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 - 2026 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 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 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 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_sta_vht_cap *own_vht_cap, 119 const struct ieee80211_vht_cap *vht_cap_ie, 120 const struct ieee80211_vht_cap *vht_cap_ie2, 121 struct link_sta_info *link_sta) 122 { 123 struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap; 124 struct ieee80211_sta_vht_cap own_cap; 125 u32 cap_info, i; 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 || !own_vht_cap->vht_supported) 134 return; 135 136 /* NDI station are using the capabilities from the NMI station */ 137 if (WARN_ON_ONCE(sdata->vif.type == NL80211_IFTYPE_NAN_DATA)) 138 return; 139 140 if (sband) { 141 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 142 bool have_80mhz = false; 143 144 for (i = 0; i < sband->n_channels; i++) { 145 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 146 IEEE80211_CHAN_NO_80MHZ)) 147 continue; 148 149 have_80mhz = true; 150 break; 151 } 152 153 if (!have_80mhz) 154 return; 155 } 156 157 /* 158 * A VHT STA must support 40 MHz, but if we verify that here 159 * then we break a few things - some APs (e.g. Netgear R6300v2 160 * and others based on the BCM4360 chipset) will unset this 161 * capability bit when operating in 20 MHz. 162 */ 163 164 vht_cap->vht_supported = true; 165 166 own_cap = *own_vht_cap; 167 /* 168 * If user has specified capability overrides, take care 169 * of that if the station we're setting up is the AP that 170 * we advertised a restricted capability set to. Override 171 * our own capabilities and then use those below. 172 */ 173 if (sdata->vif.type == NL80211_IFTYPE_STATION && 174 !test_sta_flag(link_sta->sta, WLAN_STA_TDLS_PEER)) 175 ieee80211_apply_vhtcap_overrides(sdata, &own_cap); 176 177 /* take some capabilities as-is */ 178 cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info); 179 vht_cap->cap = cap_info; 180 vht_cap->cap &= IEEE80211_VHT_CAP_RXLDPC | 181 IEEE80211_VHT_CAP_VHT_TXOP_PS | 182 IEEE80211_VHT_CAP_HTC_VHT | 183 IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK | 184 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB | 185 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB | 186 IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN | 187 IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN; 188 189 vht_cap->cap |= min_t(u32, cap_info & IEEE80211_VHT_CAP_MAX_MPDU_MASK, 190 own_cap.cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK); 191 192 /* and some based on our own capabilities */ 193 switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 194 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 195 vht_cap->cap |= cap_info & 196 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 197 break; 198 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 199 vht_cap->cap |= cap_info & 200 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 201 break; 202 default: 203 /* nothing */ 204 break; 205 } 206 207 /* symmetric capabilities */ 208 vht_cap->cap |= cap_info & own_cap.cap & 209 (IEEE80211_VHT_CAP_SHORT_GI_80 | 210 IEEE80211_VHT_CAP_SHORT_GI_160); 211 212 /* remaining ones */ 213 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE) 214 vht_cap->cap |= cap_info & 215 (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | 216 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK); 217 218 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE) 219 vht_cap->cap |= cap_info & 220 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 221 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK); 222 223 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE) 224 vht_cap->cap |= cap_info & 225 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 226 227 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) 228 vht_cap->cap |= cap_info & 229 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE; 230 231 if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC) 232 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK; 233 234 if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK) 235 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC; 236 237 /* Copy peer