1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (C) 2019 Felix Fietkau <nbd@nbd.name>
4 * Copyright (C) 2021-2022 Intel Corporation
5 */
6
7 #include <net/mac80211.h>
8 #include "ieee80211_i.h"
9 #include "sta_info.h"
10
11 #define AVG_PKT_SIZE 1024
12
13 /* Number of bits for an average sized packet */
14 #define MCS_NBITS (AVG_PKT_SIZE << 3)
15
16 /* Number of kilo-symbols (symbols * 1024) for a packet with (bps) bits per
17 * symbol. We use k-symbols to avoid rounding in the _TIME macros below.
18 */
19 #define MCS_N_KSYMS(bps) DIV_ROUND_UP(MCS_NBITS << 10, (bps))
20
21 /* Transmission time (in 1024 * usec) for a packet containing (ksyms) * 1024
22 * symbols.
23 */
24 #define MCS_SYMBOL_TIME(sgi, ksyms) \
25 (sgi ? \
26 ((ksyms) * 4 * 18) / 20 : /* 3.6 us per sym */ \
27 ((ksyms) * 4) /* 4.0 us per sym */ \
28 )
29
30 /* Transmit duration for the raw data part of an average sized packet */
31 #define MCS_DURATION(streams, sgi, bps) \
32 ((u32)MCS_SYMBOL_TIME(sgi, MCS_N_KSYMS((streams) * (bps))))
33
34 #define MCS_DURATION_S(shift, streams, sgi, bps) \
35 ((u16)((MCS_DURATION(streams, sgi, bps) >> shift)))
36
37 /* These should match the values in enum nl80211_he_gi */
38 #define HE_GI_08 0
39 #define HE_GI_16 1
40 #define HE_GI_32 2
41
42 /* Transmission time (1024 usec) for a packet containing (ksyms) * k-symbols */
43 #define HE_SYMBOL_TIME(gi, ksyms) \
44 (gi == HE_GI_08 ? \
45 ((ksyms) * 16 * 17) / 20 : /* 13.6 us per sym */ \
46 (gi == HE_GI_16 ? \
47 ((ksyms) * 16 * 18) / 20 : /* 14.4 us per sym */ \
48 ((ksyms) * 16) /* 16.0 us per sym */ \
49 ))
50
51 /* Transmit duration for the raw data part of an average sized packet */
52 #define HE_DURATION(streams, gi, bps) \
53 ((u32)HE_SYMBOL_TIME(gi, MCS_N_KSYMS((streams) * (bps))))
54
55 #define HE_DURATION_S(shift, streams, gi, bps) \
56 (HE_DURATION(streams, gi, bps) >> shift)
57
58 #define BW_20 0
59 #define BW_40 1
60 #define BW_80 2
61 #define BW_160 3
62
63 /*
64 * Define group sort order: HT40 -> SGI -> #streams
65 */
66 #define IEEE80211_MAX_STREAMS 4
67 #define IEEE80211_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */
68 #define IEEE80211_VHT_STREAM_GROUPS 8 /* BW(=4) * SGI(=2) */
69
70 #define IEEE80211_HE_MAX_STREAMS 8
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
77 #define IEEE80211_HT_GROUP_0 0
78 #define IEEE80211_VHT_GROUP_0 (IEEE80211_HT_GROUP_0 + IEEE80211_HT_GROUPS_NB)
79 #define IEEE80211_HE_GROUP_0 (IEEE80211_VHT_GROUP_0 + IEEE80211_VHT_GROUPS_NB)
80
81 #define MCS_GROUP_RATES 12
82
83 #define HT_GROUP_IDX(_streams, _sgi, _ht40) \
84 IEEE80211_HT_GROUP_0 + \
85 IEEE80211_MAX_STREAMS * 2 * _ht40 + \
86 IEEE80211_MAX_STREAMS * _sgi + \
87 _streams - 1
88
89 #define _MAX(a, b) (((a)>(b))?(a):(b))
90
91 #define GROUP_SHIFT(duration) \
92 _MAX(0, 16 - __builtin_clz(duration))
93
94 /* MCS rate information for an MCS group */
