1
2
3
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
13#define MCS_NBITS (AVG_PKT_SIZE << 3)
14
15
16
17
18#define MCS_N_KSYMS(bps) DIV_ROUND_UP(MCS_NBITS << 10, (bps))
19
20
21
22
23#define MCS_SYMBOL_TIME(sgi, ksyms) \
24 (sgi ? \
25 ((ksyms) * 4 * 18) / 20 : \
26 ((ksyms) * 4) \
27 )
28
29
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
37#define HE_GI_08 0
38#define HE_GI_16 1
39#define HE_GI_32 2
40
41
42#define HE_SYMBOL_TIME(gi, ksyms) \
43 (gi == HE_GI_08 ? \
44 ((ksyms) * 16 * 17) / 20 : \
45 (gi == HE_GI_16 ? \
46 ((ksyms) * 16 * 18) / 20 : \
47 ((ksyms) * 16) \
48 ))
49
50
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
64
65#define IEEE80211_MAX_STREAMS 4
66#define IEEE80211_HT_STREAM_GROUPS 4
67#define IEEE80211_VHT_STREAM_GROUPS 8
68
69#define IEEE80211_HE_MAX_STREAMS 8
70#define IEEE80211_HE_STREAM_GROUPS 12
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
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;
394 if (short_pre)
395 duration >>= 1;
396
397 duration += 10;
398 } else {
399 duration = 20 + 16;
400 }
401
402 len <<= 3;
403 duration += (len * 10) / bitrate;
404
405 return duration;
406}
407
408u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw,
409 struct ieee80211_rx_status *status,
410 int len)
411{
412 struct ieee80211_supported_band *sband;
413 const struct ieee80211_rate *rate;
414 bool sgi = status->enc_flags & RX_ENC_FLAG_SHORT_GI;
415 bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE;
416 int bw, streams;
417 int group, idx;
418 u32 duration;
419 bool cck;
420
421 switch (status->bw) {
422 case RATE_INFO_BW_20:
423 bw = BW_20;
424 break;
425 case RATE_INFO_BW_40:
426 bw = BW_40;
427 break;
428 case RATE_INFO_BW_80:
429 bw = BW_80;
430 break;
431 case RATE_INFO_BW_160:
432 bw = BW_160;
433 break;
434 default:
435 WARN_ON_ONCE(1);
436 return 0;
437 }
438
439 switch (status->encoding) {
440 case RX_ENC_LEGACY:
441 if (WARN_ON_ONCE(status->band > NL80211_BAND_5GHZ))
442 return 0;
443
444 sband = hw->wiphy->bands[status->band];
445 if (!sband || status->rate_idx >= sband->n_bitrates)
446 return 0;
447
448 rate = &sband->bitrates[status->rate_idx];
449 cck = rate->flags & IEEE80211_RATE_MANDATORY_B;
450
451 return ieee80211_calc_legacy_rate_duration(rate->bitrate, sp,
452 cck, len);
453
454 case RX_ENC_VHT:
455 streams = status->nss;
456 idx = status->rate_idx;
457 group = VHT_GROUP_IDX(streams, sgi, bw);
458 break;
459 case RX_ENC_HT:
460 streams = ((status->rate_idx >> 3) & 3) + 1;
461 idx = status->rate_idx & 7;
462 group = HT_GROUP_IDX(streams, sgi, bw);
463 break;
464 case RX_ENC_HE:
465 streams = status->nss;
466 idx = status->rate_idx;
467 group = HE_GROUP_IDX(streams, status->he_gi, bw);
468 break;
469 default:
470 WARN_ON_ONCE(1);
471 return 0;
472 }
473
474 if (WARN_ON_ONCE((status->encoding != RX_ENC_HE && streams > 4) ||
475 (status->encoding == RX_ENC_HE && streams > 8)))
476 return 0;
477
478 duration = airtime_mcs_groups[group].duration[idx];
479 duration <<= airtime_mcs_groups[group].shift;
480 duration *= len;
