drivers/net/wireless/iwlwifi/dvm/rxon.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2013 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26
  27 #include <linux/etherdevice.h>
  28 #include "iwl-trans.h"
  29 #include "iwl-modparams.h"
  30 #include "dev.h"
  31 #include "agn.h"
  32 #include "calib.h"
  33
  34 /*
  35  * initialize rxon structure with default values from eeprom
  36  */
  37 void iwl_connection_init_rx_config(struct iwl_priv *priv,
  38                                    struct iwl_rxon_context *ctx)
  39 {
  40         memset(&ctx->staging, 0, sizeof(ctx->staging));
  41
  42         if (!ctx->vif) {
  43                 ctx->staging.dev_type = ctx->unused_devtype;
  44         } else
  45         switch (ctx->vif->type) {
  46         case NL80211_IFTYPE_AP:
  47                 ctx->staging.dev_type = ctx->ap_devtype;
  48                 break;
  49
  50         case NL80211_IFTYPE_STATION:
  51                 ctx->staging.dev_type = ctx->station_devtype;
  52                 ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
  53                 break;
  54
  55         case NL80211_IFTYPE_ADHOC:
  56                 ctx->staging.dev_type = ctx->ibss_devtype;
  57                 ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
  58                 ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
  59                                                   RXON_FILTER_ACCEPT_GRP_MSK;
  60                 break;
  61
  62         case NL80211_IFTYPE_MONITOR:
  63                 ctx->staging.dev_type = RXON_DEV_TYPE_SNIFFER;
  64                 break;
  65
  66         default:
  67                 IWL_ERR(priv, "Unsupported interface type %d\n",
  68                         ctx->vif->type);
  69                 break;
  70         }
  71
  72 #if 0
  73         /* TODO:  Figure out when short_preamble would be set and cache from
  74          * that */
  75         if (!hw_to_local(priv->hw)->short_preamble)
  76                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
  77         else
  78                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
  79 #endif
  80
  81         ctx->staging.channel =
  82                 cpu_to_le16(priv->hw->conf.chandef.chan->hw_value);
  83         priv->band = priv->hw->conf.chandef.chan->band;
  84
  85         iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);
  86
  87         /* clear both MIX and PURE40 mode flag */
  88         ctx->staging.flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED |
  89                                         RXON_FLG_CHANNEL_MODE_PURE_40);
  90         if (ctx->vif)
  91                 memcpy(ctx->staging.node_addr, ctx->vif->addr, ETH_ALEN);
  92
  93         ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
  94         ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
  95         ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
  96 }
  97
  98 static int iwlagn_disable_bss(struct iwl_priv *priv,
  99                               struct iwl_rxon_context *ctx,
 100                               struct iwl_rxon_cmd *send)
 101 {
 102         __le32 old_filter = send->filter_flags;
 103         int ret;
 104
 105         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 106         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
 107                                 CMD_SYNC, sizeof(*send), send);
 108
 109         send->filter_flags = old_filter;
 110
 111         if (ret)
 112                 IWL_DEBUG_QUIET_RFKILL(priv,
 113                         "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
 114
 115         return ret;
 116 }
 117
 118 static int iwlagn_disable_pan(struct iwl_priv *priv,
 119                               struct iwl_rxon_context *ctx,
 120                               struct iwl_rxon_cmd *send)
 121 {
 122         struct iwl_notification_wait disable_wait;
 123         __le32 old_filter = send->filter_flags;
 124         u8 old_dev_type = send->dev_type;
 125         int ret;
 126         static const u8 deactivate_cmd[] = {
 127                 REPLY_WIPAN_DEACTIVATION_COMPLETE
 128         };
 129
 130         iwl_init_notification_wait(&priv->notif_wait, &disable_wait,
 131                                    deactivate_cmd, ARRAY_SIZE(deactivate_cmd),
 132                                    NULL, NULL);
 133
 134         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 135         send->dev_type = RXON_DEV_TYPE_P2P;
 136         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
 137                                 CMD_SYNC, sizeof(*send), send);
 138
 139         send->filter_flags = old_filter;
 140         send->dev_type = old_dev_type;
 141
 142         if (ret) {
 143                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
 144                 iwl_remove_notification(&priv->notif_wait, &disable_wait);
 145         } else {
 146                 ret = iwl_wait_notification(&priv->notif_wait,
 147                                             &disable_wait, HZ);
 148                 if (ret)
 149                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
 150         }
 151
 152         return ret;
 153 }
 154
 155 static int iwlagn_disconn_pan(struct iwl_priv *priv,
 156                               struct iwl_rxon_context *ctx,
 157                               struct iwl_rxon_cmd *send)
 158 {
 159         __le32 old_filter = send->filter_flags;
 160         int ret;
 161
 162         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 163         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, CMD_SYNC,
 164                                 sizeof(*send), send);
 165
 166         send->filter_flags = old_filter;
 167
 168         return ret;
 169 }
 170
 171 static void iwlagn_update_qos(struct iwl_priv *priv,
 172                               struct iwl_rxon_context *ctx)
 173 {
 174         int ret;
 175
 176         if (!ctx->is_active)
 177                 return;
 178
 179         ctx->qos_data.def_qos_parm.qos_flags = 0;
 180
 181         if (ctx->qos_data.qos_active)
 182                 ctx->qos_data.def_qos_parm.qos_flags |=
 183                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 184
 185         if (ctx->ht.enabled)
 186                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 187
 188         IWL_DEBUG_INFO(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 189                       ctx->qos_data.qos_active,
 190                       ctx->qos_data.def_qos_parm.qos_flags);
 191
 192         ret = iwl_dvm_send_cmd_pdu(priv, ctx->qos_cmd, CMD_SYNC,
 193                                sizeof(struct iwl_qosparam_cmd),
 194                                &ctx->qos_data.def_qos_parm);
 195         if (ret)
 196                 IWL_DEBUG_QUIET_RFKILL(priv, "Failed to update QoS\n");
 197 }
 198
 199 static int iwlagn_update_beacon(struct iwl_priv *priv,
 200                                 struct ieee80211_vif *vif)
 201 {
 202         lockdep_assert_held(&priv->mutex);
 203
 204         dev_kfree_skb(priv->beacon_skb);
 205         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
 206         if (!priv->beacon_skb)
 207                 return -ENOMEM;
 208         return iwlagn_send_beacon_cmd(priv);
 209 }
 210
 211 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
 212                                   struct iwl_rxon_context *ctx)
 213 {
 214         int ret = 0;
 215         struct iwl_rxon_assoc_cmd rxon_assoc;
 216         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
 217         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
 218
 219         if ((rxon1->flags == rxon2->flags) &&
 220             (rxon1->filter_flags == rxon2->filter_flags) &&
 221             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 222             (rxon1->ofdm_ht_single_stream_basic_rates ==
 223              rxon2->ofdm_ht_single_stream_basic_rates) &&
 224             (rxon1->ofdm_ht_dual_stream_basic_rates ==
 225              rxon2->ofdm_ht_dual_stream_basic_rates) &&
 226             (rxon1->ofdm_ht_triple_stream_basic_rates ==
 227              rxon2->ofdm_ht_triple_stream_basic_rates) &&
 228             (rxon1->acquisition_data == rxon2->acquisition_data) &&
 229             (rxon1->rx_chain == rxon2->rx_chain) &&
 230             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 231                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 232                 return 0;
 233         }
 234
 235         rxon_assoc.flags = ctx->staging.flags;
 236         rxon_assoc.filter_flags = ctx->staging.filter_flags;
 237         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
 238         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
 239         rxon_assoc.reserved1 = 0;
 240         rxon_assoc.reserved2 = 0;
 241         rxon_assoc.reserved3 = 0;
 242         rxon_assoc.ofdm_ht_single_stream_basic_rates =
 243             ctx->staging.ofdm_ht_single_stream_basic_rates;
 244         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 245             ctx->staging.ofdm_ht_dual_stream_basic_rates;
 246         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
 247         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 248                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
 249         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
 250
 251         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_assoc_cmd,
 252                                 CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
 253         return ret;
 254 }
 255
 256 static u16 iwl_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
 257 {
 258         u16 new_val;
 259         u16 beacon_factor;
 260
 261         /*
 262          * If mac80211 hasn't given us a beacon interval, program
 263          * the default into the device (not checking this here
 264          * would cause the adjustment below to return the maximum
 265          * value, which may break PAN.)
