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
  63         iwl_init_notification_wait(&priv->notif_wait, &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 = iwl_dvm_send_cmd_pdu(priv, 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                 iwl_remove_notification(&priv->notif_wait, &disable_wait);
  78         } else {
  79                 ret = iwl_wait_notification(&priv->notif_wait,
  80                                             &disable_wait, HZ);
  81                 if (ret)
  82                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
  83         }
  84
  85         return ret;
  86 }
  87
  88 static int iwlagn_disconn_pan(struct iwl_priv *priv,
  89                               struct iwl_rxon_context *ctx,
  90                               struct iwl_rxon_cmd *send)
  91 {
  92         __le32 old_filter = send->filter_flags;
  93         int ret;
  94
  95         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  96         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, CMD_SYNC,
  97                                 sizeof(*send), send);
  98
  99         send->filter_flags = old_filter;
 100
 101         return ret;
 102 }
 103
 104 static void iwlagn_update_qos(struct iwl_priv *priv,
 105                               struct iwl_rxon_context *ctx)
 106 {
 107         int ret;
 108
 109         if (!ctx->is_active)
 110                 return;
 111
 112         ctx->qos_data.def_qos_parm.qos_flags = 0;
 113
 114         if (ctx->qos_data.qos_active)
 115                 ctx->qos_data.def_qos_parm.qos_flags |=
 116                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 117
 118         if (ctx->ht.enabled)
 119                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 120
 121         IWL_DEBUG_INFO(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 122                       ctx->qos_data.qos_active,
 123                       ctx->qos_data.def_qos_parm.qos_flags);
 124
 125         ret = iwl_dvm_send_cmd_pdu(priv, ctx->qos_cmd, CMD_SYNC,
 126                                sizeof(struct iwl_qosparam_cmd),
 127                                &ctx->qos_data.def_qos_parm);
 128         if (ret)
 129                 IWL_DEBUG_QUIET_RFKILL(priv, "Failed to update QoS\n");
 130 }
 131
 132 static int iwlagn_update_beacon(struct iwl_priv *priv,
 133                                 struct ieee80211_vif *vif)
 134 {
 135         lockdep_assert_held(&priv->mutex);
 136
 137         dev_kfree_skb(priv->beacon_skb);
 138         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
 139         if (!priv->beacon_skb)
 140                 return -ENOMEM;
 141         return iwlagn_send_beacon_cmd(priv);
 142 }
 143
 144 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
 145                            struct iwl_rxon_context *ctx)
 146 {
 147         int ret = 0;
 148         struct iwl_rxon_assoc_cmd rxon_assoc;
 149         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
 150         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
 151
 152         if ((rxon1->flags == rxon2->flags) &&
 153             (rxon1->filter_flags == rxon2->filter_flags) &&
 154             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 155             (rxon1->ofdm_ht_single_stream_basic_rates ==
 156              rxon2->ofdm_ht_single_stream_basic_rates) &&
 157             (rxon1->ofdm_ht_dual_stream_basic_rates ==
 158              rxon2->ofdm_ht_dual_stream_basic_rates) &&
 159             (rxon1->ofdm_ht_triple_stream_basic_rates ==
 160              rxon2->ofdm_ht_triple_stream_basic_rates) &&
 161             (rxon1->acquisition_data == rxon2->acquisition_data) &&
 162             (rxon1->rx_chain == rxon2->rx_chain) &&
 163             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 164                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 165                 return 0;
 166         }
 167
 168         rxon_assoc.flags = ctx->staging.flags;
 169         rxon_assoc.filter_flags = ctx->staging.filter_flags;
 170         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
 171         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
 172         rxon_assoc.reserved1 = 0;
 173         rxon_assoc.reserved2 = 0;
 174         rxon_assoc.reserved3 = 0;
 175         rxon_assoc.ofdm_ht_single_stream_basic_rates =
 176             ctx->staging.ofdm_ht_single_stream_basic_rates;
 177         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 178             ctx->staging.ofdm_ht_dual_stream_basic_rates;
 179         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
 180         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 181                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
 182         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
 183
 184         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_assoc_cmd,
 185                                 CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
 186         return ret;
 187 }
 188
 189 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
 190                                struct iwl_rxon_context *ctx)
 191 {
 192         int ret;
 193         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 194
 195         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 196                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
 197         } else {
 198                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
 199                 if (ret)
 200                         return ret;
 201                 if (ctx->vif) {
 202                         ret = iwl_send_rxon_timing(priv, ctx);
 203                         if (ret) {
 204                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 205                                 return ret;
 206                         }
 207                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
 208                 }
 209         }
 210         if (ret)
 211                 return ret;
 212
 213         /*
 214          * Un-assoc RXON clears the station table and WEP
 215          * keys, so we have to restore those afterwards.
