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1// SPDX-License-Identifier: ISC
2/*
3 * Copyright (C) 2019 Felix Fietkau <nbd@nbd.name>
4 */
5
6#include <net/mac80211.h>
7#include "ieee80211_i.h"
8#include "sta_info.h"
9
10#define AVG_PKT_SIZE 1024
11
12/* Number of bits for an average sized packet */
13#define MCS_NBITS (AVG_PKT_SIZE << 3)
14
15/* Number of kilo-symbols (symbols * 1024) for a packet with (bps) bits per
16 * symbol. We use k-symbols to avoid rounding in the _TIME macros below.
17 */
18#define MCS_N_KSYMS(bps) DIV_ROUND_UP(MCS_NBITS << 10, (bps))
19
20/* Transmission time (in 1024 * usec) for a packet containing (ksyms) * 1024
21 * symbols.
22 */
23#define MCS_SYMBOL_TIME(sgi, ksyms) \
24 (sgi ? \
25 ((ksyms) * 4 * 18) / 20 : /* 3.6 us per sym */ \
26 ((ksyms) * 4) /* 4.0 us per sym */ \
27 )
28
29/* Transmit duration for the raw data part of an average sized packet */
30#define MCS_DURATION(streams, sgi, bps) \
31 ((u32)MCS_SYMBOL_TIME(sgi, MCS_N_KSYMS((streams) * (bps))))
32
33#define MCS_DURATION_S(shift, streams, sgi, bps) \
34 ((u16)((MCS_DURATION(streams, sgi, bps) >> shift)))
35
36/* These should match the values in enum nl80211_he_gi */
37#define HE_GI_08 0
38#define HE_GI_16 1
39#define HE_GI_32 2
40
41/* Transmission time (1024 usec) for a packet containing (ksyms) * k-symbols */
42#define HE_SYMBOL_TIME(gi, ksyms) \
43 (gi == HE_GI_08 ? \
44 ((ksyms) * 16 * 17) / 20 : /* 13.6 us per sym */ \
45 (gi == HE_GI_16 ? \
46 ((ksyms) * 16 * 18) / 20 : /* 14.4 us per sym */ \
47 ((ksyms) * 16) /* 16.0 us per sym */ \
48 ))
49
50/* Transmit duration for the raw data part of an average sized packet */
51#define HE_DURATION(streams, gi, bps) \
52 ((u32)HE_SYMBOL_TIME(gi, MCS_N_KSYMS((streams) * (bps))))
53
54#define HE_DURATION_S(shift, streams, gi, bps) \
55 (HE_DURATION(streams, gi, bps) >> shift)
56
57#define BW_20 0
58#define BW_40 1
59#define BW_80 2
60#define BW_160 3
61
62/*
63 * Define group sort order: HT40 -> SGI -> #streams
64 */
65#define IEEE80211_MAX_STREAMS 4
66#define IEEE80211_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */
67#define IEEE80211_VHT_STREAM_GROUPS 8 /* BW(=4) * SGI(=2) */
68
69#define IEEE80211_HE_MAX_STREAMS 8
70#define IEEE80211_HE_STREAM_GROUPS 12 /* BW(=4) * GI(=3) */
71
72#define IEEE80211_HT_GROUPS_NB (IEEE80211_MAX_STREAMS * \
73 IEEE80211_HT_STREAM_GROUPS)
74#define IEEE80211_VHT_GROUPS_NB (IEEE80211_MAX_STREAMS * \
75 IEEE80211_VHT_STREAM_GROUPS)
76#define IEEE80211_HE_GROUPS_NB (IEEE80211_HE_MAX_STREAMS * \
77 IEEE80211_HE_STREAM_GROUPS)
78#define IEEE80211_GROUPS_NB (IEEE80211_HT_GROUPS_NB + \
79 IEEE80211_VHT_GROUPS_NB + \
