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
  34 #include "iwl-dev.h"
  35 #include "iwl-core.h"
  36 #include "iwl-sta.h"
  37
  38 /* priv->sta_lock must be held */
  39 static void iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  40 {
  41
  42         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  43                 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u addr %pM\n",
  44                         sta_id, priv->stations[sta_id].sta.sta.addr);
  45
  46         if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  47                 IWL_DEBUG_ASSOC(priv,
  48                                 "STA id %u addr %pM already present in uCode (according to driver)\n",
  49                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  50         } else {
  51                 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
  52                 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
  53                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  54         }
  55 }
  56
  57 static void iwl_process_add_sta_resp(struct iwl_priv *priv,
  58                                      struct iwl_addsta_cmd *addsta,
  59                                      struct iwl_rx_packet *pkt,
  60                                      bool sync)
  61 {
  62         u8 sta_id = addsta->sta.sta_id;
  63         unsigned long flags;
  64
  65         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  66                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  67                         pkt->hdr.flags);
  68                 return;
  69         }
  70
  71         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  72                        sta_id);
  73
  74         spin_lock_irqsave(&priv->sta_lock, flags);
  75
  76         switch (pkt->u.add_sta.status) {
  77         case ADD_STA_SUCCESS_MSK:
  78                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  79                 iwl_sta_ucode_activate(priv, sta_id);
  80                 break;
  81         case ADD_STA_NO_ROOM_IN_TABLE:
  82                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  83                         sta_id);
  84                 break;
  85         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  86                 IWL_ERR(priv, "Adding station %d failed, no block ack resource.\n",
  87                         sta_id);
  88                 break;
  89         case ADD_STA_MODIFY_NON_EXIST_STA:
  90                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  91                         sta_id);
  92                 break;
  93         default:
  94                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  95                                 pkt->u.add_sta.status);
  96                 break;
  97         }
  98
  99         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 100                        priv->stations[sta_id].sta.mode ==
 101                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 102                        sta_id, priv->stations[sta_id].sta.sta.addr);
 103
 104         /*
 105          * XXX: The MAC address in the command buffer is often changed from
 106          * the original sent to the device. That is, the MAC address
 107          * written to the command buffer often is not the same MAC adress
 108          * read from the command buffer when the command returns. This
 109          * issue has not yet been resolved and this debugging is left to
 110          * observe the problem.
 111          */
 112         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 113                        priv->stations[sta_id].sta.mode ==
 114                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 115                        addsta->sta.addr);
 116         spin_unlock_irqrestore(&priv->sta_lock, flags);
 117 }
 118
 119 static void iwl_add_sta_callback(struct iwl_priv *priv,
 120                                  struct iwl_device_cmd *cmd,
 121                                  struct iwl_rx_packet *pkt)
 122 {
 123         struct iwl_addsta_cmd *addsta =
 124                 (struct iwl_addsta_cmd *)cmd->cmd.payload;
 125
 126         iwl_process_add_sta_resp(priv, addsta, pkt, false);
 127
 128 }
 129
 130 int iwl_send_add_sta(struct iwl_priv *priv,
 131                      struct iwl_addsta_cmd *sta, u8 flags)
 132 {
 133         struct iwl_rx_packet *pkt = NULL;
 134         int ret = 0;
 135         u8 data[sizeof(*sta)];
 136         struct iwl_host_cmd cmd = {
 137                 .id = REPLY_ADD_STA,
 138                 .flags = flags,
 139                 .data = data,
 140         };
 141         u8 sta_id __maybe_unused = sta->sta.sta_id;
 142
 143         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 144                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 145
 146         if (flags & CMD_ASYNC)
 147                 cmd.callback = iwl_add_sta_callback;
 148         else
 149                 cmd.flags |= CMD_WANT_SKB;
 150
 151         cmd.len = priv->cfg->ops->utils->build_addsta_hcmd(sta, data);
 152         ret = iwl_send_cmd(priv, &cmd);
 153
 154         if (ret || (flags & CMD_ASYNC))
 155                 return ret;
 156
 157         if (ret == 0) {
 158                 pkt = (struct iwl_rx_packet *)cmd.reply_page;
 159                 iwl_process_add_sta_resp(priv, sta, pkt, true);
 160         }
 161         iwl_free_pages(priv, cmd.reply_page);
 162
 163         return ret;
 164 }
 165 EXPORT_SYMBOL(iwl_send_add_sta);
 166
 167 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 168                                    struct ieee80211_sta_ht_cap *sta_ht_inf)
 169 {
 170         __le32 sta_flags;
 171         u8 mimo_ps_mode;
 172
 173         if (!sta_ht_inf || !sta_ht_inf->ht_supported)
 174                 goto done;
 175
 176         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 177         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 178                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 179                         "static" :
 180                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 181                         "dynamic" : "disabled");
 182
 183         sta_flags = priv->stations[index].sta.station_flags;
 184
 185         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 186
 187         switch (mimo_ps_mode) {
 188         case WLAN_HT_CAP_SM_PS_STATIC:
 189                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 190                 break;
 191         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 192                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 193                 break;
 194         case WLAN_HT_CAP_SM_PS_DISABLED:
 195                 break;
 196         default:
 197                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 198                 break;
 199         }
 200
 201         sta_flags |= cpu_to_le32(
 202               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 203
 204         sta_flags |= cpu_to_le32(
 205               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 206
 207         if (iwl_is_ht40_tx_allowed(priv, sta_ht_inf))
 208                 sta_flags |= STA_FLG_HT40_EN_MSK;
 209         else
 210                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 211
 212         priv->stations[index].sta.station_flags = sta_flags;
 213  done:
 214         return;
 215 }
 216
 217 /**
 218  * iwl_prep_station - Prepare station information for addition
 219  *
 220  * should be called with sta_lock held
 221  */
 222 static u8 iwl_prep_station(struct iwl_priv *priv, const u8 *addr,
 223                            bool is_ap,
 224                            struct ieee80211_sta_ht_cap *ht_info)
 225 {
 226         struct iwl_station_entry *station;
 227         int i;
 228         u8 sta_id = IWL_INVALID_STATION;
 229         u16 rate;
 230
 231         if (is_ap)
 232                 sta_id = IWL_AP_ID;
 233         else if (is_broadcast_ether_addr(addr))
 234                 sta_id = priv->hw_params.bcast_sta_id;
 235         else
 236                 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
 237                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 238                                                 addr)) {
 239                                 sta_id = i;
 240                                 break;
 241                         }
 242
 243                         if (!priv->stations[i].used &&
 244                             sta_id == IWL_INVALID_STATION)
 245                                 sta_id = i;
 246                 }
 247
 248         /*
 249          * These two conditions have the same outcome, but keep them
 250          * separate
 251          */
 252         if (unlikely(sta_id == IWL_INVALID_STATION))
 253                 return sta_id;
 254
 255         /*
 256          * uCode is not able to deal with multiple requests to add a
 257          * station. Keep track if one is in progress so that we do not send
 258          * another.
