1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * VHT handling
4 *
5 * Portions of this file
6 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
7 * Copyright (C) 2018 - 2024 Intel Corporation
8 */
9
10#include <linux/ieee80211.h>
11#include <linux/export.h>
12#include <net/mac80211.h>
13#include "ieee80211_i.h"
14#include "rate.h"
15
16
17static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
18 struct ieee80211_sta_vht_cap *vht_cap,
19 u32 flag)
20{
21 __le32 le_flag = cpu_to_le32(flag);
22
23 if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
24 !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
25 vht_cap->cap &= ~flag;
26}
27
28void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
29 struct ieee80211_sta_vht_cap *vht_cap)
30{
31 int i;
32 u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;
33
34 if (!vht_cap->vht_supported)
35 return;
36
37 if (sdata->vif.type != NL80211_IFTYPE_STATION)
38 return;
39
40 __check_vhtcap_disable(sdata, vht_cap,
41 IEEE80211_VHT_CAP_RXLDPC);
42 __check_vhtcap_disable(sdata, vht_cap,
43 IEEE80211_VHT_CAP_SHORT_GI_80);
44 __check_vhtcap_disable(sdata, vht_cap,
45 IEEE80211_VHT_CAP_SHORT_GI_160);
46 __check_vhtcap_disable(sdata, vht_cap,
47 IEEE80211_VHT_CAP_TXSTBC);
48 __check_vhtcap_disable(sdata, vht_cap,
49 IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
50 __check_vhtcap_disable(sdata, vht_cap,
51 IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
52 __check_vhtcap_disable(sdata, vht_cap,
53 IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
54 __check_vhtcap_disable(sdata, vht_cap,
55 IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);
56
57 /* Allow user to decrease AMPDU length exponent */
58 if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
59 cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
60 u32 cap, n;
61
62 n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
63 IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
64 n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
65 cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
66 cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
67
68 if (n < cap) {
69 vht_cap->cap &=
70 ~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
71 vht_cap->cap |=
72 n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
73 }
74 }
75
76 /* Allow the user to decrease MCSes */
77 rxmcs_mask =
78 le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
79 rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
80 rxmcs_n &= rxmcs_mask;
81 rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
82
83 txmcs_mask =
84 le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
85 txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
86 txmcs_n &= txmcs_mask;
87 txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
88 for (i = 0; i < 8; i++) {
89 u8 m, n, c;
90
91 m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
92 n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
93 c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
94
95 if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
96 n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
97 rxmcs_cap &= ~(3 << 2*i);
98 rxmcs_cap |= (rxmcs_n & (3 << 2*i));
99 }
100
101 m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
102 n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
103 c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
104
105 if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
106 n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
107 txmcs_cap &= ~(3 << 2*i);
108 txmcs_cap |= (txmcs_n & (3 << 2*i));
109 }
110 }
111 vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
112 vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
113}
114
115void
116ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
117 struct ieee80211_supported_band *sband,
118 const struct ieee80211_vht_cap *vht_cap_ie,
119 const struct ieee80211_vht_cap *vht_cap_ie2,
120 struct link_sta_info *link_sta)
121{
122 struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
123 struct ieee80211_sta_vht_cap own_cap;
124 u32 cap_info, i;
125 bool have_80mhz;
126 u32 mpdu_len;
127
128 memset(s: vht_cap, c: 0, n: sizeof(*vht_cap));
129
130 if (!link_sta->pub->ht_cap.ht_supported)
131 return;
132
133 if (!vht_cap_ie || !sband->vht_cap.vht_supported)
134 return;
135
136 /* Allow VHT if at least one channel on the sband supports 80 MHz */
137 have_80mhz = false;
138 for (i = 0; i < sband->n_channels; i++) {
139 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
140 IEEE80211_CHAN_NO_80MHZ))
141 continue;
142
143 have_80mhz = true;
144 break;
145 }
146
147 if (!have_80mhz)
148 return;
149
150 /*
151 * A VHT STA must support 40 MHz, but if we verify that here
152 * then we break a few things - some APs (e.g. Netgear R6300v2
153 * and others based on the BCM4360 chipset) will unset this
154 * capability bit when operating in 20 MHz.
