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         unsigned long flags_spin;
 315         int ret = 0;
 316         u8 sta_id;
 317         struct iwl_addsta_cmd sta_cmd;
 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         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 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, &sta_cmd, CMD_SYNC);
 355         if (ret) {
 356                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 357                 IWL_ERR(priv, "Adding station %pM failed.\n",
 358                         priv->stations[sta_id].sta.sta.addr);
 359                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 360                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 361                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 362         }
 363         *sta_id_r = sta_id;
 364         return ret;
 365 }
 366 EXPORT_SYMBOL(iwl_add_station_common);
 367
 368 static struct iwl_link_quality_cmd *iwl_sta_alloc_lq(struct iwl_priv *priv,
 369                                                      u8 sta_id)
 370 {
 371         int i, r;
 372         struct iwl_link_quality_cmd *link_cmd;
 373         u32 rate_flags;
 374
 375         link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
 376         if (!link_cmd) {
 377                 IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
 378                 return NULL;
 379         }
 380         /* Set up the rate scaling to start at selected rate, fall back
 381          * all the way down to 1M in IEEE order, and then spin on 1M */
 382         if (priv->band == IEEE80211_BAND_5GHZ)
 383                 r = IWL_RATE_6M_INDEX;
 384         else
 385                 r = IWL_RATE_1M_INDEX;
 386
 387         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 388                 rate_flags = 0;
 389                 if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
 390                         rate_flags |= RATE_MCS_CCK_MSK;
 391
 392                 rate_flags |= first_antenna(priv->hw_params.valid_tx_ant) <<
 393                                 RATE_MCS_ANT_POS;
 394
 395                 link_cmd->rs_table[i].rate_n_flags =
 396                         iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
 397                 r = iwl_get_prev_ieee_rate(r);
 398         }
 399
 400         link_cmd->general_params.single_stream_ant_msk =
 401                                 first_antenna(priv->hw_params.valid_tx_ant);
 402
 403         link_cmd->general_params.dual_stream_ant_msk =
 404                 priv->hw_params.valid_tx_ant &
 405                 ~first_antenna(priv->hw_params.valid_tx_ant);
 406         if (!link_cmd->general_params.dual_stream_ant_msk) {
 407                 link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
 408         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
 409                 link_cmd->general_params.dual_stream_ant_msk =
 410                         priv->hw_params.valid_tx_ant;
 411         }
 412
 413         link_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
 414         link_cmd->agg_params.agg_time_limit =
 415                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
 416
 417         link_cmd->sta_id = sta_id;
 418
 419         return link_cmd;
 420 }
 421
 422 /*
 423  * iwl_add_bssid_station - Add the special IBSS BSSID station
 424  *
 425  * Function sleeps.
 426  */
 427 int iwl_add_bssid_station(struct iwl_priv *priv, const u8 *addr, bool init_rs,
 428                           u8 *sta_id_r)
 429 {
 430         int ret;
 431         u8 sta_id;
 432         struct iwl_link_quality_cmd *link_cmd;
 433         unsigned long flags;
 434
 435         if (sta_id_r)
 436                 *sta_id_r = IWL_INVALID_STATION;
 437
 438         ret = iwl_add_station_common(priv, addr, 0, NULL, &sta_id);
 439         if (ret) {
 440                 IWL_ERR(priv, "Unable to add station %pM\n", addr);
 441                 return ret;
 442         }
 443
 444         if (sta_id_r)
 445                 *sta_id_r = sta_id;
 446
 447         spin_lock_irqsave(&priv->sta_lock, flags);
 448         priv->stations[sta_id].used |= IWL_STA_LOCAL;
 449         spin_unlock_irqrestore(&priv->sta_lock, flags);
 450
 451         if (init_rs) {
 452                 /* Set up default rate scaling table in device's station table */
 453                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
 454                 if (!link_cmd) {
 455                         IWL_ERR(priv, "Unable to initialize rate scaling for station %pM.\n",
 456                                 addr);
 457                         return -ENOMEM;
 458                 }
 459
 460                 ret = iwl_send_lq_cmd(priv, link_cmd, CMD_SYNC, true);
 461                 if (ret)
 462                         IWL_ERR(priv, "Link quality command failed (%d)\n", ret);
