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-sta.h"
  30 #include "iwl-core.h"
  31 #include "iwl-agn-calib.h"
  32 #include "iwl-helpers.h"
  33 #include "iwl-trans.h"
  34
  35 static int iwlagn_disable_bss(struct iwl_priv *priv,
  36                               struct iwl_rxon_context *ctx,
  37                               struct iwl_rxon_cmd *send)
  38 {
  39         __le32 old_filter = send->filter_flags;
  40         int ret;
  41
  42         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  43         ret = trans_send_cmd_pdu(&priv->trans, ctx->rxon_cmd,
  44                                 CMD_SYNC, sizeof(*send), send);
  45
  46         send->filter_flags = old_filter;
  47
  48         if (ret)
  49                 IWL_ERR(priv, "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
  50
  51         return ret;
  52 }
  53
  54 static int iwlagn_disable_pan(struct iwl_priv *priv,
  55                               struct iwl_rxon_context *ctx,
  56                               struct iwl_rxon_cmd *send)
  57 {
  58         struct iwl_notification_wait disable_wait;
  59         __le32 old_filter = send->filter_flags;
  60         u8 old_dev_type = send->dev_type;
  61         int ret;
  62
  63         iwlagn_init_notification_wait(priv, &disable_wait,
  64                                       REPLY_WIPAN_DEACTIVATION_COMPLETE,
  65                                       NULL, NULL);
  66
  67         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  68         send->dev_type = RXON_DEV_TYPE_P2P;
  69         ret = trans_send_cmd_pdu(&priv->trans, ctx->rxon_cmd,
  70                                 CMD_SYNC, sizeof(*send), send);
  71
  72         send->filter_flags = old_filter;
  73         send->dev_type = old_dev_type;
  74
  75         if (ret) {
  76                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
  77                 iwlagn_remove_notification(priv, &disable_wait);
  78         } else {
  79                 ret = iwlagn_wait_notification(priv, &disable_wait, HZ);
  80                 if (ret)
  81                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
  82         }
  83
  84         return ret;
  85 }
  86
  87 static int iwlagn_disconn_pan(struct iwl_priv *priv,
  88                               struct iwl_rxon_context *ctx,
  89                               struct iwl_rxon_cmd *send)
  90 {
  91         __le32 old_filter = send->filter_flags;
  92         int ret;
  93
  94         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  95         ret = trans_send_cmd_pdu(&priv->trans, ctx->rxon_cmd, CMD_SYNC,
  96                                 sizeof(*send), send);
  97
  98         send->filter_flags = old_filter;
  99
 100         return ret;
 101 }
 102
 103 static void iwlagn_update_qos(struct iwl_priv *priv,
 104                               struct iwl_rxon_context *ctx)
 105 {
 106         int ret;
 107
 108         if (!ctx->is_active)
 109                 return;
 110
 111         ctx->qos_data.def_qos_parm.qos_flags = 0;
 112
 113         if (ctx->qos_data.qos_active)
 114                 ctx->qos_data.def_qos_parm.qos_flags |=
 115                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 116
 117         if (ctx->ht.enabled)
 118                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 119
 120         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 121                       ctx->qos_data.qos_active,
 122                       ctx->qos_data.def_qos_parm.qos_flags);
 123
 124         ret = trans_send_cmd_pdu(&priv->trans, ctx->qos_cmd, CMD_SYNC,
 125                                sizeof(struct iwl_qosparam_cmd),
 126                                &ctx->qos_data.def_qos_parm);
 127         if (ret)
 128                 IWL_ERR(priv, "Failed to update QoS\n");
 129 }
 130
 131 static int iwlagn_update_beacon(struct iwl_priv *priv,
 132                                 struct ieee80211_vif *vif)
 133 {
 134         lockdep_assert_held(&priv->mutex);
 135
 136         dev_kfree_skb(priv->beacon_skb);
 137         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
 138         if (!priv->beacon_skb)
 139                 return -ENOMEM;
 140         return iwlagn_send_beacon_cmd(priv);
 141 }
 142
 143 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
 144                            struct iwl_rxon_context *ctx)
 145 {
 146         int ret = 0;
 147         struct iwl_rxon_assoc_cmd rxon_assoc;
 148         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
 149         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
 150
 151         if ((rxon1->flags == rxon2->flags) &&
 152             (rxon1->filter_flags == rxon2->filter_flags) &&
 153             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 154             (rxon1->ofdm_ht_single_stream_basic_rates ==
 155              rxon2->ofdm_ht_single_stream_basic_rates) &&
