->hw, pubsta: mi->sta, rates); |
1576 | } |
1577 | |
1578 | static u16 |
1579 | minstrel_ht_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
1580 | { |
1581 | u8 seq; |
1582 | |
1583 | if (mp->hw->max_rates > 1) { |
1584 | seq = mi->sample_seq; |
1585 | mi->sample_seq = (seq + 1) % ARRAY_SIZE(minstrel_sample_seq); |
1586 | seq = minstrel_sample_seq[seq]; |
1587 | } else { |
1588 | seq = MINSTREL_SAMPLE_TYPE_INC; |
1589 | } |
1590 | |
1591 | return __minstrel_ht_get_sample_rate(mi, type: seq); |
1592 | } |
1593 | |
1594 | static void |
1595 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, |
1596 | struct ieee80211_tx_rate_control *txrc) |
1597 | { |
1598 | const struct mcs_group *sample_group; |
1599 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: txrc->skb); |
1600 | struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
1601 | struct minstrel_ht_sta *mi = priv_sta; |
1602 | struct minstrel_priv *mp = priv; |
1603 | u16 sample_idx; |
1604 | |
1605 | info->flags |= mi->tx_flags; |
1606 | |
1607 | #ifdef CONFIG_MAC80211_DEBUGFS |
1608 | if (mp->fixed_rate_idx != -1) |
1609 | return; |
1610 | #endif |
1611 | |
1612 | /* Don't use EAPOL frames for sampling on non-mrr hw */ |
1613 | if (mp->hw->max_rates == 1 && |
1614 | (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
1615 | return; |
1616 | |
1617 | if (time_is_after_jiffies(mi->sample_time)) |
1618 | return; |
1619 | |
1620 | mi->sample_time = jiffies + MINSTREL_SAMPLE_INTERVAL; |
1621 | sample_idx = minstrel_ht_get_sample_rate(mp, mi); |
1622 | if (!sample_idx) |
1623 | return; |
1624 | |
1625 | sample_group = &minstrel_mcs_groups[MI_RATE_GROUP(sample_idx)]; |
1626 | sample_idx = MI_RATE_IDX(sample_idx); |
1627 | |
1628 | if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP] && |
1629 | (sample_idx >= 4) != txrc->short_preamble) |
1630 | return; |
1631 | |
1632 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
1633 | rate->count = 1; |
1634 | |
1635 | if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP]) { |
1636 | int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); |
1637 | rate->idx = mp->cck_rates[idx]; |
1638 | } else if (sample_group == &minstrel_mcs_groups[MINSTREL_OFDM_GROUP]) { |
1639 | int idx = sample_idx % ARRAY_SIZE(mp->ofdm_rates[0]); |
1640 | rate->idx = mp->ofdm_rates[mi->band][idx]; |
1641 | } else if (sample_group->flags & IEEE80211_TX_RC_VHT_MCS) { |
1642 | ieee80211_rate_set_vht(rate, MI_RATE_IDX(sample_idx), |
1643 | nss: sample_group->streams); |
1644 | } else { |
1645 | rate->idx = sample_idx + (sample_group->streams - 1) * 8; |
1646 | } |
1647 | |
1648 | rate->flags = sample_group->flags; |
1649 | } |
1650 | |
1651 | static void |
1652 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
1653 | struct ieee80211_supported_band *sband, |
1654 | struct ieee80211_sta *sta) |
1655 | { |
1656 | int i; |
1657 | |
1658 | if (sband->band != NL80211_BAND_2GHZ) |
1659 | return; |
1660 | |
1661 | if (sta->deflink.ht_cap.ht_supported && |
1662 | !ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES)) |
1663 | return; |
1664 | |
1665 | for (i = 0; i < 4; i++) { |
1666 | if (mp->cck_rates[i] == 0xff || |
1667 | !rate_supported(sta, band: sband->band, index: mp->cck_rates[i])) |
1668 | continue; |
1669 | |
