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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2010 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
  39 /* priv->sta_lock must be held */
  40 static void iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  41 {
  42
  43         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  44                 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u addr %pM\n",
  45                         sta_id, priv->stations[sta_id].sta.sta.addr);
  46
  47         if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  48                 IWL_DEBUG_ASSOC(priv,
  49                                 "STA id %u addr %pM already present in uCode (according to driver)\n",
  50                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  51         } else {
  52                 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
  53                 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
  54                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  55         }
  56 }
  57
  58 static int iwl_process_add_sta_resp(struct iwl_priv *priv,
  59                                     struct iwl_addsta_cmd *addsta,
  60                                     struct iwl_rx_packet *pkt,
  61                                     bool sync)
  62 {
  63         u8 sta_id = addsta->sta.sta_id;
  64         unsigned long flags;
  65         int ret = -EIO;
  66
  67         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  68                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  69                         pkt->hdr.flags);
  70                 return ret;
  71         }
  72
  73         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  74                        sta_id);
  75
  76         spin_lock_irqsave(&priv->sta_lock, flags);
  77
  78         switch (pkt->u.add_sta.status) {
  79         case ADD_STA_SUCCESS_MSK:
  80                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  81                 iwl_sta_ucode_activate(priv, sta_id);
  82                 ret = 0;
  83                 break;
  84         case ADD_STA_NO_ROOM_IN_TABLE:
  85                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  86                         sta_id);
  87                 break;
  88         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  89                 IWL_ERR(priv, "Adding station %d failed, no block ack resource.\n",
  90                         sta_id);
  91                 break;
  92         case ADD_STA_MODIFY_NON_EXIST_STA:
  93                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  94                         sta_id);
  95                 break;
  96         default:
  97                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  98                                 pkt->u.add_sta.status);
  99                 break;
 100         }
 101
 102         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 103                        priv->stations[sta_id].sta.mode ==
 104                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 105                        sta_id, priv->stations[sta_id].sta.sta.addr);
 106
 107         /*
 108          * XXX: The MAC address in the command buffer is often changed from
 109          * the original sent to the device. That is, the MAC address
 110          * written to the command buffer often is not the same MAC address
 111          * read from the command buffer when the command returns. This
 112          * issue has not yet been resolved and this debugging is left to
 113          * observe the problem.
 114          */
 115         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 116                        priv->stations[sta_id].sta.mode ==
 117                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 118                        addsta->sta.addr);
 119         spin_unlock_irqrestore(&priv->sta_lock, flags);
 120
 121         return ret;
 122 }
 123
 124 static void iwl_add_sta_callback(struct iwl_priv *priv,
 125                                  struct iwl_device_cmd *cmd,
 126                                  struct iwl_rx_packet *pkt)
 127 {
 128         struct iwl_addsta_cmd *addsta =
 129                 (struct iwl_addsta_cmd *)cmd->cmd.payload;
 130
 131         iwl_process_add_sta_resp(priv, addsta, pkt, false);
 132
 133 }
 134
 135 int iwl_send_add_sta(struct iwl_priv *priv,
 136                      struct iwl_addsta_cmd *sta, u8 flags)
 137 {
 138         struct iwl_rx_packet *pkt = NULL;
 139         int ret = 0;
 140         u8 data[sizeof(*sta)];
 141         struct iwl_host_cmd cmd = {
 142                 .id = REPLY_ADD_STA,
 143                 .flags = flags,
 144                 .data = data,
 145         };
 146         u8 sta_id __maybe_unused = sta->sta.sta_id;
 147
 148         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 149                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 150
 151         if (flags & CMD_ASYNC)
 152                 cmd.callback = iwl_add_sta_callback;
 153         else {
 154                 cmd.flags |= CMD_WANT_SKB;
 155                 might_sleep();
 156         }
 157
 158         cmd.len = priv->cfg->ops->utils->build_addsta_hcmd(sta, data);
 159         ret = iwl_send_cmd(priv, &cmd);
 160
 161         if (ret || (flags & CMD_ASYNC))
 162                 return ret;
 163
 164         if (ret == 0) {
 165                 pkt = (struct iwl_rx_packet *)cmd.reply_page;
 166                 ret = iwl_process_add_sta_resp(priv, sta, pkt, true);
 167         }
 168         iwl_free_pages(priv, cmd.reply_page);
 169
 170         return ret;
 171 }
 172
 173 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 174                                    struct ieee80211_sta *sta,
 175                                    struct iwl_rxon_context *ctx)
 176 {
 177         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 178         __le32 sta_flags;
 179         u8 mimo_ps_mode;
 180
 181         if (!sta || !sta_ht_inf->ht_supported)
 182                 goto done;
 183
 184         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 185         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 186                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 187                         "static" :