 259          */
 260         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 261                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 262                                 sta_id);
 263                 return sta_id;
 264         }
 265
 266         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 267             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 268             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 269                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 270                                 sta_id, addr);
 271                 return sta_id;
 272         }
 273
 274         station = &priv->stations[sta_id];
 275         station->used = IWL_STA_DRIVER_ACTIVE;
 276         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 277                         sta_id, addr);
 278         priv->num_stations++;
 279
 280         /* Set up the REPLY_ADD_STA command to send to device */
 281         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 282         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 283         station->sta.mode = 0;
 284         station->sta.sta.sta_id = sta_id;
 285         station->sta.station_flags = 0;
 286
 287         /*
 288          * OK to call unconditionally, since local stations (IBSS BSSID
 289          * STA and broadcast STA) pass in a NULL ht_info, and mac80211
 290          * doesn't allow HT IBSS.
 291          */
 292         iwl_set_ht_add_station(priv, sta_id, ht_info);
 293
 294         /* 3945 only */
 295         rate = (priv->band == IEEE80211_BAND_5GHZ) ?
 296                 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
 297         /* Turn on both antennas for the station... */
 298         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 299
 300         return sta_id;
 301
 302 }
 303
 304 #define STA_WAIT_TIMEOUT (HZ/2)
 305
 306 /**
 307  * iwl_add_station_common -
 308  */
 309 int iwl_add_station_common(struct iwl_priv *priv, const u8 *addr,
 310                                   bool is_ap,
 311                                   struct ieee80211_sta_ht_cap *ht_info,
 312                                   u8 *sta_id_r)
 313 {
 314         struct iwl_station_entry *station;
 315         unsigned long flags_spin;
 316         int ret = 0;
 317         u8 sta_id;
 318
 319         *sta_id_r = 0;
 320         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 321         sta_id = iwl_prep_station(priv, addr, is_ap, ht_info);
 322         if (sta_id == IWL_INVALID_STATION) {
 323                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 324                         addr);
 325                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 326                 return -EINVAL;
 327         }
 328
 329         /*
 330          * uCode is not able to deal with multiple requests to add a
 331          * station. Keep track if one is in progress so that we do not send
 332          * another.
 333          */
 334         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 335                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 336                                sta_id);
 337                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 338                 return -EEXIST;
 339         }
 340
 341         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 342             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 343                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 344                                 sta_id, addr);
 345                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 346                 return -EEXIST;
 347         }
 348
 349         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 350         station = &priv->stations[sta_id];
 351         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 352
 353         /* Add station to device's station table */
 354         ret = iwl_send_add_sta(priv, &station->sta, CMD_SYNC);
 355         if (ret) {
 356                 IWL_ERR(priv, "Adding station %pM failed.\n", station->sta.sta.addr);
 357                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 358                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 359                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 360                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 361         }
 362         *sta_id_r = sta_id;
 363         return ret;
 364 }
 365 EXPORT_SYMBOL(iwl_add_station_common);
 366
 367 static struct iwl_link_quality_cmd *iwl_sta_alloc_lq(struct iwl_priv *priv,
 368                                                      u8 sta_id)
 369 {
 370         int i, r;
 371         struct iwl_link_quality_cmd *link_cmd;
 372         u32 rate_flags;
 373
 374         link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
 375         if (!link_cmd) {
 376                 IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
 377                 return NULL;
 378         }
 379         /* Set up the rate scaling to start at selected rate, fall back
 380          * all the way down to 1M in IEEE order, and then spin on 1M */
 381         if (priv->band == IEEE80211_BAND_5GHZ)
 382                 r = IWL_RATE_6M_INDEX;
 383         else
 384                 r = IWL_RATE_1M_INDEX;
 385
 386         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 387                 rate_flags = 0;
 388                 if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
 389                         rate_flags |= RATE_MCS_CCK_MSK;
 390
 391                 rate_flags |= first_antenna(priv->hw_params.valid_tx_ant) <<
 392                                 RATE_MCS_ANT_POS;
 393
 394                 link_cmd->rs_table[i].rate_n_flags =
 395                         iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
 396                 r = iwl_get_prev_ieee_rate(r);
 397         }
 398
 399         link_cmd->general_params.single_stream_ant_msk =
 400                                 first_antenna(priv->hw_params.valid_tx_ant);
 401
 402         link_cmd->general_params.dual_stream_ant_msk =
 403                 priv->hw_params.valid_tx_ant &
 404                 ~first_antenna(priv->hw_params.valid_tx_ant);
 405         if (!link_cmd->general_params.dual_stream_ant_msk) {
 406                 link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
 407         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
 408                 link_cmd->general_params.dual_stream_ant_msk =
 409                         priv->hw_params.valid_tx_ant;
 410         }
 411
 412         link_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
 413         link_cmd->agg_params.agg_time_limit =
 414                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
 415
 416         link_cmd->sta_id = sta_id;
 417
 418         return link_cmd;
 419 }
 420
 421 /*
 422  * iwl_add_bssid_station - Add the special IBSS BSSID station
 423  *
 424  * Function sleeps.