95 #define __MCS_GROUP(_streams, _sgi, _ht40, _s) \
96 [HT_GROUP_IDX(_streams, _sgi, _ht40)] = { \
97 .shift = _s, \
98 .duration = { \
99 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 54 : 26), \
100 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 108 : 52), \
101 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 162 : 78), \
102 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 216 : 104), \
103 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 324 : 156), \
104 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 432 : 208), \
105 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 486 : 234), \
106 MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 540 : 260) \
107 } \
108 }
109
110 #define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \
111 GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26))
112
113 #define MCS_GROUP(_streams, _sgi, _ht40) \
114 __MCS_GROUP(_streams, _sgi, _ht40, \
115 MCS_GROUP_SHIFT(_streams, _sgi, _ht40))
116
117 #define VHT_GROUP_IDX(_streams, _sgi, _bw) \
118 (IEEE80211_VHT_GROUP_0 + \
119 IEEE80211_MAX_STREAMS * 2 * (_bw) + \
120 IEEE80211_MAX_STREAMS * (_sgi) + \
121 (_streams) - 1)
122
123 #define BW2VBPS(_bw, r4, r3, r2, r1) \
124 (_bw == BW_160 ? r4 : _bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1)
125
126 #define __VHT_GROUP(_streams, _sgi, _bw, _s) \
127 [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
128 .shift = _s, \
129 .duration = { \
130 MCS_DURATION_S(_s, _streams, _sgi, \
131 BW2VBPS(_bw, 234, 117, 54, 26)), \
132 MCS_DURATION_S(_s, _streams, _sgi, \
133 BW2VBPS(_bw, 468, 234, 108, 52)), \
134 MCS_DURATION_S(_s, _streams, _sgi, \
135 BW2VBPS(_bw, 702, 351, 162, 78)), \
136 MCS_DURATION_S(_s, _streams, _sgi, \
137 BW2VBPS(_bw, 936, 468, 216, 104)), \
138 MCS_DURATION_S(_s, _streams, _sgi, \
139 BW2VBPS(_bw, 1404, 702, 324, 156)), \
140 MCS_DURATION_S(_s, _streams, _sgi, \
141 BW2VBPS(_bw, 1872, 936, 432, 208)), \
142 MCS_DURATION_S(_s, _streams, _sgi, \
143 BW2VBPS(_bw, 2106, 1053, 486, 234)), \
144 MCS_DURATION_S(_s, _streams, _sgi, \
145 BW2VBPS(_bw, 2340, 1170, 540, 260)), \
146 MCS_DURATION_S(_s, _streams, _sgi, \
147 BW2VBPS(_bw, 2808, 1404, 648, 312)), \
148 MCS_DURATION_S(_s, _streams, _sgi, \
149 BW2VBPS(_bw, 3120, 1560, 720, 346)) \
150 } \
151 }
152
153 #define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \
154 GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \
155 BW2VBPS(_bw, 243, 117, 54, 26)))
156
157 #define VHT_GROUP(_streams, _sgi, _bw) \
158 __VHT_GROUP(_streams, _sgi, _bw, \
159 VHT_GROUP_SHIFT(_streams, _sgi, _bw))
160
161
162 #define HE_GROUP_IDX(_streams, _gi, _bw) \
163 (IEEE80211_HE_GROUP_0 + \
164 IEEE80211_HE_MAX_STREAMS * 3 * (_bw) + \
165 IEEE80211_HE_MAX_STREAMS * (_gi) + \
166 (_streams) - 1)
167
168 #define __HE_GROUP(_streams, _gi, _bw, _s) \
169 [HE_GROUP_IDX(_streams, _gi, _bw)] = { \
