drivers/net/wireless/iwlwifi/iwl-sta.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <net/mac80211.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/sched.h>
  33 #include <linux/lockdep.h>
  34
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-sta.h"
  38 #include "iwl-trans.h"
  39 #include "iwl-agn.h"
  40
  41 /* priv->sta_lock must be held */
  42 static void iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  43 {
  44
  45         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  46                 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u addr %pM\n",
  47                         sta_id, priv->stations[sta_id].sta.sta.addr);
  48
  49         if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  50                 IWL_DEBUG_ASSOC(priv,
  51                                 "STA id %u addr %pM already present in uCode (according to driver)\n",
  52                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  53         } else {
  54                 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
  55                 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
  56                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  57         }
  58 }
  59
  60 static int iwl_process_add_sta_resp(struct iwl_priv *priv,
  61                                     struct iwl_addsta_cmd *addsta,
  62                                     struct iwl_rx_packet *pkt,
  63                                     bool sync)
  64 {
  65         u8 sta_id = addsta->sta.sta_id;
  66         unsigned long flags;
  67         int ret = -EIO;
  68
  69         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  70                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  71                         pkt->hdr.flags);
  72                 return ret;
  73         }
  74
  75         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  76                        sta_id);
  77
  78         spin_lock_irqsave(&priv->sta_lock, flags);
  79
  80         switch (pkt->u.add_sta.status) {
  81         case ADD_STA_SUCCESS_MSK:
  82                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  83                 iwl_sta_ucode_activate(priv, sta_id);
  84                 ret = 0;
  85                 break;
  86         case ADD_STA_NO_ROOM_IN_TABLE:
  87                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  88                         sta_id);
  89                 break;
  90         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  91                 IWL_ERR(priv, "Adding station %d failed, no block ack resource.\n",
  92                         sta_id);
  93                 break;
  94         case ADD_STA_MODIFY_NON_EXIST_STA:
  95                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  96                         sta_id);
  97                 break;
  98         default:
  99                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
 100                                 pkt->u.add_sta.status);
 101                 break;
 102         }
 103
 104         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 105                        priv->stations[sta_id].sta.mode ==
 106                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 107                        sta_id, priv->stations[sta_id].sta.sta.addr);
 108
 109         /*
 110          * XXX: The MAC address in the command buffer is often changed from
 111          * the original sent to the device. That is, the MAC address
 112          * written to the command buffer often is not the same MAC address
 113          * read from the command buffer when the command returns. This
 114          * issue has not yet been resolved and this debugging is left to
 115          * observe the problem.
 116          */
 117         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 118                        priv->stations[sta_id].sta.mode ==
 119                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 120                        addsta->sta.addr);
 121         spin_unlock_irqrestore(&priv->sta_lock, flags);
 122
 123         return ret;
 124 }
 125
 126 static void iwl_add_sta_callback(struct iwl_priv *priv,
 127                                  struct iwl_device_cmd *cmd,
 128                                  struct iwl_rx_packet *pkt)
 129 {
 130         struct iwl_addsta_cmd *addsta =
 131                 (struct iwl_addsta_cmd *)cmd->cmd.payload;
 132
 133         iwl_process_add_sta_resp(priv, addsta, pkt, false);
 134
 135 }
 136
 137 static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 138 {
 139         u16 size = (u16)sizeof(struct iwl_addsta_cmd);
 140         struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
 141         memcpy(addsta, cmd, size);
 142         /* resrved in 5000 */
 143         addsta->rate_n_flags = cpu_to_le16(0);
 144         return size;
 145 }
 146
 147 int iwl_send_add_sta(struct iwl_priv *priv,
 148                      struct iwl_addsta_cmd *sta, u8 flags)
 149 {
 150         struct iwl_rx_packet *pkt = NULL;
 151         int ret = 0;
 152         u8 data[sizeof(*sta)];
 153         struct iwl_host_cmd cmd = {
 154                 .id = REPLY_ADD_STA,
 155                 .flags = flags,
 156                 .data = { data, },
 157         };
 158         u8 sta_id __maybe_unused = sta->sta.sta_id;
 159
 160         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 161                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 162
 163         if (flags & CMD_ASYNC)
 164                 cmd.callback = iwl_add_sta_callback;
 165         else {
 166                 cmd.flags |= CMD_WANT_SKB;
 167                 might_sleep();
 168         }
 169
