SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         /* BCAST station and IBSS stations do not work in HT mode */
 288         if (sta_id != priv->hw_params.bcast_sta_id &&
 289             priv->iw_mode != NL80211_IFTYPE_ADHOC)
 290                 iwl_set_ht_add_station(priv, sta_id, ht_info);
 291
 292         /* 3945 only */
 293         rate = (priv->band == IEEE80211_BAND_5GHZ) ?
 294                 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
 295         /* Turn on both antennas for the station... */
 296         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 297
 298         return sta_id;
 299
 300 }
 301
 302 #define STA_WAIT_TIMEOUT (HZ/2)
 303
 304 /**
 305  * iwl_add_station_common -
 306  */
 307 int iwl_add_station_common(struct iwl_priv *priv, const u8 *addr,
 308                                   bool is_ap,
 309                                   struct ieee80211_sta_ht_cap *ht_info,
 310                                   u8 *sta_id_r)
 311 {
 312         struct iwl_station_entry *station;
 313         unsigned long flags_spin;
 314         int ret = 0;
 315         u8 sta_id;
 316
 317         *sta_id_r = 0;
 318         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 319         sta_id = iwl_prep_station(priv, addr, is_ap, ht_info);
 320         if (sta_id == IWL_INVALID_STATION) {
 321                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 322                         addr);
 323                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 324                 return -EINVAL;
 325         }
 326
 327         /*
 328          * uCode is not able to deal with multiple requests to add a
 329          * station. Keep track if one is in progress so that we do not send
 330          * another.
 331          */
 332         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 333                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 334                                sta_id);
 335                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 336                 return -EEXIST;
 337         }
 338
 339         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 340             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 341                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 342                                 sta_id, addr);
 343                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 344                 return -EEXIST;
 345         }
 346
 347         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 348         station = &priv->stations[sta_id];
 349         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 350
 351         /* Add station to device's station table */
 352         ret = iwl_send_add_sta(priv, &station->sta, CMD_SYNC);
 353         if (ret) {
 354                 IWL_ERR(priv, "Adding station %pM failed.\n", station->sta.sta.addr);
 355                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 356                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 357                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 358                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 359         }
 360         *sta_id_r = sta_id;
 361         return ret;
 362 }
 363 EXPORT_SYMBOL(iwl_add_station_common);
 364
 365 static struct iwl_link_quality_cmd *iwl_sta_alloc_lq(struct iwl_priv *priv,
 366                                                      u8 sta_id)
 367 {
 368         int i, r;
 369         struct iwl_link_quality_cmd *link_cmd;
 370         u32 rate_flags;
 371
 372         link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
 373         if (!link_cmd) {
 374                 IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
 375                 return NULL;
 376         }
 377         /* Set up the rate scaling to start at selected rate, fall back
 378          * all the way down to 1M in IEEE order, and then spin on 1M */
 379         if (priv->band == IEEE80211_BAND_5GHZ)
 380                 r = IWL_RATE_6M_INDEX;
 381         else
 382                 r = IWL_RATE_1M_INDEX;
 383
 384         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 385                 rate_flags = 0;
 386                 if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
 387                         rate_flags |= RATE_MCS_CCK_MSK;
 388
 389                 rate_flags |= first_antenna(priv->hw_params.valid_tx_ant) <<
 390                                 RATE_MCS_ANT_POS;
 391
 392                 link_cmd->rs_table[i].rate_n_flags =
 393                         iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
 394                 r = iwl_get_prev_ieee_rate(r);
 395         }
 396
 397         link_cmd->general_params.single_stream_ant_msk =
 398                                 first_antenna(priv->hw_params.valid_tx_ant);
 399
 400         link_cmd->general_params.dual_stream_ant_msk =
 401                 priv->hw_params.valid_tx_ant &
 402                 ~first_antenna(priv->hw_params.valid_tx_ant);
 403         if (!link_cmd->general_params.dual_stream_ant_msk) {
 404                 link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
 405         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
 406                 link_cmd->general_params.dual_stream_ant_msk =
 407                         priv->hw_params.valid_tx_ant;
 408         }
 409
 410         link_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
 411         link_cmd->agg_params.agg_time_limit =
 412                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
 413
 414         link_cmd->sta_id = sta_id;
 415
 416         return link_cmd;
 417 }
 418
 419 /*
 420  * iwl_add_bssid_station - Add the special IBSS BSSID station
 421  *
 422  * Function sleeps.