80 IEEE80211_HE_GROUPS_NB)
81
82#define IEEE80211_HT_GROUP_0 0
83#define IEEE80211_VHT_GROUP_0 (IEEE80211_HT_GROUP_0 + IEEE80211_HT_GROUPS_NB)
84#define IEEE80211_HE_GROUP_0 (IEEE80211_VHT_GROUP_0 + IEEE80211_VHT_GROUPS_NB)
85
86#define MCS_GROUP_RATES 12
87
88#define HT_GROUP_IDX(_streams, _sgi, _ht40) \
89 IEEE80211_HT_GROUP_0 + \
90 IEEE80211_MAX_STREAMS * 2 * _ht40 + \
91 IEEE80211_MAX_STREAMS * _sgi + \
92 _streams - 1
93
94#define _MAX(a, b) (((a)>(b))?(a):(b))
95
96#define GROUP_SHIFT(duration) \
97 _MAX(0, 16 - __builtin_clz(duration))
98
99/* MCS rate information for an MCS group */
100#define __MCS_GROUP(_streams, _sgi, _ht40, _s) \
101 [HT_GROUP_IDX(_streams, _sgi, _ht40)] = { \
102 .shift = _s, \
103 .duration = { \
104 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 54 : 26), \
105 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 108 : 52), \
106 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 162 : 78), \
107 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 216 : 104), \
108 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 324 : 156), \
109 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 432 : 208), \
110 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 486 : 234), \
111 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 540 : 260) \
112 } \
113}
114
115#define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \
116 GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26))
117
118#define MCS_GROUP(_streams, _sgi, _ht40) \
119 __MCS_GROUP(_streams, _sgi, _ht40, \
120 MCS_GROUP_SHIFT(_streams, _sgi, _ht40))
121
122#define VHT_GROUP_IDX(_streams, _sgi, _bw) \
123 (IEEE80211_VHT_GROUP_0 + \
124 IEEE80211_MAX_STREAMS * 2 * (_bw) + \
125 IEEE80211_MAX_STREAMS * (_sgi) + \
126 (_streams) - 1)
127
128#define BW2VBPS(_bw, r4, r3, r2, r1) \
129 (_bw == BW_160 ? r4 : _bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1)
130
131#define __VHT_GROUP(_streams, _sgi, _bw, _s) \
132 [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
133 .shift = _s, \
134 .duration = { \
135 MCS_DURATION_S(_s, _streams, _sgi, \
136 BW2VBPS(_bw, 234, 117, 54, 26)), \
137 MCS_DURATION_S(_s, _streams, _sgi, \
138 BW2VBPS(_bw, 468, 234, 108, 52)), \
139 MCS_DURATION_S(_s, _streams, _sgi, \
140 BW2VBPS(_bw, 702, 351, 162, 78)), \
141 MCS_DURATION_S(_s, _streams, _sgi, \
142 BW2VBPS(_bw, 936, 468, 216, 104)), \
143 MCS_DURATION_S(_s, _streams, _sgi, \
144 BW2VBPS(_bw, 1404, 702, 324, 156)), \
145 MCS_DURATION_S(_s, _streams, _sgi, \
146 BW2VBPS(_bw, 1872, 936, 432, 208)), \
147 MCS_DURATION_S(_s, _streams, _sgi, \
148 BW2VBPS(_bw, 2106, 1053, 486, 234)), \
