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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2012 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_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
  43                                 CMD_SYNC, sizeof(*send), send);
  44
  45         send->filter_flags = old_filter;
  46
  47         if (ret)
  48                 IWL_DEBUG_QUIET_RFKILL(priv,
  49                         "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         static const u8 deactivate_cmd[] = {
  63                 REPLY_WIPAN_DEACTIVATION_COMPLETE
  64         };
  65
  66         iwl_init_notification_wait(&priv->notif_wait, &disable_wait,
  67                                    deactivate_cmd, ARRAY_SIZE(deactivate_cmd),
  68                                    NULL, NULL);
  69
  70         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  71         send->dev_type = RXON_DEV_TYPE_P2P;
  72         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
  73                                 CMD_SYNC, sizeof(*send), send);
  74
  75         send->filter_flags = old_filter;
  76         send->dev_type = old_dev_type;
  77
  78         if (ret) {
  79                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
  80                 iwl_remove_notification(&priv->notif_wait, &disable_wait);
  81         } else {
  82                 ret = iwl_wait_notification(&priv->notif_wait,
  83                                             &disable_wait, HZ);
  84                 if (ret)
  85                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
  86         }
  87
  88         return ret;
  89 }
  90
  91 static int iwlagn_disconn_pan(struct iwl_priv *priv,
  92                               struct iwl_rxon_context *ctx,
  93                               struct iwl_rxon_cmd *send)
  94 {
  95         __le32 old_filter = send->filter_flags;
  96         int ret;
  97
  98         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  99         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, CMD_SYNC,
 100                                 sizeof(*send), send);
 101
 102         send->filter_flags = old_filter;
 103
 104         return ret;
 105 }
 106
 107 static void iwlagn_update_qos(struct iwl_priv *priv,
 108                               struct iwl_rxon_context *ctx)
 109 {
 110         int ret;
 111
 112         if (!ctx->is_active)
 113                 return;
 114
 115         ctx->qos_data.def_qos_parm.qos_flags = 0;
 116
 117         if (ctx->qos_data.qos_active)
 118                 ctx->qos_data.def_qos_parm.qos_flags |=
 119                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 120
 121         if (ctx->ht.enabled)
 122                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 123
 124         IWL_DEBUG_INFO(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 125                       ctx->qos_data.qos_active,
 126                       ctx->qos_data.def_qos_parm.qos_flags);
 127
 128         ret = iwl_dvm_send_cmd_pdu(priv, ctx->qos_cmd, CMD_SYNC,
 129                                sizeof(struct iwl_qosparam_cmd),
 130                                &ctx->qos_data.def_qos_parm);
 131         if (ret)
 132                 IWL_DEBUG_QUIET_RFKILL(priv, "Failed to update QoS\n");
 133 }
 134
 135 static int iwlagn_update_beacon(struct iwl_priv *priv,
 136                                 struct ieee80211_vif *vif)
 137 {
 138         lockdep_assert_held(&priv->mutex);
 139
 140         dev_kfree_skb(priv->beacon_skb);
 141         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
 142         if (!priv->beacon_skb)
 143                 return -ENOMEM;
 144         return iwlagn_send_beacon_cmd(priv);
 145 }
 146
 147 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
 148                            struct iwl_rxon_context *ctx)
 149 {
 150         int ret = 0;
 151         struct iwl_rxon_assoc_cmd rxon_assoc;
 152         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
 153         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
 154
 155         if ((rxon1->flags == rxon2->flags) &&
 156             (rxon1->filter_flags == rxon2->filter_flags) &&
 157             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 158             (rxon1->ofdm_ht_single_stream_basic_rates ==
 159              rxon2->ofdm_ht_single_stream_basic_rates) &&
 160             (rxon1->ofdm_ht_dual_stream_basic_rates ==
 161              rxon2->ofdm_ht_dual_stream_basic_rates) &&
 162             (rxon1->ofdm_ht_triple_stream_basic_rates ==
 163              rxon2->ofdm_ht_triple_stream_basic_rates) &&
 164             (rxon1->acquisition_data == rxon2->acquisition_data) &&
 165             (rxon1->rx_chain == rxon2->rx_chain) &&
 166             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 167                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 168                 return 0;
 169         }
 170
 171         rxon_assoc.flags = ctx->staging.flags;
 172         rxon_assoc.filter_flags = ctx->staging.filter_flags;
 173         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