 423  */
 424 int iwl_add_bssid_station(struct iwl_priv *priv, const u8 *addr, bool init_rs,
 425                           u8 *sta_id_r)
 426 {
 427         int ret;
 428         u8 sta_id;
 429         struct iwl_link_quality_cmd *link_cmd;
 430         unsigned long flags;
 431
 432         if (*sta_id_r)
 433                 *sta_id_r = IWL_INVALID_STATION;
 434
 435         ret = iwl_add_station_common(priv, addr, 0, NULL, &sta_id);
 436         if (ret) {
 437                 IWL_ERR(priv, "Unable to add station %pM\n", addr);
 438                 return ret;
 439         }
 440
 441         if (sta_id_r)
 442                 *sta_id_r = sta_id;
 443
 444         spin_lock_irqsave(&priv->sta_lock, flags);
 445         priv->stations[sta_id].used |= IWL_STA_LOCAL;
 446         spin_unlock_irqrestore(&priv->sta_lock, flags);
 447
 448         if (init_rs) {
 449                 /* Set up default rate scaling table in device's station table */
 450                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
 451                 if (!link_cmd) {
 452                         IWL_ERR(priv, "Unable to initialize rate scaling for station %pM.\n",
 453                                 addr);
 454                         return -ENOMEM;
 455                 }
 456
 457                 ret = iwl_send_lq_cmd(priv, link_cmd, CMD_SYNC, true);
 458                 if (ret)
 459                         IWL_ERR(priv, "Link quality command failed (%d)\n", ret);
 460
 461                 spin_lock_irqsave(&priv->sta_lock, flags);
 462                 priv->stations[sta_id].lq = link_cmd;
 463                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 464         }
 465
 466         return 0;
 467 }
 468 EXPORT_SYMBOL(iwl_add_bssid_station);
 469
 470 /**
 471  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 472  *
 473  * priv->sta_lock must be held
 474  */
 475 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 476 {
 477         /* Ucode must be active and driver must be non active */
 478         if ((priv->stations[sta_id].used &
 479              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 480                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 481
 482         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 483
 484         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 485         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 486 }
 487
 488 static int iwl_send_remove_station(struct iwl_priv *priv,
 489                                    struct iwl_station_entry *station)
 490 {
 491         struct iwl_rx_packet *pkt;
 492         int ret;
 493
 494         unsigned long flags_spin;
 495         struct iwl_rem_sta_cmd rm_sta_cmd;
 496
 497         struct iwl_host_cmd cmd = {
 498                 .id = REPLY_REMOVE_STA,
 499                 .len = sizeof(struct iwl_rem_sta_cmd),
 500                 .flags = CMD_SYNC,
 501                 .data = &rm_sta_cmd,
 502         };
 503
 504         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 505         rm_sta_cmd.num_sta = 1;
 506         memcpy(&rm_sta_cmd.addr, &station->sta.sta.addr , ETH_ALEN);
 507
 508         cmd.flags |= CMD_WANT_SKB;
 509
 510         ret = iwl_send_cmd(priv, &cmd);
 511
 512         if (ret)
 513                 return ret;
 514
 515         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 516         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 517                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 518                           pkt->hdr.flags);
 519                 ret = -EIO;
 520         }
 521
 522         if (!ret) {
 523                 switch (pkt->u.rem_sta.status) {
 524                 case REM_STA_SUCCESS_MSK:
 525                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 526                         iwl_sta_ucode_deactivate(priv, station->sta.sta.sta_id);
 527                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 528                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 529                         break;
 530                 default:
 531                         ret = -EIO;
 532                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 533                         break;
 534                 }
 535         }
 536         iwl_free_pages(priv, cmd.reply_page);
 537
 538         return ret;
 539 }
 540
 541 /**
 542  * iwl_remove_station - Remove driver's knowledge of station.