170 .shift = _s, \
171 .duration = { \
172 HE_DURATION_S(_s, _streams, _gi, \
173 BW2VBPS(_bw, 979, 489, 230, 115)), \
174 HE_DURATION_S(_s, _streams, _gi, \
175 BW2VBPS(_bw, 1958, 979, 475, 230)), \
176 HE_DURATION_S(_s, _streams, _gi, \
177 BW2VBPS(_bw, 2937, 1468, 705, 345)), \
178 HE_DURATION_S(_s, _streams, _gi, \
179 BW2VBPS(_bw, 3916, 1958, 936, 475)), \
180 HE_DURATION_S(_s, _streams, _gi, \
181 BW2VBPS(_bw, 5875, 2937, 1411, 705)), \
182 HE_DURATION_S(_s, _streams, _gi, \
183 BW2VBPS(_bw, 7833, 3916, 1872, 936)), \
184 HE_DURATION_S(_s, _streams, _gi, \
185 BW2VBPS(_bw, 8827, 4406, 2102, 1051)), \
186 HE_DURATION_S(_s, _streams, _gi, \
187 BW2VBPS(_bw, 9806, 4896, 2347, 1166)), \
188 HE_DURATION_S(_s, _streams, _gi, \
189 BW2VBPS(_bw, 11764, 5875, 2808, 1411)), \
190 HE_DURATION_S(_s, _streams, _gi, \
191 BW2VBPS(_bw, 13060, 6523, 3124, 1555)), \
192 HE_DURATION_S(_s, _streams, _gi, \
193 BW2VBPS(_bw, 14702, 7344, 3513, 1756)), \
194 HE_DURATION_S(_s, _streams, _gi, \
195 BW2VBPS(_bw, 16329, 8164, 3902, 1944)) \
196 } \
197 }
198
199 #define HE_GROUP_SHIFT(_streams, _gi, _bw) \
200 GROUP_SHIFT(HE_DURATION(_streams, _gi, \
201 BW2VBPS(_bw, 979, 489, 230, 115)))
202
203 #define HE_GROUP(_streams, _gi, _bw) \
204 __HE_GROUP(_streams, _gi, _bw, \
205 HE_GROUP_SHIFT(_streams, _gi, _bw))
206 struct mcs_group {
207 u8 shift;
208 u16 duration[MCS_GROUP_RATES];
209 };
210
211 static const struct mcs_group airtime_mcs_groups[] = {
212 MCS_GROUP(1, 0, BW_20),
213 MCS_GROUP(2, 0, BW_20),
214 MCS_GROUP(3, 0, BW_20),
215 MCS_GROUP(4, 0, BW_20),
216
217 MCS_GROUP(1, 1, BW_20),
218 MCS_GROUP(2, 1, BW_20),
219 MCS_GROUP(3, 1, BW_20),
220 MCS_GROUP(4, 1, BW_20),
221
222 MCS_GROUP(1, 0, BW_40),
223 MCS_GROUP(2, 0, BW_40),
224 MCS_GROUP(3, 0, BW_40),
225 MCS_GROUP(4, 0, BW_40),
226
227 MCS_GROUP(1, 1, BW_40),
228 MCS_GROUP(2, 1, BW_40),
229 MCS_GROUP(3, 1, BW_40),
230 MCS_GROUP(4, 1, BW_40),
231
232 VHT_GROUP(1, 0, BW_20),
233 VHT_GROUP(2, 0, BW_20),
234 VHT_GROUP(3, 0, BW_20),
235 VHT_GROUP(4, 0, BW_20),
236
237 VHT_GROUP(1, 1, BW_20),
238 VHT_GROUP(2, 1, BW_20),
239 VHT_GROUP(3, 1, BW_20),
240 VHT_GROUP(4, 1, BW_20),
241
242 VHT_GROUP(1, 0, BW_40),
243 VHT_GROUP(2, 0, BW_40),
244 VHT_GROUP(3, 0, BW_40),
245 VHT_GROUP(4, 0, BW_40),
246
247 VHT_GROUP(1, 1, BW_40),
248 VHT_GROUP(2, 1, BW_40),
249 VHT_GROUP(3, 1, BW_40),
250 VHT_GROUP(4, 1, BW_40),
251
252 VHT_GROUP(1, 0, BW_80),
253 VHT_GROUP(2, 0, BW_80),
254 VHT_GROUP(3, 0, BW_80),
255 VHT_GROUP(4, 0, BW_80),
256
257 VHT_GROUP(1, 1, BW_80),
258 VHT_GROUP(2, 1, BW_80),
259 VHT_GROUP(3, 1, BW_80),
260 VHT_GROUP(4, 1, BW_80),
261
262 VHT_GROUP(1, 0, BW_160),
263 VHT_GROUP(2, 0, BW_160),
264 VHT_GROUP(3, 0, BW_160),
265 VHT_GROUP(4, 0, BW_160),
266
267 VHT_GROUP(1, 1, BW_160),
268 VHT_GROUP(2, 1, BW_160),
269 VHT_GROUP(3, 1, BW_160),
270 VHT_GROUP(4, 1, BW_160),
271