155 */
156
157 vht_cap->vht_supported = true;
158
159 own_cap = sband->vht_cap;
160 /*
161 * If user has specified capability overrides, take care
162 * of that if the station we're setting up is the AP that
163 * we advertised a restricted capability set to. Override
164 * our own capabilities and then use those below.
165 */
166 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
167 !test_sta_flag(sta: link_sta->sta, flag: WLAN_STA_TDLS_PEER))
168 ieee80211_apply_vhtcap_overrides(sdata, vht_cap: &own_cap);
169
170 /* take some capabilities as-is */
171 cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
172 vht_cap->cap = cap_info;
173 vht_cap->cap &= IEEE80211_VHT_CAP_RXLDPC |
174 IEEE80211_VHT_CAP_VHT_TXOP_PS |
175 IEEE80211_VHT_CAP_HTC_VHT |
176 IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
177 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB |
178 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB |
179 IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
180 IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;
181
182 vht_cap->cap |= min_t(u32, cap_info & IEEE80211_VHT_CAP_MAX_MPDU_MASK,
183 own_cap.cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK);
184
185 /* and some based on our own capabilities */
186 switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
187 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
188 vht_cap->cap |= cap_info &
189 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
190 break;
191 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
192 vht_cap->cap |= cap_info &
193 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
194 break;
195 default:
196 /* nothing */
197 break;
198 }
199
200 /* symmetric capabilities */
201 vht_cap->cap |= cap_info & own_cap.cap &
202 (IEEE80211_VHT_CAP_SHORT_GI_80 |
203 IEEE80211_VHT_CAP_SHORT_GI_160);
204
205 /* remaining ones */
206 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
207 vht_cap->cap |= cap_info &
208 (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
209 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);
210
211 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
212 vht_cap->cap |= cap_info &
213 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
214 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);
215
216 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
217 vht_cap->cap |= cap_info &
218 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
219
220 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
221 vht_cap->cap |= cap_info &
222 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;
223
224 if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
225 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;
226
227 if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
228 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC;
229
230 /* Copy peer MCS info, the driver might need them. */
231 memcpy(to: &vht_cap->vht_mcs, from: &vht_cap_ie->supp_mcs,
232 len: sizeof(struct ieee80211_vht_mcs_info));
233
234 /* copy EXT_NSS_BW Support value or remove the capability */
235 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW))
236 vht_cap->cap |= (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
237 else
238 vht_cap->vht_mcs.tx_highest &=
239 ~cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);
240
241 /* but also restrict MCSes */
242 for (i = 0; i < 8; i++) {
243 u16 own_rx, own_tx, peer_rx, peer_tx;
244
245 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
246 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
247
248 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
249 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
250
251 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
252 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
253
254 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
255 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
256
257 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
258 if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
259 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
260 else if (own_rx < peer_tx)
261 peer_tx = own_rx;
262 }
263
264 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
265 if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
266 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
267 else if (own_tx < peer_rx)
268 peer_rx = own_tx;
269 }
270
271 vht_cap->vht_mcs.rx_mcs_map &=
272 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
273 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2);
274
275 vht_cap->vht_mcs.tx_mcs_map &=
276 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
277 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2);
278 }
279
280 /*
281 * This is a workaround for VHT-enabled STAs which break the spec
282 * and have the VHT-MCS Rx map filled in with value 3 for all eight
283 * spatial streams, an example is AR9462.
284 *
285 * As per spec, in section 22.1.1 Introduction to the VHT PHY
286 * A VHT STA shall support at least single spatial stream VHT-MCSs
287 * 0 to 7 (transmit and receive) in all supported channel widths.
288 */
289 if (vht_cap->vht_mcs.rx_mcs_map == cpu_to_le16(0xFFFF)) {
290 vht_cap->vht_supported = false;
291 sdata_info(sdata,
292 "Ignoring VHT IE from %pM (link:%pM) due to invalid rx_mcs_map\n",
293 link_sta->sta->addr, link_sta->addr);
294 return;
295 }
296
297 /* finally set up the bandwidth */
298 switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
299 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
300 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
301 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
302 break;
303 default:
304 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
305
306 if (!(vht_cap->vht_mcs.tx_highest &
307 cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
308 break;
309
310 /*
311 * If this is non-zero, then it does support 160 MHz after all,
312 * in one form or the other. We don't distinguish here (or even
313 * above) between 160 and 80+80 yet.