 266          */
 267         if (!beacon_val)
 268                 return DEFAULT_BEACON_INTERVAL;
 269
 270         /*
 271          * If the beacon interval we obtained from the peer
 272          * is too large, we'll have to wake up more often
 273          * (and in IBSS case, we'll beacon too much)
 274          *
 275          * For example, if max_beacon_val is 4096, and the
 276          * requested beacon interval is 7000, we'll have to
 277          * use 3500 to be able to wake up on the beacons.
 278          *
 279          * This could badly influence beacon detection stats.
 280          */
 281
 282         beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
 283         new_val = beacon_val / beacon_factor;
 284
 285         if (!new_val)
 286                 new_val = max_beacon_val;
 287
 288         return new_val;
 289 }
 290
 291 static int iwl_send_rxon_timing(struct iwl_priv *priv,
 292                                 struct iwl_rxon_context *ctx)
 293 {
 294         u64 tsf;
 295         s32 interval_tm, rem;
 296         struct ieee80211_conf *conf = NULL;
 297         u16 beacon_int;
 298         struct ieee80211_vif *vif = ctx->vif;
 299
 300         conf = &priv->hw->conf;
 301
 302         lockdep_assert_held(&priv->mutex);
 303
 304         memset(&ctx->timing, 0, sizeof(struct iwl_rxon_time_cmd));
 305
 306         ctx->timing.timestamp = cpu_to_le64(priv->timestamp);
 307         ctx->timing.listen_interval = cpu_to_le16(conf->listen_interval);
 308
 309         beacon_int = vif ? vif->bss_conf.beacon_int : 0;
 310
 311         /*
 312          * TODO: For IBSS we need to get atim_window from mac80211,
 313          *       for now just always use 0
 314          */
 315         ctx->timing.atim_window = 0;
 316
 317         if (ctx->ctxid == IWL_RXON_CTX_PAN &&
 318             (!ctx->vif || ctx->vif->type != NL80211_IFTYPE_STATION) &&
 319             iwl_is_associated(priv, IWL_RXON_CTX_BSS) &&
 320             priv->contexts[IWL_RXON_CTX_BSS].vif &&
 321             priv->contexts[IWL_RXON_CTX_BSS].vif->bss_conf.beacon_int) {
 322                 ctx->timing.beacon_interval =
 323                         priv->contexts[IWL_RXON_CTX_BSS].timing.beacon_interval;
 324                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 325         } else if (ctx->ctxid == IWL_RXON_CTX_BSS &&
 326                    iwl_is_associated(priv, IWL_RXON_CTX_PAN) &&
 327                    priv->contexts[IWL_RXON_CTX_PAN].vif &&
 328                    priv->contexts[IWL_RXON_CTX_PAN].vif->bss_conf.beacon_int &&
 329                    (!iwl_is_associated_ctx(ctx) || !ctx->vif ||
 330                     !ctx->vif->bss_conf.beacon_int)) {
 331                 ctx->timing.beacon_interval =
 332                         priv->contexts[IWL_RXON_CTX_PAN].timing.beacon_interval;
 333                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 334         } else {
 335                 beacon_int = iwl_adjust_beacon_interval(beacon_int,
 336                         IWL_MAX_UCODE_BEACON_INTERVAL * TIME_UNIT);
 337                 ctx->timing.beacon_interval = cpu_to_le16(beacon_int);
 338         }
 339
 340         ctx->beacon_int = beacon_int;
 341
 342         tsf = priv->timestamp; /* tsf is modifed by do_div: copy it */
 343         interval_tm = beacon_int * TIME_UNIT;
 344         rem = do_div(tsf, interval_tm);
 345         ctx->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
 346
 347         ctx->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ?: 1) : 1;
 348
 349         IWL_DEBUG_ASSOC(priv,
 350                         "beacon interval %d beacon timer %d beacon tim %d\n",
 351                         le16_to_cpu(ctx->timing.beacon_interval),
 352                         le32_to_cpu(ctx->timing.beacon_init_val),
 353                         le16_to_cpu(ctx->timing.atim_window));
 354
 355         return iwl_dvm_send_cmd_pdu(priv, ctx->rxon_timing_cmd,
 356                                 CMD_SYNC, sizeof(ctx->timing), &ctx->timing);
 357 }
 358
 359 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
 360                                struct iwl_rxon_context *ctx)
 361 {
 362         int ret;
 363         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 364
 365         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 366                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
 367         } else {
 368                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
 369                 if (ret)
 370                         return ret;
 371                 if (ctx->vif) {
 372                         ret = iwl_send_rxon_timing(priv, ctx);
 373                         if (ret) {
 374                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 375                                 return ret;
 376                         }
 377                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
 378                 }
 379         }
 380         if (ret)
 381                 return ret;
 382
 383         /*
 384          * Un-assoc RXON clears the station table and WEP
 385          * keys, so we have to restore those afterwards.
