net/mac80211/vht.c

   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 }