 188                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 189                         "dynamic" : "disabled");
 190
 191         sta_flags = priv->stations[index].sta.station_flags;
 192
 193         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 194
 195         switch (mimo_ps_mode) {
 196         case WLAN_HT_CAP_SM_PS_STATIC:
 197                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 198                 break;
 199         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 200                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 201                 break;
 202         case WLAN_HT_CAP_SM_PS_DISABLED:
 203                 break;
 204         default:
 205                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 206                 break;
 207         }
 208
 209         sta_flags |= cpu_to_le32(
 210               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 211
 212         sta_flags |= cpu_to_le32(
 213               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 214
 215         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
 216                 sta_flags |= STA_FLG_HT40_EN_MSK;
 217         else
 218                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 219
 220         priv->stations[index].sta.station_flags = sta_flags;
 221  done:
 222         return;
 223 }
 224
 225 /**
 226  * iwl_prep_station - Prepare station information for addition
 227  *
 228  * should be called with sta_lock held
 229  */
 230 u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 231                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 232 {
 233         struct iwl_station_entry *station;
 234         int i;
 235         u8 sta_id = IWL_INVALID_STATION;
 236         u16 rate;
 237
 238         if (is_ap)
 239                 sta_id = ctx->ap_sta_id;
 240         else if (is_broadcast_ether_addr(addr))
 241                 sta_id = ctx->bcast_sta_id;
 242         else
 243                 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
 244                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 245                                                 addr)) {
 246                                 sta_id = i;
 247                                 break;
 248                         }
 249
 250                         if (!priv->stations[i].used &&
 251                             sta_id == IWL_INVALID_STATION)
 252                                 sta_id = i;
 253                 }
 254
 255         /*
 256          * These two conditions have the same outcome, but keep them
 257          * separate
 258          */
 259         if (unlikely(sta_id == IWL_INVALID_STATION))
 260                 return sta_id;
 261
 262         /*
 263          * uCode is not able to deal with multiple requests to add a
 264          * station. Keep track if one is in progress so that we do not send
 265          * another.
 266          */
 267         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 268                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 269                                 sta_id);
 270                 return sta_id;
 271         }
 272
 273         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 274             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 275             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 276                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 277                                 sta_id, addr);
 278                 return sta_id;
 279         }
 280
 281         station = &priv->stations[sta_id];
 282         station->used = IWL_STA_DRIVER_ACTIVE;
 283         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 284                         sta_id, addr);
 285         priv->num_stations++;
 286
 287         /* Set up the REPLY_ADD_STA command to send to device */
 288         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 289         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 290         station->sta.mode = 0;
 291         station->sta.sta.sta_id = sta_id;
 292         station->sta.station_flags = ctx->station_flags;
 293         station->ctxid = ctx->ctxid;
 294
 295         if (sta) {
 296                 struct iwl_station_priv_common *sta_priv;
 297
 298                 sta_priv = (void *)sta->drv_priv;
 299                 sta_priv->ctx = ctx;
 300         }
 301
 302         /*
 303          * OK to call unconditionally, since local stations (IBSS BSSID
 304          * STA and broadcast STA) pass in a NULL sta, and mac80211
 305          * doesn't allow HT IBSS.
 306          */
 307         iwl_set_ht_add_station(priv, sta_id, sta, ctx);
 308
 309         /* 3945 only */
 310         rate = (priv->band == IEEE80211_BAND_5GHZ) ?
 311                 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
 312         /* Turn on both antennas for the station... */
 313         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 314
 315         return sta_id;
 316
 317 }
 318
 319 #define STA_WAIT_TIMEOUT (HZ/2)
 320
 321 /**
 322  * iwl_add_station_common -
 323  */
 324 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 325                            const u8 *addr, bool is_ap,
 326                            struct ieee80211_sta *sta, u8 *sta_id_r)
 327 {
 328         unsigned long flags_spin;
 329         int ret = 0;
 330         u8 sta_id;
 331         struct iwl_addsta_cmd sta_cmd;
 332
 333         *sta_id_r = 0;
 334         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 335         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
 336         if (sta_id == IWL_INVALID_STATION) {
 337                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 338                         addr);
 339                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 340                 return -EINVAL;
 341         }
 342
 343         /*
 344          * uCode is not able to deal with multiple requests to add a
 345          * station. Keep track if one is in progress so that we do not send
 346          * another.
