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
  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[0] = 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
 237         if (is_ap)
 238                 sta_id = ctx->ap_sta_id;
 239         else if (is_broadcast_ether_addr(addr))
 240                 sta_id = ctx->bcast_sta_id;
 241         else
 242                 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
 243                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 244                                                 addr)) {
 245                                 sta_id = i;
 246                                 break;
 247                         }
 248
 249                         if (!priv->stations[i].used &&
 250                             sta_id == IWL_INVALID_STATION)
 251                                 sta_id = i;
 252                 }
 253
 254         /*
 255          * These two conditions have the same outcome, but keep them
 256          * separate
 257          */
 258         if (unlikely(sta_id == IWL_INVALID_STATION))
 259                 return sta_id;
 260
 261         /*
 262          * uCode is not able to deal with multiple requests to add a
 263          * station. Keep track if one is in progress so that we do not send
 264          * another.
 265          */
 266         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 267                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 268                                 sta_id);
 269                 return sta_id;
 270         }
 271
 272         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 273             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 274             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 275                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 276                                 sta_id, addr);
 277                 return sta_id;
 278         }
 279
 280         station = &priv->stations[sta_id];
 281         station->used = IWL_STA_DRIVER_ACTIVE;
 282         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 283                         sta_id, addr);
 284         priv->num_stations++;
 285
 286         /* Set up the REPLY_ADD_STA command to send to device */
 287         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 288         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 289         station->sta.mode = 0;
 290         station->sta.sta.sta_id = sta_id;
 291         station->sta.station_flags = ctx->station_flags;
 292         station->ctxid = ctx->ctxid;
 293
 294         if (sta) {
 295                 struct iwl_station_priv_common *sta_priv;
 296
 297                 sta_priv = (void *)sta->drv_priv;
 298                 sta_priv->ctx = ctx;
 299         }
 300
 301         /*
 302          * OK to call unconditionally, since local stations (IBSS BSSID
 303          * STA and broadcast STA) pass in a NULL sta, and mac80211
 304          * doesn't allow HT IBSS.
 305          */
 306         iwl_set_ht_add_station(priv, sta_id, sta, ctx);
 307
 308         return sta_id;
 309
 310 }
 311
 312 #define STA_WAIT_TIMEOUT (HZ/2)
 313
 314 /**
 315  * iwl_add_station_common -
 316  */
 317 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 318                            const u8 *addr, bool is_ap,
 319                            struct ieee80211_sta *sta, u8 *sta_id_r)
 320 {
 321         unsigned long flags_spin;
 322         int ret = 0;
 323         u8 sta_id;
 324         struct iwl_addsta_cmd sta_cmd;
 325
 326         *sta_id_r = 0;
 327         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 328         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
 329         if (sta_id == IWL_INVALID_STATION) {
 330                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 331                         addr);
 332                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 333                 return -EINVAL;
 334         }
 335
 336         /*
 337          * uCode is not able to deal with multiple requests to add a
 338          * station. Keep track if one is in progress so that we do not send
 339          * another.