 463
 464                 spin_lock_irqsave(&priv->sta_lock, flags);
 465                 priv->stations[sta_id].lq = link_cmd;
 466                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 467         }
 468
 469         return 0;
 470 }
 471 EXPORT_SYMBOL(iwl_add_bssid_station);
 472
 473 /**
 474  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 475  *
 476  * priv->sta_lock must be held
 477  */
 478 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 479 {
 480         /* Ucode must be active and driver must be non active */
 481         if ((priv->stations[sta_id].used &
 482              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 483                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 484
 485         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 486
 487         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 488         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 489 }
 490
 491 static int iwl_send_remove_station(struct iwl_priv *priv,
 492                                    const u8 *addr, int sta_id)
 493 {
 494         struct iwl_rx_packet *pkt;
 495         int ret;
 496
 497         unsigned long flags_spin;
 498         struct iwl_rem_sta_cmd rm_sta_cmd;
 499
 500         struct iwl_host_cmd cmd = {
 501                 .id = REPLY_REMOVE_STA,
 502                 .len = sizeof(struct iwl_rem_sta_cmd),
 503                 .flags = CMD_SYNC,
 504                 .data = &rm_sta_cmd,
 505         };
 506
 507         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 508         rm_sta_cmd.num_sta = 1;
 509         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 510
 511         cmd.flags |= CMD_WANT_SKB;
 512
 513         ret = iwl_send_cmd(priv, &cmd);
 514
 515         if (ret)
 516                 return ret;
 517
 518         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 519         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 520                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 521                           pkt->hdr.flags);
 522                 ret = -EIO;
 523         }
 524
 525         if (!ret) {
 526                 switch (pkt->u.rem_sta.status) {
 527                 case REM_STA_SUCCESS_MSK:
 528                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 529                         iwl_sta_ucode_deactivate(priv, sta_id);
 530                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 531                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 532                         break;
 533                 default:
 534                         ret = -EIO;
 535                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 536                         break;
 537                 }
 538         }
 539         iwl_free_pages(priv, cmd.reply_page);
 540
 541         return ret;
 542 }
 543
 544 /**
 545  * iwl_remove_station - Remove driver's knowledge of station.
 546  */
 547 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 548                        const u8 *addr)
 549 {
 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         spin_unlock_irqrestore(&priv->sta_lock, flags);
 596
 597         return iwl_send_remove_station(priv, addr, sta_id);
 598 out_err:
 599         spin_unlock_irqrestore(&priv->sta_lock, flags);
 600         return -EINVAL;
 601 }
 602 EXPORT_SYMBOL_GPL(iwl_remove_station);
 603
 604 /**
 605  * iwl_clear_ucode_stations - clear ucode station table bits
 606  *
 607  * This function clears all the bits in the driver indicating
 608  * which stations are active in the ucode. Call when something
 609  * other than explicit station management would cause this in
 610  * the ucode, e.g. unassociated RXON.
 611  */
 612 void iwl_clear_ucode_stations(struct iwl_priv *priv)
 613 {
 614         int i;
 615         unsigned long flags_spin;
 616         bool cleared = false;
 617
 618         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 619
 620         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 621         for (i = 0; i < priv->hw_params.max_stations; i++) {
 622                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 623                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 624                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 625                         cleared = true;
 626                 }
 627         }
 628         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 629
 630         if (!cleared)
 631                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 632 }
 633 EXPORT_SYMBOL(iwl_clear_ucode_stations);
 634
 635 /**
 636  * iwl_restore_stations() - Restore driver known stations to device
 637  *
 638  * All stations considered active by driver, but not present in ucode, is
 639  * restored.
 640  *
 641  * Function sleeps.