149 MCS_DURATION_S(_s, _streams, _sgi, \
150 BW2VBPS(_bw, 2340, 1170, 540, 260)), \
151 MCS_DURATION_S(_s, _streams, _sgi, \
152 BW2VBPS(_bw, 2808, 1404, 648, 312)), \
153 MCS_DURATION_S(_s, _streams, _sgi, \
154 BW2VBPS(_bw, 3120, 1560, 720, 346)) \
155 } \
156}
157
158#define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \
159 GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \
160 BW2VBPS(_bw, 243, 117, 54, 26)))
161
162#define VHT_GROUP(_streams, _sgi, _bw) \
163 __VHT_GROUP(_streams, _sgi, _bw, \
164 VHT_GROUP_SHIFT(_streams, _sgi, _bw))
165
166
167#define HE_GROUP_IDX(_streams, _gi, _bw) \
168 (IEEE80211_HE_GROUP_0 + \
169 IEEE80211_HE_MAX_STREAMS * 3 * (_bw) + \
170 IEEE80211_HE_MAX_STREAMS * (_gi) + \
171 (_streams) - 1)
172
173#define __HE_GROUP(_streams, _gi, _bw, _s) \
174 [HE_GROUP_IDX(_streams, _gi, _bw)] = { \
175 .shift = _s, \
176 .duration = { \
177 HE_DURATION_S(_s, _streams, _gi, \
178 BW2VBPS(_bw, 979, 489, 230, 115)), \
179 HE_DURATION_S(_s, _streams, _gi, \
180 BW2VBPS(_bw, 1958, 979, 475, 230)), \
181 HE_DURATION_S(_s, _streams, _gi, \
182 BW2VBPS(_bw, 2937, 1468, 705, 345)), \
183 HE_DURATION_S(_s, _streams, _gi, \
184 BW2VBPS(_bw, 3916, 1958, 936, 475)), \
185 HE_DURATION_S(_s, _streams, _gi, \
186 BW2VBPS(_bw, 5875, 2937, 1411, 705)), \
187 HE_DURATION_S(_s, _streams, _gi, \
188 BW2VBPS(_bw, 7833, 3916, 1872, 936)), \
189 HE_DURATION_S(_s, _streams, _gi, \
190 BW2VBPS(_bw, 8827, 4406, 2102, 1051)), \
191 HE_DURATION_S(_s, _streams, _gi, \
192 BW2VBPS(_bw, 9806, 4896, 2347, 1166)), \
193 HE_DURATION_S(_s, _streams, _gi, \
194 BW2VBPS(_bw, 11764, 5875, 2808, 1411)), \
195 HE_DURATION_S(_s, _streams, _gi, \
196 BW2VBPS(_bw, 13060, 6523, 3124, 1555)), \
197 HE_DURATION_S(_s, _streams, _gi, \
198 BW2VBPS(_bw, 14702, 7344, 3513, 1756)), \
199 HE_DURATION_S(_s, _streams, _gi, \
200 BW2VBPS(_bw, 16329, 8164, 3902, 1944)) \
201 } \
202}
203
204#define HE_GROUP_SHIFT(_streams, _gi, _bw) \
205 GROUP_SHIFT(HE_DURATION(_streams, _gi, \
206 BW2VBPS(_bw, 979, 489, 230, 115)))
207
208#define HE_GROUP(_streams, _gi, _bw) \
209 __HE_GROUP(_streams, _gi, _bw, \
210 HE_GROUP_SHIFT(_streams, _gi, _bw))
211struct mcs_group {
212 u8 shift;
213 u16 duration[MCS_GROUP_RATES];
214};
215
216static const struct mcs_group airtime_mcs_groups[] = {
217 MCS_GROUP(1, 0, BW_20),
218 MCS_GROUP(2, 0, BW_20),
219 MCS_GROUP(3, 0, BW_20),
220 MCS_GROUP(4, 0, BW_20),
221
222 MCS_GROUP(1, 1, BW_20),
223 MCS_GROUP(2, 1, BW_20),
224 MCS_GROUP(3, 1, BW_20),
225 MCS_GROUP(4, 1, BW_20),
226
227 MCS_GROUP(1, 0, BW_40),
228 MCS_GROUP(2, 0, BW_40),
229 MCS_GROUP(3, 0, BW_40),
230 MCS_GROUP(4, 0, BW_40),