 156             (rxon1->ofdm_ht_dual_stream_basic_rates ==
 157              rxon2->ofdm_ht_dual_stream_basic_rates) &&
 158             (rxon1->ofdm_ht_triple_stream_basic_rates ==
 159              rxon2->ofdm_ht_triple_stream_basic_rates) &&
 160             (rxon1->acquisition_data == rxon2->acquisition_data) &&
 161             (rxon1->rx_chain == rxon2->rx_chain) &&
 162             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 163                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 164                 return 0;
 165         }
 166
 167         rxon_assoc.flags = ctx->staging.flags;
 168         rxon_assoc.filter_flags = ctx->staging.filter_flags;
 169         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
 170         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
 171         rxon_assoc.reserved1 = 0;
 172         rxon_assoc.reserved2 = 0;
 173         rxon_assoc.reserved3 = 0;
 174         rxon_assoc.ofdm_ht_single_stream_basic_rates =
 175             ctx->staging.ofdm_ht_single_stream_basic_rates;
 176         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 177             ctx->staging.ofdm_ht_dual_stream_basic_rates;
 178         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
 179         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 180                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
 181         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
 182
 183         ret = trans_send_cmd_pdu(&priv->trans, ctx->rxon_assoc_cmd,
 184                                 CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
 185         return ret;
 186 }
 187
 188 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
 189                                struct iwl_rxon_context *ctx)
 190 {
 191         int ret;
 192         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 193
 194         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 195                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
 196         } else {
 197                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
 198                 if (ret)
 199                         return ret;
 200                 if (ctx->vif) {
 201                         ret = iwl_send_rxon_timing(priv, ctx);
 202                         if (ret) {
 203                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 204                                 return ret;
 205                         }
 206                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
 207                 }
 208         }
 209         if (ret)
 210                 return ret;
 211
 212         /*
 213          * Un-assoc RXON clears the station table and WEP
 214          * keys, so we have to restore those afterwards.
 215          */
 216         iwl_clear_ucode_stations(priv, ctx);
 217         /* update -- might need P2P now */
 218         iwl_update_bcast_station(priv, ctx);
 219         iwl_restore_stations(priv, ctx);
 220         ret = iwl_restore_default_wep_keys(priv, ctx);
 221         if (ret) {
 222                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 223                 return ret;
 224         }
 225
 226         memcpy(active, &ctx->staging, sizeof(*active));
 227         return 0;
 228 }
 229
 230 static int iwlagn_rxon_connect(struct iwl_priv *priv,
 231                                struct iwl_rxon_context *ctx)
 232 {
 233         int ret;
 234         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 235
 236         /* RXON timing must be before associated RXON */
 237         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 238                 ret = iwl_send_rxon_timing(priv, ctx);
 239                 if (ret) {
 240                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 241                         return ret;
 242                 }
 243         }
 244         /* QoS info may be cleared by previous un-assoc RXON */
 245         iwlagn_update_qos(priv, ctx);
 246
 247         /*
 248          * We'll run into this code path when beaconing is
 249          * enabled, but then we also need to send the beacon
 250          * to the device.
 251          */
 252         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 253                 ret = iwlagn_update_beacon(priv, ctx->vif);
 254                 if (ret) {
 255                         IWL_ERR(priv,
 256                                 "Error sending required beacon (%d)!\n",
 257                                 ret);
 258                         return ret;
 259                 }
 260         }
 261
 262         priv->start_calib = 0;
 263         /*
 264          * Apply the new configuration.
 265          *
 266          * Associated RXON doesn't clear the station table in uCode,
 267          * so we don't need to restore stations etc. after this.