 174         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
 175         rxon_assoc.reserved1 = 0;
 176         rxon_assoc.reserved2 = 0;
 177         rxon_assoc.reserved3 = 0;
 178         rxon_assoc.ofdm_ht_single_stream_basic_rates =
 179             ctx->staging.ofdm_ht_single_stream_basic_rates;
 180         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 181             ctx->staging.ofdm_ht_dual_stream_basic_rates;
 182         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
 183         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 184                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
 185         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
 186
 187         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_assoc_cmd,
 188                                 CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
 189         return ret;
 190 }
 191
 192 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
 193                                struct iwl_rxon_context *ctx)
 194 {
 195         int ret;
 196         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 197
 198         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 199                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
 200         } else {
 201                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
 202                 if (ret)
 203                         return ret;
 204                 if (ctx->vif) {
 205                         ret = iwl_send_rxon_timing(priv, ctx);
 206                         if (ret) {
 207                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 208                                 return ret;
 209                         }
 210                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
 211                 }
 212         }
 213         if (ret)
 214                 return ret;
 215
 216         /*
 217          * Un-assoc RXON clears the station table and WEP
 218          * keys, so we have to restore those afterwards.
 219          */
 220         iwl_clear_ucode_stations(priv, ctx);
 221         /* update -- might need P2P now */
 222         iwl_update_bcast_station(priv, ctx);
 223         iwl_restore_stations(priv, ctx);
 224         ret = iwl_restore_default_wep_keys(priv, ctx);
 225         if (ret) {
 226                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 227                 return ret;
 228         }
 229
 230         memcpy(active, &ctx->staging, sizeof(*active));
 231         return 0;
 232 }
 233
 234 static int iwlagn_rxon_connect(struct iwl_priv *priv,
 235                                struct iwl_rxon_context *ctx)
 236 {
 237         int ret;
 238         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 239
 240         /* RXON timing must be before associated RXON */
 241         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 242                 ret = iwl_send_rxon_timing(priv, ctx);
 243                 if (ret) {
 244                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 245                         return ret;
 246                 }
 247         }
 248         /* QoS info may be cleared by previous un-assoc RXON */
 249         iwlagn_update_qos(priv, ctx);
 250
 251         /*
 252          * We'll run into this code path when beaconing is
 253          * enabled, but then we also need to send the beacon
 254          * to the device.
 255          */
 256         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 257                 ret = iwlagn_update_beacon(priv, ctx->vif);
 258                 if (ret) {
 259                         IWL_ERR(priv,
 260                                 "Error sending required beacon (%d)!\n",
 261                                 ret);
 262                         return ret;
 263                 }
 264         }
 265
 266         priv->start_calib = 0;
 267         /*
 268          * Apply the new configuration.
 269          *
 270          * Associated RXON doesn't clear the station table in uCode,
 271          * so we don't need to restore stations etc. after this.
 272          */
 273         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, CMD_SYNC,
 274                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 275         if (ret) {
 276                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 277                 return ret;
 278         }
 279         memcpy(active, &ctx->staging, sizeof(*active));
 280
 281         /* IBSS beacon needs to be sent after setting assoc */
 282         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 283                 if (iwlagn_update_beacon(priv, ctx->vif))
 284                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 285         iwl_init_sensitivity(priv);
 286
 287         /*
 288          * If we issue a new RXON command which required a tune then
 289          * we must send a new TXPOWER command or we won't be able to
 290          * Tx any frames.
 291          *
 292          * It's expected we set power here if channel is changing.