 642  */
 643 void iwl_restore_stations(struct iwl_priv *priv)
 644 {
 645         struct iwl_addsta_cmd sta_cmd;
 646         struct iwl_link_quality_cmd lq;
 647         unsigned long flags_spin;
 648         int i;
 649         bool found = false;
 650         int ret;
 651         bool send_lq;
 652
 653         if (!iwl_is_ready(priv)) {
 654                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 655                 return;
 656         }
 657
 658         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 659         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 660         for (i = 0; i < priv->hw_params.max_stations; i++) {
 661                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 662                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 663                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 664                                         priv->stations[i].sta.sta.addr);
 665                         priv->stations[i].sta.mode = 0;
 666                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 667                         found = true;
 668                 }
 669         }
 670
 671         for (i = 0; i < priv->hw_params.max_stations; i++) {
 672                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 673                         memcpy(&sta_cmd, &priv->stations[i].sta,
 674                                sizeof(struct iwl_addsta_cmd));
 675                         send_lq = false;
 676                         if (priv->stations[i].lq) {
 677                                 memcpy(&lq, priv->stations[i].lq,
 678                                        sizeof(struct iwl_link_quality_cmd));
 679                                 send_lq = true;
 680                         }
 681                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 682                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 683                         if (ret) {
 684                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 685                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 686                                         priv->stations[i].sta.sta.addr);
 687                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 688                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 689                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 690                         }
 691                         /*
 692                          * Rate scaling has already been initialized, send
 693                          * current LQ command
 694                          */
 695                         if (send_lq)
 696                                 iwl_send_lq_cmd(priv, &lq, CMD_SYNC, true);
 697                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 698                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 699                 }
 700         }
 701
 702         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 703         if (!found)
 704                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 705         else
 706                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 707 }
 708 EXPORT_SYMBOL(iwl_restore_stations);
 709
 710 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
 711 {
 712         int i;
 713
 714         for (i = 0; i < STA_KEY_MAX_NUM; i++)
 715                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 716                         return i;
 717
 718         return WEP_INVALID_OFFSET;
 719 }
 720 EXPORT_SYMBOL(iwl_get_free_ucode_key_index);
 721
 722 static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
 723 {
 724         int i, not_empty = 0;
 725         u8 buff[sizeof(struct iwl_wep_cmd) +
 726                 sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
 727         struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
 728         size_t cmd_size  = sizeof(struct iwl_wep_cmd);
 729         struct iwl_host_cmd cmd = {
 730                 .id = REPLY_WEPKEY,
 731                 .data = wep_cmd,
 732                 .flags = CMD_SYNC,
 733         };
 734
 735         might_sleep();
 736
 737         memset(wep_cmd, 0, cmd_size +
 738                         (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 739
 740         for (i = 0; i < WEP_KEYS_MAX ; i++) {
 741                 wep_cmd->key[i].key_index = i;
 742                 if (priv->wep_keys[i].key_size) {
 743                         wep_cmd->key[i].key_offset = i;
 744                         not_empty = 1;
 745                 } else {
 746                         wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
 747                 }
 748
 749                 wep_cmd->key[i].key_size = priv->wep_keys[i].key_size;
 750                 memcpy(&wep_cmd->key[i].key[3], priv->wep_keys[i].key,
 751                                 priv->wep_keys[i].key_size);
 752         }
 753
 754         wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
 755         wep_cmd->num_keys = WEP_KEYS_MAX;
 756
 757         cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
 758
 759         cmd.len = cmd_size;
 760
 761         if (not_empty || send_if_empty)
 762                 return iwl_send_cmd(priv, &cmd);
 763         else
 764                 return 0;
 765 }
 766
 767 int iwl_restore_default_wep_keys(struct iwl_priv *priv)
 768 {
 769         WARN_ON(!mutex_is_locked(&priv->mutex));
 770
 771         return iwl_send_static_wepkey_cmd(priv, 0);
 772 }
 773 EXPORT_SYMBOL(iwl_restore_default_wep_keys);
 774