 543  */
 544 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 545                        const u8 *addr)
 546 {
 547         struct iwl_station_entry *station;
 548         unsigned long flags;
 549
 550         if (!iwl_is_ready(priv)) {
 551                 IWL_DEBUG_INFO(priv,
 552                         "Unable to remove station %pM, device not ready.\n",
 553                         addr);
 554                 /*
 555                  * It is typical for stations to be removed when we are
 556                  * going down. Return success since device will be down
 557                  * soon anyway
 558                  */
 559                 return 0;
 560         }
 561
 562         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 563                         sta_id, addr);
 564
 565         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 566                 return -EINVAL;
 567
 568         spin_lock_irqsave(&priv->sta_lock, flags);
 569
 570         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 571                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 572                                 addr);
 573                 goto out_err;
 574         }
 575
 576         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 577                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 578                                 addr);
 579                 goto out_err;
 580         }
 581
 582         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 583                 kfree(priv->stations[sta_id].lq);
 584                 priv->stations[sta_id].lq = NULL;
 585         }
 586
 587         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 588
 589         priv->num_stations--;
 590
 591         BUG_ON(priv->num_stations < 0);
 592
 593         station = &priv->stations[sta_id];
 594         spin_unlock_irqrestore(&priv->sta_lock, flags);
 595
 596         return iwl_send_remove_station(priv, station);
 597 out_err:
 598         spin_unlock_irqrestore(&priv->sta_lock, flags);
 599         return -EINVAL;
 600 }
 601 EXPORT_SYMBOL_GPL(iwl_remove_station);
 602
 603 /**
 604  * iwl_clear_ucode_stations - clear ucode station table bits
 605  *
 606  * This function clears all the bits in the driver indicating
 607  * which stations are active in the ucode. Call when something
 608  * other than explicit station management would cause this in
 609  * the ucode, e.g. unassociated RXON.
 610  */
 611 void iwl_clear_ucode_stations(struct iwl_priv *priv)
 612 {
 613         int i;
 614         unsigned long flags_spin;
 615         bool cleared = false;
 616
 617         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 618
 619         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 620         for (i = 0; i < priv->hw_params.max_stations; i++) {
 621                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 622                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 623                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 624                         cleared = true;
 625                 }
 626         }
 627         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 628
 629         if (!cleared)
 630                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 631 }
 632 EXPORT_SYMBOL(iwl_clear_ucode_stations);
 633
 634 /**
 635  * iwl_restore_stations() - Restore driver known stations to device
 636  *
 637  * All stations considered active by driver, but not present in ucode, is
 638  * restored.
 639  *
 640  * Function sleeps.
 641  */
 642 void iwl_restore_stations(struct iwl_priv *priv)
 643 {
 644         struct iwl_station_entry *station;
 645         unsigned long flags_spin;
 646         int i;
 647         bool found = false;
 648         int ret;
 649
 650         if (!iwl_is_ready(priv)) {
 651                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 652                 return;
 653         }
 654
 655         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 656         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 657         for (i = 0; i < priv->hw_params.max_stations; i++) {
 658                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 659                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 660                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 661                                         priv->stations[i].sta.sta.addr);
 662                         priv->stations[i].sta.mode = 0;
 663                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 664                         found = true;
 665                 }
 666         }
 667
 668         for (i = 0; i < priv->hw_params.max_stations; i++) {
 669                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 670                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 671                         station = &priv->stations[i];
 672                         ret = iwl_send_add_sta(priv, &priv->stations[i].sta, CMD_SYNC);
 673                         if (ret) {
 674                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 675                                         station->sta.sta.addr);
 676                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 677                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 678                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 679                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 680                         }
 681                         /*
 682                          * Rate scaling has already been initialized, send
 683                          * current LQ command
 684                          */
 685                         if (station->lq)
 686                                 iwl_send_lq_cmd(priv, station->lq, CMD_SYNC, true);
 687                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 688                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 689                 }
 690         }
 691
 692         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 693         if (!found)
 694                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 695         else
 696                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 697 }
 698 EXPORT_SYMBOL(iwl_restore_stations);
 699
 700 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
 701 {