 216          */
 217         iwl_clear_ucode_stations(priv, ctx);
 218         /* update -- might need P2P now */
 219         iwl_update_bcast_station(priv, ctx);
 220         iwl_restore_stations(priv, ctx);
 221         ret = iwl_restore_default_wep_keys(priv, ctx);
 222         if (ret) {
 223                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 224                 return ret;
 225         }
 226
 227         memcpy(active, &ctx->staging, sizeof(*active));
 228         return 0;
 229 }
 230
 231 static int iwlagn_rxon_connect(struct iwl_priv *priv,
 232                                struct iwl_rxon_context *ctx)
 233 {
 234         int ret;
 235         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 236
 237         /* RXON timing must be before associated RXON */
 238         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 239                 ret = iwl_send_rxon_timing(priv, ctx);
 240                 if (ret) {
 241                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 242                         return ret;
 243                 }
 244         }
 245         /* QoS info may be cleared by previous un-assoc RXON */
 246         iwlagn_update_qos(priv, ctx);
 247
 248         /*
 249          * We'll run into this code path when beaconing is
 250          * enabled, but then we also need to send the beacon
 251          * to the device.
 252          */
 253         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 254                 ret = iwlagn_update_beacon(priv, ctx->vif);
 255                 if (ret) {
 256                         IWL_ERR(priv,
 257                                 "Error sending required beacon (%d)!\n",
 258                                 ret);
 259                         return ret;
 260                 }
 261         }
 262
 263         priv->start_calib = 0;
 264         /*
 265          * Apply the new configuration.
 266          *
 267          * Associated RXON doesn't clear the station table in uCode,
 268          * so we don't need to restore stations etc. after this.
 269          */
 270         ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, CMD_SYNC,
 271                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 272         if (ret) {
 273                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 274                 return ret;
 275         }
 276         memcpy(active, &ctx->staging, sizeof(*active));
 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             cfg(priv)->ht_params && cfg(priv)->ht_params->smps_mode)
 299                 ieee80211_request_smps(ctx->vif,
 300                                        cfg(priv)->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->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->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->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_dvm_send_cmd_pdu(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->mutex);
 423
 424         if (!iwl_is_alive(priv))
 425                 return -EBUSY;
 426
 427         /* This function hardcodes a bunch of dual-mode assumptions */
 428         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 429
 430         if (!ctx->is_active)
 431                 return 0;
 432
 433         /* always get timestamp with Rx frame */
 434         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 435
 436         /*
 437          * force CTS-to-self frames protection if RTS-CTS is not preferred
 438          * one aggregation protection method
 439          */
 440         if (!hw_params(priv).use_rts_for_aggregation)
 441                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 442
 443         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 444             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 445                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 446         else
 447                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 448
 449         iwl_print_rx_config_cmd(priv, ctx->ctxid);
 450         ret = iwl_check_rxon_cmd(priv, ctx);
 451         if (ret) {
 452                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 453                 return -EINVAL;
 454         }
 455
 456         /*
 457          * receive commit_rxon request
 458          * abort any previous channel switch if still in process
 459          */
 460         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
 461             (priv->switch_channel != ctx->staging.channel)) {
 462                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 463                               le16_to_cpu(priv->switch_channel));
 464                 iwl_chswitch_done(priv, false);
 465         }
 466
 467         /*
 468          * If we don't need to send a full RXON, we can use
 469          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 470          * and other flags for the current radio configuration.
 471          */
 472         if (!iwl_full_rxon_required(priv, ctx)) {
 473                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 474                 if (ret) {
 475                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 476                         return ret;
 477                 }
 478
 479                 memcpy(active, &ctx->staging, sizeof(*active));
 480                 /*
 481                  * We do not commit tx power settings while channel changing,
 482                  * do it now if after settings changed.