314 */
315 if (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
316 link_sta->cur_max_bandwidth =
317 IEEE80211_STA_RX_BW_160;
318 }
319
320 link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);
321
322 /*
323 * Work around the Cisco 9115 FW 17.3 bug by taking the min of
324 * both reported MPDU lengths.
325 */
326 mpdu_len = vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK;
327 if (vht_cap_ie2)
328 mpdu_len = min_t(u32, mpdu_len,
329 le32_get_bits(vht_cap_ie2->vht_cap_info,
330 IEEE80211_VHT_CAP_MAX_MPDU_MASK));
331
332 /*
333 * FIXME - should the amsdu len be per link? store per link
334 * and maintain a minimum?
335 */
336 switch (mpdu_len) {
337 case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
338 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
339 break;
340 case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
341 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
342 break;
343 case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
344 default:
345 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
346 break;
347 }
348
349 ieee80211_sta_recalc_aggregates(pubsta: &link_sta->sta->sta);
350}
351
352/* FIXME: move this to some better location - parses HE/EHT now */
353static enum ieee80211_sta_rx_bandwidth
354__ieee80211_sta_cap_rx_bw(struct link_sta_info *link_sta,
355 struct cfg80211_chan_def *chandef)
356{
357 unsigned int link_id = link_sta->link_id;
358 struct ieee80211_sub_if_data *sdata = link_sta->sta->sdata;
359 struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
360 struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
361 struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
362 u32 cap_width;
363
364 if (he_cap->has_he) {
365 enum nl80211_band band;
366 u8 info;
367
368 if (chandef) {
369 band = chandef->chan->band;
370 } else {
371 struct ieee80211_bss_conf *link_conf;
372
373 rcu_read_lock();
374 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
375 band = link_conf->chanreq.oper.chan->band;
376 rcu_read_unlock();
377 }
378
379 if (eht_cap->has_eht && band == NL80211_BAND_6GHZ) {
380 info = eht_cap->eht_cap_elem.phy_cap_info[0];
381
382 if (info & IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ)
383 return IEEE80211_STA_RX_BW_320;
384 }
385
386 info = he_cap->he_cap_elem.phy_cap_info[0];
387
388 if (band == NL80211_BAND_2GHZ) {
389 if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G)
390 return IEEE80211_STA_RX_BW_40;
391 return IEEE80211_STA_RX_BW_20;
392 }
393
394 if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G ||
395 info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G)
396 return IEEE80211_STA_RX_BW_160;
397
398 if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)
399 return IEEE80211_STA_RX_BW_80;
400
401 return IEEE80211_STA_RX_BW_20;
402 }
403
404 if (!vht_cap->vht_supported)
405 return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
406 IEEE80211_STA_RX_BW_40 :
407 IEEE80211_STA_RX_BW_20;
408
409 cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
410
411 if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
412 cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
413 return IEEE80211_STA_RX_BW_160;
414
415 /*
416 * If this is non-zero, then it does support 160 MHz after all,
417 * in one form or the other. We don't distinguish here (or even
418 * above) between 160 and 80+80 yet.
419 */
420 if (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
421 return IEEE80211_STA_RX_BW_160;
422
423 return IEEE80211_STA_RX_BW_80;
424}
425
426enum ieee80211_sta_rx_bandwidth
427_ieee80211_sta_cap_rx_bw(struct link_sta_info *link_sta,
428 struct cfg80211_chan_def *chandef)
429{
430 /*
431 * With RX OMI, also pretend that the STA's capability changed.
432 * Of course this isn't really true, it didn't change, only our
433 * RX capability was changed by notifying RX OMI to the STA.
434 * The purpose, however, is to save power, and that requires
435 * changing also transmissions to the AP and the chanctx. The
436 * transmissions depend on link_sta->bandwidth which is set in
437 * _ieee80211_sta_cur_vht_bw() below, but the chanctx depends
438 * on the result of this function which is also called by
439 * _ieee80211_sta_cur_vht_bw(), so we need to do that here as
440 * well. This is sufficient for the steady state, but during
441 * the transition we already need to change TX/RX separately,
442 * so _ieee80211_sta_cur_vht_bw() below applies the _tx one.