 386          */
 387         iwl_clear_ucode_stations(priv, ctx);
 388         /* update -- might need P2P now */
 389         iwl_update_bcast_station(priv, ctx);
 390         iwl_restore_stations(priv, ctx);
 391         ret = iwl_restore_default_wep_keys(priv, ctx);
 392         if (ret) {
 393                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 394                 return ret;
 395         }
 396
 397         memcpy(active, &ctx->staging, sizeof(*active));
 398         return 0;
 399 }
 400
 401 static int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
 402 {
 403         int ret;
 404         s8 prev_tx_power;
 405         bool defer;
 406         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 407
 408         if (priv->calib_disabled & IWL_TX_POWER_CALIB_DISABLED)
 409                 return 0;
 410
 411         lockdep_assert_held(&priv->mutex);
 412
 413         if (priv->tx_power_user_lmt == tx_power && !force)
 414                 return 0;
 415
 416         if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
 417                 IWL_WARN(priv,
 418                          "Requested user TXPOWER %d below lower limit %d.\n",
 419                          tx_power,
 420                          IWLAGN_TX_POWER_TARGET_POWER_MIN);
 421                 return -EINVAL;
 422         }
 423
 424         if (tx_power > DIV_ROUND_UP(priv->nvm_data->max_tx_pwr_half_dbm, 2)) {
 425                 IWL_WARN(priv,
 426                         "Requested user TXPOWER %d above upper limit %d.\n",
 427                          tx_power, priv->nvm_data->max_tx_pwr_half_dbm);
 428                 return -EINVAL;
 429         }
 430
 431         if (!iwl_is_ready_rf(priv))
 432                 return -EIO;
 433
 434         /* scan complete and commit_rxon use tx_power_next value,
 435          * it always need to be updated for newest request */
 436         priv->tx_power_next = tx_power;
 437
 438         /* do not set tx power when scanning or channel changing */
 439         defer = test_bit(STATUS_SCANNING, &priv->status) ||
 440                 memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging));
 441         if (defer && !force) {
 442                 IWL_DEBUG_INFO(priv, "Deferring tx power set\n");
 443                 return 0;
 444         }
 445
 446         prev_tx_power = priv->tx_power_user_lmt;
 447         priv->tx_power_user_lmt = tx_power;
 448
 449         ret = iwlagn_send_tx_power(priv);
 450
 451         /* if fail to set tx_power, restore the orig. tx power */
 452         if (ret) {
 453                 priv->tx_power_user_lmt = prev_tx_power;
 454                 priv->tx_power_next = prev_tx_power;
 455         }
 456         return ret;
 457 }
 458
 459 static int iwlagn_rxon_connect(struct iwl_priv *priv,
 460                                struct iwl_rxon_context *ctx)
 461 {
 462         int ret;
 463         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 464
 465         /* RXON timing must be before associated RXON */
 466         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 467                 ret = iwl_send_rxon_timing(priv, ctx);
 468                 if (ret) {
 469                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 470                         return ret;
 471                 }
 472         }
 473         /* QoS info may be cleared by previous un-assoc RXON */
 474         iwlagn_update_qos(priv, ctx);
 475
 476         /*
 477          * We'll run into this code path when beaconing is
 478          * enabled, but then we also need to send the beacon
 479          * to the device.
 480          */
 481         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 482                 ret = iwlagn_update_beacon(priv, ctx->vif);
 483                 if (ret) {
 484                         IWL_ERR(priv,
 485                                 "Error sending required beacon (%d)!\n",
 486                                 ret);
 487                         return ret;
 488                 }
 489         }
 490
 491         priv->start_calib = 0;
 492         /*
 493          * Apply the new configuration.
 494          *
 495          * Associated RXON doesn't clear the station table in uCode,
 496          * so we don't need to restore stations etc. after this.
 497          */
 498         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, CMD_SYNC,
 499                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 500         if (ret) {
 501                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 502                 return ret;
 503         }
 504         memcpy(active, &ctx->staging, sizeof(*active));
 505
 506         /* IBSS beacon needs to be sent after setting assoc */
 507         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 508                 if (iwlagn_update_beacon(priv, ctx->vif))
 509                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 510         iwl_init_sensitivity(priv);
 511
 512         /*
 513          * If we issue a new RXON command which required a tune then
 514          * we must send a new TXPOWER command or we won't be able to
 515          * Tx any frames.
 516          *
 517          * It's expected we set power here if channel is changing.
 518          */
 519         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 520         if (ret) {
 521                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 522                 return ret;
 523         }
 524
 525         if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
 526             priv->cfg->ht_params && priv->cfg->ht_params->smps_mode)
 527                 ieee80211_request_smps(ctx->vif,
 528                                        priv->cfg->ht_params->smps_mode);
 529
 530         return 0;
 531 }
 532
 533 int iwlagn_set_pan_params(struct iwl_priv *priv)
 534 {
 535         struct iwl_wipan_params_cmd cmd;
 536         struct iwl_rxon_context *ctx_bss, *ctx_pan;
 537         int slot0 = 300, slot1 = 0;
 538         int ret;
 539
 540         if (priv->valid_contexts == BIT(IWL_RXON_CTX_BSS))
 541                 return 0;
 542
 543         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 544
 545         lockdep_assert_held(&priv->mutex);
 546
 547         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
 548         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
 549
 550         /*
 551          * If the PAN context is inactive, then we don't need
 552          * to update the PAN parameters, the last thing we'll
 553          * have done before it goes inactive is making the PAN
 554          * parameters be WLAN-only.