 268          */
 269         ret = trans_send_cmd_pdu(&priv->trans, ctx->rxon_cmd, CMD_SYNC,
 270                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 271         if (ret) {
 272                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 273                 return ret;
 274         }
 275         memcpy(active, &ctx->staging, sizeof(*active));
 276
 277         iwl_reprogram_ap_sta(priv, ctx);
 278
 279         /* IBSS beacon needs to be sent after setting assoc */
 280         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 281                 if (iwlagn_update_beacon(priv, ctx->vif))
 282                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 283         iwl_init_sensitivity(priv);
 284
 285         /*
 286          * If we issue a new RXON command which required a tune then
 287          * we must send a new TXPOWER command or we won't be able to
 288          * Tx any frames.
 289          *
 290          * It's expected we set power here if channel is changing.
 291          */
 292         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 293         if (ret) {
 294                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 295                 return ret;
 296         }
 297
 298         if ((ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION) &&
 299             priv->cfg->ht_params->smps_mode)
 300                 ieee80211_request_smps(ctx->vif,
 301                                        priv->cfg->ht_params->smps_mode);
 302
 303         return 0;
 304 }
 305
 306 int iwlagn_set_pan_params(struct iwl_priv *priv)
 307 {
 308         struct iwl_wipan_params_cmd cmd;
 309         struct iwl_rxon_context *ctx_bss, *ctx_pan;
 310         int slot0 = 300, slot1 = 0;
 311         int ret;
 312
 313         if (priv->valid_contexts == BIT(IWL_RXON_CTX_BSS))
 314                 return 0;
 315
 316         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 317
 318         lockdep_assert_held(&priv->mutex);
 319
 320         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
 321         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
 322
 323         /*
 324          * If the PAN context is inactive, then we don't need
 325          * to update the PAN parameters, the last thing we'll
 326          * have done before it goes inactive is making the PAN
 327          * parameters be WLAN-only.
 328          */
 329         if (!ctx_pan->is_active)
 330                 return 0;
 331
 332         memset(&cmd, 0, sizeof(cmd));
 333
 334         /* only 2 slots are currently allowed */
 335         cmd.num_slots = 2;
 336
 337         cmd.slots[0].type = 0; /* BSS */
 338         cmd.slots[1].type = 1; /* PAN */
 339
 340         if (priv->hw_roc_channel) {
 341                 /* both contexts must be used for this to happen */
 342                 slot1 = priv->hw_roc_duration;
 343                 slot0 = IWL_MIN_SLOT_TIME;
 344         } else if (ctx_bss->vif && ctx_pan->vif) {
 345                 int bcnint = ctx_pan->vif->bss_conf.beacon_int;
 346                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
 347
 348                 /* should be set, but seems unused?? */
 349                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
 350
 351                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
 352                     bcnint &&
 353                     bcnint != ctx_bss->vif->bss_conf.beacon_int) {
 354                         IWL_ERR(priv,
 355                                 "beacon intervals don't match (%d, %d)\n",
 356                                 ctx_bss->vif->bss_conf.beacon_int,
 357                                 ctx_pan->vif->bss_conf.beacon_int);
 358                 } else
 359                         bcnint = max_t(int, bcnint,
 360                                        ctx_bss->vif->bss_conf.beacon_int);
 361                 if (!bcnint)
 362                         bcnint = DEFAULT_BEACON_INTERVAL;
 363                 slot0 = bcnint / 2;
 364                 slot1 = bcnint - slot0;
 365
 366                 if (test_bit(STATUS_SCAN_HW, &priv->status) ||
 367                     (!ctx_bss->vif->bss_conf.idle &&
 368                      !ctx_bss->vif->bss_conf.assoc)) {
 369                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 370                         slot1 = IWL_MIN_SLOT_TIME;
 371                 } else if (!ctx_pan->vif->bss_conf.idle &&
 372                            !ctx_pan->vif->bss_conf.assoc) {
 373                         slot1 = bcnint * 3 - IWL_MIN_SLOT_TIME;
 374                         slot0 = IWL_MIN_SLOT_TIME;
 375                 }
 376         } else if (ctx_pan->vif) {
 377                 slot0 = 0;
 378                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
 379                                         ctx_pan->vif->bss_conf.beacon_int;
 380                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
 381
 382                 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 383                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
 384                         slot1 = IWL_MIN_SLOT_TIME;
 385                 }
 386         }
 387
 388         cmd.slots[0].width = cpu_to_le16(slot0);
 389         cmd.slots[1].width = cpu_to_le16(slot1);
 390
 391         ret = trans_send_cmd_pdu(&priv->trans, REPLY_WIPAN_PARAMS, CMD_SYNC,
 392                         sizeof(cmd), &cmd);
 393         if (ret)
 394                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
 395
 396         return ret;
 397 }
 398
 399 /**
 400  * iwlagn_commit_rxon - commit staging_rxon to hardware
 401  *
 402  * The RXON command in staging_rxon is committed to the hardware and
 403  * the active_rxon structure is updated with the new data.  This
 404  * function correctly transitions out of the RXON_ASSOC_MSK state if
 405  * a HW tune is required based on the RXON structure changes.