 340          */
 341         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 342                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 343                                sta_id);
 344                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 345                 return -EEXIST;
 346         }
 347
 348         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 349             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 350                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 351                                 sta_id, addr);
 352                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 353                 return -EEXIST;
 354         }
 355
 356         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 357         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 358         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 359
 360         /* Add station to device's station table */
 361         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 362         if (ret) {
 363                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 364                 IWL_ERR(priv, "Adding station %pM failed.\n",
 365                         priv->stations[sta_id].sta.sta.addr);
 366                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 367                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 368                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 369         }
 370         *sta_id_r = sta_id;
 371         return ret;
 372 }
 373
 374 /**
 375  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 376  *
 377  * priv->sta_lock must be held
 378  */
 379 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 380 {
 381         /* Ucode must be active and driver must be non active */
 382         if ((priv->stations[sta_id].used &
 383              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 384                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 385
 386         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 387
 388         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 389         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 390 }
 391
 392 static int iwl_send_remove_station(struct iwl_priv *priv,
 393                                    const u8 *addr, int sta_id,
 394                                    bool temporary)
 395 {
 396         struct iwl_rx_packet *pkt;
 397         int ret;
 398
 399         unsigned long flags_spin;
 400         struct iwl_rem_sta_cmd rm_sta_cmd;
 401
 402         struct iwl_host_cmd cmd = {
 403                 .id = REPLY_REMOVE_STA,
 404                 .len = { sizeof(struct iwl_rem_sta_cmd), },
 405                 .flags = CMD_SYNC,
 406                 .data = { &rm_sta_cmd, },
 407         };
 408
 409         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 410         rm_sta_cmd.num_sta = 1;
 411         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 412
 413         cmd.flags |= CMD_WANT_SKB;
 414
 415         ret = iwl_send_cmd(priv, &cmd);
 416
 417         if (ret)
 418                 return ret;
 419
 420         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 421         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 422                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 423                           pkt->hdr.flags);
 424                 ret = -EIO;
 425         }
 426
 427         if (!ret) {
 428                 switch (pkt->u.rem_sta.status) {
 429                 case REM_STA_SUCCESS_MSK:
 430                         if (!temporary) {
 431                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 432                                 iwl_sta_ucode_deactivate(priv, sta_id);
 433                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 434                         }
 435                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 436                         break;
 437                 default:
 438                         ret = -EIO;
 439                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 440                         break;
 441                 }
 442         }
 443         iwl_free_pages(priv, cmd.reply_page);
 444
 445         return ret;
 446 }
 447
 448 /**
 449  * iwl_remove_station - Remove driver's knowledge of station.
 450  */
 451 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 452                        const u8 *addr)
 453 {
 454         unsigned long flags;
 455
 456         if (!iwl_is_ready(priv)) {
 457                 IWL_DEBUG_INFO(priv,
 458                         "Unable to remove station %pM, device not ready.\n",
 459                         addr);
 460                 /*
 461                  * It is typical for stations to be removed when we are
 462                  * going down. Return success since device will be down
 463                  * soon anyway
 464                  */
 465                 return 0;
 466         }
 467
 468         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 469                         sta_id, addr);
 470
 471         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 472                 return -EINVAL;
 473
 474         spin_lock_irqsave(&priv->sta_lock, flags);
 475
 476         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 477                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 478                                 addr);
 479                 goto out_err;
 480         }
 481
 482         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 483                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 484                                 addr);
 485                 goto out_err;
 486         }
 487
 488         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 489                 kfree(priv->stations[sta_id].lq);
 490                 priv->stations[sta_id].lq = NULL;
 491         }
 492
 493         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 494
 495         priv->num_stations--;
 496
 497         if (WARN_ON(priv->num_stations < 0))
 498                 priv->num_stations = 0;
 499
 500         spin_unlock_irqrestore(&priv->sta_lock, flags);
 501
 502         return iwl_send_remove_station(priv, addr, sta_id, false);
 503 out_err:
 504         spin_unlock_irqrestore(&priv->sta_lock, flags);
 505         return -EINVAL;
 506 }
 507
 508 /**
 509  * iwl_clear_ucode_stations - clear ucode station table bits
 510  *
 511  * This function clears all the bits in the driver indicating
 512  * which stations are active in the ucode. Call when something
 513  * other than explicit station management would cause this in
 514  * the ucode, e.g. unassociated RXON.
 515  */
 516 void iwl_clear_ucode_stations(struct iwl_priv *priv,
 517                               struct iwl_rxon_context *ctx)
 518 {
 519         int i;
 520         unsigned long flags_spin;
 521         bool cleared = false;
 522
 523         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 524
 525         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 526         for (i = 0; i < priv->hw_params.max_stations; i++) {
 527                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 528                         continue;
 529
 530                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 531                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 532                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 533                         cleared = true;
 534                 }
 535         }
 536         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 537
 538         if (!cleared)
 539                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 540 }
 541
 542 /**
 543  * iwl_restore_stations() - Restore driver known stations to device
 544  *
 545  * All stations considered active by driver, but not present in ucode, is
 546  * restored.