 425  */
 426 int iwl_add_bssid_station(struct iwl_priv *priv, const u8 *addr, bool init_rs,
 427                           u8 *sta_id_r)
 428 {
 429         int ret;
 430         u8 sta_id;
 431         struct iwl_link_quality_cmd *link_cmd;
 432         unsigned long flags;
 433
 434         if (sta_id_r)
 435                 *sta_id_r = IWL_INVALID_STATION;
 436
 437         ret = iwl_add_station_common(priv, addr, 0, NULL, &sta_id);
 438         if (ret) {
 439                 IWL_ERR(priv, "Unable to add station %pM\n", addr);
 440                 return ret;
 441         }
 442
 443         if (sta_id_r)
 444                 *sta_id_r = sta_id;
 445
 446         spin_lock_irqsave(&priv->sta_lock, flags);
 447         priv->stations[sta_id].used |= IWL_STA_LOCAL;
 448         spin_unlock_irqrestore(&priv->sta_lock, flags);
 449
 450         if (init_rs) {
 451                 /* Set up default rate scaling table in device's station table */
 452                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
 453                 if (!link_cmd) {
 454                         IWL_ERR(priv, "Unable to initialize rate scaling for station %pM.\n",
 455                                 addr);
 456                         return -ENOMEM;
 457                 }
 458
 459                 ret = iwl_send_lq_cmd(priv, link_cmd, CMD_SYNC, true);
 460                 if (ret)
 461                         IWL_ERR(priv, "Link quality command failed (%d)\n", ret);
 462
 463                 spin_lock_irqsave(&priv->sta_lock, flags);
 464                 priv->stations[sta_id].lq = link_cmd;
 465                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 466         }
 467
 468         return 0;
 469 }
 470 EXPORT_SYMBOL(iwl_add_bssid_station);
 471
 472 /**
 473  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 474  *
 475  * priv->sta_lock must be held
 476  */
 477 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 478 {
 479         /* Ucode must be active and driver must be non active */
 480         if ((priv->stations[sta_id].used &
 481              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 482                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 483
 484         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 485
 486         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 487         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 488 }
 489
 490 static int iwl_send_remove_station(struct iwl_priv *priv,
 491                                    struct iwl_station_entry *station)
 492 {
 493         struct iwl_rx_packet *pkt;
 494         int ret;
 495
 496         unsigned long flags_spin;
 497         struct iwl_rem_sta_cmd rm_sta_cmd;
 498
 499         struct iwl_host_cmd cmd = {
 500                 .id = REPLY_REMOVE_STA,
 501                 .len = sizeof(struct iwl_rem_sta_cmd),
 502                 .flags = CMD_SYNC,
 503                 .data = &rm_sta_cmd,
 504         };
 505
 506         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 507         rm_sta_cmd.num_sta = 1;
 508         memcpy(&rm_sta_cmd.addr, &station->sta.sta.addr , ETH_ALEN);
 509
 510         cmd.flags |= CMD_WANT_SKB;
 511
 512         ret = iwl_send_cmd(priv, &cmd);
 513
 514         if (ret)
 515                 return ret;
 516
 517         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 518         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 519                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 520                           pkt->hdr.flags);
 521                 ret = -EIO;
 522         }
 523
 524         if (!ret) {
 525                 switch (pkt->u.rem_sta.status) {
 526                 case REM_STA_SUCCESS_MSK:
 527                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 528                         iwl_sta_ucode_deactivate(priv, station->sta.sta.sta_id);
 529                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 530                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 531                         break;
 532                 default:
 533                         ret = -EIO;
 534                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 535                         break;
 536                 }
 537         }
 538         iwl_free_pages(priv, cmd.reply_page);
 539
 540         return ret;
 541 }
 542
 543 /**
 544  * iwl_remove_station - Remove driver's knowledge of station.
