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 - 2023 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
__check_vhtcap_disable(struct ieee80211_sub_if_data * sdata,struct ieee80211_sta_vht_cap * vht_cap,u32 flag)17 static 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
ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data * sdata,struct ieee80211_sta_vht_cap * vht_cap)28 void 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
115 void
ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data * sdata,struct ieee80211_supported_band * sband,const struct ieee80211_vht_cap * vht_cap_ie,const struct ieee80211_vht_cap * vht_cap_ie2,struct link_sta_info * link_sta)116 ieee80211_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(vht_cap, 0, 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(link_sta->sta, WLAN_STA_TDLS_PEER))
168 ieee80211_apply_vhtcap_overrides(sdata, &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(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
232 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 * spacial 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 spactial 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(&link_sta->sta->sta);
350 }
351
352 /* FIXME: move this to some better location - parses HE/EHT now */
353 enum ieee80211_sta_rx_bandwidth
ieee80211_sta_cap_rx_bw(struct link_sta_info * link_sta)354 ieee80211_sta_cap_rx_bw(struct link_sta_info *link_sta)
355 {
356 unsigned int link_id = link_sta->link_id;
357 struct ieee80211_sub_if_data *sdata = link_sta->sta->sdata;
358 struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
359 struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
360 struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
361 u32 cap_width;
362
363 if (he_cap->has_he) {
364 struct ieee80211_bss_conf *link_conf;
365 enum ieee80211_sta_rx_bandwidth ret;
366 u8 info;
367
368 rcu_read_lock();
369 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
370
371 if (eht_cap->has_eht &&
372 link_conf->chandef.chan->band == NL80211_BAND_6GHZ) {
373 info = eht_cap->eht_cap_elem.phy_cap_info[0];
374
375 if (info & IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) {
376 ret = IEEE80211_STA_RX_BW_320;
377 goto out;
378 }
379 }
380
381 info = he_cap->he_cap_elem.phy_cap_info[0];
382
383 if (link_conf->chandef.chan->band == NL80211_BAND_2GHZ) {
384 if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G)
385 ret = IEEE80211_STA_RX_BW_40;
386 else
387 ret = IEEE80211_STA_RX_BW_20;
388 goto out;
389 }
390
391 if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G ||
392 info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G)
393 ret = IEEE80211_STA_RX_BW_160;
394 else if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)
395 ret = IEEE80211_STA_RX_BW_80;
396 else
397 ret = IEEE80211_STA_RX_BW_20;
398 out:
399 rcu_read_unlock();
400
401 return ret;
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
426 enum nl80211_chan_width
ieee80211_sta_cap_chan_bw(struct link_sta_info * link_sta)427 ieee80211_sta_cap_chan_bw(struct link_sta_info *link_sta)
428 {
429 struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
430 u32 cap_width;
431
432 if (!vht_cap->vht_supported) {
433 if (!link_sta->pub->ht_cap.ht_supported)
434 return NL80211_CHAN_WIDTH_20_NOHT;
435
436 return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
437 NL80211_CHAN_WIDTH_40 : NL80211_CHAN_WIDTH_20;
438 }
439
440 cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
441
442 if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