 547  *
 548  * Function sleeps.
 549  */
 550 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 551 {
 552         struct iwl_addsta_cmd sta_cmd;
 553         struct iwl_link_quality_cmd lq;
 554         unsigned long flags_spin;
 555         int i;
 556         bool found = false;
 557         int ret;
 558         bool send_lq;
 559
 560         if (!iwl_is_ready(priv)) {
 561                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 562                 return;
 563         }
 564
 565         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 566         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 567         for (i = 0; i < priv->hw_params.max_stations; i++) {
 568                 if (ctx->ctxid != priv->stations[i].ctxid)
 569                         continue;
 570                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 571                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 572                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 573                                         priv->stations[i].sta.sta.addr);
 574                         priv->stations[i].sta.mode = 0;
 575                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 576                         found = true;
 577                 }
 578         }
 579
 580         for (i = 0; i < priv->hw_params.max_stations; i++) {
 581                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 582                         memcpy(&sta_cmd, &priv->stations[i].sta,
 583                                sizeof(struct iwl_addsta_cmd));
 584                         send_lq = false;
 585                         if (priv->stations[i].lq) {
 586                                 memcpy(&lq, priv->stations[i].lq,
 587                                        sizeof(struct iwl_link_quality_cmd));
 588                                 send_lq = true;
 589                         }
 590                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 591                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 592                         if (ret) {
 593                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 594                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 595                                         priv->stations[i].sta.sta.addr);
 596                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 597                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 598                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 599                         }
 600                         /*
 601                          * Rate scaling has already been initialized, send
 602                          * current LQ command
 603                          */
 604                         if (send_lq)
 605                                 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 606                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 607                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 608                 }
 609         }
 610
 611         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 612         if (!found)
 613                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 614         else
 615                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 616 }
 617
 618 void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 619 {
 620         unsigned long flags;
 621         int sta_id = ctx->ap_sta_id;
 622         int ret;
 623         struct iwl_addsta_cmd sta_cmd;
 624         struct iwl_link_quality_cmd lq;
 625         bool active;
 626
 627         spin_lock_irqsave(&priv->sta_lock, flags);
 628         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 629                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 630                 return;
 631         }
 632
 633         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
 634         sta_cmd.mode = 0;
 635         memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
 636
 637         active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
 638         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 639         spin_unlock_irqrestore(&priv->sta_lock, flags);
 640
 641         if (active) {
 642                 ret = iwl_send_remove_station(
 643                         priv, priv->stations[sta_id].sta.sta.addr,
 644                         sta_id, true);
 645                 if (ret)
 646                         IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
 647                                 priv->stations[sta_id].sta.sta.addr, ret);
 648         }
 649         spin_lock_irqsave(&priv->sta_lock, flags);
 650         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
 651         spin_unlock_irqrestore(&priv->sta_lock, flags);
 652
 653         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 654         if (ret)
 655                 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
 656                         priv->stations[sta_id].sta.sta.addr, ret);
 657         iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 658 }
 659
 660 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
 661 {
 662         int i;
 663
 664         for (i = 0; i < priv->sta_key_max_num; i++)
 665                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 666                         return i;
 667
 668         return WEP_INVALID_OFFSET;
 669 }
 670
 671 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
 672 {
 673         unsigned long flags;
 674         int i;
 675
 676         spin_lock_irqsave(&priv->sta_lock, flags);
 677         for (i = 0; i < priv->hw_params.max_stations; i++) {