 555          */
 556         if (!ctx_pan->is_active)
 557                 return 0;
 558
 559         memset(&cmd, 0, sizeof(cmd));
 560
 561         /* only 2 slots are currently allowed */
 562         cmd.num_slots = 2;
 563
 564         cmd.slots[0].type = 0; /* BSS */
 565         cmd.slots[1].type = 1; /* PAN */
 566
 567         if (priv->hw_roc_setup) {
 568                 /* both contexts must be used for this to happen */
 569                 slot1 = IWL_MIN_SLOT_TIME;
 570                 slot0 = 3000;
 571         } else if (ctx_bss->vif && ctx_pan->vif) {
 572                 int bcnint = ctx_pan->beacon_int;
 573                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
 574
 575                 /* should be set, but seems unused?? */
 576                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
 577
 578                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
 579                     bcnint &&
 580                     bcnint != ctx_bss->beacon_int) {
 581                         IWL_ERR(priv,
 582                                 "beacon intervals don't match (%d, %d)\n",
 583                                 ctx_bss->beacon_int, ctx_pan->beacon_int);
 584                 } else
 585                         bcnint = max_t(int, bcnint,
 586                                        ctx_bss->beacon_int);
 587                 if (!bcnint)
 588                         bcnint = DEFAULT_BEACON_INTERVAL;
 589                 slot0 = bcnint / 2;
 590                 slot1 = bcnint - slot0;
 591
 592                 if (test_bit(STATUS_SCAN_HW, &priv->status) ||
 593                     (!ctx_bss->vif->bss_conf.idle &&
 594                      !ctx_bss->vif->bss_conf.assoc)) {
 595                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 596                         slot1 = IWL_MIN_SLOT_TIME;
 597                 } else if (!ctx_pan->vif->bss_conf.idle &&
 598                            !ctx_pan->vif->bss_conf.assoc) {
 599                         slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 600                         slot0 = IWL_MIN_SLOT_TIME;
 601                 }
 602         } else if (ctx_pan->vif) {
 603                 slot0 = 0;
 604                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
 605                                         ctx_pan->beacon_int;
 606                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
 607
 608                 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 609                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
 610                         slot1 = IWL_MIN_SLOT_TIME;
 611                 }
 612         }
 613
 614         cmd.slots[0].width = cpu_to_le16(slot0);
 615         cmd.slots[1].width = cpu_to_le16(slot1);
 616
 617         ret = iwl_dvm_send_cmd_pdu(priv, REPLY_WIPAN_PARAMS, CMD_SYNC,
 618                         sizeof(cmd), &cmd);
 619         if (ret)
 620                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
 621
 622         return ret;
 623 }
 624
 625 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
 626                              struct iwl_ht_config *ht_conf,
 627                              struct iwl_rxon_context *ctx)
 628 {
 629         struct iwl_rxon_cmd *rxon = &ctx->staging;
 630
 631         if (!ctx->ht.enabled) {
 632                 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 633                         RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
 634                         RXON_FLG_HT40_PROT_MSK |
 635                         RXON_FLG_HT_PROT_MSK);
 636                 return;
 637         }
 638
 639         /* FIXME: if the definition of ht.protection changed, the "translation"
 640          * will be needed for rxon->flags
 641          */
 642         rxon->flags |= cpu_to_le32(ctx->ht.protection <<
 643                                    RXON_FLG_HT_OPERATING_MODE_POS);
 644
 645         /* Set up channel bandwidth:
 646          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
 647         /* clear the HT channel mode before set the mode */
 648         rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 649                          RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 650         if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
 651                 /* pure ht40 */
 652                 if (ctx->ht.protection ==
 653                     IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
 654                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
 655                         /*
 656                          * Note: control channel is opposite of extension
 657                          * channel
 658                          */
 659                         switch (ctx->ht.extension_chan_offset) {
 660                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 661                                 rxon->flags &=
 662                                         ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 663                                 break;
 664                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 665                                 rxon->flags |=
 666                                         RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 667                                 break;
 668                         }
 669                 } else {
 670                         /*
 671                          * Note: control channel is opposite of extension
 672                          * channel
 673                          */
 674                         switch (ctx->ht.extension_chan_offset) {
 675                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 676                                 rxon->flags &=
 677                                         ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 678                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 679                                 break;
 680                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 681                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 682                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 683                                 break;
 684                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
 685                         default:
 686                                 /*
 687                                  * channel location only valid if in Mixed
 688                                  * mode
 689                                  */
 690                                 IWL_ERR(priv,
 691                                         "invalid extension channel offset\n");
 692                                 break;
 693                         }
 694                 }
 695         } else {
 696                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
 697         }
 698
 699         iwlagn_set_rxon_chain(priv, ctx);
 700
 701         IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
 702                         "extension channel offset 0x%x\n",
 703                         le32_to_cpu(rxon->flags), ctx->ht.protection,
 704                         ctx->ht.extension_chan_offset);
 705 }
 706
 707 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
 708 {
 709         struct iwl_rxon_context *ctx;
 710
 711         for_each_context(priv, ctx)
 712                 _iwl_set_rxon_ht(priv, ht_conf, ctx);
 713 }
 714
 715 /**
 716  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
 717  * @ch: requested channel as a pointer to struct ieee80211_channel
 718
 719  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 720  * in the staging RXON flag structure based on the ch->band
 721  */
 722 void iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
 723                          struct iwl_rxon_context *ctx)
 724 {
 725         enum ieee80211_band band = ch->band;
 726         u16 channel = ch->hw_value;
 727
 728         if ((le16_to_cpu(ctx->staging.channel) == channel) &&
 729             (priv->band == band))
 730                 return;
 731
 732         ctx->staging.channel = cpu_to_le16(channel);
 733         if (band == IEEE80211_BAND_5GHZ)
 734                 ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
 735         else
 736                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 737
 738         priv->band = band;
 739
 740         IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
 741
 742 }
 743
 744 void iwl_set_flags_for_band(struct iwl_priv *priv,
 745                             struct iwl_rxon_context *ctx,
 746                             enum ieee80211_band band,
 747                             struct ieee80211_vif *vif)
 748 {
 749         if (band == IEEE80211_BAND_5GHZ) {
 750                 ctx->staging.flags &=
 751                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
 752                       | RXON_FLG_CCK_MSK);
 753                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 754         } else {
 755                 /* Copied from iwl_post_associate() */
 756                 if (vif && vif->bss_conf.use_short_slot)
 757                         ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 758                 else
 759                         ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 760
 761                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 762                 ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
 763                 ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
 764         }
 765 }
 766
 767 static void iwl_set_rxon_hwcrypto(struct iwl_priv *priv,
 768                                   struct iwl_rxon_context *ctx, int hw_decrypt)
 769 {
 770         struct iwl_rxon_cmd *rxon = &ctx->staging;
 771
 772         if (hw_decrypt)
 773                 rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
 774         else
 775                 rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
 776
 777 }
 778
 779 /* validate RXON structure is valid */
 780 static int iwl_check_rxon_cmd(struct iwl_priv *priv,