443 return NL80211_CHAN_WIDTH_160;
444 else if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
445 return NL80211_CHAN_WIDTH_80P80;
446
447 return NL80211_CHAN_WIDTH_80;
448 }
449
450 enum nl80211_chan_width
ieee80211_sta_rx_bw_to_chan_width(struct link_sta_info * link_sta)451 ieee80211_sta_rx_bw_to_chan_width(struct link_sta_info *link_sta)
452 {
453 enum ieee80211_sta_rx_bandwidth cur_bw =
454 link_sta->pub->bandwidth;
455 struct ieee80211_sta_vht_cap *vht_cap =
456 &link_sta->pub->vht_cap;
457 u32 cap_width;
458
459 switch (cur_bw) {
460 case IEEE80211_STA_RX_BW_20:
461 if (!link_sta->pub->ht_cap.ht_supported)
462 return NL80211_CHAN_WIDTH_20_NOHT;
463 else
464 return NL80211_CHAN_WIDTH_20;
465 case IEEE80211_STA_RX_BW_40:
466 return NL80211_CHAN_WIDTH_40;
467 case IEEE80211_STA_RX_BW_80:
468 return NL80211_CHAN_WIDTH_80;
469 case IEEE80211_STA_RX_BW_160:
470 cap_width =
471 vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
472
473 if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
474 return NL80211_CHAN_WIDTH_160;
475
476 return NL80211_CHAN_WIDTH_80P80;
477 default:
478 return NL80211_CHAN_WIDTH_20;
479 }
480 }
481
482 enum ieee80211_sta_rx_bandwidth
ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width)483 ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width)
484 {
485 switch (width) {
486 case NL80211_CHAN_WIDTH_20_NOHT:
487 case NL80211_CHAN_WIDTH_20:
488 return IEEE80211_STA_RX_BW_20;
489 case NL80211_CHAN_WIDTH_40:
490 return IEEE80211_STA_RX_BW_40;
491 case NL80211_CHAN_WIDTH_80:
492 return IEEE80211_STA_RX_BW_80;
493 case NL80211_CHAN_WIDTH_160:
494 case NL80211_CHAN_WIDTH_80P80:
495 return IEEE80211_STA_RX_BW_160;
496 case NL80211_CHAN_WIDTH_320:
497 return IEEE80211_STA_RX_BW_320;
498 default:
499 WARN_ON_ONCE(1);
500 return IEEE80211_STA_RX_BW_20;
501 }
502 }
503
504 /* FIXME: rename/move - this deals with everything not just VHT */
505 enum ieee80211_sta_rx_bandwidth
ieee80211_sta_cur_vht_bw(struct link_sta_info * link_sta)506 ieee80211_sta_cur_vht_bw(struct link_sta_info *link_sta)
507 {
508 struct sta_info *sta = link_sta->sta;
509 struct ieee80211_bss_conf *link_conf;
510 enum nl80211_chan_width bss_width;
511 enum ieee80211_sta_rx_bandwidth bw;
512
513 rcu_read_lock();
514 link_conf = rcu_dereference(sta->sdata->vif.link_conf[link_sta->link_id]);
515 if (WARN_ON(!link_conf))
516 bss_width = NL80211_CHAN_WIDTH_20_NOHT;
517 else
518 bss_width = link_conf->chandef.width;
519 rcu_read_unlock();
520
521 bw = ieee80211_sta_cap_rx_bw(link_sta);
522 bw = min(bw, link_sta->cur_max_bandwidth);
523
524 /* Don't consider AP's bandwidth for TDLS peers, section 11.23.1 of
525 * IEEE80211-2016 specification makes higher bandwidth operation
526 * possible on the TDLS link if the peers have wider bandwidth
527 * capability.
528 *
529 * However, in this case, and only if the TDLS peer is authorized,
530 * limit to the tdls_chandef so that the configuration here isn't
531 * wider than what's actually requested on the channel context.
532 */
533 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
534 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) &&
535 test_sta_flag(sta, WLAN_STA_AUTHORIZED) &&
536 sta->tdls_chandef.chan)
537 bw = min(bw, ieee80211_chan_width_to_rx_bw(sta->tdls_chandef.width));
538 else
539 bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));
540
541 return bw;
542 }
543
ieee80211_sta_set_rx_nss(struct link_sta_info * link_sta)544 void ieee80211_sta_set_rx_nss(struct link_sta_info *link_sta)
545 {
