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; 123 124 memset(vht_cap, 0, sizeof(*vht_cap)); 125 126 if (!sta->sta.ht_cap.ht_supported) 127 return; 128 129 if (!vht_cap_ie || !sband->vht_cap.vht_supported) 130 return; 131 132 /* 133 * A VHT STA must support 40 MHz, but if we verify that here 134 * then we break a few things - some APs (e.g. Netgear R6300v2 135 * and others based on the BCM4360 chipset) will unset this 136 * capability bit when operating in 20 MHz. 137 */ 138 139 vht_cap->vht_supported = true; 140 141 own_cap = sband->vht_cap; 142 /* 143 * If user has specified capability overrides, take care 144 * of that if the station we're setting up is the AP that 145 * we advertised a restricted capability set to. Override 146 * our own capabilities and then use those below. 147 */ 148 if (sdata->vif.type == NL80211_IFTYPE_STATION && 149 !test_sta_flag(sta, WLAN_STA_TDLS_PEER)) 150 ieee80211_apply_vhtcap_overrides(sdata, &own_cap); 151 152 /* take some capabilities as-is */ 153 cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info); 154 vht_cap->cap = cap_info; 155 vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 | 156 IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 | 157 IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 | 158 IEEE80211_VHT_CAP_RXLDPC | 159 IEEE80211_VHT_CAP_VHT_TXOP_PS | 160 IEEE80211_VHT_CAP_HTC_VHT | 161 IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK | 162 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB | 163 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB | 164 IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN | 165 IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN; 166 167 /* and some based on our own capabilities */ 168 switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 169 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 170 vht_cap->cap |= cap_info & 171 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 172 break; 173 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 174 vht_cap->cap |= cap_info & 175 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 176 break; 177 default: 178 /* nothing */ 179 break; 180 } 181 182 /* symmetric capabilities */ 183 vht_cap->cap |= cap_info & own_cap.cap & 184 (IEEE80211_VHT_CAP_SHORT_GI_80 | 185 IEEE80211_VHT_CAP_SHORT_GI_160); 186 187 /* remaining ones */ 188 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE) 189 vht_cap->cap |= cap_info & 190 (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | 191 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK); 192 193 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE) 194 vht_cap->cap |= cap_info & 195 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 196 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK); 197 198 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE) 199 vht_cap->cap |= cap_info & 200 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 201 202 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) 203 vht_cap->cap |= cap_info & 204 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE; 205 206 if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC) 207 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK; 208 209 if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK) 210 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC; 211 212 /* Copy peer MCS info, the driver might need them. */ 213 memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, 214 sizeof(struct ieee80211_vht_mcs_info)); 215 216 /* but also restrict MCSes */ 217 for (i = 0; i < 8; i++) { 218 u16 own_rx, own_tx, peer_rx, peer_tx; 219 220 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map); 221 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 222 223 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map); 224 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 225 226 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); 227 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 228 229 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); 230 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 231 232 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 233 if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 234 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 235 else if (own_rx < peer_tx) 236 peer_tx = own_rx; 237 } 238 239 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 240 if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 241 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 242 else if (own_tx < peer_rx) 243 peer_rx = own_tx; 244 } 245 246 vht_cap->vht_mcs.rx_mcs_map &= 247 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 248 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2); 249 250 vht_cap->vht_mcs.tx_mcs_map &= 251 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 252 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2); 253 } 254 255 /* finally