 293          */
 294         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 295         if (ret) {
 296                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 297                 return ret;
 298         }
 299
 300         if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
 301             cfg(priv)->ht_params && cfg(priv)->ht_params->smps_mode)
 302                 ieee80211_request_smps(ctx->vif,
 303                                        cfg(priv)->ht_params->smps_mode);
 304
 305         return 0;
 306 }
 307
 308 int iwlagn_set_pan_params(struct iwl_priv *priv)
 309 {
 310         struct iwl_wipan_params_cmd cmd;
 311         struct iwl_rxon_context *ctx_bss, *ctx_pan;
 312         int slot0 = 300, slot1 = 0;
 313         int ret;
 314
 315         if (priv->valid_contexts == BIT(IWL_RXON_CTX_BSS))
 316                 return 0;
 317
 318         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 319
 320         lockdep_assert_held(&priv->mutex);
 321
 322         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
 323         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
 324
 325         /*
 326          * If the PAN context is inactive, then we don't need
 327          * to update the PAN parameters, the last thing we'll
 328          * have done before it goes inactive is making the PAN
 329          * parameters be WLAN-only.
 330          */
 331         if (!ctx_pan->is_active)
 332                 return 0;
 333
 334         memset(&cmd, 0, sizeof(cmd));
 335
 336         /* only 2 slots are currently allowed */
 337         cmd.num_slots = 2;
 338
 339         cmd.slots[0].type = 0; /* BSS */
 340         cmd.slots[1].type = 1; /* PAN */
 341
 342         if (priv->hw_roc_setup) {
 343                 /* both contexts must be used for this to happen */
 344                 slot1 = IWL_MIN_SLOT_TIME;
 345                 slot0 = 3000;
 346         } else if (ctx_bss->vif && ctx_pan->vif) {
 347                 int bcnint = ctx_pan->beacon_int;
 348                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
 349
 350                 /* should be set, but seems unused?? */
 351                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
 352
 353                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
 354                     bcnint &&
 355                     bcnint != ctx_bss->beacon_int) {
 356                         IWL_ERR(priv,
 357                                 "beacon intervals don't match (%d, %d)\n",
 358                                 ctx_bss->beacon_int, ctx_pan->beacon_int);
 359                 } else
 360                         bcnint = max_t(int, bcnint,
 361                                        ctx_bss->beacon_int);
 362                 if (!bcnint)
 363                         bcnint = DEFAULT_BEACON_INTERVAL;
 364                 slot0 = bcnint / 2;
 365                 slot1 = bcnint - slot0;
 366
 367                 if (test_bit(STATUS_SCAN_HW, &priv->status) ||
 368                     (!ctx_bss->vif->bss_conf.idle &&
 369                      !ctx_bss->vif->bss_conf.assoc)) {
 370                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 371                         slot1 = IWL_MIN_SLOT_TIME;
 372                 } else if (!ctx_pan->vif->bss_conf.idle &&
 373                            !ctx_pan->vif->bss_conf.assoc) {
 374                         slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 375                         slot0 = IWL_MIN_SLOT_TIME;
 376                 }
 377         } else if (ctx_pan->vif) {
 378                 slot0 = 0;
 379                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
 380                                         ctx_pan->beacon_int;
 381                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
 382
 383                 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 384                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
 385                         slot1 = IWL_MIN_SLOT_TIME;
 386                 }
 387         }
 388
 389         cmd.slots[0].width = cpu_to_le16(slot0);
 390         cmd.slots[1].width = cpu_to_le16(slot1);
 391
 392         ret = iwl_dvm_send_cmd_pdu(priv, REPLY_WIPAN_PARAMS, CMD_SYNC,
 393                         sizeof(cmd), &cmd);
 394         if (ret)
 395                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
 396
 397         return ret;
 398 }
 399
 400 /**
 401  * iwlagn_commit_rxon - commit staging_rxon to hardware
 402  *
 403  * The RXON command in staging_rxon is committed to the hardware and
 404  * the active_rxon structure is updated with the new data.  This
 405  * function correctly transitions out of the RXON_ASSOC_MSK state if
 406  * a HW tune is required based on the RXON structure changes.