 483                  */
 484                 iwl_set_tx_power(priv, priv->tx_power_next, false);
 485
 486                 /* make sure we are in the right PS state */
 487                 iwl_power_update_mode(priv, true);
 488
 489                 return 0;
 490         }
 491
 492         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 493
 494         IWL_DEBUG_INFO(priv,
 495                        "Going to commit RXON\n"
 496                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 497                        "  * channel = %d\n"
 498                        "  * bssid = %pM\n",
 499                        (new_assoc ? "" : "out"),
 500                        le16_to_cpu(ctx->staging.channel),
 501                        ctx->staging.bssid_addr);
 502
 503         /*
 504          * Always clear associated first, but with the correct config.
 505          * This is required as for example station addition for the
 506          * AP station must be done after the BSSID is set to correctly
 507          * set up filters in the device.
 508          */
 509         ret = iwlagn_rxon_disconn(priv, ctx);
 510         if (ret)
 511                 return ret;
 512
 513         ret = iwlagn_set_pan_params(priv);
 514         if (ret)
 515                 return ret;
 516
 517         if (new_assoc)
 518                 return iwlagn_rxon_connect(priv, ctx);
 519
 520         return 0;
 521 }
 522
 523 void iwlagn_config_ht40(struct ieee80211_conf *conf,
 524         struct iwl_rxon_context *ctx)
 525 {
 526         if (conf_is_ht40_minus(conf)) {
 527                 ctx->ht.extension_chan_offset =
 528                         IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 529                 ctx->ht.is_40mhz = true;
 530         } else if (conf_is_ht40_plus(conf)) {
 531                 ctx->ht.extension_chan_offset =
 532                         IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 533                 ctx->ht.is_40mhz = true;
 534         } else {
 535                 ctx->ht.extension_chan_offset =
 536                         IEEE80211_HT_PARAM_CHA_SEC_NONE;
 537                 ctx->ht.is_40mhz = false;
 538         }
 539 }
 540
 541 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 542 {
 543         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 544         struct iwl_rxon_context *ctx;
 545         struct ieee80211_conf *conf = &hw->conf;
 546         struct ieee80211_channel *channel = conf->channel;
 547         const struct iwl_channel_info *ch_info;
 548         int ret = 0;
 549
 550         IWL_DEBUG_MAC80211(priv, "enter: changed %#x", changed);
 551
 552         mutex_lock(&priv->mutex);
 553
 554         if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
 555                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 556                 goto out;
 557         }
 558
 559         if (!iwl_is_ready(priv)) {
 560                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 561                 goto out;
 562         }
 563
 564         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 565                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 566                 /* mac80211 uses static for non-HT which is what we want */
 567                 priv->current_ht_config.smps = conf->smps_mode;
 568
 569                 /*
 570                  * Recalculate chain counts.
 571                  *
 572                  * If monitor mode is enabled then mac80211 will
 573                  * set up the SM PS mode to OFF if an HT channel is
 574                  * configured.
 575                  */
 576                 for_each_context(priv, ctx)
 577                         iwlagn_set_rxon_chain(priv, ctx);
 578         }
 579
 580         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 581                 ch_info = iwl_get_channel_info(priv, channel->band,
 582                                                channel->hw_value);
 583                 if (!is_channel_valid(ch_info)) {
 584                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 585                         ret = -EINVAL;
 586                         goto out;
 587                 }
 588
 589                 for_each_context(priv, ctx) {
 590                         /* Configure HT40 channels */
 591                         if (ctx->ht.enabled != conf_is_ht(conf))
 592                                 ctx->ht.enabled = conf_is_ht(conf);
 593
 594                         if (ctx->ht.enabled) {
 595                                 /* if HT40 is used, it should not change
 596                                  * after associated except channel switch */
 597                                 if (!ctx->ht.is_40mhz ||
 598                                                 !iwl_is_associated_ctx(ctx))
 599                                         iwlagn_config_ht40(conf, ctx);
 600                         } else
 601                                 ctx->ht.is_40mhz = false;
 602
 603                         /*
 604                          * Default to no protection. Protection mode will
 605                          * later be set from BSS config in iwl_ht_conf
 606                          */
 607                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 608
 609                         /* if we are switching from ht to 2.4 clear flags
 610                          * from any ht related info since 2.4 does not
 611                          * support ht */
 612                         if (le16_to_cpu(ctx->staging.channel) !=
 613                             channel->hw_value)
 614                                 ctx->staging.flags = 0;
 615
 616                         iwl_set_rxon_channel(priv, channel, ctx);
 617                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 618
 619                         iwl_set_flags_for_band(priv, ctx, channel->band,
 620                                                ctx->vif);
 621                 }
 622
 623                 iwl_update_bcast_stations(priv);
 624
 625                 /*
 626                  * The list of supported rates and rate mask can be different
 627                  * for each band; since the band may have changed, reset
 628                  * the rate mask to what mac80211 lists.