272 HE_GROUP(1, HE_GI_08, BW_20),
273 HE_GROUP(2, HE_GI_08, BW_20),
274 HE_GROUP(3, HE_GI_08, BW_20),
275 HE_GROUP(4, HE_GI_08, BW_20),
276 HE_GROUP(5, HE_GI_08, BW_20),
277 HE_GROUP(6, HE_GI_08, BW_20),
278 HE_GROUP(7, HE_GI_08, BW_20),
279 HE_GROUP(8, HE_GI_08, BW_20),
280
281 HE_GROUP(1, HE_GI_16, BW_20),
282 HE_GROUP(2, HE_GI_16, BW_20),
283 HE_GROUP(3, HE_GI_16, BW_20),
284 HE_GROUP(4, HE_GI_16, BW_20),
285 HE_GROUP(5, HE_GI_16, BW_20),
286 HE_GROUP(6, HE_GI_16, BW_20),
287 HE_GROUP(7, HE_GI_16, BW_20),
288 HE_GROUP(8, HE_GI_16, BW_20),
289
290 HE_GROUP(1, HE_GI_32, BW_20),
291 HE_GROUP(2, HE_GI_32, BW_20),
292 HE_GROUP(3, HE_GI_32, BW_20),
293 HE_GROUP(4, HE_GI_32, BW_20),
294 HE_GROUP(5, HE_GI_32, BW_20),
295 HE_GROUP(6, HE_GI_32, BW_20),
296 HE_GROUP(7, HE_GI_32, BW_20),
297 HE_GROUP(8, HE_GI_32, BW_20),
298
299 HE_GROUP(1, HE_GI_08, BW_40),
300 HE_GROUP(2, HE_GI_08, BW_40),
301 HE_GROUP(3, HE_GI_08, BW_40),
302 HE_GROUP(4, HE_GI_08, BW_40),
303 HE_GROUP(5, HE_GI_08, BW_40),
304 HE_GROUP(6, HE_GI_08, BW_40),
305 HE_GROUP(7, HE_GI_08, BW_40),
306 HE_GROUP(8, HE_GI_08, BW_40),
307
308 HE_GROUP(1, HE_GI_16, BW_40),
309 HE_GROUP(2, HE_GI_16, BW_40),
310 HE_GROUP(3, HE_GI_16, BW_40),
311 HE_GROUP(4, HE_GI_16, BW_40),
312 HE_GROUP(5, HE_GI_16, BW_40),
313 HE_GROUP(6, HE_GI_16, BW_40),
314 HE_GROUP(7, HE_GI_16, BW_40),
315 HE_GROUP(8, HE_GI_16, BW_40),
316
317 HE_GROUP(1, HE_GI_32, BW_40),
318 HE_GROUP(2, HE_GI_32, BW_40),
319 HE_GROUP(3, HE_GI_32, BW_40),
320 HE_GROUP(4, HE_GI_32, BW_40),
321 HE_GROUP(5, HE_GI_32, BW_40),
322 HE_GROUP(6, HE_GI_32, BW_40),
323 HE_GROUP(7, HE_GI_32, BW_40),
324 HE_GROUP(8, HE_GI_32, BW_40),
325
326 HE_GROUP(1, HE_GI_08, BW_80),
327 HE_GROUP(2, HE_GI_08, BW_80),
328 HE_GROUP(3, HE_GI_08, BW_80),
329 HE_GROUP(4, HE_GI_08, BW_80),
330 HE_GROUP(5, HE_GI_08, BW_80),
331 HE_GROUP(6, HE_GI_08, BW_80),
332 HE_GROUP(7, HE_GI_08, BW_80),
333 HE_GROUP(8, HE_GI_08, BW_80),
334
335 HE_GROUP(1, HE_GI_16, BW_80),
336 HE_GROUP(2, HE_GI_16, BW_80),
337 HE_GROUP(3, HE_GI_16, BW_80),
338 HE_GROUP(4, HE_GI_16, BW_80),
339 HE_GROUP(5, HE_GI_16, BW_80),
340 HE_GROUP(6, HE_GI_16, BW_80),
341 HE_GROUP(7, HE_GI_16, BW_80),
342 HE_GROUP(8, HE_GI_16, BW_80),
343
344 HE_GROUP(1, HE_GI_32, BW_80),
345 HE_GROUP(2, HE_GI_32, BW_80),
346 HE_GROUP(3, HE_GI_32, BW_80),
347 HE_GROUP(4, HE_GI_32, BW_80),
348 HE_GROUP(5, HE_GI_32, BW_80),
349 HE_GROUP(6, HE_GI_32, BW_80),
350 HE_GROUP(7, HE_GI_32, BW_80),
351 HE_GROUP(8, HE_GI_32, BW_80),
352
353 HE_GROUP(1, HE_GI_08, BW_160),
354 HE_GROUP(2, HE_GI_08, BW_160),
355 HE_GROUP(3, HE_GI_08, BW_160),
356 HE_GROUP(4, HE_GI_08, BW_160),
357 HE_GROUP(5, HE_GI_08, BW_160),
358 HE_GROUP(6, HE_GI_08, BW_160),
359 HE_GROUP(7, HE_GI_08, BW_160),
360 HE_GROUP(8, HE_GI_08, BW_160),
361
362 HE_GROUP(1, HE_GI_16, BW_160),
363 HE_GROUP(2, HE_GI_16, BW_160),
364 HE_GROUP(3, HE_GI_16, BW_160),