 545  */
 546 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 547                        const u8 *addr)
 548 {
 549         struct iwl_station_entry *station;
 550         unsigned long flags;
 551
 552         if (!iwl_is_ready(priv)) {
 553                 IWL_DEBUG_INFO(priv,
 554                         "Unable to remove station %pM, device not ready.\n",
 555                         addr);
 556                 /*
 557                  * It is typical for stations to be removed when we are
 558                  * going down. Return success since device will be down
 559                  * soon anyway
 560                  */
 561                 return 0;
 562         }
 563
 564         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 565                         sta_id, addr);
 566
 567         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 568                 return -EINVAL;
 569
 570         spin_lock_irqsave(&priv->sta_lock, flags);
 571
 572         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 573                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 574                                 addr);
 575                 goto out_err;
 576         }
 577
 578         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 579                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 580                                 addr);
 581                 goto out_err;
 582         }
 583
 584         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 585                 kfree(priv->stations[sta_id].lq);
 586                 priv->stations[sta_id].lq = NULL;
 587         }
 588
 589         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 590
 591         priv->num_stations--;
 592
 593         BUG_ON(priv->num_stations < 0);
 594
 595         station = &priv->stations[sta_id];
 596         spin_unlock_irqrestore(&priv->sta_lock, flags);
 597
 598         return iwl_send_remove_station(priv, station);
 599 out_err:
 600         spin_unlock_irqrestore(&priv->sta_lock, flags);
 601         return -EINVAL;
 602 }
 603 EXPORT_SYMBOL_GPL(iwl_remove_station);
 604
 605 /**
 606  * iwl_clear_ucode_stations - clear ucode station table bits
 607  *
 608  * This function clears all the bits in the driver indicating
 609  * which stations are active in the ucode. Call when something
 610  * other than explicit station management would cause this in
 611  * the ucode, e.g. unassociated RXON.
 612  */
 613 void iwl_clear_ucode_stations(struct iwl_priv *priv)
 614 {
 615         int i;
 616         unsigned long flags_spin;
 617         bool cleared = false;
 618
 619         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 620
 621         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 622         for (i = 0; i < priv->hw_params.max_stations; i++) {
 623                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 624                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 625                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 626                         cleared = true;
 627                 }
 628         }
 629         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 630
 631         if (!cleared)
 632                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 633 }
 634 EXPORT_SYMBOL(iwl_clear_ucode_stations);
 635
 636 /**
 637  * iwl_restore_stations() - Restore driver known stations to device
 638  *
 639  * All stations considered active by driver, but not present in ucode, is
 640  * restored.
 641  *
 642  * Function sleeps.
 643  */
 644 void iwl_restore_stations(struct iwl_priv *priv)
 645 {
 646         struct iwl_station_entry *station;
 647         unsigned long flags_spin;
 648         int i;
 649         bool found = false;
 650         int ret;
 651
 652         if (!iwl_is_ready(priv)) {
 653                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 654                 return;
 655         }
 656
 657         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 658         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 659         for (i = 0; i < priv->hw_params.max_stations; i++) {
 660                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 661                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 662                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 663                                         priv->stations[i].sta.sta.addr);
 664                         priv->stations[i].sta.mode = 0;
 665                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 666                         found = true;
 667                 }
 668         }
 669
 670         for (i = 0; i < priv->hw_params.max_stations; i++) {
 671                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 672                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 673                         station = &priv->stations[i];
 674                         ret = iwl_send_add_sta(priv, &priv->stations[i].sta, CMD_SYNC);
 675                         if (ret) {
 676                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 677                                         station->sta.sta.addr);
 678                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 679                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 680                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 681                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 682                         }
 683                         /*
 684                          * Rate scaling has already been initialized, send
 685                          * current LQ command
 686                          */
 687                         if (station->lq)
 688                                 iwl_send_lq_cmd(priv, station->lq, CMD_SYNC, true);
 689                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 690                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 691                 }
 692         }
 693
 694         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 695         if (!found)
 696                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 697         else
 698                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 699 }
 700 EXPORT_SYMBOL(iwl_restore_stations);
 701
 702 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
 703 {