 629                  */
 630                 iwl_set_rate(priv);
 631         }
 632
 633         if (changed & (IEEE80211_CONF_CHANGE_PS |
 634                         IEEE80211_CONF_CHANGE_IDLE)) {
 635                 ret = iwl_power_update_mode(priv, false);
 636                 if (ret)
 637                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 638         }
 639
 640         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 641                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 642                         priv->tx_power_user_lmt, conf->power_level);
 643
 644                 iwl_set_tx_power(priv, conf->power_level, false);
 645         }
 646
 647         for_each_context(priv, ctx) {
 648                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 649                         continue;
 650                 iwlagn_commit_rxon(priv, ctx);
 651         }
 652  out:
 653         mutex_unlock(&priv->mutex);
 654         IWL_DEBUG_MAC80211(priv, "leave\n");
 655
 656         return ret;
 657 }
 658
 659 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 660                                        struct iwl_rxon_context *ctx,
 661                                        struct ieee80211_bss_conf *bss_conf)
 662 {
 663         struct ieee80211_vif *vif = ctx->vif;
 664         struct iwl_rxon_context *tmp;
 665         struct ieee80211_sta *sta;
 666         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 667         struct ieee80211_sta_ht_cap *ht_cap;
 668         bool need_multiple;
 669
 670         lockdep_assert_held(&priv->mutex);
 671
 672         switch (vif->type) {
 673         case NL80211_IFTYPE_STATION:
 674                 rcu_read_lock();
 675                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 676                 if (!sta) {
 677                         /*
 678                          * If at all, this can only happen through a race
 679                          * when the AP disconnects us while we're still
 680                          * setting up the connection, in that case mac80211
 681                          * will soon tell us about that.
 682                          */
 683                         need_multiple = false;
 684                         rcu_read_unlock();
 685                         break;
 686                 }
 687
 688                 ht_cap = &sta->ht_cap;
 689
 690                 need_multiple = true;
 691
 692                 /*
 693                  * If the peer advertises no support for receiving 2 and 3
 694                  * stream MCS rates, it can't be transmitting them either.
 695                  */
 696                 if (ht_cap->mcs.rx_mask[1] == 0 &&
 697                     ht_cap->mcs.rx_mask[2] == 0) {
 698                         need_multiple = false;
 699                 } else if (!(ht_cap->mcs.tx_params &
 700                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
 701                         /* If it can't TX MCS at all ... */
 702                         need_multiple = false;
 703                 } else if (ht_cap->mcs.tx_params &
 704                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
 705                         int maxstreams;
 706
 707                         /*
 708                          * But if it can receive them, it might still not
 709                          * be able to transmit them, which is what we need
 710                          * to check here -- so check the number of streams
 711                          * it advertises for TX (if different from RX).