481 duration /= AVG_PKT_SIZE;
482 duration /= 1024;
483
484 duration += 36 + (streams << 2);
485
486 return duration;
487}
488EXPORT_SYMBOL_GPL(ieee80211_calc_rx_airtime);
489
490static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw,
491 struct ieee80211_tx_rate *rate,
492 u8 band, int len)
493{
494 struct ieee80211_rx_status stat = {
495 .band = band,
496 };
497
498 if (rate->idx < 0 || !rate->count)
499 return 0;
500
501 if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
502 stat.bw = RATE_INFO_BW_80;
503 else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
504 stat.bw = RATE_INFO_BW_40;
505 else
506 stat.bw = RATE_INFO_BW_20;
507
508 stat.enc_flags = 0;
509 if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
510 stat.enc_flags |= RX_ENC_FLAG_SHORTPRE;
511 if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
512 stat.enc_flags |= RX_ENC_FLAG_SHORT_GI;
513
514 stat.rate_idx = rate->idx;
515 if (rate->flags & IEEE80211_TX_RC_VHT_MCS) {
516 stat.encoding = RX_ENC_VHT;
517 stat.rate_idx = ieee80211_rate_get_vht_mcs(rate);
518 stat.nss = ieee80211_rate_get_vht_nss(rate);
519 } else if (rate->flags & IEEE80211_TX_RC_MCS) {
520 stat.encoding = RX_ENC_HT;
521 } else {
522 stat.encoding = RX_ENC_LEGACY;
523 }
524
525 return ieee80211_calc_rx_airtime(hw, &stat, len);
526}
527
528u32 ieee80211_calc_tx_airtime(struct ieee80211_hw *hw,
529 struct ieee80211_tx_info *info,
530 int len)
531{
532 u32 duration = 0;
533 int i;
534
535 for (i = 0; i < ARRAY_SIZE(info->status.rates); i++) {
536 struct ieee80211_tx_rate *rate = &info->status.rates[i];
537 u32 cur_duration;
538
539 cur_duration = ieee80211_calc_tx_airtime_rate(hw, rate,
540 info->band, len);
541 if (!cur_duration)
542 break;
543
544 duration += cur_duration * rate->count;
545 }
546
547 return duration;
548}
549EXPORT_SYMBOL_GPL(ieee80211_calc_tx_airtime);
550
551u32 ieee80211_calc_expected_tx_airtime(struct ieee80211_hw *hw,
552 struct ieee80211_vif *vif,
553 struct ieee80211_sta *pubsta,
554 int len)
555{
556 struct ieee80211_supported_band *sband;
557 struct ieee80211_chanctx_conf *conf;
558 int rateidx, shift = 0;
559 bool cck, short_pream;
560 u32 basic_rates;
561 u8 band = 0;
562 u16 rate;
563
564 len += 38;
565
566 conf = rcu_dereference(vif->chanctx_conf);
567 if (conf) {
568 band = conf->def.chan->band;
569 shift = ieee80211_chandef_get_shift(&conf->def);
570 }
571
572 if (pubsta) {
573 struct sta_info *sta = container_of(pubsta, struct sta_info,
574 sta);
575
576 return ieee80211_calc_tx_airtime_rate(hw,
577 &sta->tx_stats.last_rate,
578 band, len);
579 }
580
581 if (!conf)
582 return 0;
583
584
585
586
587 sband = hw->wiphy->bands[band];
588
589 basic_rates = vif->bss_conf.basic_rates;
590 short_pream = vif->bss_conf.use_short_preamble;
591
592 rateidx = basic_rates ? ffs(basic_rates) - 1 : 0;
593 rate = sband->bitrates[rateidx].bitrate << shift;
594 cck = sband->bitrates[rateidx].flags & IEEE80211_RATE_MANDATORY_B;
595
596 return ieee80211_calc_legacy_rate_duration(rate, short_pream, cck, len);
597}
598