 781                               struct iwl_rxon_context *ctx)
 782 {
 783         struct iwl_rxon_cmd *rxon = &ctx->staging;
 784         u32 errors = 0;
 785
 786         if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
 787                 if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
 788                         IWL_WARN(priv, "check 2.4G: wrong narrow\n");
 789                         errors |= BIT(0);
 790                 }
 791                 if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
 792                         IWL_WARN(priv, "check 2.4G: wrong radar\n");
 793                         errors |= BIT(1);
 794                 }
 795         } else {
 796                 if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
 797                         IWL_WARN(priv, "check 5.2G: not short slot!\n");
 798                         errors |= BIT(2);
 799                 }
 800                 if (rxon->flags & RXON_FLG_CCK_MSK) {
 801                         IWL_WARN(priv, "check 5.2G: CCK!\n");
 802                         errors |= BIT(3);
 803                 }
 804         }
 805         if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
 806                 IWL_WARN(priv, "mac/bssid mcast!\n");
 807                 errors |= BIT(4);
 808         }
 809
 810         /* make sure basic rates 6Mbps and 1Mbps are supported */
 811         if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
 812             (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
 813                 IWL_WARN(priv, "neither 1 nor 6 are basic\n");
 814                 errors |= BIT(5);
 815         }
 816
 817         if (le16_to_cpu(rxon->assoc_id) > 2007) {
 818                 IWL_WARN(priv, "aid > 2007\n");
 819                 errors |= BIT(6);
 820         }
 821
 822         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
 823                         == (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
 824                 IWL_WARN(priv, "CCK and short slot\n");
 825                 errors |= BIT(7);
 826         }
 827
 828         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
 829                         == (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
 830                 IWL_WARN(priv, "CCK and auto detect");
 831                 errors |= BIT(8);
 832         }
 833
 834         if ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
 835                             RXON_FLG_TGG_PROTECT_MSK)) ==
 836                             RXON_FLG_TGG_PROTECT_MSK) {
 837                 IWL_WARN(priv, "TGg but no auto-detect\n");
 838                 errors |= BIT(9);
 839         }
 840
 841         if (rxon->channel == 0) {
 842                 IWL_WARN(priv, "zero channel is invalid\n");
 843                 errors |= BIT(10);
 844         }
 845
 846         WARN(errors, "Invalid RXON (%#x), channel %d",
 847              errors, le16_to_cpu(rxon->channel));
 848
 849         return errors ? -EINVAL : 0;
 850 }
 851
 852 /**
 853  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
 854  * @priv: staging_rxon is compared to active_rxon
 855  *
 856  * If the RXON structure is changing enough to require a new tune,
 857  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
 858  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
 859  */
 860 static int iwl_full_rxon_required(struct iwl_priv *priv,
 861                                   struct iwl_rxon_context *ctx)
 862 {
 863         const struct iwl_rxon_cmd *staging = &ctx->staging;
 864         const struct iwl_rxon_cmd *active = &ctx->active;
 865
 866 #define CHK(cond)                                                       \
 867         if ((cond)) {                                                   \
 868                 IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");   \
 869                 return 1;                                               \
 870         }
 871
 872 #define CHK_NEQ(c1, c2)                                         \
 873         if ((c1) != (c2)) {                                     \
 874                 IWL_DEBUG_INFO(priv, "need full RXON - "        \
 875                                #c1 " != " #c2 " - %d != %d\n",  \
 876                                (c1), (c2));                     \
 877                 return 1;                                       \
 878         }
 879
 880         /* These items are only settable from the full RXON command */
 881         CHK(!iwl_is_associated_ctx(ctx));
 882         CHK(!ether_addr_equal(staging->bssid_addr, active->bssid_addr));
 883         CHK(!ether_addr_equal(staging->node_addr, active->node_addr));
 884         CHK(!ether_addr_equal(staging->wlap_bssid_addr,
 885                               active->wlap_bssid_addr));
 886         CHK_NEQ(staging->dev_type, active->dev_type);
 887         CHK_NEQ(staging->channel, active->channel);
 888         CHK_NEQ(staging->air_propagation, active->air_propagation);
 889         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
 890                 active->ofdm_ht_single_stream_basic_rates);
 891         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
 892                 active->ofdm_ht_dual_stream_basic_rates);
 893         CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
 894                 active->ofdm_ht_triple_stream_basic_rates);
 895         CHK_NEQ(staging->assoc_id, active->assoc_id);
 896
 897         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
 898          * be updated with the RXON_ASSOC command -- however only some
 899          * flag transitions are allowed using RXON_ASSOC */
 900
 901         /* Check if we are not switching bands */
 902         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
 903                 active->flags & RXON_FLG_BAND_24G_MSK);
 904
 905         /* Check if we are switching association toggle */
 906         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
 907                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
 908
 909 #undef CHK
 910 #undef CHK_NEQ
 911
 912         return 0;
 913 }
 914
 915 #ifdef CONFIG_IWLWIFI_DEBUG
 916 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
 917                              enum iwl_rxon_context_id ctxid)
 918 {
 919         struct iwl_rxon_context *ctx = &priv->contexts[ctxid];
 920         struct iwl_rxon_cmd *rxon = &ctx->staging;
 921
 922         IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
 923         iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
 924         IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n",
 925                         le16_to_cpu(rxon->channel));
 926         IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n",
 927                         le32_to_cpu(rxon->flags));
 928         IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
 929                         le32_to_cpu(rxon->filter_flags));
 930         IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
 931         IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
 932                         rxon->ofdm_basic_rates);
 933         IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n",
 934                         rxon->cck_basic_rates);
 935         IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
 936         IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
 937         IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n",
 938                         le16_to_cpu(rxon->assoc_id));
 939 }
 940 #endif
 941
 942 static void iwl_calc_basic_rates(struct iwl_priv *priv,
 943                                  struct iwl_rxon_context *ctx)
 944 {
 945         int lowest_present_ofdm = 100;
 946         int lowest_present_cck = 100;
 947         u8 cck = 0;
 948         u8 ofdm = 0;
 949
 950         if (ctx->vif) {
 951                 struct ieee80211_supported_band *sband;
 952                 unsigned long basic = ctx->vif->bss_conf.basic_rates;
 953                 int i;
 954
 955                 sband = priv->hw->wiphy->bands[priv->hw->conf.chandef.chan->band];
 956
 957                 for_each_set_bit(i, &basic, BITS_PER_LONG) {
 958                         int hw = sband->bitrates[i].hw_value;
 959                         if (hw >= IWL_FIRST_OFDM_RATE) {
 960                                 ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE);
 961                                 if (lowest_present_ofdm > hw)
 962                                         lowest_present_ofdm = hw;
 963                         } else {
 964                                 BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
 965
 966                                 cck |= BIT(hw);
 967                                 if (lowest_present_cck > hw)
 968                                         lowest_present_cck = hw;
 969                         }
 970                 }
 971         }
 972
 973         /*
 974          * Now we've got the basic rates as bitmaps in the ofdm and cck
 975          * variables. This isn't sufficient though, as there might not
 976          * be all the right rates in the bitmap. E.g. if the only basic
 977          * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps
 978          * and 6 Mbps because the 802.11-2007 standard says in 9.6:
 979          *
 980          *    [...] a STA responding to a received frame shall transmit
 981          *    its Control Response frame [...] at the highest rate in the
 982          *    BSSBasicRateSet parameter that is less than or equal to the
 983          *    rate of the immediately previous frame in the frame exchange
 984          *    sequence ([...]) and that is of the same modulation class
 985          *    ([...]) as the received frame. If no rate contained in the
 986          *    BSSBasicRateSet parameter meets these conditions, then the
 987          *    control frame sent in response to a received frame shall be
 988          *    transmitted at the highest mandatory rate of the PHY that is
 989          *    less than or equal to the rate of the received frame, and
 990          *    that is of the same modulation class as the received frame.