MCS info, the driver might need them. */ 238 memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, 239 sizeof(struct ieee80211_vht_mcs_info)); 240 241 /* copy EXT_NSS_BW Support value or remove the capability */ 242 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW)) 243 vht_cap->cap |= (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK); 244 else 245 vht_cap->vht_mcs.tx_highest &= 246 ~cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE); 247 248 /* but also restrict MCSes */ 249 for (i = 0; i < 8; i++) { 250 u16 own_rx, own_tx, peer_rx, peer_tx; 251 252 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map); 253 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 254 255 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map); 256 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 257 258 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); 259 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 260 261 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); 262 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 263 264 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 265 if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 266 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 267 else if (own_rx < peer_tx) 268 peer_tx = own_rx; 269 } 270 271 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 272 if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 273 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 274 else if (own_tx < peer_rx) 275 peer_rx = own_tx; 276 } 277 278 vht_cap->vht_mcs.rx_mcs_map &= 279 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 280 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2); 281 282 vht_cap->vht_mcs.tx_mcs_map &= 283 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 284 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2); 285 } 286 287 /* 288 * This is a workaround for VHT-enabled STAs which break the spec 289 * and have the VHT-MCS Rx map filled in with value 3 for all eight 290 * spatial streams, an example is AR9462. 291 * 292 * As per spec, in section 22.1.1 Introduction to the VHT PHY 293 * A VHT STA shall support at least single spatial stream VHT-MCSs 294 * 0 to 7 (transmit and receive) in all supported channel widths. 295 */ 296 if (vht_cap->vht_mcs.rx_mcs_map == cpu_to_le16(0xFFFF)) { 297 vht_cap->vht_supported = false; 298 sdata_info(sdata, 299 "Ignoring VHT IE from %pM (link:%pM) due to invalid rx_mcs_map\n", 300 link_sta->sta->addr, link_sta->addr); 301 return; 302 } 303 304 /* 305 * Work around the Cisco 9115 FW 17.3 bug by taking the min of 306 * both reported MPDU lengths. 307 */ 308 mpdu_len = vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK; 309 if (vht_cap_ie2) 310 mpdu_len = min_t(u32, mpdu_len, 311 le32_get_bits(vht_cap_ie2->vht_cap_info, 312 IEEE80211_VHT_CAP_MAX_MPDU_MASK)); 313 314 /* 315 * FIXME - should the amsdu len be per link? store per link 316 * and maintain a minimum? 317 */ 318 switch (mpdu_len) { 319 case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454: 320 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454; 321 break; 322 case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991: 323 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991; 324 break; 325 case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895: 326 default: 327 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895; 328 break; 329 } 330 331 ieee80211_sta_recalc_aggregates(&link_sta->sta->sta); 332 } 333 334 u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 335 struct link_sta_info *link_sta, 336 u8 opmode, enum nl80211_band band) 337 { 338 enum ieee80211_sta_rx_bandwidth new_bw; 339 struct sta_opmode_info sta_opmode = {}; 340 struct ieee80211_link_data *link; 341 u32 changed = 0; 342 u8 nss; 343 344 link = sdata_dereference(sdata->link[link_sta->link_id], sdata); 345 if (WARN_ON(!link)) 346 return 0; 347 348 /* ignore - no support for BF yet */ 349 if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) 350 return 0; 351 352 nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 353 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 354 nss += 1; 355 356 if (link_sta->op_mode_nss != nss) { 357 if (nss <= link_sta->capa_nss) { 358 link_sta->op_mode_nss = nss; 359 360 