 347          */
 348         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 349                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 350                                sta_id);
 351                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 352                 return -EEXIST;
 353         }
 354
 355         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 356             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 357                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 358                                 sta_id, addr);
 359                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 360                 return -EEXIST;
 361         }
 362
 363         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 364         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 365         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 366
 367         /* Add station to device's station table */
 368         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 369         if (ret) {
 370                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 371                 IWL_ERR(priv, "Adding station %pM failed.\n",
 372                         priv->stations[sta_id].sta.sta.addr);
 373                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 374                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 375                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 376         }
 377         *sta_id_r = sta_id;
 378         return ret;
 379 }
 380
 381 /**
 382  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 383  *
 384  * priv->sta_lock must be held
 385  */
 386 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 387 {
 388         /* Ucode must be active and driver must be non active */
 389         if ((priv->stations[sta_id].used &
 390              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 391                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 392
 393         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 394
 395         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 396         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 397 }
 398
 399 static int iwl_send_remove_station(struct iwl_priv *priv,
 400                                    const u8 *addr, int sta_id,
 401                                    bool temporary)
 402 {
 403         struct iwl_rx_packet *pkt;
 404         int ret;
 405
 406         unsigned long flags_spin;
 407         struct iwl_rem_sta_cmd rm_sta_cmd;
 408
 409         struct iwl_host_cmd cmd = {
 410                 .id = REPLY_REMOVE_STA,
 411                 .len = sizeof(struct iwl_rem_sta_cmd),
 412                 .flags = CMD_SYNC,
 413                 .data = &rm_sta_cmd,
 414         };
 415
 416         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 417         rm_sta_cmd.num_sta = 1;
 418         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 419
 420         cmd.flags |= CMD_WANT_SKB;
 421
 422         ret = iwl_send_cmd(priv, &cmd);
 423
 424         if (ret)
 425                 return ret;
 426
 427         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 428         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 429                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 430                           pkt->hdr.flags);
 431                 ret = -EIO;
 432         }
 433
 434         if (!ret) {
 435                 switch (pkt->u.rem_sta.status) {
 436                 case REM_STA_SUCCESS_MSK:
 437                         if (!temporary) {
 438                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 439                                 iwl_sta_ucode_deactivate(priv, sta_id);
 440                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 441                         }
 442                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 443                         break;
 444                 default:
 445                         ret = -EIO;
 446                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 447                         break;
 448                 }
 449         }
 450         iwl_free_pages(priv, cmd.reply_page);
 451
 452         return ret;
 453 }
 454
 455 /**
 456  * iwl_remove_station - Remove driver's knowledge of station.
 457  */
 458 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 459                        const u8 *addr)
 460 {
 461         unsigned long flags;
 462
 463         if (!iwl_is_ready(priv)) {
 464                 IWL_DEBUG_INFO(priv,
 465                         "Unable to remove station %pM, device not ready.\n",
 466                         addr);
 467                 /*
 468                  * It is typical for stations to be removed when we are
 469                  * going down. Return success since device will be down
 470                  * soon anyway
 471                  */
 472                 return 0;
 473         }
 474
 475         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 476                         sta_id, addr);
 477
 478         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 479                 return -EINVAL;
 480
 481         spin_lock_irqsave(&priv->sta_lock, flags);
 482
 483         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 484                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 485                                 addr);
 486                 goto out_err;
 487         }
 488
 489         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 490                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 491                                 addr);
 492                 goto out_err;
 493         }
 494
 495         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 496                 kfree(priv->stations[sta_id].lq);
 497                 priv->stations[sta_id].lq = NULL;
 498         }
 499
 500         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 501
 502         priv->num_stations--;
 503
 504         BUG_ON(priv->num_stations < 0);
 505
 506         spin_unlock_irqrestore(&priv->sta_lock, flags);
 507
 508         return iwl_send_remove_station(priv, addr, sta_id, false);
 509 out_err:
 510         spin_unlock_irqrestore(&priv->sta_lock, flags);
 511         return -EINVAL;
 512 }
 513
 514 /**
 515  * iwl_clear_ucode_stations - clear ucode station table bits
 516  *
 517  * This function clears all the bits in the driver indicating
 518  * which stations are active in the ucode. Call when something
 519  * other than explicit station management would cause this in
 520  * the ucode, e.g. unassociated RXON.