 170         cmd.len[0] = iwlagn_build_addsta_hcmd(sta, data);
 171         ret = trans_send_cmd(&priv->trans, &cmd);
 172
 173         if (ret || (flags & CMD_ASYNC))
 174                 return ret;
 175
 176         if (ret == 0) {
 177                 pkt = (struct iwl_rx_packet *)cmd.reply_page;
 178                 ret = iwl_process_add_sta_resp(priv, sta, pkt, true);
 179         }
 180         iwl_free_pages(priv, cmd.reply_page);
 181
 182         return ret;
 183 }
 184
 185 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 186                                    struct ieee80211_sta *sta,
 187                                    struct iwl_rxon_context *ctx)
 188 {
 189         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 190         __le32 sta_flags;
 191         u8 mimo_ps_mode;
 192
 193         if (!sta || !sta_ht_inf->ht_supported)
 194                 goto done;
 195
 196         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 197         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 198                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 199                         "static" :
 200                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 201                         "dynamic" : "disabled");
 202
 203         sta_flags = priv->stations[index].sta.station_flags;
 204
 205         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 206
 207         switch (mimo_ps_mode) {
 208         case WLAN_HT_CAP_SM_PS_STATIC:
 209                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 210                 break;
 211         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 212                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 213                 break;
 214         case WLAN_HT_CAP_SM_PS_DISABLED:
 215                 break;
 216         default:
 217                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 218                 break;
 219         }
 220
 221         sta_flags |= cpu_to_le32(
 222               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 223
 224         sta_flags |= cpu_to_le32(
 225               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 226
 227         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
 228                 sta_flags |= STA_FLG_HT40_EN_MSK;
 229         else
 230                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 231
 232         priv->stations[index].sta.station_flags = sta_flags;
 233  done:
 234         return;
 235 }
 236
 237 /**
 238  * iwl_prep_station - Prepare station information for addition
 239  *
 240  * should be called with sta_lock held
 241  */
 242 u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 243                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 244 {
 245         struct iwl_station_entry *station;
 246         int i;
 247         u8 sta_id = IWL_INVALID_STATION;
 248
 249         if (is_ap)
 250                 sta_id = ctx->ap_sta_id;
 251         else if (is_broadcast_ether_addr(addr))
 252                 sta_id = ctx->bcast_sta_id;
 253         else
 254                 for (i = IWL_STA_ID;
 255                      i < hw_params(priv).max_stations; i++) {
 256                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 257                                                 addr)) {
 258                                 sta_id = i;
 259                                 break;
 260                         }
 261
 262                         if (!priv->stations[i].used &&
 263                             sta_id == IWL_INVALID_STATION)
 264                                 sta_id = i;
 265                 }
 266
 267         /*
 268          * These two conditions have the same outcome, but keep them
 269          * separate
 270          */
 271         if (unlikely(sta_id == IWL_INVALID_STATION))
 272                 return sta_id;
 273
 274         /*
 275          * uCode is not able to deal with multiple requests to add a
 276          * station. Keep track if one is in progress so that we do not send
 277          * another.
 278          */
 279         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 280                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 281                                 sta_id);
 282                 return sta_id;
 283         }
 284
 285         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 286             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 287             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 288                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 289                                 sta_id, addr);
 290                 return sta_id;
 291         }
 292
 293         station = &priv->stations[sta_id];
 294         station->used = IWL_STA_DRIVER_ACTIVE;
 295         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 296                         sta_id, addr);
 297         priv->num_stations++;
 298
 299         /* Set up the REPLY_ADD_STA command to send to device */
 300         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 301         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 302         station->sta.mode = 0;
 303         station->sta.sta.sta_id = sta_id;
 304         station->sta.station_flags = ctx->station_flags;
 305         station->ctxid = ctx->ctxid;
 306
 307         if (sta) {
 308                 struct iwl_station_priv_common *sta_priv;
 309
 310                 sta_priv = (void *)sta->drv_priv;
 311                 sta_priv->ctx = ctx;
 312         }
 313
 314         /*
 315          * OK to call unconditionally, since local stations (IBSS BSSID
 316          * STA and broadcast STA) pass in a NULL sta, and mac80211
 317          * doesn't allow HT IBSS.
