drivers/net/wireless/iwlwifi/iwl-agn-rxon.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 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 "iwl-dev.h"
  28 #include "iwl-agn.h"
  29 #include "iwl-core.h"
  30 #include "iwl-agn-calib.h"
  31 #include "iwl-trans.h"
  32 #include "iwl-shared.h"
  33
  34 static int iwlagn_disable_bss(struct iwl_priv *priv,
  35                               struct iwl_rxon_context *ctx,
  36                               struct iwl_rxon_cmd *send)
  37 {
  38         __le32 old_filter = send->filter_flags;
  39         int ret;
  40
  41         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  42         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd,
  43                                 CMD_SYNC, sizeof(*send), send);
  44
  45         send->filter_flags = old_filter;
  46
  47         if (ret)
  48                 IWL_ERR(priv, "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
  49
  50         return ret;
  51 }
  52
  53 static int iwlagn_disable_pan(struct iwl_priv *priv,
  54                               struct iwl_rxon_context *ctx,
  55                               struct iwl_rxon_cmd *send)
  56 {
  57         struct iwl_notification_wait disable_wait;
  58         __le32 old_filter = send->filter_flags;
  59         u8 old_dev_type = send->dev_type;
  60         int ret;
  61
  62         iwlagn_init_notification_wait(priv, &disable_wait,
  63                                       REPLY_WIPAN_DEACTIVATION_COMPLETE,
  64                                       NULL, NULL);
  65
  66         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  67         send->dev_type = RXON_DEV_TYPE_P2P;
  68         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd,
  69                                 CMD_SYNC, sizeof(*send), send);
  70
  71         send->filter_flags = old_filter;
  72         send->dev_type = old_dev_type;
  73
  74         if (ret) {
  75                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
  76                 iwlagn_remove_notification(priv, &disable_wait);
  77         } else {
  78                 ret = iwlagn_wait_notification(priv, &disable_wait, HZ);
  79                 if (ret)
  80                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
  81         }
  82
  83         return ret;
  84 }
  85
  86 static int iwlagn_disconn_pan(struct iwl_priv *priv,
  87                               struct iwl_rxon_context *ctx,
  88                               struct iwl_rxon_cmd *send)
  89 {
  90         __le32 old_filter = send->filter_flags;
  91         int ret;
  92
  93         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  94         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
  95                                 sizeof(*send), send);
  96
  97         send->filter_flags = old_filter;
  98
  99         return ret;
 100 }
 101
 102 static void iwlagn_update_qos(struct iwl_priv *priv,
 103                               struct iwl_rxon_context *ctx)
 104 {
 105         int ret;
 106
 107         if (!ctx->is_active)
 108                 return;
 109
 110         ctx->qos_data.def_qos_parm.qos_flags = 0;
 111
 112         if (ctx->qos_data.qos_active)
 113                 ctx->qos_data.def_qos_parm.qos_flags |=
 114                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 115
 116         if (ctx->ht.enabled)
 117                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 118
 119         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 120                       ctx->qos_data.qos_active,
 121                       ctx->qos_data.def_qos_parm.qos_flags);
 122
 123         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->qos_cmd, CMD_SYNC,
 124                                sizeof(struct iwl_qosparam_cmd),
 125                                &ctx->qos_data.def_qos_parm);
 126         if (ret)
 127                 IWL_ERR(priv, "Failed to update QoS\n");
 128 }
 129
 130 static int iwlagn_update_beacon(struct iwl_priv *priv,
 131                                 struct ieee80211_vif *vif)
 132 {
 133         lockdep_assert_held(&priv->shrd->mutex);
 134
 135         dev_kfree_skb(priv->beacon_skb);
 136         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
 137         if (!priv->beacon_skb)
 138                 return -ENOMEM;
 139         return iwlagn_send_beacon_cmd(priv);
 140 }
 141
 142 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
 143                            struct iwl_rxon_context *ctx)
 144 {
 145         int ret = 0;
 146         struct iwl_rxon_assoc_cmd rxon_assoc;
 147         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
 148         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
 149
 150         if ((rxon1->flags == rxon2->flags) &&
 151             (rxon1->filter_flags == rxon2->filter_flags) &&
 152             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 153             (rxon1->ofdm_ht_single_stream_basic_rates ==
 154              rxon2->ofdm_ht_single_stream_basic_rates) &&
 155             (rxon1->ofdm_ht_dual_stream_basic_rates ==
 156              rxon2->ofdm_ht_dual_stream_basic_rates) &&
 157             (rxon1->ofdm_ht_triple_stream_basic_rates ==
 158              rxon2->ofdm_ht_triple_stream_basic_rates) &&
 159             (rxon1->acquisition_data == rxon2->acquisition_data) &&
 160             (rxon1->rx_chain == rxon2->rx_chain) &&