231
232 MCS_GROUP(1, 1, BW_40),
233 MCS_GROUP(2, 1, BW_40),
234 MCS_GROUP(3, 1, BW_40),
235 MCS_GROUP(4, 1, BW_40),
236
237 VHT_GROUP(1, 0, BW_20),
238 VHT_GROUP(2, 0, BW_20),
239 VHT_GROUP(3, 0, BW_20),
240 VHT_GROUP(4, 0, BW_20),
241
242 VHT_GROUP(1, 1, BW_20),
243 VHT_GROUP(2, 1, BW_20),
244 VHT_GROUP(3, 1, BW_20),
245 VHT_GROUP(4, 1, BW_20),
246
247 VHT_GROUP(1, 0, BW_40),
248 VHT_GROUP(2, 0, BW_40),
249 VHT_GROUP(3, 0, BW_40),
250 VHT_GROUP(4, 0, BW_40),
251
252 VHT_GROUP(1, 1, BW_40),
253 VHT_GROUP(2, 1, BW_40),
254 VHT_GROUP(3, 1, BW_40),
255 VHT_GROUP(4, 1, BW_40),
256
257 VHT_GROUP(1, 0, BW_80),
258 VHT_GROUP(2, 0, BW_80),
259 VHT_GROUP(3, 0, BW_80),
260 VHT_GROUP(4, 0, BW_80),
261
262 VHT_GROUP(1, 1, BW_80),
263 VHT_GROUP(2, 1, BW_80),
264 VHT_GROUP(3, 1, BW_80),
265 VHT_GROUP(4, 1, BW_80),
266
267 VHT_GROUP(1, 0, BW_160),
268 VHT_GROUP(2, 0, BW_160),
269 VHT_GROUP(3, 0, BW_160),
270 VHT_GROUP(4, 0, BW_160),
271
272 VHT_GROUP(1, 1, BW_160),
273 VHT_GROUP(2, 1, BW_160),
274 VHT_GROUP(3, 1, BW_160),
275 VHT_GROUP(4, 1, BW_160),
276
277 HE_GROUP(1, HE_GI_08, BW_20),
278 HE_GROUP(2, HE_GI_08, BW_20),
279 HE_GROUP(3, HE_GI_08, BW_20),
280 HE_GROUP(4, HE_GI_08, BW_20),
281 HE_GROUP(5, HE_GI_08, BW_20),
282 HE_GROUP(6, HE_GI_08, BW_20),
283 HE_GROUP(7, HE_GI_08, BW_20),
284 HE_GROUP(8, HE_GI_08, BW_20),
285
286 HE_GROUP(1, HE_GI_16, BW_20),
287 HE_GROUP(2, HE_GI_16, BW_20),
288 HE_GROUP(3, HE_GI_16, BW_20),
289 HE_GROUP(4, HE_GI_16, BW_20),
290 HE_GROUP(5, HE_GI_16, BW_20),
291 HE_GROUP(6, HE_GI_16, BW_20),
292 HE_GROUP(7, HE_GI_16, BW_20),
293 HE_GROUP(8, HE_GI_16, BW_20),
294
295 HE_GROUP(1, HE_GI_32, BW_20),
296 HE_GROUP(2, HE_GI_32, BW_20),
297 HE_GROUP(3, HE_GI_32, BW_20),
298 HE_GROUP(4, HE_GI_32, BW_20),
299 HE_GROUP(5, HE_GI_32, BW_20),
300 HE_GROUP(6, HE_GI_32, BW_20),
301 HE_GROUP(7, HE_GI_32, BW_20),
302 HE_GROUP(8, HE_GI_32, BW_20),
303
304 HE_GROUP(1, HE_GI_08, BW_40),
305 HE_GROUP(2, HE_GI_08, BW_40),
306 HE_GROUP(3, HE_GI_08, BW_40),
307 HE_GROUP(4, HE_GI_08, BW_40),
308 HE_GROUP(5, HE_GI_08, BW_40),
309 HE_GROUP(6, HE_GI_08, BW_40),
310 HE_GROUP(7, HE_GI_08, BW_40),
311 HE_GROUP(8, HE_GI_08, BW_40),
312
313 HE_GROUP(1, HE_GI_16, BW_40),
314 HE_GROUP(2, HE_GI_16, BW_40),
315 HE_GROUP(3, HE_GI_16, BW_40),
316 HE_GROUP(4, HE_GI_16, BW_40),
317 HE_GROUP(5, HE_GI_16, BW_40),
318 HE_GROUP(6, HE_GI_16, BW_40),
319 HE_GROUP(7, HE_GI_16, BW_40),
320 HE_GROUP(8, HE_GI_16, BW_40),
321
322 HE_GROUP(1, HE_GI_32, BW_40),
323 HE_GROUP(2, HE_GI_32, BW_40),
324 HE_GROUP(3, HE_GI_32, BW_40),
325 HE_GROUP(4, HE_GI_32, BW_40),
326 HE_GROUP(5, HE_GI_32, BW_40),
327 HE_GROUP(6, HE_GI_32, BW_40),