 704         int i;
 705
 706         for (i = 0; i < STA_KEY_MAX_NUM; i++)
 707                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 708                         return i;
 709
 710         return WEP_INVALID_OFFSET;
 711 }
 712 EXPORT_SYMBOL(iwl_get_free_ucode_key_index);
 713
 714 static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
 715 {
 716         int i, not_empty = 0;
 717         u8 buff[sizeof(struct iwl_wep_cmd) +
 718                 sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
 719         struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
 720         size_t cmd_size  = sizeof(struct iwl_wep_cmd);
 721         struct iwl_host_cmd cmd = {
 722                 .id = REPLY_WEPKEY,
 723                 .data = wep_cmd,
 724                 .flags = CMD_SYNC,
 725         };
 726
 727         might_sleep();
 728
 729         memset(wep_cmd, 0, cmd_size +
 730                         (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 731
 732         for (i = 0; i < WEP_KEYS_MAX ; i++) {
 733                 wep_cmd->key[i].key_index = i;
 734                 if (priv->wep_keys[i].key_size) {
 735                         wep_cmd->key[i].key_offset = i;
 736                         not_empty = 1;
 737                 } else {
 738                         wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
 739                 }
 740
 741                 wep_cmd->key[i].key_size = priv->wep_keys[i].key_size;
 742                 memcpy(&wep_cmd->key[i].key[3], priv->wep_keys[i].key,
 743                                 priv->wep_keys[i].key_size);
 744         }
 745
 746         wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
 747         wep_cmd->num_keys = WEP_KEYS_MAX;
 748
 749         cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
 750
 751         cmd.len = cmd_size;
 752
 753         if (not_empty || send_if_empty)
 754                 return iwl_send_cmd(priv, &cmd);
 755         else
 756                 return 0;
 757 }
 758
 759 int iwl_restore_default_wep_keys(struct iwl_priv *priv)
 760 {
 761         WARN_ON(!mutex_is_locked(&priv->mutex));
 762
 763         return iwl_send_static_wepkey_cmd(priv, 0);
 764 }
 765 EXPORT_SYMBOL(iwl_restore_default_wep_keys);
 766
 767 int iwl_remove_default_wep_key(struct iwl_priv *priv,
 768                                struct ieee80211_key_conf *keyconf)
 769 {
 770         int ret;
 771
 772         WARN_ON(!mutex_is_locked(&priv->mutex));
 773
 774         IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
 775                       keyconf->keyidx);
 776
 777         memset(&priv->wep_keys[keyconf->keyidx], 0, sizeof(priv->wep_keys[0]));
 778         if (iwl_is_rfkill(priv)) {
 779                 IWL_DEBUG_WEP(priv, "Not sending REPLY_WEPKEY command due to RFKILL.\n");
 780                 /* but keys in device are clear anyway so return success */
 781                 return 0;
 782         }
 783         ret = iwl_send_static_wepkey_cmd(priv, 1);
 784         IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
 785                       keyconf->keyidx, ret);
 786
 787         return ret;
 788 }
 789 EXPORT_SYMBOL(iwl_remove_default_wep_key);
 790
 791 int iwl_set_default_wep_key(struct iwl_priv *priv,
 792                             struct ieee80211_key_conf *keyconf)
 793 {
 794         int ret;
 795
 796         WARN_ON(!mutex_is_locked(&priv->mutex));
 797
 798         if (keyconf->keylen != WEP_KEY_LEN_128 &&
 799             keyconf->keylen != WEP_KEY_LEN_64) {
 800                 IWL_DEBUG_WEP(priv, "Bad WEP key length %d\n", keyconf->keylen);
 801                 return -EINVAL;
 802         }
 803
 804         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 805         keyconf->hw_key_idx = HW_KEY_DEFAULT;
 806         priv->stations[IWL_AP_ID].keyinfo.alg = ALG_WEP;
 807
 808         priv->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
 809         memcpy(&priv->wep_keys[keyconf->keyidx].key, &keyconf->key,
 810                                                         keyconf->keylen);
 811
 812         ret = iwl_send_static_wepkey_cmd(priv, 0);
 813         IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
 814                 keyconf->keylen, keyconf->keyidx, ret);
 815
 816         return ret;
 817 }
 818 EXPORT_SYMBOL(iwl_set_default_wep_key);
 819
 820 static int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
 821                                 struct ieee80211_key_conf *keyconf,
 822                                 u8 sta_id)
 823 {
 824         unsigned long flags;
 825         __le16 key_flags = 0;
 826         int ret;
 827
 828         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 829
 830         key_flags |= (STA_KEY_FLG_WEP | STA_KEY_FLG_MAP_KEY_MSK);
 831         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 832         key_flags &= ~STA_KEY_FLG_INVALID;
 833
 834         if (keyconf->keylen == WEP_KEY_LEN_128)
 835                 key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
 836
 837         if (sta_id == priv->hw_params.bcast_sta_id)
 838                 key_flags |= STA_KEY_MULTICAST_MSK;
 839
 840         spin_lock_irqsave(&priv->sta_lock, flags);
 841
 842         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 843         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 844         priv->stations[sta_id].keyinfo.keyidx = keyconf->keyidx;
 845
 846         memcpy(priv->stations[sta_id].keyinfo.key,
 847                                 keyconf->key, keyconf->keylen);
 848
 849         memcpy(&priv->stations[sta_id].sta.key.key[3],
 850                                 keyconf->key, keyconf->keylen);
 851
 852         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 853                         == STA_KEY_FLG_NO_ENC)
 854                 priv->stations[sta_id].sta.key.key_offset =
 855                                  iwl_get_free_ucode_key_index(priv);
 856         /* else, we are overriding an existing key => no need to allocated room
 857          * in uCode. */
 858
 859         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 860                 "no space for a new key");
 861
 862         priv->stations[sta_id].sta.key.key_flags = key_flags;
 863         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 864         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 865
 866         ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