 161             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 162                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 163                 return 0;
 164         }
 165
 166         rxon_assoc.flags = ctx->staging.flags;
 167         rxon_assoc.filter_flags = ctx->staging.filter_flags;
 168         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
 169         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
 170         rxon_assoc.reserved1 = 0;
 171         rxon_assoc.reserved2 = 0;
 172         rxon_assoc.reserved3 = 0;
 173         rxon_assoc.ofdm_ht_single_stream_basic_rates =
 174             ctx->staging.ofdm_ht_single_stream_basic_rates;
 175         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 176             ctx->staging.ofdm_ht_dual_stream_basic_rates;
 177         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
 178         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 179                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
 180         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
 181
 182         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_assoc_cmd,
 183                                 CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
 184         return ret;
 185 }
 186
 187 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
 188                                struct iwl_rxon_context *ctx)
 189 {
 190         int ret;
 191         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 192
 193         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 194                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
 195         } else {
 196                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
 197                 if (ret)
 198                         return ret;
 199                 if (ctx->vif) {
 200                         ret = iwl_send_rxon_timing(priv, ctx);
 201                         if (ret) {
 202                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 203                                 return ret;
 204                         }
 205                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
 206                 }
 207         }
 208         if (ret)
 209                 return ret;
 210
 211         /*
 212          * Un-assoc RXON clears the station table and WEP
 213          * keys, so we have to restore those afterwards.
 214          */
 215         iwl_clear_ucode_stations(priv, ctx);
 216         /* update -- might need P2P now */
 217         iwl_update_bcast_station(priv, ctx);
 218         iwl_restore_stations(priv, ctx);
 219         ret = iwl_restore_default_wep_keys(priv, ctx);
 220         if (ret) {
 221                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 222                 return ret;
 223         }
 224
 225         memcpy(active, &ctx->staging, sizeof(*active));
 226         return 0;
 227 }
 228
 229 static int iwlagn_rxon_connect(struct iwl_priv *priv,
 230                                struct iwl_rxon_context *ctx)
 231 {
 232         int ret;
 233         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 234
 235         /* RXON timing must be before associated RXON */
 236         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 237                 ret = iwl_send_rxon_timing(priv, ctx);
 238                 if (ret) {
 239                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 240                         return ret;
 241                 }
 242         }
 243         /* QoS info may be cleared by previous un-assoc RXON */
 244         iwlagn_update_qos(priv, ctx);
 245
 246         /*
 247          * We'll run into this code path when beaconing is
 248          * enabled, but then we also need to send the beacon
 249          * to the device.
 250          */
 251         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 252                 ret = iwlagn_update_beacon(priv, ctx->vif);
 253                 if (ret) {
 254                         IWL_ERR(priv,
 255                                 "Error sending required beacon (%d)!\n",
 256                                 ret);
 257                         return ret;
 258                 }
 259         }
 260
 261         priv->start_calib = 0;
 262         /*
 263          * Apply the new configuration.
 264          *
 265          * Associated RXON doesn't clear the station table in uCode,
 266          * so we don't need to restore stations etc. after this.
 267          */
 268         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
 269                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 270         if (ret) {
 271                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 272                 return ret;
 273         }
 274         memcpy(active, &ctx->staging, sizeof(*active));
 275
 276         iwl_reprogram_ap_sta(priv, ctx);
 277
 278         /* IBSS beacon needs to be sent after setting assoc */
 279         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 280                 if (iwlagn_update_beacon(priv, ctx->vif))
 281                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 282         iwl_init_sensitivity(priv);
 283
 284         /*
 285          * If we issue a new RXON command which required a tune then
 286          * we must send a new TXPOWER command or we won't be able to
 287          * Tx any frames.
 288          *
 289          * It's expected we set power here if channel is changing.