 406  *
 407  * The connect/disconnect flow should be as the following:
 408  *
 409  * 1. make sure send RXON command with association bit unset if not connect
 410  *      this should include the channel and the band for the candidate
 411  *      to be connected to
 412  * 2. Add Station before RXON association with the AP
 413  * 3. RXON_timing has to send before RXON for connection
 414  * 4. full RXON command - associated bit set
 415  * 5. use RXON_ASSOC command to update any flags changes
 416  */
 417 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 418 {
 419         /* cast away the const for active_rxon in this function */
 420         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 421         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 422         int ret;
 423
 424         lockdep_assert_held(&priv->mutex);
 425
 426         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 427                 return -EINVAL;
 428
 429         if (!iwl_is_alive(priv))
 430                 return -EBUSY;
 431
 432         /* This function hardcodes a bunch of dual-mode assumptions */
 433         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 434
 435         if (!ctx->is_active)
 436                 return 0;
 437
 438         /* always get timestamp with Rx frame */
 439         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 440
 441         if (ctx->ctxid == IWL_RXON_CTX_PAN && priv->hw_roc_channel) {
 442                 struct ieee80211_channel *chan = priv->hw_roc_channel;
 443
 444                 iwl_set_rxon_channel(priv, chan, ctx);
 445                 iwl_set_flags_for_band(priv, ctx, chan->band, NULL);
 446                 ctx->staging.filter_flags |=
 447                         RXON_FILTER_ASSOC_MSK |
 448                         RXON_FILTER_PROMISC_MSK |
 449                         RXON_FILTER_CTL2HOST_MSK;
 450                 ctx->staging.dev_type = RXON_DEV_TYPE_P2P;
 451                 new_assoc = true;
 452
 453                 if (memcmp(&ctx->staging, &ctx->active,
 454                            sizeof(ctx->staging)) == 0)
 455                         return 0;
 456         }
 457
 458         /*
 459          * force CTS-to-self frames protection if RTS-CTS is not preferred
 460          * one aggregation protection method
 461          */
 462         if (!(priv->cfg->ht_params &&
 463               priv->cfg->ht_params->use_rts_for_aggregation))
 464                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 465
 466         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 467             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 468                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 469         else
 470                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 471
 472         iwl_print_rx_config_cmd(priv, ctx);
 473         ret = iwl_check_rxon_cmd(priv, ctx);
 474         if (ret) {
 475                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 476                 return -EINVAL;
 477         }
 478
 479         /*
 480          * receive commit_rxon request
 481          * abort any previous channel switch if still in process
 482          */
 483         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
 484             (priv->switch_channel != ctx->staging.channel)) {
 485                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 486                               le16_to_cpu(priv->switch_channel));
 487                 iwl_chswitch_done(priv, false);
 488         }
 489
 490         /*
 491          * If we don't need to send a full RXON, we can use
 492          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 493          * and other flags for the current radio configuration.
 494          */
 495         if (!iwl_full_rxon_required(priv, ctx)) {
 496                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 497                 if (ret) {
 498                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 499                         return ret;
 500                 }
 501
 502                 memcpy(active, &ctx->staging, sizeof(*active));
 503                 /*
 504                  * We do not commit tx power settings while channel changing,
 505                  * do it now if after settings changed.