 775 int iwl_remove_default_wep_key(struct iwl_priv *priv,
 776                                struct ieee80211_key_conf *keyconf)
 777 {
 778         int ret;
 779
 780         WARN_ON(!mutex_is_locked(&priv->mutex));
 781
 782         IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
 783                       keyconf->keyidx);
 784
 785         memset(&priv->wep_keys[keyconf->keyidx], 0, sizeof(priv->wep_keys[0]));
 786         if (iwl_is_rfkill(priv)) {
 787                 IWL_DEBUG_WEP(priv, "Not sending REPLY_WEPKEY command due to RFKILL.\n");
 788                 /* but keys in device are clear anyway so return success */
 789                 return 0;
 790         }
 791         ret = iwl_send_static_wepkey_cmd(priv, 1);
 792         IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
 793                       keyconf->keyidx, ret);
 794
 795         return ret;
 796 }
 797 EXPORT_SYMBOL(iwl_remove_default_wep_key);
 798
 799 int iwl_set_default_wep_key(struct iwl_priv *priv,
 800                             struct ieee80211_key_conf *keyconf)
 801 {
 802         int ret;
 803
 804         WARN_ON(!mutex_is_locked(&priv->mutex));
 805
 806         if (keyconf->keylen != WEP_KEY_LEN_128 &&
 807             keyconf->keylen != WEP_KEY_LEN_64) {
 808                 IWL_DEBUG_WEP(priv, "Bad WEP key length %d\n", keyconf->keylen);
 809                 return -EINVAL;
 810         }
 811
 812         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 813         keyconf->hw_key_idx = HW_KEY_DEFAULT;
 814         priv->stations[IWL_AP_ID].keyinfo.alg = ALG_WEP;
 815
 816         priv->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
 817         memcpy(&priv->wep_keys[keyconf->keyidx].key, &keyconf->key,
 818                                                         keyconf->keylen);
 819
 820         ret = iwl_send_static_wepkey_cmd(priv, 0);
 821         IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
 822                 keyconf->keylen, keyconf->keyidx, ret);
 823
 824         return ret;
 825 }
 826 EXPORT_SYMBOL(iwl_set_default_wep_key);
 827
 828 static int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
 829                                 struct ieee80211_key_conf *keyconf,
 830                                 u8 sta_id)
 831 {
 832         unsigned long flags;
 833         __le16 key_flags = 0;
 834         int ret;
 835
 836         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 837
 838         key_flags |= (STA_KEY_FLG_WEP | STA_KEY_FLG_MAP_KEY_MSK);
 839         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 840         key_flags &= ~STA_KEY_FLG_INVALID;
 841
 842         if (keyconf->keylen == WEP_KEY_LEN_128)
 843                 key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
 844
 845         if (sta_id == priv->hw_params.bcast_sta_id)
 846                 key_flags |= STA_KEY_MULTICAST_MSK;
 847
 848         spin_lock_irqsave(&priv->sta_lock, flags);
 849
 850         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 851         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 852         priv->stations[sta_id].keyinfo.keyidx = keyconf->keyidx;
 853
 854         memcpy(priv->stations[sta_id].keyinfo.key,
 855                                 keyconf->key, keyconf->keylen);
 856
 857         memcpy(&priv->stations[sta_id].sta.key.key[3],
 858                                 keyconf->key, keyconf->keylen);
 859
 860         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 861                         == STA_KEY_FLG_NO_ENC)
 862                 priv->stations[sta_id].sta.key.key_offset =
 863                                  iwl_get_free_ucode_key_index(priv);
 864         /* else, we are overriding an existing key => no need to allocated room
 865          * in uCode. */
 866
 867         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 868                 "no space for a new key");
 869
 870         priv->stations[sta_id].sta.key.key_flags = key_flags;
 871         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 872         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 873
 874         ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
 875
 876         spin_unlock_irqrestore(&priv->sta_lock, flags);
 877
 878         return ret;
 879 }
 880
 881 static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
 882                                    struct ieee80211_key_conf *keyconf,
 883                                    u8 sta_id)
 884 {
 885         unsigned long flags;
 886         __le16 key_flags = 0;
 887         int ret;
 888
 889         key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
 890         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 891         key_flags &= ~STA_KEY_FLG_INVALID;
 892
 893         if (sta_id == priv->hw_params.bcast_sta_id)
 894                 key_flags |= STA_KEY_MULTICAST_MSK;
 895
 896         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 897
 898         spin_lock_irqsave(&priv->sta_lock, flags);
 899         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 900         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 901
 902         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
 903                keyconf->keylen);
 904
 905         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
 906                keyconf->keylen);
 907
 908         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 909                         == STA_KEY_FLG_NO_ENC)
 910                 priv->stations[sta_id].sta.key.key_offset =
