1/* 2 * VHT handling 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9#include <linux/ieee80211.h> 10#include <linux/export.h> 11#include <net/mac80211.h> 12#include "ieee80211_i.h" 13#include "rate.h" 14 15 16static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata, 17 struct ieee80211_sta_vht_cap *vht_cap, 18 u32 flag) 19{ 20 __le32 le_flag = cpu_to_le32(flag); 21 22 if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag && 23 !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag)) 24 vht_cap->cap &= ~flag; 25} 26 27void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata, 28 struct ieee80211_sta_vht_cap *vht_cap) 29{ 30 int i; 31 u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n; 32 33 if (!vht_cap->vht_supported) 34 return; 35 36 if (sdata->vif.type != NL80211_IFTYPE_STATION) 37 return; 38 39 __check_vhtcap_disable(sdata, vht_cap, 40 IEEE80211_VHT_CAP_RXLDPC); 41 __check_vhtcap_disable(sdata, vht_cap, 42 IEEE80211_VHT_CAP_SHORT_GI_80); 43 __check_vhtcap_disable(sdata, vht_cap, 44 IEEE80211_VHT_CAP_SHORT_GI_160); 45 __check_vhtcap_disable(sdata, vht_cap, 46 IEEE80211_VHT_CAP_TXSTBC); 47 __check_vhtcap_disable(sdata, vht_cap, 48 IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE); 49 __check_vhtcap_disable(sdata, vht_cap, 50 IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE); 51 __check_vhtcap_disable(sdata, vht_cap, 52 IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN); 53 __check_vhtcap_disable(sdata, vht_cap, 54 IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN); 55 56 /* Allow user to decrease AMPDU length exponent */ 57 if (sdata->u.mgd.vht_capa_mask.vht_cap_info & 58 cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) { 59 u32 cap, n; 60 61 n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) & 62 IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; 63 n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; 64 cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; 65 cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; 66 67 if (n < cap) { 68 vht_cap->cap &= 69 ~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; 70 vht_cap->cap |= 71 n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; 72 } 73 } 74 75 /* Allow the user to decrease MCSes */ 76 rxmcs_mask = 77 le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map); 78 rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map); 79 rxmcs_n &= rxmcs_mask; 80 rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); 81 82 txmcs_mask = 83 le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map); 84 txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map); 85 txmcs_n &= txmcs_mask; 86 txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); 87 for (i = 0; i < 8; i++) { 88 u8 m, n, c; 89 90 m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 91 n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 92 c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 93 94 if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) || 95 n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) { 96 rxmcs_cap &= ~(3 << 2*i); 97 rxmcs_cap |= (rxmcs_n & (3 << 2*i)); 98 } 99 100 m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 101 n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 102 c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 103 104 if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) || 105 n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) { 106 txmcs_cap &= ~(3 << 2*i); 107 txmcs_cap |= (txmcs_n & (3 << 2*i)); 108 } 109 } 110 vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap); 111 vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap); 112} 113 114void 115ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata, 116 struct ieee80211_supported_band *sband, 117 const struct ieee80211_vht_cap *vht_cap_ie, 118 struct sta_info *sta) 119{ 120 struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap; 121 struct ieee80211_sta_vht_cap own_cap; 122 u32 cap_info, i; 123 bool have_80mhz; 124 125 memset(vht_cap, 0, sizeof(*vht_cap)); 126 127 if (!sta->sta.ht_cap.ht_supported) 128 return; 129 130 if (!vht_cap_ie || !sband->vht_cap.vht_supported) 131 return; 132 133 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 134 have_80mhz = false; 135 for (i = 0; i < sband->n_channels; i++) { 136 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 137 IEEE80211_CHAN_NO_80MHZ)) 138 continue; 139 140 have_80mhz = true; 141 break; 142 } 143 144 if (!have_80mhz) 145 return; 146 147 /* 148 * A VHT STA must support 40 MHz, but if we verify that here 149 * then we break a few things - some APs (e.g. Netgear R6300v2 150 * and others based on the BCM4360 chipset) will unset this 151 * capability bit when operating in 20 MHz. 152 */ 153 154 vht_cap->vht_supported = true; 155 156 own_cap = sband->vht_cap; 157 /* 158 * If user has specified capability overrides, take care 159 * of that if the station we're setting up is the AP that 160 * we advertised a restricted capability set to. Override 161 * our own capabilities and then use those below. 