546 u8 ht_rx_nss = 0, vht_rx_nss = 0, he_rx_nss = 0, eht_rx_nss = 0, rx_nss;
547 bool support_160;
548
549 /* if we received a notification already don't overwrite it */
550 if (link_sta->pub->rx_nss)
551 return;
552
553 if (link_sta->pub->eht_cap.has_eht) {
554 int i;
555 const u8 *rx_nss_mcs = (void *)&link_sta->pub->eht_cap.eht_mcs_nss_supp;
556
557 /* get the max nss for EHT over all possible bandwidths and mcs */
558 for (i = 0; i < sizeof(struct ieee80211_eht_mcs_nss_supp); i++)
559 eht_rx_nss = max_t(u8, eht_rx_nss,
560 u8_get_bits(rx_nss_mcs[i],
561 IEEE80211_EHT_MCS_NSS_RX));
562 }
563
564 if (link_sta->pub->he_cap.has_he) {
565 int i;
566 u8 rx_mcs_80 = 0, rx_mcs_160 = 0;
567 const struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
568 u16 mcs_160_map =
569 le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_160);
570 u16 mcs_80_map = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_80);
571
572 for (i = 7; i >= 0; i--) {
573 u8 mcs_160 = (mcs_160_map >> (2 * i)) & 3;
574
575 if (mcs_160 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
576 rx_mcs_160 = i + 1;
577 break;
578 }
579 }
580 for (i = 7; i >= 0; i--) {
581 u8 mcs_80 = (mcs_80_map >> (2 * i)) & 3;
582
583 if (mcs_80 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
584 rx_mcs_80 = i + 1;
585 break;
586 }
587 }
588
589 support_160 = he_cap->he_cap_elem.phy_cap_info[0] &
590 IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
591
592 if (support_160)
593 he_rx_nss = min(rx_mcs_80, rx_mcs_160);
594 else
595 he_rx_nss = rx_mcs_80;
596 }
597
598 if (link_sta->pub->ht_cap.ht_supported) {
599 if (link_sta->pub->ht_cap.mcs.rx_mask[0])
600 ht_rx_nss++;
601 if (link_sta->pub->ht_cap.mcs.rx_mask[1])
602 ht_rx_nss++;
603 if (link_sta->pub->ht_cap.mcs.rx_mask[2])
604 ht_rx_nss++;
605 if (link_sta->pub->ht_cap.mcs.rx_mask[3])
606 ht_rx_nss++;
607 /* FIXME: consider rx_highest? */
608 }
609
610 if (link_sta->pub->vht_cap.vht_supported) {
611 int i;
612 u16 rx_mcs_map;
613
614 rx_mcs_map = le16_to_cpu(link_sta->pub->vht_cap.vht_mcs.rx_mcs_map);
615
616 for (i = 7; i >= 0; i--) {
617 u8 mcs = (rx_mcs_map >> (2 * i)) & 3;
618
619 if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
620 vht_rx_nss = i + 1;
621 break;
622 }
623 }
624 /* FIXME: consider rx_highest? */
625 }
626
627 rx_nss = max(vht_rx_nss, ht_rx_nss);
628 rx_nss = max(he_rx_nss, rx_nss);
629 rx_nss = max(eht_rx_nss, rx_nss);
630 link_sta->pub->rx_nss = max_t(u8, 1, rx_nss);
631 }
632
__ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data * sdata,struct link_sta_info * link_sta,u8 opmode,enum nl80211_band band)633 u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
634 struct link_sta_info *link_sta,
635 u8 opmode, enum nl80211_band band)
636 {
637 enum ieee80211_sta_rx_bandwidth new_bw;
638 struct sta_opmode_info sta_opmode = {};
639 u32 changed = 0;
640 u8 nss, cur_nss;
641
642 /* ignore - no support for BF yet */
643 if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
644 return 0;
645
646 nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
647 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
648 nss += 1;
649
650 if (link_sta->pub->rx_nss != nss) {
651 cur_nss = link_sta->pub->rx_nss;
652 /* Reset rx_nss and call ieee80211_sta_set_rx_nss() which
653 * will set the same to max nss value calculated based on capability.
654 */
655 link_sta->pub->rx_nss = 0;
656 ieee80211_sta_set_rx_nss(link_sta);
657 /* Do not allow an nss change to rx_nss greater than max_nss
658 * negotiated and capped to APs capability during association.