328 HE_GROUP(7, HE_GI_32, BW_40),
329 HE_GROUP(8, HE_GI_32, BW_40),
330
331 HE_GROUP(1, HE_GI_08, BW_80),
332 HE_GROUP(2, HE_GI_08, BW_80),
333 HE_GROUP(3, HE_GI_08, BW_80),
334 HE_GROUP(4, HE_GI_08, BW_80),
335 HE_GROUP(5, HE_GI_08, BW_80),
336 HE_GROUP(6, HE_GI_08, BW_80),
337 HE_GROUP(7, HE_GI_08, BW_80),
338 HE_GROUP(8, HE_GI_08, BW_80),
339
340 HE_GROUP(1, HE_GI_16, BW_80),
341 HE_GROUP(2, HE_GI_16, BW_80),
342 HE_GROUP(3, HE_GI_16, BW_80),
343 HE_GROUP(4, HE_GI_16, BW_80),
344 HE_GROUP(5, HE_GI_16, BW_80),
345 HE_GROUP(6, HE_GI_16, BW_80),
346 HE_GROUP(7, HE_GI_16, BW_80),
347 HE_GROUP(8, HE_GI_16, BW_80),
348
349 HE_GROUP(1, HE_GI_32, BW_80),
350 HE_GROUP(2, HE_GI_32, BW_80),
351 HE_GROUP(3, HE_GI_32, BW_80),
352 HE_GROUP(4, HE_GI_32, BW_80),
353 HE_GROUP(5, HE_GI_32, BW_80),
354 HE_GROUP(6, HE_GI_32, BW_80),
355 HE_GROUP(7, HE_GI_32, BW_80),
356 HE_GROUP(8, HE_GI_32, BW_80),
357
358 HE_GROUP(1, HE_GI_08, BW_160),
359 HE_GROUP(2, HE_GI_08, BW_160),
360 HE_GROUP(3, HE_GI_08, BW_160),
361 HE_GROUP(4, HE_GI_08, BW_160),
362 HE_GROUP(5, HE_GI_08, BW_160),
363 HE_GROUP(6, HE_GI_08, BW_160),
364 HE_GROUP(7, HE_GI_08, BW_160),
365 HE_GROUP(8, HE_GI_08, BW_160),
366
367 HE_GROUP(1, HE_GI_16, BW_160),
368 HE_GROUP(2, HE_GI_16, BW_160),
369 HE_GROUP(3, HE_GI_16, BW_160),
370 HE_GROUP(4, HE_GI_16, BW_160),
371 HE_GROUP(5, HE_GI_16, BW_160),
372 HE_GROUP(6, HE_GI_16, BW_160),
373 HE_GROUP(7, HE_GI_16, BW_160),
374 HE_GROUP(8, HE_GI_16, BW_160),
375
376 HE_GROUP(1, HE_GI_32, BW_160),
377 HE_GROUP(2, HE_GI_32, BW_160),
378 HE_GROUP(3, HE_GI_32, BW_160),
379 HE_GROUP(4, HE_GI_32, BW_160),
380 HE_GROUP(5, HE_GI_32, BW_160),
381 HE_GROUP(6, HE_GI_32, BW_160),
382 HE_GROUP(7, HE_GI_32, BW_160),
383 HE_GROUP(8, HE_GI_32, BW_160),
384};
385
386static u32
387ieee80211_calc_legacy_rate_duration(u16 bitrate, bool short_pre,
388 bool cck, int len)
389{
390 u32 duration;
391
392 if (cck) {
393 duration = 144 + 48; /* preamble + PLCP */
394 if (short_pre)
395 duration >>= 1;
396
397 duration += 10; /* SIFS */
398 } else {
399 duration = 20 + 16; /* premable + SIFS */
400 }
401
402 len <<= 3;
403 duration += (len * 10) / bitrate;
404
405 return duration;
406}
407
408static u32 ieee80211_get_rate_duration(struct ieee80211_hw *hw,
409 struct ieee80211_rx_status *status,
410 u32 *overhead)
411{
412 bool sgi = status->enc_flags & RX_ENC_FLAG_SHORT_GI;
413 int bw, streams;
414 int group, idx;
415 u32 duration;
416
417 switch (status->bw) {
418 case RATE_INFO_BW_20:
419 bw = BW_20;
420 break;
421 case RATE_INFO_BW_40:
422 bw = BW_40;
423 break;
424 case RATE_INFO_BW_80:
425 bw = BW_80;
426 break;