 290          */
 291         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 292         if (ret) {
 293                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 294                 return ret;
 295         }
 296
 297         if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
 298             priv->cfg->ht_params && priv->cfg->ht_params->smps_mode)
 299                 ieee80211_request_smps(ctx->vif,
 300                                        priv->cfg->ht_params->smps_mode);
 301
 302         return 0;
 303 }
 304
 305 int iwlagn_set_pan_params(struct iwl_priv *priv)
 306 {
 307         struct iwl_wipan_params_cmd cmd;
 308         struct iwl_rxon_context *ctx_bss, *ctx_pan;
 309         int slot0 = 300, slot1 = 0;
 310         int ret;
 311
 312         if (priv->shrd->valid_contexts == BIT(IWL_RXON_CTX_BSS))
 313                 return 0;
 314
 315         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 316
 317         lockdep_assert_held(&priv->shrd->mutex);
 318
 319         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
 320         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
 321
 322         /*
 323          * If the PAN context is inactive, then we don't need
 324          * to update the PAN parameters, the last thing we'll
 325          * have done before it goes inactive is making the PAN
 326          * parameters be WLAN-only.
 327          */
 328         if (!ctx_pan->is_active)
 329                 return 0;
 330
 331         memset(&cmd, 0, sizeof(cmd));
 332
 333         /* only 2 slots are currently allowed */
 334         cmd.num_slots = 2;
 335
 336         cmd.slots[0].type = 0; /* BSS */
 337         cmd.slots[1].type = 1; /* PAN */
 338
 339         if (priv->hw_roc_setup) {
 340                 /* both contexts must be used for this to happen */
 341                 slot1 = IWL_MIN_SLOT_TIME;
 342                 slot0 = 3000;
 343         } else if (ctx_bss->vif && ctx_pan->vif) {
 344                 int bcnint = ctx_pan->beacon_int;
 345                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
 346
 347                 /* should be set, but seems unused?? */
 348                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
 349
 350                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
 351                     bcnint &&
 352                     bcnint != ctx_bss->beacon_int) {
 353                         IWL_ERR(priv,
 354                                 "beacon intervals don't match (%d, %d)\n",
 355                                 ctx_bss->beacon_int, ctx_pan->beacon_int);
 356                 } else
 357                         bcnint = max_t(int, bcnint,
 358                                        ctx_bss->beacon_int);
 359                 if (!bcnint)
 360                         bcnint = DEFAULT_BEACON_INTERVAL;
 361                 slot0 = bcnint / 2;
 362                 slot1 = bcnint - slot0;
 363
 364                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
 365                     (!ctx_bss->vif->bss_conf.idle &&
 366                      !ctx_bss->vif->bss_conf.assoc)) {
 367                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 368                         slot1 = IWL_MIN_SLOT_TIME;
 369                 } else if (!ctx_pan->vif->bss_conf.idle &&
 370                            !ctx_pan->vif->bss_conf.assoc) {
 371                         slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 372                         slot0 = IWL_MIN_SLOT_TIME;
 373                 }
 374         } else if (ctx_pan->vif) {
 375                 slot0 = 0;
 376                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
 377                                         ctx_pan->beacon_int;
 378                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
 379
 380                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
 381                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
 382                         slot1 = IWL_MIN_SLOT_TIME;
 383                 }
 384         }
 385
 386         cmd.slots[0].width = cpu_to_le16(slot0);
 387         cmd.slots[1].width = cpu_to_le16(slot1);
 388
 389         ret = iwl_trans_send_cmd_pdu(trans(priv), REPLY_WIPAN_PARAMS, CMD_SYNC,
 390                         sizeof(cmd), &cmd);
 391         if (ret)
 392                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
 393
 394         return ret;
 395 }
 396
 397 /**
 398  * iwlagn_commit_rxon - commit staging_rxon to hardware
 399  *
 400  * The RXON command in staging_rxon is committed to the hardware and
 401  * the active_rxon structure is updated with the new data.  This
 402  * function correctly transitions out of the RXON_ASSOC_MSK state if
 403  * a HW tune is required based on the RXON structure changes.