1670 | mi->supported[MINSTREL_CCK_GROUP] |= BIT(i); |
1671 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) |
1672 | mi->supported[MINSTREL_CCK_GROUP] |= BIT(i + 4); |
1673 | } |
1674 | } |
1675 | |
1676 | static void |
1677 | minstrel_ht_update_ofdm(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
1678 | struct ieee80211_supported_band *sband, |
1679 | struct ieee80211_sta *sta) |
1680 | { |
1681 | const u8 *rates; |
1682 | int i; |
1683 | |
1684 | if (sta->deflink.ht_cap.ht_supported) |
1685 | return; |
1686 | |
1687 | rates = mp->ofdm_rates[sband->band]; |
1688 | for (i = 0; i < ARRAY_SIZE(mp->ofdm_rates[0]); i++) { |
1689 | if (rates[i] == 0xff || |
1690 | !rate_supported(sta, band: sband->band, index: rates[i])) |
1691 | continue; |
1692 | |
1693 | mi->supported[MINSTREL_OFDM_GROUP] |= BIT(i); |
1694 | } |
1695 | } |
1696 | |
1697 | static void |
1698 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, |
1699 | struct cfg80211_chan_def *chandef, |
1700 | struct ieee80211_sta *sta, void *priv_sta) |
1701 | { |
1702 | struct minstrel_priv *mp = priv; |
1703 | struct minstrel_ht_sta *mi = priv_sta; |
1704 | struct ieee80211_mcs_info *mcs = &sta->deflink.ht_cap.mcs; |
1705 | u16 ht_cap = sta->deflink.ht_cap.cap; |
1706 | struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap; |
1707 | const struct ieee80211_rate *ctl_rate; |
1708 | struct sta_info *sta_info; |
1709 | bool ldpc, erp; |
1710 | int use_vht; |
1711 | int ack_dur; |
1712 | int stbc; |
1713 | int i; |
1714 | |
1715 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB); |
1716 | |
1717 | if (vht_cap->vht_supported) |
1718 | use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0); |
1719 | else |
1720 | use_vht = 0; |
1721 | |
1722 | memset(mi, 0, sizeof(*mi)); |
1723 | |
1724 | mi->sta = sta; |
1725 | mi->band = sband->band; |
1726 | mi->last_stats_update = jiffies; |
1727 | |
1728 | ack_dur = ieee80211_frame_duration(band: sband->band, len: 10, rate: 60, erp: 1, short_preamble: 1); |
1729 | mi->overhead = ieee80211_frame_duration(band: sband->band, len: 0, rate: 60, erp: 1, short_preamble: 1); |
1730 | mi->overhead += ack_dur; |
1731 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
1732 | |
1733 | ctl_rate = &sband->bitrates[rate_lowest_index(sband, sta)]; |
1734 | erp = ctl_rate->flags & IEEE80211_RATE_ERP_G; |
1735 | ack_dur = ieee80211_frame_duration(band: sband->band, len: 10, |
1736 | rate: ctl_rate->bitrate, erp, short_preamble: 1); |
1737 | mi->overhead_legacy = ack_dur; |
1738 | mi->overhead_legacy_rtscts = mi->overhead_legacy + 2 * ack_dur; |
1739 | |
1740 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); |
1741 | |
1742 | if (!use_vht) { |
1743 | stbc = (ht_cap & IEEE80211_HT_CAP_RX_STBC) >> |
1744 | IEEE80211_HT_CAP_RX_STBC_SHIFT; |
1745 | |
1746 | ldpc = ht_cap & IEEE80211_HT_CAP_LDPC_CODING; |
1747 | } else { |
1748 | stbc = (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK) >> |
1749 | IEEE80211_VHT_CAP_RXSTBC_SHIFT; |
1750 | |
1751 | ldpc = vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC; |
1752 | } |
1753 | |
1754 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; |
1755 | if (ldpc) |
1756 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; |
1757 | |
1758 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
