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->shrd->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 {
  64         u8 sta_id = addsta->sta.sta_id;
  65         unsigned long flags;
  66         int ret = -EIO;
  67
  68         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  69                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  70                         pkt->hdr.flags);
  71                 return ret;
  72         }
  73
  74         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  75                        sta_id);
  76
  77         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
  78
  79         switch (pkt->u.add_sta.status) {
  80         case ADD_STA_SUCCESS_MSK:
  81                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  82                 iwl_sta_ucode_activate(priv, sta_id);
  83                 ret = 0;
  84                 break;
  85         case ADD_STA_NO_ROOM_IN_TABLE:
  86                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  87                         sta_id);
  88                 break;
  89         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  90                 IWL_ERR(priv, "Adding station %d failed, no block ack resource.\n",
  91                         sta_id);
  92                 break;
  93         case ADD_STA_MODIFY_NON_EXIST_STA:
  94                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  95                         sta_id);
  96                 break;
  97         default:
  98                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  99                                 pkt->u.add_sta.status);
 100                 break;
 101         }
 102
 103         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 104                        priv->stations[sta_id].sta.mode ==
 105                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 106                        sta_id, priv->stations[sta_id].sta.sta.addr);
 107
 108         /*
 109          * XXX: The MAC address in the command buffer is often changed from
 110          * the original sent to the device. That is, the MAC address
 111          * written to the command buffer often is not the same MAC address
 112          * read from the command buffer when the command returns. This
 113          * issue has not yet been resolved and this debugging is left to
 114          * observe the problem.
 115          */
 116         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 117                        priv->stations[sta_id].sta.mode ==
 118                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 119                        addsta->sta.addr);
 120         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 121
 122         return ret;
 123 }
 124
 125 int iwl_add_sta_callback(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
 126                                struct iwl_device_cmd *cmd)
 127 {
 128         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 129         struct iwl_addsta_cmd *addsta =
 130                 (struct iwl_addsta_cmd *) cmd->payload;
 131
 132         return iwl_process_add_sta_resp(priv, addsta, pkt);
 133 }
 134
 135 static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 136 {
 137         u16 size = (u16)sizeof(struct iwl_addsta_cmd);
 138         struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
 139         memcpy(addsta, cmd, size);
 140         /* resrved in 5000 */
 141         addsta->rate_n_flags = cpu_to_le16(0);
 142         return size;
 143 }
 144
 145 int iwl_send_add_sta(struct iwl_priv *priv,
 146                      struct iwl_addsta_cmd *sta, u8 flags)
 147 {
 148         int ret = 0;
 149         u8 data[sizeof(*sta)];
 150         struct iwl_host_cmd cmd = {
 151                 .id = REPLY_ADD_STA,
 152                 .flags = flags,
 153                 .data = { data, },
 154         };
 155         u8 sta_id __maybe_unused = sta->sta.sta_id;
 156
 157         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 158                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 159
 160         if (!(flags & CMD_ASYNC)) {
 161                 cmd.flags |= CMD_WANT_SKB;
 162                 might_sleep();
 163         }
 164
 165         cmd.len[0] = iwlagn_build_addsta_hcmd(sta, data);
 166         ret = iwl_trans_send_cmd(trans(priv), &cmd);
 167
 168         if (ret || (flags & CMD_ASYNC))
 169                 return ret;
 170         /*else the command was successfully sent in SYNC mode, need to free
 171          * the reply page */
 172
 173         iwl_free_pages(priv->shrd, cmd.reply_page);
 174
 175         if (cmd.handler_status)
 176                 IWL_ERR(priv, "%s - error in the CMD response %d", __func__,
 177                         cmd.handler_status);
 178
 179         return cmd.handler_status;
 180 }
 181
 182 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 183                                    struct ieee80211_sta *sta,
 184                                    struct iwl_rxon_context *ctx)
 185 {
 186         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 187         __le32 sta_flags;
 188         u8 mimo_ps_mode;
 189
 190         if (!sta || !sta_ht_inf->ht_supported)
 191                 goto done;
 192
 193         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 194         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 195                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 196                         "static" :
 197                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 198                         "dynamic" : "disabled");
 199