427 case RATE_INFO_BW_160:
428 bw = BW_160;
429 break;
430 default:
431 WARN_ON_ONCE(1);
432 return 0;
433 }
434
435 switch (status->encoding) {
436 case RX_ENC_VHT:
437 streams = status->nss;
438 idx = status->rate_idx;
439 group = VHT_GROUP_IDX(streams, sgi, bw);
440 break;
441 case RX_ENC_HT:
442 streams = ((status->rate_idx >> 3) & 3) + 1;
443 idx = status->rate_idx & 7;
444 group = HT_GROUP_IDX(streams, sgi, bw);
445 break;
446 case RX_ENC_HE:
447 streams = status->nss;
448 idx = status->rate_idx;
449 group = HE_GROUP_IDX(streams, status->he_gi, bw);
450 break;
451 default:
452 WARN_ON_ONCE(1);
453 return 0;
454 }
455
456 if (WARN_ON_ONCE((status->encoding != RX_ENC_HE && streams > 4) ||
457 (status->encoding == RX_ENC_HE && streams > 8)))
458 return 0;
459
460 duration = airtime_mcs_groups[group].duration[idx];
461 duration <<= airtime_mcs_groups[group].shift;
462 *overhead = 36 + (streams << 2);
463
464 return duration;
465}
466
467
468u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw,
469 struct ieee80211_rx_status *status,
470 int len)
471{
472 struct ieee80211_supported_band *sband;
473 u32 duration, overhead = 0;
474
475 if (status->encoding == RX_ENC_LEGACY) {
476 const struct ieee80211_rate *rate;
477 bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE;
478 bool cck;
479
480 if (WARN_ON_ONCE(status->band > NL80211_BAND_5GHZ))
481 return 0;
482
483 sband = hw->wiphy->bands[status->band];
484 if (!sband || status->rate_idx >= sband->n_bitrates)
485 return 0;
486
487 rate = &sband->bitrates[status->rate_idx];
488 cck = rate->flags & IEEE80211_RATE_MANDATORY_B;
489
490 return ieee80211_calc_legacy_rate_duration(rate->bitrate, sp,
491 cck, len);
492 }
493
494 duration = ieee80211_get_rate_duration(hw, status, &overhead);
495 if (!duration)
496 return 0;
497
498 duration *= len;
499 duration /= AVG_PKT_SIZE;
500 duration /= 1024;
501
502 return duration + overhead;
503}
504EXPORT_SYMBOL_GPL(ieee80211_calc_rx_airtime);
505
506static bool ieee80211_fill_rate_info(struct ieee80211_hw *hw,
507 struct ieee80211_rx_status *stat, u8 band,
508 struct rate_info *ri)
509{
510 struct ieee80211_supported_band *sband = hw->wiphy->bands[band];
511 int i;
512
513 if (!ri || !sband)
514 return false;
515
516 stat->bw = ri->bw;
517 stat->nss = ri->nss;
518 stat->rate_idx = ri->mcs;
519
520 if (ri->flags & RATE_INFO_FLAGS_HE_MCS)
521 stat->encoding = RX_ENC_HE;
522 else if (ri->flags & RATE_INFO_FLAGS_VHT_MCS)
523 stat->encoding = RX_ENC_VHT;
524 else if (ri->flags & RATE_INFO_FLAGS_MCS)
525 stat->encoding = RX_ENC_HT;
526 else
527 stat->encoding = RX_ENC_LEGACY;
528
529 if (ri->flags & RATE_INFO_FLAGS_SHORT_GI)