 318          */
 319         iwl_set_ht_add_station(priv, sta_id, sta, ctx);
 320
 321         return sta_id;
 322
 323 }
 324
 325 #define STA_WAIT_TIMEOUT (HZ/2)
 326
 327 /**
 328  * iwl_add_station_common -
 329  */
 330 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 331                            const u8 *addr, bool is_ap,
 332                            struct ieee80211_sta *sta, u8 *sta_id_r)
 333 {
 334         unsigned long flags_spin;
 335         int ret = 0;
 336         u8 sta_id;
 337         struct iwl_addsta_cmd sta_cmd;
 338
 339         *sta_id_r = 0;
 340         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 341         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
 342         if (sta_id == IWL_INVALID_STATION) {
 343                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 344                         addr);
 345                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 346                 return -EINVAL;
 347         }
 348
 349         /*
 350          * uCode is not able to deal with multiple requests to add a
 351          * station. Keep track if one is in progress so that we do not send
 352          * another.
 353          */
 354         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 355                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 356                                sta_id);
 357                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 358                 return -EEXIST;
 359         }
 360
 361         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 362             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 363                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 364                                 sta_id, addr);
 365                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 366                 return -EEXIST;
 367         }
 368
 369         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 370         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 371         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 372
 373         /* Add station to device's station table */
 374         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 375         if (ret) {
 376                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 377                 IWL_ERR(priv, "Adding station %pM failed.\n",
 378                         priv->stations[sta_id].sta.sta.addr);
 379                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 380                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 381                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 382         }
 383         *sta_id_r = sta_id;
 384         return ret;
 385 }
 386
 387 /**
 388  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 389  *
 390  * priv->sta_lock must be held
 391  */
 392 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 393 {
 394         /* Ucode must be active and driver must be non active */
 395         if ((priv->stations[sta_id].used &
 396              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 397                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 398
 399         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 400
 401         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 402         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 403 }
 404
 405 static int iwl_send_remove_station(struct iwl_priv *priv,
 406                                    const u8 *addr, int sta_id,
 407                                    bool temporary)
 408 {
 409         struct iwl_rx_packet *pkt;
 410         int ret;
 411
 412         unsigned long flags_spin;
 413         struct iwl_rem_sta_cmd rm_sta_cmd;
 414
 415         struct iwl_host_cmd cmd = {
 416                 .id = REPLY_REMOVE_STA,
 417                 .len = { sizeof(struct iwl_rem_sta_cmd), },
 418                 .flags = CMD_SYNC,
 419                 .data = { &rm_sta_cmd, },
 420         };
 421
 422         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 423         rm_sta_cmd.num_sta = 1;
 424         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 425
 426         cmd.flags |= CMD_WANT_SKB;
 427
 428         ret = trans_send_cmd(&priv->trans, &cmd);
 429
 430         if (ret)
 431                 return ret;
 432
 433         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 434         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 435                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 436                           pkt->hdr.flags);
 437                 ret = -EIO;
 438         }
 439
 440         if (!ret) {
 441                 switch (pkt->u.rem_sta.status) {
 442                 case REM_STA_SUCCESS_MSK:
 443                         if (!temporary) {
 444                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 445                                 iwl_sta_ucode_deactivate(priv, sta_id);
 446                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 447                         }
 448                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 449                         break;
 450                 default:
 451                         ret = -EIO;
 452                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 453                         break;
 454                 }
 455         }
 456         iwl_free_pages(priv, cmd.reply_page);
 457
 458         return ret;
 459 }
 460
 461 /**
 462  * iwl_remove_station - Remove driver's knowledge of station.
 463  */
 464 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 465                        const u8 *addr)
 466 {
 467         unsigned long flags;
 468
 469         if (!iwl_is_ready(priv)) {
 470                 IWL_DEBUG_INFO(priv,
 471                         "Unable to remove station %pM, device not ready.\n",
 472                         addr);
 473                 /*
 474                  * It is typical for stations to be removed when we are
 475                  * going down. Return success since device will be down
 476                  * soon anyway
 477                  */
 478                 return 0;
 479         }
 480
 481         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 482                         sta_id, addr);
 483
 484         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 485                 return -EINVAL;
 486
 487         spin_lock_irqsave(&priv->sta_lock, flags);
 488
 489         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 490                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 491                                 addr);
 492                 goto out_err;
 493         }
 494
 495         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 496                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 497                                 addr);
 498                 goto out_err;
 499         }
 500
 501         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 502                 kfree(priv->stations[sta_id].lq);
 503                 priv->stations[sta_id].lq = NULL;
 504         }
 505
 506         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 507
 508         priv->num_stations--;
 509
 510         if (WARN_ON(priv->num_stations < 0))
 511                 priv->num_stations = 0;
 512
 513         spin_unlock_irqrestore(&priv->sta_lock, flags);
 514
 515         return iwl_send_remove_station(priv, addr, sta_id, false);
 516 out_err:
 517         spin_unlock_irqrestore(&priv->sta_lock, flags);
 518         return -EINVAL;
 519 }
 520
 521 /**
 522  * iwl_clear_ucode_stations - clear ucode station table bits
 523  *
 524  * This function clears all the bits in the driver indicating
 525  * which stations are active in the ucode. Call when something
 526  * other than explicit station management would cause this in
 527  * the ucode, e.g. unassociated RXON.