 407  *
 408  * The connect/disconnect flow should be as the following:
 409  *
 410  * 1. make sure send RXON command with association bit unset if not connect
 411  *      this should include the channel and the band for the candidate
 412  *      to be connected to
 413  * 2. Add Station before RXON association with the AP
 414  * 3. RXON_timing has to send before RXON for connection
 415  * 4. full RXON command - associated bit set
 416  * 5. use RXON_ASSOC command to update any flags changes
 417  */
 418 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 419 {
 420         /* cast away the const for active_rxon in this function */
 421         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 422         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 423         int ret;
 424
 425         lockdep_assert_held(&priv->mutex);
 426
 427         if (!iwl_is_alive(priv))
 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         /* always get timestamp with Rx frame */
 437         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 438
 439         /*
 440          * force CTS-to-self frames protection if RTS-CTS is not preferred
 441          * one aggregation protection method
 442          */
 443         if (!hw_params(priv).use_rts_for_aggregation)
 444                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 445
 446         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 447             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 448                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 449         else
 450                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 451
 452         iwl_print_rx_config_cmd(priv, ctx->ctxid);
 453         ret = iwl_check_rxon_cmd(priv, ctx);
 454         if (ret) {
 455                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 456                 return -EINVAL;
 457         }
 458
 459         /*
 460          * receive commit_rxon request
 461          * abort any previous channel switch if still in process
 462          */
 463         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
 464             (priv->switch_channel != ctx->staging.channel)) {
 465                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 466                               le16_to_cpu(priv->switch_channel));
 467                 iwl_chswitch_done(priv, false);
 468         }
 469
 470         /*
 471          * If we don't need to send a full RXON, we can use
 472          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 473          * and other flags for the current radio configuration.
 474          */
 475         if (!iwl_full_rxon_required(priv, ctx)) {
 476                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 477                 if (ret) {
 478                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 479                         return ret;
 480                 }
 481
 482                 memcpy(active, &ctx->staging, sizeof(*active));
 483                 /*
 484                  * We do not commit tx power settings while channel changing,
 485                  * do it now if after settings changed.
 486                  */
 487                 iwl_set_tx_power(priv, priv->tx_power_next, false);
 488
 489                 /* make sure we are in the right PS state */
 490                 iwl_power_update_mode(priv, true);
 491
 492                 return 0;
 493         }
 494
 495         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 496
 497         IWL_DEBUG_INFO(priv,
 498                        "Going to commit RXON\n"
 499                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 500                        "  * channel = %d\n"
 501                        "  * bssid = %pM\n",
 502                        (new_assoc ? "" : "out"),
 503                        le16_to_cpu(ctx->staging.channel),
 504                        ctx->staging.bssid_addr);
 505
 506         /*
 507          * Always clear associated first, but with the correct config.
 508          * This is required as for example station addition for the
 509          * AP station must be done after the BSSID is set to correctly
 510          * set up filters in the device.
 511          */
 512         ret = iwlagn_rxon_disconn(priv, ctx);
 513         if (ret)
 514                 return ret;
 515
 516         ret = iwlagn_set_pan_params(priv);
 517         if (ret)
 518                 return ret;
 519
 520         if (new_assoc)
 521                 return iwlagn_rxon_connect(priv, ctx);
 522
 523         return 0;
 524 }
 525
 526 void iwlagn_config_ht40(struct ieee80211_conf *conf,
 527         struct iwl_rxon_context *ctx)
 528 {
 529         if (conf_is_ht40_minus(conf)) {
 530                 ctx->ht.extension_chan_offset =
 531                         IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 532                 ctx->ht.is_40mhz = true;
 533         } else if (conf_is_ht40_plus(conf)) {
 534                 ctx->ht.extension_chan_offset =
 535                         IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 536                 ctx->ht.is_40mhz = true;
 537         } else {
 538                 ctx->ht.extension_chan_offset =
 539                         IEEE80211_HT_PARAM_CHA_SEC_NONE;
 540                 ctx->ht.is_40mhz = false;
 541         }
 542 }
 543
 544 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 545 {
 546         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 547         struct iwl_rxon_context *ctx;
 548         struct ieee80211_conf *conf = &hw->conf;
 549         struct ieee80211_channel *channel = conf->channel;
 550         const struct iwl_channel_info *ch_info;
 551         int ret = 0;
 552
 553         IWL_DEBUG_MAC80211(priv, "enter: changed %#x\n", changed);
 554
 555         mutex_lock(&priv->mutex);
 556
 557         if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
 558                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 559                 goto out;
 560         }
 561
 562         if (!iwl_is_ready(priv)) {
 563                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 564                 goto out;
 565         }
 566
 567         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 568                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 569                 /* mac80211 uses static for non-HT which is what we want */
 570                 priv->current_ht_config.smps = conf->smps_mode;
 571
 572                 /*
 573                  * Recalculate chain counts.