 678                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 679                         continue;
 680
 681                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 682                 priv->num_stations--;
 683                 if (WARN_ON(priv->num_stations < 0))
 684                         priv->num_stations = 0;
 685                 kfree(priv->stations[i].lq);
 686                 priv->stations[i].lq = NULL;
 687         }
 688         spin_unlock_irqrestore(&priv->sta_lock, flags);
 689 }
 690
 691 #ifdef CONFIG_IWLWIFI_DEBUG
 692 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 693                            struct iwl_link_quality_cmd *lq)
 694 {
 695         int i;
 696         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 697         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 698                        lq->general_params.single_stream_ant_msk,
 699                        lq->general_params.dual_stream_ant_msk);
 700
 701         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 702                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 703                                i, lq->rs_table[i].rate_n_flags);
 704 }
 705 #else
 706 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 707                                    struct iwl_link_quality_cmd *lq)
 708 {
 709 }
 710 #endif
 711
 712 /**
 713  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
 714  *
 715  * It sometimes happens when a HT rate has been in use and we
 716  * loose connectivity with AP then mac80211 will first tell us that the
 717  * current channel is not HT anymore before removing the station. In such a
 718  * scenario the RXON flags will be updated to indicate we are not
 719  * communicating HT anymore, but the LQ command may still contain HT rates.
 720  * Test for this to prevent driver from sending LQ command between the time
 721  * RXON flags are updated and when LQ command is updated.
 722  */
 723 static bool is_lq_table_valid(struct iwl_priv *priv,
 724                               struct iwl_rxon_context *ctx,
 725                               struct iwl_link_quality_cmd *lq)
 726 {
 727         int i;
 728
 729         if (ctx->ht.enabled)
 730                 return true;
 731
 732         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 733                        ctx->active.channel);
 734         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 735                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
 736                         IWL_DEBUG_INFO(priv,
 737                                        "index %d of LQ expects HT channel\n",
 738                                        i);
 739                         return false;
 740                 }
 741         }
 742         return true;
 743 }
 744
 745 /**
 746  * iwl_send_lq_cmd() - Send link quality command
 747  * @init: This command is sent as part of station initialization right
 748  *        after station has been added.
 749  *
 750  * The link quality command is sent as the last step of station creation.
 751  * This is the special case in which init is set and we call a callback in
 752  * this case to clear the state indicating that station creation is in
 753  * progress.
 754  */
 755 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 756                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 757 {
 758         int ret = 0;
 759         unsigned long flags_spin;
 760
 761         struct iwl_host_cmd cmd = {
 762                 .id = REPLY_TX_LINK_QUALITY_CMD,
 763                 .len = { sizeof(struct iwl_link_quality_cmd), },
 764                 .flags = flags,
 765                 .data = { lq, },
 766         };
 767
 768         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 769                 return -EINVAL;
 770
 771
 772         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 773         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 774                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 775                 return -EINVAL;
 776         }
 777         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 778
 779         iwl_dump_lq_cmd(priv, lq);
 780         if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
 781                 return -EINVAL;
 782
 783         if (is_lq_table_valid(priv, ctx, lq))
 784                 ret = iwl_send_cmd(priv, &cmd);
 785         else
 786                 ret = -EINVAL;
 787
 788         if (cmd.flags & CMD_ASYNC)
 789                 return ret;
 790
 791         if (init) {
 792                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
 793                                lq->sta_id);
 794                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 795                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 796                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 797         }
 798         return ret;
 799 }
 800
 801 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
 802                        struct ieee80211_vif *vif,
 803                        struct ieee80211_sta *sta)
 804 {
 805         struct iwl_priv *priv = hw->priv;
 806         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
 807         int ret;
 808
 809         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
 810                         sta->addr);
 811         mutex_lock(&priv->mutex);
 812         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 813                         sta->addr);
 814         ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
 815         if (ret)
 816                 IWL_ERR(priv, "Error removing station %pM\n",
 817                         sta->addr);
 818         mutex_unlock(&priv->mutex);
 819         return ret;
 820 }