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 16 static 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 27 void 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 } 113 114 void 115 ieee80211_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 /* A VHT STA must support 40 MHz */ 133 if (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 134 return; 135 136 vht_cap->vht_supported = true; 137 138 own_cap = sband->vht_cap; 139 /* 140 * If user has specified capability overrides, take care 141 * of that if the station we're setting up is the AP that 142 * we advertised a restricted capability set to. Override 143 * our own capabilities and then use those below. 144 */ 145 if (sdata->vif.type == NL80211_IFTYPE_STATION && 146 !test_sta_flag(sta, WLAN_STA_TDLS_PEER)) 147 ieee80211_apply_vhtcap_overrides(sdata, &own_cap); 148 149 /* take some capabilities as-is */ 150 cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info); 151 vht_cap->cap = cap_info; 152 vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 | 153 IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 | 154 IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 | 155 IEEE80211_VHT_CAP_RXLDPC | 156 IEEE80211_VHT_CAP_VHT_TXOP_PS | 157 IEEE80211_VHT_CAP_HTC_VHT | 158 IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK | 159 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB | 160 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB | 161 IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN | 162 IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN; 163 164 /* and some based on our own capabilities */ 165 switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 166 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 167 vht_cap->cap |= cap_info & 168 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 169 break; 170 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 171 vht_cap->cap |= cap_info & 172 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 173 break; 174 default: 175 /* nothing */ 176 break; 177 } 178 179 /* symmetric capabilities */ 180 vht_cap->cap |= cap_info & own_cap.cap & 181 (IEEE80211_VHT_CAP_SHORT_GI_80 | 182 IEEE80211_VHT_CAP_SHORT_GI_160); 183 184 /* remaining ones */ 185 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE) { 186 vht_cap->cap |= cap_info & 187 (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | 188 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MAX); 189 } 190 191 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE) 192 vht_cap->cap |= cap_info & 193 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 194 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MAX); 195 196 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE) 197 vht_cap->cap |= cap_info & 198 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 199 200 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) 201 vht_cap->cap |= cap_info & 202 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE; 203 204 if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC) 205 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK; 206 207 if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK) 208 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC; 209 210 /* Copy peer MCS info, the driver might need them. */ 211 memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, 212 sizeof(struct ieee80211_vht_mcs_info)); 213 214 /* but also restrict MCSes */ 215 for (i = 0; i < 8; i++) { 216 u16 own_rx, own_tx, peer_rx, peer_tx; 217 218 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map); 219 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 220 221 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map); 222 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 223 224 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); 225 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 226 227 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); 228 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 229 230 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 231 if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 232 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 233 else if (own_rx < peer_tx) 234 peer_tx = own_rx; 235 } 236 237 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 238 if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 239 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 240 else if (own_tx < peer_rx) 241 peer_rx = own_tx; 242 } 243 244 vht_cap->vht_mcs.rx_mcs_map &= 245 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 246 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2); 247 248 vht_cap->vht_mcs.tx_mcs_map &= 249 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 250 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2); 251 } 252 253 /* finally set up the bandwidth */ 254 switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 255 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 256 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 257 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 258 break; 259 default: 260 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 261 } 262 263 sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); 264 } 265 266 enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) 267 { 268 struct ieee80211_sub_if_data *sdata = sta->sdata; 269 u32 cap = sta->sta.vht_cap.cap; 270 enum ieee80211_sta_rx_bandwidth bw; 271 272 if (!sta->sta.vht_cap.vht_supported) { 273 bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 274 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 275 goto check_max; 276 } 277 278 switch (sdata->vif.bss_conf.chandef.width) { 279 default: 280 WARN_ON_ONCE(1); 281 /* fall through */ 282 case NL80211_CHAN_WIDTH_20_NOHT: 283 case NL80211_CHAN_WIDTH_20: 284 case NL80211_CHAN_WIDTH_40: 285 bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 286 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 287 break; 288 case NL80211_CHAN_WIDTH_160: 289 if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == 290 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) { 291 bw = IEEE80211_STA_RX_BW_160; 292 break; 293 } 294 /* fall through */ 295 case NL80211_CHAN_WIDTH_80P80: 296 if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == 297 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) { 298 bw = IEEE80211_STA_RX_BW_160; 299 break; 300 } 301 /* fall through */ 302 case NL80211_CHAN_WIDTH_80: 303 bw = IEEE80211_STA_RX_BW_80; 304 } 305 306 check_max: 307 if (bw > sta->cur_max_bandwidth) 308 bw = sta->cur_max_bandwidth; 309 return bw; 310 } 311 312 void ieee80211_sta_set_rx_nss(struct sta_info *sta) 313 { 314 u8 ht_rx_nss = 0, vht_rx_nss = 0; 315 316 /* if we received a notification already don't overwrite it */ 317 if (sta->sta.rx_nss) 318 return; 319 320 if (sta->sta.ht_cap.ht_supported) { 321 if (sta->sta.ht_cap.mcs.rx_mask[0]) 322 ht_rx_nss++; 323 if (sta->sta.ht_cap.mcs.rx_mask[1]) 324 ht_rx_nss++; 325 if (sta->sta.ht_cap.mcs.rx_mask[2]) 326 ht_rx_nss++; 327 if (sta->sta.ht_cap.mcs.rx_mask[3]) 328 ht_rx_nss++; 329 /* FIXME: consider rx_highest? */ 330 } 331 332 if (sta->sta.vht_cap.vht_supported) { 333 int i; 334 u16 rx_mcs_map; 335 336 rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); 337 338 for (i = 7; i >= 0; i--) { 339 u8 mcs = (rx_mcs_map >> (2 * i)) & 3; 340 341 if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 342 vht_rx_nss = i + 1; 343 break; 344 } 345 } 346 /* FIXME: consider rx_highest? */ 347 } 348 349 ht_rx_nss = max(ht_rx_nss, vht_rx_nss); 350 sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); 351 } 352 353 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 354 struct sta_info *sta, u8 opmode, 355 enum ieee80211_band band, bool nss_only) 356 { 357 struct ieee80211_local *local = sdata->local; 358 struct ieee80211_supported_band *sband; 359 enum ieee80211_sta_rx_bandwidth new_bw; 360 u32 changed = 0; 361 u8 nss; 362 363 sband = local->hw.wiphy->bands[band]; 364 365 /* ignore - no support for BF yet */ 366 if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) 367 return; 368 369 nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 370 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 371 nss += 1; 372 373 if (sta->sta.rx_nss != nss) { 374 sta->sta.rx_nss = nss; 375 changed |= IEEE80211_RC_NSS_CHANGED; 376 } 377 378 if (nss_only) 379 goto change; 380 381 switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { 382 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: 383 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20; 384 break; 385 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: 386 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40; 387 break; 388 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: 389 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 390 break; 391 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: 392 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 393 break; 394 } 395 396 new_bw = ieee80211_sta_cur_vht_bw(sta); 397 if (new_bw != sta->sta.bandwidth) { 398 sta->sta.bandwidth = new_bw; 399 changed |= IEEE80211_RC_BW_CHANGED; 400 } 401 402 change: 403 if (changed) 404 rate_control_rate_update(local, sband, sta, changed); 405 } 406