530 stat->enc_flags |= RX_ENC_FLAG_SHORT_GI;
531
532 stat->he_gi = ri->he_gi;
533
534 if (stat->encoding != RX_ENC_LEGACY)
535 return true;
536
537 stat->rate_idx = 0;
538 for (i = 0; i < sband->n_bitrates; i++) {
539 if (ri->legacy != sband->bitrates[i].bitrate)
540 continue;
541
542 stat->rate_idx = i;
543 return true;
544 }
545
546 return false;
547}
548
549static int ieee80211_fill_rx_status(struct ieee80211_rx_status *stat,
550 struct ieee80211_hw *hw,
551 struct ieee80211_tx_rate *rate,
552 struct rate_info *ri, u8 band, int len)
553{
554 memset(stat, 0, sizeof(*stat));
555 stat->band = band;
556
557 if (ieee80211_fill_rate_info(hw, stat, band, ri))
558 return 0;
559
560 if (rate->idx < 0 || !rate->count)
561 return -1;
562
563 if (rate->flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
564 stat->bw = RATE_INFO_BW_160;
565 else if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
566 stat->bw = RATE_INFO_BW_80;
567 else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
568 stat->bw = RATE_INFO_BW_40;
569 else
570 stat->bw = RATE_INFO_BW_20;
571
572 stat->enc_flags = 0;
573 if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
574 stat->enc_flags |= RX_ENC_FLAG_SHORTPRE;
575 if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
576 stat->enc_flags |= RX_ENC_FLAG_SHORT_GI;
577
578 stat->rate_idx = rate->idx;
579 if (rate->flags & IEEE80211_TX_RC_VHT_MCS) {
580 stat->encoding = RX_ENC_VHT;
581 stat->rate_idx = ieee80211_rate_get_vht_mcs(rate);
582 stat->nss = ieee80211_rate_get_vht_nss(rate);
583 } else if (rate->flags & IEEE80211_TX_RC_MCS) {
584 stat->encoding = RX_ENC_HT;
585 } else {
586 stat->encoding = RX_ENC_LEGACY;
587 }
588
589 return 0;
590}
591
592static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw,
593 struct ieee80211_tx_rate *rate,
594 struct rate_info *ri,
595 u8 band, int len)
596{
597 struct ieee80211_rx_status stat;
598
599 if (ieee80211_fill_rx_status(&stat, hw, rate, ri, band, len))
600 return 0;
601
602 return ieee80211_calc_rx_airtime(hw, &stat, len);
603}
604
605u32 ieee80211_calc_tx_airtime(struct ieee80211_hw *hw,
606 struct ieee80211_tx_info *info,
607 int len)
608{
609 u32 duration = 0;
610 int i;
611
612 for (i = 0; i < ARRAY_SIZE(info->status.rates); i++) {
613 struct ieee80211_tx_rate *rate = &info->status.rates[i];
614 u32 cur_duration;
615
616 cur_duration = ieee80211_calc_tx_airtime_rate(hw, rate, NULL,
617 info->band, len);
618 if (!cur_duration)
619 break;
620
621 duration += cur_duration * rate->count;
622 }
623
624 return duration;
625}
626EXPORT_SYMBOL_GPL(ieee80211_calc_tx_airtime);
627