 867
 868         spin_unlock_irqrestore(&priv->sta_lock, flags);
 869
 870         return ret;
 871 }
 872
 873 static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
 874                                    struct ieee80211_key_conf *keyconf,
 875                                    u8 sta_id)
 876 {
 877         unsigned long flags;
 878         __le16 key_flags = 0;
 879         int ret;
 880
 881         key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
 882         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 883         key_flags &= ~STA_KEY_FLG_INVALID;
 884
 885         if (sta_id == priv->hw_params.bcast_sta_id)
 886                 key_flags |= STA_KEY_MULTICAST_MSK;
 887
 888         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 889
 890         spin_lock_irqsave(&priv->sta_lock, flags);
 891         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 892         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 893
 894         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
 895                keyconf->keylen);
 896
 897         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
 898                keyconf->keylen);
 899
 900         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 901                         == STA_KEY_FLG_NO_ENC)
 902                 priv->stations[sta_id].sta.key.key_offset =
 903                                  iwl_get_free_ucode_key_index(priv);
 904         /* else, we are overriding an existing key => no need to allocated room
 905          * in uCode. */
 906
 907         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 908                 "no space for a new key");
 909
 910         priv->stations[sta_id].sta.key.key_flags = key_flags;
 911         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 912         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 913
 914         ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
 915
 916         spin_unlock_irqrestore(&priv->sta_lock, flags);
 917
 918         return ret;
 919 }
 920
 921 static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
 922                                    struct ieee80211_key_conf *keyconf,
 923                                    u8 sta_id)
 924 {
 925         unsigned long flags;
 926         int ret = 0;
 927         __le16 key_flags = 0;
 928
 929         key_flags |= (STA_KEY_FLG_TKIP | STA_KEY_FLG_MAP_KEY_MSK);
 930         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 931         key_flags &= ~STA_KEY_FLG_INVALID;
 932
 933         if (sta_id == priv->hw_params.bcast_sta_id)
 934                 key_flags |= STA_KEY_MULTICAST_MSK;
 935
 936         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 937         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 938
 939         spin_lock_irqsave(&priv->sta_lock, flags);
 940
 941         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 942         priv->stations[sta_id].keyinfo.keylen = 16;
 943
 944         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 945                         == STA_KEY_FLG_NO_ENC)
 946                 priv->stations[sta_id].sta.key.key_offset =
 947                                  iwl_get_free_ucode_key_index(priv);
 948         /* else, we are overriding an existing key => no need to allocated room
 949          * in uCode. */
 950
 951         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 952                 "no space for a new key");
 953
 954         priv->stations[sta_id].sta.key.key_flags = key_flags;
 955
 956
 957         /* This copy is acutally not needed: we get the key with each TX */
 958         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key, 16);
 959
 960         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key, 16);
 961
 962         spin_unlock_irqrestore(&priv->sta_lock, flags);
 963
 964         return ret;
 965 }
 966
 967 void iwl_update_tkip_key(struct iwl_priv *priv,
 968                         struct ieee80211_key_conf *keyconf,
 969                         struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
 970 {
 971         u8 sta_id;
 972         unsigned long flags;
 973         int i;
 974
 975         if (sta) {
 976                 sta_id = iwl_sta_id(sta);
 977
 978                 if (sta_id == IWL_INVALID_STATION) {
 979                         IWL_DEBUG_MAC80211(priv, "leave - %pM not initialised.\n",
 980                                            sta->addr);
 981                         return;
 982                 }
 983         } else
 984                 sta_id = priv->hw_params.bcast_sta_id;
 985
 986
 987         if (iwl_scan_cancel(priv)) {
 988                 /* cancel scan failed, just live w/ bad key and rely
 989                    briefly on SW decryption */
 990                 return;
 991         }
 992
 993         spin_lock_irqsave(&priv->sta_lock, flags);
 994
 995         priv->stations[sta_id].sta.key.tkip_rx_tsc_byte2 = (u8) iv32;
 996
 997         for (i = 0; i < 5; i++)
 998                 priv->stations[sta_id].sta.key.tkip_rx_ttak[i] =
 999                         cpu_to_le16(phase1key[i]);
1000
1001         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
1002         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1003
1004         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1005
1006         spin_unlock_irqrestore(&priv->sta_lock, flags);
1007
1008 }
1009 EXPORT_SYMBOL(iwl_update_tkip_key);
1010
1011 int iwl_remove_dynamic_key(struct iwl_priv *priv,
1012                                 struct ieee80211_key_conf *keyconf,
1013                                 u8 sta_id)
1014 {
1015         unsigned long flags;
1016         int ret = 0;
1017         u16 key_flags;
1018         u8 keyidx;
1019
1020         priv->key_mapping_key--;
1021
1022         spin_lock_irqsave(&priv->sta_lock, flags);
1023         key_flags = le16_to_cpu(priv->stations[sta_id].sta.key.key_flags);
1024         keyidx = (key_flags >> STA_KEY_FLG_KEYID_POS) & 0x3;
1025
1026         IWL_DEBUG_WEP(priv, "Remove dynamic key: idx=%d sta=%d\n",
1027                       keyconf->keyidx, sta_id);
1028
1029         if (keyconf->keyidx != keyidx) {
1030                 /* We need to remove a key with index different that the one
1031                  * in the uCode. This means that the key we need to remove has
1032                  * been replaced by another one with different index.