 404  *
 405  * The connect/disconnect flow should be as the following:
 406  *
 407  * 1. make sure send RXON command with association bit unset if not connect
 408  *      this should include the channel and the band for the candidate
 409  *      to be connected to
 410  * 2. Add Station before RXON association with the AP
 411  * 3. RXON_timing has to send before RXON for connection
 412  * 4. full RXON command - associated bit set
 413  * 5. use RXON_ASSOC command to update any flags changes
 414  */
 415 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 416 {
 417         /* cast away the const for active_rxon in this function */
 418         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 419         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 420         int ret;
 421
 422         lockdep_assert_held(&priv->shrd->mutex);
 423
 424         if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 425                 return -EINVAL;
 426
 427         if (!iwl_is_alive(priv->shrd))
 428                 return -EBUSY;
 429
 430         /* This function hardcodes a bunch of dual-mode assumptions */
 431         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 432
 433         if (!ctx->is_active)
 434                 return 0;
 435
 436         /* override BSSID if necessary due to preauth */
 437         if (ctx->preauth_bssid)
 438                 memcpy(ctx->staging.bssid_addr, ctx->bssid, ETH_ALEN);
 439
 440         /* always get timestamp with Rx frame */
 441         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 442
 443         /*
 444          * force CTS-to-self frames protection if RTS-CTS is not preferred
 445          * one aggregation protection method
 446          */
 447         if (!(priv->cfg->ht_params &&
 448               priv->cfg->ht_params->use_rts_for_aggregation))
 449                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 450
 451         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 452             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 453                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 454         else
 455                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 456
 457         iwl_print_rx_config_cmd(priv, ctx->ctxid);
 458         ret = iwl_check_rxon_cmd(priv, ctx);
 459         if (ret) {
 460                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 461                 return -EINVAL;
 462         }
 463
 464         /*
 465          * receive commit_rxon request
 466          * abort any previous channel switch if still in process
 467          */
 468         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->shrd->status) &&
 469             (priv->switch_channel != ctx->staging.channel)) {
 470                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 471                               le16_to_cpu(priv->switch_channel));
 472                 iwl_chswitch_done(priv, false);
 473         }
 474
 475         /*
 476          * If we don't need to send a full RXON, we can use
 477          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 478          * and other flags for the current radio configuration.
 479          */
 480         if (!iwl_full_rxon_required(priv, ctx)) {
 481                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 482                 if (ret) {
 483                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 484                         return ret;
 485                 }
 486
 487                 memcpy(active, &ctx->staging, sizeof(*active));
 488                 /*
 489                  * We do not commit tx power settings while channel changing,
 490                  * do it now if after settings changed.
 491                  */
 492                 iwl_set_tx_power(priv, priv->tx_power_next, false);
 493
 494                 /* make sure we are in the right PS state */
 495                 iwl_power_update_mode(priv, true);
 496
 497                 return 0;
 498         }
 499
 500         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 501
 502         IWL_DEBUG_INFO(priv,
 503                        "Going to commit RXON\n"
 504                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 505                        "  * channel = %d\n"
 506                        "  * bssid = %pM\n",
 507                        (new_assoc ? "" : "out"),
 508                        le16_to_cpu(ctx->staging.channel),
 509                        ctx->staging.bssid_addr);
 510
 511         /*
 512          * Always clear associated first, but with the correct config.
 513          * This is required as for example station addition for the
 514          * AP station must be done after the BSSID is set to correctly
 515          * set up filters in the device.
 516          */
 517         ret = iwlagn_rxon_disconn(priv, ctx);
 518         if (ret)
 519                 return ret;
 520
 521         ret = iwlagn_set_pan_params(priv);
 522         if (ret)
 523                 return ret;
 524
 525         if (new_assoc)
 526                 return iwlagn_rxon_connect(priv, ctx);
 527
 528         return 0;
 529 }
 530
 531 void iwlagn_config_ht40(struct ieee80211_conf *conf,
 532         struct iwl_rxon_context *ctx)
 533 {
 534         if (conf_is_ht40_minus(conf)) {
 535                 ctx->ht.extension_chan_offset =
 536                         IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 537                 ctx->ht.is_40mhz = true;
 538         } else if (conf_is_ht40_plus(conf)) {
 539                 ctx->ht.extension_chan_offset =
 540                         IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 541                 ctx->ht.is_40mhz = true;
 542         } else {
 543                 ctx->ht.extension_chan_offset =
 544                         IEEE80211_HT_PARAM_CHA_SEC_NONE;
 545                 ctx->ht.is_40mhz = false;
 546         }
 547 }
 548
 549 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 550 {
 551         struct iwl_priv *priv = hw->priv;
 552         struct iwl_rxon_context *ctx;
 553         struct ieee80211_conf *conf = &hw->conf;
 554         struct ieee80211_channel *channel = conf->channel;
 555         const struct iwl_channel_info *ch_info;
 556         int ret = 0;
 557
 558         IWL_DEBUG_MAC80211(priv, "enter: changed %#x", changed);
 559
 560         mutex_lock(&priv->shrd->mutex);
 561
 562         if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 563                 goto out;
 564
 565         if (unlikely(test_bit(STATUS_SCANNING, &priv->shrd->status))) {
 566                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 567                 goto out;
 568         }
 569
 570         if (!iwl_is_ready(priv->shrd)) {
 571                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 572                 goto out;
 573         }
 574
 575         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 576                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 577                 /* mac80211 uses static for non-HT which is what we want */
 578                 priv->current_ht_config.smps = conf->smps_mode;
 579
 580                 /*
 581                  * Recalculate chain counts.