 521  */
 522 void iwl_clear_ucode_stations(struct iwl_priv *priv,
 523                               struct iwl_rxon_context *ctx)
 524 {
 525         int i;
 526         unsigned long flags_spin;
 527         bool cleared = false;
 528
 529         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 530
 531         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 532         for (i = 0; i < priv->hw_params.max_stations; i++) {
 533                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 534                         continue;
 535
 536                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 537                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 538                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 539                         cleared = true;
 540                 }
 541         }
 542         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 543
 544         if (!cleared)
 545                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 546 }
 547
 548 /**
 549  * iwl_restore_stations() - Restore driver known stations to device
 550  *
 551  * All stations considered active by driver, but not present in ucode, is
 552  * restored.
 553  *
 554  * Function sleeps.
 555  */
 556 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 557 {
 558         struct iwl_addsta_cmd sta_cmd;
 559         struct iwl_link_quality_cmd lq;
 560         unsigned long flags_spin;
 561         int i;
 562         bool found = false;
 563         int ret;
 564         bool send_lq;
 565
 566         if (!iwl_is_ready(priv)) {
 567                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 568                 return;
 569         }
 570
 571         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 572         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 573         for (i = 0; i < priv->hw_params.max_stations; i++) {
 574                 if (ctx->ctxid != priv->stations[i].ctxid)
 575                         continue;
 576                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 577                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 578                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 579                                         priv->stations[i].sta.sta.addr);
 580                         priv->stations[i].sta.mode = 0;
 581                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 582                         found = true;
 583                 }
 584         }
 585
 586         for (i = 0; i < priv->hw_params.max_stations; i++) {
 587                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 588                         memcpy(&sta_cmd, &priv->stations[i].sta,
 589                                sizeof(struct iwl_addsta_cmd));
 590                         send_lq = false;
 591                         if (priv->stations[i].lq) {
 592                                 memcpy(&lq, priv->stations[i].lq,
 593                                        sizeof(struct iwl_link_quality_cmd));
 594                                 send_lq = true;
 595                         }
 596                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 597                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 598                         if (ret) {
 599                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 600                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 601                                         priv->stations[i].sta.sta.addr);
 602                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 603                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 604                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 605                         }
 606                         /*
 607                          * Rate scaling has already been initialized, send
 608                          * current LQ command
 609                          */
 610                         if (send_lq)
 611                                 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 612                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 613                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 614                 }
 615         }
 616
 617         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 618         if (!found)
 619                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 620         else
 621                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 622 }
 623
 624 void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 625 {
 626         unsigned long flags;
 627         int sta_id = ctx->ap_sta_id;
 628         int ret;
 629         struct iwl_addsta_cmd sta_cmd;
 630         struct iwl_link_quality_cmd lq;
 631         bool active;
 632
 633         spin_lock_irqsave(&priv->sta_lock, flags);
 634         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 635                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 636                 return;
 637         }
 638
 639         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
 640         sta_cmd.mode = 0;
 641         memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
 642
 643         active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
 644         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 645         spin_unlock_irqrestore(&priv->sta_lock, flags);
 646
 647         if (active) {
 648                 ret = iwl_send_remove_station(
 649                         priv, priv->stations[sta_id].sta.sta.addr,
 650                         sta_id, true);
 651                 if (ret)
 652                         IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
 653                                 priv->stations[sta_id].sta.sta.addr, ret);
 654         }
 655         spin_lock_irqsave(&priv->sta_lock, flags);
 656         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
 657         spin_unlock_irqrestore(&priv->sta_lock, flags);
 658
 659         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 660         if (ret)
 661                 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
 662                         priv->stations[sta_id].sta.sta.addr, ret);