1033                  * Don't do anything and return ok
1034                  */
1035                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1036                 return 0;
1037         }
1038
1039         if (priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET) {
1040                 IWL_WARN(priv, "Removing wrong key %d 0x%x\n",
1041                             keyconf->keyidx, key_flags);
1042                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1043                 return 0;
1044         }
1045
1046         if (!test_and_clear_bit(priv->stations[sta_id].sta.key.key_offset,
1047                 &priv->ucode_key_table))
1048                 IWL_ERR(priv, "index %d not used in uCode key table.\n",
1049                         priv->stations[sta_id].sta.key.key_offset);
1050         memset(&priv->stations[sta_id].keyinfo, 0,
1051                                         sizeof(struct iwl_hw_key));
1052         memset(&priv->stations[sta_id].sta.key, 0,
1053                                         sizeof(struct iwl4965_keyinfo));
1054         priv->stations[sta_id].sta.key.key_flags =
1055                         STA_KEY_FLG_NO_ENC | STA_KEY_FLG_INVALID;
1056         priv->stations[sta_id].sta.key.key_offset = WEP_INVALID_OFFSET;
1057         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
1058         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1059
1060         if (iwl_is_rfkill(priv)) {
1061                 IWL_DEBUG_WEP(priv, "Not sending REPLY_ADD_STA command because RFKILL enabled.\n");
1062                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1063                 return 0;
1064         }
1065         ret =  iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1066         spin_unlock_irqrestore(&priv->sta_lock, flags);
1067         return ret;
1068 }
1069 EXPORT_SYMBOL(iwl_remove_dynamic_key);
1070
1071 int iwl_set_dynamic_key(struct iwl_priv *priv,
1072                                 struct ieee80211_key_conf *keyconf, u8 sta_id)
1073 {
1074         int ret;
1075
1076         priv->key_mapping_key++;
1077         keyconf->hw_key_idx = HW_KEY_DYNAMIC;
1078
1079         switch (keyconf->alg) {
1080         case ALG_CCMP:
1081                 ret = iwl_set_ccmp_dynamic_key_info(priv, keyconf, sta_id);
1082                 break;
1083         case ALG_TKIP:
1084                 ret = iwl_set_tkip_dynamic_key_info(priv, keyconf, sta_id);
1085                 break;
1086         case ALG_WEP:
1087                 ret = iwl_set_wep_dynamic_key_info(priv, keyconf, sta_id);
1088                 break;
1089         default:
1090                 IWL_ERR(priv,
1091                         "Unknown alg: %s alg = %d\n", __func__, keyconf->alg);
1092                 ret = -EINVAL;
1093         }
1094
1095         IWL_DEBUG_WEP(priv, "Set dynamic key: alg= %d len=%d idx=%d sta=%d ret=%d\n",
1096                       keyconf->alg, keyconf->keylen, keyconf->keyidx,
1097                       sta_id, ret);
1098
1099         return ret;
1100 }
1101 EXPORT_SYMBOL(iwl_set_dynamic_key);
1102
1103 #ifdef CONFIG_IWLWIFI_DEBUG
1104 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
1105                            struct iwl_link_quality_cmd *lq)
1106 {
1107         int i;
1108         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
1109         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
1110                        lq->general_params.single_stream_ant_msk,
1111                        lq->general_params.dual_stream_ant_msk);
1112
1113         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
1114                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
1115                                i, lq->rs_table[i].rate_n_flags);
1116 }
1117 #else
1118 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
1119                                    struct iwl_link_quality_cmd *lq)
1120 {
1121 }
1122 #endif
1123
1124 /**
1125  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
1126  *
1127  * It sometimes happens when a HT rate has been in use and we
1128  * loose connectivity with AP then mac80211 will first tell us that the
1129  * current channel is not HT anymore before removing the station. In such a
1130  * scenario the RXON flags will be updated to indicate we are not
1131  * communicating HT anymore, but the LQ command may still contain HT rates.
1132  * Test for this to prevent driver from sending LQ command between the time
1133  * RXON flags are updated and when LQ command is updated.
1134  */
1135 static bool is_lq_table_valid(struct iwl_priv *priv,
1136                               struct iwl_link_quality_cmd *lq)
1137 {
1138         int i;
1139         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
1140
1141         if (ht_conf->is_ht)
1142                 return true;
1143
1144         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
1145                        priv->active_rxon.channel);
1146         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
1147                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
1148                         IWL_DEBUG_INFO(priv,
1149                                        "index %d of LQ expects HT channel\n",
1150                                        i);
1151                         return false;
1152                 }
1153         }
1154         return true;
1155 }
1156
1157 /**
1158  * iwl_send_lq_cmd() - Send link quality command
1159  * @init: This command is sent as part of station initialization right
1160  *        after station has been added.
1161  *
1162  * The link quality command is sent as the last step of station creation.
1163  * This is the special case in which init is set and we call a callback in
1164  * this case to clear the state indicating that station creation is in
1165  * progress.
1166  */
1167 int iwl_send_lq_cmd(struct iwl_priv *priv,
1168                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
1169 {
1170         int ret = 0;
1171         unsigned long flags_spin;
1172
1173         struct iwl_host_cmd cmd = {
1174                 .id = REPLY_TX_LINK_QUALITY_CMD,
1175                 .len = sizeof(struct iwl_link_quality_cmd),
1176                 .flags = flags,
1177                 .data = lq,
1178         };
1179
1180         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
1181                 return -EINVAL;
1182
1183         iwl_dump_lq_cmd(priv, lq);
1184         BUG_ON(init && (cmd.flags & CMD_ASYNC));
1185
1186         if (is_lq_table_valid(priv, lq))
1187                 ret = iwl_send_cmd(priv, &cmd);
1188         else
1189                 ret = -EINVAL;
1190
1191         if (cmd.flags & CMD_ASYNC)
1192                 return ret;
1193
1194         if (init) {
1195                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
1196                                lq->sta_id);
1197                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
1198                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
1199                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
1200         }
1201         return ret;
1202 }
1203 EXPORT_SYMBOL(iwl_send_lq_cmd);
1204
1205 /**
1206  * iwl_alloc_bcast_station - add broadcast station into driver's station table.
1207  *
1208  * This adds the broadcast station into the driver's station table
1209  * and marks it driver active, so that it will be restored to the
1210  * device at the next best time.