 200         sta_flags = priv->stations[index].sta.station_flags;
 201
 202         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 203
 204         switch (mimo_ps_mode) {
 205         case WLAN_HT_CAP_SM_PS_STATIC:
 206                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 207                 break;
 208         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 209                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 210                 break;
 211         case WLAN_HT_CAP_SM_PS_DISABLED:
 212                 break;
 213         default:
 214                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 215                 break;
 216         }
 217
 218         sta_flags |= cpu_to_le32(
 219               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 220
 221         sta_flags |= cpu_to_le32(
 222               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 223
 224         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
 225                 sta_flags |= STA_FLG_HT40_EN_MSK;
 226         else
 227                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 228
 229         priv->stations[index].sta.station_flags = sta_flags;
 230  done:
 231         return;
 232 }
 233
 234 /**
 235  * iwl_prep_station - Prepare station information for addition
 236  *
 237  * should be called with sta_lock held
 238  */
 239 u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 240                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 241 {
 242         struct iwl_station_entry *station;
 243         int i;
 244         u8 sta_id = IWL_INVALID_STATION;
 245
 246         if (is_ap)
 247                 sta_id = ctx->ap_sta_id;
 248         else if (is_broadcast_ether_addr(addr))
 249                 sta_id = ctx->bcast_sta_id;
 250         else
 251                 for (i = IWL_STA_ID; i < IWLAGN_STATION_COUNT; i++) {
 252                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 253                                                 addr)) {
 254                                 sta_id = i;
 255                                 break;
 256                         }
 257
 258                         if (!priv->stations[i].used &&
 259                             sta_id == IWL_INVALID_STATION)
 260                                 sta_id = i;
 261                 }
 262
 263         /*
 264          * These two conditions have the same outcome, but keep them
 265          * separate
 266          */
 267         if (unlikely(sta_id == IWL_INVALID_STATION))
 268                 return sta_id;
 269
 270         /*
 271          * uCode is not able to deal with multiple requests to add a
 272          * station. Keep track if one is in progress so that we do not send
 273          * another.
 274          */
 275         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 276                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 277                                 sta_id);
 278                 return sta_id;
 279         }
 280
 281         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 282             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 283             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 284                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 285                                 sta_id, addr);
 286                 return sta_id;
 287         }
 288
 289         station = &priv->stations[sta_id];
 290         station->used = IWL_STA_DRIVER_ACTIVE;
 291         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 292                         sta_id, addr);
 293         priv->num_stations++;
 294
 295         /* Set up the REPLY_ADD_STA command to send to device */
 296         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 297         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 298         station->sta.mode = 0;
 299         station->sta.sta.sta_id = sta_id;
 300         station->sta.station_flags = ctx->station_flags;
 301         station->ctxid = ctx->ctxid;
 302
 303         if (sta) {
 304                 struct iwl_station_priv *sta_priv;
 305
 306                 sta_priv = (void *)sta->drv_priv;
 307                 sta_priv->ctx = ctx;
 308         }
 309
 310         /*
 311          * OK to call unconditionally, since local stations (IBSS BSSID
 312          * STA and broadcast STA) pass in a NULL sta, and mac80211
 313          * doesn't allow HT IBSS.
 314          */
 315         iwl_set_ht_add_station(priv, sta_id, sta, ctx);
 316
 317         return sta_id;
 318
 319 }
 320
 321 #define STA_WAIT_TIMEOUT (HZ/2)
 322
 323 /**
 324  * iwl_add_station_common -
 325  */
 326 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 327                            const u8 *addr, bool is_ap,
 328                            struct ieee80211_sta *sta, u8 *sta_id_r)
 329 {
 330         unsigned long flags_spin;
 331         int ret = 0;
 332         u8 sta_id;
 333         struct iwl_addsta_cmd sta_cmd;
 334
 335         *sta_id_r = 0;
 336         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 337         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
 338         if (sta_id == IWL_INVALID_STATION) {
 339                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 340                         addr);
 341                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 342                 return -EINVAL;
 343         }
 344
 345         /*
 346          * uCode is not able to deal with multiple requests to add a
 347          * station. Keep track if one is in progress so that we do not send
 348          * another.