 574                  *
 575                  * If monitor mode is enabled then mac80211 will
 576                  * set up the SM PS mode to OFF if an HT channel is
 577                  * configured.
 578                  */
 579                 for_each_context(priv, ctx)
 580                         iwlagn_set_rxon_chain(priv, ctx);
 581         }
 582
 583         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 584                 ch_info = iwl_get_channel_info(priv, channel->band,
 585                                                channel->hw_value);
 586                 if (!is_channel_valid(ch_info)) {
 587                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 588                         ret = -EINVAL;
 589                         goto out;
 590                 }
 591
 592                 for_each_context(priv, ctx) {
 593                         /* Configure HT40 channels */
 594                         if (ctx->ht.enabled != conf_is_ht(conf))
 595                                 ctx->ht.enabled = conf_is_ht(conf);
 596
 597                         if (ctx->ht.enabled) {
 598                                 /* if HT40 is used, it should not change
 599                                  * after associated except channel switch */
 600                                 if (!ctx->ht.is_40mhz ||
 601                                                 !iwl_is_associated_ctx(ctx))
 602                                         iwlagn_config_ht40(conf, ctx);
 603                         } else
 604                                 ctx->ht.is_40mhz = false;
 605
 606                         /*
 607                          * Default to no protection. Protection mode will
 608                          * later be set from BSS config in iwl_ht_conf
 609                          */
 610                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 611
 612                         /* if we are switching from ht to 2.4 clear flags
 613                          * from any ht related info since 2.4 does not
 614                          * support ht */
 615                         if (le16_to_cpu(ctx->staging.channel) !=
 616                             channel->hw_value)
 617                                 ctx->staging.flags = 0;
 618
 619                         iwl_set_rxon_channel(priv, channel, ctx);
 620                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 621
 622                         iwl_set_flags_for_band(priv, ctx, channel->band,
 623                                                ctx->vif);
 624                 }
 625
 626                 iwl_update_bcast_stations(priv);
 627
 628                 /*
 629                  * The list of supported rates and rate mask can be different
 630                  * for each band; since the band may have changed, reset
 631                  * the rate mask to what mac80211 lists.
 632                  */
 633                 iwl_set_rate(priv);
 634         }
 635
 636         if (changed & (IEEE80211_CONF_CHANGE_PS |
 637                         IEEE80211_CONF_CHANGE_IDLE)) {
 638                 ret = iwl_power_update_mode(priv, false);
 639                 if (ret)
 640                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 641         }
 642
 643         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 644                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 645                         priv->tx_power_user_lmt, conf->power_level);
 646
 647                 iwl_set_tx_power(priv, conf->power_level, false);
 648         }
 649
 650         for_each_context(priv, ctx) {
 651                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 652                         continue;
 653                 iwlagn_commit_rxon(priv, ctx);
 654         }
 655  out:
 656         mutex_unlock(&priv->mutex);
 657         IWL_DEBUG_MAC80211(priv, "leave\n");
 658
 659         return ret;
 660 }
 661
 662 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 663                                        struct iwl_rxon_context *ctx,
 664                                        struct ieee80211_bss_conf *bss_conf)
 665 {
 666         struct ieee80211_vif *vif = ctx->vif;
 667         struct iwl_rxon_context *tmp;
 668         struct ieee80211_sta *sta;
 669         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 670         struct ieee80211_sta_ht_cap *ht_cap;
 671         bool need_multiple;
 672
 673         lockdep_assert_held(&priv->mutex);
 674
 675         switch (vif->type) {
 676         case NL80211_IFTYPE_STATION:
 677                 rcu_read_lock();
 678                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 679                 if (!sta) {
 680                         /*
 681                          * If at all, this can only happen through a race
 682                          * when the AP disconnects us while we're still
 683                          * setting up the connection, in that case mac80211
 684                          * will soon tell us about that.