 506                  */
 507                 iwl_set_tx_power(priv, priv->tx_power_next, false);
 508
 509                 /* make sure we are in the right PS state */
 510                 iwl_power_update_mode(priv, true);
 511
 512                 return 0;
 513         }
 514
 515         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 516
 517         IWL_DEBUG_INFO(priv,
 518                        "Going to commit RXON\n"
 519                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 520                        "  * channel = %d\n"
 521                        "  * bssid = %pM\n",
 522                        (new_assoc ? "" : "out"),
 523                        le16_to_cpu(ctx->staging.channel),
 524                        ctx->staging.bssid_addr);
 525
 526         /*
 527          * Always clear associated first, but with the correct config.
 528          * This is required as for example station addition for the
 529          * AP station must be done after the BSSID is set to correctly
 530          * set up filters in the device.
 531          */
 532         ret = iwlagn_rxon_disconn(priv, ctx);
 533         if (ret)
 534                 return ret;
 535
 536         ret = iwlagn_set_pan_params(priv);
 537         if (ret)
 538                 return ret;
 539
 540         if (new_assoc)
 541                 return iwlagn_rxon_connect(priv, ctx);
 542
 543         return 0;
 544 }
 545
 546 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 547 {
 548         struct iwl_priv *priv = hw->priv;
 549         struct iwl_rxon_context *ctx;
 550         struct ieee80211_conf *conf = &hw->conf;
 551         struct ieee80211_channel *channel = conf->channel;
 552         const struct iwl_channel_info *ch_info;
 553         int ret = 0;
 554
 555         IWL_DEBUG_MAC80211(priv, "changed %#x", changed);
 556
 557         mutex_lock(&priv->mutex);
 558
 559         if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
 560                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 561                 goto out;
 562         }
 563
 564         if (!iwl_is_ready(priv)) {
 565                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 566                 goto out;
 567         }
 568
 569         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 570                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 571                 /* mac80211 uses static for non-HT which is what we want */
 572                 priv->current_ht_config.smps = conf->smps_mode;
 573
 574                 /*
 575                  * Recalculate chain counts.
 576                  *
 577                  * If monitor mode is enabled then mac80211 will
 578                  * set up the SM PS mode to OFF if an HT channel is
 579                  * configured.
 580                  */
 581                 for_each_context(priv, ctx)
 582                         iwlagn_set_rxon_chain(priv, ctx);
 583         }
 584
 585         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 586                 unsigned long flags;
 587
 588                 ch_info = iwl_get_channel_info(priv, channel->band,
 589                                                channel->hw_value);
 590                 if (!is_channel_valid(ch_info)) {
 591                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 592                         ret = -EINVAL;
 593                         goto out;
 594                 }
 595
 596                 spin_lock_irqsave(&priv->lock, flags);
 597
 598                 for_each_context(priv, ctx) {
 599                         /* Configure HT40 channels */
 600                         if (ctx->ht.enabled != conf_is_ht(conf))
 601                                 ctx->ht.enabled = conf_is_ht(conf);
 602
 603                         if (ctx->ht.enabled) {
 604                                 if (conf_is_ht40_minus(conf)) {
 605                                         ctx->ht.extension_chan_offset =
 606                                                 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 607                                         ctx->ht.is_40mhz = true;
 608                                 } else if (conf_is_ht40_plus(conf)) {
 609                                         ctx->ht.extension_chan_offset =
 610                                                 IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 611                                         ctx->ht.is_40mhz = true;
 612                                 } else {
 613                                         ctx->ht.extension_chan_offset =
 614                                                 IEEE80211_HT_PARAM_CHA_SEC_NONE;
 615                                         ctx->ht.is_40mhz = false;
 616                                 }
 617                         } else
 618                                 ctx->ht.is_40mhz = false;
 619
 620                         /*
 621                          * Default to no protection. Protection mode will
 622                          * later be set from BSS config in iwl_ht_conf
 623                          */
 624                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 625
 626                         /* if we are switching from ht to 2.4 clear flags
 627                          * from any ht related info since 2.4 does not
 628                          * support ht */
 629                         if (le16_to_cpu(ctx->staging.channel) !=
 630                             channel->hw_value)
 631                                 ctx->staging.flags = 0;
 632
 633                         iwl_set_rxon_channel(priv, channel, ctx);
 634                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 635
 636                         iwl_set_flags_for_band(priv, ctx, channel->band,
 637                                                ctx->vif);
 638                 }
 639
 640                 spin_unlock_irqrestore(&priv->lock, flags);
 641
 642                 iwl_update_bcast_stations(priv);
 643
 644                 /*
 645                  * The list of supported rates and rate mask can be different
 646                  * for each band; since the band may have changed, reset
 647                  * the rate mask to what mac80211 lists.