 702         int i;
 703
 704         for (i = 0; i < STA_KEY_MAX_NUM; i++)
 705                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 706                         return i;
 707
 708         return WEP_INVALID_OFFSET;
 709 }
 710 EXPORT_SYMBOL(iwl_get_free_ucode_key_index);
 711
 712 static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
 713 {
 714         int i, not_empty = 0;
 715         u8 buff[sizeof(struct iwl_wep_cmd) +
 716                 sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
 717         struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
 718         size_t cmd_size  = sizeof(struct iwl_wep_cmd);
 719         struct iwl_host_cmd cmd = {
 720                 .id = REPLY_WEPKEY,
 721                 .data = wep_cmd,
 722                 .flags = CMD_SYNC,
 723         };
 724
 725         might_sleep();
 726
 727         memset(wep_cmd, 0, cmd_size +
 728                         (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 729
 730         for (i = 0; i < WEP_KEYS_MAX ; i++) {
 731                 wep_cmd->key[i].key_index = i;
 732                 if (priv->wep_keys[i].key_size) {
 733                         wep_cmd->key[i].key_offset = i;
 734                         not_empty = 1;
 735                 } else {
 736                         wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
 737                 }
 738
 739                 wep_cmd->key[i].key_size = priv->wep_keys[i].key_size;
 740                 memcpy(&wep_cmd->key[i].key[3], priv->wep_keys[i].key,
 741                                 priv->wep_keys[i].key_size);
 742         }
 743
 744         wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
 745         wep_cmd->num_keys = WEP_KEYS_MAX;
 746
 747         cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
 748
 749         cmd.len = cmd_size;
 750
 751         if (not_empty || send_if_empty)
 752                 return iwl_send_cmd(priv, &cmd);
 753         else
 754                 return 0;
 755 }
 756
 757 int iwl_restore_default_wep_keys(struct iwl_priv *priv)
 758 {
 759         WARN_ON(!mutex_is_locked(&priv->mutex));
 760
 761         return iwl_send_static_wepkey_cmd(priv, 0);
 762 }
 763 EXPORT_SYMBOL(iwl_restore_default_wep_keys);
 764
 765 int iwl_remove_default_wep_key(struct iwl_priv *priv,
 766                                struct ieee80211_key_conf *keyconf)
 767 {
 768         int ret;
 769
 770         WARN_ON(!mutex_is_locked(&priv->mutex));
 771
 772         IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
 773                       keyconf->keyidx);
 774
 775         memset(&priv->wep_keys[keyconf->keyidx], 0, sizeof(priv->wep_keys[0]));
 776         if (iwl_is_rfkill(priv)) {
 777                 IWL_DEBUG_WEP(priv, "Not sending REPLY_WEPKEY command due to RFKILL.\n");
 778                 /* but keys in device are clear anyway so return success */
 779                 return 0;
 780         }
 781         ret = iwl_send_static_wepkey_cmd(priv, 1);
 782         IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
 783                       keyconf->keyidx, ret);
 784
 785         return ret;
 786 }
 787 EXPORT_SYMBOL(iwl_remove_default_wep_key);
 788
 789 int iwl_set_default_wep_key(struct iwl_priv *priv,
 790                             struct ieee80211_key_conf *keyconf)
 791 {
 792         int ret;
 793
 794         WARN_ON(!mutex_is_locked(&priv->mutex));
 795
 796         if (keyconf->keylen != WEP_KEY_LEN_128 &&
 797             keyconf->keylen != WEP_KEY_LEN_64) {
 798                 IWL_DEBUG_WEP(priv, "Bad WEP key length %d\n", keyconf->keylen);
 799                 return -EINVAL;
 800         }
 801
 802         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 803         keyconf->hw_key_idx = HW_KEY_DEFAULT;
 804         priv->stations[IWL_AP_ID].keyinfo.alg = ALG_WEP;
 805
 806         priv->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
 807         memcpy(&priv->wep_keys[keyconf->keyidx].key, &keyconf->key,
 808                                                         keyconf->keylen);
 809
 810         ret = iwl_send_static_wepkey_cmd(priv, 0);
 811         IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
 812                 keyconf->keylen, keyconf->keyidx, ret);
 813
 814         return ret;
 815 }
 816 EXPORT_SYMBOL(iwl_set_default_wep_key);
 817
 818 static int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
 819                                 struct ieee80211_key_conf *keyconf,
 820                                 u8 sta_id)
 821 {
 822         unsigned long flags;
 823         __le16 key_flags = 0;
 824         int ret;
 825
 826         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 827
 828         key_flags |= (STA_KEY_FLG_WEP | STA_KEY_FLG_MAP_KEY_MSK);
 829         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 830         key_flags &= ~STA_KEY_FLG_INVALID;
 831
 832         if (keyconf->keylen == WEP_KEY_LEN_128)
 833                 key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
 834
 835         if (sta_id == priv->hw_params.bcast_sta_id)
 836                 key_flags |= STA_KEY_MULTICAST_MSK;
 837
 838         spin_lock_irqsave(&priv->sta_lock, flags);
 839
 840         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 841         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 842         priv->stations[sta_id].keyinfo.keyidx = keyconf->keyidx;
 843
 844         memcpy(priv->stations[sta_id].keyinfo.key,
 845                                 keyconf->key, keyconf->keylen);
 846
 847         memcpy(&priv->stations[sta_id].sta.key.key[3],
 848                                 keyconf->key, keyconf->keylen);
 849
 850         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 851                         == STA_KEY_FLG_NO_ENC)
 852                 priv->stations[sta_id].sta.key.key_offset =
 853                                  iwl_get_free_ucode_key_index(priv);
 854         /* else, we are overriding an existing key => no need to allocated room
 855          * in uCode. */
 856
 857         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 858                 "no space for a new key");
 859
 860         priv->stations[sta_id].sta.key.key_flags = key_flags;
 861         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 862         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 863
 864         ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