 528  */
 529 void iwl_clear_ucode_stations(struct iwl_priv *priv,
 530                               struct iwl_rxon_context *ctx)
 531 {
 532         int i;
 533         unsigned long flags_spin;
 534         bool cleared = false;
 535
 536         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 537
 538         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 539         for (i = 0; i < hw_params(priv).max_stations; i++) {
 540                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 541                         continue;
 542
 543                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 544                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 545                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 546                         cleared = true;
 547                 }
 548         }
 549         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 550
 551         if (!cleared)
 552                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 553 }
 554
 555 /**
 556  * iwl_restore_stations() - Restore driver known stations to device
 557  *
 558  * All stations considered active by driver, but not present in ucode, is
 559  * restored.
 560  *
 561  * Function sleeps.
 562  */
 563 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 564 {
 565         struct iwl_addsta_cmd sta_cmd;
 566         struct iwl_link_quality_cmd lq;
 567         unsigned long flags_spin;
 568         int i;
 569         bool found = false;
 570         int ret;
 571         bool send_lq;
 572
 573         if (!iwl_is_ready(priv)) {
 574                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 575                 return;
 576         }
 577
 578         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 579         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 580         for (i = 0; i < hw_params(priv).max_stations; i++) {
 581                 if (ctx->ctxid != priv->stations[i].ctxid)
 582                         continue;
 583                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 584                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 585                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 586                                         priv->stations[i].sta.sta.addr);
 587                         priv->stations[i].sta.mode = 0;
 588                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 589                         found = true;
 590                 }
 591         }
 592
 593         for (i = 0; i < hw_params(priv).max_stations; i++) {
 594                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 595                         memcpy(&sta_cmd, &priv->stations[i].sta,
 596                                sizeof(struct iwl_addsta_cmd));
 597                         send_lq = false;
 598                         if (priv->stations[i].lq) {
 599                                 memcpy(&lq, priv->stations[i].lq,
 600                                        sizeof(struct iwl_link_quality_cmd));
 601                                 send_lq = true;
 602                         }
 603                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 604                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 605                         if (ret) {
 606                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 607                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 608                                         priv->stations[i].sta.sta.addr);
 609                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 610                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 611                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 612                         }
 613                         /*
 614                          * Rate scaling has already been initialized, send
 615                          * current LQ command
 616                          */
 617                         if (send_lq)
 618                                 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 619                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 620                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 621                 }
 622         }
 623
 624         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 625         if (!found)
 626                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 627         else
 628                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 629 }
 630
 631 void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 632 {
 633         unsigned long flags;
 634         int sta_id = ctx->ap_sta_id;
 635         int ret;
 636         struct iwl_addsta_cmd sta_cmd;
 637         struct iwl_link_quality_cmd lq;
 638         bool active;
 639
 640         spin_lock_irqsave(&priv->sta_lock, flags);
 641         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 642                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 643                 return;
 644         }
 645
 646         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
 647         sta_cmd.mode = 0;
 648         memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
 649
 650         active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
 651         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 652         spin_unlock_irqrestore(&priv->sta_lock, flags);
 653
 654         if (active) {
 655                 ret = iwl_send_remove_station(
 656                         priv, priv->stations[sta_id].sta.sta.addr,
 657                         sta_id, true);
 658                 if (ret)
 659                         IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
 660                                 priv->stations[sta_id].sta.sta.addr, ret);
 661         }
 662         spin_lock_irqsave(&priv->sta_lock, flags);
 663         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
 664         spin_unlock_irqrestore(&priv->sta_lock, flags);
 665
 666         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 667         if (ret)
 668                 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
 669                         priv->stations[sta_id].sta.sta.addr, ret);
 670         iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 671 }
 672