365 HE_GROUP(4, HE_GI_16, BW_160),
366 HE_GROUP(5, HE_GI_16, BW_160),
367 HE_GROUP(6, HE_GI_16, BW_160),
368 HE_GROUP(7, HE_GI_16, BW_160),
369 HE_GROUP(8, HE_GI_16, BW_160),
370
371 HE_GROUP(1, HE_GI_32, BW_160),
372 HE_GROUP(2, HE_GI_32, BW_160),
373 HE_GROUP(3, HE_GI_32, BW_160),
374 HE_GROUP(4, HE_GI_32, BW_160),
375 HE_GROUP(5, HE_GI_32, BW_160),
376 HE_GROUP(6, HE_GI_32, BW_160),
377 HE_GROUP(7, HE_GI_32, BW_160),
378 HE_GROUP(8, HE_GI_32, BW_160),
379 };
380
381 static u32
382 ieee80211_calc_legacy_rate_duration(u16 bitrate, bool short_pre,
383 bool cck, int len)
384 {
385 u32 duration;
386
387 if (cck) {
388 duration = 144 + 48; /* preamble + PLCP */
389 if (short_pre)
390 duration >>= 1;
391
392 duration += 10; /* SIFS */
393 } else {
394 duration = 20 + 16; /* premable + SIFS */
395 }
396
397 len <<= 3;
398 duration += (len * 10) / bitrate;
399
400 return duration;
401 }
402
403 static u32 ieee80211_get_rate_duration(struct ieee80211_hw *hw,
404 struct ieee80211_rx_status *status,
405 u32 *overhead)
406 {
407 bool sgi = status->enc_flags & RX_ENC_FLAG_SHORT_GI;
408 int bw, streams;
409 int group, idx;
410 u32 duration;
411
412 switch (status->bw) {
413 case RATE_INFO_BW_20:
414 bw = BW_20;
415 break;
416 case RATE_INFO_BW_40:
417 bw = BW_40;
418 break;
419 case RATE_INFO_BW_80:
420 bw = BW_80;
421 break;
422 case RATE_INFO_BW_160:
423 bw = BW_160;
424 break;
425 default:
426 WARN_ON_ONCE(1);
427 return 0;
428 }
429
430 switch (status->encoding) {
431 case RX_ENC_VHT:
432 streams = status->nss;
433 idx = status->rate_idx;
434 group = VHT_GROUP_IDX(streams, sgi, bw);
435 break;
436 case RX_ENC_HT:
437 streams = ((status->rate_idx >> 3) & 3) + 1;
438 idx = status->rate_idx & 7;
439 group = HT_GROUP_IDX(streams, sgi, bw);
440 break;
441 case RX_ENC_HE:
442 streams = status->nss;
443 idx = status->rate_idx;
444 group = HE_GROUP_IDX(streams, status->he_gi, bw);
445 break;
446 default:
447 WARN_ON_ONCE(1);
448 return 0;
449 }
450
451 if (WARN_ON_ONCE((status->encoding != RX_ENC_HE && streams > 4) ||
452 (status->encoding == RX_ENC_HE && streams > 8)))
453 return 0;
454
455 if (idx >= MCS_GROUP_RATES)
456 return 0;
457
458 duration = airtime_mcs_groups[group].duration[idx];
459 duration <<= airtime_mcs_groups[group].shift;
460 *overhead = 36 + (streams << 2);
461
462 return duration;
463 }
464
465
466 u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw,
467 struct ieee80211_rx_status *status,
468 int len)
469 {
470 struct ieee80211_supported_band *sband;
471 u32 duration, overhead = 0;
472
473 if (status->encoding == RX_ENC_LEGACY) {
474 const struct ieee80211_rate *rate;
475 bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE;
476 bool cck;
477
478 /* on 60GHz or sub-1GHz band, there are no legacy rates */
479 if (WARN_ON_ONCE(status->band == NL80211_BAND_60GHZ ||
480 status->band == NL80211_BAND_S1GHZ))