 865
 866         spin_unlock_irqrestore(&priv->sta_lock, flags);
 867
 868         return ret;
 869 }
 870
 871 static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
 872                                    struct ieee80211_key_conf *keyconf,
 873                                    u8 sta_id)
 874 {
 875         unsigned long flags;
 876         __le16 key_flags = 0;
 877         int ret;
 878
 879         key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
 880         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 881         key_flags &= ~STA_KEY_FLG_INVALID;
 882
 883         if (sta_id == priv->hw_params.bcast_sta_id)
 884                 key_flags |= STA_KEY_MULTICAST_MSK;
 885
 886         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 887
 888         spin_lock_irqsave(&priv->sta_lock, flags);
 889         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 890         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 891
 892         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
 893                keyconf->keylen);
 894
 895         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
 896                keyconf->keylen);
 897
 898         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 899                         == STA_KEY_FLG_NO_ENC)
 900                 priv->stations[sta_id].sta.key.key_offset =
 901                                  iwl_get_free_ucode_key_index(priv);
 902         /* else, we are overriding an existing key => no need to allocated room
 903          * in uCode. */
 904
 905         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 906                 "no space for a new key");
 907
 908         priv->stations[sta_id].sta.key.key_flags = key_flags;
 909         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 910         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 911
 912         ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
 913
 914         spin_unlock_irqrestore(&priv->sta_lock, flags);
 915
 916         return ret;
 917 }
 918
 919 static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
 920                                    struct ieee80211_key_conf *keyconf,
 921                                    u8 sta_id)
 922 {
 923         unsigned long flags;
 924         int ret = 0;
 925         __le16 key_flags = 0;
 926
 927         key_flags |= (STA_KEY_FLG_TKIP | STA_KEY_FLG_MAP_KEY_MSK);
 928         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 929         key_flags &= ~STA_KEY_FLG_INVALID;
 930
 931         if (sta_id == priv->hw_params.bcast_sta_id)
 932                 key_flags |= STA_KEY_MULTICAST_MSK;
 933
 934         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 935         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 936
 937         spin_lock_irqsave(&priv->sta_lock, flags);
 938
 939         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 940         priv->stations[sta_id].keyinfo.keylen = 16;
 941
 942         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 943                         == STA_KEY_FLG_NO_ENC)
 944                 priv->stations[sta_id].sta.key.key_offset =
 945                                  iwl_get_free_ucode_key_index(priv);
 946         /* else, we are overriding an existing key => no need to allocated room
 947          * in uCode. */
 948
 949         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 950                 "no space for a new key");
 951
 952         priv->stations[sta_id].sta.key.key_flags = key_flags;
 953
 954
 955         /* This copy is acutally not needed: we get the key with each TX */
 956         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key, 16);
 957
 958         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key, 16);
 959
 960         spin_unlock_irqrestore(&priv->sta_lock, flags);
 961
 962         return ret;
 963 }
 964
 965 void iwl_update_tkip_key(struct iwl_priv *priv,
 966                         struct ieee80211_key_conf *keyconf,
 967                         struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
 968 {
 969         u8 sta_id;
 970         unsigned long flags;
 971         int i;
 972
 973         if (sta) {
 974                 sta_id = iwl_sta_id(sta);
 975
 976                 if (sta_id == IWL_INVALID_STATION) {
 977                         IWL_DEBUG_MAC80211(priv, "leave - %pM not initialised.\n",
 978                                            sta->addr);
 979                         return;
 980                 }
 981         } else
 982                 sta_id = priv->hw_params.bcast_sta_id;
 983
 984
 985         if (iwl_scan_cancel(priv)) {
 986                 /* cancel scan failed, just live w/ bad key and rely
 987                    briefly on SW decryption */
 988                 return;
 989         }
 990
 991         spin_lock_irqsave(&priv->sta_lock, flags);
 992
 993         priv->stations[sta_id].sta.key.tkip_rx_tsc_byte2 = (u8) iv32;
 994
 995         for (i = 0; i < 5; i++)
 996                 priv->stations[sta_id].sta.key.tkip_rx_ttak[i] =
 997                         cpu_to_le16(phase1key[i]);
 998
 999         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
1000         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1001
1002         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1003
1004         spin_unlock_irqrestore(&priv->sta_lock, flags);
1005
1006 }
1007 EXPORT_SYMBOL(iwl_update_tkip_key);
1008
1009 int iwl_remove_dynamic_key(struct iwl_priv *priv,
1010                                 struct ieee80211_key_conf *keyconf,
1011                                 u8 sta_id)
1012 {
1013         unsigned long flags;
1014         int ret = 0;
1015         u16 key_flags;
1016         u8 keyidx;
1017
1018         priv->key_mapping_key--;
1019
1020         spin_lock_irqsave(&priv->sta_lock, flags);
1021         key_flags = le16_to_cpu(priv->stations[sta_id].sta.key.key_flags);
1022         keyidx = (key_flags >> STA_KEY_FLG_KEYID_POS) & 0x3;
1023
1024         IWL_DEBUG_WEP(priv, "Remove dynamic key: idx=%d sta=%d\n",
1025                       keyconf->keyidx, sta_id);
1026
1027         if (keyconf->keyidx != keyidx) {
1028                 /* We need to remove a key with index different that the one
1029                  * in the uCode. This means that the key we need to remove has
1030                  * been replaced by another one with different index.