1211  */
1212 int iwl_alloc_bcast_station(struct iwl_priv *priv, bool init_lq)
1213 {
1214         struct iwl_link_quality_cmd *link_cmd;
1215         unsigned long flags;
1216         u8 sta_id;
1217
1218         spin_lock_irqsave(&priv->sta_lock, flags);
1219         sta_id = iwl_prep_station(priv, iwl_bcast_addr, false, NULL);
1220         if (sta_id == IWL_INVALID_STATION) {
1221                 IWL_ERR(priv, "Unable to prepare broadcast station\n");
1222                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1223
1224                 return -EINVAL;
1225         }
1226
1227         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
1228         priv->stations[sta_id].used |= IWL_STA_BCAST;
1229         spin_unlock_irqrestore(&priv->sta_lock, flags);
1230
1231         if (init_lq) {
1232                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
1233                 if (!link_cmd) {
1234                         IWL_ERR(priv,
1235                                 "Unable to initialize rate scaling for bcast station.\n");
1236                         return -ENOMEM;
1237                 }
1238
1239                 spin_lock_irqsave(&priv->sta_lock, flags);
1240                 priv->stations[sta_id].lq = link_cmd;
1241                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1242         }
1243
1244         return 0;
1245 }
1246 EXPORT_SYMBOL_GPL(iwl_alloc_bcast_station);
1247
1248 void iwl_dealloc_bcast_station(struct iwl_priv *priv)
1249 {
1250         unsigned long flags;
1251         int i;
1252
1253         spin_lock_irqsave(&priv->sta_lock, flags);
1254         for (i = 0; i < priv->hw_params.max_stations; i++) {
1255                 if (!(priv->stations[i].used & IWL_STA_BCAST))
1256                         continue;
1257
1258                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
1259                 priv->num_stations--;
1260                 BUG_ON(priv->num_stations < 0);
1261                 kfree(priv->stations[i].lq);
1262                 priv->stations[i].lq = NULL;
1263         }
1264         spin_unlock_irqrestore(&priv->sta_lock, flags);
1265 }
1266 EXPORT_SYMBOL_GPL(iwl_dealloc_bcast_station);
1267
1268 /**
1269  * iwl_sta_tx_modify_enable_tid - Enable Tx for this TID in station table
1270  */
1271 void iwl_sta_tx_modify_enable_tid(struct iwl_priv *priv, int sta_id, int tid)
1272 {
1273         unsigned long flags;
1274
1275         /* Remove "disable" flag, to enable Tx for this TID */
1276         spin_lock_irqsave(&priv->sta_lock, flags);
1277         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
1278         priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
1279         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1280         spin_unlock_irqrestore(&priv->sta_lock, flags);
1281
1282         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1283 }
1284 EXPORT_SYMBOL(iwl_sta_tx_modify_enable_tid);
1285
1286 int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
1287                          int tid, u16 ssn)
1288 {
1289         unsigned long flags;
1290         int sta_id;
1291
1292         sta_id = iwl_sta_id(sta);
1293         if (sta_id == IWL_INVALID_STATION)
1294                 return -ENXIO;
1295
1296         spin_lock_irqsave(&priv->sta_lock, flags);
1297         priv->stations[sta_id].sta.station_flags_msk = 0;
1298         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
1299         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
1300         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
1301         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1302         spin_unlock_irqrestore(&priv->sta_lock, flags);
1303
1304         return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
1305                                 CMD_ASYNC);
1306 }
1307 EXPORT_SYMBOL(iwl_sta_rx_agg_start);
1308
1309 int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
1310                         int tid)
1311 {
1312         unsigned long flags;
1313         int sta_id;
1314
1315         sta_id = iwl_sta_id(sta);
1316         if (sta_id == IWL_INVALID_STATION) {
1317                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1318                 return -ENXIO;
1319         }
1320
1321         spin_lock_irqsave(&priv->sta_lock, flags);
1322         priv->stations[sta_id].sta.station_flags_msk = 0;
1323         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
1324         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
1325         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1326         spin_unlock_irqrestore(&priv->sta_lock, flags);
1327
1328         return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
1329                                         CMD_ASYNC);
1330 }
1331 EXPORT_SYMBOL(iwl_sta_rx_agg_stop);
1332
1333 void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
1334 {
1335         unsigned long flags;
1336
1337         spin_lock_irqsave(&priv->sta_lock, flags);
1338         priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
1339         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1340         priv->stations[sta_id].sta.sta.modify_mask = 0;
1341         priv->stations[sta_id].sta.sleep_tx_count = 0;
1342         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1343         spin_unlock_irqrestore(&priv->sta_lock, flags);
1344
1345         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1346 }
1347 EXPORT_SYMBOL(iwl_sta_modify_ps_wake);
1348
1349 void iwl_sta_modify_sleep_tx_count(struct iwl_priv *priv, int sta_id, int cnt)
1350 {
1351         unsigned long flags;
1352
1353         spin_lock_irqsave(&priv->sta_lock, flags);
1354         priv->stations[sta_id].sta.station_flags |= STA_FLG_PWR_SAVE_MSK;
1355         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1356         priv->stations[sta_id].sta.sta.modify_mask =
1357                                         STA_MODIFY_SLEEP_TX_COUNT_MSK;
1358         priv->stations[sta_id].sta.sleep_tx_count = cpu_to_le16(cnt);
1359         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1360         spin_unlock_irqrestore(&priv->sta_lock, flags);
1361
1362         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1363 }
1364 EXPORT_SYMBOL(iwl_sta_modify_sleep_tx_count);
1365
1366 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
1367                        struct ieee80211_vif *vif,
1368                        struct ieee80211_sta *sta)
1369 {
1370         struct iwl_priv *priv = hw->priv;
1371         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
1372         int ret;
1373
1374         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
1375                         sta->addr);
1376         ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
1377         if (ret)
1378                 IWL_ERR(priv, "Error removing station %pM\n",
1379                         sta->addr);
1380         return ret;
1381 }
1382 EXPORT_SYMBOL(iwl_mac_sta_remove);