443 */
444 return min(__ieee80211_sta_cap_rx_bw(link_sta, chandef),
445 link_sta->rx_omi_bw_rx);
446}
447
448enum nl80211_chan_width
449ieee80211_sta_cap_chan_bw(struct link_sta_info *link_sta)
450{
451 struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
452 u32 cap_width;
453
454 if (!vht_cap->vht_supported) {
455 if (!link_sta->pub->ht_cap.ht_supported)
456 return NL80211_CHAN_WIDTH_20_NOHT;
457
458 return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
459 NL80211_CHAN_WIDTH_40 : NL80211_CHAN_WIDTH_20;
460 }
461
462 cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
463
464 if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
465 return NL80211_CHAN_WIDTH_160;
466 else if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
467 return NL80211_CHAN_WIDTH_80P80;
468
469 return NL80211_CHAN_WIDTH_80;
470}
471
472enum nl80211_chan_width
473ieee80211_sta_rx_bw_to_chan_width(struct link_sta_info *link_sta)
474{
475 enum ieee80211_sta_rx_bandwidth cur_bw =
476 link_sta->pub->bandwidth;
477 struct ieee80211_sta_vht_cap *vht_cap =
478 &link_sta->pub->vht_cap;
479 u32 cap_width;
480
481 switch (cur_bw) {
482 case IEEE80211_STA_RX_BW_20:
483 if (!link_sta->pub->ht_cap.ht_supported)
484 return NL80211_CHAN_WIDTH_20_NOHT;
485 else
486 return NL80211_CHAN_WIDTH_20;
487 case IEEE80211_STA_RX_BW_40:
488 return NL80211_CHAN_WIDTH_40;
489 case IEEE80211_STA_RX_BW_80:
490 return NL80211_CHAN_WIDTH_80;
491 case IEEE80211_STA_RX_BW_160:
492 cap_width =
493 vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
494
495 if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
496 return NL80211_CHAN_WIDTH_160;
497
498 return NL80211_CHAN_WIDTH_80P80;
499 default:
500 return NL80211_CHAN_WIDTH_20;
501 }
502}
503
504/* FIXME: rename/move - this deals with everything not just VHT */
505enum ieee80211_sta_rx_bandwidth
506_ieee80211_sta_cur_vht_bw(struct link_sta_info *link_sta,
507 struct cfg80211_chan_def *chandef)
508{
509 struct sta_info *sta = link_sta->sta;
510 enum nl80211_chan_width bss_width;
511 enum ieee80211_sta_rx_bandwidth bw;
512
513 if (chandef) {
514 bss_width = chandef->width;
515 } else {
516 struct ieee80211_bss_conf *link_conf;
517
518 rcu_read_lock();
519 link_conf = rcu_dereference(sta->sdata->vif.link_conf[link_sta->link_id]);
520 if (WARN_ON_ONCE(!link_conf)) {
521 rcu_read_unlock();
522 return IEEE80211_STA_RX_BW_20;
523 }
524 bss_width = link_conf->chanreq.oper.width;
525 rcu_read_unlock();
526 }
527
528 /* intentionally do not take rx_bw_omi_rx into account */
529 bw = __ieee80211_sta_cap_rx_bw(link_sta, chandef);
530 bw = min(bw, link_sta->cur_max_bandwidth);
531 /* but do apply rx_omi_bw_tx */
532 bw = min(bw, link_sta->rx_omi_bw_tx);
533
534 /* Don't consider AP's bandwidth for TDLS peers, section 11.23.1 of
535 * IEEE80211-2016 specification makes higher bandwidth operation
536 * possible on the TDLS link if the peers have wider bandwidth
537 * capability.
538 *
539 * However, in this case, and only if the TDLS peer is authorized,
540 * limit to the tdls_chandef so that the configuration here isn't
541 * wider than what's actually requested on the channel context.