1031                  * Don't do anything and return ok
1032                  */
1033                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1034                 return 0;
1035         }
1036
1037         if (priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET) {
1038                 IWL_WARN(priv, "Removing wrong key %d 0x%x\n",
1039                             keyconf->keyidx, key_flags);
1040                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1041                 return 0;
1042         }
1043
1044         if (!test_and_clear_bit(priv->stations[sta_id].sta.key.key_offset,
1045                 &priv->ucode_key_table))
1046                 IWL_ERR(priv, "index %d not used in uCode key table.\n",
1047                         priv->stations[sta_id].sta.key.key_offset);
1048         memset(&priv->stations[sta_id].keyinfo, 0,
1049                                         sizeof(struct iwl_hw_key));
1050         memset(&priv->stations[sta_id].sta.key, 0,
1051                                         sizeof(struct iwl4965_keyinfo));
1052         priv->stations[sta_id].sta.key.key_flags =
1053                         STA_KEY_FLG_NO_ENC | STA_KEY_FLG_INVALID;
1054         priv->stations[sta_id].sta.key.key_offset = WEP_INVALID_OFFSET;
1055         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
1056         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1057
1058         if (iwl_is_rfkill(priv)) {
1059                 IWL_DEBUG_WEP(priv, "Not sending REPLY_ADD_STA command because RFKILL enabled.\n");
1060                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1061                 return 0;
1062         }
1063         ret =  iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1064         spin_unlock_irqrestore(&priv->sta_lock, flags);
1065         return ret;
1066 }
1067 EXPORT_SYMBOL(iwl_remove_dynamic_key);
1068
1069 int iwl_set_dynamic_key(struct iwl_priv *priv,
1070                                 struct ieee80211_key_conf *keyconf, u8 sta_id)
1071 {
1072         int ret;
1073
1074         priv->key_mapping_key++;
1075         keyconf->hw_key_idx = HW_KEY_DYNAMIC;
1076
1077         switch (keyconf->alg) {
1078         case ALG_CCMP:
1079                 ret = iwl_set_ccmp_dynamic_key_info(priv, keyconf, sta_id);
1080                 break;
1081         case ALG_TKIP:
1082                 ret = iwl_set_tkip_dynamic_key_info(priv, keyconf, sta_id);
1083                 break;
1084         case ALG_WEP:
1085                 ret = iwl_set_wep_dynamic_key_info(priv, keyconf, sta_id);
1086                 break;
1087         default:
1088                 IWL_ERR(priv,
1089                         "Unknown alg: %s alg = %d\n", __func__, keyconf->alg);
1090                 ret = -EINVAL;
1091         }
1092
1093         IWL_DEBUG_WEP(priv, "Set dynamic key: alg= %d len=%d idx=%d sta=%d ret=%d\n",
1094                       keyconf->alg, keyconf->keylen, keyconf->keyidx,
1095                       sta_id, ret);
1096
1097         return ret;
1098 }
1099 EXPORT_SYMBOL(iwl_set_dynamic_key);
1100
1101 #ifdef CONFIG_IWLWIFI_DEBUG
1102 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
1103                            struct iwl_link_quality_cmd *lq)
1104 {
1105         int i;
1106         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
1107         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
1108                        lq->general_params.single_stream_ant_msk,
1109                        lq->general_params.dual_stream_ant_msk);
1110
1111         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
1112                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
1113                                i, lq->rs_table[i].rate_n_flags);
1114 }
1115 #else
1116 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
1117                                    struct iwl_link_quality_cmd *lq)
1118 {
1119 }
1120 #endif
1121
1122 /**
1123  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
1124  *
1125  * It sometimes happens when a HT rate has been in use and we
1126  * loose connectivity with AP then mac80211 will first tell us that the
1127  * current channel is not HT anymore before removing the station. In such a
1128  * scenario the RXON flags will be updated to indicate we are not
1129  * communicating HT anymore, but the LQ command may still contain HT rates.