 663         iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 664 }
 665
 666 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
 667 {
 668         int i;
 669
 670         for (i = 0; i < priv->sta_key_max_num; i++)
 671                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 672                         return i;
 673
 674         return WEP_INVALID_OFFSET;
 675 }
 676
 677 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
 678 {
 679         unsigned long flags;
 680         int i;
 681
 682         spin_lock_irqsave(&priv->sta_lock, flags);
 683         for (i = 0; i < priv->hw_params.max_stations; i++) {
 684                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 685                         continue;
 686
 687                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 688                 priv->num_stations--;
 689                 BUG_ON(priv->num_stations < 0);
 690                 kfree(priv->stations[i].lq);
 691                 priv->stations[i].lq = NULL;
 692         }
 693         spin_unlock_irqrestore(&priv->sta_lock, flags);
 694 }
 695
 696 #ifdef CONFIG_IWLWIFI_DEBUG
 697 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 698                            struct iwl_link_quality_cmd *lq)
 699 {
 700         int i;
 701         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 702         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 703                        lq->general_params.single_stream_ant_msk,
 704                        lq->general_params.dual_stream_ant_msk);
 705
 706         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 707                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 708                                i, lq->rs_table[i].rate_n_flags);
 709 }
 710 #else
 711 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 712                                    struct iwl_link_quality_cmd *lq)
 713 {
 714 }
 715 #endif
 716
 717 /**
 718  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
 719  *
 720  * It sometimes happens when a HT rate has been in use and we
 721  * loose connectivity with AP then mac80211 will first tell us that the
 722  * current channel is not HT anymore before removing the station. In such a
 723  * scenario the RXON flags will be updated to indicate we are not
 724  * communicating HT anymore, but the LQ command may still contain HT rates.
 725  * Test for this to prevent driver from sending LQ command between the time
 726  * RXON flags are updated and when LQ command is updated.
 727  */
 728 static bool is_lq_table_valid(struct iwl_priv *priv,
 729                               struct iwl_rxon_context *ctx,
 730                               struct iwl_link_quality_cmd *lq)
 731 {
 732         int i;
 733
 734         if (ctx->ht.enabled)
 735                 return true;
 736
 737         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 738                        ctx->active.channel);
 739         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 740                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
 741                         IWL_DEBUG_INFO(priv,
 742                                        "index %d of LQ expects HT channel\n",
 743                                        i);
 744                         return false;
 745                 }
 746         }
 747         return true;
 748 }
 749
 750 /**
 751  * iwl_send_lq_cmd() - Send link quality command
 752  * @init: This command is sent as part of station initialization right
 753  *        after station has been added.
 754  *
 755  * The link quality command is sent as the last step of station creation.
 756  * This is the special case in which init is set and we call a callback in
 757  * this case to clear the state indicating that station creation is in
 758  * progress.
 759  */
 760 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 761                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 762 {
 763         int ret = 0;
 764         unsigned long flags_spin;
 765
 766         struct iwl_host_cmd cmd = {
 767                 .id = REPLY_TX_LINK_QUALITY_CMD,
 768                 .len = sizeof(struct iwl_link_quality_cmd),
 769                 .flags = flags,
 770                 .data = lq,
 771         };
 772
 773         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 774                 return -EINVAL;
 775
 776
 777         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 778         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 779                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 780                 return -EINVAL;
 781         }
 782         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 783
 784         iwl_dump_lq_cmd(priv, lq);
 785         BUG_ON(init && (cmd.flags & CMD_ASYNC));
 786
 787         if (is_lq_table_valid(priv, ctx, lq))
 788                 ret = iwl_send_cmd(priv, &cmd);
 789         else
 790                 ret = -EINVAL;
 791
 792         if (cmd.flags & CMD_ASYNC)
 793                 return ret;
 794
 795         if (init) {
 796                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
 797                                lq->sta_id);
 798                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 799                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 800                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 801         }
 802         return ret;
 803 }
 804
 805 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
 806                        struct ieee80211_vif *vif,
 807                        struct ieee80211_sta *sta)
 808 {
 809         struct iwl_priv *priv = hw->priv;
 810         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
 811         int ret;
 812
 813         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
 814                         sta->addr);
 815         mutex_lock(&priv->mutex);
 816         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 817                         sta->addr);
 818         ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
 819         if (ret)
 820                 IWL_ERR(priv, "Error removing station %pM\n",
 821                         sta->addr);
 822         mutex_unlock(&priv->mutex);
 823         return ret;
 824 }