 685                          */
 686                         need_multiple = false;
 687                         rcu_read_unlock();
 688                         break;
 689                 }
 690
 691                 ht_cap = &sta->ht_cap;
 692
 693                 need_multiple = true;
 694
 695                 /*
 696                  * If the peer advertises no support for receiving 2 and 3
 697                  * stream MCS rates, it can't be transmitting them either.
 698                  */
 699                 if (ht_cap->mcs.rx_mask[1] == 0 &&
 700                     ht_cap->mcs.rx_mask[2] == 0) {
 701                         need_multiple = false;
 702                 } else if (!(ht_cap->mcs.tx_params &
 703                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
 704                         /* If it can't TX MCS at all ... */
 705                         need_multiple = false;
 706                 } else if (ht_cap->mcs.tx_params &
 707                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
 708                         int maxstreams;
 709
 710                         /*
 711                          * But if it can receive them, it might still not
 712                          * be able to transmit them, which is what we need
 713                          * to check here -- so check the number of streams
 714                          * it advertises for TX (if different from RX).
 715                          */
 716
 717                         maxstreams = (ht_cap->mcs.tx_params &
 718                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
 719                         maxstreams >>=
 720                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 721                         maxstreams += 1;
 722
 723                         if (maxstreams <= 1)
 724                                 need_multiple = false;
 725                 }
 726
 727                 rcu_read_unlock();
 728                 break;
 729         case NL80211_IFTYPE_ADHOC:
 730                 /* currently */
 731                 need_multiple = false;
 732                 break;
 733         default:
 734                 /* only AP really */
 735                 need_multiple = true;
 736                 break;
 737         }
 738
 739         ctx->ht_need_multiple_chains = need_multiple;
 740
 741         if (!need_multiple) {
 742                 /* check all contexts */
 743                 for_each_context(priv, tmp) {
 744                         if (!tmp->vif)
 745                                 continue;
 746                         if (tmp->ht_need_multiple_chains) {
 747                                 need_multiple = true;
 748                                 break;
 749                         }
 750                 }
 751         }
 752
 753         ht_conf->single_chain_sufficient = !need_multiple;
 754 }
 755
 756 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 757 {
 758         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 759         int ret;
 760
 761         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
 762             iwl_is_any_associated(priv)) {
 763                 struct iwl_calib_chain_noise_reset_cmd cmd;
 764
 765                 /* clear data for chain noise calibration algorithm */
 766                 data->chain_noise_a = 0;
 767                 data->chain_noise_b = 0;
 768                 data->chain_noise_c = 0;
 769                 data->chain_signal_a = 0;
 770                 data->chain_signal_b = 0;
 771                 data->chain_signal_c = 0;
 772                 data->beacon_count = 0;
 773
 774                 memset(&cmd, 0, sizeof(cmd));
 775                 iwl_set_calib_hdr(&cmd.hdr,
 776                         priv->phy_calib_chain_noise_reset_cmd);
 777                 ret = iwl_dvm_send_cmd_pdu(priv,
 778                                         REPLY_PHY_CALIBRATION_CMD,
 779                                         CMD_SYNC, sizeof(cmd), &cmd);
 780                 if (ret)
 781                         IWL_ERR(priv,
 782                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 783                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 784                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 785         }
 786 }
 787
 788 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 789                              struct ieee80211_vif *vif,
 790                              struct ieee80211_bss_conf *bss_conf,
 791                              u32 changes)
 792 {
 793         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 794         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 795         int ret;
 796         bool force = false;
 797
 798         mutex_lock(&priv->mutex);
 799
 800         if (unlikely(!iwl_is_ready(priv))) {
 801                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 802                 mutex_unlock(&priv->mutex);
 803                 return;
 804         }
 805
 806         if (unlikely(!ctx->vif)) {
 807                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 808                 mutex_unlock(&priv->mutex);
 809                 return;
 810         }
 811
 812         if (changes & BSS_CHANGED_BEACON_INT)
 813                 force = true;
 814
 815         if (changes & BSS_CHANGED_QOS) {
 816                 ctx->qos_data.qos_active = bss_conf->qos;
 817                 iwlagn_update_qos(priv, ctx);
 818         }
 819
 820         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 821         if (vif->bss_conf.use_short_preamble)
 822                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 823         else
 824                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 825
 826         if (changes & BSS_CHANGED_ASSOC) {
 827                 if (bss_conf->assoc) {
 828                         priv->timestamp = bss_conf->last_tsf;
 829                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 830                 } else {
 831                         /*
 832                          * If we disassociate while there are pending
 833                          * frames, just wake up the queues and let the
 834                          * frames "escape" ... This shouldn't really
 835                          * be happening to start with, but we should
 836                          * not get stuck in this case either since it
 837                          * can happen if userspace gets confused.