628u32 ieee80211_calc_expected_tx_airtime(struct ieee80211_hw *hw,
629 struct ieee80211_vif *vif,
630 struct ieee80211_sta *pubsta,
631 int len, bool ampdu)
632{
633 struct ieee80211_supported_band *sband;
634 struct ieee80211_chanctx_conf *conf;
635 int rateidx, shift = 0;
636 bool cck, short_pream;
637 u32 basic_rates;
638 u8 band = 0;
639 u16 rate;
640
641 len += 38; /* Ethernet header length */
642
643 conf = rcu_dereference(vif->chanctx_conf);
644 if (conf) {
645 band = conf->def.chan->band;
646 shift = ieee80211_chandef_get_shift(&conf->def);
647 }
648
649 if (pubsta) {
650 struct sta_info *sta = container_of(pubsta, struct sta_info,
651 sta);
652 struct ieee80211_rx_status stat;
653 struct ieee80211_tx_rate *rate = &sta->tx_stats.last_rate;
654 struct rate_info *ri = &sta->tx_stats.last_rate_info;
655 u32 duration, overhead;
656 u8 agg_shift;
657
658 if (ieee80211_fill_rx_status(&stat, hw, rate, ri, band, len))
659 return 0;
660
661 if (stat.encoding == RX_ENC_LEGACY || !ampdu)
662 return ieee80211_calc_rx_airtime(hw, &stat, len);
663
664 duration = ieee80211_get_rate_duration(hw, &stat, &overhead);
665 /*
666 * Assume that HT/VHT transmission on any AC except VO will
667 * use aggregation. Since we don't have reliable reporting
668 * of aggregation length, assume an average size based on the
669 * tx rate.
670 * This will not be very accurate, but much better than simply
671 * assuming un-aggregated tx in all cases.
672 */
673 if (duration > 400 * 1024) /* <= VHT20 MCS2 1S */
674 agg_shift = 1;
675 else if (duration > 250 * 1024) /* <= VHT20 MCS3 1S or MCS1 2S */
676 agg_shift = 2;
677 else if (duration > 150 * 1024) /* <= VHT20 MCS5 1S or MCS2 2S */
678 agg_shift = 3;
679 else if (duration > 70 * 1024) /* <= VHT20 MCS5 2S */
680 agg_shift = 4;
681 else if (stat.encoding != RX_ENC_HE ||
682 duration > 20 * 1024) /* <= HE40 MCS6 2S */
683 agg_shift = 5;
684 else
685 agg_shift = 6;
686
687 duration *= len;
688 duration /= AVG_PKT_SIZE;
689 duration /= 1024;
690 duration += (overhead >> agg_shift);
691
692 return max_t(u32, duration, 4);
693 }
694
695 if (!conf)
696 return 0;
697
698 /* No station to get latest rate from, so calculate the worst-case
699 * duration using the lowest configured basic rate.
700 */
701 sband = hw->wiphy->bands[band];
702
703 basic_rates = vif->bss_conf.basic_rates;
704 short_pream = vif->bss_conf.use_short_preamble;
705
706 rateidx = basic_rates ? ffs(basic_rates) - 1 : 0;
707 rate = sband->bitrates[rateidx].bitrate << shift;
708 cck = sband->bitrates[rateidx].flags & IEEE80211_RATE_MANDATORY_B;
709
710 return ieee80211_calc_legacy_rate_duration(rate, short_pream, cck, len);
711}