542 */
543 if (test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER) &&
544 test_sta_flag(sta, flag: WLAN_STA_TDLS_WIDER_BW) &&
545 test_sta_flag(sta, flag: WLAN_STA_AUTHORIZED) &&
546 sta->tdls_chandef.chan)
547 bw = min(bw, ieee80211_chan_width_to_rx_bw(sta->tdls_chandef.width));
548 else
549 bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));
550
551 return bw;
552}
553
554void ieee80211_sta_init_nss(struct link_sta_info *link_sta)
555{
556 u8 ht_rx_nss = 0, vht_rx_nss = 0, he_rx_nss = 0, eht_rx_nss = 0, rx_nss;
557 bool support_160;
558
559 if (link_sta->pub->eht_cap.has_eht) {
560 int i;
561 const u8 *rx_nss_mcs = (void *)&link_sta->pub->eht_cap.eht_mcs_nss_supp;
562
563 /* get the max nss for EHT over all possible bandwidths and mcs */
564 for (i = 0; i < sizeof(struct ieee80211_eht_mcs_nss_supp); i++)
565 eht_rx_nss = max_t(u8, eht_rx_nss,
566 u8_get_bits(rx_nss_mcs[i],
567 IEEE80211_EHT_MCS_NSS_RX));
568 }
569
570 if (link_sta->pub->he_cap.has_he) {
571 int i;
572 u8 rx_mcs_80 = 0, rx_mcs_160 = 0;
573 const struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
574 u16 mcs_160_map =
575 le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_160);
576 u16 mcs_80_map = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_80);
577
578 for (i = 7; i >= 0; i--) {
579 u8 mcs_160 = (mcs_160_map >> (2 * i)) & 3;
580
581 if (mcs_160 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
582 rx_mcs_160 = i + 1;
583 break;
584 }
585 }
586 for (i = 7; i >= 0; i--) {
587 u8 mcs_80 = (mcs_80_map >> (2 * i)) & 3;
588
589 if (mcs_80 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
590 rx_mcs_80 = i + 1;
591 break;
592 }
593 }
594
595 support_160 = he_cap->he_cap_elem.phy_cap_info[0] &
596 IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
597
598 if (support_160)
599 he_rx_nss = min(rx_mcs_80, rx_mcs_160);
600 else
601 he_rx_nss = rx_mcs_80;
602 }
603
604 if (link_sta->pub->ht_cap.ht_supported) {
605 if (link_sta->pub->ht_cap.mcs.rx_mask[0])
606 ht_rx_nss++;
607 if (link_sta->pub->ht_cap.mcs.rx_mask[1])
608 ht_rx_nss++;
609 if (link_sta->pub->ht_cap.mcs.rx_mask[2])
610 ht_rx_nss++;
611 if (link_sta->pub->ht_cap.mcs.rx_mask[3])
612 ht_rx_nss++;
613 /* FIXME: consider rx_highest? */
614 }
615
616 if (link_sta->pub->vht_cap.vht_supported) {
617 int i;
618 u16 rx_mcs_map;
619
620 rx_mcs_map = le16_to_cpu(link_sta->pub->vht_cap.vht_mcs.rx_mcs_map);
621
622 for (i = 7; i >= 0; i--) {
623 u8 mcs = (rx_mcs_map >> (2 * i)) & 3;
624
625 if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
626 vht_rx_nss = i + 1;
627 break;
628 }
629 }
630 /* FIXME: consider rx_highest? */
631 }
632
633 rx_nss = max(vht_rx_nss, ht_rx_nss);
634 rx_nss = max(he_rx_nss, rx_nss);
635 rx_nss = max(eht_rx_nss, rx_nss);
636 rx_nss = max_t(u8, 1, rx_nss);
637 link_sta->capa_nss = rx_nss;
638
639 /* that shouldn't be set yet, but we can handle it anyway */
640 if (link_sta->op_mode_nss)
641 link_sta->pub->rx_nss =
642 min_t(u8, rx_nss, link_sta->op_mode_nss);
643 else
644 link_sta->pub->rx_nss = rx_nss;
645}
646
647u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
648 struct link_sta_info *link_sta,
649 u8 opmode, enum nl80211_band band)
650{
651 enum ieee80211_sta_rx_bandwidth new_bw;
652 struct sta_opmode_info sta_opmode = {};
653 u32 changed = 0;
654 u8 nss;
655
656 /* ignore - no support for BF yet */
657 if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
658 return 0;
659
660 nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
661 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
662 nss += 1;
663
664 if (link_sta->op_mode_nss != nss) {
665 if (nss <= link_sta->capa_nss) {
666 link_sta->op_mode_nss = nss;
667
668 if (nss != link_sta->pub->rx_nss) {
669 link_sta->pub->rx_nss = nss;
670 changed |= IEEE80211_RC_NSS_CHANGED;
671 sta_opmode.rx_nss = link_sta->pub->rx_nss;
672 sta_opmode.changed |= STA_OPMODE_N_SS_CHANGED;
673 }
674 } else {
675 sdata_dbg(sdata,
676 "Ignore NSS change to invalid %d in VHT opmode notif from %pM",