 838                          */
 839                         iwlagn_lift_passive_no_rx(priv);
 840
 841                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 842
 843                         if (ctx->ctxid == IWL_RXON_CTX_BSS)
 844                                 priv->have_rekey_data = false;
 845                 }
 846
 847                 iwlagn_bt_coex_rssi_monitor(priv);
 848         }
 849
 850         if (ctx->ht.enabled) {
 851                 ctx->ht.protection = bss_conf->ht_operation_mode &
 852                                         IEEE80211_HT_OP_MODE_PROTECTION;
 853                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 854                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 855                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 856                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 857         }
 858
 859         iwlagn_set_rxon_chain(priv, ctx);
 860
 861         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 862                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 863         else
 864                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 865
 866         if (bss_conf->use_cts_prot)
 867                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 868         else
 869                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 870
 871         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 872
 873         if (vif->type == NL80211_IFTYPE_AP ||
 874             vif->type == NL80211_IFTYPE_ADHOC) {
 875                 if (vif->bss_conf.enable_beacon) {
 876                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 877                         priv->beacon_ctx = ctx;
 878                 } else {
 879                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 880                         priv->beacon_ctx = NULL;
 881                 }
 882         }
 883
 884         /*
 885          * If the ucode decides to do beacon filtering before
 886          * association, it will lose beacons that are needed
 887          * before sending frames out on passive channels. This
 888          * causes association failures on those channels. Enable
 889          * receiving beacons in such cases.
 890          */
 891
 892         if (vif->type == NL80211_IFTYPE_STATION) {
 893                 if (!bss_conf->assoc)
 894                         ctx->staging.filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
 895                 else
 896                         ctx->staging.filter_flags &=
 897                                                     ~RXON_FILTER_BCON_AWARE_MSK;
 898         }
 899
 900         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 901                 iwlagn_commit_rxon(priv, ctx);
 902
 903         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
 904                 /*
 905                  * The chain noise calibration will enable PM upon
 906                  * completion. If calibration has already been run
 907                  * then we need to enable power management here.
 908                  */
 909                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
 910                         iwl_power_update_mode(priv, false);
 911
 912                 /* Enable RX differential gain and sensitivity calibrations */
 913                 if (!priv->disable_chain_noise_cal)
 914                         iwlagn_chain_noise_reset(priv);
 915                 priv->start_calib = 1;
 916         }
 917
 918         if (changes & BSS_CHANGED_IBSS) {
 919                 ret = iwlagn_manage_ibss_station(priv, vif,
 920                                                  bss_conf->ibss_joined);
 921                 if (ret)
 922                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 923                                 bss_conf->ibss_joined ? "add" : "remove",
 924                                 bss_conf->bssid);
 925         }
 926
 927         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 928             priv->beacon_ctx) {
 929                 if (iwlagn_update_beacon(priv, vif))
 930                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 931         }
 932
 933         mutex_unlock(&priv->mutex);
 934 }
 935
 936 void iwlagn_post_scan(struct iwl_priv *priv)
 937 {
 938         struct iwl_rxon_context *ctx;
 939
 940         /*
 941          * We do not commit power settings while scan is pending,
 942          * do it now if the settings changed.
 943          */
 944         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
 945         iwl_set_tx_power(priv, priv->tx_power_next, false);
 946
 947         /*
 948          * Since setting the RXON may have been deferred while
 949          * performing the scan, fire one off if needed
 950          */
 951         for_each_context(priv, ctx)
 952                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 953                         iwlagn_commit_rxon(priv, ctx);
 954
 955         iwlagn_set_pan_params(priv);
 956 }