if (nss != link_sta->pub->rx_nss) { 361 link_sta->pub->rx_nss = nss; 362 changed |= IEEE80211_RC_NSS_CHANGED; 363 sta_opmode.rx_nss = link_sta->pub->rx_nss; 364 sta_opmode.changed |= STA_OPMODE_N_SS_CHANGED; 365 } 366 } else { 367 sdata_dbg(sdata, 368 "Ignore NSS change to invalid %d in VHT opmode notif from %pM", 369 nss, link_sta->pub->addr); 370 } 371 } 372 373 switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { 374 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: 375 /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */ 376 link_sta->op_mode_bw = IEEE80211_STA_RX_BW_20; 377 break; 378 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: 379 /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */ 380 link_sta->op_mode_bw = IEEE80211_STA_RX_BW_40; 381 break; 382 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: 383 if (opmode & IEEE80211_OPMODE_NOTIF_BW_160_80P80) 384 link_sta->op_mode_bw = IEEE80211_STA_RX_BW_160; 385 else 386 link_sta->op_mode_bw = IEEE80211_STA_RX_BW_80; 387 break; 388 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: 389 /* legacy only, no longer used by newer spec */ 390 link_sta->op_mode_bw = IEEE80211_STA_RX_BW_160; 391 break; 392 } 393 394 new_bw = ieee80211_sta_current_bw(link_sta, &link->conf->chanreq.oper, 395 IEEE80211_STA_BW_TX_TO_STA); 396 if (new_bw != link_sta->pub->bandwidth) { 397 link_sta->pub->bandwidth = new_bw; 398 sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(new_bw); 399 changed |= IEEE80211_RC_BW_CHANGED; 400 sta_opmode.changed |= STA_OPMODE_MAX_BW_CHANGED; 401 } 402 403 if (sta_opmode.changed) 404 cfg80211_sta_opmode_change_notify(sdata->dev, link_sta->addr, 405 &sta_opmode, GFP_KERNEL); 406 407 return changed; 408 } 409 410 void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata, 411 struct ieee80211_link_data *link, 412 struct ieee80211_mgmt *mgmt) 413 { 414 struct ieee80211_bss_conf *link_conf = link->conf; 415 416 if (!link_conf->mu_mimo_owner) 417 return; 418 419 if (!memcmp(mgmt->u.action.vht_group_notif.position, 420 link_conf->mu_group.position, WLAN_USER_POSITION_LEN) && 421 !memcmp(mgmt->u.action.vht_group_notif.membership, 422 link_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN)) 423 return; 424 425 memcpy(link_conf->mu_group.membership, 426 mgmt->u.action.vht_group_notif.membership, 427 WLAN_MEMBERSHIP_LEN); 428 memcpy(link_conf->mu_group.position, 429 mgmt->u.action.vht_group_notif.position, 430 WLAN_USER_POSITION_LEN); 431 432 ieee80211_link_info_change_notify(sdata, link, 433 BSS_CHANGED_MU_GROUPS); 434 } 435 436 void ieee80211_update_mu_groups(struct ieee80211_vif *vif, unsigned int link_id, 437 const u8 *membership, const u8 *position) 438 { 439 struct ieee80211_bss_conf *link_conf; 440 441 rcu_read_lock(); 442 link_conf = rcu_dereference(vif->link_conf[link_id]); 443 444 if (!WARN_ON_ONCE(!link_conf || !link_conf->mu_mimo_owner)) { 445 memcpy(link_conf->mu_group.membership, membership, 446 WLAN_MEMBERSHIP_LEN); 447 memcpy(link_conf->mu_group.position, position, 448 WLAN_USER_POSITION_LEN); 449 } 450 rcu_read_unlock(); 451 } 452 EXPORT_SYMBOL_GPL(ieee80211_update_mu_groups); 453 454 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 455 struct link_sta_info *link_sta, 456 u8 opmode, enum nl80211_band band) 457 { 458 struct ieee80211_local *local = sdata->local; 459 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 460 461 u32 changed = __ieee80211_vht_handle_opmode(sdata, link_sta, 462 opmode, band); 463 464 if (changed > 0) { 465 ieee80211_recalc_min_chandef(sdata, link_sta->link_id); 466 rate_control_rate_update(local, sband, link_sta, changed); 467 } 468 } 469 470 void ieee80211_get_vht_mask_from_cap(__le16 vht_cap, 471 u16 vht_mask[NL80211_VHT_NSS_MAX]) 472 { 473 int i; 474 u16 mask, cap = le16_to_cpu(vht_cap); 475 476 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) { 477 mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 478 switch (mask) { 479 case IEEE80211_VHT_MCS_SUPPORT_0_7: 480 vht_mask[i] = 0x00FF; 481 break; 482 case IEEE80211_VHT_MCS_SUPPORT_0_8: 483 vht_mask[i] = 0x01FF; 484 break; 485 case IEEE80211_VHT_MCS_SUPPORT_0_9: 486 vht_mask[i] = 0x03FF; 487 break; 488 case IEEE80211_VHT_MCS_NOT_SUPPORTED: 489 default: 490 vht_mask[i] = 0; 491 break; 492 } 493 } 494 } 495