 673 int iwl_get_free_ucode_key_offset(struct iwl_priv *priv)
 674 {
 675         int i;
 676
 677         for (i = 0; i < priv->sta_key_max_num; i++)
 678                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 679                         return i;
 680
 681         return WEP_INVALID_OFFSET;
 682 }
 683
 684 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
 685 {
 686         unsigned long flags;
 687         int i;
 688
 689         spin_lock_irqsave(&priv->sta_lock, flags);
 690         for (i = 0; i < hw_params(priv).max_stations; i++) {
 691                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 692                         continue;
 693
 694                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 695                 priv->num_stations--;
 696                 if (WARN_ON(priv->num_stations < 0))
 697                         priv->num_stations = 0;
 698                 kfree(priv->stations[i].lq);
 699                 priv->stations[i].lq = NULL;
 700         }
 701         spin_unlock_irqrestore(&priv->sta_lock, flags);
 702 }
 703
 704 #ifdef CONFIG_IWLWIFI_DEBUG
 705 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 706                            struct iwl_link_quality_cmd *lq)
 707 {
 708         int i;
 709         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 710         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 711                        lq->general_params.single_stream_ant_msk,
 712                        lq->general_params.dual_stream_ant_msk);
 713
 714         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 715                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 716                                i, lq->rs_table[i].rate_n_flags);
 717 }
 718 #else
 719 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 720                                    struct iwl_link_quality_cmd *lq)
 721 {
 722 }
 723 #endif
 724
 725 /**
 726  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
 727  *
 728  * It sometimes happens when a HT rate has been in use and we
 729  * loose connectivity with AP then mac80211 will first tell us that the
 730  * current channel is not HT anymore before removing the station. In such a
 731  * scenario the RXON flags will be updated to indicate we are not
 732  * communicating HT anymore, but the LQ command may still contain HT rates.
 733  * Test for this to prevent driver from sending LQ command between the time
 734  * RXON flags are updated and when LQ command is updated.
 735  */
 736 static bool is_lq_table_valid(struct iwl_priv *priv,
 737                               struct iwl_rxon_context *ctx,
 738                               struct iwl_link_quality_cmd *lq)
 739 {
 740         int i;
 741
 742         if (ctx->ht.enabled)
 743                 return true;
 744
 745         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 746                        ctx->active.channel);
 747         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 748                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
 749                         IWL_DEBUG_INFO(priv,
 750                                        "index %d of LQ expects HT channel\n",
 751                                        i);
 752                         return false;
 753                 }
 754         }
 755         return true;
 756 }
 757
 758 /**
 759  * iwl_send_lq_cmd() - Send link quality command
 760  * @init: This command is sent as part of station initialization right
 761  *        after station has been added.
 762  *
 763  * The link quality command is sent as the last step of station creation.
 764  * This is the special case in which init is set and we call a callback in
 765  * this case to clear the state indicating that station creation is in
 766  * progress.
 767  */
 768 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 769                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 770 {
 771         int ret = 0;
 772         unsigned long flags_spin;
 773
 774         struct iwl_host_cmd cmd = {
 775                 .id = REPLY_TX_LINK_QUALITY_CMD,
 776                 .len = { sizeof(struct iwl_link_quality_cmd), },
 777                 .flags = flags,
 778                 .data = { lq, },
 779         };
 780
 781         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 782                 return -EINVAL;
 783
 784
 785         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 786         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 787                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 788                 return -EINVAL;
 789         }
 790         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 791
 792         iwl_dump_lq_cmd(priv, lq);
 793         if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
 794                 return -EINVAL;
 795
 796         if (is_lq_table_valid(priv, ctx, lq))
 797                 ret = trans_send_cmd(&priv->trans, &cmd);
 798         else
 799                 ret = -EINVAL;
 800
 801         if (cmd.flags & CMD_ASYNC)
 802                 return ret;
 803
 804         if (init) {
 805                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
 806                                lq->sta_id);
 807                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 808                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 809                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 810         }
 811         return ret;
 812 }
 813
 814 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
 815                        struct ieee80211_vif *vif,
 816                        struct ieee80211_sta *sta)
 817 {
 818         struct iwl_priv *priv = hw->priv;
 819         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
 820         int ret;
 821
 822         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
 823                         sta->addr);
 824         mutex_lock(&priv->shrd->mutex);
 825         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 826                         sta->addr);
 827         ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
 828         if (ret)
 829                 IWL_ERR(priv, "Error removing station %pM\n",
 830                         sta->addr);
 831         mutex_unlock(&priv->shrd->mutex);
 832         return ret;
 833 }