set up the bandwidth */ 256 switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 257 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 258 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 259 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 260 break; 261 default: 262 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 263 } 264 265 sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); 266} 267 268enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta) 269{ 270 struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap; 271 u32 cap_width; 272 273 if (!vht_cap->vht_supported) 274 return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 275 IEEE80211_STA_RX_BW_40 : 276 IEEE80211_STA_RX_BW_20; 277 278 cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 279 280 if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ || 281 cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 282 return IEEE80211_STA_RX_BW_160; 283 284 return IEEE80211_STA_RX_BW_80; 285} 286 287static enum ieee80211_sta_rx_bandwidth 288ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width) 289{ 290 switch (width) { 291 case NL80211_CHAN_WIDTH_20_NOHT: 292 case NL80211_CHAN_WIDTH_20: 293 return IEEE80211_STA_RX_BW_20; 294 case NL80211_CHAN_WIDTH_40: 295 return IEEE80211_STA_RX_BW_40; 296 case NL80211_CHAN_WIDTH_80: 297 return IEEE80211_STA_RX_BW_80; 298 case NL80211_CHAN_WIDTH_160: 299 case NL80211_CHAN_WIDTH_80P80: 300 return IEEE80211_STA_RX_BW_160; 301 default: 302 WARN_ON_ONCE(1); 303 return IEEE80211_STA_RX_BW_20; 304 } 305} 306 307enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) 308{ 309 struct ieee80211_sub_if_data *sdata = sta->sdata; 310 enum ieee80211_sta_rx_bandwidth bw; 311 312 bw = ieee80211_chan_width_to_rx_bw(sdata->vif.bss_conf.chandef.width); 313 bw = min(bw, ieee80211_sta_cap_rx_bw(sta)); 314 bw = min(bw, sta->cur_max_bandwidth); 315 316 return bw; 317} 318 319void ieee80211_sta_set_rx_nss(struct sta_info *sta) 320{ 321 u8 ht_rx_nss = 0, vht_rx_nss = 0; 322 323 /* if we received a notification already don't overwrite it */ 324 if (sta->sta.rx_nss) 325 return; 326 327 if (sta->sta.ht_cap.ht_supported) { 328 if (sta->sta.ht_cap.mcs.rx_mask[0]) 329 ht_rx_nss++; 330 if (sta->sta.ht_cap.mcs.rx_mask[1]) 331 ht_rx_nss++; 332 if (sta->sta.ht_cap.mcs.rx_mask[2]) 333 ht_rx_nss++; 334 if (sta->sta.ht_cap.mcs.rx_mask[3]) 335 ht_rx_nss++; 336 /* FIXME: consider rx_highest? */ 337 } 338 339 if (sta->sta.vht_cap.vht_supported) { 340 int i; 341 u16 rx_mcs_map; 342 343 rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); 344 345 for (i = 7; i >= 0; i--) { 346 u8 mcs = (rx_mcs_map >> (2 * i)) & 3; 347 348 if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 349 vht_rx_nss = i + 1; 350 break; 351 } 352 } 353 /* FIXME: consider rx_highest? */ 354 } 355 356 ht_rx_nss = max(ht_rx_nss, vht_rx_nss); 357 sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); 358} 359 360u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 361 struct sta_info *sta, u8 opmode, 362 enum ieee80211_band band, bool nss_only) 363{ 364 struct ieee80211_local *local = sdata->local; 365 struct ieee80211_supported_band *sband; 366 enum ieee80211_sta_rx_bandwidth new_bw; 367 u32 changed = 0; 368 u8 nss; 369 370 sband = local->hw.wiphy->bands[band]; 371 372 /* ignore - no support for BF yet */ 373 if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) 374 return 0; 375 376 nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 377 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 378 nss += 1; 379 380 if (sta->sta.rx_nss != nss) { 381 sta->sta.rx_nss = nss; 382 changed |= IEEE80211_RC_NSS_CHANGED; 383 } 384 385 if (nss_only) 386 return changed; 387 388 switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { 389 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: 390 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20; 391 break; 392 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: 393 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40; 394 break; 395 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: 396 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 397 break; 398 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: 399 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 400 break; 401 } 402 403 new_bw = ieee80211_sta_cur_vht_bw(sta); 404 if (new_bw != sta->sta.bandwidth) { 405 sta->sta.bandwidth = new_bw; 406 changed |= IEEE80211_RC_BW_CHANGED; 407 } 408 409 return changed; 410} 411 412void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 413 struct sta_info *sta, u8 opmode, 414 enum ieee80211_band band, bool nss_only) 415{ 416 struct ieee80211_local *local = sdata->local; 417 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 418 419 u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode, 420 band, nss_only); 421 422 if (changed > 0) 423 rate_control_rate_update(local, sband, sta, changed); 424} 425