 582                  *
 583                  * If monitor mode is enabled then mac80211 will
 584                  * set up the SM PS mode to OFF if an HT channel is
 585                  * configured.
 586                  */
 587                 for_each_context(priv, ctx)
 588                         iwlagn_set_rxon_chain(priv, ctx);
 589         }
 590
 591         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 592                 unsigned long flags;
 593
 594                 ch_info = iwl_get_channel_info(priv, channel->band,
 595                                                channel->hw_value);
 596                 if (!is_channel_valid(ch_info)) {
 597                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 598                         ret = -EINVAL;
 599                         goto out;
 600                 }
 601
 602                 spin_lock_irqsave(&priv->shrd->lock, flags);
 603
 604                 for_each_context(priv, ctx) {
 605                         /* Configure HT40 channels */
 606                         if (ctx->ht.enabled != conf_is_ht(conf))
 607                                 ctx->ht.enabled = conf_is_ht(conf);
 608
 609                         if (ctx->ht.enabled) {
 610                                 /* if HT40 is used, it should not change
 611                                  * after associated except channel switch */
 612                                 if (!ctx->ht.is_40mhz ||
 613                                                 !iwl_is_associated_ctx(ctx))
 614                                         iwlagn_config_ht40(conf, ctx);
 615                         } else
 616                                 ctx->ht.is_40mhz = false;
 617
 618                         /*
 619                          * Default to no protection. Protection mode will
 620                          * later be set from BSS config in iwl_ht_conf
 621                          */
 622                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 623
 624                         /* if we are switching from ht to 2.4 clear flags
 625                          * from any ht related info since 2.4 does not
 626                          * support ht */
 627                         if (le16_to_cpu(ctx->staging.channel) !=
 628                             channel->hw_value)
 629                                 ctx->staging.flags = 0;
 630
 631                         iwl_set_rxon_channel(priv, channel, ctx);
 632                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 633
 634                         iwl_set_flags_for_band(priv, ctx, channel->band,
 635                                                ctx->vif);
 636                 }
 637
 638                 spin_unlock_irqrestore(&priv->shrd->lock, flags);
 639
 640                 iwl_update_bcast_stations(priv);
 641
 642                 /*
 643                  * The list of supported rates and rate mask can be different
 644                  * for each band; since the band may have changed, reset
 645                  * the rate mask to what mac80211 lists.
 646                  */
 647                 iwl_set_rate(priv);
 648         }
 649
 650         if (changed & (IEEE80211_CONF_CHANGE_PS |
 651                         IEEE80211_CONF_CHANGE_IDLE)) {
 652                 ret = iwl_power_update_mode(priv, false);
 653                 if (ret)
 654                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 655         }
 656
 657         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 658                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 659                         priv->tx_power_user_lmt, conf->power_level);
 660
 661                 iwl_set_tx_power(priv, conf->power_level, false);
 662         }
 663
 664         for_each_context(priv, ctx) {
 665                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 666                         continue;
 667                 iwlagn_commit_rxon(priv, ctx);
 668         }
 669  out:
 670         mutex_unlock(&priv->shrd->mutex);
 671         IWL_DEBUG_MAC80211(priv, "leave\n");
 672
 673         return ret;
 674 }
 675
 676 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 677                                        struct iwl_rxon_context *ctx,
 678                                        struct ieee80211_bss_conf *bss_conf)
 679 {
 680         struct ieee80211_vif *vif = ctx->vif;
 681         struct iwl_rxon_context *tmp;
 682         struct ieee80211_sta *sta;
 683         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 684         struct ieee80211_sta_ht_cap *ht_cap;
 685         bool need_multiple;
 686
 687         lockdep_assert_held(&priv->shrd->mutex);
 688
 689         switch (vif->type) {
 690         case NL80211_IFTYPE_STATION:
 691                 rcu_read_lock();
 692                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 693                 if (!sta) {
 694                         /*
 695                          * If at all, this can only happen through a race
 696                          * when the AP disconnects us while we're still
 697                          * setting up the connection, in that case mac80211
 698                          * will soon tell us about that.