1759 | u32 gflags = minstrel_mcs_groups[i].flags; |
1760 | int bw, nss; |
1761 | |
1762 | mi->supported[i] = 0; |
1763 | if (minstrel_ht_is_legacy_group(group: i)) |
1764 | continue; |
1765 | |
1766 | if (gflags & IEEE80211_TX_RC_SHORT_GI) { |
1767 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
1768 | if (!(ht_cap & IEEE80211_HT_CAP_SGI_40)) |
1769 | continue; |
1770 | } else { |
1771 | if (!(ht_cap & IEEE80211_HT_CAP_SGI_20)) |
1772 | continue; |
1773 | } |
1774 | } |
1775 | |
1776 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
1777 | sta->deflink.bandwidth < IEEE80211_STA_RX_BW_40) |
1778 | continue; |
1779 | |
1780 | nss = minstrel_mcs_groups[i].streams; |
1781 | |
1782 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
1783 | if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC && nss > 1) |
1784 | continue; |
1785 | |
1786 | /* HT rate */ |
1787 | if (gflags & IEEE80211_TX_RC_MCS) { |
1788 | if (use_vht && minstrel_vht_only) |
1789 | continue; |
1790 | |
1791 | mi->supported[i] = mcs->rx_mask[nss - 1]; |
1792 | continue; |
1793 | } |
1794 | |
1795 | /* VHT rate */ |
1796 | if (!vht_cap->vht_supported || |
1797 | WARN_ON(!(gflags & IEEE80211_TX_RC_VHT_MCS)) || |
1798 | WARN_ON(gflags & IEEE80211_TX_RC_160_MHZ_WIDTH)) |
1799 | continue; |
1800 | |
1801 | if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) { |
1802 | if (sta->deflink.bandwidth < IEEE80211_STA_RX_BW_80 || |
1803 | ((gflags & IEEE80211_TX_RC_SHORT_GI) && |
1804 | !(vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80))) { |
1805 | continue; |
1806 | } |
1807 | } |
1808 | |
1809 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) |
1810 | bw = BW_40; |
1811 | else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) |
1812 | bw = BW_80; |
1813 | else |
1814 | bw = BW_20; |
1815 | |
1816 | mi->supported[i] = minstrel_get_valid_vht_rates(bw, nss, |
1817 | mcs_map: vht_cap->vht_mcs.tx_mcs_map); |
1818 | } |
1819 | |
1820 | sta_info = container_of(sta, struct sta_info, sta); |
1821 | mi->use_short_preamble = test_sta_flag(sta: sta_info, flag: WLAN_STA_SHORT_PREAMBLE) && |
1822 | sta_info->sdata->vif.bss_conf.use_short_preamble; |
1823 | |
1824 | minstrel_ht_update_cck(mp, mi, sband, sta); |
1825 | minstrel_ht_update_ofdm(mp, mi, sband, sta); |
1826 | |
1827 | /* create an initial rate table with the lowest supported rates */ |
1828 | minstrel_ht_update_stats(mp, mi); |
1829 | minstrel_ht_update_rates(mp, mi); |
1830 | } |
1831 | |
1832 | static void |
1833 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, |
1834 | struct cfg80211_chan_def *chandef, |
1835 | struct ieee80211_sta *sta, void *priv_sta) |
1836 | { |
1837 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
1838 | } |
1839 | |
1840 | static void |
1841 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, |
1842 | struct cfg80211_chan_def *chandef, |
1843 | struct ieee80211_sta *sta, void *priv_sta, |
1844 | u32 changed) |
1845 | { |
1846 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
1847 | } |
1848 | |
1849 | static void * |
1850 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) |
1851 | { |
1852 | struct ieee80211_supported_band *sband; |
1853 | struct minstrel_ht_sta *mi; |
1854 | struct minstrel_priv *mp = priv; |
1855 | struct ieee80211_hw *hw = mp->hw; |
1856 | int max_rates = 0; |