 349          */
 350         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 351                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 352                                sta_id);
 353                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 354                 return -EEXIST;
 355         }
 356
 357         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 358             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 359                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 360                                 sta_id, addr);
 361                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 362                 return -EEXIST;
 363         }
 364
 365         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 366         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 367         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 368
 369         /* Add station to device's station table */
 370         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 371         if (ret) {
 372                 spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 373                 IWL_ERR(priv, "Adding station %pM failed.\n",
 374                         priv->stations[sta_id].sta.sta.addr);
 375                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 376                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 377                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 378         }
 379         *sta_id_r = sta_id;
 380         return ret;
 381 }
 382
 383 /**
 384  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 385  *
 386  * priv->shrd->sta_lock must be held
 387  */
 388 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 389 {
 390         /* Ucode must be active and driver must be non active */
 391         if ((priv->stations[sta_id].used &
 392              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 393                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 394
 395         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 396
 397         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 398         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 399 }
 400
 401 static int iwl_send_remove_station(struct iwl_priv *priv,
 402                                    const u8 *addr, int sta_id,
 403                                    bool temporary)
 404 {
 405         struct iwl_rx_packet *pkt;
 406         int ret;
 407
 408         unsigned long flags_spin;
 409         struct iwl_rem_sta_cmd rm_sta_cmd;
 410
 411         struct iwl_host_cmd cmd = {
 412                 .id = REPLY_REMOVE_STA,
 413                 .len = { sizeof(struct iwl_rem_sta_cmd), },
 414                 .flags = CMD_SYNC,
 415                 .data = { &rm_sta_cmd, },
 416         };
 417
 418         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 419         rm_sta_cmd.num_sta = 1;
 420         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 421
 422         cmd.flags |= CMD_WANT_SKB;
 423
 424         ret = iwl_trans_send_cmd(trans(priv), &cmd);
 425
 426         if (ret)
 427                 return ret;
 428
 429         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 430         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 431                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 432                           pkt->hdr.flags);
 433                 ret = -EIO;
 434         }
 435
 436         if (!ret) {
 437                 switch (pkt->u.rem_sta.status) {
 438                 case REM_STA_SUCCESS_MSK:
 439                         if (!temporary) {
 440                                 spin_lock_irqsave(&priv->shrd->sta_lock,
 441                                         flags_spin);
 442                                 iwl_sta_ucode_deactivate(priv, sta_id);
 443                                 spin_unlock_irqrestore(&priv->shrd->sta_lock,
 444                                         flags_spin);
 445                         }
 446                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 447                         break;
 448                 default:
 449                         ret = -EIO;
 450                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 451                         break;
 452                 }
 453         }
 454         iwl_free_pages(priv->shrd, cmd.reply_page);
 455
 456         return ret;
 457 }
 458
 459 /**
 460  * iwl_remove_station - Remove driver's knowledge of station.
 461  */
 462 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 463                        const u8 *addr)
 464 {
 465         unsigned long flags;
 466
 467         if (!iwl_is_ready(priv->shrd)) {
 468                 IWL_DEBUG_INFO(priv,
 469                         "Unable to remove station %pM, device not ready.\n",
 470                         addr);
 471                 /*
 472                  * It is typical for stations to be removed when we are
 473                  * going down. Return success since device will be down
 474                  * soon anyway
 475                  */
 476                 return 0;
 477         }
 478
 479         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 480                         sta_id, addr);
 481
 482         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 483                 return -EINVAL;
 484
 485         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 486
 487         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 488                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 489                                 addr);
 490                 goto out_err;
 491         }
 492
 493         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 494                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 495                                 addr);
 496                 goto out_err;
 497         }
 498
 499         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 500                 kfree(priv->stations[sta_id].lq);
 501                 priv->stations[sta_id].lq = NULL;
 502         }
 503
 504         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 505
 506         priv->num_stations--;
 507
 508         if (WARN_ON(priv->num_stations < 0))
 509                 priv->num_stations = 0;
 510
 511         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 512
 513         return iwl_send_remove_station(priv, addr, sta_id, false);
 514 out_err:
 515         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 516         return -EINVAL;
 517 }
 518
 519 /**
 520  * iwl_clear_ucode_stations - clear ucode station table bits
 521  *
 522  * This function clears all the bits in the driver indicating
 523  * which stations are active in the ucode. Call when something
 524  * other than explicit station management would cause this in
 525  * the ucode, e.g. unassociated RXON.
