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_MASK); 189 190 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE) 191 vht_cap->cap |= cap_info & 192 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 193 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK); 194 195 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE) 196 vht_cap->cap |= cap_info & 197 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 198 199 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) 200 vht_cap->cap |= cap_info & 201 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE; 202 203 if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC) 204 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK; 205 206 if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK) 207 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC; 208 209 /* Copy peer MCS info, the driver might need them. */ 210 memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, 211 sizeof(struct ieee80211_vht_mcs_info)); 212 213 /* but also restrict MCSes */ 214 for (i = 0; i < 8; i++) { 215 u16 own_rx, own_tx, peer_rx, peer_tx; 216 217 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map); 218 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 219 220 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map); 221 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 222 223 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); 224 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 225 226 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); 227 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 228 229 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 230 if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 231 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 232 else if (own_rx < peer_tx) 233 peer_tx = own_rx; 234 } 235 236 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 237 if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 238 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 239 else if (own_tx < peer_rx) 240 peer_rx = own_tx; 241 } 242 243 vht_cap->vht_mcs.rx_mcs_map &= 244 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 245 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2); 246 247 vht_cap->vht_mcs.tx_mcs_map &= 248 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 249 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2); 250 } 251 252 /* finally set up the bandwidth */ 253 switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 254 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 255 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 256 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 257 break; 258 default: 259 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 260 } 261 262 sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); 263 } 264 265 enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) 266 { 267 struct ieee80211_sub_if_data *sdata = sta->sdata; 268 u32 cap = sta->sta.vht_cap.cap; 269 enum ieee80211_sta_rx_bandwidth bw; 270 271 if (!sta->sta.vht_cap.vht_supported) { 272 bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 273 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 274 goto check_max; 275 } 276 277 switch (sdata->vif.bss_conf.chandef.width) { 278 default: 279 WARN_ON_ONCE(1); 280 /* fall through */ 281 case NL80211_CHAN_WIDTH_20_NOHT: 282 case NL80211_CHAN_WIDTH_20: 283 case NL80211_CHAN_WIDTH_40: 284 bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 285 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 286 break; 287 case NL80211_CHAN_WIDTH_160: 288 if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == 289 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) { 290 bw = IEEE80211_STA_RX_BW_160; 291 break; 292 } 293 /* fall through */ 294 case NL80211_CHAN_WIDTH_80P80: 295 if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == 296 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) { 297 bw = IEEE80211_STA_RX_BW_160; 298 break; 299 } 300 /* fall through */ 301 case NL80211_CHAN_WIDTH_80: 302 bw = IEEE80211_STA_RX_BW_80; 303 } 304 305 check_max: 306 if (bw > sta->cur_max_bandwidth) 307 bw = sta->cur_max_bandwidth; 308 return bw; 309 } 310 311 void ieee80211_sta_set_rx_nss(struct sta_info *sta) 312 { 313 u8 ht_rx_nss = 0, vht_rx_nss = 0; 314 315 /* if we received a notification already don't overwrite it */ 316 if (sta->sta.rx_nss) 317 return; 318 319 if (sta->sta.ht_cap.ht_supported) { 320 if (sta->sta.ht_cap.mcs.rx_mask[0]) 321 ht_rx_nss++; 322 if (sta->sta.ht_cap.mcs.rx_mask[1]) 323 ht_rx_nss++; 324 if (sta->sta.ht_cap.mcs.rx_mask[2]) 325 ht_rx_nss++; 326 if (sta->sta.ht_cap.mcs.rx_mask[3]) 327 ht_rx_nss++; 328 /* FIXME: consider rx_highest? */ 329 } 330 331 if (sta->sta.vht_cap.vht_supported) { 332 int i; 333 u16 rx_mcs_map; 334 335 rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); 336 337 for (i = 7; i >= 0; i--) { 338 u8 mcs = (rx_mcs_map >> (2 * i)) & 3; 339 340 if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 341 vht_rx_nss = i + 1; 342 break; 343 } 344 } 345 /* FIXME: consider rx_highest? */ 346 } 347 348 ht_rx_nss = max(ht_rx_nss, vht_rx_nss); 349 sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); 350 } 351 352 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 353 struct sta_info *sta, u8 opmode, 354 enum ieee80211_band band, bool nss_only) 355 { 356 struct ieee80211_local *local = sdata->local; 357 struct ieee80211_supported_band *sband; 358 enum ieee80211_sta_rx_bandwidth new_bw; 359 u32 changed = 0; 360 u8 nss; 361 362 sband = local->hw.wiphy->bands[band]; 363 364 /* ignore - no support for BF yet */ 365 if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) 366 return; 367 368 nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 369 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 370 nss += 1; 371 372 if (sta->sta.rx_nss != nss) { 373 sta->sta.rx_nss = nss; 374 changed |= IEEE80211_RC_NSS_CHANGED; 375 } 376 377 if (nss_only) 378 goto change; 379 380 switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { 381 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: 382 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20; 383 break; 384 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: 385 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40; 386 break; 387 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: 388 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 389 break; 390 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: 391 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 392 break; 393 } 394 395 new_bw = ieee80211_sta_cur_vht_bw(sta); 396 if (new_bw != sta->sta.bandwidth) { 397 sta->sta.bandwidth = new_bw; 398 changed |= IEEE80211_RC_BW_CHANGED; 399 } 400 401 change: 402 if (changed) 403 rate_control_rate_update(local, sband, sta, changed); 404 } 405