162 */ 163 if (sdata->vif.type == NL80211_IFTYPE_STATION && 164 !test_sta_flag(sta, WLAN_STA_TDLS_PEER)) 165 ieee80211_apply_vhtcap_overrides(sdata, &own_cap); 166 167 /* take some capabilities as-is */ 168 cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info); 169 vht_cap->cap = cap_info; 170 vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 | 171 IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 | 172 IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 | 173 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 /* and some based on our own capabilities */ 183 switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 184 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 185 vht_cap->cap |= cap_info & 186 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 187 break; 188 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 189 vht_cap->cap |= cap_info & 190 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 191 break; 192 default: 193 /* nothing */ 194 break; 195 } 196 197 /* symmetric capabilities */ 198 vht_cap->cap |= cap_info & own_cap.cap & 199 (IEEE80211_VHT_CAP_SHORT_GI_80 | 200 IEEE80211_VHT_CAP_SHORT_GI_160); 201 202 /* remaining ones */ 203 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE) 204 vht_cap->cap |= cap_info & 205 (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | 206 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK); 207 208 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE) 209 vht_cap->cap |= cap_info & 210 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 211 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK); 212 213 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE) 214 vht_cap->cap |= cap_info & 215 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 216 217 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) 218 vht_cap->cap |= cap_info & 219 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE; 220 221 if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC) 222 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK; 223 224 if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK) 225 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC; 226 227 /* Copy peer MCS info, the driver might need them. */ 228 memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, 229 sizeof(struct ieee80211_vht_mcs_info)); 230 231 /* but also restrict MCSes */ 232 for (i = 0; i < 8; i++) { 233 u16 own_rx, own_tx, peer_rx, peer_tx; 234 235 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map); 236 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 237 238 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map); 239 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 240 241 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); 242 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 243 244 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); 245 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 246 247 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 248 if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 249 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 250 else if (own_rx < peer_tx) 251 peer_tx = own_rx; 252 } 253 254 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 255 if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 256 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 257 else if (own_tx < peer_rx) 258 peer_rx = own_tx; 259 } 260 261 vht_cap->vht_mcs.rx_mcs_map &= 262 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 263 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2); 264 265 vht_cap->vht_mcs.tx_mcs_map &= 266 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 267 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2); 268 } 269 270 /* finally set up the bandwidth */ 271 switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 272 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 273 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 274 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 275 break; 276 default: 277 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 278 } 279 280 sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); 281} 282 283enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta) 284{ 285 struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap; 286 u32 cap_width; 287 288 if (!vht_cap->vht_supported) 289 return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 290 IEEE80211_STA_RX_BW_40 : 291 IEEE80211_STA_RX_BW_20; 292 293 cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 294 295 if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ || 296 cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 297 return IEEE80211_STA_RX_BW_160; 298 299 return IEEE80211_STA_RX_BW_80; 300} 301 302static enum ieee80211_sta_rx_bandwidth 303ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width) 304{ 305 switch (width) { 306 case NL80211_CHAN_WIDTH_20_NOHT: 307 case NL80211_CHAN_WIDTH_20: 308 return IEEE80211_STA_RX_BW_20; 309 case NL80211_CHAN_WIDTH_40: 310 return IEEE80211_STA_RX_BW_40; 311 case NL80211_CHAN_WIDTH_80: 312 return IEEE80211_STA_RX_BW_80; 313 case NL80211_CHAN_WIDTH_160: 314 case NL80211_CHAN_WIDTH_80P80: 315 return IEEE80211_STA_RX_BW_160; 316 default: 317 WARN_ON_ONCE(1); 318 return IEEE80211_STA_RX_BW_20; 319 } 320} 321 322enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) 323{ 324 struct ieee80211_sub_if_data *sdata = sta->sdata; 325 enum ieee80211_sta_rx_bandwidth bw; 326 enum nl80211_chan_width bss_width = sdata->vif.bss_conf.chandef.width; 327 328 bw = ieee80211_sta_cap_rx_bw(sta); 329 bw = min(bw, sta->cur_max_bandwidth); 330 331 /* do not cap the BW of TDLS WIDER_BW peers by the bss */ 332 if (!test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 333 bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width)); 334 335 return bw; 336} 337 338void ieee80211_sta_set_rx_nss(struct sta_info *sta) 339{ 340 u8 ht_rx_nss = 0, vht_rx_nss = 0; 341 342 /* if we received a notification already don't overwrite it */ 343 if (sta->sta.rx_nss) 344 return; 345 346 if (sta->sta.ht_cap.ht_supported) { 347 if (sta->sta.ht_cap.mcs.rx_mask[0]) 348 ht_rx_nss++; 349 if (sta->sta.ht_cap.mcs.rx_mask[1]) 350 ht_rx_nss++; 351 if (sta->sta.ht_cap.mcs.rx_mask[2]) 352 ht_rx_nss++; 353 if (sta->sta.ht_cap.mcs.rx_mask[3]) 354 ht_rx_nss++; 355 /* FIXME: consider rx_highest? */ 356 } 357 358 if (sta->sta.vht_cap.vht_supported) { 359 int i; 360 u16 rx_mcs_map; 361 362 rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); 363 364 for (i = 7; i >= 0; i--) { 365 u8 mcs = (rx_mcs_map >> (2 * i)) & 3; 366 367 if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 368 vht_rx_nss = i + 1; 369 break; 370 } 371 } 372 /* FIXME: consider rx_highest? */ 373 } 374 375 ht_rx_nss = max(ht_rx_nss, vht_rx_nss); 376 sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); 377} 378 379u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 380 struct sta_info *sta, u8 opmode, 381 enum ieee80211_band band) 382{ 383 struct ieee80211_local *local = sdata->local; 384 struct ieee80211_supported_band *sband; 385 enum ieee80211_sta_rx_bandwidth new_bw; 386 u32 changed = 0; 387 u8 nss; 388 389 sband = local->hw.wiphy->bands[band]; 390 391 /* ignore - no support for BF yet */ 392 if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) 393 return 0; 394 395 nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 396 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 397 nss += 1; 398 399 if (sta->sta.rx_nss != nss) { 400 sta->sta.rx_nss = nss; 401 changed |= IEEE80211_RC_NSS_CHANGED; 402 } 403 404 switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { 405 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: 406 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20; 407 break; 408 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: 409 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40; 410 break; 411 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: 412 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 413 break; 414 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: 415 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 416 break; 417 } 418 419 new_bw = ieee80211_sta_cur_vht_bw(sta); 420 if (new_bw != sta->sta.bandwidth) { 421 sta->sta.bandwidth = new_bw; 422 changed |= IEEE80211_RC_BW_CHANGED; 423 } 424 425 return changed; 426} 427 428void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 429 struct sta_info *sta, u8 opmode, 430 enum ieee80211_band band) 431{ 432 struct ieee80211_local *local = sdata->local; 433 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 434 435 u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode, band); 436 437 if (changed > 0) 438 rate_control_rate_update(local, sband, sta, changed); 439} 440 441void ieee80211_get_vht_mask_from_cap(__le16 vht_cap, 442 u16 vht_mask[NL80211_VHT_NSS_MAX]) 443{ 444 int i; 445 u16 mask, cap = le16_to_cpu(vht_cap); 446 447 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) { 448 mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 449 switch (mask) { 450 case IEEE80211_VHT_MCS_SUPPORT_0_7: 451 vht_mask[i] = 0x00FF; 452 break; 453 case IEEE80211_VHT_MCS_SUPPORT_0_8: 454 vht_mask[i] = 0x01FF; 455 break; 456 case IEEE80211_VHT_MCS_SUPPORT_0_9: 457 vht_mask[i] = 0x03FF; 458 break; 459 case IEEE80211_VHT_MCS_NOT_SUPPORTED: 460 default: 461 vht_mask[i] = 0; 462 break; 463 } 464 } 465} 466