 526  */
 527 void iwl_clear_ucode_stations(struct iwl_priv *priv,
 528                               struct iwl_rxon_context *ctx)
 529 {
 530         int i;
 531         unsigned long flags_spin;
 532         bool cleared = false;
 533
 534         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 535
 536         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 537         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 538                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 539                         continue;
 540
 541                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 542                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 543                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 544                         cleared = true;
 545                 }
 546         }
 547         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 548
 549         if (!cleared)
 550                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 551 }
 552
 553 /**
 554  * iwl_restore_stations() - Restore driver known stations to device
 555  *
 556  * All stations considered active by driver, but not present in ucode, is
 557  * restored.
 558  *
 559  * Function sleeps.
 560  */
 561 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 562 {
 563         struct iwl_addsta_cmd sta_cmd;
 564         struct iwl_link_quality_cmd lq;
 565         unsigned long flags_spin;
 566         int i;
 567         bool found = false;
 568         int ret;
 569         bool send_lq;
 570
 571         if (!iwl_is_ready(priv->shrd)) {
 572                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 573                 return;
 574         }
 575
 576         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 577         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 578         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 579                 if (ctx->ctxid != priv->stations[i].ctxid)
 580                         continue;
 581                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 582                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 583                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 584                                         priv->stations[i].sta.sta.addr);
 585                         priv->stations[i].sta.mode = 0;
 586                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 587                         found = true;
 588                 }
 589         }
 590
 591         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 592                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 593                         memcpy(&sta_cmd, &priv->stations[i].sta,
 594                                sizeof(struct iwl_addsta_cmd));
 595                         send_lq = false;
 596                         if (priv->stations[i].lq) {
 597                                 if (priv->shrd->wowlan)
 598                                         iwl_sta_fill_lq(priv, ctx, i, &lq);
 599                                 else
 600                                         memcpy(&lq, priv->stations[i].lq,
 601                                                sizeof(struct iwl_link_quality_cmd));
 602                                 send_lq = true;
 603                         }
 604                         spin_unlock_irqrestore(&priv->shrd->sta_lock,
 605                                                flags_spin);
 606                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 607                         if (ret) {
 608                                 spin_lock_irqsave(&priv->shrd->sta_lock,
 609                                                   flags_spin);
 610                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 611                                         priv->stations[i].sta.sta.addr);
 612                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 613                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 614                                 spin_unlock_irqrestore(&priv->shrd->sta_lock,
 615                                                        flags_spin);
 616                         }
 617                         /*
 618                          * Rate scaling has already been initialized, send
 619                          * current LQ command
 620                          */
 621                         if (send_lq)
 622                                 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 623                         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 624                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 625                 }
 626         }
 627
 628         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 629         if (!found)
 630                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 631         else
 632                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 633 }
 634
 635 void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 636 {
 637         unsigned long flags;
 638         int sta_id = ctx->ap_sta_id;
 639         int ret;
 640         struct iwl_addsta_cmd sta_cmd;
 641         struct iwl_link_quality_cmd lq;
 642         bool active;
 643
 644         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 645         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 646                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 647                 return;
 648         }
 649
 650         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
 651         sta_cmd.mode = 0;
 652         memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
 653
 654         active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
 655         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 656         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 657
 658         if (active) {
 659                 ret = iwl_send_remove_station(
 660                         priv, priv->stations[sta_id].sta.sta.addr,
 661                         sta_id, true);
 662                 if (ret)
 663                         IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
 664                                 priv->stations[sta_id].sta.sta.addr, ret);
 665         }
 666         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 667         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
 668         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 669
 670         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 671         if (ret)