659 */
660 if (nss <= link_sta->pub->rx_nss) {
661 link_sta->pub->rx_nss = nss;
662 sta_opmode.rx_nss = nss;
663 changed |= IEEE80211_RC_NSS_CHANGED;
664 sta_opmode.changed |= STA_OPMODE_N_SS_CHANGED;
665 } else {
666 link_sta->pub->rx_nss = cur_nss;
667 pr_warn_ratelimited("Ignoring NSS change in VHT Operating Mode Notification from %pM with invalid nss %d",
668 link_sta->pub->addr, nss);
669 }
670 }
671
672 switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
673 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
674 /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
675 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
676 break;
677 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
678 /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
679 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
680 break;
681 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
682 if (opmode & IEEE80211_OPMODE_NOTIF_BW_160_80P80)
683 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
684 else
685 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
686 break;
687 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
688 /* legacy only, no longer used by newer spec */
689 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
690 break;
691 }
692
693 new_bw = ieee80211_sta_cur_vht_bw(link_sta);
694 if (new_bw != link_sta->pub->bandwidth) {
695 link_sta->pub->bandwidth = new_bw;
696 sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(link_sta);
697 changed |= IEEE80211_RC_BW_CHANGED;
698 sta_opmode.changed |= STA_OPMODE_MAX_BW_CHANGED;
699 }
700
701 if (sta_opmode.changed)
702 cfg80211_sta_opmode_change_notify(sdata->dev, link_sta->addr,
703 &sta_opmode, GFP_KERNEL);
704
705 return changed;
706 }
707
ieee80211_process_mu_groups(struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link,struct ieee80211_mgmt * mgmt)708 void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
709 struct ieee80211_link_data *link,
710 struct ieee80211_mgmt *mgmt)
711 {
712 struct ieee80211_bss_conf *link_conf = link->conf;
713
714 if (!link_conf->mu_mimo_owner)
715 return;
716
717 if (!memcmp(mgmt->u.action.u.vht_group_notif.position,
718 link_conf->mu_group.position, WLAN_USER_POSITION_LEN) &&
719 !memcmp(mgmt->u.action.u.vht_group_notif.membership,
720 link_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN))
721 return;
722
723 memcpy(link_conf->mu_group.membership,
724 mgmt->u.action.u.vht_group_notif.membership,
725 WLAN_MEMBERSHIP_LEN);
726 memcpy(link_conf->mu_group.position,
727 mgmt->u.action.u.vht_group_notif.position,
728 WLAN_USER_POSITION_LEN);
729
730 ieee80211_link_info_change_notify(sdata, link,
731 BSS_CHANGED_MU_GROUPS);
732 }
733
ieee80211_update_mu_groups(struct ieee80211_vif * vif,unsigned int link_id,const u8 * membership,const u8 * position)734 void ieee80211_update_mu_groups(struct ieee80211_vif *vif, unsigned int link_id,
735 const u8 *membership, const u8 *position)
736 {
737 struct ieee80211_bss_conf *link_conf;
738
739 rcu_read_lock();
740 link_conf = rcu_dereference(vif->link_conf[link_id]);
741
742 if (!WARN_ON_ONCE(!link_conf || !link_conf->mu_mimo_owner)) {
743 memcpy(link_conf->mu_group.membership, membership,
744 WLAN_MEMBERSHIP_LEN);
745 memcpy(link_conf->mu_group.position, position,
746 WLAN_USER_POSITION_LEN);
747 }
748 rcu_read_unlock();
749 }
750 EXPORT_SYMBOL_GPL(ieee80211_update_mu_groups);
751
ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data * sdata,struct link_sta_info * link_sta,u8 opmode,enum nl80211_band band)752 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
753 struct link_sta_info *link_sta,
754 u8 opmode, enum nl80211_band band)
755 {
756 struct ieee80211_local *local = sdata->local;
757 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
758
759 u32 changed = __ieee80211_vht_handle_opmode(sdata, link_sta,
760 opmode, band);
761
762 if (changed > 0) {
763 ieee80211_recalc_min_chandef(sdata, link_sta->link_id);
764 rate_control_rate_update(local, sband, link_sta->sta,
765 link_sta->link_id, changed);
766 }
767 }
768
ieee80211_get_vht_mask_from_cap(__le16 vht_cap,u16 vht_mask[NL80211_VHT_NSS_MAX])769 void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
770 u16 vht_mask[NL80211_VHT_NSS_MAX])
771 {
772 int i;
773 u16 mask, cap = le16_to_cpu(vht_cap);
774
775 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) {
776 mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
777 switch (mask) {
778 case IEEE80211_VHT_MCS_SUPPORT_0_7:
779 vht_mask[i] = 0x00FF;
780 break;
781 case IEEE80211_VHT_MCS_SUPPORT_0_8:
782 vht_mask[i] = 0x01FF;
783 break;
784 case IEEE80211_VHT_MCS_SUPPORT_0_9:
785 vht_mask[i] = 0x03FF;
786 break;
787 case IEEE80211_VHT_MCS_NOT_SUPPORTED:
788 default:
789 vht_mask[i] = 0;
790 break;
791 }
792 }
793 }
794
