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 /* don't support VHT for TDLS peers for now */ 133 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) 134 return; 135 136 /* 137 * A VHT STA must support 40 MHz, but if we verify that here 138 * then we break a few things - some APs (e.g. Netgear R6300v2 139 * and others based on the BCM4360 chipset) will unset this 140 * capability bit when operating in 20 MHz. 141 */ 142 143 vht_cap->vht_supported = true; 144 145 own_cap = sband->vht_cap; 146 /* 147 * If user has specified capability overrides, take care 148 * of that if the station we're setting up is the AP that 149 * we advertised a restricted capability set to. Override 150 * our own capabilities and then use those below. 151 */ 152 if (sdata->vif.type == NL80211_IFTYPE_STATION && 153 !test_sta_flag(sta, WLAN_STA_TDLS_PEER)) 154 ieee80211_apply_vhtcap_overrides(sdata, &own_cap); 155 156 /* take some capabilities as-is */ 157 cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info); 158 vht_cap->cap = cap_info; 159 vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 | 160 IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 | 161 IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 | 162 IEEE80211_VHT_CAP_RXLDPC | 163 IEEE80211_VHT_CAP_VHT_TXOP_PS | 164 IEEE80211_VHT_CAP_HTC_VHT | 165 IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK | 166 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB | 167 IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB | 168 IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN | 169 IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN; 170 171 /* and some based on our own capabilities */ 172 switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 173 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 174 vht_cap->cap |= cap_info & 175 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 176 break; 177 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 178 vht_cap->cap |= cap_info & 179 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 180 break; 181 default: 182 /* nothing */ 183 break; 184 } 185 186 /* symmetric capabilities */ 187 vht_cap->cap |= cap_info & own_cap.cap & 188 (IEEE80211_VHT_CAP_SHORT_GI_80 | 189 IEEE80211_VHT_CAP_SHORT_GI_160); 190 191 /* remaining ones */ 192 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE) 193 vht_cap->cap |= cap_info & 194 (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | 195 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK); 196 197 if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE) 198 vht_cap->cap |= cap_info & 199 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 200 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK); 201 202 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE) 203 vht_cap->cap |= cap_info & 204 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 205 206 if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) 207 vht_cap->cap |= cap_info & 208 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE; 209 210 if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC) 211 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK; 212 213 if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK) 214 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC; 215 216 /* Copy peer MCS info, the driver might need them. */ 217 memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, 218 sizeof(struct ieee80211_vht_mcs_info)); 219 220 /* but also restrict MCSes */ 221 for (i = 0; i < 8; i++) { 222 u16 own_rx, own_tx, peer_rx, peer_tx; 223 224 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map); 225 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 226 227 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map); 228 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 229 230 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); 231 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 232 233 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); 234 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; 235 236 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 237 if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 238 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 239 else if (own_rx < peer_tx) 240 peer_tx = own_rx; 241 } 242 243 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 244 if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED) 245 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED; 246 else if (own_tx < peer_rx) 247 peer_rx = own_tx; 248 } 249 250 vht_cap->vht_mcs.rx_mcs_map &= 251 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 252 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2); 253 254 vht_cap->vht_mcs.tx_mcs_map &= 255 ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); 256 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2); 257 } 258 259 /* finally set up the bandwidth */ 260 switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { 261 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: 262 case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: 263 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 264 break; 265 default: 266 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 267 } 268 269 sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); 270 } 271 272 enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) 273 { 274 struct ieee80211_sub_if_data *sdata = sta->sdata; 275 u32 cap = sta->sta.vht_cap.cap; 276 enum ieee80211_sta_rx_bandwidth bw; 277 278 if (!sta->sta.vht_cap.vht_supported) { 279 bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 280 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 281 goto check_max; 282 } 283 284 switch (sdata->vif.bss_conf.chandef.width) { 285 default: 286 WARN_ON_ONCE(1); 287 /* fall through */ 288 case NL80211_CHAN_WIDTH_20_NOHT: 289 case NL80211_CHAN_WIDTH_20: 290 bw = IEEE80211_STA_RX_BW_20; 291 break; 292 case NL80211_CHAN_WIDTH_40: 293 bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 294 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 295 break; 296 case NL80211_CHAN_WIDTH_160: 297 if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == 298 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) { 299 bw = IEEE80211_STA_RX_BW_160; 300 break; 301 } 302 /* fall through */ 303 case NL80211_CHAN_WIDTH_80P80: 304 if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == 305 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) { 306 bw = IEEE80211_STA_RX_BW_160; 307 break; 308 } 309 /* fall through */ 310 case NL80211_CHAN_WIDTH_80: 311 bw = IEEE80211_STA_RX_BW_80; 312 } 313 314 check_max: 315 if (bw > sta->cur_max_bandwidth) 316 bw = sta->cur_max_bandwidth; 317 return bw; 318 } 319 320 void ieee80211_sta_set_rx_nss(struct sta_info *sta) 321 { 322 u8 ht_rx_nss = 0, vht_rx_nss = 0; 323 324 /* if we received a notification already don't overwrite it */ 325 if (sta->sta.rx_nss) 326 return; 327 328 if (sta->sta.ht_cap.ht_supported) { 329 if (sta->sta.ht_cap.mcs.rx_mask[0]) 330 ht_rx_nss++; 331 if (sta->sta.ht_cap.mcs.rx_mask[1]) 332 ht_rx_nss++; 333 if (sta->sta.ht_cap.mcs.rx_mask[2]) 334 ht_rx_nss++; 335 if (sta->sta.ht_cap.mcs.rx_mask[3]) 336 ht_rx_nss++; 337 /* FIXME: consider rx_highest? */ 338 } 339 340 if (sta->sta.vht_cap.vht_supported) { 341 int i; 342 u16 rx_mcs_map; 343 344 rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); 345 346 for (i = 7; i >= 0; i--) { 347 u8 mcs = (rx_mcs_map >> (2 * i)) & 3; 348 349 if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { 350 vht_rx_nss = i + 1; 351 break; 352 } 353 } 354 /* FIXME: consider rx_highest? */ 355 } 356 357 ht_rx_nss = max(ht_rx_nss, vht_rx_nss); 358 sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); 359 } 360 361 u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 362 struct sta_info *sta, u8 opmode, 363 enum ieee80211_band band, bool nss_only) 364 { 365 struct ieee80211_local *local = sdata->local; 366 struct ieee80211_supported_band *sband; 367 enum ieee80211_sta_rx_bandwidth new_bw; 368 u32 changed = 0; 369 u8 nss; 370 371 sband = local->hw.wiphy->bands[band]; 372 373 /* ignore - no support for BF yet */ 374 if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) 375 return 0; 376 377 nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 378 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 379 nss += 1; 380 381 if (sta->sta.rx_nss != nss) { 382 sta->sta.rx_nss = nss; 383 changed |= IEEE80211_RC_NSS_CHANGED; 384 } 385 386 if (nss_only) 387 return changed; 388 389 switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { 390 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: 391 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20; 392 break; 393 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: 394 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40; 395 break; 396 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: 397 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; 398 break; 399 case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: 400 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; 401 break; 402 } 403 404 new_bw = ieee80211_sta_cur_vht_bw(sta); 405 if (new_bw != sta->sta.bandwidth) { 406 sta->sta.bandwidth = new_bw; 407 changed |= IEEE80211_RC_BW_CHANGED; 408 } 409 410 return changed; 411 } 412 413 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, 414 struct sta_info *sta, u8 opmode, 415 enum ieee80211_band band, bool nss_only) 416 { 417 struct ieee80211_local *local = sdata->local; 418 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 419 420 u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode, 421 band, nss_only); 422 423 if (changed > 0) 424 rate_control_rate_update(local, sband, sta, changed); 425 } 426