 712                          */
 713
 714                         maxstreams = (ht_cap->mcs.tx_params &
 715                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
 716                         maxstreams >>=
 717                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 718                         maxstreams += 1;
 719
 720                         if (maxstreams <= 1)
 721                                 need_multiple = false;
 722                 }
 723
 724                 rcu_read_unlock();
 725                 break;
 726         case NL80211_IFTYPE_ADHOC:
 727                 /* currently */
 728                 need_multiple = false;
 729                 break;
 730         default:
 731                 /* only AP really */
 732                 need_multiple = true;
 733                 break;
 734         }
 735
 736         ctx->ht_need_multiple_chains = need_multiple;
 737
 738         if (!need_multiple) {
 739                 /* check all contexts */
 740                 for_each_context(priv, tmp) {
 741                         if (!tmp->vif)
 742                                 continue;
 743                         if (tmp->ht_need_multiple_chains) {
 744                                 need_multiple = true;
 745                                 break;
 746                         }
 747                 }
 748         }
 749
 750         ht_conf->single_chain_sufficient = !need_multiple;
 751 }
 752
 753 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 754 {
 755         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 756         int ret;
 757
 758         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
 759             iwl_is_any_associated(priv)) {
 760                 struct iwl_calib_chain_noise_reset_cmd cmd;
 761
 762                 /* clear data for chain noise calibration algorithm */
 763                 data->chain_noise_a = 0;
 764                 data->chain_noise_b = 0;
 765                 data->chain_noise_c = 0;
 766                 data->chain_signal_a = 0;
 767                 data->chain_signal_b = 0;
 768                 data->chain_signal_c = 0;
 769                 data->beacon_count = 0;
 770
 771                 memset(&cmd, 0, sizeof(cmd));
 772                 iwl_set_calib_hdr(&cmd.hdr,
 773                         priv->phy_calib_chain_noise_reset_cmd);
 774                 ret = iwl_dvm_send_cmd_pdu(priv,
 775                                         REPLY_PHY_CALIBRATION_CMD,
 776                                         CMD_SYNC, sizeof(cmd), &cmd);
 777                 if (ret)
 778                         IWL_ERR(priv,
 779                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 780                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 781                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 782         }
 783 }
 784
 785 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 786                              struct ieee80211_vif *vif,
 787                              struct ieee80211_bss_conf *bss_conf,
 788                              u32 changes)
 789 {
 790         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 791         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 792         int ret;
 793         bool force = false;
 794
 795         mutex_lock(&priv->mutex);
 796
 797         if (unlikely(!iwl_is_ready(priv))) {
 798                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 799                 mutex_unlock(&priv->mutex);
 800                 return;
 801         }
 802
 803         if (unlikely(!ctx->vif)) {
 804                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 805                 mutex_unlock(&priv->mutex);
 806                 return;
 807         }
 808
 809         if (changes & BSS_CHANGED_BEACON_INT)
 810                 force = true;
 811
 812         if (changes & BSS_CHANGED_QOS) {
 813                 ctx->qos_data.qos_active = bss_conf->qos;
 814                 iwlagn_update_qos(priv, ctx);
 815         }
 816
 817         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 818         if (vif->bss_conf.use_short_preamble)
 819                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 820         else
 821                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 822
 823         if (changes & BSS_CHANGED_ASSOC) {
 824                 if (bss_conf->assoc) {
 825                         priv->timestamp = bss_conf->last_tsf;
 826                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 827                 } else {
 828                         /*
 829                          * If we disassociate while there are pending
 830                          * frames, just wake up the queues and let the
 831                          * frames "escape" ... This shouldn't really
 832                          * be happening to start with, but we should
 833                          * not get stuck in this case either since it
 834                          * can happen if userspace gets confused.
 835                          */
 836                         iwlagn_lift_passive_no_rx(priv);
 837
 838                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 839
 840                         if (ctx->ctxid == IWL_RXON_CTX_BSS)
 841                                 priv->have_rekey_data = false;
 842                 }
 843
 844                 iwlagn_bt_coex_rssi_monitor(priv);
 845         }
 846
 847         if (ctx->ht.enabled) {
 848                 ctx->ht.protection = bss_conf->ht_operation_mode &
 849                                         IEEE80211_HT_OP_MODE_PROTECTION;
 850                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 851                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 852                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 853                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 854         }
 855
 856         iwlagn_set_rxon_chain(priv, ctx);
 857
 858         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 859                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 860         else
 861                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 862
 863         if (bss_conf->use_cts_prot)
 864                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 865         else
 866                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 867
 868         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 869
 870         if (vif->type == NL80211_IFTYPE_AP ||
 871             vif->type == NL80211_IFTYPE_ADHOC) {
 872                 if (vif->bss_conf.enable_beacon) {
 873                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 874                         priv->beacon_ctx = ctx;
 875                 } else {
 876                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 877                         priv->beacon_ctx = NULL;
 878                 }
 879         }
 880
 881         /*
 882          * If the ucode decides to do beacon filtering before
 883          * association, it will lose beacons that are needed
 884          * before sending frames out on passive channels. This
 885          * causes association failures on those channels. Enable
 886          * receiving beacons in such cases.
 887          */
 888
 889         if (vif->type == NL80211_IFTYPE_STATION) {
 890                 if (!bss_conf->assoc)
 891                         ctx->staging.filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
 892                 else
 893                         ctx->staging.filter_flags &=
 894                                                     ~RXON_FILTER_BCON_AWARE_MSK;
 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 }