 991          *
 992          * As a consequence, we need to add all mandatory rates that are
 993          * lower than all of the basic rates to these bitmaps.
 994          */
 995
 996         if (IWL_RATE_24M_INDEX < lowest_present_ofdm)
 997                 ofdm |= IWL_RATE_24M_MASK >> IWL_FIRST_OFDM_RATE;
 998         if (IWL_RATE_12M_INDEX < lowest_present_ofdm)
 999                 ofdm |= IWL_RATE_12M_MASK >> IWL_FIRST_OFDM_RATE;
1000         /* 6M already there or needed so always add */
1001         ofdm |= IWL_RATE_6M_MASK >> IWL_FIRST_OFDM_RATE;
1002
1003         /*
1004          * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP.
1005          * Note, however:
1006          *  - if no CCK rates are basic, it must be ERP since there must
1007          *    be some basic rates at all, so they're OFDM => ERP PHY
1008          *    (or we're in 5 GHz, and the cck bitmap will never be used)
1009          *  - if 11M is a basic rate, it must be ERP as well, so add 5.5M
1010          *  - if 5.5M is basic, 1M and 2M are mandatory
1011          *  - if 2M is basic, 1M is mandatory
1012          *  - if 1M is basic, that's the only valid ACK rate.
1013          * As a consequence, it's not as complicated as it sounds, just add
1014          * any lower rates to the ACK rate bitmap.
1015          */
1016         if (IWL_RATE_11M_INDEX < lowest_present_cck)
1017                 cck |= IWL_RATE_11M_MASK >> IWL_FIRST_CCK_RATE;
1018         if (IWL_RATE_5M_INDEX < lowest_present_cck)
1019                 cck |= IWL_RATE_5M_MASK >> IWL_FIRST_CCK_RATE;
1020         if (IWL_RATE_2M_INDEX < lowest_present_cck)
1021                 cck |= IWL_RATE_2M_MASK >> IWL_FIRST_CCK_RATE;
1022         /* 1M already there or needed so always add */
1023         cck |= IWL_RATE_1M_MASK >> IWL_FIRST_CCK_RATE;
1024
1025         IWL_DEBUG_RATE(priv, "Set basic rates cck:0x%.2x ofdm:0x%.2x\n",
1026                        cck, ofdm);
1027
1028         /* "basic_rates" is a misnomer here -- should be called ACK rates */
1029         ctx->staging.cck_basic_rates = cck;
1030         ctx->staging.ofdm_basic_rates = ofdm;
1031 }
1032
1033 /**
1034  * iwlagn_commit_rxon - commit staging_rxon to hardware
1035  *
1036  * The RXON command in staging_rxon is committed to the hardware and
1037  * the active_rxon structure is updated with the new data.  This
1038  * function correctly transitions out of the RXON_ASSOC_MSK state if
1039  * a HW tune is required based on the RXON structure changes.
1040  *
1041  * The connect/disconnect flow should be as the following:
1042  *
1043  * 1. make sure send RXON command with association bit unset if not connect
1044  *      this should include the channel and the band for the candidate
1045  *      to be connected to
1046  * 2. Add Station before RXON association with the AP
1047  * 3. RXON_timing has to send before RXON for connection
1048  * 4. full RXON command - associated bit set
1049  * 5. use RXON_ASSOC command to update any flags changes
1050  */
1051 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
1052 {
1053         /* cast away the const for active_rxon in this function */
1054         struct iwl_rxon_cmd *active = (void *)&ctx->active;
1055         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
1056         int ret;
1057
1058         lockdep_assert_held(&priv->mutex);
1059
1060         if (!iwl_is_alive(priv))
1061                 return -EBUSY;
1062
1063         /* This function hardcodes a bunch of dual-mode assumptions */
1064         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
1065
1066         if (!ctx->is_active)
1067                 return 0;
1068
1069         /* always get timestamp with Rx frame */
1070         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
1071
1072         /* recalculate basic rates */
1073         iwl_calc_basic_rates(priv, ctx);
1074
1075         /*
1076          * force CTS-to-self frames protection if RTS-CTS is not preferred
1077          * one aggregation protection method
1078          */
1079         if (!priv->hw_params.use_rts_for_aggregation)
1080                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
1081
1082         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
1083             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
1084                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
1085         else
1086                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
1087
1088         iwl_print_rx_config_cmd(priv, ctx->ctxid);
1089         ret = iwl_check_rxon_cmd(priv, ctx);
1090         if (ret) {
1091                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
1092                 return -EINVAL;
1093         }
1094
1095         /*
1096          * receive commit_rxon request
1097          * abort any previous channel switch if still in process
1098          */
1099         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
1100             (priv->switch_channel != ctx->staging.channel)) {
1101                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
1102                               le16_to_cpu(priv->switch_channel));
1103                 iwl_chswitch_done(priv, false);
1104         }
1105
1106         /*
1107          * If we don't need to send a full RXON, we can use
1108          * iwl_rxon_assoc_cmd which is used to reconfigure filter
1109          * and other flags for the current radio configuration.
1110          */
1111         if (!iwl_full_rxon_required(priv, ctx)) {
1112                 ret = iwlagn_send_rxon_assoc(priv, ctx);
1113                 if (ret) {
1114                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
1115                         return ret;
1116                 }
1117
1118                 memcpy(active, &ctx->staging, sizeof(*active));
1119                 /*
1120                  * We do not commit tx power settings while channel changing,
1121                  * do it now if after settings changed.
1122                  */
1123                 iwl_set_tx_power(priv, priv->tx_power_next, false);
1124
1125                 /* make sure we are in the right PS state */
1126                 iwl_power_update_mode(priv, true);
1127
1128                 return 0;
1129         }
1130
1131         iwl_set_rxon_hwcrypto(priv, ctx, !iwlwifi_mod_params.sw_crypto);
1132
1133         IWL_DEBUG_INFO(priv,
1134                        "Going to commit RXON\n"
1135                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
1136                        "  * channel = %d\n"
1137                        "  * bssid = %pM\n",
1138                        (new_assoc ? "" : "out"),
1139                        le16_to_cpu(ctx->staging.channel),
1140                        ctx->staging.bssid_addr);
1141
1142         /*
1143          * Always clear associated first, but with the correct config.
1144          * This is required as for example station addition for the
1145          * AP station must be done after the BSSID is set to correctly
1146          * set up filters in the device.