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 }
504 EXPORT_SYMBOL_GPL(ieee80211_calc_rx_airtime);
505
506 static 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
549 static 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 (!ieee80211_rate_valid(rate))
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
592 static 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
605 u32 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 }
626 EXPORT_SYMBOL_GPL(ieee80211_calc_tx_airtime);
627
628 u32 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;
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->bss_conf.chanctx_conf);
644 if (conf)
645 band = conf->def.chan->band;
646
647 if (pubsta) {
648 struct sta_info *sta = container_of(pubsta, struct sta_info,
649 sta);
650 struct ieee80211_rx_status stat;
651 struct ieee80211_tx_rate *tx_rate = &sta->deflink.tx_stats.last_rate;
652 struct rate_info *ri = &sta->deflink.tx_stats.last_rate_info;
653 u32 duration, overhead;
654 u8 agg_shift;
655
656 if (ieee80211_fill_rx_status(&stat, hw, tx_rate, ri, band, len))
657 return 0;
658
659 if (stat.encoding == RX_ENC_LEGACY || !ampdu)
660 return ieee80211_calc_rx_airtime(hw, &stat, len);
661
662 duration = ieee80211_get_rate_duration(hw, &stat, &overhead);
663 /*
664 * Assume that HT/VHT transmission on any AC except VO will
665 * use aggregation. Since we don't have reliable reporting
666 * of aggregation length, assume an average size based on the
667 * tx rate.
668 * This will not be very accurate, but much better than simply
669 * assuming un-aggregated tx in all cases.
670 */
671 if (duration > 400 * 1024) /* <= VHT20 MCS2 1S */
672 agg_shift = 1;
673 else if (duration > 250 * 1024) /* <= VHT20 MCS3 1S or MCS1 2S */
674 agg_shift = 2;
675 else if (duration > 150 * 1024) /* <= VHT20 MCS5 1S or MCS2 2S */
676 agg_shift = 3;
677 else if (duration > 70 * 1024) /* <= VHT20 MCS5 2S */
678 agg_shift = 4;
679 else if (stat.encoding != RX_ENC_HE ||
680 duration > 20 * 1024) /* <= HE40 MCS6 2S */
681 agg_shift = 5;
682 else
683 agg_shift = 6;
684
685 duration *= len;
686 duration /= AVG_PKT_SIZE;
687 duration /= 1024;
688 duration += (overhead >> agg_shift);
689
690 return max_t(u32, duration, 4);
691 }
692
693 if (!conf)
694 return 0;
695
696 /* No station to get latest rate from, so calculate the worst-case
697 * duration using the lowest configured basic rate.
698 */
699 sband = hw->wiphy->bands[band];
700
701 basic_rates = vif->bss_conf.basic_rates;
702 short_pream = vif->bss_conf.use_short_preamble;
703
704 rateidx = basic_rates ? ffs(basic_rates) - 1 : 0;
705 rate = sband->bitrates[rateidx].bitrate;
706 cck = sband->bitrates[rateidx].flags & IEEE80211_RATE_MANDATORY_B;
707
708 return ieee80211_calc_legacy_rate_duration(rate, short_pream, cck, len);
709 }
710
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