677 nss, link_sta->pub->addr);
678 }
679 }
680
681 switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
682 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
683 /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
684 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
685 break;
686 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
687 /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
688 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
689 break;
690 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
691 if (opmode & IEEE80211_OPMODE_NOTIF_BW_160_80P80)
692 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
693 else
694 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
695 break;
696 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
697 /* legacy only, no longer used by newer spec */
698 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
699 break;
700 }
701
702 new_bw = ieee80211_sta_cur_vht_bw(link_sta);
703 if (new_bw != link_sta->pub->bandwidth) {
704 link_sta->pub->bandwidth = new_bw;
705 sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(link_sta);
706 changed |= IEEE80211_RC_BW_CHANGED;
707 sta_opmode.changed |= STA_OPMODE_MAX_BW_CHANGED;
708 }
709
710 if (sta_opmode.changed)
711 cfg80211_sta_opmode_change_notify(dev: sdata->dev, mac: link_sta->addr,
712 sta_opmode: &sta_opmode, GFP_KERNEL);
713
714 return changed;
715}
716
717void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
718 struct ieee80211_link_data *link,
719 struct ieee80211_mgmt *mgmt)
720{
721 struct ieee80211_bss_conf *link_conf = link->conf;
722
723 if (!link_conf->mu_mimo_owner)
724 return;
725
726 if (!memcmp(mgmt->u.action.u.vht_group_notif.position,
727 link_conf->mu_group.position, WLAN_USER_POSITION_LEN) &&
728 !memcmp(mgmt->u.action.u.vht_group_notif.membership,
729 link_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN))
730 return;
731
732 memcpy(to: link_conf->mu_group.membership,
733 from: mgmt->u.action.u.vht_group_notif.membership,
734 WLAN_MEMBERSHIP_LEN);
735 memcpy(to: link_conf->mu_group.position,
736 from: mgmt->u.action.u.vht_group_notif.position,
737 WLAN_USER_POSITION_LEN);
738
739 ieee80211_link_info_change_notify(sdata, link,
740 changed: BSS_CHANGED_MU_GROUPS);
741}
742
743void ieee80211_update_mu_groups(struct ieee80211_vif *vif, unsigned int link_id,
744 const u8 *membership, const u8 *position)
745{
746 struct ieee80211_bss_conf *link_conf;
747
748 rcu_read_lock();
749 link_conf = rcu_dereference(vif->link_conf[link_id]);
750
751 if (!WARN_ON_ONCE(!link_conf || !link_conf->mu_mimo_owner)) {
752 memcpy(to: link_conf->mu_group.membership, from: membership,
753 WLAN_MEMBERSHIP_LEN);
754 memcpy(to: link_conf->mu_group.position, from: position,
755 WLAN_USER_POSITION_LEN);
756 }
757 rcu_read_unlock();
758}
759EXPORT_SYMBOL_GPL(ieee80211_update_mu_groups);
760
761void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
762 struct link_sta_info *link_sta,
763 u8 opmode, enum nl80211_band band)
764{
765 struct ieee80211_local *local = sdata->local;
766 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
767
768 u32 changed = __ieee80211_vht_handle_opmode(sdata, link_sta,
769 opmode, band);
770
771 if (changed > 0) {
772 ieee80211_recalc_min_chandef(sdata, link_id: link_sta->link_id);
773 rate_control_rate_update(local, sband, link_sta, changed);
774 }
775}
776
777void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
778 u16 vht_mask[NL80211_VHT_NSS_MAX])
779{
780 int i;
781 u16 mask, cap = le16_to_cpu(vht_cap);
782
783 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) {
784 mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
785 switch (mask) {
786 case IEEE80211_VHT_MCS_SUPPORT_0_7:
787 vht_mask[i] = 0x00FF;
788 break;
789 case IEEE80211_VHT_MCS_SUPPORT_0_8:
790 vht_mask[i] = 0x01FF;
791 break;
792 case IEEE80211_VHT_MCS_SUPPORT_0_9:
793 vht_mask[i] = 0x03FF;
794 break;
795 case IEEE80211_VHT_MCS_NOT_SUPPORTED:
796 default:
797 vht_mask[i] = 0;
798 break;
799 }
800 }
801}
802