 911                                  iwl_get_free_ucode_key_index(priv);
 912         /* else, we are overriding an existing key => no need to allocated room
 913          * in uCode. */
 914
 915         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 916                 "no space for a new key");
 917
 918         priv->stations[sta_id].sta.key.key_flags = key_flags;
 919         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 920         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 921
 922         ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
 923
 924         spin_unlock_irqrestore(&priv->sta_lock, flags);
 925
 926         return ret;
 927 }
 928
 929 static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
 930                                    struct ieee80211_key_conf *keyconf,
 931                                    u8 sta_id)
 932 {
 933         unsigned long flags;
 934         int ret = 0;
 935         __le16 key_flags = 0;
 936
 937         key_flags |= (STA_KEY_FLG_TKIP | STA_KEY_FLG_MAP_KEY_MSK);
 938         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 939         key_flags &= ~STA_KEY_FLG_INVALID;
 940
 941         if (sta_id == priv->hw_params.bcast_sta_id)
 942                 key_flags |= STA_KEY_MULTICAST_MSK;
 943
 944         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 945         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 946
 947         spin_lock_irqsave(&priv->sta_lock, flags);
 948
 949         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 950         priv->stations[sta_id].keyinfo.keylen = 16;
 951
 952         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 953                         == STA_KEY_FLG_NO_ENC)
 954                 priv->stations[sta_id].sta.key.key_offset =
 955                                  iwl_get_free_ucode_key_index(priv);
 956         /* else, we are overriding an existing key => no need to allocated room
 957          * in uCode. */
 958
 959         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 960                 "no space for a new key");
 961
 962         priv->stations[sta_id].sta.key.key_flags = key_flags;
 963
 964
 965         /* This copy is acutally not needed: we get the key with each TX */
 966         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key, 16);
 967
 968         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key, 16);
 969
 970         spin_unlock_irqrestore(&priv->sta_lock, flags);
 971
 972         return ret;
 973 }
 974
 975 void iwl_update_tkip_key(struct iwl_priv *priv,
 976                         struct ieee80211_key_conf *keyconf,
 977                         struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
 978 {
 979         u8 sta_id;
 980         unsigned long flags;
 981         int i;
 982
 983         if (iwl_scan_cancel(priv)) {
 984                 /* cancel scan failed, just live w/ bad key and rely
 985                    briefly on SW decryption */
 986                 return;
 987         }
 988
 989         sta_id = iwl_sta_id_or_broadcast(priv, sta);
 990         if (sta_id == IWL_INVALID_STATION)
 991                 return;
 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         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1281         spin_unlock_irqrestore(&priv->sta_lock, flags);
1282 }
1283 EXPORT_SYMBOL(iwl_sta_tx_modify_enable_tid);
1284
1285 int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
1286                          int tid, u16 ssn)
1287 {
1288         unsigned long flags;
1289         int sta_id;
1290
1291         sta_id = iwl_sta_id(sta);
1292         if (sta_id == IWL_INVALID_STATION)
1293                 return -ENXIO;
1294
1295         spin_lock_irqsave(&priv->sta_lock, flags);
1296         priv->stations[sta_id].sta.station_flags_msk = 0;
1297         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
1298         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
1299         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
1300         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1301         spin_unlock_irqrestore(&priv->sta_lock, flags);
1302
1303         return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
1304                                 CMD_ASYNC);
1305 }
1306 EXPORT_SYMBOL(iwl_sta_rx_agg_start);
1307
1308 int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
1309                         int tid)
1310 {
1311         unsigned long flags;
1312         int sta_id, ret;
1313
1314         sta_id = iwl_sta_id(sta);
1315         if (sta_id == IWL_INVALID_STATION) {
1316                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1317                 return -ENXIO;
1318         }
1319
1320         spin_lock_irqsave(&priv->sta_lock, flags);
1321         priv->stations[sta_id].sta.station_flags_msk = 0;
1322         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
1323         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
1324         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1325         ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1326         spin_unlock_irqrestore(&priv->sta_lock, flags);
1327
1328         return ret;
1329
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         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1344         spin_unlock_irqrestore(&priv->sta_lock, flags);
1345
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         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1361         spin_unlock_irqrestore(&priv->sta_lock, flags);
1362
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);