1147          */
1148         ret = iwlagn_rxon_disconn(priv, ctx);
1149         if (ret)
1150                 return ret;
1151
1152         ret = iwlagn_set_pan_params(priv);
1153         if (ret)
1154                 return ret;
1155
1156         if (new_assoc)
1157                 return iwlagn_rxon_connect(priv, ctx);
1158
1159         return 0;
1160 }
1161
1162 void iwlagn_config_ht40(struct ieee80211_conf *conf,
1163                         struct iwl_rxon_context *ctx)
1164 {
1165         if (conf_is_ht40_minus(conf)) {
1166                 ctx->ht.extension_chan_offset =
1167                         IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1168                 ctx->ht.is_40mhz = true;
1169         } else if (conf_is_ht40_plus(conf)) {
1170                 ctx->ht.extension_chan_offset =
1171                         IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1172                 ctx->ht.is_40mhz = true;
1173         } else {
1174                 ctx->ht.extension_chan_offset =
1175                         IEEE80211_HT_PARAM_CHA_SEC_NONE;
1176                 ctx->ht.is_40mhz = false;
1177         }
1178 }
1179
1180 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
1181 {
1182         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
1183         struct iwl_rxon_context *ctx;
1184         struct ieee80211_conf *conf = &hw->conf;
1185         struct ieee80211_channel *channel = conf->chandef.chan;
1186         int ret = 0;
1187
1188         IWL_DEBUG_MAC80211(priv, "enter: changed %#x\n", changed);
1189
1190         mutex_lock(&priv->mutex);
1191
1192         if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
1193                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
1194                 goto out;
1195         }
1196
1197         if (!iwl_is_ready(priv)) {
1198                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
1199                 goto out;
1200         }
1201
1202         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
1203                        IEEE80211_CONF_CHANGE_CHANNEL)) {
1204                 /* mac80211 uses static for non-HT which is what we want */
1205                 priv->current_ht_config.smps = conf->smps_mode;
1206
1207                 /*
1208                  * Recalculate chain counts.
1209                  *
1210                  * If monitor mode is enabled then mac80211 will
1211                  * set up the SM PS mode to OFF if an HT channel is
1212                  * configured.
1213                  */
1214                 for_each_context(priv, ctx)
1215                         iwlagn_set_rxon_chain(priv, ctx);
1216         }
1217
1218         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
1219                 for_each_context(priv, ctx) {
1220                         /* Configure HT40 channels */
1221                         if (ctx->ht.enabled != conf_is_ht(conf))
1222                                 ctx->ht.enabled = conf_is_ht(conf);
1223
1224                         if (ctx->ht.enabled) {
1225                                 /* if HT40 is used, it should not change
1226                                  * after associated except channel switch */
1227                                 if (!ctx->ht.is_40mhz ||
1228                                                 !iwl_is_associated_ctx(ctx))
1229                                         iwlagn_config_ht40(conf, ctx);
1230                         } else
1231                                 ctx->ht.is_40mhz = false;
1232
1233                         /*
1234                          * Default to no protection. Protection mode will
1235                          * later be set from BSS config in iwl_ht_conf
1236                          */
1237                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
1238
1239                         /* if we are switching from ht to 2.4 clear flags
1240                          * from any ht related info since 2.4 does not
1241                          * support ht */
1242                         if (le16_to_cpu(ctx->staging.channel) !=
1243                             channel->hw_value)
1244                                 ctx->staging.flags = 0;
1245
1246                         iwl_set_rxon_channel(priv, channel, ctx);
1247                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
1248
1249                         iwl_set_flags_for_band(priv, ctx, channel->band,
1250                                                ctx->vif);
1251                 }
1252
1253                 iwl_update_bcast_stations(priv);
1254         }
1255
1256         if (changed & (IEEE80211_CONF_CHANGE_PS |
1257                         IEEE80211_CONF_CHANGE_IDLE)) {
1258                 ret = iwl_power_update_mode(priv, false);
1259                 if (ret)
1260                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
1261         }
1262
1263         if (changed & IEEE80211_CONF_CHANGE_POWER) {
1264                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
1265                         priv->tx_power_user_lmt, conf->power_level);
1266
1267                 iwl_set_tx_power(priv, conf->power_level, false);
1268         }
1269
1270         for_each_context(priv, ctx) {
1271                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1272                         continue;
1273                 iwlagn_commit_rxon(priv, ctx);
1274         }
1275  out:
1276         mutex_unlock(&priv->mutex);
1277         IWL_DEBUG_MAC80211(priv, "leave\n");
1278
1279         return ret;
1280 }
1281
1282 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
1283                                        struct iwl_rxon_context *ctx,
1284                                        struct ieee80211_bss_conf *bss_conf)
1285 {
1286         struct ieee80211_vif *vif = ctx->vif;
1287         struct iwl_rxon_context *tmp;
1288         struct ieee80211_sta *sta;
1289         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
1290         struct ieee80211_sta_ht_cap *ht_cap;
1291         bool need_multiple;
1292
1293         lockdep_assert_held(&priv->mutex);
1294
1295         switch (vif->type) {
1296         case NL80211_IFTYPE_STATION:
1297                 rcu_read_lock();
1298                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
1299                 if (!sta) {
1300                         /*
1301                          * If at all, this can only happen through a race
1302                          * when the AP disconnects us while we're still
1303                          * setting up the connection, in that case mac80211
1304                          * will soon tell us about that.
1305                          */
1306                         need_multiple = false;
1307                         rcu_read_unlock();
1308                         break;
1309                 }
1310
1311                 ht_cap = &sta->ht_cap;
1312
1313                 need_multiple = true;
1314
1315                 /*
1316                  * If the peer advertises no support for receiving 2 and 3
1317                  * stream MCS rates, it can't be transmitting them either.
1318                  */
1319                 if (ht_cap->mcs.rx_mask[1] == 0 &&
1320                     ht_cap->mcs.rx_mask[2] == 0) {
1321                         need_multiple = false;
1322                 } else if (!(ht_cap->mcs.tx_params &
1323                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
1324                         /* If it can't TX MCS at all ... */
1325                         need_multiple = false;
1326                 } else if (ht_cap->mcs.tx_params &
1327                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
1328                         int maxstreams;
1329
1330                         /*
1331                          * But if it can receive them, it might still not
1332                          * be able to transmit them, which is what we need
1333                          * to check here -- so check the number of streams
1334                          * it advertises for TX (if different from RX).