 672                 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
 673                         priv->stations[sta_id].sta.sta.addr, ret);
 674         iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 675 }
 676
 677 int iwl_get_free_ucode_key_offset(struct iwl_priv *priv)
 678 {
 679         int i;
 680
 681         for (i = 0; i < priv->sta_key_max_num; i++)
 682                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 683                         return i;
 684
 685         return WEP_INVALID_OFFSET;
 686 }
 687
 688 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
 689 {
 690         unsigned long flags;
 691         int i;
 692
 693         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 694         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 695                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 696                         continue;
 697
 698                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 699                 priv->num_stations--;
 700                 if (WARN_ON(priv->num_stations < 0))
 701                         priv->num_stations = 0;
 702                 kfree(priv->stations[i].lq);
 703                 priv->stations[i].lq = NULL;
 704         }
 705         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 706 }
 707
 708 #ifdef CONFIG_IWLWIFI_DEBUG
 709 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 710                            struct iwl_link_quality_cmd *lq)
 711 {
 712         int i;
 713         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 714         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 715                        lq->general_params.single_stream_ant_msk,
 716                        lq->general_params.dual_stream_ant_msk);
 717
 718         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 719                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 720                                i, lq->rs_table[i].rate_n_flags);
 721 }
 722 #else
 723 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 724                                    struct iwl_link_quality_cmd *lq)
 725 {
 726 }
 727 #endif
 728
 729 /**
 730  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
 731  *
 732  * It sometimes happens when a HT rate has been in use and we
 733  * loose connectivity with AP then mac80211 will first tell us that the
 734  * current channel is not HT anymore before removing the station. In such a
 735  * scenario the RXON flags will be updated to indicate we are not
 736  * communicating HT anymore, but the LQ command may still contain HT rates.
 737  * Test for this to prevent driver from sending LQ command between the time
 738  * RXON flags are updated and when LQ command is updated.
 739  */
 740 static bool is_lq_table_valid(struct iwl_priv *priv,
 741                               struct iwl_rxon_context *ctx,
 742                               struct iwl_link_quality_cmd *lq)
 743 {
 744         int i;
 745
 746         if (ctx->ht.enabled)
 747                 return true;
 748
 749         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 750                        ctx->active.channel);
 751         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 752                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
 753                         IWL_DEBUG_INFO(priv,
 754                                        "index %d of LQ expects HT channel\n",
 755                                        i);
 756                         return false;
 757                 }
 758         }
 759         return true;
 760 }
 761
 762 /**
 763  * iwl_send_lq_cmd() - Send link quality command
 764  * @init: This command is sent as part of station initialization right
 765  *        after station has been added.
 766  *
 767  * The link quality command is sent as the last step of station creation.
 768  * This is the special case in which init is set and we call a callback in
 769  * this case to clear the state indicating that station creation is in
 770  * progress.
 771  */
 772 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 773                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 774 {
 775         int ret = 0;
 776         unsigned long flags_spin;
 777
 778         struct iwl_host_cmd cmd = {
 779                 .id = REPLY_TX_LINK_QUALITY_CMD,
 780                 .len = { sizeof(struct iwl_link_quality_cmd), },
 781                 .flags = flags,
 782                 .data = { lq, },
 783         };
 784
 785         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 786                 return -EINVAL;
 787
 788
 789         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 790         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 791                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 792                 return -EINVAL;
 793         }
 794         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 795
 796         iwl_dump_lq_cmd(priv, lq);
 797         if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
 798                 return -EINVAL;
 799
 800         if (is_lq_table_valid(priv, ctx, lq))
 801                 ret = iwl_trans_send_cmd(trans(priv), &cmd);
 802         else
 803                 ret = -EINVAL;
 804
 805         if (cmd.flags & CMD_ASYNC)
 806                 return ret;
 807
 808         if (init) {
 809                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
 810                                lq->sta_id);
 811                 spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 812                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 813                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 814         }
 815         return ret;
 816 }
 817
 818 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
 819                        struct ieee80211_vif *vif,
 820                        struct ieee80211_sta *sta)
 821 {
 822         struct iwl_priv *priv = hw->priv;
 823         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 824         int ret;
 825
 826         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
 827                         sta->addr);
 828         mutex_lock(&priv->shrd->mutex);
 829         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 830                         sta->addr);
 831         ret = iwl_remove_station(priv, sta_priv->sta_id, sta->addr);
 832         if (ret)
 833                 IWL_ERR(priv, "Error removing station %pM\n",
 834                         sta->addr);
 835         mutex_unlock(&priv->shrd->mutex);
 836         return ret;
 837 }