 699                          */
 700                         need_multiple = false;
 701                         rcu_read_unlock();
 702                         break;
 703                 }
 704
 705                 ht_cap = &sta->ht_cap;
 706
 707                 need_multiple = true;
 708
 709                 /*
 710                  * If the peer advertises no support for receiving 2 and 3
 711                  * stream MCS rates, it can't be transmitting them either.
 712                  */
 713                 if (ht_cap->mcs.rx_mask[1] == 0 &&
 714                     ht_cap->mcs.rx_mask[2] == 0) {
 715                         need_multiple = false;
 716                 } else if (!(ht_cap->mcs.tx_params &
 717                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
 718                         /* If it can't TX MCS at all ... */
 719                         need_multiple = false;
 720                 } else if (ht_cap->mcs.tx_params &
 721                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
 722                         int maxstreams;
 723
 724                         /*
 725                          * But if it can receive them, it might still not
 726                          * be able to transmit them, which is what we need
 727                          * to check here -- so check the number of streams
 728                          * it advertises for TX (if different from RX).
 729                          */
 730
 731                         maxstreams = (ht_cap->mcs.tx_params &
 732                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
 733                         maxstreams >>=
 734                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 735                         maxstreams += 1;
 736
 737                         if (maxstreams <= 1)
 738                                 need_multiple = false;
 739                 }
 740
 741                 rcu_read_unlock();
 742                 break;
 743         case NL80211_IFTYPE_ADHOC:
 744                 /* currently */
 745                 need_multiple = false;
 746                 break;
 747         default:
 748                 /* only AP really */
 749                 need_multiple = true;
 750                 break;
 751         }
 752
 753         ctx->ht_need_multiple_chains = need_multiple;
 754
 755         if (!need_multiple) {
 756                 /* check all contexts */
 757                 for_each_context(priv, tmp) {
 758                         if (!tmp->vif)
 759                                 continue;
 760                         if (tmp->ht_need_multiple_chains) {
 761                                 need_multiple = true;
 762                                 break;
 763                         }
 764                 }
 765         }
 766
 767         ht_conf->single_chain_sufficient = !need_multiple;
 768 }
 769
 770 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 771 {
 772         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 773         int ret;
 774
 775         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
 776             iwl_is_any_associated(priv)) {
 777                 struct iwl_calib_chain_noise_reset_cmd cmd;
 778
 779                 /* clear data for chain noise calibration algorithm */
 780                 data->chain_noise_a = 0;
 781                 data->chain_noise_b = 0;
 782                 data->chain_noise_c = 0;
 783                 data->chain_signal_a = 0;
 784                 data->chain_signal_b = 0;
 785                 data->chain_signal_c = 0;
 786                 data->beacon_count = 0;
 787
 788                 memset(&cmd, 0, sizeof(cmd));
 789                 iwl_set_calib_hdr(&cmd.hdr,
 790                         priv->phy_calib_chain_noise_reset_cmd);
 791                 ret = iwl_trans_send_cmd_pdu(trans(priv),
 792                                         REPLY_PHY_CALIBRATION_CMD,
 793                                         CMD_SYNC, sizeof(cmd), &cmd);
 794                 if (ret)
 795                         IWL_ERR(priv,
 796                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 797                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 798                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 799         }
 800 }
 801
 802 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 803                              struct ieee80211_vif *vif,
 804                              struct ieee80211_bss_conf *bss_conf,
 805                              u32 changes)
 806 {
 807         struct iwl_priv *priv = hw->priv;
 808         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 809         int ret;
 810         bool force = false;
 811
 812         mutex_lock(&priv->shrd->mutex);
 813
 814         if (unlikely(!iwl_is_ready(priv->shrd))) {
 815                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 816                 mutex_unlock(&priv->shrd->mutex);
 817                 return;
 818         }
 819
 820         if (unlikely(!ctx->vif)) {
 821                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 822                 mutex_unlock(&priv->shrd->mutex);
 823                 return;
 824         }
 825
 826         if (changes & BSS_CHANGED_BEACON_INT)
 827                 force = true;
 828
 829         if (changes & BSS_CHANGED_QOS) {
 830                 ctx->qos_data.qos_active = bss_conf->qos;
 831                 iwlagn_update_qos(priv, ctx);
 832         }
 833
 834         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 835         if (vif->bss_conf.use_short_preamble)
 836                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 837         else
 838                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 839
 840         if (changes & BSS_CHANGED_ASSOC) {
 841                 if (bss_conf->assoc) {
 842                         priv->timestamp = bss_conf->timestamp;
 843                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 844                 } else {
 845                         /*
 846                          * If we disassociate while there are pending
 847                          * frames, just wake up the queues and let the
 848                          * frames "escape" ... This shouldn't really
 849                          * be happening to start with, but we should
 850                          * not get stuck in this case either since it
 851                          * can happen if userspace gets confused.