 648                  */
 649                 iwl_set_rate(priv);
 650         }
 651
 652         if (changed & (IEEE80211_CONF_CHANGE_PS |
 653                         IEEE80211_CONF_CHANGE_IDLE)) {
 654                 ret = iwl_power_update_mode(priv, false);
 655                 if (ret)
 656                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 657         }
 658
 659         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 660                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 661                         priv->tx_power_user_lmt, conf->power_level);
 662
 663                 iwl_set_tx_power(priv, conf->power_level, false);
 664         }
 665
 666         for_each_context(priv, ctx) {
 667                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 668                         continue;
 669                 iwlagn_commit_rxon(priv, ctx);
 670         }
 671  out:
 672         mutex_unlock(&priv->mutex);
 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->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 = trans_send_cmd_pdu(&priv->trans,
 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->mutex);
 813
 814         if (unlikely(!iwl_is_ready(priv))) {
 815                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 816                 mutex_unlock(&priv->mutex);
 817                 return;
 818         }
 819
 820         if (unlikely(!ctx->vif)) {
 821                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 822                 mutex_unlock(&priv->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_wake_any_queue(priv, ctx);
 856                         }
 857                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 858                 }
 859
 860                 iwlagn_bt_coex_rssi_monitor(priv);
 861         }
 862
 863         if (ctx->ht.enabled) {
 864                 ctx->ht.protection = bss_conf->ht_operation_mode &
 865                                         IEEE80211_HT_OP_MODE_PROTECTION;
 866                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 867                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 868                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 869                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 870         }
 871
 872         iwlagn_set_rxon_chain(priv, ctx);
 873
 874         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 875                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 876         else
 877                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 878
 879         if (bss_conf->use_cts_prot)
 880                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 881         else
 882                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 883
 884         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 885
 886         if (vif->type == NL80211_IFTYPE_AP ||
 887             vif->type == NL80211_IFTYPE_ADHOC) {
 888                 if (vif->bss_conf.enable_beacon) {
 889                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 890                         priv->beacon_ctx = ctx;
 891                 } else {
 892                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 893                         priv->beacon_ctx = NULL;
 894                 }
 895         }
 896
 897         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 898                 iwlagn_commit_rxon(priv, ctx);
 899
 900         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
 901                 /*
 902                  * The chain noise calibration will enable PM upon
 903                  * completion. If calibration has already been run
 904                  * then we need to enable power management here.
 905                  */
 906                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
 907                         iwl_power_update_mode(priv, false);
 908
 909                 /* Enable RX differential gain and sensitivity calibrations */
 910                 if (!priv->disable_chain_noise_cal)
 911                         iwlagn_chain_noise_reset(priv);
 912                 priv->start_calib = 1;
 913         }
 914
 915         if (changes & BSS_CHANGED_IBSS) {
 916                 ret = iwlagn_manage_ibss_station(priv, vif,
 917                                                  bss_conf->ibss_joined);
 918                 if (ret)
 919                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 920                                 bss_conf->ibss_joined ? "add" : "remove",
 921                                 bss_conf->bssid);
 922         }
 923
 924         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 925             priv->beacon_ctx) {
 926                 if (iwlagn_update_beacon(priv, vif))
 927                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 928         }
 929
 930         mutex_unlock(&priv->mutex);
 931 }
 932
 933 void iwlagn_post_scan(struct iwl_priv *priv)
 934 {
 935         struct iwl_rxon_context *ctx;
 936
 937         /*
 938          * We do not commit power settings while scan is pending,
 939          * do it now if the settings changed.
 940          */
 941         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
 942         iwl_set_tx_power(priv, priv->tx_power_next, false);
 943
 944         /*
 945          * Since setting the RXON may have been deferred while
 946          * performing the scan, fire one off if needed
 947          */
 948         for_each_context(priv, ctx)
 949                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 950                         iwlagn_commit_rxon(priv, ctx);
 951
 952         iwlagn_set_pan_params(priv);
 953 }