1335                          */
1336
1337                         maxstreams = (ht_cap->mcs.tx_params &
1338                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
1339                         maxstreams >>=
1340                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
1341                         maxstreams += 1;
1342
1343                         if (maxstreams <= 1)
1344                                 need_multiple = false;
1345                 }
1346
1347                 rcu_read_unlock();
1348                 break;
1349         case NL80211_IFTYPE_ADHOC:
1350                 /* currently */
1351                 need_multiple = false;
1352                 break;
1353         default:
1354                 /* only AP really */
1355                 need_multiple = true;
1356                 break;
1357         }
1358
1359         ctx->ht_need_multiple_chains = need_multiple;
1360
1361         if (!need_multiple) {
1362                 /* check all contexts */
1363                 for_each_context(priv, tmp) {
1364                         if (!tmp->vif)
1365                                 continue;
1366                         if (tmp->ht_need_multiple_chains) {
1367                                 need_multiple = true;
1368                                 break;
1369                         }
1370                 }
1371         }
1372
1373         ht_conf->single_chain_sufficient = !need_multiple;
1374 }
1375
1376 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
1377 {
1378         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
1379         int ret;
1380
1381         if (priv->calib_disabled & IWL_CHAIN_NOISE_CALIB_DISABLED)
1382                 return;
1383
1384         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
1385             iwl_is_any_associated(priv)) {
1386                 struct iwl_calib_chain_noise_reset_cmd cmd;
1387
1388                 /* clear data for chain noise calibration algorithm */
1389                 data->chain_noise_a = 0;
1390                 data->chain_noise_b = 0;
1391                 data->chain_noise_c = 0;
1392                 data->chain_signal_a = 0;
1393                 data->chain_signal_b = 0;
1394                 data->chain_signal_c = 0;
1395                 data->beacon_count = 0;
1396
1397                 memset(&cmd, 0, sizeof(cmd));
1398                 iwl_set_calib_hdr(&cmd.hdr,
1399                         priv->phy_calib_chain_noise_reset_cmd);
1400                 ret = iwl_dvm_send_cmd_pdu(priv,
1401                                         REPLY_PHY_CALIBRATION_CMD,
1402                                         CMD_SYNC, sizeof(cmd), &cmd);
1403                 if (ret)
1404                         IWL_ERR(priv,
1405                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
1406                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
1407                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
1408         }
1409 }
1410
1411 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
1412                              struct ieee80211_vif *vif,
1413                              struct ieee80211_bss_conf *bss_conf,
1414                              u32 changes)
1415 {
1416         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
1417         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1418         int ret;
1419         bool force = false;
1420
1421         mutex_lock(&priv->mutex);
1422
1423         if (changes & BSS_CHANGED_IDLE && bss_conf->idle) {
1424                 /*
1425                  * If we go idle, then clearly no "passive-no-rx"
1426                  * workaround is needed any more, this is a reset.
1427                  */
1428                 iwlagn_lift_passive_no_rx(priv);
1429         }
1430
1431         if (unlikely(!iwl_is_ready(priv))) {
1432                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
1433                 mutex_unlock(&priv->mutex);
1434                 return;
1435         }
1436
1437         if (unlikely(!ctx->vif)) {
1438                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
1439                 mutex_unlock(&priv->mutex);
1440                 return;
1441         }
1442
1443         if (changes & BSS_CHANGED_BEACON_INT)
1444                 force = true;
1445
1446         if (changes & BSS_CHANGED_QOS) {
1447                 ctx->qos_data.qos_active = bss_conf->qos;
1448                 iwlagn_update_qos(priv, ctx);
1449         }
1450
1451         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
1452         if (vif->bss_conf.use_short_preamble)
1453                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
1454         else
1455                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
1456
1457         if (changes & BSS_CHANGED_ASSOC) {
1458                 if (bss_conf->assoc) {
1459                         priv->timestamp = bss_conf->sync_tsf;
1460                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
1461                 } else {
1462                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
1463
1464                         if (ctx->ctxid == IWL_RXON_CTX_BSS)
1465                                 priv->have_rekey_data = false;
1466                 }
1467
1468                 iwlagn_bt_coex_rssi_monitor(priv);
1469         }
1470
1471         if (ctx->ht.enabled) {
1472                 ctx->ht.protection = bss_conf->ht_operation_mode &
1473                                         IEEE80211_HT_OP_MODE_PROTECTION;
1474                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
1475                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
1476                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
1477                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
1478         }
1479
1480         iwlagn_set_rxon_chain(priv, ctx);
1481
1482         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
1483                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
1484         else
1485                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
1486
1487         if (bss_conf->use_cts_prot)
1488                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
1489         else
1490                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
1491
1492         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
1493
1494         if (vif->type == NL80211_IFTYPE_AP ||
1495             vif->type == NL80211_IFTYPE_ADHOC) {
1496                 if (vif->bss_conf.enable_beacon) {
1497                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
1498                         priv->beacon_ctx = ctx;
1499                 } else {
1500                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
1501                         priv->beacon_ctx = NULL;
1502                 }
1503         }
1504
1505         /*
1506          * If the ucode decides to do beacon filtering before
1507          * association, it will lose beacons that are needed
1508          * before sending frames out on passive channels. This
1509          * causes association failures on those channels. Enable
1510          * receiving beacons in such cases.
1511          */
1512
1513         if (vif->type == NL80211_IFTYPE_STATION) {
1514                 if (!bss_conf->assoc)
1515                         ctx->staging.filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
1516                 else
1517                         ctx->staging.filter_flags &=
1518                                                     ~RXON_FILTER_BCON_AWARE_MSK;
1519         }
1520
1521         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1522                 iwlagn_commit_rxon(priv, ctx);
1523
1524         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
1525                 /*
1526                  * The chain noise calibration will enable PM upon
1527                  * completion. If calibration has already been run
1528                  * then we need to enable power management here.
1529                  */
1530                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
1531                         iwl_power_update_mode(priv, false);
1532
1533                 /* Enable RX differential gain and sensitivity calibrations */
1534                 iwlagn_chain_noise_reset(priv);
1535                 priv->start_calib = 1;
1536         }
1537
1538         if (changes & BSS_CHANGED_IBSS) {
1539                 ret = iwlagn_manage_ibss_station(priv, vif,
1540                                                  bss_conf->ibss_joined);
1541                 if (ret)
1542                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
1543                                 bss_conf->ibss_joined ? "add" : "remove",
1544                                 bss_conf->bssid);
1545         }
1546
1547         if (changes & BSS_CHANGED_BEACON && priv->beacon_ctx == ctx) {
1548                 if (iwlagn_update_beacon(priv, vif))
1549                         IWL_ERR(priv, "Error updating beacon\n");
1550         }
1551
1552         mutex_unlock(&priv->mutex);
1553 }
1554
1555 void iwlagn_post_scan(struct iwl_priv *priv)
1556 {
1557         struct iwl_rxon_context *ctx;
1558
1559         /*
1560          * We do not commit power settings while scan is pending,
1561          * do it now if the settings changed.
1562          */
1563         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
1564         iwl_set_tx_power(priv, priv->tx_power_next, false);
1565
1566         /*
1567          * Since setting the RXON may have been deferred while
1568          * performing the scan, fire one off if needed
1569          */
1570         for_each_context(priv, ctx)
1571                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1572                         iwlagn_commit_rxon(priv, ctx);
1573
1574         iwlagn_set_pan_params(priv);
1575 }