1857 | int i; |
1858 | |
1859 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
1860 | sband = hw->wiphy->bands[i]; |
1861 | if (sband && sband->n_bitrates > max_rates) |
1862 | max_rates = sband->n_bitrates; |
1863 | } |
1864 | |
1865 | return kzalloc(size: sizeof(*mi), flags: gfp); |
1866 | } |
1867 | |
1868 | static void |
1869 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) |
1870 | { |
1871 | kfree(objp: priv_sta); |
1872 | } |
1873 | |
1874 | static void |
1875 | minstrel_ht_fill_rate_array(u8 *dest, struct ieee80211_supported_band *sband, |
1876 | const s16 *bitrates, int n_rates, u32 rate_flags) |
1877 | { |
1878 | int i, j; |
1879 | |
1880 | for (i = 0; i < sband->n_bitrates; i++) { |
1881 | struct ieee80211_rate *rate = &sband->bitrates[i]; |
1882 | |
1883 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
1884 | continue; |
1885 | |
1886 | for (j = 0; j < n_rates; j++) { |
1887 | if (rate->bitrate != bitrates[j]) |
1888 | continue; |
1889 | |
1890 | dest[j] = i; |
1891 | break; |
1892 | } |
1893 | } |
1894 | } |
1895 | |
1896 | static void |
1897 | minstrel_ht_init_cck_rates(struct minstrel_priv *mp) |
1898 | { |
1899 | static const s16 bitrates[4] = { 10, 20, 55, 110 }; |
1900 | struct ieee80211_supported_band *sband; |
1901 | u32 rate_flags = ieee80211_chandef_rate_flags(chandef: &mp->hw->conf.chandef); |
1902 | |
1903 | memset(mp->cck_rates, 0xff, sizeof(mp->cck_rates)); |
1904 | sband = mp->hw->wiphy->bands[NL80211_BAND_2GHZ]; |
1905 | if (!sband) |
1906 | return; |
1907 | |
1908 | BUILD_BUG_ON(ARRAY_SIZE(mp->cck_rates) != ARRAY_SIZE(bitrates)); |
1909 | minstrel_ht_fill_rate_array(dest: mp->cck_rates, sband, |
1910 | bitrates: minstrel_cck_bitrates, |
1911 | ARRAY_SIZE(minstrel_cck_bitrates), |
1912 | rate_flags); |
1913 | } |
1914 | |
1915 | static void |
1916 | minstrel_ht_init_ofdm_rates(struct minstrel_priv *mp, enum nl80211_band band) |
1917 | { |
1918 | static const s16 bitrates[8] = { 60, 90, 120, 180, 240, 360, 480, 540 }; |
1919 | struct ieee80211_supported_band *sband; |
1920 | u32 rate_flags = ieee80211_chandef_rate_flags(chandef: &mp->hw->conf.chandef); |
1921 | |
1922 | memset(mp->ofdm_rates[band], 0xff, sizeof(mp->ofdm_rates[band])); |
1923 | sband = mp->hw->wiphy->bands[band]; |
1924 | if (!sband) |
1925 | return; |
1926 | |
1927 | BUILD_BUG_ON(ARRAY_SIZE(mp->ofdm_rates[band]) != ARRAY_SIZE(bitrates)); |
1928 | minstrel_ht_fill_rate_array(dest: mp->ofdm_rates[band], sband, |
1929 | bitrates: minstrel_ofdm_bitrates, |
1930 | ARRAY_SIZE(minstrel_ofdm_bitrates), |
1931 | rate_flags); |
1932 | } |
1933 | |
1934 | static void * |
1935 | minstrel_ht_alloc(struct ieee80211_hw *hw) |
1936 | { |
1937 | struct minstrel_priv *mp; |
1938 | int i; |
1939 | |
1940 | mp = kzalloc(size: sizeof(struct minstrel_priv), GFP_ATOMIC); |
1941 | if (!mp) |
1942 | return NULL; |
1943 | |
1944 | /* contention window settings |
1945 | * Just an approximation. Using the per-queue values would complicate |
1946 | * the calculations and is probably unnecessary */ |
1947 | mp->cw_min = 15; |
1948 | mp->cw_max = 1023; |
1949 | |
1950 | /* maximum time that the hw is allowed to stay in one MRR segment */ |
1951 | mp->segment_size = 6000; |
1952 | |
1953 | if (hw->max_rate_tries > 0) |
1954 | mp->max_retry = hw->max_rate_tries; |