1130  * Test for this to prevent driver from sending LQ command between the time
1131  * RXON flags are updated and when LQ command is updated.
1132  */
1133 static bool is_lq_table_valid(struct iwl_priv *priv,
1134                               struct iwl_link_quality_cmd *lq)
1135 {
1136         int i;
1137         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
1138
1139         if (ht_conf->is_ht)
1140                 return true;
1141
1142         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
1143                        priv->active_rxon.channel);
1144         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
1145                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
1146                         IWL_DEBUG_INFO(priv,
1147                                        "index %d of LQ expects HT channel\n",
1148                                        i);
1149                         return false;
1150                 }
1151         }
1152         return true;
1153 }
1154
1155 /**
1156  * iwl_send_lq_cmd() - Send link quality command
1157  * @init: This command is sent as part of station initialization right
1158  *        after station has been added.
1159  *
1160  * The link quality command is sent as the last step of station creation.
1161  * This is the special case in which init is set and we call a callback in
1162  * this case to clear the state indicating that station creation is in
1163  * progress.
1164  */
1165 int iwl_send_lq_cmd(struct iwl_priv *priv,
1166                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
1167 {
1168         int ret = 0;
1169         unsigned long flags_spin;
1170
1171         struct iwl_host_cmd cmd = {
1172                 .id = REPLY_TX_LINK_QUALITY_CMD,
1173                 .len = sizeof(struct iwl_link_quality_cmd),
1174                 .flags = flags,
1175                 .data = lq,
1176         };
1177
1178         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
1179                 return -EINVAL;
1180
1181         iwl_dump_lq_cmd(priv, lq);
1182         BUG_ON(init && (cmd.flags & CMD_ASYNC));
1183
1184         if (is_lq_table_valid(priv, lq))
1185                 ret = iwl_send_cmd(priv, &cmd);
1186         else
1187                 ret = -EINVAL;
1188
1189         if (cmd.flags & CMD_ASYNC)
1190                 return ret;
1191
1192         if (init) {
1193                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
1194                                lq->sta_id);
1195                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
1196                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
1197                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
1198         }
1199         return ret;
1200 }
1201 EXPORT_SYMBOL(iwl_send_lq_cmd);
1202
1203 /**
1204  * iwl_alloc_bcast_station - add broadcast station into driver's station table.
1205  *
1206  * This adds the broadcast station into the driver's station table
1207  * and marks it driver active, so that it will be restored to the
1208  * device at the next best time.
1209  */
1210 int iwl_alloc_bcast_station(struct iwl_priv *priv, bool init_lq)
1211 {
1212         struct iwl_link_quality_cmd *link_cmd;
1213         unsigned long flags;
1214         u8 sta_id;
1215
1216         spin_lock_irqsave(&priv->sta_lock, flags);
1217         sta_id = iwl_prep_station(priv, iwl_bcast_addr, false, NULL);
1218         if (sta_id == IWL_INVALID_STATION) {
1219                 IWL_ERR(priv, "Unable to prepare broadcast station\n");
1220                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1221
1222                 return -EINVAL;
1223         }
1224
1225         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
1226         priv->stations[sta_id].used |= IWL_STA_BCAST;
1227         spin_unlock_irqrestore(&priv->sta_lock, flags);
1228
1229         if (init_lq) {
1230                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
1231                 if (!link_cmd) {
1232                         IWL_ERR(priv,
1233                                 "Unable to initialize rate scaling for bcast station.\n");
1234                         return -ENOMEM;
1235                 }
1236
1237                 spin_lock_irqsave(&priv->sta_lock, flags);
1238                 priv->stations[sta_id].lq = link_cmd;
1239                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1240         }
1241
1242         return 0;
1243 }
1244 EXPORT_SYMBOL_GPL(iwl_alloc_bcast_station);
1245
1246 void iwl_dealloc_bcast_station(struct iwl_priv *priv)
1247 {
1248         unsigned long flags;
1249         int i;
1250
1251         spin_lock_irqsave(&priv->sta_lock, flags);
1252         for (i = 0; i < priv->hw_params.max_stations; i++) {
1253                 if (!(priv->stations[i].used & IWL_STA_BCAST))
1254                         continue;
1255
1256                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
1257                 priv->num_stations--;
1258                 BUG_ON(priv->num_stations < 0);