 852                          */
 853                         if (ctx->last_tx_rejected) {
 854                                 ctx->last_tx_rejected = false;
 855                                 iwl_trans_wake_any_queue(trans(priv),
 856                                                          ctx->ctxid);
 857                         }
 858                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 859
 860                         if (ctx->ctxid == IWL_RXON_CTX_BSS)
 861                                 priv->have_rekey_data = false;
 862                 }
 863
 864                 iwlagn_bt_coex_rssi_monitor(priv);
 865         }
 866
 867         if (ctx->ht.enabled) {
 868                 ctx->ht.protection = bss_conf->ht_operation_mode &
 869                                         IEEE80211_HT_OP_MODE_PROTECTION;
 870                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 871                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 872                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 873                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 874         }
 875
 876         iwlagn_set_rxon_chain(priv, ctx);
 877
 878         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 879                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 880         else
 881                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 882
 883         if (bss_conf->use_cts_prot)
 884                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 885         else
 886                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 887
 888         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 889
 890         if (vif->type == NL80211_IFTYPE_AP ||
 891             vif->type == NL80211_IFTYPE_ADHOC) {
 892                 if (vif->bss_conf.enable_beacon) {
 893                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 894                         priv->beacon_ctx = ctx;
 895                 } else {
 896                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 897                         priv->beacon_ctx = NULL;
 898                 }
 899         }
 900
 901         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 902                 iwlagn_commit_rxon(priv, ctx);
 903
 904         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
 905                 /*
 906                  * The chain noise calibration will enable PM upon
 907                  * completion. If calibration has already been run
 908                  * then we need to enable power management here.
 909                  */
 910                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
 911                         iwl_power_update_mode(priv, false);
 912
 913                 /* Enable RX differential gain and sensitivity calibrations */
 914                 if (!priv->disable_chain_noise_cal)
 915                         iwlagn_chain_noise_reset(priv);
 916                 priv->start_calib = 1;
 917                 WARN_ON(ctx->preauth_bssid);
 918         }
 919
 920         if (changes & BSS_CHANGED_IBSS) {
 921                 ret = iwlagn_manage_ibss_station(priv, vif,
 922                                                  bss_conf->ibss_joined);
 923                 if (ret)
 924                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 925                                 bss_conf->ibss_joined ? "add" : "remove",
 926                                 bss_conf->bssid);
 927         }
 928
 929         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 930             priv->beacon_ctx) {
 931                 if (iwlagn_update_beacon(priv, vif))
 932                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 933         }
 934
 935         mutex_unlock(&priv->shrd->mutex);
 936 }
 937
 938 void iwlagn_post_scan(struct iwl_priv *priv)
 939 {
 940         struct iwl_rxon_context *ctx;
 941
 942         /*
 943          * We do not commit power settings while scan is pending,
 944          * do it now if the settings changed.
 945          */
 946         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
 947         iwl_set_tx_power(priv, priv->tx_power_next, false);
 948
 949         /*
 950          * Since setting the RXON may have been deferred while
 951          * performing the scan, fire one off if needed
 952          */
 953         for_each_context(priv, ctx)
 954                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 955                         iwlagn_commit_rxon(priv, ctx);
 956
 957         iwlagn_set_pan_params(priv);
 958 }