1955 | else |
1956 | /* safe default, does not necessarily have to match hw properties */ |
1957 | mp->max_retry = 7; |
1958 | |
1959 | mp->hw = hw; |
1960 | mp->update_interval = HZ / 20; |
1961 | |
1962 | minstrel_ht_init_cck_rates(mp); |
1963 | for (i = 0; i < ARRAY_SIZE(mp->hw->wiphy->bands); i++) |
1964 | minstrel_ht_init_ofdm_rates(mp, band: i); |
1965 | |
1966 | return mp; |
1967 | } |
1968 | |
1969 | #ifdef CONFIG_MAC80211_DEBUGFS |
1970 | static void minstrel_ht_add_debugfs(struct ieee80211_hw *hw, void *priv, |
1971 | struct dentry *debugfsdir) |
1972 | { |
1973 | struct minstrel_priv *mp = priv; |
1974 | |
1975 | mp->fixed_rate_idx = (u32) -1; |
1976 | debugfs_create_u32(name: "fixed_rate_idx" , S_IRUGO | S_IWUGO, parent: debugfsdir, |
1977 | value: &mp->fixed_rate_idx); |
1978 | } |
1979 | #endif |
1980 | |
1981 | static void |
1982 | minstrel_ht_free(void *priv) |
1983 | { |
1984 | kfree(objp: priv); |
1985 | } |
1986 | |
1987 | static u32 minstrel_ht_get_expected_throughput(void *priv_sta) |
1988 | { |
1989 | struct minstrel_ht_sta *mi = priv_sta; |
1990 | int i, j, prob, tp_avg; |
1991 | |
1992 | i = MI_RATE_GROUP(mi->max_tp_rate[0]); |
1993 | j = MI_RATE_IDX(mi->max_tp_rate[0]); |
1994 | prob = mi->groups[i].rates[j].prob_avg; |
1995 | |
1996 | /* convert tp_avg from pkt per second in kbps */ |
1997 | tp_avg = minstrel_ht_get_tp_avg(mi, group: i, rate: j, prob_avg: prob) * 10; |
1998 | tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024; |
1999 | |
2000 | return tp_avg; |
2001 | } |
2002 | |
2003 | static const struct rate_control_ops mac80211_minstrel_ht = { |
2004 | .name = "minstrel_ht" , |
2005 | .capa = RATE_CTRL_CAPA_AMPDU_TRIGGER, |
2006 | .tx_status_ext = minstrel_ht_tx_status, |
2007 | .get_rate = minstrel_ht_get_rate, |
2008 | .rate_init = minstrel_ht_rate_init, |
2009 | .rate_update = minstrel_ht_rate_update, |
2010 | .alloc_sta = minstrel_ht_alloc_sta, |
2011 | .free_sta = minstrel_ht_free_sta, |
2012 | .alloc = minstrel_ht_alloc, |
2013 | .free = minstrel_ht_free, |
2014 | #ifdef CONFIG_MAC80211_DEBUGFS |
2015 | .add_debugfs = minstrel_ht_add_debugfs, |
2016 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, |
2017 | #endif |
2018 | .get_expected_throughput = minstrel_ht_get_expected_throughput, |
2019 | }; |
2020 | |
2021 | |
2022 | static void __init init_sample_table(void) |
2023 | { |
2024 | int col, i, new_idx; |
2025 | u8 rnd[MCS_GROUP_RATES]; |
2026 | |
2027 | memset(sample_table, 0xff, sizeof(sample_table)); |
2028 | for (col = 0; col < SAMPLE_COLUMNS; col++) { |
2029 | get_random_bytes(buf: rnd, len: sizeof(rnd)); |
2030 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
2031 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
2032 | while (sample_table[col][new_idx] != 0xff) |
2033 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; |
2034 | |
2035 | sample_table[col][new_idx] = i; |
2036 | } |
2037 | } |
2038 | } |
2039 | |
2040 | int __init |
2041 | rc80211_minstrel_init(void) |
2042 | { |
2043 | init_sample_table(); |
2044 | return ieee80211_rate_control_register(ops: &mac80211_minstrel_ht); |
2045 | } |
2046 | |
2047 | void |
2048 | rc80211_minstrel_exit(void) |
2049 | { |
2050 | ieee80211_rate_control_unregister(ops: &mac80211_minstrel_ht); |
2051 | } |
2052 | |