1259                 kfree(priv->stations[i].lq);
1260                 priv->stations[i].lq = NULL;
1261         }
1262         spin_unlock_irqrestore(&priv->sta_lock, flags);
1263 }
1264 EXPORT_SYMBOL_GPL(iwl_dealloc_bcast_station);
1265
1266 /**
1267  * iwl_sta_tx_modify_enable_tid - Enable Tx for this TID in station table
1268  */
1269 void iwl_sta_tx_modify_enable_tid(struct iwl_priv *priv, int sta_id, int tid)
1270 {
1271         unsigned long flags;
1272
1273         /* Remove "disable" flag, to enable Tx for this TID */
1274         spin_lock_irqsave(&priv->sta_lock, flags);
1275         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
1276         priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
1277         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1278         spin_unlock_irqrestore(&priv->sta_lock, flags);
1279
1280         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1281 }
1282 EXPORT_SYMBOL(iwl_sta_tx_modify_enable_tid);
1283
1284 int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
1285                          int tid, u16 ssn)
1286 {
1287         unsigned long flags;
1288         int sta_id;
1289
1290         sta_id = iwl_sta_id(sta);
1291         if (sta_id == IWL_INVALID_STATION)
1292                 return -ENXIO;
1293
1294         spin_lock_irqsave(&priv->sta_lock, flags);
1295         priv->stations[sta_id].sta.station_flags_msk = 0;
1296         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
1297         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
1298         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
1299         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1300         spin_unlock_irqrestore(&priv->sta_lock, flags);
1301
1302         return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
1303                                 CMD_ASYNC);
1304 }
1305 EXPORT_SYMBOL(iwl_sta_rx_agg_start);
1306
1307 int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
1308                         int tid)
1309 {
1310         unsigned long flags;
1311         int sta_id;
1312
1313         sta_id = iwl_sta_id(sta);
1314         if (sta_id == IWL_INVALID_STATION) {
1315                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1316                 return -ENXIO;
1317         }
1318
1319         spin_lock_irqsave(&priv->sta_lock, flags);
1320         priv->stations[sta_id].sta.station_flags_msk = 0;
1321         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
1322         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
1323         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1324         spin_unlock_irqrestore(&priv->sta_lock, flags);
1325
1326         return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
1327                                         CMD_ASYNC);
1328 }
1329 EXPORT_SYMBOL(iwl_sta_rx_agg_stop);
1330
1331 void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
1332 {
1333         unsigned long flags;
1334
1335         spin_lock_irqsave(&priv->sta_lock, flags);
1336         priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
1337         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1338         priv->stations[sta_id].sta.sta.modify_mask = 0;
1339         priv->stations[sta_id].sta.sleep_tx_count = 0;
1340         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1341         spin_unlock_irqrestore(&priv->sta_lock, flags);
1342
1343         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1344 }
1345 EXPORT_SYMBOL(iwl_sta_modify_ps_wake);
1346
1347 void iwl_sta_modify_sleep_tx_count(struct iwl_priv *priv, int sta_id, int cnt)
1348 {
1349         unsigned long flags;
1350
1351         spin_lock_irqsave(&priv->sta_lock, flags);
1352         priv->stations[sta_id].sta.station_flags |= STA_FLG_PWR_SAVE_MSK;
1353         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1354         priv->stations[sta_id].sta.sta.modify_mask =
1355                                         STA_MODIFY_SLEEP_TX_COUNT_MSK;
1356         priv->stations[sta_id].sta.sleep_tx_count = cpu_to_le16(cnt);
1357         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1358         spin_unlock_irqrestore(&priv->sta_lock, flags);
1359
1360         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1361 }
1362 EXPORT_SYMBOL(iwl_sta_modify_sleep_tx_count);
1363
1364 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
1365                        struct ieee80211_vif *vif,
1366                        struct ieee80211_sta *sta)
1367 {
1368         struct iwl_priv *priv = hw->priv;
1369         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
1370         int ret;
1371
1372         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
1373                         sta->addr);
1374         ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
1375         if (ret)
1376                 IWL_ERR(priv, "Error removing station %pM\n",
1377                         sta->addr);
1378         return ret;
1379 }
1380 EXPORT_SYMBOL(iwl_mac_sta_remove);